Battery cell flattening center needle

Abstract

The utility model relates to a battery cell rubbing center needle which comprises a center needle body, the center needle body is of a cylindrical structure, and the head of the center needle body is a bearing. The utility model has the advantages that the structure is reasonable, short circuit caused by piercing the diaphragm is prevented, the diaphragm is prevented from wrinkling, and the problems of tab damage and diaphragm wrinkling are effectively solved.

Description

Technical Field

[0001] This utility model belongs to the technical field of battery cell tools, specifically relating to a battery cell flattening center needle. Background Technology

[0002] In existing technologies, the tabs at the edge of the center hole of the battery cell often have sharp corner structures. These sharp corner structures can puncture the separator, causing the positive and negative electrodes to come into contact, resulting in a short circuit in the battery cell. This seriously affects the battery cell production yield and safety performance. Traditional flattening heads are difficult to completely flatten the tabs at the edge of the center hole of the battery cell, and tab damage is easy to occur during the flattening process. Therefore, it is very necessary to provide a battery cell flattening center needle with a reasonable structure that prevents puncture and short circuit of the separator, avoids separator wrinkles, and effectively solves the problems of tab damage and separator wrinkles. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a battery cell flattening center needle with a reasonable structure, which prevents diaphragm puncture and short circuit, avoids diaphragm wrinkles, and effectively solves the problems of electrode tab damage and diaphragm wrinkles.

[0004] The purpose of this utility model is achieved as follows: a center needle, including a center needle body, the center needle body having a cylindrical structure, and the head of the center needle body being a bearing.

[0005] A battery cell flattening center needle includes a base, several mounting seats, and a flattening head. The mounting seats are fixedly connected to the surface of the base, and the flattening head is rotatably connected to the mounting seats. The center needle body is a cylindrical structure and is fixedly connected to the center position of the base, with the length direction of the center needle body perpendicular to the surface of the base.

[0006] The chassis rotates under the drive of the rotary drive component, the flattening head rotates on its own under the drive of the rotary drive component, and the chassis slowly moves forward under the push of the longitudinal drive component.

[0007] The rotary drive component is a motor, and the longitudinal drive component is an electric telescopic rod, a hydraulic telescopic rod, or other linear drive structure.

[0008] The mounting bases are evenly distributed circumferentially relative to the center of the chassis.

[0009] A battery cell includes a cylindrical battery cell fixed in front of a flattening head, wherein the central hole of the cylindrical battery cell is directly opposite the central needle body.

[0010] The flattening head is conical on the side near the center of the chassis, and the conical surface of the flattening head abuts against the end of the cylindrical battery cell.

[0011] The contact surfaces of the conical surface of the flattened head and the end of the cylindrical battery cell are located on the same plane and perpendicular to the central axis of the chassis.

[0012] The beneficial effects of this utility model are as follows: This utility model is a flattening center needle for battery cells, which optimizes existing flattening center needles. In use, a bearing with the same diameter as the center hole of the cylindrical battery cell is added to the head of the center needle body. When the flattening center needle body is inserted into the center hole of the cylindrical battery cell, it fits tightly with the center hole, preventing the tabs from puncturing the diaphragm and causing a short circuit. Furthermore, the bearing can rotate together with the cylindrical battery cell, preventing the diaphragm in the center hole from wrinkling due to external force. The bearing on the center needle body of this utility model ensures that after the center needle body is inserted into the center hole of the cylindrical battery cell… The connection between the center needle body and the wall of the central hole of the cylindrical battery cell is changed from a rigid friction connection to a rolling friction connection. This reduces the force exerted by the center needle body on the central hole of the cylindrical battery cell when the flattening head flattens the end face of the cell, preventing damage to the tabs or other defects, and avoiding damage to the diaphragm. This effectively solves the technical problems of tab damage at the central hole and diaphragm wrinkling at the central hole of the battery cell during the tab flattening process. This invention has the advantages of reasonable structure, prevention of diaphragm puncture and short circuit, avoidance of diaphragm wrinkling, and effective solution to the problems of tab damage and diaphragm wrinkling. Attached Figure Description

[0013] Figure 1 This is a front view of the center needle for flattening a battery cell according to the present invention.

[0014] Figure 2 This is a cross-sectional view of a battery cell flattening center needle according to the present invention.

[0015] Figure 3 This is a cross-sectional view of the center needle body of the battery cell flattening center needle of this utility model.

[0016] Figure 4 This is a schematic diagram of the bearing structure for the flattening center needle of a battery cell according to this utility model.

[0017] Figure 5 This is a schematic diagram of the structure of a cylindrical battery cell with a flattened center pin according to the present invention.

[0018] In the diagram: 1. Cylindrical battery cell; 2. Flattened head; 3. Center pin body; 4. Mounting base; 5. Bearing; 6. Chassis. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings. Example

[0020] like Figure 1-5As shown, a center needle includes a center needle body 3, which is a cylindrical structure, and the head of the center needle body 3 is a bearing 5.

[0021] In this embodiment, the bearing at the head of the cylindrical center needle body is used to insert into the central hole of the cylindrical battery cell.

[0022] This utility model has the following advantages: ① The flattened center needle body fits tightly with the center hole of the cylindrical battery cell, preventing any damaged tabs from entering and damaging the diaphragm; ② The head of the center needle body has a bearing, which can prevent the diaphragm at the center hole of the cylindrical battery cell from wrinkling and breaking when the battery cell is flattened and the center needle body rotates.

[0023] This invention relates to a flattening center needle for battery cells, optimizing existing flattening center needles. In use, the head of the center needle body 3 is equipped with a bearing 5 whose diameter matches the center hole diameter of the cylindrical battery cell 1. When the flattening center needle body 3 is inserted into the center hole of the cylindrical battery cell 1, it fits tightly against the center hole, preventing the tabs from puncturing the diaphragm and causing a short circuit. Furthermore, the bearing 5 can rotate together with the cylindrical battery cell 1, preventing the diaphragm from wrinkling due to external force. The bearing 5 on the center needle body 3 ensures that after the center needle body 3 is inserted into the center hole of the cylindrical battery cell 1, the center needle... The rigid friction connection between the body 3 and the central hole wall of the cylindrical battery cell 1 is changed to a rolling friction connection. This reduces the force exerted by the central needle body 3 on the central hole of the cylindrical battery cell 1 when the flattening head flattens the end face of the cylindrical battery cell 1, thus preventing damage to the tabs or other defects and avoiding damage to the diaphragm. This effectively solves the technical problems of tab damage at the central hole and diaphragm wrinkling at the central hole of the battery cell during the tab flattening process. This utility model has the advantages of reasonable structure, prevention of diaphragm puncture and short circuit, avoidance of diaphragm wrinkling, and effective solution to the problems of tab damage and diaphragm wrinkling. Example

[0024] like Figure 1-5 As shown, a battery cell flattening center needle includes a base 6, several mounting seats 4, and a flattening head 2. The mounting seats 4 are fixedly connected to the surface of the base 6, and the flattening head 2 is rotatably connected to the mounting seats 4. The center needle body 3 is a cylindrical structure and is fixedly connected to the center position of the base 6, and the length direction of the center needle body 3 is perpendicular to the surface of the base 6.

[0025] The chassis 6 rotates under the drive of the rotary drive component, the flattening head 2 rotates on its own under the drive of the rotary drive component, and the chassis 6 slowly moves forward under the push of the longitudinal drive component.

[0026] The rotary drive component is a motor, and the longitudinal drive component is an electric telescopic rod, a hydraulic telescopic rod, or other linear drive structure.

[0027] The mounting base 4 is evenly distributed circumferentially relative to the center of the chassis 6.

[0028] This invention relates to a flattening center needle for battery cells, optimizing existing flattening center needles. In use, the head of the center needle body 3 is equipped with a bearing 5 whose diameter matches the center hole diameter of the cylindrical battery cell 1. When the flattening center needle body 3 is inserted into the center hole of the cylindrical battery cell 1, it fits tightly against the center hole, preventing the tabs from puncturing the diaphragm and causing a short circuit. Furthermore, the bearing 5 can rotate together with the cylindrical battery cell 1, preventing the diaphragm from wrinkling due to external force. The bearing 5 on the center needle body 3 ensures that after the center needle body 3 is inserted into the center hole of the cylindrical battery cell 1, the center needle... The rigid friction connection between the body 3 and the central hole wall of the cylindrical battery cell 1 is changed to a rolling friction connection. This reduces the force exerted by the central needle body 3 on the central hole of the cylindrical battery cell 1 when the flattening head flattens the end face of the cylindrical battery cell 1, thus preventing damage to the tabs or other defects and avoiding damage to the diaphragm. This effectively solves the technical problems of tab damage at the central hole and diaphragm wrinkling at the central hole of the battery cell during the tab flattening process. This utility model has the advantages of reasonable structure, prevention of diaphragm puncture and short circuit, avoidance of diaphragm wrinkling, and effective solution to the problems of tab damage and diaphragm wrinkling. Example

[0029] like Figure 1-5 As shown, a battery cell also includes a cylindrical battery cell 1, which is fixed in front of the flattening head 2, and the central hole of the cylindrical battery cell 1 is directly opposite the central needle body 3.

[0030] The side of the flattening head 2 closest to the center of the base plate 6 is conical, and the conical surface of the flattening head 2 abuts against the end of the cylindrical battery cell 1.

[0031] The contact surfaces of the conical surface of the flattened head 2 and the end of the cylindrical battery cell 1 are located on the same plane and are perpendicular to the central axis of the chassis 6.

[0032] In this embodiment, the chassis rotates under the drive of a rotary drive (which can be a motor), and the flattening head rotates on its own under the drive of another motor. Then, the chassis slowly moves forward under the push of a longitudinal drive (which can be an electric telescopic rod or a hydraulic telescopic rod). The center needle body is inserted into the center hole of the cylindrical battery cell. The conical surface of the flattening head gradually contacts the end face of the cylindrical battery cell. The conical surface of the flattening head slides on the end face of the cylindrical battery cell and presses forward (the cylindrical battery cell itself does not move). After a certain period of time, the cone of the flattening head moves forward a certain distance, that is, it compresses the end face of the cylindrical battery cell by a certain distance. At this time, the end face is very flat, and there is no damage to the tabs or other defects around the center hole, thus completing the flattening process of the battery cell end face.

[0033] This invention relates to a flattening center needle for battery cells, optimizing existing flattening center needles. In use, the head of the center needle body 3 is equipped with a bearing 5 whose diameter matches the center hole diameter of the cylindrical battery cell 1. When the flattening center needle body 3 is inserted into the center hole of the cylindrical battery cell 1, it fits tightly against the center hole, preventing the tabs from puncturing the diaphragm and causing a short circuit. Furthermore, the bearing 5 can rotate together with the cylindrical battery cell 1, preventing the diaphragm from wrinkling due to external force. The bearing 5 on the center needle body 3 ensures that after the center needle body 3 is inserted into the center hole of the cylindrical battery cell 1, the center needle... The rigid friction connection between the body 3 and the central hole wall of the cylindrical battery cell 1 is changed to a rolling friction connection. This reduces the force exerted by the central needle body 3 on the central hole of the cylindrical battery cell 1 when the flattening head flattens the end face of the cylindrical battery cell 1, thus preventing damage to the tabs or other defects and avoiding damage to the diaphragm. This effectively solves the technical problems of tab damage at the central hole and diaphragm wrinkling at the central hole of the battery cell during the tab flattening process. This utility model has the advantages of reasonable structure, prevention of diaphragm puncture and short circuit, avoidance of diaphragm wrinkling, and effective solution to the problems of tab damage and diaphragm wrinkling.

Claims

1. A central pin, characterized in that: It includes a central needle body, which is a cylindrical structure, and the head of the central needle body is a bearing.

2. A battery cell flattening center needle, comprising the center needle of claim 1, characterized in that: It also includes a chassis, several mounting bases, and a flattening head. The mounting bases are fixedly connected to the surface of the chassis, and the flattening head is rotatably connected to the mounting bases. The center needle body is a cylindrical structure and is fixedly connected to the center of the chassis, with the length direction of the center needle body perpendicular to the surface of the chassis.

3. The battery cell flattening center needle according to claim 2, characterized in that: The chassis rotates under the drive of the rotary drive component, the flattening head rotates on its own under the drive of the rotary drive component, and the chassis slowly moves forward under the push of the longitudinal drive component.

4. The battery cell flattening center needle according to claim 3, characterized in that: The rotary drive component is a motor, and the longitudinal drive component is an electric telescopic rod or a hydraulic telescopic rod linear drive structure.

5. The battery cell flattening center needle according to claim 2, characterized in that: The mounting bases are evenly distributed circumferentially relative to the center of the chassis.

6. A battery cell, comprising the battery cell flattening center needle as described in claim 1, characterized in that: It also includes a cylindrical battery cell, which is fixed in front of the flattening head, with the central hole of the cylindrical battery cell facing the central needle body.

7. A battery cell according to claim 6, characterized in that: The flattening head is conical on the side near the center of the chassis, and the conical surface of the flattening head abuts against the end of the cylindrical battery cell.

8. A battery cell according to claim 7, characterized in that: The contact surfaces of the conical surface of the flattened head and the end of the cylindrical battery cell are located on the same plane and perpendicular to the central axis of the chassis.

Images