JP-2026514262-A - Battery cell case and method for manufacturing the same

Abstract

The battery cell case and its manufacturing method according to the present invention include a case and a cover, the periphery of which a first edge bend and a second edge bend are formed, respectively, the first edge bend and the second edge bend are overlapped and wound around each other to form a wound structure, and the first edge bend and the second edge bend are folded to form a wrinkle structure located between the wound structure and the periphery of the case and cover. Problems arising in the welding process can be avoided, the requirements for fitting the case and cover can be reduced, the structure can be simplified, and costs can be reduced.

Inventors

• ▲陳▼ ▲剣▼▲偉▼
• ▲劉▼ ▲偉▼
• 郭 元
• 李 文▲亮▼
• 黄 奕棋
• ▲楊▼ 新星
• 李 水源

Assignees

• 孚能科技（▲ガン▼州）股▲フン▼有限公司

Dates

Publication Date

20260508

Application Date

20231027

Priority Date

20230227

Claims (15)

1. Including a case and a cover, the case has a first edge bend formed on its periphery, and the cover has a second edge bend formed on its periphery, and the first edge bend and the second edge bend are overlapped and wound around each other to form a wound structure. The first edge bend portion and the second edge bend portion are folded to form a wrinkle structure, and the wrinkle structure is located between the winding structure and the peripheral edges of the case and the cover. The wrinkled structure includes at least one bent projection, which is formed by bending a first edge bent portion and a second edge bent portion, both of which are planar, in the same direction, in a battery cell case.
2. The battery cell case according to claim 1, wherein the portions constituting the bent projections of the first and second edge bends are in complete contact.
3. The portion constituting the bent projection of the first edge bend is a first portion, and the portion constituting the bent projection of the second edge bend is a second portion, wherein the second portion has a contact portion and a wrinkled portion, the contact portion is in contact with the first portion, and the wrinkled portion is bent in a direction away from the first portion, as described in claim 1.
4. The first portion includes a planar portion parallel to the plane on which the first and second edge-bent portions are located, and a vertical portion perpendicular to the plane on which the first and second edge-bent portions are located, The aforementioned contact portion is in close contact with the flat portion, The battery cell case according to claim 3, wherein the wrinkled portion is provided in correspondence with the vertical portion and protrudes in a direction parallel to the plane in which the first edge bend portion and the second edge bend portion are located, with respect to the vertical portion.
5. The winding structure is formed by winding the planar first edge bent portion and the second edge bent portion, the winding structure is superimposed on the planar first edge bent portion and the non-winding portion of the second edge bent portion, the portion of the first edge bent portion constituting the winding structure becomes the third portion, and the portion of the second edge bent portion constituting the winding structure becomes the fourth portion, and here, The battery cell case according to claim 1, wherein the third portion includes an overlapping portion and an extension portion, the overlapping portion overlapping with the fourth portion, and the extension portion being bent from the outer peripheral edge of the overlapping portion and extending to the side of the fourth portion opposite to the overlapping portion and overlapping with the fourth portion.
6. The winding structure is formed by winding the planar first edge bent portion and the second edge bent portion, the winding structure is superimposed on the planar first edge bent portion and the non-winding portion of the second edge bent portion, the portion of the first edge bent portion constituting the winding structure becomes the third portion, and the portion of the second edge bent portion constituting the winding structure becomes the fourth portion, and here, The battery cell case according to claim 2, wherein the third portion includes an overlapping portion and an extension portion, the overlapping portion overlapping with the fourth portion, and the extension portion being bent from the outer peripheral edge of the overlapping portion and extending to the side of the fourth portion opposite to the overlapping portion and overlapping with the fourth portion.
7. The winding structure is formed by winding the planar first edge bent portion and the second edge bent portion, the winding structure is superimposed on the planar first edge bent portion and the non-winding portion of the second edge bent portion, the portion of the first edge bent portion constituting the winding structure becomes the third portion, and the portion of the second edge bent portion constituting the winding structure becomes the fourth portion, and here, The battery cell case according to claim 3, wherein the third portion includes an overlapping portion and an extension portion, the overlapping portion overlapping with the fourth portion, and the extension portion being bent from the outer peripheral edge of the overlapping portion and extending to the side of the fourth portion opposite to the overlapping portion and overlapping with the fourth portion.
8. The winding structure is formed by winding the planar first edge bent portion and the second edge bent portion, the winding structure is superimposed on the planar first edge bent portion and the non-winding portion of the second edge bent portion, the portion of the first edge bent portion constituting the winding structure becomes the third portion, and the portion of the second edge bent portion constituting the winding structure becomes the fourth portion, and here, The battery cell case according to claim 4, wherein the third portion includes an overlapping portion and an extension portion, the overlapping portion overlapping with the fourth portion, and the extension portion being bent from the outer peripheral edge of the overlapping portion and extending to the side of the fourth portion opposite to the overlapping portion and overlapping with the fourth portion.
9. A sealing layer is provided between the two overlapping surfaces of the third and fourth portions, as described in claim 5 of the battery cell case.
10. A sealing layer is provided between the two overlapping surfaces of the third and fourth portions, as described in claim 6 of the battery cell case.
11. A sealing layer is provided between the two overlapping surfaces of the third and fourth portions, as described in claim 7.
12. A sealing layer is provided between the two overlapping surfaces of the third and fourth portions, as described in claim 8 of the battery cell case.
13. A step of providing a case and a cover, wherein a first edge bend is formed on the peripheral edge of the case, a second edge bend is formed on the peripheral edge of the cover, the first edge bend and the second edge bend are planar and can be superimposed on each other, The steps include forming a winding structure by winding the first edge bending portion and the second edge bending portion, A step of forming a wrinkle structure by bending the first edge bending portion and the second edge bending portion, wherein the wrinkle structure is located between the winding structure and the peripheral edges of the case and the cover, A method for manufacturing a battery cell case, comprising the step of bending the first edge bend portion and the second edge bend portion, which are flat, in the same direction to form the folded projection of the wrinkle structure.
14. In the step of providing the case and cover, an extension is formed on the outer periphery of the first edge bend, and the extension is perpendicular to each other with respect to the first edge bend and the second edge bend, which are planar. The step of winding the first edge bent portion and the second edge bent portion to form a winding structure is, The steps include bending the extended portion and overlapping it with the second edge bend portion on the side opposite to the first edge bend portion, The steps include: bending the overlapping extension portion, the first edge bend portion, and the second edge bend portion toward the side where the extension portion is located to form an arc portion on the periphery of the overlapping extension portion, the first edge bend portion, and the second edge bend portion; A method for manufacturing a battery cell case according to claim 13, comprising the steps of winding the extension portion, the first edge bend portion, and a part of the second edge bend portion that form the arc portion toward the side where the extension portion is located, and flattening the arc portion during the winding process so that the extension portion, the first edge bend portion, and a part of the second edge bend portion overlap the unwinding portion of the first edge bend portion and the second edge bend portion which are planar.
15. The wrinkle structure includes at least one folding projection, In the step of providing the case and cover, the second edge bending portion has a contact portion and a wrinkled portion that constitute the bending projection, The step of bending the first edge bend portion and the second edge bend portion to form a wrinkled structure is: The process includes the steps of bending the first edge bend portion in a direction approaching the contact portion, and bringing the portion formed as the bent projection by bending the first edge bend portion into contact with the contact portion, The method for manufacturing a battery cell case according to claim 14, wherein the wrinkled portion protrudes in a direction away from the portion formed as the bent projection by the bending of the first edge bending portion.

Description

This application claims priority to Chinese Patent Application No. 202310171631.9, entitled "Battery Cell Case and Method for Manufacturing the Same," filed with the China National Intellectual Property Office on February 27, 2023, and all its contents are incorporated herein by reference. This application relates to the battery technology field, and more particularly to a battery cell case and a method for manufacturing the same. In recent years, with the increase in sales of new energy vehicles, the market demand for drive batteries has been steadily rising. Drive batteries can generally be classified into cylindrical batteries, prismatic batteries, and softpack batteries based on their form. Cylindrical batteries have a metal shell, usually made of aluminum or steel, and are generally sealed by laser welding, while softpack batteries are packaged in aluminum-plastic film and are generally sealed by a high-temperature sealing process. Rectangular batteries have a metal shell and are sealed primarily by laser welding. Specifically, a cover plate is inserted into the top opening of the shell to make it flush, and then the rectangular gap between the cover plate and the shell is welded and sealed by repeated continuous oscillations. Depending on the location of the weld seam, the sealing process can be further divided into two types: top welding and side welding. Laser welding of aluminum shells is difficult and can cause problems such as surface bulging, pores, sparks, and internal bubbles, resulting in high demands on materials and the welding process. In the side welding process, bulging can occur and affect subsequent assembly, so there are high demands on the stability of the laser device, the cleanliness of the material, and the fit gap between the top cover and the shell. In the top welding process, problems are likely to occur if the welding position is not on a flat surface, so there are high demands on the insertion and positioning of the cover plate into the shell, and a high degree of automation of the equipment is required. Therefore, there is an urgent need for sealing structures and methods that can avoid the above-mentioned problems that occur in the welding process. This is a partial cross-sectional view of a battery cell case provided by an embodiment of the present invention.Figure 1 shows an enlarged view of the winding structure and wrinkle structure.This is a partial cross-sectional view of the battery cell case in Figure 1 before the winding and wrinkled structures are formed.This is another partial cross-sectional view of a battery cell case provided by an embodiment of the present invention.Figure 4 shows enlarged views of the winding structure and wrinkled structure.This is a partial cross-sectional view of the battery cell case in Figure 4 before the winding and wrinkled structures are formed.This is an enlarged view showing the winding structure in Figure 2 with a sealing layer added.Figure 5 is an enlarged view showing the winding structure with a sealing layer added.This is a partial cross-sectional view of the battery cell case shown in Figure 7A or Figure 7B before the winding structure and wrinkle structure are formed.This is a partial cross-sectional view of a battery cell case at the completion of step S101 of the method for manufacturing a battery cell case provided by an embodiment of the present invention.This is a partial cross-sectional view of a battery cell case at the completion of step S102 of the method for manufacturing a battery cell case provided by an embodiment of the present invention.This is a partial cross-sectional view of a battery cell case at the completion of step S103 of the method for manufacturing a battery cell case provided by an embodiment of the present invention.This is a partial cross-sectional view of a battery cell case at the completion of step S104 of the method for manufacturing a battery cell case provided by an embodiment of the present invention.This is a partial cross-sectional view of a battery cell case at the completion of step S105 of the method for manufacturing a battery cell case provided by an embodiment of the present invention.This is a partial cross-sectional view of a battery cell case at the completion of step S106 of the method for manufacturing a battery cell case provided by an embodiment of the present invention.This is a partial cross-sectional view of a battery cell case at the completion of step S107 of the method for manufacturing a battery cell case provided by an embodiment of the present invention.This is a partial cross-sectional view of a battery cell case at the completion of step S108 of the method for manufacturing a battery cell case provided by an embodiment of the present invention. To further clarify the object, technical solution, and advantages of the present invention, the invention will be described in more detail below with reference to the accompanying drawings. Naturally, the embodiments descri