Battery cell, battery, and electrical apparatus

Abstract

The present application relates to the technical field of batteries, and provides a battery cell, a battery, and an electrical apparatus. The battery cell (20) comprises: a casing (21), wherein an electrode lead-out hole (212) is formed on a first wall (211) of the casing; an electrode assembly (22), provided in the casing, wherein the electrode assembly is provided with an electrode connecting member (221); and an electrode terminal (23), comprising a body (231) and an electrode column (232) arranged on one side of the body in a protruding mode, wherein the electrode column penetrates through the electrode lead-out hole, the body is arranged in the casing and is electrically connected to the electrode connecting member, the body has a first side surface (231a) and a second side surface (231b) that are arranged opposite to each other in a first direction, and the distance between the first side surface and the electrode column is greater than the distance between the second side surface and the electrode column. The battery cell provided by the present application can optimize the arrangement space of the elements in the battery cell.

Description

Battery cells, batteries and electrical devices

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on September 7, 2023, with application number 202311152901.8, and invention name “Battery Cell, Battery and Electrical Device”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of battery technology, and in particular to a battery cell, a battery, and an electrical device. Background Art

[0003] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. Electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of the sustainable development of the automotive industry. For electric vehicles, battery technology is a key factor in their development.

[0004] Power batteries generally include battery cells, and the arrangement space within the battery cells is compact, which limits the arrangement of components in the battery cells.

[0005] Summary of the Invention

[0006] In view of this, embodiments of the present application provide a battery cell, a battery, and an electrical device, which can optimize the arrangement space of components in the battery cell.

[0007] An embodiment of the first aspect of the present application provides a battery cell, comprising:

[0008] A housing, wherein a first wall of the housing is provided with an electrode lead-out hole;

[0009] an electrode assembly disposed in the housing, wherein the electrode assembly is provided with an electrode connector;

[0010] The electrode terminal comprises a body and a pole protruding from one side of the body, the pole passing through the electrode lead-out hole, the body being disposed in the housing and electrically connected to the electrode connector;

[0011] The body has a first side surface and a second side surface that are oppositely arranged along the first direction, and a distance between the first side surface and the pole is greater than a distance between the second side surface and the pole.

[0012] The battery cell provided in the embodiments of the present application includes a housing, an electrode assembly, and an electrode terminal. The first wall of the housing is provided with an electrode lead-out hole, and the electrode assembly is provided with an electrode connector. Because the body of the electrode terminal is offset relative to the centerline of the electrode lead-out hole and the electrode post, one end of the body can be used to connect to the electrode connector, while the other end can provide a certain amount of clearance for components within the battery cell, thereby optimizing the arrangement of components within the battery cell. Furthermore, due to the eccentric structure of the electrode terminal, the electrode terminal itself has high torsional strength.

[0013] In some embodiments, the body includes a pole connecting portion and a first extending portion, the pole connecting portion and the pole are arranged correspondingly along the thickness direction of the first wall, and the first extending portion extends from the pole connecting portion along the first direction, and the first direction is the length direction of the first wall;

[0014] A first weld mark is formed between the body and the electrode connector, and the first weld mark is at least partially located on the first extension portion.

[0015] By adopting the above technical solution, the main body is offset relative to the pole, and the first weld mark between the main body and the electrode connector is at least partially located in the first extension portion. The first extension portion can be used as the welding area between the electrode terminal and the electrode connector. On the basis of optimizing the component layout space, the electrode terminal can meet the welding requirements.

[0016] In some embodiments, the body has a third side surface and a fourth side surface that are oppositely disposed along a second direction, and the second direction is a width direction of the first wall;

[0017] The distance between the third side surface and the pole is greater than the distance between the fourth side surface and the pole.

[0018] By adopting the above technical solution, the main body is offset relative to the pole along the length direction of the first wall. At the same time, the main body is also offset relative to the pole along the width direction of the first wall, which facilitates welding 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.

[0019] In some embodiments, the electrode lead-out hole, the electrode connector, and the electrode terminal are each provided with two, and the electrode connector includes a tab;

[0020] The center distance between the two tabs is smaller than the center distance between the two poles.

[0021] By adopting the above technical solution, when the pole center distance is small, the center distance of the tab is smaller than the center distance of the tab, and the offset setting of the body can increase the misalignment space of the tab.

[0022] The electrode connector includes a tab and a transfer plate, and the transfer plate is welded to the tab and the body respectively;

[0023] The first extension portion extends in a direction away from the center line of the housing, and the first weld mark is formed between the first extension portion and the adapter plate.

[0024] By adopting the above technical solution, the first extension portion provides a larger welding area for welding between the electrode terminal and the electrode connector, which is beneficial to improving the welding quality.

[0025] In some embodiments, a second weld mark is formed between the tab and the adapter plate, and the second weld mark is arranged on a side of the first weld mark close to the middle of the first wall.

[0026] By adopting the above technical solution, the laser welding area and the ultrasonic welding area are staggered by the adapter, which is beneficial to the arrangement of the tabs and makes the staggered space of the tabs more sufficient.

[0027] In some embodiments, the first extension portion includes a first section having a first thickness and a second section having a second thickness, the first section is arranged between the pole connecting portion and the second section, and the first weld mark is located in the second section; the second thickness is greater than or equal to the first thickness.

[0028] By adopting the above technical solution, the second section can meet the requirements of laser welding penetration.

[0029] 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.

[0030] By adopting the above technical solution, the battery cell can take into account both the space and the structural strength below the sealing ring, so that the sealing performance of the battery cell is better.

[0031] In some embodiments, the adapter sheet has a third thickness, and a ratio of the second thickness to the third thickness is greater than or equal to and less than or equal to 3.

[0032] By adopting the above technical solution, the electrode terminal can meet the requirement of melting depth without occupying too much space in the battery cell.

[0033] In some embodiments, the adapter is in a stepped shape, and two ends of the adapter are respectively connected to the first section and the second section.

[0034] By adopting the above technical solution, the shape of the adapter piece is adapted to the shape of the electrode terminal to meet welding requirements.

[0035] In some embodiments, the first extension portion extends toward a direction close to the center line of the housing; the electrode connector is a tab, and the tab is welded to at least the first extension portion.

[0036] By adopting the above technical solution, a clearance space is left on the side of the main body close to the edge of the shell, reducing the space occupied by the electrode terminals in the edge area of ​​the battery cell. The space between the main body and the edge of the shell can be conveniently arranged with other components, such as moldings, etc., and can also optimize the arrangement space of the components in the battery cell.

[0037] In some embodiments, the electrode tab includes a plurality of electrode tab portions, the plurality of electrode tab portions are welded to form a second weld mark, and a projection of the second weld mark toward the electrode terminal completely falls within the body.

[0038] By adopting the above technical solution, the tabs can be arranged correspondingly to the body to facilitate welding, and the laser welding head can be prevented from directly pressing on the tabs during laser welding to crush or crack the tabs.

[0039] In some embodiments, along the length direction of the first wall, the second weld mark is offset inward relative to the body, and an inner edge of the second weld mark is at a first distance from an inner edge of the body;

[0040] The second weld mark is offset downward relative to the main body along the width direction of the first wall, and a second distance is formed between a lower edge of the second weld mark and a lower edge of the main body;

[0041] At least one of the first distance and the second distance is greater than or equal to 1 mm.

[0042] By adopting the above technical solution, the second weld mark can be completely within the range of the electrode terminal.

[0043] In some embodiments, the projection of the second weld mark on the body falls within the first weld mark;

[0044] A third distance exists between an edge of the first weld mark and an edge of the second weld mark along the width direction of the first wall;

[0045] Along the length direction of the first wall, there is a fourth distance between the edge of the first weld mark and the edge of the second weld mark;

[0046] The third distance and the fourth distance are both greater than 0 and less than 2 times the first weld mark width.

[0047] By adopting the above technical solution, the projection of the second weld mark on the electrode terminal falls within the projection of the first weld mark on the electrode terminal, which can improve the welding reliability between the tab and the body.

[0048] In some embodiments, a ratio of the thickness of the body to the thickness of the tab is greater than or equal to 3.

[0049] By adopting the above technical solution, the thickness of the body can be made greater than the laser welding penetration, and it is not easy to penetrate the body during welding.

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

[0051] By adopting the above technical solution, it is possible to prevent the body from being easily penetrated during laser welding.

[0052] In some embodiments, the penetration of the first weld mark on the body is less than or equal to half the thickness of the body.

[0053] By adopting the above technical solution, the influence of welding heat on the compression of the sealing ring can be reduced.

[0054] 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 a liquid injection hole baffle for sealing the liquid injection hole and an explosion-proof valve passing through the explosion-proof valve mounting hole are installed on the first wall, and the liquid injection hole and the explosion-proof valve are spaced apart.

[0055] The electrode terminal has a first height on the inner surface of the first wall;

[0056] The injection hole baffle has a second height on the inner surface of the first wall;

[0057] The first height is equal to or different from the second height.

[0058] By adopting the above technical solution, the adapter plate is eliminated, which solves the problem in the prior art that the adapter plate needs to avoid the injection hole baffle. The height of the injection hole baffle and the body can be flexibly set.

[0059] In some embodiments, the second height is less than the first height.

[0060] By adopting the above technical solution, when the tab is welded to the body, the injection hole baffle is unlikely to interfere with the tab.

[0061] In some embodiments, the explosion-proof valve has a third height above the inner surface of the first wall;

[0062] 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 tape attached to the tab is less than the third height.

[0063] By adopting the above technical solution, the probability of the electrode tab being lifted up by the injection hole baffle and inserted into the electrode piece can be reduced.

[0064] In some embodiments, the first direction is a width direction of the first wall.

[0065] By adopting the above technical solution, the main body is offset relative to the pole in the width direction of the first wall, and one end of the main body can provide a certain avoidance space for the components in the battery cell, thereby optimizing the arrangement space of the components in the battery cell; and the main body can be offset toward the side where the electrode connector is located, which facilitates the welding of the electrode connector and the main body, reduces the redundancy of the electrode connector and the space occupied, and is conducive to improving the energy density of the battery cell.

[0066] In some embodiments, the electrode connector includes a tab, the tab has a misalignment space in the battery cell, and the length of the misalignment space is greater than or equal to 8 mm.

[0067] An embodiment of the second aspect of the present application provides a battery, comprising the battery cell provided in the first aspect.

[0068] An embodiment of the third aspect of the present application provides an electrical device, comprising the battery provided in the second aspect.

[0069] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0070] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or conventional technical descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0071] FIG1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0072] FIG2 is a schematic structural diagram of a battery provided in some embodiments of the present application;

[0073] FIG3 is a schematic structural diagram of a battery cell provided in some embodiments of the present application;

[0074] FIG4 is a bottom view of the first wall of the battery cell shown in FIG3 ;

[0075] FIG5 is a cross-sectional view of the first wall shown in FIG4 along line AA;

[0076] FIG6 is a partial schematic diagram of the first wall shown in FIG5;

[0077] FIG7 is a top view of the battery cell shown in FIG3 ;

[0078] FIG8 is a cross-sectional view of the battery cell shown in FIG7 along line BB;

[0079] FIG9 is a partial enlarged view of section C of the battery cell shown in FIG8 ;

[0080] FIG10 is a schematic structural diagram of a battery cell provided in some other embodiments of the present application;

[0081] FIG11 is a top view of the battery cell shown in FIG10 ;

[0082] FIG12 is a cross-sectional view of the battery cell shown in FIG11 along line DD;

[0083] FIG13 is a bottom view of the first wall of the battery cell shown in FIG10 ;

[0084] FIG14 is a schematic diagram of a partial structure of the first wall shown in FIG13;

[0085] FIG15 is a cross-sectional view of the first wall shown in FIG13 along line EE;

[0086] FIG16 is a partial schematic diagram of the cross-sectional view shown in FIG15.

[0087] The meanings of the marks in the figure are: 1000, vehicle; 100, battery; 200, controller; 300, motor; 10, box; 11, first part; 12, Part 2; 20. Battery cell; 21. Casing; 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. Post connector; 2312. First extension; 2312a. First section; 2312b. Second section; 2313. Second extension; 232. Post; 233. Riveted piece; 24. Liquid injection hole baffle; 25. Explosion-proof valve; 31. First weld mark; 32. Second weld mark. Modes for Carrying Out the Invention

[0088] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0089] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0090] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0091] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0092] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0093] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0094] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the embodiments of the present application.

[0095] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0096] A power battery generally includes a battery cell, which includes an electrode assembly, a shell that accommodates the electrode assembly, and an end cover covered on the shell. The end cover is usually provided with two poles and a liquid injection hole. The poles are connected to the tabs on the electrode assembly through an adapter.

[0097] Research has found that the arrangement space inside the battery cell is compact, which limits the arrangement of components in the battery cell.

[0098] To address the aforementioned issues, after in-depth research, a battery cell was designed, comprising a housing, an electrode assembly, and two electrode terminals. The housing's first wall is provided with an electrode lead-out hole, the electrode assembly is disposed within the housing, and an electrode connector is provided on the electrode assembly. An electrode post is disposed on the first wall of the housing. The electrode terminal comprises a body and an electrode post protruding from one side of the body. The electrode post is disposed within the electrode lead-out hole, and the body is disposed within the housing and electrically connected to the electrode connector. The body comprises a first side surface and a second side surface disposed opposite each other along a first direction, with the distance between the first side surface and the electrode post being greater than the distance between the second side surface and the electrode post. Because the body of the electrode terminal is offset relative to the electrode lead-out hole and the electrode post, one end of the body can be used for connection to the electrode connector, while the other end provides a certain amount of clearance, thereby optimizing the arrangement of components in the battery cell.

[0099] The battery cells provided in the embodiments of the present application can be used in electrical devices that use batteries as power sources. The electrical devices may include, but are not limited to, mobile phones, tablets, laptop computers, electric toys, power tools, battery-powered vehicles, electric vehicles, ships, spacecraft, and the like. Among them, electric toys may include fixed or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys, and electric airplane toys, and the like. Spacecraft may include airplanes, rockets, space shuttles, and spacecraft, and the like.

[0100] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0101] Please refer to Figure 1, which is a schematic structural diagram of a vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 can be provided at the bottom, head or tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000. For example, the battery 100 can serve as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0102] In some embodiments of the present application, the battery 100 can serve not only as an operating power source for the vehicle 1000, but also as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0103] Please refer to Figure 2, which is an exploded view of a battery 100 provided in some embodiments of the present application. In some embodiments, the battery 100 includes a housing 10 and a battery cell 20, wherein the battery cell 20 is accommodated in the housing 10.

[0104] The box body 10 is used to provide a storage space for the battery cells, and the box body 10 can adopt a variety of structures. In some embodiments, the box body 10 may include a first part 11 and a second part 12, and the first part 11 and the second part 12 cover each other, and the first part 11 and the second part 12 jointly define a storage space for accommodating the battery cells. The second part 12 can be a hollow structure with one end open, and the first part 11 can be a plate-like structure, and the first part 11 covers the open side of the second part 12, so that the first part 11 and the second part 12 jointly define a storage space; the first part 11 and the second part 12 can also be hollow structures with one side open, and the open side of the first part 11 covers the open side of the second part 12. Of course, the box body 10 formed by the first part 11 and the second part 12 can be a variety of shapes, such as a cylinder, a cuboid, etc.

[0105] In the battery 100, there may be multiple battery cells 20, and the multiple battery cells 20 may be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections among the multiple battery cells 20. The multiple battery cells 20 may be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery cell 20 may be housed within the housing 10. Alternatively, the battery 100 may be constructed by first connecting multiple battery cells 20 in series, in parallel, or in a hybrid connection to form a battery module, which is then connected in series, in parallel, or in a hybrid connection to form a complete battery module, and then housed within the housing 10. The battery 100 may also include other structures, such as a busbar assembly for electrically connecting the multiple battery cells 20.

[0106] Each battery cell 20 may be a secondary battery or a primary battery, and may also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 may be cylindrical, flat, rectangular, or in other shapes.

[0107] An embodiment of the first aspect of the present application provides a battery cell 20. Referring to Figures 3 to 6 , the battery cell 20 includes a housing 21, an electrode assembly 22, and an electrode terminal 23. An electrode lead-out hole 212 is defined on a first wall 211 of the housing 21. The electrode assembly 22 is disposed within the housing 21. An electrode connector 221 is disposed on the electrode assembly 22. An 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 extends through the electrode lead-out hole 212. The body 231 is disposed within 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 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.

[0108] The outer shell 21 is an element used to form the internal environment of the battery cell 20. The internal environment formed by the outer shell 21 can be used to accommodate the electrode assembly 22, electrolyte, and other components. The outer shell 21 may include a shell with one end open and an end cap provided on the shell, or it may be an integrally molded structure. The outer shell 21 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the outer shell 21 can be determined according to the specific shape and size of the electrode assembly 22. The outer shell 21 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. An electrode lead-out hole 212 is provided on the first wall 211 of the outer shell 21. The first wall 211 with the electrode lead-out hole 212 can be provided on the side, top, or bottom of the outer shell 21. The electrode lead-out hole 212 is used to mount the electrode post 232. The electrode lead-out hole 212 can be a circular through hole or a through hole of other shapes.

[0109] The electrode assembly 22 is the component within the battery cell 20 where the electrochemical reaction occurs. One or more electrode assemblies 22 may be contained within the housing 21. The electrode assembly 22 is primarily composed of a positive electrode sheet and a negative electrode sheet wound or stacked, typically with a separator between them. The portions of the positive and negative electrode sheets containing active material constitute the main body of the electrode assembly 22, while the portions of the positive and negative electrode sheets without active material each constitute the tabs 2211.

[0110] The electrode connector 221 in the embodiment of the present application includes at least a tab 2211. In some embodiments, the electrode connector 221 may further include other components electrically connected between the tab 2211 and the electrode terminal 23. For example, the electrode connector 221 includes the tab 2211 and a transition piece 2212, and the transition piece 2212 is welded to the tab 2211 and the electrode terminal 23. During the charge and discharge process of the battery, the positive electrode active material and the negative electrode active material react with the electrolyte, and the electrode connector 221 connects to the electrode terminal 23 to form a current loop.

[0111] The electrode terminal 23 includes a body 231 and a post 232 protruding from one side of the body 231. The post 232 can be integral with the body 231 or separately and fixedly connected. The post 232 is inserted into the electrode lead-out hole 212 and is used to electrically connect to external electrical components. The body 231 is disposed within the housing 21 and welded to the electrode connector 221. The body 231 is used to electrically connect to the electrode connector 221. Optionally, the post 232 can be, but is not limited to, cylindrical, and the body 231 can be, but is not limited to, flat, such as a rectangular flat plate. The electrode terminal 23 may also include a rivet 233 disposed on the outside of the housing 21, connected to the post 232.

[0112] The electrode terminal 23 in the embodiment of the present application can be a negative electrode terminal or a positive electrode terminal. Along the first direction, the distances between the opposite ends of the body 231 and the centerline of the electrode lead-out hole 212 (line L in Figure 6) are different. The first direction can be the length direction (X direction) of the first wall 211 or the width direction (Y direction) of the first wall 211, or it can be other directions that are angled 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 each other along the first direction. The distances between the first side surface 231a and the second side surface 231b and the centerline of the electrode lead-out hole 212 are different, and the distance between the first side surface 231a and the electrode 232 is greater than the distance between the second side surface 231b and the electrode 232. The distance between the first side surface 231a and the electrode 232 refers to the minimum distance between the first side surface 231a and the electrode 232; the distance between the second side surface 231b and the electrode 232 refers to the minimum distance between the second side surface 231b and the electrode 232. Among them, the first side surface 231a and the second side surface 231b can be regular planes or irregular surfaces; when the pole 232 is cylindrical, the minimum distance between the first side surface 231a and the pole 232 is the minimum distance between the first side surface 231a and the cylindrical outer surface of the pole 232, and the minimum distance between the second side surface 231b and the pole 232 refers to the minimum distance between the second side surface 231b and the cylindrical outer surface of the pole 232.

[0113] As shown in Figures 5 and 6, in some embodiments, the distance between the first side surface 231a of the body 231 near the edge of the first wall 211 and the pole 232 is greater than the distance between the second side surface 231b of the body 231 near the middle of the first wall 211 and the pole 232. That is, the body 231 is offset relative to the electrode lead-out hole 212 and the pole 232 toward the outside of the housing 21. In this embodiment, the body 231 is generally rectangular; it will be understood that if the body 231 and the pole 232 are both circular, the center of the body 231 is offset relative to the center of the pole 232.

[0114] In this embodiment, because the body 231 is offset relative to the electrode lead-out hole 212 toward the outside of the outer shell 21, the space occupied by the electrode terminal 23 in the central region of the battery cell 20 is reduced, allowing the electrode terminal 23 to 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 center of the outer shell 21, which provides more space for the staggered arrangement of the tab 2211 and facilitates 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 outside of the outer shell 21, increasing the welding space between the electrode connector 221 and the body 231 and optimizing the arrangement space of the components in the battery cell 20.

[0115] In other embodiments, the main body 231 is offset toward the inner side of the outer shell 21 relative to the electrode lead-out hole 212 and the pole 232, thereby reducing the space occupied by the electrode terminal 23 in the edge area of ​​the battery cell 20. The space between the main body 231 and the edge of the outer shell 21 can be conveniently arranged with other components, such as moldings, etc., and can also optimize the arrangement space of the components in the battery cell 20.

[0116] In some other embodiments, the electrode connector 221 may also include only the tab 2211, that is, the adapter 2212 is eliminated. In this case, the main body 231 is offset toward the outside or inside of the shell 21, which can also provide a flexible installation space for the battery cell 20.

[0117] The battery cell 20 provided in the embodiment of the present application includes a housing 21, an electrode assembly 22, and an electrode terminal 23. An electrode lead-out hole 212 is provided on the first wall 211 of the housing 21, and an electrode connector 221 is provided on the electrode assembly 22. Because the body 231 of the electrode terminal 23 is offset relative to the centerline of the electrode lead-out hole 212 and the electrode post 232, that is, the centerline of the body 231 deviates from the centerline of the electrode lead-out hole 212 and the centerline of the electrode post 232, one end of the body 231 can be used to connect to the electrode connector 221, while the other end can provide a certain amount of avoidance space for components within the battery cell 20, thereby optimizing the arrangement space of the components in the battery cell 20. At the same time, due to the eccentric structure of the electrode terminal 23, the electrode terminal 23 itself has high torsional strength, which improves the overall strength of the battery cell 20.

[0118] Please refer to Figures 3 to 6. In some embodiments, the main body 231 includes a pole connecting portion 2311 and a first extension portion 2312. The pole connecting portion 2311 coincides with the projection of the pole 232 on the first wall 211. The first extension portion 2312 extends from the pole connecting portion 2311 along a first direction, where the first direction is the length direction or the width direction of the first wall 211. A first weld mark 31 (shown in Figure 3) is formed between the main body 231 and the electrode connector 221. The first weld mark 31 is at least partially located on the first extension portion 2312.

[0119] The pole connecting portion 2311 and the first extension portion 2312 are integrally structured. The projections of the pole connecting portion 2311 and the pole 232 on the first wall 211 coincide, i.e., the pole connecting portion 2311 and the pole 232 are arranged correspondingly in the thickness direction of the first wall 211. The distance from the edge of the first extension portion 2312 to the centerline of the electrode lead-out hole 212 is greater than the distance from the end of the body 231 opposite the first extension portion 2312 to the centerline of the electrode lead-out hole 212.

[0120] In this embodiment, the first direction is the length direction (X direction) of the first wall 211, and the first extension portion 2312 extends from the pole connecting portion 2311 toward the edge of the first wall 211, that is, the body 231 is offset relative to the pole 232 toward the outside of the housing 21. In other embodiments, the first extension portion 2312 may also extend from the pole connecting portion 2311 toward the center of the first wall 211. Optionally, the body 231 further includes a second extension portion 2313, and the second extension portion 2313 and the first extension portion 2312 are respectively provided on opposite sides of the pole connecting portion 2311. In another embodiment, the first direction may also be the width direction of the first wall 211, and the first extension portion 2312 extends from the pole connecting portion 2311 toward the edge of the first wall 211 in the width direction, that is, the body 231 is offset relative to the pole 232 in the width direction of the first wall 211. The body 231 and the electrode connector 221 are welded to achieve electrical connection. This welding of the body 231 and the electrode connector 221 forms a first weld mark 31 between the body 231 and the electrode connector 221. 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. Specifically, the first weld mark 31 may be completely within the first extension 2312, or partially within the first extension 2312 and partially within the terminal connection portion 2311. By employing this technical solution, the body 231 is offset relative to the terminal 232. 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 serves as the welding area between the electrode terminal 23 and the electrode connector 221. This optimizes component layout space, ensuring that the electrode terminal 23 meets welding area requirements.

[0121] There are two electrode lead-out holes 212, two electrode connectors 221, and two electrode terminals 23, respectively. The electrode connector 221 includes a tab 2211. In some embodiments, the center distance W1 of the two tabs 2211 is smaller than the center distance W3 of the two poles 232.

[0122] 5 also illustrates the length W2 of the first wall 211 . It is understood that the center distance W1 between the two tabs 2211 and the center distance W3 between the two poles 232 are both smaller than the length W2 of the first wall 211 .

[0123] The two tabs 2211 are respectively a negative tab and a positive tab, and the center distance W1 between the two tabs 2211 is the distance between the centers of the two tabs 2211. The center distance W1 between the two tabs 2211 is relatively small, and optionally, the center distance W1 between the two tabs 2211 can be less than or equal to 130 mm.

[0124] Taking the embodiments shown in Figures 3 to 9 as an example, since the center distance of the pole tabs 2211 is small, the electrode connector 221 includes not only the pole tabs 2211 but also a transfer plate 2212. In this way, the transfer plate 2212 is welded to the pole tabs 2211 to form a second weld mark 32, and the transfer plate 2212 is welded to the main body 231 to form a first weld mark 31; the main body 231 is offset toward the outside of the shell 21, and the second weld mark 32 is closer to the middle of the shell 21 than the first weld mark 31, so as to facilitate the arrangement of the pole tabs 2211 in the middle of the battery cell 20, providing a larger dislocation space for the pole tabs 2211.

[0125] By adopting the above technical solution, when the center distance of the poles 232 is small, the center distance of the tabs 2211 is smaller than the center distance of the poles 232, and the tabs 2211 have a larger arrangement space in the middle of the battery cell 20; and since the main body 231 is offset, it is conducive to obtaining a sufficient welding area.

[0126] In some embodiments, the electrode connector 221 also includes a transfer plate 2212, which is welded to the tab 2211 and the body 231 respectively; the first extension portion 2312 extends in a direction away from the center line of the shell 21, and the first weld mark 31 is formed between the first extension portion 2312 and the transfer plate 2212.

[0127] The first extension portion 2312 is offset toward the outside of the housing 21, and the first weld mark 31 is formed between the first extension portion 2312 and the adapter plate 2212. In this way, the first extension portion 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.

[0128] In some embodiments, the first direction is the length direction of the first wall 211, that is, the first side surface 231a and the second side surface 231b are arranged opposite to each other along the length direction of the first wall 211; a second weld mark 32 is formed between the tab 2211 and the adapter plate 2212, and the second weld mark 32 is arranged on one side of the first weld mark 31 close to the middle of the first wall 211.

[0129] The tab 2211 and the adapter sheet 2212 can be ultrasonically welded, i.e., 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., the first weld mark 31 and the second weld mark 32 are staggered. This not only provides a larger laser welding area between the adapter sheet 2212 and the electrode terminal 23, but also a larger ultrasonic welding area between the adapter sheet 2212 and the tab 2211. Furthermore, the second weld mark 32 is located on the side of the first weld mark 31 near the middle of the first wall 211, so that the pre-welding area of ​​the tab 2211 is closer to the middle of the battery cell 20, which helps to increase the space for the staggered arrangement of the tab 2211. Figure 3 illustrates the tab staggered line 2211a. As can be seen from Figure 3, the tab 2211 of the battery cell 20 includes multiple tab portions on the pole piece. The multiple tab portions can be staggered in the middle of the battery cell 20. Optionally, the multiple tab portions can be staggered between the first weld mark 31 and the explosion-proof valve 25.

[0130] By adopting the above technical solution, the electrode terminal 23 is eccentrically arranged outward, and the laser welding area and the ultrasonic welding area are staggered through the adapter 2212, which is beneficial to the arrangement of the tab 2211 and makes the staggered arrangement space of the tab 2211 more sufficient.

[0131] 6 , 8 , and 9 , in some embodiments, the first extension portion 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 connection portion 2311 and the second segment 2312b. The first weld mark 31 is located in the second segment 2312b. The second thickness H2 is greater than or equal to the first thickness H1.

[0132] When the second thickness H2 is greater than the first thickness H1, the first extension portion 2312 adopts a non-uniform thickness structure. Optionally, the first section 2312a and the second section 2312b are flush with each other on a surface close to the first wall 211, so that the first extension portion 2312 has a stepped shape, and the second section 2312b protrudes relative to the first section 2312a in a direction away from the first wall 211. In another embodiment, the second thickness H2 may be equal to the first thickness H1.

[0133] The laser welding area between the electrode terminal 23 and the adapter plate 2212 is at least located in the second section 2312b. By setting the thickness of the second section 2312b to be greater than or equal to the thickness of the first section 2312a, the second section 2312b can meet the laser welding penetration requirement.

[0134] In some embodiments, a 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, that is, 1≤H2 / H1≤3.

[0135] The outer shell 21 of the battery cell 20 may include a housing and an end cap. The first wall 211 on which the electrode terminal 23 is mounted serves as the end cap. During assembly of the battery cell 20, the end cap is secured to the housing, with a sealing ring positioned between the two. If the ratio of the second thickness H2 to the first thickness H1 is less than 1, insufficient laser penetration will result. If the ratio is greater than 3, the second section 2312b may occupy excessive space, and the sealing ring may not provide a good seal.

[0136] 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, so that the sealing performance of the battery cell 20 is better.

[0137] In some embodiments, the adapter sheet 2212 has a third thickness H3, and a ratio of the second thickness H2 to the third thickness is greater than or equal to 1 and less than or equal to 3, that is, 1≤H2 / H3≤3.

[0138] The thickness of the second section 2312b can be greater than or equal to the thickness of the adapter plate 2212. The thickness of the adapter plate 2212 does not need to be set too thick to avoid occupying too much space, and the thickness of the second section 2312b must meet the requirements of welding penetration; if the ratio of the second thickness H2 to the third thickness H3 is greater than 3, the second section 2312b may occupy too much space.

[0139] By adopting the above technical solution, the electrode terminal 23 can meet the requirement of the melting depth without occupying too much space in the battery cell 20.

[0140] As shown in FIG. 9 , the adapter piece 2212 is stepped, and the adapter piece 2212 is connected to both the first section 2312 a and the second section 2312 b .

[0141] The adapter plate 2212 is a stepped sheet structure, with one end of the adapter plate 2212 being attached to the second section 2312 b and the other end being attached to the first section 2312 a and the tab 2211 (not shown in FIG9 ).

[0142] By adopting the above technical solution, the shape of the adapter 2212 is adapted to the shape of the electrode terminal 23 to meet welding requirements.

[0143] 3 to 9 , in some embodiments, a battery cell 20 includes a housing 21 , an electrode assembly 22 , and an electrode terminal 23 . The electrode assembly 22 is provided with an electrode connector 221 , which includes a tab 2211 and a transition piece 2212 . The electrode terminal 23 includes a body 231 and a post 232 protruding from one side of the body 231 . The post 232 is inserted into the electrode lead-out hole 212 . The body 231 has a first side surface 231 a and a second side surface 231 b that are oppositely disposed along the length direction of the first wall 211 . The first side 231a is located near the outside of the housing 21, and the second side 231b is located near the center of the housing 21. The distance between the first side 231a and the terminal post 232 is greater than the distance between the second side 231b and the terminal post 232. The center-to-center distance W1 between the two tabs 2211 is less than the center-to-center distance W3 between the two terminal posts 232. The adapter 2212 is pre-welded to the tab 2211 to form a second weld mark 32. The adapter 2212 is welded to the body 231 to form a first weld mark 31. The second weld mark 32 is closer to the center of the housing 21 than the first weld mark 31. The battery cell 20 provided in this embodiment provides a larger misalignment space for the tab 2211 and optimizes the arrangement space of the battery cell 20.

[0144] 10 to 12 , other embodiments of the present application provide a battery cell 20, comprising a housing 21, an electrode assembly 22, and an electrode terminal 23. An electrode lead-out hole 212 is provided on a first wall 211 of the housing 21. The electrode assembly 22 is disposed in the housing 21. An electrode connector 221 is provided on the electrode assembly 22. A pole 232 is disposed on the first wall 211 of the housing 21. The electrode terminal 23 comprises a body 231 and a pole 232 protruding from one side of the body 231. The pole 232 passes through the electrode lead-out hole 212. The body 231 is disposed in 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 opposite to each other along a first direction. The distance between the first side surface 231a and the pole 232 is greater than the distance between the second side surface 231b and the pole 232. In this embodiment, the first side 231a is the side of the body 231 close to the middle of the shell 21, and the second side 231b is the side of the body 231 close to the edge of the shell 21, that is, the body 231 is offset toward the inside of the shell 21 relative to the pole 232.

[0145] In some embodiments, as shown in FIG. 10 to FIG. 12 , 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 .

[0146] By adopting the above technical solution, the main body 231 leaves an avoidance space on the side close to the edge of the shell 21, reducing the space occupied by the electrode terminal 23 in the edge area of ​​the battery cell 20. The space between the main body 231 and the edge of the shell 21 can be conveniently arranged with other components, such as moldings, etc., and can also optimize the arrangement space of the components in the battery cell 20.

[0147] Please refer to Figures 11, 13 and 14. In some embodiments, the main body 231 has a third side surface 231c and a fourth side surface 231d arranged opposite to each other along a second direction, where the second direction is the width direction (Y direction) of the first wall 211; the distance between the third side surface 231c and the pole 232 is greater than the distance between the fourth side surface 231d and the pole 232.

[0148] The center of the pole 232 can be located on the centerline of the width direction of the first wall 211. The distance between the third side 231c and the pole 232 is greater than the distance between the fourth side 231d and the pole 232. That is, the distance between the third side 231c and the centerline of the width direction of the first wall 211 is greater than the distance between the fourth side 231d and the centerline of the width direction of the first wall 211. In this way, the body 231 is offset relative to the pole 232 along the width direction of the first wall 211, and the weld mark between the tab 2211 and the body 231 can also be offset relative to the width centerline of the first wall 211, facilitating contact and welding between the tab 2211 and the body 231.

[0149] By adopting the above technical solution, the main body 231 is offset relative to the pole 232 along the length direction of the first wall 211. At the same time, the main body 231 is also offset relative to the pole 232 along the width direction of the first wall 211, which facilitates welding the pole tab 2211 to the electrode terminal 23, reduces the redundancy of the pole tab 2211, and further reduces the space occupied by the pole tab 2211, which is beneficial to improving the energy density of the battery.

[0150] Please refer to Figures 10 to 16. In some embodiments, the main body 231 includes a pole connecting portion 2311 and a first extension portion 2312. The pole connecting portion 2311 and the pole 232 are correspondingly arranged along the thickness direction (Z direction) of the first wall 211. The first extension portion 2312 extends from the pole connecting portion 2311 along the first direction toward the middle of the shell 21, and the first side surface 231a is provided on the first extension portion 2312; the electrode connector 221 is a pole ear 2211; the first extension portion 2312 extends toward the center line direction close to the shell 21, and the first extension portion 2312 is welded to the pole ear 2211 to form a first weld mark 31.

[0151] The solution provided in this embodiment eliminates the adapter plate 2212 and directly welds the electrode terminal 23 to the tab 2211 . Specifically, the first extension portion 2312 in the electrode terminal 23 is welded to the tab 2211 to form a first weld mark 31 , which can be a laser weld mark.

[0152] Among them, the center distance W1 of the two pole ears 2211 is smaller than the center distance W3 of the two pole posts 232. Since the first extension portion 2312 extends toward the center line direction of the shell 21, that is, extends toward the middle of the shell 21, it is convenient for the pole ear 2211 to be directly welded to the first extension portion 2312, and the pole ear 2211 can obtain a larger staggered arrangement space, which is conducive to the arrangement of the size of the pole ear 2211.

[0153] 10 , 13 and 14 , in some embodiments, the tab 2211 includes a plurality of stacked tab portions, which are welded together to form a second weld mark 32 , and the projection of the second weld mark 32 toward the electrode terminal 23 falls completely within the body 231 .

[0154] Specifically, the plurality of tabs are pre-welded using ultrasonic welding, and then the pre-welded tabs 2211 are laser welded to the body 231, forming a second weld mark 32. The projection of the second weld mark 32 toward the electrode terminal 23 falls completely 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. 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.

[0155] By adopting the above technical solution, the tab 2211 can be arranged corresponding to the first body 231 to facilitate welding, and can also prevent the laser welding head from directly pressing on the tab 2211 during laser welding and crushing or fracturing the tab 2211.

[0156] Please refer to Figures 13 and 14. In 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 weld mark 32 is offset inward relative to the main body 231, that is, the second weld mark 32 is offset in a direction close to the length center of the first wall 211, and the distance between the inner edge of the second weld mark 32 and the inner edge of the main body 231 is a first distance D1, and D1 is greater than or equal to 1 mm; along the width direction of the first wall 211, the second weld mark 32 is offset downward relative to the main body 231, that is, the second weld mark 32 is offset in a direction away from the width center of the first wall 211, and the distance between the lower edge of the second weld mark 32 and the lower edge of the main body 231 is a second distance D2, and D2 is greater than or equal to 1 mm.

[0157] Among them, the edge of the second weld mark 32 can be a straight line, a curve, an arc, etc., and along the length direction of the first wall 211, the distance between the inner edge of the second weld mark 32 and the edge corresponding to the pole 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 weld mark 32 and the edge corresponding to the pole 232 can be greater than or equal to 1 mm.

[0158] Optionally, both the first distance D1 and the second distance D2 are less than 2 mm. The larger the first distance D1, the further outward the tab 2211 is, and the smaller the space left for the tab 2211 to be misaligned. The larger the second distance D2, the higher the tab 2211 is, and increasing the height of the tab 2211 increases the cost.

[0159] By adopting the above technical solution, the tabs 2211 can be staggered in the interior of the battery cell 20 , and the second weld mark 32 completely falls within the range of the electrode terminal 23 , thereby improving the welding quality.

[0160] Referring to Figure 14, in some embodiments, the first direction is the length direction of the first wall 211; the projection of the first weld mark 31 on the body 231 falls within the projection of the second weld 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 weld mark 31 and the second weld mark 32; along the length direction of the first wall 211, there is a fourth distance D4 between the opposite edges of the first weld mark 31 and the second weld mark 32; the third distance D3 and the fourth distance D4 are both greater than 0 and less than 2 times the width W6 of the first weld mark 31.

[0161] Specifically, along the width direction (Y direction) of the first wall 211, there is a third distance D3 between the edges of the first weld mark 31 and the second weld mark 32 that are opposite to each other; along the length direction (X direction) of the first wall 211, there is a fourth distance D4 between the edges of the first weld mark 31 and the second weld mark 32 that are opposite to each other; wherein,

[0162] 0<D3≤2W6, and 0<D4≤2W6.

[0163] By adopting the above technical solution, the projection of the first weld mark 31 on the electrode terminal 23 falls within the projection of the second weld mark 32 on the electrode terminal 23 , which can improve the welding reliability between the tab 2211 and the body 231 .

[0164] 15 and 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.

[0165] After laser welding the tabs 2211, the tabs 2211 and the body 231 must be laser welded together. The ratio of the thickness of the body 231 to the thickness of the tabs 2211 is greater than or equal to 3. This ensures that the thickness of the first body 231 exceeds the laser welding penetration, making it difficult to penetrate the body 231 during welding. Optionally, the thickness of the body 231 can be, but is not limited to, 2 mm. If the body 231 is too thick, it will occupy the internal space of the battery cell 20.

[0166] In some embodiments, the penetration of the first weld mark 31 on the body 231 is less than or equal to the thickness of the body 231 .

[0167] The penetration depth of the first weld mark 31 on the body 231 is less than or equal to the thickness H4 of the body 231 , which can prevent the body 231 from being penetrated during laser welding.

[0168] In some embodiments, the penetration of the first weld mark 31 on the body 231 is less than or equal to half the thickness H4 of the body 231. By adopting the above technical solution, the effect of welding heat on the compression of the sealing ring can be reduced.

[0169] In some embodiments, a liquid injection hole 213 and an explosion-proof valve mounting hole 214 are further provided on the first wall 211 of the shell 21, and a liquid injection hole baffle 24 for sealing the liquid 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 liquid injection hole 213 and the explosion-proof valve 25 are arranged at intervals between the two electrode lead-out holes 212; the main body 231 has a first height H5 on the inner surface of the first wall 211, and the liquid injection hole baffle 24 has a second height H6 on the inner surface of the first wall 211; wherein the first height H5 is equal to or different from the second height H6.

[0170] Optionally, the first height H5 and the second height H6 are equal, that is, the main body 231 and the liquid injection hole baffle 24 are arranged at the same height on the first wall 211, and the liquid injection hole baffle 24 will not abut against the pole ear 2211; optionally, the first height H5 and the second height H6 may also be different, 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.

[0171] By adopting the above technical solution, the adapter plate is eliminated from the battery cell 20, solving the problem in the prior art that the adapter plate needs to avoid the injection hole baffle 24. The height of the injection hole baffle 24 and the body 231 can be flexibly set.

[0172] In some embodiments, the second height H6 is less than the first height H5.

[0173] 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 tab 2211 is welded to the body 231, the injection hole baffle 24 is unlikely to interfere with the tab 2211.

[0174] 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 tape attached to the tab 2211 is less than the third height H7.

[0175] Specifically, the thickness of the tab 2211 is set to H8, and the thickness of the adhesive tape attached to the tab 2211 is generally 0.15 mm. 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:

[0176] H6+H8+0.15<H7.

[0177] It is understood that the thickness of the adhesive tape can be adjusted, and the above conditions should be adjusted accordingly.

[0178] By adopting the above technical solution, the height of the injection hole baffle 24 on the inner surface of the first wall 211 can be greater than the height of the main body 231 on the inner surface of the first wall 211. By meeting the above conditions, the probability of the electrode tab 2211 being lifted up by the injection hole baffle 24 and inserted into the electrode piece can be reduced.

[0179] 3 and 10 , in some embodiments, the tab 2211 has a misalignment space within the battery cell 20 , and the length W4 of the misalignment space is greater than or equal to 8 mm.

[0180] The tab 2211 includes multiple stacked tab portions, which 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. Due to the offset arrangement of the electrode terminal 23 in the battery cell 20 provided in the embodiment of the present application, it can optimize the arrangement space of the components and facilitate the staggered arrangement of the tabs 2211, so that the misalignment space length of the tabs 2211 can reach more than 8 mm.

[0181] Optionally, the length of the offset space is greater than or less than 12 mm.

[0182] By adopting the above technical solution, the battery cell 20 provided in this embodiment can allow multiple tabs to be staggered within a larger staggered space. Referring to Figures 10 to 16, the embodiment of the present application provides a battery cell 20, including a housing 21, an electrode assembly 22, and an electrode terminal 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 pole 232 protruding from one side of the body 231. The body 231 has a first side surface 231a and a second side surface 231b arranged opposite to each other along the length direction of the first wall 211. The first side surface 231a is provided on a side of the body 231 close to the edge of the housing 21. The distance between the first side surface 231a and the pole 232 is greater than the distance between the second side surface 231b and the pole 232, that is, the body 231 is offset outward relative to the pole 232. The body 231 includes a terminal connecting portion 2311 and a first extension portion 2312. The first extension portion 2312 is welded to the tab 2211 to form a first weld mark 31. A second weld mark 32 is formed on the tab 2211, and the projection of the second weld mark 32 toward the electrode terminal 23 falls completely within the body 231. The battery cell 20 provided in this embodiment provides a large misalignment space for the tab 2211 and optimizes the arrangement space of the battery cell 20.

[0183] In other embodiments, the body 231 has a first side surface 231a and a second side surface 231b arranged opposite to each other along a first direction, and the distance between the first side surface 231a and the pole 232 is greater than the distance between the second side surface 231b and the pole 232, wherein the first direction is the width direction of the body 231.

[0184] By adopting the above technical solution, the main body 231 is offset relative to the pole 232 in the width direction of the first wall 211, and one end of the main body 231 can provide a certain avoidance space for the components in the battery cell 20, thereby optimizing the arrangement space of the components in the battery cell 20; and the main body 231 can be offset toward the side where the electrode connector 221 is located, which facilitates the welding of the electrode connector 221 and the main body 231, reduces the redundancy and occupied space of the electrode connector 221, and is beneficial to improving the energy density of the battery cell 20.

[0185] A second aspect of the present application provides a battery 100 , comprising the battery cell 20 provided in the first aspect.

[0186] A third aspect of the present application provides an electrical device, comprising the battery 100 provided in the second aspect, wherein the battery 100 is used to provide electrical energy to the electrical device.

[0187] The power-consuming device may be any of the aforementioned devices or systems using batteries.

[0188] It should be noted that, unless there is any conflict, the features in the embodiments of this application can be combined with each other.

[0189] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present application, and should all be included in the scope of protection of the present application.

Claims

1. A battery cell, characterized in that: include: A shell, wherein a first wall of the shell is provided with an electrode lead-out hole; An electrode assembly is disposed in the housing, and an electrode connector is disposed on the electrode assembly; The electrode terminal comprises a body and a pole protruding from one side of the body, the pole is inserted into the electrode lead-out hole, the body is arranged in the housing and is electrically connected to the electrode connector; The body has a first side surface and a second side surface which are arranged opposite to each other along a first direction, and a distance between the first side surface and the pole is greater than a distance between the second side surface and the pole.

2. The battery cell according to claim 1, characterized in that: The body includes a pole connecting portion and a first extending portion, wherein the pole connecting portion is arranged corresponding to the pole along the thickness direction of the first wall, and the first extending portion extends from the pole connecting portion along the first direction, and the first direction is the length direction of the first wall; A first weld mark is formed between the body and the electrode connector, and the first weld mark is at least partially located on the first extension portion.

3. The battery cell according to claim 2, characterized in that: The body has a third side surface and a fourth side surface which are arranged opposite to each other along a second direction, and the second direction is a width direction of the first wall; The distance between the third side surface and the pole is greater than the distance between the fourth side surface and the pole.

4. The battery cell according to claim 2 or 3, characterized in that: The electrode lead-out hole, the electrode connector and the electrode terminal are respectively provided with two, and the electrode connector includes a tab; Wherein, the center distance between the two pole ears is smaller than the center distance between the two poles.

5. The battery cell according to any one of claims 2 to 4, characterized in that: The electrode connector includes a pole ear and a transfer plate, and the transfer plate is welded to the pole ear and the body respectively; The first extension portion extends in a direction away from the center line of the housing, and the first weld mark is formed between the first extension portion and the adapter sheet.

6. The battery cell according to claim 5, characterized in that: A second weld mark is formed between the pole ear and the adapter sheet, and the second weld mark is arranged on a side of the first weld mark close to the middle of the first wall.

7. The battery cell according to claim 5 or 6, characterized in that: The first extension portion includes a first section with a first thickness and a second section with a second thickness, the first section is arranged between the pole connecting portion and the second section, the first weld mark is located in the second section; the second thickness is greater than or equal to the first thickness.

8. The battery cell according to claim 7, characterized in that: A 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 according to claim 7 or 8, characterized in that: The adapter sheet has a third thickness, and a 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 according to any one of claims 7 to 9, characterized in that: The adapter piece is in a stepped shape and is connected to the first section and the second section at the same time.

11. The battery cell according to any one of claims 2 to 10, characterized in that: The first extension portion extends toward a direction close to the center line of the shell; the electrode connector is a pole ear, and the pole ear is at least welded to the first extension portion.

12. The battery cell according to claim 11, characterized in that: The electrode tab includes a plurality of electrode tab portions, the plurality of electrode tab portions are welded to form a second weld mark, and a projection of the second weld mark toward the electrode terminal completely falls within the body.

13. The battery cell according to claim 12, characterized in that: Along the length direction of the first wall, the second weld mark is offset inwardly relative to the body, and there is a first distance between the inner edge of the second weld mark and the inner edge of the body; Along the width direction of the first wall, the second weld mark is offset downward relative to the body, and a second distance exists between the lower edge of the second weld 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 according to claim 12 or 13, characterized in that: The projection of the first weld mark on the body falls within the projection of the second weld mark on the body; A third distance exists between an edge of the first weld print and an edge of the second weld print along a width direction of the first wall; Along the length direction of the first wall, there is a fourth distance between the edge of the first weld mark and the edge of the second weld mark; The third distance and the fourth distance are both greater than 0 and less than 2 times of the first weld width.

15. The battery cell according to any one of claims 4 to 14, 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 according to any one of claims 2 to 15, characterized in that: The penetration of the first weld mark on the body is less than or equal to the thickness of the body.

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

18. The battery cell according to any one of claims 4 to 17, characterized in that: The first wall of the housing is also provided with a liquid injection hole and an explosion-proof valve installation hole, and a liquid injection hole baffle for sealing the liquid injection hole and an explosion-proof valve penetrating the explosion-proof valve installation hole are installed on the first wall, and the liquid injection hole and the explosion-proof valve are spaced apart; The electrode terminal has 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 is equal to or different from the second height.

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

20. The battery cell according to claim 18 or 19, characterized in that: The explosion-proof valve has a third height on the inner surface of the first wall; 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 tape attached to the tab is less than the third height.

21. The battery cell according to any one of claims 1 to 20, characterized in that: The first direction is a width direction of the first wall.

22. The battery cell according to any one of claims 1 to 21, characterized in that: The electrode connector includes a pole ear, and the pole ear has a misalignment space in the battery cell, and the length of the misalignment space is greater than or equal to 8 mm.

23. A battery, characterized in that: Comprising the battery cell according to any one of claims 1 to 22.

24. An electrical device, characterized in that: The battery as claimed in claim 23 is used to provide electrical energy to the electrical device.

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