CN116666788A - Battery pack, management method thereof and battery management system - Google Patents

Battery pack, management method thereof and battery management system Download PDF

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Publication number
CN116666788A
CN116666788A CN202310943595.3A CN202310943595A CN116666788A CN 116666788 A CN116666788 A CN 116666788A CN 202310943595 A CN202310943595 A CN 202310943595A CN 116666788 A CN116666788 A CN 116666788A
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CN
China
Prior art keywords
module
power supply
battery
voltage
battery module
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Granted
Application number
CN202310943595.3A
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Chinese (zh)
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CN116666788B (en
Inventor
施海驹
黄成成
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Suzhou Renogy New Energy Technoogy Co ltd
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Suzhou Renogy New Energy Technoogy Co ltd
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Priority to CN202310943595.3A priority Critical patent/CN116666788B/en
Publication of CN116666788A publication Critical patent/CN116666788A/en
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Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0063Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/42Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/00032Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange
    • H02J7/00034Charger exchanging data with an electronic device, i.e. telephone, whose internal battery is under charge
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0042Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by the mechanical construction
    • H02J7/0045Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by the mechanical construction concerning the insertion or the connection of the batteries
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0068Battery or charger load switching, e.g. concurrent charging and load supply
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007Regulation of charging or discharging current or voltage
    • H02J7/00712Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H02J7/007182Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/42Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H01M2010/4271Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Battery Mounting, Suspending (AREA)

Abstract

The application discloses a battery pack, a management method thereof and a battery management system. The battery pack includes: a battery module; the power supply interface is used for connecting external charging equipment or discharging external loads; the communication interface is used for communicating with external charging equipment; the power supply module is used for supplying power to the control module; the power supply switching module can selectively connect or disconnect the connection between the power supply module and at least one of the battery module, the power supply interface and the communication interface so as to switch the power supply path of the power supply module; the control module is used for obtaining the voltage of the battery module, and controlling the power supply switching module to conduct connection between the power supply module and the power supply interface and/or the communication interface in response to the voltage of the battery module being smaller than or equal to a first preset voltage threshold. The embodiment ensures that when the battery voltage is very low, the power supply module still has a proper power supply path, and ensures the normal operation of the power supply module.

Description

Battery pack, management method thereof and battery management system
Technical Field
The application relates to the technical field of battery power supply, in particular to a battery pack, a management method thereof and a battery management system.
Background
With the development of new energy automobiles, hybrid power tools and energy storage industries, various batteries are widely used. In the process of using the battery, it is particularly important to monitor the charge and discharge process of the battery, and faults such as overcharge, overdischarge, over-temperature, overcurrent and short circuit of the battery are avoided, so that the safety performance of the product is improved, the service life of the battery is prolonged, and therefore, a battery management system (Battery Management Systerm, BMS) is generated under the background.
The good monitoring and protection effect of the BMS on the battery is established on the basis that the BMS can stably and reliably operate, and the power supply of the BMS is directly provided by the battery. When the voltage of the battery is monitored to be very low, the existing BMS, especially the BMS in the lithium battery, can lock the battery directly, and the BMS cannot be continuously supplied with power and cannot work normally, so that the monitoring of the battery cannot be continuously performed, and a charging loop cannot be established to activate the battery by connecting an external charger.
Disclosure of Invention
The application provides a battery pack, a management method thereof and a battery management system thereof, which ensure that a power supply module in the battery pack can still be normally powered by switching a power supply path of the power supply module when the voltage of the battery pack is very low, and the battery pack is not required to be additionally processed.
According to an aspect of the present application, there is provided a battery pack including:
the battery module comprises at least one single battery;
the power supply interface is used for connecting external charging equipment or discharging external loads;
a communication interface for communicating with an external charging device;
the power supply module is used for supplying power to the control module;
a power supply switching module configured to selectively turn on or off a connection between the power supply module and at least one of the battery module, the power supply interface, and the communication interface to switch a power supply path of the power supply module;
the control module is used for obtaining the voltage of the battery module, and responding to the voltage of the battery module being smaller than or equal to a first preset voltage threshold value, the power supply switching module is controlled to conduct connection between the power supply module and the power supply interface and/or the communication interface.
Optionally, the control module is further configured to control the power supply switching module to disconnect the power supply module from the battery module in response to the voltage of the battery module being less than or equal to a first preset voltage threshold.
Optionally, the battery pack further includes:
the first end of the voltage conversion module can be selectively connected with the battery module, and the second end of the voltage conversion module is connected with the power interface;
the control module is further configured to control the first end of the voltage conversion module to be connected with the battery module in response to the voltage of the battery module being less than or equal to a first preset voltage threshold, so that the voltage output by the second end of the voltage conversion module is greater than the voltage of the battery module.
Optionally, the power supply switching module includes a first switch, a common terminal of the first switch is connected with a positive terminal or a negative terminal of the battery module, a first selection terminal of the first switch is connected with the power supply module, and a second selection terminal of the first switch is connected with the voltage conversion module; the first switch is used for responding to the voltage of the battery module to be smaller than or equal to a first preset voltage threshold value and communicating with the voltage conversion module.
Optionally, the battery pack further comprises a charging current limiting module connected in a charging and discharging path of the battery module;
the control module is further configured to determine a power supply path of the power supply module, and control the charging current limiting module to enable the external charging device to charge the battery module through the charging current limiting module in response to the voltage of the battery module being less than or equal to a first preset voltage threshold, and the power supply module being powered by the power supply interface.
Optionally, the battery pack further includes a charge-discharge switch module connected in a charge-discharge path of the battery module, and the charge-discharge switch module is connected in parallel with the charge current limiting module;
the control module is further configured to control the charge-discharge switch module to be enabled and the charge current limiting module to be disabled in response to the voltage of the battery module being greater than the first preset voltage threshold, and/or control the power supply switch module to conduct connection between the power supply module and the battery module and to cut off connection between the power supply module and the power supply interface and/or the communication interface.
Optionally, the battery pack further includes a charge-discharge switch module connected in a charge-discharge path of the battery module, and the charge-discharge switch module is connected in parallel with the charge current limiting module;
the control module is further used for controlling the charge-discharge switch module and the external charging equipment to communicate in response to the voltage of the battery module being smaller than or equal to a first preset voltage threshold, and the power supply module is powered by the communication interface, so that the external charging equipment charges the battery module through the charge-discharge switch module.
Optionally, the control module is further configured to control the battery module to continue discharging until the voltage of the battery module is less than or equal to the first preset voltage threshold in response to obtaining the deep discharging instruction.
According to another aspect of the present application, there is provided a method for managing a battery pack including a battery module including at least one unit cell; the power supply interface is used for connecting external charging equipment or discharging external loads; a communication interface for communicating with an external charging device; the power supply module is used for supplying power to the control module; a power supply switching module configured to selectively turn on or off a connection between the power supply module and at least one of the battery module, the power supply interface, and the communication interface to switch a power supply path of the power supply module; the management method of the battery pack is executed by the control module;
the management method of the battery pack comprises the following steps:
acquiring the voltage of the battery module;
and controlling the power supply switching module to conduct connection between the power supply module and the power supply interface and/or the communication interface in response to the voltage of the battery module being smaller than or equal to a first preset voltage threshold.
According to another aspect of the present application, there is provided a battery management system including a memory storing a computer program and a processor implementing the above-described battery pack management method when the processor invokes the computer program.
The battery pack provided by the embodiment of the application comprises a battery module, a power interface module, a communication interface module, a power supply switching module and a control module. When the voltage of the battery module is smaller than or equal to a first preset voltage threshold, the battery pack is shown to be in a serious under-voltage state, and at the moment, the control module automatically controls the power supply switching module to switch the charging path of the power supply module into the power supply interface and/or the communication interface, so that when the battery pack is connected with external charging equipment, the external charging equipment can supply power to the power supply module, the control module is ensured to still have an appropriate power supply path when the voltage of the battery is very low, and the battery pack can still be charged and activated through the external charging equipment under the serious under-voltage state.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the application or to delineate the scope of the application. Other features of the present application will become apparent from the description that follows.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural view of a battery pack according to an embodiment of the present application;
fig. 2 is a schematic structural view of another battery pack according to an embodiment of the present application;
fig. 3 is a schematic diagram of a hardware control structure of a first switch according to an embodiment of the present application;
fig. 4 is a flowchart of a method for managing a battery pack according to an embodiment of the present application;
fig. 5 is a flowchart of another method for managing a battery pack according to an embodiment of the present application;
fig. 6 is a flowchart of another method for managing a battery pack according to an embodiment of the present application.
Detailed Description
Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the application. Rather, they are merely examples of apparatus and methods consistent with aspects of the application as detailed in the accompanying claims.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. It will be further understood that, as used herein, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context indicates otherwise. Furthermore, the terms "or," "and/or," "including at least one of," and the like, as used herein, are to be construed as inclusive, or mean any one or any combination. An exception to this definition will occur only when a combination of elements, functions, steps or operations are in some way inherently mutually exclusive.
It should be understood that although the terms first, second, third, etc. may be used herein to describe various parameters or modules, these parameters or modules should not be limited by these terms. These terms are only used to distinguish one parameter or module from another of the same type. For example, a first parameter may also be referred to as a second parameter, and similarly, a second parameter may also be referred to as a first parameter, without departing from the scope herein. The words "if", as used herein, may be interpreted as "at … …" or "at … …" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrase "if determined" or "if detected (stated condition or event)" may be interpreted as "when determined" or "in response to determination" or "when detected (stated condition or event)" or "in response to detection (stated condition or event), depending on the context. Furthermore, components, features, elements of the application that are commonly referred to in different embodiments may have the same meaning or may have different meanings, the particular meaning of which is to be determined by its interpretation in this particular embodiment or further by reference to the context of this particular embodiment.
It should be understood that, although the steps in the flowcharts in the embodiments of the present application are shown in order as indicated by the arrows, these steps are not necessarily performed in order as indicated by the arrows. The steps are not strictly limited in order and may be performed in other orders, unless explicitly stated herein. Moreover, at least some of the steps in the figures may include multiple sub-steps or stages that are not necessarily performed at the same time, but may be performed at different times, the order of their execution not necessarily occurring in sequence, but may be performed alternately or alternately with other steps or at least a portion of the other steps or stages.
It should be understood that the detailed description and specific examples are intended for purposes of illustration only and are not intended to limit the scope of the claims.
Fig. 1 is a schematic structural diagram of a battery pack according to an embodiment of the present application, and referring to fig. 1, the battery pack includes:
the battery module 1, the battery module 1 includes at least a single battery;
a power interface 2, the power interface 2 being used for connecting an external charging device or discharging an external load;
A communication interface 3, the communication interface 3 being for communication with an external charging device;
the power supply module 4 is used for supplying power to the control module;
a power supply switching module 5, the power supply switching module 5 being configured to selectively turn on or off connection between the power supply module 4 and at least one of the battery module 1, the power supply interface 2, and the communication interface 3 to switch a power supply path of the power supply module 4;
the control module is used for acquiring the voltage of the battery module 1, and controlling the power supply switching module 5 to conduct connection between the power supply module 4 and the power supply interface 2 and/or the communication interface 3 in response to the voltage of the battery module 1 being smaller than or equal to a first preset voltage threshold.
Specifically, at least one unit cell included in the battery module 1 may be a lithium battery or a sodium battery, and when the battery module 1 is formed by using a plurality of unit cells, the plurality of unit cells are connected in series and parallel to each other to form the battery module 1 having a specific voltage level and capacity. Preferably, the battery module 1 includes at least one sodium battery that can maintain charge and discharge capability without being damaged even when the voltage is extremely low. However, most of the battery management systems currently on the market are designed for the characteristics of lithium batteries, and once the battery module 1 or the unit battery is detected to be in a low-voltage state, the battery is locked, and even if the battery module is charged by an external charging device, a charging loop cannot be established to activate the battery. It is therefore necessary to provide a solution that enables the function of the external charger to charge and activate the battery pack when the battery module 1 is in a low-voltage locked state.
The power interface 2 is used for connecting the battery pack with external charging equipment, the external charging equipment connected with the power interface 2 can supply power to the battery module 1 and the power module 4, or the power interface 2 is also used for connecting the battery pack with an external load, and the battery module 1 discharges to the external load through the power interface 2. The power interface 2 may include a power positive interface and a power negative interface.
The battery pack also comprises a communication interface 3, and the external charging devices with the communication function are connected with each other through the communication interface 3, so that the communication function between the battery pack and the external charging devices is realized. At the same time, the external charging device can supply power to the power module 4 of the battery pack through the communication interface 3.
The battery pack also comprises a power supply module 4, and the power supply module 4 provides required power for the control module of the battery pack so that the control module can monitor each functional module of the battery pack. In particular, the control module refers to a battery management system BMS of the battery pack or an MCU chip dedicated to battery pack control.
The first end of the power supply switching module 5 is respectively connected with the battery module 1, the power interface 2 and the communication interface 3, and the second end of the power supply switching module 5 is connected with the power module 4. The power supply switching module 5 may selectively turn on or off connection between the power supply module 4 and at least one of the battery module 1, the power supply interface 2, and the communication interface 3 according to a control instruction of the control module to switch a power supply path of the power supply module 4.
The control module comprises at least a sampling unit and a control unit, wherein the sampling unit can be composed of elements such as an AFE chip and is used for acquiring and processing parameters of the battery module and/or the single battery. Illustratively, the power supply switching module 5 responds to a control instruction output by the control module when the voltage of the battery module 1 is less than or equal to a first preset voltage threshold, and conducts the connection between the power module 4 and the power interface 2 and/or the communication interface 3, so that when the voltage of the battery module 1 is low, the external charging device can supply power to the power module 4 through the power interface 2 and/or the communication interface 3, so as to ensure that the control module can normally manage the battery pack. The first preset voltage threshold is a critical value representing that the battery module 1 is in a serious under-voltage state, and a user can set according to the characteristic requirements of the single batteries adopted in the battery module 1.
In this embodiment, when the voltage of the battery module is less than or equal to the first preset voltage threshold, it indicates that the battery pack is in a serious under-voltage state, and at this time, the control module automatically controls the power supply switching module to switch the charging path of the power module to the power interface and/or the communication interface, so when the battery pack is connected with the external charging device, the external charging device can supply power to the power module, and it is ensured that the control module still has an appropriate power supply path when the battery voltage is very low, so that the battery pack can still be activated by charging through the external charging device under the serious under-voltage state.
Optionally, the control module is further configured to control the power supply switching module 5 to disconnect the power supply module 4 from the battery module 1 in response to the voltage of the battery module 1 being less than or equal to a first preset voltage threshold. That is, when the battery module 1 enters the severe under-voltage state, in order to avoid that the battery module 1 continues to supply power to the power module 4 and the voltage of the battery module 1 is further reduced, the control module outputs a control signal to the power supply switching module 5, so that the power supply switching module 5 disconnects the power module 4 from the battery module 1.
Optionally, the power supply switching module 5 includes a second switch S2 and a third switch S3, where the second switch S2 is connected to a connection path between the power interface 2 and the power module 4, and the third switch S3 is connected to a connection path between the communication interface 3 and the power module 4. The power supply switching module 5 further includes a first switch S1, and the first switch S1 is connected to a connection path between the battery module 1 and the power supply module 4. When the power supply switching module 5 switches the power supply path of the power supply module 4, the control module can control the conduction states of the first switch S1, the second switch S2 and the third switch S3. The control module controls the power supply switching module 5 to only conduct the connection between the power supply module 4 and the power supply interface 2 or only conduct the connection between the power supply module 4 and the communication interface 3 or simultaneously conduct the connection between the power supply module 4 and the power supply interface 2 and the connection between the power supply module 4 and the communication interface 3 by controlling the on-off state of each switch included in the power supply switching module 5, so that the power supply of the power supply module 4 is switched from the power supply module 1 to the power supply of the external charging equipment through the power supply interface 2 and/or the communication interface 3 when the battery module 1 enters a severe under-voltage state, further, the voltage of the battery module 1 can be prevented from being further reduced, and meanwhile, the battery management system can still charge and activate through the external charging equipment after locking a battery pack, thereby improving the use experience of a user.
Fig. 2 is a schematic structural diagram of another battery pack according to an embodiment of the present application, and referring to fig. 2, optionally, the battery pack further includes:
the first end of the voltage conversion module 6 can be selectively connected with the battery module 1, and the second end of the voltage conversion module 6 is connected with the power interface;
the control module is further configured to control the first end of the voltage conversion module 6 to be connected to the battery module 1 so that the voltage output by the second end of the voltage conversion module 6 is greater than the voltage of the battery module 1 in response to the voltage of the battery module 1 being less than or equal to the first preset voltage threshold.
In the present embodiment, when the battery pack is connected to an external charging device, the type and function of the charging device may vary widely. In particular, there is a battery charging device with a charging protection function, and when a user connects the battery charging device with a battery pack, the battery charging device detects a voltage at a power interface of the battery pack, and outputs a charging current to the battery pack only when the voltage exceeds a certain threshold value, thereby preventing the user from reversely connecting positive and negative terminals or enabling the battery charging device to adaptively output charging power with a proper size. However, when the battery module 1 enters a severe under-voltage state, the voltage at the power interface 2 detected by the external charging device is equal to the voltage of the battery module 1, which may be significantly lower than the voltage threshold at which the charging device starts charging, so even though the foregoing embodiment solves the problem of the power supply path of the control module in the battery pack, effective charging is still not performed when the battery pack encounters such a charging device.
Therefore, the battery pack in the present embodiment further includes a voltage conversion module 6, and specifically, the voltage conversion module 6 may be a DC-DC conversion circuit; preferably, the voltage conversion module 6 may be a Boost circuit. A first end of the voltage conversion module 6 is selectively connectable with the battery module 1, preferably, the first end of the voltage conversion module 6 is connected with the battery module 1 in response to the voltage of the battery module 1 being less than or equal to a first preset voltage threshold; alternatively, the first end of the voltage conversion module 6 is disconnected from the battery module 1 in response to the voltage of the battery module 1 being greater than a first preset voltage threshold. When the power interface 2 is connected to an external charging device, and the external charging device connected by the power interface 2 is used to charge the battery module 1 with a severe under-voltage, for example, if the connected external charging device is a lithium battery charger without an activation function, the external charging device will charge the battery module 1 only when the voltage at the power interface 2 is greater than a second preset voltage threshold. And in the case of a severe under-voltage of the battery module 1, the voltage of the battery module 1 is insufficient for the external charging device to output the voltage. Therefore, when it is detected that the voltage of the battery module 1 is less than or equal to the first preset voltage threshold, the control module controls the first end of the voltage conversion module 6 to be connected with the battery module 1. The voltage conversion module 6 outputs the boosted voltage of the battery module 1, and the voltage output by the voltage conversion module 6 is greater than a second preset voltage threshold value, so that the external charging equipment can charge the battery module 1 normally after detecting the boosted voltage value at the power interface.
In this embodiment, the voltage of the battery module 1 is boosted by setting the voltage conversion module 6, so that when the external charging device connected with the battery pack does not have an activation function, even if the battery module 1 enters a severe under-voltage state, that is, when the voltage of the battery module 1 is less than or equal to the first preset voltage threshold, the external charging device can still normally output the voltage to charge the battery module 1, thereby improving the compatibility of the battery pack with the external charging device.
With continued reference to fig. 2, the power switching module optionally includes a first switch S1, which may be a single pole double throw switch. The public end of the first switch S1 is connected with the negative electrode end B-of the battery module 1, the first selection end of the first switch S1 is connected with the power module 4, and the second selection end of the first switch S1 is connected with the voltage conversion module 6; the first switch S1 is controlled to communicate with the voltage conversion module 6 in response to the voltage of the battery module 1 being less than or equal to a first preset voltage threshold. It should be noted that fig. 2 only shows an example in which the common terminal of the first switch S1 is connected to the negative terminal B of the battery module 1, but the present embodiment is not limited thereto, and those skilled in the art should understand that the connection of the common terminal of the first switch S1 to the positive terminal b+ of the battery module 1 can also achieve the technical purpose of selectively connecting the first terminal of the voltage conversion module to the battery module and the control effect thereof, which are not described herein again, and are all included in the protection scope of the present application.
Taking the embodiment shown in fig. 1 and 2 as an example, the power interface 2 includes a positive terminal p+ and a negative terminal P-, and the voltage conversion module 6 is connected to the positive terminal p+ and the negative terminal P-of the power interface 2, respectively. The power supply switching module includes a first switch S1, a second switch S2, and a third switch S3, and the power supply module 4 is connected to the negative terminal B-of the battery module 1 through the first switch S1, to the positive terminal p+ of the power supply interface 2 through the second switch S2, and to the communication interface 3 through the third switch S3. The voltage conversion module 6 is selectively connectable to the negative terminal B-of the battery module via a first switch S1. It should be noted that the power module 4 and the voltage conversion module 6 are also connected to the positive terminal b+ of the battery module, respectively.
The on or off of the first switch S1 may be controlled by a control module, specifically, the first switch S1 is connected to the control module, and the control module is configured to obtain the voltage of the battery module 1, and when the voltage of the battery module 1 is less than or equal to a first preset voltage threshold, control the common terminal of the first switch S1 to be connected to the second selection terminal, so as to connect the battery module 1 to the voltage conversion module 6, and simultaneously disconnect the connection between the battery module 1 and the power module 4.
Alternatively, the turning on or off of the first switch S1 may be controlled by a dedicated hardware circuit. Specifically, fig. 3 is a schematic diagram of a hardware control structure of a first switch according to an embodiment of the present application, referring to fig. 3, the battery module further includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a comparator U1, and a control switch Q1, where a first end of the first resistor R1 is connected to an anode end b+ of the battery module, a first end of the second resistor R2 is connected to a second end of the first resistor R1, and a second end of the second resistor R2 is connected to a cathode end B-of the battery module. The first end of the third resistor R3 is connected with the positive electrode end B+ of the battery module, and the second end of the third resistor R3 is connected with the negative electrode end P-of the battery module. The first power end of the comparator U1 is connected with the positive electrode end B+ of the battery module, the second power end of the comparator U1 is connected with the negative electrode end B-of the battery module, the first input end of the comparator U1 is connected with the second end of the third resistor, the second output end of the comparator U1 is connected with the second end of the first resistor R1, the output end of the comparator U1 is connected with the first end of the fourth resistor R4, the second end of the fourth resistor R4 is connected with the positive electrode end B+ of the battery module, and the output end of the comparator U1 is also connected with the control end of the control switch Q1 through the fifth resistor R5. The control terminal of the first switch S1, the sixth resistor R6 and the control switch Q1 are sequentially connected in series between the positive terminal b+ and the negative terminal B-of the battery module. When the voltage of the battery module is greater than a first preset voltage threshold, the comparator U1 outputs a high level to further close the control switch Q1, and after the control switch Q1 is closed, the public end of the first switch S1 is controlled to be communicated with the first selection end. When the battery voltage is smaller than or equal to a first preset voltage threshold, the comparator U1 outputs a low level to turn off the control switch Q1, and after the control switch Q1 is turned off, the public end of the first switch S1 is controlled to be communicated with the second selection end. In this embodiment, the control condition of the first switch S1 is not specifically limited, and the user may set the first switch S1 to be controlled by the hardware circuit shown in fig. 3 or the control module according to the requirement.
With continued reference to fig. 2, the battery pack optionally further includes a charge current limiting module 7 connected in the charge-discharge path of the battery module 1;
the control module is further configured to determine a power supply path of the power module 4, and control the charging current limiting module 7 to enable the external charging device to charge the battery module 1 through the charging current limiting module 7 in response to the voltage of the battery module 1 being less than or equal to the first preset voltage threshold, and the power module 4 being powered by the power interface 2.
Specifically, when the external charging device charges the battery module 1, the external charging device charges the battery module 1 through the power interface 2. Optionally, the positive terminal p+ of the power interface 2 is also directly connected to the positive terminal b+ of the battery module 1 or connected through a fifth switch S5. In this embodiment, the charging current limiting module 7 is disposed between the negative terminal B-of the battery module 1 and the negative terminal P-of the power interface 2, and in other embodiments, the charging current limiting module 7 may be disposed between the positive terminal b+ of the battery module 1 and the positive terminal p+ of the power interface 2. Optionally, the charging current limiting module 7 includes a fourth switch S4 and a seventh resistor R7, where a control end of the fourth switch S4 is connected to the control module, and the fourth switch S4 and the seventh resistor R7 are connected in series between the negative terminal B-of the battery module 1 and the negative terminal P-of the power interface 2.
When the external charging device and the battery pack establish a charging path, if the selected charging device has no communication function or cannot establish communication connection with the battery pack, the output power of the charging device may not be matched with the current state of the battery pack in a targeted manner, especially when the battery pack is in a severe under-voltage state, if the charging device still charges according to the rated power, the generated high current may damage various elements in the battery pack. Therefore, when the control module determines that the voltage of the battery module 1 is less than or equal to the first preset voltage threshold and the power module 4 is currently powered by the power interface 2, it indicates that the battery pack is in a serious under-voltage state, and no communication connection is established between the external charging device and the battery pack, so that the control module controls the fourth switch S4 to be closed, thereby providing a mechanism capable of controlling the magnitude of the charging current, so that the external charging device charges the battery module 1 with a small current through the seventh resistor R7, and the battery can be effectively prevented from being damaged by a large current.
With continued reference to fig. 2, optionally, the battery pack further includes a charge-discharge switch module 8 connected in a charge-discharge path of the battery module, the charge-discharge switch module 8 being connected in parallel with the charge current limiting module 7;
The control module is further configured to control the charge-discharge enabling switching module 8 and the charge-current limiting module 7 to be disabled and/or control the power supply switching module to switch on the connection between the power module 4 and the battery module 1 and to switch off the connection between the power module 4 and the power interface 2 and/or the communication interface 3 in response to the voltage of the battery module 1 being greater than a first preset voltage threshold.
Illustratively, the charge-discharge switch module 8 includes a discharge switch Q2 and a charge switch Q3, with the discharge switch Q2 and the charge switch Q3 being connected in series between the negative terminal B-of the battery module 1 and the negative terminal P-of the power interface 2. The control end of the discharging switch Q2 and the control end of the charging switch Q3 are connected with a control module. When the control module detects that the voltage of the battery module 1 is smaller than or equal to a first preset voltage threshold and the power supply module 4 is powered by the power supply interface 2, the control module controls the external charging equipment to charge the battery module 1 with a first current through the charging current limiting module 7 until the battery module 1 is separated from a serious under-voltage state. After the external charging device properly charges the battery module 1 with the first current, when the control module detects that the voltage of the battery module 1 is greater than a first preset voltage threshold, the control module controls the fourth switch S4 to be opened, controls the discharging switch Q2 and the charging switch Q3 to be closed, enables the charging and discharging switch module 8, controls the external charging device to charge the battery module 1 with the second current through the charging and discharging switch module 8, and accelerates the charging speed of the battery module 1, wherein the second current can be the rated current of the external charging device, and the second current is greater than the first current. Therefore, after the battery pack is separated from a severe under-voltage state, the automatic control is switched into a conventional charging path, so that the charging equipment can charge with higher efficiency, and the waste of electric energy is avoided.
Further, after detecting that the voltage of the battery module 1 is greater than the first preset voltage threshold, the control module controls the second switch S2 and the third switch S3 to be turned off so as to cut off the connection between the power module 4 and the communication interface 3 and the connection between the power module and the power interface 2, and controls the common terminal of the first switch S1 to be connected with the first selection terminal so as to switch the power module 4 to be powered by the battery module 1. Optionally, the battery pack further includes a single detection module, and when the voltage of the battery module 1 is greater than a first preset voltage threshold, the control module enables the single detection module, and the single detection module is configured to obtain the voltage of each single battery in the battery module 1 and monitor each single battery.
Alternatively, the control module is further configured to control the charge-discharge switch module 8 to be enabled and communicate with an external charging device to enable the external charging device to charge the battery module 1 through the charge-discharge switch module 8 in response to the voltage of the battery module 1 being less than or equal to the first preset voltage threshold, and the power module 4 being powered by the communication interface 3.
When the voltage of the battery module 1 is less than or equal to the first preset voltage threshold, the power supply switching module controls the power interface 2 and the communication interface 3 to be communicated with the power module 4, if the external charging device has no communication function, the external charging device only supplies power to the power module 4 through the power interface 2, that is, when the voltage of the battery module 1 is less than or equal to the first preset voltage threshold, the external charging device is controlled to charge the battery module 1 with a first current through the charging current limiting module 7 as described in the embodiment above. The first current is a smaller current value. In this embodiment, when the external charging device has the communication function, the communication interface 3 and the power interface 2 are both connected with the external charging device, and the communication interface 3 is preferentially used to supply power to the power module 4, so as to close the connection between the power interface 2 and the power module 4. After detecting that the external charging equipment supplies power to the power supply module 4 through the communication interface 3, the control module controls the charge-discharge switch module 8 to be conducted and communicates with the external charging equipment, so that the external charging equipment charges the battery module 1 through the charge-discharge switch module 8 with a first current. When the external charging device has a communication function, the control module may communicate with the external charging device and control the external charging device to output a first current to charge the battery module 1 when the voltage of the battery module 1 is less than or equal to a first preset voltage threshold. In the present embodiment, the type and function of the external charging device that may be connected to the battery pack are fully considered, and when the external charging device is able to establish a communication connection with the battery pack, since both can determine appropriate charging power through the communication connection, charging through the charging current limiting module 7 is not required, but charging is directly performed through the charging/discharging switch module 8, thereby achieving higher charging efficiency and a charging scheme with higher compatibility.
With continued reference to fig. 2, optionally, the control module is further configured to control, in response to obtaining the deep discharge command, the battery module to continue discharging until the voltage of the battery module is less than or equal to a first preset voltage threshold.
In some specific situations, it is more advantageous to have a lower voltage of the battery module, such as during transportation of the battery pack, the battery module in the battery pack is safer to transport when the voltage is lower, or the battery module is safer to store for a long time when the voltage is lower, so that in some special situations, a deep discharge command needs to be generated to discharge the battery module below the undervoltage threshold. Therefore, after receiving the deep discharging instruction, the control module turns off the under-voltage protection function of the battery pack, keeps the charge-discharge switch module 8 of the battery pack in a conducting state, continuously discharges the battery module until the voltage of the battery module is smaller than or equal to the first preset voltage threshold value, and the discharging path can discharge through the charge-discharge switch module and the power interface. Optionally, the battery packs all have an under-voltage protection function, that is, once the voltage of the battery module is smaller than the third preset voltage threshold, the control module can control the battery module to stop discharging outwards, so when the control module receives the deep discharging instruction, the control module firstly turns off the low-voltage protection function of the battery packs and then controls the battery module to discharge outwards. Wherein the third preset voltage threshold is greater than the first preset voltage threshold.
The application also provides a method for managing a battery pack, and fig. 4 is a flowchart of a method for managing a battery pack according to an embodiment of the application, where the battery pack includes: the battery module comprises at least one single battery; the power supply interface is used for connecting external charging equipment or discharging external loads; the communication interface is used for communicating with external charging equipment; the power supply module is used for supplying power to the control module; the power supply switching module can selectively connect or disconnect the connection between the power supply module and at least one of the battery module, the power supply interface and the communication interface so as to switch the power supply path of the power supply module; the management method of the battery pack is performed by the control module. Referring to fig. 4, the management method of the battery pack includes:
s110: the voltage of the battery module is obtained.
S120: and controlling the power supply switching module to conduct connection between the power supply module and the power supply interface and/or the communication interface in response to the voltage of the battery module being smaller than or equal to a first preset voltage threshold.
The battery pack management method in this embodiment has the same advantages as those of the battery pack, and will not be described here again.
Optionally, after S110, the method further includes:
and controlling the power supply switching module to disconnect the power supply module from the battery module in response to the voltage of the battery module being less than or equal to a first preset voltage threshold. This step may be performed between S110 and S120, or may be performed after S120, and is not specifically limited herein.
Optionally, the battery pack further includes: the first end of the voltage conversion module can be selectively connected with the battery module, and the second end of the voltage conversion module is connected with the power interface. After S110, further including:
and controlling the first end of the voltage conversion module to be connected with the battery module in response to the voltage of the battery module being smaller than or equal to a first preset voltage threshold value, so that the voltage output by the second end of the voltage conversion module is larger than the voltage of the battery module. This step may be performed between S110 and S120, or may be performed after S120, and is not specifically limited herein.
Specifically, the power supply switching module comprises a first switch, a public end of the first switch is connected with the positive electrode end or the negative electrode end of the battery module, a first selection end of the first switch is connected with the power supply module, and a second selection end of the first switch is connected with the voltage conversion module. The first switch is used for responding to the fact that the voltage of the battery module is smaller than or equal to a first preset voltage threshold value, and is communicated with the voltage conversion module so that the voltage conversion module is connected with the battery module.
Optionally, the battery pack further includes a charge current limiting module connected in a charge-discharge path of the battery module, and a charge-discharge switch module connected in the charge-discharge path of the battery module, and the charge-discharge switch module is connected in parallel with the charge current limiting module. After S120, it includes:
and determining a power supply path of the power supply module, and controlling the charging current limiting module to enable the external charging equipment to charge the battery module through the charging current limiting module in response to the voltage of the battery module being smaller than or equal to a first preset voltage threshold value and the power supply module being powered by the power interface.
And controlling to enable the charge-discharge switch module and disable the charge current limiting module and/or controlling the power supply switching module to conduct connection between the power supply module and the battery module and to cut off connection between the power supply module and the power supply interface and/or the communication interface in response to the voltage of the battery module being greater than a first preset voltage threshold.
Alternatively, the battery pack further includes a charge current limiting module connected in the charge-discharge path of the battery module, and a charge-discharge switch module connected in the charge-discharge path of the battery module, the charge-discharge switch module being connected in parallel with the charge current limiting module. After S120, it includes:
And in response to the voltage of the battery module being less than or equal to a first preset voltage threshold, the power supply module is powered by the communication interface, and the charging and discharging switch module is controlled to be enabled and communicated with the external charging equipment so that the external charging equipment charges the battery module through the charging and discharging switch module.
When the voltage of the battery module is smaller than or equal to a first preset voltage threshold, the power supply module is powered by the power interface or the corresponding management method of the power supply of the communication interface is different. In this embodiment, the management method shown in fig. 5 aims at supplying power to the power module through the power interface; the management method shown in fig. 6 is to supply power to the power module through the communication interface.
Fig. 5 is a flowchart of another method for managing a battery pack according to an embodiment of the present application, and referring to fig. 5, optionally, the method includes:
s111: the voltage of the battery module is obtained.
S121: and controlling the power supply switching module to conduct connection between the power supply module and the power supply interface and/or the communication interface in response to the voltage of the battery module being smaller than or equal to a first preset voltage threshold.
S131: and controlling the power supply switching module to disconnect the power supply module from the battery module in response to the voltage of the battery module being less than or equal to a first preset voltage threshold.
S141: and controlling the first end of the voltage conversion module to be connected with the battery module in response to the voltage of the battery module being smaller than or equal to a first preset voltage threshold value, so that the voltage output by the second end of the voltage conversion module is larger than the voltage of the battery module.
S151: and determining a power supply path of the power supply module, and controlling the charging current limiting module to enable the external charging equipment to charge the battery module through the charging current limiting module in response to the voltage of the battery module being smaller than or equal to a first preset voltage threshold value and the power supply module being powered by the power interface.
S161: and controlling to enable the charge-discharge switch module and disable the charge current limiting module and/or controlling the power supply switching module to conduct connection between the power supply module and the battery module and to cut off connection between the power supply module and the power supply interface and/or the communication interface in response to the voltage of the battery module being greater than a first preset voltage threshold.
It should be noted that, as will be understood by those skilled in the art, steps S121, S131, S141 and S151 may be performed simultaneously or sequentially, and the embodiment is not limited to the execution sequence of these steps, which can achieve the technical purpose of the embodiment, and are not described herein in detail, and should be included in the protection scope of the present application.
Fig. 6 is a flowchart of another method for managing a battery pack according to an embodiment of the present application, and referring to fig. 6, optionally, the method includes:
s112: the voltage of the battery module is obtained.
S122: and controlling the power supply switching module to conduct connection between the power supply module and the power supply interface and/or the communication interface in response to the voltage of the battery module being smaller than or equal to a first preset voltage threshold.
S132: and controlling the power supply switching module to disconnect the power supply module from the battery module in response to the voltage of the battery module being less than or equal to a first preset voltage threshold.
S142: and controlling the first end of the voltage conversion module to be connected with the battery module in response to the voltage of the battery module being smaller than or equal to a first preset voltage threshold value, so that the voltage output by the second end of the voltage conversion module is larger than the voltage of the battery module.
S152: and in response to the voltage of the battery module being less than or equal to a first preset voltage threshold, the power supply module is powered by the communication interface, and the charging and discharging switch module is controlled to be enabled and communicated with the external charging equipment so that the external charging equipment charges the battery module through the charging and discharging switch module.
Optionally, after S120, the method further includes: and in response to the deep discharge instruction, controlling the battery module to continuously discharge until the voltage of the battery module is smaller than or equal to a first preset voltage threshold.
It should be also noted that, as will be understood by those skilled in the art, steps S122, S132, S142 and S152 may be performed simultaneously or sequentially, and the embodiment is not limited to the execution sequence of these steps, which can achieve the technical purpose of the embodiment, and are not repeated herein, and should be included in the protection scope of the present application.
The embodiment of the application also provides a battery management system, which comprises a memory and a processor, wherein the memory stores a computer program, and the processor realizes the management method of the battery pack when calling the computer program. The battery management system comprises the battery pack. The battery management system has the same beneficial effects as the battery pack, and will not be described in detail herein.
The embodiment of the application also provides an energy storage system, which comprises the battery pack described in the embodiment.
The foregoing embodiment numbers of the present application are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments.
In the present application, the same or similar term concept, technical solution and/or application scenario description will be generally described in detail only when first appearing and then repeatedly appearing, and for brevity, the description will not be repeated generally, and in understanding the present application technical solution and the like, reference may be made to the previous related detailed description thereof for the same or similar term concept, technical solution and/or application scenario description and the like which are not described in detail later.
In the present application, the descriptions of the embodiments are emphasized, and the details or descriptions of the other embodiments may be referred to.
The technical features of the technical scheme of the application can be arbitrarily combined, and all possible combinations of the technical features in the above embodiment are not described for the sake of brevity, however, as long as there is no contradiction between the combinations of the technical features, the application shall be considered as the scope of the description of the application.
From the above description of the embodiments, it will be clear to those skilled in the art that the above-described embodiment method may be implemented by means of software plus a necessary general hardware platform, but of course may also be implemented by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a storage medium (e.g. ROM/RAM, magnetic disk, optical disk) as above, comprising several instructions for causing the battery pack to perform the method of each embodiment of the present application.
The foregoing description is only of the preferred embodiments of the present application, and is not intended to limit the scope of the application, but rather is intended to cover any equivalents of the structures or equivalent processes disclosed herein or in the alternative, which may be employed directly or indirectly in other related arts.

Claims (10)

1. A battery pack, the battery pack comprising:
the battery module comprises at least one single battery;
the power supply interface is used for connecting external charging equipment or discharging external loads;
a communication interface for communicating with an external charging device;
the power supply module is used for supplying power to the control module;
a power supply switching module configured to selectively turn on or off a connection between the power supply module and at least one of the battery module, the power supply interface, and the communication interface to switch a power supply path of the power supply module;
the control module is used for obtaining the voltage of the battery module, and responding to the voltage of the battery module being smaller than or equal to a first preset voltage threshold value, the power supply switching module is controlled to conduct connection between the power supply module and the power supply interface and/or the communication interface.
2. The battery pack of claim 1, wherein the control module is further configured to control the power switching module to disconnect the power module from the battery module in response to the voltage of the battery module being less than or equal to a first preset voltage threshold.
3. The battery pack according to claim 1 or 2, further comprising:
the first end of the voltage conversion module can be selectively connected with the battery module, and the second end of the voltage conversion module is connected with the power interface;
the control module is further configured to control the first end of the voltage conversion module to be connected with the battery module in response to the voltage of the battery module being less than or equal to a first preset voltage threshold, so that the voltage output by the second end of the voltage conversion module is greater than the voltage of the battery module.
4. A battery pack according to claim 3, wherein the power supply switching module comprises a first switch, a common terminal of the first switch being connected to a positive terminal or a negative terminal of the battery module, a first selection terminal of the first switch being connected to the power supply module, a second selection terminal of the first switch being connected to the voltage conversion module; the first switch is used for responding to the voltage of the battery module to be smaller than or equal to a first preset voltage threshold value and communicating with the voltage conversion module.
5. The battery pack according to claim 1 or 2, further comprising a charge current limiting module connected in a charge-discharge path of the battery module;
The control module is further configured to determine a power supply path of the power supply module, and control the charging current limiting module to enable the external charging device to charge the battery module through the charging current limiting module in response to the voltage of the battery module being less than or equal to a first preset voltage threshold, and the power supply module being powered by the power supply interface.
6. The battery pack of claim 5, further comprising a charge-discharge switch module connected in a charge-discharge path of the battery module, the charge-discharge switch module being in parallel with the charge current limiting module;
the control module is further configured to control the charge-discharge switch module to be enabled and the charge current limiting module to be disabled in response to the voltage of the battery module being greater than the first preset voltage threshold, and/or control the power supply switch module to conduct connection between the power supply module and the battery module and to cut off connection between the power supply module and the power supply interface and/or the communication interface.
7. The battery pack of claim 5, further comprising a charge-discharge switch module connected in a charge-discharge path of the battery module, the charge-discharge switch module being in parallel with the charge current limiting module;
The control module is further used for controlling the charge-discharge switch module and the external charging equipment to communicate in response to the voltage of the battery module being smaller than or equal to a first preset voltage threshold, and the power supply module is powered by the communication interface, so that the external charging equipment charges the battery module through the charge-discharge switch module.
8. The battery pack of claim 1 or 2, wherein the control module is further configured to control the battery module to continue discharging until the voltage of the battery module is less than or equal to the first preset voltage threshold in response to obtaining a deep discharge command.
9. A method of managing a battery pack, the method comprising: the battery module comprises at least one single battery; the power supply interface is used for connecting external charging equipment or discharging external loads; a communication interface for communicating with an external charging device; the power supply module is used for supplying power to the control module; a power supply switching module configured to selectively turn on or off a connection between the power supply module and at least one of the battery module, the power supply interface, and the communication interface to switch a power supply path of the power supply module; the management method of the battery pack is executed by the control module;
The management method of the battery pack comprises the following steps:
acquiring the voltage of the battery module;
and controlling the power supply switching module to conduct connection between the power supply module and the power supply interface and/or the communication interface in response to the voltage of the battery module being smaller than or equal to a first preset voltage threshold.
10. A battery management system comprising a memory storing a computer program and a processor that when invoked implements the method of managing a battery pack according to claim 9.
CN202310943595.3A 2023-07-31 2023-07-31 Battery pack, management method thereof and battery management system Active CN116666788B (en)

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