CN112789780A

CN112789780A - Battery equalization method, intelligent battery, charging system and storage medium

Info

Publication number: CN112789780A
Application number: CN202080005229.8A
Authority: CN
Inventors: 赵云飞; 唐阳洋
Original assignee: SZ DJI Technology Co Ltd
Current assignee: SZ DJI Technology Co Ltd
Priority date: 2020-04-26
Filing date: 2020-04-26
Publication date: 2021-05-11
Also published as: WO2021217314A1

Abstract

An equalization method of a battery, a smart battery, a charging system, and a storage medium, the equalization method comprising: acquiring the charge states of a plurality of battery cells in the battery (S101); determining an equalization triggering condition met by the battery cell according to the state of charge, and performing pressure difference equalization or capacity equalization on the battery cell according to the equalization triggering condition (S102); and determining a balance starting condition met by the battery cell according to the state of charge, and starting differential pressure balance or capacity balance on the battery cell according to the balance starting condition (S103). By combining the pressure difference equalization and the capacity equalization and realizing the decoupling of the equalization opening judgment and the equalization execution, the scenes of equalization opening of the battery can be increased, and the equalization precision and the equalization effect of the battery can be improved.

Description

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

Technical Field

The present disclosure relates to the field of battery technologies, and in particular, to a battery equalization method, an intelligent battery, a charging system, and a storage medium.

Background

In order to meet the requirements of battery capacity and voltage, in practical application, a battery pack is formed by connecting a plurality of battery cells in series and parallel, so that higher output voltage and higher output power are achieved. Ideally, the state of all cells in the battery pack is consistent. However, the small process differences in the manufacturing process can cause the differences in the capacity and internal resistance between the cells, and in the cyclic working process, due to the different working conditions of the cells, such as different operating temperatures, the differences are continuously aggravated in the cyclic charging and discharging process of the cells, thereby causing the imbalance of the battery pack. When the battery pack has an imbalance phenomenon, partial battery cells may be overcharged or overdischarged, and the battery cells may be damaged by overcharging or overdischarging, so that the use and the service life of the battery pack are affected, and even there is a risk of fire or explosion, and therefore, each battery cell in the battery pack needs to be balanced. However, the existing equalization method has the problems of low equalization precision, poor effect and the like.

Disclosure of Invention

Based on the above, the application provides a battery equalization method, an intelligent battery, a charging system and a storage medium, so as to improve the equalization precision and the equalization effect of the battery.

In a first aspect, the present application provides an equalization method for a battery, where the battery includes a plurality of battery cells, the equalization method includes:

acquiring the charge states of a plurality of battery cells in the battery;

determining a balance triggering condition met by the battery cell according to the state of charge, and performing pressure difference balance or capacity balance on the battery cell according to the balance triggering condition; and the number of the first and second groups,

determining a balance starting condition met by the battery cell according to the charge state, and starting differential pressure balance or capacity balance on the battery cell according to the balance starting 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 an equalizing method for a battery, where the battery includes a plurality of battery cells, and the equalizing method includes:

acquiring the charge states of a plurality of battery cells in the battery;

determining an equalization triggering condition met by the battery cell according to the state of charge, wherein the equalization triggering condition comprises an equalization triggering condition of pressure difference equalization and an equalization triggering condition of capacity equalization, and the priority of the pressure difference equalization is higher than that of the capacity equalization;

and according to the balance triggering condition met by the battery cell, performing pressure difference balance or capacity balance on the battery cell.

acquiring the charge states of a plurality of battery cells in the battery;

determining a balance trigger condition met by the battery cell according to the state of charge, wherein the balance trigger condition comprises a balance trigger condition of pressure difference balance and a balance trigger condition of capacity balance;

if the cell meets the balance triggering condition of the pressure difference balance, performing the pressure difference balance on the cell;

and if the battery cell meets the balance triggering condition of the capacity balance, executing the capacity balance on the battery cell.

acquiring the charge states of a plurality of battery cells in the battery;

determining a balance triggering condition met by the battery cell according to the state of charge, and determining a balance starting condition met by the battery cell according to the state of charge, wherein the balance triggering condition is different from the balance starting condition; and

and balancing the electrical property according to the balance triggering condition, and balancing the battery cell according to the balance starting condition.

In a second aspect, the present application further provides a smart battery, comprising:

a plurality of cells;

the equalizing circuit is connected with the battery cell and is used for equalizing the battery cell;

the control circuit is connected with the equalization circuit, and comprises a processor and a memory;

the memory is used for storing a computer program;

the processor is configured to execute the computer program and, when executing the computer program, implement the equalization method according to any of the above.

In a third aspect, the present application further provides a charging system, where the charging system includes a charger and any one of the above smart batteries, and the charger is configured to charge the smart battery.

In a fourth aspect, the present application further provides a computer-readable storage medium, which stores a computer program, and the computer program, when executed by a processor, causes the processor to implement the above-mentioned equalization method.

According to the battery equalization method, the intelligent battery, the charging system and the storage medium, the voltage difference equalization and the capacity equalization are combined, and the equalization opening and the equalization execution decoupling are performed, so that the equalization opening scene of the battery can be increased, and the equalization precision and the equalization effect are improved.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

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

fig. 2 is a schematic circuit diagram of a smart battery provided in an embodiment of the present application;

fig. 3 is a schematic circuit diagram of another smart battery provided in an embodiment of the present application;

fig. 4 is a schematic circuit diagram of another smart battery provided in the embodiment of the present application;

FIG. 5 is a flow chart illustrating steps of an equalization method provided by an embodiment of the present application;

FIG. 6 is a flow chart illustrating steps of another equalization method provided by an embodiment of the present application;

FIG. 7 is a flow chart illustrating steps of another equalization method provided by an embodiment of the present application;

FIG. 8 is a flow chart illustrating steps of yet another equalization method provided by an embodiment of the present application;

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

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The flow diagrams depicted in the figures are merely illustrative and do not necessarily include all of the elements and operations/steps, nor do they necessarily have to be performed in the order depicted. For example, some operations/steps may be decomposed, combined or partially combined, so that the actual execution sequence may be changed according to the actual situation.

At present, in order to increase the capacity of a battery or increase the voltage of the battery, a battery pack is generally formed by connecting a plurality of battery cells in series and parallel to achieve a higher output voltage and a higher output power, so as to meet the requirement of supplying power to electronic equipment.

Ideally, the states of all cells in the battery pack should be consistent. However, the small process differences in the manufacturing process can cause the differences in the capacity and internal resistance between the cells, and in the process of processing cycle operation, due to the different working conditions of the cells, such as different operating temperatures, the differences can be aggravated continuously in the process of cyclic charging and discharging of the cells, thereby causing the imbalance of the battery pack. When the battery pack has an imbalance phenomenon, partial battery cells may be overcharged or overdischarged, and the battery cells may be damaged by overcharging or overdischarging, so that the use safety and the service life of the battery are affected, and even the battery cells are in danger of fire or explosion, and therefore, the battery pack needs to be balanced. However, the existing equalization methods have the problems of low equalization precision, poor effect and the like.

The inventor finds that in the process of charging the intelligent battery through the charger or in the discharging process when the battery supplies power to the electronic equipment, imbalance phenomenon exists in the battery due to difference of single battery cores of the battery, partial battery cores are over-charged or over-discharged possibly due to the imbalance phenomenon, the battery is damaged due to over-charging or over-discharging of the battery core, and therefore the service characteristics and the service life of the battery are affected, and even the danger of fire or explosion exists. When the battery is used on a movable platform, for example, the battery is used in the unmanned aerial vehicle, the single operation time of the unmanned aerial vehicle is limited due to the existence of the unbalanced condition, the flight experience of a user is affected, and even a safety risk may exist.

In a word, when the battery has an unbalanced phenomenon, the whole capacity of the battery can be influenced by a certain battery cell in the battery due to the wooden barrel effect, the service life of the battery can be accelerated and attenuated, and the use cost is increased. Therefore, in the series-parallel connection use of the battery, the cells need to be balanced.

However, most of the current battery equalization schemes are differential pressure equalization, but the differential pressure equalization-based schemes have the following problems: 1) and the balance precision is lower: when the voltage is adopted for balancing, the influence of the capacity difference between the battery cells on the balancing precision can be ignored when the battery is near full charge, the balancing precision is high, but when the SOC interval is lower, the balancing error is larger due to the capacity difference between the battery cells; 2) failure to release the maximum output energy of the battery: the inconsistent capacity of the single battery cells leads to the fact that the voltage of the battery cannot truly reflect the energy state of the battery, and after the pressure difference is balanced, the single battery cells cannot be fully charged at the same time due to the difference of the capacity among the battery cells, so that the battery cannot release the maximum output energy.

Of course, capacity equalization is adopted at present, the equalization effect is ideal and the equalization error is small by adopting a capacity equalization scheme, but the following problems also exist based on the capacity equalization scheme: each cell SOC needs to be accurately estimated, and in practical application, after the battery needs to be kept still for a long time, the SOC of the battery is obtained by using the Open Circuit Voltage (OCV) of the cell, but the balance starting scenes are few, so that the balance effect is poor.

Therefore, the embodiment of the application provides a battery equalization method, an intelligent battery, a charging system and a storage medium.

Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.

Referring to fig. 1, fig. 1 is a schematic block diagram of a charging system according to an embodiment of the present disclosure. 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, such as a movable platform and a load mounted on the movable platform.

Wherein, the movable platform comprises an aircraft, a robot, an electric vehicle or an automatic unmanned vehicle and the like.

For example, the intelligent battery 20 supplies power to a motor of the aircraft to control the motor propeller to rotate, so that the aircraft can fly; for another example, the smart battery 20 supplies power to a camera mounted on an aircraft for realizing aerial photography and the like.

The aircraft includes unmanned aerial vehicle, and this unmanned aerial vehicle includes rotor type unmanned aerial vehicle, for example four rotor type unmanned aerial vehicle, six rotor type unmanned aerial vehicle, eight rotor type unmanned aerial vehicle, also can be fixed wing type unmanned aerial vehicle, can also be the combination of rotor type and fixed wing type unmanned aerial vehicle, does not do the injecing here. The unmanned aerial vehicle can be an agricultural unmanned aerial vehicle, an industrial application unmanned aerial vehicle, a consumer unmanned aerial vehicle and a traversing machine. This unmanned aerial vehicle can have the demand of long single operation time.

The robot comprises an educational robot, a Mecanum wheel omnidirectional chassis is used, a plurality of intelligent armors are arranged on the whole body, and each intelligent armor is internally provided with a hitting detection module which can rapidly detect physical hitting. Simultaneously still include the diaxon cloud platform, can rotate in a flexible way, cooperation transmitter accuracy, stability, launch crystal bullet or infrared light beam in succession, cooperation trajectory light efficiency gives the user more real shooting experience.

Specifically, as shown in fig. 2, the smart battery 20 includes a plurality of battery cells 201, an equalizing circuit 202, and a control circuit 21. A plurality of cells 201 are connected in series, and certainly, are connected in parallel. The equalizing circuit 202 is connected to the battery cell 201 and configured to equalize the battery cell 201, and specifically, the equalizing circuit 202 is further connected to the control circuit 21 and configured to equalize the battery cell 201 under the control of the main control circuit 21.

The control circuit 21 includes a Micro Controller Unit (MCU), and the MCU is configured to execute the equalization method provided in the present application, so as to improve the equalization precision and equalization effect of the battery, and further improve the service life of the battery.

The micro control unit is used for acquiring and processing battery parameters of the battery, wherein the battery parameters comprise charging current, charging voltage, charging time, discharging current, discharging time, constant voltage charging capacity, charging and discharging capacity ratio and the like.

For example, the microcontroller unit may be configured to estimate a state of charge, for example, to determine a state of charge of the battery cell from the open-circuit voltage, to determine a start-up equalization decision and/or to perform equalization on the battery from the state of charge.

In some embodiments, a Battery Management System (BMS) may also be included in the smart Battery 20, and the BMS performs the function of the main control circuit, i.e., the BMS includes a micro control unit.

In some embodiments, the battery management system BMS may include a fuel gauge, which may be used to calculate a State of Charge (SOC) of a cell of the battery, i.e., a remaining battery capacity.

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 for heating the battery core. Specifically, the heating device 22 includes a heating element disposed near the core of the battery for heating the core of the battery. Specifically, the heating device 22 is connected to the control circuit 21, and is capable of heating the battery of the battery under the control of the control circuit 21. In some embodiments, the smart battery 20 may be disposed in a battery compartment of the movable platform, and when the smart battery 20 is mounted in the battery compartment, an in-place detection mechanism is triggered to determine whether the battery is mounted in place.

In some embodiments, as shown in fig. 4, the smart battery 20 is provided with a power management device for communicating with the battery, that is, communicating with the control circuit 21 of the battery, and the power management device is provided with a heating device 22 for heating the battery cell according to the operating state of the battery.

For example, the power management device is configured to communicate with the battery, and when it is determined that the cell of the battery performs 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 is also capable of performing heat dissipation, heat soaking operations on the battery. The heating device can transfer heat, and the heating device is disposed near each battery cell of the smart battery 20, so that the heat of each battery cell can be transferred to the heating device.

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

For example, equalization information corresponding to equalization performed on the battery cell is acquired, and the equalization information is output, and specifically, the equalization information may be displayed on a display. For another example, abnormal information when the battery cell is balanced is monitored and acquired, and a prompt is performed according to the abnormal information, specifically, the abnormal information may be displayed by an indicator light for prompt.

Hereinafter, the method for balancing the battery provided by the present application will be described in detail based on the charging system in fig. 1 and the smart battery in fig. 2. It should be noted that the charging system and the smart battery illustrated in fig. 1 and fig. 2 do not limit the application of the equalization method provided in the present application.

Referring to fig. 5, fig. 5 is a schematic flowchart illustrating steps of a method for balancing a battery according to an embodiment of the present disclosure. The balancing method is applied to the intelligent battery and used for balancing the battery cell of the battery so as to improve balancing precision and balancing effect and further prolong the service life of the battery.

As shown in fig. 5, the equalizing method includes steps S101 to S103.

S101, acquiring the charge states of a plurality of battery cells in the battery;

s102, determining a balance triggering condition met by the battery cell according to the state of charge, and performing pressure difference balance or capacity balance on the battery cell according to the balance triggering condition;

s103, determining a balance starting condition met by the battery cell according to the charge state, and carrying out pressure difference balance or capacity balance on the battery cell according to the balance starting condition.

Specifically, the state of charge may be detected by a fuel gauge in the intelligent battery, or may be calculated by the micro control unit, and the corresponding states of charge of the plurality of battery cells in the battery are obtained, so as to determine whether the battery cell satisfies the equalization trigger condition and/or the equalization start condition according to the states of charge of the battery cells.

In some embodiments, to obtain a more accurate state of charge, the accuracy and effectiveness of cell balancing is improved. Specifically, after the battery is allowed to stand for a first preset time, the state of charge of the battery cells may be determined according to the open-circuit voltages of the battery cells.

After the battery is kept still for the first preset time, the voltage of each battery cell of the battery can be ensured to be stable, and therefore a more accurate charge state can be obtained according to the open-circuit voltage. Due to the fact that batteries made of different materials or different processing technologies have different corresponding first preset durations, the first preset durations can be measured for different batteries in practical application, and the measured first preset durations are stored in the batteries so as to be used when the open-circuit voltage is obtained.

Different battery cores of the same battery are possibly different, so that the corresponding time durations of the different battery cores are different when the voltages of the different battery cores are stable, namely, each battery core of the battery corresponds to a corresponding second preset time duration, and the second preset time durations of the plurality of battery cores are the same or different.

In some embodiments, in order to further obtain more accurate state of charge, the precision and effect of cell balancing are improved. Specifically, after each battery cell in the battery is placed for a second preset time corresponding to the battery cell, the state of charge of the battery cell may be determined according to the open-circuit voltage of the battery cell.

After the states of charge of a plurality of cells in a battery are obtained, a balance triggering condition met by the cells can be determined according to the states of charge, and a balance starting condition met by the cells can be determined according to the states of charge.

The balance triggering conditions are used for triggering the battery to execute balance and comprise balance triggering conditions corresponding to pressure difference balance and balance triggering conditions corresponding to capacity balance; the equalization starting conditions are used for starting the battery cell to judge whether equalization is performed or not, and include equalization starting conditions corresponding to pressure difference equalization and equalization starting conditions corresponding to capacity equalization.

In an embodiment of the present application, the equalization triggering condition corresponding to the pressure difference equalization is different from the equalization opening condition, and/or the equalization triggering condition corresponding to the capacity equalization is different from the equalization opening condition. Therefore, the balanced opening scene can be increased, and the balanced precision and effect are further improved.

For example, the equalization trigger condition for the pressure difference equalization is the same as the equalization opening condition for the pressure difference equalization, but the equalization trigger condition for the capacity equalization is different from the equalization opening condition for the capacity equalization.

For example, the equalization trigger condition for the pressure difference equalization is different from the equalization opening condition for the pressure difference equalization, but the equalization trigger condition for the capacity equalization is the same as the equalization opening condition for the capacity equalization.

For another example, the equalization trigger condition for the pressure difference equalization is different from the equalization opening condition for the pressure difference equalization, and the equalization trigger condition for the capacity equalization is different from the equalization opening condition for the capacity equalization.

Specifically, whether the battery cell meets the balance triggering condition of pressure difference balance and the balance triggering condition of capacity balance is determined according to the state of charge, and whether the battery cell meets the balance opening condition corresponding to the pressure difference balance and the balance opening condition corresponding to the capacity balance is determined according to the state of charge.

For example, it may be specifically determined whether the battery cell meets an equalization triggering condition of pressure difference equalization according to the state of charge; and if the battery cell does not meet the balance triggering condition of the pressure difference balance, determining whether the battery cell meets the balance triggering condition of the capacity balance according to the charge state.

In some embodiments, steps S101 to S103 may not be limited to a specific application scenario. For example, when the battery is mounted in a movable platform, but the battery is not already operating, 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, without being limited to a specific application scenario, it is possible to perform equalization or turn on equalization as long as an equalization trigger condition or an equalization turn-on condition is satisfied.

In some embodiments, it may be determined whether the cell satisfies an equalization-on condition first, that is, before determining the equalization trigger condition that the cell satisfies according to the state of charge, it may also be determined whether the cell satisfies the equalization-on condition according to the state of charge; if the battery cell meets the balance starting condition, determining a balance triggering condition met by the battery cell according to the charge state; and if the battery cell does not meet the balance starting condition, continuously acquiring the charge states of a plurality of battery cells in the battery.

In some embodiments, to further improve the accuracy and effectiveness of the equalization. The capacity balancing trigger condition comprises 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.

Accordingly, when performing capacity balancing on the battery cell according to the balancing trigger condition, specifically, when the battery cell satisfies the first capacity trigger condition, the balancing time of the battery cell may be obtained, and when the battery cell satisfies the second capacity trigger condition, the capacity balancing may be performed on the battery cell according to the balancing time. Through the first capacity trigger condition and the second capacity trigger condition, the equalization time can be determined firstly, and when the execution of equalization needs to be started, the capacity equalization is executed on the battery cell according to the equalization time, so that the accuracy and the efficiency of the capacity equalization are improved.

In some embodiments, equalization efficiency is improved in order to obtain equalization time quickly. The method comprises the steps of obtaining the balance time of the battery cell, specifically obtaining preset balance time, and taking the preset balance time as the balance time. The preset equalization time period is related to the battery, for example, related to the material of the battery, and the preset equalization time periods of batteries with different materials are different.

In other embodiments, equalization time is obtained quickly and accurately to improve equalization accuracy. The method includes the steps of obtaining balance time of the battery cell, specifically obtaining capacity of the battery cell, obtaining balance current corresponding to capacity balance of the battery cell, determining the balance time of the battery cell according to the capacity of the battery cell and the balance current, and dividing the capacity of the battery cell by the corresponding balance current to obtain the balance time.

In some embodiments, whether the cell meets an equalization triggering condition corresponding to the pressure difference equalization may be determined according to the first charge threshold. Specifically, it may be determined whether the state of charge is greater than a first threshold of charge; if the state of charge is larger than a first charge threshold, determining that the battery cell meets the balance triggering condition of the pressure difference balance; and if the state of charge is not greater than a first charge threshold, determining that the battery cell does not meet the balance triggering condition of the pressure difference balance.

For example, the first charge threshold 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 for the pressure difference equalization, and then the pressure difference equalization is performed on the battery cell; and when the SOC of the battery cell is smaller than or equal to the SOC _ highlimit, determining that the battery cell does not meet the balance triggering condition of the pressure difference balance, and not executing the pressure difference balance.

It is understood that the first charge threshold value SOC _ highlimit may also be used to determine whether the cell satisfies an equalization opening condition corresponding to the pressure difference equalization, that is, if the state of charge SOC of the battery is greater than the first charge threshold value SOC _ highlimit, it is determined that the cell satisfies the equalization opening condition of the pressure difference equalization; and if the state of charge (SOC) of the battery cell is not greater than a first SOC _ high limit, determining that the battery cell does not meet the balance opening condition of the pressure difference balance.

In practical applications, the first charge threshold SOC _ highlimit can be used to indicate that the battery is in a state near full charge, and the differential pressure equalization determination and execution can be started through the first charge threshold SOC _ highlimit. Therefore, the equalization can be performed near the full charge point of the battery by adopting pressure difference equalization, and the influence of the capacity difference between the battery cores on the equalization precision can be ignored, so that the equalization precision and the equalization effect are improved.

Preferably, the equalization opening condition of the pressure difference equalization may also be determined by using other charge thresholds, so as to implement decoupling of the opening judgment and execution of the pressure difference equalization, and further increase the scene of the equalization opening of the battery, where the other charge thresholds may specifically be charge thresholds different from the SOC _ highlimit, and a specific value is not limited herein.

In some embodiments, it may be determined whether the battery cell meets an equalization triggering condition corresponding to capacity equalization according to a second charge threshold, and specifically, it may be determined whether the state of charge is greater than the second charge threshold; if the state of charge is larger than a second charge threshold, determining that the battery cell meets the balance triggering condition of the capacity balance; and if the state of charge is not greater than a second charge threshold, determining that the battery cell does not meet the balance triggering condition of the capacity balance.

For example, the second charge threshold is SOC _ lowlimit, and when the state of charge SOC of the battery cell is greater than the SOC _ lowlimit, it is determined that the battery cell satisfies the balance trigger condition of the capacity balance, and the capacity balance is performed on the battery cell; and when the SOC of the battery cell is less than or equal to the SOC _ lowlimit, determining that the battery cell does not meet the balance triggering condition of the capacity balance, and not executing the capacity balance.

In practical application, the second charge threshold SOC _ lowlimit can be set to a lower electric quantity, so that the balancing is not needed when the electric quantity is lower, and meanwhile, the capacity balancing can be ensured in a larger SOC interval, thereby increasing the balancing start scene of the battery and further improving the balancing precision of the battery.

The equalization starting condition corresponding to the capacity equalization may also be determined according to the second charge threshold, but in order to implement the equalization starting judgment and the decoupling of the equalization execution, preferably, other charge thresholds different from the second charge threshold may be used for the determination, thereby increasing the scenarios of equalization starting.

For example, the equalization-on condition of the capacity equalization may be determined according to a third charge threshold, that is, whether the state of charge is greater than the third charge threshold; if the state of charge is larger than the third charge threshold, determining that the battery cell meets the balanced starting condition; and if the state of charge is less than or equal to the third charge threshold, determining that the battery cell does not meet the balance starting condition.

For example, when the third threshold value of charge is represented by SOC _ medium limit, that is, the state of charge of the battery cell is greater than the third threshold value of charge SOC _ medium limit, it is determined that the battery meets the equalization start condition of capacity equalization, and it is determined whether the battery needs equalization start.

Specifically, when the state of charge is greater than the third charge threshold, it may be determined that the battery cell meets an equalization opening condition corresponding to capacity equalization, and capacity equalization may be opened for the battery cell according to the equalization opening condition to obtain equalization time of the battery cell; and when the state of charge is greater than the second state of charge threshold, determining that the battery cell meets a balance trigger condition corresponding to capacity balance, and performing the capacity balance on the battery cell, namely performing the capacity balance on the battery cell according to the balance time, thereby improving the balance efficiency.

For example, in the capacity balancing, the SOC interval corresponding to the balancing start condition is [ SOC _ media limit, 100% ], and the SOC interval corresponding to the balancing trigger spring is [ SOC _ lowlimit, 100% ], so that the start scene can be increased while the balancing precision is ensured. Because the larger the general SOC is, the higher the equalization precision correspondingly, the SOC interval corresponding to the equalization starting condition is set higher, the required equalization time is obtained at the moment, the required equalization time is saved, if the battery is discharged to the SOC1(SOC1> SOC _ lowtime), the equalization triggering condition is met, and the equalization is continued by using the required equalization time saved in advance. Therefore, the decoupling of the starting judgment of the equalization and the execution of the equalization is realized.

In some embodiments, the first charge threshold is greater than the third charge threshold, which is greater than the second charge threshold. The first charge threshold value may correspond to a balance triggering condition and/or a balance starting condition of the pressure difference balance, the second charge threshold value corresponds to a balance starting condition of the capacity balance, and the third charge threshold value corresponds to a balance triggering condition of the capacity balance. Therefore, when the electric quantity is high, the influence of the capacity difference on the equalization precision can be ignored, and simultaneously, the scene of capacity equalization opening can be increased, so that the equalization precision is relatively improved.

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 values or the same, and the first charge threshold, the second charge threshold, and the third charge threshold of different types of batteries may not be the same.

In some embodiments, in order to improve the equalization accuracy and effect, the sizes of the first charge threshold, the second charge threshold, and the third charge threshold may also be adjusted according to the capacity difference of the cells, so that cells with different capacity sizes correspond to different first charge thresholds, second charge thresholds, and third charge thresholds. Thereby increasing the scenario of equalization turn-on and equalization accuracy of the battery.

In some embodiments, in order to further improve the equalization effect, when equalization is performed on the battery cell, capacity equalization and pressure difference equalization may be included, and the battery temperature may also be controlled to be substantially constant. Specifically, when the cell is equalized, a heating device in the battery is controlled to heat the battery, so that the temperature of the battery is substantially constant. The electric quantity management device can be used for communicating with the battery, and after the current temperature of the battery is determined and when the battery core of the battery is determined to perform equalization, the heating device is controlled to heat the battery of the battery, so that the temperature of the battery is basically constant.

In some embodiments, in order to increase the experience of the user, equalization information corresponding to the equalization performed on the battery cell may be further acquired, and the equalization information is output. The equalization information includes an equalization time, an equalization type including a pressure difference equalization and a capacity equalization, and a battery temperature when performing equalization.

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

In some embodiments, in order to enable a user to know whether equalization is abnormal or not and increase user experience, abnormal information when equalization is performed on the battery cell may be monitored and acquired, and prompt is performed according to the abnormal information. The abnormal information includes an equalization failure and an excessive temperature during equalization, for example, the battery temperature during equalization exceeds a preset threshold.

For example, abnormal information when the battery cell is balanced is monitored and acquired, and prompt is performed according to the abnormal information, specifically, the abnormal information may be displayed by an indicator lamp for prompt, or the abnormal information may be displayed by a display, or the abnormal information may be broadcasted by voice.

The battery equalization control method provided by each embodiment realizes the decoupling of equalization opening judgment and equalization execution and the combination of pressure difference equalization and capacity equalization, thereby increasing the equalization opening scenes and improving the equalization precision and the equalization effect compared with the existing equalization strategy.

Referring to fig. 6, fig. 6 is a schematic flowchart illustrating steps of a method for balancing a battery according to an embodiment of the present disclosure. The balancing method is applied to the intelligent battery and used for balancing the battery cell of the battery so as to improve balancing precision and balancing effect and further prolong the service life of the battery.

As shown in fig. 6, the equalizing method includes steps S201 to S203.

S201, acquiring the charge states of a plurality of battery cells in the battery;

s202, determining a balance trigger condition met by the battery cell according to the charge state;

s203, performing pressure difference equalization or capacity equalization on the battery cell according to the equalization triggering condition met by the battery cell.

The balance triggering conditions comprise a pressure difference balance triggering condition and a capacity balance triggering condition, the priority of the pressure difference balance is higher than that of the capacity balance, namely the pressure difference balance triggering condition and the capacity balance triggering condition are met at the same time, and the pressure difference balance is executed preferentially.

Performing pressure difference equalization or capacity equalization on the battery cell according to an equalization triggering condition met by the battery cell, specifically, if the battery cell meets the equalization triggering condition of the capacity equalization and meets the equalization triggering condition of the pressure difference equalization, performing pressure difference equalization on the battery cell; and if the battery cell meets the balance triggering condition of the capacity balance and does not meet the balance triggering condition of the pressure difference balance, executing the capacity balance on the battery cell.

In some embodiments, before the equalization triggering condition that the cell satisfies is determined according to the state of charge, it may be further determined whether the cell satisfies an equalization turn-on condition according to the state of charge; if the battery cell meets the balance starting condition, determining a balance triggering condition met by the battery cell according to the charge state; and if the battery cell does not meet the balance starting condition, continuously acquiring the charge states of a plurality of battery cells in the battery.

It should be noted that the equalization starting condition is different from the equalization triggering condition, the equalization triggering condition is used for triggering the battery to execute equalization, and the equalization starting condition is used for starting the battery cell to determine whether equalization is performed. The balance triggering conditions comprise balance triggering conditions corresponding to pressure difference balance and balance triggering conditions corresponding to capacity balance; the equalization opening condition includes an equalization opening condition corresponding to the pressure difference equalization and an equalization opening condition corresponding to the capacity equalization.

In some embodiments, the capacity balancing trigger condition comprises a first capacity trigger condition and a second capacity trigger condition; correspondingly, if the battery cell meets the balance triggering condition of the capacity balance, performing the capacity balance on the battery cell, and specifically, when the battery cell meets the first capacity triggering condition, obtaining the balance time of the battery cell; and when the battery cell meets the second capacity trigger condition, performing capacity balancing on the battery cell according to the balancing time. The scene of balance opening can be increased, and the precision and the effect of balance can be further improved.

Acquiring the balance time of the battery cell specifically comprises two modes, namely acquiring a preset balance time, and taking the preset balance time as the balance time; and secondly, acquiring the capacity of the battery cell, then acquiring the balance current corresponding to the capacity balance of the battery cell, and then determining the balance time of the battery cell according to the capacity of the battery cell and the balance current, namely dividing the capacity of the battery cell by the balance current to obtain the balance time.

And determining the balance triggering conditions met by the battery cell according to the state of charge, wherein the balance triggering conditions met by the battery cell include balance triggering conditions corresponding to pressure difference balance and capacity balance.

For example, it may 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 meets an equalization triggering condition of the pressure difference equalization.

In practical applications, the first charge threshold SOC _ highlimit can be used to indicate that the battery is in a state near full charge, and the differential pressure equalization determination and execution can be started through the first charge threshold. Therefore, the equalization can be performed near the full charge point of the battery by adopting pressure difference equalization, and the influence of the capacity difference between the battery cores on the equalization precision can be ignored, so that the equalization precision and the equalization effect are improved.

For example, it may be specifically determined whether the state of charge is greater than a second charge threshold; and if the state of charge is larger than a second charge threshold, determining that the battery cell meets the balance triggering condition of the capacity balance.

In some embodiments, it is determined that the cell satisfies the equalization-on condition, and specifically, it may be determined whether the state of charge is greater than a third charge threshold; if the state of charge is larger than the third charge threshold, determining that the battery cell meets the balanced starting condition; and if the state of charge is less than or equal to the third charge threshold, determining that the battery cell does not meet the balance starting condition.

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

In some embodiments, determining, according to the state of charge, a balance trigger condition that the battery cell satisfies, and performing capacity balance on the battery cell according to the balance trigger condition specifically includes: when the state of charge is greater than the third charge threshold, acquiring the equalization time of the battery cell; and when the state of charge is greater than the second charge threshold, performing capacity equalization on the battery cell according to the equalization time. To increase the capacity balancing opening scenario.

Specifically, when the state of charge is greater than the third charge threshold, it may be determined that the battery cell satisfies an equalization start condition corresponding to capacity equalization, and the equalization time of the battery cell may be obtained by determining that the capacity of the battery cell is equalized according to the equalization start condition; and when the state of charge is larger than the second charge threshold, determining that the battery cell meets a balance trigger condition corresponding to capacity balance, and performing the capacity balance on the battery cell, namely performing the capacity balance on the battery cell according to the balance time.

In some embodiments, to improve the equalization accuracy, the charge thresholds may be dynamically adjusted, for example, the magnitudes of the first charge threshold, the second charge threshold, and the third charge threshold may be adjusted according to the capacity difference of the battery cells.

In some embodiments, in order to improve the equalization effect, the battery temperature may also be controlled to be substantially constant when equalization is performed on the battery cells. The method specifically comprises the following steps: and when the cell is equalized, controlling the heating device to heat the battery so as to keep the temperature of the battery substantially constant.

Or the battery is provided with an electric quantity management device, the electric quantity management device is used for communicating with the battery, the electric quantity management device is provided with a heating device, and when the battery core is balanced, the heating device is controlled to heat the battery, so that the temperature of the battery is basically constant.

In some embodiments, to increase the user experience. Equalization information corresponding to the equalization performed on the battery cell may also be acquired, and the equalization information may be output, for example, the equalization information may be displayed. Or, monitoring and acquiring abnormal information when the cell is balanced, and prompting according to the abnormal information, for example, displaying the abnormal information through an indicator light.

The battery equalization control method provided by each embodiment realizes equalization in a combination mode of pressure difference equalization and capacity equalization, and meanwhile, pressure difference equalization is preferentially used, so that equalization precision and equalization effect can be improved compared with the existing equalization strategy.

Referring to fig. 7, fig. 7 is a flowchart illustrating steps of a method for balancing a battery according to an embodiment of the present disclosure. The balancing method is applied to the intelligent battery and used for balancing the battery cell of the battery so as to improve balancing precision and balancing effect and further prolong the service life of the battery.

As shown in fig. 7, the equalizing method includes steps S301 to S304.

S301, acquiring the charge states of a plurality of battery cells in the battery;

s302, determining a balance trigger condition met by the battery cell according to the state of charge, wherein the balance trigger condition comprises a balance trigger condition of pressure difference balance and a balance trigger condition of capacity balance;

s303, if the battery cell meets the balance triggering condition of the pressure difference balance, executing the pressure difference balance on the battery cell;

and S304, if the battery cell meets the balance triggering condition of the capacity balance, executing the capacity balance on the battery cell.

It should be noted that the equalization starting condition is different from the equalization triggering condition, the equalization triggering condition is used for triggering the battery to execute equalization, and the equalization starting condition is used for starting the battery cell to determine whether equalization is performed.

In some embodiments, the capacity balancing trigger condition comprises a first capacity trigger condition and a second capacity trigger condition.

Correspondingly, if the battery cell meets the balance triggering condition of the capacity balance, performing the capacity balance on the battery cell, and specifically, when the battery cell meets the first capacity triggering condition, obtaining the balance time of the battery cell; and when the battery cell meets the second capacity trigger condition, performing capacity balancing on the battery cell according to the balancing time. The scene of balance opening can be increased, and the precision and the effect of balance can be further improved.

The method includes acquiring the balance time of the battery cell, specifically acquiring a preset balance time length, and using the preset balance time length as the balance time. Of course, the capacity of the battery cell may be obtained first, then the balance current corresponding to the capacity balance of the battery cell is obtained, and then the balance time of the battery cell is determined according to the capacity of the battery cell and the balance current, that is, the capacity of the battery cell is divided by the balance current to obtain the balance time.

In some embodiments, in order to increase the equalization effect, the battery temperature may also be controlled to be substantially constant when equalization is performed on the battery cells. The method specifically comprises the following steps: and when the cell is equalized, controlling the heating device to heat the battery so as to keep the temperature of the battery substantially constant.

The battery equalization control method provided by each embodiment realizes equalization in a combination mode of differential pressure equalization and capacity equalization, and can improve equalization precision and equalization effect compared with the existing equalization strategy.

Referring to fig. 8, fig. 8 is a flowchart illustrating steps of a method for balancing a battery according to an embodiment of the present disclosure. The balancing method is applied to the intelligent battery and used for balancing the battery cell of the battery so as to improve balancing precision and balancing effect and further prolong the service life of the battery.

As shown in fig. 8, the equalizing method includes steps S401 to S403.

S401, acquiring the charge states of a plurality of battery cells in the battery;

s402, determining a balance triggering condition met by the battery cell according to the state of charge, and determining a balance starting condition met by the battery cell according to the state of charge, wherein the balance triggering condition is different from the balance starting condition;

and S403, balancing the electrical property according to the balance triggering condition, and balancing the battery cell according to the balance starting condition.

The equalization starting condition is different from the equalization triggering condition, the equalization triggering condition is used for triggering the battery to execute equalization, and the equalization starting condition is used for starting the battery cell to judge whether equalization is performed or not.

Specifically, a balance starting condition met by the battery cell is determined according to the state of charge, and if the balance starting condition met by the battery cell is met, balance is started on the battery cell according to the balance starting condition; and determining a balance trigger condition met by the battery cell according to the state of charge, and if the balance trigger condition met by the battery cell, balancing the electrical property according to the balance trigger condition.

The cell balancing triggering condition is different from the cell balancing starting condition, for example, different charge thresholds are used to determine the cell balancing triggering condition and the cell balancing starting condition that are met by the cell.

It is understood that the equalization trigger condition includes an equalization trigger condition for pressure difference equalization and an equalization trigger condition for capacity equalization, and the equalization open condition includes an equalization open condition for pressure difference equalization and an equalization open condition for capacity equalization.

It should be noted that this embodiment provides an equalization method for a battery, and specifically, the equalization method of each of the above embodiments may be referred to, and will not be described in detail here.

In summary, the equalization method for the battery provided in this embodiment implements decoupling of equalization start judgment and equalization execution, so that equalization application scenarios can be increased, and equalization accuracy and effect can be improved.

Referring to fig. 9, fig. 9 is a schematic block diagram of an intelligent battery according to an embodiment of the present application. The intelligent battery 20 comprises a plurality of battery cells 201, an equalizing circuit 202 and a control circuit 21, wherein the control circuit 21 comprises a processor 211 and a memory 212, and the processor 211 and the memory 212 are connected through a communication bus, such as an I2C bus.

The balancing circuit 202 is connected to the battery cell 201 and configured to balance the battery cell 201; the control circuit 21 is connected to the balancing circuit 202, and is configured to control the balancing circuit 202 to perform balancing on the battery cell 201.

Specifically, the Processor 211 may be a Micro-controller Unit (MCU), a Central Processing Unit (CPU), a Digital Signal Processor (DSP), or the like.

Specifically, the Memory 212 may be a Flash chip, a Read-Only Memory (ROM) magnetic disk, an optical disk, a usb disk, or a removable hard disk.

The processor is configured to run a computer program stored in the memory, and when executing the computer program, implement the method for balancing a battery according to any one of the embodiments of the present application.

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

acquiring the charge states of a plurality of battery cells in the battery; determining a balance triggering condition met by the battery cell according to the state of charge, and performing pressure difference balance or capacity balance on the battery cell according to the balance triggering condition; determining a balance starting condition met by the battery cell according to the charge state, and starting differential pressure balance or capacity balance on the battery cell according to the balance starting 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 some embodiments, before determining the equalization trigger condition satisfied by the cell according to the state of charge, the processor further implements:

determining whether the battery cell meets a balanced opening condition according to the charge state; and if the battery cell meets the balance starting condition, determining a balance triggering condition met by the battery cell according to the charge state.

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

and if the battery cell does not meet the balance starting condition, continuously acquiring the charge states of a plurality of battery cells in the battery.

In some embodiments, the capacity balancing trigger condition comprises 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: when the battery cell meets the first capacity trigger condition, acquiring the balance time of the battery cell; and when the battery cell meets the second capacity trigger condition, performing capacity balancing on the battery cell according to the balancing time.

In some embodiments, the obtaining the equalization time of the cell includes: and acquiring preset equalization time, and taking the preset equalization time as equalization time.

In some embodiments, the obtaining the equalization time of the cell includes:

acquiring the capacity of the battery cell; acquiring balanced current corresponding to capacity balance of the battery cell; and determining the balance time of the battery cell according to the capacity of the battery cell and the balance current.

In some embodiments, the processor further implements:

determining whether the state of charge is greater than a first threshold of charge; and if the state of charge is larger than a first charge threshold value, determining that the battery cell meets the balance triggering condition of the pressure difference balance.

In some embodiments, the processor further implements:

determining whether the state of charge is greater than a second threshold of charge; and if the state of charge is larger than a second charge threshold, determining that the battery cell meets the balance triggering condition of the capacity balance.

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

when the state of charge is greater than the third charge threshold, acquiring the equalization time of the battery cell; and when the state of charge is greater than the second charge threshold, performing capacity equalization on the battery cell according to the equalization time.

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

In some embodiments, the processor further implements:

determining whether the state of charge is greater than a third threshold of charge; if the state of charge is larger than the third charge threshold, determining that the battery cell meets the balanced starting condition; and if the state of charge is less than or equal to the third charge threshold, determining that the battery cell does not meet the balance starting condition.

In some embodiments, the processor further implements:

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

In some embodiments, the obtaining the states of charge of the plurality of cells in the battery includes:

after the battery is kept still for a first preset time, acquiring open-circuit voltages of a plurality of battery cores in the battery; and determining the state of charge of the battery cell according to the open-circuit voltage.

In some embodiments, each cell of the battery corresponds to a second preset time period, and the second preset time periods of the plurality of cells are the same or different;

accordingly, the acquiring the states of charge of a plurality of battery cells in the battery comprises:

after each battery cell in the battery is kept stand for a second preset time corresponding to the battery cell, acquiring the open-circuit voltage of the battery cell; and determining the state of charge of the battery cell according to the open-circuit voltage of the battery cell.

In some embodiments, the determining, according to the state of charge, an equalization triggering condition that the cell satisfies includes:

determining whether the battery cell meets a balance triggering condition of pressure difference balance according to the charge state; and if the battery cell does not meet the balance triggering condition of the pressure difference balance, determining whether the battery cell meets the balance triggering condition of the capacity balance according to the charge state.

In some embodiments, the processor further implements: and controlling the temperature of the battery to be basically constant when the cell is equalized.

In some embodiments, the processor further implements: and when the cell is equalized, controlling the heating device to heat the battery so as to keep the temperature of the battery substantially constant.

In some embodiments, the battery is provided with a power management device for communicating with the battery, the power management device being provided with a heating device;

accordingly, the processor further implements: and when the cell is equalized, controlling the heating device to heat the battery so as to keep the temperature of the battery substantially constant.

In some embodiments, the processor further implements: and acquiring equalization information corresponding to the battery cell execution equalization, and outputting the equalization information.

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

acquiring the charge states of a plurality of battery cells in the battery; determining an equalization triggering condition met by the battery cell according to the state of charge, wherein the equalization triggering condition comprises an equalization triggering condition of pressure difference equalization and an equalization triggering condition of capacity equalization, and the priority of the pressure difference equalization is higher than that of the capacity equalization; and according to the balance triggering condition met by the battery cell, performing pressure difference balance or capacity balance on the battery cell.

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

if the battery cell meets the balance triggering condition of the capacity balance and the balance triggering condition of the pressure difference balance, performing pressure difference balance on the battery cell; and if the battery cell meets the balance triggering condition of the capacity balance and does not meet the balance triggering condition of the pressure difference balance, executing the capacity balance on the battery cell.

In some embodiments, the determining whether the cell satisfies an equalization turn-on condition according to the state of charge further implements:

correspondingly, if the battery cell meets the balance triggering condition of the capacity balance, performing the capacity balance on the battery cell, including:

when the battery cell meets the first capacity trigger condition, acquiring the balance time of the battery cell; and when the battery cell meets the second capacity trigger condition, performing capacity balancing on the battery cell according to the balancing time.

In some embodiments, the obtaining the equalization time of the cell includes: acquiring the capacity of the battery cell; acquiring balanced current corresponding to capacity balance of the battery cell; and determining the balance time of the battery cell according to the capacity of the battery cell and the balance current.

In some embodiments, the processor further implements: determining whether the state of charge is greater than a first threshold of charge; and if the state of charge is larger than a first charge threshold value, determining that the battery cell meets the balance triggering condition of the pressure difference balance.

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

In some embodiments, the processor further implements: determining whether the state of charge is greater than a third threshold of charge; if the state of charge is larger than the third charge threshold, determining that the battery cell meets the balanced starting condition; and if the state of charge is less than or equal to the third charge threshold, determining that the battery cell does not meet the balance starting condition.

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

In some embodiments, the battery is provided with a heating device, and the processor further implements: and when the cell is equalized, controlling the heating device to heat the battery so as to keep the temperature of the battery substantially constant.

In some embodiments, the battery is provided with a power management device for communicating with the battery, the power management device is provided with a heating device, and the processor further implements:

and when the cell is equalized, controlling the heating device to heat the battery so as to keep the temperature of the battery substantially constant.

acquiring the charge states of a plurality of battery cells in the battery; determining a balance trigger condition met by the battery cell according to the state of charge, wherein the balance trigger condition comprises a balance trigger condition of pressure difference balance and a balance trigger condition of capacity balance; if the cell meets the balance triggering condition of the pressure difference balance, performing the pressure difference balance on the cell; and if the battery cell meets the balance triggering condition of the capacity balance, executing the capacity balance on the battery cell.

correspondingly, if the battery cell meets the balance triggering condition of the capacity balance, performing the capacity balance on the battery cell includes:

In some embodiments, the obtaining the equalization time of the cell includes:

acquiring the charge states of a plurality of battery cells in the battery; determining a balance triggering condition met by the battery cell according to the state of charge, and determining a balance starting condition met by the battery cell according to the state of charge, wherein the balance triggering condition is different from the balance starting condition; and balancing the electrical property according to the balance triggering condition, and balancing the battery cell according to the balance starting 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, and the smart battery 20 is used for supplying power to an electronic device.

In the process of charging or discharging the smart battery 20, any one of the equalization methods provided in the embodiments of the present application is executed, and because the equalization method can improve the equalization precision and the equalization effect, the service life of the smart battery 20 can be prolonged, and the use safety of the battery can be improved.

In an embodiment of the present application, a computer-readable storage medium is further provided, where the computer-readable storage medium stores a computer program, where the computer program includes program instructions, and the processor executes the program instructions to implement any of the steps of the equalization method provided in the foregoing embodiments.

The computer readable storage medium may be an internal storage unit of the smart battery according to any of the foregoing embodiments, such as a memory or an internal storage 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 provided on the Smart battery, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like.

While the invention has been described with reference to specific embodiments, the scope of the invention is not limited thereto, and those skilled in the art can easily conceive various equivalent modifications or substitutions within the technical scope of the invention. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. An equalization method for a battery, wherein the battery comprises a plurality of cells, the equalization method comprising:

acquiring the charge states of a plurality of battery cells in the battery;

2. The method of claim 1, wherein before determining the cell satisfies the equalization trigger condition according to the state of charge, the method further comprises:

determining whether the battery cell meets a balanced opening condition according to the charge state;

and if the battery cell meets the balance starting condition, determining a balance triggering condition met by the battery cell according to the charge state.

3. The method of claim 2, wherein after determining whether the cell satisfies an equalization turn-on condition based on the state of charge, the method further comprises:

4. The method of claim 1, wherein the capacity balancing trigger condition comprises a first capacity trigger condition and a second capacity trigger condition;

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

when the battery cell meets the first capacity trigger condition, acquiring the balance time of the battery cell;

and when the battery cell meets the second capacity trigger condition, performing capacity balancing on the battery cell according to the balancing time.

5. The method of claim 4, wherein the obtaining the equalization time of the cell comprises:

and acquiring preset equalization time, and taking the preset equalization time as equalization time.

6. The method of claim 4, wherein the obtaining the equalization time of the cell comprises:

acquiring the capacity of the battery cell;

acquiring balanced current corresponding to capacity balance of the battery cell;

and determining the balance time of the battery cell according to the capacity of the battery cell and the balance current.

7. The method according to claim 1, characterized in that it comprises:

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

and if the state of charge is larger than a first charge threshold value, determining that the battery cell meets the balance triggering condition of the pressure difference balance.

8. The method of claim 7, wherein the method comprises:

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

and if the state of charge is larger than a second charge threshold, determining that the battery cell meets the balance triggering condition of the capacity balance.

9. The method of claim 8, wherein the determining, according to the state of charge, an equalization trigger condition that the cell satisfies and performing capacity equalization on the cell according to the equalization trigger condition comprises:

when the charge state is larger than a third charge threshold value, acquiring the balance time of the battery cell;

and when the state of charge is greater than the second charge threshold, performing capacity equalization on the battery cell according to the equalization time.

10. The method of claim 9, wherein the first threshold of charge is greater than the third threshold of charge, which is greater than the second threshold of charge.

11. The method of claim 1, further comprising:

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

if the state of charge is larger than the third charge threshold, determining that the battery cell meets the balanced starting condition;

and if the state of charge is less than or equal to the third charge threshold, determining that the battery cell does not meet the balance starting condition.

12. The method of claim 10, further comprising:

13. The method of claim 1, wherein the obtaining the states of charge of the plurality of cells in the battery comprises:

after the battery is kept still for a first preset time, acquiring open-circuit voltages of a plurality of battery cores in the battery;

and determining the state of charge of the battery cell according to the open-circuit voltage.

14. The method of claim 1, wherein each cell of the battery corresponds to a second predetermined time period, and the second predetermined time periods of the plurality of cells are the same or different;

the acquiring the charge states of a plurality of battery cells in the battery comprises the following steps:

after each battery cell in the battery is kept stand for a second preset time corresponding to the battery cell, acquiring the open-circuit voltage of the battery cell;

and determining the state of charge of the battery cell according to the open-circuit voltage of the battery cell.

15. The method of claim 1, wherein the determining, from the state of charge, an equalization trigger condition that the cell satisfies comprises:

determining whether the battery cell meets a balance triggering condition of pressure difference balance according to the charge state;

and if the battery cell does not meet the balance triggering condition of the pressure difference balance, determining whether the battery cell meets the balance triggering condition of the capacity balance according to the charge state.

16. The method of claim 1, further comprising:

and controlling the temperature of the battery to be basically constant when the cell is equalized.

17. The method of claim 16, wherein the battery is provided with a heating device, the method comprising:

18. The method of claim 16, wherein the battery is provided with a power management device for communicating with the battery, the power management device being provided with a heating device, the method comprising:

19. The method of claim 1, further comprising:

and acquiring equalization information corresponding to the battery cell execution equalization, and outputting the equalization information.

20. The method of claim 1, further comprising:

and monitoring and acquiring abnormal information when the battery cell is balanced, and prompting according to the abnormal information.

21. An equalization method for a battery, wherein the battery comprises a plurality of cells, the equalization method comprising:

acquiring the charge states of a plurality of battery cells in the battery;

22. The method of claim 21, wherein the performing pressure difference equalization or capacity equalization on the cell according to the equalization trigger condition satisfied by the cell comprises:

if the battery cell meets the balance triggering condition of the capacity balance and the balance triggering condition of the pressure difference balance, performing pressure difference balance on the battery cell;

and if the battery cell meets the balance triggering condition of the capacity balance and does not meet the balance triggering condition of the pressure difference balance, executing the capacity balance on the battery cell.

23. The method of claim 21, wherein prior to determining the cell satisfies the equalization trigger condition based on the state of charge, the method further comprises:

24. The method of claim 23, wherein determining whether the cell satisfies an equalization turn-on condition based on the state of charge further comprises:

25. The method of claim 21, wherein the capacity balancing trigger condition comprises a first capacity trigger condition and a second capacity trigger condition;

if the battery cell meets the balance triggering condition of the capacity balance, executing the capacity balance on the battery cell, including:

26. The method of claim 25, wherein the obtaining the equalization time of the cell comprises:

27. The method of claim 25, wherein the obtaining the equalization time of the cell comprises:

acquiring the capacity of the battery cell;

28. The method of claim 25, wherein the method comprises:

29. The method of claim 28, wherein the method comprises:

30. The method of claim 29, wherein the determining, from the state of charge, an equalization trigger condition that the cell satisfies and performing capacity equalization on the cell according to the equalization trigger condition comprises:

31. The method of claim 30 wherein said first threshold charge is greater than said third threshold charge, said third threshold charge being greater than said second threshold charge.

32. The method according to claim 23 or 24, further comprising:

33. The method of claim 31, further comprising:

34. The method of claim 21, wherein obtaining the states of charge of the plurality of cells in the battery comprises:

35. The method of claim 21, wherein each cell of the battery corresponds to a second predetermined time period, and the second predetermined time periods of the plurality of cells are the same or different;

36. The method of claim 21, wherein the determining, from the state of charge, an equalization trigger condition that the cell satisfies comprises:

37. The method of claim 21, further comprising:

38. The method of claim 37, wherein the battery is provided with a heating device, the method comprising:

39. The method of claim 37, wherein the battery is provided with a power management device for communicating with the battery, the power management device being provided with a heating device, the method comprising:

40. The method of claim 21, further comprising:

41. The method of claim 21, further comprising:

42. An equalization method for a battery, wherein the battery comprises a plurality of cells, the equalization method comprising:

acquiring the charge states of a plurality of battery cells in the battery;

43. The method of claim 42, wherein prior to determining from the state of charge that the cell satisfies the equalization trigger condition, the method further comprises:

44. The method of claim 43, wherein after determining whether the cell satisfies an equalization turn-on condition based on the state of charge, the method further comprises:

45. The method of claim 42, wherein the capacity balancing trigger condition comprises a first capacity trigger condition and a second capacity trigger condition;

46. The method of claim 45, wherein the obtaining the equalization time of the cell comprises:

47. The method of claim 45, wherein the obtaining the equalization time of the cell comprises:

acquiring the capacity of the battery cell;

48. The method of claim 45, wherein the method comprises:

49. The method of claim 48, comprising:

50. The method of claim 49, wherein the determining, from the state of charge, an equalization trigger condition that the cell satisfies and performing capacity equalization on the cell according to the equalization trigger condition comprises:

when the state of charge is greater than the third charge threshold, acquiring the equalization time of the battery cell;

51. The method of claim 50 wherein said first threshold of charge is greater than said third threshold of charge, said third threshold of charge being greater than said second threshold of charge.

52. The method of claim 43 or 44, further comprising:

53. The method of claim 51, further comprising:

54. The method of claim 42, wherein the obtaining the states of charge of the plurality of cells in the battery comprises:

55. The method of claim 42, wherein each cell of the battery corresponds to a second predetermined time period, and the second predetermined time periods of the plurality of cells are the same or different;

56. The method of claim 42, wherein the determining, from the state of charge, an equalization trigger condition that the cell satisfies comprises:

57. The method of claim 42, further comprising:

58. The method of claim 57, wherein the battery is provided with a heating device, the method comprising:

59. The method of claim 57, wherein the battery is provided with a power management device for communicating with the battery, the power management device being provided with a heating device, the method comprising:

60. The method of claim 42, further comprising:

61. The method of claim 42, further comprising:

62. An equalization method for a battery, wherein the battery comprises a plurality of cells, the equalization method comprising:

acquiring the charge states of a plurality of battery cells in the battery;

63. A smart battery, comprising:

a plurality of cells;

the memory is used for storing a computer program;

the processor for executing the computer program and when executing the computer program implementing the equalizing method as claimed in any one of claims 1 to 20.

64. A smart battery, comprising:

a plurality of cells;

the memory is used for storing a computer program;

the processor, configured to execute the computer program and, when executing the computer program, implement the equalization method according to any of claims 21 to 41.

65. A smart battery, comprising:

a plurality of cells;

the memory is used for storing a computer program;

the processor, configured to execute the computer program and, when executing the computer program, implement the equalization method according to any of claims 42 to 61.

66. A smart battery, comprising:

a plurality of cells;

the memory is used for storing a computer program;

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

acquiring the charge states of a plurality of battery cells in the battery;

67. A charging system comprising a charger for charging a smart battery as claimed in any one of claims 63 to 66 and the smart battery.

68. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program which, when executed by a processor, causes the processor to implement the steps of the equalization method according to one of claims 1 to 20, or the steps of the equalization method according to one of claims 21 to 41, or the steps of the equalization method according to one of claims 42 to 61, or the steps of the equalization method according to claim 62.