Battery monomer and battery pack

Abstract

The utility model provides a battery monomer and a battery pack, and relates to the technical field of batteries. The single battery has a first direction, and comprises a shell with a containing cavity, an electrode assembly arranged in the containing cavity, a cover plate connected with the shell to cover the containing cavity, and a pole penetrating through the cover plate and electrically connected with the electrode assembly. The shell is provided with a first side wall, a first reinforcing rib is arranged on the side, close to the electrode assembly, of the first side wall in the first direction, and the size of the first reinforcing rib in the first direction is gradually increased from the direction away from the cover plate to the direction close to the cover plate, so that the anti-extrusion strength of the shell can be improved; therefore, the possibility of cracking and deformation of the shell when the shell is extruded by external force is reduced, and the safety of the battery monomer is 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] Existing battery cells have weak compressive strength in their casings, making them prone to cracking and deformation when subjected to external pressure, thus affecting the safety of the battery cells. 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 that the casing of the battery cell is prone to cracking and deformation when subjected to external pressure.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0006] In a first aspect, embodiments of this application provide a battery cell having a first orientation, the battery cell comprising:

[0007] The shell has a receiving cavity;

[0008] The electrode assembly is disposed within the receiving cavity;

[0009] A cover plate is connected to the housing to seal the receiving cavity;

[0010] The electrode post is disposed through the cover plate and is electrically connected to the electrode assembly;

[0011] The housing has a first sidewall, and a first reinforcing rib is provided on the side of the first sidewall near the electrode assembly along the first direction. The size of the first reinforcing rib gradually increases along the first direction from the direction away from the cover plate to the direction near the cover plate.

[0012] In one embodiment of the first aspect, the housing further has a second sidewall disposed opposite to the first sidewall along the first direction, and a second reinforcing rib is provided on the side of the second sidewall near the electrode assembly along the first direction, the size of the second reinforcing rib gradually increasing from the direction away from the cover plate to the direction near the cover plate along the first direction.

[0013] In one embodiment of the first aspect, the battery cell has a second direction intersecting the first direction, and a plurality of first reinforcing ribs are provided, the plurality of first reinforcing ribs being spaced apart along the second direction, and a plurality of second reinforcing ribs are provided, the plurality of second reinforcing ribs being spaced apart along the second direction.

[0014] In one embodiment of the first aspect, the battery cell has a second direction intersecting the first direction, and the housing also has a first corner portion and two large sidewalls. The two large sidewalls are arranged opposite to each other along the second direction. The large sidewalls are connected to the first sidewall through the first corner portion and to the second sidewall through the first corner portion. The first reinforcing rib and the first corner portion are spaced apart along the second direction.

[0015] In one embodiment of the first aspect, the battery cell further has a third direction intersecting the first direction, the first sidewall has a support portion along the first direction near the electrode assembly, the support portion abuts against the cover plate along the third direction, and the first reinforcing rib is disposed on the side of the support portion along the first direction near the electrode assembly.

[0016] In one embodiment of the first aspect, the support portion has an inclined surface at one end near the cover plate along the third direction, the inclined surface being connected to the first reinforcing rib, and the dimension of the inclined surface gradually decreasing along the first direction from the direction away from the cover plate to the direction near the cover plate. In one embodiment of the first aspect, the battery cell has a projection plane perpendicular to the first direction, and the battery cell further includes an anti-compression member connected to the side of the first sidewall away from the electrode assembly along the first direction, the orthographic projection of the anti-compression member on the projection plane and the orthographic projection of the first reinforcing rib on the projection plane at least partially coincide.

[0017] In one embodiment of the first aspect, the housing has an opening communicating with the receiving cavity, the cover plate is located at one end of the housing having the opening, and the anti-crush member and / or the first reinforcing rib is disposed close to the cover plate.

[0018] In one embodiment of the first aspect, the battery cell further includes an insulating film covering the electrode assembly, and the first reinforcing rib and the insulating film are spaced apart along the first direction.

[0019] Secondly, embodiments of this application provide a battery pack including the battery cells described in any of the embodiments of the first aspect above.

[0020] The beneficial effects of this application are as follows:

[0021] The battery cell provided in this application has a first reinforcing rib on the first sidewall of the casing near the electrode assembly along a first direction, and the dimension of the first reinforcing rib gradually increases from the direction away from the cover plate to the direction near the cover plate. In this way, the first reinforcing rib can apply a fixed stress to the first sidewall to counteract the deformation stress generated by the casing, thereby improving the casing's compressive strength and reducing the possibility of cracking and deformation of the casing under external pressure, thus improving the safety of the battery cell.

[0022] 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

[0023] 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.

[0024] Figure 1 A three-dimensional structural schematic diagram of a battery cell in one embodiment of this application is shown;

[0025] Figure 2 It shows Figure 1 A schematic diagram of the decomposed structure;

[0026] Figure 3 This paper shows a schematic diagram of the structure of a single battery cell in one embodiment of the present application.

[0027] Figure 4 It shows Figure 3 Schematic diagram of the cross-sectional structure at point AA;

[0028] Figure 5 It shows Figure 4 A magnified structural diagram of region B in the middle;

[0029] Figure 6 A three-dimensional structural schematic diagram of the housing in one embodiment of this application is shown;

[0030] Figure 7 It shows Figure 6 A magnified structural diagram of region C in the middle;

[0031] Figure 8 This paper shows a schematic diagram of the housing structure from one perspective in one embodiment of this application;

[0032] Figure 9It shows Figure 8 Schematic diagram of the cross-sectional structure at point DD;

[0033] Figure 10 It shows Figure 9 A magnified structural diagram of region E in the middle.

[0034] Explanation of key component symbols:

[0035] 100-Battery cell; 110-Electrode assembly; 111-Cell; 120-Cover assembly; 121-Cover; 122-Terminal post; 123-Plastic part; 130-Housing; 1301-First sidewall; 1302-Second sidewall; 1303-Large sidewall; 131-Receiving cavity; 132-Opening; 133-First reinforcing rib; 134-Support part; 135-Sloping surface; 136-First corner; 137-Second reinforcing rib; 138-Second corner; 140-Anti-compression part; 150-Insulating film; X-First direction; Y-Second direction; Z-Third direction. Detailed Implementation

[0036] 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.

[0037] 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.

[0038] 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," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0039] 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, "multiple" means two or more, unless otherwise explicitly defined.

[0040] In the description of this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0041] In the description of this application, the term "and / or" indicates that three relationships can exist. For example, A and / or B can represent three cases: A alone, A and B simultaneously, and B alone. Additionally, the character " / " generally indicates that the preceding and following objects have an "or" relationship.

[0042] 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.

[0043] Existing battery cells suffer from weak compressive strength in their casings, making them prone to cracking and deformation under external pressure, thus affecting the safety of the battery cells. Related technologies improve the compressive strength of the casing by increasing its overall wall thickness. While this enhances the safety of the battery cells, it significantly increases the weight of the casing, thereby impacting the energy density of the battery cells.

[0044] To solve the above technical problems, such as Figure 1 and Figure 2 As shown, in a first aspect, embodiments of this application provide a battery cell 100, which relates to the field of battery technology and is mainly used in battery packs.

[0045] Combination Figures 8 to 10As shown, the battery cell 100 provided in this embodiment has a first direction X and includes: a housing 130, an electrode assembly 110, a cover plate 121 and a terminal post 122.

[0046] The housing 130 has a receiving cavity 131; the electrode assembly 110 is disposed in the receiving cavity 131; the cover plate 121 is connected to the housing 130 to cover the receiving cavity 131; the electrode post 122 is disposed through the cover plate 121 and is electrically connected to the electrode assembly 110; the housing 130 has a first side wall 1301, and the first side wall 1301 is provided with a first reinforcing rib 133 along the first direction X on the side near the electrode assembly 110, and the size of the first reinforcing rib 133 along the first direction X gradually increases from the direction away from the cover plate 121 to the direction near the cover plate 121.

[0047] For example, the terminal 122 can be a positive terminal or a negative terminal, and no specific restrictions are placed on the type of terminal 122.

[0048] It should be noted that "the size of the first reinforcing rib 133 gradually increases from the direction away from the cover plate 121 to the direction closer to the cover plate 121" can be understood as: the size of the first reinforcing rib 133 in the first direction X gradually changes, showing a pattern that the size is larger the closer to the cover plate 121 and smaller the further away from the cover plate 121.

[0049] It is understood that the battery cell 100 provided in this embodiment has a first reinforcing rib 133 provided on the side of the first sidewall 1301 of the housing 130 along the first direction X near the electrode assembly 110, and the size of the first reinforcing rib 133 along the first direction X gradually increases from the direction away from the cover plate 121 to the direction near the cover plate 121. In this way, the first reinforcing rib 133 can apply a fixed stress to the first sidewall 1301 to resist the deformation stress generated by the housing 130, thereby improving the compressive strength of the housing 130 and reducing the possibility of cracking and deformation of the housing 130 when subjected to external pressure, thus improving the safety of the battery cell 100.

[0050] Meanwhile, compared to the method of increasing the overall wall thickness of the casing 130 to improve the compressive strength in related technologies, the design of using the first reinforcing rib 133 does not significantly increase the weight of the casing 130, thereby reducing the impact on the energy density of the battery cell 100.

[0051] like Figure 1 and Figure 2As shown, in one embodiment, the housing 130 further has a second sidewall 1302, which is disposed opposite to the first sidewall 1301 along a first direction X. A second reinforcing rib 137 is provided on the side of the second sidewall 1302 near the electrode assembly 110 along the first direction X. The size of the second reinforcing rib 137 gradually increases along the first direction X from the direction away from the cover plate 121 to the direction near the cover plate 121. This further improves the compressive strength of the housing 130.

[0052] like Figure 1 , Figure 2 and Figure 6 As shown, the battery cell 100 further has a second direction Y intersecting the first direction X, and multiple first reinforcing ribs 133 are provided, which are arranged at intervals along the second direction Y. Multiple second reinforcing ribs 137 are provided, which are arranged at intervals along the second direction Y.

[0053] For example, the number of first reinforcing ribs 133 and / or the number of second reinforcing ribs 137 can be two, three, four, five, etc., without any specific limitation.

[0054] It is understood that by providing a plurality of first reinforcing ribs 133 at intervals along the second direction Y on the first sidewall 1301 of the housing 130, and providing a plurality of second reinforcing ribs 137 at intervals along the second direction Y on the second sidewall 1302 of the housing 130, the compressive strength of the housing 130 is further improved.

[0055] like Figure 1 , Figure 6 and Figure 7 As shown, the battery cell 100 further has a second direction Y intersecting the first direction X. The housing 130 also has a first corner portion 136 and two large sidewalls 1303. The two large sidewalls 1303 are arranged opposite each other along the second direction Y. The large sidewalls 1303 are connected to the first sidewall 1301 through the first corner portion 136 and to the second sidewall 1302 through the first corner portion 136. The first reinforcing rib 133 and the first corner portion 136 are arranged at intervals along the second direction Y, that is, the first reinforcing rib 133 and the first corner portion 136 have a certain distance L1 in the second direction Y. In this way, during the manufacturing process of the housing 130, the first corner portion 136 can be extended evenly, reducing the possibility of burrs and deformation of the housing 130 at the first corner portion 136, resulting in indentations.

[0056] like Figure 7As shown, in a specific embodiment, the support portion 134 can extend to the side of the first corner portion 136 near the electrode assembly 110, so that the support portion 134 and the cover plate 121 have a larger contact area, thereby supporting the cover plate 121 more stably; and it also plays a role in enhancing the structural strength of the first corner portion 136, thereby reducing the possibility of deformation and cracking of the housing 130 at the first corner portion 136.

[0057] like Figures 3 to 6 As shown, in one embodiment, the battery cell 100 further has a third direction Z intersecting the first direction X. A support portion 134 is provided on the side of the first sidewall 1301 near the electrode assembly 110 along the first direction X. The support portion 134 abuts against the cover plate 121 along the third direction Z. A first reinforcing rib 133 is disposed on the side of the support portion 134 near the electrode assembly 110 along the first direction X. Thus, the first reinforcing rib 133 enhances the compressive strength of the housing 130 and allows the support portion 134 to more stably support the cover plate 121, thereby enhancing the stability of the cover plate 121.

[0058] like Figures 7 to 10 As shown, further, the support part 134 is provided with an inclined surface 135 at one end near the cover plate 121 along the third direction Z. The inclined surface 135 is connected to the first reinforcing rib 133. The size of the inclined surface 135 along the first direction X gradually decreases from the direction away from the cover plate 121 to the direction near the cover plate 121.

[0059] It is understandable that the support 134 and the first reinforcing rib 133 are connected by a gradually changing inclined surface 135, which facilitates the removal of the shell 130 from the mold after the shell is made, thereby reducing the possibility of deformation caused by excessive extrusion inside the shell 130 during the demolding process.

[0060] like Figure 1 , Figure 8 and Figure 9 As shown, in one embodiment, the battery cell 100 has a third direction Z intersecting the first direction X, and the housing 130 has a second corner portion 138 with an arc shape. The first reinforcing rib 133 and the second corner portion 138 are arranged at intervals along the third direction Z, that is, the first reinforcing rib 133 and the second corner portion 138 have a certain distance L2 in the third direction Z. In this way, during the manufacturing process of the housing 130, the second corner portion 138 can be extended evenly, reducing the possibility of burrs and deformation of the housing 130 at the second corner portion 138, resulting in indentations.

[0061] like Figures 3 to 5As shown, in one embodiment, the battery cell 100 has a projection plane perpendicular to the first direction X. The battery cell 100 also includes an anti-compression member 140, which is connected to the side of the first sidewall 1301 away from the electrode assembly 110 along the first direction X. The orthographic projection of the anti-compression member 140 on the projection plane and the orthographic projection of the first reinforcing rib 133 on the projection plane at least partially overlap, so that the first reinforcing rib 133 and the anti-compression member 140 form a structural mutual support, thereby more effectively enhancing the compressive strength of the housing 130.

[0062] like Figure 1 , Figure 2 and Figure 6 As shown, the housing 130 further has an opening 132 communicating with the receiving cavity 131, and a cover plate 121 is located at one end of the housing 130 with the opening 132. An anti-compression member 140 and / or a first reinforcing rib 133 are disposed near the cover plate 121, that is, at least one of the anti-compression member 140 and the first reinforcing rib 133 is disposed near the cover plate 121.

[0063] It is understandable that the battery cell 100 needs to have an opening 132 on the housing 130 to allow the electrode assembly 110 to be inserted into the housing. The presence of the opening 132 makes the end of the housing 130 with the opening 132 structurally weaker than other areas. By placing the anti-compression member 140 and / or the first reinforcing rib 133 close to the cover plate 121, the compressive strength of the end of the housing 130 with the opening 132 can be effectively enhanced, thereby reducing the possibility of deformation and cracking at the end of the housing 130 with the opening 132.

[0064] like Figure 2 as well as Figures 3 to 5 As shown, in one embodiment, the battery cell 100 further includes an insulating film 150, which covers the electrode assembly 110, and the first reinforcing rib 133 and the insulating film 150 are spaced apart along the first direction X.

[0065] For example, the electrode assembly 110 includes at least one cell 111, such as one, two, three, four, etc., without any specific limitation.

[0066] It is understandable that by setting the first reinforcing rib 133 and the insulating film 150 at intervals along the first direction X, that is, by leaving a certain space between the first reinforcing rib 133 and the insulating film 150 in the first direction X, the phenomenon of the first reinforcing rib 133 excessively squeezing the electrode assembly 110 and the insulating film 150 during the use of the battery cell 100 can be reduced.

[0067] like Figures 3 to 5As shown, it should be noted that the battery cell 100 includes a cover assembly 120, which includes a cover 121, an electrode post 122, and a plastic part 123. The plastic part 123 is disposed in the receiving cavity 131 and connected to the cover 121 to achieve insulation between the cover 121 and the electrode assembly 110.

[0068] Secondly, embodiments of this application provide a battery pack including the battery cell 100 in any of the embodiments of the first aspect described above.

[0069] It should be noted that the battery cell 100 can be indirectly applied to electrical devices or energy storage devices in the form of a battery pack. Of course, it can also be directly applied to electrical devices or energy storage devices without using a battery pack.

[0070] For example, the aforementioned electrical devices may be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles may be fuel-powered cars, natural gas-powered cars, new energy vehicles, etc. New energy vehicles may be pure electric vehicles, hybrid electric vehicles, and range-extended electric vehicles, etc. Spacecraft may be airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools may 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, etc.

[0071] Furthermore, energy storage devices can be energy storage containers, energy storage power stations, etc. No specific restrictions are placed on the types of electrical devices and energy storage devices here.

[0072] It is understood that since the battery pack provided in this embodiment has the battery cell 100 in any of the embodiments of the first aspect, it has all the beneficial effects of the battery cell 100, which will not be described in detail here.

[0073] To better illustrate the beneficial effects of the embodiments of this application, the yield testing process of the battery cell 100 is provided here:

[0074] I. Test Groups: Test Group 1: The distance L1 between the first reinforcing rib 133 and the first corner portion 136 along the second direction Y > 0 mm; the distance L2 between the first reinforcing rib 133 and the second corner portion 138 along the third direction Z > 0 mm; the distance H between the first reinforcing rib 133 and the support portion 134 along the third direction Z = 0.2 mm; the angle α between the inclined surface 135 and the first sidewall 1301 = 45°; Test Group 2: The distance L1 between the first reinforcing rib 133 and the first corner portion 136 along the second direction Y > 0 mm; the distance L2 between the first reinforcing rib 133 and the second corner portion 138 along the third direction Z > 0 mm; the distance H between the first reinforcing rib 133 and the support portion 134 along the third direction Z = 0.2 mm; the angle α between the inclined surface 135 and the first sidewall 1301 = 45°; The spacing L2 in the Z direction is greater than 0 mm; the spacing H between the first reinforcing rib 133 and the support 134 along the third direction Z is 11.5 mm; the angle α between the inclined surface 135 and the first sidewall 1301 is 1°. Test group 3: The spacing L1 between the first reinforcing rib 133 and the first corner 136 along the second direction Y is greater than 0 mm; the spacing L2 between the first reinforcing rib 133 and the second corner 138 along the third direction Z is greater than 0 mm; the spacing H between the first reinforcing rib 133 and the support 134 along the third direction Z is 0.1 mm; the angle α between the inclined surface 135 and the first sidewall 1301 is 60°. °; Test group 4: The distance L1 between the first reinforcing rib 133 and the first corner portion 136 along the second direction Y > 0 mm, the distance L2 between the first reinforcing rib 133 and the second corner portion 138 along the third direction Z > 0 mm, the distance H between the first reinforcing rib 133 and the support portion 134 along the third direction Z = 11.5 mm, and the angle α between the inclined surface 135 and the first sidewall 1301 = 0.5°; Test group 5: The distance L1 between the first reinforcing rib 133 and the first corner portion 136 along the second direction Y < 0 mm, the distance L2 between the first reinforcing rib 133 and the second corner portion 138 along the third direction Z > 0 mm, the distance H between the first reinforcing rib 133 and the support portion 134 along the third direction Z = 11.5 mm, and the angle α between the inclined surface 135 and the first sidewall 1301 = 0.5°; The spacing L2 > 0 mm, the spacing H between the first reinforcing rib 133 and the support portion 134 along the third direction Z is 11.5 mm, and the angle α between the inclined surface 135 and the first side wall 1301 is 1°; Test group 6: The spacing L1 between the first reinforcing rib 133 and the first corner portion 136 along the second direction Y is 0 mm, the spacing L2 between the first reinforcing rib 133 and the second corner portion 138 along the third direction Z is < 0 mm, the spacing H between the first reinforcing rib 133 and the support portion 134 along the third direction Z is 11.5 mm, and the angle α between the inclined surface 135 and the first side wall 1301 is 1°.

[0075] It should be noted that all test groups 1 to 6 meet the following requirements: 1. There are two first reinforcing ribs 133; 2. The dimension of the first reinforcing rib 133 along the first direction X gradually increases from the direction away from the cover plate 121 to the direction closer to the cover plate 121; 3. The maximum dimension T of the first reinforcing rib 133 along the first direction X is 0.2 mm. Furthermore, parameters such as L1, L2, H, and T can be measured using a height gauge or calipers; α can be measured using a profiler scanning method.

[0076] II. Test pass criteria: 1. No burrs or deformation marks appear on the housing 130 at the first corner 136 and the second corner 138; 2. The cover plate 121 is compatible with the housing 130.

[0077] III. Test Results: In test groups 1 and 2, no burrs or deformation indentations appeared on the shell 130 at the first corner 136 and the second corner 138, and the test passed. In test group 3, α was too large, causing the inclined surface 135 to interfere with the cover plate 121, resulting in the cover plate 121 and the shell 130 not fitting together, and the test failed. In test group 4, α was too small, resulting in poor reinforcement effect of the first reinforcing rib 133 on the shell 130, resulting in insufficient compressive strength of the shell 130, and the test failed. In test group 5, L1 < 0 mm, that is, at least part of the first reinforcing rib 133 is located on the first corner 136, and the shell 130 produced burrs and deformation indentations at the first corner 136, and the test failed. In test group 6, L2 < 0 mm, that is, at least part of the first reinforcing rib 133 is located on the second corner 138, and the shell 130 produced burrs and deformation indentations at the second corner 138, and the test failed. Therefore, based on the above test results, it can be seen that in the battery cell 100 provided in this embodiment, preferably, L1 > 0 mm, L2 > 0 mm, and 1m ≤ α ≤ 45°.

[0078] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "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 this specification, the illustrative expressions of the above 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 one or more embodiments or examples. Moreover, 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.

[0079] 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 by, The battery cell has a first direction (X), and comprises: a housing (130) having a receiving cavity (131); an electrode assembly (110) disposed in the receiving cavity (131); a cover plate (121) connected with the housing (130) to cover the receiving cavity (131); a pole (122) penetratingly disposed in the cover plate (121) and electrically connected with the electrode assembly (110); wherein the housing (130) has a first side wall (1301) provided with a first reinforcing rib (133) on a side close to the electrode assembly (110) along the first direction (X), and the dimension of the first reinforcing rib (133) along the first direction (X) gradually increases from a direction away from the cover plate (121) to a direction close to the cover plate (121).

2. The battery cell of claim 1, wherein, The housing (130) further has a second side wall (1302) oppositely disposed with the first side wall (1301) along the first direction (X), and the second side wall (1302) is provided with a second reinforcing rib (137) on a side close to the electrode assembly (110) along the first direction (X), and the dimension of the second reinforcing rib (137) along the first direction (X) gradually increases from a direction away from the cover plate (121) to a direction close to the cover plate (121).

3. The battery cell of claim 2, wherein, The battery cell has a second direction (Y) intersecting the first direction (X), and the first reinforcing rib (133) is provided in plurality, and the plurality of first reinforcing ribs (133) are arranged at intervals along the second direction (Y), and the second reinforcing rib (137) is provided in plurality, and the plurality of second reinforcing ribs (137) are arranged at intervals along the second direction (Y).

4. The battery cell of claim 2, wherein, The battery cell has a second direction (Y) intersecting the first direction (X), and the housing (130) further has a first corner portion (136) and two large-face side walls (1303) oppositely disposed along the second direction (Y), the large-face side wall (1303) is connected with the first side wall (1301) through the first corner portion (136), the large-face side wall (1303) is connected with the second side wall (1302) through the first corner portion (136), and the first reinforcing rib (133) and the first corner portion (136) are arranged at intervals along the second direction (Y).

5. The battery cell of claim 1, wherein, The battery cell further has a third direction (Z) intersecting the first direction (X), and the first side wall (1301) has a support portion (134) on a side close to the electrode assembly (110) along the first direction (X), the support portion (134) abuts against the cover plate (121) along the third direction (Z), and the first reinforcing rib (133) is arranged on a side of the support portion (134) close to the electrode assembly (110) along the first direction (X).

6. The battery cell of claim 5, wherein, An inclined surface (135) is arranged at one end of the support portion (134) close to the cover plate (121) along the third direction (Z), the inclined surface (135) is connected with the first reinforcing rib (133), and a dimension of the inclined surface (135) along the first direction (X) gradually decreases from a direction away from the cover plate (121) to a direction close to the cover plate (121).

7. The battery cell of claim 1, wherein, The battery monomer has a projection plane perpendicular to the first direction (X), and further comprises an anti-extrusion piece (140) connected to one side of the first side wall (1301) away from the electrode assembly (110) along the first direction (X), and a normal projection of the anti-extrusion piece (140) on the projection plane and a normal projection of the first reinforcing rib (133) on the projection plane at least partially coincide.

8. The battery cell of claim 7, wherein, The shell (130) has an opening (132) in communication with the accommodating cavity (131), the cover plate (121) is located at one end of the shell (130) having the opening (132), and the anti-extrusion piece (140) and / or the first reinforcing rib (133) are arranged close to the cover plate (121).

9. The battery cell of claim 1, wherein, The battery monomer further comprises an insulating film (150) covering the electrode assembly (110) outside, and the first reinforcing rib (133) and the insulating film (150) are arranged apart along the first direction (X).

10. A battery pack, characterized by, The battery monomer comprises any one of claims 1-9. The battery monomer comprises any one of claims 1-9.

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