Pole group protective film, battery cell and battery cell module

Abstract

The utility model provides a pole group protective film, a battery cell and a battery cell module, and relates to the field of battery cell structures. The main body comprises an anti-collision part which is positioned in the center of the main body and is provided with a plurality of anti-collision bubbles; the edge folding parts are located at the two ends of the anti-collision part in the width direction, and the main body is correspondingly connected with a pole group through the edge folding parts; the hot melting part is used for being in hot melting connection with the battery cell; the hot melting parts are located at the two ends of the anti-collision part in the length direction. Therefore, the main body is correspondingly and stably coated on the outer side part of the pole group through the edge folding part, the anti-collision part is coated on the side part of the pole group and then is connected with the lower plastic of the battery cell through the hot melting part, and when the battery cell generates working conditions such as vibration and the like, a plurality of anti-collision bubbles of the anti-collision part can achieve a better anti-collision buffering effect; and therefore, the conditions of short circuit and the like caused by damage of the pole group are effectively avoided.

Description

Technical Field

[0001] The present application relates to the field of battery cell structures, and in particular to an electrode group protective film, a battery cell and a battery cell module. Background Art

[0002] In existing battery cells, the electrode assembly is wrapped in a soft insulating film, typically 0.1mm thick. To account for gassing during the lithium battery's charge and discharge processes, and to ensure smooth insertion of the electrode assembly into the battery shell, the electrode assembly is typically designed to be slightly smaller than the internal dimensions of the shell. However, a 0.5-0.8mm gap remains between the electrode assembly and the shell after insertion. This can lead to varying degrees of displacement between the electrode assembly and the shell when the battery cell is subjected to various complex operating conditions, such as vibration, impact, and mechanical shock, during actual use. This can damage the electrode assembly and even cause a short circuit failure. Utility Model Content

[0003] In view of this, the purpose of this application is to provide an electrode group protective film, a battery cell and a battery cell module to solve the problem that the insulating film of the existing electrode group can only play an insulating role. When the battery cell encounters vibration and other working conditions, the electrode group is easily damaged or fails due to lack of support.

[0004] In accordance with the above objectives, a first aspect of the present invention provides an electrode group protective film, which is formed with a main body, wherein the main body includes:

[0005] an anti-collision portion, located at the center of the main body and formed with a plurality of anti-collision bubbles;

[0006] Folding portions, located at both ends of the anti-collision portion in the width direction, through which the main body is connected to the pole groups; and

[0007] The hot-melt portion is used for hot-melt connection with the battery core; the hot-melt portion is located at both ends of the anti-collision portion in the length direction.

[0008] Preferably, the thickness of the main body is 0.15 mm to 0.2 mm.

[0009] Preferably, the anti-collision portion is formed at a first end in a thickness direction of the main body.

[0010] Preferably, the plurality of anti-collision bubbles are arranged in a matrix form.

[0011] Preferably, the anti-collision bubbles are evenly distributed, and along the length direction or width direction of the anti-collision portion, the distance between any two adjacent anti-collision bubbles is 1 mm to 2 mm.

[0012] Preferably, the protrusion height of each anti-collision bubble compared to the first end in the thickness direction of the main body is 0.3 mm to 0.5 mm.

[0013] Preferably, when the main body is wrapped around the outer side of the electrode group, the two folded edge portions overlap and are bonded to each other.

[0014] Preferably, along the length direction of the main body, the extension length of each of the heat-melting portions is 8% to 12% of the length of the main body.

[0015] According to a second aspect of the present invention, a battery cell is provided, wherein the battery cell comprises the electrode group protective film as described above, and the hot melt portion is connected to the cover plate assembly of the battery cell by hot melt.

[0016] According to a third aspect of the present invention, a battery cell module is provided, wherein the battery cell module includes the battery cell described above.

[0017] According to the electrode group protective film, battery cell, and battery cell module of the present invention, the electrode group protective film is formed with a main body, a collision avoidance portion formed in the center of the main body, folded edges provided at both ends of the collision avoidance portion in the width direction, and hot-melt portions provided at both ends of the collision avoidance portion in the length direction. In this way, the main body is stably covered with the outer portion of the electrode group via the folded edges, while the collision avoidance portion covers the side of the electrode group and is then connected to the lower plastic of the battery cell via the hot-melt portion. When the battery cell vibrates or experiences other operating conditions, the multiple collision avoidance bubbles in the collision avoidance portion can effectively provide a collision avoidance and cushioning effect, thereby effectively preventing damage to the electrode group and short circuits.

[0018] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 is a schematic diagram of an electrode group protective film according to an embodiment of the present utility model;

[0021] Figure 2 It is a partial exploded view of a battery cell according to an embodiment of the present utility model.

[0022] Icon; 1-main body; 10-anti-collision part; 11-folding part; 12-hot melt part; 2-cover assembly. DETAILED DESCRIPTION

[0023] The following detailed description is provided to help the reader gain a comprehensive understanding of the methods, devices, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, devices, and / or systems described herein will be apparent upon understanding the disclosure of this application. For example, the order of operations described herein is merely illustrative and is not limited to the order set forth herein. Rather, except for operations that must occur in a particular order, changes may be made that will be apparent upon understanding the disclosure of this application. Furthermore, descriptions of features known in the art may be omitted for clarity and brevity.

[0024] The features described herein may be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein have been provided merely to illustrate some of the many possible ways to implement the methods, devices, and / or systems described herein that will be apparent upon understanding the disclosure of this application.

[0025] Throughout the specification, when an element (such as a layer, region, or substrate) is described as being “on,” “connected to,” “coupled to,” “over,” or “overlaying” another element, it may be directly “on,” “connected to,” “coupled to,” “over,” or “overlaying” 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 coupled to,” “directly over,” or “directly covering” another element, there may be no other elements intervening therebetween.

[0026] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.

[0027] 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 used only to distinguish one member, component, region, layer, or portion from another member, component, region, layer, or portion. Thus, a first member, component, region, layer, or portion in the examples described herein may also be referred to as a second member, component, region, layer, or portion without departing from the teachings of the examples.

[0028] 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 encompass different orientations of the device in use or operation in addition to the orientations 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 would subsequently be "below" or "lower" relative to the other element. Thus, the term "above" includes both the orientations "above" and "below," 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.

[0029] The terms used herein are intended only to describe various examples and are not intended to limit the present disclosure. Unless the context clearly indicates otherwise, the singular is intended to include the plural. The terms "comprise," "include," and "have" list the presence of stated features, quantities, operations, components, elements, and / or combinations thereof, but do not preclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0030] Due to manufacturing techniques and / or tolerances, variations in the shapes shown in the drawings may occur. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings but include changes in shapes that occur during manufacturing.

[0031] The features of the examples described herein can 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.

[0032] According to the first aspect of the present invention, a pole group protective film is provided, such as Figures 1 to 2 As shown, the electrode assembly protective film in this embodiment comprises a main body 1, which includes an anti-collision portion 10, a folded edge portion 11, and a heat-seal portion 12. Main body 1 is fixed to the outer side of the electrode assembly via folded edge portion 11 and then heat-seals to the battery cell via heat-seal portion 12. Anti-collision portion 10 provides a collision-proof and cushioning effect for the electrode assembly. The following describes in detail the specific structure and assembly relationship of the aforementioned components of the unit protective film according to the present invention.

[0033] like Figure 1As shown, the main body 1 in this embodiment is used to cover the outer side of the pole group. Therefore, the main body 1 is formed into a rectangular parallelepiped structure corresponding to the pole group. In addition, the thickness of the main body 1 is 0.15mm to 0.2mm, so as to be able to initially reduce the gap between the pole group and the inner wall of the shell. Furthermore, the anti-collision portion 10 is formed in the center of the main body 1. When the main body 1 is connected to the pole group, the anti-collision portion 10 is located at both ends of the pole group in the thickness direction and the first end in the width direction. Furthermore, the folded edge portions 11 are located at both ends of the anti-collision portion 10 in the width direction. The width of each folded edge portion 11 should be adapted to the thickness of the pole group, so that when the main body 1 is covered on the outer side of the pole group, the two folded edge portions 11 are overlapped and arranged at the second end in the width direction of the pole group. In addition, the two folded edge portions 11 in this embodiment are bonded by tape to stably cover the main body 1 on the outer side of the pole group.

[0034] In addition, in this embodiment, the anti-collision portion 10 is formed at the first end in the thickness direction of the main body 1, that is, when the main body 1 is connected to the pole group, the second end in the thickness direction of the main body 1 is in contact with the pole group. The anti-collision portion 10 is formed with a plurality of anti-collision bubbles arranged in a matrix form, and the anti-collision bubbles are formed into a semicircular protruding structure, which can be formed by a process such as stamping (the anti-collision bubble structure is common in the packaging field and belongs to the prior art, so its specific formation process will not be described in detail). The plurality of anti-collision bubbles are evenly spaced, and the distance between any two adjacent anti-collision bubbles along the length direction or width direction of the anti-collision portion 10 is 1mm to 2mm; in addition, the protrusion height of each anti-collision bubble compared to the first end in the thickness direction of the main body 1 is 0.3mm to 0.5mm.

[0035] In addition, the hot melt portion 12 is located at both ends of the anti-collision portion 10 in the length direction. Along the length direction of the main body 1, the extension length of each hot melt portion 12 is ( Figure 1 A) shown in FIG is 8% to 12% of the length of the main body 1 .

[0036] The electrode group protective film of the present invention comprises a main body 1 with an anti-collision portion 10 formed in the center. Folding portions 11 are provided at both ends of the anti-collision portion 10 in the width direction, and hot-melt portions 12 are provided at both ends of the anti-collision portion 10 in the length direction. Thus, the main body 1 is stably wrapped around the outer portion of the electrode group via the folding portions 11, while the anti-collision portion 10 wraps around the side of the electrode group and is then connected to the lower plastic of the battery cell via the hot-melt portion 12. When the battery cell vibrates or experiences other operating conditions, the multiple anti-collision bubbles in the anti-collision portion 10 provide a good anti-collision and cushioning effect, effectively preventing damage to the electrode group and short circuits.

[0037] According to a second aspect of the present invention, a battery cell is provided, such as Figure 2 As shown, the battery cell includes the electrode group protection film as described above, and the hot-melt portion 12 is connected to the cover plate assembly 2 of the battery cell by hot-melt connection.

[0038] According to a third aspect of the present invention, a battery cell module is provided, wherein the battery cell module includes the battery cell described above.

[0039] 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 scope of protection of the present application is not limited thereto. Although the present application has been described in detail with reference to the above-described embodiments, those skilled in the art should understand that any person skilled in the art can modify or easily conceive of changes to the technical solutions described in the above-described embodiments within the technical scope disclosed in the present application, or perform equivalent replacements for some of the technical features thereof. These modifications, changes, or replacements do not deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application shall be subject to the scope of protection of the claims.

Claims

1. A pole group protective film, formed with a main body, characterized in that: The subject includes: an anti-collision portion, located at the center of the main body and formed with a plurality of anti-collision bubbles; Folding portions, located at both ends of the anti-collision portion in the width direction, through which the main body is connected to the pole groups; and The hot-melt portion is used for hot-melt connection with the battery core; the hot-melt portion is located at both ends of the anti-collision portion in the length direction.

2. The electrode group protective film according to claim 1, characterized in that: The thickness of the main body is 0.15 mm to 0.2 mm.

3. The electrode group protective film according to claim 2, characterized in that: The anti-collision portion is formed at a first end of the main body in a thickness direction.

4. The electrode group protective film according to claim 3, characterized in that: A plurality of anti-collision bubbles are arranged in a matrix form.

5. The electrode group protective film according to claim 4, characterized in that: The anti-collision bubbles are evenly distributed, and along the length direction or width direction of the anti-collision portion, the distance between any two adjacent anti-collision bubbles is 1 mm to 2 mm.

6. The electrode group protective film according to claim 3, characterized in that: A protruding height of each anti-collision bubble compared to the first end in the thickness direction of the main body is 0.3 mm to 0.5 mm.

7. The electrode group protective film according to claim 1, characterized in that: When the main body is wrapped around the outer side of the electrode group, the two folded edges overlap and are bonded to each other.

8. The electrode group protective film according to claim 1, characterized in that: Along the length direction of the main body, the extension length of each of the heat-melting portions is 8% to 12% of the length of the main body.

9. A battery cell, characterized in that: The battery cell comprises the electrode group protection film according to any one of claims 1 to 8, and the hot melt portion is hot-melt-connected to the cover plate assembly of the battery cell.

10. A battery cell module, characterized in that: The battery cell module includes the battery cell as claimed in claim 9.

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