battery pack

Abstract

This application provides a battery pack, comprising: a housing space located inside the battery pack; a plurality of battery cell groups disposed within the housing space; a heat exchange assembly including a heat exchange plate, one side of which faces the housing space for heat exchange with the battery cell groups; a mounting groove formed on the surface of the heat exchange plate; and a fire extinguishing conduit, partially embedded in the mounting groove and partially extending into the housing space, wherein the portion of the fire extinguishing conduit within the housing space forms a medium outlet for discharging a fire extinguishing medium. The battery pack provided by this application helps to improve the energy density of the battery pack.

Description

Technical Field

[0001] This application relates to the field of energy storage technology, and more particularly to a battery pack. Background Technology

[0002] To prevent thermal runaway, fire, or explosion caused by misuse or abnormal conditions during the use of energy storage products, fire protection designs are incorporated at the product level.

[0003] For example, fire protection design at the battery pack level means that after a thermal safety event is detected in a battery pack inside the energy storage container, the specific battery pack is located and targeted fire protection measures are implemented, including spraying fire extinguishing and cooling media into the battery pack using fire protection structural components that extend into the battery pack.

[0004] However, fire-fighting structural components installed inside the battery pack occupy a significant amount of internal space, resulting in a lower energy density for the battery pack. Utility Model Content

[0005] In view of this, the purpose of this application is to provide a battery pack that at least partially solves the problem of low energy density of the battery pack caused by the installation of fire-fighting structural components that occupy a large space within the battery pack.

[0006] Based on the above objectives, this application provides a battery pack, comprising: a housing space located inside the battery pack; a plurality of battery cell groups disposed within the housing space; a heat exchange assembly including a heat exchange plate, one side of the heat exchange plate facing the housing space for heat exchange with the battery cell groups; the other side of the heat exchange plate facing away from the housing space and forming a mounting groove; and a fire extinguishing pipeline, a portion of which is located outside the housing space and embedded in the mounting groove, and another portion extending into the housing space, wherein the portion of the fire extinguishing pipeline located within the housing space has a medium outlet for discharging a fire extinguishing medium.

[0007] Optionally, the heat exchange plate has multiple parallel channels inside, some of which are configured as heat exchange channels for the flow of heat exchange medium, and the side wall of another part of the channels away from the receiving space is open to form the mounting groove; the mounting groove is isolated from the heat exchange channels.

[0008] Optionally, the fire extinguishing pipeline includes a medium inlet, a first pipeline section, and a second pipeline section; the first pipeline section is at least partially embedded in the mounting groove and communicates with the medium inlet located outside the receiving space; the second pipeline section is at least partially located within the receiving space and communicates with the medium outlet, and the second pipeline section passes through the surface of the heat exchange plate near the battery pack to communicate with the first pipeline section.

[0009] Optionally, each of the battery cell groups includes a plurality of battery cells stacked along a first direction; the heat exchange channel extends to both ends of the heat exchange plate along the first direction; the battery pack includes two first crossbeams, which are connected one-to-one with both ends of the heat exchange plate along the first direction; the first crossbeams block the opening of the heat exchange channel located at the end of the heat exchange plate; an inlet connector and an outlet connector are provided on the side of the heat exchange plate near the battery cell group, the inlet connector and the outlet connector are respectively connected to the heat exchange channel and extend through the first crossbeam into the receiving space; the medium inlet is located on the side of the first crossbeam away from the heat exchange plate along the first direction and is connected to the first pipeline section through the first crossbeam.

[0010] Optionally, at least a portion of the first crossbeam includes a crossbeam body and a fire extinguishing connector that are spliced ​​together. A fire extinguishing flow channel is formed within the fire extinguishing connector. The first pipeline section is connected to the fire extinguishing flow channel. A fire extinguishing input connector is formed on the side of the fire extinguishing connector away from the heat exchange plate along the first direction. One end of the fire extinguishing input connector is open and connected to the fire extinguishing flow channel, and the other end is open and configured as the medium inlet.

[0011] Optionally, the fire extinguishing flow channel extends along a second direction, and at least two first pipe sections are spaced apart along the second direction, with each of the at least two first pipe sections connected to the fire extinguishing flow channel; the second direction is the extension direction of the first crossbeam.

[0012] Optionally, the battery pack includes two first longitudinal beams connected to the heat exchange plate. The two first longitudinal beams are disposed on opposite sides of the heat exchange plate along the second direction. The two first longitudinal beams are connected by two first crossbeams to form a frame structure. A middle crossbeam is disposed on the plate surface of the heat exchange plate near the cell assembly. The middle crossbeam is connected to the two first longitudinal beams. The second pipeline section passes through the middle crossbeam to communicate with the first pipeline section.

[0013] Optionally, a middle plate is connected to the side of the intermediate crossbeam away from the heat exchange plate, and multiple battery cell groups are respectively arranged on opposite sides of the middle plate; the second pipeline section passes through the middle plate.

[0014] Optionally, the end of the second pipeline section furthest from the heat exchange plate extends out of the middle plate and is connected to a nozzle; the nozzle has a medium outlet on at least two circumferential sidewalls that are arranged opposite each other along the first direction.

[0015] Optionally, the battery pack includes an upper housing, and the heat exchange plate and the frame structure connected around the heat exchange plate form a lower housing. The upper housing and the lower housing are connected and enclosed to define the accommodating space.

[0016] As can be seen from the above, the battery pack provided in this application has an installation groove formed on the heat exchange plate. A portion of the fire extinguishing pipeline used to transport the fire extinguishing medium can be embedded into the installation groove, so that this portion of the fire extinguishing pipeline overlaps with the heat exchange plate and no longer occupies additional space. Therefore, the overall space occupied by the fire extinguishing pipeline in the battery pack can be reduced, which helps to improve the energy density of the battery pack. The fire extinguishing medium transported by the fire extinguishing pipeline can ultimately be sprayed out through the medium outlet located in the containment space and act on the battery cell assembly, thereby achieving the purpose of fire extinguishing and cooling. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in this application or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a partial exploded view of the battery pack of the first structure according to an embodiment of this application;

[0019] Figure 2 This is a partial cross-sectional schematic diagram of the battery pack with the second structure according to an embodiment of this application;

[0020] Figure 3 for Figure 2 An enlarged schematic diagram of part A in the middle;

[0021] Figure 4 This is a partial exploded view of a battery pack with a second structure according to an embodiment of this application;

[0022] Figure 5 This is a partial exploded view of the bottom of the battery pack according to the second structure of this application embodiment;

[0023] Figure 6 for Figure 5 Enlarged schematic diagram of part B in the middle;

[0024] Figure 7 This is a partial schematic diagram of the bottom of the battery pack according to the second structure of this application embodiment;

[0025] Figure 8 This is a partial cross-sectional schematic diagram of the fire extinguishing pipeline of a battery pack with a third structure according to an embodiment of this application.

[0026] Figure 9 for Figure 7 Partial cross-sectional view of the CC section;

[0027] Figure 10 for Figure 9 An enlarged schematic diagram of section E in the middle;

[0028] Figure 11 for Figure 8 Schematic diagram of the cross section DD in the middle.

[0029] Explanation of reference numerals in the attached figures:

[0030] 100. Upper housing; 200. Lower housing; 300. Cell module; 310. Cell assembly; 320. Middle plate; 330. End plate; 400. Accommodation space;

[0031] 500. Heat exchange assembly; 510. Heat exchange plate; 511. Heat exchange channel; 512. Mounting slot; 520. Liquid inlet connector; 530. Liquid outlet connector;

[0032] 600 Fire extinguishing piping; 610 Fire extinguishing input connector; 611 Medium inlet; 620 Nozzle; 621 Medium outlet; 630 First piping section; 640 Second piping section; 650 Fire extinguishing connection connector;

[0033] 700. First crossbeam; 710. Crossbeam body; 711. Splicing groove; 720. Fire extinguishing connecting component; 721. Fire extinguishing flow channel;

[0034] 800, First longitudinal beam; 900, Middle cross beam. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0036] It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components described in these embodiments do not limit the scope of this application.

[0037] At the same time, it should be understood that, for ease of description, the dimensions of the various parts shown in the accompanying drawings are not drawn according to actual scale.

[0038] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the scope of this application and its application or use.

[0039] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in the embodiments of this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0040] Figure 1 A partial exploded view of the battery pack with the first structure is shown.

[0041] like Figure 1 The battery pack includes an upper housing 100 and a lower housing 200 connected to each other, which together enclose the interior of the battery pack and define a space for accommodating the battery cell assembly 310. If a fire-fighting structural component is installed on the battery pack, then part of the fire-fighting structural component needs to be located outside the aforementioned space to communicate with the output port of an external fire extinguishing medium supply device, and another part needs to be located inside the aforementioned space to spray the fire extinguishing medium from the fire extinguishing medium supply device onto the battery cell assembly 310. Therefore, the fire-fighting structural component will inevitably occupy additional external and internal space of the battery pack. When the additional space occupied by the fire-fighting structural component is large, it will not only result in a larger overall size of the battery pack, but also reduce the space used to house the battery cell assembly 310, leading to a lower energy density of the battery pack.

[0042] To avoid the above problems, some fire protection structural components can be embedded in other structural components of the battery pack to reduce the additional space occupied by the fire protection structural components in the battery pack.

[0043] Specifically, Figure 2 A partial cross-sectional diagram of the second type of battery pack is shown. Figure 3 Showing Figure 2 An enlarged diagram of part A in the middle. Figure 4 A partial exploded view of the second type of battery pack is shown.

[0044] like Figure 2 In some embodiments, the battery pack includes: a housing space 400 located inside the battery pack; and a plurality of cell groups 310 disposed within the housing space 400.

[0045] For example, each cell pack 310 includes cells along a first direction (e.g., Figure 2 Multiple battery cells stacked (in the X direction). Multiple battery cell groups 310 can be arranged side-by-side within a receiving space 400 to form at least one battery cell module 300, each battery cell module 300 including at least two battery cell groups 310 arranged along a first direction. Figure 4 When multiple battery cell modules 300 are arranged within the accommodating space 400, the multiple battery cell modules 300 can be arranged along the second direction (e.g., Figure 4 The first direction is arranged in the Y direction, and the second direction is perpendicular to the first direction.

[0046] For example, in the same cell module 300, two end plates 330 can be arranged along a first direction, all cell groups 310 are disposed between the two end plates 330, and a middle plate 320 is disposed between two adjacent cell groups 310. All cell groups 310 in the same cell module 300 can be connected into a whole by the end plates 330 and the middle plate 320. For example, the middle plate 320 and the end plates 330 can be connected by binding, so that the middle plate 320 and the end plates 330 clamp the cell group 310 between them.

[0047] Figure 5 A partial exploded view of the bottom of the battery pack with the second structure is shown.

[0048] like Figure 4 and Figure 5 The battery pack also includes a heat exchange assembly 500, which includes a heat exchange plate 510. One side of the heat exchange plate 510 faces the receiving space 400 and is used for heat exchange with the cell assembly 310. The other side of the heat exchange plate 510 faces away from the receiving space 400 and has a mounting groove 512.

[0049] Figure 7 A partial schematic diagram of the bottom of the battery pack with the second structure is shown.

[0050] like Figure 2 , Figure 3 and Figure 7 The battery pack also includes a fire extinguishing line 600, a portion of which is located outside the receiving space 400 and embedded in the mounting groove 512, and another portion extending into the receiving space 400. The portion of the fire extinguishing line 600 located inside the receiving space 400 has a medium outlet 621 for dispensing fire extinguishing medium.

[0051] For example, the heat exchange plate 510 exchanges heat with the battery cell assembly 310, which can cool the battery cell assembly 310 or heat it up.

[0052] For example, the accommodating space 400 can be the entire space defined by the upper box 100 and the lower box 200, or it can be a part of the entire space.

[0053] For example, the portion of the fire extinguishing pipe 600 embedded in the mounting groove 512 can be connected to the mounting groove 512 by means of adhesive, snap-fit, heat pressing or fasteners.

[0054] For example, the extinguishing medium transported through the fire extinguishing pipeline 600 can be a liquid extinguishing medium, a foam extinguishing medium, a dry powder extinguishing medium, a gaseous extinguishing medium, or other extinguishing media that can extinguish fire and cool down.

[0055] For example, the heat exchange plate 510 may be part of the upper housing 100 or the lower housing 200, or it may be independent of the upper housing 100 and the lower housing 200 and installed in the receiving space 400.

[0056] For example, the mounting groove 512 can be disposed on the plate surface of the heat exchange plate 510 near the cell assembly 310, or it can be disposed on the plate surface away from the cell assembly 310.

[0057] For example, the shape of the outer contour of the cross section of the portion of the fire extinguishing pipe 600 that is embedded in the mounting groove 512 may be the same as or similar to the cross section shape of the mounting groove 512.

[0058] In this embodiment, a mounting groove 512 is provided on the heat exchange plate 510, which can embed part of the fire extinguishing pipe 600 into the mounting groove 512. The part of the fire extinguishing pipe 600 embedded in the mounting groove 512 overlaps with the heat exchange plate 510, and no longer occupies the internal or external space of the battery pack.

[0059] When the battery cell assembly 310 in the battery pack's containment space 400 experiences thermal runaway, the fire extinguishing medium supply device can deliver fire extinguishing medium to the fire extinguishing pipeline 600. The fire extinguishing pipeline 600 delivers the fire extinguishing medium into the containment space 400 and sprays it out from the medium outlet 621, acting on the battery cell assembly 310 in the containment space 400.

[0060] The battery pack provided in this embodiment has a mounting groove 512 formed on the heat exchange plate 510. A portion of the fire extinguishing pipeline 600 used to transport the fire extinguishing medium can be embedded in the mounting groove 512, so that this portion of the fire extinguishing pipeline 600 overlaps with the heat exchange plate 510 and no longer occupies additional space. Therefore, the space occupied by the fire extinguishing pipeline 600 as a whole in the battery pack can be reduced, which helps to improve the energy density of the battery pack. The fire extinguishing medium transported by the fire extinguishing pipeline 600 can finally be sprayed out through the medium outlet 621 located in the receiving space 400 and act on the battery cell assembly 310, thereby achieving the purpose of fire extinguishing and cooling.

[0061] Figure 6Showing Figure 5 Enlarged diagram of part B.

[0062] like Figure 5 and Figure 6 In some embodiments, the heat exchange plate 510 has multiple parallel channels inside. Some channels are configured as heat exchange channels 511 for the flow of heat exchange medium, and the side wall of another part of the channels away from the accommodating space is open to form an installation groove 512. The installation groove 512 is isolated from the heat exchange channels 511.

[0063] For example, the heat exchange channel 511 can be a harmonica tube channel, which extends linearly from one end of the heat exchange plate 510 to the other end; or, the heat exchange channel 511 can also be a serpentine channel.

[0064] For example, the mounting groove 512 and other heat exchange channels 511 can be separated by welding, installing seals or sealing with adhesive. Of course, the heat exchange plate 510 can also be manufactured by an integral extrusion structure to simultaneously form a closed heat exchange channel 511 and an open mounting groove 512.

[0065] It should be noted that, in order to ensure heat exchange efficiency, the thickness of the heat exchange plate 510 is usually small. Furthermore, when the heat exchange plate 510 is installed inside the battery pack, a larger thickness would result in a lower energy density of the battery pack. If the heat exchange channel 511 and the mounting groove 512 are stacked along the thickness direction of the heat exchange plate 510, the depth of the mounting groove 512 will be smaller. Consequently, the volume of the portion of the fire extinguishing pipeline 600 embedded in the mounting groove 512 will also be smaller, resulting in a poorer ability to transport the fire extinguishing medium.

[0066] Therefore, in this embodiment, a portion of the multiple channels in the heat exchange plate 510 is selected for structural modification, so that the selected channels extend through the surface of the heat exchange plate 510 to form a deeper mounting groove 512, providing sufficient space for embedding the fire extinguishing pipeline 600. The other unselected channels continue to be used to transport the heat exchange medium, so that the heat exchange plate 510 maintains its heat exchange capacity.

[0067] It should also be noted that since there are a large number of channels in the heat exchange plate 510, constructing a small portion of them as mounting slots 512 will not have a significant impact on the heat exchange efficiency of the heat exchange plate 510. While improving the energy density of the battery pack, the heat exchange capacity of the heat exchange plate 510 can also be guaranteed, thus ensuring the electrical performance of the battery pack.

[0068] Figure 9 Showing Figure 7 A partial cross-sectional view of the CC section. Figure 10 Showing Figure 9 An enlarged schematic diagram of section E in the middle.

[0069] like Figure 4 and Figure 5 In some embodiments, the mounting groove 512 is formed on the surface of the heat exchange plate 510 away from the cell assembly 310. For example... Figure 2 , Figure 3 , Figure 6 , Figure 9 and Figure 10 The fire extinguishing pipeline 600 includes a medium inlet 611, a first pipeline section 630, and a second pipeline section 640. The first pipeline section 630 is at least partially embedded in the mounting groove 512 and communicates with the medium inlet 611 located outside the receiving space 400. The second pipeline section 640 is at least partially located within the receiving space 400 and communicates with the medium outlet 611. The second pipeline section 640 passes through the heat exchange plate 510 near the battery cell assembly 310 to communicate with the first pipeline section 630.

[0070] For example, the first pipe segment 630 and the second pipe segment 640 can be integrally formed and connected. Figure 8 A partial cross-sectional diagram of the fire suppression piping of the third type of battery pack is shown, as follows: Figure 8 The first pipe section 630 and the second pipe section 640 can also be connected by a fire extinguishing connection joint 650.

[0071] For example, the surface of the heat exchange plate 510 that is away from the battery cell assembly 310 may be exposed, or covered by the upper housing 100, or covered by the lower housing 200.

[0072] For example, a through hole connecting the mounting groove 512 can be provided on the plate surface of the heat exchange plate 510 near the battery cell assembly 310, and the second pipe section 640 can pass through the through hole to communicate with the first pipe section 630 in the mounting groove 512.

[0073] The fire extinguishing medium supply device can be connected to the medium inlet 611 located outside the containment space 400 to transfer the fire extinguishing medium to the medium inlet 611. The fire extinguishing medium enters the first pipeline section 630 through the medium inlet 611, and after flowing through the first pipeline section 630 and the second pipeline section 640 in sequence, it is sprayed out through the medium outlet 621 located inside the containment space 400.

[0074] Combination Figure 2 , Figure 4 and Figure 5It can be seen that when the mounting groove 512 is formed on the surface of the heat exchange plate 510 away from the battery cell assembly 310, the surface of the heat exchange plate 510 near the battery cell assembly 310 can form a relatively complete and flat surface, which facilitates the installation of the battery cell assembly 310 and other structural components that need to be installed within the accommodating space 400. Simultaneously, when the surface of the heat exchange plate 510 used for heat exchange with the battery cell assembly 310 is relatively complete, it also helps to increase the contact area between the heat exchange plate 510 and the battery cell assembly 310, thereby improving the heat exchange efficiency of the heat exchange plate 510.

[0075] like Figure 2 , Figure 4 , Figure 5 and Figure 6 In some embodiments, each cell pack 310 includes a plurality of cells stacked along a first direction; a heat exchange channel 511 extends to both ends of the heat exchange plate 510 along the first direction; the battery pack includes two first crossbeams 700, which are connected one-to-one with the two ends of the heat exchange plate 510 along the first direction; the first crossbeams 700 block the openings of the heat exchange channel 511 at the ends of the heat exchange plate 510; a liquid inlet connector 520 and a liquid outlet connector 530 are provided on the side of the heat exchange plate 510 near the cell pack 310, which are respectively connected to the heat exchange channel 511 and extend through the first crossbeams 700 into the receiving space 400; a medium inlet 611 is provided along the first direction on the side of the first crossbeams 700 away from the heat exchange plate 510 and is connected to the first pipeline section 630 through the first crossbeams 700.

[0076] For example, when the heat exchange channel 511 is a serpentine channel, the liquid inlet connector 520 is connected to the liquid inlet end of the heat exchange channel 511, and the liquid outlet connector 530 is connected to the liquid outlet end of the heat exchange channel 511.

[0077] For example, when the heat exchange channel 511 is a harmonica tube channel, the liquid inlet connector 520 can be connected to the liquid inlet end of multiple heat exchange channels 511 through the liquid inlet manifold, and the liquid outlet connector 530 can be connected to the liquid outlet end of multiple heat exchange channels 511 through the liquid outlet manifold.

[0078] For example, the first pipe section 630 can pass through the first crossbeam 700 and communicate with the medium inlet 611, or a flow channel can be provided in the first crossbeam 700, and the first pipe section 630 and the medium inlet 611 are respectively connected to the flow channel.

[0079] For example, when there are multiple first pipe segments 630, the multiple first pipe segments 630 can be connected to the first crossbeam 700 after converging, or they can be connected to the first crossbeam 700 separately.

[0080] For example, the opening of the liquid inlet connector 520 extending out of the receiving space 400 can be connected to the output port of the heat exchange medium supply device outside the receiving space 400, and the opening of the liquid outlet connector 530 extending out of the receiving space 400 can be connected to the input port of the heat exchange medium recovery device outside the receiving space 400.

[0081] For example, the first crossbeam 700 can be connected to the heat exchange plate 510 by means of welding, gluing, snap-fitting or fasteners.

[0082] For example, the medium inlet 611, the liquid inlet connector 520, and the liquid outlet connector 530 can be connected to the same first crossbeam 700 or to different first crossbeams 700. Furthermore, when all three are connected to the same first crossbeam 700, the medium inlet 611 and the opening of the liquid inlet connector 520 away from the heat exchange plate 510 can be located on the same side of the first crossbeam 700 or on different sides; similarly, the medium inlet 611 and the opening of the liquid outlet connector 530 away from the heat exchange plate 510 can be located on the same side of the first crossbeam 700 or on different sides.

[0083] In this embodiment, the heat exchange channel 511 extends along the first direction to the end of the heat exchange plate 510, so that the orthographic projection of the heat exchange channel 511 along the thickness direction of the heat exchange plate 510 onto the plate surface can cover a large area of ​​the plate surface, which helps to improve the heat exchange efficiency of the heat exchange plate 510. Simultaneously, when the heat exchange channel 511 is a harmonica tube channel, it also helps to reduce the manufacturing cost of the heat exchange plate 510. In this embodiment, the opening of the heat exchange channel 511 at the end of the heat exchange plate 510 is sealed by two first crossbeams 700 connected to the heat exchange plate 510, thus forming a closed channel.

[0084] When the battery pack is in use, the heat exchange medium supply device injects heat exchange medium into the heat exchange channel 511 through the liquid inlet connector 520. After flowing through the heat exchange channel 511, the heat exchange medium flows out through the liquid outlet connector 530 and is recovered by the heat exchange medium recovery device.

[0085] Combination Figure 4 It can be understood that the side of the first crossbeam 700 away from the heat exchange plate 510 along the first direction is the circumferential outer side of the battery pack. Setting the medium inlet 611 on this side of the first crossbeam 700 facilitates the connection of the medium inlet 611 with the fire extinguishing medium supply device. At the same time, it also makes the bottom surface of the first crossbeam 700 a flat surface, which facilitates the fixing of the battery pack inside the energy storage container or the electrical device.

[0086] like Figure 5 and Figure 6In some embodiments, at least part of the first crossbeam 700 includes a crossbeam body 710 and a fire extinguishing connector 720 connected together. A fire extinguishing flow channel 721 is formed in the fire extinguishing connector 720. The first pipeline section 630 is connected to the fire extinguishing flow channel 721. A fire extinguishing input connector 610 is formed on the side of the fire extinguishing connector 720 away from the heat exchange plate 510 along the first direction. One end of the fire extinguishing input connector 610 is connected to the fire extinguishing flow channel 721, and the other end is configured as a medium inlet 611.

[0087] For example, the heat exchange channel 511 is a harmonica tube channel extending in a first direction, and correspondingly, the first pipe section 630 extends in the first direction to the fire extinguishing connector 720.

[0088] For example, the fire extinguishing connector 720 can be connected to the beam body 710 by means of welding, gluing, snap-fitting or fasteners.

[0089] For example, the surface of the heat exchange plate 510 furthest from the battery pack 310 is flush with the bottom surface of the crossbeam body 710. A splicing groove 711 is formed on the bottom surface of the crossbeam body 710. The fire extinguishing connector 720 is embedded in the splicing groove 711, and the bottom surface of the fire extinguishing connector 720 is flush with the bottom surface of the crossbeam body 710, thereby achieving a splicing connection between the fire extinguishing connector 720 and the crossbeam body 710. Furthermore, the splicing groove 711 can penetrate two opposite sides of the crossbeam body 710 along a first direction, and the two opposite sides of the fire extinguishing connector 720 along the first direction are aligned one-to-one with the two opposite sides of the crossbeam body 710 along the first direction.

[0090] For example, the inlet connector 520 and the outlet connector 530 pass through the crossbeam body 710 respectively.

[0091] In this embodiment, one of the first crossbeams 700 is designed as two independently connected parts, namely, the crossbeam body 710 and the fire extinguishing connector 720. The fire extinguishing channel 721 used for conveying the fire extinguishing medium can be set in the independent fire extinguishing connector 720. The channel used for conveying the fire extinguishing medium and the channel used for conveying the heat exchange medium can be isolated from each other to prevent mutual interference between the two.

[0092] Meanwhile, in the embodiment, the first pipeline section 630 can be sealed and connected to the fire extinguishing connector 720, and the crossbeam body 710 can be sealed and connected to the heat exchange plate 510. Then, the fire extinguishing connector 720 and the crossbeam body 710 can be spliced ​​together, and the first pipeline section 630 can be embedded in the mounting groove 512. This helps to reduce the assembly difficulty of the battery pack and improve the assembly efficiency.

[0093] like Figure 5 and Figure 6In some embodiments, the fire extinguishing channel 721 extends along a second direction, and at least two first pipe sections 630 are provided at intervals along the second direction, with at least two first pipe sections 630 respectively connected to the fire extinguishing channel 721; the second direction is the extension direction of the first crossbeam 700.

[0094] For example, the side of the fire extinguishing connector 720 near the heat exchange plate 510, except for the part connected to the first pipe section 630, can be used to block the opening of the heat exchange channel 511 at the end of the heat exchange plate 510.

[0095] For example, the number of second pipe segments 640 can be greater than the number of first pipe segments 630. In this case, the same first pipe segment 630 can be connected to at least two second pipe segments 640; or, the number of second pipe segments 640 can be less than the number of first pipe segments 630. In this case, at least two first pipe segments 630 can be connected to the same second pipe segment 640; or, the number of second pipe segments 640 can be equal to the number of first pipe segments 630. In this case, the first pipe segments 630 and the second pipe segments 640 are connected in a one-to-one correspondence.

[0096] Setting up multiple first pipe sections 630 can improve the efficiency of the fire extinguishing pipe 600 in delivering the fire extinguishing medium, which helps to extinguish and cool the battery pack 310 in a timely manner in the event of thermal runaway. At the same time, setting up multiple first pipe sections 630 can also reduce the risk of blockage and failure of the fire extinguishing pipe 600, which helps to improve the safety performance of the battery pack.

[0097] like Figure 4 and Figure 5 In some embodiments, the battery pack includes two first longitudinal beams 800 connected to the heat exchange plate 510. The two first longitudinal beams 800 are disposed on opposite sides of the heat exchange plate 510 along a second direction. The two first longitudinal beams 800 are connected by two first cross beams 700 to form a frame structure. A middle cross beam 900 is disposed on the plate surface of the heat exchange plate 510 near the cell assembly 310. The middle cross beam 900 is connected to the two first longitudinal beams 800. A second pipe section 640 passes through the middle cross beam 900 to communicate with the first pipe section 630.

[0098] For example, the first crossbeam 700 can be connected to the first longitudinal beam 800 by means of integral molding, welding, snap-fitting, gluing or fasteners.

[0099] For example, the intermediate crossbeam 900 can be connected to the first longitudinal beam 800 by means of integral molding, welding, snap-fitting, gluing or fasteners.

[0100] For example, the intermediate crossbeam 900 extends along the second direction.

[0101] The first longitudinal beam 800, the first crossbeam 700, and the intermediate crossbeam 900 not only improve the structural strength of the heat exchange plate 510, but also provide a structural foundation for fixing structural components (e.g., fixing the upper housing 100 or fixing the battery cell assembly 310). In this embodiment, the second pipe section 640 is designed to pass through the intermediate crossbeam 900, so that the setting position of the second pipe section 640 on the heat exchange plate 510 overlaps with the setting position of the intermediate crossbeam 900 on the heat exchange plate 510. This eliminates the need for the second pipe section 640 to occupy additional space on the heat exchange plate 510, which helps to further improve the energy density of the battery pack.

[0102] like Figure 4 In some embodiments, a middle plate 320 is connected to the side of the middle beam 900 away from the heat exchange plate 510, and multiple battery cell groups 310 are respectively arranged on opposite sides of the middle plate 320; a second pipeline section 640 passes through the middle plate 320.

[0103] For example, the middle plate 320 can be connected to the middle crossbeam 900 by means of welding, gluing, snap-fitting or fasteners.

[0104] Based on the foregoing, it can be understood that at least two cell groups 310 can form a structurally stable whole through the intermediate plate 320, and this whole can also be fixed in a predetermined position within the accommodating space 400 through the intermediate plate 320. In this embodiment, the second pipeline segment 640 is designed to pass through the intermediate plate 320, so that the setting position of part of the second pipeline segment 640 within the accommodating space 400 overlaps with the setting position of the intermediate plate 320 within the accommodating space 400, thereby reducing the additional space occupied by the second pipeline segment 640 within the accommodating space 400 and helping to further improve the energy density of the battery pack.

[0105] Meanwhile, the middle plate 320 can protect the second pipeline section 640 to prevent damage to the second pipeline section 640 during battery pack use and transportation.

[0106] like Figure 3 In some embodiments, the end of the second pipeline section 640 away from the heat exchange plate 510 extends out of the middle plate 320 and is connected to a nozzle 620; the nozzle 620 has a medium outlet 621 on at least two circumferential sidewalls that are arranged opposite each other along the first direction.

[0107] For example, the nozzle 620 can be connected to the second pipeline section 640 by means of integral molding, welding, gluing, snap-fitting or fasteners.

[0108] For example, the axis of the second pipeline section 640 is perpendicular to the surface of the heat exchange plate 510 near the cell assembly 310.

[0109] For example, the orthographic projection of the nozzle 620 onto the surface of the heat exchange plate 510 along the height direction of the battery pack can be a circle or a polygon.

[0110] For example, Figure 11 Showing Figure 8 A schematic diagram of the cross-section DD in the middle section. (See diagram below.) Figure 11 Multiple media outlets 621 can be provided on the circumferential wall side of the nozzle 620, and the media outlets 621 can be evenly distributed around the axis of the nozzle 620.

[0111] Combination Figure 3 It can be understood that battery cell groups 310 are provided on both sides of the middle plate 320 along the first direction, and the nozzle 620 has media outlets 621 on at least two circumferential sidewalls opposite each other along the first direction, so that at least one media outlet 621 of the nozzle 620 faces the setting direction of the battery cell group 310. When the battery pack experiences thermal runaway, the extinguishing medium can be sprayed simultaneously from the aforementioned media outlets 621 onto the battery cell groups 310 on both sides of the middle plate 320, which helps to improve the fire extinguishing and cooling efficiency and improve the safety of the battery pack.

[0112] Meanwhile, multiple media outlets 621 are provided in different directions on the nozzle 620, which can improve the diffusion efficiency of the extinguishing medium in the containment space 400, making it suitable for battery packs that are larger in size and have a large number of internal battery cell groups 310.

[0113] like Figure 2 and Figure 4 In some embodiments, multiple battery cell groups 310 are arranged side by side as at least two battery cell modules 300 arranged along a second direction, and each battery cell module 300 is configured with at least one nozzle 620.

[0114] In this embodiment, each cell module 300 is provided with at least one nozzle 620, and the medium outlet 621 on the nozzle 620 can simultaneously spray fire extinguishing medium onto the cell groups 310 located on opposite sides of the middle plate 320 in the corresponding cell module 300. That is, fire extinguishing medium can be sprayed onto all cell groups 310 in the battery pack at the same time to further improve the fire extinguishing and cooling efficiency of the battery pack and improve the safety of the battery pack.

[0115] like Figure 4 In some embodiments, the battery pack includes an upper housing 100, a heat exchange plate 510 and a frame structure connected around the heat exchange plate 510 to form a lower housing 200, the upper housing 100 and the lower housing 200 being connected and enclosing to define an accommodating space 400.

[0116] Based on the foregoing, the frame structure surrounding the heat exchange plate 510 includes a first crossbeam 700 and a first longitudinal beam 800.

[0117] For example, the upper housing 100 may include an annular flange arranged circumferentially, which is connected to the lower housing 200 (e.g., the frame structure of the lower housing 200) by means of adhesive, fasteners or welding.

[0118] In this embodiment, the heat exchange plate 510 is incorporated as part of the lower housing 200, which avoids encroaching on the layout space of the cell pack 310 by placing the heat exchange plate 510 within the housing space 400, thus helping to improve the energy density of the battery pack.

[0119] It should be noted that some embodiments of this application have been described above. Other embodiments are within the scope of the appended claims.

[0120] The various embodiments in this application are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0121] The description in this application is given for illustrative purposes and is not intended to be exhaustive or to limit the application to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical application of this application and to enable those skilled in the art to understand this application and design various embodiments with various modifications suitable for a particular purpose.

[0122] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of this application is limited to these examples; under the concept of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of the embodiments of this application as described above, which are not provided in detail for the sake of brevity.

[0123] Although this application has been described in conjunction with specific embodiments thereof, many substitutions, modifications and variations of these embodiments will be apparent to those skilled in the art from the foregoing description.

[0124] The embodiments of this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of this application. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the embodiments of this application should be included within the protection scope of this application.

Claims

1. A battery pack, characterized in that, include: The housing space is located inside the battery pack; Multiple battery cell packs are disposed within the accommodating space; A heat exchange assembly includes a heat exchange plate, one side of which faces the receiving space and is used for heat exchange with the battery cell assembly. The other side of the heat exchange plate is away from the receiving space and has a mounting groove. The fire extinguishing pipeline has one part located outside the receiving space and embedded in the mounting groove, and another part extending into the receiving space. The part of the fire extinguishing pipeline located in the receiving space has a medium outlet for spraying fire extinguishing medium.

2. The battery pack according to claim 1, characterized in that, The heat exchange plate has multiple parallel channels inside. A portion of the channels are configured as heat exchange channels for the flow of heat exchange medium, while the side wall of another portion of the channels away from the receiving space is open to form the mounting groove. The mounting groove is isolated from the heat exchange channels.

3. The battery pack according to claim 2, characterized in that, The fire extinguishing pipeline includes a medium inlet, a first pipeline section, and a second pipeline section; the first pipeline section is at least partially embedded in the mounting groove and communicates with the medium inlet located outside the accommodating space; The second pipeline section is at least partially located within the containment space and communicates with the medium outlet, and the second pipeline section passes through the heat exchange plate near the cell assembly to communicate with the first pipeline section.

4. The battery pack according to claim 3, characterized in that, Each of the cell packs includes a plurality of cells stacked along a first direction; the heat exchange channel extends to both ends of the heat exchange plate along the first direction; the battery pack includes two first crossbeams, which are connected one-to-one with both ends of the heat exchange plate along the first direction; the first crossbeams block the openings of the heat exchange channel located at the ends of the heat exchange plate. The heat exchange plate is provided with an inlet connector and an outlet connector on the side near the battery pack. The inlet connector and the outlet connector are respectively connected to the heat exchange channel and extend out of the accommodating space through the first crossbeam. The medium inlet is located on the side of the first crossbeam away from the heat exchange plate along the first direction and is connected to the first pipeline section through the first crossbeam.

5. The battery pack according to claim 4, characterized in that, At least part of the first crossbeam includes a crossbeam body and a fire extinguishing connector that are spliced ​​together. A fire extinguishing flow channel is formed in the fire extinguishing connector. The first pipeline section is connected to the fire extinguishing flow channel. A fire extinguishing input connector is formed on the side of the fire extinguishing connector away from the heat exchange plate along the first direction. One end of the fire extinguishing input connector is open and connected to the fire extinguishing flow channel. The other end is open and configured as the medium inlet.

6. The battery pack according to claim 5, characterized in that, The fire extinguishing flow channel extends along a second direction, and at least two first pipe sections are spaced apart along the second direction, with each of the at least two first pipe sections connected to the fire extinguishing flow channel; the second direction is the extension direction of the first crossbeam.

7. The battery pack according to claim 4, characterized in that, The battery pack includes two first longitudinal beams connected to the heat exchange plate. The two first longitudinal beams are disposed on opposite sides of the heat exchange plate along the second direction. The two first longitudinal beams are connected by two first cross beams to form a frame structure. A middle crossbeam is provided on the surface of the heat exchange plate near the battery cell assembly. The middle crossbeam is connected to two first longitudinal beams. The second pipeline section passes through the middle crossbeam to communicate with the first pipeline section.

8. The battery pack according to claim 7, characterized in that, A middle plate is connected to the side of the middle beam away from the heat exchange plate, and multiple battery cell groups are respectively arranged on opposite sides of the middle plate; the second pipeline section passes through the middle plate.

9. The battery pack according to claim 8, characterized in that, The second pipeline section has an opening at one end away from the heat exchange plate that extends out of the middle plate and is connected to a nozzle; the nozzle has a medium outlet on at least two circumferential sidewalls that are arranged opposite each other along the first direction.

10. The battery pack according to claim 7, characterized in that, The battery pack includes an upper housing, and the heat exchange plate and the frame structure connected around the heat exchange plate form a lower housing. The upper housing and the lower housing are connected and enclosed to define the accommodating space.

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