Explosion-proof battery of electric vehicle and electric golf bag vehicle using same

Abstract

The utility model relates to an explosion-proof battery of an electric vehicle and an electric golf trolley applying the explosion-proof battery. The explosion-proof battery comprises an explosion-proof battery shell and a battery core assembly arranged in an inner cavity of the explosion-proof battery shell, at least one pressure relief opening is formed in the explosion-proof battery shell, and a cavity where the battery cell assembly is located is separated from the pressure relief opening through a breathable flame-retardant layer; and the explosion-proof battery shell is made of a metal plate. According to the explosion-proof battery disclosed by the utility model, combustion and explosion of the battery cell can be limited in the explosion-proof battery shell, explosives are prevented from splashing out, and meanwhile, flames can be isolated in the explosion-proof battery shell by the breathable flame-retardant layer, so that fire accidents are avoided, and the safety performance is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of explosion-proof batteries, and in particular relates to an explosion-proof battery for electric vehicles and an electric golf bag vehicle using the battery. Background Art

[0002] With the development of modern science and technology, lithium-ion batteries such as ternary lithium batteries and lithium iron phosphate batteries can provide energy sources for electronic devices at any time, and are therefore widely used, such as various electric vehicles, including electric bicycles, electric motorcycles, electric tricycles, electric golf bag carts, etc. Among them, electric bicycles, electric motorcycles and electric tricycles are all vehicles for transportation powered by batteries such as lithium batteries and driven by motors, while golf bag carts are used to carry golf bags for golf clubs and other items. Electric golf bag carts powered by lithium batteries can use electric drive instead of manual labor, which is more convenient and labor-saving to use.

[0003] Existing lithium-ion batteries may trigger thermal runaway when they are transported, stored or charged, if they are mechanically damaged, thermal management fails, or they are overcharged or over-discharged. After thermal runaway is triggered, a large amount of high-temperature flammable mixed gas will be generated, and the enclosed space of the shell will cause the generated heat and gas to be unable to be discharged in time, which will easily lead to explosions, endangering personal and property safety. Utility Model Content

[0004] The utility model aims to provide an explosion-proof battery for electric vehicles and an electric golf bag vehicle using the battery, so as to solve the problem that the battery is prone to explosion hazards.

[0005] An explosion-proof battery for electric vehicles of the utility model is realized as follows:

[0006] An explosion-proof battery for an electric vehicle, comprising an explosion-proof battery housing, and a battery cell assembly arranged in an inner cavity of the explosion-proof battery housing;

[0007] At least one pressure relief port is provided on the explosion-proof battery housing, and the cavity where the battery cell assembly is located is separated from the pressure relief port by a breathable flame-retardant layer;

[0008] The explosion-proof battery housing is made of metal plates.

[0009] Furthermore, the breathable flame-retardant layer is located at both ends or any one end of the battery core assembly.

[0010] Furthermore, fixing parts for fixing the air-permeable flame-retardant layer are respectively arranged on both sides of the air-permeable flame-retardant layer.

[0011] Furthermore, the two fixing members on both sides of the same breathable flame retardant layer are any one of a metal mesh plate, a metal plate frame and a metal plate with an exhaust window, or a combination of the two.

[0012] Furthermore, a protrusion is provided on the inner surface of the fixing piece located outside the breathable flame-retardant layer.

[0013] Furthermore, the explosion-proof battery housing includes an outer cover shell and end cover shells arranged at both ends of the outer cover shell, and the breathable flame-retardant layer is located on the inner side of the two or any one of the end cover shells.

[0014] Furthermore, the fixing piece located outside the breathable flame-retardant layer is arranged to fit the inner wall of the corresponding end cover, and the inner wall of the end cover is provided with an exhaust groove connected with the corresponding pressure relief port.

[0015] Furthermore, the exhaust groove includes a plurality of longitudinal grooves and transverse grooves that are interconnected, and the pressure relief port is connected to at least any corresponding longitudinal groove or transverse groove.

[0016] Furthermore, the pressure relief port is a strip-shaped hole.

[0017] Furthermore, a waterproof and flame-retardant plug is installed in the pressure relief port. When the battery cell assembly burns, the air pressure in the explosion-proof battery housing increases, and the waterproof and flame-retardant plug is separated from the pressure relief port.

[0018] Furthermore, the breathable flame retardant layer is ceramic fiber cloth or asbestos.

[0019] Furthermore, the metal plate is a steel plate or an aluminum alloy plate.

[0020] Furthermore, the battery cell assembly includes an outer insulating plate, and a plurality of battery cells arranged in an inner cavity surrounded by the outer insulating plate, and the battery cells are fixed by a battery cell bracket;

[0021] The battery cell assembly further comprises a battery cell guard plate installed on the inner side of the outer insulating plate at one end thereof, and an inner insulating plate is arranged between the battery cell guard plate and the battery cell, and between the battery cell and the power line of the battery cell assembly;

[0022] A buffer layer is arranged between one of the end covers of the explosion-proof battery housing and the outer insulating plate opposite thereto.

[0023] Furthermore, a lithium battery plug connected to a power line of the battery cell assembly is installed in one of the end covers of the explosion-proof battery housing.

[0024] Furthermore, the electric vehicle explosion-proof battery is used in an electric golf bag vehicle.

[0025] Secondly, the utility model also provides an electric golf bag vehicle, which adopts the above-mentioned electric vehicle explosion-proof battery.

[0026] After adopting the above technical solution, the utility model has the following beneficial effects:

[0027] The explosion-proof battery of the utility model places the battery cell assembly in an explosion-proof battery shell made of a metal plate, and at the same time, a pressure relief port is opened on the explosion-proof battery shell. When the battery has thermal runaway, the pressure relief port can discharge the gas generated by the battery cell to the outside of the explosion-proof battery shell, and limit the combustion and explosion of the battery cell to the explosion-proof battery shell to avoid splashing of explosives. At the same time, the breathable flame-retardant layer can isolate the flame in the explosion-proof battery shell while exhausting the gas and relieving the pressure, so as to avoid causing a fire and improve the safety performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0029] Figure 1 This is a structural diagram of an explosion-proof battery for electric vehicles according to a preferred embodiment of the utility model;

[0030] Figure 2 It is a cross-sectional view of an explosion-proof battery for electric vehicles according to a preferred embodiment of the utility model;

[0031] Figure 3 yes Figure 2 A magnified view of part A;

[0032] Figure 4 yes Figure 2 A magnified view of part B;

[0033] Figure 5 This is a structural diagram of the outer cover of an explosion-proof battery for an electric vehicle according to a preferred embodiment of the utility model;

[0034] Figure 6 It is an exploded schematic diagram of one end of an explosion-proof battery housing of an explosion-proof battery for an electric vehicle according to a preferred embodiment of the utility model;

[0035] Figure 7 It is an exploded schematic diagram of the other end of the explosion-proof battery housing of the electric vehicle explosion-proof battery in the preferred embodiment of the utility model;

[0036] Figure 8 It is a structural diagram of a cell assembly of an explosion-proof battery for an electric vehicle (lacking a top outer insulating plate and an insulating sleeve at one end) according to a preferred embodiment of the utility model;

[0037] In the figure: explosion-proof battery shell 1, outer cover shell 1-1, end cover shell 1-2, battery cell assembly 2, outer insulating plate 2-1, battery cell 2-2, battery cell bracket 2-3, insulating sleeve 2-4, battery cell guard plate 2-5, inner insulating plate 2-6, power cord 2-7, insulating pad 2-8, buffer layer 2-9, pressure relief port 3, breathable flame retardant layer 4, exhaust window 5, metal plate 6, protrusion 7, exhaust groove 8, longitudinal groove 8-1, transverse groove 8-2, waterproof flame retardant plug 9, lithium battery plug 10, charging socket 10-1, discharge socket 10-2, power cord baffle 11, through hole 12, sealing plate 13, connecting cavity 14. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the implementation of the utility model clearer, the technical solution in the implementation of the utility model will be clearly and completely described below in conjunction with the drawings in the implementation of the utility model. Obviously, the described implementation is a part of the implementation of the utility model, not all of the implementations. Based on the implementation of the utility model, all other implementations obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0039] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention.

[0040] Example 1

[0041] In this embodiment, the electric vehicle explosion-proof battery is applied to various types of electric golf bag vehicles.

[0042] Among them, the electric golf bag cart includes an electric golf bag cart that can only carry golf bags, and an electric golf bag cart that can carry both golf bags and people.

[0043] like Figure 1-8 As shown, an explosion-proof battery for an electric vehicle comprises an explosion-proof battery housing 1, and a battery cell assembly 2 arranged in an internal cavity of the explosion-proof battery housing 1; at least one pressure relief port 3 is arranged on the explosion-proof battery housing 1, and the cavity where the battery cell assembly 2 is located is separated from the pressure relief port 3 by a breathable flame-retardant layer 4; the explosion-proof battery housing 1 is made of a metal plate.

[0044] like Figure 2-4As shown, the battery cell assembly 2 is placed in the explosion-proof battery housing 1. In order to conveniently use the breathable flame-retardant layer 4 to separate the cavity where the battery cell assembly 2 is located from the pressure relief port 3, the breathable flame-retardant layer 4 is located at both ends of the battery cell assembly 2 or at either end thereof.

[0045] In this embodiment, two pressure relief ports 3 are provided, which are located near the two ends of the explosion-proof battery casing 1. Correspondingly, two breathable flame-retardant layers 4 are also provided, which are located at the two ends of the battery cell assembly 2, respectively, so as to separate the cavity where the battery cell assembly 2 is located from the pressure relief port 3, so as to achieve gas discharge while preventing flames from overflowing from the explosion-proof battery casing 1.

[0046] The arrangement of the pressure relief port 3 is not limited to the above-mentioned position, and can also be arranged on any side of the explosion-proof battery housing 1 as required.

[0047] like Figure 2-7 As shown, in order to fix the air-permeable flame-retardant layer 4 , fixing pieces for fixing the air-permeable flame-retardant layer 4 are respectively arranged on both sides of the air-permeable flame-retardant layer 4 .

[0048] The fixing piece located outside the breathable flame retardant layer 4 can effectively prevent the breathable flame retardant layer 4 from being embedded in the exhaust groove 8, thereby avoiding affecting the pressure relief effect.

[0049] The two fixing members on both sides of the same air-permeable flame-retardant layer 4 are any one of a metal mesh plate, a metal plate frame and a metal plate member 6 with an exhaust window 5, or a combination of the two.

[0050] Specifically, the fixing parts used to fix the same breathable flame retardant layer 4 can all be metal plates 6 with exhaust windows 5, or metal mesh plates, or metal plate frames, or any two of them can be selected for combination.

[0051] Among them, the mesh holes on the metal mesh plate and the inner windows of the metal plate frame can facilitate the discharge of the gas generated by the explosion.

[0052] The fixing parts are not limited to the above three structures, and other metal parts that can fix the breathable flame retardant layer 4 and have an exhaust structure can also be used.

[0053] In this embodiment, the fixing member is a metal plate member 6 with an exhaust window 5 .

[0054] Specifically, a plurality of exhaust windows 5 are provided on the metal plate 6 so that the entire metal plate 6 forms a mesh frame structure, and the fixing parts on the inner and outer sides of the breathable flame retardant layer 4 in this embodiment both adopt the metal plate 6 structure.

[0055] Compared with metal mesh plates and metal plate frames, the metal plate member 6 with the exhaust window 5 used in this embodiment can better fix the breathable flame retardant layer 4 while ensuring the exhaust effect, thereby increasing the stability of the breathable flame retardant layer 4.

[0056] The metal plate 6, the metal mesh plate and the metal plate frame can be made of steel or aluminum alloy. The metal plate 6 in this embodiment is made of aluminum alloy plate.

[0057] In order to further improve the fixing effect on the air-permeable flame-retardant layer 4 , a protrusion 7 is provided on the inner surface of the fixing piece located outside the air-permeable flame-retardant layer 4 .

[0058] The protrusion 7 can be embedded in the breathable flame retardant layer 4 by extrusion, so as to cooperate with the fixing piece inside the breathable flame retardant layer 4, so as to better ensure the stability of the breathable flame retardant layer 4 and prevent it from moving randomly.

[0059] In order to facilitate the fixation of the breathable flame-retardant layer 4, the explosion-proof battery housing 1 includes an outer cover shell 1-1 and end cover shells 1-2 arranged at both ends of the outer cover shell 1-1, and the breathable flame-retardant layer 4 is located on the inner side of the two or any one of the end cover shells 1-2.

[0060] In this embodiment, air-permeable flame-retardant layers 4 are installed on the inner sides of the two end covers 1 - 2 , and are respectively matched with the corresponding pressure relief ports 3 to ensure that the battery core 2 - 2 is pressure-relieved and flame-retardant when an explosion occurs.

[0061] In order to connect the pressure relief port 3 through the breathable flame retardant layer 4, the fixing part located outside the breathable flame retardant layer 4 is arranged in contact with the inner wall of the corresponding end cover shell 1-2, and the inner wall of the end cover shell 1-2 is provided with an exhaust groove 8 connected with the corresponding pressure relief port 3.

[0062] Specifically, an embedding groove matching with the fixing piece and the breathable flame retardant layer 4 is provided on the inner wall of the end cover shell 1 - 2 , and the breathable flame retardant layer 4 and the fixing piece on the outer side thereof are assembled in the corresponding embedding groove.

[0063] In order to achieve the communication between the exhaust groove 8 and the pressure relief port 3, the exhaust groove 8 includes a plurality of longitudinal grooves 8-1 and transverse grooves 8-2 that are connected to each other, and the pressure relief port 3 is connected to at least any corresponding longitudinal groove 8-1 or transverse groove 8-2.

[0064] The structure of the exhaust groove 8 is not limited to the above-mentioned transverse and longitudinal arrangements, and any groove structure that can achieve communication between the outer side of the breathable flame-retardant layer 4 and the pressure relief port 3 is acceptable.

[0065] The pressure relief port 3 is located on the outer cover shell 1-1 at the bottom of the end cover shell 1-2. The gas generated by the explosion can pass through the breathable flame-retardant layer 4 and the exhaust groove 8 in sequence and be discharged from the corresponding pressure relief port 3 to the outside of the explosion-proof battery.

[0066] In order to ensure the pressure relief effect, the pressure relief port 3 is a strip-shaped hole.

[0067] The shape of the pressure relief port 3 is not limited to a strip-shaped hole, and it can also be a circular hole or a square hole structure arranged in a row.

[0068] When the pressure relief port 3 is arranged on any side of the explosion-proof battery casing 1, that is, on the outer cover shell 1-1 corresponding to any side of the battery cell assembly 2, the breathable flame-retardant layer 4, the corresponding fixing parts and the exhaust groove 8 can all be arranged on the inner side of the corresponding pressure relief port 3, and its specific structure can refer to the method of setting the two ends of the pressure relief port 3.

[0069] In addition, when the pressure relief port 3 is located at the above-mentioned position, that is, at any side of the explosion-proof battery housing 1, the breathable flame-retardant layer 4 and the corresponding fixing parts can also be placed on the outside of the explosion-proof battery housing 1, and the breathable flame-retardant layer 4 can be fixed by connecting the fixing parts to the explosion-proof battery housing 1 with screws or the like.

[0070] In order to achieve the waterproof performance of the explosion-proof battery, a waterproof and flame-retardant plug 9 is installed in the pressure relief port 3. When the battery cell assembly 2 burns, the air pressure in the explosion-proof battery housing 1 increases, and the waterproof and flame-retardant plug 9 is separated from the pressure relief port 3 outward.

[0071] Specifically, the outer shell of the waterproof and flame-retardant plug 9 is fixed to the outer cover shell 1-1 by glue, and the glue can play a sealing and waterproof role after solidification; when the battery cell 2-2 burns, the air pressure inside the explosion-proof battery shell 1 increases, and the pressure will push the waterproof and flame-retardant plug 9 to detach from the pressure relief port 3, thereby realizing the exhaust and pressure relief of the pressure relief port 3.

[0072] The waterproof and flame-retardant plug 9 is made of flame-retardant materials such as aluminum alloy to prevent the high-temperature gas released by the combustion of the battery cell 2 - 2 from igniting it.

[0073] When the explosion-proof battery is placed in the battery slot of the electric golf bag vehicle, the pressure relief port 3 is arranged downward, and a vent hole corresponding to the pressure relief port 3 is arranged at the bottom of the battery slot to facilitate the removal of the waterproof and flame-retardant plug 9 and the discharge of gas.

[0074] In order to realize the exhaust and flame retardant function of the pressure relief port 3, the breathable and flame retardant layer 4 is ceramic fiber cloth or asbestos.

[0075] The breathable flame retardant layer 4 is not limited to ceramic fiber cloth and asbestos, and other breathable, high temperature resistant and flame retardant materials can also be used.

[0076] In order to completely isolate the flame inside the explosion-proof battery housing 1, the thickness of the ceramic fiber cloth is 5 to 20 mm.

[0077] In order to further improve the structural strength and explosion-proof performance of the explosion-proof battery housing 1, the metal plate is a steel plate or an aluminum alloy plate.

[0078] When the thickness of the metal plate is small, the combustion and explosion of the battery cell 2-2 may easily cause bulging and deformation of the explosion-proof battery shell 1. Therefore, in order to ensure the strength of the explosion-proof battery shell 1, effectively limit the combustion and explosion of the battery cell 2-2 within the explosion-proof battery shell 1 and avoid bulging and deformation of the explosion-proof battery shell 1, when the metal plate is a steel plate, the thickness of the steel plate is 1 to 5 mm; when the metal plate is an aluminum alloy plate, the thickness of the aluminum alloy plate is 2 to 10 mm.

[0079] In this embodiment, the explosion-proof battery housing 1, namely the outer cover shell 1-1 and the two end covers 1-2 are made of aluminum alloy plates.

[0080] When the steel plate selected for the explosion-proof battery housing 1 , a stainless steel plate may be used.

[0081] The selection of the explosion-proof battery housing 1 is not limited to the above two metal materials, and any metal material that can withstand the high temperature of the combustion of the battery cell 2-2 and the impact of the explosion of the battery cell 2-2 can be used.

[0082] like Figure 2 and Figure 8 As shown, the battery cell assembly 2 includes an outer insulating plate 2-1 and a plurality of battery cells 2-2 arranged in an inner cavity surrounded by the outer insulating plate 2-1, and the battery cells 2-2 are fixed by a battery cell bracket 2-3.

[0083] There are two battery cell holders 2 - 3 , which are arranged opposite to each other in upper and lower positions, and two ends of the battery cell 2 - 2 are respectively installed in the opposite holder grooves of the two battery cell holders 2 - 3 .

[0084] The provision of the outer insulating plate 2 - 1 can achieve insulation between the explosion-proof battery housing 1 and the battery cell 2 - 2 .

[0085] Preferably, the battery cell assembly 2 further includes an insulating sleeve 2 - 4 , which is sleeved around the periphery of both ends of the battery cell assembly 2 and is used to fix the outer insulating plate 2 - 1 around the periphery of the battery cell assembly 2 .

[0086] The battery cell assembly 2 also includes a battery cell protection plate 2-5 installed on the inner side of the outer insulating plate 2-1 at one end thereof, and an inner insulating plate 2-6 is provided between the battery cell protection plate 2-5 and the battery cell 2-2, and between the battery cell 2-2 and the power line 2-7 of the battery cell assembly 2.

[0087] The power line 2-7 is located above the upper battery cell support 2-3, and the inner insulating plate 2-6 on the top of the battery cell 2-2 can be used to separate the power line 2-7 from the battery cell 2-2, thereby achieving insulation between the two.

[0088] Preferably, insulating pads 2-8 are provided on both sides of the power cord 2-7, and a cavity is formed between the two insulating pads 2-8, thereby facilitating the laying of the power cord 2-7 and avoiding extrusion and wear on the power cord 2-7.

[0089] Preferably, the outer insulating plate 2-1, the inner insulating plate 2-6, the insulating sleeve 2-4 and the insulating pad 2-8 can all be made of flame-retardant plastic materials such as PPS.

[0090] A buffer layer 2 - 9 is provided between one of the end covers 1 - 2 of the explosion-proof battery housing 1 and the outer insulating plate 2 - 1 opposite thereto.

[0091] Specifically, the buffer layer 2 - 9 is made of a filling material such as foam, which has a certain buffering effect and insulating effect, and can prevent the battery cell assembly 2 from moving freely in the explosion-proof battery housing 1 .

[0092] In order to realize the charging and discharging of the battery cell 2 - 2 , a lithium battery plug 10 connected to the power line 2 - 7 of the battery cell assembly 2 is installed in one of the end covers 1 - 2 of the explosion-proof battery housing 1 .

[0093] like Figure 2 , Figure 6 and Figure 7 As shown, one of the end cover shells 1-2 is a plate-like structure, which can be sealed at one end of the outer cover shell 1-1 by means of, but not limited to, welding. The other end cover shell 1-2 is a box-shaped structure with a cavity, and the cavity opening faces outward. The end cover shell 1-2 is fixed to the other end of the outer cover shell 1-1 by means of glue and fixing pins.

[0094] The lithium battery plug 10 is installed in the cavity of the box-shaped end cover 1-2, and the cavity is sealed by a sealing plate 13. The sealing plate 13 can be connected to the corresponding end cover 1-2 by screws.

[0095] Preferably, the sealing plate 13 may be made of, but not limited to, flame-retardant plastic material.

[0096] A connecting cavity 14 is provided on the inner wall of the box-shaped end cover 1-2 facing the battery cell assembly 2, and the connecting head of the lithium battery plug 10 extends into the connecting cavity 14. A power cord baffle 11 is provided at the opening of the connecting cavity 14. The power cord 2-7 passes through the wire hole on the power cord baffle 11 and is connected to the connecting head in the connecting cavity 14.

[0097] The breathable flame-retardant layer 4 is fitted at the end of the plate-shaped end cover shell 1-2, and the metal plate 6 on the inner side is welded to the inner wall of the outer cover shell 1-1, and the end cover shell 1-2 is connected and fixed to the outer cover shell 1-1 by welding, so as to ensure the stability of the breathable flame-retardant layer 4 at this end.

[0098] The air-permeable flame-retardant layer 4 matched with the box-shaped end cover 1-2 is located below the connection cavity 14, and the fixing parts inside the air-permeable flame-retardant layer 4 are fixed to the corresponding end cover 1-2 by screws and other connecting parts, thereby ensuring the fixing effect of the outer air-permeable flame-retardant layer 4. And the bottom of the end cover 1-2 is provided with a through hole 12 connecting the exhaust groove 8 and the corresponding pressure relief port 3.

[0099] When the battery cell 2-2 experiences thermal runaway and explosion, the explosion is confined to the space enclosed by the outer cover 1-1 and the two end covers 1-2, that is, the cavity where the battery cell assembly 2 is located. Since the explosion-proof battery housing 1, that is, the outer cover 1-1 and the two end covers 1-2 are made of aluminum alloy plates, the explosion will not extend to the internal space of the plug box 1-21.

[0100] In order to facilitate the connection of the explosion-proof battery to the golf bag and the external power supply, the explosion-proof battery housing 1 is provided with windows corresponding to the charging socket 10 - 1 and the discharging socket 10 - 2 of the lithium battery plug 10 .

[0101] The charging socket 10-1 is used to connect an external power source, and is located on the side of the explosion-proof battery housing 1, that is, on the outer cover shell 1-1; the discharging socket 10-2 is used to connect an electric vehicle such as an electric golf bag car, and is located at the end of the explosion-proof battery housing 1, that is, on the sealing plate 1-22.

[0102] The charging socket 10 - 1 and the discharging socket 10 - 2 of the lithium battery plug 10 may be the same interface, that is, the interface may be connected to the golf bag cart and may also be connected to an external power source, and may be adjusted according to specific needs.

[0103] When the electric vehicle explosion-proof battery of the utility model is used, it is placed in the battery slot of the electric golf bag vehicle, with the pressure relief port 3 facing downward and the side where the lithium battery plug 10 is located facing forward. The power cord connector on the electric golf bag vehicle is plugged into the discharge socket 10-2, and the electric golf bag vehicle can be powered by the explosion-proof battery.

[0104] During the use of the explosion-proof battery, if thermal runaway occurs, the gas generated by the battery cell 2-2 will be discharged from the pressure relief port 3 in time. If the battery cell 2-2 explodes, the explosion range will be limited to the explosion-proof battery casing 1, which can effectively prevent the explosive from splashing randomly. The breathable flame-retardant layer 4 can block the flame in the explosion-proof battery casing 1 while discharging the gas, thereby preventing fire and improving the safety of the battery and the electric golf bag car.

[0105] When the electric vehicle explosion-proof battery of this embodiment is used in an electric golf bag, the pressure relief port 3 faces downward, so that high-temperature gas can be discharged downward during exhaust and pressure relief, thereby avoiding damage to other components of the electric golf bag.

[0106] Example 2

[0107] This embodiment also provides an explosion-proof battery for an electric vehicle, and its structure is substantially the same as that of Embodiment 1, except that this embodiment is provided with one pressure relief port, and the setting of the pressure relief port can refer to any one of the pressure relief ports in Embodiment 1. Similarly, the setting of the breathable flame-retardant layer matched with the pressure relief port can also refer to Embodiment 1.

[0108] Example 3

[0109] This embodiment provides an electric golf bag vehicle, which uses the electric vehicle explosion-proof battery disclosed in the above embodiment.

[0110] The electric vehicle explosion-proof battery can be applied to various types of electric vehicles, such as electric bicycles, electric motorcycles, electric tricycles, electric scooters, electric golf carts, and electric golf bag carts, and the electric vehicle explosion-proof battery, regardless of its shape and specifications, is within the scope of the explosion-proof battery protected by the present utility model.

[0111] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without deviating from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. An explosion-proof battery for electric vehicles, characterized in that: It comprises an explosion-proof battery casing (1), and a battery cell assembly (2) arranged in an internal cavity of the explosion-proof battery casing (1); The explosion-proof battery housing (1) is provided with at least one pressure relief port (3), and the cavity where the battery cell assembly (2) is located is separated from the pressure relief port (3) by a breathable flame-retardant layer (4); The explosion-proof battery housing (1) is made of metal plates.

2. The explosion-proof battery for electric vehicles according to claim 1, characterized in that: The air-permeable flame-retardant layer (4) is located at both ends or any one end of the battery core assembly (2).

3. The explosion-proof battery for electric vehicles according to claim 1, characterized in that: Fixing pieces for fixing the air-permeable flame-retardant layer (4) are respectively arranged on both sides of the air-permeable flame-retardant layer (4).

4. The explosion-proof battery for electric vehicles according to claim 3, characterized in that: The two fixing members on both sides of the same air-permeable flame-retardant layer (4) are any one of a metal mesh plate, a metal plate frame and a metal plate member (6) with an exhaust window (5), or a combination of the two.

5. The explosion-proof battery for electric vehicles according to claim 4, characterized in that: A protrusion (7) is provided on the inner surface of the fixing piece located outside the air-permeable flame-retardant layer (4).

6. The explosion-proof battery for electric vehicles according to claim 3, characterized in that: The explosion-proof battery housing (1) comprises an outer cover shell (1-1) and end cover shells (1-2) arranged at both ends of the outer cover shell (1-1), and the air-permeable flame-retardant layer (4) is located on the inner side of the two or any one of the end cover shells (1-2).

7. The explosion-proof battery for electric vehicles according to claim 6, characterized in that: The fixing piece located outside the breathable flame retardant layer (4) is arranged to fit the inner wall of the corresponding end cover shell (1-2), and the inner wall of the end cover shell (1-2) is provided with an exhaust groove (8) connected to the corresponding pressure relief port (3).

8. The explosion-proof battery for electric vehicles according to claim 7, characterized in that: The exhaust groove (8) comprises a plurality of longitudinal grooves (8-1) and transverse grooves (8-2) that are connected to each other, and the pressure relief port (3) is connected to at least any corresponding longitudinal groove (8-1) or transverse groove (8-2).

9. The explosion-proof battery for electric vehicles according to claim 1, characterized in that: The pressure relief port (3) is a strip-shaped hole.

10. The explosion-proof battery for electric vehicles according to claim 1, characterized in that: A waterproof and flame-retardant plug (9) is installed in the pressure relief port (3); when the battery cell assembly (2) burns, the air pressure in the explosion-proof battery housing (1) increases, and the waterproof and flame-retardant plug (9) moves outwardly away from the pressure relief port (3).

11. The explosion-proof battery for electric vehicles according to claim 1, characterized in that: The air-permeable flame-retardant layer (4) is ceramic fiber cloth or asbestos.

12. The explosion-proof battery for electric vehicles according to claim 1, characterized in that: The metal plate is an aluminum alloy plate or a steel plate.

13. The explosion-proof battery for electric vehicles according to claim 1, characterized in that: The battery cell assembly (2) comprises an outer insulating plate (2-1) and a plurality of battery cells (2-2) arranged in an inner cavity surrounded by the outer insulating plate (2-1), wherein the battery cells (2-2) are fixed by a battery cell bracket (2-3); The battery cell assembly (2) further comprises a battery cell protection plate (2-5) mounted on the inner side of the outer insulating plate (2-1) at one end thereof, and an inner insulating plate (2-6) is arranged between the battery cell protection plate (2-5) and the battery cell (2-2), and between the battery cell (2-2) and a power line (2-7) of the battery cell assembly (2); A buffer layer (2-9) is provided between one of the end covers (1-2) of the explosion-proof battery housing (1) and an outer insulating plate (2-1) opposite thereto.

14. The explosion-proof battery for electric vehicles according to claim 1, characterized in that: A lithium battery plug (10) connected to a power line (2-7) of the battery cell assembly (2) is installed in one of the end covers (1-2) of the explosion-proof battery housing (1).

15. The explosion-proof battery for electric vehicles according to claim 1, characterized in that: The electric vehicle explosion-proof battery is applied to an electric golf bag vehicle.

16. An electric golf bag vehicle, characterized in that: It adopts the electric vehicle explosion-proof battery as described in any one of claims 1-15.

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