Battery monomer, battery device and electric device

Abstract

The utility model discloses a battery monomer, a battery device and a power utilization device.The battery monomer comprises a shell which is provided with a containing cavity and a first wall; the electrode assembly is arranged in the accommodating cavity; the electrode terminal is arranged on the first wall and electrically connected with the electrode assembly, the electrode terminal comprises a conductive piece, and the conductive piece is arranged on the side, away from the electrode assembly, of the first wall; the insulating part is at least partially arranged between the conductive part and the first wall; wherein the conductive part is provided with a first surface facing the insulating part, the insulating part is provided with a second surface facing the conductive part, and the first surface and / or the second surface are / is provided with an avoiding groove; the orthographic projection of the first welding mark on the first surface or the second surface at least partially falls into the range of the avoiding groove. According to the scheme provided by the invention, when the conductive part is welded with the confluence part, heat generated at the first welding mark is not transferred to the insulating part under the limitation of the avoiding groove, so that the insulating part can be prevented from being burnt, and the reliability of the single battery is improved.

Description

Technical Field

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

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.

[0003] In the development of battery technology, how to improve the reliability of battery devices is a technical problem that urgently needs to be solved. Utility Model Content

[0004] In view of the above problems, this application provides a battery cell, a battery device, and an electrical device that can improve the reliability of the battery device.

[0005] To address the aforementioned technical problems, in a first aspect, this application proposes a single battery cell, comprising:

[0006] An outer casing having a receiving cavity, the outer casing having a first wall;

[0007] The electrode assembly is disposed within the receiving cavity;

[0008] An electrode terminal is disposed on the first wall and electrically connected to the electrode assembly. The electrode terminal includes a conductive element disposed on the side of the first wall opposite to the electrode assembly and connected to the busbar component through a first solder mark.

[0009] An insulating element is at least partially disposed between the conductive element and the first wall;

[0010] The conductive element has a first surface facing the insulating element, the insulating element has a second surface facing the conductive element, and the first surface and / or the second surface are provided with clearance grooves.

[0011] The orthographic projection of the first solder mark on the first surface or the second surface at least partially falls within the range of the clearance groove.

[0012] In the technical solution of this application embodiment, since the first surface and the second surface are provided with relief grooves, the orthographic projection of the first solder mark on the first surface or the second surface falls at least partially within the relief groove range. In this way, when the conductive component is welded to the busbar component, the heat generated at the first solder mark will not be transferred to the insulating component under the limitation of the relief groove, thereby avoiding the insulating component from being burned. This can ensure the sealing effect between the conductive component and the first wall and improve the reliability of the battery cell.

[0013] In some embodiments, a first clearance groove is provided on the first surface, and the orthographic projection of the first solder mark on the first surface falls entirely within the first clearance groove. This ensures that the size of the first clearance groove is larger than the size of the first solder mark, preventing heat generated by the first solder mark from being transferred from the edge of the first clearance groove.

[0014] In some embodiments, the depth of the first clearance groove along the first direction is D1, and the dimension of the conductive element along the first direction is D2, wherein 0 < D1 / D2 ≤ 0.5, and the first direction is the direction from the side of the conductive element away from the insulating element to the first surface. This ensures that the conductive element has a certain thickness at the first solder joint, preventing burn-through due to the thinness of the conductive element when soldering it to the busbar component.

[0015] In some embodiments, a second clearance groove is provided on the second surface, and the orthographic projection of the first solder mark on the second surface falls entirely into the second clearance groove. This ensures that the size of the second clearance groove is larger than the size of the first solder mark, preventing heat generated by the first solder mark from being transferred to the edge of the second clearance groove and causing burns to the insulating component.

[0016] In some embodiments, the depth of the second clearance groove along the first direction is D3, and the dimension of the insulating member along the first direction is D4, wherein 0 < D3 / D4 ≤ 1. Thus, when D3 equals D4, the second clearance groove penetrates the insulating member along the second direction, thereby effectively preventing the second clearance groove from receiving heat generated at the first solder joint.

[0017] In some embodiments, a groove is provided on the side of the first wall facing the conductive element, and the insulating element is located within the groove. This facilitates the fixing of the insulating element to the first wall.

[0018] In some embodiments, the insulating member includes a bottom wall and a side wall disposed around the periphery of the bottom wall, the side wall and the bottom wall forming a concave structure, and the conductive member is located within the concave structure;

[0019] A second clearance groove is provided on the second surface of the bottom wall, and the side wall abuts against the inner wall of the groove along a second direction, which is perpendicular to the first direction. This facilitates the fixing of the conductive component to the insulating component.

[0020] In some embodiments, the surface where the conductive element connects to the busbar component is a third surface, and the sidewall does not extend beyond the third surface along the first direction. This avoids the sidewall extending beyond the third surface, which could affect the welding quality between the conductive element and the busbar component.

[0021] In some embodiments, the electrode terminal further includes a connecting portion, the conductive element is provided with a first through hole, and the insulating element is provided with a second through hole;

[0022] One end of the connecting part is electrically connected to the electrode assembly, and the other end of the connecting part passes through the second through hole and the first through hole in sequence along the first direction and is then electrically connected to the conductive element.

[0023] In some embodiments, the battery cell further includes a seal at least partially located between the first wall and the connection portion. This improves the sealing performance between the first wall and the connection portion.

[0024] Secondly, this application proposes a battery device, including a battery cell and a current-combining component as described in any one of the embodiments of this application, wherein the current-combining component is connected to the conductive element via the first solder mark.

[0025] Thirdly, this application proposes an electrical device, characterized in that it includes a battery device as described in the embodiments of this application.

[0026] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0027] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the embodiments described below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0028] Figure 1 This is a schematic diagram of the structure of an electrical device provided in some embodiments of this application;

[0029] Figure 2 This application provides schematic diagrams of the battery structure for some embodiments.

[0030] Figure 3 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0031] Figure 4 This is a schematic diagram of the structure of another battery cell provided in some embodiments of this application;

[0032] Figure 5 Schematic diagram of end cap provided for some embodiments of this application;

[0033] Figure 6 for Figure 5 Enlarged diagram of point A in the diagram;

[0034] Figure 7 Schematic diagram of insulating elements provided for some embodiments of this application;

[0035] Figure 8 Schematic diagrams of conductive elements provided for some embodiments of this application;

[0036] Figure 9 for Figure 8 A diagram from another perspective.

[0037] The reference numerals in the detailed embodiments are as follows:

[0038] 1000, vehicles;

[0039] 100. Battery; 200. Controller; 300. Motor;

[0040] 110. Housing; 111. First part; 112. Second part; 120. Battery cell; 121. Housing; 122. End cap; 1221. Groove; 1222. Connecting part; 123. Electrode assembly;

[0041] 130. Conductive component; 131. First through hole; 132. First solder mark; 133. First clearance groove;

[0042] 140. Insulating component; 141. Bottom wall; 142. Side wall; 143. Second clearance groove; 144. Second through hole. Detailed Implementation

[0043] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0045] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0046] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0047] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0048] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0049] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0050] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0051] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.

[0052] In the development of battery technology, how to improve the reliability of battery devices is a technical problem that urgently needs to be solved.

[0053] Based on the above considerations, in order to improve the reliability of the battery device, a battery cell is designed, which includes: a shell having a receiving cavity and a first wall; an electrode assembly disposed within the receiving cavity; an electrode terminal disposed on the first wall and electrically connected to the electrode assembly, the electrode terminal including a conductive element disposed on the side of the first wall away from the electrode assembly and connected to a busbar component through a first solder mark; and an insulating element at least partially disposed between the conductive element and the first wall; wherein the conductive element has a first surface facing the insulating element, the insulating element has a second surface facing the conductive element, and the first surface and / or the second surface are provided with clearance grooves; the orthographic projection of the first solder mark on the first surface or the second surface at least partially falls within the clearance groove range.

[0054] In the technical solution of this application embodiment, since the first surface and the second surface are provided with relief grooves, the orthographic projection of the first solder mark on the first surface or the second surface falls at least partially within the relief groove range. In this way, when the conductive component is welded to the busbar component, the heat generated at the first solder mark will not be transferred to the insulating component under the limitation of the relief groove, thereby avoiding the insulating component from being burned. This can ensure the sealing effect between the conductive component and the first wall and improve the reliability of the battery cell.

[0055] In this application, "battery" refers to a single physical module comprising one or more individual battery cells to provide higher voltage and capacity. For example, the battery mentioned in this application may include a battery pack, etc. Batteries can serve as a power source or power system for electrical devices, which helps improve the overall performance of the battery and facilitates its widespread adoption.

[0056] The aforementioned electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0057] For ease of explanation, the following embodiments will be described using a vehicle 1000 as an example of an electrical device according to an embodiment of this application.

[0058] Please refer to Figure 1 , Figure 1This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery 100 is disposed inside the vehicle 1000, and the battery 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery 100 can be used to power the vehicle 1000; for example, the battery 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during startup, navigation, and driving.

[0059] In some embodiments of this application, the battery 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0060] Please refer to Figure 2 , Figure 2 This is an exploded view of a battery 100 provided in some embodiments of this application. The battery 100 includes a housing 110 and a battery cell 120, with the battery cell 120 housed within the housing 110. The housing 110 provides a accommodating space for the battery cell 120, and the housing 110 can adopt various structures. In some embodiments, the housing 110 may include a first portion 111 and a second portion 112, which overlap each other, and together define a accommodating space for accommodating the battery cell 120. The second portion 112 may be a hollow structure with one open end, and the first portion 111 may be a plate-like structure, with the first portion 111 covering the open side of the second portion 112 so that the first portion 111 and the second portion 112 together define the accommodating space; alternatively, the first portion 111 and the second portion 112 may both be hollow structures with one open side, with the open side of the first portion 111 covering the open side of the second portion 112. Of course, the box 110 formed by the first part 111 and the second part 112 can be of various shapes, such as a cylinder, a cuboid, etc.

[0061] In battery 100, there can be multiple battery cells 120. These multiple battery cells 120 can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 120 are connected in both series and parallel. Multiple battery cells 120 can be directly connected in series, parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 120 is housed within housing 110. Alternatively, battery 100 can also consist of multiple battery cells 120 first connected in series, parallel, or in a mixed configuration to form a battery module, and then multiple battery modules are connected in series, parallel, or in a mixed configuration to form a whole, which is also housed within housing 110. Battery 100 may also include other structures; for example, battery 100 may also include a busbar component for electrical connection between multiple battery cells 120.

[0062] Each battery cell 120 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 120 can be cylindrical, flat, cuboid, or other shapes.

[0063] like Figure 3 As shown, the battery cell 120 may include a housing, an electrode assembly 123, and electrode terminals. The housing includes a casing 121 and an end cap 122. The casing 121 has an opening, and the end cap 122 closes the opening to isolate the internal environment of the battery cell 120 from the external environment.

[0064] The housing 121 is an assembly used to cooperate with the end cap 122 to form the internal environment of the battery cell 120, wherein the formed internal environment can accommodate the electrode assembly 123, electrolyte, and other components. The housing 121 and the end cap 122 can be independent components. The housing 121 can have various shapes and sizes. Specifically, the shape of the housing 121 can be determined according to the specific shape and size of the electrode assembly 123. The housing 121 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, and plastic.

[0065] End cap 122 refers to a component that covers the opening of housing 121 to isolate the internal environment of battery cell 120 from the external environment. The shape of end cap 122 can be adapted to the shape of housing 121 to fit it. Optionally, end cap 122 can be made of a material with certain hardness and strength (such as aluminum alloy), so that end cap 122 is not easily deformed under pressure and impact, giving battery cell 120 higher structural strength and improved reliability. Functional components such as electrode terminals can be provided on end cap 122. Electrode terminals can be used for electrical connection with electrode assembly 123 to output or input electrical energy to battery cell 120. The material of end cap 122 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose special limitations on this. In some embodiments, an insulating structure may be provided on the inner side of the end cap 122. The insulating structure can be used to isolate the electrical connection components within the housing 121 from the end cap 122 to reduce the risk of short circuits. For example, the insulating structure may be made of plastic, rubber, etc.

[0066] Electrode assembly 123 is the component in the battery cell 120 where electrochemical reactions occur. The housing 121 may contain one or more electrode assemblies 123. The electrode assembly 123 is mainly formed by winding or stacking positive and negative electrode sheets, and typically a separator is provided between the positive and negative electrode sheets to separate them and prevent internal short circuits. The portions of the positive and negative electrode sheets containing active material constitute the main body of the electrode assembly 123, while the portions without active material each constitute a tab. The positive and negative tabs may be located together at one end of the main body or at opposite ends. During the charging and discharging process of the battery 100, the positive and negative active materials react with the electrolyte, and the tabs connect to the electrode terminals to form a current loop. Furthermore, the electrode assembly 123 can be a wound structure or a stacked structure.

[0067] In some embodiments, the battery cell 120 may also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of the battery cell 120 reaches a threshold.

[0068] According to some embodiments of this application, Figure 4 This is a schematic diagram of the structure of a single battery cell in this application. Figure 5 This is a schematic diagram of the end cap in this application. Figure 6 for Figure 5 Enlarged diagram of point A in the diagram. Figure 7 This is a schematic diagram of the insulating component in this application. Figure 8 This is a schematic diagram of the conductive components in this application. Figure 9 for Figure 8 A diagram from another perspective. (See example.) Figures 4-9 As shown, this application provides a battery cell, which includes a housing, an electrode assembly 123, electrode terminals, and an insulator 140. The housing has a receiving cavity and a first wall, and the electrode assembly 123 is disposed within the receiving cavity. The electrode terminals are disposed on the first wall and electrically connected to the electrode assembly 123. The electrode terminals include a conductive element 130, which is disposed on the side of the first wall away from the electrode assembly and connected to a busbar component via a first solder mark 132. The insulator 140 is at least partially disposed between the conductive element 130 and the first wall. The conductive element 130 has a first surface facing the insulator 140, and the insulator 140 has a second surface facing the conductive element 130. The first surface and / or the second surface are provided with clearance grooves. The orthographic projection of the first solder mark 132 on the first surface or the second surface at least partially falls within the clearance groove.

[0069] In this embodiment, the outer shell can refer to the structure of the shell 121 described above, and the first wall can refer to the structure of the end cap 122 described above. The specific details can be determined according to the actual situation, and this specification does not limit this embodiment.

[0070] In this embodiment, the conductive component 130 can be a terminal post, and the insulating component 140 can be the top plastic layer in the battery cell. This top plastic layer mainly serves to protect the internal components of the battery and provide structural support. The top plastic layer not only prevents electrolyte leakage from inside the battery but also prevents external substances from entering the battery, ensuring the safety and stability of the battery.

[0071] When the first wall is an end cap 122 structure, the insulating element 140 is disposed between the conductive element 130 and the end cap 122.

[0072] In this embodiment, a clearance groove may be provided on the first surface, or on the second surface, or on both the first and second surfaces. For ease of explanation, the following description will use the example of providing clearance grooves on both the first and second surfaces simultaneously.

[0073] In this embodiment, when the conductive component 130, the insulating component 140, and the end cap 122 are connected together in sequence along the X-axis direction, the conductive component 130, the insulating component 140, and the end cap 122 form a sealed structure.

[0074] In this embodiment, the projection of the first weld mark 132 formed by welding the conductive component 130 and the busbar component in the X-axis direction can partially fall within the clearance groove range or completely fall within the clearance groove range. The specific location can be determined according to the actual situation, and this embodiment does not limit this.

[0075] In the technical solution of this application embodiment, since the first surface and the second surface are provided with relief grooves, the orthographic projection of the first solder mark 132 on the first surface or the second surface at least partially falls within the relief groove range. In this way, when the conductive component 130 is welded to the busbar component, the heat generated at the first solder mark 132 will not be transferred to the insulating component 140 under the limitation of the relief groove, thereby avoiding the insulating component 140 from being burned, and thus ensuring the sealing effect between the conductive component 130 and the first wall, improving the reliability of the battery cell 120.

[0076] According to some embodiments of this application, such as Figure 9 and combined Figure 8 As shown, a first clearance groove 133 is provided on the first surface, and the orthographic projection of the first solder mark 132 on the first surface falls entirely into the first clearance groove 133.

[0077] In this embodiment, the first projection of the first solder mark 132 in the X-axis direction falls entirely within the first clearance groove 133. This ensures that the size of the first clearance groove 133 is larger than the size of the first solder mark 132, and the first projection of the first solder mark 132 in the X-axis direction is located in the hollow portion inside the first clearance groove 133. Therefore, the heat generated by the first solder mark 132 cannot be transferred to the edge of the first clearance groove 133.

[0078] According to some embodiments of this application, the depth of the first clearance groove 133 along the first direction is D1, and the dimension of the conductive member 130 along the first direction is D2, wherein 0 < D1 / D2 ≤ 0.5, and the first direction is the direction from the side of the conductive member 130 away from the insulating member 140 to the first surface.

[0079] The first direction in this embodiment is as follows: Figure 6 The X-axis direction in the diagram.

[0080] In this embodiment, D1 can be between 6mm and 12mm, and D2 can be between 15mm and 25mm. The specific values ​​can be determined according to the actual situation, and this embodiment does not limit them.

[0081] This application embodiment ensures that the conductive component 130 has a certain thickness at the first solder mark 132 by defining the relationship between D1 and D2, thereby preventing the conductive component 130 from being soldered through when it is soldered to the busbar component due to its thinness.

[0082] According to some embodiments of this application, such as Figure 7 As shown, a second clearance groove 143 is provided on the second surface, and the orthographic projection of the first solder mark 132 on the second surface falls entirely into the second clearance groove 143.

[0083] In this embodiment, the first projection of the first solder mark 132 in the X-axis direction falls entirely into the second clearance groove 143. As a result, the first projection of the first solder mark 132 in the X-axis direction is completely located in the hollow part inside the second clearance groove 143, so the heat generated by the first solder mark 132 cannot be transferred to the edge of the second clearance groove 143.

[0084] According to some embodiments of this application, the depth of the second clearance groove 143 along the first direction is D3, and the dimension of the insulating member 140 along the first direction is D4, wherein 0 < D3 / D4 ≤ 1.

[0085] The first direction in this embodiment can be referred to the description above, and will not be repeated here.

[0086] In this embodiment, D4 can be between 2mm and 5mm, and D3 can be between 1mm and 5mm. The specific values ​​can be determined according to the actual situation, and this embodiment does not limit them.

[0087] In this embodiment, when the second clearance groove 143 passes through along the X-axis, the interior of the second clearance groove 143 is a hollow structure, which effectively prevents the second clearance groove 143 from receiving the heat generated by the first solder mark 132.

[0088] According to some embodiments of this application, such as Figure 6 As shown, a groove 1221 is provided on the side of the first wall facing the conductive member 130, and the insulating member 140 is located in the groove 1221.

[0089] In this embodiment, the first wall is the end cap 122, and the end cap 122 is provided with a groove 1221, and the insulating component 140 is fixed in the groove 1221.

[0090] In this embodiment, when the insulating member 140 is located within the groove 1221, the insulating member 140 and the groove 1221 are in close contact. By providing the groove 1221 on the first wall, the insulating member 140 can be easily fixed to the first wall.

[0091] According to some embodiments of this application, such as Figure 7 As shown, the insulating member 140 includes a bottom wall 141 and a side wall 142 disposed around the bottom wall 141. The side wall 142 and the bottom wall 141 form a concave structure, and the conductive member 130 is located in the concave structure. Meanwhile, a second clearance groove 143 on the second surface is disposed on the bottom wall 141. Along the second direction, the side wall 142 abuts against the inner wall of the groove 1221. The second direction is perpendicular to the first direction.

[0092] The first direction in this embodiment is as follows: Figure 6 The X-axis direction is perpendicular to the first direction, and the second direction is perpendicular to the side wall 142.

[0093] In this embodiment, when the insulating member 140 is located in the groove 1221, the bottom wall 141 is in close contact with the bottom surface of the groove 1221, and the side wall 142 abuts against the inner side surface of the groove 1221.

[0094] In this embodiment, since the side wall 142 and the bottom wall 141 are arranged in a concave structure, it is convenient to fix the conductive element 130 in the insulating element 140.

[0095] According to some embodiments of this application, the surface on which the conductive element 130 is connected to the busbar is a third surface, and the sidewall 142 does not extend beyond the third surface along the first direction.

[0096] The first direction in this embodiment can be referred to the description above, and will not be repeated here.

[0097] refer to Figure 6 and combined Figure 7 As shown, when the conductive component 130 is located in the groove 1221, the side wall 142 will not block the upper surface of the conductive component 130, thus avoiding affecting the welding quality of the conductive component 130 and the bus component.

[0098] According to some embodiments of this application, such as Figure 5 and combined Figure 6 As shown, the electrode terminal also includes a connecting portion 1222, a first through hole 131 is provided on the conductive member 130, and a second through hole 144 is provided on the insulating member 140; one end of the connecting portion 1222 is electrically connected to the electrode assembly 123, and the other end of the connecting portion 1222 passes through the second through hole 144 and the first through hole 131 in sequence along the first direction and is then electrically connected to the conductive member 130.

[0099] In this embodiment, after the connecting part 1222 passes through the second through hole 144 and the first through hole 131, it can be electrically connected to the busbar component through the conductive element 130.

[0100] According to some embodiments of this application, the battery cell also includes a seal (not shown in the figure), which is at least partially located between the first wall and the connection portion 1222.

[0101] The sealing element in this embodiment can be a sealing ring, a rubber ring, etc., and the specific one can be determined according to the actual situation. This specification does not limit this embodiment.

[0102] refer to Figure 6 As shown, in this embodiment, a sealing element is provided between the end cap 122 and the connecting part 1222, thereby improving the sealing performance between the end cap 122 and the connecting part 1222.

[0103] This application also provides a battery device, including a battery cell and a current-combining component as described in any of the embodiments of this application, wherein the current-combining component is connected to a conductive element via a first solder mark.

[0104] The battery cell in this embodiment includes a casing, an electrode assembly 123, electrode terminals, and an insulator 140. The casing has a receiving cavity and a first wall, and the electrode assembly 123 is disposed within the receiving cavity. The electrode terminals are disposed on the first wall and electrically connected to the electrode assembly 123. The electrode terminals include a conductive element 130, which is disposed on the side of the first wall away from the electrode assembly and connected to a busbar component via a first solder mark 132. The insulator 140 is at least partially disposed between the conductive element 130 and the first wall. The conductive element 130 has a first surface facing the insulator 140, and the insulator 140 has a second surface facing the conductive element 130. The first surface and / or the second surface are provided with clearance grooves. The orthographic projection of the first solder mark 132 on the first surface or the second surface at least partially falls within the clearance groove.

[0105] Since the battery device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be repeated here.

[0106] This application also provides an electrical device, including a battery device as described in the embodiments of this application.

[0107] The specific structure of the battery device in this embodiment refers to the above embodiments. Since the power device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0108] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, include: An outer casing having a receiving cavity, the outer casing having a first wall; The electrode assembly is disposed within the receiving cavity; An electrode terminal is disposed on the first wall and electrically connected to the electrode assembly. The electrode terminal includes a conductive element disposed on the side of the first wall opposite to the electrode assembly and connected to the busbar component through a first solder mark. An insulating element is at least partially disposed between the conductive element and the first wall; The conductive element has a first surface facing the insulating element, the insulating element has a second surface facing the conductive element, and the first surface and / or the second surface are provided with clearance grooves. The orthographic projection of the first solder mark on the first surface or the second surface at least partially falls within the range of the clearance groove.

2. The battery cell according to claim 1, characterized in that, A first clearance groove is provided on the first surface, and the orthographic projection of the first solder mark on the first surface falls entirely into the first clearance groove.

3. The battery cell according to claim 2, characterized in that, The depth of the first clearance groove along the first direction is D1, and the dimension of the conductive element along the first direction is D2, wherein 0 < D1 / D2 ≤ 0.5, and the first direction is the direction from the side of the conductive element away from the insulating element to the first surface.

4. The battery cell according to claim 1, characterized in that, A second clearance groove is provided on the second surface, and the orthographic projection of the first solder mark on the second surface falls entirely into the second clearance groove.

5. The battery cell according to claim 4, characterized in that, The depth of the second clearance groove along the first direction is D3, and the dimension of the insulating member along the first direction is D4, wherein 0 < D3 / D4 ≤ 1.

6. The battery cell according to any one of claims 1 to 5, characterized in that, The first wall has a groove on the side facing the conductive element, and the insulating element is located in the groove.

7. The battery cell according to claim 6, characterized in that, The insulating element includes a bottom wall and side walls disposed around the bottom wall, the side walls and the bottom wall forming a concave structure, and the conductive element is located within the concave structure; A second clearance groove is provided on the second surface of the bottom wall, and the side wall abuts against the inner wall of the groove along the second direction, which is perpendicular to the first direction.

8. The battery cell according to claim 7, characterized in that, The surface on which the conductive element connects to the busbar is a third surface, and along the first direction, the sidewall does not extend beyond the third surface.

9. The battery cell according to claim 1, characterized in that, The electrode terminal further includes a connecting portion, the conductive component is provided with a first through hole, and the insulating component is provided with a second through hole; One end of the connecting part is electrically connected to the electrode assembly, and the other end of the connecting part passes through the second through hole and the first through hole in sequence along the first direction and is then electrically connected to the conductive element.

10. The battery cell according to claim 9, characterized in that, The battery cell also includes a seal, which is at least partially located between the first wall and the connecting portion.

11. A battery device, characterized in that, It includes a battery cell and a current collector as described in any one of claims 1 to 10, wherein the current collector is connected to the conductive element via the first solder mark.

12. An electrical appliance, characterized in that, Includes the battery device as described in claim 11.

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