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 battery, the explosion-proof battery of the electric vehicle comprises a battery shell and a sealing plate, and a battery core assembly is arranged in the battery shell; at least one sealing plate is arranged, and at least one exhaust port located on the battery shell is correspondingly formed in one side, deviating from the cavity where the battery cell assembly is located, of each sealing plate; when the air pressure in the cavity where the battery cell assembly is located rises, the sealing plate moves towards the side where the exhaust port is located, so that the air in the cavity where the battery cell assembly is located is exhausted to the outside of the battery shell through the exhaust port; and when the air pressure in the cavity where the battery cell assembly is located is reduced, the sealing plate moves towards the side where the battery cell assembly is located until the cavity where the battery cell assembly is located is separated from the exhaust port. According to the utility model, the gas generated by explosion can be exhausted out of the battery shell from the exhaust port, so that the combustion and explosion of the battery core assembly are limited in the battery shell, explosives are prevented from splashing out, the fire hazard condition is avoided, and the safety performance is improved.

Description

Technical Field

[0001] This utility model belongs to the field of explosion-proof battery technology, specifically relating to an explosion-proof battery for electric vehicles and an electric golf bag cart using the battery. Background Technology

[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 in various electric vehicles, including electric bicycles, electric motorcycles, electric tricycles, and electric golf bag carts. Electric bicycles, electric motorcycles, and electric tricycles are all vehicles powered by batteries such as lithium batteries and driven by motors. Golf bag carts, on the other hand, are used to carry golf bags containing golf clubs and other items. Electric golf bag carts powered by lithium batteries can use electric drive to replace manual labor, making them more convenient and less strenuous to use.

[0003] Existing lithium-ion batteries may experience thermal runaway if subjected to mechanical damage, thermal management failure, overcharging, or over-discharging during handling, storage, or charging. Once thermal runaway is triggered, a large amount of high-temperature flammable gas mixture will be generated. The enclosed space of the casing will prevent the generated heat and gas from being dissipated in time, which can easily lead to an explosion, endangering personal safety and property. Utility Model Content

[0004] The purpose of this invention is to provide an explosion-proof battery for electric vehicles and an electric golf bag cart using the battery, in order to solve the problem that batteries are prone to causing explosion hazards.

[0005] The present invention relates to an explosion-proof battery for electric vehicles and an electric golf bag cart using the battery, which is implemented as follows:

[0006] An explosion-proof battery for electric vehicles, comprising

[0007] Battery casing, inside which battery cell assembly is installed;

[0008] The sealing plate is provided with at least one, and each sealing plate has at least one exhaust port on the side opposite to the cavity where the cell assembly is located.

[0009] Under normal conditions, the exhaust port and the cavity containing the battery cell assembly are located on opposite sides of the sealing plate corresponding to the exhaust port. The sealing plate can isolate the space on both sides to a certain extent, namely the space (exhaust cavity) between the cavity containing the battery cell assembly and the exhaust port.

[0010] When the gas pressure inside the cavity where the battery cell assembly is located increases, the sealing plate moves toward the side where the exhaust port is located, so that the gas inside the cavity where the battery cell assembly is located is discharged to the outside of the battery casing through the exhaust port;

[0011] When the air pressure inside the cavity where the battery cell assembly is located decreases, the sealing plate moves toward the side where the battery cell assembly is located until it separates the cavity where the battery cell assembly is located from the exhaust port.

[0012] Furthermore, the battery housing includes a cylindrical outer shell and end plates disposed at both ends of the outer shell, the sealing plate being located inside the end plate, and an exhaust cavity being provided between the sealing plate and the end plate.

[0013] One sealing plate can be provided, that is, the inner side of the end plate at either end, and the corresponding exhaust port is located on the battery casing on the outer side of the sealing plate.

[0014] Two sealing plates can be set, located on the inner side of the two end plates respectively, while the exhaust port is set on the battery casing on the outer side of the corresponding sealing plate.

[0015] The battery casing can be a one-piece structure, that is, the cylindrical outer shell and the end plates at both ends are integrally formed; or the battery casing can be a split structure, that is, the cylindrical outer shell and the end plates at both ends are connected by welding or bolts.

[0016] Furthermore, the exhaust port is located on the outer wall of the exhaust cavity.

[0017] Furthermore, the exhaust port is located on the outer casing.

[0018] Furthermore, an elastic element is provided between the sealing plate and the end plate at its location.

[0019] The function of the elastic element is to provide an initial thrust to the sealing plate, so that under normal conditions the sealing plate can separate the cavity where the cell assembly is located from the exhaust cavity; when the gas pressure in the cavity where the cell assembly is located increases, the sealing plate can overcome the thrust of the elastic element and move towards the side where the exhaust cavity is located, so that the gas in the cavity where the cell assembly is located can be discharged to the outside of the battery casing through the exhaust port.

[0020] The elastic element can be any common component that can provide appropriate elasticity.

[0021] The elastic elements can be set in any number at any position between the sealing plate and the corresponding end plate, as long as the sealing plate can roughly separate the cavity where the battery cell assembly is located from the exhaust cavity under normal conditions; and when the air pressure in the cavity where the battery cell assembly is located increases, the sealing plate can overcome the thrust of the elastic elements and move in the direction of the exhaust cavity (away from the direction of the battery cell assembly).

[0022] Generally speaking, setting the elastic elements in a symmetrical or uniform manner may achieve better results.

[0023] Furthermore, the elastic element is a spring;

[0024] The spring is mounted on its corresponding end plate and / or end plate.

[0025] Furthermore, a protruding post is provided on the inner wall of the end plate at the end where the sealing plate is located, and a through hole is provided on the sealing plate to accommodate the protruding post, and the spring is sleeved on the protruding post.

[0026] Furthermore, the elastic element is a spring sheet;

[0027] At least one end of the spring is mounted on its corresponding sealing plate or end plate.

[0028] Furthermore, the travel range of the sealing plate is 1.5-4mm.

[0029] Furthermore, a support plate is provided on the inner side of the sealing plate, and a plurality of exhaust windows are provided on the support plate;

[0030] Under normal conditions, the sealing plate is attached to the outer surface of the support plate, and the support plate plays a supporting and limiting role for the sealing plate. In this state, the sealing plate can isolate the space where the battery cell assembly is located (i.e. the inner part of the support plate) from the exhaust cavity to a certain extent, but it is not completely isolated. Gas can still pass through the gap between the sealing plate and the support plate.

[0031] When the air pressure inside the cavity where the battery cell assembly is located increases, the sealing plate overcomes the thrust of the elastic element and moves toward the side where the exhaust cavity is located, so as to widen the gap between the sealing plate and the support plate to form a smooth exhaust passage. At this time, the gas in the cavity where the battery cell assembly is located enters the exhaust cavity and is quickly discharged from the exhaust port to the outside of the battery casing.

[0032] The inner surface of the support plate is provided with several reinforcing ribs.

[0033] Furthermore, the top and bottom of the battery cell assembly are respectively provided with exhaust channels.

[0034] Furthermore, a waterproof plug is installed on the exhaust port. When the air pressure inside the cavity where the battery cell assembly is located increases, the waterproof plug moves outward to detach from the exhaust port.

[0035] Furthermore, a connector box is installed on the outside of the end plate without a sealing plate, and a lithium battery plug is installed inside the connector box.

[0036] Furthermore, the charging interface of the lithium battery plug is located at the end of the explosion-proof battery, and the discharging interface is located at the bottom of the explosion-proof battery.

[0037] The end plate at the end where the connector box is located is provided with a wire hole, and the power cord of the lithium battery plug is connected to the battery cell assembly through the wire hole.

[0038] Furthermore, the connector box is provided with a locking protrusion that can extend from the top of the explosion-proof battery, the locking protrusion is provided with a lever that extends into the connector box, and the top of the locking protrusion is provided with a locking spring.

[0039] Furthermore, the battery casing is made of metal sheet material.

[0040] Preferably, the battery casing is made of aluminum alloy plate, which is lightweight and has high strength.

[0041] Furthermore, the explosion-proof battery for electric vehicles is used in electric golf bag carts.

[0042] Secondly, based on the aforementioned explosion-proof battery for electric vehicles, this utility model also provides an electric golf bag cart, which uses the aforementioned explosion-proof battery for electric vehicles.

[0043] After adopting the above technical solution, the beneficial effects of this utility model are as follows:

[0044] This invention features an exhaust port on the battery casing, which works in conjunction with a sealing plate inside the battery casing. When thermal runaway occurs in the battery cell assembly, the gas pressure inside the cavity containing the battery cell assembly increases. The gas pushes the sealing plate to move, connecting the cavity containing the battery cell assembly with the exhaust port. This allows the gas generated by the explosion to be discharged from the exhaust port to the outside of the battery casing, thereby confining the combustion and explosion of the battery cell assembly inside the battery casing, preventing explosives from splashing out, avoiding fires, and improving safety performance. Attached Figure Description

[0045] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0046] Figure 1 This is a structural diagram of the explosion-proof battery for electric vehicles according to Embodiment 1 of this utility model;

[0047] Figure 2 This is a structural diagram of the explosion-proof battery for electric vehicles according to Embodiment 1 of this utility model;

[0048] Figure 3 This is a cross-sectional view of the explosion-proof battery for electric vehicles according to Embodiment 1 of this utility model;

[0049] Figure 4 yes Figure 3 Enlarged view of section A;

[0050] Figure 5 This is an exploded view of one end (the end with the sealing plate) of the explosion-proof battery casing of the electric vehicle explosion-proof battery of Embodiment 1 of this utility model.

[0051] Figure 6This is an exploded view of the other end of the explosion-proof battery casing of the electric vehicle explosion-proof battery according to Embodiment 1 of this utility model.

[0052] In the diagram: Battery casing 1, outer shell 1-1, end plate 1-2, cell assembly 2, sealing plate 3, vent 4, vent hole 5, vent cavity 6, sealing screw 7, spring 8, protrusion 9, through hole 10, frustum 11, support plate 12, vent window 13, groove 14, reinforcing rib 15, vent channel 16, waterproof plug 17, connector box 18, lithium battery plug 19, screw 20, charging port 21, discharging port 22, wire hole 23, locking protrusion 24, toggle plate 25, locking spring 26. Detailed Implementation

[0053] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0054] 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 to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0055] Example 1

[0056] In this embodiment, the explosion-proof battery for electric vehicles is applied to various types of electric golf bag carts.

[0057] like Figure 1-6 As shown, an explosion-proof battery for electric vehicles includes a battery housing 1, a cell assembly 2, and a sealing plate 3. The cell assembly 2 is installed inside the battery housing 1. At least one sealing plate is provided, and each sealing plate 3 has at least one exhaust port 4 on the side opposite to the cavity where the cell assembly 2 is located. When the gas pressure inside the cavity where the cell assembly 2 is located increases, the sealing plate 3 moves toward the side where the exhaust port 4 is located, so that the gas inside the cavity where the cell assembly 2 is located is discharged to the outside of the battery housing 1 through the exhaust port 4. When the gas pressure inside the cavity where the cell assembly 2 is located decreases, the sealing plate 3 moves toward the side where the cell assembly 2 is located until the cavity where the cell assembly 2 is located is separated from the exhaust port 4.

[0058] The battery housing 1 includes a cylindrical outer shell 1-1 and end plates 1-2 disposed at both ends of the outer shell 1-1. The sealing plate 3 is located inside the end plate 1-2, and an exhaust cavity 6 is provided between the sealing plate 3 and the end plate 1-2.

[0059] Since the explosion-proof battery in this embodiment has a small capacity, one sealing plate 3 is sufficient to achieve the effect of quickly venting the gas inside the battery casing 1. Therefore, in this embodiment, one sealing plate 3 is provided and is located inside one of the end plates. Correspondingly, the exhaust port 4 is located on the battery casing 1 outside the sealing plate 3.

[0060] When the air pressure inside the cavity where the battery cell assembly 2 is located increases, the exhaust cavity 6 can provide space for the movement of the sealing plate 3.

[0061] The battery casing 1 can be an integral structure, that is, the cylindrical outer shell 1-1 and the end plates 1-2 at both ends are integrally formed, or it can be a split structure, that is, the cylindrical outer shell 1-1 and the end plates 1-2 at both ends are connected by welding or bolts. This embodiment adopts a split structure, which is more convenient to process.

[0062] Specifically, to ensure the waterproof performance of the explosion-proof battery, a sealed fit is required between the outer casing 1-1 and the end plate 1-2. In this embodiment, the outer casing 1-1 is a rectangular column structure with openings at both ends, and the end plate 1-2 is a groove-shaped structure with an opening on one side. During assembly, the end plate 1-2 is installed to the end opening of the outer casing 1-1 with the opening facing inward. Then, the sealing screw 20 and the sealing screw 207 are used to pass through the outer casing 1-1 and connect to the side wall of the end plate 1-2. If necessary, waterproof sealant can be applied to the mating area between the end plate 1-2 and the outer casing 1-1 to ensure the waterproof sealing performance of the explosion-proof battery.

[0063] The exhaust port 4 is located on the outer wall of the exhaust cavity 6.

[0064] Preferably, the exhaust port 4 is disposed on the outer casing 1-1.

[0065] Vent holes 5 are provided on the side walls of the end plate 1-2 at the end where the sealing plate 3 is located, which are opposite to the exhaust port 4, so as to ensure that the gas entering the exhaust cavity 6 from the space where the cell assembly 2 is located can be discharged to the outside of the battery casing 1 through the exhaust port 4.

[0066] To ensure efficient gas venting from the explosion-proof battery, the area of ​​the vent 4 on the explosion-proof battery must be no less than 100 mm². 2 It can be set as one exhaust port 4, or it can be set as two or more exhaust ports 4. In this embodiment, it is set as a rectangular exhaust port 4.

[0067] Under normal circumstances, the exhaust cavity 6 corresponding to the exhaust port 4 and the cavity where the battery cell assembly 2 is located are located on both sides of the sealing plate 3, and the sealing plate 3 can separate these two spaces to a certain extent. When the gas pressure in the cavity where the battery cell assembly 2 is located increases, the sealing plate 3 moves toward the side where the exhaust cavity 6 is located. At this time, the exhaust cavity 6 and even the exhaust port 4 will be located on the same side of the sealing plate 3 as the cavity where the battery cell assembly 2 is located. The exhaust port 4 can then quickly discharge the gas in the cavity where the battery cell assembly 2 is located to the outside of the battery casing 1.

[0068] An elastic element is provided between the sealing plate 3 and the end plate 1-2 at its end.

[0069] The elastic element provides an initial thrust to the sealing plate 3 to separate the exhaust cavity 6 from the cavity where the battery cell assembly 2 is located. Secondly, when the explosion of the battery cell assembly 2 ends or during the explosion interval, the air pressure in the cavity where the battery cell assembly 2 is located drops, and the sealing plate 3 will move towards the cavity where the battery cell assembly 2 is located under the action of the elastic element until it is completely reset (that is, the sealing plate 3 separates the exhaust cavity 6 from the cavity where the battery cell assembly 2 is located again), to prevent external air from entering the cavity where the battery cell assembly 2 is located and causing a fire.

[0070] In this embodiment, the elastic element is a spring 8.

[0071] Specifically, four springs 8 are provided, which are located near the four corners of the sealing plate 3 and arranged symmetrically. This ensures the stability of the sealing plate 3 when it moves and avoids the problem of displacement.

[0072] The spring force of a single spring is 9N, and the spring force of four springs 8 when compressed is 30-40N. That is, when the air pressure in the cavity where the battery cell assembly 2 is located is greater than the corresponding spring force, the sealing plate 3 can be pushed to move toward the side where the discharge cavity 6 is located, so as to discharge the gas in the cavity where the battery cell assembly 2 is located from the exhaust port 4.

[0073] In order to position the spring 8, the spring 8 is mounted on the corresponding sealing plate 3 and / or end plate 1-2.

[0074] Specifically, a protruding post 9 is provided on the inner wall of the end plate 1-2 at the end where the sealing plate 3 is located, and a through hole 10 is provided on the sealing plate 3 to accommodate the protruding post 9. The spring 8 is sleeved on the protruding post 9.

[0075] The engagement of the protrusion 9 and the through hole 10 can guide the movement of the sealing plate 3, and the protrusion 9 can also facilitate the assembly of the spring 8.

[0076] Preferably, the end of the protrusion 9 facing the sealing plate 3 is provided with a truncated cone 11 with a slightly larger outer diameter. The spring 8 is assembled on the outside of the truncated cone 11. This can position the spring 8 and prevent it from moving arbitrarily in the radial direction. At the same time, the truncated cone 11 can also limit the movement of the sealing plate 3 towards the end plate 1-2. That is, when the sealing plate 3 is attached to the truncated cone 11, it cannot continue to move towards the side where the end plate 1-2 is located.

[0077] The travel range of the sealing plate 3 is 1.5-4mm.

[0078] A support plate 12 is provided on the inner side of the sealing plate 3, and a plurality of exhaust windows 13 are provided on the support plate 12.

[0079] The support plate 12 can support and limit the inner side of the sealing plate 3, and the exhaust window 13 can ensure that the gas in the cavity where the cell assembly 2 is located can be smoothly discharged to the outside of the battery casing 1.

[0080] Specifically, under normal conditions, the sealing plate 3 is attached to the outer surface of the support plate 12, and the support plate 12 plays a supporting and limiting role for the sealing plate 3. In this state, the sealing plate 3 can isolate the space where the battery cell assembly 2 is located (i.e. the inner part of the support plate 12) from the exhaust cavity 6 to a certain extent, but it is not completely isolated. Gas can still pass through the gap between the sealing plate 3 and the support plate 12.

[0081] When the air pressure inside the cavity where the cell assembly 2 is located increases, the sealing plate 3 overcomes the thrust of the elastic element and moves toward the side where the exhaust cavity 6 is located, so as to expand the gap between the sealing plate 3 and the support plate 12 to form a smooth exhaust passage. At this time, the gas in the cavity where the cell assembly 2 is located enters the exhaust cavity 6 and is quickly discharged from the exhaust port 4 to the outside of the battery casing 1.

[0082] In this embodiment, the support plate 12 is mounted on the end plate 1-2 at its end. That is, the inner side of the side plate of the end plate 1-2 is provided with a groove 14, and the support plate 12 is placed in the groove 14 and connected to the end plate 1-2 by bolts.

[0083] To ensure the structural strength of the support plate 12, a number of reinforcing ribs 15 are provided on the inner surface of the support plate 12.

[0084] In order to improve the exhaust efficiency of the cavity where the battery cell assembly 2 is located, exhaust channels 16 are provided at the top and bottom of the battery cell assembly 2 respectively.

[0085] The cell assembly 2 includes a cell support and a number of cells mounted on the cell support.

[0086] Preferably, the height of the exhaust passage 16 is not less than 3mm.

[0087] A waterproof plug 17 is installed on the exhaust port 4. When the air pressure inside the cavity where the battery cell assembly 2 is located increases, the waterproof plug 17 moves outward to detach from the exhaust port 4.

[0088] The waterproof plug 17 is designed to ensure the waterproof performance of the explosion-proof battery.

[0089] Specifically, the waterproof plug 17 is fixed to the outer casing 1-1 with glue, which, after curing, provides a sealing and waterproof function. When the air pressure in the cavity where the battery cell assembly 2 is located increases, the air pressure will push the waterproof plug 17 out of the vent 4, thereby venting the gas from the vent 4 to the outside of the battery casing 1.

[0090] The pressure value of the waterproof plug 17 being pushed out should not be greater than the pressure value of the sealing plate 3 being pushed out. The waterproof plug 17 only serves a waterproof function, and the lower the pressure value of pushing it out, the better.

[0091] The vent 4 can be located on any side of the outer casing 1-1. Preferably, the vent 4 is located at the bottom. When the explosion-proof battery is placed in the battery compartment of the electric golf bag cart, the vent 4 faces downward. The bottom of the battery compartment is provided with a vent hole corresponding to the vent 4, which facilitates the detachment of the waterproof plug 17 and the discharge of gas. The gas is discharged downward, which can avoid injury to personnel.

[0092] To facilitate the connection of the explosion-proof battery to the electric golf bag cart and external power source, a connector box 18 is installed on the outside of the end plate 1-2 without the sealing plate 3, and a lithium battery plug 19 is provided inside the connector box 18.

[0093] In this embodiment, the junction box 18 is connected to the end plate 1-2 at its location by screws 20.

[0094] Specifically, the charging interface 21 of the lithium battery plug 19 is located at the end of the explosion-proof battery, and the discharging interface 22 is located at the bottom of the explosion-proof battery.

[0095] The junction box 18 is provided with windows corresponding to the charging interface 21 and the discharging interface 22, respectively.

[0096] The charging port 21 is used to connect to an external power source, and the discharging port 22 is used to connect to an electric vehicle such as an electric golf bag cart.

[0097] The end plate 1-2 at the end of the connector box 18 is provided with a wire hole 23, and the power cord of the lithium battery plug 19 is connected to the battery cell assembly 2 through the wire hole 23.

[0098] In this embodiment, the wire hole 23 is located at the top of the corresponding end plate 1-2.

[0099] To facilitate the installation of the explosion-proof battery, the connector box 18 is provided with a locking protrusion 24 that can extend from the top of the explosion-proof battery. The locking protrusion 24 is provided with a lever 25 that extends into the connector box 18, and a locking spring 26 is provided on the top of the locking protrusion 24.

[0100] Preferably, the inner surface of the locking protrusion 24 is a sloped surface that is higher on the inside and lower on the outside.

[0101] When installing the explosion-proof battery of this embodiment on the corresponding electric golf bag vehicle, the explosion-proof battery is inserted into the battery compartment inside the vehicle body from the rear side of the golf bag vehicle body. During the insertion process, the locking protrusion 24 will move downward and compress the locking spring 26 due to the inclined surface design, and then retract into the connector box 18. After the explosion-proof battery is installed in the battery compartment, the locking protrusion 24 extends upward and resets under the action of the locking spring 26, and cooperates in the locking groove at the bottom of the battery compartment that cooperates with the locking protrusion 24. At this time, the explosion-proof battery can be firmly assembled.

[0102] When it is necessary to remove the explosion-proof battery, the lever 25 can be pushed down. The lever 25 causes the locking protrusion 24 to move down and compress the locking spring 26. At this time, the locking protrusion 24 can be disengaged from the locking groove, and then the explosion-proof battery can be pulled out from the battery compartment. The operation is convenient and simple.

[0103] To ensure the explosion-proof performance of the battery casing 1, the battery casing 1 is made of metal sheet material.

[0104] Preferably, the battery casing 1 is made of aluminum alloy plate, which is lightweight and has high strength.

[0105] The explosion-proof battery for electric vehicles is used in electric golf bag carts.

[0106] When the explosion-proof battery of this embodiment is applied to an electric golf bag cart, its exhaust port 4 faces downwards, so that high-temperature gas can be discharged downwards during exhaust and depressurization, avoiding damage to other parts of the electric golf bag cart.

[0107] If thermal runaway occurs during the use of the explosion-proof battery, the air pressure in the cavity containing the cell assembly 2 inside the battery casing 1 will rise instantly. The air pressure will push the sealing plate 3 toward the side where the exhaust cavity 6 is located and compress the spring 8. At this time, the spring 8 will act as a buffer for the sealing plate 3, thereby connecting the cavity containing the cell assembly 2 with the exhaust port 4. After the gas pushes out the waterproof plug 17, it can be discharged to the outside of the battery casing 1 through the exhaust port 4. This can effectively prevent explosives from splashing randomly, prevent fires, and improve the safety of the battery and the electric golf cart.

[0108] Secondly, based on the aforementioned explosion-proof battery for electric vehicles, this utility model also provides an electric golf bag cart, which uses the aforementioned explosion-proof battery for electric vehicles.

[0109] Example 2

[0110] Based on Example 1, this example also provides an explosion-proof battery for electric vehicles, whose structure is largely the same as that of Example 1, except that:

[0111] There are two sealing plates 3, which are located inside the two end plates 1-2 respectively.

[0112] The arrangement of structures such as the sealing plate 3, exhaust port 4, exhaust cavity 6, support plate 12, and spring 8 at the end without the lithium battery plug 19 can all refer to Embodiment 1.

[0113] The sealing plate 3, located at the same end as the lithium battery plug 19, is also similar to that in Embodiment 1, and the specific method is as follows:

[0114] The sealing plate 3 is located inside the end plate 1-2, and an exhaust cavity 6 is also provided between the sealing plate 3 and the end plate 1-2. A spring 8 is installed in the exhaust cavity 6 and mounted on the inner wall of the end plate 1-2. The exhaust port 4 is located on the outer shell at the bottom of the exhaust cavity 6. A support plate 12 is installed on the end plate 1-2 inside the sealing plate 3, and an exhaust window 13 is provided on the support plate 12.

[0115] Since the end plate 1-2 has a wire-passing hole 23 on its top, the sealing plate 3 can avoid the wire-passing hole 23, meaning its top does not need to be positioned at the wire-passing hole 23. However, the sealing plate 3 must be able to completely cover the vent window 13 on the support plate 12. The top of the support plate 12 also needs to have a hole corresponding to the wire-passing hole 23 that can accommodate the power cable.

[0116] When the explosion-proof battery experiences thermal runaway, the air pressure in the cavity where the cell assembly is located increases, which simultaneously pushes the sealing plates 3 at both ends to move in opposite directions (towards the corresponding end plates 1-2), thereby causing the gas to be discharged from the exhaust ports 4 at both ends of the battery casing 1.

[0117] Example 3

[0118] Based on Example 1, this example also provides an explosion-proof battery for electric vehicles, whose structure is largely the same as that of Example 1, except that:

[0119] The elastic element is a spring sheet.

[0120] At least one end of the spring is mounted on the corresponding sealing plate 3 or end plate 1-2.

[0121] In this embodiment, the two ends of the spring are respectively connected to the outer wall of the sealing plate 3 and the inner wall of the corresponding end plate 1-2.

[0122] The spring can be selected, but is not limited to, V-shaped or Z-shaped springs, and its two ends can be connected to the sealing plate 3 and the end plate 1-2 respectively by welding or screw connection.

[0123] In this embodiment, four spring clips are arranged, each located near one of the four corners of the sealing plate 3. This arrangement of the spring clips ensures the stability of the sealing plate 3 during movement and avoids any displacement issues.

[0124] Example 4

[0125] This embodiment provides an electric golf bag cart, which uses the explosion-proof battery for electric vehicles disclosed in the above embodiment.

[0126] This explosion-proof battery for electric vehicles can be used in various types of electric vehicles, such as electric bicycles, electric motorcycles, electric tricycles, electric mobility scooters, electric golf carts, and electric golf bag carts. Regardless of its shape or specifications, this explosion-proof battery for electric vehicles is within the scope of the explosion-proof batteries protected by this utility model.

[0127] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. An explosion-proof battery for electric vehicles, characterized in that, include Battery casing (1), inside which a battery cell assembly (2) is installed; A sealing plate (3) is provided, and each sealing plate (3) is provided with at least one exhaust port (4) on the side opposite to the cavity where the cell assembly (2) is located; When the gas pressure inside the cavity where the cell assembly (2) is located increases, the sealing plate (3) moves toward the side where the exhaust port (4) is located, so that the gas inside the cavity where the cell assembly (2) is located is discharged to the outside of the battery casing (1) through the exhaust port (4); When the air pressure inside the cavity where the battery cell assembly (2) is located decreases, the sealing plate (3) moves toward the side where the battery cell assembly (2) is located until the cavity where the battery cell assembly (2) is located is separated from the exhaust port (4).

2. The explosion-proof battery for electric vehicles according to claim 1, characterized in that, The battery housing (1) includes a cylindrical outer shell (1-1) and end plates (1-2) disposed at both ends of the outer shell (1-1). The sealing plate (3) is located inside the end plate (1-2), and an exhaust cavity (6) is provided between the sealing plate (3) and the end plate (1-2) where it is located.

3. The explosion-proof battery for electric vehicles according to claim 2, characterized in that, The exhaust port (4) is located on the outer wall of the exhaust cavity (6).

4. The explosion-proof battery for electric vehicles according to claim 3, characterized in that, The exhaust port (4) is located on the outer casing (1-1).

5. The explosion-proof battery for electric vehicles according to claim 2, characterized in that, An elastic element is provided between the sealing plate (3) and the end plate (1-2) at its end.

6. The explosion-proof battery for electric vehicles according to claim 5, characterized in that, The elastic element is a spring (8); The spring (8) is mounted on its corresponding sealing plate (3) and / or end plate (1-2).

7. The explosion-proof battery for electric vehicles according to claim 6, characterized in that, A protruding post (9) is provided on the inner wall of the end plate (1-2) at the end where the sealing plate (3) is located. The sealing plate (3) is provided with a through hole to accommodate the protruding post (9) passing through. The spring (8) is sleeved on the protruding post (9).

8. The explosion-proof battery for electric vehicles according to claim 5, characterized in that, The elastic element is a spring sheet; At least one end of the spring is mounted on the corresponding sealing plate (3) or end plate (1-2).

9. The explosion-proof battery for electric vehicles according to claim 1, characterized in that, The travel range of the sealing plate (3) is 1.5-4mm.

10. The explosion-proof battery for electric vehicles according to claim 2, characterized in that, A support plate (12) is provided on the inner side of the sealing plate (3), and a plurality of exhaust windows (13) are provided on the support plate (12); The inner surface of the support plate (12) is provided with several reinforcing ribs (15).

11. The explosion-proof battery for electric vehicles according to claim 1, characterized in that, The top and bottom of the battery cell assembly (2) are respectively provided with exhaust channels (16).

12. The explosion-proof battery for electric vehicles according to claim 1, characterized in that, A waterproof plug (17) is installed on the exhaust port (4). When the air pressure in the cavity where the battery cell assembly (2) is located increases, the waterproof plug (17) moves outward to detach from the exhaust port (4).

13. The explosion-proof battery for electric vehicles according to claim 2, characterized in that, A connector box (18) is installed on the outside of the end plate (1-2) without the sealing plate (3), and a lithium battery plug (19) is provided inside the connector box (18).

14. The explosion-proof battery for electric vehicles according to claim 13, characterized in that, The charging interface (21) of the lithium battery plug (19) is located at the end of the explosion-proof battery, and the discharging interface (22) is located at the bottom of the explosion-proof battery. The end plate (1-2) at the end of the connector box (18) is provided with a wire hole (23), and the power line of the lithium battery plug (19) is connected to the battery cell assembly (2) through the wire hole (23).

15. The explosion-proof battery for electric vehicles according to claim 13, characterized in that, The connector box (18) is provided with a locking protrusion (24) that can extend from the top of the explosion-proof battery. The locking protrusion (24) is provided with a lever (25) that extends into the connector box (18). The top of the locking protrusion (24) is provided with a locking spring (26).

16. The explosion-proof battery for electric vehicles according to claim 1, characterized in that, The battery casing (1) is made of metal sheet.

17. The explosion-proof battery for electric vehicles according to claim 1, characterized in that, The explosion-proof battery for electric vehicles is used in electric golf bag carts.

18. An electric golf bag cart, characterized in that, It uses the explosion-proof battery for electric vehicles as described in any one of claims 1-17.

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