Battery cover plate and battery
By incorporating a buffer plate and staggered pressure relief and buffer hole structures in the battery cover, the residence time of fluid within the explosion-proof space is extended, thus solving the problem of unstable explosion-proof pressure in the battery cover and improving battery safety.
Patent Information
- Application Number
- CN202422936283.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-28
- Publication Date
- 2025-12-09
- Estimated Expiration
- 2034-11-28
AI Technical Summary
The existing battery cover has unstable explosion-proof pressure, resulting in low battery safety, especially prone to explosion during overcharging, collisions, and hot box testing.
A battery cover plate is designed, including a base plate, a peripheral wall plate, a buffer plate, an explosion-proof membrane, and a puncture component. By setting the buffer plate, the explosion-proof cavity is divided into first and second explosion-proof spaces, and the pressure relief hole is staggered from the buffer hole. The fluid first enters the second explosion-proof space and then exits, prolonging the fluid's residence time in the space to stabilize the air pressure.
It effectively stabilizes the explosion-proof pressure of the battery cover, avoids the risk of battery explosion, and improves the safety of battery use.
Smart Images
Figure CN223651576U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to battery technology field, especially a kind of battery cover plate and battery. BACKGROUND
[0002] Cylindrical battery under the following abuse, for example, excessive charging, collision and hot box test, cylindrical battery inside will quickly accumulate a large amount of heat and gas, resulting in internal pressure increase, if there is no pressure relief port, serious will lead to the expansion and explosion of cylindrical battery.
[0003] For safety considerations, an explosion-proof valve is usually provided on the cylindrical battery cover plate, and a rupture disc is provided in the explosion-proof valve. When the internal pressure reaches the opening pressure of the rupture disc, the internal pressure is released from the explosion-proof valve, thereby avoiding dangerous accidents such as explosion due to excessive internal pressure. The explosion pressure of the existing battery cover plate is unstable, which has a greater impact on the safety of the battery. SUMMARY
[0004] The utility model aims at at least one of the technical problems existing in the prior art. To this end, the utility model provides a battery cover plate, which can ensure the stability of the explosion pressure of the battery cover plate to improve the use safety of the battery.
[0005] The utility model further provides a battery with the above-mentioned battery cover plate.
[0006] According to the battery cover plate of the first aspect embodiment of the utility model, comprising:
[0007] The bottom plate is provided with an explosion-proof hole;
[0008] The peripheral wall plate is arranged around the outer periphery of the explosion-proof hole along the axial direction of the explosion-proof hole, and one end of the peripheral wall plate away from the bottom plate is provided with a sealing plate. The bottom plate, the peripheral wall plate and the sealing plate form an explosion-proof cavity. The peripheral wall plate is provided with a pressure relief hole communicating with the explosion-proof cavity;
[0009] The buffer plate is arranged in the explosion-proof cavity along the axial direction of the explosion-proof hole, and the buffer plate is arranged around the outer periphery of the explosion-proof hole to separate the explosion-proof cavity into a first explosion-proof space and a second explosion-proof space. The buffer plate is provided with a buffer hole, and the first explosion-proof space communicates with the second explosion-proof space through the buffer hole. The pressure relief hole and the buffer hole are staggered along the circumferential direction of the peripheral wall plate;
[0010] The explosion-proof membrane is arranged on the bottom plate and covers the explosion-proof hole;
[0011] The piercing member is arranged on one side of the sealing plate facing the explosion-proof membrane, and the piercing member is used to pierce the explosion-proof membrane when the explosion-proof membrane is inflated.
[0012] The battery cover according to the first aspect of the present invention has at least the following beneficial effects:
[0013] By incorporating a buffer plate, when the pressure inside the battery becomes too high, the explosion-proof membrane bulges, causing it to be punctured by a puncture device. The fluid inside the battery then enters the first explosion-proof space through the explosion-proof hole. Subsequently, the fluid enters the second explosion-proof space through the buffer hole and is then discharged to the outside through the pressure relief hole. Because the pressure relief hole and the buffer hole are staggered along the circumference of the peripheral wall plate, the fluid flowing into the second explosion-proof space from the buffer hole needs to remain in the second explosion-proof space for a certain period of time. The air pressure in the second explosion-proof space gradually decreases before the fluid can be discharged to the outside through the pressure relief hole. This ensures the stability of the explosion-proof pressure of the battery cover, avoiding the risk of battery explosion and thus improving the safety of battery use.
[0014] According to some embodiments of this utility model, the pressure relief hole and the buffer hole are staggered along the axial direction of the explosion-proof hole.
[0015] According to some embodiments of the present invention, at least two pressure relief holes are provided, and the at least two pressure relief holes are spaced apart along the circumferential direction of the peripheral wall plate.
[0016] According to some embodiments of the present invention, at least two buffer holes are provided, and the at least two buffer holes are spaced apart along the circumferential direction of the buffer plate.
[0017] According to some embodiments of this utility model, the minimum included angle between the line connecting the center of the pressure relief hole and the center of the explosion-proof hole and the line connecting the center of the buffer hole and the center of the explosion-proof hole is greater than or equal to 60°.
[0018] According to some embodiments of this utility model, the minimum diameter of the pressure relief hole is greater than the maximum diameter of the buffer hole.
[0019] According to some embodiments of the present invention, a buffer groove is provided on the side of the buffer plate away from the peripheral wall plate, and the buffer groove extends circumferentially along the buffer plate.
[0020] According to some embodiments of the present invention, in the axial direction of the pressure relief hole, from the buffer plate to the peripheral wall plate, the width of the pressure relief hole gradually increases.
[0021] According to some embodiments of this utility model, the peripheral wall plate, the puncturing element, and the sealing plate are an integral structure.
[0022] According to a second aspect embodiment of the present invention, a battery includes a cylindrical body, a first end cap, a second end cap, and a cell assembly. The first end cap is disposed at one end of the cylindrical body, and the second end cap is disposed at the other end of the cylindrical body. The cylindrical body, the first end cap, and the second end cap enclose a limiting space, and the cell assembly is housed within the limiting space. The first end cap is the battery cover plate described in the above embodiment.
[0023] The battery according to the second aspect embodiment of the present invention has at least the following beneficial effects:
[0024] By incorporating a buffer plate, when the pressure inside the battery becomes too high, the explosion-proof membrane bulges, causing it to be punctured by a puncture device. The fluid inside the battery then enters the first explosion-proof space through the explosion-proof hole. Subsequently, the fluid enters the second explosion-proof space through the buffer hole and is then discharged to the outside through the pressure relief hole. Because the pressure relief hole and the buffer hole are staggered along the circumference of the peripheral wall plate, the fluid flowing into the second explosion-proof space from the buffer hole needs to remain in the second explosion-proof space for a certain period of time. The air pressure in the second explosion-proof space gradually decreases before the fluid can be discharged to the outside through the pressure relief hole. This ensures the stability of the explosion-proof pressure of the battery cover, avoiding the risk of battery explosion and thus improving the safety of battery use.
[0025] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description
[0026] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:
[0027] Figure 1 This is a schematic diagram of the battery cover plate according to an embodiment of the present utility model. The explosion-proof film in the figure is in a non-bulging state.
[0028] Figure 2 This is a schematic diagram of the battery cover plate according to an embodiment of the present utility model, in which the explosion-proof film is in a bulging state;
[0029] Figure 3 This is a schematic diagram of a battery according to an embodiment of the present invention.
[0030] Figure label:
[0031] Explosion-proof cavity 10, first explosion-proof space 11, second explosion-proof space 12, bottom plate 100, explosion-proof hole 110, peripheral wall plate 200, pressure relief hole 210, sealing plate 300, buffer plate 400, buffer hole 410, buffer groove 420, explosion-proof membrane 500, puncture component 600, cylinder 700, battery cell assembly 800. Detailed Implementation
[0032] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.
[0033] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0034] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.
[0035] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.
[0036] In related technologies, for safety reasons, an explosion-proof valve is usually installed on the cylindrical battery cover, and the explosion-proof valve contains an explosion-proof disc. When the internal pressure reaches the opening pressure of the explosion-proof disc, the internal pressure is released from the explosion-proof valve, thereby preventing dangerous accidents such as explosions due to excessive internal pressure. However, the explosion-proof pressure of existing battery covers is unstable, which has a significant impact on battery safety.
[0037] Reference Figure 1 , Figure 2According to a first aspect of the present invention, a battery cover includes a base plate 100, a peripheral wall plate 200, a buffer plate 400, an explosion-proof membrane 500, and a puncture element 600. The base plate 100 is provided with an explosion-proof hole 110. The peripheral wall plate 200 is disposed on the base plate 100 and arranged around the outer periphery of the explosion-proof hole 110 along the axial direction of the explosion-proof hole 110. A sealing plate 300 is provided at one end of the peripheral wall plate 200 away from the base plate 100. The base plate 100, the peripheral wall plate 200, and the sealing plate 300 enclose an explosion-proof cavity 10. The peripheral wall plate 200 is provided with a pressure relief hole 210 communicating with the explosion-proof cavity 10. The buffer plate 400 is disposed inside the explosion-proof cavity 10 and arranged around the explosion-proof hole 110 along the axial direction of the explosion-proof hole 110. The outer periphery of the explosion-proof hole 110 is arranged to divide the explosion-proof cavity 10 into a first explosion-proof space 11 and a second explosion-proof space 12. The buffer plate 400 is provided with a buffer hole 410. The first explosion-proof space 11 is connected to the second explosion-proof space 12 through the buffer hole 410. Along the circumference of the peripheral wall plate 200, the pressure relief hole 210 is staggered from the buffer hole 410. The explosion-proof membrane 500 is provided on the bottom plate 100 and covers the explosion-proof hole 110. The puncture member 600 is provided on the side of the sealing plate 300 facing the explosion-proof membrane 500. The puncture member 600 is used to puncture the explosion-proof membrane 500 when it bulges. In this way, the explosion-proof pressure of the battery cover can be kept stable to avoid the risk of battery explosion and thus improve the safety of battery use.
[0038] Specifically, by setting a buffer plate 400, when the pressure inside the battery is too high, the explosion-proof membrane 500 bulges up, causing the explosion-proof membrane 500 to be punctured by the puncture device 600. The fluid inside the battery enters the first explosion-proof space 11 through the explosion-proof hole 110, and then enters the second explosion-proof space 12 through the buffer hole 410, and is discharged to the outside through the pressure relief hole 210. Since the pressure relief hole 210 and the buffer hole 410 are staggered along the circumference of the peripheral wall plate 200, the fluid flowing into the second explosion-proof space 12 from the buffer hole 410 needs to stay in the second explosion-proof space 12 for a certain period of time. The air pressure in the second explosion-proof space 12 gradually decreases, and the fluid can be discharged to the outside through the pressure relief hole 210. This ensures that the explosion-proof pressure of the battery cover is stable, thereby avoiding the risk of battery explosion and improving the safety of battery use.
[0039] In some embodiments of this utility model, the pressure relief hole 210 and the buffer hole 410 are staggered along the axial direction of the explosion-proof hole 110, which can increase the flow distance of the fluid in the second explosion-proof space 12, thereby reducing the air pressure in the second explosion-proof space 12 to a limited extent, ensuring the stability of the explosion-proof pressure of the battery cover and improving the safety of battery use.
[0040] Specifically, along the axial direction of the explosion-proof hole 110, the buffer hole 410 is located between the pressure relief hole 210 and the base plate 100. It can increase the flow distance of fluid in the second explosion-proof space 12, thereby reducing the air pressure in the second explosion-proof space 12 to a limited extent, ensuring the stability of the explosion-proof pressure of the battery cover and improving the safety of battery use.
[0041] It should be noted that, along the axial direction of the explosion-proof hole 110, the pressure relief hole 210 can also be located between the buffer hole 410 and the base plate 100, and there is no restriction here.
[0042] In some embodiments of this utility model, two pressure relief holes 210 are provided, and the two pressure relief holes 210 are arranged at intervals along the circumference of the peripheral wall plate 200, so that the fluid in the second explosion-proof space 12 can be discharged in time, so as to effectively reduce the gas pressure in the battery and ensure the explosion-proof pressure and temperature of the battery cover.
[0043] Specifically, the two pressure relief holes 210 are evenly spaced along the circumference of the peripheral wall plate 200, so that the fluid in the second explosion-proof space 12 can be discharged in time, thereby effectively reducing the gas pressure in the battery and ensuring the explosion-proof pressure and temperature of the battery cover.
[0044] It should be noted that the peripheral wall plate 200 is a ring structure, and the cross-section of the peripheral wall plate 200 can be circular or rectangular, without any restrictions.
[0045] It should be noted that the pressure relief hole 210 can also be configured with three or four, etc., without limitation.
[0046] In some embodiments of this utility model, two buffer holes 410 are provided, and the two buffer holes 410 are arranged at intervals along the circumference of the buffer plate 400, so that the fluid in the first explosion-proof space 11 can be discharged into the second explosion-proof space 12 in a timely manner.
[0047] Specifically, the buffer plate 400 has an annular structure, and two buffer holes 410 are evenly spaced along the circumference of the buffer plate 400, so that the fluid in the first explosion-proof space 11 can be discharged into the second explosion-proof space 12 in a timely manner.
[0048] It should be noted that the buffer plate 400 is a ring structure, and the cross-section of the buffer plate 400 can be a ring or a rectangle corresponding to the cross-section of the peripheral wall plate 200, without any restrictions.
[0049] It should be noted that the buffer hole 410 can also be configured with three or four, etc., without limitation.
[0050] In some embodiments of this utility model, the minimum included angle between the line connecting the center of the pressure relief hole 210 and the center of the explosion-proof hole 110 and the line connecting the center of the buffer hole 410 and the center of the explosion-proof hole 110 is greater than or equal to 60°, which can ensure the residence time of the fluid in the second explosion-proof space 12 so as to stabilize the explosion-proof pressure of the battery cover.
[0051] Specifically, if the minimum angle between the line connecting the center of the pressure relief hole 210 and the center of the explosion-proof hole 110 and the line connecting the center of the buffer hole 410 and the center of the explosion-proof hole 110 is less than 60°, the residence time of the fluid in the second explosion-proof space 12 is too short, and the explosion-proof pressure of the battery cover cannot be guaranteed to be stable.
[0052] In some embodiments of this utility model, the minimum diameter of the pressure relief hole 210 is greater than the maximum diameter of the buffer hole 410, which can reduce the pressure of the fluid discharged from the pressure relief hole 210 to ensure the stability of the explosion-proof pressure of the battery cover.
[0053] Specifically, the flow area of the pressure relief hole 210 is larger than that of the buffer hole 410. When the explosion-proof membrane 500 is punctured, the pressure of the fluid discharged from the pressure relief hole 210 can be reduced to ensure the stability of the explosion-proof pressure of the battery cover.
[0054] In some embodiments of this utility model, the width of the pressure relief hole 210 gradually increases in the axial direction from the buffer plate 400 to the peripheral wall plate 200, which can reduce the pressure of the fluid discharged from the pressure relief hole 210, so as to ensure the stability of the explosion-proof pressure of the battery cover.
[0055] Specifically, the flow area of the pressure relief hole 210 gradually increases, which can reduce the pressure of the fluid discharged from the pressure relief hole 210 to ensure the stability of the explosion-proof pressure of the battery cover.
[0056] In some embodiments of this utility model, a buffer groove 420 is provided on the side of the buffer plate 400 away from the peripheral wall plate 200. The buffer groove 420 extends circumferentially along the buffer plate 400, which can increase the flow resistance of the fluid in the buffer groove 420, thereby reducing the flow velocity of the fluid and effectively buffering the fluid.
[0057] Specifically, when the fluid enters the first explosion-proof space 11 through the explosion-proof hole 110, some of the fluid flows into the buffer tank 420, which can increase the flow resistance of the fluid in the buffer tank 420, thereby reducing the flow speed of the fluid and effectively buffering the fluid.
[0058] It should be noted that multiple buffer tanks 420 are configured, and the multiple buffer tanks 420 are arranged side by side at intervals along the axial direction of the explosion-proof hole 110, which can further reduce the flow velocity of the fluid, and no limitation is made here.
[0059] In some embodiments of this utility model, the peripheral wall plate 200, the puncture member 600 and the sealing plate 300 are integrated into one structure, which can reduce the number of molds, thereby reducing the production and manufacturing cost of the molds and thus reducing the production and manufacturing cost of the battery cover.
[0060] Specifically, the peripheral wall panel 200, the puncture part 600 and the sealing plate 300 can be integrally formed by die casting, which can reduce the number of molds, thereby reducing the production and manufacturing cost of the molds and thus reducing the production and manufacturing cost of the battery cover.
[0061] As another implementation, the peripheral wall plate 200 and the sealing plate 300 can be connected by welding, and the puncturing part 600 and the sealing plate 300 can also be connected by welding. The welding methods include, but are not limited to, resistance welding, laser welding or ultrasonic welding, which will not be described in detail here.
[0062] Reference Figure 3 According to a second aspect embodiment of the present invention, the battery includes a cylindrical body 700, a first end cap, a second end cap, and a cell assembly 800. The first end cap is disposed at one end of the cylindrical body 700, and the second end cap is disposed at the other end of the cylindrical body 700. The cylindrical body 700, the first end cap, and the second end cap enclose a limiting space, and the cell assembly 800 is housed within the limiting space. The first end cap is the battery cover plate of the first aspect embodiment of the present invention.
[0063] Specifically, by setting a buffer plate 400, when the pressure inside the battery is too high, the explosion-proof membrane 500 bulges up, causing the explosion-proof membrane 500 to be punctured by the puncture device 600. The fluid inside the battery enters the first explosion-proof space 11 through the explosion-proof hole 110, and then enters the second explosion-proof space 12 through the buffer hole 410, and is discharged to the outside through the pressure relief hole 210. Since the pressure relief hole 210 and the buffer hole 410 are staggered along the circumference of the peripheral wall plate 200, the fluid flowing into the second explosion-proof space 12 from the buffer hole 410 needs to stay in the second explosion-proof space 12 for a certain period of time. The air pressure in the second explosion-proof space 12 gradually decreases, and the fluid can be discharged to the outside through the pressure relief hole 210. This ensures that the explosion-proof pressure of the battery cover is stable, thereby avoiding the risk of battery explosion and improving the safety of battery use.
[0064] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0065] The present invention has been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the invention.
Claims
1. A battery cover, characterized in that, include: The base plate (100) is provided with an explosion-proof hole (110); A peripheral wall plate (200) is disposed on the base plate (100) along the axial direction of the explosion-proof hole (110). The peripheral wall plate (200) is arranged around the outer periphery of the explosion-proof hole (110). A sealing plate (300) is provided at one end of the peripheral wall plate (200) away from the base plate (100). The base plate (100), the peripheral wall plate (200) and the sealing plate (300) enclose to form an explosion-proof cavity (10). The peripheral wall plate (200) is provided with a pressure relief hole (210) communicating with the explosion-proof cavity (10). A buffer plate (400) is disposed inside the explosion-proof cavity (10). Along the axial direction of the explosion-proof hole (110), the buffer plate (400) is arranged around the outer periphery of the explosion-proof hole (110) to divide the explosion-proof cavity (10) into a first explosion-proof space (11) and a second explosion-proof space (12). The buffer plate (400) is provided with a buffer hole (410). The first explosion-proof space (11) is connected to the second explosion-proof space (12) through the buffer hole (410). Along the circumference of the peripheral wall plate (200), the pressure relief hole (210) is staggered from the buffer hole (410). An explosion-proof membrane (500) is disposed on the base plate (100) and covers the explosion-proof hole (110); A puncture element (600) is provided on the side of the sealing plate (300) facing the explosion-proof membrane (500), and the puncture element (600) is used to puncture the explosion-proof membrane (500) when the explosion-proof membrane (500) bulges.
2. The battery cover according to claim 1, characterized in that, Along the axial direction of the explosion-proof hole (110), the pressure relief hole (210) is offset from the buffer hole (410).
3. The battery cover according to claim 1, characterized in that, At least two pressure relief holes (210) are provided, and the at least two pressure relief holes (210) are spaced apart circumferentially along the peripheral wall plate (200).
4. The battery cover according to claim 1, characterized in that, At least two buffer holes (410) are provided, and the at least two buffer holes (410) are spaced apart circumferentially along the buffer plate (400).
5. The battery cover according to claim 1, characterized in that, The minimum included angle between the line connecting the center of the pressure relief hole (210) and the center of the explosion-proof hole (110) and the line connecting the center of the buffer hole (410) and the center of the explosion-proof hole (110) is greater than or equal to 60°.
6. The battery cover according to claim 1, characterized in that, The minimum diameter of the pressure relief hole (210) is greater than the maximum diameter of the buffer hole (410).
7. The battery cover according to claim 1, characterized in that, The buffer plate (400) has a buffer groove (420) on the side away from the peripheral wall plate (200), and the buffer groove (420) extends circumferentially along the buffer plate (400).
8. The battery cover according to claim 1, characterized in that, In the axial direction of the pressure relief hole (210), from the buffer plate (400) to the peripheral wall plate (200), the width of the pressure relief hole (210) gradually increases.
9. The battery cover according to claim 1, characterized in that, The peripheral wall panel (200), the puncture component (600), and the sealing plate (300) are an integral structure.
10. A battery, characterized in that, The device includes a cylindrical body (700), a first end cap, a second end cap, and a battery cell assembly (800). The first end cap is disposed at one end of the cylindrical body (700), and the second end cap is disposed at the other end of the cylindrical body (700). The cylindrical body (700), the first end cap, and the second end cap enclose a limiting space, and the battery cell assembly (800) is housed within the limiting space. The first end cap is a battery cover plate as described in any one of claims 1 to 9.