Circuit detection protection device for battery module and battery module

Abstract

The utility model belongs to the technical field of batteries, and discloses a circuit detection and protection device for a battery module and the battery module, the circuit detection and protection device comprises a monitoring circuit, the monitoring circuit comprises a plurality of detection pieces, the detection pieces are used for being arranged corresponding to battery cells of the battery module, and the detection pieces are arranged on explosion-proof valves of the battery cells; the detection piece is provided with a first wire and a second wire, and the detection piece is connected to the monitoring circuit in parallel through the first wire and the second wire, so that the first wire or the second wire corresponding to the anti-explosion valve is disconnected due to stress during explosion of the anti-explosion valve, or the first wire or / and the second wire corresponding to the anti-explosion valve are / is in short-circuit connection. The circuit detection protection device can position the positions of the valve opening battery cell monomers, provides a corresponding protection strategy for prevention and control of thermal runaway diffusion of the battery module, reduces harm caused by thermal runaway diffusion of the battery module, and improves the use safety of the battery module.

Description

Technical Field

[0001] This utility model belongs to the field of battery technology, specifically relating to a circuit detection and protection device for a battery module and a battery module. Background Technology

[0002] During the use of battery modules, the potential for individual battery cells to explode under abuse must be considered. Related technologies incorporate explosion-proof valves on individual cells for pressure relief. However, existing detection circuits for the opening of the explosion-proof valves corresponding to individual cells within battery modules cannot locate the opening cell and lack active valve opening functionality. This fails to effectively delay or block the heat diffusion process, resulting in the explosion-proof valves of one cell opening while those of other cells remain closed. These other cells passively open their valves only after a rapid increase in temperature and internal pressure, exacerbating heat diffusion and potentially causing deflagration. Utility Model Content

[0003] In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide a circuit detection and protection device for a battery module and a battery module.

[0004] A first aspect of this utility model provides a circuit detection and protection device for a battery module, comprising: a monitoring circuit, the monitoring circuit including a plurality of detection chips, the detection chips being configured to correspond to individual cells of the battery module, and the detection chips being disposed on the explosion-proof valve of the individual cells;

[0005] The detection plate is provided with a first wire and a second wire. The detection plate is connected in parallel to the monitoring circuit through the first wire and the second wire, so that when the explosion-proof valve explodes, the first wire and / or the second wire corresponding to the explosion-proof valve will be disconnected due to the force, or the first wire and / or the second wire corresponding to the explosion-proof valve will be short-circuited.

[0006] The circuit detection and protection device for battery modules provided by this utility model has a simple structure. The first and second wires on the detection chip can be disconnected or short-circuited under the impact force when the explosion-proof valve is opened due to pressure relief. By obtaining the total voltage information of the first and second wires of the monitoring circuit formed by the detection chip, the position of the valve-opening cell can be located, providing a corresponding protection strategy for the prevention and control of thermal runaway propagation of the battery module, reducing the harm caused by thermal runaway propagation of the battery module, and improving the safety of the battery module.

[0007] In addition, the circuit detection and protection device for battery modules of this utility model may also have the following additional technical features:

[0008] Preferably, the first wire and the second wire are arranged in parallel, and the first wire and the second wire are bent and laid on the detection plate.

[0009] Preferably, the first conductor and the second conductor are in the shape of a broken line or an arc.

[0010] Preferably, both the first conductor and the second conductor include multiple first straight line segments arranged in parallel and spaced apart. A second straight line segment connects two adjacent first straight line segments on the same side of the first conductor or the second conductor. The two adjacent second straight line segments are staggered.

[0011] or,

[0012] Both the first conductor and the second conductor include multiple first straight line segments arranged in parallel and spaced apart. A second straight line segment connects two adjacent first straight line segments located on opposite ends within the first conductor or the second conductor, and each second straight line segment is arranged in parallel.

[0013] or,

[0014] Both the first conductor and the second conductor include multiple first arc segments arranged in parallel and spaced apart. A second arc segment connects two adjacent first arc segments located on opposite ends within the first conductor or the second conductor, and each second arc segment is arranged in parallel.

[0015] Preferably, the monitoring circuit further includes a power supply and a sampling chip, wherein the power supply has a positive signal output terminal and a negative signal input terminal, the first wire and the second wire each have a first end and a second end, the first end of the first wire corresponding to the detection chip is electrically connected to the positive signal output terminal of the power supply, the second end of the first wire corresponding to the detection chip is electrically connected to the first end of the second wire, and the second end of the second wire corresponding to the detection chip is electrically connected to the negative signal input terminal of the power supply;

[0016] The sampling chip is used to obtain the total voltage value information of the first and second wires corresponding to the detection chip.

[0017] Preferably, a first current-limiting resistor is provided on the wire between the first end of the first wire and the positive signal output terminal of the power supply, and the signal acquisition terminal of the sampling chip is electrically connected to the wire between the first current-limiting resistor and the first end of the first wire.

[0018] or,

[0019] A second current-limiting resistor is provided on the wire between the second end of the second wire and the negative signal output terminal of the power supply. The signal acquisition terminal of the sampling chip is electrically connected to the wire between the second current-limiting resistor and the second end of the second wire.

[0020] Preferably, the monitoring circuit further includes a processor, the signal output terminal of the sampling chip is connected to the signal input terminal of the processor, and the signal output terminal of the processor is electrically connected to the control terminal of the power supply.

[0021] Preferably, if the corresponding first wire and / or second wire on the detection chip is in an open state, the total voltage output by the sampling chip is the first voltage value;

[0022] If the corresponding first wire and / or second wire on the detection chip is in a short-circuit connection state, the total voltage output by the sampling chip is the second voltage value, and the first voltage value is less than the second voltage value.

[0023] Preferably, the sampling chip is used to acquire the total voltage information of the first wire and the second wire corresponding to the detection chip, and send the total voltage information of the first wire and the second wire corresponding to the detection chip to the processor;

[0024] The processor is used to determine the working state of the explosion-proof valve corresponding to the detection piece based on the total voltage information of the first and second wires corresponding to the detection piece. The working state of the explosion-proof valve includes an open valve state and a closed valve state.

[0025] If the processor determines that the explosion-proof valve corresponding to any detection piece is in the open state, the processor controls the power supply to switch from the first power to the second power to operate, so that the first wire and the second wire corresponding to the remaining detection pieces are heated to burn through the corresponding explosion-proof valve, wherein the first power is less than the second power.

[0026] A second aspect of this utility model provides a battery module, including multiple individual battery cells and the circuit detection and protection device for the battery module as described in any embodiment of this application, wherein an explosion-proof valve is provided on the individual battery cells and the detection plate is provided on the explosion-proof valve.

[0027] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0028] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0029] Figure 1A schematic diagram showing the installation location of the circuit detection and protection device provided in this embodiment on the battery module;

[0030] Figure 2 for Figure 1 The first structural diagram of the detection chip;

[0031] Figure 3 This is a second structural diagram of the detection strip provided in the embodiments of this application;

[0032] Figure 4 This is a third structural diagram of the detection chip provided in the embodiments of this application;

[0033] Figure 5 The schematic diagram of the detection and protection principle of the circuit detection and protection device provided in the embodiment of this application.

[0034] In the above image:

[0035] 100 Battery module; 110 Individual battery cell; 111 Explosion-proof valve;

[0036] 200 Detection piece; 210 First lead wire; 220 Second lead wire; 230 Hollowed-out notch;

[0037] 300 Power supply; 310 Sampling chip; 320 Processor; 330 First current-limiting resistor. Detailed Implementation

[0038] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the relevant utility model and not intended to limit the scope of the utility model. Furthermore, it should be noted that, for ease of description, only the parts relevant to the utility model are shown in the accompanying drawings.

[0039] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0040] The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The singular forms “a,” “the,” and “the” as used in this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0041] Unless the context otherwise requires, throughout the specification and claims, the term "comprising" is interpreted as open and encompassing, that is, "including, but not limited to".

[0042] In the description of this specification, the terms "one embodiment," "some embodiments," "exemplary embodiment," "example," "specific example," or "some examples," etc., are intended to indicate that a particular feature, structure, material, or characteristic associated with that embodiment or example is included in at least one embodiment or example of this disclosure. The illustrative representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics mentioned may be included in any suitable manner in any one or more embodiments or examples.

[0043] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this disclosure, unless otherwise stated, "a plurality of" means two or more.

[0044] During use, the potential for explosion of individual battery cells 110 within the battery module 100 needs to be considered. In related technologies, explosion-proof valves 111 are installed on individual battery cells 110 to relieve pressure. However, the valve opening detection circuit for the explosion-proof valves 111 corresponding to individual battery cells 110 in the existing battery module 100 cannot locate the position of the opening cell. This results in the explosion-proof valve 111 corresponding to one cell opening while the explosion-proof valves 111 corresponding to the other cells remaining closed, potentially leading to thermal runaway or even deflagration.

[0045] Existing thermal runaway warning devices for battery modules 100, such as pressure sensors, gas sensors, and smoke sensors, all suffer from delayed alarms. Furthermore, the lack of corresponding warning and protection devices for battery modules 100 and internal battery cells 110 poses a significant safety hazard.

[0046] To at least partially solve the above-mentioned technical problems, such as Figures 1 to 5 As shown, in a first aspect, this utility model provides a circuit detection and protection device 100 for a battery module, comprising: a monitoring circuit, the monitoring circuit including a plurality of detection chips 200, the detection chips 200 being configured to correspond to the individual battery cells 110 of the battery module 100, and the detection chips 200 being disposed on the explosion-proof valve 111 of the individual battery cells 110;

[0047] The detection plate 200 is provided with a first wire 210 and a second wire 220. The detection plate 200 is connected in parallel to the monitoring circuit through the first wire 210 and the second wire 220, so that when the explosion-proof valve 111 explodes, the first wire 210 and / or the second wire 220 corresponding to the explosion-proof valve 111 will be disconnected due to the force, or the first wire 210 and / or the second wire 220 corresponding to the explosion-proof valve 111 will be short-circuited.

[0048] The battery module 100 includes multiple individual battery cells 110, which are connected in series or in parallel to form the battery module 100. Each individual battery cell 110 has an explosion-proof valve 111 at its upper end. When the pressure inside the individual battery cell 110 is too high, the explosion-proof valve 111 will be opened by the medium inside the individual battery cell 110, such as a high-pressure gas-liquid mixture. The explosion-proof valve 111 will burst open, releasing the pressure and thus preventing pressure accumulation from causing an explosion, ensuring safe use.

[0049] The circuit detection and protection device for battery modules provided by this utility model includes a monitoring circuit, which includes multiple detection plates 200. Each detection plate 200 corresponds one-to-one with a battery cell 110 within the battery module 100; that is, the number of detection plates 200 is the same as the number of battery cells 110 within the battery module 100. The detection plates 200 are mounted on the explosion-proof valve 111 of the battery cell 110. Each detection plate 200 is provided with a first wire 210 and a second wire 220. The detection plates 200 are connected in parallel to the monitoring circuit via the first wire 210 and the second wire 220, enabling the monitoring circuit to independently detect each detection plate 200. This allows the location of the valve-opening battery cell 110 to be identified and monitored before the explosion-proof valve 111 opens and thermally runs away, thus alerting personnel to evacuate promptly and quickly, providing more escape time, and providing corresponding protection strategies for the subsequent thermal runaway of the battery module 100.

[0050] Specifically, when the explosion-proof valve 111 of a certain cell 110 within the battery module 100 opens, the first wire 210 and / or the second wire 220 on the detection plate 200 corresponding to that cell 110 will disconnect due to the impact force when the explosion-proof valve 111 explodes, thereby activating the monitoring circuit corresponding to that detection plate 200; or, the first wire 210 and the second wire 220 on the detection plate 200 corresponding to that cell 110 will be short-circuited, as will the first wire 210 and the second wire 220, and the first wire 210 and the second wire 220 will be short-circuited together, thereby short-circuiting the monitoring circuit corresponding to that detection plate 200. The monitoring circuit can acquire the total voltage information of the first wire 210 and the second wire 220 corresponding to the detection plate 200. Based on the acquired total voltage information, the operating state of the explosion-proof valve 111 on the corresponding cell 110 can be determined. The operating state of the explosion-proof valve 111 includes an open state and a closed state.

[0051] The circuit detection and protection device for battery modules provided by this utility model has a simple structure. The first wire 210 and the second wire 220 on the detection piece 200 can be disconnected or short-circuited under the impact force when the explosion-proof valve 111 is released and opened. By obtaining the total voltage information of the first wire 210 and the second wire 220 of the monitoring circuit formed by the detection piece 200, the position of the valve-opening cell 110 can be located, providing a corresponding protection strategy for the thermal runaway propagation prevention and control of the battery module 100, reducing the harm caused by the thermal runaway propagation of the battery module 100, and improving the safety of the battery module 100 in use.

[0052] In some implementations, such as Figures 2 to 5 As shown, the first wire 210 and the second wire 220 are arranged in parallel, and the first wire 210 and the second wire 220 are bent and laid on the detection plate 200.

[0053] Specifically, both the first conductor 210 and the second conductor 220 are high-temperature resistant (1000~2000℃) metal conductors, such as copper, aluminum, and stainless steel. The detection sheet 200 is made of insulating and thermally conductive materials such as boron nitride ceramic, alumina ceramic, and thermally conductive silicone sheet. The first conductor 210 and the second conductor 220 are arranged in parallel and bent on the detection sheet 200, so that the first conductor 210 and the second conductor 220 are spaced apart on the detection sheet 200 and can cover the entire detection sheet 200. When the battery module 100 is subjected to force or the internal structure of the battery cell 110 expands, the internal pressure is released through the explosion-proof valve 111. The liquid impact force when the explosion-proof valve 111 explodes can disconnect the first wire 210 and / or the second wire 220, thereby breaking the corresponding monitoring circuit; or, the liquid (such as electrolyte) when the explosion-proof valve 111 explodes is located between the first wire 210 and the second wire 220, thereby connecting the first wire 210 and the second wire 220, short-circuiting the first wire 210 and the second wire 220. The total resistance of the two wires 220 connected in series decreases; or, the liquid (such as electrolyte) during the explosion of the explosion-proof valve 111 is located inside the first wire 210, causing a short circuit inside the first wire 210, reducing the resistance of the first wire 210, and thus reducing the total resistance of the first wire 210 and the second wire 220 connected in series; or, the liquid (such as electrolyte) during the explosion of the explosion-proof valve 111 is located inside the second wire 220, causing a short circuit inside the second wire 220, reducing the resistance of the second wire 220, and thus reducing the total resistance of the first wire 210 and the second wire 220 connected in series.

[0054] It should be noted that the detection piece 200 is also provided with a hollowed-out notch 230, which is opened through the detection piece. The hollowed-out notch 230 can be set in the middle area of ​​the detection piece or in other positions. The first wire 210 and the second wire 220 are suspended at the hollowed-out notch 230. When the explosion valve 111 explodes, the liquid is more likely to cause the first wire 210 or / and the second wire 220 corresponding to the hollowed-out notch 230 to short-circuit and connect, and is also more likely to cause the first wire 210 or / and the second wire 220 corresponding to the hollowed-out notch 230 to break.

[0055] In some embodiments, the first conductor 210 and the second conductor 220 are in the shape of a broken line or an arc.

[0056] Specifically, such as Figure 2 and Figure 3 As shown, the first conductor 210 and the second conductor 220 are arranged in parallel and in a zigzag shape, or, as... Figure 4As shown, the first wire 210 and the second wire 220 are arranged in parallel and are arc-shaped, so that the first wire 210 and the second wire 220 can evenly and densely cover the detection sheet 200, making it easier for the first wire 210 or / and the second wire 220 to break when the explosion-proof valve 111 explodes and sprays, and making the first wire 210 or / and the second wire 220 short-circuited and connected, facilitating subsequent detection of the working state of the explosion-proof valve 111 on the corresponding battery cell 110 to determine whether the battery cell 110 is in a thermal runaway state.

[0057] In some embodiments, the first wire 210 and the second wire 220 each include a plurality of first straight segments arranged in parallel at intervals. Between the two endpoints on the same side of two adjacent first straight segments in the first wire 210 or the second wire 220, a second straight segment is connected, and the two adjacent second straight segments are arranged staggeredly;

[0058] Or,

[0059] the first wire 210 and the second wire 220 each include a plurality of first straight segments arranged in parallel at intervals. Between the two endpoints on the opposite sides of two adjacent first straight segments in the first wire 210 or the second wire 220, a second straight segment is connected, and the second straight segments are arranged in parallel;

[0060] Or,

[0061] the first wire 210 and the second wire 220 each include a plurality of first arc segments arranged in parallel at intervals. Between the two endpoints on the opposite sides of two adjacent first arc segments in the first wire 210 or the second wire 220, a second arc segment is connected, and the second arc segments are arranged in parallel.

[0062] Specifically, there are three different structural forms of the first wire 210 and the second wire 220 on the detection sheet 200, and the first wire 210 and the second wire 220 have the same shape. Exemplarily, as Figure 2 shown, the first structure is: the first wire 210 and the second wire 220 are both in a zigzag shape, and the first wire 210 and the second wire 220 each include a plurality of parallel first straight segments and a plurality of parallel second straight segments, and the first straight segments are perpendicular to the second straight segments. Between the two endpoints on the same side of two adjacent first straight segments in the first wire 210 or the second wire 220, a second straight segment is connected, and the two adjacent second straight segments are arranged staggeredly, and the second straight segments on the same side of the first straight segments are on the same straight line, so that the first straight segments and the second straight segments are alternately connected in sequence to form a zigzag shape.

[0063] As Figure 3As shown, the second structure is as follows: both the first conductor 210 and the second conductor 220 are in the shape of broken lines, and both the first conductor 210 and the second conductor 220 include multiple parallel first straight line segments and multiple parallel second straight line segments. The first straight line segments and the second straight line segments are set at an acute angle. The second straight line segment is connected between the two endpoints of two adjacent first straight line segments in the first conductor 210 or the second conductor 220. The first straight line segments and the second straight line segments are connected alternately to form a V shape.

[0064] like Figure 4 As shown, the third structure is as follows: both the first conductor 210 and the second conductor 220 are arc-shaped, and both the first conductor 210 and the second conductor 220 include multiple parallel first arc segments and multiple parallel second arc segments, and the first arc segments and the second arc segments have opposite bending directions and are connected to form a U-shape.

[0065] In this example, by designing three different shapes for the first wire 210 and the second wire 220, the first wire 210 and the second wire 220 can be densely covered with the detection plate 200, thereby improving the sensitivity of the working state of the explosion-proof valve 111 corresponding to the detection plate 200.

[0066] In some implementations, such as Figure 5 As shown, the monitoring circuit further includes a power supply 300 and a sampling chip 310. The power supply 300 has a positive signal output terminal and a negative signal input terminal. The first wire 210 and the second wire 220 each have a first end and a second end. The first end of the first wire 210 corresponding to the detection chip 200 is electrically connected to the positive signal output terminal of the power supply 300. The second end of the first wire 210 corresponding to the detection chip 200 is electrically connected to the first end of the second wire 220. The second end of the second wire 220 corresponding to the detection chip 200 is electrically connected to the negative signal input terminal of the power supply 300.

[0067] The sampling chip 310 is used to obtain the total voltage value information of the first wire 210 and the second wire 220 corresponding to the detection chip 200.

[0068] Specifically, the first wire 210 and the second wire 220 are connected in series and serve as a detection resistor. The detection resistor corresponding to the detection chip 200 is connected in parallel to the monitoring circuit, enabling the sampling chip 310 to independently acquire the total voltage information corresponding to the detection resistor. Based on the detected total voltage information of the detection resistor, the operating state of the explosion-proof valve 111 corresponding to the detection resistor can be determined. The sampling chip 310 can be an AFE chip (Active Front End, function of a rectification / feedback unit). The AFE chip converts the analog signal acquired by the sensor into a digital signal through its built-in ADC (Analog-to-Digital Converter). The higher the sampling frequency of the ADC, the higher the accuracy of the converted digital signal.

[0069] In some implementations, such as Figure 5 As shown, a first current-limiting resistor 330 is provided on the wire between the first end of the first wire 210 and the positive signal output terminal of the power supply 300, and the signal acquisition terminal of the sampling chip 310 is electrically connected to the wire between the first current-limiting resistor 330 and the first end of the first wire 210.

[0070] or,

[0071] A second current-limiting resistor is provided on the wire between the second end of the second wire 220 and the negative signal output terminal of the power supply 300. The signal acquisition terminal of the sampling chip 310 is electrically connected to the wire between the second current-limiting resistor and the second end of the second wire 220.

[0072] Specifically, the first current-limiting resistor 330 and the detection resistor are connected in series to form a series circuit. The first current-limiting resistor 330 limits the current in the series circuit, preventing damage to the devices caused by excessive current. For example, the total voltage of each series circuit is U0, and the total resistance is R. The resistance of the first current-limiting resistor 330 is 5%R, and the detection resistor formed by the first wire 210 and the second wire 220 is 95%R. If the explosion-proof valve 111 corresponding to the battery cell 110 is in a normal closed state, the sampling chip 310 collects the voltage corresponding to the detection resistor as 95%U0. If the explosion-proof valve 111 corresponding to the battery cell 110 is in an open state, the voltage corresponding to the detection resistor collected by the sampling chip 310 is less than 95%U0. Specifically, if the first wire 210 and / or the second wire 220 are open, the voltage corresponding to the detection resistor collected by the sampling chip 310 is 0; if the first wire 210 and / or the second wire 220 are short-circuited, the resistance of the detection resistor decreases, and the voltage corresponding to the detection resistor collected is greater than 0 and less than 95%U0. A short circuit in the first wire 210 will cause its own resistance to decrease, a short circuit in the second wire 220 will cause its own resistance to decrease, and a short circuit connection between the first wire 210 and the second wire 220 will cause the detection resistance to decrease.

[0073] In this example, the status of the explosion-proof valve 111 of the battery cell 110 can be monitored in real time, and the two types of open circuit and short circuit caused by the explosion-proof valve 111 can be detected. The position of the battery cell 110 with the valve open can also be located.

[0074] In some implementations, such as Figure 5 As shown, the monitoring circuit also includes a processor 320. The signal output terminal of the sampling chip 310 is connected to the signal input terminal of the processor 320, and the signal output terminal of the processor 320 is electrically connected to the control terminal of the power supply 300.

[0075] Specifically, the processor 320 determines the working state of the explosion-proof valve 111 of the corresponding battery cell 110 based on the voltage information corresponding to the detection resistor collected by the sampling chip 310, and adjusts the power of the power supply 300 according to the working state of the explosion-proof valve 111 of the battery cell, so that the power supply 300 can work at different power levels.

[0076] In some embodiments, if the first wire 210 and / or the second wire 220 on the detection chip 200 are in an open state, the total voltage output by the sampling chip 310 is the first voltage value;

[0077] If the first wire 210 and / or the second wire 220 on the detection chip 200 are in a short-circuit connection state, then the total voltage output by the sampling chip 310 is the second voltage value, and the first voltage value is less than the second voltage value.

[0078] For example, the processor 320 determines the operating state of the explosion-proof valve 111 of the corresponding battery cell 110 based on the voltage information corresponding to the detection resistor collected by the sampling chip 310. If the voltage corresponding to the detection resistor collected by the sampling chip 310 is a high-level voltage (e.g., 95%U0), the explosion-proof valve 111 of the battery cell 110 is in the closed state; if the voltage corresponding to the detection resistor collected by the sampling chip 310 is a low-level voltage, the explosion-proof valve 111 of the battery cell 110 is in the open state. When the low-level voltage is a first voltage value of 0, the first wire 210 and / or the second wire 220 corresponding to the explosion-proof valve 111 are disconnected; when the low-level voltage is a second voltage value greater than 0 and less than 95%U0, the first wire 210 and / or the second wire 220 corresponding to the explosion-proof valve 111 are short-circuited.

[0079] In some embodiments, the sampling chip 310 is used to acquire the total voltage information of the first wire 210 and the second wire 220 corresponding to the detection chip 200, and send the total voltage information of the first wire 210 and the second wire 220 corresponding to the detection chip 200 to the processor 320.

[0080] The processor 320 is used to determine the working state of the explosion-proof valve 111 corresponding to the detection piece 200 based on the total voltage information of the first wire 210 and the second wire 220 corresponding to the detection piece 200. The working state of the explosion-proof valve 111 includes an open valve state and a closed valve state.

[0081] If the processor 320 determines that the explosion-proof valve 111 corresponding to any detection piece 200 is in the open state, the processor 320 controls the power supply 300 to switch from the first power to the second power, so that the first wire 210 and the second wire 220 corresponding to the remaining detection pieces 200 are heated to burn through the corresponding explosion-proof valve 111, wherein the first power is less than the second power.

[0082] Specifically, if the processor 320 determines, based on the total voltage information collected by the sampling chip 310, that the explosion-proof valves 111 corresponding to each individual cell 110 in the battery module 100 are all in a closed state, then the processor 320 controls the power supply 300 to operate at a first power level, which is low power; if the processor 320 determines, based on the total voltage information collected by the sampling chip 310, that the explosion-proof valve 111 corresponding to any individual cell 110 in the battery module 100 is in an open state, then the processor 320 controls the power supply 300 to operate at a second power level, which is high power, so that the first wire 210 and the second wire 220 on the detection piece 200 corresponding to the remaining unopened explosion-proof valves 111 heat up, causing the corresponding explosion-proof valves 111 to burn out, thereby prompting the remaining unopened explosion-proof valves 111 to actively open, reducing the hazards caused by heat diffusion.

[0083] In this example, the processor 320 controls the power supply 300 to monitor at low power. The processor 320 determines the working status of the explosion-proof valve 111 based on the total voltage information of the detection chip 200 corresponding to the cell 110 in the battery module 100 obtained by the sampling chip 310. If it is determined that the explosion-proof valve 111 corresponding to any cell 110 is open, the output power of the power supply 300 is increased, so that the monitoring circuit corresponding to the detection chip 200 switches from a low power state to a high power state, thereby causing the explosion-proof valve 111 that has not been opened to burn through. In this way, when thermal runaway occurs, the explosion-proof valves 111 of other cells 110 in the battery module 100 can be forced to open in advance, which has an emergency handling function and prevents the harm caused by thermal runaway.

[0084] The second aspect of this utility model is as follows: Figure 1 As shown, a battery module 100 is provided, including a plurality of individual battery cells 110 and a circuit detection and protection device for the battery module as described in any embodiment of this application. An explosion-proof valve 111 is provided on the individual battery cells 110, and the detection piece 200 is provided on the explosion-proof valve 111.

[0085] Specifically, the battery module 100 is formed by multiple individual battery cells 110 connected in series or parallel. Each individual battery cell 110 has an explosion-proof valve 111, and a detection plate 200 is installed on the explosion-proof valve 111. The technical features and effects of the battery module 100 provided in this application are consistent with the technical features and effects of the circuit detection and protection device for battery modules described in any embodiment of this application, and will not be repeated here.

[0086] It should be noted that the specific grooves on the explosion-proof valve 111 are shaped to match the shapes of the first wire 210 and the second wire 220 on the detection plate 200, making it easier for the first wire 210 and the second wire 220 to burn through the explosion-proof valve 111 under high-power heating, thereby further improving the safety of the battery module 100.

[0087] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the utility model involved in this application is not limited to the technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A circuit detection and protection device for a battery module, characterized in that, The application relates to a battery module monitoring circuit. The monitoring circuit comprises a plurality of detection pieces (200) corresponding to the battery monomer (110) of the battery module (100), and the detection pieces (200) are arranged on the explosion-proof valve (111) of the battery monomer (110). The detection piece (200) is connected in parallel to the monitoring circuit through the first wire (210) and the second wire (220), so that the first wire (210) or / and the second wire (220) corresponding to the explosion-proof valve (111) is disconnected or short-circuited when the explosion-proof valve (111) is blown off due to stress.

2. The circuit protection device for a battery module according to claim 1, wherein The first wire (210) and the second wire (220) are arranged in parallel, and the first wire (210) and the second wire (220) are bent and laid on the detection piece (200).

3. The circuit protection device for a battery module according to claim 1, wherein The first wire (210) and the second wire (220) are in the shape of a broken line or an arc.

4. The circuit detection guard for a battery module according to any one of claims 1 to 3, wherein The first wire (210) and the second wire (220) each comprise a plurality of first straight line segments arranged in parallel at intervals, two adjacent first straight line segments in the first wire (210) or the second wire (220) are connected by a second straight line segment between two end points on the same side, and two adjacent second straight line segments are arranged staggeredly. Alternatively, The first wire (210) and the second wire (220) each comprise a plurality of first straight line segments arranged in parallel at intervals, two adjacent first straight line segments in the first wire (210) or the second wire (220) are connected by a second straight line segment between two end points on different sides, and each second straight line segment is arranged in parallel. Alternatively, The first wire (210) and the second wire (220) each comprise a plurality of first arc-shaped segments arranged in parallel at intervals, two adjacent first arc-shaped segments in the first wire (210) or the second wire (220) are connected by a second arc-shaped segment between two end points on different sides, and each second arc-shaped segment is arranged in parallel.

5. The circuit protection device for a battery module of claim 1, wherein, The monitoring circuit further comprises a power supply (300) and a sampling chip (310), wherein the power supply (300) has a positive signal output end and a negative signal input end, the first wire (210) and the second wire (220) each have a first end and a second end, the first end of the first wire (210) corresponding to the detection piece (200) is electrically connected to the positive signal output end of the power supply (300), the second end of the first wire (210) corresponding to the detection piece (200) is electrically connected to the first end of the second wire (220), and the second end of the second wire (220) corresponding to the detection piece (200) is electrically connected to the negative signal input end of the power supply (300). The sampling chip (310) is used to acquire total voltage value information of the first lead wire (210) and the second lead wire (220) corresponding to the detection sheet (200).

6. The circuit protection device for a battery module according to claim 5, wherein A first current-limiting resistor (330) is arranged on a lead wire between a first end of the first lead wire (210) and a positive signal output end of the power supply (300), and a signal collection end of the sampling chip (310) is electrically connected to a lead wire between the first current-limiting resistor (330) and the first end of the first lead wire (210). Alternatively, A second current-limiting resistor is arranged on a lead wire between a second end of the second lead wire (220) and a negative signal output end of the power supply (300), and a signal collection end of the sampling chip (310) is electrically connected to a lead wire between the second current-limiting resistor and the second end of the second lead wire (220).

7. The circuit protection device for a battery module according to claim 5, wherein The monitoring circuit further comprises a processor (320), a signal output end of the sampling chip (310) is connected to a signal input end of the processor (320), and a signal output end of the processor (320) is electrically connected to a control end of the power supply (300).

8. The circuit detection guard for a battery module of any of claims 5-7, wherein, If the first lead wire (210) or / and the second lead wire (220) corresponding to the detection sheet (200) is in a disconnected state, a total voltage output by the sampling chip (310) is a first voltage value; If the first lead wire (210) or / and the second lead wire (220) corresponding to the detection sheet (200) is in a short-circuit connection state, a total voltage output by the sampling chip (310) is a second voltage value, and the first voltage value is less than the second voltage value.

9. The circuit protection device for a battery module of claim 7, wherein, The sampling chip (310) is used to acquire total voltage information of the first lead wire (210) and the second lead wire (220) corresponding to the detection sheet (200) and send the total voltage information of the first lead wire (210) and the second lead wire (220) corresponding to the detection sheet (200) to the processor (320). The processor (320) is used to determine a working state of an explosion-proof valve (111) corresponding to the detection sheet (200) based on the total voltage information of the first lead wire (210) and the second lead wire (220) corresponding to the detection sheet (200), and the working state of the explosion-proof valve (111) comprises an open valve state and a closed valve state. If the processor (320) determines that the explosion-proof valve (111) corresponding to any detection sheet (200) is in the open valve state, the processor (320) is used to control the power supply (300) to work under a first power and a second power, so that the first lead wire (210) and the second lead wire (220) corresponding to the remaining detection sheets (200) generate heat to burn the corresponding explosion-proof valves (111), and the first power is less than the second power.

10. A battery module, characterized by The circuit detection and protection device comprises a plurality of battery cell monomers (110) and the circuit detection and protection device for a battery module according to any one of claims 1-9, the battery cell monomer (110) is provided with an explosion-proof valve (111), and the explosion-proof valve (111) is provided with the detection sheet (200).

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