A battery

Abstract

The application belongs to the technical field of batteries, and discloses a battery, which comprises a pole group, a cover plate assembly and a shell, the pole group comprises a first pole group and two second pole groups, the two second pole groups are symmetrically arranged on the two sides of the first pole group in a first direction, the length direction of the second pole group is arranged at an angle with the first direction, the end face of the second pole group away from the first pole group is provided with a tab and an assembly groove, and the tab is arranged in the assembly groove; the cover plate assembly comprises a cover plate body and a pole column, the cover plate body is arranged on the end face of the second pole group away from the first pole group, and the pole column is electrically connected with the tab; the shell and the cover plate body enclose a space for accommodating the first pole group and the second pole group, the shell is shaped according to the shape of the pole group, and the first direction is the length direction of the first pole group. In this way, the capacity and the space utilization of the battery can be improved, and the protection effect on the pole column can be improved.

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 also 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, and the terminal post is connected to the tab.

[0004] However, most current cover plates are flat structures, with the rivet blocks and terminals protruding from the cover plate. This not only occupies a lot of external space and affects the assembly rate, but also provides poor protection for the rivet blocks and terminals. They are prone to bumps and damage during transportation and assembly processes, affecting the yield and safety performance of the batteries. Batteries assembled in automobile chassis are limited by structural space, making it difficult to increase battery capacity, resulting in low space utilization. Furthermore, the casing structure has poor strength and is easily deformed by external forces during assembly and use. Summary of the Invention

[0005] The purpose of this invention is to provide a battery that solves the problems of poor protection of the rivet blocks and terminals, low structural strength, and low space utilization.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A battery includes: an electrode assembly comprising a first electrode assembly and two second electrode assemblies, the two second electrode assemblies being symmetrically arranged on both sides of the first electrode assembly in a first direction, the length direction of the second electrode assembly being obliquely intersecting the first direction, and the end face of the second electrode assembly opposite to the first electrode assembly having a tab and a mounting groove, the tab being disposed within the mounting groove; a cover plate assembly comprising a cover plate body and a terminal post, the cover plate body being disposed on the end face of the second electrode assembly opposite to the first electrode assembly, the terminal post being electrically connected to the tab; and a housing, the housing and the cover plate body enclosing a space for accommodating the first electrode assembly and the second electrode assemblies, the housing conforming to the shape of the electrode assembly; the first direction being the length direction of the first electrode assembly.

[0008] Preferably, the end face of the second electrode group opposite to the first electrode group is provided with two first assembly parts and one second assembly part. The two first assembly parts are respectively provided on both sides of the assembly groove in its length direction, and the second assembly part is provided in the assembly groove. The end face of the second electrode group is provided with two electrode tabs, and the two electrode tabs are respectively provided on both sides of the second assembly part in a second direction. The second direction is the thickness direction of the first electrode group, and the first direction is perpendicular to the second direction.

[0009] Preferably, the housing includes a connecting surface, which includes a first surface, a second surface, and a third surface. The two ends of the second surface are connected to the first surface and the third surface, respectively. The first surface is disposed corresponding to the end face of the first assembly part in the length direction of the second pole group. The second surface and the third surface are disposed corresponding to the bottom wall of the assembly groove. Along the length direction of the second pole group, the distance between the first surface and the third surface is H, and satisfies 12mm≤H≤60mm; and / or, the first surface and the first assembly part are disposed in a one-to-one correspondence. Along the width direction of the second pole group, the distance between the two first surfaces is L1. The housing includes a first part and a second part. The first pole group is disposed in the first part, and the second pole group is disposed in the second part. The width of the second part is A, and satisfies 0.5≤L1 / A≤0.75.

[0010] Preferably, the first assembly part includes an inclined surface, which is disposed on the side of the first assembly part facing the pole post. Two first assembly parts are symmetrically arranged, and a second surface is disposed corresponding to the inclined surface. The included angle between the two second surfaces is N1, and satisfies 60°≤N1≤120°; and / or, the included angle in the length direction of the two second pole groups is N2, and satisfies 100°≤N2≤140°.

[0011] Preferably, the housing has an opening, which includes a first opening and a second opening disposed opposite to each other on both sides of the first electrode group in a third direction. The housing is connected to a first mounting plate and a second mounting plate. The first mounting plate is disposed in the first opening, and the second mounting plate is disposed in the second opening. Both the first mounting plate and the second mounting plate are connected to the housing. The third direction is the width direction of the first electrode group, and the first direction is perpendicular to the third direction.

[0012] Preferably, the length of the first mounting plate is greater than the length of the second mounting plate, and the first mounting plate is provided with a limiting step that engages with the housing.

[0013] Preferably, along the first direction, the length of the first mounting plate is W1, the length of the housing on the projection plane perpendicular to the third direction is E, and satisfies 0.25≤W1 / E≤0.45; and / or, the width of the housing on the projection plane perpendicular to the third direction is B, and satisfies 20mm≤B≤120mm.

[0014] Preferably, along the first direction, the length of the first mounting plate is W1, the length of the second mounting plate is W2, and the condition 5mm≤W1-W2≤30mm is met; and / or, the housing includes a first part and a second part, the first electrode group is disposed in the first part, the second electrode group is disposed in the second part, and along the length direction of the second electrode group, the length of the second part is L2, and the condition 1≤L2 / W1≤2 is met.

[0015] Preferably, the housing includes a first part and a second part, the first electrode group is disposed in the first part, the second electrode group is disposed in the second part, the bending radius at the connection between the second mounting plate and the second part is R, and satisfies 10mm≤R≤60mm; and / or, the wall thickness of the first mounting plate is T1, the wall thickness of the housing is T2, and satisfies 0.35mm≤T1-T2≤1mm.

[0016] Preferably, the battery further includes an explosion-proof valve, which is disposed on the first mounting plate and / or the second mounting plate.

[0017] The beneficial effects of this invention are:

[0018] A battery includes an electrode assembly, a cover plate assembly, and a housing. The electrode assembly includes a first electrode assembly and two second electrode assemblies, which are symmetrically arranged on both sides of the first electrode assembly in a first direction. The length direction of the second electrode assembly is obliquely intersecting the first direction. The end face of the second electrode assembly opposite to the first electrode assembly is provided with a tab and a mounting groove, and the tab is disposed in the mounting groove. The cover plate assembly includes a cover plate body and a terminal post. The cover plate body is disposed on the end face of the second electrode assembly opposite to the first electrode assembly, and the terminal post is electrically connected to the tab. The housing and the cover plate body enclose a space for accommodating the first electrode assembly and the second electrode assembly, and the housing conforms to the shape of the electrode assembly. The first direction is the length direction of the first electrode assembly.

[0019] Thus, the tabs are positioned within the assembly slot, which improves the protection of the tabs and terminals, preventing bumps and damage during transportation and assembly processes. It also enhances the connection stability between the second electrode group and the cover plate, thereby improving the structural strength of the battery, preventing deformation caused by external forces, increasing the space utilization rate at the end of the second electrode group, saving assembly space, and facilitating the series and parallel connection of multiple batteries. The oblique arrangement of the first and second electrode groups fully utilizes the assembly space of the vehicle chassis, improving the assembly rate and the battery's current carrying capacity. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the battery structure in one embodiment of the present invention;

[0021] Figure 2 This is a cross-sectional view of a battery in one embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the pole group structure in one embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the cover plate assembly in one embodiment of the present invention;

[0024] Figure 5 This is an exploded view of a cover plate assembly according to an embodiment of the present invention;

[0025] Figure 6 This is a schematic diagram of the shell structure in one embodiment of the present invention;

[0026] Figure 7 This is an exploded view of the housing in one embodiment of the present invention;

[0027] Figure 8 This is one embodiment of the present invention. Figure 7 Enlarged view of point A;

[0028] Figure 9 This is a front view of the housing in one embodiment of the present invention;

[0029] Figure 10 This is a top view of the housing in one embodiment of the present invention.

[0030] In the picture:

[0031] 1. First pole group; 2. Second pole group; 21. First assembly part; 211. Inclined surface; 22. Pole lug; 23. Assembly groove; 24. Second assembly part; 3. Cover plate assembly; 31. Cover plate body; 311. Snap-fit ​​part; 32. Pole post; 33. First connecting plate; 34. Second connecting plate; 35. First plastic; 36. Second plastic; 4. Housing; 41. Connecting surface; 411. First surface; 412. Second surface; 413. Third surface; 42. Opening; 421. First opening; 422. Second opening; 43. First mounting plate; 431. Limiting step; 44. Second mounting plate; 5. Explosion-proof valve; X, First direction; Y, Second direction; Z, Third direction. Detailed Implementation

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] See Figures 1 to 8This invention provides a battery comprising an electrode assembly, a cover plate assembly 3, and a housing 4. Two second electrode assemblies 2 are symmetrically arranged on both sides of a first electrode assembly 1 in a first direction X. The extension direction of the second electrode assembly 2 is obliquely intersecting the first direction X. The end face of the second electrode assembly 2 facing away from the first electrode assembly 1 is provided with a tab 22 and a mounting groove 23, with the tab 22 disposed in the mounting groove 23. The cover plate assembly 3 includes a cover plate body 31 and a terminal post 32. The cover plate body 31 is disposed on the end face of the second electrode assembly 2 facing away from the first electrode assembly 1 and is fitted to the end of the second electrode assembly 2. The terminal post 32 is disposed on the cover plate body 31 and is electrically connected to the tab 22. The housing 4 and the cover plate body 31 enclose a space for accommodating the first electrode assembly 1 and the second electrode assembly 2. The housing 4 is shaped to resemble the electrode assembly. The first direction X is the length direction of the first electrode assembly 1.

[0037] In this embodiment, conductive coatings are provided on both end faces of the first electrode group 1 and the end faces of the two second electrode groups 2 facing the first electrode group 1, so that the first electrode group 1 and the second electrode group 2 can be electrically connected. The assembly groove 23 extends along the width direction of the second electrode group 2. The shape of the cover plate body 31 is adapted to the shape of the end of the second electrode group 2, and the cover plate body 31 is snapped into the second electrode group 2. The pole post 32 is recessed in the assembly groove 23. The cover plate body 31 and the housing 4 are sealed and fixedly connected by welding. The surface of the cover plate body 31 facing away from the second electrode group 2 protrudes from the pole post 32, and the shape of the housing 4 is adapted to the first electrode group 1 and the second electrode group 2, so that the housing 4 is snapped into the first electrode group 1 and the second electrode group 2.

[0038] Thus, by placing the tab 22 at the end of the second electrode group 2, the space at the end of the second electrode group 2 can be fully utilized. The first electrode group 1 and the second electrode group 2 are assembled and electrically connected, which can improve assembly efficiency, increase battery flexibility, save assembly space, facilitate adaptation to the assembly space of the car chassis, facilitate the series and parallel connection of multiple batteries, improve the grouping rate and the battery overcurrent capacity. The cover plate body 31 is snapped into the end of the second electrode group 2, which can improve the connection stability between the cover plate body 31 and the second electrode group 2, thereby improving the structural strength of the battery.

[0039] See Figure 3 In some embodiments, the end face of the second electrode group 2 facing away from the first electrode group 1 is provided with two first assembly parts 21 and one second assembly part 24. The two first assembly parts 21 are respectively provided on both sides of the assembly groove 23 in its length direction, and the second assembly part 24 is provided in the assembly groove 23. The end face of the second electrode group 2 is provided with two electrode tabs 22, and the two electrode tabs 22 are respectively provided on both sides of the second assembly part 24 in the second direction Y. The second direction Y is the thickness direction of the first electrode group 1, and the first direction X is perpendicular to the second direction Y.

[0040] In this embodiment, the first assembly part 21 and the second assembly part 24 are both integrally formed and disposed at the end of the second electrode group 2. The second assembly part 24 protrudes from the first assembly part 21. The cover plate assembly 3 also includes a first connecting plate 33, a second connecting plate 34, a first plastic 35, and a second plastic 36. The first connecting plate 33 is disposed on the side of the cover plate body 31 away from the second electrode group 2, the second connecting plate 34 is disposed on the side of the cover plate body 31 facing the second electrode group 2, the first plastic 35 is disposed between the first connecting plate 33 and the cover plate body 31, and the second plastic 36 is disposed between the second connecting plate 34 and the cover plate body 31 to improve the cover plate assembly. Regarding the insulation performance of component 3, the pole post 32 is connected to both the first connecting plate 33 and the second connecting plate 34. The cover plate body 31 has a snap-fit ​​part 311 whose shape is adapted to the second assembly part 24 so that the snap-fit ​​part 311 fits snugly with the second assembly part 24. The snap-fit ​​part 311 passes through the first connecting plate 33. Two pole posts 32 are respectively provided on both sides of the snap-fit ​​part 311 in the second direction Y. The second assembly part 24 has a pole lug 22 on both sides in the second direction Y. A pole post 32 is connected to each end of the pole lug 22 on the same side. The cover plate body 31 protrudes from the surface of the second pole group 2 and is positioned away from the first connecting plate 33.

[0041] Thus, the first assembly part 21 can not only increase the battery's capacity, but also improve the protection of the terminal posts 32 in the assembly slot 23, avoiding bumps and damage during transportation, assembly and other processes. The second assembly part 24 can utilize the space between the two terminals 22 to further increase the battery's capacity, and reserve sufficient assembly space on both sides to facilitate the assembly of the cover plate assembly 3 and the connection between multiple batteries, thereby improving the battery's space utilization and structural strength. The first connecting plate 33 can improve the battery's overcurrent capacity, enabling the battery to adapt to the fast charging requirements of high rate and high capacity.

[0042] It is understandable that the number and location of poles 32 can be adjusted according to actual needs, which will not be elaborated here.

[0043] See Figure 3 and Figure 9In some embodiments, the housing 4 includes a connecting surface 41, which includes a first surface 411, a second surface 412, and a third surface 413. The two ends of the second surface 412 are connected to the first surface 411 and the third surface 413, respectively. The first surface is disposed on the end face of the first assembly part 21 in the length direction of the second pole group 2. The second surface 412 and the third surface 413 are disposed on the bottom wall of the assembly groove 23. Along the length direction of the second pole group 2, the distance between the first surface 411 and the third surface is H, and satisfies 12mm≤H≤60mm. The first surface 411 and the first assembly part 21 are disposed in a one-to-one correspondence. The distance between the two first surfaces 411 is L1. The housing 4 includes a first part (not shown in the figure) and a second part (not shown in the figure). The first pole group 1 is disposed in the first part, and the second pole group 2 is disposed in the second part. The width of the second part is A, and satisfies 0.5≤L1 / A≤0.75.

[0044] In this embodiment, the connecting surface is connected to the cover plate body 31. The distance H between the first surface 411 and the third surface can be any value between 12mm and 60mm or any range between any two values, such as 12mm, 20mm, 40mm, 60mm, etc. The ratio of the distance L1 between the two first surfaces 411 to the width A of the second part can be any value between 0.5 and 0.75 or any range between any two values, such as 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, etc.

[0045] In this way, the protective effect of the housing 4 and the cover plate body 31 on the first assembly part 21 can be improved, thereby enabling the first assembly part 21 to protect the terminal post 32. There is enough space between the two first assembly parts 21 to set the terminal post 32 and the first connecting plate 33, and the protective effect on the terminal post 32 and the first connecting plate 33 is improved, avoiding collisions and damage to the terminal post 32 and the first connecting plate 33 during transportation, assembly and other processes, thereby improving the structural strength and safety of the battery.

[0046] Understandably, the distance H between the first surface 411 and the third surface cannot be too small, as this would reduce the size of the first assembly part 21, which would be detrimental to the increase in battery capacity. Conversely, the distance H between the first surface 411 and the third surface cannot be too large, as this would increase the overall size of the battery. The ratio of the distance L1 between the two first surfaces 411 to the width A of the second part cannot be too small, as this would reduce the volume of the assembly slot 23 and the length of the tab 22, affecting the battery's current carrying capacity. Similarly, the ratio of the distance L1 between the two first surfaces 411 to the width A of the second part cannot be too large, as this would reduce the volume of the first assembly part 21 and decrease the increase in battery capacity.

[0047] See Figure 3 and Figure 9In some embodiments, the first assembly part 21 includes an inclined surface 211, which is disposed on the side of the first assembly part 21 facing the pole post 32. The two first assembly parts 21 are symmetrically arranged, and the second surface 412 is disposed corresponding to the inclined surface 211. The included angle between the two second surfaces 412 is N1, and satisfies 60°≤N1≤120°. The included angle between the two second pole groups 2 in the length direction is N2, and satisfies 100°≤N2≤140°.

[0048] In this embodiment, the first assembly part 21 is a right-angled trapezoidal structure. The surface of the first assembly part 21 facing away from the assembly groove 23 is flush with the side of the second pole group 2. The assembly groove 23 is an isosceles trapezoidal groove. The inclined surfaces 211 of the two first assembly parts 21 are the groove walls of the assembly groove 23. The included angle N1 of the two second surfaces 412 can be any value between 60° and 120° or any range between any two values, such as 60°, 80°, 100°, 120°, etc. The shell 4 is formed by stamping and bending to fit in place with both the first pole group 1 and the second pole group 2. The included angle N2 of the length direction of the two second pole groups 2 can be any value between 100° and 140° or any range between any two values, such as 100°, 110°, 120°, 130°, 140°, etc.

[0049] Thus, the inclined surface 211 can guide the cover plate body 31 to be assembled to the second electrode group 2, improve assembly efficiency, and increase the volume of the assembly groove 23, so that the first electrode tab 22 has sufficient length, improve the battery's current carrying capacity, and give the cover plate assembly 3 sufficient assembly space, avoid assembly interference between the structures, make full use of the end space of the second electrode group 2, improve the battery's space utilization rate and make the battery structure more compact, which is conducive to the connection of multiple batteries and improves the assembly ratio and grouping rate.

[0050] Understandably, the included angle N1 between the two second surfaces 412 cannot be too small, as this would encroach on the assembly space and hinder the assembly of the pole post 32 and the first connecting plate 33. Conversely, the included angle N1 between the two second surfaces 412 cannot be too large, as this would reduce the size of the first assembly part 21 and affect the increase in battery capacity. The included angle N2 between the two second pole groups 2 along their length cannot be too small, as this would increase the processing difficulty of the housing 4. Similarly, the included angle N2 between the two second pole groups 2 along their length cannot be too large, as this would reduce the connection stability between the housing 4 and the second pole group 2. The included angle N2 between the two second pole groups 2 along their length can be adjusted according to the space under the vehicle to improve the battery's adaptability.

[0051] See Figure 3 and Figure 7In some embodiments, the housing 4 has an opening 42, which includes a first opening 421 and a second opening 422 disposed opposite to each other on both sides of the first pole group 1 in the third direction Z. The housing 4 is connected to a first mounting plate 43 and a second mounting plate 44. The first mounting plate 43 is disposed in the first opening 421, and the second mounting plate 44 is disposed in the second opening 422. Both the first mounting plate 43 and the second mounting plate 44 are connected to the housing 4. The third direction Z is the width direction of the first pole group 1, and any two of the first direction X, the second direction Y and the third direction Z are perpendicular.

[0052] In this embodiment, the first electrode group 1 is a plate-shaped structure that is wider at the top and narrower at the bottom. The first mounting plate 43 and the second mounting plate 44 are both sealed and fixedly connected to the housing 4 by welding. The first mounting plate 43 and the second mounting plate 44 extend along the extension direction of the first electrode group 1.

[0053] Thus, by setting the first mounting plate 43 and the second mounting plate 44, the processing difficulty of the housing 4 can be reduced, and the first electrode group 1 and the second electrode group 2 can be easily installed in the housing, thereby improving assembly efficiency and structural strength of the housing 4. This prevents deformation caused by external forces during assembly and use, and enables the first electrode group 1 and the second electrode group 2 to be stably connected, thereby improving battery yield and stability.

[0054] It is understandable that the shape of the first pole group 1 can be adjusted according to actual needs, which will not be elaborated here.

[0055] See Figures 6 to 8 In some embodiments, the length of the first mounting plate 43 is greater than the length of the second mounting plate 44, and the first mounting plate 43 is provided with a limiting step 431 that engages with the housing 4. In this embodiment, the limiting step 431 engages with the first opening 421 corresponding to the housing 4.

[0056] Thus, the limiting step 431 is engaged with the housing 4, which can improve the connection strength and assembly accuracy between the first mounting plate 43 and the housing 4, so that the first mounting plate 43 and the housing 4 can protect the first electrode group 1, prevent the first electrode group 1 from moving around in the housing 4, improve the safety performance and structural strength of the battery, and prevent damage from external forces.

[0057] It is understandable that a limit step 431 can also be provided on the second mounting plate 44. The number and location of the limit step 431 can be adjusted according to actual needs, which will not be elaborated here.

[0058] See Figure 9 and Figure 10In some embodiments, along the first direction X, the length of the first mounting plate 43 is W1, the length of the housing 4 on the projection plane perpendicular to the third direction Z is E, and satisfies 0.25≤W1 / E≤0.45, and the width of the housing 4 on the projection plane perpendicular to the third direction Z is B, and satisfies 20mm≤B≤120mm.

[0059] In this embodiment, the ratio of the length W1 of the first mounting plate 43 to the length E of the housing 4 on the projection plane perpendicular to the third direction Z can be any value between 0.25 and 0.45 or any range between any two values, such as 0.25, 0.3, 0.35, 0.4, 0.45, etc.; the width B of the housing 4 on the projection plane perpendicular to the third direction Z can be any value between 20mm and 120mm or any range between any two values, such as 20mm, 40mm, 60mm, 80mm, 100mm, 120mm, etc.

[0060] Thus, the first mounting plate 43 can enhance the structural strength of the first opening 421 of the housing 4 and protect the first electrode group 1, improve the stability of the battery, and facilitate the assembly of the first electrode group 1. When the first electrode group 1 is assembled into the housing 4, the first mounting plate 43 is connected to the housing 4, which can limit the position of the first electrode group 1 in the housing 4 and prevent it from moving around.

[0061] Understandably, the ratio of the length W1 of the first mounting plate 43 to the length E of the housing 4 projected onto the plane perpendicular to the third direction Z cannot be too small, as this would increase the processing difficulty of the housing 4 and reduce assembly efficiency. Similarly, the ratio of the length W1 of the first mounting plate 43 to the length E of the housing 4 projected onto the plane perpendicular to the third direction Z cannot be too large, as this would increase the welding length and raise costs. The width B of the housing 4 projected onto the plane perpendicular to the third direction Z cannot be too small, as this would result in a smaller electrode assembly size, which would be detrimental to increasing the battery capacity. Conversely, the width B of the housing 4 projected onto the plane perpendicular to the third direction Z cannot be too large, as this would affect the space utilization rate of the battery.

[0062] See Figure 3 and Figure 9 In some embodiments, along the first direction X, the length of the second mounting plate 44 is W2, and satisfies 5mm≤W1-W2≤30mm, and along the length direction of the second pole group 2, the length of the second part is L2, and satisfies 1≤L2 / W1≤2.

[0063] In this embodiment, the difference between the length W1 of the first mounting plate 43 and the length W2 of the second mounting plate 44 can be any value between 5mm and 30mm or any range between any two values, such as 5mm, 10mm, 20mm, 30mm, etc.; the ratio of the length L2 of the second part to the length W1 of the first mounting plate 43 can be any value between 1 and 2 or any range between any two values, such as 1, 1.2, 1.4, 1.6, 1.8, 2, etc.

[0064] In this way, the first electrode group 1 and the second electrode group 2 can have sufficient volume to improve the battery capacity and assembly ratio. The second electrode group 2 is symmetrically arranged on both sides of the first electrode group 1, which can make the overall battery more uniformly stressed, avoid local stress concentration that could damage the battery, improve the battery yield, and make full use of the position of the end of the second electrode group 2 to set the cover plate assembly 3, avoiding assembly interference between the cover plate assembly 3 and the first electrode group 1 and the second electrode group 2, thus improving space utilization.

[0065] Understandably, the difference between the length W1 of the first mounting plate 43 and the length W2 of the second mounting plate 44 cannot be too small. If it is too small, it will easily cause scratches and assembly interference during the assembly of the first electrode group 1, affecting the battery performance. The difference between the length W1 of the first mounting plate 43 and the length W2 of the second mounting plate 44 cannot be too large. If it is too large, it will result in insufficient structural strength of the casing 4, thereby reducing the structural strength of the battery.

[0066] See Figure 3 and Figure 9 In some embodiments, the bending radius at the connection between the second mounting plate 44 and the second part is R, and satisfies 10mm≤R≤60mm. The wall thickness of the first mounting plate 43 is T1, and the wall thickness of the housing 4 is T2, and satisfies 0.35mm≤T1-T2≤1mm.

[0067] In this embodiment, the bending radius R at the connection between the second mounting plate 44 and the second part can be any value between 10mm and 60mm or any range between any two values, such as 10mm, 20mm, 30mm, 40mm, 50mm, 60mm, etc.; the difference between the wall thickness T1 of the first mounting plate 43 and the wall thickness T2 of the shell 4 can be any value between 0.35mm and 1mm or any range between any two values, such as 0.35mm, 0.5mm, 0.7mm, 1mm, etc.

[0068] Thus, the stamping and bending of the housing 4 facilitates the processing of the housing 4, disperses the stress at the connection between the first electrode group 1 and the second electrode group 2, avoids stress concentration causing deformation and cracking of the housing 4, and gives the housing 4 sufficient structural strength to prevent deformation under external forces during assembly and use, improves the protection effect on the first electrode group 1 and the second electrode group 2, and enables the battery to adapt to the space under the vehicle, thereby improving space utilization.

[0069] Understandably, the bending radius R at the connection between the second mounting plate 44 and the second part cannot be too small, as this would increase the processing difficulty of the housing 4. Conversely, the bending radius R at the connection between the second mounting plate 44 and the second part cannot be too large, as this would increase the battery size and affect space utilization. The difference between the wall thickness T1 of the first mounting plate 43 and the wall thickness T2 of the housing 4 cannot be too small, as this would increase the welding difficulty. Similarly, the difference between the wall thickness T1 of the first mounting plate 43 and the wall thickness T2 of the housing 4 cannot be too large, as this would affect space utilization.

[0070] See Figure 3 and Figure 6 In some embodiments, the battery further includes an explosion-proof valve 5, which is disposed on the first mounting plate 43 and / or the second mounting plate 44. In this embodiment, two explosion-proof valves 5 are provided, which are respectively disposed in the middle of the first mounting plate 43 and the middle of the second mounting plate 44, and both explosion-proof valves 5 extend along the extending direction of the first electrode group 1.

[0071] In this way, the space on the side of the first electrode group 1 can be fully utilized, so that the battery can release gas in time when thermal runaway occurs, and avoid assembly interference between the explosion-proof valve 5 and the cover plate assembly 3, thereby improving the safety of the battery and the space utilization rate, and making the battery structure more compact.

[0072] It is understandable that the location and number of explosion-proof valves 5 can be adjusted according to actual needs, which will not be elaborated here.

[0073] To verify the rationality of the following parameters: distance H between the first surface 411 and the third surface; ratio of the distance L1 between the two first surfaces 411 to the width A of the second part; ratio of the length W1 of the first mounting plate 43 to the length E of the housing 4 on the projection plane perpendicular to the third direction Z; difference between the length W1 of the first mounting plate 43 and the length W2 of the second mounting plate 44; ratio of the length L2 of the second part to the length W1 of the first mounting plate 43; bending radius R at the connection between the second mounting plate 44 and the second part; angle N1 between the two second surfaces 412; angle N2 between the length directions of the two second pole groups 2; width B of the housing 4 on the projection plane perpendicular to the third direction Z; and the range of the difference between the wall thickness T1 of the first mounting plate 43 and the wall thickness T2 of the housing 4, as shown in Table 1, this embodiment provides six sets of embodiments and six sets of comparative examples for illustration.

[0074] Table 1

[0075]

[0076] As can be seen from Examples 1 to 6 in Table 1, after the range limitation is met, the battery yield meets the requirements. No abnormalities such as assembly deviation of the shell 4 and cover plate assembly 3 or low structural strength are found. There is no damage or deformation at the bending position of the shell 4, the first mounting plate 43, the second mounting plate 44, the electrode group, etc. The battery temperature and exhaust time meet the battery requirements.

[0077] As can be seen from Comparative Example 1, when the ratio of the distance L1 between the two first surfaces 411 to the width A of the second part is too small, the battery yield does not meet the requirements, the size of the assembly slot 23 is insufficient, reducing the space of the second electrode group 2 and the tab 22, making it difficult to meet the battery fast charging overcurrent requirements.

[0078] As can be seen from Comparative Example 2, when the ratio of the distance L1 between the two first surfaces 411 to the width A of the second part is too large, the battery yield does not meet the requirements, the size of the assembly slot 23 is too large, reducing the space of the riveting area on both sides and reducing the increase in battery capacity.

[0079] As can be seen from Comparative Example 3, when the ratio of the length W1 of the first mounting plate 43 to the length E of the housing 4 on the projection plane perpendicular to the third direction Z is too small, the battery yield does not meet the requirements. The size ratio of the first mounting plate 43 is insufficient, which increases the processing difficulty of the housing 4 and is also not conducive to the assembly of the first electrode group 1 and the second electrode group 2.

[0080] As shown in Comparative Example 4, when the ratio of the length W1 of the first mounting plate 43 to the length E of the housing 4 projected onto the plane perpendicular to the third direction Z is too large, the battery yield does not meet the requirements. The excessive size of the first mounting plate 43 reduces the structural strength of the housing 4, making it prone to deformation. Increasing the welding length between the housing 4 and the first mounting plate 43 increases costs.

[0081] As can be seen from Comparative Example 5, when the difference between the length W1 of the first mounting plate 43 and the length W2 of the second mounting plate 44 is too small, the battery yield does not meet the requirements. The length difference between the upper and lower parts of the casing 4 is insufficient, and scratches and interference are likely to occur during the assembly of the first electrode group 1, affecting battery performance and production efficiency.

[0082] As can be seen from Comparative Example 6, when the difference between the length W1 of the first mounting plate 43 and the length W2 of the second mounting plate 44 is too large, the battery yield does not meet the requirements. The difference between the upper and lower lengths of the casing 4 is too large, the overall structural strength of the casing 4 is poor, the upper and lower dimensions of the first electrode group 1 are significantly different, and the overall utilization rate and structural strength of the electrode are low.

[0083] 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: The pole group includes a first pole group (1) and two second pole groups (2). The two second pole groups (2) are symmetrically arranged on both sides of the first pole group (1) in a first direction (X). The length direction of the second pole group (2) is obliquely intersecting the first direction (X). The end face of the second pole group (2) away from the first pole group (1) is provided with a tab (22) and a mounting groove (23). The tab (22) is disposed in the mounting groove (23). The cover plate assembly (3) includes a cover plate body (31) and a pole post (32). The cover plate body (31) is disposed on the end face of the second pole group (2) away from the first pole group (1). The pole post (32) is electrically connected to the tab (22). The housing (4) and the cover plate body (31) enclose a space for accommodating the first pole group (1) and the second pole group (2), and the housing (4) conforms to the shape of the pole group; The first direction (X) is the length direction of the first pole group (1).

2. The battery according to claim 1, characterized in that, The second electrode group (2) has two first assembly parts (21) and one second assembly part (24) on its end face away from the first electrode group (1). The two first assembly parts (21) are respectively disposed on both sides of the assembly groove (23) in its length direction. The second assembly part (24) is disposed in the assembly groove (23). The end face of the second electrode group (2) has two electrode tabs (22). The two electrode tabs (22) are respectively disposed on both sides of the second assembly part (24) in the second direction (Y). The second direction (Y) is the thickness direction of the first pole group (1), and the first direction (X) is perpendicular to the second direction (Y).

3. The battery according to claim 2, characterized in that, The housing (4) includes a connecting surface (41), which includes a first surface (411), a second surface (412), and a third surface (413). The two ends of the second surface (412) are connected to the first surface (411) and the third surface (413) respectively. The first surface (411) is provided on the end face of the first assembly part (21) along the length direction of the second pole group (2). The second surface (412) and the third surface (413) are provided on the bottom wall of the assembly groove (23) along the length direction of the second pole group (2). The distance between the first surface (411) and the third surface (413) is H, and satisfies 12mm≤H≤60mm; and / or, the first surface (411) and the first assembly part (21) are arranged in a one-to-one correspondence, and the distance between the two first surfaces (411) along the width direction of the second pole group (2) is L1. The housing (4) includes a first part and a second part, the first pole group (1) is disposed in the first part, the second pole group (2) is disposed in the second part, the width of the second part is A, and satisfies 0.5≤L1 / A≤0.

75.

4. The battery according to claim 3, characterized in that, The first assembly part (21) includes an inclined surface (211), which is disposed on the side of the first assembly part (21) facing the pole post (32). The two first assembly parts (21) are symmetrically arranged. The second surface (412) is disposed corresponding to the inclined surface (211). The included angle between the two second surfaces (412) is N1, and satisfies 60°≤N1≤120°; and / or, the included angle in the length direction of the two second pole groups (2) is N2, and satisfies 100°≤N2≤140°.

5. The battery according to any one of claims 1-4, characterized in that, The housing (4) has an opening (42), which includes a first opening (421) and a second opening (422) disposed opposite to each other on both sides of the first pole group (1) in a third direction (Z). The housing (4) is connected to a first mounting plate (43) and a second mounting plate (44). The first mounting plate (43) is disposed in the first opening (421), and the second mounting plate (44) is disposed in the second opening (422). Both the first mounting plate (43) and the second mounting plate (44) are connected to the housing (4). The third direction (Z) is the width direction of the first pole group (1), and the first direction (X) is perpendicular to the third direction (Z).

6. The battery according to claim 5, characterized in that, The length of the first mounting plate (43) is greater than the length of the second mounting plate (44), and the first mounting plate (43) is provided with a limiting step (431) that is engaged with the housing (4).

7. The battery according to claim 5, characterized in that, Along the first direction (X), the length of the first mounting plate (43) is W1, the length of the housing (4) on the projection plane perpendicular to the third direction (Z) is E, and satisfies 0.25≤W1 / E≤0.45; and / or, the width of the housing (4) on the projection plane perpendicular to the third direction (Z) is B, and satisfies 20mm≤B≤120mm.

8. The battery according to claim 5, characterized in that, Along the first direction (X), the length of the first mounting plate (43) is W1, the length of the second mounting plate (44) is W2, and 5mm≤W1-W2≤30mm is satisfied; and / or, the housing (4) includes a first part and a second part, the first pole group (1) is disposed in the first part, the second pole group (2) is disposed in the second part, and along the length direction of the second pole group (2), the length of the second part is L2, and 1≤L2 / W1≤2 is satisfied.

9. The battery according to claim 5, characterized in that, The housing (4) includes a first part and a second part. The first pole group (1) is disposed in the first part, and the second pole group (2) is disposed in the second part. The bending radius at the connection between the second mounting plate (44) and the second part is R, and satisfies 10mm≤R≤60mm; and / or, the wall thickness of the first mounting plate (43) is T1, and the wall thickness of the housing (4) is T2, and satisfies 0.35mm≤T1-T2≤1mm.

10. The battery according to claim 5, characterized in that, The battery also includes an explosion-proof valve (5), which is disposed on the first mounting plate (43) and / or the second mounting plate (44).

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