A battery protection circuit, a battery pack, and a battery compartment

Abstract

This application provides a battery protection circuit, a battery pack, and a battery compartment. The battery protection circuit includes a switching sub-circuit, a first resistor, and a detection sub-circuit. The control terminal of the switching sub-circuit is connected to the presence detection terminal of the battery pack. The first terminal of the switching sub-circuit and the first terminal of the first resistor are respectively connected to the temperature detection resistor connection terminal of the battery management system in the battery pack. The second terminal of the switching sub-circuit and the second terminal of the first resistor are respectively connected to the first terminal of the detection sub-circuit. The switching sub-circuit switches between on and off based on the level signal of the presence detection terminal. This application can prevent arcing when the battery pack is connected to a load.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery protection circuit, a battery pack, and a battery compartment. Background Technology

[0002] In current battery products, under normal circumstances, the discharge MOSFET will be turned on by default to control the normal output of the battery. In this case, if a load is directly plugged in, arcing will occur.

[0003] To address the above situation, related technologies typically involve adding an MCU and / or a pre-discharge circuit, which increases the circuit cost.

[0004] Furthermore, adding an MCU requires continuous operation, increasing standby power consumption and shortening battery life. Adding a pre-discharge circuit presents challenges in controlling its on / off state for optimal performance. Simultaneously adding both an MCU and a pre-discharge circuit increases hardware costs (MCU power supply, MCU control unit, pre-discharge circuit unit) and software costs (software development, programming, and testing), leading to higher component and labor costs. Utility Model Content

[0005] In view of this, the purpose of this utility model is to provide a battery protection circuit, a battery pack, and a battery compartment to overcome at least one of the above-mentioned defects.

[0006] This application provides a battery protection circuit, which includes a switching sub-circuit, a first resistor, and a detection sub-circuit.

[0007] Wherein, the first end of the first resistor is connected to the temperature sensing resistor connection terminal, the second end of the first resistor is connected to the detection sub-circuit, the first terminal of the switch sub-circuit is connected to the first end of the first resistor, the second terminal of the switch sub-circuit is connected to the second end of the first resistor, and the control terminal of the switch sub-circuit is connected to the in-situ detection terminal.

[0008] Specifically, when the in-situ detection terminal provides a first level signal, the switch sub-circuit closes to disconnect the first resistor; when the in-situ detection terminal provides a second level signal, the switch sub-circuit opens to connect the first resistor.

[0009] Furthermore, the temperature sensing resistor connection terminal includes a discharge high temperature sensing resistor connection terminal for the battery management system of the battery pack.

[0010] The battery protection circuit further includes a second resistor, which is disposed between the discharge high temperature detection resistor connection terminal and the first end of the first resistor.

[0011] Furthermore, the battery protection circuit also includes a third resistor, a fourth resistor, and a fifth resistor.

[0012] Wherein, the first end of the third resistor is connected to the charging high temperature detection resistor connection terminal of the battery management system, and the second end of the third resistor is connected to the second end of the first resistor;

[0013] The first end of the fourth resistor is connected to the charge / discharge low-temperature detection resistor connection terminal of the battery management system, the second end of the fourth resistor is connected to the first end of the fifth resistor, and the second end of the fifth resistor is connected to the second end of the first resistor.

[0014] Furthermore, the temperature sensing resistor connection terminal includes a charge / discharge low-temperature sensing resistor connection terminal for the battery management system of the battery pack.

[0015] The battery protection circuit further includes a sixth resistor and a seventh resistor, which are connected in series and disposed between the charging and discharging low temperature detection resistor connection terminal and the first end of the first resistor.

[0016] Furthermore, the battery protection circuit also includes an eighth resistor and a ninth resistor.

[0017] The eighth resistor is disposed between the discharge high temperature detection resistor connection terminal of the battery management system and the second end of the first resistor, and the ninth resistor is disposed between the charging high temperature detection resistor connection terminal of the battery management system and the second end of the first resistor.

[0018] Furthermore, the detection sub-circuit includes a thermistor.

[0019] Wherein, the first end of the thermistor is connected to the second end of the first resistor, and the second end of the thermistor is grounded;

[0020] And / or, the switching sub-circuit includes a transistor.

[0021] Furthermore, the battery protection circuit also includes a filter sub-circuit.

[0022] The first end of the filter sub-circuit is connected to the first node, the second end of the filter sub-circuit is grounded, and the first node is between the control terminal of the switch sub-circuit and the in-situ detection terminal.

[0023] Furthermore, the battery protection circuit also includes a current-limiting resistor and a diode.

[0024] Wherein, one end of the diode is connected to the second node, and the other end of the diode is grounded, and the second node is between the control terminal of the switch sub-circuit and the first node;

[0025] The current-limiting resistor is disposed between the first node and the in-situ detection terminal.

[0026] Furthermore, the switch sub-circuit, the first resistor, the detection sub-circuit, the battery management system, and the battery cell are packaged into a battery pack, and the in-situ detection terminal is led out and disposed outside the package.

[0027] This application embodiment also provides a battery pack, which includes a battery cell, a battery management system, and the aforementioned battery protection circuit. The first end of the first resistor in the battery protection circuit is connected to the temperature detection resistor connection terminal of the battery management system.

[0028] Furthermore, the battery pack also includes:

[0029] A discharge switch is installed on a preset power transmission line, which is one of the positive power transmission line and the negative power transmission line of the battery pack.

[0030] The battery management system is configured to control the discharge switch to open based on the voltage value of the temperature sensing resistor connection terminal when the switch sub-circuit is open, so that there is no output on the positive power transmission line and the negative power transmission line of the battery pack.

[0031] This application embodiment also provides a battery compartment, the battery compartment comprising:

[0032] In-place contacts are used to connect to the temperature sensing resistor connection terminals of the battery protection circuit described above.

[0033] A voltage supply circuit is connected to the in-situ contact, the voltage supply circuit being configured to provide a first level signal to the in-situ contact when the in-situ contact is connected to the temperature sensing resistor connection terminal.

[0034] Furthermore, the battery compartment also includes positive wiring contacts and negative wiring contacts;

[0035] The voltage supply circuit includes wires to connect the positive connection contact to the in-situ contact.

[0036] The battery protection circuit, battery pack, and battery compartment provided in this application embodiment, compared with the existing technology of adding an MCU and / or adding a pre-discharge circuit, avoids the arcing phenomenon that occurs when the battery pack is directly plugged into the load in the form of a pure hardware circuit.

[0037] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0038] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 This is one of the structural schematic diagrams of a battery protection circuit provided in the embodiments of this application;

[0040] Figure 2 This is a second schematic diagram of a battery protection circuit provided in an embodiment of this application;

[0041] Figure 3 This is a schematic diagram of the structure of a battery pack provided in an embodiment of this application;

[0042] Figure 4 This is a schematic diagram of the structure of a battery pack and battery compartment provided in an embodiment of this application.

[0043] Icons: 10: Battery protection circuit; 110: Switch sub-circuit; R1: First resistor; 120: Detection sub-circuit; RT: Temperature detection resistor connection terminal; PK: In-situ detection terminal; D: First terminal; S: Second terminal; G: Control terminal; BMS: Battery Management System; RDOT: Discharge high temperature detection resistor connection terminal; RCOT: Charging high temperature detection resistor connection terminal; RUT: Charging / discharging low temperature detection resistor connection terminal; R2: Second resistor; R3: Third resistor; R4: Fourth resistor; R5 R6: Fifth resistor; R7: Sixth resistor; R8: Seventh resistor; R9: Ninth resistor; NTC: Thermistor; Q1: Transistor; RC: Filter circuit; 1: First node; 2: Second node; RK: Current limiting resistor; D1: Diode; 20: Battery pack; B1: Battery cell; K1: Discharge switch; V1+: Positive power supply line; V1-: Negative power supply line; 30: Battery compartment; K2: In-place contact; V2: Voltage supply circuit; P+: Positive connection contact; P-: Negative connection contact. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. Based on the embodiments of this application, every other embodiment obtained by those skilled in the art without inventive effort falls within the scope of protection of this application.

[0045] Research has revealed that in current battery products, under normal conditions, the discharge MOSFET will be turned on by default to control the normal output of the battery. In this case, if a load is directly plugged in, arcing will occur.

[0046] To address the above situation, related technologies typically involve adding an MCU and / or a pre-discharge circuit, which increases the circuit cost.

[0047] Furthermore, adding an MCU requires continuous operation, increasing standby power consumption and shortening battery life. Adding a pre-discharge circuit presents challenges in controlling its on / off state for optimal performance. Simultaneously adding both an MCU and a pre-discharge circuit increases hardware costs (MCU power supply, MCU control unit, pre-discharge circuit unit) and software costs (software development, programming, and testing), leading to higher component and labor costs.

[0048] Based on this, this application provides a battery protection circuit that, in the form of a purely hardware circuit, avoids arcing that can occur when a battery pack is directly plugged into a load.

[0049] Please see Figure 1 , Figure 1 This is one of the structural schematic diagrams of a battery protection circuit provided in an embodiment of this application. Figure 1 As shown in the figure, the battery protection circuit 10 provided in this application embodiment includes a switch sub-circuit 110, a first resistor R1, and a detection sub-circuit 120.

[0050] Wherein, the first end of the first resistor R1 is connected to the temperature detection resistor connection terminal RT, the second end of the first resistor R1 is connected to the detection sub-circuit 120, the first terminal D of the switch sub-circuit 110 is connected to the first end of the first resistor R1, the second terminal S of the switch sub-circuit 110 is connected to the second end of the first resistor R1, and the control terminal of the switch sub-circuit 110 is connected to the in-situ detection terminal PK.

[0051] Specifically, when the in-situ detection terminal PK provides a first level signal, the switch sub-circuit 110 is closed to disconnect the first resistor R1; when the in-situ detection terminal PK provides a second level signal, the switch sub-circuit 110 is opened to connect the first resistor R1.

[0052] In one possible implementation of this application, the first resistor R1 can be selected as a resistor with a resistance of 1MΩ.

[0053] Here, depending on the type of the switch sub-circuit 110, it is determined whether the switch sub-circuit 110 is closed with a high-level signal or a low-level signal. When it is determined that the switch sub-circuit 110 is closed with a high-level signal, the first level signal is a high-level signal and the second level signal is a low-level signal; when it is determined that the switch sub-circuit 110 is closed with a low-level signal, the first level signal is a low-level signal and the second level signal is a high-level signal.

[0054] For example, when the presence detection terminal PK provides a first level signal, the switch sub-circuit 110 is closed to bypass the first resistor R1. At this time, the battery management system can detect the cell temperature based on the voltage value in the detection sub-circuit 120 in the loop. When the presence detection terminal PK provides a second level signal, the switch sub-circuit 110 is opened to connect the first resistor R1. At this time, the battery management system shuts off the power output signal based on the comparison result of the total voltage value corresponding to the first resistor in the loop and the resistor in the detection sub-circuit 120 with a preset voltage value.

[0055] For further details, please refer to Figure 2 , Figure 2 This is a second schematic diagram of a battery protection circuit provided in an embodiment of this application. Figure 2 As shown, the temperature sensing resistor connection terminal RT includes the discharge high temperature sensing resistor connection terminal RDOT of the battery management system (BMS) of the battery pack.

[0056] The battery protection circuit 10 further includes a second resistor R2, which is disposed between the discharge high temperature detection resistor connection terminal RDOT and the first end of the first resistor R1.

[0057] In one possible implementation of this application, the second resistor R2 can be selected as a resistor with a resistance of 22KΩ.

[0058] Here, the discharge high temperature detection resistor connection terminal RDOT can adjust the discharge high temperature protection threshold of the battery management system (BMS) according to the resistance value of the second resistor R2.

[0059] For example, when the battery management system (BMS) receives a signal to perform high-temperature discharge protection on the battery pack, it determines through voltage detection that the resistance value in the battery protection circuit 10 is greater than the resistance value corresponding to the high-temperature discharge protection threshold, and shuts off the power output signal of the high-temperature discharge detection resistor connection terminal RDOT to trigger high-temperature discharge protection on the battery pack.

[0060] Furthermore, such as Figure 2 As shown, the battery protection circuit 10 also includes a third resistor R3, a fourth resistor R4, and a fifth resistor R5.

[0061] The first end of the third resistor R3 is connected to the charging high temperature detection resistor connection terminal RCOT of the battery management system (BMS), and the second end of the third resistor R3 is connected to the second end of the first resistor R1.

[0062] In one possible embodiment of this application, the third resistor R3 can be a resistor with a resistance of 41.2KΩ, the fourth resistor R4 can be a resistor with a resistance of 10KΩ and an error within 1%, and the fifth resistor R5 can be a resistor with a resistance of 300KΩ and an error within 1%.

[0063] Here, the charging high temperature detection resistor connection terminal RCOT can adjust the charging high temperature protection threshold of the battery management system (BMS) according to the resistance value of the third resistor R3.

[0064] The first end of the fourth resistor R4 is connected to the charge / discharge low temperature detection resistor connection terminal RUT of the battery management system BMS, the second end of the fourth resistor R4 is connected to the first end of the fifth resistor R5, and the second end of the fifth resistor R5 is connected to the second end of the first resistor R1.

[0065] Furthermore, such as Figure 2 As shown, the temperature sensing resistor connection terminal RT includes the charge / discharge low temperature sensing resistor connection terminal RUT of the battery management system (BMS) of the battery pack.

[0066] Here, the charge / discharge low temperature detection resistor connection terminal RUT can adjust the charge / discharge low temperature protection threshold of the battery management system (BMS) according to the total resistance value of the fourth resistor R4 and the fifth resistor R5.

[0067] The battery protection circuit 10 further includes a sixth resistor R6 and a seventh resistor R7, which are connected in series and are disposed between the charge / discharge low temperature detection resistor connection terminal RUT and the first end of the first resistor R1.

[0068] Thus, when the battery management system (BMS) receives a signal to protect the battery pack from low temperatures, it determines through voltage detection that the resistance value in the battery protection circuit 10 is greater than the resistance value corresponding to the charge / discharge low temperature protection threshold, and shuts off the power output signal of the charge / discharge low temperature detection resistor connection terminal RUT to trigger the charge / discharge low temperature protection of the battery pack.

[0069] Furthermore, such as Figure 2 As shown, when the sixth resistor R6 and the seventh resistor R7, which are connected in series in the battery protection circuit 10, are located between the charging and discharging low temperature detection resistor connection terminal RUT and the first end of the first resistor R1, the battery protection circuit 10 also includes an eighth resistor R8 and a ninth resistor R9.

[0070] The eighth resistor R8 is disposed between the discharge high temperature detection resistor connection terminal RDOT of the battery management system (BMS) and the second end of the first resistor R1, and the ninth resistor R9 is disposed between the charging high temperature detection resistor connection terminal RCOT of the battery management system (BMS) and the second end of the first resistor R1.

[0071] Furthermore, such as Figure 2 As shown, the detection sub-circuit 120 includes a thermistor NTC.

[0072] The first terminal of the thermistor NTC is connected to the second terminal of the first resistor R1, and the second terminal of the thermistor is grounded to GND.

[0073] In one possible embodiment of this application, the switching sub-circuit 110 includes a transistor Q1.

[0074] In one possible implementation of this application, transistor Q1 may be selected as a MOS transistor with the model number "2N7002". "2N7002" is a commonly used N-channel enhancement-mode MOSFET transistor (metal-oxide-semiconductor field-effect transistor).

[0075] Furthermore, such as Figure 2 As shown, the battery protection circuit 10 also includes a filter sub-circuit RC.

[0076] Wherein, the first end of the filter sub-circuit RC is connected to the first node 1, the second end of the filter sub-circuit RC is grounded to GND, and the first node 1 is between the control terminal G of the switch sub-circuit 110 and the in-situ detection terminal PK.

[0077] In one possible embodiment of this application, the filter sub-circuit RC includes a filter capacitor and a filter resistor. The filter resistor can be a resistor with a resistance of 1MΩ, and the filter capacitor can be a capacitor with a capacitance of 0.1μF and a rated withstand voltage of 50V.

[0078] Furthermore, such as Figure 2 As shown, the battery protection circuit 10 also includes a current-limiting resistor RK and a diode D1.

[0079] Wherein, one end of the diode D1 is connected to the second node 2, and the other end of the diode D1 is grounded to GND. The second node 2 is between the control terminal G of the switch sub-circuit 110 and the first node 1.

[0080] The current-limiting resistor RK is positioned between the first node 1 and the in-situ detection terminal PK.

[0081] In one possible embodiment of this application, the current-limiting resistor RK can be selected as a resistor with a resistance of 2MΩ and an error within 5%, and the diode D1 can be selected as a diode with the model number "LM3Z15VT1G".

[0082] Furthermore, the switch sub-circuit 110, the first resistor R1, the detection sub-circuit 120, the battery management system BMS, and the battery cell are encapsulated into a battery pack, and the in-situ detection terminal PK is led out and disposed outside the encapsulation.

[0083] This application provides a battery protection circuit that, in the form of a purely hardware circuit, prevents arcing that can occur when a battery pack is directly plugged into a load.

[0084] Please see Figure 3 , Figure 3 This is a schematic diagram of a battery pack provided in an embodiment of this application. Figure 3 As shown in the figure, the battery pack 20 provided in this application embodiment includes a battery cell B1, a battery management system BMS, and the aforementioned battery protection circuit 10. The first end of the first resistor R1 in the battery protection circuit 10 is connected to the temperature detection resistor connection terminal RT of the battery management system BMS.

[0085] In one possible implementation of this application, the controller of the battery management system (BMS) may be a chip with the model number "PAD-4X9".

[0086] Furthermore, such as Figure 3 As shown, the battery pack 20 also includes:

[0087] The discharge switch K1 is set on a preset power transmission line, which is one of the positive power transmission line V1+ and the negative power transmission line V1- of the battery pack 20.

[0088] The battery management system (BMS) is configured to control the discharge switch K1 to open based on the voltage value of the temperature detection resistor connection terminal RT when the switch sub-circuit 110 is open, so that the positive power transmission line V1+ and the negative power transmission line V1- of the battery pack 20 have no output.

[0089] In this embodiment, when the battery pack is not connected to a load, the switch sub-circuit 110 is disconnected, so that the battery management system (BMS) controls the discharge switch K1 to disconnect according to the voltage value of the temperature detection resistor connection terminal RT, so that the positive power transmission line V1+ and the negative power transmission line V1- of the battery pack 20 have no output, and thus the battery pack is not charged.

[0090] In another embodiment of this application, when the battery pack is connected to the load, since the battery pack is not charged, there will be no arcing when the battery pack is directly plugged into the load.

[0091] In another embodiment of this application, when the battery pack is assembled into the battery compartment after the load is connected, the battery protection circuit closes the switch sub-circuit in the protection circuit based on the level signal of the in-situ detection terminal, so that the first resistor in the battery protection circuit is bypassed, and the battery management system can detect the temperature of the cell through the voltage value corresponding to the detection sub-circuit in the battery protection circuit.

[0092] The battery pack provided in this application embodiment avoids arcing that can occur when the battery pack is directly plugged into a load, using a purely hardware circuit.

[0093] Please see Figure 4 , Figure 4 This is a schematic diagram of the structure of a battery pack and battery compartment provided in an embodiment of this application. Figure 4 As shown in the illustration, the battery compartment 30 provided in this embodiment includes:

[0094] The in-place contact K2 is used to connect to the temperature sensing resistor connection terminal RT of the battery protection circuit 10 as described above.

[0095] A voltage supply circuit V2 is connected to the in-situ contact K2, and the voltage supply circuit V2 is configured to provide a first level signal to the in-situ contact K2 when the in-situ contact K2 is connected to the temperature sensing resistor connection terminal RT.

[0096] Furthermore, such as Figure 4 As shown, the battery compartment also includes a positive terminal contact P+ and a negative terminal contact P-.

[0097] The voltage supply circuit V2 includes wires to connect the positive connection contact P+ to the in-situ contact K2.

[0098] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the methods, systems, devices, and units described above can be referred to the corresponding processes in the foregoing device embodiments, and will not be repeated here.

[0099] Finally, it should be noted that the above-described embodiments are merely specific implementations of this application, used to illustrate the technical solutions of this application, and not to limit them. The scope of protection of this application is not limited thereto. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the scope of the technology disclosed in this application. Such modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A battery protection circuit, characterized by, The battery protection circuit includes a switching sub-circuit, a first resistor, and a detection sub-circuit. Wherein, the first end of the first resistor is connected to the temperature sensing resistor connection terminal, the second end of the first resistor is connected to the detection sub-circuit, the first terminal of the switch sub-circuit is connected to the first end of the first resistor, the second terminal of the switch sub-circuit is connected to the second end of the first resistor, and the control terminal of the switch sub-circuit is connected to the in-situ detection terminal. Specifically, when the in-situ detection terminal provides a first level signal, the switch sub-circuit closes to disconnect the first resistor; when the in-situ detection terminal provides a second level signal, the switch sub-circuit opens to connect the first resistor.

2. The battery protection circuit of claim 1, wherein, The temperature sensing resistor connection terminal includes the discharge high temperature sensing resistor connection terminal of the battery management system of the battery pack. The battery protection circuit further includes a second resistor, which is disposed between the discharge high temperature detection resistor connection terminal and the first end of the first resistor.

3. The battery protection circuit of claim 2, wherein, The battery protection circuit also includes a third resistor, a fourth resistor, and a fifth resistor. Wherein, the first end of the third resistor is connected to the charging high temperature detection resistor connection terminal of the battery management system, and the second end of the third resistor is connected to the second end of the first resistor; The first end of the fourth resistor is connected to the charge / discharge low-temperature detection resistor connection terminal of the battery management system, the second end of the fourth resistor is connected to the first end of the fifth resistor, and the second end of the fifth resistor is connected to the second end of the first resistor.

4. The battery protection circuit of claim 1, wherein, The temperature sensing resistor connection terminal includes the charge / discharge low-temperature sensing resistor connection terminal of the battery management system of the battery pack. The battery protection circuit further includes a sixth resistor and a seventh resistor, which are connected in series and disposed between the charging and discharging low temperature detection resistor connection terminal and the first end of the first resistor.

5. The battery protection circuit of claim 4, wherein, The battery protection circuit also includes an eighth resistor and a ninth resistor. The eighth resistor is disposed between the discharge high temperature detection resistor connection terminal of the battery management system and the second end of the first resistor, and the ninth resistor is disposed between the charging high temperature detection resistor connection terminal of the battery management system and the second end of the first resistor.

6. The battery protection circuit of claim 1, wherein, The detection sub-circuit includes a thermistor. Wherein, the first end of the thermistor is connected to the second end of the first resistor, and the second end of the thermistor is grounded; And / or, the switching sub-circuit includes a transistor.

7. The battery protection circuit of claim 1, wherein, The battery protection circuit also includes a filter sub-circuit. The first end of the filter sub-circuit is connected to the first node, the second end of the filter sub-circuit is grounded, and the first node is between the control terminal of the switch sub-circuit and the in-situ detection terminal.

8. The battery protection circuit of claim 7, wherein, The battery protection circuit also includes a current-limiting resistor and a diode. Wherein, one end of the diode is connected to the second node, and the other end of the diode is grounded, and the second node is between the control terminal of the switch sub-circuit and the first node; The current-limiting resistor is disposed between the first node and the in-situ detection terminal.

9. The battery protection circuit of any one of claims 1-8, wherein, The switching sub-circuit, the first resistor, the detection sub-circuit, the battery management system, and the battery cell are encapsulated as a battery pack, and the in-situ detection terminal is led out and disposed outside the encapsulation.

10. A battery pack, characterized by, The battery pack includes battery cells, a battery management system, and a battery protection circuit as described in any one of claims 1-9, wherein the first end of the first resistor in the battery protection circuit is connected to the temperature detection resistor connection terminal of the battery management system.

11. The battery pack of claim 10, wherein, The battery pack also includes: A discharge switch is installed on a preset power transmission line, which is one of the positive power transmission line and the negative power transmission line of the battery pack. The battery management system is configured to control the discharge switch to open based on the voltage value of the temperature sensing resistor connection terminal when the switch sub-circuit is open, so that there is no output on the positive power transmission line and the negative power transmission line of the battery pack.

12. A battery compartment characterized by, The battery compartment includes: In-place contact for connecting to the temperature sensing resistor connection terminal of the battery protection circuit as described in any one of claims 1-9; A voltage supply circuit is connected to the in-situ contact, the voltage supply circuit being configured to provide a first level signal to the in-situ contact when the in-situ contact is connected to the temperature sensing resistor connection terminal.

13. The battery compartment of claim 12, wherein, The battery compartment also includes positive wiring contacts and negative wiring contacts; The voltage supply circuit includes wires to connect the positive connection contact to the in-situ contact.

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