A positioning pressure relief and explosion-proof device for a soft-pack battery

Abstract

The present invention provides a positioning pressure relief and explosion-proof device for a soft-pack battery, belonging to the technical field of lithium battery safety devices. It solves the problems such as the inability to relieve pressure when the existing battery cells are inflated. A positioning pressure relief and explosion-proof device for a soft-pack battery includes an explosion-proof device body, which comprises an explosion-proof outer shell and an explosion-proof chip. The explosion-proof device body is provided with a top-sealing card slot for the top-sealing of the battery cell to be inserted. The explosion-proof chip is provided with a pointed head located on one side of the top-sealing card slot. The explosion-proof outer shell is provided with a flipping groove, and the flipping groove is used to turn the explosion-proof outer shell outwards, so that the pointed head is exposed and pierces the top-sealing area of the battery cell. The present invention has the advantages of good pressure relief effect and the like.

Description

Technical Field

[0001] The present invention belongs to the technical field of lithium battery safety devices, and particularly relates to a positioning pressure relief and explosion-proof device for a soft-pack battery. Background Art

[0002] Due to the advantages of high energy density, high output voltage, long cycle life, and low environmental pollution, lithium-ion batteries have been widely used in small digital electronic products and also have broad application prospects in fields such as electric vehicles and aerospace. The large-scale and high-energy development of lithium-ion battery packs is an inevitable trend in the development of lithium-ion batteries, but it is also the main obstacle to the development of lithium-ion batteries, among which the safety issue is becoming increasingly prominent.

[0003] After the battery is put into use, due to the user's usage method, the battery usage environment, or the reason of a single cell itself, individual cells may experience gas expansion. If the gas-expanded cell cannot be timely pressure-relieved in the designated area, it will more or less affect other cells and components, which may not only affect the service life of the entire battery but also pose a potential safety hazard. Summary of the Invention

[0004] The purpose of the present invention is to provide a positioning pressure relief and explosion-proof device for a soft-pack battery in view of the above problems existing in the prior art.

[0005] The purpose of the present invention can be achieved by the following technical solutions: A positioning pressure relief and explosion-proof device for a soft-pack battery, characterized in that it includes an explosion-proof device body, the explosion-proof device body includes an explosion-proof housing and an explosion-proof chip, the explosion-proof device body is provided with a top-sealing slot for the top-sealing of the battery cell to be inserted, the explosion-proof chip is provided with a pointed head on one side of the top-sealing slot, and the explosion-proof housing is provided with a flipping groove, and the flipping groove is used to turn the explosion-proof housing outwards so that the pointed head is exposed and pierces the top-sealing area of the battery cell.

[0006] The working principle of the present invention: During the use of the battery, individual cells experience gas expansion due to accidents. Due to the PACK method of stacking the cells in groups, the generated gas first accumulates at the loose top-sealing part, causing the top-sealing area to gradually expand. The battery cell uses an aluminum-plastic film for top-sealing.

[0007] Insert the top-sealing of the battery into the top-sealing slot. When the battery cell experiences gas expansion and the top-sealing area gradually expands, due to the existence of the flipping groove, the explosion-proof housing bends during the expansion of the top-sealing area and turns outwards towards the outside of the top-sealing area of the battery cell, while the explosion-proof chip remains in its original state without bending or flipping, so that the pointed head is exposed and can pierce the expanded top-sealing area, relieving the pressure in a sensitive and timely manner.

[0008] The present invention not only has an obvious pressure relief effect, but also is very convenient to fix with the battery cell and will not accidentally damage the battery cell.

[0009] In the above-mentioned positioning pressure relief and explosion-proof device for a soft-pack battery, the explosion-proof housing is provided with a first card slot for inserting an explosion-proof chip, and both sides of the first card slot are provided with second card slots that are perpendicular and communicated with the second card slot.

[0010] In the above-mentioned positioning pressure relief and explosion-proof device for a soft-pack battery, the explosion-proof chip includes a first vertical rod and a second vertical rod. The first vertical rod and the second vertical rod are connected by a cross bar. The pointed head is located at the end of the first vertical rod. There is a gap between the first vertical rod and the second vertical rod. When the explosion-proof chip is inserted, a top-sealing card slot is formed between the gap and the second card slot.

[0011] In the above-mentioned positioning pressure relief and explosion-proof device for a soft-pack battery, both sides of the explosion-proof housing are provided with openings communicated with the second card slot. The flipping groove is located on one side of the explosion-proof housing and is communicated with the opening.

[0012] In the above-mentioned positioning pressure relief and explosion-proof device for a soft-pack battery, the explosion-proof housing is provided with an insertion end. The explosion-proof chip is inserted from the insertion end, and the cell top-seal is inserted from the insertion end. The flipping groove is close to the insertion end. After the explosion-proof chip is inserted into the explosion-proof housing, the pointed head is located in the first card slot. The pointed head is on the same side as the flipping groove and the pointed head faces outward.

[0013] In the above-mentioned positioning pressure relief and explosion-proof device for a soft-pack battery, the bottom of the top-sealing card slot is provided with an adhesive layer for fixing with the cell top-seal.

[0014] In the above-mentioned positioning pressure relief and explosion-proof device for a soft-pack battery, the explosion-proof chip is made of metal.

[0015] In the above-mentioned positioning pressure relief and explosion-proof device for a soft-pack battery, the explosion-proof housing is made of soft rubber with a hardness of 50-100P.

[0016] In the above-mentioned positioning pressure relief and explosion-proof device for a soft-pack battery, the number of the flipping grooves is 2.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] 1. The present invention not only has an obvious pressure relief effect, but also is very convenient to fix with the cell and will not accidentally damage the cell. Description of the Drawings

[0019] Figure 1 is a schematic structural diagram of the present invention;

[0020] Figure 2 is a schematic structural diagram of the explosion-proof housing of the present invention;

[0021] Figure 3 It is a schematic structural diagram of the explosion-proof chip of the present invention;

[0022] Figure 4 It is a schematic top view structure diagram of the present invention;

[0023] Figure 5 It is a schematic structural diagram of one side of the present invention with a flipping groove;

[0024] Figure 6 It is a schematic structural diagram of one side of the present invention without a flipping groove.

[0025] In the figure, 1. explosion-proof device body; 2. top-sealing card slot; 3. pointed head; 4. flipping groove; 5. explosion-proof shell; 6. explosion-proof chip; 7. first card slot; 8. second card slot; 9. first vertical rod; 10. second vertical rod; 11. cross bar; 12. gap; 13. opening; 14. insertion end; 15. adhesive layer. Specific Embodiments

[0026] The following are specific embodiments of the present invention and in combination with the accompanying drawings, the technical solutions of the present invention are further described, but the present invention is not limited to these embodiments.

[0027] As Figure 1-6 shown, a positioning pressure-relief explosion-proof device for a soft-pack battery includes an explosion-proof device body 1. The explosion-proof device body 1 includes an explosion-proof shell 5 and an explosion-proof chip 6. The explosion-proof device body 1 is provided with a top-sealing card slot 2 for the top-sealing insertion of the battery cell. The explosion-proof chip 6 is provided with a pointed head 3 on one side of the top-sealing card slot 2. The explosion-proof shell 5 is provided with a flipping groove 4. The flipping groove 4 is used to turn the explosion-proof shell 5 outwards, so that the pointed head 3 pierces the top-sealing area of the battery cell.

[0028] Further details are as follows. The explosion-proof shell 5 is provided with a first card slot 7 for inserting the explosion-proof chip 6. Both sides of the first card slot 7 are provided with second card slots 8 that are perpendicular and communicate with the second card slot 8. The first card slot 7 is used to embed the explosion-proof chip 6. The second card slot 8 is perpendicular and communicates with the first card slot 7. The first card slot 7 and the second card slot 8 form a cross-shaped cavity. The flipping groove 4 communicates with both the first card slot 7 and the second card slot 8.

[0029] Further details are as follows. The explosion-proof chip 6 includes a first vertical rod 9 and a second vertical rod 10. The first vertical rod 9 and the second vertical rod 10 are connected by a cross bar 11. The pointed head 3 is located at the end of the first vertical rod 9. There is a gap 12 between the first vertical rod 9 and the second vertical rod 10. When the explosion-proof chip 6 is inserted, a top-sealing card slot 2 is formed between the gap 12 and the second card slot 8. The explosion-proof chip 6 is U-shaped. The end of the first vertical rod 9 has a sharp pointed head 3. After the explosion-proof chip 6 is inserted, the pointed head 3 faces outwards. The gap 12 between the first vertical rod 9 and the second vertical rod 10 cooperates with the second card slot 8 to form a top-sealing card slot 2, so that the top-sealing of the battery cell can be inserted from the top-sealing card slot 2.

[0030] Specifically, openings 13 communicating with the second card slot 8 are provided on both side surfaces of the explosion-proof housing 5. The flipping groove 4 is located on one side surface of the explosion-proof housing 5 and communicates with the opening 13. The purpose of the communication between the flipping groove 4 and the opening 13 is to facilitate the outward flipping of the explosion-proof device body 1 when the top-sealing area expands.

[0031] Specifically, the explosion-proof housing 5 is provided with an insertion end 14. The explosion-proof chip 6 is inserted from the insertion end 14, and the cell top-sealing is inserted from the insertion end 14. The flipping groove 4 is close to the insertion end 14. After the explosion-proof chip 6 is inserted into the explosion-proof housing 5, the pointed head 3 is located in the first card slot 7. The top of the pointed head 3 is about 2 mm lower than the surface of the insertion end, and the top of the pointed head 3 is about 2 mm away from the side wall of the second card slot 8. The pointed head 3 is on the same side as the flipping groove 4 and the pointed head 3 faces outward. When the cell is operating normally, the pointed head 3 is hidden inside the explosion-proof housing 5 and will not cause the pointed head 3 to cut through the top-sealing area of the cell or other components due to impact or other factors. During the installation of the present invention, the pointed head 3 will not cut through the top-sealing area of the cell either. When the cell expands due to gas inflation, due to the expansion of the cell top-sealing area, the flipping groove 4 is close to the insertion end 14, causing the side of the insertion end 14 of the explosion-proof housing 5 with the flipping groove to bend outward and flip outward, exposing the pointed head 3. When the cell top-sealing area continues to expand, the pointed head 3 will pierce the top-sealing area to achieve the purpose of pressure relief.

[0032] Specifically, a paste layer 15 for fixing with the cell top-sealing is provided at the bottom of the top-sealing card slot 2. The paste layer 15 is used to fix the bottom of the top-sealing card slot 2 and the top-sealing area together. The paste layer 15 can be made of a fixing glue, and this fixing glue can be selected as a strong glue with organic affinity, such as AB glue.

[0033] Specifically, the explosion-proof chip 6 is made of metal.

[0034] Specifically, the explosion-proof housing 5 is made of a soft glue with a hardness of 50 - 100P. The hardness of the explosion-proof housing 5 must be controlled between 50 - 100P. Being too soft or too hard will cause it to be unable to flip outward or the flipping to fail, and the pointed head 3 cannot pierce the top-sealing area.

[0035] Specifically, the number of the flipping grooves 4 is 2.

[0036] The present invention mainly includes two parts: an explosion-proof housing 5 and an explosion-proof chip 6. The explosion-proof housing 5 has a cross-shaped cavity from one end to the interior, which are the first card slot 7 and the second card slot 8 respectively. The first card slot 7 is used to embed the explosion-proof chip 6; there are two flipping slots 4 inside the cross-shaped cavity near the insertion end 14. Due to the existence of the flipping slots 4, when the battery cell expands to a certain extent, the explosion-proof housing 5 can bend and turn outwards; the material of the explosion-proof housing 5 is a soft rubber with a moderate hardness (50-100P). The explosion-proof chip 6 is similar to a U-shaped metal sheet, and one end has a sharp pointed corner, that is, the pointed tip 3 is located at the end of the first vertical rod 9. When the explosion-proof chip 6 is embedded in the explosion-proof housing 5, the pointed tip 3 faces outwards, and the pointed tip 3 is on the same side as the flipping slot 4. The material of the explosion-proof chip 6 is metal. After the explosion-proof chip 6 is embedded in the explosion-proof housing 5, the gap 12 between the first vertical rod 9 and the second vertical rod 10 and the second card slot 8 together form a top-sealing card slot 2. The top-sealing card slot 2 needs to be stuck at the top-sealing part of the battery cell. The bottom of the top-sealing card slot 2 seals the head of the top-sealing area, and the bottom of the top-sealing card slot 2 and the top-sealing area can be fixed together with an adhesive layer 15. The adhesive layer 15 can be made of a fixing glue, and this fixing glue can be selected as a strong glue with organic affinity, such as AB glue.

[0037] During the use of the battery, when an individual battery cell expands due to an accident, due to the PACK method of grouping and stacking the battery cells, the generated gas will first gather in the loose top-sealing area. As the top-sealing area slowly expands, since the flipping slot 4 is close to the insertion end 14 and on the same side as the pointed tip 3, the side of the insertion end 14 with the flipping slot will turn outwards. And the explosion-proof chip 6 made of metal will not bend or turn over. Due to the outward turning of one side of the insertion end 14 of the explosion-proof housing 5, the pointed tip 3 of the explosion-proof chip 6 is exposed, and the pointed tip 3 can easily pierce the aluminum-plastic film at the bulged top-sealing part, with sensitive reaction and timely pressure relief. In addition, the structural dimensions of the explosion-proof housing 5 and the explosion-proof chip 6 of the present invention should be reasonably adjusted in combination with the size of the top-sealing area of the battery cell to be used and the PACK assembly situation.

[0038] In summary, the present invention not only has an obvious pressure relief effect, but also is very convenient to fix with the battery cell and will not accidentally damage the battery cell; the control of the size of the present invention can also ensure that it does not affect the PACK assembly. Moreover, the structure of the present invention is simple and easy to produce and assemble, and the batch production cost is also very low, which can be well popularized and promoted.

[0039] The specific embodiments described herein are only illustrative of the spirit of the present invention. Those skilled in the art of the present invention can make various modifications or supplements to the described specific embodiments or use similar methods to replace them. For example, changing the materials of the explosion-proof housing 5 and the explosion-proof chip 6, changing the size ratio of the explosion-proof housing 5 and the explosion-proof chip 6, or even making simple changes to the internal structure of the explosion-proof housing 5 and the external structure of the explosion-proof chip 6. However, it will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0040] Although terms such as explosion-proof device body 1, top-sealing card slot 2, pointed tip 3, flipping slot 4, explosion-proof housing 5, explosion-proof chip 6, first card slot 7, second card slot 8, first vertical rod 9, second vertical rod 10, cross bar 11, gap 12, opening 13, insertion end 14, etc. are used more frequently in this article, the possibility of using other terms is not excluded. The use of these terms is only to more conveniently describe and explain the essence of the present invention; interpreting them as any kind of additional limitation is contrary to the spirit of the present invention.

Claims

1. A positioning pressure relief and explosion-proof device for a soft-pack battery, characterized in that It includes an explosion-proof device body (1). The explosion-proof device body (1) includes an explosion-proof housing (5) and an explosion-proof chip (6). The explosion-proof device body (1) is provided with a top-sealing card slot (2) for the top-sealing insertion of the power supply core. The explosion-proof chip (6) is provided with a pointed head (3) located on one side of the top-sealing card slot (2). The explosion-proof housing (5) is provided with a flipping groove (4). The flipping groove (4) is used to turn the explosion-proof housing (5) outwards, so that the pointed head (3) is exposed and pierces the top-sealing area of the core. The explosion-proof housing (5) is provided with a first card slot (7) for the explosion-proof chip (6) to be inserted. Both sides of the first card slot (7) are provided with second card slots (8) perpendicular to and communicating with the second card slots (8). The explosion-proof chip (6) includes a first vertical rod (9) and a second vertical rod (10). The first vertical rod (9) and the second vertical rod (10) are connected by a cross bar (11). The pointed head (3) is located at the end of the first vertical rod (9). There is a gap (12) between the first vertical rod (9) and the second vertical rod (10). When the explosion-proof chip (6) is inserted, a top-sealing card slot (2) is formed between the gap (12) and the second card slot (8). Both sides of the explosion-proof housing (5) are provided with openings (13) communicating with the second card slots (8). The flipping groove (4) is located on one side of the explosion-proof housing (5) and communicates with the opening (13). The explosion-proof housing (5) is provided with an insertion end (14). The explosion-proof chip (6) is inserted from the insertion end (14), and the top-sealing of the core is inserted from the insertion end (14). The flipping groove (4) is close to the insertion end (14). After the explosion-proof chip (6) is inserted into the explosion-proof housing (5), the pointed head (3) is located in the first card slot (7). The pointed head (3) is on the same side as the flipping groove (4), and the pointed head (3) faces outwards. The bottom of the top-sealing card slot (2) is provided with an adhesive layer (15) for fixing with the top-sealing of the core. The explosion-proof chip (6) is made of metal. The explosion-proof housing (5) is made of soft rubber with a hardness of 50 - 100P. The number of the flipping grooves (4) is 2.

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