Battery cover plate assembly and battery

Abstract

A battery cover plate assembly and a battery. The battery cover plate assembly comprises a cover plate body (100), a combined plastic component (200), and a connecting component. The combined plastic component (200) is disposed on the cover plate body (100). The connecting component is arranged on the side of the combined plastic component (200) facing away from an electrode assembly (102). A tab (1021) of the electrode assembly (102) passes through the cover plate body (100) and the combined plastic component (200) and is then connected to the connecting component. The present application further provides a battery comprising the battery cover plate assembly.

Description

Battery cover assembly and battery

[0001] This application claims priority to Chinese Patent Application No. 202411589671.6, filed with the Chinese Patent Office on November 8, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of battery technology, such as a battery cover assembly and a battery. Background Technology

[0003] In lithium-ion batteries, the connecting piece and one end of the terminal are typically located inside the battery casing, while the other end of the terminal passes through the battery casing and connects to an external circuit to lead out the electrode assembly, enabling the battery to supply power or store energy. A lower plastic component is located between the end of the terminal inside the battery casing and the casing, insulating the terminal from the casing. This lower plastic component is also located inside the battery casing.

[0004] Because the connecting tabs and terminals are located inside the battery casing, they occupy some of the internal space, resulting in limited space for the electrode assembly, low space utilization within the battery casing, and low battery energy density. Furthermore, the connecting tabs are typically welded directly to the tabs and terminals of the electrode assembly without support. This means that when the battery is shaken or subjected to impacts, the connecting tabs may separate from the tabs and terminals, or the tabs may tear, leading to low battery safety. Summary of the Invention

[0005] This application provides a battery cover assembly and a battery, in which the terminals do not occupy the internal space of the casing, increasing the volume of the electrode assembly, improving space utilization, and increasing the energy density of the battery. Furthermore, a connecting structure is provided between the connecting piece and the assembled plastic part, ensuring a stable and secure connection and high battery safety.

[0006] On one hand, this application provides a battery cover assembly, including:

[0007] The cover plate body is provided with a first mounting hole;

[0008] The combined plastic part is partially attached to the end face of the cover plate body on the side away from the electrode group and partially attached to the end face of the cover plate body on the side close to the electrode group. The combined plastic part is provided with through holes.

[0009] The connector is located on the side of the combined plastic part away from the electrode group. The connector is interference-fitted with the side of the combined plastic part away from the electrode group. The electrode lugs of the electrode group pass through the first mounting hole and the through hole and are connected to the connector. The connector is configured to achieve conductive output.

[0010] In some embodiments, the connector includes a connecting piece located on the side of the composite plastic part away from the electrode assembly, having an interference fit with the side of the composite plastic part away from the electrode assembly, and the connecting piece being connected to the electrode tab of the electrode assembly passing through the first mounting hole and the through hole.

[0011] In some embodiments, the connector further includes a pole post located on the side of the connector opposite to the pole group and connected to the connector.

[0012] In some embodiments, the combined plastic part includes a first plastic part body and a second plastic part body. Both the first plastic part body and the second plastic part body are provided with through holes. The first plastic part body is attached to the end face of the cover plate body on the side away from the electrode group, and the second plastic part body is attached to the end face of the cover plate body on the side close to the electrode group.

[0013] And / or, one of the first plastic body and the second plastic body is provided with a connecting part, the connecting part is cylindrical and located in the circumference of the through hole, the connecting part passes through the first mounting hole and fits against the inner wall of the first mounting hole, and the center of the connecting part forms a channel for the electrode tab to pass through.

[0014] In some embodiments, the first plastic body has an annular flange and a limiting flange on the side opposite to the cover plate body. The annular flange is disposed in the circumferential direction of the through hole. The annular flange, the limiting flange and the first plastic body form a mounting groove. At least a portion of the connecting piece is embedded in the mounting groove. The connecting piece is interference-fitted with at least one of the annular flange and the limiting flange.

[0015] In some embodiments, at least one of the annular flange and the limiting flange is provided with a first interference rib, and the first interference rib is in interference fit with the peripheral sidewall of the connecting piece.

[0016] And / or, a second interference rib is provided on the peripheral sidewall of the connecting piece, and the second interference rib is interference-fitted with at least one of the annular flange and the limiting flange.

[0017] In some embodiments, a plurality of first interference ribs are provided and the first interference ribs are strip-shaped. The plurality of first interference ribs extend along the axial direction of the first mounting hole and are evenly spaced on at least one of the annular flange and the limiting flange.

[0018] And / or, multiple second interference ribs are provided and the second interference ribs are strip-shaped. The multiple second interference ribs extend along the axial direction of the first mounting hole and are evenly spaced on the peripheral sidewall of the connecting piece.

[0019] In some embodiments, the end of the first interference rib away from the cover plate body is provided with a guide structure;

[0020] And / or, the end of the second interference rib facing the cover plate body is provided with a guide structure.

[0021] In some embodiments, the interference between the first interference rib and the peripheral sidewall of the connecting piece is h1, and the value of h1 is within the range of: 0.05 mm ≤ h1 ≤ 0.5 mm;

[0022] The interference between the second interference rib and at least one of the annular flange and the limiting flange is h2, and the value of h2 is within the range of: 0.05 mm ≤ h2 ≤ 0.5 mm.

[0023] In some embodiments, the first plastic body is provided with an overlapping portion in the circumferential direction, and the end face of the cover plate body opposite to the second plastic body is provided with a groove, the overlapping portion being embedded in the groove and fitting against the bottom wall of the groove.

[0024] Wherein, along the first direction, the width of the overlap is c;

[0025] The range of values ​​for c satisfies: 0 mm ≤ c ≤ 10 mm;

[0026] And / or, along the second direction, the thickness of the cover body is H, and the distance between the end face of the overlapping part away from the second plastic body and the end face of the cover body away from the second plastic body is b.

[0027] The range of values ​​for b satisfies: -1 mm ≤ b ≤ 0.5H, 1 mm ≤ H ≤ 3 mm.

[0028] In some embodiments, the second plastic body has an electrode tab shaping structure and a support structure on the side near the electrode assembly. The electrode tab shaping structure is arranged in the circumferential direction of the through hole and allows the electrode tab to pass through. The support structure is connected to the electrode tab shaping structure and is configured to abut against the cover plate body.

[0029] On the other hand, this application provides a battery including a housing, an electrode assembly, and a battery cover assembly as described in any of the above embodiments. The battery cover assembly is encapsulated at the opening of the housing, and the electrode assembly is disposed inside the housing. Attached Figure Description

[0030] Figure 1 is a schematic diagram of the battery cover assembly provided in the embodiment of this application;

[0031] Figure 2 is an exploded view of the battery cover assembly provided in the embodiment of this application;

[0032] Figure 3 is an exploded view of the battery cover assembly provided in the embodiment of this application from another perspective;

[0033] Figure 4 is a top view of the battery cover assembly provided in the embodiment of this application;

[0034] Figure 5 is a cross-sectional view of section AA in Figure 4;

[0035] Figure 6 is a magnified view of part B in Figure 5;

[0036] Figure 7 is a cross-sectional view of section CC in Figure 5;

[0037] Figure 8 is a magnified view of a portion of point E in Figure 7;

[0038] Figure 9 is a cross-sectional view of section DD in Figure 7;

[0039] Figure 10 is a magnified view of a portion of point F in Figure 9;

[0040] Figure 11 is a structural schematic diagram of the combined plastic part provided in the embodiment of this application;

[0041] Figure 12 is a magnified view of a portion of point G in Figure 11;

[0042] Figure 13 is a schematic diagram of the battery structure provided in the embodiment of this application.

[0043] In the picture:

[0044] 100. Cover plate body; 110. First mounting hole; 120. Settling tank; 130. Second mounting hole; 140. Support rib; 150. First injection hole;

[0045] 200. Composite plastic part; 201. Through hole; 210. First plastic part body; 211. Overlap; 212. Annular flange; 213. Limiting flange; 2131. Mounting groove; 214. First interference rib; 2141. Guide structure; 220. Second plastic part body; 221. Connecting part; 222. End tab shaping structure; 2221. Guide plate; 2222. Flared mouth; 223. Support structure; 2231. Connecting plate; 2232. Support plate; 224. Vent hole;

[0046] 300, connecting plate; 400, explosion-proof valve;

[0047] 1000. Battery; 101. Housing; 102. Electrode assembly; 1021. Tabs; 103. Battery cover assembly. Detailed Implementation

[0048] The embodiments of this application will now be described with reference to the accompanying drawings, which are some embodiments related to this application. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0049] The following description of embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but rather to illustrate selected embodiments of the present application. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without inventive effort are within the scope of protection of the present application.

[0050] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be redefined and explained in subsequent figures.

[0051] In the description of this application, the terms "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, or the orientation or positional relationship commonly used when the product of this application is in use. They are used only for the convenience of describing this application and for 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. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0052] In the description of this application, unless otherwise expressly specified and limited, the terms "set" and "connection" 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. Those skilled in the art can understand the meaning of the above terms in this application as appropriate.

[0053] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or indicating that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or indicating that the first feature is at a lower horizontal level than the second feature.

[0054] Embodiments of this application are described below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application.

[0055] In some embodiments, this application provides a battery cover assembly, including: a cover body 100 with a first mounting hole 110; a composite plastic part 200, partially attached to the end face of the cover body 100 away from the electrode group and partially attached to the end face of the cover body 100 near the electrode group, the composite plastic part 200 having a through hole 201; a connector located on the side of the composite plastic part 200 away from the electrode group, the connector being interference-fitted with the side of the composite plastic part 200 away from the electrode group, the electrode tabs of the electrode group passing through the first mounting hole 110 and the through hole 201 and then connected to the connector; the connector is configured to achieve conductive output.

[0056] In some embodiments, the connector includes a connecting piece 300, which is located on the side of the combined plastic part 200 opposite to the electrode group. The connecting piece 300 is interference-fitted with the side of the combined plastic part 200 opposite to the electrode group, and the connecting piece 300 is connected to the electrode tab of the electrode group passing through the first mounting hole 110 and the through hole 201. It should be noted that the connecting piece 300 is the core conductive part of the connector, and the interference fit with the combined plastic part 200 and the connection with the electrode tab are both achieved through the connecting piece 300.

[0057] In some embodiments, the connector may further include a terminal post located on the side of the connector 300 opposite to the electrode assembly and connected to the connector 300. The terminal post is configured to be electrically connected to an external source. Exemplarily, the terminal post may be implemented as a busbar.

[0058] As shown in Figures 1-3 and 13, this embodiment provides a battery cover assembly 103, which is connected to a housing 101, and an electrode assembly 102 is disposed within the housing 101. The battery cover assembly 103 includes a cover body 100, a combined plastic part 200, a connecting piece 300, and electrode posts, with the electrode assembly 102 located on the side of the cover body 100 facing the housing 101.

[0059] Part of the composite plastic component 200 is attached to the end face of the cover plate body 100 on the side opposite to the electrode group 102, and part is attached to the end face of the cover plate body 100 on the side close to the electrode group 102. The connecting piece 300 is arranged on the side of the composite plastic component 200 opposite to the electrode group 102. The composite plastic component 200 can insulate the connecting piece 300 from the cover plate body 100 and from the electrode group 102. The cover plate body 100 is provided with a first mounting hole 110, and the composite plastic component 200 is provided with a through hole 201. The electrode tab 1021 of the electrode group 102 passes through the first mounting hole 110 and the through hole 201 and is connected to the connecting piece 300. The electrode post is located on the side of the connecting piece 300 opposite to the electrode group 102 and is connected to the connecting piece 300. That is, the connecting piece 300 is connected to both the tab 1021 and the pole, and the tab 1021 of the pole group 102 is electrically connected to the pole through the connecting piece 300.

[0060] Since the connecting piece 300 and the terminal post are located on the side of the combined plastic part 200 away from the electrode assembly 102, that is, both the connecting piece 300 and the terminal post are located outside the housing 101, they do not occupy the space inside the housing 101. This increases the arrangement space of the electrode assembly 102, resulting in high space utilization and helping to improve the energy density of the battery. In addition, both the connecting piece 300 and the terminal post are flat, and their thickness along the Z-axis direction shown in Figures 1-3 is relatively thin, which can reduce the space occupied. The overall size of the battery cover assembly 103 along the Z-axis direction is small. When the battery with this battery cover assembly 103 is arranged in the whole battery pack, the space utilization is high and the energy density is large.

[0061] In this embodiment, the connecting piece 300 and the combined plastic part 200 are interference-fitted on the side away from the electrode assembly. As a result, the connection structure between the connecting piece 300 and the combined plastic part 200 is relatively stable and firm. Their positions are relatively fixed, and the connecting piece 300 is not prone to positional displacement. Furthermore, the combined plastic part 200 can provide good support for the connecting piece 300, which helps to improve the reliability of the connection between the connecting piece 300 and the electrode tab. The electrode tab is not prone to tearing, and the battery has high safety.

[0062] In some embodiments, referring to Figures 4-6, the combined plastic component 200 in this embodiment includes a first plastic component body 210 and a second plastic component body 220, both of which have through holes 201. The first plastic component body 210 is attached to the end face of the cover plate body 100 opposite to the electrode assembly, and the connecting piece 300 is attached to the end face of the first plastic component body 210 opposite to the electrode assembly, thus insulating the connecting piece 300 from the cover plate body 100 through the first plastic component body 210. The second plastic component body 220 is attached to the end face of the cover plate body 100 near the electrode assembly, thus insulating the electrode assembly from the cover plate body 100 through the second plastic component body 220.

[0063] Referring to Figures 9 and 10, one of the first plastic body 210 and the second plastic body 220 is provided with a connecting portion 221. The connecting portion 221 is cylindrical and located circumferentially in the through hole 201. The first plastic body 210 and the second plastic body 220 are connected by the connecting portion 221, and a channel for the electrode tab to pass through is formed at the center of the connecting portion 221. The connecting portion 221 passes through the first mounting hole 110 and fits against the inner wall of the first mounting hole 110. The connecting portion 221 can insulate the electrode tab from the cover plate body 100. It should be noted that in this embodiment, the first plastic body 210, the second plastic body 220 and the connecting portion 221 can be integrally injection molded onto the cover plate body 100 using a mold. The advantage of this method is that the connection between the combined plastic body 200 and the cover plate body 100 is more reliable, the positioning is accurate, and the assembly steps of the battery cover plate assembly are simplified.

[0064] In other embodiments, the first plastic body 210 and the second plastic body 220 can also be injection molded separately, and then the first plastic body 210 and the second plastic body 220 are assembled with the cover plate body 100. In this case, the combined plastic part 200 can be removed from the cover plate body 100, making it more convenient to replace the combined plastic part 200. Optionally, the connecting part 221 can be provided on the first plastic body 210 or on the second plastic body 220. Alternatively, both the first plastic body 210 and the second plastic body 220 can be provided with connecting parts 221, and both connecting parts 221 extend into the first mounting hole 110 and are nested together, thereby providing a double insulation structure between the electrode tab and the cover plate body 100, resulting in better insulation.

[0065] Referring again to Figures 2 and 3, this embodiment has two electrode groups. Each electrode group has a positive electrode tab and a negative electrode tab at both ends along its length. The positive electrode tabs of the two electrode groups are located on the same side, and the negative electrode tabs of the two electrode groups are located on the same side. There are two first plastic parts bodies 210, two connecting pieces 300, and two electrode posts. The two first plastic parts bodies 210 are respectively located at both ends of the cover plate body 100 along the X-axis direction shown in Figure 2. Each first plastic part body 210 has a connecting piece 300 on the side facing away from the cover plate body 100, and each connecting piece 300 has an electrode post on the side facing away from the cover plate body 100, one of which is a positive electrode post and the other is a negative electrode post. Each first plastic part body 210 has two through holes 201, which are arranged at intervals along the Y-axis direction shown in Figure 2, that is, there are four through holes 201 in total. Each through hole 201 has a connecting portion 221 circumferentially.

[0066] A second plastic body 220 is provided, with two through holes 201 at each end along the X-axis direction shown in Figure 2. The through holes 201 on the second plastic body 220 correspond one-to-one with the through holes 201 on the first plastic body 210. A cover plate body 100 is provided, with two first mounting holes 110 at each end along the X-axis direction shown in Figure 2, i.e., four first mounting holes 110 are provided. The through holes 201 correspond one-to-one with the first mounting holes 110. The positive electrode tab of the electrode group passes through one through hole 201 of the second plastic body 220, one first mounting hole 110 of the cover plate body 100, and one through hole 201 of the first plastic body 210, and is connected to the positive electrode post. The negative electrode tab of the electrode group passes through one through hole 201 of the second plastic body 220, one first mounting hole 110 of the cover plate body 100, and another through hole 201 of the first plastic body 210, and is connected to the negative electrode post. This allows the tabs of the two electrode groups to be led out from inside the housing and connected to the connecting piece 300 on the outside of the housing, without occupying the internal space of the housing, resulting in high space utilization and high volumetric energy density of the electrode groups.

[0067] Referring to Figures 5-8, in this embodiment, the first plastic body 210 has an annular flange 212 and a limiting flange 213 on the side opposite to the cover body 100. There are two annular flanges 212, spaced apart along the Y-axis direction shown in Figure 7. There are also two limiting flanges 213, spaced apart along the X-axis direction shown in Figure 7. The annular flange 212 is annular and surrounds the circumference of the through hole 201. Each end of the limiting flange 213 is connected to one of the annular flanges 212. The annular flange 212, the limiting flange 213, and the first plastic body 210 form a mounting groove 2131. At least a portion of the connecting piece 300 is embedded in the mounting groove 2131, thereby reducing the size of the battery cover assembly along the Z-axis direction in Figure 5, reducing the space occupied by the battery cover assembly, and improving the energy density of the entire battery pack. Meanwhile, the annular flange 212 and the limiting flange 213 can also limit the connecting piece 300 to ensure that the connecting piece 300 is accurately positioned in the Y-axis and X-axis directions.

[0068] In some embodiments, the connecting piece 300 is interference-fitted with at least one of the annular flange 212 and the limiting flange 213, thereby achieving assembly and fixation between the connecting piece 300 and the assembled plastic part 200.

[0069] Optionally, in this embodiment, the annular flange 212 is provided with a first interference rib 214, and the first interference rib 214 on the annular flange 212 is interference-fitted with the peripheral sidewall of the connecting piece 300 along the Y-axis direction in Figure 7. The interference amount between the first interference rib 214 and the peripheral sidewall of the connecting piece 300 is h1, and the value range of h1 satisfies: 0.05 mm ≤ h1 ≤ 0.5 mm. For example, the value of h1 can be 0.05 mm, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm or 0.5 mm. It is important to note that the value of h1 should not be too small, otherwise the connection strength between the combined plastic part 200 and the connecting piece 300 will be low, the connection between the two will not be firm, and the connecting piece 300 may detach from the combined plastic part 200, posing a safety risk. The value of h1 should also not be too large, otherwise the assembly between the connecting piece 300 and the combined plastic part 200 will be more difficult, which will not be conducive to installation and may also cause the combined plastic part 200 to deform and the flatness of the battery cover assembly to be poor.

[0070] In some embodiments, multiple first interference ribs 214 are provided on the annular flange 212, and the first interference ribs 214 are strip-shaped. For example, the first interference ribs 214 can be straight, wavy, etc. The multiple first interference ribs 214 extend along the axial direction of the first mounting hole 110 (the Z-axis direction shown in FIG. 5), and the multiple first interference ribs 214 are evenly spaced on the annular flange 212. Alternatively, the first interference ribs 214 can also be inclined along a direction deviating from the axial direction of the first mounting hole 110. The cross-section of each first interference rib 214 (the cross-section along the XY plane shown in FIG. 7) is triangular, one sidewall of the first interference rib 214 is connected to the annular flange 212, and the edge opposite to the sidewall is interference-fitted with the peripheral sidewall of the connecting piece 300 along the Y-axis direction in FIG. 7. The edge of the first interference rib 214 opposite to the sidewall can be smoothly transitioned by an arc surface, thereby avoiding the first interference rib 214 scratching the connecting piece 300.

[0071] Referring to Figures 11 and 12, a guide structure 2141 is provided at the end of the first interference rib 214 facing away from the cover plate body 100. The guide structure 2141 facilitates the insertion of the connecting piece 300 into the mounting groove 2131, simplifying assembly. Exemplarily, the guide structure 2141 can be an inclined surface at the end of the first interference rib 214, which slopes towards the bottom of the mounting groove 2131 (the bottom of the mounting groove 2131 is the end face of the first plastic part body 210 facing away from the cover plate body 100). In some embodiments, the guide structure 2141 can also be an arcuate surface at the end of the first interference rib 214.

[0072] In other embodiments, not only can the first interference rib 214 be provided on the annular flange 212, but the first interference rib 214 can also be provided on the limiting flange 213. The first interference rib 214 on the limiting flange 213 is interference-fitted with the peripheral sidewall of the connecting piece 300 along the X-axis direction in Figure 7. The interference amount between the first interference rib 214 and the peripheral sidewall of the connecting piece 300 is also h1, and the value range of h1 satisfies: 0.05mm≤h1≤0.5mm. Optionally, multiple first interference ribs 214 can be provided on the limiting flange 213. Multiple first interference ribs 214 extend along the axial direction of the first mounting hole 110 (the Z-axis direction shown in Figure 5), and multiple first interference ribs 214 are evenly spaced on the limiting flange 213.

[0073] The following example, which only sets the first interference rib 214 on the combined plastic part 200, illustrates the trial assembly of some battery cover assembly samples in some implementation schemes to explore the influence of the value of parameter h1 on the assembly result of connecting piece 300 and combined plastic part 200. The results are shown in Table 1.

[0074] Table 1

[0075]

[0076] The trial assembly results show that in sample 1, the value of h1 is less than the minimum value of its set range of 0.05mm≤h1≤0.5mm. The connecting piece 300 cannot be fixedly connected to the combined plastic part 200. After assembly, the connecting piece 300 is easy to fall off the combined plastic part 200. Moreover, after the electrode tab is welded to the connecting piece 300, it is easy to shake, which will cause the electrode tab to tear and the battery cover plate assembly product to be defective.

[0077] In samples 2, 3, 4, 5, 6, 7, 8, 9, 10, and 11, the value of h1 is within its set range of 0.05mm ≤ h1 ≤ 0.5mm. The connecting piece 300 and the combined plastic part 200 are easy to assemble, and after assembly, the connecting piece 300 and the combined plastic part 200 are stably connected. The connecting piece 300 is not easy to fall off the combined plastic part 200. After the electrode tab is welded to the connecting piece 300, the electrode tab is stably fixed and is not easy to shake. The reliability of the connection between the electrode tab and the connecting piece 300 is high, and the battery cover assembly product is good.

[0078] In sample 12, the value of h1 is greater than the maximum value of its set range of 0.05mm≤h1≤0.5mm, making it difficult to assemble the connecting piece 300 and the combined plastic part 200. During assembly, metal wires may be generated on the peripheral sidewall of the connecting piece 300, posing a short circuit risk to the electrode assembly and resulting in a defective battery cover assembly.

[0079] In other embodiments, a second interference rib is provided on the peripheral sidewall of the connecting piece 300, and the second interference rib is interference-fitted with at least one of the annular flange 212 and the limiting flange 213. For example, multiple second interference ribs may be provided, and each of the multiple second interference ribs is strip-shaped, extending along the axial direction of the first mounting hole 110, and evenly spaced on the peripheral sidewall of the connecting piece 300. By providing interference fit structures on both the connecting piece 300 and the combined plastic part 200, the connection strength between the connecting piece 300 and the combined plastic part 200 is improved, and the fixation between the two is more stable and firm. Furthermore, a guide structure 2141 is also provided at the end of the second interference rib facing the cover plate body 100, and this guide structure 2141 is the same as the guide structure 2141 on the first interference rib 214. By providing the guide structure 2141 at the end of the second interference rib facing the cover plate body 100, it is easier to insert the connecting piece 300 into the mounting groove 2131 of the combined plastic part 200, making assembly easier. Alternatively, in other alternative embodiments, the second interference rib may be provided only on the connecting piece 300, and the first interference rib 214 may not be provided on the combined plastic part 200.

[0080] Optionally, the interference between the second interference rib and at least one of the annular flange 212 and the limiting flange 213 is h2, and the value of h2 satisfies the following range: 0.05mm ≤ h2 ≤ 0.5mm. For example, the value of h2 can be 0.05mm, 0.1mm, 0.2mm, 0.3mm, 0.4mm, or 0.5mm. It should be noted that the value of h2 should not be too small, otherwise the connection strength between the combined plastic part 200 and the connecting piece 300 will be low, the connection between the two will not be firm, and the connecting piece 300 may detach from the combined plastic part 200, posing a safety risk; the value of h2 should also not be too large, otherwise the assembly between the connecting piece 300 and the combined plastic part 200 will be more difficult, which is not conducive to installation, and may also cause deformation of the combined plastic part 200 and poor flatness of the battery cover assembly.

[0081] The following example demonstrates the trial assembly of some battery cover assembly samples in some implementation schemes, using the second interference rib only on the peripheral sidewall of the connecting piece 300 as an example, to investigate the influence of the value of parameter h2 on the assembly result of the connecting piece 300 and the combined plastic part 200. The results are shown in Table 2.

[0082] Table 2

[0083]

[0084] The trial assembly results show that in sample 1, the value of h2 is less than the minimum value of its set range of 0.05mm≤h2≤0.5mm. The connecting piece 300 cannot be fixedly connected to the combined plastic part 200. After assembly, the connecting piece 300 is easy to fall off the combined plastic part 200. Moreover, after the electrode tab is welded to the connecting piece 300, it is easy to shake, which will cause the electrode tab to tear and the battery cover plate assembly product to be defective.

[0085] In samples 2, 3, 4, 5, 6, 7, 8, 9, 10, and 11, the value of h2 is within its set range of 0.05mm ≤ h2 ≤ 0.5mm. The connecting piece 300 and the combined plastic part 200 are easy to assemble, and after assembly, the connecting piece 300 and the combined plastic part 200 are stably connected. The connecting piece 300 is not easy to fall off the combined plastic part 200. After the electrode tab is welded to the connecting piece 300, the electrode tab is stably fixed and is not easy to shake. The reliability of the connection between the electrode tab and the connecting piece 300 is high, and the battery cover assembly product is good.

[0086] In sample 12, the value of h2 is greater than the maximum value of its set range 0.05mm≤h2≤0.5mm, making it difficult to assemble the connecting piece 300 and the combined plastic part 200. During assembly, metal wires may be generated on the peripheral sidewall of the connecting piece 300, posing a short circuit risk to the electrode assembly and resulting in a defective battery cover assembly.

[0087] Referring again to Figures 6 and 10, in this embodiment, the first plastic body 210 has a circumferentially lapped portion 211, and the end face of the cover plate body 100 opposite to the second plastic body 220 has a recessed groove 120. The lapped portion 211 is embedded in the recessed groove 120 and fits against the bottom wall of the recessed groove 120. On the one hand, the lapped portion 211 can limit the first plastic body 210 along the axial direction of the first mounting hole 110 (the Z-axis direction shown in Figure 2), ensuring accurate positioning between the first plastic body 210 and the cover plate body 100, and improving the assembly accuracy of the battery cover assembly. On the other hand, the recessed groove 120 allows part of the first plastic body 210 to be embedded in the cover plate body 100, reducing the size of the battery cover assembly along the axial direction of the first mounting hole 110, thereby improving the space utilization of the entire battery pack and increasing its energy density.

[0088] Along the first direction (i.e., the Y-axis direction shown in Figure 9), the width of the overlapping portion 211 is c, and the value of c is within the range of 0mm ≤ c ≤ 10mm. Along the third direction (i.e., the X-axis direction shown in Figure 5), the width of the overlapping portion 211 is also c, and the value of c is within the range of 0mm ≤ c ≤ 10mm. For example, the value of c can be 0mm, 1mm, 2mm, 5mm, 8mm, or 10mm, etc. The width of the overlapping portion 211 along the first direction and the width of the overlapping portion 211 along the third direction can be the same or different, as long as the value of c is within the above-mentioned range. By controlling the width c of the overlapping portion 211 within the above-mentioned range, the assembly structure between the first plastic body 210 and the cover plate body 100 can be kept stable, and the weight of the first plastic body 210 can be relatively reduced, thus reducing material costs. It should be noted that when the width c of the overlap 211 is 0, the circumferential edge of the first plastic part body 210 overlaps with the cover plate body 100, which can also ensure successful assembly of the first plastic part body 210 and the cover plate body 100. However, when the width c of the overlap 211 is greater than 10mm, it may occupy more space within the recess 120, affecting the assembly of the cover plate body 100 with other structural components.

[0089] In some embodiments, along the second direction (i.e., the Z-axis direction shown in FIG. 5), the thickness of the cover plate body 100 is H, and the distance between the end face of the overlapping portion 211 facing away from the second plastic body 220 and the end face of the cover plate body 100 facing away from the second plastic body 220 is b. The value of b satisfies the following range: -1mm ≤ b ≤ 0.5H, 1mm ≤ H ≤ 3mm. Here, "-" indicates that the end face of the overlapping portion 211 facing away from the second plastic body 220 extends beyond the end face of the cover plate body 100 facing away from the second plastic body 220. For example, when H is 1mm, the value of b can be -1mm, -0.5mm, 0mm, 0.1mm, 0.3mm, or 0.5mm. It is important to note that the value of b should not be too large. If the value of b is greater than 0.5H, the depth of the recess 120 will be too large, affecting the mechanical strength of the cover body 100. The cover body 100 will be prone to deformation or breakage when subjected to impacts, leading to battery failure. The value of b should also not be too small. If the value of b is less than -1mm, it indicates that the end face of the overlapping part 211 facing away from the second plastic body 220 extends too far beyond the recess 120, which is detrimental to improving space utilization and may affect the assembly between the first plastic body 210 and other structural components. In other embodiments, the value of H can also be 2mm, 2.5mm, or 3mm, etc., with the value of b taking the range mentioned above.

[0090] The following tests, using samples of battery cover assemblies, examine the dimensional design of the overlapping portion 211 and the cover body 100 to investigate the influence of the parameters H, b, and c on the insulation performance and structural strength of the battery cover assembly.

[0091] The withstand voltage test refers to applying a high voltage (e.g., 1500 volts) between the cover plate body 100 and the first plastic part body 210 of the combined plastic part 200 using an AC withstand voltage tester for 2 seconds, and then detecting the leakage current value. When the leakage current value is less than 2 mA and the combined plastic part 200 is not broken down, the battery cover plate assembly has good insulation performance.

[0092] The thrust test refers to fixing the cover plate body 100 and applying a thrust towards the cover plate body 100 to the assembled plastic part 200. When the thrust applied to the assembled plastic part 200 is greater than 1200 Newtons, and the deformation of the cover plate body 100 along the thrust direction is less than 0.5mm, the battery cover plate assembly has high structural strength and meets the product requirements.

[0093] The dimensional parameters and test results of the battery cover assembly are shown in Table 3 below.

[0094] Table 3

[0095]

[0096] In sample 1, the value of b is -2.0 mm and the value of H is 2.0 mm. The value of b is less than the minimum value of -1 mm ≤ b ≤ 0.5 H. At this time, the end face of the overlapping part 211 on the side away from the second plastic body 220 exceeds the end face of the cover plate body 100 on the side away from the second plastic body 220 by too much. This affects the height design of the electrode post along the second direction, which is not conducive to improving the energy density of the battery. It is not recommended to use it, and the product is defective.

[0097] In sample 2, the value of c is -0.5mm, which is less than the minimum value of 0mm≤c≤10mm. Other parameters H and b meet their corresponding size range limits. At this time, the insulation performance between the first plastic body 210 and the cover plate body 100 cannot be guaranteed, the pressure resistance test fails, there is a risk of pressure resistance failure, it is not recommended to use, and the product is defective.

[0098] In samples 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, and 15, the values ​​of parameters H, b, and c all meet their respective size range limitations. At this time, the insulation performance between the first plastic body 210 and the cover plate body 100 is good, the pressure resistance test is passed, and the structural strength of the cover plate body 100 is high, the thrust test is passed. It is recommended to use the product, and the product is good.

[0099] In sample 16, the value of c is 13.0 mm, which is greater than the maximum value of 0 mm ≤ c ≤ 10 mm. Other parameters H and b meet their corresponding size range limits. At this time, the insulation performance between the first plastic body 210 and the cover plate body 100 is good, and the withstand voltage test is passed. However, the width of the overlap 211 of the first plastic body 210 is large, which increases the material usage of the first plastic body 210 and the pole, resulting in higher costs. It is not recommended to use this product, which is defective.

[0100] In sample 17, the value of b is 1.5 mm and the value of H is 2.0 mm. The value of b is greater than 0.5 H, which does not meet the size limit of -1 mm ≤ b ≤ 0.5 H. At this time, the opening depth of the groove 120 on the cover plate body 100 is too large, the structural strength of the cover plate body 100 is low, the thrust test is not passed, and it is not recommended to use it. The product is defective.

[0101] Referring again to Figures 3, 9, and 10, the second plastic body 220 has an electrode lug shaping structure 222 and a support structure 223 on the side near the electrode assembly. The electrode lug shaping structure 222 is positioned circumferentially around the through hole 201, allowing the electrode lug to pass through. The electrode lug shaping structure 222 allows the electrode lug to be contained within the through hole 201 of the combined plastic body 200, resulting in a well-formed electrode lug and preventing short circuits between the electrode lug and the cover plate body 100, thus avoiding safety risks. The support structure 223 is connected to the electrode lug shaping structure 222 and is positioned to abut against the cover plate body 100. The support structure 223 provides good support for the electrode lug shaping structure 222, which has high mechanical strength and is not easily deformed.

[0102] For example, the tab shaping structure 222 includes two guide plates 2221, which are respectively disposed on both sides of the through hole 201 along the Y-axis direction shown in Figure 9. The two guide plates 2221 are inclined in a direction away from the axis of the through hole 201. Along the direction away from the through hole 201, a flared mouth 2222 is formed between the two guide plates 2221. The larger end of the flared mouth 2222 faces the electrode assembly, and the smaller end of the flared mouth 2222 is connected to the second plastic body 220. The tab is inserted into the flared mouth 2222. During installation, the tab is inserted into the through hole 201 from the larger end of the flared mouth 2222. Along the direction close to the through hole 201, the opening of the flared mouth 2222 gradually narrows. Therefore, when the electrode is inserted into the flared mouth 2222, the guide plates 2221 on both sides of the flared mouth 2222 can effectively gather the electrode into the through hole 201. The electrode has a good shape and is not prone to short circuit and overlap with the cover plate body 100, thus ensuring high safety.

[0103] The angle between the axis of the guide plate 2221 and the through hole 201 is α, and the value of α is in the range of 45°≤α≤87°. For example, the value of α can be 45°, 50°, 60°, 70°, 80°, 87°, etc. By controlling the value of α within the above range, it can be ensured that the tab shaping structure 222 can well contain the tab within the through hole 201. It should be noted that when the value of α is too large, it cannot achieve a good shaping effect on the tab; when the value of α is too small, it will increase the dimension of the second plastic part body 220 along the Z-axis direction shown in Figure 9, which is not conducive to improving space utilization.

[0104] The support structure 223 includes a connecting plate 2231 and a support plate 2232. The connecting plate 2231 is connected to the tab shaping structure 222, and the support plate 2232 is disposed on the end face of the connecting plate 2231 near the cover plate body 100, and abuts against the cover plate body 100. The support structure 223 provides good support for the tab shaping structure 222, ensuring that the tab shaping structure 222 has high mechanical strength and is not easily deformed.

[0105] Along the Y-axis direction (i.e., the first direction) shown in Figure 9, the distance between the end face of the support plate 2232 facing away from the guide plate 2221 and the end of the guide plate 2221 near the support plate 2232 is denoted as e, and the value of e ranges from 0.5mm ≤ e ≤ 20mm. For example, the value of e can be 0.5mm, 1.0mm, 5mm, 10mm, 15mm, or 20mm. The value of e can be adjusted according to the dimension of the second plastic body 220 along the Y-axis direction. It should be noted that the value of e should not be too small, otherwise the connecting plate 2231 will be too sharp and may easily puncture the electrode tabs or electrode assembly. The value of e should also not be too large, otherwise it will occupy the space of the electrode tab shaping structure 222 along the Y-axis direction, increasing the dimension of the electrode tab shaping structure 222 along the Z-axis direction shown in Figure 9, which may easily damage the electrode assembly.

[0106] In some embodiments, along the second direction (i.e., the Z-axis direction shown in FIG9), the distance between the end face of the connecting plate 2231 away from the cover plate body 100 and the end face of the second plastic body 220 away from the cover plate body 100 is f, and the value of f is in the range of 0mm≤f≤5mm. For example, the value of f can be 0mm, 0.5mm, 1.0mm, 1.5mm, 2.0mm, 3.0mm, 4.0mm or 5.0mm. It should be noted that the value of f cannot be less than 0mm, otherwise the tab shaping structure 222 will protrude from the end face of the second plastic body 220 near the electrode assembly, which may easily damage the electrode assembly. The value of f should also not be too large, otherwise the tilt angle of the guide plate 2221 will be too large, the structure of the tab will be relatively loose, the shaping effect of the tab shaping structure 222 on the tab will be poor, the shape of the tab in the housing will be poor, and it will be easy to short-circuit with the housing.

[0107] Optionally, in this embodiment, four tab shaping structures 222 are provided, each corresponding to a through hole 201. Each through hole 201 has one tab shaping structure 222 circumferentially. Multiple support structures 223 are provided, with two support structures 223 respectively located at both ends of the second plastic body 220 along the Y-axis direction shown in Figure 9, and connected to the tab shaping structure 222 on one side thereon. The remaining support structures 223 are arranged between two adjacent tab shaping structures 222 along the Y-axis direction shown in Figure 9. One or more support structures 223 may be provided between every two tab shaping structures 222; this is illustrated by the example of one support structure 223 between every two tab shaping structures 222. Each tab shaping structure 222 has support structures 223 on both sides along the Y-axis direction for support, ensuring high mechanical strength and preventing deformation of the tab shaping structure 222.

[0108] In some embodiments, in the support structure 223 located near the end of the second plastic body 220 along the Y-axis direction shown in FIG9, the first end of the connecting plate 2231 is connected to the end of the guide plate 2221 of the tab shaping structure 222 near the pole assembly, the second end of the connecting plate 2231 is connected to the support plate 2232, and the support plate 2232 is connected to the edge of the connecting plate 2231 near the second plastic body 220 along the Y-axis direction shown in FIG9. The support plate 2232 is disposed on the end face of the connecting plate 2231 near the cover plate body 100, and abuts against the cover plate body 100 through the support plate 2232, thereby providing support for the tab shaping structure 222 connected thereto. In the support structure 223 located between two adjacent tab shaping structures 222, the two ends of the connecting plate 2231 are respectively connected to the end of the guide plate 2221 of one tab shaping structure 222 near the pole group. The support plate 2232 is connected to the middle of the connecting plate 2231 and is disposed on the end face of the connecting plate 2231 near the cover plate body 100. The support plate 2232 abuts against the top wall cover plate body 100, thereby providing support for the two adjacent tab shaping structures 222.

[0109] Referring again to Figures 2 and 3, the battery cover assembly in this embodiment also includes an explosion-proof valve 400. The cover body 100 has a second mounting hole 130, and the explosion-proof valve 400 is disposed within the second mounting hole 130. The second plastic body 220 has a vent 224 corresponding to the position of the second mounting hole 130. Along the Z-axis direction shown in Figure 2, the projection of the vent 224 onto the cover body 100 coincides with the projection of the explosion-proof valve 400 onto the cover body 100. Therefore, when the pressure on one side of the cover body 100 exceeds the opening pressure of the explosion-proof valve 400, high-temperature, high-pressure gas and liquid can be discharged from the battery through the vent 224 and the explosion-proof valve 400, avoiding the risk of explosion and ensuring high safety. In addition, the second mounting hole 130 also has crisscrossing support ribs 140, which can support the cover body 100 and improve the structural strength of the cover body 100 at the location of the second mounting hole 130. In some embodiments, multiple vent holes 224 on the second plastic body 220 may be provided at intervals to increase the flow area, so that high-temperature and high-pressure gases and liquids can be discharged quickly and flow smoothly.

[0110] In some embodiments, the cover plate body 100 is further provided with a first injection hole 150, and the second plastic body 220 is provided with a second injection hole at a position corresponding to the first injection hole 150. Along the Z-axis direction shown in FIG2, the projection of the first injection hole 150 on the cover plate body 100 coincides with the projection of the second injection hole on the cover plate body 100. After the battery cover plate assembly is assembled with the housing, electrolyte can be injected into the housing through the first injection hole 150 and the second injection hole so that the electrode assembly can be immersed in the electrolyte. After the injection is completed, an injection plug can be inserted into the first injection hole 150 and / or the second injection hole to seal the first injection hole 150 and / or the second injection hole and prevent electrolyte leakage. Exemplarily, the injection plug is made of a material with elastic deformation capability such as rubber.

[0111] In some embodiments, the cover body 100 of the battery cover assembly of this application can be replaced by a battery housing, that is, a battery housing assembly can also be provided, in which the mounting carrier of the combined plastic part 200 (including the first plastic part body 210 and the second plastic part body 220) is changed to the battery housing. Exemplarily, the battery housing has a hollow interior forming a mounting cavity, with an opening on one side for the electrode assembly to be inserted, and a first mounting hole corresponding to the first mounting hole 110 of the original cover body 100 is provided on one wall of the housing; part of the combined plastic part 200 is located outside the mounting cavity and fits against the end face of the housing away from the electrode assembly, and part of it is located inside the mounting cavity and fits against the end face of the housing near the electrode assembly. The combined plastic part 200 still has a through hole 201 for the electrode tab to pass through; the connector is located on the side of the combined plastic part 200 away from the housing and is interference-fitted with the side of the combined plastic part 200 away from the electrode assembly. The electrode tab of the electrode assembly passes through the first mounting hole of the housing and the through hole 201 of the combined plastic part 200 and is connected to the connector. The connector is configured to realize conductive output.

[0112] As shown in Figure 13, this embodiment also provides a battery 1000, including a housing 101, an electrode assembly 102, and a battery cover assembly 103 as described in any of the above embodiments. The housing 101 has an opening on one side, through which the electrode assembly 102 is inserted into the housing 101. The battery cover assembly 103 is disposed at the opening of the housing 101 and welded to the housing 101. The battery cover assembly 103 and the housing 101 form a closed accommodating space to encapsulate the electrode assembly 102 within the accommodating space.

[0113] By employing the aforementioned battery cover assembly 103, the connectors (connecting piece 300 and terminal post) are positioned outside the housing, thus not occupying the internal space of the housing 101. This allows for an increase in the volume of the electrode assembly 102, resulting in a higher energy density for the battery 1000. Furthermore, both the connecting piece 300 and the terminal post are flat, leading to a smaller overall dimension of the battery cover assembly 103 along the Z-axis. When the battery 1000 with this battery cover assembly 103 is arranged within a battery pack, space utilization is high, and energy density is high. In addition, by using an interference fit between the connecting piece 300 and the combined plastic part 200 on the side opposite to the electrode assembly 102, the connection between the connecting piece 300 and the combined plastic part 200 is more stable and robust. The connecting piece 300 is less prone to positional displacement, and the connection between the connecting piece 300 and the terminal tab 1021 is highly reliable, resulting in high battery safety.

Claims

1. A battery cover assembly, comprising: The cover plate body is provided with a first mounting hole; The combined plastic part is partially attached to the end face of the cover plate body on the side away from the electrode group and partially attached to the end face of the cover plate body on the side close to the electrode group. The combined plastic part is provided with through holes. A connector is located on the side of the combined plastic part away from the electrode group. The connector is interference-fitted with the side of the combined plastic part away from the electrode group. The electrode tabs of the electrode group pass through the first mounting hole and the through hole and are connected to the connector. The connector is configured to achieve conductive output.

2. The battery cover assembly according to claim 1, wherein, The connector includes a connecting piece located on the side of the combined plastic part away from the electrode group, and is interference-fitted with the side of the combined plastic part away from the electrode group. The connecting piece is connected to the electrode lug of the electrode group passing through the first mounting hole and the through hole.

3. The battery cover assembly according to claim 2, wherein, The connector also includes a pole post, which is located on the side of the connector piece away from the pole group and is connected to the connector piece.

4. The battery cover assembly according to any one of claims 1-3, wherein, The combined plastic component includes a first plastic component body and a second plastic component body. Both the first plastic component body and the second plastic component body are provided with the through hole. The first plastic component body is attached to the end face of the cover plate body on the side away from the electrode group, and the second plastic component body is attached to the end face of the cover plate body on the side close to the electrode group.

5. The battery cover assembly according to claim 1 or 4, wherein, One of the first plastic body and the second plastic body of the combined plastic part is provided with a connecting part. The connecting part is cylindrical and located around the through hole. The connecting part passes through the first mounting hole and fits against the inner wall of the first mounting hole. The center of the connecting part forms a channel for the tab to pass through.

6. The battery cover assembly according to claim 4 or 5, wherein, The first plastic part body has an annular flange and a limiting flange on the side opposite to the cover plate body. The annular flange is disposed in the circumference of the through hole. The annular flange, the limiting flange and the first plastic part body form a mounting groove. At least a portion of the connecting piece is embedded in the mounting groove. The connecting piece is interference-fitted with at least one of the annular flange and the limiting flange.

7. The battery cover assembly according to claim 6, wherein, Includes at least one of the following: At least one of the annular flange and the limiting flange is provided with a first interference rib, and the first interference rib is interference-fitted with the peripheral sidewall of the connecting piece. Alternatively, a second interference rib is provided on the peripheral sidewall of the connecting piece, and the second interference rib is interference-fitted with at least one of the annular flange and the limiting flange.

8. The battery cover assembly according to claim 7, wherein, Includes at least one of the following: The first interference rib is provided in multiple ways and is strip-shaped. The multiple first interference ribs extend along the axial direction of the first mounting hole and are evenly spaced on at least one of the annular flange and the limiting flange. Alternatively, multiple second interference ribs may be provided and the second interference ribs may be strip-shaped, with the multiple second interference ribs extending along the axial direction of the first mounting hole and evenly spaced on the peripheral sidewall of the connecting piece.

9. The battery cover assembly according to claim 7, wherein, Includes at least one of the following: The end of the first interference rib that faces away from the cover plate body is provided with a guide structure; Alternatively, the end of the second interference rib facing the cover plate body is provided with a guide structure.

10. The battery cover assembly according to claim 7, wherein, The interference between the first interference rib and the peripheral sidewall of the connecting piece is h1; The value range of h1 satisfies: 0.05 mm ≤ h1 ≤ 0.5 mm; The interference between the second interference rib and at least one of the annular flange and the limiting flange is h2; The range of h2 values ​​satisfies: 0.05 mm ≤ h2 ≤ 0.5 mm.

11. The battery cover assembly according to claim 4 or 5, wherein, The first plastic part body has an overlapping part in the circumferential direction, and the cover plate body has a groove on the end face opposite to the second plastic part body. The overlapping part is embedded in the groove and fits against the bottom wall of the groove. The dimensions of the battery cover assembly include at least one of the following: Along the first direction, the width of the overlapping portion is c, and the value of c is within the range of: 0 mm ≤ c ≤ 10 mm; Alternatively, along the second direction, the thickness of the cover plate body is H, and the distance between the end face of the overlapping portion away from the second plastic body and the end face of the cover plate body away from the second plastic body is b, where the value of b is within the range of: -1 mm ≤ b ≤ 0.5H, 1 mm ≤ H ≤ 3 mm.

12. The battery cover assembly according to claim 4 or 5, wherein, The second plastic body has an electrode lug shaping structure and a support structure on the side near the electrode assembly. The electrode lug shaping structure is arranged in the circumference of the through hole and allows the electrode lug to pass through. The support structure is connected to the electrode lug shaping structure and is configured to abut against the cover plate body.

13. A battery comprising a housing, an electrode assembly, and a battery cover assembly according to any one of claims 1-12, the battery cover assembly being encapsulated at an opening in the housing, the electrode assembly being disposed within the housing.

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