WO2021217314A1

WO2021217314A1 - Battery equalization method, intelligent battery, charging system and storage medium

Info

Publication number: WO2021217314A1
Application number: PCT/CN2020/087086
Authority: WO
Inventors: 赵云飞; 唐阳洋
Original assignee: 深圳市大疆创新科技有限公司
Priority date: 2020-04-26
Filing date: 2020-04-26
Publication date: 2021-11-04
Also published as: CN112789780A

Abstract

Disclosed are a battery equalization method, an intelligent battery, a charging system and a storage medium. The equalization method comprises: acquiring the state of charge of a plurality of cells in a battery (S101); according to the state of charge, determining an equalization trigger condition that the cells meet, and according to the equalization trigger condition, executing voltage difference equalization or capacity equalization on the cells (S102); and according to the state of charge, determining an equalization starting condition that the cells meet, and according to the equalization starting condition, starting voltage difference equalization or capacity equalization on the cells (S103). By combining voltage difference equalization with capacity equalization and implementing the decoupling of equalization starting determination and equalization execution, scenarios for battery equalization starting can be increased, and the equalization accuracy and the equalization effect of a battery can be improved.

Description

Battery balancing method, smart battery, charging system and storage medium

Technical field

This application relates to the field of battery technology, and in particular to a method for balancing a battery, a smart battery, a charging system, and a storage medium.

Background technique

In order to meet the requirements of battery capacity and voltage, practical applications need to use multiple cells in series and parallel to form a battery pack to achieve higher output voltage and higher output power. Under ideal conditions, the state of all cells in the battery pack remains the same. However, the subtle process differences in the manufacturing process will lead to differences in the capacity and internal resistance between the cells. During the cycle of work, due to the different working conditions of the cells, such as different conditions of use, this difference is The cyclical charging and discharging process of the battery continues to intensify, which in turn causes the phenomenon of unbalanced battery packs. When the battery pack is unbalanced, it may cause some cells to be overcharged or overdischarged. Overcharge or overdischarge of the cells will damage the battery, which will affect the use and service life of the battery pack, and may even cause fire or explosion. Therefore, it is necessary to balance the cells in the battery pack. However, the existing equalization methods have problems such as low equalization accuracy and poor effect.

Summary of the invention

Based on this, the present application provides a battery balancing method, a smart battery, a charging system, and a storage medium to improve the balancing accuracy and the balancing effect of the battery.

In a first aspect, the present application provides a method for balancing a battery, the battery includes a plurality of battery cells, and the balancing method includes:

Obtain the state of charge of multiple cells in the battery;

Determine the equalization trigger condition that the battery cell satisfies according to the state of charge, and perform pressure difference equalization or capacity equalization on the battery cell according to the equalization trigger condition; and,

Determining the equalized turn-on condition that the battery cell satisfies according to the state of charge, and turn on the voltage difference equalization or the capacity equalization of the battery core according to the equalized turn-on condition;

Wherein, the equalization trigger condition corresponding to the pressure difference equalization is different from the equalization opening condition, and/or the equalization trigger condition corresponding to the capacity equalization is different from the equalization opening condition.

In addition, the present application also provides a method for balancing a battery, the battery includes a plurality of battery cells, and the balancing method includes:

Obtain the state of charge of multiple cells in the battery;

The equalization trigger condition that the battery cell satisfies is determined according to the state of charge, the equalization trigger condition includes an equalization trigger condition for pressure difference equalization and an equalization trigger condition for capacity equalization, and the priority of the pressure difference equalization is higher than that of the Priority of capacity balancing;

According to the equalization trigger condition satisfied by the battery core, the voltage difference equalization or the capacity equalization is performed on the battery core.

Obtain the state of charge of multiple cells in the battery;

Determining an equalization trigger condition that the battery cell satisfies according to the state of charge, where the equalization trigger condition includes an equalization trigger condition for pressure difference equalization and an equalization trigger condition for capacity equalization;

If the battery cell satisfies the equalization trigger condition of the pressure difference equalization, perform the voltage difference equalization on the battery cell;

If the battery cell satisfies the balance trigger condition of the capacity balance, the capacity balance is performed on the battery cell.

Obtain the state of charge of multiple cells in the battery;

Determine the equalization trigger condition satisfied by the battery cell according to the state of charge, and determine the equalization activation condition satisfied by the battery cell according to the state of charge, wherein the equalization trigger condition is different from the equalization activation condition; and

The electrical properties are equalized according to the equalization trigger condition, and the battery core is turned on and equalized according to the equalization opening condition.

In the second aspect, the present application also provides a smart battery, which includes:

Multiple batteries;

An equalizing circuit, the equalizing circuit is connected to the battery core, and is used for equalizing the battery core;

A control circuit, the control circuit is connected to the equalization circuit, wherein the control circuit includes a processor and a memory;

The memory is used to store a computer program;

The processor is configured to execute the computer program and, when the computer program is executed, implement the equalization method described in any one of the foregoing.

In a third aspect, the present application also provides a charging system, which includes a charger and any one of the smart batteries described above, and the charger is used to charge the smart batteries.

In a fourth aspect, the present application also provides a computer-readable storage medium, the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the processor implements the above-mentioned equalization method.

The battery balancing method, smart battery, charging system, and storage medium proposed in this application can increase the balance of the battery by combining differential pressure balancing and capacity balancing, and decoupling balanced opening and balancing execution, and at the same time It also improves the equalization accuracy and equalization effect.

It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the application.

Description of the drawings

In order to explain the technical solutions of the embodiments of the present application more clearly, the following will briefly introduce the drawings used in the description of the embodiments. Obviously, the drawings in the following description are some embodiments of the present application. Ordinary technicians can obtain other drawings based on these drawings without creative work.

FIG. 1 is a schematic block diagram of a charging system provided by an embodiment of the present application;

2 is a schematic diagram of a circuit structure of a smart battery provided by an embodiment of the present application;

FIG. 3 is a schematic diagram of the circuit structure of another smart battery provided by an embodiment of the present application;

4 is a schematic diagram of the circuit structure of another smart battery provided by an embodiment of the present application;

FIG. 5 is a schematic flowchart of steps of an equalization method provided by an embodiment of the present application;

6 is a schematic flowchart of steps of another equalization method provided by an embodiment of the present application;

FIG. 7 is a schematic flowchart of steps of another equalization method provided by an embodiment of the present application;

FIG. 8 is a schematic flowchart of steps of yet another equalization method provided by an embodiment of the present application; FIG.

Fig. 9 is a schematic block diagram of a smart battery provided by an embodiment of the present application.

Detailed ways

The technical solutions in the embodiments of the present application will be described clearly and completely in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of them. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of this application.

The flowchart shown in the drawings is only an example, and does not necessarily include all contents and operations/steps, nor does it have to be executed in the described order. For example, some operations/steps can also be decomposed, combined or partially combined, so the actual execution order may be changed according to actual conditions.

At present, in order to increase the capacity of the battery, or to increase the voltage of the battery, it is usually necessary to form a battery pack in series and parallel with multiple cells to achieve a higher output voltage and a larger output power to meet the requirements of powering electronic devices. need.

Ideally, the state of all cells in the battery pack should be consistent. However, the subtle process differences in the manufacturing process will lead to differences in the capacity and internal resistance between the cells. During the processing cycle, due to the different working conditions of the cells, such as different operating temperatures, this This difference will continue to aggravate during the battery cycle charging and discharging process, which will result in unbalanced battery packs. When the battery pack is unbalanced, it may cause some cells to be overcharged or overdischarged. Overcharge or overdischarge of the cells will damage the battery, which will affect the safety and service life of the battery, and may even cause fire or explosion. Therefore, it is necessary to balance the cells in the battery pack. However, the existing equalization methods all have problems such as low equalization accuracy and poor effect.

The inventor found that in the process of charging the smart battery through the charger, or in the process of discharging when the battery is supplying power to the electronic device, due to the difference in the battery's single cells, the battery will be unbalanced, which may be unbalanced. Some batteries may be overcharged or over-discharged. Overcharge or over-discharge of the battery cells will damage the battery, which will affect the battery's characteristics and service life, and may even cause fire or explosion. When the battery is used on a movable platform, for example, the battery is used in a drone, due to the above-mentioned imbalance, the single operation time of the drone is limited, which affects the user's flight experience and may even be safe risk.

In short, when there is an imbalance in the battery, a certain battery cell in the battery will affect the overall capacity of the battery due to the "barrel effect", and its life will also accelerate decay and increase the cost of use. Therefore, in the series and parallel use of batteries, each battery cell needs to be balanced.

However, the current battery equalization schemes are mostly differential pressure equalization, but based on the differential pressure equalization scheme, there are the following problems: 1), low equalization accuracy: when the voltage is used for equalization, near full charge, the capacity difference between the cells can be ignored. The balance accuracy is affected, and the balance accuracy is high, but when the SOC range is low, the difference in the capacity between the cells leads to a large balance error; 2) Failure to release the maximum output energy of the battery: the inconsistency of the single cell capacity causes the battery voltage to fail It truly reflects the energy state of the battery. After the pressure difference is equalized, the single cells cannot be fully charged at the same time due to the difference in capacity between the cells, failing to release the maximum output energy of the battery.

Of course, capacity balancing is currently used. The balancing effect of the capacity balancing scheme is ideal and the balancing error is small. However, the capacity balancing scheme also has the following problems: It is necessary to accurately estimate the SOC of each battery cell. In actual application, the battery needs to pass a long time. After the rest time, the open circuit voltage (OCV) of the battery cell is used to obtain the SOC of the battery, but there are fewer opening scenarios that lead to equalization, and therefore, the equalization effect is poor.

To this end, the embodiments of the present application provide a battery balancing method, a smart battery, a charging system, and a storage medium. The balancing method is applied to a smart battery and can improve the balancing accuracy and the balancing effect of the smart battery.

Hereinafter, some embodiments of the present application will be described in detail with reference to the accompanying drawings. In the case of no conflict, the following embodiments and features in the embodiments can be combined with each other.

Please refer to FIG. 1, which is a schematic block diagram of a charging system provided by an embodiment of the present application. The charging system 100 includes a charger 10 and a smart battery 20. The charger 10 is used to connect an external power source to charge the smart battery 20, and the smart battery 20 is used to power electronic devices, for example, to power a movable platform and a load carried on the movable platform.

Among them, movable platforms include aircraft, robots, electric vehicles or autonomous unmanned vehicles.

For example, the smart battery 20 supplies power to the motor of the aircraft to control the rotation of the propeller of the motor, so as to realize the flight of the aircraft; for another example, the smart battery 20 powers the camera camera mounted on the aircraft for aerial photography and so on.

Aircraft include drones, which include rotary-wing drones, such as quadrotor drones, hexarotor drones, and octo-rotor drones. It can also be a fixed-wing drone or a rotary-wing drone. The combination with fixed-wing UAV is not limited here. The UAV can be an agricultural UAV, an industry application UAV, a consumer UAV, and a traversing aircraft. The UAV can have a long single operation time requirement.

The robots include educational robots, which use a Mecanum wheel omnidirectional chassis, and are equipped with multiple pieces of intelligent armor. Each intelligent armor has a built-in impact detection module that can quickly detect physical attacks. At the same time, it also includes a two-axis pan/tilt, which can be flexibly rotated, matched with the transmitter to accurately, stably and continuously fire crystal bombs or infrared beams, and matched with ballistic light effects, giving users a more realistic shooting experience.

Specifically, as shown in FIG. 2, the smart battery 20 includes a plurality of battery cells 201, an equalization circuit 202 and a control circuit 21. Among them, a plurality of battery cells 201 are connected in series, and of course also in parallel. The equalizing circuit 202 is connected to the battery core 201 for equalizing the battery core 201. Specifically, the equalizing circuit 202 is also connected to the control circuit 21, and the battery core 201 is equalized under the control of the main control circuit 21.

Wherein, the control circuit 21 includes a Microcontroller Unit (MCU), which is used to execute the equalization method provided in the present application to improve the equalization accuracy and equalization effect of the battery, thereby increasing the service life of the battery.

Among them, the micro-control unit is used to obtain the battery parameters of the battery and process the battery parameters, such as charging current, charging voltage, charging time, discharging current, discharging current, discharging time, constant voltage charging time, constant voltage charging capacity and The charge-discharge capacity ratio and so on.

Exemplarily, the micro-control unit may be used to estimate the state of charge, such as determining the state of charge of the battery cell according to the open circuit voltage, and used to determine the equalization start judgment and/or equalization execution of the battery according to the state of charge.

In some embodiments, the smart battery 20 may also include a battery management system (Battery Management System, BMS), which performs the function of the main control circuit, that is, the battery management system includes a micro-control unit.

In some embodiments, the battery management system BMS may include a fuel gauge, which may be used to calculate the state of charge (SOC) of the battery cells, that is, the remaining battery power.

In some embodiments, as shown in FIG. 3, the smart battery 20 further includes a heating device 22, and the heating device 22 is used to heat the cells of the battery. Specifically, the heating device 22 includes a heating element, which is arranged close to the cell of the battery and used for heating the cell of the battery. Specifically, the heating device 22 is connected to the control circuit 21 and can heat the battery of the battery under the control of the control circuit 21. In some embodiments, the smart battery 20 may be installed in a battery compartment of a movable platform. When the smart battery 20 is installed in the battery compartment, an in-position detection mechanism is triggered to determine whether the battery is installed in place.

In some embodiments, as shown in FIG. 4, the battery of the smart battery 20 is provided with a power management device, and the power management device is used to communicate with the battery, that is, to communicate with the control circuit 21 of the battery. The device is provided with a heating device 22 for heating the cells of the battery according to the working state of the battery.

Exemplarily, for example, the power management device is used to communicate with the battery, and when it is determined that the cells of the battery are performing equalization, the heating device is controlled to heat the battery of the battery, so that the battery temperature is substantially constant.

In some embodiments, the heating device can also perform operations to dissipate heat and heat the battery. The heating device is capable of transferring heat, and the heating device is close to each cell disposed in the smart battery 20, so that the heat of each cell can be transferred to the heating device.

In some embodiments, the smart battery 20 further includes a prompt module, which includes a display, an indicator light, or a voice announcer, etc., for outputting battery-related information to inform the user.

Exemplarily, for example, the equalization information corresponding to the equalization performed on the battery cell is obtained, and the equalization information is output, and specifically, the equalization information may be displayed on a display. For another example, monitoring and acquiring abnormal information when performing equalization on the battery cell, and prompting according to the abnormal information, specifically, the abnormal information may be displayed by an indicator light for prompting.

Hereinafter, based on the charging system in FIG. 1 and the smart battery in FIG. 2, the battery balancing method provided in the present application will be introduced in detail. It should be noted that the charging systems and smart batteries illustrated in Figures 1 and 2 do not constitute a limitation on the application of the equalization method provided in this application.

Please refer to FIG. 5, which is a schematic flowchart of steps of a battery balancing method provided by an embodiment of the present application. The equalization method is applied to smart batteries, and is used to equalize the cells of the battery, so as to improve the equalization accuracy and equalization effect, and thereby increase the service life of the battery.

As shown in FIG. 5, the equalization method includes step S101 to step S103.

S101. Obtain the state of charge of multiple cells in the battery;

S102: Determine an equalization trigger condition that the battery cell satisfies according to the state of charge, and perform pressure difference equalization or capacity equalization on the battery cell according to the equalization trigger condition;

S103: Determine the equalized turn-on condition that the battery cell satisfies according to the state of charge, and turn on the voltage difference equalization or capacity equalization of the battery cell according to the equalized turn-on condition.

Specifically, the state of charge can be detected by the fuel gauge in the smart battery, or it can be calculated by the micro-control unit to obtain the respective state of charge of the multiple cells in the battery, so as to be based on the state of charge of the cells. It is determined whether the battery cell meets the equalization trigger condition and/or whether the equalization start condition is satisfied.

In some embodiments, in order to obtain a more accurate state of charge, thereby improving the accuracy and effect of battery balancing. Wherein, to obtain the state of charge of multiple cells in the battery, specifically, after the battery is left for a first preset period of time, the open circuit voltages of the multiple cells in the battery are obtained, and then the open circuit voltage is determined according to the open circuit voltage. The state of charge of the core.

Wherein, after the battery is allowed to stand for the first preset period of time, it can be ensured that the voltage of each cell of the battery is stable, so that a more accurate state of charge can be obtained according to the open circuit voltage. Due to the difference in battery or processing technology of different materials, the first preset duration corresponding to the battery will be different. Therefore, the size of the first preset duration can be measured for different batteries in practical applications, and the measurement will be obtained. The first preset period of time is stored in the battery for use when obtaining the open circuit voltage.

Since different cells of the same battery may be different, the corresponding time lengths of different cells when the voltage is stable are also different, that is, each cell of the battery corresponds to a corresponding second preset time length, and there are multiple The second preset duration of the batteries is the same or different.

In some embodiments, in order to further obtain a more accurate state of charge, so as to improve the accuracy and effect of battery balancing. Obtain the state of charge of multiple cells in the battery. Specifically, after each cell in the battery is allowed to stand for a second preset period of time corresponding to the cell, the open circuit voltage of the cell can be obtained, and then according to The open circuit voltage of the cell determines the state of charge of the cell.

After obtaining the state of charge of the plurality of cells in the battery, the equilibrium trigger condition satisfied by the cell may be determined according to the state of charge, and the equilibrium activation condition satisfied by the cell may be determined according to the state of charge.

Among them, the equalization trigger condition is used to trigger the battery to perform equalization, including the equalization trigger condition corresponding to the differential pressure equalization and the equalization trigger condition corresponding to the capacity equalization; the equalization opening condition is used to judge whether the battery cells are in equilibrium, including the differential pressure equalization The corresponding equalization opening condition and the equalization opening condition corresponding to the capacity equalization.

In the embodiment of the present application, the equalization trigger condition corresponding to the pressure difference equalization is different from the equalization opening condition, and/or the equalization trigger condition corresponding to the capacity equalization is different from the equalization opening condition . As a result, the equalization opening scene can be increased, and the accuracy and effect of equalization can be improved.

Exemplarily, for example, the equalization trigger condition corresponding to the pressure difference equalization is the same as the equalization opening condition corresponding to the pressure difference equalization, but the equalization trigger condition corresponding to the capacity equalization is the same as the capacity equalization The corresponding equalization opening conditions are different.

Exemplarily, for example, the equalization trigger condition corresponding to the differential pressure equalization is different from the equalization opening condition corresponding to the differential pressure equalization, but the equalization trigger condition corresponding to the capacity equalization is different from the capacity equalization The corresponding equalization opening conditions are the same.

Exemplarily, for another example, the equalization trigger condition corresponding to the pressure difference equalization is different from the equalization opening condition corresponding to the pressure difference equalization, and the equalization trigger condition corresponding to the capacity equalization is different from the capacity The equalization opening conditions corresponding to the equalization are also different.

Specifically, it is determined according to the state of charge whether the battery cell satisfies the equalization trigger condition of pressure difference equalization and the equalization trigger condition of capacity equalization, and whether the battery cell meets the corresponding pressure difference equalization is determined according to the state of charge. Balanced opening conditions and balanced opening conditions corresponding to capacity balancing.

Exemplarily, it may be specifically determined according to the state of charge whether the battery cell satisfies the equalizing trigger condition of the pressure difference equalization; if the battery cell does not meet the equalizing trigger condition of the voltage difference equalization, then according to the charge The state determines whether the battery cell satisfies the equalization trigger condition of the capacity equalization.

In some embodiments, step S101 to step S103 may not be limited to specific application scenarios. For example, when the battery is installed in a movable platform, but the battery is no longer working, or the battery is left in an external environment, the battery is placed in a storage environment, and the battery is placed in a charging box. In some embodiments, it is not limited to specific application scenarios, as long as the equalization trigger condition or the equalization start condition is satisfied, it is possible to perform equalization or start equalization.

In some embodiments, it may be judged whether the battery cell satisfies the equilibrium opening condition first, that is, before the equilibrium trigger condition satisfied by the battery cell is determined according to the state of charge, the battery cell may also be determined according to the state of charge. Whether the balance opening condition is satisfied; if the battery cell satisfies the balance opening condition, determine the balance trigger condition that the battery cell satisfies according to the state of charge; if the battery cell does not meet the balance opening condition, continue Get the state of charge of multiple cells in the battery.

In some embodiments, in order to further improve the accuracy and effect of equalization. The balance trigger condition of the capacity balance includes a first capacity trigger condition and a second capacity trigger condition, and the first capacity trigger condition and the second capacity trigger condition are different.

Correspondingly, when performing capacity balance on the battery cell according to the balance trigger condition, specifically, when the battery cell satisfies the first capacity trigger condition, the balance time of the battery cell may be obtained, and the balance time of the battery cell may be obtained in the When the battery cell satisfies the second capacity trigger condition, perform capacity balance on the battery cell according to the balance time. According to the first capacity triggering condition and the second capacity triggering condition, the equalization time can be determined first, and when the equalization needs to be turned on, the capacity equalization is performed on the cells according to the equalization time, thereby improving the accuracy and efficiency of the capacity balancing.

In some embodiments, in order to quickly obtain the equalization time, the equalization efficiency is improved. To obtain the equalization time of the battery cell, specifically, a preset equalization time period may be obtained, and the preset equalization time period is used as the equalization time. Among them, the preset equalization duration is related to the battery, for example, related to the material of the battery, and the preset equalization durations of batteries of different materials are different.

In some other embodiments, in order to obtain the equalization time quickly and accurately, so as to improve the equalization accuracy. Obtain the equalization time of the battery cell, specifically obtain the capacity of the battery cell, and then obtain the equalization current corresponding to the capacity equalization of the battery cell, and determine the battery according to the capacity of the battery cell and the equalization current. The equalization time of the core, that is, the capacity of the battery cell is divided by the corresponding equalization current to get the equalization time.

In some embodiments, it may be determined whether the battery cell satisfies the equalization trigger condition corresponding to the pressure difference equalization according to the first charge threshold value. Specifically, it can be determined whether the state of charge is greater than the first charge threshold; if the state of charge is greater than the first charge threshold, it is determined that the battery cell satisfies the equalization trigger condition of the pressure difference equalization; if the charge If the electric state is not greater than the first charge threshold, it is determined that the battery cell does not satisfy the equalization trigger condition of the equalization of the pressure difference.

For example, the first charge threshold value is SOC_highlimit, and when the state of charge SOC of the battery cell is greater than the SOC_highlimit, it is determined that the battery cell satisfies the equalization trigger condition of the pressure difference equalization, and then the voltage difference equalization is performed on the battery cell; When the state of charge SOC of the battery cell is less than or equal to the SOC_highlimit, it is determined that the battery cell does not meet the equalization trigger condition of the pressure difference equalization, and then the pressure difference equalization is not performed.

It is understandable that the first charge threshold SOC_highlimit can also be used to determine whether the battery cell meets the equalization opening condition corresponding to the differential pressure equalization, that is, if the state of charge SOC of the battery is greater than the first charge threshold SOC_highlimit, it is determined The battery cell satisfies the balanced opening condition of the pressure difference equalization; if the state of charge SOC of the battery cell is not greater than the first charge threshold SOC_highlimit, it is determined that the battery cell does not satisfy the balanced opening condition of the pressure difference equalization condition.

In practical applications, the first charge threshold SOC_highlimit can be used to indicate that the battery is near a fully charged state, and the first charge threshold SOC_highlimit can be used to start the differential pressure equalization judgment and execution. As a result, pressure difference equalization can be used for equalization near the full charge point of the battery, and the influence of the capacity difference between the cells on the equalization accuracy can be ignored, thereby improving the equalization accuracy and equalization effect.

Preferably, the equalization opening condition of the differential pressure equalization can also be determined by other charge thresholds, thereby realizing the open judgment and execution decoupling of the differential pressure equalization, thereby increasing the scenario of battery equalization opening, and other charging thresholds can be specifically It is a charge threshold value different from SOC_highlimit, and the specific value is not limited here.

In some embodiments, it may be determined whether the battery cell meets the equalization trigger condition corresponding to the capacity balance according to the second charge threshold value, and specifically it may be determined whether the charge state is greater than the second charge threshold value; if the charge state is greater than the first charge state If the state of charge is not greater than the second charge threshold, it is determined that the battery cell does not satisfy the balance trigger of the capacity balance. condition.

For example, the second charge threshold is SOC_lowlimit. When the state of charge SOC of the battery cell is greater than the SOC_lowlimit, it is determined that the battery cell meets the balance trigger condition of the capacity balance, and the capacity balance is performed on the battery cell; When the state of charge SOC of the core is less than or equal to the SOC_lowlimit, it is determined that the battery does not satisfy the equalization trigger condition of the capacity equalization, and the capacity equalization is not performed.

In practical applications, the second charge threshold SOC_lowlimit can be set to a lower power level, so when the power level is low, there is no need to balance, and at the same time, it can ensure that the capacity is balanced in a larger SOC range, thereby increasing the battery's The scene is evenly turned on, thereby improving the accuracy of the battery balance.

Wherein, the equalization opening condition corresponding to the capacity equalization can also be determined according to the second charge threshold. However, in order to realize the equalization opening judgment and the decoupling of the equalization execution, preferably, other than the second charge threshold can be used. The charge threshold is determined, thereby increasing the scene of equalization on.

Exemplarily, for example, the balance opening condition of the capacity balance may be determined according to the third charge threshold, that is, it is determined whether the charge state is greater than the third charge threshold; if the charge state is greater than the third charge threshold, The electrical threshold determines that the battery cell satisfies the equalized turn-on condition; if the state of charge is less than or equal to the third charge threshold value, it is determined that the battery cell does not meet the equalized turn-on condition.

For example, the third charge threshold is expressed as SOC_mediumlimit, that is, when the state of charge of the battery cell is greater than the third charge threshold SOC_mediumlimit, it is determined that the battery satisfies the equalization opening condition of the capacity balance, and whether the battery is required Balance open judgment.

Specifically, when the state of charge is greater than the third charge threshold, it may be determined that the battery cell satisfies the equalization opening condition corresponding to the capacity balance, and the capacity opening of the battery cell is equalized according to the equalization opening condition to obtain the The balance time of the battery cell; and when the state of charge is greater than the second charge threshold, it is determined that the battery cell satisfies the balance trigger condition corresponding to the capacity balance, and the capacity balance is performed on the battery cell, that is, according to the balance Time performs capacity equalization on the cells, thereby improving equalization efficiency.

For example, for capacity balance, the SOC interval corresponding to the balance opening condition is [SOC_mediumlimit, 100%], and the SOC interval corresponding to the balance trigger bar is [SOC_lowlimit, 100%], which can ensure the balance accuracy while increasing Open the scene. Because the larger the general SOC, the higher the accuracy of the corresponding equalization, so the SOC interval corresponding to the equalization opening condition is set higher. At this time, the required equalization time is obtained and the required equalization time is saved. If the battery is discharged to SOC1 (SOC1 >SOC_lowlimit), to meet the balance trigger condition, and use the required balance time saved in advance to continue the balance. As a result, the decoupling of the balance opening judgment and the balance execution is realized.

In some embodiments, the first charge threshold is greater than the third charge threshold, and the third charge threshold is greater than the second charge threshold. The first charge threshold may correspond to the equalization trigger condition and/or the equalization opening condition of the pressure difference equalization, the second charge threshold corresponds to the equalization opening condition of the capacity equalization, and the third charge threshold corresponds to the equalization trigger condition of the capacity equalization. Therefore, it is realized that when the power is high, the impact of the capacity difference on the equalization accuracy can be ignored, and at the same time, the scenario where the capacity equalization is turned on can be increased, thereby relatively improving the equalization accuracy.

In some embodiments, the first charge threshold, the second charge threshold, and/or the third charge threshold may be set to a fixed value. For example, the first charge threshold, the second charge threshold, and/or the third charge threshold of the same type of battery are fixed or the same, and the first charge threshold, the second charge threshold, and the The third charge threshold may be different.

In some embodiments, in order to improve the accuracy and effect of equalization, the size of the first charge threshold, the second charge threshold, and the third charge threshold may be adjusted according to the difference in the capacity of the battery cells, so as to have Cells with different capacities correspond to different first charge threshold, second charge threshold, and third charge threshold. As a result, the scene of the balance opening of the battery and the balance accuracy are increased.

In some embodiments, in order to further improve the equalization effect, when performing equalization on the battery cells, including capacity equalization and pressure difference equalization, the battery temperature can also be controlled to be substantially constant. Specifically, the heating device in the battery may be controlled to heat the battery when the battery cell is equalized, so that the battery temperature is substantially constant. The power management device can also be used to communicate with the battery. After determining the current temperature of the battery and determining that the cells of the battery are performing equalization, the heating device is controlled to heat the battery of the battery so that The battery temperature is basically constant.

In some embodiments, in order to increase the user experience, it is also possible to obtain equalization information corresponding to the equalization performed on the battery cell, and output the equalization information. Wherein, the equalization information includes equalization time, equalization type, and battery temperature when performing equalization, etc., and the equalization type includes differential pressure equalization and capacity equalization.

For example, the equalization information corresponding to the equalization performed on the battery cell is obtained, and the equalization information is output. Specifically, the equalization information may be displayed on a display, or the equalization information may be broadcasted by voice. Or, when the battery is used/opened next time, the control terminal in communication with the battery pushes the corresponding equalization information when performing equalization before the battery cell.

In some embodiments, in order to let the user know whether the balance is abnormal, and to increase the user's experience, it is also possible to monitor and obtain abnormal information when the battery cell is equalized, and prompt according to the abnormal information. Among them, the abnormal information includes equalization failure and excessive temperature during equalization. For example, the excessive temperature is that the battery temperature exceeds a preset threshold during equalization.

For example, monitoring and obtaining abnormal information when performing equalization on the battery cell, and prompting according to the abnormal information, specifically, the abnormal information may be displayed by the indicator light, or the abnormal information may be displayed on the display, or voice Broadcast the abnormal information.

The battery equalization control method provided by the above embodiments realizes the decoupling of equalization start judgment and equalization execution, as well as the combination of pressure difference equalization and capacity equalization, thereby increasing the scenario of equalization opening. Compared with the existing equalization strategy, Improved equalization accuracy and equalization effect.

Please refer to FIG. 6, which is a schematic flowchart of steps of a battery balancing method provided by an embodiment of the present application. The equalization method is applied to smart batteries, and is used to equalize the cells of the battery, so as to improve the equalization accuracy and equalization effect, and thereby increase the service life of the battery.

As shown in FIG. 6, the equalization method includes step S201 to step S203.

S201. Obtain the state of charge of multiple cells in the battery;

S202: Determine, according to the state of charge, an equilibrium trigger condition that the battery cell satisfies;

S203: Perform pressure difference equalization or capacity equalization on the battery cell according to the equalization trigger condition satisfied by the battery cell.

Wherein, the equalization trigger condition includes the equalization trigger condition of pressure difference equalization and the equalization trigger condition of capacity equalization, and the priority of the pressure difference equalization is higher than the priority of the capacity equalization, that is, both the pressure difference equalization and the capacity equalization are satisfied. The trigger condition of the priority is to perform pressure equalization first.

Wherein, according to the equalization trigger condition that the battery cell satisfies, the voltage difference equalization or the capacity equalization is performed on the battery cell, specifically if the battery cell satisfies the equalization trigger condition of the capacity equalization and satisfies the voltage difference equalization If the battery cell meets the equalizing trigger condition of the capacity equalization and does not meet the equalizing trigger condition of the voltage equalization, the voltage equalization is performed on the battery cell. balanced.

In some embodiments, before the determination of the equilibrium trigger condition that the battery cell satisfies according to the state of charge, it may be determined whether the battery cell satisfies the equilibrium activation condition according to the state of charge; If the cell satisfies the equalization opening condition, determine the equalization trigger condition that the cell satisfies according to the state of charge; if the cell does not meet the equalization opening condition, continue to obtain the charge of multiple cells in the battery state.

It should be noted that the equalization opening condition is different from the equalization trigger condition. The equalization trigger condition is used to trigger the battery to perform equalization, and the equalization opening condition is used to turn on the battery cells to determine whether the battery cells are in balance. The equalization trigger condition includes the equalization trigger condition corresponding to the pressure difference equalization and the equalization trigger condition corresponding to the capacity equalization; the equalization opening condition includes the equalization opening condition corresponding to the pressure difference equalization and the equalization opening condition corresponding to the capacity equalization.

In some embodiments, the balance trigger condition of the capacity balance includes a first capacity trigger condition and a second capacity trigger condition; accordingly, if the battery cell satisfies the balance trigger condition of the capacity balance, the battery cell Perform capacity balance, specifically, when the battery cell meets the first capacity trigger condition, obtain the balance time of the battery cell; and when the battery cell meets the second capacity trigger condition, according to the balance Time to perform capacity equalization on the battery cell. It is possible to increase the scene where the equalization is turned on, and at the same time further improve the accuracy and effect of the equalization.

Wherein, obtaining the equalization time of the battery cell specifically includes two methods. The first method is to obtain a preset equalization time length, and the preset equalization time period is used as the equalization time; The battery cell performs the equalization current corresponding to the capacity equalization, and then determines the equalization time of the battery cell according to the capacity of the battery cell and the equalization current, that is, the capacity of the battery cell is divided by the equalization current to obtain the Balance time.

Wherein, determining the balance trigger condition satisfied by the battery cell according to the state of charge includes determining the balance trigger condition corresponding to the voltage difference balance and the capacity balance satisfied by the battery core.

Exemplarily, it can be specifically determined whether the state of charge is greater than a first charge threshold, and if the state of charge is greater than the first charge threshold, it is determined that the battery cell satisfies the equalization trigger condition of the pressure difference equalization.

In practical applications, the first charge threshold SOC_highlimit can be used to indicate that the battery is near a fully charged state, and the first charge threshold can be used to start the differential pressure equalization judgment and execution. As a result, pressure difference equalization can be used for equalization near the full charge point of the battery, and the influence of the capacity difference between the cells on the equalization accuracy can be ignored, thereby improving the equalization accuracy and equalization effect.

Exemplarily, it can be specifically determined whether the state of charge is greater than the second charge threshold; if the state of charge is greater than the second charge threshold, it is determined if the battery cell satisfies the balance trigger condition of the capacity balance.

In some embodiments, it is determined that the battery cell satisfies the equilibrium opening condition, specifically whether the state of charge is greater than a third charge threshold; if the state of charge is greater than the third charge threshold, determine The battery cell satisfies the balanced turn-on condition; if the state of charge is less than or equal to the third charge threshold, it is determined that the battery cell does not meet the balanced turn-on condition.

Wherein, the first charge threshold is greater than the third charge threshold, and the third charge threshold is greater than the second charge threshold.

In some embodiments, the balance trigger condition that the battery cell satisfies is determined according to the state of charge, and the capacity balance is performed on the battery cell according to the balance trigger condition, specifically: when the state of charge is greater than all When the third charge threshold is used, obtain the balance time of the battery cell; and when the charge state is greater than the second charge threshold, perform capacity balance on the battery cell according to the balance time. Open the scene to increase the capacity balance.

Specifically, when the state of charge is greater than the third charge threshold, it may be determined that the battery cell satisfies the equalization opening condition corresponding to the capacity balance, and the judgment of the opening capacity equalization of the battery cell according to the equalization opening condition can be used to Obtain the balance time of the battery cell; and when the state of charge is greater than the second charge threshold, determine that the battery cell meets the balance trigger condition corresponding to the capacity balance, and perform the capacity balance on the battery cell, that is, according to all The balancing time performs capacity balancing on the battery cell.

For example, for capacity balance, the SOC interval corresponding to the balance opening condition is [SOC_mediumlimit, 100%], and the SOC interval corresponding to the balance trigger bar is [SOC_lowlimit, 100%], which can ensure the balance accuracy while increasing Open the scene. Because the larger the general SOC, the higher the accuracy of the corresponding equalization, so the SOC interval corresponding to the equalization opening condition is set higher. At this time, the required equalization time is obtained and the required equalization time is saved. If the battery is discharged to SOC1 (SOC1 >SOC_lowlimit), to meet the balance trigger condition, and use the required balance time saved in advance to continue the balance. This realizes the decoupling of balanced start judgment and balanced execution.

In some embodiments, in order to improve the balance accuracy, the charge threshold may be dynamically adjusted, for example, according to the difference in the capacity of the battery cells, the first charge threshold, the second charge threshold, and the third charge threshold are adjusted. .

In some embodiments, in order to improve the equalization effect, it is also possible to control the battery temperature to be substantially constant when the battery cell is equalized. Specifically, when balancing the battery cells, controlling the heating device to heat the battery so that the battery temperature is substantially constant.

Alternatively, the battery is provided with a power management device, the power management device is configured to communicate with the battery, the power management device is provided with a heating device, and the heating device is controlled when the electric core is equalized The battery is heated so that the temperature of the battery is substantially constant.

In some embodiments, in order to increase the user experience. It is also possible to obtain equalization information corresponding to the equalization performed on the battery cell, and output the equalization information, for example, display the equalization information. Or, monitor and obtain abnormal information when performing equalization on the battery cell, and prompt according to the abnormal information, such as displaying the abnormal information through an indicator light.

The battery equalization control method provided by the foregoing embodiments realizes the combination of differential pressure equalization and capacity equalization for equalization, and at the same time, preferential use of differential pressure equalization, which can improve equalization accuracy and equalization effect compared to existing equalization strategies.

Please refer to FIG. 7, which is a schematic flowchart of steps of a battery balancing method provided by an embodiment of the present application. The equalization method is applied to smart batteries, and is used to equalize the cells of the battery, so as to improve the equalization accuracy and equalization effect, and thereby increase the service life of the battery.

As shown in Fig. 7, the equalization method includes step S301 to step S304.

S301. Obtain the state of charge of multiple cells in the battery;

S302: Determine an equalization trigger condition that the battery cell satisfies according to the state of charge, where the equalization trigger condition includes an equalization trigger condition for pressure difference equalization and an equalization trigger condition for capacity equalization;

S303: If the battery cell satisfies the equalization trigger condition of the voltage difference equalization, perform the voltage difference equalization on the battery cell;

S304: If the battery cell satisfies the balance trigger condition of the capacity balance, perform capacity balance on the battery cell.

It should be noted that the equalization opening condition is different from the equalization trigger condition. The equalization trigger condition is used to trigger the battery to perform equalization, and the equalization opening condition is used to turn on the battery cells to determine whether the battery cells are in balance.

In some embodiments, the balance trigger condition of the capacity balance includes a first capacity trigger condition and a second capacity trigger condition.

Correspondingly, if the battery cell satisfies the balance trigger condition of the capacity balance, the capacity balance is performed on the battery cell. Specifically, when the battery cell satisfies the first capacity trigger condition, the battery cell's Balance time; and when the battery cell meets the second capacity trigger condition, perform capacity balance on the battery cell according to the balance time. It is possible to increase the scene where the equalization is turned on, and at the same time further improve the accuracy and effect of the equalization.

Wherein, obtaining the equalization time of the battery cell may specifically obtain a preset equalization duration, and use the preset equalization duration as the equalization time. Of course, it is also possible to obtain the capacity of the cell first and then obtain the equalizing current corresponding to the capacity equalization of the cell, and then determine the equalizing time of the cell according to the capacity of the cell and the equalizing current, that is, The capacity of the battery cell is divided by the equalizing current to obtain the equalizing time.

In some embodiments, in order to increase the equalization effect, it is also possible to control the battery temperature to be substantially constant when the battery cell is equalized. Specifically, when balancing the battery cells, controlling the heating device to heat the battery so that the battery temperature is substantially constant.

The battery equalization control method provided by the foregoing embodiments realizes the combination of differential pressure equalization and capacity equalization for equalization, and can improve equalization accuracy and equalization effect compared with the existing equalization strategy.

Please refer to FIG. 8, which is a schematic flowchart of steps of a battery balancing method provided by an embodiment of the present application. The equalization method is applied to smart batteries, and is used to equalize the cells of the battery, so as to improve the equalization accuracy and equalization effect, and thereby increase the service life of the battery.

As shown in FIG. 8, the equalization method includes step S401 to step S403.

S401. Obtain the state of charge of multiple cells in the battery;

S402. Determine an equalization trigger condition satisfied by the battery cell according to the state of charge, and determine an equalization opening condition satisfied by the battery cell according to the state of charge, wherein the equalization trigger condition is different from the equalization opening condition ；

S403. The electrical properties are equalized according to the equalization trigger condition, and the battery core is turned on and equalized according to the equalization opening condition.

Wherein, the equalization opening condition is different from the equalization trigger condition, the equalization trigger condition is used to trigger the battery to perform equalization, and the equalization opening condition is used to turn on the battery cells to determine whether the battery cells are in balance.

Specifically, according to the state of charge, determine the balanced opening condition that the battery cell satisfies, and if the battery cell satisfies the balanced opening condition, the battery cell is opened and balanced according to the balanced opening condition; according to the charge The electrical state determines the balance trigger condition that the battery cell satisfies, and if the balance trigger condition the battery cell satisfies, the electrical properties are balanced according to the balance trigger condition.

Wherein, the balance trigger condition is different from the balance turn-on condition, for example, different charge thresholds are used to determine the balance trigger condition satisfied by the battery cell and the balance turn-on condition satisfied by the battery cell.

It can be understood that the equalization trigger condition includes the equalization trigger condition of pressure difference equalization and the equalization trigger condition of capacity equalization, and the equalization opening condition includes the equalization opening condition of pressure difference equalization and the equalization opening condition of capacity equalization.

It should be noted that this embodiment provides a battery balancing method. For details, reference may be made to the balancing methods of the foregoing embodiments, which will not be described in detail here.

In summary, the battery equalization method provided in this embodiment realizes the decoupling of equalization start judgment and equalization execution, thereby increasing the application scenarios of equalization, and also improving the accuracy and effect of equalization.

Please refer to FIG. 9, which is a schematic block diagram of a smart battery provided by an embodiment of the present application. The smart battery 20 includes a plurality of battery cells 201, an equalization circuit 202, and a control circuit 21. The control circuit 21 includes a processor 211 and a memory 212. The processor 211 and the memory 212 are connected by a communication bus, such as an I2C bus.

Wherein, the equalization circuit 202 is connected to the battery core 201 and is used to equalize the battery core 201; the control circuit 21 is connected to the equalization circuit 202 and is used to control the equalization circuit 202 to perform equalization on the battery core 201.

Specifically, the processor 211 may be a micro-controller unit (MCU), a central processing unit (CPU), a digital signal processor (Digital Signal Processor, DSP), or the like.

Specifically, the memory 212 may be a Flash chip, a read-only memory (ROM, Read-Only Memory) disk, an optical disk, a U disk, or a mobile hard disk.

Wherein, the processor is used to run a computer program stored in a memory, and when executing the computer program, implement any one of the battery balancing methods provided in the embodiments of the present application.

Exemplarily, the processor is configured to run a computer program stored in a memory, and implement the following steps when the computer program is executed:

Obtain the state of charge of a plurality of cells in the battery; determine the equalization trigger condition that the cell satisfies according to the state of charge, and perform pressure difference equalization or capacity equalization on the cell according to the equalization trigger condition; and , Determining the equalizing opening condition that the battery cell satisfies according to the state of charge, and opening the battery cell according to the equalizing opening condition to equalize the voltage difference or the capacity; wherein the equalization corresponding to the equalization of the voltage difference The trigger condition is different from the equalization opening condition, and/or, the equalization trigger condition corresponding to the capacity equalization is different from the equalization opening condition.

In some embodiments, before the determining the equalization trigger condition satisfied by the battery cell according to the state of charge, the processor further implements:

According to the state of charge, it is determined whether the battery cell satisfies the equilibrium opening condition; if the battery cell satisfies the equilibrium opening condition, the equilibrium trigger condition that the battery cell satisfies is determined according to the state of charge.

In some embodiments, after the determining whether the battery cell satisfies a balanced turn-on condition according to the state of charge, the processor further implements:

If the battery cell does not meet the balanced opening condition, continue to obtain the state of charge of the multiple battery cells in the battery.

In some embodiments, the balance trigger condition of the capacity balance includes a first capacity trigger condition and a second capacity trigger condition;

Correspondingly, the performing pressure difference equalization or capacity equalization on the battery cell according to the equalization trigger condition includes: obtaining the equalization time of the battery cell when the battery cell satisfies the first capacity trigger condition; And when the battery cell satisfies the second capacity trigger condition, perform capacity balance on the battery cell according to the balance time.

In some embodiments, the obtaining the equalization time of the battery cell includes: obtaining a preset equalization duration, and using the preset equalization duration as the equalization time.

In some embodiments, the obtaining the equilibrium time of the battery cell includes:

Obtaining the capacity of the battery cell; obtaining the equalizing current corresponding to the capacity equalization of the battery cell; determining the equalizing time of the battery cell according to the capacity of the battery cell and the equalizing current.

In some embodiments, the processor further implements:

It is determined whether the state of charge is greater than a first charge threshold; if the state of charge is greater than the first charge threshold, it is determined that the battery cell satisfies the equalization trigger condition of the pressure difference equalization.

In some embodiments, the processor further implements:

It is determined whether the state of charge is greater than a second threshold of charge; if the state of charge is greater than the second threshold of charge, it is determined that the battery cell satisfies the equalization trigger condition of the capacity equalization.

In some embodiments, the determining the balance trigger condition that the battery cell satisfies according to the state of charge, and performing capacity balance on the battery cell according to the balance trigger condition includes:

When the state of charge is greater than the third charge threshold, obtain the equilibrium time of the battery cell; and when the state of charge is greater than the second charge threshold, compare the equilibrium time to the The battery cell performs capacity balancing.

In some embodiments, the first charge threshold is greater than the third charge threshold, and the third charge threshold is greater than the second charge threshold.

In some embodiments, the processor further implements:

Determine whether the state of charge is greater than the third threshold of charge; if the state of charge is greater than the third threshold of charge, determine that the battery cell satisfies the equalization opening condition; if the state of charge is less than or equal to The third charge threshold value determines that the battery cell does not satisfy the equalizing opening condition.

In some embodiments, the processor further implements:

Adjust the size of the first charge threshold, the second charge threshold, and the third charge threshold according to the difference in the capacity of the battery cells.

In some embodiments, the obtaining the state of charge of multiple cells in the battery includes:

After the battery is allowed to stand for a first preset period of time, the open circuit voltages of a plurality of cells in the battery are obtained; and the state of charge of the cells is determined according to the open circuit voltage.

In some embodiments, each cell of the battery corresponds to a second preset duration, and the second preset duration of the plurality of cells is the same or different;

Correspondingly, the obtaining the state of charge of the multiple cells in the battery includes:

After each cell in the battery is allowed to stand for a second preset period of time corresponding to the cell, the open circuit voltage of the cell is obtained; the charge of the cell is determined according to the open circuit voltage of the cell state.

In some embodiments, the determining the equilibrium trigger condition satisfied by the battery cell according to the state of charge includes:

According to the state of charge, it is determined whether the battery cell meets the equalization trigger condition of the pressure difference equalization; if the battery cell does not meet the equalization trigger condition of the pressure difference equalization, the battery cell is determined according to the state of charge Whether the balance trigger condition of capacity balance is met.

In some embodiments, the processor further implements: controlling the battery temperature to be substantially constant when performing equalization on the battery cells.

In some embodiments, the processor further implements: when performing equalization on the battery cells, controlling the heating device to heat the battery, so that the battery temperature is substantially constant.

In some embodiments, the battery is provided with a power management device, the power management device is configured to communicate with the battery, and the power management device is provided with a heating device;

Correspondingly, the processor further realizes: when performing equalization on the battery cells, controlling the heating device to heat the battery so that the battery temperature is substantially constant.

In some embodiments, the processor further implements: obtaining equalization information corresponding to performing equalization on the battery cell, and outputting the equalization information.

In some embodiments, the processor further implements: monitoring and acquiring abnormal information when performing equalization on the battery cell, and prompting according to the abnormal information.

Acquiring the state of charge of a plurality of cells in the battery; determining an equalization trigger condition that the cell satisfies according to the state of charge, and the equalization trigger condition includes an equalization trigger condition for pressure difference equalization and an equalization trigger condition for capacity equalization, The priority of the pressure difference equalization is higher than the priority of the capacity equalization; and the voltage difference or the capacity equalization is performed on the battery cell according to the equalization trigger condition satisfied by the battery cell.

In some embodiments, the performing voltage difference equalization or capacity equalization on the battery cell according to the equalization trigger condition satisfied by the battery cell includes:

If the battery cell satisfies the balance trigger condition of the capacity balance and the balance trigger condition of the voltage difference balance is satisfied, the voltage difference balance is performed on the battery cell; if the battery cell satisfies the balance trigger of the capacity balance Condition, and the equalization trigger condition of the pressure difference equalization is not satisfied, and the capacity equalization is performed on the battery cell.

In some embodiments, the determining whether the battery cell satisfies a balanced turn-on condition according to the state of charge, the processor further implements:

Correspondingly, if the battery cell satisfies the balance trigger condition of the capacity balance, performing capacity balance on the battery cell includes:

When the battery cell satisfies the first capacity trigger condition, obtain the equilibrium time of the battery cell; and when the battery cell satisfies the second capacity trigger condition, compare the battery cell with the equilibrium time Perform capacity balancing.

In some embodiments, the obtaining the balance time of the battery cell includes: obtaining the capacity of the battery cell; obtaining the balance current corresponding to the capacity balance of the battery cell; The equalizing current determines the equalizing time of the battery cell.

In some embodiments, the processor further implements: determining whether the state of charge is greater than a first charge threshold; if the state of charge is greater than the first charge threshold, determining that the battery cell satisfies the voltage The equalization trigger condition of the poor equalization.

In some embodiments, the processor further implements: determining whether the state of charge is greater than a second charge threshold; if the state of charge is greater than the second charge threshold, determining if the battery cell satisfies the Balance trigger condition for capacity balance.

In some embodiments, the processor further implements: determining whether the state of charge is greater than a third charge threshold; if the state of charge is greater than the third charge threshold, determining that the battery cell satisfies the Balance opening condition; if the state of charge is less than or equal to the third charge threshold, it is determined that the battery cell does not satisfy the balance opening condition.

In some embodiments, the processor further implements: adjusting the size of the first charge threshold, the second charge threshold, and the third charge threshold according to the difference in the capacity of the battery cells.

In some embodiments, the battery is provided with a heating device, and the processor further implements: when performing equalization on the battery cell, controlling the heating device to heat the battery so that the battery temperature is substantially constant.

In some embodiments, the battery is provided with a power management device, the power management device is configured to communicate with the battery, the power management device is provided with a heating device, and the processor further implements:

When performing equalization on the battery cell, the heating device is controlled to heat the battery so that the battery temperature is substantially constant.

Acquiring the state of charge of a plurality of cells in the battery; determining an equalization trigger condition that the cell satisfies according to the state of charge, and the equalization trigger condition includes an equalization trigger condition for pressure difference equalization and an equalization trigger condition for capacity equalization; If the battery cell satisfies the equalization trigger condition of the pressure difference equalization, the voltage difference equalization is performed on the battery cell; if the battery cell meets the equalization trigger condition of the capacity equalization, the capacity equalization is performed on the battery cell.

In some embodiments, the processor further implements: determining whether the state of charge is greater than a second threshold of charge; if the state of charge is greater than the second threshold of charge, determining that the battery cell meets the capacity Balanced balance trigger conditions.

Obtain the state of charge of a plurality of cells in the battery; determine the equilibrium trigger condition satisfied by the cell according to the state of charge, and determine the equilibrium activation condition satisfied by the cell according to the state of charge, wherein the The equalization trigger condition is different from the equalization opening condition; and the electrical properties are equalized according to the equalization trigger condition, and the battery core is equalized according to the equalization opening condition.

The embodiment of the present application also provides a charging system. As shown in FIG. 1, the charging system 100 includes a charger 10 and a smart battery 20 as described in any of the above embodiments. The charger 10 is used for charging The smart battery 20 is charged, and the smart battery 20 is used to power the electronic device.

Wherein, the smart battery 20 executes any of the balancing methods provided in the embodiments of the present application during the charging or discharging process. Since the balancing method can improve the balancing accuracy and the balancing effect, the service life of the smart battery 20 can be increased. At the same time, the safety of the battery can be improved.

The embodiments of the present application also provide a computer-readable storage medium, the computer-readable storage medium stores a computer program, the computer program includes program instructions, and the processor executes the program instructions to implement the foregoing implementation Examples provide the steps of any of the so-called equalization methods.

Wherein, the computer-readable storage medium may be the internal storage unit of the smart battery described in any of the foregoing embodiments, for example, the memory or internal memory of the smart battery. The computer-readable storage medium may also be an external storage device of the smart battery, such as a plug-in hard disk equipped on the smart battery, a smart memory card (Smart Media Card, SMC), or Secure Digital (SD) ) Card, Flash Card, etc.

The above are only specific implementations of this application, but the protection scope of this application is not limited to this. Any person skilled in the art can easily think of various equivalents within the technical scope disclosed in this application. Modifications or replacements, these modifications or replacements shall be covered within the protection scope of this application. Therefore, the protection scope of this application shall be subject to the protection scope of the claims.

Claims

A method for balancing a battery, characterized in that the battery includes a plurality of battery cells, and the balancing method includes:

Obtain the state of charge of multiple cells in the battery;

Determine the equalization trigger condition that the battery cell satisfies according to the state of charge, and perform pressure difference equalization or capacity equalization on the battery cell according to the equalization trigger condition; and,

Determining the equalized turn-on condition that the battery cell satisfies according to the state of charge, and turn on the voltage difference equalization or the capacity equalization of the battery core according to the equalized turn-on condition;

Wherein, the equalization trigger condition corresponding to the pressure difference equalization is different from the equalization opening condition, and/or the equalization trigger condition corresponding to the capacity equalization is different from the equalization opening condition.
The method according to claim 1, characterized in that, before determining the equilibrium trigger condition satisfied by the battery cell according to the state of charge, the method further comprises:

Determining whether the battery cell satisfies a balanced turn-on condition according to the state of charge;

If the battery cell satisfies the balance opening condition, the balance trigger condition that the battery cell satisfies is determined according to the state of charge.
The method according to claim 2, wherein after the determining whether the battery cell satisfies a balanced turn-on condition according to the state of charge, the method further comprises:

If the battery cell does not meet the balanced opening condition, continue to obtain the state of charge of the multiple battery cells in the battery.
The method according to claim 1, wherein the balance trigger condition of the capacity balance comprises a first capacity trigger condition and a second capacity trigger condition;

The performing pressure difference equalization or capacity equalization on the battery cell according to the equalization trigger condition includes:

When the battery cell satisfies the first capacity trigger condition, obtaining the equilibrium time of the battery cell;

And when the battery cell satisfies the second capacity trigger condition, perform capacity balance on the battery cell according to the balance time.
The method according to claim 4, wherein the obtaining the equilibrium time of the battery cell comprises:

Obtain the preset equalization duration, and use the preset equalization duration as the equalization time.
The method according to claim 4, wherein the obtaining the equilibrium time of the battery cell comprises:

Obtaining the capacity of the battery cell;

Obtaining an equalizing current corresponding to the capacity equalization of the battery cell;

The balance time of the battery core is determined according to the capacity of the battery core and the balance current.
The method according to claim 1, wherein the method comprises:

Determining whether the state of charge is greater than a first charge threshold;

If the state of charge is greater than the first charge threshold, it is determined that the battery cell satisfies the equalization trigger condition of the pressure difference equalization.
The method according to claim 7, wherein the method comprises:

Determining whether the state of charge is greater than a second charge threshold;

If the state of charge is greater than the second charge threshold, it is determined that the battery cell satisfies the equalization trigger condition of the capacity equalization.
The method according to claim 8, wherein the determining an equalization trigger condition satisfied by the battery cell according to the state of charge, and performing capacity equalization on the battery cell according to the equalization trigger condition, comprises:

When the state of charge is greater than a third charge threshold, obtaining the equilibrium time of the battery cell;

And when the state of charge is greater than the second charge threshold value, perform capacity balance on the battery cell according to the balance time.
The method of claim 9, wherein the first charge threshold is greater than the third charge threshold, and the third charge threshold is greater than the second charge threshold.
The method according to claim 1, wherein the method further comprises:

Determining whether the state of charge is greater than a third charge threshold;

If the state of charge is greater than the third charge threshold, determining that the battery cell satisfies the equalizing start condition;

If the state of charge is less than or equal to the third charge threshold value, it is determined that the battery cell does not satisfy the equalization opening condition.
The method according to claim 10, wherein the method further comprises:

Adjust the size of the first charge threshold, the second charge threshold, and the third charge threshold according to the difference in the capacity of the battery cells.
The method according to claim 1, wherein said obtaining the state of charge of a plurality of cells in the battery comprises:

Obtaining the open circuit voltage of a plurality of cells in the battery after the battery is left to stand for a first preset period of time;

The state of charge of the battery core is determined according to the open circuit voltage.
The method according to claim 1, wherein each cell of the battery corresponds to a second preset duration, and the second preset durations of the plurality of cells are the same or different;

The obtaining the state of charge of multiple cells in the battery includes:

Obtaining the open circuit voltage of the battery cell after each battery cell in the battery rests for a second preset period of time corresponding to the battery cell;

The state of charge of the battery is determined according to the open circuit voltage of the battery.
The method according to claim 1, wherein the determining an equalization trigger condition satisfied by the battery cell according to the state of charge comprises:

Determining, according to the state of charge, whether the battery cell satisfies the equalization trigger condition of the equalization of the pressure difference;

If the battery cell does not meet the equalization trigger condition of the pressure difference equalization, it is determined whether the battery cell meets the equalization trigger condition of the capacity equalization according to the state of charge.
The method according to claim 1, wherein the method further comprises:

When performing equalization on the battery cells, the temperature of the battery is controlled to be substantially constant.
The method according to claim 16, wherein the battery is provided with a heating device, and the method comprises:

When performing equalization on the battery cell, the heating device is controlled to heat the battery so that the battery temperature is substantially constant.
The method according to claim 16, wherein the battery is provided with a power management device, the power management device is configured to communicate with the battery, the power management device is provided with a heating device, and the method comprises :

When performing equalization on the battery cell, the heating device is controlled to heat the battery so that the battery temperature is substantially constant.
The method according to claim 1, wherein the method further comprises:

Obtain equalization information corresponding to performing equalization on the battery cell, and output the equalization information.
The method according to claim 1, wherein the method further comprises:

Monitor and obtain abnormal information when performing equalization on the battery cell, and prompt according to the abnormal information.
A method for balancing a battery, characterized in that the battery includes a plurality of battery cells, and the balancing method includes:

Obtain the state of charge of multiple cells in the battery;

The equalization trigger condition that the battery cell satisfies is determined according to the state of charge, the equalization trigger condition includes an equalization trigger condition for pressure difference equalization and an equalization trigger condition for capacity equalization, and the priority of the pressure difference equalization is higher than that of the Priority of capacity balancing;

According to the equalization trigger condition satisfied by the battery core, the voltage difference equalization or the capacity equalization is performed on the battery core.
22. The method according to claim 21, wherein the performing voltage difference equalization or capacity equalization on the battery cell according to the equalization trigger condition satisfied by the battery cell comprises:

If the battery cell satisfies the equalization trigger condition of the capacity equalization and the equalization trigger condition of the pressure difference equalization, perform the voltage difference equalization on the battery cell;

If the battery cell satisfies the balance trigger condition of the capacity balance and does not meet the balance trigger condition of the pressure difference balance, the capacity balance is performed on the battery cell.
22. The method according to claim 21, characterized in that, before determining the equilibrium trigger condition satisfied by the battery cell according to the state of charge, the method further comprises:

Determining whether the battery cell satisfies a balanced turn-on condition according to the state of charge;

If the battery cell satisfies the balance opening condition, the balance trigger condition that the battery cell satisfies is determined according to the state of charge.
The method according to claim 23, wherein the determining whether the battery cell satisfies a balanced turn-on condition according to the state of charge, the method further comprising:

If the battery cell does not meet the balanced opening condition, continue to obtain the state of charge of the multiple battery cells in the battery.
The method according to claim 21, wherein the balance trigger condition of the capacity balance comprises a first capacity trigger condition and a second capacity trigger condition;

If the battery cell satisfies the balance trigger condition of the capacity balance, performing capacity balance on the battery cell includes:

When the battery cell satisfies the first capacity trigger condition, obtaining the equilibrium time of the battery cell;

And when the battery cell satisfies the second capacity trigger condition, perform capacity balance on the battery cell according to the balance time.
The method according to claim 25, wherein the obtaining the equilibrium time of the battery cell comprises:

Obtain the preset equalization duration, and use the preset equalization duration as the equalization time.
The method according to claim 25, wherein the obtaining the equilibrium time of the battery cell comprises:

Obtaining the capacity of the battery cell;

Obtaining an equalizing current corresponding to the capacity equalization of the battery cell;

The balance time of the battery core is determined according to the capacity of the battery core and the balance current.
The method of claim 25, wherein the method comprises:

Determining whether the state of charge is greater than a first charge threshold;

If the state of charge is greater than the first charge threshold, it is determined that the battery cell satisfies the equalization trigger condition of the pressure difference equalization.
The method of claim 28, wherein the method comprises:

Determining whether the state of charge is greater than a second charge threshold;

If the state of charge is greater than the second charge threshold, it is determined if the battery cell satisfies the equalization trigger condition of the capacity equalization.
The method according to claim 29, wherein the determining an equalization trigger condition that the battery cell satisfies according to the state of charge, and performing capacity equalization on the battery cell according to the equalization trigger condition, comprises:

When the state of charge is greater than a third charge threshold, obtaining the equilibrium time of the battery cell;

And when the state of charge is greater than the second charge threshold value, perform capacity balance on the battery cell according to the balance time.
The method of claim 30, wherein the first charge threshold is greater than the third charge threshold, and the third charge threshold is greater than the second charge threshold.
The method according to claim 23 or 24, wherein the method further comprises:

Determining whether the state of charge is greater than a third charge threshold;

If the state of charge is greater than the third charge threshold, determining that the battery cell satisfies the equalizing start condition;

If the state of charge is less than or equal to the third charge threshold, it is determined that the battery cell does not satisfy the equalization opening condition.
The method according to claim 31, wherein the method further comprises:

Adjust the size of the first charge threshold, the second charge threshold, and the third charge threshold according to the difference in the capacity of the battery cells.
The method according to claim 21, wherein said obtaining the state of charge of a plurality of cells in the battery comprises:

Obtaining the open circuit voltage of a plurality of cells in the battery after the battery is left to stand for a first preset period of time;

The state of charge of the battery core is determined according to the open circuit voltage.
The method according to claim 21, wherein each cell of the battery corresponds to a second preset duration, and the second preset durations of the plurality of cells are the same or different;

The obtaining the state of charge of multiple cells in the battery includes:

Obtaining the open circuit voltage of the battery cell after each battery cell in the battery rests for a second preset period of time corresponding to the battery cell;

The state of charge of the battery is determined according to the open circuit voltage of the battery.
The method according to claim 21, wherein the determining the equalization trigger condition satisfied by the battery cell according to the state of charge comprises:

Determining, according to the state of charge, whether the battery cell satisfies the equalization trigger condition of the equalization of the pressure difference;

If the battery cell does not meet the equalization trigger condition of the pressure difference equalization, it is determined whether the battery cell meets the equalization trigger condition of the capacity equalization according to the state of charge.
The method according to claim 21, wherein the method further comprises:

When performing equalization on the battery cells, the temperature of the battery is controlled to be substantially constant.
The method according to claim 37, wherein the battery is provided with a heating device, and the method comprises:

When performing equalization on the battery cell, the heating device is controlled to heat the battery so that the battery temperature is substantially constant.
The method according to claim 37, wherein the battery is provided with a power management device, the power management device is configured to communicate with the battery, the power management device is provided with a heating device, and the method comprises :

When performing equalization on the battery cell, the heating device is controlled to heat the battery so that the battery temperature is substantially constant.
The method according to claim 21, wherein the method further comprises:

Obtain equalization information corresponding to performing equalization on the battery cell, and output the equalization information.
The method according to claim 21, wherein the method further comprises:

Monitor and obtain abnormal information when performing equalization on the battery cell, and prompt according to the abnormal information.
A method for balancing a battery, characterized in that the battery includes a plurality of battery cells, and the balancing method includes:

Obtain the state of charge of multiple cells in the battery;

Determining an equalization trigger condition that the battery cell satisfies according to the state of charge, where the equalization trigger condition includes an equalization trigger condition for pressure difference equalization and an equalization trigger condition for capacity equalization;

If the battery cell satisfies the equalization trigger condition of the pressure difference equalization, perform the voltage difference equalization on the battery cell;

If the battery cell satisfies the balance trigger condition of the capacity balance, the capacity balance is performed on the battery cell.
The method according to claim 42, characterized in that, before determining the equilibrium trigger condition satisfied by the battery cell according to the state of charge, the method further comprises:

Determining whether the battery cell satisfies a balanced turn-on condition according to the state of charge;

If the battery cell satisfies the balance opening condition, the balance trigger condition that the battery cell satisfies is determined according to the state of charge.
The method according to claim 43, wherein after the determining whether the battery cell satisfies a balanced turn-on condition according to the state of charge, the method further comprises:

If the battery cell does not meet the balanced opening condition, continue to obtain the state of charge of the multiple battery cells in the battery.
The method according to claim 42, wherein the balance trigger condition of the capacity balance comprises a first capacity trigger condition and a second capacity trigger condition;

If the battery cell satisfies the balance trigger condition of the capacity balance, performing capacity balance on the battery cell includes:

When the battery cell satisfies the first capacity trigger condition, obtaining the equilibrium time of the battery cell;

And when the battery cell satisfies the second capacity trigger condition, perform capacity balance on the battery cell according to the balance time.
The method according to claim 45, wherein said obtaining the equilibrium time of said battery cell comprises:

Obtain the preset equalization duration, and use the preset equalization duration as the equalization time.
The method according to claim 45, wherein said obtaining the equilibrium time of said battery cell comprises:

Obtaining the capacity of the battery cell;

Obtaining an equalizing current corresponding to the capacity equalization of the battery cell;

The balance time of the battery core is determined according to the capacity of the battery core and the balance current.
The method of claim 45, wherein the method comprises:

Determining whether the state of charge is greater than a first charge threshold;

If the state of charge is greater than the first charge threshold, it is determined that the battery cell satisfies the equalization trigger condition of the pressure difference equalization.
The method of claim 48, wherein the method comprises:

Determining whether the state of charge is greater than a second charge threshold;

If the state of charge is greater than the second charge threshold, it is determined that the battery cell satisfies the equalization trigger condition of the capacity equalization.
The method according to claim 49, wherein the determining an equalization trigger condition satisfied by the battery cell according to the state of charge, and performing capacity equalization on the battery cell according to the equalization trigger condition, comprises:

When the state of charge is greater than the third charge threshold, obtaining the equilibrium time of the battery cell;

And when the state of charge is greater than the second charge threshold value, perform capacity balance on the battery cell according to the balance time.
The method of claim 50, wherein the first charge threshold is greater than the third charge threshold, and the third charge threshold is greater than the second charge threshold.
The method according to claim 43 or 44, wherein the method further comprises:

Determining whether the state of charge is greater than a third charge threshold;

If the state of charge is greater than the third charge threshold, determining that the battery cell satisfies the equalizing start condition;

If the state of charge is less than or equal to the third charge threshold value, it is determined that the battery cell does not satisfy the equalization opening condition.
The method according to claim 51, wherein the method further comprises:

Adjust the size of the first charge threshold, the second charge threshold, and the third charge threshold according to the difference in the capacity of the battery cells.
The method according to claim 42, wherein said obtaining the state of charge of a plurality of cells in the battery comprises:

Obtaining the open circuit voltage of a plurality of cells in the battery after the battery is left to stand for a first preset period of time;

The state of charge of the battery core is determined according to the open circuit voltage.
The method according to claim 42, wherein each cell of the battery corresponds to a second preset duration, and the second preset durations of the plurality of cells are the same or different;

The obtaining the state of charge of multiple cells in the battery includes:

Obtaining the open circuit voltage of the battery cell after each battery cell in the battery rests for a second preset period of time corresponding to the battery cell;

The state of charge of the battery is determined according to the open circuit voltage of the battery.
The method according to claim 42, wherein the determining the equilibrium trigger condition satisfied by the battery cell according to the state of charge comprises:

Determining, according to the state of charge, whether the battery cell satisfies the equalization trigger condition of the equalization of the pressure difference;

If the battery cell does not meet the equalization trigger condition of the pressure difference equalization, it is determined whether the battery cell meets the equalization trigger condition of the capacity equalization according to the state of charge.
The method according to claim 42, wherein the method further comprises:

When performing equalization on the battery cells, the temperature of the battery is controlled to be substantially constant.
The method according to claim 57, wherein the battery is provided with a heating device, and the method comprises:

When performing equalization on the battery cell, the heating device is controlled to heat the battery so that the battery temperature is substantially constant.
The method of claim 57, wherein the battery is provided with a power management device, the power management device is configured to communicate with the battery, the power management device is provided with a heating device, and the method comprises :

When performing equalization on the battery cell, the heating device is controlled to heat the battery so that the battery temperature is substantially constant.
The method according to claim 42, wherein the method further comprises:

Obtain equalization information corresponding to performing equalization on the battery cell, and output the equalization information.
The method according to claim 42, wherein the method further comprises:

Monitor and obtain abnormal information when performing equalization on the battery cell, and prompt according to the abnormal information.
A method for balancing a battery, characterized in that the battery includes a plurality of battery cells, and the balancing method includes:

Obtain the state of charge of multiple cells in the battery;

Determine the equalization trigger condition satisfied by the battery cell according to the state of charge, and determine the equalization activation condition satisfied by the battery cell according to the state of charge, wherein the equalization trigger condition is different from the equalization activation condition; and

The electrical properties are equalized according to the equalization trigger condition, and the battery core is turned on and equalized according to the equalization opening condition.
A smart battery, characterized in that, the smart battery includes:

Multiple batteries;

An equalizing circuit, the equalizing circuit is connected to the battery core, and is used for equalizing the battery core;

A control circuit, the control circuit is connected to the equalization circuit, wherein the control circuit includes a processor and a memory;

The memory is used to store a computer program;

The processor is configured to execute the computer program and implement the equalization method according to any one of claims 1 to 20 when the computer program is executed.
A smart battery, characterized in that, the smart battery includes:

Multiple batteries;

An equalizing circuit, the equalizing circuit is connected to the battery core, and is used for equalizing the battery core;

A control circuit, the control circuit is connected to the equalization circuit, wherein the control circuit includes a processor and a memory;

The memory is used to store a computer program;

The processor is configured to execute the computer program and implement the equalization method according to any one of claims 21 to 41 when the computer program is executed.
A smart battery, characterized in that, the smart battery includes:

Multiple batteries;

An equalizing circuit, the equalizing circuit is connected to the battery core, and is used for equalizing the battery core;

A control circuit, the control circuit is connected to the equalization circuit, wherein the control circuit includes a processor and a memory;

The memory is used to store a computer program;

The processor is configured to execute the computer program and implement the equalization method according to any one of claims 42 to 61 when the computer program is executed.
A smart battery, characterized in that, the smart battery includes:

Multiple batteries;

An equalizing circuit, the equalizing circuit is connected to the battery core, and is used for equalizing the battery core;

A control circuit, the control circuit is connected to the equalization circuit, wherein the control circuit includes a processor and a memory;

The memory is used to store a computer program;

The processor is configured to execute the computer program and, when executing the computer program, implement the following steps:

Obtain the state of charge of multiple cells in the battery;

Determine the equalization trigger condition satisfied by the battery cell according to the state of charge, and determine the equalization activation condition satisfied by the battery cell according to the state of charge, wherein the equalization trigger condition is different from the equalization activation condition; and

The electrical properties are equalized according to the equalization trigger condition, and the battery core is turned on and equalized according to the equalization opening condition.
A charging system, wherein the charging system comprises a charger and the smart battery according to any one of claims 63 to 66, and the charger is used to charge the smart battery.
A computer-readable storage medium, characterized in that, the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the processor realizes the method described in any one of claims 1 to 20. The steps of the equalization method, or the steps of the equalization method according to any one of claims 21 to 41, or the steps of the equalization method according to any one of claims 42 to 61, or the steps of The steps of the equalization method of claim 62.