Battery fire extinguishing assembly and new energy automobile battery pack

Abstract

The utility model relates to the field of new energy batteries, in particular to a battery fire extinguishing assembly and a new energy automobile battery pack, which comprise a fire extinguishing medium pipe suspended above a battery, a fixed cylinder is arranged on the battery, a sliding disc in sliding fit with the cylinder wall is arranged in the fixed cylinder, and an ejector pin is arranged on the sliding disc. The movement path of the ejector pin in the vertical direction intersects with the fire extinguishing medium pipe so as to pierce the fire extinguishing medium pipe, and at the moment, the injection range of the fire extinguishing medium covers the battery; the sliding disc, the fixing cylinder and the battery define a sealing cavity. The battery fire extinguishing assembly further comprises a pressure source for pressurizing the sealing cavity. According to the utility model, point-to-point fire extinguishing can be carried out on the single batteries in the battery pack, and the fire extinguishing efficiency is high.

Description

Technical Field

[0001] The utility model relates to the field of new energy batteries, in particular to a battery fire extinguishing component and a new energy vehicle battery pack. Background Art

[0002] With the rapid development of electric vehicles and renewable energy, large-capacity lithium-ion batteries have been widely used as energy storage devices; battery packs are indispensable components in electric vehicles, portable electronic devices and other fields. Due to their internal chemical reactions and high energy density, batteries may fail during charging and discharging and under abnormal conditions such as overcharging, over-discharging, short circuit, etc. These failures can cause excessive heat to be generated inside the battery, posing a fire risk.

[0003] When the battery pack catches fire, the existing fire extinguishing scheme, as described in patent number "CN117018507A", uses monitoring cameras and cover plate outlet pipes to perform intelligent transmission and fire extinguishing during combustion. After the fire is extinguished, the remaining waste inhibitor liquid is recovered from the bottom of the gas sensor and the cavity through the outlet tank. This irregular fire extinguishing scheme can only spray inhibitors over a large area to block the spread of flames, and cannot accurately extinguish the fire point. The amount of inhibitor used in the fire extinguishing process is too large, and the fire extinguishing efficiency is low, so it needs to be solved urgently. Utility Model Content

[0004] In order to avoid and overcome the technical problems existing in the prior art, the utility model provides a battery fire extinguishing assembly and a new energy vehicle battery pack. The utility model can perform point-to-point fire extinguishing on battery cells in the battery pack, and has high fire extinguishing efficiency.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A battery fire extinguishing assembly comprises a fire extinguishing medium tube suspended above a battery, a fixed cylinder installed on the battery, a sliding disc slidably matched with the cylinder wall built into the fixed cylinder, an ejector pin arranged on the sliding disc, a movement path of the ejector pin in a vertical direction intersecting with the fire extinguishing medium tube so as to puncture the fire extinguishing medium tube, at which time the spray range of the fire extinguishing medium covers the battery; the sliding disc, the fixed cylinder and the battery enclose a sealed cavity, and the battery fire extinguishing assembly also comprises a pressure source for pressurizing the sealed cavity.

[0007] As a further solution of the utility model: the pressure source is a high-pressure air cavity built into the battery, the high-pressure air cavity is connected to the sealed cavity through a high-pressure air valve, and the high-pressure air valve is configured to open unidirectionally toward the sealed cavity when the battery exceeds a set temperature.

[0008] As a further solution of the utility model: an annular guide groove is axially provided in the wall of the fixed cylinder to limit the sliding range of the sliding plate, and when the high-pressure gas valve is not opened, the ejector pin is located in the cylinder cavity of the fixed cylinder.

[0009] As a further solution of the utility model: a spray port for spraying the fire extinguishing medium is provided at the bottom of the fire extinguishing medium pipe, and the spray port is coaxially arranged with the ejector pin.

[0010] As a further solution of the utility model: the mouth of the injection port is sealed by a sealing cover threaded fit, the cover surface of the sealing cover is a pierceable sealing membrane, and the sealing membrane is coaxially arranged with the ejector pin.

[0011] As a further solution of the utility model: the closing membrane is an elastic membrane, a rubber membrane or a polyurethane membrane.

[0012] A new energy vehicle battery pack includes a battery fire extinguishing assembly as described above, wherein the batteries are arranged in a rectangular array in the battery pack and sealed by a cover plate, and a fire extinguishing medium pipe is fixed under the cover plate.

[0013] As a further solution of the utility model: a card slot is opened on the cover plate surface for the fire extinguishing medium pipe to be clamped and fixed.

[0014] As a further solution of the utility model: the bottom of the fire extinguishing medium pipe is arranged with injection ports corresponding to the number of batteries, and the fire extinguishing medium pipe is arranged in an S shape to pass over each battery in sequence.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] 1. The utility model suspends a fire extinguishing medium tube storing a fire extinguishing medium above a battery. When a battery catches fire, the pressure source is used to pressurize the sealed cavity, thereby driving the sliding plate and the ejector pin on the sliding plate to slide upward, and the fire extinguishing medium tube can be pierced, so that the battery is extinguished point by point through the fire extinguishing medium, and the fire extinguishing efficiency is high.

[0017] 2. The utility model has a built-in high-pressure gas cavity in the battery, and is connected to the sealed cavity through a one-way high-pressure gas valve. After detecting that the battery temperature is too high, the high-pressure gas valve opens to form high pressure in the sealed cavity, causing the sliding plate and the ejector pin on the sliding plate to move upward, piercing the sealing membrane of the fire extinguishing medium tube, thereby releasing the fire extinguishing medium; when no fire occurs, the ejector pin is hidden in the fixed cylinder, away from the position of the fire extinguishing medium tube, to avoid accidentally piercing the fire extinguishing medium tube; the detachable arrangement of the sealing cover is convenient for secondary use after replacement.

[0018] 3. The utility model installs the fire extinguishing medium pipe along the S-shaped direction at the bottom of the cover plate of the battery pack, so that it can pass over each battery in turn and perform point-to-point fire extinguishing treatment on each battery through the injection port. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the battery fire extinguishing component of the utility model.

[0020] Figure 2 It is a structural schematic diagram of the battery pack of the utility model.

[0021] Figure 3 It is an enlarged structural diagram of the fire extinguishing medium pipe and the battery matching part in the utility model.

[0022] In the figure:

[0023] 1. Battery pack; 11. Cover plate;

[0024] 2. Fire extinguishing medium pipe; 21. Injection port; 22. Sealing cover; 23. Sealing membrane;

[0025] 3. battery; 31. fixing tube; 311. guide groove;

[0026] 32. High-pressure air valve; 33. Sliding plate; 331. Ejector pin. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] See also Figures 1 to 3 In an embodiment of the utility model, a battery fire extinguishing assembly and a new energy vehicle battery pack are provided, wherein batteries 3 are arranged in a rectangular array in the battery pack 1, and the fixing method of the batteries 3 is not limited. After the batteries 3 are installed, the battery pack 1 is sealed by covering the cover plate 11.

[0029] An S-shaped slot is provided on the cover plate 11, and the direction of the slot is consistent with the arrangement of the batteries 3. The fire extinguishing medium pipe 2 is inserted into the slot so that it can pass over each battery 3 in sequence. The fire extinguishing medium pipe 2 is filled with heptafluoropropane or perfluorohexanone. A plurality of groups of injection ports 21 are arranged at the bottom of the pipe body of the fire extinguishing medium pipe 2. The number and position of the injection ports 21 correspond to the batteries 3, and each injection port 21 is located directly above each battery 3.

[0030] The bottom of the injection port 21 is open, and the opening is connected with a sealing cover 22 by threaded fit or snap fit, and the cover surface of the sealing cover 22 is a sealing film 23, which is a flexible material that can be punctured and has a certain toughness, preferably silicone, rubber or polyurethane. When the sealing film 23 is damaged, the fire extinguishing medium in the fire extinguishing medium pipe 2 can be discharged outward through the sealing cover 22.

[0031] The battery 3 is provided with a fixed cylinder 31 coaxially arranged with the corresponding injection port 21, with openings at both ends of the fixed cylinder 31, and an annular guide groove 311 is provided axially on the cylinder body of the middle section of the inner wall of the fixed cylinder 31, and the sliding plate 33 is installed in the guide groove 311 and can slide along the guide groove 311. A ejector pin 331 is fixed on the sliding plate 33, and the ejector pin 331 can pierce the sealing film 23 after sliding upward with the sliding plate 33. When the fire extinguishing medium pipe 2 is installed, there is still a certain distance between the injection port 21 and the mouth of the fixed cylinder 31.

[0032] After the sliding plate 33 is installed, the sliding plate 33, the fixing tube 31 and the battery 3 together enclose a sealed cavity. By injecting liquid or gas into the sealed cavity, the sealed cavity can be pressurized to drive the sliding plate 33 to slide upward.

[0033] A high-pressure gas cavity may be built into the battery 3 at the adjacent fixed cylinder 31. The high-pressure gas cavity is pre-filled with high-pressure nitrogen or other inert gas. The high-pressure gas cavity may be connected to the sealed cavity through a high-pressure gas valve 32. A temperature sensor may be installed on the battery 3. When the temperature of the battery 3 exceeds the set temperature, the high-pressure gas valve 32 opens unidirectionally, so that the gas in the high-pressure gas cavity is injected into the sealed cavity along the high-pressure gas valve 32 to increase the pressure of the sealed cavity, thereby causing the sliding plate 33 to slide upward to drive the ejector pin 331 to pierce the closed film 23, and perform point-to-point fire extinguishing treatment on the battery.

[0034] The basic principles of the present application are described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, effects, etc. mentioned in the present application are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. are required by each embodiment of the present application. In addition, the specific details disclosed above are only for the purpose of illustration and ease of understanding, not for limitation, and the above details do not limit the present application to being implemented by adopting the above specific details.

[0035] The block diagrams of the devices, apparatuses, equipment, and systems involved in this application are only illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagram. As will be appreciated by those skilled in the art, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open words, referring to "including but not limited to", and can be used interchangeably with them. The words "or" and "and" used here refer to the words "and / or" and can be used interchangeably with them, unless the context clearly indicates otherwise. The words "such as" used here refer to the phrase "such as but not limited to", and can be used interchangeably with them.

Claims

1. A battery fire extinguishing assembly, characterized in that: The invention comprises a fire extinguishing medium tube (2) suspended above a battery (3), a fixed cylinder (31) being mounted on the battery (3), a sliding disc (33) being built into the fixed cylinder (31) and being slidably matched with the cylinder wall, a ejector pin (331) being arranged on the sliding disc (33), and a movement path of the ejector pin (331) in a vertical direction intersecting with the fire extinguishing medium tube (2) so as to be used for puncturing the fire extinguishing medium tube, and at this time, the spray range of the fire extinguishing medium covers the battery (3); the sliding disc (33), the fixed cylinder (31) and the battery (3) are enclosed to form a sealed cavity, and the battery fire extinguishing assembly further comprises a pressure source for pressurizing the sealed cavity.

2. A battery fire extinguishing assembly according to claim 1, characterized in that: The pressure source is a high-pressure air cavity built into the battery (3), the high-pressure air cavity is connected to the sealed cavity via a high-pressure air valve (32), and the high-pressure air valve (32) is configured to open unidirectionally toward the sealed cavity when the battery (3) exceeds a set temperature.

3. A battery fire extinguishing assembly according to claim 2, characterized in that: An annular guide groove (311) is axially provided in the wall of the fixed cylinder (31) to limit the sliding range of the sliding plate (33). When the high-pressure gas valve (32) is not opened, the ejector pin (331) is located in the cylinder cavity of the fixed cylinder (31).

4. A battery fire extinguishing assembly according to any one of claims 1 to 3, characterized in that: The bottom of the fire extinguishing medium pipe (2) is provided with a spray port (21) for spraying the fire extinguishing medium, and the spray port (21) is coaxially arranged with the ejector pin (331).

5. A battery fire extinguishing assembly according to claim 4, characterized in that: The mouth of the injection port (21) is sealed by threaded engagement with a sealing cover (22), the cover surface of the sealing cover (22) is a pierceable sealing film (23), and the sealing film (23) is coaxially arranged with the ejector pin (331).

6. A battery fire extinguishing assembly according to claim 5, characterized in that: The sealing film (23) is an elastic film, a rubber film or a polyurethane film.

7. A new energy vehicle battery pack, characterized in that: It comprises a battery fire extinguishing assembly as claimed in any one of claims 1 to 3, wherein the batteries (3) are arranged in a rectangular array in a battery pack (1) and are sealed by a cover plate (11), and the fire extinguishing medium pipe (2) is fixed under the cover plate (11).

8. A new energy vehicle battery pack according to claim 7, characterized in that: A clamping groove is provided on the surface of the cover plate (11) for clamping and fixing the fire extinguishing medium pipe (2).

9. A new energy vehicle battery pack according to claim 7, characterized in that: The bottom of the fire extinguishing medium pipe (2) is arranged with injection ports (21) corresponding to the number of batteries (3), and the fire extinguishing medium pipe (2) is arranged in an S shape so as to pass over each battery (3) in sequence.

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