Battery reverse connection test circuit

Abstract

This application provides a battery reverse connection test circuit, relating to the field of battery testing technology. The battery reverse connection test circuit includes: a battery under test and a first test circuit; wherein, the first test circuit includes a first switching device and at least one first capacitive load device; the positive terminal of the battery under test is connected to the negative output terminal of the first test circuit, and the negative terminal of the battery under test is connected to the positive output terminal of the first test circuit; the first switching device is configured such that, when closed, the battery under test is connected to the first test circuit, so that the battery under test can be reverse connected through the first capacitive load device. Therefore, when the first switching device is closed, the battery under test can be reverse connected through at least one first capacitive load device, which not only reduces cost but also simplifies the circuit structure, while effectively ensuring the safety of battery reverse connection testing.

Description

Technical Field

[0001] This application relates to the field of battery testing technology, and in particular to a battery reverse connection test circuit. Background Technology

[0002] With the development of battery technology, batteries are being used in a wider range of fields, such as the automotive industry and energy storage industry. In order to ensure circuit safety, it is usually necessary to perform reverse connection tests on batteries.

[0003] In related technologies, inverters are typically used to directly verify the reverse connection protection function of batteries. However, on the one hand, inverters are high-value devices, and their power modules may burn out due to protection failure during reverse connection tests, resulting in high costs per test. On the other hand, there are certain safety risks when workers connect the battery and inverter power lines due to negligence or unclear labeling. Therefore, ensuring the reliability of battery reverse connection tests is crucial. Utility Model Content

[0004] This application provides a battery reverse connection test circuit.

[0005] According to a first aspect of this application, a battery reverse connection test circuit is provided, comprising: a battery to be tested and a first test circuit;

[0006] The first test circuit includes a first switching device and at least one first capacitive load device.

[0007] The positive terminal of the battery under test is connected to the negative output terminal of the first test circuit, and the negative terminal of the battery under test is connected to the positive output terminal of the first test circuit.

[0008] The first switching device is configured such that, when closed, the battery under test is connected to the first test circuit so that the battery under test can be reverse-connected through at least one first capacitive load device.

[0009] Optionally, the battery reverse connection test circuit may also include a second test circuit;

[0010] The second test circuit includes a second switching device and at least one second capacitive load device;

[0011] The positive terminal of the battery under test is connected to the negative output terminal of the second test circuit, and the negative terminal of the battery under test is connected to the positive output terminal of the second test circuit.

[0012] When the second switching device is set to closed and the first switching device is not closed, the battery under test is connected to the second test circuit so that the battery under test can be reverse connected through at least one second capacitive load device.

[0013] The second and first switching devices are also configured such that when both are closed, the battery under test is connected to the first and second test circuits to perform a reverse connection test on the battery under test through at least one first capacitive load device and at least one second capacitive load device.

[0014] Optionally, the battery under test is equipped with a battery management system;

[0015] The battery management system is used to trigger circuit protection when the battery under test is connected to the first test circuit and / or the second test circuit.

[0016] Optionally, the battery management system is equipped with a switching transistor;

[0017] The switching transistor is used to be in the off state when the battery management system triggers circuit protection, so that the battery reverse connection test circuit is in an open circuit state.

[0018] Optionally, indicator lights are included in the battery management system;

[0019] The indicator light is used to illuminate when the battery management system triggers circuit protection.

[0020] Optionally, the first test circuit may also include a third switching device and a bleed resistor;

[0021] The first connection terminal of the third switching device is connected to one end of the first test circuit and / or the second test circuit, the second connection terminal of the third switching device is connected to the other end of the first test circuit and / or the second test circuit, the third connection terminal of the third switching device is connected to one end of the bleeder resistor, and the fourth connection terminal of the third switching device is connected to the other end of the bleeder resistor.

[0022] The third switching device is configured to, when closed, cause at least one first capacitive load device and / or at least one second capacitive load device to be in a discharged state.

[0023] Optionally, at least one first capacitive load device includes three capacitive load devices, and / or at least one second capacitive load device includes seven capacitive load devices.

[0024] Optionally, the first capacitive load device includes a capacitor.

[0025] Optionally, the first test circuit may also include a Kth test circuit;

[0026] The Kth test circuit includes the (K+1)th switching device and at least one capacitive load device, where K is an integer greater than 2.

[0027] Optionally, when K is 3, the Kth test circuit includes two capacitive load devices;

[0028] When K is 4, the Kth test circuit includes eight capacitive load devices.

[0029] In summary, the battery reverse connection test circuit provided in this application has at least the following beneficial effects: the battery reverse connection test circuit includes a battery under test and a first test circuit, the first test circuit including a first switching device and at least one first capacitive load device. Therefore, when the first switching device is closed, the battery under test can be reverse-connected using at least one first capacitive load device, which not only reduces costs and simplifies the circuit structure, but also effectively ensures the safety of the battery reverse connection test. Attached Figure Description

[0030] To more clearly illustrate the specific embodiments of this application or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 A schematic diagram of a battery reverse connection test circuit provided for an embodiment of this application;

[0032] Figure 2 A schematic diagram of a battery reverse connection test circuit provided for an embodiment of this application;

[0033] Figure 3 A schematic diagram of a battery reverse connection test circuit provided for an embodiment of this application;

[0034] Figure 4 This is a schematic diagram of a battery reverse connection test circuit provided for an embodiment of this application. Detailed Implementation

[0035] To make the above and other features and advantages of this application clearer, the application is further described below with reference to the accompanying drawings. It should be understood that the specific embodiments given herein are for the purpose of explanation to those skilled in the art, and are exemplary only, not restrictive.

[0036] In the following description, numerous specific details are set forth to provide a thorough understanding of this application. However, it will be apparent to those skilled in the art that the specific details are not required to practice this application. In other instances, well-known steps or operations have not been described in detail to avoid obscuring this application.

[0037] Figure 1 This application provides a battery reverse connection test circuit.

[0038] refer to Figure 1 As shown, this application provides a battery reverse connection test circuit, including the battery to be tested and a first test circuit.

[0039] The first test circuit may include a first switching device and at least one first capacitive load device. The positive terminal of the battery under test may be connected to the negative output terminal of the first test circuit, and the negative terminal of the battery under test may be connected to the positive output terminal of the first test circuit.

[0040] It is understood that a battery can include individual cells, battery modules, battery packs, battery clusters, battery stacks, and battery systems.

[0041] Among them, a single battery cell is the most basic battery unit, usually referring to a single battery, such as an independent battery cell in a lithium-ion battery. A battery module is a module composed of multiple single battery cells combined in series or parallel. A battery pack is an overall packaged structure containing one or more battery modules, as well as necessary additional components such as protection circuits and cooling systems. A battery cluster refers to a larger unit consisting of a group of battery packs or battery modules. A battery stack is a large-scale energy storage solution formed by stacking multiple battery clusters together. A battery system encompasses all levels from single battery cells to the entire energy storage solution, and also includes supporting facilities such as management systems, thermal management, and safety monitoring.

[0042] The first switching device can be any switching device, such as a single-pole double-throw switch, a double-pole double-throw switch, or a reed switch, etc. This application does not limit it.

[0043] In addition, the first capacitive load may include a capacitor, such as a supercapacitor or a conventional capacitor, which will be referred to as a capacitor for ease of description, and this application does not limit it.

[0044] Optionally, when there are multiple first capacitive load devices, at least one first capacitive load is connected in parallel with the remaining first capacitive loads, or multiple first capacitive loads can be connected in parallel with multiple first capacitive loads; the first switching device is connected in series with at least one first capacitive load device.

[0045] It is understood that, in the embodiments of this application, the capacitor can be charged before the battery is reverse-connected to store energy.

[0046] Optionally, the first test circuit may include one first capacitive load device, or it may include multiple first capacitive load devices, that is, it may include one capacitor, or it may include multiple capacitors, such as 2 capacitors, 3 capacitors, 5 capacitors, 8 capacitors, etc. In addition, the capacitance value of the capacitor may be 2200μF, 3000μF, or other capacitance values, etc. This application does not limit the number and capacitance value of the capacitors.

[0047] It is understandable that when a capacitor stores a certain amount of energy, since the positive terminal of the battery under test is connected to the negative output terminal of the first test circuit, and the negative terminal of the battery under test is connected to the positive output terminal of the first test circuit, that is, the positive and negative terminals of the battery under test are in a reverse connection state. If the first switching device is closed at this time, the battery under test is connected to the first test circuit, and the capacitor acts as an inverter, instantaneously discharging to form a large current surge, thereby triggering the reverse connection protection of the battery under test, thus achieving the reverse connection test of the battery under test. Therefore, in this embodiment, a capacitor can be used to achieve the reverse connection test of the battery and verify the reverse connection protection function. This not only effectively avoids the potential risk of inverter burnout, reduces costs and losses, but also simplifies the circuit structure, shortens the test time, and effectively reduces the safety risks of battery reverse connection testing.

[0048] In this embodiment of the application, the battery reverse connection test circuit includes a battery under test and a first test circuit. The first test circuit includes a first switching device and at least one first capacitive load device. Thus, when the first switching device is closed, the battery under test can be reverse connected through at least one first capacitive load device. This not only reduces costs but also simplifies the circuit structure and effectively ensures the safety of the battery reverse connection test.

[0049] It should be noted that, Figure 1 The devices and connections shown are illustrative and can be adjusted as needed; this application does not impose any limitations on them.

[0050] Understandably, in Figure 1 Based on this, the battery reverse connection test circuit may further include a second test circuit, which includes a second switching device and at least one second capacitive load device. The following describes the process in conjunction with... Figure 2 The battery reverse connection test circuit provided in this application will be further described.

[0051] The positive terminal of the battery under test is connected to the negative output terminal of the second test circuit, and the negative terminal of the battery under test is connected to the positive output terminal of the second test circuit.

[0052] The second switching device and the first switching device can be the same type of switching device, or they can be different types of switching devices, etc. This application does not limit them in this regard.

[0053] In addition, the second capacitive load device and the first capacitive load device can be the same type of device, or they can be different types of devices, for example, they can be capacitors with the same capacitance value, or they can be capacitors with different capacitance values, or they can be supercapacitors and capacitors, etc. This application does not limit them in this regard.

[0054] Therefore, in the embodiments of this application, the second test circuit may be the same as the first test circuit, or it may be different from the first test circuit, and this application does not limit this.

[0055] Furthermore, when the second switching device is closed and the first switching device is not closed, the battery under test is connected to the second test circuit through the second switching device. At least one second capacitive load device instantaneously discharges, forming a large current surge, triggering the reverse connection protection of the battery under test, thereby realizing the reverse connection test of the battery under test. Therefore, in this embodiment, at least one second capacitive load device in the second test circuit can be used to perform reverse connection testing of the battery and verify the reverse connection protection function. This not only reduces costs but also simplifies the circuit structure and effectively reduces the safety risks of reverse connection testing of the battery.

[0056] Furthermore, when the second capacitive load device is the same as the first capacitive load device, the same effect can be achieved by either closing only the first switch device to perform a reverse connection test on the battery under test through the first capacitive load device, or closing only the second switch device to perform a reverse connection test on the battery under test through the second capacitive load device. When the second capacitive load device is different from the first capacitive load device, depending on the capacity of the first and second capacitive load devices, it is possible to select closing only the first switch device, closing only the second switch device, or closing both the first and second switch devices to simulate inverters of different power levels, thereby performing reverse connection tests on the battery under test to varying degrees.

[0057] Understandably, when both the first and second switching devices are closed, the battery under test is connected to both the first and second test circuits, allowing for reverse connection testing via the first and second capacitive load devices. In other words, the first and second test circuits are connected in parallel, and the first and second capacitive load devices can simulate a higher-power inverter to perform reverse connection testing on the battery under test, verifying the reverse connection protection function. This not only effectively avoids the potential risk of inverter burnout, reducing costs and losses, but also simplifies the circuit structure, shortens the testing time, and effectively reduces the safety risks of reverse connection testing of the battery.

[0058] In this embodiment, the battery reverse connection test circuit includes a first test circuit and a second test circuit. By closing the first and second switching devices, and utilizing the first and second capacitive load devices, inverters of different power can be simulated to perform reverse connection tests on the battery under test. This not only reduces costs but also simplifies the circuit structure and effectively ensures the safety of the battery reverse connection test.

[0059] Optionally, the battery reverse connection test circuit may also include a third switching device and a bleed resistor.

[0060] In this configuration, the first connection terminal of the third switching device can be connected to one end of the first test circuit, the second connection terminal of the third switching device can be connected to the other end of the first test circuit, the third connection terminal of the third switching device can be connected to one end of the bleeder resistor, and the fourth connection terminal of the third switching device can be connected to the other end of the bleeder resistor. Alternatively, the first connection terminal of the third switching device can be connected to one end of the second test circuit, the second connection terminal of the third switching device can be connected to the other end of the second test circuit, the third connection terminal of the third switching device can be connected to one end of the bleeder resistor, and the fourth connection terminal of the third switching device can be connected to the other end of the bleeder resistor.

[0061] The third switching device may be the same as the first switching device, or it may be different from the first switching device, etc. This application does not limit this.

[0062] In addition, the bleeder resistor can be any type of resistor, and its value can be changed as needed. This application does not limit its type or value.

[0063] Optionally, at least one first capacitive load device may include three capacitive load devices, and at least one second capacitive load device may include seven capacitive load devices; this application does not limit this.

[0064] Therefore, in this embodiment, after performing a reverse connection test on the battery under test, since there may be residual energy in the first capacitive load device, the battery under test can be connected to the third switch device and the bleed resistor by closing the third switch device. This allows at least one of the first capacitive load devices to be in a discharging state, achieving discharge through the bleed resistor, thereby improving safety. Alternatively, when the third switch device is connected to the second test circuit, closing the third switch device causes at least one of the second capacitive load devices to be in a discharging state, achieving discharge through the bleed resistor, thereby improving safety. Or, when the third switch device is connected to both the first and second test circuits, closing the third switch device causes both at least one first capacitive load device and at least one second capacitive load device to be in a discharging state, achieving discharge through the bleed resistor, thereby improving safety.

[0065] Optionally, the battery reverse connection test circuit may also include a Kth test circuit, wherein the Kth test circuit includes a K+1th switching device and at least one capacitive load device.

[0066] Where K can be any integer greater than 2, such as 3, 4, 5, 6, 7, etc., this application does not impose any restrictions on it.

[0067] It is understandable that when K is 4, that is, the battery reverse connection test circuit includes a third test circuit, a fourth test circuit, etc. The third test circuit may include a fourth switching device and several third capacitive load devices, and the fourth test circuit may include a fifth switching device and several fourth capacitive load devices, etc. The battery under test can be connected through any one of the first, second, third, and fourth test circuits, or any two, three, or four of them, to simulate the effects of inverters with different power ratings. This application does not limit this.

[0068] Optionally, when K is 3, the third test circuit may include two capacitive load devices, and when K is 4, the fourth test circuit may include eight capacitive load devices.

[0069] For example, when K is 4, it can be done as follows: Figure 3As shown, the first test circuit may include a first switching device SW1 and three first capacitive load devices C1, C2, and C3; the second test circuit may include a second switching device SW2 and seven second capacitive load devices C4, C5, C6, C7, C8, C9, and C10; the third test circuit may include a fourth switching device SW3 and two third capacitive load devices C11 and C12; and the fourth test circuit may include a fifth switching device SW4 and eight fourth capacitive load devices C13, C14, C15, C16, C17, C18, C19, and C20.

[0070] In this configuration, when the capacitance values ​​of C1-C20 are all 2200μF, SW1 controls 3 capacitors (6600μF), SW2 controls 7 capacitors (15400μF), SW3 controls 2 capacitors (4400μF), and SW4 controls 8 capacitors (17600μF). The total capacitance value in the battery reverse connection test circuit can be changed by controlling the conduction state of these four switches, simulating different models of low-voltage inverters, such as 15KW, 12KW, 8KW, and 3KW, to perform different reverse connection tests on the battery under test. Furthermore, it is understood that in other optional embodiments, the capacitance values ​​of C1-C20 may also include other capacitance values ​​besides 2200μF. The capacitance values ​​of C1-C20 can be all the same, all different, or partially the same and partially different; and the number of capacitors included in each test circuit can also be changed or adjusted based on the changes in capacitance values.

[0071] It should be noted that the above examples are merely illustrative and should not be construed as limiting the number and capacitance of capacitive load devices in the various test circuits of this application.

[0072] Therefore, in the embodiments of this application, during the actual testing process, more test circuits and more capacitive load devices can be set up according to actual needs. One or more test circuits can be connected to the battery under test to simulate the effect of inverters with different power. The circuit structure is simple and the cost is low. At the same time, it can also effectively ensure the safety of reverse connection testing of batteries.

[0073] Optionally, a battery management system can also be installed in the battery to be tested.

[0074] The battery management system (BMS) can be used to trigger circuit protection when the battery under test is connected to the first test circuit and / or the second test circuit.

[0075] Understandably, battery management systems (BMS) typically collect key parameters of the battery in real time, such as voltage, current, and temperature, and use algorithms to estimate the battery state. Through functions like equalization management and thermal management, they ensure the efficient and safe operation of the battery pack. Therefore, the BMS in this embodiment can include a voltage detection module. This module can detect the polarity and value of the voltage in the circuit to determine if it is a reverse voltage. If it is a reverse voltage, the BMS will disconnect the battery under test from the external circuit to achieve reverse connection protection.

[0076] Understandably, when the first switch is closed and the battery under test is connected to the first test circuit, if the voltage detection module detects a reverse voltage greater than 1V, the battery management system will disconnect the battery under test from the external circuit to achieve reverse connection protection. Alternatively, when the second switch is closed and the battery under test is connected to the second test circuit, if the voltage detection module detects a reverse voltage greater than 1V, the battery management system will trigger reverse connection protection. Or, when both the first and second switches are closed, and the battery under test is connected to both the first and second test circuits, if the voltage detection module detects a reverse voltage greater than 1V, the battery management system will trigger reverse connection protection.

[0077] Therefore, in this embodiment of the application, in order to prevent the battery under test from being damaged during the reverse connection test, the voltage in the circuit can be detected by the battery management system. When a reverse voltage greater than 1V is detected, the connection between the battery under test and the external circuit is disconnected to realize the reverse connection protection of the battery. This can effectively reduce the risk of the battery under test being damaged and improve the safety of the circuit.

[0078] Optionally, a switching transistor can be installed in the battery management system.

[0079] The switching transistor can be used to be in the off state when the battery management system triggers circuit protection, so that the battery reverse connection test circuit is in an open circuit state.

[0080] The switching transistor can be a MOSFET, an insulated gate bipolar transistor (IGBT), or other devices, and this application does not limit the specific device used.

[0081] For example, if the switching transistor is a MOSFET, when the battery under test is reverse-connected to the first capacitive load device through the first switching device, if the voltage detection module detects a reverse voltage greater than 1V, the battery management system will output a low level to turn off the switching transistor, thereby disconnecting the battery under test from the external circuit. The entire battery reverse connection test circuit will be in an open-circuit state, thus achieving reverse connection protection. This application does not limit this aspect.

[0082] Therefore, in this embodiment of the application, during the reverse connection test of the battery, the connection between the battery under test and the external circuit can be blocked in time by the switching transistor, so as to protect the entire reverse connection test circuit, effectively ensuring circuit safety and reducing safety risks.

[0083] Optionally, indicator lights can be configured in the battery management system.

[0084] The signal light can be a light-emitting diode or other types of signal indicating devices, and this application does not limit it.

[0085] Therefore, in this embodiment of the application, the indicator light can be used to trigger the circuit protection when the battery management system triggers it. That is, the illumination state of the indicator light indicates that the circuit protection has been successfully achieved during the battery reverse connection test.

[0086] Optionally, the battery reverse connection test circuit may also include a power supply module.

[0087] The power module can be used to charge the first capacitive load device, or it can be used to charge the second capacitive load device, or it can be used to charge other capacitive load devices in the entire battery reverse connection test circuit, etc. This application does not limit it in this way.

[0088] Optionally, the battery under test can be used to charge the first capacitive load device even when the reverse connection test is not performed. In this case, the positive terminal of the battery under test can be connected to the positive output terminal of the first test circuit, and the negative terminal of the battery under test can be connected to the negative output terminal of the first test circuit. Thus, by closing the first switching device, the first capacitive load device can be charged through the battery under test.

[0089] It is understood that the battery under test can also charge the second capacitive load device, or it can also charge other capacitive load devices in the reverse connection test circuit of the entire battery, etc., and this application does not limit it in this way.

[0090] Optionally, the battery reverse connection test circuit may also include a first terminal and a second terminal.

[0091] The first terminal is connected to the positive terminal of the battery under test and the negative output terminal of the first test circuit, respectively, and the second terminal is connected to the negative terminal of the battery under test and the positive output terminal of the first test circuit, respectively.

[0092] like Figure 4As shown, the first terminal J1 can also be connected to the first connection terminal of the third switching device SW5, and the second terminal J2 can also be connected to the second connection terminal of the third switching device SW5, so that when the third switching device is closed, the first capacitive load device is in a discharging state through the discharge resistor R1.

[0093] Therefore, in this embodiment of the application, the components in the circuit can be connected through the terminals to achieve rapid switching of battery polarity, which is simple and easy to operate.

[0094] Understandable, Figures 1 to 4 The devices and connection methods shown are for illustrative purposes only, and the connection relationships between the various circuit devices are only partially shown. They should not be taken as a limitation on the connection relationships between the various circuit devices in the embodiments of this application.

[0095] It should be noted that the various devices, components, units, and modules mentioned in this application are all illustrative and should not be taken as limitations on their specific placement, quantity, etc.

[0096] The battery reverse connection test circuit provided in this application includes a battery under test and a first test circuit. Thus, when the first switching device is closed, the battery under test can be reverse connected by a first capacitive load device. This not only reduces costs but also simplifies the circuit structure and effectively ensures the safety of the battery reverse connection test.

[0097] It should be understood that the various modules / units of the device of this application can be implemented wholly or partially through software, hardware, firmware, or a combination thereof. Each module / unit can be embedded in the processor of the electronic device in hardware or firmware form or independent of the processor, or it can be stored in the memory of the electronic device in software form for the processor to call to execute the operation of each module / unit. Each module / unit can be implemented as an independent component or module, or two or more modules / units can be implemented as a single component or module.

[0098] The technical features described above can be combined arbitrarily. Although not all possible combinations of these technical features are described, any combination of these technical features should be considered to be covered by this specification, provided that such combination does not contain contradictions.

[0099] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A battery reverse connection test circuit, characterized in that, include: The battery to be tested and the first test circuit; The first test circuit includes a first switching device and at least one first capacitive load device. The positive terminal of the battery under test is connected to the negative output terminal of the first test circuit, and the negative terminal of the battery under test is connected to the positive output terminal of the first test circuit. The first switching device is configured such that, when closed, the battery under test is connected to the first test circuit, so that the battery under test can be reverse-connected for testing by the at least one first capacitive load device.

2. The battery reverse connection test circuit as described in claim 1, characterized in that, It also includes a second test circuit; The second test circuit includes a second switching device and at least one second capacitive load device; The positive terminal of the battery under test is connected to the negative output terminal of the second test circuit, and the negative terminal of the battery under test is connected to the positive output terminal of the second test circuit. When the second switching device is set to closed and the first switching device is not closed, the battery under test is connected to the second test circuit so as to perform a reverse connection test on the battery under test through the at least one second capacitive load device; When both the second and first switching devices are closed, the battery under test is connected to the first and second test circuits to perform a reverse connection test on the battery under test through the at least one first capacitive load device and the at least one second capacitive load device.

3. The battery reverse connection test circuit as described in claim 2, characterized in that, The battery under test is equipped with a battery management system; The battery management system is used to trigger circuit protection when the battery under test is connected to the first test circuit and / or the second test circuit.

4. The battery reverse connection test circuit as described in claim 3, characterized in that, The battery management system is equipped with a switching transistor; The switching transistor is used to be in the off state when the battery management system triggers circuit protection, so that the battery reverse connection test circuit is in an open circuit state.

5. The battery reverse connection test circuit as described in claim 3, characterized in that, The battery management system is equipped with indicator lights; The indicator light is used to illuminate when the battery management system triggers circuit protection.

6. The battery reverse connection test circuit as described in claim 2, characterized in that, It also includes a third switching device and a bleeder resistor; The first connection terminal of the third switching device is connected to one end of the first test circuit and / or the second test circuit, the second connection terminal of the third switching device is connected to the other end of the first test circuit and / or the second test circuit, the third connection terminal of the third switching device is connected to one end of the bleeder resistor, and the fourth connection terminal of the third switching device is connected to the other end of the bleeder resistor. The third switching device is configured to, when closed, cause the at least one first capacitive load device and / or the at least one second capacitive load device to be in a discharged state.

7. The battery reverse connection test circuit as described in claim 2, characterized in that, The at least one first capacitive load device includes three capacitive load devices, and / or the at least one second capacitive load device includes seven capacitive load devices.

8. The battery reverse connection test circuit as described in claim 1, characterized in that, The first capacitive load device includes a capacitor.

9. The battery reverse connection test circuit as described in claim 1, characterized in that, It also includes the Kth test circuit; The Kth test circuit includes a K+1th switching device and at least one capacitive load device, where K is an integer greater than 2.

10. The battery reverse connection test circuit as described in claim 9, characterized in that, When K is 3, the Kth test circuit includes two capacitive load devices; When K is 4, the Kth test circuit includes eight capacitive load devices.

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