A battery

Abstract

This invention belongs to the field of battery technology and discloses a battery including two electrode groups arranged along a first direction, a cover plate assembly, and a housing. The two electrode groups are electrically connected, and each electrode group has two tabs connected to its end. Each electrode group also has a first mounting portion connected to its end. The two tabs are respectively spaced apart on both sides of the first mounting portion in a third direction. The cover plate assembly includes a cover plate body and terminal posts. The cover plate body has a snap-fit ​​portion corresponding to the position of the first mounting portion, allowing the cover plate body to snap-fit ​​with the electrode groups. The terminal posts are disposed on the cover plate body, and each tab is connected to at least one terminal post. Along the first direction, the snap-fit ​​portion protrudes from the surface of the electrode groups and is positioned away from the terminal posts. The first mounting portion extends along a second direction. The housing is connected to the cover plate body and encloses a space for accommodating the electrode groups. This design improves the battery's capacity and assembly ratio, making the battery structure more compact and increasing its structural strength.

Description

Technical Field

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

[0002] With the rapid development of industries such as portable electronic devices, power tools, and new energy vehicles, higher requirements have been placed on the energy density, rate performance, and safety performance of battery products.

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

[0004] However, the cover plate is usually a flat structure, with the poles and rivet blocks protruding from the cover plate. During transportation, assembly and other processes, they are easily bumped and damaged, resulting in poor protection, affecting battery yield and safety. Furthermore, the connection stability between the pole group and the cover plate assembly is poor. When pushing the pole group into the shell, the pole sheets are easily damaged and shift. The structural strength of the cover plate is low and it is easy to deform. The space utilization between the cover plate and the pole group is low, which is not conducive to improving battery capacity and assembly ratio. Summary of the Invention

[0005] The purpose of this invention is to provide a battery that solves the problems of poor strength of the cover plate structure, poor protection of the terminals, and low 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, electrically connected, with two tabs connected to the ends of each electrode group, and a first mounting portion connected to the ends of each electrode group; the two tabs being spaced apart on both sides of the first mounting portion in a third direction; a cover plate assembly including a cover plate body and a terminal post; the cover plate body having a snap-fit ​​portion corresponding to the position of the first mounting portion to snap-fit ​​the cover plate body with the electrode group; the terminal post being disposed on the cover plate body; the tabs being connected to at least one terminal post; the snap-fit ​​portion protruding from the terminal post away from the surface of the electrode group along the first direction; and the first mounting portion extending along a second direction; and a housing connected to the cover plate body and enclosing a space for accommodating the electrode groups; the first direction being the thickness direction of the cover plate body, the second direction being the length direction of the cover plate body, and the third direction being the width direction of the cover plate body.

[0007] Preferably, the cover plate assembly further includes a first connecting plate and a second connecting plate. The first connecting plate is disposed on the side of the cover plate body away from the electrode group, and the second connecting plate is disposed on the side of the cover plate body facing the electrode group. The electrode post passes through the first connecting plate, the cover plate body and the second connecting plate in sequence, and the second connecting plate is connected to the electrode tab.

[0008] Preferably, along the first direction, the distance between the surface of the snap-fit ​​portion facing away from the pole group and the surface of the first connecting plate facing away from the pole group is H1, and satisfies 6mm≤H1≤35mm; and / or, the total height of the cover plate body is H2, and satisfies 25mm≤H2≤60mm.

[0009] Preferably, the electrode assembly has a first protrusion and a second protrusion connected to its side in the third direction, and a third protrusion connected to its side in the second direction, wherein the first protrusion, the second protrusion and the third protrusion all extend along the first direction.

[0010] Preferably, along the third direction, the width of the cover plate body corresponding to the position of the electrode group is B1, the total width of the cover plate body is B2, and satisfies 16mm≤B2-B1≤70mm; and / or, the end of the electrode group is connected to a second assembly part, the second assembly part is connected to the side of the first assembly part in the third direction, and along the third direction, the width of the cover plate body corresponding to the position of the second assembly part is W1, and satisfies 20mm≤B1-W1≤70mm.

[0011] Preferably, along the third direction, the width of the cover plate body corresponding to the pole group position is B1, the width of the cover plate body corresponding to the first assembly position is W2, and satisfies 0.3≤W2 / B1≤0.55; and / or, along the second direction, the width of the cover plate body corresponding to the second protrusion position is L1, the total length of the cover plate body is A, and satisfies 0.33≤L1 / A≤0.7.

[0012] Preferably, the snap-fit ​​portion includes a plug and a side, the side being disposed around the side of the first assembly portion, and the plug being disposed on the side of the first assembly portion away from the electrode assembly and being disposed together with the side to form a space for accommodating the first assembly portion.

[0013] Preferably, the thickness of the plug is T1, and satisfies 1mm≤T1≤3.5mm; and / or, the thickness of the side is T2, and satisfies 1.5mm≤T2≤2.5mm.

[0014] Preferably, the end of the housing facing the cover plate body is provided with a positioning protrusion, and the cover plate body is provided with a corresponding groove, so that the housing and the cover plate body are engaged.

[0015] Preferably, along the first direction, the depth of the groove is E, and satisfies 4mm≤E≤10mm; and / or, the groove is inclined on the side in the third direction, and the included angle between the two sides of the groove in the third direction is N, and satisfies 10°≤N≤80°.

[0016] The beneficial effects of this invention are: A battery includes two electrode groups arranged along a first direction, a cover assembly, and a housing. The two electrode groups are electrically connected, and two tabs are connected to the ends of the electrode groups. A first mounting portion is also connected to the ends of the electrode groups. The two tabs are respectively spaced apart on both sides of the first mounting portion in a third direction. The cover assembly includes a cover body and a terminal post. The cover body has a snap-fit ​​portion corresponding to the position of the first mounting portion to snap-fit ​​the cover body to the electrode group. The terminal post is disposed on the cover body, and the tab is connected to at least one terminal post. Along the first direction, the snap-fit ​​portion protrudes from the surface of the electrode group and is disposed on the terminal post. The first mounting portion extends along a second direction. The housing is connected to the cover body and encloses a space for accommodating the electrode groups. The first direction is the thickness direction of the cover body, the second direction is the length direction of the cover body, and the third direction is the width direction of the cover body.

[0017] In this way, the first assembly section can increase the battery's capacity and improve the connection stability between the electrode assembly and the cover plate assembly, avoid the electrode posts from being bumped and damaged during transportation, assembly and other processes, improve battery yield and safety, ensure that the electrode tabs have sufficient length, increase the current flow area, save battery assembly space, improve space utilization, make the battery structure more compact, facilitate the connection of multiple batteries, improve the packing rate and positioning strength. 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 pole group structure in one embodiment of the present invention; Figure 3 This is an exploded view of the housing in one embodiment of the present invention; Figure 4 This is a schematic diagram of the first structure of the cover plate assembly in one embodiment of the present invention; Figure 5 This is a schematic diagram of the second structure of the cover plate assembly in one embodiment of the present invention; Figure 6 This is a first exploded view of the cover plate assembly in one embodiment of the present invention; Figure 7This is a second exploded view of the cover plate assembly in one embodiment of the present invention; Figure 8 This is a front view of a cover plate assembly according to an embodiment of the present invention; Figure 9 This is a top view of a cover plate assembly according to an embodiment of the present invention; Figure 10 This is one embodiment of the present invention. Figure 9 AA section view; Figure 11 This is one embodiment of the present invention. Figure 9 BB section view; Figure 12 This is a schematic diagram of the plug structure in one embodiment of the present invention.

[0019] In the picture: 1. Pole assembly; 11. Pole lug; 12. First assembly part; 13. First protrusion; 14. Second protrusion; 15. Third protrusion; 16. Second assembly part; 2. Cover plate assembly; 21. Cover plate body; 211. Snap-fit ​​part; 2111. Plug; 2112. Side; 212. Groove; 22. Pole post; 23. First connecting plate; 24. Second connecting plate; 25. First plastic; 26. Second plastic; 3. Housing; 31. Half-shell; 311. Positioning protrusion; 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 4 The present invention provides a battery comprising two electrode groups 1 arranged along a first direction X, a cover plate assembly 2, and a housing 3. The two electrode groups 1 are electrically connected, and two tabs 11 are connected to the ends of the electrode groups 1. A first mounting part 12 is also connected to the ends of the electrode groups 1. The two tabs 11 are respectively spaced apart on both sides of the first mounting part 12 in a third direction Z. The cover plate assembly 2 includes a cover plate body 21 and a terminal post 22. The cover plate body 21 is provided with a snap-fit ​​part 211 corresponding to the position of the first mounting part 12, so that the cover plate body 21 and the terminal post 22 are engaged. The electrode assembly 1 is snap-fitted together, the electrode post 22 is disposed on the cover plate body 21, the electrode tab 11 is connected to at least one electrode post 22, along the first direction X, the snap-fit ​​portion 211 is disposed opposite to the surface of the electrode assembly 1 and protrudes from the electrode post 22, and the first assembly portion 12 extends along the second direction Y; the housing 3 is connected to the cover plate body 21 and encloses it to form a space for accommodating the electrode assembly 1; the first direction X is the thickness direction of the cover plate body 21, the second direction Y is the length direction of the cover plate body 21, and the third direction Z is the width direction of the cover plate body 21.

[0025] In this embodiment, both electrode groups 1 extend along the first direction X. A conductive coating (not shown in the figure) is provided on the end faces of the two electrode groups 1 that are close to each other to achieve electrical connection between the two electrode groups 1. Two second assembly parts 16 are also connected to the ends of the electrode groups 1. The two second assembly parts 16 are respectively disposed on both sides of the first assembly part 12 in the third direction Z. The first assembly part 12 and the second assembly part 16 form a cross-shaped structure. Both the first assembly part 12 and the second assembly part 16 are integrally formed with the electrode groups 1. The height of the pole group 1 is the same. The pole lug 11 is arranged around the second assembly part 16. The shape of the cover plate body 21 is adapted to the shape of the first assembly part 12 and the second assembly part 16 so that the cover plate body 21 is fitted to the end of the pole group 1. The end of the pole group 1 is provided with four pole posts 22. The pole lug 11 is provided with one pole post 22 at each end. The housing 3 includes two half-shells 31 for accommodating two pole groups 1 respectively. The two half-shells 31 are fixedly and sealed together by welding.

[0026] Thus, the first assembly part 12 and the second assembly part 16 can not only increase the battery's capacity, but also engage with the cover plate body 21, improving the connection stability between the electrode group 1 and the cover plate body 21. The first assembly part 12 and the second assembly part 16 can protect the electrode posts 22 located on both sides of the first assembly part 12, preventing bumps and damage during transportation, assembly and other processes. They can also ensure that the electrode tabs 11 have sufficient length, increasing the current flow area, saving battery assembly space, facilitating the connection of multiple batteries, improving the grouping rate and positioning strength.

[0027] See Figures 4 to 7 In some embodiments, the cover plate assembly 2 further includes a first connecting plate 23 and a second connecting plate 24. The first connecting plate 23 is disposed on the side of the cover plate body 21 away from the electrode group 1, and the second connecting plate 24 is disposed on the side of the cover plate body 21 facing the electrode group 1. The electrode post 22 is disposed through the first connecting plate 23, the cover plate body 21 and the second connecting plate 24 in sequence. The second connecting plate 24 is connected to the electrode tab 11 to realize the electrical connection between the electrode tab 11 and the electrode post 22.

[0028] In this embodiment, the first connecting plate 23 and the second connecting plate 24 are both corresponding to the electrode tabs 11. The shapes of the first connecting plate 23 and the second connecting plate 24 are adapted to the shapes of the first assembly part 12 and the end faces of the electrode groups 1 on both sides. The snap-fit ​​part 211 protrudes from the surface of the electrode group 1 away from the first connecting plate 23 away from the surface of the electrode group 1. The cover plate assembly 2 also includes a first plastic 25 and a second plastic 26. The first plastic 25 is disposed between the first connecting plate 23 and the cover plate body 21, and the shape of the first plastic 25 is adapted to the shape of the first connecting plate 23. The second plastic 26 is disposed between the second connecting plate 24 and the cover plate body 21, and the shape of the second plastic 26 is adapted to the shape of the cover plate body 21. This makes the first connecting plate 23 and the second connecting plate 24 insulated from the cover plate body 21 while improving the structural strength of the cover plate assembly 2.

[0029] Thus, by setting the first connecting plate 23 and the second connecting plate 24, the welding area of ​​the battery can be increased and the current carrying capacity of the cover plate assembly 2 can be improved, making it easier to assemble the pole post 22 to the cover plate body 21. By setting the first connecting plate 23 and the second connecting plate 24 on both sides of the first assembly part 12, the end space of the pole group 1 can be fully utilized, improving the space utilization rate, making the battery structure more compact, and increasing the battery capacity and assembly ratio.

[0030] It is understandable that the number of the first connecting plate 23 and the second connecting plate 24 can be adjusted according to the number and setting position of the pole post 22, which will not be elaborated here.

[0031] See Figure 8 In some embodiments, along the first direction X, the distance between the surface of the snap-fit ​​portion 211 away from the electrode group 1 and the surface of the first connecting plate 23 away from the electrode group 1 is H1, and satisfies 6mm≤H1≤35mm, and the total height of the cover plate body 21 is H2, and satisfies 25mm≤H2≤60mm.

[0032] In this embodiment, the distance H1 between the surface of the snap-fit ​​part 211 away from the electrode group 1 and the surface of the first connecting plate 23 away from the electrode group 1 (that is, the distance by which the snap-fit ​​part 211 protrudes from the first connecting plate 23) can be any value between 6mm and 35mm or any range between any two values, such as 6mm, 10mm, 20mm, 30mm, 35mm, etc.; the total height H2 of the cover plate body 21 can be any value between 25mm and 60mm or any range between any two values, such as 25mm, 30mm, 40mm, 50mm, 60mm, etc.

[0033] In this way, the snap-fit ​​part 211 and the first assembly part 12 can provide stable protection for the pole post 22 and the first connecting plate 23, avoid bumps and damage during transportation, assembly and other processes, improve battery yield and safety, and improve the structural strength of the cover plate body 21, so that it can provide protection for the pole group 1 after being welded to the shell 3, and avoid damage and movement of the pole group 1 when it is put into the shell.

[0034] Understandably, the distance H1 between the surface of the snap-fit ​​part 211 away from the electrode group 1 and the surface of the first connecting plate 23 away from the electrode group 1 cannot be too small. If it is too small, it will reduce the protection effect on the electrode post 22 and the first connecting plate 23. The distance H1 between the surface of the snap-fit ​​part 211 away from the electrode group 1 and the surface of the first connecting plate 23 away from the electrode group 1 cannot be too large. If it is too large, it will increase the overall volume of the battery and affect the space utilization rate. The total height H2 of the cover body 21 cannot be too small. If it is too small, it will reduce the accommodation space of the first assembly part 12 and the second assembly part 16, which is not conducive to the improvement of battery capacity. The total height H2 of the cover body 21 cannot be too large. If it is too large, it will be not conducive to the processing and forming of the cover body 21 and will occupy more space at the end of the electrode group 1.

[0035] See Figure 2 In some embodiments, the pole group 1 has a first protrusion 13 and a second protrusion 14 connected to its side in the third direction Z, and a third protrusion 15 connected to its side in the second direction Y. The first protrusion 13, the second protrusion 14 and the third protrusion 15 all extend along the first direction X.

[0036] In this embodiment, the first protrusion 13, the second protrusion 14, and the third protrusion 15 are all integrally formed with the electrode group 1 to improve the battery capacity. The end of the first protrusion 13 facing away from the cover plate body 21 is flush with the end face of the electrode group 1 facing the other electrode group 1. One end of the second protrusion 14 is connected to the end of the first protrusion 13 facing the cover plate body 21, and the other end is connected to the end of the electrode group 1 where the tab 11 is provided. The end of the third protrusion 15 facing away from the cover plate body 21 is flush with the end face of the electrode group 1 facing the other electrode group 1, and the other end is separated from the end face of the electrode group 1 where the tab 11 is provided. The first protrusion 13, the second protrusion 14, and the third protrusion 15 on the two electrode groups 1 are symmetrically arranged, and the height of the end of the third protrusion 15 facing the cover plate body 21 gradually decreases.

[0037] Thus, by setting the first protrusion 13, the second protrusion 14 and the third protrusion 15, the battery capacity and the structural strength of the side of the electrode assembly 1 can be improved, the electrode assembly 1 can be stably connected to the housing 3, and the position of the electrode assembly 1 in the housing 3 can be restricted to avoid damage and movement during the housing process. The space utilization of the side of the electrode assembly 1 can be improved, the battery structure can be made more compact, and a distance can be left with the cover plate assembly 2 to avoid assembly interference when assembling the cover plate assembly 2.

[0038] It is understandable that the shape and position of the first protrusion 13, the second protrusion 14 and the third protrusion 15 can be adjusted according to actual needs, which will not be elaborated here.

[0039] See Figure 8 and Figure 9 In some embodiments, along the third direction Z, the width of the cover body 21 corresponding to the position of the pole group 1 is B1, the total width of the cover body 21 is B2, and satisfies 16mm≤B2-B1≤70mm. The end of the pole group 1 is connected to a second assembly part 16 (see...). Figure 2 The second assembly part 16 is connected to the first assembly part 12 on the side in the third direction Z. Along the third direction Z, the width of the cover body 21 corresponding to the position of the second assembly part 16 is W1, and satisfies 20mm≤B1-W1≤70mm.

[0040] In this embodiment, the difference between the total width B2 of the cover plate body 21 and the width B1 of the cover plate body 21 corresponding to the position of the pole group 1 (that is, the sum of the heights of the two second protrusions 14 of the cover plate body 21) can be any value between 16mm and 70mm or any two values, such as 16mm, 20mm, 30mm, 50mm, 70mm, etc.; the difference between the width B1 of the cover plate body 21 corresponding to the position of the pole group 1 and the width W1 of the cover plate body 21 corresponding to the position of the second assembly part 16 can be any value between 20mm and 70mm or any two values, such as 20mm, 30mm, 50mm, 70mm, etc.

[0041] In this way, the second protrusion 14 can have sufficient height to improve its connection stability with the housing 3, and avoid damage and movement of the electrode assembly 1 during the housing process. The second assembly part 16 can improve the structural strength of the end of the electrode assembly 1 in the third direction Z, thereby improving the connection stability between the electrode assembly 1 and the cover plate body 21, improving the battery yield and safety, avoiding bumps and damage to the pole post 22 during transportation, assembly and other processes, and leaving sufficient assembly space on both sides to set the first connecting plate 23 and the pole post 22, which is conducive to connecting the battery with external circuits or other batteries, and improving the assembly rate and assembly ratio.

[0042] Understandably, the difference between the total width B2 of the cover body 21 and the width B1 of the cover body 21 corresponding to the position of the electrode group 1 cannot be too small. If it is too small, the height of the second protrusion 14 will be insufficient, affecting the improvement of battery capacity. The difference between the total width B2 of the cover body 21 and the width B1 of the cover body 21 corresponding to the position of the electrode group 1 cannot be too large. If it is too large, the height of the second protrusion 14 will be too large, which is not conducive to the forming of the shell 3. The difference between the width B1 of the cover body 21 corresponding to the position of the electrode group 1 and the width W1 of the cover body 21 corresponding to the position of the second assembly part 16 cannot be too small. If it is too small, the volume of the second assembly part 16 will be too small, which is not conducive to the improvement of battery capacity and the stable connection between the electrode group 1 and the cover body 21. The difference between the width B1 of the cover body 21 corresponding to the position of the electrode group 1 and the width W1 of the cover body 21 corresponding to the position of the second assembly part 16 cannot be too large. If it is too large, it will encroach on the assembly space on both sides of the first assembly part 12, which is not conducive to the assembly of the electrode post 22 and the first connecting plate 23.

[0043] See Figure 9 and Figure 10 In some embodiments, along the third direction Z, the cover body 21 corresponds to the first assembly part 12 (see...). Figure 2 The width of the position is W2, and satisfies 0.3≤W2 / B1≤0.55. Along the second direction Y, the cover plate body 21 corresponds to the second protrusion 14 (see...). Figure 2 The width of the position is L1, the total length of the cover plate body 21 is A, and the condition 0.33≤L1 / A≤0.7 is met.

[0044] In this embodiment, the second protrusion 14 is disposed in the middle of the surface of the electrode group 1 in the third direction Z. The ratio of the width W2 of the cover plate body 21 corresponding to the position of the first mounting part 12 to the width B1 of the cover plate body 21 corresponding to the position of the electrode group 1 can be any value between 0.3 and 0.55 or any range between any two values, such as 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, etc. The ratio of the width L1 of the cover plate body 21 corresponding to the position of the second protrusion 14 to the total length A of the cover plate body 21 can be any value between 0.33 and 0.7 or any range between any two values, such as 0.33, 0.4, 0.5, 0.6, 0.7, etc.

[0045] In this way, the first assembly part 12 and the second protrusion 14 can have sufficient width, which improves the battery capacity and the connection stability between the cover plate assembly 2 and the electrode group 1. The first assembly part 12 can improve the protection effect on the pole post 22 and the first connecting plate 23. The connection between the second protrusion 14 and the first protrusion 13 can increase the structural strength of the side of the electrode group 1. The assembly space reserved on both sides of the second protrusion 14 is conducive to the interconnection of multiple batteries.

[0046] Understandably, the ratio of the width W2 of the cover body 21 corresponding to the position of the first assembly part 12 to the width B1 of the cover body 21 corresponding to the position of the pole group 1 cannot be too small. If it is too small, the width of the first assembly part 12 will be small, which is not conducive to the increase of power. The ratio of the width W2 of the cover body 21 corresponding to the position of the first assembly part 12 to the width B1 of the cover body 21 corresponding to the position of the pole group 1 cannot be too large either. If it is too large, the assembly space on both sides of the first assembly part 12 will be insufficient, which will easily cause assembly interference. The ratio of the width L1 of the cover body 21 corresponding to the position of the second protrusion 14 to the total length A of the cover body 21 cannot be too small either. If it is too small, the width of the second protrusion 14 will be narrow, reducing the volume of the second protrusion 14, which is not conducive to the increase of power and reduces the limiting effect of the second protrusion 14. The ratio of the width L1 of the cover body 21 corresponding to the position of the second protrusion 14 to the total length A of the cover body 21 cannot be too large either. If it is too large, the second protrusion 14 will occupy too much space, affecting the space utilization rate.

[0047] See Figure 2 and Figure 11 In some embodiments, the snap-fit ​​portion 211 includes a plug 2111 and a side 2112. The side 2112 is disposed around the side of the first assembly portion 12, and the plug 2111 is disposed on the side of the first assembly portion 12 away from the electrode group 1 and is disposed together with the side 2112 to form a space for accommodating the first assembly portion 12.

[0048] In this embodiment, a step (not shown in the figure) is provided on the side of the side 2112 facing the plug 2111. The plug 2111 overlaps with the side 2112 to limit the relative position of the plug 2111 and the side 2112. The plug 2111 and the side 2112 are fixedly connected by welding. An explosion-proof valve 4 is provided on the plug 2111 to release gas in time when the battery experiences thermal runaway.

[0049] Thus, the snap-fit ​​portion 211 formed by the plug 2111 and the side 2112 can improve the protection effect on the first assembly portion 12 and the second assembly portion 16, avoid damage to the first assembly portion 12 and the second assembly portion 16, improve the connection stability between the electrode group 1 and the cover plate assembly 2 and the structural strength of the cover plate assembly 2, and prevent the cover plate assembly 2 from deforming during the assembly process. The explosion-proof valve 4 is set in the plug 2111, which can quickly release gas and improve battery yield and safety.

[0050] It is understandable that the plug 2111 and the side 2112 can also be integrally formed. In this embodiment, the plug 2111 and the side 2112 are fixedly connected by welding. This is to facilitate the assembly of the explosion-proof valve 4 to the plug 2111 first, and then connect the plug 2111 to the side 2112, thereby improving assembly efficiency. The connection method of the plug 2111 and the side 2112 can be adjusted according to actual needs, and will not be listed in detail here.

[0051] See Figure 11 and Figure 12 In some embodiments, the thickness of the plug 2111 is T1, and satisfies 1mm≤T1≤3.5mm, and the thickness of the side 2112 is T2, and satisfies 1.5mm≤T2≤2.5mm.

[0052] In this embodiment, the thickness of the plug 2111 is greater than the thickness of the side 2112. The thickness T1 of the plug 2111 can be any value between 1mm and 3.5mm or a range between any two values, such as 1mm, 2mm, 3mm, 3.5mm, etc. The thickness T2 of the side 2112 can be 1.5mm, 1.7mm, 1.9mm, 2.1mm, 2.3mm, 2.5mm, etc.

[0053] In this way, the structural strength of the connection between the plug 2111 and the side 2112 can be improved, the deformation of the plug 2111 and the side 2112 during the welding process can be avoided, the protection effect on the first assembly part 12 and the second assembly part 16 can be improved, the space of the cover plate body 21 can be fully utilized, the space utilization rate can be improved, and the assembly interference with the pole post 22 and the first connecting plate 23 can be avoided.

[0054] Understandably, the thickness T1 of the plug 2111 cannot be too small, as this will easily cause deformation during welding. The thickness T1 of the plug 2111 cannot be too large either, as this will reduce the space utilization of the cover plate assembly 2. The thickness T2 of the side 2112 cannot be too small, as this will reduce the protective effect on the side 2112 of the first assembly part 12 and the side 2112 of the second assembly part 16. The thickness T2 of the side 2112 cannot be too large either, as this will occupy the assembly space and will be detrimental to the assembly of the pole post 22 and the first connecting plate 23.

[0055] See Figure 3 and Figure 4 In some embodiments, the end of the housing 3 facing the cover plate body 21 is provided with a positioning protrusion 311, and the cover plate body 21 is provided with a corresponding groove 212, so that the housing 3 and the cover plate body 21 are engaged.

[0056] In this embodiment, the positioning protrusion 311 is a trapezoidal plate structure. The length of the positioning protrusion 311 on the side facing the cover plate body 21 is less than the length on the side away from the cover plate body 21. The positioning protrusion 311 is integrally formed with the side of the housing 3 in the second direction Y. The positioning protrusion 311 extends along the third direction Z. The shape of the groove 212 is adapted to the shape of the positioning protrusion 311.

[0057] Thus, the positioning protrusion 311 is provided on the side of the housing 3 in the second direction Y, which can avoid assembly interference with the second protrusion 14, make full use of the side space of the housing 3 in the second direction Y, improve space utilization, and the trapezoidal positioning protrusion 311 can facilitate the guide of the cover plate body 21 to engage with the housing 3, thereby improving positioning and assembly efficiency.

[0058] It is understandable that the position and shape of the positioning protrusion 311 can be adjusted according to actual needs, which will not be elaborated here.

[0059] See Figure 8 In some embodiments, along the first direction X, the depth of the groove 212 is E, and satisfies 4mm≤E≤10mm. The side of the groove 212 in the third direction Z is inclined, and the included angle between the two sides of the groove 212 in the third direction Z is N, and satisfies 10°≤N≤80°.

[0060] In this embodiment, the depth E of the groove 212 can be any value between 3mm and 10mm or any range between any two values, such as 3mm, 5mm, 7mm, 9mm, 10mm, etc. The included angle N of the two sides of the groove 212 in the third direction Z can be any value between 10° and 80° or any range between any two values, such as 10°, 20°, 40°, 60°, 80°, etc.

[0061] In this way, the positioning protrusion 311 and the groove 212 engage, which can improve the connection stability between the cover plate body 21 and the shell 3, improve the protection effect on the electrode group 1, the electrode post 22 and the first connecting plate 23, avoid damage and movement of the electrode group 1 during the process of entering the shell, and make the overall battery structure more compact, thereby improving the battery capacity and assembly ratio.

[0062] Understandably, the depth E of the groove 212 cannot be too small, as this would affect the engagement between the groove 212 and the positioning protrusion 311. Conversely, the depth E of the groove 212 cannot be too large, as this would reduce the structural strength of the cover plate body 21 and decrease the assembly effect. The included angle N of the two sides of the groove 212 in the third direction Z cannot be too small, as this would hinder the rapid positioning of the housing 3 and the cover plate body 21. Similarly, the included angle N of the two sides of the groove 212 in the third direction Z cannot be too large, as this would reduce the engagement between the groove 212 and the positioning protrusion 311.

[0063] To verify the rationality of the following parameters: the distance H1 between the surface of the snap-fit ​​part 211 away from the electrode group 1 and the surface of the first connecting plate 23 away from the electrode group 1; the total height H2 of the cover body 21; the depth E of the groove 212; the difference between the total width B2 of the cover body 21 and the width B1 of the cover body 21 corresponding to the electrode group 1; the difference between the width B1 of the cover body 21 corresponding to the electrode group 1 and the width W1 of the cover body 21 corresponding to the second assembly part 16; the ratio of the width W2 of the cover body 21 corresponding to the first assembly part 12 and the width B1 of the cover body 21 corresponding to the electrode group 1; the ratio of the width L1 of the cover body 21 corresponding to the second protrusion 14 and the total length A of the cover body 21; the included angle N of the two sides of the groove 212 in the third direction Z; the thickness T1 of the plug 2111; and the thickness T2 range of the side 2112, as shown in Table 1, this embodiment provides six sets of embodiments and six sets of comparative examples for illustration.

[0064] Table 1 As shown in Examples 1 to 6, after meeting the range limitations, the battery yield meets the requirements, and no abnormalities such as positioning deviations or strength differences in the cover plate and housing 3 are observed. The cover plate assembly 2, explosion-proof valve 4, electrode group 1, and electrode tab 11 are all undamaged and undeformed. The current-carrying capacity of the cover plate assembly 2 meets the battery requirements.

[0065] As can be seen from Comparative Example 1, when the difference between the total width B2 of the cover plate body 21 and the width B1 of the corresponding electrode group 1 position of the cover plate body 21 is too small, the battery yield does not meet the requirements. The height of the second protrusion 14 is insufficient, which reduces the size of the corresponding electrode group 1 and affects the increase in battery capacity.

[0066] As can be seen from Comparative Example 2, when the difference between the total width B2 of the cover plate body 21 and the width B1 of the corresponding electrode group 1 position of the cover plate body 21 is too large, the battery yield does not meet the requirements. The height of the second protrusion 14 is too large, which increases the difficulty and cost of stamping the cover plate body 21 and the shell 3 at the corresponding position.

[0067] As can be seen from Comparative Example 3, when the difference between the width B1 of the cover plate body 21 corresponding to the position of the electrode group 1 and the width W1 of the cover plate body 21 corresponding to the position of the second assembly part 16 is too small, the battery yield does not meet the requirements, the narrowest position dimension of the first connecting plate 23 is insufficient, the structural strength of the first connecting plate 23 is insufficient, it is difficult to ensure the assembly accuracy, and the heat effect generated during welding is large, which can easily lead to its deformation and reduce the safety performance of the cover plate body 21.

[0068] As can be seen from Comparative Example 4, when the difference between the width B1 of the cover plate body 21 corresponding to the position of the electrode group 1 and the width W1 of the cover plate body 21 corresponding to the position of the second assembly part 16 is too large, the battery yield does not meet the requirements. The narrowest position of the first connecting plate 23 is too large, the space of the first protrusion 13 and the second protrusion 14 is limited, the size of the electrode group 1 at the corresponding position is reduced, and the increase in battery capacity is affected.

[0069] As can be seen from Comparative Example 5, when the ratio of the width L1 of the cover body 21 corresponding to the position of the second protrusion 14 to the total length A of the cover body 21 is too small, the battery yield does not meet the requirements. The width of the second protrusion 14 is insufficient, which leads to a reduction in the size of the second protrusion 14, reducing the size of the corresponding electrode group 1, and affecting the increase in battery capacity.

[0070] As can be seen from Comparative Example 6, when the ratio of the width L1 of the cover body 21 corresponding to the position of the second protrusion 14 to the total length A of the cover body 21 is too large, the battery yield does not meet the requirements. The width of the second protrusion 14 is too large, occupying the assembly space on both sides, resulting in insufficient welding flow area of ​​the cover assembly 2, which cannot meet the fast charging requirements of the battery.

[0071] 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 in that, include: Two pole groups (1) are arranged along a first direction (X), the two pole groups (1) are electrically connected, two tabs (11) are connected to the end of the pole group (1), and a first assembly part (12) is also connected to the end of the pole group (1). The two tabs (11) are respectively spaced on both sides of the first assembly part (12) in a third direction (Z). The cover plate assembly (2) includes a cover plate body (21) and a pole post (22). The cover plate body (21) is provided with a snap-fit ​​part (211) at the position corresponding to the first assembly part (12) so that the cover plate body (21) is snap-fitted to the pole group (1). The pole post (22) is disposed on the cover plate body (21). The pole tab (11) is connected to at least one of the pole posts (22). Along the first direction (X), the snap-fit ​​part (211) is disposed opposite to the surface of the pole group (1) and protrudes from the pole post (22). The first assembly part (12) extends along the second direction (Y). The housing (3) is connected to the cover plate body (21) and encloses a space for accommodating the pole group (1); The first direction (X) is the thickness direction of the cover body (21), the second direction (Y) is the length direction of the cover body (21), and the third direction (Z) is the width direction of the cover body (21).

2. The battery according to claim 1, characterized in that, The cover plate assembly (2) further includes a first connecting plate (23) and a second connecting plate (24). The first connecting plate (23) is disposed on the side of the cover plate body (21) away from the pole group (1), and the second connecting plate (24) is disposed on the side of the cover plate body (21) facing the pole group (1). The pole post (22) is disposed through the first connecting plate (23), the cover plate body (21) and the second connecting plate (24) in sequence. The second connecting plate (24) is connected to the pole tab (11).

3. The battery according to claim 2, characterized in that, Along the first direction (X), the distance between the surface of the snap-fit ​​part (211) facing away from the pole group (1) and the surface of the first connecting plate (23) facing away from the pole group (1) is H1, and satisfies 6mm≤H1≤35mm; and / or, the total height of the cover plate body (21) is H2, and satisfies 25mm≤H2≤60mm.

4. The battery according to claim 1, characterized in that, The pole group (1) has a first protrusion (13) and a second protrusion (14) connected to its side in the third direction (Z), and a third protrusion (15) connected to its side in the second direction (Y). The first protrusion (13), the second protrusion (14) and the third protrusion (15) all extend along the first direction (X).

5. The battery according to claim 4, characterized in that, Along the third direction (Z), the width of the cover body (21) corresponding to the position of the pole group (1) is B1, the total width of the cover body (21) is B2, and satisfies 16mm≤B2-B1≤70mm; and / or, the end of the pole group (1) is connected to a second assembly part (16), the second assembly part (16) is connected to the side of the first assembly part (12) on the third direction (Z), and along the third direction (Z), the width of the cover body (21) corresponding to the position of the second assembly part (16) is W1, and satisfies 20mm≤B1-W1≤70mm.

6. The battery according to claim 4, characterized in that, Along the third direction (Z), the width of the cover body (21) corresponding to the position of the pole group (1) is B1, the width of the cover body (21) corresponding to the position of the first assembly part (12) is W2, and satisfies 0.3≤W2 / B1≤0.55; and / or, along the second direction (Y), the width of the cover body (21) corresponding to the position of the second protrusion (14) is L1, the total length of the cover body (21) is A, and satisfies 0.33≤L1 / A≤0.

7.

7. The battery according to claim 1, characterized in that, The snap-fit ​​portion (211) includes a plug (2111) and a side (2112). The side (2112) is disposed around the side of the first assembly portion (12). The plug (2111) is disposed on the side of the first assembly portion (12) away from the pole group (1) and is disposed together with the side (2112) to form a space for accommodating the first assembly portion (12).

8. The battery according to claim 7, characterized in that, The thickness of the plug (2111) is T1, and satisfies 1mm≤T1≤3.5mm; and / or the thickness of the side (2112) is T2, and satisfies 1.5mm≤T2≤2.5mm.

9. The battery according to claim 1, characterized in that, The housing (3) has a positioning protrusion (311) at the end facing the cover plate body (21), and the cover plate body (21) has a corresponding groove (212) so that the housing (3) and the cover plate body (21) are engaged.

10. The battery according to claim 9, characterized in that, Along the first direction (X), the depth of the groove (212) is E, and satisfies 4mm≤E≤10mm; and / or, the groove (212) is inclined on the side of the third direction (Z), and the included angle between the two sides of the groove (212) on the third direction (Z) is N, and satisfies 10°≤N≤80°.

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