Drain valve capable of being automatically opened at constant temperature and battery pack thereof

Abstract

The utility model discloses a drainage valve capable of being automatically opened at a constant temperature and a battery pack thereof. The drainage valve comprises a valve main body, a locking structure, a valve body frame, a glass bulb, a check valve core, an elastic piece and a sealing structure, the valve body main body is arranged at a liquid outlet of the battery pack, the valve body main body is of a hollow cylindrical structure with an opening in one end, and the locking structure is arranged on the outer end face of the valve body main body and used for locking the valve body main body on the battery pack; a valve body frame is fixedly arranged at the end, facing the interior of the battery pack, of the valve body main body, a glass bulb and a check valve element are sequentially arranged between the valve body frame and the valve body main body, one end of an elastic piece in a compressed state is arranged on the valve body main body, and the other end of the elastic piece is arranged on the check valve element. Through the arrangement of the valve body main body, the locking structure, the valve body frame, the glass bulb, the check valve core, the elastic piece and the sealing structure, after cooling liquid in a battery pack reaches a set temperature, the drain valve is automatically opened to drain the cooling liquid, so that thermal runaway of a battery cell is inhibited.

Description

Technical Field

[0001] The utility model relates to the technical field of fire protection, in particular to a drain valve that opens automatically at a constant temperature and a battery pack thereof. Background Art

[0002] At present, energy storage battery packs need to be designed with fire extinguishing systems. Some fire extinguishing solutions involve injecting low-temperature coolant into the battery pack to extinguish the fire. After the battery pack is filled with low-temperature coolant, the battery cells that experience thermal runaway are completely immersed. The large amount of heat generated by the thermal runaway of the battery cells is absorbed by the low-temperature coolant, causing the coolant to remain in a high-temperature state and unable to continue absorbing heat. The cooling water's ability to suppress the spread of thermal runaway will be reduced.

[0003] Therefore, it is urgent to propose a new solution to solve the above problems. Summary of the Invention

[0004] The utility model provides a drain valve that opens automatically at a constant temperature and a battery pack thereof, which can solve the problem in the prior art that after a battery cell thermally runs away, the coolant remains in a high temperature state and cannot continue to absorb heat.

[0005] The utility model provides a drain valve that opens automatically at a constant temperature, comprising a valve body, a locking structure, a valve body frame, a glass bulb, a check valve core, an elastic member and a sealing structure;

[0006] The valve body is provided at the liquid outlet of the battery pack. The valve body is a hollow cylindrical structure with one end open. The locking structure is provided on the outer end surface of the valve body and is used to lock the valve body on the battery pack.

[0007] A valve body frame is fixedly provided at the end of the valve body body facing the interior of the battery pack, and a glass bulb and a check valve core are sequentially arranged between the valve body frame and the valve body body. One end of the elastic member in a compressed state is arranged on the valve body body, and the other end is arranged on the check valve core.

[0008] Furthermore, the valve body includes a cylindrical portion and a cover portion that are fixedly connected, and the locking structure is provided on the outer end surface of the cylindrical portion.

[0009] Furthermore, the check valve core includes a raised portion, a middle portion and a round rod portion that are fixedly connected in sequence. The raised portion is arranged close to one side of the glass bulb, and a first round groove for inserting the glass bulb is formed on the raised portion.

[0010] Furthermore, a sleeve portion is provided on one side of the cover portion close to the round rod portion, and a second circular groove for the round rod portion to be inserted is provided on the sleeve portion.

[0011] Furthermore, a circular ring is embedded in the valve body frame on a side close to the glass bulb, and the circular ring is used to lock the glass bulb.

[0012] Furthermore, the locking structure includes an external thread provided on the outer end surface of the cylindrical portion and a locking nut with an internal thread that is locked with the external thread.

[0013] Furthermore, the sealing structure includes a first sealing ring, a second sealing ring and a third sealing ring. The cylindrical portion is vertically provided with a step surface corresponding to the interior of the battery pack. The outer peripheral surface of the middle portion is arc-shaped. The first sealing ring is arranged between the side wall of the battery pack and the end face of the locking nut. The second sealing ring is arranged between the side wall of the battery pack and the step surface. The third sealing ring is arranged between the middle portion and the valve body.

[0014] Furthermore, a first protrusion is provided at the end of the cylindrical portion away from the cover portion, the first protrusion protrudes toward the side close to the glass bulb, and the third sealing ring is provided between the outer peripheral surface of the middle portion and the first protrusion.

[0015] Furthermore, an opening is provided on the cover plate portion for the coolant to flow through, and a drip hole for collecting the coolant is provided below the cover plate portion.

[0016] The utility model also provides a battery pack, comprising the above-mentioned drain valve that automatically opens at a constant temperature.

[0017] Compared with the existing technology, the utility model provides a drain valve that automatically opens at a fixed temperature at the liquid outlet of the battery pack. By arranging the valve body, locking structure, valve body frame, glass bulb, check valve core, elastic part and sealing structure, the liquid outlet can be sealed when the coolant in the battery pack has not reached the set temperature. After the coolant in the battery pack reaches the set temperature, when the liquid pressure exceeds the spring force, the drain valve will automatically open to discharge it. By continuously injecting low-temperature water, heat can be continuously taken away, thereby suppressing thermal runaway of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the overall structure of the battery pack of the utility model;

[0019] Figure 2 This is a cross-sectional view of the utility model's drain valve that automatically opens at a constant temperature;

[0020] Figure numerals: 1. Valve body; 11. Cylindrical portion; 111. First protrusion; 112. Step surface; 12. Cover portion; 121. Socket portion; 2. Locking structure; 21. External thread; 22. Locking nut; 3. Valve body frame; 31. Ring; 4. Glass bulb; 5. Check valve core; 51. Protrusion; 52. Middle portion; 53. Round rod portion; 6. Elastic part; 7. Sealing structure; 71. First sealing ring; 72. Second sealing ring; 73. Third sealing ring; 8. Battery pack; 81. Liquid inlet; 82. Liquid outlet. DETAILED DESCRIPTION

[0021] In order to further understand the content, features and effects of the present invention, the following examples are given in conjunction with the attached Figures 1-2 Detailed instructions are as follows.

[0022] like Figures 1-2 As shown, this embodiment provides a drain valve that automatically opens at a constant temperature, including a valve body 1, a locking structure 2, a valve body frame 3, a glass bulb 4, a check valve core 5, an elastic member 6 and a sealing structure 7;

[0023] The valve body 1 is disposed at the liquid outlet 82 of the battery pack 8. The battery pack 8 is also provided with a liquid inlet 81. The valve body 1 is a hollow cylindrical structure with one end open. The locking structure 2 is disposed on the outer end surface of the valve body 1 and is used to lock the valve body 1 on the battery pack 8.

[0024] A valve body frame 3 is fixedly provided at the end of the valve body main body 1 facing the inside of the battery pack 8, and a glass bulb 4 and a check valve core 5 are sequentially arranged between the valve body frame 3 and the valve body main body 1. One end of the elastic member 6 in a compressed state is arranged on the valve body main body 1, and the other end is arranged on the check valve core 5.

[0025] Compared with the existing technology, the utility model provides a drain valve that automatically opens at a fixed temperature at the liquid outlet of the battery pack. By arranging the valve body, locking structure, valve body frame, glass bulb, check valve core, elastic part and sealing structure, the liquid outlet can be sealed when the coolant in the battery pack has not reached the set temperature. After the coolant in the battery pack reaches the set temperature, when the liquid pressure exceeds the spring force, the drain valve will automatically open to discharge it. By continuously injecting low-temperature water, heat can be continuously taken away, thereby suppressing thermal runaway of the battery cell.

[0026] In this embodiment, Figure 2 As shown, the valve body 1 includes a fixedly connected cylindrical portion 11 and a cover portion 12 , and the locking structure 2 is arranged on the outer end surface of the cylindrical portion 11 . The locking structure 2 fixes the drain valve as a whole at the liquid outlet 82 of the battery pack 8 .

[0027] In this embodiment, Figure 2 As shown, the check valve core 5 includes a raised portion 51, a middle portion 52 and a round rod portion 53 fixedly connected in sequence. The raised portion 51 is arranged close to the glass bulb 4. The raised portion 51 is provided with a first circular groove for inserting the glass bulb 4 to accommodate the glass bulb 4.

[0028] In this embodiment, Figure 2 As shown, the cover portion 12 is provided with a sleeve portion 121 on one side close to the round rod portion 53 , and the sleeve portion 121 is provided with a second circular groove for the round rod portion 53 to be inserted into.

[0029] In this embodiment, Figure 2 As shown, a circular ring 31 is embedded on the side of the valve body frame 3 close to the glass bulb 4. The circular ring 31 is made of copper. The glass bulb 4 can be tightened and fixed by shrinking the circular ring 31, and the glass bulb 4 can be further limited by cooperating with the first circular groove.

[0030] In this embodiment, Figure 2 As shown, the locking structure 2 includes an external thread 21 provided on the outer end surface of the cylindrical portion 11 and a locking nut 22 with an internal thread that is locked with the external thread 21, so as to facilitate fixing the drain valve on the side wall of the battery pack 8. In addition, the threaded connection is adopted to facilitate later replacement.

[0031] In this embodiment, Figure 2 As shown, the sealing structure 7 includes a first sealing ring 71, a second sealing ring 72, and a third sealing ring 73. The cylindrical portion 11 is provided with a vertical step surface 112 corresponding to the interior of the battery pack 8. The outer peripheral surface of the intermediate portion 52 is arc-shaped. The first sealing ring 71 is provided between the side wall of the battery pack 8 and the end face of the lock nut 22. The second sealing ring 72 is provided between the side wall of the battery pack 8 and the step surface 112. The third sealing ring 73 is provided between the intermediate portion 52 and the valve body 1. The first and second sealing rings 71 and 72 prevent coolant from flowing from the cylindrical portion 11 to the outside of the battery pack 8, while the third sealing ring 73 prevents coolant from flowing out between the intermediate portion 52 and the valve body 1.

[0032] In this embodiment, Figure 2 As shown, a first protrusion 111 is provided at the end of the cylindrical portion 11 away from the cover portion 12. The first protrusion 111 protrudes toward the side close to the glass bulb 4. The third sealing ring 73 is provided between the outer peripheral surface of the middle portion 52 and the first protrusion 111. The provision of the first protrusion 111 and the middle portion 52 facilitates the provision of the third sealing ring 73, thereby preventing the coolant from flowing out.

[0033] In this embodiment, Figure 2As shown, the cover plate portion 12 is provided with an opening for the coolant to flow through, and a drip hole for collecting the coolant is provided below the cover plate portion 12 .

[0034] In this embodiment, the glass bulb is a 79° glass bulb; 97° or 105° glass bulbs may also be selected depending on the actual situation. The elastic member 6 is a spring, one end of which is fixed to the end surface of the sleeve portion 121 and the other end to the end surface of the middle portion 52. Under normal conditions, the supporting force between the glass bulb 4 and the valve body frame 3 maintains the overall stability of the drain valve, and all three sealing rings are sealed. The battery pack as a whole has an IP67 protection rating, where the 6 represents the dustproof rating of IP6X and the 7 represents the waterproof rating of IPX7. When the coolant temperature rises above 79°, the glass bulb 4 instantly ruptures. The spring remains compressed, but the check valve core 5 remains fully movable. When the liquid pressure on the left exceeds the spring force, the check valve core 5 is pressed rightward, causing the coolant to flow through the gap between the middle portion 52 and the first protrusion 111. The third sealing ring 73 loses its function, allowing the coolant to drain through the opening in the cover portion 12 and into the drip chamber below.

[0035] The utility model also provides a battery pack, comprising the above-mentioned drain valve that automatically opens at a constant temperature.

[0036] The utility model described above only expresses the implementation methods of the utility model embodiments and should not be construed as limiting the scope of the utility model patent, nor does it impose any formal restrictions on the structure of the utility model embodiments. It should be pointed out that for those skilled in the art, without departing from the concept of the utility model embodiments, several changes and improvements can be made, which fall within the scope of protection of the utility model embodiments.

Claims

1. A drain valve that opens automatically at a constant temperature, characterized by: It comprises a valve body (1), a locking structure (2), a valve body frame (3), a glass bulb (4), a check valve core (5), an elastic member (6) and a sealing structure (7); The valve body (1) is arranged at the liquid outlet (82) of the battery pack (8); the valve body (1) is a hollow cylindrical structure with one end open; the locking structure (2) is arranged on the outer end surface of the valve body (1) and is used to lock the valve body (1) on the battery pack (8); A valve body frame (3) is fixedly provided at the end of the valve body main body (1) facing the interior of the battery pack (8), a glass bulb (4) and a check valve core (5) are sequentially provided between the valve body frame (3) and the valve body main body (1), and one end of the elastic member (6) in a compressed state is provided on the valve body main body (1), and the other end is provided on the check valve core (5).

2. The drain valve that automatically opens at a constant temperature according to claim 1, characterized in that: The valve body (1) comprises a fixedly connected cylindrical portion (11) and a cover plate portion (12), and the locking structure (2) is arranged on the outer end surface of the cylindrical portion (11).

3. The drain valve that automatically opens at a constant temperature according to claim 2, characterized in that: The check valve core (5) comprises a raised portion (51), an intermediate portion (52) and a round rod portion (53) which are fixedly connected in sequence. The raised portion (51) is arranged close to one side of the glass bulb (4). A first round groove for inserting the glass bulb (4) is provided on the raised portion (51).

4. The constant temperature automatic opening drain valve according to claim 3, characterized in that: A sleeve portion (121) is provided on one side of the cover portion (12) close to the round rod portion (53), and a second circular groove for the round rod portion (53) to be inserted is provided on the sleeve portion (121).

5. The constant temperature automatic opening drain valve according to claim 3, characterized in that: A circular ring (31) is embedded on the valve body frame (3) at a side close to the glass bulb (4), and the circular ring (31) is used to lock the glass bulb (4).

6. The constant temperature automatic opening drain valve according to claim 3, characterized in that: The locking structure (2) comprises an external thread (21) provided on the outer end surface of the cylindrical portion (11) and a locking nut (22) with an internal thread that is locked with the external thread (21).

7. The constant temperature automatic opening drain valve according to claim 6, characterized in that: The sealing structure (7) includes a first sealing ring (71), a second sealing ring (72) and a third sealing ring (73); the cylindrical portion (11) is vertically provided with a step surface (112) corresponding to the interior of the battery pack (8); the outer peripheral surface of the middle portion (52) is in an arc shape; the first sealing ring (71) is provided between the side wall of the battery pack (8) and the end face of the locking nut (22); the second sealing ring (72) is provided between the side wall of the battery pack (8) and the step surface (112); and the third sealing ring (73) is provided between the middle portion (52) and the valve body (1).

8. The drain valve that automatically opens at a constant temperature according to claim 7, characterized in that: A first protrusion (111) is provided at the end of the cylindrical portion (11) away from the cover portion (12), and the first protrusion (111) protrudes toward the side close to the glass bulb (4). The third sealing ring (73) is provided between the outer peripheral surface of the middle portion (52) and the first protrusion (111).

9. The drain valve that automatically opens at a constant temperature according to claim 2, characterized in that: An opening for the coolant to flow through is provided on the cover plate portion (12), and a drip for collecting the coolant is provided below the cover plate portion (12).

10. A battery pack comprising the drain valve that automatically opens at a constant temperature as claimed in any one of claims 1 to 9.

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