Battery charging control method and device and electric vehicle

Abstract

The present invention discloses a battery charging control method and device and a battery-powered device such as an electric vehicle. For battery cell control, the battery cell is at least one battery cell in a multi-cell battery, and the method includes: after the multi-cell battery enters a stable charging state, obtaining the actual charging power required to charge the battery cell to a target voltage; determining the equalization duration of the battery cell based on the actual charging power corresponding to the battery cell, wherein the equalization duration is the duration required for a battery cell equalization control circuit matching the battery cell to control the battery cell; controlling the battery cell equalization control circuit matching the battery cell to perform power adjustment on the battery cell within the equalization duration. The present invention solves the technical problem of low accuracy of equalization control of each battery cell in a multi-cell battery in the related art.

Description

Technical Field

[0001] The present invention relates to the field of electronics, and more particularly, to a battery charging control method and device and an electric vehicle. Background Art

[0002] In the process of multi-cell batteries composed of multiple battery cells being applied to random dynamic conditions of vehicles, the performance of each battery cell is usually inconsistent due to differences in production process, service environment, self-discharge, etc., thus causing problems of overcharge, overdischarge and inaccurate state performance prediction of multi-cell batteries.

[0003] At present, the control method provided in the related art uses the results of indirect estimation, such as the capacity difference derived from voltage or the state difference of the charger at the cell level, to implement balancing control on each battery cell in the multi-cell battery. However, for complex working conditions that occur frequently and randomly during vehicle driving, if the above indirect estimation method is used, the accuracy of balancing control on the performance of each battery cell cannot be guaranteed.

[0004] There is no effective solution to the above problems so far. Summary of the invention

[0005] Embodiments of the present invention provide a battery charging control method and device, and a battery-powered device such as an electric vehicle, to at least solve the technical problem of low accuracy in balancing control of each battery cell in a multi-cell battery.

[0006] According to one aspect of an embodiment of the present invention, the present invention provides a battery charging control method for controlling a battery cell, wherein the battery cell is at least one battery cell in a multi-cell battery, comprising: obtaining an actual charging power required to charge the battery cell to a target voltage after the multi-cell battery enters a stable charging state; determining a balancing duration of the battery cell based on the actual charging power corresponding to the battery cell, wherein the balancing duration is a duration required for a battery cell balancing control circuit matching the battery cell to control the battery cell; and a battery cell balancing control circuit matching the battery cell is controlled to perform power regulation on the battery cell within the balancing duration.

[0007] According to another aspect of an embodiment of the present invention, the present invention provides a battery charging control device for controlling a battery cell, wherein the battery cell is at least one battery cell in a multi-cell battery, and comprises: a processor configured to execute computer executable instructions; and a memory for storing the computer executable instructions; when the computer executable instructions are executed by the processor, the device performs the following steps: after the multi-cell battery enters a stable charging state, obtaining an actual charging power required to charge the battery cell to a target voltage; determining a balancing duration of the battery cell based on the actual charging power corresponding to the battery cell, wherein the balancing duration is the duration required for a battery cell balancing control circuit matched with the battery cell to control the battery cell; and a battery cell balancing control circuit matched with the battery cell is controlled to perform power regulation on the battery cell within the balancing duration.

[0008] According to another aspect of an embodiment of the present invention, the present invention provides an electric vehicle capable of controlling a battery cell, wherein the battery cell is at least one battery cell in a multi-cell battery, and comprises: a processor configured to execute computer-executable instructions; and a memory for storing the computer-executable instructions; when the computer-executable instructions are executed by the processor, the device performs the following steps: after the multi-cell battery enters a stable charging state, obtaining an actual charging amount required to charge the battery cell to a target voltage; determining a balancing duration of the battery cell based on the actual charging amount corresponding to the battery cell, wherein the balancing duration is the duration required for a battery cell balancing control circuit matched with the battery cell to control the battery cell; and a battery cell balancing control circuit matched with the battery cell is controlled to perform power regulation on the battery cell within the balancing duration.

[0009] In an embodiment of the present invention, after a multi-cell battery enters a stable charging state, the actual charging power required to charge each battery cell to a target voltage is obtained, the battery equalization duration is determined according to the actual charging power, and the battery cell is controlled to implement power regulation according to the equalization duration. In the above method, since the actual charging power required to charge each battery cell to a target voltage is obtained, power regulation can be performed on the battery cell according to the equalization duration obtained by the actual charging power, and the purpose of accurately regulating each battery cell is achieved. Therefore, the technical problem of low accuracy of equalization control of each battery cell in a multi-cell battery in the related art is solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The drawings described herein are provided to provide a further understanding of the present invention and are considered as a part of the present invention. The illustrative embodiments and descriptions are used to explain the present invention and do not constitute an undue limitation on the present invention. In the drawings:

[0011] Figure 1 is a flow chart of an optional battery charging control method according to an embodiment of the present invention;

[0012] Figure 2 is a schematic diagram of an optional battery charging control method according to an embodiment of the present invention;

[0013] Figure 3 is a schematic diagram of another optional battery charging control method according to an embodiment of the present invention;

[0014] Figure 4 is a schematic diagram of another optional battery charging control method according to an embodiment of the present invention;

[0015] Figure 5 is a schematic diagram of another optional battery charging control method according to an embodiment of the present invention;

[0016] Figure 6 is a schematic structural diagram of an optional battery charging control device according to an embodiment of the present invention; and

[0017] Figure 7 is a schematic structural diagram of an electric vehicle according to an embodiment of the present invention. DETAILED DESCRIPTION

[0018] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention is clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is only a part of the embodiment of the present invention, not all embodiments. On the basis of the embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work should belong to the scope of protection of the present invention.

[0019] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the drawings are intended to distinguish similar objects and do not require a specific order or priority. It should be understood that the data used in this manner can be exchanged under appropriate conditions so that the embodiments of the present disclosure described herein can be implemented in an order other than the order shown or described in the drawings herein. In addition, the terms "comprises", "comprising" and their variations are intended to cover non-exclusive content. For example, a process, method, system, product, or device that includes a series of steps or units does not need to clearly display those steps or units, and may include other inherent steps or units of these processes, methods, products, or devices that are not clearly displayed.

[0020] According to one aspect of an embodiment of the present disclosure, the present invention provides a battery charging control method. Optionally, as an optional implementation, for controlling a battery cell, the battery cell being at least one battery cell in a multi-cell battery, the battery charging control method comprises the following steps.

[0021] S102: After the multi-cell battery enters a stable charging state, obtaining actual charging power required to charge the battery cells to a target voltage.

[0022] S104: Determine a balancing duration of the battery cell based on an actual charging quantity corresponding to the battery cell, wherein the balancing duration is a duration required for a battery cell balancing control circuit matched with the battery cell to control the battery cell.

[0023] S106: The battery cell balancing control circuit matched with the battery cell is controlled to perform power adjustment on the battery cell within the balancing duration.

[0024] Optionally, the battery charging control method can be applied to, but not limited to, a process in which battery cells in a multi-cell battery are controlled to be charged. For example, taking a process in which battery cells in a multi-cell battery installed on an electric vehicle are controlled to be charged as an example, during the multi-cell battery charging process on the electric vehicle, after the multi-cell battery enters a charging stable state, the actual charging power required to charge each battery cell to a target voltage is obtained, the equalization duration of the battery cell is determined according to the actual charging power, and power regulation is performed on the battery cell based on the equalization duration.

[0025] It should be noted that in the related art, each battery cell is usually balanced according to the result of indirect estimation according to the voltage difference between each battery cell during the charging process of the multi-cell battery. However, the above method cannot guarantee the accuracy of the performance of each battery cell by the balancing control. In this embodiment, since the actual charging power required to charge each battery cell to the target voltage is obtained, the battery can be regulated according to the balancing duration obtained according to the actual charging power, so as to achieve the purpose of accurately regulating each battery cell.

[0026] Optionally, as an optional implementation, before obtaining the actual charging power required to charge the battery cell to the target voltage, the following steps are also included.

[0027] S1: Obtain the accumulated charging capacity of the multi-cell battery after it enters the charging state.

[0028] S2: Under the condition that the accumulated charging quantity reaches a first threshold, determining that the multi-unit battery enters a charging stable state.

[0029] For example, refer to Figure 2Describe the above content. For example, a multi-cell battery includes three battery cells. After the multi-cell battery starts charging, each battery cell corresponds to an accumulated charge amount. Figure 3 As shown, it can be seen that under the condition that the cumulative charge capacity of the multi-cell battery reaches the first threshold, all battery cells enter a stable state at t1. The highest voltage (i.e., V1) at t1 is set as the target voltage. When the multi-cell battery is charged after t1, the actual capacity of each battery cell to the target voltage is tracked.

[0030] Optionally, after obtaining the accumulated charging power since the multi-unit battery entered the charging state, the method further includes the following steps.

[0031] S1: Clearing the accumulated charging power under the condition that the accumulated charging power does not reach the first threshold and charging is terminated.

[0032] For example, the above contents are continuously described with reference to the condition that the above multi-cell battery includes the battery cell 1, the battery cell 2, and the battery cell 3. Figure 3 , taking battery cell 1 as an example, battery cell 1 reaches a stable charging state after charging t1. However, in the case where charging is terminated under the condition that the charging time does not reach t1, battery cell 1 does not reach a stable charging state, and the accumulated charging power needs to be cleared. Therefore, at the next charging, the accumulated charging power of battery cell 1 needs to be remeasured. In this way, the problem of inaccuracy of the accumulated charging power obtained under the condition of continuing after charging is terminated can be prevented.

[0033] Optionally, the step of acquiring an actual charging amount required to charge battery cells included in the multi-cell battery to a target voltage includes the following steps.

[0034] S1, obtaining stable battery cell voltages reached by a plurality of battery cells included in a multi-cell battery when the plurality of battery cells enter a stable charging state.

[0035] S2, determining the target voltage according to the stable voltage of the battery cell.

[0036] Optionally, the step of determining the target voltage according to the battery cell stabilized voltage may refer to, but not be limited to, determining the maximum battery cell stabilized voltage among the battery cell stabilized voltages of the battery cells in the multi-cell battery as the target voltage.

[0037] For example, the above case is described continuously with reference to the above condition, where the multi-cell battery includes three battery cells and together with Battery 1 and Battery 2. Figure 4As shown, it is an optional graph of the voltage change of battery cell 1 and battery cell 2 over time. At time t1, both battery cell 1 and battery cell 2 reach a stable state of charge. At this time, the battery cell stable voltage of battery cell 1 is V1, and the battery cell stable voltage of battery cell 2 is V2. When V1 is determined as the target voltage, V2 needs to be adjusted. In the process of adjusting V2 to V1, time changes from t1 to t2. At this time, the actual charging capacity of battery cell 2 in the process from t1 to t2 is calculated. Therefore, the actual capacity of the tracked battery cell (i.e., battery cell 2) to the target voltage is the capacity difference between the tracked battery cell and the battery cell with the highest voltage.

[0038] It should be noted that in order to align the capacities of all battery cells with the battery cell with the lowest capacity, the actual balancing capacity is obtained by subtracting the target voltage from the actual capacity of each battery cell when the actual capacity of all battery cells is the largest.

[0039] For example, the balanced capacity of each battery cell should be the difference between the average actual capacity of all battery cells and the actual capacity of each battery cell. During the whole process, the current should be stable, which means that the current change should be within a given threshold, such as 2A, depending on the value of the internal resistance of the battery cell. If the current change exceeds the given threshold, the whole process must start from the beginning and all accumulated capacities will be reset to zero.

[0040] Through the above method, the accuracy and efficiency of obtaining the actual charging power are improved.

[0041] Optionally, in the process of obtaining the actual charging amount required to charge the battery cell to the target voltage, the method further includes the following steps.

[0042] S1, obtaining the battery cell temperature in the current environment of the battery cell.

[0043] S2, temperature compensation is performed on the actual charging capacity corresponding to the battery cell according to the temperature curve. Here, when the battery cell temperature in the environment where the battery cell is located is greater than the target temperature, the actual charging capacity is reduced according to the first ratio shown in the temperature curve. When the battery cell temperature in the environment where the battery cell is located is less than the target temperature, the actual charging capacity is increased according to the second ratio shown in the temperature curve.

[0044] For example, referring to the condition that a multi-cell battery includes three battery cells and taking battery cell 1 as an example, the above content is described. Since temperature affects the actual charging capacity of the battery cell, the battery cell temperature of the current environment also needs to be obtained during the calculation of the actual charging capacity. For example, the target temperature is represented by T, and the corresponding compensation ratio is 1. When the battery cell temperature is c (c > b), the compensation ratio r1 corresponding to the battery cell temperature c needs to be used to perform temperature compensation on the actual charging capacity. When the battery cell temperature is a (a < b), the compensation ratio r2 corresponding to the battery cell temperature a needs to be used to perform temperature compensation on the actual charging capacity. Among them, the compensation ratio r1 can be equal to the compensation ratio r2, or the compensation ratio r1 can be different from the compensation ratio r2, which is determined by the temperature curve.

[0045] Therefore, the influence of different battery cell temperatures on the battery charging equalization process is prevented, and the equalization efficiency of the multi-cell battery is improved.

[0046] Optionally, the step of determining the equalization duration of the battery cell based on the actual charging capacity corresponding to the battery cell includes the following steps.

[0047] S1, obtain the unit equalization capacity configured to the battery cell equalization control circuit to match the battery cell.

[0048] S2, obtain the ratio of the actual charging capacity to the unit equalization capacity, and set the battery equalization duration corresponding to the battery cell to be equal to this ratio.

[0049] For example, referring to the condition that the above multi-cell battery includes battery cell 1, battery cell 2, and battery cell 3, the above content is continuously described. Referring to Figure 5 , taking battery cell 1 as an example, the battery cell equalization control circuit A is used to control battery cell 1 of the multi-cell battery, and each battery cell balance control circuit has a unit equalization capacity. After obtaining the actual charging capacity of battery cell 1, the following formula is used to obtain the equalization duration:

[0050] Equalization duration = actual charging capacity / unit equalization capacity.

[0051] Through the above formula, the equalization duration can be accurately and effectively obtained, and the efficiency of obtaining the equalization duration is improved.

[0052] Optionally, the battery cell equalization control circuit matched with the battery cell is controlled to perform power adjustment on the battery cell within the equalization duration, including the following steps.

[0053] S1, the battery cell balancing control circuit matched with the battery cell is controlled to stop regulating the power of the battery cell when the balancing duration ends and the multi-cell battery has been balanced.

[0054] S2, when the end moment of the balancing duration is reached and the multi-cell battery is unbalanced, obtaining the updated actual charging power corresponding to the battery cell; determining the updated balancing duration based on the updated actual charging power; and the battery cell balancing control circuit matched with the battery cell is controlled to perform power regulation on the battery cell within the updated balancing duration.

[0055] For example, the above contents are described continuously with reference to the condition that the above multi-cell battery includes three battery cells. After the battery cell balancing control circuit is used to balance battery cell 1, battery cell 2 and battery cell 3 respectively within the balancing duration, if the multi-cell battery is still unbalanced, it is necessary to obtain an updated actual charging power; then, the balancing duration is determined according to the new actual charging power, and battery cell 1, battery cell 2 and battery cell 3 are balanced. In the process of balancing battery cell 1, battery cell 2 and battery cell 3 using the battery cell balancing control circuit, if the multi-cell battery reaches a balanced state before the balancing duration, the balancing of the multi-cell battery is stopped. In this way, the balancing of the multi-cell battery can be stopped in time.

[0056] It should be noted that, in order to make the description concise, the aforementioned method embodiment is represented as a series of actions. However, it should be understood by those skilled in the art that the present invention is not limited to the described order of actions, because some steps according to the present invention can be performed in other orders or simultaneously. In addition, it should also be known by those skilled in the art that all embodiments described in the specification belong to preferred embodiments, and related actions and modules are not necessarily limited to the present invention.

[0057] According to another aspect of the embodiment of the present invention, the present invention further provides a battery charging control device for implementing the above-mentioned battery charging control method. Figure 6 As shown, the device is used for controlling a battery cell, where the battery cell is at least one battery cell in a multi-cell battery. The device includes a processor 604 and a memory 602.

[0058] (1) Processor 604 is configured to execute computer-executable instructions.

[0059] (2) The memory 602 is configured to store computer executable instructions; when the computer executable instructions are executed by the processor, the apparatus is enabled to perform the following steps.

[0060] S1, after the multi-cell battery enters a charging stable state, obtaining actual charging power required to charge the battery cells to a target voltage.

[0061] S2, determining the balancing duration of the battery cell based on the actual charging power corresponding to the battery cell, wherein the balancing duration is the duration required for the battery cell balancing control circuit matched with the battery cell to control the battery cell

[0062] S3, the battery cell balancing control circuit matched with the battery cell is controlled to perform power adjustment on the battery cell within the balancing duration.

[0063] Optionally, the battery charging control device may further include but is not limited to a transmission unit 606 , a display unit 608 and a connection bus 610 .

[0064] (3) The transmission unit 606 is configured to receive or send data via a network.

[0065] (4) The display unit 608 is configured to display the balancing status of the multi-cell battery.

[0066] (5) The connection bus 610 is configured to connect each modular component in the battery charging control device.

[0067] It should be noted that in the related art, each battery cell is usually balanced according to the result of indirect estimation according to the voltage difference between each battery cell during the charging process of the multi-cell battery. However, the above method cannot guarantee the accuracy of the performance of each battery cell by the balancing control. In this embodiment, since the actual charging power required to charge each battery cell to the target voltage is obtained, the battery can be regulated according to the balancing duration obtained according to the actual charging power, so as to achieve the purpose of accurately regulating each battery cell.

[0068] Optionally, as an optional implementation, before obtaining the actual charging power required to charge the battery cell to the target voltage, the following steps are also included.

[0069] S1: Obtain the accumulated charging capacity of the multi-cell battery after it enters the charging state.

[0070] S2: Under the condition that the accumulated charging quantity reaches a first threshold, determining that the multi-unit battery enters a charging stable state.

[0071] For example, refer to Figure 2 Describe the above content. For example, a multi-cell battery includes three battery cells. After the multi-cell battery starts charging, each battery cell corresponds to an accumulated charge amount. Figure 3As shown, it can be seen that under the condition that the cumulative charge capacity of the multi-cell battery reaches the first threshold, all battery cells enter a stable state at t1. The highest voltage (i.e., V1) at t1 is set as the target voltage. When the multi-cell battery is charged after t1, the actual capacity of each battery cell to the target voltage is tracked.

[0072] Optionally, after obtaining the accumulated charging power since the multi-unit battery entered the charging state, the method further includes the following steps.

[0073] S1: Clearing the accumulated charging power under the condition that the accumulated charging power does not reach the first threshold and charging is terminated.

[0074] For example, the above contents are continuously described with reference to the condition that the above multi-cell battery includes the battery cell 1, the battery cell 2, and the battery cell 3. Figure 3 , taking battery cell 1 as an example, battery cell 1 reaches a stable charging state after charging t1. However, in the case where charging is terminated under the condition that the charging time does not reach t1, battery cell 1 does not reach a stable charging state, and the accumulated charging power needs to be cleared. Therefore, at the next charging, the accumulated charging power of battery cell 1 needs to be remeasured. In this way, the problem of inaccuracy of the accumulated charging power obtained under the condition of continuing after charging is terminated can be prevented.

[0075] Optionally, the step of acquiring an actual charging amount required to charge battery cells included in the multi-cell battery to a target voltage includes the following steps.

[0076] S1, obtaining stable battery cell voltages reached by a plurality of battery cells included in a multi-cell battery when the plurality of battery cells enter a stable charging state.

[0077] S2, determining the target voltage according to the stable voltage of the battery cell.

[0078] Optionally, the step of determining the target voltage according to the battery cell stabilized voltage may refer to, but not be limited to, determining the maximum battery cell stabilized voltage among the battery cell stabilized voltages of the battery cells in the multi-cell battery as the target voltage.

[0079] For example, the above case is described continuously with reference to the above condition, where the multi-cell battery includes three battery cells and together with Battery 1 and Battery 2. Figure 4As shown, it is an optional graph of the voltage change of battery cell 1 and battery cell 2 over time. At time t1, both battery cell 1 and battery cell 2 reach a stable state of charge. At this time, the battery cell stable voltage of battery cell 1 is V1, and the battery cell stable voltage of battery cell 2 is V2. When V1 is determined as the target voltage, V2 needs to be adjusted. In the process of adjusting V2 to V1, time changes from t1 to t2. At this time, the actual charging capacity of battery cell 2 in the process from t1 to t2 is calculated. Therefore, the actual capacity of the tracked battery cell (i.e., battery cell 2) to the target voltage is the capacity difference between the tracked battery cell and the battery cell with the highest voltage.

[0080] It should be noted that in order to align the capacities of all battery cells with the battery cell with the lowest capacity, the actual balancing capacity is obtained by subtracting the target voltage from the actual capacity of each battery cell when the actual capacity of all battery cells is the largest.

[0081] For example, the balanced capacity of each battery cell should be the difference between the average actual capacity of all battery cells and the actual capacity of each battery cell. During the whole process, the current should be stable, which means that the current change should be within a given threshold, such as 2A, depending on the value of the internal resistance of the battery cell. If the current change exceeds the given threshold, the whole process must start from the beginning and all accumulated capacities will be reset to zero.

[0082] Through the above method, the accuracy and efficiency of obtaining the actual charging power are improved.

[0083] Optionally, in the process of obtaining the actual charging amount required to charge the battery cell to the target voltage, the method further includes the following steps.

[0084] S1, obtaining the battery cell temperature in the current environment of the battery cell.

[0085] S2, temperature compensation is performed on the actual charging capacity corresponding to the battery cell according to the temperature curve. Here, when the battery cell temperature in the environment where the battery cell is located is greater than the target temperature, the actual charging capacity is reduced according to the first ratio shown in the temperature curve. When the battery cell temperature in the environment where the battery cell is located is less than the target temperature, the actual charging capacity is increased according to the second ratio shown in the temperature curve.

[0086] For example, with reference to the condition that a multi-cell battery includes three battery cells and taking battery cell 1 as an example, the above content is described. Since temperature affects the actual charging power of the battery cell, it is also necessary to obtain the battery cell temperature of the current environment during the calculation of the actual charging power. For example, the target temperature is represented by T, and the corresponding compensation ratio is 1. When the battery cell temperature is c (c > b), it is necessary to use the compensation ratio r1 corresponding to the battery cell temperature c to perform temperature compensation on the actual charging power. When the battery cell temperature is a (a < b), it is necessary to use the compensation ratio r2 corresponding to the battery cell temperature a to perform temperature compensation on the actual charging power. Among them, the compensation ratio r1 may be equal to the compensation ratio r2, or the compensation ratio r1 may be different from the compensation ratio r2, which is determined by the temperature curve.

[0087] Therefore, the influence of different battery cell temperatures on the battery charging equalization process is prevented, and the equalization efficiency of the multi-cell battery is improved.

[0088] Optionally, the step of determining the equalization duration of the battery cell based on the actual charging power corresponding to the battery cell includes the following steps.

[0089] S1, obtain the unit equalization power configured to the battery cell equalization control circuit to match the battery cell.

[0090] S2, obtain the ratio of the actual charging power to the unit equalization power, and set the battery equalization duration corresponding to the battery cell to be equal to this ratio.

[0091] For example, with reference to the condition that the above multi-cell battery includes battery cell 1, battery cell 2, and battery cell 3, the above content is continuously described. Refer to Figure 5 , taking battery cell 1 as an example, the battery cell equalization control circuit A is used to control battery cell 1 of the multi-cell battery, and each battery cell balance control circuit has a unit equalization power. After obtaining the actual charging power of battery cell 1, the following formula is used to obtain the equalization duration:

[0092] Equalization duration = actual charging power / unit equalization power.

[0093] Through the above formula, the equalization duration can be accurately and effectively obtained, and the efficiency of obtaining the equalization duration is improved.

[0094] Optionally, the battery cell equalization control circuit matched with the battery cell is controlled to perform power adjustment on the battery cell within the equalization duration, including the following steps.

[0095] S1, the battery cell balancing control circuit matched with the battery cell is controlled to stop regulating the power of the battery cell when the balancing duration ends and the multi-cell battery has been balanced.

[0096] S2, when the end moment of the balancing duration is reached and the multi-cell battery is unbalanced, obtaining the updated actual charging power corresponding to the battery cell; determining the updated balancing duration based on the updated actual charging power; and the battery cell balancing control circuit matched with the battery cell is controlled to perform power regulation on the battery cell within the updated balancing duration.

[0097] For example, the above contents are described continuously with reference to the condition that the above multi-cell battery includes three battery cells. After the battery cell balancing control circuit is used to balance battery cell 1, battery cell 2 and battery cell 3 respectively within the balancing duration, if the multi-cell battery is still unbalanced, it is necessary to obtain an updated actual charging power; then, the balancing duration is determined according to the new actual charging power, and battery cell 1, battery cell 2 and battery cell 3 are balanced. In the process of balancing battery cell 1, battery cell 2 and battery cell 3 using the battery cell balancing control circuit, if the multi-cell battery reaches a balanced state before the balancing duration, the balancing of the multi-cell battery is stopped. In this way, the balancing of the multi-cell battery can be stopped in time.

[0098] According to another aspect of the embodiment of the present disclosure, Figure 7 As shown, an electric vehicle for implementing the above-mentioned battery charging control method is also provided. For each battery cell in at least one battery cell in the multi-cell battery, the electric vehicle includes a processor 704 and a memory 702.

[0099] (1) Processor 704 is configured to execute computer-executable instructions.

[0100] (2) The memory 702 is configured to store computer executable instructions; when the computer executable instructions are executed by the processor, the electric vehicle is enabled to perform the following steps.

[0101] S1, after the multi-cell battery enters a charging stable state, obtaining actual charging power required to charge the battery cells to a target voltage.

[0102] S2, determining the balancing duration of the battery cell based on the actual charging power corresponding to the battery cell, wherein the balancing duration is the duration required for the battery cell balancing control circuit matched with the battery cell to control the battery cell

[0103] S3, the battery cell balancing control circuit matched with the battery cell is controlled to perform power adjustment on the battery cell within the balancing duration.

[0104] Optionally, the electric vehicle may further include, but is not limited to, a transmission unit 706 , a display unit 708 and a connection bus 710 .

[0105] (3) The transmission unit 706 is configured to receive or send data via a network.

[0106] (4) The display unit 708 is configured to display the balancing status of the multi-cell battery.

[0107] (5) The connection bus 710 is configured to connect each modular component in the battery charging control device.

[0108] In this embodiment, since the actual charging power of each battery cell when it is charged to the target voltage is obtained, the power of the battery cell can be adjusted according to the equalization duration obtained by the actual charging power, so as to achieve the purpose of accurately adjusting each battery cell. In addition, the performance of the multi-cell battery is improved, thereby improving the performance of the electric vehicle.

[0109] The serial numbers of the embodiments of the present invention are only used for description and do not represent the advantages or disadvantages of the embodiments.

[0110] If implemented in the form of software functional units and sold or used as independent products, the integrated units in the embodiments may also be stored in a computer-readable storage medium. Based on such an understanding, the essence of the technical solution of the present invention or the construction of parts of traditional technology may be implemented in the form of a software product. The computer software product is stored in a storage medium, which includes a plurality of instructions for enabling one or more terminal devices (which may be PC computers, servers or network devices, etc.) to execute the methods in each embodiment of the present invention.

[0111] In the above-mentioned embodiments of the present invention, each embodiment is described with emphasis respectively, and for parts not elaborated in some embodiments, reference may be made to the relevant descriptions of other embodiments.

[0112] In some embodiments provided by the present invention, it will be understood that the disclosed client can be implemented in other ways, where the above-mentioned device embodiments are only exemplary. For example, the division of units can be a division of logical functions, and there can be additional division modes during actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be omitted or may not be performed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed can be performed via some interfaces, and the indirect coupling or communication connection between units or modules can be in electrical or other forms.

[0113] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units. That is, these units or components may be located in one location or dispersed over multiple network units. Some or all of the units may be selected according to actual needs to implement the solutions in the embodiments of the present invention.

[0114] In addition, all functional units in the embodiments of the present invention may be integrated into a processing unit, or exist as independent physical units, or more than two units may be integrated into one unit. The integrated unit may be implemented in the form of hardware or software functional units.

[0115] The above are only preferred embodiments of the present invention. It should be noted that those skilled in the art may make some improvements and modifications without departing from the concept of the present invention. These improvements and modifications should fall within the scope of protection of the present invention.

Claims

1. A battery charging control method for controlling a battery cell, wherein the battery cell is at least one battery cell in a multi-cell battery, the method comprising: After the multi-cell battery enters a charging stable state, obtaining actual charging power required to charge the battery cells to a target voltage; Determine a balancing duration of the battery cell based on an actual charge quantity corresponding to the battery cell, wherein the balancing duration is a duration required for a battery cell balancing control circuit matched with the battery cell to control the battery cell; Controlling a battery cell balancing control circuit matched with the battery cell to perform power adjustment on the battery cell within the balancing duration; Before obtaining the actual charging capacity required to charge the battery cell to the target voltage, the following steps are also included: Obtaining the accumulated charge capacity of the multi-cell battery after it enters a charging state; Under the condition that the accumulated charged power reaches a first threshold, it is determined that the multi-unit battery enters a charging stable state.

2. The method according to claim 1, wherein: Before obtaining the actual charging capacity required to charge the battery cell to the target voltage, the following steps are also included: Acquire battery cell stable voltages reached by a plurality of battery cells included in the multi-cell battery when entering a charging stable state; The target voltage is determined based on the battery cell stable voltage.

3. The method according to claim 1, wherein: After obtaining the accumulated charging power since the multi-cell battery enters the charging state, the following steps are also included: The accumulated charge power is cleared under the condition that the accumulated charge power does not reach the first threshold and the charging is terminated.

4. The method according to claim 1, wherein: The step of obtaining the actual charging power required to charge the battery cell to the target voltage specifically includes: Get the battery cell temperature in the current battery cell environment; Temperature compensation is performed on the actual charging capacity corresponding to the battery cell according to the temperature curve, wherein, under the condition that the battery cell temperature in the current environment of the battery cell is greater than the target temperature, the actual charging capacity is lowered according to the first ratio shown in the temperature curve; under the condition that the battery cell temperature in the current environment of the battery cell is less than the target temperature, the actual charging capacity is increased according to the second ratio shown in the temperature curve.

5. The method according to claim 1, wherein: The step of determining the balancing duration of the battery cells based on the actual charging quantity corresponding to the battery cells specifically includes: Obtaining a unit balancing power configured to a battery cell balancing control circuit to match the battery cell; The ratio of the actual charging power to the unit balancing power is obtained, and the battery balancing duration corresponding to the battery unit is set to be equal to the ratio.

6. The method according to claim 1, wherein: The step of controlling the battery cell balancing control circuit matched with the battery cell to perform power adjustment on the battery cell within the balancing duration specifically includes: Controlling a battery cell balancing control circuit matched with the battery cell to stop regulating the power of the battery cell when the balancing duration ends and the multiple battery cells have been balanced; Under the condition that the end time of the balancing duration is reached and the multi-cell battery is unbalanced, an updated actual charging power corresponding to the battery cell is obtained; an updated balancing duration is determined based on the updated actual charging power; and a battery cell balancing control circuit matched with the battery cell is controlled to perform power regulation on the battery cell within the updated balancing duration.

7. A battery charging control device for controlling a battery cell, wherein the battery cell is at least one battery cell in a multi-cell battery, the device comprising: a processor configured to execute computer executable instructions; as well as a memory configured to store computer executable instructions; The computer executable instructions, when executed by a processor, enable the apparatus to perform the following steps: After the multi-cell battery enters a charging stable state, obtaining actual charging power required to charge the battery cells to a target voltage; Determine a balancing duration of the battery cell based on an actual charge quantity corresponding to the battery cell, wherein the balancing duration is a duration required for a battery cell balancing control circuit matched with the battery cell to control the battery cell; Controlling a battery cell balancing control circuit matched with the battery cell to perform power adjustment on the battery cell within the balancing duration; Before obtaining the actual charging capacity required to charge the battery cell to the target voltage, the following steps are also included: Obtaining the accumulated charge capacity of the multi-cell battery after it enters a charging state; Under the condition that the accumulated charged power reaches a first threshold, it is determined that the multi-unit battery enters a charging stable state.

8. An electric vehicle for battery cell control, wherein the battery cell is at least one battery cell in a multi-cell battery, the electric vehicle comprising: a processor configured to execute computer executable instructions; as well as a memory configured to store computer executable instructions; The computer executable instructions, when executed by a processor, enable the apparatus to perform the following steps: After the multi-cell battery enters a charging stable state, obtaining actual charging power required to charge the battery cells to a target voltage; Determine a balancing duration of the battery cell based on an actual charge quantity corresponding to the battery cell, wherein the balancing duration is a duration required for a battery cell balancing control circuit matched with the battery cell to control the battery cell; Controlling a battery cell balancing control circuit matched with the battery cell to perform power adjustment on the battery cell within the balancing duration; Before obtaining the actual charging capacity required to charge the battery cell to the target voltage, the following steps are also included: Obtaining the accumulated charge capacity of the multi-cell battery after it enters a charging state; Under the condition that the accumulated charged power reaches a first threshold, it is determined that the multi-unit battery enters a charging stable state.

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