Battery cover plate assembly, battery and battery pack

Abstract

The utility model relates to battery technology field, concretely relates to battery cover plate subassembly, battery and battery pack, this battery cover plate subassembly includes: cover plate body, set up with mounting hole, the explosion -proof sheet is set up in the mounting hole, and completely covers the mounting hole, the one end of convex is connected cover plate body and sets up in the side away from the explosion -proof sheet, and along perpendicular to the direction of cover plate body, convex extension setting forms side wall and bottom wall, and the projection of convex and explosion -proof sheet at least partly coincides, at least in bottom wall / side wall set up with pressure -relief hole, the buffer cavity is surrounded by side wall, bottom wall and explosion -proof sheet and forms. In this embodiment, by setting up convex, can form effective rigid support to cover plate body, thereby can effectively improve the anti -deformation ability of cover plate body, solved the problem that the welding area of cover plate matrix was easy to crack because of pressure vibration when heat runaway, reduced heat runaway safety risk.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to battery cover assembly, battery and battery pack. Background Technology

[0002] Currently, the safety issues of power batteries are becoming increasingly prominent. Battery thermal runaway is one of the main causes of safety accidents. If the high-temperature, high-pressure gases generated during this process cannot be discharged in a timely and stable manner, it will lead to battery casing rupture or even explosion. Especially with the increasing demand for battery energy density and charging rate, a large amount of high-temperature gas is generated inside the battery during thermal runaway, posing a safety risk of abnormal pressure leakage. Utility Model Content

[0003] Abnormal pressure relief in batteries is mainly caused by the weak weld strength between the battery cover and the explosion-proof valve after gas is generated inside the battery. During thermal runaway, high-temperature and high-pressure substances impact the weld wire, causing it to crack. This increases the pressure relief area of ​​the battery, preventing the ejected substances from dissipating in time and affecting the safety of surrounding batteries. Therefore, this invention provides a battery cover assembly, a battery, and a battery pack to solve the problem of insufficient strength of the cover substrate around the explosion-proof valve.

[0004] In a first aspect, the present invention provides a battery cover assembly, the battery cover assembly comprising: The cover plate body has mounting holes; An explosion-proof sheet is installed in the mounting hole and completely covers the mounting hole; the explosion-proof sheet is used to release pressure when the internal pressure of the battery reaches a certain level. A protrusion is provided, one end of which is connected to the cover plate body and is located on the side away from the explosion-proof sheet; the protrusion extends in a direction perpendicular to the cover plate body to form a side wall and a bottom wall; the projection of the protrusion at least partially overlaps with that of the explosion-proof sheet; and a pressure relief hole is provided at least on the bottom wall. The buffer cavity is formed by the side wall, the bottom wall, and the explosion-proof sheet.

[0005] Beneficial effects: In this embodiment, by setting the protrusion, an effective rigid support can be formed for the cover plate body, thereby effectively improving the deformation resistance of the cover plate body and solving the problem that the insufficient strength of the cover plate base makes the welded area of ​​the cover plate base prone to cracking due to pressure vibration during thermal runaway. Furthermore, by at least partially aligning the projection of the protrusion with the explosion-proof plate, the explosion-proof plate can be physically shielded, reducing direct damage to the explosion-proof plate from external impacts without affecting the normal pressure relief of the explosion-proof plate. At the same time, the sidewalls and bottom walls of the protrusion and the explosion-proof plate surround and form a buffer cavity, providing a buffer space for the high-temperature and high-pressure substances generated during thermal runaway, preventing the high-temperature and high-pressure substances from being directly sprayed outward and damaging the cover plate around the explosion-proof valve, thereby ensuring that the explosion-proof plate opens stably at the preset pressure and reducing the safety risk of thermal runaway.

[0006] Secondly, the present invention also provides a battery comprising: a housing and a battery cell disposed in the housing, wherein the housing is provided with a battery cover assembly as described in any of the above embodiments.

[0007] Thirdly, the present invention also provides a battery pack comprising the battery as described in any of the above embodiments. Attached Figure Description

[0008] To more clearly illustrate the technical solutions in the specific embodiments or related technologies of this utility model, the drawings used in the description of the specific embodiments or related technologies 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.

[0009] Figure 1 This is a front structural diagram of the cover plate structure with an explosion-proof sheet in an embodiment of the present utility model. Figure 2 This is a front view of the cover plate structure without the explosion-proof sheet in this embodiment of the utility model; Figure 3 This is a schematic diagram of the back structure of the cover plate in an embodiment of this utility model; Figure 4 This is an enlarged schematic diagram of the back of the cover plate structure in an embodiment of this utility model; Figure 5 This is a cross-sectional view along the length of the cover plate body in an embodiment of the present utility model; Figure 6 for Figure 5 An enlarged diagram in Part A; Figure 7 for Figure 6 A schematic diagram of a portion of the structural markings; Figure 8 for Figure 6 A schematic diagram of another part of the structural markings.

[0010] Explanation of reference numerals in the attached figures: 1. Cover plate body; 11. Mounting hole; 12. Recess; 13. Boss; 2. Explosion-proof sheet; 21. Score; 3. Protrusion; 31. Bottom wall; 32. Side wall; 33. First step; 34. Groove; 4. Buffer cavity; 5. Insulation layer; 6. Solder wire. Detailed Implementation

[0011] 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.

[0012] 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., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used for the convenience of describing this utility model and for 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. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes and should not be construed as indicating or implying relative importance.

[0013] 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; they can also refer to the internal connection of two components; and they can refer to a wireless connection or a wired connection. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0014] 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.

[0015] Currently, the safety issues of power batteries are becoming increasingly prominent. Battery thermal runaway is one of the main causes of safety accidents. If the high-temperature and high-pressure gases generated during this process cannot be discharged in a timely and stable manner, it will lead to the rupture of the battery casing or even an explosion.

[0016] Especially with the increasing demand for battery energy density and charging rate, a large amount of high-temperature gas is generated inside the battery during thermal runaway, posing a safety risk of abnormal pressure leakage.

[0017] Typically, technicians install an explosion-proof valve on the battery, with a notched area (21) on it. This allows the valve to be triggered by pressure applied to the notched area. However, the cover plate around the explosion-proof valve has insufficient strength, making the welded areas prone to cracking due to pressure and vibration during thermal runaway, posing a certain safety risk.

[0018] In view of this, the present invention provides a battery cover assembly, a battery, and a battery pack to solve the problem of insufficient strength of the cover substrate around the explosion-proof valve.

[0019] The following is combined with Figures 1 to 8 The following describes embodiments of the present invention.

[0020] According to an embodiment of the present invention, in one aspect, a battery cover assembly is provided, the battery cover assembly comprising: Specifically, in this embodiment, the cover plate body 1 has a mounting hole 11. The shape of the mounting hole 11 can be circular, circular-rectangular, rectangular, or even an elliptical structure resembling a racetrack. Of course, this embodiment is merely an example of the shape of the mounting hole 11, and is not intended to limit it. Those skilled in the art can modify it according to actual conditions, as long as the same technical effect is achieved. Furthermore, the cover plate body 1 is a component that seals the opening of the battery casing to isolate the internal environment of the battery cell from the external environment. The material of the cover plate body 1 includes, but is not limited to, copper, iron, aluminum, stainless steel, and aluminum alloy. Those skilled in the art can modify the material of the cover plate body 1 according to actual conditions, as long as the same technical effect is achieved.

[0021] Furthermore, in this embodiment, the explosion-proof sheet 2 is disposed in the mounting hole 11 and completely covers the mounting hole 11. The explosion-proof sheet 2 is used to release pressure when the internal pressure of the battery reaches a certain level. The explosion-proof sheet 2 can be connected to the wall of the mounting hole 11 by welding, although other connection methods can also be used; this embodiment is merely illustrative. Furthermore, the material of the explosion-proof sheet 2 is not limited, including but not limited to aluminum, steel, alloys, etc. Those skilled in the art can change the material of the explosion-proof sheet 2 according to actual conditions, as long as the same technical effect is achieved.

[0022] Furthermore, in this embodiment, one end of the protrusion 3 is connected to the cover plate body 1 and is located on the side away from the explosion-proof sheet 2, that is, the side of the cover plate body 1 facing the battery cell. Additionally, the protrusion 3 extends downwards by a certain length in a direction perpendicular to the cover plate body 1, that is, it extends a certain length away from the explosion-proof sheet 2, forming a side wall 32 and a bottom wall 31. This ensures that after the cover plate structure is installed on the battery device casing, the protrusion 3 abuts against the battery cell inside the casing, thereby creating a certain distance between the cover plate body 1 and the battery cell. Furthermore, the material of the protrusion 3 includes, but is not limited to, one or more of the following materials: stainless steel, aluminum alloy, nickel-based alloy, and titanium alloy. Those skilled in the art can change the material of the protrusion 3 according to actual conditions, as long as the same technical effect is achieved.

[0023] Of course, the protrusion 3 and the cover plate body 1 can be integrally formed or separately formed. When the protrusion 3 and the cover plate body 1 are separately formed, they can be connected by welding, bonding, or riveting. Of course, this embodiment is only an example of how the protrusion 3 and the cover plate body 1 can be set, but it is not a limitation. Those skilled in the art can make changes according to the actual situation, as long as the same technical effect can be achieved.

[0024] Furthermore, the projections of the protrusion 3 and the explosion-proof sheet 2 at least partially overlap. That is, at least a portion of the structure of the protrusion 3 is directly opposite the explosion-proof sheet 2, or multiple protrusions 3 may be provided, with one or two protrusions 3 directly opposite the explosion-proof sheet 2. They can also be evenly distributed on the inner side of the cover plate body 1, or distributed in a localized area on the inner side of the cover plate body 1, or only in the area near the explosion-proof sheet 2. Of course, this embodiment is merely an example of how the protrusions 3 can be arranged, but it is not intended to limit the scope. Those skilled in the art can modify the arrangement according to actual conditions, as long as the same technical effect is achieved.

[0025] Furthermore, pressure relief holes are provided on both the bottom wall 31 and the side wall 32 of the protrusion 3. Of course, pressure relief holes may be provided only on the bottom wall 31 or the side wall 32 of the protrusion 3. This embodiment is merely an example and is not intended to limit the scope. Those skilled in the art can make changes according to the actual situation, as long as the same technical effect can be achieved.

[0026] Furthermore, the buffer cavity 4 is formed by the side wall 32, the bottom wall 31, and the explosion-proof sheet 2. That is, one of the protrusions 3 is directly opposite the explosion-proof sheet 2, and the side wall 32 of the protrusion 3 is located circumferentially around the edge of the explosion-proof sheet 2, while the bottom wall 31 corresponds to the explosion-proof sheet 2, thereby forming the buffer cavity 4. Since the bottom wall 31 and the side wall 32 of the protrusion 3 are provided with pressure relief holes, the gaseous and liquid substances generated during thermal runaway can enter the buffer cavity 4 for buffering.

[0027] The shape of the buffer cavity 4 can be rectangular or cylindrical. Of course, this embodiment is merely an example and is not intended to limit the design. Those skilled in the art can modify it according to actual circumstances to achieve the same technical effect.

[0028] In this embodiment, the protrusion 3 provides effective rigid support for the cover plate body 1, thereby significantly improving its resistance to deformation. This solves the problem of insufficient strength in the cover plate substrate, which makes the welded areas of the cover plate substrate prone to cracking due to pressure vibration during thermal runaway. Furthermore, by at least partially overlapping the projection of the protrusion 3 with that of the explosion-proof plate 2, the explosion-proof plate 2 can be physically shielded, reducing direct damage from external impacts without affecting its normal pressure relief. Simultaneously, the sidewall 32, bottom wall 31 of the protrusion 3, and the explosion-proof plate 2 together form a buffer cavity 4, providing a buffer space for the high-temperature, high-pressure substances generated during thermal runaway. This prevents the high-temperature, high-pressure substances from directly spraying outwards and damaging the cover plate around the explosion-proof valve, ensuring that the explosion-proof plate 2 opens stably at a preset pressure and reducing the safety risk of thermal runaway.

[0029] Furthermore, in an optional embodiment, the end face of the protrusion 3 away from the bottom wall 31 is provided with a stepped structure. The first step 33 of the stepped structure is used to install the explosion-proof sheet 2 and is connected to the bottom edge of the explosion-proof sheet 2. The connection between the first step 33 and the explosion-proof sheet 2 can be achieved by welding, bonding, or riveting. When welding is used, the welding can be done by butt welding or by welding through the explosion-proof sheet 2 and the stepped surface. When the explosion-proof sheet 2 is welded to the first step 33, a weld line 6 is formed. Of course, through welding is preferred to avoid the weld line 6 protruding from the cover plate body 1, which would affect the strength of the weld line 6 and the battery assembly efficiency. This embodiment is only an example of the connection method between the first step 33 and the explosion-proof sheet 2, but it is not a limitation. Those skilled in the art can make changes according to the actual situation, as long as the same technical effect is achieved.

[0030] In this embodiment, the stepped structure provides a clear installation position for the explosion-proof sheet 2, preventing its position from shifting and ensuring its pressure relief effect. Furthermore, during actual installation, the first step 33 can fit snugly against the bottom edge of the explosion-proof sheet 2, increasing the contact area and improving the tightness of the connection between the explosion-proof sheet 2 and the protrusion 3, thus reducing the risk of gas leakage from gaps.

[0031] Furthermore, in the event of thermal runaway of the battery, the stepped structure can effectively disperse the gas impact force during thermal runaway, thereby avoiding damage to the explosion-proof sheet 2 caused by local stress concentration, and thus improving the impact resistance of the overall structure of the explosion-proof valve.

[0032] Furthermore, in an optional embodiment, the bottom wall 31 of the first step 33 is welded to the explosion-proof sheet 2, so that the first step 33 can provide a certain support and abutment for the explosion-proof sheet 2, and to a certain extent, the stress generated on the explosion-proof sheet 2 can be dispersed to avoid stress concentration on the explosion-proof sheet 2.

[0033] Furthermore, in an optional embodiment, along the first direction, the height of the first step 33 is L1mm, satisfying 0.5mm≤L1mm≤1mm, and the width of the first step 33 is L2mm, satisfying 0.5mm≤L2mm≤2.5mm.

[0034] For example, L1mm can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, etc. Of course, this embodiment is merely an example illustrating the specific numerical range of L1mm, but it is not intended to limit it. Those skilled in the art can modify it according to actual circumstances, as long as the same technical effect is achieved.

[0035] Similarly, L2mm can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, etc. Of course, this embodiment is merely an example illustrating the specific numerical range of L2mm, and does not impose any limitations on it. Those skilled in the art can modify it according to actual circumstances, as long as the same technical effect is achieved.

[0036] Furthermore, in this embodiment, the height of the first step 33 can be set to L1mm and the width of the first step 33 can be set to L2mm at the same time, or only the height of the first step 33 can be set to L1mm, or the width of the first step 33 can be set to L2mm. Those skilled in the art can make changes according to the actual situation.

[0037] In this embodiment, the height and width of the first step 33 are limited to a certain range, which improves the overall strength of the cover plate while preventing short circuits. If L1 is too large, the protrusion 3 may be too close to the battery cell, easily leading to a short circuit. If L1 is too small, the connection depth between the explosion-proof sheet 2 and the protrusion 3 is insufficient, reducing the overall strength of the step structure. Furthermore, in this embodiment, if L2 is too small, the contact area between the explosion-proof sheet 2 and the first step 33 is insufficient, and the connection between the two is prone to loosening during actual operation. If L2 is too large, it will occupy too much space, affecting the space utilization rate inside the battery.

[0038] Furthermore, in an optional embodiment, the edge of the explosion-proof sheet 2 is welded to the first step 33 to form a weld line 6. The depth of the weld line 6 is L3mm in the vertical direction and L4mm in the horizontal direction. The ratio of L3 to L1, L3 / L1, satisfies 0.45≤L3 / L1≤1; the ratio of L4 to L2, L4 / L2, satisfies 0.2≤L4 / L2≤1.

[0039] Furthermore, in this embodiment, the ratio L3 / L1 can simultaneously satisfy 0.45≤L3 / L1≤1, and the ratio L4 / L2 can simultaneously satisfy 0.2≤L4 / L2≤1. Alternatively, only the ratio L3 / L1 can satisfy 0.45≤L3 / L1≤1, and only the ratio L4 / L2 can satisfy 0.2≤L4 / L2≤1. Those skilled in the art can make changes according to the actual situation.

[0040] Furthermore, in this embodiment, the ratio L3 / L1 can be 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1, etc. Of course, this embodiment is merely an example illustrating the specific numerical range of the ratio L3 / L1, but it is not intended to limit the scope. Those skilled in the art can modify it according to actual circumstances, as long as the same technical effect is achieved.

[0041] Furthermore, in this embodiment, the ratio L4 / L2 can be 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1, etc. Of course, this embodiment is merely an example illustrating the specific numerical range of the ratio L4 / L2, and is not intended to limit it. Those skilled in the art can modify it according to actual circumstances, as long as the same technical effect is achieved.

[0042] Furthermore, in this embodiment, L3mm can be 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, 0.85mm, 0.9mm, 0.95mm, 1mm, etc. Of course, this embodiment is merely an example illustrating the specific numerical range of L3mm, and is not intended to limit it. Those skilled in the art can modify it according to actual circumstances, as long as the same technical effect is achieved.

[0043] Furthermore, in this embodiment, L4mm can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, etc. Of course, this embodiment is merely an example illustrating the specific numerical range of L4mm, but it does not impose limitations. Those skilled in the art can modify it according to actual circumstances, as long as the same technical effect is achieved.

[0044] In this embodiment, by limiting the ratios between the depth of the weld line 6 and the height of the first step 33, and between the width of the weld line 6 and the width of the first step 33, to a certain range, welding quality can be guaranteed, and the connection reliability between the explosion-proof sheet 2 and the protrusion 3 can be improved. If the ratio between the depth of the weld line 6 and the height of the first step 33 is too small, the welding depth will be insufficient, and incomplete welding may easily occur; if the ratio is too large, the step may be welded through, thereby affecting the structural strength. Therefore, a reasonable ratio can ensure a firm weld without damaging the step.

[0045] Furthermore, if the ratio between the width of the weld line 6 and the width of the first step 33 is too small, the welding area will be insufficient, thus affecting the welding strength and the overall structural strength. If the ratio between the width of the weld line 6 and the width of the first step 33 is too large, the weld line 6 may overflow the step, affecting the structural strength of the surrounding structure of the explosion-proof sheet 2. Therefore, a reasonable ratio can ensure welding strength without compromising the structural integrity of the explosion-proof sheet 2.

[0046] Furthermore, in an optional embodiment, the distance between the bottom of the welding line 6 and the bottom wall 31 in the vertical direction is L5mm, and the distance between the bottom of the explosion-proof sheet 2 and the bottom wall 31 is L6mm, where L5mm satisfies 0.5mm≤L5mm≤5mm, and / or L6mm satisfies 1mm≤L6mm≤6mm.

[0047] Furthermore, in this embodiment, L5mm can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, etc. Of course, this embodiment is merely an example illustrating the specific numerical range of L5mm, and does not impose any limitations on it. Those skilled in the art can modify it according to actual circumstances, as long as the same technical effect is achieved.

[0048] Furthermore, in this embodiment, L6mm can be 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, etc. Of course, this embodiment is merely an example illustrating the specific numerical range of L6mm, and does not impose any limitations. Those skilled in the art can modify it according to actual circumstances, as long as the same technical effect is achieved.

[0049] Furthermore, in this embodiment, 0.5mm≤L5mm≤5mm and 1mm≤L6mm≤6mm can be satisfied simultaneously, or only L5mm can satisfy 0.5mm≤L5mm≤5mm, or only L6mm can satisfy 1mm≤L6mm≤6mm. Those skilled in the art can make changes according to the actual situation.

[0050] In this embodiment, by limiting the distance between the bottom of the welding wire 6 and the bottom of the explosion-proof sheet 2 to a certain range, the effective volume of the buffer cavity 4 can be ensured, thus improving the pressure buffering effect. Since L5 and L6 directly determine the height of the buffer cavity 4, if the distance is too small, the volume of the buffer cavity 4 will be insufficient, failing to effectively buffer pressure, and the explosion-proof sheet 2 will easily rupture due to a sudden increase in pressure. If the distance is too large, the cavity will occupy too much space, affecting the space utilization rate inside the battery. Therefore, limiting the distance to a certain range balances the buffering effect and space requirements.

[0051] Furthermore, in an optional embodiment, the thickness of the bottom wall 31 is L7mm in the vertical direction, and the ratio L7 / L5 between L7 and L5 satisfies 0.2≤L7 / L5≤1.

[0052] Furthermore, in this embodiment, the ratio L7 / L5 can be 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1, etc. Of course, this embodiment is merely an example illustrating the specific numerical range of the ratio L7 / L5, and is not intended to limit it. Those skilled in the art can modify it according to actual circumstances, as long as the same technical effect is achieved.

[0053] Furthermore, in this embodiment, L7mm satisfies 0.5mm ≤ L7mm ≤ 2mm. For example, in this embodiment, L7mm can be 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, 0.85mm, 0.9mm, 0.95mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, etc. Of course, this embodiment is merely an example illustrating the specific numerical range of L7mm, but it does not limit it. Those skilled in the art can modify it according to actual circumstances, as long as the same technical effect is achieved.

[0054] In this embodiment, the ratio of the thickness of the bottom wall 31 to the distance between the welding line 6 and the bottom wall 31 is limited to a certain range, which can balance the structural strength of the bottom wall 31 and the buffering effect of the buffer cavity 4. If the ratio is too small, the thickness of the bottom wall 31 may be too small, resulting in insufficient structural strength. In the event of thermal runaway, the bottom wall 31 may be easily damaged by pressure or impact airflow. Alternatively, the distance between the welding line 6 and the bottom wall 31 may be too large, causing the cavity to occupy too much space and affecting the space utilization rate inside the battery. If the ratio is too large, the thickness of the bottom wall 31 may be too large, resulting in a large overall weight and volume of the protrusion 3, affecting the space utilization rate inside the battery. Alternatively, the distance between the welding line 6 and the bottom wall 31 may be too small, resulting in insufficient volume of the buffer cavity 4, which cannot effectively buffer pressure, and the explosion-proof sheet 2 may easily rupture due to a sudden increase in pressure.

[0055] Furthermore, in an optional embodiment, a groove 34 is provided on the bottom outer surface of the protrusion 3, and the groove 34 communicates with the buffer cavity 4.

[0056] In this embodiment, the outer surface of the bottom of the protrusion 3 is provided with a groove 34 that communicates with the buffer cavity 4. This allows the gas in the buffer cavity 4 to be quickly discharged through the groove 34, avoiding exhaust blockage caused by relying solely on the pressure relief hole on the bottom wall 31 for pressure relief. Furthermore, since the groove 34 is located on the bottom outer surface, it can guide the gas to be discharged directionally to the outside of the battery, reducing the impact on other components inside the battery.

[0057] Furthermore, in an optional embodiment, the depth of the groove 34 is L8mm in the vertical direction, and the ratio L8 / L5 between L8 and L5 satisfies 0.2≤L8 / L5≤0.8.

[0058] Furthermore, in this embodiment, the ratio L8 / L5 can be 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, etc. Of course, this embodiment is merely an example illustrating the specific numerical range of the ratio L8 / L5, but it is not intended to limit the scope. Those skilled in the art can modify it according to actual circumstances, as long as the same technical effect is achieved.

[0059] Furthermore, in this embodiment, L8mm satisfies 0.5mm ≤ L8mm ≤ 2mm. For example, in this embodiment, L8mm can be 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, 0.85mm, 0.9mm, 0.95mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, etc. Of course, this embodiment is merely an example illustrating the specific numerical range of L8mm, but it does not limit it. Those skilled in the art can modify it according to actual circumstances, as long as the same technical effect is achieved.

[0060] In this embodiment, the ratio of the depths L8 and L5 of the groove 34 is limited to a certain range, thus balancing the pressure relief capacity of the groove 34 with the structural strength of the bottom of the protrusion 3. If L8 is too small, the cross-section of the pressure relief channel will be insufficient, resulting in low exhaust efficiency. If L8 is too large, it will weaken the structural strength of the bottom of the protrusion 3, easily leading to deformation or breakage of the bottom. Therefore, limiting the ratio of the depths L8 and L5 of the groove 34 to a certain range ensures that the depth of the groove 34 is adapted to the size of the buffer cavity 4, which neither affects the buffering effect nor fails to guarantee the strength of the bottom.

[0061] Furthermore, in an optional embodiment, along the length direction of the cover plate body 1, a plurality of grooves 34 are formed on the bottom outer surface of the protrusion 3, and the distance between two adjacent grooves 34 is L9mm, where L9mm satisfies 3mm≤L9mm≤8mm.

[0062] Furthermore, in this embodiment, L9mm can be 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, etc. Of course, this embodiment is merely an example illustrating the specific numerical range of L9mm, but it does not impose limitations. Those skilled in the art can modify it according to actual circumstances, as long as the same technical effect is achieved.

[0063] In this embodiment, by setting multiple grooves 34, the number of pressure relief points can be increased, allowing gas to be discharged from different locations and reducing the pressure load on a single channel. Furthermore, limiting the distance between two adjacent grooves 34 within a certain range can improve pressure relief uniformity and avoid localized pressure concentration. If the distance is too small, the grooves 34 will be too dense, potentially weakening the bottom strength. If the distance is too large, the pressure relief points will be sparsely distributed, easily leading to excessively high localized pressure. Therefore, limiting the distance within a certain range can balance pressure relief uniformity and structural strength.

[0064] Furthermore, in an optional embodiment, the groove 34 at least partially overlaps with the projection of the sidewall 32 along a direction perpendicular to the cover plate body 1. For example, the groove 34 can be directly formed at the bottom of the sidewall 32 or in the middle of the sidewall 32. The number of grooves can also be changed by those skilled in the art according to the actual situation.

[0065] In this configuration, the groove 34 and the sidewall 32 are at least partially overlapped in projection, meaning that the groove 34 is close to the sidewall 32, which is one of the boundaries of the buffer cavity 4. This allows the depressurized gas to be discharged directly from the groove 34 into the buffer cavity 4, resulting in a shorter depressurization path, reduced flow resistance, and increased depressurization speed.

[0066] Furthermore, in an alternative implementation, such as Figure 6 As shown, along the horizontal direction, there is a spacing of D1mm between the sidewall 32 and the welding line 6, where D1mm satisfies 0.3mm≤D1mm≤0.8mm.

[0067] Furthermore, in this embodiment, D1mm can be 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, etc. Of course, this embodiment is merely an example illustrating the specific numerical range of D1mm, and is not intended to limit it. Those skilled in the art can modify it according to actual circumstances, as long as the same technical effect is achieved.

[0068] In this embodiment, the distance between the sidewall 32 and the weld line 6 is limited to a certain range, which avoids the sidewall 32 interfering with the welding process, ensures the quality of the weld line 6, and guarantees the supporting function of the sidewall 32 for the protrusion 3. If the distance is too small, the sidewall 32 may block the welding area, resulting in an incomplete weld line 6. If the distance is too large, the distance between the sidewall 32 and the weld line 6 will be too far, resulting in a loose internal structure of the protrusion 3, thereby affecting the overall strength.

[0069] Furthermore, in an alternative implementation, such as Figure 4 As shown, along the length of the cover plate body 1, there is a spacing of D2mm between two opposite side walls 32, where D2mm satisfies 10mm≤D2mm≤35mm.

[0070] For example, D2mm can be 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, 24mm, 25mm, 26mm, 27mm, 28mm, 29mm, 30mm, 31mm, 32mm, 33mm, 34mm, 35mm, etc. Of course, this embodiment is merely an example illustrating the specific numerical range of D2mm, and does not impose any limitations. Those skilled in the art can modify it according to actual circumstances, as long as the same technical effect is achieved.

[0071] In this embodiment, the spacing between the opposite sidewalls 32 is limited to a certain range, ensuring the lateral volume of the buffer cavity 4 and optimizing the pressure buffering effect. Since the width of the buffer cavity 4 is directly determined by its size, if it is too small, the lateral space of the buffer cavity 4 will be insufficient, failing to buffer the depressurized gas. If it is too large, the overall volume of the protrusion 3 will increase, thus occupying internal battery space and reducing the utilization rate of internal battery space.

[0072] Furthermore, in an alternative implementation, such as Figure 4 As shown, the bottom wall 31 has a grid structure, and the grid in the grid structure forms pressure relief holes.

[0073] With this configuration, this embodiment uses the grid structure to form a physical barrier. When large, incompletely burned particles are ejected from the battery cell, the grid structure can block them, preventing them from being ejected and thus avoiding the possibility of large particles burning adjacent batteries and causing a chain reaction of thermal runaway. Simultaneously, the pressure relief holes formed by the grid provide normal pressure relief channels for gases and small ejected materials, preventing a sudden increase in internal battery pressure due to complete sealing, which could lead to a casing explosion. Furthermore, this embodiment sets the explosion-proof plate 2 and the reinforcing grid independently, ensuring that the reinforcing grid does not interfere with the explosion-proof plate 2's operation under preset pressure, thereby balancing reliability and protective effect.

[0074] Furthermore, in an alternative implementation, such as Figure 4 As shown, the grid structure is formed by the intersection of multiple reinforcing ribs. The width of the reinforcing rib is D3mm, and the spacing between two adjacent reinforcing ribs arranged in the same direction is D4mm. D3mm satisfies 1mm≤D3mm≤3mm, and D4mm satisfies 10mm≤D4mm≤30mm.

[0075] For example, D3mm can be 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3mm, etc. Of course, this embodiment is merely an example illustrating the specific numerical range of D3mm, and does not impose any limitations. Those skilled in the art can modify it according to actual circumstances, as long as the same technical effect is achieved.

[0076] Similarly, D4mm can be 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, 24mm, 25mm, 26mm, 27mm, 28mm, 29mm, 30mm, etc. Of course, this embodiment is merely an example illustrating the specific numerical range of D4mm, and does not impose any limitations. Those skilled in the art can modify it according to actual circumstances, as long as the same technical effect is achieved.

[0077] Of course, multiple reinforcing ribs can intersect perpendicularly or obliquely. This embodiment is merely an example of the intersecting forms of multiple reinforcing ribs, but it does not limit the scope of the invention. Those skilled in the art can modify the embodiments according to actual circumstances, as long as the same technical effect is achieved.

[0078] In this embodiment, by limiting the width of the reinforcing ribs and the spacing between adjacent reinforcing ribs within a certain range, the strength of the grid structure and the effective area of ​​the pressure relief holes can be balanced. If the spacing is too small, the grid will lack sufficient strength and is prone to breakage during thermal runaway pressure relief. If the spacing is too large, it will occupy too much space, thereby reducing the area of ​​the pressure relief holes and affecting the pressure relief effect. Furthermore, if the spacing is too small, the area of ​​the pressure relief holes will be insufficient, affecting the pressure relief effect. If the spacing is too large, the grid's supporting force will be weakened. Therefore, limiting the width of the reinforcing ribs and the spacing between adjacent reinforcing ribs within a certain range ensures that the grid has sufficient strength to support the bottom wall 31, while also ensuring that the total area of ​​the pressure relief holes meets the exhaust requirements.

[0079] Furthermore, in an optional embodiment, a plurality of grooves 34 are formed on the bottom outer surface of the protrusion 3 along the length direction of the cover plate body 1, and the ends of the reinforcing ribs are staggered from the grooves 34. That is, the grooves 34 can be provided on both sides of the end of each reinforcing rib, and the number of grooves can be one, two, three, four, etc. This embodiment is merely an example of the number of grooves 34, but it is not limited thereto. Those skilled in the art can make changes according to the actual situation, as long as the same technical effect is achieved.

[0080] In this embodiment, by offsetting the ends of the reinforcing ribs from the groove 34, stress concentration can be avoided, thus improving the structural durability of the bottom of the protrusion 3. If the ends of the reinforcing ribs coincide with the groove 34, the structural weakness at the groove 34 will overlap with the stress concentration point at the end of the rib, weakening the overall structural strength and potentially causing cracking at the bottom. Therefore, offsetting the ends of the reinforcing ribs from the groove 34 disperses stress, resulting in a more uniform force distribution and extending the service life of the structure.

[0081] Furthermore, in an alternative implementation, such as Figure 4 As shown, along the horizontal direction, there is a spacing of D5mm between the end of the reinforcing rib and the groove 34, so that the end of the reinforcing rib and the groove 34 are staggered, and D5mm satisfies 1mm≤D5mm≤5mm.

[0082] For example, D5mm can be 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, etc. Of course, this embodiment is merely an example illustrating the specific numerical range of D5mm, and does not impose any limitations. Those skilled in the art can modify it according to actual circumstances, as long as the same technical effect is achieved.

[0083] In this embodiment, the distance between the end of the reinforcing rib and the groove 34 is limited to a certain range, ensuring a staggered effect and effectively dispersing stress. If D5 is too small, the staggered distance will be insufficient, and local stress concentration may still occur. If it is too large, it will increase the overall size of the bottom of the protrusion 3, occupying space. Therefore, within the limited range, the structural volume can be controlled while ensuring the stress dispersion effect.

[0084] Furthermore, in an alternative implementation, such as Figure 4As shown, along the width direction of the cover plate body 1, the side wall 32 and the edge of the cover plate body 1 are provided with a spacing of D6mm, where D6mm satisfies 2mm≤D6mm≤50mm.

[0085] For example, D6mm can be 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, etc. Of course, this embodiment is merely an example illustrating the specific numerical range of D6mm, and does not impose any limitations. Those skilled in the art can modify it according to actual circumstances, as long as the same technical effect is achieved.

[0086] In this embodiment, the distance between the sidewall 32 and the edge of the cover body 1 is limited to a certain range. This ensures that the edge of the cover body 1 has sufficient strength to support the connection between the cover and the housing, while also reserving installation positions for other components. If D6 is too small, the edge of the cover body 1 will be too narrow, leading to damage during installation or thermal runaway impacts. If D6 is too large, it will waste internal battery space and reduce the structural strength of the cover body 1.

[0087] Furthermore, in an optional embodiment, the explosion-proof sheet 2 is provided with a notch 21. The notch 21 on the explosion-proof sheet 2 can be formed by stamping or laser etching. The notch 21 is used to release pressure when the internal pressure of the battery reaches a certain level. Of course, the notch 21 can also be replaced with a thinning area. This embodiment is merely an example of the notch 21, but it is not intended to limit the scope. Those skilled in the art can make changes according to the actual situation, as long as the same technical effect is achieved.

[0088] As for the notch 21, the thickness of the notch 21 position is smaller than the thickness of the explosion-proof sheet 2 itself. Therefore, when the battery experiences thermal runaway and the internal pressure of the battery reaches a certain level, the notch 21 can be broken through in time to complete the pressure relief.

[0089] In this embodiment, the notch 21 serves as a weak point in the explosion-proof disc 2, guiding it to rupture along the notch 21 under a set pressure, thus preventing disordered gas ejection caused by random rupture locations. Furthermore, the rupture location and pressure threshold of the explosion-proof disc 2 can be controlled by adjusting the notch 21's position and depth, improving the controllability of pressure relief.

[0090] Furthermore, in an alternative implementation, such as Figure 6 As shown, along the horizontal direction, there is a spacing of D7mm between the groove 21 and the side wall 32, where D7mm satisfies 0.5mm≤D7mm≤5mm.

[0091] For example, D7mm can be 0.5mm, 0.56mm, 0.57mm, 0.58mm, 0.59mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, etc. Of course, this embodiment is merely an example illustrating the specific numerical range of D7mm, and is not intended to limit it. Those skilled in the art can modify it according to actual circumstances, as long as the same technical effect is achieved.

[0092] In this embodiment, the distance between the notch 21 and the sidewall 32 is set within a certain range, which effectively controls the pressure relief area. While achieving normal pressure relief, it also provides a certain degree of protection for the buffer cavity 4. If D7 is too small, the notch 21 will be too close to the sidewall 32, resulting in an excessively large pressure relief area, which may lead to uncontrolled pressure relief. Furthermore, if the explosion-proof sheet 2 ruptures, the gas may directly impact the sidewall 32, causing deformation and affecting the structural strength of the buffer cavity 4. If D7 is too large, the notch 21 will be too far from the edge, resulting in a smaller pressure relief area and affecting the pressure relief speed.

[0093] Furthermore, in an alternative implementation, such as Figure 6 As shown, the thickness of sidewall 32 is D8mm, and the product of D8mm and D7mm satisfies 0.5mm. 2 ≤D8*D7mm 2 ≤10mm 2 Furthermore, D8mm satisfies 1mm≤D8mm≤3mm.

[0094] For example, D8*D7mm 2 It can be 0.5mm 2 0.56mm 2 0.57mm 2 0.58mm 2 0.59mm 2 1mm 2 1.5mm 2 2mm 2 2.5mm 2 3mm 2 3.5mm 2 4mm 2 4.5mm 2 5mm 2 5.5mm 2 6mm 2 6.5mm 2 7mm 2 7.5mm 2 8mm 2 8.5mm 29mm 2 9.5mm 2 10mm 2 Wait a minute. Of course, this embodiment only applies to D8*D7mm. 2 The specific numerical range is given as an example, but there is no limitation on it. Those skilled in the art can make changes according to the actual situation, as long as the same technical effect can be achieved.

[0095] For example, D8mm can be 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3mm, etc. Of course, this embodiment is merely an example illustrating the specific numerical range of D8mm, and does not impose any limitations. Those skilled in the art can modify it according to actual circumstances, as long as the same technical effect is achieved.

[0096] In this embodiment, with such a configuration, D8*D7mm 2 By controlling the product within a certain range, the strength of the sidewall 32 and the pressure relief of the notch 21 can be balanced, ensuring that the sidewall 32 can withstand gas impacts while the notch 21 can efficiently guide pressure relief. If the product is too small, the sidewall 32 may be easily damaged by the impact of ruptured gas due to being too thin or the distance between the notch 21 and the sidewall 32 being too small. If the product is too large, the pressure relief efficiency and the overall volume of the structure may be affected due to the sidewall 32 being too thick or the distance between the notch 21 and the sidewall 32 being too large.

[0097] Furthermore, in an optional embodiment, the cover plate body 1 and the protrusion 3 are integrally connected, and the protrusion 3 is made of metal.

[0098] Furthermore, in an alternative implementation, such as Figure 6 As shown, the cover plate body 1 has a recess 12 on the outer periphery of the edge of the protrusion 3, and the recess 12 is connected to the side wall 32.

[0099] Furthermore, in an optional embodiment, in the vertical direction, the depth of the recess 12 is D9mm, the height of the protrusion 3 is D10mm, D10mm is D6mm + D7mm, and the ratio between D9 and D10, D9 / D10, satisfies 0.1≤D9 / D10≤0.3. Specifically, 0.5mm≤D9mm≤1.5mm, and 1.5mm≤D10mm≤8mm.

[0100] Furthermore, in this embodiment, the ratio D9 / D10 can be 0.1, 0.11, 0.12, 0.13, 0.14, 0.15, 0.16, 0.17, 0.18, 0.19, 0.2, 0.21, 0.22, 0.23, 0.24, 0.25, 0.26, 0.27, 0.28, 0.29, 0.3, etc. Of course, this embodiment is merely an example illustrating the specific numerical range of the ratio D9 / D10, but it is not intended to limit the scope. Those skilled in the art can modify it according to actual circumstances, as long as the same technical effect is achieved.

[0101] Furthermore, in this embodiment, D9mm can be 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, 0.85mm, 0.9mm, 0.95mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, etc. Of course, this embodiment is merely an example illustrating the specific numerical range of D9mm, and is not intended to limit it. Those skilled in the art can modify it according to actual circumstances, as long as the same technical effect is achieved.

[0102] Furthermore, in this embodiment, D10mm can be 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, etc. Of course, this embodiment is merely an example illustrating the specific numerical range of D10mm, and does not impose any limitations. Those skilled in the art can modify it according to actual circumstances, as long as the same technical effect is achieved.

[0103] In this embodiment, by limiting the ratio between D9 and D10 within a certain range, the pressure relief area of ​​the pressure relief channel can be controlled within a certain range to ensure the pressure relief effect. It can also appropriately reduce the weight of the cover plate. If the ratio is too small, the recess 12 may be too shallow, resulting in a small pressure relief area and a weak auxiliary pressure relief effect. If the ratio is too large, the recess 12 may be too deep, potentially weakening the structural strength of the cover plate edge.

[0104] Furthermore, in an alternative implementation, such as Figure 6As shown, a boss 13 is provided on the top of the cover plate body 1 in the vertical direction, and the boss 13 is correspondingly provided with the recess 12; and in the horizontal direction, the width of the boss 13 is W1mm, the width of the recess 12 is W2mm, and the ratio W1 / W2 between W1 and W2 satisfies 0.6≤W1 / W2≤1. Furthermore, 0.5mm≤W1mm≤2mm, 0.5mm≤W2mm≤3mm.

[0105] Furthermore, in this embodiment, the ratio W1 / W2 can be 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1, etc. Of course, this embodiment is merely an example illustrating the specific numerical range of the ratio W1 / W2, but it is not intended to limit the scope. Those skilled in the art can modify it according to actual circumstances, as long as the same technical effect is achieved.

[0106] Furthermore, in this embodiment, W1mm can be 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, 0.85mm, 0.9mm, 0.95mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, etc. Of course, this embodiment is merely an example illustrating the specific numerical range of W1mm, and does not impose any limitations. Those skilled in the art can modify it according to actual circumstances, as long as the same technical effect is achieved.

[0107] Furthermore, in this embodiment, W2mm can be 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, 0.85mm, 0.9mm, 0.95mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3mm, etc. Of course, this embodiment is merely an example illustrating the specific numerical range of W2mm, and does not impose any limitations. Those skilled in the art can modify it according to actual circumstances, as long as the same technical effect is achieved.

[0108] In this embodiment, by controlling the ratio between W1 and W2 within a certain range, the stress on the edge of the cover plate can be made uniform, improving the structural balance of the cover plate body 1 and preventing local deformation. If the ratio is too small, the boss 13 will be too narrow and unable to achieve a certain stress dispersion effect, while the overall structural strength of the cover plate will be low. If the ratio is too large, the boss 13 will be too wide, increasing the weight and volume of the cover plate.

[0109] Secondly, the present invention also provides a battery, which includes: a housing and a battery cell disposed in the housing, the housing being provided with a battery cover assembly as described in any of the above embodiments.

[0110] Furthermore, in an alternative embodiment, the protrusion 3 is provided on the side of the cover plate body 1 facing the battery cell.

[0111] Furthermore, in an alternative implementation, such as Figure 6 As shown, an insulating layer 5 is provided between the protrusion 3 and the battery cell. The thickness of the insulating layer 5 is D11mm, and D11mm satisfies 0.12mm≤D11mm≤2.5mm. The insulating layer 5 can be made of materials such as PI (Polyimide), PET (Polyethylene Terephthalate), and PP (Polypropylene).

[0112] For example, D11mm can be 0.12mm, 0.13mm, 0.14mm, 0.15mm, 0.16mm, 0.17mm, 0.18mm, 0.19mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, etc. Of course, this embodiment is merely an example illustrating the specific numerical range of D11mm, and does not impose any limitations. Those skilled in the art can modify it according to actual circumstances, as long as the same technical effect is achieved.

[0113] In this embodiment, by controlling the thickness of the insulating layer 5 within a certain range, the conductive contact between the protrusion 3 and the battery cell can be blocked, preventing short circuits caused by vibration and deformation. It also improves the space utilization of the battery. If the insulating layer 5 is too thin, it may cause insulation failure; if the insulating layer 5 is too thick, it will result in poor space utilization inside the battery.

[0114] Thirdly, the present invention also provides a battery pack, which includes a battery as described in any of the above embodiments.

[0115] 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 such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery cover assembly, characterized in that, include: The cover plate body (1) has mounting holes (11); An explosion-proof sheet (2) is provided in the mounting hole (11) and completely covers the mounting hole (11); the explosion-proof sheet (2) is used to release pressure after the battery reaches a certain pressure; A protrusion (3) is provided, one end of which is connected to the cover plate body (1) and is located on the side away from the explosion-proof sheet (2); and the protrusion (3) extends along a direction perpendicular to the cover plate body (1) to form a side wall (32) and a bottom wall (31); the projection of the protrusion (3) at least partially overlaps with that of the explosion-proof sheet (2); and pressure relief holes are provided at least on the bottom wall (31) and / or the side wall (32); The buffer cavity (4) is formed by the side wall (32), the bottom wall (31) and the explosion-proof sheet (2).

2. The battery cover assembly according to claim 1, characterized in that, The end face of the protrusion (3) away from the bottom wall (31) is provided with a stepped structure. The first step (33) of the stepped structure is used to install the explosion-proof sheet (2). The explosion-proof sheet (2) is welded to the first step (33) to form a weld line (6).

3. The battery cover assembly according to claim 2, characterized in that, The bottom wall (31) of the first step (33) is welded to the explosion-proof sheet (2).

4. The battery cover assembly according to claim 3, characterized in that, Along the first direction, the height of the first step (33) is L1mm, satisfying: 0.5mm≤L1mm≤1mm, and / or the width of the first step (33) is L2mm, satisfying: 0.5mm≤L2mm≤2.5mm.

5. The battery cover assembly according to claim 4, characterized in that, The edge of the explosion-proof sheet (2) is welded to the first step (33) to form a weld line (6). The depth of the weld line (6) is L3mm in the vertical direction and L4mm in the horizontal direction. The ratio of L3 to L1, L3 / L1, satisfies: 0.45≤L3 / L1≤1; and / or the ratio of L4 to L2, L4 / L2, satisfies: 0.2≤L4 / L2≤1.

6. The battery cover assembly according to claim 5, characterized in that, In the vertical direction, the distance between the bottom of the welding line (6) and the bottom wall (31) is L5mm, and the distance between the bottom of the explosion-proof sheet (2) and the bottom wall (31) is L6mm. The L5mm satisfies 0.5mm≤L5mm≤5mm, and / or the L6mm satisfies 1mm≤L6mm≤6mm.

7. The battery cover assembly according to claim 6, characterized in that, In the vertical direction, the thickness of the bottom wall (31) is L7mm, and the ratio L7 / L5 between L7 and L5 satisfies 0.2≤L7 / L5≤1.

8. The battery cover assembly according to claim 2, characterized in that, The bottom outer surface of the protrusion (3) is provided with a groove (34), which is connected to the buffer cavity (4).

9. The battery cover assembly according to claim 8, characterized in that, In the vertical direction, the depth of the groove (34) is L8mm, the distance between the bottom of the welding line (6) and the bottom wall (31) is L5mm, and the ratio between L8 and L5, L8 / L5, satisfies 0.2≤L8 / L5≤0.

8.

10. The battery cover assembly according to claim 9, characterized in that, Along the length of the cover plate body (1), a plurality of grooves (34) are provided on the bottom outer surface of the protrusion (3), and the distance between two adjacent grooves (34) is L9mm, wherein L9mm satisfies 3mm≤L9mm≤8mm.

11. The battery cover assembly according to any one of claims 8 to 10, characterized in that, Along a direction perpendicular to the cover body (1), the groove (34) at least partially overlaps with the projection of the sidewall (32).

12. The battery cover assembly according to any one of claims 2 to 9, characterized in that, Along the horizontal direction, a spacing of D1mm is provided between the sidewall (32) and the welding line (6), wherein D1mm satisfies 0.3mm≤D1mm≤0.8mm.

13. The battery cover assembly according to any one of claims 1 to 9, characterized in that, Along the width direction of the cover plate body (1), there is a spacing of D2mm between two opposite side walls (32), wherein D2mm satisfies 10mm≤D2mm≤35mm.

14. The battery cover assembly according to any one of claims 1 to 9, characterized in that, The bottom wall (31) has a grid structure, and the grid in the grid structure forms the pressure relief hole.

15. The battery cover assembly according to claim 14, characterized in that, The grid structure is formed by the intersection of multiple reinforcing ribs. The width of the reinforcing rib is D3mm, and the spacing between two adjacent reinforcing ribs arranged in the same direction is D4mm. The D3mm satisfies 1mm≤D3mm≤3mm, and the D4mm satisfies 10mm≤D4mm≤30mm.

16. The battery cover assembly according to claim 15, characterized in that, Along the length of the cover plate body (1), a plurality of grooves (34) are provided on the bottom outer surface of the protrusion (3), and the ends of the reinforcing ribs are offset from the grooves (34).

17. The battery cover assembly according to claim 16, characterized in that, Along the horizontal direction, the end of the reinforcing rib is provided with a distance of D5mm between it and the groove (34), so that the end of the reinforcing rib is staggered from the groove (34), and the D5mm satisfies 1mm≤D5mm≤5mm.

18. The battery cover assembly according to any one of claims 1 to 9, characterized in that, Along the width direction of the cover plate body (1), a distance of D6mm is provided between the side wall (32) and the edge of the cover plate body (1), wherein D6mm satisfies 2mm≤D6mm≤50mm.

19. The battery cover assembly according to any one of claims 1 to 9, characterized in that, The explosion-proof sheet (2) is provided with a groove (21), which is used to puncture the battery after it reaches a certain pressure to release pressure.

20. The battery cover assembly according to claim 19, characterized in that, Along the horizontal direction, a distance of D7mm is provided between the groove (21) and the sidewall (32), wherein D7mm satisfies 0.5mm≤D7mm≤5mm.

21. The battery cover assembly according to claim 20, characterized in that, The thickness of the sidewall (32) is D8mm, and the product of D8mm and D7mm satisfies 0.5mm. 2 ≤D8*D7mm 2 ≤10mm 2 .

22. The battery cover assembly according to any one of claims 1 to 9, characterized in that, The cover plate body (1) and the protrusion (3) are integrally connected, and the protrusion (3) is made of metal.

23. The battery cover assembly according to any one of claims 1 to 9, characterized in that, The cover plate body (1) has a recess (12) on the outer periphery of the edge of the protrusion (3), and the recess (12) is connected to the side wall (32).

24. The battery cover assembly according to claim 23, characterized in that, In the vertical direction, the depth of the recess (12) is D9mm, the height of the protrusion (3) is D10mm, and the ratio of D9 to D10, D9 / D10, satisfies 0.1≤D9 / D10≤0.

3.

25. The battery cover assembly according to claim 24, characterized in that, Along the vertical direction, the top of the cover plate body (1) is provided with a boss (13), and the boss (13) is provided in correspondence with the recess (12).

26. The battery cover assembly according to claim 25, characterized in that, Along the horizontal direction, the width of the boss (13) is W1mm, the width of the recess (12) is W2mm, and the ratio W1 / W2 between W1 and W2 satisfies 0.6≤W1 / W2≤1.

27. A battery, characterized in that, It includes: a housing and a battery cell disposed in the housing, the housing being provided with a battery cover assembly as described in any one of claims 1 to 26.

28. The battery according to claim 27, characterized in that, The protrusion (3) is provided on the side of the cover plate body (1) facing the battery cell.

29. The battery according to claim 28, characterized in that, An insulating layer (5) is provided between the protrusion (3) and the battery cell. The thickness of the insulating layer (5) is D11mm, and D11mm satisfies 0.12mm≤D11mm≤2.5mm.

30. A battery pack, characterized in that, include: The battery as described in any one of claims 27 to 29.

Images