CN210489754U

CN210489754U - Battery center tube structure and cylindrical battery

Info

Publication number: CN210489754U
Application number: CN201921774904.4U
Authority: CN
Inventors: 曹方博; 李金星
Original assignee: Yinlong New Energy Co Ltd
Current assignee: Yinlong New Energy Co Ltd
Priority date: 2019-10-21
Filing date: 2019-10-21
Publication date: 2020-05-08
Anticipated expiration: 2029-10-21

Abstract

The utility model discloses a battery center tube structure and cylinder battery, battery center tube structure is including the center tube that is used for supporting electric core, center tube outer wall middle part is provided with interior concave part, interior concave part is diminished and is formed by center tube outer wall middle part diameter gradually. The cylindrical battery comprises a battery shell, a battery cell accommodated in the battery shell and the central tube structure accommodated in the battery cell. The utility model discloses owing to adopted the center tube structure of reducing, tension in the battery can release, has reduced the imbibition resistance.

Description

Battery center tube structure and cylindrical battery

Technical Field

The utility model relates to a battery technology field, concretely relates to battery center tube and cylinder battery.

Background

Inside electric core of current cylinder battery need be attached to on the center tube structure when convoluteing, and the core is rolled up as the attached carrier support of electric core to the center tube, plays the exhaust simultaneously, and heat conduction, positive negative pole insulating effect prevents to warp after electric core repetitious usage, sinks. However, in the actual manufacturing process of the battery, because the positive and negative electrode plates expand during the liquid injection and charge and discharge processes of the battery core, the generated deformation is released everywhere, so that the electrolyte cannot reach the inside of the battery core, and the electrolyte is poorly infiltrated in the middle of the battery core, thereby affecting the performance of the battery.

In order to solve the above problems, the prior art mainly adopts the following schemes: the utility model with publication number of CN206558590U discloses a lithium battery and a central tube structure of the lithium battery, which release the pressure generated when the battery core deforms in a manner of slotting the central tube; in addition, the patent application with publication number CN104882578A discloses a novel central steel needle for cylindrical battery, which is mainly used to increase the liquid suction rate by making holes on the central tube.

The prior art has the following defects: through the mode of opening holes or slotting the central tube, the electrolyte can directly reach the innermost ring of the battery core, but the infiltration effect of the middle ring is difficult to improve; the tension of the battery cell released by the slotting mode is less, the slotting is 1mm, and the inward deformation space of the battery cell can be increased by (1/pi) mm only.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a battery center tube structure and cylinder battery can release electric core internal tension, further promotes the infiltration effect of electric core inner circle middle part electrolyte. The utility model discloses realize by following technical scheme:

the utility model provides a battery center tube structure, is including the center tube that is used for supporting electric core, its characterized in that, center tube outer wall middle part is provided with interior concave part, interior concave part is formed by the diameter diminishes gradually in center tube outer wall middle part.

As a specific technical scheme, the inner concave part arranged on the outer wall of the central tube is in a multi-section shape, and the multi-section inner concave part forms a bamboo-like reducing structure with multiple reducing positions on the outer wall of the central tube.

As a specific technical scheme, the inner wall diameter of the central tube at the position of the inner concave part is correspondingly reduced.

As a specific technical scheme, the section of the inner hole of the central tube is in a regular hexagon or a circle.

As a specific technical scheme, the battery central tube structure further comprises a PE rubber sleeve which is sleeved on the periphery of the central tube.

A cylindrical battery comprises a battery shell, a battery cell accommodated in the battery shell and a central tube structure accommodated in the battery cell, wherein the central tube structure adopts the central tube structure.

The beneficial effects of the utility model reside in that: owing to adopted the center tube structure of reducing, tension in the battery can release, has reduced the imbibition resistance, the utility model discloses for traditional center tube in same 48 h's time, the imbibition height increases 1 cm.

Drawings

Fig. 1 is a perspective view of a battery center tube structure in an embodiment of the present invention.

Fig. 2 is an exploded view of a battery center tube structure according to an embodiment of the present invention.

Detailed Description

The following description of the embodiments of the present invention will be made with reference to the accompanying drawings:

example one

Referring to fig. 1 and 2, the battery center tube structure provided in this embodiment includes a center tube 10, where the center tube 10 has an inner hole 101 penetrating up and down, and a cross section of the inner hole 101 is a regular hexagon or a circle. An inner concave part 102 is arranged in the middle of the outer wall of the central tube.

In this embodiment, the inner concave portion 102 is formed by gradually reducing the diameter of the middle portion of the outer wall of the center tube. The diameter of the inner wall of the central tube at the position of the concave part 102 is reduced corresponding to the outer wall. It can be understood that the central tube with different shrinkage reducing sizes in the middle can be designed according to the expansion coefficients of batteries made of different materials.

The battery center tube structure provided by this embodiment further includes a PE rubber sleeve 20, which is sleeved on the outer circumference of the center tube 10. The sleeved PE rubber sleeve 20 can be wound by attaching the diaphragm to the rubber sleeve through hot melting, and the PE rubber sleeve can be eliminated under the condition of other winding technologies.

This embodiment reforms transform traditional cylinder body center tube, makes the middle part diameter of the center tube of uniform diameter originally be less than both ends diameter, and electric core middle part tension can release when electric core notes liquid or charge-discharge inflation, makes inside electrolyte reachs the battery more easily. And the mode that the diameter of the middle part of the central tube is gradually reduced prevents the inside of the battery cell from collapsing when the diameter of the central tube is suddenly reduced.

Example two

The difference between the second embodiment and the first embodiment is that the inner concave part 102 arranged on the outer wall of the central tube is at least two sections, that is, a bamboo-like reducing scheme with a plurality of reducing positions is formed on the outer wall of the central tube. In the second embodiment, compared with the first embodiment, the release point of the internal tension is changed, so that the middle tension of the battery cell is released when the battery cell is injected or charged and discharged to expand, and the electrolyte can reach the inside of the battery cell more easily.

EXAMPLE III

The third embodiment provides a cylindrical battery, which comprises a battery shell, a battery cell accommodated in the battery shell, and a central tube structure accommodated in the battery cell, wherein the central tube structure adopts the central tube structure described in the first embodiment or the second embodiment.

The above embodiments are merely for full disclosure and not for limitation, and all changes that can be made without inventive step based on the inventive idea of the present invention should be considered as the scope of the disclosure of the present application.

Claims

1. The utility model provides a battery center tube structure, is including the center tube that is used for supporting electric core, its characterized in that, center tube outer wall middle part is provided with interior concave part, interior concave part is formed by the diameter diminishes gradually in center tube outer wall middle part.

2. The battery center tube structure of claim 1, wherein the inner concave portion of the outer wall of the center tube is multi-sectioned, and the multi-sectioned inner concave portion forms a bamboo-like diameter-changing structure with multiple diameter-changing positions on the outer wall of the center tube.

3. The battery center tube structure according to claim 1 or 2, wherein the inner recess is located at a portion where the inner wall of the center tube is correspondingly shrunk in diameter.

4. The battery center tube structure of claim 1 or 2, wherein the cross section of the inner bore of the center tube is a regular hexagon or a circle.

5. The cell center tube structure according to claim 1 or 2, wherein the cell center tube structure further comprises a PE rubber sleeve, which is sleeved on the outer circumference of the center tube.

6. A cylindrical battery comprises a battery shell, a battery cell accommodated in the battery shell and a central tube structure accommodated in the battery cell, wherein the central tube structure adopts the central tube structure of any one of claims 1 to 5.