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 a battery (100). The battery (100) comprises a battery cell (10). The battery cell (10) comprises a casing (12), an electrode assembly (11), an electrode terminal (13), an adapter (14), and an insulating member (15). The electrode assembly (11) is disposed in the casing (12). The adapter (14) is disposed in the casing (12) and is electrically connected to the electrode assembly (11) and the electrode terminal (13). The insulating member (15) is disposed in the casing (12) and at least part of the insulating member (15) is located between the adapter (14) and the casing (12). At least part of the insulating member (15) is spaced apart from the adapter (14). By arranging at least part of the insulating member (15) and the adapter (14) spaced apart, the problem that the insulating performance of the insulating member (15) fails due to the fact that heat of the adapter (14) is transferred to the insulating member (15) can be alleviated.

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 202311017397.0 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 a housing, an electrode assembly, electrode terminals, an adapter, and an insulator. The electrode assembly, adapter, and insulator are all housed within the housing, with the electrode terminals located within the housing. The adapter is welded to the electrode assembly's tabs and electrode terminals, respectively, to achieve electrical conductivity between the electrode assembly and the electrode terminals. The insulator provides insulation between the adapter and the housing, and between the electrode assembly and the housing.

[0005] In some cases, heat will be generated when the adapter is overcurrent, when the adapter and the tab are welded, or when the adapter and the electrode terminal are welded. This heat will be conducted to the insulating part, and there is a risk that the insulating part will melt and the insulating performance of the insulating part will fail.

[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 of insulation failure caused by melting of the insulation parts.

[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] shell;

[0011] an electrode assembly disposed in the housing;

[0012] an electrode terminal, disposed on the housing;

[0013] The adapter is disposed in the housing and is conductively connected to the electrode assembly and the electrode terminal;

[0014] The insulating component is disposed in the housing and at least partially located between the housing and the adapter. At least a portion of the insulating component is spaced apart from the adapter.

[0015] The battery cell provided in the embodiment of the present application can slow down the heat conduction between the adapter and the insulating part by distributing at least part of the insulating part at intervals from the adapter, thereby improving the problem of heat from the adapter being conducted to the insulating part, causing the insulating performance of the insulating part to fail. In this way, the insulating part can achieve a good insulation effect between the adapter and the shell.

[0016] In some embodiments, the adapter is disposed at the end of the electrode assembly along the first direction; the insulating member includes a main body portion, which is located between the adapter and the shell along the first direction and is spaced apart from the adapter along the first direction.

[0017] Such a configuration enables the insulating member to achieve insulation between the housing and the adapter, and the main body of the insulating member can also be spaced apart from the adapter to slow down the conduction of heat between the adapter and the main body, thereby improving the problem of insulation failure of the main body.

[0018] In some embodiments, the insulating member further includes a first boss, which is disposed on a side of the main body along the first direction facing the electrode assembly; the adapter and the first boss are spaced apart along the second direction, and the second direction intersects the first direction.

[0019] By adopting the above technical solution, the adapter is not only spaced apart from the main body of the insulating part, but also spaced apart from the first boss of the insulating part. This can better slow down the conduction of heat between the adapter and the insulating part, so as to improve the problem of the heat of the adapter causing the insulation performance of the insulating part to fail, specifically including the problem of the insulation performance failure of the main body of the insulating part and the insulation performance failure of the first boss.

[0020] In some embodiments, a liquid injection hole is opened on the wall of the shell along the first direction, and the insulating part also includes a protrusion, which is arranged on the side of the main body along the first direction facing the electrode assembly; the protrusion is connected to the liquid injection hole and is connected to the inside of the shell; the adapter and the protrusion are spaced apart along the second direction, and the second direction intersects with the first direction.

[0021] By adopting the above technical solution, the adapter is not only spaced apart from the main body of the insulating part, but also spaced apart from the protrusion of the insulating part. This can better slow down the conduction of heat between the adapter and the insulating part, so as to improve the problem of the insulation performance of the insulating part being invalidated due to the heat of the adapter.

[0022] In some embodiments, a gap formed between at least a portion of the insulating member and the transition member is greater than 0.1 mm.

[0023] Such an arrangement allows a larger gap to be formed between at least part of the insulating member and the adapter, thereby slowing down the conduction of heat between the adapter and the insulating member, and thus facilitating improvement of the problem of insulation failure of the insulating member caused by heat from the adapter.

[0024] In some embodiments, a gap formed between at least a portion of the insulating member and the transition member is smaller than 2 mm.

[0025] In this way, on the basis of improving the problem of heat of the adapter causing the insulation performance of the insulating part to fail, the distribution compactness of the adapter and the insulating part can also be improved, thereby helping to achieve the structural compactness of the battery cell and improve the energy density of the battery cell.

[0026] In some embodiments, the electrode assembly is welded to the adapter.

[0027] By welding the electrode assembly and the adapter, a conductive connection between the electrode assembly and the adapter can be achieved, thereby realizing the connection between the electrode assembly and the electrode terminal.

[0028] In some embodiments, the adapter is configured to be spaced apart from the insulating member at the position of the electrode assembly.

[0029] By spacing the portion of the adapter used for welding to the electrode assembly from the insulating member, the speed at which heat generated by the electrode assembly and the adapter during welding is transferred to the insulating member can be slowed down, thereby improving the problem of insulation failure of the insulating member.

[0030] In some embodiments, the adapter is provided with a positioning hole, and the electrode terminal is inserted into the positioning hole.

[0031] By inserting the electrode terminal into the positioning hole, the electrode terminal is easily positioned on the battery cell, and the conductive connection between the electrode terminal and the adapter is also easily achieved.

[0032] In some embodiments, the electrode assembly is welded to the adapter, and weld marks formed by welding the electrode assembly and the adapter are spaced apart from the positioning holes.

[0033] Such a setting can improve the problem of solder used in the welding process of the tab and the adapter flowing into the positioning hole, and further improve the problem that the welding process of the tab and the adapter will interfere with the positioning function of the positioning hole on the electrode terminal, thereby facilitating the assembly of the battery cell.

[0034] In some embodiments, the electrode assembly includes a main body and a pole ear provided on the main body; the pole ear includes a plurality of sub-pole ears, the plurality of sub-pole ears are welded to form a first weld mark, at least a portion of the first weld mark is welded to the adapter to form a second weld mark, and the second weld mark is spaced apart from the positioning hole.

[0035] This can alleviate the problem of solder flowing into the positioning holes during the tab-to-adapter welding process, thereby improving the problem of the positioning holes interfering with the electrode terminal positioning function during the tab-to-adapter welding process, thereby facilitating battery cell assembly. Furthermore, the first weld mark formed by welding the multiple sub-tabs of the tab facilitates the tab-to-adapter welding operation.

[0036] In some embodiments, a plurality of sub-tabs are welded and welded to the adapter to form a first weld mark, and the first weld mark is spaced apart from the positioning hole.

[0037] This arrangement allows the multiple tabs to be welded to the adapter during the welding process, increasing the number of tab-to-adapter welds and improving the conductive strength between the adapter and the tab. Furthermore, the first weld marks are spaced apart from the positioning holes, making it difficult for solder to flow into the positioning holes during the welding process. This alleviates the problem of the tab-to-adapter welding process interfering with the positioning holes' function of locating the electrode terminals, thereby facilitating assembly of the battery cells.

[0038] In some embodiments, the minimum distance between the weld mark formed by welding the electrode assembly and the adapter and the positioning hole is 0.2 to 6 mm.

[0039] This arrangement ensures that the minimum spacing between the weld mark formed by welding the electrode assembly to the adapter and the positioning hole falls within an appropriate range. This, on the one hand, can alleviate the problem of solder flowing into the positioning hole during welding, thereby alleviating the problem of the welding process of the electrode assembly and the adapter interfering with the positioning operation of the positioning hole on the electrode terminal. On the other hand, the weld mark, positioning hole, etc. formed by welding the electrode assembly to the adapter can be compactly distributed on the adapter, thereby reducing the size of the adapter.

[0040] In some embodiments, the electrode assembly includes a main body and a tab provided on the main body; the tab includes a first tab, the electrode terminal includes a first electrode terminal, the adapter includes a first adapter, and the insulating member includes a first insulating member; the first adapter is conductively connected to the first tab and the first electrode terminal, at least a portion of the first insulating member is located between the first adapter and the housing, and at least a portion of the first insulating member is spaced apart from the first adapter;

[0041] The first adapter is conductively connected to the first tab to form a plurality of first connection portions distributed at intervals.

[0042] This, on the one hand, makes the current distribution between the first adapter and the first tab more uniform, thereby reducing the overcurrent temperature of the first adapter, thereby alleviating the problem of heat concentration caused by current concentration in the first adapter, and further alleviating the problem of excessive heat in the first adapter causing insulation failure of the insulating member. On the other hand, it can provide a greater overcurrent capacity between the first adapter and the first tab.

[0043] In some embodiments, the housing is provided with a liquid injection hole, and the plurality of first connection portions are provided on a side of the first electrode terminal away from the liquid injection hole.

[0044] Since the first connecting portion is located on the side of the first electrode terminal away from the liquid injection hole, the first adapter can be arranged as far away from the liquid injection hole as possible, so that the first adapter will not interfere with the operation of the liquid injection hole.

[0045] In some embodiments, a first wall is provided on one side of the housing along the first direction, and the first electrode terminal and the liquid injection hole are spaced apart from each other on the first wall.

[0046] The first electrode terminal and the liquid injection hole are arranged on the same wall of the shell along the first direction, which helps to improve the structural compactness of the battery cell.

[0047] In some embodiments, the first tab includes a plurality of first sub-tabs, the plurality of first sub-tabs are connected to form a second connection portion, and at least a portion of the second connection portion is conductively connected to the first adapter to form the first connection portion.

[0048] Such an arrangement enables the first tab to be better conductively connected to the first adapter.

[0049] In some embodiments, the electrode tab further includes a second electrode tab, the electrode terminal further includes a second electrode terminal, the adapter further includes a second adapter, and the insulating member further includes a second insulating member; the second adapter is conductively connected to the second electrode tab and the second electrode terminal, at least a portion of the second insulating member is located between the second adapter and the outer shell, and at least a portion of the second insulating member is spaced apart from the second adapter.

[0050] Such an arrangement enables an insulating member to be provided between each adapter and the housing, thereby achieving insulation between each adapter and the housing.

[0051] In some embodiments, the electrode tab further includes a second electrode tab, the electrode terminal further includes a second electrode terminal, the adapter further includes a second adapter, and the second adapter is conductively connected to the second electrode tab and the second electrode terminal; the second electrode tab is conductively connected to the second adapter to form a plurality of spaced-apart third connection portions.

[0052] 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, thereby improving the problem of heat concentration caused by current concentration in the second adapter, and further improving the problem of excessive heat in the second adapter causing insulation failure of the insulating member. On the other hand, it can provide a greater overcurrent capacity between the second adapter and the second tab.

[0053] In some embodiments, at least a portion of the second electrode terminal is located between the two third connection portions.

[0054] This arrangement allows the multiple locations of the second adapter for connecting to the second tab to be more dispersed, making 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 insulation performance of the insulating member to fail.

[0055] In some embodiments, the second tab includes a plurality of second sub-tabs, the plurality of second sub-tabs are connected to form a fourth connection portion, and at least a portion of the fourth connection portion is conductively connected to the second adapter to form a third connection portion.

[0056] Such an arrangement enables the second tab to be better conductively connected to the second adapter.

[0057] In some embodiments, the plurality of second sub-tabs are connected to form a plurality of spaced-apart fourth connection portions, and at least a portion of each fourth connection portion is conductively connected to the second adapter to form a corresponding third connection portion.

[0058] A plurality of spaced-apart fourth connection portions are formed by connecting the second sub-pole ears, so that each fourth connection portion is conductively connected to the second adapter to form a corresponding third connection portion, so that the current between the second adapter and the second pole ear can be distributed more evenly, thereby reducing the overcurrent temperature of the second adapter, thereby reducing the risk of the second adapter causing the insulation performance of the insulating component to fail.

[0059] In a second aspect, an embodiment of the present application provides a battery comprising a battery cell.

[0060] The battery provided in the embodiment of the present application adopts the battery cells involved above, and by distributing at least a portion of the insulating part and the adapter at intervals, it can slow down the heat conduction between the adapter and the insulating part, and thus improve the problem of heat from the adapter being conducted to the insulating part, causing the insulating performance of the insulating part to fail. In this way, the insulating part can achieve a good insulation effect between the adapter and the shell, so that the battery has higher reliability.

[0061] In a third aspect, an embodiment of the present application provides an electrical device including a battery cell or a battery.

[0062] The electrical device provided in the embodiment of the present application adopts the battery cell or battery involved above, and by distributing at least a portion of the insulating part and the adapter at intervals, it can slow down the heat conduction between the adapter and the insulating part, and thus improve the problem of heat from the adapter being conducted to the insulating part, causing the insulating performance of the insulating part to fail. In this way, the insulating part can achieve a good insulation effect between the adapter and the shell, so that the battery cell or battery has higher reliability.

[0063] 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

[0064] 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.

[0065] FIG1 is a schematic diagram of a vehicle provided in some embodiments of the present application;

[0066] FIG2 is an exploded schematic diagram of a battery provided in some embodiments of the present application;

[0067] FIG3 is a cross-sectional view of a battery cell provided in some embodiments of the present application;

[0068] FIG4 is an enlarged view of point A in FIG3 ;

[0069] FIG5 is a schematic diagram of the coordination of an end cap and an insulating member of a battery cell according to some embodiments of the present application;

[0070] FIG6 is a top view of the first adapter and the end cover of the battery cell provided in FIG3 ;

[0071] FIG. 7 is a schematic diagram of a second adapter of the battery cell provided in FIG. 3 .

[0072] In the figures, the following reference numerals are used: 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 part; 1122a-second connecting part; 112b-second ear; 1121b-third connecting part; 1122b-fourth connecting part; 12-housing; 1201-injection hole; 121-housing; 122-end cover; 122a-first wall; 122b-second wall; 13-electrode terminal; 13a-first electrode terminal; 13b-second electrode terminal Two electrode terminals; 14-adapter; 1401-positioning hole; 14a-first adaptor; 14b-second adaptor; 15-insulating member; 1501-through hole; 15a-first insulating member; 15b-second insulating member; 151-main body; 152-first boss; 153-boss; 154-second boss; H1-first gap; H2-second gap; H3-third gap; H4-first spacing; H5-second spacing; Z-first direction; X-second direction; Y-third direction. DETAILED DESCRIPTION

[0073] 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.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] In related art, a battery cell typically includes a housing, an electrode assembly, electrode terminals, and an adapter. The electrode assembly and adapter are both located within the internal environment defined by the housing, and the electrode terminals are located within the housing. 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.

[0081] In addition, the battery cell further includes an insulating member disposed in the shell. The insulating member can be used to at least achieve insulation between the adapter and the shell, and can also be used to achieve insulation between the electrode assembly and the shell.

[0082] In some cases, overcurrent in the adapter generates heat, which can be transferred to the insulation. Consequently, overtime use of the battery cell can lead to the risk of the insulation melting and causing insulation failure. In particular, when a battery cell shorts, the current flowing through the adapter increases dramatically, releasing energy rapidly. This causes a sharp increase in temperature within the adapter, which can easily transfer heat to the insulation, causing insulation failure and ultimately leading to a short circuit within the battery cell.

[0083] In some cases, during welding operations such as welding the adapter to the tab, or welding the adapter to the electrode terminal, a large amount of heat will be generated. This heat will be transferred to the insulating part, and there is a risk that the insulating part will be melted, causing the insulating performance of the insulating part to fail, which will in turn cause a short circuit inside the battery cell.

[0084] Therefore, the heat on the adapter will be transferred to the insulating member, so that the insulating member may be melted by the adapter, resulting in a risk of insulation failure.

[0085] Based on the above considerations, the embodiments of the present application provide a battery cell, a battery and an electrical device. By distributing at least a portion of the insulating part and the adapter at intervals, the heat conduction between the adapter and the insulating part can be slowed down, thereby improving the problem of heat on the adapter being conducted to the insulating part, causing the insulating performance of the insulating part to fail. In this way, the insulating part can achieve a good insulation effect between the adapter and the outer shell.

[0086] 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.

[0087] 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.

[0088] 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.

[0089] 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.

[0090] 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.

[0091] 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.

[0092] For ease of description, the embodiments of the present application are described using a vehicle as an example of an electrical device.

[0093] 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.

[0094] 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 .

[0095] 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.

[0096] 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.

[0097] 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.

[0098] 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.

[0099] 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 may include an electrode assembly 11 and a housing 12 .

[0100] 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 a positive electrode sheet and a negative electrode sheet, with a separator provided between the positive electrode sheet and the negative electrode sheet. The portions of the positive electrode sheet and the negative electrode sheet containing active materials constitute the main body 111 of the electrode assembly 11, while the portions of the positive electrode sheet and the negative electrode sheet 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 electrode tab and the negative electrode tab may be located together at one end of the main body 111 or at opposite ends of the main body 111.

[0101] In the battery cell 10 , the number of the electrode assembly 11 may be one or more.

[0102] In some cases, the electrode assembly 11 may also be referred to as a bare cell, a wound body, a laminated body, etc.

[0103] 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.

[0104] 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.

[0105] 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 .

[0106] 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.

[0107] In some embodiments, referring to FIG3 , the battery cell 10 may further include an electrode terminal 13 . The electrode terminal 13 is a conductive component that 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 terminal post.

[0108] 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 to facilitate current flow and indirectly achieve electrical connection between the electrode terminal 13 and the tab 112.

[0109] The adapter 14 is a metal structure with conductive properties, such as but not limited to a copper busbar. The adapter 14 is disposed in the housing 12 .

[0110] 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.

[0111] 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.

[0112] 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 .

[0113] In some embodiments, referring to FIG3 , the battery cell 10 may further include a lower plastic. The lower plastic is a plastic component that is mainly used to be disposed in the internal environment of the battery cell 10 to provide insulation.

[0114] The lower plastic is disposed in the housing 12 and at the end of the electrode assembly 11 having the tab 112 , so as to achieve insulation between the housing 12 and the adapter 14 , and also between the housing 12 and the electrode assembly 11 .

[0115] There can be two lower plastics, one of which is disposed on the side of the electrode assembly 11 having the positive electrode tab, and the other lower plastic is disposed on the side of the electrode assembly 11 having the negative electrode tab.

[0116] The lower plastic can be connected to the outer shell 12. Specifically, the lower plastic can be connected to the shell 121 of the outer shell 12, and can also be connected to the end cover 122 of the outer shell 12.

[0117] Please refer to Figures 3 and 4 together, and in conjunction with other drawings. Among them, Figure 4 is an enlarged view of point A in Figure 3. The enlarged view of Figure 4 mainly illustrates the relationship between the first wall 122a, the first pole ear 112a, the first insulating member 15a, and the first adapter 14a involved below. The battery cell 10 provided in the embodiment of the present application includes a shell 12, an electrode assembly 11, an electrode terminal 13, an adapter 14 and an insulating member 15. The electrode assembly 11 is disposed in the shell 12. The adapter 14 is disposed in the shell 12, and the adapter 14 is conductively connected to the electrode assembly 11 and the electrode terminal 13. The insulating member 15 is disposed in the shell 12, and at least a portion of the insulating member 15 is located between the adapter 14 and the shell 12, and at least a portion of the insulating member 15 is spaced apart from the adapter 14.

[0118] The adapter 14 is conductively connected to the electrode assembly 11 and the electrode terminal 13, which means that the adapter 14 is conductively connected to the electrode assembly 11, and the adapter 14 is conductively connected to the electrode terminal 13. The adapter 14 is conductively connected to the electrode assembly 11, which means that the adapter 14 is connected to the electrode assembly 11, and the adapter 14 and the electrode assembly 11 are electrically conductive. The adapter 14 is conductively connected to the electrode terminal 13, which means that the adapter 14 is connected to the electrode terminal 13, and the adapter 14 and the electrode terminal 13 are electrically conductive. Based on this, the adapter 14 can achieve overcurrent between the electrode assembly 11 and the electrode terminal 13. Among them, the conductive connection method may include but is not limited to one or more of welding, bonding, etc. Welding may include but is not limited to one or more of laser welding, ultrasonic welding, penetration welding, etc.

[0119] As shown in FIG. 3 , the electrode assembly 11 includes a main body 111 and a tab 112 provided on the main body 111 . The adapter 14 is conductively connected to the tab 112 of the electrode assembly 11 .

[0120] The insulating member 15 is a component used to achieve insulation between the housing 12 and the adapter 14. The insulating member 15 can be a plastic member, such as the lower plastic member mentioned above. The insulating member 15 can also be a structural member made of other materials with insulating properties.

[0121] At least a portion of the insulating member 15 is located between the adapter 14 and the housing 12 , so that at least a portion of the insulating member 15 can separate the adapter 14 and the housing 12 , thereby achieving insulation between the adapter 14 and the housing 12 .

[0122] As shown in Figures 3 and 4 , at least a portion of insulating member 15 is located between the wall of housing 12 along the first direction Z and adapter 14 , so that at least a portion of insulating member 15 can separate adapter 14 from the wall of housing 12 along the first direction Z, thereby achieving insulation between adapter 14 and housing 12. Figures 3 and 4 illustrate a plane coordinate system, where the X-axis and the Z-axis are two mutually perpendicular coordinate axes in the plane coordinate system, i.e., the Z-axis is perpendicular to the X-axis. The first direction Z is parallel to the Z-axis.

[0123] In some possible designs, as shown in Figures 3 and 4, the adapter 14 is disposed between the wall of the housing 12 along the first direction Z and the electrode assembly 11. In other possible designs, the adapter 14 may also be disposed between the wall of the housing 12 along a direction intersecting the first direction Z and the electrode assembly 11.

[0124] 3 and 4 , the electrode terminal 13 is disposed on a wall of the housing 12 along the first direction Z. In other possible designs, the electrode terminal 13 may also be disposed on a wall of the housing 12 along a direction intersecting the first direction Z.

[0125] The wall of the housing 12 along the first direction Z can be a shell 121 or an end cap 122. As shown in FIG3 , two opposing walls of the housing 12 along the first direction Z can both be end caps 122; alternatively, two opposing walls of the housing 12 along the first direction Z can both be shells 121; alternatively, one wall of the housing 12 along the first direction Z can be the shell 121, and the other wall can be the end cap 122.

[0126] As shown in FIG3 , there are two tabs 112 , namely a first tab 112 a and a second tab 112 b . As an example, the first tab 112 a is the positive tab and the second tab 112 b is the negative tab. Alternatively, the first tab 112 a may be the negative tab and the second tab 112 b may be the positive tab.

[0127] In some cases, the first direction Z is a length direction or a height direction of the battery cell 10 .

[0128] It should be noted that the battery cell 10 includes electrode terminals 13, adapters 14, and insulating members 15, which means that the battery cell 10 includes at least one electrode terminal 13, at least one adapter 14, and at least one insulating member 15. It is understood that the number of electrode terminals 13, the number of adapters 14, and the number of insulating members 15 may include, but are not limited to, the following three situations: First, the number of electrode terminals 13, the number of adapters 14, and the number of insulating members 15 are all one; Second, as shown in Figures 3 and 4, the number of electrode terminals 13, the number of adapters 14, and the number of insulating members 15 are all two; Third, the number of electrode terminals 13 and the number of adapters 14 are all two, and the number of insulating member 15 is one.

[0129] When the number of electrode terminals 13, adapters 14, and insulating members 15 is the same, electrode terminal 13 may be a first electrode terminal 13a, adapter 14 may be a first adapter 14a, and insulating member 15 may be a first insulating member 15a. First adapter 14a is electrically connected to first tab 112a, and first adapter 14a is electrically connected to first electrode terminal 13a. At least a portion of first insulating member 15a is located between first adapter 14a and a wall of housing 12 along first direction Z, thereby providing insulation between first adapter 14a and housing 12. Electrode terminal 13 may also be a second electrode terminal 13b, in which case adapter 14 is a second adapter 14b, and insulating member 15 is a second insulating member 15b. The second adapter 14b is conductively connected to the second electrode tab 112b, and the second adapter 14b is conductively connected to the second electrode terminal 13b, and at least a portion of the second insulating member 15b is located between the second adapter 14b and the wall of the outer shell 12 along the first direction Z to achieve insulation between the outer shell 12 and the second adapter 14b.

[0130] When the number of electrode terminals 13, adapters 14, and insulating members 15 is two, as shown in Figures 3 and 4, the two electrode terminals 13 are respectively a first electrode terminal 13a and a second electrode terminal 13b, the two adapters 14 are respectively a first adapter 14a and a second adapter 14b, and the two insulating members 15 are respectively a first insulating member 15a and a second insulating member 15b. The first adapter 14a is electrically connected to the first electrode tab 112a, and the first adapter 14a is electrically connected to the first electrode terminal 13a. The second adapter 14b is electrically connected to the second electrode tab 112b, and the second adapter 14b is electrically connected to the second electrode terminal 13b. At least a portion of the first insulating member 15a is located between the first adapter 14a and the wall of the housing 12 along the first direction Z to achieve insulation between the first adapter 14a and the housing 12. At least a portion of the second insulating member 15 b is located between the second transition member 14 b and the wall of the housing 12 along the first direction Z, so as to achieve insulation between the housing 12 and the second transition member 14 b.

[0131] When the number of electrode terminals 13 and the number of adapters 14 are both two, and the number of insulating members 15 is one, the two electrode terminals 13 are respectively the first electrode terminal 13a and the second electrode terminal 13b, and the two adapters 14 are respectively the first adapter 14a and the second adapter 14b. The first adapter 14a is conductively connected to the first electrode tab 112a, and the first adapter 14a is conductively connected to the first electrode terminal 13a. The second adapter 14b is conductively connected to the second electrode tab 112b, and the second adapter 14b is conductively connected to the second electrode terminal 13b. The insulating member 15 can be a first insulating member 15a, at least a portion of which is located between the first adapter 14a and the wall of the outer shell 12 along the first direction Z to achieve insulation between the first adapter 14a and the outer shell 12. The insulating member 15 may also be a second insulating member 15 b , at least part of which is located between the second transition member 14 b and the wall of the housing 12 along the first direction Z, so as to achieve insulation between the housing 12 and the second transition member 14 b .

[0132] It should be supplemented that the walls of the housing 12 along the first direction Z include a first wall 122 a and a second wall 122 b .

[0133] At least part of the first insulating member 15a is located between the outer shell 12 and the first adapter 14a, which means that at least part of the first insulating member 15a is located between the wall of the outer shell 12 along the first direction Z and the first adapter 14a, that is, at least part of the first insulating member 15a is located between the first wall 122a and the first adapter 14a along the first direction Z.

[0134] At least a portion of the second insulating member 15b is located between the outer shell 12 and the second adapter 14b, which means that at least a portion of the second insulating member 15b is located between the wall of the outer shell 12 along the first direction Z and the second adapter 14b, that is, at least a portion of the second insulating member 15b is located between the second wall 122b and the second adapter 14b along the first direction Z.

[0135] The first wall 122a can be provided on the housing 121 or the end cover 122. The second wall 122b can be provided on the housing 121 or the end cover 122. As an example, as shown in FIG3 , both the first wall 122a and the second wall 122b are provided on the end cover 122.

[0136] In some possible designs, as shown in FIG3 , the first wall 122a and the second wall 122b mentioned above may be two opposing walls of the housing 12 along the first direction Z. Based on this, the first electrode tab 112a and the second electrode tab 112b are respectively disposed at opposite ends of the electrode assembly 11 along the first direction Z, the first adapter 14a and the second adapter 14b are also respectively disposed at opposite ends of the electrode assembly 11 along the first direction Z, the first insulating member 15a and the second insulating member 15b are also respectively disposed at opposite ends of the electrode assembly 11 along the first direction Z, and the first electrode terminal 13a and the second electrode terminal 13b are also respectively disposed at opposite ends of the electrode assembly 11 along the first direction Z. Furthermore, at least a portion of the first insulating member 15a is located between the first wall 122a and the first adapter 14a along the first direction Z, and at least a portion of the second insulating member 15b is located between the second wall 122b and the second adapter 14b along the first direction Z.

[0137] In some other possible designs, the first wall 122a and the second wall 122b may be the same wall of the housing 12 along the first direction Z. Based on this, the first electrode tab 112a and the second electrode tab 112b are disposed at the same end of the electrode assembly 11 along the first direction Z, the first adapter 14a and the second adapter 14b are also disposed at the same end of the electrode assembly 11 along the first direction Z, the first insulating member 15a and the second insulating member 15b are also disposed at the same end of the electrode assembly 11 along the first direction Z, and the first electrode terminal 13a and the second electrode terminal 13b are also disposed at the same end of the electrode assembly 11 along the first direction Z.

[0138] At least a portion of the insulating member 15 is spaced apart from the adapter 14, meaning that at least a portion of the insulating member 15 is separated from the adapter 14 and does not directly contact the adapter 14. The space formed between at least a portion of the insulating member 15 and the adapter 14 can be filled with air or other components of the battery cell 10.

[0139] At least a portion of the insulating member 15 is spaced apart from the adapter 14 , which may include a situation where the entire insulating member 15 is completely spaced apart from the adapter 14 ; or a situation where a portion of the insulating member 15 is spaced apart from the adapter 14 and another portion of the insulating member 15 is in contact with the adapter 14 .

[0140] The battery cell 10 provided in the embodiment of the present application can slow down the heat conduction between the adapter 14 and the insulating part 15 by distributing at least a portion of the insulating part 15 at intervals from the adapter 14, thereby improving the problem of heat from the adapter 14 being conducted to the insulating part 15, causing the insulating performance of the insulating part 15 to fail. In this way, the insulating part 15 can achieve a good insulation effect between the adapter 14 and the shell 12.

[0141] It is understandable that the adapter 14 involved in each embodiment of the present application can be the first adapter 14a or the second adapter 14b; the tab 112 can be the first tab 112a or the second tab 112b; the electrode terminal 13 can be the first electrode terminal 13a or the second electrode terminal 13b; and the insulating member 15 can be the first insulating member 15a or the second insulating member 15b. Furthermore, when the tab 112 is the first tab 112a, the electrode terminal 13 is the first electrode terminal 13a, the adapter 14 is the first adapter 14a, and the insulating member 15 is the first insulating member 15a; when the tab 112 is the second tab 112b, the electrode terminal 13 is the second electrode terminal 13b, the adapter 14 is the second adapter 14b, and the insulating member 15 is the second insulating member 15b.

[0142] In some embodiments, as shown in FIG3 , the first electrode terminal 13 a is disposed on the first wall 122 a , and the second electrode terminal 13 b is disposed on the second wall 122 b .

[0143] In some embodiments, referring to Figures 3 and 4 , at least a portion of the insulating member 15 may be located between the wall of the housing 12 along the first direction Z and the electrode assembly 11 to separate the electrode assembly 11 from the wall of the housing 12 along the first direction Z. In this way, the insulating member 15 can also provide insulation between the electrode assembly 11 and the housing 12.

[0144] In some embodiments, referring to Figures 3 and 4 in conjunction with other figures, the adapter 14 is disposed at an end of the electrode assembly 11 along the first direction Z. The insulating member 15 includes a body portion 151. Along the first direction Z, the body portion 151 is located between the adapter 14 and the housing 12 and is spaced apart from the adapter 14 along the first direction Z.

[0145] The main body 151 is a part of the insulating member 15 and also has insulating properties.

[0146] It can be understood that the main body 151 is located between the wall of the housing 12 along the first direction Z and the adapter 14 , so as to achieve insulation between the adapter 14 and the housing 12 .

[0147] Based on the arrangement of the adapter 14 at the end of the electrode assembly 11 along the first direction Z, and the main body 151 being located between the wall of the housing 12 along the first direction Z and the adapter 14, the adapter 14 and the main body 151 are spaced apart along the first direction Z. The adapter 14 is located between the wall of the housing 12 along the first direction Z and the electrode assembly 11, and the electrode assembly 11 is located on a side of the adapter 14 away from the main body 151 along the first direction Z. Based on this, the adapter 14 is located on a side of the main body 151 along the first direction Z that faces the electrode assembly 11.

[0148] The insulating member 15 may be a first insulating member 15a or a second insulating member 15b. That is, both the first insulating member 15a and the second insulating member 15b may include a main body 151.

[0149] It should be noted that, as shown in FIG4 , FIG4 primarily illustrates the positional relationship between the first wall 122a, the first tab 112a, the first insulating member 15a, and the first adapter 14a discussed below. The main body 151 of the first insulating member 15a is located between the wall of the housing 12 along the first direction Z and the first adapter 14a. That is, the main body 151 of the first insulating member 15a is located between the wall of the housing 12 along the first direction Z that is closest to the first adapter 14a and the first adapter 14a. That is, the main body 151 of the first insulating member 15a is located between the first wall 122a of the housing 12 and the first adapter 14a along the first direction Z. Furthermore, the main body 151 of the first insulating member 15a is spaced apart from the first adapter 14a along the first direction Z.

[0150] It should also be noted that the main body 151 of the second insulating member 15b is located between the wall of the housing 12 along the first direction Z and the second adapter 14b. In other words, the main body 151 of the second insulating member 15b is located between the wall of the housing 12 having the second adapter 14b and the second adapter 14b along the first direction Z. In other words, the main body 151 of the second insulating member 15b is located between the second wall 122b of the housing 12 and the second adapter 14b along the first direction Z. Furthermore, the main body 151 of the second insulating member 15b is spaced apart from the second adapter 14b along the first direction Z.

[0151] Such a configuration enables the insulating member 15 to achieve insulation between the housing 12 and the adapter 14, and the main body 151 of the insulating member 15 can also be arranged at intervals from the adapter 14 to slow down the conduction of heat between the adapter 14 and the main body 151, thereby improving the problem of insulation performance failure of the main body 151.

[0152] In some embodiments, please refer to Figures 3 to 5 in conjunction with other figures. Figure 5 is a schematic diagram illustrating the coordination of the end cap 122, first insulating member 15a, and first electrode terminal 13a of a battery cell 10 provided in some embodiments of the present application. The insulating member 15 also includes a first boss 152, which is disposed on a side of the body 151 facing the electrode assembly 11 along the first direction Z. The adapter 14 and the first boss 152 are spaced apart along a second direction X, which intersects the first direction Z.

[0153] The first boss 152 is a component disposed on the side of the main body 151 facing the electrode assembly 11 along the first direction Z. It is part of the insulating member 15 and also has insulating properties. The first boss 152 is used to constrain the separator covering the electrode assembly 11, thereby ensuring the separator's insulation between the electrode assembly 11 and the outer casing 12 to a certain extent.

[0154] It should be noted that, in the first direction Z, the main body 151 of the first insulating member 15a is located between the first wall 122a of the housing 12 and the first adapter 14a, such that the first adapter 14a is located on the side of the main body 151 of the first insulating member 15a that faces the electrode assembly 11 along the first direction Z. Based on this, the first boss 152 of the first insulating member 15a and the first adapter 14a are both located on the side of the main body 151 of the first insulating member 15a that faces the electrode assembly 11 along the first direction Z, and the first boss 152 of the first insulating member 15a and the first adapter 14a are spaced apart along the second direction X.

[0155] It should also be noted that, in the first direction Z, the main body 151 of the second insulating member 15b is located between the second wall 122b of the housing 12 and the second adapter 14b, such that the second adapter 14b is located on the side of the main body 151 of the second insulating member 15b that faces the electrode assembly 11 along the first direction Z. Based on this, the first boss 152 of the second insulating member 15b and the second adapter 14b are both located on the side of the main body 151 of the second insulating member 15b that faces the electrode assembly 11 along the first direction Z, and the first boss 152 of the second insulating member 15b and the first adapter 14a are spaced apart along the second direction X.

[0156] Here, intersecting means non-parallel. The two intersecting directions are non-parallel, meaning they form an angle greater than 0° and less than 180°. The two directions can be perpendicular or non-perpendicular, and can be located on diametrically opposed planes or on the same plane.

[0157] The second direction X refers to a direction that intersects the first direction Z. Specifically, the second direction X intersects the first direction Z, which means that the second direction X is not parallel to the first direction Z, that is, the first direction Z and the second direction X may form an angle greater than 0° and less than 180°. The first direction Z and the second direction X may be perpendicular to each other, or they may not be perpendicular to each other. The first direction Z and the second direction X may be intersecting directions located on the same plane, or they may be directions located on different planes, and the projection of the second direction X on the plane containing the first direction Z may intersect with the first direction Z.

[0158] Figure 5 illustrates a spatial coordinate system, in which the X-axis, Y-axis, and Z-axis are three perpendicular coordinate axes in the spatial coordinate system, i.e., the X-axis is perpendicular to the Y-axis, the X-axis is perpendicular to the Z-axis, and the Y-axis is perpendicular to the Z-axis. The plane coordinate system illustrated in Figures 3 and 4 is the plane coordinate system formed by the X-axis and the Z-axis of the spatial coordinate system in Figure 5.

[0159] As an example, as shown in FIG3 and FIG4 , the second direction X is parallel to the X-axis, that is, the second direction X is perpendicular to the first direction Z.

[0160] By adopting the above-mentioned technical solution, the adapter 14 is not only spaced apart from the main body 151 of the insulating member 15, but also spaced apart from the first boss 152 of the insulating member 15. This can better slow down the conduction of heat between the adapter 14 and the insulating member 15, so as to improve the problem of the heat of the adapter 14 causing the insulation performance of the insulating member 15 to fail, specifically including the insulation performance failure of the main body 151 of the insulating member 15 and the insulation performance failure of the first boss 152.

[0161] In some embodiments, please continue to refer to Figures 3 to 5 in conjunction with other figures. A liquid injection hole 1201 is defined in the wall of the housing 12 along the first direction Z. The insulating member 15 further includes a protrusion 153 disposed on a side of the body 151 facing the electrode assembly 11 along the first direction Z. The protrusion 153 is connected to the liquid injection hole 1201 and to the interior of the housing 12. The adapter 14 and the protrusion 153 are spaced apart along the second direction X, which intersects the first direction Z.

[0162] The injection hole 1201 is an opening provided on the outer shell 12 for allowing electrolyte to enter the internal environment of the battery cell 10. Specifically, the injection hole 1201 is provided on the wall of the outer shell 12 along the first direction Z. The injection hole 1201 can be provided in the shell 121 of the outer shell 12, or in the end cover 122 of the outer shell 12.

[0163] The protrusion 153 is a component disposed on a side of the main body 151 facing the electrode assembly 11 along the first direction Z. It is a part of the insulating member 15 and also has insulating properties.

[0164] As can be understood, the insulating member 15 defines a through hole 1501 extending along the first direction Z through the main body 151 and the protrusion 153 of the insulating member 15. The through hole 1501 communicates with the internal environment of the battery cell 10 and with the injection hole 1201. Furthermore, the injection hole 1201 is used to communicate with the external environment of the battery cell 10. This allows external electrolyte to enter the internal environment of the battery cell 10 through the injection hole 1201 and the through hole 1501, thereby allowing it to soak the electrode assembly 11.

[0165] As shown in FIG. 3 , the injection holes 1201 and the through holes 1501 are sequentially distributed along the first direction Z and are sequentially connected.

[0166] The protrusion 153 has various functions. For example, in some possible designs, the protrusion 153 can be used to buffer the electrolyte passing through the injection hole 1201, thereby improving the problem of excessive electrolyte pressure causing damage to the electrode assembly 11. For example, in some possible designs, the protrusion 153 can be used to guide the electrolyte passing through the injection hole 1201, allowing the electrolyte to enter the electrode assembly 11 more quickly.

[0167] It should be noted that, as shown in Figures 3 to 5, in the first direction Z, the main body 151 is located between the wall of the housing 12 having the adapter 14 along the first direction Z and the adapter 14, so that the adapter 14 is located on the side of the main body 151 facing the electrode assembly 11 along the first direction Z. Based on this, the boss 153 and the adapter 14 are both provided on the side of the main body 151 facing the electrode assembly 11 along the first direction Z, and the boss 153 and the adapter 14 are spaced apart along the second direction X.

[0168] As an example, as shown in Figures 3 to 5, the first electrode tab 112a is a positive electrode tab, and the liquid injection hole 1201 is opened in the wall of the housing 12 having the first insulating member 15a along the first direction Z, that is, the liquid injection hole 1201 is opened in the first wall 122a. The first insulating member 15a also includes a protrusion 153. The protrusion 153 of the first insulating member 15a and the first adapter 14a are both arranged on the side of the main body 151 of the first insulating member 15a facing the electrode assembly 11 along the first direction Z, and the protrusion 153 of the first insulating member 15a and the first adapter 14a are spaced apart along the second direction X.

[0169] By adopting the above technical solution, the adapter 14 is not only spaced apart from the main body 151 of the insulating member 15, but also spaced apart from the protrusion 153 of the insulating member 15. This can better slow down the conduction of heat between the adapter 14 and the insulating member 15, thereby improving the problem of the insulation performance of the insulating member 15 failing due to the heat of the adapter 14.

[0170] It should be supplemented here that, as shown in FIG. 3 to FIG. 5 , the first bosses 152 and the bosses 153 are spaced apart along the second direction X.

[0171] In some embodiments, referring to Figures 3 to 5 , the insulating member 15 may further include a second boss 154 disposed on a side of the body 151 facing the electrode assembly 11 along the first direction Z. Furthermore, in the second direction X, the second boss 154 is disposed at an end of the boss 153 away from the first boss 152 .

[0172] In some embodiments, referring again to FIG. 3 , the wall of the housing 12 along the first direction Z that includes the second insulating member 15b may not have the liquid injection hole 1201, that is, the second wall 122b may not have the liquid injection hole 1201. In this case, the insulating member 15 may not have the protrusion 153 and the second boss 154. That is, the second adapter 14b may have the first boss 152 at one or both opposite ends along the second direction X. In the second direction X, the first bosses 152 at opposite ends of the second adapter 14b are spaced apart from the second adapter 14b along the second direction X.

[0173] It can be understood that at least a portion of the insulating member 15 is spaced apart from the adapter 14, and may include the main body 151 of the insulating member 15 spaced apart from the adapter 14 along the first direction Z, and may also include the first boss 152 of the insulating member 15 spaced apart from the adapter 14 along the second direction X, and may also include the boss 153 of the insulating member 15 spaced apart from the adapter 14 along the second direction X.

[0174] In some embodiments, a portion of the insulating member 15 is spaced apart from the adapter 14. This "portion of the insulating member 15" may include at least one of the body 151, the first boss 152, and the boss 153. Another portion of the insulating member 15 contacts the adapter 14, that is, the insulating member 15 also includes a portion for contacting the adapter 14. The portion of the insulating member 15 for contacting the adapter 14 may contact the adapter 14 along at least one of the first direction Z, the second direction X, and the third direction Y.

[0175] As an example, the portion of the insulating member 15 that is used to contact the adapter 14 can be inserted into the adapter 14 along the first direction Z, and contact the adapter 14 along at least one of the first direction Z, the second direction X, and the third direction Y to achieve positioning between the insulating member 15 and the adapter 14.

[0176] As an example, the portion of the insulating member 15 that contacts the adapter 14 can be located on the side of the adapter 14 along the third direction Y, and contact the adapter 14 along the third direction Y to achieve positioning of the adapter 14 and the insulating member 15 in the third direction Y.

[0177] The third direction Y intersects the first direction Z, and the third direction Y intersects the second direction X. The meaning of the intersection can be referred to the explanation of the intersection of the first direction Z and the second direction X, and will not be repeated here. As an example, the third direction Y is parallel to the Y axis.

[0178] In some embodiments, please continue to refer to FIG3 to FIG5 and other figures. A gap formed between at least a portion of the insulating member 15 and the adapter 14 is greater than 0.1 mm.

[0179] At least a portion of the insulating member 15 is spaced apart from the adapter 14 , and a gap is formed therebetween. The gap is greater than 0.1 mm.

[0180] In some possible designs, the main body 151 of the insulating component 15 and the adapter 14 are spaced apart along the first direction Z to form a first gap H1 , and the first gap H1 is greater than 0.1 mm.

[0181] In some possible designs, the first protrusion 152 of the insulating component 15 and the adapter 14 are spaced apart along the second direction X, and a second gap H2 is formed therebetween. The second gap H2 is greater than 0.1 mm.

[0182] In some possible designs, the protruding pillars 153 of the insulating component 15 and the adapter 14 are spaced apart along the second direction X, and a third gap H3 is formed therebetween. The third gap H3 is greater than 0.1 mm.

[0183] Based on this, the gap formed between at least a portion of the insulating member 15 and the adapter 14 is greater than 0.1 mm, and may include at least one of the above three possible designs.

[0184] Such a configuration allows a larger gap to be formed between at least a portion of the insulating member 15 and the adapter 14, thereby slowing down the conduction of heat between the adapter 14 and the insulating member 15, and further facilitating improvement of the problem of the insulating performance of the insulating member 15 failing due to the heat of the adapter 14.

[0185] In some embodiments, referring to FIG. 3 to FIG. 5 in conjunction with other drawings, a gap formed between at least a portion of the insulating member 15 and the adapter 14 is less than 2 mm.

[0186] It can be understood that the gap formed between at least part of the insulating member 15 and the adapter 14 is greater than 0.1mm and less than 2mm, and can be 0.2mm, 0.5mm, 0.8mm, 1mm, 1.2mm, 1.4mm, 1.5mm, 1.8mm, 1.9mm, etc.

[0187] In some possible designs, the first gap H1 is less than 2 mm.

[0188] In some possible designs, the second gap H2 is less than 2 mm.

[0189] In some possible designs, the third gap H3 is less than 2 mm.

[0190] Based on this, the gap formed between at least a portion of the insulating member 15 and the adapter 14 is smaller than 2 mm, and may include at least one of the above three possible designs.

[0191] This arrangement allows for a relatively large, but not excessive, gap between at least a portion of the insulating member 15 and the adapter 14. This not only alleviates the problem of heat from the adapter 14 causing the insulating properties of the insulating member 15 to fail, but also improves the compactness of the distribution of the adapter 14 and the insulating member 15, thereby contributing to a more compact structure for the battery cell 10 and increasing its energy density.

[0192] In some embodiments, the electrode assembly 11 is welded to the adapter 14 .

[0193] Specifically, the tab 112 of the electrode assembly 11 is welded to the adapter 14 .

[0194] Specifically, the first electrode tab 112 a is welded to the first adapter 14 a , and the second electrode tab 112 b is welded to the second adapter 14 b .

[0195] By welding the electrode assembly 11 and the adapter 14 , a conductive connection between the electrode assembly 11 and the adapter 14 can be achieved, thereby achieving a connection between the electrode assembly 11 and the electrode terminal 13 .

[0196] In some embodiments, please refer to FIG3 and FIG4 together with other drawings. The portion of the adapter 14 used for welding with the electrode assembly 11 is spaced apart from the insulating member 15 .

[0197] It should be noted that a portion of the adapter 14 is used to weld to the electrode assembly 11 to achieve conductive connection between the adapter 14 and the electrode assembly 11. During the welding process between the electrode assembly 11 and the adapter 14, the temperature of the portion of the adapter 14 used to weld to the electrode assembly 11 rises sharply.

[0198] By spacing the portion of the adapter 14 used for welding to the electrode assembly 11 from the insulating member 15, the speed at which the heat generated by the electrode assembly 11 and the adapter 14 during welding is transferred to the insulating member 15 can be slowed down, thereby improving the problem of insulation failure of the insulating member 15.

[0199] It should be supplemented that the first weld mark and the second weld mark mentioned below are both provided on the portion of the adapter 14 used for welding to the electrode assembly 11 .

[0200] The portion of the adapter 14 used for welding to the electrode assembly 11 can be spaced apart from the main body 151 of the insulating member 15 along the first direction Z, or can be spaced apart from the first boss 152 along the second direction X. Furthermore, the adapter 14 can be divided into two parts, one of which is used for welding to the electrode assembly 11. In the second direction X, the other part of the adapter 14 can be located between the portion of the adapter 14 used for welding to the electrode assembly 11 and the boss 153, so that the portion of the adapter 14 used for welding to the electrode assembly 11 can also be spaced apart from the boss 153.

[0201] In some embodiments, please refer to Figures 3 and 6 in conjunction with other figures. Figure 6 is a schematic diagram illustrating the mating of the end cap 122 and first adapter 14a of a battery cell 10 provided in some embodiments of the present application. This schematic diagram shows the end cap 122 and first adapter 14a viewed from the second adapter 14b along a first direction Z pointing toward the first adapter 14a. This schematic diagram illustrates the projection of the first electrode terminal 13a, first connecting portion 1121a, and second connecting portion 1122a onto the first adapter 14a using dotted lines. The adapter 14 defines a positioning hole 1401, into which the electrode terminal 13 is inserted.

[0202] In some possible designs, the positioning hole 1401 passes through one end of the adapter 14 away from the electrode assembly 11 along the first direction Z. In other possible designs, as shown in Figures 3 and 6, the positioning hole 1401 passes through opposite ends of the adapter 14 along the first direction Z. Furthermore, the electrode terminal 13 is disposed on a wall of the housing 12 along the first direction Z and is inserted into the positioning hole 1401 along the first direction Z.

[0203] In some possible designs, as shown in Figures 3 and 6, the first adapter 14a is provided with the aforementioned positioning hole 1401, and the first electrode terminal 13a is inserted into the positioning hole 1401 of the first adapter 14a. In some possible designs, the second adapter 14b may also be provided with the aforementioned positioning hole 1401, and the second electrode terminal 13b is inserted into the positioning hole 1401 of the second adapter 14b. In some possible designs, both the first adapter 14a and the second adapter 14b are provided with the aforementioned positioning holes 1401, and the first electrode terminal 13a is inserted into the positioning hole 1401 on the first adapter 14a, and the second electrode terminal 13b is inserted into the positioning hole 1401 on the second adapter 14b.

[0204] By inserting the electrode terminal 13 into the positioning hole 1401 , the electrode terminal 13 is easily positioned on the battery cell 10 , and the conductive connection between the electrode terminal 13 and the adapter 14 is also easily achieved.

[0205] In some possible designs, the electrode terminal 13 and the adapter 14 can be connected by penetration welding, so that the positioning hole 1401 can be sealed. The welding process is simple and only requires welding in sequence. It is easy to implement and has low cost.

[0206] In some embodiments, please refer to FIG3 and FIG6 together with other drawings. The electrode assembly 11 is welded to the adapter 14 , and the weld marks formed by the welding of the electrode assembly 11 and the adapter 14 are spaced apart from the positioning holes 1401 .

[0207] It is understood that after the tab 112 of the electrode assembly 11 is welded to the adapter 14 to establish electrical continuity, a weld mark is formed between the tab 112 and the adapter 14. The weld mark refers to the structure formed by the solidified solder used in the welding process between the tab 112 and the adapter 14. In addition, the weld mark is spaced apart from the positioning hole 1401.

[0208] The weld marks formed by welding the electrode assembly 11 and the adapter 14 may be spaced apart from the positioning hole 1401 along a direction intersecting the first direction Z. As an example, the weld marks formed by welding the electrode assembly 11 and the adapter 14 are spaced apart from the positioning hole 1401 along the second direction X.

[0209] Figure 6 illustrates a plane coordinate system, in which the X-axis and the Y-axis are two perpendicular coordinate axes, i.e., the X-axis is perpendicular to the Y-axis. Furthermore, the plane coordinate system of Figure 6 is the plane coordinate system formed by the X-axis and the Y-axis of the spatial coordinate system of Figure 5 .

[0210] As an example, as shown in FIG6 , the weld mark formed after welding the first tab 112a to the first adapter 14a is spaced apart from the positioning hole 1401 on the first adapter 14a. Furthermore, the weld mark formed after welding the first tab 112a to the first adapter 14a may include the first connecting portion 1121a described below, or may include both the first connecting portion 1121a and the second connecting portion 1122a described below. Of course, when the second adapter 14b also has a positioning hole 1401, the weld mark formed after welding the second tab 112b to the second adapter 14b may also be spaced apart from the positioning hole 1401 on the second adapter 14b. Furthermore, the weld mark formed after welding the second tab 112b to the second adapter 14b may include the third connecting portion 1121b described below, or may include both the third connecting portion 1121b and the fourth connecting portion 1122b described below.

[0211] Such a setting can improve the problem of solder used in the welding process of the tab 112 and the adapter 14 flowing into the positioning hole 1401, and further improve the problem that the welding process of the tab 112 and the adapter 14 will interfere with the positioning function of the positioning hole 1401 on the electrode terminal 13, thereby facilitating the assembly of the battery cell 10.

[0212] In some embodiments, please refer to Figures 3, 6, and 7 together, and in conjunction with other drawings. Figure 7 is a schematic diagram of the second adapter 14b of the battery cell 10 provided in some embodiments of the present application. The schematic diagram is a view of the second adapter 14b in the direction from the first adapter 14a to the second adapter 14b along the first direction Z. The schematic diagram shows the projection of the second electrode terminal 13b, the third connecting portion 1121b, and the fourth connecting portion 1122b on the second adapter 14b through dotted lines. The electrode assembly 11 includes a main body 111 and a tab 112 provided on the main body 111. The tab 112 includes a plurality of sub-tabs 112, and the plurality of sub-tabs 112 are welded to form a first weld mark. At least a portion of the first weld mark is welded to the adapter 14 to form a second weld mark, and the second weld mark is spaced apart from the positioning hole 1401.

[0213] The sub-tab 112 is a partial structure of the tab 112 , and a plurality of sub-tabs 112 can constitute the tab 112 . The sub-tab 112 is connected to the main body 111 .

[0214] It should be noted that when welding the tab 112 to the adapter 14, the multiple sub-tabs 112 of the tab 112 can be pre-welded first. After the pre-welding of the multiple sub-tabs 112 of the tab 112, a first weld mark is formed on the tab 112. Then, at least a portion of the first weld mark is welded to the adapter 14. After the welding of at least a portion of the first weld mark to the adapter 14, a second weld mark is formed between the first weld mark and the adapter 14.

[0215] It can be understood that the weld mark formed by welding the electrode assembly 11 and the adapter 14 may include a second weld mark, and the second weld mark is spaced apart from the positioning hole 1401.

[0216] The tab 112 can be a first tab 112a or a second tab 112b. Both the first tab 112a and the second tab 112b can include sub-tabs 112. The sub-tab 112 of the first tab 112a is the first sub-tab 112, and the sub-tab 112 of the second tab 112b is the second sub-tab 112. That is, a plurality of first sub-tabs 112 constitute the first tab 112a, and a plurality of second sub-tabs 112 constitute the second tab 112b.

[0217] It can be understood that the sub-electrode tab 112 involved in each embodiment of the present application can be the first sub-electrode tab 112 or the second sub-electrode tab 112 .

[0218] As shown in Figure 6, the plurality of first sub-tabs 112 are welded to form a first weld mark on the first tab 112a. At least a portion of the first weld mark on the first tab 112a is welded to the first adapter 14a to form a second weld mark between the first weld mark on the first tab 112a and the first adapter 14a.

[0219] As shown in Figure 7, the plurality of second sub-tabs 112 are welded to form a first weld mark on the second tab 112b. At least a portion of the first weld mark on the second tab 112b is welded to the second transition piece 14b to form a second weld mark between the first weld mark on the second tab 112b and the second transition piece 14b.

[0220] As an example, as shown in Figure 6, the first weld mark of the first tab 112a and the second weld mark between the first adapter 14a are spaced apart from the positioning hole 1401 on the first adapter 14a. Of course, when the second adapter 14b also has a positioning hole 1401, the first weld mark of the second tab 112b and the second weld mark between the second adapter 14b can also be spaced apart from the positioning hole 1401 on the second adapter 14b.

[0221] It should be supplemented here that the plane coordinate system of FIG. 7 is a plane coordinate system composed of the X-axis and the Y-axis of the spatial coordinate system of FIG. 5 .

[0222] By adopting the above technical solution, the weld mark formed by welding the electrode assembly 11 to the adapter 14 can include a second weld mark, which is spaced apart from the positioning hole 1401. This can alleviate the problem of solder used in the welding process between the tab 112 and the adapter 14 flowing into the positioning hole 1401. In addition, it can also alleviate the problem that the welding process between the tab 112 and the adapter 14 interferes with the positioning function of the positioning hole 1401 for the electrode terminal 13, thereby facilitating the assembly of the battery cell 10. In addition, the first weld mark formed by welding multiple sub-tabs 112 of the tab 112 facilitates the welding operation between the tab 112 and the adapter 14.

[0223] In some embodiments, the plurality of sub-tabs 112 are welded and welded to the adapter 14 to form a first weld mark, and the first weld mark is spaced apart from the positioning hole 1401 .

[0224] It can be understood that during the welding process of the plurality of sub-tabs 112 , they are also pre-welded with the adapter 14 to form the above-mentioned first weld mark.

[0225] It can also be understood that the weld mark formed by welding the electrode assembly 11 and the adapter 14 can also include a first weld mark, and the first weld mark is spaced apart from the positioning hole 1401.

[0226] This arrangement allows the multiple tabs 112 to be welded together with the adapter 14 during the welding process. This increases the number of welds between the tabs 112 and the adapter 14, thereby improving the conductive strength between the adapter 14 and the tabs 112. Furthermore, the first weld marks are spaced apart from the positioning holes 1401, making it difficult for solder to flow into the positioning holes 1401 during the welding process between the tabs 112 and the adapter 14. This alleviates the problem of the welding process between the tabs 112 and the adapter 14 interfering with the positioning function of the positioning holes 1401 for the electrode terminals 13, thereby facilitating assembly of the battery cell 10.

[0227] In some embodiments, please refer to FIG3 and FIG6 together with other drawings. The minimum distance between the weld mark formed by welding the electrode assembly 11 and the adapter 14 and the positioning hole 1401 is 0.2 to 6 mm.

[0228] The weld mark formed by welding the electrode assembly 11 and the adapter 14 may include a first weld mark and a second weld mark, or may include the second weld mark but not the first weld mark.

[0229] Taking the first adapter 14a as an example, as shown in FIG6 , during the welding process of the plurality of first sub-electrode tabs 112, a first weld mark is also formed by welding with the first adapter 14a, and at least a portion of the first weld mark is welded with the first adapter 14a to form a second weld mark. In this case, the weld mark formed by welding the electrode assembly 11 and the adapter 14 may include a first weld mark and a second weld mark. The first weld mark is spaced apart from the first adapter 14a, and the second weld mark is spaced apart from the positioning hole 1401. Based on this, the orthographic projection of the first weld mark on the first adapter 14a is larger than the second weld mark and covers the second weld mark. The minimum spacing between the weld mark formed by welding the electrode assembly 11 and the adapter 14 and the positioning hole 1401 is the straight-line distance between the first weld mark and the positioning hole 1401, which is the first spacing H4.

[0230] During the welding process of the plurality of first sub-tabs 112 to form the first weld mark, they are not welded to the first adapter 14a. Instead, after welding, at least a portion of the first weld mark is welded to the first adapter 14a to form a second weld mark. In this case, the weld mark formed by the welding of the electrode assembly 11 and the adapter 14 may include the second weld mark, but not the first weld mark. The second weld mark is spaced apart from the positioning hole 1401. Based on this, the minimum spacing between the weld mark formed by the welding of the electrode assembly 11 and the adapter 14 and the positioning hole 1401 is the straight-line distance between the second weld mark and the positioning hole 1401, which is the second spacing H5.

[0231] It can be understood that the minimum distance between the weld mark formed by welding the electrode assembly 11 and the adapter 14 and the positioning hole 1401 can be 0.5mm, 0.8mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, etc.

[0232] This arrangement ensures that the minimum distance between the weld mark formed by welding the electrode assembly 11 and the adapter 14 and the positioning hole 1401 falls within an appropriate range. This, on the one hand, can alleviate the problem of solder flowing into the positioning hole 1401 during the welding process of the electrode assembly 11 and the adapter 14, thereby alleviating the problem of the welding process of the electrode assembly 11 and the adapter 14 interfering with the positioning operation of the positioning hole 1401 with the electrode terminal 13. On the other hand, the weld mark formed by welding the electrode assembly 11 and the adapter 14, the positioning hole 1401, etc. can be compactly distributed on the adapter 14, thereby reducing the size of the adapter 14.

[0233] In some embodiments, please refer to Figures 3 and 6 together, and in conjunction with other figures. The electrode assembly 11 includes a main body 111 and a tab 112 provided on the main body 111, the tab 112 includes a first tab 112a, the electrode terminal 13 includes a first electrode terminal 13a, the adapter 14 includes a first adapter 14a, and the insulating member 15 includes a first insulating member 15a. The first adapter 14a is conductively connected to the first tab 112a and the first electrode terminal 13a, at least a portion of the first insulating member 15a is located between the first adapter 14a and the housing 12, and at least a portion of the first insulating member 15a is spaced apart from the first adapter 14a. The first adapter 14a is conductively connected to the first tab 112a to form a plurality of spaced apart first connecting portions 1121a.

[0234] The first connecting portion 1121 a refers to a structure formed by conductive connection between the first adapter 14 a and the first tab 112 a . The first connecting portion 1121 a is disposed between the first adapter 14 a and the first tab 112 a .

[0235] It should be noted that when the first adapter 14a and the first tab 112a are conductively connected by welding, the first connection portion 1121a formed by the conductive connection between the first adapter 14a and the first tab 112a refers to the second weld mark mentioned above.

[0236] By electrically connecting the first tab 112a to the first adapter 14a, a plurality of spaced-apart first connection portions 1121a are formed, allowing the first tab 112a to be connected to a plurality of different positions on 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 improving the problem of heat concentration caused by current concentration in the first adapter 14a, and further improving the problem of excessive heat in the first adapter 14a causing the insulation performance of the first insulating member 15a to fail. On the other hand, it allows for a greater overcurrent capacity between the first adapter 14a and the first tab 112a.

[0237] In some embodiments, please refer to FIG3 and FIG6 together with other figures. The housing 12 is provided with a liquid injection hole 1201 , and a plurality of first connection portions 1121 a are provided on a side of the first electrode terminal 13 a away from the liquid injection hole 1201 .

[0238] The injection hole 1201 is a hole for allowing electrolyte to enter the internal environment of the battery cell 10 .

[0239] The first connection portion 1121a is located on a side of the first electrode terminal 13a away from the liquid injection hole 1201. As an example, as shown in FIG6 , the first connection portion 1121a is located on a side of the first electrode terminal 13a away from the liquid injection hole 1201 along the second direction X. That is, in the second direction X, the first electrode terminal 13a is located between the liquid injection hole 1201 and the first connection portion 1121a, and the line (straight line) connecting the liquid injection hole 1201 and the first connection portion 1121a can pass through the first electrode terminal 13a. Furthermore, multiple first connection portions 1121a are located on the same side of the first electrode terminal 13a away from the liquid injection hole 1201 along the second direction X, meaning that the line (straight line) connecting any two adjacent first connection portions 1121a does not pass through the first electrode terminal 13a.

[0240] Because the first connection portion 1121a is located on the side of the first electrode terminal 13a away from the liquid injection hole 1201, the first adapter 14a can be arranged as far away from the liquid injection hole 1201 as possible, so that the first adapter 14a will not interfere with the operation of the liquid injection hole 1201.

[0241] It should be noted that the injection hole 1201 and the first adapter 14 a are spaced apart so that the first adapter 14 a is disposed away from the injection hole 1201 . In this way, the first adapter 14 a does not interfere with the operation of injecting electrolyte into the housing 12 .

[0242] In some embodiments, if the area of ​​the first adapter 14a is large enough, multiple first connecting portions 1121a can be distributed on opposite sides of the first electrode terminal 13a. Specifically, at least a portion of the first connecting portion 1121a of the first electrode terminal 13a is disposed between two first connecting portions 1121a, that is, a line (straight line) connecting the two first connecting portions 1121a 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 insulation failure of the first insulating member 15a.

[0243] In some embodiments, please refer to FIG3 to FIG6 in conjunction with other drawings. The housing 12 has a first wall 122a on one side along the first direction Z. The first electrode terminal 13a and the liquid injection hole 1201 are spaced apart from each other on the first wall 122a.

[0244] It can be understood that the liquid injection hole 1201 and the first electrode terminal 13 a are provided on the same wall of the housing 12 along the first direction Z.

[0245] 3 to 6 , the injection hole 1201 and the first adapter 14 a are spaced apart along the first direction Z. Furthermore, the injection hole 1201 and the first adapter 14 a are spaced apart along the second direction X.

[0246] The first electrode terminal 13 a and the liquid injection hole 1201 are arranged on the same wall of the housing 12 along the first direction Z, which helps to improve the structural compactness of the battery cell 10 .

[0247] In some embodiments, referring to Figures 3 and 6 in conjunction with other figures, the first tab 112a includes a plurality of first sub-tabs 112, which are connected to form a second connecting portion 1122a. At least a portion of the second connecting portion 1122a is conductively connected to the first adapter 14a to form a first connecting portion 1121a.

[0248] The second connecting portion 1122 a refers to a structure formed by connecting a plurality of first sub-tabs 112 , and the second connecting portion 1122 a is provided on the first tab 112 a .

[0249] It should be noted that when the plurality of first sub-tabs 112 are connected by welding, the plurality of first sub-tabs 112 are connected to form the second connection portion 1122 a , which refers to the first weld mark mentioned above.

[0250] Based on the above structure, when conductively connecting the first tab 112a and the first adapter 14a, the plurality of first sub-tabs 112 can be first connected to form the second connecting portion 1122a, and then at least a portion of the second connecting portion 1122a can be conductively connected to the first adapter 14a to form a conductive connection between the first tab 112a and the first adapter 14a. This arrangement can ensure that the first tab 112a is conductively connected to the first adapter 14a.

[0251] In some embodiments, please refer to Figures 3 and 7 together, and in conjunction with other figures. The tab 112 further includes a second tab 112b, the electrode terminal 13 further includes a second electrode terminal 13b, the adapter 14 further includes a second adapter 14b, and the insulating member 15 further includes a second insulating member 15b. The second adapter 14b is conductively connected to the second tab 112b and the second electrode terminal 13b. At least a portion of the second insulating member 15b is located between the second adapter 14b and the housing 12, and at least a portion of the second insulating member 15b is spaced apart from the second adapter 14b.

[0252] It can be understood that the number of electrode terminals 13, adapters 14, and insulating members 15 is two. The two electrode terminals 13 are respectively a first electrode terminal 13a and a second electrode terminal 13b. The two adapters 14 are respectively a first adapter 14a and a second adapter 14b. The two insulating members 15 are respectively a first insulating member 15a and a second insulating member 15b. The first adapter 14a is electrically connected to the first electrode tab 112a, and the first adapter 14a is electrically connected to the first electrode terminal 13a. The second adapter 14b is electrically connected to the second electrode tab 112b, and the second adapter 14b is electrically connected to the second electrode terminal 13b. At least a portion of the first insulating member 15a is located between the first adapter 14a and the inner wall of the outer shell 12 to provide insulation between the first adapter 14a and the outer shell 12. At least a portion of the second insulating member 15b is located between the second adapter 14b and the outer shell 12 to provide insulation between the outer shell 12 and the second adapter 14b.

[0253] With such an arrangement, an insulating member 15 can be provided between each adapter 14 and the housing 12 , thereby achieving insulation between each adapter 14 and the housing 12 .

[0254] In some embodiments, please refer to Figures 3 and 7 together, in conjunction with other figures. Tab 112 further includes a second tab 112b, electrode terminal 13 further includes a second electrode terminal 13b, and adapter 14 further includes a second adapter 14b. Second adapter 14b is conductively connected to second tab 112b and second electrode terminal 13b. Second tab 112b and second adapter 14b are conductively connected to form a plurality of spaced-apart third connecting portions 1121b.

[0255] The third connection portion 1121 b refers to a structure formed by conductive connection between the second adapter 14 b and the second tab 112 b . The third connection portion 1121 b is disposed between the second adapter 14 b and the second tab 112 b .

[0256] It should be noted that when the second adapter 14b and the second tab 112b are conductively connected by welding, the third connection portion 1121b formed by the conductive connection between the second adapter 14b and the second tab 112b refers to the second weld mark mentioned above.

[0257] By conductively connecting the second tab 112b to the second adapter 14b to form a plurality of spaced-apart third connection portions 1121b, the second tab 112b is connected to a plurality of 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 the insulation performance of the second insulating member 15b to fail. On the other hand, it allows for a greater overcurrent capacity between the second adapter 14b and the second tab 112b.

[0258] In some embodiments, referring to FIG7 and other figures, at least a portion of the second electrode terminal 13b is located between the two third connection portions 1121b.

[0259] It can be understood that the connecting line (straight line) of the two third connection portions 1121 b may pass through the second electrode terminal 13 b .

[0260] As an example, as shown in FIG7 , two third connection portions 1121b are spaced apart along the second direction X. Furthermore, a portion of the second electrode terminal 13b is located between the two third connection portions 1121b. In this way, one third connection portion 1121b, a portion of the second electrode terminal 13b, and the other third connection portion 1121b are sequentially distributed along the second direction X, thereby positioning the two third connection portions 1121b on opposite sides of the second electrode terminal 13b along the second direction X. Of course, in other examples, the two third connection portions 1121b may also be spaced apart along directions intersecting the first direction Z and the second direction X, respectively, with at least a portion of the second electrode terminal 13b located between the two third connection portions 1121b.

[0261] Such a configuration makes the multiple positions of the second adapter 14b for connecting to the second pole ear 112b 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 insulation performance of the second insulating member 15b to fail.

[0262] In some embodiments, referring to FIG. 7 and other figures, the second electrode tab 112 b includes a plurality of second sub-electrode tabs 112 , which are connected to form a fourth connecting portion 1122 b . At least a portion of the fourth connecting portion 1122 b is conductively connected to the second adapter 14 b to form a third connecting portion 1121 b .

[0263] The fourth connecting portion 1122 b refers to a structure formed by connecting a plurality of second sub-electrode tabs 112 , and the fourth connecting portion 1122 b is disposed on the second electrode tab 112 b .

[0264] It should be noted that, when the plurality of second sub-tabs 112 are connected by welding, the fourth connection portion 1122 b formed by the plurality of second sub-tabs 112 is referred to as the first weld mark mentioned above.

[0265] Based on the above structure, when conductively connecting the second tab 112b to the second adapter 14b, the plurality of second sub-tabs 112 can be first connected to form a fourth connecting portion 1122b, and then at least a portion of the fourth connecting portion 1122b can be conductively connected to the second adapter 14b to form a conductive connection between the second tab 112b and the second adapter 14b. This arrangement can ensure a better conductive connection between the second tab 112b and the second adapter 14b.

[0266] In some embodiments, referring to FIG. 7 and other figures, a plurality of second sub-tabs 112 are connected to form a plurality of spaced-apart fourth connecting portions 1122 b. At least a portion of each fourth connecting portion 1122 b is conductively connected to the second adapter 14 b to form a corresponding third connecting portion 1121 b.

[0267] A plurality of spaced-apart fourth connection portions 1122b are formed by connecting through the second sub-pole ear 112, so that each fourth connection portion 1122b is conductively connected to the second adapter 14b to form a corresponding third connection portion 1121b, so that the current between the second adapter 14b and the second pole ear 112b can be distributed more evenly, thereby reducing the overcurrent temperature of the second adapter 14b, thereby reducing the risk of the second adapter 14b causing the insulation performance of the second insulating member 15b to fail.

[0268] 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.

[0269] The battery 100 provided in the embodiment of the present application adopts the battery cell 10 involved above, and by distributing at least a portion of the insulating part 15 at intervals from the adapter 14, the heat conduction between the adapter 14 and the insulating part 15 can be slowed down, thereby improving the problem of heat from the adapter 14 being conducted to the insulating part 15, causing the insulating performance of the insulating part 15 to fail. In this way, the insulating part 15 can achieve a good insulation effect between the adapter 14 and the shell 12, so that the battery 100 has higher reliability.

[0270] 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.

[0271] The electrical device provided in the embodiment of the present application adopts the battery cell 10 or battery 100 mentioned above. By distributing at least a portion of the insulating part 15 at intervals from the adapter 14, the heat conduction between the adapter 14 and the insulating part 15 can be slowed down, thereby improving the problem of heat on the adapter 14 being conducted to the insulating part 15, causing the insulating performance of the insulating part 15 to fail. In this way, the insulating part 15 can achieve a good insulation effect between the adapter 14 and the shell 12, so that the battery 100 or the battery cell 10 has higher reliability.

[0272] As one embodiment of the present application, as shown in Figures 3 to 7, a battery cell 10 includes a housing 12, an electrode assembly 11, a first electrode terminal 13a, a second electrode terminal 13b, a first adapter 14a, a second adapter 14b, a first insulating member 15a, and a second insulating member 15b. The electrode assembly 11, the first adapter 14a, the second adapter 14b, the first insulating member 15a, and the second insulating member 15b are all disposed within the housing 12. 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 opposite ends of the main body 111 along a first direction Z. The housing 12 has two opposing walls along the first direction Z, namely a first wall 122a and a second wall 122b. The first electrode terminal 13a is disposed on the first wall 122a, and the second electrode terminal 13b is disposed on the second wall 122b. Along the first direction Z, the first adapter 14a is disposed on the first electrode tab 112a, and at least a portion of the first insulating member 15a is located between the first adapter 14a and the first wall 122a. Along the first direction Z, the second adapter 14b is disposed on the second electrode tab 112b, and at least a portion of the second insulating member 15b is located between the second adapter 14b and the second wall 122b. The first adapter 14a is welded to the first electrode tab 112a, and the first adapter 14a is welded to the first electrode terminal 13a. The second adapter 14b is welded to the second electrode tab 112b, and the second adapter 14b is welded to the second electrode terminal 13b. Furthermore, at least a portion of the first insulating member 15a is spaced apart from the first adapter 14a, and at least a portion of the second insulating member 15b is spaced apart from the second adapter 14b.

[0273] The first adapter 14a defines a positioning hole 1401 , and the first electrode terminal 13a is inserted into the positioning hole 1401 along the first direction Z. The weld mark formed by welding the first electrode tab 112a to the first adapter 14a and the positioning hole 1401 are spaced apart.

[0274] A liquid injection hole 1201 is defined in the first wall 122 a , and a weld mark formed by welding the first adapter 14 a and the first tab 112 a is located on a side of the first electrode terminal 13 a away from the liquid injection hole 1201 .

[0275] The weld marks formed by welding the second adapter 14b and the second tab 112b are located on opposite sides of the second electrode terminal 13b. Specifically, at least a portion of the second electrode terminal 13b is located between two weld marks formed by welding the second adapter 14b and the second tab 112b.

[0276] 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: Housing (12); An electrode assembly (11) is disposed in the housing (12); Electrode terminal (13); A switching element (14) is disposed in the housing (12) and is conductively connected to the electrode assembly (11) and the electrode terminal (13); An insulating member (15) is disposed in the housing (12) and at least partially located between the adapter (14) and the housing (12); at least a portion of the insulating member (15) is spaced apart from the adapter (14).

2. The battery cell (10) according to claim 1, wherein: The adapter (14) is arranged at the end of the electrode assembly (11) along a first direction (Z); the insulating member (15) comprises a main body (151), and along the first direction (Z), the main body (151) is located between the adapter (14) and the housing (12), and is spaced apart from the adapter (14) along the first direction (Z).

3. The battery cell (10) according to claim 2, wherein: The insulating member (15) further comprises a first boss (152), wherein the first boss (152) is arranged on one side of the main body (151) along the first direction (Z) toward the electrode assembly (11); the adapter (14) and the first boss (152) are spaced apart from each other along a second direction (X), and the second direction (X) intersects with the first direction (Z).

4. The battery cell (10) according to claim 2 or 3, wherein: The outer shell (12) is provided with a liquid injection hole (1201) on the wall along the first direction (Z), and the insulating member (15) further comprises a convex column (153), and the convex column (153) is arranged on a side of the main body (151) facing the electrode assembly (11) along the first direction (Z); the convex column (153) is connected to the liquid injection hole (1201) and is connected to the inside of the outer shell (12); the adapter (14) and the convex column (153) are spaced apart along the second direction (X), and the second direction (X) intersects with the first direction (Z).

5. The battery cell (10) according to any one of claims 1 to 4, wherein: A gap formed between at least a portion of the insulating member (15) and the adapter member (14) is greater than 0.1 mm.

6. The battery cell (10) according to claim 5, wherein: A gap formed between at least a portion of the insulating member (15) and the adapter member (14) is less than 2 mm.

7. The battery cell (10) according to any one of claims 1 to 6, wherein: The electrode assembly (11) is welded to the adapter (14).

8. The battery cell (10) according to claim 7, wherein: The weld mark formed by welding the electrode assembly (11) and the adapter (14) is spaced apart from the insulating member (15).

9. The battery cell (10) according to any one of claims 1 to 8, wherein: The adapter (14) is provided with a positioning hole (1401), and the electrode terminal (13) is inserted into the positioning hole (1401).

10. The battery cell (10) according to claim 9, wherein: The electrode assembly (11) and the adapter (14) are welded, and a weld mark formed by welding the electrode assembly (11) and the adapter (14) is spaced apart from the positioning hole (1401).

11. The battery cell (10) according to claim 10, wherein: The electrode assembly (11) comprises a main body (111) and a pole ear (112) arranged on the main body (111); the pole ear (112) comprises a plurality of sub-pole ears, the plurality of sub-pole ears are welded to form a first weld mark, at least a portion of the first weld mark is welded to the adapter (14) to form a second weld mark, and the second weld mark is spaced apart from the positioning hole (1401).

12. The battery cell (10) according to claim 11, wherein: A plurality of the sub-electrode tabs are welded and welded with the adapter (14) to form the first weld mark, and the first weld mark is spaced apart from the positioning hole (1401).

13. The battery cell (10) according to any one of claims 10 to 12, wherein: The minimum distance between the weld mark formed by welding the electrode assembly (11) and the adapter (14) and the positioning hole (1401) is 0.2 to 6 mm.

14. The battery cell (10) according to any one of claims 1 to 13, wherein: The electrode assembly (11) comprises a main body (111) and a pole lug (112) provided on the main body (111); the pole lug (112) comprises a first pole lug (112a), the electrode terminal (13) comprises a first electrode terminal (13a), the adapter (14) comprises a first adapter (14a), and the insulating member (15) comprises a first insulating member (15a); the first adapter (14a) is conductively connected to the first pole lug (112a) and the first electrode terminal (13a), at least a portion of the first insulating member (15a) is located between the first adapter (14a) and the housing (12), and at least a portion of the first insulating member (15a) is spaced apart from the first adapter (14a); The first adapter (14a) is conductively connected to the first pole lug (112a) to form a plurality of first connecting portions (1121a) distributed at intervals.

15. The battery cell (10) according to claim 14, wherein: The housing (12) is provided with a liquid injection hole (1201), and the plurality of first connection portions (1121a) are arranged on a side of the first electrode terminal (13a) away from the liquid injection hole (1201).

16. The battery cell (10) according to claim 15, wherein: The housing (12) is provided with a first wall (122a) on one side along the first direction (Z), and the first electrode terminal (13a) and the liquid injection hole (1201) are spaced apart from each other on the first wall (122a).

17. The battery cell (10) according to any one of claims 14 to 16, wherein: The first pole lug (112a) comprises a plurality of first sub-pole lugs, the plurality of first sub-pole lugs are connected to form a second connecting portion (1122a), and at least a portion of the second connecting portion (1122a) is conductively connected to the first adapter (14a) to form the first connecting portion (1121a).

18. The battery cell (10) according to any one of claims 14 to 17, wherein: The pole lug (112) further includes a second pole lug (112b), the electrode terminal (13) further includes a second electrode terminal (13b), the adapter (14) further includes a second adapter (14b), and the insulating member (15) further includes a second insulating member (15b); the second adapter (14b) is conductively connected to the second pole lug (112b) and the second electrode terminal (13b), at least a portion of the second insulating member (15b) is located between the second adapter (14b) and the housing (12), and at least a portion of the second insulating member (15b) is spaced apart from the second adapter (14b).

19. The battery cell (10) according to any one of claims 14 to 18, wherein: The pole lug (112) further includes a second pole lug (112b), the electrode terminal (13) further includes a second electrode terminal (13b), and the adapter (14) further includes a second adapter (14b), the second adapter (14b) being conductively connected to the second pole lug (112b) and the second electrode terminal (13b); the second pole lug (112b) is conductively connected to the second adapter (14b) to form a plurality of third connection portions (1121b) distributed at intervals.

20. The battery cell (10) according to claim 19, wherein: At least a portion of the second electrode terminal (13b) is located between the two third connecting portions (1121b).

21. The battery cell (10) according to claim 19 or 20, wherein: The second pole lug (112b) comprises a plurality of second sub-pole lugs, and the plurality of second sub-pole lugs are connected to form a fourth connecting portion (1122b), and at least a portion of the fourth connecting portion (1122b) is conductively connected to the second adapter (14b) to form the third connecting portion (1121b).

22. The battery cell (10) according to claim 21, wherein: A plurality of the second sub-electrode tabs are connected to form a plurality of fourth connection portions (1122b) distributed at intervals, and at least a portion of each fourth connection portion (1122b) is conductively connected to the second adapter (14b) to form a corresponding third connection portion (1121b).

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 a battery cell (10) according to any one of Claims 1 to 22; or comprising a battery (100) according to Claim 22.

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