Cover plate structure, battery case, and battery device

Abstract

The utility model relates to battery technology field, concretely relates to a cover plate structure, battery housing and battery device. The cover plate structure includes: cover plate, is seted up with through -hole, strengthens subassembly, sets up in the edge circumference of through -hole and surrounds and forms the mounting hole, the anti -explosion piece sets up in the mounting hole and covers the mounting hole completely, the weak part is arranged between the anti -explosion piece and the inside edge of strengthening subassembly, and strengthening subassembly includes the strengthening part, the buffer part. In the utility model, the top of strengthening part protrudes and the bottom of buffer part recesses and the corresponding scheme, forms the reinforced structure that can form simultaneously on both sides, can form rigid support, can effectively promote the deformation resistance of through -hole edge, the recess of buffer part forms the buffer when thermal runaway, reduces the problem that the cover plate structure is easy to deform when thermal runaway gas production, and further guarantees the anti -explosion piece to open steadily according to the preset pressure, reduces the thermal runaway safety risk.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a cover plate structure, a battery casing, and a battery device. 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 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. Typically, an explosion-proof valve is installed on the battery, and a weak point is designed on the explosion-proof valve so that the valve can be triggered to open by pressing the weak point.

[0003] However, the part of the battery casing near the explosion-proof valve is prone to deformation when thermal runaway produces gas, which will squeeze the weak area of ​​the explosion-proof sheet, causing the valve to open prematurely, which can easily affect the safety of the power battery. Utility Model Content

[0004] In view of this, the present invention provides a cover plate structure, a battery casing, and a battery device to solve the problem that the battery casing is prone to deformation during thermal runaway gas generation.

[0005] In a first aspect, this utility model provides a cover plate structure for a battery, the cover plate structure comprising: The cover plate body has through holes; A reinforcing component is provided circumferentially at the edge of the through hole and surrounds it to form the mounting hole; 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. The enhancement components include: The reinforcing part protrudes from the top of the cover plate body and is located circumferentially around the edge of the through hole; A buffer section is provided at the bottom of the cover plate body and recessed towards the top of the cover plate body to form a groove; the buffer section and the reinforcing section are at least partially corresponding.

[0006] Beneficial effects: In this embodiment, the top of the reinforcing part protrudes and the bottom of the buffer part is recessed, which corresponds to the design. This forms a reinforcing structure on both the top and bottom sides, thereby forming a rigid support and effectively improving the deformation resistance of the through hole edge. At the same time, the groove of the buffer part forms a buffer during thermal runaway, reducing the problem that the cover plate structure is prone to deformation when thermal runaway gas is generated. This ensures that the explosion-proof sheet opens stably according to the preset pressure and reduces the safety risk of thermal runaway.

[0007] Secondly, this utility model also provides a battery housing, which includes: The outer casing has a receiving cavity; The cover structure of any of the above embodiments includes a cover body disposed on the outer shell and sealing the opening of the receiving cavity.

[0008] Thirdly, this utility model also provides a battery device, which includes: Battery cell assembly; The battery casing of the above embodiment is provided with a receiving cavity; the receiving cavity is suitable for installing the battery cell assembly. Attached Figure Description

[0009] 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.

[0010] Figure 1 This is a front view of the cover plate structure without the explosion-proof sheet in this embodiment of the utility model; Figure 2 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 3 for Figure 2 Schematic diagram of the rear structure of the middle cover plate; Figure 4 for Figure 1 A sectional view of the cover plate structure in the middle; Figure 5 for Figure 2 A sectional view of the cover plate structure in the middle; Figure 6 for Figure 5 An enlarged schematic diagram of part A in the middle.

[0011] Explanation of reference numerals in the attached figures: 1. Cover plate body; 2. Reinforcing component; 21. Mounting hole; 22. Reinforcing part; 221. First step; 222. Second step; 23. Buffer section; 3. Explosion-proof sheet; 31. Score. Detailed Implementation

[0012] 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.

[0013] 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.

[0014] 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.

[0015] 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.

[0016] 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. Typically, an explosion-proof valve is installed on the battery, with a weak point on the valve, allowing it to be triggered by pressure compressing this weak point. However, the portion of the battery casing near the explosion-proof valve is prone to deformation during thermal runaway gas generation, which can compress the weak point of the explosion-proof valve, causing premature valve opening pressure and potentially compromising the safety of the power battery.

[0017] In view of this, the present invention provides a cover plate structure, a battery housing, and a battery device to solve the problem that the explosion-proof valve is prone to deformation when thermal runaway gas generation occurs.

[0018] The following is combined Figures 1 to 6 The following describes embodiments of the present invention.

[0019] According to an embodiment of the present invention, in one aspect, a cover plate structure is provided for use on a battery. The cover plate structure includes a cover plate body 1, a reinforcing component 2, and an explosion-proof sheet 3.

[0020] Specifically, in this embodiment, such as Figures 1 to 6 As shown, the cover plate body 1 has a through hole. The shape of the through hole 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 through hole, 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.

[0021] Furthermore, in this embodiment, as Figures 1 to 6 As shown, the reinforcing component 2 is disposed circumferentially around the edge of the through hole and surrounds it to form the mounting hole 21. The structural type of the mounting hole 21 matches the structural type of the explosion-proof sheet 3. Of course, in order to ensure that the structural strength around the mounting hole 21 is relatively consistent, the thickness of the reinforcing component 2 can be uniformly set, so that the shape of the mounting hole 21 is also consistent with the shape of the through hole.

[0022] Furthermore, in this embodiment, as Figures 1 to 6 As shown, the explosion-proof plate 3 is disposed in the mounting hole 21 and completely covers the mounting hole 21. The explosion-proof plate 3 is used to release pressure when the internal pressure of the battery reaches a certain level. The explosion-proof plate 3 can be connected to the wall of the mounting hole 21 by welding, but other connection methods can also be used; this embodiment is merely an example.

[0023] Furthermore, in this embodiment, as Figures 1 to 6 As shown, the reinforcing component 2 includes a reinforcing part 22 and a buffer part 23. The reinforcing part 22 protrudes from the top of the cover body 1 and is disposed circumferentially at the edge of the through hole. This allows the reinforcing part 22 to reinforce the top of the cover body 1, and the buffer part 23 forms a gas buffer zone, which can prevent the top of the cover body 1 from deforming in the event of thermal runaway of the battery.

[0024] Meanwhile, a buffer portion 23 is disposed at the bottom of the cover plate body 1 and recessed towards the top of the cover plate body 1 to form a groove. The buffer portion 23 and the reinforcing portion 22 are at least partially corresponding. That is, in the vertical direction, the buffer portion 23 and the reinforcing portion 22 at least partially overlap. This allows the buffer portion 23 to reinforce the bottom of the cover plate body 1. Since the bottom of the cover plate body 1 is the area directly exposed to the thermal runaway pressure, the recess of the buffer portion 23 towards the top of the cover plate body 1 can form a buffer structure. At the same time, the buffer portion 23 corresponds to the reinforcing portion 22, which not only buffers the gas but also strengthens the structure, ultimately effectively preventing deformation of the cover plate body 1.

[0025] With this configuration, in this embodiment, the top of the reinforcing part 22 protrudes and the bottom of the buffer part 23 is recessed, forming a reinforcement structure that can be formed on both the upper and lower sides at the same time. This can create a rigid support and effectively improve the deformation resistance of the through hole edge. At the same time, the groove of the buffer part 23 forms a buffer during thermal runaway, reducing the problem that the cover plate structure is prone to deformation during thermal runaway gas generation. This ensures that the explosion-proof sheet 3 opens stably at the preset pressure, reducing the safety risk of thermal runaway.

[0026] Furthermore, since the notch 31 is located between the explosion-proof sheet 3 and the inner edge of the reinforcing component 2, and because the reinforcing component 2 has high strength and small deformation, the notch 31 can be prevented from being squeezed or pulled by the deformation of the cover plate body 1, ensuring that the notch 31 only breaks under the preset pressure, thus avoiding premature valve opening or pressure deviation.

[0027] Furthermore, in an alternative implementation, such as Figures 1 to 6 As shown, the reinforcing part 22 is recessed into the mounting hole 21 on the side near the mounting hole 21 to form a mounting part. The mounting part has a stepped structure, and the stepped structure is provided at least on the side of the reinforcing part 22 near the mounting hole 21. That is, one side of the reinforcing part 22 is a stepped mounting part, and the other side can also have a stepped structure to strengthen the overall structure of the reinforcing part 22, so that the reinforcing part 22 is a single-sided step or a double-sided step. That is, when the reinforcing part 22 is a single-sided step, the side of the reinforcing part 22 with the stepped structure can face the mounting hole 21. When the reinforcing part 22 is a double-sided step, the stepped structure can be installed on the side facing the mounting hole 21 and the side away from the mounting hole 21, respectively.

[0028] In this embodiment, the mounting part includes at least a first step 221, which surrounds the mounting hole 21, so that it can be used to install and limit the explosion-proof sheet 3.

[0029] In this embodiment, the reinforcing part 22 is configured as a stepped structure, which significantly increases the structural strength of the reinforcing part 22 compared to a single convex hull. When the battery experiences thermal runaway, the reinforcing part 22 can effectively disperse the gas impact force during thermal runaway, thereby avoiding damage to the scratch 31 caused by local stress concentration, and thus improving the impact resistance of the overall structure of the explosion-proof valve.

[0030] Furthermore, in an alternative implementation, such as Figure 6 As shown, the height of the first step 221 is H1mm, and H1 satisfies: 0.3≤H1≤1.

[0031] For example, H1 can be 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, etc. Of course, this embodiment is merely an example of a specific value for H1, but it is not intended to limit the value. Those skilled in the art can modify it according to the actual situation, as long as the same technical effect is achieved.

[0032] By setting the step height within a certain range, this embodiment balances the step's support strength with structural compactness, while also preventing the step from occupying too much space and affecting the battery's space utilization. If the step height is too small, its support strength will be insufficient, failing to effectively disperse the stress at the edge of the explosion-proof sheet 3, making it prone to deformation during thermal runaway gas generation. If the step height is too large, it will occupy too much space, affecting the battery's space utilization, and may also interfere with other internal battery structures.

[0033] Furthermore, in an alternative implementation, such as Figure 6 As shown, the length of the first step 221 is D1mm, and D1 satisfies: 1.5≤D1≤2.2.

[0034] For example, D1 can be 1.5, 1.6, 1.7, 1.8, 1.9, 2, 2.1, 2.2, etc. Of course, this embodiment is merely an example of a specific value for D1, but it is not intended to limit the value. Those skilled in the art can make changes according to the actual situation, as long as the same technical effect is achieved.

[0035] In this embodiment, the length of the step is related to the load-bearing capacity of the step structure. Limiting the length of the step within a certain range maximizes the support area of ​​the step within a limited space, thereby improving its resistance to deformation. If the length of the step is too small, the support area of ​​the step on the edge of the explosion-proof sheet 3 will be insufficient, and the explosion-proof sheet 3 will easily deform locally when subjected to impact. If the length of the step is too large, it may increase the overall width of the reinforcing part 22, occupying too much space in the cover plate body 1, and may also reduce the burst area of ​​the explosion-proof valve, affecting the pressure relief performance.

[0036] Furthermore, in an alternative implementation, such as Figure 6 As shown, the depth of the groove is H2mm, and H2 satisfies: 0.3≤H2≤1.5.

[0037] For example, H2 can be 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.3, 1.4, 1.5, etc. Of course, this embodiment is merely an example of a specific value for H2, but it is not intended to limit the value. Those skilled in the art can modify it according to the actual situation, as long as the same technical effect is achieved.

[0038] In this embodiment, by limiting the depth of the groove within a certain range, the structural strength of the area surrounding the explosion-proof valve can be enhanced in conjunction with the reinforcing part 22, while ensuring the strength of the bottom structure. This also avoids strength reduction due to an excessively thin bottom structure of the cover plate body 1. If the groove depth is too small, the reinforcing effect of the bottom recess is insufficient, failing to achieve synergistic reinforcement with the top reinforcing part 22. If the groove depth is too large, the thickness at the corresponding position at the bottom of the cover plate body 1 may be too thin, potentially leading to rupture under thermal runaway pressure, thus reducing battery safety.

[0039] Furthermore, in an alternative implementation, such as Figure 6 As shown, the width of the groove is D2mm, and D2 satisfies: 0.5≤D2≤5.

[0040] For example, D2 can be 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2, 2.5, 3, 3.5, 4, 4.5, 5, etc. Of course, this embodiment is merely an example of a specific value for D2, 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.

[0041] In this embodiment, the groove width is limited to a certain range, which can evenly distribute the pressure of the reinforcing component 2 during thermal runaway. The cooperation between the buffer part 23 and the reinforcing part 22 can strengthen the surrounding structure of the explosion-proof valve, improving the overall deformation resistance of the cover plate structure. If the groove width is too small, the impact force cannot be dispersed in time, and the impact force is prone to local concentration, thus failing to effectively alleviate the stress on the edge of the explosion-proof plate 3. If the groove width is too large, it will expand the weak area at the bottom of the cover plate body 1, which may reduce the overall structural strength of the cover plate structure.

[0042] Furthermore, in an optional embodiment, the width of the groove is not less than the width of the reinforcing part 22 so that the buffer part 23 can better play a buffering role in the event of thermal runaway.

[0043] Furthermore, in an alternative implementation, such as Figures 1 to 6 As shown, the first step 221 of the stepped structure is used to install the explosion-proof sheet 3, and it is attached to the bottom edge of the explosion-proof sheet 3. For example, the stepped structure can be set with two, three, four, five, etc., and the first step 221 is one of the steps. Of course, those skilled in the art can change the position of the step where the explosion-proof sheet 3 is installed according to the actual situation. This embodiment is only an example, but it is not a limitation. As long as the same technical effect can be achieved, it is acceptable.

[0044] With this configuration, the steps on the stepped structure in this embodiment are used to install the explosion-proof disc 3. Since the steps fit snugly against the bottom edge of the explosion-proof disc 3, it can ensure that the explosion-proof disc 3 is subjected to uniform force when subjected to impact, reducing local stress concentration caused by installation gaps and improving valve opening stability. Furthermore, it can ensure that pressure is applied only to the area with the notch 31, guaranteeing that the explosion-proof disc 3 breaks along a preset path and improving the consistency of valve opening.

[0045] Furthermore, when the stepped structure has multiple steps, the inner steps are used to install the explosion-proof plate 3 in the vertical direction, while the outer steps, due to their larger space, facilitate the installation of the explosion-proof plate 3 and serve to limit and guide it. Simultaneously, the multiple steps allow for timely dispersion of impact forces when the explosion-proof plate 3 is subjected to impact, preventing stress concentration and thus improving the overall structural strength of the reinforcing part 22.

[0046] Furthermore, in an alternative implementation, such as Figures 1 to 6 As shown, the step surface of the first step 221 at least partially overlaps with the bottom edge of the explosion-proof plate 3. That is, the step surface of the first step 221 can completely overlap with the bottom edge of the explosion-proof valve, or 20%, 40%, 60%, or 80% of the inner ring area of ​​the step surface can overlap with the bottom edge of the explosion-proof plate 3. Of course, those skilled in the art can change the overlapping area of ​​the explosion-proof plate 3 and the first step 221 according to actual conditions. This embodiment is merely illustrative and does not impose limitations; achieving the same technical effect is sufficient.

[0047] With this configuration, at least a portion of the stepped surface in this embodiment overlaps with the bottom edge of the explosion-proof sheet 3, which increases the contact area between the explosion-proof sheet 3 and the step, further dispersing edge stress and improving installation stability. Furthermore, the overlapping portion expands the contact area between the explosion-proof sheet 3 and the step, allowing the force on the edge of the explosion-proof sheet 3 to be distributed over a larger area when subjected to thermal runaway impact, avoiding localized deformation caused by excessive stress at a single point.

[0048] Furthermore, in an alternative implementation, such as Figure 6 As shown, along the horizontal direction, the overlap distance between the step surface and the explosion-proof sheet 3 is L1mm, and L1 satisfies: 1.5≤L1≤1.9.

[0049] For example, L1 can be 1.5, 1.55, 1.6, 1.65, 1.7, 1.75, 1.8, 1.85, 1.9, etc. Of course, this embodiment is merely an example of a specific value for L1, but it is not intended to limit the value. Those skilled in the art can modify it according to the actual situation, as long as the same technical effect is achieved.

[0050] With this configuration, since the area of ​​the explosion-proof plate 3 is fixed, when there is an overlapping area between the step surface and the explosion-proof plate 3, the overlapping area may be quite close to the notch 31. Therefore, this embodiment limits the overlap distance between the step surface and the explosion-proof plate 3 to a certain range. This avoids excessive overlap affecting the effective opening area of ​​the explosion-proof plate 3, ensuring that the explosion-proof plate 3 can quickly release gas after opening. At the same time, it also ensures that the explosion-proof plate 3 is firmly installed, which can improve the support stability. If the overlap distance is too small, the contact area will be insufficient, and the stress cannot be effectively dispersed; if the overlap distance is too large, the area inside the notch 31 will be reduced, resulting in a reduction in the effective opening area of ​​the explosion-proof plate 3, thereby affecting the efficiency of thermal runaway gas discharge.

[0051] Furthermore, in an alternative implementation, such as Figure 6 As shown, the edge of the explosion-proof sheet 3 is welded to the step to form a weld line. The weld line width is D3, which satisfies the condition: 0.3≤D3≤1.5. The weld line depth is H3mm, which satisfies the condition: 0.3≤H3≤1.

[0052] For example, D3 can be 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.3, 1.4, 1.5, etc. H3 can be 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, etc. Of course, this embodiment is merely an example of the specific values ​​of D3 and H3, but it does not limit them. Those skilled in the art can make changes according to the actual situation, as long as the same technical effect is achieved.

[0053] By controlling the weld width within a certain range, this embodiment ensures the explosion-proof sheet 3 is firmly fixed without interfering with the fracture performance of the notch 31, thus guaranteeing stable valve opening pressure. If the weld line is too narrow, the welding strength will be insufficient. In the event of thermal runaway, the high temperature and impact force may cause the explosion-proof sheet 3 to detach from the weld instead of fracture along the notch 31, affecting battery safety. If the weld line is too wide, the edge of the explosion-proof sheet 3 will become more rigid due to weld hardening, potentially preventing the notch 31 from fractureing under the preset pressure, leading to valve opening delay.

[0054] Furthermore, in an optional embodiment, the mounting portion further includes a second step 222, which is located between the reinforcing portion 22 and the first step 221, with the step surface of the second step 222 located between the top surface of the reinforcing portion 22 and the step surface of the first step 221.

[0055] Furthermore, in an optional embodiment, the height of the second step 222 is H4mm, where H4 satisfies: 0.4≤H4≤1.

[0056] For example, H4 can be 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, etc. Of course, this embodiment is merely an example of a specific value for H4, but it is not intended to limit the value. Those skilled in the art can make changes according to the actual situation, as long as the same technical effect is achieved.

[0057] Furthermore, in an optional embodiment, the length of the second step 222 is D4mm, where D4 satisfies: 0.4≤D4≤1.

[0058] For example, D4 ​​can be 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, etc. Of course, this embodiment is merely an example of a specific value for D4, but it is not intended to limit the value. Those skilled in the art can make changes according to the actual situation, as long as the same technical effect is achieved.

[0059] Furthermore, in an optional embodiment, the height of the reinforcing part 22 protruding relative to the surface of the cover plate body 1 is H5mm, where H5 satisfies: 0.4≤H5≤2.

[0060] For example, H5 can be 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2, etc. Of course, this embodiment is merely an example of specific values ​​for H5, and 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.

[0061] Furthermore, in an optional embodiment, the explosion-proof sheet 3 is provided with a weak portion, which is used to rupture and release pressure when the internal pressure of the battery reaches a certain level. Of course, the weak portion can be a notch 31 or a thinning area. This embodiment is merely an example illustrating the specific type of weak portion, 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.

[0062] As for the weak part, its thickness is smaller than that of the explosion-proof sheet 3 itself. Therefore, when the battery experiences thermal runaway and the internal pressure of the battery reaches a certain level, the weak part can be broken through in time to complete the pressure relief.

[0063] Furthermore, in an optional embodiment, the weak point is a groove 31 formed by recessing at least one end face of the explosion-proof sheet 3. That is, the groove 31 can be provided on the outer end face of the explosion-proof sheet 3, or on the inner end face of the explosion-proof sheet 3, or simultaneously on both the outer and inner end faces of the explosion-proof sheet 3.

[0064] Of course, this embodiment is merely an example of the specific location of the notch 31, but it does not limit the scope of the embodiment. Those skilled in the art can make changes according to the actual situation, as long as the same technical effect can be achieved.

[0065] Furthermore, in an optional embodiment, the distance between the notch 31 and the reinforcing part 22 is L2mm, where L2 satisfies: 1≤L2≤3.

[0066] For example, L2 can be 1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 3, etc. Of course, this embodiment is merely an example of a specific value for L2, and 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.

[0067] Secondly, this utility model also provides a battery housing, which includes an outer shell and a cover structure as described in any of the above embodiments. The outer shell is provided with a receiving cavity, and the cover structure is provided with a cover body 1, which is disposed on the outer shell and closes the opening of the receiving cavity.

[0068] Thirdly, this utility model also provides a battery device, which includes a cell assembly and a battery housing as described in the above embodiments. The battery housing is provided with a receiving cavity, in which the cell assembly is adapted to be installed.

[0069] 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 cover plate structure for a battery, characterized in that, include: The cover plate body (1) has a through hole; A reinforcing component (2) is disposed circumferentially at the edge of the through hole and surrounds the mounting hole (21). An explosion-proof sheet (3) is disposed in the mounting hole (21) and completely covers the mounting hole (21); the explosion-proof sheet (3) is used to release pressure after the internal pressure of the battery reaches a certain level; The reinforcing component (2) includes: A reinforcing part (22) protrudes from the top of the cover plate body (1), and the reinforcing part (22) is disposed circumferentially at the edge of the through hole; A buffer portion (23) is provided at the bottom of the cover plate body (1) and recesses into the top of the cover plate body (1) to form a groove; the buffer portion (23) is provided at least partially corresponding to the reinforcing portion (22).

2. The cover plate structure according to claim 1, characterized in that, The reinforcing part (22) is recessed on the side near the mounting hole (21) to form a mounting part. The mounting part has a stepped structure. The mounting part is at least provided on the side of the reinforcing part (22) near the mounting hole (21). The mounting part includes at least a first step (221). The first step (221) is arranged around the periphery of the mounting hole (21).

3. The cover plate structure according to claim 2, characterized in that, The height of the first step (221) is H1mm, and H1 satisfies: 0.3≤H1≤1.

4. The cover plate structure according to claim 3, characterized in that, The length of the first step (221) is D1mm, and D1 satisfies: 1.5≤D1≤2.

2.

5. The cover plate structure according to any one of claims 1 to 4, characterized in that, The depth of the groove is H2mm, where H2 satisfies: 0.3≤H2≤1.

5.

6. The cover plate structure according to claim 5, characterized in that, The width of the groove is D2mm, where D2 satisfies: 0.5≤D2≤5.

7. The cover plate structure according to any one of claims 2 to 4, characterized in that, The explosion-proof sheet (3) is installed on the first step (221) of the stepped structure and is attached to the bottom edge of the explosion-proof sheet (3).

8. The cover plate structure according to claim 7, characterized in that, The step surface of the first step (221) at least partially coincides with the bottom edge of the explosion-proof sheet (3).

9. The cover plate structure according to claim 8, characterized in that, Along the horizontal direction, the overlap distance between the step surface and the explosion-proof sheet (3) is L1mm, and L1 satisfies: 1.5≤L1≤1.

9.

10. The cover plate structure according to claim 8 or 9, characterized in that, The edge of the explosion-proof sheet (3) is welded to the step to form a weld line, the weld line width is D3mm, D3 satisfies: 0.3≤D3≤1.5; and / or, the weld line depth is H3mm, H3 satisfies: 0.3≤H3≤1.

11. The cover plate structure according to claim 2, characterized in that, The mounting part further includes a second step (222), which is located between the reinforcing part (22) and the first step (221). The step surface of the second step (222) is located between the top surface of the reinforcing part (22) and the step surface of the first step (221).

12. The cover plate structure according to claim 11, characterized in that, The height of the second step (222) is H4mm, and H4 satisfies: 0.4≤H4≤1.

13. The cover plate structure according to claim 11, characterized in that, The length of the second step (222) is D4mm, and D4 satisfies: 0.4≤D4≤1.

14. The cover plate structure according to claim 1, characterized in that, The height of the reinforcing part (22) protruding relative to the surface of the cover plate body (1) is H5mm, and H5 satisfies: 0.4≤H5≤2.

15. The cover plate structure according to claim 1, characterized in that, The explosion-proof sheet (3) is provided with a weak part, which is used to be punctured when the internal pressure of the battery reaches a certain level to achieve pressure relief.

16. The cover plate structure according to claim 15, characterized in that, The weak part is a groove (31) formed by a recess on at least one end face of the explosion-proof sheet (3).

17. The cover plate structure according to claim 16, characterized in that, The distance between the groove (31) and the reinforcing part (22) is L2mm, where L2 satisfies: 1≤L2≤3.

18. The cover plate structure according to claim 1, characterized in that, The width of the groove is not less than the width of the reinforcing part (22).

19. A battery casing, characterized in that, include: The outer casing has a receiving cavity; The cover structure as described in any one of claims 1 to 18 includes a cover body (1) disposed on the outer shell and sealing the opening of the receiving cavity.

20. A battery device, characterized in that, include: Battery cell assembly; The battery casing as claimed in claim 19 is provided with a receiving cavity; the receiving cavity is adapted to install the battery cell assembly.

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