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 on the sides of 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. The cover plate assembly includes a first cover plate body, a second cover plate body, and multiple terminal posts. The first cover plate body is positioned corresponding to the first mounting groove, and the second cover plate body is positioned corresponding to the second mounting groove. Along a first direction, the surface of the first cover plate body facing away from the electrode group protrudes from the terminal posts. Each electrode group has a protrusion, and 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 a second direction, the surface of the housing facing away from the electrode group protrudes from the terminal posts. The protrusion can increase the battery's capacity and improve the protection of the terminal posts, making the battery structure more compact.

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, most cover plates are flat structures, and the rivet blocks and terminals protrude from the cover plate after assembly. This makes the rivet blocks and terminals susceptible to bumps and damage during transportation and assembly processes, resulting in poor protection for the rivet blocks and terminals. Furthermore, the battery occupies a lot of external space, affecting the battery packing rate and assembly ratio. The connection strength between the cover plate and the electrode pack is also poor, which can easily cause damage and movement of the electrode sheets during the process of pushing the electrode pack into the casing. The space utilization rate between the cover plate and the electrode pack is also low, which is not conducive to improving battery capacity. The structural strength of the casing and cover plate is also weak, and they are prone to deformation under external forces, affecting battery safety. Summary of the Invention

[0005] The purpose of this invention is to provide a battery that solves the problems of poor casing structure strength 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, wherein 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 on the side of 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, the first tab being disposed in the first mounting groove and the second tab being disposed in the second mounting groove; and 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, wherein the terminal posts disposed in the first mounting groove are... The electrode post disposed in the second assembly groove is electrically connected to the first electrode tab and 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 provided with a protrusion and 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 second direction, the surface of the housing opposite to the electrode group protrudes from the electrode post. The first direction is the thickness direction of the first cover plate body and the second direction is the length direction of the first cover plate body.

[0007] Preferably, the first assembly groove is formed at the corner of the electrode group. The first assembly 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 at the side of the electrode group. The shape of the first electrode lug is adapted to the shape of the first assembly groove.

[0008] Preferably, the protrusion is disposed on the surface of the electrode assembly in the third direction, and the first cover plate body includes a snap-fit ​​portion that snaps into the protrusion; the third direction is the width direction of the first cover plate body.

[0009] Preferably, the housing and the pole group are arranged in a one-to-one correspondence, and one of the ends of the two housings that are close to each other is provided with a step so that the two housings can be inserted into each other.

[0010] Preferably, along the second direction, the depth of the housing corresponding to the position of the second mounting groove is H2, and satisfies 10mm≤H2≤35mm; and / or, along the first direction, the height of the step is F, and satisfies 3mm≤F≤10mm.

[0011] Preferably, the battery further includes an explosion-proof valve, which is disposed on the second cover plate body.

[0012] Preferably, along the second direction, the width of the housing is A, the width of the housing where the first assembly groove is opened is L2, and the conditions satisfy 10mm≤A-L2≤50mm; and / or, along the first direction, the distance between the position of the housing corresponding to the bottom wall of the first assembly groove and the end face of the housing is H1, and the conditions satisfy 15mm≤H1≤70mm.

[0013] Preferably, along the first direction, the length of the housing is E, the length of the housing corresponding to the second mounting groove position is W1, and satisfies 0.15≤W1 / E≤0.33; and / or, the length of the housing corresponding to the protrusion position is W2, and satisfies 0.7≤W2 / E≤0.9.

[0014] Preferably, along the second direction, the width of the housing corresponding to the protrusion is L1, the width of the housing is A, and satisfies 0.33≤L1 / A≤0.75; and / or, along the third direction, the height of the housing is B1, the height of the housing corresponding to the protrusion is B2, and satisfies 16mm≤B2-B1≤70mm, where the third direction is the width direction of the first cover plate body.

[0015] Preferably, the wall thickness of the housing is T1, and satisfies 0.3mm≤T1≤0.8mm; and / or, along the second direction, the thickness of the second cover plate body is T2, and satisfies 1mm≤T2≤2mm.

[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 on the sides of 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 within the second mounting groove. 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 in the first mounting groove are electrically connected to the first tab, and the terminal posts disposed in the second mounting groove are electrically connected to the second tab. Along the first direction, the surface of the first cover plate body facing away from the electrode group protrudes beyond the terminal posts. Each electrode group has a protrusion, and 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 a second direction, the surface of the housing facing away from the electrode group protrudes beyond the terminal posts. The first direction is the thickness direction of the first cover plate body, and the second direction is the length direction of the first cover plate body.

[0017] In this way, the protrusion can increase the battery's capacity and improve the structural strength of the first cover plate body, the second cover plate body, and the shell, thereby improving the connection stability between the electrode assembly and the cover plate assembly and the shell. Placing the electrode post in the first and second assembly slots can improve the protection of the electrode post, avoid bumps and damage during transportation, assembly, and other processes, improve the safety of the battery, and make full use of the space at the end and side of the electrode assembly, making the battery structure more compact and facilitating the connection of the battery with external circuits or other batteries. 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 cross-sectional view of a battery in one embodiment of the present invention; Figure 3 This is a schematic diagram of the pole group structure in one embodiment of the present invention; Figure 4 This is a schematic diagram of the cover plate assembly in one embodiment of the present invention; Figure 5 This is an exploded view of a cover plate assembly according to an embodiment of the present invention; Figure 6 This is an exploded view of the housing and the second cover plate body in one embodiment of the present invention; Figure 7 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 8 This is a schematic diagram of the shell structure in one embodiment of the present invention; Figure 9 This is a cross-sectional view of the housing and the second cover plate body in one embodiment of the present invention; Figure 10 This is a top view of the housing in one embodiment of the present invention; Figure 11 This is a front view of the housing in one embodiment of the present invention; Figure 12 This is a cross-sectional view of the housing in one embodiment of the present invention.

[0019] In the picture: 1. Pole 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; 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. Pole 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 3This 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 on the side of 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. 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 being disposed corresponding to the first mounting groove 11 and the second cover plate body 22 being disposed corresponding to the second mounting 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 pole group 1 is provided with a protrusion 15. The pole 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 pole group 1. Along the second direction Y, the surface of the housing 3 facing away from the pole group 1 protrudes from the pole post 23. The first direction X is the thickness direction of the first cover plate body 21, and the second direction Y is the length direction of the first cover plate body 21.

[0025] In this embodiment, conductive coatings are provided at the ends 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 mounting grooves 11 of the two electrode groups 1 are located on the same side, and the second mounting grooves 12 of the two electrode groups 1 are located on the same side. When the two electrode groups 1 are assembled, the two second mounting grooves 12 are connected and form a space for accommodating the second cover plate body 22. The first cover plate body 21 is located at the end of the electrode group 1, and the second cover plate body 22 is located on the side of the electrode group 1. The pole post 2 is located on the second cover plate body 22. 3 is electrically connected to the second electrode ears 14 of both electrode groups 1. The protrusion 15 is integrally formed with the electrode group 1. The positions of the first cover plate body 21 and the housing 3 corresponding to the protrusion 15 are fitted to the protrusion 15 so that the first cover plate body 21 and the housing 3 are snapped into the electrode group 1. The first cover plate body 21 and the second cover plate body 22 are sealed and fixedly connected to the housing 3 by welding. The accommodating space formed by the first cover plate body 21, the second cover plate body 22 and the housing 3 is adapted to the shape of the electrode group 1.

[0026] Thus, the protrusion 15 not only increases the battery's capacity but also enhances the structural strength of the housing 3 and the first cover plate body 21, and improves the connection stability between the electrode assembly 1 and the housing 3 and the first cover plate body 21. This reduces damage and movement of the electrode assembly 1 during assembly. By placing the electrode post 23 in the first assembly groove 11 and the second assembly groove 12, the protection effect on the electrode post 23 is improved, preventing the electrode post 23 from being bumped or damaged during transportation, assembly, and other processes, thereby improving the safety of the battery.

[0027] It is understandable that the first assembly slots 11 of the two pole groups 1 can also be set on different sides. The setting position of the first assembly slots 11 can be adjusted according to actual needs, which will not be listed in detail here.

[0028] Further, see Figures 3 to 6 In some embodiments, the cover plate assembly 2 further 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 and connected to the corresponding first electrode tab 13 or the second electrode tab 14. The first plastic 26 is disposed between the first welding block 24 and the 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 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 in the first assembly groove 11. The surface of the housing 3 away from the electrode group 1 protrudes from the second welding block 25 in the second assembly groove 12.

[0029] This improves the space utilization at the end of the electrode assembly 1, making the battery structure more compact, and enhances the protection of the first welding block 24, preventing bumps and damage during transportation, assembly and other processes, thus improving battery safety.

[0030] See Figure 3 In some embodiments, 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 at the side of the pole group 1. The shape of the first electrode ear 13 is adapted to the shape of the first mounting groove 11.

[0031] In this embodiment, the first assembly groove 11 is an L-shaped groove, and correspondingly, the first electrode tab 13 is also an L-shaped structure. The first part 111 extends along the second direction Y, and the second part 112 extends along the first direction X. The first cover plate body 21 includes a bending part 212 and a connecting part 213. The bending part 212 is positioned corresponding to the first assembly groove 11, and the connecting part 213 is located on the side of the bending part 212 facing the electrode group 1, so that the first cover plate body 21 can fit against the end face of the electrode group 1. The second assembly groove 12 is a straight groove extending along the first direction X.

[0032] Thus, by setting the pole posts 23 at the end and side of the pole group 1 respectively, the overcurrent capacity of the battery can be improved, which is beneficial for connecting multiple batteries and connecting the battery to the external circuit. It also reduces the difficulty of fitting the shell and cover, improves the space utilization and structural strength of the shell 3 and the cover assembly 2, makes the battery structure more compact, avoids deformation of the shell 3 and the cover assembly 2 during the welding process, and improves the safety of the battery.

[0033] It is understandable that the number and position of the first assembly slot 11 and the second assembly slot 12 can be adjusted according to actual needs, as long as the protection effect on the pole post 23 and the first welding block 24 is improved and the end and side space of the pole group 1 is fully utilized, which will not be elaborated here.

[0034] See Figure 3 and Figure 4 In some embodiments, the protrusion 15 is disposed on the surface of the pole group 1 in the third direction Z, and the first cover plate body 21 includes a snap-fit ​​part 211, which is snap-fitted to the protrusion 15; the third direction Z is the width direction of the first cover plate body 21.

[0035] In this embodiment, the protrusions 15 are symmetrically arranged on two surfaces of the electrode assembly 1 in the third direction Z. One end of the protrusions 15 facing the second mounting groove 12 is spaced apart from the end of the electrode assembly 1. The protrusions 15 extend along the first direction X. The first cover plate body 21 is fitted to the end of the electrode assembly 1.

[0036] In this way, the position of the housing 3 facing the end of the electrode group 1 can be set flat, which is convenient for the molding and processing of the housing 3. It is also beneficial for the housing 3 and the first cover plate body 21 to be stably welded together, which improves the structural strength of the housing 3 and the first cover plate body 21, avoids deformation under external force, and makes full use of the space of the electrode group 1 in the third direction Z to increase the battery capacity and improve the battery assembly ratio.

[0037] It is understandable that the protrusion 15 may also be provided only on one side of the pole group 1. The number and location of the protrusion 15 can be adjusted according to actual needs, which will not be elaborated here.

[0038] See Figure 3 and Figure 6 In some embodiments, the housing 3 and the pole group 1 are arranged in a one-to-one correspondence, and 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.

[0039] In this embodiment, see Figure 7 and Figure 8 The step 31 is provided around the end of one of the housings 3 facing the other housing 3. When the two housings 3 are joined and welded together, the step 31 is located outside the other housing 3.

[0040] Thus, step 31 can guide the assembly of the two housings 3, improve assembly efficiency and assembly accuracy of housing 3, reduce the risk of deformation of housing 3 when subjected to external force, and can be stably connected with the second cover plate body 22, improve the connection strength between the second cover plate body 22 and the pole group 1, and avoid damage and movement of pole group 1 when it enters the housing.

[0041] See Figure 9 and Figure 10 In some embodiments, along the second direction Y, the housing 3 corresponds to the second mounting groove 12 (see...). Figure 3 The depth of the position is H2, and it satisfies 10mm≤H2≤35mm. Along the first direction X, the height of step 31 is F, and it satisfies 3mm≤F≤10mm.

[0042] In this embodiment, the depth H2 of the housing 3 corresponding to the position of the second assembly groove 12 can be any value between 10mm and 35mm or any range between any two values, such as 10mm, 15mm, 20mm, 25mm, 30mm, etc.; the height F of the step 31 can be any value between 3mm and 10mm or any range between any two values, such as 3mm, 6mm, 9mm, 10mm, etc.

[0043] In this way, the second assembly groove 12 can have sufficient height to accommodate the second cover plate body 22, the electrode post 23 and the first welding block 24, thereby improving the protection effect on the electrode post 23 and the first welding block 24 and avoiding bumps and damage during transportation, assembly and other processes. By limiting the height of the step 31, the step 31 can guide the assembly of the housing 3 without occupying too much space inside the housing 3, which is conducive to improving the battery's capacity and assembly ratio, and making the battery structure more compact.

[0044] Understandably, the depth H2 of the housing 3 corresponding to the second assembly groove 12 position cannot be too small, as this would reduce the assembly space of the cover plate assembly 2 and affect the protection effect on the pole post 23 and the first welding block 24. The depth H2 of the housing 3 corresponding to the second assembly groove 12 position cannot be too large either, as this would reduce the volume of the pole group 1 and be detrimental to the increase in power. The height F of the step 31 cannot be too small, as this would be detrimental to the assembly and positioning of the two housings 3. The height F of the step 31 cannot be too large either, as this would occupy too much internal space of the housing 3.

[0045] See Figure 7 In some embodiments, the battery also includes an explosion-proof valve 4, which is disposed on the second cover body 22.

[0046] In this embodiment, two explosion-proof valves 4 are provided, and the two explosion-proof valves 4 are respectively provided on both sides of the first welding block 24 located in the second assembly groove 12 in the first direction X.

[0047] Thus, by placing the explosion-proof valve 4 on the second cover body 22, the space of the side of the electrode group 1 and the second cover body 22 can be fully utilized, improving the space utilization rate. When the battery experiences thermal runaway, the gas can be quickly discharged to the outside through the explosion-proof valve 4, improving the safety of the battery.

[0048] It is understandable that the explosion-proof valve 4 can also be installed on the first cover plate body 21. The number and installation position of the explosion-proof valve 4 can be adjusted according to actual needs, and will not be listed in detail here.

[0049] See Figure 3 and Figure 11 In some embodiments, along the second direction Y, the width of the housing 3 is A, the width of the housing 3 where the first assembly groove 11 is opened is L2, and the conditions are satisfied that 10mm≤A-L2≤50mm. Along the first direction X, the distance between the position of the housing 3 corresponding to the bottom wall of the first assembly groove 11 and the end face of the housing 3 is H1, and the conditions are satisfied that 15mm≤H1≤70mm.

[0050] In this embodiment, the difference between the width A of the housing 3 and the width L2 of the housing 3 where the first assembly groove 11 is opened (that is, the height of the first assembly groove 11) can be any value between 10mm and 50mm or any two values, such as 10mm, 20mm, 30mm, 40mm, 50mm, etc.; the distance H1 between the position of the bottom wall of the housing 3 corresponding to the first assembly groove 11 and the end face of the housing 3 can be any value between 15mm and 70mm or any two values, such as 15mm, 20mm, 40mm, 60mm, 70mm, etc.

[0051] In this way, the electrode assembly 1 can be stably engaged with the housing 3, improving the connection strength between the electrode assembly 1 and the housing 3, preventing damage and movement of the electrode assembly 1 when it is inserted into the housing, improving the assembly effect, and improving the connection strength between the position of the housing 3 corresponding to the first assembly groove 11 and the position of the first cover plate body 21 corresponding to the first assembly groove 11, preventing deformation of the connection due to external force.

[0052] Understandably, the difference between the width A of the housing 3 and the width L2 at the location where the first assembly slot 11 is opened on the housing 3 cannot be too small. If it is too small, the height of the first assembly slot 11 will be insufficient, reducing the assembly space of the cover plate assembly 2. The difference between the width A of the housing 3 and the width L2 at the location where the first assembly slot 11 is opened on the housing 3 cannot be too large. If it is too large, the size of the electrode group 1 will be reduced, reducing the space utilization rate. The distance H1 between the position of the bottom wall of the housing 3 corresponding to the first assembly slot 11 and the end face of the housing 3 cannot be too small. If it is too small, the length of the first electrode tab 13 will be shortened, affecting the battery's current carrying capacity. The distance H1 between the position of the bottom wall of the housing 3 corresponding to the first assembly slot 11 and the end face of the housing 3 cannot be too large. If it is too large, it will be detrimental to the improvement of the power capacity.

[0053] See Figure 3 and Figure 9 In some embodiments, along the first direction X, the length of the housing 3 is E, the length of the housing 3 corresponding to the position of the second mounting groove 12 is W1, and satisfies 0.15≤W1 / E≤0.33, and the length of the housing 3 corresponding to the position of the protrusion 15 is W2, and satisfies 0.7≤W2 / E≤0.9.

[0054] In this embodiment, the ratio of the length W1 of the housing 3 corresponding to the position of the second mounting groove 12 to the length E of the housing 3 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 ratio of the length W2 of the housing 3 corresponding to the position of the protrusion 15 to the length E of the housing 3 can be any value between 0.7 and 0.9 or any range between any two values, such as 0.7, 0.75, 0.8, 0.85, 0.9, etc.

[0055] Thus, the first mounting groove 11 has sufficient length to accommodate the second tab 14 and the corresponding cover plate assembly 2, improving the battery's overcurrent capacity and making full use of the space on the side of the electrode group 1, making the battery structure more compact. The protrusion 15 improves the overall battery capacity while enhancing the connection stability between the electrode group 1 and the housing 3, limiting the relative position of the electrode group 1 and the housing 3, enabling the electrode group 1 to be stably connected to the cover plate assembly 2, and improving the battery's safety.

[0056] Understandably, the ratio of the length W1 of the housing 3 corresponding to the second mounting groove 12 to the length E of the housing 3 cannot be too small. If it is too small, it will shorten the length of the second tab 14, affecting the current carrying capacity of the battery. The ratio of the length W1 of the housing 3 corresponding to the second mounting groove 12 to the length E of the housing 3 cannot be too large either. If it is too large, it will occupy too much space on the side of the electrode group 1, affecting the space utilization rate. The ratio of the length W2 of the housing 3 corresponding to the protrusion 15 to the length E of the housing 3 cannot be too small. If it is too small, it will affect the increase in power capacity. The ratio of the length W2 of the housing 3 corresponding to the protrusion 15 to the length E of the housing 3 cannot be too large either. If it is too large, it will increase the processing difficulty of the housing 3 and the welding yield of the housing cover.

[0057] See Figure 11 and Figure 12 In some embodiments, along the second direction Y, the width of the housing 3 corresponding to the protrusion 15 is L1, the width of the housing 3 is A, and 0.33≤L1 / A≤0.75 is satisfied. Along the third direction Z, the height of the housing 3 is B1, the height of the housing 3 corresponding to the protrusion 15 is B2, and 16mm≤B2-B1≤70mm is satisfied.

[0058] In this embodiment, the ratio of the width L1 of the housing 3 corresponding to the protrusion 15 to the width A of the housing 3 can be any value between 0.33 and 0.75 or any two values, such as 0.33, 0.5, 0.7, 0.75, etc.; the difference between the height B2 of the housing 3 corresponding to the protrusion 15 and the height B1 of the housing 3 (that is, the sum of the heights of the protrusion 15) can be any value between 16mm and 70mm or any two values, such as 16mm, 20mm, 40mm, 60mm, 70mm, etc.

[0059] In this way, the space of the electrode assembly 1 in the third direction Z can be fully utilized, and the protrusion 15 can be engaged with the housing 3, which improves the connection strength between the housing 3 and the electrode assembly 1 and increases the battery capacity. At the same time, there will be no assembly interference with the cover plate assembly 2, which is conducive to the connection of the battery with other batteries or external circuits, and improves the battery assembly ratio and assembly rate.

[0060] Understandably, the ratio of the width L1 of the protrusion 15 on the housing 3 to the width A of the housing 3 cannot be too small, as this would affect the increase in power capacity. Similarly, the ratio of the width L1 of the protrusion 15 on the housing 3 to the width A of the housing 3 cannot be too large, as this would increase the difficulty of molding the housing 3 and the electrode assembly 1, and make it easier for them to interfere with the assembly of the cover plate assembly 2. The difference between the height B2 of the protrusion 15 on the housing 3 and the height B1 of the housing 3 cannot be too small, as this would reduce the size of the protrusion 15. The difference between the height B2 of the protrusion 15 on the housing 3 and the height B1 of the housing 3 cannot be too large, as this would increase the overall size of the battery and affect the space utilization rate.

[0061] See Figure 9 and Figure 12 In some embodiments, the wall thickness of the housing 3 is T1, and satisfies 0.3mm≤T1≤0.8mm. Along the second direction Y, the thickness of the second cover plate body 22 is T2, and satisfies 1mm≤T2≤2mm.

[0062] In this embodiment, the wall thickness T1 of the shell 3 can be any value between 0.3mm and 0.8mm or any range between any two values, such as 0.3mm, 0.4mm, 0.6mm, 0.8mm, etc.; the thickness T2 of the second cover plate body 22 can be any value between 1mm and 2mm or any range between any two values, such as 1mm, 1.2mm, 1.4mm, 1.6mm, 1.8mm, 2mm, etc.

[0063] In this way, the housing 3 and the cover plate assembly 2 can have sufficient structural strength, avoid deformation during welding and assembly, improve the connection stability between the housing 3 and the cover plate assembly 2 and the electrode group 1, thereby improving the safety of the battery, and improving the protection effect on the electrode post 23 and the first welding block 24, preventing the electrode post 23 and the first welding block 24 from being bumped and damaged during transportation, assembly and other processes.

[0064] Understandably, the wall thickness T1 of the casing 3 cannot be too small, as this would result in insufficient structural strength of the casing 3. The wall thickness T1 of the casing 3 also cannot be too large, as this would increase the overall size of the battery. The thickness T2 of the second cover plate body 22 cannot be too small, as this would affect the structural strength of the second cover plate body 22 and reduce the welding yield between the casing 3 and the second cover plate body 22. The thickness T2 of the second cover plate body 22 also cannot be too large, as this would result in occupying too much space on the side of the electrode assembly 1 and reducing space utilization.

[0065] To demonstrate the rationality of the ranges of the following parameters: the difference between the width A of the housing 3 and the width L2 at the location where the first assembly groove 11 is opened in the housing 3; the height F of the step 31; the ratio of the width L1 of the housing 3 corresponding to the position of the protrusion 15 to the width A of the housing 3; the difference between the height B2 of the housing 3 corresponding to the position of the protrusion 15 and the height B1 of the housing 3; the distance H1 between the position of the bottom wall of the housing 3 corresponding to the first assembly groove 11 and the end face of the housing 3; the depth H2 of the housing 3 corresponding to the position of the second assembly groove 12; the ratio of the length W1 of the housing 3 corresponding to the position of the second assembly groove 12 to the length E of the housing 3; the ratio of the length W2 of the housing 3 corresponding to the position of the protrusion 15 to the length E of the housing 3; the wall thickness T1 of the housing 3; and the thickness T2 of the second cover plate body 22, as shown in Table 1, this embodiment provides six sets of embodiments and six sets of comparative examples for illustration.

[0066] Table 1 As can be seen from Examples 1 to 6 in Table 1, after the range limitation is met, the battery yield meets the requirements, and there are no abnormalities such as assembly positioning deviation of shell 3 and cover plate assembly 2, or low structural strength. There is no damage or deformation of shell 3, electrode group 1, etc., and the battery temperature and exhaust time meet the battery requirements.

[0067] As can be seen from Comparative Example 1, when the height F of step 31 is too small, the battery yield does not meet the requirements. The width of step 31 of housing 3 is insufficient, making it difficult to position housing 3 during assembly. At the same time, the dimensional accuracy is low during laser welding.

[0068] As can be seen from Comparative Example 2, when the height F of step 31 is too large, the battery yield does not meet the requirements. The width of step 31 of housing 3 is too large, which increases the difficulty of housing 3 manufacturing process, reduces the efficiency of housing 3 assembly, and increases the weight and cost of housing 3.

[0069] As can be seen from Comparative Example 3, when the ratio of the width L1 of the corresponding protrusion 15 position of the housing 3 to the width A of the housing 3 is too small, the battery yield does not meet the requirements, the size of the protrusion 15 is insufficient, and the increase in battery capacity is reduced.

[0070] As shown in Comparative Example 4, when the ratio of the width L1 of the housing 3 corresponding to the protrusion 15 to the width A of the housing 3 is too large, the battery yield does not meet the requirements, and the size of the protrusion 15 is too large. This increases the difficulty of part forming, affects the weldable area of ​​the first welding block 24 at the end of the electrode assembly 1, and affects the battery overcurrent.

[0071] As can be seen from Comparative Example 5, when the ratio of the length W2 of the corresponding protrusion 15 position of the housing 3 to the length E of the housing 3 is too small, the battery yield does not meet the requirements, the size of the protrusion 15 is insufficient, and the increase in battery capacity is reduced.

[0072] As can be seen from Comparative Example 6, when the ratio of the length W2 of the corresponding protrusion 15 position of the housing 3 to the length E of the housing 3 is too large, the battery yield does not meet the requirements. The protrusion 15 is too large, which increases the processing difficulty of the housing 3, reduces the forming accuracy of the housing 3 at the cover assembly 2, and reduces the welding yield of the cover.

[0073] 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 ends of the two pole groups (1) that are far apart from each other are provided with a first mounting groove (11), and the sides of 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 disposed in the first mounting groove (11), and the second electrode tab (14) is disposed in the second mounting groove (12). 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) has a protrusion (15) on the electrode assembly (1). The electrode assembly (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 assembly (1). Along the second direction (Y), the surface of the housing (3) facing away from the electrode assembly (1) protrudes from the pole post (23). The first direction (X) is the thickness direction of the first cover plate body (21), and the second direction (Y) is the length direction of the first cover plate body (21).

2. The battery according to claim 1, characterized in that, The first assembly groove (11) is formed at the corner of the pole group (1). The first assembly 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 at the side of the pole group (1). The shape of the first electrode ear (13) is adapted to the shape of the first assembly groove (11).

3. The battery according to claim 1, characterized in that, The protrusion (15) is disposed on the surface of the pole group (1) in the third direction (Z), and the first cover plate body (21) includes a snap-fit ​​part (211), which is snap-fitted to the protrusion (15). The third direction (Z) is the width direction of the first cover plate body (21).

4. The battery according to claim 1, characterized in that, The housing (3) is provided in a one-to-one correspondence with the pole 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.

5. The battery according to claim 4, characterized in that, Along the second direction (Y), the depth of the housing (3) corresponding to the position of the second assembly groove (12) is H2, and satisfies 10mm≤H2≤35mm; and / or, along the first direction (X), the height of the step (31) is F, and satisfies 3mm≤F≤10mm.

6. The battery according to claim 1, characterized in that, The battery also includes an explosion-proof valve (4), which is disposed on the second cover plate body (22).

7. The battery according to any one of claims 1-6, characterized in that, Along the second direction (Y), the width of the housing (3) is A, the width of the housing (3) where the first assembly groove (11) is opened is L2, and 10mm≤A-L2≤50mm is satisfied; and / or, along the first direction (X), the distance between the position of the housing (3) corresponding to the bottom wall of the first assembly groove (11) and the end face of the housing (3) is H1, and 15mm≤H1≤70mm is satisfied.

8. The battery according to any one of claims 1-6, characterized in that, Along the first direction (X), the length of the housing (3) is E, the length of the housing (3) corresponding to the position of the second mounting groove (12) is W1, and satisfies 0.15≤W1 / E≤0.33; and / or, the length of the housing (3) corresponding to the position of the protrusion (15) is W2, and satisfies 0.7≤W2 / E≤0.

9.

9. The battery according to any one of claims 1-6, characterized in that, Along the second direction (Y), the width of the housing (3) corresponding to the position of the protrusion (15) is L1, the width of the housing (3) is A, and satisfies 0.33≤L1 / A≤0.75; and / or, along the third direction (Z), the height of the housing (3) is B1, the height of the housing (3) corresponding to the position of the protrusion (15) is B2, and satisfies 16mm≤B2-B1≤70mm, where the third direction (Z) is the width direction of the first cover plate body (21).

10. The battery according to any one of claims 1-6, characterized in that, The wall thickness of the housing (3) is T1, and satisfies 0.3mm≤T1≤0.8mm; and / or, along the second direction (Y), the thickness of the second cover body (22) is T2, and satisfies 1mm≤T2≤2mm.

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