Battery cover plate and battery

Abstract

This application relates to the field of battery technology, and more particularly to a battery cover and a battery. The battery cover includes a plate body, an explosion-proof valve, a terminal post, a first insulating member, and an insulating support member. The explosion-proof valve and the terminal post are disposed on the plate body. The first insulating member is attached to the side of the plate body facing the electrode assembly. The electrode tabs of the electrode assembly are electrically connected to the terminal post. The insulating support member is disposed on the side of the first insulating member facing the electrode assembly and is positioned between the electrode tabs and the electrode assembly. The first insulating member has a first vent hole, and the insulating support member has a second vent hole. In a first direction, both the first and second vent holes are directly opposite the explosion-proof valve. The effective venting area of ​​the second vent hole is greater than or equal to the effective venting area of ​​the first vent hole. The battery cover and battery provided by this application eliminate the risk of short circuits caused by the gravity of the electrode assembly and avoid throttling resistance when gas flows through two stages of venting ports, ensuring smooth gas flow.

Description

Technical Field

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

[0002] In the field of new energy battery technology, the structural safety of battery modules or battery packs is crucial. Currently, to avoid the high-temperature flames from venting from the explosion-proof valve directly threatening the passenger compartment, the industry is gradually adopting a bottom-venting solution. This involves placing the battery cover below the battery in the direction of gravity, causing the explosion-proof valve to vent towards the bottom of the battery. However, this solution has two major problems: First, the tabs of the electrode assembly need to be electrically connected to the terminals on the battery cover. With the tabs located below the electrode assembly in the direction of gravity, the electrode assembly is prone to sinking due to its own weight over a long period, causing the tabs to directly insert into the electrode assembly, leading to a short circuit risk. Second, to achieve insulation protection, the side of the battery cover facing the electrode assembly usually needs to be equipped with an insulating component. If the insulating component is not properly arranged, it can easily block the venting path of the explosion-proof valve, preventing the high-temperature and high-pressure gases from escaping smoothly during thermal runaway, further exacerbating safety hazards. Utility Model Content

[0003] The purpose of this application is to provide a battery cover and battery to address, to some extent, the technical problems in the prior art where the tabs of the electrode assembly need to be electrically connected to the terminals on the battery cover, the tabs are located below the direction of gravity of the electrode assembly, and the electrode assembly is prone to sinking downwards due to the long-term effect of its own gravity, causing the tabs to be directly inserted into the electrode assembly, leading to a short circuit risk; in order to achieve insulation protection, the side of the battery cover facing the electrode assembly usually needs to be equipped with an insulating component, but if the insulating component is not arranged properly, it can easily block the exhaust path of the explosion-proof valve, causing high-temperature and high-pressure gases to be unable to be discharged smoothly during thermal runaway, further aggravating the safety hazards.

[0004] According to a first aspect of this application, a battery cover is provided for a battery, the battery including an electrode assembly, the battery cover being disposed on one side of the battery in a first direction; The battery cover includes a plate body, an explosion-proof valve, a terminal post, a first insulating component, and an insulating support component. The explosion-proof valve and the terminal post are disposed on the plate body. The first insulating component is attached to the side of the plate body facing the electrode assembly. The electrode tab of the electrode assembly is electrically connected to the terminal post. The insulating support component is disposed on the side of the first insulating component facing the electrode assembly, and the insulating support component is positioned between the electrode tab and the electrode assembly. The first insulating member is provided with a first vent hole, and the insulating support member is provided with a second vent hole. In the first direction, both the first vent hole and the second vent hole are directly opposite the explosion-proof valve, wherein the effective venting area of ​​the second vent hole is greater than or equal to the effective venting area of ​​the first vent hole.

[0005] Preferably, the first vent is a first annular slit conforming to the shape of the explosion-proof valve, and the second vent is a second annular slit conforming to the shape of the explosion-proof valve; Wherein, the annular seam width h1 of the second annular seam is greater than or equal to the annular seam width h2 of the second annular seam.

[0006] Preferably, the width h1 of the first annular seam is 0.05mm to 0.25mm; The width h2 of the second annular seam is 0.25mm to 1.2mm.

[0007] Preferably, the first insulating member includes an insulating body, a first baffle and a first connecting rib. The insulating body is provided with a first vent, the first baffle is disposed in the first vent, the first annular slit is formed between the first baffle and the insulating body, and the first connecting rib connects the first baffle and the insulating body.

[0008] Preferably, the insulating support includes a support body, a second baffle, and a second connecting rib. The support body is provided with a second vent, the second baffle is disposed in the second vent, the second annular slit is formed between the second baffle and the support body, and the second connecting rib connects the second baffle and the support body.

[0009] Preferably, in the circumferential direction of the first annular seam, the width w1 of the first connecting rib is 0.5mm to 2.0mm.

[0010] Preferably, in the circumferential direction of the second annular seam, the width w2 of the second connecting rib is 0.1mm to 0.35mm.

[0011] Preferably, the insulating support further includes an elastic support component, the support body is provided with a mounting opening extending through the support body in a first direction, the elastic support component includes a support plate portion and an elastic rib, the support plate portion is disposed in the mounting opening, the elastic rib connects the support plate portion and the support body, and the support plate portion is used to abut against the pole assembly; Relative to the supporting body, the elastic rib protrudes toward the side where the plate body is located; Relative to the supporting body, the side of the support plate that abuts against the pole assembly protrudes toward the side where the pole assembly is located.

[0012] Preferably, in the first direction, the distance d1 between the side of the support plate that abuts against the pole assembly and the support body is 0.5mm to 1.2mm; In the first direction, the minimum distance d2 from the elastic rib to the portion of the tab connected to the pole post is 0.5mm~1.2mm; In the direction perpendicular to the extension of the elastic rib, the width W of the elastic rib is 2.5mm to 18mm.

[0013] According to a second aspect of this application, a battery is provided, including the aforementioned electrode assembly and the battery cover as described in any of the aforementioned technical solutions, thus possessing all the beneficial technical effects of the battery cover, which will not be elaborated here.

[0014] Compared with the prior art, the beneficial effects of this application are as follows: The battery cover provided in this application, on the one hand, effectively isolates the battery body from the electrode assembly and the tabs by attaching the first insulating member to the side of the cover body facing the electrode assembly, preventing electrical short circuits; at the same time, the electrical connection structure between the tabs and the terminals is not blocked by the insulating support or the first insulating member, ensuring normal current conduction, improving safety while ensuring the basic electrical performance of the battery; and by setting the insulating support member on the battery cover, which is positioned between the tabs and the electrode assembly, the direct contact path between the tabs and the electrode assembly is blocked by the physical barrier, preventing the tabs from inserting into the electrode assembly when the electrode assembly settles, eliminating the risk of short circuits caused by the gravity of the electrode assembly, and significantly improving the structural stability and safety of the battery; on the other hand, an explosion-proof valve is set on the cover body, the first insulating member is provided with a first vent, and the insulating support member is provided with a second vent, and both are positioned directly opposite the explosion-proof valve in the first direction, forming a complete venting path of "battery interior → second vent → first vent → explosion-proof valve". To ensure that the high-temperature and high-pressure gas generated during battery thermal runaway can sequentially pass through the second exhaust port of the insulating support and the first exhaust port of the first insulating component before entering the explosion-proof valve and finally being discharged from the battery; at the same time, the effective exhaust area of ​​the second exhaust port is greater than or equal to the effective exhaust area of ​​the first exhaust port, which can avoid the throttling resistance caused by the area contraction when the gas flows through the two-stage exhaust ports, ensure smooth gas flow, give full play to the pressure relief function of the explosion-proof valve, and avoid secondary disasters such as explosion caused by excessive internal pressure of the battery.

[0015] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is an isometric structural diagram of the battery cover provided in an embodiment of this application; Figure 2 for Figure 1 An enlarged structural diagram of the provided battery cover at point A; Figure 3 for Figure 1 An enlarged structural diagram of the provided battery cover at point B; Figure 4 This is another isometric structural schematic diagram of the battery cover provided in the embodiments of this application; Figure 5 A cross-sectional structural diagram of a battery provided in an embodiment of this application; Figure 6 for Figure 5 An enlarged structural diagram of the provided battery cover at point C; Figure 7 This is an isometric structural diagram of the battery in its unfolded state, as provided in an embodiment of this application.

[0018] Figure label: 11-Insulating support; 110-Second annular seam; 111-Support body; 112-Second baffle; 113-Second connecting rib; 114-Elastic support component; 1141-Support plate; 1142-Elastic rib; 115-Support rib; 12-First insulating component; 120-First annular seam; 121-Insulating body; 1211-Insulating bonding part; 1212-Allowing part; 122-First baffle; 123-First connecting rib; 13-Second insulating component; 14-Third insulating component; 20-Plate body; 21-Pole post; 22-Explosion-proof valve; 30-Pole assembly body; 31-Pole lug.

[0019] F1 - First direction; F2 - Second direction; F3 - Third direction. Detailed Implementation

[0020] The technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this application, but not all embodiments.

[0021] The components of the embodiments of this application described and shown in the accompanying drawings can be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of this application provided in the drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application.

[0022] Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0023] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application 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 this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" 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; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0025] The following reference Figures 1 to 7 This application describes a battery cover and a battery according to some embodiments.

[0026] See Figures 1 to 7As shown, an embodiment of the first aspect of this application provides a battery cover for a battery. The battery includes an electrode assembly. The battery cover is disposed on one side of the battery in a first direction F1. The battery cover includes a plate body 20, an explosion-proof valve 22, a terminal post 21, a first insulating member 12, and an insulating support member 11. The explosion-proof valve 22 and the terminal post 21 are disposed on the plate body 20. The first insulating member 12 is attached to the side of the plate body 20 facing the electrode assembly. The electrode tab 31 of the electrode assembly is electrically connected to the terminal post 21. The insulating support member 11 is disposed on the side of the first insulating member 12 facing the electrode assembly and is positioned between the electrode tab 31 and the electrode assembly. The first insulating member 12 is provided with a first vent hole, and the insulating support member 11 is provided with a second vent hole. In the first direction F1, both the first vent hole and the second vent hole are directly opposite the explosion-proof valve 22. The effective venting area of ​​the second vent hole is greater than or equal to the effective venting area of ​​the first vent hole.

[0027] According to the battery cover provided by the above technical features, on the one hand, by attaching the first insulating member 12 to the side of the plate body 20 facing the electrode assembly, the plate body 20 can be effectively isolated from the electrode assembly and the tabs 31, preventing electrical short circuits; at the same time, the electrical connection structure between the tabs 31 and the terminals 21 is not blocked by the insulating support member 11 or the first insulating member 12, ensuring normal current conduction, improving safety while ensuring the basic electrical performance of the battery; and by setting the insulating support member 11 on the battery cover, and the insulating support member 11 blocking between the tabs 31 and the electrode assembly, through physical The barrier function blocks the direct contact path between the tab 31 and the electrode assembly, preventing the tab 31 from inserting into the electrode assembly when it settles, thus eliminating the risk of short circuits caused by the gravity of the electrode assembly and significantly improving the structural stability and safety of the battery. On the other hand, the explosion-proof valve 22 is located on the plate body 20. The first insulating member 12 has a first vent, and the insulating support member 11 has a second vent. Both are directly opposite the explosion-proof valve 22 in the first direction F1, forming a complete venting path of "battery interior → second vent → first vent → explosion-proof valve 22". This ensures that the high-temperature, high-pressure gas generated during battery thermal runaway can sequentially pass through the second vent of the insulating support member 11 and the first vent of the first insulating member 12 before entering the explosion-proof valve 22 and finally being discharged from the battery. Simultaneously, the effective venting area of ​​the second vent is greater than or equal to the effective venting area of ​​the first vent, preventing throttling resistance caused by area contraction when the gas flows through the two venting stages, ensuring smooth gas flow, fully utilizing the pressure relief function of the explosion-proof valve 22, and preventing secondary disasters such as explosions caused by excessive internal battery pressure.

[0028] like Figure 5 and Figure 6As shown in the figure, F1 can be an example of the first direction F1 mentioned above. For ease of description, the two directions that intersect each other on the plane where the first direction F1 intersects are defined as the second direction F2 and the third direction F3, respectively. Figures 1 to 7 As shown in the figure, F2 can be an example of the second direction F2 mentioned above, and F3 can be an example of the third direction F3 mentioned above. Preferably, the first direction F1 can be perpendicular to the plane determined by both the second direction F2 and the third direction F3, so as to accommodate most battery structures (e.g., square batteries, cylindrical batteries, regular polygonal cylindrical batteries, etc.). Figures 1 to 7 An example is shown where the second direction F2 and the third direction F3 are perpendicular to each other to accommodate the structure of a prismatic battery. Here, the first direction F1 can be the length direction of the prismatic battery, the second direction F2 can be the width direction of the prismatic battery, and the third direction F3 can be the thickness direction of the prismatic battery. When the battery is in use, the first direction F1 can be parallel to the direction of gravity, and the battery cover can be located below the direction of gravity of the battery to accommodate the structural arrangement of a bottom-venting scheme.

[0029] It should be noted that the first direction F1 mentioned above refers to the relative positional direction of the components when the battery is in use, while Figures 1 to 4 and Figure 7 The images shown all depict the battery or battery cover in an unfolded state (i.e., the battery cover is not attached to the battery). Figures 1 to 4 and Figure 7 The first direction F1 was not marked.

[0030] Preferably, such as Figures 1 to 4 As shown, the first vent can be a first annular slit 120 conforming to the shape of the explosion-proof valve 22. Similarly, the second vent can be a second annular slit 110 conforming to the shape of the explosion-proof valve 22. In this way, on the one hand, the first annular slit 120 / second annular slit 110 conforms to the shape of the explosion-proof valve 22, so that the vent profile completely corresponds to the vent area of ​​the explosion-proof valve 22, avoiding local vent concentration or blind spots, ensuring that thermal runaway gas enters the vent channel uniformly from the periphery of the electrode assembly, and reducing energy loss caused by gas turbulence; on the other hand, compared with non-annular vents, the annular slit structure can form a continuous circumferential vent path in the same projected area, matching the annular or circumferential vent characteristics of the explosion-proof valve 22, further reducing vent resistance.

[0031] like Figures 1 to 4As shown in the figure, the explosion-proof valve 22 is an example of a waist-shaped design, and correspondingly, the first annular slit 120 and the second annular slit 110 are both waist-shaped annular slits. However, this is not the only limitation. The first annular slit 120 and the second annular slit 110 can be adapted to the shape of the explosion-proof valve 22. For example, if the explosion-proof valve 22 is circular, the first annular slit 120 and the second annular slit 110 can both be circular annular slits; or if the explosion-proof valve 22 is square, the first annular slit 120 and the second annular slit 110 can both be square annular slits, and so on.

[0032] It should be noted that, as long as the ventilation of the explosion-proof valve 22 is ensured, the first and second vent holes are not limited to the structure of the annular slit. For example, the first and second vent holes can also be mesh holes or other forms of ventilation holes.

[0033] Preferably, such as Figure 2 and Figure 3 As shown, the annular gap width h1 of the second annular gap 110 can be greater than or equal to the annular gap width h2 of the second annular gap 110. In this way, continuing the design logic of "the front channel is not less than the rear channel", the gas flow through the two annular gaps is ensured without contraction and throttling from the dimension of annular gap width. Combined with the annular uniform exhaust characteristics, the overall exhaust efficiency is improved by more than 30% compared with the non-annular structure (based on fluid simulation data).

[0034] Preferably, such as Figure 3 As shown, the width h1 of the first annular slit 120 can be 0.05mm to 0.25mm. In this way, the gas flow requirements are met (avoiding excessive narrowness that would lead to a sharp increase in resistance), and the narrow slit structure can prevent tiny debris from falling off the electrode assembly from entering the explosion-proof valve 22, thus playing a filtering role of "gas passing through debris" and protecting the sealing performance of the explosion-proof valve 22.

[0035] Preferably, such as Figure 2 As shown, the width h2 of the second annular slit 110 can be 0.25mm to 1.2mm, and not less than h1. In this way, on the one hand, sufficient flow cross section is provided for the gas around the electrode assembly (the initial flow velocity of the gas near the electrode assembly is low, and a larger channel is needed to reduce the inlet resistance); on the other hand, this range matches the material thickness (usually 0.3mm to 2mm) of the first insulating member 12 and the insulating support member 11, so as to avoid the structural strength of the insulating member decreasing due to the excessive slit width.

[0036] In an embodiment, such as Figure 1 and Figure 3As shown, the first insulating component 12 includes an insulating body 121, a first baffle 122, and a first connecting rib 123. The insulating body 121 is provided with a first vent, the first baffle 122 is disposed in the first vent, and a first annular slit 120 is formed between the first baffle 122 and the insulating body 121. The first connecting rib 123 connects the first baffle 122 and the insulating body 121. In this way, the first baffle 122 fills the central area of ​​the vent, preventing the first annular slit 120 from being directly squeezed by the edge of the first annular slit 120 when the electrode assembly settles, thus preventing the first annular slit 120 from deforming and ensuring that the width of the first annular slit 120 remains at the design value for a long time. At the same time, the connecting rib is evenly distributed along the circumference and will not significantly block the effective venting area of ​​the annular slit.

[0037] Preferably, such as Figure 1 As shown, the insulating body 121 may include an insulating bonding portion 1211 and a clearance portion 1212. The insulating bonding portion 1211 is bonded to the plate body 20. The clearance portion 1212 may protrude relative to the insulating bonding portion 1211 toward the side where the pole assembly is located, so as to form a clearance groove similar in shape to the explosion-proof valve 22 on the side of the clearance portion 1212 facing the plate body 20, so as to accommodate the structure of the explosion-proof valve 22. The first annular slit 120 may be provided in the clearance portion 1212.

[0038] Preferably, such as Figure 3 As shown, in the circumferential direction of the first annular seam 120, the width w1 of the first connecting rib 123 is 0.5mm to 2.0mm. Thus, on the one hand, when w1 < 0.5mm, the first connecting rib 123 is prone to breakage due to thermal expansion and contraction of the insulating body 121 (especially under operating conditions of -40℃ to 85℃); when w1 > 2.0mm, the shielding angle of a single connecting rib on the annular seam exceeds 15°, leading to a sharp increase in local exhaust resistance. The width of 0.5mm to 2.0mm allows the connecting rib to withstand the tension between the insulating body 121 and the baffle while controlling the total shielding area within 3% to 5%. On the other hand, this width range matches the commonly used injection molding process for insulating parts (typically a minimum molding width of 0.3mm), avoiding material shortages due to excessive narrowness and ensuring the structural integrity of the first connecting rib 123.

[0039] Similarly, such as Figure 1 , Figure 2 and Figure 4As shown, the insulating support 11 may include a support body 111, a second baffle 112, and a second connecting rib 113. The support body 111 is provided with a second vent, the second baffle 112 is disposed in the second vent, a second annular slit 110 is formed between the second baffle 112 and the support body 111, and the second connecting rib 113 connects the second baffle 112 and the support body 111. Thus, the insulating support 11 directly faces the electrode assembly and is subject to greater impact force from the settlement of the electrode assembly. The second baffle 112 is connected to the support body 111 via the second connecting rib 113, forming a more rigid central support structure that can directly withstand the local pressure of the electrode assembly and prevent the support body 111 from deforming due to uneven stress. The second annular seam 110 is located between the second baffle 112 and the support body 111. The baffle can prevent large pieces of electrode material (such as electrode fragments) that fall off the electrode assembly from entering the exhaust channel. The number and distribution of the second connecting rib 113 are optimized to ensure that the shielding area of ​​the annular seam is <8% and does not affect the exhaust efficiency.

[0040] Preferably, such as Figure 1 and Figure 2 As shown, the aforementioned insulating support 11 may further include a supporting rib 115. The supporting rib 115 may be disposed on the side of the supporting body 111 opposite to the electrode assembly, so as to support both the supporting body 111 and the insulating body 121 through the supporting rib 115, thereby forming a certain gas-bearing space between the insulating support 11 and the first insulating member 12, so as to store the gas that enters between the insulating support 11 and the first insulating member 12 through the second annular gap 110 and is not discharged in time by the first annular gap 120, thereby providing a buffer space for gas discharge and further improving the venting safety of the battery cover.

[0041] Preferably, such as Figure 2 As shown, in the circumferential direction of the second annular seam 110, the width w2 of the second connecting rib 113 is 0.1mm~0.35mm. Thus, on the one hand, the insulating support 11 is close to the pole assembly, and the space is compact. The narrow rib design with w2=0.1mm~0.35mm can reduce the space occupied around the pole assembly and avoid interference with the pole lug 31 or the edge of the pole assembly; on the other hand, the narrower second connecting rib 113 has a certain elastic deformation capability. When the pole assembly settles slightly, the second connecting rib 113 can move slightly with the second baffle 112 to avoid rigid fracture, while not affecting the width stability of the annular seam.

[0042] In an embodiment, such as Figure 1 , Figures 4 to 6As shown, the insulating support 11 may further include an elastic support member 114. The support body 111 is provided with a mounting opening extending through the support body 111 in the first direction F1. The elastic support member 114 includes a support plate portion 1141 and an elastic rib 1142. The support plate portion 1141 is disposed in the mounting opening, and the elastic rib 1142 connects the support plate portion 1141 and the support body 111. The support plate portion 1141 is used to abut against the electrode assembly. Relative to the support body 111, the side of the support plate portion 1141 that abuts against the electrode assembly protrudes towards the side where the electrode assembly is located. Relative to the support body 111, the elastic rib 1142... The elastic rib 1142 protrudes towards the side of the plate body 20, thus physically supporting and preventing the pole assembly from sinking excessively, reducing the risk of the pole tab 31 being inserted internally. On the one hand, the elastic rib 1142 protrudes towards the side of the plate body 20, forming an "elastic fulcrum". When the pole assembly is subjected to vibration or impact, the elastic rib 1142 can absorb energy through deformation, avoiding rigid collision between the support plate 1141 and the pole assembly, which would cause damage to the pole assembly. On the other hand, the elastic deformation of the elastic rib 1142 can compensate for the thickness tolerance of different pole assemblies, ensuring that the support plate 1141 is always in reliable contact with the pole assembly, avoiding support failure due to gaps.

[0043] Preferably, such as Figure 1 , Figure 4 and Figure 5 The figure shows an example of the support plate 1141 extending as a rectangular plate along the second direction F2. The elastic rib 1142 can extend along the third direction F3. Both ends of the support plate 1141 in the second direction F2 can be connected to the support body 111 via the elastic rib 1142 to ensure the support stability of the support plate 1141 for the pole assembly.

[0044] However, it is not limited to this. The aforementioned support plate 1141 is not limited to the example of a rectangular plate extending along the second direction F2. As long as it can provide elastic support for the pole assembly, the support plate 1141 can also be a circular plate, an elliptical plate, a polygonal plate, or other irregularly shaped plates. Correspondingly, the aforementioned elastic rib 1142 can be adaptively adjusted according to the outer contour of the support plate 1141.

[0045] Preferably, such as Figure 1 , Figure 4 and Figure 5 As shown in the figure, an example of the above-mentioned insulating support member 11 being provided with two elastic support members 114 is illustrated. The two elastic support members 114 can be arranged at intervals along the second direction F2, but are not limited thereto. The number of the above-mentioned elastic support members 114 can be adaptively adjusted according to the size of the insulating support member 11 in the second direction F2.

[0046] Preferably, such as Figure 6As shown, in the first direction F1, the distance d1 between the side of the support plate portion 1141 that abuts against the pole assembly and the support body 111 can be 0.5mm to 1.2mm. This ensures that the support plate portion 1141 has sufficient protrusion to abut against the pole assembly, while reserving space for the deformation of the elastic rib 1142 (after deformation, the support plate portion 1141 will not be excessively compressed to be flush with the support body 111).

[0047] Preferably, such as Figure 6 As shown, in the first direction F1, the minimum distance d2 between the elastic rib 1142 and the part of the tab 31 connected to the pole post 21 is 0.5mm~1.2mm. In this way, the elastic rib 1142 is prevented from contacting the tab 31. Even if the pole assembly settles or the elastic rib 1142 deforms, the insulation gap can still be maintained to prevent short circuit.

[0048] Preferably, such as Figure 6 As shown, in the direction perpendicular to the extension of the elastic rib 1142, the width W of the elastic rib 1142 is 2.5mm~18mm. Thus, when W < 2.5mm, the elastic rib 1142 is prone to breakage due to excessive force; when W > 18mm, the elasticity is too weak to effectively buffer the load. The 2.5mm~18mm width allows the elastic rib 1142 to provide effective support and generate effective deformation.

[0049] Preferably, such as Figures 1 to 4 As shown, the first insulating component 12 and the insulating support component 11 can both be integral injection molded parts.

[0050] Preferably, such as Figure 6 As shown, the battery cover may further include a second insulating member 13 and a third insulating member. The second insulating member 13 may be sleeved on the outside of the terminal post 21 and may be embedded in the plate body 20. The third insulating member 14 may be disposed on the side of the plate body 20 opposite to the electrode assembly and may also be sleeved on the outside of the terminal post 21. At least a portion of the third insulating member 14 may extend between the terminal post 21 and the side of the plate body 20 opposite to the electrode assembly. The two ends of the second insulating member 13 in the first direction F1 may respectively abut against the first insulating member 12 and the third insulating member 14 to achieve complete insulation between the terminal post 21 and the plate body 20.

[0051] Preferably, such as Figure 4 and Figure 5 As shown, the battery cover can include two terminals 21, which can be spaced apart along the second direction F2, and the explosion-proof valve 22 can be disposed between the two terminals 21.

[0052] The second aspect of this application also provides a battery, including the above-described electrode assembly and the battery cover as described in any of the above embodiments, thus possessing all the beneficial technical effects of the battery cover, which will not be repeated here.

[0053] Preferably, such as Figure 6 As shown in the figure, the above-mentioned electrode assembly includes an example of two electrode bodies 30. The tabs 31 of the two electrode bodies 30 can extend from the battery cover on both sides in the third direction F3 and between the first insulating member 12 and the insulating support member 11, so that the two electrode bodies 30 are connected to the pole post 21 respectively. This effectively shortens the connection path and length of the tabs 31, and further reduces the risk of the tabs 31 being pressed into the electrode body 30.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application 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 or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A battery cover plate, characterized by, For use in a battery, the battery including an electrode assembly, the battery cover being disposed on one side of the battery in a first direction; The battery cover includes a plate body, an explosion-proof valve, a terminal post, a first insulating component, and an insulating support component. The explosion-proof valve and the terminal post are disposed on the plate body. The first insulating component is attached to the side of the plate body facing the electrode assembly. The electrode tab of the electrode assembly is electrically connected to the terminal post. The insulating support component is disposed on the side of the first insulating component facing the electrode assembly, and the insulating support component is positioned between the electrode tab and the electrode assembly. The first insulating member is provided with a first vent hole, and the insulating support member is provided with a second vent hole. In the first direction, both the first vent hole and the second vent hole are directly opposite the explosion-proof valve, wherein the effective venting area of ​​the second vent hole is greater than or equal to the effective venting area of ​​the first vent hole.

2. The battery cover plate of claim 1, wherein, The first vent hole is a first annular slit that conforms to the shape of the explosion-proof valve, and the second vent hole is a second annular slit that conforms to the shape of the explosion-proof valve; Wherein, the annular seam width h1 of the second annular seam is greater than or equal to the annular seam width h2 of the second annular seam.

3. The battery cover according to claim 2, characterized in that, The width h1 of the first annular seam is 0.05mm to 0.25mm; The width h2 of the second annular seam is 0.25mm to 1.2mm.

4. The battery cover plate of claim 2, wherein, The first insulating element includes an insulating body, a first baffle, and a first connecting rib. The insulating body is provided with a first vent, the first baffle is disposed in the first vent, the first annular slit is formed between the first baffle and the insulating body, and the first connecting rib connects the first baffle and the insulating body.

5. The battery cover plate of claim 2, wherein, The insulating support includes a support body, a second baffle, and a second connecting rib. The support body is provided with a second vent, the second baffle is disposed in the second vent, the second annular slit is formed between the second baffle and the support body, and the second connecting rib connects the second baffle and the support body.

6. The battery cover plate of claim 4, wherein, In the circumferential direction of the first annular seam, the width w1 of the first connecting rib is 0.5mm to 2.0mm.

7. The battery cover plate of claim 5, wherein, In the circumferential direction of the second annular seam, the width w2 of the second connecting rib is 0.1mm~0.35mm.

8. The battery cover plate of claim 5, wherein, The insulating support also includes an elastic support component. The support body is provided with a mounting opening that extends through the support body in a first direction. The elastic support component includes a support plate and an elastic rib. The support plate is disposed in the mounting opening. The elastic rib connects the support plate and the support body. The support plate is used to abut against the pole assembly. Relative to the supporting body, the elastic rib protrudes toward the side where the plate body is located; Relative to the supporting body, the side of the support plate that abuts against the pole assembly protrudes toward the side where the pole assembly is located.

9. The battery cover according to claim 8, characterized in that, In the first direction, the distance d1 between the side of the support plate that abuts against the pole assembly and the support body is 0.5mm to 1.2mm; In the first direction, the minimum distance d2 from the elastic rib to the portion of the tab connected to the pole post is 0.5mm~1.2mm; In the direction perpendicular to the extension of the elastic rib, the width W of the elastic rib is 2.5mm to 18mm.

10. A battery, characterized by Includes the electrode assembly and the battery cover according to any one of claims 1 to 9.

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