Power supply circuit

Abstract

The invention relates to the technical field of vehicles, and provides a power supply circuit which comprises a first voltage conversion module, a power battery, a storage battery, a low-voltage output end and a high-voltage output end, and the storage battery, the power battery and the first voltage conversion module are arranged in a power battery pack shell; the first voltage conversion module is respectively connected with the power battery and the storage battery, and is used for converting a first power supply voltage output by the power battery into a charging voltage according to the charging signal and charging the storage battery; the storage battery is connected with the low-voltage output end and used for outputting second power supply voltage to the low-voltage output end; wherein the first power supply voltage is higher than the second power supply voltage; the power battery is further connected with the high-voltage output end and used for outputting the first power supply voltage to the high-voltage power supply end. According to the technical scheme, the problem that in the prior art, a storage battery needs to occupy a certain arrangement space at the front end of the vehicle, and consequently the cost of the vehicle is increased can be solved.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a power supply circuit. Background Art

[0002] In the current vehicle electrical system, the low-voltage power supply device is a battery, which is usually installed at the front end of the vehicle. In order to ensure the capacity of the battery, the battery is large in size and requires a certain layout space, which increases the cost of the vehicle. Summary of the invention

[0003] In view of the above problems, the present application provides a power supply circuit for solving the problem in the prior art that the battery needs to occupy a certain layout space at the front end of the vehicle, thereby increasing the cost of the vehicle.

[0004] According to one aspect of an embodiment of the present application, a power supply circuit is provided, which includes: a first voltage conversion module, a power battery, a storage battery, a low voltage output end and a high voltage output end, wherein the storage battery, the power battery and the first voltage conversion module are arranged inside a power battery pack shell; the first voltage conversion module is respectively connected to the power battery and the storage battery, and is used to convert a first power supply voltage output by the power battery into a charging voltage according to a charging signal, and charge the storage battery; the storage battery is connected to the low voltage output end, and is used to output a second power supply voltage to the low voltage output end; wherein the first power supply voltage is higher than the second power supply voltage; the power battery is also connected to the high voltage output end, and is also used to output the first power supply voltage to the high voltage power supply end.

[0005] In an optional embodiment, the first voltage conversion module includes: a first control unit; the first control unit is connected to the power battery and the storage battery respectively, and is used to generate the charging signal when it is detected that the power value of the power battery is greater than a preset power battery power value and the power value of the storage battery is less than a preset storage battery power value.

[0006] In an optional embodiment, the first voltage conversion module also includes: a first voltage conversion unit and a first switch unit; the first voltage conversion unit is respectively connected to the first control unit and the power battery, and is used to convert the first supply voltage output by the power battery into a charging voltage according to a charging signal output by the first control unit; the first switch unit is respectively connected to the first control unit, the first voltage conversion unit and the battery, and is used to close according to the charging signal issued by the first control unit, so that the first voltage conversion unit transmits the charging voltage to the battery to charge the battery.

[0007] In an optional embodiment, the first control unit is also used to generate a backup power supply signal when a battery failure is detected and the power value of the power battery is greater than a preset power battery power value; the first voltage conversion unit is also used to convert the first supply voltage into the second supply voltage according to the backup power supply signal issued by the first control unit; the first switch unit is also used to close the backup power supply signal issued by the first control unit, so that the second supply voltage is transmitted to the low-voltage power supply end through the battery.

[0008] In an optional embodiment, the first voltage conversion unit includes: a first MOS tube, a second MOS tube, a first inductor, a first capacitor and a first resistor; the gate of the first MOS tube is connected to the first control unit, the drain of the first MOS tube is connected to the first output end of the power battery, and the source of the first MOS tube is respectively connected to the drain of the second MOS tube and the first end of the first inductor; the gate of the second MOS tube is connected to the first control unit, and the source of the second MOS tube is respectively connected to the second end of the first capacitor, the second end of the first resistor and the second output end of the power battery; the second end of the first inductor is respectively connected to the first end of the first capacitor, the first end of the first resistor and the first end of the first switch unit.

[0009] In an optional embodiment, the power supply circuit also includes: a second voltage conversion module; the second voltage conversion module is wirelessly connected to the first voltage conversion module, and is also respectively connected to the high voltage output end and the low voltage output end, and is used to convert the first power supply voltage output from the high voltage output end into the second power supply voltage according to a fault signal sent by the first voltage conversion module, and output the second power supply voltage to the low voltage output end.

[0010] In an optional embodiment, the second voltage conversion module includes: a second control unit; the second control unit is wirelessly connected to the first control unit and is used to receive a fault signal sent by the first control unit.

[0011] In an optional embodiment, the second voltage conversion module also includes: a second voltage conversion unit; the second voltage conversion unit is respectively connected to the second control unit, the high voltage output end and the low voltage output end, and is used to convert the first power supply voltage output by the high voltage output end into the second power supply voltage according to a fault signal sent by the second control unit, and output the second power supply voltage to the low voltage output end.

[0012] In an optional embodiment, the second voltage conversion unit includes: a third MOS tube, a diode, a second inductor, a third capacitor and a second resistor; the gate of the third MOS tube is connected to the second control unit, the source of the third MOS tube is connected to the first output end of the power battery, and the drain of the third MOS tube is respectively connected to the first end of the second inductor and the cathode of the diode; the anode of the diode is respectively connected to the third capacitor, the second end of the second resistor and the second output end of the power battery; the second end of the second inductor is respectively connected to the first end of the third capacitor and the first end of the second resistor.

[0013] In an optional embodiment, the second switch unit further includes: a fourth capacitor; two ends of the fourth capacitor are respectively connected to the first output end and the second output end of the power battery.

[0014] The present application integrates the storage battery into the power battery by placing the first voltage conversion module, the power battery, and the storage battery inside the power battery pack shell, and the power battery is placed on the chassis of the vehicle, thereby saving the independent arrangement space of the storage battery at the front end of the vehicle, thereby saving the cost of the vehicle. The present application converts the first power supply voltage output by the power battery into a charging voltage acceptable to the storage battery through the first voltage conversion module, thereby realizing the charging of the storage battery. After the storage battery is charged, the second power supply voltage can be output to the low-voltage output end. After the low-voltage load is connected to the low-voltage power supply end, it can work according to the second power supply voltage provided by the low-voltage power supply end; at the same time, the power battery provides the first power supply voltage to the high-voltage output end. When the high-voltage load is connected to the high-voltage power supply end, it can work according to the first power supply voltage provided by the high-voltage load, thereby realizing that the power battery outputs the first power supply voltage and the second power supply voltage at the same time to meet the needs of different levels of voltage loads.

[0015] The above description is only an overview of the technical solution of the embodiment of the present application. In order to more clearly understand the technical means of the embodiment of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the embodiment of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are only used to illustrate the embodiments and are not to be considered as limiting the present application. In addition, the same reference symbols are used to represent the same components throughout the accompanying drawings. In the accompanying drawings:

[0017] Figure 1 A structural diagram of a first embodiment of a power supply circuit provided by the present application is shown.

[0018] Figure 2 A structural diagram of a second embodiment of a power supply circuit provided by the present application is shown.

[0019] Figure 3 A circuit diagram of a power supply circuit provided by the present application is shown. DETAILED DESCRIPTION

[0020] Here, exemplary embodiments will be described in detail, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are only examples of devices and methods consistent with some aspects of the present application as detailed in the attached claims.

[0021] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities may be implemented in software form, or in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0022] The flowcharts shown in the accompanying drawings are only exemplary and do not necessarily include all the contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps can be decomposed, and some operations / steps can be combined or partially combined, so the actual execution order may change according to actual conditions.

[0023] The term "multiple" as used in this application refers to two or more than two. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the related objects are in an "or" relationship.

[0024] Figure 1 1 shows a structural diagram of a first embodiment of a power supply circuit provided by the present application. Figure 1 As shown, the power supply circuit includes: a first voltage conversion module 110, a power battery 130, a storage battery 120, a low voltage output terminal 140 and a high voltage output terminal 150, and the storage battery 120, the power battery 130 and the first voltage conversion module 110 are arranged inside the power battery pack housing 100;

[0025] The first voltage conversion module 110 is connected to the power battery 130 and the storage battery 120 respectively, and is used to convert the first supply voltage output by the power battery 130 into a charging voltage according to the charging signal, and charge the storage battery 120;

[0026] The storage battery 120 is connected to the low voltage output terminal 140, and is used to output a second supply voltage to the low voltage output terminal 140; wherein the first supply voltage is higher than the second supply voltage;

[0027] The power battery 130 is also connected to the high-voltage output terminal 150 , and is also used to output the first power supply voltage to the high-voltage power supply terminal.

[0028] In this embodiment, the first voltage conversion module 110, the power battery 130, and the storage battery 120 are arranged inside the power battery pack housing 100, so that the storage battery 120 is integrated into the power battery 130, and the power battery pack is arranged on the chassis of the vehicle, thereby saving the independent arrangement space of the storage battery 120 at the front end of the vehicle, thereby saving the cost of the vehicle, and the storage battery 120 and the power battery 130 can be lithium batteries, compared with the prior art using lead-acid batteries, the volume of the power battery pack can be further reduced, saving the arrangement space of the vehicle. In this embodiment, the first voltage conversion module 110 converts the first power supply voltage output by the power battery 130 into a charging voltage acceptable to the storage battery 120, thereby realizing the charging of the storage battery 120. After the storage battery 120 is charged, the second power supply voltage can be output to the low-voltage output terminal 140. After the low-voltage load is connected to the low-voltage power supply terminal, it can work according to the second power supply voltage provided by the low-voltage power supply terminal; at the same time, the power battery 130 provides the first power supply voltage to the high-voltage output terminal 150. When the high-voltage load is connected to the high-voltage power supply terminal, it can work according to the first power supply voltage provided by the high-voltage load, thereby realizing that the power battery 130 outputs the first power supply voltage and the second power supply voltage at the same time to meet the needs of voltage loads of different levels.

[0029] Figure 2 2 shows a structural diagram of a second embodiment of a power supply circuit provided by the present application. Figure 2 As shown, the first voltage conversion module 110 includes: a first control unit 111; the first control unit 111 is connected to the power battery 130 and the storage battery 120 respectively, and is used to generate the charging signal when it is detected that the power value of the power battery 130 is greater than the preset power value of the power battery 130 and the power value of the storage battery 120 is less than the preset power value of the storage battery 120.

[0030] In this embodiment, the first control unit 111 is a controller of the first voltage conversion module 110, which can detect the power value of the battery 120 to determine whether the power value of the battery 120 is used up, thereby determining whether the battery 120 needs to be charged, and detect the power value of the power battery 130 to determine whether the power value of the power battery 130 is used up, thereby determining whether the power battery 130 can charge the battery 120. If it is determined that the power value of the power battery 130 is greater than the preset power value of the power battery 130 and the power value of the battery 120 is less than the preset power value of the battery 120, it can be determined that the power battery 130 charges the battery 120, thereby generating a charging signal.

[0031] In another embodiment of the present application, please refer to Figure 2 As shown, the first voltage conversion module 110 further includes: a first voltage conversion unit 112 and a first switch unit 113;

[0032] The first voltage conversion unit 112 is connected to the first control unit 111 and the power battery 130 respectively, and is used to convert the first supply voltage output by the power battery 130 into a charging voltage according to the charging signal output by the first control unit 111;

[0033] The first switch unit 113 is respectively connected to the first control unit 111, the first voltage conversion unit 112 and the battery 120, and is used to close according to the charging signal sent by the first control unit 111, so that the first voltage conversion unit 112 transmits the charging voltage to the battery 120 to charge the battery 120.

[0034] In this embodiment, the first voltage conversion unit 112 converts the first supply voltage output by the power battery 130 into a charging voltage to enable charging of the battery 120. At the same time, the first switch unit 113 also receives a charging signal and closes according to the charging signal, so that the first voltage conversion unit 112 transmits the charging voltage to the battery 120 to charge the battery 120.

[0035] In another embodiment of the present application, the first control unit is further configured to generate a backup power supply signal when a failure of the storage battery is detected and the power value of the power battery is greater than a preset power battery power value;

[0036] The first voltage conversion unit is further used to convert the first supply voltage into the second supply voltage according to the backup power supply signal sent by the first control unit;

[0037] The first switch unit is also used to close the backup power supply signal sent by the first control unit, so that the second power supply voltage is transmitted to the low-voltage power supply end through the battery.

[0038] In this embodiment, when the battery is normal and fully charged, the first control unit is disconnected, and the battery provides the second power supply voltage to the low-voltage power supply terminal. The first control unit will perform real-time detection on the battery. If a battery failure is detected, for example, when the battery is detected to continuously input a low voltage or the battery cannot output a voltage, and when the power value of the power battery is detected to be greater than the preset power battery power value, it means that the power value of the power battery is sufficient, and a backup power supply signal is generated. The first voltage conversion unit converts the first power supply voltage output by the power battery into the second power supply voltage according to the backup power supply signal, so that the second power supply voltage can be output to the low-voltage power supply terminal; when the battery fails, the battery is equivalent to a wire, and after the first switch unit is closed according to the backup power supply signal, the second power supply voltage output by the first voltage conversion unit can be directly transmitted to the low-voltage power supply terminal for use by the low-voltage load. For example, when the battery fails, if the vehicle is not started, the second power supply voltage provided by the battery can still power the vehicle controller to start the vehicle; when the vehicle needs to be powered off, the second power supply voltage provided by the battery can still power the vehicle controller to power off the vehicle; it should be noted that when the vehicle is in the awake state and the sleep state, the power battery will always output the first power supply voltage to the first voltage conversion module, and the first voltage conversion low-power module will consume very little power.

[0039] Figure 3 A circuit diagram of a power supply circuit provided by the present application is shown. Figure 3 As shown, the first voltage conversion unit 112 includes: a first MOS transistor Q1, a second MOS transistor Q2, a first inductor L1, a first capacitor C1 and a first resistor R1; the gate of the first MOS transistor Q1 is connected to the first control unit 111, the drain of the first MOS transistor Q1 is connected to the first output end of the power battery 130, and the source of the first MOS transistor Q1 is respectively connected to the drain of the second MOS transistor Q2 and the first end of the first inductor L1; the gate of the second MOS transistor Q2 is connected to the first control unit 111, and the source of the second MOS transistor Q2 is respectively connected to the second end of the first capacitor C1, the second end of the first resistor R1 and the second output end of the power battery 130; the second end of the first inductor L1 is respectively connected to the first end of the first capacitor C1, the first end of the first resistor R1 and the first end of the first switch unit 113. The first voltage conversion unit 112 also includes: a second capacitor C2; the two ends of the second capacitor C2 are respectively connected to the first output end and the second output end of the power battery 130.

[0040] In this embodiment, illustratively, the first MOS tube Q1 and the second MOS tube Q2 can be periodically turned on or off according to the received charging signal. When the first MOS tube Q1 is turned on and the second MOS tube Q2 is turned off, the first power supply voltage output by the power battery 130 provides voltage to the first resistor R1, and the first inductor L1 offsets a part of the first power supply voltage. When the first MOS tube Q1 is turned off and the second MOS tube Q2 is turned on, the input first power supply voltage cannot provide voltage to the first resistor R1, and the voltage provided by the first capacitor C1 and the first inductor L1 to the first resistor R1 drops in a short time, thereby realizing the first power supply voltage is stepped down to the charging voltage or the second power supply voltage. It should be noted that the second capacitor C2 functions to filter the first power supply voltage output by the power battery 130, so as to make the output first power supply voltage more stable.

[0041] In another embodiment of the present application, please refer to Figure 2 As shown, the power supply circuit also includes: a second voltage conversion module 200; the second voltage conversion module 200 is wirelessly connected to the first voltage conversion module 110, and is also respectively connected to the high voltage output terminal 150 and the low voltage output terminal 140, and is used for converting the first power supply voltage output by the high voltage output terminal 150 into the second power supply voltage according to the fault signal sent by the first voltage conversion module 110, and outputting the second power supply voltage to the low voltage output terminal 140.

[0042] In this embodiment, since the first voltage conversion module 110 may fail, when the first voltage conversion module 110 fails, if the battery 120 is low in power, the battery 120 will not be able to charge, and thus will not be able to output the second supply voltage. When the second voltage conversion module 200 receives a fault signal from the first voltage conversion module 110, it converts the first supply voltage output from the high-voltage output terminal 150 into a second supply voltage and outputs it to the low-voltage output terminal 140, so as to replace the battery 120 in outputting the second supply voltage, thereby ensuring the power supply demand of the low-voltage load.

[0043] In another embodiment of the present application, please refer to Figure 2 As shown, the second voltage conversion module 200 includes: a second control unit 211 ; the second control unit 211 is wirelessly connected to the first control unit 111 , and is used to receive a fault signal sent by the first control unit 111 .

[0044] The second voltage conversion module 200 also includes: a second voltage conversion unit 212; the second voltage conversion unit 212 is respectively connected to the second control unit 211, the high voltage output terminal 150 and the low voltage output terminal, and is used to convert the first power supply voltage output by the high voltage output terminal 150 into the second power supply voltage according to the fault signal sent by the second control unit 211, and output the second power supply voltage to the low voltage output terminal 140.

[0045] In this embodiment, exemplarily, the first control module that fails is usually the first voltage conversion unit 112. After the first control unit 111 detects that the first voltage conversion unit 112 has failed, it sends a fault signal to the second conversion unit of the second conversion module. The second conversion unit converts the first power supply voltage output by the high-voltage output terminal 150 into a second power supply voltage, and outputs it to the low-voltage output terminal 140, so that when the second power supply module fails, it can provide the second power supply voltage to the low-voltage load.

[0046] In another embodiment of the present application, please refer to Figure 3 As shown, the second voltage conversion unit 212 includes: a third MOS tube Q3, a diode D1, a second inductor L2, a third capacitor C3 and a second resistor R2; the gate of the third MOS tube Q3 is connected to the second control unit 211, the source of the third MOS tube Q3 is connected to the first output end of the power battery 130, and the drain of the third MOS tube Q3 is respectively connected to the first end of the second inductor L2 and the negative electrode of the diode D1; the positive electrode of the diode D1 is respectively connected to the third capacitor C3, the second end of the second resistor R2 and the second output end of the power battery 130; the second end of the second inductor L2 is respectively connected to the first end of the third capacitor C3 and the first end of the second resistor R2. The second switch unit also includes: a fourth capacitor C4; the two ends of the fourth capacitor C4 are respectively connected to the first output end and the second output end of the power battery 130.

[0047] In the present embodiment, illustratively, the third MOS tube Q3 can be periodically turned on or off according to the received fault signal. When the third MOS tube Q3 is turned on, the diode D1 is turned off, and the first power supply voltage output by the power battery 130 provides voltage to the second resistor R2. The second inductor L2 will offset a part of the first power supply voltage. When the third MOS tube Q3 is turned off, the diode D1 is turned on, and the input first power supply voltage cannot provide voltage to the first resistor R1. The voltage provided to the second resistor R2 by the third capacitor C3 and the second inductor L2 drops in a short time, thereby achieving the goal of reducing the first power supply voltage to the second power supply voltage. It should be noted that the role of the fourth capacitor C4 is to filter the first power supply voltage output by the power battery 130, so as to make the output first power supply voltage more stable. It should be noted that the first control unit 111 and the second control unit 211 are in Figure 3 Not shown in the figure.

[0048] The above content is only a preferred exemplary embodiment of the present application and is not intended to limit the implementation scheme of the present application. A person skilled in the art can easily make corresponding changes or modifications based on the main concept and spirit of the present application. Therefore, the scope of protection of the present application shall be based on the scope of protection required by the claims.

Claims

1. A power supply circuit, characterized in that: The power supply circuit comprises: a first voltage conversion module, a power battery, a storage battery, a low voltage output terminal and a high voltage output terminal, wherein the storage battery, the power battery and the first voltage conversion module are arranged inside the power battery pack housing; The first voltage conversion module is connected to the power battery and the storage battery respectively, and is used to convert the first supply voltage output by the power battery into a charging voltage according to the charging signal, and charge the storage battery; The storage battery is connected to the low-voltage output terminal and is used to output a second supply voltage to the low-voltage output terminal; wherein the first supply voltage is higher than the second supply voltage; The power battery is also connected to the high-voltage output terminal, and is also used to output the first power supply voltage to the high-voltage power supply terminal.

2. The power supply circuit according to claim 1, characterized in that: The first voltage conversion module includes: a first control unit; The first control unit is connected to the power battery and the storage battery respectively, and is used to generate the charging signal when it is detected that the power value of the power battery is greater than a preset power battery power value and the power value of the storage battery is less than a preset storage battery power value.

3. The power supply circuit according to claim 2, characterized in that: The first voltage conversion module further includes: a first voltage conversion unit and a first switch unit; The first voltage conversion unit is connected to the first control unit and the power battery respectively, and is used to convert the first supply voltage output by the power battery into a charging voltage according to the charging signal output by the first control unit; The first switch unit is connected to the first control unit, the first voltage conversion unit and the battery respectively, and is used to close according to the charging signal sent by the first control unit, so that the first voltage conversion unit transmits the charging voltage to the battery to charge the battery.

4. The power supply circuit according to claim 3, characterized in that: The first control unit is further configured to generate a backup power supply signal when a battery failure is detected and the power value of the power battery is greater than a preset power battery power value; The first voltage conversion unit is further used to convert the first supply voltage into the second supply voltage according to the backup power supply signal sent by the first control unit; The first switch unit is also used to close the backup power supply signal sent by the first control unit, so that the second power supply voltage is transmitted to the low-voltage power supply end through the battery.

5. The power supply circuit according to claim 3, characterized in that: The first voltage conversion unit includes: a first MOS tube, a second MOS tube, a first inductor, a first capacitor and a first resistor; The gate of the first MOS transistor is connected to the first control unit, the drain of the first MOS transistor is connected to the first output end of the power battery, and the source of the first MOS transistor is connected to the drain of the second MOS transistor and the first end of the first inductor respectively; The gate of the second MOS tube is connected to the first control unit, and the source of the second MOS tube is respectively connected to the second end of the first capacitor, the second end of the first resistor, and the second output end of the power battery; The second end of the first inductor is respectively connected to the first ends of the first two capacitors, the first end of the first resistor and the first end of the first switch unit.

6. The power supply circuit according to claim 2, characterized in that: The power supply circuit further includes: a second voltage conversion module; The second voltage conversion module is wirelessly connected to the first voltage conversion module, and is also connected to the high voltage output end and the low voltage output end respectively, and is used to convert the first supply voltage outputted from the high voltage output end into the second supply voltage according to a fault signal sent by the first voltage conversion module, and output the second supply voltage to the low voltage output end.

7. The power supply circuit according to claim 6, characterized in that: The second voltage conversion module includes: a second control unit; The second control unit is wirelessly connected to the first control unit and is used to receive a fault signal sent by the first control unit.

8. The power supply circuit according to claim 7, characterized in that: The second voltage conversion module further includes: a second voltage conversion unit; The second voltage conversion unit is respectively connected to the second control unit, the high voltage output end and the low voltage output end, and is used to convert the first supply voltage output by the high voltage output end into the second supply voltage according to a fault signal sent by the second control unit, and output the second supply voltage to the low voltage output end.

9. The power supply circuit according to claim 8, characterized in that: The second voltage conversion unit includes: a third MOS tube, a diode, a second inductor, a third capacitor and a second resistor; The gate of the third MOS tube is connected to the second control unit, the source of the third MOS tube is connected to the first output end of the power battery, and the drain of the third MOS tube is connected to the first end of the second inductor and the negative electrode of the diode respectively; The anode of the diode is connected to the third capacitor, the second end of the second resistor and the second output end of the power battery respectively; The second end of the second inductor is connected to the first end of the third capacitor and the first end of the second resistor respectively.

10. The power supply circuit according to claim 9, characterized in that: The second switch unit further includes: a fourth capacitor; two ends of the fourth capacitor are respectively connected to the first output end and the second output end of the power battery.

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