Battery box body with explosion-proof performance

Abstract

The utility model provides a battery box body with explosion-proof performance, and relates to the technical field of battery accommodating equipment. The explosion-proof battery box comprises a top cover, a bottom cover, a framework and an explosion-proof assembly, the top cover and the bottom cover can be buckled on the two sides of the framework respectively, a containing cavity is formed between the top cover and the bottom cover, the framework comprises a frame and a plurality of cross beams connected with the frame, and the cross beams are arranged at intervals and divide the interior of the containing cavity into a plurality of battery containing chambers suitable for containing batteries; a plurality of hollow inner cavities are formed in the frame, the inner wall of each hollow inner cavity is provided with a pressure relief opening leading to the outside and a communication opening communicated with the battery containing chamber, the explosion-proof assembly comprises a puncturing piece and a deformation film, the puncturing piece is arranged in the hollow inner cavity, and the deformation film is arranged at the communication opening and is suitable for blocking the communication opening; and when the deformation film is pressed to reach a preset pressure value, the deformation film can expand towards the hollow inner cavity and abut against the puncturing piece, so that the deformation film is punctured by the puncturing piece. The battery pack has the advantage that the space utilization rate in the battery pack can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of battery containing equipment, and in particular to a battery box with explosion-proof performance. Background Art

[0002] A battery pack is a battery container used to hold battery cells.

[0003] However, when a battery cell is short-circuited, overcharged, squeezed, or encounters other conditions that may lead to thermal runaway, the battery cell will generate and emit a large amount of smoke. If there are no effective explosion-proof measures in the battery pack, the smoke will gather inside the battery pack, causing the air pressure inside the pack to continue to rise, eventually causing the battery pack to bulge and explode, causing heavy losses to people and property in a short period of time.

[0004] The Chinese patent with the announcement number CN219498077U discloses a battery pack and a vehicle, including a pack body, a receiving cavity formed inside the pack body, and a plurality of single cells arranged in sequence in the same direction in the receiving cavity, and each single cell is connected to an explosion-proof valve on the same side to ensure that no matter which single cell in the receiving cavity has thermal runaway, the gas can be discharged from the battery pack through the corresponding explosion-proof valve. However, the above device needs to be provided with an explosion-proof valve on each single cell, which will occupy a lot of space in the receiving cavity, making the space utilization rate of the battery pack low.

[0005] In view of this, it is necessary to provide a battery box with explosion-proof performance. Utility Model Content

[0006] In order to solve the problem that when multiple explosion-proof valves are provided on a battery pack, a large amount of space in the battery pack is occupied, affecting the space utilization rate of the battery pack, the present application provides a battery box with explosion-proof performance.

[0007] The present application provides a battery box with explosion-proof performance, which adopts the following technical solution: a top cover, a bottom cover, a frame and an explosion-proof component, wherein the top cover and the bottom cover can be respectively buckled on both sides of the frame to form a receiving cavity between the top cover and the bottom cover, and the frame includes a frame and a plurality of cross beams connected to the frame, and the plurality of cross beams are arranged at intervals and divide the receiving cavity into a plurality of battery receiving chambers suitable for receiving batteries;

[0008] A plurality of hollow cavities are formed inside the frame, and a pressure relief port leading to the outside and a connecting port connected to the battery storage chamber are provided on the inner wall of each hollow cavity. The explosion-proof component includes a piercing member and a deformable membrane. The piercing member is arranged in the hollow cavity, and the deformable membrane is arranged at the connecting port and is suitable for blocking the connecting port. The deformable membrane is configured to expand from the connecting port into the hollow cavity and abut against the piercing member when the air pressure reaches a preset pressure value, so as to pierce the deformable membrane through the piercing member.

[0009] By adopting the above technical solution, the deformable membrane can seal the connecting port when maintaining the normal state, so that the accommodating chamber is relatively isolated from the external environment, so that external dust is not easy to enter the accommodating chamber from the connecting port, and has a dust-proof effect; when the air pressure in the accommodating chamber increases rapidly, the deformable membrane will be compressed and expand from the connecting port to the hollow inner cavity; when the air pressure in the accommodating chamber increases to a predetermined pressure value, the deformable membrane will abut against the piercing member and be pierced by the piercing member, so that the deformable membrane no longer forms a seal on the connecting port, so that the gas in the accommodating chamber can enter from the pressure relief port of the hollow inner cavity to The outside world can achieve the effect of rapid pressure reduction and explosion prevention; the multiple hollow cavities dispersed in the frame can ensure that no matter which battery cell in which battery housing chamber has thermal runaway, the smoke in the battery housing chamber can abut against the adjacent deformation membrane and enter the outside world after the deformation membrane is punctured, thereby avoiding the secondary thermal runaway caused by the smoke generated in a battery housing chamber spreading to other battery housing chambers; the design of the explosion-proof component is that the explosion-proof component only needs to occupy a small part of the space in the housing cavity, thereby improving the space utilization rate in the battery pack.

[0010] Specifically, the explosion-proof component also includes a pressure plate, which is formed with a yield opening matching the connecting opening, and a threaded hole is also opened on the inner wall of the frame. The pressure plate can be screwed to the frame and clamp the deformable membrane between the pressure plate and the frame.

[0011] By adopting the above technical solution, the pressure plate can clamp the deformable membrane between itself and the frame, and the gas in the accommodating cavity can directly contact the deformable membrane through the yielding port, so that the deformable membrane can expand from the connecting port to the hollow inner cavity when under pressure, thereby ensuring that when the air pressure in the accommodating cavity rises to a predetermined pressure value, the deformable membrane will abut against the puncture member and be punctured by the puncture member.

[0012] Furthermore, an upper connection hole is formed on the top wall of the hollow inner cavity, a top connection hole corresponding to the upper connection hole is formed on the top cover, a lower connection hole is formed on the bottom wall of the hollow inner cavity, and a bottom connection hole corresponding to the lower connection hole is formed on the bottom cover;

[0013] The piercing member is a limiting bolt, and a plurality of piercing heads are formed in the middle portion of the limiting bolt along the outer circumference of the screw rod. The limiting bolt can sequentially pass through the top connecting hole, the upper connecting hole, the lower connecting hole and the bottom connecting hole and be screwed to the nut. The piercing head is located in the hollow inner cavity and matches the position of the connecting port.

[0014] By adopting the above technical solution, the limiting bolt can cooperate with the nut to fix the top cover and the bottom cover on both sides of the frame respectively; after the limiting bolt is installed in place, the puncture head is just located at a position in the hollow inner cavity that matches the connecting port, thereby ensuring that the deformation membrane will abut against the puncture head and be punctured by the puncture head after expansion; the multiple puncture heads arranged around the outer circumference of the screw can ensure that no matter which side of the limiting bolt faces the connecting port, the deformation membrane can abut against at least one puncture head and be punctured.

[0015] Furthermore, waterproof strips are provided between the frame and the bottom cover and between the frame and the top cover, the waterproof strips are provided with through holes suitable for the limiting bolts to pass through, and a sealing ring is provided between the limiting bolts and the top connecting holes.

[0016] By adopting the above technical solution, the waterproof strip can fill the gap between the frame and the top cover and the bottom cover, so that external water or dust is not easy to enter the accommodating cavity through these gaps, thereby improving the waterproof and dustproof properties of a battery box with explosion-proof performance; the sealing ring can abut against the edge of the top connecting hole, so that external water is not easy to flow into the hollow inner cavity along the gap between the limiting screw and the top connecting hole, thereby improving the waterproof performance of a battery box with explosion-proof performance.

[0017] Furthermore, the deformable membrane is a waterproof membrane.

[0018] By adopting the above technical solution, when water enters the hollow inner cavity, the waterproof membrane can block the water, so that it is not easy for external water to enter the containing cavity from the connecting port, thereby further improving the waterproof performance of a battery box with explosion-proof performance.

[0019] Furthermore, the pressure relief port is opened on the bottom wall of the hollow inner cavity, a through hole connected to the pressure relief port is formed on the bottom cover, and the thickness of the bottom wall of the hollow inner cavity gradually decreases in the direction away from the pressure relief port to close to the pressure relief port.

[0020] By adopting the above technical solution, water entering the hollow inner cavity will be discharged to the outside from the pressure relief port under the influence of gravity, making it more difficult for water from the outside to enter the containing cavity, thereby further improving the waterproof performance of a battery box with explosion-proof performance.

[0021] Furthermore, a water guiding surface is formed on the inner wall of the communication port, and the water guiding surface is inclined downward in a direction from approaching the accommodating cavity to away from the accommodating cavity.

[0022] By adopting the above technical solution, after water enters the connecting port, it will first slide along the water guide surface into the hollow inner cavity under the influence of gravity, and then be discharged to the outside from the pressure relief port, so that it is more difficult for the outside water to enter the containing cavity, thereby further improving the waterproof performance of a battery box with explosion-proof performance.

[0023] Specifically, a connecting ear is provided on the outer side wall of the frame.

[0024] By adopting the above technical solution, a battery box with explosion-proof performance can be connected to a vehicle body through connecting ears.

[0025] In summary, this application includes the following beneficial technical effects:

[0026] A top cover, a bottom cover, a frame and an explosion-proof component are provided, the top cover and the bottom cover can be respectively buckled on both sides of the frame to form a accommodating cavity between the top cover and the bottom cover, the frame includes a frame and a plurality of beams connected to the frame, the plurality of beams are arranged at intervals and divide the accommodating cavity into a plurality of battery accommodating chambers suitable for accommodating batteries; a plurality of hollow cavities are formed inside the frame, and a pressure relief port leading to the outside and a connecting port connected to the battery accommodating chamber are provided on the inner wall of each hollow cavity, the explosion-proof component includes a piercing member and a deformable membrane, the piercing member is provided in the hollow cavity, the deformable membrane is provided at the connecting port and is suitable for blocking the connecting port, and the deformable membrane is configured to expand from the connecting port into the hollow cavity and abut against the piercing member when the air pressure reaches a preset pressure value, so as to pierce the deformable membrane through the piercing member, the design of the above-mentioned explosion-proof component enables the explosion-proof component to occupy only a very small part of the space in the accommodating cavity, thereby improving the space utilization rate in the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a three-dimensional diagram of a battery box with explosion-proof performance of the present application;

[0028] Figure 2 is a top view of a battery box with explosion-proof performance of the present application, wherein the top cover is deleted to facilitate the illustration of the crossbeam;

[0029] Figure 3 is along Figure 2 A schematic cross-sectional view taken along the AA direction, showing only the explosion-proof components and the hollow inner cavity located on one side of the frame.

[0030] Figure numerals: 1. top cover; 2. bottom cover; 3. frame; 31. frame; 311. hollow inner cavity; 312. pressure relief port; 313. connecting port; 32. crossbeam; 4. explosion-proof component; 41. piercing member; 411. piercing head; 42. deformation membrane; 43. pressure plate; 431. yield port; 432. fixing bolt; 5. battery housing chamber; 6. sealing ring; 7. connecting ear. DETAILED DESCRIPTION

[0031] Figure 1 This is a three-dimensional diagram of a battery box with explosion-proof performance in the present application. Figure 2 is a top view of a battery box with explosion-proof performance in the present application, in which the top cover is deleted to facilitate the display of the crossbeam. Figure 1 and Figure 2 The present application provides a battery box with explosion-proof performance, comprising: a top cover 1, a bottom cover 2, a frame 3 and an explosion-proof component 4. The top cover 1 and the bottom cover 2 can be respectively buckled on both sides of the frame 3 to form a receiving cavity between the top cover 1 and the bottom cover 2. The frame 3 includes a frame 31 and two cross beams 32 connected to the frame 31. The two cross beams 32 are arranged at intervals and divide the receiving cavity into three battery receiving chambers 5 suitable for receiving batteries. A plurality of connecting ears 7 are also provided on the outer side wall of the frame 31, so that the battery box with explosion-proof performance can be connected to the vehicle body through these connecting ears 7.

[0032] Figure 3 is along Figure 2 A schematic cross-sectional view taken along the AA direction, showing only the explosion-proof components and the hollow inner cavity on one side of the frame. Figure 2 and Figure 3 A plurality of hollow cavities 311 are formed inside the frame 31, and a pressure relief port 312 leading to the outside and a connecting port 313 connected to the battery storage chamber 5 are provided on the inner wall of each hollow cavity 311. The explosion-proof component 4 includes a piercing member 41 and a deformable membrane 42. The piercing member 41 is arranged in the hollow cavity 311, and the deformable membrane 42 is arranged at the connecting port 313 and is suitable for blocking the connecting port 313. The deformable membrane 42 can be a waterproof membrane, so that the storage chamber is relatively isolated from the external environment, and it is not easy for water or dust from the outside to enter the storage chamber from the connecting port 313, so as to have the effects of waterproof and dustproof.

[0033] Through the above design, when the air pressure in the accommodating chamber increases rapidly, the deformable film 42 will be compressed and expand from the connecting port 313 to the hollow inner cavity 311, and after the air pressure in the accommodating chamber increases to a predetermined pressure value, the deformable film 42 will abut against the piercing member 41 and be pierced by the piercing member 41, so that the deformable film 42 no longer blocks the connecting port 313, so that the gas in the accommodating chamber can enter the outside from the pressure relief port 312 of the hollow inner cavity 311, achieving the effect of rapid pressure reduction and explosion prevention. It is understandable that the deformation amount of the deformable film 42 when subjected to the same pressure can be artificially controlled by designing the material, thickness and other factors of the deformable film 42, so as to achieve the effect that when the deformable film 42 is subjected to the air pressure of the predetermined pressure value, it will abut against the piercing member 41 and be pierced by the piercing member 41. The predetermined pressure value can be set to half of the bursting pressure of a battery box with explosion-proof performance.

[0034] In addition, the multiple hollow cavities 311 dispersedly arranged in the frame 31 can ensure that no matter which battery storage chamber 5 has thermal runaway, the smoke in the battery storage chamber 5 can abut against the adjacent deformable membrane 42 and enter the outside after the deformable membrane 42 is punctured, thereby avoiding the secondary thermal runaway caused by the smoke generated in a battery storage chamber 5 spreading to other battery storage chambers 5; the design of the above-mentioned explosion-proof component 4 makes the explosion-proof component 4 only need to occupy a very small part of the space in the storage cavity, thereby improving the space utilization rate in the battery pack.

[0035] See also Figure 2 and Figure 3 The explosion-proof assembly 4 also includes a pressure plate 43, and a threaded hole is also provided on the inner side wall of the frame 31. The pressure plate 43 can be screwed with the frame 31 and the deformation membrane 42 is clamped between the pressure plate 43 and the frame 31. A clearance port 431 matching the connecting port 313 is also formed on the pressure plate 43, so that the gas in the accommodating chamber can directly contact the deformation membrane 42 through the clearance port 431, so that when the gas pressure in the accommodating chamber rises to a predetermined pressure value, the deformation membrane 42 will be pressurized and collided and punctured by the piercing member 41. Preferably, a through hole (not shown in the figure) matching the threaded hole can also be provided on the deformation membrane 42, so that the fixing bolt 432 used for screwing the pressure plate 43 and the frame 31 can pass through the through hole, so that the deformation membrane 42 can be better clamped between the pressure plate 43 and the frame 31.

[0036] See also Figure 2 and Figure 3In one embodiment, an upper connecting hole is formed on the top wall of the hollow inner cavity 311, a top connecting hole corresponding to the upper connecting hole is formed on the top cover 1, a lower connecting hole is formed on the bottom wall of the hollow inner cavity 311, and a bottom connecting hole corresponding to the lower connecting hole is formed on the bottom cover 2; the piercing member 41 is a limiting bolt, and a plurality of piercing heads 411 are formed in the middle part of the limiting bolt along the outer circumference of the screw rod. The limiting bolt can sequentially pass through the top connecting hole, the upper connecting hole, the lower connecting hole and the bottom connecting hole to be screwed with the nut, and the piercing head 411 is located in the hollow inner cavity 311 and matches the position of the connecting port 313.

[0037] Through the above design, the top cover 1 and the bottom cover 2 can be respectively fixed on the two sides of the frame 31 through the cooperation of the limiting bolts and the nuts; after the limiting bolts are installed in place, the puncture heads 411 are just located at a position in the hollow inner cavity 311 that matches the connecting port 313, thereby ensuring that the deformation membrane 42 will abut against the puncture heads 411 and be punctured by the puncture heads 411 after expansion; the multiple puncture heads 411 arranged around the outer circumference of the screw can ensure that no matter which side of the limiting bolt faces the connecting port 313, the deformation membrane 42 can abut against at least one puncture head 411 and be punctured.

[0038] See also Figure 2 and Figure 3 A waterproof strip (not shown in the figure) is provided between the frame 31 and the bottom cover 2 and between the frame 31 and the top cover 1. A through hole suitable for the limiting bolt to pass through is formed on the waterproof strip. The waterproof strip can fill the gap between the frame 31 and the top cover 1 and the bottom cover 2, so that it is not easy for external water or dust to enter the accommodating cavity from these gaps, thereby improving the waterproof and dustproof properties of a battery box with explosion-proof performance; a sealing ring 6 is provided between the limiting bolt and the top connecting hole, and the sealing ring 6 can abut against the edge of the top connecting hole, so that it is not easy for external water to flow into the hollow inner cavity 311 along the gap between the limiting screw and the top connecting hole, thereby improving the waterproof performance of a battery box with explosion-proof performance.

[0039] See also Figure 2 and Figure 3In one embodiment, the pressure relief port 312 is provided on the bottom wall of the hollow inner cavity 311, a through hole connected to the pressure relief port 312 is formed on the bottom cover 2, and the thickness of the bottom wall of the hollow inner cavity 311 gradually decreases in a direction away from the pressure relief port 312 to a direction close to the pressure relief port 312, so that water entering the hollow inner cavity 311 will be discharged from the pressure relief port 312 to the outside under the influence of gravity; a water guiding surface is also formed on the inner wall of the connecting port 313, and the water guiding surface is inclined downward in a direction close to the accommodating cavity to a direction away from the accommodating cavity, so that after entering the connecting port 313, the water will first slide into the hollow inner cavity 311 along the water guiding surface under the influence of gravity, and then be discharged to the outside from the pressure relief port 312, so that the water outside is more difficult to enter the accommodating cavity, thereby further improving the waterproof performance of a battery box with explosion-proof performance.

[0040] The working principle of a battery box with explosion-proof performance in the present application when in use is as follows:

[0041] A top cover 1, a bottom cover 2, a frame 3 and an explosion-proof component 4 are provided. The top cover 1 and the bottom cover 2 can be respectively buckled on both sides of the frame 3 to form a receiving cavity between the top cover 1 and the bottom cover 2. The frame 3 includes a frame 31 and a plurality of cross beams 32 connected to the frame 31. The plurality of cross beams 32 are arranged at intervals and divide the receiving cavity into a plurality of battery receiving chambers 5 suitable for receiving batteries. A plurality of hollow inner chambers 311 are formed inside the frame 31. A pressure relief port 312 leading to the outside and a connecting port 313 connected to the battery receiving chamber 5 are provided on the inner wall of each hollow inner chamber 311. The explosion-proof component 4 includes a piercing piece 41 and a deformable membrane 42. The piercing piece 41 is arranged in the hollow inner cavity 311, and the deformable membrane 42 is arranged at the connecting port 313 and is suitable for blocking the connecting port 313. The deformable membrane 42 is configured to expand from the connecting port 313 to the hollow inner cavity 311 and abut against the piercing piece 41 when the air pressure reaches a preset pressure value, so as to pierce the deformable membrane 42 through the piercing piece 41. The design of the above-mentioned explosion-proof component 4 makes it only need to occupy a very small part of the space in the accommodating cavity, thereby improving the space utilization rate in the battery pack.

[0042] It should be noted that the above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A battery box with explosion-proof performance, characterized in that: include: A top cover (1), a bottom cover (2), a frame (3) and an explosion-proof component (4), wherein the top cover (1) and the bottom cover (2) can be respectively buckled on two sides of the frame (3) to form a receiving cavity between the top cover (1) and the bottom cover (2), wherein the frame (3) comprises a frame (31) and a plurality of cross beams (32) connected to the frame (31), wherein the plurality of cross beams (32) are arranged at intervals and divide the receiving cavity into a plurality of battery receiving chambers (5) suitable for receiving batteries; A plurality of hollow inner cavities (311) are formed inside the frame (31), and a pressure relief port (312) leading to the outside and a communication port (313) communicating with the battery storage chamber (5) are provided on the inner wall of each hollow inner cavity (311). The explosion-proof component (4) comprises a piercing member (41) and a deformable membrane (42), wherein the piercing member (41) is arranged in the hollow inner cavity (311), and the deformable membrane (42) is arranged at the communication port (313) and is suitable for blocking the communication port (313), and the deformable membrane (42) is configured to expand from the communication port (313) into the hollow inner cavity (311) and abut against the piercing member (41) when the air pressure received reaches a preset pressure value, so as to pierce the deformable membrane (42) via the piercing member (41).

2. The battery box with explosion-proof performance according to claim 1, characterized in that: The explosion-proof component (4) further comprises a pressing plate (43), on which a clearance opening (431) matching the communication opening (313) is formed, and a threaded hole is also formed on the inner side wall of the frame (31), so that the pressing plate (43) can be screwed to the frame (31) and clamp the deformable membrane (42) between the pressing plate (43) and the frame (31).

3. The battery box with explosion-proof performance according to claim 2, characterized in that: An upper connection hole is formed on the top wall of the hollow inner cavity (311), a top connection hole corresponding to the upper connection hole is formed on the top cover (1), a lower connection hole is formed on the bottom wall of the hollow inner cavity (311), and a bottom connection hole corresponding to the lower connection hole is formed on the bottom cover (2); The piercing member (41) is a limiting bolt, and a plurality of piercing heads (411) are formed in the middle portion of the limiting bolt along the outer circumference of the screw rod. The limiting bolt can sequentially pass through the top connecting hole, the upper connecting hole, the lower connecting hole and the bottom connecting hole to be screwed to the nut, and the piercing head (411) is located in the hollow inner cavity (311) and matches the position of the connecting port (313).

4. The battery box with explosion-proof performance according to claim 3, characterized in that: A waterproof strip is provided between the frame (31) and the bottom cover (2) and between the frame (31) and the top cover (1). A through hole suitable for the limiting bolt to pass through is formed on the waterproof strip. A sealing ring (6) is provided between the limiting bolt and the top connection hole.

5. The battery box with explosion-proof performance according to claim 3, characterized in that: The deformable membrane (42) is a waterproof membrane.

6. The battery box with explosion-proof performance according to claim 5, characterized in that: The pressure relief port (312) is formed on the bottom wall of the hollow inner cavity (311); a through hole communicating with the pressure relief port (312) is formed on the bottom cover (2); and the thickness of the bottom wall of the hollow inner cavity (311) gradually decreases in a direction away from the pressure relief port (312) to closer to the pressure relief port (312).

7. The battery box with explosion-proof performance according to claim 6, characterized in that: A water guide surface is formed on the inner wall of the communication opening (313), and the water guide surface is inclined downward in a direction from close to the accommodating cavity to away from the accommodating cavity.

8. The battery box with explosion-proof performance according to claim 1, characterized in that: A connecting ear (7) is provided on the outer side wall of the frame (31).

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