Battery cell cover plate and battery cell

Abstract

The utility model relates to the technical field of batteries, in particular to a battery cell cover plate and a battery cell. The battery cell cover plate comprises a cover plate main body provided with a mounting hole; the polar column comprises a polar column main body and a polar column bottom plate which form a split structure, the polar column bottom plate is arranged on one side, facing the interior of the battery cell, of the cover plate main body, a step hole is formed in the polar column bottom plate, and the polar column main body penetrates through the step hole and the mounting hole, so that the polar column is assembled on the cover plate main body. According to the utility model, the pole is arranged to be of a split structure comprising the pole main body and the pole bottom plate, and the pole main body penetrates through the mounting holes in the pole bottom plate and the cover plate main body, so that the assembling precision of the pole bottom plate is not influenced in the riveting process of the pole main body, and the flatness of the pole bottom plate is ensured; and the condition that the pole bottom plate tilts after being riveted is avoided, so that the sealing performance of the battery cell cover plate is ensured, and the yield of battery cell production is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery cover and a battery. Background Art

[0002] Lithium-ion batteries are currently widely used in various fields such as transportation power supply, electric energy storage power supply, new energy energy storage power supply, aerospace and military industry due to their large capacity, high operating voltage, strong charge retention ability and long cycle life.

[0003] As lithium batteries are used more and more widely, the power battery market has higher and higher requirements for fast charging, and the overcurrent capabilities that the cover and pole have to withstand are also correspondingly higher. Therefore, for the riveted cover, the size of the pole bottom plate is getting larger and larger, which makes the difficulty of manufacturing and assembling the cover also increase. The existing pole structure will cause the bottom plate of the pole to warp up during riveting, and the uneven bottom plate seriously affects the sealing performance of the pole. Utility Model Content

[0004] In view of this, the purpose of the present application is to provide a battery cell cover and a battery cell to solve the problem that the cover of the existing battery cell will cause the bottom plate of the pole to warp up during riveting assembly, and the uneven bottom plate of the pole will seriously affect the sealing performance of the pole, thereby causing a low battery cell yield.

[0005] The first aspect of the utility model provides a battery cell cover plate, wherein the battery cell cover plate comprises:

[0006] The cover plate body is provided with a mounting hole;

[0007] The pole comprises a pole body and a pole bottom plate formed in a split structure, wherein the pole bottom plate is arranged on the side of the cover plate body facing the inside of the battery cell, and a step hole is opened on the pole bottom plate, and the pole body is passed through the step hole and the mounting hole, so that the pole is assembled on the cover plate body.

[0008] Preferably, the step hole comprises a first step portion and a second step portion, and the first step portion and the second step portion have different sizes in the first direction;

[0009] A positioning portion is formed on the side wall of the pole body, and the positioning portion is assembled on the second step portion.

[0010] Preferably, the step hole further comprises a third step portion arranged on a side of the second step portion away from the first step portion;

[0011] The dimension of the third step portion in the first direction is greater than the dimension of the second step portion in the first direction;

[0012] The pole body is connected to the pole bottom plate by welding to form a welding portion between the positioning portion and the second step portion.

[0013] Preferably, the size of the first step portion in the first direction is smaller than the size of the second step portion in the first direction and smaller than the size of the third step portion in the first direction;

[0014] Alternatively, a size of the second step portion in the first direction is smaller than a size of the third step portion in the first direction, and smaller than a size of the first step portion in the first direction.

[0015] Preferably, a distance L1 between the first step portion and the second step portion in the first direction is ≥0.8 mm; and / or a dimension H1 of the first step portion in the second direction is ≥0.5 mm.

[0016] Preferably, in the first direction, a distance L3 between the second step portion and the third step portion is ≥ 0.35 mm; and / or a dimension H3 of the third step portion in the second direction is ≥ 0.05 mm.

[0017] Preferably, the pole bottom plate is formed as a plate-like structure arranged parallel to the cover plate body;

[0018] The battery cover plate also includes:

[0019] The sealing member is formed into an annular structure and is sleeved on the circumferential side wall of the pole body. The sealing member is sandwiched between the pole bottom plate and the cover plate body, and a portion of the sealing member extends into the mounting hole.

[0020] Preferably, the cell cover plate further comprises:

[0021] A first insulating member is arranged on a side of the cover plate body facing the outside of the battery cell, and a portion of the first insulating member extends into the mounting hole;

[0022] The second insulating member is arranged on a side of the cover plate body facing the inside of the battery cell, and the second insulating member is sandwiched between the pole bottom plate and the cover plate body.

[0023] Preferably, the cell cover plate further comprises:

[0024] A rivet is arranged on a side of the cover plate body facing the outside of the battery cell, and one end of the pole body away from the pole bottom plate is riveted to the rivet.

[0025] A second aspect of the utility model provides a battery cell, comprising the battery cell cover plate described in any of the above technical solutions.

[0026] Compared with the prior art, the beneficial effects of the utility model are:

[0027] The battery cover of the utility model arranges the pole into a split structure including a pole body and a pole bottom plate. The pole body passes through the mounting holes on the pole bottom plate and the cover body, ensuring that the pole body will not affect the assembly accuracy of the pole bottom plate during the riveting process, thereby ensuring the flatness of the pole bottom plate and avoiding the pole bottom plate from warping after riveting, thereby ensuring the sealing of the battery cover and further improving the yield rate of battery production.

[0028] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 A schematic diagram of the structure of a battery cover provided by an embodiment of the utility model;

[0031] Figure 2 A schematic diagram of the structure of the battery cover provided by an embodiment of the utility model from another perspective;

[0032] Figure 3 along Figure 2 The cross-section taken at AA in the middle;

[0033] Figure 4 for Figure 3 A schematic diagram of the structure enlarged at B in the middle;

[0034] Figure 5 for Figure 3 Enlarged schematic diagram of the structure at C in the middle.

[0035] Icons: 10-cover body; 11-mounting hole; 20-pole; 21-pole body; 211-positioning part; 22-pole bottom plate; 221-step hole; 2211-first step part; 2212-second step part; 2213-third step part; 30-sealing member; 41-first insulating member; 42-second insulating member; 50-rivet member; D1-first direction; D2-second direction. DETAILED DESCRIPTION

[0036] The following specific embodiments are provided to help the reader obtain a comprehensive understanding of the methods, devices and / or systems described herein. However, after understanding the disclosure of the present application, various changes, modifications and equivalents of the methods, devices and / or systems described herein will be apparent. For example, the order of operations described herein is merely an example, and is not limited to the order set forth herein, but in addition to the operations that must occur in a particular order, changes that will be apparent after understanding the disclosure of the present application may be made. In addition, in order to improve clarity and brevity, descriptions of features known in the art may be omitted.

[0037] The features described herein may be implemented in different forms and should not be interpreted as being limited to the examples described herein. Rather, the examples described herein have been provided only to illustrate some of the many possible ways of implementing the methods, devices and / or systems described herein that will be apparent after understanding the disclosure of the present application.

[0038] Throughout the specification, when an element (such as a layer, a region, or a substrate) is described as being “on”, “connected to”, “bound to”, “over”, or “covering” another element, it may be directly “on”, “connected to”, “bound to”, “over”, or “covering” another element, or one or more other elements may be present between them. In contrast, when an element is described as being “directly on”, “directly connected to”, “directly bound to”, “directly over”, or “directly covering” another element, there may be no other elements present between them.

[0039] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.

[0040] Although terms such as "first," "second," and "third" may be used herein to describe various members, components, regions, layers, or portions, these members, components, regions, layers, or portions are not limited by these terms. Rather, these terms are only used to distinguish one member, component, region, layer, or portion from another member, component, region, layer, or portion. Therefore, without departing from the teachings of the examples described herein, the first member, component, region, layer, or portion referred to may also be referred to as the second member, component, region, layer, or portion.

[0041] For ease of description, spatial relational terms such as "above", "upper", "below", and "lower" may be used herein to describe the relationship of one element to another element as shown in the accompanying drawings. Such spatial relational terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. For example, if the device in the accompanying drawings is turned over, an element described as being "above" or "upper" relative to another element will subsequently be "below" or "lower" relative to the other element. Therefore, the term "above" includes both "above" and "below" orientations depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relational terms used herein will be interpreted accordingly.

[0042] The terms used herein are only used to describe various examples and are not used to limit the present disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms "include", "comprise" and "have" list the stated features, quantities, operations, components, elements and / or their combinations that exist, but do not exclude the existence or addition of one or more other features, quantities, operations, components, elements and / or their combinations.

[0043] Variations in the shapes shown in the drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings but include variations in shapes that occur during manufacturing.

[0044] The features of the examples described herein may be combined in various ways that will be apparent after understanding the disclosure of the present application. In addition, although the examples described herein have various configurations, other configurations are possible as will be apparent after understanding the disclosure of the present application.

[0045] According to a first aspect of the utility model, a battery cell cover is provided, which specifically includes a cover body 10 and a pole 20 .

[0046] Hereinafter, the specific structure of the cell cover plate according to this embodiment will be described.

[0047] In this embodiment, if Figures 1 to 3 As shown, the cover body 10 is formed as a sheet structure. Specifically, the cover body 10 can form a rectangular or circular structure. A mounting hole 11 is opened on the cover body 10. The mounting hole 11 is formed as a through hole structure that penetrates the cover body 10. The pole 20 is installed in the mounting hole 11 and both ends of the pole 20 in the axial direction extend out of the mounting hole 11.

[0048] Specifically, in this embodiment, Figure 1 , Figure 4 and Figure 5 As shown, the pole 20 includes a pole body 21 and a pole bottom plate 22 formed as a split structure, so that the pole 20 is divided into two parts in the axial direction, and the pole bottom plate 22 is arranged on the side of the cover body 10 facing the inside of the battery cell, and a step hole 221 is opened on the pole bottom plate 22, and the pole body 21 is penetrated by the step hole 221 and the mounting hole 11, so that the pole 20 is assembled on the cover body 10, and the step hole 221 enables the pole body 21 and the pole bottom plate 22 to form axial positioning, ensuring that the pole body 21 will not affect the assembly accuracy of the pole bottom plate 22 during the riveting process, thereby ensuring the flatness of the pole bottom plate 22, and avoiding the pole bottom plate 22 from warping relative to the cover body 10 after riveting, thereby ensuring the sealing of the battery cover.

[0049] Furthermore, in this embodiment, if Figure 4 and Figure 5 As shown, the structure of the step hole 221 is that the step hole 221 includes a first step portion 2211 and a second step portion 2212, the first step portion 2211 and the second step portion 2212 are arranged along the axial direction of the step hole 221, and the first step portion 2211 and the second step portion 2212 have different sizes in the first direction D1; the step hole 221 can be a circular or square structure, and when the step hole 221 is a circular hole, the size of the first step portion 2211 and the second step portion 2212 in the first direction D1 is the radial size of the circular step hole 221. The side wall of the pole body 21 is formed with a positioning portion 211, and the positioning portion 211 is assembled on the second step portion 2212, so that the pole body 21 and the pole bottom plate 22 are positioned in the axial direction, so that the pole body 21 can be coaxially arranged with the step hole 221, and it is ensured that the pole bottom plate 22 is not affected by the riveting of the pole body 21.

[0050] In this embodiment, if Figure 4 and Figure 5 As shown, the first step portion 2211 and the second step portion 2212 are arranged adjacent to each other in the axial direction of the step hole 221. In the first embodiment, as shown in FIG. Figure 4 As shown, the positioning portion 211 is formed as a boss structure protruding outward from the side wall of the pole body 21, so that the positioning portion 211 assembled on the second step portion 2212 is clamped on the boss between the first step portion 2211 and the second step portion 2212. Figure 5 As shown, the positioning portion 211 forms a groove structure that is recessed inwardly from the side wall of the pole body 21, so that the side wall of the pole body 21 except the positioning portion 211 protrudes in the first direction D1 relative to the positioning portion 211, so that the positioning portion 211 assembled on the second step portion 2212 is clamped on the boss between the first step portion 2211 and the second step portion 2212.

[0051] In this embodiment, one or more poles 20 are arranged on the cell cover plate. When the number of poles 20 is one, the positioning portion 211 can be formed as a boss structure or a groove structure as described above; when the number of poles 20 is multiple, the positioning portion 211 of part of the pole body 21 can be formed as a boss structure as described above and the positioning portion 211 of the remaining pole body 21 can be formed as a groove structure as described above, or the positioning portion 211 of all the pole body 21 can be formed as Figure 4 The boss structure shown, or the positioning portion 211 of the entire pole body 21 is formed as Figure 5 The groove structure is shown.

[0052] In this embodiment, the size of the positioning portion 211 in the first direction D1 is the same as the size of the second step portion 2212 in the first direction D1; the size of the side wall of the pole body 21 assembled on the first step portion 2211 in the first direction D1 is the same as the size of the first step portion 2211 in the first direction D1, so as to meet the mutual cooperation between the pole body 21 and the pole base plate 22.

[0053] Furthermore, if Figure 4 and Figure 5 As shown, the step hole 221 also includes a third step portion 2213 arranged on a side of the second step portion 2212 away from the first step portion 2211, that is, in the axial direction of the step hole 221, the second step portion 2212 is arranged between the first step portion 2211 and the third step portion 2213; in this embodiment, the size of the third step portion 2213 in the first direction D1 is greater than the size of the second step portion 2212 in the first direction D1, so that a boss structure is formed between the second step portion 2212 and the third step portion 2213; the pole body 21 is welded to the pole bottom plate 22 to form a welding portion between the positioning portion 211 and the second step portion 2212, and the setting of the third step portion 2213 can form an avoidance space for the welding portion.

[0054] In a preferred embodiment, Figure 4 and Figure 5 As shown, the distance L3 between the second step portion 2212 and the third step portion 2213 in the first direction D1 is ≥0.35mm; preferably, the dimension H3 of the third step portion 2213 in the second direction D2 is ≥0.05mm, thereby ensuring that the third step portion 2213 can effectively avoid the formation of the welding portion.

[0055] In a first embodiment, if Figure 4 As shown, the size of the first step portion 2211 in the first direction D1 is smaller than the size of the second step portion 2212 in the first direction D1 and smaller than the size of the third step portion 2213 in the first direction D1, so that the step hole 221 is formed in the first direction D1. Figure 4 The stepped structure with decreasing apertures in viewing angle enables the positioning portion 211 on the pole body 21 to press the pole bottom plate 22 toward the seal 30 described below, ensuring that the pole bottom plate 22 can effectively compress and support the seal 30 .

[0056] In a second embodiment, if Figure 5 As shown, the size of the second step portion 2212 in the first direction D1 is smaller than the size of the third step portion 2213 in the first direction D1, which is smaller than the size of the first step portion 2211 in the first direction D1. In this way, the size of the second step portion 2212 in the first direction D1 is minimized, so that a preset distance is set between the welding portion and the sealing member 30, so that the heat generated during the formation of the welding portion will not affect the sealing member 30, thereby improving the sealing performance of the battery cover.

[0057] Specifically, in this embodiment, Figure 4 and Figure 5 As shown, the distance L1 between the first step portion 2211 and the second step portion 2212 in the first direction D1 is ≥0.8 mm; preferably, the dimension H1 of the first step portion 2211 in the second direction D2 is ≥0.5 mm, thereby ensuring that the welding portion forms a certain distance with the seal 30 in both the first direction D1 and the second direction D2, thereby ensuring the sealing performance of the seal 30.

[0058] It should be noted that, in the present embodiment, the first direction D1 is perpendicular to the second direction D2, and the second direction D2 is the thickness direction of the cover body 10, that is, the axial direction of the pole body 21 or the step hole 221; when the cover body 10 is formed into a rectangular sheet structure, the first direction D1 is the length direction of the cover body 10.

[0059] In this embodiment, if Figures 1 to 5 As shown, the pole bottom plate 22 is formed into a plate-like structure arranged parallel to the cover body 10, for example, the pole bottom plate 22 can be a rectangular sheet structure; the battery cover also includes a seal 30, which is formed into an annular structure and is sleeved on the circumferential side wall of the pole body 21, so that the seal 30 is sandwiched between the mounting hole 11 and the pole body 21 in the first direction D1, and the seal 30 is sandwiched between the pole bottom plate 22 and the cover body 10 in the second direction D2, and part of the seal 30 extends into the mounting hole 11, so that the pole bottom plate 22 plays an effective compression and support role for the seal 30, thereby achieving effective sealing and avoiding leakage of the electrolyte inside the battery. In this embodiment, the seal 30 can be a sealing ring, and the shape of the seal 30 is the same as the outer wall shape of the pole body 21, so as to ensure effective sealing.

[0060] Furthermore, in this embodiment, if Figures 1 to 5 As shown, the cell cover also includes a first insulating member 41 and a second insulating member 42. The first insulating member 41 and the second insulating member 42 are both made of insulating materials, such as plastic materials. Specifically, the first insulating member 41 is arranged on the side of the cover body 10 facing the outside of the cell, the first insulating member 41 is formed into an annular structure, and part of the first insulating member 41 extends into the mounting hole 11, so that the cover body 10 is separated from the pole body 21, thereby playing a role of insulation protection; the second insulating member 42 is arranged on the side of the cover body 10 facing the inside of the cell, the second insulating member 42 is formed into a strip structure adapted to the cover body 10 and is clamped between the pole bottom plate 22 and the cover body 10, so that the cover body 10 is separated from the pole bottom plate 22, thereby achieving insulation protection.

[0061] In this embodiment, if Figures 1 to 5 As shown, the battery cover also includes a rivet 50, which is formed into a block structure with an opening. The rivet 50 is arranged on the side of the cover body 10 facing the outside of the battery cell, so that the end of the pole body 21 away from the pole bottom plate 22 is riveted to the rivet 50. Specifically, the end of the pole body 21 away from the pole bottom plate 22 extends into the opening of the rivet 50, and the size of the end of the pole body 21 in the first direction D1 is increased through the riveting process to limit one end of the pole body 21 in the axial direction, and the positioning portion 211 as described above is used to limit the two ends of the pole body 21 in the axial direction, thereby realizing the assembly of the battery cover.

[0062] According to a battery cover provided by the utility model, the pole is arranged as a split structure including a pole body and a pole bottom plate, and the pole body passes through the mounting holes on the pole bottom plate and the cover body, so as to ensure that the pole body will not affect the assembly accuracy of the pole bottom plate during the riveting process, thereby ensuring the flatness of the pole bottom plate, avoiding the pole bottom plate from warping after riveting, thereby ensuring the sealing of the battery cover.

[0063] According to a battery cell provided by the utility model, including the battery cell cover as described above, the pole bottom plate will not warp up after riveting, so as to ensure that the battery cell cover plate has reliable sealing performance, and can also ensure that the pole bottom plate and other components inside the battery cell are reliably assembled, thereby improving the yield rate of battery cell production.

[0064] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solutions of the present application, rather than to limit them. The protection scope of the present application is not limited thereto. Although the present application is described in detail with reference to the above-described embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-described embodiments within the technical scope disclosed in the present application, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A battery cell cover, characterized in that: The battery cover plate comprises: The cover plate body is provided with a mounting hole; The pole comprises a pole body and a pole bottom plate formed in a split structure, wherein the pole bottom plate is arranged on the side of the cover plate body facing the inside of the battery cell, and a step hole is opened on the pole bottom plate, and the pole body is passed through the step hole and the mounting hole, so that the pole is assembled on the cover plate body.

2. The cell cover plate according to claim 1, characterized in that: The step hole comprises a first step portion and a second step portion, and the first step portion and the second step portion have different sizes in the first direction; A positioning portion is formed on the side wall of the pole body, and the positioning portion is assembled on the second step portion.

3. The cell cover plate according to claim 2, characterized in that: The step hole further includes a third step portion disposed on a side of the second step portion away from the first step portion; The dimension of the third step portion in the first direction is greater than the dimension of the second step portion in the first direction; The pole body is connected to the pole bottom plate by welding to form a welding portion between the positioning portion and the second step portion.

4. The cell cover plate according to claim 3, characterized in that: The dimension of the first step portion in the first direction is smaller than the dimension of the second step portion in the first direction and smaller than the dimension of the third step portion in the first direction; Alternatively, a size of the second step portion in the first direction is smaller than a size of the third step portion in the first direction, and smaller than a size of the first step portion in the first direction.

5. The cell cover plate according to claim 2, characterized in that: A distance L1 between the first step portion and the second step portion in the first direction is ≥ 0.8 mm; and / or a dimension H1 of the first step portion in the second direction is ≥ 0.5 mm.

6. The cell cover plate according to claim 3, characterized in that: A distance L3 between the second step portion and the third step portion in the first direction is ≥0.35 mm; and / or a dimension H3 of the third step portion in the second direction is ≥0.05 mm.

7. The cell cover plate according to claim 1, characterized in that: The pole bottom plate is formed into a plate-like structure arranged parallel to the cover plate body; The battery cover plate also includes: The sealing member is formed into an annular structure and is sleeved on the circumferential side wall of the pole body. The sealing member is sandwiched between the pole bottom plate and the cover plate body, and a portion of the sealing member extends into the mounting hole.

8. The cell cover plate according to claim 1, characterized in that: The battery cover plate also includes: A first insulating member is arranged on a side of the cover plate body facing the outside of the battery cell, and a portion of the first insulating member extends into the mounting hole; The second insulating member is arranged on a side of the cover plate body facing the inside of the battery cell, and the second insulating member is sandwiched between the pole bottom plate and the cover plate body.

9. The cell cover plate according to claim 1, characterized in that: The battery cover plate also includes: A rivet is arranged on a side of the cover plate body facing the outside of the battery cell, and one end of the pole body away from the pole bottom plate is riveted to the rivet.

10. A battery cell, characterized in that: Comprising the battery cell cover plate as described in any one of claims 1 to 9.

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