Lithium battery pack for electric vehicle

Abstract

The lithium battery pack for the electric vehicle comprises a first protective frame and a cover plate, the cover plate is a metal plate, bolts are arranged on the cover plate, threaded holes matched with the bolts are formed in the first protective frame, the cover plate is connected to the first protective frame in a sealed mode through the bolts, and the first protective frame is connected with the cover plate in a sealed mode. A lower baffle is fixedly connected to the inner wall of the first protection frame, a through hole is formed in the lower baffle, a fixing assembly is fixedly connected to the inner wall of the first protection frame, the fixing assembly is used for fixing a lithium battery in the first protection frame, and the fixing assembly comprises a plurality of first fixing boxes; the first fixing box is fixedly connected to the inner wall of the first protection frame. Compared with the prior art, the lithium battery pack for the electric vehicle has the advantages that flames can be sprayed to the ground under the condition of spontaneous combustion of the lithium battery, the speed of swallowing the whole vehicle by a fire disaster can be effectively delayed, and more precious escape time is won for a driver.

Description

Technical Field

[0001] This utility model belongs to the field of lithium battery pack technology, specifically relating to a lithium battery pack for electric vehicles. Background Technology

[0002] In recent years, the popularity of electric vehicles has increased rapidly, but this has also brought about increasingly prominent safety hazards. Data shows that since 2018, the number of electric vehicle fires has been increasing by about 20% annually, with lithium battery-related accidents accounting for over 60%. Once a lithium battery starts to burn uncontrollably, the temperature can quickly rise to 1000℃, and it will burn violently within a short period. Furthermore, experiments have shown that traditional fire extinguishing methods such as water, dry powder extinguishers, and sand covering are ineffective in extinguishing lithium battery fires.

[0003] Lithium battery fires are characterized by flames that typically shoot upwards and spread extremely quickly. Once a fire breaks out, the lives of drivers are immediately and seriously threatened.

[0004] Therefore, in order to address the aforementioned technical problems, it is necessary to provide a lithium battery pack for electric vehicles.

[0005] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0006] The purpose of this invention is to provide a lithium battery pack for electric vehicles that can direct flames toward the ground in the event of spontaneous combustion of the lithium battery, effectively slowing down the rate at which the vehicle is engulfed by fire and giving the driver more precious escape time.

[0007] To achieve the above objectives, a specific embodiment of this utility model provides a lithium battery pack for electric vehicles, including a first protective frame and a cover plate. The cover plate is a metal plate with bolts. The first protective frame has threaded holes that match the bolts. The cover plate is sealed to the first protective frame by bolts. A lower baffle is fixedly connected to the inner wall of the first protective frame, and a through hole is provided on the lower baffle. A fixing component is fixedly connected to the inner wall of the first protective frame, and the fixing component is used to fix the lithium battery inside the first protective frame.

[0008] In one or more embodiments of the present invention, the fixing component includes a plurality of first fixing boxes, which are fixedly connected to the inner wall of the first protective frame.

[0009] In one or more embodiments of this utility model, there is a gap between the plurality of first fixing boxes, and the lower end face of the first fixing box and the baffle do not contact each other.

[0010] In one or more embodiments of the present invention, the fixing component further includes a second fixing box that matches the first fixing box, the second fixing box being fixedly connected to the cover plate.

[0011] In one or more embodiments of this utility model, a plug plate is fixedly connected to the second fixing box, and a slot matching the plug plate is provided on the first fixing box.

[0012] In one or more embodiments of the present invention, the first fixing box has a first opening, and the second fixing box has a second opening that matches the first opening.

[0013] In one or more embodiments of this utility model, a heat-melting part is sealed inside the through hole on the lower baffle.

[0014] In one or more embodiments of this utility model, the hot melt part is a hot melt adhesive block.

[0015] In one or more embodiments of this utility model, a second protective frame is adhered to the lower baffle, and a protective film is sealed inside the second protective frame.

[0016] In one or more embodiments of this utility model, a busbar is installed on the side wall of the first protective frame, a power line connected to the busbar is installed on the first protective frame, and an electrical connection block is installed at the end of the power line away from the busbar.

[0017] Compared with existing technologies, the lithium battery pack for electric vehicles of this invention can direct the flames toward the ground in the event of spontaneous combustion of the lithium battery, which can effectively slow down the speed at which the entire vehicle is engulfed by fire and give the driver more precious escape time. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of a lithium battery pack for electric vehicles according to one embodiment of the present invention. Figure 1 ;

[0020] Figure 2 This is a schematic diagram of the structure of a lithium battery pack for electric vehicles according to one embodiment of the present invention. Figure 2 ;

[0021] Figure 3 This is a cross-sectional view of a lithium battery pack for an electric vehicle according to one embodiment of the present invention;

[0022] Figure 4 This is a schematic diagram of the structure of a fixing component for a lithium battery pack for an electric vehicle in one embodiment of the present invention;

[0023] Figure 5 This is a schematic diagram of the structure of a lower baffle for a lithium battery pack used in an electric vehicle, according to one embodiment of the present invention.

[0024] Explanation of key figure labels:

[0025] 1. First protective frame; 11. Lower baffle; 111. Heat-melting part; 112. Second protective frame; 1121. Protective film; 12. First fixing box; 121. First opening; 122. Slot; 2. Cover plate; 21. Bolt; 22. Second fixing box; 221. Second opening; 222. Insert plate; 3. Power cord; 31. Electrical connection block. Detailed Implementation

[0026] To enable those skilled in the art to better understand the technical solutions of this utility model, 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, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0027] like Figures 1 to 5 As shown, an embodiment of this utility model discloses a lithium battery pack for electric vehicles, comprising a first protective frame 1 and a cover plate 2, the cover plate 2 being a metal plate. The cover plate 2 is provided with bolts 21, and the first protective frame 1 has threaded holes matching the bolts 21. The cover plate 2 is sealed to the first protective frame 1 by the bolts 21. Specifically, multiple sets of lithium batteries are arranged, each set placed inside the first protective frame 1, and then the lithium batteries are fixed inside the first protective frame 1. Closing the cover plate 2 completes the assembly of the lithium battery pack.

[0028] In the event of a lithium battery spontaneously combusting, to increase the driver's escape time and ensure their safety, a lower baffle 11 is integrally formed on the inner wall of the first protective frame 1, with through holes on the lower baffle 11. Specifically, when a lithium battery spontaneously combusts, the flames are blocked by the cover plate 2, and due to the increased air pressure inside the first protective frame 1, they are ejected downwards through the through holes in the lower baffle 11. The flames ejected from the through holes in the lower baffle 11 will land on the ground. The vehicle chassis is typically made of metal, which can block the flames for a certain period, thus buying the driver more escape time.

[0029] Because the lower baffle 11 has a through hole, a heat-fused part 111 is used to seal the through hole to prevent dirt from entering the first protective frame 1 when the electric vehicle is driving or parked. The heat-fused part 111 seals the through hole on the lower baffle 11, preventing dust or other dirt in the air from entering the first protective frame 1, thus providing a good working environment for the lithium battery inside the first protective frame 1 and extending the battery's lifespan.

[0030] It is worth noting that the hot-melt part 111 must be able to melt rapidly at high temperatures and must not affect the flame from being discharged through the through hole on the lower baffle 11. Preferably, the hot-melt part 111 is a hot-melt adhesive block.

[0031] Specifically, the hot melt adhesive block is a solidified hot melt adhesive that begins to soften at around 90°C and completely melts at around 120°C. When an electric vehicle is in motion, the operating temperature of the lithium battery does not exceed 60°C. For example, ternary lithium batteries and lithium iron phosphate batteries have a normal operating temperature range between 20 and 50°C. At this temperature, the hot melt adhesive block will not melt. However, when the lithium battery abnormally heats up, the temperature will gradually rise, and the hot melt adhesive block will melt. When the lithium battery catches fire, the hot melt adhesive block will have completely melted, and flames will erupt from the through-hole on the lower baffle 11.

[0032] It is worth noting that although the temperature of a lithium battery increases, it does not necessarily lead to a fire. If the hot melt adhesive melts and the vehicle is driving on a wet surface, the water splashed onto the lithium battery may cause a short circuit.

[0033] Furthermore, a second protective frame 112 is adhered to the lower baffle 11, and a protective film 1121 is sealed inside the second protective frame 112. Specifically, when the hot melt adhesive block completely melts, the protective film 1121 does not melt, thus preventing water and dirt from entering the lower baffle 11. When the lithium battery catches fire, the flames spraying onto the protective film 1121 can instantly puncture and melt the protective film 1121, without obstructing the flames from escaping from the lower baffle 11.

[0034] Preferably, the protective film 1121 is a TPU hot melt adhesive film with a melting point between 125℃ and 145℃ and an operating temperature range of 145℃ to 170℃. It has excellent anti-aging properties, high tensile strength and good chemical corrosion resistance, and can remain stable in harsh environments.

[0035] like Figures 2 to 4 As shown, due to current battery technology limitations, lithium batteries are typically assembled from multiple units. To provide individual protection for each lithium battery, a fixing assembly is welded to the inner wall of the first protective frame 1. This fixing assembly includes multiple first fixing boxes 12, which are welded to the inner wall of the first protective frame 1. Gaps exist between the multiple first fixing boxes 12, and the lower end face of each first fixing box 12 does not contact the lower baffle 11.

[0036] Specifically, multiple first fixing boxes 12 are evenly suspended in the air. There is a 5-8cm air channel between the lower end face of the first fixing box 12 and the lower baffle 11. When the lithium battery in the first fixing box 12 spontaneously combusts, the flame can flow from the air channel between the first fixing box 12 and the lower baffle 11 to the lower baffle 11, and then be discharged from the through hole on the lower baffle 11.

[0037] To slow the spread of fire from one lithium battery to other lithium batteries within the first protective frame 1, the fixing assembly also includes a second fixing box 22 that matches the first fixing box 12. The second fixing box 22 is welded to the cover plate 2. When the cover plate 2 is closed on the first protective frame 1, the second fixing box 22 and the first fixing box 12 are aligned, thus providing individual protection for multiple lithium batteries.

[0038] Further, the first fixing box 12 has a first opening 121, and the second fixing box 22 has a second opening 221 that matches the first opening 121. In the event of a lithium battery fire, the flames escape through the first opening 121 and the second opening 221. This prevents excessive air pressure within the first fixing box 12 and the second fixing box 22 from causing an explosion.

[0039] When one of the lithium batteries in the first protective frame 1 catches fire, the flames ejected from the corresponding first opening 121 and second opening 221 will be blocked by the walls of the first fixing box 12 and the second fixing box 22 on the front side, and will not directly spray onto the lithium battery on the front side, thus slowing down the ignition speed of the lithium battery on the front side.

[0040] Furthermore, the second fixing box 22 is integrally formed with an insert plate 222, and the first fixing box 12 has a slot 122 that matches the insert plate 222. Specifically, when the cover plate 2 is closed on the first protective frame 1, the insert plate 222 is inserted into the slot 122, which enhances the sealing of the connection between the first fixing box 12 and the second fixing box 22.

[0041] likeFigure 2 As shown, a busbar (not shown) is installed on the side wall of the first protective frame 1. A power line 3 connected to the busbar is installed on the first protective frame 1, and an electrical connection block 31 is installed at the end of the power line 3 away from the busbar. The electrical connection block 31 enables the lithium battery pack for electric vehicles to supply power to the vehicle.

[0042] In use, if one or more lithium batteries in the lithium battery pack spontaneously combust, the heat-melting part 111 in the through hole of the lower baffle 11 will completely melt when it heats up abnormally. After the lithium battery catches fire, the flames will spray down to the lower baffle 11 from the first opening 121 and the second opening 221, and finally spray onto the ground from the through hole on the lower baffle 11. It will not spray directly into the vehicle, which can delay the time it takes for the vehicle to catch fire and provide the driver with valuable time to escape.

[0043] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0044] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A lithium battery pack for an electric vehicle, comprising a first protective frame and a cover plate, characterized in that, The cover plate is a metal plate, and a bolt is arranged on the cover plate; a threaded hole matched with the bolt is arranged on the first protective frame; the cover plate is sealingly connected to the first protective frame through the bolt; a lower baffle is fixedly connected to the inner wall of the first protective frame; a through hole is arranged on the lower baffle; a fixing assembly is fixedly connected to the inner wall of the first protective frame; and the fixing assembly is used for fixing the lithium battery in the first protective frame.

2. The lithium battery pack for electric vehicles according to claim 1, characterized in that, The fixing assembly comprises a plurality of first fixing boxes, and the first fixing boxes are fixedly connected to the inner wall of the first protective frame.

3. The lithium battery pack for electric vehicles according to claim 2, characterized in that, The first fixing boxes are spaced from each other, and the lower end surface of each first fixing box is not in contact with the baffle.

4. The lithium battery pack for electric vehicles according to claim 2, characterized in that, The fixing assembly further comprises a second fixing box matched with the first fixing box, and the second fixing box is fixedly connected to the cover plate.

5. The lithium battery pack for electric vehicles according to claim 4, characterized in that, A plug plate is fixedly connected to the second fixing box, and a plug groove matched with the plug plate is arranged on the first fixing box.

6. The lithium battery pack for electric vehicles according to claim 4, characterized in that, A first opening is arranged on the first fixing box, and a second opening matched with the first opening is arranged on the second fixing box.

7. The lithium battery pack for electric vehicles according to claim 1, characterized in that, The through hole in the lower baffle is sealed by a hot melt part.

8. The lithium battery pack for electric vehicles according to claim 7, characterized in that, The hot melt part is a hot melt glue block.

9. The lithium battery pack for electric vehicles according to claim 7, characterized in that, A second protective frame is bonded to the lower baffle, and a protective film is sealingly arranged in the second protective frame.

10. The lithium battery pack for electric vehicles according to any one of claims 1-9, characterized in that, A busbar is mounted on the side wall of the first protective frame, a power line in communication with the busbar is mounted on the first protective frame, and an electrically connected block is mounted on the end of the power line away from the busbar.

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