Battery monomer, battery device and electric device

Abstract

The utility model provides a battery monomer, a battery device and a power utilization device, the battery monomer comprises a shell, an electrode terminal assembly, an electrode assembly and a switching assembly, the electrode terminal assembly is arranged in the shell, the electrode assembly and the switching assembly are accommodated in the shell, the switching assembly comprises a first connector, a second connector and a temperature response part, the first connecting body is electrically connected with the second connecting body through the temperature response part, the first connecting body is connected to the electrode terminal, the second connecting body is connected to the electrode assembly, and the temperature response part is configured to cut off the electric connection between the first connecting body and the second connecting body when the temperature exceeds a first threshold value. When the temperature of the single battery exceeds a first threshold value, the temperature response piece cuts off the electric connection between the first connector and the second connector, so that the internal loop of the single battery is disconnected, the single battery stops charging and discharging, the possibility of heat production of the single battery is reduced, the possibility of thermal runaway of the single battery is reduced, and the service life of the battery is prolonged. The reliability of the battery monomer is improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery cell, a battery device, and an electrical device. Background Technology

[0002] Battery devices have advantages such as high specific energy and high power density, and are widely used in electronic devices and transportation vehicles, such as mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships and power tools.

[0003] As the application scope of battery devices continues to expand, the requirements for the reliability of battery devices are also increasing. How to reduce the possibility of thermal runaway of individual battery cells and improve the reliability of individual battery cells is receiving increasing attention from those skilled in the art. Utility Model Content

[0004] In view of the above problems, this application provides a battery cell, a battery device, and an electrical device, wherein the battery cell can reduce the possibility of thermal runaway and has good reliability.

[0005] In a first aspect, some embodiments of this application provide a battery cell, which includes a housing, an electrode terminal assembly, an electrode assembly, and an adapter assembly. The electrode terminal assembly is disposed in the housing, and both the electrode assembly and the adapter assembly are housed in the housing. The adapter assembly includes a first connector, a second connector, and a temperature response element. The first connector is electrically connected to the second connector via the temperature response element. The first connector is connected to the electrode terminal, and the second connector is connected to the electrode assembly. The temperature response element is configured to disconnect the electrical connection between the first connector and the second connector when the temperature exceeds a first threshold.

[0006] In the above structure, when the temperature of a battery cell exceeds a first threshold, the temperature response device cuts off the electrical connection between the first connector and the second connector, thereby breaking the internal circuit of the battery cell and stopping the charging and discharging of the battery cell. This reduces the possibility of heat generation in the battery cell, which helps to reduce the possibility of thermal runaway in the battery cell and improves the reliability of the battery cell.

[0007] According to some embodiments of the present application, the battery cell, the adapter assembly further includes a protective structure having a cavity in which at least a portion of the temperature response element is located. The protective structure reduces the possibility of electrolyte dripping onto the temperature response element, enabling the temperature response element to promptly disconnect the electrical connection between the first connector and the second connector.

[0008] According to some embodiments of this application, the battery cell includes a temperature response device including a positive temperature coefficient thermistor. At least a portion of the positive temperature coefficient thermistor is located in the cavity. The positive temperature coefficient thermistor is configured to disconnect the electrical connection between the first connector and the second connector when the temperature exceeds a first threshold. This allows the positive temperature coefficient thermistor to conduct the first connector and the second connector when the temperature is less than or equal to the first threshold, and its resistance to increase to disconnect the electrical connection between the first connector and the second connector when the temperature is greater than the first threshold.

[0009] According to some embodiments of this application, the positive temperature coefficient (PTC) thermistor includes a PTC thermistor, a first connection structure, and a second connection structure. The PTC thermistor is located in a cavity. The first connection structure passes through a protective structure to connect the PTC thermistor to a first connector. The second connection structure passes through the protective structure to connect the PTC thermistor to a second connector. By allowing both the first and second connection structures to pass through the protective structure, the first connection structure can connect the PTC thermistor located in the cavity to the first connector, and the second connection structure can connect the PTC thermistor located in the cavity to the second connector.

[0010] According to some embodiments of this application, in a battery cell, a first connecting structure and a second connecting structure are spaced apart relative to each other along the thickness direction of a positive temperature coefficient (PTC) thermistor, with the PTC thermistor sandwiched between the first and second connecting structures. By sandwiching the PTC thermistor between the first and second connecting structures, the PTC thermistor can make close contact with the first and second connecting structures under the action of clamping force, which helps to reduce the contact resistance between the PTC thermistor and the first and second connecting structures, and thus helps to reduce the resistance of the internal circuit of the battery cell.

[0011] According to some embodiments of the present application, the battery cell has a first connecting structure and a second connecting structure extending out of the protective structure in opposite directions, such that there is a large distance between the first connecting structure and the second connecting structure extending out of the protective structure. This makes it difficult for the first connecting structure and the second connecting structure to come into contact with the electrolyte at the same time, thus reducing the possibility that the first connecting structure and the second connecting structure may be directly connected.

[0012] According to some embodiments of the present application, a battery cell is provided with a first conductive adhesive structure between the first connecting structure and the positive temperature coefficient thermistor, and a second conductive adhesive structure is provided between the second connecting structure and the positive temperature coefficient thermistor. The first and second conductive adhesive structures not only ensure a firm connection between the first and second connecting structures and the positive temperature coefficient thermistor, but also ensure a stable electrical connection between the first and second connecting structures and the positive temperature coefficient thermistor after the thermistor is turned on.

[0013] According to some embodiments of this application, the battery cell includes a temperature-responsive device comprising a positive temperature coefficient (PTC) thermistor located within a cavity. A first connector passes through a protective structure and is connected to the PTC thermistor. A second connector also passes through the protective structure and is connected to the PTC thermistor. The PTC thermistor is configured to disconnect the electrical connection between the first and second connectors when the temperature exceeds a first threshold. By passing the first connector through the protective structure and the second connector through the protective structure, the first connector can extend from outside the protective structure into the cavity to connect to the PTC thermistor, and the second connector can extend from outside the protective structure into the cavity to connect to the PTC thermistor.

[0014] According to some embodiments of this application, in a battery cell, a first connector and a second connector are arranged at intervals relative to each other along the thickness direction of a positive temperature coefficient thermistor. The positive temperature coefficient thermistor is sandwiched between the first connector and the second connector, so that the positive temperature coefficient thermistor can be in close contact with the first connector and the second connector under the action of clamping force. This is beneficial to reduce the contact resistance between the positive temperature coefficient thermistor and the first connector and the second connector, and to reduce the resistance of the internal circuit of the battery cell.

[0015] According to some embodiments of this application, the battery cell includes a first connector comprising a first main body and a first connecting portion connected to each other, and a second connector comprising a second main body and a second connecting portion connected to each other. The first main body is located outside the protective structure and connected to the electrode terminals, and the first connecting portion extends into the protective structure and abuts against a positive temperature coefficient (PTC) thermistor. The second main body is located outside the protective structure and connected to the electrode assembly, and the second connecting portion extends into the protective structure and abuts against the PTC thermistor. By having the first connecting portion extend into the protective structure and abut against the PTC thermistor, and by having the second connecting portion extend into the protective structure and abut against the PTC thermistor, the first connecting portion and the second connecting portion can clamp the PTC thermistor from both sides in the thickness direction of the PTC thermistor.

[0016] According to some embodiments of this application, the battery cell includes a temperature-responsive element comprising a connector, a third connection structure, and a fourth connection structure. The connector is located within a cavity. The third connection structure is connected to an electrode terminal and extends into the cavity, while the fourth connection structure is connected to an electrode assembly and extends into the cavity. The connector is connected to one of the third and fourth connection structures and abuts against the other. The connector is configured to deform and detach from the other connection structure when the temperature exceeds a first threshold. By placing the connector within the cavity, it is protected by a protective structure, preventing electrolyte from easily contacting the connector. This reduces the possibility that the connector may be difficult to detach from the third or fourth connection structure due to electrolyte adhesion, enabling the connector to reliably disconnect the electrical connection between the first and second connectors.

[0017] Secondly, some embodiments of this application provide a battery device that includes a single battery cell provided by any of the above-described technical solutions.

[0018] Thirdly, some embodiments of this application provide an electrical device that includes the battery device provided by the above-described technical solution, the battery device being used to provide electrical energy.

[0019] The technical solutions provided by the embodiments of this disclosure have at least the following beneficial effects:

[0020] Some embodiments of this application provide a battery cell including a housing, an electrode terminal assembly, an electrode assembly, and an adapter assembly. The electrode terminal assembly is disposed within the housing, and both the electrode assembly and the adapter assembly are housed within the housing. The adapter assembly includes a first connector, a second connector, and a temperature-responsive element. The first connector is electrically connected to the second connector via the temperature-responsive element. The first connector is connected to the electrode terminals, and the second connector is connected to the electrode assembly. The temperature-responsive element is configured to disconnect the electrical connection between the first and second connectors when the temperature exceeds a first threshold. In this structure, when the temperature of the battery cell exceeds the first threshold, the temperature-responsive element disconnects the electrical connection between the first and second connectors, causing an internal circuit break in the battery cell. This stops the battery cell from charging and discharging, reducing the possibility of heat generation in the battery cell and thus reducing the possibility of thermal runaway, thereby improving the reliability of the battery cell. Attached Figure Description

[0021] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings.

[0022] Figure 1 A schematic diagram of a vehicle provided for some embodiments of this application;

[0023] Figure 2 This is a exploded view of a battery device provided in some embodiments of this application;

[0024] Figure 3 This is a split view of a battery cell provided in some embodiments of this application;

[0025] Figure 4 This is a schematic diagram of the structure of the transfer assembly in the battery cell provided in the first embodiment of this application;

[0026] Figure 5 This is a schematic diagram of the structure of the transfer assembly in the battery cell provided in the second embodiment of this application;

[0027] Figure 6 This is a schematic diagram of the structure of the transfer assembly in the battery cell provided in the third embodiment of this application;

[0028] Figure 7 Some embodiments of this application Figure 4 Sectional view at point DD;

[0029] Figure 8 For other embodiments of this application Figure 4 Sectional view at point DD;

[0030] Figure 9 for Figure 5 Sectional view at EE;

[0031] Figure 10 for Figure 6 Sectional view at FF.

[0032] In the diagram: 1. Vehicle; 2. Battery unit; 3. Controller; 4. Motor; 5. Housing; 5a. First housing section; 5b. Second housing section; 5c. Receiving space; 7. Battery cell; 8. Casing; 9. Electrode terminals; 10. Electrode assembly; 101. Electrode body; 102. Tab; 20. Adapter assembly; 201. First connector; 2011. First main body section; 2012. First connecting section; 202. Second connector; 2021. Second main body; 2022, second connecting part; 203, temperature response component; 213, positive temperature coefficient thermistor component; 2131, positive temperature coefficient thermistor; 2132, first connecting structure; 2133, second connecting structure; 2134, first conductive adhesive structure; 2135, second conductive adhesive structure; 2031, connector; 2032, third connecting structure; 2033, fourth connecting structure; 204, protective structure; 2041, cavity. Detailed Implementation

[0033] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0034] It should be noted that, unless otherwise stated, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by those skilled in the art to which the embodiments of this application pertain.

[0035] In the description of the embodiments of this application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0036] Furthermore, technical terms such as "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 technical features indicated. In the description of the embodiments of this application, "a plurality of" means two or more, unless otherwise explicitly defined.

[0037] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0038] In the description of the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0039] Currently, judging from market trends, the application of battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely used in individual battery cells such as energy storage containers or energy storage cabinets. As the application scope of battery devices continues to expand, the requirements for their reliability are also increasing.

[0040] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells connected in series, parallel, or mixed connections via a busbar.

[0041] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0042] A battery cell can be a rechargeable battery cell, which refers to a battery cell that can be recharged after being discharged to activate the active materials and continue to be used.

[0043] Battery cells can be lithium-ion cells, sodium-ion cells, sodium-lithium-ion cells, lithium metal cells, sodium metal cells, lithium-sulfur cells, magnesium-ion cells, nickel-metal hydride cells, nickel-cadmium cells, lead-acid cells, etc.

[0044] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0045] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0046] As an example, a battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries.

[0047] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0048] In some embodiments, the battery device may include one or more battery packs, which may include one or more individual battery cells. As an example, a battery pack includes a housing and one or more individual battery cells, which are housed within the housing, for example, by a fixed arrangement. As yet another example, the battery device may include multiple battery packs, which may be connected in series, parallel, or in a mixed configuration.

[0049] As an example, the enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first enclosure may be a top cover or a bottom plate.

[0050] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0051] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0052] In some embodiments, the battery device may be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0053] Battery cells generate heat during operation. This heat is typically dissipated by heat exchange components, keeping the cell temperature within a suitable range. However, when battery cells are exposed to high temperatures, or experience mechanical or electrical abuse, the heat generated during charging and discharging increases the risk of thermal runaway.

[0054] To reduce the possibility of thermal runaway in a single battery cell and improve its reliability, some embodiments of this application provide a battery cell comprising a housing, an electrode terminal assembly, an electrode assembly, and an adapter assembly. The electrode terminal assembly is disposed within the housing, and both the electrode assembly and the adapter assembly are housed within the housing. The adapter assembly includes a first connector, a second connector, and a temperature-responsive element. The first connector is electrically connected to the second connector via the temperature-responsive element. The first connector is connected to the electrode terminals, and the second connector is connected to the electrode assembly. The temperature-responsive element is configured to disconnect the electrical connection between the first and second connectors when the temperature exceeds a first threshold. In this structure, when the temperature of the battery cell exceeds the first threshold, the temperature-responsive element disconnects the electrical connection between the first and second connectors, causing an internal circuit break in the battery cell and halting charging and discharging. This reduces the possibility of heat generation in the battery cell, thereby mitigating the likelihood of thermal runaway and improving its reliability.

[0055] The battery cells described in the embodiments of this application are applicable to battery devices and electrical devices that use battery devices.

[0056] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, among others. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc.

[0057] For ease of explanation, the following embodiments will be described using a vehicle as an example of an electrical device according to an embodiment of this application.

[0058] Figure 1 The diagram shows the structural features of a vehicle provided in some embodiments of this application.

[0059] like Figure 1 As shown, a battery device 2 is installed inside the vehicle 1. The battery device 2 can be located at the bottom, front, or rear of the vehicle 1. The battery device 2 can be used to power the vehicle 1; for example, the battery device 2 can serve as the operating power source for the vehicle 1.

[0060] The vehicle 1 may also include a controller 3 and a motor 4. The controller 3 is used to control the battery device 2 to supply power to the motor 4, for example, for the power needs of the vehicle 1 during starting, navigation and driving.

[0061] In some embodiments of this application, the battery device 2 can not only serve as the operating power source for the vehicle 1, but also as the driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0062] Figure 2 This is a split view of the battery device 2 provided in some embodiments of this application. For example... Figure 2 As shown, the battery device 2 includes a housing 5 and battery cells 7, with the battery cells 7 housed within the housing 5. The battery cell 7 can be the smallest unit that makes up a battery.

[0063] The housing 5 is used to house the battery cell 7, and the housing 5 can have various structures. In some embodiments, the housing 5 may include a first housing portion 5a and a second housing portion 5b, which overlap each other, and together define a housing space 5c for housing the battery cell 7. The second housing portion 5b may be a hollow structure with one end open, and the first housing portion 5a may be a plate-like structure, with the first housing portion 5a covering the open side of the second housing portion 5b to form a housing 5 with the housing space 5c; alternatively, both the first housing portion 5a and the second housing portion 5b may be hollow structures with one side open, with the open side of the first housing portion 5a covering the open side of the second housing portion 5b to form a housing 5 with the housing space 5c. Of course, the first housing portion 5a and the second housing portion 5b can be various shapes, such as cylinders, cuboids, etc.

[0064] To improve the sealing performance after the first housing part 5a and the second housing part 5b are connected, a sealing element, such as sealant or sealing ring, can also be provided between the first housing part 5a and the second housing part 5b.

[0065] Assuming that the first box part 5a covers the top of the second box part 5b, the first box part 5a can also be called the upper box cover, and the second box part 5b can also be called the lower box 5.

[0066] In the battery device 2, there can be one or more battery cells 7. If there are multiple battery cells 7, they can be connected in series, in parallel, or in a mixed manner. A mixed connection means that multiple battery cells 7 are connected in both series and parallel. Multiple battery cells 7 can be directly connected in series, in parallel, or in a mixed manner, and then the whole assembly of multiple battery cells 7 is housed in the housing 5. Alternatively, multiple battery cells 7 can first be connected in series, in parallel, or in a mixed manner to form a battery module, and then multiple battery modules can be connected in series, in parallel, or in a mixed manner to form a whole assembly, which is then housed in the housing 5.

[0067] Some embodiments of this application provide a single battery cell, see reference. Figure 3The battery cell 7 includes a housing 8, an electrode terminal 9 assembly, an electrode assembly 10, and an adapter assembly 20. The electrode terminal 9 assembly is disposed within the housing 8, and the electrode assembly 10 and the adapter assembly 20 are both housed within the housing 8. (Refer to...) Figures 4 to 6 The adapter assembly 20 includes a first connector 201, a second connector 202, and a temperature response element 203. The first connector 201 is electrically connected to the second connector 202 via the temperature response element 203. The first connector 201 is connected to the electrode terminal 9, and the second connector 202 is connected to the electrode assembly 10. The temperature response element 203 is configured to disconnect the electrical connection between the first connector 201 and the second connector 202 when the temperature exceeds a first threshold. In this structure, when the temperature of the battery cell 7 exceeds the first threshold, the temperature response element 203 disconnects the electrical connection between the first connector 201 and the second connector 202, causing the internal circuit of the battery cell 7 to be open, thus stopping the charging and discharging of the battery cell 7. This reduces the possibility of heat generation in the battery cell 7, which helps to reduce the possibility of thermal runaway in the battery cell 7 and improves the reliability of the battery cell 7.

[0068] The outer casing 8 can be a component in the battery cell 7 used to form a sealed space, which is used to house other components in the battery cell 7 and the electrolyte.

[0069] Electrode terminals 9 are components in the battery cell 7 used for connection with external electrical devices or charging devices, enabling the external charging device to charge the battery cell 7 or the battery cell 7 to supply electrical energy to the external electrical device. By being disposed on the housing 8, the electrode terminals 9 can withstand a certain force, allowing the first and second electrode terminals 9 to provide sufficient connection force for a stable connection with the external electrical device or charging device. The electrode terminals 9 are disposed in the housing 8, with some electrode terminals 9 located inside the housing 8 and others extending outside the housing 8. The portion of the electrode terminals 9 located inside the housing 8 connects to the adapter assembly 20, while the portion outside the housing 8 can connect to the electrical device or charging device.

[0070] Electrode assembly 10 is the component in the battery cell 7 where the electrochemical reaction occurs. One or more electrode assemblies 10 can be housed within the casing 8. Electrode assembly 10 may include an electrode body 101 and tabs 102, which are the two main parts of the electrode assembly 10. Tabs 102 extend from the end of the electrode body 101 facing the wall and are used for electrical connection with electrode terminals 9. Tabs 102 can lead current out of or into the electrode assembly 10. Electrode body 101 may include a positive electrode, a negative electrode, and a separator. The positive and negative electrodes can serve as the positive and negative electrodes, respectively. During the charging and discharging process of the battery cell 7, active ions (e.g., lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator is stacked between the positive and negative electrodes to isolate them, preventing short circuits while allowing active ions to pass through.

[0071] The adapter assembly may be a component inside the battery cell 7 used to connect the tab 102 to the electrode terminal 9 to achieve an electrical connection between the electrode assembly 10 and the electrode terminal 9, so that current can flow between the electrode assembly 10 and the electrode terminal 9.

[0072] The first connector 201 may be a component in the adapter assembly 20 used for connecting to the electrode terminal 9. The first connector 201 may be bonded to the electrode terminal 9 with conductive adhesive, making it easy to connect the electrode terminal 9 to the first connector 201; the first connector 201 may also be soldered to the electrode terminal 9, so that the materials of the electrode terminal 9 and the first connector 201 are fused together, resulting in a small contact resistance between the electrode terminal 9 and the first connector 201.

[0073] The second connector 202 can be a component in the adapter assembly 20 used for connecting to the electrode assembly 10. The second connector 202 can be bonded to the tab 102 of the electrode assembly 10 using conductive adhesive, making it easy to connect the electrode assembly 10 and the second connector 202; the second connector 202 can also be soldered to the electrode assembly 10, so that the materials of the electrode assembly 10 and the second connector 202 are fused together, resulting in a smaller contact resistance between the electrode assembly 10 and the second connector 202.

[0074] The temperature response element 203 can be a component used to electrically connect the first connector 201 and the second connector 202. The temperature response element 203 can respond differently at different temperatures. When the temperature is less than or equal to a first threshold, the temperature response element 203 can conduct the electrical connection between the first connector 201 and the second connector 202, so that the internal circuit of the battery cell 7 is open and the battery cell 7 can charge and discharge normally. When the temperature exceeds the first threshold, the temperature response element 203 can disconnect the electrical connection between the first connector 201 and the second connector 202, so that the internal circuit of the battery cell 7 is disconnected and the battery cell 7 stops charging and discharging, reducing the possibility of the battery cell 7 continuing to generate heat.

[0075] Those skilled in the art can set the value of the first threshold according to actual conditions. When the temperature of the battery cell 7 reaches the first threshold, the battery cell 7 does not experience thermal runaway, but the temperature of the battery cell 7 under normal charging and discharging conditions will not reach the first threshold. For example, the range of the first threshold can be set to 80°C to 300°C, so that when the temperature of the battery cell 7 reaches the first threshold, the battery cell 7 does not experience thermal runaway, and the temperature of the battery cell 7 under normal operating conditions is not likely to reach the first threshold. In some embodiments, the range of the first threshold can be set to 80°C to 110°C, and those skilled in the art can set the value of the first threshold according to actual conditions.

[0076] In the above structure, when the temperature of the battery cell 7 exceeds the first threshold, the temperature response device 203 cuts off the electrical connection between the first connector 201 and the second connector 202, thereby breaking the internal circuit of the battery cell 7 and stopping the charging and discharging of the battery cell 7. This reduces the possibility of heat generation in the battery cell 7, which helps to reduce the possibility of thermal runaway in the battery cell 7 and improves the reliability of the battery cell 7.

[0077] In some embodiments, reference 4 to Figure 7 The adapter assembly 20 also includes a protective structure 204, which has a cavity 2041 in which at least a portion of the temperature response element 203 is located.

[0078] Since the temperature response element 203 is located in the housing 8, the electrolyte in the housing 8 may fall onto the temperature response element 203. When the temperature response element 203 cuts off the electrical connection between the first connector 201 and the second connector 202, the electrolyte can still conduct the first connector 201 and the second connector 202, so that the internal circuit of the battery cell 7 cannot be disconnected in time.

[0079] The protective structure 204 can be an insulating structure used to protect the temperature response element 203, which reduces the possibility of electrolyte falling onto the temperature response element 203, so that the temperature response element 203 can disconnect the electrical connection between the first connector 201 and the second connector 202 in a timely manner.

[0080] The cavity 2041 may be a cavity formed in the protective structure 204 for accommodating at least a portion of the temperature response element 203. Exemplarily, the cavity 2041 may be a sealed space enclosed by the protective structure 204, so that the electrolyte in the battery cell 7 does not easily fall onto the temperature response element 203 located in the cavity 2041.

[0081] At least a portion of the temperature response element 203 is located in the cavity 2041. This can be achieved by having a portion of the temperature response element 203 located in the cavity 2041 and another portion of the temperature response element 203 extending to the outside of the protective structure 204; or by having the entire temperature response element 203 completely located in the cavity 2041. Those skilled in the art can configure the cavity 2041 in which the temperature response element 203 is located according to the actual situation so that the protective structure 204 can reduce the possibility of electrolyte falling onto the temperature response element 203.

[0082] By placing at least a portion of the temperature response element 203 in the cavity 2041 of the protective structure 204, the electrolyte in the battery cell 7 is less likely to come into contact with the temperature response element 203, reducing the possibility that the electrolyte will directly connect the first connector 201 and the second connector 202, and enabling the temperature response element 203 to cut off the electrical connection between the first connector 201 and the second connector 202 in a timely manner.

[0083] In some embodiments, reference Figure 7 The temperature response element 203 includes a positive temperature coefficient thermistor element 213, at least a portion of which is located in the cavity 2041. The positive temperature coefficient thermistor element 213 is configured to disconnect the electrical connection between the first connector 201 and the second connector 202 when the temperature exceeds a first threshold.

[0084] The positive temperature coefficient thermistor 213 can be a sensor device whose resistance increases with increasing temperature. By including the positive temperature coefficient thermistor 213 in the temperature response element 203, the resistance of the temperature response element 203 increases with increasing temperature, thereby breaking the circuit between the first connector 201 and the second connector 202. The positive temperature coefficient thermistor 213 is configured to disconnect the electrical connection between the first connector 201 and the second connector 202 when the temperature exceeds a first threshold. This means that when the temperature is less than or equal to the first threshold, the positive temperature coefficient thermistor 213 can conduct the first connector 201 and the second connector 202; when the temperature is greater than the first threshold, the resistance of the positive temperature coefficient thermistor 213 can increase to the point of disconnecting the electrical connection between the first connector 201 and the second connector 202.

[0085] For example, when the temperature is less than or equal to the first threshold, the resistance of the positive temperature coefficient thermistor 213 is less than or equal to 0.1 mΩ, and the positive temperature coefficient thermistor 213 exhibits conductive properties, connecting the first connector 201 and the second connector 202, thus ensuring normal conduction of the internal circuit of the battery cell 7. When the temperature exceeds the first threshold, the resistance of the positive temperature coefficient thermistor 213 increases to 10000 Ω or more, and the positive temperature coefficient thermistor 213 exhibits insulating properties, cutting off the electrical connection between the first connector 201 and the second connector 202, thus disconnecting the internal circuit of the battery cell 7. When the temperature drops back to the first threshold or lower (the temperature of the battery cell 7 returns to normal), the resistance of the positive temperature coefficient thermistor 213 returns to a state of less than or equal to 0.1 mΩ, and the positive temperature coefficient thermistor 213 exhibits conductive properties, connecting the first connector 201 and the second connector 202, thus ensuring normal conduction of the internal circuit of the battery cell 7.

[0086] In some embodiments, the positive temperature coefficient thermistor 213 includes a positive temperature coefficient thermistor 2131, a first connection structure 2132, and a second connection structure 2133. The positive temperature coefficient thermistor 2131 is located in the cavity 2041. The first connection structure 2132 passes through the protective structure 204 to connect the positive temperature coefficient thermistor 2131 to the first connector 201. The second connection structure 2133 passes through the protective structure 204 to connect the positive temperature coefficient thermistor 2131 to the second connector 202.

[0087] The positive temperature coefficient thermistor 2131 is a sensor resistor in the positive temperature coefficient thermistor 213 whose resistance value increases with increasing temperature. This resistor can be sintered from metal elements such as manganese, cobalt, and nickel. When the temperature is less than or equal to a first threshold, the resistance value of this resistor is less than or equal to 0.1mΩ. When the temperature rises to exceed the first threshold, the resistance value of this resistor increases to 10000Ω or more.

[0088] The first connection structure 2132 can be a structure in the positive temperature coefficient thermistor 213 used to electrically connect the positive temperature coefficient thermistor 2131 to the first connector 201. The second connection structure 2133 can be a structure in the positive temperature coefficient thermistor 213 used to electrically connect the positive temperature coefficient thermistor 2131 to the second connector 202.

[0089] By placing the positive temperature coefficient thermistor 2131 in the cavity 2041, the electrolyte is less likely to come into contact with the positive temperature coefficient thermistor 2131, thereby reducing the possibility that the electrolyte will conduct the positive temperature coefficient thermistor 2131.

[0090] By allowing the first connecting structure 2132 to pass through the protective structure 204 and the second connecting structure 2133 to pass through the protective structure 204, the first connecting structure 2132 can connect the positive temperature coefficient thermistor 2131 located in the cavity 2041 to the first connector 201, and the second connecting structure 2133 can connect the positive temperature coefficient thermistor 2131 located in the cavity 2041 to the second connector 202.

[0091] For example, the protective structure 204 can be formed by injection molding to cover the positive temperature coefficient thermistor 2131, a portion of the first connection structure 2132 and a portion of the second connection structure 2133.

[0092] In some embodiments, the first connection structure 2132 and the second connection structure 2133 are arranged at intervals relative to each other along the thickness direction of the positive temperature coefficient thermistor 2131, and the positive temperature coefficient thermistor 2131 is sandwiched between the first connection structure 2132 and the second connection structure 2133.

[0093] The first connection structure 2132 and the second connection structure 2133 are arranged relatively at intervals along the thickness direction of the positive temperature coefficient thermistor 2131, so that space can be left between the first connection structure 2132 and the second connection structure 2133 for setting the positive temperature coefficient thermistor 2131.

[0094] By clamping the positive temperature coefficient thermistor 2131 between the first connection structure 2132 and the second connection structure 2133, the positive temperature coefficient thermistor 2131 can make close contact with the first connection structure 2132 and the second connection structure 2133 under the action of clamping force. This helps to reduce the contact resistance between the positive temperature coefficient thermistor 2131 and the first connection structure 2132 and the second connection structure 2133, and helps to reduce the resistance of the internal circuit of the battery cell 7.

[0095] In some embodiments, the first connecting structure 2132 and the second connecting structure 2133 extend out of the protective structure 204 in opposite directions.

[0096] The first connecting structure 2132 and the second connecting structure 2133 extending out of the protective structure 204 in opposite directions can mean that the first connecting structure 2132 and the second connecting structure 2133 extend out of the protective structure 204 in mutually opposing directions so as to connect with the first connector 201 and the second connector 202 respectively.

[0097] By making the first connecting structure 2132 and the second connecting structure 2133 extend out of the protective structure 204 in opposite directions, a large distance is made between the first connecting structure 2132 and the second connecting structure 2133 extending out of the protective structure 204. The first connecting structure 2132 and the second connecting structure 2133 are less likely to come into contact with the electrolyte at the same time, thus reducing the possibility that the first connecting structure 2132 and the second connecting structure 2133 may be directly connected.

[0098] In some embodiments, reference Figure 8 A first conductive adhesive structure 2134 is provided between the first connecting structure 2132 and the positive temperature coefficient thermistor 2131, and a second conductive adhesive structure 2135 is provided between the second connecting structure 2133 and the positive temperature coefficient thermistor 2131.

[0099] The first conductive adhesive structure 2134 can be a conductive adhesive structure. The first conductive adhesive structure 2134 can be formed by curing a conductive adhesive structure coated on the surface of the positive temperature coefficient thermistor 2131 facing the first connecting structure 2132. The first conductive adhesive structure 2134 not only ensures a firm connection between the first connecting structure 2132 and the positive temperature coefficient thermistor 2131, but also ensures a stable electrical connection between the first connecting structure 2132 and the positive temperature coefficient thermistor 2131 after the thermistor 2131 is turned on.

[0100] The second conductive adhesive structure 2135 can be a conductive adhesive structure. The second conductive adhesive structure 2135 can be formed by curing a conductive adhesive structure coated on the surface of the positive temperature coefficient thermistor 2131 facing the second connecting structure 2133. The second conductive adhesive structure 2135 not only ensures a firm connection between the second connecting structure 2133 and the positive temperature coefficient thermistor 2131, but also ensures a stable electrical connection between the second connecting structure 2133 and the positive temperature coefficient thermistor 2131 after the thermistor 2131 is turned on.

[0101] In some embodiments, the temperature response element 203 includes a positive temperature coefficient thermistor 2131 located in a cavity 2041. A first connector 201 passes through a protective structure 204 and is connected to the positive temperature coefficient thermistor 2131. A second connector 202 passes through the protective structure 204 and is connected to the positive temperature coefficient thermistor 2131. The positive temperature coefficient thermistor 2131 is configured to disconnect the electrical connection between the first connector 201 and the second connector 202 when the temperature exceeds a first threshold.

[0102] In this embodiment, the temperature response element 203 includes a positive temperature coefficient thermistor 2131. This means that the temperature response element 203 only includes the positive temperature coefficient thermistor 2131, and no longer includes the first connection structure 2132 and the second connection structure 2133 as exemplified in the aforementioned technical solutions.

[0103] By placing the positive temperature coefficient thermistor 2131 in the cavity 2041, the positive temperature coefficient thermistor 2131 is protected by the protective structure 204, making it difficult for the electrolyte to come into contact with the positive temperature coefficient thermistor 2131, thereby reducing the possibility of the electrolyte turning on the positive temperature coefficient thermistor 2131.

[0104] By passing the first connector 201 through the protective structure 204 and the second connector 202 through the protective structure 204, the first connector 201 can extend from the outside of the protective structure 204 into the cavity 2041 and connect to the positive temperature coefficient thermistor 2131, and the second connector 202 can extend from the outside of the protective structure 204 into the cavity 2041 and connect to the positive temperature coefficient thermistor 2131.

[0105] The positive temperature coefficient thermistor 2131 is configured to disconnect the electrical connection between the first connector 201 and the second connector 202 when the temperature exceeds a first threshold. Specifically, when the temperature is less than or equal to the first threshold, the resistance of the positive temperature coefficient thermistor 2131 is low, exhibiting conductive characteristics, and it can conduct the first connector 201 and the second connector 202. When the temperature exceeds the first threshold, the resistance of the positive temperature coefficient thermistor 2131 increases, exhibiting insulating characteristics, and it can disconnect the electrical connection between the first connector 201 and the second connector 202, thus cutting off the internal circuit of the battery cell 7.

[0106] In some embodiments, the first connector 201 and the second connector 202 are arranged at intervals relative to each other along the thickness direction of the positive temperature coefficient thermistor 2131, and the positive temperature coefficient thermistor 2131 is sandwiched between the first connector 201 and the second connector 202.

[0107] The first connector 201 and the second connector 202 are arranged at a relative interval along the thickness direction of the positive temperature coefficient thermistor 2131, so that a gap for setting the positive temperature coefficient thermistor 2131 can be formed between the first connector 201 and the second connector 202.

[0108] By clamping the positive temperature coefficient thermistor 2131 between the first connector 201 and the second connector 202, the positive temperature coefficient thermistor 2131 can be in close contact with the first connector 201 and the second connector 202 under the action of clamping force. This helps to reduce the contact resistance between the positive temperature coefficient thermistor 2131 and the first connector 201 and the second connector 202, and helps to reduce the resistance of the internal circuit of the battery cell 7.

[0109] In some embodiments, reference Figure 9 The first connector 201 includes a first main body 2011 and a first connecting part 2012 connected to each other. The second connector 202 includes a second main body 2021 and a second connecting part 2022 connected to each other. The first main body 2011 is located outside the protective structure 204 and connected to the electrode terminal 9. The first connecting part 2012 extends into the protective structure 204 and abuts against the positive temperature coefficient thermistor 2131. The second main body 2021 is located outside the protective structure 204 and connected to the electrode assembly 10. The second connecting part 2022 extends into the protective structure 204 and abuts against the positive temperature coefficient thermistor 2131.

[0110] The first main body 2011 and the first connecting part 2012 can be two interconnected parts of the first connector 201. The first main body 2011 is located outside the protective structure 204 and is used to connect with the electrode terminal 9, so that the first connector 201 can be easily connected with the electrode terminal 9. The second main body 2021 and the second connecting part 2022 can be two interconnected parts of the second connector 202. The second main body 2021 is located outside the protective structure 204 and is used to connect with the electrode assembly 10, so that the second connector 202 can be easily connected with the electrode assembly 10.

[0111] The first connecting portion 2012 is the part of the first connecting body 201 that extends into the protective structure 204, and it is used to abut against the positive temperature coefficient thermistor 2131. The second connecting portion 2022 is the part of the second connecting body 202 that extends into the protective structure 204, and it is used to abut against the positive temperature coefficient thermistor 2131.

[0112] By extending the first connecting portion 2012 into the protective structure 204 and abutting against the positive temperature coefficient thermistor 2131, and by extending the second connecting portion 2022 into the protective structure 204 and abutting against the positive temperature coefficient thermistor 2131, the first connecting portion 2012 and the second connecting portion 2022 can clamp the positive temperature coefficient thermistor 2131 from both sides in the thickness direction of the positive temperature coefficient thermistor 2131.

[0113] For example, the protective structure 204 can be formed by injection molding to cover the positive temperature coefficient thermistor 2131, the first connection portion 2012 and the second connection portion 2022.

[0114] In some embodiments, reference Figure 10 The temperature-responsive element 203 includes a connector 2031, a third connecting structure 2032, and a fourth connecting structure 2033. The connector 2031 is located in the cavity 2041. The third connecting structure 2032 is connected to the protective structure 204 and extends into the cavity 2041. The fourth connecting structure 2033 is connected to the protective structure 204 and extends into the cavity 2041. The connector 2031 is connected to one of the third connecting structure 2032 and the fourth connecting structure 2033 and abuts against the other of the third connecting structure 2032 and the fourth connecting structure 2033. The connector 2031 is configured to deform and detach from the other of the third connecting structure 2032 and the fourth connecting structure 2033 when the temperature exceeds a first threshold.

[0115] The third connection structure 2032 can be a structure for connecting to the electrode terminal 9. It is connected to the protective structure 204 and partially extends into the cavity 2041. This structure not only allows the third connection structure 2032 to connect to the connector 2031 located in the cavity 2041, but also allows the third connection structure 2032 to be fixed on the protective structure 204, so that the connector 2031 can obtain good support when connected to the third connection structure 2032.

[0116] The fourth connection structure 2033 can be a structure for connecting to the electrode assembly 10. It is connected to the protective structure 204 and partially extends into the cavity 2041. This structure not only allows the fourth connection structure 2033 to connect to the connector 2031 located in the cavity 2041, but also allows the fourth connection structure 2033 to be fixed on the protective structure 204, so that the connector 2031 can obtain good support when connected to the fourth connection structure 2033.

[0117] The connector 2031 can be a component in the temperature-responsive element 203 that connects the third connecting structure 2032 and the fourth connecting structure 2033. By placing the connector 2031 in the cavity 2041, the connector 2031 is protected by the protective structure 204, making it difficult for the electrolyte to come into contact with the connector 2031. This reduces the possibility that the connector 2031 may not be able to detach from the third connecting structure 2032 or the fourth connecting structure 2033 due to electrolyte adhesion, allowing the connector 2031 to reliably disconnect the electrical connection between the first connector 201 and the second connector 202.

[0118] The connector 2031 is connected to one of the third connecting structure 2032 and the fourth connecting structure 2033, so that the connector 2031 can be supported by and connected to one of the third connecting structure 2032 and the fourth connecting structure 2033, so that the connector 2031 can be deformed to resist or disengage from the other of the third connecting structure 2032 and the fourth connecting structure 2033.

[0119] The connector 2031 is connected to one of the third connecting structure 2032 and the fourth connecting structure 2033, and abuts against the other of the third connecting structure 2032 and the fourth connecting structure 2033. The connector 2031 is configured to deform and detach from the other of the third connecting structure 2032 and the fourth connecting structure 2033 when the temperature exceeds a first threshold. Alternatively, the connector 2031 may be connected to the third connecting structure 2032 and abut against the fourth connecting structure 2033, and the connector 2031 may be configured to deform and detach from the fourth connecting structure 2033 when the temperature exceeds the first threshold. Alternatively, the connector 2031 can be connected to the fourth connection structure 2033 and abut against the third connection structure 2032. The connector 2031 is configured to deform and detach from the third connection structure 2032 when the temperature exceeds a first threshold, thereby disconnecting the electrical connection between the third connection structure 2032 and the fourth connection structure 2033, and thus disconnecting the electrical connection between the first connector 201 and the second connector 202.

[0120] For example, the connector 2031 can be a bimetallic strip or similar shape memory metal, which has a small resistance value, generally less than or equal to 0.01mΩ. When the temperature of the connector 2031 is less than or equal to the first threshold, the connector 2031 maintains its shape and connects the third connection structure 2032 and the fourth connection structure 2033; when the temperature exceeds the first threshold, the connector 2031 deforms, severing the connection between the third connection structure 2032 and the fourth connection structure 2033, thus cutting off the internal circuit of the battery cell 7.

[0121] The connector 2031 can be a component made by laminating two metal layers with different coefficients of thermal expansion. Its core characteristic is that it bends due to the difference in expansion between the two metals when the temperature changes. Generally, the metal with the high coefficient of expansion can be brass or nickel alloy, and the metal with the low coefficient of expansion can be iron or steel. For example, the two metal layers with different coefficients of thermal expansion can be tightly bonded by welding or rolling.

[0122] Some embodiments of this application also provide a battery device 2, which includes the battery cell 7 provided by the above-described technical solution.

[0123] Some embodiments of this application also provide an electrical device, which includes the battery device 2 provided by the above-described technical solution, and the battery device 2 is used to provide electrical energy.

[0124] Some embodiments of this application provide a battery cell 7, which includes a housing 8, an electrode terminal 9 assembly, an electrode assembly 10, and an adapter assembly 20. The electrode terminal 9 assembly is disposed in the housing 8, and the electrode assembly 10 and the adapter assembly 20 are both housed in the housing 8. The adapter assembly 20 includes a first connector 201, a second connector 202, and a temperature response element 203. The first connector 201 is electrically connected to the second connector 202 through the temperature response element 203. The first connector 201 is connected to the electrode terminal 9, and the second connector 202 is connected to the electrode assembly 10. The temperature response element 203 is configured to disconnect the electrical connection between the first connector 201 and the second connector 202 when the temperature exceeds a first threshold. The positive temperature coefficient thermistor 213 includes a positive temperature coefficient thermistor 2131, a first connection structure 2132, and a second connection structure 2133. The positive temperature coefficient thermistor 2131 is located in the cavity 2041. The first connection structure 2132 passes through the protective structure 204 to connect the positive temperature coefficient thermistor 2131 to the first connector 201. The second connection structure 2133 passes through the protective structure 204 to connect the positive temperature coefficient thermistor 2131 to the second connector 202.

[0125] In the above structure, when the temperature of the battery cell 7 exceeds the first threshold, the temperature response device 203 cuts off the electrical connection between the first connector 201 and the second connector 202, thereby breaking the internal circuit of the battery cell 7 and stopping the charging and discharging of the battery cell 7. This reduces the possibility of heat generation in the battery cell 7, which helps to reduce the possibility of thermal runaway in the battery cell 7 and improves the reliability of the battery cell 7.

[0126] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not 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. These 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, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, include: shell; Electrode terminals are disposed on the housing; Electrode assembly, housed within the housing; An adapter assembly, housed within the housing, includes a first connector, a second connector, and a temperature responder. The first connector is electrically connected to the second connector via the temperature responder. The first connector is connected to the electrode terminal, and the second connector is connected to the electrode assembly. The temperature responder is configured to disconnect the electrical connection between the first connector and the second connector when the temperature exceeds a first threshold.

2. The battery cell according to claim 1, characterized in that, The adapter assembly further includes a protective structure having a cavity in which at least a portion of the temperature-responsive element is located.

3. The battery cell according to claim 2, characterized in that, The temperature response element includes a positive temperature coefficient thermistor, at least a portion of which is located in the cavity. The positive temperature coefficient thermistor is configured to disconnect the electrical connection between the first connector and the second connector when the temperature exceeds the first threshold.

4. The battery cell according to claim 3, characterized in that, The positive temperature coefficient thermistor includes a positive temperature coefficient thermistor, a first connection structure, and a second connection structure. The positive temperature coefficient thermistor is located in the cavity. The first connection structure passes through the protective structure to connect the positive temperature coefficient thermistor to the first connector. The second connection structure passes through the protective structure to connect the positive temperature coefficient thermistor to the second connector.

5. The battery cell according to claim 4, characterized in that, The first connection structure and the second connection structure are arranged at intervals relative to each other along the thickness direction of the positive temperature coefficient thermistor, and the positive temperature coefficient thermistor is sandwiched between the first connection structure and the second connection structure.

6. The battery cell according to claim 4 or 5, characterized in that, The first connecting structure and the second connecting structure extend out of the protective structure in opposite directions.

7. The battery cell according to any one of claims 4 to 6, characterized in that, A first conductive adhesive structure is provided between the first connecting structure and the positive temperature coefficient thermistor, and a second conductive adhesive structure is provided between the second connecting structure and the positive temperature coefficient thermistor.

8. The battery cell according to claim 2, characterized in that, The temperature response device includes a positive temperature coefficient thermistor located in the cavity. A first connector passes through the protective structure and is connected to the positive temperature coefficient thermistor. A second connector passes through the protective structure and is connected to the positive temperature coefficient thermistor. The positive temperature coefficient thermistor is configured to disconnect the electrical connection between the first connector and the second connector when the temperature exceeds the first threshold.

9. The battery cell according to claim 8, characterized in that, The first connector and the second connector are arranged at intervals relative to each other along the thickness direction of the positive temperature coefficient thermistor, and the positive temperature coefficient thermistor is sandwiched between the first connector and the second connector.

10. The battery cell according to claim 9, characterized in that, The first connector includes a first main body and a first connecting part that are connected to each other. The second connector includes a second main body and a second connecting part that are connected to each other. The first main body is located outside the protective structure and connected to the electrode terminal. The first connecting part extends into the protective structure and abuts against the positive temperature coefficient thermistor. The second main body is located outside the protective structure and connected to the electrode assembly. The second connecting part extends into the protective structure and abuts against the positive temperature coefficient thermistor.

11. The battery cell according to claim 2, characterized in that, The temperature-responsive element includes a connector, a third connection structure, and a fourth connection structure. The connector is located in the cavity. The third connection structure is connected to the electrode terminal and extends into the cavity. The fourth connection structure is connected to the electrode assembly and extends into the cavity. The connector is connected to one of the third and fourth connection structures and abuts against the other of the third and fourth connection structures. The connector is configured to deform and detach from the other of the third and fourth connection structures when the temperature exceeds the first threshold.

12. A battery device, characterized in that, Includes the battery cell as described in any one of claims 1 to 11.

13. An electrical appliance, characterized in that, Includes the battery device as described in claim 12, the battery device being used to provide electrical energy.

Images