Charge and discharge management methods and devices, vehicles, and storage media

Abstract

This application proposes a charge / discharge management method, apparatus, vehicle, and storage medium. The method first detects the current mode of the battery, and then determines the corresponding current based on the current mode, including the charging current for the charging mode, the discharging current for the discharging mode, and the recharge current for the recharge mode. Therefore, this application can predict the charge / discharge current based on the actual operating conditions of the battery, achieving adaptive adjustment of the charge / discharge current while ensuring no lithium plating or thermal runaway occurs. This facilitates charging and discharging with optimal current, balancing good charging / discharging performance with high safety.

Description

Technical Field

[0001] This application relates to the field of charge and discharge management technology for lithium-ion batteries, specifically to a charge and discharge management method and device, vehicle, and storage medium. Background Technology

[0002] The charging and discharging of a battery is essentially the electrical movement of lithium ions within the battery. During this process, there are not only limitations on lithium plating but also on thermal limitations. Thermal limitations refer to controlling the battery temperature within a safe range to prevent thermal runaway. Currently, the charging and discharging current of batteries is generally continuous, making it difficult to adaptively adjust the current according to actual operating conditions. This not only increases the risk of lithium plating and thermal runaway but also makes it difficult to achieve optimal charging and discharging performance. For example, fast charging has become mainstream. Fast charging requires high-rate charging in a short period. During the entire charging process, a continuously high current can easily lead to lithium plating and thermal runaway, affecting charging efficiency, increasing fast charging time, increasing safety risks, and significantly impacting battery lifespan. Summary of the Invention

[0003] In view of this, this application provides a charging and discharging management method, device, vehicle, and storage medium, which can improve the problems of the difficulty in adaptively adjusting the charging and discharging current of the battery according to the actual working conditions, as well as the resulting high risk of lithium plating and thermal runaway, and poor charging and discharging effect.

[0004] This application provides a charge / discharge management method, including:

[0005] Detect the current battery mode;

[0006] If the battery is currently in charging mode, the minimum value between the lithium plating limit continuous current and the thermal limit continuous current of the battery is selected as the charging current to control the charging of the battery.

[0007] If the battery is currently in discharge mode, a calculus calculation is performed based on the thermal limit continuous current, the current of the battery, and the running time to obtain the thermal limit cumulative value. Based on the thermal limit cumulative value, the thermal limit continuous current, and the thermal limit peak current, peak temperature, and continuous temperature of the battery, one of the thermal limit continuous current and the thermal limit peak current is determined as the discharge current to control the battery discharge.

[0008] If the battery is currently in recharge mode, then a cumulative thermal limit value is obtained by performing calculus calculations based on the thermal limit continuous current, the current of the battery, and the operating time. A cumulative lithium plating limit value is also obtained by performing calculus calculations based on the lithium plating limit continuous current, the current of the battery, and the operating time. Then, based on the cumulative thermal limit value, the thermal limit continuous current, and the battery's thermal limit peak current, peak temperature, and continuous temperature, one of the thermal limit continuous current and the thermal limit peak current is determined as the first peak current. Finally, based on the cumulative lithium plating limit value, the lithium plating limit continuous current, the battery's lithium plating limit peak current, the peak temperature, and the continuous temperature, one of the lithium plating limit continuous current and the lithium plating limit peak current is determined as the second peak current. The smaller of the first peak current and the second peak current is selected as the recharge current to control the battery to recharge.

[0009] Optionally, the method further includes:

[0010] Obtain the current temperature and state of charge of the battery;

[0011] The lithium plating limit current, thermal limit current, lithium plating limit peak current, and thermal limit peak current corresponding to the current temperature and state of charge of the battery are obtained by looking up the table.

[0012] Optionally, the cumulative value of the thermal limit is obtained by performing calculus calculations based on the thermal limit continuous current, the current of the battery, and the operating time, including:

[0013] Using the relation C1=∫(I0) 2 -I 11 2 The cumulative thermal limit value is calculated using dt, where C1 is the cumulative thermal limit value, I0 is the current of the battery, and I... 11 Let t be the thermal limit continuous current, and t be the operating time.

[0014] Optionally, when the battery is currently in recharge mode, a cumulative value of the lithium plating limit is obtained by performing calculus calculations based on the lithium plating limit continuous current, the current of the battery, and the operating time, including:

[0015] Using the relation C2=∫(I0-I 21 The cumulative lithium plating limit is calculated using dt, where C2 is the cumulative lithium plating limit, I0 is the current of the battery, and I... 21 The lithium plating limit current is denoted as .

[0016] Optionally, determining one of the thermal limit continuous current and the thermal limit peak current as the discharge current or the first peak current based on the thermal limit cumulative value, the thermal limit continuous current, and the thermal limit peak current, peak temperature, and continuous temperature of the battery includes:

[0017] If the cumulative thermal limit value, the peak thermal limit current, the continuous thermal limit current, and the peak temperature satisfy Equation 1: C1≤(I 12 2 -I 11 2 )*T1,I 12 Given the thermal limit peak current and T1 as the peak temperature, the thermal limit peak current is determined as either the discharge current or the first peak current.

[0018] If the cumulative thermal limit value, the peak thermal limit current, the continuous thermal limit current, the peak temperature, and the continuous temperature satisfy Equation 2: C1≥(I 12 2 -I 11 2 )*(T2+T1 / 2), where T2 is the continuous temperature, then the thermal limit continuous current is determined as the discharge current or the first peak current;

[0019] If the cumulative thermal limit value, the peak thermal limit current, the continuous thermal limit current, the peak temperature, and the continuous temperature satisfy a relationship other than that of Equation 1 and Equation 2, then the discharge current or the first peak current is determined according to the following Equation 3:

[0020] I3 = I 11 -1 / ((T2-T1)*(I 11 +I 12 ))*(C1-(I 12 2 -I 11 2 )*T1)

[0021] I3 is the discharge current or the first peak current.

[0022] Optionally, determining one of the lithium plating limit continuous current and the lithium plating limit peak current as the second peak current based on the cumulative lithium plating limit value, the lithium plating limit sustained current, the lithium plating limit peak current of the battery, the peak temperature, and the sustained temperature includes:

[0023] If the cumulative value of the lithium plating limit, the peak current of the lithium plating limit, the continuous current of the lithium plating limit, and the peak temperature satisfy Equation 4: C2≤(I22 -I 21 )*T1,I 22 Given the lithium plating limit peak current and T1 as the peak temperature, the lithium plating limit peak current is determined as the second peak current.

[0024] If the cumulative value of the lithium plating limit, the peak current of the lithium plating limit, the continuous current of the lithium plating limit, the peak temperature, and the continuous temperature satisfy Equation 5: C2≥(I 22 -I 21 )*(T2+T1 / 2), where T2 is the sustained temperature, then the lithium plating limit sustained current is determined as the second peak current;

[0025] If the cumulative lithium plating limit, the continuous lithium plating limit current, the peak lithium plating limit current of the battery, the peak temperature, and the continuous temperature satisfy a relationship other than that of Equation 4 and Equation 5, then the second peak current is determined according to the following Equation 6:

[0026] I4 = I 22 -1 / (T2-T1)*(C2-(I 22 -I 21 )*T1)

[0027] I4 is the second peak current.

[0028] Optionally, the battery is currently in a discharge mode, including when the vehicle to which the battery is mounted is in a driving mode.

[0029] This application provides a charge / discharge management device, including a processor connected to a battery to perform the charge / discharge management method as described in any of the preceding claims.

[0030] This application provides a storage medium storing a computer program, which, when executed by a processor, implements the charge / discharge management method as described in any of the preceding claims.

[0031] This application provides a vehicle that includes the aforementioned charge / discharge management device or the aforementioned storage medium.

[0032] As described above, this application first detects the current mode of the battery, and then determines the corresponding current based on the current mode of the battery, including the charging current corresponding to the charging mode, the discharging current corresponding to the discharging mode, and the recharge current corresponding to the recharge mode. This allows for the estimation of the charging and discharging current based on the actual operating conditions of the battery. Under the premise of ensuring that lithium plating and thermal runaway do not occur, the charging and discharging current can be adaptively adjusted, which is conducive to charging and discharging with the optimal current, while taking into account both good charging and discharging effect and high safety. Attached Figure Description

[0033] Figure 1 This is a flowchart illustrating a charge / discharge management method provided in an embodiment of this application. Detailed Implementation

[0034] To address the aforementioned problems in the prior art, this application provides a charge / discharge management method and apparatus, a vehicle, and a storage medium. These protection subjects are based on the same concept, and the principles for solving the problems are basically the same or similar. The implementation methods of each protection subject can be referred to mutually, and repeated details will not be elaborated.

[0035] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly described below in conjunction with specific embodiments and corresponding drawings. Obviously, the embodiments described below are only a part of the embodiments of this application, and not all of them. Unless otherwise specified, the following embodiments and their technical features can be combined with each other, and also belong to the technical solutions of this application.

[0036] In the description of the embodiments of this application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the technical solutions of the corresponding embodiments, and are not intended to indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limitations on this application.

[0037] Please see Figure 1 As shown in the embodiment of this application, a charge and discharge management method is provided, which can be used to control the charge and discharge current of a battery, including the following steps S1 to S43.

[0038] S1: Detects the current mode of the battery.

[0039] The current mode of a battery can be determined based on the mode of operation of the electrical equipment it powers. Taking a battery installed in a vehicle (such as a new energy vehicle) as an example, the current mode of the battery includes any one of the following: charging mode, discharging mode, and recharge mode. When the vehicle is charging, the battery is in charging mode; when the vehicle is in driving mode, the battery discharges to provide the electrical energy required for driving, then the battery is in discharging mode; when the vehicle recovers kinetic energy through actions such as coasting or braking to charge the battery, the battery is in recharge mode, and at this time the vehicle is not stationary and is still in driving mode.

[0040] S2: If the battery is currently in charging mode, the minimum value between the lithium plating limit continuous current and the thermal limit continuous current of the battery is selected as the charging current to control battery charging.

[0041] The lithium plating limit current can be understood as the maximum current at which the battery will not plating lithium during a complete charge-discharge event, where the battery current remains constant throughout the event. In other words, increasing this value will cause lithium plating to occur during or after the charge-discharge process.

[0042] The thermal limit current can be understood as the maximum current at which a battery will not experience thermal runaway during a complete charge-discharge event, where the battery current remains constant throughout the event. In other words, if this value is increased, the battery will experience thermal runaway during the charge-discharge process.

[0043] In one example, this application first obtains the current temperature and state of charge (SOC) of the battery, and then looks up the corresponding lithium plating limit current and thermal limit current in a table. Optionally, the application further looks up the corresponding lithium plating limit peak current, thermal limit peak current, peak temperature, and sustained temperature in a table. This application can pre-determine the correspondence between different values ​​of temperature, SOC, and the lithium plating limit current, thermal limit current, lithium plating limit peak current, thermal limit peak current, peak temperature, and sustained temperature through multiple tests to form the table.

[0044] Step S2 selects the smaller value between the lithium plating limit current and the thermal limit current as the charging current. This is equivalent to using the bucket volume effect, which can avoid both lithium plating and thermal runaway.

[0045] S31: If the battery is currently in discharge mode, perform calculus calculations based on the thermal limit continuous current, the current of the battery, and the running time to obtain the cumulative value of the thermal limit.

[0046] And S32: Based on the cumulative thermal limit value, the continuous thermal limit current, and the battery's peak thermal limit current, peak temperature, and continuous temperature, determine one of the continuous thermal limit current and the peak thermal limit current as the discharge current to control battery discharge.

[0047] The thermal limit peak current can be understood as: the maximum current at which the battery does not experience thermal runaway at a certain moment or during a certain period of a charge-discharge event.

[0048] Peak temperature is the highest temperature of the battery during a single charge-discharge event.

[0049] The sustained temperature is the average temperature of the battery during a single charge-discharge event.

[0050] During the discharge process, the battery does not produce lithium plating. Lithium plating mainly occurs during the charging process. Therefore, this application only needs to prevent thermal runaway when the battery is in discharge mode.

[0051] In one example, the calculus function ∫I can be used. 2 The cumulative value of the thermal limit is calculated using dt, i.e., using the relation C1=∫(I0) 2 -I 11 2 The cumulative thermal limit is calculated using dt. Where C1 is the cumulative thermal limit, I0 is the current of the battery, and I... 11 t is the thermal limit current, and t is the operating time.

[0052] If the cumulative thermal limit value, peak thermal limit current, continuous thermal limit current, and peak temperature satisfy Equation 1: C1≤(I 12 2 -I 11 2 If I*T1, then the thermal limiting peak current is determined as the discharge current; where, I 12 T1 is the peak thermal limit current and T2 is the peak temperature.

[0053] If the cumulative thermal limit value, peak thermal limit current, continuous thermal limit current, peak temperature, and continuous temperature satisfy Equation 2: C1≥(I 12 2 -I 11 2 If T2 is calculated as T1 / 2, then the thermal limit continuous current is determined as the discharge current; where T2 is the continuous temperature.

[0054] If the cumulative thermal limit value, peak thermal limit current, continuous thermal limit current, peak temperature, and continuous temperature satisfy a relationship other than those described in Equations 1 and 2, then the discharge current is determined according to the following Equation 3: I3 = I 11 -1 / ((T2-T1)*(I 11 +I 12 ))*(C1-(I 12 2 -I 11 2 )*T1)

[0055] Where I3 is the discharge current.

[0056] S41: If the battery is currently in recharge mode, then the cumulative value of the thermal limit is obtained by performing calculus calculation based on the thermal limit continuous current, the current of the battery and the running time, and the cumulative value of the lithium plating limit is obtained by performing calculus calculation based on the lithium plating limit continuous current, the current of the battery and the running time.

[0057] And, S42: Based on the thermal limit cumulative value, thermal limit continuous current, and the thermal limit peak current, peak temperature, and continuous temperature of the battery, determine one of the thermal limit continuous current and the thermal limit peak current as the first peak current; and based on the lithium plating limit cumulative value, lithium plating limit continuous current, the lithium plating limit peak current, peak temperature, and continuous temperature of the battery, determine one of the lithium plating limit continuous current and the lithium plating limit peak current as the second peak current.

[0058] S43: Select the smaller of the first peak current and the second peak current as the recharge current to control the battery to recharge.

[0059] When the battery is currently in recharge mode, this application can use the aforementioned relationship C1=∫(I0) 2 -I 11 2 The cumulative value of the thermal limit is obtained by calculating dt, using the relation C2=∫(I0-I 21 The cumulative lithium plating limit is calculated using dt, where C2 is the cumulative lithium plating limit, I0 is the current of the battery, and I... 21 This is the lithium plating limit current.

[0060] In one example, the first peak current is calculated as follows:

[0061] If the cumulative thermal limit value, peak thermal limit current, continuous thermal limit current, and peak temperature satisfy the aforementioned relationship 1: C1≤(I 12 2 -I 11 2 If C1 is calculated as T1, then the thermal limit peak current is determined as the first peak current; where C1 is the cumulative thermal limit value, and I... 12 I is the thermally limiting peak current. 11 T1 is the thermal limit current, and T1 is the peak temperature.

[0062] If the cumulative thermal limit value, peak thermal limit current, continuous thermal limit current, peak temperature, and continuous temperature satisfy the aforementioned relationship 2: C1≥(I 12 2 -I 11 2 If T2 is the continuous temperature, then the thermal limit current is determined as the first peak current.

[0063] If the cumulative thermal limit value, peak thermal limit current, continuous thermal limit current, peak temperature, and continuous temperature satisfy a relationship other than those described in Equations 1 and 2, then the first peak current is determined according to the following Equation 3: I3 = I 11 -1 / ((T2-T1)*(I 11 +I12 ))*(C1-(I 12 2 -I 11 2 )*T1).

[0064] Where I3 is the first peak current.

[0065] In one example, the second peak current is calculated as follows:

[0066] If the cumulative value of the lithium plating limit, the peak current of the lithium plating limit, the continuous current of the lithium plating limit, and the peak temperature satisfy Equation 4: C2≤(I 22 -I 21 If C2 is the cumulative value of the lithium plating limit, then the lithium plating limit peak current is determined as the second peak current; where C2 is the cumulative value of the lithium plating limit, and I... 22 I is the lithium plating limiting peak current. 21 T1 is the lithium plating limit current, and T1 is the peak temperature.

[0067] If the cumulative value of the lithium plating limit, the peak current of the lithium plating limit, the continuous current of the lithium plating limit, the peak temperature, and the continuous temperature satisfy Equation 5: C2≥(I 22 -I 21 )*(T2+T1 / 2), then the lithium plating limit continuous current is determined as the second peak current; where T2 is the continuous temperature.

[0068] If the cumulative lithium plating limit, the sustained lithium plating limit current, the peak lithium plating limit current, the peak temperature, and the sustained temperature of the battery satisfy relationships other than those described in Equations 4 and 5, then the second peak current is determined according to the following Equation 6: I4 = I 22 -1 / (T2-T1)*(C2-(I 22 -I 21 )*T1)

[0069] Among them, I4 is the second peak current.

[0070] As described above, this application first detects the current mode of the battery, and then determines the corresponding current based on the current mode. This allows for the estimation of the charge and discharge current based on the actual operating conditions of the battery. Under the premise of ensuring no lithium plating or thermal runaway occurs, it achieves adaptive adjustment of the charge and discharge current, thus facilitating optimal charging and discharging while maintaining good charging and discharging performance and high safety. Furthermore, this application can monitor real-time data and perform timely current control operations, resulting in more reliable control.

[0071] When the battery is currently in charging or recharge mode, this application can also calculate the cumulative upper limit of the thermal limit and the cumulative upper limit of the lithium plating limit based on the lithium plating limit continuous current, the thermal limit continuous current, the lithium plating limit peak current, the thermal limit peak current, the peak temperature, and the continuous temperature. In one example, this application uses the following equation seven to calculate the cumulative upper limit of the thermal limit and the following equation eight to calculate the cumulative upper limit of the lithium plating limit:

[0072] C3=(I 12 2 -I 11 2 )*T1+1 / 2*(I 12 2 -I 11 2 Relationship 7: )*(T2-T1)

[0073] C4 = I 22 *T1+(I 22 -I 21 Relationship 8: )*(T2-T1)

[0074] Wherein, C3 is the cumulative upper limit of the thermal limit, and C4 is the cumulative upper limit of the lithium plating limit.

[0075] When the cumulative thermal limit value has not reached the upper limit of the thermal limit, current control is performed using the aforementioned steps S1 to S43; when the cumulative thermal limit value reaches or exceeds the upper limit of the thermal limit, this application can stop charging. Similarly, when the cumulative lithium plating limit value has not reached the upper limit of the lithium plating limit, current control is performed using the aforementioned steps S1 to S43; when the cumulative lithium plating limit value reaches or exceeds the upper limit of the lithium plating limit, this application can stop charging.

[0076] This application also provides a charge / discharge management device, including a processor connected to a battery to execute the charge / discharge management method as described in any of the above embodiments.

[0077] In one example, the charge / discharge management device can be implemented as a circuit board, with the processor being an MCU (Microcontroller Unit) integrated on the circuit board; alternatively, the charge / discharge management device can be implemented as the vehicle's main unit (or the main unit's motherboard), with the processor being the vehicle's main unit's control chip. The circuit board can integrate a BMS (Battery Management System), which not only implements the corresponding steps of the aforementioned charge / discharge management method but also provides overcurrent protection, overvoltage protection, charging protection, battery level detection, output short-circuit protection, and temperature detection to ensure safety. The circuit board can be a printed circuit board (PCB), a flexible printed circuit board (FPC), or a combination of both.

[0078] This application also provides a storage medium storing a computer program, which, when executed by a processor, implements the charge / discharge management method described in any of the previous embodiments.

[0079] This application also provides a vehicle, including the aforementioned charge / discharge management device or storage medium.

[0080] The embodiments of the charge / discharge management device, vehicle, and storage medium provided in this application may include all the technical features of any of the above-described charge / discharge management method embodiments, and therefore have corresponding beneficial effects. The extended and explanatory content of the specification is basically the same as the various embodiments of the above methods, and will not be repeated here.

[0081] Based on this understanding, the technical solution of this application, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes several instructions to cause a device (which may be a vehicle, mobile phone, computer, server, controlled terminal, or network device, etc.) to execute the methods of each embodiment of this application. When implemented using software, it can be implemented entirely or partially in the form of a computer program product. A computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the flow or function according to the embodiments of this application is generated.

[0082] It should be understood that the charge / discharge management device, vehicle, and storage medium provided in the embodiments of this application are complete devices and have the structures of known devices. Here, only the components involved in charge / discharge management are described, and other components are not described in detail.

[0083] The above description is only a part of the embodiments of this application and does not limit the patent scope of this application. For those skilled in the art, any equivalent structural transformations made using the content of this specification and drawings are similarly included within the patent protection scope of this application.

[0084] Although this document uses terms such as "first," "second," etc., to describe various types of information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. Furthermore, the singular forms "a," "an," and "the" are intended to also include the plural forms. The terms "or" and "and / or" are interpreted as inclusive, or meaning either one or any combination thereof. Exceptions to this definition only arise when combinations of elements, functions, steps, or operations are inherently mutually exclusive in some way.

Claims

1. A charging and discharging management method, characterized in that, include: Detect the current battery mode; If the battery is currently in charging mode, the minimum value between the lithium plating limit continuous current and the thermal limit continuous current of the battery is selected as the charging current to control the charging of the battery. If the battery is currently in discharge mode, then based on the thermal limit current, the current of the battery, and the operating time, and using the relationship C1=∫(I0) 2 -I 11 2 The cumulative thermal limit is calculated using calculus, where C1 is the cumulative thermal limit, I0 is the current of the battery, and I... 11 The thermal limit current is given, and t is the operating time. Furthermore, based on the cumulative thermal limit value, the continuous thermal limit current, and the peak thermal limit current, peak temperature, and continuous temperature of the battery, one of the continuous thermal limit current and the peak thermal limit current is determined as the discharge current to control the discharge of the battery. If the battery is currently in recharge mode, then based on the thermal limit current, the current of the battery, and the operating time, and using the relationship C1=∫(I0) 2 -I 11 2 The cumulative value of the thermal limit is obtained by performing calculus calculations on dt, and the cumulative value of the lithium plating limit is obtained by performing calculus calculations based on the lithium plating limit continuous current, the current of the battery, and the operating time. Based on the cumulative thermal limit value, the continuous thermal limit current, and the peak thermal limit current, peak temperature, and continuous temperature of the battery, one of the continuous thermal limit current and the peak thermal limit current is determined as the first peak current. Based on the cumulative lithium plating limit value, the continuous lithium plating limit current, the peak lithium plating limit current of the battery, the peak temperature, and the continuous temperature, one of the continuous lithium plating limit current and the peak lithium plating limit current is determined as the second peak current. The smaller value between the first peak current and the second peak current is selected as the recharge current to control the battery to recharge. Specifically, determining either the thermal limit continuous current or the thermal limit peak current as the discharge current or the first peak current based on the cumulative thermal limit value, the thermal limit continuous current, and the thermal limit peak current, peak temperature, and continuous temperature of the battery includes: If the cumulative thermal limit value, the peak thermal limit current, the continuous thermal limit current, and the peak temperature satisfy Equation 1: C1 ≤ (I 12 2 -I 11 2 )*T1,I 12 Given the thermal limit peak current and T1 as the peak temperature, the thermal limit peak current is determined as either the discharge current or the first peak current. If the cumulative thermal limit value, the peak thermal limit current, the continuous thermal limit current, the peak temperature, and the continuous temperature satisfy Equation 2: C1≥(I 12 2 -I 11 2 ) * (T2 + T1 / 2), where T2 is the continuous temperature, then the thermal limit continuous current is determined as the discharge current or the first peak current; If the cumulative thermal limit value, the peak thermal limit current, the continuous thermal limit current, the peak temperature, and the continuous temperature satisfy a relationship other than that of Equation 1 and Equation 2, then the discharge current or the first peak current is determined according to the following Equation 3: I3= I 11 -1 / ((T2-T1)*(I 11 +I 12 ))*(C1-(I 12 2 -I 11 2 )*T1) I3 is the discharge current or the first peak current.

2. The method according to claim 1, characterized in that, Also includes: Obtain the current temperature and state of charge of the battery; The lithium plating limit current, thermal limit current, lithium plating limit peak current, and thermal limit peak current corresponding to the current temperature and state of charge of the battery are obtained by looking up the table.

3. The method according to claim 1, characterized in that, When the battery is currently in recharge mode, a cumulative value of the lithium plating limit is obtained by performing calculus calculations based on the lithium plating limit continuous current, the current of the battery, and the operating time, including: Using the relation C2=∫(I0-I 21 The cumulative lithium plating limit is calculated using dt, where C2 is the cumulative lithium plating limit, I0 is the current of the battery, and I... 21 The lithium plating limit current is denoted as .

4. The method according to claim 1 or 3, characterized in that, Based on the cumulative lithium plating limit value, the continuous lithium plating limit current, the peak lithium plating limit current of the battery, the peak temperature, and the continuous temperature, determining one of the continuous lithium plating limit current and the peak lithium plating limit current as the second peak current includes: If the cumulative value of the lithium plating limit, the peak current of the lithium plating limit, the continuous current of the lithium plating limit, and the peak temperature satisfy Equation 4: C2≤(I 22 -I 21 )*T1,I 22 Given the lithium plating limit peak current and T1 as the peak temperature, the lithium plating limit peak current is determined as the second peak current. If the cumulative value of the lithium plating limit, the peak current of the lithium plating limit, the continuous current of the lithium plating limit, the peak temperature, and the continuous temperature satisfy Equation 5: C2≥(I 22 -I 21 ) * (T2 + T1 / 2), where T2 is the sustained temperature, then the lithium plating limit sustained current is determined as the second peak current; If the cumulative lithium plating limit, the continuous lithium plating limit current, the peak lithium plating limit current of the battery, the peak temperature, and the continuous temperature satisfy a relationship other than that of Equation 4 and Equation 5, then the second peak current is determined according to the following Equation 6: I4= I 22 -1 / (T2-T1)*(C2-(I 22 -I 21 )*T1) I4 is the second peak current.

5. The method according to claim 1, characterized in that, The battery is currently in a discharge mode, including when the vehicle to which the battery is mounted is in a driving mode.

6. A charge / discharge management device, characterized in that, Includes a processor connected to a battery to perform the charge / discharge management method as described in any one of claims 1 to 5.

7. A storage medium, characterized in that, The device contains a computer program that, when executed by a processor, implements the charge / discharge management method according to any one of claims 1 to 5.

8. A vehicle, characterized in that, It includes the charge / discharge management device as described in claim 6, or the storage medium as described in claim 7.

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