Cylindrical battery and battery pack

Abstract

The utility model provides a cylindrical battery and a battery pack, and relates to the field of battery structures. The cylindrical battery includes: a pole group; the pole assembly is provided with a pole and a sealing element group which is correspondingly riveted with the pole, the pole is sequentially provided with a fixing part, a columnar part and a connecting part, and the sealing element group is arranged on the outer side part of the columnar part in a sleeving manner; the connecting part is directly connected with the pole group; and a shell, wherein the pole group and the connecting part are located in the shell. According to the pole in the cylindrical battery, the functions of a current collector, an aluminum block and a pole in the prior art are integrated, and compared with an existing cylindrical battery, the number of parts and the welding process are effectively reduced, so that the production cost is effectively reduced, and the production qualification rate is improved.

Description

Technical Field

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

[0002] In existing cylindrical batteries, the current collector and aluminum block are usually stamped and formed, then welded together into one part, and then welded to the electrode group; after the electrode group is installed in the shell, the aluminum block, current collector and electrode group are welded to the electrode column to lead the current inside the battery to the outside. However, this structure has many parts and the production process is complicated (that is, there are multiple welding processes), which leads to high production costs and low production qualification rate. Utility Model Content

[0003] In view of this, the purpose of the present application is to provide a cylindrical battery and a battery pack to solve the problem that existing cylindrical batteries have many parts and a relatively complicated production process.

[0004] According to the above purpose, the first aspect of the present utility model provides a cylindrical battery, wherein the cylindrical battery comprises:

[0005] Pole group;

[0006] A pole assembly is provided with a pole and a sealing member group riveted to the pole, wherein the pole is sequentially formed with a fixing portion, a columnar portion and a connecting portion, the sealing member group is sleeved on the outer portion of the columnar portion; the connecting portion is directly connected to the pole group; and

[0007] The housing is provided with the pole group and the connecting part being located inside the housing.

[0008] Preferably, before the pole is riveted, the fixing portion is formed with a groove structure, and the outer diameter of the fixing portion is the same as the outer diameter of the columnar portion.

[0009] Preferably, after the pole is riveted, the fixing portion is folded toward the direction close to the connecting portion, so that the axial cross section of the pole is formed into an I-shaped structure, and the fixing portion is pressed on the top of the sealing component assembly.

[0010] Preferably, the connecting portion is formed into a disc-shaped structure corresponding to the end surface of the pole group.

[0011] Preferably, the sealing component set includes an upper plastic, a welding ring, a sealing ring and a lower plastic.

[0012] Preferably, the lower plastic is formed with an inner ring and an outer ring, and the inner ring and the outer ring are connected by a plurality of reinforcing ribs; the inner ring is adapted to correspond to the sealing ring so that the lower plastic sleeve is arranged on the outer side wall of the sealing ring.

[0013] Preferably, along the axial direction of the pole assembly, the outer wall of the outer ring is formed with a limiting portion extending in a direction away from the fixing portion, and the limiting portion abuts against the outer wall of the connecting portion; and / or the outer wall of the limiting portion is formed as an inclined surface.

[0014] Preferably, the reinforcing ribs are formed into a rectangular plate structure, and the reinforcing ribs extend along the radial direction of the lower plastic; and / or a plurality of the reinforcing ribs are evenly distributed at intervals.

[0015] Preferably, the connecting portion is welded to the pole group.

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

[0017] According to the cylindrical battery and battery pack of the utility model, the pole assembly includes a pole and a sealing member group riveted to the pole, the pole is sequentially formed with a fixing portion, a columnar portion and a connecting portion, the sealing member group is sleeved on the outer portion of the columnar portion, and the connecting portion is directly connected to the pole group. That is, the pole in the cylindrical battery integrates the functions of the current collector, aluminum block and pole in the prior art, and compared with the existing cylindrical battery, the number of parts and the welding process are effectively reduced, thereby effectively reducing the production cost and improving the production qualification rate.

[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 cross-sectional view of a cylindrical battery according to an embodiment of the utility model;

[0021] Figure 2 is a cross-sectional view of a pole in a first state according to an embodiment of the utility model;

[0022] Figure 3 is a cross-sectional view of a pole in a second state according to an embodiment of the utility model;

[0023] Figure 4 It is a partial schematic diagram of a cylindrical battery according to an embodiment of the utility model.

[0024] Icon: 1-shell; 2-pole; 20-fixing part; 21-columnar part; 22-connecting part; 30-upper plastic; 31-welding ring; 32-sealing ring; 33-lower plastic; 330-reinforcement rib; 331-limiting part; 4-pole group. 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 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.

[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 a first aspect of the present invention, a cylindrical battery is provided. Figures 1 to 4As shown, the cylindrical battery in this embodiment includes a pole group 4 and a pole column 2 assembly connected to the pole group 4, and the pole group 4 and the pole column 2 assembly are connected and arranged inside the housing 1. In this embodiment, the pole column 2 assembly includes a pole column 2 and a sealing component assembly riveted corresponding to the pole column 2, and the pole column 2 is sequentially formed with a fixing portion 20, a columnar portion 21 and a connecting portion 22, and the sealing component assembly is correspondingly sleeved on the outer portion of the columnar portion 21, and the pole column 2 is directly connected to the pole group 4 through the connecting portion 22. In the following, the specific structure of the above-mentioned parts of the cylindrical battery according to the utility model will be described in detail.

[0035] like Figure 2 As shown, before the pole 2 is riveted (i.e., during the assembly of the sealing assembly), the extension direction of the fixing portion 20 is the same as the extension direction of the columnar portion 21 and the outer diameter of the fixing portion 20 is the same as the outer diameter of the columnar portion 21, so that the axial cross-section of the pole 2 is formed into a T-shaped structure, thereby facilitating the sleeve installation of the sealing assembly described below; in addition, the fixing portion 20 at this time is formed with a groove structure to facilitate the subsequent riveting process of the pole 2. When the sealing assembly and the pole 2 are assembled, the fixing portion 20 can be stamped through a stamping process so that the fixing portion 20 is folded toward the direction close to the connecting portion 22, so that the axial cross-section of the pole 2 is formed into a "I"-shaped structure (such as Figure 3 As shown), the sealing component assembly can be arranged between the fixing portion 20 and the connecting portion 22, that is, the fixing portion 20 is pressed on the top of the sealing component assembly.

[0036] It should be noted that the connection process between the sealing group and the pole 2 is a conventional technical means in the existing cylindrical battery, so there is no specific restriction on the specific connection process. For example, in this embodiment, the sealing group and the pole 2 are press-fitted and riveted through the above-mentioned structure, and then the welding ring 31 in the sealing group is connected to the shell 1 accordingly through penetration welding to improve the sealing performance and structural strength of the overall structure of the cylindrical battery.

[0037] Furthermore, the connection portion 22 in this embodiment is formed into a disc-shaped structure corresponding to the end face of the electrode group 4. When the pole assembly is assembled with the pole group 4, the connection portion 22 is welded to the end face of the pole group 4. It should be noted that there is no specific restriction on the size of each structure of the pole 2, that is, there is no specific restriction on the size of the fixing portion 20, the columnar portion 21 and the connection portion 22, which should be determined comprehensively according to actual conditions, such as the specifications of the cylindrical battery, as long as it can meet the use requirements of the cylindrical battery.

[0038] In this embodiment, if Figure 1 and Figure 4As shown, the sealing component group includes an upper plastic 30, a welding ring 31, a sealing ring 32 and a lower plastic 33, and the upper plastic 30, the welding ring 31 and the sealing ring 32 are all existing components. In addition, the lower plastic 33 in this embodiment is formed with an inner ring and an outer ring, and the inner ring and the outer ring are connected by a plurality of reinforcing ribs 330. Specifically, the inner ring is adapted to correspond to the sealing ring 32 so that the lower plastic 33 is sleeved on the outer side wall of the sealing ring 32 through the inner ring. More specifically, along the axial direction of the pole 2 assembly, the outer side wall of the outer ring is formed with a limiting portion 331 extending in a direction away from the fixing portion 20, and the limiting portion 331 is in contact with the outer side wall of the connecting portion 22, that is, the connecting portion 22 can be covered by the setting of the limiting portion 331, thereby effectively improving the stability of the connection between the sealing component group and the pole 2. In addition, the outer side wall of the limiting portion 331 is formed as an inclined surface to ensure smooth assembly of the connection body after welding of the pole 2 assembly and the pole group 4 with the housing 1, thereby improving assembly efficiency and assembly quality. The outer side wall of the bottom end of the limiting portion 331 corresponds to the inner wall of the housing 1 to ensure the central symmetry of the pole 2 assembly and the housing 1.

[0039] In addition, in this embodiment, the reinforcing ribs 330 are formed into a rectangular plate structure, and each reinforcing rib 330 extends radially along the lower plastic 33; multiple reinforcing ribs 330 are evenly spaced to divide the welding area of ​​the pole 2 and the pole group 4 into sub-areas, that is, while improving the stability of the overall structure of the lower plastic 33, the stability of the connection between the pole 2 and the pole group 4 can also be ensured.

[0040] According to the cylindrical battery of the utility model, the pole 2 assembly includes the pole 2 and a sealing member group riveted to the pole 2, the pole 2 is sequentially formed with a fixing portion 20, a columnar portion 21 and a connecting portion 22, the sealing member group is sleeved on the outer portion of the columnar portion 21, and the connecting portion 22 is directly connected to the pole group 4. That is, the pole 2 in the cylindrical battery integrates the functions of the current collector, the aluminum block and the pole 2 in the prior art, and compared with the existing cylindrical battery, the number of parts and the welding process are effectively reduced, thereby effectively reducing the production cost and improving the production qualification rate.

[0041] According to a second aspect of the present invention, a battery pack is provided, wherein the battery pack is provided with the cylindrical battery as described above.

[0042] 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 cylindrical battery, characterized in that: The cylindrical battery comprises: Pole group; A pole assembly is provided with a pole and a sealing member group riveted to the pole, wherein the pole is sequentially formed with a fixing portion, a columnar portion and a connecting portion, the sealing member group is sleeved on the outer portion of the columnar portion; the connecting portion is directly connected to the pole group; and The housing is provided with the pole group and the connecting part being located inside the housing.

2. The cylindrical battery according to claim 1, characterized in that: Before the pole is riveted, the fixing portion is formed with a groove structure, and the outer diameter of the fixing portion is the same as the outer diameter of the columnar portion.

3. The cylindrical battery according to claim 2, characterized in that: After the pole is riveted, the fixing portion is folded toward the direction close to the connecting portion, so that the axial cross section of the pole is formed into an "I"-shaped structure, and the fixing portion is pressed on the top of the sealing component group.

4. The cylindrical battery according to claim 1, characterized in that: The connecting portion is formed into a disc-shaped structure corresponding to the end surface of the pole group.

5. The cylindrical battery according to claim 1, characterized in that: The sealing component set includes an upper plastic, a welding ring, a sealing ring and a lower plastic.

6. The cylindrical battery according to claim 5, characterized in that: The lower plastic is formed with an inner ring and an outer ring, and the inner ring and the outer ring are connected by a plurality of reinforcing ribs; the inner ring is adapted to correspond to the sealing ring so that the lower plastic sleeve is arranged on the outer side wall of the sealing ring.

7. The cylindrical battery according to claim 6, characterized in that: Along the axial direction of the pole assembly, the outer wall of the outer ring is formed with a limiting portion extending in a direction away from the fixing portion, and the limiting portion abuts against the outer wall of the connecting portion; and / or the outer wall of the limiting portion is formed as an inclined surface.

8. The cylindrical battery according to claim 6, characterized in that: The reinforcing ribs are formed into a rectangular plate structure, and the reinforcing ribs extend along the radial direction of the lower plastic; and / or a plurality of the reinforcing ribs are evenly distributed at intervals.

9. The cylindrical battery according to claim 1, characterized in that: The connecting portion is welded to the pole group.

10. A battery pack, characterized in that: The battery pack is provided with a cylindrical battery as claimed in any one of claims 1 to 9.

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