Battery circuit, battery circuit control method, device, and medium

Abstract

A battery circuit, a battery circuit control method, a device, and a medium. The battery circuit comprises a processing module, an energy storage module, and at least one battery module, wherein the processing module is connected to a control end of the energy storage module and a control end of the battery module so as to control at least one first battery cell to be connected to one energy storage unit.

Description

Battery circuit, battery circuit control method, device and medium

[0001] This application claims priority to Chinese patent applications with application number 202410138040.6 filed with the Patent Office of China on January 30, 2024, with the invention name “Battery circuit, control method, device and medium for battery circuit” and application number 202410133534.5 filed with the Patent Office of China on January 30, 2024, with the invention name “Battery circuit, control method, device and medium for battery circuit”, the entire contents of which are incorporated into this application by reference. Technical Field

[0002] The present application relates to the field of battery technology, and more specifically, to a battery circuit, a control method for a battery circuit, an electronic device, and a computer-readable storage medium. Background Art

[0003] Generally, power batteries with a capacity decline of 80% are considered "retired batteries." To avoid waste, the battery cells with good performance in retired power batteries can be reassembled.

[0004] However, when the reassembled power batteries are reused, it is necessary to perform voltage balancing on them. Technical issues

[0005] One objective of the present application is to provide a new battery circuit, a control method, a device, and a medium for the battery circuit, so as to provide a hardware basis for voltage balancing control between battery cells. Technical Solutions

[0006] According to a first aspect of the present application, a battery circuit is provided, comprising a processing module, an energy storage module, and at least one battery pack, wherein the energy storage module comprises two groups of energy storage units connected in parallel; for any of the battery packs, the battery packs are connected in parallel at both ends of the energy storage module, and the battery pack comprises a first bridge arm, wherein the first bridge arm comprises at least two first battery cells connected in series; the processing module is connected to a control end of the energy storage module and a control end of the battery pack, and is configured to control at least one first battery cell in at least one of the battery packs to be connected to an energy storage unit in the energy storage module.

[0007] According to a second aspect of the present application, a battery circuit is provided, comprising an energy storage unit, at least one battery pack and a processing unit. For any battery pack, the battery pack is connected in parallel at both ends of the energy storage unit, and the battery pack includes a first bridge arm, and the first bridge arm includes at least two first battery cells connected in series; the processing unit is connected to the control end of the energy storage unit and the control end of any first bridge arm, and is used to control at least one first battery cell in at least one first bridge arm to be connected to the energy storage unit; wherein the rated voltages of different first battery cells are the same.

[0008] According to a third aspect of the present application, a method for controlling a battery circuit is provided, the method comprising:

[0009] When a voltage balancing condition within a bridge arm is met, the num1 first discharge battery cells in the first target bridge arm are controlled to charge the first target energy storage unit in the energy storage module; when the voltage of the first target energy storage unit is the same as the voltage across the num1 first discharge battery cells, the num1 first discharge battery cells in the first target bridge arm are controlled to stop charging the first target energy storage unit; and the first target energy storage unit is controlled to charge the num2 first charge battery cells in the first target bridge arm; wherein the first target energy storage unit is an energy storage unit in the energy storage module that is different from the energy storage unit used for the previous voltage balancing; the battery circuit includes: an energy storage module and a battery pack, the energy storage module includes two groups of energy storage units connected in parallel, the battery pack includes a bridge arm, and the bridge arm includes at least two battery cells connected in series.

[0010] According to a fourth aspect of the present application, a method for controlling a battery circuit is provided, the method comprising: controlling num1 first discharge battery cells in a first target bridge arm to charge an energy storage unit when a voltage balance condition within the bridge arm is satisfied; controlling num1 first discharge battery cells in the first target bridge arm to stop charging the energy storage unit when the voltage of the energy storage unit is the same as the voltage across the num1 first discharge battery cells; and controlling the energy storage unit to charge num2 first charge battery cells in the first target bridge arm; wherein the battery circuit comprises: an energy storage unit, a battery pack, the battery pack comprising a bridge arm, and the bridge arm comprising at least two battery cells connected in series.

[0011] According to a fifth aspect of the present application, an electronic device is provided, comprising a battery circuit as described in any one of the first aspects; or, the electronic device comprises a memory and a processor, the memory being used to store computer instructions, and the processor being used to call the computer instructions from the memory to execute a method as described in any one of the second aspects.

[0012] According to a sixth aspect of the present application, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the method according to any one of the second aspects is implemented. Beneficial effects

[0013] An embodiment of the present application provides a battery circuit comprising: a processing module, an energy storage module, and at least one battery pack, wherein: the energy storage module includes two parallel groups of energy storage units; for any battery pack, the battery packs are connected in parallel at both ends of the energy storage module, and the battery pack includes a first bridge arm, which includes at least two first battery cells connected in series; the processing module is connected to a control terminal of the energy storage module and a control terminal of the battery pack, and is configured to control the connection of at least one first battery cell in at least one battery pack to an energy storage unit in the energy storage module. The battery circuit provided in the embodiment of the present application provides the hardware foundation for voltage balancing control between battery cells. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] FIG1 is a structural schematic diagram 1 of a battery circuit provided in an embodiment of the present application;

[0015] FIG2 is a second structural diagram of a battery circuit provided in an embodiment of the present application;

[0016] FIG3 is a third structural diagram of a battery circuit provided in an embodiment of the present application;

[0017] FIG4 is a fourth structural diagram of a battery circuit provided in an embodiment of the present application;

[0018] FIG5 is a fifth structural diagram of a battery circuit provided in an embodiment of the present application;

[0019] FIG6 is a sixth structural diagram of a battery circuit provided in an embodiment of the present application;

[0020] FIG7 is a seventh structural diagram of a battery circuit provided in an embodiment of the present application;

[0021] FIG8 is a structural schematic diagram 8 of a battery circuit provided in an embodiment of the present application;

[0022] FIG9 is a ninth structural diagram of a battery circuit provided in an embodiment of the present application;

[0023] FIG10 is a flowchart of a method for controlling a battery circuit according to an embodiment of the present application;

[0024] FIG11 is a second flow chart of a method for controlling a battery circuit according to an embodiment of the present application;

[0025] FIG12 is a schematic structural diagram of an electronic device provided in an embodiment of the present application. Modes for Carrying Out the Invention

[0026] To make the purpose, technical solutions and effects of this application clearer and more specific, the following further describes this application in detail with reference to the accompanying drawings and examples. It should be understood that the specific examples described herein are only used to explain this application and are not intended to limit this application.

[0027] <Battery Circuit Example>

[0028] The present application provides a battery circuit 10 , as shown in FIG1 , the battery circuit 10 includes an energy storage module 11 , at least one battery pack and a processing module 19 ;

[0029] The energy storage module 11 includes two sets of energy storage units connected in parallel;

[0030] For any battery pack, the battery pack is connected in parallel at both ends of the energy storage module 11, and the battery pack includes a first bridge arm, and the first bridge arm includes at least two first battery cells connected in series;

[0031] The processing module 19 is connected to the control end of the energy storage module 11 and the control end of the battery pack, and is used to control at least one first battery cell in at least one battery pack to be connected to an energy storage unit in the energy storage module 11 .

[0032] The processing module 19 is connected to the control terminal of the energy storage module 11 and the control terminal of the battery pack, and is used to control at least one first battery cell in at least one battery pack to connect to an energy storage unit in the energy storage module 11. In one example, the processing module 19 can be exemplarily an MCU.

[0033] The energy storage module 11 is used to store and release electrical energy. As shown in Figure 1, the energy storage module 11 specifically includes a first energy storage unit 111 and a second energy storage unit 112. In one example, the first energy storage unit 111 may specifically include a capacitor device or at least two capacitor devices connected in series. Figure 1 shows an example in which the first energy storage unit 111 and the second energy storage unit 112 both include three capacitors connected in series. Among them, the first energy storage unit 111 includes capacitor 1112a, capacitor 1112b, and capacitor 1112c. The second energy storage unit 112 includes capacitor 1122a, capacitor 1122b, and capacitor 1122c.

[0034] The battery packs 12 are connected in parallel at both ends of the energy storage module 11. For any battery pack, the first bridge arm includes at least two first battery cells connected in series. Figure 1 illustrates the battery packs as an example, specifically including battery pack 12a and battery pack 12b. Battery pack 12a includes a first bridge arm 12a2, and battery pack 12b includes a second bridge arm 121b2. First bridge arm 12a2 includes a first battery cell 12a21a, a first battery cell 12a21b, and a first battery cell 12a21c. Second bridge arm 12b2 includes a first battery cell 12b21a, a first battery cell 12b21b, a first battery cell 12b21c, and a first battery cell 12b21d.

[0035] Taking the example of processing module 19 controlling the connection of two first battery cells in a battery pack to the first energy storage unit, based on the above description, it can be seen that processing module 19, by controlling the first energy storage unit and any battery pack, controls the connection of two first battery cells in a first bridge arm to the first energy storage unit. In this way, the two first battery cells in the first bridge arm charge the first energy storage unit. As charging progresses, the voltages corresponding to the two first battery cells in the first bridge arm decrease, while the voltage across the first energy storage unit increases. When the voltages corresponding to the two first battery cells in the first bridge arm equal the voltage across the first energy storage unit, the two first battery cells in the first bridge arm stop charging the first energy storage unit. Furthermore, processing module 19, by controlling the first energy storage unit and the first bridge arm, can release the stored energy in the first energy storage unit to the other two first battery cells in the first bridge arm, or to the two first battery cells in another first bridge arm. This results in the voltages of the other two first battery cells in the first bridge arm, or to the two first battery cells in another first bridge arm, increasing. Based on this principle, voltage balancing between the first battery cells in the battery circuit provided by the embodiment of the present application can be achieved. In other words, the battery circuit provided by the embodiment of the present application provides a hardware foundation for voltage balancing control between battery cells.

[0036] It should be noted that the purpose of providing two energy storage units in the energy storage module is that the battery packs in the battery circuit provided in the embodiment of the present application are obtained by reassembling retired single cells, and the voltages across different battery packs are not exactly the same. As a result, the maximum voltage across the energy storage unit used for the previous voltage equalization during operation may not be the same as the maximum voltage across the energy storage unit used for the current voltage equalization during operation. If they are different, the energy storage unit used for the previous voltage equalization cannot be used for the current voltage equalization. Therefore, in this embodiment, different energy storage units in the energy storage module need to be used during two consecutive voltage equalization processes.

[0037] In summary, the embodiments of the present application provide a battery circuit comprising: a processing module 19, an energy storage module, and at least one battery pack, wherein: the energy storage module includes two parallel groups of energy storage units; for any battery pack, the battery packs are connected in parallel at both ends of the energy storage module, and the battery pack includes a first bridge arm, and the first bridge arm includes at least two first battery cells connected in series; the processing module 19 is connected to the control end of the energy storage module and the control end of the battery pack, and is used to control at least one first battery cell in at least one battery pack to be connected to an energy storage unit in the energy storage module. The battery circuit provided by the embodiments of the present application provides the hardware foundation for voltage balancing control between battery cells.

[0038] In one embodiment of the present application, in order to enable the processing module 19 to control the connection between different battery packs and energy storage units, as shown in FIG1 , for any battery pack, the following is further included:

[0039] A first switch and a second switch, wherein:

[0040] The first end of the energy storage module 11, the first switch, the first bridge arm, the second switch and the second end of the energy storage module 11 are connected in sequence;

[0041] The processing module 19 is connected to the control ends of the first switch and the second switch.

[0042] It should be noted that, based on FIG1 , the battery pack 12a includes a first switch 12a1 and a second switch 12a3, the battery pack 12b includes a first switch 12b1 and a second switch 12b3, and the battery pack 12c includes a first switch 12c1 and a second switch 12c3.

[0043] In this embodiment, for any battery pack, when the processing module 19 controls the first switch and the second switch to be turned on, the processing module 19 can control the battery pack to be connected to the energy storage module. Conversely, when the processing module 19 controls the first switch and the second switch to be turned off, the processing module 19 can control the battery pack to be disconnected from the energy storage module.

[0044] In one example, as shown in FIG1 , processing module 19 controls first switch 12a1 and second switch 12a3 to be turned on, thereby controlling battery pack 12a to connect to the energy storage module. Processing module 19 controls first switch 12b1 and second switch 12b3 to be turned on, thereby controlling battery pack 12b to connect to the energy storage module.

[0045] In this embodiment, by providing a first switch and a second switch for each battery pack, the processing module 19 can select the battery pack connected to the energy storage module.

[0046] In one embodiment of the present application, in order to enable the processing module 19 to control the connection between different first battery cells in the first bridge arm and the energy storage module, as shown in FIG1 , the first bridge arm further includes a third switch and a fourth switch, and any first battery cell is connected in series with the third switch and then connected in parallel with the fourth switch;

[0047] The processing module 19 is connected to the control ends of the third switch and the fourth switch.

[0048] 1 as an example, the first battery cell 12a21a is connected in series with the third switch 12a22a, and the first battery cell 12a21a is connected in parallel with the fourth switch 12a23a; the first battery cell 12a21b is connected in series with the third switch 12a22b, and the first battery cell 12a21b is connected in parallel with the fourth switch 12a23b; the first battery cell 12a21c is connected in series with the third switch 12a22c, and the first battery cell 12a21c is connected in parallel with the fourth switch 12a23c.

[0049] The first battery cell 12b21a is connected in series with the third switch 12b22a, and in parallel with the fourth switch 12b23a. The first battery cell 12b21b is connected in series with the third switch 12b22b, and in parallel with the fourth switch 12b23b. The first battery cell 12b21c is connected in series with the third switch 12b22c, and in parallel with the fourth switch 12b23c. The first battery cell 12b21d is connected in series with the third switch 12b22d, and in parallel with the fourth switch 12b23d.

[0050] In this embodiment, for any first bridge arm, when the first switch and second switch corresponding to the first bridge arm are turned on, that is, when the first bridge arm is connected to the energy storage module, the processing module 19 controls the third switch connected in series with a first battery cell to be turned on and the fourth switch connected in parallel to the first battery cell to be turned off, and thus the processing module 19 can control the first battery cell to be connected to the energy storage unit. Conversely, when the third switch connected in series with the first battery cell is turned off and the fourth switch connected in parallel to the first battery cell is turned on, the processing module 19 can control the first battery cell to be disconnected from the energy storage unit.

[0051] In one example, as shown in FIG1 , for the first bridge arm 12a2, when the processing module 19 controls the first switch 12a1 and the second switch 12a3 to be turned on, the processing module 19 controls the third switch 12a22a to be turned off, the fourth switch 12a23a to be turned on, the third switch 12a22b to be turned off, the fourth switch 12a23b to be turned on, the third switch 12a22c to be turned on, and the fourth switch 12a23c to be turned off, thereby connecting the first battery cell 12a21c in the first bridge arm 12a2 to the energy storage module.

[0052] In this embodiment, by providing a third switch and a fourth switch for each first battery cell, the processing module 19 can select the first battery cell connected to the energy storage module.

[0053] In one embodiment of the present application, in order to connect an energy storage unit in the energy storage module to the battery pack, as shown in FIG1 , any energy storage unit includes: an energy storage subunit, a fifth switch, and a sixth switch, and the energy storage subunit is connected between the fifth switch and the sixth switch;

[0054] The processing module 19 is connected to the control ends of the fifth switch and the sixth switch.

[0055] It should be noted that, in the embodiment of the present application, the two energy storage units in the energy storage module 11 are respectively recorded as a first energy storage unit 111 and a second energy storage unit 112 .

[0056] The first energy storage unit 111 includes: a fifth switch 1111 , a first energy storage sub-unit, and a sixth switch 1113 . The second energy storage unit 112 specifically includes: a fifth switch 1121 , a second energy storage sub-unit, and a sixth switch 1123 .

[0057] In one example, the first energy storage subunit and the second energy storage subunit can be specifically a capacitor device or at least two capacitor devices connected in series. Figure 1 shows three capacitors connected in series as an example. The three capacitors in the first energy storage subunit are capacitor 1112a, capacitor 1112b, and capacitor 1112c, and the three capacitors in the second energy storage subunit are capacitor 1122a, capacitor 1122b, and capacitor 1122c.

[0058] In one embodiment of the present application, as shown in FIG2 , at least one battery pack further includes a second bridge arm, the second bridge arm includes a second battery cell, and the processing module 19 is further configured to control the second battery cell in the second bridge arm to be connected to the energy storage module.

[0059] It should be noted that Figure 2 is based on Figure 1, and the battery pack also includes: a second bridge arm 12a5, a second bridge arm 12b5, and a third bridge arm 12c5. Furthermore, the second bridge arm 12a5 includes a second battery cell 12a51a, a second battery cell 12a51b, a second battery cell 12a51c, and a second battery cell 12a51d. The second bridge arm 12b5 includes a second battery cell 12b51a, a second battery cell 12b51b, a second battery cell 12b51c, and a second battery cell 12b51d. The second bridge arm 12c5 includes a second battery cell 12c51a, a second battery cell 12c51b, and a second battery cell 12c51c.

[0060] In this embodiment, by providing the second bridge arm, the battery circuit can provide more bridge arms.

[0061] In one embodiment of the present application, as shown in FIG2 , the first bridge arm is connected in parallel at both ends of the energy storage module 11 , and the second bridge arm is connected in parallel at both ends of the energy storage module 11 .

[0062] In one embodiment of the present application, as shown in FIG2 , for at least one battery pack, further comprising: a ninth switch and a tenth switch, wherein the first end of the energy storage module 11, the ninth switch, the second bridge arm, the tenth switch, and the second end of the energy storage module 11 are connected in sequence;

[0063] The second bridge arm includes: at least two second battery cells connected in series;

[0064] The processing module 19 is connected to the control ends of the ninth switch and the tenth switch respectively, and is further configured to control at least one second battery cell in at least one battery pack to be connected to an energy storage unit in the energy storage module.

[0065] It should be noted that, taking FIG. 2 as an example, the battery pack 12a further includes a ninth switch 12a4 and a tenth switch 12a6, the battery pack 12b further includes a ninth switch 12b4 and a tenth switch 12b6, and the battery pack 12c further includes a ninth switch 12c4 and a tenth switch 12c6.

[0066] In this embodiment, by configuring the ninth and tenth switches, a corresponding second bridge arm can be provided in addition to the first bridge arm included in the battery pack. For example, for battery pack 12a, by configuring the ninth and tenth switches 12a4 and 12a6, a corresponding second bridge arm 12a5 is provided for the first bridge arm 12a2. This second bridge arm can then be connected in parallel across the energy storage module.

[0067] Furthermore, based on the principle of the function that can be achieved by the processing module 19 controlling the connection between at least one first battery cell in the first bridge arm and the energy storage module, the processing module 19 is used to control the connection between at least one second battery cell in at least one second bridge arm and the energy storage module by connecting the control ends of the ninth switch and the tenth switch, and can also achieve voltage balancing between the first battery cell and the second battery cell or between the second battery cells in the battery circuit.

[0068] In one embodiment of the present application, as shown in FIG3 , the battery circuit further includes a seventh switch 13 and an eighth switch 14 , wherein:

[0069] The first end of the energy storage module 11, the seventh switch 13, the second bridge arm, and the second end of the energy storage module 11 are connected in sequence;

[0070] The first end of the energy storage module 11, the first bridge arm, the eighth switch 14, and the second end of the energy storage module 11 are connected in sequence;

[0071] The processing module 19 is connected to the control terminals of the seventh switch 13 and the eighth switch 14 .

[0072] In the embodiment of the present application, the processing module 19 can control which first bridge arm and / or second bridge arm is connected to the energy storage module 11 by controlling the seventh switch 13 and the eighth switch 14 .

[0073] In one example, when the processing module 19 controls the first switch 12a1 , the second switch 12a3 and the eighth switch 14 to be turned on and other switches in the battery circuit are turned off, the processing module 19 controls the first bridge arm 12a2 to be connected to the energy storage module 11 .

[0074] When the processing module 19 controls the ninth switch 12a4, the tenth switch 12a6 and the seventh switch 13 to be turned on and other switches in the battery circuit are turned off, the processing module 19 controls the second bridge arm 12a5 to be connected to the energy storage module.

[0075] In one embodiment of the present application, as shown in FIG3 , the seventh switch 13 and the eighth switch 14 are connected in series;

[0076] The first bridge arm 12a2 and the second bridge arm 12a5 are connected in series;

[0077] The connection point between the seventh switch 13 and the eighth switch 14 is connected to the connection point between the first bridge arm 12a2 and the second bridge arm 12a5.

[0078] This embodiment can reduce the structural complexity of the battery circuit provided herein while controlling which of the first bridge arm and / or second bridge arm is connected to the energy storage module by controlling the seventh switch 13 and the eighth switch 14. Furthermore, by connecting the first bridge arm and the second bridge arm in series, more battery cells can be added to the battery pack.

[0079] In one embodiment of the present application, as shown in FIG3 , in order to enable the processing module 19 to control the connection between different second battery cells in the second bridge arm and the energy storage module 11 , the second bridge arm further includes: an eleventh switch and a twelfth switch, and any second battery cell is connected in series with the eleventh switch and then connected in parallel with the twelfth switch.

[0080] The processing module 19 is connected to the control terminals of the eleventh switch and the twelfth switch.

[0081] It should be noted that, based on FIG. 3 , the second battery cell 12a51a is connected in series with the eleventh switch 12a52a, and in parallel with the twelfth switch 12a53a. The second battery cell 12a51b is connected in series with the eleventh switch 12a52b, and in parallel with the twelfth switch 12a53b. The second battery cell 12a51c is connected in series with the eleventh switch 12a52c, and in parallel with the twelfth switch 12a53c. The second battery cell 12a51d is connected in series with the eleventh switch 12a52d, and in parallel with the twelfth switch 12a53d.

[0082] The second battery cell 12b51a is connected in series with the eleventh switch 12b52a, and the second battery cell 12b51a is connected in parallel with the twelfth switch 12b53a. The second battery cell 12b51b is connected in series with the eleventh switch 12b52b, and the second battery cell 12b51b is connected in parallel with the twelfth switch 12b53b. The second battery cell 12b51c is connected in series with the eleventh switch 12b52c, and the second battery cell 12b51c is connected in parallel with the twelfth switch 12b53c. The second battery cell 12b51d is connected in series with the eleventh switch 12b52d, and the second battery cell 12b51d is connected in parallel with the twelfth switch 12b53d.

[0083] The second battery cell 12c51a is connected in series with the eleventh switch 12c52a, and the second battery cell 12c51a is connected in parallel with the twelfth switch 12c53a. The second battery cell 12c51b is connected in series with the eleventh switch 12c52b, and the second battery cell 12c51b is connected in parallel with the twelfth switch 12c53b. The second battery cell 12c51c is connected in series with the eleventh switch 12c52c, and the second battery cell 12c51c is connected in parallel with the twelfth switch 12c53c. The second battery cell 12c51d is connected in series with the eleventh switch 12c52d, and the second battery cell 12c51c is connected in parallel with the twelfth switch 12c53d.

[0084] In the embodiment of the present application, for any second bridge arm, when the ninth and tenth switches corresponding to the second bridge arm are turned on, that is, when the second bridge arm is connected to the energy storage module, the processing module 19 can control the second battery cell to be connected to the energy storage module by controlling the eleventh switch connected in series with a second battery cell to be turned on and the twelfth switch connected in parallel to the second battery cell to be turned off. Conversely, when the eleventh switch connected in series with the second battery cell to be turned off and the twelfth switch connected in parallel to the second battery cell to be turned on, the processing module 19 can control the second battery cell to be disconnected from the energy storage module.

[0085] In one embodiment of the present application, as shown in any one of FIG. 1 to FIG. 3 , the battery circuit provided in the embodiment of the present application further includes: a discharge module 15 , wherein: the discharge module 15 is connected in parallel with the energy storage module 11 .

[0086] In this embodiment, when the battery circuit voltage is equalized, the energy storage module 11 is still charged. To prevent the energy storage module 11 from being charged, the processing module 19 uses the discharge module 15 to consume the energy in the energy storage module when the voltage is equalized to prevent the energy storage module from being charged.

[0087] In one embodiment of the present application, as shown in any one of FIG. 1 to FIG. 3 , the discharge module 15 includes: a thirteenth switch 151 , a fourteenth switch 153 and a discharge unit 152 , and the thirteenth switch 151 , the discharge unit 152 and the fourteenth switch 153 are connected in series in sequence.

[0088] The processing module 19 is connected to the control terminals of the thirteenth switch 151 and the fourteenth switch 153 , and is used to control whether the discharge unit is connected to the energy storage module 11 .

[0089] In this embodiment, when the battery circuit voltage is balanced, the processing module 19 controls the thirteenth switch 151 and the fourteenth switch 153 to be turned on, so that the energy storage module 11 is connected in parallel with the discharge unit 152 , and the discharge unit 152 consumes the electric energy of the energy storage module 11 .

[0090] Correspondingly, during the voltage balancing process of the battery circuit, the processing module 19 controls the thirteenth switch 151 and the fourteenth switch 153 to be disconnected, so that the energy storage module 11 is disconnected from the discharge unit 152 , and the discharge unit 152 does not consume the electric energy on the energy storage module 11 .

[0091] In one embodiment of the present application, in any of the above-described battery circuits, if a bridge arm in the battery pack is not charged, that bridge arm can be removed. For example, in the battery circuit shown in FIG3 , if the first bridge arm 12a2 is not charged, the first bridge arm 12a2, the first switch 12a1, and the second switch 12a3 can be removed, resulting in the battery circuit shown in FIG4 . Alternatively, if a battery cell is not charged, that battery cell can be removed.

[0092] Of course, a first bridge arm or a second bridge arm may be added, and switches may be provided at both ends of the bridge arm to connect to both ends of the energy storage module.

[0093] In combination with the above content, it can be seen that the battery circuit provided by the embodiment of the present application is highly flexible.

[0094] In practical applications, due to the limitations of battery cell energy and capacity, battery cells cannot meet the requirements of high-power loads. Therefore, battery cells are generally connected in series and parallel to form a battery pack.

[0095] However, during battery pack use, variations in initial capacity, equivalent series internal resistance, temperature, voltage, leakage current, and other parameters can occur between individual battery cells during the manufacturing process. These variations can lead to inconsistent charging and discharging behavior across the pack. This can manifest as overcharging or over-discharging of one or more individual battery cells. The effective capacity of a battery pack is determined by its weakest cell. Prolonged exposure to these abnormal charging and discharging conditions can exacerbate these inconsistencies, leading to reduced capacity and malfunction. This not only reduces the safety of the battery pack but also significantly shortens its lifespan.

[0096] Therefore, to achieve widespread application of large-capacity battery packs, it is necessary to perform voltage balancing control on each battery cell in the battery pack.

[0097] The present application provides a battery circuit 10, as shown in Figure 5, the battery circuit 10 includes an energy storage unit 11, at least one battery group 12 and a processing unit 19, wherein: for any group of battery groups 12, the battery group 12 is connected in parallel at both ends of the energy storage unit 11, and the battery group 12 includes a first bridge arm 122, and the first bridge arm 122 includes at least two first battery cells connected in series; the processing unit 19 is connected to the control end of the energy storage unit 11 and the control end of any first bridge arm, and is used to control at least one first battery cell in at least one first bridge arm 122 to be connected to the energy storage unit 11; wherein the rated voltages of different first battery cells are the same.

[0098] In this embodiment, FIG5 illustrates an example in which the battery circuit 10 includes a battery pack 12. The energy storage unit 11 is used to store and release electrical energy. In one example, the energy storage unit 11 can be a capacitor or at least two capacitors connected in series. FIG5 illustrates an example in which three capacitors are connected in series. The three capacitors in FIG5 are battery 11a, capacitor 11b, and capacitor 11c.

[0099] In the case where the at least one battery group 12 is at least two battery groups 12 , any battery group 12 is connected in parallel at both ends of the energy storage unit 11 .

[0100] For any battery pack 12, its first bridge arm 122 includes at least two first battery cells connected in series. FIG5 illustrates an example in which the first bridge arm 122 includes four first battery cells, specifically first battery cell 1221a, first battery cell 1221b, first battery cell 1221c, and first battery cell 1221d.

[0101] The processing unit 19 is connected to the control terminal of the energy storage unit and the control terminal of the battery pack, and is used to control at least one first battery cell in at least one battery pack to be connected to the energy storage unit. In one example, the processing unit 19 can be exemplarily an MCU.

[0102] Taking the example of processing unit 19 controlling the connection of two first battery cells in a battery pack to an energy storage unit, based on the above description, it can be seen that processing unit 19, by controlling the energy storage unit and any battery pack, controls the connection of two first battery cells in a first bridge arm to the energy storage unit. In this way, the two first battery cells in the first bridge arm charge the energy storage unit. As charging progresses, the voltages corresponding to the two first battery cells in the first bridge arm decrease, while the voltage across the energy storage unit increases. When the voltages corresponding to the two first battery cells in the first bridge arm equal the voltage across the energy storage unit, the two first battery cells in the first bridge arm stop charging the energy storage unit. Furthermore, processing unit 19, by controlling the energy storage unit and the first bridge arm, can release the stored energy in the energy storage unit to the other two first battery cells in the first bridge arm, or to the two first battery cells in another first bridge arm. This increases the voltages of the other two first battery cells in the first bridge arm, or to the two first battery cells in another first bridge arm. Based on this principle, voltage balancing between the first battery cells in the battery circuit provided in the embodiments of the present application can be achieved. This means that the battery circuit provided in the embodiment of the present application provides a hardware basis for voltage balancing control between battery cells.

[0103] It should be noted that the rated voltages of the first cells in the battery packs provided in the battery circuits of the present embodiment are the same. This is because the battery packs in the battery circuits of the present embodiment are manufactured with the same specifications for each cell. Based on this, voltage balancing can be achieved between the first cells using the same energy storage unit.

[0104] In summary, the embodiments of the present application provide a battery circuit comprising: an energy storage unit, at least one battery pack, and a processing unit 19, wherein: for any battery pack, the battery pack is connected in parallel across the energy storage unit, and the battery pack includes a first bridge arm, each of which includes at least two first battery cells connected in series; the processing unit 19 is connected to the control end of the energy storage unit and the control end of any first bridge arm, and is used to control the connection of at least one first battery cell in at least one first bridge arm to the energy storage unit; wherein the rated voltages of different first battery cells are the same. The battery circuit provided by the embodiments of the present application provides the hardware foundation for voltage balancing control between battery cells.

[0105] In one embodiment of the present application, in order to enable the processing unit 19 to control the connection between different battery packs and the energy storage unit, as shown in Figure 6, for any group of battery packs, it also includes: a first switch and a second switch, the first end of the energy storage unit, the first switch, the first bridge arm, the second switch and the second end of the energy storage unit are connected in sequence; the processing unit 19 is connected to the control ends of the first switch and the second switch.

[0106] It should be noted that in FIG. 6 , at least one battery pack includes three battery packs, namely, a battery pack 12 a , a battery pack 12 b , and a battery pack 12 c .

[0107] The battery pack 12a includes a first switch 12a1, a first bridge arm 12a2, and a second switch 12a3. The battery pack 12b includes a first switch 12b1, a first bridge arm 12b2, and a second switch 12b3. The battery pack 12c includes a first switch 12c1, a first bridge arm 12c2, and a second switch 12c3.

[0108] Furthermore, the first bridge arm 12a2 includes a first battery cell 12a21a, a first battery cell 12a21b, a first battery cell 12a21c, and a first battery cell 12a21d. The first bridge arm 12b2 includes a first battery cell 12b21a, a first battery cell 12b21b, a first battery cell 12b21c, and a first battery cell 12b21d. The first bridge arm 12c2 includes a first battery cell 12c21a, a first battery cell 12c21b, a first battery cell 12c21c, and a first battery cell 12c21d.

[0109] In this embodiment, for any battery pack, when the processing unit 19 controls the first switch and the second switch to be turned on, the processing unit 19 can control the battery pack to be connected to the energy storage unit. Conversely, when the processing unit 19 controls the first switch and the second switch to be turned off, the processing unit 19 can control the battery pack to be disconnected from the energy storage unit.

[0110] In one example, as shown in FIG6 , the processing unit 19 controls the first switch 12a1 and the second switch 12a3 to be turned on, and the processing unit 19 controls the battery pack 12a to be connected to the energy storage unit. The processing unit 19 controls the first switch 12c1 and the second switch 12c3 to be turned on, and the processing unit 19 controls the battery pack 12c to be connected to the energy storage unit.

[0111] In this embodiment, by providing a first switch and a second switch for each battery pack, the processing unit 19 can select the battery pack connected to the energy storage unit.

[0112] In one embodiment of the present application, in order to enable the processing unit 19 to control the connection between different first battery cells and the energy storage unit in the first bridge arm, as shown in FIG5 , the first bridge arm 122 further includes a third switch and a fourth switch, and any first battery cell is connected in series with the third switch and then in parallel with the fourth switch;

[0113] The processing unit 19 is connected to the control terminals of the third switch and the fourth switch.

[0114] 5 as an example, the first battery cell 1221a is connected in series with the third switch 1222a, and the first battery cell 1221a is connected in parallel with the fourth switch 1223a; the first battery cell 1221b is connected in series with the third switch 1222b, and the first battery cell 1221b is connected in parallel with the fourth switch 1223b; the first battery cell 1221c is connected in series with the third switch 1222c, and the first battery cell 1221c is connected in parallel with the fourth switch 1223c; the first battery cell 1221d is connected in series with the third switch 1222d, and the first battery cell 1221d is connected in parallel with the fourth switch 1223d.

[0115] In combination with the above embodiments, the battery circuit provided by the embodiments of the present application may also be shown in FIG6 . Taking FIG6 as an example, for the first bridge arm 12a2, the first battery cell 12a21a is connected in series with the third switch 12a22a, and the first battery cell 12a21a is connected in parallel with the fourth switch 12a23a. The first battery cell 12a21b is connected in series with the third switch 12a22b, and the first battery cell 12a21b is connected in parallel with the fourth switch 12a23b. The first battery cell 12a21c is connected in series with the third switch 12a22c, and the first battery cell 12a21c is connected in parallel with the fourth switch 12a23c. The first battery cell 12a21d is connected in series with the third switch 12a22d, and the first battery cell 12a21d is connected in parallel with the fourth switch 12a23d.

[0116] For the first bridge arm 12b2, the first battery cell 12b21a is connected in series with the third switch 12b22a, and in parallel with the fourth switch 12b23a. The first battery cell 12b21b is connected in series with the third switch 12b22b, and in parallel with the fourth switch 12b23b. The first battery cell 12b21c is connected in series with the third switch 12b22c, and in parallel with the fourth switch 12b23c. The first battery cell 12b21d is connected in series with the third switch 12b22d, and in parallel with the fourth switch 12b23d.

[0117] In the first bridge arm 12c2, the first battery cell 12c21a is connected in series with the third switch 12c22a, and in parallel with the fourth switch 12c23a. The first battery cell 12c21b is connected in series with the third switch 12c22b, and in parallel with the fourth switch 12c23b. The first battery cell 12c21c is connected in series with the third switch 12c22c, and in parallel with the fourth switch 12c23c. The first battery cell 12c21d is connected in series with the third switch 12c22d, and in parallel with the fourth switch 12c23d.

[0118] In this embodiment, for any first bridge arm, when the first switch and second switch corresponding to the first bridge arm are turned on, that is, when the first bridge arm is connected to the energy storage unit, the processing unit 19 controls the third switch connected in series with a first battery cell to be turned on and the fourth switch connected in parallel to the first battery cell to be turned off, and thus the processing unit 19 can control the first battery cell to be connected to the energy storage unit. Conversely, when the third switch connected in series with the first battery cell is turned off and the fourth switch connected in parallel to the first battery cell is turned on, the processing unit 19 can control the first battery cell to be disconnected from the energy storage unit.

[0119] In an example, as shown in Figure 6, for the first bridge arm 12a2, when the processing unit 19 controls the first switch 12a1 and the second switch 12a3 to be turned on, the processing unit 19 controls the third switch 12a22a to be turned off, the fourth switch 12a23a to be turned on, the third switch 12a22b to be turned off, the fourth switch 12a23b to be turned on, the third switch 12a22c to be turned on, the fourth switch 12a23c to be turned off, the third switch 12a22d to be turned on and the fourth switch 12a23d to be turned off, so that the first battery cell 12a21c and the first battery cell 12a21d in the first bridge arm 12a2 can be connected to the energy storage unit.

[0120] In this embodiment, by providing a third switch and a fourth switch for each first battery cell, the processing unit 19 can select the first battery cell connected to the energy storage unit.

[0121] In one embodiment of the present application, as shown in FIG7 , at least one battery pack further includes a second bridge arm, the second bridge arm includes a second battery cell, and the processing unit 19 is further configured to control the second battery cell in the second bridge arm to be connected to the energy storage unit.

[0122] It should be noted that Figure 7 is based on Figure 6, and the battery pack further includes: a second bridge arm 12a5, a second bridge arm 12b5, and a third bridge arm 12c5. Furthermore, the second bridge arm 12a5 includes a second battery cell 12a51a, a second battery cell 12a51b, a second battery cell 12a51c, and a second battery cell 12a51d. The second bridge arm 12b5 includes a second battery cell 12b51a, a second battery cell 12b51b, a second battery cell 12b51c, and a second battery cell 12b51d. The second bridge arm 12c5 includes a second battery cell 12c51a, a second battery cell 12c51b, a second battery cell 12c51c, and a second battery cell 12c51d.

[0123] In this embodiment, by providing the second bridge arm, the battery circuit can provide more bridge arms.

[0124] In one embodiment of the present application, as shown in FIG6 to FIG9 , the first bridge arm is connected in parallel at both ends of the energy storage unit 11 , and the second bridge arm is connected in parallel at both ends of the energy storage unit 11 .

[0125] In one embodiment of the present application, as shown in FIG7 , at least one battery pack further includes: a seventh switch and an eighth switch, wherein the first end of the energy storage unit, the seventh switch, the second bridge arm, the eighth switch, and the second end of the energy storage unit are connected in sequence;

[0126] The second bridge arm includes at least two second battery cells connected in series;

[0127] The processing unit 19 is connected to the control ends of the seventh switch and the eighth switch, and is further configured to control at least one second battery cell in at least one second bridge arm to be connected to the energy storage unit.

[0128] It should be noted that FIG7 is based on FIG6 . For battery pack 12a, it further includes a seventh switch 12a4 and an eighth switch 12a6. For battery pack 12b, it further includes a seventh switch 12b4 and an eighth switch 12b6. For battery pack 12c, it further includes a seventh switch 12c4 and an eighth switch 12c6.

[0129] In this embodiment, by configuring the seventh and eighth switches, a corresponding second bridge arm can be provided in addition to the first bridge arm of the battery pack. For example, for battery pack 12a, by configuring the seventh and eighth switches 12a4 and 12a6, a corresponding second bridge arm 12a5 is provided for the first bridge arm 12a2. The second bridge arm 12a5 can then be connected in parallel across the energy storage unit.

[0130] Furthermore, based on the principle of the function that can be achieved by the processing unit 19 controlling the connection between at least one first battery cell and the energy storage unit in the first bridge arm, the processing unit 19 is used to control at least one second battery cell and the energy storage unit in at least one second bridge arm by connecting the control ends of the seventh switch and the eighth switch, and can also achieve voltage balance between the first battery cell and the second battery cell or between the second battery cells in the battery circuit.

[0131] In one embodiment of the present application, as shown in Figure 8, the battery circuit 10 further includes a fifth switch 13 and a sixth switch 14, wherein: the first end of the energy storage unit 11, the fifth switch 13, the second bridge arm, and the second end of the energy storage unit 11 are connected in sequence; the first end of the energy storage unit 11, the first bridge arm, the sixth switch 14, and the second end of the energy storage unit 11 are connected in sequence; and the processing unit 19 is connected to the control ends of the fifth switch 13 and the sixth switch 14.

[0132] In the embodiment of the present application, the processing unit 19 can control which first bridge arm and / or second bridge arm is connected to the energy storage unit by controlling the fifth switch 13 and the sixth switch 14 .

[0133] In one example, when the processing unit 19 controls the first switch 12a1 , the second switch 12a3 and the sixth switch 14 to be turned on and other switches in the battery circuit are turned off, the processing unit 19 controls the first bridge arm 12a2 to be connected to the energy storage unit.

[0134] When the processing unit 19 controls the seventh switch 12a4, the eighth switch 12a6 and the fifth switch 13 to be turned on and other switches in the battery circuit are turned off, the processing unit 19 controls the second bridge arm 12a5 to be connected to the energy storage unit.

[0135] In one embodiment of the present application, as shown in FIG8 , the fifth switch 13 and the sixth switch 14 are connected in series; the first bridge arm and the second bridge arm are connected in series; and the connection point between the fifth switch 13 and the sixth switch 14 is connected to the connection point between the first bridge arm 12a2 and the second bridge arm 12a5.

[0136] This embodiment can reduce the structural complexity of the battery circuit provided herein while controlling which of the first bridge arm and / or second bridge arm is connected to the energy storage unit by controlling the fifth switch 13 and the sixth switch 14. Furthermore, by connecting the first bridge arm and the second bridge arm in series, more battery cells can be added to the battery pack.

[0137] In one embodiment of the present application, in order to enable the processing unit 19 to control the connection between different second battery cells and energy storage units in the second bridge arm, as shown in Figure 7 or Figure 8, the second bridge arm also includes: a ninth switch and a tenth switch, any second battery cell is connected in series with the ninth switch and then connected in parallel with the tenth switch; the processing unit 19 is connected to the control ends of the ninth switch and the tenth switch.

[0138] It should be noted that, based on Figure 7 or Figure 8, the second battery cell 12a51a is connected in series with the ninth switch 12a52a, and in parallel with the tenth switch 12a53a. The second battery cell 12a51b is connected in series with the ninth switch 12a52b, and in parallel with the tenth switch 12a53b. The second battery cell 12a51c is connected in series with the ninth switch 12a52c, and in parallel with the tenth switch 12a53c. The second battery cell 12a51d is connected in series with the ninth switch 12a52d, and in parallel with the tenth switch 12a53d.

[0139] Second battery cell 12b51a is connected in series with ninth switch 12b52a, and in parallel with tenth switch 12b53a. Second battery cell 12b51b is connected in series with ninth switch 12b52b, and in parallel with tenth switch 12b53b. Second battery cell 12b51c is connected in series with ninth switch 12b52c, and in parallel with tenth switch 12b53c. Second battery cell 12b51d is connected in series with ninth switch 12b52d, and in parallel with tenth switch 12b53d.

[0140] The second battery cell 12c51a is connected in series with the ninth switch 12c52a, and in parallel with the tenth switch 12c53a. The second battery cell 12c51b is connected in series with the ninth switch 12c52b, and in parallel with the tenth switch 12c53b. The second battery cell 12c51c is connected in series with the ninth switch 12c52c, and in parallel with the tenth switch 12c53c. The second battery cell 12c51d is connected in series with the ninth switch 12c52d, and in parallel with the tenth switch 12c53d.

[0141] In the embodiment of the present application, for any second bridge arm, when the seventh and eighth switches corresponding to the second bridge arm are turned on, that is, when the second bridge arm is connected to the energy storage unit, the processing unit 19 controls the ninth switch connected in series with a second battery cell to be turned on and the tenth switch connected in parallel to the second battery cell to be turned off, and the processing unit 19 can control the second battery cell to be connected to the energy storage unit. Conversely, when the ninth switch connected in series with the second battery cell is turned off and the tenth switch connected in parallel to the second battery cell is turned on, the processing unit 19 can control the second battery cell to be disconnected from the energy storage unit.

[0142] On the basis of any of the above embodiments, the battery circuit 10 provided in the embodiment of the present application further includes a discharge unit 15 as shown in Figures 5 to 8 , wherein the discharge unit 15 is connected in parallel with the energy storage unit 11 .

[0143] In one embodiment, the discharge unit 15 may be specifically a resistor or other energy-consuming components.

[0144] In this embodiment, when the battery circuit voltage is equalized, the energy storage unit 11 is still charged. To prevent the energy storage unit 11 from being charged, the processing unit 19 uses the discharge unit 15 to consume the energy in the energy storage unit when the voltage is equalized to prevent the energy storage unit from being charged.

[0145] In one embodiment of the present application, the battery circuit provided in the embodiment of the present application further includes: an eleventh switch 16 and a twelfth switch 17. The first end of the energy storage unit 11, the eleventh switch 16, the discharge unit 15, the twelfth switch 17, and the second end of the energy storage unit 11 are connected in sequence; and the processing unit 19 is connected to the control ends of the eleventh switch 16 and the twelfth switch 17 to control whether the discharge unit 15 is connected to the energy storage unit 11.

[0146] In this embodiment, when the battery circuit voltage is balanced, the processing unit 19 controls the eleventh switch 16 and the twelfth switch 17 to be turned on, so that the energy storage unit 11 is connected in parallel with the discharge unit 15 , and the discharge unit 15 consumes the electric energy of the energy storage unit 11 .

[0147] Correspondingly, during the voltage balancing process of the battery circuit, the processing unit 19 controls the eleventh switch 16 and the twelfth switch 17 to be disconnected, so that the energy storage unit 11 is disconnected from the discharge unit 15 , and the discharge unit 15 does not consume the electric energy on the energy storage unit 11 .

[0148] In one embodiment of the present application, in any of the above-described battery circuits, if a bridge arm in the battery pack is not charged, that bridge arm can be removed. For example, in the battery circuit shown in FIG8 , if the first bridge arm 12a2 is not charged, the first bridge arm 12a2, the first switch 12a1, and the second switch 12a3 can be removed, resulting in the battery circuit shown in FIG9 . Alternatively, if a battery cell is not charged, that battery cell can be removed.

[0149] Of course, a first bridge arm or a second bridge arm may be added, and corresponding switches may be provided at both ends of the bridge arm to connect to both ends of the energy storage unit.

[0150] In combination with the above content, it can be seen that the battery circuit provided by the embodiment of the present application is highly flexible.

[0151] <Battery Circuit Control Method Example>

[0152] This application also provides a method for controlling a battery circuit, wherein the battery circuit includes an energy storage module and a battery pack, wherein the energy storage module includes two parallel-connected energy storage units, and the battery pack includes a bridge arm, each of which includes at least two series-connected battery cells. The battery circuit can be any of the battery circuits described in the aforementioned battery circuit embodiments.

[0153] As shown in FIG10 , the battery circuit control method provided in the embodiment of the present application includes the following steps S51 to S53 .

[0154] Step S51 : When a voltage balance condition in a bridge arm is satisfied, controlling num1 first discharge battery cells in a first target bridge arm to charge a first target energy storage unit in an energy storage module.

[0155] In this embodiment, the voltage balancing condition within the bridge arm refers to a condition requiring voltage balancing within the bridge arm.

[0156] The first target bridge arm can be any bridge arm in at least one battery pack for which voltage equalization between battery cells within the bridge arm is required. The first target bridge arm can be a first bridge arm or a second bridge arm. When the first target bridge arm is the first bridge arm, the battery cells within the bridge arm are specifically first battery cells. When the first target bridge arm is the second bridge arm, the battery cells within the bridge arm are specifically second battery cells.

[0157] In this embodiment, the battery cell in the first target bridge arm that charges the energy storage module is recorded as the first discharging battery cell.

[0158] In one example, the bridge arm with the maximum voltage difference between battery cells greater than a first preset threshold can be selected as the first target bridge arm. The first preset threshold is the maximum allowable voltage deviation between battery cells within the bridge arm when the battery cell voltages are balanced. The first preset threshold can be set based on experience. Of course, it can also be determined by other methods, such as manually specified.

[0159] In one embodiment of the present application, the num1 first discharge battery cells in the first target bridge arm are the first discharge battery cells in the first target bridge arm that are located at the front num1 when the voltage across the first discharge battery cells is sorted from highest to lowest. Based on this, it can be seen that the aforementioned num1 first discharge battery cells are the battery cells with high voltage in the first target bridge arm.

[0160] The processing module controls the num1 first discharge battery cells in the first target bridge arm to be connected to the first target energy storage unit to control the num1 first discharge battery cells in the first target bridge arm to charge the first target energy storage unit.

[0161] Among them, the specific implementation method of controlling the connection between the num1 first discharge battery cells in the first target bridge arm and the first target energy storage unit can be: controlling the switches at both ends of the first target bridge arm to be turned on, and controlling the switches connected in series with the num1 first discharge battery cells in the first target bridge arm to be turned on, controlling the switches connected in parallel with the battery cells other than the num1 first discharge battery cells in the first target bridge arm to be turned on, and controlling the fifth switch and the sixth switch corresponding to the first target energy storage unit to be turned on, while disconnecting the other switches.

[0162] When the num1 first discharge battery cells in the first target bridge arm charge the first target energy storage unit, the voltages across the num1 first discharge battery cells in the first target bridge arm decrease.

[0163] It should be noted that the first target energy storage unit is a different energy storage unit in the energy storage module than the one used in the previous voltage equalization. This is because the battery pack in the battery circuit controlled by this method is obtained by reassembling retired single cells, and the voltages across different battery packs are not exactly the same. Thus, the maximum voltage across the energy storage unit used in the previous voltage equalization, when in operation, may not be the same as the maximum voltage across the energy storage unit used in this voltage equalization. If they are different, the energy storage unit used in the previous voltage equalization cannot be used in this voltage equalization. Therefore, in this embodiment, different energy storage units in the energy storage module must be used during two consecutive voltage equalization processes.

[0164] Step S52 : when the voltage of the first target energy storage unit is the same as the voltage across the num1 first discharge battery cells, control the num1 first discharge battery cells in the first target bridge arm to stop charging the first target energy storage unit.

[0165] Step S53 , controlling the first target energy storage unit to charge num2 first rechargeable battery cells in the first target bridge arm.

[0166] In this embodiment, the num2 first rechargeable battery cells in the first target bridge arm are the first num2 battery cells in the first target bridge arm when the battery cells are sorted in ascending order of voltage across the battery cells. Based on this, it can be seen that the num2 first rechargeable battery cells in the first target bridge arm are the battery cells with the lowest voltage in the first target bridge arm. num1 and num2 may be the same or different.

[0167] When the voltage of the first target energy storage unit is the same as the voltage across the num1 first discharge battery cells, the first target energy storage unit is disconnected from the num1 first discharge battery cells, thereby controlling the num1 first discharge battery cells in the first target bridge arm to stop charging the first target energy storage unit. At this point, the voltage across the first target energy storage unit is greater than the voltage across the num2 first rechargeable battery cells in the first target bridge arm, meaning that there is a potential difference between the first target energy storage unit and the num2 first rechargeable battery cells in the first target bridge arm. Disconnecting the first target energy storage unit from the num1 first discharge battery cells can be accomplished by disconnecting all switches.

[0168] Furthermore, by controlling the num2 first rechargeable battery cells in the first target bridge arm to be connected to the first target energy storage unit, the first target energy storage unit charges the num2 first rechargeable battery cells in the first target bridge arm based on the potential difference.

[0169] Among them, the method of controlling the connection between the num2 first rechargeable battery cells in the first target bridge arm and the first target energy storage unit can be: controlling the switches connected in series with the num2 first rechargeable battery cells in the first target bridge arm to be turned on, and the switches connected in parallel with the battery cells other than the num2 first rechargeable battery cells in the first target bridge arm to be turned on, and the fifth switch and the sixth switch corresponding to the first target energy storage unit to be turned on, and the other switches to be disconnected.

[0170] When the first target energy storage unit charges the num2 first rechargeable battery cells in the first target bridge arm, the voltages of the num2 first rechargeable battery cells in the first target bridge arm increase, thereby achieving voltage balance within the bridge arm.

[0171] In one embodiment of the present application, the control method of the battery circuit provided in the embodiment of the present application further includes the following step S54.

[0172] In step S54, when the voltage of the first target energy storage unit is the same as the voltage across the num2 first charging battery cells, repeatedly controlling the num1 first discharging battery cells in the first target bridge arm to charge the first target energy storage unit until the voltage difference between the voltage across the num1 first discharging battery cells and the voltage across the num2 first charging battery cells is less than or equal to a first preset threshold.

[0173] In this embodiment, when the voltage of the first target energy storage unit is the same as the voltage across the num2 first rechargeable battery cells, the potential difference between the first target energy storage unit and the num2 first rechargeable battery cells is zero. Therefore, the first target energy storage unit cannot charge the num2 first rechargeable battery cells. In this case, step S51 is repeated to control the num1 first discharge battery cells in the first target bridge arm to continue charging the first target energy storage unit, and the first target energy storage unit to continue charging the num2 first rechargeable battery cells in the first target bridge arm.

[0174] When the voltage difference between the voltage across the num1 first discharging battery cells and the voltage across the num2 first charging battery cells is less than or equal to the first preset threshold, the voltages between the battery cells in the first target bridge arm are balanced.

[0175] Based on this embodiment, voltage balancing among battery cells in the first bridge arm can be achieved.

[0176] In one embodiment of the present application, there are n battery cells in the first target bridge arm, num1 is the same as num2, and when n is an even number, num1≤n / 2; when n is an odd number, num1≤(n+1) / 2.

[0177] In this embodiment, based on the above limitation, it is possible to avoid the same battery cell in the first target bridge arm being used as both the first discharging battery cell and the first charging battery cell.

[0178] In one example, based on the battery circuit example shown in FIG3 , if the first target bridge arm is the first bridge arm 12b2, the first discharging battery cells are the first battery cells 12b21a and 12b21d, respectively, the first charging battery cells are the first battery cells 12b21b and 12b21c, respectively, and the first target energy storage unit is energy storage unit 112, then, based on steps S51 to S54 above, the first switch 12b1, the second switch 12b3, the third switch 12b22a, the fourth switch 12b23b, the fourth switch 12b23c, the third switch 12b22d, the fifth switch 1121, and the sixth switch 1123 are controlled to be turned on, while the remaining switches are turned off; at this point, the first battery cells 12b21a and 12b21d charge the second energy storage unit 112.

[0179] When the voltage across the second energy storage unit 112 is the same as the voltage across the first battery cell 12b21a and the first battery cell 12b21d connected in series, all switches are turned off. At this time, the num1 first discharge battery cells in the first target bridge arm stop charging the second energy storage unit 112; and the first switch 12b1, the second switch 12b3, the fourth switch 12b23a, the third switch 12b22b, the third switch 12b22c, and the fourth switch 12b23d are controlled to be turned on, and the remaining switches are turned off; at this time, the second energy storage unit 112 charges the num2 first charge battery cells.

[0180] When the voltage of the second energy storage unit 112 is equal to the voltage across the first battery cell 12b21b and the first battery cell 12b21c connected in series, the third switch 12b22a, the fourth switch 12b23b, the fourth switch 12b23c, and the third switch 12b22d are turned on again, and the fourth switch 12b23a, the third switch 12b22b, the third switch 12b22c, and the fourth switch 12b23d are turned off, until the voltage difference across the first battery cell 12b21a and the first battery cell 12b21d connected in series and the voltage difference across the first battery cell 12b21b and the first battery cell 12b21c connected in series is less than or equal to a first preset threshold.

[0181] In one embodiment of the present application, the battery circuit further includes a discharge module. On this basis, the control method of the battery circuit provided in the embodiment of the present application further includes the following steps S55 and S56.

[0182] Step S55 : When the voltage difference between the voltage across the num1 first discharging battery cells and the voltage across the num2 first charging battery cells is less than or equal to a first preset threshold, controlling the discharging module to connect to the first target energy storage unit.

[0183] In this embodiment, when the voltage difference between the voltage across the num1 first discharging battery cells and the voltage across the num2 first charging battery cells is less than or equal to a first preset threshold, it indicates that the voltage within the first target bridge arm is balanced. At this point, the discharge module is controlled to connect to the first target energy storage unit. At this point, the discharge module consumes the electrical energy in the first target energy storage unit, thereby preventing the first target energy storage unit from becoming charged. Controlling the connection between the discharge module and the first target energy storage unit can be accomplished by controlling the conduction of the thirteenth switch 151 and the fourteenth switch 153 in the discharge module in the battery circuit shown in Figures 1 to 3.

[0184] Step S56 : when the voltage difference between the voltage across the num1 first discharging battery cells and the voltage across the num2 first charging battery cells is greater than a first preset threshold, control the discharging module to disconnect from the first target energy storage unit.

[0185] Corresponding to step S56 above, if the voltage difference between the voltage across the num1 first discharging battery cells and the voltage across the num2 first charging battery cells is greater than the first preset threshold, it indicates that the voltage within the bridge arm is not yet balanced. At this point, the first target energy storage unit still needs to be charged. At this point, the discharge module is controlled to disconnect from the first target energy storage unit.

[0186] The method of controlling the discharge module to be disconnected from the first target energy storage unit may be to control the thirteenth switch 151 and the fourteenth switch 153 in the discharge module in the battery circuit shown in FIG. 1 to FIG. 3 to be disconnected.

[0187] In one embodiment of the present application, the control method of the battery circuit provided in the embodiment of the present application further includes the following steps S57 to S59.

[0188] Step S57 : When the voltage balance condition between the bridge arms is met, control the num4 second discharge battery cells in the num3 second target bridge arms to charge the second target energy storage unit.

[0189] The second target energy storage unit is an energy storage unit in the energy storage module that is different from the energy storage unit used for the previous voltage balancing.

[0190] In this embodiment, the voltage balancing condition between bridge arms refers to a condition requiring voltage balancing between bridge arms.

[0191] The second target bridge arm refers to any bridge arm with a high voltage that requires voltage balancing between bridge arms.

[0192] Based on the example shown in FIG3 , voltage balancing between bridge arms may specifically be voltage balancing between first bridge arms, voltage balancing between second bridge arms, or voltage balancing between the first bridge arm and the second bridge arm.

[0193] In one embodiment of the present application, the num3 second target bridge arms are the bridge arms that are located in the first num3 positions when the voltages across the bridge arms are sorted from large to small. num3 is an integer greater than 0.

[0194] The num4 second discharge battery cells are the first num4 battery cells in the num3 second target bridge arms when the voltages of the battery cells are sorted from large to small. Based on this, it can be seen that the num4 second discharge battery cells are the battery cells with high voltages in the num3 second target bridge arms.

[0195] By controlling the num4 second discharge battery cells in the num3 second target bridge arms to be connected to the second target energy storage unit, the num4 second discharge battery cells in the num3 second target bridge arms can charge the energy storage unit.

[0196] When the num4 second discharge battery cells charge the second target energy storage unit, the voltages across the num4 second discharge battery cells decrease.

[0197] Step S58 , when the voltage of the second target energy storage unit is the same as the voltage across the num4 second discharge battery cells, control the num4 second discharge battery cells to stop charging the second target energy storage unit.

[0198] Step S59 , controlling the second target energy storage unit to charge the num6 second rechargeable battery cells in the num5 third target bridge arms.

[0199] In this embodiment, the third target bridge arm refers to any bridge arm with a low voltage that requires voltage balancing between bridge arms. The third target bridge arm may be the first bridge arm or the second bridge arm.

[0200] In one embodiment of the present application, the num5 third target bridge arms are the bridge arms located at the front num5 when the voltages at both ends of the bridge arms are sorted from small to large.

[0201] The num6 second rechargeable battery cells are the first num6 battery cells in the num5 third target bridge arms when the voltage across the battery cells is sorted from smallest to largest. Based on this, it can be seen that the num6 second rechargeable battery cells are the battery cells with low voltage in the num5 third target bridge arms.

[0202] The num4 second discharge battery cells can be controlled to be disconnected from the second target energy storage unit so that the num4 second discharge battery cells stop charging the second target energy storage unit. Also, the num6 second charge battery cells can be controlled to be connected to the second target energy storage unit so that the second target energy storage unit charges the num6 second charge battery cells.

[0203] When the voltage of the second target energy storage unit is the same as the voltage across the num4 second discharge battery cells, the num4 second discharge battery cells are controlled to stop charging the second target energy storage unit. At this time, the voltage across the second target energy storage unit is greater than the voltage across the num6 second charge battery cells, that is, there is a potential difference between the second target energy storage unit and the num6 second charge battery cells.

[0204] Further, the energy storage unit is controlled to be connected to the num6 second rechargeable battery cells, and the energy storage unit charges the num6 second rechargeable battery cells based on the potential difference to achieve the second target.

[0205] When the second target energy storage unit charges num6 second rechargeable battery cells, the voltages of the num6 second rechargeable battery cells increase, thereby achieving voltage balance between the bridge arms.

[0206] It should be noted that, in the above embodiment, num3 and num5 may be the same or different. Similarly, num4 and num6 may be the same or different.

[0207] Based on the above-mentioned embodiment of steps S57 to S59, the control method of the battery circuit provided in the embodiment of the present application further includes the following step S510.

[0208] In step S510, when the voltage of the second target energy storage unit is the same as the voltage across the num6 second charging battery cells, repeatedly controlling the num4 second discharging battery cells to charge the second target energy storage unit until the voltage difference between the voltage across the num4 second discharging battery cells and the voltage across the num6 second charging battery cells is less than or equal to a second preset threshold.

[0209] The second preset threshold is a maximum allowable voltage deviation between the bridge arms of the battery circuit when the voltages between the bridge arms are balanced.

[0210] It should be noted that the specific implementation of the above step S510 is similar to the specific implementation of the above step S54, and will not be repeated here.

[0211] In one embodiment of the present application, the battery circuit further includes a discharge unit. On this basis, the control method of the battery circuit provided in the embodiment of the present application further includes the following steps S511 and S512.

[0212] Step S511 , when the voltage difference between the voltage across num4 second discharging battery cells and the voltage across num6 second charging battery cells is less than or equal to a second preset threshold, controlling the discharging unit to connect to the second target energy storage unit.

[0213] Step 512 : When the voltage difference between the voltage across the num4 second discharging battery cells and the voltage across the num6 second charging battery cells is greater than a second preset threshold, control the discharging unit to disconnect from the second target energy storage unit.

[0214] It should be noted that the specific implementation of the above step S511 is similar to the specific implementation of the above step S55, and the specific implementation of the above step S512 is similar to the specific implementation of the above step S56, which will not be repeated here.

[0215] In one example, based on the example shown in FIG3 , if num3 and num5 are 1, num4 and num6 are 2, the second target bridge arm is the first bridge arm 12b2, the second discharge battery cells are the first battery cells 12b21a and 12b21d, the third target bridge arm is the second bridge arm 12a5, the second rechargeable battery cells are the second battery cells 12a51a and 12a51d, and the second target energy storage unit is the first energy storage unit 111. In this case, based on steps S57 to S510 above, the first switch 12b1, the second switch 12b3, the third switch 12b22a, the fourth switch 12b23b, the fourth switch 12b23c, the third switch 12b22d, the sixth switch 14, the fifth switch 1111, and the sixth switch 1113 are controlled to be turned on, and the remaining switches are turned off. At this point, num2 second rechargeable battery cells charge the first energy storage unit 111.

[0216] When the voltage across the first energy storage unit 111 is equal to the voltage across the num4 second discharge cells connected in series, all switches are controlled to be disconnected. At this point, the num4 second discharge cells stop charging the first energy storage unit 111. Furthermore, the seventh switch 13, the ninth switch 12a4, the tenth switch 12a6, the eleventh switch 12a52a, the twelfth switch 12a53b, the twelfth switch 12a53c, the eleventh switch 12a52d, the fifth switch 1111, and the sixth switch 1113 are controlled to be turned on, while the remaining switches are turned off. At this point, the first energy storage unit 111 charges the num6 second rechargeable battery cells.

[0217] When the voltage of the first energy storage unit 111 is equal to the voltage across the second battery cell 12a51a and the second battery cell 12a51d connected in series, the first switch 12b1, the second switch 12b3, the third switch 12b22a, the fourth switch 12b23b, the fourth switch 12b23c, the third switch 12b22d, the sixth switch 14, the fifth switch 1111, and the sixth switch 1113 are turned on again, and the remaining switches are turned off. This continues until the voltage across the num4 second discharging battery cells and the num6 second charging battery cells falls below a second preset threshold.

[0218] In another example, based on the example shown in Figure 3, if num3 and num5 are both 2, num4 and num6 are 4, and the second target bridge arm is the first bridge arm 12c2 and the second bridge arm 12c5, the third target bridge arm is the first bridge arm 12b2 and the second bridge arm 12a5, the second discharging battery cells are the first battery cell 12c21b, the first battery cell 12c21c, the second battery cell 12c51b, and the second battery cell 12c51c, the second charging battery cells are the first battery cell 12b21a, the first battery cell 12b21d, the second battery cell 12a51a, and the second battery cell 12a51d, and the second target energy storage unit is the first energy storage unit 111. At this point, based on steps S57 to S59 above, the first switch 12c1, the second switch 12c3, the fourth switch 12c23a, the third switch 12c22b, the third switch 12c22c, the fourth switch 12c23d, the ninth switch 12c4, the tenth switch 12c6, the tenth switch 12c53a, the eleventh switch 12c52b, the eleventh switch 12c52c, the twelfth switch 12c53d, the fifth switch 1111, and the sixth switch 1113 are controlled to be turned on, and the remaining switches are turned off. At this point, the num4 second rechargeable battery cells are charging the first energy storage unit 111.

[0219] When the voltage across the first energy storage unit 111 is the same as the voltage across the num4 second discharge battery cells connected in series, all switches are controlled to be disconnected; at this time, the num4 second discharge battery cells stop charging the first energy storage unit 111; and the first switch 12b1, the second switch 12b3, the third switch 12b22a, the fourth switch 12b23b, the fourth switch 12b23c, the third switch 12b22d, the ninth switch 12a4, the tenth switch 12a5, the eleventh switch 12a52a, the twelfth switch 12a53b, the twelfth switch 12a53c, the eleventh switch 12a52d, the fifth switch 1111, and the sixth switch 1113 are controlled to be turned on; at this time, the first energy storage unit 111 charges the num6 second rechargeable battery cells.

[0220] Furthermore, when the voltage of the first energy storage unit 111 is the same as the voltage across the first battery cell 12b21a, the first battery cell 12b21d, the second battery cell 12a51a, and the second battery cell 12a51d connected in series, the first switch 12c1, the second switch 12c3, the fourth switch 12c23a, the third switch 12c22b, the third switch 12c22c, the fourth switch 12c23d, the ninth switch 12c4, the tenth switch 12c6, the tenth switch 12c53a, the eleventh switch 12c52b, the eleventh switch 12c52c, the twelfth switch 12c53d, the fifth switch 1111, and the sixth switch 1113 are turned on again, and the remaining switches are turned off; until the voltage across the num4 second discharge battery cells and the num6 second rechargeable battery cells is less than the second preset threshold.

[0221] In one embodiment of the present application, the control method of the battery circuit provided in the embodiment of the present application further includes the following steps S513 to S515.

[0222] Step S513: Obtain voltage balancing type.

[0223] In one embodiment of the present application, the above step S513 can be specifically implemented in the following two ways.

[0224] The first method is to manually input the voltage balancing type. Specifically, the technician determines the voltage balancing type based on the test results of each battery cell in the battery circuit.

[0225] The second method is to establish a rule and use it to determine the voltage balancing type. The rule could be: if the voltage difference between battery cells in a bridge arm is greater than a first preset threshold, the voltage balancing type is determined to be intra-arm voltage balancing, and that bridge arm is used as the first target bridge arm. If the voltage difference between at least one bridge arm and at least one other bridge arm is greater than a second preset threshold, the voltage balancing type is determined to be inter-arm voltage balancing. It should be noted that this rule can be set by technical personnel based on experience.

[0226] Step S514 : When the voltage balancing type is voltage balancing within the bridge arm, it is determined whether a voltage balancing condition within the bridge arm is satisfied.

[0227] Step S515 : When the voltage balancing type is inter-bridge-arm voltage balancing, determining whether an inter-bridge-arm voltage balancing condition is satisfied.

[0228] The present application also provides a control method for a battery circuit, wherein the battery circuit includes: an energy storage unit, a battery pack, the battery pack including a bridge arm, and the bridge arm including at least two battery cells connected in series. The battery circuit can be specifically any of the battery circuits in the above battery circuit embodiments.

[0229] As shown in FIG11 , the battery circuit control method provided in the embodiment of the present application includes the following steps S61 to S63:

[0230] Step S61 : When a voltage balance condition in the bridge arm is satisfied, control num1 first discharge battery cells in the first target bridge arm to charge the energy storage unit.

[0231] In this embodiment, the voltage balancing condition within the bridge arm refers to a condition requiring voltage balancing within the bridge arm.

[0232] The first target bridge arm can be any bridge arm in at least one battery pack for which voltage equalization between battery cells within the bridge arm is required. The first target bridge arm can be a first bridge arm or a second bridge arm. When the first target bridge arm is the first bridge arm, the battery cells within the bridge arm are specifically first battery cells. When the first target bridge arm is the second bridge arm, the battery cells within the bridge arm are specifically second battery cells.

[0233] In this embodiment, the battery cell in the first target bridge arm that charges the energy storage unit is recorded as a first discharging battery cell.

[0234] In one example, the bridge arm with the maximum voltage difference between battery cells greater than a first preset threshold can be selected as the first target bridge arm. The first preset threshold is the maximum allowable voltage deviation between battery cells within the bridge arm when the battery cell voltages are balanced. The first preset threshold can be set based on experience. Of course, it can also be determined by other methods, such as manually specified.

[0235] In one embodiment of the present application, the num1 first discharge battery cells in the first target bridge arm are the first discharge battery cells in the first target bridge arm that are located at the front num1 when the voltage across the first discharge battery cells is sorted from highest to lowest. Based on this, it can be seen that the aforementioned num1 first discharge battery cells are the battery cells with high voltage in the first target bridge arm.

[0236] By controlling the num1 first discharge battery cells in the first target bridge arm to be connected to the energy storage unit, the num1 first discharge battery cells in the first target bridge arm are controlled to charge the energy storage unit.

[0237] Among them, the specific implementation method of controlling the connection between the num1 first discharge battery cells in the first target bridge arm and the energy storage unit can be: controlling the switches at both ends of the first target bridge arm to be turned on, and controlling the switches connected in series with the num1 first discharge battery cells in the first target bridge arm to be turned on, and controlling the switches connected in parallel with the battery cells other than the num1 first discharge battery cells in the first target bridge arm to be turned on, while disconnecting the other switches.

[0238] When the num1 first discharge battery cells in the first target bridge arm charge the energy storage unit, the voltages across the num1 first discharge battery cells in the first target bridge arm decrease.

[0239] Step S62 : when the voltage of the energy storage unit is the same as the voltage across the num1 first discharge battery cells, control the num1 first discharge battery cells in the first target bridge arm to stop charging the energy storage unit.

[0240] Step S63: Control the energy storage unit to charge num2 first rechargeable battery cells in the first target bridge arm.

[0241] In this embodiment, the num2 first rechargeable battery cells in the first target bridge arm are the first num2 battery cells in the first target bridge arm when the battery cells are sorted in ascending order of voltage across the battery cells. Based on this, it can be seen that the num2 first rechargeable battery cells in the first target bridge arm are the battery cells with the lowest voltage in the first target bridge arm. num1 and num2 may be the same or different.

[0242] When the voltage of the energy storage unit is the same as the voltage across the num1 first discharge battery cells, the energy storage unit is disconnected from the num1 first discharge battery cells to stop charging the energy storage unit from the num1 first discharge battery cells in the first target bridge arm. At this point, the voltage across the energy storage unit is greater than the voltage across the num2 first charge battery cells in the first target bridge arm, indicating a potential difference between the energy storage unit and the num2 first charge battery cells in the first target bridge arm. Disconnecting the energy storage unit from the num1 first discharge battery cells can be accomplished by disconnecting all switches.

[0243] Furthermore, by controlling the num2 first rechargeable battery cells in the first target bridge arm to be connected to the energy storage unit, the energy storage unit can charge the num2 first rechargeable battery cells in the first target bridge arm based on the potential difference.

[0244] Among them, the method of controlling the connection between the num2 first rechargeable battery cells in the first target bridge arm and the energy storage unit can be: controlling the switches at both ends of the first target bridge arm to be turned on, the switches connected in series with the num2 first rechargeable battery cells in the first target bridge arm to be turned on, and the switches connected in parallel with the battery cells other than the num2 first rechargeable battery cells in the first target bridge arm to be turned on, and the other switches are disconnected.

[0245] When the energy storage unit charges the num2 first rechargeable battery cells in the first target bridge arm, the voltage of the num2 first rechargeable battery cells in the first target bridge arm increases, thereby achieving voltage balance within the bridge arm.

[0246] In one embodiment of the present application, the control method of the battery circuit provided in the embodiment of the present application further includes the following step S64.

[0247] Step S64, when the voltage of the energy storage unit is the same as the voltage across the num2 first charging battery cells, repeatedly controlling the num1 first discharging battery cells in the first target bridge arm to charge the energy storage unit until the voltage difference between the voltage across the num1 first discharging battery cells and the voltage across the num2 first charging battery cells is less than or equal to a first preset threshold.

[0248] In this embodiment, when the voltage of the energy storage unit is the same as the voltage across the num2 first rechargeable battery cells, the potential difference between the energy storage unit and the num2 first rechargeable battery cells is zero. Therefore, the energy storage unit cannot charge the num2 first rechargeable battery cells. In this case, step S61 is repeated to control the num1 first discharge battery cells in the first target bridge arm to continue charging the energy storage unit, and the energy storage unit to continue charging the num2 first rechargeable battery cells in the first target bridge arm.

[0249] When the voltage difference between the voltage across the num1 first discharging battery cells and the voltage across the num2 first charging battery cells is less than or equal to the first preset threshold, the voltages between the battery cells in the first target bridge arm are balanced.

[0250] Based on this embodiment, voltage balancing among battery cells in the first bridge arm can be achieved.

[0251] In one embodiment of the present application, there are n battery cells in the first target bridge arm, num1 is the same as num2, and when n is an even number, num1≤n / 2; when n is an odd number, num1≤(n+1) / 2.

[0252] In this embodiment, based on the above limitation, it is possible to avoid the same battery cell in the first target bridge arm being used as both the first discharging battery cell and the first charging battery cell.

[0253] In one example, based on the battery circuit example shown in FIG8 , if the first target bridge arm is the first bridge arm 12a2, and the first discharging battery cells are the first battery cells 12a21a and 12a21d, respectively, and the first charging battery cells are the first battery cells 12a21b and 12a21c, respectively, then, based on steps S61 to S64 above, the first switch 12a1, the second switch 12a3, the third switch 12a22a, the fourth switch 12a23b, the fourth switch 12a23c, and the third switch 12a22d are controlled to be turned on, while the remaining switches are turned off; at this point, the first battery cells 12a21a and 12a21d charge the energy storage unit 11.

[0254] When the voltage across the energy storage unit 11 is the same as the voltage across the first battery cell 12a21a and the first battery cell 12a21d connected in series, all switches are turned off. At this time, the num1 first discharge battery cells in the first target bridge arm stop charging the energy storage unit. In addition, the first switch 12a1, the second switch 12a3, the fourth switch 12a23a, the third switch 12a22b, the third switch 12a22c, and the fourth switch 12a23d are controlled to be turned on, and the remaining switches are turned off. At this time, the energy storage unit 11 charges the num2 first charge battery cells.

[0255] When the voltage of the energy storage unit 11 is equal to the voltage across the first battery cell 12a21b and the first battery cell 12a21c connected in series, the third switch 12a22a, the fourth switch 12a23b, the fourth switch 12a23c, and the third switch 12a22d are turned on again, and the fourth switch 12a23a, the third switch 12a22b, the third switch 12a22c, and the fourth switch 12a23d are turned off, until the voltage difference across the first battery cell 12a21a and the first battery cell 12a21d connected in series and the voltage difference across the first battery cell 12a21b and the first battery cell 12a21c connected in series is less than or equal to a first preset threshold.

[0256] In one embodiment of the present application, the battery circuit further includes a discharge unit. On this basis, the battery circuit control method provided in the embodiment of the present application further includes the following steps S65 and S66.

[0257] Step S65 , when the voltage difference between the voltage across the num1 first discharging battery cells and the voltage across the num2 first charging battery cells is less than or equal to the first preset threshold, controlling the discharging unit to connect to the energy storage unit.

[0258] In this embodiment, when the voltage difference between the voltage across the num1 first discharging battery cells and the voltage across the num2 first charging battery cells is less than or equal to a first preset threshold, it indicates that the voltage within the first target bridge arm is balanced. At this point, the discharge unit is controlled to connect to the energy storage unit. In this case, the discharge unit consumes the energy in the energy storage unit, preventing the energy storage unit from becoming charged. Controlling the connection between the discharge unit and the energy storage unit can be accomplished by controlling the conduction of the eleventh switch 16 and the twelfth switch 17 in the battery circuit shown in Figures 5 to 8.

[0259] Step S66 : when the voltage difference between the voltage across the num1 first discharging battery cells and the voltage across the num2 first charging battery cells is greater than a first preset threshold, the discharge cell is controlled to be disconnected from the energy storage unit.

[0260] Corresponding to step S66 above, if the voltage difference between the voltage across the num1 first discharging battery cells and the voltage across the num2 first charging battery cells is greater than the first preset threshold, it indicates that the voltage within the bridge arm is not yet balanced. At this point, the energy storage unit still needs to be charged. At this point, the discharge unit is controlled to disconnect from the energy storage unit.

[0261] The method of controlling the discharge unit to be disconnected from the energy storage unit may be to control the eleventh switch 16 and the twelfth switch 17 in the battery circuit shown in FIG. 5 to FIG. 8 to be disconnected.

[0262] In one embodiment of the present application, the control method of the battery circuit provided in the embodiment of the present application further includes the following steps S67 to S69.

[0263] Step S67 : When the voltage balance condition between the bridge arms is met, control the num4 second discharge battery cells in the num3 second target bridge arms to charge the energy storage unit.

[0264] In this embodiment, the voltage balancing condition between bridge arms refers to a condition requiring voltage balancing between bridge arms.

[0265] The second target bridge arm refers to any bridge arm with a high voltage that requires voltage balancing between bridge arms.

[0266] Based on the example shown in FIG8 , the voltage balance between the bridge arms may specifically be the voltage balance between the first bridge arms, the voltage balance between the second bridge arms, or the voltage balance between the first bridge arm and the second bridge arm.

[0267] In one embodiment of the present application, the num3 second target bridge arms are the bridge arms that are located at the front num3 when the voltages at both ends of the bridge arms are sorted from large to small. num 3 is an integer greater than 0.

[0268] The num4 second discharge battery cells are the first num4 battery cells in the num3 second target bridge arms when the voltages of the battery cells are sorted from large to small. Based on this, it can be seen that the num4 second discharge battery cells are the battery cells with high voltages in the num3 second target bridge arms.

[0269] By controlling the num4 second discharge battery cells in the num3 second target bridge arms to be connected to the energy storage unit, the num4 second discharge battery cells in the num3 second target bridge arms can charge the energy storage unit.

[0270] When the num4 second discharge battery cells charge the energy storage unit, the voltage across the num4 second discharge battery cells decreases.

[0271] Step S68 : When the voltage of the energy storage unit is the same as the voltage across the num4 second discharge battery cells, control the num4 second discharge battery cells to stop charging the energy storage unit.

[0272] Step S69: controlling the energy storage unit to charge the num6 second rechargeable battery cells in the num5 third target bridge arms.

[0273] In this embodiment, the third target bridge arm refers to any bridge arm with a low voltage that requires voltage balancing between bridge arms. The third target bridge arm may be the first bridge arm or the second bridge arm.

[0274] In one embodiment of the present application, the num5 third target bridge arms are the bridge arms located at the front num5 when the voltages at both ends of the bridge arms are sorted from small to large.

[0275] The num6 second rechargeable battery cells are the first num6 battery cells in the num5 third target bridge arms when the voltage across the battery cells is sorted from smallest to largest. Based on this, it can be seen that the num6 second rechargeable battery cells are the battery cells with low voltage in the num5 third target bridge arms.

[0276] The num4 second discharge battery cells can be disconnected from the energy storage unit to stop the num4 second discharge battery cells from charging the energy storage unit, and the num6 second charge battery cells can be connected to the energy storage unit to charge the num6 second charge battery cells.

[0277] When the voltage of the energy storage unit is the same as the voltage across the num4 second discharge battery cells, the num4 second discharge battery cells are controlled to stop charging the energy storage unit. At this time, the voltage across the energy storage unit is greater than the voltage across the num6 second charge battery cells, that is, there is a potential difference between the energy storage unit and the num6 second charge battery cells.

[0278] Furthermore, the energy storage unit is controlled to be connected to the num6 second rechargeable battery cells, so that the energy storage unit charges the num6 second rechargeable battery cells based on the potential difference.

[0279] When the energy storage unit charges num6 second rechargeable battery cells, the voltages of the num6 second rechargeable battery cells increase, thereby achieving voltage balance between the bridge arms.

[0280] It should be noted that, in the above embodiment, num3 and num5 may be the same or different. Similarly, num4 and num6 may be the same or different.

[0281] Based on the above-mentioned embodiment of steps S67 to S69, the control method of the battery circuit provided in the embodiment of the present application further includes the following step S610.

[0282] Step S610, when the voltage of the energy storage unit is the same as the voltage across the num6 second rechargeable battery cells, repeatedly controlling the num4 second discharge battery cells to charge the energy storage unit until the voltage difference between the voltage across the num4 second discharge battery cells and the voltage across the num6 second rechargeable battery cells is less than or equal to a second preset threshold.

[0283] The second preset threshold is a maximum allowable voltage deviation between the bridge arms of the battery circuit when the voltages between the bridge arms are balanced.

[0284] It should be noted that the specific implementation of the above step S610 is similar to the specific implementation of the above step S64, and will not be repeated here.

[0285] In one embodiment of the present application, the battery circuit further includes a discharge unit. On this basis, the control method of the battery circuit provided in the embodiment of the present application further includes the following steps S611 and S612.

[0286] Step S611 , when the voltage difference between the voltage across the num4 second discharging battery cells and the voltage across the num6 second charging battery cells is less than or equal to a second preset threshold, controlling the discharging unit to connect to the energy storage unit.

[0287] Step S612 : when the voltage difference between the voltage across the num4 second discharging battery cells and the voltage across the num6 second charging battery cells is greater than a second preset threshold, the discharge unit is controlled to be disconnected from the energy storage unit.

[0288] It should be noted that the specific implementation of the above step S611 is similar to the specific implementation of the above step S65, and the specific implementation of the above step S612 is similar to the specific implementation of the above step S66, which will not be repeated here.

[0289] In one example, based on the example shown in FIG8 , if num3 and num5 are both 1, num4 and num6 are 2, and the second target bridge arm is the first bridge arm 12b2, the second discharge battery cells are the first battery cell 12b21a and the first battery cell 12b21d, the third target bridge arm is the second bridge arm 12a5, and the second charge battery cells are the second battery cell 12a51a and the second battery cell 12a51d. At this time, based on steps S67 to S610 above, the first switch 12b1, the second switch 12b3, the third switch 12b22a, the fourth switch 12b23b, the fourth switch 12b23c, the third switch 12b22d, and the sixth switch 14 are controlled to be turned on, and the remaining switches are turned off. At this time, the num4 second discharge battery cells charge the energy storage unit 11;

[0290] When the voltage across the energy storage unit 11 is equal to the voltage across the num4 second discharge cells connected in series, all switches are controlled to be disconnected. At this point, the num4 second discharge cells stop charging the energy storage unit. Furthermore, the fifth switch 13, the seventh switch 12a4, the eighth switch 12a6, the ninth switch 12a52a, the tenth switch 12a53b, the tenth switch 12a53c, and the ninth switch 12a52d are controlled to be turned on, while the remaining switches are turned off. At this point, the energy storage unit 11 charges the num6 second rechargeable battery cells.

[0291] When the voltage of the energy storage unit 11 is the same as the voltage across the second battery cell 12a51a and the second battery cell 12a51d connected in series, the first switch 12b1, the second switch 12b3, the third switch 12b22a, the fourth switch 12b23b, the fourth switch 12b23c, the third switch 12b22d, and the sixth switch 14 are controlled to be turned on again, and the remaining switches are turned off until the voltage across the num4 second discharge battery cells and the num6 second charge battery cells is less than the second preset threshold.

[0292] In another example, based on the example shown in Figure 8, if num3 and num5 are both 2, num4 and num6 are both 4, and the second target bridge arm is the first bridge arm 12a2 and the second bridge arm 12c5, the third target bridge arm is the first bridge arm 12b2 and the second bridge arm 12a5, the second discharging battery cells are the first battery cell 12a21b, the first battery cell 12a21c, the second battery cell 12c51b, and the second battery cell 12c51c, and the second charging battery cells are the first battery cell 12b21a, the first battery cell 12b21d, the second battery cell 12a51a, and the second battery cell 12a51d. At this time, based on steps S67 to S610 above, the first switch 12a1, the second switch 12a3, the fourth switch 12a23a, the third switch 12a22b, the third switch 12a22c, the fourth switch 12a23d, the seventh switch 12c4, the eighth switch 12c6, the tenth switch 12c53a, the ninth switch 12c52b, the ninth switch 12c52c, and the tenth switch 12c53d are controlled to be turned on, and the remaining switches are turned off; at this time, the num4 second discharge battery cells charge the energy storage unit 11.

[0293] When the voltage across the energy storage unit 11 is the same as the voltage across the num4 second discharge cells connected in series, all switches are controlled to be disconnected; at this time, the num4 second discharge battery cells stop charging the energy storage unit; and the first switch 12b1, the second switch 12b3, the third switch 12b22a, the fourth switch 12b23b, the fourth switch 12b23c, the third switch 12b22d, the seventh switch 12a4, the eighth switch 12a5, the ninth switch 12a52a, the tenth switch 12a53b, the tenth switch 12a53c, and the ninth switch 12a52d are controlled to be turned on; at this time, the energy storage unit 11 charges the num6 second rechargeable battery cells.

[0294] Furthermore, when the voltage of the energy storage unit 11 is the same as the voltage across the first battery cell 12b21a, the first battery cell 12b21d, the second battery cell 12a51a, and the second battery cell 12a51d connected in series, the first switch 12a1, the second switch 12a3, the fourth switch 12a23a, the third switch 12a22b, the third switch 12a22c, the fourth switch 12a23d, the seventh switch 12c4, the eighth switch 12c6, the tenth switch 12c53a, the ninth switch 12c52b, the ninth switch 12c52c, and the tenth switch 12c53d are re-controlled to be turned on, and the remaining switches are turned off; until the voltage across the num4 second discharge battery cells and the num6 second rechargeable battery cells is less than the second preset threshold value.

[0295] In one embodiment of the present application, the control method of the battery circuit provided in the embodiment of the present application further includes the following steps S613 to S615.

[0296] Step S613: Obtain voltage balancing type.

[0297] In one embodiment of the present application, the above step S613 can be implemented in the following two ways.

[0298] The first method is to manually input the voltage balancing type. Specifically, the technician determines the voltage balancing type based on the test results of each battery cell in the battery circuit.

[0299] The second method is to establish a rule and use it to determine the voltage balancing type. The rule could be: if the voltage difference between battery cells in a bridge arm is greater than a first preset threshold, the voltage balancing type is determined to be intra-arm voltage balancing, and that bridge arm is used as the first target bridge arm. If the voltage difference between at least one bridge arm and at least one other bridge arm is greater than a second preset threshold, the voltage balancing type is determined to be inter-arm voltage balancing. It should be noted that this rule can be set by technical personnel based on experience.

[0300] Step S614 : When the voltage balancing type is voltage balancing within the bridge arm, it is determined whether a voltage balancing condition within the bridge arm is satisfied.

[0301] Step S615 : When the voltage balancing type is inter-bridge-arm voltage balancing, determining whether an inter-bridge-arm voltage balancing condition is satisfied.

[0302] <Electronic Equipment Example>

[0303] The present application also provides an electronic device, which includes any one of the battery circuits 10 provided in the above battery circuit embodiments.

[0304] Alternatively, as shown in Figure 12, the electronic device 600 includes a memory 610 and a processor 620, wherein the memory 610 is used to store computer instructions, and the processor 620 is used to call the computer instructions from the memory 610 to execute the battery circuit control method as described in any of the above-mentioned battery circuit control method embodiments.

[0305] <Storage Medium Embodiment>

[0306] The present application also provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the computer program implements the battery circuit control method according to any one of the above-mentioned battery circuit control method embodiments.

[0307] The present application may be a system, method and / or computer program product. The computer program product may include a computer-readable storage medium carrying computer-readable program instructions for causing a processor to implement various aspects of the present application.

[0308] A computer-readable storage medium can be a tangible device that can hold and store instructions for use by an instruction execution device. A computer-readable storage medium can be, for example, but not limited to, an electrical storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination thereof. More specific examples (a non-exhaustive list) of computer-readable storage media include: a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a static random access memory (SRAM), a portable compact disc read-only memory (CD-ROM), a digital versatile disk (DVD), a memory stick, a floppy disk, a mechanical encoding device, such as a punch card or a raised structure in a groove on which instructions are stored, and any suitable combination thereof. As used herein, a computer-readable storage medium is not to be construed as a transient signal per se, such as a radio wave or other freely propagating electromagnetic wave, an electromagnetic wave propagating through a waveguide or other transmission medium (e.g., a light pulse through a fiber optic cable), or an electrical signal transmitted through an electrical wire.

[0309] The computer-readable program instructions described herein can be downloaded from a computer-readable storage medium to each computing / processing device, or downloaded to an external computer or external storage device via a network, such as the Internet, a local area network, a wide area network, and / or a wireless network. The network can include copper transmission cables, fiber optic transmission, wireless transmission, routers, firewalls, switches, gateway computers, and / or edge servers. The network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards the computer-readable program instructions to be stored in the computer-readable storage medium in each computing / processing device.

[0310] The computer program instructions for performing the operation of the present application can be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-related instructions, microcode, firmware instructions, state setting data or source code or object code written in any combination of one or more programming languages, wherein the programming language includes object-oriented programming languages ​​such as Smalltalk, C++, and conventional procedural programming languages ​​such as "C" language or similar programming languages. Computer-readable program instructions can be executed completely on the user's computer, partially on the user's computer, executed as an independent software package, partially on the user's computer and partially on a remote computer, or executed completely on a remote computer or server. In the case of a remote computer, the remote computer can be connected to the user's computer by any type of network including a local area network (LAN) or a wide area network (WAN), or can be connected to an external computer (such as by using an Internet service provider to connect to the Internet). In certain embodiments, by utilizing the state information of computer-readable program instructions to personalize electronic circuits, such as programmable logic circuits, field programmable gate arrays (FPGAs) or programmable logic arrays (PLAs), the electronic circuits can execute computer-readable program instructions, thereby realizing various aspects of the present application.

[0311] Various aspects of the present application are described herein with reference to flowcharts and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the present application. It should be understood that each block of the flowcharts and / or block diagrams, and combinations of blocks in the flowcharts and / or block diagrams, can be implemented by computer-readable program instructions.

[0312] These computer-readable program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, thereby producing a machine, so that when these instructions are executed by the processor of the computer or other programmable data processing device, a device is generated that implements the functions / actions specified in one or more blocks in the flowchart and / or block diagram. These computer-readable program instructions can also be stored in a computer-readable storage medium, where these instructions cause the computer, programmable data processing device, and / or other device to operate in a specific manner. Thus, the computer-readable medium storing the instructions comprises an article of manufacture that includes instructions for implementing various aspects of the functions / actions specified in one or more blocks in the flowchart and / or block diagram.

[0313] Computer-readable program instructions may also be loaded onto a computer, other programmable data processing apparatus, or other device so that a series of operational steps are performed on the computer, other programmable data processing apparatus, or other device to produce a computer-implemented process, thereby causing the instructions executed on the computer, other programmable data processing apparatus, or other device to implement the functions / actions specified in one or more blocks in the flowchart and / or block diagram.

[0314] The flowcharts and block diagrams in the accompanying drawings show the possible architecture, functions and operations of the systems, methods and computer program products according to multiple embodiments of the present application. In this regard, each box in the flowchart or block diagram can represent a part of a module, program segment or instruction, and the part of the module, program segment or instruction contains one or more executable instructions for realizing the specified logical function. In some alternative implementations, the functions marked in the box can also occur in an order different from that marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flowchart, and the combination of the boxes in the block diagram and / or flowchart, can be implemented by a dedicated hardware-based system that performs the specified function or action, or can be implemented by a combination of dedicated hardware and computer instructions. It is well known to those skilled in the art that implementation by hardware, implementation by software, and implementation by a combination of software and hardware are all equivalent.

[0315] It is understandable that those skilled in the art can make equivalent substitutions or changes based on the technical solution and inventive concept of this application, and all these changes or substitutions should fall within the scope of protection of the claims attached to this application.

Claims

1. A battery circuit (10), wherein: include: An energy storage module (11), wherein the energy storage module (11) comprises two groups of energy storage units (111, 112) connected in parallel; At least one battery pack (12), for any of the battery packs (12), the battery pack (12) is connected in parallel to both ends of the energy storage module (11), and the battery pack (12) includes a first bridge arm (12a2), and the first bridge arm (12a2) includes at least two first battery cells (12a21a, 12a21b, 12a21c, 12a21d) connected in series; and A processing module (19) is connected to a control end of the energy storage module (11) and a control end of the battery pack (12), and is used to control at least one first battery cell (12a21a, 12a21b, 12a21c, 12a21d) in at least one battery pack (12) to be connected to an energy storage unit (111 / 112) in the energy storage module (11).

2. The battery circuit (10) according to claim 1, wherein For any battery pack (12), the battery pack (12) further includes a first switch (12a1) and a second switch; The first end of the energy storage module (11), the first switch (12a1), the first bridge arm (12a2), the second switch (12a2), and the second end of the energy storage module (11) are connected in sequence; The processing module (19) is connected to the control ends of the first switch (12a1) and the second switch (12a2).

3. The battery circuit (10) according to claim 1 or 2, wherein: The first bridge arm (12a2) further includes a third switch (12a22a) and a fourth switch (12a23a), any of the first battery cells is connected in series with the third switch (12a22a), and any of the first battery cells (12a21a, 12a21b, 12a21c, 12a21d) is connected in series with the third switch (12a22a) and then connected in parallel with the fourth switch (12a23a); The processing module (19) is connected to the control ends of the third switch (12a22a) and the fourth switch (12a23a).

4. The battery circuit (10) according to any one of claims 1 to 3, wherein: Any of the energy storage units (111 / 112) comprises an energy storage subunit (1112a, 1112b, 1112c), a fifth switch (1111) and a sixth switch (1113), wherein the energy storage subunit (1112a, 1112b, 1112c) is connected between the fifth switch (1111) and the sixth switch (1113); The processing module (19) is connected to the control ends of the fifth switch (1111) and the sixth switch (1113).

5. The battery circuit (10) according to any one of claims 1 to 4, wherein: For at least one battery pack (12), a second bridge arm (12a5 / 12b5 / 12c5) is also included, the second bridge arm (12a5 / 12b5 / 12c5) includes a second battery cell (12a51a / 12b51a / 12c51a), and the processing module (19) is further used to control the second battery cell (12a51a / 12b51a / 12c51a) in the second bridge arm (12a5 / 12b5 / 12c5) to be connected to the energy storage module (11).

6. The battery circuit (10) according to claim 5, wherein: The first bridge arm (12a2) is connected in parallel to both ends of the energy storage module (11), and the second bridge arm (12a5 / 12b5 / 12c5) is connected in parallel to both ends of the energy storage module (11).

7. The battery circuit (10) according to claim 6, wherein: For at least one battery pack (12), further comprising: a ninth switch (12a4 / 12b4 / 12c4) and a tenth switch (12a6 / 12b6 / 12c6), wherein the first end of the energy storage module (11), the ninth switch (12a4 / 12b4 / 12c4), the second bridge arm (12a5 / 12b5 / 12c5), the tenth switch (12a6 / 12b6 / 12c6), and the second end of the energy storage module (11) are connected in sequence; The second bridge arm (12a5 / 12b5 / 12c5) includes: at least two second battery cells (12a51a, 12a51b) connected in series; The processing module (19) is connected to the control ends of the ninth switch (12a4 / 12b4 / 12c4) and the tenth switch (12a6 / 12b6 / 12c6), respectively, and is also used to control at least one second battery cell (12a51a / 12b51a / 12c51a) in at least one of the battery packs (12) to be connected to an energy storage unit (111 / 112) in the energy storage module (11).

8. The battery circuit (10) according to claim 5, wherein: The battery circuit (10) further comprises a seventh switch (13) and an eighth switch (14), wherein: The first end of the energy storage module (11), the seventh switch (13), the second bridge arm (12a5 / 12b5 / 12c5), and the second end of the energy storage module (11) are connected in sequence; The first end of the energy storage module (11), the first bridge arm (12a2), the eighth switch (14), and the second end of the energy storage module (11) are connected in sequence; The processing module (19) is connected to the control ends of the seventh switch (13) and the eighth switch (14).

9. The battery circuit (10) according to claim 8, wherein: The seventh switch (13) and the eighth switch (14) are connected in series; The first bridge arm (12a2) and the second bridge arm (12a5 / 12b5 / 12c5) are connected in series; The connection point between the seventh switch (13) and the eighth switch (14) is connected to the connection point between the first bridge arm (12a2) and the second bridge arm (12a5 / 12b5 / 12c5).

10. The battery circuit (10) according to claim 5, wherein: The second bridge arm (12a5 / 12b5 / 12c5) further includes: an eleventh switch (12a52a) and a twelfth switch (12a53a), and any second battery cell (12a51a) is connected in series with the eleventh switch (12a52a) and then connected in parallel with the twelfth switch (12a53a); The processing module (19) is connected to the control ends of the eleventh switch (12a52a) and the twelfth switch (12a53a).

11. The battery circuit (10) according to any one of claims 1 to 10, wherein: The battery circuit (10) further includes a discharge module (15), and the discharge module (15) is connected in parallel with the energy storage module (11).

12. The battery circuit (10) according to claim 11, wherein: The discharge module (15) comprises a thirteenth switch (151), a fourteenth switch (153) and a discharge unit (152), wherein the thirteenth switch (151), the discharge unit (152) and the fourteenth switch (153) are sequentially connected in series; The processing module (19) is connected to the control ends of the thirteenth switch (151) and the fourteenth switch (153), and is used to control whether the discharge unit (152) is connected to the energy storage module (11).

13. A battery circuit (10), wherein: include: Energy storage unit (11); At least one battery pack (12), wherein for any battery pack (12), the battery pack (12) is connected in parallel to both ends of the energy storage unit (11), and the battery pack (12) includes a first bridge arm (12a2), and the first bridge arm (12a2) includes at least two first battery cells (12a21a, 12a21b) connected in series; a processing unit (19), the processing unit (19) being connected to a control end of the energy storage unit (11) and a control end of any one of the first bridge arms (12a2), and being used to control at least one first battery cell (12a21a / 12a21b) in at least one of the first bridge arms (12a2) to be connected to the energy storage unit (11); The rated voltages of the different first battery cells (12a21a, 12a21b) are the same.

14. The battery circuit (10) according to claim 13, wherein: For any battery pack (12), further comprising: A first switch (12a1) and a second switch (12a3), a first end of the energy storage unit (11), the first switch (12a1), the first bridge arm (12a2), the second switch (12a3) and the second end of the energy storage unit (11) are connected in sequence; The processing unit (19) is connected to the control ends of the first switch (12a1) and the second switch (12a3).

15. The battery circuit (10) according to claim 13 or 14, wherein: The first bridge arm (12a2) further includes a third switch (12a22a) and a fourth switch (12a23a), wherein any one of the first battery cells (12a21a) is connected in series with the third switch (12a22a), and any one of the first battery cells (12a21a) and the third switch (12a22a) is connected in series and then connected in parallel with the fourth switch (12a23a); The processing unit (19) is connected to the control ends of the third switch (12a22a) and the fourth switch (12a23a).

16. The battery circuit (10) according to any one of claims 13 to 15, wherein: For at least one battery pack (12), a second bridge arm (12a5) is also included, the second bridge arm (12a5) includes a second battery cell (12a51a), and the processing unit (19) is further used to control the second battery cell (12a51a) in the second bridge arm (12a5) to be connected to the energy storage unit (11).

17. The battery circuit (10) according to claim 16, wherein: The first bridge arm (12a2) is connected in parallel to both ends of the energy storage unit (11), and the second bridge arm (12a5) is connected in parallel to both ends of the energy storage unit (11).

18. The battery circuit (10) according to claim 17, wherein: For at least one battery pack (12), further comprising: a seventh switch (12a4) and an eighth switch (12a6), wherein the first end of the energy storage unit (11), the seventh switch (12a4), the second bridge arm (12a5), the eighth switch (12a6), and the second end of the energy storage unit (11) are connected in sequence; The second bridge arm (12a5) includes at least two second battery cells (12a51a, 12a51b) connected in series; The processing unit (19) is connected to the control ends of the seventh switch (12a4) and the eighth switch (12a6), and is also used to control at least one second battery cell (12a51a / 12a51b) in at least one second bridge arm (12a5) to be connected to the energy storage unit (11).

19. The battery circuit (10) according to claim 16, wherein: The battery circuit (10) further comprises a fifth switch (13) and a sixth switch (14), wherein: The first end of the energy storage unit (11), the fifth switch (13), the second bridge arm (12a5), and the second end of the energy storage unit (11) are connected in sequence; The first end of the energy storage unit (11), the first bridge arm (12a2), the sixth switch (14), and the second end of the energy storage unit (11) are connected in sequence; The processing unit (19) is connected to the control ends of the fifth switch (13) and the sixth switch (14).

20. The battery circuit (10) according to claim 19, wherein The fifth switch (13) and the sixth switch (14) are connected in series; The first bridge arm (12a2) and the second bridge arm (12a5) are connected in series; The connection point between the fifth switch (13) and the sixth switch (14) is connected to the connection point between the first bridge arm (12a2) and the second bridge arm (12a5).

21. The battery circuit (10) of claim 16, wherein: The second bridge arm (12a5) further includes: a ninth switch (12a52a) and a tenth switch (12a53a), any second battery cell (12a51a) connected in series with the ninth switch (12a52a), and any second battery cell (12a51a) connected in series with the ninth switch (12a52a) and then connected in parallel with the tenth switch (12a53a); The processing unit (19) is connected to the control ends of the ninth switch (12a52a) and the tenth switch (12a53a).

22. The battery circuit (10) according to any one of claims 13 to 21, wherein: The battery circuit (10) further includes a discharge unit (15), wherein: The discharge unit (15) is connected in parallel with the energy storage unit (11).

23. The battery circuit (10) according to claim 22, wherein: The battery circuit (10) further includes: an eleventh switch (16) and a twelfth switch (17), wherein: The first end of the energy storage unit (11), the eleventh switch (16), the discharge unit (15), the twelfth switch and the second end of the energy storage unit (11) are connected in sequence; The processing unit (19) is connected to the control ends of the eleventh switch (16) and the twelfth switch (17), and is used to control whether the discharge unit (15) is connected to the energy storage unit (11).

24. A method for controlling a battery circuit, wherein: The method comprises: When a voltage balance condition within the bridge arm is met, controlling num1 first discharge battery cells in the first target bridge arm to charge the first target energy storage unit in the energy storage module; When the voltage of the first target energy storage unit is the same as the voltage across the num1 first discharge battery cells, controlling the num1 first discharge battery cells in the first target bridge arm to stop charging the first target energy storage unit; Controlling the first target energy storage unit to charge num2 first rechargeable battery cells in the first target bridge arm; Wherein, the first target energy storage unit is an energy storage unit in the energy storage module that is different from the energy storage unit used for the previous voltage balancing; The battery circuit includes an energy storage module and a battery pack. The energy storage module includes two groups of energy storage units connected in parallel. The battery pack includes a bridge arm, and the bridge arm includes at least two battery cells connected in series.

25. The method according to claim 24, wherein The method further comprises: When the voltage of the first target energy storage unit is the same as the voltage across the num2 first charging battery cells, the step of controlling the num1 first discharging battery cells in the first target bridge arm to charge the first target energy storage unit is repeated until the voltage difference between the voltage across the num1 first discharging battery cells and the voltage across the num2 first charging battery cells is less than or equal to a first preset threshold.

26. The method according to claim 24 or 25, wherein: There are n battery cells in the first target bridge arm, num1 is the same as num2, and when n is an even number, num1≤n / 2; when n is an odd number, num1≤(n+1) / 2.

27. The method according to any one of claims 24 to 26, wherein: The method further comprises: When the voltage difference between the voltage across the num1 first discharge battery cells and the voltage across the num2 first charge battery cells is less than or equal to a first preset threshold, controlling the discharge module to connect to the first target energy storage unit; When the voltage difference between the voltage across the num1 first discharging battery cells and the voltage across the num2 first charging battery cells is greater than the first preset threshold, controlling the discharging module to disconnect from the first target energy storage unit; Wherein, the battery circuit further includes a discharge module.

28. The method according to any one of claims 24 to 27, wherein: The method further comprises: When the voltage balance condition between the bridge arms is met, control the num4 second discharge battery cells in the num3 second target bridge arms to charge the second target energy storage unit; When the voltage of the second target energy storage unit is the same as the voltage across the num4 second discharge battery cells, controlling the num4 second discharge battery cells to stop charging the second target energy storage unit; Control the second target energy storage unit to charge num6 second rechargeable battery cells in num5 third target bridge arms; The second target energy storage unit is an energy storage unit in the energy storage module that is different from the energy storage unit used for the previous voltage balancing.

29. The method according to claim 28, wherein The method further comprises: Get voltage balancing type; When the voltage equalization type is voltage equalization within a bridge arm, determining that a voltage equalization condition within a bridge arm is satisfied; When the voltage balancing type is inter-bridge-arm voltage balancing, it is determined that an inter-bridge-arm voltage balancing condition is satisfied.

30. A method for controlling a battery circuit, wherein: The method comprises: When the voltage balance condition in the bridge arm is met, controlling num1 first discharge battery cells in the first target bridge arm to charge the energy storage unit; When the voltage of the energy storage unit is the same as the voltage across the num1 first discharge battery cells, controlling the num1 first discharge battery cells in the first target bridge arm to stop charging the energy storage unit; Controlling the energy storage unit to charge num2 first rechargeable battery cells in the first target bridge arm; The battery circuit includes: an energy storage unit and a battery pack; the battery pack includes a bridge arm, and the bridge arm includes at least two battery cells connected in series.

31. The method according to claim 30, wherein The method further comprises: When the voltage of the energy storage unit is the same as the voltage across the num2 first rechargeable battery cells, repeatedly controlling the num1 first discharge battery cells in the first target bridge arm to charge the energy storage unit until a voltage difference between the voltage across the num1 first discharge battery cells and the voltage across the num2 first rechargeable battery cells is less than or equal to a first preset threshold.

32. The method according to claim 30 or 31, wherein: There are n battery cells in the first target bridge arm, num1 is the same as num2, and when n is an even number, num1≤n / 2; when n is an odd number, num1≤(n+1) / 2.

33. The method according to any one of claims 30 to 32, wherein: The method further comprises: When the voltage difference between the voltage across the num1 first discharge battery cells and the voltage across the num2 first charge battery cells is less than or equal to a first preset threshold, controlling the discharge unit to connect to the energy storage unit; When the voltage difference between the voltage across the num1 first discharge battery cells and the voltage across the num2 first charge battery cells is greater than the first preset threshold, controlling the discharge unit to disconnect from the energy storage unit; Wherein, the battery circuit further includes a discharge unit.

34. The method according to any one of claims 30 to 33, wherein: The method further comprises: When the voltage balance condition between the bridge arms is met, the num4 second discharge battery cells in the num3 second target bridge arms are controlled to charge the energy storage unit; When the voltage of the energy storage unit is the same as the voltage across the num4 second discharge battery cells, controlling the num4 second discharge battery cells to stop charging the energy storage unit; The energy storage unit is controlled to charge the num6 second rechargeable battery cells in the num5 third target bridge arms.

35. An electronic device (600), wherein: The electronic device (600) comprises a battery circuit (10) according to any one of claims 1 to 23; Alternatively, the electronic device (600) includes a memory (610) and a processor (620), wherein the memory (610) is used to store computer instructions, and the processor (620) is used to call the computer instructions from the memory (610) to execute the method according to any one of claims 24 to 34.

36. A computer-readable storage medium, wherein: A computer program is stored thereon, which, when executed by a processor (620), implements the method according to any one of claims 24-34.

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