CN116794511A - Electric bicycle battery state detection system and method - Google Patents

Abstract

The invention discloses an electric bicycle battery status detection method, which includes: a battery management module detects battery status information of a battery module, and transmits the battery status information to a serial port to infrared module; the serial port to infrared module converts the numbers containing the battery status information The signal is loaded into the infrared signal and modulated into a pulse sequence of a specific frequency for transmission; the infrared receiving end of the mobile detection device receives the pulse sequence and demodulates it to obtain the battery status information; a battery status detection system using this method is also disclosed, including Battery module, communication connection serial port to infrared module and battery management module, connectors and mobile detection equipment. The invention is equipped with a serial port to infrared module in the battery pack, which transmits the battery status information detected in the battery management module to the mobile detection device through infrared signals. After the lead-acid battery is replaced with a lithium battery, it does not need to be disassembled at a lower cost. You can easily obtain battery status information by opening the battery pack.

Description

An electric bicycle battery status detection system and method

Technical field

The present invention relates to the technical field of battery detection, and in particular to an electric bicycle battery status detection system and method.

Background technique

Electric bicycles are quite common in China. The current number of electric bicycles reaches 300 million units, and the annual output is more than 30 million units. In the past, electric bicycles basically used low-performance, polluting but cheap lead-acid batteries. With the decline in the cost of lithium batteries and the standardization of the definition of electric bicycles in the new national standard, many electric bicycles defined as light electric bicycles need to be eliminated in advance, and large-scale The replacement of lead-acid batteries with lithium batteries has also gradually begun. There are two main methods of lithium battery packs on the market: conventional hardware protection and software protection. Many users, after replacing their original electric bicycles with lead-acid batteries with lithium batteries, will encounter problems because the battery connectors are still the original national standard. Because the interface is inconsistent or the protocol does not match, it is impossible to use software to protect the battery pack. It is necessary to add a detection port and an external transfer harness before using software to protect the battery pack to obtain battery status information. For ordinary hardware protection battery packs, Because of the difficulty in battery status detection, the battery pack needs to be disassembled during after-sales and routine testing to obtain battery status information, which is inconvenient to operate.

"A lead-acid battery condition monitor for electric vehicles" disclosed in Chinese patent documents, its publication number is CN206742444U, and the publication date is 2017-12-12. The monitor uses a single-chip microcomputer as the core microcontroller of the main control board System, the intelligent battery monitoring chip serves as the core measurement component of the modular data acquisition board. Under the unified control of the main control board, the modular data acquisition board dynamically measures the working data of each battery in the battery pack in real time. The modular data acquisition board measures The data is transmitted to the main control board through the optically isolated interface; this technology can monitor the voltage, current, temperature, charging capacity, discharge capacity and remaining capacity of each battery in real time, and can grasp the working status information of the battery pack in real time. However, this technology is still applied to lead-acid batteries, which correspond to national standard prefix connectors; however, after the lead-acid batteries in the battery pack are replaced with lithium batteries, the original national standard prefix connectors are used. In this case, the battery pack cannot provide a detection port due to mismatched interfaces. Therefore, it is necessary to add a detection port and an external adapter cable to increase the hardware cost, or to obtain battery status information after disassembling the battery pack.

Contents of the invention

The invention is to overcome the problem in the prior art that after replacing the lead-acid battery in the battery pack with a lithium battery, when using the original national standard prefix connector, it is necessary to add a detection port and an external adapter wire to increase the hardware cost or To solve the problem of obtaining battery status information only after disassembling the battery pack, an electric bicycle battery status detection system and method are provided. A serial port to infrared module is set up in the battery pack to transmit the battery status information detected in the battery management module through infrared. The signal is transmitted to the mobile detection device. After the lead-acid battery is replaced with a lithium battery, the battery status information can be easily obtained at a lower cost without disassembling the battery pack.

In order to achieve the above objects, the present invention adopts the following technical solutions:

An electric bicycle battery status detection system includes a battery module. One end of the battery module is connected to one end of the serial port to infrared module and the first interface of the connector. The other end of the battery module is connected to one end of the battery management module. The other end of the battery management module is connected to the other end of the serial port to infrared module and the second interface of the connector respectively; the serial port to infrared module is communicated with the battery management module; the serial port to infrared module is provided with an infrared transmitter, so The infrared transmitting end corresponds to the light guide on the battery pack shell; the detection system also includes a mobile detection device provided with an infrared receiving end.

The battery module in the present invention is mainly composed of lithium battery cells connected in series and parallel. The battery management module has a communication function and is responsible for communicating with the serial port to infrared module. The serial port to infrared module also has a communication function and receives battery status information by communicating with the battery management module. and then converted into infrared signals for output. The connectors are national standard prefix connectors; the battery management module, serial port to infrared module and battery module are installed inside the battery pack shell and fixed with screws, pressure plates or glue. The serial port to infrared converter The infrared transmitting end of the module is attached and fixed to the light guide on the battery pack shell, and the connector is installed on the battery shell through screws; therefore, it is only necessary to use the mobile detection device to read the serial port and convert the infrared module to send out through the light guide. Infrared signals can be used to obtain the desired battery status information without the need to disassemble the battery pack or add detection ports and external adapter cables.

Preferably, the serial port to infrared module is also connected to an infrared command receiving device, and the infrared command receiving device corresponds to the light guide; the movement detection device is also provided with an infrared command transmitting device, which sends a read signal to the infrared command receiving device. Infrared command for battery status information.

In the present invention, an infrared command receiving device is provided on the serial port to infrared module, and an infrared command transmitting device is provided on the mobile detection device. Therefore, an instruction to read the battery status information can be sent to the battery pack through the mobile detection device first, and then the battery pack can The battery management module inside transmits the battery status information to the serial port to infrared module, and then the serial port to infrared module sends infrared information containing the battery status information. The serial port to infrared module can be made to work when it needs to be read, without the need to continuously send infrared information. Save energy.

Preferably, the battery pack casing is provided with a label containing battery pack identification information, and the movement detection device is further provided with a label reading module to read the battery pack identification information in the label; or the battery management module The battery pack identification information is stored in the mobile detection device, and the mobile detection device receives the infrared information containing the battery pack identification information sent by the serial port to infrared module.

In the present invention, a mobile detection device will detect and obtain battery status information in a large number of battery packs within a period of time. Therefore, in order to facilitate the statistics and analysis of battery information, it is necessary to correspond one to one to each battery pack and its battery status information. ; In order to solve this problem, a label can be set on the battery pack casing, and the label contains unique battery pack identification information, so that the mobile detection device can determine the battery status information of which battery pack; the battery can also be directly The packet identification information is combined into the infrared information of the battery status information.

A method for detecting battery status of an electric bicycle, including:

The battery management module detects the battery status information of the battery module and transmits the battery status information to the serial port to infrared module; the serial port to infrared module loads the digital signal containing the battery status information into the infrared signal and modulates it into a pulse sequence of a specific frequency. emission;

The infrared receiving end of the mobile detection device receives the pulse sequence and demodulates it to obtain the battery status information.

In the present invention, the battery management module will continuously obtain battery status information while managing the battery modules in the battery pack. When it is necessary to obtain battery status information, the battery management module transmits this information to the serial port to infrared module through the communication connection harness. , and modulates the digital signal containing the battery status information into a pulse signal, which is emitted in the form of light pulses through the infrared transmitter, reaches the infrared receiver via the light guide, and is demodulated at the mobile detection device to obtain the battery status information. It is possible to avoid disassembling the battery pack or adding detection ports and external connection harnesses to obtain battery status information.

Preferably, the battery management module regularly detects the battery status information of the battery module and saves it;

The mobile detection equipment sends an infrared command to read the battery status information to the infrared command receiving device through the infrared command transmitting device;

After the battery management module detects the battery module again and updates the battery status information, it transmits the battery status information to the serial port to infrared module.

In the present invention, in order to avoid the problem of high energy consumption caused by the serial port to infrared module continuously transmitting infrared signals to the outside, an infrared command transmitting device and an infrared command receiving device are provided. When it is necessary to obtain battery status information through a mobile detection device, the infrared command transmitting device Send an infrared command to read the battery status information to the infrared command receiving device. After receiving the infrared command, the battery management module detects the battery module again and updates the battery status information and then transmits it to the serial port to infrared module, so that the serial port to infrared module starts to work. Emit infrared signals outward and stop working after the transmission is completed.

Preferably, before receiving the pulse sequence containing battery status information, the movement detection device first reads the battery pack identification information in the tag through the tag reading module, and corresponds the battery pack identification information to the battery status information; or movement detection The device demodulates the received pulse sequence to obtain the battery pack identification information and battery status information, and corresponds the battery pack identification information with the battery status information.

Before obtaining the battery status signal, the mobile detection device of the present invention can first read the battery pack identification information in the tag set on the battery pack shell through the tag reading module, and then compare the battery pack identification information with the battery status in the battery pack. The information corresponds to facilitate subsequent analysis and processing; the infrared signal emitted by the serial port to infrared module can also contain both battery status information and battery pack identification information, ultimately allowing the mobile detection equipment to detect and obtain a large amount of battery status information data correctly. Correlate each battery pack with its battery status information.

Preferably, the infrared command transmitting device sends an infrared command to read the battery status information to the infrared command receiving device, including the number of times n of repeated sending of the battery status information, so that the mobile detection device receives and demodulates to obtain n groups of numbers containing the battery status information. Signal;

Compare the data at the same position in n groups of digital signals, and use the data with the same rate exceeding the set ratio among all the data at the same position as the trusted data for that position, and combine them to obtain the final battery status information.

In the present invention, when the infrared command transmitting device sends an infrared command, in addition to the command for the serial port to infrared module to send the battery status information, it can also include the command for the number of times of repeated sending, so that the mobile detection device can obtain several sets of battery status information. data; it can avoid the problem of incomplete information reception caused by problems such as the infrared receiving end of the mobile detection device not aligning with the light guide when only one set of battery status information is transmitted; it can also be compared with the data of multiple sets of battery status information. , to avoid errors during infrared transmission and obtain more accurate battery status information.

The invention has the following beneficial effects: a serial port to infrared module is provided in the battery pack, and the battery status information detected in the battery management module is transmitted to the mobile detection device through infrared signals. After the lead-acid battery is replaced with a lithium battery, the At low cost, battery status information can be easily obtained without disassembling the battery pack; an infrared command receiving device is set up on the serial port to infrared module, and an infrared command transmitting device is set up on the mobile detection device. You can first send the battery status information into the battery pack through the mobile detection device. After the serial port to infrared module sends the instruction to read the battery status information, it then receives the infrared information containing the battery status information sent from the serial port to infrared module. There is no need to continuously send infrared information to save energy consumption.

Description of the drawings

Figure 1 is a schematic diagram of the battery status detection system in the present invention;

Figure 2 is a flow chart of the battery status detection method in the present invention;

Figure 3 is a schematic diagram of modulating a digital signal containing battery status information into a pulse sequence in the present invention;

In the picture: 1. Battery module; 2. Battery management module; 3. Serial port to infrared module; 4. Connector; 5. Light guide; 6. Mobile detection equipment; 7. Communication connection harness; 8. Battery case body; 31. Infrared transmitting end; 61. Infrared receiving end; 62. Display screen.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

Embodiment 1. As shown in Figure 1, an electric bicycle battery status detection system includes a battery module 1. One end of the battery module 1 is connected to one end of the serial port to infrared module 3 and the first interface of the connector 4. The battery The other end of the module 1 is connected to one end of the battery management module 2, and the other end of the battery management module 2 is connected to the other end of the serial port to infrared module 3 and the second interface of the connector 4; the serial port to infrared module 3 and the battery management module 2 They are connected through communication connection harness 7; the serial port to infrared module 3 is provided with an infrared transmitting end 31, and the infrared transmitting end 31 corresponds to the light guide 5 on the battery pack shell 8; the detection system also includes an infrared receiving end Movement detection device 6 for terminal 62 and display screen 62.

The battery module in the present invention is mainly composed of lithium battery cells connected in series and parallel. The battery management module has a communication function and is responsible for communicating with the serial port to infrared module. The serial port to infrared module also has a communication function and receives battery status information by communicating with the battery management module. and then converted into infrared signals for output. The connectors are national standard prefix connectors; the battery management module, serial port to infrared module and battery module are installed inside the battery pack shell and fixed with screws, pressure plates or glue. The serial port to infrared converter The infrared transmitting end of the module is attached and fixed to the light guide on the battery pack shell, and the connector is installed on the battery shell through screws; therefore, it is only necessary to use the mobile detection device to read the serial port and convert the infrared module to send out through the light guide. The desired battery status information can be obtained using infrared signals without the need to disassemble the battery pack or add detection ports and external adapter cables; the mobile detection device in the present invention can be a handheld detector.

As shown in Figure 2, a method for detecting the battery status of an electric bicycle includes:

The battery management module detects the battery status information of the battery module and transmits the battery status information to the serial port to infrared module; the serial port to infrared module loads the digital signal containing the battery status information into the infrared signal and modulates it into a pulse sequence of a specific frequency. emission;

The infrared receiving end of the mobile detection device receives the pulse sequence and demodulates it to obtain the battery status information.

In the present invention, the battery management module will continuously obtain battery status information while managing the battery modules in the battery pack. When it is necessary to obtain battery status information, the front end of the battery management module collects IC (such as SH367309U) to monitor the battery status information and It is transmitted to the main control IC (such as N32G455REL7) through I2C, and then the battery management module transmits this information to the serial port to infrared through the communication connection harness (such as 485A\485B) according to the specified communication protocol content (using TLL level standard or RS232 or RS485) In the module, the digital signal containing battery status information is modulated into a pulse signal of a specific frequency (such as 38kHz) and is emitted in the form of light pulses through the infrared transmitter. The specific modulation method is shown in Figure 3, which is an existing common technology. Without going into details, the pulse signal reaches the infrared receiving end through the light guide, and is demodulated at the mobile detection device to obtain battery status information. This avoids the need to disassemble the battery pack or add detection ports and external connection harnesses to obtain battery status information. .

In this embodiment, the battery status information may include battery power information, temperature information, cycle times, etc., in order to grasp the overall status of the battery. For the battery status information transmitted from the battery management module to the serial port to infrared module, it includes start mark, end mark and information data in the middle part, for example:

3A, is the start identifier, single byte, fixed value;

16, is the address identification, a single byte, representing the battery pack address code;

08, is a communication command, a single byte, representing the internal temperature command of the battery pack (see the communication command table for other communication commands);

04, is the data length, a single byte, representing the data length in the data buffer in the communication data frame;

7E 0B 33 02 is the 4-byte data in the data area, in which the integer number 0x0B7E composed of the first and second bytes represents the temperature data;

E0 00 is the accumulated checksum, two bytes, the low byte is E0 and the high byte is 00;

0D 0A, respectively end identifier 1 and end identifier 2, two bytes, fixed values;

Communication command line table:

Embodiment 2. On the basis of Embodiment 1, the serial port to infrared module is also connected to an infrared command receiving device, which corresponds to the light guide; the movement detection equipment is also equipped with an infrared command transmitting device to send infrared commands to The receiving device sends infrared commands to read battery status information.

In this embodiment, an infrared command receiving device is set on the serial port to infrared module, and an infrared command transmitting device is set on the mobile detection device. Therefore, the command to read the battery status information can be sent to the battery pack through the mobile detection device first, and then the battery can be The battery management module in the package transmits the battery status information to the serial port to infrared module, and then the serial port to infrared module sends infrared information containing the battery status information. The serial port to infrared module can be made to work when it needs to be read, without the need to continuously send infrared. Information saves energy.

In this case, the electric bicycle battery status detection method is:

The battery management module regularly detects the battery status information of the battery module and saves it; the mobile detection equipment sends an infrared command to read the battery status information through the infrared command transmitting device to the infrared command receiving device; the battery management module detects the battery module again and updates the battery status. After receiving the information, the battery status information is transmitted to the serial port to infrared module.

The serial port to infrared module loads the digital signal containing battery status information into the infrared signal, modulates it into a pulse sequence of a specific frequency and transmits it.

The infrared receiving end of the mobile detection device receives the pulse sequence and demodulates it to obtain the battery status information.

In this embodiment, in order to avoid the problem of high energy consumption caused by the serial port to infrared module continuously transmitting infrared signals to the outside, an infrared command transmitting device and an infrared command receiving device are set up. When it is necessary to obtain battery status information through the mobile detection device, the infrared command is transmitted The device sends an infrared command to read the battery status information to the infrared command receiving device. After receiving the infrared command, the battery management module detects the battery module again and updates the battery status information and then transmits it to the serial port to infrared module, so that the serial port to infrared module starts. The work emits infrared signals to the outside, and stops working after the transmission is completed.

As a further improvement method, when the infrared command transmitting device sends an infrared command to read the battery status information to the infrared command receiving device, the battery status information is repeatedly sent n times, so that the mobile detection device receives and demodulates n groups containing the battery. Digital signal of status information; compare the data at the same position in n groups of digital signals, and use the data with the same rate exceeding the set ratio among all the data at the same position as the trusted data of the position, and combine to obtain the final battery status information .

In this embodiment, when the infrared command transmitting device sends an infrared command, in addition to the command for the serial port to infrared module to send the battery status information, it can also include the command for the number of times of repeated sending, so that the mobile detection device can obtain several sets of battery status information. data; it can avoid the problem of incomplete information reception caused by problems such as the infrared receiving end of the mobile detection device not aligning with the light guide when only one set of battery status information is transmitted; it can also be used to collect data from multiple sets of battery status information. Compare to avoid errors in the infrared transmission process and obtain more accurate battery status information.

Embodiment 3: Based on Embodiment 1, a label containing battery pack identification information is provided on the battery pack casing, and a label reading module is also provided on the movement detection device to read the battery pack identification information in the label; or The battery pack identification information is stored in the battery management module, and the mobile detection device receives the infrared information containing the battery pack identification information sent by the serial port to infrared module.

In this embodiment, a mobile detection device will detect and obtain battery status information in a large number of battery packs within a period of time. Therefore, in order to facilitate the statistics and analysis of battery information, it is necessary to record each battery pack and its battery status information one by one. Corresponding; in order to solve this problem, a label can be set on the battery pack shell, and the label contains unique battery pack identification information, so that the mobile detection device can determine the battery status information of which battery pack; it can also be directly The battery pack identification information is combined into the infrared information of the battery status information.

In this case, the electric bicycle battery status detection method is:

Before receiving the pulse sequence containing battery status information, the mobile detection device first reads the battery pack identification information in the tag through the tag reading module, and corresponds the battery pack identification information with the battery status information; or

The mobile detection device demodulates the received pulse sequence to obtain battery pack identification information and battery status information, and corresponds the battery pack identification information to the battery status information.

The battery management module detects the battery status information of the battery module and transmits the battery status information to the serial port to infrared module.

The serial port to infrared module loads the digital signal containing battery status information into the infrared signal, modulates it into a pulse sequence of a specific frequency and transmits it.

The infrared receiving end of the mobile detection device receives the pulse sequence and demodulates it to obtain the battery status information.

Embodiment 4: Based on Embodiment 2, a label containing battery pack identification information is provided on the battery pack casing, and a label reading module is also provided on the movement detection device to read the battery pack identification information in the label; or The battery pack identification information is stored in the battery management module, and the mobile detection device receives the infrared information containing the battery pack identification information sent by the serial port to infrared module.

In this embodiment, a mobile detection device will detect and obtain battery status information in a large number of battery packs within a period of time. Therefore, in order to facilitate the statistics and analysis of battery information, it is necessary to record each battery pack and its battery status information one by one. Corresponding; in order to solve this problem, a label can be set on the battery pack shell, and the label contains unique battery pack identification information, so that the mobile detection device can determine the battery status information of which battery pack; it can also be directly The battery pack identification information is combined into the infrared information of the battery status information.

In this case, the electric bicycle battery status detection method is:

Before receiving the pulse sequence containing battery status information, the mobile detection device first reads the battery pack identification information in the tag through the tag reading module, and corresponds the battery pack identification information with the battery status information; or

The mobile detection device demodulates the received pulse sequence to obtain battery pack identification information and battery status information, and corresponds the battery pack identification information to the battery status information.

Then the battery management module regularly detects the battery status information of the battery module and saves it; the mobile detection equipment sends an infrared command to read the battery status information through the infrared command transmitting device to the infrared command receiving device; the battery management module detects the battery module again and updates the battery After receiving the status information, the battery status information is transmitted to the serial port to infrared module.

The serial port to infrared module loads the digital signal containing battery status information into the infrared signal, modulates it into a pulse sequence of a specific frequency and transmits it.

The infrared receiving end of the mobile detection device receives the pulse sequence and demodulates it to obtain the battery status information.

In this embodiment, before acquiring the battery status signal, the mobile detection device can first read the battery pack identification information in the tag set on the battery pack shell through the tag reading module, and then compare the battery pack identification information with the battery in the battery pack. The status information corresponds to facilitate subsequent analysis and processing; the infrared signal emitted by the serial port to infrared module can also contain both battery status information and battery pack identification information, which ultimately makes it possible to obtain a large amount of battery status information data when the mobile detection equipment detects Correctly associate each battery pack with its battery status information.

The above embodiments are further elaborations and explanations of the present invention to facilitate understanding, and are not intended to limit the present invention in any way. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included in the present invention. within the scope of protection of the invention.

Claims (7)

1. The battery state detection system of the electric bicycle is characterized by comprising a battery module, wherein one end of the battery module is respectively connected with one end of a serial port-to-infrared module and a first interface of a connector, the other end of the battery module is connected with one end of a battery management module, and the other end of the battery management module is respectively connected with the other end of the serial port-to-infrared module and a second interface of the connector; the serial port-to-infrared module is in communication connection with the battery management module; the serial port-to-infrared module is provided with an infrared emission end, and the infrared emission end corresponds to the light guide piece on the battery pack shell; the detection system further comprises a movement detection device provided with an infrared receiving end.

2. The system for detecting the battery state of the electric bicycle according to claim 1, wherein the serial port-to-infrared module is further connected with an infrared instruction receiving device, and the infrared instruction receiving device corresponds to the light guide member; the mobile detection equipment is also provided with an infrared instruction transmitting device which transmits an infrared instruction for reading the battery state information to an infrared instruction receiving device.

3. The electric bicycle battery state detection system according to claim 1 or 2, wherein a tag containing battery pack identification information is provided on the battery pack case, and a tag reading module is further provided on the movement detection device for reading the battery pack identification information in the tag; or (b)

And the battery management module stores battery pack identification information, and the mobile detection equipment receives infrared information which is sent by the serial port-to-infrared module and contains the battery pack identification information.

4. A battery state detection method for an electric bicycle, which is applicable to the detection system as claimed in any one of claims 1 to 3, and is characterized by comprising:

the battery management module detects battery state information of the battery module and transmits the battery state information to the serial port-to-infrared module;

the serial port-to-infrared module loads digital signals containing battery state information into infrared signals, modulates the digital signals into pulse sequences with specific frequency and transmits the pulse sequences;

and demodulating the pulse sequence received by the infrared receiving end of the mobile detection equipment to obtain battery state information.

5. The method for detecting the battery state of an electric bicycle according to claim 4, wherein the battery management module detects and stores battery state information of the battery module at regular time;

the mobile detection equipment sends an infrared instruction for reading the battery state information to the infrared instruction receiving device through the infrared instruction transmitting device; and after detecting the battery module again and updating the battery state information, the battery management module transmits the battery state information to the serial port-to-infrared module.

6. The method according to claim 4 or 5, wherein the mobile detection device reads the battery pack identification information in the tag through the tag reading module before receiving the pulse sequence containing the battery status information, and corresponds the battery pack identification information to the battery status information; or (b)

The mobile detection device demodulates the received pulse sequence to obtain battery pack identification information and battery state information, and the battery pack identification information corresponds to the battery state information.

7. The method for detecting the battery state of an electric bicycle according to claim 5, wherein the infrared command transmitting device transmits an infrared command for reading the battery state information to the infrared command receiving device, the infrared command includes a repeated transmission number n of the battery state information, and the mobile detection device receives and demodulates the digital signals to obtain n groups of digital signals containing the battery state information;

and comparing the data of the same position in the n groups of digital signals, and combining the data with the same rate exceeding the set rate in all the data of the same position as the trusted data of the position to obtain the final battery state information.