A battery

Abstract

The application provides a battery, comprising a top cover assembly and a battery core, wherein the top cover assembly comprises an explosion-proof valve, a top cover sheet and a lower plastic, the explosion-proof valve is fixedly connected with the top cover sheet, and the lower plastic is fixedly connected with the top cover sheet. Part of the lower plastic is recessed in a direction away from the explosion-proof valve to form a first recess, and a projection of the explosion-proof valve is located within a projection of the first recess along a thickness direction of the lower plastic. The battery core is in abutment with a side of the bottom of the first recess away from the explosion-proof valve. In the first recess, a first reinforcing rib is arranged along a width direction of the lower plastic, two ends of the first reinforcing rib being connected with a first side wall; and a second reinforcing rib is arranged along a length direction, two ends of the second reinforcing rib being connected with a second side wall. Along the thickness direction, the two reinforcing ribs protrude from the bottom of the first recess, and the height of the two ends of the second reinforcing rib is greater than that of a middle part. The structure enhances the strength and buffering property of the lower plastic, reduces direct impact of the battery core extrusion on the explosion-proof valve under a battery drop working condition, reduces the risk of breakage of the explosion-proof valve, guarantees the valve opening function, and improves the drop safety and reliability of the battery.

Description

Technical Field

[0001] This application relates to the field of energy storage equipment technology, and mainly to a battery. Background Technology

[0002] As the core component of an energy storage system, the rationality of the battery's structural design directly affects its safety and reliability.

[0003] The common plastic structure under batteries usually supports the core through three locations: the left and right sides and the middle explosion-proof valve. However, due to the large mass of the energy storage cell, when the explosion-proof valve is dropped downwards, the downward impact force of the cell will force the plastic to squeeze the explosion-proof valve. This squeezing will cause the explosion-proof valve to rupture, thus causing the safety hazard of valve failure. Utility Model Content

[0004] In view of the problems existing in the background technology, this application provides a battery to solve the safety hazard that the impact force generated when the battery cell falls downwards will force the lower plastic to squeeze the explosion-proof valve, causing the explosion-proof valve to break and thus causing the valve to fail to open.

[0005] To solve the above problems, this application is implemented as follows:

[0006] This application provides a battery, which includes a top cover assembly and a battery cell; the top cover assembly includes an explosion-proof valve, a top cover sheet, and a lower plastic sheet, wherein the explosion-proof valve is fixedly connected to the top cover sheet, and the lower plastic sheet is fixedly connected to the top cover sheet;

[0007] The lower plastic portion is recessed in the direction away from the explosion-proof valve to form a first groove. Along the thickness direction of the lower plastic, the projection of the explosion-proof valve on the top cover plate is located within the projection of the first groove on the top cover plate of Susonghu. The battery cell abuts against the side of the bottom of the first groove away from the explosion-proof valve. A first through hole is provided at the bottom of the first groove.

[0008] The first groove has a first sidewall and a second sidewall. The first sidewall is a sidewall facing each other along the width direction of the lower plastic, and the second sidewall is a sidewall facing each other along the length direction of the lower plastic. In the first groove, a first reinforcing rib is provided along the width direction of the lower plastic, and the two ends of the first reinforcing rib are respectively connected to the first sidewall. A second reinforcing rib is provided along the length direction of the lower plastic, and the two ends of the second reinforcing rib are respectively connected to the second sidewall.

[0009] Along the thickness direction of the lower plastic, the first reinforcing rib and the second reinforcing rib protrude from the bottom of the first groove, and the height of both ends of the first reinforcing rib and the second reinforcing rib is greater than the height of the middle part.

[0010] Optionally, the end of the second reinforcing rib that connects to the second sidewall is the first end, and the projection of the first end onto the first sidewall is trapezoidal along the width direction of the lower plastic.

[0011] Along the length of the lower plastic, the height of the trapezoid decreases from the side closer to the second sidewall toward the side of the central axis of the first groove.

[0012] Optionally, a second groove is provided at the bottom of the first groove, and the second groove is recessed towards the side away from the explosion-proof valve along the thickness direction of the lower plastic.

[0013] The second groove is disposed between the two first reinforcing ribs. The second groove is elongated and is arranged parallel to the first reinforcing ribs.

[0014] Optionally, the second groove has a third sidewall and a fourth sidewall, wherein the third sidewall is a sidewall opposite to each other along the width direction of the lower plastic, and the fourth sidewall is a sidewall opposite to each other along the length direction of the lower plastic.

[0015] In the second groove, a third reinforcing rib is provided along the width direction of the lower plastic, and the two ends of the third reinforcing rib are connected to the third sidewall. A fourth reinforcing rib is provided along the length direction of the lower plastic, and the two ends of the fourth reinforcing rib are connected to the fourth sidewall.

[0016] Optionally, along the thickness direction of the lower plastic, the projection of the first reinforcing rib at the bottom of the second groove coincides with the projection of the fourth sidewall at the bottom of the second groove;

[0017] Along the thickness direction of the lower plastic, the height of the third reinforcing rib and the fourth reinforcing rib is H1, the height of the fourth sidewall is H2, and the height of the first reinforcing rib is H3, where H1 = H2 + H3.

[0018] Optionally, the top cover assembly further includes a protective cover disposed between the explosion-proof valve and the second groove, the bottom of the protective cover abutting against the second reinforcing rib and the first reinforcing rib.

[0019] Optionally, a second through hole is provided at the bottom of the protective cover.

[0020] Optionally, along the thickness direction of the lower plastic, the first sidewall and the second sidewall are inclined from the end near the explosion-proof valve to the end away from the explosion-proof valve, from the direction away from the central axis of the first groove to the direction near the central axis of the first groove.

[0021] Optionally, the lower plastic includes a first lower plastic and a second lower plastic;

[0022] Along the length of the lower plastic, the first lower plastic and the second lower plastic are arranged side by side. The first lower plastic has a second protrusion on the side closer to the second lower plastic, and the second lower plastic has a third protrusion on the side closer to the first lower plastic.

[0023] Along the thickness direction of the lower plastic, the distance between the third boss and the explosion-proof valve is smaller than the distance between the second boss and the explosion-proof valve, so that the third boss can overlap the second boss.

[0024] Optionally, at least a portion of the first groove is located on the first lower plastic, and another portion of the first groove is located on the second lower plastic;

[0025] The first lower plastic and the second lower plastic overlap to form the first groove.

[0026] The battery in this application features a first groove in the lower plastic that protrudes from the main body and is away from the explosion-proof valve. This groove, along with the interlaced first and second reinforcing ribs at the bottom of the groove, effectively enhances the structural strength and cushioning performance of the lower plastic. Simultaneously, the height of the two ends of the second reinforcing rib is greater than the height of the middle section, providing sufficient space for the deformation of the lower plastic after impact with the battery cell. This reduces the likelihood of the lower plastic being directly squeezed by the battery cell, significantly lowering the risk of explosion-proof valve rupture, ensuring the normal operation of the battery's valve opening function, and effectively improving the safety and reliability of the battery under drop conditions. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments or related technologies of this application, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of a battery according to this application;

[0029] Figure 2 This is a schematic diagram of the battery top cover assembly in this application;

[0030] Figure 3 This is a schematic diagram of the lower plastic component in this application;

[0031] Figure 4 This is an enlarged view of the lower plastic part I in this application;

[0032] Figure 5 This is a cross-sectional view of the lower plastic along the thickness direction in this application;

[0033] Figure 6 This is an enlarged view of the lower plastic part II in this application;

[0034] Figure 7 A schematic diagram showing the installation of a protective cover between the lower plastic part and the explosion-proof valve in this application;

[0035] Figure 8 This is a schematic diagram showing that the depth of the second groove in this application is not greater than the thickness of the bottom of the first groove.

[0036] Explanation of reference numerals in the attached figures:

[0037] 1. Top cover assembly; 2. Battery cell; 11. Explosion-proof valve; 12. Top cover plate; 13. Lower plastic; 14. Protective cover; 141. Second through hole; 131. First groove; 1311. First through hole; 1312. First side wall; 1313. Second side wall; 1314. First reinforcing rib; 1315. Second reinforcing rib; 1316. Second groove; 13161. Third side wall; 13162. Fourth side wall; 13163. Third reinforcing rib; 13164. Fourth reinforcing rib; 132. First lower plastic; 1321. Second boss; 133. Second lower plastic; 1331. Third boss; First end; 13151. Detailed Implementation

[0038] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this application or its application or use. Based on the embodiments of this application, any product that is the same as or similar to this application, derived by anyone under the guidance of this application or by combining features of this application with other related technologies, falls within the protection scope of this application. Furthermore, all other embodiments obtained by those skilled in the art without inventive effort are within the protection scope of this application.

[0039] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of this application specification.

[0040] Furthermore, the technical features involved in the different embodiments of this application described below can be combined with each other as long as they do not conflict with each other.

[0041] like Figure 1 , Figure 2 and Figure 3As shown, this application embodiment provides a battery, which includes a top cover assembly 1 and a battery cell 2; the top cover assembly 1 includes an explosion-proof valve 11, a top cover sheet 12, and a lower plastic 13, the explosion-proof valve 11 is fixedly connected to the top cover sheet 12, and the lower plastic 13 is fixedly connected to the top cover sheet 12; a portion of the lower plastic 13 is recessed in the direction away from the explosion-proof valve 11 to form a first groove 131, and along the thickness direction of the lower plastic 13, the projection of the explosion-proof valve 11 on the top cover sheet 12 is located within the projection of the first groove 131 on the top cover sheet 13, and a first through hole 1311 is provided at the bottom of the first groove 131; the first groove 131 has a first sidewall 1312 and a second sidewall 1313, the first sidewall 1312 being along the thickness direction of the lower plastic 13. The width direction of the lower plastic 13 has opposite sidewalls, and the second sidewall 1313 has opposite sidewalls along the length direction of the lower plastic 13. In the first groove 131, along the width direction of the lower plastic 13, a first reinforcing rib 1314 is provided, and the two ends of the first reinforcing rib 1314 are respectively connected to the first sidewall 1312. Along the length direction of the lower plastic 13, a second reinforcing rib 1315 is provided, and the two ends of the second reinforcing rib 1315 are respectively connected to the second sidewall 1313. Along the thickness direction of the lower plastic 13, the first reinforcing rib 1314 and the second reinforcing rib 1315 protrude from the bottom of the first groove 131, and the height of the two ends of the first reinforcing rib 1314 and the second reinforcing rib 1315 is greater than the height of the middle part.

[0042] Specifically, the battery includes a top cover assembly 1 and a battery cell 2. The top cover assembly 1 is disposed at one end of the battery cell 2. The top cover assembly 1 includes an explosion-proof valve 11, a top cover sheet 12, and a lower plastic sheet 13. The explosion-proof valve 11 is fixedly connected to one side of the top cover sheet 12, and the lower plastic sheet 13 is fixedly connected to the other side of the top cover sheet 12. The explosion-proof valve 11 and the top cover sheet 12 can be fixedly connected by laser welding or resistance welding. This application embodiment does not limit its specific connection method. The lower plastic sheet 13 and the top cover sheet 12 can be connected by insulating adhesive or snap fasteners. This application embodiment does not limit its specific connection method.

[0043] A portion of the lower plastic 13 is recessed in the direction away from the explosion-proof valve 11 to form a first groove 131. Along the thickness direction of the lower plastic 13, the projected size of the first groove 131 is larger than the projected size of the explosion-proof valve 11, and the projected size of the explosion-proof valve 11 is located within the projected size of the first groove 131, so that the lower plastic 13 does not contact the explosion-proof valve 11. Simultaneously, the battery cell 2 abuts against the bottom of the first groove 131 on the side away from the explosion-proof valve 11. A first through hole 1311 is provided at the bottom of the first groove 131. During the operation of the battery cell 2, gas is generated inside the battery due to chemical reactions or temperature changes. The first through hole 1311 can serve as a channel for gas flow, preventing excessive local gas accumulation that could lead to abnormal pressure. When the explosion-proof valve 11 is triggered due to excessive internal pressure, the first through hole 1311 can assist in the rapid discharge of gas through the explosion-proof valve 11, improving the response efficiency of the explosion-proof system. The first through hole 1311 may include multiple holes arranged at intervals; the specific number is not limited in this embodiment.

[0044] The first groove 131 includes a first sidewall 1312 disposed opposite to each other along the width direction of the lower plastic 13 and a second sidewall 1313 disposed opposite to each other along the length direction of the lower plastic 13. The interior of the first groove 131 is provided with a first reinforcing rib 1314 and a second reinforcing rib 1315. The first reinforcing rib 1314 is disposed along the width direction of the lower plastic 13 and its two ends are respectively connected to the first sidewall 1312. The second reinforcing rib 1315 is disposed along the length direction of the lower plastic 13 and its two ends are respectively connected to the second sidewall 1313, so that the first reinforcing rib 1314 and the second reinforcing rib 1315 are arranged in a crisscross pattern at the bottom of the first groove 131. Meanwhile, along the thickness direction of the lower plastic 13, the first reinforcing rib 1314 and the second reinforcing rib 1315 protrude from the bottom of the first groove 131, and their protrusion value is less than the depth of the first groove 131. The height of the two ends of the second reinforcing rib 1315 is greater than the height of the middle part. In some embodiments, the height of the two ends of the second reinforcing rib 1315 is the same as the depth of the first groove 131, so that the two ends of the second reinforcing rib 1315 abut against the periphery of the explosion-proof valve 11. The height of the middle part of the first reinforcing rib 1314 and the second reinforcing rib 1315 is less than the height of the two ends, so that along the thickness direction of the lower plastic 13, the projection of the explosion-proof valve 11 is located in the recessed area between the first reinforcing rib 1314 and the second reinforcing rib 1315, and the two maintain a safe distance from each other and will not collide with the explosion-proof valve 11, so as to prevent the lower plastic 13 from hitting the explosion-proof valve 11 when the battery falls, causing the explosion-proof valve 11 to break.

[0045] Understandably, by optimizing the structure of the lower plastic 13, the problem of the energy storage cell 2 being squeezed by the explosion-proof valve 11 during a drop is effectively solved. The first groove 131 of the lower plastic 13 provides sufficient space for the explosion-proof valve 11. Together with the second reinforcing rib 1315, whose height at both ends is greater than that in the middle, and the first reinforcing rib 1314 arranged laterally, a stable support structure for the cell 2 is formed. This allows the impact force of the cell 2 to be mainly borne by the reinforcing ribs, preventing the lower plastic 13 from directly squeezing the explosion-proof valve 11. At the same time, the height difference design of the reinforcing ribs ensures that a safe distance is maintained between the explosion-proof valve 11 and the lower plastic 13, preventing the two from colliding during a drop and causing the explosion-proof valve 11 to break, thus ensuring the normal function of the explosion-proof valve 11. In addition, the first through hole 1311 can assist the internal gas flow of the battery and improve the response efficiency of the explosion-proof valve 11. Thus, while enhancing the structural strength of the lower plastic 13 to stably support the cell 2, the safety and reliability of the battery are significantly improved.

[0046] Optionally, such as Figure 2 , Figure 3 As shown, the end of the second reinforcing rib 1315 that connects to the second sidewall 1313 is the first end 13151. Along the width direction of the lower plastic 13, the projection of the first end 13151 on the first sidewall 1312 is a trapezoid. Along the length direction of the lower plastic 13, the height of the trapezoid decreases from the side closer to the second sidewall 1313 toward the side of the central axis of the first groove 131.

[0047] Specifically, along the width direction of the lower plastic 13, the end where the second reinforcing rib 1315 connects to the second sidewall 1313 is the first end 13151. The first end 13151 has a trapezoidal structure. When the outline of the trapezoid extends from the side near the second sidewall 1313 toward the central axis of the first groove 131, its height in the thickness direction of the lower plastic 13 gradually decreases, forming a gradual transition shape from the edge to the center. This makes the connection area between the end of the second reinforcing rib 1315 and the second sidewall 1313 form a natural force transmission path, and the hypotenuse of the trapezoid smoothly connects with the inner sidewall of the second sidewall 1313, avoiding right angle or acute angle transitions.

[0048] Understandably, the trapezoidal structure and decreasing height design of the first end 13151 can disperse the stress generated by the impact of the battery cell 2 through the sloping structure of the trapezoid, avoiding stress concentration at the connection between the second reinforcing rib 1315 and the second sidewall 1313, which could lead to breakage. At the same time, the gradual change in height can ensure that the structural height on the side closer to the central axis of the first groove 131 is lower, further reserving sufficient space for the explosion-proof valve 11 and preventing interference between the end of the reinforcing rib and the explosion-proof valve 11. Meanwhile, the smooth transition shape of the trapezoid can optimize the injection molding process of the lower plastic 13, reduce mold dead corners and molding defects, and improve structural stability. Thus, while enhancing the impact resistance of the lower plastic 13, it can continuously ensure the safety function of the explosion-proof valve 11.

[0049] Optionally, such as Figure 3 , Figure 4 and Figure 5 As shown, a second groove 1316 is provided at the bottom of the first groove 131. Along the thickness direction of the lower plastic 13, the second groove 1316 is recessed towards the side away from the explosion-proof valve 11. The battery cell 2 abuts against the side of the second groove 1316 away from the explosion-proof valve 11. The second groove 1316 is disposed between two first reinforcing ribs 1314. The second groove 1316 is elongated and is arranged parallel to the first reinforcing ribs 1314.

[0050] Specifically, at the bottom of the first groove 131, a second groove 1316 is formed by recessing along the thickness direction of the lower plastic 13 towards the side away from the explosion-proof valve 11. The second groove 1316 is elongated and parallel to the first reinforcing rib 1314, and is located exactly in the area between the two first reinforcing ribs 1314. One end of the second reinforcing rib 1315 can be connected to the second sidewall 1313, and the other end can be connected to the first reinforcing ribs 1314 on both sides of the second groove 1316.

[0051] In some embodiments, such as Figure 5 With the bottom of the first groove 131 as the reference plane, the second groove 1316 protrudes to the side away from the explosion-proof valve 11. When the battery cell 2 is installed, the end of the battery cell 2 abuts against the side of the second groove 1316 away from the explosion-proof valve 11, so that the pressure of the battery cell 2 is concentrated on the protruding part of the second groove 1316. The first reinforcing rib 1314 provides lateral support to the second groove 1316 from both sides. This structure can reduce the contact area between the bottom of the first groove 131 and the battery cell 2, reduce the amount of material used while ensuring the support strength, and enhance the deformation resistance of the lower plastic 13 through the cooperation of the reinforcing rib and the groove, effectively avoiding the risk of the lower plastic 13 deforming and squeezing the explosion-proof valve 11 when falling, thus improving battery safety.

[0052] In other embodiments, such as Figure 8Along the thickness direction of the lower plastic, the thickness of the bottom of the first groove 131 is greater than the depth of the second groove 1316. The second groove 1316 is a recess on the side away from the explosion-proof valve 11 from the bottom of the first groove 131. When the battery cell 2 is installed, the end of the battery cell 2 abuts against the side of the bottom of the first groove 131 away from the explosion-proof valve 11. The end of the battery cell directly abuts against the area with sufficient thickness at the bottom of the first groove 131, resulting in a larger contact area. This allows for the even distribution of the weight of the battery cell and the impact force of vibration, avoiding local pressure concentration that could cause deformation of the lower plastic. The recessed design of the second groove 1316 creates an additional buffer space between the bottom of the first groove 131 and the explosion-proof valve 11. Even if the lower plastic is slightly deformed by external force, the deformation direction will preferentially be released towards the recessed side away from the explosion-proof valve 11. Furthermore, the sufficient thickness at the bottom of the first groove 131 ensures the rigidity of the core support area, improving the reliability of long-term use.

[0053] Understandably, the design of the second groove 1316, by recessing it towards the side away from the explosion-proof valve 11, further increases the spatial distance between the explosion-proof valve 11 and the lower plastic 13, preventing the pressure from the battery cell 2 when in contact from being transmitted to the explosion-proof valve 11 area. The parallel arrangement of the elongated structure and the first reinforcing rib 1314 can adapt to the outline of the battery cell 2, allowing the impact force of the battery cell 2 to be more evenly distributed on the second groove 1316 and the first reinforcing ribs 1314 on both sides, improving the support stability of the lower plastic 13 for the battery cell 2.

[0054] Optionally, such as Figure 3 , Figure 4 and Figure 5 As shown, the second groove 1316 includes a third sidewall 13161 and a fourth sidewall 13162. The third sidewall 13161 is a sidewall facing each other along the width direction of the lower plastic 13, and the fourth sidewall 13162 is a sidewall facing each other along the length direction of the lower plastic 13. In the second groove 1316, a third reinforcing rib 13163 is provided along the width direction of the lower plastic 13, and the two ends of the third reinforcing rib 13163 are connected to the third sidewall 13161. A fourth reinforcing rib 13164 is provided along the length direction of the lower plastic 13, and the two ends of the fourth reinforcing rib 13164 are connected to the fourth sidewall 13162.

[0055] Specifically, the third sidewall 13161 of the second groove 1316 consists of two opposing sidewalls along the width direction of the lower plastic 13, and the fourth sidewall 13162 consists of two opposing sidewalls along the length direction of the lower plastic 13. Inside the second groove 1316, a third reinforcing rib 13163 is provided along the width direction, with its two ends fixedly connected to the third sidewalls 13161 on both sides. A fourth reinforcing rib 13164 is provided along the length direction, with its two ends fixedly connected to the fourth sidewalls 13162 on both sides. This makes the third reinforcing ribs 13163 and the fourth reinforcing ribs 13164 arranged in a crisscrossing grid pattern inside the second groove 1316, together forming a support structure for the bottom of the second groove 1316.

[0056] Understandably, the crisscrossing third reinforcing ribs 13163 and fourth reinforcing ribs 13164 within the second groove 1316 further enhance the structural strength and deformation resistance of the bottom of the second groove 1316, effectively dispersing the pressure generated when the battery cell 2 contacts the groove, and preventing the second groove 1316 from deforming due to excessive force. Simultaneously, the mesh-like reinforcing rib structure can evenly transmit the impact force of the battery cell 2 to the third sidewall 13161 and fourth sidewall 13162, reducing local stress concentration and preventing cracking of the sidewalls or bottom of the second groove 1316. This ensures the contact stability between the battery cell 2 and the lower plastic 13, indirectly reducing the risk of the lower plastic 13 deforming and squeezing the explosion-proof valve 11, further enhancing the structural reliability and safety of the battery.

[0057] Optionally, such as Figure 6 As shown, along the thickness direction of the lower plastic 13, the projection of the first reinforcing rib 1314 at the bottom of the second groove 1316 coincides with the projection of the fourth sidewall 13162 at the bottom of the second groove 1316; along the thickness direction of the lower plastic 13, the heights of the third reinforcing rib 13163 and the fourth reinforcing rib 13164 are both H1, the height of the fourth sidewall 13162 is H2, and the height of the first reinforcing rib 1314 is H3, where H1 = H2 + H3.

[0058] Specifically, along the thickness direction of the lower plastic 13, the projection of the first reinforcing rib 1314 at the bottom of the second groove 1316 completely overlaps with the projection of the fourth sidewall 13162 at the bottom of the second groove 1316, that is, the extension line of the first reinforcing rib 1314 in the width direction of the lower plastic 13 is aligned with the edge of the fourth sidewall 13162. In the height direction of the lower plastic 13, the height by which the third reinforcing rib 13163 and the fourth reinforcing rib 13164 protrude upward from the bottom of the second groove 1316 is H1, the height by which the fourth sidewall 13162 extends upward from the bottom of the second groove 1316 is H2, and the height by which the first reinforcing rib 1314 protrudes upward from the bottom of the first groove 131 is H3, and H1 is equal to the sum of H2 and H3, so that the tops of the third reinforcing rib 13163 and the fourth reinforcing rib 13164 are on the same plane as the top of the first reinforcing rib 1314, forming a continuous support structure.

[0059] Understandably, the projections of the first reinforcing rib 1314 and the fourth sidewall 13162 coincide, ensuring that they are aligned on the force transmission path, avoiding stress concentration caused by structural misalignment, and enhancing the overall deformation resistance of the lower plastic 13. H1 = H2 + H3, so that the third reinforcing rib 13163, the fourth reinforcing rib 13164, the fourth sidewall 13162, and the first reinforcing rib 1314 form a continuous force transmission hierarchy. The impact force of the battery cell 2 can be smoothly transmitted through the third reinforcing rib 13163, the fourth reinforcing rib 13164, and the fourth sidewall 13162 to the first reinforcing rib 1314, and then dispersed to the sidewall of the first groove 131, realizing uniform force transmission, effectively avoiding local structural overload damage, and precisely controlling the distance between each component and the explosion-proof valve 11, further ensuring the stability and safety of the battery structure.

[0060] Optionally, such as Figure 7 As shown, the top cover assembly 1 also includes a protective cover 14, which is disposed between the explosion-proof valve 11 and the second groove 1316. The bottom of the protective cover 14 abuts against the second reinforcing rib 1315 and the first reinforcing rib 1314.

[0061] Specifically, the protective cover 14 in the top cover assembly 1 is frame-shaped and is entirely disposed within the space between the explosion-proof valve 11 and the second groove 1316. The bottom edge of the protective cover 14 abuts against the first reinforcing rib 1314 and the second reinforcing rib 1315. Along the thickness direction of the lower plastic 13, the projection of the explosion-proof valve 11 is located within the projection of the protective cover 14, so that the sidewall of the protective cover 14 is located outside the explosion-proof valve 11, avoiding contact between the sidewall of the protective cover 14 and the explosion-proof valve 11. At the same time, the bottom of the explosion-proof valve 11 is located in the recessed position in the middle of the second reinforcing rib 1315. The first reinforcing rib 1314 and the second reinforcing rib 1315 provide stable support for the protective cover 14, forming a physical barrier outside the explosion-proof valve 11, and maintaining a certain gap between the protective cover 14 and the explosion-proof valve 11, without directly contacting the body of the explosion-proof valve 11. The protective cover 14 can be made of aluminum or aluminum alloy, and this embodiment does not limit its specific material.

[0062] Understandably, the protective cover 14 is fixed between the explosion-proof valve 11 and the second groove 1316 by the support of the first reinforcing rib 1314 and the second reinforcing rib 1315. It can prevent debris and protrusions that may be generated when the battery cell 2 or the lower plastic 13 deforms from directly impacting the explosion-proof valve 11. It can also buffer the pressure transmitted by the lower plastic 13 through its own structure when the battery is subjected to severe impact (such as a drop), so as to prevent the lower plastic 13 from directly squeezing the explosion-proof valve 11. At the same time, the protective cover 14 does not directly contact the explosion-proof valve 11 and will not affect the normal opening function of the explosion-proof valve 11. It further provides double protection for the explosion-proof valve 11, greatly reduces the risk of accidental breakage or failure of the explosion-proof valve 11, and improves the safety redundancy of the battery.

[0063] Optionally, such as Figure 7 As shown, a second through hole 141 is provided at the bottom of the protective cover 14.

[0064] Specifically, the bottom of the protective cover 14 has multiple second through holes 141. These through holes are spaced apart along the length and width of the protective cover 14, and their positions avoid contact with the areas of the first reinforcing rib 1314 and the second reinforcing rib 1315, ensuring that the support contact between the bottom of the protective cover 14 and the reinforcing rib is not affected. The shape of the second through holes 141 is adapted to the first through holes 1311, forming a vertically connected channel, allowing the gas generated inside the battery to flow sequentially through the first through holes 1311 and the second through holes 141 to the explosion-proof valve 11.

[0065] Understandably, the second through hole 141 at the bottom of the protective cover 14 can cooperate with the first through hole 1311 to form a continuous gas flow path, ensuring that the gas inside the battery can smoothly reach the explosion-proof valve 11, and ensuring that the explosion-proof valve 11 can respond and release pressure in time when the pressure is too high, so as to avoid gas accumulation due to obstruction by the protective cover 14.

[0066] Optionally, along the thickness direction of the lower plastic 13, the first sidewall 1312 and the second sidewall 1313 are inclined from the end near the explosion-proof valve 11 to the end away from the explosion-proof valve 11, from the direction away from the central axis of the first groove 131 to the direction near the central axis of the first groove 131.

[0067] Specifically, along the thickness direction of the lower plastic 13, the first sidewall 1312 and the second sidewall 1313 of the first groove 131 are both inclined: as they extend from the end near the explosion-proof valve 11 to the end away from the explosion-proof valve 11, the two sidewalls gradually converge toward the central axis of the first groove 131, forming a funnel-shaped structure that is wider on the outside and narrower on the inside. The inclination angle of the sidewalls transitions smoothly without obvious bends.

[0068] Understandably, the inclined design of the first sidewall 1312 and the second sidewall 1313 can disperse and transfer the lateral force of the battery cell 2 to the overall structure of the lower plastic 13 through the inclined surface when the battery cell 2 abuts against the bottom of the first groove 131 or when the battery is impacted, thus avoiding stress concentration at the connection between the sidewall and the bottom of the groove and enhancing the deformation resistance of the lower plastic 13.

[0069] Optionally, such as Figure 5 As shown, the lower plastic 13 includes a first lower plastic 132 and a second lower plastic 133; along the length direction of the lower plastic 13, the first lower plastic 132 and the second lower plastic 133 are arranged side by side, a second protrusion 1321 is provided on the side of the first lower plastic 132 near the second lower plastic 133, and a third protrusion 1331 is provided on the side of the second lower plastic 133 near the first lower plastic 132; along the thickness direction of the lower plastic 13, the distance of the third protrusion 1331 from the explosion-proof valve 11 is smaller than the distance of the second protrusion 1321 from the explosion-proof valve 11, so that the third protrusion 1331 can overlap the second protrusion 1321.

[0070] Specifically, the lower plastic 13 is composed of a first lower plastic 132 and a second lower plastic 133 joined together, arranged side by side along the length of the lower plastic 13. The first lower plastic 132 has a second protrusion 1321 extending downwards along the length of the lower plastic 13 on its edge near the second lower plastic 133, and the second lower plastic 133 has a third protrusion 1331 extending outwards on its edge near the first lower plastic 132. Along the thickness direction of the lower plastic 13, the third protrusion 1331 is located closer to the explosion-proof valve 11 than the second protrusion 1321, so that when the first lower plastic 132 and the second lower plastic 133 are joined, the third protrusion 1331 can precisely overlap the second protrusion 1321, forming an overlapping connection structure.

[0071] Understandably, dividing the lower plastic 13 into a split design of a first lower plastic 132 and a second lower plastic 133 simplifies the molding process of individual components and reduces the processing difficulty of complex structures. Furthermore, the overlapping fit between the second boss 1321 and the third boss 1331 ensures a stable overall structure after splicing, preventing excessive gaps or misalignment. Simultaneously, the overlapping structure enhances the lower plastic 13's tensile and shear resistance along its length, reducing deformation at the splice point when the battery is impacted. This ensures the stability of the lower plastic 13's support for the battery cell 2, indirectly reducing the risk of the explosion-proof valve 11 being squeezed and improving the overall structural reliability.

[0072] Optionally, such as Figure 5 As shown, at least a portion of the first groove 131 is located on the first lower plastic 132, and another portion of the first groove 131 is located on the second lower plastic 133; the first lower plastic 132 and the second lower plastic 133 overlap to form the first groove 131.

[0073] Specifically, the first groove 131 is formed by a first lower plastic 132 and a second lower plastic 133. A portion of the first groove 131 (including the first sidewall 1312, the second sidewall 1313, and part of the bottom of the corresponding area) is located on the first lower plastic 132, and another portion (including the first sidewall 1312, the second sidewall 1313, and part of the bottom of the corresponding area) is located on the second lower plastic 133. When the first lower plastic 132 and the second lower plastic 133 are joined together by the second boss 1321 and the third boss 1331, the two parts of the structure are joined together to form a complete first groove 131. The second groove 1316 can be located on either the first lower plastic 132 or the second lower plastic 133.

[0074] Understandably, the first groove 131 is formed by the splicing of the first lower plastic 132 and the second lower plastic 133. This retains the advantage of the separate lower plastic 13 being easy to process, while ensuring the integrity of the first groove 131 through the splicing structure. At the same time, the tight fit at the joint allows the force of the groove to be shared by the two parts of plastic, improving the overall deformation resistance of the groove and ensuring the support stability when the battery cell 2 is in contact. Furthermore, the splicing structure can disperse the stress at the bottom of the groove, reducing the risk of breakage due to excessive local stress, and further ensuring the structural safety of the area where the explosion-proof valve 11 is located.

[0075] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

Claims

1. A battery, characterized in that, The battery includes a top cover assembly (1) and a cell (2); the top cover assembly (1) includes an explosion-proof valve (11), a top cover plate (12) and a lower plastic (13), the explosion-proof valve (11) is fixedly connected to the top cover plate (12), and the lower plastic (13) is fixedly connected to the top cover plate (12); The lower plastic (13) portion is recessed in the direction away from the explosion-proof valve (11) to form a first groove (131). Along the thickness direction of the lower plastic (13), the projection of the explosion-proof valve (11) on the top cover plate (12) is located within the projection of the first groove (131) on the top cover plate (12). A first through hole (1311) is provided at the bottom of the first groove (131). The first groove (131) has a first sidewall (1312) and a second sidewall (1313). The first sidewall (1312) is a sidewall facing each other along the width direction of the lower plastic (13), and the second sidewall (1313) is a sidewall facing each other along the length direction of the lower plastic (13). In the first groove (131), a first reinforcing rib (1314) is provided along the width direction of the lower plastic (13), and the two ends of the first reinforcing rib (1314) are respectively connected to the first sidewall (1312). A second reinforcing rib (1315) is provided along the length direction of the lower plastic (13), and the two ends of the second reinforcing rib (1315) are respectively connected to the second sidewall (1313). Along the thickness direction of the lower plastic (13), the first reinforcing rib (1314) and the second reinforcing rib (1315) protrude from the bottom of the first groove (131), and the heights at both ends of the first reinforcing rib (1314) and the second reinforcing rib (1315) are greater than the height of the middle part.

2. The battery according to claim 1, characterized in that, The end of the second reinforcing rib (1315) that connects to the second sidewall (1313) is the first end (13151). Along the width direction of the lower plastic (13), the projection of the first end (13151) on the first sidewall (1312) is trapezoidal. Along the length of the lower plastic (13), the height of the trapezoid decreases from the side near the second sidewall (1313) toward the side of the central axis of the first groove (131).

3. The battery according to claim 1, characterized in that, The bottom of the first groove (131) is provided with a second groove (1316), and along the thickness direction of the lower plastic (13), the second groove (1316) is recessed to the side away from the explosion-proof valve (11); The second groove (1316) is disposed between the two first reinforcing ribs (1314). The second groove (1316) is elongated and is disposed parallel to the first reinforcing ribs (1314).

4. The battery according to claim 3, characterized in that, The second groove (1316) has a third sidewall (13161) and a fourth sidewall (13162), wherein the third sidewall (13161) is a sidewall opposite to the lower plastic (13) in the width direction, and the fourth sidewall (13162) is a sidewall opposite to the lower plastic (13) in the length direction. In the second groove (1316), a third reinforcing rib (13163) is provided along the width direction of the lower plastic (13), and the two ends of the third reinforcing rib (13163) are connected to the third sidewall (13161). A fourth reinforcing rib (13164) is provided along the length direction of the lower plastic (13), and the two ends of the fourth reinforcing rib (13164) are connected to the fourth sidewall (13162).

5. The battery according to claim 4, characterized in that, Along the thickness direction of the lower plastic (13), the projection of the first reinforcing rib (1314) at the bottom of the second groove (1316) coincides with the projection of the fourth sidewall (13162) at the bottom of the second groove (1316); Along the thickness direction of the lower plastic (13), the height of the third reinforcing rib (13163) and the fourth reinforcing rib (13164) is H1, the height of the fourth sidewall (13162) is H2, and the height of the first reinforcing rib (1314) is H3, H1 = H2 + H3.

6. The battery according to claim 3, characterized in that, The top cover assembly (1) also includes a protective cover (14), which is disposed between the explosion-proof valve (11) and the second groove (1316). The bottom of the protective cover (14) abuts against the second reinforcing rib (1315) and the first reinforcing rib (1314).

7. The battery according to claim 6, characterized in that, The bottom of the protective cover (14) is provided with a second through hole (141).

8. The battery according to claim 1, characterized in that, Along the thickness direction of the lower plastic (13), the first sidewall (1312) and the second sidewall (1313) are inclined from the end near the explosion-proof valve (11) to the end away from the explosion-proof valve (11), from the direction away from the central axis of the first groove (131) to the direction near the central axis of the first groove (131).

9. The battery according to claim 1, characterized in that, The lower plastic (13) includes a first lower plastic (132) and a second lower plastic (133); Along the length of the lower plastic (13), the first lower plastic (132) and the second lower plastic (133) are arranged side by side. The first lower plastic (132) is provided with a second boss (1321) on the side closer to the second lower plastic (133), and the second lower plastic (133) is provided with a third boss (1331) on the side closer to the first lower plastic (132). Along the thickness direction of the lower plastic (13), the distance between the third boss (1331) and the explosion-proof valve (11) is smaller than the distance between the second boss (1321) and the explosion-proof valve (11), so that the third boss (1331) can overlap the second boss (1321).

10. The battery according to claim 9, characterized in that, At least a portion of the first groove (131) is located on the first lower plastic (132), and another portion of the first groove (131) is located on the second lower plastic (133); The first lower plastic (132) and the second lower plastic (133) overlap to form the first groove (131).

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