Battery cover plate with explosion-proof pole

Abstract

The utility model relates to a battery cover plate with an explosion-proof pole, which comprises a riveting block, an upper insulating part, a base plate and the explosion-proof pole, the upper insulating part is arranged between the riveting block and the base plate, the explosion-proof pole sequentially penetrates through the base plate, the upper insulating part and the riveting block, the explosion-proof pole is provided with a pressure relief hole extending along the height direction of the explosion-proof pole, and the pressure relief hole is communicated with the riveting block. A pressure relief hole is formed in the battery body, a pressure relief piece for shielding the pressure relief hole is arranged in the pressure relief hole, the pressure relief piece is provided with an anti-explosion nick, and the anti-explosion nick can be broken under the action of pressure, so that the interior of the battery is communicated with the exterior through the pressure relief hole. The battery cover plate with the explosion-proof pole disclosed by the utility model is simple in structure and low in cost, and can effectively ensure that the nick of the explosion-proof pole can be broken and opened when the air pressure in the battery is increased, so that the air pressure in the battery is discharged in time, and the battery is prevented from exploding.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy battery manufacturing, and in particular to a battery cover with an explosion-proof pole. Background Art

[0002] When the temperature inside the battery of a new energy vehicle is too high or the pressure is too high, the battery will undergo an internal chemical reaction, which will then produce gas, causing the pressure inside the battery to continue to increase. This will cause the pressure inside the battery to be too high, causing damage to the battery. In the most serious cases, it will cause the battery to explode. In order to avoid this from happening, a battery explosion-proof valve is installed in the battery of a new energy vehicle. The function of the battery explosion-proof valve is to disperse the pressure generated inside the battery to the outside world, thereby ensuring the safety of the battery. At present, the common process of welding an explosion-proof valve on the top cover of a battery explosion-proof valve is a process. However, the welding process is prone to produce defects such as cold welding and welding holes, the production cost is high, and laser welding will affect the stability of the explosion pressure value of the explosion-proof valve. Utility Model Content

[0003] The utility model aims to provide a battery cover with an explosion-proof pole, which simplifies the production process, improves production efficiency and reduces production costs by integrating the pole with the explosion-proof valve sheet.

[0004] A battery cover with an explosion-proof pole comprises a riveted block, an upper insulating member, a substrate, and an explosion-proof pole, wherein the upper insulating member is arranged between the riveted block and the substrate, the explosion-proof pole is provided with a pressure relief hole extending along its height direction, a pressure relief sheet for covering the pressure relief hole is arranged in the pressure relief hole, the pressure relief sheet has an explosion-proof notch, and the explosion-proof notch can be ruptured under pressure so that the inside of the battery is connected to the outside through the pressure relief hole.

[0005] In the above technical solution, by integrating the pole and the explosion-proof valve sheet, and replacing the explosion-proof valve welding with pole riveting, when the pressure inside the battery suddenly increases or the temperature rises rapidly, the pressure relief sheet of the explosion-proof pole can evenly bear the pressure and rupture along the explosion-proof notch, and open outward as a whole, so that the internal air pressure of the battery can be discharged in time, thereby avoiding or reducing the explosion, and effectively preventing the battery from exploding. Ingeniously integrating the explosion-proof valve structure design with a pressure relief function into the pole can not only save the structural space of the substrate, but also simplify the production process, improve production efficiency, and thus reduce production costs.

[0006] Furthermore, the explosion-proof notch is annular and coaxial with the center of the pressure relief hole.

[0007] In the above technical solution, the explosion-proof notch is annular and coaxial with the center of the pressure relief hole, so that the pressure is concentrated on the explosion-proof notch. After the explosion-proof notch is forced to rupture, the entire pressure relief plate will bounce outward, and the high-pressure gas can be directly discharged from the bottom of the explosion-proof pole, thereby avoiding the explosion of the battery.

[0008] Furthermore, the explosion-proof pole is provided with a limiting groove, and a ring-shaped boss is provided at the connection between the riveting block and the explosion-proof pole, and the ring-shaped boss is sleeved on the limiting groove.

[0009] In the above technical solution, the riveting block is provided with an annular boss and the explosion-proof pole is provided with a limiting groove, so that the connection between the riveting block and the explosion-proof pole is more tight and reliable, and the explosion-proof pole is prevented from sliding off when the pressure is released.

[0010] Furthermore, a connector is provided at one end of the explosion-proof pole away from the riveting block, the connector is connected to the explosion-proof pole, the connector is provided with a connecting hole, the explosion-proof pole includes a bottom plate, and the height of the connecting hole matches the height of the bottom plate.

[0011] In the above technical solution, the height of the connecting hole matches the height of the bottom plate of the explosion-proof pole, ensuring that the bottom surface of the connector and the bottom surface of the explosion-proof pole are located in the same plane. When the battery is depressurized, the high-pressure gas is discharged along the bottom surface of the explosion-proof pole, preventing the pressure relief plate fragments from damaging other electrical components.

[0012] Furthermore, the connecting piece includes a pole lug connecting portion and a pole post connecting portion, one end of the pole post connecting portion is connected to the explosion-proof pole, and the other end of the pole post connecting portion is connected to the pole lug connecting portion.

[0013] In the above technical solution, one end of the pole connecting part is connected to the battery pole, and the other end is connected to the pole lug connecting part, and the pole lug connecting part is connected to the pole lug outside the battery, ensuring that the connector connects the pole lugs of each battery pack to the pole of a single battery, so that a single battery has a unified external electrode, thereby improving the load capacity of the battery pack.

[0014] Furthermore, it also includes a lower insulating member, which is arranged between the connecting member and the substrate.

[0015] In the above technical solution, a lower insulating member is arranged between the connecting member and the substrate so that the connecting member and the substrate are insulated from each other, thereby improving the battery performance.

[0016] Furthermore, the lower insulating member is provided with a plurality of extension portions, and the extension portions abut against the outer periphery of the connecting member.

[0017] In the above technical solution, the extension part abuts against the outer periphery of the connector, which can support the connector to prevent the connector from sinking when the explosion-proof pole is connected to the riveted block; and to prevent the connector from falling off due to the residual force when the battery is depressurized.

[0018] Furthermore, it also includes a sealing ring, which is sleeved on the outer circumference of the explosion-proof pole.

[0019] In the above technical solution, the sealing ring is arranged on the outer periphery of the explosion-proof pole to prevent the leakage of the electrolyte, ensure that the battery has good sealing, and provide a good closed environment for the internal reaction of the battery.

[0020] Compared with the prior art, the utility model has the following beneficial effects: by integrating the pole and the explosion-proof valve sheet, and replacing the explosion-proof valve welding with pole riveting, when the pressure inside the battery suddenly increases or the temperature rises rapidly, the pressure relief sheet of the explosion-proof pole can evenly bear the pressure and rupture along the explosion-proof notch, and open outward as a whole, so that the internal gas pressure of the battery can be discharged in time, thereby avoiding or reducing the explosion, and playing an effective role in preventing the battery from exploding. Ingeniously integrating the explosion-proof valve structure design with a pressure relief function into the pole can not only save the structural space of the substrate, but also simplify the production process, improve production efficiency, and thus reduce production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The figure is a cross-sectional schematic diagram of a battery cover with explosion-proof poles according to an embodiment of the utility model.

[0022] Figure 2 The figure is a schematic top view of the explosion-proof pole of the battery cover with the explosion-proof pole according to an embodiment of the utility model.

[0023] Figure 3 It is a schematic diagram of the front structural view of the explosion-proof pole of the battery cover with explosion-proof pole according to an embodiment of the utility model.

[0024] Figure 4 The present invention is a schematic structural diagram of a riveted block of a battery cover with an explosion-proof pole according to an embodiment of the present invention.

[0025] Figure 5 The figure is a schematic structural diagram of a battery cover with explosion-proof poles according to an embodiment of the utility model.

[0026] Figure 6 The figure is a schematic diagram of the exploded structure of a battery cover with explosion-proof poles according to an embodiment of the utility model.

[0027] Description of Figure Numbers

[0028] Riveting block 1, annular boss 101, upper insulating part 2, base plate 3, explosion-proof pole 4, pressure relief hole 401, cavity 402, pressure relief sheet 403, explosion-proof notch 404, limiting groove 405, bottom plate 406, connecting part 5, connecting hole 501, pole ear connecting part 502, pole connecting part 503, lower insulating part 6, extension part 601, sealing ring 7. DETAILED DESCRIPTION

[0029] The battery cover with explosion-proof pole of the utility model will be further described in detail below in combination with specific embodiments and drawings. The drawings show a preferred embodiment of the utility model. However, the utility model can be implemented in many different forms and is not limited to the embodiments described herein.

[0030] Please refer to Figures 1 to 3 In a preferred embodiment, the battery cover with explosion-proof pole of the utility model comprises a riveted block 1, an upper insulating member 2, a substrate 3, and an explosion-proof pole 4, the upper insulating member 2 is arranged between the riveted block 1 and the substrate 3, the explosion-proof pole 4 is sequentially penetrated through the substrate 3, the upper insulating member 2, and the riveted block 1, the explosion-proof pole 4 is provided with a pressure relief hole 401 extending along its height direction, the pressure relief hole 401 is provided with a pressure relief sheet 403 for covering the pressure relief hole, the pressure relief sheet 403 has an explosion-proof notch 404, and the explosion-proof notch 404 can be ruptured under pressure to allow the interior of the battery to communicate with the outside through the pressure relief hole 401.

[0031] It can be seen from the above technical solution that by arranging the pole and the explosion-proof valve sheet in one body, and using pole riveting instead of explosion-proof valve welding, when the pressure inside the battery suddenly increases or the temperature rises rapidly, the pressure relief sheet 403 of the explosion-proof pole 4 can evenly bear the pressure and rupture along the explosion-proof notch 404, and open outward as a whole, so that the internal air pressure of the battery can be discharged in time, thereby avoiding or reducing the explosion, and playing an effective role in preventing the battery from exploding. Ingeniously integrating the explosion-proof valve structure design with a pressure relief function into the pole can not only save the structural space of the substrate, but also simplify the production process, improve production efficiency, and thus reduce production costs.

[0032] It should be noted that only one of the positive and negative poles needs to be set as an explosion-proof pole. For example, the utility model sets the positive pole as an explosion-proof pole. When the internal gas pressure of the battery increases, the explosion-proof notch of the positive pole breaks open, so that the internal gas pressure of the battery is discharged in time to prevent the battery from exploding.

[0033] Specifically, the explosion-proof notch 404 is annular and coaxial with the center of the pressure relief hole 401. The explosion-proof notch 404 is annular and coaxial with the center of the pressure relief hole 401, so that the stress can be concentrated on the explosion-proof notch 404. When the gas reaches the critical value of the explosion-proof point, the explosion-proof notch 404 ruptures, and the explosion-proof pole 4 can be instantly connected to the outside world, achieving the purpose of pressure relief, and preventing the fragments of the pressure relief sheet 403 from damaging other electrical components and causing secondary damage.

[0034] The shape of the explosion-proof notch 404 can be circular, semicircular, triangular or trapezoidal, but is not limited thereto, and can also be other closed linear shapes known to those skilled in the art. Exemplarily, the explosion-proof notch 404 of the utility model is a circular groove with depth. When the gas reaches the critical value of the explosion-proof point, the explosion-proof notch 404 ruptures and the pressure relief plate is ejected outward to directly dissipate the internal high-pressure gas.

[0035] Please refer to Figure 2 The explosion-proof notch 404 extends along the circumference of the bottom of the cavity 402. The explosion-proof notch 404 extends along the circumference of the bottom of the cavity 402 so that after the pressure forces the explosion-proof notch 404 to rupture, the entire pressure relief sheet 403 pops open outward, and the high-pressure gas can be directly discharged from the bottom of the explosion-proof pole 4, thereby avoiding the explosion of the battery.

[0036] In specific implementation, the predetermined pressure required for the pressure relief sheet 403 to tear needs to be set according to the predicted range of pressure values ​​caused by overheating inside the battery, that is, the explosion-proof notch 404 on the pressure relief sheet 403 and the material and thickness of the pressure relief sheet 403 are determined by the internal pressure of the battery in a dangerous state. When the internal pressure of the battery increases, the pressure relief sheet 403 as a whole first expands and deforms outward to relieve the increase in internal pressure, and stress concentration occurs at the explosion-proof notch 404. When the pressure relief sheet 403 is further deformed due to the further increase in the internal pressure of the battery, the explosion-proof notch 404 is torn and pressure is released due to stress concentration, thereby avoiding battery explosion.

[0037] Furthermore, the explosion-proof pole 4 is provided with a limiting groove 405, and the connection between the riveting block 1 and the explosion-proof pole 4 is provided with an annular boss 101, and the annular boss 101 is sleeved with the limiting groove 405. The explosion-proof pole 4 is provided with a limiting groove 405, and the riveting block 1 is provided with an annular boss 101, so that the connection between the riveting block 1 and the explosion-proof pole 4 is more tight and reliable, which can not only prevent the explosion-proof pole 4 from slipping when the riveting block 1 is welded with the explosion-proof pole 4, but also prevent the explosion-proof pole 4 from falling off due to the rebound of the pressure relief sheet 403 when the battery is depressurized.

[0038] Please refer to Figure 1 and Figure 5The end of the explosion-proof pole 4 away from the riveting block 1 is provided with a connector 5, which is connected to the explosion-proof pole 4, and the connector 5 is provided with a connecting hole 501. The explosion-proof pole 4 includes a bottom plate 406, and the height of the connecting hole 5 matches the height of the bottom plate 406. The height of the connecting hole 5 matches the height of the bottom plate 406 of the explosion-proof pole, ensuring that the bottom surface of the connector 5 and the bottom surface of the explosion-proof pole 4 are located in the same plane. When the battery is depressurized, the high-pressure gas is discharged along the bottom surface of the explosion-proof pole 4, preventing the fragments of the pressure relief sheet 403 from damaging other electrical components.

[0039] The connector 5 includes a lug connector 502 and a pole connector 503. One end of the lug connector 502 is connected to the lug of the battery pack, and one end of the pole connector 503 is connected to the pole of the battery cover. The connector 5 connects the lugs of each battery pack to the pole of a single battery, so that the single battery has a unified external electrode, which can improve the load capacity of the battery pack and facilitate the assembly of the battery pack. The connector 5 of the utility model is a plate-shaped metal with a relatively thin thickness. The connector 5 is easily deformed by force. One side of the pole connector 503 is in the same plane as the side where the pressure relief sheet 403 is located, which can prevent the connector 5 from being deformed by force during pressure relief, thereby causing interference between the lug connector 502 and the lug of the battery pack, thereby affecting the assembly of the battery.

[0040] Please refer to Figure 5 The utility model further includes a lower insulating member 6, which is disposed between the connecting member 5 and the substrate 3. The lower insulating member 6 is disposed between the connecting member 5 and the substrate 3 so that the connecting member 5 and the substrate 3 are insulated from each other, thereby improving the battery performance.

[0041] At the same time, the lower insulating member 6 is also provided with a plurality of extensions 601, which abut against the outer periphery of the connector 5. The extensions 601 abut against the outer periphery of the connector 5, which can support the connector 5 on the one hand to prevent the connector 5 from sinking due to external force when the explosion-proof pole 4 is connected to the riveted block 1; on the other hand, it can prevent the connector 5 from falling off due to residual force when the battery is depressurized.

[0042] Furthermore, the utility model also includes a sealing ring 7, which is sleeved on the outer periphery of the explosion-proof pole 4. The sealing ring 7 is sleeved on the outer periphery of the explosion-proof pole 4 to prevent leakage of the electrolyte, ensure that the battery has good sealing, and provide a good closed environment for the internal reaction of the battery.

[0043] With the development of economy and technology, new energy vehicles have become an emerging industry that has attracted much attention in the automotive industry. It not only meets people's pursuit of energy conservation and environmental protection, but also reduces people's expenses for using gasoline vehicles. However, judging from the actual situation in the current market, the explosion-proof problem of batteries in new energy vehicles is still a pain point that plagues this industry. Therefore, how to ensure the safety of batteries in new energy vehicles and avoid the occurrence of safety accidents such as battery explosions has become an issue that this industry needs to focus on. The battery cover with explosion-proof poles of the utility model has a simple structure and low cost. When the internal air pressure of the battery increases, it can effectively ensure that the notch of the explosion-proof pole can be broken open, so that the internal air pressure of the battery can be discharged in time to prevent the battery from exploding.

[0044] In the description of the present invention, it should be understood that terms such as "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0045] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0046] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] Although the utility model is described in conjunction with the above specific embodiments, it is obvious that those skilled in the art can make many substitutions, modifications and changes based on the above content. Therefore, all such substitutions, improvements and changes are included in the spirit and scope of the appended claims.

Claims

1. A battery cover with explosion-proof poles, characterized in that: The invention comprises a riveted block, an upper insulating member, a substrate, and an explosion-proof pole, wherein the upper insulating member is arranged between the riveted block and the substrate, and the explosion-proof pole is sequentially penetrated through the substrate, the upper insulating member, and the riveted block, and the explosion-proof pole is provided with a pressure relief hole extending along its height direction, and a pressure relief sheet for covering the pressure relief hole is arranged in the pressure relief hole, and the pressure relief sheet has an explosion-proof notch, and the explosion-proof notch can be ruptured under pressure so that the inside of the battery is connected with the outside through the pressure relief hole.

2. The battery cover with explosion-proof pole according to claim 1, characterized in that: The explosion-proof notch is annular and coaxial with the center of the pressure relief hole.

3. The battery cover with explosion-proof pole according to claim 1, characterized in that: The explosion-proof pole is provided with a limiting groove, and the connection between the riveting block and the explosion-proof pole is provided with an annular boss, and the annular boss is sleeved with the limiting groove.

4. The battery cover with explosion-proof pole according to claim 1, characterized in that: A connecting piece is provided at one end of the explosion-proof pole away from the riveting block, and the connecting piece is provided with a connecting hole. The explosion-proof pole includes a bottom plate, and the height of the connecting hole matches the height of the bottom plate.

5. The battery cover with explosion-proof pole according to claim 4, characterized in that: The connecting piece comprises a pole lug connecting portion and a pole post connecting portion, one end of the pole post connecting portion is connected to the explosion-proof pole, and the other end of the pole post connecting portion is connected to the pole lug connecting portion.

6. The battery cover with explosion-proof pole according to claim 4, characterized in that: It also includes a lower insulating member, which is arranged between the connecting member and the substrate.

7. The battery cover with explosion-proof pole according to claim 6, characterized in that: The lower insulating member is provided with a plurality of extension portions, and the extension portions abut against the outer periphery of the connecting member.

8. The battery cover with explosion-proof pole according to claim 1, characterized in that: It also includes a sealing ring, which is sleeved on the outer periphery of the explosion-proof pole.

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