Vapor chamber, battery and battery module

Abstract

The utility model provides a vapor chamber, a battery and a battery module, the vapor chamber is applied to the battery, and the vapor chamber comprises: a first plate body having a first end; the second plate body is connected with the first end, an included angle is formed between the second plate body and the first plate body, the second plate body is provided with a first surface deviating from the first plate body in the extending direction of the first plate body, and a through groove is formed in the first surface. The included angle is formed between the first plate body and the second plate body, so that the vapor chamber can be in full contact with a battery cell, the heat of a core package is balanced, and the risk of thermal runaway caused by heat accumulation of the core package is reduced; the through groove is formed in the first surface, deviating from the first plate body, of the second plate body, so that when the battery is in thermal runaway, the problem that high-heat gas cannot be exhausted in time due to the fact that an exhaust channel is narrowed (even an anti-explosion valve is blocked) caused by the gravity influence on a core package, and then the safety risk is increased can be solved.

Description

Technical Field

[0001] The present application relates to the field of battery heat dissipation technology, and in particular to a heat spreader, a battery, and a battery module. Background Art

[0002] In related technologies, when a battery is working, a large amount of heat is generated inside the battery, and heat accumulation is prone to occur. If a large amount of heat accumulates inside the battery, it may cause thermal runaway of the battery, eventually leading to fire or even explosion, triggering a chain reaction in the battery module, causing adjacent batteries to trigger thermal runaway, resulting in serious safety problems, causing personal danger and property loss. Utility Model Content

[0003] The embodiments of the present application provide a vapor chamber, a battery, and a battery module, which can improve the technical problem of battery thermal runaway caused by heat accumulation inside the battery.

[0004] In a first aspect, an embodiment of the present application provides a vapor chamber for use in a battery, comprising:

[0005] A first plate having a first end;

[0006] The second plate is connected to the first end and is arranged at an angle to the first plate. Along the extension direction of the first plate, the second plate has a first surface facing away from the first plate, and the first surface is provided with a through groove.

[0007] In one embodiment, the first plate and the second plate are connected in an L-shape.

[0008] In one embodiment, the through slot includes a first groove. In the first direction, the first groove passes through two opposite sides of the second plate body. The first groove also passes through a side surface of a side where the second plate body is connected to the first plate body.

[0009] In one embodiment, the through groove further includes a second groove, which is arranged at an angle to the first groove and is connected to each other; and / or, in the second direction, the second groove passes through opposite sides of the second plate body.

[0010] In one embodiment, at least one reinforcing rib is provided in the second groove, and an extending direction of the at least one reinforcing rib is parallel to an axial direction of the second groove.

[0011] In one embodiment, an end of the at least one reinforcing rib away from the first groove is aligned with a side surface of the second plate away from the first groove; and / or a length of the at least one reinforcing rib is smaller than a length of the second groove.

[0012] In a second aspect, an embodiment of the present application provides a battery, comprising the aforementioned vapor chamber, and further comprising:

[0013] case;

[0014] The core package is arranged in the shell and has a first heat dissipation surface and a second heat dissipation surface connected to each other;

[0015] The heat spreader is arranged in the shell, and the first plate body contacts the first heat dissipation surface, and the second plate body contacts the second heat dissipation surface.

[0016] In one embodiment, the shell has a second surface, the second surface is close to the through groove, and the battery further includes an explosion-proof valve, which is disposed on the second surface.

[0017] In one embodiment, the battery includes two vapor chambers, the first plates of the two vapor chambers are in contact with each other, the second plates of the two vapor chambers are in contact with each other, and the through grooves of the two vapor chambers are interconnected.

[0018] In one embodiment, the two through grooves constitute an exhaust area, and in the third direction, the projection of the explosion-proof valve is located in the exhaust area.

[0019] In one embodiment, the core package has a third surface, a fourth surface and a fifth surface, the first heat dissipation surface, the third surface, the fourth surface and the fifth surface are connected end to end in sequence and are all connected to the second heat dissipation surface, and the battery also includes an insulating film, which is coated on the third surface, the fourth surface and the fifth surface.

[0020] In one embodiment, the second heat dissipation surface includes a first area and a second area surrounding the first area, the first area is in contact with the second plate, and the second area is covered with an insulating film.

[0021] In one embodiment, the housing has an opening, and the battery further includes a top cover assembly, which closes the opening.

[0022] In a third aspect, an embodiment of the present application provides a battery module comprising the above-mentioned battery.

[0023] Beneficial effects of the embodiments of the present application:

[0024] In an embodiment of the present application, the first plate and the second plate are arranged at an angle, so that the heat spreader can fully contact the core package, balance the heat of the core package, and reduce the risk of thermal runaway caused by heat accumulation in the core package; by providing a through groove on the first surface of the second plate away from the first plate, it can be achieved that when the battery thermal runaway occurs, the exhaust channel becomes narrower (or even the explosion-proof valve is blocked) due to the influence of gravity on the core package, and the high-temperature gas cannot be discharged in time, thereby increasing the safety risk. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 is a three-dimensional schematic diagram of a vapor chamber provided in some embodiments of the present application;

[0027] Figure 2 is a three-dimensional schematic diagram of a vapor chamber provided in some other embodiments of the present application;

[0028] Figure 3 yes Figure 2 A side view of the vapor chamber shown;

[0029] Figure 4 yes Figure 2 A bottom view of the vapor chamber shown;

[0030] Figure 5 is a schematic structural diagram of a battery provided in some embodiments of the present application;

[0031] Figure 6 is a schematic structural diagram of a battery housing provided in some embodiments of the present application;

[0032] Figure 7 is a schematic diagram of an exhaust area provided in some embodiments of the present application;

[0033] Figure 8 is a bottom view of a core package provided in some embodiments of the present application;

[0034] Figure 9 Schematic diagram of the structure of batteries provided in other embodiments of the present application.

[0035] Reference numerals:

[0036] 1. First plate; 2. Second plate; 3. Through groove; 4. Core package; 5. Shell; 6. Explosion-proof valve; 7. Insulation membrane; 8. Top cover assembly; 11. First end; 21. First surface; 22. First groove; 23. Second groove; 24. Reinforcing rib; 41. First heat dissipation surface; 42. Second heat dissipation surface; 51. Second surface; 200. Exhaust area; X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present application. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, unless otherwise specified, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; and "inside" and "outside" refer to the outline of the device.

[0038] In this application, the word "exemplary" is used to mean "serving as an example, illustration, or illustration." Any embodiment described in this application as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. The following description is given to enable any person skilled in the art to implement and use the present application. In the following description, details are listed for the purpose of explanation. It should be understood that one of ordinary skill in the art can recognize that the present application can be implemented without using these specific details. In other instances, well-known structures and processes are not elaborated in detail to avoid obscuring the description of the present application with unnecessary details. Therefore, the present application is not intended to be limited to the embodiments shown, but is consistent with the widest scope consistent with the principles and features disclosed in this application.

[0039] Please refer to Figure 1 , Figure 1 The figure is a perspective schematic diagram of a vapor chamber provided in some embodiments of the present application. The embodiments of the present application provide a vapor chamber for use in a battery, comprising: a first plate 1 having a first end 11; a second plate 2 connected to the first end 11 and arranged at an angle to the first plate 1. Along the extension direction of the first plate 1, the second plate 2 has a first surface 21 facing away from the first plate 1, and a through-groove 3 is defined in the first surface 21.

[0040] When the battery is working, a large amount of heat and gas will be generated inside the battery. Heat accumulation is likely to occur between the core packs 4, which may even cause fire and explosion, resulting in personal danger and property loss. Therefore, it is necessary to avoid heat accumulation inside the battery as much as possible. Figure 1In this embodiment, the vapor chamber includes a first plate 1 and a second plate 2 arranged at an angle. Both the first plate 1 and the second plate 2 can contact the core pack 4, effectively balancing the heat within the core pack 4. Furthermore, the through-slot 3 formed on the first surface 21 of the second plate 2 facilitates the rapid exhaust of gas from the battery. This prevents the core pack 4 from being affected by gravity, causing the exhaust passage to narrow (or even clogging the explosion-proof valve) and preventing the timely exhaust of high-heat gas, which would increase safety risks, in the event of thermal runaway. For example, the vapor chamber in this embodiment can be a liquid cooling plate.

[0041] Please refer to Figures 2 to 4 , Figure 2 It is a three-dimensional schematic diagram of the heat spreader provided in other embodiments of the present application. Figure 3 yes Figure 2 Side view of the vapor chamber shown, Figure 4 yes Figure 2 In one embodiment of the present application, the first plate 1 and the second plate 2 are connected in an L-shape.

[0042] In the embodiment of the present application, the first plate 1 and the second plate 2 are connected in an L-shape, thereby increasing the contact area between the first plate 1, the second plate 2 and the core package, thereby maximizing the use of the first plate 1 and the second plate 2 to balance the heat of the core package 4 and reducing the risk of thermal runaway caused by heat accumulation in the core package 4.

[0043] In one embodiment of the present application, the through groove 3 includes a first groove 22. In the first direction, the first groove 22 passes through the opposite sides of the second plate body 2. The first groove 22 also passes through the side surface of the second plate body 2 connected to the first plate body 1.

[0044] When a battery experiences thermal runaway, it will generate a large amount of heat and gas. This heat will cause the electrolyte inside the battery to vaporize rapidly, resulting in a pressure difference between the inside and outside of the battery. The internal space of the battery is limited. If a large amount of gas is not discharged in time, it may cause the battery to deform or explode. Therefore, these gases need to be discharged as soon as possible. The core pack inside the battery may cause the exhaust channel to narrow (or even block the exhaust port) under the action of gravity, ultimately affecting the exhaust of gas. In this embodiment, by opening a first groove 22 on the second plate 2 (which will not be blocked or occupied by the core pack), the gas can be discharged from the battery through the first groove 22, ultimately reducing the risk of thermal runaway of the battery.

[0045] In one embodiment of the present application, the through groove 3 further includes a second groove 23, which is arranged at an angle to the first groove 22 and is connected to each other; and / or, in the second direction, the second groove 23 passes through the opposite sides of the second plate body 2.

[0046] Please continue to refer to Figures 2 to 4In this embodiment, the second groove 23 is set at an angle to the first groove 22, which is conducive to the gas from different directions to converge at the through groove 3, and the first groove 22 and the second groove 23 are connected to facilitate the flow of gas in the through groove 3, which can accelerate the discharge of gas from different directions inside the battery and help ensure the safety of the battery.

[0047] For example, in this embodiment, the angle between the first groove 22 and the second groove 23 is 90°, and the first groove 22 is symmetrical with respect to the second groove 23. Obviously, the angle between the first groove 22 and the second groove 23, as well as the position of the second groove 23 on the second plate 2 in the above embodiment are merely examples and do not constitute limitations on the present application.

[0048] In one embodiment of the present application, at least one reinforcing rib 24 is provided in the second groove 23 , and an extending direction of the at least one reinforcing rib 24 is parallel to the axial direction of the second groove 23 .

[0049] In order to increase the exhaust speed of the battery, a second groove 23 is opened on the second plate 2 in the embodiment of the present application. The thickness of the second plate 2 where the second groove 23 is opened is reduced, and the strength is also affected. Therefore, when the battery thermal runaway occurs, the large amount of heat and gas generated may cause deformation in the second groove 23, affecting the exhaust speed of the battery. Therefore, in this embodiment, a reinforcing rib 24 is set in the second groove 23 to reduce the possibility of deformation in the second groove 23 and ensure the exhaust speed of the battery. Please continue to refer to Figures 2 to 4 In this embodiment, three reinforcing ribs 24 are provided in the second groove 23, and these three reinforcing ribs 24 are evenly distributed in the second groove 23, which can reduce the strength difference among different parts of the second groove 23 and further reduce the possibility of deformation in the second groove 23. Obviously, the number and position of the reinforcing ribs 24 in the above embodiment are only examples and do not constitute a limitation of this application.

[0050] In one embodiment of the present application, one end of at least one reinforcing rib 24 away from the first groove 22 is aligned with the side of the second plate 2 away from the first groove 22; and / or, the length of at least one reinforcing rib 24 is less than the length of the second groove 23.

[0051] A large amount of gas generated during thermal runaway of the battery is discharged from the battery through the second groove 23. Therefore, when arranging the reinforcing rib 24 in the second groove 23, the influence of the reinforcing rib 24 on the exhaust capacity of the second groove 23 should be reduced or avoided. Figure 4In this embodiment, the length of the reinforcing rib 24 is made shorter than the length of the second groove 23, which can ensure the strength of the second plate 2 at the second groove 23 and the exhaust capacity of the second groove 23. At the same time, in this embodiment, by aligning the end of the reinforcing rib 24 away from the first groove 22 with the side of the second plate 2 away from the first groove 22, the influence of the reinforcing rib 24 on the exhaust capacity of the first groove 22 can also be avoided, thereby ultimately reducing the risk of thermal runaway of the battery.

[0052] On the other hand, an embodiment of the present application provides a battery, including the above-mentioned heat spreader, and also including: a shell 5; a core pack 4, arranged in the shell 5, having a first heat dissipation surface 41 and a second heat dissipation surface 42 connected to each other; the heat spreader is arranged in the shell 5, and the first plate body 1 is in contact with the first heat dissipation surface 41, and the second plate body 2 is in contact with the second heat dissipation surface 42.

[0053] In the related art, a heat dissipation component is usually set outside the battery, but this heat dissipation method has little effect on alleviating the heat accumulation inside the battery. Figure 5 This is a schematic diagram of the structure of the battery provided in some embodiments of the present application, please refer to Figure 5 In this embodiment, the heat spreader is arranged inside the battery, and the first plate 1 and the second plate 2 of the heat spreader are in contact with the core pack 4, which can increase the contact area between the core pack 4 and the heat spreader, balance the heat of the core pack 4, and thus reduce the risk of thermal runaway of the battery.

[0054] Please refer to Figure 6 , Figure 6 Schematic diagram of the structure of the battery housing provided in some embodiments of the present application. In one embodiment of the present application, the housing 5 has a second surface 51, which is adjacent to the through slot 3. The battery also includes an explosion-proof valve 6, which is disposed on the second surface 51.

[0055] A mounting hole is provided on the second surface 51 of the shell 5, and the explosion-proof valve 6 is installed in the mounting hole. In this embodiment, by installing the explosion-proof valve 6 on the second surface 51 close to the through groove 3, the gas in the through groove 3 can be quickly discharged from the battery through the explosion-proof valve 6, thereby reducing the risk of thermal runaway of the battery.

[0056] In one embodiment of the present application, the battery includes two vapor chambers, the first plates 1 of the two vapor chambers are in contact with each other, the second plates 2 of the two vapor chambers are in contact with each other, and the through grooves 3 of the two vapor chambers are interconnected.

[0057] In this embodiment, the through-slots 3 of the two vapor chambers are interconnected, which facilitates gas flow within the through-slots 3 to the explosion-proof valve 6 and subsequent discharge through the explosion-proof valve 6. Furthermore, by bringing the first plates 1 of the two vapor chambers into contact, the two core packs 4 in contact with the two vapor chambers no longer contact each other, reducing the heat between the core packs 4 and the risk of thermal runaway in the battery.

[0058] Please refer to Figure 7 , Figure 7 Schematic diagram of the exhaust area provided in some embodiments of the present application. In one embodiment of the present application, two through slots 3 constitute the exhaust area 200, and in the third direction, the projection of the explosion-proof valve 6 is located in the exhaust area 200.

[0059] The exhaust area 200 is formed by the through grooves 3 of the two heat sinks, and the explosion-proof valve 6 is set at a position corresponding to the exhaust area 200. The gas in the exhaust area 200 can be quickly discharged through the explosion-proof valve 6, ultimately reducing the risk of thermal runaway of the battery.

[0060] In order to improve the gas exhaust efficiency inside the battery, the exhaust flow rate of the explosion-proof valve 6 should be increased. For example, in this embodiment, the explosion-proof valve 6 is set in the communication area of ​​the two second through grooves 3 of the two heat sinks.

[0061] In one embodiment of the present application, the core pack 4 has a third surface, a fourth surface and a fifth surface. The first heat dissipation surface 41, the third surface, the fourth surface and the fifth surface are connected end to end in sequence and are all connected to the second heat dissipation surface 42. The battery also includes an insulating film 7, which is coated on the first heat dissipation surface 41, the third surface, the fourth surface and the fifth surface.

[0062] To ensure battery performance and stability, in this embodiment, the first heat dissipation surface 41, the third surface, the fourth surface, and the fifth surface of the core pack 4 are covered with an insulating film 7. For example, the insulating film 7 in this embodiment is made of an insulating material on one side and a self-adhesive adhesive on the other side. The self-adhesive adhesive is used to adhere the insulating film 7 to the first heat dissipation surface 41, the third surface, the fourth surface, and the fifth surface.

[0063] Please refer to Figure 8 , Figure 8 In one embodiment of the present application, the second heat dissipation surface 42 includes a first area and a second area surrounding the first area, the first area is in contact with the second plate 2, and the second area is covered with an insulating film 7.

[0064] By covering the surface of the core package 4 with an insulating film 7, the battery's performance and stability can be guaranteed. To ensure a stable connection between the insulating film 7 and the core package 4, the width of the insulating film 7 should not be too narrow to reduce the possibility of the insulating film 7 slipping off the second heat dissipation surface 42. The insulating film 7 should also not cover the first surface 21 of the second plate 2. If the insulating film 7 covers the first surface 21, it will affect the heat dissipation and exhaust performance of the second plate 2.

[0065] Illustratively, in this embodiment, the width of the second region is greater than or equal to 3 mm.

[0066] Please refer to Figure 9 , Figure 9 Schematic diagram of the structure of the battery provided by some other embodiments of the present application. In one embodiment of the present application, the housing 5 has an opening, and the battery further includes a top cover assembly 8, which closes the opening.

[0067] In this embodiment, the top cover assembly 8 and the explosion-proof valve 6 are arranged on two opposite surfaces of the housing 5, so that the exhaust capacity is not affected when the battery is working normally.

[0068] To ensure the performance and stability of the battery, the insulating film 7 is bonded to the lower portion of the top cover assembly 8, with a bonding height of at least 2 mm. The distance between the insulating film 7 and the aluminum cover sheet included in the top cover assembly 8 is greater than or equal to 1 mm.

[0069] On the other hand, an embodiment of the present application provides a battery module including the above-mentioned battery.

[0070] The above is a detailed introduction to the embodiments of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. At the same time, for those skilled in the art, based on the ideas of the present application, there may be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A heat sink, used for batteries, characterized in that: include: A first plate having a first end; The second plate is connected to the first end and is arranged at an angle to the first plate. Along the extension direction of the first plate, the second plate has a first surface facing away from the first plate, and the first surface is provided with a through groove.

2. The vapor chamber according to claim 1, wherein: The first plate body and the second plate body are connected in an L-shape.

3. The vapor chamber according to claim 2, wherein: The through groove includes a first groove. In a first direction, the first groove passes through two opposite sides of the second plate body. The first groove also passes through a side surface of a side where the second plate body is connected to the first plate body.

4. The vapor chamber according to claim 3, wherein: The through groove further includes a second groove, which is arranged at an angle to the first groove and is connected to each other; and / or, in the second direction, the second groove passes through opposite sides of the second plate body.

5. The vapor chamber according to claim 4, wherein: At least one reinforcing rib is provided in the second groove, and an extending direction of the at least one reinforcing rib is parallel to an axial direction of the second groove.

6. The vapor chamber according to claim 5, wherein: One end of the at least one reinforcing rib away from the first groove is aligned with the side of the second plate away from the first groove; and / or the length of the at least one reinforcing rib is smaller than the length of the second groove.

7. A battery, characterized in that: The vapor chamber according to any one of claims 1 to 6, further comprising: case; A core package is disposed in the housing and has a first heat dissipation surface and a second heat dissipation surface connected thereto; The heat spreader is disposed in the housing, and the first plate body is in contact with the first heat dissipation surface, and the second plate body is in contact with the second heat dissipation surface.

8. The battery according to claim 7, characterized in that The shell has a second surface, the second surface is close to the through groove, and the battery further includes an explosion-proof valve, which is arranged on the second surface.

9. The battery according to claim 8, characterized in that The battery includes two vapor chambers, the first plates of the two vapor chambers are in contact with each other, the second plates of the two vapor chambers are in contact with each other, and the through grooves of the two vapor chambers are connected with each other.

10. The battery according to claim 9, characterized in that The two through grooves constitute an exhaust area, and in the third direction, the projection of the explosion-proof valve is located in the exhaust area.

11. The battery according to claim 7, characterized in that The core package has a third surface, a fourth surface and a fifth surface. The first heat dissipation surface, the third surface, the fourth surface and the fifth surface are connected end to end in sequence and are all connected to the second heat dissipation surface. The battery also includes an insulating film, which is coated on the third surface, the fourth surface and the fifth surface.

12. The battery according to claim 11, characterized in that The second heat dissipation surface includes a first area and a second area surrounding the first area, the first area is in contact with the second plate body, and the second area is covered with the insulating film.

13. The battery according to claim 7, characterized in that The housing has an opening, and the battery further includes a top cover assembly that closes the opening.

14. A battery module, characterized in that: Comprising the battery according to any one of claims 7 to 13.

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