Battery pack

Abstract

The utility model relates to a battery pack which comprises a battery cell, one side, provided with a pole, of the battery cell is a top side, and the other side, opposite to the top side, of the battery cell is a bottom side; a cavity for placing the battery cell is defined in the box body, the box body comprises a liquid cooling bottom plate located at the bottom side of the battery cell, a liquid cooling channel and a fire-fighting gas channel are integrated in the liquid cooling bottom plate, and the fire-fighting gas channel is used for introducing fire-fighting gas; a fire-fighting gas nozzle is arranged in the liquid cooling bottom plate; an inlet of the fire-fighting gas nozzle is communicated with the fire-fighting gas channel; and an outlet of the fire-fighting gas nozzle is communicated with the cavity. According to the battery pack, fire fighting in the pack can be achieved, and fire fighting and extinguishment are rapid; meanwhile, the battery pack is directly expanded on the liquid cooling bottom plate, the fire-fighting gas channel is integrated into the liquid cooling bottom plate, and the liquid cooling channel and the fire-fighting gas channel are mutually independent and do not influence each other, so that enough battery cell assembly space can be ensured, the battery capacity of the battery pack is ensured, and the original liquid cooling function is not influenced.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery pack. Background Art

[0002] The current fire safety precautions for battery packs are usually: mostly using insulation, flame retardant materials, and explosion-proof valves to achieve fire protection for battery packs. However, with this fire protection method, insulation materials and flame retardant materials can only reduce the probability of fire and explosion, but cannot avoid fire and explosion, and once a fire occurs in the battery pack, it cannot be extinguished in the first time. Therefore, some existing battery packs, such as the patent with authorization announcement number CN 220306418 U, disclose a battery pack with fire protection function, which controls the danger in the battery pack by setting a fire protection tank in the battery pack. However, if extra space is left in the battery pack to assemble the fire protection tank, under the premise that the volume of the battery pack remains unchanged, it will undoubtedly compress the assembly space of the battery cells, thereby reducing the battery capacity of the battery pack, and there is room for improvement. Utility Model Content

[0003] In order to overcome at least one of the defects of the prior art described above, according to one aspect of the utility model, a battery pack is provided, which can achieve fire protection inside the pack and quickly extinguish fires without compressing the assembly space of the battery cells.

[0004] A battery pack, comprising:

[0005] A battery cell, wherein a side of the battery cell having a pole is a top side, and a side opposite to the top side is a bottom side;

[0006] A box body is formed inside the box body with a cavity for placing the battery cell, the box body includes a liquid cooling base plate located at the bottom side of the battery cell, the liquid cooling base plate is integrated with a liquid cooling channel and a fire gas channel, the fire gas channel is used to pass fire gas, and a fire gas jet port is provided in the liquid cooling base plate, the inlet of the fire gas jet port is connected to the fire gas channel, and the outlet of the fire gas jet port is connected to the cavity.

[0007] In an embodiment of the present invention, the fire gas channel is arranged on a side of the liquid cooling base plate close to the battery core, and the liquid cooling channel is arranged on a side of the liquid cooling base plate away from the battery core.

[0008] In one embodiment of the utility model, a gas detector is further included which is arranged on the box body, and the gas detector is used to monitor the concentration of combustible gas in the box body.

[0009] In one embodiment of the utility model, it also includes an explosion-proof valve arranged on the box body, and the explosion-proof valve and the gas detector are arranged on two opposite side walls of the box body.

[0010] In one embodiment of the utility model, the liquid cooling base plate is provided with a fire gas inlet for introducing fire gas, the fire gas channel includes a first gas channel section and a second gas channel section, the first gas channel section itself is connected end to end in a ring-shaped arrangement, and the second gas channel section is connected to the first gas channel section and the fire gas inlet;

[0011] A plurality of fire-fighting gas jet ports are provided, and the plurality of fire-fighting gas jet ports are arranged at intervals relative to the positions where the first gas channel section and the second gas channel section are located.

[0012] In an embodiment of the present invention, the diameter dimension d2 of the fire-fighting gas inlet is in the range of 6 mm ≤ d2 ≤ 8 mm.

[0013] In one embodiment of the utility model, a coolant outlet and a coolant inlet are provided on the liquid cooling base plate, one end of the liquid cooling channel is connected to the coolant inlet and the other end is connected to the coolant outlet; the fire gas inlet is provided between the coolant outlet and the coolant inlet.

[0014] In an embodiment of the present invention, the diameter dimension d3 of the coolant inlet is in the range of 6 mm ≤ d2 ≤ 8 mm; the diameter dimension d4 of the coolant outlet is in the range of 6 mm ≤ d2 ≤ 8 mm.

[0015] In an embodiment of the present invention, the diameter dimension d1 of the outlet of the fire-fighting gas jet port is in the range of: 0.8 mm ≤ d1 ≤ 1.2 mm.

[0016] In an embodiment of the present invention, the width L1 of the fire-fighting gas passage itself is in the range of: 3mm≤L1≤7mm.

[0017] In summary, the battery pack provided by the utility model has the following technical effects:

[0018] The battery pack can achieve internal fire protection and rapid fire extinguishing. At the same time, the battery pack is directly expanded on the liquid cooling base plate, and the fire fighting gas channel is integrated into the liquid cooling base plate. The liquid cooling channel and the fire fighting gas channel are independent of each other and do not affect each other, which can ensure that there is sufficient space for battery cell assembly and the battery capacity of the battery pack, and at the same time will not affect the original liquid cooling function. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the structure of a battery pack according to an embodiment of the utility model;

[0020] Figure 2 A cross-sectional view of the internal structure of a battery pack according to an embodiment of the utility model;

[0021] Figure 3 This is a schematic diagram of the structure of a liquid cooling base plate in a battery pack according to an embodiment of the utility model;

[0022] Figure 4 A cross-sectional view of a fire-fighting gas passage of a liquid-cooled bottom plate in a battery pack according to an embodiment of the utility model;

[0023] Figure 5 It is a structural schematic diagram of the liquid cooling channel of the liquid cooling bottom plate in the battery pack of an embodiment of the utility model;

[0024] Figure: 1-battery cell, 2-box, 21-cavity, 22-liquid cooling base plate, 23-gas detector, 24-explosion-proof valve, 3-liquid cooling channel, 31-cooling liquid outlet, 32-cooling liquid inlet, 4-fire gas channel, 41-first gas channel section, 42-second gas channel section, 43-fire gas inlet, 5-fire gas jet outlet. DETAILED DESCRIPTION

[0025] For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0026] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and 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 direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0028] The embodiment of the utility model discloses a battery pack, such as Figure 1-Figure 5As shown, the battery includes a battery cell 1, and the side of the battery cell 1 with the pole is the top side, and the side opposite to the top side is the bottom side; the battery pack also includes a box body 2, and a cavity 21 for placing the battery cell 1 is formed in the box body 2, and the box body 2 includes a liquid cooling bottom plate 22 located at the bottom side of the battery cell 1, and the liquid cooling bottom plate 22 is integrated with a liquid cooling channel 3 and a fire gas channel 4, and the fire gas channel 4 is used to pass fire gas, and a fire gas jet port 5 is provided in the liquid cooling bottom plate 22, and the inlet of the fire gas jet port 5 is connected to the fire gas channel 4, and the outlet of the fire gas jet port 5 is connected to the cavity 21.

[0029] During specific use, once the battery cell 1 in the battery pack catches fire, the firefighting gas introduced into the firefighting gas channel 4 can be sprayed into the cavity 21 through the firefighting gas jet port 5 to extinguish the fire of the battery pack; and after the fire is extinguished, the battery pack will be filled with firefighting gas to effectively prevent re-ignition. Therefore, this battery pack can achieve firefighting inside the pack and quickly extinguish the fire; at the same time, this battery pack is directly expanded on the liquid cooling base plate 22, and the firefighting gas channel 4 is integrated into the liquid cooling base plate 22, and the liquid cooling channel 3 and the firefighting gas channel 4 are independent of each other and do not affect each other, that is, it can ensure that there is enough space for the battery cell 1 to assemble and ensure the battery capacity of the battery pack, and at the same time it will not affect the original liquid cooling function.

[0030] It should be noted that the firefighting gas stored in the gas cylinder can be passed to the firefighting gas passage 4 through a pipeline by a driving device, such as an air pump, which is not limited here.

[0031] Optionally, the fire gas channel 4 is arranged on the side of the liquid cooling base plate 22 close to the battery cell 1, and the liquid cooling channel 3 is arranged on the side of the liquid cooling base plate 22 away from the battery cell 1. In specific use, the position where the fire gas channel 4 is arranged will be closer to the battery cell 1, so the fire gas can reach the ignited battery cell 1 in the cavity 21 more quickly to achieve faster fire fighting; at the same time, in terms of structural design, the position where the fire gas jet port 5 is arranged will also be closer to the battery cell 1, and the fire gas jet port 5 does not need to avoid the liquid cooling channel 3, so the structure will be simpler, easy to manufacture, and reduce the manufacturing difficulty.

[0032] Optionally, in the liquid cooling base plate 22 , the fire gas channel 4 may be specifically arranged above the liquid cooling channel 3 .

[0033] Optionally, the battery pack further includes a gas detector 23 disposed on the box body 2, and the gas detector 23 is used to monitor the concentration of combustible gas in the box body 2. In specific use, the gas detector 23 can monitor the concentration of combustible gas in the battery pack at all times, and a combustible gas concentration limit can be specifically set. Once the gas detector 23 detects that the concentration of combustible gas reaches the preset limit, the external air pump can be controlled to pass fire gas into the fire gas channel 4 in the liquid cooling base plate 22 in the battery pack for fire extinguishing.

[0034] Optionally, the gas detector 23 may be specifically arranged on the side wall of the box body 2 so as to better monitor the concentration of the combustible gas in the box body 2 .

[0035] Optionally, the firefighting gas may be specifically heptafluoropropane gas. In terms of fire extinguishing, the advantages of heptafluoropropane gas are its good fire extinguishing effect and low toxicity. Due to its good permeability and surface activity, it can quickly penetrate into the surface of the burning object, inhibit combustion and prevent re-ignition. In addition, the advantages of heptafluoropropane fire extinguishing gas are its high efficiency, rapidity, no pollution and no corrosion. Compared with the traditional gas fire extinguishing system, heptafluoropropane fire extinguishing gas has a higher fire extinguishing efficiency and can put out the fire in a shorter time. Of course, the firefighting gas can also be carbon dioxide gas, nitrogen, argon gas, etc.

[0036] Optionally, the battery pack further includes an explosion-proof valve 24 disposed on the box body 2. In specific use, a pressure limit for opening the explosion-proof valve 24 can be specifically set, but when thermal runaway occurs in the battery pack, the air pressure in the battery pack reaches the limit of the explosion-proof valve 24, and the explosion-proof valve 24 automatically opens to release pressure, thereby reducing the pressure inside the battery pack and avoiding the occurrence of explosion accidents.

[0037] Optionally, the explosion-proof valve 24 and the gas detector 23 are arranged one by one on the opposite side walls of the box body 2. In this way, the explosion-proof valve 24 and the gas detector 23 will not interfere with each other, ensuring that the two can work normally better.

[0038] Optionally, a fire gas inlet 43 for introducing fire gas is provided on the liquid cooling base plate 22, and the fire gas inlet 43 is connected to the fire gas channel 4. With such a configuration, when in use, the gas detector 23 can monitor the concentration of combustible gas in the battery pack at all times, and a combustible gas concentration limit can be specifically set. Once the gas detector 23 detects that the concentration of combustible gas reaches the preset limit, the external air pump can be controlled to introduce fire gas into the fire gas inlet 43 on the liquid cooling base plate 22 in the battery pack, and the fire gas will flow to the fire gas channel 4, and finally be ejected from the fire gas jet port 5 to extinguish the fire.

[0039] Optionally, the liquid cooling base plate 22 is provided with a fire gas inlet 43 for introducing fire gas, and the fire gas channel 4 includes a first gas channel section 41 and a second gas channel section 42, the first gas channel section 41 itself is connected end to end in a ring arrangement, and the second gas channel section 42 is connected to the first gas channel section 41 and the fire gas inlet 43; there are multiple fire gas jet ports 5, and the multiple fire gas jet ports 5 are arranged at intervals relative to the positions of the first gas channel section 41 and the second gas channel section 42. When used specifically, the fire gas channel 4 arranged in a ring can relatively comprehensively cover the battery cells 1 located in the box body 2, and no matter which battery cell 1 has thermal runaway, the fire gas can be ejected from the corresponding fire gas jet port 5 to achieve fixed-point rapid fire fighting. At the same time, using heptafluoropropane gas (or other equivalent fire gas) through the liquid cooling base plate 22, ejected from multiple fire gas jet ports 5, can completely cover each battery cell 1, and achieve efficient fire fighting.

[0040] Optionally, the shape of the first gas channel segment 41 may be square or circular, wherein a square first gas channel segment 41 is most suitable, such as a square or rectangular shape.

[0041] Optionally, the second gas channel section 42 may be specifically disposed in the middle of the square first gas channel section 41 .

[0042] Optionally, the diameter dimension d1 of the outlet of the fire gas jet port 5 is in the range of 0.8 mm ≤ d ≤ 1.2 mm. This can ensure that the fire gas is sprayed at an appropriate distance and can be sprayed to the battery cell 1, while also not reducing the structural strength of the liquid cooling base plate 22. In some embodiments, the diameter dimension d1 of the outlet of the fire gas jet port 5 may be 0.8 mm, 0.9 mm, 1.0 mm, 1.1 mm or 1.2 mm. Of course, in some other embodiments, the diameter dimension d1 of the outlet of the fire gas jet port 5 may also be other dimensions within the range of 0.8 mm ≤ d ≤ 1.2 mm.

[0043] Optionally, the diameter size d1 of the outlet of the fire-fighting gas jet port 5 is most appropriately 1 mm.

[0044] Optionally, the diameter dimension d2 of the fire gas inlet 43 is in the range of 6 mm ≤ d2 ≤ 10 mm. This can ensure that the fire gas has a sufficient amount of flow, and at the same time will not reduce the structural strength of the liquid cooling base plate 22. In some embodiments, the diameter dimension d2 of the fire gas inlet 43 can be 6 mm, 7 mm, 8 mm, 9 mm or 10 mm. Of course, in some other embodiments, the diameter dimension d2 of the fire gas inlet 43 can also be other dimensions within the range of 6 mm ≤ d2 ≤ 10 mm.

[0045] Optionally, the diameter size d2 of the fire gas inlet 43 is most suitable to be 8 mm.

[0046] Optionally, a coolant outlet 31 and a coolant inlet 32 ​​are provided on the liquid cooling base plate 22, one end of the liquid cooling channel 3 is connected to the coolant inlet 32 ​​and the other end is connected to the coolant outlet 31; the fire gas inlet 43 is provided between the coolant outlet 31 and the coolant inlet 32. In specific use, the coolant outlet 31 and the coolant inlet 32 ​​are usually connected to an external liquid cooling pipeline, and the fire gas inlet 43 is also connected to an external fire gas pipeline. Such separate settings can avoid interference between the external liquid cooling pipeline and the fire gas pipeline, and ensure that both liquid cooling and fire fighting functions can be well realized.

[0047] Optionally, the diameter dimension d3 of the coolant inlet 32 ​​is in the range of 6 mm ≤ d2 ≤ 8 mm. This ensures that the coolant has a sufficient inflow to have a sufficient cooling effect, while also not reducing the structural strength of the liquid cooling base plate 22. In some embodiments, the diameter dimension d3 of the coolant inlet 32 ​​may be 6 mm, 7 mm, 8 mm, 9 mm, or 10 mm. Of course, in some other embodiments, the diameter dimension d3 of the coolant inlet 32 ​​may also be other dimensions within the range of 6 mm ≤ d2 ≤ 10 mm.

[0048] Optionally, the diameter dimension d3 of the coolant inlet 32 ​​is most appropriately 8 mm.

[0049] Optionally, the diameter dimension d4 of the coolant outlet 31 is in the range of 6mm≤d2≤8mm. This ensures that the coolant has a sufficient outflow to have a sufficient cooling effect, while also not reducing the structural strength of the liquid cooling base plate 22. In some embodiments, the diameter dimension d4 of the coolant outlet 31 may be 6mm, 7mm, 8mm, 9mm or 10mm. Of course, in some other embodiments, the diameter dimension d4 of the coolant outlet 31 may also be other dimensions within the range of 6mm≤d2≤10mm.

[0050] Optionally, the diameter dimension d4 of the coolant outlet 31 is most appropriately 8 mm.

[0051] Optionally, the width L1 of the fire gas passage 4 itself is in the range of 3mm≤L1≤7mm. This can ensure sufficient fire gas circulation while not reducing the structural strength of the liquid cooling base plate 22. In some embodiments, the width L1 of the fire gas passage 4 itself can be 3mm, 4mm, 5mm, 6mm or 7mm. Of course, in some other embodiments, the width L1 of the fire gas passage 4 itself can also be other sizes within the range of 3mm≤L1≤7mm.

[0052] Optionally, the width L1 of the fire gas passage 4 itself is most suitable to be 5 mm.

[0053] The technical means disclosed in the solution of the utility model are not limited to the technical means disclosed in the above-mentioned implementation mode, but also include technical solutions composed of any combination of the above technical features. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the utility model, and these improvements and modifications are also regarded as the protection scope of the utility model.

Claims

1. A battery pack, characterized in that: include: A battery cell (1), wherein a side of the battery cell (1) having a pole is a top side, and a side opposite to the top side is a bottom side; A box (2), wherein a cavity (21) is formed in the box (2) for placing the battery cell (1), and the box (2) includes a liquid cooling base plate (22) located at the bottom side of the battery cell (1), wherein a liquid cooling channel (3) and a fire gas channel (4) are integrated in the liquid cooling base plate (22), wherein the fire gas channel (4) is used to introduce fire gas, and a fire gas jet port (5) is provided in the liquid cooling base plate (22), wherein the inlet of the fire gas jet port (5) is connected to the fire gas channel (4), and the outlet of the fire gas jet port (5) is connected to the cavity (21).

2. A battery pack according to claim 1, characterized in that: The fire-fighting gas channel (4) is arranged on a side of the liquid-cooling base plate (22) close to the battery core (1), and the liquid-cooling channel (3) is arranged on a side of the liquid-cooling base plate (22) away from the battery core (1).

3. A battery pack according to claim 1, characterized in that: It also comprises a gas detector (23) arranged on the box body (2), wherein the gas detector (23) is used to monitor the concentration of combustible gas in the box body (2).

4. A battery pack according to claim 3, characterized in that: It also includes an explosion-proof valve (24) arranged on the box body (2), and the explosion-proof valve (24) and the gas detector (23) are arranged one by one on two opposite side walls of the box body (2).

5. A battery pack according to any one of claims 1 to 4, characterized in that: The liquid cooling base plate (22) is provided with a fire-fighting gas inlet (43) for introducing fire-fighting gas, the fire-fighting gas channel (4) comprises a first gas channel section (41) and a second gas channel section (42), the first gas channel section (41) itself is connected end to end in a ring-shaped arrangement, and the second gas channel section (42) is in communication with the first gas channel section (41) and the fire-fighting gas inlet (43); A plurality of fire-fighting gas jet ports (5) are provided, and the plurality of fire-fighting gas jet ports (5) are arranged at intervals relative to the positions where the first gas channel section (41) and the second gas channel section (42) are located.

6. A battery pack according to claim 5, characterized in that: The diameter dimension d2 of the fire-fighting gas inlet (43) is in the range of 6 mm ≤ d2 ≤ 8 mm.

7. A battery pack according to claim 6, characterized in that: The liquid cooling base plate (22) is provided with a cooling liquid outlet (31) and a cooling liquid inlet (32); one end of the liquid cooling channel (3) is connected to the cooling liquid inlet (32) and the other end is connected to the cooling liquid outlet (31); the fire fighting gas inlet (43) is provided between the cooling liquid outlet (31) and the cooling liquid inlet (32).

8. A battery pack according to claim 7, characterized in that: The range of the diameter dimension d3 of the cooling liquid inlet (32) is: 6mm≤d2≤8mm; the range of the diameter dimension d4 of the cooling liquid outlet (31) is: 6mm≤d2≤8mm.

9. A battery pack according to any one of claims 1-4, 6-8, characterized in that: The diameter dimension d1 of the outlet of the fire-fighting gas jet port (5) is in the range of 0.8 mm ≤ d1 ≤ 1.2 mm.

10. A battery pack according to any one of claims 1-4, 6-8, characterized in that: The width L1 of the fire-fighting gas passage (4) itself is in the range of 3 mm ≤ L1 ≤ 7 mm.

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