A battery

Abstract

This invention belongs to the field of battery technology and discloses a battery including two electrode groups, a cover plate assembly, and a housing. A first mounting groove is formed at the ends of the two electrode groups that are far apart from each other, and a second mounting groove is formed at the ends of the two electrode groups that are close to each other. Each electrode group is provided with a first tab and a second tab, and a protrusion is formed on the surface of the electrode group in a second direction. The cover plate assembly includes a first cover plate body, a second cover plate body, and a plurality of terminal posts. Along a first direction, the surface of the first cover plate body opposite to the electrode group protrudes from the terminal posts. The electrode groups are snapped into the housing, and the first cover plate body, the second cover plate body, and the housing enclose a space for accommodating the electrode groups. Along a third direction, the surface of the housing opposite to the electrode groups protrudes from the terminal posts within the second mounting groove. Thus, the protrusion can increase the battery's capacity, and placing the terminal posts in the first and second mounting grooves can improve the protection of the terminal posts and increase the space utilization rate at the ends of the electrode groups.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and more particularly to a battery. Background Technology

[0002] Lithium-ion batteries are widely used as power batteries in electric vehicles and energy storage. As lithium-ion battery technology matures, the requirements for the performance and safety of lithium-ion batteries are increasing.

[0003] In related technologies, a battery includes an electrode assembly, a cover plate, and a housing. The cover plate and the housing can enclose a space for accommodating the electrode assembly. The cover plate is usually provided with a terminal post and a rivet block. The end of the electrode assembly is provided with a tab. The electrode assembly and the terminal post are electrically connected through the tab.

[0004] However, since the cover plate is mostly a flat structure, the rivet blocks and terminals protrude from the cover plate after being assembled. The rivet blocks and terminals are easily bumped and damaged during transportation and assembly, resulting in poor protection for the rivet blocks and cover plate. In addition, the connection strength between the electrode assembly and the cover plate is low, and the electrode sheets are easily damaged and shifted during the electrode assembly insertion process, which affects the safety of the battery. The space utilization rate of the battery is low, which is not conducive to improving the capacity. Summary of the Invention

[0005] The purpose of this invention is to provide a battery that solves the problems of low connection strength between the electrode assembly and the cover plate and low battery space utilization.

[0006] To achieve this objective, the present invention adopts the following technical solution: A battery includes: two electrode groups arranged along a first direction, with a first mounting groove formed at the ends of the two electrode groups that are far apart from each other, and a second mounting groove formed at the ends of the two electrode groups that are close to each other; each electrode group is provided with a first electrode tab and a second electrode tab, the first electrode tab being disposed in the first mounting groove and the second electrode tab being disposed in the second mounting groove; and a protrusion formed on the surface of the electrode group in a second direction; a cover plate assembly, the cover plate assembly including a first cover plate body, a second cover plate body, and a plurality of terminal posts, the first cover plate body being disposed corresponding to the first mounting groove and the second cover plate body being disposed corresponding to the second mounting groove; the terminal posts disposed in the first mounting groove and the first electrode tab being disposed in the second mounting groove. The first electrode tab is electrically connected, and the electrode post disposed in the second assembly groove is electrically connected to the second electrode tab. Along the first direction, the surface of the first cover plate body opposite to the electrode group protrudes from the electrode post. The electrode group is snapped into the housing. The first cover plate body, the second cover plate body, and the housing enclose a space for accommodating the electrode group. Along the third direction, the surface of the housing opposite to the electrode group protrudes from the electrode post in the second assembly groove. The first direction is the thickness direction of the first cover plate body, the second direction is the width direction of the first cover plate body, and the third direction is the length direction of the first cover plate body.

[0007] Preferably, the first mounting groove is formed at the corner of the electrode group, and the first mounting groove includes a first part and a second part. The first part is disposed at the end of the electrode group, and the second part is disposed on the side of the electrode group in the third direction. The first electrode tab is disposed in the first part and the second part; and / or, the second mounting groove extends along the first direction, and the second mounting grooves of the two electrode groups are joined together to form a space for accommodating the second electrode tab.

[0008] Preferably, along the third direction, the width of the pole group is A, the width of the pole group corresponding to the bottom wall position of the first part is L2, and satisfies 0.5≤L2 / A≤0.75; and / or, the width of the protrusion is L3, and satisfies 0.5≤L3 / A≤0.75.

[0009] Preferably, along the first direction, the distance between the second groove wall and the first groove wall is H1, and satisfies 12mm≤H1≤80mm; and / or, the distance between the first groove wall and the end face of the pole group where the first assembly groove is opened is H2, and satisfies 10mm≤H2≤40mm.

[0010] Preferably, the end of the electrode assembly is provided with an inclined surface, which is located on one side of the first assembly groove, and the width of the end of the electrode assembly is smaller than the width of the position where the first assembly groove is opened on the electrode assembly.

[0011] Preferably, along the third direction, the width of the end of the pole group is L1, the width of the pole group corresponding to the bottom wall position of the first part is L2, and the condition 0.75≤L1 / L2≤0.9 is satisfied; and / or, the angle between the inclined surface and the end face of the pole group where the first assembly groove is opened is N, and the condition 25°≤N≤60° is satisfied.

[0012] Preferably, the protrusion extends along the first direction, and the end face of the protrusion facing away from the second mounting groove is flush with the end face of the pole group at the end where the second electrode tab is disposed.

[0013] Preferably, the first assembly groove and the second assembly groove are disposed on the same side of the pole group in the second direction.

[0014] Preferably, along the third direction, the depth of the second assembly groove is F, 10mm≤F≤35mm; and / or, along the second direction, the sum of the height of the protrusion and the height of the pole group is B2, the height of the pole group is B1, and satisfies 10mm≤B2-B1≤60mm.

[0015] Preferably, along the first direction, the length of the second assembly groove is W2, the length of the pole group is E, and the condition 0.15≤W2 / E≤0.33 is met; and / or, the length of the protrusion is W1, and the condition 10mm≤E-W1≤60mm is met.

[0016] The beneficial effects of this invention are: A battery includes: two electrode groups arranged along a first direction, a cover plate assembly, and a housing. A first mounting groove is formed at the ends of the two electrode groups that are far apart from each other, and a second mounting groove is formed at the ends of the two electrode groups that are close to each other. Each electrode group has a first tab and a second tab, the first tab being disposed within the first mounting groove and the second tab being disposed within the second mounting groove. A protrusion is formed on the surface of each electrode group in a second direction. The cover plate assembly includes a first cover plate body, a second cover plate body, and a plurality of terminal posts. The first cover plate body is disposed corresponding to the first mounting groove, and the second cover plate body is disposed corresponding to the second mounting groove. The terminal posts disposed within the first mounting groove are connected to the first... The electrode is electrically connected to the electrode post disposed in the second assembly groove. The electrode post is electrically connected to the second electrode post. Along the first direction, the surface of the first cover plate body opposite to the electrode assembly protrudes from the electrode post. The electrode assembly is snapped into the housing. The first cover plate body, the second cover plate body, and the housing enclose a space for accommodating the electrode assembly. Along the third direction, the surface of the housing opposite to the electrode assembly protrudes from the electrode post in the second assembly groove. The first direction is the thickness direction of the first cover plate body, the second direction is the width direction of the first cover plate body, and the third direction is the length direction of the first cover plate body.

[0017] Thus, the terminals are positioned in the first and second assembly slots, which improves the battery's current carrying capacity and enhances the protection of the terminals, preventing them from being bumped or damaged during transportation and assembly. This fully utilizes the space at the ends and sides of the terminal assembly, making the battery structure more compact. The protrusions can increase the battery's capacity while ensuring a stable connection between the terminal assembly and the casing and cover assembly, improving the battery's structural strength and preventing damage or movement of the terminal assembly during casing insertion, thereby enhancing battery safety. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the battery structure in one embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the shell and the second cover plate body in one embodiment of the present invention; Figure 3 This is a cross-sectional view of the pole group in one embodiment of the present invention; Figure 4 This is a schematic diagram of the pole group structure in one embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of the first cover plate body in one embodiment of the present invention; Figure 6 This is an exploded view of a cover plate assembly according to an embodiment of the present invention; Figure 7 This is an exploded view of the housing and the second cover plate body in one embodiment of the present invention; Figure 8 This is a front view of the pole group in one embodiment of the present invention; Figure 9 This is a side view of the pole group in one embodiment of the present invention; Figure 10 This is a top view of the pole group in one embodiment of the present invention.

[0019] In the picture: 1. Electrode assembly; 11. First assembly slot; 111. First part; 112. Second part; 12. Second assembly slot; 13. First electrode tab; 14. Second electrode tab; 15. Protrusion; 16. Inclined surface; 17. Conductive coating; 2. Cover plate assembly; 21. First cover plate body; 211. Snap-fit ​​part; 212. Bending part; 213. Connecting part; 22. Second cover plate body; 23. Electrode post; 24. First welding block; 25. Second welding block; 26. First plastic; 27. Second plastic; 3. Housing; 31. Step; 4. Explosion-proof valve; X, First direction; Y, Second direction; Z, Third direction. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0021] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" 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 invention based on the specific circumstances.

[0022] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature 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 includes the first feature 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.

[0023] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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 the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0024] See Figures 1 to 5This invention provides a battery comprising two electrode groups 1 arranged along a first direction X, a cover plate assembly 2, and a housing 3. A first mounting groove 11 is formed at the ends of the two electrode groups 1 that are far apart from each other, and a second mounting groove 12 is formed at the ends of the two electrode groups 1 that are close to each other. Each electrode group 1 is provided with a first tab 13 and a second tab 14, the first tab 13 being disposed within the first mounting groove 11 and the second tab 14 being disposed within the second mounting groove 12. A protrusion 15 is formed on the surface of the electrode group 1 in the second direction Y. The cover plate assembly 2 includes a first cover plate body 21, a second cover plate body 22, and a plurality of terminal posts 23. The first cover plate body 21 is disposed corresponding to the first mounting groove 11, and the second cover plate body 22 is disposed corresponding to the second mounting groove 12. The electrode post 23, which is disposed in the first assembly groove 11, is electrically connected to the first electrode tab 13, and the electrode post 23, which is disposed in the second assembly groove 12, is electrically connected to the second electrode tab 14. Along the first direction X, the surface of the first cover plate body 21 facing away from the electrode group 1 protrudes from the electrode post 23. The electrode group 1 is snapped into the housing 3. The first cover plate body 21, the second cover plate body 22, and the housing 3 enclose a space for accommodating the electrode group 1. Along the third direction Z, the surface of the housing 3 facing away from the electrode group 1 protrudes from the electrode post 23 in the second assembly groove 12. The first direction X is the thickness direction of the first cover plate body 21, the second direction Y is the width direction of the first cover plate body 21, and the third direction Z is the length direction of the first cover plate body 21.

[0025] In this embodiment, conductive coating 17 is provided on the end faces of the two electrode groups 1 that are close to each other, so that the two electrode groups 1 can be electrically connected. The first assembly groove 11 is provided at the end face of the two electrode groups 1 that is far from each other, and the second assembly groove 12 is provided on the side face of the end face of the two electrode groups 1 that are close to each other. When the two electrode groups 1 are assembled, the second assembly grooves 12 corresponding to the two electrode groups 1 are connected and form a space for assembling the second cover plate body 22. The protrusion 15 is integrally formed with the electrode group 1 to improve the battery capacity. The first cover plate body 21 and the second cover plate body 22 are attached to the electrode group 1, and the housing 3 is attached to the protrusion 15 at the position corresponding to the protrusion 15. The first cover plate body 21 and the second cover plate body 22 are both sealed and fixedly connected to the housing 3 by welding. There are two housings 3 corresponding to the electrode group 1. One of the ends of the two housings 3 that are close to each other is provided with a step 31 so that the two housings 3 can be inserted into each other. The battery also includes an explosion-proof valve 4, which is provided on the second cover plate body 22.

[0026] Thus, placing the terminal post 23 in the first assembly slot 11 and the second assembly slot 12 not only improves the battery's current carrying capacity but also enhances the protection of the terminal post 23, preventing it from being bumped or damaged during transportation, assembly, and other processes. This fully utilizes the space at the ends and sides of the electrode assembly 1, improving space utilization and making the battery structure more compact. The electrode assembly 1 is snapped into the first cover plate body 21, the second cover plate body 22, and the housing 3, which improves the connection stability between the electrode assembly 1 and the cover plate assembly 2 and the housing 3, preventing damage and movement of the electrode assembly 1 during installation and enhancing battery safety.

[0027] It is understandable that the explosion-proof valve 4 can also be installed on the first cover plate body 21. The installation position of the explosion-proof valve 4 can be adjusted according to actual needs, and will not be listed in detail here.

[0028] See Figure 4 In some embodiments, a first mounting groove 11 is formed at the corner of the electrode group 1. The first mounting groove 11 includes a first part 111 and a second part 112. The first part 111 is disposed at the end of the electrode group 1, and the second part 112 is disposed on the side of the electrode group 1 in the third direction Z. A first electrode tab 13 is disposed in the first part 111 and the second part 112. The second mounting groove 12 extends along the first direction X. The second mounting grooves 12 of the two electrode groups 1 are joined together to form a space for accommodating the second electrode tab 14.

[0029] In this embodiment, see Figures 4 to 7 The first part 111 and the second part 112 are connected. The first assembly groove 11 is L-shaped and the second assembly groove 12 is a straight groove. Correspondingly, the first electrode ear 13 is L-shaped and the second electrode ear 14 is rectangular. The cover plate assembly 2 also includes a first welding block 24, a second welding block 25, a first plastic 26 and a second plastic 27. The first welding block 24 is disposed on the side of the first cover plate body 21 or the second cover plate body 22 away from the electrode group 1. The second welding block 25 is disposed on the side of the first cover plate body 21 or the second cover plate body 22 facing the electrode group 1. The first plastic 26 is disposed between the first welding block 24 and the corresponding first cover plate body 21 or the second cover plate body 22. The second plastic 27 is disposed between the second welding block 25 and the corresponding first cover plate body 21 or the second cover plate body 22. The surface of the first cover plate body 21 away from the electrode group 1 protrudes from the first welding block 24 located in the first assembly groove 11. The surface of the housing 3 in the third direction Z protrudes from the first welding block 24 located in the second assembly groove 12.

[0030] Thus, the arrangement of the first tab 13 and the second tab 14 can improve the battery's overcurrent capacity, increase the space utilization of the end and side of the electrode group 1, and provide sufficient assembly space at the cover plate assembly 2 to facilitate the connection of the battery with other batteries or external circuits, thereby increasing the battery assembly ratio and grouping rate. It can also improve the protection effect on the pole post 23 and the first welding block 24, as well as the connection stability between the electrode group 1 and the cover plate body, and improve the structural strength of the battery.

[0031] It is understood that the first assembly groove 11 can also be a straight groove. In this embodiment, the first assembly groove 11 is L-shaped in order to increase the length of the first electrode 13 and thus improve the flow capacity. The shapes of the first assembly groove 11 and the second assembly groove 12 can be adjusted according to actual needs, and will not be listed in detail here.

[0032] See Figure 8 and Figure 9 In some embodiments, along the third direction Z, the width of the pole group 1 is A, the width of the pole group 1 corresponding to the bottom wall position of the first part 111 is L2, and satisfies 0.5≤L2 / A≤0.75, and the width of the protrusion 15 is L3, and satisfies 0.5≤L3 / A≤0.75.

[0033] In this embodiment, the pole post 23 located in the first assembly groove 11 is disposed in the first part 111. The ratio of the width L2 of the pole group 1 corresponding to the bottom wall position of the first part 111 to the width A of the pole group 1 can be any value between 0.5 and 0.75 or any range between any two values, such as 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, etc.; the ratio of the width L3 of the protrusion 15 to the width A of the pole group 1 can be any value between 0.5 and 0.75 or any range between any two values, such as 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, etc.

[0034] Thus, the first assembly slot 11 has enough space to assemble the pole post 23 and the first welding block 24, avoiding assembly interference with the end of the pole group 1, improving the connection stability between the cover plate assembly 2 and the pole group 1, and preventing damage and movement of the pole group 1 during the casing process; the protrusion 15 leaves a distance from the side of the pole group 1 in the third direction Z, which can increase the power while providing sufficient assembly space on the side of the pole group 1 to assemble the second cover plate body 22, improving space utilization and thus increasing the battery assembly ratio.

[0035] Understandably, the ratio of the width L2 of the electrode assembly 1 corresponding to the bottom wall position of the first part 111 to the width A of the electrode assembly 1 cannot be too small. If it is too small, the end size of the electrode assembly 1 will be reduced, which is not conducive to improving the battery capacity. The ratio of the width L2 of the electrode assembly 1 corresponding to the bottom wall position of the first part 111 to the width A of the electrode assembly 1 cannot be too large either. If it is too large, it will reduce the space of the first assembly groove 11, which is not conducive to assembling the cover plate assembly 2. The ratio of the width L3 of the protrusion 15 to the width A of the electrode assembly 1 cannot be too small either. If it is too small, it will reduce the volume of the protrusion 15 and reduce the connection strength between the electrode assembly 1 and the housing 3. The ratio of the width L3 of the protrusion 15 to the width A of the electrode assembly 1 cannot be too large either. If it is too large, it will cause assembly interference with the second cover plate body 22 and increase the battery size, affecting the space utilization rate.

[0036] See Figure 4 and Figure 8 In some embodiments, along the first direction X, the distance between the second part 112 groove wall and the first part 111 groove wall is H1, and satisfies 12mm≤H1≤80mm. The distance between the first part 111 groove wall and the end face of the pole group 1 where the first assembly groove 11 is opened is H2, and satisfies 10mm≤H2≤40mm.

[0037] In this embodiment, the first cover plate body 21 includes a snap-fit ​​part 211, a bending part 212, and a connecting part 213. The snap-fit ​​part 211 is snap-fitted to the protrusion 15. The bending part 212 is provided corresponding to the first assembly groove 11. The connecting part 213 is connected to one end of the bending part 212 corresponding to the second part 112. The distance H1 between the groove wall of the second part 112 and the groove wall of the first part 111 can be any value between 12mm and 80mm or any range between any two values, such as 12mm, 20mm, 40mm, 60mm, 80mm, etc. The distance H2 between the groove wall of the first part 111 and the end face of the pole group 1 where the first assembly groove 11 is opened (that is, the length of the end of the pole group 1 protruding from the first assembly groove 11) can be any value between 10mm and 40mm or any range between any two values, such as 10mm, 20mm, 30mm, 40mm, etc.

[0038] Thus, the position of the first cover plate body 21 corresponding to the first assembly groove 11 can be stably engaged with the electrode group 1, improving the connection stability between the cover plate assembly 2 and the electrode group 1, thereby improving the structural strength of the battery and making the battery structure more compact, increasing the battery assembly ratio. Setting the first assembly groove 11 at the end of the electrode group 1 facilitates the assembly of the cover plate assembly 2 and the connection of the battery with other batteries or external circuits.

[0039] Understandably, the distance H1 between the second part 112 groove wall and the first part 111 groove wall cannot be too small, otherwise the length of the second part 112 will be too small, increasing the difficulty of processing and assembly. The distance H1 between the second part 112 groove wall and the first part 111 groove wall cannot be too large, otherwise the volume of the electrode group 1 will be reduced, which is not conducive to the improvement of the power. The distance H2 between the first part 111 groove wall and the end face of the electrode group 1 where the first assembly groove 11 is opened cannot be too small, otherwise the protection effect on the pole post 23 and the first welding block 24 located in the first assembly groove 11 will be reduced. The distance H2 between the first part 111 groove wall and the end face of the electrode group 1 where the first assembly groove 11 is opened cannot be too large, otherwise it will affect the space utilization rate of the end of the electrode group 1.

[0040] See Figure 8 In some embodiments, the end of the electrode assembly 1 is provided with an inclined surface 16, which is located on one side of the first assembly groove 11. The width of the end of the electrode assembly 1 is smaller than the width of the electrode assembly 1 at the location where the first assembly groove 11 is opened.

[0041] In this embodiment, the end of the electrode group 1 has a right-angled trapezoidal structure.

[0042] Thus, by providing an inclined surface 16 at the end of the electrode assembly 1, it is possible to guide the first cover plate body 21 to be quickly positioned to the electrode assembly 1, thereby improving assembly efficiency. It also limits the relative position of the first cover plate body 21 and the electrode assembly 1, allowing for more assembly space at the first assembly groove 11. This facilitates the assembly of the terminal post 23 and the connection of the battery to the external circuit, thereby improving the structural compactness of the battery.

[0043] See Figure 8 In some embodiments, along the third direction Z, the width of the end of the pole group 1 is L1, the width of the pole group 1 corresponding to the bottom wall position of the first part 111 is L2, and the condition 0.75≤L1 / L2≤0.9 is satisfied. The angle between the inclined surface 16 and the end face of the pole group 1 at the end where the first assembly groove 11 is opened is N, and the condition 25°≤N≤60° is satisfied.

[0044] In this embodiment, the ratio of the width L1 at the end of the pole group 1 to the width L2 at the bottom wall position of the pole group 1 corresponding to the first part 111 can be any value between 0.75 and 0.9 or any range between any two values, such as 0.75, 0.8, 0.85, 0.9, etc.; the included angle N between the inclined surface 16 and the end face of the pole group 1 at the end where the first assembly groove 11 is opened can be any value between 25° and 60° or any range between any two values, such as 25°, 30°, 40°, 50°, 60°, etc.

[0045] In this way, not only can the protection effect of the pole post 23 set in the first assembly groove 11 be improved, but the connection strength between the pole group 1 and the first cover plate body 21 can also be improved, the assembly effect of the cover plate assembly 2 can be improved, and the pole piece or the first pole lug 13 can be prevented from being damaged or moving during the process of the pole group 1 entering the shell. The inclined surface 16 can improve the assembly efficiency of the cover plate assembly 2, reduce the damage that occurs during the assembly process, and improve the structural strength of the first cover plate body 21 that is fitted to it, so as to prevent the first cover plate body 21 from being deformed by external force.

[0046] Understandably, the ratio of the width L1 at the end of the electrode group 1 to the width L2 at the bottom wall position of the electrode group 1 corresponding to the first part 111 cannot be too small. If it is too small, it will reduce the volume of the electrode group 1 and affect the increase in power. The ratio of the width L1 at the end of the electrode group 1 to the width L2 at the bottom wall position of the electrode group 1 corresponding to the first part 111 cannot be too large. If it is too large, it will encroach on the space of the first assembly slot 11, which is not conducive to the assembly of the cover plate assembly 2.

[0047] See Figure 8 In some embodiments, the protrusion 15 extends along the first direction X, and the end face of the protrusion 15 facing away from the second mounting groove 12 is flush with the end face of the pole group 1 at the end where the second pole tab 14 is disposed.

[0048] In this embodiment, the end face of the protrusion 15 facing the second mounting groove 12 is spaced apart from the end face of the pole group 1, and the protrusion 15 is symmetrically arranged on two surfaces of the pole group 1 in the second direction Y.

[0049] Thus, the housing 3 and the protrusion 15 are fitted together, which improves the connection stability between the housing 3 and the electrode assembly 1, prevents the electrode assembly 1 from shifting within the housing 3, improves battery safety, and makes full use of the space of the electrode assembly 1 in the second direction Y, avoiding assembly interference with the second cover plate body 22. This also improves the space utilization rate of the side of the electrode assembly 1.

[0050] It is understandable that the shape and position of the protrusion 15 can be adjusted according to actual needs, which will not be elaborated here.

[0051] See Figure 8 In some embodiments, the first assembly groove 11 and the second assembly groove 12 are disposed on the same side of the pole group 1 in the second direction Y.

[0052] This facilitates the assembly of the cover plate assembly 2 to the electrode group 1, improves assembly efficiency, and provides sufficient assembly space on one side of the electrode group 1 to allow the battery to be connected to other batteries or external circuits, thereby increasing the battery assembly ratio.

[0053] It is understandable that the first assembly slot 11 and the second assembly slot 12 can also be respectively set on both sides of the pole group 1 in the third direction Z. The setting positions of the first assembly slot 11 and the second assembly slot 12 can be adjusted according to actual needs, and will not be listed in detail here.

[0054] See Figure 8 and Figure 10 In some embodiments, along the third direction Z, the depth of the second assembly groove 12 is F, 10mm≤F≤35mm, and along the second direction Y, the sum of the height of the protrusion 15 and the height of the pole group 1 is B2, the height of the pole group 1 is B1, and satisfies 10mm≤B2-B1≤60mm.

[0055] In this embodiment, the depth F of the second assembly groove 12 can be any value between 10mm and 35mm or any range between two values, such as 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, etc.; the difference between the sum of the height of the protrusion 15 and the height of the pole group 1, B2, and the height of the pole group 1, B1 (that is, the sum of the heights of the protrusions 15 on both sides), can be any value between 10mm and 60mm or any range between two values, such as 10mm, 20mm, 30mm, 40mm, 50mm, 60mm, etc.

[0056] In this way, the second assembly slot 12 has enough space to assemble the cover plate assembly 2 and avoids assembly interference with the protrusion 15, improving space utilization and ensuring stable engagement between the electrode assembly 1 and the second cover plate body 22 and the housing 3, thereby improving battery safety.

[0057] Understandably, the depth F of the second assembly groove 12 cannot be too small, as this would result in insufficient assembly space. Conversely, the depth F of the second assembly groove 12 cannot be too large, as this would reduce the size of the electrode assembly 1, which would be detrimental to increasing the battery capacity. The difference between the sum of the height of the protrusion 15 and the height of the electrode assembly 1, B2, and the height of the electrode assembly 1, B1, cannot be too small, as this would reduce the volume of the protrusion 15 and decrease the connection strength between the protrusion 15 and the housing 3. The difference between the sum of the height of the protrusion 15 and the height of the electrode assembly 1, B2, and the height of the electrode assembly 1, B1, cannot be too large, as this would increase the overall size of the battery.

[0058] See Figure 8 and Figure 10 In some embodiments, along the first direction X, the length of the second mounting groove 12 is W2, the length of the pole group 1 is E, and 0.15≤W2 / E≤0.33 is satisfied, the length of the protrusion 15 is W1, and 10mm≤E-W1≤60mm is satisfied.

[0059] In this embodiment, the ratio of the length W2 of the second assembly groove 12 to the length E of the pole group 1 can be any value between 0.15 and 0.33 or any range between any two values, such as 0.15, 0.2, 0.25, 0.3, 0.33, etc.; the difference between the length E of the pole group 1 and the length W1 of the protrusion 15 can be any value between 10mm and 60mm or any range between any two values, such as 10mm, 20mm, 30mm, 40mm, 50mm, 60mm, etc.

[0060] In this way, the second assembly groove 12 and the protrusion 15 can be spaced apart to avoid assembly interference, making the battery structure more compact and giving the second tab 14 sufficient strength, improving the battery's overcurrent capacity and battery power, improving the protection effect on the pole post 23 and the second welding block 25 located in the second assembly groove 12, avoiding bumps and damage during transportation, assembly and other processes, and improving the battery's safety.

[0061] Understandably, the ratio of the length W2 of the second assembly groove 12 to the length E of the electrode group 1 cannot be too small, otherwise it will reduce the length of the second electrode tab 14 and reduce the current carrying capacity. The ratio of the length W2 of the second assembly groove 12 to the length E of the electrode group 1 cannot be too large, otherwise it will reduce the volume of the electrode group 1 and will not be conducive to the increase of the power capacity. The difference between the length E of the electrode group 1 and the length W1 of the protrusion 15 cannot be too small, otherwise it will lead to an increase in the battery size. The difference between the length E of the electrode group 1 and the length W1 of the protrusion 15 cannot be too large, otherwise it will reduce the volume of the protrusion 15 and reduce the connection strength between the electrode group 1 and the housing 3 and the first cover plate body 21.

[0062] To verify the rationality of the following ratios: the width L2 of pole group 1 corresponding to the bottom wall position of the first part 111, which is the ratio of the width A of pole group 1; the width L1 of the end of pole group 1, which is the ratio of the width L2 of the bottom wall position of the first part 111, which is the ratio of the distance H1 between the second part 112 groove wall and the first part 111 groove wall; the distance H2 between the first part 111 groove wall and the end face of pole group 1 where the first assembly groove 11 is opened; the width L3 of protrusion 15, which is the ratio of the width A of pole group 1; the depth F of second assembly groove 12; the length W2 of second assembly groove 12, which is the ratio of the length E of pole group 1; the difference between the sum B2 of the height of protrusion 15 and the height of pole group 1 and the height B1 of pole group 1; the angle N between the inclined surface 16 and the end face of pole group 1 where the first assembly groove 11 is opened; and the difference range between the length E of pole group 1 and the length W1 of protrusion 15, as shown in Table 1, this embodiment provides six sets of embodiments and six sets of comparative examples for illustration.

[0063] Table 1 As shown in Examples 1 to 6 of Table 1, after meeting the range limitations, the battery yield meets the requirements, and no abnormalities such as positioning deviations or poor structural strength are found in electrode assembly 1, cover assembly 2, or shell 3. The tabs and electrode assembly 1 are undamaged and undeformed, and the battery temperature and the venting speed of the explosion-proof valve 4 meet the battery requirements.

[0064] As can be seen from Comparative Example 1, when the ratio of the width L1 at the end of electrode group 1 to the width L2 at the bottom wall position of the first part 111 of electrode group 1 is too small, the battery yield does not meet the requirements, the size of the end of electrode group 1 is insufficient, the size of the corresponding protrusion 15 is reduced, and the increase in battery capacity is reduced.

[0065] As can be seen from Comparative Example 2, when the ratio of the width L1 at the end of electrode group 1 to the width L2 at the bottom wall position of the first part 111 of electrode group 1 is too large, the battery yield does not meet the requirements. The size of the end of electrode group 1 is too large, which increases the stamping difficulty of the cover plate, increases the forming cost of the cover plate, and reduces the assembly efficiency.

[0066] As can be seen from Comparative Example 3, when the ratio of the width L3 of the protrusion 15 to the width A of the electrode group 1 is too small, the battery yield does not meet the requirements. The width ratio of the protrusion 15 is insufficient, the size of the electrode group 1 is reduced, and the increase in battery capacity is reduced.

[0067] As can be seen from Comparative Example 4, when the ratio of the width L3 of the protrusion 15 to the width A of the electrode group 1 is too large, the battery yield does not meet the requirements. The excessive width of the protrusion 15 increases the difficulty of forming the shell 3 and the second cover plate body 22, increases the cost of parts, and reduces the assembly efficiency.

[0068] As can be seen from Comparative Example 5, when the ratio of the length W2 of the second assembly slot 12 to the length E of the electrode group 1 is too small, the battery yield does not meet the requirements, the size of the second electrode tab 14 is insufficient, which reduces the battery's overcurrent capacity, venting effect, cooling effect, and battery safety performance.

[0069] As can be seen from Comparative Example 6, when the ratio of the length W2 of the second assembly groove 12 to the length E of the electrode group 1 is too large, the battery yield does not meet the requirements, the size of the second tab 14 is too large, the size of the electrode group 1 is reduced, which affects the increase in battery capacity and reduces the strength of the side wall structure of the electrode group 1.

[0070] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A battery, characterized by, include: Two pole groups (1) are arranged along a first direction (X). The ends of the two pole groups (1) that are far apart from each other are provided with a first mounting groove (11), and the ends of the two pole groups (1) that are close to each other are provided with a second mounting groove (12). The pole group (1) is provided with a first electrode tab (13) and a second electrode tab (14). The first electrode tab (13) is provided in the first mounting groove (11), and the second electrode tab (14) is provided in the second mounting groove (12). The surface of the pole group (1) in the second direction (Y) is provided with a protrusion (15). The cover plate assembly (2) includes a first cover plate body (21), a second cover plate body (22), and a plurality of pole posts (23). The first cover plate body (21) is disposed corresponding to the first assembly groove (11), and the second cover plate body (22) is disposed corresponding to the second assembly groove (12). The pole post (23) disposed in the first assembly groove (11) is electrically connected to the first electrode tab (13), and the pole post (23) disposed in the second assembly groove (12) is electrically connected to the second electrode tab (14). Along the first direction (X), the surface of the first cover plate body (21) facing away from the pole group (1) protrudes from the pole post (23). The housing (3) is snapped into the electrode assembly (1). The first cover plate body (21), the second cover plate body (22) and the housing (3) enclose a space for accommodating the electrode assembly (1). Along the third direction (Z), the surface of the housing (3) facing away from the electrode assembly (1) protrudes from the electrode post (23) in the second assembly groove (12). The first direction (X) is the thickness direction of the first cover plate body (21), the second direction (Y) is the width direction of the first cover plate body (21), and the third direction (Z) is the length direction of the first cover plate body (21).

2. The battery of claim 1, wherein, The first mounting groove (11) is formed at the corner of the pole group (1). The first mounting groove (11) includes a first part (111) and a second part (112). The first part (111) is disposed at the end of the pole group (1), and the second part (112) is disposed on the side of the pole group (1) in the third direction (Z). The first electrode tab (13) is disposed in the first part (111) and the second part (112); and / or, the second mounting groove (12) extends along the first direction (X). The second mounting grooves (12) of the two pole groups (1) are joined together to form a space for accommodating the second electrode tab (14).

3. The battery of claim 2, wherein, Along the third direction (Z), the width of the pole group (1) is A, the width of the pole group (1) corresponding to the bottom wall position of the first part (111) is L2, and satisfies 0.5≤L2 / A≤0.75; and / or, the width of the protrusion (15) is L3, and satisfies 0.5≤L3 / A≤0.

75.

4. The battery of claim 2, wherein, Along the first direction (X), the distance between the second part (112) groove wall and the first part (111) groove wall is H1, and satisfies 12mm≤H1≤80mm; and / or, the distance between the first part (111) groove wall and the end face of the pole group (1) where the first assembly groove (11) is opened is H2, and satisfies 10mm≤H2≤40mm.

5. The battery of claim 2, wherein, The end of the pole group (1) is provided with an inclined surface (16), which is located on one side of the first assembly groove (11). The width of the end of the pole group (1) is smaller than the width of the position where the pole group (1) opens the first assembly groove (11).

6. The battery according to claim 5, characterized in that, Along the third direction (Z), the width of the end of the pole group (1) is L1, the width of the pole group (1) corresponding to the bottom wall position of the first part (111) is L2, and satisfies 0.75≤L1 / L2≤0.9; and / or, the angle between the inclined surface (16) and the end face of the pole group (1) at the end where the first assembly groove (11) is opened is N, and satisfies 25°≤N≤60°.

7. The battery of claim 1, wherein, The protrusion (15) extends along the first direction (X), and the end face of the protrusion (15) facing away from the second mounting groove (12) is flush with the end face of the pole group (1) at the end where the second pole tab (14) is located.

8. The battery according to claim 1, characterized in that, The first assembly slot (11) and the second assembly slot (12) are disposed on the same side of the pole group (1) in the second direction (Y).

9. The battery according to any one of claims 1 to 8, characterized in that, Along the third direction (Z), the depth of the second assembly groove (12) is F, 10mm≤F≤35mm; and / or, along the second direction (Y), the sum of the height of the protrusion (15) and the height of the pole group (1) is B2, the height of the pole group (1) is B1, and satisfies 10mm≤B2-B1≤60mm.

10. The battery of any one of claims 1-8, wherein, Along the first direction (X), the length of the second assembly groove (12) is W2, the length of the pole group (1) is E, and 0.15≤W2 / E≤0.33 is satisfied; and / or, the length of the protrusion (15) is W1, and 10mm≤E-W1≤60mm is satisfied.

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