Battery cap and battery

Abstract

The utility model discloses a battery cap and battery, the battery cap includes: cap body, the first through -hole is seted up in the cap body middle, connecting assembly, connecting assembly with the cap body insulation is connected, the connecting assembly includes first connecting piece and second connecting piece, first connecting piece with second connecting piece are arranged respectively in the both sides of cap body, and first connecting piece passes through first through -hole with second connecting piece and carries out electricity connection, the battery cap has solved the problem that the traditional cap welds small, has guaranteed the high -efficient stability of battery internal charge transmission.

Description

Technical Field

[0001] This utility model relates to the field of batteries, and in particular to a battery cap and a battery. Background Technology

[0002] With the development of micro-battery technology, battery diameters are decreasing daily, leading to the increasingly widespread application of micro-batteries such as needle-type batteries. However, the miniaturization of battery diameter presents significant technical challenges to the structural design of traditional battery caps. Specifically, the reduced diameter of the battery results in a corresponding reduction in the welding area between the battery cap, the core tabs, and the pack structure, leading to an excessively small welding interface. This limited welding area easily causes problems such as insufficient welding strength, unstable welding, or incomplete welds, thereby affecting the electrical connection reliability and mechanical stability of the battery. Furthermore, during battery operation, factors such as vibration or temperature changes can cause stress concentration at the welded areas, leading to cracks or detachment, further reducing battery performance and lifespan.

[0003] Therefore, there is an urgent need for a new cap structure suitable for micro batteries to solve the connection reliability problem caused by insufficient welding area of ​​traditional battery caps under miniaturization conditions. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a battery cap and a battery.

[0005] The objective of this utility model is achieved through the following technical solution:

[0006] A battery cap, comprising:

[0007] The cap body has a first through hole in the middle;

[0008] A connecting assembly is insulated from the cap body. The connecting assembly includes a first connector and a second connector, which are respectively disposed on both sides of the cap body. The first connector is electrically connected to the second connector through the first through hole.

[0009] In one embodiment, the first connector is provided with a first convex surface, and the second connector is provided with a second convex surface. The first convex surface and the second convex surface are electrically connected after passing through the first through hole.

[0010] In one embodiment, the first convex surface and the second convex surface are electrically connected by welding.

[0011] In one embodiment, the first convex surface and the second convex surface are formed by stamping.

[0012] In one embodiment, the battery cap further includes an insulating component, which includes a first insulating element and a second insulating element. The first connector, the first insulating element, the cap body, the second insulating element and the second connector are stacked sequentially along the thickness direction and are integrally formed by hot pressing.

[0013] In one embodiment, the first insulating member and the second insulating member are respectively provided with a second through hole and a third through hole, both of which have a diameter smaller than the first through hole of the cap body.

[0014] In one embodiment, the outer diameter of the first insulating member is larger than that of the first connector and smaller than that of the cap body, and the outer diameter of the second insulating member is larger than that of the second connector and smaller than that of the cap body.

[0015] This utility model also provides a battery, which includes the battery cap described above.

[0016] In one embodiment, the battery further includes a housing with one open end and a battery core, the housing for housing the battery core, the battery cap for sealing the housing, the first connector being electrically connected to the pack structure, and the second connector being electrically connected to the tabs of the battery core.

[0017] The advantages and beneficial effects of this utility model compared to the prior art are as follows:

[0018] 1. This utility model provides a first connector and a second connector on both sides of the cap body and connects them through a first through hole. Compared with the traditional battery cap pole connection structure, this effectively increases the welding contact area between the battery cap and the tab / pack structure, significantly reduces the risk of incomplete welding or desoldering due to insufficient welding area, and improves the connection stability of the battery under harsh conditions such as vibration and impact.

[0019] 2. By setting up a first insulating component and a second insulating component, and by hot-pressing the connecting component, the insulating component, and the cap body into a single structure, multiple insulation protections are achieved. This effectively prevents the risk of short circuits caused by insulation failure and improves the hermeticity of the encapsulation. At the same time, the layered hot-pressed composite structure makes each component form a whole with uniform mechanical properties, and the rigidity of the cap body is significantly enhanced. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of a battery cap according to one embodiment of the present invention;

[0021] Figure 2 This is an exploded structural diagram of a battery cap according to one embodiment of the present invention.

[0022] Figure 3 This is a schematic diagram of the battery structure according to one embodiment of the present invention;

[0023] The accompanying diagrams are labeled as follows:

[0024] 10. Battery cap; 100. Cap body; 11. First through hole; 200. Connecting assembly; 210. First connector; 220. Second connector; 211. First convex surface; 221. Second convex surface; 300. Insulating assembly; 310. First insulating component; 311. Second through hole; 320. Second insulating component; 321. Third through hole; 20. Housing; 30. Battery core. Detailed Implementation

[0025] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of this utility model. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0026] Please see Figure 1 and Figure 2 A battery cap 10, comprising:

[0027] The cap body 100 has a first through hole 110 in the middle; the connecting component 200 is insulated from the cap body 100 and includes a first connector 210 and a second connector 220. The first connector 210 and the second connector 220 are respectively disposed on both sides of the cap body 100, and the first connector 210 is electrically connected to the second connector 220 through the first through hole 110.

[0028] Among them, the cap body 100 is provided with a first through hole 110 in the middle, and the first connecting member 210 and the second connecting member 220 are arranged on both sides in cooperation to form a three-layer conductive structure in the shape of a "worker". One side of the first connecting member 210 away from the cap body 100 is used for electrical connection with the pack structural member, enabling the battery to stably output electrical energy to the external circuit or receive charging electrical energy from the external circuit. At the same time, the other side of the first connecting member 210 is electrically connected to the second connecting member 220 passing through the first through hole 110, and tight contact can be achieved between the two by means such as crimping, welding or conductive adhesive bonding to form a good conductive path. One side of the second connecting member 220 away from the first connecting member 210 is used for tightly connecting with the battery core lug. Through advanced welding processes such as laser welding and resistance welding, it is ensured that a low-resistance and high-strength electrical connection is formed between the two, ensuring that the internal charge of the battery can be efficiently transmitted from the core lug to the first connecting member 210. The battery cap 10 provided by the present utility model, with its unique structure and reliable connection, greatly improves the connection stability between the battery cap 10, the core lug and the pack structural member in the scenario of small-diameter batteries, solves the problem of small welding area of the traditional cap, ensures the efficient and stable transmission of the internal charge of the battery, and provides strong support for the safe and reliable application of small-diameter batteries in electronic devices.

[0029] Please refer to Figure 1 and Figure 2 In one embodiment, the first connecting member 210 is provided with a first convex surface 211, the second connecting member 220 is provided with a second convex surface 221, and the first convex surface 211 and the second convex surface 221 are electrically connected after passing through the first through hole 110 respectively.

[0030] It should be noted that convex surface structures are respectively arranged on the connecting members. Firstly, the convex surface structures can increase the connection area between the first connecting member 210 and the second connecting member 220 and perform pre-compression to improve the connection stability. Secondly, the convex surface structures have a guiding effect, enabling the first connecting member 210 and the second connecting member 220 to quickly pass through the first through hole 110 for alignment connection and improving the assembly speed.

[0031] In one embodiment, the first convex surface 211 and the second convex surface 221 are electrically connected by welding. For example, electrical conduction can be achieved through strong connection methods such as resistance welding, laser welding, and ultrasonic welding.

[0032] In one embodiment, the first convex surface 211 and the second convex surface 221 are respectively formed by stamping.

[0033] It should be noted that, taking advantage of the fact that the first connector 210 and the second connector 220 are made of metal, in the stamping process, the metal sheet undergoes controllable plastic deformation under the action of the mold, precisely forming the first convex surface 211 and the second convex surface 221. Importantly, the stamping process does not add extra structural weight to the first connector 210 and the second connector 220, thus meeting the requirements for lightweight design. Furthermore, the stamping process has advantages such as fast production cycle, simple equipment, and low cost.

[0034] Please see Figure 1 In one embodiment, the outer diameter of the first connector 210 and the second connector 220 is not less than 1 / 2 of the outer diameter of the cap body 100.

[0035] Thus, by ensuring sufficient welding area, the welding stability between the first connector 210 and the pack structure, and between the second connector 220 and the core electrode lug, is guaranteed.

[0036] Meanwhile, the outer diameter of the second connector 220 should be smaller than the inner diameter of the housing to ensure the smooth assembly of the second connector 220. The outer diameter of the first connector 210 should be smaller than the outer diameter of the cap body 100 to ensure that the overall specifications and model of the battery do not exceed the standard.

[0037] Please see Figure 1 In one embodiment, the battery cap 10 further includes an insulating component 300, which includes a first insulating element 310 and a second insulating element 320. The first connector 210, the first insulating element 310, the cap body 100, the second insulating element 320 and the second connector 220 are stacked sequentially along the thickness direction and are integrally formed by hot pressing.

[0038] It should be noted that the battery cap 10 adopts a five-layer composite structure, integrating the positive and negative connectors, double insulation layers, and the cap body through a hot-pressing process. The insulation components are made of insulating polymer materials, which melt and fill the gaps between the layers during hot pressing, forming a double insulation barrier and a sealed structure. This completely eliminates the risk of short circuits between the positive and negative electrodes and the risk of leakage, while significantly improving structural strength. Under the premise of ensuring electrical safety, this significantly improves the battery's space utilization and energy density.

[0039] Please see Figure 1 and 2 In one embodiment, the first insulating member 310 and the second insulating member 320 are respectively provided with a second through hole 311 and a third through hole 321, both of which have a diameter smaller than the first through hole 110 of the cap body 100.

[0040] It should be noted that, for the circular cap structure of the cylindrical battery, both the first insulating component 310 and the second insulating component 320 are designed as annular sheet-like members, with the diameter of their central through-hole matching the convex surface size of the corresponding connector. Both the first insulating component 310 and the second insulating component 320 are made of insulating polymer resin material. In the assembly process, the first convex surface 211 of the first connector 210 passes through the second through-hole 311, and the second convex surface 221 of the second connector 220 passes through the third through-hole 321. Subsequently, the two convex surfaces are precisely aligned and bonded within the first through-hole 110. Through a hot-pressing composite process, the first insulating component 310 and the second insulating component 320 melt and flow in a controlled manner, fully filling the assembly gap between the first convex surface 211, the second convex surface 221, and the cap body 100, forming a dense insulating coating layer. This design controls the flow path of the molten material through the difference in aperture size, effectively isolating the direct contact between the metal connector and the cap body, eliminating the potential short-circuit risk, and ensuring the structural integrity of the cap assembly. It should be noted that, in order to better illustrate the compositional relationship of each component, Figure 1 The state of the first insulating component 310 and the second insulating component 320 after melting is not shown.

[0041] Please see Figure 1 In one embodiment, the outer diameter of the first insulating member 310 is larger than that of the first connecting member 210 and smaller than that of the cap body 100, and the outer diameter of the second insulating member 320 is larger than that of the second connecting member 220 and smaller than that of the cap body 100.

[0042] Thus, the first insulating element 310 extends outward to completely cover the outer edge of the first connector 210, and the second insulating element 320 simultaneously covers the perimeter of the second connector 220. Through the continuous wrapping of insulating material, a complete annular insulating barrier is constructed between the connector and the cap body 100. Combined with the directional flow of molten material in the hot pressing process, full circumferential electrical isolation between the outer edge of the metal connector and the inner wall of the cap body 100 is finally achieved, eliminating the risk of edge creepage.

[0043] Please see Figure 3 This utility model provides a battery 1, which includes a battery cap 10.

[0044] It should be noted that, compared to traditional battery caps, the innovative design of battery cap 10 increases the welding contact area by more than 30%, effectively solving the problems of incomplete welding and detachment caused by insufficient welding area, and significantly enhancing the electrical connection reliability of the battery under extreme conditions such as vibration and impact. It adopts a double-insulation protection structure, using a stacked layout of the first insulating component 310 and the second insulating component 320, combined with a hot-pressing composite process to form an integrated sealed structure of the connecting components, insulating components, and cap body. This stacked hot-pressing composite process creates an integrated structure with uniform mechanical properties for each component, achieving triple electrical insulation protection while increasing the bending stiffness of the cap body by 45% and ensuring the sealing performance of the cap body. This fundamentally eliminates the risk of short circuits caused by insulation failure and the risk of leakage caused by insufficient sealing, comprehensively improving the reliability, safety, and stability of the battery.

[0045] Please see Figure 3 The battery 1 also includes a housing 20 with one end open and a battery core 30. The housing 20 is used to house the battery core 30, and the battery cap 10 is used to seal the housing 20. The first connector 210 is electrically connected to the pack structure, and the second connector 220 is electrically connected to the tabs of the battery core 30.

[0046] It should be noted that the housing 20 is a deep-drawn and stretched cylindrical structure with one open end. The battery core 30 has a first tab and a second tab at both ends. The battery core 30 is housed in the housing 20. The first tab is welded to the bottom of the housing 20, the second tab is welded to the second connector 220, and the battery cap 10 is laser-sealed to the open end of the housing 20. Finally, the pack structure is welded to the first connector 210 as needed. Through the precise fit of the housing, core, and cap, the utilization rate of the axial space inside the battery is optimized, and the energy density of the battery is improved.

[0047] The above embodiments are merely illustrative of several implementations of this utility model, and their descriptions are relatively specific and detailed. However, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A battery cap, characterized in that, include: The cap body has a first through hole in the middle; A connecting assembly is insulated from the cap body. The connecting assembly includes a first connector and a second connector, which are respectively disposed on both sides of the cap body. The first connector is electrically connected to the second connector through the first through hole.

2. The battery cap according to claim 1, characterized in that, The first connector has a first convex surface, and the second connector has a second convex surface. The first convex surface and the second convex surface are electrically connected after passing through the first through hole.

3. The battery cap according to claim 2, characterized in that, The first convex surface and the second convex surface are electrically connected by welding.

4. The battery cap according to claim 2, characterized in that, The first convex surface and the second convex surface are formed by stamping.

5. The battery cap according to claim 1, characterized in that, The outer diameter of the first connector and the second connector is not less than 1 / 2 of the outer diameter of the cap body.

6. The battery cap according to claim 1, characterized in that, The battery cap also includes an insulating component, which includes a first insulating element and a second insulating element. The first connector, the first insulating element, the cap body, the second insulating element and the second connector are stacked sequentially along the thickness direction and are integrally formed by hot pressing.

7. The battery cap according to claim 6, characterized in that, The first insulating component and the second insulating component are respectively provided with a second through hole and a third through hole, both of which have a diameter smaller than the first through hole of the cap body.

8. The battery cap according to claim 6, characterized in that, The outer diameter of the first insulating member is larger than that of the first connecting member and smaller than that of the cap body, and the outer diameter of the second insulating member is larger than that of the second connecting member and smaller than that of the cap body.

9. A battery, characterized in that, The battery includes a battery cap as described in any one of claims 1 to 8.

10. The battery according to claim 9, characterized in that, The battery also includes a housing with one end open and a battery core. The housing is used to house the battery core, and the battery cap is used to seal the housing. The first connector is electrically connected to the pack structure, and the second connector is electrically connected to the tabs of the battery core.

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