Battery with high-safety packaging structure and production method thereof

Abstract

The invention provides a battery with a high-safety packaging structure, the battery 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 electrode 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 electrode bus bar and a negative electrode 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, a liquid injection hole structure is further arranged on the cap body, 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] The present invention relates to the technical field of battery production, research and development, and design, and in particular to a battery with a high-safety packaging structure and a production method thereof. Background Art

[0002] With the continuous development of science and technology, emerging industries such as electric vehicles, electric bicycles, drones, robots, mobile energy storage, and power tools have developed, and the application scope of power batteries has become wider and wider. It has begun to develop in the direction of smaller size, higher performance, and more economical. At present, the battery structure in the industry generally adopts steel cap components and steel shell rolling and extrusion technology. The basic structure is as follows Figure 1 As shown, there are currently two types of cylindrical batteries in terms of explosion-proof, one with a pressure relief explosion-proof device and one without a pressure relief explosion-proof device. The case without a pressure relief explosion-proof device is mainly used in small batteries. The battery has no pressure relief explosion-proof device, which means that the gas generated by the battery cannot be discharged by opening the pressure relief explosion-proof device. The safety performance is low. The battery has a large capacity or in extreme cases. There is a risk of battery explosion. It is only suitable for some batteries with less exhaust and small capacity, and has great limitations in use. The other type has a pressure relief explosion-proof device, but the pressure relief explosion-proof device has a complex structure, high process difficulty, low production efficiency, and is not conducive to mass production. In short, the existing battery packaging technology has a complex structure, high process difficulty, low production efficiency, and high cost, which is not conducive to mass production. It has a certain negative impact on the promotion and application of batteries. Therefore, further improvement is needed. Summary of the invention

[0003] In view of the above-mentioned deficiencies of the prior art, the present invention provides a battery with a high-safety packaging structure which is delicate in structure, high in safety and conducive to mass production, and a production method thereof.

[0004] The technical solution adopted by the present invention to solve the above problems is:

[0005] The present invention provides a battery with a high-safety packaging structure, comprising a battery body and an outer shell for covering the battery body, wherein one end of the battery body is further provided with a positive busbar and a cap body.

[0006] Furthermore, a sealing groove structure is provided on the cap body, an insulating sealing rubber ring is provided on the sealing groove structure, the insulating sealing rubber ring 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.

[0007] Furthermore, the cap body is provided with a liquid injection hole structure, a sealing member is provided inside the liquid injection hole structure, and the cross-section of the liquid injection hole structure includes a cone.

[0008] Furthermore, the side edge of the closure member includes a straight edge portion and a bevel edge portion.

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

[0010] A welding position is also provided on one side of the injection hole structure.

[0011] The closure is pressed into the injection hole structure, the hypotenuse hole wall of the injection hole structure is sealed with the hypotenuse and straight edge parts of the closure, and the closure is tightly fixed to the injection hole structure by laser welding in cooperation with the welding position.

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

[0013] Furthermore, an annular groove is provided on the bottom plane of the pressure relief and explosion-proof sink, and the cross-section of the annular groove includes a trapezoid. The battery pressure relief peak value can be determined by adjusting the cross-sectional dimension parameters of the annular groove to prevent the battery from spontaneous combustion and explosion.

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

[0015] Furthermore, a slot structure is provided in the insulating sealing rubber ring for fixing it to the periphery of the cap body.

[0016] The present invention 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.

[0018] S2: Install the battery body into the outer shell, and roll the outer shell into shape through the rolling and extrusion process.

[0019] S3: Weld the other end of the positive busbar to the core body and install it into the outer shell processed in step S2.

[0020] S4: Press and seal the cap body through the rolling process.

[0021] S5: injection treatment step,

[0022] S6: Sealing treatment step.

[0023] Furthermore, the step S5 of liquid injection treatment specifically includes liquid injection, opening formation, and secondary liquid replenishment;

[0024] The sealing step S6 is specifically to press the sealing member into the injection hole on the cap body to make it seal by interference fit, and then fix it by laser welding along the peripheral welding position.

[0025] The beneficial effects of the present invention are:

[0026] The battery with a high-safety packaging structure and its production method provided by the present invention have the advantages of delicate structure, high safety, and being conducive to mass production. The present application is suitable for battery liquid injection, opening formation, secondary liquid replenishment, internal pressure relief and other processes by simultaneously setting up liquid injection holes and explosion-proof structures such as pressure relief sinks on the cap body. In particular, the unique structural design of the present application can realize secondary liquid injection, and at the same time effectively prevent the battery from spontaneous combustion and explosion due to overheating and excessive internal pressure, which greatly improves the safety of the battery and meets the needs of cylindrical batteries of various capacities, especially large-capacity cylindrical batteries. The present application has a delicate structure and fewer production processes, which is conducive to mass production and cost reduction. At the same time, the thickened cap body structure design adopted in the present application can greatly reduce the internal resistance of the battery, and can realize high-rate charging and discharging without self-explosion and natural phenomena. Therefore, the present application has great economic value and practical value. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural diagram of a battery of the background technology of the present invention;

[0028] Figure 2 This is a structural diagram of a battery with a high-safety packaging structure according to the present invention;

[0029] Figure 3 This is a cross-sectional structural diagram of a battery with a high-safety packaging structure according to the present invention;

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

[0031] Figure 5 It is a schematic diagram of a process for rolling a battery cell body into a shell with a high-safety packaging structure of the present invention;

[0032] Figure 6 It is a schematic diagram of a battery cap body shelling process with a high-safety packaging structure of the present invention;

[0033] Figure 7 It is a schematic diagram of a pressing process of a battery closure member with a high-safety packaging structure according to the present invention;

[0034] Figure 8 It is a cross-sectional view of a battery cap body with a high-safety packaging structure of the present invention;

[0035] Fig. 9 This is an expanded view of a battery insulating sealing rubber ring with a high-safety packaging structure of the present invention;

[0036] Fig.10 It is a schematic diagram of a battery closure with a high-safety packaging structure before being pressed together according to the present invention;

[0037] Fig.11 It is a schematic diagram of a battery closure with a high-safety packaging structure after being pressed together according to the present invention;

[0038] Fig.12 It is a schematic diagram of a battery closure with a high-safety packaging structure according to the present invention, and a front cap body is pressed together;

[0039] Fig.13 It is a schematic diagram of a cap body after the battery closure with a high-safety packaging structure of the present invention is pressed together;

[0040] Fig.14 It is another cross-sectional schematic diagram of a battery cap body with a high-safety packaging structure of the present invention;

[0041] Fig.15 It is a partial enlarged view of a battery cap body with a high-safety packaging structure of the present invention;

[0042] Fig.16 It is a schematic structural diagram of a battery closure with a high-safety packaging structure according to the present invention;

[0043] Fig.17 It is another structural schematic diagram of a battery enclosure with a high-safety packaging structure according to the present invention;

[0044] Fig.18 This is a schematic diagram of a battery insulation sealing rubber ring structure with a high-safety packaging structure according to the present invention;

[0045] Fig.19 It is a schematic diagram of the unfolded structure of a battery insulating sealing rubber ring with a high-safety packaging structure of the present invention;

[0046] Fig. 20 Schematic diagram of the liquid injection hole structure and the sealing member structure of Example 2 of the present invention;

[0047] Fig.21 Schematic diagram of the injection hole structure and the sealing member structure of Embodiment 3 of the present invention;

[0048] Fig. 22 Schematic diagram of the injection hole structure and the sealing member structure of Example 4 of the present invention;

[0049] Fig.23 The present invention is a process flow chart of a battery production method with a high-safety packaging structure. DETAILED DESCRIPTION

[0050] The following specifically describes the embodiments of the present invention in conjunction with the accompanying drawings, which are only for reference and illustration and do not constitute a limitation on the scope of patent protection of the present invention.

[0051] Example 1

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

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

[0054] In this embodiment, a liquid injection hole structure 6 is further provided on the cap body 4. A sealing member 601 is provided inside the liquid injection hole structure 6. The cross-section of the liquid injection hole structure 6 includes a cone. In this embodiment, the cross-section of the liquid injection hole structure 6 is a cone.

[0055] In this embodiment, the side edge of the sealing member 601 includes a straight edge portion 6011 and a bevel edge portion 6012.

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

[0057] A welding position 602 is also provided on one side of the injection hole structure 6.

[0058] like Figure 15-16 As shown, the closure member 601 is pressed into the injection hole structure 6, the hypotenuse hole wall of the injection hole structure 6 is sealed with the hypotenuse portion 6012 and the straight edge portion 6011 of the closure member 601, and the closure member 601 is tightly fixed to the injection hole structure 6 by laser welding in cooperation with the welding position 602.

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

[0060] like Fig.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, and the cross-section of the annular groove 701 includes a trapezoid, which is a trapezoid in this embodiment. The battery pressure relief peak value can be determined by adjusting the cross-sectional size parameters of the annular groove 701 to prevent the battery from spontaneous combustion and explosion.

[0061] like Figure 17-18 As shown, in this embodiment, a plastic gasket 8 is provided on the positive busbar 3 , one end of the positive 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, a slot structure 5011 is provided in the insulating sealing rubber ring 501 for fixing the insulating sealing rubber ring 501 to the periphery of the cap body 4 .

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

[0064] S1: Weld one end of the positive busbar 3 to the cap body 4,

[0065] S2: The battery cell body is installed into the outer shell 2, and the outer shell 2 is roll-formed by a rolling and extruding process.

[0066] S3: Weld the other end of the positive busbar 3 to the core body and install it into the outer shell 2 processed in step S2.

[0067] S4: Press and seal the cap body 4 by rolling process,

[0068] S5: injection treatment step,

[0069] S6: Sealing treatment step.

[0070] In this embodiment, the step S5 of liquid injection treatment specifically includes liquid injection, opening formation, and secondary liquid replenishment;

[0071] The sealing step S6 is specifically to press the sealing member 601 into the injection hole on the cap body 4 to make it seal by interference fit, and then fix it along the peripheral welding position 602 by laser welding.

[0072] Example 2

[0073] like Fig. 20 As shown, the difference between this embodiment and embodiment 1 lies in the structural design of the injection hole structure 6 and the closure 601. In this embodiment, the injection hole structure 6 and the closure 601 are fixed by threads. The injection hole structure 6 is provided with an internal internal thread structure 6A, and the closure 601 is provided with an external thread structure 601A matching the internal thread structure, and a rotating structure 601B is provided on the top. During use, the present application installs the closure 601 in the injection hole structure 6. During use, the present application adds screw glue to the threads when installing the closure 601 to the injection hole structure 6. After locking, it can effectively prevent loosening or leakage, and then welding reinforcement is performed.

[0074] Example 3

[0075] like Fig.21As shown, the difference between this embodiment and Embodiment 1 and Embodiment 2 is that the injection hole structure 6 includes a first accommodating cavity 63 and a second accommodating cavity 64, and the closing member 601 includes a first interlocking portion 6011 and a second interlocking portion 6012 respectively matching with the first accommodating cavity 63 and the second accommodating cavity 64, and the closing member 601 is inserted into the first accommodating cavity 61 and the second accommodating cavity 62 through the first interlocking portion 6011 and the second interlocking portion 6012 and then welded and reinforced.

[0076] Example 4

[0077] like Fig. 22 As shown, the difference between this embodiment and embodiments 1 to 3 is that:

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

[0079] The battery with a high-safety packaging structure and its production method provided by the present invention have the advantages of delicate structure, high safety, and being conducive to mass production. The present application is suitable for battery liquid injection, opening formation, secondary liquid replenishment, internal pressure relief and other processes by simultaneously setting up liquid injection holes and explosion-proof structures such as pressure relief sinks on the cap body. In particular, the unique structural design of the present application can realize secondary liquid injection, and at the same time effectively prevent the battery from spontaneous combustion and explosion due to overheating and excessive internal pressure, which greatly improves the safety of the battery and meets the needs of cylindrical batteries of various capacities, especially large-capacity cylindrical batteries. The present application has a delicate structure and fewer production processes, which is conducive to mass production and cost reduction. At the same time, the thickened cap body structure design adopted in the present application can greatly reduce the internal resistance of the battery, and can realize high-rate charging and discharging without self-explosion and natural phenomena. Therefore, the present application has great economic value and practical value.

[0080] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A battery with a high safety packaging structure, characterized in that: It comprises a battery cell body and an outer shell for covering the battery cell body. One end of the battery cell body is also provided with a positive busbar and a cap body.

2. A battery with a high safety packaging structure according to claim 1, characterized in that: The cap body is provided with a sealing groove structure, the sealing groove structure is provided with an insulating sealing rubber ring, the insulating sealing rubber ring 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.

3. A battery with a high safety packaging structure according to claim 1, characterized in that: The cap body is also provided with a liquid injection hole structure, and a sealing member is arranged inside the liquid injection hole structure.

4. A battery with a high safety packaging structure according to claim 3, characterized in that: The side edge of the closure member includes a straight edge portion and a bevel edge portion, The inner wall of the injection hole structure is a bevel hole wall. A welding position is also provided on one side of the injection hole structure. The closure is pressed into the injection hole structure, the hypotenuse hole wall of the injection hole structure is sealed with the hypotenuse and straight edge parts of the closure, and the closure is tightly fixed to the injection hole structure by laser welding in cooperation with the welding position.

5. The battery with a high safety packaging structure according to claim 1, characterized in that: The cap body is also provided with a pressure relief and explosion-proof sink.

6. A battery with a high safety packaging structure according to claim 5, characterized in that: The bottom plane of the pressure relief and explosion-proof sink is provided with an annular groove, and the cross-sectional shape of the annular groove includes a trapezoid. The cross-sectional dimension parameters of the annular groove can be adjusted to determine the peak value of battery pressure relief to prevent the battery from spontaneous combustion and explosion.

7. A battery with a high safety packaging structure according to claim 1, characterized in that: A plastic gasket is arranged on the positive busbar, one end of the positive busbar is connected to the battery cell body, and the other end is welded to the cap body.

8. The battery with a high safety packaging structure according to claim 1, characterized in that: A slot structure is provided in the insulating sealing rubber ring for fixing the periphery of the cap body.

9. A method for producing a battery with a high-safety packaging structure, characterized in that: The steps include: S1: Weld one end of the positive busbar to the cap body. S2: Install the battery body into the outer shell, and roll the outer shell into shape through the rolling and extrusion process. S3: Weld the other end of the positive busbar to the core body and install it into the outer shell processed in step S2. S4: Press and seal the cap body through the rolling process. S5: injection treatment step, S6: Sealing treatment step.

10. The method for producing a battery with a high-safety packaging structure according to claim 9, characterized in that: Step S5: the liquid injection treatment step specifically includes liquid injection, opening formation, and secondary liquid replenishment; The sealing step S6 is specifically to press the sealing member into the injection hole on the cap body to make it seal by interference fit, and then fix it by laser welding along the peripheral welding position.

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