Cylindrical battery pack and vehicle

Abstract

The utility model provides a kind of cylindrical battery package and vehicle, it is related to vehicle parts technical field.The cylindrical battery package includes bottom plate and multiple cylindrical electric core;Supporting surface of bottom plate is provided with multiple exhaust holes, the inside of bottom plate is provided with exhaust passage, exhaust passage and each exhaust hole are all communicated;The edge of one exhaust hole is covered by the bottom end cover of each cylindrical electric core, and there is foam arranged around exhaust hole circumferentially between bottom end cover and bottom plate to form sealing structure;First explosion-proof valve is provided in the area of the bottom end cover of cylindrical electric core opposite exhaust hole, first explosion-proof valve, exhaust hole and exhaust passage are used to constitute the pressure relief path of cylindrical electric core.By setting foam to seal in the bottom of cylindrical electric core, structural adhesive coating, heating and standing curing process are saved, production rhythm is greatly shortened, and without special heating equipment, equipment investment cost and production energy consumption are reduced.

Description

Technical Field

[0001] This utility model relates to the field of vehicle parts technology, and more specifically, to a cylindrical battery pack and a vehicle. Background Technology

[0002] The structural features of a large cylindrical battery are: a positive electrode is located on the top cover, an explosion-proof valve is integrated into the bottom cover, and the casing serves as the negative electrode. In mass production, the low-viscosity polyurethane foam used in the cell gap sealing process of the large cylindrical battery pack is prone to penetrating to the bottom of the cell under the influence of gravity and surface tension, causing physical blockage of the pressure relief channel of the explosion-proof valve.

[0003] In related technologies, an epoxy structural adhesive is applied to the contact end between the battery cell and the base plate to prevent the foam adhesive from penetrating into the explosion-proof valve area. This process requires heating and static curing of the adhesive, resulting in a long module production cycle. It also requires specialized heating equipment, leading to high production costs and high energy consumption. Utility Model Content

[0004] The problem this invention addresses is how to shorten the production cycle of large cylindrical battery packs and reduce production costs and energy consumption.

[0005] To solve the above problems, this utility model provides a cylindrical battery pack and a vehicle.

[0006] In a first aspect, this utility model provides a cylindrical battery pack, including a base plate and a plurality of cylindrical battery cells; The supporting surface of the base plate is provided with multiple vent holes, and the interior of the base plate is provided with vent channels, which are connected to each of the vent holes. The bottom end cap of each cylindrical cell is fitted to cover the edge of one of the vent holes, and foam arranged circumferentially around the vent hole is provided between the bottom end cap and the base plate to form a sealing structure. A first explosion-proof valve is provided in the area of ​​the bottom end cover of the cylindrical battery cell facing the vent hole. The first explosion-proof valve, the vent hole, and the vent channel are used to form the pressure relief path of the cylindrical battery cell.

[0007] Optionally, the foam between each of the bottom end caps and the base plate forms a closed-loop foam gasket; The inner ring diameter of the foam gasket is larger than the diameter of the vent hole, and / or the outer ring diameter of the foam gasket is smaller than the diameter of the bottom cap, and / or the foam gasket is bonded to the corresponding bottom cap.

[0008] Optionally, the cylindrical cells are arranged in multiple rows, with each row containing several cylindrical cells, and the foam between the bottom end cap of each row of cylindrical cells and the base plate extends and connects to form an integral foam pad.

[0009] Optionally, it also includes a housing frame, the bottom plate including a first plate and a second plate arranged in parallel, the first plate having the exhaust holes, all of which penetrate the first plate; a periphery of the first plate and the second plate are fixed to the housing frame, and the space enclosed by the first plate, the second plate and the housing frame constitutes the exhaust channel.

[0010] Optionally, it also includes a casing cover plate, the casing cover plate, the casing frame, and the bottom plate forming a sealed casing for the cylindrical battery pack; The first plate is also provided with an air guide hole, which penetrates the first plate and is used to connect the exhaust channel with the space inside the sealing shell; A second explosion-proof valve is provided on the enclosure frame, and the second explosion-proof valve is located on the part of the enclosure frame used to enclose the internal space of the sealed housing.

[0011] Optionally, the enclosure frame is formed by connecting four first side frames end to end to form a rectangular frame; the first side frames are formed by extrusion of aluminum alloy profiles and have a multi-chamber structure in cross-section; And / or, the inner side of the enclosure frame is provided with an annular overlapping plate, which is used to overlap with a periphery of the first plate; the bottom surface of the enclosure frame is sealed to a periphery of the second plate.

[0012] Optionally, the cylindrical battery pack includes multiple module units, each module unit including multiple cylindrical cells, a module frame and a module cover; the bottom open end of the module frame is fixedly connected to the base plate, the top open end is fixedly connected to the module cover, and the multiple cylindrical cells are disposed within the module frame and the cylindrical cells are filled with expanding foam.

[0013] Optionally, a first foam plug is provided between the module frame and the base plate to achieve a seal between the module frame and the base plate; the first foam plug has a U-shaped cross-section and wraps around the bottom edge of the module frame.

[0014] Optionally, the cylindrical cells are arranged in multiple rows within the module frame. Each row of cylindrical cells has a corrugated liquid cooling plate on both sides. Two adjacent rows of cylindrical cells share one corrugated liquid cooling plate. The two ends of the corrugated liquid cooling plate pass through a pre-set opening in the module frame and extend to the outside of the module frame. Each opening has multiple second foam plugs at its edge to achieve a seal between the circumferential edge of the opening and the corrugated liquid cooling plate.

[0015] Secondly, this utility model provides a vehicle including the aforementioned cylindrical battery pack.

[0016] The beneficial effects of this cylindrical battery pack are: The vent holes on the base plate are connected to the internal integrated venting channel, forming a directional pressure relief path from inside the cylindrical cell to outside the cylindrical battery pack, in conjunction with the first explosion-proof valve. When the pressure inside the cylindrical cell rises abnormally due to thermal runaway, overcharging, or mechanical abuse, the first explosion-proof valve releases the internal pressure of the cell through a pre-set groove or ruptured membrane structure to prevent an explosion. The released high-temperature gas is then directionally discharged to outside the battery pack or to a pre-set safe area through the venting channel.

[0017] Each vent is covered by the bottom cap of a cylindrical battery cell, and the gap between the two is sealed by foam arranged circumferentially around the vent to prevent the foam filling between the cylindrical battery cells from flowing into the first explosion-proof valve area during assembly, thus ensuring the unobstructed pressure relief path of the first explosion-proof valve-vent-vent passage.

[0018] Compared to existing techniques that seal cylindrical battery cells by applying structural adhesive to the bottom, this invention utilizes a foam sealing structure, offering three major advantages: ① Simplified process: The foam seals the cells by compressing them against the base plate, eliminating the need for adhesive application and heating / curing, significantly shortening production time; ② Cost optimization: No dedicated heating equipment is required, reducing equipment investment costs and energy consumption; ③ Enhanced safety and stability: The compression and rebound properties of the foam compensate for cell height tolerances, ensuring reliable sealing during long-term use. It should be noted that the cylindrical battery pack in the attached diagram has two module units arranged side-by-side. Attached Figure Description

[0019] Figure 1 This is a schematic diagram showing the disassembled structure of the casing cover of the cylindrical battery pack according to an embodiment of the present invention.

[0020] Figure 2 This is a schematic diagram showing the disassembled structure of the cylindrical battery pack using foam gaskets, as described in an embodiment of this utility model.

[0021] Figure 3 This is a schematic diagram showing the disassembled structure of the cylindrical battery pack using foam pads, as described in an embodiment of this utility model.

[0022] Figure 4 for Figure 3 Enlarged view of part A in the image.

[0023] Figure 5 This is a schematic diagram of the modular unit disassembly structure of the cylindrical battery pack according to an embodiment of the present invention.

[0024] Figure 6This is a schematic diagram of the structure of the first foam plug strip of the cylindrical battery pack according to an embodiment of the present invention.

[0025] Figure 7 This is a schematic diagram of the cylindrical cell structure of the cylindrical battery pack according to an embodiment of the present invention.

[0026] Explanation of reference numerals in the attached figures: 1. Base plate; 101. First plate; 102. Second plate; 11. Vent hole; 12. Vent channel; 13. Air guide hole; 2. Cylindrical battery cell; 21. Bottom end cover; 22. First explosion-proof valve; 31. Foam gasket; 32. Foam strip; 4. Enclosure frame; 41. Overlap plate; 51. Module enclosure frame; 511. Opening; 52. Module cover plate; 53. First foam plug; 54. Corrugated liquid cooling plate; 55. Second foam plug; 6. Second explosion-proof valve; 7. Enclosure cover plate. Detailed Implementation

[0027] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Although some embodiments of this utility model are shown in the drawings, it should be understood that this utility model can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this utility model. It should be understood that the drawings and embodiments of this utility model are for illustrative purposes only and are not intended to limit the scope of protection of this utility model.

[0028] The term "comprising" and its variations as used herein are open-ended, meaning "including but not limited to"; the term "based on" means "at least partially based on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; and the term "optionally" means "optional embodiments". Definitions of other terms will be given in the following description. It should be noted that the concepts of "first," "second," etc., mentioned in this utility model are only used to distinguish different devices, modules, or units, and are not used to limit the order of functions performed by these devices, modules, or units or their interdependencies.

[0029] It should be noted that the terms "one" and "multiple" used in this utility model are illustrative rather than restrictive. Those skilled in the art should understand that, unless explicitly stated otherwise in the context, they should be understood as "one or more". "Several" refers to one or more "one or more".

[0030] like Figure 1-3 and Figure 7As shown, this embodiment of the utility model provides a cylindrical battery pack, including a base plate 1 and a plurality of cylindrical cells 2; the supporting surface of the base plate 1 is provided with a plurality of vent holes 11, and the interior of the base plate 1 is provided with a vent channel 12, which is connected to each vent hole 11; the bottom end cap 21 of each cylindrical cell 2 is fitted to cover the edge of a vent hole 11, and foam arranged circumferentially around the vent hole 11 is provided between the bottom end cap 21 and the base plate 1 to form a sealing structure; a first explosion-proof valve 22 is provided in the area of ​​the bottom end cap 21 of the cylindrical cell 2 facing the vent hole 11, and the first explosion-proof valve 22, the vent hole 11 and the vent channel 12 are used to form the pressure relief path of the cylindrical cell 2.

[0031] In this embodiment, the vent 11 on the base plate 1 is connected to the internal integrated vent channel 12, forming a directional pressure relief path from the inside of the cylindrical cell 2 to the outside of the cylindrical battery pack, in conjunction with the first explosion-proof valve 22. When the pressure inside the cylindrical cell 2 abnormally increases due to thermal runaway, overcharging, or mechanical abuse, the first explosion-proof valve 22 ruptures through a preset notch or membrane structure to release the internal pressure of the cell and prevent an explosion. The released high-temperature gas is directionally discharged to the outside of the battery pack or a preset safe area through the vent channel 12.

[0032] Each vent 11 is fitted and covered by the bottom end cap 21 of a cylindrical cell 2, and the gap between the two is sealed by foam arranged circumferentially around the vent 11 to prevent the foam filling between the cylindrical cells 2 from flowing to the area of ​​the first explosion-proof valve 22 during assembly, thus ensuring the unobstructed pressure relief path of the first explosion-proof valve 22-vent vent 11-vent passage 12.

[0033] Compared to related technologies that seal the bottom of the cylindrical battery cell 2 by applying structural adhesive, this utility model adopts a foam sealing structure, which has three major advantages: ① Simplified process: The foam can achieve sealing by pressing the battery cell itself against the base plate 1, eliminating the need for structural adhesive application and heating and static curing processes, greatly shortening the production cycle; ② Cost optimization: No special heating equipment is required, reducing equipment investment costs and production energy consumption; ③ Enhanced safety and stability: The compression and rebound characteristics of the foam can compensate for the height tolerance of the battery cell, ensuring sealing reliability during long-term use.

[0034] Optionally, such as Figure 2 As shown, the foam between each bottom cover 21 and the bottom plate 1 forms a closed ring foam gasket 31, and the inner ring diameter of the foam gasket 31 is larger than the diameter of the vent hole 11.

[0035] In this optional embodiment, the foam gasket 31 can be annular, fitting into the annular gap between the bottom cover 21 and the base plate 1. The inner ring diameter of the annular foam gasket 31 is designed to be larger than the diameter of the vent hole 11, ensuring that after the foam gasket 31 is deformed under assembly pressure, the amount of deformation into the vent hole 11 is minimal, having almost no impact on the pressure relief path and guaranteeing smooth pressure relief. Specifically, the inner ring diameter D1 of the foam gasket 31 can be designed to satisfy the following condition: D1 ≥ D2 + 0.5 mm, meaning that the inner ring diameter D1 has a margin of at least 0.25 mm on each side of the vent hole 11, so that the foam gasket 31 will not obstruct the vent hole 11 even after deformation under pressure.

[0036] In addition, the outer ring diameter of the foam gasket 31 can be smaller than the diameter of the bottom cover 21. Specifically, the outer ring diameter D3 of the foam gasket 31 and the diameter D4 of the bottom cover 21 can be designed to satisfy D3≤D4-1.0mm, that is, the outer ring diameter D3 is recessed by about 0.5mm on one side of the bottom cover 21, and the entire foam gasket 31 is completely located within the gap between the corresponding bottom cover 21 and the base plate 1, so that it is not easy to protrude from the gap even after being deformed by pressure.

[0037] It should be noted that the foam gasket 31 can also be in other shapes, such as square or trapezoidal, as long as there is a corresponding hole in the center.

[0038] Optionally, the foam gasket 31 is bonded to the corresponding bottom cap 21.

[0039] The foam gaskets 31 are ring-shaped, small in size and numerous. In this optional embodiment, when the battery pack is assembled, the foam gaskets 31 can be pre-attached to the bottom cover 21 for easy operation. Then, the cylindrical battery cells 2 with the attached foam gaskets 31 can be directly placed on the base plate 1 for grouping and assembly, which helps to improve assembly efficiency.

[0040] Optionally, such as Figure 3 As shown, the cylindrical cells 2 are arranged in multiple rows, each row containing several cylindrical cells 2. The foam between the bottom end cap 21 of each row of cylindrical cells 2 and the base plate 1 extends and connects to form an integral foam pad 32.

[0041] In this optional embodiment, the cells of the cylindrical battery pack adopt a vertical arrangement structure. The axis of the cylindrical cells 2 is perpendicular to the support surface of the base plate 1, and they are distributed in multiple rows on the support surface of the base plate 1. Each row of cylindrical cells 2 is provided with a foam pad 32, covering the installation area of ​​all cylindrical cells 2 in a single row, simplifying the foam structure, reducing the number of parts, and improving assembly efficiency. Specifically, the foam pad 32 can be rectangular strips for easy installation and positioning.

[0042] Alternatively, the foam pad 32 may be bonded to the support surface of the base plate 1.

[0043] In this optional embodiment, during assembly, the foam pad 32 can be directly glued to the base plate 1, which is convenient to operate. Then, the cylindrical battery cell 2 is placed on top of it, and a foam pad 31 is glued to each cylindrical battery cell 2. This embodiment can improve assembly efficiency.

[0044] Optionally, the vent holes 11 are distributed in multiple rows on the supporting surface of the base plate 1, with each row containing several vent holes 11.

[0045] In this optional embodiment, the vent holes 11 are arranged in a one-to-one correspondence with the cylindrical cells 2, and thus are also distributed in multiple rows on the support surface of the base plate 1, with each row containing several vent holes 11 to form a high-density flow guiding mesh.

[0046] In addition, the cylindrical cells 2 in each row are usually spaced apart, and the adjacent rows of cylindrical cells 2 are arranged in an alternating manner to improve space utilization. Therefore, the exhaust holes 11 in the adjacent rows are also arranged in an alternating manner.

[0047] Optionally, such as Figure 1-4 As shown, the cylindrical battery pack also includes a casing frame 4. The bottom plate 1 includes a first plate 101 and a second plate 102 arranged in parallel. The first plate 101 is provided with an exhaust hole 11, which penetrates the first plate 101. One periphery of the first plate 101 and the second plate 102 are fixed to the casing frame 4. The space enclosed by the first plate 101, the second plate 102 and the casing frame 4 constitutes an exhaust channel 12.

[0048] In this optional embodiment, the base plate 1 adopts a double-layer hollow sandwich structure composed of a first plate 101 and a second plate 102, with multiple exhaust holes 11 opened on the first plate 101. The enclosure frame 4 seals and fixes the first plate 101 and the second plate 102 along the circumferential edge of the base plate 1, so that the sandwich space between the double-layer plates naturally forms a closed exhaust channel 12. This integrated structural design directly constructs the flow path through the enclosure frame 4, the width of the sandwich exhaust channel 12 is uniform, the gas flow path is smooth, and the pressure relief efficiency is significantly improved.

[0049] In addition, a support structure, such as a support column or support bar, can be provided between the first plate 101 and the second plate 102. The upper and lower ends of the support structure are fixedly connected to the first plate 101 and the second plate 102 respectively, in order to enhance the deformation resistance of the double-layer plate structure and enable the base plate 1 to withstand sufficient vertical load.

[0050] Optionally, such as Figure 1-3As shown, the cylindrical battery pack also includes a casing cover plate 7, the casing cover plate 7, the casing frame 4, and the bottom plate 1, which constitute the sealed casing of the cylindrical battery pack; the first plate 101 is also provided with a vent hole 13, which penetrates the first plate 101 and is used to connect the exhaust channel 12 with the space inside the sealed casing; the casing frame 4 is provided with a second explosion-proof valve 6, which is located at the part of the casing frame 4 that is used to enclose the space inside the sealed casing.

[0051] In this optional embodiment, the casing cover 7, casing frame 4, and bottom plate 1 together constitute the battery pack sealing casing. The first plate 101 is provided with a vent 13, establishing an exhaust channel 12 that communicates with the gas inside the sealing casing. The second explosion-proof valve 6 is embedded in the casing frame 4 and is configured to automatically open when the pressure inside the sealing casing reaches a preset threshold, establishing a gas communication path between the inner cavity of the sealing casing and the outside of the cylindrical battery pack. When thermal runaway of the battery cell triggers the opening of the first explosion-proof valve 22, the gas inside the cylindrical battery cell 2 flows into the exhaust channel 12 through the first explosion-proof valve 22 and the vent 11, and then flows into the internal space of the sealing casing through the vent 13. When the pressure in the exhaust channel 12 and the sealing casing rises to the preset threshold, the second explosion-proof valve 6 automatically opens, and the gas inside the sealing casing flows to the outside of the cylindrical battery pack through the second explosion-proof valve 6, forming a directional pressure relief path, realizing the directional discharge of thermal runaway gas to the outside of the battery pack through the exhaust channel 12.

[0052] It is understandable that the interior of the sealed housing is used to accommodate the cylindrical battery cell 2, and its height is relatively large, while the exhaust channel 12 is used for airflow guidance, and its height is relatively small. Therefore, the size of the part of the housing frame 4 that encloses the interior space of the sealed housing is larger than the size of the part that encloses the exhaust channel 12. Thus, placing the second explosion-proof valve 6 on the part of the housing frame 4 that encloses the interior space of the sealed housing can facilitate the processing of the second explosion-proof valve 6 and ensure the size requirements of the second explosion-proof valve 6.

[0053] Optionally, the enclosure frame 4 is provided with a through hole corresponding to the second explosion-proof valve 6. This through hole communicates with the internal space of the sealed housing formed by the enclosure cover plate 7, the enclosure frame 4, and the bottom plate 1. The second explosion-proof valve 6 is disposed in this through hole. Multiple second explosion-proof valves 6 may be provided.

[0054] Optionally, the enclosure frame 4 is a rectangular frame formed by connecting four first side frames end to end; the first side frames are formed by extrusion of aluminum alloy profiles and have a multi-chamber structure in cross-section.

[0055] In this optional embodiment, the enclosure frame 4 adopts a rectangular frame structure, consisting of four first side frames connected end to end. The first side frames are formed by extrusion of aluminum alloy profiles, and their cross-section is designed as a multi-chamber structure. The interior is divided into multiple chambers by stiffening plates, which significantly improves bending stiffness and impact resistance while ensuring lightweight. High-strength connections are achieved between the first side frames and between the side frames and the base plate 1 through welding to ensure structural integrity. The assembly surfaces of the enclosure frame 4 and the enclosure cover plate 7 are reserved with flatness tolerances, and the final assembly is completed by mechanical fasteners.

[0056] Optionally, an annular overlapping plate 41 is provided on the inner side of the enclosure frame 4, which is used to overlap with a periphery of the first plate 101; the bottom surface of the enclosure frame 4 is sealed to a periphery of the second plate 102.

[0057] In this optional embodiment, an annular overlapping plate 41 is provided on the inner side of the enclosure frame 4. This structure forms a welded connection with the circumferential edge of the first plate 101, thereby enhancing the reliability of the structural connection by increasing the welding contact surface. The overlapping plate 41 can be designed as a right-angled trapezoidal structure, with the base of the trapezoid attached to and fixed to the inner side of the enclosure frame 4, and the right-angled side of the trapezoid horizontal and attached to and fixedly connected to the first plate 101. The first frame cross-section is designed as a rectangular cavity structure, with its bottom plane forming a surface contact connection with the second plate 102, and its top plane achieving a rigid connection with the enclosure cover 7, ensuring the assembly strength of the enclosure frame, the double-layer bottom plate, and the cover plate.

[0058] Optionally, such as Figure 1-3 and Figure 5 As shown, the cylindrical battery pack includes multiple module units, each module unit including multiple cylindrical cells 2, a module frame 51 and a module cover plate 52; the bottom open end of the module frame 51 is fixedly connected to the base plate 1, and the top open end is fixedly connected to the module cover plate 52. Multiple cylindrical cells 2 are arranged inside the module frame 51 and the cylindrical cells 2 are filled with expanding foam.

[0059] In this optional embodiment, the cylindrical battery cell 2 adopts a modular integrated design, divided into multiple independent module units. Each module unit consists of a module frame 51, a module cover plate 52, and a base plate 1 forming a sealed cavity, within which the cylindrical battery cell 2 is housed. The bottom open end of the module frame 51 can be rigidly connected to the base plate 1 via laser welding or structural adhesive bonding, or it can be connected by bolts. The top open end is sealed to the module cover plate 52 via a sealing ring press or laser welding to achieve dustproof sealing. The module cavity is filled with low-density foam to achieve radial constraint and axial buffering of the cylindrical battery cell 2. In addition, the module cover plate 52 has through holes to observe the foaming process of the foam.

[0060] Specifically, the module frame 51 is a rectangular frame formed by connecting four second borders end to end, and the cross-section of each second border is rectangular.

[0061] Optionally, a first foam plug 53 is provided between the module frame 51 and the base plate 1 to achieve a seal between the module frame 51 and the base plate 1.

[0062] In this optional embodiment, the first foam plug 53 is made of foam material to achieve efficient sealing of the bottom edge of the module frame 51 (i.e. the bottom edge of the second frame), effectively blocking the intrusion of coolant and environmental media, and also compensating for assembly gaps through elastic preload, thereby improving the structural vibration resistance.

[0063] It should be noted that, in this optional embodiment, the module frame 51 can be stably fixed to the base plate 1 by means of bolts and internal foam adhesive. Bolt feet can be provided on the module frame 51 for bolt connection to the base plate 1.

[0064] Optionally, such as Figure 5 and Figure 6 As shown, the first foam plug 53 has a U-shaped cross-section and wraps around the bottom edge of the module frame 51.

[0065] In this optional embodiment, the first foam plug 53 has a U-shaped cross-section and wraps around the bottom edge of the second frame on three sides, further improving the sealing reliability.

[0066] Optionally, the first foam plug 53 is bonded to the bottom edge of the corresponding module frame 51.

[0067] Optionally, such as Figure 1-3 and Figure 5 As shown, the cylindrical cells 2 are arranged in multiple rows within the module frame 51. Each row of cylindrical cells 2 has a corrugated liquid cooling plate 54 on both sides. Two adjacent rows of cylindrical cells 2 share a corrugated liquid cooling plate 54. The two ends of the corrugated liquid cooling plate 54 pass through the pre-set openings 511 in the module frame 51 and extend to the outside of the module frame 51. Each opening 511 has multiple second foam plugs 55 at its edge to achieve a seal between the circumferential edge of the opening 511 and the corrugated liquid cooling plate 54.

[0068] In this optional embodiment, the cylindrical cells 2 are arranged in multiple rows within the module frame 51. Each row of cylindrical cells 2 has a wave-shaped liquid cooling plate 54 on both sides of its axial direction. Adjacent rows of cylindrical cells 2 share the same wave-shaped liquid cooling plate 54 to form a double-sided cooling structure. The wave-shaped liquid cooling plate 54 is a long strip-shaped structure and is wavy along its extension direction to accommodate the staggered arrangement of adjacent rows of cylindrical cells 2. The wave-shaped liquid cooling plate 54 has a flow channel structure inside, with straight plate-shaped liquid inlet and liquid outlet ends at both ends. The two ends pass through the pre-set rectangular openings 511 of the second frame of the module frame 51 and extend to the outside. Each rectangular opening 511 has multiple second foam plugs 55 embedded circumferentially at intervals along its edge, forming an elastic interference fit with the wave-shaped liquid cooling plate 54 to achieve a dustproof and waterproof seal between the circumferential edge of the opening 511 and the end of the wave-shaped liquid cooling plate 54.

[0069] Optionally, the second foam plug 55 has a U-shaped cross-section and wraps around the edge of the opening 511, that is, it wraps around the wall of the opening 511 on three sides, further improving the sealing reliability. The side of the cylindrical cell 2 can be bonded and fixed to the corrugated liquid cooling plate 54.

[0070] Optionally, the opening 511 is a rectangular hole, the second foam plug 55 is straight, and a second foam plug 55 is nested on each of the four sides of the opening 511.

[0071] In this optional embodiment, the opening 511 is a rectangular hole, and a straight second foam plug strip 55 is embedded on each of its four edges. The second foam plug strip 55 has a U-shaped cross-section and covers the edge of the opening 511 by wrapping it on three sides. The bottom edge of the U-shape forms an elastic interference fit with the corrugated liquid cooling plate 54 to achieve a seal.

[0072] This utility model provides a vehicle including the aforementioned cylindrical battery pack. The technical improvements and technical effects of the vehicle are the same as those of the cylindrical battery pack.

[0073] Although the present invention has been disclosed above, its protection scope is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the protection scope of the present invention.

Claims

1. A cylindrical battery pack, characterized in that, Includes a base plate (1) and multiple cylindrical cells (2); The supporting surface of the base plate (1) is provided with a plurality of exhaust holes (11), and the interior of the base plate (1) is provided with an exhaust channel (12), which is connected to each of the exhaust holes (11); The bottom end cap (21) of each of the cylindrical cells (2) is fitted to cover the edge of one of the vent holes (11), and foam is provided between the bottom end cap (21) and the base plate (1) to form a sealing structure around the vent hole (11). A first explosion-proof valve (22) is provided in the area of ​​the bottom end cap (21) of the cylindrical cell (2) directly opposite the vent (11). The first explosion-proof valve (22), the vent (11) and the vent channel (12) are used to form the pressure relief path of the cylindrical cell (2).

2. The cylindrical battery pack according to claim 1, characterized in that, The foam between each of the bottom end caps (21) and the bottom plate (1) forms a closed ring-shaped foam gasket (31). The inner ring diameter of the foam gasket (31) is larger than the diameter of the vent hole (11), and / or the outer ring diameter of the foam gasket (31) is smaller than the diameter of the bottom cap (21), and / or the foam gasket (31) is bonded to the corresponding bottom cap (21).

3. The cylindrical battery pack according to claim 1, characterized in that, The cylindrical cells (2) are arranged in multiple rows, each row containing several cylindrical cells (2). The foam between the bottom end cap (21) of each row of cylindrical cells (2) and the base plate (1) extends and connects to form an integral foam pad (32).

4. The cylindrical battery pack according to claim 1, characterized in that, It also includes a box shell frame (4), the bottom plate (1) includes a first plate (101) and a second plate (102) arranged in parallel, the first plate (101) is provided with the exhaust hole (11), the exhaust hole (11) all penetrates the first plate (101); a periphery of the first plate (101) and the second plate (102) are fixed to the box shell frame (4), and the space enclosed by the first plate (101), the second plate (102) and the box shell frame (4) constitutes the exhaust channel (12).

5. The cylindrical battery pack according to claim 4, characterized in that, It also includes a casing cover plate (7), the casing cover plate (7), the casing frame (4) and the bottom plate (1) constitute the sealed casing of the cylindrical battery pack; The first plate (101) is also provided with an air guide hole (13), which penetrates the first plate (101) and is used to connect the exhaust channel (12) with the space inside the sealed housing; A second explosion-proof valve (6) is provided on the enclosure frame (4). The second explosion-proof valve (6) is located on the enclosure frame (4) in the part that encloses the internal space of the sealed housing.

6. The cylindrical battery pack according to claim 4, characterized in that, The enclosure frame (4) is a rectangular frame formed by connecting four first frames end to end; the first frames are formed by extrusion of aluminum alloy profiles and have a multi-chamber structure in cross-section. And / or, the inner side of the enclosure frame (4) is provided with an annular overlapping plate (41), the overlapping plate (41) is used to overlap with a periphery of the first plate (101); the bottom surface of the enclosure frame (4) is sealed to a periphery of the second plate (102).

7. The cylindrical battery pack according to claim 1, characterized in that, The cylindrical battery pack includes multiple module units, each module unit including multiple cylindrical cells (2), a module frame (51) and a module cover plate (52); the bottom open end of the module frame (51) is fixedly connected to the base plate (1), and the top open end is fixedly connected to the module cover plate (52). Multiple cylindrical cells (2) are disposed in the module frame (51) and the cylindrical cells (2) are filled with foam.

8. The cylindrical battery pack according to claim 7, characterized in that, A first foam plug (53) is provided between the module frame (51) and the base plate (1) to achieve a seal between the module frame (51) and the base plate (1); the first foam plug (53) has a U-shaped cross-section and wraps around the bottom edge of the module frame (51).

9. The cylindrical battery pack according to claim 7, characterized in that, The cylindrical cells (2) are arranged in multiple rows within the module frame (51). Each row of cylindrical cells (2) has a wave-shaped liquid cooling plate (54) on both sides. Two adjacent rows of cylindrical cells (2) share one wave-shaped liquid cooling plate (54). The two ends of the wave-shaped liquid cooling plate (54) pass through the pre-set openings (511) of the module frame (51) and extend to the outside of the module frame (51). Each opening (511) has multiple second foam plugs (55) at its edge to achieve a seal between the circumferential edge of the opening (511) and the wave-shaped liquid cooling plate (54).

10. A vehicle, characterized in that, Includes the cylindrical battery pack as described in any one of claims 1-9.

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