Cover assembly, battery, and electronic device

Abstract

To provide a cover assembly, a battery, and an electronic device in which a heat-resistant sheet is not easily dropped and at the same time, the safety of the battery is ensured.SOLUTION: A cover assembly includes a cover body, a boss, and a heat-resistant sheet 13. A pressure relief hole 111 is provided on the cover body. The boss is disposed on the upper surface of the cover body and surrounds the outer periphery of the pressure relief hole. The boss surrounds a first region 121 that communicates with the pressure relief hole, and together with the pressure relief hole forms a storage space. The heat-resistant sheet is disposed within the storage space and at least partially covers the pressure relief hole.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present invention relates to the technical field of batteries, and more particularly to a cover assembly, a battery, and an electronic device. [Background technology]

[0002] In recent years, the rapid progress of new energy vehicles has greatly promoted the sustainable development of society and the harmonious coexistence of people and the environment. Among the various conceptual new energy vehicles, electric vehicles are already technically feasible for mass production and, with government support, are gaining increasing attention and popularity. As a solution to energy and environmental issues, a key technology in electric vehicles is a rechargeable battery assembly that replaces the gasoline-fueled engine as the power source.

[0003] During use, multiple batteries are connected in series or parallel to form a battery pack. Each battery's cover assembly has a pressure relief hole with a boss attached around the hole. If a battery experiences thermal runaway, it releases high-temperature gas and materials, which are then sent back to the pressure relief hole of the adjacent battery. To prevent this, a heat-resistant sheet is currently placed over the pressure relief hole of the battery's cover assembly and connected to the top of the boss. However, the top of the boss has a small surface area, resulting in a small contact area between the heat-resistant sheet and the boss, resulting in an unstable connection. If there is high-pressure airflow passing through the side, the heat-resistant sheet is likely to fall off, affecting the safety performance of the battery. Summary of the Invention [Problem to be solved by the invention]

[0004] An object of the present invention is to provide a cover assembly, a battery, and an electronic device that make it difficult for a heat-resistant sheet to fall off and at the same time ensure the safety of the battery. [Means for solving the problem]

[0005] To solve the above technical problems, an embodiment of the present invention provides a cover assembly including a cover body, a boss, and a heat-resistant sheet. A pressure relief hole is provided in the cover body. A boss is disposed on the upper surface of the cover body to surround the outer periphery of the pressure relief hole. The boss surrounds a first region, which communicates with the pressure relief hole and defines a storage space together with the pressure relief hole. A heat-resistant sheet is disposed in the storage space to at least partially cover the pressure relief hole.

[0006] Compared with prior art documents, the present invention provides a heat-resistant sheet within the storage space to cover the pressure relief hole. The heat-resistant sheet covers an appropriate area and does not connect to the cover body too much, allowing the battery to smoothly release pressure. This meets the requirement for smoothly opening the valve of a battery experiencing thermal runaway, while at the same time preventing high-temperature gases and materials from falling from other batteries. Furthermore, by placing the heat-resistant sheet within the storage space, it will not fall due to lateral airflow. In this way, the heat-resistant sheet always covers the pressure relief hole, ensuring the safety performance of the battery.

[0007] In one embodiment, the heat-resistant sheet is disposed within the first region.

[0008] In one embodiment, the bottom edge of the inner wall of the boss is flush with the top edge of the inner wall of the pressure relief hole.

[0009] In one embodiment, the boss is spaced apart from the edge of the pressure release hole, and the heat-resistant sheet is fixed to a portion of the cover body surrounded by the boss.

[0010] In one embodiment, the distance between the edge of the pressure release hole and the boss is 1 mm to 5 mm.

[0011] In one embodiment, the boss has an inner wall that surrounds the outer periphery of the pressure relief hole, and the heat resistant sheet is spaced apart from the inner wall of the boss.

[0012] In one embodiment, the heat-resistant sheet is fixed to the inner wall of the boss.

[0013] In one embodiment, the inner wall of the boss further has a position limiting portion extending toward the first region, the area of ​​the orthogonal projection of the position limiting portion along the thickness direction of the cover body is smaller than the area of ​​the pressure release hole, and the heat-resistant sheet is located below the position limiting portion.

[0014] In one embodiment, at least a portion of the heat resistant sheet is located within the pressure relief hole.

[0015] In one embodiment, the cover assembly further includes an explosion-proof sheet disposed on the cover body, the explosion-proof sheet covering the pressure release hole, and the heat-resistant sheet connecting to an upper surface of the explosion-proof sheet.

[0016] In one embodiment, the explosion-proof sheet is disposed on the bottom surface of the cover body, and the heat-resistant sheet is disposed within the pressure release hole.

[0017] In one embodiment, the inner wall of the boss further has a position limiting portion extending toward the first region, the area of ​​the orthogonal projection of the position limiting portion along the thickness direction of the cover body is smaller than the area of ​​the pressure release hole, and the heat-resistant sheet is sandwiched between the position limiting portion and the explosion-proof sheet.

[0018] In one embodiment, the cover assembly further includes a protective film, which is disposed above the heat-resistant sheet and covers the area surrounded by the boss.

[0019] In one embodiment, the protective film is secured to the top surface of the boss.

[0020] In one embodiment, a vent is further provided in the area where the heat-resistant sheet covers the pressure release hole.

[0021] In one embodiment, the heat resistant sheet is one of fiberglass, mica, ceramic, and ceramic rubber.

[0022] One embodiment of the present invention further provides a battery including the cover assembly of any one of the above-described embodiments, a housing having an opening closed by the cover assembly, and a battery cell disposed within the housing.

[0023] One embodiment of the present invention also provides an electronic device including the battery described above. [Brief explanation of the drawings]

[0024] [Figure 1] 1 is a schematic structural diagram of a battery in one embodiment of the present invention; [Figure 2] FIG. 2 is a schematic structural diagram of a housing according to one embodiment of the present invention. [Figure 3] FIG. 2 is an enlarged view of a cover assembly in one embodiment of the present invention. [Figure 4] 1 is a schematic structural diagram of a cover body according to one embodiment of the present invention. [Figure 5] 1 is a schematic structural diagram of a battery in one embodiment of the present invention; [Figure 6] FIG. 6 is a cross-sectional view taken along the section line "AA" in FIG. 5. [Figure 7] FIG. 7 is an enlarged view of a portion A in FIG. [Figure 8] FIG. 2 is a cross-sectional view of a battery according to another embodiment of the present invention. [Figure 9] FIG. 9 is an enlarged view of a portion B in FIG. 8. [Figure 10] FIG. 10 is an enlarged view of a cover assembly in another embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0025] In order to clarify the objectives, technical solutions, and advantages of the present invention, various embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details are proposed in various embodiments of the present invention to help readers better understand the present invention. However, even without these technical details and various changes and modifications based on the following embodiments, the technical solutions claimed by each claim of the present invention can be realized.

[0026] Unless the context otherwise requires, throughout the specification and claims, the term "comprises" and variations thereof, such as "including" and "having," are to be construed in their open and inclusive sense, i.e., "including but not limited to."

[0027] In order to better understand the objectives, features and advantages of the present invention, various embodiments of the present invention will be described in detail below with reference to the drawings. It should be understood that the embodiments shown in the drawings are not intended to limit the protection scope of the present invention, but merely to describe the essential spirit of the technical solution of the present invention.

[0028] References throughout this specification to "one embodiment" or "an embodiment" mean that a particular feature, structure, or characteristic described in connection with an embodiment is included in at least one embodiment. Thus, the appearances of the phrase "in one embodiment" or "an embodiment" in various places throughout this specification do not necessarily all refer to the same embodiment. Also, particular features, structures, or characteristics may be combined in any manner in one or more embodiments.

[0029] As used in this specification and the appended claims, the singular forms "a" and "the" are used interchangeably. " also includes plural referents unless the context clearly dictates otherwise. It should be noted that the term "or" is commonly used to mean "and / or" unless the context clearly dictates otherwise.

[0030] In the following description, a number of directional terms are used in the description to clearly illustrate the structure and operation of the present invention, however, terms such as "front", "back", "left", "right", "outside", "inside", "outside", "inside", "up", "down" and the like should be understood as terms of explanation rather than limitations.

[0031] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

[0032] One embodiment of the present invention provides an electronic device including a battery 1 shown in FIG. 1. The battery 1 includes a cover assembly 10, a housing 20, and battery cells. As shown in FIG. 2, the housing 20 has an opening 21, which is closed by the cover assembly 10. The battery cells are disposed within the housing 20. In this embodiment, the housing 20 is shaped like a rectangular box, and the cover assembly 10 is shown as being adaptively installed in a strip shape. As will be understood by those skilled in the art, if the housing 20 has another shape, the cover assembly 10 can also have another shape as long as it can seal the opening 21 of the housing 20. It should be noted that if the housing 20 has a rectangular box shape, the openings 21 may be installed at both ends of its length, and the cover assembly 10 may cover the openings 21 at both ends. The electronic device may be an electric car, an electric motorcycle, or the like.

[0033] Specifically, as shown in FIG. 3 , the cover assembly 10 includes a cover body 11, a boss 12, and a heat-resistant sheet 13. As shown in FIG. 4 , a pressure relief hole 111 is provided on the cover body 11, and the battery further includes an explosion-proof sheet 14 disposed in the pressure relief hole 111. FIG. 6 is a cross-sectional view of the battery 1 shown in FIG. 5 taken along the cross-sectional line "AA," and FIG. 7 is a partially enlarged view of the pressure relief hole 111 in FIG. 6 . As shown in FIG. 7 , the boss 12 is disposed on the upper surface of the cover body 11 and surrounds the outer periphery of the pressure relief hole 111. The boss 12 surrounds a first region 121. That is, the first region 121 is a space surrounded by the boss 12 between the upper surface of the cover body 11 and the upper surface of the boss 12. The first region 121 communicates with the pressure relief hole 111 and, together with the pressure relief hole 111, forms a storage space. The heat-resistant sheet 13 is disposed in the storage space and partially covers the pressure relief hole 111.

[0034] As can be seen from the above, a heat-resistant sheet is placed within the storage space to cover the pressure release hole. The heat-resistant sheet covers an appropriate area and does not have an excessively large connection area with the cover body, allowing the battery to release pressure smoothly when releasing pressure. This meets the requirement for smoothly opening the valve of a battery experiencing thermal runaway, while at the same time preventing high-temperature gases and materials from falling from other batteries. Furthermore, by placing the heat-resistant sheet within the storage space, it will not fall due to airflow from the side. In this way, the heat-resistant sheet always covers the pressure release hole, ensuring the safety performance of the battery.

[0035] In one embodiment of the present invention, a battery 1 includes a cover assembly 10, a housing 20, and a battery cell. As shown in FIG. 2 , the housing 20 has an opening 21, which is closed by the cover assembly 10. The battery cell is disposed within the housing 20. In this embodiment, the housing 20 has a rectangular box shape, and the cover assembly 10 is shown as being adaptively installed in a strip shape. As will be understood by those skilled in the art, when the housing 20 has another shape, the cover assembly 10 can also have another shape as long as it can seal the opening 21 of the housing 20. It should be noted that when the housing 20 has a rectangular box shape, the openings 21 may be installed at both ends in the length direction, and the cover assembly 10 may cover the openings 21 at both ends.

[0036] Specifically, as shown in FIG. 3 , the cover assembly 10 includes a cover body 11, a boss 12, and a heat-resistant sheet 13. As shown in FIG. 4 , a pressure relief hole 111 is provided on the cover body 11. FIG. 6 is a cross-sectional view of the battery 1 shown in FIG. 5 taken along the cross-sectional line "AA," and FIG. 7 is a partially enlarged view of the pressure relief hole 111 in FIG. 6 . As shown in FIG. 7 , the boss 12 is disposed on the upper surface of the cover body 11 and surrounds the outer periphery of the pressure relief hole 111. The boss 12 surrounds a first region 121. That is, the first region 121 is a space surrounded by the boss 12 between the upper surface of the cover body 11 and the upper surface of the boss 12. In this embodiment, the height of the boss 12 is equal to the height of the first region 121. The first region 121 communicates with the pressure relief hole 111 and, together with the pressure relief hole 111, forms a storage space. The heat-resistant sheet 13 is disposed within the storage space and partially covers the pressure relief hole 111.

[0037] Preferably, as shown in FIG. 7 , the heat-resistant sheet 13 is disposed within the first region 121. Furthermore, the boss 12 is disposed at a distance from the edge of the pressure release hole 111, and the heat-resistant sheet 13 is fixed to a portion of the cover body 11 surrounded by the boss 12. That is, the inner diameter of the pressure release hole 111 is smaller than the inner diameter of the boss 12, and the cover body 11 protrudes toward the inner wall 122, and the portion beyond the inner wall 122 forms the inner edge 112, on which the heat-resistant sheet 13 is disposed. That is, the heat-resistant sheet 13 is disposed above the cover body 11 and inside the boss 12. Those skilled in the art can configure the heat-resistant sheet 13 according to actual needs. The heat-resistant sheet 13 is attached and fixed to the cover body 11.

[0038] Furthermore, in FIG. 7 , the distance a between the edge of the pressure release hole 111 and the boss 12 is within a range of 1 mm to 5 mm. For example, the distance a between the edge of the pressure release hole 111 and the boss 12 can be set to 1 mm, 2 mm, 2.5 mm, 3 mm, 4 mm, or 5 mm. By ensuring that the distance a between the edge of the pressure release hole 111 and the boss 12 is not too large, it is possible to prevent the opening of the pressure release hole 111 from being too small and hindering the release of high-temperature gas. Furthermore, the distance a is not too small so that it is not inconvenient to place the heat-resistant sheet 13 in the first region 121. The heat-resistant sheet 13 is placed so that a sufficient contact area with the cover body 11 is obtained, and the heat-resistant sheet 13 is positioned in a more appropriate position.

[0039] 7, the boss 12 has an inner wall 122 surrounding the outer periphery of the pressure release hole 111, and the heat-resistant sheet 13 is spaced apart from the inner wall 122 of the boss 12. Those skilled in the art can configure it according to actual needs. The heat-resistant sheet 13 may be fixed to the inner wall 122 of the boss 12 without departing from the scope of the present invention.

[0040] Furthermore, as shown in FIG. 7 , the inner wall 122 of the boss 12 further includes a position limiting portion 123 extending toward the first region 121. The area of ​​the orthogonal projection of the position limiting portion 123 along the thickness direction of the cover body 11 is smaller than the area of ​​the pressure release hole 111, and the heat-resistant sheet 13 is positioned below the position limiting portion 123. The heat-resistant sheet 13 thus positioned is stably fixed within the storage space and less likely to fall, preventing the heat-resistant sheet 13 from protruding from the boss 12. The position limiting portion 123 may continuously press the heat-resistant sheet 13, and those skilled in the art can install it according to actual needs. It should be understood that there may be a gap between the position limiting portion 123 and the heat-resistant sheet 13, or multiple position limiting portions 123 may be provided at intervals to continuously press the heat-resistant sheet 13 without departing from the scope of the present invention. During the construction process, the heat-resistant sheet 13 is first placed within the first region 121. After the heat-resistant sheet 13 is attached, the upper part of the boss 12 can be punched out to form the position limiting portion 123. Naturally, the position limiting portion does not have to be provided.

[0041] 3 and 7, the cover assembly 10 further includes a protective film 15 disposed above the heat-resistant sheet 13, and the protective film 15 covers the area surrounded by the boss 12. The protective film 15 may be attached to the top of the boss 12, or the protective film 15 may be disposed within the first area surrounded by the boss 12, and those skilled in the art can arrange the protective film 15 according to actual needs.

[0042] Preferably, the protective film 15 is fixed to the upper surface of the boss 12 as shown in FIG.

[0043] 3, the cover assembly 10 may further include an explosion-proof sheet 14 disposed on the cover body 11, the explosion-proof sheet 14 covering the pressure release hole 111. The explosion-proof sheet 14 can ensure the electrical safety of the battery 1, and can be installed by those skilled in the art according to actual needs. It should be understood that the explosion-proof sheet 14 does not necessarily have to be installed.

[0044] 3, the heat-resistant sheet 13 provides a vent 131 in the area covering the pressure release hole 111. The vent 131 may be provided as a hole or a slit, and may be in the shape of a cross, a circle, or a square as shown in the figure, and the vent 131 only needs to achieve ventilation without departing from the scope of the present invention.

[0045] Furthermore, the heat-resistant sheet 13 can be made of one of glass fiber, mica, ceramic, and ceramic rubber. Those skilled in the art can configure it according to actual needs. The heat-resistant sheet 13 can be 0.2 mm to 1 mm thick and can withstand temperatures up to 1000°C.

[0046] FIG. 8 shows a schematic structural diagram of a cover assembly 10 according to another embodiment of the present invention, FIG. 9 shows a partial enlarged view of the pressure relief hole 111 in FIG. 8, and FIG. 10 is an enlarged view of the cover assembly 10 according to another embodiment of the present invention. As shown in FIGS. 9 and 10, the bottom edge of the inner wall 122 of the boss 12 is flush with the upper edge of the inner wall 122 of the pressure relief hole 111. That is, the cover body 11 is perforated from top to bottom, and the first region surrounded by the boss 12 and the pressure relief hole 111 penetrates each other. The first region and the pressure relief hole 111 are connected as a whole, and the openings of the first region and the pressure relief hole 111 are the same. As shown in the figures, a heat-resistant sheet 13 is disposed within the pressure relief hole 111 of the storage space to cover the pressure relief hole 111.

[0047] As shown in FIGS. 9 and 10 , the cover assembly 10 can further include an explosion-proof sheet 14 disposed on the cover body 11, the explosion-proof sheet 14 covering the pressure release hole 111, and the heat-resistant sheet 13 connected to the upper surface of the explosion-proof sheet 14. That is, the heat-resistant sheet 13 is fixed to the explosion-proof sheet 14 and attached to the explosion-proof sheet 14, and the explosion-proof sheet 14 is fixed to the cover body 11, so that the heat-resistant sheet 13 is disposed within the accommodation space. In this arrangement, the heat-resistant sheet 13 only needs to cover the area where the explosion-proof sheet 14 is located, thereby reducing the area used for the heat-resistant sheet and saving costs. In this embodiment, the heat-resistant sheet 13 is disposed only within the pressure release hole 111. It should be understood that the heat-resistant sheet 13 may be configured to be relatively thick. In this case, the heat-resistant sheet 13 is disposed within the pressure release hole 111 and the first region 121 disposed within the accommodation space. The heat resistant sheet 13 may be spaced apart from the inner wall 122 of the pressure relief hole 111 or may be connected to the inner wall 122 of the pressure relief hole 111 without departing from the scope of the present invention.

[0048] In another embodiment, the cover assembly 10 may not include the explosion-proof sheet 14. In that case, the heat-resistant sheet 13 is disposed within the pressure relief hole 111, and the heat-resistant sheet 13 may be connected to the hole wall of the pressure relief hole 111, or may be connected to the inner wall of the boss 12 partially within the first region 121.

[0049] 9, the explosion-proof sheet 14 is preferably placed on the bottom surface of the cover body 11, and the heat-resistant sheet 13 is placed in the pressure release hole 111. The explosion-proof sheet 14 may also be placed in the pressure release hole 111 without departing from the scope of the present invention.

[0050] Furthermore, as shown in FIG. 9 , the inner wall 122 of the boss 12 further includes a position limiting portion 123 extending toward the first region 121. The area of ​​the orthogonal projection of the position limiting portion 123 along the thickness direction of the cover body 11 is smaller than the area of ​​the pressure release hole 111, and the heat-resistant sheet 13 is sandwiched between the position limiting portion 123 and the explosion-proof sheet 14. The heat-resistant sheet 13 thus installed is stably fixed within the housing space and less likely to fall off. This arrangement can be easily configured by those skilled in the art according to actual needs. During the construction process, the heat-resistant sheet 13 may be first placed within the pressure release hole 111. After the heat-resistant sheet 13 is attached, the upper portion of the boss 12 can be punched out to form the position limiting portion 123. Of course, the position limiting portion 123 is not required.

[0051] 9 and 10, the cover assembly 10 further includes a protective film 15 disposed above the heat-resistant sheet 13, and the protective film 15 covers the area surrounded by the boss 12. The protective film 15 may be attached to the top of the boss 12, or the protective film 15 may be disposed in the inner hole of the boss 12, and those skilled in the art can arrange the protective film 15 according to actual needs.

[0052] 10, the heat-resistant sheet 13 provides a vent 131 in the area covering the pressure release hole 111. The vent 131 may be provided as a hole or a slit, and may be in the shape of a cross, a circle, or a square as shown in the figure, and the vent 131 only needs to achieve ventilation without departing from the scope of the present invention.

[0053] While preferred embodiments of the present invention have been described in detail above, it should be understood that aspects of the embodiments can be modified, if necessary, to provide additional embodiments using aspects, features, and concepts from various patents, applications, and publications.

[0054] These and other changes can be made to the embodiments in light of the above detailed description. In general, the terms used in the claims should not be construed as being limited to the specific embodiments disclosed in the description and claims, but should be understood to include all possible embodiments along with all equivalents to which these claims are entitled.

[0055] As will be understood by those skilled in the art, these embodiments are specific examples for realizing the present invention, and in actual applications, various changes can be made to the form and details thereof without departing from the spirit and scope of the present invention. [Industrial Applicability]

[0056] The cover assembly, battery, and electronic device of the present invention can be applied to the battery technical field. [Explanation of symbols]

[0057] 1 battery 10 Cover Assembly 11 Cover body 12 Boss 13 Heat-resistant sheet 14 Explosion-proof sheet 15 Protective film 20 Case 21 Opening 111 Pressure relief hole 112 Common-law marriage 121 1st area 122 Inner wall 123 Position restriction section 131 Ventilation section

Claims

1. a cover body having a pressure release hole disposed therein; a boss disposed on the upper surface of the cover body, surrounding an outer periphery of the pressure release hole, and surrounding a first region that communicates with the pressure release hole and forms an accommodation space together with the pressure release hole; a heat-resistant sheet disposed in the accommodation space and at least partially covering the pressure release hole; Including, A cover assembly in which the inner wall of the boss further has a position limiting portion extending toward the first region, the area of ​​the orthogonal projection of the position limiting portion along the thickness direction of the cover body is smaller than the area of ​​the pressure release hole, and the heat-resistant sheet is located below the position limiting portion.

2. The cover assembly according to claim 1 , wherein the heat-resistant sheet is disposed within the first region.

3. 3. The cover assembly of claim 2, wherein a bottom edge of the inner wall of the boss is flush with a top edge of the inner wall of the pressure relief hole.

4. 3. The cover assembly according to claim 2, wherein the boss is spaced apart from the edge of the pressure relief hole, and the heat-resistant sheet is fixed to a portion of the cover body surrounded by the boss.

5. 5. The cover assembly of claim 4, wherein the distance between the edge of the pressure relief hole and the boss is between 1 mm and 5 mm.

6. 5. The cover assembly of claim 4, wherein the boss has an inner wall surrounding the outer periphery of the pressure relief hole, and the heat resistant sheet is spaced apart from the inner wall of the boss.

7. The cover assembly according to claim 2 , wherein the heat-resistant sheet is fixed to an inner wall of the boss.

8. The cover assembly of claim 1 , wherein at least a portion of the heat-resistant sheet is located within the pressure relief hole.

9. 9. The cover assembly according to claim 8, further comprising an explosion-proof sheet disposed on the cover body, the explosion-proof sheet covering the pressure release hole, and the heat-resistant sheet connected to an upper surface of the explosion-proof sheet.

10. The cover assembly according to claim 9 , wherein the explosion-proof sheet is disposed on the bottom surface of the cover body, and the heat-resistant sheet is disposed within the pressure release hole.

11. A cover assembly as described in Claim 9, wherein the heat-resistant sheet is sandwiched between the position limiting portion and the explosion-proof sheet.

12. The cover assembly according to claim 1 , further comprising a protective film disposed above the heat-resistant sheet, the protective film covering an area surrounded by the boss.

13. The cover assembly of claim 12 , wherein the protective film is secured to an upper surface of the boss.

14. The cover assembly according to claim 1 , further comprising a vent provided in an area where the heat-resistant sheet covers the pressure release hole.

15. The cover assembly of claim 1 , wherein the heat resistant sheet is one of fiberglass, mica, ceramic, and ceramic rubber.

16. A cover assembly according to any one of claims 1 to 15; a housing having an opening closed by the cover assembly; a battery cell disposed within the housing; Including battery.

17. 17. An electronic device comprising the battery of claim 16.

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