CN114814644B - Power battery system external short circuit test method, device and electronic equipment - Google Patents
Power battery system external short circuit test method, device and electronic equipment Download PDFInfo
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- CN114814644B CN114814644B CN202210639612.XA CN202210639612A CN114814644B CN 114814644 B CN114814644 B CN 114814644B CN 202210639612 A CN202210639612 A CN 202210639612A CN 114814644 B CN114814644 B CN 114814644B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention provides a method, a device and electronic equipment for testing external short circuits of a power battery system, which comprise the steps of receiving a test instruction, obtaining the current test temperature and the electric quantity of the power battery system to be tested based on the test instruction, judging whether the test temperature reaches a preset temperature value, judging whether the electric quantity of the power battery system to be tested is a preset value, if the test temperature is the preset temperature value and the electric quantity of the power battery system to be tested is the preset value, respectively carrying out short circuit test on a plurality of high-voltage connectors of the power battery system to be tested, and stopping short circuit test when the power battery system to be tested meets a preset end condition, so as to obtain a test result. The invention can cover more potential safety hazard conditions possibly existing, and further ensures the safety of the new energy automobile.
Description
Technical Field
The present invention relates to the field of power battery systems, and in particular, to a method and an apparatus for testing an external short circuit of a power battery system, and an electronic device.
Background
Along with the development of diversification of new energy automobiles, the power requirements are larger and larger, the performance requirements of power batteries are also more and more diversified, and the requirements on charge and discharge multiplying power are also higher and higher, so that the difference of internal resistances of the batteries in different electric quantity states is caused to be larger and larger, and the difference of short circuit currents in different electric quantity states is caused to be larger and larger. The rated current of the main insurance configured with large power requirement of the battery pack is larger and larger, the fusing protection time is also prolonged when smaller short-circuit current is generated, and the protection failure of the relay in the battery pack, the high-voltage wire harness and the electric devices in the high-voltage loop possibly occurs when the minimum short-circuit current exists, so that the whole vehicle safety risk is caused. The existing external short-circuit protection test conditions only agree that the short-circuit resistance is not more than 5mΩ and the temperature is 20 ℃ plus or minus 10 ℃, the constraint conditions are fewer, the state of the whole vehicle in the using process cannot be covered completely, meanwhile, because the path of the short-circuit current has no prejudgement, fault risk points can be omitted during the test, and the protection failure risk exists in the actual using process of the whole vehicle. In summary, the existing external short circuit test method cannot perform comprehensive test, and the new energy automobile still has potential safety hazards.
Disclosure of Invention
In view of the above, the invention aims to provide a method and a device for testing external short circuit of a power battery system and electronic equipment, which can cover more potential safety hazard conditions and further ensure the safety of a new energy automobile.
In order to achieve the above object, the technical scheme adopted by the embodiment of the invention is as follows:
In a first aspect, an embodiment of the present invention provides a method for testing an external short circuit of a power battery system, where the method includes receiving a test instruction, obtaining a current test temperature and an electric quantity of the power battery system to be tested based on the test instruction, determining whether the test temperature reaches a preset temperature value, determining whether the electric quantity of the power battery system to be tested is a preset value, if the test temperature is the preset temperature value and the electric quantity of the power battery system to be tested is the preset value, respectively performing a short circuit test on a plurality of high-voltage connectors of the power battery system to be tested, and stopping the short circuit test when the power battery system to be tested meets a preset end condition, to obtain a test result.
In one embodiment, before the short circuit test is performed on the plurality of high-voltage connectors of the power battery system to be tested, the method further comprises the steps of obtaining state information of the contactors of the charging circuit and the discharging circuit in the power battery system to be tested, judging whether the contactors of the charging circuit and the discharging circuit in the power battery system to be tested are closed, receiving a control instruction if the contactors of the charging circuit and the discharging circuit in the power battery system to be tested are not closed, and closing the contactors of the charging circuit and the discharging circuit in the power battery system to be tested based on the control instruction.
In one embodiment, the step of respectively performing short circuit testing on a plurality of high voltage connectors of the power battery system to be tested comprises the step of performing short circuit testing on any high voltage connector by connecting positive terminals and negative terminals of the high voltage connectors through cables, wherein the internal resistance of the cables is less than or equal to 5mΩ.
In one embodiment, when the power battery system to be tested meets a preset end condition, stopping the short circuit test to obtain a test result, wherein the step of receiving a first detection instruction, detecting a protection device of the power battery system to be tested based on the first detection instruction, and obtaining state information of the protection device; judging whether the protection device is fused or not based on the state information of the protection device, and stopping the short circuit test if the protection device is fused, so as to obtain a test result.
In one embodiment, when the power battery system to be tested meets a preset end condition, stopping the short circuit test to obtain a test result, wherein the short circuit test is stopped after the high-voltage connector is continuously short-circuited for a first preset time to obtain the test result.
In one embodiment, after stopping the short circuit test, the method further comprises placing the power cell system to be tested at the test temperature for a second preset time.
In one embodiment, the preset value of the electric quantity of the power battery system to be tested at least comprises an electric quantity value corresponding to the minimum short-circuit current and an electric quantity value corresponding to the maximum short-circuit current of the power battery system to be tested.
The embodiment of the invention provides an external short circuit testing device of a power battery system, which comprises an instruction receiving module, a judging module, a testing module and a stopping module, wherein the instruction receiving module is used for receiving a testing instruction and acquiring the current testing temperature and the electric quantity of the power battery system to be tested based on the testing instruction, the judging module is used for judging whether the testing temperature reaches a preset temperature value and judging whether the electric quantity of the power battery system to be tested is a preset value, the testing module is used for respectively carrying out short circuit testing on a plurality of high-voltage connectors of the power battery system to be tested if the testing temperature is the preset temperature value and the electric quantity of the power battery system to be tested is the preset value, and the stopping module is used for stopping the short circuit testing when the power battery system to be tested meets a preset end condition to obtain a testing result.
In a third aspect, an embodiment of the present invention provides an electronic device comprising a processor and a memory storing computer executable instructions executable by the processor to perform the steps of the method of any one of the first aspects described above.
In a fourth aspect, embodiments of the present invention provide a computer readable storage medium having a computer program stored thereon, which when executed by a processor performs the steps of the method of any of the first aspects provided above.
The embodiment of the invention has the following beneficial effects:
The external short circuit test method, the external short circuit test device and the electronic equipment for the power battery system are characterized by comprising the steps of firstly receiving a test instruction, obtaining the current test temperature and the electric quantity of the power battery system to be tested based on the test instruction, then judging whether the test temperature reaches a preset temperature value, judging whether the electric quantity of the power battery system to be tested is a preset value, if the test temperature is the preset temperature value and the electric quantity of the power battery system to be tested is the preset value, respectively carrying out short circuit test on a plurality of high-voltage connectors of the power battery system to be tested, and finally stopping short circuit test when the power battery system to be tested meets a preset end condition, and obtaining a test result. The method is used for respectively testing a plurality of high-voltage connectors of the power battery system to be tested, and can verify potential safety hazards of each output branch caused by different design schemes, so that more potential safety hazard conditions are covered, and the safety of a new energy automobile is further ensured.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
In order to make the above objects, features and advantages of the present invention more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of a method for testing external short circuit of a power battery system according to an embodiment of the present invention;
Fig. 2 is a schematic diagram of a power battery system according to an embodiment of the present invention;
Fig. 3 is a schematic structural diagram of an external short circuit testing device for a power battery system according to an embodiment of the present invention;
Fig. 4 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Meanwhile, because the path of the short-circuit current has no prejudgement property, but no short-circuit path test point is appointed in the existing requirements, the partial vehicle type battery pack at the present stage can be provided with a high-voltage loop for outputting a low-power electric device, if the short-circuit path is not restrained, a fault risk point can be omitted during the test, and the actual use process of the whole vehicle has protection failure risk. In summary, the existing external short circuit test method cannot perform comprehensive test, and the new energy automobile still has potential safety hazards.
Based on the above, the external short circuit test method and device for the power battery system and the electronic equipment provided by the embodiment of the invention can cover more potential safety hazard conditions possibly existing, and further ensure the safety of the new energy automobile.
For the convenience of understanding the present embodiment, first, a detailed description will be given of a method for testing an external short circuit of a power battery system disclosed in the present embodiment, referring to a flowchart of a method for testing an external short circuit of a power battery system shown in fig. 1, which mainly includes the following steps S101 to S104:
and step S101, receiving a test instruction, and acquiring the current test temperature and the electric quantity of the power battery system to be tested based on the test instruction.
In one embodiment, the test temperature for the external short circuit test and the power of the power battery system to be tested are constrained, and the test is performed when the test temperature and the power of the power battery system to be tested meet the conditions. Based on the above, in the embodiment of the invention, after receiving the test instruction sent by the tester, the current test temperature needs to be collected first, and the electric quantity of the power battery system to be tested needs to be read.
Step S102, judging whether the test temperature reaches a preset temperature value or not, and judging whether the electric quantity of the power battery system to be tested is a preset value or not.
In one embodiment, the test temperature may be compared with a preset temperature value, the power of the power battery system to be tested may be compared with a preset value, whether the test temperature reaches the preset temperature value may be determined, and whether the power of the power battery system to be tested may be determined as the preset value. Specifically, the preset temperature value may be 20±10 ℃, and the preset value of the electric quantity of the power battery system to be tested at least includes an electric quantity value corresponding to the minimum short-circuit current and an electric quantity value corresponding to the maximum short-circuit current of the power battery system to be tested, such as a maximum short-circuit current 5500a@soc99%, and a minimum short-circuit current 2000a@soc10%.
And step 103, if the test temperature is a preset temperature value and the electric quantity of the power battery system to be tested is a preset value, respectively carrying out short circuit test on a plurality of high-voltage connectors of the power battery system to be tested.
In one embodiment, if the test temperature is a preset temperature value and the electric quantity of the power battery system to be tested is a preset value, that is, the constraint condition of the test is satisfied, the short circuit test may be performed on the plurality of high voltage connectors of the power battery system to be tested, respectively.
Referring to the schematic architecture of a power cell system shown in fig. 2, the power cell system includes a precursor arm (point a to precursor high voltage connector), a fast charge arm (point B to fast charge high voltage connector), and a rear drive arm (point C to rear drive high voltage connector). In order to cover and verify the potential safety hazard of each output branch caused by different design schemes, safety accidents such as relay adhesion, wire harness ablation and the like caused by design selection are avoided. In this embodiment, short-circuit tests can be performed on three branches respectively, and multiple tests are performed to ensure that the positive terminal and the negative terminal on each high-voltage connector are subjected to external short-circuit tests. Specifically, for any high-voltage connector, a short circuit test can be performed by connecting the positive terminal and the negative terminal of the high-voltage connector through a cable, wherein the internal resistance of the cable is less than or equal to 5mΩ.
And step S104, stopping the short circuit test when the power battery system to be tested meets the preset end condition, and obtaining a test result.
In one embodiment, the short-circuit state is maintained until any one of the conditions such as the fusing time of the fuse, the smoking time of the high-voltage wire harness of each branch and the like is met, namely, 1) the protection function of the power battery system to be tested is enabled and the short-circuit current is stopped, 2) after the temperature of the shell of the power battery system to be tested is stable (the temperature change is less than 4 ℃ within 2 h), the short-circuit is continued for at least 1h, and then the test result is obtained.
The external short circuit testing method for the power battery system provided by the embodiment of the invention restrains the electric quantity of the power battery system to be tested in the testing process, detects the electric quantity of the power battery system to be tested in different electric quantities, and is more in line with the state in the actual use process of the whole vehicle.
To indicate that the external short circuit test is performed in a drivable mode as well as in a mode allowing external charging, the relevant main contactors for charging and discharging may be closed at the start of the test. Specifically, before short-circuit testing is performed on a plurality of high-voltage connectors of a power battery system to be tested, relevant main contactors for charging and discharging can be closed, including, but not limited to, firstly, state information of the contactors of a charging circuit and a discharging circuit in the power battery system to be tested is obtained, then whether the contactors of the charging circuit and the discharging circuit in the power battery system to be tested are closed is judged, finally, if the contactors of the charging circuit and the discharging circuit in the power battery system to be tested are not closed, a control instruction is received, and based on the control instruction, the contactors of the charging circuit and the discharging circuit in the power battery system to be tested are closed.
With the above method, if the driving mode and the mode allowing external charging cannot be realized in a single test, two or more tests may be performed.
In order to facilitate understanding, the embodiment of the invention further provides a specific implementation manner for stopping the short circuit test, which specifically comprises the following two steps:
The method comprises the steps of firstly, receiving a first detection instruction, detecting a protection device of a power battery system to be tested based on the first detection instruction, obtaining state information of the protection device, then judging whether the protection device is fused based on the state information of the protection device, and finally stopping short circuit test if the protection device is fused, so as to obtain a test result.
In one embodiment, a tester may issue a first detection instruction during a test process, where the first detection instruction is used to detect a protection device (such as a fuse) of a power battery system to be tested, and obtain state information of the protection device, and when the protection device plays a role in protection, that is, when the fuse is blown, the short-circuit current is terminated, and the short-circuit test is stopped, so as to obtain a test result.
The second mode comprises the steps of firstly receiving a second detection instruction, detecting the shell temperature of the power battery system to be tested based on the second detection instruction, then judging whether the shell temperature of the power battery system to be tested meets the preset temperature condition, and finally stopping the short circuit test after continuously short-circuiting the high-voltage connector for a first preset time if the shell temperature of the power battery system to be tested meets the preset temperature condition, so as to obtain a test result.
In one embodiment, the tester may issue a second detection instruction during the test, where the second detection instruction is used to detect the housing temperature of the power battery system to be tested, and when the housing temperature of the power battery system to be tested meets a preset temperature condition, the short circuit test is stopped after the high-voltage connector is continuously shorted for a first preset time, that is, after the change of the housing temperature of the power battery system to be tested is less than 4 ℃ within 2 hours, and the short circuit test is continued for at least 1 hour, so as to obtain a test result.
It should be noted that, in the above two modes, only one of them needs to be satisfied to end the short circuit test.
Further, after stopping the short circuit test, the power cell system to be tested needs to be placed at the test temperature for a second preset time. Specifically, the power battery system to be tested can be placed for 1h at the test temperature, the state of the power battery system to be tested is observed, and if the power battery system to be tested has no leakage, shell rupture, fire or explosion phenomenon, and meanwhile, the insulation resistance after the test is not less than 100 Ω/V, the power battery system to be tested is indicated to have no potential safety hazard.
According to the method provided by the embodiment of the invention, the testing method is improved, the SOC state (namely the electric quantity) of a test object (namely the power battery system to be tested) is restrained, and external short circuit tests are required to be carried out on the positive electrode terminal and the negative electrode terminal of all the high-voltage connectors, so that more possible potential safety hazard conditions are covered, and the safety of a new energy automobile is further ensured.
In order to facilitate understanding, the embodiment of the invention also provides a specific external short circuit test method for the power battery system, which refers to the power parameters of the driving part of the pure electric vehicle with the 350V voltage platform shown in the table 1, namely the design parameters which need to be met by all parts of the power battery system.
Table 1 power parameters of pure electric vehicle driving parts with 350V voltage platform
Further, according to the power parameters of the driving component, the design, development and model selection are carried out, and the model selection of the framework component is as follows:
1. the rated voltage of the main fuse is 500V, and the rated current is 700A;
2. the cable cross section of the precursor branch (from the point A to the precursor high-voltage connector) is 50mm 2;
3. The cable cross section of the quick charge and drive branch (from the point B to the quick charge high-voltage connector) is 35mm 2;
4. the cross section area of the cable of the rear drive branch (from the point C to the rear drive high-voltage connector) is 70mm 2;
5. The main positive main negative relay has rated voltage of 500V and rated current of 300A.
With the power battery system as a test object, first, test conditions are determined before starting a test:
(a) The test should be conducted at an ambient temperature of 20 ± 10 ℃ or at an ambient temperature agreed upon in the manufacturer's specifications;
(b) When the test starts, determining that all protection devices which influence the test object function and are related to the test result are in a normal running state;
(c) The manufacturer should submit a fuse selection check report containing fuses, contactors, connectors, cable tolerance and protection curves.
Next, an external short circuit test is started, mainly comprising the following (a) - (c):
(a) At the beginning of the test, the relevant main contactors for both charging and discharging should be closed, thus representing a drivable mode and a mode allowing external charging, if not completed in a single test, two or more tests should be performed;
(b) The positive terminal and the negative terminal of the test object are connected with each other, if the power battery system is provided with a plurality of high-voltage connector output ports, a plurality of tests are carried out, so that the positive terminal and the negative terminal on each high-voltage output connector can be subjected to external short circuit test, and the internal resistance of an external short circuit cable is not more than 5mΩ;
(c) The power of the power battery system should be at least 2 different SOC values during the test. Specifically, the SOC value at the minimum short-circuit current and the SOC value at the maximum short-circuit current may be selected according to the fuse check report submitted by the manufacturer.
The method comprises the steps of (a) step of (a) carrying out a test on the safety risk hidden danger of each output branch caused by different design schemes, and (b) step of (b) carrying out a test on the safety risk hidden danger of each output branch caused by different design schemes, wherein the safety accidents such as relay adhesion, wire harness ablation and the like caused by design and type selection can be safely avoided by the method, and (c) step of (b) carrying out a test on the safety risk hidden danger of the electric automobile when the minimum short-circuit current and the maximum short-circuit current are generated.
Then, the short-circuit state is maintained until any one of the following conditions is satisfied, and the test is ended:
(a) The test works on the protection function of the image and terminates the short-circuit current;
(b) After the test pair image housing temperature stabilizes (temperature change is less than 4 ℃ in 2 h), the short circuit is continued for at least 1h.
Finally, after completion of the above test steps, the test subjects were observed at the test ambient temperature for 1h. If the test object has no leakage, shell rupture, fire or explosion phenomenon, the insulation resistance after the test is not less than 100 ohm/V, and the test object has no potential safety hazard.
Further, after each branch is subjected to short circuit test, the following test results can be obtained, and the specific performance parameters of the power battery system architecture component are as follows:
1. The maximum short-circuit current of the power battery system is 5500A@SOC99%, and the minimum short-circuit current is 2000A@SOC10%.
2. The rated voltage of the main fuse is 500V, and the rated current is 700A;
According to the characteristics of the fuse, the fusing time is 28S when the short-circuit current is 2000A, and the fusing time is 0.02S when the short-circuit current is 5500A;
3. The cable cross section of the precursor branch (from the point A to the precursor high-voltage connector) is 50mm <2 >;
according to the characteristics of the high-voltage wire harness, the smoke time is 33S when the short-circuit current of the high-voltage wire harness is 2000A, and the smoke time is 5.63S when the short-circuit current is 5500A;
4. the cable cross section of the quick charge and drive branch (from the point B to the quick charge high-voltage connector) is 35mm < 2 >;
According to the characteristics of the high-voltage wire harness, the smoke time is 16S when the short-circuit current of the high-voltage wire harness is 2000A, and the smoke time is 2.36S when the short-circuit current is 5500A;
5. the cross section area of the cable of the rear drive branch (from the point C to the rear drive high-voltage connector) is 70mm <2 >;
according to the characteristics of the high-voltage wire harness, the smoke time is 67S when the high-voltage wire harness is short-circuited at the current of 2000A, and the smoke time is 10.7S when the short-circuited at the current of 5500A;
6. Main positive main negative relay rated voltage 500V, rated current 300A
According to the relay characteristics, relay adhesion is caused when the short circuit current 2000A lasts for 9S, and the short circuit current 5500A lasts for 0.5S;
in summary, as the power requirement of the whole vehicle is improved, the rated current value of the main fuse is also larger and larger when the power requirement of the whole vehicle is improved, and two dangerous points are that 1, when the minimum short-circuit current 2000A appears in the battery pack, the fusing protection time of the main fuse is 28S which is far longer than the adhesion duration 9S of the relay, the relay cannot be protected, and the relay is damaged. 2. When the battery pack has the minimum short-circuit current 2000A, the fusing protection time of the main fuse is 28S which is far longer than the smoking time 16S of the high-voltage wire harness of the quick charging branch, the high-voltage wire harness of the quick charging branch cannot be protected, and a fire event of the power battery pack can be caused. Accordingly, the configuration component type of the power battery system may be modified based on the test results.
The method provided by the embodiment of the invention has the advantages that the condition convention is carried out on the short circuit test according to the actual use state of the whole vehicle, the possible minimum short circuit current and the possible maximum short circuit current of the whole vehicle can be safely detected, the method can be more in line with the actual use state of the whole vehicle, and the coverage of the external short circuit test method is wider.
It should be noted that any particular values in all examples shown and described herein are to be construed as merely illustrative and not limitative, and thus other examples of exemplary embodiments may have different values.
For the method for testing an external short circuit of a power battery system provided in the foregoing embodiment, the embodiment of the present invention further provides a device for testing an external short circuit of a power battery system, referring to a schematic structural diagram of the device for testing an external short circuit of a power battery system shown in fig. 3, the device may include the following parts:
The instruction receiving module 301 is configured to receive a test instruction, and obtain a current test temperature and an electric quantity of the power battery system to be tested based on the test instruction.
The determining module 302 is configured to determine whether the test temperature reaches a preset temperature value, and determine whether the electric quantity of the power battery system to be tested is a preset value.
And the test module 303 is configured to perform a short circuit test on the plurality of high voltage connectors of the power battery system to be tested if the test temperature is a preset temperature value and the electric quantity of the power battery system to be tested is a preset value.
And the stopping module 304 is configured to stop the short circuit test when the power battery system to be tested meets a preset end condition, and obtain a test result.
The external short circuit testing device for the power battery system provided by the embodiment of the invention is used for restraining the electric quantity of the power battery system to be tested in the testing process and detecting the electric quantity of the power battery system to be tested in different electric quantities, and is more in line with the state in the actual use process of the whole vehicle.
In one embodiment, the device further comprises a control module, wherein the control module is used for acquiring state information of the contactors of the charging circuit and the discharging circuit in the power battery system to be tested, judging whether the contactors of the charging circuit and the discharging circuit in the power battery system to be tested are closed, receiving a control instruction if the contactors of the charging circuit and the discharging circuit in the power battery system to be tested are not closed, and closing the contactors of the charging circuit and the discharging circuit in the power battery system to be tested based on the control instruction.
In one embodiment, the test module 303 is further configured to perform a short circuit test on any high voltage connector by connecting a positive terminal and a negative terminal of the high voltage connector with a cable, where the internal resistance of the cable is less than or equal to 5mΩ.
In one embodiment, the stopping module 304 is further configured to receive a first detection instruction, detect a protection device of the power battery system to be tested based on the first detection instruction, obtain state information of the protection device, determine whether the protection device is fused based on the state information of the protection device, and stop the short circuit test if the protection device is fused, so as to obtain a test result.
In one embodiment, the stopping module 304 is further configured to receive a second detection instruction, detect a housing temperature of the power battery system to be tested based on the second detection instruction, determine whether the housing temperature of the power battery system to be tested meets a preset temperature condition, and stop the short circuit test after continuously short-circuiting the high voltage connector for a first preset time if the housing temperature of the power battery system to be tested meets the preset temperature condition, so as to obtain a test result.
In one embodiment, the stopping module 304 is further configured to place the power cell system to be tested at the test temperature for a second predetermined time.
In one embodiment, the preset value of the electric quantity of the power battery system to be tested at least comprises an electric quantity value corresponding to the minimum short-circuit current and an electric quantity value corresponding to the maximum short-circuit current of the power battery system to be tested.
The device provided by the embodiment of the present invention has the same implementation principle and technical effects as those of the foregoing method embodiment, and for the sake of brevity, reference may be made to the corresponding content in the foregoing method embodiment where the device embodiment is not mentioned.
The embodiment of the invention also provides electronic equipment, in particular to the electronic equipment, which comprises a processor and a storage device, wherein the storage device is stored with a computer program which executes the method of any one of the embodiments when being run by the processor.
Fig. 4 is a schematic structural diagram of an electronic device according to an embodiment of the present invention, where the electronic device 100 includes a processor 400, a memory 401, a bus 402 and a communication interface 403, where the processor 400, the communication interface 403 and the memory 401 are connected by the bus 402, and the processor 400 is configured to execute executable modules, such as computer programs, stored in the memory 401.
The memory 401 may include a high-speed random access memory (RAM, random Access Memory), and may further include a non-volatile memory (non-volatile memory), such as at least one disk memory. The communication connection between the system network element and at least one other network element is implemented via at least one communication interface 403 (which may be wired or wireless), which may use the internet, a wide area network, a local network, a metropolitan area network, etc.
Bus 402 may be an ISA bus, a PCI bus, an EISA bus, or the like. The buses may be classified as address buses, data buses, control buses, etc. For ease of illustration, only one bi-directional arrow is shown in FIG. 4, but not only one bus or type of bus.
The memory 401 is configured to store a program, and the processor 400 executes the program after receiving an execution instruction, and a method executed by the apparatus for flow defining disclosed in any of the foregoing embodiments of the present invention may be applied to the processor 400 or implemented by the processor 400.
The processor 400 may be an integrated circuit chip with signal processing capabilities. In implementation, the steps of the above method may be performed by integrated logic circuits of hardware in the processor 400 or by instructions in the form of software. The processor 400 may be a general-purpose processor, including a central Processing unit (Central Processing Unit, CPU), a network processor (Network Processor, NP), a digital signal processor (DIGITAL SIGNAL Processing, DSP), an Application Specific Integrated Circuit (ASIC), a Field-Programmable GATE ARRAY (FPGA), a Programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component. The disclosed methods, steps, and logic blocks in the embodiments of the present invention may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present invention may be embodied directly in the execution of a hardware decoding processor, or in the execution of a combination of hardware and software modules in a decoding processor. The software modules may be located in a random access memory, flash memory, read only memory, programmable read only memory, or electrically erasable programmable memory, registers, etc. as well known in the art. The storage medium is located in the memory 401, and the processor 400 reads the information in the memory 401, and in combination with its hardware, performs the steps of the above method.
The computer program product of the readable storage medium provided by the embodiment of the present invention includes a computer readable storage medium storing a program code, where the program code includes instructions for executing the method described in the foregoing method embodiment, and the specific implementation may refer to the foregoing method embodiment and will not be described herein.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. The storage medium includes a U disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, an optical disk, or other various media capable of storing program codes.
It should be noted that the foregoing embodiments are merely illustrative embodiments of the present invention, and not restrictive, and the scope of the invention is not limited to the embodiments, and although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that any modification, variation or substitution of some of the technical features of the embodiments described in the foregoing embodiments may be easily contemplated within the scope of the present invention, and the spirit and scope of the technical solutions of the embodiments do not depart from the spirit and scope of the embodiments of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. A method for testing an external short circuit of a power battery system, comprising:
Receiving a test instruction, and acquiring the current test temperature and the electric quantity of the power battery system to be tested based on the test instruction;
Judging whether the test temperature reaches a preset temperature value or not, and judging whether the electric quantity of the power battery system to be tested is a preset value or not;
if the test temperature is a preset temperature value and the electric quantity of the power battery system to be tested is a preset value, respectively carrying out short circuit test on a plurality of high-voltage connectors of the power battery system to be tested;
Stopping the short circuit test when the power battery system to be tested meets a preset end condition, and obtaining a test result;
The method comprises the steps of receiving a first detection instruction, detecting a protection device of the power battery system to be tested based on the first detection instruction, obtaining state information of the protection device, judging whether the protection device is fused based on the state information of the protection device, and stopping the short circuit test if the protection device is fused to obtain a test result;
Stopping the short circuit test when the power battery system to be tested meets a preset end condition, and obtaining a test result, wherein the short circuit test comprises the steps of receiving a second detection instruction and detecting the shell temperature of the power battery system to be tested based on the second detection instruction; and if the shell temperature of the power battery system to be tested meets the preset temperature condition, stopping the short circuit test after continuously short-circuiting the high-voltage connector for a first preset time to obtain a test result.
2. The method of claim 1, further comprising, prior to respectively short-circuiting the plurality of high voltage connectors of the power cell system to be tested:
Acquiring state information of contactors of a charging loop and a discharging loop in the power battery system to be tested;
judging whether contactors of a charging loop and a discharging loop in the power battery system to be tested are closed or not;
and if the contactors of the charging circuit and the discharging circuit in the power battery system to be tested are not closed, receiving a control instruction, and closing the contactors of the charging circuit and the discharging circuit in the power battery system to be tested based on the control instruction.
3. The method of claim 1, wherein the step of respectively short-circuiting the plurality of high voltage connectors of the power cell system to be tested comprises:
and for any high-voltage connector, performing short circuit test by connecting the positive terminal and the negative terminal of the high-voltage connector through a cable, wherein the internal resistance of the cable is less than or equal to 5mΩ.
4. The method of claim 1, further comprising, after stopping the short circuit test:
And placing the power battery system to be tested at the test temperature for a second preset time.
5. The method of claim 1, wherein the predetermined value of the power cell system to be tested comprises at least a power value corresponding to a minimum short circuit current and a power value corresponding to a maximum short circuit current of the power cell system to be tested.
6. An external short circuit testing device for a power battery system, comprising:
The instruction receiving module is used for receiving a test instruction and acquiring the current test temperature and the electric quantity of the power battery system to be tested based on the test instruction;
The judging module is used for judging whether the test temperature reaches a preset temperature value or not and judging whether the electric quantity of the power battery system to be tested is a preset value or not;
The test module is used for respectively carrying out short circuit test on a plurality of high-voltage connectors of the power battery system to be tested if the test temperature is a preset temperature value and the electric quantity of the power battery system to be tested is a preset value;
The stopping module is used for stopping the short circuit test when the power battery system to be tested meets a preset ending condition to obtain a test result;
the stopping module is also used for receiving a first detection instruction, detecting a protection device of the power battery system to be tested based on the first detection instruction, obtaining state information of the protection device, judging whether the protection device is fused based on the state information of the protection device, stopping the short circuit test if the protection device is fused, and obtaining a test result;
The stopping module is further used for receiving a second detection instruction, detecting the shell temperature of the power battery system to be tested based on the second detection instruction, judging whether the shell temperature of the power battery system to be tested meets a preset temperature condition, and stopping the short circuit test after continuously short-circuiting the high-voltage connector for a first preset time if the shell temperature of the power battery system to be tested meets the preset temperature condition to obtain a test result.
7. An electronic device comprising a processor and a memory, the memory storing computer executable instructions executable by the processor, the processor executing the computer executable instructions to implement the steps of the method of any one of claims 1 to 5.
8. A computer readable storage medium having stored thereon a computer program, characterized in that the computer program when executed by a processor performs the steps of the method of any of the preceding claims 1 to 5.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110780226A (en) * | 2018-07-30 | 2020-02-11 | 广州小鹏汽车科技有限公司 | Battery pack internal short circuit detection method and device and electric automobile |
| CN113049971A (en) * | 2021-03-24 | 2021-06-29 | 国联汽车动力电池研究院有限责任公司 | Internal short-circuit current testing method and system for power battery |
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| JP4739040B2 (en) * | 2005-02-18 | 2011-08-03 | パナソニック株式会社 | Secondary battery internal short-circuit detection device, secondary battery internal short-circuit detection method, secondary battery pack and electronic device |
| KR102238559B1 (en) * | 2018-08-13 | 2021-04-09 | 삼성에스디아이 주식회사 | Battery control appratus and method for detection internal short of battery |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110780226A (en) * | 2018-07-30 | 2020-02-11 | 广州小鹏汽车科技有限公司 | Battery pack internal short circuit detection method and device and electric automobile |
| CN113049971A (en) * | 2021-03-24 | 2021-06-29 | 国联汽车动力电池研究院有限责任公司 | Internal short-circuit current testing method and system for power battery |
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