Battery cell cover plate and battery

Abstract

The utility model relates to a battery field provides a kind of battery and electric core cover plate.Electric core cover plate includes lower plastic;Cover plate body, the first side surface of cover plate body is installed in lower plastic, the second side surface of cover plate body is formed with the first boss portion and second boss portion that protrude towards the direction away from lower plastic, first boss portion and second boss portion are at least two layers respectively;Explosion-proof valve, installed in cover plate body and located between first boss portion and second boss portion, the position corresponding with explosion-proof valve on cover plate body is provided with reinforcing structure.The electric core cover plate can reduce the inclination of explosion-proof valve installation area caused by boss portion deformation in charge-discharge cycle;Further improve the anti-deformation ability of cover plate body around explosion-proof valve, avoid the bending of thin cover plate body to pass to explosion-proof valve, protect the sealing of its welded edge;The multilayer design of double boss portion increases the heat dissipation area, improves the heat exchange efficiency of cover plate body and water-cooled plate.

Description

Technical Field

[0001] This utility model relates to the field of batteries, and provides a cell cover plate and a battery. Background Technology

[0002] In current battery cell manufacturing technology, to achieve a better fit between the cell cover and the upper water-cooling plate of the cell pack, some designs employ the method of creating raised bumps on the cover. After welding the external connecting pieces, these bumps can make tight contact with the upper water-cooling plate. To achieve this design and ensure sufficient thickness for the installation of other necessary components, the substrate thickness of other parts of the cover is typically reduced during the creation of the bumps. This design approach has gained some acceptance in practical applications, but it also faces some challenges.

[0003] Especially during actual use, particularly during charge-discharge cycles, the bulge can deform. This deformation significantly weakens the resistance of the flat portion that originally supports the explosion-proof valve to deformation under external forces. Particularly since the explosion-proof valve is welded to a relatively thin cover plate, the force caused by deformation, when transmitted to the valve, leads to more frequent fatigue during opening and closing, directly affecting its breathing function and lifespan. Utility Model Content

[0004] This utility model provides a battery cell cover plate to solve the defect in related technologies where heat dissipation and anti-fatigue performance of explosion-proof valves cannot be guaranteed at the same time.

[0005] This utility model provides a battery.

[0006] The first aspect of this utility model provides a battery cell cover plate, comprising: Plastic bottom; The cover plate body has a first side mounted on the lower plastic, and a second side formed with a first boss portion and a second boss portion protruding in a direction away from the lower plastic, wherein the first boss portion and the second boss portion are each at least two layers. An explosion-proof valve is installed on the cover plate body and located between the first boss portion and the second boss portion. A reinforcing structure is provided on the cover plate body at the position corresponding to the explosion-proof valve.

[0007] According to one embodiment of the present invention, the height of the first boss portion is equal to the height of the second boss portion, and along the thickness direction of the cover plate body, the top surface of the first boss portion is higher than the top surface of the pole post.

[0008] According to one embodiment of the present invention, the height H of the first boss portion is ≥ 2 mm.

[0009] According to one embodiment of the present invention, the reinforcing structure is formed on at least one side of the explosion-proof valve along its length.

[0010] According to one embodiment of the present invention, the reinforcing structure is formed on at least one side of the explosion-proof valve in the width direction.

[0011] According to one embodiment of the present invention, the reinforcing structure is formed on at least one side of the explosion-proof valve in the length and width directions.

[0012] According to one embodiment of the present invention, the reinforcing structure includes a protrusion formed on the cover plate body, the protrusion protruding in a direction away from the lower plastic.

[0013] According to one embodiment of the present invention, the reinforcing structure includes a recessed portion formed on the cover plate body, the recessed portion being recessed toward the lower plastic.

[0014] According to one embodiment of the present invention, the cover plate body is provided with a mounting hole, the explosion-proof valve is installed in the mounting hole, and a protective patch is provided on the side of the explosion-proof valve away from the mounting hole.

[0015] A second aspect of this utility model provides a battery, including a housing, on which a cell cover plate as described above is mounted.

[0016] According to the first aspect of the present invention, the symmetrical layout of the first and second protrusions in the battery cell cover plate disperses the stress on the cover plate body, reducing the tilting of the explosion-proof valve installation area caused by the deformation of the protrusions during charge and discharge cycles. The surrounding reinforcing structures (protrusions or recesses) further enhance the deformation resistance of the cover plate body around the explosion-proof valve, preventing the bending of the thin cover plate body from being transmitted to the explosion-proof valve and protecting the sealing of its welded edges. The reinforcing structures reduce the reciprocating stress on the explosion-proof valve in the battery cell breathing effect (pressure fluctuations during charge and discharge) by enhancing local rigidity, thus reducing the probability of fatigue cracks. This allows the explosion-proof valve to withstand more pressure cycles, maintain stable opening and closing performance, and extend its effective service life. The multi-layer design of the double protrusions increases the heat dissipation area and improves the heat exchange efficiency between the cover plate body and the water-cooling plate. At the same time, the explosion-proof valve is located in an independent area between the protrusions, which, together with the reinforcing structures, enhances heat dissipation without sacrificing the safety performance of the explosion-proof valve, achieving synergistic optimization of both. The stable performance of the explosion-proof valve ensures the safe pressure relief of the battery cell under abnormal pressure, reducing the risk of battery cell scrapping due to explosion-proof valve failure; the synergistic effect of the boss and the reinforcing structure reduces the overall deformation of the cover plate, maintains the stability of the internal structure of the battery cell, and indirectly extends the cycle life of the battery cell.

[0017] According to the battery provided in the second aspect of this utility model, the rigid connection between the casing and the cell cover plate fixes the positions of the first and second protrusions, reducing deformation of the protrusions due to vibration or impact. Combined with the reinforcing structure, this further mitigates the impact of cover plate deformation on the explosion-proof valve. The clearance space reserved in the casing ensures that the explosion-proof valve can quickly release pressure in case of abnormal pressure, preventing casing rupture due to pressure accumulation and enhancing battery safety redundancy. The casing provides rigid support for the cell cover plate, making the symmetrical layout of the first and second protrusions more stable, reducing cover plate distortion caused by cell expansion and contraction during charge and discharge cycles, and indirectly protecting the weld sealing of the explosion-proof valve. The synergistic effect of the reinforcing structure and the casing reduces the stress fatigue of the explosion-proof valve under the breathing effect, extending its effective service life. The heat dissipation design of the first and second protrusions and the casing forms a three-dimensional heat dissipation system, effectively reducing the cell operating temperature and minimizing the aging effects of high temperatures on the electrolyte and electrode materials. The stable performance of the explosion-proof valve ensures the safe survival of the battery under abnormal operating conditions, reducing premature battery failure due to safety component failure and extending the overall cycle life. The standardized fit design of the casing and cell cover allows for automated assembly (such as laser welding), improving production efficiency. The clearly defined layout of the protrusions and explosion-proof valves on the cell cover facilitates verification of the valve installation quality via visual inspection or pressure testing after battery assembly, reducing maintenance complexity. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a schematic perspective view of the battery cell cover plate provided by this utility model.

[0020] Figure 2 This is a schematic exploded view of the battery cell cover plate provided by this utility model.

[0021] Figure 3 This is a schematic top view of the first type of battery cell cover provided by this utility model.

[0022] Figure 4 This is a schematic top view of the second type of battery cell cover provided by this utility model.

[0023] Figure 5 This is a schematic top view of the third type of battery cell cover provided by this utility model.

[0024] Figure 6 This is a schematic top view of the fourth type of battery cell cover provided by this utility model.

[0025] Figure 7 This is a schematic enlarged view of the explosion-proof valve and protective patch provided by this utility model.

[0026] Figure 8 This is a schematic enlarged view of the first reinforcing structure provided by this utility model.

[0027] Figure 9 This is a schematic enlarged view of the second reinforcing structure provided by this utility model.

[0028] Figure 10 This is a schematic enlarged view of the third reinforcing structure provided by this utility model.

[0029] Figure 11 This is a schematic enlarged view of the fourth reinforcing structure provided by this utility model.

[0030] Figure 12 This is a schematic enlarged view of the fifth reinforcing structure provided by this utility model.

[0031] Figure 13 This is a schematic enlarged view of the sixth reinforcing structure provided by this utility model.

[0032] Figure label: 100. Lower plastic part; 102. Cover plate body; 104. First boss part; 106. Second boss part; 108. Explosion-proof valve; 110. Reinforcing structure; 112. Mounting hole; 114. Protective patch; 116. Terminal post. Detailed Implementation

[0033] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0034] like Figures 1 to 13 As shown, the first aspect of this utility model provides a battery cell cover plate, comprising: 100g of plastic; The cover plate body 102 has a first side mounted on the lower plastic 100, and the second side of the cover plate body 102 has a first boss portion 104 and a second boss portion 106 protruding in a direction away from the lower plastic 100. The first boss portion 104 and the second boss portion 106 are at least two layers. An explosion-proof valve 108 is installed on the cover plate body 102 and located between the first boss portion 104 and the second boss portion 106. A reinforcing structure 110 is provided on the cover plate body 102 at a position corresponding to the explosion-proof valve 108.

[0035] According to the battery cell cover plate provided in the first aspect embodiment of this utility model, the symmetrical arrangement of the first boss portion 104 and the second boss portion 106 disperses the stress of the cover plate body 102, reducing the tilting of the installation area of ​​the explosion-proof valve 108 caused by the deformation of the boss portion during charge and discharge cycles; the peripheral reinforcing structure 110 (protrusion or recess) further enhances the deformation resistance of the cover plate body 102 around the explosion-proof valve 108, preventing the bending of the thin cover plate body 102 from being transmitted to the explosion-proof valve 108, and protecting the sealing of its welded edges. The reinforcing structure 110 reduces the reciprocating force on the explosion-proof valve 108 in the battery cell breathing effect (pressure fluctuation during charge and discharge) by enhancing local rigidity, reducing the probability of fatigue crack formation. This allows the explosion-proof valve 108 to withstand more pressure cycles, maintain stable opening and closing performance, and extend its effective service life. The multi-layered design of the double-protrusion section increases the heat dissipation area and improves the heat exchange efficiency between the cover plate body 102 and the water-cooling plate. Simultaneously, the explosion-proof valve 108 is located in an independent area between the protrusions, working in conjunction with the reinforcing structure 110 to enhance heat dissipation without sacrificing the safety performance of the explosion-proof valve 108, achieving synergistic optimization. The stable performance of the explosion-proof valve 108 ensures safe pressure relief of the battery cell under abnormal pressure, reducing the risk of battery cell failure due to the failure of the explosion-proof valve 108. The synergistic effect of the protrusions and the reinforcing structure 110 reduces the overall deformation of the cover plate, maintains the stability of the internal structure of the battery cell, and indirectly extends the cycle life of the battery cell.

[0036] Please continue reading Figures 1 to 13 The battery cell cover provided in the first aspect of this utility model balances heat dissipation efficiency and the stability of the explosion-proof valve 108 through the layout of the double protrusion and the reinforcement design around the explosion-proof valve 108.

[0037] The lower plastic 100 is made of insulating and high-temperature resistant material (such as PBT+glass fiber). After injection molding, it covers the first side (bottom) of the cover plate body 102. Only the first boss part 104, the second boss part 106 and the explosion-proof valve 108 are reserved to avoid space, so as to ensure insulation and isolation without obstructing the protruding structure.

[0038] The cover plate body 102 is made of high thermal conductivity aluminum alloy. The first side is tightly attached to the lower plastic 100, and the second side (top surface) is stamped to form at least two raised first boss 104 and second boss 106. The two are symmetrically distributed along the length of the cover plate body 102, with a flat area reserved in the middle for installing the explosion-proof valve 108. The protrusion direction of the bosses is away from the lower plastic 100, and the layered structure is achieved through a stepped transition.

[0039] The explosion-proof valve 108 is a metal film or composite diaphragm structure. It is fixed to the flat area of ​​the cover plate body 102 between the first protrusion 104 and the second protrusion 106 by laser welding. Its burst pressure is preset to the cell safety threshold and can rupture and release pressure when the internal pressure is abnormal.

[0040] The reinforcing structure 110 is arranged around the edge of the explosion-proof valve 108, and includes the following forms: Protrusion: A rib that protrudes from the surface of the cover plate body 102 away from the lower plastic 100, distributed along the length direction, width direction or a combination of both of the explosion-proof valve 108, integrally stamped with the cover plate body 102, and the height does not exceed the protrusion.

[0041] Recessed portion: A groove that is recessed from the surface of the cover plate body 102 toward the lower plastic 100, forming a closed or semi-closed structure around the explosion-proof valve 108, and improving rigidity by locally thickening the material.

[0042] The first boss 104 and the second boss 106 are at the same height, ensuring a flat contact surface with the external water-cooling plate. They are symmetrically distributed around the explosion-proof valve 108, ensuring balanced stress on the cover plate body 102 and reducing unilateral deformation. The design of two or more bosses increases the contact area with the water-cooling plate and provides independent installation space for the explosion-proof valve 108, avoiding structural interference between the bosses and the explosion-proof valve 108.

[0043] According to one embodiment of the present invention, the height of the first protrusion 104 is equal to the height of the second protrusion 106, and along the thickness direction of the cover plate body 102, the top surface of the first protrusion 104 is higher than the top surface of the pole post 116.

[0044] In one embodiment of this utility model, the first boss portion 104 and the second boss portion 106 are symmetrically designed, with their heights being completely identical. They are formed using the same stamping die to ensure dimensional uniformity. Along the thickness direction (protrusion direction) of the cover plate body 102, the top surfaces of the first boss portion 104 and the second boss portion 106 are on the same plane, and this plane is higher than the top surface of the pole post 116 (including the outer connecting piece), forming a stepped height difference. The pole post 116 is installed in the non-bore area of ​​the cover plate body 102. After its top end is welded to the outer connecting piece, its overall height is lower than the top surface of the boss portion, and the distance between their edges is adapted to the installation space of the explosion-proof valve 108.

[0045] The design of the raised portion above the pole post 116 ensures that the area where the explosion-proof valve 108 is located is unobstructed, allowing for rapid pressure relief to the outside of the battery cell in case of abnormal pressure, avoiding incomplete pressure relief caused by obstruction by the pole post 116 or connecting piece. The equal height of the first and second raised portions 106 ensures uniform contact pressure with the water-cooling plate, avoiding poor local heat dissipation due to height differences. At the same time, the layout above the pole post 116 prioritizes cooling for the area of ​​the explosion-proof valve 108, reducing the impact of high temperature on its performance. The symmetrical raised portions ensure balanced force on the cover plate body 102, reducing the tilting of the explosion-proof valve 108 caused by unilateral deformation during charge and discharge cycles, protecting its weld seal, and maintaining stable burst pressure.

[0046] According to one embodiment of the present invention, the height H of the first boss portion 104 is ≥ 2 mm.

[0047] In one embodiment of this utility model, the height of the first boss 104 is not less than 2 mm, and the second boss 106 is the same (because they are of equal height). Both are formed with sufficient protrusion through a stamping process. The height of the boss is measured from the reference surface of the second side of the cover plate body 102. The wall thickness of the protrusion is the same as that of the base material of the cover plate body 102, and the root is connected to the main body of the cover plate body 102 through an arc transition to avoid stress concentration. This height design ensures that the boss can form effective contact with the external water-cooling plate, while reserving sufficient installation and pressure relief space for the explosion-proof valve 108.

[0048] Sufficient height allows the boss to fit tightly against the water-cooling plate, reducing thermal resistance caused by contact gaps, accelerating the transfer of heat from the cover plate body 102 to the cooling system, and lowering the cell operating temperature. A height of H≥2 mm makes the boss form a "support column" structure, improving the overall rigidity of the cover plate body 102, reducing cover plate deformation caused by internal pressure or external impact, and indirectly protecting the stability of the explosion-proof valve 108.

[0049] According to one embodiment of the present invention, a reinforcing structure 110 is formed on at least one side of the explosion-proof valve 108 along its length.

[0050] In one embodiment of this utility model, the reinforcing structure 110 is a rib extending along the length of the explosion-proof valve 108, and is provided at least on one side of the explosion-proof valve 108 (it can be symmetrically distributed on one or both sides). The rib is integrally stamped with the cover plate body 102, protrudes in a direction away from the lower plastic 100, has a height flush with the first and second boss portions 106, and a length covering more than 80% of the length of the explosion-proof valve 108. The edge is smoothly connected to the cover plate body 102 and does not overlap with the welding area of ​​the explosion-proof valve 108.

[0051] The ribs enhance the rigidity of the cover plate body 102 along the length of the explosion-proof valve 108, reducing the stretching or contraction in this direction caused by the breathing effect during charge and discharge cycles. This prevents fatigue stress at the welded edges of the explosion-proof valve 108 and extends its service life. The ribs also distribute the deformation stress of the cover plate body 102 to the rib area, reducing the force directly acting on the explosion-proof valve 108, protecting its sealing performance, and maintaining stable burst pressure parameters. Located on the side of the explosion-proof valve 108, the ribs do not cover its pressure relief channel, ensuring that the explosion-proof valve 108 can rupture smoothly and release pressure in the event of abnormal pressure.

[0052] According to one embodiment of the present invention, a reinforcing structure 110 is formed on at least one side of the explosion-proof valve 108 in the width direction.

[0053] In one embodiment of this utility model, the reinforcing structure 110 is a protrusion or recess distributed along the width direction of the explosion-proof valve 108, and is provided on at least one side of the explosion-proof valve 108 (it can be single-sided or double-sided). If it is a protruding structure, its width is slightly larger than the width of the explosion-proof valve 108, and it protrudes away from the lower plastic 100; if it is a recessed structure, its depth is 1 / 3 to 1 / 2 of the thickness of the cover plate body 102, and it penetrates through both sides of the explosion-proof valve 108 along the width direction. Both types of reinforcing structures 110 are integrally formed with the cover plate body 102, maintaining a small gap with the edge of the explosion-proof valve 108.

[0054] The design effectively resists bending deformation of the cover plate body 102 in the width direction of the explosion-proof valve 108, reduces the tilting of the mounting plane of the explosion-proof valve 108 caused by the expansion or contraction of the battery cell, and protects its weld sealing. Structural reinforcement ensures uniform stress distribution in the width direction, preventing premature failure caused by excessive localized stress on the explosion-proof valve 108 and improving its fatigue resistance. The reinforcement design in the width direction does not extend beyond the edge of the cover plate body 102, avoiding assembly interference with the housing or other components and ensuring the installation compatibility of the battery cell cover plate.

[0055] According to one embodiment of the present invention, a reinforcing structure 110 is formed on at least one side of the explosion-proof valve 108 in the length and width directions.

[0056] In one embodiment of this utility model, the reinforcing structure 110 forms an "L"-shaped or rectangular frame around the explosion-proof valve 108, covering at least one side in both the length and width directions. Ribs in the length direction extend along both ends of the explosion-proof valve 108, and ribs in the width direction are distributed along both sides of the explosion-proof valve 108, smoothly connecting at the corners to form a closed reinforcing area. The height of the frame protrusion is consistent with the boss portion, and the inner edge maintains a uniform distance from the explosion-proof valve 108, without affecting its welding and pressure relief functions.

[0057] The rigidity of the cover plate body 102 surrounding the explosion-proof valve 108 is simultaneously strengthened in both length and width directions to resist deformation caused by multi-directional stress, comprehensively reduce the stress fatigue of the explosion-proof valve 108, and improve its long-term operational stability. The frame-type reinforcement restricts the deformation of the cover plate body 102 to the outside of the frame, protecting the flatness of the installation area of ​​the explosion-proof valve 108 and maintaining its initial burst pressure accuracy. The one-piece molded frame structure requires no additional assembly steps, enhancing performance without increasing production complexity, making it suitable for mass production.

[0058] According to one embodiment of the present invention, the reinforcing structure 110 includes a protrusion formed on the cover plate body 102, the protrusion protruding in a direction away from the lower plastic 100.

[0059] In one embodiment of this utility model, the protrusion is a strip-shaped or mesh-like structure protruding outward (away from the lower plastic 100) from the surface of the cover plate body 102, and is formed using the same stamping process as the first and second boss portions 106. The cross-section of the protrusion is semi-circular or rectangular, and its height does not exceed that of the boss portion. It is distributed around the periphery of the explosion-proof valve 108 (e.g., in the length or width direction), maintaining a safe distance from the welding edge of the explosion-proof valve 108 to avoid contact interference.

[0060] By increasing the material density, the cover plate body 102 around the explosion-proof valve 108 is strengthened to improve its bending resistance, reduce deformation caused by the thin substrate, alleviate tensile forces on the explosion-proof valve 108, and protect its welding stability. The raised portion increases the contact area with the water-cooling plate, which can quickly transfer heat from the explosion-proof valve 108 area to the cooling system, reducing the impact of high temperature on the material properties of the explosion-proof valve 108. The obvious raised contour can serve as an alignment mark during the installation of the explosion-proof valve 108, improving the positioning accuracy of the welding process and ensuring installation quality.

[0061] According to one embodiment of the present invention, the reinforcing structure 110 includes a recess formed on the cover plate body 102, the recess being recessed toward the lower plastic 100.

[0062] In one embodiment of this utility model, the recessed portion is a groove recessed inward from the surface of the cover plate body 102 (near the lower plastic 100), formed around the explosion-proof valve 108 by a stamping process. The depth is 1 / 3 to 1 / 2 of the thickness of the cover plate body 102, and the width is adapted to the edge size of the explosion-proof valve 108. The recessed portion can be distributed along the length direction, width direction, or a combination of both of the explosion-proof valve 108, forming a closed or semi-closed ring, and its inner edge does not touch the welding area of ​​the explosion-proof valve 108.

[0063] The recessed portion causes the material of the cover plate body 102 to concentrate at the periphery, forming a "reinforcing rib" effect, improving the deformation resistance around the explosion-proof valve 108 and reducing fatigue damage caused by the breathing effect. Compared with the protruding portion, the recessed portion strengthens the structure without increasing the overall height, avoiding interference with external components, and reducing material usage, which is in line with the trend of lightweight battery cells. The recessed portion can serve as a pre-set deformation buffer area, so that the expansion and contraction of the cover plate body 102 mainly occurs in the recessed area, reducing the impact on the installation area of ​​the explosion-proof valve 108 and protecting its performance stability.

[0064] According to one embodiment of the present invention, a mounting hole 112 is provided on the cover plate body 102, and an explosion-proof valve 108 is installed in the mounting hole 112, and a protective patch 114 is provided on the side of the explosion-proof valve 108 away from the mounting hole 112.

[0065] In one embodiment of this utility model, the mounting hole 112 penetrates through the thickness direction of the cover plate body 102 and is located between the first boss portion 104 and the second boss portion 106. The hole diameter matches the outer diameter of the explosion-proof valve 108, and a transition fit is used to ensure that the explosion-proof valve 108 is tightly installed. The explosion-proof valve 108 is fixed in the mounting hole 112 by laser welding, and the welded edge surrounds its outer periphery to form a seal. The protective patch 114 is a high-temperature resistant insulating film (such as polyimide material), which covers the side of the explosion-proof valve 108 away from the mounting hole 112 (i.e., the side facing outward) by adhesive bonding. Its area is slightly larger than that of the explosion-proof valve 108, and its edge extends to the surface of the cover plate body 102.

[0066] Mounting hole 112 provides a precise positioning reference for explosion-proof valve 108. Combined with welding fixation, this ensures its stable position on cover plate body 102, reducing displacement caused by vibration or deformation. Protective patch 114 isolates explosion-proof valve 108 from external components (such as water-cooled plates), preventing surface damage from contact friction and preventing dust, moisture, and other impurities from affecting its performance. The insulating protective patch 114 blocks the conductive path between explosion-proof valve 108 (metal material) and external conductive components, avoiding short-circuit risks without affecting the explosion-proof valve 108's burst pressure relief function (the patch can break along with the explosion-proof valve 108).

[0067] A second aspect of this utility model provides a battery, including a housing, on which a cell cover plate as described above is mounted.

[0068] According to the battery provided in the second aspect embodiment of this utility model, the rigid connection between the casing and the cell cover plate fixes the positions of the first and second protrusions 106, reducing the deformation of the protrusions due to vibration or impact. Combined with the reinforcing structure 110, this further mitigates the impact of the cover plate body 102 deformation on the explosion-proof valve 108. The clearance space reserved in the casing ensures that the explosion-proof valve 108 can quickly release pressure in case of abnormal pressure, avoiding casing rupture caused by pressure accumulation and enhancing the battery's safety redundancy. The casing provides rigid support for the cell cover plate, making the symmetrical layout of the first and second protrusions 106 more stable, reducing cover plate distortion caused by cell expansion and contraction during charge and discharge cycles, and indirectly protecting the weld sealing of the explosion-proof valve 108. The synergistic effect of the reinforcing structure 110 and the casing reduces the stress fatigue of the explosion-proof valve 108 under the breathing effect, extending its effective service life. The heat dissipation design of the first and second protrusions 106 and the casing forms a three-dimensional heat dissipation system, effectively reducing the cell operating temperature and reducing the aging effects of high temperature on the electrolyte and electrode materials. The stable performance of the explosion-proof valve 108 ensures the safe survival of the battery under abnormal operating conditions, reduces premature battery failure due to safety component malfunction, and extends the overall cycle life. The standardized fit design of the casing and cell cover allows for automated assembly (such as laser welding), improving production efficiency. The clear layout of the protrusions on the cell cover and the explosion-proof valve 108 facilitates verification of the valve's installation quality through visual inspection or pressure testing after battery assembly, reducing maintenance difficulty.

[0069] The battery provided in the second aspect of this utility model forms a complete energy storage device by adapting the casing to the cell cover plate with the structure of two layers of convex bulges and explosion-proof valve 108.

[0070] The casing is made of metal (such as aluminum alloy) or high-strength engineering plastic and is a hollow cavity with one open end, housing wound or stacked battery cells, electrolyte, and insulating diaphragm. An annular sealing groove is provided at the edge of the casing opening, and a liquid-tight connection is achieved with the edge of the battery cell cover plate via laser welding or sealant to prevent electrolyte leakage.

[0071] The cell cover plate adopts the structure described in the above embodiment, including a lower plastic 100, a cover plate body 102, a first protrusion 104, a second protrusion 106, an explosion-proof valve 108, and a reinforcing structure 110. The cell cover plate is installed at the opening end of the housing. The lower plastic 100 is bonded to the inner wall of the housing to form an insulating barrier. The first protrusion 104 and the second protrusion 106 of the cover plate body 102 face outwards from the housing. The explosion-proof valve 108 is located between the two, and the reinforcing structure 110 is distributed around the explosion-proof valve 108.

[0072] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A battery cell cover plate, characterized in that, include: Plastic bottom; The cover plate body has a first side mounted on the lower plastic, and a second side formed with a first boss portion and a second boss portion protruding in a direction away from the lower plastic, wherein the first boss portion and the second boss portion are each at least two layers. An explosion-proof valve is installed on the cover plate body and located between the first boss portion and the second boss portion. A reinforcing structure is provided on the cover plate body at the position corresponding to the explosion-proof valve.

2. The cell cover plate according to claim 1, characterized in that, The height of the first protrusion is equal to the height of the second protrusion, and along the thickness direction of the cover plate body, the top surface of the first protrusion is higher than the top surface of the pole post.

3. The cell cover plate according to claim 2, characterized in that, The height H of the first boss is ≥ 2 mm.

4. The cell cover plate according to any one of claims 1 to 3, characterized in that, The reinforcing structure is formed on at least one side of the explosion-proof valve along its length.

5. The cell cover plate according to any one of claims 1 to 3, characterized in that, The reinforcing structure is formed on at least one side of the explosion-proof valve in the width direction.

6. The cell cover plate according to any one of claims 1 to 3, characterized in that, The reinforcing structure is formed on at least one side of the explosion-proof valve in the length and width directions.

7. The cell cover plate according to any one of claims 1 to 3, characterized in that, The reinforcing structure includes a protrusion formed on the cover plate body, the protrusion protruding away from the lower plastic.

8. The cell cover plate according to any one of claims 1 to 3, characterized in that, The reinforcing structure includes a recess formed on the cover plate body, the recess being recessed toward the lower plastic.

9. The cell cover plate according to any one of claims 1 to 3, characterized in that, The cover plate body has an installation hole, the explosion-proof valve is installed in the installation hole, and a protective patch is provided on the side of the explosion-proof valve away from the installation hole.

10. A battery, characterized in that, It includes a housing on which a cell cover plate as described in any one of claims 1 to 9 is mounted.

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