Power battery power supply circuit, power battery system and electric vehicle

Abstract

The utility model discloses a power battery power supply circuit, a power battery system and an electric vehicle, a discharge branch in the power battery power supply circuit comprises a temperature detection module, a discharge relay and a discharge resistor, the discharge relay and the discharge resistor are connected in series, and one end of the discharge branch is connected to a battery cathode port directly or through a power supply cathode branch. The other end of the discharge relay is connected to a battery anode port directly or through a power supply anode branch, the temperature detection module collects the temperature of the discharge resistor, the controller is connected with the temperature detection module and the control end of the discharge relay, and the controller is configured to be connected with a power battery. The controller can control the discharge relay to be closed when the voltage or the electric quantity of the power battery is too high so that the discharge branch circuit can be switched on, the single power battery can consume electric energy through the discharge resistor in the discharge branch circuit, and the discharge branch circuit can be controlled to be switched on or switched off through the temperature, detected by the temperature detection module, of the discharge resistor. Therefore, the single power battery can safely and reliably discharge energy through the discharge branch.

Description

Technical Field

[0001] The utility model relates to the technical field of power battery power supply, and in particular to a power battery power supply circuit, a power battery system and an electric vehicle. Background Art

[0002] In electric vehicles such as new energy vehicles, ships, and aircraft, large-capacity batteries are mainly used as energy sources.

[0003] In electric vehicles, the more energy stored in the power battery, the greater the risk and harm of dangerous situations such as thermal runaway. When the power battery has a high charge and needs to be stored for a long time, the power battery needs to be discharged to reduce the risk of safety accidents.

[0004] In the prior art, a single power battery system in the high-voltage circuit of a power battery has no safe and reliable energy discharge channel. Utility Model Content

[0005] The purpose of the present invention is to provide a power battery power supply circuit, a power battery system, and an electric vehicle to solve the problem that a single power battery system in an existing power battery power supply circuit lacks a safe and reliable energy discharge channel. The embodiments of the present invention adopt the following technical solutions:

[0006] In a first aspect, a power battery power supply circuit is provided, comprising a battery negative electrode port, a battery positive electrode port, a power supply positive electrode port, a power supply negative electrode port, a power supply negative electrode branch, a power supply positive electrode branch, a discharge branch, and a controller, wherein the discharge branch comprises a temperature detection module and a discharge relay and a discharge resistor connected in series;

[0007] The negative electrode port of the battery is connected to the negative power supply port through the negative power supply branch, the positive electrode port of the battery is connected to the positive power supply port through the positive power supply branch, one end of the discharge branch is connected to the negative electrode port of the battery directly or through the negative power supply branch, and the other end of the discharge branch is connected to the positive electrode port of the battery directly or through the positive power supply branch;

[0008] The temperature detection module is used to collect the temperature of the discharge resistor. The controller is connected to the temperature detection module and the control end of the discharge relay respectively. The controller is configured to be connected to the power battery.

[0009] Optionally, it also includes an energy storage positive electrode port, an energy storage negative electrode port and an energy storage branch, the energy storage branch includes an energy storage relay, the controller is connected to the control end of the energy storage relay, one end of the energy storage branch is connected to the battery positive electrode port directly or through the power supply positive electrode branch, the other end of the energy storage branch is connected to the energy storage positive electrode port, and the energy storage negative electrode port is connected to the battery negative electrode port directly or through the power supply negative electrode branch.

[0010] Optionally, a power supply relay is provided in at least one of the positive power supply branch and the negative power supply branch, and a control end of the power supply relay is connected to the controller.

[0011] Optionally, the power supply relay includes a main positive relay arranged in the power supply positive branch, and the power supply positive branch also includes a pre-charging resistor and a pre-charging relay. The control end of the pre-charging relay is connected to the controller, and the pre-charging resistor and the pre-charging relay are connected in series and then in parallel at both ends of the main positive relay.

[0012] Optionally, it further includes a positive charging port, a negative charging port, a negative charging branch, and a positive charging branch, wherein at least one of the negative charging branch and the positive charging branch is provided with a charging relay, and a control end of the charging relay is connected to the controller;

[0013] One end of the charging negative electrode branch is connected to the battery negative electrode port through the power supply negative electrode branch, and the other end is connected to the charging negative electrode port. The charging positive electrode port is connected to the battery positive electrode port through the charging positive electrode branch.

[0014] Optionally, a charging fuse is provided in the charging negative electrode branch.

[0015] Optionally, a main positive fuse is further included, and the power supply positive branch is connected to the battery positive port through the main positive fuse.

[0016] Optionally, a current measurement module is further included, and the current measurement module is arranged in the positive power supply branch or the negative power supply branch.

[0017] In a second aspect, a power battery system is provided, comprising a power battery and the power battery power supply circuit described in any one of the first aspects, wherein the positive electrode of the power battery is connected to the positive battery port of the power battery power supply circuit, and the negative electrode of the power battery is connected to the negative battery port of the power battery power supply circuit.

[0018] In a third aspect, an electric vehicle is provided, comprising the power battery system according to the second aspect.

[0019] The power battery power supply circuit of this embodiment includes a battery negative electrode port, a battery positive electrode port, a power supply positive electrode port, a power supply negative electrode port, a power supply negative electrode branch, a power supply positive electrode branch, a discharge branch and a controller, wherein the discharge branch includes a temperature detection module and a discharge relay and a discharge resistor connected in series, the battery negative electrode port is connected to the power supply negative electrode port through the power supply negative electrode branch, the battery positive electrode port is connected to the power supply positive electrode port through the power supply positive electrode branch, one end of the discharge branch is directly or through the power supply negative electrode branch connected to the battery negative electrode port, and the other end is directly or through the power supply positive electrode branch connected to the battery The positive terminal and the temperature detection module are used to collect the temperature of the discharge resistor. The controller is respectively connected to the temperature detection module and the control end of the discharge relay. The controller is configured to be connected to the power battery. Through the power battery power supply circuit of the present invention, the controller can control the discharge relay to close when the power battery voltage or power is too high, so that the discharge branch is turned on. A single power battery can consume electric energy through the discharge resistor in the discharge branch, and the discharge branch can be turned on or off by the temperature detected by the temperature detection module, so that a single power battery can safely and reliably discharge energy through the discharge branch. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0021] Figure 1 Schematic diagram of the system architecture of the power battery power supply circuit of an embodiment of the present utility model.

[0022] Figure 2 This is a schematic diagram of an embodiment of the present invention in which a negative power supply branch and a positive power supply branch are connected via a discharge branch;

[0023] Figure 3 This is a schematic diagram of another embodiment of the present invention in which a negative power supply branch and a positive power supply branch are connected via a discharge branch;

[0024] Figure 4 This is a schematic diagram of another embodiment of the present invention in which a negative power supply branch and a positive power supply branch are connected via a discharge branch;

[0025] Figure 5 This is a schematic diagram of the system architecture of a power battery power supply circuit including an energy storage branch in an embodiment of the present utility model;

[0026] Figure 6 This is a schematic diagram of the system architecture of a power battery power supply circuit in which the negative power supply branch includes a relay in an embodiment of the present utility model;

[0027] Figure 7 This is a schematic diagram of the system architecture of a power battery power supply circuit in which both the negative power supply branch and the positive power supply branch include relays in an embodiment of the present invention;

[0028] Figure 8 This is a schematic diagram of the system architecture of a power battery power supply circuit in which the positive power supply branch includes a pre-charging relay and a pre-charging resistor in an embodiment of the present utility model;

[0029] Figure 9 Schematic diagram of the system architecture of a power battery power supply circuit including a negative charging branch and a positive charging branch in an embodiment of the present invention;

[0030] Figure 10 This is a schematic diagram of the system architecture of a power battery power supply circuit in which both the negative charging branch and the positive charging branch include relays in an embodiment of the present invention; DETAILED DESCRIPTION

[0031] To make the technical problems solved by the present invention, the technical solutions adopted, and the technical effects achieved more clearly, the technical solutions of the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work shall fall within the scope of protection of the present invention.

[0032] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0033] Figure 1 This is a schematic diagram of a power battery power supply circuit provided by an embodiment of the present invention. The power battery power supply circuit of the embodiment of the present invention can be used for powering the power battery to supply power to the outside, such as Figure 1 As shown, the power battery power supply circuit includes a battery negative terminal BAT-, a battery positive terminal BAT+, a power supply positive terminal, a power supply negative terminal, a power supply negative branch 1, a power supply positive branch 2, a discharge branch 3 and a controller 4, wherein the discharge branch 3 includes a temperature detection module and a discharge relay RL2 and a discharge resistor connected in series. The power supply negative branch 1 can be a branch provided with a switch for connecting the power supply negative terminal and the battery negative terminal BAT-, and the power supply positive branch 2 can be a branch provided with a switch for connecting the power supply positive terminal and the battery positive terminal BAT+.

[0034] Specifically, the battery negative terminal BAT- is connected to the negative power supply port through the negative power supply branch 1, the battery positive terminal BAT+ is connected to the positive power supply port through the positive power supply branch 2, one end of the discharge branch 3 is directly connected to the battery negative terminal BAT- or through the negative power supply branch 1, and the other end is directly connected to the battery positive terminal BAT+ or through the positive power supply branch 2, where direct connection may refer to direct connection through a conductive metal wire.

[0035] like Figure 1 As shown, in one embodiment, one end of the discharge branch 3 is connected to the common node A of the power supply negative branch 1 and the power supply negative port, so as to be connected to the battery negative port BAT- through the power supply negative branch 1, and the other end of the discharge branch 3 is connected to the terminal B to be directly connected to the battery positive port BAT+.

[0036] like Figure 2 As shown, in another embodiment, one end of the discharge branch 3 is connected to the common node A of the power supply negative branch 1 and the power supply negative port, so as to be connected to the battery negative port BAT- through the power supply negative branch 1, and the other end of the discharge branch 3 is connected to the common node C of the power supply positive branch 2 and the power supply positive port, so as to be connected to the battery positive port BAT+ through the power supply positive branch 2.

[0037] like Figure 3 As shown, in another embodiment, one end of the discharge branch 3 may be connected to the terminal D where the power supply negative electrode branch 1 is connected to the battery negative electrode port BAT-, so as to be directly connected to the battery negative electrode port BAT-, and the other end of the discharge branch 3 may be connected to the common node C of the power supply positive electrode branch 2 and the power supply positive electrode port, so as to be connected to the battery positive electrode port BAT+ through the power supply positive electrode branch 2.

[0038] like Figure 4 As shown, in another embodiment, one end of the discharge branch 3 is connected to the terminal D where the power supply negative electrode branch 1 is connected to the battery negative electrode port BAT-, and the other end of the discharge branch 3 is connected to the terminal B where the power supply positive electrode branch 2 is connected to the battery positive electrode port BAT-.

[0039] Of course, the discharge branch 3 is not limited to being connected to the endpoints of the negative power supply branch 1 and the positive power supply branch 2. One end of the discharge branch 3 can also be connected to the negative power supply branch 1, and the other end of the discharge branch 3 can also be connected to the positive power supply branch 2.

[0040] The temperature detection module is used to collect the temperature of the discharge resistor. The controller 4 is connected to the temperature detection module and the control end of the discharge relay RL2 respectively. The controller 4 is configured to be connected to the power battery BAT.

[0041] In this embodiment, the discharge branch 3 is used to directly or indirectly connect the positive electrode and the negative electrode of the power battery BAT to form a discharge circuit, so that the power battery BAT discharges through the formed discharge circuit to consume the electric energy of the power battery BAT, reduce the power and voltage of the power battery BAT, and achieve the effect of energy discharge of the power battery BAT.

[0042] by Figure 1 As an example, the process of discharging energy of the power battery of this embodiment is as follows:

[0043] The controller 4 communicates with the power battery BAT. When the power or voltage of the power battery BAT is too high and needs to be discharged to reduce the power, the controller 4 can control the power supply negative branch 1 to be turned on, the power supply positive branch 2 to be turned off, and the discharge relay RL2 in the discharge branch 3 to be closed. The positive and negative electrodes of the power battery BAT form an energy discharge circuit through the turned-on power supply negative branch 1 and the discharge branch 3. That is, the current of the power battery BAT flows out from the battery positive terminal BAT+, flows back to the power supply negative branch 1 through the discharge resistor in the discharge branch 3, and finally flows back to the power battery B through the battery negative terminal BAT-. The negative electrode of AT consumes the electric energy of the power battery BAT in the form of heat power when current passes through the discharge resistor. The temperature detection module detects the temperature of the discharge resistor in real time. When the temperature is greater than the threshold, the controller 4 controls the discharge relay RL2 to disconnect and stop discharging the electric energy. When the temperature is lower than the threshold, the controller controls the discharge relay RL2 to close again to continue discharging the electric energy of the power battery BAT until the electric energy of the power battery BAT is less than the electric energy threshold or the voltage reaches the voltage threshold. Through the discharge branch 3, a safe and reliable energy discharge channel is provided for the power battery BAT, so that the power battery BAT can safely and reliably discharge the electric energy.

[0044] Although the above Figure 1 This paper explains the control process of power battery when discharging energy. Figure 2-Figure 4 You can refer to Figure 1 , in addition to the need to control the discharge relay RL2 to be closed, the difference lies in whether it is necessary to control the power supply negative branch 1 and the power supply positive branch 2 to be turned on to form a discharge circuit, such as Figure 2 As shown, when discharging the discharge energy, it is necessary to control the conduction of the negative power supply branch 1 and the positive power supply branch 2. Figure 3 It is necessary to control the conduction of the positive power supply branch 2. Figure 4 Just control the discharge relay RL2 to close.

[0045] In an optional embodiment, the power battery power supply circuit also includes an energy storage positive electrode port, an energy storage negative electrode port and an energy storage branch. The energy storage branch includes an energy storage relay. The controller 4 is connected to the control end of the energy storage relay. One end of the energy storage branch is directly or through the power supply positive electrode branch 2 connected to the battery positive electrode port BAT+, the other end of the energy storage branch is connected to the energy storage positive electrode port, and the energy storage negative electrode port is directly or through the power supply negative electrode branch 1 connected to the battery negative electrode port BAT-, wherein the energy storage positive electrode port and the energy storage negative electrode port can be used to connect energy storage devices, such as energy storage components for connecting batteries and energy storage capacitors.

[0046] This embodiment sets up an energy storage branch, which can be connected to the power battery directly or through the positive power supply branch 2 and the negative power supply branch 1 to form an energy storage circuit, so that the power battery BAT can charge the energy storage component through the energy storage circuit to discharge energy and reduce the power and voltage of the power battery BAT. Figure 5 As an example, Figure 5 is Figure 1 On the basis of adding energy storage branch 5, Figure 5 In the embodiment, one end of the energy storage branch 5 is directly connected to the battery positive terminal BAT, and the other end is connected to the energy storage positive terminal. The energy storage negative terminal is connected to the battery negative terminal BAT through the power supply negative terminal branch 1. When the energy storage positive terminal and the energy storage negative terminal are connected to the energy storage device, if the controller 4 communicates with the power battery BAT and determines that the power level or voltage is too high, the controller 4 can control the power supply negative terminal branch 1 to be turned on and the energy storage relay RL3 to be closed, so that the power battery BAT charges the energy storage device connected to the energy storage positive terminal and the energy storage negative terminal to release the power energy of the power battery BAT. This can not only release the power energy of the power battery BAT to avoid the safety hazard caused by the power level or voltage of the power battery BAT being too high, but also store the power energy released by the power battery BAT in the energy storage device. Furthermore, when the power battery BAT needs to be charged, the controller 4 can also control the power supply negative terminal branch 1 to be turned on and the energy storage relay RL3 to be closed, so that the power battery BAT is charged through the energy storage device, thereby avoiding energy waste and improving the energy utilization efficiency of the power battery BAT.

[0047] Of course, in Figure 1-4 On the basis of, one end of the energy storage branch 5 can also be connected to the battery positive terminal BAT through the power supply positive branch 2, such as connected to terminal C. In this connection mode, when the power battery BAT is discharged through the energy storage branch 5, it is necessary to control the power supply positive branch 2 to be turned on. In addition, Figure 1-4On the basis of, the energy storage negative electrode port can also be directly connected to the battery negative electrode port BAT-, for example, the energy storage negative electrode port is directly connected to the terminal D. In this connection mode, when the power energy of the power battery BAT is discharged through the energy storage branch 5, it is not necessary to control the power supply negative electrode branch 1 to be turned on. Those skilled in the art can Figures 1-4 On the basis of setting the energy storage branch 5 and the connection mode of the energy storage negative electrode port to the battery positive electrode port BAT+ and the battery negative electrode port BAT-, this embodiment will not list them one by one.

[0048] In this embodiment, a power supply relay is provided in at least one of the positive power supply branch 2 and the negative power supply branch 1, and the control end of the power supply relay is connected to the controller 4 to Figure 6 As an example, Figure 6 is Figure 5 On the basis of only setting the main negative relay RL1 in the power supply negative branch 1, the control end of the main negative relay RL1 is connected to the controller 4. Of course, the main positive relay RL4 can also be set only in the power supply positive branch 2. Those skilled in the art can Figures 1-4 On the basis of, a main negative relay RL1 is set in the negative power supply branch 1, or a main positive relay RL4 is set in the positive power supply branch 2. Figure 7 As shown, in Figure 5 On the basis of the above, a main negative relay RL1 can also be set in the negative power supply branch 1, and a main positive relay RL4 can be set in the positive power supply branch 2. The control ends of the main negative relay RL1 and the main positive relay RL4 are both connected to the controller 4. When the power supply port needs to be powered on, the controller 4 controls the main negative relay RL1 and the main positive relay RL4 to be closed. Those skilled in the art can also Figures 1-4 On the basis of, a main negative relay RL1 is set in the negative power supply branch 1, and a main positive relay RL4 is set in the positive power supply branch 2.

[0049] In another optional embodiment, the power supply positive branch 2 may further include a pre-charge relay and a pre-charge resistor, the control end of the pre-charge relay is connected to the controller 4, the pre-charge resistor and the pre-charge relay RL5 are connected in series and then in parallel at both ends of the main positive relay RL4, such as Figure 8 The figure shows a schematic diagram of the positive power supply branch 2 including the pre-charge relay RL5 and the pre-charge resistor. When the power battery BAT powers on the power supply port, the main negative relay RL1 and the pre-charge relay RL5 are closed first, and the positive power supply port and the negative power supply port are pre-charged by current limiting through the pre-charge resistor. Then the controller 4 controls the pre-charge relay RL5 to disconnect and controls the main positive relay RL4 to close to formally power on the positive power supply port and the negative power supply port, so as to avoid damage to the relay contacts due to excessive current when directly powering on the positive power supply port and the negative power supply port.

[0050] In one embodiment, the power battery power supply circuit further includes a charging positive electrode port, a charging negative electrode port, a charging negative electrode branch, and a charging positive electrode branch. A charging relay is provided in at least one of the charging negative electrode branch and the charging positive electrode branch, and the control end of the charging relay is connected to the controller, wherein one end of the charging negative electrode branch is connected to the battery negative electrode port through the power supply negative electrode branch, and the other end is connected to the charging negative electrode port, and the charging positive electrode port is connected to the battery positive electrode port through the charging positive electrode branch.

[0051] like Figure 9 Shown is Figure 8 On the basis of the schematic diagram of adding the charging negative branch 6 and the charging positive branch 7, Figure 10 The charging negative branch 6 and the charging positive branch 7 are both provided with relays, that is, the charging negative branch 6 includes a charging negative relay RL6 and a charging fuse connected in series, and the charging positive branch 7 includes a charging positive relay RL7. Of course, it is also possible to set the charging negative relay RL6 and the charging fuse in series only in the charging negative branch 6, or to set the charging positive relay RL7 only in the charging positive branch 7. Figure 10 As shown, when the power battery BAT needs to be charged, the controller 4 controls the main negative relay RL1, the charging negative relay RL6 and the charging positive relay RL7 to close, so that the charging device connected to the charging positive port and the charging negative port charges the power battery BAT. The power battery power supply circuit can both supply power to the power battery BAT and charge the power battery BAT. The charging fuse can also limit the charging current to avoid damage to the power battery BAT caused by excessive charging current.

[0052] Of course, those skilled in the art can also Figure 1-Figure 7 On the basis of the above, a charging negative electrode branch 6 and a charging positive electrode branch 7 are added, and a charging relay is provided in at least one of the charging negative electrode branch 6 and the charging positive electrode branch 7.

[0053] like Figure 10 As shown, in another embodiment, the power battery power supply circuit further includes a main positive fuse 8, and the power supply positive branch 2 is connected to the battery positive port BAT+ through the main positive fuse 8. The main positive fuse 8 can prevent excessive current when powering the power supply positive port, the power supply negative port, the energy storage positive port, and the energy storage negative port, thereby ensuring the safety performance of the power supply of the power battery BAT.

[0054] like Figure 10As shown, the power battery power supply circuit also includes a current measurement module 9, which is arranged in the positive power supply branch 2 or the negative power supply branch 1. Exemplarily, the current measurement module can be a current sampling circuit or a Hall current sensor, etc. The current measurement module is connected to the controller 4 so that the controller 4 can control each relay according to the detected current value.

[0055] The present invention also provides a power battery system, which includes a power battery BAT and a power battery power supply circuit according to any embodiment of the present invention, wherein: Figure 1 As shown, the positive electrode of the power battery BAT is connected to the battery positive terminal BAT+ of the power battery power supply circuit, and the negative electrode of the power battery BAT is connected to the battery negative terminal BAT- of the power battery power supply circuit.

[0056] An embodiment of the present invention further provides an electric vehicle and a power battery system of the present invention for the electric vehicle, wherein the electric vehicle may be an electric car, an electric airplane, an electric ship, or the like.

[0057] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the purpose of clarifying the device. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0058] The technical principles of the present invention have been described above with reference to specific embodiments. These descriptions are intended solely to illustrate the principles of the present invention and should not be construed in any way as limiting the scope of protection of the present invention. Based on the explanations herein, those skilled in the art will be able to devise other specific implementations of the present invention without inventive effort, and such implementations will fall within the scope of protection of the present invention.

Claims

1. A power battery power supply circuit, characterized in that: It includes a battery negative electrode port, a battery positive electrode port, a power supply positive electrode port, a power supply negative electrode port, a power supply negative electrode branch, a power supply positive electrode branch, a discharge branch and a controller. The discharge branch includes a temperature detection module and a discharge relay and a discharge resistor connected in series. The negative electrode port of the battery is connected to the negative power supply port through the negative power supply branch, the positive electrode port of the battery is connected to the positive power supply port through the positive power supply branch, one end of the discharge branch is connected to the negative electrode port of the battery directly or through the negative power supply branch, and the other end of the discharge branch is connected to the positive electrode port of the battery directly or through the positive power supply branch; The temperature detection module is used to collect the temperature of the discharge resistor. The controller is connected to the temperature detection module and the control end of the discharge relay respectively. The controller is configured to be connected to the power battery.

2. The power battery power supply circuit according to claim 1, characterized in that: It also includes an energy storage positive electrode port, an energy storage negative electrode port and an energy storage branch, the energy storage branch includes an energy storage relay, the controller is connected to the control end of the energy storage relay, one end of the energy storage branch is connected to the battery positive electrode port directly or through the power supply positive electrode branch, the other end of the energy storage branch is connected to the energy storage positive electrode port, and the energy storage negative electrode port is connected to the battery negative electrode port directly or through the power supply negative electrode branch.

3. The power battery power supply circuit according to claim 1, characterized in that: A power supply relay is provided in at least one of the positive power supply branch and the negative power supply branch, and a control end of the power supply relay is connected to the controller.

4. The power battery power supply circuit according to claim 3, characterized in that: The power supply relay includes a main positive relay arranged in the power supply positive branch, and the power supply positive branch also includes a pre-charging resistor and a pre-charging relay. The control end of the pre-charging relay is connected to the controller, and the pre-charging resistor and the pre-charging relay are connected in series and then in parallel at both ends of the main positive relay.

5. The power battery power supply circuit according to claim 1, characterized in that: It also includes a positive charging port, a negative charging port, a negative charging branch, and a positive charging branch, wherein at least one of the negative charging branch and the positive charging branch is provided with a charging relay, and a control end of the charging relay is connected to the controller; One end of the charging negative electrode branch is connected to the battery negative electrode port through the power supply negative electrode branch, and the other end is connected to the charging negative electrode port. The charging positive electrode port is connected to the battery positive electrode port through the charging positive electrode branch.

6. The power battery power supply circuit according to claim 5, characterized in that: A charging fuse is provided in the charging negative electrode branch.

7. The power battery power supply circuit according to any one of claims 1 to 6, characterized in that: It also includes a main positive fuse, and the power supply positive branch is connected to the battery positive port through the main positive fuse.

8. The power battery power supply circuit according to any one of claims 1 to 6, characterized in that: It also includes a current measurement module, which is arranged in the positive power supply branch or the negative power supply branch.

9. A power battery system, characterized in that: It comprises a power battery and the power battery power supply circuit according to any one of claims 1 to 8, wherein the positive electrode of the power battery is connected to the battery positive terminal of the power battery power supply circuit, and the negative electrode of the power battery is connected to the battery negative terminal of the power battery power supply circuit.

10. An electric vehicle, characterized in that: The electric vehicle comprises the power battery system according to claim 9.

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