Battery cell

Abstract

The utility model discloses a single battery. The single battery comprises a shell, a battery cell and a battery cell, the plurality of pole groups are positioned in the shell and are arranged at intervals along the length direction of the shell, positive tabs and negative tabs are respectively arranged at two ends of each pole group in the length direction, and the positive tab of one pole group is opposite to and connected with the negative tab of the other pole group in two adjacent pole groups. According to the battery monomer disclosed by the utility model, the problem of poor performance easily caused by relatively long pole pieces can be solved, the capacity of the single battery monomer can be conveniently improved, and the capacity is increased and the cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and more specifically, to a battery monomer. Background Art

[0002] In some related technologies, the length of the electrode group of the battery cell is relatively short, so that the overall capacity expansion space of the battery cell is limited by process conditions; or, the length of the electrode group of the battery cell is relatively long, which reduces the strength of the electrode group and easily causes the electrode group to bend and deform, resulting in a reduced yield, and has high requirements for the molding process, making manufacturing difficult.

[0003] In other related technologies, multiple battery cells are connected in series to achieve the required capacity, but this will increase costs and waste space. Utility Model Content

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the present invention is to provide a battery cell that can reduce the disadvantages easily caused by long pole pieces and facilitates increasing the capacity of a single battery cell, thereby achieving increased capacity and reduced costs.

[0005] According to an embodiment of the present invention, a battery cell includes: a shell; a plurality of electrode groups, wherein the plurality of electrode groups are located in the shell and are spaced apart along the length direction of the shell, a positive electrode ear and a negative electrode ear are respectively provided at both ends of the length direction of the electrode group, and the positive electrode ear of one of two adjacent electrode groups is opposite to and connected to the negative electrode ear of the other.

[0006] According to the battery cell of the embodiment of the present invention, multiple electrode groups are located in the shell and are spaced apart along the length direction of the shell. Positive electrode ears and negative electrode ears are respectively provided at both ends of the length direction of the electrode group. The positive electrode ear of one of the two adjacent electrode groups is opposite to and connected to the negative electrode ear of the other. This can shorten the length of a single electrode group and reduce defects such as wrinkling, deformation, layer crosstalk, and fracture caused by the long length of the electrode piece, making it easy to achieve longer specifications of the battery cell and beneficial to increasing the capacity of a single battery cell. Compared with the related art in which multiple battery cells are connected in series, it can reduce internal resistance, reduce the number of structural parts such as the shell, and improve the volume utilization rate of the battery cell, thereby achieving the purpose of increasing capacity and reducing costs, and saving space.

[0007] In addition, the battery cell according to the above embodiment of the present invention may also have the following additional technical features:

[0008] According to the battery cells of some embodiments of the present invention, the multiple electrode groups include a first electrode group and a second electrode group, the positive electrode ear includes a first positive electrode ear and a second positive electrode ear, the negative electrode ear includes a first negative electrode ear and a second negative electrode ear, the first positive electrode ear and the first negative electrode ear are respectively provided at both ends of the length direction of the first electrode group, and the second positive electrode ear and the second negative electrode ear are respectively provided at both ends of the length direction of the second electrode group. The battery cell also includes: an end plate assembly, the end plate assembly is located between the first electrode group and the second electrode group and are connected to each other, and the first positive electrode ear and the second negative electrode ear are both passed through the end plate assembly and are connected.

[0009] According to some embodiments of the present invention, the end plate assembly includes: a first end plate; a second end plate, the first end plate and the second end plate are respectively located on both sides of the first positive electrode ear and the second negative electrode ear along the thickness direction of the shell, and both ends of the first end plate and the second end plate along the length direction of the shell are connected to the first pole group and the second pole group, and the first end plate and the second end plate are connected to each other.

[0010] According to some embodiments of the present invention, the first end plate and the second end plate are both provided with protrusions extending in a direction close to each other, the two protrusions are spaced apart along the length direction of the shell, and parts of the first positive electrode ear and the second negative electrode ear are located between the two protrusions.

[0011] According to some embodiments of the present invention, the first end plate and the second end plate are connected by snapping.

[0012] According to some embodiments of the present invention, the battery cell further includes: a support plate, which is provided between the end plate assembly and at least one of the first pole group and the second pole group, the support plate extending along the height direction of the pole group, and the first positive pole ear or the second negative pole ear is passed through the support plate.

[0013] According to some embodiments of the present invention, the thickness of the support plate is T and satisfies: 0.3 mm ≤ T ≤ 3 mm.

[0014] According to some embodiments of the present invention, the distance between the first pole group and the second pole group is H and satisfies: 5mm≤H≤10mm.

[0015] According to some embodiments of the present invention, the battery cell further includes: an insulating film, the insulating film being located inside the shell, and wrapping the plurality of pole groups along the circumferential direction of the pole groups in the length direction of the shell.

[0016] According to some embodiments of the present invention, the shell includes: a shell body, both sides of the shell body in the length direction are open to form an opening, and the multiple pole groups are arranged in the shell body; two covers, the two covers are respectively covered on the two openings, and the positive electrode ear and the negative electrode ear located on the outermost side are respectively connected to the two covers.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1 is an exploded view of a battery cell according to an embodiment of the present utility model;

[0020] Figure 2 It is a top view of the first pole group, the second pole group and the end plate assembly according to an embodiment of the present utility model;

[0021] Figure 3 This is a front view of the first pole group, the second pole group and the end plate assembly according to an embodiment of the present utility model;

[0022] Figure 4 yes Figure 3 Cross-sectional view along line AA;

[0023] Figure 5 yes Figure 3 Cross-sectional view along line BB;

[0024] Figure 6 is a top view of the first pole group and the second pole group according to an embodiment of the present utility model;

[0025] Figure 7 is a structural schematic diagram of an end plate assembly according to an embodiment of the present utility model;

[0026] Figure 8 is a front view of an end plate assembly according to an embodiment of the present utility model;

[0027] Figure 9 yes Figure 8 Cross-sectional view along the CC line;

[0028] Figure 10 yes Figure 8 Cross-sectional view along line DD;

[0029] Figure 11is a structural schematic diagram of a support plate according to an embodiment of the present utility model;

[0030] Figure 12 It is a left view of the support plate according to an embodiment of the utility model.

[0031] Reference numerals:

[0032] 100. Battery cell;

[0033] 10. Shell; 11. Shell body; 12. Cover; 111. Opening; 121. Limiting portion;

[0034] 20, electrode group; 21, positive electrode tab; 22, negative electrode tab; 211, first positive electrode tab; 212, second positive electrode tab; 221, first negative electrode tab; 222, second negative electrode tab;

[0035] 31. First pole group; 32. Second pole group;

[0036] 40. End plate assembly; 41. First end plate; 42. Second end plate; 43. Protrusion;

[0037] 50. Support plate; 51. Through hole;

[0038] 60. Insulating film. DETAILED DESCRIPTION

[0039] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0040] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention 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, and therefore should not be understood as a limitation to the present invention.

[0041] In the description of the present invention, "first feature" and "second feature" may include one or more such features, "plurality" means two or more, the first feature "above" or "below" the second feature may include the first and second features being in direct contact, or the first and second features not being in direct contact but being in contact through another feature between them, the first feature "above", "above" and "above" the second feature include the first feature being directly above and diagonally above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0042] A battery cell 100 according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0043] Reference Figures 1-6 As shown, the battery cell 100 according to an embodiment of the present invention may include: a housing 10 and a plurality of electrode groups 20. The battery cell 100 may be a lithium-ion battery or the like.

[0044] Specifically, the plurality of pole groups 20 are located in the housing 10 , and the housing 10 can protect the plurality of pole groups 20 to prevent the pole groups 20 from being exposed and damaged.

[0045] In addition, a plurality of pole groups 20 are arranged along the length direction of the housing 10 (eg Figure 1 The pole groups 20 are spaced apart in the length direction (e.g. Figure 1 A positive electrode ear 21 and a negative electrode ear 22 are respectively provided at both ends of the electrode group 20 (in the left and right directions shown in the figure). The positive electrode ear 21 of one of the two adjacent electrode groups 20 is opposite to and connected to the negative electrode ear 22 of the other, so that multiple electrode groups 20 can be connected to each other, and the positive electrode ear 21 and the negative electrode ear 22 are directly connected in the shell 10. Compared with the related art in which multiple battery cells are connected in series, the internal resistance can be reduced, so that the use effect of the battery cell 100 is good, and at the same time, the number of structural parts such as the shell 10 can be reduced, the production cost can be reduced, and the volume utilization rate of the battery cell 100 can be improved.

[0046] At the same time, the length of a single electrode group 20 can be shortened, reducing defects such as wrinkles, deformation, layer crosstalk, and breakage that are easily caused by the long length of the electrode piece, and the battery cell 100 can be made longer in specifications, which is beneficial to increasing the capacity of a single battery cell 100, thereby achieving the purpose of increasing capacity and reducing costs, and saving space.

[0047] In some embodiments, the sizes of the multiple electrode groups 20 can be set according to actual conditions. For example, the multiple electrode groups 20 of the battery cell 100 can be arranged in different lengths and sizes to meet the requirements of different equipment production lines.

[0048] In some embodiments, the positive electrode tab 21 and the negative electrode tab 22 are connected by welding, which ensures a reliable connection and can reduce processing and manufacturing costs.

[0049] It should be noted that, for the convenience of description, the directions such as "left and right direction" and "front and back direction" in the present invention are based on the direction relationship shown in the accompanying drawings, and are not limitations on the directions in actual application.

[0050] According to the battery cell 100 of the embodiment of the present invention, multiple electrode groups 20 are located in the shell 10 and are spaced apart along the length direction of the shell 10. Positive electrode ears 21 and negative electrode ears 22 are respectively provided at both ends of the length direction of the electrode group 20. The positive electrode ear 21 of one of the two adjacent electrode groups 20 is opposite to and connected to the negative electrode ear 22 of the other. This can shorten the length of a single electrode group 20 and reduce defects such as wrinkling, deformation, layer crosstalk, and fracture caused by the long length of the electrode sheet, making it easy to achieve a longer specification of the battery cell 100, which is beneficial to increasing the capacity of a single battery cell 100. Compared with the related art in which multiple battery cells are connected in series, it can reduce internal resistance, reduce the number of structural parts such as the shell 10, and improve the volume utilization rate of the battery cell 100, thereby achieving the purpose of increasing capacity and reducing costs, and saving space.

[0051] In some embodiments of the present invention, Figures 1-6 As shown, the plurality of electrode groups 20 include a first electrode group 31 and a second electrode group 32, the positive electrode tab 21 includes a first positive electrode tab 211 and a second positive electrode tab 212, and the negative electrode tab 22 includes a first negative electrode tab 221 and a second negative electrode tab 222. The length direction of the first electrode group 31 (for example Figure 1 The first positive electrode ear 211 and the first negative electrode ear 221 are respectively provided at both ends of the second electrode group 32 (in the left and right directions shown in FIG). The first positive electrode ear 211 and the first negative electrode ear 221 can realize the connection requirements of the first electrode group 31. Figure 1 A second positive electrode tab 212 and a second negative electrode tab 222 are respectively provided at both ends of the electrode assembly 32 (in the left and right directions shown in FIG). The second positive electrode tab 212 and the second negative electrode tab 222 can realize the connection requirements of the second electrode group 32.

[0052] In addition, if Figure 1-Figure 5 As shown, the battery cell 100 also includes an end plate assembly 40, which is located between the first pole group 31 and the second pole group 32, and the end plate assembly 40 is interconnected with the first pole group 31 and the second pole group 32. The end plate assembly 40 can be used to fix the first pole group 31 and the second pole group 32, which is convenient for isolating and supporting the first pole group 31 and the second pole group 32, achieving the purpose of balanced fixation, and meeting the required isolation requirements, thereby ensuring the safety of the battery cell 100.

[0053] At the same time, if Figure 4As shown, the first positive electrode ear 211 and the second negative electrode ear 222 are both provided in the end plate assembly 40, and the first positive electrode ear 211 is connected to the second negative electrode ear 222 to achieve the connection requirement between the first electrode group 31 and the second electrode group 32, and the end plate assembly 40 can protect the connection between the first positive electrode ear 211 and the second negative electrode ear 222 to ensure a reliable connection.

[0054] In some embodiments, the end plate assembly 40 and the first pole group 31 and the second pole group 32 can be connected by gluing or hot melting to meet the required connection requirements and ensure reliable connection.

[0055] According to some embodiments of the present invention, Figure 4 、 Figure 5 、 Figure 7-10 As shown, the end plate assembly 40 includes a first end plate 41 and a second end plate 42, and the first end plate 41 and the second end plate 42 are respectively located at the first positive electrode ear 211 and the second negative electrode ear 222 along the thickness direction of the shell 10 (for example Figure 4 The first end plate 41 and the second end plate 42 are connected to each other on both sides (in the front-to-back direction shown in FIG). This allows the end plate assembly 40 to be split into two parts. When the end plate assembly 40 is installed, the first end plate 41 and the second end plate 42 can be installed from both sides of the first positive electrode tab 211 and the second negative electrode tab 222 along the thickness direction of the housing 10, respectively. This allows the first positive electrode tab 211 and the second negative electrode tab 222 to be avoided, meeting the required avoidance requirements and making the installation and removal of the end plate assembly 40 more convenient.

[0056] In addition, both ends of the first end plate 41 and the second end plate 42 along the length direction of the shell 10 are connected to the first pole group 31 and the second pole group 32, which can meet the connection requirements of the end plate assembly 40 with the first pole group 31 and the second pole group 32, ensure that the first pole group 31, the second pole group 32 and the end plate assembly 40 are reliably connected, and make the connection structure compact, which is conducive to reducing the occupied space.

[0057] In some embodiments of the present invention, Figure 4 、 Figure 7 and Figure 9 As shown, both the first end plate 41 and the second end plate 42 are provided with a protrusion 43 extending toward each other. The two protrusions 43 are spaced apart along the length of the housing 10, and portions of the first positive tab 211 and the second negative tab 222 are located between the two protrusions 43. Thus, the two protrusions 43 support and position the first positive tab 211 and the second negative tab 222, preventing problems such as bending and overlapping of the first positive tab 211 and the second negative tab 222. This ensures reliable protection of the first positive tab 211 and the second negative tab 222, thereby ensuring the safety of the battery cell 100.

[0058] In some embodiments, the connection between the first positive electrode tab 211 and the second negative electrode tab 222 is located between the two protrusions 43, so that the two protrusions 43 reliably protect the connection between the first positive electrode tab 211 and the second negative electrode tab 222, avoiding problems such as overlapping caused by bending, thereby ensuring the safety of the battery cell 100.

[0059] According to some embodiments of the present invention, Figure 5 、 Figure 7 and Figure 10 As shown, the first end plate 41 and the second end plate 42 are connected by snapping, which ensures that the first end plate 41 and the second end plate 42 are reliably connected, and is easy to install and disassemble, which is beneficial to improving assembly efficiency.

[0060] In some embodiments of the present invention, Figure 4-Figure 6 、 Figure 11 and Figure 12 As shown, the battery cell 100 further includes a support plate 50, and a support plate 50 is provided between the end plate assembly 40 and at least one of the first pole group 31 and the second pole group 32, that is, a support plate 50 is provided between the end plate assembly 40 and the first pole group 31, or a support plate 50 is provided between the end plate assembly 40 and the second pole group 32, or a support plate 50 is provided between the end plate assembly 40 and the first pole group 31 and the second pole group 32, and the support plate 50 is provided along the height direction of the pole group 20 (for example Figure 3 The support plate 50 extends in the up and down directions shown in the figure, and the support stability between the end plate assembly 40 and the first pole group 31 or the second pole group 32 can be increased, so that the support force of the first pole group 31 and the second pole group 32 is more balanced, avoiding the problems of internal movement and damage caused by the first pole group 31 and the second pole group 32 when they are installed in the shell 10, thereby reducing the risk of damaging the pole group 20.

[0061] In addition, if Figure 6 As shown, the first positive electrode tab 211 or the second negative electrode tab 222 is penetrated by the support plate 50. The support plate 50 can protect the first positive electrode tab 211 or the second negative electrode tab 222 to prevent other structures from contacting the first positive electrode tab 211 or the second negative electrode tab 222 and causing problems such as short circuit, thereby ensuring the safety of the battery cell 100.

[0062] In some embodiments, as Figure 11 and Figure 12 As shown, the support plate 50 is formed into a flat plate structure, which can increase the support stability between the end plate assembly 40 and the first pole group 31 or the second pole group 32, while making the structure of the support plate 50 simple, easy to process and manufacture, and conducive to reducing production costs.

[0063] In some embodiments, the support plate 50 is a plastic part that can meet the insulation requirements between the first electrode group 31 and the second electrode group 32. The plastic part is light in weight and can reduce the overall weight of the battery cell 100, facilitating lightweighting, while reducing production costs and improving production efficiency.

[0064] In some embodiments, as Figure 11 and Figure 12 As shown, a through hole 51 is provided on the support plate 50, through which the first positive electrode ear 211 or the second negative electrode ear 222 can be avoided, making it easier for the first positive electrode ear 211 or the second negative electrode ear 222 to pass through the support plate 50, so that the structure of the support plate 50 is simple and easy to process and manufacture.

[0065] In some embodiments, as Figure 12 As shown, the minimum distance between the hole wall of the through hole 51 and the outer peripheral wall of the support plate 50 is greater than or equal to 0.5 mm, that is, the minimum distance between the hole wall of the through hole 51 and the outer peripheral wall of the support plate 50 is W and satisfies 0.5 mm ≤ W. Therefore, within the above range, the structural strength of the support plate 50 can be ensured, damage to the through hole 51 and other problems can be avoided, and the support plate 50 can reliably protect the first positive electrode tab 211 or the second negative electrode tab 222. For example, in some specific embodiments, the minimum distance between the hole wall of the through hole 51 and the outer peripheral wall of the support plate 50 can be 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, etc.

[0066] According to some embodiments of the present invention, Figure 6 As shown, the thickness of the support plate 50 is T and satisfies the following conditions: 0.3mm ≤ T ≤ 3mm. Thus, within this range, while ensuring sufficient support strength for the support plate 50, the thickness is avoided, which would otherwise occupy excessive space. This reduces production costs and facilitates lightweighting and miniaturization of the battery cell 100. For example, in some specific embodiments, the thickness of the support plate 50 can be 0.3mm, 0.5mm, 1.0mm, 1.5mm, 2.0mm, 2.5mm, 3mm, etc.

[0067] In some embodiments of the present invention, Figure 6 As shown, the spacing between the first electrode group 31 and the second electrode group 32 is H and satisfies the following: 5mm ≤ H ≤ 10mm. Thus, within this range, the end plate assembly 40 can be positioned between the first electrode group 31 and the second electrode group 32, ensuring a compact structure among the first and second electrode groups 31, 32, and the end plate assembly 40, thereby facilitating miniaturization of the battery cell 100 and reducing space requirements. For example, in some specific embodiments, the spacing between the first electrode group 31 and the second electrode group 32 can be 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, etc.

[0068] According to some embodiments of the present invention, Figure 1 As shown, the battery cell 100 further includes an insulating film 60, which is located within the housing 10. Along the length of the housing 10, the insulating film 60 wraps around the plurality of electrode groups 20 along the circumferential direction of the electrode groups 20. The insulating film 60 can limit the position of the plurality of electrode groups 20, ensuring the consistency of the arrangement of the plurality of electrode groups 20 along the length of the housing 10, facilitating the subsequent installation of the plurality of electrode groups 20 within the housing 10. The insulating film 60 can meet the insulation requirements between the electrode groups 20 and the housing 10, preventing problems such as short circuits. At the same time, it can protect the plurality of electrode groups 20, effectively resisting erosion and damage from the external environment, and ensuring the safety of the battery cell 100. For example, the insulating film 60 is a polyester film (MYLAR).

[0069] In some embodiments of the present invention, Figure 1 As shown, the housing 10 includes a housing body 11 and two covers 12. The length direction of the housing body 11 (for example Figure 1 The two sides of the shell body 11 (in the left and right directions shown in the figure) are open to form openings 111, and multiple electrode groups 20 are arranged in the shell body 11, so that the multiple electrode groups 20 can be installed in the shell body 11 through the openings 111, which is convenient for placing the multiple electrode groups 20. The two covers 12 are respectively covered with the two openings 111, and the openings 111 can be sealed by the covers 12 to meet the assembly requirements of the battery cell 100, and the positive electrode ear 21 and the negative electrode ear 22 located on the outermost side are respectively connected to the two covers 12 to realize the assembly of the battery cell 100, and can realize the electrical connection requirements of the battery cell 100 with other structures.

[0070] In some embodiments, as Figure 4-Figure 6 As shown, a limiting portion 121 is provided on the side of the cover body 12 facing the electrode group 20, extending toward the direction close to the electrode group 20. The limiting portion 121 can limit and protect the outermost positive electrode tab 21 or negative electrode tab 22 of the electrode group 20, ensuring that the outermost positive electrode tab 21 and negative electrode tab 22 are reliably connected to the two cover bodies 12, thereby ensuring the safety of the battery cell 100.

[0071] In some embodiments, the battery cell 100 can be used as a power battery in electric vehicles and energy storage fields to meet the required power demand. The battery cell 100 of the present invention is located in the shell 10 through multiple electrode groups 20 and is spaced apart along the length direction of the shell 10. The two ends of the electrode group 20 in the length direction are respectively provided with a positive electrode ear 21 and a negative electrode ear 22. The positive electrode ear 21 of one of the two adjacent electrode groups 20 is opposite to and connected to the negative electrode ear 22 of the other, which can shorten the length of a single electrode group 20 and reduce the wrinkles, deformation, layer crossover, fracture and other defects easily caused by the long length of the electrode sheet, making it easy to achieve a longer specification of the battery cell 100, which is beneficial to increasing the capacity of a single battery cell 100. Compared with the related art of multiple battery cells connected in series, it can reduce the internal resistance, reduce the number of structural parts such as the shell 10, and improve the volume utilization rate of the battery cell 100, thereby achieving the purpose of increasing capacity and reducing costs, and saving space.

[0072] Other structures and operations of the battery cell 100 according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail here.

[0073] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0074] Throughout this specification, reference to terms such as "embodiment," "specific embodiment," and "example" means that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0075] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery cell, characterized in that: include: case; Multiple electrode groups are located in the shell and spaced apart along the length direction of the shell. Positive and negative electrode ears are respectively provided at both ends of the length direction of the electrode groups. The positive electrode ear of one of two adjacent electrode groups is opposite to and connected to the negative electrode ear of the other.

2. The battery cell according to claim 1, wherein: The plurality of electrode groups include a first electrode group and a second electrode group, the positive electrode tab includes a first positive electrode tab and a second positive electrode tab, the negative electrode tab includes a first negative electrode tab and a second negative electrode tab, the first electrode group is provided with the first positive electrode tab and the first negative electrode tab at both ends in the length direction, and the second electrode group is provided with the second positive electrode tab and the second negative electrode tab at both ends in the length direction, and the battery cell further includes: An end plate assembly is located between the first pole group and the second pole group and connected to each other. The first positive electrode tab and the second negative electrode tab are both passed through the end plate assembly and connected.

3. The battery cell according to claim 2, characterized in that: The end plate assembly comprises: a first end plate; The second end plate, the first end plate and the second end plate are respectively located on both sides of the first positive electrode ear and the second negative electrode ear along the thickness direction of the shell, and both ends of the first end plate and the second end plate along the length direction of the shell are connected to the first pole group and the second pole group, and the first end plate and the second end plate are connected to each other.

4. The battery cell according to claim 3, characterized in that The first end plate and the second end plate are both provided with protrusions extending toward each other, the two protrusions are spaced apart along the length direction of the shell, and portions of the first positive electrode tab and the second negative electrode tab are located between the two protrusions.

5. The battery cell according to claim 3, characterized in that: The first end plate and the second end plate are connected by snapping.

6. The battery cell according to claim 2, characterized in that The battery cell further comprises: A support plate is provided between the end plate assembly and at least one of the first pole group and the second pole group, the support plate extends along the height direction of the pole group, and the first positive electrode tab or the second negative electrode tab is passed through the support plate.

7. The battery cell according to claim 6, characterized in that The thickness of the support plate is T and satisfies: 0.3 mm ≤ T ≤ 3 mm.

8. The battery cell according to claim 2, characterized in that The distance between the first pole group and the second pole group is H and satisfies: 5 mm ≤ H ≤ 10 mm.

9. The battery cell according to claim 1, characterized in that Also includes: An insulating film is located in the shell. In the length direction of the shell, the insulating film wraps the plurality of pole groups along the circumferential direction of the pole groups.

10. The battery cell according to claim 1, characterized in that The housing comprises: A shell body, wherein both sides of the shell body in the length direction are open to form openings, and the plurality of pole groups are arranged in the shell body; Two covers are provided, and the two covers are respectively covered on the two openings. The positive electrode tab and the negative electrode tab located on the outermost sides are respectively connected to the two covers.

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