Battery pack and electric device

Abstract

A battery pack and an electric device. The battery pack comprises a case (100), battery modules (200), and a pressure relief system (400), wherein a plurality of battery modules (200) are stacked inside the case (100) in the direction of height of the case (100), each battery module (200) comprising a frame (2) and a battery cell group (1) accommodated inside the frame (2); each frame (2) is provided with a sub-channel (220), the sub-channels (220) of all the frames (2) are in communication with each other to form a module pressure relief channel (221), and ejecta generated when an explosion-proof valve of the battery cell group (1) bursts can flow into the module pressure relief channel (221); and the pressure relief system (400) can communicate the module pressure relief channel (221) with the exterior of the case (100).

Description

Battery pack and electric device

[0001] The present application claims priority to the Chinese patent application No. 202421302431.9 filed on June 7, 2024 to the Chinese patent application No. 202410738858.1 filed on June 7, 2024 and to the Chinese patent application No. 202421302440.8 filed on June 7, 2024, the contents of all of the above applications are hereby incorporated by reference in its entirety.

[0002] TECHNICAL FIELD

[0003] The present application relates to the technical field of battery, in particular to a battery pack and an electric device.

[0004] BACKGROUND

[0005] With the rise of new energy technology, electric vehicles have received widespread attention. The battery pack, as a very important component in electric vehicles, is set to provide sufficient electric energy for electric vehicles. The battery pack includes a box body and a battery module arranged in the box body. The box body is arranged to provide a containing space and impact protection for the battery module, thereby improving the safety of the battery pack.

[0006] TECHNICAL PROBLEM

[0007] In the related art, when the battery pack has a plurality of stacked battery modules, the pressure relief channels between the plurality of battery modules need to be connected through an exhaust pipe. The assembly of the exhaust pipe not only consumes time and effort, but also requires a fixing structure to fix the exhaust pipe. Therefore, the assembly of the exhaust pipe and the fixing structure not only reduces the assembly efficiency of the battery pack, but also increases the weight of the battery pack to some extent, thereby reducing the energy density of the battery pack.

[0008] TECHNICAL SOLUTION

[0009] In a first aspect, the embodiments of the present application provide a battery pack, comprising:

[0010] a box body;

[0011] a plurality of battery modules stacked in the box body along a height direction of the box body, each of the battery modules comprising a frame and a battery cell group accommodated in the frame; the frame has a sub-channel, and the sub-channels of the frames are connected to form a module pressure relief channel, and the explosion valve of the battery cell group can flow into the module pressure relief channel when the explosion valve is blown off;

[0012] a pressure relief system connecting the module pressure relief channel and the outside of the box body.

[0013] In a second aspect, the embodiments of the present application provide a power consuming device, comprising a device body and the battery pack according to any one of the above, the device body having a mounting space for accommodating the battery pack.

[0014] Advantages

[0015] The battery pack provided by the present application can improve the safety of the battery pack and realize lightweight design of the battery pack and improve the energy density of the battery pack by forming the module pressure relief channel through the sub-channels on the frames of the plurality of battery modules arranged in a stacked manner and discharging part of the eruption material in the module pressure relief channel outside the box through the pressure relief system when the air pressure in the module pressure relief channel is higher than the preset air pressure.

[0016] The power consuming device provided by the present application can improve the safety of the power consuming device by applying the above battery pack.

[0017] BRIEF DESCRIPTION OF DRAWINGS

[0018] FIG. 1 is a structural schematic diagram of a battery pack provided by an embodiment of the present application;

[0019] FIG. 2 is an exploded schematic diagram of the battery pack provided by an embodiment of the present application;

[0020] FIG. 3 is a sectional schematic diagram of the battery pack in FIG. 1;

[0021] FIG. 4 is an exploded schematic diagram of a battery module in FIG. 2;

[0022] FIG. 5 is a partial enlarged view of the battery module in FIG. 3;

[0023] FIG. 6 is a partial enlarged view of the battery pack in FIG. 3;

[0024] FIG. 7 is a structural schematic diagram of a frame of a battery module provided by an embodiment of the present application;

[0025] FIG. 8 is a structural schematic diagram of a pressure relief system provided by an embodiment of the present application;

[0026] FIG. 9 is a structural schematic diagram of two adjacent frames in a connected state provided by an embodiment of the present application;

[0027] FIG. 10 is a structural schematic diagram of two adjacent frames in a disassembled state provided by an embodiment of the present application;

[0028] FIG. 11 is a sectional view of the adapter part at one end of the first direction of two adjacent frames in FIG. 6;

[0029] FIG. 12 is a sectional view of the adapter part at the other end of the first direction of two adjacent frames in FIG. 6.

[0030] Reference Signs:

[0031] 100, box; 1000, first interval; 101, cover; 1011, top wall; 1012, first surrounding wall surface; 1013, second surrounding wall surface; 102, sealing plate; 200, battery module; 2000, second interval; 20, cell protection piece; 201, first battery module; 202, second battery module; 203, third battery module; 204, fourth battery module; 300, module protection piece; 400, pressure relief system; 401, mounting plate; 402, communication pipe; 4021, pipe part; 4022, sealing part; 40221, first sealing surface; 40222, second sealing surface; 403, pressure relief valve; 404, breather valve; 500, BMS;

[0032] 1, cell group;

[0033] 2, frame; 21, frame body; 22, passage piece; 220, sub-passage; 221, module pressure relief passage; 222, pressure relief port; 23, adapter; 231, upper inner adapter; 232, upper outer adapter; 233, lower inner adapter; 234, lower outer adapter; 211, first frame; 212, second frame; 213, third frame; 214, fourth frame;

[0034] 3, pressure relief support assembly; 30, cell pressure relief passage; 31, bottom plate; 311, opening; 32, support piece; 33, insulating support; 331, pressure relief inlet; 332, notch; 330, pressure relief outlet;

[0035] 4, cover plate;

[0036] 5, fireproof belt;

[0037] 6, liquid cooling system;

[0038] 7, integrated busbar;

[0039] 8, insulating cover plate;

[0040] 9, shell.

[0041] Embodiments of the application

[0042] FIG. 1 shows a structural schematic diagram of a battery pack provided by the present application. FIG. 2 shows an exploded schematic diagram of the battery pack provided by the present application. As shown in FIGS. 1-2, the battery pack includes a box 100 and a battery module 200 arranged in the box 100, the box 100 is arranged to provide the battery module 200 with protection against collision, water and dust, and the battery module 200 can be charged and discharged to meet the power demand of users.

[0043] The application provides a power consumption device, which comprises a device body and a battery pack, and the device body has a mounting space for accommodating the battery pack. The power consumption device can be a new energy vehicle, a power storage device, or other power consumption devices, which are not limited herein.

[0044] Figure 3 shows a cross-sectional view of the battery pack in Figure 1. As shown in Figure 3 in combination with Figure 2, the box body 100 comprises a cover 101 and a sealing plate 102 fixed to the opening end of the cover 101, and the cover 101 comprises a top wall 1011 and a surrounding wall surrounding the side of the top wall 1011, which comprises a first surrounding wall surface 1012 and a second surrounding wall surface 1013 arranged at intervals along a first direction. The first direction is the front-to-rear direction of the seat, and the height direction of the box body 100 is perpendicular to the first direction. The first surrounding wall surface 1012 is arranged opposite to the backrest of the vehicle seat, at least part of the second surrounding wall surface 1013 is parallel to the first surrounding wall surface 1012, and the first surrounding wall surface 1012 and the second surrounding wall surface 1013 are both arranged obliquely relative to the sealing plate 102. A plurality of battery modules 200 are stacked in the box body 100 along the height direction of the box body 100 and are arranged in a staggered manner from bottom to top along the oblique direction of the first surrounding wall surface 1012. By stacking the battery modules 200 along the height direction of the box body 100, the height dimension of the battery pack is increased, the energy of the battery pack is ensured, and the horizontal space dimension of the battery pack is reduced. The box body 100 has the obliquely arranged first surrounding wall surface 1012 and the second surrounding wall surface 1013 to adapt to the inclined space. For example, when the battery pack of the embodiment is installed in the space behind the seat, the plurality of battery modules 200 are arranged in a staggered manner from bottom to top along the oblique direction of the first surrounding wall surface 1012 to fully utilize the internal space of the box body 100 and improve the energy density of the battery pack.

[0045] The above-mentioned special-shaped battery pack can be installed behind the seat of the vehicle, fully utilize the height space of the vehicle, and prolong the cruising range of the vehicle. The special-shaped battery pack can be used behind the seat of a B-class vehicle, or behind the seat of a sports car or a vehicle with a small body, which are not limited herein.

[0046] In an embodiment, the sealing plate 102 is fixedly connected with the vehicle chassis, and the surrounding wall of the cover 101 has a connecting portion extending outward from one end away from the top wall 1011 of the cover 101, and the connecting portion is sealingly and fixedly connected with the sealing plate 102. The connecting portion surrounds the side of the surrounding wall, and a sealing gasket or sealant is arranged between the connecting portion and the sealing plate 102, and the connecting portion and the sealing plate 102 are fixedly connected by bolts.

[0047] In an embodiment, the included angle between the first surrounding wall surface 1012 and the sealing plate 102 ranges from 60° to 75°, and the included angle between the backrest of the seat and the seat cushion ranges from 105° to 120°, so as to ensure the comfort of the seat. The lower end of the second surrounding wall surface 1013 is arranged in parallel with the first surrounding wall surface 1012, and the upper end of the second surrounding wall surface 1013 is matched with the outer contour of the battery module 200. On the one hand, the interval between the second surrounding wall surface 1013 and the battery module 200 can be reduced, and the battery module 200 can be conveniently positioned and fixed. On the other hand, the appearance size of the box body 100 can be reduced, and the requirement of the battery pack on the installation space can be reduced.

[0048] In an embodiment, the shapes of all the battery modules 200 are the same. The battery modules 200 are sequentially arranged in the first direction with the same staggered distance. In another embodiment, the shapes of all the battery modules 200 of the battery pack can be different or not all the same, which can be designed according to the shape of the installation space, and is not limited herein.

[0049] FIG. 4 shows an exploded schematic view of the battery module 200 in FIG. 2. As shown in FIG. 4 in combination with FIG. 3, the battery pack provided by the application further includes a module protection member 300 and a cell protection member 20. The plurality of battery modules 200 are stacked in the height direction of the box body 100 in the box body 100. There is a first interval 1000 between the battery module 200 and the inner wall of the box body 100. At least part of the module protection member 300 is accommodated in the first interval 1000, and the battery module 200 and the box body 100 are relatively fixed by the module protection member 300. The battery module 200 includes a shell 9 and a cell group 1 accommodated in the shell 9. The cell group 1 includes a plurality of integrated cells. There is a second interval 2000 between the cell group 1 and the inner wall of the shell 9. At least part of the cell protection member 20 is accommodated in the second interval 2000, and the cell group 1 and the shell 9 are relatively fixed by the cell protection member 20. The cell group 1 is fixed in the shell 9 by the cell protection member 20. The plurality of battery modules 200 are fixed in the box body 100 by the module protection member 300. The cell protection member 20 and the module protection member 300 can realize double protection, which can not only improve the safety of the battery pack as a whole, but also fully utilize the height space and improve the energy of the battery pack.

[0050] In the example of FIG. 3, the number of battery modules 200 is four, and the four battery modules 200 are arranged in the height direction of the box body 100. In other embodiments, the number of battery modules 200 can also be two, three, five, six, seven, eight, nine, ten or any number, which can be designed according to the application scene of the battery pack, and is not limited herein.

[0051] In an embodiment, the module protection member 300 is formed by filling a flowable insulating material into the first space 1000 and then solidifying. For example, after the battery module 200 is installed in the box 100, foam glue or pouring glue is filled into the first space 1000 between the battery module 200 and the box 100, and the module protection member 300 is formed after the foam glue or pouring glue is solidified. In this way, the module protection member 300 not only fixes the battery module 200 in the box 100, but also stably supports the battery module 200, and the module protection member 300 formed by the insulating material can reduce the probability of battery pack leakage and improve the safety of the battery pack.

[0052] In an embodiment, the cell protection member 20 is formed by filling a flowable insulating material into the second space 2000 and then solidifying. For example, after the cell group 1 is installed in the shell 9, foam glue or pouring glue is filled into the second space 2000 between the cell group 1 and the shell 9, and the cell protection member 20 is formed after the foam glue or pouring glue is solidified. In this way, the cell protection member 20 not only fixes the cell group 1 in the shell 9, but also stably supports the cell group 1, and the cell protection member 20 formed by the insulating material can reduce the probability of cell group 1 leakage and improve the safety of the battery module 200.

[0053] Continuing as shown in FIG. 4 in combination with FIG. 3, the shell 9 includes a frame 2, a cover plate 4, and a bottom plate 31. The frame 2 is a surrounding structure that penetrates up and down along the height direction of the box 100. The cover plate 4 is fixed to the upper end of the frame 2, and the bottom plate 31 is fixed to the lower end of the frame 2. In the process of assembling the battery module 200, the bottom plate 31 is first fixed to the lower end of the frame 2, then the cell group 1 and other structures are loaded, then the insulating material is injected into the closed space formed by the frame 2, the bottom plate 31, and the cell group 1, and the cell protection member 20 is formed after the insulating material is solidified. Finally, the cover plate 4 is fixed to the upper end of the frame 2.

[0054] Among the two adjacent battery modules 200, the bottom plate 31 of the upper shell 9 and the cover plate 4 of the lower shell 9 are in an integrated structure, so as to simplify the connection structure between the plurality of battery modules 200 and improve the assembly efficiency between the plurality of battery modules 200.

[0055] For the convenience of description, the battery module 200 fixedly connected with the sealing plate 102 is defined as the first battery module 201, and the remaining battery modules 200 are sequentially marked from bottom to top. The bottom plate 31 of the shell 9 of the upper one of the two adjacent battery modules 200 is in an integrated structure with the cover plate 4 of the shell 9 of the lower one of the two adjacent battery modules 200, which means that the bottom plate 31 of the second battery module 202 can serve as the cover plate 4 of the first battery module 201, and the bottom plate 31 of the third battery module 203 can serve as the cover plate 4 of the second battery module 202, and the bottom plate 31 of the fourth battery module 204 can serve as the cover plate 4 of the third battery module 203. In this way, the plurality of battery modules 200 are assembled, which can not only improve the assembly efficiency but also reduce the overall weight of the battery pack. In other embodiments, the shell 9 of each battery module 200 can also have the frame 2, the cover plate 4 and the bottom plate 31. In this case, the assembly of the battery modules 200 can be performed after the assembly of the single battery module 200 is completed. The assembly of the single battery module 200 can be performed by multiple workers or automatic assembly equipment at the same time, which can also improve the assembly efficiency.

[0056] In an embodiment, a sealing gasket is arranged between the connecting portion of the cover 101 (see FIG. 2) and the sealing plate 102, which is configured to ensure the sealing connection between the cover 101 and the sealing plate 102 to avoid the leakage of the insulation material during the curing and molding of the insulation material into the module protection member 300.

[0057] In the process of assembling the battery pack, the first battery module 201 (without the cover plate 4) is first fixed to the sealing plate 102, then the second battery module 202 (without the cover plate 4) is fixed to the first battery module 201, then the third battery module 203 (without the cover plate 4) is fixed to the second battery module 202, and finally the fourth battery module 204 (with the cover plate 4) is fixed to the third battery module 203. The two adjacent battery modules 200 are fixedly connected by fasteners, which can improve the connection strength between the battery modules 200, avoid the misalignment between the battery modules 200, and thus improve the stability and safety of the overall battery pack. After all the battery modules 200 are assembled, the cover 101 is arranged outside all the battery modules 200, and the cover 101 is fixedly connected with the sealing plate 102.

[0058] In an embodiment, the cell group 1 includes a plurality of cylindrical cells arranged at intervals in the same plane. In order to facilitate the installation of the cylindrical cells, the battery module 200 further includes an insulating support 33 arranged above the bottom plate 31 and configured to support and install the cell group 1.

[0059] Since the shell 9 will increase in pressure due to the eruption of the battery cell group 1 in thermal runaway, in order to avoid the explosion of the battery cell group 1 under high pressure eruption, it is necessary to timely remove the excess eruption in the shell 9. Therefore, the battery module 200 further comprises a support 32 located between the bottom plate 31 and the insulating support 33 to form a cell pressure relief channel 30 between the bottom plate 31 and the insulating support 33, the insulating support 33 has a pressure relief inlet 331 corresponding to the position of the explosion-proof valve of the cylindrical battery cell, and the bottom plate 31 has an opening 311 which is in communication with the cell pressure relief channel 30. When the battery cell group 1 is in thermal runaway or the pressure in the shell 9 increases, the eruption can enter the cell pressure relief channel 30 from the pressure relief inlet 331 of the insulating support 33, and then be discharged from the opening 311 of the bottom plate 31. The insulating support 33 has a pressure relief inlet 331 corresponding to each cylindrical battery cell, and when the explosion-proof valve of each cylindrical battery cell escapes the eruption, the eruption can enter the cell pressure relief channel 30 from the pressure relief inlet 331. The diameter of the pressure relief inlet 331 is smaller than the diameter of the cylindrical battery cell, so as to avoid the cylindrical battery cell from falling into the cell pressure relief channel 30 from the pressure relief inlet 331.

[0060] In an embodiment, the number of supports 32 is multiple, and the multiple supports 32 are uniformly arranged between the bottom plate 31 and the insulating support 33 to provide uniform and stable support force for the insulating support 33, while ensuring that the cell pressure relief channel 30 has sufficient space for airflow to flow. Since the cell pressure relief channel 30 is formed by the interval between the bottom plate 31 and the insulating support 33 formed by the support 32, in order to ensure smooth airflow in the cell pressure relief channel 30, the projection area of the support 32 on the bottom plate 31 or the insulating support 33 is much smaller than the area of the bottom plate 31 or the area of the insulating support 33, so as to ensure that the cell pressure relief channel 30 has a large enough space for airflow to flow. In addition, the support 32 also serves as a support structure for supporting the insulating support 33 and the battery cell group 1 thereon, and the support 32 needs to be able to meet a certain support strength, while being able to provide uniform and constant support force for the insulating support 33, avoiding deformation of the insulating support 33 due to uneven stress under the action of the support 32 and the battery cell group 1. In the examples of FIGS. 3 and 4, the support 32 is cylindrical, the projection area of a single support 32 on the insulating support 33 is smaller than the diameter of the cylindrical battery cell, and slightly larger than the interval between two adjacent cylindrical battery cells, and the support 32 can completely avoid the pressure relief inlet 331 of the insulating support 33, or can partially block the pressure relief inlet 331, as long as it is not completely blocked, so as to ensure that the eruption generated by the explosion-proof valve of the cylindrical battery cell can smoothly enter the cell pressure relief channel 30 from the pressure relief inlet 331.

[0061] In an embodiment, the support 32 is made of foam, which can provide excellent heat insulation, cushioning, fire resistance, support, shock absorption, etc. In an embodiment, the support 32 can be fixedly connected to the bottom plate 31 and the insulating support 33 by double-sided adhesive.

[0062] Figure 5 shows a partial enlarged view of the battery module 200 in Figure 3. As shown in Figure 5 in combination with Figure 4, the battery module 200 further comprises a fireproof belt 5 disposed between the insulating support 33 and the cell group 1, the fireproof belt 5 being made of high-temperature-resistant material and having heat insulation and fire resistance.

[0063] In an embodiment, the battery module 200 further comprises a liquid cooling system 6, which comprises a plurality of liquid cooling plates and a pipeline connecting the plurality of liquid cooling plates, and a liquid cooling plate is disposed between every two adjacent rows of cylindrical cells to cool the cylindrical cells. The lengths of the plurality of liquid cooling plates can all be the same, all be different, or not all be the same, and the length of each liquid cooling plate is determined by the length of the two rows of cylindrical cells cooperating with it, which is not limited herein.

[0064] In an embodiment, the battery module 200 further comprises an integrated busbar 7 (Cells Contact System, CCS) and an insulating cover plate 8, the CCS 7 is welded on the pole of the cylindrical cell, and the cylindrical cell can be connected in series or parallel through the CCS 7, and the insulating cover plate 8 is bonded to the CCS 7 by glue and is provided as an insulating cover of the cell and the box cover of the box 100, and can also prevent the cell from opening the valve and jumping up when it is out of control. For example, the insulating cover plate 8 can be a glass fiber plate.

[0065] Figure 6 is a partial enlarged view of the battery pack in Figure 3. As shown in Figure 6 in combination with Figure 4, the battery pack further comprises a pressure relief system 400, and the frame 2 of all the battery modules 200 has a sub-channel 220, the sub-channels 220 of all the frames 2 are connected to form a module pressure relief channel 221, and the spewing material generated when the explosion-proof valve of the cell group 1 explodes can flow into the module pressure relief channel 221; the inlet of the pressure relief system 400 is connected to the module pressure relief channel 221, and part of the spewing material in the module pressure relief channel 221 can be discharged out of the box 100 through the pressure relief system 400. The pressure relief scheme of the battery pack can reduce or even eliminate the need to set an exhaust pipe and a fixing structure of the exhaust pipe between the battery modules 200, and only the sub-channels 220 on the frames 2 of the plurality of battery modules 200 arranged in a stacked manner form the module pressure relief channel 221, and when the air pressure in the module pressure relief channel 221 is higher than a preset air pressure, part of the spewing material in the module pressure relief channel 221 is discharged out of the box 100 through the pressure relief system 400, which not only can improve the safety of the battery pack, but also can realize the lightweight design of the battery pack and improve the energy density of the battery pack.

[0066] In an embodiment, the cell relief channel 30 has a relief outlet 330, all the cell relief channels 30 in the battery module 200 are in direct communication with the sub-channels 220 of the frame 2 through the relief outlet 330, so that the airflow in the cell relief channel 30 can flow into the sub-channels 220. The insulating support 33 has a gap 332, and the bottom plate 31 has an opening 311, the opening 311 and the gap 332 jointly form the relief outlet 330, so as to ensure that the sub-channels 220 between the plurality of battery modules 200 are in communication with each other.

[0067] In an embodiment, as shown in FIG. 6 in combination with FIG. 4, the insulating support 33 has a gap 332, and the bottom plate 31 has an opening 311, the gap 332 of the insulating support 33 is arranged around the periphery of the sub-channel 220, so that the opening 311 on the bottom plate 31 is in direct communication with the sub-channel 220. The bottom plate 31 of the first battery module 201 is fixed on the sealing plate 102, and the opening 311 thereon is closed by the sealing plate 102; the bottom plate 31 of the second battery module 202 is fixed on the frame 2 of the first battery module 201, and the opening 311 thereon is in direct communication with the sub-channel 220 of the first battery module 201; the bottom plate 31 of the third battery module 203 is fixed on the frame 2 of the second battery module 202, and the opening 311 thereon is in direct communication with the sub-channel 220 of the second battery module 202; the bottom plate 31 of the fourth battery module 204 is fixed on the frame 2 of the third battery module 203, and the opening 311 thereon is in direct communication with the sub-channel 220 of the third battery module 203, so as to realize the communication between the sub-channels 220 of the four battery modules 200.

[0068] In another embodiment, the insulating support 33 has a gap 332, and the bottom plate 31 has an opening 311, the gap 332 of the insulating support 33 is located below the sub-channel 220, so that the opening 311 on the bottom plate 31 is in communication with the sub-channel 220 through the gap 332, and the sub-channels 220 between the plurality of battery modules 200 can also be communicated through the relief outlet 330 formed by the opening 311 and the gap 332.

[0069] FIG. 7 shows a structural schematic diagram of a frame 2 of the battery module 200 provided by the present application. As shown in FIG. 7 in combination with FIG. 6, the frame 2 comprises a frame body 21 and a channel member 22, the frame body 21 is a surrounding structure penetrating up and down along the height direction of the box body 100, and the channel member 22 is fixed on the inner wall of the frame body 21, the channel member 22 cooperates with the inner wall of the frame body 21 to form the sub-channel 220 or the channel member 22 has the sub-channel 220 therein, and the sub-channel 220 penetrates the channel member 22 along the height direction of the box body 100. In an embodiment, the frame body 21 and the channel member 22 are integrally formed, which not only can improve the structural strength of the frame 2 as a whole, but also can save the assembly time of the frame 2 and improve the assembly efficiency of the battery module 200.

[0070] Since all the sub-channels 220 are communicated with each other, as long as one of the outer side walls of the frame 2 is provided with a pressure relief port 222 communicated with the sub-channels 220, and then the inlet of the pressure relief system 400 is communicated with the pressure relief port 222, the eruption material in the module pressure relief channel 221 can be discharged from the pressure relief system 400.

[0071] Figure 8 shows a structural schematic diagram of the pressure relief system 400 provided by the present application. As shown in Figure 8 in combination with Figure 6, the pressure relief system 400 comprises a mounting plate 401, a communication pipe 402 and a pressure relief valve 403. The mounting plate 401 is fixed on the box body 100, the pressure relief valve 403 is installed on the mounting plate 401 and located outside the box body 100, and the first end of the communication pipe 402 is installed on the mounting plate 401 and surrounds the inlet of the pressure relief valve 403, and the second end thereof surrounds the side of the pressure relief port 222. The box body 100 has a hole position for mounting the mounting plate 401, the second end of the communication pipe 402 passes through the hole position and is in sealing fit with the side wall of the frame 2, and the mounting plate 401 is located outside the hole position and is in sealing and fixed connection with the outer wall of the box body 100.

[0072] The pressure relief system 400 further comprises a breather valve 404, which is installed on the mounting plate 401 and located outside the box body 100, and is configured to balance the air pressure between the inside and outside of the box body 100. The pressure relief valve 403 is configured to relieve pressure when the air pressure in the box body 100 exceeds a preset value, so as to avoid excessive increase of the air pressure in the box body 100; and the breather valve 404 is configured to ventilate when the air pressure in the box body 100 is lower than a preset value, so as to ensure the balance of the air pressure between the inside and outside of the box body 100.

[0073] In an embodiment, the frame 2 of the second battery module 202 and the frame 2 of the third battery module 203 are both provided with the pressure relief port 222, the pressure relief system 400 is communicated with the two pressure relief ports 222, and the pressure relief valve 403 and the breather valve 404 of the pressure relief system 400 are arranged in a spaced manner along the stacking direction of the second battery module 202 and the third battery module 203.

[0074] In an embodiment, the communication pipe 402 comprises a pipe portion 4021 and a sealing portion 4022. One end of the pipe portion 4021 is fixed on the mounting plate 401 and surrounds the side of the pressure relief valve 403, and the other end thereof is connected with the sealing portion 4022. The sealing portion 4022 is configured to be in sealing fit with the outer side wall of the frame 2, and the pressure relief port 222 on the frame 2 is located in the pipe portion 4021, so that the eruption material in the module pressure relief channel 221 can enter the pipe portion 4021 from the pressure relief port 222, and the eruption material can be discharged from the pressure relief valve 403 when the pressure of the eruption material is greater than a preset pressure.

[0075] When the second battery module 202 and the third battery module 203 are misalignedly stacked, the end face of the sealing part 4022 sealingly fitted with the frame 2 of the battery module 200 has a first sealing face 40221 and a second sealing face 40222 arranged in a stepped manner, the first sealing face 40221 is sealingly fitted with the frame 2 of the second battery module 202, and the second sealing face 40222 is sealingly fitted with the frame 2 of the third battery module 203.

[0076] The battery module 200 provided in the present application improves the frame 2 of the shell 9 to facilitate the fixed connection between the misalignedly stacked shells 9, and improves the stability of the shell 9.

[0077] FIG. 9 shows a structural schematic diagram of two adjacent frames 2 in a connected state, and FIG. 10 shows a structural schematic diagram of two adjacent frames 2 in a disassembled state. As shown in FIGS. 9-10 and in combination with FIG. 6, the end of any frame 2 close to the other frame 2 has an adapter part 23 at both ends in the first direction, one of the two adapter parts 23 is located inside the frame 2, and the other is located outside the frame 2, and the adapter part 23 located inside the frame 2 of one frame 2 is fixedly connected with the adapter part 23 located outside the frame 2 of the adjacent other frame 2, and the adapter part 23 located outside the frame 2 is fixedly connected with the adapter part 23 located inside the frame 2 of the adjacent other frame 2. In this way, the fixed connection between the frames 2 is facilitated.

[0078] The frame 2 adjacent to the sealing plate 102 has an adapter part 23 at both ends in the first direction close to the sealing plate 102, and the two adapter parts 23 are fixedly connected with the sealing plate 102. In this way, the fixed connection between the frame 2 adjacent to the sealing plate 102 and the sealing plate 102 is facilitated. In an embodiment, one of the two adapter parts 23 is located inside the frame 2, and the other is located outside the frame 2; or both of the two adapter parts 23 are located inside the frame 2; or both of the two adapter parts 23 are located outside the frame 2, and the three setting modes can realize the connection between the frame 2 and the sealing plate 102.

[0079] The frame 2 farthest from the sealing plate 102 has an adapter part 23 at both ends in the first direction away from the sealing plate 102, and the two adapter parts 23 are arranged to be fixedly connected with the cover plate 4. In an embodiment, one of the two adapter parts 23 is located inside the frame 2, and the other is located outside the frame 2; or both of the two adapter parts 23 are located inside the frame 2; or both of the two adapter parts 23 are located outside the frame 2, and the three setting modes can realize the connection between the frame 2 and the cover plate 4.

[0080] Fig. 11 shows a cross-sectional view of the adapter 23 at one end of the first direction of two adjacent frames 2 in Fig. 6. Fig. 12 shows a cross-sectional view of the adapter 23 at the other end of the first direction of two adjacent frames 2 in Fig. 6. As shown in Figs. 11-12 and in combination with Figs. 6, 3, for the convenience of description, the frame 2 of the first battery module 201 is denoted as the first frame 211, the frame 2 of the second battery module 202 is denoted as the second frame 212, the frame 2 of the third battery module 203 is denoted as the third frame 213, and the frame 2 of the fourth battery module 204 is denoted as the fourth frame 214, wherein the first frame 211 is the frame 2 adjacent to the sealing plate 102, and the fourth frame 214 is the frame 2 farthest from the sealing plate 102. The upper and lower adapters 23 located inside the frame 2 are denoted as the upper inner adapter 231 and the lower inner adapter 233, and the upper and lower adapters 23 located outside the frame 2 are denoted as the upper outer adapter 232 and the lower outer adapter 234.

[0081] The lower end of the first frame 211, the second frame 212, the third frame 213, and the fourth frame 214 has the lower inner adapter 233 and the lower outer adapter 234 at both ends of the first direction, respectively, the upper end of the first frame 211, the second frame 212, and the third frame 213 has the upper outer adapter 232 and the upper inner adapter 231 at both ends of the first direction, respectively, and the upper end of the fourth frame 214 has the upper inner adapter 231 at both ends of the first direction.

[0082] The connection relationship between the frames 2 is that the lower inner adapter 233 and the lower outer adapter 234 of the lower end of the first frame 211 are fixedly connected with the corresponding bottom plate 31 and the sealing plate 102; the lower inner adapter 233 of the lower end of the second frame 212 is fixedly connected with the upper outer adapter 232 of the upper end of the first frame 211, and the lower outer adapter 234 is fixedly connected with the upper inner adapter 231 of the upper end of the first frame 211; the lower inner adapter 233 of the lower end of the third frame 213 is fixedly connected with the upper outer adapter 232 of the upper end of the second frame 212, and the lower inner adapter 233 is fixedly connected with the upper outer adapter 232 of the upper end of the second frame 212; the lower inner adapter 233 of the lower end of the fourth frame 214 is fixedly connected with the upper outer adapter 232 of the upper end of the third frame 213, and the lower inner adapter 233 is fixedly connected with the upper outer adapter 232 of the upper end of the third frame 213; and the two upper inner adapters 231 of the upper end of the fourth frame 214 are used for fixedly connecting with the cover plate 4.

[0083] The upper inner adapter 231 of the upper end of the first frame 211, the second frame 212, the third frame 213 and the fourth frame 214 is detachably fixedly connected with the corresponding frame 2; the lower outer adapter 234 and the lower inner adapter 233 of the lower end of the first frame 211, the second frame 212, the third frame 213 and the fourth frame 214 are integral structures with the corresponding frame 2; the upper outer adapter 232 of the upper end of the first frame 211, the second frame 212 and the third frame 213 is an integral structure with the corresponding frame 2. Of course, in other embodiments, the adapter 23 is an integral structure or detachably fixedly connected with the frame 2, which can be designed as needed. All adapters 23 of one frame 2 are integrally formed with the frame 2; or all adapters 23 of one frame 2 are detachably fixedly connected with the frame 2; or part of the adapters 23 of one frame 2 are integrally formed with the frame 2, and the other part of the adapters 23 are detachably fixedly connected with the frame 2, which is not limited here.

[0084] When the adapter 23 is detachably fixedly connected with the frame 2, the side wall of the frame 2 has a through hole, the side surface of the adapter 23 has a first threaded hole, and the bolt is threadedly connected with the first threaded hole of the adapter 23 through the through hole of the side wall of the frame 2, so as to realize the fixed connection of the adapter 23 with the frame 2. The top surface of the adapter 23 has a second threaded hole, and the adapter 23 of the bottom plate 31 or the cover plate 4 or other frame 2 is threadedly connected with the second threaded hole by the bolt. The first threaded hole and the second threaded hole are arranged staggered in the horizontal plane.

[0085] The upper inner adapter 231 of the upper end of the first frame 211, the second frame 212, the third frame 213 and the fourth frame 214 is detachably fixedly connected with the corresponding frame 2; the lower outer adapter 234 and the lower inner adapter 233 of the lower end of the first frame 211, the second frame 212, the third frame 213 and the fourth frame 214 are integral structures with the corresponding frame 2; the upper outer adapter 232 of the upper end of the first frame 211, the second frame 212 and the third frame 213 is an integral structure with the corresponding frame 2. Of course, in other embodiments, the adapter 23 is an integral structure or detachably fixedly connected with the frame 2, which can be designed as needed. All adapters 23 of one frame 2 are integrally formed with the frame 2; or all adapters 23 of one frame 2 are detachably fixedly connected with the frame 2; or part of the adapters 23 of one frame 2 are integrally formed with the frame 2, and the other part of the adapters 23 are detachably fixedly connected with the frame 2, which is not limited here.

[0084] When the adapter 23 is detachably fixedly connected with the frame 2, the side wall of the frame 2 has a through hole, the side surface of the adapter 23 has a first threaded hole, and the bolt is threadedly connected with the first threaded hole of the adapter 23 through the through hole of the side wall of the frame 2, so as to realize the fixed connection of the adapter 23 with the frame 2. The top surface of the adapter 23 has a second threaded hole, and the adapter 23 of the bottom plate 31 or the cover plate 4 or other frame 2 is threadedly connected with the second threaded hole by the bolt. The first threaded hole and the second threaded hole are arranged staggered in the horizontal plane.

[0085] The upper inner adapter 231 of the upper end of the first frame 211, the second frame 212, the third frame 213 and the fourth frame 214 is detachably fixedly connected with the corresponding frame 2; the lower outer adapter 234 and the lower inner adapter 233 of the lower end of the first frame 211, the second frame 212, the third frame 213 and the fourth frame 214 are integral structures with the corresponding frame 2; the upper outer adapter 232 of the upper end of the first frame 211, the second frame 212 and the third frame 213 is an integral structure with the corresponding frame 2. Of course, in other embodiments, the adapter 23 is an integral structure or detachably fixedly connected with the frame 2, which can be designed as needed. All adapters 23 of one frame 2 are integrally formed with the frame 2; or all adapters 23 of one frame 2 are detachably fixedly connected with the frame 2; or part of the adapters 23 of one frame 2 are integrally formed with the frame 2, and the other part of the adapters 23 are detachably fixedly connected with the frame 2, which is not limited here.

Claims

1. A battery pack, comprising: a box (100) ; a plurality of battery modules (200) stacked in the box (100) along the height direction of the box (100), each of the battery modules (200) comprising a frame (2) and a cell group (1) accommodated in the frame (2), the frame (2) having a sub-channel (220), the sub-channels (220) of the frames (2) being connected to form a module pressure relief channel (221), and the explosion vent of the cell group (1) being capable of flowing into the module pressure relief channel (221) when the explosion vent is blasted; a pressure relief system (400) connecting the module pressure relief channel (221) and the outside of the box (100).

2. The battery pack of claim 1, wherein, The frame (2) comprises a frame body (21) and a channel piece (22), the channel piece (22) being fixed to the inner wall of the frame body (21), the channel piece (22) and the inner wall of the frame body (21) cooperating to form the sub-channel (220), or the channel piece (22) having the sub-channel (220), and the sub-channel (220) extending along the height direction of the box (100).

3. The battery pack of claim 2, wherein, The frame body (21) and the channel piece (22) are in an integrated structure.

4. The battery pack of claim 1, wherein, The battery module (200) further comprises a pressure relief support assembly (3), the pressure relief support assembly (3) being installed at the end of the frame (2) and arranged to support the cell group (1), the pressure relief support assembly (3) having a cell pressure relief channel (30), the cell pressure relief channel (30) having a pressure relief inlet (331) corresponding to the explosion vent of the cell group (1) and a pressure relief outlet (330) connected to the module pressure relief channel (221).

5. The battery pack of claim 4, wherein, The pressure relief support assembly (3) further comprises a bottom plate (31) and an insulating support (33) arranged in sequence, the cell pressure relief channel (30) being formed between the bottom plate (31) and the insulating support (33), the bottom plate (31) being fixed to the end of the frame (2), the bottom plate (31) having an opening (311), the insulating support (33) having a notch (332) corresponding to the opening (311), the opening (311) and the notch (332) together forming the pressure relief outlet (330), and the insulating support (33) being arranged to support the cell group (1) and having the pressure relief inlet (331).

6. The battery pack of claim 5, wherein, The battery module (200) further comprises a support piece (32), the support piece (32) being located between the bottom plate (31) and the insulating support (33), one end of the support piece (32) being connected to the bottom plate (31) and the other end of the support piece (32) being connected to the insulating support (33), so that the cell pressure relief channel (30) is formed between the bottom plate (31) and the insulating support (33).

7. The battery pack of claim 5, wherein, The battery cell group (1) comprises a plurality of cylindrical battery cells arranged in the same plane, and the insulating support (33) has a plurality of pressure relief inlets (331) arranged one by one with the explosion-proof valves of the plurality of cylindrical battery cells.

8. The battery pack of claim 5, wherein, In the two adjacent battery modules (200), the sub-channels (220) of the upper battery module (200) are communicated with the sub-channels (220) of the lower battery module (200) through the corresponding pressure relief outlets (330).

9. The battery pack of claim 8, wherein, The battery module (200) comprises a shell (9) composed of the frame (2), a bottom plate (31) and a cover plate (4) connected to opposite ends of the frame (2), and in the two adjacent battery modules (200), the bottom plate (31) on one side of the upper battery module (200) and the cover plate (4) on the other side of the lower battery module (200) are integrated.

10. The battery pack of claim 9, further comprising at least one of: a module protection member (300), a first gap (1000) is formed between the battery module (200) and the inner wall of the box (100), the module protection member (300) is at least partially accommodated in the first gap (1000), and the shell (9) and the box (100) are bonded by the module protection member (300); a battery cell protection member (20), a second gap (2000) is formed between the battery cell group (1) and the inner wall of the shell (9), the battery cell protection member (20) is at least partially accommodated in the second gap (2000), and the battery cell group (1) and the shell (9) are bonded by the battery cell protection member (20).

11. The battery pack of claim 10, wherein, In the case that the battery pack at least comprises the module protection member (300), the module protection member (300) is filled in the first gap (1000) and solidified after the flowable insulating material is filled in the first gap (1000); In the case that the battery pack at least comprises the battery cell protection member (20), the battery cell protection member (20) is filled in the second gap (2000) and solidified after the flowable insulating material is filled in the second gap (2000).

12. The battery pack of claim 11, wherein, The insulating material filled in the first gap (1000) is foaming glue or pouring glue; The insulating material filled in the second gap (2000) is foaming glue or pouring glue.

13. The battery pack of any one of claims 1-12, wherein, At least one of the outer side walls of the frame (2) is provided with a pressure relief port (222) communicated with the sub-channel (220), and the inlet of the pressure relief system (400) is communicated with the pressure relief port (222).

14. The battery pack of claim 13, wherein, The pressure relief system (400) comprises a mounting plate (401), a communication pipe (402) and a pressure relief valve (403), the mounting plate (401) is fixed on the box (100), the pressure relief valve (403) is installed on the mounting plate (401) and located outside the box (100), one end of the communication pipe (402) is installed on the mounting plate (401) and surrounds the inlet of the pressure relief valve (403), and the other end surrounds the periphery of the pressure relief port (222).

15. The battery pack of claim 14, wherein, The pressure relief system (400) further comprises a breather valve (404), which is installed on the mounting plate (401) and located outside the box (100).

16. The battery pack of claim 14, wherein, The communication pipe (402) comprises a pipe part (4021) and a sealing part (4022), one end of the pipe part (4021) is fixed on the mounting plate (401) and surrounds the periphery of the pressure relief valve (403), the other end of the pipe part (4021) is connected with the sealing part (4022), the sealing part (4022) is sealingly matched with the outer side wall of the frame (2), and the pressure relief port (222) is located in the pipe part (4021).

17. The battery pack of any one of claims 1-12, wherein, The box (100) comprises a cover shell (101) and a sealing plate (102), the sealing plate (102) is fixed on the opening end of the cover shell (101) and cooperates with the cover shell (101) to form a containing space for containing the battery module (200), the battery module (200) close to the sealing plate (102) is fixedly connected with the sealing plate (102), and the sealing plate (102) supports a plurality of battery modules (200).

18. The battery pack of any one of claims 1-12, wherein, A plurality of battery modules (200) are stacked along the height direction of the box (100), and in two adjacent battery modules (200), the bottom plate (31) of the shell (9) on one side of the upper battery module (200) and the cover plate (4) of the shell (9) on the other side of the lower battery module (200) are integrated.

19. The battery pack of any one of claims 1-12, wherein, The box (100) comprises a cover shell (101) and a sealing plate (102) fixed on the opening end of the cover shell (101), the cover shell (101) comprises a first surrounding wall surface (1012) inclined relative to the sealing plate (102); a plurality of battery modules (200) are stacked in the box (100) along the height direction of the box (100) and are arranged in a staggered manner, and the plurality of battery modules (200) are installed in sequence along the inclination direction of the first surrounding wall surface (1012).

20. The battery pack of claim 19, wherein, The included angle between the first surrounding wall surface (1012) and the sealing plate (102) ranges from 60° to 75°.

21. The battery pack of claim 19, wherein, The cover shell (101) further comprises a second surrounding wall surface (1013), the second surrounding wall surface (1013) is oppositely arranged with the first surrounding wall surface (1012) and at least partially parallel to the first surrounding wall surface (1012).

22. The battery pack of claim 19, wherein, Each of the frames (2) has two adapter portions (23) at the ends of the end portion close to the other frame (2), one of the two adapter portions (23) is located inside the frame (2), the other is located outside the frame (2), and the adapter portion (23) located inside the frame (2) is fixedly connected with the adapter portion (23) located outside the other frame (2) of the adjacent frame (2), and the adapter portion (23) located outside the frame (2) is fixedly connected with the adapter portion (23) located inside the other frame (2) of the adjacent frame (2).

23. The battery pack of claim 22, wherein, The frame (2) adjacent to the sealing plate (102) has the adapter portion (23) at the end close to the sealing plate (102), and the adapter portion (23) is fixedly connected with the sealing plate (102).

24. The battery pack of claim 23, wherein, All the adapter portions (23) of one frame (2) are integrally formed with the frame (2); or All the adapter portions (23) of one frame (2) are detachably fixedly connected with the frame (2); or Part of the adapter portions (23) of one frame (2) are integrally formed with the frame (2), and the other part of the adapter portions (23) are detachably fixedly connected with the frame (2).

25. An electric device comprising a device body and the battery pack according to any one of claims 1-24, the device body having a mounting space inside for accommodating the battery pack.

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