Liquid-supplementing square-shell battery cell

Abstract

The utility model discloses a liquid-supplementing square-shell battery cell which comprises a single battery cell, a top cover is arranged at the top end of the single battery cell, a liquid injection hole is formed in the top cover, the liquid-supplementing square-shell battery cell further comprises a sealing nail, the sealing nail is arranged in the liquid injection hole, a first sealing ring is arranged at the bottom end of the sealing nail, and the first sealing ring is arranged between the liquid injection hole and the sealing nail; the square nut is arranged at the bottom end of the liquid injection hole, a sealing groove is formed in the square nut, and a second sealing ring is arranged in the sealing groove; the top cover liquid injection port of the square-shell battery cell adopts a bolt fastening and sealing mode, when the electrolyte of the battery cell is less or is quickly dried up, the fixed bolt can be loosened to inject the electrolyte into the battery cell, and meanwhile, through the arrangement of the square nut and the second sealing ring, the sealing performance of the battery cell after liquid injection can be improved, the liquid leakage phenomenon is not easy to occur, and the service life of the battery cell is prolonged. And the performance and the safety of the battery cell are improved.

Description

Technical Field

[0001] This utility model relates to the field of lithium-ion batteries, and in particular to a liquid-filled square-shell battery cell. Background Technology

[0002] During the use of battery packs, the electrolyte inside the prismatic cells will be lost, resulting in a decrease in the capacity of the prismatic cells. A large part of the cell's low capacity, increased internal resistance, and reduced cycle life are due to electrolyte consumption. If the cells are simply used according to capacity and internal resistance, the utilization value of the power battery will be greatly reduced, and the life of the battery's secondary use will be shortened.

[0003] In the existing technology, the top cover of the square-shell battery cell is difficult to open after being laser-welded to the shell. At the same time, the liquid injection port of the top cover is also closed by welding with aluminum sealing nails, which cannot effectively seal after adding electrolyte, making it easy for liquid leakage to occur, affecting the performance and safety of the battery cell.

[0004] Therefore, we propose a liquid-filled square-shell battery cell to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a liquid-filled square-shell battery cell.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A liquid-filled square-shell battery cell includes a single battery cell, the top of which is provided with a top cover, and the top cover is provided with a liquid injection hole, and further includes:

[0008] A sealing pin is provided inside the injection hole, and a first sealing ring is provided at the bottom end of the sealing pin, with the first sealing ring located between the injection hole and the sealing pin;

[0009] A square nut is provided at the bottom end of the injection hole, and a sealing groove is provided on the square nut, with a second sealing ring disposed inside the sealing groove.

[0010] More preferably, the top cover has poles on both sides of the top end, and the injection hole is located between the poles.

[0011] More preferably, the bottom of the square nut is provided with a leakage block, the bottom of the leakage block is provided with a connection hole, and the bottom of the connection hole is inside the single cell.

[0012] More preferably, the leakage block has leakage holes at its four ends, and the leakage holes are symmetrically arranged with the connection hole as the center.

[0013] More preferably, the square nut has a fixing hole that penetrates the square nut, and the fixing hole is located inside the sealing groove.

[0014] More preferably, the sealing nail penetrates the top cover, the square nut, the second sealing ring, the fixing hole, the leakage block, and the connecting hole, and the bottom end of the sealing nail is flush with the bottom end face of the leakage block.

[0015] More preferably, the top surface of the second sealing ring and the top surface of the square nut are located on the same horizontal plane.

[0016] More preferably, the bottom surface of the square nut and the top surface of the leak block are both rectangular in shape, and the bottom surface of the square nut and the top surface of the leak block have the same shape.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0018] The top cover of the square-shell battery cell uses a bolt-fastened sealing method for the electrolyte injection port. When the electrolyte in the cell is low or almost dry, the fixing bolts can be loosened to inject electrolyte into the cell. At the same time, the square nut and the second sealing ring can improve the sealing performance of the cell after electrolyte injection, making it less likely to leak, thus improving the performance and safety of the cell. Attached Figure Description

[0019] Figure 1 This is an overall structural diagram of a liquid-filled square-shell battery cell proposed in this utility model;

[0020] Figure 2 This is an exploded structural diagram of a liquid-filled square-shell battery cell proposed in this utility model;

[0021] Figure 3 for Figure 2 Schematic diagram of a square nut structure;

[0022] Figure 4 for Figure 2 Schematic diagram of the leakage block structure.

[0023] In the diagram: 1. Single battery cell; 2. Top cover; 3. Terminal post; 4. Injection hole; 5. Sealing pin; 6. First sealing ring; 7. Square nut; 8. Leakage block; 9. Second sealing ring; 10. Sealing groove; 11. Fixing hole; 12. Leakage hole; 13. Connection hole. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0025] Reference Figure 1-4A liquid-filled square-shell battery cell includes a single battery cell 1, a top cover 2 at the top of the single battery cell 1, the top cover 2 sealing the top of the single battery cell 1, a core is placed inside the single battery cell 1 and the top cover 2 and the single battery cell 1 are welded together by welding, the top cover 2 is provided with a liquid injection hole 4, after the top cover 2 is welded, electrolyte is injected into the single battery cell 1 through the liquid injection hole 4.

[0026] The sealing pin 5 is located inside the injection hole 4. After the electrolyte is injected, the sealing pin 5 is inserted into the injection hole 4 to seal the injection hole 4 and prevent electrolyte leakage. The bottom end of the sealing pin 5 is provided with a first sealing ring 6. The first sealing ring 6 is located between the injection hole 4 and the sealing pin 5. The first sealing ring 6 seals the gap between the sealing pin 5 and the injection hole 4 to prevent electrolyte from seeping and leaking.

[0027] A square nut 7 is located at the bottom of the injection hole 4. A sealing groove 10 is provided on the square nut 7, and a second sealing ring 9 is provided inside the sealing groove 10. The injection port of the top cover 2 of the square-shell battery cell adopts a bolt-tight sealing method. When the electrolyte in the battery cell is low or almost dry, the fixing bolt can be loosened to inject electrolyte into the battery cell. At the same time, the square nut 7 and the second sealing ring 9 can improve the sealing performance of the battery cell after injection, making it less likely to leak, thus improving the performance and safety of the battery cell.

[0028] The top cover 2 has two pole posts 3 on both sides. The pole posts 3 are fixed to the top cover 2 by welding. The liquid injection hole 4 is located between the pole posts 3, and the top surface of the liquid injection hole 4 is lower than the top surface of the pole post 3, which facilitates the injection of electrolyte and saves space.

[0029] The bottom of the square nut 7 is provided with a drain block 8. The electrolyte entering from the square nut 7 is introduced into the interior of the individual cell 1 through the drain block 8. The bottom of the drain block 8 is provided with a connection hole 13. The bottom of the connection hole 13 is inside the individual cell 1. The connection hole 13 connects the fixing hole 11, the injection hole 4 and the interior of the individual cell 1, and is used to inject electrolyte.

[0030] The four ends of the leakage block 8 are provided with leakage holes 12. The leakage holes 12 are symmetrically arranged with the connection hole 13 as the center. The electrolyte injected through the injection hole 4 is injected into the individual cell 1 evenly and quickly through the leakage holes 12. By setting the leakage holes 12 symmetrically, the injection speed of the electrolyte can be accelerated. Electrolyte is prone to ignition when in contact with air for a long time, which can improve safety.

[0031] The sealing nail 5 passes through the top cover 2, the square nut 7, the second sealing ring 9, the fixing hole 11, the leakage block 8 and the connecting hole 13. The sealing nail 5 seals the square nut 7 and the leakage block 8. The bottom end of the sealing nail 5 is flush with the bottom end face of the leakage block 8, so that the bottom end of the sealing nail 5 will not protrude from the leakage block 8 and is not easy to contact the winding core inside the single cell 1, which can effectively reduce the risk of short circuit.

[0032] The top surface of the second sealing ring 9 and the top surface of the square nut 7 are on the same horizontal plane, so the second sealing ring 9 will not squeeze the top cover 2 plate and the square nut 7, which can improve the stability of the square nut 7 after it is fixed and prevent the square nut 7 from falling off the top cover 2.

[0033] The bottom surface of the square nut 7 and the top surface of the drain block 8 are both rectangular. Since the bottom surface of the square nut 7 and the top surface of the drain block 8 have the same shape, the bottom surface of the square nut 7 and the top surface of the drain block 8 occupy the same vertical space, which can save space.

Claims

1. A liquid-filled square-shell battery cell, comprising a single battery cell, wherein the top of the single battery cell is provided with a top cover, and the top cover is provided with a liquid injection hole, characterized in that, Also includes: A sealing pin is provided inside the injection hole, and a first sealing ring is provided at the bottom end of the sealing pin, with the first sealing ring located between the injection hole and the sealing pin; A square nut is provided at the bottom end of the injection hole, and a sealing groove is provided on the square nut, with a second sealing ring disposed inside the sealing groove.

2. The liquid-filled square-shell battery cell according to claim 1, characterized in that, The top cover has poles on both sides, and the injection hole is located between the poles.

3. A liquid-filled square-shell battery cell according to claim 1, characterized in that, The square nut has a leakage block at the bottom, and the leakage block has a connection hole at the bottom. The bottom of the connection hole is inside the individual battery cell.

4. A liquid-filled square-shell battery cell according to claim 3, characterized in that, The leakage block has leakage holes at its four ends, and the leakage holes are symmetrically arranged with the connection hole as the center.

5. A liquid-filled square-shell battery cell according to claim 1, characterized in that, The square nut has a fixing hole that penetrates through the square nut, and the fixing hole is located inside the sealing groove.

6. A liquid-filled square-shell battery cell according to claim 1, characterized in that, The sealing pin passes through the top cover, square nut, second sealing ring, fixing hole, leakage block and connecting hole, and the bottom end of the sealing pin is flush with the bottom end face of the leakage block.

7. A liquid-filled square-shell battery cell according to claim 1, characterized in that, The top surface of the second sealing ring and the top surface of the square nut are located on the same horizontal plane.

8. A liquid-filled square-shell battery cell according to claim 3, characterized in that, The bottom surface of the square nut and the top surface of the leak block are both rectangular in shape, and the bottom surface of the square nut and the top surface of the leak block have the same shape.

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