CN108110349B - Battery charging method and device and computer readable storage medium - Google Patents

Abstract

The invention provides a method and a device for charging a battery and a computer readable storage medium, relates to the technical field of batteries, and can relieve the polarization phenomenon of the battery in the charging process of the battery, effectively improve the charging capacity of the battery and prolong the service life of the battery. In one aspect, the present invention charges the battery at a constant power with a first specified power until the state of charge of the battery reaches a first threshold; then, pulse charging is carried out on the battery for at least one time, and the battery is stopped to be charged when the voltage of the battery reaches a charging cut-off voltage; wherein each pulse charge comprises: firstly, standing the battery; secondly, carrying out pulse discharge on the battery; and thirdly, charging the battery at a second specified power with constant power until the state of charge of the battery reaches a second threshold value. The invention is applied to the process of constant-power charging of the battery.

Description

A method and device for charging a battery, and a computer-readable storage medium

【Technical field】

The present invention relates to the technical field of batteries, and in particular, to a method and device for charging a battery, and a computer-readable storage medium.

【Background technique】

For charging the battery, a constant current and constant voltage charging method is mainly used in the prior art, that is, a constant current is first used to charge to a certain voltage, and then a constant voltage is used to charge to a charging cut-off current. However, in some battery application fields, such as frequency and peak regulation of power grids, because the control method is constant power control, the above-mentioned constant current and constant voltage charging method cannot be used. Instead, constant power charging is used. Way.

In the process of realizing the present invention, the inventor found that there are at least the following problems in the prior art:

When the battery is charged by the constant power charging method, the battery polarization phenomenon during the charging process cannot be alleviated, and the battery polarization accumulates during the charging process, reducing the charging capacity and service life of the battery.

[Content of the invention]

In view of this, embodiments of the present invention provide a battery charging method and device, and a computer-readable storage medium to solve the problem of battery polarization accumulation in the process of using constant power charging in the prior art, reducing the charging capacity and use of the battery lifespan issue.

In one aspect, an embodiment of the present invention provides a method for charging a battery, the method comprising:

The battery is charged with constant power with the first specified power until the state of charge of the battery reaches the first threshold value;

Perform pulse charging on the battery at least once, and stop charging the battery until the voltage of the battery reaches the charging cut-off voltage;

Wherein, each pulse charging includes:

leaving the battery at rest;

pulsing the battery;

Constant power charging of the battery at the second specified power stops until the state of charge of the battery reaches a second threshold.

According to the above aspect and any possible implementation manner, an implementation manner is further provided, wherein the second threshold value is equal to the sum of the threshold value corresponding to the adjacent previous constant power charging and the increase threshold value.

In the above aspect and any possible implementation manner, an implementation manner is further provided, wherein during each pulse charging process, the discharge amount of pulsed discharging to the battery is less than that of performing constant power on the battery with the second specified power. The amount of charge to charge.

According to the above-mentioned aspect and any possible implementation manner, an implementation manner is further provided, wherein the discharge amount of the pulse discharge is proportional to the power used during constant power charging.

The above aspects and any possible implementation manners further provide an implementation manner, in the process of each pulse charging, the time for performing pulse discharge on the battery is less than the time for performing constant power charging on the battery with the second specified power time.

According to the above aspect and any possible implementation manner, an implementation manner is further provided, and the pulse discharge of the battery includes:

pulsing the battery with a current, wherein the current is a constant current or a non-constant current;

or,

The battery is pulsed with power, wherein the discharge power is constant power or non-constant power.

Aspects as described above and any possible implementations further provide an implementation,

When using a constant current to pulse discharge the battery, the constant current is greater than or equal to 0.05C and less than or equal to 10C, where C is the rated charging current corresponding to when the battery is fully charged in 1 hour;

or,

When the battery is pulsed with a constant discharge power, the constant discharge power is greater than or equal to 0.05P and less than or equal to 10P, where P is the rated charging power corresponding to the battery being fully charged in 1 hour.

According to the above-mentioned aspect and any possible implementation manner, an implementation manner is further provided. In each pulse charging, the time used for pulse discharging is greater than or equal to 0.1 s and less than or equal to 300 s.

The above aspect and any possible implementation manner further provide an implementation manner, when the battery is a lithium iron phosphate battery, the first specified power and the second specified power are both 2P, and the pulse discharge is constant power discharge. When the first threshold is 70% of the rated battery capacity, the discharge power of each pulse discharge is 0.1P, the discharge time is 5s, and the increase threshold is 0.5% of the rated battery capacity.

According to the above aspect and any possible implementation manner, an implementation manner is further provided, wherein the first specified power is the same as the second specified power; or, the first specified power and the second specified power are different.

In another aspect, an embodiment of the present invention also provides a battery charging device, the device comprising:

a first charging unit, configured to perform constant power charging on the battery with the first specified power, and stop when the state of charge of the battery reaches a first threshold;

a second charging unit, configured to perform pulse charging on the battery at least once, and stop charging the battery when the voltage of the battery reaches the charging cut-off voltage;

Wherein, the second charging unit is specifically used for:

leaving the battery at rest;

pulsing the battery;

Constant power charging of the battery at the second specified power stops until the state of charge of the battery reaches a second threshold.

On the other hand, the implementation of the present invention also provides a computer-readable storage medium, which is characterized by comprising: computer-executable instructions, and when the computer-executable instructions are executed, the following steps are performed:

The battery is charged with constant power with the first specified power until the state of charge of the battery reaches the first threshold value;

Perform pulse charging on the battery at least once, and stop charging the battery until the voltage of the battery reaches the charging cut-off voltage;

Wherein, each pulse charging includes:

leaving the battery at rest;

pulsing the battery;

Constant power charging of the battery at the second specified power stops until the state of charge of the battery reaches a second threshold.

A technical scheme in the above-mentioned technical scheme has the following beneficial effects:

In the technical solution provided by the embodiment of the present invention, firstly use the first specified power to perform constant power charging until the state of charge of the battery reaches the first threshold, and then use the pulse charging method to charge the battery until the voltage of the battery reaches the charging cut-off. voltage, wherein each pulse charging includes: standing the battery, performing pulse discharge on the battery, and performing constant power charging on the battery with a second specified power until the state of charge of the battery reaches a second threshold. In the technical solution provided by the present invention, after the state of charge of the battery reaches the first threshold and before the voltage of the battery reaches the charging cut-off voltage, pulse charging is used for charging, because each pulse charging process includes: standing the battery and pulse During the charging process, by setting a certain number of static batteries and pulse discharge, the polarization phenomenon of the battery during the charging process can be effectively alleviated, and the risk of anode overpotential and lithium precipitation in the battery cell can be reduced, and the battery can be improved. Safety during charging and improve battery life. And the charging method provided by the present invention does not need to provide an additional conductive agent for the battery, and can be used without changing the energy density of the battery or without changing the remaining power (SOC, State-Of-Charge) of the battery. The polarization phenomenon in the battery charging process can be effectively reduced. Therefore, compared with the technical solution of adding a conductive agent or changing some parameters of the battery, the technical solution provided by the present invention has low cost and increases the battery charging capacity to a certain extent. of electricity.

【Description of drawings】

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without any creative effort.

1 is a schematic flowchart of a method for charging a battery according to an embodiment of the present invention;

2 is a charging parameter-time curve in a charging process using a method for charging a battery provided by an embodiment of the present invention;

3 is a comparison diagram of the energy retention rate-cycle number curve of the battery in the comparative example and the embodiment of the present invention;

FIG. 4 is a schematic structural diagram of an apparatus for charging a battery according to an embodiment of the present invention.

【Detailed ways】

In order to better understand the technical solutions of the present invention, the embodiments of the present invention are described in detail below with reference to the accompanying drawings.

It should be understood that the described embodiments are only some, but not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. As used in the embodiments of the present invention and the appended claims, the singular forms "a," "the," and "the" are intended to include the plural forms as well, unless the context clearly dictates otherwise.

It should be understood that the term "and/or" used in this document is only an association relationship to describe the associated objects, indicating that there may be three kinds of relationships, for example, A and/or B, which may indicate that A exists alone, and A and B exist at the same time. B, there are three cases of B alone. In addition, the character "/" in this document generally indicates that the related objects are an "or" relationship.

It should be understood that although the terms first, second, etc. may be used to describe the specified power in the embodiments of the present invention, the specified power should not be limited to these terms. These terms are only used to distinguish specified powers from one another. For example, without departing from the scope of the embodiments of the present invention, the first specified power may also be referred to as the second specified power, and similarly, the second specified power may also be referred to as the first specified power.

Depending on the context, the word "if" as used herein can be interpreted as "at" or "when" or "in response to determining" or "in response to detecting." Similarly, the phrases "if determined" or "if detected (the stated condition or event)" can be interpreted as "when determined" or "in response to determining" or "when detected (the stated condition or event)," depending on the context )" or "in response to detection (a stated condition or event)".

In order to alleviate the accumulation of battery polarization during constant power charging and reduce the charging capacity and service life of the battery, more conductive agents can be used in the battery to reduce the polarization phenomenon of the battery, but with the increase of the conductive agent in the battery , the energy density of the battery is also reduced, thereby increasing the cost. Alternatively, in order to alleviate the accumulation of battery polarization during constant power charging, the available range of the battery's state of charge is narrowed, and narrowing the available range of the battery's state of charge actually reduces the battery's available power; When the charging power is reduced in the later stage of charging, the constant power charging becomes the step-type power charging, and this operation significantly prolongs the charging time.

In order to solve the problems in the prior art, an embodiment of the present invention provides a method for charging a battery. The schematic flowchart of the method is shown in FIG. 1 , and the method includes:

101. Perform constant power charging on the battery with a first specified power, and stop when the state of charge of the battery reaches a first threshold.

The first threshold may be set according to the material of the battery cell or the model of the battery, and the present invention does not specifically limit the first threshold.

102. Perform pulse charging on the battery at least once, and stop charging the battery until the voltage of the battery reaches a charge cutoff voltage.

It should be noted that, in step 102, the battery is cycled for several times of pulse charging. After each pulse charging is performed, the BMS (Battery Management System, battery management system) needs to obtain the voltage of the battery in the current state, and compare the voltage in the current state. The size of the voltage and the charge cut-off voltage determines whether to stop charging the battery. If the voltage in the current state is less than the charge cut-off voltage, then pulse charging is performed in a cycle; if the voltage in the current state is less than the charge cut-off voltage, the battery is stopped from charging.

As the battery power increases, a certain degree of chemical reaction and the movement of electrons and ions occurs inside the battery, and the chemical reaction inside the battery and the movement of electrons and ions also produce a certain degree of battery polarization. Therefore, in order to To alleviate the accumulation of battery polarization, after the state of charge of the battery reaches the first threshold to the stage corresponding to the final stop of charging the battery, a cyclic pulse charging method is adopted, wherein each pulse charging includes:

Step 1. Let the battery stand still.

Step 2, performing pulse discharge on the battery.

Step 3: Charge the battery with a second specified power at constant power until the state of charge of the battery reaches a second threshold and stop.

Among them, after a constant power charge is performed, and before pulse discharge is performed, the battery is allowed to stand still, which can alleviate the heat accumulation of the battery during charging, reduce the internal temperature of the battery, and improve the safety performance of the battery, and can also be used to a certain extent. Alleviate the polarization phenomenon of the battery; after standing the battery, pulse discharge the battery can reduce the point of the anode of the battery cell, alleviate the problem of lithium precipitation in the battery cell, and the pulse discharge of the battery can further alleviate the polarization phenomenon of the battery; and After the pulse discharge is performed, the battery is charged with a constant power by using the second specified power, which can compensate for the power lost by the pulse discharge and enable the voltage of the battery to reach the charge cut-off voltage.

It should be noted that in the process of pulse charging the battery, in order to ensure that the voltage of the battery can reach the charging cut-off voltage faster, so as to reduce the charging time of the battery, the second threshold value is equal to the adjacent previous constant power charging corresponding threshold value. and the sum of the increase threshold.

It should also be noted that, in the charging process, the first specified power used in the initial stage of charging may be the same as the second specified power used in the pulse charging process; The second specified power may also be different. The present invention does not specifically limit the first specified power and the second specified power. The first specified power and the second specified power can be set according to the material of the battery cell or the relevant performance parameters of the battery . In addition, it should be noted that the second specified power used for each pulse charging may be the same or different, and the present disclosure does not specifically limit the relationship between the second specified powers used for each pulse charging.

In the technical solution provided by the embodiment of the present invention, firstly use the first specified power to perform constant power charging until the state of charge of the battery reaches the first threshold, and then use the pulse charging method to charge the battery until the voltage of the battery reaches the charging cut-off. voltage, wherein each pulse charging includes: standing the battery, performing pulse discharge on the battery, and performing constant power charging on the battery with a second specified power until the state of charge of the battery reaches a second threshold. In the technical solution provided by the present invention, after the state of charge of the battery reaches the first threshold and before the voltage of the battery reaches the charging cut-off voltage, pulse charging is used for charging, because each pulse charging process includes: standing the battery and pulse During the charging process, by setting a certain number of static batteries and pulse discharge, the polarization phenomenon of the battery during the charging process can be effectively alleviated, and the risk of anode overpotential and lithium precipitation in the battery cell can be reduced, and the battery can be improved. Safety during charging and improve battery life. And the charging method provided by the present invention does not need to provide an additional conductive agent for the battery, and can be used without changing the energy density of the battery or without changing the remaining power (SOC, State-Of-Charge) of the battery. The polarization phenomenon in the battery charging process can be effectively reduced. Therefore, compared with the technical solution of adding a conductive agent or changing some parameters of the battery, the technical solution provided by the present invention has low cost and increases the battery charging capacity to a certain extent. of electricity.

Further, since there is a certain frequency of pulse discharge in the whole charging process, in order to ensure that the battery's power is in an increasing state during the pulse charging process, in each pulse charging process, the discharge volume of the battery for pulse discharge is less than The second specified power is the charge amount for constant power charging of the battery.

Specifically, in order to realize that the discharge amount of the pulse discharge is smaller than the charge amount of the constant power charging of the battery with the second specified power, in each pulse charging process, the time of the pulse discharge is adjusted so that the time of the pulse discharge of the battery is less than that of the battery. The time during which the battery is charged at a constant power with the second specified power, so that the discharge amount of the pulse discharge is less than the charging amount of the battery under the constant power charging with the second specified power. Among them, in order to ensure the efficiency of battery charging, in each pulse charging, the time used for pulse discharge is greater than or equal to 0.1s and less than or equal to 300s. Alternatively, in order to realize that the discharge amount of the pulse discharge is smaller than the charge amount of the constant power charging of the battery with the second specified power, during each pulse charging process, it is also possible to adjust the relevant power parameters used in the discharge process (for example, the discharge current. , discharge power, discharge voltage, etc.), the discharge amount of pulse discharge is less than the charge amount of constant power charging of the battery with the second specified power; The relevant power parameters used to achieve the discharge amount of the pulse discharge are smaller than the charge amount of the constant power charging of the battery at the second specified power.

Please refer to FIG. 2 . FIG. 2 is a charging parameter-time curve during the charging process using the battery charging method provided by the embodiment of the present invention. Among them, the abscissa is time; the ordinate is the charging parameter used in the charging process using the method provided by the present invention, the above abscissa corresponds to the constant power charging process, and the abscissa below corresponds to the pulse discharge process. In this curve, the area of the rectangular closed area formed by the abscissa and ordinate represents the charge amount of the battery by constant power charging or the discharge amount of the pulse discharge.

It should also be noted that the discharge amount of pulse discharge is proportional to the power used in constant power charging. The greater the charging power used in constant power charging, the more obvious the battery polarization caused by constant power charging. The polarization phenomenon of the battery is improved, the service life of the battery is increased, and the discharge amount of the pulse discharge is also increased. Wherein, increasing the discharge amount of the pulse discharge can be achieved by increasing the pulse discharge time, and/or increasing the relevant power parameters (eg, current, voltage, power, etc.) used in the pulse discharge.

Further, the pulse discharge of the battery may be performed in the manner of current discharge, that is, the pulse discharge of the battery is performed by using a current, wherein the current is a constant current or a non-constant current.

Specifically, when the battery is pulsed with a constant current, the constant current of the pulsed discharge is greater than or equal to 0.05C and less than or equal to 10C, where C is the rated charging current corresponding to the battery being fully charged in 1 hour.

Further, the pulsed discharge of the battery can also be performed by means of power discharge, and the battery is pulsed to discharge with power, wherein the discharge power is constant power or non-constant power.

Specifically, when the battery is pulsed with a constant discharge power, the constant discharge power is greater than or equal to 0.05P and less than or equal to 10P, where P is the rated charging power corresponding to the battery being fully charged in 1 hour.

Further, when the charging method provided by the present invention is applied to a lithium iron phosphate battery, that is, when the battery is a lithium iron phosphate battery, the first specified power and the second specified power are both 2P, and the pulse discharge is a constant power discharge. When the first threshold is 70% of the rated battery capacity, the power of each pulse discharge is 0.1P, the discharge time is 5s, and the increase threshold is 0.5% of the rated battery capacity.

It is added that when the battery is a lithium iron phosphate battery, the first specified power and the second specified power are both 2P, and the pulse discharge is constant power discharge, the first threshold is 70% of the rated capacity of the battery, and each pulse discharge also increases. It can be discharged with a current of 0.1C, a discharge time of 5s, and an increase threshold of 0.5% of the rated capacity of the battery.

Based on the material and performance of the lithium iron phosphate battery, the battery's charging capacity is before 70% of the battery's rated capacity, and the battery polarization accumulation degree is relatively small. Therefore, shorten the battery's charging time and set the first threshold to 70% of the battery's rated capacity; During the pulse discharge process, if the power of the pulse discharge or the current of the pulse discharge is less than the first value, and/or the discharge time is less than the second value, the polarization of the battery will be alleviated to the extent that the battery using constant power charging is The performance improvement effect is not obvious; if the power of the pulse discharge or the current of the pulse discharge is greater than the third value, and/or the discharge time is greater than the fourth value, the pulse discharge will cause too much loss of battery capacity, resulting in a long charging time. To ensure that the battery power will not be lost too much due to discharge, it can effectively alleviate the phenomenon of battery polarization. In the process of pulse discharge, the power of pulse discharge is 0.1P or the current of pulse discharge is 0.1C, and the discharge time lasts 5s.

In the following, a cycle test is carried out on Comparative Example 1, Comparative Example 2, Comparative Example 3 and the embodiment of the present invention using the prior art, and the test results are compared.

Comparative Example 1

a) During charging, the battery is charged with 2P(W) constant power to the end-of-charge voltage of nC constant current charging allowed by the battery.

b) Let stand for 30min.

c) During discharge use, the battery discharges with mP (W) constant power to the allowable termination voltage of constant current discharge;

d) let stand for 30min.

The above steps a) to d) are cyclically performed several times, thereby obtaining the energy retention rate-cycle number curve of the scheme of Comparative Example 1.

Comparative Example 2

In order to further improve the service life and performance of the battery, based on the scheme of Comparative Example 1, the battery life and performance were further improved by adjusting the termination voltage during the charging process in Comparative Example 2. The scheme of Comparative Example 2 is as follows:

a) During charging, the battery is charged with 2P(W) constant power to a certain voltage less than the end-of-charge voltage of nC constant-current charging allowed by the battery.

b) Let stand for 30min.

c) During discharge use, the battery discharges with mP (W) constant power to the allowable termination voltage of constant current discharge;

d) let stand for 30min.

The above steps a) to d) are cyclically performed several times, thereby obtaining the energy retention rate-cycle number curve of the second scheme of the comparative example.

Comparative example three

Comparative Example 3 is based on the solution of Comparative Example 1. By adjusting the discharge termination voltage during the discharge process, the service life and performance of the battery are further improved. The solution of Comparative Example 3 is as follows:

a) During charging, the battery is charged with 2P(W) constant power to the end-of-charge voltage of nC constant current charging allowed by the battery.

b) Let stand for 30min.

c) During discharge use, the battery is discharged with mP (W) constant power to a certain voltage higher than the allowable termination voltage of constant current discharge.

d) let stand for 30min.

The above steps a) to d) are cyclically performed several times, thereby obtaining the energy retention rate-cycle number curve of the third scheme of the comparative example.

Example 1

a) During the charging process, perform the following steps:

Step 1, the battery is charged to 80% SOC with a constant power of 2P(W).

Step 2, let stand for 2s.

Step 3, the battery is discharged at a constant current of 0.1P(W) for 5s.

Step 4, the battery is charged with 2P1 (W) constant power to a SOC value 0.5% higher than the SOC value reached by the previous step of constant power charging.

Step 5: Steps 2 to 4 are performed in a continuous cycle until the battery reaches the end-of-charge voltage.

b) Let stand for 30mins.

c) During the discharge process, the battery is discharged with mP1 (W) constant power to the allowable termination voltage of constant current discharge.

d) let stand for 30min.

The above steps a) to d) are cyclically performed for several times, thereby obtaining the energy retention rate-cycle number curve of the scheme of the first embodiment.

In order to more intuitively demonstrate to those skilled in the art that the technical solutions provided by the embodiments of the present invention can improve the service life and performance of batteries, the energy retention rates of Comparative Example 1, Comparative Example 2, Comparative Example 3 and Example 1 -The cycle number curve is shown by Fig. 3. Fig. 3 is a comparison diagram of the energy retention rate-cycle number curve of the battery in the comparative example and the embodiment of the present invention. From the comparison diagram shown in Fig. 3, those skilled in the art can easily It can be seen that, compared with Comparative Example 1 and Comparative Example 2, with the increase of the number of battery cycles in Example 1, the decrease in the battery energy retention rate in Example 1 is significantly lower than that in Comparative Example 1 and Comparative Example 2. Compared with Comparative Example 3, the degree of decrease in the battery energy retention rate in Example 1 is also significantly lower than that in Comparative Example 3. Therefore, compared with the solutions provided in Comparative Example 1, Comparative Example 2, and Comparative Example 3, the solution in Example 1 is not Changing the parameters of the battery during discharge and use can significantly improve the service life and performance of the battery.

It should be noted that, in order to significantly improve the service life and performance of the battery, the solution in Embodiment 1 can also change the discharge termination voltage during the discharge process to further improve the service life and performance of the battery

It should also be noted that, when using the solution provided by the present invention, the relevant parameter values in the charging process are not limited to the parameter values provided in Implementation 1, and the relevant parameter values in the charging process can be set as required, as given below. It is the second embodiment and the third embodiment. The present invention does not specifically limit the relevant parameter values during the charging process, as long as the set parameter values are within the specified range.

Embodiment 2

a) During the charging process, perform the following steps:

Step 1, the battery is charged to 80% SOC with 2P1 (W) constant power.

Step 2, let stand for 2s.

Step 3: The battery is discharged at a constant current of 0.1C1(A) for 3s.

Step 4, the battery is charged with 2P1 (W) constant power to a SOC value 0.5% higher than the SOC value reached by the previous step of constant power charging.

Step 5: Steps 2 to 4 are performed in a continuous cycle until the battery reaches the end-of-charge voltage.

b) Let stand for 30mins.

c) The battery is discharged with mP1 (W) constant power to the allowable termination voltage of constant current discharge.

d) let stand for 30min.

Embodiment 3

a) During the charging process, perform the following steps:

Step 1, the battery is charged to 70% SOC with 4P1 (W) constant power.

Step 2, let stand for 2s.

Step 3: The battery is discharged at a constant current of 0.1C1(A) for 5s.

In step 4, the battery is charged with a constant power of 4P1 (W) to a SOC value that is 0.5% higher than the SOC value reached by the constant power charging in the previous step.

Step 5: Repeat Step 2 to Step 4 continuously until the battery reaches the end-of-charge voltage.

b) Let stand for 30mins.

c) The battery is discharged with mP1 (W) constant power to the allowable termination voltage of constant current discharge.

d) let stand for 30min.

An embodiment of the present invention provides a device for charging a battery. A schematic diagram of the structure of the device is shown in FIG. 4 , and the device includes:

The first charging unit 21 is configured to perform constant power charging on the battery with the first specified power, and stop when the state of charge of the battery reaches the first threshold.

The second charging unit 22 is configured to perform pulse charging on the battery at least once, and stop charging the battery until the voltage of the battery reaches the charge cut-off voltage.

Wherein, the second charging unit 22 is specifically used for:

Let the battery sit.

The battery is pulsed discharged.

Constant power charging of the battery at the second specified power stops until the state of charge of the battery reaches a second threshold.

An embodiment of the present invention further provides a computer-readable storage medium, comprising: computer-executable instructions, when the computer-executable instructions are executed, the following steps are performed:

The battery is charged with constant power at the first specified power until the state of charge of the battery reaches a first threshold.

The battery is charged with pulses at least once, and the charging of the battery is stopped until the voltage of the battery reaches the charge cut-off voltage.

Wherein, each pulse charging includes:

leaving the battery at rest;

pulsing the battery;

Constant power charging of the battery at the second specified power stops until the state of charge of the battery reaches a second threshold.

In the technical solution provided by the embodiment of the present invention, firstly use the first specified power to perform constant power charging until the state of charge of the battery reaches the first threshold, and then use the pulse charging method to charge the battery until the voltage of the battery reaches the charging cut-off. voltage, wherein each pulse charging includes: standing the battery, performing pulse discharge on the battery, and performing constant power charging on the battery with a second specified power until the state of charge of the battery reaches a second threshold. In the technical solution provided by the present invention, after the state of charge of the battery reaches the first threshold and before the voltage of the battery reaches the charging cut-off voltage, pulse charging is used for charging, because each pulse charging process includes: standing the battery and pulse During the charging process, by setting a certain number of static batteries and pulse discharge, the polarization phenomenon of the battery during the charging process can be effectively alleviated, and the risk of anode overpotential and lithium precipitation in the battery cell can be reduced, and the battery can be improved. Safety during charging and improve battery life. And the charging method provided by the present invention does not need to provide an additional conductive agent for the battery, and can be used without changing the energy density of the battery or without changing the remaining power (SOC, State-Of-Charge) of the battery. The polarization phenomenon in the battery charging process can be effectively reduced. Therefore, compared with the technical solution of adding a conductive agent or changing some parameters of the battery, the technical solution provided by the present invention has low cost and increases the battery charging capacity to a certain extent. of electricity.

Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the system, device and unit described above may refer to the corresponding process in the foregoing method embodiments, which will not be repeated here.

In the several embodiments provided by the present invention, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the apparatus embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components may be combined. Either it can be integrated into another system, or some features can be omitted, or not implemented. On the other hand, the shown or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, indirect coupling or communication connection of devices or units, and may be in electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution in this embodiment.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware, or may be implemented in the form of hardware plus software functional units.

The above-mentioned integrated units implemented in the form of software functional units can be stored in a computer-readable storage medium. The above-mentioned software functional unit is stored in a storage medium, and includes several instructions to cause a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor (Processor) to execute the methods described in the various embodiments of the present invention. some steps. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disk or optical disk and other media that can store program codes .

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the present invention. within the scope of protection.

Claims (11)

1. A method for charging a battery, wherein the method comprises: The battery is charged with constant power with the first specified power until the state of charge of the battery reaches the first threshold value; Perform pulse charging on the battery at least once, and stop charging the battery until the voltage of the battery reaches the charging cut-off voltage; Among them, each pulse charge includes: leaving the battery at rest; pulsing the battery; The battery is charged with constant power at the second specified power until the state of charge of the battery reaches a second threshold value; the second threshold value is equal to the sum of the corresponding threshold value and the increase threshold value of the adjacent previous constant power charge . 2 . The method according to claim 1 , wherein, in each pulse charging process, the discharge amount for pulsed discharging of the battery is less than the charge amount for constant power charging of the battery with the second specified power. 3 . 3 . The method according to claim 2 , wherein the discharge amount of the pulse discharge is proportional to the power used during constant power charging. 4 . 4 . The method according to claim 2 , wherein, in each pulse charging process, the time for performing pulse discharge on the battery is less than the time for performing constant power charging on the battery with the second specified power. 5 . 5. The method of claim 1, wherein the pulsed discharging of the battery comprises: pulsing the battery with a current, wherein the current is a constant current or a non-constant current; or, The battery is pulsed with power, wherein the discharge power is constant power or non-constant power. 6. The method of claim 5, wherein When using a constant current to pulse discharge the battery, the constant current is greater than or equal to 0.05C and less than or equal to 10C, where C is the rated charging current corresponding to the battery being fully charged in 1 hour; or, When the battery is pulsed with constant power, the constant power is greater than or equal to 0.05P and less than or equal to 10P, wherein P is the rated charging power corresponding to the battery being fully charged in 1 hour. The method according to claim 1 or 5, characterized in that, in each pulse charging, the time used for pulse discharging is greater than or equal to 0.1s and less than or equal to 300s. 8. The method according to claim 2, wherein when the battery is a lithium iron phosphate battery, the first specified power and the second specified power are both 2P, and the pulse discharge is constant power discharge, the first specified power and the second specified power are 2P. A threshold is 70% of the rated capacity of the battery, the discharge power of each pulse discharge is 0.1P, the discharge time is 5s, and the increase threshold is 0.5% of the rated capacity of the battery. 9 . The method according to claim 1 , wherein the first specified power and the second specified power are the same; or, the first specified power and the second specified power are different. 10 . 10. A device for charging a battery, characterized in that the device comprises: a first charging unit, configured to perform constant power charging on the battery with the first specified power, and stop when the state of charge of the battery reaches a first threshold; a second charging unit, configured to perform pulse charging on the battery at least once, and stop charging the battery when the voltage of the battery reaches the charging cut-off voltage; Wherein, the second charging unit is specifically used for: leaving the battery at rest; pulsing the battery; The battery is charged with constant power at the second specified power, and stops until the state of charge of the battery reaches a second threshold; the second threshold is equal to the sum of the threshold corresponding to the adjacent previous constant power charging and the increase threshold. 11. A computer-readable storage medium, comprising: a computer-executable instruction that performs the following steps when the computer-executable instruction is executed: The battery is charged with constant power with the first specified power until the state of charge of the battery reaches the first threshold value; Perform pulse charging on the battery at least once, and stop charging the battery until the voltage of the battery reaches the charging cut-off voltage; Among them, each pulse charge includes: leaving the battery at rest; pulsing the battery; The battery is charged with constant power at the second specified power, and stops until the state of charge of the battery reaches a second threshold; the second threshold is equal to the sum of the threshold corresponding to the adjacent previous constant power charging and the increase threshold.

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