Cylindrical battery cell and battery pack

Abstract

The utility model provides a cylindrical battery cell and a battery pack, and belongs to the field of battery structures. A connecting body and an insulator are fixedly connected to form a current collector assembly, and a first connecting part and a second connecting part which are formed by the connecting body are correspondingly connected with a pole and a pole group respectively, so that the centering performance among the current collector assembly, the pole and the pole group is ensured; in addition, the insulator can abut against the inner wall of the shell, so that the centering property of the seven-three-way connector and the shell can be ensured. Therefore, the electrical property of the cylindrical battery cell and the stability of the overall structure can be effectively ensured.

Description

Technical Field

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

[0002] In existing cylindrical cells, the current collector is usually formed as an independent part with a disc-shaped structure, and its two ends in the axial direction are respectively connected to the pole group and the pole column to conduct the current inside the cell to the outside. However, based on the above structure of the current collector, the current collector has poor alignment when assembled with the pole group and the pole column, which will affect the performance of the cell; in addition, the existing cylindrical cell does not have any positioning or limiting structure for the current collector, which will make the current collector, the pole column and the pole group as a whole poorly aligned with the shell after assembly, thereby affecting the stability of the overall structure of the cell. Utility Model Content

[0003] In view of this, the purpose of the present application is to provide a cylindrical battery cell and a battery pack to solve the problem that the existing current collector has poor neutrality during assembly, which affects the battery cell performance and structural stability.

[0004] According to a first aspect of the present invention, a cylindrical battery cell is provided, wherein the cylindrical battery cell comprises:

[0005] A shell, wherein a pole group is disposed inside the shell, and a pole is disposed at the top of the shell; and

[0006] The current collector assembly is provided with a connector and an insulator fixedly connected to each other, wherein the connector is formed with a first connecting portion and a second connecting portion. When the current collector assembly is assembled correspondingly to the shell, the first connecting portion and the second connecting portion are respectively connected correspondingly to the pole and the pole group, and the insulator abuts against the inner wall of the shell.

[0007] Preferably, the connector includes a main body formed into a disk-like structure.

[0008] Preferably, a sink groove is formed on the main body near the top of the pole, the sink groove is formed into a cylindrical structure and the axis of the sink groove is colinear with the axis of the main body.

[0009] Preferably, the first connection portion is formed at the center of the bottom of the sink, and the first connection portion is formed as a boss of a cylindrical structure; the pole is formed with a connection hole corresponding to the boss at the bottom near the connector;

[0010] The bottom of the main body close to the pole group is formed as the second connecting portion.

[0011] Preferably, a welding hole is formed on the top of the pole away from the connector.

[0012] Preferably, the inner diameter of the welding hole is L1, the inner diameter of the connecting hole is L2, the outer diameter of the first connecting portion is L3, and L1≤L3-(L2-L3)=2L3-L2.

[0013] Preferably, the connector further comprises a fitting portion formed as a ring-shaped structure, and the fitting portion is correspondingly connected to the main body;

[0014] In the axial section of the connector, the engaging portion is formed into an L-shaped structure, and the horizontal side of the engaging portion is flush with the top of the pole close to the main body axis direction, and the length of the vertical side of the engaging portion is less than the length in the main body axis direction.

[0015] Preferably, the insulator is also formed into a ring-shaped structure, and the insulator is formed with an embedding groove; in the axial section of the insulator, the embedding groove is formed into an n-shaped structure, and the insulator is correspondingly connected to the connector through the embedding groove.

[0016] Preferably, the outer side wall of the insulator is formed with an inclined surface and a mating surface; when the current collector assembly is assembled with the shell, the mating surface abuts against the inner wall of the shell, and a gap is formed between the inclined surface and the inner wall of the shell.

[0017] According to a second aspect of the present invention, a battery pack is provided, wherein the battery pack comprises the cylindrical battery cell as described above.

[0018] According to the cylindrical battery cell and battery pack of the utility model, the connector and the insulator are fixedly connected to form a current collector assembly, and the first connection part and the second connection part formed by the connector are respectively connected to the pole and the pole group to ensure the centering of the current collector assembly, the pole and the pole group; in addition, the insulator can abut against the inner wall of the shell, so that the centering of the three and the shell can be ensured. In this way, the electrical performance of the cylindrical battery cell and the stability of the overall structure can be effectively guaranteed.

[0019] 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

[0020] 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.

[0021] Figure 1is a partial cross-sectional view of a cylindrical battery cell according to an embodiment of the utility model;

[0022] Figure 2 is a cross-sectional view of a current collector assembly according to an embodiment of the utility model;

[0023] Figure 3 is a cross-sectional view of a connector according to an embodiment of the utility model;

[0024] Figure 4 is a cross-sectional view of an insulator according to an embodiment of the utility model.

[0025] Icon: 10-shell; 11-pole; 110-welding hole; 111-connecting hole; 12-pole group; 2-connector; 20-main body; 200-first connecting part; 201-second connecting part; 202-sunk groove; 21-fitting part; 3-insulator; 30-fitting groove; 31-inclined surface; 32-matching surface; 33-convex part. DETAILED DESCRIPTION

[0026] 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.

[0027] 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.

[0028] 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.

[0029] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] According to a first aspect of the present invention, a cylindrical battery cell is provided. Figures 1 to 4 As shown, the cylindrical battery cell in this embodiment includes a shell 10 and a current collector assembly, wherein a pole group 12 is disposed inside the shell 10, a pole post 11 is disposed at the top of the shell 10, and the current collector assembly is respectively connected to the pole group 12 and the pole post 11 and abuts against the inner wall of the shell 10. In the following, the specific structures of the above-mentioned parts of the cylindrical battery cell according to the utility model will be described in detail.

[0036] In this embodiment, if Figure 1 to Figure 2 As shown, the current collector assembly includes a connector 2, which is formed with a first connection portion 200 and a second connection portion 201 respectively connected to the pole 11 and the pole group 12. Specifically, the connector 2 includes a main body 20 formed in a disk-like structure, and a sink 202 is formed near the top of the pole 11 of the main body 20, and the sink 202 is formed in a cylindrical structure and the axis is colinear with the axis of the main body 20. In addition, a first connection portion 200 is formed at the center of the bottom of the sink 202, and the first connection portion 200 is formed in a boss of a cylindrical structure; correspondingly, a connection hole 111 corresponding to the boss is formed near the bottom of the pole 11 of the connector 2, and a welding hole 110 is formed at the top of the pole 11 away from the connector 2.

[0037] In this way, when the connector 2 is connected to the pole 11, the first connecting part 200 is extended into the connecting hole 111, so that the first connecting part 200 and the connecting hole 111 cooperate to improve the centering of the collector assembly and the pole 11 during assembly; and then the welding hole 110 is penetrated by laser welding so that the top surface of the first connecting part 200 and the connecting hole 111 are melted and connected accordingly.

[0038] In this embodiment, the inner diameter of the welding hole 110 is set to L1, the inner diameter of the connecting hole 111 is set to L2, the outer diameter of the first connecting part 200 is set to L3, and L1≤L3-(L2-L3)=2L3-L2. This ensures that no cold welds are generated when the first connecting part 200 and the connecting hole 111 are welded, thereby improving the welding effect therebetween, thereby further optimizing the assembly process and improving the quality and performance of the battery cell.

[0039] In addition, a second connecting portion 201 is formed at the bottom of the main body 20 close to the electrode group 12 to be connected to the top of the electrode group 12 .

[0040] In this embodiment, if Figure 3 to Figure 4 As shown, the connector 2 also includes an interlocking portion 21 formed as an annular structure, which is correspondingly connected to the main body 20; in the axial section of the connector 2, the interlocking portion 21 is formed as an L-shaped structure, and the horizontal side of the interlocking portion 21 is flush with the top of the main body 20 (close to the pole 11 in the axial direction); along the axial direction of the battery cell, the length of the vertical side of the interlocking portion 21 is less than the length of the main body 20, so as to facilitate the stable connection between the second connecting portion 201 and the pole group 12.

[0041] In this embodiment, the insulator 3 is also formed into a ring structure, and the insulator 3 is formed with an embedding groove 30 corresponding to the connector 2, and the insulator 3 can be connected to the connector 2 through the embedding groove 30; in the axial section of the insulator 3, the embedding groove 30 is formed into a quasi-n-shaped structure. Further, the outer wall of the insulator 3 is formed with an inclined surface 31 and a matching surface 32, when the current collector assembly is assembled with the shell 10, the matching surface 32 can be correspondingly abutted with the inner wall of the shell 10, and a gap is formed between the inclined surface 31 and the inner wall of the shell 10, and the smoothness of the current collector assembly and the pole group 12 when placed in the shell 10 can be improved through the inclined surface 31, and the centering of the assembly of the current collector assembly and the shell 10 can be ensured through the matching surface 32; further, the top surface of the insulator 3 is formed with a convex portion 33, and the shell 10 is formed with a concave portion corresponding to the convex portion 33, so as to increase the stability and accuracy of the assembly of the current collector assembly and the shell 10.

[0042] It should be noted that the connector 2 in this embodiment is made by stamping, and then the current collector assembly is made by plastic material and injection molding, that is, the insulator 3 is made of the plastic material by injection molding. It should be further noted that there is no specific limitation on the size of each of the above components, which should be determined comprehensively according to the actual situation, such as the specifications of the cylindrical battery cell, as long as the above technical effects can be achieved.

[0043] Through the cylindrical battery cell as described above in this embodiment, the connector 2 and the insulator 3 are fixedly connected to form a current collector assembly, and the first connecting portion 200 and the second connecting portion 201 formed by the connector are respectively connected to the pole 11 and the pole group 12 to ensure the centering of the current collector assembly, the pole 11 and the pole group 12; in addition, the insulator 3 can abut against the inner wall of the shell 10, so that the centering of the shell 10 can be ensured. In this way, the electrical performance of the cylindrical battery cell and the stability of the overall structure can be effectively guaranteed.

[0044] In addition, according to a second aspect of the present invention, a battery pack is provided, the battery pack comprising the cylindrical battery cell as described above.

[0045] 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 should be described in the protection scope of the claims.

Claims

1. A cylindrical battery cell, characterized in that: The cylindrical battery cell comprises: A shell, wherein a pole group is disposed inside the shell, and a pole is disposed at the top of the shell; and The current collector assembly is provided with a connector and an insulator fixedly connected to each other, wherein the connector is formed with a first connecting portion and a second connecting portion. When the current collector assembly is assembled correspondingly to the shell, the first connecting portion and the second connecting portion are respectively connected correspondingly to the pole and the pole group, and the insulator abuts against the inner wall of the shell.

2. The cylindrical battery cell according to claim 1, characterized in that: The connector includes a main body formed into a disk-like structure.

3. The cylindrical battery cell according to claim 2, characterized in that: The main body is formed with a sink groove near the top of the pole, the sink groove is formed into a cylindrical structure, and the axis of the sink groove is colinear with the axis of the main body.

4. The cylindrical battery cell according to claim 3, characterized in that: The first connection part is formed at the center of the bottom of the sink, and the first connection part is formed as a boss of a cylindrical structure; the pole is formed with a connection hole corresponding to the boss at the bottom near the connector; The bottom of the main body close to the pole group is formed as the second connecting portion.

5. The cylindrical battery cell according to claim 4, characterized in that: A welding hole is formed on the top of the pole away from the connecting body.

6. The cylindrical battery cell according to claim 5, characterized in that: The inner diameter of the welding hole is L1, the inner diameter of the connecting hole is L2, the outer diameter of the first connecting portion is L3, and L1≤L3-(L2-L3)=2L3-L2.

7. The cylindrical battery cell according to claim 3, characterized in that: The connector also includes a fitting portion formed into a ring-shaped structure, and the fitting portion is correspondingly connected to the main body; In the axial section of the connector, the engaging portion is formed into an L-shaped structure, and the horizontal side of the engaging portion is flush with the top of the pole close to the main body axis direction, and the length of the vertical side of the engaging portion is less than the length in the main body axis direction.

8. The cylindrical battery cell according to claim 1, characterized in that: The insulator is also formed into a ring-shaped structure, and is formed with an embedding groove; in the axial section of the insulator, the embedding groove is formed into an n-shaped structure, and the insulator is correspondingly connected to the connector through the embedding groove.

9. The cylindrical battery cell according to claim 1, characterized in that: The outer wall of the insulator is formed with an inclined surface and a matching surface; when the current collector assembly is assembled with the shell, the matching surface abuts against the inner wall of the shell, and a gap is formed between the inclined surface and the inner wall of the shell.

10. A battery pack, characterized in that: A cylindrical battery cell comprising any one of claims 1 to 9.

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