Battery pack and electric equipment

Abstract

The invention relates to the technical field of batteries, and provides a battery pack and electric equipment, the battery pack comprises a box body, a battery cell module and an internal frame, the box body is provided with a first explosion-proof valve, the battery cell module is arranged in the box body, the battery cell module comprises a plurality of battery cell units, each battery cell unit comprises a second explosion-proof valve, and the second explosion-proof valve is arranged in the box body. The inner frame is arranged in the box body and surrounds the periphery of the battery cell module, the inner frame is provided with an inner cavity, and the second anti-explosion valve, the inner cavity and the first anti-explosion valve can form a communicated pressure relief channel. According to the embodiment of the invention, the safety performance of the battery pack can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and particularly to a battery pack and an electrical device. Background Art

[0002] The battery cell module of the battery pack is housed in the box body of the battery pack. An explosion-proof valve is provided on the box body. When the temperature inside the box body rises due to thermal runaway of the battery cell module, the high-temperature gas can blow open the explosion-proof valve to achieve the purpose of pressure relief, thereby protecting the battery pack.

[0003] The battery cell module usually includes a plurality of battery cell units, and each battery cell unit is also configured with an explosion-proof valve. When a single battery cell undergoes thermal runaway, the explosion-proof valve of the battery cell will open, and intense flames, high-temperature gases, molten metal particles, electrolyte and other high-temperature substances will be ejected from the explosion-proof valve. These substances are extremely likely to fall onto adjacent battery cell units or the electrical area inside the box body, easily generating an arc phenomenon and causing thermal diffusion between adjacent battery cell units, triggering a chain reaction, and resulting in the explosion and fire of the battery pack.

[0004] In summary, the current structural design of the battery pack has relatively large potential safety hazards. Summary of the Invention

[0005] The present application provides a battery pack and an electrical device, which can improve the safety performance of the battery pack.

[0006] In the first aspect of the present application, a battery pack is provided, including:

[0007] A box body, on which a first explosion-proof valve is provided;

[0008] A battery cell module, arranged in the box body, the battery cell module includes a plurality of battery cell units, and the battery cell units include second explosion-proof valves;

[0009] And an internal frame, arranged in the box body and surrounding the outer periphery of the battery cell module, the internal frame has an internal cavity, and the second explosion-proof valve, the internal cavity and the first explosion-proof valve can form a connected pressure relief channel.

[0010] According to the battery pack described in the first aspect of the present application, when a thermal runaway occurs in a battery cell module or a certain one or some battery cell units in the battery cell module, the high-temperature substance can push open the second explosion-proof valve on the battery cell unit and enter the internal cavity of the internal frame, and then transmit along the internal cavity until it pushes open the first explosion-proof valve, thereby achieving the purpose of discharging the high-temperature substance from the battery pack. In the above process, the second explosion-proof valve, the internal cavity, and the first explosion-proof valve can be connected to form a pressure relief channel, and the high-temperature substance can be discharged from the battery pack along the pressure relief channel. The high-temperature substance will not interfere with adjacent battery cell modules or battery cell units during the transmission process, thus well solving the problem of thermal diffusion and improving the safety performance of the battery pack. On the other hand, the transmission of the high-temperature substance only occurs between the internal frame and the battery cell module. Based on the design method of the internal frame surrounding the battery cell module, the high-temperature substance will not enter the electrical area inside the box body, which can ensure the stability of the electrical performance of the battery pack.

[0011] In a possible implementation manner, the internal frame includes a pair of longitudinal beams and a plurality of cross beams arranged between the pair of longitudinal beams. The cross beam forms a first cavity inside it, and the longitudinal beam forms a second cavity inside it that communicates with the first cavity. The cross beam can communicate with the second explosion-proof valve, and the longitudinal beam and / or the cross beam can communicate with the first explosion-proof valve.

[0012] In a possible implementation manner, the cross beam is formed with a plurality of pressure relief inlets corresponding to the second explosion-proof valve along its length direction, and the cross beam is provided with pressure relief outlets at both ends thereof that communicate with the second cavity.

[0013] In a possible implementation manner, the cross beam includes end beams and intermediate beams. The end beams are connected to the ends of the longitudinal beams, the intermediate beams are arranged between the end beams, and the end beams are provided with pressure discharge ports on the side facing away from the pressure relief inlets, and the pressure discharge ports can communicate with the first explosion-proof valve.

[0014] In a possible implementation manner, the internal frame further includes spacer beams arranged parallel to the longitudinal beams.

[0015] In a possible implementation manner, the battery cell module includes:

[0016] A battery cell assembly including a plurality of the battery cell units;

[0017] And a cover structure provided on at least one side of the battery cell assembly, and the cover structure forms a separation structure that separates each second explosion-proof valve.

[0018] In a possible implementation manner, the cover structure includes:

[0019] An integrated end plate is connected to at least one side of the battery cell assembly, and the integrated end plate is provided with an enclosing area corresponding to the second explosion-proof valve;

[0020] And a covering structure covers the enclosing area for separating each of the second explosion-proof valves.

[0021] In a possible implementation manner, the covering structure includes an explosion-proof valve side cover and a protection cover plate. The explosion-proof valve side cover includes a plurality of isolation structures, and the plurality of isolation structures correspondingly cover the plurality of enclosing areas. The protection cover plate is connected to the outer side of the explosion-proof valve side cover.

[0022] In a possible implementation manner, an electrical area for installing electrical components is formed inside the box body, and the electrical area is located between the inner frame and the box body.

[0023] In a possible implementation manner, the box body includes a tray and a box cover. The box cover is hermetically covered on the tray. The battery pack further includes a sealing structure, and the sealing structure is arranged between the tray and the box cover.

[0024] In a possible implementation manner, the sealing structure includes a first sealing ring and a second sealing ring. The first sealing ring is arranged between the tray and the box cover, and the second sealing ring is arranged between the inner frame and the box cover.

[0025] A second aspect of the present application provides an electrical device including the battery pack described in the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0027] Figure 1 Fig. shows an exploded view of a battery pack provided according to an embodiment of the present application;

[0028] Figure 2 Fig. shows a layout diagram of a pressure relief channel provided according to an embodiment of the present application;

[0029] Figure 3 Fig. shows a structural diagram of a cross beam provided according to an embodiment of the present application;

[0030] Figure 4 Fig. shows a cross-sectional view of a cross beam provided according to an embodiment of the present application;

[0031] Figure 5 An exploded schematic diagram of a battery cell module provided according to an embodiment of the present application is shown;

[0032] Figure 6 The figure shows the internal structure of a battery pack provided according to an embodiment of the present application.

[0033] Reference numerals:

[0034] 100-box body; 101-electrical area; 110-tray; 120-box cover; 130-first explosion-proof valve; 111-peripheral wall; 112-bottom wall; 1111-first peripheral wall; 1112-second peripheral wall; 1113-third peripheral wall; 1114-fourth peripheral wall;

[0035] 200-battery module; 201-battery unit; 202-second explosion-proof valve; 210-battery assembly; 220-cover structure; 221-isolation structure; 222-integrated end plate; 223-explosion-proof valve side cover; 224-protective cover; 2221-enclosing area;

[0036] 300-internal frame; 301-internal cavity; 302-module installation area; 310-longitudinal beam; 320-cross beam; 330-interval beam; 320a-end beam; 320b-middle beam; 321-first cavity; 322-pressure relief inlet; 323-pressure relief outlet; 320b1-partition plate;

[0037] 400-Electrical components;

[0038] 500 - sealing structure; 510 - first sealing ring; 520 - second sealing ring; 521 - transverse part; 522 - longitudinal part. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution 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 ordinary technicians in this field without creative work are within the scope of protection of this application.

[0040] With the rapid development of new energy vehicle technology, battery packs as the power components of new energy vehicles are receiving more and more attention. As new energy vehicles continue to improve their endurance and fast charging performance, battery packs are facing increasing challenges in terms of safety and endurance.

[0041] Thermal runaway of the battery pack is one of the important factors affecting the safety of the battery pack. When thermal runaway occurs in the battery pack, its internal temperature rises sharply, and in severe cases, an explosion may even occur.

[0042] A battery pack usually includes a case and a battery cell module. The battery cell module is housed in the case of the battery pack. An explosion-proof valve is provided on the case. When the battery cell module suffers from thermal runaway or other conditions that cause the temperature inside the case to rise, the high-temperature gas can rush open the explosion-proof valve to achieve the purpose of pressure relief, thereby protecting the battery pack.

[0043] The explosion-proof valve installed on the box can relieve the pressure in the box, which is a unified pressure relief structural design, that is, the high-temperature gas generated by the battery module as a whole can be discharged from the box through the explosion-proof valve. This pressure relief method is less targeted and cannot solve the heat diffusion phenomenon in the battery module. The current structural design of the battery pack has a great safety hazard.

[0044] Specifically, a battery cell module usually includes multiple battery cell units, and each battery cell unit is also equipped with an explosion-proof valve. When a single battery cell experiences thermal runaway, the explosion-proof valve of the battery cell will open, and violent flames, high-temperature gases, molten metal particles, electrolyte and other high-temperature substances will spew out from the explosion-proof valve. These substances can easily fall into adjacent battery cell units or the electrical area inside the box, easily causing arcing and causing heat diffusion between adjacent battery cell units, triggering a chain reaction, and causing the battery pack to explode and catch fire.

[0045] Based on the above-mentioned status quo and problems, an embodiment of the present application provides a battery pack, which is provided with an internal frame in a box body, and the internal frame is arranged to surround a battery cell module. The internal frame can form a pressure relief channel with the battery cell module or each battery cell unit in the battery cell module. When thermal runaway occurs in the battery cell module or each battery cell unit, the high-temperature substance generated by the battery cell unit can be discharged into the explosion-proof valve on the box body through the pressure relief channel, thereby completing the pressure relief.

[0046] Figure 1 A schematic diagram of an explosion of a battery pack provided according to an embodiment of the present application is shown; Figure 2 A schematic diagram of the arrangement of a pressure relief channel provided according to an embodiment of the present application is shown.

[0047] In the examples of this application, please refer to Figures 1 to 2 The battery pack includes a box body 100, a battery cell module 200 and an internal frame 300.

[0048] The box 100 is a protective shell of the battery pack, and the box 100 can generally be made of metal materials, such as aluminum, etc. The box 100 can be designed to include a tray 110 and a box cover 120, wherein the box cover 120 can be covered on the tray 110, and the box cover 120 and the tray 110 can form a receiving cavity, and the battery cell module 200, the internal frame 300, the electrical components, etc. of the battery pack can be arranged in the receiving cavity.

[0049] It can be known from the following embodiments that the battery pack may further include a sealing structure 500, which may be disposed between the box cover 120 and the tray 110, or between the box cover 120 and the internal frame 300. The function of the sealing structure 500 is to seal the battery cell module 200, the electrical component 400, etc. in the receiving cavity.

[0050] The battery module 200 is disposed in the box 100. The battery module 200 may include a plurality of battery units 201. The battery unit 201 includes a second explosion-proof valve 202 (see Figure 5 ).

[0051] The battery cell module 200 is a module structure formed by connecting a plurality of battery cell units 201 . For example, the battery cell module 200 may include a plurality of square battery cells, and the square battery cells may be connected in sequence to form the battery cell module 200 .

[0052] The battery cell unit 201 in the embodiment of the present application can be selected according to actual needs. For example, the battery cell unit 201 may include a shell, a pole core arranged in the shell, and a cover structure 220. The second explosion-proof valve 202, a liquid injection structure, etc. can be arranged on the cover structure 220.

[0053] by Figure 1 Taking the illustrated orientation as an example, the battery cell module 200 includes a plurality of battery cell units 201 arranged along the width direction of the box body 100 , where the width direction is the Y direction.

[0054] It should be noted that there is no limit on the number of battery cell modules 200 in the battery pack. Figure 1 In the example shown, the battery pack includes a total of 10 battery cell modules 200 , and each battery cell module 200 is arranged in two rows along the X direction, and each row includes 5 battery cell modules 200 .

[0055] There is a gap between each battery module 200, which can prevent heat diffusion between two or more adjacent battery modules 200 to a certain extent. It can be known from the following embodiments that the gap also facilitates the installation of the internal frame 300. Specifically, the cross beam 320 and the spacing beam 330 of the internal frame 300 can be located in the gap.

[0056] The internal frame 300 is disposed in the box body 100 and surrounds the outer periphery of the battery module 200 . The internal frame 300 has an internal cavity 301 . The second explosion-proof valve 202 , the internal cavity 301 and the first explosion-proof valve 130 can form a communicating pressure relief channel.

[0057] In the embodiment of the present application, when thermal runaway occurs in the battery cell module 200 or one or some of the battery cell units 201 in the battery cell module 200, the high-temperature substance can break through the second explosion-proof valve 202 on the battery cell unit 201 and enter the internal cavity 301 of the internal frame 300, and then be transmitted along the internal cavity 301 until the first explosion-proof valve 130 is broken, thereby achieving the purpose of discharging the high-temperature substance from the battery pack. In the above process, the second explosion-proof valve 202, the internal cavity 301 and the first explosion-proof valve 130 can be connected and form a pressure relief channel, and the high-temperature substance can be discharged from the battery pack along the pressure relief channel. The high-temperature substance will not interfere with the adjacent battery cell module 200 or battery cell unit 201 during the transmission process, thereby solving the problem of heat diffusion well and improving the safety performance of the battery pack. On the other hand, the transmission of high-temperature substances will only take place between the internal frame 300 and the battery cell module 200. Based on the design of the internal frame 300 surrounding the battery cell module 200, high-temperature substances will not enter the electrical area 101 in the box 100, thereby ensuring the stability of the electrical performance of the battery pack.

[0058] In the embodiment of the present application, the internal frame 300 may be designed into a variety of structures according to the different battery modules 200 and the arrangement of the battery modules 200. Figure 1 In the example shown, the battery cell modules 200 are arranged in two rows along the X direction, and the battery cell modules 200 are arranged in a rectangular shape as a whole. Correspondingly, the internal frame 300 can also be designed as a rectangular structure.

[0059] For ease of description and understanding, the following embodiments will be described in Figure 1 The structure of the internal frame 300 is described by taking the arrangement of the battery cell modules 200 as an example. It should be understood that when the arrangement of the battery cell modules 200 changes, the internal frame 300 can also be adaptively adjusted.

[0060] In some embodiments, please refer to Figure 1 and Figures 3 to 4 The internal frame 300 includes a pair of longitudinal beams 310 and a plurality of cross beams 320 arranged between the pair of longitudinal beams 310. The cross beam 320 has a first cavity 321 formed therein, and the longitudinal beam 310 has a second cavity connected to the first cavity 321 formed therein. The cross beam 320 can be connected to the second explosion-proof valve 202, and the longitudinal beam 310 can be connected to the first explosion-proof valve 130.

[0061] Combination Figure 1As shown in the orientation, it can be understood that the longitudinal beam 310 extends along the X direction, the cross beam 320 extends along the Y direction, and a module installation area 302 is formed between two adjacent cross beams 320. The aforementioned battery module 200 can be installed in each module installation area 302. The position of the cross beam 320 can correspond to the second explosion-proof valve 202 of the battery cell unit 201. The second explosion-proof valve 202 can be connected with the first cavity 321 of the cross beam 320. High-temperature substances can be transmitted from the battery cell unit 201 to the cross beam 320, and then based on the connection setting between the first cavity 321 and the second cavity, the high-temperature substances can be transmitted from the cross beam 320 to the longitudinal beam 310. Based on the connection setting between the second cavity and the first explosion-proof valve 130, the high-temperature substances can finally be discharged from the battery pack.

[0062] It is understandable that in the above embodiment, the high-temperature material is eventually discharged from the battery pack by the longitudinal beam 310 and through the first explosion-proof valve 130 . It is understandable that the second cavity of the longitudinal beam 310 needs to be connected to the first explosion-proof valve 130 .

[0063] Please refer to Figure 2 For each crossbeam 320, the high-temperature material in the battery cell module 200 located on one side of the crossbeam 320 can enter the crossbeam 320 along the U1 direction or the U2 direction, and then enter the pair of longitudinal beams 310 along the W1 direction or the W2 direction, and then enter the first explosion-proof valve 130 along the V direction on the longitudinal beam 310, and then be discharged from the battery pack.

[0064] In other embodiments, the high-temperature material may also eventually be discharged from the battery pack through the cross beam 320 and the first explosion-proof valve 130 . In this case, the longitudinal beam 310 may play the role of collecting the high-temperature material.

[0065] For example, the internal frame 300 includes a pair of longitudinal beams 310 and a plurality of cross beams 320 arranged between the pair of longitudinal beams 310, the cross beams 320 have a first cavity 321 formed therein, the longitudinal beams 310 have a second cavity connected to the first cavity 321 formed therein, a cross beam outlet that can be connected to the first explosion-proof valve 130 is formed on the cross beam 320 near the first explosion-proof valve 130, and the cross beam 320 can be connected to the second explosion-proof valve 202.

[0066] At this time, when a battery cell 201 experiences thermal runaway, the high-temperature substance can break through the second explosion-proof valve 202 and enter the crossbeam 320. The high-temperature substance that enters the crossbeam 320 will gather in the longitudinal beam 310 and be transported along the second cavity in the longitudinal beam 310 to the crossbeam 320 close to the first explosion-proof valve 130, and then be transmitted to the first explosion-proof valve 130 through the crossbeam 320 outlet on the crossbeam 320 and discharged from the battery pack.

[0067] In the above embodiment, the cross beam 320 close to the first explosion-proof valve 130 needs to be connected to the longitudinal beam 310 and the first explosion-proof valve 130 , while other cross beams 320 only need to be connected to the longitudinal beam 310 and the second explosion-proof valve 202 .

[0068] Figure 3 A schematic structural diagram of a crossbeam provided according to an embodiment of the present application is shown; Figure 4 A cross-sectional view of a beam provided according to an embodiment of the present application is shown.

[0069] In some embodiments, please refer to Figure 3 and Figure 4 The cross beam 320 is formed with a plurality of pressure relief inlets 322 corresponding to the second explosion-proof valve 202 along its length direction, and the cross beam 320 is provided with pressure relief outlets 323 communicating with the second cavity at both ends thereof.

[0070] Combined with the foregoing, the length direction here refers to the Y direction, and the number of pressure relief inlets 322 is the same as the number of battery cell units 201. When a battery cell unit 201 has thermal runaway, high-temperature substances can enter the crossbeam 320 through the second explosion-proof valve 202 and the corresponding pressure relief inlet 322, and then enter the longitudinal beam 310 through the pressure relief outlet 323.

[0071] In some embodiments, please refer to Figure 1 The cross beam 320 includes an end beam 320a and an intermediate beam 320b. The end beam 320a is connected to the end of the longitudinal beam 310, and the intermediate beam 320b is arranged between the end beams 320a. The end beam 320a is provided with a pressure discharge port on the side away from the pressure relief inlet 322, and the pressure discharge port can be connected to the first explosion-proof valve 130.

[0072] In combination with the above, the end beam 320a here is the beam 320 close to the first explosion-proof valve 130, the middle beam 320b is the other beams 320, and the pressure discharge port is the beam outlet mentioned above.

[0073] In some embodiments, please refer to Figure 1 The internal frame 300 also includes a spacing beam 330 arranged parallel to the longitudinal beam 310. The spacing beam 330 can be arranged between two battery cell modules 200 arranged at intervals along the Y direction. The spacing beam 330 can separate the battery cell modules 200. The spacing beam 330 can also increase the overall structural strength of the internal frame 300.

[0074] In the aforementioned embodiment, the internal frame 300 surrounds the outer periphery of the battery cell module 200. The internal frame 300 is in the high temperature environment of the battery pack. The internal frame 300 can be made of high temperature resistant materials, such as aluminum or steel.

[0075] In addition, according to the above description, it can be known that after the high-temperature material breaks through the second explosion-proof valve 202 and the first explosion-proof valve, a pressure relief channel can be formed between the second explosion-proof valve 202, the internal cavity 301 of the internal frame 300 and the first explosion-proof valve 130. In order to ensure that the high-temperature material can break through the first explosion-proof valve and the second explosion-proof valve 202 in time, a weak structure can be set on the first explosion-proof valve 130 and the second explosion-proof valve 202. For example, the weak structure can be a thinning area, or it can be a notch, etc.

[0076] In addition, the pressure relief inlet 322 and / or the pressure relief outlet 323 formed on the crossbeam 320 may also be replaced by a weak structure, and does not necessarily have to be an open structure.

[0077] In addition, in combination with the above, the cross beam 320 includes an end beam 320a and a middle beam 320b, wherein the battery cell modules 200 are arranged on both sides of the middle beam 320b, therefore, for the middle beam 320b, the pressure relief inlet 322 can be formed on both sides of the middle beam 320b, so that the middle beam 320b can be connected with the battery cell modules 200 on both sides. For the end beam 320a, the battery cell module 200 is only arranged on one side of the end beam 320a, therefore, the pressure relief inlet 322 can be formed on one side of the end beam 320a.

[0078] In some embodiments, a partition 320b1 is disposed at the lower end of the middle beam 320b, and the partition 320b1 can prevent high-temperature substances such as flames from erupting after thermal runaway from causing heat diffusion to the adjacent battery cell units 201.

[0079] Figure 5 An exploded schematic diagram of a battery cell module 200 provided according to an embodiment of the present application is shown.

[0080] In some embodiments, please refer to Figure 1 and Figure 5 The battery cell module 200 includes a battery cell assembly 210 and a cover structure 220. The battery cell assembly 210 is a combination of multiple battery cell units 201. The battery cell assembly 210 includes multiple battery cell units 201. The cover structure 220 is arranged on at least one side of the battery cell assembly 210. The cover structure 220 forms an isolation structure 221 that separates each second explosion-proof valve 202.

[0081] It is understandable that, for the battery cell assembly 210, when a battery cell unit 201 thereof experiences thermal runaway, high-temperature material is easily sprayed out from the corresponding second explosion-proof valve 202 and spreads to other adjacent battery cell units 201. The cover structure 220 can separate the second explosion-proof valves 202 through the setting of the isolation structure 221, thereby preventing heat diffusion between multiple battery cell units 201.

[0082] In some specific embodiments, please refer to Figure 5 The cover plate structure 220 includes an integrated end plate and a covering structure. The integrated end plate is connected to at least one side of the battery cell assembly 210. The integrated end plate is provided with an enclosing area 2221 corresponding to the second explosion-proof valve 202. The covering structure covers the enclosing area 2221 and is used to isolate each second explosion-proof valve 202.

[0083] The integrated end plate is adapted to one side of the battery cell assembly 210 in terms of structure and size. Figure 1 , one side of the battery cell assembly 210 refers to one side of the battery cell assembly 210 along the X direction. The integrated end plate can be nested on each battery cell unit 201, so that the related structures of each battery cell unit 201, for example, the second explosion-proof valve 202 and the liquid injection structure on the battery cell unit 201 can be surrounded by the enclosing area 2221.

[0084] The enclosing structure covering the enclosing area 2221 can be set corresponding to the enclosing area 2221. The enclosing structure can be designed into multiple independent structures. Of course, in some embodiments, please refer to Figure 5 The covering structure may also be an integral plate-like structure, and at the same time, a related structure corresponding to the enclosing area 2221 is arranged on the plate-like structure.

[0085] It can be understood that the structure on the covering structure used to cooperate with covering each surrounding area 2221 together with the surrounding area 2221 can form the above-mentioned isolation structure 221.

[0086] In some specific embodiments, please refer to Figure 5 The covering structure includes an explosion-proof valve side cover 223 , and the explosion-proof valve side cover 223 includes a plurality of isolation structures 221 , and the plurality of isolation structures 221 correspondingly cover a plurality of enclosing areas 2221 .

[0087] The explosion-proof valve side cover 223 is arranged on the outside of the integrated end plate. The explosion-proof valve side cover 223 can be formed into a plurality of sub-cavities by stamping, and each sub-cavity can form an isolation structure 221 .

[0088] Since the explosion-proof valve side cover 223 needs to isolate each second explosion-proof valve 202, the explosion-proof valve side cover 223 can be made of an insulating high-temperature resistant material, such as ceramic, mica, etc.

[0089] In some specific embodiments, please refer to Figure 5 The covering structure further includes a protective cover plate 224, which is connected to the outside of the explosion-proof valve side cover 223. The protective cover plate 224 can be made of a high-temperature resistant non-metallic material, and the protective cover plate 224 can protect the explosion-proof valve side cover 223, the integrated end plate 222, etc. The protective cover plate 224 can be designed to expose the explosion-proof valve side cover 223.

[0090] In the above embodiment, the second explosion-proof valve 202 on the battery cell unit 201 is covered by the integrated end plate and the explosion-proof valve side cover 223. While ensuring that high-temperature substances can break through the integrated end plate and the explosion-proof valve side cover 223 in the event of thermal runaway, a weak structure can be set at the position of the integrated end plate and the explosion-proof valve side cover 223 corresponding to the second explosion-proof valve 202. The weak structure can be designed with reference to the previous text and will not be repeated here.

[0091] Figure 6 The figure shows the internal structure of a battery pack provided according to an embodiment of the present application.

[0092] In some embodiments, please refer to Figure 6 An electrical area 101 for installing an electrical component 400 is formed in the box 100. The electrical component 400 may be a distribution box or other structure, for example. The electrical area 101 is located between the internal frame 300 and the box 100.

[0093] In combination with the aforementioned embodiment, the internal frame 300 surrounds the outer periphery of the battery cell module 200, and the battery cell module 200 can be installed in the area surrounded by the internal frame 300 in the box body 100, and the area outside the internal frame 300 in the box body 100 can be understood as the electrical area 101. It can be understood that based on the setting of the internal frame 300, high-temperature substances will be transmitted between the internal frame 300 and the first explosion-proof valve 130. The electrical area 101 is located at the other end of the first explosion-proof valve 130, thereby preventing high-temperature substances from being transmitted to the electrical area 101 and damaging the electrical components 400, thereby ensuring the stability of the electrical performance of the battery pack.

[0094] In conjunction with the above, please refer to Figure 1 The battery pack in the embodiment of the present application is also configured with a sealing structure 500, which can be arranged between the box cover and the tray 110. Specifically, the sealing structure 500 may include a first sealing ring 510 and a second sealing ring 520. The first sealing ring 510 is arranged between the tray 110 and the box cover, and the second sealing ring 520 is arranged between the internal frame 300 and the box cover.

[0095] by Figure 1 Taking the shown orientation as an example, the box cover and the tray 110 can be overlapped in the Z direction. After the box cover 120 is closed on the tray 110, the battery cell module 200, the internal frame 300 and the electrical components 400 are confined in the box body 100, wherein the internal frame 300 and the peripheral wall 111 of the tray 110 form a two-circle structure, and the structure formed by the peripheral wall 111 is located on the outer periphery of the structure formed by the internal frame 300. In order to improve the sealing performance, a sealing ring can be set for the peripheral wall 111 and the internal frame 300, the former is the first sealing ring 510, and the latter is the second sealing ring 520.

[0096] It can be understood that, for the surrounding wall 111 or the internal frame 300, a circle of top wall structure is formed, and the first sealing ring 510 and the second sealing ring 520 can be designed to be able to snap into the top wall structure. For example, the first sealing ring 510 and the second sealing ring 520 can form a groove, so that the first seal and the second seal can be snapped into the top wall structure, thereby improving the sealing effect.

[0097] In some embodiments, please refer to Figure 1 The first sealing ring 510 can be configured as a single-ring annular structure so that it can be adapted and installed on the top wall structure of the tray 110 .

[0098] In some embodiments, please refer to Figure 1 The second sealing ring 520 can be designed according to the specific structure of the internal frame 300. For example, in the aforementioned embodiment, the internal frame 300 includes a longitudinal beam 310 and a plurality of transverse beams 320. Correspondingly, the second sealing ring 520 can be configured to include a transverse portion 521 corresponding to the longitudinal beam 310 and a longitudinal portion 522 corresponding to the transverse beam 320. In addition to being able to seal the battery module 200, the second sealing ring 520 can also seal and isolate the battery module 200 from the electrical component 400, and can separate the electrical area 101 from the module installation area 302, thereby improving the electrical safety performance and preventing the battery module 200 in the module installation area 302 from thermal runaway and high-temperature gas, flame, charged substances, etc. from spreading to the electrical area 101, causing further electrical arcing, insulation alarm signal interruption, and other hazards.

[0099] In the embodiment of the present application, the tray 110 is a bearing component of the battery module 200 and other structures. To ensure its bearing capacity, the tray 110 can be made of metal materials such as aluminum.

[0100] In addition, in order to improve the heat dissipation performance of the battery pack, various components of the tray 110, such as the peripheral wall 111, can be designed to have a cavity, thereby improving the heat dissipation capacity of the battery pack.

[0101] The tray 110 can be manufactured by an integral molding method or a split molding method. Taking the latter as an example, the tray 110 can include a bottom wall 112 and the peripheral wall 111, and the peripheral wall 111 can be connected to the bottom wall 112 by mechanical connection or welding. As for the peripheral wall 111, the peripheral wall 111 can include a first peripheral wall 1111, a second peripheral wall 1112, a third peripheral wall 1113 and a fourth peripheral wall 1114, and the first peripheral wall 1111, the second peripheral wall 1112, the third peripheral wall 1113 and the fourth peripheral wall 1114 can be connected by welding.

[0102] In the embodiment of the present application, the box cover 120 can be installed on the frame of the vehicle. Therefore, in order to achieve connection with the frame and ensure that there is a good rigidity connection and strength connection between the box cover and the frame, reinforcing ribs or force transmission grooves and other structures can be provided on the box cover, which can achieve a good force transmission effect and prevent the box cover from being deformed or damaged due to excessive local force.

[0103] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0104] In the description of the present application, it should be understood that the terms "including" and "having" and any variations thereof used in the embodiments of the present application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or apparatuses.

[0105] Unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense, for example, it can be a fixed connection, it can also be a detachable connection, or it can be integrated; it can be directly connected, or it can be indirectly connected through an intermediate medium, it can make the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances. In addition, the terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated.

[0106] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery pack, characterized in that: include: A box body, wherein a first explosion-proof valve is provided on the box body; A battery cell module is arranged in the box, the battery cell module includes a plurality of battery cell units, and the battery cell unit includes a second explosion-proof valve; and an internal frame, which is arranged in the box body and surrounds the periphery of the battery cell module, wherein the internal frame has an internal cavity, and the second explosion-proof valve, the internal cavity and the first explosion-proof valve can form a connected pressure relief channel.

2. The battery pack according to claim 1, characterized in that: The internal frame includes a pair of longitudinal beams and a plurality of cross beams arranged between the pair of longitudinal beams, the cross beams forming a first cavity therein, the longitudinal beams forming a second cavity therein connected to the first cavity, the cross beams can be connected to the second explosion-proof valve, and the longitudinal beams and / or the cross beams can be connected to the first explosion-proof valve.

3. The battery pack according to claim 2, characterized in that: The crossbeam is formed with a plurality of pressure relief inlets corresponding to the second explosion-proof valves along its length direction, and the crossbeam is provided with pressure relief outlets communicating with the second cavity at both ends thereof.

4. The battery pack according to claim 3, characterized in that: The cross beam includes an end beam and an intermediate beam, the end beam is connected to the end of the longitudinal beam, the intermediate beam is arranged between the end beams, and the end beam is provided with a pressure discharge port on the side away from the pressure relief inlet, and the pressure discharge port can be connected to the first explosion-proof valve.

5. The battery pack according to claim 2, characterized in that: The internal frame further comprises a spacing beam arranged parallel to the longitudinal beam.

6. The battery pack according to claim 1, characterized in that: The battery module comprises: A battery cell assembly, comprising a plurality of the battery cell units; and a cover plate structure, wherein the cover plate structure is arranged on at least one side of the battery core assembly, and the cover plate structure forms an isolation structure for separating each second explosion-proof valve.

7. The battery pack according to claim 6, characterized in that: The cover plate structure comprises: an integrated end plate connected to at least one side of the battery cell assembly, the integrated end plate being provided with an enclosing area corresponding to the second explosion-proof valve; and a covering structure, covering the enclosed area, for isolating each of the second explosion-proof valves.

8. The battery pack according to claim 7, characterized in that: The covering structure includes an explosion-proof valve side cover and a protective cover plate. The explosion-proof valve side cover includes a plurality of isolation structures. The plurality of isolation structures correspondingly cover a plurality of enclosed areas. The protective cover plate is connected to the outer side of the explosion-proof valve side cover.

9. The battery pack according to any one of claims 1 to 9, characterized in that: An electrical area for installing electrical components is formed in the box body, and the electrical area is located between the internal frame and the box body.

10. The battery pack according to any one of claims 1 to 9, characterized in that: The box body includes a tray and a box cover, wherein the box cover sealing cover is arranged on the tray, and the battery pack also includes a sealing structure, wherein the sealing structure is arranged between the tray and the box cover.

11. The battery pack according to claim 10, characterized in that: The sealing structure comprises a first sealing ring and a second sealing ring, wherein the first sealing ring is arranged between the tray and the box cover, and the second sealing ring is arranged between the internal frame and the box cover.

12. An electrical equipment, characterized in that: A battery pack comprising the battery pack according to any one of claims 1 to 11.

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