An electric bicycle lithium battery pack structure with gas collection warning and explosion-proof function

Abstract

The present invention discloses a lithium battery pack structure for electric bicycles with gas collection warning and explosion-proof functions, characterized in that it comprises an explosion-proof box, a lithium battery pack and a gas collection module, wherein the lithium battery pack is encapsulated in a sealed inner cavity of the explosion-proof box, the gas collection module is installed outside the explosion-proof box, and the gas collection module comprises a bag-type or bladder-type gas collection bag that can be expanded and unfolded after internal inflation, and its inner cavity is connected to the inner cavity of the explosion-proof box through a gas collection pipe, and the gas collection bag and the gas collection pipe are detachably connected. The present invention reduces exhaust gas pollution by setting up the gas collection bag, can isolate air to prevent explosion, and also ensures the personal safety of the driver.

Description

Technical Field

[0001] The invention relates to the explosion-proof safety field of lithium batteries for electric bicycles, and in particular to a lithium battery pack structure for electric bicycles with gas collection, early warning and explosion-proof functions. Background Art

[0002] Due to the advantages of lithium batteries such as greater energy and greater environmental protection, after the implementation of the new national standard, almost all electric bicycles use lithium batteries as power sources; currently, the lithium battery pack of electric bicycles usually installs multiple batteries in series and / or parallel and encapsulates them in an explosion-proof box. However, compared with non-flammable traditional lead-acid batteries, lithium batteries use lithium metal or lithium alloy as positive / negative electrode materials and use wastewater electrolyte solutions, which makes the chemical properties of lithium batteries very active. They are prone to explosion under extreme conditions such as high temperature, overcharging, and short circuit, and the safety of closed battery boxes cannot be guaranteed. In addition, some battery or electric bicycle manufacturers use pressure relief valves as explosion-proof safety measures to directly discharge the gas and volatile organic matter in the lithium battery pack to achieve the purpose of reducing the pressure in the lithium battery. However, the volatile gases and organic matter will pollute the environment, and if the lithium battery fails at high temperature, the discharged gas will burn and explode when it comes into contact with air or open flames. Summary of the invention

[0003] The purpose of the present invention is to provide an electric bicycle lithium battery pack structure with gas collection warning and explosion-proof function for flammable and explosive electric bicycle lithium batteries, aiming to solve the problem that when the lithium battery fails, the flammable and explosive polluted gases released and discharged will burn and explode when they come into contact with air or open flames, which not only pollutes the air but also causes casualties to the driver.

[0004] In order to achieve the above technical effects, the technical solution adopted by the present invention is:

[0005] A lithium battery pack structure for an electric bicycle with gas collecting, early warning and explosion-proof functions, characterized in that it comprises an explosion-proof box, a lithium battery pack and a gas collecting module, wherein the lithium battery pack is encapsulated in a sealed inner cavity of the explosion-proof box, and the gas collecting module is installed on the outside of the explosion-proof box, and the gas collecting module comprises a gas collecting bag of a bag-type or bladder-type structure which can expand and unfold after internal inflation, and the inner cavity of the gas collecting bag is connected to the inner cavity of the explosion-proof box through a gas collecting pipe, and the gas collecting bag and the gas collecting pipe are detachably connected.

[0006] Furthermore, a one-way valve is sealed and fixedly installed at the bag opening of the air collecting bag, and the air collecting bag is detachably connected to the air collecting pipe via the one-way valve.

[0007] Furthermore, a solenoid valve is installed on the gas collecting pipe, and a pressure switch is installed at one end of the gas collecting pipe connected to the inner cavity of the explosion-proof box, and the pressure switch is respectively connected to the solenoid valve and the lithium battery pack cable.

[0008] Furthermore, the pressure switch is also connected to an alarm of the electric vehicle via a cable.

[0009] Furthermore, a cable outlet for a lithium battery pack is provided on one side of the explosion-proof box, a clamp ring is provided in a sealing clamp inside the cable outlet, a conical clamp rib inclined outward is provided on the inner wall of the clamp ring, the cable of the lithium battery pack is passed through the conical clamp rib, and is sealed and fixedly connected to the clamp ring by a sealant filled in the clamp ring.

[0010] Furthermore, the outer side of the lithium battery pack is wrapped with a flame retardant shock absorbing sponge.

[0011] Furthermore, the air collecting bag is an accordion-shaped folding structure.

[0012] Furthermore, the air collecting bag is a serpentine or Z-shaped multi-layer folded structure.

[0013] Furthermore, the air collecting bag is a curled structure.

[0014] Furthermore, the air collecting bag is arranged above the explosion-proof box, and a cover plate is arranged above the air collecting bag, and the cover plate can be pushed open after the air collecting bag is inflated.

[0015] Furthermore, the gas collecting bag is made of aramid, polytetrafluoroethylene, polyimide, silicone fluororubber or fire-resistant fiber paper.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The present invention connects the inner cavity of the explosion-proof box and the air collecting bag through an air collecting pipe, so that the flammable and explosive polluted gases released and discharged when the lithium battery fails can be collected into the air collecting bag, ensuring that the discharged polluted gases will not burn or explode due to contact with air or open flames, reducing exhaust gas pollution in the air and ensuring the safety of drivers.

[0018] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail in conjunction with the accompanying drawings and embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 It is a schematic diagram of the cable connection structure of the pressure switch, solenoid valve and other components of the present invention;

[0021] Figure 3It is a structural schematic diagram of the cable outlet on the explosion-proof box of the present invention;

[0022] Figure 4 A schematic structural diagram of an embodiment of an air collecting bag of the present invention;

[0023] Figure 5 for Figure 4 A-direction view;

[0024] Figure 6 It is a structural schematic diagram of another embodiment of the air collecting bag of the present invention;

[0025] Figure 7 It is a schematic structural diagram of the third embodiment of the air collecting bag of the present invention.

[0026] The numbers and corresponding names in the figure are:

[0027] 1. Explosion-proof box, 2. Gas collecting bag, 3. Gas collecting pipe,

[0028] 4. Lithium battery pack, 5. Pressure switch, 6. Solenoid valve,

[0029] 7. Check valve, 8. Cable, 9. Clamp ring,

[0030] 10. Clamping bars, 11. Sealant. DETAILED DESCRIPTION

[0031] A lithium battery pack structure for electric bicycles with gas collection warning and explosion prevention functions, such as Figure 1 and Figure 2 As shown, it includes an explosion-proof box 1, a lithium battery pack 4 and a gas collection module. The explosion-proof box 1 includes a box body and a box cover, which are sealed and connected by a sealant to form a sealed inner cavity. The lithium battery pack 4 is encapsulated in the inner cavity of the explosion-proof box 1, and the outer side of the lithium battery pack 4 is wrapped with a flame retardant shock-absorbing sponge (not shown in the figure). The gas collection module includes a bag-type or bladder-type gas collection bag 2 that can be expanded and unfolded after internal inflation, and its material is a high-temperature resistant material, such as aramid, polytetrafluoroethylene, polyimide, silicone fluorine rubber, fire-resistant fiber paper, etc. The gas collection bag 2 is installed on the outside of the explosion-proof box 1, and its inner cavity is connected to the inner cavity of the explosion-proof box 1 through a gas collecting pipe 3 fixedly installed on the explosion-proof box 1 to form a gas collection channel. The bag mouth of the gas collection bag 2 is sealed and fixedly installed with a one-way valve 7, and the gas collection bag 2 is detachably connected to the gas collecting pipe 3 through the one-way valve 7. The gas collecting pipe 3 is provided with a pressure switch 5 at one end connected to the inner cavity of the explosion-proof box 1, and the gas collecting pipe 3 is provided with a solenoid valve 6 between the pressure switch 5 and the one-way valve 7. The pressure switch 5 is respectively connected to the solenoid valve 6 and the lithium battery pack 4 through a cable 8, and the pressure switch 5 is also connected to the alarm of the electric vehicle through the cable 8.

[0032] like Figure 3As shown, a cable outlet for the lithium battery pack 4 is provided on one side of the explosion-proof box 1, and a flexible one-way clamp ring 9 is sealed inside the cable outlet. A conical clamp rib 10 inclined outward is provided on the inner wall of the clamp ring 9. The cable of the lithium battery pack 4 is passed through the conical clamp rib 10 and is sealed and fixedly connected to the clamp ring 9 by a sealant 11 filled in the clamp ring 9.

[0033] As a preference, the air collecting bag 2 may adopt an accordion-like folding structure (such as Figure 4 and 5 As shown), serpentine or Z-shaped multi-layer folded structures (such as Figure 6 ), or a curled structure (as shown Figure 7 As shown), the gas collecting bag 2 is convenient for the gas collecting bag 2 to expand and unfold gradually and rapidly as the internal gas increases during the gas collecting process. More preferably, the gas collecting bag 2 is arranged above the explosion-proof box 1, and a cover plate (not shown in the figure) is arranged above the gas collecting bag 2. When the gas collecting bag 2 is inflated to a certain extent, the cover plate can be pushed open to remind the driver to take measures at this time and escape from the scene as soon as possible. The setting of the cover plate can be understood as an openable baffle plate can be added above the corresponding position of the gas collecting bag as a cover plate when the electric vehicle structure is designed. It can also be understood as an open box body is arranged at the corresponding position of the gas collecting bag on the explosion-proof box, the gas collecting bag is placed in the box body, and a rotatable cover plate is arranged at the open position of the box body; the box body can have four sides, or it can be a simple door-type structure, that is, it only has two sides for limiting the left and right sides of the gas collecting bag, and the top of the cover plate uses one end to overlap a limiting side, and the other end is rotatably hinged to another limiting side.

[0034] The working principle of the present invention is as follows: when a lithium battery pack fails, a single lithium battery will discharge gas and volatile organic matter through its own pressure relief valve, causing the pressure in the explosion-proof box to increase. When the pressure reaches the set value, the pressure switch will emit two signals. One signal is sent to the electric vehicle alarm through a cable, and the electric vehicle horn sounds an alarm to remind the driver to escape quickly; the other signal is sent to the solenoid valve through a cable to open the solenoid valve, so that the gas discharged from the battery pack can flow into the gas collection bag, effectively isolating the air and preventing the lithium battery pack from exploding. Subsequent electric vehicle maintenance personnel can remove the one-way valve and the gas collection bag as a whole, and treat the exhaust gas in the gas collection bag through a professional exhaust gas treatment device to reduce exhaust gas pollution.

[0035] The present invention is not limited to the above-mentioned specific implementation modes. For ordinary technicians in this field, various changes made based on the above-mentioned conception without creative work all fall within the protection scope of the present invention.

Claims

1. A lithium battery pack structure for electric bicycles with gas collection, early warning and explosion-proof functions, characterized in that: The invention comprises an explosion-proof box, a lithium battery pack and a gas collecting module, wherein the lithium battery pack is encapsulated in a sealed inner cavity of the explosion-proof box, the gas collecting module is installed on the outside of the explosion-proof box, the gas collecting module comprises a gas collecting bag of a bag-type or sac-type structure which can be expanded and unfolded after internal inflation, the inner cavity of the gas collecting module is connected with the inner cavity of the explosion-proof box through a gas collecting pipe, and the gas collecting bag and the gas collecting pipe are detachably connected; a cable lead-out port for the lithium battery pack is provided on one side of the explosion-proof box, a sealing clamp in the cable lead-out port is provided with a clamping ring, the inner wall of the clamping ring is provided with a conical clamping rib inclined outward, the cable of the lithium battery pack is passed through the conical clamping rib, and is sealed and fixedly connected with the clamping ring by a sealant filled in the clamping ring; the gas collecting bag is provided above the explosion-proof box, a cover plate is provided above the gas collecting bag, the gas collecting bag is located in an open box body, the cover plate is hinged at the open position of the box body, and the cover plate can be pushed open after the gas collecting bag is inflated.

2. The electric bicycle lithium battery pack structure with gas collection warning and explosion-proof function according to claim 1 is characterized in that: The bag opening of the air collecting bag is sealed and fixedly installed with a one-way valve, and the air collecting bag is detachably connected to the air collecting pipe through the one-way valve.

3. The electric bicycle lithium battery pack structure with gas collection warning and explosion-proof function according to claim 1 is characterized in that: The gas collecting pipe is equipped with a solenoid valve, and a pressure switch is installed at one end of the gas collecting pipe connected to the inner cavity of the explosion-proof box. The pressure switch is respectively connected to the solenoid valve and the lithium battery pack cable.

4. The electric bicycle lithium battery pack structure with gas collection warning and explosion prevention function according to claim 3 is characterized in that: The pressure switch is also connected to an alarm of the electric vehicle via a cable.

5. The electric bicycle lithium battery pack structure with gas collection warning and explosion prevention function according to claim 1 is characterized in that: The outer side of the lithium battery pack is wrapped with a flame retardant shock absorbing sponge.

6. The electric bicycle lithium battery pack structure with gas collection warning and explosion prevention function according to claim 1 is characterized in that: The air collecting bag is an accordion-shaped folding structure, or a Z-shaped multi-layer folding structure.

7. The electric bicycle lithium battery pack structure with gas collection warning and explosion prevention function according to claim 1 is characterized in that: The air collecting bag is a curled structure.

8. The electric bicycle lithium battery pack structure with gas collection warning and explosion prevention function according to claim 1 is characterized in that: The gas collecting bag is made of aramid, polytetrafluoroethylene, polyimide, silicone fluororubber or fire-resistant fiber paper.

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