Equalization circuit, method and system, medium, controller and vehicle

Abstract

The invention relates to an equalization circuit, method and system, a medium, a controller and a vehicle. The equalization circuit comprises a first switch unit and an energy storage element, the first end of the first switch unit is connected with the positive electrode of a first battery pack, and the second end of the first switch unit is connected with the negative electrode of a second battery pack. The third end of the first switch unit is connected between the negative electrode of the first battery pack and the positive electrode of the second battery pack through the energy storage element, and the negative electrode of the first battery pack is connected with the positive electrode of the second battery pack; wherein at least one of the first switch unit and the energy storage element is an element in other functional circuits in the vehicle.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and more specifically, to a balancing circuit, a balancing circuit control method, a charging system, a power consumption system, a storage medium, a controller and a vehicle. Background Art

[0002] With the increasing awareness of environmental protection, new energy vehicles are gradually becoming popular. At present, new energy vehicles are usually equipped with multiple power battery packs to improve their endurance. However, there will be voltage imbalance in multiple battery packs, resulting in low battery charging efficiency and shortened battery life.

[0003] At present, voltage equalization of multiple battery packs is usually performed by adding an external equalization circuit, which increases the size and cost of the battery system. Therefore, it is necessary to provide a new equalization solution to reduce the size and cost of the battery system. Summary of the invention

[0004] One purpose of the embodiments of the present application is to provide a new solution for battery pack balancing.

[0005] According to a first aspect of the present application, there is provided a balancing circuit, comprising: a first switch unit and an energy storage element, wherein a first end of the first switch unit is connected to a positive electrode of a first battery pack, a second end of the first switch unit is connected to a negative electrode of a second battery pack, a third end of the first switch unit is connected between the negative electrode of the first battery pack and the positive electrode of the second battery pack through the energy storage element, and the negative electrode of the first battery pack is connected to the positive electrode of the second battery pack; wherein at least one of the first switch unit and the energy storage element is a component in other functional circuits in the vehicle.

[0006] Optionally, the first switch unit includes a first switch subunit and a second switch subunit, the first switch subunit has a first power, the second switch subunit has a second power,

[0007] The first switch subunit is used to control the first battery pack and the second battery pack to perform voltage balancing at a first power, and the second switch subunit is used to control the first battery pack and the second battery pack to perform voltage balancing at a second power.

[0008] Optionally, the first end of the first switch subunit and the first end of the second switch subunit are both connected to the positive electrode of the first battery pack, the second end of the first switch subunit and the second end of the second switch subunit are both connected to the negative electrode of the second battery pack, and the third end of the first switch subunit and the third end of the second switch subunit are both connected between the negative electrode of the first battery pack and the positive electrode of the second battery pack through the energy storage element.

[0009] Optionally, the energy storage element includes a first energy storage element and a second energy storage element.

[0010] The first end of the first switch subunit and the first end of the second switch subunit are both connected to the positive electrode of the first battery pack;

[0011] The second end of the first switch subunit and the second end of the second switch subunit are both connected to the negative electrode of the second battery pack.

[0012] The third end of the first switch subunit is connected between the negative electrode of the first battery pack and the positive electrode of the second battery pack through the first energy storage element;

[0013] The third end of the second switch subunit is connected between the negative electrode of the first battery pack and the positive electrode of the second battery pack through the second energy storage element.

[0014] Optionally, the power of the first switch subunit is greater than the power of the second switch subunit.

[0015] Optionally, a second switch unit is further included, and the energy storage element is connected between the negative electrode of the first battery pack and the positive electrode of the second battery pack through the second switch unit.

[0016] Optionally, a third switch unit and a fourth switch unit are further included, wherein the first end of the first switch unit is connected to the positive electrode of the first battery pack through the third switch unit, and the second end of the first switch unit is connected to the negative electrode of the second battery pack through the fourth switch unit.

[0017] Optionally, a DC bus capacitor is further included, which is connected in parallel between the first end of the first switch unit and the second end of the first switch unit and is used to smooth voltage fluctuations between the first end of the first switch unit and the second end of the first switch unit.

[0018] Optionally, the first switch unit is a switch unit of at least one of a motor controller, a compressor controller, and a voltage converter, and the energy storage element is an energy storage element of at least one of a motor and a voltage converter.

[0019] Optionally, the first switch unit includes a first bridge arm, the midpoint of the first bridge arm is connected between the negative electrode of the first battery pack and the positive electrode of the second battery pack through the energy storage element, the first end of the upper bridge arm of the first bridge arm is connected to the positive electrode of the first battery pack, the first end of the lower bridge arm of the first bridge arm is connected to the negative electrode of the second battery pack, and the second end of the upper bridge arm of the first bridge arm is connected to the second end of the lower bridge arm of the first bridge arm.

[0020] According to a second aspect of the present application, a method for controlling an equalizing circuit is provided, which is applied to the equalizing circuit as described in any one of the first aspects, and includes:

[0021] The first end of the first switch unit and the third end of the first switch unit are controlled to be connected, or the second end of the first switch unit and the third end of the first switch unit are controlled to be connected, so as to perform voltage balancing on the first battery pack and the second battery pack.

[0022] Optionally, the method further comprises:

[0023] Controlling the first battery pack and the second battery pack to perform voltage balancing at a first power through a first switch subunit;

[0024] The first battery pack and the second battery pack are controlled by the second switch subunit to perform voltage balancing at a second power.

[0025] Optionally, the method further comprises:

[0026] In the voltage balancing mode, controlling the second switch unit to be turned on;

[0027] In the battery discharging mode, the second switch unit is controlled to be turned off.

[0028] Optionally, controlling the first end of the first switch unit and the third end of the first switch unit to be connected comprises: controlling an upper bridge arm of a first bridge arm of the first switch unit to be turned on and a lower bridge arm of the first bridge arm of the first switch unit to be turned off;

[0029] The controlling the second end of the first switch unit and the third end of the first switch unit to be connected includes: controlling the upper bridge arm of the first bridge arm of the first switch unit to be cut off and the lower bridge arm of the first bridge arm of the first switch unit to be turned on.

[0030] Optionally, the method further comprises:

[0031] In the voltage balancing mode, controlling the second switch unit, the third switch unit and the fourth switch unit to be turned on;

[0032] In the battery discharging mode, the second switch unit is controlled to be turned off, and the third switch unit and the fourth switch unit are controlled to be turned on.

[0033] According to a third aspect of the present application, a charging system is provided, comprising the equalization circuit, the first battery pack, the second battery pack, and the charging input port as described in any one of the first aspects;

[0034] The positive electrode of the first battery pack and the negative electrode of the second battery pack are connected to the charging input port respectively.

[0035] According to a fourth aspect of the present application, there is provided an electric power system, comprising the balancing circuit as described in any one of the first aspects, a first battery pack, a second battery pack and a load.

[0036] According to a fifth aspect of the present application, a storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the method described in any one of the second aspects is implemented.

[0037] According to a sixth aspect of the present application, a controller is provided, comprising a memory and a processor.

[0038] The memory is used to store computer instructions, and the processor is used to call the computer instructions from the memory to execute the method as described in any one of the second aspects.

[0039] According to the seventh aspect of the present application, a vehicle is provided, comprising the balancing circuit as described in any one of the first aspect, or the system as described in the third aspect or the fourth aspect, or the storage medium as described in the fifth aspect, or the controller as described in the sixth aspect.

[0040] One beneficial effect of the embodiments of the present application is that the embodiments of the present application reuse switching units or energy storage elements in other functional circuits in the vehicle to achieve voltage balancing of the battery pack, which can reduce the size and cost of the battery system.

[0041] Further features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

[0043] Figure 1 It is a circuit diagram of an equalizing circuit provided according to an embodiment of the present application.

[0044] Figure 2 It is a circuit diagram of an equalizing circuit provided according to another embodiment of the present application.

[0045] Figure 3 It is a circuit diagram of an equalizing circuit provided according to another embodiment of the present application.

[0046] Figure 4 It is a circuit diagram of an equalizing circuit provided according to another embodiment of the present application.

[0047] Figure 5 It is a circuit diagram of an equalizing circuit provided according to another embodiment of the present application.

[0048] Figure 6 It is a circuit diagram of an equalizing circuit provided according to another embodiment of the present application.

[0049] Figure 7 It is a circuit diagram of an equalizing circuit provided according to another embodiment of the present application.

[0050] Figure 8 It is a circuit diagram of an equalizing circuit provided according to another embodiment of the present application.

[0051] Fig. 9 Schematic diagram of a charging system according to an embodiment of the present invention.

[0052] Fig.10 It is a schematic diagram of the structure of a controller provided according to an embodiment of the present application. DETAILED DESCRIPTION

[0053] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention unless otherwise specifically stated.

[0054] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0055] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0056] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0057] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0058] The embodiment of the present application reduces the volume of the battery system by reducing the volume of the balancing circuit. Figure 1 As shown, an embodiment of the present application provides a balancing circuit. The circuit may include a first switch unit 110 and an energy storage element 120. Among them, at least one of the first switch unit 110 and the energy storage element 120 is a component in other functional circuits in the vehicle.

[0059] In this embodiment, the first switch unit 110 and / or the energy storage element 120 may reuse elements in a power battery high voltage distribution system, or may reuse elements in a battery charging system.

[0060] As an example, the first switch unit 110 may be a switch unit of at least one of a motor controller, a compressor controller, and a voltage converter. For example, a switch unit formed by a three-phase bridge arm of a motor controller or a compressor controller. For another example, a switch unit formed by an inverter bridge arm of a voltage converter. In this example, the first switch unit 110 may be a power element. The energy storage element 120 may be an energy storage element of at least one of a motor and a voltage converter. For example, the coil inductance of a motor or the energy storage inductance of a voltage converter.

[0061] As an example, the first switch unit 110 is a motor controller, and the energy storage element 120 is a motor inductor. Alternatively, the first switch unit 110 is a switch unit of a voltage converter, and the energy storage element 120 is an energy storage inductor of the voltage converter. In this way, the existing circuit can be directly reused to simplify the design.

[0062] In this embodiment, the first end of the first switch unit 110 is connected to the positive electrode of the first battery pack BT1, the second end of the first switch unit 110 is connected to the negative electrode of the second battery pack, and the third end of the first switch unit 110 is connected between the negative electrode of the first battery pack and the positive electrode of the second battery pack through the energy storage element 120, and the negative electrode of the first battery pack is connected to the positive electrode of the second battery pack.

[0063] In this embodiment, the first battery pack and the second battery may each include a plurality of single cells. Preferably, the first battery pack and the second battery may each include an even number of single cells. This is more conducive to voltage balance of the first battery pack and the second battery pack.

[0064] In this embodiment, the first end of the first switch unit 110 and the third end of the first switch unit 110 can be controlled to be connected, or the second end of the first switch unit 110 and the third end of the first switch unit 110 can be controlled to be connected to balance the voltage of the first battery pack and the second battery pack.

[0065] Optionally, during the process of charging the battery packs in series, when the voltage of the first battery pack is greater than the voltage of the second battery pack, the first end of the first switch unit 110 and the third end of the first switch unit 110 can be controlled to be connected, so that only a part of the current input into the charging input port flows into the first battery pack, and the other part flows into the second battery pack after passing through the first and third ends of the first switch unit 110 and the energy storage element 120. In this way, part of the current flowing into the second battery pack is the current flowing into the negative electrode of the first battery pack, and part of the current flowing into the energy storage element 120, thereby achieving boosted and balanced charging of the second battery pack.

[0066] Similarly, when the voltage of the first battery pack is lower than the voltage of the second battery pack, the second end of the first switch unit 110 and the third end of the first switch unit 110 can be controlled to be connected, so that part of the current flowing out of the negative electrode of the first battery pack is diverted through the energy storage element 120, so that the current flowing into the second battery pack will be reduced, thereby achieving voltage reduction and balanced charging of the second battery pack.

[0067] Optionally, after the battery pack is charged, if the voltage of the first battery pack is greater than the voltage of the second battery pack, the first end of the first switch unit 110 and the third end of the first switch unit 110 can be controlled to be connected, so that the current flows from the positive electrode of the first battery pack through the first end and the third end of the first switch unit 110 to the energy storage element 120 for energy storage. Then, the second end of the first switch unit 110 and the third end of the first switch unit 110 can be controlled to be connected, so that the electric energy in the energy storage element 120 is used to balance charge the second battery pack.

[0068] In this embodiment, the first switch unit 110 may include a first bridge arm. The midpoint of the first bridge arm is connected between the negative electrode of the first battery pack and the positive electrode of the second battery pack through the energy storage element 120, the first end of the upper bridge arm of the first bridge arm is connected to the positive electrode of the first battery pack, the first end of the lower bridge arm of the first bridge arm is connected to the negative electrode of the second battery pack, and the second end of the upper bridge arm of the first bridge arm is connected to the second end of the lower bridge arm of the first bridge arm.

[0069] As an example, Figure 2 As shown, the upper bridge arm of the first bridge arm includes a power element V1, and the lower bridge arm of the first bridge arm includes a power element V2. The collector of the power element V1 is connected to the positive electrode of the first battery pack BT1, and the emitter of the power element V1 is connected to the first end of the inductor L. The collector of the power element V2 is connected to the first end of the inductor L, and the emitter of the power element V1 is connected to the negative electrode of the second battery pack BT2. The first end of the inductor L is connected between the emitter of the power element V1 and the collector of the power element V2, and the second end of the inductor L is connected between the negative electrode of the first battery pack and the positive electrode of the second battery pack.

[0070] In this embodiment, the upper bridge arm of the first bridge arm of the first switch unit 110 can be controlled to be turned on, and the lower bridge arm of the first bridge arm of the first switch unit 110 can be turned off to control the first end of the first switch unit 110 and the third end of the first switch unit 110 to be connected. The upper bridge arm of the first bridge arm of the first switch unit 110 can be controlled to be turned off, and the lower bridge arm of the first bridge arm of the first switch unit 110 can be turned on to control the second end of the first switch unit 110 and the third end of the first switch unit 110 to be connected.

[0071] The embodiment of the present application reuses the switch unit or energy storage element in other functional circuits in the vehicle to achieve voltage balancing of the battery pack, which can reduce the volume and cost of the battery system. In addition, the balancing circuit of this embodiment can be applied not only to the voltage balancing of the battery pack during the charging process, but also to the voltage balancing of the battery pack after the charging is completed, which is more flexible and universal.

[0072] In order to perform voltage balancing of the battery pack in a more refined manner, in some embodiments, multiple switch units of different powers can be used to achieve voltage balancing of different powers. Figure 3 As shown, the first switch unit 110 may include a first switch subunit 110A and a second switch subunit. The first switch subunit 110A is used to control the first battery pack and the second battery pack to perform voltage balancing at a first power. The second switch subunit is used to control the first battery pack and the second battery pack to perform voltage balancing at a second power.

[0073] In this embodiment, the first switch sub-unit 110A has a first power, and the second switch sub-unit has a second power.

[0074] In this embodiment, the first end of the first switch subunit 110A and the first end of the second switch subunit are both connected to the positive electrode of the first battery pack, the second end of the first switch subunit 110A and the second end of the second switch subunit are both connected to the negative electrode of the second battery pack, and the third end of the first switch subunit 110A and the third end of the second switch subunit are both connected between the negative electrode of the first battery pack and the positive electrode of the second battery pack through the energy storage element 120.

[0075] As an example, the first switch subunit 110A may be composed of a power element of a motor controller, and the second switch subunit may be composed of a power element of a voltage converter. In this example, since the power of the power element of the motor controller is greater than the power of the power element of the voltage converter, high-power voltage balancing of the battery pack can be achieved by controlling the first switch subunit 110A, and low-power voltage balancing of the battery pack can be achieved by controlling the second switch subunit.

[0076] Of course, more refined voltage balancing can be achieved by reusing multiple power components in other functional circuits of the vehicle, which will not be discussed here.

[0077] As an example, Figure 4 As shown, the first switch subunit 110A may include a three-phase bridge arm composed of switch elements V1, V2, V3, V4, V5, and V6. The second switch subunit may include two bridge arms composed of switch elements V7, V8, V9, and V10.

[0078] The embodiment of the present application controls switch units with different powers to perform voltage balancing on battery packs with different powers, thereby achieving refined voltage balancing.

[0079] In some embodiments, the switch unit and the energy storage element connected to the switch unit in other functional circuits of the vehicle can be directly reused. Figure 5 As shown, the energy storage element 120 may include a first energy storage element 120A and a second energy storage element 120B. The first end of the first switch subunit 110A and the first end of the second switch subunit are both connected to the positive electrode of the first battery pack. The second end of the first switch subunit 110A and the second end of the second switch subunit 110B are both connected to the negative electrode of the second battery pack. The third end of the first switch subunit 110A is connected between the negative electrode of the first battery pack and the positive electrode of the second battery pack through the first energy storage element 120A. The third end of the second switch subunit 110B is connected between the negative electrode of the first battery pack and the positive electrode of the second battery pack through the second energy storage element 120B.

[0080] As an example, the first switch subunit 110A is composed of a power element of a motor controller, the first energy storage element 120A is a coil inductance of the motor, and the second switch subunit 110B is composed of a power element of a voltage converter, and the second energy storage element 120B is an energy storage inductance of the voltage converter.

[0081] As an example, Figure 4 As shown, the first switch subunit 110A may be composed of power elements V1 and V2, and the first energy storage element 120A may be composed of inductor L1. Alternatively, the first switch subunit 110A may be composed of power elements V3 and V4, and the first energy storage element 120A may be composed of inductor L2. Alternatively, the first switch subunit 110A may be composed of power elements V5 and V6, and the first energy storage element 120A may be composed of inductor L3. The second switch subunit 110B may be composed of power elements V7 and V8, and the second energy storage element 120B may be composed of inductor L4. Alternatively, the second switch subunit 110B may be composed of power elements V9 and V10, and the second energy storage element 120B may be composed of inductor L5.

[0082] The embodiments of the present application can directly reuse the switch units and energy storage elements connected to the switch units in other functional circuits of the vehicle, thereby simplifying the circuit design and reducing the design cost.

[0083] Considering that the first switch unit 110 and the energy storage inductor reuse components of other functional circuits of the vehicle, they may not need to be connected between the first battery pack and the second battery pack when implementing other functions. Therefore, in some embodiments, Figure 6As shown, the balancing circuit may further include a second switch unit 130 , and the energy storage element is connected between the negative electrode of the first battery pack and the positive electrode of the second battery pack through the second switch unit 130 .

[0084] As an example, Figure 2 As shown, the second switch unit 130 may be a switch K2 connected to the inductor L. As another example, in the case where the energy storage element includes a first energy storage element 120A and a second energy storage element 120B, as shown in FIG. Figure 4 As shown, the second switch unit 130 may include a switch K2A connected to the inductor L4 or the inductor L5 and a switch K2B connected to the inductor L1, the inductor L2 or the inductor L3. Of course, in the case where the energy storage element includes the first energy storage element 120A and the second energy storage element 120B, the second switch unit 130 may also be an integrated switch, and the functions of the switch K2A and the switch K2B are realized by the integrated switch.

[0085] In this embodiment, in the voltage balancing mode, the second switch unit 130 can be controlled to be turned on. Specifically, in the voltage balancing mode, the switch K2A can be controlled to be turned on to perform voltage balancing on the first battery pack and the second battery pack at the second power. In the voltage balancing mode, the switch K2B can also be controlled to be turned on to perform voltage balancing on the first battery pack and the second battery pack at the first power.

[0086] In the battery discharge mode, the second switch unit 130 can be controlled to be turned off. Specifically, in the voltage balancing mode, the switch K2A can be controlled to be turned off so that the second switch subunit 110B can be used for other vehicle functions. In the voltage balancing mode, the switch K2B can also be controlled to be turned off so that the first switch subunit 110A can be used for other vehicle functions.

[0087] In the embodiment of the present application, a second switch unit is arranged between the energy storage element and the battery half pack, and the second switch unit is controlled to be turned on or off, so as to realize the balancing function and other vehicle functions respectively. In this way, the balancing function and other functions can be isolated.

[0088] In the embodiment of the present application, the first battery pack and the second battery pack are usually large battery packs connected in series. Figure 7 As shown, the balancing circuit may further include a third switch unit 140 and a fourth switch unit 150 , wherein the first end of the first switch unit 110 is connected to the positive electrode of the first battery pack through the third switch unit 140 , and the second end of the first switch unit 110 is connected to the negative electrode of the second battery pack through the fourth switch unit 150 .

[0089] As an example, Figure 4 As shown, the third switch unit 140 may be a switch K3. The fourth switch unit 150 may be a switch K4.

[0090] In this embodiment, in the voltage balancing mode, the second switch unit 130, the third switch unit 140 and the fourth switch unit 150 can be controlled to be turned on. In the battery discharging mode, the second switch unit 130 can be controlled to be turned off, and the third switch unit 140 and the fourth switch unit 150 can be controlled to be turned on.

[0091] The embodiment of the present application adds switch units at both ends of the positive and negative electrodes of the large battery pack to avoid the risk of electric shock caused by damage to the high-voltage wiring harness. At the same time, when the battery needs to be replaced or repaired, the switch unit can be controlled to be cut off to remove the battery pack more safely.

[0092] In some embodiments, Figure 8 As shown, the balancing circuit may further include a DC bus capacitor C, which is connected in parallel between the first end of the first switch unit 110 and the second end of the first switch unit 110, and is used to smooth the voltage fluctuation between the first end of the first switch unit 110 and the second end of the first switch unit 110.

[0093] In this embodiment, when the first switch unit 110 includes a first switch subunit 110A and a second switch subunit 110B, Figure 4 As shown, the DC bus capacitor may also include a first DC bus capacitor C1 and a second DC bus capacitor C2. The first DC bus capacitor C1 is used to smooth the voltage fluctuation of the first switch subunit 110A, and the second DC bus capacitor C2 is used to smooth the voltage fluctuation of the second switch subunit 110B. Of course, in the case where the first switch unit 110 includes the first switch subunit 110A and the second switch subunit 110B, the voltage fluctuation of the first switch subunit 110A and the second switch subunit 110B can be smoothed by only one DC bus capacitor.

[0094] The embodiment of the present application further provides a method for controlling an equalizing circuit, which is applied to the equalizing circuit in any of the above embodiments. The method may include step S100.

[0095] Step S100, controlling the first end of the first switch unit and the third end of the first switch unit to be connected, or controlling the second end of the first switch unit and the third end of the first switch unit to be connected, to perform voltage balancing on the first battery pack and the second battery pack.

[0096] In some embodiments, the equalization circuit control method of the embodiment of the present application may further include steps S110 to S120.

[0097] Step S110 , controlling the first battery pack and the second battery pack to perform voltage balancing at a first power through the first switch subunit.

[0098] Step S120: Control the first battery pack and the second battery pack to perform voltage balancing at a second power through the second switch subunit.

[0099] As an example, the voltage difference between the first battery pack and the second battery pack may be determined first. When the voltage difference is greater than a first voltage difference threshold, the first switch subunit controls the first battery pack and the second battery pack to perform voltage balancing at a first power. When the voltage difference is less than or equal to the first voltage difference threshold, the second switch subunit controls the first battery pack and the second battery pack to perform voltage balancing at a second power.

[0100] In some embodiments, the equalization circuit control method of the embodiment of the present application may further include step S130 to step S140.

[0101] Step S130: in the voltage balancing mode, controlling the second switch unit to be turned on.

[0102] Step S140: in the battery discharging mode, controlling the second switch unit to be turned off.

[0103] In step 100, controlling the first end of the first switch unit and the third end of the first switch unit to be connected includes: controlling the upper bridge arm of the first bridge arm of the first switch unit to be turned on and the lower bridge arm of the first bridge arm of the first switch unit to be turned off.

[0104] In step 100, controlling the second end of the first switch unit and the third end of the first switch unit to be connected includes: controlling the upper bridge arm of the first bridge arm of the first switch unit to be cut off and the lower bridge arm of the first bridge arm of the first switch unit to be turned on.

[0105] In some embodiments, the equalization circuit control method of the embodiment of the present application may further include steps S150 to S160.

[0106] Step S150, in the voltage balancing mode, controlling the second switch unit, the third switch unit and the fourth switch unit to be turned on.

[0107] Step S160: in the battery discharging mode, the second switch unit is controlled to be turned off, and the third switch unit and the fourth switch unit are controlled to be turned on.

[0108] The specific implementation of the method embodiment of the present application can refer to the control method in the equalization circuit embodiment, which will not be described in detail here.

[0109] The present application also provides a charging system. Fig. 9As shown, it includes a balancing circuit as described in any of the above embodiments, a first battery pack BT1, a second battery pack BT2 and a charging input port 160. The positive electrode of the first battery pack and the negative electrode of the second battery pack are connected to the charging input port 160 respectively.

[0110] In this embodiment, the positive electrode of the first battery pack can be connected to the charging input port 160 through the switch K5. The negative electrode of the second battery pack can be connected to the charging input port 160 through the switch K6.

[0111] In this embodiment, the charging input port may be a DC charging input port or an AC charging input port.

[0112] An embodiment of the present application further provides an electricity consumption system, comprising a balancing circuit as described in any one of the above embodiments, a first battery pack, a second battery pack, and a load.

[0113] The embodiment of the present application can integrate the equalization circuit, the charging circuit and the discharging circuit together.

[0114] An embodiment of the present application further provides a storage medium on which a computer program is stored. When the computer program is executed by a processor, the method described in any one of the above-mentioned equalization circuit control method embodiments is implemented.

[0115] The present application also provides a controller, such as Fig.10 As shown, the controller includes a memory 1100 and a processor 1200, the memory 1100 is used to store computer instructions, and the processor 1200 is used to call the computer instructions from the memory 1100 to execute any method as described in any one of the above-mentioned equalization circuit control method embodiments.

[0116] An embodiment of the present application also provides a vehicle, including the balancing circuit as described in the above embodiments, or the charging system, or the power consumption system, or the storage medium, or the controller 1000.

[0117] The present invention may be a system, a method and / or a 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 invention.

[0118] A computer-readable storage medium may be a tangible device that can hold and store instructions used by an instruction execution device. A 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 foregoing. More specific examples of computer-readable storage media (a non-exhaustive list) 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 disk 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 of the foregoing. As used herein, a computer-readable storage medium is not to be interpreted 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 a wire.

[0119] 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, optical fiber transmissions, wireless transmissions, 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 for storage in the computer-readable storage medium in each computing / processing device.

[0120] The computer program instructions for performing the operation of the present invention 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 "C" language or similar programming languages. Computer-readable program instructions may be executed entirely on a user's computer, partially on a user's computer, as an independent software package, partially on a user's computer, 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 via any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., using an Internet service provider to connect via the Internet). In some embodiments, an electronic circuit, such as a programmable logic circuit, a field programmable gate array (FPGA), or a programmable logic array (PLA), may be personalized by utilizing the state information of the computer-readable program instructions, and the electronic circuit may execute the computer-readable program instructions, thereby realizing various aspects of the present invention.

[0121] Various aspects of the present invention are described herein with reference to the flow charts and / or block diagrams of the methods, devices (systems) and computer program products according to embodiments of the present invention. It should be understood that each box of the flow chart and / or block diagram and the combination of each box in the flow chart and / or block diagram can be implemented by computer-readable program instructions.

[0122] 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 that implements the functions / actions specified in one or more boxes in the flowchart and / or block diagram is generated. These computer-readable program instructions can also be stored in a computer-readable storage medium, and these instructions cause the computer, programmable data processing device, and / or other equipment to work in a specific manner, so that the computer-readable medium storing the instructions includes a manufactured product, which includes instructions for implementing various aspects of the functions / actions specified in one or more boxes in the flowchart and / or block diagram.

[0123] Computer-readable program instructions may also be loaded onto a computer, other programmable data processing apparatus, or other device so that a series of operating 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 boxes in the flowchart and / or block diagram.

[0124] 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 invention. In this regard, each box in the flowchart or block diagram can represent a module, a program segment or a part of an instruction, and the module, a program segment or a part of an 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 a different order from the order 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 the flowchart, and the combination of the boxes in the block diagram and / or the 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 it is equivalent to implement it by hardware, implement it by software, and implement it by combining software and hardware.

[0125] Embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or technical improvements to the technology in the marketplace, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein. The scope of the present invention is defined by the appended claims.

Claims

1. An equalization circuit, characterized in that: include: a first switch unit and an energy storage element, wherein a first end of the first switch unit is connected to a positive electrode of a first battery pack, a second end of the first switch unit is connected to a negative electrode of a second battery pack, a third end of the first switch unit is connected between the negative electrode of the first battery pack and the positive electrode of the second battery pack through the energy storage element, and the negative electrode of the first battery pack is connected to the positive electrode of the second battery pack; Wherein, at least one of the first switch unit and the energy storage element is an element in other functional circuits in the vehicle.

2. The equalization circuit according to claim 1, characterized in that: The first switch unit includes a first switch subunit and a second switch subunit, the first switch subunit has a first power, and the second switch subunit has a second power. The first switch subunit is used to control the first battery pack and the second battery pack to perform voltage balancing at a first power, and the second switch subunit is used to control the first battery pack and the second battery pack to perform voltage balancing at a second power.

3. The equalizing circuit according to claim 2, characterized in that: The first end of the first switch subunit and the first end of the second switch subunit are both connected to the positive electrode of the first battery pack, the second end of the first switch subunit and the second end of the second switch subunit are both connected to the negative electrode of the second battery pack, and the third end of the first switch subunit and the third end of the second switch subunit are both connected between the negative electrode of the first battery pack and the positive electrode of the second battery pack through the energy storage element.

4. The equalizing circuit according to claim 2, characterized in that: The energy storage element comprises a first energy storage element and a second energy storage element, The first end of the first switch subunit and the first end of the second switch subunit are both connected to the positive electrode of the first battery pack; The second end of the first switch subunit and the second end of the second switch subunit are both connected to the negative electrode of the second battery pack. The third end of the first switch subunit is connected between the negative electrode of the first battery pack and the positive electrode of the second battery pack through the first energy storage element; The third end of the second switch subunit is connected between the negative electrode of the first battery pack and the positive electrode of the second battery pack through the second energy storage element.

5. The equalizing circuit according to claim 2, characterized in that: The power of the first switch subunit is greater than the power of the second switch subunit.

6. The equalization circuit according to claim 1, characterized in that: A second switch unit is also included, and the energy storage element is connected between the negative electrode of the first battery pack and the positive electrode of the second battery pack through the second switch unit.

7. The equalizing circuit according to claim 1, characterized in that: It also includes a third switch unit and a fourth switch unit, wherein the first end of the first switch unit is connected to the positive electrode of the first battery pack through the third switch unit, and the second end of the first switch unit is connected to the negative electrode of the second battery pack through the fourth switch unit.

8. The equalizing circuit according to claim 1, characterized in that: It also includes a DC bus capacitor, which is connected in parallel between the first end of the first switch unit and the second end of the first switch unit and is used to smooth the voltage fluctuation between the first end of the first switch unit and the second end of the first switch unit.

9. The equalizing circuit according to claim 1, characterized in that: The first switch unit is a switch unit of at least one of a motor controller, a compressor controller, and a voltage converter, and the energy storage element is an energy storage element of at least one of a motor and a voltage converter.

10. The equalizing circuit according to claim 1, characterized in that: The first switch unit includes a first bridge arm, a midpoint of the first bridge arm is connected between the negative electrode of the first battery pack and the positive electrode of the second battery pack through the energy storage element, a first end of the upper bridge arm of the first bridge arm is connected to the positive electrode of the first battery pack, a first end of the lower bridge arm of the first bridge arm is connected to the negative electrode of the second battery pack, and a second end of the upper bridge arm of the first bridge arm is connected to the second end of the lower bridge arm of the first bridge arm.

11. A method for controlling an equalizing circuit, characterized in that: The equalizer circuit according to any one of claims 1 to 10 comprises: The first end of the first switch unit and the third end of the first switch unit are controlled to be connected, or the second end of the first switch unit and the third end of the first switch unit are controlled to be connected, so as to perform voltage balancing on the first battery pack and the second battery pack.

12. The method according to claim 11, characterized in that The method further comprises: Controlling the first battery pack and the second battery pack to perform voltage balancing at a first power through a first switch subunit; The first battery pack and the second battery pack are controlled by the second switch subunit to perform voltage balancing at a second power.

13. The method according to claim 11, characterized in that The method further comprises: In the voltage balancing mode, controlling the second switch unit to be turned on; In the battery discharging mode, the second switch unit is controlled to be turned off.

14. The method according to claim 11, characterized in that The controlling the first end of the first switch unit and the third end of the first switch unit to be connected comprises: controlling the upper bridge arm of the first bridge arm of the first switch unit to be turned on and the lower bridge arm of the first bridge arm of the first switch unit to be turned off; The controlling the second end of the first switch unit and the third end of the first switch unit to be connected includes: controlling the upper bridge arm of the first bridge arm of the first switch unit to be cut off and the lower bridge arm of the first bridge arm of the first switch unit to be turned on.

15. The method according to claim 11, characterized in that The method further comprises: In the voltage balancing mode, controlling the second switch unit, the third switch unit and the fourth switch unit to be turned on; In the battery discharging mode, the second switch unit is controlled to be turned off, and the third switch unit and the fourth switch unit are controlled to be turned on.

16. A charging system, characterized in that: The device comprises a balancing circuit, a first battery pack, a second battery pack and a charging input port as claimed in any one of claims 1 to 10; The positive electrode of the first battery pack and the negative electrode of the second battery pack are connected to the charging input port respectively.

17. An electricity system, characterized in that: The device comprises the balancing circuit as claimed in any one of claims 1 to 10, a first battery pack, a second battery pack and a load.

18. A storage medium, characterized in that: A computer program is stored thereon, which implements the method according to any one of claims 11 to 15 when executed by a processor.

19. A controller, characterized in that: including memory and processor, The memory is used to store computer instructions, and the processor is used to call the computer instructions from the memory to execute the method according to any one of claims 11 to 15.

20. A vehicle, characterized in that: The device comprises the equalizing circuit according to any one of claims 1 to 10, or the system according to claim 16 or 17, or the storage medium according to claim 18, or the controller according to claim 19.

Images