Battery and battery module

Abstract

A battery (1000) and a battery module. The battery (1000) comprises a battery housing (100) and a cap assembly (200). The battery housing (100) comprises a body (1). The body (1) comprises a side wall (11) extending in a first direction and an end wall (12) connected to one end of the side wall (11). The end wall (12) comprises a first surface (121) and a second surface (122) opposite to each other in the first direction. The first surface (121) faces an explosion-proof sheet (4). The end wall (12) is provided with a recess (2) on the second surface (122). The recess (2) is recessed from the second surface (122) to the first surface (121).

Description

Batteries and battery modules

[0001] This application claims priority to the Chinese patent application with application number 202323460665.4 filed with the China Patent Office on December 18, 2023, priority to the Chinese patent application with application number 202311750467.3 filed with the China Patent Office on December 18, 2023, and priority to the Chinese patent application with application number 202323459472.7 filed with the China Patent Office on December 18, 2023. The entire contents of the above applications are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of battery technology, and in particular to a battery and a battery module. Background Art

[0003] In related technologies, in order to release the internal pressure of the battery in time when thermal runaway occurs, an explosion-proof valve is installed near the end of the battery. When the internal pressure of the battery is too high, the high-pressure gas inside the battery will break through the explosion-proof valve to release the pressure to avoid causing safety accidents. SUMMARY OF THE INVENTION

[0004] However, in the case of a sharp increase in the internal pressure of the battery, this arrangement may cause the battery to explode due to the excessive internal pressure, if the explosion-proof valve fails to release the pressure in time.

[0005] In a first aspect, the present application provides a battery, comprising:

[0006] A battery housing includes a body, the body including a side wall extending along a first direction and an end wall connected to one end of the side wall; and

[0007] a cap assembly, disposed on a side of the side wall away from the end wall, and comprising a bursting disc, the bursting disc being opposite to the end wall;

[0008] The end wall includes a first surface and a second surface opposite to each other in a first direction, the first surface faces the explosion-proof plate, and the end wall is provided with a groove on the second surface, the groove is recessed from the second surface to the first surface, and the vertical distance from the lowest point of the groove to the first surface in the first direction is defined as D; wherein D satisfies: 0.03mm≤D≤0.08mm.

[0009] In a second aspect, the present application proposes a battery module comprising a plurality of batteries. Beneficial effects

[0010] In an embodiment of the present application, a groove is provided on the end wall of the main body, and the groove and the explosion-proof plate are respectively located at the two ends of the battery shell in the first direction. When the battery undergoes thermal runaway and the internal pressure is too high, the groove on the end wall and the explosion-proof plate both collapse, and the internal high-pressure gas of the battery can be discharged to the outside of the battery from the end wall and the explosion-proof plate at the same time, thereby improving the pressure relief capacity of the battery in the event of thermal runaway and avoiding the risk of explosion of the battery in the event of thermal runaway. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] FIG1 is a schematic cross-sectional view of a battery provided in the present application;

[0012] FIG2 is a schematic cross-sectional view of the cap assembly provided by the present application;

[0013] FIG3 is a schematic diagram of the structure of the explosion-proof disk provided in this application;

[0014] FIG4 is an enlarged schematic diagram of point A in FIG1 ;

[0015] FIG5 is an enlarged schematic diagram of point B in FIG1 ;

[0016] FIG6 is a schematic structural diagram of the end wall provided by the present application;

[0017] FIG7 is a schematic structural diagram of the end wall provided by the present application;

[0018] FIG8 is a schematic diagram of the assembly of the battery housing and the busbar provided by the present application;

[0019] FIG9 is a partial cross-sectional schematic diagram of a battery provided by the present application;

[0020] FIG10 is a partial cross-sectional schematic diagram of a battery provided by the present application;

[0021] FIG11 is a schematic cross-sectional view of a sealing member provided in the present application;

[0022] FIG12 is a partial cross-sectional schematic diagram of the assembled battery housing and cap body provided in the present application.

[0023] Description of reference numerals:

[0024] 1000, battery; 100, battery case; 1, body; 11, side wall; 12, end wall; 12A, first area; 12B, second area; 1A, first sub-area; 1B, second sub-area; 2, groove; 3, busbar; 200, cap assembly; 4, explosion-proof disk; 5, notch; 121, first surface; 122, second surface; 21, first groove wall; 22, second groove wall; 23, third groove wall; 2A, first side; 2B, second side; 6, cap body; 11A, main body; 12A, port; 2A, end face; 3A, seal; 31, embedded portion; 32, convex portion; 6, cap body; 5A, cavity; 6A, sealing area; 41A, pressure-bearing surface. Modes for Carrying Out the Invention

[0025] In the description of this application, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and can refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0026] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature includes the first feature being directly above and obliquely above the second feature, with the first feature having a higher horizontal height than the second feature. A first feature being "below," "below," and "below" a second feature includes the first feature being directly below and obliquely below the second feature, with the first feature having a lower horizontal height than the second feature.

[0027] In the description of this embodiment, terms such as "upper," "lower," "left," "right," "front," and "rear" are used to refer to positions or locations based on the positions or locations shown in the accompanying drawings. These terms are intended to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and do not have any special meanings.

[0028] Please refer to Figures 1, 4, 5 and 8. The battery 1000 includes a battery housing 100 and a cap assembly 200. The battery housing 100 includes a body 1, which includes a side wall 11 extending along a first direction X and an end wall 12 connected to one end of the side wall 11; the cap assembly 200 is arranged on a side of the side wall 11 away from the end wall 12, and includes an explosion-proof disk 4, which is opposite to the end wall 12; wherein the end wall 12 includes a first surface 121 and a second surface 122 opposite to each other in the first direction X, the first surface 121 faces the explosion-proof disk 4, the end wall 12 is provided with a groove 2 on the second surface 122, the groove 2 is recessed from the second surface 122 to the first surface 121, and the vertical distance from the lowest point of the groove 2 to the first surface 121 in the first direction X is D; wherein D satisfies: 0.03mm≤D≤0.08mm.

[0029] In an embodiment of the present application, a groove 2 is provided on the end wall 12 of the main body 1, and the groove 2 and the explosion-proof plate 4 are respectively located at the two ends of the battery housing 100 in the first direction X. When the battery 1000 undergoes thermal runaway and the internal pressure is too high, the groove 2 on the end wall 12 and the explosion-proof plate 4 both collapse, and the internal high-pressure gas of the battery 1000 can be discharged from the end wall 12 and the explosion-proof plate 4 to the outside of the battery 1000 at the same time, thereby improving the pressure relief capacity of the battery 1000 when thermal runaway occurs, and avoiding the risk of explosion of the battery 1000 when thermal runaway occurs.

[0030] It should be noted that if the D value is less than 0.03 mm, there may be a risk of insufficient structural strength at a local position of the end wall 12 of the battery shell 100, and the explosion-proof plate 4 may not collapse to release pressure while the groove 2 may have collapsed, thereby causing the battery shell 100 to burst; of course, if the D value is less than 0.03 mm, it is also easy to cause the end wall 12 to crack when the groove 2 is machined on the end wall 12; and if the D value is greater than 0.08 mm, when the explosion-proof plate 4 collapses to release pressure, the groove 2 may not collapse and the internal gas of the battery 1000 cannot be depressurized at the end wall 12, thereby causing the battery shell 100 to burst.

[0031] Furthermore, the vertical distance D between the lowest point of the groove 2 and the first surface 121 in the first direction X is set within the range of 0.03 mm to 0.08 mm. This can meet the design requirement that when the internal pressure of the battery 1000 reaches between 1.90 MPa and 3.15 MPa, the explosion-proof disc 4 and the end wall 12 can jointly collapse to relieve the high-pressure gas inside the battery 1000. It should be noted that in some embodiments of the present application, the explosion-proof disc 4 can collapse when the internal pressure of the battery 1000 reaches between 1.90 MPa and 2.73 MPa. Similarly, the explosion-proof disc 4 can collapse when the instantaneous pressure of the battery 1000 exceeds 2.73 MPa during thermal runaway. Specifically, the structural design of the groove 2 provided on the end wall 12 satisfies the following D value: 0.03 mm ≤ D ≤ 0.08 mm, and the end wall 12 can collapse when the internal pressure of the battery 1000 reaches between 1.90 MPa and 3.15 MPa.

[0032] In some embodiments of the present application, the end wall 12 collapses when the internal pressure of the battery 1000 reaches 2.70 MPa to 3.15 MPa. This configuration allows the internal pressure of the battery 1000 to be relieved through the explosion-proof plate 4 when it has not reached the pressure at which the end wall 12 collapses, that is, when it is between 1.90 MPa and 2.70 MPa, to avoid the end wall 12 of the battery shell 100 being damaged and causing danger; and when the internal pressure of the battery 100 is too high, that is, when it is between 2.70 MPa and 3.15 MPa, the pressure can be relieved through the explosion-proof plate 4 and the end wall 12 together to avoid the overall damage of the battery shell 100 and causing danger.

[0033] Please refer to FIG. 2 . In one embodiment of the present application, the cap assembly 200 includes a sealing member 3A, and the explosion-proof disk 4 is disposed in a space enclosed by the sealing member 3A.

[0034] Referring to FIG. 5 , in some embodiments of the present application, the groove 2 is arc-shaped. The groove 2 includes a first groove wall 21 and a second groove wall 22 arranged opposite each other along a radial direction of the circle in which the groove 2 is located. Both the first groove wall 21 and the second groove wall 22 are arc-shaped, and the plane of the first groove wall 21 intersects the plane of the second groove wall 22. The angle between the plane of the first groove wall 21 and the plane of the second groove wall 22 is θ, where θ satisfies the following: 25° ≤ θ ≤ 65°. This arrangement reduces the bottom area of ​​the groove 2 while maintaining the same opening size, thereby reducing the area of ​​collapse of the groove 2 during pressure relief of the battery case 100. In one embodiment of the present application, θ further satisfies the following: 50° ≤ θ ≤ 65°. That is, in this embodiment, the angle θ is further limited to between 50° and 65°. This further reduces the bottom area of ​​the groove 2 while maintaining the same opening size, thereby reducing the area of ​​collapse of the groove 2 during pressure relief of the battery case 100.

[0035] In some embodiments of the present application, the groove 2 further includes a third groove wall 23 connecting the first groove wall 21 and the second groove wall 22. The lowest point of the groove 2 is located on the third groove wall 23. The third groove wall 23 is arranged in an arc shape, and the center of the circle corresponding to the arc shape of the third groove wall 23 is located in the groove 2. The radius of the circle on which the arc shape of the third groove wall 23 is located is R. Wherein, R satisfies: 0.05mm≤R≤0.1mm. In this embodiment, since the head position of the stamping die for processing the groove 2 in the related art is set as a rounded corner, the center radius of the circle corresponding to the arc shape of the third groove wall 23 is set in the range of 0.05mm to 0.1mm, that is, when the stamping die is stamped, a third groove wall 23 with a radius R between 0.05mm and 0.1mm will be formed. Similarly, the rounded corner setting of the head of the stamping die for processing the groove 2 can avoid damage to the part to be stamped of the end wall 12 during stamping, and can also prevent the groove width of the groove 2 from being too large after stamping.

[0036] Referring to Figures 2, 3, and 6, in some embodiments of the present application, the explosion-proof disc 4 is provided with a notch 5, which is arc-shaped. The angle between the center of the circle containing the notch 5 and the line connecting the two ends of the notch 5 is α, where α satisfies the following conditions: 0°≤α≤22°. The groove 2 is arc-shaped. The angle between the center of the circle containing the notch 2 and the line connecting the two ends of the notch 2 is β, where β satisfies the following conditions: 0°≤β≤22°. In this embodiment, the angle α between the center of the circle containing the notch 5 and the line connecting the two ends of the notch 5, and the angle β between the center of the circle containing the notch 2 and the line connecting the two ends of the notch 2 are both set between 0° and 22°, thereby improving the similarity of the pressure relief paths at both ends of the battery 1000 in the first direction X, thereby enhancing the uniform exhaust and pressure relief effect within the battery 1000. It can be understood that when the α value is fixed in the range of 0° to 22°, the β value can be any value in the range of 0° to 22° to design the size of the groove 2. Similarly, when the β value is fixed in the range of 0° to 22°, the α value can be any value in the range of 0° to 22° to design the size of the groove 5.

[0037] In one embodiment of the present application, the value of α is between 18° and 22°, that is, 18°≤α≤22°; the value of β is between 0° and 22°, that is, 0°≤β≤22°.

[0038] In some embodiments of the present application, the notches 5 and the grooves 2 are arranged opposite to each other in the first direction X. In other words, such an arrangement in this embodiment can further improve the consistency of the pressure relief paths of the high-pressure gas at both ends of the battery 1000 in the first direction X, thereby preventing the battery housing 100 from bursting when the battery 1000 releases pressure due to thermal runaway.

[0039] Referring to Figures 7 and 8 , the end wall 12 includes a first region 12A and a second region 12B configured for welding to the busbar 3. At least a portion of the groove 2 is located in the first region 12A. Since the thickness of the end wall 12 in the local area where the groove 2 is located decreases in the first direction X, and the busbar 3 and end wall 12 are welded together during assembly of the battery 1000, to prevent the reduced thickness of the end wall 12 in the first direction X at the local area where the groove 2 is located from affecting the welding of the busbar 3 and thereby preventing the busbar 3 from penetrating the end wall 12 during welding, in this embodiment, at least a portion of the groove 2 is located at a position offset from the welding position of the busbar 3 on the end wall 12. That is, at least a portion of the groove 2 is located in the first region 12A, and the welding region between the busbar 3 and the end wall 12 is located in the second region 12B.

[0040] It can be understood that, in the second area 12B, part of the end wall 12 is welded to the bus plate 3; therefore, part of the groove 2 can also be located in the area of ​​the end wall 12 in the second area 12B that is not welded to the bus plate 3, but since the specific welding position of the bus plate 3 in the second area 12B is not limited, in order to make the opening position of the groove 2 applicable to the production process of different bus plate 3 welding methods, in one embodiment of the present application, the entire part of the groove 2 is located in the first area 12A.

[0041] Furthermore, the welding between the busbar 3 and the end wall 12 may be performed by spot welding, line welding, etc. It should be noted that, in one embodiment, when the recess 2 is partially located in the second region 12B, the welded portion between the busbar 3 and the end wall 12 needs to be offset from the location of the recess 2 .

[0042] In some embodiments of the present application, the second region 12B includes a first sub-region 1A and a second sub-region 1B, with the first region 12A being located between the first sub-region 1A and the second sub-region 1B. In the related art, the welding regions between the busbar 3 and the end wall 12 are located in two different regions on the end wall 12. Therefore, the two regions in the related art where the welding regions between the busbar 3 and the end wall 12 are located in two different regions on the end wall 12 are the first sub-region 1A and the second sub-region 1B of this embodiment. The first region 12A is located between the first sub-region 1A and the second sub-region 1B. On the basis of satisfying the welding regions between the end wall 12 and the busbar 3 in the related art, at least a portion of the groove 2 is provided in the first region 12A to prevent the end wall 12 from being welded through when the end wall 12 and the busbar 3 are welded.

[0043] It is understood that, in one embodiment, the welding area of ​​the busbar 3 may be located only in the first sub-area 1A; in another embodiment, the welding area of ​​the busbar 3 may be located only in the second sub-area 1B; and in yet another embodiment, the welding area of ​​the busbar 3 may be located in both the first sub-area 1A and the second sub-area 1B. Part of the size design of the groove 2 can avoid the range of the first sub-area 1A and the second sub-area 1B at the same time, allowing the battery case 100 to be simultaneously applied to production processes with different busbar 3 welding methods, thereby improving the versatility of the battery case 100.

[0044] In some embodiments of the present application, the first sub-region 1A is arranged in a circular shape, the second sub-region 1B is arranged in an annular shape, and the groove 2 is arranged in an arc shape; the groove 2 includes a first side 2A and a second side 2B arranged opposite to each other in the radial direction of the circle in which the groove 2 is located, and the first side 2A and the second side 2B are both arranged in an arc shape; the diameter of the circle in which the first side 2A is located is L1, the diameter of the circle in which the second side 2B is located is L2, the diameter of the first sub-region 1A is L3, and the inner diameter of the second sub-region 1B is L4; wherein L1, L2, L3 and L4 satisfy: L3≤ (L1+L2)≤L4. It can be understood that, since the first sub-region 1A is circular, the second sub-region 1B is annular, and the groove 2 is arc-shaped, that is, the diameter of the circle where the groove 2 is located is designed to be between the diameter L3 of the first sub-region 1A and the inner diameter L4 of the second sub-region 1B, it is possible to avoid interference between the opening of the groove 2 and the welding of the busbar 3 and the end wall 12; and on this basis, since the groove 2 includes a first side 2A and a second side 2B in the radial direction of the circle where it is located, (L1+L2) is the median of the shortest straight-line distance between the first side 2A and the second side 2B in the radial direction of the circle where the groove 2 is located. This setting ensures that the opening of the groove 2 on the end wall 12 does not interfere with the welding of the end wall 12 and the busbar 3.

[0045] In some embodiments of the present application, L3 and L4 also satisfy: 2mm≤L3≤6mm, L4≥12mm. That is, in this embodiment, the size range of L3 is the welding range of the busbar 3 in the first sub-area 1A and the end wall 12; the size range of L4 is the welding range of the busbar 3 in the second sub-area 1B and the end wall 12; wherein the outer diameter of the second sub-area 1B is L5, and L5 also satisfies: L5≤15mm. That is, the size range between 12mm and 15mm is the welding range of the busbar 3 in the second sub-area 1B and the end wall 12. Therefore, in one embodiment of the present application, 6mm≤ (L1+L2)≤12mm. This configuration allows at least a portion of the groove 2 to be located within the first region 12A, thereby preventing the groove 2 from interfering with the specific welding positions of the busbar 3 and the end wall 12 within the first sub-region 1A and the second sub-region 1B.

[0046] In some embodiments of the present application, L1 and L2 also satisfy: 8 mm ≤ (L1+L2)≤10mm. This arrangement ensures that the entire groove 2 is located within the first interval, so that the opening of the groove 2 does not interfere with the welding of the inner end wall 12 of the first sub-area 1A and / or the second sub-area 1B and the busbar 3.

[0047] Referring to Figure 4 , in some embodiments of the present application, the vertical distance between the first surface 121 and the second surface 122 of the end wall 12 in the first direction X is H; where H satisfies the following: 0.3mm≤H≤0.8mm. In other words, in this embodiment, this configuration ensures that the strength of the battery case 100 meets usage requirements. If H is less than 0.3mm, the battery case 100 may be insufficiently strong. If H is greater than 0.8mm, the overall thickness of the end wall 12 in the first direction X is too thick, which may make it difficult for the end wall 12 to collapse and release the high-pressure gas inside the battery 1000.

[0048] Please refer to Figure 4. In some embodiments of the present application, the end wall 12 is circular; the diameter of the end wall 12 is L6; wherein L6 satisfies: 18.10mm≤L6≤21.40mm. That is, in this embodiment, the dimensional design of the D value, R value, θ value, β value, L1 value, and L2 value of the groove 2 on the end wall 12 can be applied to battery 1000 products whose end wall 12 of the battery shell 100 has a diameter of 18.10mm to 21.40mm, so as to avoid the battery shell 1000 products whose end wall 12 of the battery shell 100 has a diameter of 18.10mm to 21.40mm from exploding when thermal runaway occurs. In addition, it should be added that in some embodiments of the present application, the material of the battery shell 100 is steel.

[0049] The technical solutions and technical effects of this application are described in detail below through some embodiments.

[0050] D (unit: mm) θ (unit: °) Pressure inside the battery case when the end wall collapses (unit: MPa) Example 1 0.0335 8.912.215 Example 2 0.0335 5.922.187 Example 3 0.0366 1.562.232 Example 4 0.0395 7.062.172 Example 5 0.0395 6.472.437 Example 6 0.045 4.832.32 Example 7 0.0415 1.831.967 Example 8 0.0425 6.032.472 Example 9 0.0435 7.31.972 Example 10 0.0465 5.962.395 Example 11 0.0485 4.27 2.28 Example 120.04855.592.065 Example 130.05154.412.415 Example 140.05254.253.002 Example 150.0655.672.897 Example 160.06457.463.124 Example 170.06552.452.895 Example 180.06651.162.87 Example 190.06955.612.963 Example 200.0754.913.112 Example 210.0754.292.937 Example 220.07453.913.111 Example 230.07952.13.002

[0051] in conclusion:

[0052] As can be seen from the table, when the D value satisfies 0.03mm≤D≤0.08mm and the θ value satisfies 25°≤θ≤65°, the design of the groove 2 on the end wall 12 can meet the design requirement that the end wall 12 collapses when the pressure relief pressure is between 1.90MPa and 3.15MPa. That is, the end wall 12 collapses when the gas pressure inside the battery 1000 is between 1.90MPa and 3.15MPa, and cooperates with the explosion-proof disk 4 to simultaneously relieve pressure at both ends of the battery 1000, thereby preventing the battery housing 100 from bursting, thereby improving the pressure relief capacity of the battery 1000.

[0053] Please refer to Figures 9 to 11. The side wall 11 includes a main body portion 11A arranged in a cylindrical shape and a port portion 12A connected to the main body portion 11A. The port portion 12A is provided with an end face 2A on the side away from the main body portion 11A; the cap assembly 200 includes a sealing member 3A, and the sealing member 3A includes an embedding portion 31 and a convex portion 32. The embedding portion 31 is formed by bending and compacting the sealing member 3A toward the inner wall of the main body portion 11A from the port portion 12A. At least a portion of the end face 2A is embedded in the embedding portion 31. The convex portion 32 is connected to the embedding portion 31. The convex portion 32 covers the area of ​​the end face 2A that is not embedded in the embedding portion 31.

[0054] In the embodiment of the present application, the end surface 2A of the port portion 12A which is not provided with a coating protection is covered and protected by the embedding portion 31 and the protrusion 32, thereby preventing the end surface 2A from directly contacting the air and improving the rusting condition of the end surface 2A.

[0055] It can be understood that bending the side wall 11 of the battery 1000, that is, bending the port portion 12A, can fix the seal 3A and other components in the battery 1000. In some embodiments of the present application, the seal 3A has a certain elastic deformation ability. Therefore, when the port portion 12A presses the embedding portion 31, the part of the embedding portion 31 close to the end face 2A will block part of the end face 2A due to its own deformation, and at the same time cooperate with the protrusion 32 set on the embedding portion 31 to block the entire part of the end face 2A.

[0056] Referring to Figures 9, 10, and 12, in some embodiments of the present application, the battery 1000 further includes a cap body 6, which is disposed within a cavity 5A of the main body 11A near the port portion 12A. A sealing area 6A is provided between the edge of the cap body 6 and the inner wall of the main body 11A. At least a portion of the seal 3A is disposed within the sealing area 6A, and the seal 3A forms an interference fit with the edge of the cap body 6 and the inner wall of the main body 11A. That is, in this embodiment, the seal 3A can seal the gap between the cap body 6 and the main body 11A, that is, seal the sealing area 6A. To ensure the sealing performance of the sealing area 6A between the cap body 6 and the main body 11A, the seal 3A forms an interference fit with portions of the cap body 6 and the main body 11A, thereby improving the sealing performance of the sealing area 6A.

[0057] In some embodiments of the present application, the cap body 6 is provided with a pressure-bearing surface 41A, and the port portion 12A is bent toward the inner wall of the main body portion 11A to compact the sealing member 3A, so that the sealing member 3A abuts against the pressure-bearing surface 41A to form an embedded portion 31. That is, in this embodiment, the portion of the sealing member 3A located between the port portion 12A and the pressure-bearing surface 41A of the cap body 6 also forms an interference fit with the portion of the port portion 12A and the cap body 6, thereby causing the portion of the sealing member 3A located at the end surface 2A to deform to form the embedded portion 31.

[0058] 9 , 11 , and 12 , in some embodiments of the present application, the port portion 12A is arranged to extend obliquely in a direction approaching the cap body 6. That is, in this embodiment, the vertical distance between the end of the port portion 12A connected to the main body 11A in the second direction Y and the cap body 6 in the first direction X is greater than the vertical distance between the end surface 2A and the cap body 6 in the first direction X, thereby ensuring the secure fixation and sealing of the side wall 11, the cap body 6, and the sealing member 3A.

[0059] Referring to FIG. 9 , in some embodiments of the present application, the angle γ between the extension line of the port portion 12A and the plane of the cap body 6 is defined; where γ satisfies the following: 4° ≤ γ ≤ 20°. This arrangement allows the port portion 12A to be bent and compacted to protect at least a portion of the end surface 2A by the encapsulating portion 31, while also sealing the gaps between the port portion 12A and the seal 3A, and between the seal 3A and the cap body 6. If γ is less than 4°, the sealing performance between the sidewall 11, the seal 3A, and the cap body 6 may be poor. If γ is greater than 20°, the seal 3A disposed between the port portion 12A and the cap body 6 will interfere with the bending of the port portion 12A, preventing the port portion 12A from bending too far. Furthermore, if the bending angle of the port portion 12A is too great, the seal 3A may be overly compacted, causing the seal 3A to deform beyond its elastic limit, thereby affecting the sealing performance between the sidewall 11 and the cap body 6.

[0060] Referring to FIG. 10 , in some embodiments of the present application, the portion of the seal 3A located on the side of the pressure-bearing surface 41A has a length L7 in the second direction Y, and the length of the enclosing portion 31 in the second direction Y has a length L8; wherein L7 and L8 satisfy the following relationship: 0.1L7≤L8≤0.4L7. That is, L8 is configured so that it is within this range to ensure that the enclosing portion 31 and the protrusion 32 can cover the end surface 2A. If L8 is greater than 0.4L7, a portion of the seal 3A may warp, resulting in a poor appearance of the seal 3A. If L8 is less than 0.1L7, the anti-rust protection function of the enclosing portion 31 and the protrusion 32 on the end surface 2A will be affected. In other words, the enclosing portion 31 and the protrusion 32 may easily separate from the end surface 2A under the action of external forces.

[0061] Please refer to Figure 10. In some embodiments of the present application, the maximum vertical distance from the side of the protrusion 32 facing away from the cap body 6 in the first direction X to the pressure-bearing surface 41A is L9, and the minimum vertical distance from the end surface 2A to the pressure-bearing surface 41A in the second direction is L10; wherein L9 and L10 satisfy the following: 0.6L9≤L10≤0.9L9. In other words, this configuration ensures that the embedded portion 31 and the protrusion 32 can cover the end surface 2A. If L10 is less than 0.6L9, part of the seal 3A may warp, resulting in a poor appearance of the seal 3A. If L10 is greater than 0.9L9, the anti-rust protection function of the embedded portion 31 and the protrusion 32 on the end surface 2A will be affected. In other words, the protrusion 32 and the embedded portion 31 may not completely cover the end surface 2A.

[0062] In addition, in some embodiments of the present application, the battery 1000 further includes a rust remover disposed on the end surface 2A. That is, in this embodiment, the rust remover, the embedded portion 31, and the protrusion 32 provide combined protection, thereby enhancing rust protection of the end surface 2A.

[0063] The rust preventive agent may be rust preventive oil, rust preventive paint or rust preventive glue, etc. In one embodiment of the present application, the rust preventive agent is configured as rust preventive oil.

[0064] The present application also proposes a battery module, which includes multiple batteries 1000. Since the battery module adopts all technical solutions of all embodiments of the battery 1000, it has at least the beneficial effects brought by all the technical solutions of the embodiments of the battery 1000, which will not be described one by one here.

Claims

1. A battery comprising: A battery housing (100) comprises a body (1), wherein the body (1) comprises a side wall (11) extending along a first direction and an end wall (12) connected to one end of the side wall (11); and A cap assembly (200) is arranged on a side of the side wall (11) away from the end wall (12), and comprises a bursting disc (4), wherein the bursting disc (4) is opposite to the end wall (12); The end wall (12) comprises a first surface (121) and a second surface (122) which are opposite to each other in the first direction, the first surface (121) faces the explosion-proof disk (4), and the end wall (12) is provided with a groove (2) on the second surface (122), the groove (2) is recessed from the second surface (122) to the first surface (121), and a vertical distance D from the lowest point of the groove (2) to the first surface (121) in the first direction is defined; wherein D satisfies: 0.03 mm ≤ D ≤ 0.08 mm.

2. The battery according to claim 1, wherein The groove (2) is arranged in an arc shape; the groove (2) comprises a first groove wall (21) and a second groove wall (22) which are arranged opposite to each other along the radial direction of the circle where the groove (2) is located, the first groove wall (21) and the second groove wall (22) are both in an arc shape, and the plane where the first groove wall (21) is located intersects with the plane where the second groove wall (22) is located; The angle between the plane where the first groove wall (21) is located and the plane where the second groove wall (22) is located is defined as θ; wherein θ satisfies: 25°≤θ≤65°.

3. The battery according to claim 2, wherein The θ also satisfies: 50°≤θ≤65°.

4. The battery according to claim 2, wherein The groove (2) further comprises a third groove wall (23) connecting the first groove wall (21) and the second groove wall (22); the lowest point of the groove (2) is located on the third groove wall (23); the third groove wall (23) is arranged in an arc shape, and the center of a circle corresponding to the arc shape where the third groove wall (23) is located is located in the groove (2); The radius of the circle where the arc shape of the third groove wall (23) is located is defined as R; wherein R satisfies: 0.05mm≤R≤0.1mm.

5. The battery according to any one of claims 1 to 4, wherein: The explosion-proof plate (4) is provided with a groove (5), and the groove (5) is arranged in an arc shape; the angle between the center of the circle where the groove (5) is located and the line connecting the two ends of the groove (5) is defined as α; wherein α satisfies: 0°≤α≤22°; The groove (2) is arranged in an arc shape; the angle between the center of the circle where the groove (2) is located and the line connecting the two ends of the groove (2) is defined as β; wherein β satisfies: 0°≤β≤22°.

6. The battery according to claim 5, wherein The notch (5) and the groove (2) are arranged opposite to each other in the first direction.

7. The battery according to any one of claims 1 to 4, wherein: The end wall (12) comprises a first region (12A) and a second region (12B) configured to be welded to the busbar (3); At least part of the groove (2) is arranged in the first area (12A).

8. The battery according to claim 7, wherein The second region (12B) includes a first sub-region (1A) and a second sub-region (1B), and the first region (12A) is located between the first sub-region (1A) and the second sub-region (1B).

9. The battery according to claim 8, wherein The first sub-region (1A) is arranged in a circular shape, the second sub-region (1B) is arranged in an annular shape, and the groove (2) is arranged in an arc shape; The groove (2) comprises a first side (2A) and a second side (2B) which are arranged opposite to each other in the radial direction of the circle where the groove (2) is located, and the first side (2A) and the second side (2B) are both arranged in an arc shape; The diameter of the circle where the first side (2A) is located is defined as L1, the diameter of the circle where the second side (2B) is located is defined as L2, the diameter of the first sub-region (1A) is defined as L3, and the inner diameter of the second sub-region (1B) is defined as L4; Wherein, L1, L2, L3 and L4 satisfy: L3≤ (L1+L2)≤L4.

10. The battery according to claim 9, wherein The L3 and L4 also satisfy: 2mm≤L3≤6mm, L4≥12mm.

11. The battery according to claim 10, wherein The L1 and the L2 also satisfy: 8mm≤ (L1+L2)≤10mm.

12. The battery according to any one of claims 1 to 4, wherein: A vertical distance from the first surface (121) to the second surface (122) of the end wall (12) in the first direction is defined as H; wherein H satisfies: 0.3 mm ≤ H ≤ 0.8 mm.

13. The battery according to any one of claims 1 to 4, wherein: The end wall (12) is arranged in a circular shape; The diameter of the end wall (12) is defined as L6; wherein L6 satisfies: 18.10 mm ≤ L6 ≤ 21.40 mm.

14. The battery according to any one of claims 1 to 4, wherein: The internal pressure of the battery housing (100) when the end wall (12) collapses is defined as A; wherein A satisfies: 1.90 MPa≤A≤3.15 MPa.

15. The battery according to claim 1, wherein The side wall (11) comprises a main body (11A) arranged in a cylindrical shape and a port portion (12A) connected to the main body (11A), and the port portion (12A) is provided with an end surface (2A) on a side away from the main body (11A); The cap assembly (200) further comprises a sealing member (3A), wherein the sealing member (3A) comprises an embedding portion (31) and a convex portion (32), wherein the embedding portion (31) is formed by bending the port portion (12A) toward the inner wall of the main body portion (11A) to compact the sealing member (3A), wherein at least a portion of the end surface (2A) is embedded in the embedding portion (31), and the convex portion (32) is connected to the embedding portion (31), and the convex portion (32) covers an area of ​​the end surface (2A) that is not embedded in the embedding portion (31).

16. The battery according to claim 15, wherein The cap assembly (200) also includes a cap body (6), which is arranged in a cavity (5A) of the main body (11A) near the port portion (12A), and a sealing area (6A) is arranged between the edge of the cap body (6) and the inner wall of the main body (11A), and at least a part of the sealing member (3A) is arranged in the sealing area (6A), and the sealing member (3A) is interference fit with the edge of the cap body (6) and the inner wall of the main body (11A).

17. The battery according to claim 16, wherein: The cap body (6) is provided with a pressure-bearing surface (41A), the port portion (12A) is bent toward the inner wall of the main body portion (11A) to compact the sealing member (3A), and the sealing member (3A) abuts against the pressure-bearing surface (41A) to form the embedded portion (31).

18. The battery according to claim 17, wherein The port portion (12A) is arranged to extend obliquely in a direction approaching the cap body (6).

19. The battery according to claim 18, wherein The angle between the extension line of the port portion (12A) and the plane where the cap body (6) is located is defined as γ; wherein γ satisfies: 4°≤γ≤20°.

20. The battery according to claim 17, wherein The length of the portion of the seal (3A) located on one side of the pressure-bearing surface (41A) in the second direction is defined as L7, and the length of the embedded portion (31) in the second direction is defined as L8; wherein L7 and L8 satisfy: 0.1L7≤L8≤0.4L7.

21. The battery according to claim 17, wherein The maximum vertical distance from the side of the protrusion (32) facing away from the cap body (6) in the first direction to the pressure-bearing surface (41A) is defined as L9, and the minimum vertical distance from the end surface (2A) in the first direction to the pressure-bearing surface (41A) is defined as L10; wherein L9 and L10 satisfy: 0.6L9≤L10≤0.9L9.

22. The battery according to any one of claims 15 to 21, wherein The battery further comprises a rust remover, and the rust remover is arranged on the end surface (2A).

23. The battery according to claim 22, wherein The rust remover is rust removing oil.

24. A battery module comprising a plurality of batteries according to any one of claims 1 to 23.

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