Battery pack

Abstract

The utility model provides a battery pack, which comprises: a box body, in which a cavity is formed; the plurality of cooling frames are positioned in the cavity; the multiple cooling frames extend in the first direction and are arranged in parallel in the second direction perpendicular to the first direction. A cooling flow channel extending in the first direction and a plurality of containing parts communicating with the cooling flow channel are arranged in each cooling frame, and each containing part penetrates through the top and the bottom of the corresponding cooling frame; a plurality of columnar single batteries, wherein each columnar single battery is correspondingly arranged in one accommodating part; according to the battery pack, the cooling frame is applied, and the cooling runner and the accommodating part which are communicated with each other are formed in the cooling frame, so that the heat exchange medium in the cooling runner can be in direct contact with the columnar single batteries, the heat exchange efficiency between the heat exchange medium and the cooling effect of the columnar single batteries is improved, and the working efficiency and the overall performance of the battery pack are favorably improved.

Description

Technical Field

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

[0002] Battery packs are common energy storage devices, primarily composed of cylindrical cells with high energy density, long lifespan, and high reliability. In related technologies, battery packs utilize a cold plate structure to dissipate the heat generated by the cells to the external environment, ensuring the pack's operating efficiency. Typically, thermally conductive adhesive is used to bond the cylindrical cells sequentially to opposite sides of the cold plate structure, utilizing the heat exchange medium flowing within the cold plate to dissipate the heat generated by the cells. However, the thermally conductive adhesive and the sidewalls of the cold plate structure can reduce the heat exchange efficiency between the heat exchange medium and the individual cells, leading to a decrease in the overall heat dissipation efficiency of the battery pack and affecting its overall performance. Utility Model Content

[0003] In view of the above, this application aims to provide a battery pack to solve some or all of the aforementioned technical problems.

[0004] For the purposes described above, this application provides a battery pack, comprising:

[0005] The box body has a cavity inside;

[0006] Multiple cooling frames are located within the cavity; the multiple cooling frames extend in a first direction and are arranged in parallel in a second direction perpendicular to the first direction; each cooling frame has a cooling channel extending in the first direction and multiple receiving portions communicating with the cooling channel, each receiving portion penetrating the top and bottom of the cooling frame;

[0007] Multiple cylindrical single cells are provided, each cylindrical single cell being disposed in a corresponding receiving portion, so that the heat exchange medium in the cooling channel directly contacts the circumferential side of the corresponding cylindrical single cell via each receiving portion.

[0008] As can be seen from the above, the battery pack provided in this application includes multiple cooling frames. By opening cooling channels and multiple receiving parts connected to the cooling channels within the cooling frames, the flowing heat exchange medium can directly contact the cylindrical single cell within the cooling channels and remove the heat generated by it, thereby improving the cooling effect of the heat exchange medium on the cylindrical single cell, enhancing the heat exchange efficiency between the heat exchange medium and the cylindrical single cell, and improving the working efficiency and overall performance of the battery pack. Attached Figure Description

[0009] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0010] Figure 1 This is a schematic diagram of the structure of the first type of battery pack in the embodiments of this application;

[0011] Figure 2 This is an exploded schematic diagram of the first type of battery pack in the embodiments of this application;

[0012] Figure 3 This is a schematic diagram of the cooling frame of the first type of battery pack in the embodiments of this application;

[0013] Figure 4 This is a partial cross-sectional view of the cooling frame of the first type of battery pack in the embodiments of this application;

[0014] Figure 5 This is a top view of the cooling frame of the first type of battery pack in the embodiments of this application;

[0015] Figure 6 This is a front view (partial cross-sectional view) of the cooling frame of the first type of battery pack in the embodiments of this application;

[0016] Figure 7 This is a schematic diagram of the cooling frame, columnar single cell, and second sealing layer of the first type of battery pack in this application embodiment;

[0017] Figure 8 This is a schematic diagram of the insulating layer and sealing gasket of the first type of battery pack in the embodiments of this application;

[0018] Figure 9 This is a schematic diagram of the structure of the second type of battery pack in the embodiments of this application;

[0019] Figure 10 This is a schematic diagram of the cooling frame of the second type of battery pack in the embodiments of this application;

[0020] Figure 11 This is a partial cross-sectional view of the cooling frame of the second type of battery pack in this embodiment of the application;

[0021] Figure 12 This is a top view of the cooling frame of the second type of battery pack in this embodiment of the application;

[0022] Figure 13 This is a front view of the cooling frame of the second type of battery pack in this embodiment of the application;

[0023] Figure 14This is a schematic diagram of the cooling frame, columnar single cell, and second sealing layer of the second type of battery pack in this embodiment of the application.

[0024] Figure 15 This is a schematic diagram of the first type of fin assembly in the embodiments of this application;

[0025] Figure 16 This is a schematic diagram showing the arrangement of individual fins in the first type of fin group in the embodiments of this application;

[0026] Figure 17 This is a schematic diagram of the second type of fin assembly in the embodiments of this application;

[0027] Figure 18 This is a schematic diagram of the arrangement of individual fins in the second type of fin group in this application embodiment;

[0028] Figure 19 This is a schematic diagram of the first type of fin monomer in the embodiments of this application;

[0029] Figure 20 This is a schematic diagram of the second type of fin monomer in the embodiments of this application;

[0030] Figure 21 This is a schematic diagram of the third type of fin monomer in the embodiments of this application.

[0031] Explanation of reference numerals in the attached figures:

[0032] 100. Box body; 101. Cavity;

[0033] 200. Cooling frame; 201. Cooling channel; 2011. Flow divider; 2012. Partition plate; 2013. Third through hole; 202. Receiving part;

[0034] 300, cylindrical single-cell battery;

[0035] 401, First sealing layer; 402, First adhesive layer; 403, First through hole; 404, Insulating layer; 405, Second adhesive layer; 406, Second sealing layer; 407, Second through hole; 408, Recess; 409, Sealing gasket;

[0036] 500, fin assembly; 501, fin unit;

[0037] 600. Filler;

[0038] 701, First pipeline; 702, Second pipeline. Detailed Implementation

[0039] 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.

[0040] 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 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 covers the element or object listed after the word and its 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.

[0041] Battery packs are typically composed of cylindrical cells or other cylindrical cells. Thermal management of battery packs is crucial for the stability and efficiency of battery operation. Currently, battery packs often use cold plate structures, such as serpentine cold plates, which are adapted to the cylindrical cells. The heat exchange medium flowing within the cold plate structure absorbs the heat generated by the cylindrical cells, and the absorbed heat is released to the external environment as the heat exchange medium flows out, thereby achieving heat dissipation of the battery pack.

[0042] However, while cold plate structures can improve the heat dissipation performance of battery packs, they also have significant drawbacks. For example, cold plate structures such as serpentine cold plates require high processing precision, making them difficult to manufacture and resulting in higher production costs. Furthermore, introducing cold plate structures into battery packs increases their overall weight, which is detrimental to improving energy density. Additionally, individual cells are typically bonded to opposite sides of the cold plate structure using thermally conductive adhesive. Due to the presence of this adhesive and the sidewalls of the cold plate structure, the cooling effect of the cold plate structure on the cylindrical individual cells is limited, reducing the heat exchange efficiency between the cells and affecting the overall heat dissipation performance and operational efficiency of the battery pack.

[0043] This application provides a battery pack, combined with Figures 1-6 as well as Figures 9-13 The content shown provides a detailed description of the battery pack.

[0044] A battery pack includes a housing 100, a plurality of cooling frames 200, and a plurality of cylindrical individual cells 300. The housing 100 has a cavity 101. The plurality of cooling frames 200 are located in the cavity 101, extend in a first direction, and are arranged in parallel in a second direction perpendicular to the first direction. Each cooling frame 200 has a cooling channel 201 extending in the first direction and a plurality of receiving portions 202 communicating with the cooling channel 201. Each receiving portion 202 penetrates the top and bottom of the cooling frame 200. Each of the plurality of cylindrical individual cells 300 is correspondingly disposed in a receiving portion 202, so that the heat exchange medium in the cooling channel 201 directly contacts the circumferential side of the corresponding cylindrical individual cell 300 through each receiving portion 202.

[0045] Specifically, Figure 1 This is a schematic diagram of the structure of the first type of battery pack in the embodiments of this application. Figure 2 This is an exploded schematic diagram of the first type of battery pack in the embodiments of this application. Figure 3 This is a partial cross-sectional view of the cooling frame 200 of the first type of battery pack in the embodiments of this application. Figure 4 This is a partial cross-sectional view of the cooling frame 200 of the first type of battery pack in the embodiments of this application. Figure 5 This is a front view of the cooling frame 200 of the first type of battery pack in this embodiment. Figure 6 This is a top view of the cooling frame 200 of the first type of battery pack in the embodiments of this application.

[0046] Specifically, Figure 9 This is a schematic diagram of the structure of the second type of battery pack in the embodiments of this application. Figure 10 This is a schematic diagram of the cooling frame 200 of the second type of battery pack in this application embodiment. Figure 11 This is a partial cross-sectional view of the cooling frame 200 of the second type of battery pack in this embodiment of the application. Figure 12 This is a top view of the cooling frame 200 of the second type of battery pack in this embodiment of the application. Figure 13 This is a front view of the cooling frame 200 of the second type of battery pack in this embodiment.

[0047] Specifically, such as Figure 1 , Figure 2 as well as Figure 9 As shown, the housing 100 has a cavity 101 inside, which can be used to accommodate multiple cooling frames 200, thereby effectively protecting the cooling frames 200 and the cylindrical single cell 300 located inside.

[0048] Specifically, such as Figures 1-6 as well as Figures 9-13As shown, multiple cooling frames 200 are provided, and the multiple cooling frames 200 are located in the cavity 101 of the housing 100. The multiple cooling frames 200 extend along a first direction and are arranged in parallel along a second direction. This allows the multiple cooling frames 200 to be arranged in an orderly manner in the cavity 101, thereby improving the space utilization rate of the cavity 101. The multiple cooling frames 200 have good independence from each other. When one cooling frame 200 fails, it will not interfere with the other cooling frames 200, so as to prevent the heat dissipation function of the battery pack from being paralyzed.

[0049] More specifically, each cooling frame 200 is provided with a cooling channel 201 extending in a first direction. When the heat exchange medium enters the interior of the cooling channel 201 from one end of the cooling frame 200, it can flow along the first direction and be distributed throughout the cooling channel 201 to exchange heat with the columnar single cell battery 300 installed on the cooling frame 200. For the cooling frame 200, each cooling frame 200 has multiple receiving portions 202 connected to the cooling channel 201 along the height direction of the housing 100. The multiple receiving portions 202 penetrate the top and bottom of the cooling frame 200, and each cylindrical single cell 300 is located in one receiving portion 202. Since the multiple receiving portions 202 are all connected to the cooling channel 201, the circumferential side of the cylindrical single cell 300 located in the receiving portion 202 is in direct contact with the heat exchange medium. When the heat exchange medium in the cooling channel 201 flows in the first direction, it can carry away the heat generated by the cylindrical single cell 300 during operation. At the same time, since the cylindrical single cell 300 is in direct contact with the heat exchange medium, heat can be directly transferred from the cylindrical single cell 300 to the heat exchange medium, improving the heat exchange efficiency between the heat exchange medium and the cylindrical single cell 300, improving the cooling effect of the heat exchange medium on the cylindrical single cell 300, and thus improving the working efficiency and overall performance of the battery pack.

[0050] Specifically, such as Figure 1 , Figure 2 as well as Figure 9 As shown, the battery pack includes multiple cylindrical individual cells 300, and each cylindrical individual cell 300 is disposed in a receiving part 202. It can store the input electrical energy during charging and release the stored electrical energy during power consumption to meet the corresponding energy storage and power supply requirements.

[0051] In addition, such as Figure 4 and Figure 11As shown, since the cooling channels 201 opened in the cooling frame 200 are connected to multiple receiving parts 202, the battery pack does not need to use additional cold plate structures such as serpentine cold plates, which reduces the precision requirements of the battery pack manufacturing process, and also reduces its manufacturing difficulty and cooling cost; in addition, omitting the cold plate structure can reduce the overall weight of the battery pack, which is conducive to improving the energy density of the battery and realizing the lightweight design of the battery pack.

[0052] Furthermore, for the housing 202, such as Figures 1-6 as well as Figures 9-13 As shown, to improve the secure mounting of the cylindrical single cell 300 within the receiving portion 202, the dimensions of the receiving portion 202 are adapted to the dimensions of the cylindrical single cell 300; for example, Figure 7 This is a schematic diagram of the cooling frame 200, the columnar single cell 300, and the second sealing layer 406 of the first type of battery pack in this application embodiment. Figure 14 This is a schematic diagram of the cooling frame 200, the columnar single cell 300, and the second sealing layer 406 of the second type of battery pack in this embodiment of the application. Figure 2 , Figure 7 as well as Figure 14 As shown, when the cylindrical cell 300 is a cylindrical cell, the receiving part 202 can be configured as a cylindrical hole adapted to the cylindrical cell, so that the cylindrical hole penetrates the cooling frame 200, ensuring that the cylindrical cell is tightly attached to the inner wall of the cylindrical hole, avoiding the formation of obvious gaps, and improving the firmness of the cylindrical cell in the cylindrical hole.

[0053] For example, the heat exchange medium can be a fluid medium with good insulation properties and excellent heat exchange effect, such as mineral oil or fluoride, which will not be elaborated further here.

[0054] For example, for multiple cooling frames 200, such as Figures 1-7 as well as Figures 9-14 As shown, since multiple cooling frames 200 extend in the first direction and are arranged in parallel in the second direction, the first direction can be defined as the X direction and the second direction as the Y direction. When the first direction and the second direction are perpendicular to each other, the multiple cooling frames 200 are arranged in sequence in the cavity 101 and have good precision, which will not be elaborated here.

[0055] In some embodiments, each cylindrical cell 300 is covered with an insulating film (not shown in the figure) on its circumferential side surface to isolate the cylindrical cell 300 from the cooling channel 201.

[0056] Specifically, by uniformly covering the circumferential side of each cylindrical cell 300 with an insulating film, comprehensive protection and electrical insulation of the circumferential side of the cylindrical cell 300 can be effectively achieved, thereby improving the safety and reliability of the battery pack.

[0057] In some embodiments, a first sealing layer 401 and a first adhesive layer 402 are provided on the top of the cooling frame 200, with the first sealing layer 401 located between the top of the cooling frame 200 and the first adhesive layer 402. For example... Figure 2 As shown, the first sealing layer 401 disposed on the top of the cooling frame 200 can seal the gap between the receiving part 202 and the columnar single cell 300, preventing the heat exchange medium in the cooling channel 201 from flowing out from the top of the cooling frame 200 through the receiving part 202, so as to prevent the heat exchange medium from leaking and affecting the normal use of the battery pack.

[0058] Specifically, such as Figure 2 As shown, the first sealing layer 401 is located between the top of the cooling frame 200 and the first adhesive layer 402. Both the first sealing layer 401 and the first adhesive layer 402 have first through holes 403 corresponding to the receiving portion 202. The orthographic projection of the first sealing layer 401 at the bottom of the cavity 101 is located within the orthographic projection of the first adhesive layer 402 at the bottom of the cavity 101. The first adhesive layer 402 can fully cover the first sealing layer 401 and fix the first sealing layer 401 to the top of the cooling frame 200 to further seal the periphery of the columnar single cell 300, thereby improving the sealing effect of the battery pack.

[0059] In some embodiments, an insulating layer 404, a second adhesive layer 405, and a second sealing layer 406 are sequentially disposed between the bottom of the cooling frame 200 and the bottom of the cavity 101, with the insulating layer 404 located between the bottom of the cooling frame 200 and the second adhesive layer 405.

[0060] Specifically, such as Figure 2 , Figure 7 as well as Figure 14 As shown, the second sealing layer 406 is disposed between the bottom of the cooling frame 200 and the second adhesive layer 405. The second sealing layer 406 can seal the space between the receiving part 202 and the columnar single cell 300, preventing the heat exchange medium in the cooling channel 201 from flowing out from the bottom of the cooling frame 200 through the receiving part 202, so as to prevent the heat exchange medium from leaking and affecting the normal use of the battery pack.

[0061] More specifically, such as Figure 2 , Figure 7 as well as Figure 14 As shown, both the second sealing layer 406 and the second adhesive layer 405 have second through holes 407 corresponding to the receiving portion 202. The orthographic projection of the second sealing layer 406 at the bottom of the cavity 101 is located within the orthographic projection of the second adhesive layer 405 at the bottom of the cavity 101. At this time, the second adhesive layer 405 can fully cover the second sealing layer 406 and fix the second sealing layer 406 to the bottom of the cooling frame 200 to further seal the periphery of the columnar single cell 300, thereby improving the sealing effect of the battery pack.

[0062] Specifically, Figure 8 This is a schematic diagram of the insulating layer 404 and the sealing gasket 409 of the first type of battery pack in the embodiments of this application.

[0063] Specifically, such as Figure 2 and Figure 8 As shown, an insulating layer 404 is also provided at the bottom of the cooling frame 200 in the battery pack. The insulating layer 404 is located between the bottom of the cavity 101 and the second adhesive layer 405. The insulating layer 404 can support the cooling frame 200 and the cylindrical single cell 300 located in the cooling frame 200, and can electrically insulate the bottom of the cylindrical single cell 300 to prevent short circuits caused by contact between the cylindrical single cell 300 and other conductors. More specifically, the insulating layer 404 has a recess 408 corresponding to the second through hole 407. A sealing gasket 409 is provided in the recess 408 to seal the bottom of the receiving part 202. The sealing gasket 409 further seals and electrically insulates the bottom of the cylindrical single cell 300. At the same time, the recess 408 corresponding to the second through hole 407 in the insulating layer 404 can reduce the installation difficulty of the sealing gasket 409 and help improve the accuracy of the positioning and installation between the sealing ring and the corresponding cylindrical single cell 300 during the battery pack assembly process.

[0064] It should be noted that, as Figure 2 As shown, for the cylindrical single cell 300, the end of the cylindrical single cell 300 is usually its electrode. Therefore, by opening a first through hole 403 corresponding to the receiving portion 202 on the first sealing layer 401 and the first adhesive layer 402, and opening a second through hole 407 corresponding to the receiving portion 202 on the second sealing layer 406 and the second adhesive layer 405, it is ensured that the cylindrical single cell 300 can extend to the top and bottom of the cooling frame 200 respectively after being installed in the receiving portion 202. At the same time, the electrodes of the cylindrical single cell 300 can be exposed relative to the cooling frame 200 so as to make electrical connection to the cylindrical single cell 300.

[0065] In some embodiments, such as Figure 4 As shown, a flow divider 2011 adapted to multiple cylindrical single-cell batteries 300 is provided in the cooling channel 201. The flow divider 2011 extends meanderingly in the first direction and can be used to divide the cooling channel 201. Specifically, when the heat exchange medium flows in the cooling channel 201, the flow divider 2011 extending meanderingly in the first direction can divide the heat exchange medium and improve the uniformity of the distribution of the heat exchange medium in the cooling channel 201.

[0066] Furthermore, the flow divider 2011 can be a serpentine plate structure, with the surface of the flow divider 2011 being wavy in the first direction. This not only allows the flow divider 2011 to be adapted to multiple cylindrical single cells 300, but also allows the flow divider 2011 to disturb the flowing heat exchange medium, thereby improving the cooling effect of the heat exchange medium.

[0067] More specifically, such as Figure 4 and Figure 11 As shown, multiple receiving portions 202 are adapted to the flow divider 2011 and are arranged in a staggered manner in the first direction. At this time, the arrangement of the receiving portions 202 can be adapted to the shape of the flow divider 2011. This is beneficial to increase the number of columnar receiving portions 202 in the cooling frame 200 and improve the overall capacity of the battery pack.

[0068] In some embodiments, the battery pack further includes a plurality of fin groups 500 arranged in a first direction, the plurality of fin groups 500 being located within a cooling channel 201; each fin group 500 may be connected to one of the cooling frame 200 and the shunt plate 2011 and is located between adjacent cylindrical single cells 300; each fin group 500 includes a plurality of finned cells 501 arranged in parallel in the height direction of the housing 100, each finned cell 501 being adapted to an adjacent cylindrical single cell 300.

[0069] Specifically, Figure 15 This is a three-dimensional schematic diagram of the first type of fin assembly 500 in the embodiments of this application. Figure 16 This is a schematic diagram showing the arrangement of the first type of fin monomer 501 in the embodiments of this application. Figure 17 This is a three-dimensional schematic diagram of the second type of fin assembly 500 in the embodiments of this application. Figure 18 This is a schematic diagram showing the arrangement of the second type of fin monomer 501 in the embodiments of this application. Figure 19 This is a schematic diagram of the first type of fin monomer 501 in the embodiments of this application. Figure 20 This is a schematic diagram of the second type of fin monomer 501 in the embodiments of this application. Figure 21 This is a schematic diagram of the third type of fin monomer 501 in the embodiments of this application.

[0070] Specifically, such as Figure 4 , Figure 11 as well as Figures 15-21As shown, the battery pack also includes multiple fin groups 500 extending along a first direction. These fin groups 500 are located within the cooling channel 201. The fin groups 500 can disturb the heat exchange medium flowing within the cooling channel 201, thereby improving the cooling performance of the heat exchange medium. Furthermore, the fin groups 500 are connected to either the cooling frame 200 or the flow divider 2011. Specifically, the surface of the flow divider 2011 and the inner wall of the cooling channel 201 provide mounting positions for the fin groups 500. The fin groups 500 are located between adjacent cylindrical individual cells 300, providing partial circumferential support to the cylindrical individual cells 300, improving the stability of the cylindrical individual cells 300 within the cooling frame 200. Simultaneously, they can utilize the internal space of the cooling channel 201, improving the rationality of the fin group 500 distribution within the cooling channel 201 and preventing the fin groups 500 from interfering with the assembly process of the cylindrical individual cells 300.

[0071] More specifically, such as Figures 15-21 As shown, each fin assembly 500 includes multiple finned cells 501 arranged in parallel along the height direction of the housing 100. By applying multiple finned cells 501 in the fin assembly 500, the disturbance effect on the heat transfer medium flowing in the cooling channel 201 can be increased, improving the cooling performance of the heat transfer medium, and thus enhancing the heat transfer efficiency between the heat transfer medium and the cylindrical cell 300. Since each finned cell 501 is adapted to an adjacent cylindrical cell 300, the multiple finned cells 501 provide better support for the corresponding cylindrical cell 300, ensuring the stability and robustness of the cylindrical cell 300 within the cooling frame 200.

[0072] For example, when multiple fin groups 500 are arranged in the cooling channel 201 along the first direction, and each fin group 500 has multiple parallel fin units 501 in the height direction of the housing 100, the heat exchange medium flowing in the cooling channel 201 is disturbed by the fin units 501. The fin units 501 can disrupt the stability of the heat exchange medium boundary and reduce the internal resistance of the heat exchange medium, so as to better absorb the heat emitted by the columnar cell 300, thereby significantly enhancing the heat transfer efficiency between the heat exchange medium and the columnar cell 300.

[0073] Furthermore, the disturbance effect of the fin unit 501 can promote a more uniform distribution of heat in the heat exchange medium, effectively avoiding local overheating of the cooling frame 200 caused by uneven heating of the heat exchange medium. At the same time, due to the disturbance effect of the fin unit 501, the accumulation of deposits in the heat exchange medium on the inner surface of the cooling channel 201 can be reduced, ensuring the smooth flow of the heat exchange medium in the cooling channel 201.

[0074] In some embodiments, each fin unit 501 is inclined in a first direction; such as Figure 15 As shown, since the heat exchange medium flows in the cooling channel 201 along the first direction, by setting each finned cell 501 at an angle in the first direction, the disturbance of the finned cell 501 on the heat exchange medium can be increased, thereby further improving the heat exchange efficiency between the heat exchange medium and the columnar cell 300, so as to improve the overall performance of the battery pack.

[0075] In some embodiments, each fin unit 501 is a straight plate-like structure or a curved plate-like structure.

[0076] For example, the fin unit 501 adopts a flat plate-like structure, such as Figures 15 to 19 As shown, this effectively enhances the disturbance effect of the finned unit 501 on the heat exchange medium within the cooling channel 201, thereby improving heat exchange efficiency. Simultaneously, due to the simple structure of the flat plate, the manufacturing process is relatively easy, and the manufacturing precision is relatively low, significantly reducing production costs. This helps to reduce the overall cost of battery pack manufacturing, achieving a dual improvement in battery pack performance and economic benefits.

[0077] For example, the fin unit 501 adopts a bent plate-like structure, such as Figure 20 As shown, this can further enhance the disturbance effect of the finned unit 501 on the heat exchange medium in the cooling channel 201, thereby improving the flow path and turbulence of the heat exchange medium, significantly improving the heat exchange performance of the heat exchange medium, effectively improving the heat dissipation efficiency of the battery pack, and further ensuring the stability and reliability of the battery pack operation.

[0078] In some embodiments, the fin unit 501 is a plate-like structure with multiple corrugations arranged in a first direction. Specifically, as shown below... Figure 2 As shown, by forming a finned unit 501 with a plate-like structure having multiple corrugations arranged sequentially in the first direction, the corrugations can disturb the heat exchange medium flowing inside the cooling channel 201, thereby achieving cooling performance of the heat exchange medium and improving the heat exchange efficiency between the heat exchange medium and the cylindrical battery.

[0079] In some embodiments, the multiple fin units 501 of adjacent fin groups 500 are symmetrically distributed or staggered in the height direction of the housing 100.

[0080] For example, such as Figure 15 and Figure 16 As shown, when each finned unit 501 is inclined in the first direction, by setting multiple finned units 501 of adjacent fin groups 500 to be symmetrically distributed in the height direction of the housing 100, the heat exchange medium flowing in the cooling channel 201 along the first direction can be forced to continuously change its flow direction, thereby enhancing the heat exchange performance of the heat exchange medium in the cooling channel 201 and improving the heat exchange efficiency between the heat exchange medium and the columnar single cell battery 300.

[0081] For example, such as Figure 17 and Figure 18 As shown, when each finned unit 501 is inclined in the first direction, the staggered finned units 501 will generate more turning and bifurcation points in the flow path of the heat exchange medium. This will not only force the heat exchange medium flowing in the cooling channel 201 along the first direction to continuously change its flow direction and promote the continuous mixing and splitting of heat exchange media at different temperature levels, but will also further increase the turbulence of the heat exchange medium, thereby improving the heat exchange efficiency between the heat exchange medium and the columnar single cell 300.

[0082] In some embodiments, the cooling frame 200 and the finned unit 501 are formed of an insulating material, and the cooling channel 201 is a cavity formed within the insulating material.

[0083] Specifically, the cooling frame 200 can serve as the supporting body for the cylindrical single cell 300. When the cooling frame 200 is formed using insulating material, it can provide a good working environment for multiple cylindrical single cells 300 and also provide electrical insulation between adjacent cylindrical single cells 300 to prevent short circuits in the battery pack, thereby improving the safety of the battery pack application process. In addition, the cooling channel 201 is located inside the cooling frame 200. Therefore, when the cooling frame 200 is made and formed using insulating material, a cavity can be opened inside the cooling frame 200, and at least one cooling channel 201 can be constructed through the opened cavity so that the cylindrical single cell 300 can be cooled by the heat exchange medium flowing into the cavity. The battery pack can have a good heat dissipation effect without the need to add a cold plate structure.

[0084] Furthermore, the cooling frame 200 can be made of rigid plastics such as ABS (acrylonitrile-butadiene-styrene copolymer), PA (polyamide, i.e., nylon), PE (polyethylene), PP (polypropylene), PS (polystyrene), PMMA (polymethyl methacrylate, i.e., plexiglass), PVC (polyvinyl chloride), polycarbonate, polyurethane, phenolic resin, and polystyrene. It can also be made of special engineering plastics such as polyimide, polyphenylene sulfide, and polysulfone, or non-metallic materials with insulating properties such as synthetic rubber. In addition to good insulation, the above materials also have excellent heat resistance and high strength. Therefore, the specific materials used to construct the cooling frame 200 can be selected according to different requirements such as the overall structure of the battery pack, mechanical properties, processing method, weight requirements, heat resistance index, and cost budget, which will not be elaborated here.

[0085] In some embodiments, the cavity 101 is filled with a filler 600 for preventing heat exchange between the housing 100 and the cooling frame 200. For example... Figure 2As shown, during the battery pack assembly process, by filling the cavity 101 of the housing 100 with filler 600, the gap between the inner wall of the cavity 101 and the cooling frame 200 can be effectively filled. This not only fixes the cooling frame 200 but also enhances the overall structural strength of the battery pack. Furthermore, filler 600 possesses excellent thermal insulation properties, preventing heat transfer to adjacent battery packs or other electrical equipment in the event of thermal runaway, effectively preventing heat diffusion and reducing potential safety risks and economic losses.

[0086] For example, the filler 600 may be made of a material such as expanded polyurethane foam, which has both good thermal insulation and electrical insulation properties, to fill the gap between the cavity 101 and the cooling frame 200. Specifically, when expanded polyurethane foam is used as the filler 600, it can not only achieve effective thermal barrier by wrapping the periphery of the cooling frame 200, but also enhance the overall structural strength of the battery pack. In addition, the filling process of expanded polyurethane foam is simple and inexpensive, which helps to reduce the cost input in the battery pack manufacturing process, thereby achieving an optimal balance between performance and economic benefits, which will not be elaborated further here.

[0087] In some embodiments, a first pipe 701 and a second pipe 702 are respectively provided on opposite sides of each cooling frame 200. The first pipe 701 and the second pipe 702 are respectively connected to opposite ends of the cooling channel 201, and both penetrate the side wall of the housing 100 and extend to the outside of the housing 100, so as to realize the installation and fixation of the first pipe 701 and the second pipe 702.

[0088] For example, such as Figures 1-7 As shown, when the two ends of the cooling channel 201 in the cooling frame 200 are connected to the first pipe 701 and the second pipe 702 respectively, the heat exchange medium can flow into the cooling channel 201 through the first pipe 701, so that the heat exchange medium flows in the cooling channel 201 along the first direction and directly contacts the columnar single cell 300 in the housing 202, so that the heat generated by the columnar single cell 300 is transferred to the heat exchange medium. As the heat exchange medium continues to flow, the heat-carrying heat exchange medium flows into the second pipe 702 through the other end of the cooling channel 201, so as to discharge the heat of the battery pack to the outside through the second pipe 702, so as to release the heat of the battery pack to the external environment.

[0089] In some embodiments, a partition plate 2012 is provided inside the cooling channel 201 along a first direction. The partition plate 2012 divides the cooling channel 201 into two interconnected sub-channels (not shown in the figure) in the height direction of the housing 100, and the flow directions of the heat exchange medium in the two sub-channels are opposite; for example Figure 5As shown, by providing a partition plate 2012 along the first direction in the cooling channel 201, the cooling channel 201 can be divided into two interconnected sub-channels, thereby extending the flow path of the cooling medium in the cooling frame 200 and improving the cooling performance of the cooling medium.

[0090] Furthermore, a first pipe 701 and a second pipe 702 are provided on one side of the cooling frame 200, with the first pipe 701 located below the second pipe 702; one of the two sub-cooling channels 201 is connected to the outlet end of the first pipe 701, and the other is connected to the inlet end of the second pipe 702. In this way, when the heat exchange medium flows into the two sub-channels in sequence through the first pipe 701, the heat exchange medium can fill the interior of the sub-channels, ensuring sufficient contact between the heat exchange medium and the cylindrical cell 300, thereby optimizing the heat dissipation effect of the heat exchange medium on the cylindrical cell 300.

[0091] For example, such as Figures 9-14 As shown, when the cooling channel 201 inside the cooling frame 200 is divided into two sub-channels by the partition plate 2012, one of the two sub-cooling channels 201 is connected to the outlet end of the first pipe 701, and the other is connected to the inlet end of the second pipe 702. At this time, the heat exchange medium can flow into the sub-channel located below the partition plate 2012 through the first pipe 701, and then flow into the sub-channel located above the partition plate 2012, so that the heat exchange medium can fully contact the columnar single cell 300 in the housing 202 in the two sub-channels respectively. At this time, the columnar single cell 300 can transfer the heat generated by it to the heat exchange medium. Subsequently, the heat exchange medium flows into the second pipe 702 through the outlet end of the sub-channel located above the partition plate 2012, and then discharges the heat exchange medium to the outside of the battery pack through the second pipe 702, so as to release the heat of the battery pack to the external environment.

[0092] Furthermore, the partition plate 2012 is provided with multiple third through holes 2013, and each third through hole 2013 corresponds to a columnar single cell 300, so that the columnar single cell 300 passes through the partition plate 2012. This can both position and fix the columnar single cell 300 and ensure the flow effect of the heat exchange medium in the sub-cooling channel.

[0093] It should be noted that some embodiments of this application have been described above. Other embodiments are within the scope of the appended claims.

[0094] 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.

[0095] 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.

[0096] 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 (including the claims) is limited to these examples; within the framework 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 the details for the sake of brevity.

[0097] 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.

[0098] The embodiments of this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. 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 box body has a cavity inside; Multiple cooling frames are located within the cavity; Multiple cooling frames extend in a first direction and are arranged in parallel in a second direction perpendicular to the first direction; each cooling frame has a cooling channel extending in the first direction and multiple receiving portions communicating with the cooling channel, each receiving portion penetrating the top and bottom of the cooling frame; Multiple cylindrical single cells are provided, each cylindrical single cell being disposed in a corresponding receiving portion, so that the heat exchange medium in the cooling channel directly contacts the circumferential side of the corresponding cylindrical single cell via each receiving portion.

2. The battery pack according to claim 1, characterized in that, The top of the cooling frame is provided with a first sealing layer and a first adhesive layer, with the first sealing layer located between the top of the cooling frame and the first adhesive layer. Both the first sealing layer and the first adhesive layer have a first through hole corresponding to the receiving portion, and the orthographic projection of the first sealing layer at the bottom of the cavity is located within the orthographic projection of the first adhesive layer at the bottom of the cavity.

3. The battery pack according to claim 1, characterized in that, An insulating layer, a second adhesive layer, and a second sealing layer are sequentially disposed between the bottom of the cooling frame and the bottom of the cavity, with the insulating layer located between the bottom of the cooling frame and the second adhesive layer; Both the second sealing layer and the second adhesive layer are provided with a second through hole corresponding to the receiving portion, and the orthographic projection of the second sealing layer at the bottom of the cavity is located within the orthographic projection of the second adhesive layer at the bottom of the cavity; The insulating layer has a recess corresponding to the second through hole, and a sealing gasket is provided in the recess to seal the bottom of the receiving part.

4. The battery pack according to claim 1, characterized in that, Each of the cylindrical cell's circumferential sides is covered with an insulating film to isolate the cylindrical cell from the cooling channel.

5. The battery pack according to claim 1, characterized in that, The cooling channel is provided with a flow divider adapted to the plurality of cylindrical single cells. The flow divider extends meanderingly in the first direction, and the plurality of receiving portions are staggered on opposite sides of the flow divider.

6. The battery pack according to claim 5, characterized in that, Also includes: Multiple fin groups arranged in the first direction are located within the cooling channel; each fin group is connected to one of the cooling frame and the flow divider, and is located between adjacent cylindrical single cells; Each fin group includes multiple finned cells arranged in parallel along the height direction of the housing, and each finned cell is adapted to the adjacent cylindrical cell.

7. The battery pack according to claim 6, characterized in that, Each of the fin units is inclined in the first direction; Each of the fin units is a straight plate-like structure or a curved plate-like structure.

8. The battery pack according to claim 6, characterized in that, The fin unit is a plate-like structure with multiple corrugations in the first direction.

9. The battery pack according to claim 6, characterized in that, The multiple fin units of adjacent fin groups are symmetrically distributed or staggered in the height direction of the housing.

10. The battery pack according to claim 9, characterized in that, The cooling frame and the fin unit are formed of insulating material, and the cooling channel is a cavity formed within the insulating material.

11. The battery pack according to claim 1, characterized in that, The cavity is filled with a filler material to prevent heat exchange between the housing and the cooling frame.

12. The battery pack according to claim 1, characterized in that, Each of the cooling frames is provided with a first pipe and a second pipe on opposite sides. The first pipe and the second pipe are respectively connected to opposite ends of the cooling channel, and both pipes penetrate the side wall of the housing and extend to the outside of the housing.

13. The battery pack according to claim 1, characterized in that, The cooling channel is provided with a partition plate extending in the first direction. The partition plate divides the cooling channel into two interconnected sub-channels in the height direction of the box body, and the heat exchange medium in the two sub-channels flows in opposite directions. The cooling frame is provided with a first pipe and a second pipe on one side, with the first pipe located below the second pipe; one of the two sub-cooling channels is connected to the outlet end of the first pipe, and the other is connected to the inlet end of the second pipe.

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