Central needle and lithium battery

Abstract

The utility model relates to the technical field of lithium batteries, in particular to a center needle and a lithium battery, the center needle comprises a rod body and a flange plate body, one end of the rod body close to a cap body of the lithium battery forms a first end, and the port part of the first end of the rod body is turned outwards along the radial direction to form an assembly edge. The flange plate body is assembled at the first end of the rod body, the inner diameter position of the flange plate body is folded towards the second end of the rod body to form a clamping ring, the clamping ring comprises a plurality of clamping teeth distributed at intervals, and during assembling, the flange plate body moves to the first end from the second end of the rod body until the clamping ring is tightly attached to the assembling edge, and then the clamping teeth are clamped to the first end of the rod body. The clamping teeth of the clamping ring are engaged with the outer wall of the rod body to form interference fit. The technical problem that in the prior art, a center pin which is thin in size, high in height and provided with a flange plane is not easy to produce is solved.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery technology, specifically to a center pin and a lithium battery. Background Technology

[0002] The center pin of a lithium battery plays a crucial role in both safety protection and manufacturing processes. In thermal runaway scenarios, its structural design directly affects the battery's explosion-proof performance. During manufacturing, the geometry and material selection of the center pin determine the precision and reliability of the battery cell. Currently, center pins are thin, tall, and have flange planes. Forming this structure using a one-piece stamping process presents certain difficulties and is not easy to achieve. Summary of the Invention

[0003] To address the technical problem of manufacturing thin, tall center pins with flanged surfaces in the prior art, this application proposes a center pin and a lithium battery, which solves the aforementioned technical problems.

[0004] The technical solution adopted by this utility model to solve its technical problem is:

[0005] This utility model provides a center pin, comprising: a rod body, one end of which near the cap of a lithium battery is formed as a first end, and the port portion of the first end of the rod body is radially outward to form an assembly edge; a flange body, which is assembled to the first end of the rod body, and the inner diameter of the flange body is folded towards the second end of the rod body to form a snap ring, the snap ring including a plurality of spaced-apart teeth. During assembly, the flange body moves from the second end of the rod body to the first end until the snap ring is tightly against the assembly edge, and the snap teeth of the snap ring engage with the outer wall of the rod body to form an interference fit.

[0006] Furthermore, the teeth of the snap ring are tilted towards the center so that the teeth have stress that grips the outer wall of the rod.

[0007] Furthermore, the spacing between the teeth extends from the snap ring to the flange face of the flange body.

[0008] Furthermore, the rod is made of metal or plastic.

[0009] Furthermore, the flange body is made of metal.

[0010] Another aspect of this utility model provides a lithium battery, comprising: a housing, one end of which is fitted with a cap; a winding core, which is disposed within the housing; a center pin, which is disposed at the center of the winding core, the flange of the center pin facing the flange surface of the second end of the rod being attached to the winding core; and an elastic plunger, one end of which is attached to the flange of the center pin, the other end of which is attached to the cap and seals the vent hole on the cap.

[0011] Furthermore, the resilient plunger includes a plug cap that closes the vent hole on the cap body, and an elastic element disposed between the plug cap and the flange body.

[0012] Based on the above technical solution, the technical effects that this utility model can achieve are as follows:

[0013] The center pin of this utility model is formed by separately molding the rod body and the flange body, and then assembling the two to form the center pin, thereby avoiding the one-piece stamping process in the prior art and significantly reducing the molding difficulty of the center pin. Specifically, the flange body moves from the second end to the first end of the rod body until the snap ring of the flange body is tightly attached to the assembly edge of the first end of the rod body. The assembly edge can prevent the flange body from coming off the first end of the rod body. After the flange body moves to the predetermined position of the first end of the rod body, the snap teeth of the snap ring of the flange body engage with the outer wall of the rod body so that the flange body and the rod body form an interference fit.

[0014] The lithium battery of this utility model provides a specific implementation example of the center pin. After the lithium battery is assembled, one of the two flange faces of the center pin flange body is limited by the core and the other is limited by the assembly edge, which reflects the role of the assembly edge limiting flange body in the lithium battery. On the other hand, the elastic plunger of the lithium battery allows for periodic venting during the use of the lithium battery, thereby greatly extending the service life of the lithium battery. Attached Figure Description

[0015] Figure 1 This is a cross-sectional view of the central needle of this utility model;

[0016] Figure 2 This is a schematic diagram of the overall structure of the central needle of this utility model;

[0017] Figure 3 This is a schematic diagram of the central needle of this utility model from another perspective;

[0018] Figure 4 This is a schematic diagram of the lithium battery of this utility model during venting.

[0019] Figure 5 This is a schematic diagram of the lithium battery of this utility model in the non-venting state.

[0020] In this utility model: 1-rod body, 11-assembly edge; 2-flange body, 21-clamping ring, 211-spacer, 212-clamping tooth; 3-shell, 31-cap body, 311-vent hole; 4-core; 5-elastic plunger, 51-plug cap, 52-elastic element. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0022] like Figure 1-3 As shown, this utility model provides a center pin, including a rod body 1 and a flange body 2. The end of the rod body 1 near the cap body 31 of the lithium battery is formed as a first end. The port portion of the first end of the rod body 1 is radially outward to form an assembly edge 11. The flange body 2 is assembled on the first end of the rod body 1. The inner diameter of the flange body 2 is folded towards the second end of the rod body 1 to form a snap ring 21. The snap ring 21 includes a plurality of snap teeth 212 distributed at intervals 211. During assembly, the flange body 2 moves from the second end to the first end of the rod body 1 until the snap ring 21 is tightly attached to the assembly edge 11. The snap teeth 212 of the snap ring 21 then engage with the outer wall of the rod body 1 to form an interference fit. This demonstrates the function of the interval 211 between the snap teeth 212. The interval 211 allows the snap teeth 212 to deform before assembly is completed, thereby allowing the flange body 2 to move on the rod body 1.

[0023] In one specific embodiment of this utility model, the locking teeth 212 of the locking ring 21 are inclined toward the center so that the locking teeth 212 have stress that bites the outer wall of the rod body 1.

[0024] In one specific embodiment of this utility model, the gap 211 between the locking teeth 212 extends from the locking ring 21 to the flange surface of the flange body 2, thereby making the locking teeth 212 more easily deformable.

[0025] In one specific embodiment of this utility model, the rod 1 is made of metal or plastic.

[0026] In one specific embodiment of this utility model, the flange body 2 is made of metal material.

[0027] like Figure 4-5As shown, this utility model also provides a lithium battery, including a housing 3, a core 4, the aforementioned center pin and elastic plunger 5. One end of the housing 3 is fitted with a cap 31, the core 4 is disposed inside the housing 3, the center pin is disposed at the center of the core 4, the flange 2 of the center pin is attached to the flange surface of the second end of the rod 1 and is attached to the core 4, one end of the elastic plunger 5 is attached to the flange 2 of the center pin, and the other end of the elastic plunger 5 is attached to the cap 31 and closes the vent hole 311 on the cap 31.

[0028] In this utility model of lithium battery, the external force-applying component can push the elastic plunger 5 inward through the vent hole 311 to vent during the use of the lithium battery. After the external force-applying component is removed, the elastic plunger 5 closes the vent hole 311 under its own elastic force to ensure the airtightness of the lithium battery.

[0029] Specifically, the elastic plunger 5 includes a plug 51 that closes the vent hole 311 on the cap body 31, and an elastic element 52 disposed between the plug 51 and the flange body 2. The elastic element 52 may be a spring.

[0030] It should be understood that the specific embodiments described above are only for explaining the present invention and are not intended to limit the present invention. Obvious variations or modifications derived from the spirit of the present invention are still within the protection scope of the present invention.

Claims

1. A central needle, characterized in that include: The rod (1) has a first end formed at one end near the cap (31) of the lithium battery, and the port portion of the first end of the rod (1) is radially outward to form an assembly edge (11); A flange body (2) is assembled at the first end of the rod body (1). The inner diameter of the flange body (2) is folded towards the second end of the rod body (1) to form a snap ring (21). The snap ring (21) includes a plurality of snap teeth (212) distributed at intervals (211). During assembly, the flange body (2) moves from the second end of the rod body (1) to the first end until the snap ring (21) is close to the assembly edge (11). Then, the snap teeth (212) of the snap ring (21) engage with the outer wall of the rod body (1) to form an interference fit.

2. The central needle of claim 1, wherein, The teeth (212) of the snap ring (21) are inclined toward the center so that the teeth (212) have stress that bites the outer wall of the rod (1).

3. The centering needle of claim 1, wherein, The interval (211) between the teeth (212) extends from the snap ring (21) to the flange face of the flange body (2).

4. The centering needle of claim 1, wherein, The rod (1) is made of metal or plastic.

5. The centering needle of claim 1, wherein, The flange body (2) is made of metal.

6. A lithium battery, characterized by include: A housing (3), one end of which is fitted with a cap (31); Core (4), the core (4) being disposed within the housing (3); The center pin as described in any one of claims 1-5 is disposed at the center of the core (4), and the flange face of the center pin facing the second end of the rod (1) is attached to the core (4). An elastic plunger (5) is attached to the flange body (2) of the center needle at one end and to the cap body (31) at the other end, thereby sealing the vent hole (311) on the cap body (31).

7. The lithium battery of claim 6, wherein, The resilient plunger (5) includes a plug (51) that closes the vent hole (311) on the cap (31) and an elastic element (52) disposed between the plug (51) and the flange body (2).

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