Battery connection structure, battery system, and electric vehicle

Abstract

The application provides a battery connection structure, comprising a plurality of battery units connected in series, at least one battery unit being connected in series with other battery units through a temperature switch, the temperature switch comprising a first connecting member connected with a first electrode terminal of the battery unit and a second connecting member connected with a second electrode terminal of the battery unit; at a normal working temperature, the first connecting member and the second connecting member are in a disconnected state, and the first connecting member and the second connecting member are respectively connected with the two electrode terminals of the battery unit to realize series connection of the battery; when the temperature is higher than the normal working temperature, the first connecting member and / or the second connecting member is deformed and disconnected with the corresponding electrode terminal of the battery unit, and meanwhile the first connecting member and the second connecting member are connected in conduction. The application also provides a battery system and an electric vehicle.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery connection structure, battery system and electric vehicle. Background Technology

[0002] With the application and widespread promotion of electric vehicles, batteries, as the core component of electric vehicles, have faced higher requirements for safety performance.

[0003] Battery modules typically consist of multiple cells connected in series or parallel. When one cell in a battery module experiences thermal runaway, it can spread to surrounding cells, potentially causing the battery pack to catch fire or explode. Therefore, when designing battery modules or battery packs, it is essential to fully consider measures to prevent battery thermal runaway.

[0004] Technical issues

[0005] Generally, there are three ways to prevent battery thermal runaway: 1. Add a heat-insulating and flame-retardant layer to the battery box cover; 2. Add a heat-insulating and flame-retardant layer to the battery module; 3. Add a heat-insulating and flame-retardant layer between the battery cells. All three of these measures passively prevent the spread of heat within the battery, rather than actively disconnecting the cell experiencing thermal runaway from the circuit to completely block the spread of thermal runaway.

[0006] Existing technologies also employ temperature anomaly warning or circuit disconnection designs, such as using a shape memory metal spring structure. When the battery temperature exceeds the normal operating temperature range, the deformation of the shape memory metal disconnects the circuit, preventing further thermal runaway. However, this solution only considers safety precautions. If a battery or battery pack experiences thermal runaway and forms an open circuit, the entire battery system will cease to function.

[0007] Technical solutions

[0008] The purpose of this application is to provide a battery connection structure, a battery system, and an electric vehicle, aiming to overcome the shortcomings of the aforementioned background technology. When a battery cell in the battery system experiences thermal runaway, the first connector and / or the second connector deform and disconnect from the corresponding electrode terminal of the battery cell, thereby disconnecting the thermally runaway battery cell from the circuit, completely blocking the spread of thermal runaway, and the entire battery system can continue to work, thereby greatly improving the safety and practicality of the battery system.

[0009] One embodiment of this application provides a battery connection structure, including a plurality of battery cells connected in series, at least one battery cell being connected in series with other battery cells via a temperature switch, the temperature switch including a first connector connected to a first electrode terminal of the battery cell and a second connector connected to a second electrode terminal of the battery cell;

[0010] Under normal operating temperature, the first connector and the second connector are disconnected, and the first connector and the second connector are respectively connected to the two electrode terminals of the battery cell to realize the battery series connection;

[0011] When the temperature is higher than the normal operating temperature, the first connector and / or the second connector deform and disconnect from the electrode terminal corresponding to the battery cell, while the first connector and the second connector are connected to each other.

[0012] In one possible implementation, the first connector includes a first deformable portion, and the second connector includes a second deformable portion;

[0013] Under normal operating temperature, the first deformed portion and the second deformed portion are respectively connected to the two electrode terminals of the battery cell;

[0014] When the temperature is higher than the normal operating temperature, both the first deformed part and the second deformed part deform and disconnect from the two electrode terminals of the battery cell.

[0015] In one feasible embodiment, both the first deformable portion and the second deformable portion have shape memory function;

[0016] When the temperature returns to the normal operating temperature, both the first deformed part and the second deformed part return to their pre-deformation state and are respectively connected to the two electrode terminals of the battery cell.

[0017] In one possible embodiment, the first connector further includes a first extension connected to the first deformable portion, the first extension extending toward the second deformable portion, and the second connector further includes a second extension connected to the second deformable portion, the second extension extending toward the first deformable portion.

[0018] At normal operating temperature, the second protrusion and the first protrusion are spaced apart vertically.

[0019] When the temperature is higher than the normal operating temperature, the second protrusion and the first protrusion come into contact with each other vertically.

[0020] In one feasible manner, the second protrusion has a shape memory function;

[0021] When the temperature is higher than the normal operating temperature, the second protrusion deforms and comes into contact with the first protrusion in the direction of approaching it.

[0022] When the temperature returns to the normal operating temperature, the second protrusion deforms away from the first protrusion and disconnects from it.

[0023] In one possible implementation, the plurality of battery cells include a first battery cell, a second battery cell, and a third battery cell, wherein the second battery cell is located between the first battery cell and the third battery cell, and the second battery cell is connected in series with the first battery cell and the third battery cell via the temperature switch;

[0024] Under normal operating temperature, the first deformed part is connected to the first electrode terminal of the second battery cell, and the second deformed part is connected to the second electrode terminal of the second battery cell;

[0025] When the temperature is higher than the normal operating temperature, the first deformable part deforms and disconnects from the first electrode terminal of the second battery cell, and the second deformable part deforms and disconnects from the second electrode terminal of the second battery cell.

[0026] In one possible implementation, the first connector further includes a first fixing portion connected to the first deformable portion, the first fixing portion extending toward the first battery cell, and the first fixing portion being fixedly connected to a second electrode terminal of the first battery cell; the second connector further includes a second fixing portion connected to the second deformable portion, the second fixing portion extending toward the third battery cell, and the second fixing portion being fixedly connected to a first electrode terminal of the third battery cell.

[0027] In one possible implementation, both the first connector and the second connector are integrally L-shaped.

[0028] In one possible implementation, the first deformable portion, the first protruding portion, and the first fixed portion are all in the same plane; the second deformable portion and the second fixed portion are both in the same plane, and the second protruding portion is higher than the plane in which the second deformable portion and the second fixed portion are located.

[0029] In one possible implementation, the first electrode terminal is one of the positive and negative electrodes of the battery cell, and the second electrode terminal is the other of the positive and negative electrodes of the battery cell.

[0030] In one feasible approach, the first deformable portion and the second deformable portion are made of shape memory metal or bimetallic sheet.

[0031] In one feasible manner, the temperature switch has a deformation temperature of 60°C to 150°C.

[0032] In one feasible approach, each battery cell is a single cell, a battery pack, or a battery module.

[0033] Another embodiment of this application provides a battery system including the battery connection structure described above.

[0034] Another embodiment of this application provides an electric vehicle including the battery system described above.

[0035] Beneficial effects

[0036] The battery connection structure provided in this application allows the battery cell to operate normally when the battery cell is within its normal operating temperature range. The temperature switch is below its deformation temperature, the first connector is connected to the first electrode terminal of the battery cell, and the second connector is connected to the second electrode terminal of the battery cell. The first and second connectors are disconnected, and the battery cell operates normally. When the battery cell experiences thermal runaway, its temperature exceeds the normal operating temperature range. The temperature switch reaches its deformation temperature, causing the first and / or second connectors to deform and disconnect from the corresponding electrode terminal of the battery cell. This disconnects the thermally runaway battery cell from the circuit. Simultaneously, the first and second connectors remain connected, allowing the entire battery system to continue operating.

[0037] The battery connection structure provided in this application can disconnect the thermally runaway battery cell from the circuit when a thermal runaway occurs in a battery cell in the battery system, completely blocking the spread of thermal runaway, while the entire battery system can continue to work, thereby greatly improving the safety and practicality of the battery system. Attached Figure Description

[0038] Figure 1 This is a three-dimensional structural diagram of the battery cell in an embodiment of this application.

[0039] Figure 2 This is a three-dimensional structural diagram of the battery connection structure before the first and second connectors in the embodiments of this application are deformed.

[0040] Figure 3 for Figure 2 Side view.

[0041] Figure 4 This is a three-dimensional structural diagram of the battery connection structure after the first and second connectors are deformed in the embodiments of this application.

[0042] Figure 5 for Figure 4Side view.

[0043] Figure 6 for Figure 2 A schematic diagram of the structure of the first connecting component before deformation.

[0044] Figure 7 for Figure 4 A schematic diagram of the structure after the first connecting component deforms.

[0045] Figure 8 for Figure 2 A schematic diagram of the structure of the second connector before deformation.

[0046] Figure 9 for Figure 4 A schematic diagram of the structure after the second connector in the middle has deformed.

[0047] Figure 10a This is a schematic diagram of the temperature switch in the embodiment of this application at its normal operating temperature.

[0048] Figure 10b This is a schematic diagram of the temperature switch in an embodiment of this application when the temperature is higher than the normal operating temperature.

[0049] Embodiments of the present invention

[0050] The specific embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this application, but are not intended to limit the scope of this application.

[0051] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification and claims of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0052] The directional terms such as "upper," "lower," "left," "right," "front," "back," "top," and "bottom" (if present) used in the specification and claims of this application are defined according to the position of the structures in the drawings and the relative positions of the structures, and are only for the purpose of clarity and convenience in expressing the technical solution. It should be understood that the use of directional terms should not limit the scope of protection claimed in this application.

[0053] like Figures 1 to 5 As shown, one embodiment of this application provides a battery connection structure including a plurality of battery cells 12 connected in series, each battery cell 12 having a first electrode terminal 121 and a second electrode terminal 122. At least one battery cell 12 is connected in series with other battery cells 12 via a temperature switch TS, the temperature switch TS including a first connector 2 connected to the first electrode terminal 121 of the battery cell 12 and a second connector 3 connected to the second electrode terminal 122 of the battery cell 12.

[0054] like Figure 2 , Figure 3 and Figure 10a As shown, under normal operating temperature, the first connector 2 and the second connector 3 are in a disconnected state. The first connector 2 and the second connector 3 are respectively connected to the two electrode terminals (121, 122) of the battery unit 12 to realize the battery series connection.

[0055] like Figure 4 , Figure 5 and Figure 10b As shown, when the temperature is higher than the normal operating temperature, the first connector 2 and / or the second connector 3 deform and disconnect from the electrode terminal corresponding to the battery unit 12. At the same time, the first connector 2 and the second connector 3 are connected to conduction. At this time, the battery unit 12 is disconnected from the circuit, but the entire circuit can continue to work.

[0056] Specifically, each battery unit 12 can be a single battery, a battery pack, or a battery module. The battery connection structure can be located inside the battery, battery pack, or battery module, or it can be located in a connection structure outside the battery. The first electrode terminal 121 is one of the positive and negative electrode terminals of the battery unit 12, and the second electrode terminal 122 is the other of the positive and negative electrode terminals of the battery unit 12. In this embodiment, the first connector 2 and the second connector 3 are both thin-plate-shaped connection sheet structures. Of course, in other embodiments, the first connector 2 and the second connector 3 can also have other shapes and structures, which are not limited here.

[0057] like Figure 4 and Figure 5 As shown, when the battery cell 12 is operating at high temperature or when thermal runaway occurs, causing abnormal temperature, the heat from the battery cell 12 can be quickly conducted to the temperature switch TS due to the good thermal conductivity of its electrode terminals (or tabs, battery terminals). At this time, the temperature of the temperature switch TS reaches its deformation temperature. The first connector 2 and the second connector 3 deform under the influence of internal deformation forces, disconnecting the first connector 2 and the second connector 3 from the corresponding electrode terminals 121 / 122 of the battery cell 12, thus disconnecting the battery cell 12 from the circuit. Simultaneously, the first connector 2 and the second connector 3 remain connected, allowing the entire circuit to continue operating. Figure 2 and Figure 3As shown, after a period of cooling, the temperature of the battery cell 12 returns to the normal operating temperature range, and the temperature of the temperature switch TS returns to below the deformation temperature. The first connector 2 and the second connector 3 return to their pre-deformation state and are connected to the corresponding electrode terminals 121 / 122 of the battery cell 12. The first connector 2 and the second connector 3 return to the disconnected state, so that the battery cell 12 is reconnected to the circuit and the battery system returns to normal operation.

[0058] In one embodiment, both the first connector 2 and the second connector 3 have shape memory function. When the temperature is higher than the normal operating temperature, both the first connector 2 and the second connector 3 deform and disconnect from the first electrode terminal 121 and the second electrode terminal 122 of the battery unit 12, respectively, and the first connector 2 contacts the second connector 3. When the temperature returns to the normal operating temperature, both the first connector 2 and the second connector 3 return to their state before deformation and contact the first electrode terminal 121 and the second electrode terminal 122 of the battery unit 12, respectively, and the first connector 2 and the second connector 3 return to the disconnected state.

[0059] Of course, in other embodiments, one of the first connector 2 and the second connector 3 may have shape memory function, while the other may not. For example, the first connector 2 may have shape memory function, while the second connector 3 may not. When the temperature is higher than the normal operating temperature, the first connector 2 deforms and disconnects from the first electrode terminal 121 of the battery cell 12, while the shape of the second connector 3 remains unchanged. The deformed first connector 2 then comes into contact with the second connector 3. This structure, in which only one of the connectors 2 / 3 has shape memory function, can also achieve the purpose of disconnecting the battery cell 12 from the circuit while the entire circuit can continue to operate.

[0060] In one implementation, such as Figures 6 to 9 As shown, the first connector 2 includes a first deformable portion 21, and the second connector 3 includes a second deformable portion 31. (As indicated...) Figure 2 and Figure 3 As shown, under normal operating temperature, the first deformed part 21 and the second deformed part 31 are respectively connected to the two electrode terminals (121, 122) of the battery cell 12; Figure 4 and Figure 5 As shown, when the temperature is higher than the normal operating temperature, the first deformation part 21 and the second deformation part 31 both deform and disconnect from the two electrode terminals (121, 122) of the battery unit 12 respectively.

[0061] In one embodiment, both the first deformable portion 21 and the second deformable portion 31 have shape memory function. When the temperature returns to the normal operating temperature, both the first deformable portion 21 and the second deformable portion 31 return to their pre-deformation state and are respectively connected to the two electrode terminals (121, 122) of the battery unit 12.

[0062] In one implementation, such as Figures 6 to 9 As shown, the first connector 2 further includes a first protrusion 22 connected to the first deformable portion 21, the first protrusion 22 extending toward the second deformable portion 31, and the second connector 3 further includes a second protrusion 32 connected to the second deformable portion 31, the second protrusion 32 extending toward the first deformable portion 21. Figure 2 and Figure 3 As shown, under normal operating temperature, the second protrusion 32 and the first protrusion 22 are spaced apart vertically; Figure 4 and Figure 5 As shown, when the temperature is higher than the normal operating temperature, the second protrusion 32 and the first protrusion 22 are in contact with each other vertically.

[0063] In one implementation, such as Figure 8 and Figure 9 As shown, the second protrusion 32 also has a shape memory function. Please refer to... Figure 4 , Figure 5 and Figure 9 When the temperature exceeds the normal operating temperature, the second protrusion 32 deforms in the direction closer to the first protrusion 22; please refer to... Figure 2 , Figure 3 and Figure 8 When the temperature returns to the normal operating temperature, the second protrusion 32 deforms in a direction away from the first protrusion 22 and returns to its original state before deformation. By configuring the second protrusion 32 to have a shape memory function, it is ensured that when the temperature is higher than the normal operating temperature, the second protrusion 32 is in contact with the first protrusion 22, and when the temperature returns to the normal operating temperature, the second protrusion 32 is spaced apart from the first protrusion 22, thereby realizing the connection and disconnection between the first connector 2 and the second connector 3.

[0064] Specifically, please combine Figure 4 , Figure 7 and Figure 9When the temperature exceeds the normal operating temperature, both the first deformable portion 21 and the second deformable portion 31 deform upwards (the directional terms "upper" and "lower" are used for ease of description only and do not constitute a limitation of this application), simultaneously causing the first protruding portion 22 and the second protruding portion 32 to move upwards. This disconnects the first deformable portion 21 and the second deformable portion 31 from the first electrode terminal 121 and the second electrode terminal 122 of the battery unit 12, respectively. Simultaneously, the second protruding portion 32 can deform downwards to ensure contact between the second protruding portion 32 and the first protruding portion 22. Please refer to... Figure 2 , Figure 6 and Figure 8 When the temperature returns to the normal operating temperature, the first deformable part 21 and the second deformable part 31 both deform downwards, which in turn causes the first protrusion 22 and the second protrusion 32 to move downwards, so that the first deformable part 21 and the second deformable part 31 come into contact with the first electrode terminal 121 and the second electrode terminal 122 of the battery unit 12, respectively. At the same time, the second protrusion 32 deforms upwards to ensure that the second protrusion 32 is spaced apart from the first protrusion 22.

[0065] In another embodiment, at the normal operating temperature, such as Figure 10a As shown, the first connector 2 and the second connector 3 are spaced apart from each other in the horizontal direction, and the first connector 2 and the second connector 3 are respectively connected to the two electrode terminals 121 and 122 of the battery unit 12; when the temperature is higher than the normal operating temperature, such as Figure 10b As shown, the first connector 2 and the second connector 3 deform and disconnect from the two electrode terminals 121 and 122 of the battery unit 12, respectively. At the same time, the first connector 2 and the second connector 3 approach each other in the horizontal direction and make contact and conduction.

[0066] In one implementation, such as Figures 1 to 5 As shown, the plurality of battery units 12 includes a first battery unit 12a, a second battery unit 12b and a third battery unit 12c. The second battery unit 12b is located between the first battery unit 12a and the third battery unit 12c. The second battery unit 12b is connected in series with the first battery unit 12a and the third battery unit 12c through a temperature switch TS.

[0067] When the second battery cell 12b is at normal operating temperature, the first deformable part 21 is connected to the first electrode terminal 121 of the second battery cell 12b, and the second deformable part 31 is connected to the second electrode terminal 122 of the second battery cell 12b.

[0068] When the temperature of the second battery cell 12b is higher than the normal operating temperature, the first deformation part 21 deforms and disconnects from the first electrode terminal 121 of the second battery cell 12b, and the second deformation part 31 deforms and disconnects from the second electrode terminal 122 of the second battery cell 12b.

[0069] In one embodiment, the first connector 2 further includes a first fixing portion 23 connected to the first deformable portion 21, the first fixing portion 23 extending toward the first battery cell 12a, and the first fixing portion 23 being fixedly connected to the second electrode terminal 122 of the first battery cell 12a. The second connector 3 further includes a second fixing portion 33 connected to the second deformable portion 31, the second fixing portion 33 extending toward the third battery cell 12c, and the second fixing portion 33 being fixedly connected to the first electrode terminal 121 of the third battery cell 12c.

[0070] In one embodiment, both the first connector 2 and the second connector 3 are integrally L-shaped.

[0071] In one implementation, such as Figure 6 and Figure 8 As shown, under normal operating temperature, the first deformable portion 21, the first protruding portion 22, and the first fixed portion 23 are all in the same plane. Under normal operating temperature, the second deformable portion 31 and the second fixed portion 33 are both in the same plane, and the second protruding portion 32 is higher than the plane containing the second deformable portion 31 and the second fixed portion 33.

[0072] In one embodiment, the first deformable portion 21, the second deformable portion 31, and the second protrusion 32 are made of shape memory metal or bimetallic sheet.

[0073] In one embodiment, the first deformable portion 21, the second deformable portion 31, and the second protruding portion 32 may be made of copper-aluminum-nickel alloy, copper-nickel alloy, titanium-nickel alloy, or copper-zinc alloy, etc.

[0074] In one embodiment, the deformation temperature of the temperature switch TS (including the first deformation portion 21, the second deformation portion 31, and the second extension portion 32) can be designed according to the operating temperature of the battery cell 12. For example, the deformation temperature of the temperature switch TS can be 60°C to 150°C.

[0075] In another embodiment, the deformation temperature of the temperature switch TS is 80°C to 130°C.

[0076] In another embodiment, the deformation temperature of the temperature switch TS is 100°C to 120°C.

[0077] Another embodiment of this application provides a battery system including the battery connection structure described above.

[0078] Another embodiment of this application provides an electric vehicle including the battery system described above.

[0079] The battery connection structure provided in this application embodiment allows the battery unit 12 to operate normally when the temperature switch TS is below the deformation temperature. The first connector 2 is connected to the first electrode terminal 121 of the battery unit 12, and the second connector 3 is connected to the second electrode terminal 122 of the battery unit 12. The first connector 2 and the second connector 3 are disconnected, and the battery unit 12 operates normally. When the battery unit 12 experiences thermal runaway, and its temperature exceeds the normal operating temperature range, the temperature switch TS reaches the deformation temperature. The first connector 2 and / or the second connector 3 deform and disconnect from the corresponding electrode terminals 121 / 122 of the battery unit 12, thereby disconnecting the thermally runaway battery unit 12 from the circuit. Simultaneously, the first connector 2 and the second connector 3 are connected, allowing the entire battery system to continue operating.

[0080] The battery connection structure provided in this application utilizes the shape memory function of the temperature switch TS. When a battery cell in the battery system experiences thermal runaway, it can disconnect the thermally runaway battery cell from the circuit, completely blocking the spread of thermal runaway. At the same time, the entire battery system can continue to work, thereby greatly improving the safety and practicality of the battery system.

[0081] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included 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.

[0082] Industrial applicability

[0083] The battery connection structure provided in this application allows the battery cell to operate normally when the battery cell is within its normal operating temperature range. The temperature switch is below its deformation temperature, the first connector is connected to the first electrode terminal of the battery cell, and the second connector is connected to the second electrode terminal of the battery cell. The first and second connectors are disconnected, and the battery cell operates normally. When the battery cell experiences thermal runaway, its temperature exceeds the normal operating temperature range. The temperature switch reaches its deformation temperature, causing the first and / or second connectors to deform and disconnect from the corresponding electrode terminal of the battery cell. This disconnects the thermally runaway battery cell from the circuit. Simultaneously, the first and second connectors remain connected, allowing the entire battery system to continue operating.

[0084] The battery connection structure provided in this application can disconnect the thermally runaway battery cell from the circuit when a thermal runaway occurs in a battery cell in the battery system, completely blocking the spread of thermal runaway, while the entire battery system can continue to work, thereby greatly improving the safety and practicality of the battery system.

Claims

1. A battery connection structure comprising a plurality of battery cells (12) connected in series, characterized in that, At least one battery cell (12) is connected in series with other battery cells (12) via a temperature switch (TS). The temperature switch (TS) includes a first connector (2) connected to a first electrode terminal (121) of the battery cell (12) and a second connector (3) connected to a second electrode terminal (122) of the battery cell (12). The first connector (2) and / or the second connector (3) have shape memory function. Under normal operating temperature, the first connector (2) and the second connector (3) are disconnected. The first connector (2) and the second connector (3) are respectively connected to the two electrode terminals (121, 122) of the battery unit (12) to realize battery series connection. When the temperature is higher than the normal operating temperature, the first connector (2) and / or the second connector (3) deform and disconnect from the electrode terminal corresponding to the battery cell (12), while the first connector (2) and the second connector (3) are connected in a conductive manner. When the temperature returns to the normal operating temperature, the first connector (2) and / or the second connector (3) return to their pre-deformation state and are connected to the corresponding electrode terminals (121, 122) of the battery cell (12).

2. The battery connection structure as described in claim 1, characterized in that, The first connector (2) includes a first deformable portion (21), and the second connector (3) includes a second deformable portion (31). Under normal operating temperature, the first deformable part (21) and the second deformable part (31) are respectively connected to the two electrode terminals (121, 122) of the battery cell (12); When the temperature is higher than the normal operating temperature, the first deformable part (21) and the second deformable part (31) both deform and disconnect from the two electrode terminals (121, 122) of the battery cell (12).

3. The battery connection structure as described in claim 2, characterized in that, Both the first deformable part (21) and the second deformable part (31) have shape memory function; When the temperature returns to the normal operating temperature, the first deformed part (21) and the second deformed part (31) are restored to their original state before deformation and are connected to the two electrode terminals (121, 122) of the battery unit (12), respectively.

4. The battery connection structure as described in claim 2, characterized in that, The first connector (2) further includes a first extension (22) connected to the first deformable part (21), the first extension (22) extending toward the second deformable part (31), and the second connector (3) further includes a second extension (32) connected to the second deformable part (31), the second extension (32) extending toward the first deformable part (21); At normal operating temperature, the second protrusion (32) and the first protrusion (22) are spaced apart vertically; When the temperature is higher than the normal operating temperature, the second protrusion (32) and the first protrusion (22) come into contact with each other vertically.

5. The battery connection structure as described in claim 4, characterized in that, The second protrusion (32) has shape memory function; When the temperature is higher than the normal operating temperature, the second protrusion (32) deforms and comes into contact with the first protrusion (22) in a direction closer to it; When the temperature returns to the normal operating temperature, the second extension (32) deforms away from the first extension (22) and disconnects from it.

6. The battery connection structure as described in claim 4, characterized in that, The plurality of battery cells (12) connected in series include a first battery cell (12a), a second battery cell (12b) and a third battery cell (12c). The second battery cell (12b) is located between the first battery cell (12a) and the third battery cell (12c). The second battery cell (12b) is connected in series with the first battery cell (12a) and the third battery cell (12c) through the temperature switch (TS). At normal operating temperature, the first deformable part (21) is connected to the first electrode terminal (121) of the second battery cell (12b), and the second deformable part (31) is connected to the second electrode terminal (122) of the second battery cell (12b). When the temperature is higher than the normal operating temperature, the first deformable part (21) deforms and disconnects from the first electrode terminal (121) of the second battery cell (12b), and the second deformable part (31) deforms and disconnects from the second electrode terminal (122) of the second battery cell (12b).

7. The battery connection structure as described in claim 6, characterized in that, The first connector (2) further includes a first fixing part (23) connected to the first deformable part (21), the first fixing part (23) extends toward the first battery cell (12a), and the first fixing part (23) is fixedly connected to the second electrode terminal (122) of the first battery cell (12a); the second connector (3) further includes a second fixing part (33) connected to the second deformable part (31), the second fixing part (33) extends toward the third battery cell (12c), and the second fixing part (33) is fixedly connected to the first electrode terminal (121) of the third battery cell (12c).

8. The battery connection structure as described in claim 7, characterized in that, Both the first connector (2) and the second connector (3) are in an overall "L" shape.

9. The battery connection structure as described in claim 8, characterized in that, At normal operating temperature, the first deformable part (21), the first protruding part (22) and the first fixed part (23) are in the same plane; at normal operating temperature, the second deformable part (31) and the second fixed part (33) are in the same plane, and the second protruding part (32) is higher than the plane where the second deformable part (31) and the second fixed part (33) are located.

10. The battery connection structure according to any one of claims 2-9, characterized in that, The first deformable part (21) and the second deformable part (31) are made of shape memory metal or bimetallic sheet.

11. The battery connection structure according to any one of claims 1-9, characterized in that, The temperature switch (TS) has a deformation temperature of 60℃~150℃.

12. The battery connection structure according to any one of claims 1-9, characterized in that, The temperature switch (TS) has a deformation temperature of 80℃~130℃.

13. The battery connection structure as described in claim 1, characterized in that, At normal operating temperature, the first connector (2) and the second connector (3) are spaced apart from each other in the horizontal direction; When the temperature is higher than the normal operating temperature, the first connector (2) and the second connector (3) approach each other in the horizontal direction and make contact.

14. A battery system, characterized in that, Includes the battery connection structure as described in any one of claims 1-13.

15. An electric vehicle, characterized in that, Includes the battery system as described in claim 14.

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