Battery cell cover plate assembly, battery cell and battery pack

Abstract

The invention relates to the technical field of batteries, and discloses a battery cell cover plate assembly, a battery cell and a battery pack. The battery cell cover plate assembly comprises a cover plate, a riveting block and a pole. The cover plate is provided with an assembly hole; the riveting block is provided with a pole mounting hole, the riveting block is of a rectangular structure, and the pole mounting hole is a stepped hole and comprises an assembly hole section and a riveting hole section; the pole is riveted with the riveting block, the riveted pole comprises an assembly column section matched with the assembly hole section and a riveting column section matched with the riveting hole section, and a concave riveting groove is formed in the top of the riveting column section; the sizes of the riveting block and the pole meet preset conditions. It can be guaranteed that the two ends of the riveting block do not warp or deform in the thickness direction of the riveting block, the flatness of the riveting block is guaranteed, meanwhile, the riveting block does not expand or deform in the length direction of the riveting block, and therefore the size precision of the total height of a battery cell and the welding quality between the battery cell and a busbar are guaranteed, and the welding positioning precision between the battery cell and the busbar is guaranteed; and the reliability and the safety of the battery are ensured.

Description

Technical Field

[0001] The present invention relates to the field of battery technology, and in particular to a battery cover assembly, a battery cell and a battery pack. Background Art

[0002] With the rapid development of new energy technologies, blade batteries, as high-energy-density, long-life energy storage devices, are gradually becoming one of the core technologies in the electric vehicle and energy storage fields. The blade battery cover assembly, as a key component, performs multiple functions such as sealing, electrical connection, and mechanical support. Currently, the mainstream blade battery cover assembly on the market typically consists of a cover, a rivet block, and a terminal. The rivet block is used to secure the terminal and achieve a mechanical connection with the cover.

[0003] Existing battery cells use a narrow, rectangular cover. To meet current requirements, the rivet block is also designed as a narrow, rectangular structure, and is connected to the terminal through riveting. During riveting, vertical pressure is applied from top to bottom, centering on the terminal, to ensure a tight fit between the rivet block and the terminal.

[0004] Because the area of ​​the rivet block near the center of the pole is subject to greater force, the riveting effect is better. However, the area farther from the center is prone to warping due to uneven force. In other words, the ends of the narrow, rectangular rivet block are prone to warping and deformation after riveting, affecting the overall flatness and smoothness of the cover assembly. Furthermore, dimensional deviations caused by assembly can cause quality problems such as cold welds in the welding of the rivet block to the busbar, reducing the reliability and consistency of the battery and failing to fully meet the requirements of high-performance power batteries. Summary of the Invention

[0005] In view of this, the present invention provides a battery cover assembly, a battery cell and a battery pack to solve the problem of deterioration of the flatness of the rivet block after the rivet block and the pole are riveted.

[0006] In a first aspect, the present invention provides a battery cell cover plate assembly, comprising a cover plate, a rivet block, and a pole. The cover plate is provided with an assembly hole; the rivet block is provided with a pole mounting hole, the rivet block is a rectangular structure, and the pole mounting hole is a stepped hole, including an assembly hole section and a rivet hole section; the pole is riveted to the rivet block, and the riveted pole includes an assembly column section that cooperates with the assembly hole section and a rivet column section that cooperates with the rivet hole section, with a concave rivet groove formed on the top of the rivet column section; the dimensions of the rivet block and the pole meet the following requirements:

[0007]

[0008] in,

[0009] L is the total length of the riveted column along the X direction, in mm.

[0010] W is the total width of the riveted column along the Y direction, in mm.

[0011] L0 is the length of the riveting block along the X direction, in mm.

[0012] W0 is the width of the riveting block along the Y direction, in mm.

[0013] Beneficial effects: The present invention satisfies the following requirements by limiting the dimensional relationship between the riveting block and the pole: Ensure a good fit between the rivet block and the pole, so that after riveting, the two ends of the rivet block will not be warped or deformed along the thickness direction, and will not be deformed outward along the length direction. This can ensure the flatness of the rivet block, thereby ensuring the dimensional accuracy of the total height of the battery cell and the welding quality between the battery cell and the bus bar, and can also ensure that it will not be over-expanded and deformed, thereby ensuring the welding positioning accuracy between the battery cell and the bus bar, and ensuring the reliability and safety of the battery.

[0014] In an optional embodiment, the following conditions are also met:

[0015]

[0016] 5mm≤L≤25mm,

[0017] 20mm≤L0≤80mm.

[0018] In an optional embodiment, the following conditions are also met:

[0019]

[0020] 3.5mm≤W≤15mm,

[0021] 6mm≤W0≤20mm.

[0022] In an optional embodiment, the following conditions are also met:

[0023]

[0024] 7mm≤L1≤45mm,

[0025] Wherein, L1 is the distance from the center of the pole to either end of the riveted block along the X direction, in mm;

[0026] The pole mounting hole is a track-shaped hole or a circular hole.

[0027] In an optional embodiment, the following conditions are also met:

[0028]

[0029] In an optional embodiment, the following conditions are also met:

[0030]

[0031] In an optional embodiment, the pole further includes a pole base plate, the assembly column section of the pole is connected to the pole base plate, the pole base plate and the rivet block are respectively arranged on both sides of the cover plate, and the pole passes through the assembly hole and the pole mounting hole in sequence and is riveted to the rivet block.

[0032] In an optional embodiment, a first insulating member and a second insulating member are further included, wherein the first surface of the cover plate and the riveted block are insulated and connected via the first insulating member, and the second surface of the cover plate and the pole are insulated and connected via the second insulating member.

[0033] In the second aspect, the present invention also provides a battery cell, comprising a shell, a pole group and the battery cell cover assembly in the above technical solution, the shell having a accommodating cavity and an opening connected to the accommodating cavity; the pole group is arranged in the accommodating cavity of the shell; the battery cell cover assembly is arranged in the opening of the shell to encapsulate the pole group in the shell.

[0034] Beneficial Effects: The cell cover assembly is applied to the battery cell to seal the opening of the cell housing, sealing and protecting the internal components of the battery, preventing chemical leakage and the impact of the external environment on the battery. The poles of the cell cover assembly provide a path for the flow of current in and out, ensuring the current conduction during the battery cell's charging and discharging process. The cell cover assembly not only serves as an electrical connection for the battery cell, but also enhances the overall structural stability of the battery cell. It is an important component of the battery cell, ensuring the durability and safety of the battery cell during use.

[0035] Because the battery cell includes a battery cell cover plate assembly and has all the technical effects of the battery cell cover plate assembly, it will not be repeated here.

[0036] In a third aspect, the present invention further provides a battery pack comprising a plurality of battery cells according to the above technical solution, wherein the riveted blocks of adjacent battery cells are welded via a busbar.

[0037] Beneficial effects: Since the battery pack includes battery cells, it has all the technical effects of battery cells and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0039] Figure 1 This is a top view of the battery cover assembly after assembly in the prior art;

[0040] Figure 2 for Figure 1 A partial enlarged view of point E in the middle;

[0041] Figure 3 For the Figure 1 Cross-sectional view at FF;

[0042] Figure 4 for Figure 3 A partial enlarged view of point D in the middle;

[0043] Figure 5 An exploded view of a battery cell cover assembly according to an embodiment of the present invention;

[0044] Figure 6 for Figure 1 The front view of the cell cover assembly after assembly is shown;

[0045] Figure 7 for Figure 1 A top view of the cell cover assembly after assembly is shown;

[0046] Figure 8 For the Figure 7 Cross-sectional view at AA in the middle;

[0047] Figure 9 for Figure 8 A partial enlarged view of point B in the middle;

[0048] Figure 10 for Figure 8 Cross-sectional view of the middle riveting block;

[0049] Figure 11 for Figure 8 Cross-sectional view of the center pole;

[0050] Figure 12 A schematic diagram of flatness measurement points.

[0051] Description of reference numerals:

[0052] 1. Cover plate; 101. Assembly hole; 2. Riveted block; 201. Pole mounting hole; 2011. Assembly hole section; 2012. Riveted hole section; 3. Pole; 301. Assembly column section; 302. Riveted column section; 303. Riveted groove; 304. Pole base plate; 305. Pole body; 4. First insulating member; 5. Second insulating member; 6. Sealing ring; 7. Explosion-proof valve; 8. Explosion-proof valve patch. DETAILED DESCRIPTION

[0053] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0054] In the prior art, the riveting block and the pole are riveted together. During this process, vertical pressure is applied from top to bottom with the pole as the center, such as Figure 3 As shown in the Z direction in the figure, the rivet block fits tightly with the pole. Since the area of ​​the rivet block close to the center of the pole is subjected to greater force, the riveting effect is better, while the area far from the center of the pole is prone to warping due to uneven force, as shown in the figure. Figure 3 and Figure 4 As shown in the figure, the area shown in C is the riveting force application area, and the area shown in D is the area that is prone to warping and deformation. Especially for the narrow and long rectangular riveted blocks (the length of the riveted blocks is significantly greater than the width of the riveted blocks), the warping and deformation at both ends after riveting are more obvious. In addition, for the existing battery cover assembly, the two short sides of the riveted blocks will also cause excessive expansion and deformation due to the riveting force, such as Figure 1 and Figure 2 As shown, this affects the visual positioning of the battery cells and busbars during welding, resulting in weld deviation and welding quality problems, affecting the reliability and safety of the battery.

[0055] In view of the above technical problems, the present invention provides a battery cover assembly, a battery cell and a battery pack. Figures 5 to 12 , describing embodiments of the present invention.

[0056] According to an embodiment of the present invention, in a first aspect, a cell cover plate assembly is provided, comprising a cover plate 1, a rivet block 2, and a pole 3. The cover plate 1 is provided with an assembly hole 101; the rivet block 2 is provided with a pole mounting hole 201, the rivet block 2 being a rectangular structure, and the pole mounting hole 201 being a stepped hole, comprising an assembly hole section 2011 and a rivet hole section 2012; the pole 3 is riveted to the rivet block 2, and the riveted pole 3 comprises an assembly column section 301 that cooperates with the assembly hole section 2011 and a rivet column section 302 that cooperates with the rivet hole section 2012, with a concave rivet groove 303 formed at the top of the rivet column section 302; the dimensions of the rivet block 2 and the pole 3 satisfy the following requirements:

[0057]

[0058] in,

[0059] L is the total length of the riveted column section 302 along the X direction, in mm.

[0060] W is the total width of the riveted column section 302 along the Y direction, in mm.

[0061] L0 is the length of the riveting block 2 along the X direction, in mm.

[0062] W0 is the width of the riveting block 2 along the Y direction, in mm.

[0063] Specifically, the X and Y directions are shown in Figure 7 shown. Figure 7 The X direction shown in the figure can be understood as the length direction of the riveting block 2, which is also the length direction of the cover plate 1. Figure 7 The Y direction shown in FIG can be understood as the width direction of the riveting block 2 , which is also the width direction of the cover plate 1 .

[0064] For the narrow and long rectangular riveted block 2, if If the value is too large, the two short sides of the riveting block 2 along the X direction are prone to excessive expansion, resulting in outward deformation, such as Figure 2 As shown in the shaded part, the visual positioning between the battery cell and the busbar is affected, resulting in weld deviation; if If the value is too small, the two ends of the riveted block 2 are prone to warping along the X direction, such as Figure 3 and Figure 4 As shown, the flatness is deteriorated, which does not meet the flatness requirements of the battery cell for the riveted block.

[0065] The present invention defines the dimensional relationship between the riveting block 2 and the pole 3 so that the two satisfy the following requirements: This ensures a good fit between the rivet block 2 and the terminal 3, so that after riveting, the ends of the rivet block 2 do not warp or deform along their thickness, nor do they expand or deform along their length. This ensures the flatness of the rivet block 2, thereby ensuring the dimensional accuracy of the cell height and the weld quality between the cell and the busbar. It also prevents the rivet block 2 from excessive expansion or deformation, thereby ensuring the weld positioning accuracy between the cell and the busbar, and ensuring the reliability and safety of the battery.

[0066] Flatness, as a geometric tolerance indicator, is used to assess the degree of deviation between an actual surface and an ideal plane. Simply put, it describes the flatness of a surface. A smaller flatness value indicates that the surface is closer to an ideal plane, meaning it is flatter. The embodiments provided by the present invention can ensure that the flatness of the riveted block 2 after riveting is less than or equal to 0.25 mm, meeting the flatness requirements of the battery cell for the riveted block 2.

[0067] In this embodiment, the pole 3 assembled with the rectangular riveted block 2 can be a circular pole or an elliptical pole. Specifically, a circular pole means that the riveted column section 302 of the pole 3 is a cylindrical structure, and the pole mounting hole 201 on the riveted block 2 adapted thereto is a circular hole. An elliptical pole means that the cross-sectional shape of the riveted column section 302 of the pole 3 along its XY plane is a track-and-field runway-shaped structure, including two arc edges and two straight edges, and the pole mounting hole 201 on the riveted block 2 adapted thereto is a track-and-field runway-shaped hole. When an elliptical pole is used, the straight edges of the riveted column section 302 of the pole 3 are arranged along the X direction, that is, the length direction of the riveted column section 302 of the pole 3 is arranged in the same direction as the length direction of the riveted block 2.

[0068] In order to verify the technical solution and technical effects of the present invention, specific embodiments and comparative examples are provided below, and the flatness of each case is measured, as well as the quality inspection of the four sides of the riveting block 2.

[0069] Specifically, the flatness of the riveted block 2 after riveting is ≤0.25mm, which is acceptable. The flatness measurement method can adopt the test method known to those skilled in the art. As an example, after riveting, the present invention selects 8-12 points on the entire riveted block 2 plane within a range of 5mm inward from each edge of the riveted block 2, measures the height of each point, and calculates the maximum height difference from the highest point to the lowest point, which is the flatness. The measurement point diagram is shown in FIG. Figure 12 , where the shaded area indicated by G is the selected area of ​​the measurement points, and the points indicated by M are the measurement points, totaling 12.

[0070] The quality inspection of the four sides of the riveting block 2 is specifically to inspect whether the four sides of the riveting block 2 are deformed outward.

[0071] The following is an actual example of flatness measurement and four-edge quality inspection of an elliptical pole after riveting it to riveting block 2. The results are detailed in Table 1.

[0072] Table 1

[0073]

[0074] As can be seen from Table 1, in Examples 1 to 5, The value is between 0.2 and 0.65, and the measured results are good. The flatness of the riveted block 2 is lower than 0.25, which meets the requirements, and there is no outward expansion deformation or other problems on the four sides.

[0075] In Comparative Examples 1 to 4, The values ​​are too small, all below 0.2. The riveted block 2 has warping at both ends, and the flatness is significantly greater than 0.25, which does not meet the requirements.

[0076] In Comparative Examples 5 and 8, The value is too large, higher than 0.65. Although the flatness is qualified, the two short sides of the riveting block 2 are deformed outward, which affects the visual positioning of the busbar welding and causes the weld mark to deviate.

[0077] Therefore, the dimensional relationship between the riveting block 2 and the pole 3 satisfies: The flatness of the riveted block 2 can be ensured, thereby ensuring the overall dimensional accuracy of the battery cell and the welding quality between the battery cell and the busbar. It can also ensure that the riveted block 2 will not over-swell or deform outward, thereby ensuring the welding positioning accuracy between the battery cell and the busbar and ensuring the reliability and safety of the battery.

[0078] Further optimized embodiments are provided below.

[0079] In some embodiments, the following conditions are also met:

[0080]

[0081] 5mm≤L≤25mm,

[0082] 20mm≤L0≤80mm,

[0083] The pole mounting hole 201 is a track-shaped hole.

[0084] In this embodiment, the pole mounting hole 201 is track-shaped, and the pole 3 that fits it is elliptical. The dimensions of the elliptical pole and the rivet block 2 are further optimized and limited, with the ratio of the total length L of the rivet segment 302 in the X direction to the length L0 of the rivet block 2 in the X direction being controlled within a range of 8% to 30%. If this ratio is too small, below 8%, the flatness of the rivet block 2 will be degraded. If it is too large, above 30%, the welding area between the rivet block 2 and the busbar will be reduced, affecting the current flow capacity.

[0085] Therefore, By controlling the flatness within the range of 8% to 30%, the flatness of the riveted block 2 after riveting can be further optimized, while ensuring that there is sufficient welding area between the riveted block 2 and the busbar, thereby ensuring the flow capacity.

[0086] Specifically, the total length L of the riveted column section 302 along the X direction is in the range of 5 mm to 25 mm, including 5 mm, 8 mm, 10 mm, 12 mm, 15 mm, 18 mm, 20 mm, 23 mm, and 25 mm.

[0087] The length L0 of the riveting block 2 along the X direction is in the range of 20 mm to 80 mm, including 20 mm, 25 mm, 30 mm, 35 mm, 40 mm, 45 mm, 50 mm, 55 mm, 60 mm, 65 mm, 70 mm, 75 mm, and 80 mm.

[0088] In some embodiments, the following conditions are also met:

[0089]

[0090] 3.5mm≤W≤15mm,

[0091] 6mm≤W0≤20mm,

[0092] The pole mounting hole 201 is a track-shaped hole.

[0093] In this embodiment, the pole mounting hole 201 is in the shape of a track and field track, and the pole 3 adapted thereto is an elliptical pole. The dimensions of the elliptical pole and the rivet block 2 are further optimized and limited, and the ratio of the total width W of the rivet column section 302 along the Y direction to the width W0 of the rivet block 2 along the Y direction is controlled within a range of 50% to 80%. If this ratio is too small, less than 50%, the pole 3 itself will be too narrow, increasing the difficulty of the riveting process. If this ratio is too large, greater than 80%, the punching rivet needle will easily break, increasing the difficulty of the riveting process. At the same time, a large width ratio will also cause the pole 3 to expand excessively during riveting in the Y direction, causing local deformation and expansion, affecting the visual positioning of the battery cell and busbar during welding, and thus causing the weld mark to be misaligned.

[0094] The total width W of the riveted column section 302 along the Y direction is between 3.5 mm and 15 mm, including 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm, 7.5 mm, 8 mm, 8.5 mm, 9 mm, 9.5 mm, 10 mm, 10.5 mm, 11 mm, 11.5 mm, 12 mm, 12.5 mm, 13 mm, 13.5 mm, 14 mm, 14.5 mm, and 15 mm.

[0095] The width W0 of the riveting block 2 along the Y direction is between 6 mm and 20 mm, including 6 mm, 8 mm, 10 mm, 12 mm, 15 mm, 18 mm, and 20 mm.

[0096] In some embodiments, the following conditions are also met:

[0097]

[0098] 7mm≤L1≤45mm,

[0099] Wherein, L1 is the distance from the center of the pole 3 to any end of the riveting block 2 along the X direction, in mm;

[0100] The pole mounting hole 201 is a track-shaped hole or a circular hole.

[0101] In this embodiment, the pole mounting hole 201 is a track-shaped hole or a circular hole, and the poles 3 adapted thereto are elliptical poles and circular poles, respectively. The limitations of this embodiment apply to both types of poles 3. The dimensions of the pole 3 and the riveting block 2 are further optimized and limited, and the ratio of the distance L1 from the center of the pole 3 to either end of the riveting block 2 along the X direction to the width W0 of the riveting block 2 along the Y direction is controlled within the range of 0.5 to 3.0. If this ratio is too small, less than 0.5, the local strength of the riveting block 2 will be insufficient, and after riveting, the edges of the riveting block 2 will easily swell and deform; if this ratio is too large, greater than 3.0, the ends of the riveting block 2 along the X direction will easily warp and deform, increasing the flatness value of the riveting block 2.

[0102] Since the pole 3 in the cell cover assembly has two arrangements relative to the riveted block 2: central arrangement and eccentric arrangement, This relationship applies to both approaches. When the pole 3 is centered relative to the riveted block 2, 2L1 = L0. When the pole 3 is eccentric relative to the riveted block 2, L1 can be the distance along the X direction from the center of the pole mounting hole 201 to either end of the riveted block 2.

[0103] In some embodiments, the following conditions are also met:

[0104]

[0105] The pole mounting hole 201 is a track-shaped hole.

[0106] In this embodiment, the pole mounting hole 201 is a track-shaped hole, and the pole 3 adapted thereto is an elliptical pole. This embodiment further optimizes and limits the dimensions of the elliptical pole and the riveted block 2. Half of the difference between the width W0 of the riveted block 2 along the Y direction and the total width W occupied by the riveted column section 302 along the Y direction represents the remaining margin between the pole 3 and the riveted block 2 along the Y direction. This remaining margin is limited to not less than 1.5 mm. Otherwise, the remaining margin is too small, and local deformation of the riveted block 2 on both sides along the Y direction is likely to occur after riveting. Therefore, limiting the remaining margin from the pole 3 to the riveted block 2 along the Y direction to be greater than or equal to 1.5 mm can further optimize the flatness of the riveted block 2 after riveting.

[0107] In some embodiments, the following conditions are also met:

[0108]

[0109] The pole mounting hole 201 is a track-shaped hole.

[0110] In this embodiment, the pole mounting hole 201 is in the shape of a track and field track, and the pole 3 adapted therewith is an elliptical pole. This embodiment further optimizes and limits the dimensions of the elliptical pole and the riveted block 2. The ratio of the total length L of the riveted column segment 302 along the X direction to the total width W of the riveted column segment 302 along the Y direction is controlled within a range of 1 to 3.5. This further reduces the warping of the riveted block 2 after riveting, improves the flatness of the riveted block 2, and ensures that the riveted block 2 and the pole 3 are easily riveted together, reducing the difficulty of the riveted process.

[0111] To verify the technical effects of the above embodiments, specific examples and comparative examples are provided below. In particular, poles 3 are all elliptical poles. Specific results are detailed in Table 2.

[0112] Table 2

[0113]

[0114] From Table 2 we can see that:

[0115] 1. All of Examples 6 to 10 meet the following requirements: The measured results are good, and the flatness of the riveted block 2 is further optimized within the required range, with no problems such as deformation or outward expansion on the four sides.

[0116] 2. Pole 3 and riveted block 2 meet In Comparative Example 9, the ratio is too small, less than 8%. Although the flatness of the riveted block 2 is within the required range, the flatness value increases. In Comparative Example 12, the ratio is too large, greater than 30%. Although the flatness of the riveted block 2 is within the required range, the welding area between the riveted block 2 and the busbar is reduced, affecting the ability to pass current. Therefore, By controlling the flatness within the range of 8% to 30%, the flatness of the riveted block 2 after riveting can be further optimized, while ensuring that there is sufficient welding area between the riveted block 2 and the busbar, thereby ensuring the flow capacity.

[0117] 3. Pole 3 and riveted block 2 meet In comparative example 10, the ratio is too small, less than 50%. Although the flatness of the rivet block 2 is within the required range, the width of the pole 3 itself will be too narrow, which increases the difficulty of riveting processing. In comparative example 11, the ratio is too large, greater than 80%. Although the flatness of the rivet block 2 is within the required range, the punching and rivet needle head will be easily broken, which increases the difficulty of riveting processing. At the same time, a too large width ratio will also cause the pole 3 to swell excessively during riveting in the Y direction, causing local deformation and expansion, affecting the visual positioning of the battery cell and busbar during welding, thereby causing weld mark deviation.

[0118] 4. Pole 3 and riveted block 2 meet In Comparative Example 13, the ratio is too small, less than 0.5. Although the flatness of the riveted block 2 is within the required range, it will lead to insufficient local strength of the riveted block 2, and the edges of the riveted block 2 are prone to swelling and deformation after riveting. In Comparative Example 9, the ratio is too large, greater than 3.0. Although the flatness of the riveted block 2 is within the required range, the ends of the riveted block 2 along the X direction are prone to warping and deformation, which increases the flatness value of the riveted block 2.

[0119] In some embodiments, the pole 3 further includes a pole base plate 304 and a pole body 305. One end of the pole body 305 of the pole 3 is connected to the assembly column section 301, and the other end of the pole body 305 is connected to the pole base plate 304. The pole body 305 mates with the assembly hole 101 of the cover plate. The pole base plate 304 and the rivet block 2 are respectively provided on either side of the cover plate 1. The pole 3 sequentially passes through the assembly hole 101 and the pole mounting hole 201 before being riveted to the rivet block 2.

[0120] Specifically, the pole bottom plate 304 of the pole 3 is arranged on one side of the cover plate 1. After the battery cover plate assembly is assembled with the battery shell, the pole bottom plate 304 is close to the pole group and is used to be welded with the pole ear of the pole group to conduct current from the inside of the battery cell through the pole 3 to the outside.

[0121] In some embodiments, a first insulating member 4 and a second insulating member 5 are further included. The first surface of the cover plate 1 and the rivet block 2 are insulated and connected via the first insulating member 4 , and the second surface of the cover plate 1 and the pole 3 are insulated and connected via the second insulating member 5 .

[0122] Specifically, in some embodiments, the first insulating member 4 and the second insulating member 5 are both plastic members. The first insulating member 4 and the second insulating member 5 are used to ensure insulation between the cover plate 1 and the rivet block 2, and between the cover plate 1 and the pole 3, thereby preventing short circuits or leakage in the battery cell and improving the safety and reliability of the battery cell.

[0123] In some embodiments, the battery cell cover assembly further includes an explosion-proof valve 7 and an explosion-proof valve patch 8. The cover 1 is provided with an explosion-proof valve mounting hole, within which the explosion-proof valve 7 is positioned. The explosion-proof valve patch 8 is attached to the upper surface of the explosion-proof valve mounting hole to protect the explosion-proof valve 7. The explosion-proof valve 7 is designed to rapidly explode and release pressure in the event of thermal runaway in the battery cell, thereby ensuring battery safety.

[0124] In some embodiments, the blade battery cell cover plate assembly also includes a sealing ring 6, which is sleeved on the pole body 305, at least part of the sealing ring 6 is arranged between the pole body 305 and the assembly hole 101 of the cover plate 1, and at least part of the sealing ring 6 is arranged between the pole base plate 304 and the cover plate 1. In this way, the sealing ring 6 can form a seal between the pole 3 and the cover plate 1 along the Z direction and the XY plane, thereby improving the sealing, reliability and safety of the battery cell.

[0125] According to an embodiment of the present invention, in a second aspect, a battery cell is further provided, comprising a shell, a pole group and the battery cell cover assembly of the above embodiment, wherein the shell has a accommodating cavity and an opening connected to the accommodating cavity; the pole group is arranged in the accommodating cavity of the shell; the battery cell cover assembly is arranged in the opening of the shell to encapsulate the pole group in the shell.

[0126] The cell cover assembly is applied to the battery cell to seal the opening of the cell housing, sealing and protecting the internal components of the battery, preventing chemical leakage and the impact of the external environment on the battery. The pole 3 of the cell cover assembly provides a path for current to flow in and out, ensuring current conduction during the battery cell's charging and discharging process. The cell cover assembly not only serves as an electrical connection for the battery cell but also enhances the overall structural stability of the battery cell. It is an important component of the battery cell, ensuring the durability and safety of the battery cell during use.

[0127] In some embodiments, the battery cell is a blade battery cell.

[0128] Because the battery cell includes a battery cell cover plate assembly and has all the technical effects of the battery cell cover plate assembly, it will not be repeated here.

[0129] According to an embodiment of the present invention, in a third aspect, a battery pack is further provided, comprising a plurality of battery cells according to the above embodiments, wherein the rivet blocks 2 of adjacent battery cells are welded via a busbar.

[0130] Because the battery pack includes battery cells and has all the technical effects of battery cells, they will not be described here.

[0131] Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention. Such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A battery cover assembly, characterized in that: include: A cover plate, wherein the cover plate is provided with an assembly hole; A riveting block, wherein the riveting block is provided with a pole mounting hole, the riveting block is a rectangular structure, and the pole mounting hole is a stepped hole including an assembly hole section and a riveting hole section; A pole, wherein the pole is riveted to the riveting block, and the riveted pole comprises an assembly column section cooperating with the assembly hole section and a riveted column section cooperating with the riveted hole section, wherein a concave riveting groove is formed on the top of the riveted column section; The dimensions of the riveting block and the pole meet the following requirements: in, L is the total length of the riveted column along the X direction, in mm. W is the total width of the riveted column along the Y direction, in mm. L0 is the length of the riveting block along the X direction, in mm. W0 is the width of the riveting block along the Y direction, in mm.

2. The battery cover assembly according to claim 1, characterized in that: Also meets: 5mm≤L≤25mm, 20mm≤L0≤80mm, The pole mounting hole is in the shape of an athletic track.

3. The battery cover assembly according to claim 1 or 2, characterized in that: Also meets: 3.5mm≤W≤15mm, 6mm≤W0≤20mm, The pole mounting hole is in the shape of an athletic track.

4. The battery cover assembly according to claim 1 or 2, characterized in that: Also meets: 7mm≤L1≤45mm, Wherein, L1 is the distance from the center of the pole to either end of the riveted block along the X direction, in mm; The pole mounting hole is a track-and-field track-shaped hole or a circular hole.

5. The battery cover assembly according to claim 1 or 2, characterized in that: Also meets: The pole mounting hole is in the shape of an athletic track.

6. The battery cover assembly according to claim 1 or 2, characterized in that: Also meets: The pole mounting hole is in the shape of an athletic track.

7. The battery cover assembly according to claim 1 or 2, characterized in that: The pole also includes a pole bottom plate, the assembly column section of the pole is connected to the pole bottom plate, the pole bottom plate and the rivet block are respectively arranged on both sides of the cover plate, and the pole passes through the assembly hole and the pole mounting hole in sequence and is riveted to the rivet block.

8. The battery cover assembly according to claim 1 or 2, characterized in that: It also includes a first insulating member and a second insulating member. The first surface of the cover plate and the rivet block are insulated and connected via the first insulating member, and the second surface of the cover plate and the pole are insulated and connected via the second insulating member.

9. A battery cell, characterized in that: include: a housing, the housing comprising a receiving cavity and an opening communicating with the receiving cavity; a pole group, the pole group being arranged in the accommodating cavity of the shell; The battery cell cover plate assembly according to any one of claims 1 to 8, wherein the battery cell cover plate assembly is arranged at the opening of the shell, and the electrode group is encapsulated in the shell.

10. A battery pack, characterized in that: The invention comprises a plurality of battery cells according to claim 9, wherein the rivet blocks of adjacent battery cells are welded by a busbar.

Images