Battery pack and power device

Abstract

A battery pack (100) and a power device. The battery pack (100) comprises an edge beam (1), a first protective plate (2), a second protective plate (3), and a battery module (4); the edge beam (1) is annular; a first cavity (11) is formed in the edge beam (1); a first through hole (12) is formed on the outer peripheral wall of the edge beam (1); a first explosion-proof valve (13) is provided in the first through hole (12); the first protective plate (2) is arranged at one end of the edge beam (1) in the axial direction and is connected to the edge beam (1); the first protective plate (2) is configured to block one end of the edge beam (1) in the axial direction and defines a mounting space (21) together with the edge beam (1); the second protective plate (3) and the first protective plate (2) are provided on the same end of the edge beam (1), and the second protective plate (3) is connected to the edge beam (1); the second protective plate (3) is located on the side of the first protective plate (2) away from the mounting space (21); the second protective plate (3) and the first protective plate (2) are spaced apart from each other and define a gas outlet channel (31); the gas outlet channel (31) is communicated with the first cavity (11) and the mounting space (21); and the battery module (4) is arranged in the mounting space (21). According to the battery pack (100) and the power device, the risks that other parts in the battery pack cannot be normally used and the whole battery pack is subjected to thermal runaway due to thermal runaway of battery cells can be effectively reduced.

Description

Battery pack and power unit

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent applications with application number CN202322155824.3, entitled “Battery Pack”, and application number CN202322162382.5, entitled “Battery Pack”, filed with the Chinese Patent Office on August 10, 2023, and priority to the Chinese patent application with application number CN202322191076.4, entitled “Battery Pack and Power Device”, filed with the Chinese Patent Office on August 15, 2023, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the field of battery technology, and in particular to battery packs and power devices. Background Art

[0004] Electric vehicles' energy comes from their power battery packs, making battery pack technology crucial. Existing power battery packs offer high power and capacity, but thermal runaway can cause the packs to generate large amounts of gas and ejecta within a short period of time.

[0005] When thermal runaway occurs in a battery cell, a large amount of gas and ejecta will be ejected from the battery cell explosion-proof valve. If these gases and ejecta are not drained in time, it will easily affect the normal use of other components in the battery pack, and may cause insulation failure and structural failure of electrical components (wiring harnesses, copper bars) and structural parts, greatly exacerbating the risk of thermal runaway of the entire pack caused by thermal runaway of the battery cell.

[0006] Application Contents

[0007] In view of this, the present application discloses a battery pack and a power device to solve the problem of thermal runaway of the battery cells causing other components inside the battery pack to be unable to function normally and the problem of thermal runaway of the entire battery pack.

[0008] In the first aspect, the present application provides a battery pack, comprising: a side beam, the side beam being formed in a ring shape, the side beam having a first cavity therein, a first through hole connected to the first cavity being provided on the outer peripheral wall of the side beam, and a first explosion-proof valve being provided in the first through hole; a first guard plate, the first guard plate being provided at one end of the side beam in the axial direction and connected to the side beam, the first guard plate being configured to block one end of the side beam in the axial direction and defining an installation space with the side beam; a second guard plate, along the axial direction of the side beam, the second guard plate and the first guard plate being provided at the same end of the side beam and connected to the side beam, the second guard plate being located on a side of the first guard plate away from the installation space, the second guard plate being spaced apart from the first guard plate and defining an air outlet channel, the air outlet channel connecting the first cavity and the installation space; a battery module, the battery module being provided in the installation space.

[0009] According to the battery pack of this embodiment, a double-layer protective structure can be formed by providing a first protective plate and a second protective plate, which greatly enhances the structural strength of the battery pack and improves the protective strength of the battery pack. By using the first cavity in the side beam and the air outlet channel between the first and second protective plates as the exhaust structure, the exhaust efficiency of the battery pack is improved, effectively preventing the battery pack from overheating and causing combustion or even explosion. It can also improve the space utilization of the battery pack, reduce the size of the battery pack, and reduce the production cost of the battery pack. Through the first protective plate, the second protective plate, and the air outlet channel between the first and second protective plates, the battery pack can effectively reduce the risk of other components in the battery pack not being able to function normally and the risk of thermal runaway of the entire battery pack due to thermal runaway of the battery cell.

[0010] In some embodiments, a first communicating hole is provided on the side beam at a position opposite to the air outlet channel, and the first communicating hole connects the first cavity and the air outlet channel.

[0011] In some embodiments, the side beam further has a second communicating hole communicating with the installation space.

[0012] In some embodiments, the battery module includes multiple battery cells, and the multiple battery cells are arranged in multiple rows along a first direction. Each row of the battery cells includes multiple battery cells arranged along a second direction, and the first direction, the second direction and the axial direction of the side beam are perpendicular to each other.

[0013] In some embodiments, a second cavity is defined within the first guard plate, the second cavity is communicated with the first cavity, each of the battery cells has a battery cell explosion-proof valve on the side facing the first guard plate, a plurality of second through holes communicated with the air outlet channel are provided on the first guard plate, each of the second through holes is arranged opposite to at least one of the battery cell explosion-proof valves, the second through hole includes a first sub-through hole and a second sub-through hole, the first sub-through hole and the second sub-through hole are arranged opposite to each other in the axial direction of the side beam, the first sub-through hole communicates with the second cavity and the installation space and is opposite to the battery cell explosion-proof valve, the second sub-through hole communicates with the air outlet channel and the second cavity.

[0014] In some embodiments, the second cavity includes a plurality of sub-cavities arranged along the first direction, both ends of each sub-cavity along the second direction are connected to the first cavity, the plurality of sub-cavities correspond one-to-one to the plurality of rows of battery cells, each sub-cavity has at least one first sub-through hole and the second sub-through hole, and the battery cell explosion-proof valve is arranged relative to the first sub-through hole connected to the corresponding sub-cavity.

[0015] In some embodiments, a side of the first guard plate facing the installation space has a plurality of protrusions spaced apart along the first direction, each of the protrusions extends along the second direction, and any protrusion is located between two adjacent rows of the battery cells.

[0016] In some embodiments, the installation space has a crossbeam, and the two ends of the crossbeam in the length direction are respectively connected to the side beams. The installation space includes a first installation space and a second installation space located on both sides of the crossbeam. The battery module is arranged in the first installation space, and the electrical device is arranged in the second installation space.

[0017] In some embodiments, the side beam and the first guard plate are aluminum profiles.

[0018] In some embodiments, there are multiple first explosion-proof valves, and the multiple first explosion-proof valves are arranged at opposite ends of the side beam.

[0019] In a second aspect, the present application further provides a battery pack, comprising a housing, and a battery cell disposed in the housing;

[0020] The housing includes a bottom base plate and a bottom guard plate located below the bottom base plate, wherein the bottom base plate and the bottom guard plate are spaced apart to form a cavity;

[0021] A battery cell explosion-proof valve is provided at the bottom of the battery cell, and a battery pack explosion-proof valve is provided on the shell. The battery cell explosion-proof valve can be connected to the battery pack explosion-proof valve through the cavity.

[0022] The battery pack of this embodiment prevents other components within the battery pack from being affected by the high-temperature gases and ejecta generated by thermal runaway by discharging them from the battery cell explosion-proof valve through the cavity and out of the battery pack explosion-proof valve. This minimizes the impact of thermal runaway on the battery pack. Furthermore, the cavity is formed between the base plate and the bottom guard plate, and the battery cell explosion-proof valve is located at the bottom of the battery cell, resulting in a simple structure and easy layout and implementation. This battery pack effectively reduces the risk of malfunctioning components within the battery pack and thermal runaway of the entire battery pack due to thermal runaway of the battery cell.

[0023] In some embodiments, a high-temperature protective layer is provided on the top of the bottom guard plate. This high-temperature protective layer protects the bottom guard plate, preventing high-temperature gases and ejecta generated during thermal runaway of the battery cells from directly impacting the inner surface of the bottom guard plate, thereby extending the service life of the bottom guard plate.

[0024] In some embodiments, the high temperature resistant protective layer is a mica board arranged on the bottom guard plate.

[0025] In some embodiments, the battery pack explosion-proof valve is connected to the cavity through a guide member; by providing a guide member, it is convenient to connect the cavity and the battery pack explosion-proof valve, while making the guide channel include a horizontal part and a vertical part, which has a simple structure and is easy to process.

[0026] A flow guiding channel is formed on the flow guiding member, and the flow guiding channel has a vertical portion communicating with the cavity, and a horizontal portion communicating with the battery pack explosion-proof valve.

[0027] In some embodiments, the base substrate is provided with a communication port configured to connect the battery cell explosion-proof valve and the cavity. A protective plate is provided between the battery cell explosion-proof valve and the communication port, and the protective plate can be destroyed by gas and ejected materials ejected from the battery cell explosion-proof valve. The provision of the protective plate facilitates protection of the battery cell explosion-proof valve, preventing foreign matter that may be present in the battery pack from squeezing and damaging the battery cell explosion-proof valve.

[0028] In some embodiments, a protrusion is formed on the protective plate and protrudes toward the communication port, and an escape space is formed between the protrusion and the battery cell explosion-proof valve.

[0029] In some embodiments, the battery cell is multiple and is disposed in the housing;

[0030] The battery pack further includes a busbar configured to connect the poles of each of the battery cells, and a connecting copper bar connected to the busbar.

[0031] In some embodiments, the busbar and the connecting copper bar are arranged at the top of the battery cell. The battery cell explosion-proof valve is arranged at the bottom of the battery cell, while the busbar and the connecting copper bar are arranged at the top of the battery cell, which can achieve thermal and electrical separation when the battery pack experiences thermal runaway.

[0032] In some embodiments, the housing further comprises a side support beam provided on one side of the bottom substrate, a high-pressure plug-in and a low-pressure plug-in are provided on the side support beam, and the high-pressure plug-in and the low-pressure plug-in are arranged at intervals along the length direction of the side support beam;

[0033] The battery pack explosion-proof valve is arranged on the side support beam and is located between the high-voltage plug-in and the low-voltage plug-in.

[0034] On the third aspect, the present application also provides a battery pack, including a battery cell and a shell, and a battery cell explosion-proof valve is provided on the battery cell; the shell includes: an upper shell and a lower shell, the upper shell and the lower shell cooperate to construct an installation space, the battery cell is installed in the installation space, and an explosion-proof cavity is formed inside the lower shell, the explosion-proof cavity includes a first cavity and a second cavity, the first cavity is located inside the bottom plate of the lower shell, and the second cavity is located inside the circumferential side plate of the lower shell, and the first cavity is connected to the second cavity; an exhaust port is provided on the lower shell, the exhaust port is connected to the explosion-proof cavity, and the exhaust port is arranged opposite to the battery cell explosion-proof valve.

[0035] According to the battery pack of this embodiment, an explosion-proof cavity is provided inside the lower shell, so that high-temperature charged substances ejected from the battery cells enter the explosion-proof cavity, thereby preventing the high-temperature charged substances from entering the installation space and causing damage to other charged structures inside the battery pack; by providing the first cavity and the second cavity inside the bottom plate and the side plate respectively, not only the overall volume of the explosion-proof cavity is effectively improved, but also the internal space of the lower shell is fully utilized, thereby improving space utilization, and effectively reducing the risk of other components inside the battery pack not being able to be used normally and the risk of thermal runaway of the entire battery pack due to thermal runaway of the battery cells.

[0036] In some embodiments, the bottom plate has a first plate body and a second plate body, the first plate body is spaced apart from the second plate body to construct the first cavity, the side plate has a third plate body and a fourth plate body, the third plate body is spaced apart from the fourth plate body to construct the second cavity, the first plate body is arranged on a side of the second plate body close to the battery cell, and the third plate body is arranged on a side of the fourth plate body close to the battery cell.

[0037] In some embodiments, the third plate body surrounds the circumference of the first plate body, and the fourth plate body surrounds the circumference of the second plate body, so as to construct the second cavity surrounding the circumference of the lower shell.

[0038] In some embodiments, the exhaust port is arranged on the first plate, the battery cell explosion-proof valve is arranged at the bottom of the battery cell, multiple battery cells are arranged along a first direction, and the exhaust port extends along the first direction. In the first direction, the battery cell explosion-proof valves of multiple battery cells are opposite to the exhaust port.

[0039] In some embodiments, in the second direction, the battery cells are arranged in at least one row, and the exhaust port is provided at least one, the number of rows of the battery cells corresponds to the number of the exhaust ports, and the second direction is perpendicular to the first direction.

[0040] In some embodiments, in the second direction, bosses are provided on the first plate on both sides of the exhaust port, the bosses extend along the first direction, and the upper surfaces of the bosses abut against the bottom surfaces of the plurality of battery cells to seal the explosion-proof cavity.

[0041] In some embodiments, a sealant is provided between the upper surface of the boss and the bottom surfaces of the plurality of battery cells to seal the gap between the upper surface of the boss and the bottom surfaces of the battery cells.

[0042] In some embodiments, in the second direction, an escape space is defined between the boss and the third plate body and between the bosses of two adjacent exhaust ports, and a water-cooling plate is provided in the escape space. The water-cooling plate extends along the first direction, and the upper surface of the water-cooling plate is glued to the lower surfaces of the plurality of battery cells.

[0043] In some embodiments, an explosion-proof hole is provided on the lower shell, the explosion-proof hole is located on the second plate body or the fourth plate body, the explosion-proof hole connects the explosion-proof cavity and the external space, and a second explosion-proof valve is provided in the explosion-proof hole.

[0044] In some embodiments, the lower shell includes a support member, which is disposed in the first cavity. The upper end of the support member is fixedly connected to the first plate body, and the lower end of the support member is fixedly connected to the second plate body.

[0045] In a fourth aspect, the present application also provides a power device, which is provided with a battery pack as described above.

[0046] The power device described in this embodiment is provided with the battery pack as described above, which is conducive to customer satisfaction with the power device. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0048] FIG1 is a perspective view of a first structure of a battery pack according to an embodiment of the present application;

[0049] FIG2 is an exploded view of a first structure of a battery pack according to an embodiment of the present application;

[0050] Figure 3 is an enlarged view of point A in Figure 2;

[0051] FIG4 is a perspective view of a first structure of a battery pack according to an embodiment of the present application, wherein the first guard plate and the battery module are not shown;

[0052] FIG5 is an enlarged view of point B in FIG4 ;

[0053] FIG6 is a top view of a first structure of a battery pack according to an embodiment of the present application;

[0054] FIG7 is a cross-sectional view taken along CC in FIG6;

[0055] FIG8 is an enlarged view of point D in FIG7;

[0056] FIG9 is an enlarged view of point E in FIG7 ;

[0057] FIG10 is a partial top view of a second structure of a battery pack according to an embodiment of the present application;

[0058] FIG11 is a cross-sectional view taken along the FF direction in FIG1 ;

[0059] FIG12 is an enlarged view of portion G in FIG2 ;

[0060] FIG13 is a partial structural diagram of a second structure of a battery pack according to an embodiment of the present application;

[0061] FIG14 is an exploded view of a third structure of a battery pack according to an embodiment of the present application;

[0062] FIG15 is a top view of a third structure of a battery pack (with the upper housing removed) according to an embodiment of the present application;

[0063] FIG16 is a cross-sectional view along line HH in FIG15 ;

[0064] FIG17 is an enlarged view of area I in FIG16 ;

[0065] FIG18 is an enlarged view of the J region in FIG16 ;

[0066] FIG19 is a schematic structural diagram of a battery cell of a battery pack according to an embodiment of the present application;

[0067] FIG20 is a bottom view of a battery cell of a battery pack according to an embodiment of the present application.

[0068] Explanation of Reference Numerals: 100, battery pack; 1, side beam; 11, first cavity; 12, first through hole; 13, first explosion-proof valve; 14, first communicating hole; 15, second communicating hole; 2, first guard plate; 21, installation space; 210, cross beam; 211, first installation space; 212, second installation space; 22, second through hole; 221, first sub-through hole; 222, second sub-through hole; 23, second cavity; 24, protrusion; 3, second guard plate; 31, air outlet channel; 4, battery module; 41, battery cell; 51. Base plate; 52. Bottom guard plate; 54. Side support beam; 55. Cavity; 56. Cell explosion-proof valve; 7. Battery pack explosion-proof valve; 8. Mica board; 9. Busbar; 10. Connecting copper busbar; 511. High-voltage plug-in; 512. Low-voltage plug-in; 513. Flow guide; 514. Flow diversion channel; 1401. Vertical portion; 1402. Horizontal portion; 515. Connecting port; 16. Protective plate; 1601. Protrusion; 17. Avoidance space; 62. Shell; 621. Upper shell; 622. Lower shell; 6221. Explosion-proof cavity; 6222. Exhaust port; 223. Bottom plate; 224. Side plate; 225. Second explosion-proof valve; 226. Support member; 62211. First cavity; 62212. Second cavity; 2231. First plate; 2232. Second plate; 2241. Third plate; 2242. Fourth plate; 63. Boss; 64. Water-cooled plate. DETAILED DESCRIPTION

[0069] To make the purpose, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of this application.

[0070] The battery pack 100 of this embodiment will be described below with reference to the accompanying drawings.

[0071] In related technologies, when a battery cell is in an abnormal state, discharge or oxidation reactions may occur, generating a large amount of heat and gas. These gases need to be discharged in a timely manner, otherwise the pressure of the battery pack will increase, which may cause thermal runaway of the battery pack.

[0072] Although the existing battery pack exhaust channel technology can meet the exhaust needs of electrochemical energy storage devices such as electric vehicles and hybrid vehicles, it still has some shortcomings: traditional battery packs are limited by structural requirements, and the design space left for both the exhaust channel structure and the exhaust port is relatively small; the exhaust channel is single, and thermal runaway will cause problems such as poor gas circulation, which will hinder the normal discharge of gas, increase the gas pressure in the battery pack, and cause risks such as thermal runaway.

[0073] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a battery pack that can improve the exhaust efficiency of the battery pack, prevent the battery pack from overheating and causing combustion or even explosion, and improve the space utilization of the battery pack.

[0074] As shown in FIG2 and FIG7 , the battery pack 100 according to an embodiment of the present application includes a side beam 1 , a first guard plate 2 , a second guard plate 3 and a battery module 4 .

[0075] Specifically, with reference to Figures 1, 5 and 6, the side beam 1 is formed in a ring shape and can play a supporting role. A first cavity 11 is provided in the side beam 1. A first through hole 12 communicating with the first cavity 11 is provided on the outer peripheral wall of the side beam 1. A first explosion-proof valve 13 is provided in the first through hole 12. The first guard plate 2 is provided at one end of the side beam 1 in the axial direction (refer to the up and down directions shown in Figure 2) and is connected to the side beam 1. The first guard plate 2 is configured to block one end of the side beam 1 in the axial direction and define an installation space 21 with the side beam 1. Referring to Figures 8 and 9, along the axial direction of the side beam 1, the second guard plate 3 and the first guard plate 2 are arranged at the same end of the side beam 1 and are connected to the side beam 1. The second guard plate 3 is located on the side of the first guard plate 2 away from the installation space 21. The second guard plate 3 is separated from the first guard plate 2 and defines an air outlet channel 31. The air outlet channel 31 connects the first cavity 11 and the installation space 21. The battery module 4 is arranged in the installation space 21. The arrangement of the first guard plate 2 and the second guard plate 3 can form a double-layer protection structure, which greatly enhances the structural strength of the battery pack 100 and improves the protection strength of the battery pack 100.

[0076] It is understood that when thermal runaway occurs in the battery module 4, the heat and gases released by the battery module 4 can flow from the mounting space 21 to the gas outlet passage 31, then enter the first cavity 11, and ultimately exit the battery pack 100 through the first explosion-proof valve 13 at the first through-hole 12. This improves the exhaust efficiency of the battery pack 100, effectively preventing combustion or even explosion caused by excessive temperatures within the battery pack 100, and providing a certain degree of environmental protection. Furthermore, by improving the strength and sealing of the gas outlet passage, gas leakage during the gas outlet process can be effectively reduced.

[0077] Optionally, the battery pack 100 can power electric vehicles, hybrid electric vehicles, or other electrochemical energy storage devices. During the charge and discharge process of the battery pack 100, harmful gases such as hydrogen are generated. Furthermore, if the battery modules 4 within the battery pack 100 are in an abnormal state due to overcharging, overdischarging, extreme high or low temperatures, or physical damage, the temperature of the entire battery pack 100 can rise rapidly, generating a large amount of heat and toxic gases.

[0078] Compared with the prior art, the present application uses the first cavity 11 in the side beam 1 and the air outlet channel 31 between the first guard plate 2 and the second guard plate 3 as the exhaust structure, reducing or even eliminating the exhaust space reserved in the battery pack in the prior art, avoiding the loosening of the exhaust pipe connection in the prior art, improving the space utilization of the battery pack 100, reducing the size of the battery pack 100, and reducing the production cost of the battery pack 100.

[0079] Optionally, the first guard plate 2 and the second guard plate 3 are connected by fasteners. The second guard plate 3 is a sheet metal part, which can play a certain supporting role and protect the internal structure of the battery pack 100.

[0080] In addition, the side beams in the prior art only play a supporting role. Since debris is easily generated during processing, more materials are often used to seal the side beam cavities. However, the present application fully utilizes the first cavity 11 of the side beam 1 as an exhaust channel, which relatively reduces the weight of the battery pack 100.

[0081] According to the battery pack 100 of the embodiment of the present application, the first and second guard plates 2 and 3 form a double-layer protective structure, significantly enhancing the structural strength and protective strength of the battery pack 100. By utilizing the first cavity 11 within the side beam 1 and the air outlet channel 31 between the first and second guard plates 2 and 3 as exhaust structures, the exhaust efficiency of the battery pack 100 is improved, effectively preventing excessive temperatures within the battery pack 100 from causing combustion or even explosion. Furthermore, the space utilization of the battery pack 100 is improved, the size of the battery pack 100 is reduced, and the production cost of the battery pack 100 is reduced.

[0082] In some embodiments of the present application, referring to Figures 4 and 5, a first connecting hole 14 is provided on the side beam 1 at a position opposite to the air outlet channel 31. The first connecting hole 14 connects the first cavity 11 and the air outlet channel 31. After the gas released by the battery module 4 flows into the air outlet channel 31 from the installation space 21, it can enter the first cavity 11 through the first connecting hole 14 and finally be discharged by the first explosion-proof valve 13.

[0083] Furthermore, referring to FIG5 , a plurality of first connecting holes 14 are provided at intervals in the circumferential direction of the side beam 1, and the gas in the air outlet channel 31 can flow from the plurality of first connecting holes 14 to the first cavity 11, thereby ensuring the structural strength of the side beam 1 while improving the exhaust efficiency as much as possible and reducing the risk of incomplete exhaust or gas accumulation.

[0084] In some embodiments of the present application, referring to FIG5 , the side beam 1 further has a second communicating hole 15 connected to the installation space 21, and the second communicating hole 15 is connected to the first cavity 11. When an abnormal situation occurs in the battery module 4 and the gas does not flow to the gas outlet channel 31, the gas overflows into the installation space 21, and the pressure inside the battery pack 100 is too high. The setting of the second communicating hole 15 allows the gas in the installation space 21 to flow to the first cavity 11 and then be discharged from the first explosion-proof valve 13, preventing the gas from accumulating in the battery pack 100 when it overflows, avoiding excessive pressure in the battery pack 100, and the setting of the second communicating hole 15 can also balance the air pressure inside and outside the battery pack 100, avoiding the influence of altitude or temperature on the air pressure inside the pack.

[0085] In some embodiments of the present application, as shown in Figures 1, 2, and 6, the battery module 4 includes a plurality of battery cells 41. The plurality of battery cells 41 are arranged in multiple rows along a first direction (as shown in Figure 6), and each row of battery cells 41 includes a plurality of battery cells 41 arranged along a second direction (as shown in Figure 6). The first direction, the second direction, and the axial direction of the side beam 1 are perpendicular to each other, thereby increasing the energy density of the battery pack 100, meeting the power requirements of the battery pack 100, and improving the power storage capacity of the battery pack 100. In one specific example, as shown in Figure 6, the plurality of battery cells 41 are arranged in thirty-six rows along the first direction, and each row of battery cells 41 includes six battery cells 41 arranged along the second direction.

[0086] Optionally, the battery cell 41 may be a long-blade battery cell, a short-blade battery cell, a square battery cell or other battery cells.

[0087] In a further embodiment of the present application, as shown in FIG3 , a second cavity 23 is provided in the first protective plate 2 , and the second cavity 23 is connected to the first cavity 11 . After the gas generated by the battery cell 41 flows into the second cavity 23 from the battery cell explosion-proof valve, it can flow out of the battery pack 100 through the first cavity 11 .

[0088] Furthermore, referring to FIG3 , each battery cell 41 has a battery cell explosion-proof valve on the side facing the first protective plate 2, and the first protective plate 2 is provided with a plurality of second through holes 22 connected to the air outlet channel 31, and each second through hole 22 is arranged opposite to at least one battery cell explosion-proof valve. The setting of the second through holes 22 connects the multiple channels of the battery pack 100 together to form a whole.

[0089] Furthermore, referring to FIG3 , the second through-hole 22 includes a first sub-through-hole 221 and a second sub-through-hole 222. The first sub-through-hole 221 and the second sub-through-hole 222 are arranged opposite each other in the axial direction of the side beam 1. The first sub-through-hole 221 connects the second cavity 23 and the installation space 21 and is opposite the battery cell explosion-proof valve. The second sub-through-hole 222 connects the gas outlet channel 31 and the second cavity 23. After being ejected from the battery cell explosion-proof valve, the gas generated by the battery cell 41 passes through the first sub-through-hole 221 into the second cavity 23, then through the second sub-through-hole 222 into the gas outlet channel 31, and then through the first connecting hole 14 into the first cavity 11, and finally out of the battery pack 100 through the first explosion-proof valve 13 at the first through-hole 12. It can be understood that the provision of the second cavity 23 can further improve the space utilization within the battery pack 100 and enhance the exhaust efficiency of the battery pack 100.

[0090] Optionally, each second through hole 22 may be arranged opposite to one battery cell explosion-proof valve, or each second through hole 22 may be arranged opposite to two or more battery cell explosion-proof valves.

[0091] In a further embodiment of the present application, as shown in FIG3 , the second cavity 23 includes a plurality of sub-cavities arranged along the first direction, and both ends of each sub-cavity along the second direction are connected to the first cavity 11. The plurality of sub-cavities correspond one-to-one to the plurality of rows of battery cells 41, and each sub-cavity has at least one first sub-through hole 221 and a second sub-through hole 222. The battery cell explosion-proof valve is arranged relative to the first sub-through hole 221 connected to the corresponding sub-cavity.

[0092] It can be understood that when thermal runaway occurs in the battery cell 41, the gas generated by the battery cell 41 can flow out of the battery pack 100 through two paths: one is that the gas generated by the battery cell 41 flows into the corresponding sub-cavity through the first sub-through hole 221, flows to the two ends of the sub-cavity along the second direction, directly enters the first cavity 11, and then is discharged from the battery pack 100 through the first explosion-proof valve 13 at the first through hole 12; the other is that the gas generated by the battery cell 41 flows into the corresponding sub-cavity through the first sub-through hole 221, and is divided into multiple streams and flows from multiple second sub-through holes 222 in the sub-cavity to the air outlet channel 31, so that it can pass through the entire air outlet channel 31 to the multiple first connecting holes 14 on the side beam 1, enter the first cavity 11, and be discharged from the first explosion-proof valve 13, thereby realizing multi-path and multi-channel exhaust, thereby improving the exhaust efficiency of the battery pack 100.

[0093] It should be noted that the battery pack 100 of the embodiment of the present application is designed so that all gases and heat avoid direct contact with the battery module 4 and the electrical system, so as to prevent the high temperature shock from interfering with other battery cells 41 and triggering a chain reaction when thermal runaway occurs.

[0094] In a further embodiment of the present application, as shown in Figures 2 and 3 , the first guard plate 2 has a plurality of protrusions 24 spaced apart along a first direction on one side facing the installation space 21. Each protrusion 24 extends along a second direction, and both ends of each protrusion 24 in the length direction (referring to the second direction shown in Figure 3 ) are connected to the side beam 1 . This can strengthen the structural strength of the battery pack 100 and improve the reliability of the battery pack 100 . Any protrusion 24 is located between two adjacent rows of battery cells 41 , acting as a limiter and fixator, preventing the battery cells 41 from moving and ensuring the stability of the battery module 4 .

[0095] In some embodiments of the present application, as shown in FIG2 , a crossbeam 210 is provided in the installation space 21 , and both ends of the crossbeam 210 in the length direction (refer to the second direction shown in FIG2 ) are respectively connected to the side beam 1 , and the installation space 21 includes a first installation space 211 and a second installation space 212 located on both sides of the crossbeam 210 , the battery module 4 is arranged in the first installation space 211 , and the electrical components are arranged in the second installation space 212 . The arrangement of the crossbeam 210 can play a role in strengthening the structural strength, improving the reliability of the battery pack 100 , and can separate the battery module 4 from the electrical components, which can facilitate the assembly of the battery pack 100 , and can avoid high temperature shock interference with the electrical components when thermal runaway occurs, thereby maximizing the possibility of normal operation of the electrical components, reducing the degree of damage to the battery pack 100 , and improving the maintainability and recovery rate of the battery pack 100 , so that the entire vehicle system can respond in time to ensure that the external escape system and the heat dissipation system can still operate normally, thereby reducing the occupant casualty rate.

[0096] In some embodiments of the present application, referring to Figures 7, 8 and 9, the side beam 1 and the first guard plate 2 are aluminum profiles with strong corrosion resistance, high ductility, strong plasticity, low density and light weight, which are conducive to the lightweight design of the battery pack 100.

[0097] In some embodiments of the present application, as shown in FIG6 , there are multiple first explosion-proof valves 13 , and multiple first explosion-proof valves 13 are provided at opposite ends of the side beam 1 . Heat and gas discharged from the battery cells 41 can flow out from the multiple first explosion-proof valves 13 , thereby increasing the gas discharge area, improving exhaust efficiency, and reducing the risk of incomplete exhaust or gas accumulation. Optionally, multiple first explosion-proof valves 13 can be provided at both ends of the side beam 1 along the first direction, or multiple first explosion-proof valves 13 can be provided at both ends of the side beam 1 along the second direction, or multiple first explosion-proof valves 13 can be provided at intervals in the circumferential direction of the side beam 1. In a specific example, as shown in FIG6 , two spaced-apart first explosion-proof valves 13 are provided at one end of the side beam 1 along the first direction, and three spaced-apart first explosion-proof valves 13 are provided at the other end. This can increase the gas discharge area, improve exhaust efficiency, and reduce the risk of incomplete exhaust or gas accumulation.

[0098] Other structures and operations of the battery pack 100 according to the embodiment of the present application are known to ordinary technicians in this field and will not be described in detail here.

[0099] In existing technology, electric vehicles (EVs) rely on their power battery packs for energy supply, making battery pack technology crucial for electric vehicles. Existing power battery packs offer high power and capacity, but thermal runaway can cause the packs to generate large amounts of gas and ejecta within a short period of time.

[0100] However, due to the limitations of existing battery pack structures, when thermal runaway occurs in a battery cell, a large amount of gas and ejected materials are ejected from the battery cell explosion-proof valve, but there is no dedicated exhaust path. This affects the normal operation of other components in the battery pack and may cause insulation and structural failure of electrical components (wiring harnesses, copper busbars) and structural components, greatly increasing the risk of entire pack failure caused by thermal runaway. Although some battery packs have dedicated exhaust channels for thermal runaway cells, most of these are complex and difficult to arrange.

[0101] In view of this, the present application aims to propose a battery pack to help reduce the impact of thermal runaway of battery cells on other components in the battery pack, and the structure is simple and easy to arrange and implement.

[0102] This embodiment relates to a battery pack. Overall, the battery pack comprises a housing and a battery cell 41 disposed within the housing. The housing comprises a base plate 51 and a bottom guard plate 52 positioned below the base plate 51. The base plate 51 and the bottom guard plate 52 are spaced apart to form a cavity 55. A cell explosion-proof valve 56 is provided at the bottom of the battery cell 41, and a battery pack explosion-proof valve 7 is provided on the housing. The cell explosion-proof valve 56 is electrically connected to the battery pack explosion-proof valve 7 through the cavity 55.

[0103] It can be understood that in this embodiment, a cavity 555 is formed between the bottom substrate 51 and the bottom guard plate 52, and the explosion-proof valve arranged at the bottom of the battery cell 41 can be connected to the battery pack explosion-proof valve 7 through the cavity 55, so that the gas and ejecta generated when the battery cell 41 has thermal runaway are ejected from the battery cell explosion-proof valve 56 and then discharged from the battery pack explosion-proof valve 7 through the cavity 55, thereby preventing other components in the battery pack from being affected by the high-temperature gas and ejecta generated by thermal runaway, and minimizing the impact of the thermal runaway of the battery cell 41 on the battery pack. In addition, the cavity 55 is formed between the bottom plate and the bottom guard plate 52, and the battery cell explosion-proof valve 56 is arranged at the bottom of the battery cell 41. The structure is simple and easy to arrange and implement.

[0104] Based on the above overall introduction, an exemplary structure of this embodiment is shown in Figures 10 to 13. Furthermore, as a preferred embodiment, as shown in Figures 11 and 12, in this embodiment, a high-temperature-resistant protective layer is provided on top of the bottom guard plate 52. This protects the bottom guard plate 52, preventing high-temperature gases and ejecta generated during thermal runaway of the battery cells 41 from directly impacting the inner surface of the bottom guard plate 52, thereby increasing the service life of the bottom guard plate 52. Furthermore, the bottom guard plate 52 can be a sheet metal component commonly found in the prior art, making it both readily available and easily processed.

[0105] Preferably, in this embodiment, the high-temperature-resistant protective layer is a mica plate 8 disposed on the bottom guard plate 52. This provides good protection for the bottom guard plate 52 while also providing good insulation and ease of access. Of course, the high-temperature-resistant protective layer in this embodiment can be made of other high-temperature-resistant materials commonly used in the prior art, in addition to the mica plate 8, as long as they have good high-temperature resistance.

[0106] As a preferred embodiment, as shown in Figure 11 , the battery pack explosion-proof valve 7 communicates with the cavity 55 via a flow guide 513. A flow guide channel 514 is formed on the flow guide 513. This flow guide channel 514 comprises a vertical portion 1401 communicating with the cavity 55 and a horizontal portion 1402 communicating with the battery pack explosion-proof valve 7. This facilitates communication between the cavity 55 and the battery pack explosion-proof valve 7 while ensuring that the flow guide channel 514 comprises both the horizontal portion 1402 and the vertical portion 1401, resulting in a simple structure and ease of fabrication.

[0107] Preferably, as shown in Figures 11 and 12, in this embodiment, a communication port 515 is provided on the base substrate 51, configured to connect the cell explosion-proof valve 56 and the cavity 55. A protective plate 16 is provided between the cell explosion-proof valve 56 and the communication port 515. The protective plate 16 can be destroyed by the gas and ejected materials ejected from the cell explosion-proof valve 56. It can be understood that the provision of the protective plate 16 facilitates the protection of the cell explosion-proof valve 56, preventing foreign matter that may appear in the battery pack from squeezing and damaging the cell explosion-proof valve 56.

[0108] It is worth noting that, as shown in FIG11 , in this embodiment, the protective plate 16 between each battery cell explosion-proof valve 56 and its corresponding communication port 515 is integrally formed, that is, only one integral protective plate 16 is provided in this application, thereby facilitating assembly. Of course, in the specific implementation process, multiple protective plates 16 can also be provided. In this case, each protective plate 16 can be provided corresponding to a battery cell explosion-proof valve 56 to provide protection for the battery cell 41, and each protective plate 16 is provided independently.

[0109] The protective plate 16 in this embodiment can be a PC board commonly used in the prior art, so that it can protect the battery cell explosion-proof valve 56. At the same time, when the battery cell 41 has thermal runaway, the protective plate 16 can be destroyed by the ejected material from the battery cell 41, thereby not affecting the gas and ejected material generated by the thermal runaway of the battery cell 41 from entering the cavity 55.

[0110] Furthermore, as a preferred embodiment, a protrusion is formed on the protective plate 16, protruding toward the communication port 515, and an escape space 17 is formed between the protrusion and the battery cell explosion-proof valve 56. It is understood that by forming the escape space 17 between the protrusion 1601 and the battery cell explosion-proof valve 56, the protective plate 16 will not hinder the instantaneous opening of the battery cell explosion-proof valve 56 when thermal runaway occurs in the battery cell 41, thereby facilitating the timely discharge of gases and ejecta generated by thermal runaway in the battery cell 41.

[0111] In a specific implementation, as shown in FIG13 , in this embodiment, a plurality of battery cells 41 are disposed within the housing. The battery pack further includes a busbar 9 configured to connect the terminals of each battery cell 41, and a connecting copper busbar 10 connected to the busbar 9. As will be appreciated, the provision of the busbar 9 and connecting copper busbar 10 facilitates connection of the terminals of the battery cells 41 with other electrical components within the battery pack, such as a battery management system (BMS), thereby facilitating the output of electrical energy from the battery cells 41 and the management of the battery pack.

[0112] It should be noted that, in this embodiment, the busbar 9 and the connecting copper bar 10 can be set with reference to the structure of the busbar and copper bar in the existing battery pack, and the structure of the busbar 9 and the connecting copper bar 10 will not be described in detail here.

[0113] As a preferred embodiment, as shown in FIG13 , in this embodiment, the busbar 9 and the connecting copper bar 10 are arranged on the top of the battery cell 41. It can be understood that in this embodiment, the battery cell explosion-proof valve 56 is arranged at the bottom of the battery cell 41, while the busbar 9 and the connecting copper bar 10 are arranged at the top of the battery cell 41, so as to achieve thermal and electrical separation when the battery pack is out of control.

[0114] In addition, as shown in FIG10 , in this embodiment, the housing further includes a side support beam 54 disposed on one side of the bottom substrate 51, and a high-voltage plug-in 511 and a low-voltage plug-in 512 disposed on the side support beam 54. The high-voltage plug-in 511 and the low-voltage plug-in 512 are spaced apart along the length of the side support beam 54. The battery pack explosion-proof valve 7 is disposed on the side support beam 54 and is located between the high-voltage plug-in 511 and the low-voltage plug-in 512. In a specific implementation, the high-voltage plug-in 511 can be a socket of a high-voltage connector commonly used in the prior art, and the low-voltage plug-in 512 can be a socket of a low-voltage connector commonly used in the prior art.

[0115] In addition, in this embodiment, by arranging the high-pressure plug-in 511 and the low-pressure plug-in 512 at intervals along the length direction of the side support beam 54, and setting the battery pack explosion-proof valve 7 between the high-pressure plug-in 511 and the low-pressure plug-in 512, the arrangement structure is simple and easy to implement, while helping to improve the compactness of the arrangement of various parts on the battery pack.

[0116] As shown in FIG10 , in this embodiment, two high-pressure plug-ins 511 and one low-pressure plug-in 512 are provided. The two high-pressure plug-ins 511 are respectively located near the ends of the side support beam 54 in the longitudinal direction, while the low-pressure plug-in 512 is located near the middle of the side support beam 54 in the longitudinal direction. Furthermore, two battery pack explosion-proof valves 7 are provided, one located between the high-pressure plug-in 511 and the other located between the low-pressure plug-in 512 at the ends.

[0117] It should be noted that the battery cell explosion-proof valve 56 and the battery pack explosion-proof valve 7 in this embodiment can be configured with reference to the structures of battery cell explosion-proof valves and battery pack explosion-proof valves commonly used in existing battery packs. In addition, any structures of the battery pack not mentioned in the above description can also be configured with reference to the relevant structures of existing battery packs and will not be described in detail here.

[0118] The battery pack of this embodiment allows gases and ejecta generated by thermal runaway in the battery cell 41 to be ejected from the battery cell explosion-proof valve 56 and then discharged through the battery pack explosion-proof valve 7 through the cavity 55, thus protecting other components within the battery pack from the high-temperature gases and ejecta generated by thermal runaway. The battery pack also features a simple structure, making it easy to deploy and implement. Furthermore, the busbar 9 and connecting copper busbar 10 are positioned at the top of the battery cell 41, thereby achieving thermal and electrical separation in the event of a runaway battery pack.

[0119] In the existing technology, when the battery pack of an electric vehicle experiences thermal runaway, the battery cells in the battery pack will eject high-temperature charged substances, generating a large amount of heat; these high-temperature charged substances will directly enter the internal space of the battery pack, and at the same time, will come into contact with other charged structures inside the battery pack, easily causing damage to other charged structures. If improperly protected, it is extremely easy to cause fire and explosion.

[0120] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a battery pack that can prevent high-temperature charged materials from entering the battery pack and has an explosion-proof chamber that can store and discharge high-temperature charged materials.

[0121] The battery pack 100 according to an embodiment of the present application is described below with reference to Figures 14 to 20.

[0122] As shown in Figures 14 to 20, the battery pack 100 according to the embodiment of the present application includes a battery cell 41 and a shell 62. The battery cell 41 is provided with a battery cell explosion-proof valve 56; the shell 62 includes: an upper shell 621 and a lower shell 622. The upper shell 621 and the lower shell 622 cooperate to construct an installation space. The battery cell 41 is installed in the installation space. An explosion-proof cavity 6221 is formed inside the lower shell 622. The explosion-proof cavity 6221 includes a first cavity 62211 and a second cavity 62212. The first cavity 62211 is located inside the bottom plate 223 of the lower shell 622, and the second cavity 62212 is located inside the circumferential side plate 224 of the lower shell 622. The first cavity 62211 is communicated with the second cavity 62212; an exhaust port 6222 is provided on the lower shell 622. The exhaust port 6222 is communicated with the explosion-proof cavity 6221, and the exhaust port 6222 is arranged opposite to the battery cell explosion-proof valve 56.

[0123] In this embodiment, when the battery pack 100 experiences thermal runaway, the explosion-proof cavity 6221 is configured to accommodate high-temperature charged substances ejected from the battery cells 41. This not only prevents the high-temperature charged substances from entering the interior of the battery pack 100 and causing corrosion and damage to other charged structures within the battery pack 100, but also prevents the battery pack 100 from exploding. The provision of the first cavity 62211 and the second cavity 62212 increases the overall volume of the explosion-proof cavity 6221, allowing the explosion-proof cavity 6221 to carry more high-temperature charged substances, thereby preventing the high-temperature charged substances from overflowing due to insufficient space in the explosion-proof cavity 6221. The exhaust port 6222 is configured to communicate with the explosion-proof cavity 6221 so that the high-temperature charged substances ejected from the battery cell explosion-proof valve 56 can enter the explosion-proof cavity 6221 through the exhaust port 6222. The exhaust port 6222 is opposite to the battery cell explosion-proof valve 56, thereby preventing the high-temperature charged substances from splashing or ejecting outside the exhaust port 6222.

[0124] In some embodiments, the exhaust port 6222 can be set on the bottom plate 223 and configured to connect to the first cavity 62211, and can also be set on the side plate 224 and configured to connect to the second cavity 62212. At the same time, the exhaust port 6222 can be set on both the bottom plate 223 and the side plate 224, and the battery cell explosion-proof valve 56 is always set opposite to the exhaust port 6222, and the number of the battery cell explosion-proof valves 56 is the same as the number of the exhaust ports 6222.

[0125] According to the battery pack 100 of the embodiment of the present application, an explosion-proof cavity 6221 is provided inside the lower shell 622, so that high-temperature charged substances ejected from the battery cell 41 enter the explosion-proof cavity 6221, thereby preventing the high-temperature charged substances from entering the installation space and causing damage to other charged structures inside the battery pack 100; by providing a first cavity 62211 and a second cavity 62212 inside the bottom plate 223 and the side plate 224 respectively, not only the overall volume of the explosion-proof cavity 6221 is effectively improved, but also the internal space of the lower shell 622 is fully utilized, thereby improving space utilization.

[0126] In one embodiment of the present application, as shown in Figures 14 to 20, the bottom plate 223 has a first plate body 2231 and a second plate body 2232, and the first plate body 2231 and the second plate body 2232 are spaced apart to construct a first cavity 62211. The side plate 224 has a third plate body 2241 and a fourth plate body 2242, and the third plate body 2241 and the fourth plate body 2242 are spaced apart to construct a second cavity 62212. The first plate body 2231 is arranged on a side of the second plate body 2232 close to the battery cell 41, and the third plate body 2241 is arranged on a side of the fourth plate body 2242 close to the battery cell 41. In this embodiment, the bottom plate 223 of the lower shell 622 is composed of a first plate body 2231 and a second plate body 2232, and the side plate 224 is composed of a third plate body 2241 and a fourth plate body 2242. The space between the first plate body 2231 and the second plate body 2232 constitutes a first cavity 62211, and the space between the third plate body 2241 and the fourth plate body 2242 constitutes a second cavity 62212. The first cavity 62211 and the second cavity 62212 are interconnected. Such a design not only increases the space of the explosion-proof cavity 6221, but also improves the space utilization.

[0127] In a specific embodiment of the present application, as shown in Figures 14 to 20, the third plate body 2241 surrounds the circumference of the first plate body 2231, and the fourth plate body 2242 surrounds the circumference of the second plate body 2232 to construct a second cavity 62212 surrounding the circumference of the lower shell 622. In this specific embodiment, for example, as shown in Figures 14 and 16 to 18, the lower shell 622 is designed as a double-layer structure as a whole. The first plate 2231 and the third plate 2241 arranged close to the battery cell 41 cooperate to constitute the first layer structure of the lower shell 622, and the second plate 2232 and the fourth plate 2242 arranged away from the battery cell 41 cooperate to constitute the second layer structure of the lower shell 622. The first layer structure is nested in the second layer structure. At the same time, the third plate 2241 and the fourth plate 2242 are both connected to each other in the first place and are arranged in a surrounding manner. In this way, the second cavity 62212 between the third plate 2241 and the fourth plate 2242 is arranged in a surrounding direction of the lower shell 622, effectively increasing the explosion-proof space.

[0128] In a specific embodiment of the present application, as shown in Figures 14 to 20, the exhaust port 6222 is arranged on the first plate 2231, the battery cell explosion-proof valve 56 is arranged at the bottom of the battery cell 41, a plurality of battery cells 41 are arranged along a first direction, the exhaust port 6222 extends along the first direction, and in the first direction, the battery cell explosion-proof valves 56 of the plurality of battery cells 41 are opposite to the exhaust port 6222. In this specific embodiment, the exhaust port 6222 is an elongated opening extending along the first direction, and the exhaust port 6222 is opened on the first plate 2231 arranged near the battery cell 41. In this way, the bottoms of the multiple battery cells 41 stacked along the first direction are opposite to the exhaust port 6222, and the battery cell explosion-proof valves 56 at the bottom of all battery cells 41 are also opposite to the elongated exhaust port 6222. All high-temperature charged substances ejected from the battery cell explosion-proof valves 56 can directly enter the explosion-proof cavity 6221 through the exhaust port 6222, effectively shortening the pressure relief distance. In addition, the elongated exhaust port 6222 has a large coverage area, which can ensure sufficient passability.

[0129] In a specific embodiment of the present application, as shown in Figures 14 to 20, in the second direction, at least one row of battery cells 41 is provided, and at least one exhaust port 6222 is provided. The number of rows of battery cells 41 corresponds to the number of exhaust ports 6222, and the second direction is perpendicular to the first direction. In this specific embodiment, in the second direction, only one row of battery cells 41 can be provided, or multiple rows of battery cells 41 can be provided. At the same time, one exhaust port 6222 is provided for each row of battery cells 41, and multiple exhaust ports 6222 are provided for multiple rows of battery cells 41. It is ensured that the number of rows of battery cells 41 is equal to the number of exhaust ports 6222. In this way, it can be ensured that the high-temperature charged material ejected from each battery cell 41 can enter the explosion-proof cavity 6221 through the exhaust port 6222.

[0130] In a specific embodiment of the present application, as shown in Figures 14 to 20, in the second direction, bosses 63 are provided on the first plate 2231 on both sides of the exhaust port 6222. The bosses 63 extend along the first direction, and the upper surfaces of the bosses 63 abut against the bottom surfaces of the plurality of battery cells 41 to seal the explosion-proof cavity 6221. In this specific embodiment, the provision of the bosses 63, on the one hand, can support the battery cells 41. At the same time, the bosses 63 abut against the battery cells 41 to seal the explosion-proof cavity 6221. On the other hand, it can increase the distance between the battery cell explosion-proof valve 56 and the second plate 2232 to prevent the distance from being too short, which would cause the high-temperature charged material ejected from the battery cell explosion-proof valve 56 to impact the second plate 2232 and splash onto the bottom surface of the battery cell 41, causing secondary damage to the battery cell 41.

[0131] In one specific embodiment of the present application, as shown in Figures 14 to 20, a seal is provided between the upper surface of the boss 63 and the bottom surfaces of the plurality of battery cells 41 to seal the gap between the upper surface of the boss 63 and the bottom surfaces of the battery cells 41. In this specific embodiment, the seal can effectively seal the gap between the upper surface of the boss 63 and the bottom surfaces of the battery cells 41, preventing ejected high-temperature charged materials from entering the installation space through the gap and causing corrosion and damage to other charged structures.

[0132] In some embodiments, the sealing member can be a sealing structural adhesive, a sealing ring, etc., which is not specifically limited here.

[0133] In a specific embodiment of the present application, as shown in Figures 14 to 20, in the second direction, an escape space is defined between the boss 63 and the third plate 2241, and between the bosses 63 of two adjacent exhaust ports 6222. A water-cooling plate 64 is disposed in the escape space. The water-cooling plate 64 extends along the first direction, and the upper surface of the water-cooling plate 64 is glued to the lower surfaces of the plurality of battery cells 41. In this specific embodiment, the water-cooling plate 64 can cool the battery cells 41, reducing the possibility of thermal runaway in the battery cells 41. If thermal runaway occurs in the battery pack 100, the escape space can protect the water-cooling plate 64 from damage by high-temperature charged materials, thereby reducing the degree of damage to the battery pack 100.

[0134] In one specific embodiment of the present application, as shown in Figures 14 to 20, an explosion-proof hole is provided in the lower housing 622. The explosion-proof hole is located on the second plate 2232 or the fourth plate 2242. The explosion-proof hole connects the explosion-proof chamber 6221 with the external space, and a second explosion-proof valve 225 is provided in the explosion-proof hole. In this specific embodiment, when the space in the explosion-proof chamber 6221 is completely filled with high-temperature charged material and the pressure in the explosion-proof chamber 6221 is still gradually increasing, once the pressure in the explosion-proof chamber 6221 exceeds the pressure threshold of the second explosion-proof valve 225, the second explosion-proof valve 225 will open, and the high-temperature charged material in the explosion-proof chamber 6221 will be discharged to the external space through the second explosion-proof valve 225, thereby relieving the pressure in the explosion-proof chamber 6221, preventing the explosion of the explosion-proof chamber 6221 due to excessive pressure, and enhancing the protection of the battery pack 100.

[0135] In some embodiments, multiple explosion-proof holes can be provided, and each of the multiple explosion-proof holes is provided with an explosion-proof valve, which can further improve the safety performance of the battery pack 100.

[0136] In a specific embodiment of the present application, as shown in Figures 14 to 20, the lower housing 622 includes a support member 226, which is disposed in the first cavity 62211. The upper end of the support member 226 is fixedly connected to the first plate 2231, and the lower end of the support member 226 is fixedly connected to the second plate 2232. In this specific embodiment, since the first cavity 62211 is located inside the bottom plate 223, and the bottom plate 223 carries a plurality of battery cells 41 and other charged structures, the bottom plate 223 is subjected to a large pressure, causing the first cavity 62211 to be easily deformed or collapsed. By providing the support member 226, the first cavity 62211 can be effectively supported, thereby improving the structural strength and support of the bottom plate 223 and preventing the first cavity 62211 from collapsing.

[0137] Other structures and operations of the battery pack 100 according to the embodiment of the present application are known to ordinary technicians in this field and will not be described in detail here.

[0138] This embodiment relates to a power device, which is provided with a battery pack described in any of the above embodiments.

[0139] The power device of this embodiment is provided with the battery pack described in any of the above embodiments, which helps to improve customer satisfaction with the power device.

[0140] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0141] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and intent of the present application, and that the scope of the present application is defined by the claims and their equivalents. Industrial Applicability

[0142] The first and second protective plates, as well as the air outlet passages between the first and second protective plates, can effectively reduce the risk of other components within the battery pack not being able to function properly and the entire battery pack experiencing thermal runaway due to thermal runaway of the battery cell. By allowing the gases and ejecta generated when the battery cell experiences thermal runaway to be ejected from the battery cell explosion-proof valve and then discharged through the cavity and out of the battery pack explosion-proof valve, other components within the battery pack can be protected from the effects of the high-temperature gases and ejecta generated by thermal runaway, minimizing the impact of thermal runaway on the battery pack. Furthermore, by forming the cavity between the bottom substrate and the bottom protective plate and positioning the battery cell explosion-proof valve at the bottom of the battery cell, the structure is simple and easy to arrange and implement, effectively reducing the risk of other components within the battery pack not being able to function properly and the entire battery pack experiencing thermal runaway due to thermal runaway of the battery cell. By setting up an explosion-proof cavity inside the lower shell, the high-temperature charged substances ejected from the battery cells enter the explosion-proof cavity, preventing the high-temperature charged substances from entering the installation space and causing damage to other charged structures inside the battery pack; by setting up a first cavity and a second cavity inside the bottom plate and the side plate respectively, not only the overall volume of the explosion-proof cavity is effectively improved, but also the internal space of the lower shell is fully utilized, thereby improving space utilization, and effectively reducing the risk of other components inside the battery pack not being able to be used normally and the risk of thermal runaway of the entire battery pack due to thermal runaway of the battery cells.

Claims

1. A battery pack, characterized in that: include: A side beam, wherein the side beam is formed in a ring shape, has a first cavity in the side beam, a first through hole communicating with the first cavity is provided on an outer peripheral wall of the side beam, and a first explosion-proof valve is provided in the first through hole; A first guard plate, the first guard plate is disposed at one end of the side beam in the axial direction and connected to the side beam, the first guard plate is configured to block one end of the side beam in the axial direction and define an installation space with the side beam; a second guard plate, along the axial direction of the side beam, the second guard plate and the first guard plate are arranged at the same end of the side beam and connected to the side beam, the second guard plate is located on a side of the first guard plate away from the installation space, the second guard plate is spaced apart from the first guard plate and defines an air outlet channel, the air outlet channel communicates the first cavity and the installation space; A battery module is arranged in the installation space.

2. The battery pack according to claim 1, characterized in that: A first communication hole is provided on the side beam at a position opposite to the air outlet channel, and the first communication hole communicates the first cavity and the air outlet channel.

3. The battery pack according to claim 1, characterized in that: The side beam also has a second communication hole connected to the installation space.

4. The battery pack according to claim 1, characterized in that: The battery module includes a plurality of battery cells, which are arranged in a plurality of rows along a first direction, each row of the battery cells includes a plurality of battery cells arranged along a second direction, and the first direction, the second direction and the axial direction of the side beam are perpendicular to each other.

5. The battery pack according to claim 4, characterized in that: A second cavity is defined in the first protective plate, the second cavity is communicated with the first cavity, each of the battery cells is provided with a battery cell explosion-proof valve on the side facing the first protective plate, a plurality of second through holes communicated with the air outlet channel are provided on the first protective plate, each of the second through holes is arranged opposite to at least one battery cell explosion-proof valve, the second through hole comprises a first sub-through hole and a second sub-through hole, the first sub-through hole and the second sub-through hole are arranged opposite to each other in the axial direction of the side beam, the first sub-through hole communicates with the second cavity and the installation space and is opposite to the battery cell explosion-proof valve, the second sub-through hole communicates with the air outlet channel and the second cavity.

6. The battery pack according to claim 5, characterized in that: The second cavity includes a plurality of sub-cavities arranged along the first direction, both ends of each sub-cavity along the second direction are connected to the first cavity, the plurality of sub-cavities correspond one-to-one to the plurality of rows of battery cells, each of the sub-cavities has at least one of the first sub-through hole and the second sub-through hole, and the battery cell explosion-proof valve is arranged relative to the first sub-through hole connected to the corresponding sub-cavity.

7. The battery pack according to claim 4, characterized in that: The first guard plate has a plurality of protrusions spaced apart along the first direction on one side thereof facing the installation space, each of the protrusions extends along the second direction, and any protrusion is located between two adjacent rows of the battery cells.

8. The battery pack according to claim 1, characterized in that: The installation space has a crossbeam, and both ends of the crossbeam in the length direction are respectively connected to the side beams. The installation space includes a first installation space and a second installation space located on both sides of the crossbeam. The battery module is arranged in the first installation space, and the electrical device is arranged in the second installation space. The side beam and the first guard plate are aluminum profiles; There are multiple first explosion-proof valves, and the multiple first explosion-proof valves are arranged at two opposite ends of the side beam.

9. A battery pack, characterized in that: It comprises a shell, and a battery cell arranged in the shell; The housing comprises a bottom substrate and a bottom guard plate located below the bottom substrate, wherein the bottom substrate and the bottom guard plate are arranged at intervals to form a cavity; A battery cell explosion-proof valve is provided at the bottom of the battery cell, and a battery pack explosion-proof valve is provided on the shell. The battery cell explosion-proof valve can be connected to the battery pack explosion-proof valve through the cavity.

10. The battery pack according to claim 9, characterized in that: A high temperature resistant protective layer is provided on the top of the bottom guard plate; The high temperature resistant protective layer is a mica plate arranged on the bottom guard plate.

11. The battery pack according to claim 9, characterized in that: The battery pack explosion-proof valve is connected to the cavity via a flow guide; A flow guiding channel is formed on the flow guiding member, and the flow guiding channel has a vertical portion communicating with the cavity, and a horizontal portion communicating with the explosion-proof valve of the battery pack.

12. The battery pack according to claim 9, characterized in that: The bottom substrate is provided with a communication port configured to connect the battery cell explosion-proof valve and the cavity, and a protective plate is provided between the battery cell explosion-proof valve and the communication port, and the protective plate can be destroyed by the gas and ejected material ejected from the battery cell explosion-proof valve.

13. The battery pack according to claim 12, characterized in that: A protrusion is formed on the protection plate and protrudes toward the communication port, and an escape space is formed between the protrusion and the battery core explosion-proof valve.

14. The battery pack according to claim 9, characterized in that: The battery cells are multiple and are arranged in the housing; The battery pack further comprises a busbar configured to connect the poles of each of the battery cells, and a connecting copper bar connected to the busbar; The busbar and the connecting copper bar are arranged on the top of the battery core.

15. The battery pack according to claim 9, characterized in that: The housing further comprises a side support beam disposed on one side of the bottom substrate, a high-pressure plug-in and a low-pressure plug-in are disposed on the side support beam, and the high-pressure plug-in and the low-pressure plug-in are arranged at intervals along the length direction of the side support beam; The battery pack explosion-proof valve is arranged on the side support beam and is located between the high-voltage plug-in and the low-voltage plug-in.

16. A battery pack, characterized in that: include: A battery cell, wherein the battery cell is provided with a battery cell explosion-proof valve; A housing, the housing comprising: an upper housing and a lower housing, the upper housing cooperates with the lower housing to construct an installation space, the battery cell is installed in the installation space, an explosion-proof cavity is formed inside the lower housing, the explosion-proof cavity comprises a first cavity and a second cavity, the first cavity is located inside the bottom plate of the lower housing, the second cavity is located inside the circumferential side plate of the lower housing, and the first cavity is communicated with the second cavity; The lower shell is provided with an exhaust port, the exhaust port is communicated with the explosion-proof cavity, and the exhaust port is arranged opposite to the battery core explosion-proof valve.

17. The battery pack according to claim 16, characterized in that: The bottom plate has a first plate body and a second plate body, the first plate body is spaced apart from the second plate body to construct the first cavity, the side plate has a third plate body and a fourth plate body, the third plate body is spaced apart from the fourth plate body to construct the second cavity, the first plate body is arranged on a side of the second plate body close to the battery cell, and the third plate body is arranged on a side of the fourth plate body close to the battery cell.

18. The battery pack according to claim 17, characterized in that: The third plate body surrounds the first plate body in the circumferential direction, and the fourth plate body surrounds the second plate body in the circumferential direction, so as to construct the second cavity surrounding the lower shell in the circumferential direction.

19. The battery pack according to claim 17, characterized in that: The exhaust port is arranged on the first plate body, the battery cell explosion-proof valve is arranged at the bottom of the battery cell, a plurality of the battery cells are arranged along a first direction, the exhaust port extends along the first direction, and in the first direction, the battery cell explosion-proof valves of the plurality of the battery cells are opposite to the exhaust port.

20. The battery pack according to claim 19, characterized in that: In the second direction, the battery cells are arranged in at least one row, the exhaust port is arranged in at least one row, the number of rows of the battery cells corresponds to the number of the exhaust ports, and the second direction is perpendicular to the first direction.

21. The battery pack according to claim 20, characterized in that: In the second direction, bosses are provided on the first plate body at both sides of the exhaust port, the bosses extend along the first direction, and the upper surfaces of the bosses abut against the bottom surfaces of the plurality of battery cells to close the explosion-proof cavity.

22. The battery pack according to claim 21, characterized in that: A sealing member is arranged between the upper surface of the boss and the bottom surfaces of the plurality of battery cells to seal the gap between the upper surface of the boss and the bottom surfaces of the battery cells.

23. The battery pack according to claim 21, characterized in that: In the second direction, an escape space is defined between the boss and the third plate body and between the bosses of two adjacent exhaust ports, and a water cooling plate is arranged in the escape space. The water cooling plate extends along the first direction, and the upper surface of the water cooling plate is glued to the lower surfaces of the plurality of battery cells.

24. The battery pack according to claim 17, characterized in that: An explosion-proof hole is provided on the lower shell, the explosion-proof hole is located on the second plate body or the fourth plate body, the explosion-proof hole connects the explosion-proof cavity and the external space, and a second explosion-proof valve is provided in the explosion-proof hole; The lower shell includes a support member, which is disposed in the first cavity. The upper end of the support member is fixedly connected to the first plate body, and the lower end of the support member is fixedly connected to the second plate body.

25. A power device, characterized in that: The power device is provided with a battery pack according to any one of claims 1 to 24.

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