Novel lithium battery top cover

Abstract

The utility model discloses a novel lithium battery top cover. The novel lithium battery top cover comprises a polished aluminum sheet, lower plastic, a pole, a connecting sheet, a sealing ring and upper plastic, a first step and a second step are arranged on the pole; a welding hole is formed in the connecting piece, and the welding hole is matched with the second step; and the pole and the connecting sheet are welded and then assembled. According to the novel lithium battery top cover provided by the utility model, the light aluminum sheet, the lower plastic cement, the pole, the connecting sheet, the sealing ring and the upper plastic cement are arranged, the connecting sheet is sleeved and welded with the second step preset on the pole in advance, and then the connecting sheet is assembled with the light aluminum sheet, the lower plastic cement, the sealing ring and the upper plastic cement; the risk that the sealing performance of the sealing ring is reduced and the upper plastic cement is expanded and cracked due to welding can be effectively reduced or even avoided, and the energy ratio of the battery can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium batteries, in particular to a novel lithium battery top cover. Background Art

[0002] The working principle of lithium-ion batteries is based on the intercalation and deintercalation of lithium ions between the positive and negative electrodes during the charge and discharge process. During charging, lithium ions are deintercalated from the positive electrode, moved to the negative electrode through the electrolyte and embedded in it, making the negative electrode in a lithium-rich state; the discharge process is the opposite, lithium ions are deintercalated from the negative electrode and moved to the positive electrode. Lithium-ion batteries are a highly efficient energy storage device that is widely used in various electronic devices and new energy vehicles.

[0003] At present, the top cover of most lithium-ion batteries is connected to the pole bottom plate by laser welding. The pole bottom plate must have sufficient welding thickness. Since the pole bottom plate needs to be assembled before welding, a lot of heat will be generated when the connecting piece is welded on the pole bottom plate. The heat is transmitted to the upper plastic, and the upper plastic is heated and crystallized for a second time. Affected by the rebound force of the sealing ring, the pole drops, the compression ratio of the sealing ring changes, and its sealing performance is reduced. In addition, the pole expands due to heat and is prone to cracking the upper plastic.

[0004] Therefore, it is necessary to provide a new type of lithium battery top cover to solve the above technical problems. Utility Model Content

[0005] In view of the above situation, in order to overcome the defects of the prior art, the utility model provides a novel lithium battery top cover which can reduce the risk of reduced sealing performance of the sealing ring and cracking of the upper plastic caused by welding.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0007] A novel lithium battery top cover comprises: a plain aluminum sheet, a lower plastic, a pole, a connecting sheet, a sealing ring and an upper plastic. The pole is provided with a first step and a second step. The connecting sheet is provided with a welding hole, which is matched with the second step. The pole and the connecting sheet are first welded and then assembled.

[0008] Preferably, a heat-insulating paper is installed at the bottom of the lower plastic, and the heat-insulating paper is arranged between the connecting piece and the lower plastic.

[0009] Preferably, a slot is provided on the pole, and the slot is annular and matches the upper plastic.

[0010] Preferably, a mounting hole is provided on the plain aluminum sheet, a gear ring is provided on the inner wall of the mounting hole, and teeth matching the gear ring are provided on the outer circle of the upper plastic.

[0011] Preferably, an explosion-proof hole is opened on the plain aluminum sheet, an explosion-proof valve is installed in the explosion-proof hole, and a protective patch is installed on the top of the explosion-proof valve.

[0012] Preferably, the pole is formed by welding a copper pole and an aluminum sheet, wherein the first step and the second step are both arranged on the aluminum sheet, and the slot is arranged on the copper pole.

[0013] Preferably, a positioning groove is provided at the bottom of the copper column.

[0014] Preferably, a positioning column adapted to the positioning groove is installed on the top of the aluminum sheet.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] (1) The utility model provides a bare aluminum sheet, a lower plastic, a pole, a connecting sheet, a sealing ring and an upper plastic, and pre-sleeves and welds the connecting sheet with the second step preset on the pole, and then assembles it with the bare aluminum sheet, the lower plastic, the sealing ring and the upper plastic. This can effectively reduce or even avoid the risk of reduced sealing performance of the sealing ring and cracking of the upper plastic caused by welding, and can help improve the energy efficiency of the battery;

[0017] (2) The utility model can protect the lower plastic by installing heat-insulating paper on the bottom of the lower plastic;

[0018] (3) The utility model provides a slot on the pole, so that the upper plastic can be connected to the pole through the slot, thus playing a limiting role;

[0019] (4) The utility model sets a gear ring and teeth, and utilizes the meshing of the gear ring and the ruler teeth to limit the upper plastic;

[0020] (5) The utility model can improve the safety of the battery by providing explosion-proof holes and installing explosion-proof valves;

[0021] (6) The utility model can reduce material costs by providing a pole composed of a copper column and an aluminum sheet. The positioning groove and the positioning column can ensure accurate positioning of the copper column and the aluminum sheet during welding, thereby improving the quality of the welded pole. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of the explosion structure of a novel lithium battery top cover provided by the utility model;

[0023] Figure 2 for Figure 1 The schematic diagram of the structure of the pole in the new lithium battery top cover shown;

[0024] Figure 3 for Figure 1 The schematic diagram of the structure of the connecting piece structure in the new lithium battery top cover shown;

[0025] Figure 4 for Figure 1The schematic diagram of the connection between the pole and the connecting piece in the new lithium battery top cover shown;

[0026] Figure 5 for Figure 1 The schematic diagram of the structure of the new type of lithium battery top cover is shown;

[0027] Figure 6 for Figure 1 The schematic diagram of the structure of the copper column in the new lithium battery top cover shown;

[0028] Figure 7 for Figure 1 Schematic diagram of the structure of the aluminum sheet in the new lithium battery top cover shown.

[0029] Among them, the names corresponding to the figure numbers are: 1-plain aluminum sheet, 2-lower plastic, 3-pole, 4-connecting plate, 5-first step, 6-welding hole, 7-welding seam, 8-second step, 9-sealing ring, 10-insulating paper, 11-mounting hole, 12-card slot, 13-upper plastic, 14-gear ring, 15-explosion-proof hole, 16-explosion-proof valve, 17-protective patch, 18-copper column, 19-aluminum sheet, 20-positioning groove, 21-positioning column, 22-welding surface. DETAILED DESCRIPTION

[0030] The present invention is further described below in conjunction with the accompanying drawings and embodiments. The present invention includes but is not limited to the following embodiments.

[0031] Embodiment 1:

[0032] like Figure 1-7As shown, the new lithium battery top cover provided by the utility model includes: a bare aluminum sheet 1, a lower plastic 2, a pole 3, a connecting sheet 4, a sealing ring 9 and an upper plastic 13. The pole 3 is provided with a first step 5 and a second step 8. The connecting sheet 4 is provided with a welding hole 6. The welding hole 6 is adapted to the second step 8. The pole 3 and the connecting sheet 4 are welded first and then assembled. When assembling the top cover, the welding hole 6 of the connecting sheet 4 is first aligned with the second step 8 of the pole 3 and inserted. The bottom of the connecting sheet 4 is fitted with the top of the first step 5, and the top of the connecting sheet 4 is flush with the top of the second step 8. Then, laser welding or pulse welding is used along the joint between the welding hole 6 and the second step 8 to form an annular weld 7. After the pole 3 is cooled, the sealing ring 7 is then sealed. The ring 9 is put on the pole 3, and the bottom of the sealing ring 9 is close to the top of the second step 8. Then the pole 3 is passed through the lower plastic 2 and the bare aluminum sheet 1 in sequence, and then the upper plastic 13 is put on the pole 3. Since the pole 3 and the connecting plate 4 are welded first and then assembled with other accessories after cooling, the sealing performance of the sealing ring 9 will not be affected, and the upper plastic 13 will not be caused to swell and crack. In addition, compared with the method of directly welding the connecting piece to the bottom of the pole bottom plate, the present application adopts the method of welding the connecting piece to the preset step on the top surface of the pole bottom plate, which is not easy to weld through the pole bottom plate. Therefore, the thickness of the pole bottom plate can be minimized, thereby increasing the available space inside the battery, that is, improving the space utilization rate of the battery and improving the energy ratio of the battery.

[0033] By arranging a bare aluminum sheet 1, a lower plastic 2, a pole 3, a connecting sheet 4, a sealing ring 9 and an upper plastic 13, and pre-connecting and welding the connecting sheet 4 with the second step 8 preset on the pole 3, and then assembling them with the bare aluminum sheet 1, the lower plastic 2, the sealing ring 9 and the upper plastic 13, the risk of reduced sealing performance of the sealing ring 9 and cracking of the upper plastic 13 caused by welding can be effectively reduced or even avoided, and the energy ratio of the battery can be improved.

[0034] Embodiment 2:

[0035] like Figure 1 As shown, a heat-insulating paper 10 is installed at the bottom of the lower plastic 2, and the heat-insulating paper 10 is arranged between the connecting piece 4 and the lower plastic 2. When the connecting piece 4 is welded to the tab, the heat generated is blocked by the heat-insulating paper 10, thereby protecting the lower plastic 2 and preventing it from being deformed or even melted due to heat.

[0036] By installing the heat insulation paper 10 on the bottom of the lower plastic 2 , the lower plastic 2 can be protected.

[0037] Embodiment 3:

[0038] like Figure 2 As shown, a slot 12 is provided on the pole 3. The slot 13 is annular and matches the upper plastic 13. When in use, the upper plastic 13 is sleeved on the pole 3 and engaged with the slot 13, thereby preventing the upper plastic 13 from falling off the pole 3.

[0039] By providing the clamping groove 12 on the pole 3 , the upper plastic 13 can be clamped with the pole 3 through the clamping groove 12 , thereby playing a limiting role.

[0040] Embodiment 4:

[0041] like Figure 5 As shown, a mounting hole 11 is provided on the bare aluminum sheet 1, a gear ring 14 is provided on the inner wall of the mounting hole 11, and teeth (not shown in the figure) matched with the gear ring 14 are provided on the outer circle of the upper plastic 13. After the top end of the pole 3 passes through the mounting hole 11, the upper plastic 13 is sleeved on the pole 3, and the teeth are aligned with the gear ring for insertion, thereby preventing the upper plastic 13 from rotating and playing a limiting role.

[0042] By providing the gear ring 14 and the teeth, the upper plastic 13 is limited by the meshing of the gear ring 14 and the ruler teeth.

[0043] Embodiment 5:

[0044] like Figure 1 and Figure 5 As shown, an explosion-proof hole 15 is opened on the bare aluminum sheet 1, an explosion-proof valve 16 is installed in the explosion-proof hole 15, and a protective patch 17 is installed on the top of the explosion-proof valve 16. When there is an abnormality inside the battery, such as high temperature, burning, etc., the explosion-proof valve 16 ruptures to exhaust air to prevent the battery from exploding. The protective patch 17 is used for daily protection of the explosion-proof valve 16.

[0045] By providing the explosion-proof hole 15 and installing the explosion-proof valve 16, the safety of the battery can be improved.

[0046] Embodiment 6:

[0047] like Figure 6-7 As shown, the pole 3 (generally the negative pole, the positive pole is an integral structure of the same material) is welded by a copper column 18 and an aluminum sheet 19, wherein the first step 5 and the second step 8 are both arranged on the aluminum sheet 19, and the card slot 12 is arranged on the copper column 18, a positioning groove 20 is provided at the bottom of the copper column 18, a positioning column 21 adapted to the positioning groove 20 is installed on the top of the aluminum sheet 19, and a welding surface 22 is arranged on the top of the aluminum sheet 19. During welding, the positioning column 21 is aligned with the positioning groove 20 and inserted so that the welding surface 22 fits the bottom of the copper column 18, and then welding can be started to connect the welding surface 22 to the bottom of the copper column 19.

[0048] By providing the pole 3 composed of the copper column 18 and the aluminum sheet 19, the material cost can be reduced. By providing the positioning groove 20 and the positioning column 21, the copper column 18 and the aluminum sheet 19 can be accurately positioned during welding, and the quality of the welded pole 3 is better.

[0049] Working principle: When in use, first align the welding hole 6 of the connecting piece 4 with the second step 8 of the pole 3, insert it, the bottom of the connecting piece 4 fits with the top of the first step 5, and the top of the connecting piece 4 is flush with the top of the second step 8, and then use laser welding or pulse welding along the joint between the welding hole 6 and the second step 8 to form a circular weld 7. After the pole 3 cools down, put the sealing ring 9 on the pole 3, and the bottom of the sealing ring 9 is close to the top of the second step 8. Then, the pole 3 passes through the lower plastic 2 and the bare aluminum sheet 1 in turn, and then the upper plastic 13 is put on the pole 3. During the process, the rubber wrapping is carried out simultaneously. Since the pole 3 and the connecting plate 4 are welded first and then assembled with other accessories after cooling, the sealing performance of the sealing ring 9 will not be affected, and the upper plastic 13 will not be caused to swell and crack. In addition, compared with the method of directly welding the connecting piece to the bottom of the pole bottom plate, the present application adopts a method of welding the connecting piece to the top surface of the pole bottom plate with a preset step, which is not easy to weld through the pole bottom plate. Therefore, the thickness of the pole bottom plate can be minimized, thereby increasing the available space inside the battery, that is, improving the space utilization rate of the battery and improving the energy ratio of the battery.

Claims

1. A new type of lithium battery top cover, characterized in that: include: A plain aluminum sheet (1), a lower plastic (2), a pole (3), a connecting sheet (4), a sealing ring (9) and an upper plastic (13); The pole (3) is provided with a first step (5) and a second step (8); The connecting piece (4) is provided with a welding hole (6), and the welding hole (6) is adapted to fit the second step (8); The pole (3) and the connecting piece (4) are first welded and then assembled.

2. A novel lithium battery top cover according to claim 1, characterized in that: The bottom of the lower plastic (2) is installed with heat insulation paper (10).

3. A novel lithium battery top cover according to claim 1, characterized in that: The pole (3) is provided with a slot (12) adapted to the upper plastic (13).

4. A novel lithium battery top cover according to claim 1, characterized in that: The smooth aluminum sheet (1) is provided with a mounting hole (11), and a gear ring (14) is provided in the mounting hole (11).

5. A novel lithium battery top cover according to claim 4, characterized in that: The upper plastic (13) is provided with teeth matching the gear ring (14).

6. A novel lithium battery top cover according to claim 1, characterized in that: The plain aluminum sheet (1) is provided with an explosion-proof hole (15), and an explosion-proof valve (16) is installed in the explosion-proof hole (15).

7. A novel lithium battery top cover according to claim 1, characterized in that: The pole (3) is formed by welding a copper pole (18) and an aluminum sheet (19).

8. A novel lithium battery top cover according to claim 7, characterized in that: A positioning groove (20) is provided at the bottom of the copper column (18).

9. A novel lithium battery top cover according to claim 7, characterized in that: A positioning column (21) is installed on the top of the aluminum sheet (19).

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