Battery cell and battery pack

Abstract

The application provides a battery monomer and a battery pack, and relates to the technical field of batteries. The conductive part of the battery monomer comprises a first conductive part, a second conductive part and a third conductive part, the third conductive part is connected with the first conductive part and the second conductive part respectively, the third conductive part is connected with a pole, and the third conductive part is connected between the first conductive part and the second conductive part along a first direction; in a plurality of electrode assemblies, the tabs of a part of the electrode assemblies are connected with the first conductive part, and the tabs of another part of the electrode assemblies are connected with the second conductive part. In this way, the first conductive part, the third conductive part and the second conductive part arranged in sequence along the first direction help to reduce the extension span of the tabs, thereby helping to shorten the length of the tabs, so as to improve the length redundancy of the tabs, and the electrical performance and safety of the battery monomer are improved.

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] The battery cell is a crucial component of the battery pack. Within a battery cell, conductive elements are typically used to electrically connect to the terminals and tabs of the electrode assembly, respectively, to achieve electrical connection between the electrode assembly and the terminals. However, as the number of electrode assemblies increases, the length of the tabs also increases, and excessively long tabs can negatively impact the battery cell's electrical performance and safety. Utility Model Content

[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 shorten the length of the tabs to improve the electrical performance and safety of the battery cell.

[0005] To achieve the above objectives, 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 direction and a second direction perpendicular to each other. The battery cell includes: a housing; an end cap connected to one end of the housing; a terminal post passing through the end cap; a plurality of electrode assemblies disposed within the housing, the plurality of electrode assemblies being arranged along the second direction, each electrode assembly including an electrode body and a tab connected to each other; and a conductive element disposed within the housing, the conductive element including a first conductive portion, a second conductive portion, and a third conductive portion, the third conductive portion being connected to the first conductive portion and the second conductive portion respectively, the third conductive portion being electrically connected to the terminal post, and the third conductive portion being connected between the first conductive portion and the second conductive portion along the first direction; in the plurality of electrode assemblies, the tabs of a portion of the electrode assemblies are electrically connected to the first conductive portion, and the tabs of another portion of the electrode assemblies are electrically connected to the second conductive portion.

[0006] In some embodiments of the first aspect, the first conductive portion and the second conductive portion are disposed opposite to each other in the first direction; the third conductive portion is located at the center of the plurality of electrode assemblies along the second direction, and in the plurality of electrode assemblies, the tabs of the electrode assemblies farther from the third conductive portion are electrically connected to the first conductive portion, and the tabs of the electrode assemblies closer to the third conductive portion are electrically connected to the second conductive portion.

[0007] In some embodiments of the first aspect, among the plurality of electrode assemblies, the tabs of the electrode assembly located away from the third conductive portion along the second direction are electrically connected to the side of the first conductive portion near the electrode body, and the tabs of the electrode assembly located near the third conductive portion along the second direction are electrically connected to the side of the second conductive portion near the electrode body.

[0008] In some embodiments of the first aspect, among the plurality of electrode assemblies, the tab of the electrode assembly away from the third conductive portion is electrically connected to the side of the first conductive portion near the end cap, and the tab of the electrode assembly near the third conductive portion is electrically connected to the side of the second conductive portion near the electrode body.

[0009] In some embodiments of the first aspect, the first conductive portion and the second conductive portion are staggered in the second direction; in any two adjacent electrode assemblies along the second direction, the tab of one electrode assembly is electrically connected to the first conductive portion, and the tab of the other electrode assembly is electrically connected to the second conductive portion.

[0010] In some embodiments of the first aspect, in the second direction, the size of both the first conductive portion and the second conductive portion is larger than the size of the third conductive portion.

[0011] In some embodiments of the first aspect, the battery cell further has a third direction that is perpendicular to both the first direction and the second direction, and the first conductive portion is provided with a first positioning groove that extends through the third direction, the first positioning groove being located on the side of the first conductive portion away from the third conductive portion along the first direction.

[0012] In some embodiments of the first aspect, a second positioning groove is provided on the side of the second conductive portion away from the third conductive portion; in the first direction, the second positioning groove and the first positioning groove are disposed opposite to each other.

[0013] In some embodiments of the first aspect, the third conductive portion is welded to the electrode post on the side near the end cap, and a rough layer is provided on the side of the third conductive portion away from the end cap, the rough layer including a plurality of protrusions that protrude in a direction away from the end cap.

[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: This application provides a battery cell whose conductive components include a first conductive portion, a second conductive portion, and a third conductive portion. The third conductive portion is connected to both the first and second conductive portions, and is connected to an electrode post, situated between the first and second conductive portions along a first direction. In a plurality of electrode assemblies, the tabs of some electrode assemblies are connected to the first conductive portion, while the tabs of other electrode assemblies are connected to the second conductive portion. Thus, by sequentially arranging the first, third, and second conductive portions along the first direction, the extension span of the tabs is reduced, thereby shortening the length of the tabs and improving the length redundancy of the tabs, thereby enhancing the electrical performance and safety of the battery cell.

[0016] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0017] 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.

[0018] Figure 1 This application shows a three-dimensional assembly structure diagram of a battery cell in some embodiments; Figure 2 It shows Figure 1 A three-dimensional assembly diagram of the middle electrode assembly and conductive components; Figure 3 It shows Figure 2 A schematic diagram of the decomposed structure; Figure 4 A three-dimensional assembly structure diagram of the electrode assembly and conductive components of a battery cell is shown in some other embodiments of this application; Figure 5 It shows Figure 4 A schematic diagram of the structure of the conductive component from one perspective; Figure 6 It shows Figure 5 A schematic diagram showing that the conductive component has a first positioning groove and a second positioning groove; Figure 7 A three-dimensional assembly structure diagram of the electrode assembly and conductive components of a battery cell is shown in some embodiments of this application; Figure 8 It shows Figure 7 A schematic diagram of the decomposed structure; Figure 9 It shows Figure 8A schematic diagram of the structure of the conductive component from one perspective.

[0019] Explanation of key component symbols: 100-Battery cell; 110-Housing; 120-End cap; 130-Terminal post; 140-Electrode assembly; 141-Electrode body; 142-Taper; 150-Conductive component; 151-First conductive part; 1511-First positioning groove; 152-Second conductive part; 1521-Second positioning groove; 153-Third conductive part; X-First direction; Y-Second direction; Z-Third direction. Detailed Implementation

[0020] 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.

[0021] 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.

[0022] 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.

[0023] 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.

[0024] In the description of this application, unless otherwise explicitly specified, the terms "installation," "connection," "attachment," etc., should be interpreted broadly. For example, they can refer to non-detachable connections (e.g., welding, riveting, etc.), detachable connections (e.g., snap-fit, screw-fit, plug-in, etc.), or integral structures; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; they 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.

[0025] 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; or B alone. Additionally, the character " / " generally indicates that the preceding and following objects have an "or" relationship.

[0026] 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.

[0027] The battery cell is a crucial component of the battery pack. Within a battery cell, conductive elements are typically used to electrically connect to the terminals and tabs of the electrode assembly, respectively, to achieve electrical connection between the electrode assembly and the terminals. However, as the number of electrode assemblies increases, the tabs need to extend further to connect with the conductive elements, resulting in an increase in tab length. Excessively long tabs can negatively impact the battery cell's electrical performance and safety.

[0028] Furthermore, when using laser welding to electrically connect the electrode post to the conductive component, the conductive component is prone to high-intensity reflection of the laser due to its smooth surface, which can easily lead to poor welding and affect the electrical performance and safety of the battery cell.

[0029] like Figure 1 As shown, to solve the above-mentioned technical problems, embodiments of this application provide a battery cell 100, which relates to the field of battery technology and is mainly used in battery packs, so as to be indirectly used in electrical devices or energy storage devices in the form of battery packs. Of course, the battery cell 100 can also be directly used in electrical devices or energy storage devices without taking the form of a battery pack, and no specific limitation is made to the application scenarios of the battery cell 100 here.

[0030] For example, electrical devices can be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools. 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, space shuttles, drones, spacecraft, etc.; electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys; power tools can be metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers; energy storage devices include 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.; no specific limitations are made on the types of electrical devices and energy storage devices here.

[0031] like Figures 1 to 3 As shown, the battery cell 100 provided in this embodiment has a first direction X and a second direction Y that are perpendicular to each other, and the battery cell 100 includes: a housing 110, an end cap 120, a terminal post 130, a plurality of electrode assemblies 140 and a conductive element 150.

[0032] The end cap 120 is connected to one end of the housing 110; the electrode post 130 passes through the end cap 120; multiple electrode assemblies 140 are disposed within the housing 110 and arranged along the second direction Y. Each electrode assembly 140 includes an electrode body 141 and an electrode tab 142 connected to each other; a conductive element 150 is disposed within the housing 110 and includes a first conductive part 151, a second conductive part 152, and a third conductive part 153. The third conductive part 153 is connected to the first conductive part 151 and the second conductive part 152, respectively, and is electrically connected to the electrode post 130. The third conductive part 153 is connected between the first conductive part 151 and the second conductive part 152 along the first direction X; among the multiple electrode assemblies 140, the electrode tabs 142 of some electrode assemblies 140 are electrically connected to the first conductive part 151, and the electrode tabs 142 of other electrode assemblies 140 are electrically connected to the second conductive part 152.

[0033] For example, the materials of the end cap 120 and / or the housing 110 can be aluminum, aluminum alloy, copper, iron, stainless steel, plastic, etc., and no specific limitation is made here.

[0034] For example, the material of the conductive element 150 and / or the material of the electrode 130 can be a metallic conductive material (e.g., copper, aluminum, silver, gold, iron, nickel, etc.) or a non-metallic conductive material (e.g., carbon-based material, superconductor, semiconductor, etc.), without specific limitations.

[0035] For example, the electrical connection method can be welding, snap-fitting, threaded connection, adhesive bonding, etc., without specific limitations.

[0036] It is understood that this embodiment provides a battery cell 100, whose conductive component 150 includes a first conductive portion 151, a second conductive portion 152, and a third conductive portion 153. The third conductive portion 153 is connected to the first conductive portion 151 and the second conductive portion 152, respectively, and is connected to the terminal post 130, and is connected between the first conductive portion 151 and the second conductive portion 152 along the first direction X. In a plurality of electrode assemblies 140, the tabs 142 of a portion of the electrode assemblies 140 are connected to the first conductive portion 151, and the tabs 142 of another portion of the electrode assemblies 140 are connected to the second conductive portion 152. In this way, by arranging the first conductive portion 151, the third conductive portion 153, and the second conductive portion 152 sequentially along the first direction X, it is helpful to reduce the extension span of the tabs 142, thereby helping to shorten the length of the tabs 142, improving the length redundancy of the tabs 142, and thus improving the electrical performance and safety of the battery cell 100.

[0037] like Figure 2 , Figure 4 and Figure 5 As shown, in some embodiments, in the first direction X, the first conductive portion 151 and the second conductive portion 152 are disposed opposite to each other; the third conductive portion 153 is located at the center of the plurality of electrode assemblies 140 along the second direction Y; among the plurality of electrode assemblies 140, the tabs 142 of the electrode assembly 140 along the second direction Y away from the third conductive portion 153 are electrically connected to the first conductive portion 151, and the tabs 142 of the electrode assembly 140 along the second direction Y close to the third conductive portion 153 are electrically connected to the second conductive portion 152. This layout design facilitates the electrical connection between the tabs 142 and the conductive element 150, helps to reduce the extension span of the tabs 142, thereby helping to shorten the length of the tabs 142.

[0038] like Figure 5 As shown, further, in the second direction Y, the size of the first conductive part 151 is larger than the size of the second conductive part 152.

[0039] It is understood that the relatively long first conductive portion 151 facilitates the electrical connection between the tab 142 of the electrode assembly 140, which is far from the third conductive portion 153, and the conductive element 150, and the relatively short second conductive portion 152 facilitates the electrical connection between the tab 142 of the electrode assembly 140, which is close to the third conductive portion 153, and the conductive element 150.

[0040] like Figure 2 and Figure 3As shown, in one specific embodiment, among the plurality of electrode assemblies 140, the tabs 142 of the electrode assembly 140 furthest from the third conductive portion 153 are electrically connected to the side of the first conductive portion 151 near the electrode body 141, and the tabs 142 of the electrode assembly 140 near the third conductive portion 153 are electrically connected to the side of the second conductive portion 152 near the electrode body 141. This layout design helps to reduce the extension span of the tabs 142 from the electrode body 141 to the conductive member 150, thereby helping to shorten the length of the tabs 142.

[0041] like Figure 4 As shown, in another specific embodiment, among the plurality of electrode assemblies 140, the tab 142 of the electrode assembly 140 away from the third conductive part 153 is electrically connected to the side of the first conductive part 151 near the end cap 120, and the tab 142 of the electrode assembly 140 near the third conductive part 153 is electrically connected to the side of the second conductive part 152 near the electrode body 141.

[0042] It is understandable that by electrically connecting the tab 142 of the electrode assembly 140, which is away from the third conductive part 153, to the side of the first conductive part 151 near the end cap 120, it can be understood that the tab 142 of this part of the electrode assembly 140 bypasses the edge of the first conductive part 151 and is electrically connected to the first conductive part 151. This can reduce the possibility of a short circuit caused by the part of the tab 142 that is electrically connected to the first conductive part 151 being inserted backwards into the electrode body 141, thereby helping to improve the safety of the battery cell 100.

[0043] like Figures 7 to 9 As shown, in some embodiments, the first conductive portion 151 and the second conductive portion 152 are staggered in the second direction Y; in any two adjacent electrode assemblies 140 along the second direction Y, the tab 142 of one electrode assembly 140 is electrically connected to the first conductive portion 151, and the tab 142 of the other electrode assembly 140 is electrically connected to the second conductive portion 152. This layout design also helps to reduce the extension span of the tab 142 from the electrode body 141 to the conductive element 150, thereby also helping to shorten the length of the tab 142.

[0044] like Figure 9 As shown, further, in the second direction Y, the size of the first conductive portion 151 is equal to the size of the second conductive portion 152. This makes the first conductive portion 151 and the second conductive portion 152 dimensionally consistent, which helps to reduce the dimensional redundancy of the first conductive portion 151 and the second conductive portion 152, thereby helping to reduce the manufacturing cost of the conductive component 150 and contributing to the lightweight design of the battery cell 100.

[0045] like Figure 5 and Figure 9As shown, in some embodiments, in the second direction Y, the size of the first conductive part 151 and the size of the second conductive part 152 are both larger than the size of the third conductive part 153, that is, the size of the third conductive part 153 is smaller than the size of the first conductive part 151 and the size of the second conductive part 152, which helps to reduce the size redundancy of the third conductive part 153, thereby helping to reduce the manufacturing cost of the conductive part 150 and contributing to the lightweight design of the battery cell 100.

[0046] like Figure 6 As shown, in some embodiments, the battery cell also has a third direction Z that is perpendicular to both the first direction X and the second direction Y. The first conductive part 151 is provided with a first positioning groove 1511 that extends through the third direction Z. The first positioning groove 1511 is located on the side of the first conductive part 151 away from the third conductive part 153 along the first direction.

[0047] It is understandable that when the battery cell 100 includes an insulating component, the insulating component is disposed on the side of the end cap 120 near the electrode body 141. By providing a first positioning groove 1511 on the side of the first conductive part 151 away from the third conductive part 153, the first positioning groove 1511 can be positioned with the fixture to prevent the conductive part 150 from sliding during the welding process. In this way, when the conductive part 150 is installed on the side of the insulating part near the electrode body 141, the positioning by the first positioning groove 1511 can achieve the effect of accurate positioning, thereby reducing the installation difficulty of the conductive part 150 and increasing the stability of the conductive part 150.

[0048] like Figure 5 As shown, a second positioning groove 1521 is further provided on the side of the second conductive part 152 away from the third conductive part 153; in the first direction X, the second positioning groove 1521 and the first positioning groove 1511 are arranged opposite to each other.

[0049] It is understandable that by providing a first positioning groove 1511 on the side of the first conductive part 151 away from the third conductive part 153, and providing a second positioning groove 1521 on the side of the second conductive part 152 away from the third conductive part 153, a better positioning effect can be achieved by positioning the first positioning groove 1511 and the second positioning groove 1521 with the fixture during the process of installing the conductive part 150 on the side of the insulating part close to the electrode body 141. This further reduces the installation difficulty of the conductive part 150 and can further increase the stability of the conductive part 150.

[0050] It should be noted that the above-mentioned insulating component is used to achieve insulation between the conductive component 150 and the end cap 120, and its materials can be selected from the following categories: 1. Synthetic organic insulating materials: plastics (such as polyethylene, polyvinyl chloride, polypropylene, polytetrafluoroethylene, epoxy resin, etc.), synthetic rubber (such as silicone rubber, nitrile rubber, etc.), synthetic fibers (such as 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., without specific limitations.

[0051] In some embodiments, the third conductive portion 153 is welded to the pole post 130 on the side near the end cap 120, and a rough layer is provided on the side of the third conductive portion 153 away from the end cap 120. The rough layer includes a plurality of protrusions, with adjacent protrusions spaced apart.

[0052] It is understandable that when the third conductive part 153 is electrically connected to the electrode post 130 by laser welding, the electrode post 130 is located on the side of the third conductive part 153 closer to the end cap 120, and the laser beam is located on the side of the third conductive part 153 away from the end cap 120. This side is prone to high intensity reflection of the laser due to its smooth surface, which can easily lead to poor welding. By providing a rough layer on the side of the third conductive part 153 away from the end cap 120, the rough layer includes multiple protrusions that protrude in the direction away from the end cap 120 and are spaced apart from each other. The multiple protrusions arranged at intervals form a rough layer, which can increase the surface roughness of the side of the third conductive part 153 away from the end cap 120, which helps to suppress the reflection of the laser and thus helps to improve the welding yield.

[0053] It should be noted that, in this embodiment, when the battery cell 100 has a first direction X, a second direction Y and a third direction Z that are perpendicular to each other, the end cap 120 is located at one end of the housing 110 along the third direction Z, the conductive element 150 is located between the end cap 120 and the electrode body 141 along the third direction Z, the rough layer is located on the side of the third conductive part 153 away from the end cap 120 along the third direction Z, and the pole post 130 is welded to the side of the third conductive part 153 near the end cap 120 along the third direction Z.

[0054] It should be noted that the battery cell 100 provided in this embodiment mainly relies on the movement of metal ions between the positive and negative electrode plates to operate. The battery cell 100 can be cuboid, cylindrical, flat, or other shapes; according to the packaging method, the battery cell 100 provided in this embodiment can be a square battery, a cylindrical battery, a pouch battery, etc.; according to the type of metal ions, the battery cell 100 provided in this embodiment can be a lithium-ion battery, a sodium-ion battery, etc.

[0055] Furthermore, according to the classification of the physical state of the electrolyte, the battery cell 100 provided in this embodiment can be a liquid battery, that is, it uses a liquid electrolyte. Exemplarily, the electrode post 130 may include a positive electrode post and a negative electrode post. The electrode assembly 140 may be manufactured using a winding process or a stacking process. The electrode assembly 140 may include an electrode body 141 and tabs 142. The tabs 142 include a positive tab and a negative tab. The electrode body 141 is immersed in the liquid electrolyte and includes a positive electrode sheet, a negative electrode sheet, and a separator layer. The separator layer is disposed between the positive electrode sheet and the negative electrode sheet. The material of the separator layer may be polypropylene, polyethylene, etc. The positive electrode sheet includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector. The positive tab is connected to the positive current collector and to the positive electrode post. The negative electrode sheet includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector. The negative tab is connected to the negative current collector and to the negative electrode post. Taking lithium ions as an example, the materials for the positive electrode current collector and the positive electrode tab can be aluminum, and the materials for the positive electrode active material layer can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, lithium manganese oxide, etc.; the materials for the negative electrode current collector and the negative electrode tab can be copper, and the negative electrode active material can be graphite, silicon, etc.

[0056] Of course, the battery cell 100 provided in this embodiment can also be a solid-state battery, that is, a solid electrolyte, such as sulfide, oxide or polymer electrolyte. Solid electrolyte can replace the separator and liquid electrolyte, and has both ion conduction and isolation functions. The type of battery cell 100 is not specifically limited here.

[0057] To address the aforementioned technical problems, embodiments of this application also provide a battery pack, including the battery cell 100 from any of the above embodiments.

[0058] It is understood that since the battery pack provided in this embodiment has 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.

[0059] 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.

[0060] 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, characterized in that, The battery cell comprises having a first direction (X) and a second direction (Y) that are perpendicular to each other: Casing (110); An end cap (120) is connected to one end of the housing (110); The pole post (130) is inserted through the end cap (120); Multiple electrode assemblies (140) are disposed within the housing (110). The multiple electrode assemblies (140) are arranged along the second direction (Y). Each electrode assembly (140) includes an electrode body (141) and a tab (142) connected to each other. A conductive element (150) is disposed within the housing (110). The conductive element (150) includes a first conductive part (151), a second conductive part (152), and a third conductive part (153). The third conductive part (153) is connected to the first conductive part (151) and the second conductive part (152) respectively. The third conductive part (153) is electrically connected to the electrode post (130), and the third conductive part (153) is connected between the first conductive part (151) and the second conductive part (152) along the first direction (X). In a plurality of electrode assemblies (140), the tabs (142) of a portion of the electrode assemblies (140) are electrically connected to the first conductive part (151), and the tabs (142) of another portion of the electrode assemblies (140) are electrically connected to the second conductive part (152).

2. The battery cell according to claim 1, characterized in that, In the first direction (X), the first conductive part (151) and the second conductive part (152) are disposed opposite to each other; the third conductive part (153) is located at the center of the plurality of electrode assemblies (140) along the second direction (Y); among the plurality of electrode assemblies (140), the tabs (142) of the electrode assembly (140) away from the third conductive part (153) are electrically connected to the first conductive part (151), and the tabs (142) of the electrode assembly (140) close to the third conductive part (153) are electrically connected to the second conductive part (152).

3. The battery cell according to claim 2, characterized in that, In the plurality of electrode assemblies (140), the tab (142) of the electrode assembly (140) that is away from the third conductive part (153) along the second direction (Y) is electrically connected to the side of the first conductive part (151) near the electrode body (141), and the tab (142) of the electrode assembly (140) that is close to the third conductive part (153) along the second direction (Y) is electrically connected to the side of the second conductive part (152) near the electrode body (141).

4. The battery cell according to claim 2, characterized in that, In the plurality of electrode assemblies (140), the tab (142) of the electrode assembly (140) away from the third conductive part (153) is electrically connected to the side of the first conductive part (151) near the end cap (120), and the tab (142) of the electrode assembly (140) near the third conductive part (153) is electrically connected to the side of the second conductive part (152) near the electrode body (141).

5. The battery cell according to claim 1, characterized in that, In the second direction (Y), the first conductive part (151) and the second conductive part (152) are staggered; in any two adjacent electrode assemblies (140) along the second direction (Y), the tab (142) of one electrode assembly (140) is electrically connected to the first conductive part (151), and the tab (142) of the other electrode assembly (140) is electrically connected to the second conductive part (152).

6. The battery cell according to any one of claims 1 to 5, characterized in that, In the second direction (Y), the dimensions of the first conductive part (151) and the second conductive part (152) are both larger than the dimensions of the third conductive part (153).

7. The battery cell according to any one of claims 1 to 5, characterized in that, The battery cell also has a third direction (Z) that is perpendicular to both the first direction (X) and the second direction (Y). The first conductive part (151) is provided with a first positioning groove (1511) that passes through the third direction (Z). The first positioning groove (1511) is located on the side of the first conductive part (151) away from the third conductive part (153) along the first direction.

8. The battery cell according to claim 7, characterized in that, The second conductive part (152) is provided with a second positioning groove (1521) on the side away from the third conductive part (153); in the first direction (X), the second positioning groove (1521) and the first positioning groove (1511) are arranged opposite to each other.

9. The battery cell according to any one of claims 1 to 5, characterized in that, The third conductive part (153) is welded to the pole post (130) on the side near the end cap (120). A rough layer is provided on the side of the third conductive part (153) away from the end cap (120). The rough layer includes a plurality of protrusions that protrude in a direction away from the end cap (120).

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

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