Battery cover plate assembly and battery

Abstract

The utility model relates to battery technical field provides a kind of battery cover plate assembly and battery, battery cover plate assembly includes: battery top cover, including top cover body and the two convex hull parts of the outward bulge on top cover body, top cover body is formed with explosion vent;Pole, it is set in top cover body, the height of each convex hull part outward bulge is greater than the height that pole exposes on top cover body;Explosion valve is set in explosion vent;In the length direction of top cover body, pole and explosion valve are between two convex hull parts.This battery cover plate assembly is set outward bulge and the two convex hull parts of height greater than pole exposure height, so that convex hull part becomes the highest point of cover top part.Avoid the force directly, concentratedly act on pole, thereby significantly reduce the risk that pole and its surrounding sealing structure fail due to pressure.At the same time pole and explosion valve are between two convex hull parts, play buffering and isolation effect.

Description

Technical Field

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

[0002] In existing battery cover assembly designs, the terminals typically protrude from the cover surface, becoming the highest point. When the top of the battery is subjected to external forces (such as compression or stacking), the pressure is concentrated on the terminals first. This can easily lead to connection failure between the terminals and the cover, causing the terminals to detach or insulation to fail, posing a serious safety hazard. Furthermore, the terminals and explosion-proof valves in existing battery cover assemblies are also susceptible to impact from external objects, causing physical damage and greatly increasing the risk of safety accidents. Utility Model Content

[0003] This utility model provides a battery cover assembly and a battery, which simultaneously solves the problems that the battery top cover terminals are easily subjected to external pressure, and that the terminals and explosion-proof valves are easily subjected to impacts from foreign objects, causing physical damage to the terminals and explosion-proof valves.

[0004] This utility model provides a battery cover assembly, including: A battery top cover includes a top cover body and two protruding portions on the top cover body, wherein an explosion-proof hole is formed on the top cover body. The pole is inserted into the top cover body, and the height of each of the protrusions is greater than the height of the pole exposed on the top cover body. An explosion-proof valve is installed in the explosion-proof hole; In the longitudinal direction of the top cover body, the pole and the explosion-proof valve are located between the two protruding portions.

[0005] According to the present invention, a battery cover assembly is provided in which two protrusions are provided for both the convex portion and the electrode post. Along the length of the top cover body, the two pole posts are located between the two protrusions, and the explosion-proof valve is disposed between the two pole posts.

[0006] According to the present invention, a battery cover assembly is provided, wherein the two terminals are a positive terminal and a negative terminal; Along the length of the top cover body, one of the convex portions, the positive electrode post, the explosion-proof valve, the negative electrode post, and the other convex portion are sequentially arranged.

[0007] According to the present invention, in the height direction of the top cover body, the convex portion protrudes outward from the top cover body by at least one layer. In the height direction of the top cover body, the sum of the outward protrusions of each layer of the convex portion is greater than the height of the pole exposed on the top cover body.

[0008] According to the present invention, a battery cover assembly is provided, wherein the convex portion includes a first convex portion and a second convex portion; The first convex bud protrudes outward from the top cover body, and the second convex bud continues to protrude outward from the first convex bud; In the height direction of the top cover body, the sum of the outward protrusions of the first convex bud and the second convex bud is greater than the height of the pole exposed on the top cover body.

[0009] According to the present invention, a battery cover assembly is provided in which a groove is formed on the inner side of the convex portion; The battery cover assembly also includes: An insulating element is disposed on the inner side of the top cover body and the protrusion. The insulating element has a recessed portion formed at the position corresponding to the groove. The recessed portion is embedded in the groove, and a receiving space is formed in the recessed portion. The receiving space is used to accommodate at least a portion of the battery tabs.

[0010] According to the present invention, the height difference h between the outward protrusion of the convex portion and the height of the electrode post exposed on the top cover body is 0.8mm≤h≤5mm.

[0011] In the height direction of the top cover body, the thickness of the top cover body and the convex part is t, 0.8mm≤t≤3mm.

[0012] According to the present invention, in the width direction of the top cover body, the distance from the edge of the convex portion to the edge of the top cover body is L, where 1.5×t (mm)≤L≤20mm.

[0013] According to the present invention, the width of the top cover body is C (mm) and the length of the top cover body is D (mm). In the width direction of the top cover body, the width of the convex portion is b, 5mm≤b≤C-2×(L+5mm). In the length direction of the top cover body, the total length of the two convex portions is a, 5mm≤a≤(D-65)mm.

[0014] This utility model also provides a battery, comprising: The battery housing, battery electrode assembly, and battery cover assembly are provided, wherein the battery electrode assembly is located inside the battery housing, and the battery cover assembly is fixed to the opening of the battery housing.

[0015] The battery cover assembly and battery provided by this utility model feature two outwardly protruding bulges, each with a height greater than the exposed height of the terminals, making these two bulges the highest points on the top of the cover. When the battery top cover is subjected to external force, the force is first borne by the bulges. This avoids the force being directly and concentrated on the terminals, thus significantly reducing the risk of failure of the terminals and their surrounding sealing structure due to pressure. Along the length of the top cover body, the terminals and the explosion-proof valve are positioned between the two bulges. For impacts from foreign objects that may sweep from the side or at an angle, the bulges can first contact and block the impact force, providing cushioning and isolation. This reduces the probability of foreign objects directly impacting, scratching, or puncturing the top of the terminals or the explosion-proof valve in the middle area. It also avoids the serious safety risk of premature rupture or failure of the explosion-proof valve due to accidental physical impact. Attached Figure Description

[0016] 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.

[0017] Figure 1 This is a three-dimensional structural diagram of the front of the battery cover assembly provided by this utility model.

[0018] Figure 2 This is a three-dimensional structural diagram of the back of the battery cover assembly provided by this utility model.

[0019] Figure 3 This is a disassembly diagram of the battery cover assembly provided by this utility model.

[0020] Figure 4 This is one of the main views of the battery cover assembly provided by this utility model.

[0021] Figure 5 yes Figure 4 A partial cross-sectional diagram at point AA.

[0022] Figure 6 This is the second front view of the battery cover assembly provided by this utility model.

[0023] Figure 7 yes Figure 6 A schematic diagram of the cross-section at point BB.

[0024] Figure 8 This is a three-dimensional structural diagram of the battery cover assembly provided by this utility model, which features a multi-layered convex portion.

[0025] Figure 9yes Figure 8 A cross-sectional schematic diagram of the battery cover assembly with multiple convex bulges.

[0026] Figure label: 1. Battery top cover; 11. Top cover body; 111. Explosion-proof hole; 12. Protrusion; 120. Groove; 121. First protrusion; 122. Second protrusion; 13. Explosion-proof valve; 2. Pole post; 3. Insulating component; 31. Recess; 310. Accommodating space. Detailed Implementation

[0027] In the description of the embodiments of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" 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. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model based on the specific circumstances.

[0029] In this embodiment of the utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0030] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. 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. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0031] The following is combined Figures 1-9 This invention describes the battery cover assembly and battery provided by this utility model.

[0032] This application provides a battery cover assembly, such as... Figures 1 to 4 As shown, the battery cover assembly includes: a battery top cover 1, a terminal post 2, and an explosion-proof valve 13. The battery top cover 1 includes a top cover body 11 and two protruding portions 12 on the top cover body 11. An explosion-proof hole 111 is formed on the top cover body 11. The terminal post 2 passes through the top cover body 11, and the height of the protrusion of each protrusion 12 is greater than the height of the terminal post 2 exposed on the top cover body 11. The explosion-proof valve 13 is disposed in the explosion-proof hole 111. In the length direction of the top cover body 11, the terminal post 2 and the explosion-proof valve 13 are located between the two protruding portions 12.

[0033] In this embodiment, the battery top cover 1 is formed by stamping a thin metal sheet, and the top cover body 11 is a rectangular top cover body 11. The thickness direction of the top cover body 11 is defined as the Z direction, the length direction as the X direction, and the width direction as the Y direction. The top cover body 11 has a through-hole explosion-proof hole 111 for the explosion-proof valve 13 to be embedded. Two protrusions 12 are stamped on the side of the top cover body 11 facing the outside of the battery (+Z direction). The protrusions 12 are elongated and extend along the X direction. Their longitudinal cross-section can be arc-shaped, trapezoidal, or multi-segmented zigzag to balance strength and performance. The terminal post 2 passes through the top cover body 11. Generally, the head of the terminal post 2 protrudes a certain height from the surface of the top cover body 11 in the +Z direction (or may not exceed the top cover body 11) to form a reliable electrical connection with the external busbar or power harness. On the +Z direction surface of the top cover body 11, two elongated protrusions 12 extending along the X direction are formed by stamping die. The Z-direction protrusion height of each convex portion 12 is precisely designed to be greater than the exposed height of the pole post 2, making the convex portion 12 the highest point of the entire cover assembly. The longitudinal cross-sectional profile of the convex portion 12 can be flexibly selected according to strength and space requirements. The elongated shape allows for a wider coverage area in the X-direction, which can quickly disperse lateral impact energy from any direction to the top cover body 11, preventing energy concentration in the pole post 2 area. From a spatial layout perspective, along the X-direction of the top cover body 11, the pole post 2 and the explosion-proof valve 13 are located between the two convex portions 12, forming a protective barrier for the pole post 2 and the explosion-proof valve 13.

[0034] Under normal operating conditions, this layout ensures that when the battery pack is stacked in the height direction, the two protrusions 12 make contact with the upper module first, preventing external forces from being directly transmitted to the terminal post 2, and significantly reducing the probability of microcracks or sealing failures caused by local pressure on the terminal post 2 and its sealing components.

[0035] Both the pole post 2 and the explosion-proof valve 13 are located within the "protected area" between the two protrusions 12. For foreign objects that may sweep past from the side or at an angle, the protrusions 12 act as a "barrier" to first contact the foreign object, causing plastic deformation and preventing it from continuing to slide, thus preventing sharp edges from scratching the pole post 2 or puncturing the explosion-proof valve 13.

[0036] The battery cover assembly provided by this utility model features two outwardly protruding bumps 12, each with a height greater than the exposed height of the terminal post 2, making these two bumps the highest points on the top of the cover. When the battery top cover 1 is subjected to external force, the force is first borne by the bumps 12. This avoids the force being directly and concentratedly applied to the terminal post 2, thus significantly reducing the risk of failure of the terminal post 2 and its surrounding sealing structure due to pressure. Along the length of the top cover body 11, the terminal post 2 and the explosion-proof valve 13 are positioned between the two bumps 12. For impacts from foreign objects that may sweep from the side or at an angle, the bumps 12 can first contact and block the impact force, providing buffering and isolation. This reduces the probability of foreign objects directly impacting, scratching, or puncturing the top of the terminal post 2 or the explosion-proof valve 13 in the middle area. It also avoids the serious safety risk of premature rupture or failure of the explosion-proof valve 13 due to accidental physical impact.

[0037] It should be noted that the pole post 2 may protrude from the top cover body 11 or may not protrude from the top cover body 11. The specific structure can be adjusted as needed, as long as the height of the protrusion of the convex part 12 is greater than the height of the pole post 2 exposed on the top cover body 11.

[0038] In some embodiments, such as Figures 1 to 4 As shown, both the convex portion 12 and the pole post 2 are provided in twos; in the length direction of the top cover body 11, the two pole posts 2 are located between the two convex portions 12, and the explosion-proof valve 13 is located between the two pole posts 2.

[0039] Specifically, two pole posts 2 are respectively inserted into the pole post 2 holes in the top cover body 11 in the X direction. Two protrusions 12 also extend in the X direction and are set on the outside of the two pole posts 2, forming a "double protrusion 12" layout. The explosion-proof valve 13 is sandwiched in the middle of the two pole posts 2, forming an arrangement of "protrusion 12, pole post 2, explosion-proof valve 13, pole post 2, protrusion 12".

[0040] When the battery pack is stacked or encounters bottom impact or stone impact, the impact force first acts on the top of the two protrusions 12. Since the protrusion height of the two protrusions 12 in the Z direction is greater than the heads of the two terminals 2, and the two protrusions 12 are located inside the terminals 2, the impact energy is quickly dispersed to the top cover body 11, and then attenuated to the surrounding area through the top cover body 11. The terminal 2 area is always in a low-stress zone that is "encased", which significantly reduces the probability of the terminals 2 and their sealing rings being crushed or developing micro-cracks.

[0041] The two terminals 2 are a positive terminal 2 and a negative terminal 2, respectively, used to form an electrical connection with an external line or busbar. Along the length of the top cover body 11, one of the protrusions 12, the positive terminal 2, the explosion-proof valve 13, the negative terminal 2, and the other protrusion 12 are arranged sequentially.

[0042] For foreign objects that may sweep from the side or at an angle, the two outer convex portions 12 act as "barriers" to first contact the foreign object, producing plastic deformation and preventing it from continuing to slide, thus preventing sharp edges from scratching the positive and negative terminals 2 or puncturing the explosion-proof valve 13.

[0043] In some embodiments, such as Figure 8 and Figure 9 As shown, in the height direction of the top cover body 11, the convex portion 12 protrudes outward from the top cover body 11 by at least one layer. In the height direction of the top cover body 11, the sum of the heights of each layer of the convex portion 12 protruding outward is greater than the height of the pole post 2 exposed on the top cover body 11.

[0044] In this embodiment, the convex portion 12 adopts a "multi-layer stepped" structure, with at least two layers (two layers shown in the figure, but three or more layers) gradually protruding outward from the outer surface of the top cover body 11. Each layer is formed by an independent stamping or rolling process, and adjacent layers are transitioned by an arc or a horizontal platform is provided, thereby forming a continuous stepped contour in the Z direction.

[0045] Through layered design, on the one hand, the bends or platforms formed between the layers can significantly improve the local section moment of inertia of the convex part 12, giving it higher bending and torsional strength when subjected to lateral impact or vertical extrusion; on the other hand, since the stamping depth of each layer is relatively small and the material is uniformly stretched, it can effectively avoid defects such as cracking and wrinkling that are prone to occur when deep drawing a single layer, thereby improving the yield.

[0046] In the Z-axis direction, the sum of the protrusion heights of all steps (i.e., the vertical distance from the apex of the outermost step to the outer surface of the top cover body 11) is precisely designed to be greater than the height of the terminal post 2 exposed on the top cover body 11, ensuring that the protrusion 12 is always the highest point of the cover assembly. Therefore, regardless of whether the battery pack is stacked in the height direction or encounters bottom ball impact or gravel impact, the impact force will first act on the outermost step of the multi-layer protrusion 12, and then be dispersed to the top cover body 11 through the steps, so that the terminal post 2 area is always in the protected low-stress safety zone.

[0047] Specifically, the convex portion 12 includes a first convex portion 121 and a second convex portion 122; the first convex portion 121 protrudes outward from the top cover body 11, and the second convex portion 122 continues to protrude outward from the first convex portion 121; in the height direction of the top cover body 11, the sum of the total outward protrusions of the first convex portion 121 and the second convex portion 122 is greater than the height of the pole post 2 exposed on the top cover body 11. The first convex portion 121 is directly stamped outward from the outer surface of the top cover body 11 to form a first height H1; the second convex portion 122 is stamped outward again on the top wall of the first convex portion 121 to form a second height H2; in the height direction (Z direction) of the top cover body 11, the total height sum of the two convex portions HΣ=H1+H2 is designed to always be greater than the height of the pole post 2 exposed on the top cover body 11, thereby ensuring that the apex of the second convex portion 122 becomes the highest point of the entire cover assembly.

[0048] When subjected to force, the external force of this double-layer stepped convex structure first acts on the top of the second convex 122, and the impact load is quickly transferred downward through its small contact area. The load is diffused through the second convex 122 to the first convex 121, and then further diffused through the first convex 121 to the top cover body 11, achieving two-stage buffering and energy dispersion. The pole post 2 area is always located below the two-stage convex convex, avoiding direct pressure and significantly reducing the risk of microcracks or seal failure in the pole post 2 and its seals.

[0049] In some embodiments, such as Figures 1 to 4 As shown, a groove is formed on the inner side of the convex portion 12; the battery cover assembly also includes: an insulating member 3, which is disposed on the inner side of the top cover body 11 and the convex portion 12. The insulating member 3 has a recessed portion 31 at the position corresponding to the groove. The recessed portion 31 is embedded in the groove, and a receiving space 310 is formed in the recessed portion 31. The receiving space 310 is used to receive at least part of the battery tabs, thereby significantly reducing the overall height occupation.

[0050] In this embodiment, a groove is formed on the inner side (i.e., the Z-direction) of each convex portion 12; the longitudinal section of the groove is U-shaped, Ω-shaped or trapezoidal, and the depth corresponds to the height of the convex portion 12, which not only preserves the mechanical height of the convex portion 12 in the +Z direction, but also borrows additional space inside it.

[0051] The battery cover assembly further includes an integrally injection-molded or compression-molded insulating member 3 (lower plastic), which covers the entire inner side of the top cover body 11 and extends upward to the inner sidewall of the protrusion 12. The insulating member 3 has an integrally formed downwardly protruding recess 31 at the position corresponding to each groove; the outer contour of the recess 31 is interference-fitted with the groove. The internal space of the recess 31 is defined as the receiving space 310. During assembly, the battery tabs can be inserted upward along the Z-direction into the recess 31 and finally connected to the base of the terminal post 2 by laser welding or ultrasonic welding. Since the recess 31 is embedded in the groove, at least a portion of the battery tabs can also be disposed in the receiving space 310, which can reduce the additional space occupied by the battery tabs below the cover in the Z-direction, thereby creating favorable conditions for improving battery energy density.

[0052] In this embodiment, an explosion-proof hole 111 is formed on the top cover body 11, penetrating the top cover body 11. A vent hole corresponding to the position of the explosion-proof hole 111 is formed on the insulating member 3. The explosion-proof hole 111 provides a pressure relief channel when the internal pressure of the battery is too high. The vent hole is located on the insulating member 3, corresponding to the position of the explosion-proof hole 111. The vent hole allows gas to escape when the explosion-proof valve 13 ruptures, while preventing gas leakage under normal conditions. The explosion-proof valve 13 is a thin sheet structure, typically made of a metal material such as aluminum, and is installed inside the explosion-proof hole 111. When the internal pressure of the battery exceeds a certain value, the explosion-proof valve 13 ruptures, releasing the internal pressure and preventing the battery from exploding. The explosion-proof valve 13 can precisely control its rupture pressure to ensure reliable rupture and pressure relief when the pressure reaches a critical value.

[0053] In some embodiments, such as Figure 5 As shown, the difference between the height of the convex portion 12 protruding outward and the height of the pole post 2 exposed on the top cover body 11 is h, where 0.8mm≤h≤5mm.

[0054] Specifically, the height difference h between the protrusion height of the convex portion 12 in the +Z direction and the exposed height of the pole post 2 on the upper surface of the top cover body 11 is strictly limited to between 0.8 mm and 5 mm. This numerical range was obtained after verification between two dimensions: welding reliability and high utilization rate.

[0055] The upper surface of the pole post 2 usually needs to be welded with a strip. After welding, the thickness of the weld and the strip overlaps. If h < 0.8 mm, the total height after welding is likely to exceed the height of the convex portion 12, causing the convex portion 12 to lose its "highest point" status. External impacts are then directly borne by the pole post 2 or the weld, and the risk of shear and compression on the sealing ring and plastic insulation 3 increases sharply. A margin of 0.8 mm can keep the highest point below the top surface of the convex portion 12 after welding, ensuring that the convex portion 12 always bears the force first and distributes the load.

[0056] When h > 5 mm, although there is sufficient mechanical protection margin, the space in the Z direction of the entire pack is unnecessarily occupied; when h ≤ 5 mm, the battery can be arranged to the maximum extent without sacrificing safety redundancy, while taking into account energy density.

[0057] Therefore, locking h within the range of 0.8 mm–5 mm strikes a balance between not exceeding the bulge after welding and not excessively wasting height, ensuring the mechanical safety of the battery cover assembly while maximizing the cell capacity.

[0058] In some embodiments, the thickness of the battery top cover 1 in the height direction of the top cover body 11 is t, where 0.8 mm ≤ t ≤ 3 mm. That is, the thickness t of the top cover body 11 and the protrusion 12 is 0.8 mm to 3 mm.

[0059] In this embodiment, the battery top cover 1 (including the top cover body 11 and the protruding part 12) is formed by continuous stamping from a single piece of metal sheet, and its thickness t is uniformly controlled within 0.8 mm ≤ t ≤ 3 mm. This thickness range is applicable to both steel materials (such as 304, 340LA, 440MPa grade high-strength steel) and aluminum materials (such as 3003-H14, 5052-H32, 6061-T6).

[0060] The minimum thickness of the battery top cover 1 is 0.8 mm. When laser welding / ultrasonic welding the casing, the required penetration depth is approximately 0.3–0.5 mm. If t < 0.8 mm, weld penetration and porosity are likely to occur, reducing sealing reliability. The maximum thickness of the battery top cover 1 is 3 mm. If it exceeds 3 mm, welding requires secondary beveling or multiple weld passes, resulting in high heat input, coarsening of grains in the heat-affected zone, decreased fatigue life, and redundant weight. Moreover, when 0.8 mm ≤ t ≤ 3 mm, it can be formed in one deep drawing using a mechanical or servo press, which can effectively improve processing efficiency.

[0061] In summary, the thickness range of 0.8mm–3mm covers the optimal balance between strength, welding, stamping, weight, and cost for both steel and aluminum, the two mainstream materials. A thickness below 0.8mm results in insufficient strength and high welding risk, while a thickness above 3mm leads to design redundancy, stamping difficulties, and is detrimental to system energy density.

[0062] In some embodiments, such as Figures 1 to 7 As shown, in the width direction of the top cover body 11, the distance from the edge of the convex portion 12 to the edge of the top cover body 11 is L, 1.5×t (mm)≤L≤20mm.

[0063] In this embodiment, the shortest straight-line distance L from the outermost edge of the convex portion 12 to the edge of the same side of the top cover body 11 is no longer a fixed interval, but is directly linked to the thickness t of the top cover, and is defined as: L_min = 1.5 × t and L ≤ 20 mm.

[0064] If L < 1.5t, corner collapse, burrs, and edge warping are very likely to occur. During subsequent deep drawing of the bulge, the edge material cannot flow in sufficiently, leading to cracks or wrinkles. The bulge 12 is the highest load-bearing point. When subjected to impact or stacking loads, the force is transmitted through the top of the bulge, the sidewalls of the bulge, and the edge of the top cover body 11. When L > 20 mm, the lever arm is too long, and the edge area becomes a "cantilever" state. The local bending stress increases linearly with L, which easily leads to plastic indentation or tearing at the edge.

[0065] In some embodiments, such as Figures 1 to 6 As shown, the width of the top cover body 11 is C (mm), the length of the top cover body 11 is D (mm), and the distance from the edge of the convex part 12 to the edge of the top cover body 11 is L.

[0066] In the width direction of the top cover body 11, the width of the protrusion 12 is b, where 5mm ≤ b ≤ C - 2 × (L + 5mm). If b < 5 mm, the contact area between the protrusion 12 and the top cover body 11 is too small, resulting in excessive local compressive stress and easy crushing during impact; while when b > C - 2 × (L + 5mm), the protrusion 12 is always located in the center of the effective load-bearing area of ​​the top cover, so that the impact force is evenly diffused to the entire cover surface.

[0067] Along the length of the top cover body 11, the total length of the two protrusions 12 is a (a=a1+a2), 5mm≤a≤(D-65)mm. Generally, the length of a single protrusion needs to be greater than 5mm. If the total length a of the two protrusions 12 is less than 10mm, the total contact area of ​​the protrusions 12 is insufficient. If the external force is too large, the top cover is prone to obvious plastic indentation under impact or compression conditions. If the total length a of the two protrusions 12 is greater than D-65mm, it cannot be ensured that the two protrusions 12 will not interfere with the pole post 2, the explosion-proof valve 13, and the necessary welding / positioning features.

[0068] For example, if C = 148 mm, t = 1 mm, L_min = 1.5 mm, and L = 5 mm: b_max = 148 - 2 × (5 + 5) = 128 mm, then b can be selected as needed between 5 mm and 128 mm. If D = 260 mm: a_max = 260 - 65 = 195 mm, then the total length a of the two convex parts 12 can be adjusted between 10 and 195 mm, and the length of a single convex part is approximately 5 mm to 97.5 mm.

[0069] In some embodiments, such as Figures 1 to 4 As shown, the top cover body 11 and / or the protrusion 12 are provided with liquid injection holes (not shown).

[0070] Specifically, the injection hole can be provided only on the top cover body 11, only on the protrusion 12, or in pairs on both the top cover body 11 and the protrusion 12.

[0071] If an injection hole is provided in the top cover body 11, the injection hole is a through hole that penetrates the top cover body 11. The hole axis can be perpendicular to the plane of the top cover body 11, or it can be set as an oblique hole according to the docking angle of the injection equipment. A countersunk platform or chamfer can be provided around the hole so that a sealing nail or a welding sealing plate can be pressed in after the injection is completed to achieve a reliable seal.

[0072] When the space below the top cover body 11 is filled with components such as tabs and adapters, or when a larger electrolyte flow rate is required, the electrolyte injection hole can be directly opened on the top or side wall of the convex portion 12. The convex portion 12 has additional height in the Z direction, which can form a flow channel inside, allowing the electrolyte to flow smoothly into the cell along the inner groove of the convex portion 12, avoiding direct impact of the liquid column on the electrode assembly. This solution can also utilize the rigidity of the convex portion 12 to form a thicker wall around the electrolyte injection hole, improving sealing reliability; at the same time, the electrolyte injection hole is located at the highest point of the convex portion 12, which helps to remove air bubbles after electrolyte injection and reduce residual air bubbles.

[0073] In scenarios requiring high flow rates, short injection times, or redundant sealing, a coaxial or staggered injection hole can be made on the top wall of the top cover body 11 and the top wall of the convex portion 12 directly above it. During injection, the electrolyte first enters the buffer chamber through the hole on the convex portion 12, and then flows into the battery cell through the hole on the top cover body 11, which can significantly reduce the risk of liquid splashing.

[0074] This application also provides a battery, such as... Figures 1 to 9 As shown, the battery includes: a battery casing, a battery electrode assembly, and a battery cover assembly. The battery cover assembly includes: a battery top cover 1, terminal posts 2, and an explosion-proof valve 13. The battery top cover 1 includes a top cover body 11 and two protruding portions 12 on the top cover body 11, and an explosion-proof hole 111 is formed on the top cover body 11; the terminal posts 2 are inserted into the top cover body 11, and the height of the protrusion of each protrusion 12 is greater than the height of the terminal post 2 exposed on the top cover body 11; the explosion-proof valve 13 is disposed in the explosion-proof hole 111; along the length of the top cover body 11, the terminal posts 2 and the explosion-proof valve 13 are located between the two protrusions 12. The battery electrode assembly is located inside the battery casing, and the battery cover assembly is fixed to the opening of the battery casing.

[0075] In this embodiment, the battery top cover 1 is formed by stamping a thin metal sheet, and the top cover body 11 is a rectangular top cover body 11. The thickness direction of the top cover body 11 is defined as the Z direction, the length direction as the X direction, and the width direction as the Y direction. The top cover body 11 has a through-hole explosion-proof hole 111 for the explosion-proof valve 13 to be embedded. Two protrusions 12 are stamped on the side of the top cover body 11 facing the outside of the battery (+Z direction). The protrusions 12 are elongated and extend along the X direction. Their longitudinal cross-section can be arc-shaped, trapezoidal, or multi-segmented zigzag to balance strength and performance. The terminal post 2 passes through the top cover body 11. Generally, the head of the terminal post 2 protrudes a certain height from the surface of the top cover body 11 in the +Z direction (or may not exceed the top cover body 11) to form a reliable electrical connection with the external busbar or power harness. On the +Z direction surface of the top cover body 11, two elongated protrusions 12 extending along the X direction are formed by stamping die. The Z-direction protrusion height of each convex portion 12 is precisely designed to be greater than the exposed height of the pole post 2, making the convex portion 12 the highest point of the entire cover assembly. The longitudinal cross-sectional profile of the convex portion 12 can be flexibly selected according to strength and space requirements. The elongated shape allows for a wider coverage area in the X-direction, which can quickly disperse lateral impact energy from any direction to the top cover body 11, preventing energy concentration in the pole post 2 area. From a spatial layout perspective, along the X-direction of the top cover body 11, the pole post 2 and the explosion-proof valve 13 are located between the two convex portions 12, forming a protective barrier for the pole post 2 and the explosion-proof valve 13.

[0076] Under normal operating conditions, this layout ensures that when the battery pack is stacked in the height direction, the two protrusions 12 make contact with the upper module first, preventing external forces from being directly transmitted to the terminal post 2, and significantly reducing the probability of microcracks or sealing failures caused by local pressure on the terminal post 2 and its sealing components.

[0077] Both the pole post 2 and the explosion-proof valve 13 are located within the "protected area" between the two protrusions 12. For foreign objects that may sweep past from the side or at an angle, the protrusions 12 act as a "barrier" to first contact the foreign object, causing plastic deformation and preventing it from continuing to slide, thus preventing sharp edges from scratching the pole post 2 or puncturing the explosion-proof valve 13.

[0078] The battery provided by this utility model features two outwardly protruding portions 12, with a height greater than the exposed height of the terminal post 2, making these two protruding portions 12 the highest points on the top of the cover plate. When the battery top cover 1 is subjected to external force, the force is first borne by the protruding portions 12. This avoids the force being directly and concentrated on the terminal post 2, thus significantly reducing the risk of failure of the terminal post 2 and its surrounding sealing structure due to pressure. Along the length of the top cover body 11, the terminal post 2 and the explosion-proof valve 13 are positioned between the two protruding portions 12. For impacts from foreign objects that may sweep from the side or at an angle, the protruding portions 12 can first contact and block the impact force, providing buffering and isolation. This reduces the probability of foreign objects directly impacting, scratching, or puncturing the top of the terminal post 2 or the explosion-proof valve 13 in the middle area. It avoids the serious safety accident risk of premature rupture or failure of the explosion-proof valve 13 due to accidental physical impact.

[0079] 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 cover assembly, characterized in that, include: A battery top cover includes a top cover body and two protruding portions on the top cover body, wherein an explosion-proof hole is formed on the top cover body. The pole is inserted into the top cover body, and the height of each of the protrusions is greater than the height of the pole exposed on the top cover body. An explosion-proof valve is installed in the explosion-proof hole; In the longitudinal direction of the top cover body, the pole and the explosion-proof valve are located between the two protruding portions.

2. The battery cover assembly according to claim 1, characterized in that, Both the convex bulge and the pole post are provided in two parts; Along the length of the top cover body, the two pole posts are located between the two protrusions, and the explosion-proof valve is disposed between the two pole posts.

3. The battery cover assembly according to claim 2, characterized in that, The two terminals are the positive terminal and the negative terminal, respectively; Along the length of the top cover body, one of the convex portions, the positive electrode post, the explosion-proof valve, the negative electrode post, and the other convex portion are sequentially arranged.

4. The battery cover assembly according to claim 1, characterized in that, In the height direction of the top cover body, the convex portion protrudes outward from the top cover body by at least one layer; In the height direction of the top cover body, the sum of the outward protrusions of each layer of the convex portion is greater than the height of the pole exposed on the top cover body.

5. The battery cover assembly according to claim 4, characterized in that, The convex hull includes a first convex hull and a second convex hull; The first convex bud protrudes outward from the top cover body, and the second convex bud continues to protrude outward from the first convex bud; In the height direction of the top cover body, the sum of the outward protrusions of the first convex bud and the second convex bud is greater than the height of the pole exposed on the top cover body.

6. The battery cover assembly according to claim 1, characterized in that, A groove is formed on the inner side of the convex portion; The battery cover assembly also includes: An insulating element is disposed on the inner side of the top cover body and the protrusion. The insulating element has a recessed portion formed at the position corresponding to the groove. The recessed portion is embedded in the groove, and a receiving space is formed in the recessed portion. The receiving space is used to accommodate at least a portion of the battery tabs.

7. The battery cover assembly according to any one of claims 2-6, characterized in that, The difference between the height of the outward protrusion of the convex portion and the height of the pole exposed on the top cover body is h, where 0.8mm≤h≤5mm; In the height direction of the top cover body, the thickness of the top cover body and the convex part is t, 0.8mm≤t≤3mm.

8. The battery cover assembly according to claim 7, characterized in that, In the width direction of the top cover body, the distance from the edge of the convex portion to the edge of the top cover body is L, 1.5×t (mm)≤L≤20mm.

9. The battery cover assembly according to claim 8, characterized in that, The width of the top cover body is C (mm), and the length of the top cover body is D (mm). In the width direction of the top cover body, the width of the convex portion is b, 5mm≤b≤C-2×(L+5mm). In the length direction of the top cover body, the total length of the two convex portions is a, 5mm≤a≤(D-65)mm.

10. A battery, characterized in that, include: The battery housing, the battery electrode assembly, and the battery cover assembly as described in any one of claims 1-9, wherein the battery electrode assembly is located inside the battery housing, and the battery cover assembly is fixed to the opening of the battery housing.

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