A battery pack

Abstract

The embodiment of the present invention provides a battery pack, which relates to the field of battery technology. The battery pack includes a box, a battery cell, an exhaust groove and a plugging cover; there are multiple battery cells, all of which are arranged in the box, and each battery cell has an explosion-proof valve; the exhaust groove is arranged in the box, and multiple exhaust holes are opened on the exhaust groove, and the multiple exhaust holes are matched with the positions of multiple explosion-proof valves one by one; there are multiple plugging covers, and the multiple plugging covers are arranged in the multiple exhaust holes one by one, and the plugging covers are separated from the exhaust holes when the corresponding explosion-proof valve exhausts and impacts, which can prevent the thermal runaway and diffusion of the battery cell from occurring.

Description

Technical Field

[0001] The present invention relates to the field of battery technology, and in particular to a battery pack. Background Art

[0002] An existing battery pack generally includes multiple battery cells. When a battery cell experiences thermal runaway, the gas needs to be discharged through an explosion-proof valve. However, in the process of discharging the gas from the battery cell experiencing thermal runaway, it is easy to cause thermal runaway in other battery cells, and the thermal runaway of the battery cell is easy to spread. Summary of the invention

[0003] The purpose of the present invention includes, for example, providing a battery pack that can prevent the occurrence of thermal runaway and spread of battery cells.

[0004] The embodiments of the present invention can be implemented as follows:

[0005] An embodiment of the present invention provides a battery pack, which includes a box body, a battery cell, an exhaust groove and a plug cover;

[0006] There are multiple battery cells, each of which is arranged in the box, and each of which has an explosion-proof valve;

[0007] The exhaust groove is arranged in the box body, and a plurality of exhaust holes are opened on the exhaust groove, and the positions of the plurality of exhaust holes are matched one by one with the positions of the plurality of explosion-proof valves;

[0008] There are multiple plugging covers, which are arranged in a one-to-one correspondence in the multiple exhaust holes. The plugging covers are separated from the exhaust holes when the corresponding explosion-proof valves are exhausted.

[0009] Optionally, a protrusion is provided in the exhaust hole, and a slot is provided on the blocking cover, and the slot is engaged with the protrusion.

[0010] Optionally, a first flange and a second flange are provided on the outer wall of the blocking cover, the first flange and the second flange are both arranged around the circumference of the blocking cover, the slot is formed between the first flange, the second flange and the outer wall of the blocking cover, and the protrusion is arranged along the circumference of the exhaust hole.

[0011] Optionally, the first flange is arranged close to the explosion-proof valve, the length of the first flange extending out of the plugging cover is shorter than the length of the second flange extending out of the plugging cover, and the thickness of the second flange is greater than the thickness of the first flange.

[0012] Optionally, the first flange is flush with an end surface of the plugging cover facing the explosion-proof valve, and the second flange is flush with an end surface of the plugging cover facing away from the explosion-proof valve.

[0013] Optionally, there is a height difference between an end surface of the blocking cover facing the explosion-proof valve and an end surface of the exhaust groove facing the explosion-proof valve.

[0014] Optionally, the exhaust hole is in a rectangular, circular or elliptical shape.

[0015] Optionally, the box body includes a box frame, a bottom guard plate and a top cover, the bottom guard plate and the top cover are relatively arranged on the box frame, the bottom guard plate, the top cover and the box frame form a cavity for accommodating the battery cell, and the exhaust groove is arranged between the bottom guard plate and the battery cell.

[0016] Optionally, the exhaust groove includes a top plate and two oppositely arranged side plates, the top plate is connected between the two side plates, the exhaust hole is opened on the top plate, the two side plates are supported by the bottom guard plate, and the bottom guard plate, the top plate and the two side plates form a channel for gas circulation.

[0017] Optionally, a plurality of the exhaust holes are evenly spaced apart and arranged on the top plate.

[0018] The beneficial effects of the battery pack of the embodiment of the present invention include, for example: in order to prevent the spread of thermal runaway of the battery cell, an exhaust groove is arranged in the box body, and a plurality of exhaust holes are opened on the exhaust groove, and a plugging cover is arranged in each exhaust hole, and each exhaust hole matches the position of one of the explosion-proof valves. When thermal runaway occurs in one of the battery cells, the exhaust of the battery cell through its own explosion-proof valve impacts the corresponding plugging cover, so that the plugging cover is separated from the exhaust hole, and the gas can be discharged from the exhaust groove, and in this process, the remaining plugging covers can prevent the gas in the exhaust groove from contacting other battery cells, thereby preventing the spread of thermal runaway of the battery cells. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 This is a schematic diagram of an explosion of a battery pack in an embodiment of the present application;

[0021] Figure 2 It is a schematic diagram of the partial structure of the exhaust groove in the embodiment of the present application;

[0022] Figure 3 This is a partial cross-sectional view used to show that the plugging cover is disposed in the exhaust hole in the embodiment of the present application;

[0023] Figure 4 It is a schematic diagram of the structure of the blocking cover in the embodiment of the present application.

[0024] Icons: 100-box; 110-box frame; 120-bottom guard plate; 130-top cover; 200-battery cell; 300-exhaust groove; 310-exhaust hole; 320-protrusion; 330-top plate; 340-side plate; 400-blocking cover; 410-first flange; 420-second flange; 430-card slot. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0028] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear to indicate an orientation or position relationship, they are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the product of the invention is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0029] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0030] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0031] The inventor of the present application has found that after a battery cell experiences thermal runaway, high-temperature gas and flame need to be discharged through an explosion-proof valve. When the high-temperature gas and flame discharged from the thermal runaway battery cell contacts the explosion-proof valves of other battery cells, it is easy to cause thermal runaway in other battery cells, resulting in the spread of thermal runaway of the battery cells. This embodiment provides a battery pack, which is at least used to solve this technical problem.

[0032] Please refer to Figure 1-Figure 4 The present embodiment provides a battery pack, including a case 100, a battery cell 200, an exhaust groove 300 and a plugging cover 400; there are multiple battery cells 200, and the multiple battery cells 200 are all arranged in the case 100, and each battery cell 200 has an explosion-proof valve; the exhaust groove 300 is arranged in the case 100, and a plurality of exhaust holes 310 are opened on the exhaust groove 300, and the positions of the multiple exhaust holes 310 are matched one by one with the positions of the multiple explosion-proof valves; there are multiple plugging covers 400, and the multiple plugging covers 400 are arranged one by one in the multiple exhaust holes 310, and the plugging covers 400 are separated from the exhaust holes 310 when the corresponding explosion-proof valves are exhausted.

[0033] It should be pointed out that the multiple battery cells 200 form multiple rows, the number of exhaust grooves 300 is multiple, each row of battery cells 200 corresponds to an exhaust groove 300, and the length direction of the exhaust groove 300 is consistent with the arrangement direction of each row of battery cells 200. Multiple exhaust holes 310 are opened on each exhaust groove 300, and the multiple exhaust holes 310 on each exhaust groove 300 match the positions of multiple explosion-proof valves corresponding to a row of battery cells 200 one by one; a plugging cover 400 is provided in the exhaust hole 310 of each exhaust groove 300, and the plugging cover 400 is detached from the exhaust hole 310 when impacted by the exhaust of the explosion-proof valve. The material of the plugging cover 400 can be selected according to the actual working conditions, for example, a material with heat insulation, flame retardancy and sealing properties is selected to make the plugging cover 400.

[0034] In order to prevent the thermal runaway of the battery cell 200 from spreading, an exhaust groove 300 is provided in the box body 100, and a plurality of exhaust holes 310 are provided on the exhaust groove 300. A plugging cover 400 is provided in each exhaust hole 310, and each exhaust hole 310 matches the position of one of the explosion-proof valves. When one of the battery cells 200 has thermal runaway, the battery cell 200 uses its own explosion-proof valve to exhaust air to impact the corresponding plugging cover 400, so that the plugging cover 400 is separated from the exhaust hole 310, and the gas can be discharged from the exhaust groove 300. In this process, the remaining plugging covers 400 can prevent the gas in the exhaust groove 300 from contacting other battery cells 200, thereby preventing the thermal runaway of the battery cell 200 from spreading.

[0035] In an optional embodiment, a protrusion 320 is provided in the exhaust hole 310, and a slot 430 is provided on the plugging cover 400, and the slot 430 is engaged with the protrusion 320. When the battery pack is subjected to vibration and impact, the plugging cover 400 and the exhaust hole 310 are firmly engaged, and the plugging cover 400 will not fall off easily due to vibration and impact.

[0036] By engaging the slot 430 with the protrusion 320 , the plugging cover 400 is connected to the exhaust hole 310 to block the exhaust hole 310 , and the installation is convenient and quick.

[0037] In an optional embodiment, a first flange 410 and a second flange 420 are provided on the outer wall of the plugging cover 400, and the first flange 410 and the second flange 420 are both arranged around the circumference of the plugging cover 400. The slot 430 is formed between the first flange 410, the second flange 420 and the outer wall of the plugging cover 400, and the protrusion 320 is arranged along the circumference of the exhaust hole 310.

[0038] Since the first flange 410 and the second flange 420 are both arranged around the circumference of the plugging cover 400 , and the slot 430 is formed between the first flange 410 , the second flange 420 and the outer wall of the plugging cover 400 , the slot 430 is also arranged around the circumference of the plugging cover 400 .

[0039] In an optional embodiment, the first flange 410 is disposed close to the explosion-proof valve, the length of the first flange 410 extending out of the plugging cover 400 is less than the length of the second flange 420 extending out of the plugging cover 400, and the thickness of the second flange 420 is greater than the thickness of the first flange 410.

[0040] It should be noted that the plugging cover 400 has two opposite end faces, which are respectively facing or away from the explosion-proof valve. The extension direction of the first flange 410 and the second flange 420 is parallel to the end face of the plugging cover 400. Since the length of the first flange 410 extending out of the plugging cover 400 is smaller than the length of the second flange 420 extending out of the plugging cover 400, the first flange 410 and the second flange 420 have an end face difference B, and the contact area between the first flange 410 and the protrusion 320 is smaller than the contact area between the second flange 420 and the protrusion 320.

[0041] After a battery cell 200 experiences thermal runaway, the gas and flame after the runaway of the battery cell 200 are discharged through the explosion-proof valve. Since the contact area between the first flange 410 and the protrusion 320 is small and the thickness of the first flange 410 is small, the plugging cover 400 falls directly into the exhaust groove 300 after being impacted, and the gas in the battery cell 200 can be discharged through the exhaust groove 300. Since the contact area between the second flange 420 and the protrusion 320 is large and the thickness of the second flange 420 is large, the plugging cover 400 cooperates with the second flange 420 to better prevent the gas from impacting the explosion-proof valves of other battery cells 200, thereby reducing the risk of thermal runaway spreading.

[0042] In an optional embodiment, the first flange 410 is flush with the end surface of the plugging cover 400 facing the explosion-proof valve, and the second flange 420 is flush with the end surface of the plugging cover 400 facing away from the explosion-proof valve.

[0043] It should be pointed out that since the first flange 410 is flush with the end face of the plugging cover 400 facing the explosion-proof valve, and the second flange 420 is flush with the end face of the plugging cover 400 facing away from the explosion-proof valve, the sum of the areas of the surface of the first flange 410 facing the explosion-proof valve and the end face of the plugging cover 400 facing the explosion-proof valve is smaller than the sum of the areas of the surface of the second flange 420 facing away from the explosion-proof valve and the end face of the plugging cover 400 facing away from the explosion-proof valve.

[0044] In an optional embodiment, there is a height difference between the end surface of the blocking cover 400 facing the explosion-proof valve and the end surface of the exhaust groove 300 facing the explosion-proof valve.

[0045] It should be noted that the end face of the battery cell 200 provided with the explosion-proof valve abuts against the end face of the exhaust groove 300 facing the explosion-proof valve. Therefore, a height difference H also exists between the end face of the plugging cover 400 facing the explosion-proof valve and the end face of the battery cell 200 provided with the explosion-proof valve.

[0046] In an optional embodiment, the exhaust hole 310 is in a rectangular, circular or elliptical shape.

[0047] It is understandable that the shape of the exhaust hole 310 may be determined according to actual working conditions.

[0048] In an optional embodiment, the box body 100 includes a box frame 110, a bottom guard plate 120 and a top cover 130, the bottom guard plate 120 and the top cover 130 are relatively arranged on the box frame 110, the bottom guard plate 120, the top cover 130 and the box frame 110 form a cavity for accommodating the battery cell 200, and the exhaust groove 300 is arranged between the bottom guard plate 120 and the battery cell 200.

[0049] It should be noted that a channel for gas circulation is formed between the exhaust groove 300 and the bottom guard plate 120 .

[0050] In an optional embodiment, the exhaust groove 300 includes a top plate 330 and two oppositely arranged side plates 340, the top plate 330 is connected between the two side plates 340, the exhaust hole 310 is opened on the top plate 330, the two side plates 340 are supported on the bottom guard plate 120, and the bottom guard plate 120, the top plate 330 and the two side plates 340 form a channel for gas circulation.

[0051] When the plugging cover 400 in one of the exhaust holes 310 is broken open, the plugging cover 400 falls onto the bottom protective plate 120, and the gas can flow into the gas channel surrounded by the bottom protective plate 120, the top plate 330 and the two side plates 340, while the gas cannot break open the plugging covers 400 in other exhaust holes 310 and cannot contact the explosion-proof valves of other battery cells 200. The heat is isolated by the plugging cover 400, so thermal runaway diffusion is not likely to occur.

[0052] In an optional embodiment, a plurality of exhaust holes 310 are evenly spaced apart and opened on the top plate 330 .

[0053] It should be noted that each row of battery cells 200 is evenly spaced apart. To accommodate the arrangement of the battery cells 200 , a plurality of exhaust holes 310 are evenly spaced apart and opened on the top plate 330 .

[0054] In summary, an embodiment of the present invention provides a battery pack. In order to prevent the thermal runaway of a battery cell 200 from spreading, an exhaust groove 300 is arranged in a box body 100, and a plurality of exhaust holes 310 are opened on the exhaust groove 300. A plugging cover 400 is arranged in each exhaust hole 310, and each exhaust hole 310 matches the position of one of the explosion-proof valves. When thermal runaway occurs in one of the battery cells 200, the battery cell 200 exhausts air through its own explosion-proof valve to impact the corresponding plugging cover 400, so that the plugging cover 400 is separated from the exhaust hole 310, and the gas can be discharged from the exhaust groove 300, and in this process, the remaining plugging covers 400 can prevent the gas in the exhaust groove 300 from contacting other battery cells 200, thereby preventing the thermal runaway of the battery cell 200 from spreading.

[0055] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A battery pack, characterized in that: It comprises a box body (100), a battery cell (200), an exhaust groove (300) and a plugging cover (400); The box body (100) comprises a box body frame (110), a bottom guard plate (120) and a top cover (130); There are a plurality of battery cells (200), and the plurality of battery cells (200) are all arranged in the box (100), and each of the battery cells (200) has an explosion-proof valve; The exhaust groove (300) is arranged in the box body (100), the exhaust groove (300) is arranged between the bottom guard plate (120) and the battery cell (200), a plurality of exhaust holes (310) are opened on the exhaust groove (300), and the positions of the plurality of exhaust holes (310) and the plurality of explosion-proof valves are matched one by one; There are a plurality of blocking covers (400), and the plurality of blocking covers (400) are disposed in a one-to-one correspondence in the plurality of exhaust holes (310). The blocking covers (400) are separated from the exhaust holes (310) when the corresponding explosion-proof valves are exhausted. A protrusion (320) is provided in the exhaust hole (310), and a slot (430) is provided on the blocking cover (400), wherein the slot (430) is engaged with the protrusion (320); A first flange (410) and a second flange (420) are provided on the outer side wall of the plugging cover (400); the first flange (410) and the second flange (420) are both arranged around the circumference of the plugging cover (400); the first flange (410), the second flange (420) and the outer side wall of the plugging cover (400) form the clamping groove (430); and the protrusion (320) is arranged along the circumference of the exhaust hole (310); The first flange (410) is arranged close to the explosion-proof valve, the length of the first flange (410) extending out of the plugging cover (400) is shorter than the length of the second flange (420) extending out of the plugging cover (400), and the thickness of the second flange (420) is greater than the thickness of the first flange (410).

2. The battery pack according to claim 1, characterized in that: The first flange (410) is flush with the end surface of the plugging cover (400) facing the explosion-proof valve, and the second flange (420) is flush with the end surface of the plugging cover (400) facing away from the explosion-proof valve.

3. The battery pack according to claim 1, characterized in that: There is a height difference between the end surface of the blocking cover (400) facing the explosion-proof valve and the end surface of the exhaust groove (300) facing the explosion-proof valve.

4. The battery pack according to claim 1, characterized in that: The exhaust hole (310) is in a rectangular, circular or elliptical shape.

5. The battery pack according to claim 1, characterized in that: The bottom guard plate (120) and the top cover (130) are arranged on the box frame (110) in a relative manner, and the bottom guard plate (120), the top cover (130) and the box frame (110) enclose a cavity for accommodating the battery cell (200).

6. The battery pack according to claim 5, characterized in that: The exhaust groove (300) includes a top plate (330) and two oppositely arranged side plates (340), the top plate (330) is connected between the two side plates (340), the exhaust hole (310) is opened on the top plate (330), the two side plates (340) are supported on the bottom guard plate (120), and the bottom guard plate (120), the top plate (330) and the two side plates (340) form a channel for gas circulation.

7. The battery pack according to claim 6, characterized in that: The plurality of exhaust holes (310) are evenly spaced apart and arranged on the top plate (330).

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