Battery cell, battery cell module and battery pack

Abstract

The utility model provides a battery cell, a battery cell module and a battery pack, and relates to the field of battery cell structures. The elastic structure protruding towards the pole group is arranged at the lower plastic part, the elastic structure comprises the insulating part and the limiting part which are connected in sequence, the lower plastic part can be conveniently riveted with other components in the plate body assembly through the insulating part, the limiting part is of a columnar-like structure and abuts against the pole group, and in other words, the pole group can be limited through the limiting part; and the limiting part has certain elasticity, so that the limiting part also has a buffering function, and the damage to the diaphragm of the pole group can be further avoided. Therefore, the safety performance of the battery cell in use is effectively improved.

Description

Technical Field

[0001] The present application relates to the field of battery cell structures, and in particular to a battery cell, a battery cell module and a battery pack. Background Art

[0002] The electrode group in the existing battery cell will shake up and down under vibration conditions, which can easily cause damage to the diaphragm in the electrode group, and may further cause a short circuit between the positive and negative electrodes of the battery cell, affecting the safe use of the battery cell. Utility Model Content

[0003] In view of this, the purpose of the present application is to provide a battery cell, a battery cell module and a battery pack to solve the problem that the electrode group in the existing battery cell will shake under vibration conditions, resulting in reduced safety in the use of the battery cell.

[0004] According to the above purpose, the utility model provides a battery cell, wherein the battery cell comprises:

[0005] Pole group;

[0006] a housing, wherein the pole group is located inside the housing; and

[0007] A cover plate assembly is located at the end of the shell, and the cover plate assembly includes a lower plastic part, the lower plastic part is provided with an elastic structure protruding toward the pole group, the elastic structure includes an insulating part and a limiting part connected in sequence, and the limiting part is formed into a columnar structure and abuts against the pole group.

[0008] Preferably, the limiting portion comprises a limiting platform formed in a disc-shaped structure, and an end surface of the limiting platform abuts against the pole group.

[0009] Preferably, the limiting portion further comprises a plurality of elastic ribs, and the plurality of elastic ribs are distributed at intervals along the circumference of the limiting platform.

[0010] Preferably, each of the elastic ribs is formed into an S-, L- or I-shaped structure, and the first end of each of the elastic ribs in the extension direction is connected to the end face of the limit platform away from the pole group, and the second end of each of the elastic ribs in the extension direction is connected to the insulating part.

[0011] Preferably, the length of the elastic rib is 0.2 mm to 5 mm; the thickness of the elastic rib is 0.5 mm to 0.8 mm.

[0012] Preferably, the insulating portion is formed as a groove-shaped structure protruding toward the pole group, and the inner cavity of the insulating portion passes through the top of the lower plastic part away from the pole group.

[0013] Preferably, the insulating portion is formed with a through hole near the bottom of the pole group, the inner diameter of the through hole is not less than the outer diameter of the limiting platform; and the second end of the elastic rib in the extension direction is arranged to fit the outer edge of the through hole.

[0014] Preferably, a plurality of ventilation holes are formed on the bottom and sides of the insulating portion.

[0015] According to a second aspect of the utility model, a battery cell module is provided, wherein the battery cell module comprises the battery cell described above.

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

[0017] According to the battery cell, battery cell module and battery pack of the utility model, an elastic structure protruding toward the pole group is provided at the lower plastic part, and the elastic structure includes an insulating part and a limiting part connected in sequence, through which the lower plastic part can be easily riveted with other components in the plate assembly, and the limiting part is formed into a columnar structure and abuts against the pole group, that is, the pole group can be limited by the limiting part to avoid shaking of the pole group under vibration conditions, and the limiting part has a certain elasticity, so that the limiting part also has a buffering function, and can further avoid damage to the diaphragm of the pole group. In this way, the safety performance of the battery cell during use is effectively improved.

[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 specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. 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 related drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 is a partial exploded view of a battery cell according to an embodiment of the utility model;

[0021] Figure 2 It is a cross-sectional view of the lower plastic part and the pole group when assembled according to an embodiment of the utility model;

[0022] Figure 3 It is a partial schematic diagram of the lower plastic part according to an embodiment of the utility model;

[0023] Figure 4 is another schematic diagram of a limiting portion according to an embodiment of the utility model.

[0024] Icons: 1-lower plastic part; 10-insulating part; 100-through hole; 101-ventilation hole; 11-limiting part; 110-limiting platform; 111-elastic rib; 2-pole group; 3-shell. DETAILED DESCRIPTION

[0025] 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.

[0026] 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.

[0027] 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.

[0028] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.

[0029] 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. 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] According to the utility model, a battery cell is provided, such as Figures 1 to 4As shown, the battery cell in this embodiment includes a pole group 2, a shell 3 and a cover assembly, wherein the pole group 2 is located inside the shell 3 and the cover assembly is located at the end of the shell 3 (this structure is prior art and will not be described in detail); further, the cover assembly includes a lower plastic part 1, which is provided with an elastic structure protruding toward the pole group 2 so as to abut against the pole group 2, thereby limiting the position of the pole group 2. In the following, the specific structure of the above-mentioned parts of the battery cell according to the utility model will be described in detail.

[0035] In this embodiment, if Figures 1 to 3 As shown, the elastic structure includes an insulating portion 10 and a limiting portion 11 connected in sequence. Specifically, the insulating portion 10 is formed into a groove-shaped structure protruding toward the pole group 2, and the inner cavity of the insulating portion 10 passes through the top of the lower plastic part 1 away from the pole group 2, so as to facilitate the infiltration of the electrolyte and the exhaust of the explosion-proof valve. The insulating portion 10 can facilitate the riveting and fixing of the lower plastic part 1 and the bare aluminum plate in the cover plate assembly. The specifications of the insulating portion 10, such as its length and protruding height, are not specifically limited (in this embodiment, its width is the same as the width of the lower plastic part 1), and should be determined comprehensively according to actual conditions, such as the protruding height of the limiting portion 11 described below, as long as the above-mentioned technical effects can be achieved.

[0036] Furthermore, the insulating portion 10 is also formed with a through hole 100 near the bottom of the electrode group 2, and the limiting portion 11 is connected to the outer edge of the through hole 100. Figure 3 As shown, the limiting portion 11 in this embodiment includes a limiting platform 110 formed into a disc-shaped structure, and the end surface of the limiting platform 110 away from the insulating portion 10 is used to abut against the pole group 2. The limiting portion 11 also includes a plurality of elastic ribs 111, which are distributed at intervals along the circumference of the limiting platform 110. The number and spacing of the elastic ribs 111 are not specifically limited. In addition, as Figure 3 As shown, the elastic ribs 111 in this embodiment are formed into an S-shaped structure, and the first end of each elastic rib 111 in the extension direction is connected to the end face of the limit platform 110 away from the pole group 2, and the second end of each elastic rib 111 in the extension direction is connected to the insulating part 10 (in this embodiment, it is arranged to fit the outer edge of the through hole 100 to facilitate improving the stability and consistency of the structure).

[0037] It should be noted that the material of the elastic structure is consistent with that of the lower plastic part 1 (both are made of plastic), and combined with the structural shape of the elastic rib 111, it can have a certain elasticity in the axial direction of the limit platform 110 (i.e., the extension direction of the elastic rib 111), so that it can limit the electrode group 2 while also playing a certain buffering role to ensure the performance and reliability of the battery cell. Further, in this embodiment, the inner diameter of the through hole 100 is not less than the outer diameter of the limit platform 110 to improve the buffering effect of the elastic rib 111. Preferably, the length of the elastic rib 111 is 0.2mm to 5mm (the length of the elastic rib 111 can be further preferably 0.5 to 2mm, so as to save the internal space of the battery cell while ensuring the strength of the elastic rib 111), and the thickness of the elastic rib 111 is 0.5mm to 0.8mm. The above values ​​are the optimal values ​​obtained after multiple tests to achieve the technical effect of the limit part 11.

[0038] It should be further explained that the shape of the elastic rib 111 is not fixed. Figure 4 As shown, it can also be formed into a C-shaped structure (or an L or I-shaped structure, not shown in the figure), as long as the above-mentioned technical effects can be achieved.

[0039] In this embodiment, if Figure 3 As shown, a plurality of air holes 101 are also formed at the bottom and sides of the insulating portion 10, and there are no specific restrictions on the number, position, shape and size of the air holes 101. Through the air holes 101, a passage from the inside of the battery cell to the outside of the battery cell can be formed (the elastic ribs 111 also form a passage from the inside of the battery cell to the outside), so as to facilitate the infiltration of the electrolyte and the exhaust of the explosion-proof valve.

[0040] According to the battery cell of the utility model, an elastic structure protruding toward the pole group 2 is provided at the lower plastic part 1, and the elastic structure includes an insulating part 10 and a limiting part 11 connected in sequence. The insulating part 10 can facilitate the riveting of the lower plastic part 1 with other components in the plate assembly, and the limiting part 11 is formed into a columnar structure and abuts against the pole group 2, that is, the pole group 2 can be limited by the limiting part 11 to avoid the shaking of the pole group 2 under vibration conditions, and the limiting part 11 has a certain elasticity, so that the limiting part 11 also has a buffering function, and can further avoid the damage of the diaphragm of the pole group 2. In this way, the safety performance of the battery cell during use is effectively improved.

[0041] According to a second aspect of the utility model, a battery cell module is provided, wherein the battery cell module comprises the battery cell described above.

[0042] According to a third aspect of the present invention, a battery pack is provided, wherein the battery pack is provided with the battery cell module as described above.

[0043] 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, characterized in that: The battery cell comprises: Pole group; a housing, wherein the pole group is located inside the housing; and A cover plate assembly is located at the end of the shell, and the cover plate assembly includes a lower plastic part, the lower plastic part is provided with an elastic structure protruding toward the pole group, the elastic structure includes an insulating part and a limiting part connected in sequence, and the limiting part is formed into a columnar structure and abuts against the pole group.

2. The battery cell according to claim 1, characterized in that: The limiting portion includes a limiting platform formed in a disc-shaped structure, and an end surface of the limiting platform abuts against the pole group.

3. The battery cell according to claim 2, characterized in that: The limiting portion further includes a plurality of elastic ribs, and the plurality of elastic ribs are distributed at intervals along the circumference of the limiting platform.

4. The battery cell according to claim 3, characterized in that: Each of the elastic ribs is formed into an S-, L- or I-shaped structure, and a first end of each of the elastic ribs in the extension direction is connected to an end surface of the limit platform away from the pole group, and a second end of each of the elastic ribs in the extension direction is connected to the insulating portion.

5. The battery cell according to claim 3, characterized in that: The length of the elastic rib is 0.2 mm to 5 mm; the thickness of the elastic rib is 0.5 mm to 0.8 mm.

6. The battery cell according to claim 3, characterized in that: The insulating portion is formed as a groove-shaped structure protruding toward the pole group, and an inner cavity of the insulating portion passes through the top of the lower plastic part away from the pole group.

7. The battery cell according to claim 6, characterized in that: The insulating portion is formed with a through hole near the bottom of the pole group, and the inner diameter of the through hole is not less than the outer diameter of the limiting platform; the second end of the elastic rib in the extending direction is arranged to fit the outer edge of the through hole.

8. The battery cell according to claim 6, characterized in that: A plurality of ventilation holes are formed on the bottom and the side of the insulating part.

9. A battery cell module, characterized in that: The battery cell module comprises the battery cell according to any one of claims 1 to 8.

10. A battery pack, characterized in that: The battery pack is provided with the battery cell module as claimed in claim 9.

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