Battery pack

Abstract

The present application provides a battery pack, comprising: a cooling frame, the interior of which is provided with a plurality of columnar accommodating parts; a plurality of cylindrical battery monomers, wherein any cylindrical battery monomer is correspondingly arranged in one cylindrical accommodating part; the cooling flow channel is arranged in the cooling frame; wherein the inner side wall of the columnar accommodating part is provided with a windowing area, and the windowing area is communicated with the cooling flow channel and surrounds one part of the circumferential side surface of the corresponding cylindrical battery monomer, so that the cooling medium in the cooling flow channel exchanges heat with the cylindrical battery monomer; the cooling flow channel is arranged in the cooling frame, and the windowing area communicated with the cooling flow channel is formed in the inner side wall of the columnar accommodating part, so that when a cooling medium in the cooling flow channel flows through the windowing area, the cooling medium can be in direct contact with the single cylindrical batteries, and the cooling efficiency of the battery pack is improved; as the battery pack does not need to be additionally provided with a cold plate structure, the production cost of the battery pack is favorably controlled, and the economical efficiency of the battery pack and the market competitiveness of enterprises are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a battery pack. BACKGROUND

[0002] With the development of battery technology, cylindrical batteries have become an important part of the energy storage field due to their high energy density, long life, and reliability. To ensure the stability and safety of the performance of cylindrical batteries, a reasonably designed cooling system can effectively prevent performance degradation and safety hazards caused by overheating. Currently, the bottom of a battery pack composed of cylindrical batteries on the market usually has a cold plate structure. The cold plate structure can directly or indirectly absorb and dissipate the heat generated during the operation of the battery pack, thereby maintaining the battery pack within a relatively ideal temperature range, which helps to improve the working efficiency of the battery pack and prolong its service life. However, due to the relatively small contact area between the cold plate structure and the bottom of the cylindrical battery, the cooling efficiency of the cold plate structure on the cylindrical battery is limited, making it difficult to fully meet the cooling needs of the battery pack. In addition, to ensure good heat dissipation effect, the cold plate structure often requires high processing precision and high-quality materials, which is difficult to control the production cost of the battery pack and affects the economy and market competitiveness of the product. CONTENT OF THE UTILITY MODEL

[0003] Therefore, the present application aims to provide a battery pack to solve the above-mentioned technical problems.

[0004] To achieve the above purpose, the present application provides a battery pack, comprising:

[0005] a cooling frame, the inside of the cooling frame is provided with a plurality of cylindrical accommodating portions;

[0006] a plurality of cylindrical battery monomers, any cylindrical battery monomer is arranged in a cylindrical accommodating portion;

[0007] a cooling flow channel arranged in the cooling frame;

[0008] wherein the inner side wall of the cylindrical accommodating portion is provided with a windowed area, the windowed area is in communication with the cooling flow channel and surrounds a part of the circumferential side surface of the cylindrical battery monomer, so that the cooling medium in the cooling flow channel exchanges heat with the cylindrical battery monomer.

[0009] As can be seen from the above, the battery provided by the application has a plurality of columnar accommodating portions for mounting cylindrical battery monomers, a cooling flow channel is arranged in the cooling frame, and a windowed area in communication with the cooling flow channel is arranged on the inner side wall of the columnar accommodating portion, so that the windowed area surrounds a part of the circumferential side of the cylindrical battery monomer, so that the cooling flow channel and the cylindrical battery monomer have sufficient contact area; when the cooling medium flowing in the cooling flow channel flows through the windowed area, the cooling medium can directly contact the side of the cylindrical battery monomer, and the flowing cooling medium can be in sufficient contact with the cylindrical battery monomer, so that the cooling efficiency of the cooling medium on the cylindrical battery monomer is improved; in addition, since the battery does not need to additionally increase the cooling plate structure, the manufacturing difficulty of the battery can be reduced, the production cost of the battery can be controlled, and the overall economy of the battery and the core competitiveness of the enterprise can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0010] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0011] Figure 1 It is a schematic diagram of the three-dimensional structure of the first battery cooling system of the present application.

[0012] Figure 2 It is an exploded schematic diagram of the first battery cooling system of the present application.

[0013] Figure 3 It is a distribution schematic diagram of the cooling flow channel in the first battery cooling system of the present application.

[0014] Figure 4 It is a schematic diagram of the positional relationship between the cylindrical battery monomer and the cooling flow channel in the first battery cooling system of the present application.

[0015] Figure 5 It is a schematic diagram of the three-dimensional structure of the second battery cooling system of the present application.

[0016] Figure 6 It is a distribution schematic diagram of the cooling flow channel in the second battery cooling system of the present application.

[0017] Figure 7 It is a schematic diagram of the three-dimensional structure of the third battery cooling system of the present application.

[0018] Figure 8 It is a schematic diagram of the position of the partition plate in the third battery cooling system of the present application.

[0019] EXPLANATION OF REFERENCE NUMERALS:

[0020] 100, cooling frame; 101, columnar accommodating part; 102, windowed region; 103, first port; 104, second port;

[0021] 200, cylindrical battery cell; 201, insulating film;

[0022] 300, cooling flow channel; 301, partition plate;

[0023] 400, sealing layer. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with specific embodiments and with reference to the drawings.

[0025] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should be understood as the common meanings understood by those skilled in the art to which the present application belongs. The terms "first", "second" and similar terms used in the present application do not represent any order, number or importance, but are only used to distinguish different components. The terms "include" or "contain" and similar terms mean that the elements or objects before the terms cover the elements or objects listed after the terms and their equivalents, and do not exclude other elements or objects. The terms "connect" or "connected" and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms "upper", "lower", "left", "right" and the like are only used to represent relative positional relationships, and when the absolute positions of the described objects change, the relative positional relationships may also change accordingly.

[0026] In the field of battery technology, a battery pack is usually composed of a plurality of battery cells, which can be one of cylindrical batteries such as cylindrical batteries and prismatic batteries; in order to ensure the stable performance and safe reliability of the battery pack during operation, an efficient heat dissipation structure needs to be designed in the battery pack to avoid overheating of the battery pack during use, which is beneficial to improve the working efficiency of the battery pack and prolong the service life of the battery pack; therefore, most battery packs will integrate a cold plate structure at the bottom, which can directly or indirectly absorb and dissipate the heat generated by the cylindrical battery during operation through liquid cooling, so that the battery pack is in a relatively ideal temperature range.

[0027] At present, the cold plate structure heat dissipation technology still has obvious defects. On the one hand, the connection between the cold plate structure and the columnar battery usually depends on the thermal conductive glue. Although the thermal conductive glue has excellent thermal conductivity, the introduction of the thermal conductive glue not only increases the overall weight of the battery pack, but also forms additional thermal resistance between the cold plate structure and the columnar battery, thereby reducing the heat exchange efficiency. In addition, the bottom area of the columnar battery is relatively small, so the contact area with the cold plate structure is also relatively small, which will greatly reduce the heat dissipation effect of the cold plate structure and is difficult to meet the cooling demand of the battery pack.

[0028] On the other hand, in order to achieve high-efficiency heat dissipation performance, the material selection and processing precision of the cold plate structure have high requirements, which increases the production cost of the cold plate structure itself, and further increases the cost of the battery pack with the cold plate structure. In addition, in order to enhance the structural stability of the battery pack, polyurethane and other materials are mostly used as foaming glue in the industry to realize structural integration through pouring. However, the production process of the foaming glue is complex, and the parameter control is difficult, which easily affects the quality consistency of the product. At the same time, the high-density characteristics of the foaming glue are not conducive to the lightweight design of the battery pack, which brings many limitations to the application of the battery pack.

[0029] Therefore, the present application provides a battery pack, which comprises a cooling frame 100, a plurality of cylindrical battery monomers 200 and a cooling flow channel 300. The cooling frame 100 is internally provided with a plurality of columnar accommodating portions 101. In the plurality of cylindrical battery monomers 200, any cylindrical battery monomer 200 is correspondingly arranged in a columnar accommodating portion 101. The cooling flow channel 300 is arranged in the cooling frame 100. The inner side wall of the columnar accommodating portion 101 is provided with a windowed area 102, which is in communication with the cooling flow channel 300 and surrounds a part of the circumferential side surface of the corresponding cylindrical battery monomer 200, so that the cooling medium in the cooling flow channel 300 exchanges heat with the cylindrical battery monomer 200.

[0030] Specifically, please refer to Figures 1-4 , wherein, Figure 1 is a schematic diagram of the three-dimensional structure of the first battery cooling system of the present application, Figure 2 is an exploded schematic diagram of the first battery cooling system of the present application, Figure 3 is a distribution schematic diagram of the cooling flow channel 300 in the first battery cooling system of the present application, Figure 4 is a schematic diagram of the positional relationship between the cylindrical battery monomer 200 and the cooling flow channel 300 in the first battery cooling system of the present application.

[0031] The present application provides a battery pack with good cooling performance, such as Figures 1-4As shown, the battery pack includes a cooling frame 100 and a plurality of cylindrical battery cells 200, the cooling frame 100 is provided with a plurality of columnar accommodating portions 101, each cylindrical battery cell 200 is arranged in a columnar accommodating portion 101 respectively, so as to take the cooling frame 100 as the bearing main body of the battery pack, and the columnar accommodating portion 101 provided in the cooling frame 100 provides the mounting position for the cylindrical battery cell 200, so as to realize the batch application of the cylindrical battery cell 200; the cylindrical battery cell 200 can be used as the basic energy storage unit of the battery pack, and can store and release electric energy according to the application scene of the battery pack, so as to provide stable and reliable electric energy for external power consumption equipment.

[0032] In terms of the columnar accommodating portion 101, in order to improve the firmness of the cylindrical battery cell 200 in the columnar accommodating portion 101, the size of the columnar accommodating portion 101 can be matched with the size of the cylindrical battery cell 200; for example, as shown in Figure 1 and Figure 4 , the columnar accommodating portion 101 can be provided as a cylindrical hole matched with the cylindrical battery cell 200, so as to ensure that the cylindrical battery cell 200 can be closely attached to the inner side wall of the cylindrical hole, improve the firmness of the cylindrical battery cell 200 in the cylindrical hole, and avoid forming obvious gaps.

[0033] The battery pack provided in the present application further includes a cooling flow channel 300 for cooling the cylindrical battery cell 200, as shown in Figures 2-4 , the cooling flow channel 300 is arranged in the cooling frame 100, and in the columnar accommodating portion 101, the inner side wall of the columnar accommodating portion 101 is provided with a windowed area 102, and the windowed area 102 is in communication with the cooling flow channel 300; since the cylindrical battery cell 200 is installed in the columnar accommodating portion 101, and the windowed area 102 arranged on the inner side wall of the columnar accommodating portion 101 surrounds a part of the circumferential side surface of the corresponding cylindrical battery cell 200, when the cooling medium flows in the cooling flow channel 300, the cooling medium directly contacts the circumferential side surface of the cylindrical battery cell 200 through the windowed area 102 in communication with the cooling flow channel 300, so as to exchange heat between the cooling medium and the cylindrical battery cell 200, and take away the heat generated by the cylindrical battery cell 200 during the working process, so as to cool the cylindrical battery cell 200; since the cooling medium directly contacts the axial side surface of the cylindrical battery cell 200, the thermal resistance between them is relatively small, which is beneficial to improve the cooling efficiency of the battery by the cooling medium, and meet the heat dissipation requirement of the battery; in addition, since the cooling medium directly contacts the cylindrical battery cell 200, it is not necessary to additionally add heat-conducting glue and cold plate structure, nor to use foaming glue for filling and forming, so the requirement for the selection and processing of materials is relatively low, which is beneficial to control the manufacturing cost of the battery pack and enhance the market competitiveness of the enterprise.

[0034] In some embodiments, the cooling flow channel 300 is arranged in a serpentine shape along the flow direction of the cooling medium, and the plurality of columnar accommodating portions 101 are arranged in an interlaced manner on opposite sides of the cooling flow channel 300.

[0035] Specifically, referring to Figure 6 , Figure 6 FIG. 2 is a schematic diagram of the distribution of the cooling flow channel 300 in the second battery cooling system.

[0036] As for the cooling flow channel 300, by arranging the cooling flow channel 300 in the cooling frame 100 and making the cooling flow channel 300 communicate with the windowed area 102 formed on the inner side wall of the columnar accommodating portion 101, the cooling medium in the cooling flow channel 300 can directly contact the circumferential side of the cylindrical battery monomer 200 through the windowed area 102, thereby improving the cooling efficiency of the cooling medium on the cylindrical battery monomer 200; as shown in Figure 3 and Figure 6 As for the cooling flow channel 300, by arranging the cooling flow channel 300 in a serpentine shape along the flow direction of the cooling medium, the length of the cooling flow channel 300 in the cooling frame 100 can be extended, and the cooling effect of the cooling medium on the cylindrical battery monomer 200 can be improved.

[0037] In addition, for the columnar accommodating portion 101, the plurality of columnar accommodating portions 101 are arranged in an interlaced manner on opposite sides of the cooling flow channel 300, so that the arrangement form of the columnar accommodating portion 101 is adapted to the shape of the cooling flow channel 300, which is beneficial to increase the number of columnar accommodating portions 101 arranged in the cooling frame 100 and improve the capacity of the battery pack; since the cooling flow channel 300 communicates with the windowed area 102, the inner side wall of the cooling flow channel 300 can coincide with the windowed area 102; for example, the contact area of the windowed area 102 with the cylindrical battery monomer 200 can account for 30%-90% of the circumferential side area of the cylindrical battery monomer 200, so that the cooling medium flowing in the cooling flow channel 300 directly contacts the circumferential side of the cylindrical battery monomer 200, which can not only ensure the cooling effect of the cooling medium on the cylindrical battery monomer 200, but also will not increase the obvious resistance of the cooling flow channel 300 to the cooling medium, so as to ensure the smoothness of the flow of the cooling medium.

[0038] In some embodiments, a plurality of cooling flow channels 300 are arranged in the cooling frame 100, the cooling medium in the plurality of cooling flow channels 300 flows in the same direction, and the adjacent two cooling flow channels 300 are not communicated.

[0039] As for the cooling flow channel 300, the cooling flow channel 300 in the cooling frame 100 is used to cool the cylindrical battery monomer 200 of the battery pack, thereby providing a suitable working temperature for the cylindrical battery monomer 200; as shown in Figure 3 and Figure 4As shown in FIG. 1 and FIG. 2, the cooling frame 100 is provided with a plurality of cooling flow channels 300, which can improve the heat dissipation speed of the battery pack and reduce the probability of local temperature overhigh of the battery pack; when the cooling frame 100 is provided with a plurality of cooling flow channels 300, the cooling medium in the plurality of cooling flow channels 300 can flow in the same direction, and the adjacent two cooling flow channels 300 are not connected; at this time, the plurality of cooling flow channels 300 are arranged side by side and independent of each other, and the flow of the cooling medium in each cooling flow channel 300 can be adjusted according to the actual application of the battery pack, so that the heat dissipation capacity of each part of the battery pack can be flexibly adjusted; in addition, when some of the cooling flow channels 300 are blocked, it will not interfere with other cooling flow channels 300, which is beneficial to ensure the safety of the battery pack.

[0040] In some embodiments, the cooling frame 100 is provided with a plurality of cooling flow channels 300, and the plurality of cooling flow channels 300 are sequentially connected, and the cooling medium in the adjacent two cooling flow channels 300 flows in opposite directions.

[0041] Specifically, as shown in FIG. 1 and FIG. 2, the cooling frame 100 is provided with a plurality of cooling flow channels 300, which can improve the heat dissipation speed of the battery pack and reduce the probability of local temperature overhigh of the battery pack; when the cooling frame 100 is provided with a plurality of cooling flow channels 300, the cooling medium in the plurality of cooling flow channels 300 can flow in the same direction, and the adjacent two cooling flow channels 300 are not connected; at this time, the plurality of cooling flow channels 300 are arranged side by side and independent of each other, and the flow of the cooling medium in each cooling flow channel 300 can be adjusted according to the actual application of the battery pack, so that the heat dissipation capacity of each part of the battery pack can be flexibly adjusted; in addition, when some of the cooling flow channels 300 are blocked, it will not interfere with other cooling flow channels 300, which is beneficial to ensure the safety of the battery pack. Figure 5 Figure 5 FIG. 1 and FIG. 2 are schematic diagrams of the third battery cooling system according to the present application.

[0042] As for the cooling flow channel 300, the cooling flow channel 300 arranged in the cooling frame 100 is used to cool the cylindrical battery cell 200 of the battery pack, so as to provide a suitable working temperature for the cylindrical battery cell 200; as shown in FIG. 1 and FIG. 2, by arranging a plurality of cooling flow channels 300 in the cooling frame 100, the heat dissipation speed of the battery pack can be improved, and the probability of local temperature overhigh of the battery pack can be reduced; when a plurality of cooling flow channels 300 are arranged in the cooling frame 100, the plurality of cooling flow channels 300 are arranged in series connection by arranging the plurality of cooling flow channels 300 to be sequentially connected, and the cooling medium in the adjacent two cooling flow channels 300 flows in opposite directions, so that the plurality of cooling flow channels 300 are connected in series, and a serpentine flow channel structure is formed along the vertical direction of the flow direction of the cooling medium; by designing the cooling flow channel 300 as a serpentine flow channel structure, the number of surface ports of the cooling frame 100 can be reduced, and the delicacy of the battery pack can be improved; as for the serpentine flow channel structure, the flow path of the cooling medium in the serpentine flow channel structure is lengthened, which is beneficial to improve the utilization rate of the cooling medium. Figure 5 Figure 6 As for the cooling flow channel 300, the cooling flow channel 300 arranged in the cooling frame 100 is used to cool the cylindrical battery cell 200 of the battery pack, so as to provide a suitable working temperature for the cylindrical battery cell 200; as shown in FIG. 1 and FIG. 2, by arranging a plurality of cooling flow channels 300 in the cooling frame 100, the heat dissipation speed of the battery pack can be improved, and the probability of local temperature overhigh of the battery pack can be reduced; when a plurality of cooling flow channels 300 are arranged in the cooling frame 100, the plurality of cooling flow channels 300 are arranged in series connection by arranging the plurality of cooling flow channels 300 to be sequentially connected, and the cooling medium in the adjacent two cooling flow channels 300 flows in opposite directions, so that the plurality of cooling flow channels 300 are connected in series, and a serpentine flow channel structure is formed along the vertical direction of the flow direction of the cooling medium; by designing the cooling flow channel 300 as a serpentine flow channel structure, the number of surface ports of the cooling frame 100 can be reduced, and the delicacy of the battery pack can be improved; as for the serpentine flow channel structure, the flow path of the cooling medium in the serpentine flow channel structure is lengthened, which is beneficial to improve the utilization rate of the cooling medium.

[0043] In some embodiments, the cooling flow channel 300 is provided with a partition plate 301, and the partition plate 301 divides the cooling flow channel 300 into a plurality of sub-flow channels; the cooling medium in the plurality of sub-flow channels flows in the same direction and is not connected; or the plurality of sub-flow channels are sequentially connected, and the cooling medium in the adjacent two sub-flow channels flows in opposite directions.

[0044] Specifically, please refer to Figure 7 and Figure 8 ​​, Figure 7 FIG. 3 is a perspective view of a third battery cooling system according to the present application; Figure 8 FIG. 4 is a schematic view of the position of the partition plate 301 in the third battery cooling system according to the present application.

[0045] In terms of the cooling flow channel 300, the cooling flow channel 300 arranged in the cooling frame 100 is used to cool the cylindrical battery cell 200 of the battery pack, so as to provide a suitable working temperature for the cylindrical battery cell 200; as shown in FIG. 2, the cooling flow channel 300 is arranged in the cooling frame 100, and the cylindrical battery cell 200 is arranged in the cooling flow channel 300. Figure 7 and Figure 8 As shown in FIG. 3, by arranging the partition plate 301 in the cooling flow channel 300, the corresponding cooling flow channel 300 can be divided into multiple sub-flow channels; for example, one partition plate 301 is arranged in one cooling flow channel 300, so that the cooling flow channel 300 is divided into two sub-flow channels, which can reduce the size of the flow channel, so that the cooling medium flowing into the cooling flow channel 300 can be uniformly distributed inside the cooling flow channel 300, thereby improving the cooling effect of the cooling medium.

[0046] Exemplarily, the partition plate 301 arranged in the cooling flow channel 300 can divide the cooling flow channel 300 into multiple non-communicating sub-flow channels; when the cooling medium enters the inside of the cooling flow channel 300, the cooling medium can be divided into multiple streams by the partition plate 301, and the flow directions of the multiple streams of cooling medium flowing into the sub-flow channels are the same, thereby improving the uniformity of the distribution of the cooling medium in the cooling flow channel 300, and further improving the cooling effect of the cooling medium.

[0047] Exemplarily, the partition plate 301 arranged in the cooling flow channel 300 can divide the cooling flow channel 300 into multiple sequentially communicating cooling flow channels 300; along the flow direction of the cooling medium, the multiple sub-flow channels can also form a serpentine flow channel structure, that is, when the cooling medium flows into the inside of the serpentine flow channel structure, it can sequentially flow through all the sub-flow channel structures, so that the cooling medium uniformly fills the entire cooling flow channel 300, which is beneficial to prolong the flow path of the cooling medium in the cooling frame 100 and improve the utilization rate of the cooling medium.

[0048] In some embodiments, along the flow direction of the cooling medium, the partition plate 301 is arranged in a serpentine shape and is adapted to the shape of the cooling flow channel 300;

[0049] As to the partition plate 301, since the partition plate 301 is used to divide the cooling flow channel 300 into multiple sub-flow channels, by making the partition plate 301 be arranged in a serpentine manner, and the shape of the partition plate 301 is adapted to the shape of the cooling flow channel 300, it is ensured that the cooling liquid can be uniformly distributed after entering the inside of the cooling flow channel 300, and the interference degree between adjacent sub-flow channels is reduced, and the smoothness of the cooling medium flowing in the cooling flow channel 300 is ensured; it should be noted that the number of the partition plate 301 arranged in each cooling flow channel 300 can be selected according to the size of the cooling flow channel 300 and the actual needs, and when at least two partition plates 301 are arranged in the same cooling flow channel 300, the two partition plates 301 can be arranged in parallel, which will not be described here.

[0050] In some embodiments, the circumferential side of the cylindrical battery cell 200 is provided with an insulating film 201, the insulating film 201 is arranged between the windowed area 102 and the cylindrical battery cell 200, and the orthographic projection of the windowed area 102 on the insulating film 201 is located in the insulating film 201.

[0051] As to the battery pack, the cooling flow channel 300 is arranged in the cooling frame 100 and is in communication with the windowed area 102 opened in the inner side wall of the cylindrical accommodating portion 101, so that the cooling medium flowing in the cooling flow channel 300 can directly contact and cool the circumferential side of the cylindrical battery cell 200, and the cooling efficiency of the cooling medium on the cylindrical battery cell 200 is improved; as Figure 4 and Figure 8 As shown in the drawings, for the cylindrical cylindrical battery cell 200, the outer surface of the cylindrical battery cell 200 generally serves as its negative electrode structure, by arranging the insulating film 201 on the circumferential side of the cylindrical battery cell 200, the insulating film 201 is arranged between the windowed area 102 and the cylindrical battery cell 200, and at the same time, the orthographic projection of the windowed area 102 on the insulating film 201 is located in the insulating film 201, so as to avoid the direct contact between the cooling medium and the cylindrical battery cell 200 to cause the short circuit of the battery pack, and improve the safety of the battery pack in use.

[0052] In combination with the above embodiments, the insulating film 201 is further described. For the insulating film 201, the insulating film 201 can be arranged around the cylindrical battery monomer 200 to cover the circumferential side of the cylindrical battery monomer 200. Meanwhile, the insulating film 201 can also completely cover the bottom of the cylindrical battery monomer 200, which can further improve the insulation of the cylindrical battery monomer 200. The insulating film 201 arranged around the circumferential side of the cylindrical battery monomer 200 can also fill the gap between the side wall of the cylindrical battery monomer 200 and the cylindrical accommodating part 101, which can not only avoid the leakage of the cooling medium, but also improve the firmness of the cylindrical battery monomer 200 in the cylindrical accommodating part 101. For example, the insulating layer can be formed by spraying, dipping, chemical vapor deposition (CVD), physical vapor deposition (PVD), etc., which will not be described here.

[0053] In some embodiments, along the height direction of the cooling frame 100, the height of the cooling flow channel 300 is less than the height of the cylindrical battery monomer 200.

[0054] For the battery pack, the cooling flow channel 300 arranged in the cooling frame 100 can cool a part of the circumferential side of the cylindrical battery monomer 200 through the windowed area 102. For the cooling flow channel 300, as shown in Figure 4 and Figure 8 As shown, along the height direction of the cooling frame 100, by setting the height of the cooling flow channel 300 to be less than the height of the cylindrical battery monomer 200, the cooling flow channel 300 can form a cavity with good airtightness in the cooling frame 100, which can ensure that the cooling medium in the cooling flow channel 300 can fully contact the cylindrical battery monomer 200.

[0055] In some embodiments, the battery pack further comprises a sealing layer 400 arranged on the top of the cooling frame 100 and covering at least part of the cylindrical battery monomer 200. The sealing layer 400 is configured to fix the cylindrical accommodating part 101 in the cylindrical accommodating part 101.

[0056] For the battery pack, a plurality of cylindrical battery monomers 200 are installed in the cooling frame 100 through the cylindrical accommodating part 101, as shown in Figure 2 As shown, since the cylindrical battery monomer 200 is cooperatively embedded in the cylindrical accommodating part 101, by arranging the sealing layer 400 on the top of the cooling frame 100 and covering at least part of the cylindrical battery monomer 200, the sealing layer 400 can be connected with the top of the cooling frame 100 and at least part of the top of the cylindrical battery monomer 200, respectively, so that the cylindrical battery monomer 200 can be firmly fixed inside the cylindrical accommodating part 101, which can further reinforce the cylindrical battery monomer 200 to increase the firmness of the cylindrical battery monomer 200 in the cooling frame 100.

[0057] The sealing layer 400 can be formed by any adhesive with good sealing performance, stable flow leveling property and excellent heat resistance. To ensure that the adhesive can form a flat sealing layer 400 on the top of the cooling frame 100, the adhesive used should be able to solidify after flowing. Details are not described herein.

[0058] In some embodiments, the cooling frame 100 is formed of an insulating material, and the cooling flow channel 300 is a cavity formed in the insulating material.

[0059] For a battery pack, since the cooling frame 100 serves as a bearing body for the plurality of cylindrical battery cells 200, by forming the cooling frame 100 of an insulating material, not only can a good working environment be provided for the cylindrical battery cells 200, but also the cylindrical battery cells 200 can be insulated and separated from each other to prevent short circuit of the battery pack during use, thereby improving the safety of the battery application process. In addition, since the cooling flow channel 300 is arranged inside the cooling frame 100, when the cooling frame 100 is made of an insulating material, a cavity can be formed in the cooling frame 100, and at least one cooling flow channel 300 can be constructed through the cavity to cool the cylindrical battery cells 200 by the cooling medium flowing into the cavity, without the need to add a cooling plate structure to make the battery pack have good heat dissipation effect.

[0060] For example, the cooling frame 100 can be made of a non-metal material with insulation. In addition to good insulation, it also has excellent heat resistance and high strength, including hard plastics such as ABS (acrylonitrile-butadiene-styrene copolymer), PA (polyamide, i.e. nylon), PE (polyethylene), PP (polypropylene), PS (polystyrene), PMMA (polymethyl methacrylate, i.e. organic glass), PVC (polyvinyl chloride), polycarbonate, polyurethane, phenolic plastic and polystyrene, etc., artificial rubber, and special engineering plastics such as polyimide, polyphenylene sulfide and polysulfone. Different materials can be selected according to different needs such as overall structure, mechanical properties, processing method, weight requirement, heat resistance index and cost budget of the battery pack. Details are not described herein.

[0061] In some embodiments, the outer side wall of the cooling frame 100 is provided with a first port 103 and a second port 104, and the first port 103 and the second port 104 are respectively connected to opposite ends of the cooling flow channel 300.

[0062] For a battery pack, as described above, Figures 1-3 and Figures 5-7As shown, the first port 103 and the second port 104 are both arranged on the outer side wall of the cooling frame 100, and both are communicated with opposite ends of the cooling flow channel 300. Since the cooling medium needs to be delivered into the cooling flow channel 300 and cool the cylindrical battery monomer 200, one of the first port 103 and the second port 104 can be used as an inlet, and the other can be used as an outlet, so as to ensure the smooth flow of the cooling medium in the cooling flow channel 300.

[0063] As shown in the drawings, Figures 1-3 when a plurality of cooling flow channels 300 are arranged in parallel in the cooling frame 100, a plurality of first ports 103 and a plurality of second ports 104 can be arranged on opposite sides of the cooling frame 100, so that each cooling flow channel 300 is communicated with a first port 103 and a second port 104 respectively, and a plurality of cooling flow channels 300 can provide cooling liquid at the same time. In addition, the plurality of first ports 103 can be simultaneously communicated with a first common pipeline (not marked in the figure), and the plurality of second ports 104 can be simultaneously communicated with a second common pipeline (not marked in the figure), which is conducive to the centralized supply and discharge of the cooling medium.

[0064] As shown in the drawings, Figure 5 and Figure 6 when a plurality of cooling flow channels 300 are arranged in parallel in the cooling frame 100, a plurality of cooling flow channels 300 can form a serpentine flow channel structure along the direction perpendicular to the flow direction of the cooling medium. At this time, one first port 103 and one second port 104 are arranged on opposite sides of the cooling frame 100 and communicated with opposite ends of the serpentine flow channel structure, so as to prolong the flow path of the cooling medium in the cooling frame 100, reduce the number of applications of the first port 103 and the second port 104, and reduce the complexity of the liquid supply structure and the liquid discharge structure, thereby reducing the cost investment of the battery pack.

[0065] As shown in the drawings, Figure 7 and Figure 8As shown, a plurality of cooling flow channels 300 are arranged side by side in the cooling frame 100, and each cooling flow channel 300 can be provided with a partition plate 301, each partition plate 301 can divide the cooling flow channel 300 into two sub-flow channels in communication with each other; the first port 103 and the second port 104 are respectively connected to the end portions of the two sub-flow channels, so the first port 103 and the second port 104 can be arranged on the same side of the cooling frame 100; and since the cooling frame 100 is provided with a plurality of parallel cooling flow channels 300, the same side of the cooling frame 100 is provided with a plurality of first ports 103 and a plurality of second ports 104, the plurality of first ports 103 can be simultaneously connected to a first common pipeline, and the plurality of second ports 104 can be simultaneously connected to a second common pipeline, which is conducive to the centralized supply and discharge of the cooling medium.

[0066] It should be understood by those of ordinary skill in the art that the above discussion of any embodiment is merely exemplary and is not intended to suggest the scope of the present application (including claims) is limited to these examples; under the idea of the present application, the above embodiments or technical features in different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes of different aspects of the present application as described above, which are not provided in detail for the sake of brevity.

[0067] Embodiments of the present application are intended to cover all such alternatives, modifications, and variations as fall within the broad scope of the appended claims. Accordingly, any and all such modifications, variations, or equivalents that fall within the spirit and scope of the present application are intended to be included within the scope of the present application.

Claims

1. A battery pack, characterized in that, include: A cooling frame, wherein the interior of the cooling frame has multiple columnar receiving portions; Multiple cylindrical battery cells, each of which is disposed within a cylindrical receiving portion; Cooling channels are disposed within the cooling frame; The inner wall of the cylindrical receiving portion is provided with a window area, which is connected to the cooling channel and surrounds a portion of the circumferential side of the corresponding cylindrical battery cell, so that the cooling medium in the cooling channel can exchange heat with the cylindrical battery cell.

2. The battery pack according to claim 1, characterized in that, Along the flow direction of the cooling medium, the cooling channel is arranged in a serpentine pattern, and a plurality of columnar receiving portions are staggered on opposite sides of the cooling channel.

3. The battery pack according to claim 2, characterized in that, The cooling frame is provided with multiple cooling channels, the cooling medium in the multiple cooling channels flows in the same direction, and multiple adjacent cooling channels are not connected.

4. The battery pack according to claim 2, characterized in that, The cooling frame is provided with multiple cooling channels, which are connected sequentially, and the cooling medium in adjacent cooling channels flows in opposite directions.

5. The battery pack according to claim 2, characterized in that, A partition plate is provided inside the cooling channel, dividing the cooling channel into multiple sub-channels; the cooling medium in each of the multiple sub-channels flows in the same direction and is not interconnected; or The multiple sub-channels are connected sequentially, and the flow direction of the cooling medium in two adjacent sub-channels is opposite.

6. The battery pack according to claim 5, characterized in that, Along the flow direction of the cooling medium, the partition plate is arranged in a serpentine pattern and is adapted to the shape of the cooling channel.

7. The battery pack according to claim 2, characterized in that, An insulating film is provided on the circumferential side of the cylindrical battery cell. The insulating film is disposed between the window area and the cylindrical battery cell, and the orthogonal projection of the window area onto the insulating film is located within the insulating film.

8. The battery pack according to claim 1, characterized in that, Along the height direction of the cooling frame, the height of the cooling channel is less than the height of the cylindrical battery cell.

9. The battery pack according to claim 8, characterized in that, Also includes: A sealing layer is disposed on top of the cooling frame and covers at least a portion of the cylindrical battery cell; The sealing layer is configured to secure the cylindrical battery cell within the columnar receiving portion.

10. The battery pack according to claim 8, characterized in that, The cooling frame is formed of an insulating material, and the cooling channels are cavities formed within the insulating material.

11. The battery pack according to any one of claims 1-10, characterized in that, The outer wall of the cooling frame is provided with a first port and a second port, which are respectively connected to the opposite ends of the cooling channel.

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