Battery monomer, 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 a power utilization device, the power utilization device comprising the battery (100), the battery (100) comprising the battery cell (10), the battery cell (10) comprising a housing (12), an electrode assembly (11), an electrode terminal (13), an adapter (14) and an insulator (15). And the electrode assembly (11) is arranged in the shell (12). The adapter (14) is disposed in the housing (12) and is conductively connected to the electrode assembly (11) and the electrode terminal (13). The insulating part (15) is arranged in the shell (12), at least part of the insulating part (15) is located between the adapter (14) and the shell (12), and at least part of the insulating part (15) and the adapter (14) are distributed at intervals. At least part of the insulating part (15) and the adapter part (14) are distributed at intervals, so that the problem that the insulating property of the insulating part (15) fails due to the fact that heat of the adapter part (14) is conducted to the insulating part (15) can be solved.

Description

[0001] Cross-references

[0002] This application claims priority to the Chinese patent application with application number 202311017397.0 and application name “Battery Cell, Battery and Electrical Device” filed with the State Intellectual Property Office of the People’s Republic of China on August 11, 2023, the entire contents of which are incorporated by reference in 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 the related art, a battery cell includes a housing, an electrode assembly, an electrode terminal, a switching member, and an insulating member. The electrode assembly, the switching member, and the insulating member are all arranged in the housing, and the electrode terminal is arranged in the housing. The switching member is welded to the electrode lug and the electrode terminal of the electrode assembly respectively to achieve conduction between the electrode assembly and the electrode terminal. The insulating member is used to achieve insulation between the switching member and the housing, and between the electrode assembly and the housing.

[0005] In some cases, heat will be generated when overcurrent occurs in the adapter, 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, causing the insulating performance of the insulating part to fail. Utility Model Content

[0006] 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, which can improve the technical problem that the insulating parts may be melted and cause the insulation performance to fail.

[0007] The technical solution adopted in the embodiment of the present application is:

[0008] In a first aspect, an embodiment of the present application provides a battery cell, including:

[0009] shell;

[0010] An electrode assembly is disposed in the housing;

[0011] An electrode terminal is disposed on the housing;

[0012] The adapter is disposed in the housing and is conductively connected to the electrode assembly and the electrode terminal;

[0013] The insulating component is arranged in the shell and at least partly located between the shell and the adapter. At least part of the insulating component is spaced apart from the adapter.

[0014] 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 with the adapter, thereby improving the problem of heat from the adapter being conducted to the insulating part causing the insulation performance of the insulating part to fail, so that the insulating part can achieve a good insulation effect between the adapter and the outer shell.

[0015] 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.

[0016] Such an arrangement 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.

[0017] 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.

[0018] By adopting the above-mentioned technical solution, the adapter is not only spaced apart from the main body of the insulating member, but also spaced apart from the first boss of the insulating member. This can better slow down the conduction of heat between the adapter and the insulating member, so as to improve the problem of the heat of the adapter causing the insulation performance of the insulating member to fail, specifically including the insulation performance failure of the main body of the insulating member and the insulation performance failure of the first boss.

[0019] 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.

[0020] 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 heat of the adapter causing the insulation performance of the insulating part to fail.

[0021] 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.

[0022] Such an arrangement allows a larger gap to be provided 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 further facilitating improvement of the problem of insulation performance failure of the insulating member due to heat from the adapter.

[0023] In some embodiments, a gap formed between at least a portion of the insulating member and the transition member is smaller than 2 mm.

[0024] In this way, on the basis of being able to improve the problem of the 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, which helps to achieve the structural compactness of the battery cell and improve the energy density of the battery cell.

[0025] In some embodiments, the electrode assembly is welded to the adapter.

[0026] By welding the electrode assembly and the adapter, a conductive connection between the electrode assembly and the adapter can be achieved, so as to realize the transfer between the electrode assembly and the electrode terminal.

[0027] In some embodiments, the adapter is used to be spaced apart from the insulating member at the position of the electrode assembly.

[0028] By spacing the portion of the adapter used for welding to the electrode assembly from the insulating member, the speed at which the heat generated by the electrode assembly and the adapter during welding is conducted to the insulating member can be slowed down, thereby improving the problem of insulation failure of the insulating member.

[0029] In some embodiments, the adapter is provided with a positioning hole, and the electrode terminal is inserted into the positioning hole.

[0030] By inserting the electrode terminal into the positioning hole, it is convenient to position the electrode terminal on the battery cell and to realize the conductive connection between the electrode terminal and the adapter.

[0031] In some embodiments, the electrode assembly is welded to the adapter, and the weld marks formed by welding the electrode assembly to the adapter are spaced apart from the positioning holes.

[0032] Such a configuration 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.

[0033] 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.

[0034] This 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. In addition, the first weld mark is formed by welding multiple sub-tabs of the tab, which facilitates the welding operation of the tab and the adapter.

[0035] In some embodiments, a plurality of sub-tabs are welded and welded with the adapter to form a first weld mark, and the first weld mark is spaced apart from the positioning hole.

[0036] With such arrangement, during the welding process of multiple sub-tabs, the tabs are also welded to the adapter, which increases the number of welding times between the tabs and the adapter, and can improve the conduction strength between the adapter and the tabs. In addition, the first weld marks are also spaced apart from the positioning holes, so that during the welding process of the sub-tabs and the adapter, the solder is not easy to flow into the positioning holes, thereby improving the problem that the welding process of the tabs and the adapter will interfere with the positioning function of the positioning holes on the electrode terminals, thereby facilitating the assembly of the battery cells.

[0037] 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.

[0038] Such a configuration allows the minimum spacing between the weld marks formed by welding the electrode assembly and the adapter and the positioning hole to have a suitable range, which can improve the problem of solder flowing into the positioning hole during the welding process of the electrode assembly and the adapter, thereby improving 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 marks, positioning holes, etc. formed by welding the electrode assembly and the adapter can be compactly distributed on the adapter, thereby reducing the size of the adapter.

[0039] In some embodiments, the electrode assembly includes a main body and a tab disposed 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;

[0040] The first adapter is conductively connected to the first electrode tab to form a plurality of first connection portions distributed at intervals.

[0041] In this way, on the one hand, the current distribution between the first adapter and the first pole lug can be more uniform, so that the overcurrent temperature of the first adapter can be reduced to improve the problem of heat concentration caused by current concentration in the first adapter, and further improve the problem of insulation performance failure of the insulating member caused by excessive heat of the first adapter. On the other hand, a larger overcurrent capacity can be provided between the first adapter and the first pole lug.

[0042] 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.

[0043] Since the first connecting portion is located at a side of the first electrode terminal away from the injection hole, the first adapter can be arranged as far away from the injection hole as possible, so that the first adapter will not interfere with the operation of the injection hole.

[0044] 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 injection hole are spaced apart from each other on the first wall.

[0045] The first electrode terminal and the liquid injection hole are arranged on the same wall of the shell along the first direction, which is beneficial to improving the compactness of the structure of the battery cell.

[0046] In some embodiments, the first electrode tab includes a plurality of first sub-electrode tabs, the plurality of first sub-electrode 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.

[0047] Such an arrangement enables the first electrode tab to be better conductively connected to the first adapter.

[0048] In some embodiments, the pole lug also includes a second pole lug, the electrode terminal also includes a second electrode terminal, the adapter also includes a second adapter, and the insulating member also includes a second insulating member; the second adapter is conductively connected to the second pole lug 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.

[0049] 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.

[0050] In some embodiments, the pole lug also includes a second pole lug, the electrode terminal also includes a second electrode terminal, the adapter also includes a second adapter, and the second adapter is conductively connected to the second pole lug and the second electrode terminal; the second pole lug is conductively connected to the second adapter to form a plurality of spaced third connection portions.

[0051] Thus, on the one hand, the current distribution between the second adapter and the second tab can be more uniform, so that the overcurrent temperature of the second adapter can be reduced, so as to improve the problem of heat concentration caused by current concentration in the second adapter, and further improve the problem of insulation performance failure of the insulating member caused by excessive heat of the second adapter. On the other hand, the second adapter can have a larger overcurrent capacity between the second tab.

[0052] In some embodiments, at least a portion of the second electrode terminal is located between two third connection portions.

[0053] Such an arrangement allows the multiple positions of the second adapter for connecting to the second pole ear to be more dispersed, which can make the current inside the battery cell more uniform, thereby reducing the overcurrent temperature of the second adapter and further reducing the risk of the second adapter causing the insulation performance of the insulating member to fail.

[0054] In some embodiments, the second electrode tab includes a plurality of second sub-electrode tabs, the plurality of second sub-electrode 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.

[0055] Such an arrangement enables the second electrode tab to be better conductively connected to the second adapter.

[0056] In some embodiments, a plurality of second sub-electrode tabs are connected to form a plurality of fourth connection portions that are spaced apart from each other, and at least a portion of each fourth connection portion is conductively connected to the second adapter to form a corresponding third connection portion.

[0057] A plurality of spaced 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.

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

[0059] The battery provided in the embodiment of the present application adopts the battery cell involved above, and by distributing at least a portion of the insulating part with the adapter at intervals, the heat conduction between the adapter and the insulating part can be slowed down, and the problem of heat on the adapter being conducted to the insulating part causing the insulation performance of the insulating part to fail can be improved. In this way, the insulating part can achieve a good insulation effect between the adapter and the outer shell, so that the battery has higher reliability.

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

[0061] The electrical device provided in the embodiment of the present application adopts the battery cell or battery involved above. 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, and the problem of heat on the adapter being conducted to the insulating part causing the insulation performance of the insulating part to fail can be improved. In this way, the insulating part can achieve a good insulation effect between the adapter and the casing, so that the battery cell or battery has higher reliability.

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

[0063] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or exemplary technical descriptions will be briefly introduced below. 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 paying creative work.

[0064] Figure 1 A schematic diagram of a vehicle provided for some embodiments of the present application;

[0065] Figure 2 An exploded schematic diagram of a battery provided in some embodiments of the present application;

[0066] Figure 3 A cross-sectional view of a battery cell provided for some embodiments of the present application;

[0067] Figure 4 for Figure 3 The enlarged view of point A in the middle;

[0068] Figure 5 A schematic diagram of the matching of the end cover and the insulating member of the battery cell provided in some embodiments of the present application;

[0069] Figure 6 for Figure 3 A top view of the cooperation between the first adapter and the end cover of the provided battery cell;

[0070] Figure 7 for Figure 3 A schematic diagram of a second adapter of a battery cell is provided.

[0071] Among them, the reference numerals in the figure are:

[0072] 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; 14-transfer piece; 1401-positioning hole; 14a-first transfer piece; 14b-second transfer piece; 15-insulating piece; 1501-through hole; 15a-first insulating piece; 15b-second insulating piece; 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] Embodiments of the present application are described in detail below, and examples of the embodiments 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 the present 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 drawings, and are only for the convenience of describing the present 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 should not be understood as a limitation on the present application.

[0075] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0076] In the description of the present application, "plurality" means more than two, and unless otherwise clearly and specifically defined, "more than two" includes two. Accordingly, "multiple groups" means more than two groups, including two groups.

[0077] In the description of this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0078] In the description of this application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists, A and B exist at the same time, and B exists. In addition, in this application, the character " / " generally indicates that the associated objects before and after 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 parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned 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 includes all technical solutions falling within the scope of the claims.

[0080] In the related art, a battery cell may generally include a housing, an electrode assembly, an electrode terminal and an adapter. The electrode assembly and the adapter are both arranged in the internal environment defined by the housing, and the electrode terminal is arranged in the housing. The adapter is welded to the electrode lug and the electrode terminal of the electrode assembly respectively to achieve conduction between the electrode assembly and the electrode terminal. In this way, the adapter can achieve flow between the electrode assembly and the electrode terminal.

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

[0082] In some cases, the adapter generates heat when there is an overcurrent, and the heat generated by the adapter will be transferred to the insulating part. Therefore, when the battery cell is used for a long time, there is a risk that the insulating part will be melted and the insulating performance of the insulating part will fail. In particular, when a short circuit occurs in the battery cell, the current inside the adapter increases sharply, and the energy is released sharply, so the temperature inside the adapter increases sharply, which can easily transfer the heat to the insulating part, causing the insulating performance of the insulating part to fail, and then causing a short circuit inside the battery cell.

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

[0084] Therefore, the heat on the transition piece will be transferred to the insulating piece, so that the insulating piece is at risk of being melted by the transition piece, resulting in failure of the insulating performance.

[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 insulation 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 casing.

[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] The electrical device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc. The vehicle may be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc.

[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, wherein the energy storage device may be an energy storage container, an energy storage cabinet, and the like.

[0089] The battery involved in the embodiment of the present application can be a single physical module including 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, in parallel or in hybrid connection through a busbar component. Hybrid connection means that multiple battery cells are connected in both series and in parallel.

[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. As an example, the multiple battery cells may be fixed to form a battery module by rolling strips, etc. As an example, the multiple battery cells may also be fixed to form a battery module by end plates, side plates, etc.

[0091] In some embodiments, the battery may be a battery pack, which may include a box and a battery cell. As an example, the battery cell may be directly accommodated in the box. As an example, the battery cell may also be formed into a battery module first and then accommodated in the box.

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

[0093] See also Figure 1 , Figure 1 Schematic diagram of a vehicle 1000 provided for some embodiments of the present application. The above-mentioned battery 100 is disposed inside the vehicle 1000, and the battery 100 can be disposed 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 be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for the starting, navigation, and working power requirements of the vehicle 1000 during driving.

[0094] In some embodiments, the battery 100 can be used 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] See also Figure 2 , Figure 2 An exploded view of a battery 100 provided for 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 having a storage space inside, and the housing 20 may adopt a variety of structures. In some embodiments, the housing 20 may include a first portion 21 and a second portion 22, which cover each other and jointly define the above-mentioned storage space. The first portion 21 may be a hollow structure having an opening at one end, and the second portion 22 is a plate-like structure, and 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 above-mentioned storage space; or, the first portion 21 and the second portion 22 may both be hollow structures having an opening at one end, such as Figure 2 As shown, the opening side of the first part 21 covers the opening side of the second part 22, so that the first part 21 and the second part 22 jointly define the above-mentioned accommodation space. Among them, the box body 20 composed of the first part 21 and the second part 22 can be of various shapes, such as a cylinder, a cuboid, etc.

[0096] In some embodiments, a plurality of battery cells 10 may be connected in series, in parallel or in mixed connection to form a whole, and then the whole formed by the plurality of battery cells 10 may be directly accommodated in the above-mentioned accommodation space of the box body 20, such as Figure 2 Multiple battery cells 10 can also be connected in series, parallel or mixed, and arranged and fixed to form multiple battery modules, and then multiple battery modules are connected in series, parallel or mixed to form a whole, and accommodated in the above-mentioned accommodation space of the box body 20.

[0097] In some embodiments, please combine Figure 1 and Figure 2 When the battery 100 is applied to the vehicle 1000, the box 20 of the battery 100 can be used as a part of the chassis structure of the vehicle 1000. For example, part of the box 20 can become at least a part of the chassis of the vehicle 1000, or part of the box 20 can become at least a part of the cross beam and the longitudinal beam of the vehicle 1000.

[0098] The battery cell 10 refers to the smallest unit for storing and outputting electric energy. The battery cell 10 may be a secondary battery or a primary battery. The battery cell 10 may 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 may be cylindrical, flat, rectangular, or in other shapes.

[0099] See also Figure 3 , Figure 3 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 mainly formed by winding or stacking positive and negative electrode sheets, and a separator is provided between the positive and negative electrode sheets. The parts of the positive and negative electrode sheets with active materials constitute the main body 111 of the electrode assembly 11, and the parts of the positive and negative electrode sheets without 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 can be located together at one end of the main body 111 or respectively 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 plays a role in conducting ions between the positive electrode plate and the negative electrode plate. The electrolyte involved in the embodiments of the present application may be liquid, gel or solid.

[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. The end cap 122 is covered 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. When the electrode assembly 11 needs to be packaged after the electrode assembly 11 is placed in the shell, the end cap 122 covers the shell 121.

[0105] The number of the end cap 122 may be one. The number of the end cap 122 may also be 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, which may be determined according to the specific shape and size of the electrode assembly 11. In addition, the shell 121 and the end cap 122 may be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, or the like.

[0107] In some embodiments, please refer to Figure 3 The battery cell 10 may further include an electrode terminal 13. The electrode terminal 13 refers to a component having a conductive property, and the electrode terminal 13 serves as a current transmission end of the battery cell 10 for transmitting current. The electrode terminal 13 may be, but is not limited to, a pole.

[0108] The electrode terminal 13 is connected to the tab 112. Specifically, the electrode terminal 13 can be directly connected to the tab 112, such as by welding. An adapter 14 can also be provided between the electrode terminal 13 and the tab 112, and the adapter 14 realizes the connection between the electrode terminal 13 and the tab 112 so as to enable current flow, thereby indirectly realizing the connection between the electrode terminal 13 and the tab 112.

[0109] The adapter 14 refers to 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 respectively. 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 disposed on the housing 12. Specifically, the electrode terminal 13 can be disposed on the housing 121 of the housing 12, or on the end cap 122 of the housing 12. For example, the positive electrode terminal and the negative electrode terminal can be disposed on the housing 121 at the same time; or Figure 3 As shown, the positive electrode terminal and the negative electrode terminal are both disposed on the end cover 122 ; or, one of the positive electrode terminal and the negative electrode terminal is disposed on the shell 121 , and the other is disposed on the end cover 122 .

[0112] The positive electrode terminal and the negative electrode terminal may be disposed at the same end of the housing 12; or Figure 3 As shown, the positive electrode terminal and the negative electrode terminal can be disposed at opposite ends of the housing 12 .

[0113] In some embodiments, see Figure 3 The battery cell 10 may further include a lower plastic. The lower plastic is a plastic part, which is mainly used to be arranged in the internal environment of the battery cell 10 to play an insulating role.

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

[0115] There may 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 also read Figure 3 and Figure 4 , and combined with other drawings. Among them, Figure 4 for Figure 3 The enlarged view of point A in the middle. Figure 4 In the enlarged view, the relationship between the first wall 122a, the first pole ear 112a, the first insulating member 15a, and the first adapter 14a involved below is mainly illustrated. 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, 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 is electrically conductive with the electrode assembly 11. 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 is electrically conductive with the electrode terminal 13. 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 and the like. Welding may include but is not limited to one or more of laser welding, ultrasonic welding, penetration welding and the like.

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

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

[0122] like Figure 3 and Figure 4 As shown, at least part of the insulating member 15 is located between the wall of the housing 12 along the first direction Z and the adapter 14, so that at least part of the insulating member 15 can separate the adapter 14 and the wall of the housing 12 along the first direction Z at least along the first direction Z, thereby achieving insulation between the adapter 14 and the housing 12. Figure 3 and Figure 4 A plane coordinate system is schematically shown in FIG. 1 , in which the X axis and the Z axis are two mutually perpendicular coordinate axes in the plane coordinate system, that is, the Z axis is perpendicular to the X axis. The first direction Z is parallel to the Z axis.

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

[0124] Among some possible designs, such as Figure 3 and Figure 4 As shown, the electrode terminal 13 is disposed on a wall of the housing 12 along the first direction Z. In some 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 may be a housing 121 or an end cover 122. Figure 3 As shown, two opposite walls of the outer shell 12 along the first direction Z may both be end covers 122; or, two opposite walls of the outer shell 12 along the first direction Z may both be shells 121; or, one of the walls of the outer shell 12 along the first direction Z is the shell 121, and the other wall is the end cover 122.

[0126] like Figure 3 As shown, there are two pole tabs 112, and the two pole tabs 112 are respectively a first pole tab 112a and a second pole tab 112b. As an example, the first pole tab 112a is a positive pole tab, and the second pole tab 112b is a negative pole tab; of course, the first pole tab 112a can also be a negative pole tab, and the second pole tab 112b is a positive pole 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 the electrode terminal 13, the adapter 14 and the insulating member 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 can be 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: the first situation is that the number of electrode terminals 13, the number of adapters 14 and the number of insulating members 15 are all one; the second situation is that Figure 3 and Figure 4 As shown, the number of electrode terminals 13, the number of adapters 14 and the number of insulating members 15 are all two; the third type, the number of electrode terminals 13 and the number of adapters 14 are all two, and the number of insulating members 15 is one.

[0129] When the number of electrode terminals 13, the number of adapters 14, and the number of insulating members 15 are all one, the electrode terminal 13 may be the first electrode terminal 13a, the adapter 14 is the first adapter 14a, and the insulating member 15 is the first insulating member 15a. The first adapter 14a is conductively connected to the first electrode tab 112a, the first adapter 14a is conductively connected to the first electrode terminal 13a, and at least part 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. The electrode terminal 13 may also be the second electrode terminal 13b, the adapter 14 is the second adapter 14b, and the insulating member 15 is the second insulating member 15b. The second adapter 14b is conductively connected to the second pole ear 112b, and the second adapter 14b is conductively connected to the second electrode terminal 13b, and at least part of the second insulating member 15b is located between the second adapter 14b and the wall of the shell 12 along the first direction Z to achieve insulation between the shell 12 and the second adapter 14b.

[0130] When the number of electrode terminals 13, the number of adapters 14 and the number of insulating members 15 are all two, such as Figure 3 and Figure 4 As shown, the two electrode terminals 13 are respectively the first electrode terminal 13a and the second electrode terminal 13b, the two adapters 14 are respectively the first adapter 14a and the second adapter 14b, and the two insulating members 15 are respectively the first insulating member 15a and the second insulating member 15b. Among them, the first adapter 14a is conductively connected with the first pole ear 112a, and the first adapter 14a is conductively connected with the first electrode terminal 13a. The second adapter 14b is conductively connected with the second pole ear 112b, and the second adapter 14b is conductively connected with the second electrode terminal 13b. At least part of the first insulating member 15a is located between the first adapter 14a and the wall of the shell 12 along the first direction Z to achieve insulation between the first adapter 14a and the shell 12. At least part of the second insulating member 15b is located between the second adapter 14b and the wall of the shell 12 along the first direction Z to achieve insulation between the shell 12 and the second adapter 14b.

[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. Among them, the first adapter 14a is conductively connected to the first pole lug 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 pole lug 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, and at least part of the first insulating member 15a is located between the first adapter 14a and the wall of the shell 12 along the first direction Z to achieve insulation between the first adapter 14a and the 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 wall of the housing 12 along the first direction Z includes 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 along the first direction Z between the first wall 122a and the first adapter 14a.

[0134] At least part of the second insulating member 15b is located between the outer shell 12 and the second adapter 14b, which means that at least part 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 part 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 may be provided on the housing 121 or the end cover 122. The second wall 122b may be provided on the housing 121 or the end cover 122. As an example, Figure 3 As shown, the first wall 122 a and the second wall 122 b are both disposed on the end cover 122 .

[0136] Among some possible designs, such as Figure 3As shown, the first wall 122a and the second wall 122b mentioned above may be two opposite walls of the housing 12 along the first direction Z. Based on this, the first pole ear 112a and the second pole ear 112b are respectively arranged at the opposite ends of the electrode assembly 11 along the first direction Z, the first adapter 14a and the second adapter 14b are also respectively arranged at the 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 arranged at the 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 arranged at the opposite ends of the electrode assembly 11 along the first direction Z. In addition, 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 pole tab 112a and the second pole tab 112b are arranged 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 arranged 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 arranged 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 arranged at the same end of the electrode assembly 11 along the first direction Z.

[0138] At least part of the insulating member 15 is spaced apart from the adapter 14, which means that at least part of the insulating member 15 is spaced apart from the adapter 14, but not in direct contact with the adapter 14. The space formed between at least part 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 part 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 ; it may also include a situation where a part of the insulating member 15 is spaced apart from the adapter 14 , and another part 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 member 15 by distributing at least a portion of the insulating member 15 at intervals from the adapter 14, thereby improving the problem of heat from the adapter 14 being conducted to the insulating member 15, causing the insulating performance of the insulating member 15 to fail. In this way, the insulating member 15 can achieve a good insulation effect between the adapter 14 and the outer shell 12.

[0141] It can be understood that the adapter 14 involved in each embodiment of the present application can be the first adapter 14a or the second adapter 14b; the pole lug 112 can be the first pole lug 112a or the second pole lug 112b; the electrode terminal 13 can be the first electrode terminal 13a or the second electrode terminal 13b; the insulating member 15 can be the first insulating member 15a or the second insulating member 15b. Moreover, when the pole lug 112 is the first pole lug 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 pole lug 112 is the second pole lug 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, Figure 3 As shown, 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.

[0143] In some embodiments, please refer to Figure 3 and Figure 4 At least part of the insulating member 15 may also 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 may also achieve insulation performance between the electrode assembly 11 and the housing 12.

[0144] In some embodiments, please refer to Figure 3 and Figure 4 , and in combination with other drawings. The adapter 14 is disposed at the end of the electrode assembly 11 along the first direction Z. The insulating member 15 includes a body portion 151, and 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 the main body 151 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 that the adapter 14 is disposed at the end of the electrode assembly 11 along the first direction Z, and the main body 151 is 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 disposed between the wall of the housing 12 along the first direction Z and the electrode assembly 11, and the electrode assembly 11 is disposed 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 facing 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 body portion 151.

[0149] It should be noted that if Figure 4 As shown, Figure 4 The positional relationship among the first wall 122a, the first pole ear 112a, the first insulating member 15a, and the first adapter 14a mentioned below is mainly illustrated. 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 close to the first adapter 14a 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 first wall 122a of the housing 12 and the first adapter 14a along the first direction Z. In addition, 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, that is, 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, that is, 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. In addition, the main body 151 of the second insulating member 15b and the second adapter 14b are arranged at intervals 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 spaced apart 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 failure of the main body 151.

[0152] In some embodiments, please refer to Figures 3 to 5 , and combined with other drawings. Among them, Figure 5A schematic diagram of the matching of the end cap 122, the first insulating member 15a and the first electrode terminal 13a of the 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 one side of the body 151 along the first direction Z toward the electrode assembly 11. The adapter 14 and the first boss 152 are spaced apart along the second direction X, and the second direction X intersects with the first direction Z.

[0153] The first boss 152 is a component disposed on one side of the body 151 along the first direction Z toward the electrode assembly 11, which is a part of the insulating member 15 and also has insulating properties. The first boss 152 is used to constrain the isolation film wrapped around the electrode assembly 11 to ensure the insulation effect of the isolation film on the electrode assembly 11 and the housing 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, so that the first adapter 14a is located on the side of the main body 151 of the first insulating member 15a facing 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 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 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 body 151 of the second insulating member 15b is located between the second wall 122b of the housing 12 and the second adapter 14b, so that the second adapter 14b is located on the side of the body 151 of the second insulating member 15b facing 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 arranged on the side of the body 151 of the second insulating member 15b facing 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, intersection means non-parallel. The two directions of intersection are non-parallel, that is, the two directions form an angle greater than 0° and less than 180°. The two directions can be perpendicular or non-perpendicular, and the two directions can be respectively set on two planes that are not parallel to each other, or on the same plane.

[0157] The second direction X refers to a direction intersecting with the first direction Z. Specifically, the second direction X intersecting with the first direction Z 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 can form an angle greater than 0° and less than 180°. Among them, the first direction Z and the second direction X can be perpendicular to each other or not. The first direction Z and the second direction X can be directions intersecting on the same plane, or directions on planes that are not in the same plane, and the projection of the second direction X on the plane where the first direction Z is located can intersect with the first direction Z.

[0158] in, Figure 5 A spatial coordinate system is shown in FIG. 1 , in which the X-axis, Y-axis and Z-axis are three coordinate axes that are perpendicular to each other, that is, 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. Figure 3 and Figure 4 The plane coordinate system shown in Figure 5 The plane coordinate system formed by the X-axis and Z-axis of the spatial coordinate system in .

[0159] As an example, Figure 3 and Figure 4 As shown, 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 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 refer to Figures 3 to 5 , and in combination with other drawings. The wall of the housing 12 along the first direction Z is provided with a liquid injection hole 1201. The insulating member 15 further includes a boss 153, which is disposed on the side of the body 151 along the first direction Z toward the electrode assembly 11. The boss 153 is connected to the liquid injection hole 1201 and is connected to the inside of the housing 12. The adapter 14 and the boss 153 are spaced apart along the second direction X, and the second direction X intersects with the first direction Z.

[0162] The injection hole 1201 refers to 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 on the shell 121 of the outer shell 12, or on the end cover 122 of the outer shell 12.

[0163] The protruding column 153 refers to a component disposed on one side of the main body 151 along the first direction Z toward the electrode assembly 11 , is a part of the insulating member 15 , and also has insulating properties.

[0164] It can be understood that the insulating member 15 is provided with a through hole 1501, and the through hole 1501 penetrates the main body 151 and the protrusion 153 of the insulating member 15 along the first direction Z. The through hole 1501 is connected to the internal environment of the battery cell 10 and is connected to the injection hole 1201. In addition, the injection hole 1201 is used to communicate with the external environment of the battery cell 10. In this way, the external electrolyte can enter the internal environment of the battery cell 10 through the injection hole 1201 and the through hole 1501 in turn, so as to infiltrate the electrode assembly 11.

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

[0166] The convex column 153 has various functions. For example, in some possible designs, the convex column 153 can be used to buffer the electrolyte passing through the injection hole 1201 to improve the problem that the electrolyte pressure is too high and the electrode assembly 11 is damaged. For example, in some possible designs, the convex column 153 can be used to guide the electrolyte passing through the injection hole 1201 so that the electrolyte enters the electrode assembly 11 faster.

[0167] It should be noted that if Figures 3 to 5 As shown, in the first direction Z, the 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 body 151 facing the electrode assembly 11 along the first direction Z. Based on this, the convex column 153 and the adapter 14 are both arranged on the side of the body 151 facing the electrode assembly 11 along the first direction Z, and the convex column 153 and the adapter 14 are spaced apart along the second direction X.

[0168] As an example, Figures 3 to 5 As shown, the first pole tab 112a is a positive pole tab, and the 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 injection hole 1201 is opened in the first wall 122a. The first insulating member 15a also includes a convex column 153, and the convex column 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 convex column 153 of the first insulating member 15a and the first adapter 14a are arranged at intervals 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, so as to improve the problem that the heat of the adapter 14 causes the insulation performance of the insulating member 15 to fail.

[0170] It is necessary to add that, Figures 3 to 5 As shown, the first bosses 152 and the bosses 153 are distributed along the second direction X at intervals.

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

[0172] In some embodiments, please refer to Figure 3 , the wall of the housing 12 having the second insulating member 15b along the first direction Z may not be provided with the injection hole 1201, that is, the second wall 122b is not provided with the injection hole 1201. In this case, the insulating member 15 may not be provided with the protruding column 153 and the second boss 154. That is, the second adapter 14b may be provided with the above-mentioned first boss 152 at one end or both opposite ends along the second direction X, and in the second direction X, the first bosses 152 at the 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 a main body 151 of the insulating member 15 spaced apart from the adapter 14 along the first direction Z, and may also include a first boss 152 of the insulating member 15 spaced apart from the adapter 14 along the second direction X, and may also include a 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, and the “portion of the insulating member 15” may include at least one of the above-mentioned body portion 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 has 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 refer to the explanation of the intersection of the first direction Z and the second direction X, which will not be repeated here. As an example, the third direction Y is parallel to the Y axis.

[0178] In some embodiments, please refer to Figures 3 to 5 , and in combination with other drawings. The 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 part of the insulating member 15 is spaced apart from the adapter 14 to form a gap, which 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 boss 152 of the insulating member 15 and the adapter 14 are spaced apart from each other 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 member 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 an arrangement allows a larger gap to be provided 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 , thereby facilitating improvement of the problem of insulation performance failure of the insulating member 15 due to heat from the adapter 14 .

[0185] In some embodiments, please refer to Figures 3 to 5 , and in combination with other drawings. The 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 0.1 mm and less than 2 mm, and can be 0.2 mm, 0.5 mm, 0.8 mm, 1 mm, 1.2 mm, 1.4 mm, 1.5 mm, 1.8 mm, 1.9 mm, 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 by 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] Such arrangement allows a relatively large gap between at least a portion of the insulating member 15 and the adapter 14, but not too large. In this way, on the basis of being able to improve the problem of the insulation performance of the insulating member 15 being invalidated due to the heat of the adapter 14, the distribution compactness of the adapter 14 and the insulating member 15 can also be improved, thereby helping to achieve the compactness of the structure of the battery cell 10 and improve the energy density of the battery cell 10.

[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 pole tab 112a is welded to the first adapter 14a, and the second pole tab 112b is welded to the second adapter 14b.

[0195] By welding the electrode assembly 11 and the adapter 14 , the electrode assembly 11 and the adapter 14 can be connected to each other, so as to achieve the connection between the electrode assembly 11 and the electrode terminal 13 .

[0196] In some embodiments, please refer to Figure 3 and Figure 4 , and in combination 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 for welding with the electrode assembly 11 to achieve conductive connection between the adapter 14 and the electrode assembly 11. During welding of the electrode assembly 11 and the adapter 14, the temperature of the portion of the adapter 14 used for welding with 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 arranged on the portion of the adapter 14 used for welding with the electrode assembly 11 .

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

[0201] In some embodiments, please refer to Figure 3 and Figure 6 , and combined with other drawings. Among them, Figure 6 A schematic diagram of the matching of the end cap 122 and the first adapter 14a of the battery cell 10 provided in some embodiments of the present application is a view of the end cap 122 and the first adapter 14a in the direction of the second adapter 14b pointing to the first adapter 14a along the first direction Z, and the schematic diagram shows the projection of the first electrode terminal 13a, the first connecting portion 1121a and the second connecting portion 1122a on the first adapter 14a through dotted lines. The adapter 14 is provided with a positioning hole 1401, and the electrode terminal 13 is inserted into the positioning hole 1401.

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

[0203] Among some possible designs, such as Figure 3 and Figure 6 As shown, the first adapter 14a is provided with the above-mentioned positioning hole 1401, and the first electrode terminal 13a is plugged into the positioning hole 1401 of the first adapter 14a. In some possible designs, the second adapter 14b may also be provided with the above-mentioned positioning hole 1401, and the second electrode terminal 13b is plugged into the positioning hole 1401 of the second adapter 14b. In some possible designs, the first adapter 14a and the second adapter 14b are both provided with the above-mentioned positioning hole 1401, the first electrode terminal 13a is plugged into the positioning hole 1401 on the first adapter 14a, and the second electrode terminal 13b is plugged into the positioning hole 1401 on the second adapter 14b.

[0204] By inserting the electrode terminal 13 into the positioning hole 1401 , it is convenient to position the electrode terminal 13 on the battery cell 10 , and it is also convenient to realize the conductive connection between the electrode terminal 13 and the adapter 14 .

[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, and the welding process is simple, only welding is required, which is easy to implement and low in cost.

[0206] In some embodiments, please refer to Figure 3 and Figure 6 The electrode assembly 11 is welded to the adapter 14 , and the weld marks formed by welding the electrode assembly 11 to the adapter 14 are spaced apart from the positioning holes 1401 .

[0207] It can be understood that after the tab 112 of the electrode assembly 11 is welded to the adapter 14 to form conduction, a weld mark is formed between the tab 112 and the adapter 14. The weld mark refers to a structure formed by the solidification of the solder used in the welding process of 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 A plane coordinate system is shown in FIG. 1 , where the X-axis and the Y-axis are two perpendicular coordinate axes of the plane coordinate system, that is, the X-axis is perpendicular to the Y-axis. And, Figure 6 The plane coordinate system is Figure 5 The plane coordinate system composed of the X-axis and Y-axis of the spatial coordinate system.

[0210] As an example, Figure 6As shown, the weld mark formed after the first pole tab 112a and the first adapter 14a are welded is spaced apart from the positioning hole 1401 on the first adapter 14a. In addition, the weld mark formed after the first pole tab 112a and the first adapter 14a are welded may include the first connecting portion 1121a mentioned below, and may also include the first connecting portion 1121a and the second connecting portion 1122a mentioned below. Of course, when the second adapter 14b is also provided with a positioning hole 1401, the weld mark formed after the second pole tab 112b and the second adapter 14b are welded may also be spaced apart from the positioning hole 1401 on the second adapter 14b. In addition, the weld mark formed after the second pole tab 112b and the second adapter 14b are welded may include the third connecting portion 1121b mentioned below, and may also include the third connecting portion 1121b and the fourth connecting portion 1122b mentioned below.

[0211] Such a configuration can improve the problem of solder used in the welding process of the pole tab 112 and the adapter 14 flowing into the positioning hole 1401, and further improve the problem that the welding process of the pole 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 Figure 3 , Figure 6 and Figure 7 , and combined with other drawings. Among them, Figure 7 A schematic diagram of a second adapter 14b of a 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 of the first adapter 14a pointing to the second adapter 14b along the first direction Z, and the schematic diagram shows the projection of the second electrode terminal 13b, the third connection portion 1121b and the fourth connection portion 1122b on the second adapter 14b through dotted lines. The electrode assembly 11 includes a main body 111 and a pole ear 112 provided on the main body 111. The pole ear 112 includes a plurality of sub-pole ears 112, and the plurality of sub-pole ears 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-electrode tab 112 is a partial structure of the electrode tab 112 , and a plurality of sub-electrode tabs 112 can constitute the electrode tab 112 . The sub-electrode tab 112 is connected to the main body 111 .

[0214] It should be noted that when the tab 112 is welded to the adapter 14, the multiple sub-tabs 112 of the tab 112 may be pre-welded first, and a first weld mark is formed on the tab 112 after the multiple sub-tabs 112 of the tab 112 are pre-welded. Then, at least a portion of the first weld mark is welded to the adapter 14, and at least a portion of the first weld mark is welded to the adapter 14 to form a second weld mark 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 pole tab 112 may be a first pole tab 112a or a second pole tab 112b. Both the first pole tab 112a and the second pole tab 112b may include a sub-pole tab 112, wherein the sub-pole tab 112 of the first pole tab 112a is the first sub-pole tab 112, and the sub-pole tab 112 of the second pole tab 112b is the second sub-pole tab 112. That is, a plurality of first sub-pole tabs 112 form the first pole tab 112a, and a plurality of second sub-pole tabs 112 form the second pole 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] like Figure 6 As shown, a 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 transition piece 14a to form a second weld mark between the first weld mark on the first tab 112a and the first transition piece 14a.

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

[0220] As an example, Figure 6 As shown, the first weld mark of the first pole 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 is also provided with a positioning hole 1401, the first weld mark of the second pole 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 is necessary to add here that Figure 7 The plane coordinate system is Figure 5The plane coordinate system composed of the X-axis and Y-axis of the spatial coordinate system.

[0222] By adopting the above technical solution, the weld mark formed by welding the electrode assembly 11 and the adapter 14 can include a second weld mark, and the second weld mark is spaced apart from the positioning hole 1401, so that the problem of the solder used in the welding process of the pole tab 112 and the adapter 14 flowing into the positioning hole 1401 can be improved, and further the problem that the welding process of the pole tab 112 and the adapter 14 will interfere with the positioning function of the positioning hole 1401 on the electrode terminal 13 can be improved, thereby facilitating the assembly of the battery cell 10. In addition, the first weld mark is formed by welding a plurality of sub-pole tabs 112 of the pole tab 112, which facilitates the welding operation of the pole tab 112 and the adapter 14.

[0223] In some embodiments, a plurality of sub-electrode tabs 112 are welded and welded with 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-electrode 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] With such arrangement, during the welding process of the plurality of sub-electrode tabs 112, the tabs 112 are also welded to the adapter 14, thus increasing the number of welding times between the tabs 112 and the adapter 14, and improving the conduction strength between the adapter 14 and the tabs 112. In addition, the first weld marks are also spaced apart from the positioning holes 1401, so that during the welding process of the sub-electrode tabs 112 and the adapter 14, the solder is not easy to flow into the positioning holes 1401, thereby improving the problem that the welding process between the tabs 112 and the adapter 14 will interfere with the positioning function of the positioning holes 1401 on the electrode terminals 13, thereby facilitating the assembly of the battery cell 10.

[0227] In some embodiments, please refer to Figure 3 and Figure 6 , and in combination with other drawings. The minimum spacing between the welding mark formed by welding the electrode assembly 11 and the adapter 14 and the positioning hole 1401 is 0.2-6 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, Figure 6As shown, during the welding process of the plurality of first sub-electrode tabs 112, the first weld mark is also welded with the first adapter 14a to form a first weld mark, and at least part of the first weld mark is welded with the first adapter 14a to form a second weld mark. At this time, the weld mark formed by welding the electrode assembly 11 and the adapter 14 may include the first weld mark and the 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] When the first sub-electrode tabs 112 are welded to form the first weld mark, they are not welded to the first adapter 14a. Instead, after welding, at least part of the first weld mark is welded to the first adapter 14a to form the second weld mark. At this time, the weld mark formed by welding 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 welding 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] Such arrangement allows the minimum spacing between the weld mark formed by welding the electrode assembly 11 and the adapter 14 and the positioning hole 1401 to have a suitable range, which can improve the problem of solder flowing into the positioning hole 1401 during the welding process of the electrode assembly 11 and the adapter 14, thereby improving 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 on the electrode terminal 13. On the other hand, the weld mark, the positioning hole 1401, etc. formed by welding the electrode assembly 11 and the adapter 14 can be compactly distributed on the adapter 14, so that the size of the adapter 14 can be reduced.

[0233] In some embodiments, please refer to Figure 3 and Figure 6, and in combination with other drawings. The electrode assembly 11 includes a main body 111 and a pole ear 112 provided on the main body 111, the pole ear 112 includes a first pole ear 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 pole ear 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 ear 112a to form a plurality of spaced apart first connecting portions 1121a.

[0234] The first connection 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 connection 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 pole 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 pole tab 112a refers to the second weld mark mentioned above.

[0236] The first pole lug 112a is conductively connected to the first adapter 14a to form a plurality of first connecting portions 1121a that are spaced apart, so that the first pole lug 112a is connected to a plurality of different positions of the first adapter 14a. In this way, on the one hand, the current distribution between the first adapter 14a and the first pole lug 112a can be more uniform, so that the overcurrent temperature of the first adapter 14a can be reduced to improve the problem of heat concentration caused by current concentration in the first adapter 14a, and further improve the problem of the insulation performance failure of the first insulating member 15a caused by excessive heat in the first adapter 14a. On the other hand, a greater overcurrent capacity can be provided between the first adapter 14a and the first pole lug 112a.

[0237] In some embodiments, please refer to Figure 3 and Figure 6 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 refers to 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 injection hole 1201. As an example, Figure 6As shown, the first connection portion 1121a is located on the side of the first electrode terminal 13a away from the injection hole 1201 along the second direction X. That is, in the second direction X, the first electrode terminal 13a is located between the injection hole 1201 and the first connection portion 1121a, and the connection line (straight line) between the injection hole 1201 and the first connection portion 1121a can pass through the first electrode terminal 13a. In addition, multiple first connection portions 1121a are located on the same side of the first electrode terminal 13a away from the injection hole 1201 along the second direction X, that is, the connection line (straight line) between any two adjacent first connection portions 1121a does not pass through the first electrode terminal 13a.

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

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

[0242] In some embodiments, when the area of ​​the first adapter 14a is large enough, the plurality of first connection parts 1121a can be distributed on opposite sides of the first electrode terminal 13a, specifically, at least part of the first connection part 1121a of the first electrode terminal 13a is disposed between two first connection parts 1121a, that is, the connection line (straight line) of the two first connection parts 1121a can pass through the first electrode terminal 13a. In this way, the current distribution of the first adapter 14a can be made more uniform, and the risk of insulation performance failure of the first insulating member 15a can be reduced.

[0243] In some embodiments, please refer to Figures 3 to 6 , and in combination with other drawings. A first wall 122a is provided on one side of the housing 12 along the first direction Z, and the first electrode terminal 13a and the injection hole 1201 are spaced apart from each other on the first wall 122a.

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

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

[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 compactness of the structure of the battery cell 10 .

[0247] In some embodiments, please refer to Figure 3 and Figure 6 , and in combination with other drawings. The first pole tab 112a includes a plurality of first sub-pole tabs 112, and the plurality of first sub-pole tabs 112 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 connection portion 1122 a refers to a structure formed by connecting a plurality of first sub-electrode tabs 112 , and the second connection portion 1122 a is disposed on the first electrode tab 112 a .

[0249] It should be noted that when the plurality of first sub-electrode tabs 112 are connected by welding, the plurality of first sub-electrode 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, in the process of conducting the first pole tab 112a and the first adapter 14a, the plurality of first sub-pole tabs 112 can be connected to form the second connection portion 1122a, and then at least a portion of the second connection portion 1122a can be conducted and connected to the first adapter 14a, so that the first pole tab 112a and the first adapter 14a are conducted and connected. In this way, the first pole tab 112a can be better conducted and connected to the first adapter 14a.

[0251] In some embodiments, please refer to Figure 3 and Figure 7 , and in combination with other drawings. The pole tab 112 further includes a second pole 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 pole 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, the number of adapters 14, and the number of insulating members 15 are all two, the two electrode terminals 13 are respectively the first electrode terminal 13a and the second electrode terminal 13b, the two adapters 14 are respectively the first adapter 14a and the second adapter 14b, and the two insulating members 15 are respectively the first insulating member 15a and the second insulating member 15b. Among them, the first adapter 14a is conductively connected to the first pole lug 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 pole lug 112b, and the second adapter 14b is conductively connected to the second electrode terminal 13b. At least part of the first insulating member 15a is located between the first adapter 14a and the inner wall of the shell 12 to achieve insulation between the first adapter 14a and the shell 12. At least part of the second insulating member 15b is arranged between the second adapter 14b and the shell 12 to achieve insulation between the shell 12 and the second adapter 14b.

[0253] With such arrangement, an insulating member 15 can be disposed 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 Figure 3 and Figure 7 , and in combination with other drawings. The pole tab 112 further includes a second pole tab 112b, the electrode terminal 13 further includes a second electrode terminal 13b, and the adapter 14 further includes a second adapter 14b, and the second adapter 14b is conductively connected to the second pole tab 112b and the second electrode terminal 13b. The second pole tab 112b is conductively connected to the second adapter 14b to form a plurality of third connection portions 1121b distributed at intervals.

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

[0256] It should be noted that when the second adapter 14b and the second pole 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 pole tab 112b refers to the second weld mark mentioned above.

[0257] The second pole lug 112b is conductively connected to the second adapter 14b to form a plurality of spaced third connection portions 1121b, so that the second pole lug 112b is connected to a plurality of different positions of the second adapter 14b. In this way, on the one hand, the current distribution between the second adapter 14b and the second pole lug 112b can be more uniform, so that the overcurrent temperature of the second adapter 14b can be reduced to improve the problem of heat concentration caused by current concentration in the second adapter 14b, and further improve the problem of insulation performance failure of the second insulating member 15b caused by excessive heat in the second adapter 14b. On the other hand, the second adapter 14b and the second pole lug 112b can have a larger overcurrent capacity.

[0258] In some embodiments, see Figure 7 , and in combination with other drawings. 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 connection line (straight line) of the two third connection portions 1121 b may pass through the second electrode terminal 13 b .

[0260] As an example, Figure 7 As shown, the two third connection parts 1121b are spaced apart along the second direction X. Moreover, a portion of the second electrode terminal 13b is located between the two third connection parts 1121b, so that one of the third connection parts 1121b, a portion of the second electrode terminal 13b, and the other third connection part 1121b are sequentially distributed along the second direction X, so that the two third connection parts 1121b are disposed on opposite sides of the second electrode terminal 13b along the second direction X. Of course, in other examples, the two

[0261] The third connection portions 1121 b may also be distributed at intervals along directions respectively crossing the first direction Z and the second direction X, and at least a portion of the second electrode terminal 13 b is located between two third connection portions 1121 b.

[0262] Such an arrangement allows the multiple positions of the second adapter 14b for connecting to the second pole ear 112b to be more dispersed, which can make the current inside the battery cell 10 more uniform, thereby reducing the overcurrent temperature of the second adapter 14b, and further reducing the risk of the second adapter 14b causing the insulation performance of the second insulating member 15b to fail.

[0263] In some embodiments, see Figure 7 The second pole tab 112b includes a plurality of second sub-pole tabs 112, which are connected to form a fourth connection portion 1122b, and at least a portion of the fourth connection portion 1122b is conductively connected to the second adapter 14b to form a third connection portion 1121b.

[0264] The fourth connection portion 1122 b refers to a structure formed by connecting a plurality of second sub-electrode tabs 112 , and the fourth connection portion 1122 b is disposed on the second electrode tab 112 b .

[0265] It should be noted that, when a plurality of second sub-electrode tabs 112 are connected by welding, the fourth connection portion 1122 b formed by connecting the plurality of second sub-electrode tabs 112 refers to the first weld mark mentioned above.

[0266] Based on the above structure, in the process of conducting the second pole tab 112b and the second adapter 14b, the plurality of second sub-pole tabs 112 can be connected to form the fourth connection portion 1122b, and then at least a portion of the fourth connection portion 1122b can be conducted and connected to the second adapter 14b, so that the second pole tab 112b and the second adapter 14b are conducted and connected. In this way, the second pole tab 112b can be better conducted and connected to the second adapter 14b.

[0267] In some embodiments, see Figure 7 , and in combination with other drawings. The plurality of second sub-electrode tabs 112 are connected to form a plurality of fourth connecting portions 1122b that are spaced apart. At least a portion of each fourth connecting portion 1122b is conductively connected to the second adapter 14b to form a corresponding third connecting portion 1121b.

[0268] 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 more evenly distributed, 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.

[0269] Based on the above ideas, please refer to Figure 2 The 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 relevant description of the battery cell 10 in the previous embodiment, which will not be repeated here.

[0270] 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 insulation 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 outer shell 12, so that the battery 100 has higher reliability.

[0271] Based on the above ideas, please refer to Figure 1 The embodiment of the present application further provides an electric device, which includes a battery cell 10 or a battery 100. The battery cell 10 and the battery 100 in this embodiment are the same as the battery cell 10 and the battery 100 in the previous embodiment. For details, please refer to the relevant description of the battery cell 10 and the battery 100 in the previous embodiment, which will not be repeated here.

[0272] The electrical device provided in the embodiment of the present application adopts the battery cell 10 or battery 100 involved 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 outer shell 12, so that the battery 100 or the battery cell 10 has higher reliability.

[0273] As one of the embodiments of this application, Figures 3 to 7As shown, the 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 arranged in the housing 12. The electrode assembly 11 includes a main body 111, a first pole ear 112a and a second pole ear 112b, and the first pole ear 112a and the second pole ear 112b are respectively arranged at opposite ends of the main body 111 along the first direction Z. The two opposite walls of the housing 12 along the first direction Z are respectively a first wall 122a and a second wall 122b, the first electrode terminal 13a is arranged on the first wall 122a, and the second electrode terminal 13b is arranged on the second wall 122b. Along the first direction Z, the first adapter 14a is provided at the first pole lug 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 provided at the second pole lug 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 pole lug 112a, and the first adapter 14a is welded to the first electrode terminal 13a. The second adapter 14b is welded to the second pole lug 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.

[0274] The first adapter 14a is provided with 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 and the first adapter 14a and the positioning hole 1401 are arranged at intervals.

[0275] The first wall 122 a is provided with a liquid injection hole 1201 , and a weld mark formed by welding the first adapter 14 a and the first electrode tab 112 a is located at a side of the first electrode terminal 13 a away from the liquid injection hole 1201 .

[0276] The weld marks formed by welding the second adapter 14b and the second electrode tab 112b are disposed 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 electrode tab 112b.

[0277] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope 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) disposed in the housing (12) and at least partially located between the adapter (14) and the housing (12), wherein at least a portion of the insulating member (15) is spaced apart from the adapter (14); A gap formed between at least a portion of the insulating member (15) and the adapter member (14) is greater than 0.1 mm.

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, 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 less than 2 mm.

6. The battery cell (10) according to any one of claims 1 to 4, wherein: The electrode assembly (11) is welded to the adapter (14).

7. The battery cell (10) according to claim 6, wherein: The weld mark formed by welding the electrode assembly (11) and the adapter (14) is spaced apart from the insulating member (15).

8. The battery cell (10) according to any one of claims 1 to 4, wherein: The adapter (14) is provided with a positioning hole (1401), and the electrode terminal (13) is inserted into the positioning hole (1401).

9. The battery cell (10) according to claim 8, 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).

10. The battery cell (10) according to claim 9, 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).

11. The battery cell (10) according to claim 10, 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).

12. The battery cell (10) according to claim 9, 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.

13. The battery cell (10) according to any one of claims 1 to 4, 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.

14. The battery cell (10) according to claim 13, 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).

15. The battery cell (10) according to claim 14, 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).

16. The battery cell (10) according to claim 13, 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).

17. The battery cell (10) according to claim 13, 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).

18. The battery cell (10) according to claim 13, 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.

19. The battery cell (10) according to claim 18, wherein: At least a portion of the second electrode terminal (13b) is located between the two third connecting portions (1121b).

20. The battery cell (10) according to claim 18, 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).

21. The battery cell (10) according to claim 20, 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).

22. A battery (100), wherein: Comprising a battery cell (10) according to any one of claims 1 to 21.

23. An electrical device, wherein: Comprising a battery cell (10) according to any one of claims 1 to 21; or comprising a battery (100) according to claim 22.

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