Battery with high-safety packaging structure

Abstract

The utility model provides a battery with a high-safety packaging structure, which comprises a battery cell body and an outer shell used for wrapping the battery cell body, one end of the battery cell body is also provided with a positive pole bus bar and a cap body, the cap body is provided with a sealing groove structure, the sealing groove structure is provided with an insulating sealing rubber ring, and the insulating sealing rubber ring is provided with a positive pole bus bar and a negative pole bus bar. The insulating sealing rubber ring is located between the cap body and the outer shell, the inner edge of the insulating sealing rubber ring and the cap body are in tight press fit, the cap body is further provided with a liquid injection hole structure, and a sealing piece is arranged in the liquid injection hole structure. And the phenomena of spontaneous combustion, explosion and the like caused by overheating and overlarge internal pressure of the battery are effectively prevented. The structure is exquisite, the number of production procedures is small, large-scale production is facilitated, cost is reduced, and therefore great economic value and practical value are achieved.

Description

Technical Field

[0001] This utility model relates to the field of battery production, research and development, and design technology, and in particular to a battery with a high-safety packaging structure. Background Technology

[0002] With the continuous development of science and technology, and the growth of emerging industries such as electric vehicles, electric bicycles, drones, robots, mobile energy storage, and power tools, the application range of power batteries is becoming increasingly wide. The industry is moving towards smaller size, higher performance, and greater economy. Currently, the industry commonly uses steel cap components and steel shell roll forming technology for battery structures. The basic structure is as follows: Figure 1 As shown, there are currently two types of explosion-proof cylindrical batteries: those with pressure relief devices and those without. Batteries without pressure relief devices are mainly used in small batteries. Without these devices, gas generated by the battery cannot be released through the pressure relief mechanism, resulting in low safety performance. In cases of large capacity or extreme conditions, there is a risk of battery explosion. This type is only suitable for batteries with low venting and small capacity, limiting its application. The other type has pressure relief devices, but these devices are complex in structure, difficult to manufacture, and have low production efficiency, hindering mass production. In summary, current battery packaging technology is complex in structure, difficult to manufacture, inefficient, and costly, which is detrimental to mass production. This has a negative impact on the widespread application of batteries. Therefore, further improvements are needed. Utility Model Content

[0003] This invention addresses the shortcomings of the prior art by providing a battery with a compact structure, high safety, and a high-safety packaging structure that is suitable for mass production.

[0004] The technical solution adopted by this utility model to solve the above problems is as follows:

[0005] This utility model provides a battery with a high-safety packaging structure, including a cell body and an outer shell for covering the cell body, and a positive electrode busbar and a cap body are provided at one end of the cell body.

[0006] Furthermore, the cap body is provided with a sealing groove structure, and an insulating sealing ring is provided on the sealing groove structure. The insulating sealing ring is located between the cap body and the outer shell body, and the inner edge of the insulating sealing ring is tightly pressed against the cap body.

[0007] Furthermore, the cap body is also provided with an injection hole structure, and the injection hole structure is provided with a sealing element. The cross-sectional shape of the injection hole structure includes a conical shape.

[0008] Furthermore, the side of the closure includes a straight side and a beveled side.

[0009] The inner wall of the injection hole structure is a beveled hole wall.

[0010] The injection hole structure also has a welding position on one side.

[0011] The sealing member is pressed into the injection hole structure, and the inclined hole wall of the injection hole structure is sealed with the inclined and straight sides of the sealing member through an interference fit. The sealing member is tightly fixed to the injection hole structure by laser welding at the welding position.

[0012] Furthermore, the cap body is also provided with a pressure relief and explosion-proof sink.

[0013] Furthermore, the bottom plane of the pressure relief and explosion-proof sink is provided with an annular groove. The cross-section of the annular groove includes a trapezoid. By adjusting the cross-sectional dimension parameters of the annular groove, the peak pressure of the battery can be determined to prevent the battery from spontaneously combusting or exploding.

[0014] Furthermore, a plastic gasket is provided on the positive electrode busbar, one end of the positive electrode busbar is connected to the battery cell body, and the other end is welded to the cap body.

[0015] Furthermore, the insulating sealing ring has a groove structure for fixing around the periphery of the cap body.

[0016] This utility model also provides a method for producing a battery with a high-safety packaging structure, comprising the following steps:

[0017] S1: Weld one end of the positive busbar to the cap body for fixation.

[0018] S2: The battery cell is inserted into the outer casing, and the outer casing is rolled and extruded using a rolling and extrusion process.

[0019] S3: The other end of the positive electrode busbar is welded to the core body and then inserted into the outer casing processed in step S2.

[0020] S4: The cap body is pressed and sealed by a rolling edge process.

[0021] S5: Injection treatment steps

[0022] S6: Sealing process.

[0023] Furthermore, step S5, the liquid injection process, specifically includes liquid injection, opening formation, and secondary liquid replenishment.

[0024] Step S6, the sealing process, involves pressing the sealing element into the injection hole on the cap body to achieve an interference fit and seal, and then fixing it with laser welding along the perimeter welding position.

[0025] The beneficial effects of this utility model are as follows:

[0026] This utility model provides a battery with a high-safety packaging structure and its manufacturing method, which has the advantages of compact structure, high safety, and suitability for mass production. This application, by simultaneously incorporating an injection hole and a pressure relief and explosion-proof groove on the cap body, makes it applicable to battery injection, open-type formation, secondary electrolyte replenishment, and internal pressure relief processes. In particular, the unique structural design of this application enables secondary electrolyte injection and effectively prevents spontaneous combustion and explosion due to overheating and excessive internal pressure, greatly improving battery safety and meeting the needs of cylindrical batteries of various capacities, especially large-capacity cylindrical batteries. The compact structure and fewer manufacturing steps facilitate mass production and cost reduction. Furthermore, the thickened cap body design significantly reduces battery internal resistance, enabling high-rate charging and discharging without spontaneous explosion or other unexpected phenomena. Therefore, this application has significant economic and practical value. Attached Figure Description

[0027] Figure 1 This is a structural diagram of a battery in the background technology of this utility model;

[0028] Figure 2 This is a structural diagram of a battery with a high-safety packaging structure according to this utility model;

[0029] Figure 3 This is a cross-sectional structural diagram of a battery with a high-safety packaging structure according to this utility model;

[0030] Figure 4 This is a top structural diagram of a battery with a high-safety packaging structure according to the present invention;

[0031] Figure 5 This is a schematic diagram of the battery cell body with a high-safety packaging structure being rolled into the casing according to this utility model;

[0032] Figure 6 This is a schematic diagram of the battery cap cover body with a high-safety packaging structure being installed into the casing according to this utility model;

[0033] Figure 7 This is a schematic diagram of the pressing process of a battery sealing component with a high-safety packaging structure according to this utility model;

[0034] Figure 8 This is a cross-sectional view of a battery cap with a high-safety packaging structure according to this utility model;

[0035] Figure 9 This is a diagram showing the unfolded shape of a battery insulating sealing ring with a high-safety packaging structure according to this utility model.

[0036] Figure 10This is a schematic diagram of a battery sealing component with a high-safety packaging structure before pressing, according to this utility model.

[0037] Figure 11 This is a schematic diagram of a battery sealing component with a high-safety packaging structure after pressing, according to this utility model.

[0038] Figure 12 This is a schematic diagram of the front cap of a battery sealing component with a high-safety packaging structure according to this utility model.

[0039] Figure 13 This is a schematic diagram of a battery sealing component with a high-safety packaging structure after pressing.

[0040] Figure 14 This is another cross-sectional schematic diagram of a battery cap with a high-safety packaging structure according to this utility model;

[0041] Figure 15 This is a partially enlarged view of a battery cap with a high-safety packaging structure according to this utility model;

[0042] Figure 16 This is a schematic diagram of a battery enclosure with a high-safety packaging structure according to the present invention;

[0043] Figure 17 This is another structural schematic diagram of a battery sealing component with a high-safety packaging structure according to this utility model;

[0044] Figure 18 This is a schematic diagram of a battery insulating sealing ring structure with a high-safety packaging structure according to this utility model;

[0045] Figure 19 This is a schematic diagram of the unfolded structure of a battery insulating sealing ring with a high-safety packaging structure according to this utility model;

[0046] Figure 20 This is a schematic diagram of the injection hole structure and sealing component structure of Embodiment 2 of this utility model;

[0047] Figure 21 This is a schematic diagram of the injection hole structure and sealing component structure of Embodiment 3 of this utility model;

[0048] Figure 22 This is a schematic diagram of the injection hole structure and sealing component structure of Embodiment 4 of this utility model;

[0049] Figure 23 This is a process flow diagram of a battery production method with a high-safety packaging structure according to this utility model. Detailed Implementation

[0050] The embodiments of this utility model are described in detail below with reference to the accompanying drawings. The drawings are for reference and illustration only and do not constitute a limitation on the scope of patent protection of this utility model.

[0051] Example 1

[0052] like Figure 1-18 As shown, this utility model provides a battery with a high-safety packaging structure, including a cell body 1 and an outer shell 2 for covering the cell body 1. One end of the cell body 1 is also provided with a positive electrode busbar 3 and a cap 4.

[0053] In this embodiment, the cap body 4 is provided with a sealing groove structure 5, and the sealing groove structure 5 is provided with an insulating sealing ring 501. The insulating sealing ring 501 is located between the cap body 4 and the outer shell 2, and the inner edge of the insulating sealing ring 501 is tightly pressed against the cap body 4.

[0054] In this embodiment, the cap body 4 is also provided with an injection hole structure 6, and the injection hole structure 6 is provided with a sealing member 601. The cross-sectional shape of the injection hole structure 6 includes a cone shape. In this embodiment, the cross-section of the injection hole structure 6 is cone-shaped.

[0055] In this embodiment, the side of the closure 601 includes a straight side 6011 and a beveled side 6012.

[0056] The inner wall of the injection hole structure 6 is a beveled hole wall 61.

[0057] The injection hole structure 6 is also provided with a welding position 602 on one side.

[0058] like Figure 15-16 As shown, the sealing member 601 is pressed into the injection hole structure 6. The inclined hole wall of the injection hole structure 6 is sealed with the inclined side 6012 and the straight side 6011 of the sealing member 601 through an interference fit. The sealing member 601 is tightly fixed to the injection hole structure 6 by laser welding with the welding position 602.

[0059] In this embodiment, the cap body 4 is also provided with a pressure relief and explosion-proof sink 7.

[0060] like Figure 14 As shown, in this embodiment, the bottom plane of the pressure relief and explosion-proof sink 7 is provided with an annular groove 701. The cross-section of the annular groove 701 includes a trapezoid, which is trapezoidal in this embodiment. The battery pressure relief peak can be determined by adjusting the cross-sectional dimension parameters of the annular groove 701 to prevent battery spontaneous combustion and explosion.

[0061] like Figure 17-18As shown, in this embodiment, the positive electrode busbar 3 is provided with a plastic gasket 8, one end of the positive electrode busbar 3 is connected to the battery cell body 1, and the other end is welded to the cap body 4.

[0062] In this embodiment, the insulating sealing ring 501 is provided with a slot structure 5011 for fixing around the cap body 4.

[0063] like Figure 19 As shown, a method for producing a battery with a high-safety packaging structure includes the following steps:

[0064] S1: Weld one end of the positive electrode busbar 3 to the cap body 4 for fixation.

[0065] S2: The battery cell body is installed into the outer casing 2, and the outer casing 2 is rolled into shape through a rolling and extrusion process.

[0066] S3: The other end of the positive electrode busbar 3 is welded to the core body and then inserted into the outer casing 2, which has been processed in step S2.

[0067] S4: The cap body 4 is pressed and sealed by a rolling edge process.

[0068] S5: Injection treatment steps

[0069] S6: Sealing process.

[0070] In this embodiment, step S5, the liquid injection process, specifically includes liquid injection, opening formation, and secondary liquid replenishment.

[0071] Step S6, the sealing process, specifically involves pressing the sealing component 601 into the injection hole on the cap body 4 to achieve an interference fit seal, and then fixing it with laser welding along the peripheral welding position 602.

[0072] Example 2

[0073] like Figure 20 As shown, the difference between this embodiment and Embodiment 1 lies in the structural design of the injection hole structure 6 and the sealing member 601. In this embodiment, the injection hole structure 6 and the sealing member 601 are fixed by threads. The injection hole structure 6 has an internal thread structure 6A, and the sealing member 601 has an external thread structure 601A that mates with the internal thread structure. A rotating structure 601B is provided at the top. In the process of using this application, the sealing member 601 is installed in the injection hole structure 6. During the process of installing the sealing member 601 into the injection hole structure 6, screw glue is applied to the threads. After tightening, it can effectively prevent loosening or leakage, and then welding is performed for reinforcement.

[0074] Example 3

[0075] like Figure 21As shown, this embodiment differs from Embodiments 1 and 2 in that the injection hole structure 6 includes a first accommodating cavity 63 and a second accommodating cavity 64, and the sealing member 601 includes a first fitting portion 6011 and a second fitting portion 6012 that respectively cooperate with the first accommodating cavity 63 and the second accommodating cavity 64. The sealing member 601 is inserted into the first accommodating cavity 61 and the second accommodating cavity 62 through the first fitting portion 6011 and the second fitting portion 6012 and then reinforced by welding.

[0076] Example 4

[0077] like Figure 22 As shown, this embodiment differs from Embodiments 1 to 3 in that:

[0078] In this embodiment, an interference fit structure 100 is provided on one side of the liquid injection hole structure 6. After the battery is filled with liquid, the sealing member 601 is fixed in the liquid injection hole structure 6 by the interference fit structure 100. Of course, during the production process, the interference fit structure 100 can also be provided on the outside of the sealing member 601.

[0079] This utility model provides a battery with a high-safety packaging structure and its manufacturing method, which has the advantages of compact structure, high safety, and suitability for mass production. This application, by simultaneously incorporating an injection hole and a pressure relief and explosion-proof groove on the cap body, makes it applicable to battery injection, open-type formation, secondary electrolyte replenishment, and internal pressure relief processes. In particular, the unique structural design of this application enables secondary electrolyte injection and effectively prevents spontaneous combustion and explosion due to overheating and excessive internal pressure, greatly improving battery safety and meeting the needs of cylindrical batteries of various capacities, especially large-capacity cylindrical batteries. The compact structure and fewer manufacturing steps facilitate mass production and cost reduction. Furthermore, the thickened cap body design significantly reduces battery internal resistance, enabling high-rate charging and discharging without spontaneous explosion or other unexpected phenomena. Therefore, this application has significant economic and practical value.

[0080] The above embodiments are preferred embodiments of the present utility model, but the embodiments of the present utility model are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present utility model shall be considered equivalent substitutions and shall be included within the protection scope of the present utility model.

Claims

1. A battery having a high safety package structure, characterized by: The battery includes an electric core body and an outer shell for covering the electric core body, One end of the electric core body is further provided with a positive electrode busbar and a cap body, The cap body is provided with a sealing groove structure, and the sealing groove structure is provided with an insulating sealing rubber ring, which is located between the cap body and the outer shell, and the inner edge of the insulating sealing rubber ring is tightly pressed against the cap body.

2. The battery with high safety packaging structure according to claim 1, wherein: The cap body is further provided with a liquid injection hole structure, and the liquid injection hole structure is provided with a closure.

3. The battery with high safety packaging structure according to claim 2, wherein: The side edge of the closure includes a straight edge part and an inclined edge part, The inner wall of the liquid injection hole structure is an inclined edge hole wall, One side of the liquid injection hole structure is further provided with a welding position, The closure is pressed into the liquid injection hole structure, the inclined edge hole wall of the liquid injection hole structure is in interference fit with the inclined edge part and the straight edge part of the closure, and the closure is tightly fixed with the liquid injection hole structure by laser welding through the cooperation of the welding position.

4. The battery with high safety packaging structure according to claim 1, wherein: The cap body is further provided with a pressure relief explosion-proof sink.

5. The battery with high safety packaging structure according to claim 4, wherein: The bottom plane of the pressure relief explosion-proof sink is provided with a ring-shaped groove, and the shape of the cross section of the ring-shaped groove includes a trapezoidal shape, and the peak value of the battery pressure relief can be determined by adjusting the cross-sectional size parameters of the ring-shaped groove to prevent the battery from burning and exploding.

6. The battery with high safety packaging structure according to claim 1, wherein: The positive electrode busbar is provided with a plastic gasket, one end of the positive electrode busbar is connected to the electric core body, and the other end is welded together with the cap body.

7. The battery with high safety packaging structure according to claim 1, wherein: The insulating sealing rubber ring is provided with a clamping groove structure for fixing around the cap body.

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