Battery cell and battery pack

Abstract

This application provides a battery cell and a battery pack, relating to the field of battery technology. In the battery cell, a connector is connected to the side of the current collector facing the end cover in a first direction. The terminal post has a connector groove and a mounting hole. The connector groove is positioned in the first direction facing the current collector. The connector passes through the connector groove. The mounting hole is located on the outer periphery of the connector groove and communicates with it. An elastic snap-fit ​​connector passes through the mounting hole and the connector groove, and is connected to the terminal post and snaps into the connector. In this way, by having the connector pass through the connector groove and the elastic snap-fit ​​connector snaps into the connector, the traditional welding process is replaced, eliminating the original bending structure of the current collector and freeing up the space occupied by the bending structure, thereby helping to improve the energy density of the battery cell. At the same time, since the connector passes through the connector groove, it helps to avoid the connector occupying additional internal space of the casing, further optimizing space utilization, thereby helping to further improve the energy density of the battery cell.

Description

Technical Field

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

[0002] The information disclosed in this background section is intended only to enhance the understanding of the general background of this disclosure and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art.

[0003] In a battery cell, the terminals and current collectors are usually electrically connected by welding. To provide space for welding operations, the current collectors usually have a bent structure. However, the bent structure occupies a lot of space, which is not conducive to the energy density of the battery cell. Summary of the Invention

[0004] In view of this, the purpose of this application is to provide a battery cell and a battery pack, which aims to solve the technical problem of how to improve the energy density of a battery cell.

[0005] To solve the above-mentioned technical problems, the technical solution adopted in this application is as follows: In a first aspect, embodiments of this application provide a battery cell having a first orientation. The battery cell includes: a housing; an electrode assembly located within the housing; an end cap connected to one end of the housing along the first orientation; a current collector located within the housing, the current collector being electrically connected to one end of the electrode assembly along the first orientation near the end cap; a connector connected to the current collector on one side of the current collector facing the end cap along the first orientation; a terminal post passing through the end cap, the terminal post having a insertion groove and a mounting hole, the insertion groove being disposed along the first orientation towards the current collector, the connector passing through the insertion groove, the mounting hole being located on the outer periphery of the insertion groove and communicating with the insertion groove; and an elastic snap-fit ​​member passing through the mounting hole and the insertion groove, the elastic snap-fit ​​member being connected to the terminal post and snap-fitted with the connector.

[0006] In some embodiments of the first aspect, the battery cell further has a second direction perpendicular to the first direction, the elastic snap-fit ​​member includes a fixing part, an elastic part and a snap-fit ​​part, the fixing part and the elastic part are both located in the mounting hole, the snap-fit ​​part passes through the insertion groove and the mounting hole, the elastic part is connected between the fixing part and the snap-fit ​​part along the second direction, the fixing part is connected to the terminal post, and the snap-fit ​​part snaps into the insertion member.

[0007] In some embodiments of the first aspect, the battery cell further includes a limiting member connected to the terminal post, and the snap-fit ​​portion has a limiting groove at one end near the plug-in member along the second direction, the limiting member being located in the mounting hole and passing through the limiting groove.

[0008] In some embodiments of the first aspect, the snap-fit ​​portion has a guide ramp at one end near the plug-in along the second direction, the guide ramp being inclined relative to the first direction.

[0009] In some embodiments of the first aspect, the connector includes a first connector portion and a second connector portion, the first connector portion being connected between the manifold and the second connector portion along the first direction, the second connector portion having a larger dimension along the second direction than the first connector portion along the second direction, and the second connector portion being located on the side of the snap-fit ​​portion facing away from the manifold along the first direction.

[0010] In some embodiments of the first aspect, the insertion slot has a first curved surface, and the second insertion portion includes a second curved surface adapted to the first curved surface, the second curved surface abutting against the first curved surface.

[0011] In some embodiments of the first aspect, at least one of the first plug portion and the second plug portion is provided with a weight reduction hole.

[0012] In some embodiments of the first aspect, the number of resilient snap-fit ​​members and the number of mounting holes are both multiple, the multiple mounting holes are arranged at intervals along the circumference of the plug member, the multiple resilient snap-fit ​​members are arranged at intervals along the circumference of the plug member, and each resilient snap-fit ​​member corresponds to one mounting hole.

[0013] In some embodiments of the first aspect, the battery cell further includes a roughening layer connected to one side of the current collector facing the terminal post along the first direction, the roughening layer being located on the outer periphery of the connector and abutting against the terminal post.

[0014] Secondly, embodiments of this application provide a battery pack including the battery cells described in any of the embodiments of the first aspect above.

[0015] The beneficial effects of this application are as follows: In the battery cell provided in this application, a connector is connected to the side of the current collector facing the end cover in a first direction. The terminal post has a connector groove and a mounting hole. The connector groove is positioned in the first direction facing the current collector. The connector passes through the connector groove. The mounting hole is located on the outer periphery of the connector groove and communicates with it. An elastic snap-fit ​​connector passes through the mounting hole and the connector groove. The elastic snap-fit ​​connector is connected to the terminal post and snaps into the connector. In this way, by having the connector pass through the connector groove and the elastic snap-fit ​​connector snaps into the connector, the traditional welding process is replaced, and an electrical connection between the current collector and the terminal post is achieved. This eliminates the original bending structure of the current collector, freeing up the space occupied by the bending structure, thereby helping to improve the energy density of the battery cell. At the same time, since the connector passes through the connector groove, it helps to avoid the connector occupying additional internal space of the casing, further optimizing space utilization, thereby helping to further improve the energy density of the battery cell. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 An exploded view of the battery cell in an embodiment of this application is shown; Figure 2 It shows when Figure 1 A three-dimensional structural diagram showing the concealed housing, electrode assembly, current collector, roughening layer, and connectors; Figure 3 It shows Figure 2 A three-dimensional sectional view of the structure; Figure 4 It shows Figure 1 A three-dimensional structural diagram of the central flow plate, roughening layer, and connector; Figure 5 It shows Figure 4 A schematic diagram of the planar sectional structure; Figure 6 It shows when Figure 2 and Figure 4 A schematic diagram of the sectional view of the structure during assembly; Figure 7 It shows Figure 6 A magnified structural diagram of region A in the middle.

[0018] Explanation of key component symbols: 100-Battery cell; 110-Housing; 120-Electrode assembly; 130-End cap; 140-Current collector; 150-Connector; 151-First connector; 152-Second connector; 1521-Second curved surface; 153-Weight reduction hole; 160-Terminal post; 161-Connection slot; 1611-First curved surface; 162-Mounting hole; 170-Elastic snap-fit; 171-Fixing part; 172-Elastic part; 173-Snap-fit ​​part; 1731-Limiting groove; 1732-Guide slope; 180-Rough layer; 191-Limiting element; Z-First direction; X-Second direction. Detailed Implementation

[0019] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0020] In the description of this application, the terms "center", "longitudinal", "lateral", "length", "width", "height", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0021] Furthermore, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that they are in indirect contact through an intermediate medium. Moreover, "above" or "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below" or "below" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0022] In the description of this application, the terms "first," "second," etc., are used to distinguish different objects and should not be construed as indicating or implying a specific order or hierarchy, or implicitly specifying the number of technical features indicated. Therefore, a feature marked "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, the term "multiple" means two or more, unless otherwise explicitly defined.

[0023] In the description of this application, unless otherwise explicitly specified, the term "connection" should be interpreted broadly. For example, it can refer to a non-detachable connection, a detachable connection, or a single-piece structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0024] In the description of this application, the term "and / or" can be understood to mean three possibilities. For example, A and / or B can represent: A alone; A and B simultaneously; and B alone. Additionally, the character " / " generally indicates an "or" relationship between the preceding and following objects.

[0025] In the description of this application, "parallel" includes not only the case of absolute parallelism, but also the case of approximate parallelism as commonly understood in engineering; similarly, "perpendicular" also includes not only the case of absolute perpendicularity, but also the case of approximate perpendicularity as commonly understood in engineering. For example, if the angle between two directions is 80° to 90°, the two directions can be considered perpendicular; if the angle between two directions is 0° to 10°, the two directions can be considered parallel.

[0026] like Figure 1 As shown, an embodiment of this application provides a battery cell 100, which relates to the field of battery technology and is mainly used in battery packs, so as to be indirectly applied to electrical devices and energy storage devices in the form of battery packs. Of course, the battery cell 100 can also be directly applied to electrical devices and energy storage devices without taking the form of a battery pack.

[0027] For example, electrical equipment can be vehicles, mobile phones, computers, ships, spacecraft, power tools, electric toys, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, new energy vehicles, etc., and new energy vehicles can be pure electric vehicles, hybrid electric vehicles, range-extended electric vehicles, etc.; spacecraft can be airplanes, rockets, drones, spacecraft, etc.; electric toys can be game consoles, electric car toys, electric ship toys, electric airplane toys, etc.; power tools can be metal cutting power tools, grinding power tools, assembly power tools, railway power tools, etc., specifically such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. Energy storage equipment can be energy storage containers, energy storage cabinets, energy storage power stations, wind power generation devices, solar power generation devices, mobile power devices, temporary power supply devices, etc.

[0028] It should be noted that the battery cell 100 mainly relies on the migration of metal ions between the positive and negative electrodes to function. The battery cell 100 can be rectangular, cylindrical, flat, or other shapes. Classified by packaging method, the battery cell 100 can be a square battery, a cylindrical battery, etc.; classified by the type of metal ions, the battery cell 100 can be a lithium-ion battery, a sodium-ion battery, etc.; classified by the physical state of the electrolyte, the battery cell 100 can be a liquid battery, i.e., using a liquid electrolyte (electrolyte); of course, the battery cell 100 can also be a solid-state battery or a semi-solid-state battery, i.e., the electrolyte is at least partially solid-state, with common materials such as sulfide, oxide, or polymer electrolytes. The solid-state electrolyte can replace the liquid electrolyte and the separator layer between the positive and negative electrodes, providing both ion conduction and isolation functions.

[0029] like Figures 1 to 6 As shown, the battery cell 100 provided in this embodiment has a first direction Z. The battery cell 100 includes: a housing 110, an electrode assembly 120, an end cap 130, a current collector 140, a connector 150, a terminal post 160, and a flexible snap-fit ​​connector 170.

[0030] The electrode assembly 120 is located inside the housing 110; the end cap 130 is connected to one end of the housing 110 along the first direction Z; the collector plate 140 is located inside the housing 110 and is electrically connected to the end of the electrode assembly 120 along the first direction Z near the end cap 130; the connector 150 is connected to the side of the collector plate 140 along the first direction Z facing the end cap 130; the pole post 160 passes through the end cap 130 and has a insertion groove 161 and a mounting hole 162. The insertion groove 161 is arranged along the first direction Z facing the collector plate 140, and the connector 150 passes through the insertion groove 161. The mounting hole 162 is located on the outer periphery of the insertion groove 161 and communicates with the insertion groove 161; the elastic snap-fit ​​member 170 passes through the mounting hole 162 and the insertion groove 161, and is connected to the pole post 160 and snap-fitted with the connector 150.

[0031] It is understood that in the battery cell 100 provided in this embodiment, the connector 150 is connected to the side of the current collector 140 facing the end cover 130 in the first direction Z. The terminal post 160 is provided with a connector groove 161 and a mounting hole 162. The connector groove 161 is provided in the first direction Z facing the current collector 140. The connector 150 passes through the connector groove 161. The mounting hole 162 is located on the outer periphery of the connector 150 and communicates with the connector groove 161. The elastic snap-fit ​​member 170 passes through the mounting hole 162 and the connector groove 161. The elastic snap-fit ​​member 170 is connected to the terminal post 160 and snaps into the connector 150.

[0032] In this way, the connector 150 is inserted into the connector slot 161, and the elastic snap-fit ​​connector 170 snaps into the connector 150, replacing the traditional welding process and realizing the electrical connection between the current collector 140 and the terminal post 160. This eliminates the original bending structure of the current collector 140, freeing up the space occupied by the bending structure, thereby helping to improve the energy density of the battery cell 100.

[0033] Meanwhile, since the connector 150 passes through the connector slot 161, it helps to avoid the connector 150 occupying additional internal space of the housing 110, further optimizing space utilization, thereby helping to further improve the energy density of the battery cell 100.

[0034] For example, the material of the end cap 130 / the material of the housing 110 can be aluminum, aluminum alloy, copper, steel, plastic, titanium, etc., without specific limitations.

[0035] It should be noted that when terminal 160 is the positive terminal, current collector 140 is the positive current collector; when terminal 160 is the negative terminal, current collector 140 is the negative current collector. The material of the positive terminal / positive current collector can be aluminum, aluminum alloy, etc.; the material of the negative terminal can be copper, copper alloy, copper-aluminum composite material, etc.; and the material of the negative current collector can be copper, copper alloy, etc.

[0036] For example, the electrode assembly 120 may include a positive electrode sheet, a negative electrode sheet, and an insulating layer and is manufactured using a winding process or a stacking process. The insulating layer is disposed between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet includes a positive current collector and a positive active material layer, with the positive active material layer coated on the positive current collector. The negative electrode sheet includes a negative current collector and a negative active material layer, with the negative active material layer coated on the negative current collector.

[0037] The electrode body consists of a positive active material layer, a portion of the positive current collector coated with the positive active material layer, a negative active material layer, and a portion of the negative current collector coated with the negative active material layer. The portion of the positive current collector not coated with the positive active material layer is the positive tab, and the portion of the negative current collector not coated with the negative active material layer is the negative tab. The electrode body is located between the positive tab and the negative tab along the first direction Z.

[0038] It should be noted that when the terminal post 160 is the positive terminal post and the current collector 140 is the positive current collector, the positive tab is electrically connected to the positive current collector to serve as the positive terminal when the battery cell 100 is connected to the external circuit, and the negative tab is electrically connected to the housing 110 to serve as the negative terminal when the battery cell 100 is connected to the external circuit. The positive terminal post and the end cap 130 are insulated to help avoid short circuit between the positive and negative terminals. When the terminal post 160 is the negative terminal post and the current collector 140 is the negative current collector, the negative tab is electrically connected to the negative current collector to serve as the negative terminal when the battery cell 100 is connected to the external circuit, and the positive tab is electrically connected to the housing 110 to serve as the positive terminal when the battery cell 100 is connected to the external circuit. The negative terminal post and the end cap 130 are insulated to help avoid short circuit between the positive and negative terminals.

[0039] For example, the material of the separator layer can be polypropylene, polyethylene, etc.; taking lithium ions as an example, the material of the positive electrode current collector can be aluminum, and the material of the positive electrode active material layer can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, lithium manganese oxide, etc.; the material of the negative electrode current collector can be copper, and the negative electrode active material can be graphite, silicon, etc., without making specific limitations on the above materials.

[0040] It should be noted that the pole post 160 can be insulated from the end cap 130 by an insulating component, that is, the insulating component is located between the end cap 130 and the pole post 160. For example, the insulating component can be made of the following materials: 1. Synthetic organic insulating materials: plastics (e.g., polyethylene, polyvinyl chloride, polypropylene, polytetrafluoroethylene, epoxy resin, etc.), synthetic rubbers (e.g., silicone rubber, nitrile rubber, etc.), synthetic fibers (e.g., polyester fiber, nylon, etc.); 2. Natural organic insulating materials: wood, natural rubber, etc.; 3. Inorganic insulating materials: ceramics, glass, mica, quartz, asbestos, etc.; 4. Polymer insulating materials: polycarbonate, polyimide, etc.

[0041] like Figure 6 and Figure 7 As shown, in some embodiments, the battery cell 100 also has a second direction X perpendicular to the first direction Z. The elastic snap-fit ​​member 170 includes a fixing part 171, an elastic part 172 and a snap-fit ​​part 173. The fixing part 171 and the elastic part 172 are both located in the mounting hole 162. The snap-fit ​​part 173 passes through the insertion groove 161 and the mounting hole 162. The elastic part 172 is connected between the fixing part 171 and the snap-fit ​​part 173 along the second direction X. The fixing part 171 is connected to the terminal post 160, and the snap-fit ​​part 173 is snapped into the insertion member 150.

[0042] Understandably, when the connector 150 is inserted into the connector slot 161, the locking part 173 uses the elastic force generated by the elastic part 172 to lock the connector 150, thereby preventing the connector 150 from coming out of the connector slot 161.

[0043] It should be noted that, in the above embodiment, the fixing part 171 is also omitted, and the end of the elastic part 172 away from the snap-fit ​​part 173 is directly connected to the pole post 160, which can also achieve the snap-fit ​​effect.

[0044] For example, the materials of the fixing part 171, the elastic part 172, and the snap-fit ​​part can be aluminum, copper, nickel, aluminum alloy, copper alloy, nickel alloy, etc. In this case, the plug-in part 150 can be electrically connected to the pole post 160 through the fixing part 171, the elastic part 172, and the fixing part 171. Among them, the elastic part 172 can be a spring or a spring sheet, and the snap-fit ​​part 173 can be a wedge block or a ball.

[0045] It should be noted that when the battery cell 100 is a cylindrical battery, the first direction Z is the axial direction (axis direction) of the cylindrical battery, and the second direction X is the radial direction (diameter direction) of the cylindrical battery.

[0046] like Figure 1 , Figure 6 and Figure 7 As shown, the battery cell 100 further includes a limiting member 191 connected to the terminal post 160. The snap-fit ​​portion 173 is provided with a limiting groove 1731 at one end near the plug-in member 150 along the second direction X. The limiting member 191 is located in the mounting hole 162 and passes through the limiting groove 1731.

[0047] Understandably, the cooperation between the limiting member 191 and the limiting groove 1731 can limit the travel of the locking part 173, thereby helping to improve assembly consistency. At the same time, it can absorb the thermal expansion and contraction stress generated during the charging and discharging of the battery cell 100, as well as the vibration stress under vibration conditions, to achieve locking and hard limiting.

[0048] like Figure 6 and Figure 7 As shown, the snap-fit ​​portion 173 further has a guide slope 1732 at one end near the plug-in member 150 along the second direction X, and the guide slope 1732 is inclined relative to the first direction Z.

[0049] Understandably, by setting the guide ramp 1732, a guiding function can be provided for the connector 150 to guide the connector 150 to pass more smoothly into the connector slot 161, which helps to reduce assembly difficulty and improve assembly efficiency.

[0050] like Figure 6 and Figure 7As shown, the connector 150 further includes a first connector 151 and a second connector 152. The first connector 151 is connected between the collector 140 and the second connector 152 along the first direction Z. The second connector 152 is larger in size along the second direction X than the first connector 151 along the second direction X. The second connector 152 is located on the side of the snap-fit ​​portion 173 facing away from the collector 140 along the first direction Z.

[0051] Understandably, since the second plug portion 152 is located on the side of the snap-fit ​​portion 173 facing away from the current collector 140 along the first direction Z, and the size of the second plug portion 152 along the second direction X is larger than the size of the first plug portion 151 along the second direction X, the plug 150 presents an inverted shape that is wider at the top and narrower at the bottom, which facilitates its cooperation with the snap-fit ​​portion 173, thereby achieving snap-fit ​​and preventing the plug 150 from coming out of the plug slot 161, thus improving the reliability of the electrical connection.

[0052] like Figure 3 , Figure 5 and Figure 6 As shown, the insertion slot 161 further has a first curved surface 1611, and the second insertion part 152 includes a second curved surface 1521 adapted to the first curved surface 1611, the second curved surface 1521 abutting against the first curved surface 1611.

[0053] It is understandable that by setting the first curved surface 1611 and the second curved surface 1521, the effective contact area between the connector 150 and the pole post 160 can be increased, thereby improving the reliability of the electrical connection.

[0054] like Figure 4 and Figure 5 As shown, at least one of the first plug-in portion 151 and the second plug-in portion 152 is provided with a weight-reducing hole 153, which can reduce the weight of the plug-in 150, thereby helping to improve the energy density of the battery cell 100, and at the same time reducing the amount of material used in the plug-in 150 and reducing material costs.

[0055] It should be noted that when both the first plug-in portion 151 and the second plug-in portion 152 are provided with weight-reducing holes 153, the weight-reducing holes 153 penetrate through the first plug-in portion 151 and the second plug-in portion 152 along the first direction Z, and the weight-reducing holes 153 are connected to the plug-in groove 161.

[0056] In other embodiments, the elastic snap-fit ​​member 170 can also be an elastic buckle, which uses its own elastic deformation to snap into the connector 150. The elastic buckle can be made of plastic or metal. When the elastic buckle is made of plastic, the electrical connection between the terminal 160 and the collector 140 is achieved by the connector 150 contacting the terminal 160; when the elastic buckle is made of metal, the electrical connection between the terminal 160 and the collector 140 is achieved by the connector 150 contacting the terminal 160, and by the elastic buckle contacting the connector 150.

[0057] like Figure 3 As shown, in some embodiments, there are multiple elastic snap-fit ​​members 170 and multiple mounting holes 162. Multiple mounting holes 162 are arranged at intervals along the circumference of the plug-in member 150, and multiple elastic snap-fit ​​members 170 are arranged at intervals along the circumference of the plug-in member 150. Each elastic snap-fit ​​member 170 corresponds to one mounting hole 162.

[0058] Understandably, by setting multiple flexible snap-fit ​​pieces 170, which snap into the connector 150 at different positions, the force on the connector 150 can be more balanced, and there are more snap-fit ​​points, which helps to improve the stability and reliability of the electrical connection between the connector 150 and the pole post 160.

[0059] It should be noted that when the battery cell 100 has a second direction X, at least some of the multiple resilient snap-fit ​​members 170 are arranged opposite each other along the second direction X.

[0060] like Figure 1 , Figure 4 and Figure 6 As shown, in some embodiments, the battery cell 100 further includes a roughening layer 180, which is connected to the side of the current collector 140 facing the terminal post 160 in the first direction Z, and the roughening layer 180 abuts against the terminal post 160.

[0061] It is understandable that by setting the rough layer 180, the friction between the pole post 160 and the collector plate 140 can be increased, the torsional resistance of the collector plate 140 can be improved, thereby improving the stability of the electrical connection.

[0062] For example, the rough layer 180 may be a frosted layer (consisting of dense grooves), a matte layer (consisting of dense protrusions), etc., without specific limitations.

[0063] It should be noted that when the connector 150 includes a first connector portion 151 and a second connector portion 152, the rough layer 180 is located on the outer periphery of the first connector portion 151.

[0064] In summary, when the connector 150 passes through the connector slot 161 and the elastic snap-fit ​​connector 170 is made of metal and snaps into the connector 150, the electrical connection between the pole post 160 and the collector plate 140 is achieved in the following ways: First, the second curved surface 1521 abuts against the first curved surface 1611; second, the elastic snap-fit ​​connector 170 is connected to the pole post 160 and snaps into the connector 150; third, the collector plate 140 and the pole post 160 abut against the end face of the electrode assembly 120 along the first direction Z.

[0065] Embodiments of this application also provide a battery pack, including the battery cell 100 in any of the above embodiments.

[0066] It is understood that since the battery pack provided in this embodiment includes the battery cell 100 in any of the above embodiments, it has all the beneficial effects of the battery cell 100, which will not be described in detail here.

[0067] In the description of this application, the terms "some embodiments," "one embodiment," "example," "specific example," "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In the description of this application, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0068] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A battery cell having a first orientation (Z), characterized in that, The battery cell includes: Casing (110); An electrode assembly (120) is located within the housing (110); End cap (130) is attached to one end of the housing (110) along the first direction (Z); A collector plate (140) is located inside the housing (110) and is electrically connected to one end of the electrode assembly (120) along the first direction (Z) near the end cap (130). A connector (150) is attached to the side of the manifold (140) facing the end cap (130) along the first direction (Z); A pole post (160) is inserted through the end cap (130). The pole post (160) is provided with a plug groove (161) and a mounting hole (162). The plug groove (161) is arranged towards the collector plate (140) along the first direction (Z). The plug-in member (150) is inserted through the plug groove (161). The mounting hole (162) is located on the outer periphery of the plug groove (161) and communicates with the plug groove (161). The elastic snap-fit ​​member (170) passes through the mounting hole (162) and the insertion slot (161), and the elastic snap-fit ​​member (170) is connected to the pole post (160) and snap-fitted with the insertion member (150).

2. The battery cell according to claim 1, characterized in that, The battery cell also has a second direction (X) perpendicular to the first direction (Z). The elastic snap-fit ​​member (170) includes a fixing part (171), an elastic part (172), and a snap-fit ​​part (173). The fixing part (171) and the elastic part (172) are both located in the mounting hole (162). The snap-fit ​​part (173) passes through the insertion groove (161) and the mounting hole (162). The elastic part (172) is connected between the fixing part (171) and the snap-fit ​​part (173) along the second direction (X). The fixing part (171) is connected to the pole post (160), and the snap-fit ​​part (173) is snapped into the insertion member (150).

3. The battery cell according to claim 2, characterized in that, The battery cell also includes a limiting member (191) connected to the terminal post (160). The snap-fit ​​portion (173) is provided with a limiting groove (1731) at one end near the plug-in member (150) along the second direction (X). The limiting member (191) is located in the mounting hole (162) and passes through the limiting groove (1731).

4. The battery cell according to claim 2, characterized in that, The snap-fit ​​portion (173) has a guide slope (1732) at one end near the plug (150) along the second direction (X), and the guide slope (1732) is inclined relative to the first direction (Z).

5. The battery cell according to claim 2, characterized in that, The connector (150) includes a first connector (151) and a second connector (152). The first connector (151) is connected between the collector (140) and the second connector (152) along the first direction (Z). The second connector (152) is larger in size along the second direction (X) than the first connector (151) along the second direction (X). The second connector (152) is located on the side of the snap-fit ​​part (173) facing away from the collector (140) along the first direction (Z).

6. The battery cell according to claim 5, characterized in that, The insertion slot (161) has a first curved surface (1611), and the second insertion part (152) includes a second curved surface (1521) adapted to the first curved surface (1611), and the second curved surface (1521) abuts against the first curved surface (1611).

7. The battery cell according to claim 5, characterized in that, At least one of the first plug-in portion (151) and the second plug-in portion (152) is provided with a weight reduction hole (153).

8. The battery cell according to any one of claims 1 to 7, characterized in that, The number of the elastic snap-fit ​​members (170) and the number of the mounting holes (162) are both multiple. The multiple mounting holes (162) are arranged at intervals along the circumference of the plug (150), and the multiple elastic snap-fit ​​members (170) are arranged at intervals along the circumference of the plug (150). Each elastic snap-fit ​​member (170) corresponds to one mounting hole (162).

9. The battery cell according to any one of claims 1 to 7, characterized in that, The battery cell further includes a rough layer (180), which is connected to the side of the current collector (140) facing the terminal post (160) along the first direction (Z). The rough layer (180) is located on the outer periphery of the connector (150) and abuts against the terminal post (160).

10. A battery pack, characterized in that, Includes the battery cell according to any one of claims 1 to 9.

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