CN115064798B

CN115064798B - Battery control method, battery and battery management system

Info

Publication number: CN115064798B
Application number: CN202210932979.0A
Authority: CN
Inventors: 施海驹; 黄成成
Original assignee: If New Energy Technology Jiangsu Co ltd
Current assignee: If New Energy Technology Jiangsu Co ltd
Priority date: 2022-08-04
Filing date: 2022-08-04
Publication date: 2022-12-02
Anticipated expiration: 2042-08-04
Also published as: CN115064798A

Abstract

The application relates to a control method of a battery, the battery and a battery management system. The method comprises the following steps: and acquiring the state parameters of the battery cell unit in the battery, and controlling the working state of at least one current limiting unit in the battery in response to the judgment result that the state parameters are greater than or equal to the charging state parameter threshold and/or the state parameters are less than or equal to the discharging state parameter threshold so as to adjust the charging parameters and/or the discharging parameters of the battery. By adopting the method, the charging parameter and/or the discharging parameter of the battery can be adjusted by utilizing the current limiting unit of the battery directly based on the comparison result of the state parameter and the parameter threshold value of the battery cell unit, so that the overcharge or over-discharge of the battery is avoided, and the service life of the battery, the charging equipment and/or the power utilization equipment is prolonged.

Description

Battery control method, battery and battery management system

Technical Field

The application relates to the technical field of new energy, in particular to a battery control method, a battery and a battery management system.

Background

In order to prolong the service life of the battery and prevent the battery from being overcharged or overdischarged during charging and discharging, the state of the battery needs to be monitored. For example, a battery management system is mounted on a lithium battery, the battery management system monitors the voltage state of the battery, and when it is detected that the battery voltage exceeds a charging threshold or is smaller than a discharging threshold, the battery management system controls a charging and discharging loop of the battery to be disconnected so as to protect the battery. However, in the process of charging and discharging the battery, the sudden disconnection of the charging and discharging circuit may affect the service life of the charging device or the electric device, and may cause great trouble to the electricity consumption experience of the user, even cause immeasurable loss.

The foregoing description is provided for general background information and is not admitted to be prior art.

Disclosure of Invention

In view of the above, there is a need to provide an efficient battery control method, a battery management system, a computer-readable storage medium and a computer program product, which can prevent overcharging or overdischarging of the battery and improve the service life of the battery, the charging device and/or the power consuming device.

To this end, in a first aspect, the present application provides a control method of a battery, the control method including:

acquiring state parameters of a cell unit in the battery;

and controlling the working state of at least one current limiting unit in the battery to adjust the charging parameter and/or the discharging parameter of the battery in response to the judgment result that the state parameter is greater than or equal to the charging state parameter threshold value and/or the state parameter is less than or equal to the discharging state parameter threshold value.

Optionally, with reference to any one of the above aspects, in another implementation manner of the present aspect, the at least one current limiting unit includes at least one first current limiting unit and at least one second current limiting unit;

the controlling the working state of at least one current limiting unit in the battery in response to the judgment result that the state parameter is greater than or equal to the threshold value of the charging state parameter to adjust the charging parameter of the battery comprises:

responding to a judgment result that the state parameter is larger than or equal to a first charging state parameter threshold value, and controlling to enable the at least one first current limiting unit;

continuously acquiring the state parameters of the battery cell units;

in response to a judgment result that the state parameter is greater than or equal to a second charging state parameter threshold value, controlling to enable the at least one second current limiting unit so that a voltage parameter of a charging port in the battery is greater than or equal to a protection threshold value of charging equipment, wherein the charging port is used for the charging equipment to charge the battery;

wherein the second state of charge parameter threshold is greater than the first state of charge parameter threshold.

Optionally, with reference to any one of the foregoing aspects, in another implementation manner of the present aspect, after the controlling enabling the at least one first current limiting unit in response to a determination result that the state parameter is greater than or equal to a first charging state parameter threshold, the method further includes:

judging whether the battery is in a charging state;

and responding to the judgment result that the battery is not in the charging state, and adjusting the first charging state parameter threshold value and/or the second charging state parameter threshold value.

Optionally, with reference to any one of the foregoing aspects, in another implementation manner of this aspect, the control method further includes:

responding to a judgment result that the battery is in a charging state, and continuously acquiring the state parameters of the battery cell unit;

after the controlling enabling the at least one second current limiting unit in response to the determination result that the state parameter is greater than or equal to the second charging state parameter threshold, the method further includes:

acquiring the time length from the time when the at least one first current limiting unit is enabled to the time when the at least one second current limiting unit is enabled;

and responding to a judgment result that the duration is greater than or equal to a preset duration threshold, and adjusting the first charging state parameter threshold and/or the second charging state parameter threshold.

the controlling the working state of at least one current limiting unit in the battery in response to the judgment result that the state parameter is less than or equal to the discharge state parameter threshold value to adjust the discharge parameter of the battery comprises:

responding to a judgment result that the state parameter is smaller than or equal to a first discharge state parameter threshold value, and controlling to enable the at least one first current limiting unit;

continuously acquiring the state parameters of the battery cell units;

responding to a judgment result that the state parameter is smaller than or equal to a second discharging state parameter threshold value, and controlling to enable the at least one second current limiting unit so that a voltage parameter of a discharging port in the battery is smaller than or equal to a protection threshold value of electric equipment, wherein the discharging port is used for the battery to provide power for the electric equipment;

wherein the second discharge state parameter threshold is less than the first discharge state parameter threshold.

periodically detecting a discharge current of the battery;

the controlling enabling of the at least one first current limiting unit in response to the determination result that the state parameter is less than or equal to the first discharge state parameter threshold value includes:

in response to a judgment result that the state parameter is smaller than or equal to a first discharging state parameter threshold value and the discharging current is larger than or equal to a discharging current threshold value, after delaying a first preset time or a first preset period, controlling to enable the at least one first current limiting unit; and/or the presence of a gas in the atmosphere,

and controlling to enable the at least one first current limiting unit in response to a judgment result that the state parameter is less than or equal to the first discharge state parameter threshold and the discharge current is less than the discharge current threshold.

Optionally, with reference to any one of the foregoing aspects, in another implementation manner of the present aspect, after the controlling enables the at least one first current limiting unit, the method further includes:

when the discharging current after the at least one first current limiting unit is enabled is detected to be larger than the discharging current before the at least one first current limiting unit is enabled, the at least one first current limiting unit is controlled to be disabled;

and after delaying a second preset time length or a second preset period, controlling to enable the at least one first current limiting unit.

and adjusting the first discharge state parameter threshold value and/or the second discharge state parameter threshold value according to the actual capacity parameter or the health degree parameter of the battery.

In a second aspect, the present application also provides a battery. The battery includes:

the battery cell unit comprises at least one battery cell;

the at least one current limiting unit is connected with the battery cell unit;

and the control unit is used for acquiring the state parameters of the battery cell unit, and controlling the working state of the at least one current limiting unit in response to the judgment result that the state parameters are greater than or equal to a charging state parameter threshold value and/or the state parameters are less than or equal to a discharging state parameter threshold value so as to adjust the charging parameters and/or the discharging parameters of the battery.

Optionally, with reference to any one of the above aspects, in another implementation manner of the present aspect, the at least one current limiting unit includes at least one first current limiting unit and at least one second current limiting unit:

the first current limiting unit comprises at least one first current limiting resistor and at least one first current limiting switch;

the second current limiting unit comprises at least one second current limiting resistor and at least one second current limiting switch.

Optionally, in combination with any one of the above aspects, in another implementation manner of the present aspect, the battery further includes:

a charging port for a charging device to charge the battery;

the control unit is further configured to:

continuously acquiring the state parameters of the battery cell units;

responding to a judgment result that the state parameter is larger than or equal to a second charging state parameter threshold value, and controlling to enable the at least one second current limiting unit so that the voltage parameter of the charging port is larger than or equal to a protection threshold value of the charging equipment;

Optionally, with reference to any one of the above aspects, in another implementation manner of the present aspect, the battery further includes:

a discharge port for the battery to provide power to a powered device;

the control unit is further configured to:

continuously acquiring the state parameters of the battery cell units;

responding to a judgment result that the state parameter is smaller than or equal to a second discharge state parameter threshold value, and controlling to enable the at least one second current limiting unit so that the voltage parameter of the discharge port is smaller than or equal to a protection threshold value of the electric equipment;

In a third aspect, the present application further provides a battery management system. The battery management system comprises a storage module and a processing module, wherein the storage module stores a computer program, and the processing module realizes the control method of the battery according to any embodiment of the first aspect when executing the computer program.

In a fourth aspect, the present application further provides a computer-readable storage medium. The computer-readable storage medium, on which a computer program is stored, which, when executed by a processor, implements the method of controlling a battery according to any of the embodiments of the first aspect described above.

In a fifth aspect, the present application further provides a computer program product. The computer program product includes a computer program, and the computer program realizes the control method of the battery according to any one of the embodiments of the first aspect when executed by a processor.

The above-mentioned battery control method, battery management system, computer-readable storage medium and computer program product may be configured to control the operating state of the at least one current limiting unit to adjust the charging parameter and/or the discharging parameter of the battery by obtaining the state parameter of the cell unit in the battery, and in response to the determination result that the state parameter is greater than or equal to the charging state parameter threshold and/or the state parameter is less than or equal to the discharging state parameter threshold, so as to adjust the charging parameter and/or the discharging parameter of the battery by using the current limiting unit of the battery directly based on the comparison result between the state parameter and the parameter threshold of the cell unit, thereby avoiding overcharge or overdischarge of the battery and improving the service life of the battery, the charging device and/or the electric device.

The above summary is provided to introduce a selection of concepts in a simplified form that are further described below in the detailed description. The above summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter. The claimed subject matter is not limited to implementations that solve any or all disadvantages noted in the background.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and, together with the description, serve to explain the principles of the application. In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the description of the embodiments will be briefly described below, and it is obvious for those skilled in the art to obtain other drawings without inventive step. These drawings and written description are not intended to limit the scope of the inventive concepts in any manner, but rather to illustrate the inventive concepts to those skilled in the art by reference to specific embodiments.

FIG. 1a is a schematic flow chart illustrating a method for controlling a battery according to one embodiment;

FIG. 1b is a first schematic diagram of a current limiting unit according to an embodiment;

FIG. 1c is a diagram illustrating a second embodiment of a current limiting unit;

FIG. 1d is a schematic diagram of a third embodiment of a current limiting unit;

FIG. 1e is a fourth schematic diagram of a current limiting unit in an embodiment;

FIG. 2 is a schematic flow chart illustrating a charging parameter adjustment step according to an embodiment;

FIG. 3 is a schematic flow chart illustrating the discharge parameter adjustment step according to one embodiment;

FIG. 4 is a first flowchart illustrating a method for controlling a battery according to another embodiment;

FIG. 5 is a second flowchart illustrating a battery control method according to another embodiment;

FIG. 6 is a block diagram showing the structure of a battery in one embodiment;

FIG. 7a is a first schematic diagram of a battery circuit according to an embodiment;

FIG. 7b is a diagram illustrating a second exemplary battery circuit.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the application, as detailed in the appended 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 of 8230, and" comprising 8230does not exclude the presence of additional like elements in a process, method, article, or apparatus comprising 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. Also, as used herein, the terms "or," "and/or," "including at least one of the following," and the like, are to be construed as inclusive or meaning any one or any combination. An exception to this definition will occur only when a combination of elements, functions, steps or operations are inherently mutually exclusive in some way.

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 type of parameter or module from another. 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 \8230; \8230when" or "when 8230; \823030, when" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrase "if determined" or "if detected (a stated condition or event)" may be interpreted as "upon determining" or "in response to determining" or "upon detecting (a stated condition or event)" or "in response to detecting (a stated condition or event)", depending on the context. Furthermore, the parts, features and elements that have the same name in different embodiments of the application may have the same meaning or may have different meanings, and the specific meaning thereof should be determined by the explanation thereof in the specific embodiment or further by combining the context in the specific 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, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and may be performed in other orders unless otherwise indicated herein. Moreover, at least some of the steps in the figures may include multiple sub-steps or multiple stages that are not necessarily performed at the same time, but may be performed at different times, in different orders, and may be performed alternately or at least partially with respect to other steps or sub-steps of other steps.

It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

In one embodiment, as shown in FIG. 1a, a method of controlling a battery is provided. The control method of the battery provided in this embodiment includes the steps of:

step S102, obtaining state parameters of the battery cell unit in the battery.

Optionally, in this embodiment, the cell unit may include at least one cell, and a plurality of cells may be connected to form a cell array. Generally, the battery cell is composed of a positive electrode material, a negative electrode material, an electrolyte, a diaphragm and a casing, and the form of the battery cell may be a square-casing battery cell, a cylindrical battery cell or a soft-package battery cell, and the specific structure or form of the battery cell is not limited in this embodiment.

Optionally, in this embodiment, the State parameter may include, but is not limited to, one or more Of a SOC parameter (State Of Charge), a voltage parameter, a current parameter, a temperature parameter, and the like. Specifically, a state parameter detection sensor may be disposed in the battery, and the battery may detect the state parameter of the electric core unit by using the state parameter detection sensor, send the acquired signal to a battery management system in the battery, and convert the signal into the state parameter of the electric core unit by using the battery management system. As a preferred implementation, in this embodiment, a voltage value or an SOC value of a cell unit in the battery is obtained.

Optionally, in this embodiment, the state parameter of each battery cell in the battery cell unit may be detected, so as to obtain the state parameter of the battery cell unit in the battery; the state parameter detection sensor may also be used to detect the state parameter of the entire battery cell unit formed by all the battery cells in the battery cell unit. The state parameters of the battery cell unit may be obtained in real time, or may also be obtained periodically. Specifically, as a preferred embodiment, the state parameter of each battery cell in the battery cell unit is detected, and when the battery is in a charging state, the maximum value of the acquired state parameters of all the battery cells is used as the state parameter of the battery cell unit; when the battery is in a discharging state, the minimum value of the acquired state parameters of all the battery cells is used as the state parameter of the battery cell unit, so that each battery cell cannot be overcharged or overdischarged when the charging parameter and/or the discharging parameter of the battery are/is adjusted.

In one example, the state parameter detecting sensor may be a sensor already disposed in the battery, or may be a state sensing device additionally disposed in the battery, such as a voltage sensor, a current sensor, a temperature sensor, or the like.

Step S104, responding to the judgment result that the state parameter is larger than or equal to the charging state parameter threshold value and/or the state parameter is smaller than or equal to the discharging state parameter threshold value, controlling the working state of at least one current limiting unit so as to adjust the charging parameter and/or the discharging parameter of the battery.

Optionally, in this embodiment, the threshold of the state of charge parameter is used to characterize a charging degree of the cell unit when the battery is in a charging state. For example, the threshold value of the state of charge parameter may be an SOC parameter of the cell unit, which is used to characterize a full charge degree when the battery is in a state of charge, for example, an SOC of 95% indicates that the battery is about to be fully charged, and an SOC of 100% indicates that the battery is fully charged. Alternatively, the voltage parameter of the cell unit may be used to characterize the charging degree of the cell unit, for example, a cell voltage of 3.40V indicates that the battery is about to be fully charged, a cell voltage of 3.43V indicates that the battery is fully charged, and the like. Similarly, the discharge state parameter threshold is used to characterize the discharge degree of the cell unit when the battery is in a discharge state, and may be characterized by an SOC parameter or a voltage parameter of the cell unit. The charge state parameter threshold and the discharge state parameter threshold may be preset in the battery management system according to specifications of the battery cell, and may be set by referring to a product specification of the battery cell. Alternatively, the charge state parameter threshold and the discharge state parameter threshold may not be fixed values, and the parameter thresholds may be updated by upgrading a program or manually modifying, etc., as will be further described in the following embodiments.

Optionally, in this embodiment, the at least one current limiting unit may be configured to limit a charging current or a discharging current in a charging/discharging loop of the battery. The number of the current limiting units can be one or more, each current limiting unit has a certain resistance value, and a battery management system of the battery can generate a control signal according to the judgment result and apply the control signal to the current limiting units, so that the current limiting units can adjust the working states of the current limiting units according to the control signal. In one example, the current limiting unit may include, but is not limited to, a current limiting switch and a current limiting resistor, the current limiting switch may be used to adjust an operating state of the current limiting unit in the circuit according to the control signal, and the current limiting resistor is used to limit a charging current or a discharging current in the charging and discharging loop. For example, when the current-limiting switch is turned on, the current-limiting unit is enabled, and the current-limiting resistor plays a role in limiting current; when the current-limiting switch is turned off, the current-limiting unit is disabled, and the current-limiting resistor does not work. The current limiting switch in the current limiting unit can be an MOS tube, a triode, an IGBT, a relay and other components with switching functions, and the on-off state of the switch can be changed under the driving of a control signal, so that the working state of the current limiting unit is adjusted. The current-limiting resistor in the current-limiting unit may be a high-power non-adjustable resistor, or may also be an adjustable resistor, or may also be a resistor combination formed by connecting multiple resistors in series and/or in parallel. It should be noted that the current limiting unit in this embodiment is not limited to the above-mentioned embodiment, and is within the protection scope of this embodiment as long as the purposes of controlling the operating state and limiting the current can be achieved.

Optionally, in this embodiment, the charging parameter may be used to represent a charging performance parameter output by the charging device to the battery in the charging state of the battery, or may be a charging performance parameter received by the battery from the outside, where the charging performance parameter may be any one or more of a charging voltage value, a charging current value, and a charging power. Likewise, the discharge parameter may be used to characterize a discharge performance parameter output by the battery to the electric device in a discharge state of the battery, and the discharge performance parameter may be any one or more of a discharge voltage value, a discharge current value, and a discharge power.

In this embodiment, a control unit (which may be implemented by a battery management system BMS of the battery) may be disposed in the battery, and a charge state parameter threshold value and/or a discharge state parameter threshold value is pre-stored in the control unit. The battery can judge the state parameters of the battery cell unit through the control unit, and determine that the battery cell unit is currently in a charging state or determine that the battery cell unit is currently in a discharging state.

And under the condition of a charging state, comparing the acquired state parameter of the battery cell unit with a charging state parameter threshold value, and generating a judgment result of comparison between the state parameter and the charging state parameter threshold value. And controlling the working state of at least one current limiting unit to change in response to the judgment result that the state parameter is greater than or equal to the charging state parameter threshold value so as to reduce the charging parameter of the battery. And in response to the judgment result that the state parameter is smaller than the charging parameter threshold value, controlling the working state of at least one current limiting unit to be kept unchanged, and continuing to repeat the step S102.

And under the condition of a discharging state, comparing the state parameter of the battery cell unit with a discharging state parameter threshold value, and generating a judgment result of comparing the state parameter with the discharging state parameter threshold value. And controlling the working state of at least one current limiting unit to change in response to the judgment result that the state parameter is less than or equal to the discharge state parameter threshold value so as to reduce the discharge parameter of the battery. And in response to the judgment result that the state parameter is larger than the discharge parameter threshold value, controlling the working state of at least one current limiting unit and the loop switch unit to be kept unchanged, and continuously repeating the step S102.

Optionally, in this embodiment, the battery may further include a loop switch unit, where the loop switch unit is configured to characterize a total loop switch of the battery charging and discharging circuit. In one example, the loop switch unit may include a main loop discharge switch fet and a main loop charge switch fet, and the main loop discharge switch fet and the main loop charge switch fet may be connected in series or in parallel. When the field effect transistor of the main loop discharge switch is switched on or off, the battery cell unit can be controlled to discharge or stop discharging; when the field effect transistor of the main loop charging switch is switched on or switched off, the charging of the cell unit can be controlled or stopped.

Optionally, in this embodiment, the loop switch unit is connected to the at least one current limiting unit, and both are controlled by the battery management system of the battery to control the operating states of the loop switch unit and the current limiting unit. The loop switch unit may be connected in series or in parallel with the current limiting unit, and the protection scope of the embodiment is within the scope as long as the purpose that the working states of the loop switch unit and the current limiting unit can be controlled independently can be achieved. The connection mode of the two is not limited in this embodiment, and the connection mode of the two will be further described in detail in the embodiments of fig. 1b, fig. 1c, fig. 1d and fig. 1e of the present application.

In one example, as shown in fig. 1b, 1c, 1d and 1e, various connection embodiments of the current limiting unit and the loop switch unit are provided, and the enabling or disabling of the current limiting unit may be implemented by controlling the operating state of the current limiting unit switch. It should be noted that enabling the current limiting unit means that the current limiting unit is put into a working state, and when the current limiting unit is put into the working state, the charging and discharging current of the battery flows through the current limiting unit; the disabling current limiting unit means that the current limiting unit does not operate, and in this case, the charge and discharge current of the battery does not flow through the current limiting unit. Under different connection modes of the current limiting unit and the loop switch unit, different control modes can be provided for achieving the purpose of controlling the working state of the current limiting unit.

As shown in fig. 1b, 1c, 1d and 1e, K1 and K2 may be a charging MOS transistor and a discharging MOS transistor of the circuit switching unit, and the charging MOS transistor K1 and the discharging MOS transistor K2 may be connected in series, in which case, the charging MOS transistor K1 and the discharging MOS transistor K2 may be formed by selecting MOSFETs or IGBTs with the same specification; in another possible implementation, for the battery, the charging current is generally much smaller than the discharging current, so the charging MOS transistor K1 and the discharging MOS transistor K2 may be connected in parallel, in which case, the charging MOS transistor in the current limiting unit used in the charging state may be selected as the MOS transistor with lower parameter requirement, and the discharging MOS transistor used in the discharging state may be selected as the MOS transistor with higher parameter requirement. Therefore, compared with a series connection mode, the parameter requirement of the charging MOS tube is reduced, and the device cost of the charging MOS tube can be saved. K3 and K4 may be switches of the current limiting unit, and R1 and R2 may be current limiting resistors of the current limiting unit. The switch K3 and the current limiting resistor R1 form a first current limiting unit, and the switch K4 and the current limiting resistor R2 form a second current limiting unit.

Specifically, the initial state of the charging MOS transistor K1 and/or the discharging MOS transistor K2 of the circuit switch unit may be a conducting state, and the initial state of the current limiting unit is a disabling state, so that the battery charges/discharges the battery through the circuit switch unit.

In the case that the current limiting unit and the loop switch unit are connected as shown in fig. 1b, the switch K3 of the current limiting unit may be in an initial state of an off state. And in response to the judgment result that the state parameter is greater than or equal to the charging state parameter threshold and/or the state parameter is less than or equal to the discharging state parameter threshold, controlling a switch K3 of the current limiting unit to be switched on, and switching off a charging MOS tube K1 and/or a discharging MOS tube K2, so that the current limiting unit works, performs current limiting operation, and reduces the charging parameter and/or the discharging parameter of the battery.

In the case that the current limiting unit and the loop switch unit are connected as shown in fig. 1c, the initial state of the switch K3 of the first current limiting unit may be an off state, and the initial state of the switch K4 of the second current limiting unit may be an off or on state. And in response to the judgment result that the state parameter is greater than or equal to the charging state parameter threshold and/or the state parameter is less than or equal to the discharging state parameter threshold, controlling to enable the first current limiting unit, for example, controlling the switch K3 and the switch K4 to be switched on, and switching off the charging MOS tube K1 and/or the discharging MOS tube K2. And controlling to enable the second current limiting unit, such as controlling the switch K4 to be switched off in response to the judgment result that the state parameter is greater than or equal to the second charging state parameter threshold value and/or the state parameter is less than or equal to the second discharging state parameter threshold value.

In the case that the current limiting unit and the loop switch unit are connected as shown in fig. 1d, the initial states of the switches K3 and K4 of the first and second current limiting units may be off states. And in response to the judgment result that the state parameter is greater than or equal to the charging state parameter threshold and/or the state parameter is less than or equal to the discharging state parameter threshold, controlling the enabling first current limiting unit, such as controlling the switch K3 to be switched on, and switching off the charging MOS transistor K1 and/or the discharging MOS transistor K2. And in response to the judgment result that the state parameter is greater than or equal to the second charging state parameter threshold value and/or the state parameter is less than or equal to the second discharging state parameter threshold value, controlling to enable the second current limiting unit, for example, controlling the switch K4 to be switched on and the switch K3 to be switched off.

In the case that the connection manner of the current limiting unit and the loop switch unit is as shown in fig. 1e, the initial states of the switches K3 and K4 of the first and second current limiting units may be turned on. And in response to the judgment result that the state parameter is greater than or equal to the charging state parameter threshold and/or the state parameter is less than or equal to the discharging state parameter threshold, controlling the enabling first current limiting unit, for example, keeping the charging MOS transistor K1 and/or the discharging MOS transistor K2 on, and controlling the switch K3 to be switched off. And controlling the second current limiting unit to be enabled, for example, controlling the switch K4 to be switched off in response to the judgment result that the state parameter is greater than or equal to the second charging state parameter threshold value and/or the state parameter is less than or equal to the second discharging state parameter threshold value.

In one example, an initial state of at least one current limiting unit in the battery may be an inactive state, and an initial state of the circuit switching unit may be an active state, so that the battery is charged or discharged through the circuit switching unit in the initial state. The battery can respond to the judgment result that the state parameter is larger than or equal to the charging state parameter threshold and/or the state parameter is smaller than or equal to the discharging state parameter threshold, the working states of the current limiting unit and the loop switch unit are controlled and adjusted, such as at least one current limiting unit is controlled and enabled, and the loop switch unit is controlled to be disconnected from the circuit loop, so that the charging parameter and/or the discharging parameter of the battery are/is reduced by charging or discharging the battery through the current limiting unit rather than through the loop switch unit. Alternatively, in response to the determination result that the state parameter is greater than or equal to the charging state parameter threshold and/or the state parameter is less than or equal to the discharging state parameter threshold, the at least one current limiting unit is enabled, and the loop switch unit is controlled to keep the state of the conducting circuit loop unchanged, so that the charging parameter and/or the discharging parameter of the battery are/is reduced by simultaneously charging or discharging through the current limiting unit and the loop switch unit which are connected in series with each other. Or, the at least one current limiting unit can be controlled and enabled in response to the judgment result that the state parameter is greater than or equal to the charging state parameter threshold and/or the state parameter is less than or equal to the discharging state parameter threshold, so that the charging parameter and/or the discharging parameter of the battery are/is reduced by charging or discharging the battery through the current limiting unit rather than through the loop switch unit.

As a possible implementation manner, a current sensor is disposed in the battery, and a current parameter of the cell unit is obtained through the current sensor, so as to determine that the cell unit is currently in a charging state, or determine that the cell unit is currently in a discharging state. For example, when the current parameter acquired by the current sensor to the cell unit is less than zero, it is determined that the battery is in a charging state. And under the condition that the current parameter acquired by the current sensor to the battery cell unit is larger than zero, determining that the battery is in a discharging state. And under the condition that the current parameter acquired by the current sensor to the battery cell unit is equal to zero, determining that the battery is in a standing or dormant state.

In this embodiment, in the control method of the battery, the state parameter of the cell unit in the battery is obtained, and the operating states of the at least one current limiting unit and the circuit switch unit are controlled in response to the determination result that the state parameter is greater than or equal to the charge state parameter threshold and/or the state parameter is less than or equal to the discharge state parameter threshold, so as to adjust the charge parameter and/or the discharge parameter of the battery, and the charge parameter and/or the discharge parameter of the battery can be adjusted by using the at least one current limiting unit of the battery directly based on the comparison result between the state parameter of the cell unit and the parameter threshold, so that overcharge or overdischarge of the battery is avoided, and the service life of the battery, the charging equipment and/or the electric device is prolonged.

Optionally, in one embodiment, the battery further comprises a charging port through which the battery is connected to a charging device. The at least one current limiting unit includes at least one first current limiting unit and at least one second current limiting unit, and the at least one first current limiting unit and the at least one second current limiting unit are connected in series or in parallel, and the specific configuration and functions thereof are the same as those of the current limiting units described in the foregoing fig. 1b, fig. 1c, fig. 1d, and fig. 1e, and are not described again here.

As shown in fig. 2, step S104, in response to the determination result that the state parameter is greater than or equal to the charging state parameter threshold and/or the state parameter is less than or equal to the discharging state parameter threshold, controlling the operating state of at least one current limiting unit to adjust the charging parameter and/or the discharging parameter of the battery, includes:

step S202, in response to the determination result that the state parameter is greater than or equal to the first charging state parameter threshold, controlling to enable at least one first current limiting unit.

Optionally, in this embodiment, the current limiting unit may include a plurality of current limiting branches, where different current limiting branches have different resistances and correspond to different state parameter thresholds, and the different state parameter thresholds correspond to different charge and discharge stages, that is, different state control points, and the higher the charge and discharge stage corresponding to the control point is, the larger the resistance of the current limiting branch in the access circuit corresponding to the control point is, so as to change the charge parameter. Therefore, a battery management system of the battery may be pre-stored with a first charging state parameter threshold corresponding to the at least one first current limiting unit and a second charging state parameter threshold corresponding to the at least one second current limiting unit. When the charging device charges the battery, the initial state of the at least one first current limiting unit and the at least one second current limiting unit in the battery may be an inactive state.

Optionally, in this embodiment, a plurality of current limiting branches in the current limiting unit may also have the same resistance value, and the plurality of current limiting branches are connected in series. The first soc parameter threshold may correspond to a current limiting unit, and the second soc parameter threshold may correspond to a plurality of current limiting units.

Specifically, when the battery is in a charging state, the at least one first current limiting unit is enabled in response to a determination result that the state parameter is greater than or equal to the first charging state parameter threshold, so that the battery is charged through the at least one first current limiting unit. At this time, the voltage parameter at the charging port of the battery is equal in value to the sum of the voltage parameter of the electric core unit and the voltage parameter of the at least one first current limiting unit, so that the charging parameter of the battery is reduced. The sum of the voltage parameter of the battery cell unit and the voltage parameter of the at least one first current limiting unit is slightly smaller than the protection threshold value of the charging equipment, and the charging equipment can continue to charge the battery. Or, after the at least one first current limiting unit is enabled, the loop switch unit is maintained in a conductive working state, so that the battery is charged through the at least one first current limiting unit and the loop switch unit at the same time. Generally, when the battery is about to be fully charged, the charging device charges the battery at a constant voltage, and thus when the at least one first current limiting unit is enabled, the charging current parameter is decreased due to an increase in resistance in the entire charging loop.

And step S204, continuously acquiring the state parameters of the battery cell unit.

In step S206, in response to the determination result that the state parameter is greater than or equal to the second charging state parameter threshold, at least one second current limiting unit is controlled to be enabled.

Optionally, in this embodiment, after the battery controls and enables the at least one first current limiting unit, the state parameter of the electric core unit continues to be acquired, and a specific method for acquiring the state parameter is the same as the manner described above, and is not described herein again. And comparing the currently acquired state parameter with a second charging state parameter threshold, controlling to enable the at least one second current limiting unit in response to a judgment result that the state parameter is greater than or equal to the second charging state parameter threshold, and disconnecting the at least one first current limiting unit so as to charge the battery through the at least one second current limiting unit. And at the moment, the voltage parameter at the charging port of the battery is equal to the sum of the voltage parameter of the electric core unit and the voltage parameter of the at least one second current-limiting unit in value, so that the voltage parameter of the charging port is greater than or equal to the protection threshold value of the charging equipment, the charging equipment is triggered to stop charging the battery, and the charging operation of the battery is finished, so that the charging parameter of the battery is zero. As a possible implementation, generally speaking, a charging device, with or without a communication function, generally has an overvoltage protection function, which detects the voltage value of the battery at the charging port, and when the voltage value is greater than or equal to a protection threshold, the charging device automatically stops charging the battery. In this embodiment, when the state parameter of the battery is greater than or equal to the second charging state parameter threshold, the control unit enables the at least one second current limiting unit, so that the voltage of the battery port detected by the charging device exceeds the protection value of the charging device, triggers the charging device to stop charging the battery, and ends the charging operation of the battery, so that the charging parameter of the battery is zero. Wherein the protection threshold of the charging device may be determined according to a maximum theoretical voltage of the battery. In the embodiment, the situation that the charging equipment is damaged due to overlarge charging voltage caused by sudden disconnection of the charging MOS tube when the battery is fully charged and continuous charging of the charging equipment is avoided, the mode that the charging equipment actively enters overvoltage protection in advance to cut off the charging power is adopted, the problem that the battery is overcharged, the charging equipment cannot be damaged due to high voltage is solved, and the service life of the battery and/or the charging equipment is prolonged.

Optionally, in this embodiment, in response to a determination result that the state parameter is greater than or equal to the second charging state parameter threshold, the battery may also control to enable the at least one first current limiting unit and the at least one second current limiting unit, so that the battery may be charged through the at least one first current limiting unit and the at least one second current limiting unit. In this embodiment, the at least one first current limiting unit and the at least one second current limiting unit may be connected in series, so that when the at least one first current limiting unit and the at least one second current limiting unit are enabled for control, the resistance value of the at least two current limiting units is connected at the same time, and the resistance value is greater than the resistance value of the at least one first current limiting unit, which can also achieve the aforementioned effect.

Optionally, in this embodiment, the battery may further include a loop switch unit, and an initial state of the loop switch unit is an operating state. And in the charging process of the battery, in response to a judgment result that the state parameter is greater than or equal to the first charging state parameter threshold value, controlling to enable the at least one first current limiting unit, and disconnecting the loop switch unit after a preset time interval so as to charge the battery through the at least one first current limiting unit. In this embodiment, the charging state can be smoothly switched by controlling the at least one first current limiting unit to be enabled and then turning off the loop switch unit, thereby avoiding the charging current ripple caused by turning off the loop switch unit.

Optionally, in this embodiment, the second threshold value of the state of charge parameter may be greater than the first threshold value of the state of charge parameter. The first state of charge parameter threshold and the second state of charge parameter threshold may be determined based on an SOC parameter of the battery during charging. In one example, the first state-of-charge parameter threshold may be determined according to a corresponding voltage parameter of the cell unit with the SOC parameter of 97%. The second SOC parameter threshold may be determined according to a voltage parameter corresponding to the cell unit with the SOC parameter of 99% or 99.5%.

In one example, the battery may determine that the charging operation is finished when the charging parameter is zero, and control the at least one first current limiting unit, the at least one second current limiting unit, and the loop switch unit to return to the initial state, so that the battery may still be charged through the loop switch unit when the battery is charged next time.

In another example, the second current limiting unit may be more capable of adjusting the charging parameter than the first current limiting unit. For example, the resistance of the second current limiting unit may be greater than the resistance of the first current limiting unit, so that the charging parameter when the battery is charged through the at least one second current limiting unit is smaller than the charging parameter when the battery is charged through the at least one first current limiting unit.

In another example, the battery may control the loop switch unit to be turned off immediately after the control enables the at least one first current limiting unit; or, after the control enables the at least one first current limiting unit, the loop switch unit is controlled to be turned off after a short time delay.

In yet another example, the number of current limiting units is not limited to two, and may include three, four, or more, where each current limiting unit corresponds to a different charging parameter threshold, so that the charging parameter may be decreased step by step until the charging device is triggered to stop charging the battery.

In the embodiment, by setting a plurality of charging state parameter thresholds and a plurality of current limiting units, in the process of charging the battery, the current charging and discharging stage of the battery is determined by comparing the first charging state parameter threshold and the second charging state parameter threshold with the state parameters, so as to control the corresponding current limiting branches to work and limit the charging current of the battery, and as the state parameters of the battery continuously increase, the current limiting units with larger current limiting capacity are sequentially adopted to limit the current, so that the problem that the charging circuit of the battery is immediately disconnected when the battery management system is over-charged and protected can be avoided, and the service lives of the battery and the charging equipment are prolonged.

In one embodiment, after the step S202, in response to the determination result that the state parameter is greater than or equal to the first soc parameter threshold, the method further includes: and judging whether the battery is in a charging state, and adjusting the first charging state parameter threshold value and/or the second charging state parameter threshold value in response to the judgment result that the battery is not in the charging state.

Specifically, in this embodiment, the battery may obtain the current parameter of the battery cell unit after controlling to enable the at least one first current limiting unit in response to the determination result that the state parameter is greater than or equal to the first charging state parameter threshold. And judging whether the battery is in a charging state or not according to the current parameter, and obtaining a judgment result that the battery is not in the charging state under the condition that the current parameter is zero.

In response to a determination that the battery is not in a charging state, the first charging state parameter threshold may be adjusted such that the first charging state parameter threshold is decreased; or, the second charge-discharge state parameter threshold may also be adjusted, so that the second charge-discharge state parameter threshold is reduced; or, the first charge state parameter threshold and the second charge state parameter threshold may be adjusted, so that both the first charge state parameter threshold and the second charge state parameter threshold are reduced.

In one example, when the battery is aged or meets a charging device with different protection thresholds or the first charging state parameter threshold and/or the second charging state parameter threshold is set unreasonably, it may happen that the charging device stops charging the battery after the at least one first current limiting unit is enabled and before the at least one second current limiting unit is not enabled, that is, stops charging when the state parameter of the cell unit is smaller than the second charging state parameter threshold; alternatively, it is easy to stop charging before the at least one first current limiting unit is not enabled, i.e. in case the state parameter of the cell unit is smaller than the first charge state parameter threshold value. At this time, the first charging state parameter threshold and/or the second charging state parameter threshold may be set too large, and appropriate adjustment is required to be performed to reduce the first charging state parameter threshold and/or the second charging state parameter threshold, so that the first charging state parameter threshold and/or the second charging state parameter threshold are/is suitable for battery control scenarios in which the protection thresholds of the charging device corresponding to the aged battery or the battery are different or the setting of the discharging state parameter threshold is unreasonable.

In this embodiment, after the at least one first current limiting unit is enabled, whether the battery is in the charging state is determined, and the first charging state parameter threshold and/or the second charging state parameter threshold are/is adjusted in response to the determination result that the battery is not in the charging state, so that the battery control method can be applied to application scenarios under the conditions of battery aging, different protection thresholds of charging equipment, and the like, and the universality and the adaptability of the battery control method are improved.

In one embodiment, after the step S202, in response to the determination result that the state parameter is greater than or equal to the first soc parameter threshold, the method further includes: and in response to the determination result that the battery is in the charging state, executing step S204 to continue to acquire the state parameters of the cell unit.

In step S206, after the controlling enabling of the at least one second current limiting unit in response to the determination result that the state parameter is greater than or equal to the second charging state parameter threshold, the method further includes: and acquiring the time length from the time when the at least one first current limiting unit is enabled to the time when the at least one second current limiting unit is enabled, and adjusting the first charging state parameter threshold value and/or the second charging state parameter threshold value in response to the judgment result that the time length is greater than or equal to the preset time length threshold value.

Specifically, in this embodiment, the battery may record the time when the at least one first current limiting unit is enabled after the at least one first current limiting unit is enabled. And under the condition that the current parameter of the battery cell unit is not zero, obtaining a judgment result that the battery is in a charging state, and continuously obtaining the state parameter of the battery cell unit. And comparing the state parameter of the battery cell unit with a second charging state parameter threshold, responding to a judgment result that the state parameter is greater than or equal to the second charging state parameter threshold, controlling to enable the at least one second current limiting unit, and recording the time when the at least one second current limiting unit is enabled.

And determining the time period from the enabling of the at least one first current limiting unit to the enabling of the at least one second current limiting unit according to the enabling time of the at least one first current limiting unit and the enabling time of the at least one second current limiting unit. The duration is compared with a preset duration threshold, and the first charging state parameter threshold and/or the second charging state parameter threshold can be adjusted in response to a judgment result that the duration is greater than or equal to the preset duration threshold.

In one example, the battery may maintain the first and/or second state of charge parameter thresholds in response to a determination that the duration is less than the preset duration threshold.

In one example, when the time period from the enabling of the at least one first current limiting unit to the enabling of the at least one second current limiting unit is long, the first charging state parameter threshold may be too small, or the second charging state parameter threshold may be too large. In this case, it may occur that the battery is charged in a state of being attached with the first current limiting unit for a long time, so that excessive energy is consumed by the first current limiting unit, affecting charging efficiency and speed. Therefore, it is necessary to appropriately adjust the first soc threshold and/or the second soc threshold, such as increasing the first soc threshold or decreasing the second soc threshold, so as to enable the at least one first current limiting unit to the at least one second current limiting unit in a shorter time, thereby improving the charging efficiency and speed.

In this embodiment, after the at least one first current limiting unit is enabled, the state parameter of the electric core unit is continuously obtained under the condition that the battery is still in the charging state, the at least one second current limiting unit is enabled based on the comparison result of the state parameter and the second charging state parameter threshold, and after the at least one second current limiting unit is controlled to be enabled, the first charging state parameter threshold and/or the second charging state parameter threshold is/are adjusted according to the time length from the enabling of the at least one first current limiting unit to the enabling of the at least one second current limiting unit, so that the first charging state parameter threshold and/or the second charging state parameter threshold can be more suitable for the charging scenario of the battery, and the control accuracy of the battery control method is improved. In addition, the adjustment of the first charging state parameter threshold and/or the second charging state parameter threshold is beneficial to shortening the time length from the enabling of the at least one first current limiting unit to the enabling of the at least one second current limiting unit, so that the power loss in the battery control process can be reduced, and the charging efficiency and the charging speed can be improved.

In one embodiment, the battery further comprises a discharge port through which the battery is connected to the powered device. The at least one current limiting unit comprises at least one first current limiting unit and at least one second current limiting unit.

As shown in fig. 3, step S104, in response to the determination result that the state parameter is greater than or equal to the charging state parameter threshold and/or the state parameter is less than or equal to the discharging state parameter threshold, controlling the operating state of at least one current limiting unit to adjust the charging parameter and/or the discharging parameter of the battery, includes:

step S302, in response to the determination result that the state parameter is less than or equal to the first discharging state parameter threshold, controlling to enable at least one first current limiting unit.

Optionally, in this embodiment, when the battery is in a discharge state, the current limiting unit with multiple current limiting branches may also be used to perform over-discharge protection on the battery discharge, so as to prolong the life of the battery and/or the electrical device.

Optionally, in this embodiment, a first discharging state parameter threshold and a second discharging state parameter threshold may be pre-stored in the battery, the first discharging state parameter threshold corresponds to the at least one first current limiting unit, the second discharging state parameter threshold corresponds to the at least one second current limiting unit, and an initial state of the at least one first current limiting unit and the at least one second current limiting unit in the battery is an inactive state. Under the condition that the battery is in a discharging state, the battery can respond to the judgment result that the state parameter is smaller than or equal to the first discharging state parameter threshold value, and the at least one first current limiting unit is controlled to enable the battery to discharge through the at least one first current limiting unit, so that the discharging parameter of the battery is reduced. It should be noted that, in this embodiment, the specific configuration and control manner of the current limiting unit are the same as those of the current limiting unit described in the foregoing embodiment, so that all the embodiments of the current limiting unit described above are applicable to this embodiment and are referred to in this embodiment, and are not described again here.

In one example, in the discharging process of the battery to the electric device, firstly, the electric quantity of the battery is sufficient, the battery can be discharged to the electric device through the circuit switch unit, and at this time, the voltage parameter at the discharge port of the battery is equal to the voltage parameter of the cell unit. Then, the electric quantity of the battery is gradually reduced, when the state parameter of the electric core unit is smaller than the first discharging state parameter threshold value, a low-voltage reminding stage of the battery is started (namely, the electric quantity of the battery is lower, but the battery can still work normally), the battery can discharge to the electric equipment through the at least one first current limiting unit, and at the moment, the voltage parameter at the discharging port of the battery is equal to the difference between the voltage parameter of the electric core unit and the voltage parameter of the at least one first current limiting unit, so that the power of the electric equipment is limited. When the power of the electric equipment is limited, the user can obviously perceive the limitation, for example, when the electric equipment is a vehicle, the user can perceive the reduction of the driving speed; when the electric equipment is an air conditioner, the refrigerating/heating efficiency is obviously insufficient, so that a user can be reminded of charging the battery. Optionally, in another example, a low-voltage reminding unit, such as an LED lamp, a buzzer lamp, or other alarm unit, may be disposed in the battery. Under the condition that the battery control enables at least one first current limiting unit, the low-voltage reminding unit can be triggered to work so as to remind a user of charging the battery.

Optionally, in this embodiment, the battery may include a loop switch unit, and the initial state of the loop switch unit is an operating state. In the discharging process of the battery, after the at least one first current limiting unit is controlled to be enabled in response to the judgment result that the state parameter is smaller than or equal to the first discharging state parameter threshold value, the loop switch unit is disconnected after a preset time interval, so that the battery is switched from a discharging state through the loop switch unit to a discharging state through the at least one first current limiting unit. Or after the at least one first current limiting unit is enabled, the working state of the loop switch unit is controlled to be unchanged, so that the battery is discharged through the at least one first current limiting unit and the loop switch unit.

In one example, since the battery-connected electric device may perform a high-power operation under the condition that the discharge parameter of the battery is large, if the loop switch unit is directly turned off, the electric device is easily damaged. Therefore, the battery can disconnect the loop switch unit after the control enables the at least one first current limiting unit, preferably under the condition that the discharge parameter of the battery is small.

Step S304, continuously acquiring the state parameters of the cell unit.

Step S306, in response to the determination result that the state parameter is less than or equal to the second discharging state parameter threshold, controlling to enable the at least one second current limiting unit.

Optionally, in this embodiment, the second discharge state parameter threshold may be smaller than the first discharge state parameter threshold. The first discharge state parameter threshold and the second discharge state parameter threshold may be determined according to an SOC parameter of the battery during a discharge process, and in one example, the first discharge state parameter threshold may be any one of 15%, 12%, 10%, or 8% of the SOC of the cell unit, and the second discharge state parameter threshold may be any one of 8%, 5%, 3%, or 1% of the SOC of the cell unit. Optionally, the first discharge state parameter threshold and the second discharge state parameter threshold may also be determined according to a voltage parameter corresponding to an SOC parameter of the battery during discharge, and in one example, the first discharge state parameter threshold may be determined according to a voltage parameter corresponding to the cell unit when the SOC parameter is 15%. The second discharge state parameter threshold may be determined according to a corresponding voltage parameter of the cell unit when the SOC parameter is 10%.

Optionally, in this embodiment, after the battery controls enabling of the at least one first current limiting unit, the battery may continue to acquire the state parameters of the battery cell unit. And in response to the judgment result that the state parameter is less than or equal to the second discharge state parameter threshold value, controlling to enable the at least one second current limiting unit, and disconnecting the at least one first current limiting unit so as to discharge the battery through the at least one second current limiting unit. And at the moment, the voltage parameter at the discharge port of the battery is equal to the difference between the voltage parameter of the electric core unit and the voltage parameter of the at least one second current-limiting unit, so that the voltage parameter at the discharge port is smaller than or equal to the protection threshold value of the electric equipment, the electric equipment is triggered to stop supplying power to the battery, the power consumption power of the electric equipment is limited or the electric equipment is limited to stop working, the discharge operation of the battery is finished, and the discharge parameter of the battery is zero. The protection threshold of the electric device may be determined according to a rated voltage of the electric device.

Optionally, in this embodiment, after the battery control enables the at least one second current limiting unit, the operating state of the at least one first current limiting unit may also be controlled to remain unchanged, so that the battery is discharged through the at least one first current limiting unit and the at least one second current limiting unit at the same time.

In one example, when the state parameter of the battery cell unit is smaller than the second discharge state parameter threshold, the battery enters an under-voltage current-limiting stage, that is, the battery capacity is too low to be suitable for a stage of continuing discharge operation, and if the battery continues to discharge at this time, there is an over-discharge risk easily to cause damage to the battery.

In one example, the battery may be disposed with more than two interconnected current limiting units, and the current limiting unit with the largest current limiting resistance value is used to directly disable the electric device, so as to adjust the discharge parameter of the battery to zero. The current limiting resistance values of the other current limiting units are increased in sequence. When the voltage parameter of the electric core unit is smaller than the second discharge state parameter threshold value, the current limiting unit with the larger resistance value of the current limiting resistor is enabled step by step within a short preset time, so that a user can obviously perceive that the output power of the battery is insufficient within a short time, and the battery can still work, the discharge parameter of the battery is not zero, and sudden power failure is avoided. After the current limiting unit at the upper stage of the current limiting unit with the largest current limiting resistance value is enabled, low-voltage reminding operation can be performed, for example, an LED lamp flickers, or a buzzer is controlled to output different reminding signals, the current limiting unit with the largest current limiting resistance value is enabled after a preset time is delayed, so that the discharging parameter of the battery is zero, and discharging of the electric equipment is stopped.

In another example, the number of the current limiting units is not limited to two, and may include three, four, or more, and each current limiting unit corresponds to a different discharge parameter threshold, so that the discharge parameter may be gradually decreased until the electrical device is triggered to stop operating.

In this embodiment, by setting a first discharge state parameter threshold and a second discharge state parameter threshold, a state parameter is first compared with the first discharge state parameter threshold, the at least one first current limiting unit is enabled based on the comparison result, so that the discharge parameter of the battery is adjusted by using the at least one first current limiting unit, and then the state parameter of the battery cell unit is continuously obtained.

Optionally, in an embodiment, the control method further includes: the discharge current of the battery is periodically detected. Step S302, controlling to enable at least one first current limiting unit in response to the determination result that the state parameter is less than or equal to the first discharging state parameter threshold, includes: and/or, in response to a determination result that the state parameter is less than or equal to the first discharge state parameter threshold and the discharge current is greater than the discharge current threshold, controlling to enable the at least one first current limiting unit after delaying for a first preset duration or a first preset period, and/or controlling to enable the at least one first current limiting unit in response to a determination result that the state parameter is less than or equal to the first discharge state parameter threshold and the discharge current is less than the discharge current threshold.

Specifically, in this embodiment, if the battery is in a large current discharge state, it indicates that the electric device is in a high power operating state, and at this time, if the discharge parameter of the battery is suddenly reduced, the electric device may be affected. Therefore, in the case where the battery is in a discharged state, the discharge current of the battery can be periodically detected. And comparing the discharging current with the discharging current threshold, and in response to the judgment result that the state parameter is less than or equal to the first discharging state parameter threshold and the discharging current is greater than the discharging current threshold, delaying for a first preset time or a first preset period, controlling to enable the at least one first current limiting unit, and disconnecting the loop switch unit so that the battery is discharged through the at least one first current limiting unit. The battery can also respond to the judgment result that the state parameter is less than or equal to the first discharging state parameter threshold value and the discharging current is less than or equal to the discharging current threshold value, directly control to enable the at least one first current limiting unit, and disconnect the loop switch unit, so that the battery is discharged through the at least one first current limiting unit.

In one example, the discharge current of the battery may be periodically detected. When the state parameter is determined to be less than or equal to the first discharge state parameter threshold and the discharge current in the first period is determined to be greater than the discharge current threshold, at least one first current limiting unit is not controlled to be enabled immediately, but is controlled to be enabled after a first preset number of periods (for example, four periods) or a first preset time (for example, 5 min) is delayed. As an alternative embodiment, in the case that it is determined that the state parameter is less than or equal to the first discharge state parameter threshold and the discharge current is greater than the discharge current threshold in the first period, the at least one first current limiting unit is not immediately enabled, but the discharge current of the battery continues to be periodically detected until the discharge current is less than the discharge current threshold, and the at least one first current limiting unit is enabled.

In this embodiment, by delaying the first preset time period or the first preset period in response to the determination result that the state parameter is less than or equal to the first discharging state parameter threshold and the discharging current is greater than the discharging current threshold, the enabling of the at least one first current limiting unit is controlled, and the loop switch unit is turned off, so that the problem of abnormal operation of the electric equipment caused by immediately reducing the discharging current of the battery when the electric equipment has a high power can be avoided, and the safety of the control method of the battery can be improved.

In one embodiment, in step S302, in response to a determination result that the state parameter is less than or equal to the first discharging state parameter threshold, the method for controlling to enable the at least one first current limiting unit and disconnecting the loop switch unit includes: when the discharging current after enabling the at least one first current limiting unit is detected to be larger than the discharging current before enabling the at least one first current limiting unit, the at least one first current limiting unit is controlled to be forbidden, and after delaying a second preset duration or a second preset period, the at least one first current limiting unit is controlled to be enabled.

Specifically, the battery may periodically obtain a discharge current of the battery, and when it is detected that the discharge current after enabling the at least one first current limiting unit is greater than the discharge current before enabling the at least one first current limiting unit, it indicates that the electric device may be performing a high-power operation, and at this time, the discharge current of the electric device needs to be increased, for example, the at least one first current limiting unit is controlled to be disabled, so that the battery may be discharged through the loop switch unit and the at least one first current limiting unit, a discharge parameter of the battery is increased, and a power of the electric device is increased. However, the battery is not suitable for long-time large-current discharge because the battery is already in the under-voltage reminding stage currently. Therefore, after delaying the second preset duration or the second preset period, the control enables the at least one first current limiting unit, so that the battery can be discharged through the at least one first current limiting unit, and the discharge current of the battery is reduced.

In one example, when the battery is in the low-voltage reminding stage (the state parameter is less than or equal to the discharge state parameter threshold), the user perceives that the battery is low after the power of the electric device is reduced, but at this time, the user may still accelerate the operation of the electric device to increase the power of the electric device. For example, in the case where the electric device is a new energy vehicle, the user may accelerate to find the charging pile. When the electric equipment is a microwave oven or an electromagnetic oven in a caravan, the user may increase the food heating power. At this time, after the control enables the at least one first current limiting unit, the output current of the battery may become significantly large, and at this time, the battery needs to be able to meet the high-power demand of the user. Therefore, after the at least one first current limiting unit is enabled, the at least one first current limiting unit can be controlled to be disabled under the condition that the discharge current of the battery is detected to be increased, so as to recover the discharge parameter of the battery, and the loop switch unit is turned off after the second preset duration or the second preset period is delayed.

In this embodiment, when it is detected that the discharge current after enabling the at least one first current limiting unit is greater than the discharge current before enabling the at least one first current limiting unit, the at least one first current limiting unit is controlled to be disabled, and after delaying the second preset duration or the second preset period, the at least one first current limiting unit is controlled to be enabled, so that the high-power consumption requirement of the power consumption equipment in the short time of the under-voltage reminding stage can be met, and the power consumption experience of a user is improved.

Optionally, in an embodiment, the control method further includes: and adjusting the first discharge state parameter threshold value and/or the second discharge state parameter threshold value according to the actual capacity parameter or the health degree parameter of the battery.

In this embodiment, the actual capacity parameter of the battery, which may be used to characterize the charge capacity capability of the cell unit in the current battery, generally decreases with the increase of the service life of the battery, for example, the rated capacity parameter of the battery is 1Ah, but when the internal resistance of the battery becomes large after 1 year of service, the actual capacity parameter may decrease to 0.92Ah. The state of health parameter of the battery is used for representing the state of health of the battery, and generally represents the state of the battery from the beginning to the end of the life in percentage, which is a quantitative description of the current performance state of the battery. In one example, the health parameter may be generated based on a current capacity of the battery and a rated capacity of the battery. In another example, the health parameter may also be generated according to the current maximum discharge capacity of the battery and the new maximum discharge capacity of the battery. In another example, the health parameter may also be generated from the internal resistance at the end of the battery life, the internal resistance of the current battery, and the internal resistance of the new battery.

Specifically, the charge capacity of the cell unit may be reduced due to battery aging. The first discharge state parameter threshold and/or the second discharge state parameter threshold at this time do not match the actual capacity parameter of the current battery. Therefore, the first discharge state parameter threshold and/or the second discharge state parameter threshold need to be appropriately adjusted according to the actual capacity parameter or the health parameter of the battery. For example, the first discharge state parameter threshold and/or the second discharge state parameter threshold are increased accordingly. In one example, the adjustment range of the first and/or second discharge state parameter threshold may be determined according to an aged OCV-SOC curve (a curve generated according to a discharge voltage and a charge capacity of the battery) built in a battery management system in the battery.

In this embodiment, the first discharge state parameter threshold and/or the second discharge state parameter threshold are/is adjusted according to the state parameter of the battery, so that the setting of the discharge state parameter threshold can be more suitable for the current battery discharge application scenario, and the universality and the adaptability of the battery control method are improved.

Alternatively, in one possible embodiment, as shown in fig. 4, there is provided a control method of a battery, including:

step S402, periodically detecting the current of the cell unit, and determining that the battery is in a charging state.

Step S404, in response to the determination result that the state parameter is greater than or equal to the first charging state parameter threshold, controlling to turn on at least one first current limiting unit and turn off the loop switch unit.

Step S406, determining whether the battery is in a charging state, and continuing to acquire the state parameters of the electric core unit in response to the determination result that the battery is in the charging state.

Step S408, in response to the determination result that the state parameter is greater than or equal to the second charging state parameter threshold, controlling to turn on the at least one second current limiting unit and turn off the at least one first current limiting unit.

Step S410, obtaining a time period from the time when the at least one first current limiting unit is turned on to the time when the at least one second current limiting unit is turned on, and adjusting the first charging state parameter threshold and/or the second charging state parameter threshold in response to a determination result that the time period is greater than or equal to a preset time period threshold.

In this embodiment, when the state parameter of the electric core unit is greater than or equal to the first charging state parameter threshold, the at least one first current limiting unit is controlled to be turned on, and the loop switch unit is turned off, so that the charging parameter of the battery can be adjusted by using the at least one first current limiting unit, and the charging parameter of the battery is reduced, thereby preventing the battery from being overcharged; after the at least one first current limiting unit is conducted, the state parameters of the battery cell unit are continuously acquired in response to the judgment result that the battery is in the charging state, the at least one second current limiting unit is controlled to be conducted in response to the judgment result that the state parameters are larger than or equal to the second charging state parameter threshold value, the at least one first current limiting unit is disconnected, the charging parameters of the battery can be further reduced, the charging parameters of the battery are enabled to be zero, and the charging process of the battery is ended; the first charging state parameter threshold and/or the second charging state parameter threshold can be adjusted under the condition that the time length from the conduction of at least one first current limiting unit to the conduction of at least one second current limiting unit is greater than a preset time length threshold, so that the first charging state parameter threshold and/or the second charging state parameter threshold are/is more suitable for the current battery charging application scene, and the flexibility and the universality of the battery control method are improved.

In another embodiment, as shown in fig. 5, there is provided a control method of a battery including:

step S502, periodically detecting the current of the battery cell unit, and determining that the battery is in a discharge state.

Step S504, in response to the determination result that the state parameter is less than or equal to the first discharging state parameter threshold and the discharging current is greater than the discharging current threshold, after delaying the first preset duration or the first preset period, controlling to turn on at least one first current limiting unit and turn off the loop switch unit.

In step S506, when it is detected that the discharging current after the loop switch unit is turned off is greater than the discharging current before the at least one first current limiting unit is turned on, the loop switch unit is turned on, and the loop switch unit is turned off after a second preset duration or a second preset period is delayed.

Step S508, continuously obtaining the state parameters of the battery cell unit, and controlling to turn on the at least one second current limiting unit and turn off the at least one first current limiting unit in response to a determination result that the state parameters are less than or equal to the second discharge state parameter threshold.

Step S510, adjusting the first discharge state parameter threshold and/or the second discharge state parameter threshold according to the state parameter of the battery.

In this embodiment, by delaying a first preset duration or a first preset period, controlling to turn on at least one first current limiting unit, turning off the loop switch unit, turning on the loop switch unit when it is detected that a discharge current after turning off the loop switch unit is greater than a discharge current before turning on at least one first current limiting unit, and turning off the loop switch unit after delaying a second preset duration or a second preset period, a fault problem caused by directly turning off the loop switch unit when the electric equipment performs a high-power operation can be avoided, so as to improve the safety of the battery control method; the battery can be prevented from being in an overdischarge state to protect the battery by controlling to switch on the at least one second current limiting unit and switch off the at least one first current limiting unit in response to the judgment result that the state parameter is less than or equal to the second discharge state parameter threshold value; the first discharge state parameter threshold value and/or the second discharge state parameter threshold value are/is adjusted according to the state parameters of the battery, so that the first discharge state parameter threshold value and/or the second discharge state parameter threshold value can be more suitable for the current battery discharge scene, and the universality of the battery control method is improved.

It should be understood that, although the steps in the flowcharts related to the embodiments described above are shown in sequence as indicated by the arrows, the steps are not necessarily performed in sequence as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least some of the steps in the flowcharts according to the embodiments described above may include multiple steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, and the execution order of the steps or stages is not necessarily sequential, but may be rotated or alternated with other steps or at least some of the steps or stages in other steps.

Based on the same inventive concept, the embodiment of the present application further provides a battery for implementing the above-mentioned battery control method. The implementation scheme for solving the problem provided by the battery is similar to the implementation scheme recorded in the method, so specific limitations in one or more battery embodiments provided below can be referred to the limitations on the battery control method in the foregoing, and are not described again here.

In one embodiment, as shown in fig. 6, there is provided a battery 600 comprising: a battery cell unit 602, at least one current limiting unit 604 and a control unit 606, wherein:

the cell unit 602 includes at least one cell.

And at least one current limiting unit 604 connected to the cell unit 602.

The control unit 606 is configured to obtain a state parameter of the electric core unit 602, and control the working state of the at least one current limiting unit 604 in response to a determination result that the state parameter is greater than or equal to the charging state parameter threshold and/or the state parameter is less than or equal to the discharging state parameter threshold, so as to adjust the charging parameter and/or the discharging parameter of the battery 600.

Specifically, in this embodiment, the initial state of at least one current limiting unit 604 is a disabled state (non-operating state). The battery 600 detects the cell unit 602 through the control unit 606, and obtains the state parameters of the cell unit 602 in real time or periodically. Under the condition that the control unit 606 determines that the current battery is in the charging state, the state parameter of the electric core unit 602 is compared with a pre-stored threshold of the charging state parameter, and in response to a determination result that the state parameter is greater than or equal to the threshold of the charging state parameter, at least one current limiting unit 604 is controlled to operate, so as to perform current limiting processing on the battery 600, so as to reduce the charging parameter of the battery 600. Under the condition that the control unit 606 determines that the current battery is in a discharging state, the state parameter of the electric core unit 602 is compared with a pre-stored discharging state parameter threshold, and in response to a determination result that the state parameter is less than or equal to the discharging state parameter threshold, at least one current limiting unit 604 is controlled to operate, so as to perform current limiting processing on the battery 600, so as to reduce the discharging parameter of the battery 600.

In one example, in case that the number of the current limiting units is one, a pre-charge circuit as shown in fig. 7a may be disposed in the battery, including: a battery cell 1, a battery management system BMS protection board 2 (all switches and cells are connected to the BMS protection board), a relay 3, a fuse 4, a switch 7, a resistor 8, a charge circuit switch unit 9, a discharge circuit switch unit 10, a current sensor 11, a charge port positive electrode/discharge port positive electrode 12, a charge port negative electrode/discharge port negative electrode 13. In the present embodiment, the function of charge and discharge control can be realized by using a precharge circuit in the battery as the current limiting means, and the precharge circuit is composed of the switch 7 and the resistor 8. Generally speaking, the pre-charge circuit is used for buffering the current of the battery at the initial stage of charging and discharging, however, in this embodiment, the pre-charge circuit in the battery itself can be used, and the current limiting or controlling effect of the battery on charging and discharging at the later stage of charging and discharging (such as when overcharging or overdischarging is about to occur) can be achieved without additionally adding or changing a new hardware configuration. As an alternative embodiment, a current limiting unit may be additionally disposed in the battery to perform charge and discharge control.

In another example, in the case that there are two current limiting units, a circuit as shown in fig. 7b may be disposed in the battery, including: the battery management system comprises a battery cell 1, a battery management system BMS protection board 2 (all switches and the battery cell are connected on the BMS protection board), a relay 3, a fuse 4, a second current limiting unit switch 5, a second current limiting resistor 6, a first current limiting unit switch 7, a first current limiting resistor 8, a charging loop switch unit 9, a discharging loop switch unit 10, a current sensor 11, a charging port anode/discharging port anode 12 and a charging port cathode/discharging port cathode 13.

In one embodiment, the at least one current limiting unit 604 comprises: the first current limiting unit comprises at least one first current limiting resistor and at least one first current limiting switch; the second current limiting unit comprises at least one second current limiting resistor and at least one second current limiting switch, and the resistance value of the second current limiting resistor is larger than that of the first current limiting resistor.

In one embodiment, battery 600 further comprises: and the charging port is used for charging the battery by the charging equipment. A control unit 606, further configured to: controlling enabling of at least one first current limiting unit to adjust the charging parameters in response to a judgment result that the state parameters are greater than or equal to the first charging state parameter threshold; continuously acquiring state parameters of the battery cell unit; in response to a judgment result that the state parameter is greater than or equal to the second charging state parameter threshold value, controlling to enable at least one second current limiting unit so that the voltage parameter of the charging port is greater than or equal to the protection threshold value of the charging equipment, and triggering the charging equipment to stop charging the battery so that the charging parameter is zero; wherein the second state of charge parameter threshold is greater than the first state of charge parameter threshold.

In one embodiment, the control unit 606 is further configured to determine whether the battery is in a charging state; and adjusting the first charging state parameter threshold value and/or the second charging state parameter threshold value in response to the judgment result that the battery is not in the charging state.

In one embodiment, the control unit 606 is further configured to continue to acquire the state parameters of the cell unit in response to the determination result that the battery is in the charging state; after the at least one second current limiting unit is controlled to be enabled in response to the determination result that the state parameter is greater than or equal to the second charging state parameter threshold, the method further includes: obtaining a time period from enabling the at least one first current limiting unit to enabling the at least one second current limiting unit; and responding to a judgment result that the duration is greater than or equal to the preset duration threshold, and adjusting the first charging state parameter threshold and/or the second charging state parameter threshold.

In one embodiment, battery 600 further comprises: and the discharge port is used for supplying power to the electric equipment by the battery. A control unit 606, further configured to: responding to the judgment result that the state parameter is less than or equal to the first discharge state parameter threshold value, and controlling to enable at least one first current limiting unit so as to adjust the discharge parameter; continuously acquiring state parameters of the battery cell unit; responding to a judgment result that the state parameter is smaller than or equal to a second discharging state parameter threshold value, controlling to enable at least one second current limiting unit so that the voltage parameter of the discharging port is smaller than or equal to a protection threshold value of the electric equipment, and triggering the electric equipment to stop the electricity consumption of the battery so as to enable the discharging parameter to be zero; and the second discharge state parameter threshold value is smaller than the first discharge state parameter threshold value.

In one embodiment, the control unit 606 is further configured to periodically detect a discharge current of the battery; responding to the judgment result that the state parameter is less than or equal to the first discharge state parameter threshold value, controlling to enable at least one first current limiting unit, and the method comprises the following steps: in response to the judgment result that the state parameter is smaller than or equal to the first discharging state parameter threshold value and the discharging current is larger than or equal to the discharging current threshold value, after delaying a first preset time or a first preset period, controlling to enable at least one first current limiting unit; and/or controlling to enable the at least one first current limiting unit in response to a judgment result that the state parameter is less than or equal to the first discharging state parameter threshold and the discharging current is less than the discharging current threshold.

In one embodiment, the control unit 606 is further configured to, after controlling enabling the at least one first current limiting unit, control disabling the at least one first current limiting unit when detecting that the discharge current after enabling the at least one first current limiting unit is greater than the discharge current before enabling the at least one first current limiting unit; and after delaying the second preset time length or the second preset period, controlling to enable the at least one first current limiting unit.

In one embodiment, the control unit 606 is further configured to adjust the first discharge state parameter threshold and/or the second discharge state parameter threshold according to an actual capacity parameter or a health parameter of the battery.

The foregoing embodiment provides a battery for executing the foregoing control method, and therefore, the specific control method procedures and technical effects are completely the same as those of the foregoing control method, and those skilled in the art can understand that the foregoing control method can be executed by the battery described in this embodiment, and therefore, all the contents of the foregoing control method are referred to in this embodiment and are not described herein again.

In one embodiment, a battery management system is further provided, which includes a memory and a processor, where the memory stores a computer program, and the processor implements the steps in the above method embodiments when executing the computer program.

In an embodiment, a computer-readable storage medium is also provided, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the above-mentioned method embodiments.

In an embodiment, a computer program product is provided, comprising a computer program which, when being executed by a processor, carries out the steps of the above-mentioned method embodiments.

The arrangement sequence of the embodiments of the present application is merely for description, and does not represent the advantages and disadvantages of the embodiments.

In the present application, the same or similar term concepts, technical solutions and/or application scenario descriptions will be generally described only in detail at the first occurrence, and when the description is repeated later, the detailed description will not be repeated in general for brevity, and when understanding the technical solutions and the like of the present application, reference may be made to the related detailed description before the description for the same or similar term concepts, technical solutions and/or application scenario descriptions and the like which are not described in detail later.

In the present application, each embodiment is described with an emphasis on the description, and reference may be made to the description of other embodiments for parts that are not described or recited in any embodiment.

The technical features of the technical solution of the present application may be arbitrarily combined, and for brevity of description, all possible combinations of the technical features in the embodiments are not described, however, as long as there is no contradiction between the combinations of the technical features, the scope of the present application should be considered as being described in the present application.

Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present application or portions contributing to the prior art may be embodied in the form of a software product, where the computer software product is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) as above, and includes several instructions to enable a battery pack (which may be a battery cell, a battery pack, or a battery system, etc.) to execute the method of each embodiment of the present application.

The above description is only a preferred embodiment of the present application, and not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings of the present application, or which are directly or indirectly applied to other related technical fields, are included in the scope of the present application.

Claims

1. A control method of a battery, characterized by comprising:

acquiring state parameters of a cell unit in the battery;

responding to a judgment result that the state parameter is larger than or equal to a first charging state parameter threshold value and/or the state parameter is smaller than or equal to a first discharging state parameter threshold value, and controlling to enable at least one first current limiting unit in the battery so as to reduce the charging parameter and/or the discharging parameter of the battery;

continuously acquiring the state parameters of the battery cell units;

responding to a judgment result that the state parameter is larger than or equal to a second charging state parameter threshold value and/or the state parameter is smaller than or equal to a second discharging state parameter threshold value, and controlling to enable at least one second current limiting unit in the battery so that the charging parameter and/or the discharging parameter of the battery are/is zero;

wherein the second charging state parameter threshold is greater than the first charging state parameter threshold, and the second discharging state parameter threshold is less than the first discharging state parameter threshold.

2. The control method according to claim 1, wherein the enabling of at least one second current limiting unit in the battery in response to the determination that the state parameter is greater than or equal to a second state of charge parameter threshold value is controlled so that the charge parameter of the battery is zero comprises:

and in response to a judgment result that the state parameter is greater than or equal to a second charging state parameter threshold value, controlling to enable the at least one second current limiting unit so that a voltage parameter of a charging port in the battery is greater than or equal to a protection threshold value of charging equipment, and triggering the charging equipment to stop charging the battery so that the charging parameter of the battery is zero, wherein the charging port is used for the charging equipment to charge the battery.

3. The method according to claim 1, wherein after the controlling enabling the at least one first current limiting unit in response to the determination that the state parameter is greater than or equal to the first soc parameter threshold, further comprising:

judging whether the battery is in a charging state;

and decreasing the first charging state parameter threshold and/or the second charging state parameter threshold in response to a determination that the battery is not in a charging state.

4. The control method according to claim 3, characterized by further comprising:

acquiring the time length from enabling the at least one first current limiting unit to enabling the at least one second current limiting unit;

and responding to a judgment result that the duration is greater than or equal to a preset duration threshold, and increasing the first charging state parameter threshold or decreasing the second charging state parameter threshold.

5. The control method according to claim 1, wherein the enabling of at least one second current limiting unit in the battery in response to the determination result that the state parameter is less than or equal to a second discharging state parameter threshold value is controlled so that the discharging parameter of the battery is zero, comprises:

and in response to a judgment result that the state parameter is smaller than or equal to a second discharging state parameter threshold value, controlling to enable the at least one second current limiting unit so that a voltage parameter of a discharging port in the battery is smaller than or equal to a protection threshold value of electric equipment, and triggering the electric equipment to stop working so that the discharging parameter of the battery is zero, wherein the discharging port is used for the battery to provide power for the electric equipment.

6. The control method of claim 1, wherein the state parameter comprises a state of charge parameter or a voltage parameter;

the control method further comprises the following steps:

periodically detecting a discharge current of the battery;

the enabling of the at least one first current limiting unit is controlled in response to the judgment result that the state parameter is smaller than or equal to the first discharge state parameter threshold value, and the enabling of the at least one first current limiting unit comprises:

in response to a judgment result that the state of charge parameter or the voltage parameter is smaller than or equal to a first discharge state parameter threshold value and the discharge current is larger than or equal to a discharge current threshold value, after delaying a first preset duration or a first preset period, controlling to enable the at least one first current limiting unit; and/or the presence of a gas in the gas,

and controlling to enable the at least one first current limiting unit in response to a judgment result that the state of charge parameter or the voltage parameter is smaller than or equal to the first discharge state parameter threshold and the discharge current is smaller than the discharge current threshold.

7. The method as claimed in claim 6, wherein after the controlling enables the at least one first current limiting unit, the method further comprises:

8. The control method according to any one of claims 5 to 7, characterized by further comprising:

9. A battery, comprising:

the battery cell unit comprises at least one battery cell;

the at least one current limiting unit is connected with the battery cell unit and comprises at least one first current limiting unit and at least one second current limiting unit;

the control unit is configured to acquire a state parameter of the cell unit, control enabling the at least one first current limiting unit to reduce a charge parameter and/or a discharge parameter of the battery in response to a determination result that the state parameter is greater than or equal to a first charge state parameter threshold and/or the state parameter is less than or equal to a first discharge state parameter threshold, and continue to acquire the state parameter of the cell unit, and control enabling the at least one second current limiting unit in the battery in response to a determination result that the state parameter is greater than or equal to a second charge state parameter threshold and/or the state parameter is less than or equal to a second discharge state parameter threshold, so that the charge parameter and/or the discharge parameter of the battery are zero, where the second charge state parameter threshold is greater than the first charge state parameter threshold, and the second discharge state parameter threshold is less than the first discharge state parameter threshold.

10. The battery of claim 9, wherein the first current limiting unit comprises at least one first current limiting resistor and at least one first current limiting switch;

11. The battery of claim 10, further comprising:

a charging port for a charging device to charge the battery;

the control unit is further configured to:

and in response to a judgment result that the state parameter is greater than or equal to a second charging state parameter threshold value, controlling to enable the at least one second current limiting unit so that the voltage parameter of the charging port is greater than or equal to a protection threshold value of the charging equipment, and triggering the charging equipment to stop charging the battery so that the charging parameter of the battery is zero.

12. The battery of claim 10, further comprising:

a discharge port for the battery to provide power to a powered device;

the control unit is further configured to:

and controlling enabling the at least one second current limiting unit in response to a judgment result that the state parameter is smaller than or equal to a second discharging state parameter threshold value, so that the voltage parameter of the discharging port is smaller than or equal to a protection threshold value of the electric equipment, and triggering the electric equipment to stop working so as to enable the discharging parameter of the battery to be zero.

13. A battery management system comprising a storage module storing a computer program and a processing module, wherein the processing module implements the method of controlling a battery according to any one of claims 1 to 8 when executing the computer program.