Cylindrical battery cover plate with square positive pole structure
By designing a square positive electrode column structure in a cylindrical lithium-ion battery and using a stop-rotation coordination, the problem of battery cell failure caused by rotation of the positive electrode column of the traditional battery is solved, and the service life of the battery is improved.
Patent Information
- Application Number
- CN202421544472.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-02
- Publication Date
- 2025-05-13
- Estimated Expiration
- 2034-07-02
AI Technical Summary
The positive electrode column of traditional cylindrical lithium-ion batteries is prone to rotate due to the lack of rotation limit design, resulting in tearing of the positive electrode ear, which in turn causes the problem of power cell failure.
A cylindrical battery cover plate with a square positive electrode column structure is designed, and by forming a stop-rotation coupling between the positive electrode drain terminal and the stop-rotation hole, the relative movement between the positive electrode drain terminal and the case is restricted, and the positive electrode ear tear is avoided.
It effectively reduces the possibility of battery cell failure due to tearing the positive electrode ear, improves the service life of the cylindrical battery, and fixes the positive electrode drainage terminal by clamping to prevent the positive electrode column from rotating.
Smart Images
Figure CN222867838U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of battery structure design, in particular to a cylindrical battery cover plate with a square positive pole column structure. Background Art
[0002] With the continuous development of the lithium battery industry, there are currently three main types of lithium-ion battery packaging, namely cylindrical, square and soft pack. Different packaging structures mean different characteristics.
[0003] Since the positive pole design of traditional cylindrical batteries is often affected by the rotation of the circular pole, square batteries are often designed with ceramic poles on the substrate for position fixing, but cylindrical batteries have no relevant position limiting design to prevent their rotation. For example, the 46XX cylindrical series, the positive poles of this series of batteries on the market are all circular in design, and there is no rotation limit fixing design, which may cause the positive pole to rotate and cause the current collector to rotate, which in turn causes the positive pole ear welded on the current collector to tear, resulting in battery cell failure, so it needs to be solved urgently. Summary of the invention
[0004] In order to avoid and overcome the technical problems existing in the prior art, the utility model provides a cylindrical battery cover with a square positive pole column structure. The utility model limits the relative movement between the positive drain terminal and the housing through the anti-rotation fit formed between the positive drain terminal and the anti-rotation hole, thereby reducing the possibility of cell failure caused by tearing of the positive pole ear and improving the service life of the cylindrical battery.
[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:
[0006] A cylindrical battery cover plate with a square positive pole column structure comprises a shell with an upper cover and a positive current drain terminal matched with the upper cover, a through-shaped anti-rotation hole is provided at the upper cover, and the positive current drain terminal has a three-section structure with cross sections at both ends larger than the cross section in the middle; when an anti-rotation fit is formed between the middle part of the positive current drain terminal and the anti-rotation hole, two axial shoulders of the positive current drain terminal respectively form a surface fit with the outer wall and the inner wall of the upper cover.
[0007] As a further solution of the utility model: the middle part of the positive electrode current drain terminal is a square shaft structure, the anti-rotation hole is a square hole, and the square hole and the square shaft structure cooperate to form an anti-rotation fit.
[0008] As a further solution of the utility model: the positive current drain terminal includes a positive electrode post and an insulating structure coated on the side circumference of the positive electrode post. The outer shape of the positive electrode post is a three-section structure with cross sections at both ends larger than the cross section in the middle. The middle and upper ends of the positive electrode post are both square structures. The middle part of the positive electrode post cooperates with the insulating structure and the stop hole to form a stop-rotation fit; the insulating structure extends upward from the middle part of the positive electrode post along the outer wall of the positive electrode post until it covers the upper periphery of the positive electrode post, thereby limiting the upper part of the positive electrode post through the insulating structure.
[0009] As a further solution of the utility model: the insulating structure includes an insulating gasket and a sealing ring, which are sequentially sleeved on the side circumference of the positive electrode pole from top to bottom, and the connection between the insulating gasket and the sealing ring is located in the middle section of the positive electrode pole, so that the side circumference of the positive electrode pole is insulated.
[0010] As a further solution of the utility model: the maximum cross-sectional area of the sealing ring is larger than the cross-sectional area of the lower end of the positive electrode current drain terminal.
[0011] As a further solution of the utility model: the insulating ring is an integrated structure including a circular ring disk and at least two wall rings, wall ring one is located in the middle of the lower end surface of the circular ring disk, and is used to further fix the position of the positive electrode collector disk, wall ring two is located at the outer circumference of the circular ring disk, the inner hole wall of the circular ring disk is fitted with the end surface of the sealing ring, and wall ring two and the circular ring disk cooperate with the sealing ring to form an insulating layer between the cavity and the upper cover.
[0012] As a further solution of the utility model: the insulating ring is an integrated structure including a circular ring disk and at least two wall rings, wall ring one is located in the middle of the lower end surface of the circular ring disk, and is used to further fix the position of the positive electrode collector disk, wall ring two is located at the outer circumference of the circular ring disk, the inner hole wall of the circular ring disk is fitted with the end surface of the sealing ring, and wall ring two and the circular ring disk cooperate with the sealing ring to form an insulating layer between the cavity and the upper cover.
[0013] As a further solution of the utility model: the insulating structure is an integrated structure.
[0014] Compared with the prior art, the beneficial effects of the utility model are:
[0015] 1. The utility model limits the relative movement between the positive electrode drainage terminal and the shell through the anti-rotation fit formed between the positive electrode drainage terminal and the anti-rotation hole, thereby reducing the possibility of cell failure caused by tearing of the positive electrode ear and improving the service life of the cylindrical battery.
[0016] 2. The utility model cooperates the square anti-rotation hole with the positive electrode drainage terminal with a square shaft structure in the middle, so that the positive electrode drainage terminal and the shell are fixed by snapping, thereby preventing the positive electrode column from rotating.
[0017] 3. The utility model further achieves relative fixation between the positive electrode drainage terminal and the cover body by fitting the two end portions of the positive electrode drainage terminal with the end surface of the upper cover, thereby further avoiding relative movement between the positive electrode drainage terminal and the cover body to cause cell failure.
[0018] 4. The utility model forms an insulating structure on the side circumference of the positive electrode column by including an insulating gasket and a sealing ring, so that the positive electrode column can only form a conductive channel from the lower end surface to the upper end surface.
[0019] 5. The utility model utilizes the positive pole column and the wall ring on the insulating ring to fix the positive current collector to achieve a better fixation effect of the positive current collector, which greatly reduces the occurrence of cell failure caused by damage or tearing of the positive pole ear due to movement of the positive current collector. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 It is a three-dimensional exploded view of a cylindrical battery cover plate with a square positive pole structure in the utility model.
[0021] Figure 2 for Figure 1 Top view after assembly.
[0022] Figure 3 for Figure 1 Sectional view after assembly.
[0023] Figure 4 for Figure 1 Schematic diagram of the three-dimensional insulating ring.
[0024] Figure 5 for Figure 4 A three-dimensional schematic diagram of the insulating ring from another perspective.
[0025] In the figure:
[0026] 1. Shell; 11. Stop hole; 12. Upper cover; 13. Positive electrode ear; 2. Positive electrode drainage terminal; 21. Positive electrode column; 22. Insulating gasket; 23. Sealing ring; 3. Insulating ring; 31. Circular ring disk; 32. Wall ring 1; 33. Wall ring 2; 4. Positive electrode current collecting disk. DETAILED DESCRIPTION
[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0028] See also Figure 1-Figure 5 In an embodiment of the utility model, a cylindrical battery cover plate with a square positive pole column structure includes a shell 1 with an upper cover 12 and a positive current drain terminal 2 matched with the upper cover 12, a through-shaped anti-rotation hole 11 is opened at the upper cover 12, and the positive pole drain terminal 2 has a three-section structure with cross sections at both ends larger than the cross section in the middle; when a anti-rotation fit is formed between the middle part of the positive pole drain terminal 2 and the anti-rotation hole 11, the two shoulders of the positive pole drain terminal 2 respectively form a surface fit with the outer wall and the inner wall of the upper cover 12; the anti-rotation fit between the anti-rotation hole 11 and the positive pole drain terminal 2 is utilized to limit the rotation of the positive pole drain terminal 2, thereby avoiding the rotation of the positive current collector 4 caused by the rotation of the positive pole column, thereby causing the positive pole ear 13 fixedly connected to the positive current collector 4 to tear, and finally causing the failure of the battery cell, thereby improving the service life of the cylindrical battery.
[0029] The positive current drain terminal 2 includes a positive electrode column 21 and an insulating structure coated on the side circumference of the positive electrode column 21. The positive electrode column 21 has an outer shape of a three-section structure with cross sections at both ends larger than the cross section in the middle. The middle and upper ends of the positive electrode column 21 are both square structures. The middle part of the positive electrode column 21 cooperates with the insulating structure and the stop hole 11 to form a stop fit. The square hole and the square shaft are used to limit the relative movement between the shell 1 and the positive current drain terminal 2 to avoid failure of the battery cell due to the rotation of the positive electrode column 21. The positive current drain terminal 2 includes a positive electrode column 21 and an insulating structure coated on the side circumference of the positive electrode column 21. The positive electrode column 21 has an outer shape of a three-section structure with cross sections at both ends larger than the cross section in the middle. The middle and upper ends of the positive electrode column 21 are both square structures. The middle part of the positive electrode column 21 cooperates with the insulating structure and the stop hole 11 to form a stop fit. The square hole and the square shaft are used to limit the relative movement between the shell 1 and the positive current drain terminal 2 to avoid failure of the battery cell due to rotation of the positive electrode column 21. The hole 11 forms a stop fit; the upper end of the positive electrode column 21 cooperates with the insulating structure to form a stop fit with the outside; the insulating structure extends upward from the middle of the positive electrode column 21 along the outer wall of the positive electrode column 21 until it covers the upper periphery of the positive electrode column 21, thereby limiting the upper part of the positive electrode column 21 through the insulating structure, so that the cylindrical battery can better maintain a relative static state with the external structure during use, and effectively avoid the positive electrode column 21 rotating due to the relative movement between the cylindrical battery and the external structure, resulting in battery cell failure; the maximum cross-sectional area of the sealing ring 23 is larger than the cross-sectional area of the lower end of the positive electrode column 21, and the insulating gasket 22 and the sealing ring 23 make it possible for only the upper end face and the lower end face of the positive electrode column 21 to directly contact and conduct electricity with other structures to prevent leakage and electric shock.
[0030] An insulating ring 3 and a positive current collecting disk 4 are also provided inside the shell 1. The insulating ring 3 is located between the positive current collecting disk 4 and the upper cover 12. The upper end surface of the positive current collecting disk 4 is connected to the lower end surface of the positive pole column 21, and the lower end surface of the positive current collecting disk 4 is connected to the positive pole ear 13 in the shell 1, which is used to form a guide channel and fix the position of the positive current collecting disk 4 to avoid damage or tearing of the positive pole ear 13 due to the movement of the positive current collecting disk 4; the insulating ring 3 is an integrated structure including a circular ring disk 31 and at least two wall rings, and the wall ring 1 32 is located in the middle of the lower end surface of the circular ring disk 31, which is used to further fix the position of the positive current collecting disk 4, and the wall ring 2 32 is located at the outer circumference of the circular ring disk 31, and the inner hole wall of the circular ring disk 31 is in contact with the end surface of the sealing ring 23, and the wall ring 2 33 and the circular ring disk 31 cooperate with the sealing ring 23 to form a connection between the interior of the shell 1 and the interior of the upper cover 12 The insulating layer between the walls covers the inner wall of the upper cover 11 and the lateral surface inside the shell 1 to prevent the cylindrical battery from conducting electricity or leaking electricity from the outside of the upper end surface of the positive electrode column 21, which is safer. At the same time, the insulating ring 3 can also play a certain supporting role for the shell 1 to reduce the possibility of deformation of the shell 1 due to bumps or minor impacts, causing the positive current collector 4 to move, and ultimately leading to failure of the battery cell (it should be noted that the shell 1 is generally made of metal material, which has a certain strength itself, and the battery basically does not produce bumps or collisions during production and use. During normal use, the shell 1 will not be deformed. At the same time, the insulating ring 3, the insulating gasket 22 and the sealing ring 23 are all made of non-conductive materials. This part is the existing technology, and this scheme has not improved it, so it will not be repeated).
[0031] Embodiment 2:
[0032] Different from the above-mentioned embodiment, based on the cylindrical battery cover plate with a square positive electrode column structure in the first embodiment, the second embodiment is improved as follows:
[0033] The middle part of the positive current drain terminal 2 is a square axis structure, and the anti-rotation hole 11 is a square hole. The square hole and the square axis structure cooperate to form a anti-rotation fit; utilizing the formed anti-rotation fit, the shell 1 limits and fixes the positive current drain terminal 2 to avoid rotation of the positive electrode column 21, thereby achieving the effect of protecting the battery cell. In other embodiments, the anti-rotation fit can also be composed of anti-rotation holes 11 of other shapes and the middle part of the positive current drain terminal 2.
[0034] Embodiment three:
[0035] Different from the above-mentioned embodiments, based on the cylindrical battery cover plate with a square positive electrode column structure in the first embodiment, the third embodiment makes the following improvements:
[0036] The insulating structure is an integrated structure, which allows the side surface of the positive electrode column 21 to be wrapped more completely, thereby achieving better insulation effect on the side surface of the positive electrode column 21. In other embodiments, the insulating structure and the insulating ring 3 can also be made integrally to achieve the best insulation effect at the positive end of the cylindrical battery, so as to achieve the best effect of preventing leakage or electric shock.
[0037] Of course, it is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, but also includes the same or similar structures that can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any reference numerals in the claims should not be regarded as limiting the claims involved.
[0038] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.
[0039] The techniques, shapes, and structural parts not described in detail in the present invention are all well-known techniques.
Claims
1. A cylindrical battery cover with a square positive electrode column structure, characterized in that: The invention comprises a housing (1) having an upper cover (12) and a positive electrode current drain terminal (2) matched with the upper cover (12); a through-shaped anti-rotation hole (11) is provided at the upper cover (12); the positive electrode current drain terminal (2) has an outer shape of a three-section structure with cross sections at both ends being larger than the cross section in the middle; when the middle of the positive electrode current drain terminal (2) forms an anti-rotation fit with the anti-rotation hole (11), two axial shoulders of the positive electrode current drain terminal (2) respectively form a surface fit with the outer wall and the inner wall of the upper cover (12).
2. A cylindrical battery cover plate with a square positive electrode column structure according to claim 1, characterized in that: The middle part of the positive electrode current drain terminal (2) is a square shaft structure, the anti-rotation hole (11) is a square hole, and the square hole and the square shaft structure cooperate to form an anti-rotation fit.
3. The cylindrical battery cover plate with a square positive electrode column structure according to claim 1, characterized in that: The positive electrode current drain terminal (2) comprises a positive electrode column (21) and an insulating structure covering the side circumference of the positive electrode column (21). The positive electrode column (21) has a three-section structure with cross sections at both ends larger than the cross section in the middle. The middle and upper ends of the positive electrode column (21) are both square structures. The middle of the positive electrode column (21) cooperates with the insulating structure and the rotation-stopping hole (11) to form a rotation-stopping fit. The insulating structure extends upward from the middle of the positive electrode column (21) along the outer wall of the positive electrode column (21) until it covers the upper outer circumference of the positive electrode column (21), thereby limiting the rotation of the upper part of the positive electrode column (21) through the insulating structure.
4. A cylindrical battery cover plate with a square positive electrode column structure according to claim 3, characterized in that: The insulating structure comprises an insulating gasket (22) and a sealing ring (23), wherein the insulating gasket (22) and the sealing ring (23) are sequentially sleeved on the side circumference of the positive electrode column (21) from top to bottom, and the connection between the insulating gasket (22) and the sealing ring (23) is located in the middle section of the positive electrode column (21), so that the side circumference of the positive electrode column (21) is insulated.
5. A cylindrical battery cover plate with a square positive electrode column structure according to claim 4, characterized in that: The maximum cross-sectional area of the sealing ring (23) is greater than the cross-sectional area of the lower end of the positive electrode current drain terminal (2).
6. A cylindrical battery cover plate with a square positive electrode column structure according to claim 4, characterized in that: An insulating ring (3) and a positive electrode current collecting disc (4) are also provided inside the housing (1); the insulating ring (3) is located between the positive electrode current collecting disc (4) and the upper cover (12); the upper end surface of the positive electrode current collecting disc (4) is connected to the lower end surface of the positive electrode pole (21); and the lower end surface of the positive electrode current collecting disc (4) is connected to the positive electrode ear (13) inside the housing (1), so as to form a flow guide channel and fix the position of the positive electrode current collecting disc (4).
7. A cylindrical battery cover plate with a square positive electrode column structure according to claim 6, characterized in that: The insulating ring (3) is an integral structure comprising a circular ring disk (31) and at least two wall rings. The first wall ring (32) is located at the middle of the lower end surface of the circular ring disk (31) and is used to further fix the position of the positive electrode current collector disk (4). The second wall ring (33) is located at the outer circumference of the circular ring disk (31). The inner hole wall of the circular ring disk (31) is in contact with the end surface of the sealing ring (23). The second wall ring (33) and the circular ring disk (31) cooperate with the sealing ring (23) to form an insulating layer between the cavity and the upper cover (12).
8. The cylindrical battery cover plate with a square positive electrode column structure according to claim 3, characterized in that: The insulation structure is an integrated structure.