Battery circuit, control method of battery circuit, equipment and medium

Abstract

The invention discloses a battery circuit, a control method of the battery circuit, equipment and a medium, and relates to the technical field of batteries, the battery circuit comprises an energy storage unit, at least one battery pack and a processing unit, for any battery pack, the battery pack is connected to the two ends of the energy storage unit in parallel, and the battery pack comprises a first bridge arm; the first bridge arm comprises at least two first single batteries which are connected in series; the processing unit is connected with the control end of the energy storage unit and the control end of any first bridge arm, and is used for controlling at least one first battery monomer in the at least one first bridge arm to be connected with the energy storage unit; wherein different first battery monomers have the same rated voltage. The battery circuit provides a hardware basis for voltage balance control among the single batteries.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, 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

[0002] In practical applications, due to the limitations of the energy and capacity of a single battery cell, a single battery cell cannot meet the requirements of high-power level loads. Therefore, single battery cells are generally connected in series and parallel to form a battery pack.

[0003] However, during the use of a battery pack, since there are differences in many parameters such as the initial capacity, equivalent series internal resistance, temperature, voltage, and leakage current of each single battery cell during the manufacturing process, this difference will cause inconsistent charging and discharging of each single battery cell in the battery pack. Specifically, it is manifested as overcharging or over-discharging of a certain single battery cell or some single battery cells. For a battery pack, its effective capacity is determined by these single battery cells with the weakest capacity. If the battery pack is in this abnormal charging and discharging state for a long time, it will exacerbate the parameter inconsistency between single battery cells, and then lead to a reduction in the capacity of the battery pack and inability to work properly. This will not only reduce the safety performance of the battery pack, but also greatly reduce the lifespan of the battery pack.

[0004] Therefore, to achieve the wide application of large-capacity battery packs, it is necessary to perform voltage equalization control on each single battery cell in the battery pack. Summary of the Invention

[0005] One object of the present application is to provide a new battery circuit, a control method for a battery circuit, a device, and a medium.

[0006] According to a first aspect of the present application, there is provided a battery circuit, including: an energy storage unit, at least one battery pack, and a processing unit, wherein:

[0007] For any one of the battery packs, the battery pack is connected in parallel across the two 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;

[0008] The processing unit is connected to the control end of the energy storage unit and the control end of any one of the first bridge arms, and is configured to control at least one first battery cell in at least one of the first bridge arms to be connected to the energy storage unit;

[0009] Wherein, the rated voltages of different first battery cells are the same.

[0010] Optionally, for any one of the battery packs, it further includes:

[0011] A first switch and a second switch, with 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 connected in sequence;

[0012] The processing unit is connected to the control ends of the first switch and the second switch.

[0013] Optionally, the first bridge arm further includes a third switch and a fourth switch, and any one of the first battery cells is connected in series with the third switch and then in parallel with the fourth switch;

[0014] The processing unit is connected to the control ends of the third switch and the fourth switch.

[0015] Optionally, for at least one battery pack, a second bridge arm is further included, the second bridge arm includes a second battery cell, and the processing unit is further configured to control the second battery cell in the second bridge arm to be connected to the energy storage unit.

[0016] Optionally, the first bridge arm is connected in parallel across the two ends of the energy storage unit, and the second bridge arm is connected in parallel across the two ends of the energy storage unit.

[0017] Optionally, for at least one battery pack, a seventh switch and an eighth switch are further included, and 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;

[0018] The second bridge arm includes at least two second battery cells connected in series;

[0019] The processing unit 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 of the second bridge arms to be connected to the energy storage unit.

[0020] Optionally, the battery circuit further includes a fifth switch and a sixth switch, where:

[0021] The first end of the energy storage unit, the fifth switch, the second bridge arm, and the second end of the energy storage unit are connected in sequence;

[0022] The first end of the energy storage unit, the first bridge arm, the sixth switch, and the second end of the energy storage unit are connected in sequence;

[0023] The processing unit is connected to the control ends of the fifth switch and the sixth switch.

[0024] Optionally, the fifth switch and the sixth switch are connected in series;

[0025] The first bridge arm and the second bridge arm are connected in series;

[0026] The connection between the fifth switch and the sixth switch is connected to the connection between the first arm and the second arm.

[0027] Optionally, the second arm further includes:

[0028] A ninth switch and a tenth switch, where any second battery cell is connected in series with the ninth switch and then in parallel with the tenth switch;

[0029] The processing unit is connected to the control terminals of the ninth switch and the tenth switch.

[0030] Optionally, the battery circuit further includes: a discharging unit, where:

[0031] The discharging unit is connected in parallel with the energy storage unit.

[0032] Optionally, the battery circuit further includes: an eleventh switch and a twelfth switch, where:

[0033] The first end of the energy storage unit, the eleventh switch, the discharging unit, the twelfth switch, and the second end of the energy storage unit are connected in sequence;

[0034] The processing unit is connected to the control terminals of the eleventh switch and the twelfth switch, and is used to control whether the discharging unit is connected to the energy storage unit.

[0035] According to a second aspect of the present application, there is provided a control method for a battery circuit, the method including:

[0036] When the voltage equalization condition within the arm is satisfied, controlling num1 first discharging battery cells in the first target arm to charge the energy storage unit;

[0037] When the voltage of the energy storage unit is the same as the voltage across the num1 first discharging battery cells, controlling the num1 first discharging battery cells in the first target arm to stop charging the energy storage unit;

[0038] Controlling the energy storage unit to charge num2 first charging battery cells in the first target arm;

[0039] Wherein, the battery circuit includes: an energy storage unit, a battery pack, the battery pack includes arms, and each arm includes at least two serially connected battery cells.

[0040] Optionally, the method further includes:

[0041] When the voltage of the energy storage unit is the same as the voltage across the num2 first charging battery cells, repeat the process of controlling the num1 first discharging battery cells in the first target leg 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 the first preset threshold.

[0042] Optionally, the number of battery cells in the first target leg is n, num1 is the same as num2. When n is an even number, num1 ≤ n / 2; when n is an odd number, num1 ≤ (n + 1) / 2.

[0043] Optionally, the method further includes:

[0044] 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, control the discharging unit to connect to the energy storage unit;

[0045] 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, control the discharging unit to disconnect from the energy storage unit;

[0046] Wherein, the battery circuit further includes a discharging unit.

[0047] Optionally, the method further includes:

[0048] When the condition of voltage balance between legs is met, control the num4 second discharging battery cells in the num3 second target legs to charge the energy storage unit;

[0049] When the voltage of the energy storage unit is the same as the voltage across the num4 second discharging battery cells, control the num4 second discharging battery cells to stop charging the energy storage unit;

[0050] Control the energy storage unit to charge the num6 second charging battery cells in the num5 third target legs.

[0051] Optionally, the method further includes: [[ID=3,2]]

[0052] Obtain the type of voltage balance;

[0053] When the type of voltage balance is intra-leg voltage balance, determine that the condition of intra-leg voltage balance is met;

[0054] When the type of voltage balance is inter-leg voltage balance, determine that the condition of inter-leg voltage balance is met.

[0055] According to a third aspect of the present application, there is provided an electronic device, which includes a battery circuit as described in any one of the first aspects;

[0056] Alternatively, the electronic device includes a memory and a processor. The memory is configured to store computer instructions, and the processor is configured to call the computer instructions from the memory to execute the method as described in any one of the second aspects.

[0057] According to a fourth aspect of the present application, there is provided a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the method as described in any one of the second aspects is implemented.

[0058] An embodiment of the present application provides a battery circuit, including: an energy storage unit, at least one battery pack, and a processing unit, where: for any one battery pack, the battery pack is connected in parallel across the two 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 one first bridge arm, and is configured 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. The battery circuit provided by the embodiment of the present application provides a hardware basis for voltage equalization control between battery cells.

[0059] Other features and advantages of the present application will become clear through the following detailed description of the exemplary embodiments of the present application with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] The drawings incorporated in the specification and constituting a part of the specification illustrate embodiments of the present application, and together with the description are used to explain the principles of the present application.

[0061] Figure 1 is a schematic structural diagram of a battery circuit provided by an embodiment of the present application Figure 1 ;

[0062] Figure 2 is a schematic structural diagram of a battery circuit provided by an embodiment of the present application Figure 2 ;

[0063] Figure 3 is a schematic structural diagram of a battery circuit provided by an embodiment of the present application Figure 3 ;

[0064] Figure 4 is a schematic structural diagram of a battery circuit provided by an embodiment of the present application Figure 4 ;

[0065] Figure 5It is a schematic diagram of the structure of a battery circuit provided by an embodiment of the present application Figure 5 ;

[0066] Figure 6 It is a schematic flowchart of a control method for a battery circuit provided by an embodiment of the present application;

[0067] Figure 7 It is a schematic diagram of the structure of an electronic device provided by an embodiment of the present application. Detailed implementation manners

[0068] Now, various exemplary embodiments of the present application will be described in detail with reference to the accompanying drawings. It should be noted that: unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present application.

[0069] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present application, its application, or its use.

[0070] Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and devices should be regarded as part of the specification.

[0071] In all the examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values.

[0072] It should be noted that: like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0073] <Embodiment of battery circuit>

[0074] The present application provides a battery circuit 10, as Figure 1 shown, the battery circuit 10 includes an energy storage unit 11, at least one battery pack 12, and a processing unit, where:

[0075] For any one of the battery packs 12, the battery pack 12 is connected in parallel across the energy storage unit 11, and the battery pack 12 includes a first bridge arm 122, and the first bridge arm 122 includes at least two first battery cells connected in series;

[0076] The processing unit is connected to the control end of the energy storage unit 11 and the control end of any one of the first bridge arms, and is configured 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;

[0077] Among them, the rated voltages of different first battery cells are the same.

[0078] In this embodiment, Figure 1 it is shown by taking a battery circuit 10 including a set of battery packs 12 as an example. And Figure 1 the processing unit is not shown.

[0079] The energy storage unit 11 is used to store and release electric energy. In one example, the energy storage unit 11 may specifically be a capacitor device or at least two capacitor devices connected in series. Figure 1 It is shown by taking 3 capacitors connected in series as an example. Among them, Figure 1 the 3 capacitors are respectively a battery 11a, a capacitor 11b, and a capacitor 11c.

[0080] When at least one battery pack 12 is at least two sets of battery packs 12, any battery pack 12 is connected in parallel across both ends of the energy storage unit 11.

[0081] For any set of battery packs 12, at least two first battery cells connected in series are included in its first bridge arm 122. Figure 1 It is shown by taking 4 first battery cells included in the first bridge arm 122 as an example, and the four first battery cells are specifically a first battery cell 1221a, a first battery cell 1221b, a first battery cell 1221c, and a first battery cell 1221d.

[0082] The processing unit is connected to the control end of the energy storage unit 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 the energy storage unit. In one example, the processing unit may exemplarily be an MCU.

[0083] Taking the example of a processing unit controlling two first battery cells in a battery pack to be connected to an energy storage unit, based on the above, it can be known that the processing unit controls two first battery cells in a first arm to be connected to the energy storage unit by controlling the energy storage unit and any battery pack. In this way, the two first battery cells in this first arm charge the energy storage unit. As the charging progresses, the voltages corresponding to the two first battery cells in this first arm decrease, and the voltage across the energy storage unit increases. When the voltages corresponding to the two first battery cells in this first arm are the same as the voltage across the energy storage unit, the two first battery cells in this first arm stop charging the energy storage unit. On this basis, the processing unit can release the stored energy in the energy storage unit to the other two first battery cells in this first arm, or the two first battery cells in another first arm by controlling the energy storage unit and the first arm. In this way, the voltages of the other two first battery cells in this first arm, or the two first battery cells in another first arm increase. Based on this principle, the voltage balance between the first battery cells in the battery circuit provided in the embodiments of the present application can be achieved. That is to say, the battery circuit provided in the embodiments of the present application provides a hardware basis for the voltage balance control between battery cells.

[0084] It should be noted that the rated voltages of the first single battery cells in the battery pack in the battery circuit provided in the embodiments of the present application are the same because when the battery pack in the battery circuit in the embodiments of the present application is produced, the specifications of each battery cell are the same. On this basis, based on the same energy storage unit, the voltage balance between the first single battery cells can be achieved.

[0085] In summary, the embodiments of the present application provide a battery circuit, including: an energy storage unit, at least one battery pack, and a processing unit, wherein: for any battery pack, the battery pack is connected in parallel across the energy storage unit, and the battery pack includes a first arm, and the first 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 arm, and is used to control at least one first battery cell in at least one first arm to be connected to the energy storage unit; wherein, the rated voltages of different first battery cells are the same. The battery circuit provided in the embodiments of the present application provides a hardware basis for the voltage balance control between battery cells.

[0086] In an embodiment of the present application, in order to enable the processing unit to control the connection of different battery packs to the energy storage unit, as Figure 2 shown, for any battery pack, it further includes:

[0087] a first switch and a second switch, the first end of the energy storage unit, the first switch, the first arm, the second switch, and the second end of the energy storage unit are connected in sequence;

[0088] The processing unit is connected to the control terminals of the first switch and the second switch.

[0089] It should be noted that Figure 2 in [description], there are at least three battery packs in one battery pack group, and these three battery packs are: battery pack 12a, battery pack 12b, and battery pack 12c.

[0090] Among them, for battery pack 12a, it includes a first switch 12a1, a first arm 12a2, and a second switch 12a3. For battery pack 12b, it includes a first switch 12b1, a first arm 12b2, and a second switch 12b3. For battery pack 12c, it includes a first switch 12c1, a first arm 12c2, and a second switch 12c3.

[0091] And, the first arm 12a2 includes a first battery cell 12a21a, a first battery cell 12a21b, a first battery cell 12a21c, and a first battery cell 12a21d. For the first arm 12b2, it includes a first battery cell 12b21a, a first battery cell 12b21b, a first battery cell 12b21c, and a first battery cell 12b21d. For the first arm 12c2, it includes a first battery cell 12c21a, a first battery cell 12c21b, a first battery cell 12c21c, and a first battery cell 12c21d.

[0092] In this embodiment, for any battery pack, when the processing unit controls the first switch and the second switch to conduct, the processing unit can control the battery pack to be connected to the energy storage unit. On the contrary, when the first switch and the second switch are controlled to be disconnected, the processing unit can control the battery pack not to be connected to the energy storage unit.

[0093] In an example, as Figure 2 shown, when the processing unit controls the first switch 12a1 and the second switch 12a3 to conduct, the processing unit can control the battery pack 12a to be connected to the energy storage unit. When the processing unit controls the first switch 12c1 and the second switch 12c3 to conduct, the processing unit can control the battery pack 12c to be connected to the energy storage unit.

[0094] In this embodiment, by setting a first switch and a second switch for each battery pack, the processing unit can select the battery pack connected to the energy storage unit.

[0095] In an embodiment of the present application, in order to enable the processing unit to control the connection of different first single cells in the first arm to the energy storage unit, as Figure 1 shown, the first 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;

[0096] The processing unit is connected to the control terminals of the third switch and the fourth switch.

[0097] Among them, taking Figure 1 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.

[0098] Combined with the above embodiments, the battery circuit provided by the embodiments of the present application can also be as Figure 2 shown. Taking Figure 2 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.

[0099] For the first bridge arm 12b2, the first battery cell 12b21a is connected in series with the third switch 12b22a, and the first battery cell 12b21a is connected in parallel with the fourth switch 12b23a. The first battery cell 12b21b is connected in series with the third switch 12b22b, and the first battery cell 12b21b is connected in parallel with the fourth switch 12b23b. The first battery cell 12b21c is connected in series with the third switch 12b22c, and the first battery cell 12b21c is connected in parallel with the fourth switch 12b23c. The first battery cell 12b21d is connected in series with the third switch 12b22d, and the first battery cell 12b21d is connected in parallel with the fourth switch 12b23d.

[0100] For the first arm 12c2, the first battery cell 12c21a is connected in series with the third switch 12c22a, and the first battery cell 12c21a is connected in parallel with the fourth switch 12c23a. The first battery cell 12c21b is connected in series with the third switch 12c22b, and the first battery cell 12c21b is connected in parallel with the fourth switch 12c23b. The first battery cell 12c21c is connected in series with the third switch 12c22c, and the first battery cell 12c21c is connected in parallel with the fourth switch 12c23c. The first battery cell 12c21d is connected in series with the third switch 12c22d, and the first battery cell 12c21d is connected in parallel with the fourth switch 12c23d.

[0101] In this embodiment, for any first arm, when the first switch and the second switch corresponding to the first arm are turned on, that is, when the first arm is connected to the energy storage unit, the processing unit controls the third switch connected in series with a first battery cell to be turned on and the fourth switch connected in parallel to be turned off, and the processing unit can control the first battery cell to be connected to the energy storage unit. On the contrary, when the third switch connected in series with the first battery cell is turned off and the fourth switch connected in parallel is turned on, the processing unit can control the first battery cell not to be connected to the energy storage unit.

[0102] In one example, as Figure 2 shown, for the first arm 12a2, when the processing unit controls the first switch 12a1 and the second switch 12a3 to be turned on, the processing unit 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, then the first battery cell 12a21c and the first battery cell 12a21d in the first arm 12a2 can be connected to the energy storage unit.

[0103] In this embodiment, by providing a third switch and a fourth switch for each first battery cell, the processing unit can select the first battery cell connected to the energy storage unit.

[0104] In an embodiment of the present application, as Figure 3 shown, for at least one battery pack, a second arm is further included, the second arm includes a second battery cell, and the processing unit is further configured to control the second battery cell in the second arm to be connected to the energy storage unit.

[0105] It should be noted that Figure 3 is in Figure 2On the basis of , the battery pack further includes: a second arm 12a5, a second arm 12b5, and a third arm 12c5. Further, for the second arm 12a5, it includes a second battery cell 12a51a, a second battery cell 12a51b, a second battery cell 12a51c, and a second battery cell 12a51d. For the second arm 12b5, it includes a second battery cell 12b51a, a second battery cell 12b51b, a second battery cell 12b51c, and a second battery cell 12b51d. For the second arm 12c5, it includes a second battery cell 12c51a, a second battery cell 12c51b, a second battery cell 12c51c, and a second battery cell 12c51d.

[0106] In this embodiment, through the setting of the second arm, more arms can be provided for the battery circuit.

[0107] In an embodiment of the present application, as Figures 2 to 5 The first arm is connected in parallel across both ends of the energy storage unit 11, and the second arm is connected in parallel across both ends of the energy storage unit 11.

[0108] In an embodiment of the present application, as Figure 3 As shown, for at least one battery pack, it further includes: a seventh switch and an eighth switch. The first end of the energy storage unit, the seventh switch, the second arm, the eighth switch, and the second end of the energy storage unit are connected in sequence;

[0109] The second arm includes at least two second battery cells connected in series;

[0110] The processing unit 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 arm to be connected to the energy storage unit.

[0111] It should be noted that Figure 3 is based on Figure 2 For the battery pack 12a, it further includes: a seventh switch 12a4 and an eighth switch 12a6. For the battery pack 12b, it further includes: a seventh switch 12b4 and an eighth switch 12b6. For the battery pack 12c, it further includes: a seventh switch 12c4 and an eighth switch 12c6.

[0112] In this embodiment, through the setting of the seventh switch and the eighth switch, on the basis that the battery pack includes the first arm, a corresponding second arm can be set. For example, for the battery pack 12a, by setting the seventh switch 12a4 and the eighth switch 12a6, a corresponding second arm 12a5 is set for the first arm 12a2, and this second arm 12a5 can be connected in parallel across both ends of the energy storage unit.

[0113] Further, based on the principle of the functions that can be achieved by the processing unit controlling the connection between at least one first battery cell in the first bridge arm and the energy storage unit, the processing unit controls the connection between at least one second battery cell in at least one second bridge arm and the energy storage unit by connecting the control terminals 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.

[0114] In an embodiment of the present application, as Figure 4 shown, the battery circuit 10 further includes a fifth switch 13 and a sixth switch 14, where:

[0115] 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;

[0116] 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;

[0117] The processing unit is connected to the control terminals of the fifth switch 13 and the sixth switch 14.

[0118] In the embodiment of the present application, by controlling the fifth switch 13 and the sixth switch 14, the processing unit can specifically control which first bridge arm and / or second bridge arm is connected to the energy storage unit.

[0119] In an example, when the processing unit controls the first switch 12a1, the second switch 12a3, and the sixth switch 14 to conduct, and other switches in the battery circuit are disconnected, the processing unit controls the first bridge arm 12a2 to be connected to the energy storage unit.

[0120] When the processing unit controls the seventh switch 12a4, the eighth switch 12a6, and the fifth switch 13 to conduct, and other switches in the battery circuit are disconnected, the processing unit controls the second bridge arm 12a5 to be connected to the energy storage unit.

[0121] In an embodiment of the present application, as Figure 4 shown, the fifth switch 13 and the sixth switch 14 are connected in series;

[0122] The first bridge arm and the second bridge arm are connected in series;

[0123] The connection point of the fifth switch 13 and the sixth switch 14 is connected to the connection point of the first bridge arm 12a2 and the second bridge arm 12a5.

[0124] Through this embodiment, while achieving the control of 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, the structural complexity of the battery circuit provided by the present application can be reduced. Moreover, connecting the first bridge arm and the second bridge arm in series can add more battery cells to the battery pack.

[0125] In one embodiment of the present application, in order to enable the processing unit to control the connection of different second monomer batteries in the second arm to the energy storage unit, as Figure 3 or Figure 4 shown, the second arm further includes:

[0126] A ninth switch and a tenth switch, where any second battery monomer is connected in series with the ninth switch and then in parallel with the tenth switch;

[0127] The processing unit is connected to the control terminals of the ninth switch and the tenth switch.

[0128] It should be noted that, based on Figure 3 or Figure 4 , the second battery monomer 12a51a is connected in series with the ninth switch 12a52a, and the second battery monomer 12a51a is connected in parallel with the tenth switch 12a53a. The second battery monomer 12a51b is connected in series with the ninth switch 12a52b, and the second battery monomer 12a51b is connected in parallel with the tenth switch 12a53b. The second battery monomer 12a51c is connected in series with the ninth switch 12a52c, and the second battery monomer 12a51c is connected in parallel with the tenth switch 12a53c. The second battery monomer 12a51d is connected in series with the ninth switch 12a52d, and the second battery monomer 12a51d is connected in parallel with the tenth switch 12a53d.

[0129] The second battery monomer 12b51a is connected in series with the ninth switch 12b52a, and the second battery monomer 12b51a is connected in parallel with the tenth switch 12b53a. The second battery monomer 12b51b is connected in series with the ninth switch 12b52b, and the second battery monomer 12b51b is connected in parallel with the tenth switch 12b53b. The second battery monomer 12b51c is connected in series with the ninth switch 12b52c, and the second battery monomer 12b51c is connected in parallel with the tenth switch 12b5३c. The second battery monomer 12b51d is connected in series with the ninth switch 12b52d, and the second battery monomer 12b51d is connected in parallel with the tenth switch 12b53d.

[0130] The second battery monomer 12c51a is connected in series with the ninth switch 12c52a, and the second battery monomer 12c51a is connected in parallel with the tenth switch 12c53a. The second battery monomer 12c51b is connected in series with the ninth switch 12c52b, and the second battery monomer 12c51b is connected in parallel with the tenth switch 12c53b. The second battery monomer 12c51c is connected in series with the ninth switch 12c52c, and the second battery monomer 12c51c is connected in parallel with the tenth switch 12c53c. The second battery monomer 12c51d is connected in series with the ninth switch 12c52d, and the second battery monomer 12c51c is connected in parallel with the tenth switch 12c53d.

[0131] In the embodiments of the present application, for any second bridge arm, when the seventh switch and the eighth switch 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 controls the ninth switch connected in series with a second battery cell to be turned on and the tenth switch connected in parallel to be turned off, and the processing unit can control the second battery cell to be connected to the energy storage unit. On the contrary, when the ninth switch connected in series with the second battery cell is turned off and the tenth switch connected in parallel is turned on, the processing unit can control the second battery cell to be disconnected from the energy storage unit.

[0132] Based on any of the above embodiments, the battery circuit 10 provided by the embodiments of the present application further includes a discharge unit 15 as shown in Figures 1 to 4 . Wherein:

[0133] The discharge unit 15 is connected in parallel with the energy storage unit 11.

[0134] In one embodiment, the discharge unit 15 may specifically be a resistor or other energy-consuming components.

[0135] In this embodiment, when the voltage equalization of the battery circuit is completed, the energy storage unit 11 is still charged. To avoid the energy storage unit 11 being charged, the processing unit consumes the electric energy on the energy storage unit by using the discharge unit 15 when the voltage equalization is completed, so as to avoid the energy storage unit being charged.

[0136] In one embodiment of the present application, the battery circuit provided by the embodiments of the present application further includes: an eleventh switch 16 and a twelfth switch 17. Wherein:

[0137] 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;

[0138] The processing unit 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.

[0139] In this embodiment, when the voltage equalization of the battery circuit is completed, the processing unit 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 on the energy storage unit 11.

[0140] Correspondingly, during the voltage equalization process of the battery circuit, the processing unit controls the eleventh switch 16 and the twelfth switch 17 to be turned off, 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.

[0141] In one embodiment of the present application, in any of the above battery circuits, when a certain arm in the battery pack is not energized, the arm can be removed. For example, in Figure 4 the battery circuit shown, when the first arm 12a2 is not energized, the first arm 12a2, the first switch 12a1, and the second switch 12a3 can be removed to obtain the battery circuit as shown in Figure 5 . Alternatively, when a certain battery cell is not energized, the battery cell can be removed.

[0142] Of course, a first arm or a second arm can also be added, and corresponding switches are arranged at both ends of the arm to be connected to both ends of the energy storage unit.

[0143] Combined with the above content, it can be seen that the battery circuit provided by the embodiment of the present application has high flexibility.

[0144] <Embodiment of the control method of the battery circuit>

[0145] The present application also provides a control method for a battery circuit. The battery circuit includes: an energy storage unit and a battery pack. The battery pack includes arms, and each arm includes at least two series-connected battery cells. The battery circuit can be specifically any of the battery circuits in the above battery circuit embodiments.

[0146] As Figure 6 shown, the control method of the battery circuit provided by the embodiment of the present application includes the following steps S61 to S63:

[0147] Step S61, when the voltage equalization condition within the arm is satisfied, control num1 first discharging battery cells in the first target arm to charge the energy storage unit.

[0148] In this embodiment, the voltage equalization condition within the arm refers to the condition for voltage equalization within the arm.

[0149] The first target arm can be any arm that needs to perform voltage equalization between battery cells within the arm in at least one battery pack. The first target arm can be a first arm or a second arm. When the first target arm is a first arm, the battery cells within the arm are specifically first battery cells. When the first target arm is a second arm, the battery cells within the arm are specifically second battery cells.

[0150] In this embodiment, the battery cells in the first target arm that charge the energy storage unit are denoted as first discharging battery cells.

[0151] In one example, an arm with a maximum voltage difference between battery cells greater than a first preset threshold can be used as the first target arm. The first preset threshold is the maximum allowable deviation of the voltage between battery cells when the battery cells in the arm are voltage-balanced. The first preset threshold can be set according to experience. Of course, it can also be determined in other ways, such as by manual specification.

[0152] In one embodiment of the present application, num1 first discharging battery cells in the first target arm are the first discharging battery cells in the first target arm that are ranked in the top num1 when sorted in descending order of the voltage across the two ends of the first discharging battery cells. Based on this, it can be known that the aforementioned num1 first discharging battery cells are the high-voltage battery cells in the first target arm.

[0153] By controlling the connection of num1 first discharging battery cells in the first target arm to the energy storage unit, it is possible to control the charging of the energy storage unit by the num1 first discharging battery cells in the first target arm.

[0154] Among them, the specific implementation method for controlling the connection of num1 first discharging battery cells in the first target arm to the energy storage unit can be: controlling the switches at both ends of the first target arm to conduct, and controlling the switches in series with the num1 first discharging battery cells in the first target arm to conduct, and the switches in parallel with the battery cells other than the num1 first discharging battery cells in the first target arm to conduct, and other switches to be off.

[0155] When the num1 first discharging battery cells in the first target arm charge the energy storage unit, the voltage across the two ends of the num1 first discharging battery cells in the first target arm decreases.

[0156] Step S62, when the voltage of the energy storage unit is the same as the voltage across the two ends of the num1 first discharging battery cells, control the num1 first discharging battery cells in the first target arm to stop charging the energy storage unit.

[0157] Step S63, control the energy storage unit to charge num2 first charging battery cells in the first target arm.

[0158] In this embodiment, num2 first charging battery cells in the first target arm are the battery cells in the first target arm that are ranked in the top num2 when sorted in ascending order of the voltage across the two ends of the battery cells. Based on this, it can be known that num2 first charging battery cells in the first target arm are the low-voltage battery cells in the first target arm. Among them, num1 and num2 can be the same or different.

[0159] When the voltage of the energy storage unit is the same as the voltage across the num1 first discharging battery cells, the energy storage unit is controlled to disconnect from the num1 first discharging battery cells, so as to control the num1 first discharging battery cells in the first target arm to stop charging the energy storage unit. At this time, the voltage across the energy storage unit is greater than the voltage across the num2 first charging battery cells in the first target arm, that is, there is a potential difference between the energy storage unit and the num2 first charging battery cells in the first target arm. Among them, the way to control the energy storage unit to disconnect from the num1 first discharging battery cells can be: controlling all switches to disconnect.

[0160] Further, by controlling the num2 first charging battery cells in the first target arm to be connected to the energy storage unit, based on the potential difference, the energy storage unit is enabled to charge the num2 first charging battery cells in the first target arm.

[0161] Among them, the way to control the num2 first charging battery cells in the first target arm to be connected to the energy storage unit can be: controlling the switches at both ends of the first target arm to conduct, the switches in series with the num2 first charging battery cells in the first target arm to conduct, and the switches in parallel with the battery cells other than the num2 first charging battery cells in the first target arm to conduct, and other switches to disconnect.

[0162] When the energy storage unit charges the num2 first charging battery cells in the first target arm, the voltage of the num2 first charging battery cells in the first target arm increases. In this way, the voltage balance within the arm can be achieved.

[0163] In an embodiment of the present application, the control method of the battery circuit provided by the embodiment of the present application further includes the following step S64.

[0164] Step S64, when the voltage of the energy storage unit is the same as the voltage across the num2 first charging battery cells, repeat the step of controlling the num1 first discharging battery cells in the first target 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 the first preset threshold.

[0165] In this embodiment, when the voltage of the energy storage unit is the same as the voltage across the num2 first charging battery cells, since the potential difference between the energy storage unit and the num2 first charging battery cells is 0, the energy storage unit cannot charge the num2 first charging battery cells anymore. At this time, repeating the above step S61 can control the num1 first discharging battery cells in the first target arm to continue charging the energy storage unit and the energy storage unit to continue charging the num2 first charging battery cells in the first target arm.

[0166] When the voltage difference between the voltages across the num1 first discharge battery cells and the voltages across the num2 first charge battery cells is less than or equal to the first preset threshold, the voltage balance between the battery cells in the first target bridge arm is achieved.

[0167] Based on this embodiment, the voltage balance between the battery cells in the first bridge arm can be completed.

[0168] In an embodiment of the present application, the number of battery cells in the first target bridge arm is n, num1 is the same as num2. When n is an even number, num1 ≤ n / 2; when n is an odd number, num1 ≤ (n + 1) / 2.

[0169] In this embodiment, based on the above limitations, it is possible to avoid a situation where the same battery cell in the first target bridge arm serves as both the first discharge battery cell and the first charge battery cell.

[0170] In an example, on the basis of the Figure 4 shown battery circuit example, if the first target bridge arm is the first bridge arm 12a2, and the first discharge battery cells are the first battery cell 12a21a and the first battery cell 12a21d respectively, and the first charge battery cells are the first battery cell 12a21b and the first battery cell 12a21c respectively. At this time, based on the above steps S61 to S64, control 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 to conduct, and the rest of the switches are turned off; at this time, the first battery cell 12a21a and the first battery cell 12a21d charge the energy storage unit 11.

[0171] When the voltage across the energy storage unit 11 is the same as the voltage across the series connection of the first battery cell 12a21a and the first battery cell 12a21d, turn off all the switches. At this time, the num1 first discharge battery cells in the first target bridge arm stop charging the energy storage unit; and control 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 to conduct, and the rest of the switches are turned off; at this time, the energy storage unit 11 charges the num2 first charge battery cells;

[0172] When the voltage of the energy storage unit 11 is the same as the voltage across the series connection of the first battery cells 12a21b and the first battery cell 12a21c, the third switch 12a22a, the fourth switch 12a23b, the fourth switch 12a23c, and the third switch 12a22d are re-controlled to conduct, 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 between the two ends of the series connection of the first battery cell 12a21a and the first battery cell 12a21d and the voltage across the series connection of the first battery cells 12a21b and the first battery cell 12a21c is less than or equal to the first preset threshold.

[0173] In an embodiment of the present application, the battery circuit further includes a discharging unit. On this basis, the control method of the battery circuit provided by the embodiment of the present application further includes the following steps S65 and step S66.

[0174] Step S65, when the voltage difference between the voltages across the num1 first discharging battery cells and the voltages across the num2 first charging battery cells is less than or equal to the first preset threshold, control the discharging unit to be connected to the energy storage unit.

[0175] In this embodiment, when the voltage difference between the voltages across the num1 first discharging battery cells and the voltages across the num2 first charging battery cells is less than or equal to the first preset threshold, it indicates that the voltage balance in the first target arm is completed. At this time, control the discharging unit to be connected to the energy storage unit. At this time, the discharging unit consumes the electric energy in the energy storage unit, which can prevent the energy storage unit from being charged. The way to control the discharging unit to be connected to the energy storage unit can be to control the eleventh switch 16 and the twelfth switch 17 in the battery circuit as Figures 1 to 4 shown to conduct.

[0176] Step S66, when the voltage difference between the voltages across the num1 first discharging battery cells and the voltages across the num2 first charging battery cells is greater than the first preset threshold, control the discharging unit to be disconnected from the energy storage unit.

[0177] Corresponding to the above step S66, when the voltage difference between the voltages across the num1 first discharging battery cells and the voltages across the num2 first charging battery cells is greater than the first preset threshold, it indicates that the voltage in the arm is not yet balanced. At this time, the energy storage unit still needs to be in a charged state. At this time, control the discharging unit to be disconnected from the energy storage unit.

[0178] Among them, the way to control the discharging unit to be disconnected from the energy storage unit can be to control the eleventh switch 16 and the twelfth switch 17 in the battery circuit as Figures 1 to 4 shown to be turned off.

[0179] In one embodiment of the present application, the control method of the battery circuit provided by the embodiment of the present application further includes the following steps S67 to S69.

[0180] Step S67, when the condition of voltage balance between arms is satisfied, control num4 second discharging battery monomers in num3 second target arms to charge the energy storage unit.

[0181] In this embodiment, the condition of voltage balance between arms refers to the condition for which voltage balance between arms needs to be performed.

[0182] The second target arm refers to any high-voltage arm for which voltage balance between arms needs to be performed.

[0183] Based on the Figure 4 example shown, the voltage balance between arms can specifically be the voltage balance between the first arms, the voltage balance between the second arms, or the voltage balance between the first arms and the second arms.

[0184] In one embodiment of the present application, num3 second target arms are the first num3 arms when sorted in descending order of the voltage at both ends of the arm. num3 is an integer greater than 0.

[0185] num4 second discharging battery monomers are the first num4 battery monomers in num3 second target arms when sorted in descending order of the voltage at both ends of the battery monomer. Based on this, it can be known that num4 second discharging battery monomers are the high-voltage battery monomers in num3 second target arms.

[0186] By controlling the connection mode between num4 second discharging battery monomers in num3 second target arms and the energy storage unit, it is possible to achieve charging of the energy storage unit by num4 second discharging battery monomers in num3 second target arms.

[0187] When num4 second discharging battery monomers charge the energy storage unit, the voltage at both ends of num4 second discharging battery monomers decreases.

[0188] Step S68, when the voltage of the energy storage unit is the same as the voltage at both ends of num4 second discharging battery monomers, control num4 second discharging battery monomers to stop charging the energy storage unit.

[0189] Step S69, control the energy storage unit to charge num6 second charging battery monomers in num5 third target arms.

[0190] In this embodiment, the third target arm refers to any low-voltage arm for which voltage balance between arms needs to be performed. The third target arm can be the first arm or the second arm.

[0191] In one embodiment of the present application, the num5 third target bridge arms are the bridge arms ranked in the top num5 when the voltages at both ends of the bridge arms are sorted from small to large.

[0192] The num6 second charging battery cells are the battery cells ranked in the top num6 among the num5 third target bridge arms when the voltages at both ends of the battery cells are sorted from small to large. Based on this, it can be known that the num6 second charging battery cells are the low-voltage battery cells among the num5 third target bridge arms.

[0193] The num4 second discharging battery cells can be controlled to disconnect from the energy storage unit to stop the num4 second discharging battery cells from charging the energy storage unit. And, the num6 second charging battery cells can be controlled to connect to the energy storage unit to enable the energy storage unit to charge the num6 second charging battery cells.

[0194] When the voltage of the energy storage unit is the same as the voltage across the num4 second discharging battery cells, control the num4 second discharging battery cells 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 charging battery cells, that is, there is a potential difference between the energy storage unit and the num6 second charging battery cells.

[0195] Furthermore, control the energy storage unit to connect to the num6 second charging battery cells, and based on the potential difference, enable the energy storage unit to charge the num6 second charging battery cells.

[0196] When the energy storage unit charges the num6 second charging battery cells, the voltages of the num6 second charging battery cells increase. In this way, the voltage balance between the bridge arms can be achieved.

[0197] 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.

[0198] Based on the embodiments of the above steps S67 to S69, the control method of the battery circuit provided by the embodiment of the present application further includes the following step S610.

[0199] Step S610, when the voltage of the energy storage unit is the same as the voltage across the num6 second charging battery cells, repeatedly control the num4 second discharging battery cells to charge the energy storage unit until the voltage difference between the voltages across the num4 second discharging battery cells and the num6 second charging battery cells is less than or equal to a second preset threshold.

[0200] Wherein, the second preset threshold is the maximum deviation of the voltage between the arms of the battery circuit allowed when the voltage between the arms of the battery circuit is balanced.

[0201] 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 elaborated here.

[0202] In an embodiment of the present application, the battery circuit further includes a discharge unit. On this basis, the control method of the battery circuit provided by the embodiment of the present application further includes the following steps S611 and S612.

[0203] Step S611, when the voltage difference between the voltages across the num4 second discharge battery cells and the voltages across the num6 second charge battery cells is less than or equal to the second preset threshold, control the discharge unit to be connected to the energy storage unit.

[0204] Step S612, when the voltage difference between the voltages across the num4 second discharge battery cells and the voltages across the num6 second charge battery cells is greater than the second preset threshold, control the discharge unit to be disconnected from the energy storage unit.

[0205] 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, and will not be elaborated here.

[0206] In an example, in Figure 4 Based on the example shown, if both num3 and num5 are 1, num4 and num6 are 2, and the second target arm is the first arm 12b2, the second discharge battery cells are the first battery cell 12b21a and the first battery cell 12b21d, the third target arm is the second 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 the above steps S67 to S610, control 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 to conduct, and the remaining switches to be disconnected. At this time, the num4 second discharge battery cells charge the energy storage unit 11;

[0207] When the voltage across the energy storage unit 11 is the same as the voltage across the series connection of num4 second discharge monomers, control all switches to open. At this time, the num4 second discharge battery monomers stop charging the energy storage unit; and, control 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 to conduct, and the rest of the switches to open; at this time, the energy storage unit 11 charges the num6 second charging battery monomers;

[0208] When the voltage of the energy storage unit 11 is the same as the voltage across the series connection of the second battery monomer 12a51a and the second battery monomer 12a51d, re-control 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 to conduct, and the rest of the switches to open, until the voltage across the num4 second discharge battery monomers and the num6 second charging battery monomers is less than the second preset threshold.

[0209] In another example, in Figure 4 Based on the example shown, if both num3 and num5 are 2, both num4 and num6 are 4, and the second target bridge arm is the first bridge arm 12a2 and the second bridge arm 12c5, and the third target bridge arm is the first bridge arm 12b2 and the second bridge arm 12a5, and the second discharge battery monomers are the first battery monomer 12a21b, the first battery monomer 12a21c, the second battery monomer 12c51b, and the second battery monomer 12c51c, and the second charging battery monomers are the first battery monomer 12b21a, the first battery monomer 12b21d, the second battery monomer 12a51a, and the second battery monomer 12a51d. At this time, based on the above steps S67 to step S610, control 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 to conduct, and the rest of the switches to open; at this time, the num4 second discharge battery monomers charge the energy storage unit 11;

[0210] When the voltage across the energy storage unit 11 is the same as the voltage across the num4 second discharge monomers connected in series, all switches are controlled to open; at this time, the num4 second discharge battery monomers 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 conduct; at this time, the energy storage unit 11 charges the num6 second charging battery monomers;

[0211] And, when the voltage of the energy storage unit 11 is the same as the voltage across the series connection of the first battery monomer 12b21a, the first battery monomer 12b21d, the second battery monomer 12a51a, and the second battery monomer 12a51d, 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 conduct, and the rest of the switches are open; until the voltage across the num4 second monomer discharge battery monomers and the num6 second charging battery monomers is less than the second preset threshold.

[0212] In one embodiment of the present application, the control method of the battery circuit provided by the embodiment of the present application further includes the following steps S613 to S615.

[0213] Step S613, obtain the voltage equalization type.

[0214] In one embodiment of the present application, the above step S613 can be specifically implemented in the following two ways.

[0215] The first is to manually input the voltage equalization type. Specifically, the technical personnel determine the voltage equalization type according to the test results of each battery monomer in the battery circuit.

[0216] The second is to formulate rules and determine the voltage equalization type according to the rules. Among them, the rules can be: when the voltage difference between battery monomers in a bridge arm is greater than the first preset threshold, the voltage equalization type is determined to be the in-bridge-arm voltage equalization type, and this bridge arm is used as the first target bridge arm. When the voltage difference between at least one bridge arm and at least one other bridge arm is greater than the second preset threshold, the voltage equalization type is determined to be the inter-bridge-arm voltage equalization. It should be noted that these rules can be set by the technical personnel according to experience.

[0217] Step S614, when the voltage equalization type is the in-arm voltage equalization, determine that the in-arm voltage equalization condition is satisfied.

[0218] Step S615, when the voltage equalization type is the between-arm voltage equalization, determine that the between-arm voltage equalization condition is satisfied.

[0219] <Embodiment of the electronic device>

[0220] This application also provides an electronic device, which includes any one of the battery circuits 10 provided in the above battery circuit embodiments.

[0221] Or, as Figure 7 shown, the electronic device 700 includes a memory 710 and a processor 720. The memory 610 is used to store computer instructions, and the processor 720 is used to call the computer instructions from the memory 710 to execute the control method of the battery circuit according to any one of the above battery circuit control method embodiments.

[0222] <Embodiment of the storage medium>

[0223] This application also provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, it implements the control method of the battery circuit according to any one of the above battery circuit control method embodiments.

[0224] This application may be a system, a method, and / or a computer program product. The computer program product may include a computer-readable storage medium, on which computer-readable program instructions are loaded for causing a processor to implement various aspects of this application.

[0225] The computer-readable storage medium may be a tangible device that can hold and store instructions used by an instruction execution device. The computer-readable storage medium may 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 of the above. More specific examples (non-exhaustive list) of the computer-readable storage medium 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 disc (DVD), a memory stick, a floppy disk, a mechanical encoding device, such as a punched card or raised structures in a groove storing instructions thereon, and any suitable combination of the above. The computer-readable storage medium used herein is not construed as an instantaneous signal itself, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagating through a waveguide or other transmission medium (e.g., optical pulses through an optical fiber cable), or electrical signals transmitted through wires.

[0226] The computer-readable program instructions described herein can be downloaded to various computing / processing devices from a computer-readable storage medium 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 may include copper transmission cables, optical fiber transmission, wireless transmission, routers, firewalls, switches, gateway computers, and / or edge servers. A 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 for storage in a computer-readable storage medium in each computing / processing device.

[0227] The computer program instructions for performing the operations of the present application may 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, including object-oriented programming languages—such as Smalltalk, C++, etc.—and conventional procedural programming languages—such as the "C" language or similar programming languages. The computer-readable program instructions may be executed entirely on the user's computer, partially on the user's computer, executed as a stand-alone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network—including a local area network (LAN) or a wide area network (WAN)—or, alternatively, may be connected to an external computer (e.g., via the Internet using an Internet service provider). In some embodiments, by using the state information of the computer-readable program instructions to customize an electronic circuit, such as a programmable logic circuit, a field-programmable gate array (FPGA), or a programmable logic array (PLA), the electronic circuit can execute the computer-readable program instructions to implement various aspects of the present application.

[0228] Aspects of the present application are described herein with reference to the flowcharts and / or block diagrams of methods, apparatuses (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.

[0229] These computer-readable program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, or other programmable data processing apparatus to produce a machine such that the instructions, when executed by the processor of the computer or other programmable data processing apparatus, create means for implementing the functions / acts specified in one or more boxes of the flowchart and / or block diagram. These computer-readable program instructions can also be stored in a computer-readable storage medium that causes a computer, a programmable data processing apparatus, and / or other devices to function in a particular manner, such that the computer-readable medium storing the instructions comprises a manufacture including instructions for implementing various aspects of the functions / acts specified in one or more boxes of the flowchart and / or block diagram.

[0230] The computer-readable program instructions may also be loaded onto a computer, other programmable data processing apparatus, or other device to cause a series of operational steps to be performed on the computer, other programmable data processing apparatus, or other device to produce a computer-implemented process such that the instructions executed on the computer, other programmable data processing apparatus, or other device implement the functions / acts specified in one or more boxes of the flowchart and / or block diagram.

[0231] The flowcharts and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of the present application. In this regard, each box in the flowchart or block diagram may represent a module, a segment of a program, or a portion of an instruction, and the module, segment of a program, or portion of an instruction contains one or more executable instructions for implementing the specified logical function. In some alternative implementations, the functions noted in the boxes may occur out of the order noted in the figures. For example, two consecutive boxes may in fact be executed substantially in parallel, or they may sometimes be executed in the reverse order, depending on the functions involved. It should also be noted that each box of the block diagrams and / or flowcharts, and combinations of boxes in the block diagrams and / or flowcharts, can be implemented by a dedicated hardware-based system that performs the specified functions or acts, or by a combination of dedicated hardware and computer instructions. It is well known to those skilled in the art that implementations by hardware, by software, and by a combination of software and hardware are equivalent.

[0232] The embodiments of the present application have been described above. The above description is exemplary and not exhaustive, and is also not limited to the disclosed embodiments. Many modifications and variations are obvious to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of the terms used herein is intended to best explain the principles of the embodiments, the practical application, or the technical improvements to the technology in the market, or to enable other ordinary skill in the art to understand the embodiments disclosed herein. The scope of the present application is defined by the appended claims.

Claims

1. A battery circuit, characterized in that, Comprising: An energy storage unit, at least one battery pack, and a processing unit, wherein: For any one battery pack, the battery pack is connected in parallel across the two 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 monomers connected in series; The processing unit is connected to the control terminal of the energy storage unit and the control terminal of any one of the first bridge arms, and is configured to control at least one first battery monomer in at least one of the first bridge arms to be connected to the energy storage unit; Wherein, the rated voltages of different first battery monomers are the same.

2. The battery circuit according to claim 1, wherein For any one battery pack, further comprising: 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 is connected to the control terminals of the first switch and the second switch.

3. The battery circuit according to claim 1, wherein The first bridge arm further includes a third switch and a fourth switch, any one of the first battery monomers is connected in series with the third switch, and after any one of the first battery monomers and the third switch are connected in series, they are connected in parallel with the fourth switch; The processing unit is connected to the control terminals of the third switch and the fourth switch.

4. The battery circuit according to claim 1, wherein For at least one battery pack, further comprising a second bridge arm, the second bridge arm includes a second battery monomer, and the processing unit is further configured to control the second battery monomer in the second bridge arm to be connected to the energy storage unit.

5. The battery circuit according to claim 4, characterized in that, The first bridge arm is connected in parallel across the two ends of the energy storage unit, and the second bridge arm is connected in parallel across the two ends of the energy storage unit.

6. The battery circuit according to claim 5, characterized in that, For at least one battery pack, further comprising: a seventh switch and an eighth switch, 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; The second bridge arm includes at least two second battery monomers connected in series; The processing unit is connected to the control terminals of the seventh switch and the eighth switch, and is further configured to control at least one second battery monomer in at least one of the second bridge arms to be connected to the energy storage unit.

7. The battery circuit according to claim 4, wherein The battery circuit further includes a fifth switch and a sixth switch, wherein: The first end of the energy storage unit, the fifth switch, the second bridge arm, and the second end of the energy storage unit are connected in sequence; The first end of the energy storage unit, the first bridge arm, the sixth switch, and the second end of the energy storage unit are connected in sequence; The processing unit is connected to the control terminals of the fifth switch and the sixth switch.

8. The battery circuit according to claim 7, wherein The fifth switch and the sixth switch are connected in series; The first bridge arm and the second bridge arm are connected in series; The connection point of the fifth switch and the sixth switch is connected to the connection point of the first bridge arm and the second bridge arm.

9. The battery circuit according to claim 4, characterized in that, The second bridge arm further includes: A ninth switch and a tenth switch, any one of the second battery monomers is connected in series with the ninth switch, and after any one of the second battery monomers and the ninth switch are connected in series, they are connected in parallel with the tenth switch; The processing unit is connected to the control terminals of the ninth switch and the tenth switch.

10. The battery circuit according to claim 1, characterized in that, The battery circuit further includes: a discharge unit, wherein: The discharge unit is connected in parallel with the energy storage unit.

11. The battery circuit according to claim 10, wherein The battery circuit further includes: an eleventh switch and a twelfth switch, wherein: The first end of the energy storage unit, the eleventh switch, the discharge unit, the twelfth switch, and the second end of the energy storage unit are connected in sequence; The processing unit is connected to the control ends of the eleventh switch and the twelfth switch, and is configured to control whether the discharge unit is connected to the energy storage unit.

12. A control method for a battery circuit, characterized in that, The method includes: When the condition of voltage balance within the arm is satisfied, controlling num1 first discharge battery monomers in the first target 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 monomers, controlling the num1 first discharge battery monomers in the first target arm to stop charging the energy storage unit; Controlling the energy storage unit to charge num2 first charging battery monomers in the first target arm; Wherein, the battery circuit includes: an energy storage unit, a battery pack, the battery pack includes arms, and each arm includes at least two serially connected battery monomers.

13. The method according to claim 12, wherein The method further includes: When the voltage of the energy storage unit is the same as the voltage across the num2 first charging battery monomers, repeating the step of controlling the num1 first discharge battery monomers in the first target arm to charge the energy storage unit until the voltage difference between the voltages across the num1 first discharge battery monomers and the num2 first charging battery monomers is less than or equal to a first preset threshold.

14. The method according to claim 12, characterized in that, The number of battery monomers in the first target arm is n, num1 is the same as num2. When n is an even number, num1 ≤ n / 2; when n is an odd number, num1 ≤ (n + 1) / 2.

15. The method according to claim 12, characterized in that, The method further includes: When the voltage difference between the voltages across the num1 first discharge battery monomers and the num2 first charging battery monomers is less than or equal to the first preset threshold, controlling the discharge unit to be connected to the energy storage unit; When the voltage difference between the voltages across the num1 first discharge battery monomers and the num2 first charging battery monomers is greater than the first preset threshold, controlling the discharge unit to be disconnected from the energy storage unit; Wherein, the battery circuit further includes a discharge unit.

16. The method according to claim 12, characterized in that The method further includes: When the condition of voltage balance between arms is satisfied, controlling num4 second discharge battery monomers in num3 second target arms 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 monomers, controlling the num4 second discharge battery monomers to stop charging the energy storage unit; Controlling the energy storage unit to charge num6 second charging battery monomers in num5 third target arms.

17. The method according to claim 16, characterized in that, The method further includes: Obtaining a voltage balance type; When the voltage balance type is voltage balance within the arm, determining that the condition of voltage balance within the arm is satisfied; When the voltage balance type is voltage balance between arms, determining that the condition of voltage balance between arms is satisfied.

18. An electronic device, characterized in that, The electronic device includes the battery circuit according to any one of claims 1-11; Alternatively, the electronic device includes a memory and a processor, the memory is used for storing computer instructions, and the processor is used for calling the computer instructions from the memory to execute the method according to any one of claims 12-17.

19. A computer-readable storage medium, characterized in that, A computer program is stored thereon, and when the computer program is executed by a processor, the method according to any one of claims 12-17 is implemented.

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