High-safety lithium battery pack

Abstract

The utility model discloses a lithium battery pack with high safety, which relates to the technical field of lithium batteries and comprises a shell, a plugging cover and a lithium battery main body are respectively arranged at the top and inside the shell, an air inlet pipe and an exhaust pipe are fixedly inserted in the plugging cover, and two plugging pieces are arranged in the plugging cover in a sliding manner. The two plugging pieces are inserted into the air inlet pipe and the exhaust pipe in a sliding mode respectively, a driving assembly used for driving the two plugging pieces to plug the air inlet pipe and the exhaust pipe is arranged in the plugging cover, a smoke alarm is arranged in the shell, and the smoke alarm is electrically connected with the driving assembly. The driving assembly comprises a bidirectional lead screw, a motor and two sliding pieces. The lithium battery pack disclosed by the utility model is simple in structure, convenient to use and relatively high in safety, not only can be conveniently used for supplying power to equipment, but also can automatically extinguish fire in time when the battery is on fire, is relatively high in safety, and is beneficial to popularization and use.

Description

Technical Field

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

[0002] Lithium batteries are a type of battery that uses lithium metal or lithium alloy as the negative electrode material and a non-aqueous electrolyte solution. They are usually composed of a battery body, a storage box and a cover. Lithium batteries are now maturely used in new energy vehicles.

[0003] However, the existing lithium battery packs have poor safety, and most of them are not equipped with fire extinguishing structures. Since lithium batteries are prone to catch fire in high-temperature environments or after collisions, if they do not have a fire extinguishing function, they will continue to catch fire, and in severe cases, the entire vehicle will be burned, which has poor safety.

[0004] For example, an existing Chinese patent (publication number: CN213124559U) discloses a heat dissipation type lithium battery pack, wherein three lithium battery placement slots are provided on the top of the battery pack shell, lithium batteries are mounted in the lithium battery placement slots, an installation box with an opening on the right side is fixedly installed at the bottom of the battery pack shell, the installation box is filled with cooling water, and a plug cover is provided on the threaded sleeve inside the installation box.

[0005] The cooling water filled in the lithium battery pack designed as above can only play the role of heat dissipation, and no fire extinguishing structure is set on it. When the lithium battery collides strongly and catches fire, it cannot be effectively extinguished, and the safety is poor. Therefore, we have designed a high-safety lithium battery pack to solve the above problems. Utility Model Content

[0006] In order to solve the above technical problems, the utility model provides a high-safety lithium battery pack, including a shell, a sealing cover is provided on the top of the shell, a lithium battery body is provided in the shell, an air intake pipe and an exhaust pipe are fixedly inserted in the sealing cover, the air intake pipe and the exhaust pipe are used together for ventilation and heat dissipation in the shell, two sealing parts are slidably provided in the sealing cover, the two sealing parts are slidably inserted in the air intake pipe and the exhaust pipe, respectively, a driving assembly is provided in the sealing cover, the driving assembly is used to drive the two sealing parts to block the air intake pipe and the exhaust pipe, the driving assembly is connected to the sealing part, a smoke alarm is provided in the shell, and the smoke alarm is electrically connected to the driving assembly.

[0007] Preferably, the driving assembly includes a bidirectional screw, a motor, two nuts and a sliding piece, the bidirectional screw is rotatably arranged in the sealing cover, the nut is threadedly sleeved on the bidirectional screw, the motor is embedded in the sealing cover, and the driving shaft of the motor is transmission connected to one end of the bidirectional screw, the sliding piece is arranged on the nut, and the sliding piece is fixedly connected to the sealing piece, and the motor is electrically connected to the smoke alarm.

[0008] Preferably, a cavity and two sliding openings are provided in the blocking cover, the bidirectional screw is rotatably connected in the cavity, and the blocking piece is slidably inserted in the sliding openings.

[0009] Preferably, a rubber sleeve is sleeved on the outer surface of the blocking member, and the rubber sleeve abuts against the sliding opening.

[0010] Preferably, a fixing frame is provided at the bottom of the blocking cover, a fixing groove is opened at the bottom of the sliding member, a fan is provided in the fixing groove, one end of the air inlet pipe is located in the fixing groove and the other end extends out of the fixing frame, an exhaust pipe is fixedly inserted in the blocking cover, the exhaust pipe is fixedly connected to one end of the fan, and a one-way exhaust valve is provided at the other end of the exhaust pipe.

[0011] Preferably, a buffer pad is provided in the shell, the buffer pad is made of fluororubber, and the buffer pad is fixedly connected to the lithium battery body.

[0012] Compared with the related art, the high-safety lithium battery pack provided by the utility model has the following beneficial effects:

[0013] 1. In the utility model, when the lithium battery body catches fire due to over-temperature or impact, it will be detected by the smoke alarm first, and then the smoke alarm automatically starts the motor, which can make the two nuts move away from each other, and then make the two blocking parts slide and insert in the intake pipe and the exhaust pipe respectively, isolating the shell from the outside air, so that oxygen cannot enter the shell, thereby achieving the purpose of fire extinguishing and improving safety.

[0014] 2. In the utility model, by turning on the fan, the air in the shell can be quickly discharged through the exhaust pipe and the one-way exhaust valve, so that the shell is in a vacuum state, thereby accelerating the fire extinguishing of the lithium battery and further improving the safety. By setting a buffer pad, since fluororubber is resistant to high temperature and has a certain elasticity, it can not only prevent the buffer pad from melting, but also play a buffering role for the lithium battery body, which helps to increase the service life of the lithium battery body. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the external three-dimensional structure of a high-safety lithium battery pack;

[0016] Figure 2 It is a schematic diagram of the planar structure inside a high-safety lithium battery pack;

[0017] Figure 3 for Figure 2 Enlarged view of point A in the middle.

[0018] Numbers in the figure: 1. Shell; 2. Sealing cover; 3. Lithium battery body; 4. Inlet pipe; 5. Exhaust pipe; 6. Sealing piece; 7. Bidirectional screw rod; 8. Nut; 9. Motor; 10. Sliding piece; 11. Fixing bracket; 12. Fan; 13. Exhaust pipe; 14. One-way exhaust valve; 15. Smoke alarm; 16. Buffer pad. DETAILED DESCRIPTION

[0019] The embodiments of the present utility model are described in detail below. Example

[0020] Depend on Figure 1-3 A high-safety lithium battery pack is provided, comprising a shell 1, a blocking cover 2 is provided on the top of the shell 1, a lithium battery body 3 is provided in the shell 1, an air inlet pipe 4 and an exhaust pipe 5 are fixedly inserted in the blocking cover 2, the air inlet pipe 4 and the exhaust pipe 5 cooperate to ventilate and dissipate heat in the shell 1, two blocking pieces 6 are slidably provided in the blocking cover 2, the two blocking pieces 6 are slidably inserted in the air inlet pipe 4 and the exhaust pipe 5 respectively, a driving assembly is provided in the blocking cover 2, the driving assembly is used to drive the two blocking pieces 6 to block the air inlet pipe 4 and the exhaust pipe 5, the driving assembly is connected to the blocking piece 6, a smoke alarm 15 is provided in the shell 1, and the smoke alarm 15 is electrically connected to the driving assembly;

[0021] The driving assembly includes a bidirectional screw rod 7, a motor 9, two nuts 8 and a slide 10. The bidirectional screw rod 7 is rotatably arranged in the sealing cover 2. The nut 8 is threadedly sleeved on the bidirectional screw rod 7. The motor 9 is embedded in the sealing cover 2, and the driving shaft of the motor 9 is transmission connected to one end of the bidirectional screw rod 7. The slide 10 is arranged on the nut 8, and the slide 10 is fixedly connected to the sealing piece 6. The motor 9 is electrically connected to the smoke alarm 15. A cavity and two sliding openings are arranged in the sealing cover 2. The bidirectional screw rod 7 is rotatably connected in the cavity, and the sealing piece 6 is slidably inserted in the sliding opening.

[0022] In specific implementation, when in use, a hole is opened on the rear side of the shell 1 to facilitate connecting the circuit with the lithium battery body 3, so that the electric energy in the lithium battery body 3 can be output to the connected device. It should be noted that a rubber ring is set on the opening to fill the gap between the circuit and the opening to ensure the sealing. When the lithium battery body 3 catches fire due to excessive temperature or impact, it will first be detected by the smoke alarm 15, and then the smoke alarm 15 automatically starts the motor 9 to rotate the bidirectional screw 7, so that the two nuts 8 drive the two slides 10 and the sealing member 6 to move away from each other, and then the two sealing members 6 are slidably inserted in the intake pipe 4 and the exhaust pipe 5 respectively, isolating the shell 1 from the outside air, so that oxygen cannot enter the shell 1, thereby achieving the purpose of fire extinguishing and improving safety.

[0023] The outer surface of the blocking member 6 is sleeved with a rubber sleeve, and the rubber sleeve abuts against the sliding opening, so as to improve the sealing ability of the blocking member 6 to the air inlet pipe 4 and the exhaust pipe 5.

[0024] The smoke alarm 15 is divided into two types: photoelectric type and ion type. The former uses smoke to block the light path to send out an alarm, while the latter uses its own sensor to sense the ion concentration in the air. Different sensors sense different gases such as coal gas. Commonly used ones are smoke probes that detect carbon ion concentrations for fire prevention. Since the smoke alarm 15 is a prior art, it will not be described in detail in this manual. Example

[0025] Depend on Figure 1-2 A high-safety lithium battery pack is provided, comprising a shell 1, a plugging cover 2 is provided on the top of the shell 1, a lithium battery body 3 is provided in the shell 1, an air inlet pipe 4 and an exhaust pipe 5 are fixedly inserted in the plugging cover 2, the air inlet pipe 4 and the exhaust pipe 5 cooperate to ventilate and dissipate heat in the shell 1, two plugging pieces 6 are slidably provided in the plugging cover 2, the two plugging pieces 6 are slidably inserted in the air inlet pipe 4 and the exhaust pipe 5, respectively, a driving assembly is provided in the plugging cover 2, and the driving assembly is used to drive the two plugging pieces 6 to ventilate the air inlet pipe 4 and the exhaust pipe 5 is blocked, the driving assembly is connected to the blocking member 6, a smoke alarm 15 is arranged in the shell 1, and the smoke alarm 15 is electrically connected to the driving assembly, a fixing frame 11 is arranged at the bottom of the blocking cover 2, a fixing groove is opened at the bottom of the sliding member 10, a fan 12 is arranged in the fixing groove, one end of the air inlet pipe 4 is located in the fixing groove and the other end extends out of the fixing frame 11, an exhaust pipe 13 is fixedly inserted in the blocking cover 2, the exhaust pipe 13 is fixedly connected to one end of the fan 12, and a one-way exhaust valve 14 is arranged at the other end of the exhaust pipe 13.

[0026] In specific implementation, the air inside and outside the shell 1 can be isolated according to the above principle, and the fan 12 is turned on to quickly exhaust the air in the shell 1 through the exhaust pipe 13 and the one-way exhaust valve 14, so that a vacuum environment is formed in the shell 1, so that the lithium battery is deprived of oxygen and the fire is extinguished faster, further improving safety.

[0027] A buffer pad 16 is provided in the housing 1. The buffer pad 16 is made of fluororubber and is fixedly connected to the lithium battery body 3. Since fluororubber is resistant to high temperatures and has a certain elasticity, the buffer pad 16 can not only not melt but also play a buffering role for the lithium battery body 3, which helps to increase the service life of the lithium battery body 3.

[0028] The one-way exhaust valve 14, also known as a check valve or non-return valve, is usually composed of a valve body, a valve plate and a valve membrane. The principle is: when the sealed items in the bag generate gas to reach a certain pressure in the bag, the gas can push the exhaust valve plate from the inside to the outside and discharge the excess gas to the outside; when the pressure in the bag is reduced to a level that is not enough to push the valve plate open, the valve automatically closes. The valve will only open automatically when the pressure in the bag is higher than the pressure outside the bag, otherwise it will not open, and the outside air cannot enter the bag. Since the one-way exhaust valve 14 is a prior art, it will not be described in detail in this specification.

[0029] In addition, for the fan 12, we use a blower, which is usually composed of a motor, an air filter, a blower body, an air chamber, a base and an oil tank, and an oil drip nozzle. The principle is that there is a high-speed rotating rotor, and the blades on the rotor drive the air to move at high speed. The centrifugal force makes the air flow along the involute in the involute-shaped casing to the outlet of the fan 12. The high-speed airflow has a certain wind pressure. Since the fan 12 is a prior art, it will not be explained in detail in this manual.

[0030] In order to enable the smoke alarm 15 to control the motor 9, we electrically connect a controller to the smoke alarm 15, so that the controller and the motor 9 are also electrically connected, so that the switch of the motor 9 can be conveniently controlled. For the controller, by operating the controller, the controller can send an electrical signal to the motor 9 and activate it, thereby achieving the purpose of conveniently controlling the motor 9. Since the controller is a prior art, it will not be explained in detail in this manual.

[0031] Working principle:

[0032] When in use, a hole is opened on the rear side of the shell 1 to facilitate connecting the circuit with the lithium battery body 3, so that the electric energy in the lithium battery body 3 can be output to the connected device. It should be noted that a rubber ring is set on the opening to fill the gap between the circuit and the opening to ensure the sealing. When the lithium battery body 3 catches fire due to excessive temperature or impact, it will be detected by the smoke alarm 15 first, and then the smoke alarm 15 automatically starts the motor 9 to rotate the two-way screw rod 7, so that the two nuts 8 drive the two slides 10 and the sealing member 6 to move away from each other, and then the two sealing members 6 are slidably inserted into the intake pipe 4 and the exhaust pipe 5 respectively, isolating the shell 1 from the outside air and preventing oxygen from entering the shell 1. Then, the fan 12 is turned on to quickly discharge the air in the shell 1 through the exhaust pipe 13 and the one-way exhaust valve 14, so that a vacuum environment is formed in the shell 1, so that the lithium battery is extinguished due to lack of oxygen, thereby improving safety.

[0033] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-safety lithium battery pack, comprising a housing (1) with a blocking cover (2) and a lithium battery body (3) respectively disposed on the top and inside, wherein an air intake pipe (4) and an exhaust pipe (5) are fixedly inserted inside the blocking cover (2), characterized in that: Two blocking members (6) are slidably arranged in the blocking cover (2), and the two blocking members (6) are respectively slidably inserted in the air intake pipe (4) and the air exhaust pipe (5). A driving assembly for driving the two blocking members (6) to block the air intake pipe (4) and the air exhaust pipe (5) is arranged in the blocking cover (2), and a smoke alarm (15) is arranged in the housing (1), and the smoke alarm (15) is electrically connected to the driving assembly.

2. A high-safety lithium battery pack according to claim 1, characterized in that: The driving assembly comprises a bidirectional screw (7), a motor (9) and two slides (10); the bidirectional screw (7) is rotatably arranged in the blocking cover (2) and has two nuts (8) threadedly sleeved thereon; the motor (9) is embedded in the blocking cover (2) and is transmission-connected to the bidirectional screw (7) and electrically connected to the smoke alarm (15); and the two ends of the slide (10) are respectively connected to the nuts (8) and the blocking cover (6).

3. A high-safety lithium battery pack according to claim 2, characterized in that: The blocking cover (2) is provided with a cavity and two sliding openings, the bidirectional screw rod (7) is rotatably connected in the cavity, and the blocking piece (6) is slidably inserted in the sliding openings.

4. A high-safety lithium battery pack according to claim 3, characterized in that: The outer surface of the blocking piece (6) is sleeved with a rubber sleeve, and the rubber sleeve abuts against the sliding opening.

5. A high-safety lithium battery pack according to claim 2, characterized in that: A fixing frame (11) is provided at the bottom of the blocking cover (2), a fixing groove is provided at the bottom of the sliding member (10), a fan (12) is provided in the fixing groove, an exhaust pipe (13) is fixedly plugged into the blocking cover (2), the exhaust pipe (13) is fixedly connected to one end of the fan (12), and a one-way exhaust valve (14) is provided at the other end of the exhaust pipe (13).

6. A high-safety lithium battery pack according to claim 1, characterized in that: A buffer pad (16) is arranged in the housing (1); the buffer pad (16) is made of fluororubber; and the buffer pad (16) is connected to the lithium battery body (3).

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