Battery monomer, battery and electric equipment

Abstract

The utility model discloses a battery monomer, a battery and electric equipment. The battery monomer comprises a shell, an electrode terminal, an electrode assembly, an insulating part, an adapter and a heat-resistant part, the housing has a first wall. The electrode terminal is mounted on the first wall in an insulating manner. The electrode assembly is accommodated in the housing, and the electrode assembly is provided with a tab. The insulator is disposed between the first wall and the electrode assembly. The adapter is electrically connected with the tab and the electrode terminal. The heat resistant member is disposed between the first wall and the insulating member. The heat-resistant part is made of an insulating material, and the melting point of the heat-resistant part is higher than that of the insulating part. In the thickness direction of the first wall, the projection of the heat-resistant part covers the projection of the adapter part. Therefore, when the insulating part is heated and melted due to thermal runaway of the battery monomer, the heat-resistant part can still exist on the first wall so as to play an insulating role between the first wall and the electrode assembly of the battery monomer, which is beneficial for limiting further temperature rise of the battery monomer and improving the reliability of the battery monomer.

Description

Technical Field

[0001] The present application relates to the field of batteries, and in particular to a battery cell, a battery and an electrical device. Background Art

[0002] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages in energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in their development.

[0003] In the development of battery technology, in addition to improving battery performance, the reliability of batteries during use is also an issue that needs to be considered.

[0004] Therefore, how to improve battery reliability is an urgent problem to be solved in battery technology. Utility Model Content

[0005] In view of the above problems, the embodiments of the present application provide a battery cell, a battery and an electrical device, which can improve the reliability of the battery during use.

[0006] In a first aspect, an embodiment of the present application provides a battery cell, comprising a shell, an electrode terminal, an electrode assembly, an insulating member, a adapter, and a heat-resistant member. The shell has a first wall. The electrode terminal is insulated and mounted on the first wall. The electrode assembly is accommodated in the shell, and the electrode assembly has a pole ear. The insulating member is arranged between the first wall and the electrode assembly. The adapter electrically connects the pole ear and the electrode terminal. The heat-resistant member is arranged between the first wall and the insulating member. The heat-resistant member is made of an insulating material, and the melting point of the heat-resistant member is higher than the melting point of the insulating member. Along the thickness direction of the first wall, the projection of the heat-resistant member covers the projection of the adapter.

[0007] In the technical solution of the embodiment of the present application, the heat-resistant part is made of an insulating material, and the melting point of the heat-resistant part is higher than that of the insulating part. When the insulating part is melted due to thermal runaway of the battery cell, the heat-resistant part can still exist on the first wall to serve as an insulator between the first wall and the electrode assembly of the battery cell. This is beneficial to limiting the further increase in the temperature of the battery cell and improving the reliability of the battery cell.

[0008] In some embodiments, the melting point of the heat-resistant member is greater than 200° C. Such a design allows the heat-resistant member to simultaneously perform heat-resistant and insulating functions when the insulating member melts due to thermal runaway of the battery cell, which is beneficial for limiting the abutment of the first wall with the electrode assembly, thereby limiting the short circuit of the battery cell due to thermal runaway.

[0009] In some embodiments, the first wall has a first surface facing the insulating member, and the heat-resistant member is a heat-resistant coating covering at least a portion of the first surface. At least a portion of the first surface is covered by the heat-resistant coating to reduce the size of the heat-resistant member in the thickness direction of the first wall, thereby reducing the space occupied by the battery cell, which is conducive to improving the energy density of the battery.

[0010] In some embodiments, the heat-resistant coating is an aluminum oxide coating. Selecting aluminum oxide as the coating material is helpful to improve the insulation of the heat-resistant component.

[0011] In some embodiments, the first wall has a first surface facing the insulating member, and the heat-resistant member is a heat-resistant adhesive layer covering at least a portion of the first surface. Covering at least a portion of the first surface in the form of a heat-resistant adhesive layer facilitates connecting the heat-resistant member to the first surface, thereby facilitating the production and processing of the battery cell.

[0012] In some embodiments, the insulating member has a second surface facing the first wall, and the second surface has a receiving portion, and the receiving portion is configured to receive at least part of the heat-resistant member. Such a design can reduce the size of the battery cell in the thickness direction of the first wall, reduce the space occupied by the battery cell, and help improve the energy density of the battery.

[0013] In some embodiments, the heat-resistant parts are all contained in the containing part. Such a design can reduce the size of the battery cell in the thickness direction of the first wall, reduce the space occupied by the battery cell, and help improve the energy density of the battery.

[0014] In some embodiments, the insulating part is injection molded on the heat-resistant part. The heat-resistant part and the insulating part are injection molded as one body, so that the heat-resistant part is wrapped by the insulating part, so that the insulating part plays a role of wear-resistant protection for the heat-resistant part, effectively reducing the risk of displacement and wear of the heat-resistant part, and the insulating part plays a role of stable positioning and protection for the heat-resistant part. In addition, compared with the structure in which the insulating part and the heat-resistant part are assembled by clamping, riveting and other processes, the technical solution of the present application effectively simplifies the production and assembly process, saves material and tooling costs, reduces production costs and effectively improves production efficiency.

[0015] In some embodiments, the housing includes a shell and a cover plate, the shell has an opening, and the cover plate covers the opening. The first wall is the cover plate, or the first wall is a wall portion of the shell opposite to the cover plate. The design of the opening facilitates accommodating the electrode assembly in the shell through the opening, and the cover plate covers the opening to form a closed space, and the closed space is used to accommodate the electrode assembly.

[0016] In a second aspect, an embodiment of the present application provides a battery, comprising the battery cell provided in the embodiment of the first aspect.

[0017] In the above technical solution, including a battery provided with the battery cell provided by the first aspect embodiment, when the insulating component melts due to thermal runaway of the battery cell, the heat-resistant component can play a heat-resistant and insulating role, thereby improving the reliability of the battery during use.

[0018] In a third aspect, an embodiment of the present application provides an electrical device, comprising the battery provided in the embodiment of the second aspect.

[0019] The above technical solution includes an electrical device equipped with a battery cell provided by the first embodiment. When the insulating member melts due to thermal runaway of the battery cell, the heat-resistant member can play a role of heat resistance and insulation, thereby improving the reliability of the electrical device during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0022] Figure 2 An exploded view of a battery provided for some embodiments of the present application;

[0023] Figure 3 A schematic diagram of a plurality of battery cells connected via a busbar provided in some embodiments of the present application;

[0024] Figure 4 An exploded view of a battery cell provided for some embodiments of the present application;

[0025] Figure 5 An exploded view of a first wall, a heat-resistant member and an insulating member provided for some embodiments of the present application;

[0026] Figure 6 An exploded view of another first wall, a heat-resistant member and an insulating member provided for some embodiments of the present application;

[0027] Figure 7 Another exploded view of a first wall, a heat-resistant member and an insulating member provided for some embodiments of the present application;

[0028] Figure 8 An exploded view of a housing provided for some embodiments of the present application;

[0029] Fig. 9An exploded view of another housing provided for some embodiments of the present application.

[0030] The reference numerals in the specific implementation manner are as follows:

[0031] 1000 – vehicles;

[0032] 100 - battery; 200 - controller; 300 - motor;

[0033] 10 - box body; 11 - first part; 12 - second part;

[0034] 20 - battery cell; 21 - shell; 211 - shell: 211A - opening; 212 - first wall; 212A - first surface; 213 - cover plate; 22 - electrode assembly; 221 - pole ear; 23 - insulating member; 23A - second surface; 23B - receiving portion; 24 - adapter; 241 - first section; 242 - second section; 25 - electrode terminal; 26 - heat-resistant member; 26A - heat-resistant coating; 26B - heat-resistant adhesive layer;

[0035] 30 - Busbar. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0037] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0038] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0039] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0040] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0041] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0042] The term "plurality" used in the present application refers to two or more (including two).

[0043] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0044] Battery cells include, but are not limited to, lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-hydrogen batteries, nickel-cadmium batteries, lead-acid batteries, and the like.

[0045] A battery cell may include a housing and an electrode assembly.

[0046] The housing is used to define a sealed space for accommodating the electrode assembly, electrolyte and other components.

[0047] The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and released back and forth between the positive electrode and the negative electrode. The separator is set between the positive electrode and the negative electrode to reduce the risk of short circuit between the positive and negative electrodes, while allowing active ions to pass through.

[0048] The electrode assembly may further include a tab, which is a component for conducting current from the electrode assembly. The tab includes a positive tab and a negative tab. It can be understood that the positive electrode terminal is used to electrically connect to the positive tab, and the negative electrode terminal is used to electrically connect to the negative tab.

[0049] The housing may have a first wall for mounting an electrode terminal, and the electrode terminal is used to be electrically connected to the electrode assembly to output the electric energy of the battery cell. The electrode terminal may include a positive electrode terminal and a negative electrode terminal.

[0050] The battery cell may further include a transition piece, which is a component for electrically connecting the electrode terminal and the tab.

[0051] The battery cell may further include an insulating member. The insulating member is a member that separates the first wall from the adapter, and the insulating member is used to achieve insulation isolation between the first wall and the adapter. The insulating member is made of insulating material.

[0052] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0053] When short circuit, overcharge and other phenomena occur, thermal runaway may occur inside the battery cell, resulting in a sudden increase in pressure or temperature. The increase in the temperature of the battery cell may cause the insulating member between the first wall and the electrode assembly to melt. The increase in pressure inside the battery cell may cause the electrode assembly to move toward the first wall. The simultaneous occurrence of the two may cause a short circuit between the first wall and the electrode assembly, which in turn further increases the temperature of the battery cell and ultimately leads to heat diffusion.

[0054] In view of this, an embodiment of the present application provides a battery cell, including a shell, an electrode terminal, an electrode assembly, an insulating member, a adapter and a heat-resistant member. The shell has a first wall. The electrode terminal is insulated and installed on the first wall. The electrode assembly is accommodated in the shell, and the electrode assembly has a pole ear. The insulating member is arranged between the first wall and the electrode assembly. The adapter electrically connects the pole ear and the electrode terminal. The heat-resistant member is arranged between the first wall and the insulating member. The heat-resistant member is made of an insulating material, and the melting point of the heat-resistant member is higher than the melting point of the insulating member. Along the thickness direction of the first wall, the projection of the heat-resistant member covers the projection of the adapter. When the insulating member is melted by heat due to thermal runaway of the battery cell, the heat-resistant member can still exist on the first wall to play an insulating role between the first wall and the electrode assembly of the battery cell, which is beneficial to limiting the further increase of the temperature of the battery cell and improving the reliability of the battery cell.

[0055] The embodiments of the present application provide an electric device using a battery as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0056] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device in an embodiment of the present application.

[0057] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000, for example, the battery 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0058] In some embodiments of the present application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0059] According to some embodiments of the present application, referring to Figure 2 , and further refer to Figure 3 , Figure 2 An exploded view of a battery 100 provided in some embodiments of the present application, Figure 3A schematic diagram of a plurality of battery cells 20 connected by a busbar 30 provided in some embodiments of the present application. The battery 100 may include a case 10 and a battery cell 20, and the battery cell 20 is accommodated in the case 10. Among them, the case 10 is used to provide a housing for the battery cell 20, and the case 10 may adopt a variety of structures. In some embodiments, the case 10 may include a first part 11 and a second part 12, the first part 11 and the second part 12 cover each other, and the first part 11 and the second part 12 jointly define a housing for accommodating the battery cell 20. The second part 12 may be a hollow structure with one end open, the first part 11 may be a plate-like structure, the first part 11 covers the open side of the second part 12, so that the first part 11 and the second part 12 jointly define a housing; the first part 11 and the second part 12 may also be hollow structures with one side open, and the open side of the first part 11 covers the open side of the second part 12. Of course, the connection between the first part 11 and the second part 12 can be sealed by a sealing member (not shown in the figure), and the sealing member can be a sealing ring, a sealant, etc.

[0060] Of course, the box body 10 formed by the first part 11 and the second part 12 can be in various shapes, such as a cylinder, a cuboid, etc.

[0061] Optionally, the first part 11 and the second part 12 can be made of a material with a certain hardness and strength (such as aluminum alloy). In this way, the box body 10 is not easily deformed when squeezed or collided, so that the battery cell 20 can have a higher structural strength, which is beneficial to reducing the degree of damage to the battery 100 caused by external force collision.

[0062] In the battery 100, the battery cell 20 can be one or more. If there are more than one battery cell 20, the battery cells 20 can be connected in series, in parallel or in a mixed connection. A mixed connection means that the battery cells 20 are connected in series and in parallel. The battery cells 20 can be directly connected in series, in parallel or in a mixed connection, and then the whole formed by the battery cells 20 can be accommodated in the box 10; of course, the battery cells 20 can be connected in series, in parallel or in a mixed connection to form a battery module, and then the battery modules can be connected in series, in parallel or in a mixed connection to form a whole, and then accommodated in the box 10. The battery cell 20 can be cylindrical, flat, rectangular or in other shapes. Figure 2 The case where the battery cell 20 is a rectangular parallelepiped is exemplarily shown.

[0063] like Figure 3 As shown, the battery (not shown in the figure) may further include a busbar 30 , and the plurality of battery cells 20 may be electrically connected via the busbar 30 to achieve series connection, parallel connection or mixed connection of the plurality of battery cells 20 .

[0064] According to some embodiments of the present application, referring to Figure 4 , and further refer to Figure 5 , Figure 4 An exploded view of a battery cell 20 provided in some embodiments of the present application, Figure 5 An exploded view of a first wall 212, a heat-resistant member 26 and an insulating member 23 provided for some embodiments of the present application. A battery cell 20 comprises a shell 21, an electrode terminal 25, an electrode assembly 22, an insulating member 23, an adapter 24 and a heat-resistant member 26. The shell 21 has a first wall 212. The electrode terminal 25 is insulated and mounted on the first wall 212. The electrode assembly 22 is accommodated in the shell 21, and the electrode assembly 22 has a tab 221. The insulating member 23 is disposed between the first wall 212 and the electrode assembly 22. The adapter 24 electrically connects the tab 221 and the electrode terminal 25. The heat-resistant member 26 is disposed between the first wall 212 and the insulating member 23. The heat-resistant member 26 is made of an insulating material, and the melting point of the heat-resistant member 26 is higher than the melting point of the insulating member 23. Along the thickness direction of the first wall 212, the projection of the heat-resistant member 26 covers the projection of the adapter 24.

[0065] The housing 21 is used to encapsulate the electrode assembly 22 and electrolyte components. The housing 21 can be a steel housing, an aluminum housing, a plastic housing (such as polypropylene), a composite metal housing (such as a copper-aluminum composite housing) or an aluminum-plastic film.

[0066] The housing 21 has a sealed space therein, and the sealed space is used to accommodate the electrode assembly 22 .

[0067] Optionally, the enclosed space can also be used to accommodate electrolytes, which are used to conduct ions. The electrolytes can be liquid, gel or solid.

[0068] Optionally, the outer shell 21 may be in various shapes. The shape of the outer shell 21 may be determined according to the specific shape of the electrode assembly 22 . Figure 4 The case where the housing 21 and the electrode assembly 22 are rectangular parallelepiped is exemplarily shown.

[0069] The electrode assembly 22 includes a positive electrode (not shown in the figure), a negative electrode (not shown in the figure), and a separator (not shown in the figure).

[0070] Optionally, the electrode assembly 22 may be a wound structure. A positive electrode sheet (not shown in the figure) and a negative electrode sheet (not shown in the figure) are wound into a wound structure; or, the electrode assembly 22 may also be a stacked structure formed by stacking a positive electrode sheet (not shown in the figure), a separator (not shown in the figure) and a negative electrode sheet (not shown in the figure), which is not limited in the embodiments of the present application.

[0071] The electrode terminal 25 is used to be electrically connected to the electrode assembly 22 to output the electric energy of the battery cell 20. The electrode terminal 25 may include a positive electrode terminal (not shown in the figure) and a negative electrode terminal (not shown in the figure).

[0072] The first wall 212 is a side wall of the housing 21 for mounting the electrode terminal 25 .

[0073] The tabs 221 are components for conducting current from the electrode assembly 22. The tabs 221 include a positive tab (not shown in the figure) and a negative tab (not shown in the figure). It can be understood that the positive electrode terminal (not shown in the figure) is used to be electrically connected to the positive tab (not shown in the figure), and the negative electrode terminal (not shown in the figure) is used to be electrically connected to the negative tab (not shown in the figure).

[0074] The adapter 24 is a component for electrically connecting the electrode terminal 25 and the tab 221 .

[0075] The insulating member 23 is a component that separates the first wall 212 from the electrode assembly 22 . It can be understood that the insulating member 23 can be made of insulating materials such as plastic and rubber.

[0076] The heat-resistant part 26 is an insulating component located between the insulating part 23 and the first wall 212. Its function is that when the battery cell 20 has thermal runaway and causes the insulating part 23 to melt due to heat, the heat-resistant part 26 can still exist on the first wall 212 to play an insulating role between the first wall 212 and the electrode assembly 22 of the battery cell 20.

[0077] Optionally, the adapter 24 includes a first section 241 and a second section 242, the first section 241 is used to connect to the electrode terminal 25, and the second section 242 is used to connect to the pole ear 221, and in the thickness direction X, the distance between the first section 241 and the first wall 212 is greater than the distance between the second section 242 and the first wall 212.

[0078] It can be understood that, along the thickness direction X, the projection of the heat-resistant member 26 covers the projection of the second section 242 .

[0079] Along the thickness direction X of the first wall 212, the projection of the heat-resistant member 26 covers the projection of the adapter 24, so that when the electrode assembly 22 of the battery cell 20 moves toward the first wall 212 due to thermal runaway, the adapter 24 connected to the tab 221 of the electrode assembly 22 preferentially abuts against the heat-resistant member 26. Thus, the electrode assembly 22 and the first wall 212 are insulated, which is beneficial to limiting the further rise in the temperature of the battery cell 20 and improving the reliability of the battery cell 20 during use.

[0080] According to some embodiments of the present application, the melting point of the heat-resistant member 26 is greater than 200°C.

[0081] Optionally, the heat-resistant member 26 may be made of one or more of aluminum oxide, silicon carbide, boron nitride and polyimide, all of which are materials with good heat resistance and insulation properties.

[0082] Reference Figure 4 and Figure 5 , which is beneficial to limit the abutment between the electrode assembly 22 and the first wall 212, and is beneficial to limit the short circuit of the battery cell 20, thereby helping the heat-resistant member 26 to play a better protective role.

[0083] According to some embodiments of the present application, referring to Figure 6 , Figure 6 Another exploded view of the first wall 212, the heat-resistant member 26 and the insulating member 23 provided in some embodiments of the present application: The first wall 212 has a first surface 212A facing the insulating member 23, and the heat-resistant member 26 is a heat-resistant coating 26A covering at least a portion of the first surface 212A.

[0084] The first surface 212A is a side surface of the first wall 212 facing the insulating member 23 .

[0085] Heat-resistant coating 26A is a special functional coating that can maintain its physical and chemical properties for a long time at higher temperatures.

[0086] The heat-resistant coating 26A covers at least part of the first surface 212A, which means that at least part of the projection of the adapter (not shown) overlaps with the projection of the heat-resistant coating 26A along the thickness direction X of the first wall 212 .

[0087] When the heat-resistant coating 26A covers a portion of the first surface 212A, the amount of the heat-resistant coating 26A used is reduced, which is beneficial for reducing the production cost of the battery cell (not shown in the figure).

[0088] When the heat-resistant coating 26A completely covers the first surface 212A, the first surface 212A of the first wall 212 can be easily coated, which is beneficial to improving the production efficiency of battery cells (not shown in the figure).

[0089] Using the heat-resistant coating 26A as the heat-resistant member 26 can reduce the size of the heat-resistant member 26 in the thickness direction X of the first wall 212, thereby reducing the space occupied by the battery cell (not shown in the figure), which is beneficial to improving the energy density of the battery (not shown in the figure).

[0090] According to some embodiments of the present application, the heat-resistant coating 26A is an aluminum oxide coating.

[0091] Understandable, see Figure 6 The heat-resistant coating 26A may include but is not limited to one or more of aluminum oxide, silicon carbide, and boron nitride.

[0092] Preferably, the heat-resistant coating 26A may be an aluminum oxide coating. The aluminum oxide coating has high temperature resistance and can still maintain the integrity of the heat-resistant component 26 when the temperature is greater than 200°C.

[0093] This helps to limit the battery cell (not shown in the figure). When thermal runaway occurs, the electrode assembly (not shown in the figure) abuts against the first wall 212, thereby helping to limit the short circuit of the battery cell (not shown in the figure), thereby helping the heat-resistant part 26 to play a better protective role.

[0094] According to some embodiments of the present application, referring to Figure 7 , Figure 7 Another exploded view of the first wall 212, the heat-resistant member 26 and the insulating member 23 provided in some embodiments of the present application: The first wall 212 has a first surface 212A facing the insulating member 23, and the heat-resistant member 26 is a heat-resistant adhesive layer 26B covering at least a portion of the first surface 212A.

[0095] The first surface 212A is a side surface of the first wall 212 facing the insulating member 23 .

[0096] The heat-resistant adhesive layer 26B is a special functional adhesive that can maintain its physical and chemical properties for a long time at a higher temperature.

[0097] The heat-resistant adhesive layer 26B covers at least a portion of the first surface 212A, which means that at least a portion of the projection of the adapter 24 overlaps with the projection of the heat-resistant adhesive layer 26B along the thickness direction X of the first wall 212 .

[0098] Optionally, the heat-resistant adhesive layer 26B may be made of polyimide.

[0099] When the heat-resistant adhesive layer 26B covers a portion of the first surface 212A, the amount of the heat-resistant adhesive layer 26B is reduced, which is beneficial to reducing the production cost of the battery cell (not shown in the figure).

[0100] When the heat-resistant adhesive layer 26B completely covers the first surface 212A, the first surface 212A of the first wall 212 can be easily coated, which is beneficial to improving the production efficiency of battery cells (not shown in the figure).

[0101] At least a portion of the first surface 212A is covered with a heat-resistant adhesive layer 26B to facilitate connection between the heat-resistant member 26 and the first surface 212A, thereby facilitating production and processing of the battery cell (not shown in the figure).

[0102] According to some embodiments of the present application, continue to refer to Figure 7The insulating member 23 has a second surface 23A facing the first wall 212 , and the second surface 23A has a receiving portion 23B configured to receive at least a portion of the heat-resistant member 26 .

[0103] The second surface 23A is a side surface of the insulating member 23 facing the first wall 212 .

[0104] The accommodation portion 23B is a groove formed on the second surface 23A.

[0105] It can be understood that the shape of the accommodating portion 23B can be set according to the shape of the heat-resistant part 26. For example, the heat-resistant part 26 is rectangular and the accommodating portion 23B is also rectangular; or, the heat-resistant part 26 is circular and the accommodating portion 23B is also circular, which is not limited to the embodiments of the present application.

[0106] The accommodation portion 23B is configured to accommodate at least part of the heat-resistant member 26, which may refer to that part or all of the heat-resistant member 26 is located in the accommodation portion 23B along the thickness direction X of the first wall 212. In the embodiment where the heat-resistant member 26 is partially located in the accommodation portion 23B, a groove for accommodating the remaining part of the heat-resistant member 26 is provided on the first surface 212A of the first wall 212.

[0107] Along the thickness direction X of the first wall 212, at least a portion of the heat-resistant part 26 is accommodated in the accommodating portion 23B, which can reduce the size of the battery cell (not shown in the figure) in the thickness direction X of the first wall 212, thereby reducing the space occupied by the battery cell (not shown in the figure), which is beneficial to improving the energy density of the battery (not shown in the figure).

[0108] According to some embodiments of the present application, continue to refer to Figure 7 , the heat-resistant member 26 is entirely accommodated in the accommodation portion 23B.

[0109] In the embodiment where the heat-resistant member 26 is entirely located in the accommodation portion 23B, the side of the heat-resistant member 26 facing away from the insulating member 23 is flush with the first surface 212A.

[0110] The heat-resistant part 26 is completely accommodated in the accommodating portion 23B, which can reduce the size of the battery cell (not shown in the figure) in the thickness direction X of the first wall 212, thereby reducing the space occupied by the battery cell (not shown in the figure), which is beneficial to improving the energy density of the battery (not shown in the figure).

[0111] According to some embodiments of the present application, referring to Figure 6 and Figure 7 The insulating member 23 is injection molded on the heat-resistant member 26 .

[0112] The insulating member 23 is injection molded on the heat-resistant member 26 , which means that the insulating member 23 and the first wall 212 are integrally formed by plastic extrusion molding using an injection molding process to cover the heat-resistant member 26 .

[0113] The heat-resistant part 26 and the insulating part 23 are injection molded as one body, so that the heat-resistant part 26 is wrapped by the insulating part 23, so that the insulating part 23 plays a role of wear-resistant protection for the heat-resistant part 26, effectively reducing the risk of displacement and wear of the heat-resistant part 26, and the insulating part 23 plays a role of stable positioning and protection for the heat-resistant part 26.

[0114] According to some embodiments of the present application, referring to Figure 8 and Fig. 9 , Figure 8 The exploded view of the housing 21 provided in some embodiments of the present application. The housing 21 includes a shell 211 and a cover plate 213. The shell 211 has an opening 211A, and the cover plate 213 covers the opening 211A. The first wall 212 is the cover plate 213, or the first wall 212 is the wall portion of the shell 211 opposite to the cover plate 213.

[0115] The case 211 is a component for accommodating the electrode assembly 22 .

[0116] The cover plate 213 is a component that covers the opening 211A of the housing 211 to isolate the internal environment of the battery cell (not shown) from the external environment.

[0117] It is understandable that the shape of the cover plate 213 can be adapted to the shape of the housing 211. For example, the housing 211 is a rectangular parallelepiped structure, and the cover plate 213 is a rectangular plate structure adapted to the housing 211. The material of the cover plate 213 can also be a variety of materials, such as copper, iron, aluminum, steel, aluminum alloy, etc. The material of the cover plate 213 and the material of the housing 211 can be the same or different.

[0118] Understandable, see Figure 8 , the first wall 212 may be a cover plate 213; or, referring to Fig. 9 The first wall 212 may also be a wall portion opposite to the shell 211 and the cover plate 213, which is not limited in the embodiment of the present application.

[0119] The design of the opening 211A facilitates the electrode assembly (not shown) to be accommodated in the shell 211 through the opening 211A. The cover plate 213 covers the opening 211A to provide a stable accommodation space for the electrode assembly (not shown).

[0120] According to some embodiments of the present application, referring to Figure 4 , Figure 5 and Figure 6The present application provides a battery cell 20, including a shell 21, an electrode terminal 25, an electrode assembly 22, an insulating member 23, a adapter 24 and a heat-resistant member 26. The shell 21 has a first wall 212. The electrode terminal 25 is insulated and installed on the first wall 212. The electrode assembly 22 is accommodated in the shell 21, and the electrode assembly 22 has a pole ear 221. The insulating member 23 is arranged between the first wall 212 and the electrode assembly 22. The adapter 24 electrically connects the pole ear 221 and the electrode terminal 25. The heat-resistant member 26 is arranged between the first wall 212 and the insulating member 23. The heat-resistant member 26 is made of an insulating material, and the melting point of the heat-resistant member 26 is higher than the melting point of the insulating member 23, and is greater than 200°C. Along the thickness direction of the first wall 212, the projection of the heat-resistant member 26 covers the projection of the adapter 24. The first wall 212 has a first surface 212A facing the insulating member 23 . The heat-resistant member 26 is a heat-resistant coating 26A that completely covers the first surface 212A. The heat-resistant coating 26A is an aluminum oxide coating. The insulating member 23 is injection molded on the heat-resistant member 26 .

[0121] According to some embodiments of the present application, referring to Figure 4 , Figure 5 and Figure 6 The present application provides a battery cell 20, including a shell 21, an electrode terminal 25, an electrode assembly 22, an insulating member 23, a adapter 24 and a heat-resistant member 26. The shell 21 has a first wall 212. The electrode terminal 25 is insulated and installed on the first wall 212. The electrode assembly 22 is accommodated in the shell 21, and the electrode assembly 22 has a pole ear 221. The insulating member 23 is arranged between the first wall 212 and the electrode assembly 22. The adapter 24 electrically connects the pole ear 221 and the electrode terminal 25. The heat-resistant member 26 is arranged between the first wall 212 and the insulating member 23. The heat-resistant member 26 is made of an insulating material, and the melting point of the heat-resistant member 26 is higher than the melting point of the insulating member 23, and is greater than 200°C. Along the thickness direction of the first wall 212, the projection of the heat-resistant member 26 covers the projection of the adapter 24. The first wall 212 has a first surface 212A facing the insulating member 23, and the heat-resistant member 26 is a heat-resistant adhesive layer 26B covering at least a portion of the first surface 212A. The insulating member 23 has a second surface 23A facing the first wall 212, and the second surface 23A has a receiving portion 23B, and the receiving portion 23B is configured to receive at least a portion of the heat-resistant member 26. The insulating member 23 is injection molded on the heat-resistant member 26.

[0122] According to some embodiments of the present application, referring to Figure 4 , Figure 5 and Figure 6 as well as Figure 7The present application provides a battery cell 20, including a shell 21, an electrode terminal 25, an electrode assembly 22, an insulating member 23, a transition member 24 and a heat-resistant member 26. The shell 21 has a first wall 212. The electrode terminal 25 is insulated and installed on the first wall 212. The electrode assembly 22 is accommodated in the shell 21, and the electrode assembly 22 has a pole ear 221. The insulating member 23 is arranged between the first wall 212 and the electrode assembly 22. The transition member 24 electrically connects the pole ear 221 and the electrode terminal 25. The heat-resistant member 26 is arranged between the first wall 212 and the insulating member 23. The heat-resistant member 26 is made of an insulating material, and the melting point of the heat-resistant member 26 is higher than the melting point of the insulating member 23, and is greater than 200°C. Along the thickness direction X, the projection of the heat-resistant member 26 covers the projection of the second section 242 of the transition member 24. The insulating member 23 is injection molded on the heat-resistant member 26.

[0123] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell, characterized in that: include: a housing having a first wall; an electrode terminal, insulated and mounted on the first wall; An electrode assembly is contained in the housing, and the electrode assembly has a tab; an insulating member, disposed between the first wall and the electrode assembly; A transition piece, electrically connecting the tab and the electrode terminal; Among them, the battery cell also includes a heat-resistant part, which is arranged between the first wall and the insulating part. The heat-resistant part is made of insulating material, and the melting point of the heat-resistant part is higher than the melting point of the insulating part. Along the thickness direction of the first wall, the projection of the heat-resistant part covers the projection of the adapter.

2. The battery cell according to claim 1, characterized in that: The melting point of the heat-resistant member is greater than 200°C.

3. The battery cell according to claim 1, characterized in that: The first wall has a first surface facing the insulating member, and the heat-resistant member is a heat-resistant coating covering at least a portion of the first surface.

4. The battery cell according to claim 3, characterized in that: The heat-resistant coating is an aluminum oxide coating.

5. The battery cell according to claim 1, characterized in that: The first wall has a first surface facing the insulating member, and the heat-resistant member is a heat-resistant adhesive layer covering at least a portion of the first surface.

6. The battery cell according to claim 1, characterized in that: The insulating member has a second surface facing the first wall, and the second surface has a receiving portion configured to receive at least a portion of the heat-resistant member.

7. The battery cell according to claim 6, characterized in that: The heat-resistant member is entirely accommodated in the accommodation portion.

8. The battery cell according to claim 1, characterized in that: The insulating component is injection molded on the heat-resistant component.

9. The battery cell according to claim 1, characterized in that: The housing comprises a shell and a cover plate, the shell has an opening, and the cover plate covers the opening; The first wall is the cover plate, or the first wall is a wall portion of the housing opposite to the cover plate.

10. A battery, characterized in that: The invention comprises a battery cell as claimed in any one of claims 1 to 9.

11. An electrical device, characterized in that: Comprising a battery as claimed in claim 10, the battery is used to provide electrical energy.

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