Winding connection type cover plate, battery shell, battery and battery pack

Abstract

The utility model belongs to the technical field of batteries, and discloses a winding connection type cover plate, a battery shell, a battery and a battery pack. The winding connection type cover plate comprises a cover plate body, a first plastic part, a second plastic part and a winding part. The first plastic part and the second plastic part are arranged on the two sides of the cover plate body respectively, a tab shaping structure is arranged on the side, deviating from the cover plate body, of the second plastic part, and a tab can be folded in the tab shaping structure and turned to the side, deviating from the cover plate body, of the first plastic part through the second plastic part and the cover plate body. The winding piece can penetrate through and wind the whole of the first plastic piece and the cover plate body, or the whole of the cover plate body and the second plastic piece, or the whole of the first plastic piece, the cover plate body and the second plastic piece in a loopback mode. The winding connection type cover plate can normalize the shape of the tab, enlarge the internal space of the battery shell, realize the simplification of the structure and improve the assembly reliability.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a winding connection type cover plate, a battery shell, a battery and a battery pack. Background Art

[0002] The first plastic part of a traditional battery cover is arranged on the outside of the cover body, the second plastic part is thicker and is arranged on the side of the cover body away from the first plastic part, and the pole and the tab are both arranged inside the battery shell.

[0003] The above arrangement is not conducive to the utilization of the internal space of the battery housing, and the shape of the tabs after folding is poor, which can easily cause short circuit problems. In addition, in the above arrangement, the first plastic part and the cover body need to be connected by riveting blocks, which is a complex connection method and lacks reliability.

[0004] Therefore, there is an urgent need for a wrap-around connection cover, battery shell, battery and battery pack to solve the above problems. Utility Model Content

[0005] According to one aspect of the present invention, the purpose is to provide a wrap-around cover plate, which can regularize the shape of the tabs, expand the internal space of the battery shell, simplify the structure, and improve assembly reliability.

[0006] To achieve this purpose, the present invention adopts the following technical solutions:

[0007] Wrap-around cover, including:

[0008] Cover plate body;

[0009] a first plastic part and a second plastic part, wherein the first plastic part and the second plastic part are respectively arranged on both sides of the cover plate body; a tab shaping structure is provided on a side of the second plastic part away from the cover plate body; the tab can be folded into the tab shaping structure and folded through the second plastic part and the cover plate body to a side of the first plastic part away from the cover plate body;

[0010] The wrapping piece can penetrate and wrap around the first plastic piece and the cover body as a whole, or the cover body and the second plastic piece as a whole, or the first plastic piece, the cover body and the second plastic piece as a whole in a loop manner.

[0011] As a preferred solution of the wrapped connection type cover plate provided by the present invention, the cover plate body is provided with a cover plate tab opening, the first plastic part is provided with a first plastic part tab opening, the second plastic part is provided with a second plastic part tab opening, the cover plate tab opening, the first plastic part tab opening and the second plastic part tab opening are arranged correspondingly, and the tab can be folded over the first plastic part through the second plastic part tab opening, the cover plate tab opening and the first plastic part tab opening.

[0012] As a preferred solution of the wrap-around connection type cover provided by the present invention, the cover body is provided with a receiving groove, the first plastic part is received in the receiving groove, and the cover tab opening is provided at the bottom of the receiving groove.

[0013] As a preferred solution of the wrap-around connection cover provided by the present invention, an embedding groove is provided on the side of the first plastic part away from the cover body, a part of the wrap-around part is located in the embedding groove, and the upper end surface of the wrap-around part is not higher than the upper end surface of the first plastic part.

[0014] As a preferred solution of the wrapping connection type cover plate provided by the present invention, the number of loop windings N of the wrapping member is ≥1.

[0015] As a preferred solution of the wrapping connection type cover provided by the present invention, the thickness of the wrapping member is 25 μm-150 μm.

[0016] As a preferred solution of the wrapping connection type cover provided by the present invention, the wrapping member is PEI tape, PI tape, PP tape or PE tape.

[0017] According to another aspect of the present invention, the object is to provide a battery shell, which includes a shell and a winding-connected cover plate as described in any one of the above schemes, and the winding-connected cover plate is arranged at the opening of the shell to form a battery cell accommodating space.

[0018] According to another aspect of the present invention, the purpose is to provide a battery, which includes a battery cell and a battery shell as described in the above scheme, the battery cell is arranged in the battery shell, and the tabs of the battery cell can be retracted to the tab shaping structure and folded to the side of the first plastic part away from the cover body through the second plastic part and the cover body.

[0019] According to another aspect of the present invention, an object is to provide a battery pack, which includes several batteries as described in the above solution.

[0020] Beneficial effects of the utility model:

[0021] The wrapping connection type cover provided by the present invention includes a cover body, a first plastic part, a second plastic part, and a wrapping part. The first plastic part and the second plastic part are respectively arranged on both sides of the cover body, and a tab shaping structure is provided on the side of the second plastic part facing away from the cover body. The tab can be folded into the tab shaping structure and folded through the second plastic part and the cover body to the side of the first plastic part facing away from the cover body. In other words, the tab shaping structure can regularize the shape of the tab, avoid the short circuit problem caused by the poor shape of the tab after folding, and a part of the tab can be arranged outside the battery shell, thereby expanding the internal space of the battery shell. The wrapping part can pass through and wrap around the entire first plastic part and the cover body, or the entire cover body and the second plastic part, or the entire first plastic part, the cover body, and the second plastic part in a loop. That is to say, through the wrapping part, a reliable connection between the cover body, the first plastic part and the second plastic part can be achieved, or a reliable connection between the cover body and the first plastic part can be achieved, or a reliable connection between the cover body and the second plastic part can be achieved, thereby improving the reliability of the connection assembly; and the connection is carried out in a winding manner, which can simplify the structure of the wrapped connection cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the structure of the winding connection cover provided by the embodiment of the utility model. Figure 1 ;

[0023] Figure 2 This is a schematic diagram of the structure of the winding connection cover provided by the embodiment of the utility model. Figure 2 ;

[0024] Figure 3 This is a schematic diagram of the decomposition of the winding connection cover provided by the embodiment of the utility model Figure 1 ;

[0025] Figure 4 This is a schematic diagram of the decomposition of the winding connection cover provided by the embodiment of the utility model Figure 2 ;

[0026] Figure 5 This is a top view of a wrap-around connection type cover plate provided by an embodiment of the present utility model;

[0027] Figure 6 yes Figure 5 Cross-sectional view along the AA axis;

[0028] Figure 7 yes Figure 6 A magnified view of the structure marked B.

[0029] In the picture:

[0030] 100, cover plate body; 110, cover plate tab opening; 120, receiving groove; 130, liquid injection hole; 140, explosion-proof valve;

[0031] 200, first plastic part; 210, embedding groove; 220, tab opening of first plastic part;

[0032] 300, second plastic part; 310, tab shaping structure; 330, tab opening of second plastic part;

[0033] 400. Wrapping parts. DETAILED DESCRIPTION

[0034] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0035] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0036] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0037] In the description of this embodiment, terms such as "upper," "lower," "right," and "left" are used to refer to positions or locations based on the positions or locations shown in the accompanying drawings. These terms are intended solely to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0038] This embodiment provides a wrap-around cover plate, a battery case, a battery, and a battery pack. The battery case includes a housing and the wrap-around cover plate provided in this embodiment. The wrap-around cover plate is positioned at an opening in the housing, and the two together form a cell-accommodating space. The battery includes a cell and the aforementioned battery case, with the cell being positioned within the cell-accommodating space within the battery case. The battery pack provided in this embodiment includes several batteries provided in this embodiment.

[0039] Figure 1 The structure diagram of the wrap-around connection cover provided by the embodiment of the utility model is shown as follows Figure 1 ; Figure 2 The structure diagram of the wrap-around connection cover provided by the embodiment of the utility model is shown as follows Figure 2 ; Figure 3 The exploded diagram of the wrap-around cover provided by the embodiment of the present invention is shown Figure 1 ; Figure 4 The exploded diagram of the wrap-around cover provided by the embodiment of the present invention is shown Figure 2 ; Figure 5 FIG2 shows a top view of a wrap-around connection cover provided by an embodiment of the present invention. Figure 1-Figure 5 The wrapping connection type cover provided in this embodiment includes a cover body 100 , a first plastic part 200 , a second plastic part 300 and a wrapping part 400 .

[0040] Specifically, the first plastic part 200 and the second plastic part 300 are respectively disposed on either side of the cover body 100. A tab shaping structure 310 is provided on the side of the second plastic part 300 facing away from the cover body 100. The tabs of the battery cell can be fitted and folded together within the tab shaping structure 310 and then folded through the second plastic part 300 and the cover body 100 to the side of the first plastic part 200 facing away from the cover body 100. The tab shaping structure 310 regularizes the tab shape, preventing short circuits caused by poorly shaped tabs after folding. Furthermore, a portion of the tab can be positioned outside the battery case, thereby expanding the internal space of the battery case.

[0041] Specifically, the tab shaping structure 310 may be one or more, and its number is selected according to the arrangement of the tabs and the actual needs of the battery. In this embodiment, the tab shaping structure 310 is multiple, and the multiple tab shaping structures 310 are arranged in two groups along the length direction of the second plastic part 300, and multiple tab shaping structures 310 in the same group are arranged side by side along the width direction of the second plastic part 300, such as Figure 2 、 Figure 4 and Figure 6 shown.

[0042] Continue to refer to Figure 1-Figure 5The cover plate body 100 defines a cover plate tab opening 110, the first plastic part 200 defines a first plastic part tab opening 220, and the second plastic part 300 defines a second plastic part tab opening 330. The cover plate tab opening 110, the first plastic part tab opening 220, and the second plastic part tab opening 330 are correspondingly arranged. The tab can pass through the second plastic part tab opening 330, the cover plate tab opening 110, and the first plastic part tab opening 220, fold over the top of the first plastic part 200, and connect to the positive or negative electrode of the battery. If only a positive electrode or only a negative electrode is provided on the cover plate body 100, the number of cover plate tab openings 110 (Y) ≥ 1. If the cover plate body 100 has a positive electrode on one side and a negative electrode on the other side in its longitudinal direction, the number of cover plate tab openings 110 (Y) ≥ 1 on both the positive and negative sides of the cover plate body 100. That is, the tab corresponding to the positive or negative electrode can extend out of the battery case through a set of corresponding second plastic tab openings 330, cover tab openings 110, and first plastic tab openings 220, or can extend out of the battery case through multiple sets of corresponding second plastic tab openings 330, cover tab openings 110, and first plastic tab openings 220. In this embodiment, the cover body 100 is provided with two cover tab openings 110, corresponding to the positive or negative electrode on the cover body 100. Correspondingly, the first plastic part 200 is provided with two first plastic tab openings 220, one-to-one corresponding to the cover tab openings 110. The cover tab openings 110 are opened along the length of the cover body 100, and the two cover tab openings 110 are spaced apart along the width of the cover body 100.

[0043] More specifically, a receiving groove 120 is defined on the side of the cover body 100 facing away from the second plastic component 300. The first plastic component 200 can be received in the receiving groove 120, and the cover tab opening 110 is formed at the bottom of the receiving groove 120. The distance between the upper end surface of the first plastic component 200 and the notch of the receiving groove 120, that is, the upper end surface of the cover body 100, is 0-0.5 mm. If this distance is too small, it will not be conducive to improving space utilization. If this distance is too large, it will reduce the structural strength of the cover body 100.

[0044] More specifically, in this embodiment, the cover body 100 may or may not have a liquid injection hole 130. When the liquid injection hole 130 is provided, the liquid injection hole 130 may be located near the positive electrode side of the cover body 100, near the negative electrode side of the cover body 100, or between the positive and negative electrodes on the cover body 100.

[0045] More specifically, in this embodiment, the cover body 100 may further be provided with an explosion-proof valve 140. The explosion-proof valve 140 is specifically provided between the positive and negative electrodes on the cover body 100. The notch on the explosion-proof valve 140 may be provided on the side of the cover body 100 facing the battery cell accommodation space, or on the side of the cover body 100 facing away from the battery cell accommodation space.

[0046] Reference Figure 1 and Figure 3 The first plastic part 200 is provided with a flange along its circumference, which can increase the contact area between the first plastic part 200 and the cover body 100. It should be noted that in this embodiment, the width of the flange is in the range of 0-10 mm. If the width of the flange is too large, it will lead to an increase in the weight of the first plastic part 200, the amount of material used, and the manufacturing cost.

[0047] Reference Figure 2 The wrapping piece 400 can sequentially pass through the first plastic part tab opening 220, the cover plate tab opening 110 and the second plastic part tab opening 330 corresponding to one side in the width direction of the cover body 100, and extend into the battery shell. Then, after bypassing the second plastic part 300, it can sequentially extend out of the battery shell from the second plastic part tab opening 330, the cover plate tab opening 110 and the first plastic part tab opening 220 corresponding to the other side in the width direction of the cover body 100, forming a loop structure.

[0048] It should be noted that, in this embodiment, the first plastic part 200 and the second plastic part 300 may both adopt a split structure or an integrated structure, and this embodiment does not impose any limitation thereto.

[0049] Figure 7 Show Figure 6 A partial enlarged view of the structure marked as B. Figure 1-Figure 7 The wrapping member 400 can pass through and loop around the entire first plastic part 200 and the cover body 100, or the entire cover body 100 and the second plastic part 300, or the entire first plastic part 200, the cover body 100, and the second plastic part 300. In other words, the wrapping member 400 can achieve a reliable connection between the cover body 100, the first plastic part 200, and the second plastic part 300, or between the cover body 100 and the first plastic part 200, or between the cover body 100 and the second plastic part 300. This simple structure can improve the reliability of the connection assembly, thereby enhancing the structural stability of the entire wrap-around cover.

[0050] When the wrapping piece 400 is used to connect the first plastic part 200 and the cover body 100, the wrapping piece 400 can bypass the side of the first plastic part 200 away from the cover body 100, then pass through the first plastic part tab opening 220 and the cover tab opening 110 on one side, bypass the cover body 100, and then pass through the cover tab opening 110 and the first plastic part tab opening 220 on the other side and extend to the side of the first plastic part 200 away from the cover body 100, forming a loop structure.

[0051] When the wrapping piece 400 is used to connect the cover body 100 and the second plastic part 300, the wrapping piece 400 can bypass the side of the cover body 100 away from the second plastic part 300, then pass through the cover tab opening 110 and the second plastic part tab opening 330 on one side, bypass the second plastic part 300 and then pass through the second plastic part tab opening 330 and the cover tab opening 110 on the other side and then extend to the side of the cover body 100 away from the second plastic part 300, forming a loop structure.

[0052] When the wrapping piece 400 is used to connect the first plastic part 200, the cover plate body 100 and the second plastic part 300, the wrapping piece 400 can bypass the side of the first plastic part 200 away from the cover plate body 100, and then pass through the first plastic part tab opening 220, the cover plate tab opening 110 and the second plastic part tab opening 330 on one side, bypass the second plastic part 300 and then pass through the second plastic part tab opening 330, the cover plate tab opening 110 and the first plastic part tab opening 220 on the other side and then extend to the side of the first plastic part 200 away from the cover plate body 100, forming a loop structure.

[0053] More specifically, in this embodiment, the wrapping member 400 is used to connect the first plastic part 200, the cover body 100, and the second plastic part 300. A recess 210 is defined on the side of the first plastic part 200 facing away from the cover body 100. A portion of the wrapping member 400 is positioned within the recess 210, ensuring that the upper end surface of the wrapping member 400 is no higher than the upper end surface of the first plastic part 200.

[0054] It should be noted that, in this embodiment, the position where the wrapping member 400 bypasses the second plastic part 300 coincides with the position where the tab shaping structure 310 is provided, that is, the wrapping member 400 needs to bypass the tab shaping structure 310 .

[0055] Optionally, there may be one or more wrapping members 400. When multiple wrapping members 400 are provided, the wrapping members 400 are spaced apart along the length of the cover body 100 and are used to wrap and connect the first plastic part 200, the cover body 100, and the second plastic part 300, further improving assembly reliability and uniformity of force applied to each component.

[0056] Alternatively, the wrapping member 400 is a PEI (Polyetherimide) tape, a PI (Polyimide) tape, a PP (Polypropylene) tape or a PE (Polyethylene) tape.

[0057] Optionally, the wrapping member 400 has a thickness of 25 μm-150 μm to ensure the wrapping strength of the wrapping member 400 .

[0058] Optionally, the number of loop windings N of the wrapping member 400 is greater than or equal to 1, so as to improve the winding reliability of the wrapping member 400 .

[0059] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. The wrap-around cover is characterized by: include: Cover plate body (100); A first plastic part (200) and a second plastic part (300), wherein the first plastic part (200) and the second plastic part (300) are respectively arranged on both sides of the cover plate body (100); a tab shaping structure (310) is arranged on a side of the second plastic part (300) away from the cover plate body (100); the tab can be folded into the tab shaping structure (310) and folded to a side of the first plastic part (200) away from the cover plate body (100) through the second plastic part (300) and the cover plate body (100); A wrapping piece (400) is capable of penetrating and wrapping around the first plastic piece (200) and the cover plate body (100) as a whole, or the cover plate body (100) and the second plastic piece (300) as a whole, or the first plastic piece (200), the cover plate body (100) and the second plastic piece (300) as a whole in a loop manner.

2. The wrap-around cover plate according to claim 1, characterized in that: The cover plate body (100) is provided with a cover plate tab opening (110), the first plastic part (200) is provided with a first plastic part tab opening (220), and the second plastic part (300) is provided with a second plastic part tab opening (330). The cover plate tab opening (110), the first plastic part tab opening (220), and the second plastic part tab opening (330) are correspondingly arranged. The tab can pass through the second plastic part tab opening (330), the cover plate tab opening (110), and the first plastic part tab opening (220) and be folded over the first plastic part (200).

3. The wrap-around cover plate according to claim 2, characterized in that: The cover plate body (100) is provided with a receiving groove (120), the first plastic part (200) is received in the receiving groove (120), and the cover plate tab opening (110) is provided at the bottom of the receiving groove (120).

4. The wrap-around cover plate according to claim 1, characterized in that: An embedding groove (210) is provided on a side of the first plastic part (200) facing away from the cover plate body (100), a portion of the wrapping part (400) is located in the embedding groove (210), and the upper end surface of the wrapping part (400) is not higher than the upper end surface of the first plastic part (200).

5. The wrap-around cover plate according to claim 1, characterized in that: The number of loop windings of the winding member (400) is N≥1.

6. The wrap-around cover according to any one of claims 1 to 5, characterized in that: The wrapping member (400) has a thickness of 25 μm-150 μm.

7. The wrap-around cover according to any one of claims 1 to 5, characterized in that: The wrapping member (400) is a PEI tape, a PI tape, a PP tape or a PE tape.

8. A battery case, characterized in that It comprises a shell and a wrapping-connected cover plate as described in any one of claims 1 to 7, wherein the wrapping-connected cover plate is arranged at the opening of the shell to form a battery cell accommodating space.

9. A battery, characterized in that The battery cell comprises a battery shell as claimed in claim 8, wherein the battery cell is arranged in the battery shell, and the tab of the battery cell can be retracted to the tab shaping structure (310) and folded to the side of the first plastic part (200) away from the cover body (100) through the second plastic part (300) and the cover body (100).

10. A battery pack, characterized in that: Comprising a plurality of batteries as claimed in claim 9.

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