Battery cover plate and battery

Abstract

The utility model relates to power battery technical field provides a battery cover plate and battery. The battery cover plate includes cover plate main part, pole and connecting piece, is equipped with the convex structure on the cover plate main part, the convex structure is integrally arranged with the cover plate main part, along the thickness direction of cover plate main part, the inside of cover plate main part corresponds the recessed groove formed with the convex structure, the connecting piece includes first connecting part and second connecting part, the axial inner end of pole is connected with first connecting part, and at least part of second connecting part is located in the recessed groove. The utility model solves the defect that the overall strength of the existing battery pack is low, which affects the stability and safety when it is subjected to external impact or pressure. And the connecting piece at least part of the occupied battery shell internal space can be eliminated, the space utilization of the battery is improved, the length of the pole lug is effectively reduced when applied to the battery, the risk of pole lug tearing is eliminated, and the first connecting part can be used as part of the pole, which can save pole material and reduce the internal resistance of the battery.

Description

Technical Field

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

[0002] A power battery is a rechargeable battery used to power devices such as electric vehicles, primarily by storing and releasing electrical energy to drive an electric motor.

[0003] In existing technologies, the highest point of a battery (cell) is typically located on the terminal post on the cover plate. To ensure sufficient safety performance, batteries are generally protected from excessive external forces within the battery pack to prevent damage to the internal structure. However, this design also results in lower overall strength of the battery pack, potentially affecting its stability and safety under external impacts or pressure. Furthermore, the connecting tabs, as electrical connectors linking the electrode assembly and the terminal post, occupy additional space within the battery casing, leading to lower space utilization. Utility Model Content

[0004] This utility model provides a battery cover and a battery to solve the defects of low battery space utilization and low overall strength of battery pack in the prior art.

[0005] This utility model provides a battery cover, comprising: a cover body, an electrode post, and a connecting piece.

[0006] The cover plate body is provided with a protruding structure, the protruding structure forming a contact surface that contacts the structural components of the battery pack. The protruding structure is integrally formed with the cover plate body, and along the thickness direction of the cover plate body, the cover plate body forms a receiving groove corresponding to the inner side of the protruding structure. The pole is disposed on the cover plate body. The connecting piece includes a first connecting part and a second connecting part, the first connecting part is connected to the second connecting part, the axial inner end of the pole is connected to the first connecting part, and at least a portion of the second connecting part is located in the receiving groove.

[0007] According to the battery cover provided by this utility model, the first connecting part is provided with a first electrode post hole, and the axial inner end of the electrode post is located in the first electrode post hole.

[0008] According to the battery cover provided by this utility model, the electrode post includes a main body, a first step, and a second step. The first step is disposed in the main body, and the second step is disposed in the first step. The second step is located inside the first electrode post hole. A third step is provided on the first connecting part, and the axial outer end face of the third step is in contact with the axial inner end face of the first step.

[0009] The battery cover provided by this utility model further includes: a sealing ring, the sealing ring being sleeved on the third step portion, the axial inner end face of the sealing ring abutting against the axial outer end face of the first connecting portion, and the inner end face of the cover body and the axial inner end face of the first step portion abutting against the axial outer end face of the sealing ring. The portion of the inner end face of the cover body that mates with the sealing ring is coplanar with the axial inner end face of the first step portion.

[0010] According to the battery cover provided by this utility model, the first electrode hole is a circular hole, and the diameter D of the first electrode hole is 1.5mm≤D≤12mm; and / or, the distance W between the outer edge of the third step portion and the outer edge of the first connecting portion is 5mm≤W≤8mm; and / or, the thickness T1 of the first connecting portion is 1.2mm≤T1≤3mm; and / or, the thickness T2 of the second connecting portion is 0.4mm≤T2≤1.2mm.

[0011] According to the battery cover provided by this utility model, the connecting piece further includes a transition connecting portion, the first end of the transition connecting portion is connected to the first connecting portion, and the second end of the transition connecting portion is connected to the second connecting portion.

[0012] According to the battery cover provided by this utility model, the first connecting part, the transition connecting part and the second connecting part are integrally formed.

[0013] According to the battery cover provided by this utility model, the cover body is provided with two protruding structures spaced apart along the length direction, and an explosion-proof valve hole is provided between the two protruding structures. The explosion-proof valve hole is used to install an explosion-proof valve. A second pole hole is provided on the outer side of each protruding structure along the length direction on the cover body. The second pole hole is used to install a pole.

[0014] According to the battery cover provided by this utility model, a first spacing G1 is provided between the two sides of the explosion-proof valve hole along the length direction and the corresponding side protrusion structure, and a second spacing G2 is provided between the second pole post hole and the corresponding side protrusion structure along the length direction.

[0015] In another aspect, this utility model provides a battery, comprising: a battery cover, a housing, and an electrode assembly, wherein the battery cover is disposed in the housing, and the electrode assembly is disposed within the housing.

[0016] The battery cover and battery provided by this utility model, by setting a protruding structure on the main body of the cover, can contact the structural components of the battery pack (such as liquid cooling plates) to provide support and fixation for the battery, improve the stability of the battery within the battery pack and enhance the overall structural strength of the battery pack. Furthermore, since the battery can bear weight, the clearance space between the battery and the structural components of the battery pack can be eliminated, and the overall height of the battery can be increased to improve its capacity. Simultaneously, since a receiving groove is formed on the inner side of the cover body corresponding to the protruding structure, and at least a portion of the second connecting part of the connecting piece is located within this receiving groove, the internal space of the battery casing occupied by at least a portion of the connecting piece can be eliminated, thereby improving the space utilization rate of the battery. When applied to a battery, it effectively reduces the length of the tabs, eliminates the risk of tab tearing, and the first connecting part can serve as part of the terminal post, saving terminal post material and reducing the internal resistance of the battery.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. 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 one of the schematic diagrams of the battery cover provided in this embodiment of the utility model.

[0020] Figure 2 This is the second schematic diagram of the battery cover provided in this embodiment of the utility model.

[0021] Figure 3 This is the third schematic diagram of the battery cover provided in this embodiment of the utility model.

[0022] Figure 4 yes Figure 3 A magnified view of part A in the diagram.

[0023] Figure 5 This is one of the schematic diagrams of the connecting piece in the battery cover provided in this embodiment of the utility model.

[0024] Figure 6 This is the second schematic diagram of the connecting piece in the battery cover provided in this embodiment of the utility model.

[0025] Figure 7 This is the fourth schematic diagram of the battery cover provided in this embodiment of the utility model.

[0026] Figure 8 This is one of the schematic diagrams of the battery provided in the embodiment of this utility model.

[0027] Figure 9 This is a second schematic diagram of the battery provided in this embodiment of the present invention.

[0028] Figure 10 This is the third schematic diagram of the battery provided in this embodiment of the utility model.

[0029] Figure label: 100. Battery cover; 110. Cover body; 111. Protruding structure; 1111. Contact surface; 1112. Receiving groove; 112. Explosion-proof valve hole; 113. Second pole hole; 120. Pole; 121. Main body; 122. First step; 123. Second step; 130. Connecting piece; 131. First connecting part; 1311. First pole hole; 1312. Third step; 132. Second connecting part; 133. Transition connecting part; 140. Sealing ring; 150. Explosion-proof valve; 200. Housing; 300. Pole group. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0031] 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.

[0032] 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 according to the specific circumstances.

[0033] 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.

[0034] 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.

[0035] The following is combined Figures 1 to 10 This invention describes the battery cover 100 and the battery provided by this utility model.

[0036] See Figures 1 to 4 As shown, the battery cover 100 provided in this embodiment of the present invention includes: a cover body 110, an electrode post 120, and a connecting piece 130.

[0037] The cover plate body 110 is provided with a protruding structure 111, which forms a contact surface 1111 that contacts the structural components of the battery pack. The protruding structure 111 is integrally formed with the cover plate body 110, and along the thickness direction of the cover plate body 110, a receiving groove 1112 is formed on the inner side of the cover plate body 110 corresponding to the protruding structure 111. The pole post 120 is provided on the cover plate body 110. The connecting piece 130 includes a first connecting part 131 and a second connecting part 132. The first connecting part 131 is connected to the second connecting part 132. The axial inner end of the pole post 120 is connected to the first connecting part 131. At least a portion of the second connecting part 132 is located in the receiving groove 1112.

[0038] The battery cover 100 and battery provided by this utility model, by providing a protruding structure 111 on the cover body 110, can contact the structural components of the battery pack (such as liquid cooling plates) to provide support and fixation for the battery, improve the stability of the battery in the battery pack and improve the overall structural strength of the battery pack. Furthermore, since the battery can bear the load, the clearance space between the battery and the structural components of the battery pack can be eliminated, and the overall height of the battery can be increased to improve the battery capacity. At the same time, since a receiving groove 1112 is formed on the inner side of the cover body 110 corresponding to the protruding structure 111, and at least a portion of the second connecting part 132 of the connecting piece 130 is located in the receiving groove 1112, the space inside the battery housing 200 occupied by at least a portion of the connecting piece 130 can be eliminated, thereby improving the space utilization of the battery. When applied to the battery, it can effectively reduce the length of the tabs, eliminate the risk of tab tearing, and the first connecting part 131 can be used as part of the terminal post 120, which can save the material of the terminal post 120 and reduce the internal resistance of the battery.

[0039] Specifically, the battery cover 100 provided by this utility model includes a cover body 110, which is the main component of the battery cover 100 and is typically made of metal materials such as aluminum plate. When applied to a battery, the cover body 110 is usually laser-welded to the port position of the housing 200. Simultaneously, the cover body 110 is also used to install and arrange components such as terminal posts 120; for this purpose, matching structures such as terminal posts 120 can be provided on the cover body 110. The cover body 110 is provided with a protruding structure 111, which is integrally formed with the cover body 110. During processing, the protruding structure 111 with a certain structural strength can be formed on the cover body 110 in a single stamping process, simplifying manufacturing.

[0040] It is understood that the number of protruding structures 111 on the cover body 110 is at least one, that is, it includes both single and multiple forms. The specific arrangement depends on the layout of components such as the pole post 120 and the explosion-proof valve 150 on the cover body 110, as well as the required area of ​​the supporting contact surface 1111. For example, when the plane space occupied by components such as the pole post 120 and the explosion-proof valve 150 on the cover body 110 is large, only a single protruding structure 111 can be set on the cover body 110 to meet the space layout requirements. Conversely, multiple protruding structures 111 can be set to distribute the force through multiple protruding structures 111, thereby optimizing the stress conditions when the battery cover 100 is applied to batteries and battery packs.

[0041] It should be noted that when the cover body 110 is provided with multiple protruding structures 111, the heights of the multiple protruding structures 111 (i.e., the distance between the contact surface 1111 and the cover body 110) can be the same or different, and no special limitation is made in this regard. For example, when the distances between the multiple protruding structures 111 and the structural components of the battery pack are the same, the heights of the multiple protruding structures 111 must be consistent to meet the condition that the contact surfaces 1111 of the multiple protruding structures 111 simultaneously contact the structural components of the battery pack. Correspondingly, in some specific embodiments, if the distances between different protruding structures 111 and the structural components of the battery pack are different, the heights of the multiple protruding structures 111 can also be set according to the distances between them and the structural components of the battery pack, and no special limitation is made in this regard.

[0042] Furthermore, when the cover plate body 110 is provided with multiple protruding structures 111, the outer contours of the different protruding structures 111 can be the same or different, and there is no special limitation on this. For example, the outer contours of some of the protruding structures 111 are square, and the outer contours of some of the protruding structures 111 are circular, etc.

[0043] As an example, in this embodiment, the cover plate body 110 is provided with two square-shaped protrusions 111. The two protrusions 111 have the same overall height and are spaced apart along the length direction. This allows both protrusions 111 to simultaneously contact the structural components of the battery pack, while also providing installation space for components such as the explosion-proof valve 150. It should be noted that in this embodiment, "length direction" specifically refers to... Figure 1 The direction of the arrow shown can be understood as the length direction of the battery cover 100.

[0044] The terminal 120 is located on the cover plate body 110 and is used to connect the positive and negative terminals of the battery to the external circuit. It is the output terminal of the internal electrochemical reaction of the battery and can conduct current so that the battery can work normally with external devices.

[0045] The connecting piece 130 includes a first connecting portion 131 and a second connecting portion 132. The first connecting portion 131 is connected to the second connecting portion 132, and the axial inner end of the terminal post 120 is connected to the first connecting portion 131. At least a portion of the second connecting portion 132 is located within the receiving groove 1112. The first connecting portion 131 and the second connecting portion 132 can be independent components, connected and fixed by welding, snap-fitting, or threaded connection to achieve electrical connection. Alternatively, the first connecting portion 131 and the second connecting portion 132 can be integrally formed by processing sheet metal material into the required structural form of the connecting piece 130 through processes such as stamping. The first connecting portion 131 is used to connect to the axial inner end of the terminal post 120 and can be part of the terminal post 120 to save terminal post 120 material and reduce the internal resistance of the battery. At least a portion of the second connecting portion 132 is located within the receiving groove 1112, which can eliminate the internal space of the battery housing 200 occupied by the connecting piece 130, thereby improving the space utilization of the battery. That is, based on adapting to the structural characteristics of the protruding structure 111, the spatial layout of the battery can be optimized and the space utilization can be improved.

[0046] It is understood that the connection between the first connecting part 131 and the axial inner end of the terminal post 120 is an electrical connection, so as to connect the tab of the electrode group 300 and the terminal post 120 through the connecting piece 130. During processing, welding is preferably used to connect the first connecting part 131 and the axial inner end of the terminal post 120. In addition to the connecting piece 130, by controlling the depth and length and width dimensions of the receiving groove 1112, it can also be used to accommodate other components / structures (such as the tab of the electrode group 300) in the battery casing 200, and there are no special limitations on this.

[0047] See Figure 4 and Figure 5 As shown, according to some embodiments of the present invention, the first connecting part 131 is provided with a first pole post hole 1311, and the axial inner end of the pole post 120 is located in the first pole post hole 1311.

[0048] By providing a first electrode hole 1311 in the first connecting part 131, the space occupied by the first connecting part 131 is eliminated, which can improve the space utilization of the battery. During assembly, the axial inner end of the electrode 120 can be fitted into the first electrode hole 1311 to pre-position the connecting piece 130, and then the first connecting part 131 and the axial inner end of the electrode 120 can be connected by welding or other methods, which facilitates welding processing.

[0049] See Figure 3 and Figure 5As shown, according to some embodiments of the present invention, the pole post 120 includes a main body 121, a first step 122 and a second step 123. The first step 122 is disposed on the main body 121, and the second step 123 is disposed on the first step 122. The second step 123 is located inside the first pole post hole 1311. A third step 1312 is provided on the first connecting part 131, and the axial outer end face of the third step 1312 contacts the axial inner end face of the first step 122.

[0050] By configuring the terminal post 120 into a structure including a main body 121, a first stepped portion 122, and a second stepped portion 123, and providing a first terminal post hole 1311 on the first connecting portion 131 of the connecting piece 130, the second stepped portion 123 can be installed into the first terminal post hole 1311 by welding or other methods during assembly, making the first connecting portion 131 part of the terminal post 120, thereby saving terminal post 120 material and reducing the battery's internal resistance. Simultaneously, the axial inner end face of the second stepped portion 123 contacts the axial outer end face of the third stepped portion 1312, which increases the current-carrying area and effectively reduces resistance when current flows, thereby reducing heat generation and losses.

[0051] Preferably, in this embodiment, the main body 121, the first step 122, and the second step 123 are coaxially arranged. When the connecting piece 130 is assembled on the cover body 110, the first pole hole 1311 and the second pole hole 113 are coaxially arranged to simplify the structure of the battery cover 100.

[0052] See Figure 3 and Figure 4 As shown, according to some embodiments of the present invention, the battery cover 100 further includes: a sealing ring 140, the sealing ring 140 being sleeved on the third step portion 1312, the axial inner end face of the sealing ring 140 abutting against the axial outer end face of the first connecting portion 131, and the inner end face of the cover body 110 and the axial inner end face of the first step portion 122 both abutting against the axial outer end face of the sealing ring 140. The portion of the inner end face of the cover body 110 that mates with the sealing ring 140 is coplanar with the axial inner end face of the first step portion 122.

[0053] By setting the portion of the axial inner end face of the first step portion 122 that mates with the sealing ring 140 to be coplanar with the inner end face of the cover plate body 110, the compression amount applied to the sealing ring 140 by the pole post 120 and the first connecting portion 131 can be kept consistent, thereby improving the stability of the sealing ring 140 during assembly.

[0054] See Figure 5 and Figure 6 As shown, according to some embodiments of the present invention, the first pole hole 1311 is a circular hole, and the diameter D of the first pole hole 1311 is 1.5mm≤D≤12mm.

[0055] By setting the first electrode post hole 1311 as a circular hole and setting the hole diameter D of the first electrode post hole 1311 to 1.5mm≤D≤12mm, it is possible to ensure that the electrode post 120 has sufficient flow area and improve the strength of the third step portion 1312. At the same time, when the second step portion 123 of the electrode post 120 is placed in the first electrode post hole 1311, it facilitates the welding operation.

[0056] As an example, the diameter D of the first pole post hole 1311 can be 1.5mm, 3mm, 5mm, 8mm, 10mm or 12mm, etc.

[0057] See Figure 5 and Figure 6 As shown, according to some embodiments of the present invention, the distance W between the outer edge of the third step portion 1312 and the outer edge of the first connecting portion 131 is 5mm≤W≤8mm.

[0058] By setting the distance W between the outer edge of the third step portion 1312 and the outer edge of the first connecting portion 131 to 5mm≤W≤8mm, sufficient installation space can be provided for the sealing ring 140, ensuring that the axial inner end face of the sealing ring 140 can completely abut against the axial outer end face of the first connecting portion 131, thereby ensuring sufficient sealing area.

[0059] It should be noted that the distance W between the outer edge of the third step portion 1312 and the outer edge of the first connecting portion 131 can be the same or different at different positions along the circumference. There is no special limitation on this, as long as W is 5mm ≤ W ≤ 8mm. For example, in this embodiment, the outer edge of the first connecting portion 131 is a square with rounded corners, while the third step portion 1312 is a circular step. At at least some different positions along the circumference, the distance W between the outer edge of the third step portion 1312 and the outer edge of the first connecting portion 131 is different.

[0060] As an example, the distance W between the outer edge of the third step portion 1312 and the outer edge of the first connecting portion 131 can be 5mm, 5.5mm, 6mm, 6.5mm, 7mm or 8mm, etc.

[0061] See Figure 5 and Figure 6 As shown, the thickness T1 of the first connecting part 131 is 1.2mm≤T1≤3mm, and the thickness T2 of the second connecting part 132 is 0.4mm≤T2≤1.2mm.

[0062] By setting the thickness T1 of the first connecting portion 131 to 1.2mm≤T1≤3mm, the first connecting portion 131 can have sufficient structural strength, while also ensuring the compression of the sealing ring 140 to guarantee the sealing effect. By setting the thickness T2 of the second connecting portion 132 to 0.4mm≤T2≤1.2mm, the structural strength of the second connecting portion 132 can be guaranteed, as well as the welding bending effect between the second connecting portion 132 and the electrode tab, thus ensuring battery performance. At the same time, it also avoids the second connecting portion 132 being too thick and occupying too much internal space of the receiving groove 1112, thereby improving the space utilization rate of the battery.

[0063] As an example, the thickness T1 of the first connecting part 131 can be 1.2mm, 1.5mm, 1.8mm, 2mm, 2.5mm or 3mm, etc., and the thickness T2 of the second connecting part 132 can be 0.4mm, 0.5mm, 0.6mm, 0.8mm, 1mm or 1.2mm, etc.

[0064] The experimental verification parameters are set as shown in Table 1 below.

[0065] Table 1: Experimental parameters for Examples 1 to 6 and Comparative Examples 1 to 4.

[0066] Serial Number D / mm W / mm T1 / mm T2 / mm Verification effect Example 1 1.5 5 1.2 0.4 The connecting piece structure is reasonably designed, the battery overcurrent meets the requirements, the sealing ring compression meets the requirements, the connecting piece strength is sufficient, and there is no deformation after welding the electrode tabs. Example 2 3 5.5 1.5 0.5 The connecting piece structure is reasonably designed, the battery overcurrent meets the requirements, the sealing ring compression meets the requirements, the connecting piece strength is sufficient, and there is no deformation after welding the electrode tabs. Example 3 5 6 1.8 0.6 The connecting piece structure is reasonably designed, the battery overcurrent meets the requirements, the sealing ring compression meets the requirements, the connecting piece strength is sufficient, and there is no deformation after welding the electrode tabs. Example 4 8 6.5 2 0.8 The connecting piece structure is reasonably designed, the battery overcurrent meets the requirements, the sealing ring compression meets the requirements, the connecting piece strength is sufficient, and there is no deformation after welding the electrode tabs. Example 5 10 7 2.5 1.0 The connecting piece structure is reasonably designed, the battery overcurrent meets the requirements, the sealing ring compression meets the requirements, the connecting piece strength is sufficient, and there is no deformation after welding the electrode tabs. Example 6 12 8 3 1.2 The connecting piece structure is reasonably designed, the battery overcurrent meets the requirements, the sealing ring compression meets the requirements, the connecting piece strength is sufficient, and there is no deformation after welding the electrode tabs. Comparative Example 1 1.2 6 1.5 0.8 The first electrode post has a smaller aperture, resulting in a higher welding yield, but the product's overcurrent capability does not meet requirements. Comparative Example 2 6 4 1.5 0.8 The sealing ring lacks sufficient expansion space, posing a risk of battery leakage. Comparative Example 3 8 8 1.1 0.8 Insufficient strength of the connecting piece prevents effective compression of the sealing ring, posing a risk of battery leakage. Comparative Example 4 10 8 1.5 0.3 The connection piece at the welding area of ​​the electrode tab is not strong enough, and there is a risk of downward deformation leading to the electrode tab being inserted backwards. Experimental results show that the structural settings within the parameter range of Examples 1 to 6 result in a reasonable design of the connecting piece 130, meeting the battery overcurrent requirements, satisfying the compression requirements of the sealing ring 140, and ensuring sufficient strength of the connecting piece 130, with no deformation after welding the tabs. In Comparative Example 1, the diameter of the first electrode hole 1311 is small, which, while meeting the welding yield, results in a low battery overcurrent rate, failing to meet the requirements. In Comparative Example 2, the distance W between the outer edge of the third step portion 1312 and the outer edge of the first connecting portion 131 is small, leaving insufficient expansion space for the sealing ring 140 and posing a risk of battery leakage. In Comparative Example 3, the thickness T1 of the first connecting portion 131 is small, leading to insufficient strength of the connecting piece 130 and an inability to effectively compress the sealing ring 140, resulting in a risk of battery leakage. In Comparative Example 4, the thickness T2 of the second connecting portion 132 is small, resulting in insufficient strength and a risk of downward deformation leading to inverted tab insertion during welding.

[0067] See Figure 5 and Figure 6 As shown, according to some embodiments of the present invention, the connecting piece 130 further includes a transition connecting portion 133, the first end of the transition connecting portion 133 is connected to the first connecting portion 131, and the second end of the transition connecting portion 133 is connected to the second connecting portion 132.

[0068] By providing a transition connection 133, the first connection 131 and the second connection 132 can be connected through the transition connection 133, so that the first connection 131 can be connected to the pole post 120, and the second connection 132 can be placed at least partially in the receiving groove 1112 to connect with the pole tab.

[0069] Preferably, the first connecting portion 131, the transition connecting portion 133, and the second connecting portion 132 are integrally formed. This simplifies the processing of the connecting piece 130; for example, it can be formed in one step by stamping, making manufacturing easier.

[0070] See Figure 7 As shown, according to some embodiments of the present invention, the cover plate body 110 is provided with two protruding structures 111 spaced apart along the length direction, and an explosion-proof valve hole 112 is provided between the two protruding structures 111. The explosion-proof valve hole 112 is used to install an explosion-proof valve 150. A second pole post hole 113 is provided on the outer side of each protruding structure 111 along the length direction on the cover plate body 110. The second pole post hole 113 is used to install a pole post 120.

[0071] By providing two protruding structures 111 spaced along the length of the cover plate body 110, the two protruding structures 111 can simultaneously contact the structural components of the battery pack, dispersing the load and thus optimizing the stress conditions when the battery cover plate 100 is applied to the battery and battery pack, preventing excessive stress on a single protruding structure 111 that could deform or be damaged. Simultaneously, the explosion-proof valve hole 112 for installing the explosion-proof valve 150 is located between the two protruding structures 111, and the two second pole hole 113 for installing the pole post 120 are respectively located on the outer side of the protruding structure 111 along the length of the protruding structure 111. This allows the protruding structure 111 to separate the explosion-proof valve 150 and the pole post 120, achieving thermoelectric separation and preventing the explosion-proof valve 150 from affecting the electrical connections such as the pole post 120 when it is activated.

[0072] It should be noted that the explosion-proof valve 150 is used to protect the battery and release pressure when the internal pressure of the battery rises abnormally, so as to prevent the battery from exploding or rupturing.

[0073] See Figure 7 As shown, according to some embodiments of the present invention, a first spacing G1 is provided between the two sides of the explosion-proof valve hole 112 along the length direction and the corresponding side protrusion structure 111, and a second spacing G2 is provided between the second pole hole 113 and the corresponding side protrusion structure 111 along the length direction.

[0074] By setting a first spacing G1 between the explosion-proof valve hole 112 and the corresponding side protrusion 111 on both sides along the length direction, and setting a second spacing G2 between the second pole hole 113 and the corresponding side protrusion 111 along the length direction, the material adjacent to the protrusion 111 can be prevented from breaking during the processing of the battery cover 100 (such as the pole 120 and the explosion-proof valve 150). At the same time, by setting the positional parameters of the explosion-proof valve hole 112 and the second pole hole 113, the strength of the area where the explosion-proof valve 150 is located can be guaranteed, preventing the explosion-proof valve 150 from deforming or cracking due to welding heat, vibration, impact, and thermal runaway. It can also guarantee the strength of the pole 120 and the assembly performance of other structural components of the cover body 110 (such as the outer support pad and the inner support pad).

[0075] The battery provided by this utility model is described below. The battery described below can be referred to in correspondence with the battery cover 100 described above.

[0076] See Figures 8 to 10 As shown, the battery provided in this embodiment of the present invention includes: a battery cover plate 100, a housing 200, and an electrode assembly 300. The battery cover plate 100 is disposed in the housing 200, and the electrode assembly 300 is disposed inside the housing 200.

[0077] The battery provided by this utility model, due to the use of the battery cover plate 100 as described in any of the previous embodiments, can also use the protruding structure 111 to contact the structural components of the battery pack (such as liquid cooling plates) to provide support and fixation for the battery, improve the stability of the battery in the battery pack and improve the overall structural strength of the battery pack. Furthermore, since the battery can bear the load, the clearance space between the battery and the structural components of the battery pack can be eliminated, and the overall height of the battery can be increased to improve the battery capacity. At the same time, since the cover plate body 110 has a receiving groove 1112 formed on the inner side corresponding to the protruding structure 111, and at least a portion of the second connecting portion 132 of the connecting piece 130 is located in the receiving groove 1112, the internal space of the battery housing 200 occupied by at least a portion of the connecting piece 130 can be eliminated, thereby improving the space utilization rate of the battery. When applied to the battery, it can effectively reduce the length of the tabs, eliminate the risk of tab tearing, and the first connecting portion 131 can be used as part of the terminal post 120, which can save the material of the terminal post 120 and reduce the internal resistance of the battery.

[0078] 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, characterized in that, include: The cover plate body has a protruding structure, which forms a contact surface that contacts the structural components of the battery pack. The protruding structure is integrally formed with the cover plate body, and along the thickness direction of the cover plate body, the cover plate body has a receiving groove formed on the inner side corresponding to the protruding structure. A pole post, wherein the pole post is disposed on the cover plate body; The connecting piece includes a first connecting portion and a second connecting portion, the first connecting portion being connected to the second connecting portion, the axial inner end of the pole being connected to the first connecting portion, and at least a portion of the second connecting portion being located within the receiving groove.

2. The battery cover according to claim 1, characterized in that, The first connecting part is provided with a first pole post hole, and the axial inner end of the pole post is located in the first pole post hole.

3. The battery cover according to claim 2, characterized in that, The pole post includes a main body, a first step, and a second step. The first step is located in the main body, and the second step is located in the first step. The second step is located inside the first pole post hole. The first connecting part is provided with a third step, and the axial outer end face of the third step is in contact with the axial inner end face of the first step.

4. The battery cover according to claim 3, characterized in that, Also includes: A sealing ring is fitted onto the third step portion. The axial inner end face of the sealing ring abuts against the axial outer end face of the first connecting portion. The inner end face of the cover plate body and the axial inner end face of the first step portion both abut against the axial outer end face of the sealing ring. The portion of the inner end face of the cover plate body that mates with the sealing ring is coplanar with the axial inner end face of the first step portion.

5. The battery cover according to claim 3, characterized in that, The first pole post hole is a circular hole, and the diameter D of the first pole post hole is 1.5mm≤D≤12mm; And / or, the distance W between the outer edge of the third step portion and the outer edge of the first connecting portion is 5mm ≤ W ≤ 8mm; And / or, the thickness T1 of the first connecting portion is 1.2mm ≤ T1 ≤ 3mm; And / or, the thickness T2 of the second connecting part is 0.4mm≤T2≤1.2mm.

6. The battery cover according to claim 1, characterized in that, The connecting piece further includes a transition connecting portion, the first end of which is connected to the first connecting portion, and the second end of which is connected to the second connecting portion.

7. The battery cover according to claim 6, characterized in that, The first connecting part, the transition connecting part, and the second connecting part are integrally formed.

8. The battery cover according to claim 1, characterized in that, The cover plate body is provided with two protruding structures spaced apart along the length direction, and an explosion-proof valve hole is provided between the two protruding structures. The explosion-proof valve hole is used to install an explosion-proof valve. The cover plate body is provided with a second pole post hole on the outer side of each protruding structure along the length direction. The second pole post hole is used to install a pole post.

9. The battery cover according to claim 8, characterized in that, The explosion-proof valve hole has a first spacing G1 between its two sides along the length direction and the corresponding protrusion structure, and the second pole hole has a second spacing G2 between its two sides along the length direction and the corresponding protrusion structure.

10. A battery, characterized in that, include: The battery cover as described in any one of claims 1 to 9; The housing, wherein the battery cover is disposed on the housing; The electrode assembly is disposed within the housing.

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