Cover plate assembly, battery monomer and battery pack

Abstract

The invention discloses a cover plate assembly, a battery monomer and a battery pack, and belongs to the technical field of batteries. The cover plate assembly comprises a first plate body which is provided with a first surface, a second surface and a first through hole penetrating through the first surface and the second surface, the pole comprises a pole bottom plate and a pole main body arranged on the pole bottom plate, the pole main body is arranged in the first through hole in a penetrating manner, and the pole bottom plate is attached to the second surface; the pole fixing block is arranged on the first surface, the pole fixing block is provided with a second through hole, and the pole body sequentially penetrates through the first through hole and the second through hole; the orthographic projection of the pole main body on the first surface has a first area S1, the orthographic projection of the pole fixing block on the first surface has a second area S2, and 0.15 < = S2 / S1 < = 1.44. Therefore, the pole main body is stably fixed and is directly welded with the busbar, the resistance between the pole main body and the busbar is reduced, the large overcurrent requirement is met, and the performance and the safety of the battery monomer are improved.

Description

Technical Field

[0001] The present application belongs to the field of battery technology, and specifically relates to a cover plate assembly, a battery cell and a battery pack. Background Art

[0002] The capacity of battery cells is increasing day by day, and battery cells with a capacity of more than 600Ah or even more than 1000Ah are the future design direction. Large capacity can directly reduce the cost per watt-hour of battery cells, but as the capacity increases, the welding between the existing pole fixing block and the busbar cannot meet the large overcurrent requirements, affecting the performance of the battery cells. Summary of the invention

[0003] Purpose of this application: This application provides a cover plate assembly to solve the problem that the riveting method of the battery cell and the bus bar does not meet the large-capacity overcurrent requirements, affecting the performance of the battery cell; this application also provides a battery cell; this application also provides a battery pack.

[0004] Technical solution: This application provides a cover plate assembly, including:

[0005] A first plate body having a first surface and a second surface which are oppositely arranged, and a first through hole which penetrates the first surface and the second surface;

[0006] A pole, comprising a pole bottom plate and a pole body arranged on the pole bottom plate, wherein the pole body is inserted into the first through hole, and the pole bottom plate is arranged close to the second surface;

[0007] A pole fixing block is arranged on the first surface, the pole fixing block has a second through hole, and the pole body is sequentially passed through the first through hole and the second through hole;

[0008] The orthographic projection of the pole body on the first surface has a first area S 1 The orthographic projection of the pole fixing block on the first surface has a second area S 2 , the cover plate assembly satisfies: 0.15≤S 2 / S 1 ≤1.44.

[0009] In some embodiments, the first surface and the second surface have a third area S 3 , the cover plate assembly satisfies: 0.5% ≤ S 1 / S 3 ≤29%.

[0010] In some embodiments, the orthographic projection of the pole body on the first surface is a rectangle, the orthographic projection of the pole fixing block on the first surface is either a rectangular ring or a polygonal ring, and the wall of the second through hole is the same as the orthographic projection of the pole body on the first surface.

[0011] In some embodiments, the cover plate assembly satisfies: 100mm 2 ≤S 1 ≤1600mm 2 .

[0012] In some embodiments, the cover plate assembly meets: 96mm 2 ≤S 2 ≤1100mm 2 .

[0013] In some embodiments, the orthographic projection of the pole body on the first surface is circular, the orthographic projection of the pole fixing block on the first surface is annular, and the hole wall of the second through hole is the same as the orthographic projection of the pole body on the first surface.

[0014] In some embodiments, the cover plate assembly meets: 63.6mm 2 ≤S 1 ≤2461.8mm 2 .

[0015] In some embodiments, the cover plate assembly meets: 75.4mm 2 ≤S 2 ≤364.2mm 2 .

[0016] In some embodiments, the outer peripheral surface of the pole body is welded to the inner wall of the second through hole, and the pole body is welded to the busbar.

[0017] In some embodiments, the cover plate assembly meets: 9342mm 2 ≤S 3 ≤24566mm 2 .

[0018] Accordingly, the present application also provides a battery cell, comprising:

[0019] A housing, wherein the housing has a receiving space and an opening communicating with the receiving space;

[0020] An inner core, disposed in the accommodation space;

[0021] As described in any one of the above embodiments, the cover plate assembly is sealed on the opening; the pole body in the cover plate assembly is used to connect with the bus bar.

[0022] Accordingly, the present application also provides a battery pack, comprising:

[0023] Busbar;

[0024] In a plurality of battery cells as described in the above embodiments, the busbar is connected to the pole body in the battery cells.

[0025] Beneficial effect: Compared with the prior art, the cover plate assembly provided in the embodiment of the present application comprises: a first plate body, having a first surface and a second surface arranged opposite to each other, and a first through hole penetrating the first surface and the second surface; a pole, comprising a pole bottom plate and a pole body arranged on the pole bottom plate, the pole body passing through the first through hole, and the pole bottom plate being arranged against the second surface; a pole fixing block, arranged on the first surface, the pole fixing block having a second through hole, and the pole body passing through the first through hole and the second through hole in sequence; the orthographic projection of the pole body on the first surface has a first area S 1 The positive projection of the pole fixing block on the first surface has a second area S 2 , the cover assembly meets: 0.15≤S 2 / S 1 ≤1.44. In this way, by sequentially passing the pole body through the first through hole and the second through hole, and setting the positive projection area ratio of the pole body and the pole fixing block, the pole body can be stably fixed and directly welded to the bus bar, thereby reducing the resistance between the pole body and the bus bar, better meeting the large overcurrent requirements, and improving the performance and safety of the battery cell.

[0026] It can be understood that, compared with the prior art, the battery cell provided in the embodiment of the present application includes all the technical features and technical effects of the above-mentioned cover plate assembly, which will not be repeated here.

[0027] It is understandable that, compared with the prior art, the battery pack provided in the embodiment of the present application includes all the technical features and technical effects of the above-mentioned battery cells, which will not be elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0029] Figure 1 A schematic diagram of the exploded structure of the cover plate assembly provided in an embodiment of the present application;

[0030] Figure 2A schematic diagram of the structure of a cover plate assembly provided in an embodiment of the present application;

[0031] Figure 3 for Figure 2 Schematic diagram of the cross section of AA;

[0032] Figure 4 Another structural schematic diagram of the cover plate assembly provided in an embodiment of the present application;

[0033] Figure 5 for Figure 4 Schematic cross-section of the middle BB;

[0034] Figure 6 A schematic diagram of another structure of the cover plate assembly provided in an embodiment of the present application;

[0035] Figure 7 A schematic diagram of another structure of the cover plate assembly provided in the embodiment of the present application;

[0036] Figure 8 A schematic diagram of the structure of a battery cell provided in an embodiment of the present application.

[0037] Figure markings: 100-cover plate assembly; 110-first plate body; 111-first surface; 112-second surface; 113-first through hole; 120-pole; 121-pole bottom plate; 122-pole body; 130-pole fixing block; 131-second through hole; 140-second plate body; 141-third through hole; 150-seal; 160-third plate body; 161-fourth through hole; 200-shell; 210-accommodating space; 220-opening; 300-inner core; 400-bus. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0039] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here can be implemented in an order other than those illustrated or described here. In the description of the present application, unless otherwise specified, "multiple" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist, for example, A and / or B, which can represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the associated objects before and after are an "or" relationship. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0040] Those skilled in the art will appreciate that the drawings are only schematic diagrams of example embodiments and may not be to scale. The modules or processes in the drawings are not necessarily required to implement the present application and therefore cannot be used to limit the scope of protection of the present application.

[0041] In battery cells, the poles and pole fixing blocks are usually riveted together, but the riveting expansion process will form rivet holes on the surface of the poles, making the surface of the poles uneven and unable to be used for welding. The busbar can only be welded to the pole fixing block. As the capacity of the battery cells increases, in order to adapt to the large overcurrent between the battery cells and the busbar, the size of the pole fixing block needs to be increased to increase the effective welding area between the busbar and the pole fixing block. However, due to the size of the battery cells, the pole fixing block cannot be increased to a size that can adapt to the large overcurrent.

[0042] In view of this, an embodiment of the present application provides a cover plate assembly 100, which solves the above-mentioned technical problems by successively passing the pole body 122 through the first through hole 113 and the second through hole 131, and setting the ratio of the positive projection area of ​​the pole body 122 and the pole fixing block 130, so that the pole body 122 can be stably fixed by the pole fixing block 130 and can be directly welded to the bus 400.

[0043] See also Figure 1 , Figure 2 and Figure 4 , Figure 1 A schematic diagram of the exploded structure of the cover plate assembly provided in an embodiment of the present application is illustrated; Figure 2 A structural schematic diagram of a cover plate assembly provided in an embodiment of the present application is illustrated; Figure 4Another structural schematic diagram of the cover plate assembly provided by the embodiment of the present application is illustrated. The embodiment of the present application provides a cover plate assembly 100, the cover plate assembly 100 includes: a first plate body 110, a pole 120 and a pole fixing block 130; wherein the first plate body 110 has a first surface 111 and a second surface 112 arranged opposite to each other and a first through hole 113 penetrating the first surface 111 and the second surface 112; the pole 120 includes a pole bottom plate 121 and a pole body 122 arranged on the pole bottom plate 121, the pole body 122 is passed through the first through hole 113, and the pole bottom plate 121 is arranged against the second surface 112; the pole fixing block 130 is arranged on the first surface 111, the pole fixing block 130 has a second through hole 131, and the pole body 122 is passed through the first through hole 113 and the second through hole 131 in sequence; the orthographic projection of the pole body 122 on the first surface 111 has a first area S 1 The orthographic projection of the pole fixing block 130 on the first surface 111 has a second area S 2 , the cover plate assembly 100 satisfies: 0.15≤S 2 / S 1 ≤1.44. Specifically, in the embodiment of the present application, the pole body 122 is sequentially inserted into the first through hole 113 and the second through hole 131, and the orthographic projection area ratio of the pole body 122 and the pole fixing block 130 is set, so that the pole body 122 is stably fixed by the pole fixing block 130 and can be directly welded to the bus bar 400, thereby reducing the resistance between the pole body 122 and the bus bar 400, better meeting the large overcurrent requirements, and improving the performance and safety of the battery cell.

[0044] Specifically, S 2 / S 1 It can be any value among 0.15, 0.16, 0.17, 0.18, 0.19, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.3, 1.4, 1.41, 1.42, 1.43, 1.44, or a range between any two values. In the range of 0.15 to 1.44, when S 2 / S 1 The smaller the S is, the larger the area of ​​the pole body 122 is, and the larger the weldable area between the pole body 122 and the busbar 400 is. 2 / S 1 The larger the value, the larger the area of ​​the pole fixing block 130 , and the larger the fixing area of ​​the pole fixing block 130 to the pole body 122 ; within the above range, the current capacity can be guaranteed, and the corresponding battery cell can have a better charging and discharging efficiency.

[0045] Please refer again Figure 1In some embodiments, the cover plate assembly 100 further includes a second plate 140, a seal 150 and a third plate 160. The second plate 140 is an inner insulating member, disposed between the first plate 110 and the pole bottom plate 121, and the second plate 140 has a third through hole 141; the seal 150 is an annular structure, disposed between the second plate 140 and the pole bottom plate 121, and disposed around the pole body 122; the third plate 160 is an outer insulating member, disposed between the first plate 110 and the pole fixing block 130, and the third plate 160 has a fourth through hole; the pole body 122 is sequentially penetrated through the third through hole 141, the first through hole 113, the fourth through hole 161 and the second through hole 131. Among them, the second plate 140 is set as an inner insulating member, and the third plate 160 is set as an outer insulating member to form a multi-layer insulation structure to ensure the safety and reliability of the battery cell. Secondly, the seal 150 can effectively prevent the electrolyte from leaking inside the battery cell, ensuring the normal operation of the battery cell while preventing the electrolyte from leaking and causing corrosion and other damage to other parts of the battery cell and the external environment. In this way, the pole body 122 is sequentially penetrated through the third through hole 141, the first through hole 113, the fourth through hole 161 and the second through hole 131 to form a stable cover assembly. When the battery cell is subjected to external mechanical stress such as vibration and impact, the stable cover assembly can prevent the pole body 122 from displacement or damage, thereby ensuring the normal operation of the battery cell.

[0046] In some embodiments, the first surface 111 and the second surface 112 have a third area S 3 , the cover plate assembly 100 satisfies: 0.5% ≤ S 1 / S 3 ≤29%. Specifically, S 1 / S 3 It can be any value among 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 5%, 10%, 15%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, or a range between any two values. In the range of 0.5% to 29%, when S 1 / S 3 The smaller the S is, the smaller the area of ​​the pole body 122 is, and the smaller the weldable area between the pole body 122 and the busbar 400 is. 1 / S 3 The larger the value, the larger the area of ​​the pole body 122 , and the larger the weldable area between the pole body 122 and the busbar 400 ; within the above range, the current capacity can be guaranteed, and the corresponding battery cell can have a better charge and discharge efficiency.

[0047] Please also read Figure 2 and Figure 3 , Figure 3 Indicated Figure 2 AA is a cross-sectional schematic diagram. In some embodiments, the orthographic projection of the pole body 122 on the first surface 111 is a rectangle, the orthographic projection of the pole fixing block 130 on the first surface 111 is any one of a rectangular ring or a polygonal ring, and the hole wall of the second through hole 131 is the same as the orthographic projection of the pole body 122 on the first surface 111. Specifically, when the orthographic projection of the pole body 122 on the first surface 111 is a rectangle, the pole body 122 can be fixed in a corresponding position more stably during installation and use. Secondly, the orthographic projection of the pole fixing block 130 on the first surface 111 is a rectangular ring or a polygonal ring, which also helps to enhance the stability of the overall structure. The shape of the polygonal ring can be designed according to the specific installation environment and mechanical requirements. For example, a hexagonal ring-shaped pole fixing block 130 can be used, which can contact with the surrounding structure through multiple edges, disperse pressure, and provide a more stable fixing effect. The hole wall of the second through hole 131 and the positive projection of the pole body 122 on the first surface 111 are the same, so that the pole body 122 can be tightly installed in the second through hole 131, which can effectively reduce the shaking of the pole body 122, thereby avoiding problems such as poor line contact caused by shaking, and ensuring the stability of the internal circuit connection of the battery.

[0048] In some embodiments, when the orthographic projection of the pole body 122 on the first surface 111 is a rectangle, the orthographic projection of the pole fixing block 130 on the first surface 111 is any one of a rectangular ring or a polygonal ring, and the hole wall of the second through hole 131 and the orthographic projection of the pole body 122 on the first surface 111 are the same, the cover assembly 100 satisfies: 100mm 2 ≤S 1 ≤1600mm 2 . Specifically, S 1 Can be 100mm 2 , 200mm 2 、300mm 2 , 400mm 2 , 500mm 2 、600mm 2 、700mm 2 , 800mm 2 , 900mm 2 , 1000mm 2 、1100mm 2 、1200mm 2 、1300mm 2 、1400mm 2 、1500mm 2 、1600mm 2Any value in or a range between any two values. 1 The larger the size, the larger the area of ​​the pole body 122. 1 The smaller the value, the smaller the area of ​​the pole body 122. Within the above range, the current capacity of the cap plate assembly 100 can be guaranteed, and the corresponding battery cell can have a better charging and discharging efficiency.

[0049] In some embodiments, when the orthographic projection of the pole body 122 on the first surface 111 is a rectangle, the orthographic projection of the pole fixing block 130 on the first surface 111 is any one of a rectangular ring or a polygonal ring, and the hole wall of the second through hole 131 and the orthographic projection of the pole body 122 on the first surface 111 are the same, the cover assembly 100 meets: 96mm 2 ≤S 2 ≤1100mm 2 . Specifically, S 2 Can be 96mm 2 , 100mm 2 , 200mm 2 、300mm 2 , 400mm 2 , 500mm 2 、600mm 2 、700mm 2 , 800mm 2 , 900mm 2 , 1000mm 2 、1100mm 2 Any value in or a range between any two values. 2 The larger the size, the larger the area of ​​the pole fixing block 130. 2 The smaller the value, the smaller the area of ​​the pole fixing block 130. Within the above range, the current capacity of the cap plate assembly 100 can be guaranteed, and the corresponding battery cell can have a better charging and discharging efficiency.

[0050] Please also read Figure 4 and Figure 5 , Figure 5 Indicated Figure 4Schematic cross-sectional view of BB in FIG. In some embodiments, in some embodiments, the orthographic projection of the pole body 122 on the first surface 111 is a circle, the orthographic projection of the pole fixing block 130 on the first surface 111 is a ring, and the hole wall of the second through hole 131 is the same as the orthographic projection of the pole body 122 on the first surface 111. Specifically, when the orthographic projection of the pole body 122 on the first surface 111 is a circle, and the orthographic projection of the pole fixing block 130 on the first surface 111 is a ring, since the circular and ring-shaped structures have uniform force characteristics, when the battery cell is subjected to external pressure, vibration, etc., the circular pole body 122 can evenly disperse the pressure to the hole wall of the second through hole 131 of the pole fixing block 130. In addition, since the hole wall of the second through hole 131 and the positive projection of the pole body 122 on the first surface 111 are the same, the pole body 122 can fit tightly in the second through hole 131, so that the pole is fixed more firmly inside the battery cell, thereby improving the structural stability of the entire cover assembly 100.

[0051] In some embodiments, when the orthographic projection of the pole body 122 on the first surface 111 is circular, the orthographic projection of the pole fixing block 130 on the first surface 111 is annular, and the hole wall of the second through hole 131 and the orthographic projection of the pole body 122 on the first surface 111 are the same, the cover assembly 100 satisfies: 63.6mm 2 ≤S 1 ≤2461.8mm 2 . Specifically, S 1 Can be 63.6mm 2 , 70mm 2 , 80mm 2 、90mm 2 , 100mm 2 , 200mm 2 、300mm 2 , 400mm 2 , 500mm 2 、600mm 2 、700mm 2 , 800mm 2 , 900mm 2 , 1000mm 2 、1100mm 2 、1200mm 2 、1300mm 2 、1400mm 2 、1500mm 2 、1600mm 2 、1700mm 2 、1800mm 2 、1900mm2 , 2000mm 2 、2100mm 2 、2200mm 2 、2300mm 2 、2400mm 2 、2461.8mm 2 Any value in or a range between any two values. 1 The larger the size, the larger the area of ​​the pole body 122. 1 The smaller the value, the smaller the area of ​​the pole body 122. Within the above range, the current capacity of the cap plate assembly 100 can be guaranteed, and the corresponding battery cell can have a better charging and discharging efficiency.

[0052] In some embodiments, when the orthographic projection of the pole body 122 on the first surface 111 is circular, the orthographic projection of the pole fixing block 130 on the first surface 111 is annular, and the hole wall of the second through hole 131 and the orthographic projection of the pole body 122 on the first surface 111 are the same, the cover assembly 100 meets: 75.4mm 2 ≤S 2 ≤364.2mm 2 . Specifically, S 2 Can be 96mm 2 , 100mm 2 , 200mm 2 、300mm 2 、310mm 2 、320mm 2 、330mm 2 、340mm 2 、350mm 2 、360mm 2 、361mm 2 、362mm 2 、363mm 2 、364mm 2 、364.1mm 2 、364.2mm 2 Any value in or a range between any two values. 2 The larger the size, the larger the area of ​​the pole fixing block 130. 2 The smaller the value, the smaller the area of ​​the pole fixing block 130. Within the above range, the current capacity of the cap plate assembly 100 can be guaranteed, and the corresponding battery cell can have a better charging and discharging efficiency.

[0053] In some embodiments, see Figure 6 , Figure 6Another structural schematic diagram of the cover assembly provided by the embodiment of the present application is illustrated. The orthographic projection of the pole body 122 on the first surface 111 is a circle, and the orthographic projection of the pole fixing block 130 on the first surface 111 is any one of a rectangular ring or a polygonal ring, and the hole wall of the second through hole 131 is the same as the orthographic projection of the pole body 122 on the first surface 111. Specifically, the orthographic projection of the pole body 122 is a circle, so that the pole body 122 can be evenly dispersed in all directions to reduce stress concentration. The pole fixing block 130 adopts a rectangular ring or a polygonal ring. It can be understood that the side of the pole fixing block 130 close to the pole body 122 is the same shape as the pole body 122, and the orthographic projection of the pole fixing block 130 on the first surface 111 away from the edge of the pole body 122 is a rectangle or a polygon, so that it can be complementary to the circular pole body 122 in shape, providing stable support and fixation, which is conducive to enhancing the structural stability of the entire cover assembly 100.

[0054] In some embodiments, see Figure 7 , Figure 7 Another structural schematic diagram of the cover assembly provided by an embodiment of the present application is illustrated. The orthographic projection of the pole body 122 on the first surface 111 is a rectangle, the orthographic projection of the pole fixing block 130 on the first surface 111 is a circular ring, and the hole wall of the second through hole 131 is the same as the orthographic projection of the pole body 122 on the first surface 111. Specifically, the orthographic projection of the pole body 122 is a rectangle to better adapt to some special layout and design requirements, and can more effectively utilize space and improve the space utilization of the entire cover assembly 100. At this time, the pole fixing block 130 is a circular ring. It can be understood that the side of the pole fixing block 130 close to the pole body 122 is the same shape as the pole body 122, and the orthographic projection of the pole fixing block 130 on the first surface 111 is circular away from the edge of the pole body 122. In this way, for the rectangular pole body 122, the circular ring-shaped fixing block 130 can form a uniform pressure distribution around the pole body 122, which helps to better achieve the fixing effect. At the same time, the annular pole fixing block 130 can provide all-round support when fixing the pole body 122 , so that the forces on the pole body 122 in different directions are more balanced, thereby enhancing the reliability of fixing the pole body 122 .

[0055] In some embodiments, the outer peripheral surface of the pole body 122 is welded to the inner wall of the second through hole 131, and the pole body 122 is welded to the bus 400. Specifically, the outer peripheral surface of the pole body 122 is welded to the inner wall of the second through hole 131 to form a very stable mechanical connection, thereby ensuring a reliable electrical connection between the pole body 122 and the pole fixing block 130. During the operation of the battery cell, the current can stably pass through the welding part, and intermittent power failure or poor contact will not occur due to loose connection. In addition. The welding connection can achieve a low-resistance connection between the pole body 122 and the bus 400, so that the current can be efficiently collected and distributed. When multiple battery cells are connected in series or in parallel to form a battery pack, the stable welding connection between the pole body 122 and the bus 400 can ensure that the electric energy of each battery cell can accurately participate in the charging and discharging process of the entire battery pack, and adapt to the situation of large overcurrent, thereby improving the overall charging and discharging efficiency of the battery pack.

[0056] In some embodiments, the cover assembly 100 meets: 9342mm 2 ≤S 3 ≤24566mm 2 . Specifically, S 3 Can be 9342mm 2 , 10000mm 2 、11000mm 2 、12000mm 2 、13000mm 2 、14000mm 2 、15000mm 2 、16000mm 2 、17000mm 2 、18000mm 2 、19000mm 2 , 20000mm 2 、21000mm 2 、22000mm 2 、23000mm 2 、24000mm 2 、24566mm 2 Any value in or a range between any two values. 3 The larger the size, the larger the area of ​​the first surface 111 and the second surface 112. 3 The smaller the value, the smaller the area of ​​the first surface 111 and the second surface 112. Within the above range, the current capacity of the cap plate assembly 100 can be guaranteed, and the corresponding battery cells can have better charging and discharging efficiency.

[0057] In summary, the cover plate assembly 100 provided in the embodiment of the present application sequentially inserts the pole body 122 into the first through hole 113 and the second through hole 131, and sets the ratio of the orthographic projection area of ​​the pole body 122 and the pole fixing block 130, so that the pole body 122 is stably fixed by the pole fixing block 130 and can be directly welded to the bus 400, thereby reducing the resistance between the pole body 122 and the bus 400, better meeting the large overcurrent requirements, and improving the performance and safety of the battery cell. In addition, the embodiment of the present application can also increase the size of the pole body 122 within the limited size of the first plate body 110, thereby increasing the welding area between the pole body 122 and the bus 400. Even if the overcurrent requirement of the cover plate assembly 100 increases, the pole body 122 can be prevented from overheating due to overcurrent, and the contact area between the pole body 122 and the pole fixing block 130 can be further prevented from being too hot, thereby improving the performance of the battery cell. Accordingly, please refer to Figure 8 , Figure 8 The schematic diagram of the structure of the battery cell provided by the embodiment of the present application is illustrated. The embodiment of the present application also provides a battery cell, comprising a shell 200, an inner core 300 and a cover plate assembly 100 as in any one of the above embodiments; wherein the shell 200 has a receiving space 210 and an opening 220 connected to the receiving space 210; the inner core 300 is disposed in the receiving space 210; the cover plate assembly 100 covers the opening 220; and the pole body 122 in the cover plate assembly 100 is used to connect with the busbar 400.

[0058] It can be understood that, compared with the prior art, the battery cell provided in the embodiment of the present application includes all the technical features and technical effects of the above-mentioned cover plate assembly, which will not be repeated here.

[0059] Correspondingly, the embodiment of the present application also provides a battery pack, including a bus 400 and a plurality of battery cells as described above, and the bus 400 is connected to the pole body 122 in the battery cell. The battery pack is used to store and release electrical energy, and may also include a housing and a plurality of the battery cells described above, wherein the plurality of battery cells are accommodated in the housing. Among them, the battery pack may be a battery module, a battery pack, a battery cluster, a battery stack, a battery tower, a battery array, or the like, which is a charging and discharging structure composed of a plurality of battery cells. Battery cells include, but are not limited to, lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., which are not limited to the embodiments of the present disclosure.

[0060] It is understandable that, compared with the prior art, the battery pack provided in the embodiment of the present application includes all the technical features and technical effects of the above-mentioned battery cells, which will not be elaborated here.

[0061] Accordingly, the present application also provides an electric device, including the battery pack of the above embodiment. The electric device can be various types of equipment such as new energy vehicles, computers, energy storage power supply devices, etc.

[0062] It can be understood that, compared with the prior art, the embodiment of the present application provides an electrical device, including all the technical features and technical effects of the above-mentioned battery pack, which will not be repeated here.

[0063] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0064] The above is a detailed introduction to a cover plate assembly, a battery cell and a battery pack provided in the embodiments of the present application, and specific examples are used to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the technical solution and its core idea of ​​the present application; ordinary technicians in this field should understand that: they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the present application.

Claims

1. A cover plate assembly, characterized in that: The cover plate assembly (100) comprises: A first plate body (110) having a first surface (111), a second surface (112) arranged opposite to each other, and a first through hole (113) penetrating the first surface (111) and the second surface (112); A pole (120), comprising a pole bottom plate (121) and a pole body (122) arranged on the pole bottom plate (121), the pole body (122) passing through the first through hole (113), and the pole bottom plate (121) being arranged close to the second surface (112); A pole fixing block (130) is arranged on the first surface (111), the pole fixing block (130) has a second through hole (131), and the pole body (122) is sequentially passed through the first through hole (113) and the second through hole (131); The orthographic projection of the pole body (122) on the first surface (111) has a first area S1, the orthographic projection of the pole fixing block (130) on the first surface (111) has a second area S2, and the cover plate assembly (100) satisfies: 0.15≤S2 / S1≤1.

44.

2. The cover plate assembly according to claim 1, characterized in that: The first surface (111) and the second surface (112) have a third area S3, and the cover plate assembly (100) satisfies: 0.5%≤S1 / S3≤29%.

3. The cover plate assembly according to claim 2, characterized in that: The orthographic projection of the pole body (122) on the first surface (111) is a rectangle, the orthographic projection of the pole fixing block (130) on the first surface (111) is any one of a rectangular ring or a polygonal ring, and the hole wall of the second through hole (131) is the same as the orthographic projection of the pole body (122) on the first surface (111).

4. The cover plate assembly according to claim 3, characterized in that: The cover plate assembly (100) meets the following requirements: 100 mm 2 ≤S1≤1600mm 2 .

5. The cover plate assembly according to claim 3, characterized in that: The cover plate assembly (100) meets the following requirements: 96 mm 2 ≤S2≤1100mm 2 .

6. The cover plate assembly according to claim 2, characterized in that: The orthographic projection of the pole body (122) on the first surface (111) is circular, the orthographic projection of the pole fixing block (130) on the first surface (111) is annular, and the hole wall of the second through hole (131) is the same as the orthographic projection of the pole body (122) on the first surface (111).

7. The cover plate assembly according to claim 6, characterized in that: The cover plate assembly (100) meets the following requirements: 63.6 mm 2 ≤S1≤2461.8mm 2 .

8. The cover plate assembly according to claim 6, characterized in that: The cover plate assembly (100) meets the following requirements: 75.4 mm 2 ≤S2≤364.2mm 2 .

9. The cover plate assembly according to claim 1, characterized in that: The outer peripheral surface of the pole body (122) is welded to the inner wall of the second through hole (131), and the pole body (122) is welded to the busbar (400).

10. The cover plate assembly according to claim 2, characterized in that: The cover plate assembly (100) meets the following requirements: 9342 mm 2 ≤S3≤24566mm 2 .

11. A battery cell, characterized in that: include: A housing (200), the housing (200) having a receiving space (210) and an opening (220) communicating with the receiving space (210); An inner core (300) is disposed in the accommodation space (210); The cover plate assembly (100) according to any one of claims 1 to 10, wherein the cover plate assembly (100) is sealed on the opening (220); and the pole body (122) in the cover plate assembly (100) is used to be connected to a busbar (400).

12. A battery pack, characterized in that: include: Busbar (400); A plurality of battery cells as claimed in claim 11, wherein the busbar (400) is connected to the terminal body (122) in the battery cells.

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