Charge circuit, equalization circuit, methods, systems, controller, vehicle, and medium

Abstract

The present application relates to a charge circuit, an equalization circuit, methods, systems, a controller, a vehicle, and a medium. The charge circuit comprises: a first discharge port, a second discharge port and a first unidirectional switch, wherein the first unidirectional switch is connected between the first discharge port and the second discharge port, the first unidirectional switch is used for the unidirectional conduction between the first discharge port and the second discharge port, the first discharge port is configured to connect to a first battery pack, and the second discharge port is configured to connect to a second battery pack.

Description

Charging circuit, equalization circuit, method, system, controller, vehicle and medium

[0001] Cross Reference to Related Applications

[0002] This application claims priority to Chinese Patent Application No. 202410447523.4, filed on April 12, 2024, entitled “Charging circuit, equalization circuit, method, system, controller, vehicle and medium,” and Chinese Patent Application No. 202420765222.1, filed on April 12, 2024, entitled “Charging circuit, equalization circuit, system and vehicle,” the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0003] The present application relates to the technical field of battery, more particularly, to a charging circuit, a charging circuit control method, an equalization circuit, an equalization circuit control method, a charging system, a battery system, a power consumption system, a controller, a vehicle and a medium. BACKGROUND

[0004] With the increasing awareness of environmental protection, new energy vehicles are gradually popularized. At present, new energy vehicles usually configure multiple power battery packs to improve their endurance. During the charging of multiple battery packs, it is often necessary to switch the charging mode to adapt to different charging needs. For example, switching between multiple battery pack series-parallel charging modes. For another example, switching between multiple battery pack series charging mode and single battery pack charging mode. At present, when switching the charging mode, the connection between the charging circuit and the power supply needs to be disconnected first, and then the charging mode can be switched, otherwise a short circuit will occur.

[0005] However, when the connection between the charging circuit and the charging pile is disconnected during the switching of the charging mode, a sudden voltage will be generated at the power supply, which not only may trigger the protection strategy of the power supply itself and terminate the charging, but also may damage the contactor at the power supply end and the vehicle end. Therefore, it is necessary to provide a new charging scheme to avoid the above risks. SUMMARY

[0006] An object of embodiments of the present application is to provide a new battery pack charging and equalization scheme.

[0007] According to a first aspect of the present application, a charging circuit is provided, comprising: a first discharge port, a second discharge port and a first unidirectional switch, the first unidirectional switch being connected between the first discharge port and the second discharge port, the first unidirectional switch being used for unidirectional conduction between the first discharge port and the second discharge port, the first discharge port being used for connecting with a first battery pack, the second discharge port being used for connecting with a second battery pack.

[0008] Optionally, the charging circuit further comprises a charging port, a first switching unit and a second switching unit,

[0009] a first end of the first switching unit is connected to a first end of the charging port, a second end of the first switching unit is connected to the first discharging port, and a third end of the first switching unit is connected between the first unidirectional switch and the second discharging port;

[0010] a first end of the second switching unit is connected to a second end of the charging port, a second end of the second switching unit is connected between the first unidirectional switch and the first discharging port, and a third end of the second switching unit is connected to the second discharging port.

[0011] Optionally, the first switching unit comprises a first switch assembly, a second switch assembly and a pre-charge resistor, a first end of the pre-charge resistor is connected to the charging port, and a second end of the pre-charge resistor is connected to the first switch assembly and the second switch assembly respectively;

[0012] a first end of the first switch assembly is connected to the charging port, a second end of the first switch assembly is connected to the first discharging port, and a third end of the first switch assembly is connected to the second end of the pre-charge resistor;

[0013] a first end of the second switch assembly is connected to the charging port, a second end of the second switch assembly is connected between the second discharging port and the first unidirectional switch, and a third end of the second switch assembly is connected to the second end of the pre-charge resistor.

[0014] Optionally, the first switch assembly comprises a first switch and a second switch, the first switch is connected between the first end of the charging port and the first discharging port, and the second switch is connected between the second end of the pre-charge resistor and the first discharging port.

[0015] Optionally, the second switch assembly comprises a third switch and a fourth switch, a first end of the third switch is connected to the first end of the charging port, a second end of the third switch is connected between the first unidirectional switch and the second discharging port, a first end of the fourth switch is connected to the second end of the pre-charge resistor, and a second end of the fourth switch is connected between the first unidirectional switch and the second discharging port.

[0016] Optionally, the second switching unit comprises a fifth switch and a sixth switch;

[0017] a first end of the fifth switch is connected to a second end of the charging port, and a second end of the fifth switch is connected between the first unidirectional switch and the first discharging port;

[0018] The first end of the sixth switch is connected to the second end of the charging port, and the second end of the sixth switch is connected to the second discharging port.

[0019] Optionally, the charging circuit further comprises a switching switch connected between the first discharging port and the second discharging port.

[0020] Optionally, the charging circuit further comprises a second unidirectional switch connected between the second end of the first switching unit and the first discharging port; or,

[0021] The charging circuit further comprises a third unidirectional switch, a first end of the third unidirectional switch is connected to the third end of the first switching unit, and a second end of the third unidirectional switch is connected between the second discharging port and the first unidirectional switch; or,

[0022] The charging circuit further comprises a fourth unidirectional switch connected between the third end of the second switching unit and the second discharging port; or,

[0023] The charging circuit further comprises a fifth unidirectional switch, a first end of the fifth unidirectional switch is connected to the second end of the first switching unit, and a second end of the fifth unidirectional switch is connected between the first discharging port and the first unidirectional switch.

[0024] According to a second aspect of the present application, a charging circuit control method is provided, applied to the charging circuit as described in any one of the first aspect, comprising:

[0025] In the case that the charging circuit is switched from the first charging state to the second charging state, the first unidirectional switch is switched from unidirectional conduction to reverse disconnection;

[0026] The first charging state is that the first discharging port and the second discharging port are in series discharging; the second charging state is that the first discharging port and the second discharging port are in parallel discharging, or the second charging state is that the first discharging port is in single discharging or the second discharging port is in single discharging.

[0027] Optionally, the method further comprises:

[0028] In the case that the charging circuit is in the first charging state, the first end of the first switching unit and the second end of the first switching unit are in communication, and the first end of the second switching unit and the third end of the second switching unit are in communication.

[0029] Optionally, the method further comprises:

[0030] In a case where the charging circuit is in the second charging state, the first end of the first switching unit and the second end of the first switching unit are in communication, and the first end of the second switching unit and the second end of the second switching unit are in communication; and / or,

[0031] The first end of the first switching unit and the third end of the first switching unit are in communication, and the first end of the second switching unit and the third end of the second switching unit are in communication.

[0032] Optionally, the second charging state is pre-discharge of the first discharge port and / or the second discharge port.

[0033] The communication between the first end of the first switching unit and the second end of the first switching unit includes:

[0034] The second switch is turned on, and the first switch is turned off.

[0035] The communication between the first end of the first switching unit and the third end of the first switching unit includes:

[0036] The fourth switch is turned on, and the third switch is turned off.

[0037] Optionally, the method further includes:

[0038] In a case where the first voltage is greater than the first vehicle voltage and the first voltage is less than the second vehicle voltage, the charging circuit is in the second charging state.

[0039] In a case where the first voltage is greater than the first vehicle voltage and the first voltage is less than the second vehicle voltage, the charging circuit is in the second charging state.

[0040] The first voltage is the voltage output by the power supply, the first vehicle voltage is the voltage of the vehicle when the battery packs are connected in parallel, and the second vehicle voltage is the voltage of the vehicle when the battery packs are connected in series.

[0041] According to a third aspect of the present application, an equalization circuit is provided, including: a switching unit, the switching unit being connected to a first battery pack and a second battery pack at both ends, and the switching unit being used for voltage equalization of the first battery pack and the second battery pack; and the switching unit being further used for discharging of the first battery pack and / or the second battery pack.

[0042] Optionally, the first end of the switching unit is connected to the first end of the first battery pack, the second end of the switching unit is connected to the first end of the second battery pack, and the second end of the first battery pack is connected to the second end of the second battery pack.

[0043] Optionally, the switching unit comprises an eighth switch, a ninth switch and a first resistor, the eighth switch is connected between the first end of the switching unit and the second end of the switching unit, and the ninth switch and the first resistor are connected in series between the first end of the switching unit and the second end of the switching unit.

[0044] Optionally, the switching unit further comprises a tenth switch, an eleventh switch and a second resistor, the eleventh switch and the second resistor are connected in parallel with the tenth switch after being connected in series.

[0045] The eighth switch, the ninth switch and the first resistor constitute a first switching unit, the tenth switch, the eleventh switch and the second resistor constitute the second switching unit, and the first switching unit and the second switching unit are connected in series to constitute the switching unit.

[0046] Optionally, the first resistor is greater than the second resistor.

[0047] Optionally, the equalization circuit further comprises an output end, the third end of the switching unit is further used for connecting the output end, and the output end is used for discharging a load.

[0048] Optionally, the equalization circuit further comprises a switching switch, and the switching switch is connected between the first battery pack and the second battery pack.

[0049] According to a fourth aspect of the present application, an equalization circuit control method is provided, applied to the equalization circuit of any one of the third aspect, comprising:

[0050] In the voltage equalization mode, the switching unit is connected between the first battery pack and the second battery pack, and the first battery pack and the second battery pack are subjected to voltage equalization;

[0051] In the battery discharge mode, the switching unit is used for connecting the first battery pack and / or the second battery pack with an output end, so that the first battery pack and / or the second battery pack are discharged.

[0052] Optionally, the method further comprises:

[0053] determining a voltage difference between the first battery pack and the second battery pack;

[0054] In the case where the voltage difference is greater than a first voltage difference threshold, the eighth switch is turned on and the ninth switch is turned off, or the tenth switch is turned on and the eleventh switch is turned off;

[0055] In the case where the voltage difference is less than or equal to the first voltage difference threshold, the eighth switch is turned off and the ninth switch is turned on, or the tenth switch is turned off and the eleventh switch is turned on.

[0056] Optionally, the method further comprises:

[0057] determining a voltage difference between the first battery pack and the second battery pack;

[0058] in a case that the voltage difference is greater than a first voltage difference threshold, the eighth switch is turned on, the ninth switch is turned off, the tenth switch is turned on, and the eleventh switch is turned off.

[0059] Optionally, in a case that the resistance of the first resistor is greater than the resistance of the second resistor, the method further comprises:

[0060] in a case that the voltage difference is less than or equal to the first voltage difference threshold and greater than a second voltage difference threshold, the eighth switch is turned on, the ninth switch is turned off, the tenth switch is turned off, and the eleventh switch is turned on;

[0061] in a case that the voltage difference is less than or equal to the second voltage difference threshold and greater than a third voltage difference threshold, the eighth switch is turned off, the ninth switch is turned on, the tenth switch is turned on, and the eleventh switch is turned off;

[0062] wherein the first voltage difference threshold is greater than the second voltage difference threshold, and the second voltage difference threshold is greater than the third voltage difference threshold.

[0063] Optionally, in a case that the resistance of the first resistor is equal to the resistance of the second resistor, the method further comprises:

[0064] in a case that the voltage difference is less than or equal to the first voltage difference threshold and greater than the third voltage difference threshold, the eighth switch and the eleventh switch are turned on and the ninth switch and the tenth switch are turned off, or the eighth switch and the eleventh switch are turned off and the ninth switch and the tenth switch are turned on;

[0065] wherein the first voltage difference threshold is greater than the third voltage difference threshold.

[0066] Optionally, the method further comprises:

[0067] in a case that the voltage difference is less than or equal to the third voltage difference threshold, the eighth switch is turned off, the ninth switch is turned on, the tenth switch is turned off, and the eleventh switch is turned on.

[0068] According to a fifth aspect of the present application, there is provided a charging system comprising the charging circuit according to any one of the first aspect.

[0069] According to a sixth aspect of the present application, there is provided a battery system comprising the equalization circuit according to any one of the third aspect, the first battery pack, and the second battery pack.

[0070] According to a seventh aspect of the present application, a power utilization system is provided, comprising the battery system according to the sixth aspect and a load.

[0071] According to an eighth aspect of the present application, a controller is provided, comprising a memory and a processor,

[0072] The memory is configured to store computer instructions, and the processor is configured to invoke the computer instructions from the memory to execute the method according to any one of the second aspect, or the method according to any one of the fourth aspect.

[0073] According to a ninth aspect of the present application, a vehicle is provided, comprising the controller according to the eighth aspect.

[0074] According to a tenth aspect of the present application, a storage medium is provided, having stored thereon a computer program which, when executed by a processor, implements the method according to any one of the second aspect, or the method according to any one of the fourth aspect.

[0075] An advantage of the embodiments of the present application is that, by arranging the unidirectional switch between the first discharge port and the second discharge port, the first discharge port and the second discharge port are unidirectionally conducted and bidirectionally disconnected when the charging mode is switched. In this way, when the charging mode is switched, the charging circuit does not need to be disconnected from the power supply first, thereby avoiding the risk of triggering the self-protection strategy due to voltage mutation of the power supply, terminating the charging, and damaging the contactor of the power supply and the vehicle.

[0076] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments of the present application with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0077] The accompanying drawings incorporated in and forming a part of the specification illustrate embodiments of the present application and, together with the description, serve to explain the principles of the present application.

[0078] FIG. 1 is a circuit schematic diagram of a charging circuit according to an embodiment of the present application.

[0079] FIG. 2 is a circuit schematic diagram of a charging circuit according to another embodiment of the present application.

[0080] FIG. 3 is a circuit schematic diagram of a charging circuit according to yet another embodiment of the present application.

[0081] FIG. 4 is a flowchart of a charging circuit control method according to an embodiment of the present application.

[0082] FIG. 5 is a circuit schematic diagram of an equalization circuit according to an embodiment of the present application.

[0083] FIG. 6 is a circuit schematic diagram of an equalization circuit according to another embodiment of the present application.

[0084] FIG. 7 is a circuit schematic diagram of an equalization circuit according to yet another embodiment of the present application.

[0085] FIG. 8 is a flowchart of a control method of an equalization circuit according to an embodiment of the present application.

[0086] FIG. 9 is a circuit schematic diagram of an integrated charging circuit and equalization circuit according to another embodiment of the present application.

[0087] FIG. 10 is a structural schematic diagram of a power utilization system according to an embodiment of the present application.

[0088] FIG. 11 is a structural schematic diagram of a controller according to an embodiment of the present application.

[0089] Reference Signs:

[0090] 100: first discharge port; 110: second discharge port; 120: first unidirectional switch; 130: charging port; 140: first switching unit; 150: second switching unit; 160: switching switch; 200: switching unit; BT1: first battery pack; BT2: second battery pack. DETAILED DESCRIPTION

[0091] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of the components and steps set forth in the embodiments, numerical expressions, and numerical values are not limiting to the scope of the present application unless specifically stated otherwise.

[0092] The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the scope of the application, its application, or uses. Techniques, methods, and devices known to those of ordinary skill in the art can not be discussed in detail, but should be understood to be a part of the specification, where appropriate.

[0093] In all the examples shown and discussed herein, any specific values should be interpreted as merely exemplary, and not as a limitation. Thus, other examples of the exemplary embodiments can have different values. It should be noted that like reference numerals and letters refer to like items in the following drawings, and thus, once an item is defined in one drawing, it need not be discussed further in subsequent drawings.

[0094] The system of the embodiment of the present application can be applied to the charging and discharging scene of the electric vehicle. In the charging scene, it can be applied to wireless charging or wired charging. The charging can be performed on the multiple battery packs in series or the multiple battery packs in parallel. After one of the battery packs is fully charged, the charging can be continued for the other battery packs. In the discharging scene, the load can be powered by the multiple battery packs in series or one of the battery packs. The system of the embodiment of the present application can include a charging system or a power consumption system. The charging system can include a charging circuit. The power consumption system can include an equalization circuit, a battery pack, and a load.

[0095] The embodiment of the present application considers the problem that the charging circuit needs to be disconnected from the power supply before switching the charging mode, and proposes a new charging circuit. As shown in FIG. 1, the charging circuit includes a first discharge port 100, a second discharge port 110, and a first one-way switch 120. The first one-way switch 120 is connected between the first discharge port 100 and the second discharge port 110, and is used for one-way conduction between the first discharge port 100 and the second discharge port 110. The first discharge port 100 is used for connecting with a first battery pack, and the second discharge port 110 is used for connecting with a second battery pack.

[0096] The working state of the charging circuit of the embodiment of the present application can include a first charging state and a second charging state. The first charging state is that the first discharge port 100 and the second discharge port 110 are in series discharge. The second charging state is that the first discharge port 100 and the second discharge port 110 are in parallel discharge. Alternatively, the second charging state is that the first discharge port 100 is discharged alone or the second discharge port 110 is discharged alone.

[0097] In the embodiment, the first discharge port 100 is used for connecting with the first battery pack. The first discharge port 100 can be understood as two ports connected with the positive and negative electrodes of the first battery pack. In one example, the first discharge port can be two ports 100 as shown in FIG. 1. The first battery pack is discharged through the first discharge port 100.

[0098] Similarly, the second discharge port 110 is used for connecting with the second battery pack. The second discharge port 110 can be understood as two ports connected with the positive and negative electrodes of the second battery pack. In one example, the second discharge port can be two ports 110 as shown in FIG. 1. The second battery pack is discharged through the second discharge port 110.

[0099] In the embodiment, the first one-way switch 120 can be any element with one-way conduction function, for example, a diode. Herein, no specific limitation is made.

[0100] In this embodiment, the first one-way switch 120 is connected between the first discharge port 100 and the second discharge port 110. In one example, the first one-way switch 120 is connected between the first discharge port 100 connected to the negative electrode of the first battery pack and the second discharge port 110 connected to the positive electrode of the second battery pack.

[0101] In this embodiment, when the charging circuit is switched from the first charging state to the second charging state, the first one-way switch 120 is switched from one-way conduction to reverse disconnection.

[0102] In this embodiment, by arranging the one-way switch between the first discharge port and the second discharge port, when the charging mode is switched, the first discharge port and the second discharge port are one-way conduction and reverse disconnection. In this way, when the charging circuit is switched, the connection between the charging circuit and the power supply does not need to be disconnected first, thereby avoiding the risk of triggering the self-protection strategy of the power supply due to voltage mutation of the power supply, terminating the charging, and damaging the contactor of the power supply itself and the vehicle end.

[0103] In some embodiments, as shown in FIG. 2, the charging circuit further includes a switching switch 160 connected between the first discharge port 100 and the second discharge port 110.

[0104] In this embodiment, the switching switch 160 can be any switching device, such as a contactor or a relay, etc. By controlling the conduction and cutoff of the switching switch 160, the charging circuit can be switched between the first charging state and the second charging state. As an example, as shown in FIG. 3, the switching switch 160 can be, for example, a switch K7.

[0105] In this embodiment, by arranging the one-way switch between the first discharge port and the second discharge port of the charging circuit, when the charging mode is switched, the first discharge port and the second discharge port are one-way conduction and reverse disconnection. When the charging circuit is switched from the first charging mode to the second charging mode, the circuit corresponding to the second charging mode can be directly connected without first disconnecting the switching switch. In this way, the connection between the charging circuit and the power supply will not be disconnected, thereby avoiding the risk of triggering the self-protection strategy of the power supply due to voltage mutation of the power supply, terminating the charging, and damaging the contactor of the power supply itself and the vehicle end. Moreover, even if the switching switch is damaged, the circuit will not have the risk of short circuit. In addition, the one-way switch and the switching switch work together to further achieve double protection.

[0106] In some embodiments, as shown in FIG. 1, the charging circuit can further include a charging port 130, a first switching unit 140, and a second switching unit 150. A first end of the first switching unit 140 is connected to a first end of the charging port 130, a second end of the first switching unit 140 is connected to the first discharging port 100, and a third end of the first switching unit 140 is connected between the first unidirectional switch 120 and the second discharging port 110. A first end of the second switching unit 150 is connected to a second end of the charging port 130, a second end of the second switching unit 150 is connected between the first unidirectional switch 120 and the first discharging port 100, and a third end of the second switching unit 150 is connected to the second discharging port 110.

[0107] In the present embodiment, the first end of the charging port 130 and the second end of the charging port 130 can be two ends of the charging circuit connected to the positive and negative poles of the power supply, respectively.

[0108] In one example, the first end of the charging port 130 can be a positive terminal, and the second end of the charging port 130 can be a negative terminal. The second end of the first switching unit 140 is connected to the first discharging port 100 connected to the positive pole of the first battery pack. The third end of the first switching unit 140 is connected between the first unidirectional switch 120 and the second discharging port 110 connected to the positive pole of the second battery pack. The second end of the second switching unit 150 is connected between the first unidirectional switch 120 and the first discharging port 100 connected to the negative pole of the first battery pack. The third end of the second switching unit 150 is connected to the second discharging port 110 connected to the negative pole of the second battery pack.

[0109] In the case where the charging circuit of the present embodiment is in the first charging state, the first end of the first switching unit 140 and the second end of the first switching unit 140 are connected, and the first end of the second switching unit 150 and the third end of the second switching unit 150 are connected.

[0110] The second charging state can be that the first discharging port and the second discharging port are connected in parallel for discharging. In the case where the charging circuit of the present embodiment is in the second charging state, the first end of the first switching unit 140 and the second end of the first switching unit 140 are connected, the first end of the second switching unit 150 and the second end of the second switching unit 150 are connected, the first end of the first switching unit 140 and the third end of the first switching unit 140 are connected, and the first end of the second switching unit 150 and the third end of the second switching unit 150 are connected. In the present embodiment, in the case where the charging circuit is switched from the first charging state to the second charging state, after the first unidirectional switch is switched from unidirectional conduction to reverse disconnection, the first end of the first switching unit and the third end of the first switching unit are connected, and the first end of the second switching unit and the second end of the second switching unit are connected first and then disconnected.

[0111] The second charging state can also be to separately discharge the first discharge port. In the case where the charging circuit of the embodiment is in the second charging state, the first end of the first switching unit 140 and the second end of the first switching unit 140 are connected, and the first end of the second switching unit 150 and the second end of the second switching unit 150 are connected. In the embodiment, in the case where the charging circuit is switched from the first charging state to the second charging state, after the first unidirectional switch is switched from unidirectional conduction to reverse disconnection, the first end of the first switching unit 140 and the second end of the first switching unit 140 are connected, the first end of the second switching unit 150 and the second end of the second switching unit 150 are connected, then the switching switch is disconnected, and the connection between the first end of the second switching unit 150 and the third end of the second switching unit 150 is disconnected.

[0112] The second charging state can also be to separately discharge the second discharge port. In the case where the charging circuit of the embodiment is in the second charging state, the first end of the first switching unit 140 and the third end of the first switching unit 140 are connected, and the first end of the second switching unit 150 and the third end of the second switching unit 150 are connected. In the embodiment, in the case where the charging circuit is switched from the first charging state to the second charging state, after the first unidirectional switch is switched from unidirectional conduction to reverse disconnection, the first end of the first switching unit and the third end of the first switching unit are connected, then the switching switch is disconnected, and the connection between the first end of the first switching unit and the second end of the first switching unit is disconnected.

[0113] The embodiment of the application can first connect the loop in the second charging state and then disconnect the loop in the first charging state in the case where the charging circuit is switched from the first charging state to the second charging state due to the setting of the first unidirectional switch, thereby realizing the function of not needing to disconnect the connection between the charging circuit and the power supply during charging mode switching.

[0114] In some embodiments, the first switching unit 140 can include a first switch assembly, a second switch assembly, and a pre-charge resistor. The first end of the pre-charge resistor is connected to the charging port 130, and the second end of the pre-charge resistor is connected to the first switch assembly and the second switch assembly, respectively.

[0115] That is, the first switch assembly and the second switch assembly in the first switching unit 140 share the same pre-charge resistor.

[0116] In one example, the first end of the first switch assembly is connected to the charging port 130, the second end of the first switch assembly is connected to the first discharging port 100, and the third end of the first switch assembly is connected to the second end of the pre-charge resistor. In this example, as shown in FIG. 3, the first switch assembly can include a first switch K1 and a second switch K2. The first switch K1 is connected between the first end of the charging port 130 and the first discharging port 100, and the second switch K2 is connected between the second end of the pre-charge resistor and the first discharging port 100. The first end of the first switching unit 140 and the second end of the first switching unit 140 can be connected by controlling the first switch or the second switch to be conductive. When the second switch is conductive and the first switch is non-conductive, the first switching unit can be used to pre-charge the first battery pack, i.e., pre-discharge the first discharging port of the charging circuit. When the first switch is conductive and the second switch is non-conductive, the first switching unit can be used to formally charge the first battery pack, i.e., formally discharge the first discharging port of the charging circuit.

[0117] In one example, the first end of the first switch assembly is connected to the charging port 130, the second end of the first switch assembly is connected to the first discharging port 100, and the third end of the first switch assembly is connected to the second end of the pre-charge resistor. In this example, as shown in FIG. 3, the first switch assembly can include a first switch K1 and a second switch K2. The first switch K1 is connected between the first end of the charging port 130 and the first discharging port 100, and the second switch K2 is connected between the second end of the pre-charge resistor and the first discharging port 100. The first end of the first switching unit 140 and the second end of the first switching unit 140 can be connected by controlling the first switch or the second switch to be conductive. When the second switch is conductive and the first switch is non-conductive, the first switching unit can be used to pre-charge the first battery pack, i.e., pre-discharge the first discharging port of the charging circuit. When the first switch is conductive and the second switch is non-conductive, the first switching unit can be used to formally charge the first battery pack, i.e., formally discharge the first discharging port of the charging circuit.

[0118] In this example, as shown in FIG. 3, the second switch assembly can include a third switch K3 and a fourth switch K4. The first end of the third switch K3 is connected to the first end of the charging port, the second end of the third switch K3 is connected between the first one-way switch 120 and the second discharging port 110, the first end of the fourth switch K4 is connected to the second end of the pre-charge resistor, and the second end of the fourth switch K4 is connected between the first one-way switch 120 and the second discharging port 110. The first end of the first switching unit 140 and the third end of the first switching unit 140 can be connected by controlling the third switch K3 or the fourth switch K4 to be conductive. When the fourth switch K4 is conductive and the third switch K3 is non-conductive, the first switching unit 140 can be used to pre-charge the second battery pack, i.e., pre-discharge the first discharging port of the charging circuit. When the third switch K3 is conductive and the fourth switch K4 is non-conductive, the first switching unit 140 can be used to formally charge the second battery pack, i.e., formally discharge the second discharging port of the charging circuit. The first one-way switch 120 is, for example, a diode D1.

[0119] In different charging modes, the first switching unit can realize both series pre-charging and parallel pre-charging of the battery pack by multiplexing the same pre-charge resistor, which reduces the size and cost of the battery system.

[0120] In some embodiments, as shown in FIG3 , the second switching unit 150 may include a fifth switch K5 and a sixth switch K6. A first end of the fifth switch K5 is connected to the second end of the charging port 130, and a second end of the fifth switch K5 is connected between the first unidirectional switch 120 and the first discharging port. A first end of the sixth switch K6 is connected to the second end of the charging port 130, and a second end of the sixth switch K6 is connected to the second discharging port 110.

[0121] In this embodiment, the first end of the second switching unit 150 and the second end of the second switching unit 150 can be connected by controlling the fifth switch K5 to be turned on and the sixth switch K6 to be turned off, and the first end of the second switching unit 150 and the third end of the second switching unit 150 can be connected.

[0122] In some embodiments, as shown in FIG3 , the charging circuit of the present application may further include a second unidirectional switch D2 connected between the second end of the first switching unit 140 and the first discharge port.

[0123] Alternatively, the charging circuit of the present application may further include a third unidirectional switch D3, a first end of the third unidirectional switch D3 being connected to the third end of the first switching unit 140, and a second end of the third unidirectional switch D3 being connected between the second discharge port and the first unidirectional switch.

[0124] Alternatively, the charging circuit of the present application may further include a fourth unidirectional switch D4 , which is connected between the third end of the second switching unit 150 and the second discharge port.

[0125] Alternatively, the charging circuit of the present application may further include a fifth unidirectional switch D5, a first end of the fifth unidirectional switch D5 being connected to the second end of the first switching unit 140, and a second end of the fifth unidirectional switch D5 being connected between the first discharge port and the first unidirectional switch.

[0126] In this embodiment, when the second charging state is the first discharge port discharging alone, when the charging circuit of the present application switches from the first charging state to the second charging state, since the fourth unidirectional switch D4 and the first unidirectional switch D1 are provided in the charging circuit, even if the fifth switch K5 is closed before the switching switch K7 and the sixth switch K6 are opened, no short circuit will be caused.

[0127] In this embodiment, the second and fifth switches K2 and K5 are closed first, followed by the first, second, and third switches K1, K7, and K6. After precharging the first battery pack BT1, the first switch K1 is closed. This eliminates the need to disconnect the charging circuit from the power source and then reconnect them, enabling seamless switching between charging modes.

[0128] When the second charging state is the second discharge port alone discharging, the charging circuit of the application switches from the first charging state to the second charging state, and because the third unidirectional switch D3 and the first unidirectional switch D1 are arranged in the charging circuit, even if the third switch K3 or the fourth switch K4 is closed first before the first switch K1, the switching switch K7 and the sixth switch K6 are disconnected, no short circuit will occur.

[0129] In the embodiment, the fourth switch K4 can be controlled to be closed first, and after the pre-charging of the second battery pack BT2 is completed, the third switch K3 is closed, and then the first switch K1, the switching switch K7 and the sixth switch K6 are disconnected. In this way, without disconnecting the charging circuit from the power supply first and then reconnecting the charging circuit and the power supply, seamless switching of the charging mode can be realized.

[0130] In addition, the first unidirectional switch D1, the second unidirectional switch D2, the third unidirectional switch D3, the fourth unidirectional switch D4 and the fifth unidirectional switch D5 are arranged in the charging circuit, so that even if the switching devices in the charging circuit are sintered, there is no risk of short circuit in the circuit.

[0131] The embodiment adds unidirectional switches to realize seamless switching of the charging mode, and even if the switching devices are sintered, there is no risk of short circuit in the circuit.

[0132] In some embodiments, as shown in FIG. 3, the charging circuit of the application can further include a switching switch K7. The switching switch K7 is connected between the first discharge port and the second discharge port. By controlling the conduction and cutoff of the switching switch K7, the charging circuit can be switched between the first charging state and the second charging state.

[0133] The embodiment of the application also provides a charging circuit control method applied to the charging circuit described in any one of the above embodiments. As shown in FIG. 4, the method can include the following step S100: in the case where the charging circuit is switched from the first charging state to the second charging state, the first unidirectional switch is switched from unidirectional conduction to reverse disconnection.

[0134] In the embodiment, the first charging state is that the first discharge port and the second discharge port are in series discharging. The second charging state is that the first discharge port and the second discharge port are in parallel discharging. Alternatively, the second charging state is that the first discharge port alone discharges or the second discharge port alone discharges.

[0135] In some embodiments, the charging circuit control method of the application can further include the following step S101: in the case where the charging circuit is in the first charging state, the first end of the first switching unit and the second end of the first switching unit are connected, and the first end of the second switching unit and the third end of the second switching unit are connected.

[0136] In some embodiments, when the charging circuit is in the second charging state, the charging circuit control method of the present application can further comprise step S102 and / or step S103.

[0137] In step S102, the first end of the first switching unit and the second end of the first switching unit are connected, and the first end of the second switching unit and the second end of the second switching unit are connected.

[0138] In step S103, the first end of the first switching unit and the third end of the first switching unit are connected, and the first end of the second switching unit and the third end of the second switching unit are connected.

[0139] In some embodiments, after step S100, the charging circuit control method of the present application can further comprise step S110, step S120 or step S130.

[0140] In step S110, after the first end of the first switching unit and the second end of the first switching unit are connected, and the first end of the second switching unit and the second end of the second switching unit are connected, the switching switch is turned off, and the first end of the second switching unit and the third end of the second switching unit are connected. That is, after step S100, the charging circuit control method of the present application can further comprise controlling the first discharge port to pre-discharge.

[0141] In step S120, after the first end of the first switching unit and the third end of the first switching unit are connected, the switching switch is turned off, and the first end of the first switching unit and the second end of the first switching unit are connected. That is, after step S100, the charging circuit control method of the present application can further comprise controlling the second discharge port to pre-discharge.

[0142] In step S130, after the first end of the first switching unit and the third end of the first switching unit are connected, and the first end of the second switching unit and the second end of the second switching unit are connected, the switching switch is turned off. That is, after step S100, the charging circuit control method of the present application can further comprise controlling the first discharge port and the second discharge port to parallel pre-discharge.

[0143] In the second charging state, when the first discharge port and / or the second discharge port are pre-discharged, the connection between the first end of the first switching unit and the second end of the first switching unit in step S110 can comprise: the second switch is turned on, and the first switch is turned off.

[0144] In step S120, the connection between the first end of the first switching unit and the third end of the first switching unit can comprise: the fourth switch is turned on, and the third switch is turned off.

[0145] In the second charging state, the first discharge port and / or the second discharge port is formally discharged, the communication between the first end of the first switching unit and the second end of the first switching unit in step S110 can include: the first switch is turned on, and the second switch is turned off.

[0146] The communication between the first end of the first switching unit and the third end of the first switching unit in step S120 can include: the third switch is turned on, and the fourth switch is turned off.

[0147] In some embodiments, the charging circuit control method of the application can further include steps S140 to S150.

[0148] In step S140, when the first voltage is greater than the second vehicle voltage, the charging circuit is in the first charging state.

[0149] In step S150, when the first voltage is greater than the first vehicle voltage and the first voltage is less than the second vehicle voltage, the charging circuit is in the second charging state.

[0150] Wherein, the first voltage is the voltage output by the power supply, the first vehicle voltage is the voltage of the vehicle when the battery pack is in parallel, and the second vehicle voltage is the voltage of the vehicle when the battery pack is in series.

[0151] In the case that the first voltage is less than the first vehicle voltage, the charging circuit is disconnected from the power supply.

[0152] In the embodiment, when the first voltage output by the power supply is greater than the vehicle voltage when the battery pack is in parallel or in series, the charging circuit is controlled to charge the battery pack in the corresponding charging state. When the first voltage output by the power supply is less than the vehicle voltage when the battery pack is in parallel and in series, the charging circuit is controlled not to charge the battery pack.

[0153] The embodiment can realize the adaptation between the power supply output voltage and the vehicle voltage by switching the battery pack in series and in parallel, and complete the normal charging of the vehicle power battery pack.

[0154] The specific implementation of the charging circuit control method embodiment of the application can refer to the control method described in the charging circuit embodiment, which will not be described in detail here.

[0155] The embodiment of the application also provides an equalization circuit. As shown in FIGS. 5 to 6, the equalization circuit can include a switching unit 200. The switching unit 200 is connected to a first battery pack BT1 and a second battery pack BT2 at both ends. The switching unit 200 is used for voltage equalization of the first battery pack and the second battery pack. The switching unit 200 is also used for discharging the first battery pack and / or the second battery pack.

[0156] In one example, the first end of the switching unit 200 is connected to the first end of the first battery pack, the second end of the switching unit 200 is connected to the first end of the second battery pack, and the second end of the first battery pack is connected to the second end of the second battery pack. The first end and the second end of the first battery pack can be the positive and negative electrodes of the first battery pack, respectively. The first end and the second end of the second battery pack can be the positive and negative electrodes of the second battery pack, respectively.

[0157] In some embodiments, as shown in FIG. 7, the equalization circuit further includes a switching switch 160 connected between the first battery pack BT1 and the second battery pack BT2.

[0158] In this embodiment, by controlling the conduction and cutoff of the switching switch 160, the discharge mode of the battery pack can be switched. The discharge mode of the battery pack can include series discharge of the first battery pack and the second battery pack, parallel discharge of the first battery pack and the second battery pack, or single discharge of the first battery pack or the second battery pack. When the supply voltage of a single first battery pack or second battery pack cannot meet the load voltage requirement, the first battery pack BT1 and the second battery pack BT2 can be connected in series to discharge the load. When the supply voltage of a single first battery pack or second battery pack meets the load voltage requirement, only one battery pack can be used to discharge the load.

[0159] In one example, as shown in FIG. 6, the switching switch 160 can be a switch K7. By controlling the conduction and cutoff of the switching switch K7, the discharge mode of the battery pack can be switched.

[0160] In one example, the SOH (State of Health) of the battery pack can be obtained by a detection device CT shown in FIG. 9 connected to the first battery pack BT1 and the second battery pack BT2. According to the SOH of the battery pack, a specific battery pack is determined to discharge the load. In this example, the SOH value of the battery pack can be detected at regular intervals, and the battery pack can be selected flexibly. In this way, the voltage difference between the multiple battery packs can be controlled within a certain range.

[0161] After a long period of use, the multiple battery packs will have a voltage difference after charging. At this time, voltage equalization needs to be performed between the multiple battery packs to reduce the voltage difference between the multiple battery packs. After charging is completed, the battery system of the present embodiment first disconnects the connection with the wired charging pile or the wireless charging transmission circuit, then performs voltage equalization between the multiple battery packs through the connected switching unit, and after the voltage equalization is completed, the first battery pack and / or the second battery pack are connected to the output end through the switching unit to discharge the load by the first battery pack and / or the second battery pack.

[0162] In the embodiment, the voltage equalization and discharging of the plurality of battery packs can be realized by controlling the switching unit, which greatly reduces the volume of the battery system and reduces the cost.

[0163] When the equalization circuit equalizes the voltage difference between the plurality of battery packs, the voltage difference between the plurality of battery packs will decrease with the increase of the equalization duration. In the prior art, the voltage equalization under large voltage difference and the voltage equalization under small voltage difference are realized by the same scheme, which is not conducive to improving the equalization efficiency.

[0164] Therefore, in some embodiments, as shown in FIG. 6, the switching unit 200 can include an eighth switch K8, a ninth switch K9 and a first resistor R2. The eighth switch K8 is connected between the first end of the first battery pack BT1 and the first end of the second battery pack BT2, and the ninth switch K9 and the first resistor R2 are connected in series between the first end of the first battery pack BT1 and the first end of the second battery pack BT2. That is, the circuit connected by the eighth switch K8 is connected in parallel with the circuit connected by the ninth switch K9 and the first resistor R2 between the first end of the first battery pack BT1 and the first end of the second battery pack BT2.

[0165] In the embodiment, the voltage difference between the first battery pack and the second battery pack can be determined first. When the voltage difference is greater than the first pressure difference threshold, the eighth switch K8 is controlled to be turned on and the ninth switch K9 is controlled to be turned off, so as to realize the voltage equalization at the first set speed by connecting the circuit connected by the eighth switch K8. When the voltage difference is less than or equal to the first pressure difference threshold, the eighth switch K8 is controlled to be turned off and the ninth switch K9 is controlled to be turned on, so as to realize the voltage equalization at the second set speed by connecting the circuit connected by the ninth switch K9. It can be understood that the first set speed is greater than the second set speed.

[0166] In the embodiment, after one of the first battery pack and the second battery pack is fully charged, the other of the first battery pack and the second battery pack is charged, and after the other is fully charged, the battery system is considered to be fully charged. When the battery system is fully charged, the voltage difference between the first battery pack and the second battery pack is determined. The discharging circuit is controlled to perform voltage equalization between the first battery pack and the second battery pack at a speed matched with the voltage difference.

[0167] In the embodiment, the switching unit can also be controlled to connect the circuit connected by the ninth switch K9 and the first resistor R2 in series, so that the battery pack is pre-discharged, that is, the battery pack pre-discharges the load. The switching unit can also be controlled to connect the circuit connected by the eighth switch K8, so that the battery pack formally discharges the load.

[0168] In the process of discharging the battery pack for the load, the embodiment first controls the switching unit to be connected to the line in which the pre-discharge resistor is located, to perform pre-discharge. After the pre-discharge is completed, the switching unit is controlled to be connected to the formal discharge line.

[0169] In the embodiment, the voltage equalization at different speeds can be realized by controlling the switching unit to switch in different lines, so as to balance the equalization efficiency and equalization accuracy. At the same time, the processes of voltage equalization, pre-discharge and formal discharge of multiple battery packs can be realized by controlling the switching unit, which greatly reduces the size of the battery system and reduces the cost.

[0170] In some embodiments, as shown in FIG. 6, the eighth switch K8, the ninth switch K9 and the first resistor R2 can constitute a first switching unit. The switching unit can also include a tenth switch K10, an eleventh switch K11 and a second resistor R3. The tenth switch K10, the eleventh switch K11 and the second resistor R3 constitute a second switching unit. The first switching unit and the second switching unit are connected in series to constitute the switching unit 200. The eleventh switch K11 and the second resistor R3 are connected in series and are connected in parallel with the tenth switch K10.

[0171] In the embodiment, the resistance value of the first resistor can be the same as or different from the resistance value of the second resistor.

[0172] In the case where the resistance value of the first resistor is greater than the resistance value of the second resistor, the voltage difference between the first battery pack and the second battery pack can be determined first in the embodiment.

[0173] In the case where the voltage difference is greater than the first voltage difference threshold, the eighth switch K8 is controlled to be turned on, the ninth switch K9 is controlled to be turned off, the tenth switch K10 is controlled to be turned on, and the eleventh switch K11 is controlled to be turned off, so as to realize voltage equalization at the first set speed by connecting the lines in which the eighth switch K8 and the tenth switch K10 are located.

[0174] In the case where the voltage difference is less than or equal to the first voltage difference threshold and the voltage difference is greater than the second voltage difference threshold, the eighth switch is controlled to be turned on, the ninth switch is controlled to be turned off, the tenth switch is controlled to be turned off, and the eleventh switch is controlled to be turned on, so as to realize voltage equalization at the second set speed by connecting the lines in which the eighth switch K8 and the eleventh switch K11 are located.

[0175] In the case where the voltage difference is less than or equal to the second voltage difference threshold and the voltage difference is greater than the third voltage difference threshold, the eighth switch is controlled to be turned off, the ninth switch is controlled to be turned on, the tenth switch is controlled to be turned on, and the eleventh switch is controlled to be turned off, so as to realize voltage equalization at the third set speed by connecting the lines in which the ninth switch K9 and the tenth switch K10 are located. The first voltage difference threshold is greater than the second voltage difference threshold, and the second voltage difference threshold is greater than the third voltage difference threshold.

[0176] When the voltage difference is less than or equal to the third voltage difference threshold, the eighth switch is controlled to be turned off, the ninth switch is turned on, the tenth switch is turned off, and the eleventh switch is turned on, so as to achieve voltage balancing at a fourth set speed by connecting the circuit where the ninth switch K9 and the eleventh switch K11 are located.

[0177] When the resistance of the first resistor is equal to the resistance of the second resistor, in this embodiment, the balancing circuit control method when the voltage difference is greater than the first voltage difference threshold and when the voltage difference is less than or equal to the third voltage difference threshold are the same and are not described in detail here.

[0178] When the voltage difference is less than or equal to a first voltage difference threshold and greater than a third voltage difference threshold, the eighth and eleventh switches are controlled to be turned on and the ninth and tenth switches are turned off, or the eighth and eleventh switches are controlled to be turned off and the ninth and tenth switches are controlled to be turned on, so as to connect the line where the ninth switch K9 and the tenth switch K10 are connected or connect the line where the eighth switch K8 and the eleventh switch K11 are connected, thereby achieving voltage balancing at a second set speed. The first voltage difference threshold is greater than the third voltage difference threshold.

[0179] It can be understood that the first set speed, the second set speed, the third set speed, and the fourth set speed gradually decrease.

[0180] As an example, this embodiment can detect the voltage difference between multiple battery packs in real time or on a scheduled basis. When the voltage difference is detected to be greater than a first voltage difference threshold, the eighth switch is first turned on, the ninth switch is turned off, the tenth switch is turned on, and the eleventh switch is turned off for fast balancing. After a period of fast balancing, the voltage difference decreases. When the voltage difference is detected to be less than or equal to the first voltage difference threshold and greater than a second voltage difference threshold, the eighth switch is turned on, the ninth switch is turned off, the tenth switch is turned off, and the eleventh switch is turned on for medium-speed balancing. When the voltage difference is detected to be less than or equal to the second voltage difference threshold and greater than a third voltage difference threshold, the eighth switch is turned off, the ninth switch is turned on, and the tenth switch is turned on, further reducing the balancing speed. Finally, when the voltage difference is less than or equal to the third voltage difference threshold, the eighth switch is turned off, the ninth switch is turned on, the tenth switch is turned off, and the eleventh switch is turned on for slow balancing. In this way, the efficiency of voltage balancing can be improved by flexibly adjusting the lines selected by the switching units. Furthermore, when the voltage difference is less than or equal to the third voltage difference threshold, slow balancing is adopted to improve the accuracy of balancing.

[0181] This embodiment uses two switching units to flexibly change the effective circuit of the switching unit to accommodate different voltage differentials in the battery pack. Furthermore, voltage balancing of the battery pack can be performed at different speeds for different battery pack voltage differentials, thereby achieving a better balance between balancing speed and accuracy.

[0182] More switching units can be set according to actual needs in the embodiment. The resistances in different switching units can be different, so as to realize more refined pressure difference levels.

[0183] In some embodiments, the equalization circuit can further include an output end. The third end of the switching unit is further used to connect the output end, which is used to discharge the load.

[0184] As an example, as shown in FIG. 6, the output end can include a first discharge port A and a second discharge port B. The first discharge port A and the second discharge port B are both connected with the load.

[0185] In some embodiments, the equalization circuit can further include a switching switch K7 connected between the first battery pack and the second battery pack. In the embodiment, by turning on and turning off the switching switch K7, the discharge mode of the battery pack can be switched.

[0186] In the embodiment, the switching devices in the battery system can all be contactors.

[0187] In the battery system of the embodiment, the number of battery packs can be greater than two.

[0188] In the embodiment, the unidirectional switch can be replaced by any circuit, device and apparatus for realizing unidirectional conduction of current. The unidirectional switch can be, for example, a diode.

[0189] In the embodiment, the pre-charge resistor of the charging circuit and the resistor in the switching unit of the equalization circuit function to reduce the current across the contactor before the contactor is closed, so as to avoid that the contactor is sintered due to too large current when the contactor is closed. This can be extended to any circuit, component, apparatus, device, etc. that can reduce the current across the contactor and prevent the contactor from being sintered when it is closed.

[0190] The embodiment of the application further provides an equalization circuit control method applied to the equalization circuit as described in any of the above embodiments. As shown in FIG. 8, the method can include steps S200 to S210.

[0191] In step S200, in the voltage equalization mode, the switching unit 200 is connected between the first battery pack and the second battery pack, and the first battery pack and the second battery pack are voltage equalized.

[0192] In step S210, in the battery discharge mode, the switching unit 200 is used to connect the first battery pack and / or the second battery pack with the output end, so that the first battery pack and / or the second battery pack are discharged.

[0193] In some embodiments, the equalization circuit control method of the application can further include steps S220 to S240.

[0194] Step S220, determine the voltage difference between the first battery pack and the second battery pack.

[0195] Step S230, in the case that the voltage difference is greater than the first voltage difference threshold, the eighth switch is turned on and the ninth switch is turned off, or the tenth switch is turned on and the eleventh switch is turned off.

[0196] Step S240, in the case that the voltage difference is less than or equal to the first voltage difference threshold, the eighth switch is turned off and the ninth switch is turned on, or the tenth switch is turned off and the eleventh switch is turned on.

[0197] In some embodiments, the equalization circuit control method of the present application can further include step S250, in the case that the voltage difference is greater than the first voltage difference threshold, the eighth switch is turned on, the ninth switch is turned off, the tenth switch is turned on, and the eleventh switch is turned off.

[0198] In the case that the resistance value of the first resistor is greater than the resistance value of the second resistor, the equalization circuit control method of the present application can further include steps S260 to S270.

[0199] Step S260, in the case that the voltage difference is less than or equal to the first voltage difference threshold and greater than the second voltage difference threshold, the eighth switch is turned on, the ninth switch is turned off, the tenth switch is turned off, and the eleventh switch is turned on.

[0200] Step S270, in the case that the voltage difference is less than or equal to the second voltage difference threshold and greater than the third voltage difference threshold, the eighth switch is turned off, the ninth switch is turned on, the tenth switch is turned on, and the eleventh switch is turned off.

[0201] Wherein, the first voltage difference threshold is greater than the second voltage difference threshold, and the second voltage difference threshold is greater than the third voltage difference threshold.

[0202] In the case that the resistance value of the first resistor is equal to the resistance value of the second resistor, the equalization circuit control method of the present application can further include step S280, in the case that the voltage difference is less than or equal to the first voltage difference threshold and greater than the third voltage difference threshold, the eighth switch and the eleventh switch are turned on and the ninth switch and the tenth switch are turned off, or the eighth switch and the eleventh switch are turned off and the ninth switch and the tenth switch are turned on. Wherein, the first voltage difference threshold is greater than the third voltage difference threshold.

[0203] The equalization circuit control method can further include step S290, in the case that the voltage difference is less than or equal to the third voltage difference threshold, the eighth switch is turned off, the ninth switch is turned on, the tenth switch is turned off, and the eleventh switch is turned on.

[0204] The specific implementation of the method embodiment of the present application can refer to the control method in the battery system embodiment, which will not be described in detail here.

[0205] The embodiment of the present application can integrate the charging circuit and the balancing circuit together. As an example, as shown in FIG. 9. The specific circuit structure can refer to the specific embodiments of the charging circuit and the balancing circuit described above, which will not be repeated here.

[0206] The embodiment of the present application also provides a charging system, including the charging circuit according to any one of the above embodiments.

[0207] The embodiment of the present application also provides a battery system 1000, including the balancing circuit according to any one of the above embodiments, the first battery pack and the second battery pack.

[0208] The embodiment of the present application also provides a power consumption system, as shown in FIG. 10, the power consumption system 2000 includes the battery system 1000 and the load 1100 according to the above embodiments.

[0209] The embodiment of the present application also provides a controller, as shown in FIG. 11, the controller 3000 includes a memory 3100 and a processor 3200, the memory 3100 is used to store computer instructions, and the processor 3200 is used to call the computer instructions from the memory 3100 to execute the method according to any one of the above embodiments.

[0210] The embodiment of the present application also provides a vehicle, including the controller 3000 according to the above embodiments.

[0211] The embodiment of the present application also provides a storage medium, which stores a computer program, and the computer program is executed by a processor to implement the method according to any one of the above embodiments.

[0212] The present application can be a system, a method, and / or a computer program product. The computer program product can include a computer readable storage medium having computer readable program instructions stored therein, which are used to cause a processor to implement various aspects of the present application.

[0213] Computer-readable storage media can be a tangible device that can hold and store the instructions used by the instruction execution device. Computer-readable storage media can be, for example, (but not limited to) an electrical storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination thereof. More specific examples (non-exhaustive list) of computer-readable storage media include: a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a static random access memory (SRAM), a portable compact disc read-only memory (CD-ROM), a digital versatile disk (DVD), a memory stick, a floppy disk, a mechanical encoding device, for example, a punch card or a convex structure in a groove on which instructions are stored, and any suitable combination thereof. Computer-readable storage media used herein is not interpreted as a transient signal itself, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagated by waveguides or other transmission media (for example, light pulses by fiber optic cables), or electrical signals transmitted by wires.

[0214] The computer-readable program instructions described herein can be downloaded from a computer-readable storage medium to each computing / processing device, or downloaded to an external computer or external storage device via a network, such as the Internet, a local area network, a wide area network, and / or a wireless network. The network can include copper transmission cables, fiber optic transmission, wireless transmission, routers, firewalls, switches, gateway computers, and / or edge servers. The network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards the computer-readable program instructions to be stored in the computer-readable storage medium in each computing / processing device.

[0215] Computer readable program instructions for carrying out operations of the present application can be assembler instructions, instruction-set-architecture (ISA) instructions, machine instructions, machine dependent instructions, microcode, firmware instructions, state-setting data, or either source code or object code written in any combination of one or more programming languages, including an object oriented programming language such as Smalltalk, C++ or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The computer readable program instructions can execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the latter scenario, the remote computer can 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 the connection can be made to an external computer (for example, through the Internet using an Internet Service Provider). In some embodiments, electronic circuitry including, for example, programmable logic circuitry, field-programmable gate array (FPGA), or programmable logic array (PLA) can execute the computer readable program instructions by utilizing state information of the computer readable program instructions to personalize the electronic circuitry, in order to perform aspects of the present application.

[0216] The computer readable program instructions can 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 apparatus or other device to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide processes for implementing the functions / acts specified in the flowchart and / or block diagram block or blocks.

[0217] 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, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions / acts specified in the flowchart and / or block diagram block or blocks. These computer readable program instructions can also be stored in a computer readable storage medium that can include random access memory (RAM), read only memory (ROM), electrically erasable programmable read only memory (EEPROM), flash memory or other data storage device. When the computer readable program instructions are loaded into the computer and other programmable data processing apparatus, a series of operational steps are implemented that provide processes such that the computer or other programmable apparatus provide processes for implementing the functions / acts specified in the flowchart and / or block diagram block or blocks.

[0218] The computer readable program instructions can 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 which execute on the computer, other programmable data processing apparatus, or other device implement the functions / acts specified in the flowchart and / or block diagram block or blocks.

[0219] The computer readable program instructions can 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 which execute on the computer, other programmable data processing apparatus, or other device implement the functions / acts specified in the flowchart and / or block diagram block or blocks.

[0220] Embodiments of the present application have been described above, and the description is intended to be illustrative, and not restrictive, of the various embodiments of the present application. Many modifications and variations of the described embodiments of the present application are possible, given the benefit of the present disclosure, without departing from the scope and spirit of the described embodiments of the present application. The scope of the present application is defined by the appended claims.

Claims

1. A charging circuit, wherein: include: A first discharge port, a second discharge port and a first unidirectional switch, wherein the first unidirectional switch is connected between the first discharge port and the second discharge port, and the first unidirectional switch is used for unidirectional conduction between the first discharge port and the second discharge port, the first discharge port is used to be connected to a first battery pack, and the second discharge port is used to be connected to a second battery pack.

2. The charging circuit according to claim 1, wherein: Also includes a charging port, a first switching unit and a second switching unit, The first end of the first switching unit is connected to the first end of the charging port, the second end of the first switching unit is connected to the first discharging port, and the third end of the first switching unit is connected between the first unidirectional switch and the second discharging port; A first end of the second switching unit is connected to the second end of the charging port, a second end of the second switching unit is connected between the first unidirectional switch and the first discharging port, and a third end of the second switching unit is connected to the second discharging port.

3. The charging circuit according to claim 2, wherein: The first switching unit includes a first switch component, a second switch component and a pre-charging resistor. A first end of the pre-charging resistor is connected to the charging port, and a second end of the pre-charging resistor is connected to the first switch component and the second switch component respectively; The first end of the first switch component is connected to the charging port, the second end of the first switch component is connected to the first discharging port, and the third end of the first switch component is connected to the second end of the pre-charging resistor; The first end of the second switch component is connected to the charging port, the second end of the second switch component is connected between the second discharging port and the first unidirectional switch, and the third end of the second switch component is connected to the second end of the pre-charging resistor.

4. The charging circuit according to claim 3, wherein: The first switch assembly includes a first switch and a second switch, the first switch is connected between the first end of the charging port and the first discharging port, and the second switch is connected between the second end of the pre-charging resistor and the first discharging port.

5. The charging circuit according to claim 3, wherein: The second switch component includes a third switch and a fourth switch, wherein the first end of the third switch is connected to the first end of the charging port, the second end of the third switch is connected between the first unidirectional switch and the second discharge port, the first end of the fourth switch is connected to the second end of the pre-charging resistor, and the second end of the fourth switch is connected between the first unidirectional switch and the second discharge port.

6. The charging circuit according to claim 2, wherein: The second switching unit includes a fifth switch and a sixth switch; A first end of the fifth switch is connected to the second end of the charging port, and a second end of the fifth switch is connected between the first unidirectional switch and the first discharging port; A first end of the sixth switch is connected to the second end of the charging port, and a second end of the sixth switch is connected to the second discharging port.

7. The charging circuit according to any one of claims 1 to 6, wherein: The charging circuit further includes a switch connected between the first discharge port and the second discharge port.

8. The charging circuit according to any one of claims 1 to 6, wherein: The charging circuit further includes a second unidirectional switch connected between the second end of the first switching unit and the first discharge port; or The charging circuit further includes a third unidirectional switch, wherein a first end of the third unidirectional switch is connected to the third end of the first switching unit, and a second end of the third unidirectional switch is connected between the second discharge port and the first unidirectional switch; or, The charging circuit further includes a fourth unidirectional switch connected between the third terminal of the second switching unit and the second discharge port; or, The charging circuit further includes a fifth unidirectional switch, a first end of the fifth unidirectional switch being connected to the second end of the first switching unit, and a second end of the fifth unidirectional switch being connected between the first discharging port and the first unidirectional switch.

9. A charging circuit control method, applied to the charging circuit according to any one of claims 1 to 8, wherein: The method comprises: When the charging circuit switches from the first charging state to the second charging state, the first unidirectional switch switches from unidirectional conduction to reverse conduction; The first charging state is that the first discharge port and the second discharge port are discharged in series; the second charging state is that the first discharge port and the second discharge port are discharged in parallel, or the second charging state is that the first discharge port is discharged alone or the second discharge port is discharged alone.

10. The method according to claim 9, wherein: The method further comprises: When the charging circuit is in the first charging state, the first end of the first switching unit is connected to the second end of the first switching unit, and the first end of the second switching unit is connected to the third end of the second switching unit.

11. The method according to claim 9, wherein The method further comprises: When the charging circuit is in the second charging state, the first end of the first switching unit is connected to the second end of the first switching unit, and the first end of the second switching unit is connected to the second end of the second switching unit; and / or, The first end of the first switching unit is communicated with the third end of the first switching unit, and the first end of the second switching unit is communicated with the third end of the second switching unit.

12. The method according to claim 11, wherein The second charging state is pre-discharging of the first discharge port and / or the second discharge port, The first end of the first switching unit and the second end of the first switching unit are connected, including: The second switch is turned on and the first switch is turned off; The first end of the first switching unit and the third end of the first switching unit are connected, including: The fourth switch is turned on, and the third switch is turned off.

13. The method according to claim 9, wherein The method further comprises: When the first voltage is greater than the second vehicle voltage, the charging circuit is in the first charging state; or When the first voltage is greater than the first vehicle voltage and the first voltage is less than the second vehicle voltage, the charging circuit is in the second charging state; Among them, the first voltage is the voltage output by the power supply, the first whole vehicle voltage is the voltage of the whole vehicle when the battery packs are connected in parallel, and the second whole vehicle voltage is the voltage of the whole vehicle when the battery packs are connected in series.

14. An equalizing circuit, wherein: include: A switching unit, wherein both ends of the switching unit are connected to the first battery pack and the second battery pack respectively, and the switching unit is used to balance the voltages of the first battery pack and the second battery pack; the switching unit is also used to discharge the first battery pack and / or the second battery pack.

15. The equalizing circuit according to claim 14, wherein: The first end of the switching unit is connected to the first end of the first battery pack, the second end of the switching unit is connected to the first end of the second battery pack, and the second end of the first battery pack is connected to the second end of the second battery pack.

16. The equalizing circuit according to claim 15, wherein: The switching unit includes an eighth switch, a ninth switch, and a first resistor. The eighth switch is connected between the first end of the first battery pack and the first end of the second battery pack. The ninth switch and the first resistor are connected in series between the first end of the first battery pack and the first end of the second battery pack.

17. The equalizing circuit according to claim 16, wherein: The switching unit further includes a tenth switch, an eleventh switch, and a second resistor, wherein the eleventh switch and the second resistor are connected in series and then connected in parallel with the tenth switch; The eighth switch, the ninth switch and the first resistor constitute a first switching unit, the tenth switch, the eleventh switch and the second resistor constitute a second switching unit, and the first switching unit and the second switching unit are connected in series to constitute the switching unit.

18. The equalizing circuit according to claim 17, wherein: The first resistor is greater than the second resistor.

19. The equalizing circuit according to claim 14, wherein: It also includes an output end, and the third end of the switching unit is also used to connect to the output end, and the output end is used to discharge the load.

20. The equalizing circuit according to any one of claims 14 to 19, wherein: The balancing circuit further includes a switch connected between the first battery pack and the second battery pack.

21. A method for controlling an equalizing circuit, applied to the equalizing circuit according to any one of claims 14 to 20, wherein: The method comprises: In the voltage balancing mode, the switching unit connects the first battery pack and the second battery pack to perform voltage balancing on the first battery pack and the second battery pack; In the battery discharging mode, the switching unit is used to connect the first battery pack and / or the second battery pack to the output end, so that the first battery pack and / or the second battery pack are discharged.

22. The method according to claim 21, wherein The method further comprises: determining a voltage difference between the first battery pack and the second battery pack; When the voltage difference is greater than the first voltage difference threshold, the eighth switch is turned on and the ninth switch is turned off, or the tenth switch is turned on and the eleventh switch is turned off; When the voltage difference is less than or equal to the first voltage difference threshold, the eighth switch is turned off and the ninth switch is turned on, or the tenth switch is turned off and the eleventh switch is turned on.

23. The method according to claim 21, wherein The method further comprises: determining a voltage difference between the first battery pack and the second battery pack; When the voltage difference is greater than the first voltage difference threshold, the eighth switch is turned on, the ninth switch is turned off, the tenth switch is turned on, and the eleventh switch is turned off.

24. The method according to claim 23, wherein When the resistance of the first resistor is greater than the resistance of the second resistor, the method further includes: When the voltage difference is less than or equal to the first voltage difference threshold and the voltage difference is greater than the second voltage difference threshold, the eighth switch is turned on, the ninth switch is turned off, the tenth switch is turned off, and the eleventh switch is turned on; When the voltage difference is less than or equal to the second voltage difference threshold and the voltage difference is greater than the third voltage difference threshold, the eighth switch is turned off, the ninth switch is turned on, the tenth switch is turned on, and the eleventh switch is turned off; The first pressure difference threshold is greater than the second pressure difference threshold, and the second pressure difference threshold is greater than the third pressure difference threshold.

25. The method according to claim 23, wherein When the resistance value of the first resistor is equal to the resistance value of the second resistor, the method further includes: When the voltage difference is less than or equal to the first voltage difference threshold and the voltage difference is greater than the third voltage difference threshold, the eighth switch and the eleventh switch are turned on and the ninth switch and the tenth switch are turned off, or the eighth switch and the eleventh switch are turned off and the ninth switch and the tenth switch are turned on; The first pressure difference threshold is greater than the third pressure difference threshold.

26. The method according to any one of claims 24 to 25, wherein The method further comprises: When the voltage difference is less than or equal to the third voltage difference threshold, the eighth switch is turned off, the ninth switch is turned on, the tenth switch is turned off, and the eleventh switch is turned on.

27. A charging system, wherein: The charging circuit comprises the charging circuit according to any one of claims 1 to 8.

28. A battery system, wherein: The device comprises the balancing circuit according to any one of claims 14 to 20, a first battery pack and a second battery pack.

29. An electricity system, wherein: Comprising the battery system as claimed in claim 28 and a load.

30. A controller, wherein: 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 9 to 13, or the method according to any one of claims 21 to 26.

31. A vehicle, wherein Comprising a controller as claimed in claim 30.

32. A storage medium, wherein: A computer program is stored thereon, which implements the method according to any one of claims 9 to 13, or the method according to any one of claims 21 to 26 when executed by a processor.

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