Battery pack and automobile

Abstract

The battery pack comprises at least one battery pack and a battery pack upper cover, each battery pack comprises a plurality of battery cells arranged side by side, an anti-explosion valve, a first electrode and a second electrode are arranged on the top surface of each battery cell, and the first electrode and the second electrode are located on the two sides of the anti-explosion valve; a first protection part is arranged at the top of each battery pack, each first protection part comprises a first convex structure and a second convex structure, and all first electrodes and second electrodes of the battery packs are accommodated in spaces formed between the first convex structures and the top surfaces of the battery packs as well as between the second convex structures and the top surfaces of the battery packs respectively; the battery pack upper cover comprises at least one third protruding structure, each third protruding structure is connected between the first protruding structure and the second protruding structure of the corresponding battery pack in a bridging mode, and all the anti-explosion valves are located in spaces formed by the third protruding structures and the top faces of the battery packs. And high-temperature flue gas sprayed by the explosion-proof valve is isolated when the battery pack is subjected to thermal runaway, so that potential safety hazards caused by the influence of the high-temperature flue gas on the battery cells are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a battery pack and a car with the battery pack. Background Art

[0002] With the development of new energy technologies, power battery technology has been particularly rapid. Battery packs convert power by transmitting electricity to electric motors. Compared to traditional fuel-powered engines, battery-driven electric motors offer high energy conversion efficiency, low noise, and reduced pollutant emissions. Furthermore, battery packs are widely used in automobiles, drones, robots, and other fields. Consequently, as a direct power source, battery pack safety has become a key concern, especially regarding thermal runaway accidents. Once thermal runaway occurs, it can easily lead to electrolyte leakage, battery pack fires, and other problems, posing a threat to the safety of equipment and passengers.

[0003] To improve battery safety during thermal runaway, Chinese patent publication number CN220324636U discloses a battery case and battery pack, comprising a case body and a separator. By disposing the separator within the case body and providing a thermal protection medium within the thermal protection structure, the separator divides the internal space of the case body into multiple accommodation spaces. In the event of thermal runaway of the battery module, the thermal protection medium is released into the accommodation spaces, where it can suppress thermal runaway. However, this does not address the issue of flue gas generated during thermal runaway and the secondary short circuit caused by the flue gas. Once a short circuit occurs, the current within the battery pack will increase significantly, resulting in excessive energy release and the generation of a large amount of heat. This will cause the battery pack temperature to rise, leading to serious accidents such as high temperatures, explosions, and fires.

[0004] Therefore, in the prior art, when a battery pack experiences thermal runaway, the thermal runaway generates high-temperature smoke and interacts with the battery cells, resulting in a significant safety hazard for the battery pack. Utility Model Content

[0005] The purpose of the present invention is to solve the problem in the prior art that when a battery pack experiences thermal runaway, high-temperature smoke is generated due to thermal runaway and the interaction between the smoke and the battery cells, resulting in a major safety hazard in the battery pack.

[0006] To solve the above technical problems, embodiments of the present invention disclose a battery pack comprising at least one battery pack and a battery pack cover, wherein each battery pack comprises a plurality of battery cells arranged side by side, and the top surface of each battery cell is provided with an explosion-proof valve and a first electrode and a second electrode located on either side of the explosion-proof valve; a first protective portion is provided on the top of each battery pack, and the battery pack cover is removably fixed to the top of the first protective portion; wherein the first protective portion comprises a first protrusion structure and a second protrusion structure, both of which extend along the arrangement direction of the battery cells of the battery pack and are removably provided on the top of the battery pack, and all the first electrodes of the battery pack are accommodated in the space formed between the first protrusion structure and the top surface of the battery pack, and all the second electrodes of the battery pack are accommodated in the space formed between the second protrusion structure and the top surface of the battery pack; and the battery pack cover comprises at least one third protrusion structure, each of which spans between the first protrusion structure and the second protrusion structure of a corresponding battery pack and extends along the arrangement direction of the battery cells of the battery pack, and all the explosion-proof valves of the battery pack are located in the space formed between the third protrusion structure and the top surface of the battery pack.

[0007] By adopting the above technical solution, all the first electrodes of the battery pack are accommodated in the space formed between the first protruding structure and the top surface of the battery pack, all the second electrodes of the battery pack are accommodated in the space formed between the second protruding structure and the top surface of the battery pack, and all the explosion-proof valves of the battery pack are located in the space formed between the third protruding structure and the top surface of the battery pack, so that the first protruding structure, the second protruding structure and the third protruding structure respectively isolate the first electrode, the second electrode and the explosion-proof valve, thereby avoiding the high-temperature flue gas ejected by the explosion-proof valve from affecting the battery pack cells when thermal runaway occurs in the battery pack, thereby improving the protection performance of the battery cells when thermal runaway occurs; the third protruding structure is connected across the first protruding structure and the second protruding structure of a corresponding battery pack, and the first protruding structure and the second protruding structure are both covered on the top of the battery pack, so that the battery cells can indirectly bear the force from the third protruding structure.

[0008] An embodiment of the present utility model also discloses a battery pack, wherein the first protective portion also includes a first connecting structure integrally formed with the first protruding structure, and a second connecting structure integrally formed with the second protruding structure, wherein the first connecting structure is arranged on both sides of the first protruding structure, and the first protruding structure is covered on the top of the battery pack through the first connecting structure; the second connecting structure is arranged on both sides of the second protruding structure, and the second protruding structure is covered on the top of the battery pack through the second connecting structure.

[0009] By adopting the above technical solution, the setting of the first connecting structure and the second connecting structure increases the connection area between the first protruding structure and the second protruding structure and the top of the battery pack, so that the first protruding structure and the second protruding structure of the first protective part are more firmly connected to the top surface of the battery pack through the first connecting structure and the second connecting structure, thereby avoiding falling off during thermal runaway.

[0010] An embodiment of the present invention also discloses a battery pack, in which the upper cover of the battery pack includes a plate-shaped cover body and at least one third protrusion structure protruding from the cover body toward away from the battery pack; wherein, the two sides of each third protrusion structure are respectively fitted with the top surfaces of the corresponding first protrusion structure and the second protrusion structure.

[0011] By adopting the above technical solution, the two sides of each third protrusion structure on the battery pack cover are respectively fitted with the top surfaces of the corresponding first protrusion structure and the second protrusion structure, so that the explosion-proof valve is located in the space formed by the third protrusion structure, the first protrusion structure, the second protrusion structure and the top surface of the battery pack, thereby isolating the high-temperature flue gas ejected by the explosion-proof valve when thermal runaway occurs, thereby enhancing the safety of the battery pack when thermal runaway occurs.

[0012] An embodiment of the present utility model further discloses a battery pack, which includes multiple battery packs arranged side by side in a vertical direction, and the vertical direction is perpendicular to the direction in which the battery cells of the battery pack are arranged; wherein the parts where the first protective parts of two adjacent battery packs are connected to each other form an integrated structure.

[0013] With the above technical solution, the connected parts of the first protection parts of two adjacent battery packs form an integrated structure, so that the first protection parts of the two adjacent battery packs simultaneously protect the first electrodes and the second electrodes of the two adjacent battery packs.

[0014] The embodiment of the present utility model further discloses a battery pack, wherein high temperature resistant glue is provided between the first connecting structure, the second connecting structure and the top surface of the battery pack; high temperature resistant glue is provided between the cover body and the first protrusion structure and the second protrusion structure.

[0015] By adopting the above technical solution and setting up the high-temperature resistant glue, when the battery pack is in a high-temperature environment due to thermal runaway, the connection reliability between the first connecting structure and the second connecting structure and the top surface of the battery pack, and between the cover body and the first protrusion structure and the second protrusion structure is guaranteed.

[0016] An embodiment of the present utility model further discloses a battery pack, wherein the first protective portion is made of a non-metallic high-temperature resistant composite material, and the battery pack cover is made of a high-strength metal material.

[0017] By adopting the above technical solution, the first protective part is made of a non-metallic high-temperature resistant composite material, so that the first protective part has the characteristics of preventing electrical leakage of the first electrode and the second electrode and being resistant to high temperatures; the battery pack cover is made of a high-strength metal material, so that the battery pack cover has a strong load-bearing capacity and high-temperature resistance.

[0018] An embodiment of the present utility model also discloses a battery pack, which also includes a battery pack tray. The battery pack tray includes side panels and a bottom plate. The side panels are along the circumference of the bottom plate and are perpendicular to the bottom plate. The side panels near the battery pack cover include a flange structure with threaded holes spaced apart.

[0019] An embodiment of the present utility model also discloses a battery pack, in which the upper cover of the battery pack is detachably connected to the side panel, and a connecting portion adapted to the flange structure is provided on the side of the upper cover of the battery pack close to the side panel, and a threaded hole corresponding to the threaded hole of the flange structure is provided on the connecting portion.

[0020] An embodiment of the present utility model also discloses a battery pack, in which at least one transverse reinforcing beam and / or at least one longitudinal reinforcing beam is provided on the top of the inner bottom plate of the battery pack tray, at least one transverse reinforcing beam is provided along the vertical direction of the battery pack, and at least one longitudinal reinforcing beam is provided along the arrangement direction of the battery cells in the battery pack.

[0021] With the above technical solution, at least one transverse reinforcement beam and / or longitudinal reinforcement beam is further provided in the battery pack tray to enhance the rigidity of the battery pack tray and increase the load-bearing capacity of the battery pack cover.

[0022] An embodiment of the present utility model further discloses a car, comprising a battery pack as described in any of the aforementioned embodiments.

[0023] The beneficial effects of the utility model are:

[0024] The utility model discloses a battery pack and a vehicle, wherein the battery pack comprises at least one battery group and a battery pack cover, each battery group comprises a plurality of battery cells arranged side by side, the top surface of each battery cell is provided with an explosion-proof valve and a first electrode and a second electrode located on both sides of the explosion-proof valve; a first protective portion is provided on the top of each battery pack, and the battery pack cover is detachably fixed to the top of the first protective portion; wherein the first protective portion comprises a first protruding structure and a second protruding structure, the first protruding structure and the second protruding structure both extend along the arrangement direction of the battery cells of the battery pack and are detachably covered on the top of the battery pack, and all the first electrodes of the battery pack are accommodated in the space formed between the first protruding structure and the top surface of the battery pack, and all the second electrodes of the battery pack are accommodated in the space formed between the second protruding structure and the top surface of the battery pack, so that when thermal runaway occurs in the battery pack, the first protruding structure and the second protruding structure isolate the first electrode from the second electrode, thereby avoiding the occurrence of thermal runaway. The high-temperature flue gas affects the battery pack cells, thereby improving the protection performance of the battery cells when thermal runaway occurs; and the battery pack cover includes at least one third protrusion structure, each third protrusion structure bridges between the first protrusion structure and the second protrusion structure of a corresponding battery pack and extends along the battery cell arrangement direction of the battery pack, and all explosion-proof valves of the battery pack are located in the space formed by the third protrusion structure and the top surface of the battery pack, so that when the battery pack has thermal runaway, the third protrusion structure isolates the high-temperature flue gas ejected by the explosion-proof valve, thereby further avoiding the high-temperature flue gas ejected by the explosion-proof valve when the battery pack has thermal runaway and affecting the battery pack cells, further improving the protection performance of the battery cells when thermal runaway occurs, the third protrusion structure bridges over the first protrusion structure and the second protrusion structure of a corresponding battery pack, and the first protrusion structure and the second protrusion structure are both covered on the top of the battery pack, so that the battery cells can indirectly bear the force from the third protrusion structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram of a battery pack explosion provided in an embodiment of the present utility model;

[0026] Figure 2 A schematic diagram of the components of a battery pack provided in an embodiment of the present invention;

[0027] Figure 3 A cross-sectional view of a battery pack provided in an embodiment of the present utility model;

[0028] Figure 4 This is an enlarged cross-sectional view of the battery pack provided in an embodiment of the present invention.

[0029] Description of reference numerals:

[0030] 100. Battery pack;

[0031] 110. Battery pack;

[0032] 111, battery cell;

[0033] 112. Explosion-proof valve; 113. First electrode; 114. Second electrode;

[0034] 120. Battery pack cover;

[0035] 121. Third protrusion structure; 122. Cover body; 123. Connecting portion;

[0036] 130, first protection unit;

[0037] 131. First protruding structure; 132. Second protruding structure; 133. First connecting structure; 134. Second connecting structure;

[0038] 140. Battery pack tray;

[0039] 141. Side plate; 142. Transverse reinforcement beam;

[0040] 1411. Flanged structure; 1412. Threaded hole;

[0041] A. Cell arrangement direction; B. Vertical direction. DETAILED DESCRIPTION

[0042] With the development of new energy technologies, battery packs are widely used as power sources. Consequently, battery pack safety issues have become a key concern for users and companies. Battery thermal runaway accidents are particularly serious. Once thermal runaway occurs, it can easily cause electrolyte leakage, battery pack fires, and battery cell short circuits, posing a threat to the safety of equipment and passengers. Therefore, battery pack safety during thermal runaway is of paramount importance.

[0043] The existing technology mainly provides safety protection for battery packs when thermal runaway occurs. When thermal runaway occurs, the high-temperature flue gas and electrolyte leaked from the battery pack are released into the storage space or guided for discharge. The high-temperature flue gas may contain various harmful chemicals, such as corrosive gases or toxic substances. After these substances come into contact with the battery cell electrodes, they may trigger chemical reactions, resulting in performance degradation or failure of the electrode material. However, these improvements do not disclose how to avoid the impact of high-temperature flue gas ejected from the explosion-proof valve on the battery cell when thermal runaway occurs, thereby causing the temperature of the battery cell to rise, and then causing serious accidents such as high temperature, explosion and fire.

[0044] To solve the above problems, the present invention discloses a battery pack 100, comprising at least one battery pack 110 and a battery pack cover 120, each battery pack 110 comprising a plurality of battery cells 111 arranged side by side, the top surface of each battery cell 111 being provided with an explosion-proof valve 112 and a first electrode 113 and a second electrode 114 located on both sides of the explosion-proof valve 112; a first protective portion 130 being provided on the top of each battery pack 110, the battery pack cover 120 being detachably fixed to the top of the first protective portion 130; wherein the first protective portion 130 comprises a first protruding structure 131 and a second protruding structure 132, both of which extend along the battery cell arrangement direction A of the battery pack 110 and are detachably fixed. The cover is disposed on the top of the battery pack 110, and all the first electrodes 113 of the battery pack 110 are accommodated in the space formed between the first protrusion structure 131 and the top surface of the battery pack 110, and all the second electrodes 114 of the battery pack 110 are accommodated in the space formed between the second protrusion structure 132 and the top surface of the battery pack 110; and the battery pack cover 120 includes at least one third protrusion structure 121, each third protrusion structure 121 spanning between the first protrusion structure 131 and the second protrusion structure 132 of a corresponding battery pack 110 and extending along the battery cell arrangement direction A of the battery pack 110, and all the explosion-proof valves 112 of the battery pack 110 are located in the space formed by the third protrusion structure 121 and the top surface of the battery pack 110.

[0045] In summary, the present invention accommodates all the first electrodes 113 of the battery pack 110 in the space formed between the first protruding structure 131 and the top surface of the battery pack 110, and accommodates all the second electrodes 114 of the battery pack 110 in the space formed between the second protruding structure 132 and the top surface of the battery pack 110, so that when the battery pack 100 has thermal runaway, the first protruding structure 131 and the second protruding structure 132 isolate the first electrode 113 and the second electrode 114, thereby preventing the high-temperature flue gas generated by the thermal runaway from polluting the battery cell 111 and affecting the battery cell 111. , thereby improving the protection performance of the battery cells 111 when thermal runaway occurs; all the explosion-proof valves 112 of the battery pack 110 are located in the space formed by the third protruding structure 121 and the top surface of the battery pack 110, so that when thermal runaway occurs in the battery pack 100, the third protruding structure 121 isolates and quickly discharges the high-temperature flue gas ejected by the explosion-proof valve 112, thereby further avoiding the high-temperature flue gas ejected by the explosion-proof valve 112 when thermal runaway occurs in the battery pack 100. The impact on the battery cells 111 of the battery pack 100 is further improved, and the protection performance of the battery cells 111 when thermal runaway occurs is further improved.

[0046] Furthermore, the third protrusion structure 121 is connected across the first protrusion structure 131 and the second protrusion structure 132 of the corresponding battery pack 110. The first protrusion structure 131 and the second protrusion structure 132 are both covered on the top of the battery pack 110, so that the battery cell 111 can indirectly bear the force from the third protrusion structure 121.

[0047] For details, see Figure 2 The first protruding structure 131 and the second protruding structure 132 both extend along the cell arrangement direction A of the battery pack 110, and the first protruding structure 131 and the second protruding structure 132 are respectively located on both sides of the explosion-proof valve 112, wherein the first protruding structure 131 is correspondingly arranged above the first electrode 113, and the protruding height of the first protruding structure 131 is higher than the height of the first electrode 113 protruding from the top surface of the battery pack 110, and the first electrode 113 is accommodated between the first protruding structure 131 and the top surface of the battery pack 110. The first electrode 113 is isolated from the explosion-proof valve 112 and the second electrode 114 by being housed in the space formed between the second protrusion structure 132 and the top surface of the battery pack 110. Similarly, the second protrusion structure 132 is correspondingly arranged above the second electrode 114, and the protrusion height of the second protrusion structure 132 is higher than the protrusion height of the second electrode 114 from the top surface of the battery pack 110. The second electrode 114 is accommodated in the space formed by the second protrusion structure 132 and the top surface of the battery pack 110, so that the second electrode 114 is isolated from the first electrode 113 and the explosion-proof valve 112.

[0048] Further, see Figure 1 The battery pack cover 120 includes at least one third protruding structure 121. One side of each third protruding structure 121 is connected to the top surface of the first protruding structure 131 of the corresponding battery pack 110, and the other side is connected to the top surface of the second protruding structure 132 of the corresponding battery pack 110. The third protruding structure 121 is connected to the top surface of the first protruding structure 131 and is connected to the top surface of the second protruding structure 132 after crossing the explosion-proof valve 112. That is, each third protruding structure 121 is connected across the corresponding The explosion-proof valve 112 is located between the first protrusion structure 131 and the second protrusion structure 132 of the battery pack 110 in the space formed by the first protrusion structure 131, the second protrusion structure 132, the third protrusion structure 121 and the top surface of the battery pack 110. The first protrusion structure 131, the second protrusion structure 132, the third protrusion structure 121 and the top surface of the battery pack 110 together form a smoke exhaust channel, so that the explosion-proof valve 112 is isolated from the first electrode 113 and the second electrode 114.

[0049] It should be noted that the first protruding structure 131 and the second protruding structure 132 can be detachably covered on the top of the battery pack 110 by gluing, so as to facilitate the inspection of the interior of the battery pack 100 or the disassembly of the battery pack 100; the first protruding structure 131 and the second protruding structure 132 can be made of metal materials or non-metallic materials with poor electrical conductivity. According to the specific thermal runaway protection requirements, the first protruding structure 131 and the second protruding structure 132 can be processed and manufactured by various processes such as injection molding, composite molding, composite extrusion, and blister molding; the third protruding structure 121 can be connected to the first protruding structure 131 and the second protruding structure 132 by welding or gluing; the protruding shapes of the first protruding structure 131, the second protruding structure 132 and the third protruding structure 121 can not only be as follows Figure 1 The rectangular or square protrusion in the figure can be adjusted to a semicircular, elliptical, etc. as needed according to the specific installation position and setting requirements by those skilled in the art, and this embodiment does not make a sole limitation on this; further, for the protrusion height of the third protrusion structure 121, those skilled in the art can set it according to the specific usage scenario and requirements, and this embodiment does not make a sole limitation on this.

[0050] More specifically, in order to achieve better thermal protection effect, high-temperature resistant glue can be applied on the inner side of the first protrusion structure 131, the second protrusion structure 132 and the third protrusion structure 121 facing the top surface of the battery pack 110, or a layer of high-temperature resistant material can be added, thereby further improving the thermal protection capability when thermal runaway occurs. Compared with applying high-temperature resistant glue or adding a layer of high-temperature resistant material on the entire battery pack cover 120 or on the top of the battery pack 110, this embodiment only applies high-temperature resistant glue or adds a layer of high-temperature resistant material on the inner side of the first protrusion structure 131, the second protrusion structure 132 and the third protrusion structure 121, which has the same thermal protection effect and lower cost.

[0051] With the above-mentioned arrangement, the first electrode 113 is accommodated in the space formed between the first protruding structure 131 and the top surface of the battery pack 110, and the second electrode 114 is accommodated in the space formed between the second protruding structure 132 and the top surface of the battery pack 110, and the first protruding structure 131 and the second protruding structure 132 are made of metal materials or non-metallic materials with poor electrical conductivity, so that when the battery pack 100 has thermal runaway, the first protruding structure 131 and the second protruding structure 132 isolate the first electrode 113 and the second electrode 114, avoiding the risks of electrical leakage and high-voltage arcing in the first electrode 113 and the second electrode 114, and also avoiding the high-temperature flue gas generated by thermal runaway from polluting the battery cell 111 and causing a secondary short circuit of the battery cell 111. The third protrusion structure 121 is connected between the first protrusion structure 131 and the second protrusion structure 132 of the corresponding battery pack 110, and the explosion-proof valve 112 is located in the space formed by the first protrusion structure 131, the second protrusion structure 132, the third protrusion structure 121 and the top surface of the battery pack 110. When thermal runaway occurs, the first protrusion structure 131, the second protrusion structure 132, the third protrusion structure 121 and the top surface of the battery pack 110 form a smoke exhaust channel to discharge a large amount of high-temperature smoke discharged from the explosion-proof valve 112, and the smoke exhaust channel isolates the high-temperature smoke from the first electrode 113 and the second electrode 114 of the battery cell 111 of the battery pack 100, thereby avoiding the safety hazard of secondary short circuit in the battery cell 111.

[0052] At the same time, the third protruding structure 121 can transfer the force it receives to the top surface of the battery pack 110 through the first protruding structure 131 and the second protruding structure 132, so that the battery cell 111 indirectly participates in the load-bearing. The protruding shapes of the first protruding structure 131, the second protruding structure 132 and the third protruding structure 121 are preferably trapezoidal or rectangular, so that the first protruding structure 131, the second protruding structure 132 and the third protruding structure 121 have good load-bearing performance.

[0053] Further, in the battery pack 100 according to the present invention, reference is made to Figure 3 The first protective portion 130 also includes a first connecting structure 133 integrally formed with the first protruding structure 131, and a second connecting structure 134 integrally formed with the second protruding structure 132, wherein the first connecting structure 133 is arranged on both sides of the first protruding structure 131, and the first protruding structure 131 is adhered to the top surface of the battery pack 110 through the first connecting structure 133 and is covered on the top of the battery pack 110; the second connecting structure 134 is arranged on both sides of the second protruding structure 132, and the second protruding structure 132 is adhered to the top surface of the battery pack 110 through the second connecting structure 134 and is covered on the top of the battery pack 110.

[0054] It should be noted that those skilled in the art should understand that the first connecting structure 133 and the second connecting structure 134 can be stamped integrally with the first protruding structure 131 and the second protruding structure 132, respectively, or the first connecting structure 133 and the second connecting structure 134 can be connected to the first protruding structure 131 and the second protruding structure 132, respectively, by welding, gluing, etc., as long as it is ensured that there is no electrical leakage at the connection and that there is sufficient sealing.

[0055] With the above-mentioned structural arrangement, preferably, the first connecting structure 133 and the second connecting structure 134 can be stamped integrally with the first protruding structure 131 and the second protruding structure 132, respectively, so that the connection between the first connecting structure 133 and the second connecting structure 134 and the first protruding structure 131 and the second protruding structure 132 is more stable, thereby increasing the load-bearing performance of the first protective portion 130; the arrangement of the first connecting structure 133 and the second connecting structure 134 increases the connection area between the first protruding structure 131 and the second protruding structure 132 and the top of the battery pack 110. When thermal runaway occurs, the first protruding structure 131 and the second protruding structure 132 are more firmly connected to the top surface of the battery pack 110 through the first connecting structure 133 and the second connecting structure 134, thereby avoiding falling off due to weak connections during thermal runaway, thereby exposing the battery cell 111 to an environment with high-temperature flue gas, etc., increasing the risk of contamination of the battery cell 111 and secondary short circuit, and avoiding further expansion of the thermal runaway hazard.

[0056] Further, in the battery pack 100 according to the present invention, see Figure 1 as well as Figure 3 The battery pack top cover 120 includes a plate-shaped cover body 122 and at least one third protrusion structure 121 protruding from the cover body 122 toward a direction away from the battery pack 110; wherein, the two sides of each third protrusion structure 121 are respectively fitted with the top surfaces of the corresponding first protrusion structure 131 and the second protrusion structure 132.

[0057] For details, see Figure 3On both sides of the third protruding structure 121 are the cover bodies 122, which are plate-like structures. The cover bodies 122 are in contact with the top surfaces of the corresponding first protruding structures 131 and second protruding structures 132 and are detachably connected. The number of third protruding structures 121 is consistent with the number of battery packs 110 arranged along the vertical direction B. With the above-mentioned arrangement, the first protruding structure 131 and the second protruding structure 132 support the battery pack cover 120, thereby increasing the load-bearing capacity of the battery pack cover 120. For example, when the battery pack 100 is a car battery pack, the battery pack cover 120 can also be used as the vehicle body floor. At this time, the vehicle body and the battery pack 100 are integrated. The battery pack cover 120 has excellent load-bearing capacity, which can save a large number of structural parts used for vehicle body load-bearing, while saving space in the entire vehicle. At the same time, the third protruding structure 121 can cover all explosion-proof valves 112. When thermal runaway occurs, the third protrusion structure 121 confines the high-temperature flue gas ejected from the explosion-proof valve 112 within the exhaust channel formed by the first protrusion structure 131, the second protrusion structure 132, the third protrusion structure 121 and the top surface of the battery pack 100, thereby preventing the leakage of high-temperature flue gas and the short circuit of the battery cell 111 caused by the high-temperature flue gas leaking into the battery cell 111. At the same time, the provision of multiple third protrusion structures 121 speeds up the exhaust of high-temperature flue gas and reduces the temperature transmitted to the battery pack cover 120, thereby avoiding equipment damage and personal injury caused by high temperature.

[0058] Further, in the battery pack 100 according to the present invention, see Figure 1 as well as Figure 4 The battery pack 100 includes a plurality of battery packs 110 arranged side by side in a vertical direction B, and the vertical direction B is perpendicular to the cell arrangement direction A of the battery packs 110; wherein the portions where the first protective portions 130 of two adjacent battery packs 110 are connected to each other form an integrated structure.

[0059] For details, see Figure 4When there are multiple battery packs 110, the top surfaces of adjacent battery packs 110 are each provided with a first protruding structure 131, a first connecting structure 133, a second protruding structure 132, and a second connecting structure 134. In this case, the adjacent first protruding structures 131 and second protruding structures 132 are interconnected or integrally stamped and formed via the corresponding first connecting structures 133 and second connecting structures 134, thereby forming a single body. The specific connection method may be gluing or welding, which is not the sole limitation in this embodiment. With the above-described arrangement, the connecting portions of the first protective portions 130 of two adjacent battery packs 110 are preferably integrally stamped and formed, thereby simultaneously forming an isolation and protection for the second electrodes 114 and first electrodes 113 of the adjacent battery packs 110, facilitating the installation of the first protective portions 130 on the top surfaces of the adjacent battery packs 110. This also increases the bearing area between the first protective portion 130 and the cover body 122, thereby providing the first protective portion 130 with a better bearing capacity for the battery pack cover 120.

[0060] Further, in the battery pack 100 according to the present invention, see Figure 3 A high-temperature resistant glue (not shown in the figure) is provided between the first connecting structure 133 and the second connecting structure 134 and the top surface of the battery pack 110; a high-temperature resistant glue (not shown in the figure) is provided between the cover body 122 and the first protruding structure 131 and the second protruding structure 132.

[0061] Specifically, based on the temperature range when thermal runaway occurs, if the maximum temperature during thermal runaway is not higher than 400°C, organic high-temperature glue can be selected, such as: silicone glue, phenolic resin glue, urea-formaldehyde resin glue, heat-resistant epoxy glue, polyimide glue, etc.; if the temperature during thermal runaway is higher, inorganic high-temperature glue can be selected, such as: high-temperature glue made of inorganic ceramic powder, aluminosilicate and other ingredients. People in this field can choose a specific high-temperature resistant glue according to specific application requirements, and this embodiment does not make a sole limitation on this.

[0062] With the above-mentioned setting method, high-temperature resistant glue is provided between the first connecting structure 133 and the second connecting structure 134 and the top surface of the battery pack 110. When thermal runaway occurs, the connection reliability between the first connecting structure 133 and the second connecting structure 134 and the top surface of the battery pack 110 is guaranteed, and high-temperature flue gas and the like are prevented from entering the space between the first connecting structure 133 and the second connecting structure 134 and the top surface of the battery pack 110, thereby avoiding the safety hazard of secondary short circuit caused by contamination of the battery cell 111 by high-temperature flue gas and the like; high-temperature resistant glue is provided between the cover body 122 and the first protruding structure 131 and the second protruding structure 132. When thermal runaway occurs, the connection reliability between the cover body 122 and the first protruding structure 131 and the second protruding structure 132 is guaranteed, and high-temperature flue gas ejected from the explosion-proof valve 112 is prevented from leaking from the exhaust channel formed by the first protruding structure 131, the second protruding structure 132, the third protruding structure 121 and the top surface of the battery pack 110.

[0063] Furthermore, in the battery pack 100 according to the present invention, the first protective portion 130 is made of a non-metallic high-temperature resistant composite material, and the battery pack cover 120 is made of a high-strength metal material. Specifically, the first protruding structure 131, the first connecting structure 133, the second protruding structure 132 and the second connecting structure 134 are all made of a non-metallic high-temperature resistant composite material. When thermal runaway occurs, the battery cell 111 will be close to the metal material and a high-voltage arc phenomenon will occur. The non-metallic high-temperature resistant composite material ensures better insulation performance and has a better electrical isolation effect, avoiding the high voltage released by the first electrode 113 and the second electrode 114 from causing damage to the battery pack cover 120; the third protruding structure 121 and the cover body 122 are both made of high-strength metal materials, and the first protruding structure 131, the first connecting structure 133, the second protruding structure 132 and the second connecting structure 134 are all made of non-metallic high-temperature resistant composite materials. After the structure 133, the second protruding structure 132 and the second connecting structure 134 isolate the high voltage electricity, the battery pack cover 120 made of high-strength metal material is not easily damaged by the high voltage electricity generated by the battery cell 111, and has strong high temperature resistance and excellent load-bearing performance. For example, if the battery pack 100 is applied to a car, for a car with an integrated battery and body, the battery pack cover 120 made of high-strength metal material can directly participate in the load-bearing as the body, and the battery pack 110 plays an indirect load-bearing role on the battery pack cover 120, thereby saving the layout space in the car to a certain extent, and saving the structural parts used for load-bearing.

[0064] Further, in the battery pack 100 according to the present invention, see Figure 1 as well as Figure 2, further comprising a battery pack tray 140, which includes side panels 141 and a bottom panel (not shown). The side panels 141 extend along the periphery of the bottom panel and are perpendicular to the bottom panel. The side panels 141 near the battery pack cover 120 include a flange structure 1411 with threaded holes 1412 spaced apart. The battery pack cover 120 and the side panels 141 are detachably connected, see Figure 1 , a connecting portion 123 adapted to the flange structure 1411 is provided on the side of the battery pack cover 120 close to the side panel 141, and a threaded hole corresponding to the threaded hole 1412 of the flange structure 1411 is provided on the connecting portion 123 (not shown in the figure). Specifically, the battery pack cover 120 and the battery pack tray 140 are connected one-to-one with the threaded holes 1412 on the flange structure 1411 of the side panel 141 through the threaded holes on the connecting portion 123. With the above-mentioned structural arrangement, after the battery pack tray 140 is connected to the battery pack cover 120, the battery pack 110 is protected in the space formed by the battery pack tray 140 and the battery pack cover 120, thereby providing the battery pack 110 with storage space and a protective cover to prevent the battery pack 110 from thermal runaway due to direct collision or the like.

[0065] Furthermore, in the battery pack 100 according to the present invention, at least one transverse reinforcement beam and / or at least one longitudinal reinforcement beam is also provided on the top of the bottom plate of the battery pack tray 140, at least one transverse reinforcement beam is provided along the vertical direction B, and at least one longitudinal reinforcement beam is provided along the battery cell arrangement direction A of the battery pack 100.

[0066] Specifically, one or more transverse reinforcing beams may be provided on the top of the base plate; one or more longitudinal reinforcing beams may be provided on the top of the base plate; one or more transverse reinforcing beams and one or more longitudinal reinforcing beams may be provided on the top of the base plate at the same time; it should be noted that when multiple transverse reinforcing beams or multiple longitudinal reinforcing beams are required to further enhance the rigidity of the battery pack tray 140, multiple transverse reinforcing beams or multiple longitudinal reinforcing beams are arranged at equal intervals along the vertical direction B or the battery cell arrangement direction A, and the number of beams may be 2, 3, etc. The specific number of beams may be determined according to actual usage requirements.

[0067] For more details, see Figure 2 Taking the setting of a transverse reinforcing beam 142 as an example, a transverse reinforcing beam 142 is set on the top of the bottom plate along the vertical direction B. The transverse reinforcing beam 142 connects the two side plates 141 arranged in the vertical direction B, and divides the battery pack tray 140 into two areas along the battery cell arrangement direction A. Both areas can be used to accommodate one or more battery packs 110.

[0068] With the above-mentioned arrangement, the provision of the transverse reinforcement beam 142 enhances the rigidity of the battery pack tray 140 , further improves the protective effect of the battery pack tray 140 , and at the same time provides partial bearing capacity for the battery pack cover 120 , thereby increasing the bearing capacity of the battery pack cover 120 .

[0069] Furthermore, the present invention also discloses an automobile, including the battery pack 100 described in the above embodiment. Therefore, the automobile provided by the present invention has excellent thermal runaway protection when the battery pack 100 experiences thermal runaway. In particular, it can prevent the high-temperature flue gas ejected from the explosion-proof valve 112 from contaminating the battery cells 111 of the battery pack 100 when thermal runaway occurs, thereby avoiding the harm caused by a secondary short circuit in the battery cells 111. It should be noted that the battery pack 100 provided in this embodiment can be applied not only to automobiles, but also to drones, electric vehicles, and other devices that use the battery pack 100 as a driving energy source.

[0070] In summary, the present invention discloses a battery pack 100, comprising at least one battery pack 110 and a battery pack cover 120, each battery pack 110 comprising a plurality of battery cells 111 arranged side by side, the top surface of each battery cell 111 being provided with an explosion-proof valve 112 and a first electrode 113 and a second electrode 114 located on both sides of the explosion-proof valve 112; a first protective portion 130 made of a non-metallic high-temperature resistant composite material is provided on the top of each battery pack 110, and the battery pack cover 120 is detachably fixed to the top of the first protective portion 130; wherein the first protective portion 130 comprises a first protruding structure 131 and a second protruding structure 132, the first protruding structure 131 The first and second protruding structures 131 and 132 extend along the cell arrangement direction A of the battery pack 110 and are detachably covered on the top of the battery pack 110. In addition, all the first electrodes 113 of the battery pack 110 are accommodated in the space formed between the first protruding structure 131 and the top surface of the battery pack 110, and all the second electrodes 114 of the battery pack 110 are accommodated in the space formed between the second protruding structure 132 and the top surface of the battery pack 110, so that when the battery pack 100 has thermal runaway, the first protruding structure 131 and the second protruding structure 132 isolate the first electrodes 113 and the second electrodes 114, thereby preventing the first electrodes 113 and the second electrodes 114 from electrical leakage. Exposure also avoids the harm caused by the high-temperature flue gas generated by thermal runaway polluting the battery cell 111 and causing the secondary short circuit of the battery cell 111; and the battery pack cover 120 includes at least one third protrusion structure 121 made of high-strength metal material, each third protrusion structure 121 spans between the first protrusion structure 131 and the second protrusion structure 132 of a corresponding battery pack 110, and extends along the battery cell arrangement direction A of the battery pack 110, and all the explosion-proof valves 112 of the battery pack 110 are located in the space formed by the third protrusion structure 121 and the top surface of the battery pack 110, so that when the battery pack 100 has thermal runaway, the third protrusion structure 121 is isolated and quickly The high-temperature flue gas ejected from the explosion-proof valve 112 is discharged, thereby preventing the high-temperature flue gas ejected from the explosion-proof valve 112 from affecting the battery cell 111 of the battery pack 100 when thermal runaway occurs, thereby avoiding the harm caused by the secondary short circuit of the battery cell 111, and further improving the protection performance of the battery cell 111 when thermal runaway occurs. At the same time, the third protrusion structure 121 is connected across the first protrusion structure 131 and the second protrusion structure 132 of the corresponding battery pack 110, and the first protrusion structure 131 and the second protrusion structure 132 are both covered on the top of the battery pack 110, so that the battery cell 111 can indirectly bear the force from the third protrusion structure 121.

[0071] Next, see Figures 1 to 4 The assembly process of the battery pack 100 disclosed in the present invention is briefly described as follows:

[0072] First, place the battery pack 110 in the battery pack tray 140 in sequence, and then apply high-temperature resistant glue on the first connection structure 133 and the second connection structure 134 of the multiple first protective parts 130 facing the top surface of the battery pack 110. Then, adhere the multiple first protective parts 130 to the top surface of the battery pack 110 with the first protruding structure 131 corresponding to the first electrode 113 and the second protruding structure 132 corresponding to the second electrode 114. The portion of the cover body 122 corresponding to the second protruding structure 132 is coated with high-temperature resistant glue, and then the battery pack cover 120 is bonded to the top surface of the first protective part 130 according to the third protruding structure 121 corresponding to the explosion-proof valve 112. It should be noted at this time that the threaded holes on the connecting part 123 and the threaded holes 1412 of the flange structure 1411 of the side panel 141 are aligned one by one. Finally, the battery pack cover 120 and the battery pack tray 140 are connected together by bolts, and the assembly of the battery pack 100 is completed.

[0073] Furthermore, the protection process of the battery pack 100 disclosed in the present invention when thermal runaway occurs is described as follows:

[0074] If thermal runaway occurs in the battery pack 100, first, if the internal pressure of the battery pack 100 exceeds a preset safety value, all explosion-proof valves 112 will automatically open and begin to release the high-temperature flue gas accumulated in the battery pack 100. The high-temperature flue gas will be discharged through a smoke exhaust channel formed by multiple first protrusion structures 131, the second protrusion structure 132, the third protrusion structure 121 and the top surface of the battery pack 110, thereby preventing the high-temperature flue gas released by the explosion-proof valve 112 from affecting the battery cell 111 of the battery pack 100. At the same time, the first protrusion structure 131 and the second protrusion structure 132 made of a non-metallic high-temperature resistant composite material will isolate the first electrode 113 and the second electrode 114, thereby preventing electrical leakage of the first electrode 113 and the second electrode 114. At the same time, the first protrusion structure 131 and the second protrusion structure 132 will further prevent the high-temperature flue gas from contaminating the battery cell 111 and causing a secondary short circuit safety hazard of the battery cell 111.

[0075] It should be noted that, in addition to the implementation methods of the present invention described in the above-mentioned specific embodiments, those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Although the description of the present invention will be introduced in conjunction with the preferred embodiment, this does not mean that the features of this utility model are limited to this implementation method. On the contrary, the purpose of introducing the utility model in conjunction with the implementation method is to cover other options or modifications that may be extended based on the claims of the present utility model. In order to provide an in-depth understanding of the present utility model, the above description contains many specific details, and the present utility model can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the present utility model, some specific details will be omitted in the description. It should be noted that, in the absence of conflict, the embodiments of the present utility model and the features in the embodiments can be combined with each other.

[0076] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0077] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as a limitation on the utility model.

[0078] The terms “first”, “second”, etc. are only used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0079] In the description of this embodiment, it should be noted that, unless otherwise specified or limited, the terms "disposed," "connected," and "connected" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this embodiment based on specific circumstances.

[0080] Although the present invention has been illustrated and described with reference to certain preferred embodiments of the present invention, it should be understood by those skilled in the art that the above description is provided to further illustrate the present invention in conjunction with specific embodiments, and that the present invention should not be construed as being limited to these descriptions. Those skilled in the art may make various changes in form and detail, including simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A battery pack comprising at least one battery pack and a battery pack cover, wherein each battery pack comprises a plurality of battery cells arranged side by side, and the top surface of each battery cell is provided with an explosion-proof valve and a first electrode and a second electrode located on both sides of the explosion-proof valve; characterized in that A first protective portion is provided on the top of each battery pack, and the battery pack cover is detachably fixed to the top of the first protective portion; wherein the first protective portion includes a first protruding structure and a second protruding structure, the first protruding structure and the second protruding structure both extend along the direction in which the battery cells of the battery pack are arranged, and are detachably covered on the top of the battery pack, and all the first electrodes of the battery pack are accommodated in the space formed between the first protruding structure and the top surface of the battery pack, and all the second electrodes of the battery pack are accommodated in the space formed between the second protruding structure and the top surface of the battery pack; and The battery pack cover includes at least one third protrusion structure, each of the third protrusion structures spans between the first protrusion structure and the second protrusion structure of a corresponding battery pack and extends along the direction of arrangement of the battery cells of the battery pack. All the explosion-proof valves of the battery pack are located in the space formed by the third protrusion structure and the top surface of the battery pack.

2. The battery pack according to claim 1, wherein: The first protection portion further includes a first connecting structure integrally formed with the first protruding structure, and a second connecting structure integrally formed with the second protruding structure, wherein The first connecting structure is provided on both sides of the first protruding structure, and the first protruding structure is covered on the top of the battery pack through the first connecting structure and the top surface of the battery pack; The second connecting structure is provided on both sides of the second protruding structure, and the second protruding structure is covered on the top of the battery pack by adhering to the top surface of the battery pack through the second connecting structure.

3. The battery pack according to claim 2, wherein: The battery pack upper cover includes a plate-shaped cover body and at least one third protrusion structure protruding from the cover body in a direction away from the battery pack; in The cover bodies on both sides of each third protruding structure are respectively fitted with the top surfaces of the corresponding first protruding structure and the second protruding structure.

4. The battery pack according to claim 3, wherein: The battery pack includes a plurality of battery packs arranged side by side in a vertical direction, wherein the vertical direction is perpendicular to the arrangement direction of the battery cells of the battery packs; The portions of the first protection parts of two adjacent battery packs that are connected to each other form an integrated structure.

5. The battery pack according to claim 4, wherein: A high temperature resistant glue is provided between the first connecting structure, the second connecting structure and the top surface of the battery pack; High temperature resistant glue is provided between the cover body and the first protruding structure and the second protruding structure.

6. The battery pack according to any one of claims 1 to 5, wherein: The first protective part is made of a non-metallic high-temperature resistant composite material, and the battery pack cover is made of a high-strength metal material.

7. The battery pack according to claim 6, wherein: It also includes a battery pack tray, which includes side panels and a bottom plate. The side panels are distributed along the circumference of the bottom plate and are perpendicular to the bottom plate. The side panel close to the battery pack cover includes a flange structure with threaded holes spaced apart.

8. The battery pack according to claim 7, wherein: The battery pack cover is detachably connected to the side panel, and a connection portion adapted to the flange structure is provided on the side of the battery pack cover close to the side panel, and The connecting portion is provided with a threaded hole corresponding to the threaded hole of the flanging structure.

9. The battery pack according to claim 8, wherein: At least one transverse reinforcement beam and / or at least one longitudinal reinforcement beam is also provided on the top of the bottom plate in the battery pack tray. The at least one transverse reinforcement beam extends in a vertical direction, and the at least one longitudinal reinforcement beam extends along the battery cell arrangement direction of the battery pack.

10. An automobile, characterized in that: The automobile comprises the battery pack according to any one of claims 1 to 9.

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