Power supply system, battery pack and vehicle

Abstract

The utility model relates to a power supply system, a battery pack and a vehicle, the system comprises a first battery module, the first pole of the first battery module is connected with a first power supply end, and the second pole of the first battery module is connected with a second power supply end; a second pole of the second battery module is connected with a third power supply end; the first switch unit is configured to enable the first battery module and the second battery module to be connected in series and supply power through the first power supply end and the third power supply end; and the first battery module and the second battery module are connected in parallel and are supplied with power through the first power supply end and the second power supply end. According to the power supply system, the power supply voltage of the battery pack can be adjusted, the voltage requirements under different conditions are met, and use is more flexible and convenient.

Description

Technical Field

[0001] The present application relates to the technical field of battery equipment, and in particular to a power supply system, a battery pack and a vehicle. Background Art

[0002] At present, with the development of new energy vehicles, the battery pack voltage is gradually increasing in pursuit of greater charging power, higher driving power, and lighter vehicle weight. In related technologies, small-capacity, low-voltage cells are generally used in parallel to form large-capacity, low-voltage modules, and then the modules are connected in series to form large-capacity, high-voltage battery packs. This solution can only provide one voltage platform, and once a voltage is selected, it cannot be adjusted, and it is impossible to take into account the advantages of both high and low voltage platforms at the same time. Utility Model Content

[0003] The present application is proposed to solve the above-mentioned problems. According to one aspect of the present application, a power supply system is provided, wherein the system comprises: a first battery module, wherein a first pole of the first battery module is connected to a first power supply terminal, and a second pole of the first battery module is connected to a second power supply terminal; a second battery module, wherein a second pole of the second battery module is connected to a third power supply terminal; and a first switch unit, wherein the first switch unit is configured to: connect the first battery module and the second battery module in series and supply power through the first power supply terminal and the third power supply terminal, or connect the first battery module and the second battery module in parallel and supply power through the first power supply terminal and the second power supply terminal.

[0004] Exemplarily, the first switch unit includes: a first switch, through which the first pole of the second battery module can be switchably connected to the first power supply end or the second pole of the first battery module; and a second switch, through which the second pole of the second battery module can be switchedly connected to the second power supply end.

[0005] Exemplarily, the first switch is a single-pole double-throw switch, the common end of the first switch is connected to the first pole of the second battery module, the first switching end of the first switch is connected to the first power supply end, and the second switching end of the first switch is connected to the second pole of the first battery module.

[0006] Exemplarily, the second switch is a single-pole single-throw switch, a first end of the second switch is connected to the second power supply end, and a second end of the second switch is connected to the second pole of the second battery module.

[0007] Exemplarily, the second battery module includes: at least two battery cells; and a second switch unit, wherein the second switch unit is configured to: connect the at least two battery cells in series, or connect the at least two battery cells in parallel.

[0008] Exemplarily, the first switch unit is configured to: when the at least two battery cells are connected in series, connect the first battery module and the second battery module in parallel to supply power through the first power supply terminal and the second power supply terminal; or, when the at least two battery cells are connected in parallel, connect the first battery module and the second battery module in series to supply power through the first power supply terminal and the third power supply terminal.

[0009] Exemplarily, the second switch unit includes: a third switch, through which the first pole of at least one of the battery cells can be connected to the third power supply end in an on-off manner, and the second pole of at least one of the battery cells can be connected to the second pole of the second battery module in an on-off manner; a fourth switch, through which the second pole of at least one of the battery cells can be connected to the first pole of the adjacent battery cell in an on-off manner; the second switch unit is configured as: the third switch is closed and the fourth switch is opened, so that the at least two battery cells are connected in parallel; or, the third switch is opened and the fourth switch is closed, so that the at least two battery cells are connected in series.

[0010] Exemplarily, the second battery module includes a first battery cell, a second battery cell and a third battery cell, the first pole of the first battery cell is connected to a first bus terminal, and the first bus terminal is switchably connected to the second pole of the first battery module or the first power supply terminal through the first switch; the second pole of the third battery cell is connected to a second bus terminal, and the second bus terminal is connected to the third power supply terminal; the second bus terminal can also be connected to the second power supply terminal in a switchable manner through the second switch.

[0011] Exemplarily, the system further includes a controller, which is electrically connected to the first switch unit and the second switch unit to control the configuration state of the first switch unit and the second switch unit.

[0012] Exemplarily, the first battery module and the second battery module have the same number of battery cells.

[0013] Exemplarily, after the battery cells in the second battery module are connected in series, the voltage of the second battery module is the same as that of the first battery module.

[0014] According to another aspect of the present application, a battery pack is provided, wherein the battery pack includes the above-mentioned power supply system.

[0015] According to another aspect of the present application, a vehicle is provided, the vehicle comprising the above-mentioned battery pack, or comprising the above-mentioned power supply system.

[0016] The power supply system in the present application connects the first battery module and the second battery module together through the first switch unit. The connection mode between the first battery module and the second battery module can be changed by adjusting the switch. When the first battery module and the second battery module are connected in series, the total voltage is higher. When the first battery module and the second battery module are connected in parallel, the total voltage is lower. The power supply system in the present application can adjust the supply voltage of the battery pack by adjusting the first switch unit to meet the use requirements in different situations, and is more flexible and convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] By describing the embodiments of the present application in more detail in conjunction with the accompanying drawings, the above and other purposes, features and advantages of the present application will become more apparent. The accompanying drawings are used to provide a further understanding of the embodiments of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application and do not constitute a limitation of the present application. In the accompanying drawings, the same reference numerals generally represent the same components or steps.

[0018] Figure 1 The structure block diagram of the power supply system in the first embodiment is shown.

[0019] Figure 2 A circuit diagram of a power supply system in Embodiment 1 is shown.

[0020] FIG3( a ) shows an equivalent circuit diagram of a power supply system in high voltage mode in the first embodiment.

[0021] FIG3( b ) shows an equivalent circuit diagram of the power supply system in the low voltage mode in the first embodiment.

[0022] Figure 4 A schematic diagram of state switching of the second battery module in the first embodiment is shown.

[0023] Figure 5 A schematic diagram of the process of switching the power supply system state in the first embodiment is shown.

[0024] Figure 6 A circuit diagram of a power supply system in Embodiment 2 is shown. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the present application more obvious, the example embodiments according to the present application will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application, and it should be understood that the present application is not limited to the example embodiments described herein. Based on the embodiments of the present application described in the present application, all other embodiments obtained by those skilled in the art without creative work should fall within the scope of protection of the present application.

[0026] like Figure 1 As shown, a power supply system is applied to a battery pack, and the system includes: a first battery module, a second battery module and a first switch unit.

[0027] The first pole of the first battery module is connected to the first power supply terminal, and the second pole of the first battery module is connected to the second power supply terminal. The second pole of the second battery module is connected to the third power supply terminal. The first switch unit is configured to: connect the first battery module and the second battery module in series and supply power through the first power supply terminal and the third power supply terminal, or connect the first battery module and the second battery module in parallel and supply power through the first power supply terminal and the second power supply terminal.

[0028] The power supply system in the present application connects the first battery module and the second battery module together through the first switch unit. The connection mode between the first battery module and the second battery module can be changed by adjusting the switch. When the first battery module and the second battery module are connected in series, the total voltage is higher. When the first battery module and the second battery module are connected in parallel, the total voltage is lower. The power supply system in the present application can adjust the supply voltage of the battery pack by adjusting the first switch unit to meet the use requirements in different situations, and is more flexible and convenient to use.

[0029] Exemplarily, the above-mentioned first power supply terminal is the negative pole of the battery pack, and the second power supply terminal and the third power supply terminal are respectively the two positive poles of the battery pack. When the first switch unit connects the first battery module and the second battery module in series, the second power supply terminal is invalid and the third power supply terminal is valid. The battery pack discharges through the first power supply terminal and the third power supply terminal. When the first battery module and the second battery module are connected in parallel, the second power supply terminal is valid and the third power supply terminal is invalid, and the battery pack discharges through the first power supply terminal and the second power supply terminal. Exemplarily, although the second pole of the second battery module is always connected to the third power supply terminal, when the third power supply terminal is invalid, power will not be supplied through the third power supply terminal.

[0030] like Figure 2 As shown, it is a circuit diagram of the power supply system in an embodiment of the present application. Exemplarily, the first switch unit includes a first switch 4 (the switch Reg_S1 in the figure is the first switch 4) and a second switch 5 (Reg_S2 in the figure is the second switch 5), and the first pole of the second battery module 7 is switchably connected to the second pole or the first power supply end of the first battery module 1 through the first switch 4. The first switch 4 is a single-pole double-throw switch, the common end of the first switch 4 is connected to the first pole of the second battery module 7, the first switching end of the first switch 4 is connected to the first power supply end, and the second switching end of the first switch 4 is connected to the second pole of the first battery module 1. Switch1 and switch2 in the figure represent the first switching end and the second switching end of the first switch 4, respectively. The second pole of the second battery module can be connected to the second power supply end through the second switch 5.

[0031] Exemplarily, the second battery module 7 includes at least two battery cells and a second switch unit, and the at least two battery cells are connected to the second switch unit. The second switch unit is configured to connect the at least two battery cells in series or in parallel.

[0032] The above-mentioned first switch unit is configured as follows: when the second switch unit is connected in series with at least two battery cells, the first battery module 1 and the second battery module 7 are connected in parallel to supply power through the first power supply end and the second power supply end; or, when the second switch unit is connected in parallel with at least two battery cells, the first battery module 1 and the second battery module 7 are connected in series to supply power through the first power supply end and the third power supply end.

[0033] When the second battery module 7 and the first battery module 1 are connected in series to provide a high voltage, the cells inside the second battery module 7 are connected in parallel, and when the second battery module 7 and the first battery module 1 are connected in parallel, the cells inside the second battery module 7 are connected in series. Exemplarily, after the cells in the second battery module 7 are connected in series, the voltage of the second battery module 7 and the first battery module 1 are the same. In addition, the number of cells in the first battery module 1 and the second battery module 7 is the same. In the embodiment of the present application, the number of cells in the first battery module 1 and the second battery module 7 are both 3.

[0034] The second switch unit includes a third switch 3 and a fourth switch 6. The first pole of at least one battery cell in the second battery module 7 can be connected to the first pole of the second battery module 7 through the third switch 3, and the second pole of at least one battery cell can be connected to the second pole of the second battery module 7 through the third switch 3. The second pole of at least one battery cell can be connected to the first pole of the adjacent battery cell through the fourth switch 6. When the third switch 3 is turned on, the battery cells in the second battery module 7 can be connected in parallel, and when the fourth switch 6 is turned on, the battery cells in the second battery module 7 can be connected in series, wherein the third switch 3 and the fourth switch 6 cannot be turned on at the same time to avoid a short circuit.

[0035] The second switch unit is configured as follows: the third switch 3 is closed and the fourth switch 6 is opened to connect at least two battery cells in parallel; or the third switch 3 is opened and the fourth switch 6 is closed to connect at least two battery cells in series.

[0036] like Figure 2As shown, the first battery module 1 and the second battery module 7 each include three battery cells, and the second battery module 7 includes a first battery cell, a second battery cell and a third battery cell. ParaFour_S in the figure is the third switch 3. TandTwo_S in the figure represents the fourth switch 6. By adjusting the third switch 3 and the fourth switch 6, the series-parallel relationship of the battery cells in the second battery module 7 can be changed. Battery_-, Battery1_+, and Battery2_+ in the figure represent the first power supply terminal, the second power supply terminal, and the third power supply terminal, respectively. Figure 2 a1 and A1 represent the first pole and the second pole of the first battery cell, a2 and A2 represent the first pole and the second pole of the second battery cell, and a3 and A3 represent the first pole and the second pole of the third battery cell.

[0037] The first pole of the first battery cell is connected to the first bus terminal, which is switchably connected to the second pole or the first power supply terminal of the first battery module 1 through the first switch 4; the second pole of the third battery cell is connected to the second bus terminal, which is connected to the third power supply terminal.

[0038] The third switch 3 includes a first sub-switch, a second sub-switch, a third sub-switch and a fourth sub-switch. The first pole of the first battery cell is connected to the first bus terminal. The first pole of the second battery cell can be connected to the first bus terminal through the first sub-switch and the second sub-switch. The first pole of the third battery cell can be connected to the first bus terminal through the second sub-switch; the second pole of the first battery cell can be connected to the second bus terminal through the third sub-switch; and the second pole of the second battery cell can be connected to the second bus terminal through the fourth sub-switch.

[0039] The first switch unit and the second switch unit can be configured as: the first sub-switch, the second sub-switch, the third sub-switch and the fourth sub-switch are closed, while the fourth switch 6 and the second switch 5 are opened, and the first switch 4 is connected to the first bus terminal and the second pole of the first battery module 1 to connect the first battery cell, the second battery cell and the third battery cell in parallel, and the first battery module 1 and the second battery module 7 are connected in series to supply power through the first power supply terminal and the third power supply terminal.

[0040] As shown in FIG. 3( a ), it is an equivalent circuit diagram of the power supply system in high-voltage mode. When the power supply system enters the high-voltage mode, the first battery module 1 and the second battery module 7 are connected in series to provide a higher voltage.

[0041] Exemplarily, the fourth switch 6 includes a fifth sub-switch and a sixth sub-switch, the second pole of the first battery cell is connectable to the first pole of the second battery cell through the fifth sub-switch, and the second pole of the second battery cell is connectable to the first pole of the third battery cell through the sixth sub-switch.

[0042] The first switch unit and the second switch unit can be configured as: the third switch 3 is disconnected, the fifth sub-switch and the sixth sub-switch are closed, the second switch 5 is closed, and the first switch 4 is connected to the first bus terminal and the first power supply terminal; to connect the first battery cell, the second battery cell and the third battery cell in series, and to connect the first battery module 1 and the second battery module 7 in parallel to supply power through the first power supply terminal and the second power supply terminal.

[0043] As shown in FIG. 3( b ), it is an equivalent circuit diagram of the power supply system in low voltage mode. The power supply system enters the low voltage mode, the first battery module 1 and the second battery module 7 are connected in parallel, and the power supply system provides a lower voltage.

[0044] The first pole mentioned above represents the negative pole of the battery module or the battery cell, and the second pole represents the positive pole of the battery module or the battery cell.

[0045] like Figure 4 As shown, it is a schematic diagram of the state switching of the second battery module 7 in an embodiment of the present application. The third switch 3 and the fourth switch 6 in the second switch unit can change the connection state of the battery cells in the second battery module 7. When the third switch 3 is closed and the fourth switch 6 is opened, the battery cells in the second battery module 7 are connected in parallel for use in the high-voltage mode. When the third switch 3 is opened and the fourth switch 6 is closed, the battery cells in the second battery module 7 are connected in series for use in the low-voltage mode. The fourth switch 6 and the second switch 5 can be one-throw-multiple-open switches, and multiple sub-switches can be synchronously closed or opened through one adjustment.

[0046] For example, Figure 2 As shown, the system in the embodiment of the present application further includes a controller 2, and the controller 2 is electrically connected to the first switch unit and the second switch unit to control the configuration state of the first switch unit and the second switch unit. The closing and opening of the first switch 4, the third switch 3, the fourth switch 6 and the second switch 5 are all controlled by the controller 2. Exemplarily, the controller 2 can be an electronic control unit (Electronic Control Unit, referred to as ECU).

[0047] like Figure 5 As shown, it is a schematic diagram of the process of switching the power supply system state in an embodiment of the present application.

[0048] For switching to high-voltage mode, after the process starts, if the electronic control unit receives a signal requesting high-voltage mode, it will first confirm the current state. If it is currently in low-voltage mode, it will control the first switch unit and the second switch unit to enter high-voltage mode. The controller controls the first switch unit and the second switch unit as follows:

[0049] The first switch 4 ( Figure 2Reg_S1 in ) requests to switch to the second switch terminal Switch2; the third switch 3 ( Figure 2 ParaFour_S in (ParaFour_S) requests closure; the fourth switch 6 ( Figure 2 TandTwo_S in the request to disconnect; the second switch 5 ( Figure 2 By configuring in this way, the first battery module 1 and the second battery module 7 can be connected in series and provide high voltage output.

[0050] The controller 2 exchanges the high voltage positive pole command to the third power supply terminal to be effective (that is, Figure 2 Battery1_+ in is valid); the controller 2 externally exchanges high voltage positive pole commands and the second power supply terminal is invalid (that is, Figure 2 The current mode of controller 2's external interaction is "high voltage mode".

[0051] If the current working state is already the high voltage mode, the controller 2 controls the first switch unit and the second switch unit as follows:

[0052] The first switch 4 ( Figure 2 The Reg_S1 command in the last moment maintains the state; the third switch 3 ( Figure 2 The ParaFour_S command in the command maintains the state of the previous moment; the fourth switch 6 ( Figure 2 The TandTwo_S command in the command maintains the state of the previous moment; the second switch 5 ( Figure 2 The Reg_S2) command in the above command maintains the state at the last moment. This configuration can keep the first battery module 1 and the second battery module 7 connected in series and provide a high voltage output.

[0053] The controller 2 externally interacts with the high-voltage positive pole command of the third power supply terminal and the controller 2 externally interacts with the high-voltage positive pole command of the second power supply terminal and the controller 2 externally interacts with the current mode of the controller 2 externally in the "high-voltage mode".

[0054] For switching to low-voltage mode, after the process starts, if the electronic control unit receives a signal requesting low-voltage mode, it will first confirm the current state. If it is currently in high-voltage mode, it will control the first switch unit and the second switch unit to enter low-voltage mode. The controller 2 controls the first switch unit and the second switch unit as follows:

[0055] The first switch 4 ( Figure 2 Reg_S1 in ) requests to switch to the first switch terminal Switch1; the third switch 3 ( Figure 2 ParaFour_S in (ParaFour_S) requests disconnection; the fourth switch 6 ( Figure 2TandTwo_S in the request is closed; the second switch 5 ( Figure 2 By configuring in this way, the first battery module 1 and the second battery module 7 can be connected in parallel and provide a low voltage output.

[0056] The controller 2 exchanges the high voltage positive pole command to the external power supply terminal to be effective (that is, Figure 2 Battery2_+ in is valid); the controller 2 externally exchanges high voltage positive pole commands and the third power supply terminal is invalid (that is, Figure 2 The current mode of controller 2's external interaction is "low voltage mode".

[0057] If the current working state is already the low voltage mode, the controller 2 controls the first switch unit and the second switch unit as follows:

[0058] The first switch 4 ( Figure 2 The Reg_S1 command in the last moment maintains the state; the third switch 3 ( Figure 2 The ParaFour_S command in the command maintains the state of the previous moment; the fourth switch 6 ( Figure 2 The TandTwo_S command in the command maintains the state of the previous moment; the second switch 5 ( Figure 2 The Reg_S2) command in the previous moment maintains the state. This configuration can keep the first battery module 1 and the second battery module 7 in parallel and provide a low voltage output state.

[0059] The controller 2 externally interacts with the high-voltage positive pole command of the second power supply terminal and the controller 2 externally interacts with the high-voltage positive pole command of the third power supply terminal and the controller 2 externally interacts with the current mode of the controller 2 externally in the "low-voltage mode".

[0060] For example, Figure 5 The default working condition in can be a high pressure mode or a low pressure mode, and can be adjusted according to actual needs. If the controller 2 does not receive the request signal, the first switch unit and the second switch unit are controlled to adjust according to the configuration mode of the default working condition.

[0061] The power supply system in the present application connects the first battery module and the second battery module together through the first switch unit. The connection mode between the first battery module and the second battery module can be changed by adjusting the switch. When the first battery module and the second battery module are connected in series, the total voltage is higher. When the first battery module and the second battery module are connected in parallel, the total voltage is lower. The power supply system in the present application can adjust the supply voltage of the battery pack by adjusting the first switch unit to meet the use requirements in different situations, and is more flexible and convenient to use.

[0062] Embodiment 2

[0063] An embodiment of the present application provides a power supply system, which includes: a first battery module, a second battery module and a first switch unit.

[0064] The first pole of the first battery module is connected to the first power supply terminal, and the second pole of the first battery module is connected to the second power supply terminal. The second pole of the second battery module is connected to the third power supply terminal. The first switch unit is configured to: connect the first battery module and the second battery module in series and supply power through the first power supply terminal and the third power supply terminal, or connect the first battery module and the second battery module in parallel and supply power through the first power supply terminal and the second power supply terminal.

[0065] like Figure 6 As shown, the difference between the embodiment of the present application and the above-mentioned embodiment is that the embodiment of the present application includes at least two second battery modules 7. For each second battery module 7, a set of second switch units will be correspondingly set. As mentioned above, the first switch unit includes a first switch 4 and a second switch 5, and the second switch unit includes a third switch 3 and a fourth switch 6. The first poles of two adjacent second battery modules 7 are connected by two first switches 4, and the first pole of each second battery module 7 is switchably connected to the first power supply terminal or the second pole of the first battery module 1 through the first switch 4. The second pole of the second battery module 7 is connected to the third power supply terminal in a switchable manner through the second switch 5 on the adjacent second battery membrane.

[0066] Similar to the configuration of the first switch unit and the second switch unit described above, when the switching ends of all the first switches 4 are set to switch2, all the third switches 3 are turned on, and all the fourth switches 6 and the second switches 5 are disconnected, the first battery module 1 and all the second battery modules can be connected in series to enter the high voltage mode.

[0067] Similarly, when the switching ends of all first switches 4 are set to switch1, all third switches 3 are disconnected, and all fourth switches 6 and second switches 5 are closed, the first battery module 1 and all second battery modules can be connected in parallel to enter the low voltage mode.

[0068] The circuit diagram of two groups of second battery modules 7 is provided in the embodiment of the present application, but in actual use, a suitable number of second battery modules 7 can be selected according to the situation.

[0069] The power supply system in the embodiment of the present application connects the first battery module 1 and the second battery module 7 together through the first switch unit. The connection mode between the first battery module 1 and the second battery module 7 can be changed by adjusting the first switch unit. When the first battery module 1 and the second battery module 7 are connected in series, the total voltage is higher. When the first battery module 1 and the second battery module 7 are connected in parallel, the total voltage is lower. The power supply system in the present application can adjust the supply voltage of the battery pack by adjusting the first switch unit to meet the use requirements in different situations, and is more flexible and convenient to use.

[0070] Embodiment 3

[0071] The embodiment of the present application provides a battery pack, which includes the power supply system in the above embodiment. The embodiment of the present application also provides a vehicle, which includes the above battery pack or the above power supply system.

[0072] Although example embodiments have been described herein with reference to the accompanying drawings, it should be understood that the above example embodiments are merely exemplary and are not intended to limit the scope of the present application to this. Those of ordinary skill in the art may make various changes and modifications therein without departing from the scope and spirit of the present application. All these changes and modifications are intended to be included within the scope of the present application as required by the appended claims.

[0073] In the description provided herein, a large number of specific details are described. However, it is understood that the embodiments of the present application can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0074] Similarly, it should be understood that in order to streamline the present application and help understand one or more of the various inventive aspects, in the description of the exemplary embodiments of the present application, the various features of the present application are sometimes grouped together into a single embodiment, figure, or description thereof. However, the method of the present application should not be interpreted as reflecting the following intention: the claimed application requires more features than the features clearly stated in each claim. More specifically, as reflected in the corresponding claims, the inventive point is that the corresponding technical problem can be solved with features less than all the features of a single disclosed embodiment. Therefore, the claims following the specific embodiment are hereby explicitly incorporated into the specific embodiment, wherein each claim itself serves as a separate embodiment of the present application.

[0075] It will be understood by those skilled in the art that, except for mutually exclusive features, all features disclosed in this specification (including the accompanying claims, abstracts and drawings) and all processes or units of any method or device disclosed in this specification may be combined in any combination. Unless otherwise expressly stated, each feature disclosed in this specification (including the accompanying claims, abstracts and drawings) may be replaced by an alternative feature that provides the same, equivalent or similar purpose.

[0076] In addition, those skilled in the art will appreciate that, although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present application and form different embodiments. For example, in the claims, any one of the claimed embodiments may be used in any combination.

[0077] The above is only a specific implementation or description of a specific implementation of the present application, and the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. The protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A power supply system, characterized in that: The system comprises: A first battery module, wherein a first electrode of the first battery module is connected to a first power supply terminal, and a second electrode of the first battery module is connected to a second power supply terminal; a second battery module, wherein a second electrode of the second battery module is connected to a third power supply terminal; A first switch unit, wherein the first switch unit is configured to: connect the first battery module and the second battery module in series and supply power through the first power supply terminal and the third power supply terminal, or connect the first battery module and the second battery module in parallel and supply power through the first power supply terminal and the second power supply terminal.

2. The system according to claim 1, characterized in that The first switch unit comprises: a first switch, wherein the first pole of the second battery module is switchably connected to the first power supply end or the second pole of the first battery module through the first switch; A second switch, wherein the second pole of the second battery module can be connected to the second power supply end in an on-off manner through the second switch.

3. The system according to claim 2, characterized in that The first switch is a single-pole double-throw switch, the common end of the first switch is connected to the first pole of the second battery module, the first switching end of the first switch is connected to the first power supply end, and the second switching end of the first switch is connected to the second pole of the first battery module.

4. The system according to claim 2, characterized in that The second switch is a single-pole single-throw switch, a first end of the second switch is connected to the second power supply end, and a second end of the second switch is connected to the second pole of the second battery module.

5. The system according to any one of claims 1 to 4, characterized in that: The second battery module comprises: At least two cells; The second switch unit is configured to connect the at least two battery cells in series or connect the at least two battery cells in parallel.

6. The system according to claim 5, characterized in that The first switch unit is configured as: In the case where the at least two battery cells are connected in series, the first battery module and the second battery module are connected in parallel to supply power through the first power supply terminal and the second power supply terminal; or In the case where the at least two battery cells are connected in parallel, the first battery module and the second battery module are connected in series to supply power through the first power supply terminal and the third power supply terminal.

7. The system according to claim 5, characterized in that The second switch unit comprises: a third switch, wherein the first pole of at least one of the battery cells can be connected to the third power supply end through the third switch, and the second pole of at least one of the battery cells can be connected to the second pole of the second battery module through the third switch; a fourth switch, wherein the second pole of at least one of the battery cells can be connected to the first pole of the adjacent battery cell in an on-off manner through the fourth switch; The second switch unit is configured as follows: The third switch is closed and the fourth switch is opened, so that the at least two battery cells are connected in parallel; or the third switch is opened and the fourth switch is closed, so that the at least two battery cells are connected in series.

8. The system according to claim 5, characterized in that The second battery module includes a first battery cell, a second battery cell and a third battery cell, wherein the first electrode of the first battery cell is connected to the first bus terminal, and the first bus terminal is switchably connected to the second electrode of the first battery module or the first power supply terminal through the first switch; the second electrode of the third battery cell is connected to the second bus terminal, and the second bus terminal is connected to the third power supply terminal; The second bus terminal is also connected to the second power supply terminal in an on-off manner through the second switch.

9. The system according to any one of claims 6 to 8, characterized in that: The system further includes a controller electrically connected to the first switch unit and the second switch unit to control the configuration states of the first switch unit and the second switch unit.

10. The system according to any one of claims 6 to 8, characterized in that: The first battery module and the second battery module have the same number of battery cells.

11. The system according to any one of claims 6 to 8, characterized in that: After the battery cells in the second battery module are connected in series, the voltage of the second battery module is the same as the voltage of the first battery module.

12. A battery pack, characterized in that: The battery pack includes the power supply system according to any one of claims 1-11.

13. A vehicle, characterized in that: The vehicle includes the battery pack according to claim 12, or includes the power supply system according to any one of claims 1-11.

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