Battery cell, battery, and electric device

Abstract

The application relates to the field of batteries, and discloses a battery monomer, a battery and a power utilization device. The battery monomer comprises a shell, a first wall of the shell is provided with an electrode lead-out hole; an electrode assembly is arranged in the shell, and the electrode assembly is provided with an electrode connecting piece; an electrode terminal comprises a body and a pole, the pole is protruded on one side of the body, the pole is arranged in the electrode lead-out hole, the body is arranged in the shell and is electrically connected with the electrode connecting piece; the body has a first side surface and a second side surface which are oppositely arranged along a first direction, and the distance between the first side surface and the pole is greater than the distance between the second side surface and the pole. The battery monomer provided by the application can optimize the arrangement space of elements in the battery monomer.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery cell, a battery, 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] Power batteries generally consist of individual battery cells. The compact arrangement of components within a battery cell restricts the layout of its components. Summary of the Invention

[0004] In view of this, embodiments of this application provide a battery cell, a battery, and an electrical device that can optimize the arrangement space of components in the battery cell.

[0005] An embodiment of the first aspect of this application provides a battery cell, comprising:

[0006] The outer casing has electrode lead-out holes on its first wall;

[0007] An electrode assembly is disposed within the housing, and the electrode assembly is provided with electrode connectors;

[0008] An electrode terminal includes a body and a post protruding from one side of the body. The post passes through the electrode lead-out hole. The body is disposed inside the housing and is electrically connected to the electrode connector.

[0009] The body has a first side and a second side disposed opposite to each other along the first direction, and the distance between the first side and the pole post is greater than the distance between the second side and the pole post.

[0010] The battery cell provided in this application includes a casing, an electrode assembly, and electrode terminals. The first wall of the casing has an electrode lead-out hole, and the electrode assembly has an electrode connector. Because the body of the electrode terminal is offset relative to the centerline of the electrode lead-out hole and the terminal post, one end of the body can be used to connect to the electrode connector, while the other end can provide some clearance space for the components within the battery cell, thereby optimizing the arrangement space of the components in the battery cell. Simultaneously, because the electrode terminal has an eccentric structure, it possesses high torsional strength.

[0011] In some embodiments, the body includes a pole post connecting portion and a first extension portion, the pole post connecting portion being disposed corresponding to the pole post along the thickness direction of the first wall, and the first extension portion extending from the pole post connecting portion along a first direction, the first direction being the length direction of the first wall;

[0012] A first solder mark is formed between the body and the electrode connector, and the first solder mark is at least partially located in the first extension.

[0013] By adopting the above technical solution, the body is offset relative to the electrode post, and the first solder mark between the body and the electrode connector is at least partially located in the first extension. The first extension can serve as the welding area between the electrode terminal and the electrode connector. Based on optimizing the component layout space, the electrode terminal can meet the welding requirements.

[0014] In some embodiments, the body has a third side and a fourth side disposed opposite to each other along a second direction, the second direction being the width direction of the first wall;

[0015] The distance between the third side and the pole post is greater than the distance between the fourth side and the pole post.

[0016] By adopting the above technical solution, the body is offset relative to the electrode post along the length direction of the first wall. At the same time, the body is also offset relative to the electrode post along the width direction of the first wall, which facilitates the welding of the tab to the electrode terminal, reduces the redundancy of the tab, and thus reduces the space occupied by the tab, which is beneficial to improving the energy density of the battery.

[0017] In some embodiments, two electrode lead-out holes, two electrode connectors, and two electrode terminals are provided, and the electrode connector includes a tab;

[0018] The center distance between the two electrodes is less than the center distance between the two pole posts.

[0019] By adopting the above technical solution, when the center distance between pole posts is small, the center distance between pole tabs is smaller than the center distance between pole tabs. At the same time, the offset setting of the body can improve the misalignment space of the pole tabs.

[0020] The electrode connector includes an electrode tab and an adapter plate, and the adapter plate is welded to the electrode tab and the body respectively;

[0021] The first extension extends toward a direction away from the centerline of the housing, and the first solder mark is formed between the first extension and the adapter piece.

[0022] By adopting the above technical solution, the first extension provides a larger welding area for welding between the electrode terminal and the electrode connector, which is beneficial to improving the welding quality.

[0023] In some embodiments, a second solder mark is formed between the electrode tab and the adapter piece, the second solder mark being located on the side of the first solder mark near the middle of the first wall.

[0024] By adopting the above technical solution, the laser welding area and the ultrasonic welding area are staggered by the adapter plate, which is beneficial to the arrangement of the electrodes and makes the misalignment space of the electrodes more sufficient.

[0025] In some embodiments, the first extension includes a first segment having a first thickness and a second segment having a second thickness, the first segment being disposed between the pole post connection and the second segment, and the first solder mark being located on the second segment; the second thickness is greater than or equal to the first thickness.

[0026] By adopting the above technical solution, the second section can meet the requirements of laser welding penetration depth.

[0027] In some embodiments, the ratio of the second thickness to the first thickness is greater than or equal to and less than or equal to.

[0028] By adopting the above technical solution, the battery cell can take into account both the space and the structural strength below the sealing ring, resulting in better sealing performance of the battery cell.

[0029] In some embodiments, the adapter plate has a third thickness, wherein the ratio of the second thickness to the third thickness is greater than or equal to and less than or equal to 3.

[0030] By adopting the above technical solution, the electrode terminals can meet the requirements of melting depth without taking up too much space in the battery cell.

[0031] In some embodiments, the adapter plate is stepped, and its two ends are connected to the first segment and the second segment, respectively.

[0032] By adopting the above technical solution, the shape of the adapter piece is adapted to the shape of the electrode terminal to meet the welding requirements.

[0033] In some embodiments, the first extension extends toward the centerline of the housing; the electrode connector is a tab, which is welded to at least the first extension.

[0034] By adopting the above technical solution, the body leaves a clearance space on the side near the edge of the outer shell, reducing the space occupied by the electrode terminals in the edge area of ​​the battery cell. The space between the body and the edge of the outer shell can be used to arrange other components, such as pressure strips, which can also optimize the arrangement space of components in the battery cell.

[0035] In some embodiments, the electrode tab includes a plurality of electrode tab portions, which are welded together to form a second solder mark, the projection of the second solder mark toward the electrode terminal falling entirely within the body.

[0036] By adopting the above technical solution, the electrode tab can be set to correspond with the body to facilitate welding, and the laser welding head can be prevented from pressing directly on the electrode tab during laser welding, thus crushing or cracking the electrode tab.

[0037] In some embodiments, along the length of the first wall, the second solder mark is offset inward relative to the body, and there is a first distance between the inner edge of the second solder mark and the inner edge of the body.

[0038] Along the width direction of the first wall, the second solder mark is offset downward relative to the body, and there is a second distance between the lower edge of the second solder mark and the lower edge of the body;

[0039] At least one of the first distance and the second distance is greater than or equal to 1 mm.

[0040] By adopting the above technical solution, the second solder mark can be made to fall completely within the range of the electrode terminal.

[0041] In some embodiments, the projection of the second solder mark on the body falls within the first solder mark;

[0042] Along the width direction of the first wall, there is a third distance between the edge of the first solder mark and the edge of the second solder mark;

[0043] Along the length of the first wall, there is a fourth distance between the edge of the first solder mark and the edge of the second solder mark;

[0044] Both the third distance and the fourth distance are greater than 0 and less than twice the width of the first solder mark.

[0045] By adopting the above technical solution, the projection of the second solder mark on the electrode terminal falls within the projection of the first solder mark on the electrode terminal, which can improve the welding reliability between the electrode tab and the body.

[0046] In some embodiments, the ratio of the thickness of the body to the thickness of the tab is greater than or equal to 3.

[0047] By adopting the above technical solution, the thickness of the body can be greater than the laser welding penetration depth, making it less likely to weld through the body during welding.

[0048] In some embodiments, the penetration depth of the first solder mark on the body is less than or equal to the thickness of the body.

[0049] By adopting the above technical solution, it is possible to prevent laser welding from easily penetrating the substrate.

[0050] In some embodiments, the penetration depth of the first solder mark on the body is less than or equal to half the thickness of the body.

[0051] By adopting the above technical solution, the impact of welding heat on the compression of the sealing ring can be reduced.

[0052] In some embodiments, the first wall of the housing is further provided with a liquid injection hole and an explosion-proof valve mounting hole, and the first wall is provided with a liquid injection hole baffle to seal the liquid injection hole and an explosion-proof valve passing through the explosion-proof valve mounting hole, wherein the liquid injection hole and the explosion-proof valve are spaced apart.

[0053] The electrode terminals have a first height on the inner surface of the first wall;

[0054] The injection hole baffle has a second height on the inner surface of the first wall;

[0055] The first height may be equal to or different from the second height.

[0056] By adopting the above technical solution, the adapter piece is eliminated, which solves the problem in the prior art that the adapter piece needs to avoid the liquid injection hole baffle. The height of the liquid injection hole baffle and the main body can be flexibly set.

[0057] In some embodiments, the second height is smaller than the first height.

[0058] By adopting the above technical solution, when the electrode tab is welded to the body, the liquid injection hole baffle is less likely to interfere with the electrode tab.

[0059] In some embodiments, the explosion-proof valve has a third height on the inner surface of the first wall;

[0060] Wherein, the second height is greater than the first height, and the sum of the second height, the thickness of the tab, and the thickness of the adhesive paper attached to the tab is less than the third height.

[0061] By adopting the above technical solution, the probability of the tab being lifted up by the liquid injection hole baffle and inserted into the electrode sheet can be reduced.

[0062] In some embodiments, the first direction is the width direction of the first wall.

[0063] By adopting the above technical solution, the main body is offset relative to the electrode post in the width direction of the first wall. One end of the main body can provide a certain clearance space for the components in the battery cell, thus optimizing the arrangement space of the components in the battery cell. In addition, the main body can be offset towards the side where the electrode connector is located, which facilitates the welding of the electrode connector to the main body, reduces the redundancy and space occupied by the electrode connector, and helps to improve the energy density of the battery cell.

[0064] In some embodiments, the electrode connector includes a tab, the tab having a misalignment space within the battery cell, the misalignment space having a length greater than or equal to 8 mm.

[0065] An embodiment of the second aspect of this application provides a battery comprising a battery cell as provided in the first aspect.

[0066] An embodiment of the third aspect of this application provides an electrical device including a battery as provided in the second aspect.

[0067] 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

[0068] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0069] Figure 1 These are schematic diagrams of the vehicle structure provided in some embodiments of this application;

[0070] Figure 2 These are schematic diagrams of the battery structure provided in some embodiments of this application;

[0071] Figure 3 These are schematic diagrams of the structure of a single battery cell provided in some embodiments of this application;

[0072] Figure 4 yes Figure 3 A bottom view of the first wall of the battery cell shown;

[0073] Figure 5 yes Figure 4 The first wall shown is a cross-sectional view along line AA.

[0074] Figure 6 yes Figure 5 A partial schematic diagram of the first wall shown;

[0075] Figure 7 yes Figure 3 A top view of the battery cell shown;

[0076] Figure 8 yes Figure 7 The cross-sectional view of the battery cell shown along line BB;

[0077] Figure 9 yes Figure 8 A magnified view of part C in the shown battery cell;

[0078] Figure 10 These are schematic diagrams of the structure of a battery cell provided in other embodiments of this application;

[0079] Figure 11 yes Figure 10 A top view of the battery cell shown;

[0080] Figure 12 yes Figure 11 The image shows a cross-sectional view of a single battery cell along the DD line.

[0081] Figure 13 yes Figure 10 A bottom view of the first wall of the battery cell shown;

[0082] Figure 14 yes Figure 13 A schematic diagram of a partial structure of the first wall shown;

[0083] Figure 15 yes Figure 13 The first wall shown is a cross-sectional view along line EE.

[0084] Figure 16 yes Figure 15 A partial schematic diagram of the sectional view shown.

[0085] The markings in the diagram mean:

[0086] 1000, Vehicle; 100, Battery; 200, Controller; 300, Motor; 10, Housing; 11, First Part; 12, Second Part; 20, Battery Cell; 21, Shell; 211, First Wall; 212, Electrode Lead-out Hole; 213, Liquid Injection Hole; 214, Explosion-proof Valve Mounting Hole; 22, Electrode Assembly; 221, Electrode Connector; 2211, Tab; 2211a, Tab Misalignment Line; 2212, Adapter; 23, Electrode Terminal; 231, Body; 231a, First Side; 231b, Second Side; 2311, Terminal Connection; 2312, First Extension; 2312a, First Section; 2312b, Second Section; 2313, Second Extension; 232, Terminal; 233. Riveted parts; 24. Fluid injection hole baffle; 25. Explosion-proof valve; 31. First weld mark; 32. Second weld mark. Detailed Implementation

[0087] 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.

[0088] 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.

[0089] 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.

[0090] 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.

[0091] 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.

[0092] 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).

[0093] In the description of the embodiments of this application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not 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.

[0094] 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.

[0095] A power battery generally includes a battery cell, which includes an electrode assembly, a housing that houses the electrode assembly, and an end cap that covers the housing. The end cap usually has two terminals and an injection hole. The terminals are connected to the tabs on the electrode assembly via adapter plates.

[0096] Research has found that the compact arrangement of space within a single battery cell restricts the arrangement of components within that cell.

[0097] To address the aforementioned issues, a battery cell was designed after in-depth research. The cell includes a casing, an electrode assembly, and two electrode terminals. The first wall of the casing has an electrode lead-out hole. The electrode assembly is located within the casing and has an electrode connector. A terminal post is located on the first wall of the casing. Each electrode terminal includes a body and a terminal post protruding from one side of the body. The terminal post passes through the electrode lead-out hole. The body is located within the casing and is electrically connected to the electrode connector. The body has a first side and a second side arranged opposite each other along a first direction. The distance between the first side and the terminal post is greater than the distance between the second side and the terminal post. Because the body of the electrode terminal is offset relative to the electrode lead-out hole and the terminal post, one end of the body can be used to connect to the electrode connector, while the other end provides a certain amount of clearance space, thus optimizing the arrangement space of components within the battery cell.

[0098] The battery cell provided in this application embodiment can be used in electrical devices that use batteries as a power source. These 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.

[0099] 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.

[0100] 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.

[0101] 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.

[0102] Please refer to Figure 2 , Figure 2 This is an exploded view of a battery 100 provided for some embodiments of this application. In some embodiments, the battery 100 includes a housing 10 and battery cells 20, with the battery cells 20 housed within the housing 10.

[0103] The housing 10 provides a space for housing individual battery cells, and the housing 10 can adopt various structures. In some embodiments, the housing 10 may include a first portion 11 and a second portion 12, which overlap each other, and together define a space for housing individual battery cells. The second portion 12 may be a hollow structure with one open end, and the first portion 11 may be a plate-like structure, with the first portion 11 covering the open side of the second portion 12 so that the first portion 11 and the second portion 12 together define the space; alternatively, the first portion 11 and the second portion 12 may both be hollow structures with one open side, with the open side of the first portion 11 covering the open side of the second portion 12. Of course, the housing 10 formed by the first portion 11 and the second portion 12 can be of various shapes, such as a cylinder, a cuboid, etc.

[0104] In battery 100, there can be multiple battery cells 20, which can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 20 are connected in both series and parallel configurations. Multiple battery cells 20 can be directly connected in series, parallel, or in a mixed manner, and then the entire assembly of the multiple battery cells 20 is housed within the housing 10. Alternatively, battery 100 can also be composed of multiple battery cells 20 first connected in series, parallel, or in a mixed manner to form a battery module, and then multiple battery modules are connected in series, parallel, or in a mixed manner to form a whole, which is also housed within the housing 10. Battery 100 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 20.

[0105] Each battery cell 20 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 20 can be cylindrical, flat, cuboid, or other shapes.

[0106] An embodiment of the first aspect of this application provides a battery cell 20. Please refer to... Figures 3 to 6 The battery cell 20 includes a housing 21, an electrode assembly 22, and an electrode terminal 23. The first wall 211 of the housing 21 is provided with an electrode lead-out hole 212. The electrode assembly 22 is disposed inside the housing 21 and is provided with an electrode connector 221. The electrode post 232 is disposed on the first wall 211 of the housing 21. The electrode terminal 23 includes a body 231 and an electrode post 232 protruding from one side of the body 231. The electrode post 232 passes through the electrode lead-out hole 212. The body 231 is disposed inside the housing 21 and is electrically connected to the electrode connector 221. The body 231 has a first side surface 231a and a second side surface 231b arranged opposite to each other along a first direction. The distance between the first side surface 231a and the electrode post 232 is greater than the distance between the second side surface 231b and the electrode post 232.

[0107] The outer casing 21 is a component used to form the internal environment of the battery cell 20. The internal environment formed by the outer casing 21 can accommodate the electrode assembly 22, electrolyte, and other components. The outer casing 21 may include a shell open at one end and an end cap covering the shell, or it may be a one-piece molded structure. The outer casing 21 can be of various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the outer casing 21 can be determined according to the specific shape and size of the electrode assembly 22. The outer casing 21 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. The first wall 211 of the outer casing 21 is provided with an electrode lead-out hole 212. The first wall 211 with the electrode lead-out hole 212 can be located on the side, top, or bottom of the outer casing 21. The electrode lead-out hole 212 is used to install the electrode post 232. The electrode lead-out hole 212 can be a circular through hole or a through hole of other shapes.

[0108] Electrode assembly 22 is the component in the battery cell 20 where the electrochemical reaction takes place. The casing 21 may contain one or more electrode assemblies 22. The electrode assembly 22 is mainly formed by winding or stacking positive and negative electrode plates, and typically a separator is provided between the positive and negative electrode plates. The portions of the positive and negative electrode plates containing active material constitute the main body of the electrode assembly 22, while the portions of the positive and negative electrode plates without active material each constitute tabs 2211.

[0109] The electrode connector 221 in this embodiment includes at least a tab 2211. In some embodiments, the electrode connector 221 may also include other components electrically connected between the tab 2211 and the electrode terminal 23. For example, the electrode connector 221 includes a tab 2211 and an adapter piece 2212, which is welded to both the tab 2211 and the electrode terminal 23. During the charging and discharging process of the battery, the positive and negative active materials react with the electrolyte, and the electrode connector 221 connects the electrode terminal 23 to form a current loop.

[0110] The electrode terminal 23 includes a body 231 and a terminal post 232 protruding from one side of the body 231. The terminal post 232 can be integrally formed with the body 231, or it can be separately formed and fixedly connected to the body 231. The terminal post 232 passes through the electrode lead-out hole 212 and is used for electrical connection with external electrical components. The body 231 is located inside the housing 21 and is welded to the electrode connector 221. The body 231 is used for electrical connection with the electrode connector 221. Optionally, the terminal post 232 may be, but is not limited to, cylindrical, and the body 231 may be, but is not limited to, flat, for example, the body 231 may be rectangular flat. The electrode terminal 23 may also include a riveting member 233 located on the outside of the housing 21, which is connected to the terminal post 232.

[0111] In this embodiment, the electrode terminal 23 can be either a negative electrode terminal or a positive electrode terminal. Along the first direction, the center line from the opposite ends of the body 231 to the electrode lead-out hole 212 ( Figure 6The distances between the first side surface 231 and the electrode lead-out hole 212 are unequal. The first direction can be the length direction (X direction) or the width direction (Y direction) of the first wall 211, or other directions that form an angle with both the length and width directions of the first wall 211. The body 231 has a first side surface 231a and a second side surface 231b arranged opposite to each other along the first direction. The distances from the first side surface 231a and the second side surface 231b to the center line of the electrode lead-out hole 212 are unequal, and the distance between the first side surface 231a and the electrode post 232 is greater than the distance between the second side surface 231b and the electrode post 232. The distance between the first side surface 231a and the electrode post 232 refers to the minimum distance between the first side surface 231a and the electrode post 232; the distance between the second side surface 231b and the electrode post 232 refers to the minimum distance between the second side surface 231b and the electrode post 232. The first side surface 231a and the second side surface 231b can be regular planes or irregular surfaces. When the pole post 232 is cylindrical, the minimum distance between the first side surface 231a and the pole post 232 is the minimum distance between the first side surface 231a and the cylindrical outer surface of the pole post 231. The minimum distance between the second side surface 231b and the pole post 232 refers to the minimum distance between the second side surface 231b and the cylindrical outer surface of the pole post 232.

[0112] like Figure 5 and Figure 6 As shown, in some embodiments, the distance between the first side 231a of the body 231 near the edge of the first wall 211 and the electrode post 232 is greater than the distance between the second side 231b of the body 231 near the middle of the first wall 211 and the electrode post 232. That is, the body 231 is offset relative to the electrode lead-out hole 212 and the electrode post 232 towards the outer side of the outer shell 21. In this embodiment, the body 231 is generally rectangular; it can be understood that if both the body 231 and the electrode post 232 are circular, then the center of the body 231 is offset relative to the center of the electrode post 232.

[0113] In this embodiment, because the body 231 is offset from the outer side of the outer casing 21 relative to the electrode lead-out hole 212, the space occupied by the electrode terminal 23 in the middle region of the battery cell 20 is reduced, so that the electrode terminal 23 can avoid other components in the battery cell 20, such as the liquid injection hole 213. In addition, the pre-welding area of ​​the tab 2211 can be close to the middle of the outer casing 21, and the space for the tab 2211 to be staggered is larger, which is beneficial to the arrangement of the tab 2211; at the same time, the welding area between the electrode connector 221 and the body 231 can be close to the outer side of the outer casing 21, which increases the welding space between the electrode connector 221 and the body 231 and optimizes the arrangement space of the components in the battery cell 20.

[0114] In other embodiments, the body 231 is offset toward the inner side of the housing 21 relative to the electrode lead-out hole 212 and the terminal post 232, which reduces the space occupied by the electrode terminal 23 in the edge area of ​​the battery cell 20. The space between the body 231 and the edge of the housing 21 can be conveniently arranged for other components, such as pressure strips, which can also optimize the arrangement space of components in the battery cell 20.

[0115] In some other embodiments, the electrode connector 221 may also include only the tab 2211, that is, the adapter 2212 is omitted. In this case, the body 231 is offset towards the outside or inside of the housing 21, which can also provide a flexible installation space for the battery cell 20.

[0116] The battery cell 20 provided in this embodiment includes a housing 21, an electrode assembly 22, and electrode terminals 23. The first wall 211 of the housing 21 has an electrode lead-out hole 212, and the electrode assembly 22 has an electrode connector 221. Because the body 231 of the electrode terminal 23 is offset relative to the centerline of the electrode lead-out hole 212 and the terminal post 232 (i.e., the centerline of the body 231 deviates from the centerline of the electrode lead-out hole 212 and the centerline of the terminal post 232), one end of the body 231 can be used to connect to the electrode connector 221, and the other end can provide a certain amount of clearance space for the components within the battery cell 20, thereby optimizing the arrangement space of the components in the battery cell 20. Simultaneously, because the electrode terminal 23 has an eccentric structure, it possesses high torsional strength, improving the overall strength of the battery cell 20.

[0117] Please refer to Figures 3 to 6 In some embodiments, the body 231 includes an electrode connection portion 2311 and a first extension portion 2312. The projection of the electrode connection portion 2311 onto the first wall 211 coincides with that of the electrode 232. The first extension portion 2312 extends from the electrode connection portion 2311 along a first direction, which is the length direction or width direction of the first wall 211. A first solder mark 31 is formed between the body 231 and the electrode connector 221. Figure 3 As shown), the first solder mark 31 is at least partially located in the first extension 2312.

[0118] The electrode connector 2311 and the first extension 2312 are integral structures. The projections of the electrode connector 2311 and the electrode 232 onto the first wall 211 coincide, meaning that the electrode connector 2311 and the electrode 232 are correspondingly arranged in the thickness direction of the first wall 211. The distance from the edge of the first extension 2312 to the center line of the electrode lead-out hole 212 is greater than the distance from the opposite end of the main body 231 and the first extension 2312 to the center line of the electrode lead-out hole 212.

[0119] In this embodiment, the first direction is the length direction (X direction) of the first wall 211, and the first extension 2312 extends from the pole post connection 2311 toward the edge of the first wall 211, that is, the body 231 is offset relative to the pole post 232 toward the outside of the outer shell 21. In other embodiments, the first extension 2312 may also extend from the pole post connection 2311 toward the center of the first wall 211. Optionally, the body 231 further includes a second extension 2313, which is disposed on opposite sides of the pole post connection 2311, respectively. In another embodiment, the first direction may also be the width direction of the first wall 211, and the first extension 2312 extends from the pole post connection 2311 toward the edge of the first wall 211 in the width direction, that is, the body 231 is offset relative to the pole post 232 in the width direction of the first wall 211. The body 231 and the electrode connector 221 are welded together to achieve electrical connection. The welding of the body 231 and the electrode connector 221 forms a first weld mark 31 between them. Optionally, the body 231 and the electrode connector 221 are laser-welded, and the first weld mark 31 is a laser weld mark. The first weld mark 31 is at least partially located in the first extension 2312; that is, the first weld mark 31 can fall completely within the first extension 2312, or partially within the first extension 2312, and partially within the electrode post connection 2311. By adopting the above technical solution, the body 231 is offset relative to the electrode post 232, and the first weld mark 31 between the body 231 and the electrode connector 221 is at least partially located within the first extension 2312. The first extension 2312 can serve as the welding area between the electrode terminal 23 and the electrode connector 221. Based on optimizing the component layout space, the electrode terminal 23 can meet the welding area requirements.

[0120] Two electrode lead-out holes 212, two electrode connectors 221, and two electrode terminals 23 are provided. The electrode connector 221 includes a tab 2211. In some embodiments, the center distance W1 between the two tabs 2211 is less than the center distance W3 between the two pole posts 232.

[0121] Figure 5 The length W2 of the first wall 211 is also shown. It can be understood that the center distance W1 between the two tabs 2211 and the center distance W3 between the two poles 232 are both less than the length W2 of the first wall 211.

[0122] The two tabs 2211 are the negative tab and the positive tab, respectively. The center-to-center distance W1 between the two tabs 2211 is the distance between their centers. The center-to-center distance W1 between the two tabs 2211 is relatively small. Optionally, the center-to-center distance W1 between the two tabs 2211 can be less than or equal to 130mm.

[0123] by Figures 3 to 9In the embodiment shown, since the center distance of the tabs 2211 is small, the electrode connector 221 includes not only the tabs 2211 but also the adapter piece 2212. Thus, the adapter piece 2212 is welded to the tabs 2211 to form a second solder mark 32, and the adapter piece 2212 is welded to the body 231 to form a first solder mark 31. The body 231 is offset towards the outer side of the outer shell 21, and the second solder mark 32 is closer to the middle of the outer shell 21 than the first solder mark 31, so as to facilitate the arrangement of the tabs 2211 in the middle of the electrode unit 20 and provide a larger misalignment space for the tabs 2211.

[0124] By adopting the above technical solution, when the center distance of the pole post 232 is small, the center distance of the tab 2211 is smaller than the center distance of the pole post 232, and the tab 2211 has a larger arrangement space in the middle of the battery cell 20; and, due to the offset setting of the body 231, it is beneficial to obtain a sufficient welding area.

[0125] In some embodiments, the electrode connector 221 further includes an adapter piece 2212, which is welded to the tab 2211 and the body 231 respectively; the first extension 2312 extends toward the direction away from the center line of the outer shell 21, and the first solder mark 31 is formed between the first extension 2312 and the adapter piece 2212.

[0126] The first extension 2312 is offset toward the outer side of the outer casing 21, and the first solder mark 31 is formed between the first extension 2312 and the adapter piece 2212. In this way, the first extension 2312 provides a larger welding area for welding between the electrode terminal 23 and the electrode connector 221, which is beneficial to improving the welding quality.

[0127] In some embodiments, the first direction is the length direction of the first wall 211, that is, the first side and the second side are arranged opposite to each other along the length direction of the first wall 211; a second solder mark 32 is formed between the electrode tab 2211 and the adapter piece 2212, and the second solder mark 32 is located on the side of the first solder mark 31 near the middle of the first wall 211.

[0128] The tab 2211 and the adapter piece 2212 can be welded using ultrasonic welding, meaning the second weld mark 32 is an ultrasonic weld mark. The first weld mark 31 and the second weld mark 32 are spaced apart, i.e., staggered. This results in a large laser welding area between the adapter piece 2212 and the electrode terminal 23, and also a large ultrasonic welding area between the adapter piece 2212 and the tab 2211. Furthermore, the second weld mark 32 is located on the side of the first weld mark 31 closest to the center of the first wall 211, making the pre-welded area of ​​the tab 2211 closer to the center of the battery cell 20, which helps to increase the staggered arrangement space of the tab 2211. Figure 3 The misalignment line of electrode 2211 is shown. Figure 3 As can be seen, the tabs 2211 of the battery cell 20 include tabs on multiple electrode sheets. The multiple tabs can be staggered in the middle of the battery cell 20. Optionally, the multiple tabs are staggered between the first solder mark 31 and the explosion-proof valve 25.

[0129] By adopting the above technical solution, the electrode terminal 23 is offset outward, and the laser welding area and the ultrasonic welding area are staggered by the adapter piece 2212, which is beneficial to the arrangement of the tabs 2211 and makes the staggered arrangement space of the tabs 2211 more sufficient.

[0130] Please refer to Figure 6 , Figure 8 and Figure 9 In some embodiments, the first extension 2312 includes a first segment 2312a having a first thickness H1 and a second segment 2312b having a second thickness H2. The first segment 2312a is disposed between the pole post connection 2311 and the second segment 2312b, the first solder mark 31 is located in the second segment 2312b, and the second thickness H2 is greater than or equal to the first thickness H1.

[0131] When the second thickness H2 is greater than the first thickness H1, the first extension 2312 adopts a non-uniform thickness structure. Optionally, the first segment 2312a and the second segment 2312b are flush with the side of the first wall 211, making the first extension 2312 stepped, and the second segment 2312b protrudes relative to the first segment 2312a in a direction away from the first wall 211. In another embodiment, the second thickness H2 may also be equal to the first thickness H1.

[0132] The laser welding area between electrode terminal 23 and adapter piece 2212 is located at least in the second segment 2312b. By setting the thickness of the second segment 2312b to be greater than or equal to the thickness of the first segment 2312a, the second segment 2312b can meet the requirements of laser welding penetration depth.

[0133] In some embodiments, the ratio of the second thickness H2 to the first thickness H1 is greater than or equal to 1 and less than or equal to 3, i.e., 1≤H2 / H1≤3.

[0134] The outer casing 21 of the battery cell 20 may include a housing and an end cap. The first wall 211 on which the electrode terminals 23 are installed is the end cap. When assembling the battery cell 20, the end cap is placed on the housing, and a sealing ring is provided between the end cap and the housing. If the ratio of the second thickness H2 to the first thickness H1 is less than 1, it will result in insufficient laser penetration; if the ratio of the second thickness H2 to the first thickness H1 is greater than 3, it may cause the second segment 2312b to occupy too much space and the sealing effect of the sealing ring to be poor.

[0135] By adopting the above technical solution, the battery cell 20 can take into account both the space and the structural strength below the sealing ring, resulting in better sealing performance of the battery cell 20.

[0136] In some embodiments, the adapter piece 2212 has a third thickness H3, and the ratio of the second thickness H2 to the third thickness is greater than or equal to 1 and less than or equal to 3, i.e., 1≤H2 / H3≤3.

[0137] The thickness of the second segment 2312b can be greater than or equal to the thickness of the adapter piece 2212. The thickness of the adapter piece 2212 does not need to be set too thick to avoid occupying too much space. The thickness of the second segment 2312b must meet the requirements of the welding penetration. If the ratio of the second thickness H2 to the third thickness H3 is greater than 3, the second segment 2312b may occupy too much space.

[0138] By adopting the above technical solution, the electrode terminal 23 can meet the requirements of melting depth without taking up too much space in the battery cell 20.

[0139] like Figure 9 As shown, the adapter piece 2212 is stepped and is connected to both the first segment 2312a and the second segment 2312b.

[0140] The adapter piece 2212 has a stepped plate structure. One end of the adapter piece 2212 is attached to the second segment 2312b, and the other end is attached to the first segment 2312a and the tab 2211. Figure 9 (Not indicated).

[0141] By adopting the above technical solution, the shape of the adapter piece 2212 is adapted to the shape of the electrode terminal 23 to meet the welding requirements.

[0142] Please refer to Figures 3 to 9In some embodiments, the battery cell 20 includes a housing 21, an electrode assembly 22, and electrode terminals 23. The electrode assembly 22 is provided with an electrode connector 221, which includes a tab 2211 and an adapter 2212. The electrode terminal 23 includes a body 231 and a terminal post 232 protruding from one side of the body 231. The terminal post 232 passes through an electrode lead-out hole. The body 231 has a first side surface 231a and a second side surface 231b arranged opposite each other along the length direction of the first wall. Side 1a is located near the outer side of the outer casing 21, and side 231b is located near the middle of the outer casing 21. The distance between side 231a and terminal 232 is greater than the distance between side 231a and terminal 232. The center distance W1 between the two tabs 2211 is less than the center distance W3 between the two terminals 232. The adapter piece 2212 is pre-welded to the tabs 2211 to form a second solder mark 32. The adapter piece 2212 is welded to the body 231 to form a first solder mark 31. The second solder mark 32 is closer to the middle of the outer casing 21 than the first solder mark 31. The battery cell 20 provided in this embodiment provides a larger misalignment space for the tabs and optimizes the arrangement space of the battery cell 20.

[0143] Please refer to Figures 10 to 12 Some embodiments of this application provide a battery cell 20, including a housing 21, an electrode assembly 22, and an electrode terminal 23. The first wall 211 of the housing 21 is provided with an electrode lead-out hole 212. The electrode assembly 22 is disposed inside the housing 21 and is provided with an electrode connector 221. The electrode post 232 is disposed on the first wall 211 of the housing 21. The electrode terminal 23 includes a body 231 and an electrode post 232 protruding from one side of the body 231. The electrode post 232 passes through the electrode lead-out hole 212. The body 231 is disposed inside the housing 21 and is electrically connected to the electrode connector 221. The body 231 has a first side surface 231a and a second side surface 231b disposed opposite to each other along a first direction. The distance between the first side surface 231a and the electrode post 232 is greater than the distance between the second side surface 231b and the electrode post 232. In this embodiment, the first side 231a is the side of the body 231 near the middle of the outer shell 21, and the second side 231b is the side of the body 231 near the edge of the outer shell 21. That is, the body 231 is offset towards the inside of the outer shell 21 relative to the pole post 232.

[0144] In some embodiments, such as Figures 10 to 12 As shown, the first direction is the length direction of the first wall 211; in other embodiments, the first direction may also be the width direction of the first wall 211.

[0145] By adopting the above technical solution, the body 231 leaves a clearance space on the side near the edge of the outer shell 21, which reduces the space occupied by the electrode terminal 23 in the edge area of ​​the battery cell 20. The space between the body 231 and the edge of the outer shell 21 can be used to arrange other components, such as pressure strips, and can also optimize the arrangement space of components in the battery cell 20.

[0146] Please refer to Figure 11 , Figure 13 and Figure 14 In some embodiments, the body 231 has a third side surface 231c and a fourth side surface 231d disposed opposite to each other along a second direction, the second direction being the width direction (Y direction) of the first wall 211; the distance between the third side surface 231c and the pole post 232 is greater than the distance between the fourth side surface 231d and the pole post 232.

[0147] The center of the pole post 232 can be located on the center line of the width direction of the first wall 211. The distance between the third side surface 231c and the pole post 232 is greater than the distance between the fourth side surface 231d and the pole post 232, that is, the distance between the third side surface 231c and the center line of the width direction of the first wall 211 is greater than the distance between the fourth side surface 231d and the center line of the width direction of the first wall 211. In this way, the body 231 is offset relative to the pole post 232 along the width direction of the first wall 211, and the solder joint between the tab 2211 and the body 231 can also be offset relative to the width center line of the first wall 211, which facilitates the contact and welding of the tab 2211 and the body 231.

[0148] By adopting the above technical solution, the body 231 is offset relative to the electrode post along the length direction of the first wall 211. At the same time, the body 231 is also offset relative to the electrode post 232 along the width direction of the first wall 211, which facilitates the welding of the tab 2211 to the electrode terminal 23, reduces the redundancy of the tab 2211, and thus reduces the space occupied by the tab, which is beneficial to improving the energy density of the battery.

[0149] Please refer to Figures 10 to 16 In some embodiments, the body 231 includes an electrode connection portion 2311 and a first extension portion 2312. The electrode connection portion 2311 and the electrode 232 are correspondingly disposed along the thickness direction (Z direction) of the first wall 211. The first extension portion 2312 extends from the electrode connection portion 2311 along a first direction toward the middle of the outer shell 21. A first side surface 231a is disposed on the first extension portion 2312. The electrode connector 221 is an electrode tab 2211. The first extension portion 2312 extends toward the center line of the outer shell 21. The first extension portion 2312 is welded to the electrode tab 2211 to form a first solder mark 31.

[0150] The solution provided in this embodiment eliminates the adapter piece 2212 and directly welds the electrode terminal 23 to the electrode tab 2211. Specifically, the first extension 2312 in the electrode terminal 23 is welded to the electrode tab 2211 and forms a first solder mark 31, which can be a laser solder mark.

[0151] Among them, the center distance W1 of the two tabs 2211 is smaller than the center distance W3 of the two pole posts 232. Since the first extension 2312 extends towards the center line of the outer shell 21, that is, towards the middle of the outer shell 21, it is convenient for the tabs 2211 to be directly welded to the first extension 2312, and the tabs 2211 can obtain a larger misaligned arrangement space, which is beneficial to the arrangement of the size of the tabs 2211.

[0152] Please refer to Figure 10 , Figure 13 and Figure 14 In some embodiments, the tab 2211 includes a plurality of stacked tab portions, which are welded together to form a second solder mark 32, the projection of the second solder mark 32 toward the electrode terminal 23 falling entirely within the body 231.

[0153] Specifically, multiple electrode tabs are pre-welded using ultrasonic welding, and then the pre-welded electrode tabs 2211 are welded to the body 231 using laser welding to form a second weld mark 32. The projection of the second weld mark 32 toward the electrode terminal 23 falls entirely within the body 231; that is, along the length direction (X direction) of the first wall 211, the distance between the second weld mark 32 and the edge of the body 231 is greater than or equal to 0 mm, and along the width direction (Y direction) of the first wall 211, the distance between the second weld mark 32 and the edge of the body 231 is greater than or equal to 0 mm.

[0154] By adopting the above technical solution, the tab 2211 can be set to correspond with the first body 231 to facilitate welding, and the laser welding head can be prevented from pressing directly on the tab 2211 during laser welding, thus crushing or cracking the tab 2211.

[0155] Please refer to Figure 13 and Figure 14In some embodiments, the first direction is the length direction of the first wall 211; along the length direction of the first wall 211, the second solder mark 32 is offset inward relative to the body 231, that is, the second solder mark is offset in a direction closer to the length center of the first wall 211, and the distance between the inner edge of the second solder mark 32 and the inner edge of the body 231 is the first distance D1, D1 is greater than or equal to 1mm; along the width direction of the first wall, the second solder mark 32 is offset downward relative to the body 231, that is, the second solder mark is offset in a direction away from the width center of the first wall, and the distance between the lower edge of the second solder mark 32 and the lower edge of the body 231 is the second distance D2, D2 is greater than or equal to 1mm.

[0156] The edge of the second solder mark 32 can be a straight line, a curve, an arc, etc. Along the length direction of the first wall 211, the distance between the inner edge of the second solder mark 32 and the corresponding edge of the pole post 232 can be greater than or equal to 1 mm; at the same time, along the width direction of the first wall 211, the distance between the lower edge of the second solder mark 32 and the corresponding edge of the pole post 232 can be greater than or equal to 1 mm.

[0157] Optionally, both the first distance D1 and the second distance D2 are less than 2mm. The larger the first distance D1, the further out the tab is, and the less space is left for tab misalignment; the larger the second distance D2, the higher the tab is, and increasing the tab height will increase costs.

[0158] By adopting the above technical solution, the tabs can be staggered inside the battery cell, and the second solder mark 32 falls completely within the range of the electrode terminal 23, thus improving the welding quality.

[0159] Please refer to Figure 14 In some embodiments, the first direction is the length direction of the first wall 211; the projection of the first solder mark 31 on the body 231 falls within the projection of the second solder mark 32 on the body 231; along the width direction of the first wall 211, there is a third distance D3 between the opposite edges of the first solder mark 31 and the second solder mark 32; along the length direction of the first wall 211, there is a fourth distance D4 between the opposite edges of the first solder mark 31 and the second solder mark 32; both the third distance D3 and the fourth distance D4 are greater than 0 and less than twice the width W6 of the first solder mark 31.

[0160] Specifically, along the width direction (Y direction) of the first wall 211, there is a third distance D3 between the opposite edges of the first solder mark 31 and the second solder mark 32; along the length direction (X direction) of the first wall 211, there is a fourth distance D4 between the opposite edges of the first solder mark 31 and the second solder mark 32; wherein,

[0161] 0 < D3 ≤ 2W6, and 0 < D4 ≤ 2W6.

[0162] By adopting the above technical solution, the projection of the first solder mark 31 on the electrode terminal 23 falls within the projection of the second solder mark 32 on the electrode terminal 23, which can improve the welding reliability of the tab 2211 and the body 231.

[0163] Please refer to Figure 15 and Figure 16 In some embodiments, the ratio of the thickness H4 of the body 231 to the thickness of the tab 2211 is greater than or equal to 3.

[0164] After laser welding of the tab 2211, the tab 2211 and the body 231 need to be laser welded together. The ratio of the thickness of the body 231 to the thickness of the tab 2211 is greater than or equal to 3, which ensures that the thickness of the first body 231 is greater than the laser welding penetration depth, making it less likely to weld through the body 231 during welding. Optionally, the thickness of the body 231 can be, but is not limited to, 2mm. If the thickness of the body 231 is too large, it will occupy the internal space of the battery cell 20.

[0165] In some embodiments, the penetration depth of the first solder mark 31 on the body is less than or equal to the thickness of the body 231.

[0166] The penetration depth of the first weld mark 31 on the body is less than or equal to the thickness H4 of the body 231, which makes it difficult to weld through the body 231 during laser welding.

[0167] In some embodiments, the penetration depth of the first weld mark 31 on the body is less than or equal to half the thickness H4 of the body 231. By adopting the above technical solution, the influence of welding heat on the compression of the sealing ring can be reduced.

[0168] In some embodiments, the first wall 211 of the housing 21 is further provided with an injection hole 213 and an explosion-proof valve mounting hole 214, and an injection hole baffle 24 for sealing the injection hole 213 and an explosion-proof valve 25 passing through the explosion-proof valve mounting hole 214 are installed on the first wall 211. The injection hole 213 and the explosion-proof valve 25 are spaced apart between two electrode lead-out holes 212. The body 231 has a first height H5 on the inner surface of the first wall 211, and the injection hole baffle 24 has a second height H6 on the inner surface of the first wall 211. The first height H5 and the second height H6 may be equal or unequal.

[0169] Optionally, the first height H5 and the second height H6 are equal, that is, the body 231 and the injection hole baffle 24 are set at the same height on the first wall 211, and the injection hole baffle 24 will not abut against the electrode tab; alternatively, the first height H5 and the second height H6 may not be equal, for example, the first height H5 is greater than the second height H6, or the first height H5 is less than the second height H6.

[0170] By adopting the above technical solution, the adapter piece is eliminated in the battery cell 20, which solves the problem that the adapter piece needs to avoid the liquid injection hole baffle 24 in the prior art. The height of the liquid injection hole baffle 24 and the body 231 can be flexibly set.

[0171] In some embodiments, the second height H6 is smaller than the first height H5.

[0172] Specifically, the height of the injection hole baffle 24 on the inner surface of the first wall 211 is less than the height of the body 231 on the inner surface of the first wall 211. When the electrode tab is welded to the body 231, the injection hole baffle 24 is less likely to interfere with the electrode tab.

[0173] In some embodiments, the explosion-proof valve 25 has a third height H7 on the inner surface of the first wall 211; wherein the second height H6 is greater than the first height H5, and the sum of the second height H6, the thickness of the tab 2211, and the thickness of the adhesive paper attached to the tab 2211 is less than the third height H7.

[0174] Specifically, the thickness of the tab 2211 is set to H8, and the thickness of the adhesive tape attached to the tab 2211 is typically 0.15mm; the height of the injection hole baffle 24 on the inner surface of the first wall 211 is greater than the height of the body 231 on the inner surface of the first wall 211. In this case, the following conditions need to be met:

[0175] H6+H8+0.15<H7.

[0176] It is understandable that if the thickness of the adhesive tape can be adjusted, then the above conditions should be adjusted accordingly.

[0177] By adopting the above technical solution, the height of the injection hole baffle 24 on the inner surface of the first wall can be greater than the height of the body 231 on the inner surface of the first wall. By satisfying the above conditions, the probability of the electrode tab being lifted up by the injection hole baffle 24 and inserted into the electrode sheet can be reduced.

[0178] Please refer to Figure 3 , Figure 10 In some embodiments, the tab 2211 has a misaligned space within the battery cell 20, and the length W4 of the misaligned space is greater than or equal to 8 mm.

[0179] The tab 2211 includes multiple stacked tab portions, and the arrangement of these tab portions may be misaligned. The length W4 of the misalignment space refers to the length of the misalignment space along the length direction (X direction) of the first wall 211. Because the offset setting of the electrode terminals in the battery cell 20 provided in this embodiment can optimize the arrangement space of the components, it facilitates the misalignment of the tabs, allowing the misalignment space length of the tab 221 to reach more than 8 mm.

[0180] Optionally, the length of the misalignment space can be greater than or less than 12mm.

[0181] By adopting the above technical solution, the battery cell 20 provided in this embodiment can allow multiple electrode tabs to be arranged in a staggered manner within a large misalignment space. Please refer to... Figures 10 to 16 This application provides a battery cell 20, including a housing 21, an electrode assembly 22, and electrode terminals 23. The electrode assembly 22 is provided with an electrode connector 221, which is a tab 2211. The electrode terminal 23 includes a body 231 and a terminal post 232 protruding from one side of the body 231. The body 231 has a first side surface 231a and a second side surface 231b disposed opposite to each other along the length direction of the first wall 211. The first side surface 231a is disposed on the side of the body 211 near the edge of the housing, and the distance between the first side surface 231a and the terminal post 232 is greater than the distance between the second side surface 231b and the terminal post 232, that is, the body 211 is offset outward relative to the terminal post. The body 231 includes a terminal post connecting portion 2311 and a first extension portion 2312. The first extension portion 2312 is welded to the tab 2211 to form a first solder mark 31. A second solder mark 32 is formed on the tab, and the projection of the second solder mark 32 toward the electrode terminal 23 falls completely within the body 231. The battery cell 20 provided in this embodiment offers a large misalignment space for the tabs and optimizes the arrangement space of the battery cell 20.

[0182] In some other embodiments, the body 231 has a first side and a second side disposed opposite to each other along a first direction, the distance between the first side and the pole post 232 is greater than the distance between the second side and the pole post 232, wherein the first direction is the width direction of the body 231.

[0183] By adopting the above technical solution, the body 231 is offset relative to the electrode post 232 in the width direction of the first wall. One end of the body can provide a certain clearance space for the components in the battery cell 20, thus optimizing the arrangement space of the components in the battery cell 20. In addition, the body 231 can be offset toward the side where the electrode connector 221 is located, which facilitates the welding of the electrode connector 221 to the body 231, reduces the redundancy and space occupied by the electrode connector 221, and helps to improve the energy density of the battery cell 20.

[0184] The second aspect of this application provides a battery 100, including the battery cell 30 provided in the first aspect.

[0185] A third aspect of this application provides an electrical device including a battery 100 provided in the second aspect, the battery 100 being used to provide electrical energy to the electrical device.

[0186] The electrical device can be any of the aforementioned battery-using devices or systems.

[0187] It should be noted that, where there is no conflict, the features in the embodiments of this application can be combined with each other.

[0188] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended 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 of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A battery cell, characterized in that, include: The outer casing has electrode lead-out holes on its first wall; An electrode assembly is disposed within the housing, and the electrode assembly is provided with electrode connectors; An electrode terminal includes a body and a post protruding from one side of the body. The post passes through the electrode lead-out hole. The body is disposed inside the housing and is electrically connected to the electrode connector. The body has a first side and a second side disposed opposite to each other along a first direction. The distance between the first side and the pole post is greater than the distance between the second side and the pole post. The first side is close to the edge of the first wall, and the second side is close to the middle of the first wall.

2. The battery cell as described in claim 1, characterized in that: The body includes a pole post connecting part and a first extension part. The pole post connecting part is disposed corresponding to the pole post along the thickness direction of the first wall. The first extension part extends from the pole post connecting part along the first direction, which is the length direction of the first wall. A first solder mark is formed between the body and the electrode connector, and the first solder mark is at least partially located in the first extension.

3. The battery cell as described in claim 2, characterized in that: The body has a third side and a fourth side disposed opposite to each other along a second direction, the second direction being the width direction of the first wall; The distance between the third side and the pole post is greater than the distance between the fourth side and the pole post.

4. The battery cell as described in claim 2, characterized in that: The electrode lead-out hole, the electrode connector, and the electrode terminal are each provided in two forms, and the electrode connector includes a tab; The center distance between the two electrodes is less than the center distance between the two pole posts.

5. The battery cell according to any one of claims 2-4, characterized in that: The electrode connector includes an electrode tab and an adapter plate, and the adapter plate is welded to the electrode tab and the body respectively; The first extension extends toward a direction away from the centerline of the housing, and the first solder mark is formed between the first extension and the adapter piece.

6. The battery cell as described in claim 5, characterized in that: A second solder mark is formed between the electrode tab and the adapter piece, and the second solder mark is located on the side of the first solder mark near the middle of the first wall.

7. The battery cell as described in claim 5, characterized in that: The first extension includes a first segment having a first thickness and a second segment having a second thickness. The first segment is located between the pole post connection and the second segment, and the first solder mark is located in the second segment. The second thickness is greater than or equal to the first thickness.

8. The battery cell as described in claim 7, characterized in that: The ratio of the second thickness to the first thickness is greater than or equal to 1 and less than or equal to 3.

9. The battery cell as described in claim 7, characterized in that: The adapter plate has a third thickness, wherein the ratio of the second thickness to the third thickness is greater than or equal to 1 and less than or equal to 3.

10. The battery cell as described in claim 7, characterized in that: The adapter plate is stepped and connects both the first segment and the second segment.

11. The battery cell according to any one of claims 2-4, characterized in that: The first extension extends toward the centerline of the housing; the electrode connector is a tab, which is welded to at least the first extension.

12. The battery cell as described in claim 11, characterized in that: The electrode tab includes multiple electrode tab portions, which are welded together to form a second solder mark. The projection of the second solder mark toward the electrode terminal falls entirely within the body.

13. The battery cell as described in claim 12, characterized in that: Along the length of the first wall, the second solder mark is offset inward relative to the body, and there is a first distance between the inner edge of the second solder mark and the inner edge of the body. Along the width direction of the first wall, the second solder mark is offset downward relative to the body, and there is a second distance between the lower edge of the second solder mark and the lower edge of the body; At least one of the first distance and the second distance is greater than or equal to 1 mm.

14. The battery cell as described in claim 12, characterized in that: The projection of the first solder mark on the body falls within the projection of the second solder mark on the body; Along the width direction of the first wall, there is a third distance between the edge of the first solder mark and the edge of the second solder mark; Along the length of the first wall, there is a fourth distance between the edge of the first solder mark and the edge of the second solder mark; Both the third distance and the fourth distance are greater than 0 and less than twice the width of the first solder mark.

15. The battery cell as described in claim 11, characterized in that: The ratio of the thickness of the body to the thickness of the tab is greater than or equal to 3.

16. The battery cell as described in claim 11, characterized in that: The penetration depth of the first solder mark on the body is less than or equal to the thickness of the body.

17. The battery cell as described in claim 16, characterized in that: The penetration depth of the first solder mark on the body is less than or equal to half the thickness of the body.

18. The battery cell as described in claim 11, characterized in that: The first wall of the outer casing is also provided with a liquid injection hole and an explosion-proof valve mounting hole, and the first wall is provided with a liquid injection hole baffle to seal the liquid injection hole and an explosion-proof valve passing through the explosion-proof valve mounting hole, with the liquid injection hole and the explosion-proof valve being spaced apart. The electrode terminals have a first height on the inner surface of the first wall; The injection hole baffle has a second height on the inner surface of the first wall; The first height may be equal to or different from the second height.

19. The battery cell as described in claim 18, characterized in that: The second height is smaller than the first height.

20. The battery cell as described in claim 18, characterized in that: The explosion-proof valve has a third height on the inner surface of the first wall; Wherein, the second height is greater than the first height, and the sum of the second height, the thickness of the tab, and the thickness of the adhesive paper attached to the tab is less than the third height.

21. The battery cell as described in claim 1, characterized in that: The first direction is the width direction of the first wall.

22. The battery cell according to any one of claims 1-4, 6-10, and 12-21, characterized in that: The electrode connector includes a tab, which has a misalignment space within the battery cell, and the length of the misalignment space is greater than or equal to 8 mm.

23. A battery, characterized in that, Includes the battery cell as described in any one of claims 1-22.

24. An electrical appliance, characterized in that, Includes the battery as described in claim 23, the battery being used to provide electrical energy to the electrical device.

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