Battery pack, vehicle and control method

Abstract

The invention provides a battery pack, a vehicle and a control method. The battery pack comprises a battery, a power supply module, a BMS circuit, a first conductive branch and a second conductive branch, the power supply module is used for converting the output voltage of the battery to supply power to the BMS circuit, and the second conductive branch comprises a current detection part; the first conductive branch is connected to a first pole end of the battery, the second conductive branch is connected to a second pole end of the battery, and the current detection piece is connected in series with the second pole end; the power module is connected to the first conductive branch, and the battery, the first conductive branch, the power module and the second conductive branch form a power supply loop. According to the battery pack, the charging and discharging current of the battery and the working current of the BMS circuit are detected at the same time, accurate statistics of the current flowing through the battery is achieved, omission of the working current of the BMS circuit is avoided, current detection deviation is prevented, and then the accuracy of calculating the SOC of the battery according to the detection data of the current detection piece can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of battery SOC detection, and in particular to a battery pack, a vehicle, and a control method. Background Art

[0002] Most new energy vehicles are equipped with a 12V battery to power vehicle loads. During use, the battery current is typically detected to calculate the battery's state of charge (SOC).

[0003] In the related art, deviations are likely to occur when detecting the battery current, thereby affecting the accuracy of calculating the battery's SOC value. Summary of the Invention

[0004] The embodiments of the present application provide a battery pack, a vehicle, and a control method, which can improve the technical problem that deviations are likely to occur when detecting the battery current, thereby affecting the accuracy of calculating the battery's SOC value.

[0005] In a first aspect, an embodiment of the present application provides a battery pack, comprising a battery, a power module, a BMS circuit, a first conductive branch, and a second conductive branch, wherein the power module is configured to convert an output voltage of the battery to power the BMS circuit, and the second conductive branch includes a current detection element;

[0006] The first conductive branch is connected to the first terminal of the battery, the second conductive branch is connected to the second terminal of the battery, and the current detection element and the second terminal are connected in series;

[0007] The power module is connected to the first conductive branch, and the battery, the first conductive branch, the power module and the second conductive branch form a power supply circuit.

[0008] In one embodiment, the battery pack further includes a third conductive branch electrically connected to the second conductive branch, the first conductive branch and the third conductive branch can be connected to an external power supply, and the external power supply, the first conductive branch, the power module and the third conductive branch are electrically connected in sequence so that the power module can convert the output voltage of the external power supply and supply power to the BMS circuit.

[0009] In one embodiment, the first terminal of the battery is electrically connected to the first conductive branch, the second terminal of the battery, the second conductive branch, and the third conductive branch are electrically connected in sequence, the input terminal of the power module is connected to the first conductive branch, and the output terminal of the power module is connected between the second conductive branch and the third conductive branch.

[0010] In one embodiment, the battery pack further includes a switching module, which is connected between the first conductive branch and the power module. The switching module can switch between a first state and a second state, wherein in the first state, the switching module connects the battery and the power module, and disconnects the external power supply and the power module; in the second state, the switching module disconnects the battery and the power module, and connects the external power supply and the power module.

[0011] In one embodiment, when the voltage of the external power source is greater than the voltage of the battery, the on-off module is in the second state.

[0012] In one embodiment, the battery pack further includes at least two diodes, the at least two diodes including a first diode and a second diode, the first terminal of the battery, the positive terminal of the first diode, the negative terminal of the first diode and the input terminal of the power module are connected in sequence, and the external power supply, the positive terminal of the second diode, the negative terminal of the second diode and the input terminal of the power module are connected in sequence.

[0013] In one embodiment, the first conductive branch includes a switching element, and the battery pack further includes an overcurrent protection module, which is connected to the switching element. The overcurrent protection module is used to detect the voltage of the current detection component, and the overcurrent protection module is configured to control the on and off of the switching element based on the voltage of the current detection component.

[0014] In one embodiment, the overcurrent protection module includes a comparator and a driver, and the current detection element, the comparator, the driver and the switching element are connected in sequence. The comparator is configured to: when the voltage of the current detection element is greater than a threshold, send a control signal to the driver so that the driver drives the switching element to disconnect.

[0015] In one embodiment, the current detection component includes a shunt and an analog front end, the analog front end is connected to the shunt, and the power ground of the analog front end and the output negative electrode of the power module are both connected to the first conductive branch.

[0016] In a second aspect, an embodiment of the present application provides a vehicle comprising the above-mentioned battery pack.

[0017] In a third aspect, an embodiment of the present application provides a battery pack control method, including:

[0018] determining the actual power consumption of the BMS circuit based on the detection data of the current detection element;

[0019] Based on the actual power consumption of the BMS circuit, it is determined whether the BMS circuit is in an abnormal state.

[0020] Beneficial effects of the embodiments of the present application:

[0021] In an embodiment of the present application, a battery, a first conductive branch, a power module, and a second conductive branch are electrically connected in sequence to form a power supply circuit, so that the power module can convert the battery voltage and supply power to the BMS circuit to ensure that the BMS circuit can operate normally. The second conductive branch includes a current detection element, and the current detection element can detect the current of the power supply circuit, that is, the current detection element can detect the internal loop current to detect the operating current of the BMS circuit. The battery is connected to an external device through the first conductive branch and the second conductive branch, so that the power supply can discharge or charge through the first conductive branch and the second conductive branch. The second conductive branch includes a current detection element, and the current detection element can also detect the external loop current, that is, the current detection element can detect the charge and discharge current of the power supply. That is to say, the present application sets the current detection element on the second conductive branch so that the current detection element can detect the internal loop current and the external loop current at the same time, that is, the current detection element can simultaneously detect the battery charging and discharging current and the working current of the BMS circuit, and realize accurate statistics of the current flowing through the battery, avoid missing the working current of the BMS circuit, and prevent current detection deviation, thereby improving the accuracy of the battery SOC calculated based on the detection data of the current detection element, and ensuring that the power consumption influence of the BMS module will not be omitted when calculating the SOC value of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 This is one of the structural diagrams of a battery pack in the related art;

[0024] Figure 2 This is the second structural diagram of the battery pack provided in the embodiment of the present application;

[0025] Figure 3 is a schematic diagram of the structure of a battery pack provided in an embodiment of the present application, wherein the dotted line in the figure represents the internal power supply circuit when the battery supplies power to the power module;

[0026] Figure 4is a schematic diagram of the structure of a battery pack provided in an embodiment of the present application, wherein the dotted line in the figure represents an external power supply circuit when an external power supply supplies power to the power module;

[0027] Figure 5 This is a flow chart of a battery pack control method provided in an embodiment of the present application. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present application. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, unless otherwise specified, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; and "inside" and "outside" refer to the outline of the device.

[0029] The following combination Figures 1 to 5 Describe the battery pack, vehicle and control method of the present application.

[0030] According to the embodiment of the first aspect of the present application, see Figure 1 The battery pack includes a battery 1, a power module 2, a BMS circuit, a first conductive branch 4, and a second conductive branch 5. The power module 2 is used to convert the output voltage of the battery 1 to power the BMS circuit. The second conductive branch 5 includes a current detection element 51.

[0031] The first conductive branch 4 is connected to the first terminal of the battery 1, the second conductive branch 5 is connected to the second terminal of the battery 1, and the current detection element 51 is connected in series with the second terminal;

[0032] The power module 2 is connected to the first conductive branch 4 , and the battery 1 , the first conductive branch 4 , the power module 2 and the second conductive branch 5 form a power supply circuit.

[0033] According to the battery pack of the embodiment of the present application, the battery 1, the first conductive branch 4, the power module 2 and the second conductive branch 5 are electrically connected in sequence to form a power supply circuit, so that the power module 2 can convert the voltage of the battery 1 and supply power to the BMS circuit to ensure that the BMS circuit can operate normally, and the second conductive branch 5 includes a current detection element 51, and the current detection element 51 can detect the current of the power supply circuit, that is, the current detection element 51 can detect the internal loop current to detect the working current of the BMS circuit. The battery 1 is connected to an external device through the first conductive branch 4 and the second conductive branch 5, so that the power supply can discharge or charge through the first conductive branch 4 and the second conductive branch 5, and the second conductive branch 5 includes a current detection element 51, and the current detection element 51 can also detect the external loop current, that is, the current detection element 51 can detect the charging and discharging current of the power supply. That is to say, the present application sets the current detection element 51 on the second conductive branch 5 so that the current detection element 51 can detect the internal loop current and the external loop current at the same time, that is, the current detection element 51 can simultaneously detect the charging and discharging current of the battery 1 and the working current of the BMS circuit, thereby achieving accurate statistics of the current flowing through the battery 1, avoiding missing the working current of the BMS circuit, and preventing current detection deviation, thereby improving the accuracy of the SOC of the battery 1 calculated based on the detection data of the current detection element 51, and ensuring that the power consumption influence of the BMS module is not omitted when calculating the SOC value of the battery 1.

[0034] It is understandable that in the related art, the battery management system BMS of the 12V lithium battery 1 usually uses AFE to collect current in order to save costs and improve the accuracy of current collection. However, the current collected by the AFE chip does not include the power consumption of the BMS module 2 itself, and the power source of the BMS is usually the battery 11. Since the collected current value lacks board power consumption, the Ah integral calculation is too small and the SOC is too small. In this application, the current detection element 51 is set on both the internal conductive circuit and the external conductive circuit, so that the current detection element 51 can simultaneously detect the charge and discharge current of the battery 1 and the operating current of the BMS circuit, which is conducive to improving the SOC value of the battery 1 calculated based on the detection data of the current detection element 51.

[0035] For example, when the first conductive branch 4 and the second conductive branch 5 are connected to an external load, the battery 1 can supply power to the external load through the first conductive branch 4 and the second conductive branch 5. When the first conductive branch 4 and the second conductive branch 5 are connected to an external power source, the external power source can supply power to the power module 2 through the first conductive branch 4 and the second conductive branch 5.

[0036] In some embodiments, see Figure 1 and Figure 3The battery pack also includes a third conductive branch 6 electrically connected to the second conductive branch 5. The first conductive branch 4 and the third conductive branch 6 can be connected to an external power supply. The external power supply, the first conductive branch 4, the power module 2 and the third conductive branch 6 are electrically connected in sequence, so that the power module 2 can convert the output voltage of the external power supply and power the BMS circuit.

[0037] It can be understood that the first conductive branch 4, the power module 2 and the third conductive branch 6 are electrically connected in sequence. When the first conductive branch 4 and the third conductive branch 6 are connected to the external power supply, the external power supply, the first conductive branch 4, the power module 2 and the third conductive branch 6 form an external power supply circuit. The external power supply can power the power module 2, and the power module 2 converts the output voltage of the external power supply and powers the BMS circuit, thereby realizing the use of the external power supply to power the BMS circuit.

[0038] It is understandable that when an external power source is used for power supply, the current detection element 51 is not on the third conductive branch 6 , which can avoid misdetection by the current detection element 51 .

[0039] In some embodiments, see Figure 1 、 Figure 3 and Figure 4 The first end of the battery 1 is electrically connected to the first conductive branch 4, the second end of the battery 1, the second conductive branch 5 and the third conductive branch 6 are electrically connected in sequence, the input end of the power module 2 is connected to the first conductive branch 4, and the output end of the power module 2 is connected between the second conductive branch 5 and the third conductive branch 6.

[0040] It is understood that by connecting the output end of the power module 2 between the second conductive branch 5 and the third conductive branch 6, when the battery 1 is used for power supply, the first terminal of the battery 1, the power module 2, the current detection element 51, and the second terminal of the battery 1 form an internal loop, ensuring that the current detection element 51 can detect the current in the internal loop and detect the operating current of the BMS circuit. When the power module 2 is powered by an external power supply, the external power supply, the first conductive branch 4, the power module 2, and the third conductive branch 6 form an external power supply loop. At this time, the current detection element 51 is not in the external power supply loop and will not detect the operating current of the BMS circuit when powered by the external power supply, thus ensuring the accuracy of the current detection of the battery 1.

[0041] It can be understood that this embodiment ensures, through circuit connection design, that when the battery 1 is used to power the power module 2, the operating current of the BMS circuit will definitely pass through the current detection component 51, and when an external power supply is used to power the power module 2, the operating current of the BMS circuit will definitely not pass through the current detection component 51.

[0042] In some embodiments, see Figure 2 The battery pack also includes a switching module 7, which is connected between the first conductive branch 4 and the power module 2. The switching module 7 can switch between a first state and a second state. In the first state, the switching module 7 connects the battery 1 and the power module 2, and the switching module 7 disconnects the external power supply and the power module 2. In the second state, the switching module 7 disconnects the battery 1 and the power module 2, and the switching module 7 connects the external power supply and the power module 2.

[0043] It is understood that when the battery 1 is used to power the power module 2, the on / off module 7 is controlled to be in a first state, so that the battery 1 and the power module 2 are connected, and the external power source and the power module 2 are disconnected. This allows the battery 1, the power module 2, and the current detection element 51 to form a conductive loop, thereby enabling the battery 1 to power the power module 2. When the external power source is used to power the power module 2, the on / off module 7 is controlled to be in a second state, so that the battery 1 and the power module 2 are disconnected, and the external power source and the power module 2 are connected. The external power source, the first conductive branch 4, the power module 2, and the third conductive branch 6 form a conductive loop, thereby enabling the external power source to power the power module 2. In other words, by controlling the state of the on / off module 7, switching between internal and external power supply can be achieved, so that the power module 2 is connected to only one of the battery 1 and the external power source at a time, thereby ensuring power supply stability.

[0044] In some examples, the on / off module 7 is, for example, a relay component or a MOS tube component.

[0045] Specifically, when the voltage of the external power supply is greater than the voltage of the battery 1 , the on-off module 7 is in the second state.

[0046] It can be understood that when the voltage of the external power supply is greater than the voltage of the battery 1, the external power supply is used to power the power module 2 first, so that the on-off module 7 is in the second state, so that the power module 2 is disconnected from the battery 1, and the power module 2 is connected to the external power supply, so that the external power supply can power the power module 2.

[0047] In some examples, the state switching of the on-off module 7 may be controlled by a BMS circuit, or a separate control module may be provided to control the state switching of the on-off module 7 .

[0048] In some embodiments, see Figure 1 The battery pack also includes at least two diodes, including a first diode D1 and a second diode D2. The first terminal of the battery 1, the positive terminal of the first diode D1, the negative terminal of the first diode D1 and the input terminal of the power module 2 are connected in sequence, and the external power supply, the positive terminal of the second diode D2, the negative terminal of the second diode D2 and the input terminal of the power module 2 are connected in sequence.

[0049] It can be understood that, by setting the first diode D1, the first extreme end of the battery 1 is unidirectionally conducted to the power module 2, and by setting the second diode D2, the external power supply is unidirectionally conducted to the power module 2, thereby ensuring the stability of power supply.

[0050] In some examples, the first conductive branch 4 includes a circuit breaker, and the anode terminal of the first diode D1 and the anode terminal of the second diode D2 are connected to two ends of the circuit breaker.

[0051] In some embodiments, see Figure 1 The first conductive branch 4 includes a switching element 7, and the battery pack also includes an overcurrent protection module 8. The overcurrent protection module 8 is connected to the switching element 7. The overcurrent protection module 8 is used to detect the voltage of the current detection component 51. The overcurrent protection module 8 is configured to control the on and off of the switching element 7 based on the voltage of the current detection component 51.

[0052] It is understood that the battery 1 can be connected to an external device via the first conductive branch 4 and the second conductive branch 5. When the voltage of the current detection element 51 is greater than a threshold, indicating that the current in the external circuit is too high, the overcurrent protection module 8 controls the switch element 7 to disconnect, thereby disconnecting the first conductive branch 4 and preventing damage to components. In other words, the switching element 7 can be controlled to be on and off based on the voltage passing through the current detection element 51. When the current in the second conductive branch 5 is not too high, that is, the voltage of the current detection element 51 is not too high, the switch element 7 is controlled to be closed. When the current in the second conductive branch 5 is too high, that is, the voltage of the current detection element 51 is too high, the switch element 7 is controlled to be disconnected to protect the circuit.

[0053] In some examples, when an external device short-circuits, the connection between the external device and the first conductive branch 4 and the second conductive branch 5 may cause excessive current flow through the first conductive branch 4, the battery 1, and the second conductive branch 5, causing the voltage of the current detection element 51 on the second conductive branch 5 to exceed a threshold. (The overcurrent protection module 8 detects the voltage at the current detection element 51 and, when it exceeds a preset value, controls the switch element 7 to disconnect.)

[0054] In some examples, the switching element 7 is, for example, a circuit breaker or a relay.

[0055] Specifically, the overcurrent protection module 8 includes a comparator 81 and a driver 82. The current detection element 51, the comparator 81, the driver 82 and the switching element 7 are connected in sequence. The comparator 81 is configured to: when the voltage of the current detection element 51 is greater than the threshold, send a control signal to the driver 82 so that the driver 82 drives the switching element 7 to disconnect.

[0056] It can be understood that when the voltage at the current detection element 51 is greater than the threshold value, it means that the current at the second conductive branch 5 is too large. At this time, the comparator 81 will send a control signal to the driver 82, and the driver 82 will drive the switching element 7 to switch to the off state to disconnect the circuit and protect the circuit.

[0057] For example, see Figure 1 To prevent damage to the AFE caused by excessive current, the hardware overcurrent protection module is used. When the current exceeds 1000A, that is, when the voltage on the Shunt exceeds 0.1V, the hardware protection is activated. The comparator controls the GateDriver circuit to shut down the power supply to the CB, thus shutting down the CB. This protects the AFE and the battery cell.

[0058] The Shunt negative of AFE is connected to KL30.

[0059] In some embodiments, see Figure 1 The current detection component 51 includes a shunt 511 and an analog front end 512 . The analog front end 512 is connected to the shunt 511 . The power ground of the analog front end 512 and the output negative electrode of the power module 2 are both connected to the first conductive branch 4 .

[0060] It is understandable that connecting the power ground of the analog front end 512 and the output negative electrode of the power module 2 at the same position is beneficial to improving the accuracy of the collected data of the analog front end 512.

[0061] According to an embodiment of the second aspect of the present application, a vehicle includes the above-mentioned battery pack.

[0062] According to the vehicle of the embodiment of the present application, the battery 1, the power module 2, and the second conductive branch 5 are electrically connected in sequence to form a power supply circuit, so that the power module 2 can convert the voltage of the battery 1 and supply power to the BMS circuit to ensure that the BMS circuit can operate normally. The second conductive branch 5 includes a current detection element 51, and the current detection element 51 can detect the current of the power supply circuit, that is, the current detection element 51 can detect the internal loop current to detect the operating current of the BMS circuit. The battery 1 is connected to an external device through the first conductive branch 4 and the second conductive branch 5, so that the power supply can discharge or charge through the first conductive branch 4 and the second conductive branch 5. The second conductive branch 5 includes a current detection element 51, and the current detection element 51 can also detect the external loop current, that is, the current detection element 51 can detect the charging and discharging current of the power supply. That is to say, the present application sets the current detection element 51 on the second conductive branch 5 so that the current detection element 51 can detect the internal loop current and the external loop current at the same time, that is, the current detection element 51 can simultaneously detect the charging and discharging current of the battery 1 and the working current of the BMS circuit, thereby achieving accurate statistics of the current flowing through the battery 1, avoiding missing the working current of the BMS circuit, and preventing current detection deviation, thereby improving the accuracy of the SOC of the battery 1 calculated based on the detection data of the current detection element 51, and ensuring that the power consumption influence of the BMS module is not omitted when calculating the SOC value of the battery 1.

[0063] In some examples, the vehicle may be a fuel vehicle, a plug-in hybrid vehicle, or a new energy vehicle, etc., which is not specifically limited in this application.

[0064] According to the embodiment of the third aspect of the present application, see Figure 5 , a battery pack control method, comprising:

[0065] Step 101: Determine the actual power consumption of the BMS circuit based on the detection data of the current detection element 51;

[0066] Step 102: Based on the actual power consumption of the BMS circuit, determine whether the BMS circuit is in an abnormal state.

[0067] According to the battery pack control method of the present application, since the current detection component 51 can detect the operating current of the BMS circuit, the actual power consumption of the BMS circuit can be determined based on the detection data of the current detection component 51. By comparing the actual power consumption of the BMS circuit with the standard value, it can be determined whether the power consumption of the BMS circuit is abnormal, and further it can be determined whether the BMS circuit is in an abnormal state.

[0068] For example, when there is a GateDriver driving abnormality in the BMS circuit, the board power consumption value will be abnormal.

[0069] In some examples, the first conductive branch 4 and the second conductive branch 5 are not connected to an external device, that is, the battery 1 does not power the external device. At this time, the battery 1 only powers the BMS circuit. Therefore, the detection data of the current detection element 51 can directly reflect the operating current of the BMS circuit.

[0070] In some examples, when the first conductive branch 4 and the second conductive branch 5 are connected to an external device, that is, when the battery 1 not only powers the BMS circuit but also powers the external device, the current detection element 51 simultaneously detects the internal loop current and the external loop current. The external loop current can be determined based on the operating mode of the battery pack or the power demand of the external device. Furthermore, the internal loop current can be determined based on the detection data of the current detection element 51, and thus the operating current of the BMS circuit can be determined. For example, a mapping table between the operating mode of the battery pack or the power demand of the external device and the external loop current can be pre-established, and the magnitude of the external loop current can then be directly determined based on the operating mode of the battery pack or the power demand of the external device.

[0071] The above is a detailed introduction to the embodiments of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. At the same time, for those skilled in the art, based on the ideas of the present application, there may be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A battery pack, characterized in that: It includes a battery, a power module, a BMS circuit, a first conductive branch, and a second conductive branch, wherein the power module is used to convert the output voltage of the battery to power the BMS circuit, and the second conductive branch includes a current detection element; The first conductive branch is connected to the first terminal of the battery, the second conductive branch is connected to the second terminal of the battery, and the current detection element and the second terminal are connected in series; The power module is connected to the first conductive branch, and the battery, the first conductive branch, the power module and the second conductive branch form a power supply circuit.

2. The battery pack according to claim 1, wherein: The battery pack also includes a third conductive branch electrically connected to the second conductive branch. The first conductive branch and the third conductive branch can be connected to an external power supply. The external power supply, the first conductive branch, the power module and the third conductive branch are electrically connected in sequence so that the power module can convert the output voltage of the external power supply and supply power to the BMS circuit.

3. The battery pack according to claim 2, wherein: The first terminal of the battery is electrically connected to the first conductive branch, the second terminal of the battery, the second conductive branch, and the third conductive branch are electrically connected in sequence, the input end of the power module is connected to the first conductive branch, and the output end of the power module is connected between the second conductive branch and the third conductive branch.

4. The battery pack according to claim 2, wherein: The battery pack also includes a switching module, which is connected between the first conductive branch and the power module. The switching module can switch between a first state and a second state. In the first state, the switching module connects the battery and the power module, and disconnects the external power supply and the power module. In the second state, the switching module disconnects the battery and the power module, and connects the external power supply and the power module.

5. The battery pack according to claim 4, characterized in that: When the voltage of the external power supply is greater than the voltage of the battery, the on-off module is in the second state.

6. The battery pack according to claim 2, characterized in that: The battery pack also includes at least two diodes, which include a first diode and a second diode. The first terminal of the battery, the positive terminal of the first diode, the negative terminal of the first diode and the input terminal of the power module are connected in sequence, and the external power supply, the positive terminal of the second diode, the negative terminal of the second diode and the input terminal of the power module are connected in sequence.

7. The battery pack according to any one of claims 1 to 6, characterized in that: The first conductive branch includes a switching element, and the battery pack also includes an overcurrent protection module, which is connected to the switching element. The overcurrent protection module is used to detect the voltage of the current detection component, and the overcurrent protection module is configured to control the on and off of the switching element based on the voltage of the current detection component.

8. The battery pack according to claim 7, characterized in that: The overcurrent protection module includes a comparator and a driver. The current detection component, the comparator, the driver and the switching element are connected in sequence. The comparator is configured to: when the voltage of the current detection component is greater than a threshold, send a control signal to the driver so that the driver drives the switching element to disconnect.

9. The battery pack according to any one of claims 1 to 6, characterized in that: The current detection component includes a shunt and an analog front end, the analog front end is connected to the shunt, and the power ground of the analog front end and the output negative electrode of the power module are both connected to the first conductive branch.

10. A vehicle, characterized in that: Comprising the battery pack according to any one of claims 1 to 9.

11. A battery pack control method based on the battery pack according to any one of claims 1 to 9, characterized in that: include: determining the actual power consumption of the BMS circuit based on the detection data of the current detection element; Based on the actual power consumption of the BMS circuit, it is determined whether the BMS circuit is in an abnormal state.

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