Square aluminum shell battery top cover

Abstract

The utility model relates to a square aluminum shell battery top cover, which comprises a top cover substrate, and an upper plastic, a metal welding ring, a first sealing ring, a pole, a second sealing ring and a lower plastic which are arranged on the top cover substrate, the pole sequentially penetrates through the upper plastic, the metal welding ring, the first sealing ring, the pole hole, the second sealing ring and the lower plastic to be installed on the top cover base plate, the first sealing ring is arranged in the circumferential direction of the pole in a sleeving mode and abuts against the position between the pole and the metal welding ring, and the second sealing ring is arranged in the circumferential direction of the pole in a sleeving mode and abuts against the position between the pole and the top cover base plate. The compression ratios of the first sealing ring and the second sealing ring are the same. The battery top cover disclosed by the utility model is provided with the first sealing ring and the second sealing ring with the same compression ratio, and the first sealing ring and the second sealing ring interact and are mutually balanced, so that the pole reaches a stable state, the upward floating of the pole is inhibited, and the reliability of the top cover is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of lithium ion batteries, and in particular relates to a square aluminum shell battery top cover. Background Art

[0002] The increasing demand for lithium-ion power batteries has put forward higher requirements on the cost and complexity of the battery cover. For square aluminum shell battery covers, we must especially consider reliability and space occupation, which includes the exposed size of the pole on the upper surface of the cover and the excess size of the pole on the lower surface of the cover.

[0003] The top cover of square aluminum shell batteries is generally divided into two types: injection molding (conventional injection molding and minimalist) and riveting. The reliability of the riveted top cover is good, the pole will not float up or sink, but it takes up a large space; the reliability of the conventional injection molded top cover is average, the pole has the risk of sinking, and it takes up a large space; the reliability of the minimalist top cover is average, the pole has the risk of floating up, and it takes up a small space. This is because the minimalist top cover uses PPS injection molding plastic to resist the force of the sealing ring and prevent the pole from floating up, but PPS will shrink and creep under high temperature and other conditions, causing its force to resist the sealing ring to decrease, which in turn causes the pole to float up.

[0004] In general, the above-mentioned types of top covers each have their own advantages and disadvantages, and none of them can simultaneously meet the requirements of good reliability and small space occupation.

[0005] In summary, a new top cover structure is needed that can ensure good reliability and small space occupation at the same time. Summary of the invention

[0006] The utility model aims to provide a square aluminum shell battery top cover, which not only takes up a small space of the top cover, but also suppresses the floating of the pole and ensures the reliability of the top cover.

[0007] The technical solution adopted by the utility model to solve the above-mentioned problem is: a square aluminum shell battery top cover, including a top cover substrate and an upper plastic, a metal welding ring, a first sealing ring, a pole, a second sealing ring, and a lower plastic installed on the top cover substrate. The top cover substrate is provided with a pole hole, and the pole passes through the upper plastic, the metal welding ring, the first sealing ring, the pole hole, the second sealing ring, and the lower plastic in sequence and is installed on the top cover substrate. The first sealing ring is sleeved on the circumference of the pole and abuts between the pole and the metal welding ring, and the second sealing ring is sleeved on the circumference of the pole and abuts between the pole and the top cover substrate.

[0008] The poles include positive poles and negative poles.

[0009] Preferably, the upper plastic includes a positive electrode conductive upper plastic and a negative electrode insulating upper plastic.

[0010] Preferably, the metal welding ring is connected to the top cover substrate by laser welding.

[0011] Preferably, the battery top cover also includes an explosion-proof valve assembly.

[0012] More preferably, the explosion-proof valve assembly includes an explosion-proof valve, an explosion-proof valve patch, and an explosion-proof hole opened on the top cover substrate, the explosion-proof valve is arranged in the explosion-proof hole to close the explosion-proof hole, and the explosion-proof valve patch is arranged on the explosion-proof hole and covers the explosion-proof valve.

[0013] Preferably, the compression ratio of the first sealing ring is the same as that of the second sealing ring.

[0014] More preferably, the compression ratio of the first sealing ring to the second sealing ring is 30-36%.

[0015] Compared with the prior art, the advantages of the utility model are:

[0016] The square aluminum shell battery top cover of the utility model occupies a small space, and includes a first sealing ring and a second sealing ring. The first sealing ring is sleeved on the circumference of the pole and abuts between the pole and the metal welding ring, and the second sealing ring is sleeved on the circumference of the pole and abuts between the pole and the top cover substrate, and the first sealing ring and the second sealing ring have the same compression ratio. The first sealing ring and the second sealing ring interact and balance with each other, so that the pole reaches a stable state, the floating of the pole is suppressed, the reliability of the top cover is improved, and the disadvantage of the minimalist top cover in the prior art that the PPS injection molding will shrink and creep under high temperature and other conditions, resulting in a decrease in the force resisting the sealing ring, and then causing the pole to float is avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is an exploded view of the square aluminum shell battery top cover in the embodiment of the utility model.

[0018] Figure 2 It is a cross-sectional view of the square aluminum shell battery top cover in the embodiment of the utility model.

[0019] Figure 3 It is a partially enlarged schematic diagram of the negative pole position A of the cross-sectional view of the square aluminum shell battery top cover in the embodiment of the present utility model.

[0020] Among them: 1 is the top cover substrate, 2 is the upper plastic, 2.1 is the positive conductive upper plastic, 2.2 is the negative insulating upper plastic, 3 is the metal welding ring, 4 is the first sealing ring, 5 is the pole, 5.1 is the positive pole, 5.2 is the negative pole, 6 is the second sealing ring, 7 is the lower plastic, 8 is the pole hole, 8.1 is the positive pole hole, 8.2 is the negative pole hole, 9 is the explosion-proof valve assembly, 9.1 is the explosion-proof valve, 9.2 is the explosion-proof valve patch, and 9.3 is the explosion-proof hole. DETAILED DESCRIPTION

[0021] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0022] like Figure 1-3 As shown, an exploded view of the square aluminum shell battery top cover in this embodiment, a cross-sectional view of the square aluminum shell battery top cover in this embodiment, and a partially enlarged schematic diagram of the negative electrode column position in the cross-sectional view of the square aluminum shell battery top cover in this embodiment.

[0023] A square aluminum shell battery top cover comprises a top cover substrate 1 and an upper plastic 2, a metal welding ring 3, a first sealing ring 4, a pole 5, a second sealing ring 6, and a lower plastic 7 installed on the top cover substrate 1. The top cover substrate 1 is provided with a pole hole 8. The pole 5 sequentially passes through the upper plastic 2, the metal welding ring 3, the first sealing ring 4, the pole hole 8, the second sealing ring 6, and the lower plastic 7 and is installed on the top cover substrate 1. The first sealing ring 4 is sleeved on the circumference of the pole 5 and abuts between the pole 5 and the metal welding ring 3. The second sealing ring 6 is sleeved on the circumference of the pole 5 and abuts between the pole 5 and the top cover substrate 1. The compression ratio of the first sealing ring 4 and the second sealing ring 6 is the same, and the compression ratio of the first sealing ring 4 and the second sealing ring 6 is 33%; the metal welding ring 3 is connected to the top cover substrate 1 by laser welding.

[0024] The battery top cover further comprises an explosion-proof valve assembly 9, which comprises an explosion-proof valve 9.1, an explosion-proof valve patch 9.2 and an explosion-proof hole 9.3 opened on the top cover substrate 1, wherein the explosion-proof valve 9.1 is arranged in the explosion-proof hole 9.3 to close the explosion-proof hole 9.3, and the explosion-proof valve patch 9.2 is arranged on the explosion-proof hole 9.3 and covers the explosion-proof valve 9.1.

[0025] The upper plastic 2 includes a positive conductive upper plastic 2.1 and a negative insulating upper plastic 2.2; the pole 5 includes a positive pole 5.1 and a negative pole 5.2; and the pole hole 8 includes a positive pole hole 8.1 and a negative pole hole 8.2. Specifically, the positive electrode column 5.1 sequentially penetrates the positive electrode conductive upper plastic 2.1, the metal welding ring 3, the first sealing ring 4, the positive electrode column hole 8.1, the second sealing ring 6, and the lower plastic 7 and is installed on the top cover substrate 1, the first sealing ring 4 is sleeved on the circumference of the positive electrode column 5.1 and abuts between the positive electrode column 5.1 and the metal welding ring 3, the second sealing ring 6 is sleeved on the circumference of the positive electrode column 5.1 and abuts between the positive electrode column 5.1 and the top cover substrate 1; the negative electrode column 5.2 sequentially penetrates the negative electrode insulating upper plastic 2.2, the metal welding ring 3, the first sealing ring 4, the negative electrode column hole 8.2, the second sealing ring 6, and the lower plastic 7 and is installed on the top cover substrate 1, the first sealing ring 4 is sleeved on the circumference of the negative electrode column 5.2 and abuts between the negative electrode column 5.2 and the metal welding ring 3, the second sealing ring 6 is sleeved on the circumference of the negative electrode column 5.2 and abuts between the negative electrode column 5.2 and the top cover substrate 1.

[0026] In practical applications, the square aluminum shell battery top cover is assembled according to the following assembly method:

[0027] (1) Assemble the explosion-proof valve 9.1 and the explosion-proof hole 9.3 in the top cover substrate 1 and then perform laser welding.

[0028] (2) The second sealing ring 6, the positive electrode column 5.1, the first sealing ring 4, and the metal welding ring 3 are sequentially placed and pressed into the positive electrode column hole 8.1 of the top cover substrate 1 in step (1), so that the first sealing ring 4 is sleeved on the circumference of the positive electrode column 5.1 and abuts between the positive electrode column 5.1 and the metal welding ring 3, and the second sealing ring 6 is sleeved on the circumference of the positive electrode column 5.1 and abuts between the positive electrode column 5.1 and the top cover substrate 1. During the assembly process, the compression ratios of the first sealing ring 4 and the second sealing ring 6 are controlled to be 33%, and then the metal welding ring 3 is laser welded to the upper surface of the top cover substrate 1.

[0029] (3) The second sealing ring 6, the negative electrode column 5.2, the first sealing ring 4, and the metal welding ring 3 are sequentially placed and pressed into the negative electrode column hole 8.2 of the top cover substrate 1 in step (2), so that the first sealing ring 4 is sleeved on the circumference of the negative electrode column 5.2 and abuts between the negative electrode column 5.2 and the metal welding ring 3, and the second sealing ring 6 is sleeved on the circumference of the negative electrode column 5.2 and abuts between the negative electrode column 5.2 and the top cover substrate 1. During the assembly process, the compression ratios of the first sealing ring 4 and the second sealing ring 6 are controlled to be 33%, and then the metal welding ring 3 is laser welded to the upper surface of the top cover substrate 1.

[0030] (4) Assemble the top cover substrate of step (3) with the lower plastic 7.

[0031] (5) PPS injection molding is performed on the positive electrode column 5.1 and the negative electrode column 5.2 respectively to obtain the positive electrode conductive upper plastic 2.1 and the negative electrode insulating upper plastic 2.2.

[0032] (6) The top cover of step (5) is tested for air tightness, insulation, pole internal resistance, etc., and then the explosion-proof valve patch 9.2 is attached to the explosion-proof hole 9.3 and covers the explosion-proof valve 9.1 to obtain a finished square aluminum shell battery top cover.

[0033] In addition to the above embodiments, the present invention also includes other implementation modes. Any technical solutions formed by equivalent transformation or equivalent replacement should fall within the protection scope of the claims of the present invention.

Claims

1. A square aluminum shell battery top cover, characterized in that: The invention comprises a top cover substrate (1), and an upper plastic (2), a metal welding ring (3), a first sealing ring (4), a pole (5), a second sealing ring (6), and a lower plastic (7) mounted on the top cover substrate (1); a pole hole (8) is provided on the top cover substrate (1); the pole (5) passes through the upper plastic (2), the metal welding ring (3), the first sealing ring (4), the pole hole (8), the second sealing ring (6), and the lower plastic (7) in sequence and is mounted on the top cover substrate (1); the first sealing ring (4) is sleeved on the circumference of the pole (5) and abuts between the pole (5) and the metal welding ring (3); the second sealing ring (6) is sleeved on the circumference of the pole (5) and abuts between the pole (5) and the top cover substrate (1); and the compression ratios of the first sealing ring (4) and the second sealing ring (6) are the same.

2. The square aluminum shell battery top cover according to claim 1, characterized in that: The upper plastic (2) comprises a positive electrode conductive upper plastic (2.1) and a negative electrode insulating upper plastic (2.2).

3. The square aluminum shell battery top cover according to claim 1, characterized in that: The metal welding ring (3) is connected to the top cover base plate (1) through laser welding.

4. The square aluminum shell battery top cover according to claim 1, characterized in that: The battery top cover also includes an explosion-proof valve assembly (9).

5. The square aluminum shell battery top cover according to claim 4, characterized in that: The explosion-proof valve assembly (9) comprises an explosion-proof valve (9.1), an explosion-proof valve patch (9.2), and an explosion-proof hole (9.3) opened on the top cover substrate (1); the explosion-proof valve (9.1) is arranged in the explosion-proof hole (9.3) to close the explosion-proof hole (9.3); and the explosion-proof valve patch (9.2) is arranged on the explosion-proof hole (9.3) and covers the explosion-proof valve (9.1).

6. The square aluminum shell battery top cover according to claim 1, characterized in that: The compression ratio of the first sealing ring (4) and the second sealing ring (6) is 30-36%.

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