Battery

Abstract

The utility model relates to the technical field of batteries, and discloses a battery which comprises a body, an exhaust hole is formed in the body, and a containing groove is further formed in the area, corresponding to the exhaust hole, of the body; the anti-explosion valve is arranged in the containing groove; in the plane parallel to the body, the minimum distance between a welding mark formed by welding the anti-explosion valve and the containing groove and the edge of the body is f, and f is larger than or equal to 4 mm. According to the battery provided by the utility model, the minimum distance between the welding mark formed by welding the explosion-proof valve and the accommodating groove and the edge of the body is greater than or equal to 4mm, so that the influence on the explosion-proof valve in the battery cell manufacturing process, such as operations of welding the periphery of a shell cover and the like, can be reduced, the stress balance of the explosion-proof valve is ensured, the influence on the explosion-proof valve caused by external force is reduced, and the service life of the battery is prolonged. And the opening condition of the anti-explosion valve is accurate and controllable.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a battery. Background Technology

[0002] With the continuous development of the battery industry, lithium-ion batteries, with their high energy density, are widely used in the field of power batteries to provide power for vehicle operation. Explosion-proof valves play a crucial role in the safety of battery cells. When problems such as short circuits, overcharging, or overheating occur in the battery cell, the explosion-proof valve senses changes in the internal air pressure of the cell and opens in a timely manner to release pressure and prevent risks such as cell explosions or fires.

[0003] However, because explosion-proof valves need to meet the requirements of precise and controllable opening, some explosion-proof valves in the existing technology cannot be adapted to the battery cell manufacturing process, resulting in uncontrollable opening and posing safety hazards. Utility Model Content

[0004] In view of this, the present invention provides a battery to solve the problem of safety hazards caused by the inability of explosion-proof valves to meet the requirements of precise and controllable opening.

[0005] In a first aspect, this utility model provides a battery, comprising:

[0006] The main body has an exhaust hole, and a receiving groove is formed in the area of ​​the main body corresponding to the exhaust hole.

[0007] Explosion-proof valve, installed in the receiving tank;

[0008] The minimum distance between the weld mark formed by welding the explosion-proof valve and the receiving tank and the edge of the body is f, which is parallel to the plane of the body and satisfies f≥4mm.

[0009] Beneficial effects: The battery provided by the embodiment of this utility model can reduce the impact of the cell manufacturing process on the explosion-proof valve by making the minimum distance between the weld mark formed by welding the explosion-proof valve and the receiving groove and the edge of the body greater than or equal to 4mm. For example, operations such as welding around the shell cover can be reduced, thereby ensuring the balanced force on the explosion-proof valve, reducing the impact of external forces on the explosion-proof valve, and making the opening conditions of the explosion-proof valve precise and controllable.

[0010] In one optional embodiment, the depth of the receiving groove is a1 in a plane perpendicular to the body, and the thickness of the overlap of the explosion-proof valve is d0; the explosion-proof valve is received in the receiving groove and satisfies: 0mm≤a1-d0≤0.2mm;

[0011] The value of d0 is 0.4mm≤d0≤0.6mm; the value of a1 is 0.5mm≤a1≤0.6mm.

[0012] Beneficial effects: By making the depth a1 of the receiving groove greater than the thickness d0 of the overlap of the explosion-proof valve, it can be ensured that the receiving groove completely accommodates the explosion-proof valve, ensuring smooth assembly and welding of the explosion-proof valve and the light aluminum plate. If the height difference between the two is less than 0mm, the explosion-proof valve is likely to protrude from the body, which can easily cause wear to the explosion-proof valve. If the height difference between the two is greater than 0.2mm, it is easy to cause poor welding when welding the explosion-proof valve to the body.

[0013] In one alternative embodiment, the explosion-proof valve includes:

[0014] The grooved surface and the overlapping portion surrounding the circumferential edge of the grooved surface;

[0015] At least a portion of the grooved surface near the edge has recessed areas with peripheral grooves.

[0016] Beneficial effect: By forming peripheral grooves in at least a portion of the groove surface near the edge, and by locally thinning the peripheral grooves, a path guide can be formed for opening the groove surface, making it convenient for the explosion-proof valve to open according to the path of the peripheral grooves.

[0017] In one optional implementation, the residual thickness d2 of the peripheral groove is in the range of 90μm≤d2≤160μm.

[0018] In one optional embodiment, the peripheral grooves are located within the projection range of the vent hole on the plane perpendicular to the body; and the minimum distance between the peripheral grooves and the vent hole on the edge of the body is c, which satisfies: 1mm≤c≤3mm.

[0019] Beneficial effects: Since the peripheral grooves are located within the projection range of the vent hole, interference between the vent hole and the opening area of ​​the groove surface can be avoided when the explosion-proof valve opens along the peripheral grooves. By limiting the lower limit of the minimum distance c between the peripheral grooves and the vent hole at the edge of the body parallel to the plane of the body, interference between the vent hole and the opening area of ​​the groove surface can be avoided. Furthermore, by limiting the upper limit of the minimum distance c between the peripheral grooves and the vent hole at the edge of the body on the plane of the body, sufficient opening area of ​​the explosion-proof valve can be ensured, preventing the vent hole opening from being too large.

[0020] In one alternative embodiment, the height difference between the groove surface and the overlap portion in the direction perpendicular to the overlap portion is d1, and satisfies 0.15mm≤d1≤0.2mm.

[0021] Beneficial effects: By limiting the lower limit of the height difference d1 between the groove surface and the overlap, the smooth opening of the explosion-proof valve can be ensured, avoiding opening difficulties caused by an excessively thick groove surface. Simultaneously, the welding requirements between the overlap and the body are met, avoiding welding difficulties caused by an excessively thin overlap. Furthermore, by limiting the upper limit of the height difference d1 between the groove surface and the overlap, material accumulation at the overlap can be avoided due to excessive differences between the two planes, preventing excessive density from affecting product performance.

[0022] In one alternative embodiment, peripheral grooves are continuously provided on the outer periphery of the groove surface.

[0023] In one optional implementation, the battery dimensions satisfy the following: battery length ranges from 100mm to 600mm, battery width ranges from 50mm to 250mm, and battery height ranges from 10mm to 100mm; or, the battery dimensions satisfy the following: battery length ranges from 600mm to 1500mm, battery width ranges from 50mm to 250mm, and battery height ranges from 10mm to 100mm.

[0024] The interior of the main body is enclosed to form a sealed cavity, and an electrode assembly is installed inside the sealed cavity.

[0025] In one alternative embodiment, the peripheral groove formed by the recessed groove surface is formed by the recessed side of the groove surface facing away from the electrode assembly towards the electrode assembly.

[0026] In one alternative implementation, the peripheral grooves formed by the recessed groove surface are formed by the recessed side of the groove surface near the electrode group in the direction away from the electrode group. Attached Figure Description

[0027] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the battery of this utility model;

[0029] Figure 2 For the battery of this utility model in Figure 1 A schematic diagram of the fit between the shell and the AA section view;

[0030] Figure 3 for Figure 2 Enlarged view of point B in the middle;

[0031] Figure 4This is a schematic diagram of one type of explosion-proof valve according to the present invention;

[0032] Figure 5 for Figure 4 A schematic diagram of the CC section;

[0033] Figure 6 for Figure 5 Enlarged view of point D in the middle;

[0034] Figure 7 for Figure 5 Enlarged view at point E in the middle;

[0035] Figure 8 This is a schematic diagram of another explosion-proof valve according to the present invention;

[0036] Figure 9 For the battery of this utility model in Figure 1 A schematic diagram of the fit between the FF cross-section view and the housing;

[0037] Figure 10 Another type of battery of this utility model Figure 1 A schematic diagram of the fit between the FF cross-section view and the housing;

[0038] Figure 11 This utility model provides another type of battery. Figure 1 A schematic diagram of the fit between the FF cross-section view and the housing;

[0039] Figure 12 This is a schematic diagram of the explosion-proof valve of this utility model formed in the housing;

[0040] Figure 13 This is an example diagram of the explosion-proof valve of this utility model after it bursts open along the peripheral grooves.

[0041] Explanation of reference numerals in the attached figures:

[0042] 1. Body; 11. Injection hole; 12. Vent hole; 2. Explosion-proof valve; 21. Overlapping edge; 22. Peripheral grooves; 23. Groove surface; 24. Overlapping groove area; 25. Reinforcing rib grooves; 26. Compacted part; 3. Shell. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0044] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0045] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0046] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0047] The following is combined with Figures 1 to 9 The following describes embodiments of the present invention.

[0048] According to an embodiment of the present invention, a battery is provided, comprising:

[0049] The main body 1 has an exhaust hole 12, and a receiving groove is formed in the area of ​​the main body 1 corresponding to the exhaust hole 12.

[0050] Explosion-proof valve 2 is installed in the receiving tank;

[0051] On a plane parallel to the body 1, the minimum distance between the weld mark formed by welding the explosion-proof valve 2 and the receiving groove and the edge of the body 1 is f, and f ≥ 4 mm.

[0052] The receiving groove is suitable for accommodating the explosion-proof valve and is sealed by welding the overlapping part 21 to the body 1.

[0053] The battery provided in this embodiment of the present invention reduces the impact of the cell manufacturing process on the explosion-proof valve by ensuring that the minimum distance between the weld mark formed by welding the explosion-proof valve and the receiving groove and the edge of the body 1 is greater than or equal to 4mm. For example, operations such as welding around the shell cover can reduce the impact of the explosion-proof valve on the cell manufacturing process. This ensures the balanced force on the explosion-proof valve, reduces the impact of external forces on the explosion-proof valve, and makes the opening conditions of the explosion-proof valve precise and controllable.

[0054] In some embodiments, combined with Figure 3 As shown, in the plane perpendicular to the body 1, the depth of the receiving groove is a1, and the thickness of the overlap of the explosion-proof valve is d0; the explosion-proof valve is received in the receiving groove and satisfies: 0mm≤a1-d0≤0.2mm;

[0055] The value of a1 is in the range of 0.5mm≤a1≤0.6mm.

[0056] By ensuring that the depth a1 of the receiving groove is greater than the thickness d0 of the overlap of the explosion-proof valve, it is possible to ensure that the receiving groove completely accommodates the explosion-proof valve, thus ensuring smooth assembly and welding of the explosion-proof valve and the aluminum plate. If the height difference between the two is less than 0 mm, the explosion-proof valve may protrude from the body 1, which may cause wear to the explosion-proof valve. If the height difference between the two is greater than 0.2 mm, it may lead to poor welding when welding the explosion-proof valve to the body 1.

[0057] In this embodiment, the thickness d0 of the overlap portion of the explosion-proof valve can be in the range of 0.4mm≤d0≤0.6mm.

[0058] In the direction parallel to the groove surface 23, the width L1 of the overlap 21 is in the range of 2mm≤L1≤3mm. If it is less than 2mm, it will be not conducive to the stamping of the explosion-proof valve and subsequent welding with the aluminum plate. If it is greater than 3mm, it will cause a waste of area, and the effective opening area of ​​the explosion-proof valve will be lost within the limited area of ​​the explosion-proof valve.

[0059] The effective opening area of ​​the explosion-proof valve is the area defined by the internal region of the peripheral notch 22.

[0060] In some embodiments, the explosion-proof valve 2 includes:

[0061] The grooved surface 23 and the overlapping portion 21 surrounding the circumferential edge of the grooved surface 23;

[0062] At least a portion of the grooved surface 23 near the overlapping edge 21 is recessed to form peripheral grooves 22;

[0063] The groove surface 23 is also formed with reinforcing rib marks 25. The reinforcing rib marks 25 are located on the side of the peripheral marks 22 away from the overlapping portion 21, and in the direction perpendicular to the groove surface 23, the projections of the reinforcing rib marks 25 and the peripheral marks 22 do not overlap.

[0064] In the direction perpendicular to the groove surface 23, the residual thickness of the peripheral groove 22 is d2, and the residual thickness of the reinforcing rib groove 25 is d3, satisfying: 30μm≤d3-d2≤100μm.

[0065] In this embodiment, the thickness of the grooved surface 23 is less than the thickness of the overlapping portion 21. The overlapping portion 21 is used for welding to the body 1 to fix the explosion-proof valve to the body 1. The overlapping portion 21, by having a larger thickness, can meet the welding requirements. The grooved surface 23, by having a smaller thickness, can ensure the sealing requirements of the battery under normal use, and on the other hand, can ensure smooth bursting under pressure, facilitating venting.

[0066] By recessing at least a portion of the groove surface 23 near the overlap portion 21 to form peripheral grooves 22, the local thinning of peripheral grooves 22 can form a path guide for opening the groove surface 23, making it convenient for the explosion-proof valve to open according to the path of peripheral grooves 22.

[0067] Combination Figure 13 As shown, the explosion-proof valve can burst open along the peripheral grooves, using the guide path formed by the peripheral grooves 22 as the opening path. After opening, it ensures a sufficiently large opening area to guarantee the venting area of ​​the explosion-proof valve. Simultaneously, by ensuring that the minimum distance between the weld mark formed by welding the explosion-proof valve to the receiving groove and the edge of the body 1 is greater than or equal to 4mm, the impact of the cell manufacturing process on the explosion-proof valve can be reduced, thereby ensuring the balanced force on the explosion-proof valve, reducing the impact of external forces on the explosion-proof valve, and making the opening conditions of the explosion-proof valve precisely controllable. Combined with... Figure 13 It can be seen that after opening, there are fewer burrs on the opening path formed by the original surrounding engravings 22, and the opening is relatively smooth.

[0068] Since the groove surface 23 is thin and has a large area, the reinforcing ribs 25 are also formed on the groove surface 23. The reinforcing ribs 25 are located on the side of the peripheral ribs 22 away from the overlap 21. This can enhance the structural strength of the groove surface 23, reduce the deformation of the groove surface 23 in normal use, and ensure structural strength.

[0069] The explosion-proof valve provided in this embodiment of the invention has peripheral grooves 22 recessed in at least a portion of the groove surface 23 near the overlap portion 21, and reinforcing rib grooves 25 formed on the side of the groove surface 23 away from the overlap portion 21. By making the residual thickness d2 of the peripheral grooves 22 smaller than the residual thickness d3 of the reinforcing rib grooves 25, it can be ensured that the explosion-proof valve will preferentially burst through the path defined by the peripheral grooves 22 in the event of thermal runaway, thereby ensuring the exhaust area of ​​the explosion-proof valve. At the same time, the reinforcing rib grooves 25 can enhance the structural strength of the groove surface 23 and reduce the deformation of the groove surface 23 under normal use.

[0070] Furthermore, by limiting the upper and lower limits of the difference between the residual thickness d3 of the reinforcing rib notch 25 and the residual thickness d2 of the surrounding notch 22, the opening conditions of the explosion-proof valve can be precisely controlled, adapted to the battery cell manufacturing process, meet the opening requirements of specific working conditions, improve safety, avoid premature opening of the explosion-proof valve when the pressure is low, and avoid excessive injection pressure caused by delayed opening of the explosion-proof valve when the pressure is too high.

[0071] Optionally, the peripheral groove 22 surrounds the groove surface 23 near the edge 21, so that when the explosion-proof valve opens along the peripheral groove 22, it can ensure that the explosion-proof valve opens with a sufficient exhaust area.

[0072] If the remaining thickness d2 of the peripheral groove 22 is greater than the remaining thickness d3 of the reinforcing rib groove 25, the position of the reinforcing rib groove 25 is likely to be a weak point under stress, causing the explosion-proof valve to open along the path of the reinforcing rib groove 25, resulting in a small opening area and the reinforcing rib groove 25 failing to effectively play a reinforcing role.

[0073] In some embodiments, combined with Figure 6 , Figure 7 As shown, the residual thickness d2 of the peripheral scratch 22 ranges from 60μm to 180μm.

[0074] The range of the residual thickness d3 of the reinforcing rib notch 25 is: 120μm≤d3≤180μm.

[0075] Optionally, the residual thickness d2 of the peripheral notch 22 can be 60μm, 70μm, 90μm, 100μm, 120μm, 140μm, 160μm, 170μm, or 180μm, etc.

[0076] Optionally, the residual thickness d3 of the reinforcing rib notch 25 can be 120μm, 140μm, 160μm, 170μm, or 180μm, etc.

[0077] In some embodiments, combined with Figure 3 As shown, on the plane perpendicular to the body 1, the peripheral groove 22 is located within the projection range of the exhaust hole 12; and on the plane parallel to the body 1, the minimum distance between the peripheral groove 22 and the exhaust hole 12 at the edge of the body 1 is c, and satisfies: 1mm≤c≤3mm.

[0078] Since the peripheral groove 22 is located within the projection range of the vent hole 12, when the explosion-proof valve opens along the peripheral groove 22, interference of the vent hole 12 with the opening area of ​​the groove surface 23 can be avoided.

[0079] Meanwhile, by limiting the minimum distance c between the peripheral groove 22 and the vent hole 12 on the edge of the body 1 to the plane parallel to the body, interference of the vent hole 12 with the opening area of ​​the groove surface 23 can be avoided. And by limiting the minimum distance c between the peripheral groove 22 and the vent hole 12 on the edge of the body 1 to the plane parallel to the body, the explosion-proof valve can be guaranteed to have a sufficient opening area, thus avoiding the vent hole 12 from being too large.

[0080] In some embodiments, combined with Figure 6 As shown, in the direction perpendicular to the overlap portion 21, the height difference between the groove surface 23 and the overlap portion 21 is d1, and satisfies 0.15mm≤d1≤0.35mm.

[0081] By limiting the lower limit of the height difference d1 between the groove surface 23 and the overlapping portion 21, the smooth opening of the explosion-proof valve can be ensured, avoiding opening difficulties caused by an excessively thick groove surface 23. Simultaneously, the welding requirements between the overlapping portion 21 and the body 1 are met, avoiding welding difficulties caused by an excessively thin overlapping portion 21. Furthermore, by limiting the upper limit of the height difference d1 between the groove surface 23 and the overlapping portion 21, material accumulation in the overlapping portion 21 caused by excessive differences between the two planes can be avoided, preventing excessive density from affecting product performance.

[0082] Optionally, the height difference d1 between the groove surface 23 and the overlapping edge 21 can be 0.15mm, 0.16mm, 0.17mm, 0.18mm, or 0.19mm, etc.

[0083] In some embodiments, peripheral grooves 22 are continuously provided on the outer periphery of the groove surface 23.

[0084] Furthermore, in combination Figure 4 As shown, the peripheral grooves 22 are continuously and non-closedly arranged on the outer periphery of the groove surface 23, and the groove surface 23 forms a compacted portion 26 in the area adjacent to the overlapping portion 21 where no peripheral grooves 22 are provided.

[0085] Optionally, the overlap portion 21 of the explosion-proof valve is constructed as a racetrack-shaped structure, wherein the racetrack-shaped structure includes straight segments arranged parallel to each other on both sides of the explosion-proof valve along the width direction, and arc segments arranged at both ends of the straight segments along the length direction.

[0086] The groove surface 23 is continuously provided inside the overlapping part 21.

[0087] In this embodiment, the compaction part 26 corresponds to one of the straight segments of the runway-shaped structure, and the length of the compaction part 26 is Z, and Z satisfies: Z = Y - (4mm ~ 6mm), where Y is the distance between the centers of the two semicircles of the arc segments at both ends of the straight segment length direction.

[0088] By continuously and non-closedly setting the peripheral grooves 22 on the outer periphery of the groove surface 23, a compaction part 26 is formed in the area adjacent to the overlap portion 21 where no peripheral grooves 22 are provided. This allows the explosion-proof valve to burst open along the path formed by the peripheral grooves 22 when it is under pressure. The bursting groove surface 23 remains connected to the overlap portion 21 through the compaction part 26. While ensuring the opening area of ​​the explosion-proof valve, it can prevent the bursting groove surface 23 from flying out, preventing damage to other external structures when the bursting groove surface 23 moves at high speed. At the same time, it can prevent the flying groove surface 23 from blocking the explosion-proof valves of other batteries, preventing accidental overlap from causing a short circuit.

[0089] In some embodiments, combined with Figure 4 As shown, the reinforcing rib notch 25 includes at least two arc-shaped notches, the two ends of which intersect with the surrounding notches 22, and at least two arc-shaped notches partially overlap to form a notch overlap area 24.

[0090] In this embodiment, the two ends of the reinforcing rib groove 25 are taken as the starting point at the intersection of the straight segment and the arc segment of the racetrack-shaped structure. Two reinforcing rib grooves 25 are formed on the groove surface 23, and the two reinforcing rib grooves 25 are symmetrically arranged relative to the central axis of the explosion-proof valve along the length direction.

[0091] By forming the overlapping area 24 of the grooves at the junction of the two reinforcing rib grooves 25, the area in the middle of the groove surface 23 that is most prone to deformation can be reinforced, thereby reducing the amount of deformation.

[0092] Referring to Table 1 below, the opening effect of the explosion-proof valve provided in the embodiments of this utility model is verified through several sets of test examples.

[0093] Example 1: The burst pressure of the explosion-proof valve on the cell cover is 0.9±0.2Mpa, the welding edge distance f of the explosion-proof valve is 4mm, and after the cover is welded, the finished cell is subjected to a burst test, and the burst pressure is 0.952Mpa.

[0094] Example 2: The burst pressure of the explosion-proof valve on the cell cover is 0.9±0.2Mpa, the welding edge distance f of the explosion-proof valve is 6mm, and after the cover is welded, the finished cell is subjected to a burst test, and the burst pressure is 0.945Mpa.

[0095] Example 3: The burst pressure of the explosion-proof valve on the battery cell cover is 0.9±0.2 MPa, and the welding edge distance f of the explosion-proof valve is 6 mm. After welding the cover, the finished battery cell is subjected to a large-area extrusion vibration test, and the leakage rate of the explosion-proof valve is tested. The helium leak detection rate is 6.0×10⁻⁶. - 8 pa.m 3 / s; standard (1×10 -7 pa.m 3 / s)

[0096] Comparative Example 1: The burst pressure of the explosion-proof valve on the cell cover is 0.9±0.2Mpa, the welding edge distance f of the explosion-proof valve is 3mm, and after the cover is welded, the finished cell is subjected to a burst test, and the burst pressure is 0.686Mpa (unqualified).

[0097] Comparative Example 2: The burst pressure of the explosion-proof valve on the cell cover is 0.9±0.2Mpa, the welding edge distance f of the explosion-proof valve is 2.5mm, and after the cover is welded, the finished cell is subjected to a burst test, and the burst pressure is 0.635Mpa (unqualified).

[0098] Comparative Example 3: The burst pressure of the explosion-proof valve on the cell cover was 0.9 ± 0.2 MPa, and the welding edge distance f of the explosion-proof valve was 2.5 mm. After welding the cover, the finished cell underwent a large-area extrusion vibration test, and the leakage rate of the explosion-proof valve was tested. The helium leak detection rate was 7.0 × 10⁻⁶. - 7 pa.m 3 / s; standard (1×10 -7 pa.m 3 / s).

[0099] The material systems for battery cells include various types, such as lithium iron phosphate (LFP), ternary lithium (NCM), lithium manganese iron phosphate, cobalt-free systems, and sodium batteries. Different cell systems correspond to different explosion-proof valve burst pressures. For example, the explosion-proof valve burst pressure range for LFP is 0.4 MPa-0.8 MPa; for NCM, it is 0.7 MPa-1.2 MPa; for cobalt-free systems, it is 0.8 MPa-1.2 MPa; and for sodium batteries, it is 0.7 MPa-1.1 MPa. Furthermore, the explosion-proof valve burst pressure range for semi-solid-state / all-solid-state batteries is 0.7 MPa-1.2 MPa. This patent defines and protects parameters based on the size and shape of the explosion-proof valve, but is not limited to any particular system.

[0100] Table 1

[0101]

[0102] In some embodiments, the battery dimensions satisfy the following: battery length ranges from 100mm to 600mm, battery width ranges from 50mm to 250mm, and battery height ranges from 10mm to 100mm; or, the battery dimensions satisfy the following: battery length ranges from 600mm to 1500mm, battery width ranges from 50mm to 250mm, and battery height ranges from 10mm to 100mm; a sealed cavity is formed inside the main body, and an electrode assembly is disposed within the sealed cavity.

[0103] Optional, combined Figure 3As shown, the thickness a0 of the shell ranges from 1.0mm ≤ a0 ≤ 1.5mm. To meet welding and shell strength requirements, the depth a1 of the corresponding fitting groove ranges from 0.5mm ≤ a1 ≤ 0.6mm.

[0104] In some embodiments, combined with Figure 9 As shown, the receiving groove formed on the body 1 is formed by the recess of the side of the body 1 close to the pole group, and the peripheral groove 22 formed by the recess of the groove surface 23 is formed by the recess of the groove surface 23 away from the pole group towards the pole group.

[0105] In other embodiments, combined with Figure 10 As shown, the receiving groove formed on the body 1 is formed by the recess of the side of the body 1 away from the electrode group, and the peripheral groove 22 formed by the recess of the groove surface 23 is formed by the recess of the groove surface 23 near the electrode group towards the direction away from the electrode group.

[0106] In other embodiments, combined with Figure 11 As shown, the receiving groove formed on the body 1 is formed by the recess of the side of the body 1 away from the electrode group, and the peripheral groove 22 formed by the recess of the groove surface 23 is formed by the recess of the groove surface 23 towards the electrode group.

[0107] In other embodiments, combined with Figure 12 As shown, a vent 12 is provided on the battery casing 3, and a receiving groove is formed in the area of ​​the casing 3 corresponding to the vent 12. The explosion-proof valve 2 is fixedly connected to the casing 3. It should be noted that the vent 12 can be provided on the battery casing 3 or on the battery itself. Correspondingly, the explosion-proof valve 2 can be provided on the battery casing 3 or on the battery itself, as long as the venting and pressure relief requirements are met.

[0108] The explosion-proof valve with the peripheral grooves 22 can be installed facing inwards towards the housing; alternatively, it can also be installed facing outwards towards the housing. When installed with the grooves facing inwards, external contact can effectively prevent damage to the grooves, but there is a risk of electrolyte corrosion leading to a decrease in detonation pressure (it's worth noting that the electrolyte only produces hydrofluoric acid (HF) in a water-based environment, and HF can corrode the residual material). When installed with the grooves facing outwards, electrolyte corrosion of the grooves within the battery cell can be avoided, but there is a risk of interference with the grooved surface, requiring an additional explosion-proof valve protection plate. This introduces a bottom flatness issue, resulting in an uneven bottom of the battery cell.

[0109] Obviously, the above embodiments are merely examples for clear illustration and are not intended to limit the implementation. Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and all such modifications and variations fall within the scope defined by the present invention.

Claims

1. A battery, characterized in that, include: The body has an exhaust hole, and a receiving groove is formed in the area of ​​the body corresponding to the exhaust hole. An explosion-proof valve is installed inside the receiving groove; On a plane parallel to the body, the minimum distance between the weld mark formed by welding the explosion-proof valve and the receiving groove and the edge of the body is f, and f ≥ 4 mm.

2. The battery according to claim 1, characterized in that, In a plane perpendicular to the body, the depth of the receiving groove is a1, and the thickness of the overlap of the explosion-proof valve is d0; the explosion-proof valve is received in the receiving groove and satisfies: 0mm≤a1-d0≤0.2mm; The value of d0 is 0.4mm≤d0≤0.6mm; the value of a1 is 0.5mm≤a1≤0.6mm.

3. The battery according to claim 1, characterized in that, The explosion-proof valve includes: The grooved surface and the overlapping portion surrounding the circumferential edge of the grooved surface; At least a portion of the grooved surface near the overlapping edge is recessed and has peripheral grooves.

4. The battery according to claim 3, characterized in that, The residual thickness d2 of the peripheral groove has a range of 90μm≤d2≤160μm.

5. The battery according to claim 3, characterized in that, In a plane perpendicular to the body, the peripheral groove is located within the projection range of the vent hole; and in a plane parallel to the body, the minimum distance between the peripheral groove and the vent hole at the edge of the body is c, and satisfies: 1mm≤c≤3mm.

6. The battery according to claim 3, characterized in that, In the direction perpendicular to the overlapping portion, the height difference between the groove surface and the overlapping portion is d1, and satisfies 0.15mm≤d1≤0.2mm.

7. The battery according to any one of claims 3 to 6, characterized in that, The peripheral grooves are continuously provided on the outer periphery of the groove surface.

8. The battery according to any one of claims 1 to 6, characterized in that, The dimensions of the battery satisfy the following conditions: the battery length ranges from 100mm to 600mm, the battery width ranges from 50mm to 250mm, and the battery height ranges from 10mm to 100mm; or, the dimensions of the battery satisfy the following conditions: the battery length ranges from 600mm to 1500mm, the battery width ranges from 50mm to 250mm, and the battery height ranges from 10mm to 100mm. The body is enclosed to form a sealed cavity, and an electrode assembly is disposed within the sealed cavity.

9. The battery according to claim 8, characterized in that, The peripheral grooves formed by the recessed groove surface are formed by the side of the groove surface away from the electrode group and recessed towards the electrode group.

10. The battery according to claim 8, characterized in that, The peripheral grooves formed by the recessed groove surface are formed by the recessed side of the groove surface near the electrode group in a direction away from the electrode group.

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