Battery cell, battery, and electric device

Abstract

The present application is applicable to the technical field of batteries (100), and provides a battery cell (10), a battery (100), and an electric device. The electric device comprises the battery (100). The battery (100) comprises the battery cell (10). The battery cell (10) comprises an electrode assembly (11), a first electrode terminal (13a), a first adapter (14a), and a heat insulation structure (15). The electrode assembly (11) comprises a main body portion (111) and a first tab (112a) arranged on the main body portion (111). The first adapter (14a) is conductively connected to the first tab (112a) and the first electrode terminal (13a). At least part of the heat insulation structure (15) is arranged on the side of the first adapter (14a) facing the main body portion (111). In this way, the first adapter (14a) can be isolated from the main body portion (111), so as to alleviate the problem of the first adapter (14a) coming into contact with the main body portion (111), thereby alleviating the problem of a short circuit occurring inside the electrode assembly (11) due to the fact that a separator of the main body portion (111) is scalded or melted by means of the first adapter (14a).

Description

Battery cells, batteries and electrical devices

[0001] Cross-references

[0002] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of the People's Republic of China on August 11, 2023, with application number 202311013229.4 and application name "Battery Cell, Battery and Electrical Device", the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the field of battery technology, and in particular to a battery cell, a battery, and an electrical device. Background Art

[0004] In related technologies, a battery cell includes an electrode assembly, electrode terminals, and an adapter. The adapter is welded to the electrode assembly's tabs and electrode terminals, respectively, to achieve electrical continuity between the electrode assembly and the electrode terminals. This allows for flow of current between the electrode assembly and the electrode terminals, generating heat when the adapter passes current.

[0005] In some cases, the adapter may come into contact with the main body of the electrode assembly, causing the heat generated by the adapter to be transferred to the main body of the electrode assembly. This may cause the diaphragm of the electrode assembly to melt, resulting in a risk of a short circuit inside the electrode assembly.

[0006] Summary of the Invention

[0007] In view of the above problems, the purpose of the embodiments of the present application is to provide a battery cell, a battery and an electrical device that can improve the technical problem that the adapter will melt the electrode assembly and cause an internal short circuit in the electrode assembly.

[0008] The technical solution adopted in the embodiment of this application is:

[0009] In a first aspect, an embodiment of the present application provides a battery cell, comprising:

[0010] The electrode assembly includes a main body and a first electrode tab provided on the main body;

[0011] a first electrode terminal;

[0012] a first adapter, conductively connected to the first tab and the first electrode terminal;

[0013] The heat insulation structure is at least partially disposed on a side of the first adapter facing the main body.

[0014] The battery cell provided in the embodiment of the present application is provided with a heat insulation structure on the side of the first adapter facing the main body, which can slow down the heat conduction between the main body and the first adapter to a certain extent, thereby improving the problem of heat transfer from the first adapter to the main body causing the main body to melt, and further reducing the risk of internal short circuit in the electrode assembly.

[0015] In some embodiments, the thermal conductivity of the thermal insulation structure is ≤0.7 W / m·K.

[0016] Such a configuration enables the heat-insulating structure to have a weaker heat-conducting capability, thereby slowing down the conduction of heat between the first adapter and the main body, thereby reducing the risk of short circuit inside the electrode assembly.

[0017] In some embodiments, the insulating structure has insulating properties.

[0018] With such an arrangement, the heat-insulating structure can also achieve insulation between the first adapter and the main body, thereby improving the problem of direct conduction between the first adapter and the main body causing a direct short circuit inside the electrode assembly.

[0019] In some embodiments, the thermal insulation structure includes one or more of a copolymer of perfluoropropyl vinyl ether and polytetrafluoroethylene, mica, ceramic, glass fiber, carbon fiber, carbon-carbon composite material, or pre-oxidized silk aerogel.

[0020] By using the above materials in the heat insulation structure, the heat insulation structure is a high-temperature resistant structure with a higher melting point and a lower thermal conductivity coefficient, and the heat insulation structure also has insulation performance.

[0021] In some embodiments, the thermal insulation structure is a coating.

[0022] Such an arrangement makes the forming process of the thermal insulation structure very simple.

[0023] In some embodiments, the first adapter is provided with a first position, the first tab is connected to the first position, and the thermal insulation structure is arranged to avoid the first position.

[0024] With such an arrangement, on the basis that the heat insulation structure can slow down the heat conduction between the first adapter and the main body, the arrangement of the heat insulation structure can be reduced and the arrangement of the heat insulation structure can be facilitated.

[0025] In some embodiments, the first adapter is provided with a plurality of first positions distributed at intervals, and the first tab is connected to the plurality of first positions.

[0026] In this way, on the one hand, the current distribution between the first adapter and the first tab can be made more uniform, thereby reducing the overcurrent temperature of the first adapter. On the other hand, a greater overcurrent capacity can be provided between the first adapter and the first tab.

[0027] In some embodiments, the battery cell further includes a shell, and the electrode assembly, the first adapter and the thermal insulation structure are all disposed in the shell; the shell is provided with an injection hole, and the first position is located on a side of the first electrode terminal away from the injection hole.

[0028] By locating the first position on the side of the first electrode terminal away from the injection hole, the first adapter can be arranged as far away from the injection hole as possible, so that the first adapter will not interfere with the operation of the injection hole to a certain extent.

[0029] In some embodiments, the housing is provided with a first wall, and the injection hole and the first electrode terminal are spaced apart from each other on the first wall.

[0030] Such an arrangement enables the first adapter, the first electrode terminal and the injection hole to be arranged very compactly, and the first adapter will not interfere with the operation of injecting the electrolyte into the housing.

[0031] In some embodiments, the first tab includes a plurality of first sub-tabs, the plurality of first sub-tabs are connected to form a first connection structure, and at least a portion of the first connection structure is connected to the first position.

[0032] The first tab is pre-connected to form a first connection structure, and then the first connection structure is conductively connected to the first position, so that the first tab can be better conductively connected to the first adapter.

[0033] In some embodiments, the area of ​​all the first positions occupies 10% to 25% of the area of ​​the side of the first adapter facing the main body.

[0034] This allows the connection between the first adapter and the first tab to have a greater current capacity. During normal current flow through the first adapter, the first adapter can be kept at a lower temperature, reducing the risk of melting the diaphragm in the main body. Furthermore, the first adapter can reserve a certain position for a fuse area, ensuring that the fuse area effectively melts when the first adapter short-circuits.

[0035] In some embodiments, the first adapter is provided with a positioning through hole, the first electrode terminal is inserted into the positioning through hole, and a portion of the thermal insulation structure is provided on a side of the first electrode terminal facing the main body.

[0036] By providing the heat insulating structure on the side of the first electrode terminal facing the main body, the first electrode terminal and the main body can be isolated.

[0037] In some embodiments, the electrode assembly further includes a second tab disposed on the main body; the battery cell further includes a second electrode terminal and a second adapter, and the second adapter is conductively connected to the second tab and the second electrode terminal.

[0038] Such an arrangement enables indirect conductive connection between the first tab and the first electrode terminal, and between the second tab and the second electrode terminal, through the adapter, which facilitates the assembly of the battery cell.

[0039] In some embodiments, the first electrode tab is a positive electrode tab, and the second electrode tab is a negative electrode tab.

[0040] By providing a heat insulating structure on the first adapter used to respectively conduct and connect the positive electrode tab and the positive electrode terminal, the problem of the first adapter scalding or even melting the diaphragm can be improved, thereby better improving the problem of battery cell short circuit.

[0041] In some embodiments, a portion of the heat insulation structure is disposed on a side of the second adapter facing the main body.

[0042] Such a configuration enables the heat insulation structure to slow down the heat conduction between the second adapter and the main body, thereby improving the problem of the second adapter directly contacting the main body, causing burns or even melting of the diaphragm.

[0043] In some embodiments, the second adapter is provided with a second position, the second tab is connected to the second position, and the thermal insulation structure is arranged to avoid the second position.

[0044] In this way, on the basis that the heat insulation structure can slow down the heat transfer between the second adapter and the main body, the arrangement of the heat insulation structure can be reduced and the arrangement of the heat insulation structure can be facilitated.

[0045] In some embodiments, the second adapter is provided with a plurality of second positions distributed at intervals, and the second tab is connected to the plurality of second positions.

[0046] This, on the one hand, makes the current distribution between the second adapter and the second tab more uniform, thereby reducing the overcurrent temperature of the second adapter. On the other hand, it can provide a greater overcurrent capacity between the second adapter and the second tab. On the other hand, it can reduce the size of the second tab in the first direction, thereby helping to increase the energy density of the battery cell.

[0047] In some embodiments, at least a portion of the second electrode terminal is located between the two second locations.

[0048] Such an arrangement makes the multiple second positions of the second adapter for connecting to the second tab more dispersed, which can make the current inside the battery cell more uniform, thereby reducing the overcurrent temperature of the second adapter and further reducing the risk of the second adapter causing the diaphragm to melt.

[0049] In some embodiments, the second tab includes a plurality of second sub-tabs, the plurality of second sub-tabs are connected to form a second connection structure, and at least a portion of the second connection structure is connected to the second position.

[0050] The second tab is connected to the second adapter by connecting the plurality of second sub-tabs of the second tab to form a second connection structure, and then conductively connected to the second position through the second connection structure, so that the second tab can be better conductively connected to the second adapter.

[0051] In some embodiments, the plurality of second sub-tabs are connected to form a plurality of second connection structures that are spaced apart from each other, and each second connection structure is connected to a corresponding second position.

[0052] A plurality of second sub-pole tabs of the second pole tab are connected to form a plurality of second connection structures, so that each second connection structure is connected to each second position of the second adapter, so that the current between the second adapter and the second pole tab can be more evenly distributed, thereby reducing the overcurrent temperature of the second adapter, thereby reducing the risk of internal short circuit of the battery cell caused by melting of the diaphragm.

[0053] In some embodiments, the area of ​​all the second positions occupies 10% to 25% of the area of ​​the side of the second adapter facing the main body.

[0054] This allows the connection between the second adapter and the second tab to have a greater current capacity. During normal current flow through the second adapter, the second adapter can be kept at a lower temperature, reducing the risk of melting the diaphragm in the main body. Furthermore, the second adapter can reserve a certain position for a fuse area, ensuring that the fuse area effectively melts when the second adapter short-circuits.

[0055] In some embodiments, the battery cell further comprises a housing, wherein the electrode assembly, the first adapter, the second adapter, and the thermal insulation structure are all disposed within the housing;

[0056] The first electrode tab and the second electrode tab are respectively arranged at the opposite ends of the main body along the first direction, and the first wall and the second wall are respectively provided at the opposite ends of the shell along the first direction, the first electrode terminal is provided on the first wall, and the second electrode terminal is provided on the second wall; along the first direction, the first adapter is provided between the first electrode tab and the first wall, and the second adapter is provided between the second electrode tab and the second wall.

[0057] By adopting the above technical solution, the overall layout of the battery cells is made more reasonable.

[0058] In a second aspect, an embodiment of the present application provides a battery comprising a battery cell.

[0059] The battery provided in the embodiment of the present application can improve the problem of diaphragm melting of the battery cell by adopting the battery cell involved above, thereby reducing the risk of battery short circuit.

[0060] In a third aspect, an embodiment of the present application provides an electrical device including a battery cell or a battery.

[0061] The electrical device provided in the embodiment of the present application can improve the problem of diaphragm melting of the battery cell by adopting the battery cell or battery involved above, thereby reducing the risk of battery short circuit.

[0062] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or exemplary technical descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0064] FIG1 is a schematic diagram of a vehicle provided in some embodiments of the present application;

[0065] FIG2 is an exploded schematic diagram of a battery provided in some embodiments of the present application;

[0066] FIG3 is a cross-sectional view of a battery cell provided in some embodiments of the present application;

[0067] FIG4 is an enlarged view of point A in FIG3 ;

[0068] FIG5 is a bottom view of the housing, the first adapter, the first electrode terminal, and the first thermal insulation member of the battery cell provided in FIG3 ;

[0069] Figure 6 is an enlarged view of point B in Figure 3;

[0070] FIG7 is a top view of the housing, the second adapter, the second electrode terminal, and the second thermal insulation member of the battery cell provided in FIG3 .

[0071] In the figures, the reference numerals are: 1000 - vehicle; 100 - battery; 200 - controller; 300 - motor; 10 - battery cell; 20 - housing; 21 - first part; 22-second part; 11-electrode assembly; 111-main body; 112-ear; 112a-first ear; 1121a-first connecting structure; 112b-second ear; 1121b-second connecting structure; 12-shell; 1201-liquid injection hole; 121-shell; 122-end cover; 122a-first wall; 122b-second wall; 13-electrode terminal; 13a-first electrode terminal; 13b-second electrode terminal; 14-adapter; 1401-first position; 1402-second position; 1403-first positioning through hole; 1404-second positioning through hole; 14a-first adapter; 14b-second adapter; 15-thermal insulation structure; 151-first thermal insulation member; 152-second thermal insulation member; Y-first direction; X-second direction. DETAILED DESCRIPTION

[0072] The following describes in detail embodiments of the present application, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0073] In the description of this application, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0074] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or to implicitly indicate the quantity of the technical features indicated. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features.

[0075] In the description of this application, "a plurality of" means more than two, and unless otherwise specifically defined, "more than two" includes two. Accordingly, "a plurality of groups" means more than two groups, including two groups.

[0076] In the description of this application, unless otherwise expressly specified or limited, terms such as "installed," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0077] In the description of this application, the term "and / or" is simply a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists, A and B exist at the same time, and B exists. In addition, in this application, the character " / " generally indicates that the related objects are in an "or" relationship.

[0078] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and components may be substituted with equivalents without departing from the scope of the present application. In particular, the various technical features described in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions within the scope of the claims.

[0079] A battery cell typically includes an electrode assembly, electrode terminals, and an adapter. The adapter is welded to the electrode assembly's tabs and electrode terminals, respectively, to achieve electrical continuity between the electrode assembly and the electrode terminals. This allows for flow of current between the electrode assembly and the electrode terminals.

[0080] It should be noted that the adapter generates heat when overcurrent flows. In some cases, the adapter will contact the main body of the electrode assembly, causing the heat generated by the adapter to be transferred to the main body of the electrode assembly. This poses the risk of melting the diaphragm of the electrode assembly and causing a short circuit inside the electrode assembly. In particular, when a battery cell short-circuits, the current inside the adapter increases sharply, and energy is released rapidly, causing the temperature inside the adapter to rise sharply. Based on this, when the adapter contacts the main body of the electrode assembly, the diaphragm of the main body is very likely to be burned or even melted.

[0081] In related art, the electrode assembly's tabs and adapters are welded together. The tabs create a certain amount of clearance between the electrode assembly's main body and the adapter, thus alleviating the problem of the adapter directly contacting the main body. However, under conditions such as gas production, severe vibration, and a sharp increase in the internal temperature of the electrode assembly, heat from the adapter can still easily transfer to the main body of the electrode assembly, causing an internal short circuit in the electrode assembly.

[0082] Based on the above considerations, the embodiments of the present application provide a battery cell, a battery and an electrical device. By providing a heat insulation structure on the side of the first adapter facing the main body, the heat conduction between the main body and the first adapter can be slowed down to a certain extent, thereby improving the problem of heat from the first adapter being transferred to the main body causing the main body to melt, and further reducing the risk of internal short circuit in the electrode assembly.

[0083] In some embodiments, the battery cells involved in the embodiments of the present application can be used in electrical devices that use battery cells or batteries as power sources, and the batteries involved in the embodiments of the present application can be used in electrical devices that use batteries as power sources.

[0084] Electrical devices may include, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, and the like. Electric toys may include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. Spacecraft may include airplanes, rockets, space shuttles, and spacecraft. Vehicles may include gasoline-powered vehicles, gas-powered vehicles, or new energy vehicles. New energy vehicles may include pure electric vehicles, hybrid electric vehicles, or extended-range electric vehicles.

[0085] In some embodiments, the battery cells and batteries involved in the embodiments of the present application may also be used in energy storage devices, such as energy storage containers, energy storage cabinets, and the like.

[0086] The battery involved in the embodiments of the present application can be a single physical module comprising one or more battery cells to provide higher voltage and capacity. When there are multiple battery cells, the multiple battery cells are connected in series, parallel, or in hybrid mode through a busbar. Hybrid mode refers to the multiple battery cells being connected in both series and parallel mode.

[0087] In some embodiments, the battery may be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module. For example, the multiple battery cells may be fixed to form a battery module using a rolling strip or the like. For example, the multiple battery cells may also be fixed to form a battery module using end plates, side plates, or the like.

[0088] In some embodiments, the battery may be a battery pack, which may include a housing and battery cells. As an example, the battery cells may be directly housed in the housing. As an example, the battery cells may also be formed into a battery module first and then housed in the housing.

[0089] For ease of description, the embodiments of the present application are described using a vehicle as an example of an electrical device.

[0090] Please refer to Figure 1, which is a schematic diagram of a vehicle 1000 provided in some embodiments of the present application. The above-mentioned battery 100 is provided inside the vehicle 1000. The battery 100 can be provided at the bottom, head, or tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000. For example, the battery 100 can serve as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. 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.

[0091] In some embodiments, the battery 100 can serve not only as an operating power source for the vehicle 1000 , but also 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 .

[0092] Please refer to Figure 2, which is an exploded view of a battery 100 provided in some embodiments of the present application. The battery 100 includes a housing 20 and a plurality of battery cells 10. The housing 20 is a structure with a storage space inside, and the housing 20 can adopt a variety of structures. In some embodiments, the housing 20 can include a first portion 21 and a second portion 22, which cover each other and together define the storage space. The first portion 21 can be a hollow structure with an opening at one end, and the second portion 22 can be a plate-like structure. The second portion 22 covers the open side of the first portion 21, so that the first portion 21 and the second portion 22 jointly define the storage space. Alternatively, the first portion 21 and the second portion 22 can both be hollow structures with an opening at one end, as shown in Figure 2, with the open side of the first portion 21 covering the open side of the second portion 22, so that the first portion 21 and the second portion 22 jointly define the storage space. The housing 20 composed of the first portion 21 and the second portion 22 can have a variety of shapes, such as a cylinder, a rectangular parallelepiped, etc.

[0093] In some embodiments, multiple battery cells 10 can be connected in series, in parallel, or in a hybrid to form a whole, which can then be directly housed in the aforementioned accommodation space of the housing 20, as shown in FIG2 . Alternatively, multiple battery cells 10 can be first connected in series, in parallel, or in a hybrid, and then arranged and fixed to form multiple battery modules, which can then be further connected in series, in parallel, or in a hybrid to form a whole, which can then be housed in the aforementioned accommodation space of the housing 20.

[0094] In some embodiments, referring to FIG1 and FIG2 , when the battery 100 is used in a vehicle 1000, the housing 20 of the battery 100 may serve as part of the chassis structure of the vehicle 1000. For example, a portion of the housing 20 may form at least a portion of the chassis of the vehicle 1000, or a portion of the housing 20 may form at least a portion of a cross member or a longitudinal member of the vehicle 1000.

[0095] A battery cell 10 is the smallest unit that stores and outputs electrical energy. The battery cell 10 can be a secondary battery or a primary battery. The battery cell 10 can be, but is not limited to, a metal battery, a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery. The battery cell 10 can be cylindrical, flat, rectangular, or other shapes.

[0096] Please refer to FIG3 , which is a cross-sectional view of a battery cell 10 provided in some embodiments of the present application. The battery cell 10 includes an electrode assembly 11 , a housing 12 , and an electrode terminal 13 .

[0097] The electrode assembly 11 is a component in the battery cell 10 where electrochemical reactions occur. The electrode assembly 11 is primarily formed by winding or stacking positive and negative electrode sheets, with a separator provided between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets containing active materials constitute the main body 111 of the electrode assembly 11, while the portions of the positive and negative electrode sheets not containing active materials each constitute a tab 112. The tab 112 of the positive electrode sheet is the positive electrode tab, and the tab 112 of the negative electrode sheet is the negative electrode tab. The positive and negative electrode tabs may be located together at one end of the main body or at opposite ends of the main body 111.

[0098] In the battery cell 10 , the number of the electrode assembly 11 may be one or more.

[0099] In some cases, the electrode assembly 11 may also be referred to as a bare cell, a wound body, a laminated body, etc.

[0100] In some embodiments, the battery cell 10 may further include an electrolyte, which serves to conduct ions between the positive electrode and the negative electrode. The electrolyte involved in the embodiments of the present application may be in liquid, gel, or solid form.

[0101] The outer shell 12 may include a shell 121 and an end cap 122. The shell 121 and the end cap 122 are components for jointly defining the internal environment of the battery cell 10. The internal environment defined by the shell 121 and the end cap 122 is used to accommodate the electrode assembly 11 and the electrolyte. The shell 121 and the end cap 122 may be independent components. Specifically, the shell 121 has an opening, and the end cap 122 is provided at the opening of the shell 121 to jointly define the internal environment of the battery cell 10 with the shell 121 and isolate the internal environment of the battery cell 10 from the external environment. The shell 121 and the end cap 122 may also be an integrated structure. Specifically, a common connection surface may be formed between the end cap 122 and the shell 121 before the electrode assembly 11 is placed in the shell. After the electrode assembly 11 is placed in the shell, when the electrode assembly 11 needs to be encapsulated, the end cap 122 is then placed to cover the shell 121.

[0102] The number of the end cap 122 can be one or two, and the two end caps 122 are respectively disposed at two opposite ends of the housing 121 .

[0103] The shell 121 may be cylindrical, square, or other shapes, depending on the shape and size of the electrode assembly 11. Furthermore, the shell 121 and the end cap 122 may be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, or plastic.

[0104] The electrode terminal 13 is a component with conductive properties, and serves as a current transmission end of the battery cell 10 for transmitting current. The electrode terminal 13 may be, but is not limited to, a pole.

[0105] The electrode terminal 13 is electrically connected to the tab 112. Specifically, the electrode terminal 13 can be directly electrically connected to the tab 112, for example, by welding. An adapter 14 can also be provided between the electrode terminal 13 and the tab 112. The adapter 14 enables the connection between the electrode terminal 13 and the tab 112 to enable current flow, thereby indirectly achieving an electrically conductive connection between the electrode terminal 13 and the tab 112. The adapter 14 refers to a metal structure with conductive properties, such as, but not limited to, a copper busbar. The adapter 14 is provided within the housing 12.

[0106] There are two electrode terminals 13 , which are a positive electrode terminal and a negative electrode terminal. The positive electrode terminal is conductively connected to the positive electrode tab, and the negative electrode terminal is conductively connected to the negative electrode tab.

[0107] The electrode terminal 13 is provided on the outer shell 12. Specifically, the electrode terminal 13 can be provided on the shell 121 of the outer shell 12, or on the end cap 122 of the outer shell 12. For example, the positive electrode terminal and the negative electrode terminal can be provided on the shell 121 at the same time; or, as shown in FIG3 , the positive electrode terminal and the negative electrode terminal can be provided on the end cap 122 at the same time; or, one of the positive electrode terminal and the negative electrode terminal can be provided on the shell 121, and the other can be provided on the end cap 122.

[0108] The positive electrode terminal and the negative electrode terminal may be disposed at the same end of the housing 12 ; or, as shown in FIG3 , the positive electrode terminal and the negative electrode terminal may be disposed at opposite ends of the housing 12 .

[0109] Please refer to Figures 3 and 4 together, and in conjunction with other accompanying drawings. Figure 4 is an enlarged view of point A in Figure 3. The battery cell 10 provided in the embodiment of the present application includes an electrode assembly 11, a first electrode terminal 13a, a first adapter 14a and a thermal insulation structure 15. The electrode assembly 11 includes a main body 111 and a first pole tab 112a, and the first pole tab 112a is provided on the main body 111. The first adapter 14a is conductively connected to the first pole tab 112a and the first electrode terminal 13a. At least a portion of the thermal insulation structure 15 is provided on the side of the first adapter 14a facing the main body 111.

[0110] The first electrode tab 112 a may be a positive electrode tab or a negative electrode tab.

[0111] It is understood that the electrode assembly 11 further includes a second electrode tab 112b. The first electrode tab 112a and the second electrode tab 112b are spaced apart from each other on the main body 111. When the first electrode tab 112a is the positive electrode tab, the second electrode tab 112b is the negative electrode tab. When the first electrode tab 112a is the negative electrode tab, the second electrode tab 112b is the positive electrode tab.

[0112] The first electrode terminal 13a, also known as the electrode terminal 13, is a conductive component that can be, but is not limited to, a terminal post. The first electrode terminal 13a serves as the current transmission terminal for the battery cell 10 to transmit current. When the first tab 112a is a positive electrode tab, the first electrode terminal 13a is the positive electrode terminal, and the first adapter 14a is the positive adapter. When the first tab 112a is a negative electrode tab, the first electrode terminal 13a is the negative electrode terminal, and the first adapter 14a is the negative adapter.

[0113] The first adapter 14a is the adapter 14, which is a conductive component and can be, but is not limited to, a copper busbar. The first adapter 14a is used to connect the first electrode terminal 13a and the first tab 112a, thereby indirectly achieving a conductive connection between the first electrode terminal 13a and the first tab 112a.

[0114] The first adapter 14a is conductively connected to the first tab 112a and the first electrode terminal 13a, meaning that the first adapter 14a is conductively connected to the first tab 112a and the first adapter 14a is conductively connected to the first tab 112a. The first adapter 14a is conductively connected to the first tab 112a, meaning that the first adapter 14a is connected to the first tab 112a and the first adapter 14a is electrically conductive with the first tab 112a. The first adapter 14a is conductively connected to the first electrode terminal 13a, meaning that the first adapter 14a is connected to the first electrode terminal 13a and the first adapter 14a is electrically conductive with the first electrode terminal 13a. Based on this, the first adapter 14a can achieve overcurrent between the first tab 112a and the first electrode terminal 13a.

[0115] As an example, the first adapter 14a is welded to the first tab 112a to achieve a conductive connection. As an example, the first adapter 14a is welded to the first electrode terminal 13a to achieve a conductive connection. The conductive connection between the first adapter 14a and the first tab 112a can be achieved by laser welding, ultrasonic welding, penetration welding, or the like. The conductive connection between the first adapter 14a and the first electrode terminal 13a can also be achieved by laser welding, ultrasonic welding, penetration welding, or the like.

[0116] As shown in FIG. 3 and FIG. 4 , the first adapter 14 a is disposed on the first electrode tab 112 a such that at least a portion of the first adapter 14 a faces the main body 111 of the electrode assembly 11 .

[0117] The thermal insulation structure 15 refers to a component with a thermal insulation function. The thermal insulation structure 15 can block heat to slow the spread of heat. Specifically, at least a portion of the thermal insulation structure 15 is disposed on the side of the first adapter 14a facing the main body 111. In this way, the thermal insulation structure 15 can separate the first adapter 14a from the main body 111, and to a certain extent prevent the first adapter 14a from directly contacting the main body 111. Furthermore, the thermal insulation structure 15 can also isolate the heat between the first adapter 14a and the main body 111, thereby improving the problem of heat spreading from the first adapter 14a to the main body 111.

[0118] It is understandable that the thermal insulation structure 15 may include a first thermal insulation member 151, which is a portion of the thermal insulation structure 15 disposed on the side of the first adapter 14a facing the main body 111. That is, the first thermal insulation member 151 is a portion of the thermal insulation structure 15 and also has a thermal insulation function.

[0119] As an example, as shown in Figures 3 and 4, the first electrode tab 112a is provided at one end of the main body 111 along the first direction Y. In the first direction Y, the first adapter 14a is provided at one end of the first electrode tab 112a away from the main body, and the first adapter 14a is conductively connected to the first electrode terminal 13a and the first electrode tab 112a, respectively. At least a portion of the first adapter 14a faces the main body 111 along the first direction Y. In addition, at least a portion of the thermal insulation structure 15 is provided on a side of the first adapter 14a facing the main body 111 along the first direction Y. In this way, under the isolation effect of the thermal insulation structure 15, the first adapter 14a cannot directly contact the main body 111, that is, the thermal insulation structure 15 can improve the problem of the first adapter 14a directly contacting the main body 111. Furthermore, the heat insulation structure 15 can also isolate the heat of the first adapter 14 a and the main body 111 , so as to improve the problem of the diaphragm being burned or melted due to the heat of the first adapter 14 a being transferred to the main body 111 .

[0120] The first direction Y is the height direction or the length direction of the battery cell 10 .

[0121] Figures 3 and 4 illustrate a plane coordinate system, where the X-axis and Y-axis are two mutually perpendicular coordinate axes in the plane coordinate system, i.e., the Y-axis is perpendicular to the X-axis. A first direction Y is parallel to the Y-axis, and the X-axis is parallel to a second direction X, referred to below, i.e., the first direction Y is perpendicular to the second direction X.

[0122] The first electrode tab 112 a and the second electrode tab 112 b may be disposed at opposite ends of the main body 111 along the first direction Y, or the first electrode tab 112 a and the second electrode tab 112 b may be spaced apart and disposed at the same end of the main body 111 along the first direction Y.

[0123] In the battery cell 10 provided in the embodiment of the present application, the first electrode tab 112a and the first adapter 14a are electrically connected, and the first electrode terminal 13a and the first adapter 14a are electrically connected, thereby achieving an indirect electrical connection between the first electrode tab 112a and the first electrode terminal 13a. Furthermore, a thermal insulation structure 15 is provided on the side of the first adapter 14a facing the main body 111. This can separate the main body 111 and the first adapter 14a to a certain extent, thereby improving the problem of the first adapter 14a directly contacting the main body 111. Furthermore, the thermal insulation structure 15 can also slow down the heat conduction between the main body 111 of the electrode assembly 11 and the first adapter 14a, thereby improving the problem of heat from the first adapter 14a being transferred to the main body 111, causing the diaphragm of the main body 111 to melt, thereby reducing the risk of internal short circuits in the electrode assembly 11.

[0124] In some embodiments, the thermal conductivity of the thermal insulation structure 15 is ≤0.7 W / m·K.

[0125] For example, the thermal conductivity of the thermal insulation structure 15 may be 0.7 W / m·K, 0.65 W / m·K, 0.6 W / m·K, 0.55 W / m·K, 0.5 W / m·K, or the like.

[0126] By setting the thermal insulation structure 15 to a structure with a smaller thermal conductivity coefficient, the thermal insulation structure 15 can have a weaker thermal conductivity effect, which can slow down the conduction of heat between the first adapter 14a and the main body 111, thereby improving the problem of melting of the diaphragm of the main body 111, and further reducing the risk of internal short circuit of the electrode assembly 11.

[0127] In some embodiments, the thermal insulation structure 15 has insulating properties.

[0128] With this arrangement, the heat insulating structure 15 can also achieve insulation between the first adapter 14 a and the main body 111 , thereby improving the problem of direct short circuit inside the electrode assembly 11 caused by direct conduction between the first adapter 14 a and the main body 111 .

[0129] In some embodiments, the thermal insulation structure 15 includes one or more of a copolymer of perfluoropropyl vinyl ether and polytetrafluoroethylene, mica, ceramic, glass fiber, carbon fiber, carbon-carbon composite material, or pre-oxidized silk aerogel.

[0130] It is understood that the thermal insulation structure 15 can be made of at least one of the aforementioned materials, such that the thermal insulation structure 15 includes at least one of a structure composed of a copolymer of perfluoropropyl perfluorovinyl ether and polytetrafluoroethylene, a mica structure, a ceramic structure, a glass fiber structure, a carbon fiber structure, a carbon-carbon composite material, or a pre-oxidized silk aerogel structure.

[0131] By using the aforementioned materials for the thermal insulation structure 15, the thermal insulation structure 15 becomes a high-temperature resistant structure with a high melting point and low thermal conductivity. This provides excellent thermal insulation, effectively preventing heat transfer from the first adapter 14a to the diaphragm of the main body 111, which could cause burns or melting. This can also alleviate the problem of short circuits in the main body 111. Furthermore, the thermal insulation structure 15 also provides insulation properties, thereby preventing the problem of short circuits in the battery cells 10 caused by electrical contact between the first adapter 14a and the main body 111.

[0132] In some embodiments, the thermal insulation structure 15 is a coating layer.

[0133] It is understandable that a coating with heat insulation properties may be coated on the side of the first adapter 14 a facing the main body 111 , thereby forming a heat insulation structure 15 .

[0134] Such an arrangement makes the molding process of the heat insulation structure 15 very simple.

[0135] In some embodiments, please refer to Figures 3 to 5 in conjunction with other drawings. Figure 5 is a bottom view of the housing 12, first adapter 14a, first electrode terminal 13a, and first thermal insulation member 151 of the battery cell 10 provided in an embodiment of the present application, specifically a view from the second adapter 14b along the first direction Y pointing toward the first adapter 14a. The bottom view shows the projection of the first electrode terminal 13a, first tab 112a, first connection structure 1121a, and first position 1401 on the first adapter 14a using dotted lines. The first adapter 14a has a first position 1401, and the first tab 112a is connected to the first position 1401. The thermal insulation structure 15 is configured to avoid the first position 1401.

[0136] The first position 1401 refers to a position of the first adapter 14a for connecting to the first tab 112a. Specifically, the first tab 112a is conductively connected to the portion of the first adapter 14a located at the first position 1401.

[0137] When the first adapter 14 a is welded to the first tab 112 a , a weld mark formed by the welding of the first adapter 14 a and the first tab 112 a is located at the first position 1401 .

[0138] In this way, on the basis that the thermal insulation structure 15 can slow down the heat conduction between the first adapter 14 a and the main body 111 , the arrangement of the thermal insulation structure 15 can be reduced, and the thermal insulation structure 15 can be conveniently arranged on the first adapter 14 a .

[0139] In some embodiments, please refer to FIG. 3 to FIG. 5 in conjunction with other drawings. The first adapter 14 a has a plurality of first locations 1401 spaced apart from each other, and the first tab 112 a is connected to the plurality of first locations 1401 .

[0140] By electrically connecting the first tab 112a to the portions corresponding to the multiple first positions 1401 of the first adapter 14a, the first tab 112a is connected to multiple different positions of the first adapter 14a. This, on the one hand, makes the current distribution between the first adapter 14a and the first tab 112a more uniform, thereby reducing the overcurrent temperature of the first adapter 14a, thereby alleviating the problem of heat concentration caused by current concentration in the first adapter 14a. This, in turn, alleviates the problem of excessive heat in the first adapter 14a causing burns or melting of the diaphragm of the main body 111, thereby reducing the risk of short circuiting the battery cell 10. On the other hand, this allows for greater overcurrent capacity between the first adapter 14a and the first tab 112a.

[0141] In some embodiments, to facilitate the conductive connection between the first tab 112 a and the first adapter 14 a , the first position 1401 is located on a side of the first adapter 14 a facing the main body 111 .

[0142] In some embodiments, please refer to Figures 3 to 5 in conjunction with other figures. The battery cell 10 further includes a housing 12. The electrode assembly 11, the first adapter 14a, and the thermal insulation structure 15 are all disposed within the housing 12. The first electrode terminal 13a is disposed within the housing 12. The housing 12 defines a liquid injection port 1201. The first position 1401 is located on a side of the first electrode terminal 13a away from the liquid injection port 1201.

[0143] The injection hole 1201 is a hole for allowing electrolyte to enter the internal environment of the battery cell 10. Specifically, the injection hole 1201 is a through-hole formed in the outer shell 12. The injection hole 1201 is connected to the internal environment defined by the outer shell 12. Thus, electrolyte can be injected into the internal environment defined by the outer shell 12 through the injection hole 1201, so that the electrolyte infiltrates the electrode assembly 11 within the internal environment defined by the outer shell 12. The injection hole 1201 can be provided in the shell 121 of the outer shell 12 or in the end cap 122 of the outer shell 12.

[0144] First position 1401 is located on the side of first electrode terminal 13a away from injection hole 1201. It can be understood that, in the distribution direction of first electrode terminal 13a and injection hole 1201, first position 1401 is located on the side of first electrode terminal 13a away from injection hole 1201. That is, at least a portion of first electrode terminal 13a is located between first position 1401 and injection hole 1201, so that the line (straight line) connecting injection hole 1201 and first position 1401 can pass through first electrode terminal 13a. Furthermore, multiple first positions 1401 are located on the same side of first electrode terminal 13a away from injection hole 1201, that is, the line (straight line) connecting any two adjacent first positions 1401 does not pass through first electrode terminal 13a.

[0145] As an example, as shown in FIG5 and in combination with other drawings, the first electrode terminals 13a and the liquid injection holes 1201 are distributed in sequence along the second direction X.

[0146] Since the first position 1401 is located on the side of the first electrode terminal 13a away from the injection hole 1201, the first adapter 14a can be arranged as far away from the injection hole 1201 as possible, so that the first adapter 14a will not interfere with the operation of the injection hole 1201.

[0147] In some embodiments, please refer to FIG. 3 to FIG. 5 in conjunction with other drawings. The housing 12 has a first wall 122 a , and the liquid injection hole 1201 and the first electrode terminal 13 a are spaced apart from each other on the first wall 122 a .

[0148] It can be understood that the liquid injection hole 1201 and the first electrode terminal 13a are spaced apart and disposed on the same side wall of the housing 12. For example, the first wall 122a is disposed on the side wall of the housing 12 along the first direction Y. In the first direction Y, the first adapter 14a is disposed between the first electrode tab 112a and the first wall 122a. Furthermore, in the second direction X, the first position 1401 is disposed on a side of the first electrode terminal 13 away from the liquid injection hole 1201.

[0149] The first wall 122 a may be the shell 121 of the outer shell 12 , or may be the end cover 122 of the outer shell 12 .

[0150] This arrangement allows the first adapter 14a, first electrode terminal 13a, and injection hole 1201 to be positioned very compactly, helping to improve the energy density of the battery cell 10. Furthermore, the first electrode terminal 13a and injection hole 1201 are spaced apart, allowing the first adapter 14a to be positioned away from the injection hole 1201. This prevents the first adapter 14a from interfering with the injection of electrolyte into the housing 12.

[0151] 3 and 5 , the injection hole 1201 and the first adapter 14 a are spaced apart along the first direction Y. Furthermore, the injection hole 1201 and the first adapter 14 a are spaced apart along the second direction X.

[0152] In some embodiments, if the area of ​​the first adapter 14a is large enough, multiple first locations 1401 can be distributed on opposite sides of the first electrode terminal 13a. Specifically, at least a portion of the first electrode terminal 13a can be positioned between two first locations 1401, that is, a line (straight line) connecting the two first locations 1401 can pass through the first electrode terminal 13a. This can make the current distribution in the first adapter 14a more uniform and reduce the risk of separator melting.

[0153] In some embodiments, referring to FIG. 3 to FIG. 5 and other figures, the first tab 112 a includes a plurality of first sub-tabs connected to form a first connection structure 1121 a , at least a portion of which is connected to the first position 1401 .

[0154] The first sub-tab is a portion of the first tab 112a, and is disposed on the main body 111. A plurality of first sub-tabs constitute the first tab 112a.

[0155] The first connection structure 1121a is a portion of the first tab 112a. Multiple first sub-tabs are connected to form the first connection structure 1121a, which enhances the integrity of the first tab 112a, facilitates connection between the first tab 112a and the first adapter 14a, and facilitates electrical conduction between the first tab 112a and the first adapter 14a.

[0156] Based on the above structure, in the process of conductively connecting the first pole tab 112a and the first adapter 14a, the multiple first sub-pole tabs of the first pole tab 112a can be connected to form a first connection structure 1121a, and then the first connection structure 1121a can be connected to the first position 1401 of the first adapter 14a to form a conductive connection between the first connection structure 1121a and the first adapter 14a.

[0157] The first tab 112a is connected to form a first connection structure 1121a by connecting a plurality of first sub-tabs of the first tab 112a. The first connection structure 1121a is then conductively connected to the first position 1401, so that the first tab 112a can be better conductively connected to the first adapter 14a.

[0158] In some embodiments, the plurality of first sub-tabs are welded to form the first connection structure 1121 a , that is, the plurality of first sub-tabs are pre-welded to form the first connection structure 1121 a .

[0159] In some embodiments, the plurality of first sub-tabs can be pre-welded by ultrasonic welding to form the first connection structure 1121a, and the first connection structure 1121a can be laser welded to the first position 1401 of the first adapter 14a. Of course, the plurality of first sub-tabs can also be connected by other means to form the first connection structure 1121a, and the first connection structure 1121a and the first adapter 14a can also be conductively connected by other means.

[0160] In some embodiments, when multiple first sub-tabs are connected to form the first connection structure 1121a, they can also be simultaneously connected to the first adapter 14a. This can improve the connection strength between the first tab 112a and the first adapter 14a, helping to improve the conductive stability of the first tab 112a and the first adapter 14a.

[0161] 5 , the first thermal insulation member 151 is disposed away from the first connection structure 1121a. Specifically, the first thermal insulation member 151 is disposed away from the projection of the first connection structure 1121a on the side of the first adapter 14a facing the main body 111.

[0162] In this way, on the basis that the heat insulation structure 15 can slow down the heat conduction between the first adapter 14 a and the main body 111 , the number of heat insulation structures 15 can be reduced.

[0163] In some embodiments, referring to FIG3 to FIG5 in conjunction with other drawings, the area of ​​all first positions 1401 of the first adapter 14 a accounts for 10% to 25% of the area of ​​the side of the first adapter 14 a facing the main body 111 .

[0164] It can be understood that the first position 1401 is located on the side of the first adapter 14a facing the main body 111. The area of ​​the first position 1401 accounts for 11%, 12%, 15%, 16%, 18%, 20%, 21%, 22%, 24%, etc. of the area of ​​the side of the first adapter 14a facing the main body 111.

[0165] This arrangement ensures that first position 1401 has a relatively suitable area. Specifically, the projection of the connection trace between first tab 112a and first adapter 14a on first adapter 14a has a relatively suitable area. This ensures that the connection between first adapter 14a and first tab 112a has a relatively high current capacity. During normal current flow through first adapter 14a, first adapter 14a is kept at a relatively low temperature, reducing the risk of melting the diaphragm in main body 111. Furthermore, first adapter 14a can reserve a certain area for a fuse region, ensuring that the fuse region effectively fuses when first adapter 14a short-circuits.

[0166] The fusing area refers to an area of ​​the first adapter 14 a that is fused when a short circuit occurs, so that the first adapter 14 a can be disconnected to achieve a protection function.

[0167] In some embodiments, please refer to Figures 3 to 5 in conjunction with other figures. The first adapter 14a has a positioning hole, into which the first electrode terminal 13a is inserted. A portion of the thermal insulation structure 15 is disposed on the side of the first electrode terminal 13a facing the main body 111. Specifically, the first thermal insulation member 151 of the thermal insulation structure 15 is also disposed on the side of the first electrode terminal 13a facing the main body 111.

[0168] The positioning through-hole is a through-hole extending through the first adapter 14a. For ease of description, this positioning through-hole is referred to as first positioning through-hole 1403. The first electrode terminal 13a is inserted into the first positioning through-hole 1403 to achieve positioning between the first electrode terminal 13a and the first adapter 14a, thereby facilitating conductive connection between the first electrode terminal 13a and the first adapter 14a.

[0169] As shown in Figure 4 , the first positioning through-hole 1403 extends through the first adapter 14a along the first direction Y. Thus, when the first electrode terminal 13a is inserted into the first positioning through-hole 1403, one end of the first electrode terminal 13a along the first direction Y faces the main body 111. This poses a risk of direct contact between the first electrode terminal 13a and the main body 111, posing a risk of scalding or even melting the separator.

[0170] By placing the thermal insulation structure 15 on the side of the first electrode terminal 13a facing the main body 111, the first electrode terminal 13a and the main body 111 can be separated. On the one hand, the problem of the first electrode terminal 13a burning or even melting the separator can be improved, thereby reducing the risk of internal short circuits in the electrode assembly 11. On the other hand, when the thermal insulation structure 15 has insulating properties, it can also achieve insulation between the first electrode terminal 13a and the main body 111, thus reducing the problem of the first electrode terminal 13a contacting the main body 111 and causing internal short circuits in the battery cell 10.

[0171] It should be noted that when the first electrode terminal 13a does not extend out of the first positioning through hole 1403, so that there is no risk of the first electrode terminal 13a directly contacting the main body 111, the thermal insulation structure 15 may not be provided on the side of the first electrode terminal 13a facing the main body 111.

[0172] In some embodiments, please refer to Figures 3 and 6 together, in conjunction with other figures. Figure 6 is an enlarged view of point B in Figure 3 . The electrode assembly 11 further includes a second electrode tab 112b. The first electrode tab 112a and the second electrode tab 112b are spaced apart from each other in the main body 111. The battery cell 10 further includes a second electrode terminal 13b and a second adapter 14b. The second adapter 14b is electrically connected to the second electrode tab 112b and the second electrode terminal 13b.

[0173] The second electrode terminal 13b is also the aforementioned electrode terminal 13 and is a conductive component, which may be, but is not limited to, a pole. The second electrode terminal 13b is used as a current transmission end of the battery cell 10 to transmit current.

[0174] The second adapter 14b is the adapter 14, a conductive component that can be, but is not limited to, a copper busbar. The second adapter 14b is used to connect the second electrode terminal 13b and the second tab 112b, thereby indirectly achieving a conductive connection between the second electrode terminal 13b and the second tab 112b.

[0175] Among them, the way in which the second electrode tab 112b is conductively connected to the second adapter 14b can refer to the way in which the first electrode tab 112a is conductively connected to the first adapter 14a, and the way in which the second adapter 14b is conductively connected to the second electrode terminal 13b can also refer to the way in which the first electrode terminal 13a is conductively connected to the first adapter 14a, which will not be repeated here.

[0176] Such an arrangement enables indirect conductive connection between the first electrode tab 112 a and the first electrode terminal 13 a , and between the second electrode tab 112 b and the second electrode terminal 13 b through the adapter 14 , which facilitates the assembly of the battery cell 10 .

[0177] In some embodiments, referring to FIG3 and in conjunction with other figures, the first electrode tab 112 a is a positive electrode tab, and the second electrode tab 112 b is a negative electrode tab.

[0178] Correspondingly, the first electrode terminal 13a is a positive electrode terminal, and the first adapter 14a is a positive adapter.

[0179] It should be noted that when the battery cell 10 is in use, the positive electrode adapter generates higher heat than the negative electrode adapter, which is more likely to burn or even melt the separator. The first adapter 14a contacts the main body 111, causing a higher risk of short-circuiting the electrode assembly 11.

[0180] By providing a heat insulating structure 15 on the first adapter 14a used for conducting and connecting the positive electrode tab and the positive electrode terminal, the problem of the first adapter 14a scalding or even melting the separator can be improved, thereby effectively improving the problem of short circuit of the battery cell 10.

[0181] In some embodiments, please refer to FIG. 3 to FIG. 6 in conjunction with other drawings. A portion of the heat insulation structure 15 is disposed on a side of the second adapter 14 b facing the main body 111 .

[0182] It is understandable that the thermal insulation structure 15 may further include a second thermal insulation member 152, which is a portion of the thermal insulation structure 15 disposed on the side of the second adapter 14b facing the main body 111. That is, the second thermal insulation member 152 is a portion of the thermal insulation structure 15 and also has a thermal insulation function.

[0183] As shown in Figures 3 and 6 , the second electrode tab 112b is also disposed at an end of the main body 111 along the first direction Y. The first electrode tab 112a and the second electrode tab 112b can be disposed at opposite ends of the main body 111 along the first direction Y, or at the same end of the main body 111 along the first direction Y. Furthermore, in the first direction Y, the second adapter 14b is disposed between the second electrode tab 112b and the second electrode terminal 13b, with the second adapter 14b facing the main body 111 along the first direction Y. The second thermal insulator 152 is disposed on the side of the second adapter 14b facing the main body 111 along the first direction Y.

[0184] Such a configuration allows the heat insulation structure 15 to slow down the heat conduction between the second adapter 14b and the main body 111, thereby improving the problem of the second adapter 14b directly contacting the main body 111, causing burns or even melting of the membrane.

[0185] Furthermore, when the heat insulation structure 15 also has insulation performance, the risk of short circuiting the battery cell 10 due to the conduction between the second adapter 14 b and the main body 111 can be reduced.

[0186] In some embodiments, please refer to Figures 3, 6, and 7 in conjunction with other figures. Figure 7 is a top view of the housing 12, second adapter 14b, second electrode terminal 13b, and second thermal insulation member 152 of the battery cell 10 provided in some embodiments of the present application. Specifically, it is a view from the first adapter 14a along the first direction Y pointing toward the second adapter 14b. This top view illustrates the projection of the second electrode terminal 13b, second tab 112b, second connection structure 1121b, and second position 1402 onto the second adapter sheet using dotted lines. The second adapter 14b is provided with a second position 1402, the second tab 112b is connected to the second position 1402, and the thermal insulation structure 15 is configured to avoid the second position 1402.

[0187] The second position 1402 refers to a position of the second adapter 14b for connecting to the second tab 112b. Specifically, the second tab 112b is conductively connected to the portion of the second adapter 14b located at the second position 1402.

[0188] When the second adapter 14 b and the second tab 112 b are welded, a weld mark formed by the welding of the second adapter 14 b and the second tab 112 b is located at the second position 1402 .

[0189] In this way, on the basis that the thermal insulation structure 15 can slow down the heat conduction between the second adapter 14 b and the main body 111 , the number of thermal insulation structures 15 can be reduced, and the thermal insulation structure 15 can be conveniently arranged on the second adapter 14 b .

[0190] In some embodiments, please refer to FIG. 3 , FIG. 6 , and FIG. 7 in conjunction with other figures. The second adapter 14 b has a plurality of second locations 1402 spaced apart from each other, and the second tab 112 b is connected to the plurality of second locations 1402 .

[0191] By connecting the second tab 112b to the portions corresponding to the multiple second positions 1402 of the second adapter 14b, the second tab 112b is connected to multiple different positions of the second adapter 14b. This, on the one hand, makes the current distribution between the second adapter 14b and the second tab 112b more uniform, thereby reducing the overcurrent temperature of the second adapter 14b, thereby improving the problem of heat concentration caused by current concentration in the second adapter 14b, and further improving the problem of excessive heat in the second adapter 14b causing burns or melting of the diaphragm of the main body 111, thereby reducing the risk of short circuiting the battery cell 10. On the other hand, it can provide a greater overcurrent capacity between the second adapter 14b and the second tab 112b. On the other hand, the size of the second tab 112b in the first direction Y can be reduced, thereby helping to increase the energy density of the battery cell 10.

[0192] In some embodiments, to facilitate conductive connection between the second tab 112 b and the second adapter 14 b , the second position 1402 is located on a side of the second adapter 14 b facing the main body 111 .

[0193] In some embodiments, referring to FIG. 7 and other figures, at least a portion of the second electrode terminal 13 b is located between the two second positions 1402 .

[0194] It can be understood that the line (straight line) connecting the two second positions 1402 can pass through the second electrode terminal 13b.

[0195] As an example, as shown in FIG7 , two second positions 1402 are spaced apart along the second direction X. Furthermore, a portion of the second electrode terminal 13b is located between the two second positions 1402 . Thus, one second position 1402 , a portion of the second electrode terminal 13b , and another second position 1402 are sequentially distributed along the second direction X, thereby positioning the two second positions 1402 on opposite sides of the second electrode terminal 13b along the second direction X. Of course, in other examples, the two second positions 1402 may also be spaced apart along directions intersecting the first direction Y and the second direction X, respectively, with at least a portion of the second electrode terminal 13b located between the two second positions 1402 .

[0196] Such an arrangement allows the multiple second positions 1402 of the second adapter 14b for connecting to the second tab 112b to be more dispersed, which can make the current inside the battery cell 10 more uniform, thereby reducing the overcurrent temperature of the second adapter 14b and further reducing the risk of the second adapter 14b causing the diaphragm to melt.

[0197] In some embodiments, referring to FIG. 7 and other figures, the second tab 112 b includes a plurality of second sub-tabs connected to form a second connection structure 1121 b , at least a portion of which is connected to the second position 1402 .

[0198] The second sub-electrode tab is a portion of the second electrode tab 112b, and is disposed on the main body 111. A plurality of second sub-electrode tabs constitute the second electrode tab 112b.

[0199] The second connection structure 1121b is a portion of the second tab 112b. Multiple second sub-tabs are connected to form the second connection structure 1121b, which enhances the integrity of the second tab 112b, facilitates connection between the second tab 112b and the second adapter 14b, and facilitates electrical conduction between the second tab 112b and the second adapter 14b.

[0200] Based on the above structure, in the process of conductively connecting the second pole tab 112b and the second adapter 14b, the multiple second sub-pole tabs of the second pole tab 112b can be connected to form a second connection structure 1121b, and then the second connection structure 1121b can be connected to the second position 1402 of the second adapter 14b to form a conductive connection between the second connection structure 1121b and the second adapter 14b.

[0201] The second tab 112b is connected to form a second connection structure 1121b by connecting a plurality of second sub-tabs of the second tab 112b. The second connection structure 1121b is then conductively connected to the second position 1402, so that the second tab 112b can be better conductively connected to the second adapter 14b.

[0202] In some embodiments, the plurality of second sub-tabs of the second tab 112b are welded to form the second connection structure 1121b, that is, the plurality of second sub-tabs of the second tab 112b are pre-welded to form the second connection structure 1121b.

[0203] In some embodiments, the second tab 112b can be pre-welded by ultrasonic welding to form the second connection structure 1121b, and the second connection structure 1121b can be laser welded to the second position 1402 of the second adapter 14b. Of course, the second tab 112b can be pre-connected by other means, and the second connection structure 1121b and the second adapter 14b can also be conductively connected by other means.

[0204] In some embodiments, when the second tab 112b is connected to form the second connection structure 1121b, the second tab 112b can also be connected to the second adapter 14b at the same time. This can improve the connection strength between the second tab 112b and the second adapter 14b, and help improve the conductive stability of the second tab 112b and the second adapter 14b.

[0205] 7 , the second thermal insulation member 152 is disposed away from the second connection structure 1121 b . Specifically, the second thermal insulation member 152 is disposed away from the projection of the second connection structure 1121 b on the side of the second adapter 14 b facing the main body 111 .

[0206] In this way, on the basis that the heat insulation structure 15 can slow down the heat conduction between the second adapter 14 b and the main body 111 , the number of heat insulation structures 15 can be reduced.

[0207] In some embodiments, referring to FIG. 7 and other figures, the second sub-tabs of the second tab 112 b are connected to form a plurality of second connection structures 1121 b spaced apart from each other, each second connection structure 1121 b being connected to a corresponding second position 1402 .

[0208] A plurality of second sub-pole tabs of the second pole tab 112b are connected to form a plurality of second connection structures 1121b, so that each second connection structure 1121b is connected to each second position 1402 of the second adapter 14b, so that the current between the second adapter 14b and the second pole tab 112b can be more evenly distributed, thereby reducing the overcurrent temperature of the second adapter 14b, thereby reducing the risk of internal short circuit of the battery cell 10 caused by melting of the diaphragm.

[0209] In some embodiments, referring to FIG3 , FIG6 and FIG7 together with other drawings, the area of ​​all second positions 1402 of the second adapter 14 b accounts for 10% to 25% of the area of ​​the side of the second adapter 14 b facing the main body 111 .

[0210] It can be understood that the second position 1402 is located on the side of the second adapter 14b facing the main body 111. The area of ​​the second position 1402 accounts for 11%, 12%, 15%, 16%, 18%, 20%, 21%, 22%, 24%, etc. of the area of ​​the side of the second adapter 14b facing the main body 111.

[0211] This arrangement ensures that second position 1402 has a relatively suitable area. Specifically, the projection of the connection trace between second tab 112b and second adapter 14b on second adapter 14b has a relatively suitable area. This ensures that the connection between second adapter 14b and second tab 112b has a relatively high current capacity. During normal current flow through second adapter 14b, this allows the temperature of second adapter 14b to remain relatively low, reducing the risk of melting the diaphragm in main body 111. Furthermore, second adapter 14b can reserve a certain area for a fuse region, ensuring that the fuse region effectively fuses when second adapter 14b short-circuits.

[0212] In some embodiments, as shown in Figures 3 and 6 , the second adapter 14b may also include the aforementioned positioning holes to position the second electrode terminal 13b, thereby facilitating electrical connection between the second electrode terminal 13b and the second adapter 14b. The positioning holes on the second adapter 14b are second positioning holes 1404. Furthermore, a thermal insulation structure 15 may also be provided on the side of the second electrode terminal 13b facing the main body 111. For details, refer to the description of the first positioning holes 1403 above and will not be repeated here.

[0213] In some embodiments, please refer to Figure 3 in conjunction with other drawings. The battery cell 10 also includes a shell 12, and the electrode assembly 11, the first adapter 14a, the second adapter 14b and the thermal insulation structure 15 are all disposed in the shell 12. The first electrode tab 112a and the second electrode tab 112b are respectively disposed at opposite ends of the main body 111 along the first direction Y. The shell 12 is provided with a first wall 122a and a second wall 122b at opposite ends along the first direction Y, the first electrode terminal 13a is provided on the first wall 122a, and the second electrode terminal 13b is provided on the second wall 122b. In the first direction Y, the first adapter 14a is provided between the first wall 122a and the first electrode tab 112a, and the second adapter 14b is provided between the second wall 122b and the second electrode tab 112b.

[0214] It can be understood that the first adapter 14a, the first electrode terminal 13a, and the first wall 122a are all disposed at the end of the electrode assembly 11 having the first electrode tab 112a along the first direction Y, and the first adapter 14a is disposed between the first electrode tab 112a and the first wall 122a along the first direction Y. This arrangement facilitates conductive connection between the first adapter 14a and the first electrode tab 112a and the first electrode terminal 13a.

[0215] The second adapter 14b, the second electrode terminal 13b, and the second wall 122b are all disposed at one end of the electrode assembly having the second electrode tab 112b along the first direction Y, and the second adapter 14b is disposed between the second electrode tab 112b and the second wall 122b along the first direction Y. This arrangement facilitates conductive connection between the second adapter 14a and the second electrode tab 112b and the second electrode terminal 13b.

[0216] By adopting the above technical solution, the overall layout of the battery cells 10 is made more reasonable.

[0217] Based on the above concept, referring to FIG2 , an embodiment of the present application further provides a battery 100, which includes a battery cell 10. The battery cell 10 in this embodiment is the same as the battery cell 10 in the previous embodiment. For details, please refer to the description of the battery cell 10 in the previous embodiment, which will not be repeated here.

[0218] The battery 100 provided in the embodiment of the present application can improve the problem of separator melting of the battery cell 10 by adopting the battery cell 10 involved above, thereby reducing the risk of short circuit of the battery 100.

[0219] Based on the above concept, referring to FIG1 , an embodiment of the present application further provides an electrical device, comprising a battery cell 10 or a battery 100. The battery cell 10 and battery 100 in this embodiment are the same as those in the previous embodiment. For details, please refer to the description of the battery cell 10 and battery 100 in the previous embodiment, which will not be repeated here.

[0220] The electrical device provided in the embodiment of the present application can improve the problem of diaphragm melting of the battery cell 10 by adopting the above-mentioned battery cell 10 or battery 100, thereby reducing the risk of short circuit of the battery 100.

[0221] As one embodiment of the present application, as shown in Figures 3 to 7, a battery cell 10 includes an electrode assembly 11, a first electrode terminal 13a, a second electrode terminal 13b, a first adapter 14a, a second adapter 14b, and a first thermal insulator 151. The electrode assembly 11 includes a main body 111, a first electrode tab 112a, and a second electrode tab 112b. The first electrode tab 112a and the second electrode tab 112b are disposed at one end or opposite ends of the main body 111 along a first direction Y. The first adapter 14a is welded to the first electrode terminal 13a, and the first adapter 14a is welded to the first electrode tab 112a. The second adapter 14b is welded to the second electrode terminal 13b, and the second adapter 14b is welded to the second electrode tab 112b. The first thermal insulator 151 is disposed on the side of the first adapter 14a facing the main body 111 along the first direction Y. The first thermal insulator 151 avoids the weld marks between the first electrode tab 112a and the first adapter 14a. The first electrode tab 112a and the first adapter 14a are welded to form multiple weld marks spaced apart from each other. The second electrode tab 112b and the second adapter 14b are welded to form multiple weld marks, with at least a portion of the second electrode terminal 13b positioned between the weld marks.

[0222] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A battery cell (10), wherein: include: An electrode assembly (11) comprises a main body (111) and a first electrode tab (112a) provided on the main body (111); A first electrode terminal (13a); A first adapter (14a) conductively connected to the first electrode tab (112a) and the first electrode terminal (13a); The heat insulation structure (15) is at least partially disposed on a side of the first adapter (14a) facing the main body (111).

2. The battery cell (10) according to claim 1, wherein: The thermal conductivity of the thermal insulation structure (15) is ≤0.7 W / m·K.

3. The battery cell (10) according to claim 1 or 2, wherein: The heat insulation structure (15) has insulating properties.

4. The battery cell (10) according to any one of claims 1 to 3, wherein: The thermal insulation structure (15) comprises one or more of a copolymer of perfluoropropyl vinyl ether and polytetrafluoroethylene, mica, ceramics, glass fiber, carbon fiber, carbon-carbon composite material or pre-oxidized silk aerogel.

5. The battery cell (10) according to any one of claims 1 to 4, wherein: The heat insulation structure (15) is a coating layer.

6. The battery cell (10) according to any one of claims 1 to 5, wherein: The first adapter (14a) is provided with a first position (1401), the first pole ear (112a) is connected to the first position (1401), and the heat insulation structure (15) is arranged to avoid the first position (1401).

7. The battery cell (10) according to claim 6, wherein: The first adapter (14a) is provided with a plurality of first positions (1401) distributed at intervals, and the first pole lug (112a) is connected to the plurality of first positions (1401).

8. The battery cell (10) according to claim 6 or 7, wherein: The battery cell (10) further comprises a shell (12), wherein the electrode assembly (11), the first adapter (14a) and the heat insulation structure (15) are all arranged in the shell (12); the shell (12) is provided with a liquid injection hole (1201), and the first position (1401) is located on a side of the first electrode terminal (13a) away from the liquid injection hole (1201).

9. The battery cell (10) according to claim 8, wherein: The housing (12) is provided with a first wall (122a), and the liquid injection hole (1201) and the first electrode terminal (13a) are spaced apart from each other on the first wall (122a).

10. The battery cell (10) according to any one of claims 6 to 9, wherein: The first pole lug (112a) includes a plurality of first sub-pole lugs, and the plurality of first sub-pole lugs are connected to form a first connection structure (1121a), and at least a portion of the first connection structure (1121a) is connected to the first position (1401).

11. The battery cell (10) according to any one of claims 6 to 10, wherein: The area of ​​all the first positions (1401) accounts for 10% to 25% of the area of ​​the side of the first adapter (14a) facing the main body (111).

12. The battery cell (10) according to any one of claims 1 to 11, wherein: The first adapter (14a) is provided with a positioning through hole (1403), the first electrode terminal (13a) is inserted into the positioning through hole (1403), and part of the heat insulation structure (15) is provided on a side of the first electrode terminal (13a) facing the main body (111).

13. The battery cell (10) according to any one of claims 1 to 12, wherein: The electrode assembly (11) further comprises a second pole lug (112b) provided on the main body (111); the battery cell (10) further comprises a second electrode terminal (13b) and a second adapter (14b), wherein the second adapter (14b) is conductively connected to the second pole lug (112b) and the second electrode terminal (13b).

14. The battery cell (10) according to claim 13, wherein: The first pole lug (112a) is a positive pole lug, and the second pole lug (112b) is a negative pole lug.

15. The battery cell (10) according to claim 13 or 14, wherein: Part of the heat insulation structure (15) is arranged on a side of the second adapter (14b) facing the main body (111).

16. The battery cell (10) according to any one of claims 13 to 15, wherein: The second adapter (14b) is provided with a second position (1402), the second pole ear (112b) is connected to the second position (1402), and the heat insulation structure (15) is arranged to avoid the second position (1402).

17. The battery cell (10) according to claim 16, wherein: The second adapter (14b) is provided with a plurality of second positions (1402) distributed at intervals, and the second pole tab (112b) is connected to the plurality of second positions (1402).

18. The battery cell (10) according to claim 17, wherein: At least a portion of the second electrode terminal (13b) is located between the two second locations (1402).

19. The battery cell (10) according to any one of claims 16 to 18, wherein: The second pole tab (112b) includes a plurality of second sub-pole tabs, and the plurality of second sub-pole tabs are connected to form a second connection structure (1121b), and at least a portion of the second connection structure (1121b) is connected to the second position (1402).

20. The battery cell (10) according to claim 19, wherein: A plurality of the second sub-electrode ears are connected to form a plurality of the second connection structures (1121b) distributed at intervals, and each of the second connection structures (1121b) is connected to a corresponding second position (1402).

21. The battery cell (10) according to any one of claims 16 to 20, wherein: The area of ​​all the second positions (1402) accounts for 10% to 25% of the area of ​​the side of the second adapter (14b) facing the main body (111).

22. The battery cell (10) according to any one of claims 13 to 21, wherein: The battery cell (10) further comprises a housing (12), wherein the electrode assembly (11), the first adapter (14a), the second adapter (14b) and the heat insulation structure (15) are all arranged in the housing (12); The first pole lug (112a) and the second pole lug (112b) are respectively arranged at the opposite ends of the main body (111) along the first direction (Y); the shell (12) is respectively provided with a first wall (122a) and a second wall (122b) at the opposite ends along the first direction (Y); the first electrode terminal (13a) is arranged on the first wall (122a), and the second electrode terminal (13b) is arranged on the second wall (122b); along the first direction (Y), the first adapter (14a) is arranged between the first wall (122a) and the first pole lug (112a), and the second adapter (14b) is arranged between the second wall (122b) and the second pole lug (112b).

23. A battery (100), wherein: Comprising a battery cell (10) according to any one of claims 1 to 22.

24. An electrical device, wherein: Comprising the battery cell (10) according to any one of claims 1 to 22; or comprising the battery (100) according to claim 23.

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