Square steel shell and square steel shell battery
By setting a limiting structure on the first shell and the second shell of the square steel shell battery, accurate positioning and welding are achieved, the problem of poor welding is solved, and the reliability and flatness of welding are improved.
Patent Information
- Application Number
- CN202422545192.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-21
- Publication Date
- 2025-09-26
- Estimated Expiration
- 2034-10-21
AI Technical Summary
In the prior art, high positioning accuracy is required when welding the cover plate and the shell of square steel shell batteries, which leads to poor welding and leakage problems, making it difficult to ensure the reliability and pass rate of welding.
The design of the first shell and the second shell is adopted, and the first limiting structure and the second limiting structure are respectively set at the opening. Accurate positioning is achieved through fitting and welding to ensure the flatness and welding reliability of the steel shell.
The welding reliability of the steel shell is improved, deformation is reduced, flatness requirements are met, and the welding qualification rate is improved.
Smart Images
Figure CN223390637U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of battery technology, and in particular to a square steel shell and a square steel shell battery. Background Art
[0002] Prismatic steel-cased batteries are a promising new lithium battery product, offering significant advantages in safety, stability, energy density, and customized production. They are widely used in power tools, home appliances, smart homes, security, and electric vehicles. Welding the steel casing of prismatic steel-cased batteries is a critical step in the assembly process. In related technologies, the steel casing of a prismatic steel-cased battery consists of a housing and a cover. During assembly, the battery cell is first placed within the housing, then the cover is attached to the housing, and the cover and housing are sealed and welded together.
[0003] However, in the related art, when welding the cover plate and the shell, the positioning accuracy of the shell and the cover plate is required to be high. A slight deviation in the positioning of the shell and the cover will cause poor welding and leakage, so it is difficult to ensure the reliability and pass rate of welding. Utility Model Content
[0004] In order to solve or partially solve the problems existing in the related art, the present application provides a square steel shell and a square steel shell battery, which can improve the welding reliability of the steel shell.
[0005] A first aspect of the present application provides a square steel shell, comprising: a first shell and a second shell, wherein the first shell has a first opening and a first limiting structure arranged along an edge of the first opening, and the second shell has a second opening and a second limiting structure arranged along an edge of the second opening;
[0006] The first limiting structure and the second limiting structure are embedded in each other, and the first limiting structure and the second limiting structure are welded together, so that the first shell and the second shell are enclosed to form an accommodating cavity for accommodating the battery cell.
[0007] Furthermore, the first limiting structure is a first step structure, and the second limiting structure is a second step structure that matches the first step structure.
[0008] Furthermore, the first limiting structure and the second limiting structure are both ring-shaped.
[0009] Furthermore, the first shell and the second shell are arranged along the length direction of the battery core.
[0010] Furthermore, the first shell and the second shell are arranged along the thickness direction of the battery core.
[0011] Furthermore, the first shell and the second shell are arranged along the width direction of the battery cell.
[0012] Furthermore, the sum of the wall thickness of the first shell, the wall thickness of the second shell, and the thickness of the first limiting structure and the second limiting structure at the interlocking portion is the same.
[0013] Furthermore, a first through hole is provided on the first shell, a positive electrode post is provided in the first through hole, the first shell is insulated and connected to the positive electrode post, the positive electrode post is used to be electrically connected to the positive electrode ear of the battery cell, and the first shell is used to be electrically connected to the negative electrode ear of the battery cell.
[0014] A second aspect of the present application provides a square steel-cased battery, comprising: a battery cell and a square steel casing as described in any one of the above items, wherein the battery cell is located in the accommodating cavity.
[0015] Furthermore, the battery cell is a laminated battery cell.
[0016] The technical solution provided in the present application may include the following beneficial effects: by setting a first limiting structure at the first opening of the first shell and a second limiting structure at the second opening of the second shell, the first limiting structure and the second limiting structure are interlocked to facilitate accurate positioning of the first shell and the second shell. Compared with the square steel shell using a cover plate and a shell, the first shell and the second shell of the above-mentioned square steel shell are not prone to deviation during positioning and are easier to accurately position, thereby improving the welding reliability of the first shell and the second shell.
[0017] The cover plate in the related art is relatively thin, and is easily deformed after being welded to the shell, which can easily cause the flatness of the steel shell to not meet the standard. The above-mentioned square steel shell with a first shell and a second shell is welded with two shells, which is not easy to deform and can ensure the flatness requirements of the steel shell.
[0018] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] The above and other objects, features and advantages of the present application will become more apparent by describing in more detail exemplary embodiments of the present application in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the present application.
[0020] Figure 1 This is a schematic structural diagram of a square steel shell battery shown in Example 1 of the present application;
[0021] Figure 2 This is an exploded schematic diagram of the square steel shell battery shown in Example 1 of the present application;
[0022] Figure 31 is a schematic cross-sectional view of a square steel-shell battery shown in Example 1 of the present application;
[0023] Figure 4 is a structural schematic diagram of the first shell shown in Example 1 of the present application;
[0024] Figure 5 is a structural schematic diagram of the second housing shown in the first embodiment of the present application;
[0025] Figure 6 This is a schematic structural diagram of a square steel shell battery shown in Example 2 of the present application;
[0026] Figure 7 This is an exploded schematic diagram of a square steel-shell battery shown in Example 2 of the present application;
[0027] Figure 8 1 is a schematic cross-sectional view of a square steel-shell battery shown in Example 2 of the present application;
[0028] Figure 9 is a structural schematic diagram of the first housing shown in the second embodiment of the present application;
[0029] Figure 10 It is a structural schematic diagram of the second shell shown in Example 2 of the present application.
[0030] Reference numerals:
[0031] 1-first housing, 11-first opening, 12-first limiting structure, 13-first through hole,
[0032] 2-second shell, 21-second opening, 22-second limiting structure,
[0033] 3-battery cells,
[0034] 4- Accommodation cavity,
[0035] 5- positive pole,
[0036] 6- Second through hole,
[0037] 7-Sealing plug. DETAILED DESCRIPTION
[0038] The following describes embodiments of the present application in more detail with reference to the accompanying drawings. Although the accompanying drawings illustrate embodiments of the present application, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. Rather, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.
[0039] It should be understood that although the terms "first", "second", "third", etc. may be used in this application to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.
[0040] In the description of this application, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.
[0041] Unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," and the like should be interpreted broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.
[0042] The technical solutions of the embodiments of the present application are described in detail below with reference to the accompanying drawings.
[0043] Example 1
[0044] like Figures 1 to 5 As shown, embodiment 1 of the present application provides a square steel shell battery, including a battery cell 3 and a square steel shell, wherein the square steel shell includes a first shell 1 and a second shell 2, the first shell 1 is provided with a first opening 11 and a first limiting structure 12 arranged along the edge of the first opening 11, and the second shell 2 is provided with a second opening 21 and a second limiting structure 22 arranged along the edge of the second opening 21.
[0045] The first limiting structure 12 and the second limiting structure 22 are embedded and welded together, so that the first shell 1 and the second shell 2 enclose a receiving cavity 4 for receiving the battery cell 3 .
[0046] During welding, the end of the battery cell 3 with the tab can be placed in one of the first shell 1 and the second shell 2 first, and then the other end of the battery cell 3 can be placed in the other of the first shell 1 and the second shell 2. Then, the first limiting structure 12 and the second limiting structure 22 are docked, thereby splicing the first shell 1 and the second shell 2 together, and the first limiting structure 12 and the second limiting structure 22 can be welded by laser welding.
[0047] By setting a first limiting structure 12 at the first opening 11 of the first shell 1 and a second limiting structure 22 at the second opening 21 of the second shell 2, the first limiting structure 12 and the second limiting structure 22 are engaged with each other to facilitate accurate positioning of the first shell 1 and the second shell 2. Compared with the square steel shell using a cover plate and a shell, the first shell 1 and the second shell 2 of the square steel shell are not prone to deviation during positioning and are easier to accurately position, thereby improving the welding reliability of the first shell 1 and the second shell 2.
[0048] In addition, the cover plate in the related art is relatively thin, and the cover plate is easily deformed after being welded to the shell, which can easily cause the flatness of the steel shell to fail to meet the standard. In this embodiment, the square steel shell having the first shell 1 and the second shell 2 is welded by two shells, which is not easy to deform and can ensure the flatness requirements of the steel shell.
[0049] In some embodiments, as Figure 4 and Figure 5 As shown, the first limiting structure 12 is a first step structure, and the second limiting structure 22 is a second step structure that matches the first step structure. Specifically, the shapes of the first limiting structure 12 and the second limiting structure 22 match, so that the first shell 1 and the second shell 2 are plugged in during docking. After docking, the outer surfaces of the first shell 1 and the second shell 2 remain in a planar state at the docking point, so that the overall side wall of the square steel shell is flat. Among them, the second step structure is inserted into the first step structure during docking, and the first step structure is sleeved on the second step structure. The first step structure is formed by removing material from the inner surface of the side wall of the first shell 1, and the second step structure is formed by removing material from the outer surface of the side wall of the second shell 2. In some other embodiments, the first step structure can also be inserted into the second step structure, so that the second step structure is sleeved on the first step structure.
[0050] In some embodiments, both the first retaining structure 12 and the second retaining structure 22 are annular. That is, the first retaining structure 12 surrounds the first opening 11 of the first housing 1, and the second retaining structure 22 surrounds the second opening 21 of the second housing 2. During laser welding, the first and second retaining structures 12 and 22 are encircled to form a seal. The annular first and second retaining structures 12 and 22 facilitate positioning of the first and second housings 1 and 2 during docking.
[0051] In some embodiments, as Figures 1 to 4 As shown, the first shell 1 is provided with a first through-hole 13, which is provided with a positive electrode post 5. The first shell 1 is insulated from the positive electrode post 5. The positive electrode post 5 is used to electrically connect to the positive tab of the battery cell 3, and the first shell 1 is used to electrically connect to the negative tab of the battery cell 3. Specifically, the battery cell 3 with the bent tab is laser welded to the first shell 1. A PFA insulating sheet can be provided on the positive electrode post 5 for insulation, and the surface of the positive tab is adhered with insulating tape to prevent short circuits caused by contact between the positive tab and the first shell 1. During tab welding, the battery cell 3 is pushed to contact the positive tab with the positive electrode post 5 and the negative tab with the first shell 1. Laser light is then applied from the outside of the first shell 1 to the positive electrode post 5 and the first shell 1 for shell-in welding. The first shell 1 with the battery cell 3 is then welded to the second shell 2. The battery cell 3 can be a laminated battery cell.
[0052] In some embodiments, a second through hole 6 is provided on the first shell 1 or the second shell 2, and a sealing plug 7 is provided on the second through hole 6. Figures 1 to 5 As shown, in this embodiment, a second through hole 6 is provided on the first shell 1. The second through hole 6 serves as a liquid injection hole for injecting liquid into the square steel shell through the second through hole 6. The second through hole 6 is sealed with a sealing plug 7 after liquid injection. The sealing plug 7 is removed after formation to exhaust gas. A circular stainless steel sheet is welded on the second through hole 6 by laser welding to seal the second through hole 6.
[0053] In some embodiments, as Figures 1 to 5 As shown, the first shell 1 and the second shell 2 are arranged along the length direction of the battery cell 3. The length direction of the battery cell 3 is the front-to-back direction of the battery cell 3. The end of the battery cell 3 with the tab is the front end of the battery cell 3, and the other end opposite is the rear end of the battery cell 3. The first shell 1 is close to the front end of the battery cell 3, and the second shell 2 is close to the rear end of the battery cell 3.
[0054] In some embodiments, the wall thickness of the first shell 1, the wall thickness of the second shell 2, and the sum of the thicknesses of the first limiting structure 12 and the second limiting structure 22 at the interlocking position are the same, that is, the wall thicknesses of the first shell 1 and the second shell 2 are the same, and the thickness of the interlocking position of the first limiting structure 12 and the second limiting structure 22 is the same as the wall thickness of the first shell 1 and the second shell 2, so that the overall wall thickness of the square steel shell remains consistent.
[0055] Example 2
[0056] like Figures 6 to 10 As shown, this embodiment provides another square steel shell battery, which differs from the first embodiment only in that the first shell 1 and the second shell 2 are arranged along the thickness direction of the battery cell 3. Figures 6 to 8As shown, the thickness direction of the battery cell 3 is the up-down direction shown in the figure, the first shell 1 is located below the second shell 2, the first opening 11 is located at the upper end of the first shell 1, the second opening 21 is located at the lower end of the second shell 2, and the second shell 2 covers the first shell 1 downwardly.
[0057] In some other embodiments, the first shell 1 and the second shell 2 may also be arranged along the width direction of the battery cell 3 , where the width direction of the battery cell 3 is perpendicular to the thickness direction and the length direction of the battery cell 3 .
[0058] The scheme of the present application has been described in detail above with reference to the accompanying drawings. In the above embodiments, the descriptions of each embodiment have their own emphasis. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments. Those skilled in the art should also be aware that the actions and modules involved in the description are not necessarily required for this application. In addition, it is understood that the steps in the method of the embodiment of the present application can be adjusted in sequence, merged and deleted according to actual needs, and the modules in the device of the embodiment of the present application can be merged, divided and deleted according to actual needs.
[0059] The embodiments of the present application have been described above. The above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is selected to best explain the principles of the embodiments, their practical applications, or improvements to the technology in the market, or to enable other persons skilled in the art to understand the embodiments disclosed herein.
Claims
1. A square steel shell, characterized in that: include: A first shell (1) and a second shell (2), wherein the first shell (1) is provided with a first opening (11) and a first limiting structure (12) arranged along an edge of the first opening (11), and the second shell (2) is provided with a second opening (21) and a second limiting structure (22) arranged along an edge of the second opening (21); The first limiting structure (12) and the second limiting structure (22) are engaged with each other, and the first limiting structure (12) and the second limiting structure (22) are welded together, so that the first shell (1) and the second shell (2) enclose to form a receiving cavity (4) for receiving the battery cell (3).
2. The square steel shell according to claim 1, characterized in that: The first limiting structure (12) is a first step structure, and the second limiting structure (22) is a second step structure that matches the first step structure.
3. The square steel shell according to claim 1, characterized in that: The first limiting structure (12) and the second limiting structure (22) are both ring-shaped.
4. The square steel shell according to claim 1, characterized in that: The first shell (1) and the second shell (2) are arranged along the length direction of the battery core (3).
5. The square steel shell according to claim 1, characterized in that: The first shell (1) and the second shell (2) are arranged along the thickness direction of the battery core (3).
6. The square steel shell according to claim 1, characterized in that: The first shell (1) and the second shell (2) are arranged along the width direction of the battery core (3).
7. The square steel shell according to claim 1, characterized in that: The sum of the wall thickness of the first shell (1), the wall thickness of the second shell (2), and the thickness of the first limiting structure (12) and the second limiting structure (22) at the interlocking portion is the same.
8. The square steel shell according to claim 1, characterized in that: The first shell (1) is provided with a first through hole (13), a positive pole (5) is provided in the first through hole (13), the first shell (1) is insulated and connected to the positive pole (5), the positive pole (5) is used to be electrically connected to the positive electrode ear of the battery cell (3), and the first shell (1) is used to be electrically connected to the negative electrode ear of the battery cell (3).
9. A square steel shell battery, characterized in that: include: A battery core (3) and a square steel shell according to any one of claims 1 to 8, wherein the battery core (3) is located in the accommodating cavity (4).
10. The square steel shell battery according to claim 9, characterized in that: The battery core (3) is a laminated battery core.