Battery cover plate structure and battery

Abstract

The utility model relates to the technical field of lithium batteries, and discloses a battery cover plate structure and a battery. The two pole columns are riveted and fixed with the cover plate body, and an insulating component is arranged between the pole columns and the cover plate body for insulation; one end of the connecting sheet along the third direction is suitable for being welded with the pole, and the other end is suitable for being welded with the tab unit; two through holes are formed in the cover plate body, and the through holes are suitable for avoiding welding of the connecting sheets and the tab units; the width of the through hole along the third direction is F, F is greater than or equal to T, and T is the width of the tab unit along the third direction; the distance between the two sides of the second direction of the through hole and the edge of the cover plate body is A, A is larger than or equal to 3 mm, and / or 2 * A is larger than or equal to 1 / 3 * W, and W is the total width of the cover plate body in the second direction. According to the battery cover plate structure provided by the utility model, the strength of the cover plate and the overcurrent of the battery can be considered at the same time.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium batteries, and particularly relates to a battery cover plate structure and a battery. Background Art

[0002] With the increasing maturity of lithium-ion battery technology, lithium-ion batteries, as power batteries, are widely used in electric vehicles and energy storage fields, and the requirements for the use performance and safety of lithium-ion batteries are increasing day by day. The lithium battery cover plate is a core component for safety and assembly, and its structural design is crucial for the safety of the battery core. However, the existing lithium battery cover plates cannot simultaneously take into account the strength of the cover plate and the overcurrent of the battery, and the reliability of the battery needs to be improved. Summary of the Utility Model

[0003] In view of this, the utility model provides a battery cover plate structure and a battery to solve the problem that the existing lithium battery cover plates cannot simultaneously take into account the strength of the cover plate and the overcurrent of the battery.

[0004] In a first aspect, the utility model provides a battery cover plate structure, including:

[0005] A cover plate body, which is disposed opposite to the pole group module in a first direction; two pole ear units are disposed on one side of the pole group module facing the cover plate body in the first direction;

[0006] Two pole columns, which are riveted and fixed to the cover plate body, and an insulating component is disposed between the pole columns and the cover plate body for insulation; the pole columns and the pole ear units are staggered in position in the first direction; a connecting piece, one end of which is adapted to be welded to the pole column along a third direction, and the other end is adapted to be welded to the pole ear unit;

[0007] Two through holes are formed in the cover plate body, and the through holes are disposed opposite to the pole ear units in the first direction, and the through holes are adapted to avoid the welding of the connecting piece and the pole ear unit;

[0008] The width of the through hole in the third direction is F, and F satisfies F≥T, where T is the width of the pole ear unit in the third direction;

[0009] The distance between the two sides of the through hole in the second direction and the edge of the cover plate body is A, and A satisfies A≥3mm, and / or, 2×A≥1 / 3×W, where W is the total width of the cover plate body in the second direction.

[0010] Beneficial effects: The battery cover plate structure provided by the present utility model forms two through holes on the cover plate body, and the two through holes are arranged at intervals along the third direction on the cover plate body, so that the part of the cover plate body between the two through holes can be connected together to bear force jointly, thereby ensuring the structural strength of the cover plate body; the width F of the through hole along the third direction satisfies F≥T, where T is the width of the tab unit along the third direction. At the same time, the distance A between the two sides of the through hole in the second direction and the edge of the cover plate body satisfies A≥3mm, and / or 2×A≥1 / 3×W, where W is the total width of the cover plate body along the second direction. This can not only ensure sufficient welding area between the tab unit and the connecting piece, thus ensuring the current-carrying area between the tab unit and the connecting piece, and further ensuring the overcurrent of the battery, but also ensure the anti-deformation ability of the cover plate body, guarantee the structural strength and stability of the cover plate body, and further take into account both the strength of the cover plate and the overcurrent of the battery simultaneously.

[0011] In an optional embodiment, a liquid injection hole is further provided on the cover plate body, and the liquid injection hole is arranged between the two through holes;

[0012] The distance B between the through hole and the liquid injection hole along the third direction satisfies B≥4.5mm.

[0013] Beneficial effects: It can not only ensure sufficient space during liquid injection, but also avoid the collapse of the upper edge of the liquid injection hole when the liquid injection hole is punched, thus ensuring the fullness of the manufacturing process of the liquid injection hole.

[0014] In an optional embodiment, the battery cover plate structure further includes a sealing plate, the sealing plate is welded to the cover plate body, and the sealing plate is suitable for closing the through hole.

[0015] Beneficial effects: The through hole provides a welding channel for the welding of the tab unit and the connecting piece. After the tab unit and the connecting piece are welded, the two sealing plates are then welded to the cover plate body, so as to close the two through holes through the two sealing plates and realize the sealing of the cover plate body.

[0016] In an optional embodiment, the distance C between the two through holes along the third direction satisfies C≥2×B + D, where D is the maximum outer diameter of the liquid injection hole.

[0017] Beneficial effects: Thus, it can ensure the anti-deformation ability of the cover plate body, ensure the structural stability of the cover plate body, avoid mutual influence when the two sealing plates are welded to the cover plate body, and prevent the cover plate body from deforming.

[0018] In an optional embodiment, the pole column includes a riveting part, and the riveting part is arranged on the side of the cover plate body away from the pole group module along the first direction;

[0019] The insulating component includes a first insulating member disposed between the riveting portion and the cover plate body. The first insulating member is adapted to insulate between the pole column and the cover plate body.

[0020] The distance between the through-hole and the first insulating member in the third direction is E, and E satisfies E≥3mm.

[0021] Beneficial effects: It can not only avoid the deformation of the first insulating member caused by the welding heat during the welding of the sealing plate and the cover plate body, thus ensuring the sealing between the pole column and the cover plate body, but also avoid the deformation of the cover plate body during the riveting process of the pole column and the cover plate body, ensure the flatness of the cover plate body, and effectively prevent the cover plate body from cracking.

[0022] In an alternative embodiment, rounded corners are formed between every two adjacent inner walls of the through-hole to form a transition portion, and the radius of the transition portion is R, and R satisfies R≥2mm.

[0023] Beneficial effects: It can not only avoid the accumulation of welding energy and the occurrence of pores in the melting zone, thus ensuring the stability, reliability and product performance during welding, but also ensure the yield rate of the stamping process, facilitate the manufacturing and processing of the mold, and avoid the wear of the punch.

[0024] In an alternative embodiment, the area of a single through-hole is S, and S satisfies 2×S≤1 / 3×W×L, where L is the total length of the cover plate body in the third direction.

[0025] Beneficial effects: Thus, the structural strength of the cover plate body is ensured.

[0026] In a second aspect, the present utility model further provides a battery, including: a pole group module, and the battery cover plate structure as described above;

[0027] The pole group module includes two pole ear units, and the pole ear unit has a first state vertically disposed in the first direction and a second state disposed at an angle with the first direction after being bent.

[0028] The pole ear unit is adapted to extend to the side of the connecting piece away from the pole group module in the first direction in the first state; the pole ear unit is adapted to be welded to the connecting piece in the second state.

[0029] Beneficial effects: By forming two through-holes in the cover plate body, on the one hand, it provides an operating space for the bending of the pole ear unit, and on the other hand, it provides a welding space for the welding of the pole ear unit and the connecting piece, eliminating the bending process of the connecting piece, reducing the space occupation of the pole ear unit and the connecting piece in the first direction, improving the internal space utilization rate of the battery, and improving the production efficiency; at the same time, it ensures the structural stability of the cover plate body and the reliability of the battery.

[0030] In an alternative embodiment, the connecting piece includes a first connecting portion and a second connecting portion. The first connecting portion is adapted to be welded to the pole post; the second connecting portion extends from the first connecting portion in a third direction towards the pole ear unit; the second connecting portion includes a first welding area and a second welding area, and the first welding area and the second welding area are arranged opposite to each other in a second direction;

[0031] The pole ear unit includes a first pole ear and a second pole ear. The first pole ear and the second pole ear are arranged opposite to each other in a second direction. The first pole ear is adapted to be penetration-welded to the first welding area in the second state, and the second pole ear is adapted to be penetration-welded to the second welding area in the second state.

[0032] Beneficial effects: The connecting piece is welded to the pole post through the first connecting portion, so as to form an integral structural module with the cover body, the pole post and the insulating component, which is convenient for overall supply and assembly and improves production efficiency. After the pole group module is put into the shell, the first pole ear and the second pole ear extend in a first direction to the side of the second connecting portion away from the pole group module. The second connecting portion is located between the first pole ear and the second pole ear. The first pole ear and the second pole ear are bent to the second state, and finally the first pole ear is penetration-welded to the first welding area, and the second pole ear is penetration-welded to the second welding area, without bending the connecting piece, which not only improves the space utilization rate inside the battery, but also improves production efficiency.

[0033] In an alternative embodiment, the battery further includes a housing module, and the housing module includes a housing body and an explosion-proof valve;

[0034] The housing body includes a bottom wall and a side wall extending from the peripheral edge of the bottom wall in a first direction away from the bottom wall. The side wall and the bottom wall jointly enclose a receiving cavity, and the receiving cavity is adapted to receive the pole group module;

[0035] The bottom wall and the cover body are arranged opposite to each other in a first direction, and an explosion-proof port is formed on the bottom wall; the explosion-proof valve is welded to the bottom wall, and the explosion-proof valve is adapted to seal the explosion-proof port.

[0036] Beneficial effects: By providing a liquid injection hole on the cover body and an explosion-proof valve on the bottom wall of the housing body, the explosion-proof valve and the liquid injection hole are respectively arranged on two sides of the first direction of the battery cell housing, avoiding the pollution of the explosion-proof valve by the electrolyte during liquid injection and improving the safety performance of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0038] Figure 1 A perspective view of a battery according to an embodiment of the present utility model;

[0039] Figure 2 is Figure 1 the top view of the battery shown;

[0040] Figure 3 is Figure 2 the cross-sectional view of the P-P section in;

[0041] Figure 4 A perspective view of a battery cover structure with the sealing plate hidden according to an embodiment of the present utility model;

[0042] Figure 5 is Figure 4 the top view of the battery cover structure shown;

[0043] Figure 6 is Figure 5 the cross-sectional view of the Q-Q section in;

[0044] Figure 7 is Figure 6 the partial enlarged schematic view at G in;

[0045] Figure 8 is Figure 3 the cross-sectional view of the housing module in;

[0046] Figure 9 is Figure 8 the partial enlarged schematic view at K in;

[0047] Figure 10 A perspective view of the battery cover structure, the pole group module and the housing module in the first state;

[0048] Figure 11 is Figure 10 the perspective view of the tab unit and the connecting piece in the first state in;

[0049] Figure 12 is Figure 10 the top view of the battery cover structure, the pole group module and the housing module shown;

[0050] Figure 13 is Figure 12 the cross-sectional view of the I-I section in;

[0051] Figure 14 A perspective view of the battery cover structure, the pole group module and the housing module in the second state;

[0052] Figure 15 is Figure 14 the perspective view of the tab unit and the connecting piece in the second state in;

[0053] Figure 16 As shown in Figure 14 the top view of the battery cover plate structure, the pole group module and the housing module;

[0054] Figure 17 As shown in Figure 16 the cross-sectional view of the J-J section in

[0055] Explanation of reference numerals:

[0056] 10. Cover plate body; 101. Through hole; 102. Liquid injection hole; 103. Transition part;

[0057] 20. Terminal post; 21. Riveting part;

[0058] 30. Insulation assembly; 31. First insulation part; 32. Second insulation part; 33. Sealing ring;

[0059] 40. Connecting piece; 41. First connecting part; 42. Second connecting part; 421. First welding area; 422. Second welding area;

[0060] 50. Sealing plate;

[0061] 60. Pole group module; 61. Tab unit; 611. First tab; 612. Second tab;

[0062] 70. Housing module; 71. Housing body; 711. Bottom wall; 7111. Explosion-proof port; 712. Side wall; 72. Explosion-proof valve; 73. Sealing piece. Detailed implementation manners

[0063] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0064] Next, with reference to Figures 1 to 17 , the embodiments of the present invention will be described.

[0065] According to an embodiment of the present invention, on the one hand, a battery cover plate structure is provided, including:

[0066] The cover plate body 10, please refer to Figure 3 shown in the figure, the cover plate body 10 and the pole group module 60 are arranged opposite to each other in a first direction; two tab units 61 are arranged on one side of the pole group module 60 facing the cover plate body 10 in the first direction;

[0067] Two pole columns 20 are riveted and fixed to the cover plate body 10, and an insulating component 30 is arranged between the pole column 20 and the cover plate body 10 for insulation; the pole column 20 and the tab unit 61 are offset and aligned in the first direction; a connecting piece 40, one end of which is adapted to be welded to the pole column 20 along the third direction, and the other end is adapted to be welded to the tab unit 61;

[0068] Please refer to Figure 6 As shown, two through holes 101 are formed in the cover plate body 10, and the through holes 101 and the tab unit 61 are arranged opposite to each other in the first direction. The through holes 101 are adapted to avoid the welding of the connecting piece 40 and the tab unit 61;

[0069] Please refer to Figure 16 As shown, the width of the through hole 101 in the third direction is F, and F satisfies F≥T, where T is the width of the tab unit 61 in the third direction;

[0070] Please refer to Figure 5 As shown, the distance between the two sides of the through hole 101 in the second direction and the edge of the cover plate body 10 is A, and A satisfies A≥3mm, and / or, 2×A≥1 / 3×W, where W is the total width of the cover plate body 10 in the second direction.

[0071] It should be noted that by riveting and fixing the cover plate body 10 and the pole column 20, an insulating component 30 is arranged between the pole column 20 and the cover plate body 10 for insulation, and the connecting piece 40 is welded to the pole column 20, so that the battery cover plate structure forms an integral structural module, which is convenient for overall supply and assembly and improves production efficiency. Please refer to Figure 4 As shown, two pole columns 20 are arranged on the cover plate body 10, one of which is used as the positive pole column and the other is used as the negative pole column; two through holes 101 are formed in the cover plate body 10, one of the through holes 101 is arranged at an interval from the positive pole column in the third direction, and the other through hole 101 is arranged at an interval from the negative pole column in the third direction; the two through holes 101 are arranged at an interval in the third direction, so that the part of the cover plate body 10 between the two through holes 101 can be connected together, thereby ensuring the structural strength of the cover plate body 10.

[0072] Please refer to Figure 3 As shown, the pole column 20 and the tab unit 61 are offset and aligned in the first direction, avoiding the stacking of the pole column 20 and the tab unit 61 in the first direction, reducing the space occupation of the pole column 20 and the tab unit 61 in the first direction, and improving the space utilization rate inside the battery. By forming two mutually spaced through holes 101 in the cover plate body 10, it can not only ensure the structural strength of the cover plate body 10, but also provide an operating space for the bending of the tab unit 61, and at the same time provide a welding channel for the welding of the connecting piece 40 and the tab unit 61, which is beneficial to reducing the space occupation of the tab unit 61 in the first direction and improving the space utilization rate inside the battery; Please refer toFigure 16 As shown, the width F of the through hole 101 in the third direction satisfies F≥T, where T is the width of the tab unit 61 in the third direction. On the one hand, it enables the tab unit 61 to smoothly pass through the through hole 101 in the first direction, facilitating the bending of the tab unit 61. On the other hand, it can ensure sufficient welding area between the tab unit 61 and the connecting piece 40, thereby guaranteeing the current-carrying area between the tab unit 61 and the connecting piece 40, and further ensuring the overcurrent of the battery.

[0073] Please refer to Figure 5 As shown, the distance between the two sides of the through hole 101 in the second direction and the edge of the cover plate body 10 is A. If A is too small, it is easy to reduce the anti-deformation ability of the cover plate body 10 and affect the structural stability of the cover plate body 10. Therefore, A needs to satisfy A≥3mm, and / or, 2×A≥1 / 3×W, where W is the total width of the cover plate body 10 in the second direction.

[0074] For the battery cover plate structure provided by the present utility model, two through holes 101 are formed by opening on the cover plate body 10, and the two through holes 101 are arranged at intervals in the third direction on the cover plate body 10, so that the part of the cover plate body 10 located between the two through holes 101 can be connected together to bear force jointly, thereby ensuring the structural strength of the cover plate body 10; the width F of the through hole 101 in the third direction satisfies F≥T, where T is the width of the tab unit 61 in the third direction. At the same time, the distance A between the two sides of the through hole 101 in the second direction and the edge of the cover plate body 10 satisfies A≥3mm, and / or, 2×A≥1 / 3×W, where W is the total width of the cover plate body 10 in the second direction. It can not only ensure sufficient welding area between the tab unit 61 and the connecting piece 40, thereby guaranteeing the current-carrying area between the tab unit 61 and the connecting piece 40, and further ensuring the overcurrent of the battery, but also ensure the anti-deformation ability of the cover plate body 10, guarantee the structural strength and stability of the cover plate body 10, and further take into account the strength of the cover plate and the overcurrent of the battery at the same time.

[0075] In some embodiments, please refer to Figure 4 As shown, a liquid injection hole 102 is further opened on the cover plate body 10, and the liquid injection hole 102 is arranged between the two through holes 101;

[0076] Please also combine with Figure 7 As shown, the distance B between the through hole 101 and the liquid injection hole 102 in the third direction satisfies B≥4.5mm.

[0077] It should be noted that if the distance B between the through hole 101 and the liquid injection hole 102 in the third direction is too small, on the one hand, it is easy to cause insufficient space above the cover body 10 during liquid injection, which is not conducive to the progress of the liquid injection process. On the other hand, it is easy to cause the upper edge of the liquid injection hole 102 to collapse when the liquid injection hole 102 is punched, and it is impossible to ensure the fullness of the manufacturing process of the liquid injection hole 102. Therefore, B needs to satisfy B≥4.5mm.

[0078] In this embodiment, by satisfying B≥4.5mm for the distance B between the through hole 101 and the liquid injection hole 102 in the third direction, not only can there be enough space during liquid injection, but also the upper edge of the liquid injection hole 102 can be prevented from collapsing when the liquid injection hole 102 is punched, thereby ensuring the fullness of the manufacturing process of the liquid injection hole 102.

[0079] In some embodiments, please refer to Figure 3 As shown, the battery cover structure further includes a sealing plate 50. The sealing plate 50 is welded to the cover body 10, and the sealing plate 50 is adapted to close the through hole 101.

[0080] In this embodiment, the through hole 101 provides a welding channel for the welding of the tab unit 61 and the connecting piece 40. After the tab unit 61 and the connecting piece 40 are welded, the two sealing plates 50 are welded to the cover body 10, so as to close the two through holes 101 through the two sealing plates 50, realizing the sealing of the cover body 10.

[0081] In some embodiments, please refer to Figure 5 As shown, the distance between the two through holes 101 in the third direction is C. Please also refer to Figure 7 As shown, C satisfies C≥2×B + D, where D is the maximum outer diameter of the liquid injection hole 102.

[0082] It should be noted that the liquid injection hole 102 is arranged between the two through holes 101, and the part of the cover body 10 located between the liquid injection hole 102 and the through hole 101 can bear force together with the entire cover body 10, thereby ensuring the structural strength of the cover body 10. If the distance C between the two through holes 101 in the third direction is too small, it is easy to reduce the anti-deformation ability of the cover body 10, affect the structural stability of the cover body 10, and it is easy for the two sealing plates 50 to affect each other when welded to the cover body 10, resulting in deformation of the cover body 10. Therefore, C needs to satisfy C≥2×B + D, where D is the maximum outer diameter of the liquid injection hole 102.

[0083] In this embodiment, by satisfying C≥2×B + D, where D is the maximum outer diameter of the liquid injection hole 102, for the distance C between the two through holes 101 in the third direction, the anti-deformation ability of the cover body 10 is ensured, the structural stability of the cover body 10 is ensured, the mutual influence between the two sealing plates 50 and the cover body 10 during welding is avoided, and the deformation of the cover body 10 is prevented.

[0084] In some embodiments, refer to Figure 7 As shown, the terminal post 20 includes a riveting portion 21, and the riveting portion 21 is disposed on a side of the cover plate body 10 away from the electrode group module 60 along the first direction;

[0085] The insulating component 30 includes a first insulating member 31, and the first insulating member 31 is disposed between the riveting portion 21 and the cover plate body 10. The first insulating member 31 is adapted to insulate between the terminal post 20 and the cover plate body 10;

[0086] The distance between the through hole 101 and the first insulating member 31 along the third direction is E, and E satisfies E≥3 mm.

[0087] It should be noted that if the distance E between the through hole 101 and the first insulating member 31 along the third direction is too small, on the one hand, the welding heat during the welding of the sealing plate 50 and the cover plate body 10 is likely to cause the first insulating member 31 to deform, affecting the sealing performance between the terminal post 20 and the cover plate body 10. On the other hand, during the riveting process of the terminal post 20 and the cover plate body 10, the cover plate body 10 will be deformed, which is likely to affect the flatness of the cover plate body 10 and even cause the cover plate body 10 to crack. Therefore, E needs to satisfy E≥3 mm.

[0088] In this embodiment, by making the distance E between the through hole 101 and the first insulating member 31 along the third direction satisfy E≥3 mm, not only can the welding heat during the welding of the sealing plate 50 and the cover plate body 10 be avoided from causing the first insulating member 31 to deform, thereby ensuring the sealing performance between the terminal post 20 and the cover plate body 10, but also the deformation of the cover plate body 10 during the riveting process of the terminal post 20 and the cover plate body 10 can be avoided, ensuring the flatness of the cover plate body 10 and effectively preventing the cover plate body 10 from cracking.

[0089] Further, refer to Figure 7 As shown, the insulating component 30 further includes a second insulating member 32, and the second insulating member 32 is disposed on a side of the cover plate body 10 facing the electrode tab unit 61 along the first direction. The second insulating member 32 is adapted to insulate between the cover plate body 10 and the electrode tab unit 61, thereby avoiding internal short circuit of the battery caused by the contact between the cover plate body 10 and the electrode tab unit 61; the insulating component 30 further includes a sealing ring 33, and the sealing ring 33 is coaxially arranged with the terminal post 20. The sealing ring 33 is disposed between the terminal post 20 and the cover plate body 10, and the sealing ring 33 is adapted to seal between the terminal post 20 and the cover plate body 10.

[0090] In some embodiments, refer to Figure 5 As shown, rounded corners are formed at the transition part 103 between every two adjacent inner walls of the through hole 101, and the radius of the transition part 103 is R, and R satisfies R≥2 mm.

[0091] It should be noted that if sharp right angles are formed between every two adjacent inner walls of the through hole 101, on the one hand, it is easy to cause a relatively large change in the path of the welding head (turning a right-angle bend), resulting in the accumulation of welding energy, the appearance of air holes in the melting zone, and affecting the product performance. On the other hand, it is easy to increase the manufacturing and processing difficulty of the mold, and the punch is prone to wear.

[0092] In this embodiment, the radius R of the transition portion 103 satisfies R≥2mm. This can not only avoid the accumulation of welding energy and the appearance of air holes in the melting zone, thus ensuring the stability, reliability and product performance during welding, but also ensure the yield of the punching process, facilitate the manufacturing and processing of the mold, and avoid punch wear.

[0093] In some embodiments, the area of a single through hole 101 is S, and S satisfies 2×S≤1 / 3×W×L, where L is the total length of the cover plate body 10 in the third direction.

[0094] It should be noted that please refer to Figure 5 As shown, W is the total width of the cover plate body 10 in the second direction, L is the total length of the cover plate body 10 in the third direction, and W×L represents the total area of the cover plate body 10; 2×S represents the total area of two through holes 101, and the total area 2×S of the two through holes 101≤1 / 3×W×L, thereby ensuring the structural strength of the cover plate body 10.

[0095] According to an embodiment of the present invention, on the other hand, a battery is also provided, including: a pole group module 60, and the battery cover plate structure as described above;

[0096] The pole group module 60 includes two pole ear units 61, and the pole ear unit 61 has a first state vertically arranged in the first direction and a second state arranged at an angle with the first direction after being bent;

[0097] The pole ear unit 61 is adapted to extend to the side of the connecting piece 40 away from the pole group module 60 in the first direction in the first state; the pole ear unit 61 is adapted to be welded to the connecting piece 40 in the second state.

[0098] It should be noted that please refer to Figures 10 to 13 As shown, when the pole ear unit 61 is in the first state, the pole ear unit 61 is vertically arranged in the first direction, which is the initial state of the pole ear unit 61; please refer to Figures 14 to 17As shown, after the electrode group module 60 is inserted into the case, the tab unit 61 extends along the first direction to the side of the connecting piece 40 away from the electrode group module 60, and then the tab unit 61 is bent at an angle of 90°, so that the tab unit 61 is arranged at an angle with the first direction. At this time, the tab unit 61 is in the second state, and the tab unit 61 and the connecting piece 40 are arranged in contact with each other on the side of the first direction away from the electrode group module 60. Then, the tab unit 61 and the connecting piece 40 are penetration-welded, so that electric energy is led out of the battery through the connecting piece 40.

[0099] The battery provided by the present utility model includes the above-mentioned battery cover structure. Therefore, the battery provided by the present utility model includes all the beneficial effects of the above-mentioned battery cover structure. By forming two through holes 101 in the cover body 10, on the one hand, it provides an operating space for the bending of the tab unit 61, and on the other hand, it provides a welding space for the welding of the tab unit 61 and the connecting piece 40, eliminating the bending process of the connecting piece 40, reducing the space occupied by the tab unit 61 and the connecting piece 40 in the first direction, improving the space utilization rate inside the battery, and improving the production efficiency; at the same time, it ensures the structural stability of the cover body 10 and the reliability of the battery.

[0100] In some embodiments, please refer to Figure 6 As shown, the connecting piece 40 includes a first connecting portion 41 and a second connecting portion 42. The first connecting portion 41 is adapted to be welded to the pole column 20; the second connecting portion 42 extends from the first connecting portion 41 along the third direction towards the tab unit 61; please refer to Figure 11 As shown, the second connecting portion 42 includes a first welding area 421 and a second welding area 422, and the first welding area 421 and the second welding area 422 are arranged opposite to each other along the second direction;

[0101] Please also refer to Figure 15 As shown, the tab unit 61 includes a first tab 611 and a second tab 612. The first tab 611 and the second tab 612 are arranged opposite to each other along the second direction. The first tab 611 is adapted to be penetration-welded to the first welding area 421 in the second state, and the second tab 612 is adapted to be penetration-welded to the second welding area 422 in the second state.

[0102] In this embodiment, the connecting piece 40 includes a first connecting portion 41 and a second connecting portion 42. The connecting piece 40 is welded to the pole column 20 through the first connecting portion 41, so as to form an integral structural module with the cover plate body 10, the pole column 20 and the insulating component 30, which is convenient for overall supply and assembly and improves production efficiency. After the pole group module 60 is put into the shell, the first pole ear 611 and the second pole ear 612 extend in the first direction to the side of the second connecting portion 42 away from the pole group module 60. The second connecting portion 42 is located between the first pole ear 611 and the second pole ear 612. The first pole ear 611 and the second pole ear 612 are bent to the second state, and finally the first pole ear 611 is penetration-welded to the first welding area 421, and the second pole ear 612 is penetration-welded to the second welding area 422, without bending the connecting piece 40, which not only improves the space utilization rate inside the battery, but also improves production efficiency.

[0103] In some embodiments, please refer to Figure 8 as shown, the battery further includes a housing module 70, and the housing module 70 includes a housing body 71 and an explosion-proof valve 72;

[0104] The housing body 71 includes a bottom wall 711 and a side wall 712 extending from the peripheral edge of the bottom wall 711 in the first direction away from the bottom wall 711. The side wall 712 and the bottom wall 711 jointly enclose a receiving cavity, and the receiving cavity is adapted to receive the pole group module 60;

[0105] Please also refer to Figure 3 as shown, the bottom wall 711 and the cover plate body 10 are arranged opposite to each other in the first direction, and an explosion-proof port 7111 is formed on the bottom wall 711; the explosion-proof valve 72 is welded to the bottom wall 711, and the explosion-proof valve 72 is adapted to seal the explosion-proof port 7111.

[0106] In this embodiment, the battery includes the above-mentioned battery cover plate structure and the housing module 70. The housing module 70 includes a housing body 71 and an explosion-proof valve 72, and the bottom wall 711 of the housing body 71 is arranged opposite to the cover plate body 10 in the first direction; by providing a liquid injection hole 102 on the cover plate body 10 and providing an explosion-proof valve 72 on the bottom wall 711 of the housing body 71, the explosion-proof valve 72 and the liquid injection hole 102 are respectively arranged on both sides of the first direction of the battery cell housing, avoiding the pollution of the explosion-proof valve 72 by the electrolyte during liquid injection and improving the safety performance of the battery cell.

[0107] Furthermore, please refer to Figure 9 as shown, the housing module 70 further includes a sealing piece 73. The sealing piece 73 is arranged on the side of the bottom wall 711 away from the pole group module 60 in the first direction. The sealing piece 73 seals the explosion-proof port 7111, thereby preventing foreign objects from entering the explosion-proof port 7111, avoiding the pollution or damage of the explosion-proof valve 72 by foreign objects, ensuring the normal detonation performance of the explosion-proof valve 72, and ensuring the safety of the battery.

[0108] Although embodiments of the present utility model have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present utility model, and such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A battery cover structure, characterized in that: include: The cover plate body is arranged opposite to the pole group module along a first direction; the pole group module is provided with two pole ear units on one side facing the cover plate body along the first direction; Two poles are fixedly riveted to the cover body, and an insulating assembly is arranged between the pole and the cover body for insulation; the pole and the pole lug unit are staggered and aligned along the first direction; a connecting piece, one end of which along the third direction is suitable for welding with the pole, and the other end is suitable for welding with the pole lug unit; The cover plate body is provided with two through holes, the through holes and the tab unit are arranged opposite to each other along a first direction, and the through holes are suitable for avoiding welding between the connecting sheet and the tab unit; The width of the through hole along the third direction is F, F satisfies F≥T, and T is the width of the tab unit along the third direction; The distance between the two sides of the through hole in the second direction and the edge of the cover body is A, A satisfies A≥3mm, and / or 2×A≥1 / 3×W, wherein W is the total width of the cover body along the second direction.

2. The battery cover structure according to claim 1, characterized in that: The cover plate body is also provided with a liquid injection hole, and the liquid injection hole is arranged between the two through holes; A distance between the through hole and the injection hole along the third direction is B, and B satisfies B≥4.5 mm.

3. The battery cover structure according to claim 1, characterized in that: The battery cover plate structure further comprises a sealing plate, which is welded to the cover plate body and is suitable for closing the through hole.

4. The battery cover structure according to claim 2, characterized in that: The distance between the two through holes along the third direction is C, and C satisfies C≥2×B+D, wherein D is the maximum outer diameter of the injection hole.

5. The battery cover structure according to claim 1, characterized in that: The pole comprises a riveted portion, and the riveted portion is arranged on a side of the cover plate body away from the pole group module along the first direction; The insulating assembly comprises a first insulating member, which is disposed between the riveted portion and the cover body, and is suitable for insulating the pole from the cover body; A distance between the through hole and the first insulating member along the third direction is E, and E satisfies E≥3 mm.

6. The battery cover structure according to claim 1, characterized in that: A transition portion is formed by rounding the corners between every two adjacent inner walls of the through hole, and the radius of the transition portion is R, where R satisfies R≥2mm.

7. The battery cover structure according to any one of claims 1 to 6, characterized in that: The area of ​​a single through hole is S, S satisfies 2×S≤1 / 3×W×L, and L is the total length of the cover body along the third direction.

8. A battery, characterized in that: include: A pole group module, and a battery cover structure as described in any one of claims 1 to 7; The pole group module comprises two pole lug units, wherein the pole lug units have a first state of being vertically arranged along a first direction and a second state of being bent and arranged at an angle to the first direction; The pole lug unit is suitable for extending along the first direction to a side of the connecting piece away from the pole group module in the first state; and the pole lug unit is suitable for being welded to the connecting piece in the second state.

9. The battery according to claim 8, characterized in that The connecting piece includes a first connecting portion and a second connecting portion, the first connecting portion is suitable for being welded to the pole; the second connecting portion is formed by extending the first connecting portion along the third direction toward the direction close to the pole lug unit; the second connecting portion includes a first welding area and a second welding area, the first welding area and the second welding area are arranged opposite to each other along the second direction; The pole lug unit includes a first pole lug and a second pole lug, the first pole lug and the second pole lug are arranged opposite to each other along a second direction, the first pole lug is suitable for penetration welding with the first welding area in the second state, and the second pole lug is suitable for penetration welding with the second welding area in the second state.

10. The battery according to claim 8 or 9, characterized in that: The battery further comprises a housing module, wherein the housing module comprises a shell body and an explosion-proof valve; The shell body comprises a bottom wall and a side wall formed by the peripheral side edge of the bottom wall extending in a first direction away from the bottom wall, the side wall and the bottom wall together enclose a receiving cavity, and the receiving cavity is suitable for receiving the pole group module; The bottom wall and the cover body are arranged opposite to each other along a first direction, and an explosion-proof opening is formed on the bottom wall; the explosion-proof valve is welded to the bottom wall, and the explosion-proof valve is suitable for sealing the explosion-proof opening.

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