Battery pack and vehicle

Abstract

The utility model discloses a battery pack and a vehicle, and relates to the technical field of batteries. The battery pack comprises a box body and a battery module, the box body comprises a housing and a sealing plate fixed at the opening end of the housing, and the housing comprises a first enclosure wall surface inclined relative to the sealing plate; the plurality of battery modules are stacked in the box body in the height direction of the box body and are arranged in a staggered manner, and the plurality of battery modules are sequentially mounted in the inclination direction of the first enclosure wall surface so as to adapt to the inclined mounting space. By applying the battery pack to the vehicle, the space behind the backrest of the vehicle seat can be fully utilized, and the endurance mileage of the vehicle is increased.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery pack and a vehicle. Background Art

[0002] With the rise of new energy technologies, electric vehicles have received widespread attention. As a very important component in electric vehicles, it is used to provide sufficient power for electric vehicles. The battery pack includes a box body and a battery module arranged in the box body. The box body provides a storage space and anti-collision protection for the battery module, which can improve the safety of the battery pack.

[0003] In the related art, when the installation space of the battery pack is an inclined irregular space, such as behind the vehicle seat, the ordinary flat battery pack cannot fully utilize the irregular space, resulting in a low energy density of the battery pack, which cannot meet the long-range requirements of the vehicle.

[0004] This section provides background information related to the present application which is not necessarily prior art. Utility Model Content

[0005] One purpose of the present application is to provide a battery pack and a vehicle that can fully utilize irregular spaces, increase the energy density of the battery pack, and meet the long-range requirements of the vehicle.

[0006] In order to achieve the above objectives, this application adopts the following technical solutions:

[0007] In a first aspect, the present application provides a battery pack, comprising:

[0008] The box body comprises a cover shell and a sealing plate fixed to an open end of the cover shell, wherein the cover shell comprises a first surrounding wall surface inclined relative to the sealing plate;

[0009] A plurality of battery modules are stacked in the box body along the height direction of the box body and arranged in a staggered manner. The plurality of battery modules are installed in sequence along the inclined direction of the first surrounding wall surface.

[0010] As an optional solution for the battery pack, the angle between the first surrounding wall surface and the sealing plate ranges from 60° to 75°.

[0011] As an optional solution of the battery pack, the cover shell further includes a second surrounding wall surface, which is arranged opposite to the first surrounding wall surface and is at least partially parallel to the first surrounding wall surface.

[0012] As an optional solution for the battery pack, the battery modules include a frame and a cell group, the frame includes a shell structure that penetrates up and down along the height direction of the box body, the cell group is accommodated in the frame, and the frames of two adjacent battery modules are fixedly connected.

[0013] As an optional solution for the battery pack, the end of any frame close to the other frame has a connecting portion at both ends in the front-rear direction of the seat, one of the two connecting portions is located inside the frame, and the other is located outside the frame, and the connecting portion of one frame located inside the frame is fixedly connected to the connecting portion of another adjacent frame located outside the frame, and the connecting portion located outside the frame is fixedly connected to the connecting portion of another adjacent frame located inside the frame.

[0014] As an optional solution for the battery pack, the frame adjacent to the sealing plate has a transition portion at its end close to the sealing plate, and the transition portion is fixedly connected to the sealing plate.

[0015] As an optional solution for the battery pack, one of the two adapters is located inside the frame, and the other is located outside the frame.

[0016] As an optional solution for the battery pack, the battery module further includes a cover plate, and the frame farthest from the sealing plate has a transition portion at its end away from the sealing plate, and the transition portion is fixedly connected to the cover plate.

[0017] As an optional solution for the battery pack, the two adapters are both located inside the frame.

[0018] As an optional solution of the battery pack, all the adapters of a frame are integrally formed with the frame.

[0019] As an optional solution of the battery pack, all the adapters of a frame are detachably fixedly connected to the frame.

[0020] As an optional solution for the battery pack, a partial adapter portion of a frame is integrally formed with the frame, and the partial adapter portion is detachably fixedly connected to the frame.

[0021] In a second aspect, the present application provides a vehicle comprising a chassis, a seat and a battery pack as described in any one of the above items, wherein the seat and the battery pack are both mounted on the chassis, and the battery pack is located behind the backrest of the seat, and the first surrounding wall surface is arranged opposite to the backrest.

[0022] The beneficial effects of this application are:

[0023] The battery pack provided in the present application ensures that the energy of the battery pack remains unchanged by stacking several battery modules along the height direction of the box and increasing the height dimension of the battery pack; the box has a first inclined surrounding wall surface to adapt to inclined spaces such as behind seats, and the stacked battery modules are staggered in sequence from bottom to top along the inclined direction of the first surrounding wall surface to fully utilize the internal space of the box and improve the energy density of the battery pack.

[0024] The vehicle provided in the present application, by applying the above-mentioned battery pack, can fully utilize the space behind the vehicle seat backrest and improve the vehicle's cruising range. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present application and these drawings without paying any creative work.

[0026] Figure 1 is a schematic diagram of the structure of a battery pack provided in an embodiment of the present application;

[0027] Figure 2 is an exploded schematic diagram of a battery pack provided in an embodiment of the present application;

[0028] Figure 3 yes Figure 1 A schematic cross-sectional view of a battery pack;

[0029] Figure 4 yes Figure 2 Schematic diagram of the battery module;

[0030] Figure 5 yes Figure 3 A partial enlarged view of the battery module;

[0031] Figure 6 yes Figure 3 A partial enlarged view of the battery pack;

[0032] Figure 7 It is a structural schematic diagram of a frame of a battery module provided in an embodiment of the present application;

[0033] Figure 8 is a schematic structural diagram of a pressure relief system provided in an embodiment of the present application;

[0034] Fig. 9 It is a structural schematic diagram of two adjacent frames in a connected state provided by an embodiment of the present application;

[0035] Fig.10 It is a schematic diagram of the structure of two adjacent frames in a disassembled state provided by an embodiment of the present application;

[0036] Fig.11 yes Figure 6 A cross-sectional view of two adjacent frames at a transition portion at one end in the first direction;

[0037] Fig.12 yes Figure 6A cross-sectional view of two adjacent frames at the transition portion at the other end in the first direction.

[0038] Reference numerals:

[0039] 100, box body; 1000, first compartment; 101, cover; 1011, top wall; 1012, first surrounding wall surface; 1013, second surrounding wall surface; 102, sealing plate; 200, battery module; 2000, second compartment; 20, battery cell protection member; 201, first battery module; 202, second battery module; 203, third battery module; 204, fourth battery module; 300, module protection member; 400, pressure relief system; 401, mounting plate; 402, connecting pipe; 4021, pipe part; 4022, sealing part; 40221, first sealing surface; 40222, second sealing surface; 403, pressure relief valve; 404, air valve; 500, BMS;

[0040] 1. Battery cell group;

[0041] 2. Frame; 21. Frame body; 22. Channel member; 220. Sub-channel; 221. Module pressure relief channel; 222. Pressure relief port; 23. Adapter; 231. Upper inner adapter; 232. Upper outer adapter; 233. Lower inner adapter; 234. Lower outer adapter; 11. First frame; 212. Second frame; 213. Third frame; 214. Fourth frame;

[0042] 3. Pressure relief support assembly; 30. Cell pressure relief channel; 31. Bottom plate; 311. Pressure relief outlet; 32. Support member; 33. Insulating bracket; 331. Pressure relief inlet;

[0043] 4. Cover plate;

[0044] 5. Firebreak;

[0045] 6. Liquid cooling system;

[0046] 7. Integrated busbar;

[0047] 8. Insulation cover;

[0048] 9. Shell. DETAILED DESCRIPTION

[0049] Before any embodiments of the application are explained in detail, it is to be understood that the application is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the above drawings.

[0050] In this application, the terms "comprises", "includes", "has" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device that includes the element.

[0051] In this application, the term "and / or" is a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects before and after are in an "and / or" relationship.

[0052] In the present application, the terms "connect", "combine", "couple", and "install" may refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, direct connection refers to two parts or components being connected together without the need for an intermediate piece, and indirect connection refers to two parts or components being connected to at least one intermediate piece respectively, and the two parts or components being connected via the intermediate piece. In addition, "connect" and "couple" are not limited to physical or mechanical connections or couplings, and may include electrical connections or couplings.

[0053] In the present application, it will be understood by those of ordinary skill in the art that relative terms (e.g., "about," "approximately," "substantially," etc.) used in conjunction with quantities or conditions include the values ​​and have the meaning indicated by the context. For example, the relative terms include at least the degree of error associated with the measurement of a specific value, the tolerances caused by manufacturing, assembly, and use associated with a specific value, and the like. Such terms should also be considered to disclose a range defined by the absolute values ​​of the two endpoints. Relative terms may refer to plus or minus a certain percentage (e.g., 1%, 5%, 10% or more) of the indicated value. Numerical values ​​that do not use relative terms should also be disclosed as specific values ​​with tolerances. In addition, "substantially" may refer to plus or minus a certain degree (e.g., 1 degree, 5 degrees, 10 degrees or more) on the basis of the indicated angle when expressing a relative angular position relationship (e.g., substantially parallel, substantially perpendicular).

[0054] In the present application, the terms "upper", "lower", "left", "right", "front", "back" and other directional words are described based on the orientation and positional relationship shown in the accompanying drawings, and should not be understood as limiting the embodiments of the present application. In addition, in the context, it is also necessary to understand that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to another element "upper" or "lower", but also indirectly connected to another element "upper" or "lower" through an intermediate element. It should also be understood that directional words such as upper side, lower side, left side, right side, front side, back side, etc. not only represent the positive orientation, but can also be understood as the lateral orientation. For example, the bottom can include directly below, lower left, lower right, lower front, and lower back, etc.

[0055] Figure 1 A schematic structural diagram of the battery pack provided in this application is shown. Figure 2 Schematic diagram of the battery pack provided by the present application is shown. Figure 1 to Figure 2 As shown, the battery pack includes a box body 100 and a battery module 200 arranged in the box body 100. The box body 100 is used to provide anti-collision, waterproof and dustproof protection for the battery module 200. The battery module 200 can be charged and discharged to meet the user's power demand.

[0056] The present application provides an electric device, including a device body and the battery pack, wherein the device body has an installation space for accommodating the battery pack. It is understandable that the electric device can be a new energy vehicle, an energy storage device, or other electric devices, which are not limited here.

[0057] Figure 3 Shows Figure 1 A cross-sectional view of the battery pack. Figure 3 Combination Figure 2As shown, the box 100 includes a housing 101 and a sealing plate 102 fixed to the open end of the housing 101, the housing 101 includes a top wall 1011 and a surrounding wall arranged around the top wall 1011, the surrounding wall includes a first surrounding wall surface 1012 and a second surrounding wall surface 1013 arranged at intervals along a first direction, wherein the first direction is the front-to-back direction of the seat, and the height direction of the box 100 is perpendicular to the first direction. The first surrounding wall surface 1012 is used to be 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 100 along the height direction of the box 100 and are sequentially staggered and arranged from bottom to top along the oblique direction of the first surrounding wall surface 1012. The battery pack is stacked and arranged along the height direction of the box 100 by stacking the battery modules 200, and the height dimension of the battery pack is increased to ensure that the energy of the battery pack remains unchanged, thereby reducing the size of the horizontal space of the battery pack; the box 100 has a first surrounding wall surface 1012 and a second surrounding wall surface 1013 that are arranged obliquely to adapt to the inclined space. For example, when the battery pack of this embodiment is installed in the space behind the seat, a 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, so as to make full use of the internal space of the box 100 and improve the energy density of the battery pack.

[0058] It is understandable that the above-mentioned special-shaped battery pack can be installed behind the seats of the vehicle, making full use of the height space of the vehicle and extending the vehicle's cruising range. The special-shaped battery pack can be used behind the seats of a Class B car, or behind the seats of a sports car or a vehicle with a smaller body, without limitation.

[0059] In one embodiment, the sealing plate 102 is used to be fixedly connected to the chassis of the vehicle, and the end of the surrounding wall of the cover 101 away from the top wall 1011 thereof has a connecting portion extending outside the box body 100, and the connecting portion is sealed and fixedly connected to the sealing plate 102. Further, the connecting portion is arranged around the surrounding wall, 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.

[0060] In one embodiment, the angle between the first wall surface 1012 and the cover plate 102 is 60° to 75°, and the corresponding angle between the backrest and the seat cushion of the seat is 105° to 120°, so as to ensure the comfort of the seat. The lower end of the second wall surface 1013 is arranged parallel to the first wall surface 1012, and the upper end of the second wall surface 1013 is adapted to the outer contour of the battery module 200. On the one hand, the interval between the second wall surface 1013 and the battery module 200 can be reduced, which is convenient for positioning and fixing the battery module 200; on the other hand, the appearance size of the box 100 can be reduced, and the requirements of the battery pack for the installation space can be reduced.

[0061] In one embodiment, all battery modules 200 have the same shape. All battery modules 200 are sequentially staggered in the first direction, and the staggered distances are the same. In another embodiment, the shapes of all battery modules 200 of the battery pack may be different or different, and may be specifically designed according to the shape of the installation space, which is not limited here.

[0062] Figure 4 Shows Figure 2 FIG. 2 is a schematic diagram of an exploded view of a battery module 200. Figure 4 Combination Figure 3 As shown, the battery pack provided in the present application also includes a module protection member 300 and a cell protection member 20, a plurality of battery modules 200 are stacked in the box body 100 along the height direction of the box body 100, a first gap 1000 exists between the battery module 200 and the inner wall of the box body 100, at least a portion of the module protection member 300 is accommodated in the first gap 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, a second gap 2000 exists between the cell group 1 and the inner wall of the shell 9, at least a portion of the cell protection member 20 is accommodated in the second gap 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 part 20; and the module protection part 300 fixes several battery modules 200 in the box 100. The cell protection part 20 and the module protection part 300 can achieve double protection, which can not only improve the overall safety of the battery pack, but also make full use of the height space to improve the energy of the battery pack.

[0063] Figure 3 In the example, the number of battery modules 200 is four, and the four battery modules 200 are stacked along 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, etc., which can be designed according to the application scenario of the battery pack and is not limited here.

[0064] In one embodiment, the module protection member 300 is formed by filling the first space 1000 with a fluid insulating material and then solidifying it. For example, after the battery module 200 is installed in the box 100, the foam glue or the potting glue is filled in 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 the potting glue is solidified. The module protection member 300 formed in this way can not only fix the battery module 200 in the box 100, but also stably support 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.

[0065] In one embodiment, the cell protection member 20 is formed by filling the second space 2000 with a fluid insulating material and then curing it. For example, after the cell group 1 is installed in the shell 9, the foam glue or the potting glue is filled in 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 the potting glue is cured. The cell protection member 20 formed in this way can not only fix the cell group 1 in the shell 9, but also stably support the cell group 1, and the cell protection member 20 formed by the insulating material can reduce the probability of leakage of the cell group 1 and improve the safety of the battery module 200.

[0066] Continue as Figure 4 Combination Figure 3 As shown, the housing 9 includes a frame 2, a cover plate 4 and a bottom plate 31. The frame 2 is a shell structure that penetrates up and down along the height direction of the box body 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, and then the battery 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 battery cell group 1. After the insulating material is cured, the battery cell protection member 20 is formed, and finally the cover plate 4 is fixed to the upper end of the frame 2.

[0067] In 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 an integrated structure to simplify the connection structure between the multiple battery modules 200 and improve the assembly efficiency between the multiple battery modules 200 .

[0068] For the convenience of description, the battery module 200 fixedly connected to the sealing plate 102 is defined as the first battery module 201, and the remaining battery modules 200 are marked in order from bottom to top. "In two adjacent battery modules 200, the bottom plate 31 of the upper shell and the cover plate 4 of the lower shell are an integrated structure" means that the bottom plate 31 of the second battery module 202 can be used as the cover plate 4 of the first battery module 201. Similarly, the bottom plate 31 of the third battery module 203 can be used as the cover plate 4 of the second battery module 202, and the bottom plate 31 of the fourth battery module 204 can be used as the cover plate 4 of the third battery module 203. Assembling multiple battery modules 200 in this way can not only improve assembly efficiency, but also reduce the overall weight of the battery pack. In other embodiments, the shell 9 of each battery module 200 may also have a frame 2, a cover plate 4 and a bottom plate 31. In this case, after a single battery module 200 is assembled, the battery modules 200 can be assembled together. When a single battery module 200 is assembled, multiple workers or automated assembly equipment can work at the same time, which can also improve the assembly efficiency.

[0069] In one embodiment, the housing 101 (see Figure 2 ) is provided between the connection portion and the sealing plate 102, and the sealing gasket is used to ensure a sealed connection between the cover shell 101 and the sealing plate 102 to prevent leakage of the insulating material when the insulating material is poured and cured to form the module protection member 300.

[0070] In the process of assembling the battery pack, first fix the first battery module 201 (without cover plate 4) on the sealing plate 102, then fix the second battery module 202 (without cover plate 4) on the first battery module 201, then fix the third battery module 203 (without cover plate 4) on the second battery module 202, and finally fix the fourth battery module 204 (with cover plate 4) on the third battery module 203, wherein two adjacent battery modules 200 are fixedly connected by fasteners, which can improve the connection strength between the battery modules 200, avoid misalignment between the battery modules 200, and thus improve the overall stability and safety of the battery pack. After all the battery modules 200 are assembled, the cover 101 is set outside all the battery modules 200, and the cover 101 is fixedly connected to the sealing plate 102.

[0071] In one embodiment, the battery cell group 1 includes a plurality of cylindrical battery cells arranged at intervals in the same plane. To facilitate the installation of the cylindrical battery cells, the battery module 200 further includes an insulating bracket 33, which is located above the bottom plate 31 and is used to support and install the battery cell group 1.

[0072] Since the battery cell group 1 will produce ejecta when it is in thermal runaway, causing the air pressure in the shell to increase, in order to prevent the battery cell group 1 from exploding under high-pressure ejecta, it is necessary to remove the excess ejecta in the shell in time. Therefore, the battery module 200 also includes a support member 32, which is located between the bottom plate 31 and the insulating bracket 33, so that a battery cell pressure relief channel 30 is formed between the bottom plate 31 and the insulating bracket 33, and the insulating bracket 33 has a pressure relief inlet 331 connected to the battery cell pressure relief channel 30 at a position corresponding to the explosion-proof valve of the cylindrical battery cell, and the bottom plate 31 has a pressure relief outlet 311 connected to the battery cell pressure relief channel 30. When the battery cell group 1 is in thermal runaway or the air pressure in the shell increases, the ejecta can enter the battery cell pressure relief channel 30 from the pressure relief inlet 331 of the insulating bracket 33, and then be discharged from the pressure relief outlet 311 of the bottom plate 31.

[0073] It is understandable that the insulating bracket 33 has a pressure relief inlet 331 corresponding to each cylindrical battery cell, and when the eruption escapes from the explosion-proof valve of each cylindrical battery cell, the eruption can enter the battery 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 to prevent the cylindrical battery cell from falling from the pressure relief inlet 331 into the battery cell pressure relief channel 30.

[0074] In one embodiment, there are multiple support members 32, and the multiple support members 32 are evenly spaced and arranged between the bottom plate 31 and the insulating bracket 33, so as to provide uniform and stable support force for the insulating bracket 33, and at the same time ensure that the battery cell pressure relief channel 30 has enough space for air flow. Since the battery cell pressure relief channel 30 is formed by the interval formed by the support member 32 between the bottom plate 31 and the insulating bracket 33, in order to ensure that the air flow can flow smoothly in the battery cell pressure relief channel 30, the projection area of ​​the support member 32 on the bottom plate 31 or the insulating bracket 33 is much smaller than the area of ​​the bottom plate 31 or the area of ​​the insulating bracket 33, so as to ensure that the battery cell pressure relief channel 30 has enough space for air flow. In addition, the support member 32 also serves as a supporting structure for supporting the insulating bracket 33 and the battery cell group 1 thereon. The support member 32 needs to be able to meet a certain support strength, and at the same time be able to provide a uniform and constant support force to the insulating bracket 33, so as to prevent the insulating bracket 33 from being deformed due to uneven force under the action of the support member 32 and the battery cell group 1. Figure 3 and Figure 4 In the example, the support member 32 is cylindrical, and the projected area of ​​a single support member 32 on the insulating bracket 33 is smaller than the diameter of the cylindrical battery cell and slightly larger than the interval between two adjacent cylindrical battery cells. The support member 32 can completely avoid the pressure relief inlet 331 of the insulating bracket 33, or it can partially block the pressure relief inlet 331, as long as it does not completely block the pressure relief inlet 331, to ensure that the ejecta generated by the explosion-proof valve of the cylindrical battery cell can smoothly enter the battery cell pressure relief channel 30 from the pressure relief inlet 331.

[0075] In one embodiment, the support member 32 is made of foam, which can provide excellent heat insulation, buffering, flame retardancy, support, shock absorption, etc. In one embodiment, the support member 32 can be fixedly connected to the bottom plate 31 and the insulating bracket 33 by double-sided adhesive.

[0076] Figure 5 Shows Figure 3 A partial enlarged view of the battery module 200. Figure 5 Combination Figure 4 As shown, the battery module 200 further includes a fireproof belt 5, which is arranged between the insulating bracket 33 and the battery cell group 1. The fireproof belt 5 is made of high temperature resistant material and has heat insulation and flame retardant effects.

[0077] In one embodiment, the battery module 200 further includes a liquid cooling system 6, which includes a plurality of liquid cooling plates and pipes connecting the plurality of liquid cooling plates, and a liquid cooling plate is provided between two adjacent rows of cylindrical cells to achieve cooling of the cylindrical cells. The lengths of the plurality of liquid cooling plates may be all the same, or all different, or not all the same. Specifically, the length of each liquid cooling plate is determined by the length of the two rows of cylindrical cells matched therewith, and is not limited here.

[0078] In one embodiment, the battery module 200 further includes an integrated busbar 7 (Cells Contact System, CCS for short) and an insulating cover plate 8. The CCS 7 is welded on the pole of the cylindrical cell. The cylindrical cell can be connected in series or in parallel through the CCS 7. The insulating cover plate 8 is glued to the CCS 7 and is used to insulate the cell and the box cover of the box 100. It can also prevent the valve from jumping when the cell is thermally out of control. For example, the insulating cover plate 8 can be a fiberglass board.

[0079] Figure 6 for Figure 3 A partial enlarged view of the battery pack. Figure 6 Combination Figure 4As shown, the battery pack also includes a pressure relief system 400, and the frames 2 of all battery modules 200 have sub-channels 220. The sub-channels 220 of all frames 2 are connected to form a module pressure relief channel 221, and the ejecta generated by the explosion-proof valve of the battery cell group 1 when it 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 ejecta in the module pressure relief channel 221 can be discharged outside the box 100 through the pressure relief system 400. The pressure relief scheme of the battery pack can reduce or even eliminate the need for exhaust pipes and fixed structures of the exhaust pipes between the battery modules 200. The module pressure relief channel 221 is formed only by the sub-channels 220 on the frame 2 of the stacked multiple battery modules 200. When the air pressure in the module pressure relief channel 221 is higher than the preset air pressure, part of the ejected material therein is discharged out of the box body 100 through the pressure relief system 400, which can not only improve the safety of the battery pack, but also realize the lightweight design of the battery pack and improve the energy density of the battery pack.

[0080] In one embodiment, the cell pressure relief channels 30 in all battery modules 200 are directly connected to the sub-channels 220 of their frames 2, so that the airflow in the cell pressure relief channels 30 can flow into the sub-channels 220. The sub-channels 220 of two adjacent frames 2 are connected through the pressure relief outlets 311 on each bottom plate 31. Specifically, the bottom plate 31 of the first battery module 201 is fixed on the sealing plate 102, and the pressure relief outlet 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 pressure relief outlet 311 thereon is connected to 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 pressure relief outlet 311 thereon is connected to 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 pressure relief outlet 311 thereon is connected to the sub-channel 220 of the third battery module 203, thereby realizing the connection between the sub-channels 220 of the four battery modules 200.

[0081] Figure 7 FIG. 2 shows a schematic structural diagram of a frame 2 of a battery module 200 provided in the present application. Figure 7 Combination Figure 6As shown, the frame 2 includes a frame body 21 and a channel member 22. The frame body 21 is a shell structure that penetrates up and down along the height direction of the box body 100. The channel member 22 is fixed to the inner wall of the frame body 21. The channel member 22 cooperates with the inner wall of the frame body 21 to form a sub-channel 220 or the channel member 22 has a sub-channel 220. The sub-channel 220 penetrates the channel member 22 along the height direction of the box body 100. In one embodiment, the frame body 21 and the channel member 22 are an integrally formed structure, which can not only improve the overall structural strength of the frame 2, but also save the assembly time of the frame 2 and improve the assembly efficiency of the battery module 200.

[0082] Since all the sub-channels 220 are interconnected, as long as a pressure relief port 222 connected to the sub-channel 220 is opened on the outer wall of a frame 2, and then the inlet of the pressure relief system 400 is connected to the pressure relief port 222, the ejected material in the module pressure relief channel 221 can be discharged from the pressure relief system 400.

[0083] Figure 8 FIG. 4 shows a schematic diagram of the structure of the pressure relief system 400 provided in the present application. Figure 8 Combination Figure 6 As shown, the pressure relief system 400 includes a mounting plate 401, a connecting 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 mounted on the mounting plate 401 and is located outside the box body 100. The first end of the connecting pipe 402 is mounted on the mounting plate 401 and is arranged around the inlet of the pressure relief valve 403, and the second end thereof is arranged around the pressure relief port 222. Further, the box body 100 has a hole for mounting the mounting plate 401. The second end of the connecting pipe 402 passes through the hole and is sealed and matched with the side wall of the frame 2. The mounting plate 401 is located outside the hole and is sealed and fixedly connected with the outer wall of the box body 100.

[0084] The pressure relief system 400 further includes a breathable valve 404, which is mounted on the mounting plate 401 and located outside the box 100. The breathable valve 404 is used to achieve air pressure balance between the inside and outside of the box 100. Specifically, the pressure relief valve 403 is used to release pressure when the air pressure in the box 100 exceeds a preset value to prevent excessive increase in the air pressure in the box 100; the breathable valve 404 is used to ventilate when the air pressure in the box 100 is lower than a preset value to ensure air pressure balance inside and outside the box 100.

[0085] In one embodiment, the frame 2 of the second battery module 202 and the frame 2 of the third battery module 203 both have a pressure relief port 222, the pressure relief system 400 is connected to the two pressure relief ports 222, and the pressure relief valve 403 and the air valve 404 of the pressure relief system 400 are arranged at intervals along the stacking direction of the second battery module 202 and the third battery module 203.

[0086] In one embodiment, the connecting pipe 402 includes a pipe portion 4021 and a sealing portion 4022. One end of the pipe portion 4021 is fixed on the mounting plate 401 and is arranged around the pressure relief valve 403. The other end of the pipe portion 4021 is connected to the sealing portion 4022. The sealing portion 4022 is used to seal with the outer wall of the frame 2 and to make the pressure relief port 222 on the frame 2 located in the pipe portion 4021, so that the ejecta in the module pressure relief channel 221 can enter the pipe portion 4021 from the pressure relief port 222. When the pressure of the ejecta is greater than the preset pressure, the ejecta can be discharged from the pressure relief valve 403.

[0087] When the second battery module 202 and the third battery module 203 are stacked in an offset manner, the end surface of the sealing portion 4022 that is sealed with the frame 2 of the battery module 200 has a first sealing surface 40221 and a second sealing surface 40222 that are arranged in a stepped manner. The first sealing surface 40221 is sealed with the frame 2 of the second battery module 202, and the second sealing surface 40222 is sealed with the frame 2 of the third battery module 203.

[0088] The battery module 200 provided in the present application improves the frame 2 of its shell 9 to facilitate the fixed connection between the offset and stacked shells 9 and improve the stability of each shell 9.

[0089] Fig. 9 It shows a schematic structural diagram of two adjacent frames 2 in a connected state. Fig.10 FIG. 2 shows a schematic diagram of the structure of two adjacent frames 2 in a disassembled state. Figures 9 and 10 Combined with Figure 6 As shown, the end of any frame 2 close to another frame 2 has a transition portion 23 at both ends in the first direction, one of the two transition portions 23 is located inside the frame 2, and the other is located outside the frame 2, and the transition portion 23 of one frame 2 located inside the frame 2 is fixedly connected to the transition portion 23 of the adjacent frame 2 located outside the frame 2, and the transition portion 23 located outside the frame 2 is fixedly connected to the transition portion 23 of the adjacent frame 2 located inside the frame 2. This arrangement facilitates the fixed connection between the frames 2.

[0090] The frame 2 adjacent to the sealing plate 102 has adapters 23 at both ends of the first direction at its end close to the sealing plate 102, and the two adapters 23 are fixedly connected to the sealing plate 102. This arrangement facilitates the fixed connection between the frame 2 adjacent to the sealing plate 102 and the sealing plate 102. In one embodiment, one of the two adapters 23 is located inside the frame 2, and the other is located outside the frame 2; or both adapters 23 are located inside the frame 2; or both adapters 23 are located outside the frame 2, and these three arrangements can all achieve the connection between the frame 2 and the sealing plate 102.

[0091] The end of the frame 2 farthest from the sealing plate 102 has adapters 23 at both ends of the first direction, and the two adapters are used to be fixedly connected to the cover plate 4. In one embodiment, one of the two adapters 23 is located inside the frame 2, and the other is located outside the frame 2; or both adapters 23 are located inside the frame 2; or both adapters 23 are located outside the frame 2, and these three configurations can all achieve the connection between the frame 2 and the cover plate 4.

[0092] Fig.11 Shows Figure 6 A cross-sectional view of two adjacent frames 2 at the transition portion 23 at one end in the first direction. Fig.12 Shows Figure 6 A cross-sectional view of two adjacent frames 2 at the connecting portion 23 at the other end in the first direction. Figure 11 to Figure 12 Combined with Figure 6 , Figure 3 As shown, for the convenience of description, the frame 2 of the first battery module 201 is recorded as the first frame 211, the frame 2 of the second battery module 202 is recorded as the second frame 212, the frame 2 of the third battery module 203 is recorded as the third frame 213, and the frame 2 of the fourth battery module 204 is recorded 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 recorded as the upper inner adapter 231 and the lower inner adapter 233, and the upper and lower adapters located outside the frame 2 are recorded as the upper outer adapter 232 and the lower outer adapter 234.

[0093] Among them, the lower ends of the first frame 211, the second frame 212, the third frame 213 and the fourth frame 214 have a lower inner transition portion 233 and a lower outer transition portion 234 at both ends of the first direction, the upper ends of the first frame 211, the second frame 212 and the third frame 213 have an upper outer transition portion 232 and an upper inner transition portion 231 at both ends of the first direction, and the upper end of the fourth frame 214 has an upper inner transition portion 231 at both ends of the first direction.

[0094] The connection relationship between the frames 2 is as follows: the lower inner transition part 233 and the lower outer transition part 234 at the lower end of the first frame 211 are fixedly connected to the corresponding bottom plate 31 and then fixedly connected to the sealing plate 102; the lower inner transition part 233 at the lower end of the second frame 212 is fixedly connected to the upper outer transition part 232 at the upper end of the first frame 211, and its lower outer transition part 234 is fixedly connected to the upper inner transition part 231 at the upper end of the first frame 211; the lower inner transition part 233 at the lower end of the third frame 213 is fixedly connected to the second The upper outer transition portion 232 at the upper end of the frame 212 is fixedly connected, and its lower inner transition portion 233 is fixedly connected to the upper outer transition portion 232 at the upper end of the second frame 212; the lower inner transition portion 233 at the lower end of the fourth frame 214 is fixedly connected to the upper outer transition portion 232 at the upper end of the third frame 213, and its lower inner transition portion 233 is fixedly connected to the upper outer transition portion 232 at the upper end of the third frame 213; the two upper inner transition portions 231 at the upper end of the fourth frame 214 are both used to be fixedly connected to the cover plate 4.

[0095] The upper inner transition parts 231 at the upper ends of the first frame 211, the second frame 212, the third frame 213, and the fourth frame 214 are all detachably fixedly connected to the corresponding frame 2; the lower outer transition parts 234 and the lower inner transition parts 233 at the lower ends of the first frame 211, the second frame 212, the third frame 213, and the fourth frame 214 are all integrally formed with the corresponding frame 2; the upper outer transition parts 232 at the upper ends of the first frame 211, the second frame 212, and the third frame 213 are all integrally formed with the corresponding frame 2. Of course, in other embodiments, whether the transition parts 23 are integrally formed with the frame 2 or detachably fixedly connected can be designed according to specific needs, all the transition parts 23 of a frame 2 are integrally formed with the frame 2; or all the transition parts 23 of a frame 2 are detachably fixedly connected to the frame 2; or some of the transition parts 23 of a frame 2 are integrally formed with the frame 2, and some of the transition parts 23 are detachably fixedly connected to the frame 2, which is not limited here.

[0096] When the adapter 23 and the frame 2 are detachably fixedly connected, the side wall of the frame 2 has a through hole, the side of the adapter 23 has a first threaded hole, and the bolt passes through the through hole of the side wall of the frame 2 and is threadedly connected to the threaded hole of the adapter 23 to achieve a fixed connection between the adapter 23 and the frame 2. The top surface of the adapter 23 has a second threaded hole, and the bottom plate 31 or the cover plate 4 or the adapter 23 of other frames 2 is threadedly connected to the second threaded hole through a bolt. The first threaded hole and the second threaded hole are staggered in the horizontal plane.

[0097] The upper inner transition parts 231 at the upper ends of the first frame 211, the second frame 212, the third frame 213, and the fourth frame 214 are all plastic transition parts. In order to ensure the connection strength between the frame 2 and the upper inner transition part 231 and between the bottom plate 31 (cover plate 4) and the upper inner transition part 231, the first threaded hole and the second threaded hole on the upper inner transition part 231 are formed by metal braces installed in the upper inner transition part 231. Specifically, the upper inner transition part 231 has a first through hole and a second through hole, and the metal braces are fixed in the first through hole to form a first threaded hole, and the metal braces are fixed in the second through hole to form a second threaded hole.

[0098] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the above embodiments do not limit the present application in any form, and any technical solution obtained by equivalent replacement or equivalent transformation falls within the protection scope of the present application.

Claims

1. A battery pack, characterized in that: include: A box body (100) comprises a cover shell (101) and a sealing plate (102) fixed to an open end of the cover shell (101), wherein 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 body (100) along the height direction of the box body (100) and arranged in a staggered manner. The plurality of battery modules (200) are installed in sequence along the inclined direction of the first surrounding wall surface (1012).

2. The battery pack according to claim 1, characterized in that: The angle between the first surrounding wall surface (1012) and the sealing plate (102) ranges from 60° to 75°.

3. The battery pack according to claim 1, characterized in that: The housing further comprises a second surrounding wall surface (1013), wherein the second surrounding wall surface (1013) is arranged opposite to the first surrounding wall surface (1012) and is at least partially parallel to the first surrounding wall surface (1012).

4. The battery pack according to claim 1, characterized in that: The battery modules (200) each comprise a frame (2) and a battery cell group (1); the frame (2) comprises a casing structure that penetrates vertically along the height direction of the box body (100); the battery cell group (1) is accommodated in the frame (2), and the frames (2) of two adjacent battery modules (200) are fixedly connected.

5. The battery pack according to claim 4, characterized in that: Both ends of the end of any frame (2) close to the other frame (2) are provided with transition parts (23); one of the two transition parts (23) is located inside the frame (2), and the other is located outside the frame (2); the transition part (23) located inside the frame (2) of one frame (2) is fixedly connected to the transition part (23) located outside the frame (2) of the adjacent frame (2); and the transition part (23) located outside the frame (2) is fixedly connected to the transition part (23) located inside the frame (2) of the adjacent frame (2).

6. The battery pack according to claim 4, characterized in that: The frame (2) adjacent to the sealing plate (102) has a transition portion (23) at its end close to the sealing plate (102), and the transition portion (23) is fixedly connected to the sealing plate (102).

7. The battery pack according to claim 4, characterized in that: The battery module (200) further comprises a cover plate (4), and the frame (2) farthest from the sealing plate (102) has a transition portion (23) at its end away from the sealing plate (102), and the transition portion (23) is fixedly connected to the cover plate (4).

8. The battery pack according to claim 6 or 7, characterized in that: One of the two transition parts (23) is located inside the frame (2), and the other is located outside the frame (2); or both of the transition parts (23) are located inside the frame (2).

9. The battery pack according to any one of claims 4 to 7, characterized in that: All the adapter parts (23) of a frame (2) are integrally formed with the frame (2); or All the adapter parts (23) of a frame (2) are detachably fixedly connected to the frame (2); or A partial adapter portion (23) of a frame (2) is integrally formed with the frame (2), and the partial adapter portion (23) is detachably fixedly connected to the frame (2).

10. A vehicle, characterized in that: It comprises a chassis, a seat and a battery pack as described in any one of claims 1 to 9, wherein the seat and the battery pack are both installed on the chassis, and the battery pack is located behind the backrest of the seat, and the first surrounding wall surface (1012) is arranged opposite to the backrest.

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