Cylindrical battery device

Abstract

The utility model belongs to the technical field of batteries, and discloses a cylindrical battery device, which comprises a bottom plate and at least one battery cell component supported on the bottom plate, the battery cell assembly comprises a cold plate and a battery column stacked in a certain direction, the cold plate is arranged on at least one side of the battery column, and the extension direction of the cold plate is consistent with the stacking direction of the battery column; at least one end of the cold plate along the extension direction of the cold plate is provided with an inclined part facing the battery column, the plane where the large surface of the inclined part is located and the extension direction of the cold plate form an included angle a, and the included angle a is more than or equal to 30 degrees and less than or equal to 90 degrees. The cylindrical battery device provided by the utility model has relatively high heat dissipation efficiency and heat dissipation effect.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a cylindrical battery device. Background Technology

[0002] Cylindrical battery modules are typically formed by connecting multiple cylindrical batteries in series or parallel. As the energy requirements of electrical equipment such as new energy vehicles increase, the number of cylindrical batteries in cylindrical battery modules is increasing. At the same time, the requirements for fast charging time are getting higher and higher, and the fast charging rate of cylindrical batteries is getting higher and higher. Thermal management and thermal safety of cylindrical battery modules have a significant impact on the development of cylindrical battery modules, and therefore, cooling of each cylindrical battery is crucial.

[0003] In existing technologies, cooling is achieved by placing cold plates between cylindrical batteries. Coolant flows through the cold plates, absorbing the heat generated by the cylindrical batteries. Typically, the cold plates extend parallel to the arrangement direction of the cylindrical batteries, and the portion of the cold plate that contacts the middle cylindrical battery is arc-shaped to provide a larger heat dissipation area. However, the tail end of the cold plate is usually straight and extends along the arrangement direction of the cylindrical batteries. This results in only a portion of the outer circumference of the end batteries contacting the cold plate, leading to lower heat dissipation efficiency and poor heat dissipation effect for the end batteries, thus affecting the thermal safety of the entire cylindrical battery module. Utility Model Content

[0004] The purpose of this invention is to provide a cylindrical battery device that has high heat dissipation efficiency and heat dissipation effect.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A cylindrical battery device, comprising a base plate and at least one cell assembly supported on the base plate;

[0007] The cell assembly includes a cold plate and a battery array stacked in a certain direction. The cold plate is disposed on at least one side of the battery array, and the extending direction of the cold plate is consistent with the stacking direction of the battery array.

[0008] At least one end of the cold plate along its extension direction is provided with an inclined portion facing the battery array. The plane containing the large surface of the inclined portion is set at an angle to the extension direction of the cold plate, and the angle is α, wherein 30°≤α≤90°.

[0009] The beneficial effects of this utility model are:

[0010] The cylindrical battery device provided by this utility model has a cold plate disposed on at least one side of the battery array to cool the battery array. At least one end of the cold plate along the extending direction of the cold plate is provided with an inclined portion that is inclined towards the battery array, so as to increase the contact area between the cold plate and the individual cells at the end of the battery array, thereby increasing the heat exchange area between the cold plate and the individual cells at the end of the battery array, improving the heat dissipation efficiency and heat dissipation effect of the individual cells at the end, so that each individual cell of the cylindrical battery device has a large contact area with the cold plate, thereby improving the heat exchange efficiency of the entire cylindrical battery device and ensuring the thermal safety of the cylindrical battery device. Attached Figure Description

[0011] Figure 1 This is a first structural schematic diagram of the cylindrical battery device provided in this embodiment of the present invention;

[0012] Figure 2 This is a top view of the cylindrical battery device provided in this embodiment of the present invention;

[0013] Figure 3 This is a schematic diagram of the structure of the battery cell assembly provided in this embodiment of the utility model;

[0014] Figure 4 This is a top view of the battery cell assembly provided in this embodiment of the utility model;

[0015] Figure 5 This is a schematic diagram of the structure of the cold plate provided in an embodiment of the present utility model;

[0016] Figure 6 This is a second structural schematic diagram of the cylindrical battery device provided in this embodiment of the present invention;

[0017] Figure 7 This is a utility model Figure 6 The enlarged view of point A shown.

[0018] In the picture:

[0019] 100. Base plate;

[0020] 200. Cell assembly; 210. Battery array; 211. Battery; 2111. Pre-installed battery; 220. Cold plate; 221. Inclined section; 2211. Straight section; 2212. First side; 2213. Second side; 222. Inlet; 223. Outlet;

[0021] 300. Positioning component; 310. Positioning plate; 320. Reinforcing plate;

[0022] Y, first direction; X, second direction; W, third direction. Detailed Implementation

[0023] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0024] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0025] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0026] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0027] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0028] This embodiment provides a cylindrical battery device that has high heat dissipation efficiency and good heat dissipation effect.

[0029] like Figures 1 to 7As shown, the cylindrical battery device includes a base plate 100 and at least one cell assembly 200 supported on the base plate 100. Each cell assembly 200 includes a cold plate 220 and a battery column 210 stacked along a certain direction. The battery column 210 is formed by stacking multiple individual cells 211 along a stacking direction. It should be noted that the cold plate 220 is disposed on at least one side of the battery column 210; specifically, the cold plate 220 is disposed on at least one side of the battery column 210 in a direction perpendicular to the stacking direction, that is, in... Figure 4 In this embodiment, a cold plate 220 is provided on at least one side of the battery array 210 in the first direction Y. The cold plate 220 is used to absorb the heat of the individual battery cells 211. In this embodiment, the extending direction of the cold plate 220 is consistent with the stacking direction of the battery array 210, so that the cold plate 220 can absorb the heat of multiple individual battery cells 211. In this embodiment, the stacking direction of the multiple individual battery cells 211 in the battery array 210 is referred to as the second direction X.

[0030] In some alternative embodiments, each individual battery cell 211 is positioned on the base plate 100. For example, the base plate 100 may have a groove for fixing the individual battery cell 211, and the individual battery cell 211 is confined in the groove to prevent shaking. Of course, it is understood that the individual battery cell 211 can also be positioned on the base plate 100 in other ways, and this embodiment does not limit this.

[0031] In some optional embodiments, the cold plate 220 has a hollow structure and an inner cavity in which a cooling fluid flows. Heat from the individual battery 211 is transferred to the cold plate 220, and the cooling fluid is used to absorb the heat from the cold plate 220, thereby dissipating heat from the individual battery 211.

[0032] Furthermore, at least one end of the cold plate 220 along its extending direction is provided with an inclined portion 221 that is inclined toward the battery array 210. That is, the inclined portion 221 is inclined toward the individual battery cell 211 located at the end of the battery array 210 in the stacking direction. The inner cavity of the cold plate 220 extends to the inclined portion 221, so that cooling fluid also flows within the inclined portion 221. By providing the inclined portion 221, the contact area between the cold plate 220 and the individual battery cell 211 at the end of the battery array 210 can be increased, thereby increasing the heat exchange area between the two and improving the heat dissipation efficiency and effect of the individual battery cell 211 at that end. This ensures that each individual battery cell 211 of the cylindrical battery device has a large contact area with the cold plate 220, thereby improving the heat exchange efficiency of the entire cylindrical battery device and ensuring the thermal safety of the cylindrical battery device.

[0033] For example, such as Figure 4As shown, the plane containing the large surface of the inclined portion 221 is set at an angle to the extending direction of the cold plate 220, and the angle between the plane containing the large surface of the inclined portion 221 and the extending direction of the cold plate 220 is α, where 30°≤α≤90°. This ensures that the cold plate 220 and the individual battery cells 211 located at the end of the battery array 210 in the stacking direction (i.e., the second direction X) have a large contact area. In this embodiment, as... Figure 4 As shown, the extension direction of the inclined portion 221 is named the third direction W. The first direction Y, the second direction X, and the third direction W are located in the same plane. For example, the angle between the plane containing the large surface of the inclined portion 221 and the extension direction of the cold plate 220 is 30°, 40°, 45°, 48°, 50°, 60°, 70°, 80°, or 90°.

[0034] It should be noted that the large surface of the inclined portion 221 is the surface with the larger area among the side surfaces of the inclined portion 221. For example, if the inclined portion 221 is plate-shaped, the large surface of the inclined portion 221 is the surface in the thickness direction of the plate-shaped inclined portion 221.

[0035] It should also be noted that the angle between the plane containing the large surface of the inclined portion 221 and the extension direction of the cold plate 220 is complementary to the angle between the plane containing the large surface of the inclined portion 221 and the first direction Y. That is, the angle between the plane containing the large surface of the inclined portion 221 and the first direction Y is in the range of 0-60°.

[0036] Optionally, such as Figure 3 As shown, each cell assembly 200 includes two battery columns 210, the arrangement direction of the two battery columns 210 being perpendicular to the stacking direction of the battery columns 210, that is, the two battery columns 210 are arranged along the first direction Y. A cold plate 220 of each cell assembly 200 is disposed between the two battery columns 210 to cool the individual cells 211 of the two battery columns 210.

[0037] In some optional embodiments, 40°≤a≤80°, that is, the angle between the plane containing the large surface of the inclined portion 221 and the extending direction of the cold plate 220 is 40°-80°, so that the inclined portion 221 can tilt towards the single cell 211 at the end with a larger degree, thereby further increasing the contact area between the inclined portion 221 and the single cell 211 at the end, and further improving the heat exchange efficiency between the cold plate 220 and the single cell 211 at the end. It should be noted that when the inclined portion 221 is tilted towards the single cell 211 at the end, the distance between the inclined portion 221 and the single cell 211 at the end is small, so that the temperature of the space around the single cell 211 at the end is low, which can realize radiative heat dissipation, thereby improving the heat dissipation efficiency of the single cell 211 at the end, and ensuring heat exchange efficiency and heat dissipation effect.

[0038] In some alternative embodiments, such as Figure 3 As shown, the cold plate 220 is provided with an inlet 222 and an outlet 223. The inlet 222 and the outlet 223 communicate with the inner cavity of the cold plate 220 and are used for the inflow and outflow of cooling fluid in the inner cavity. In this embodiment, the inlet 222 and the outlet 223 are located at the same end of the cold plate 220 along the extension direction of the cold plate 220, that is, the inlet 222 and the outlet 223 are located at the same end of the cold plate 220 in the second direction X. Furthermore, 45°≤a≤90°, that is, the angle between the plane of the large surface of the inclined portion 221 and the extension direction of the cold plate 220 is 45°-90°, so that the inclined portion 221 can be closer to the single cell 211 at the end, so as to ensure the consistency of heat exchange efficiency of multiple single cells 211 in a cell assembly 200 and improve the overall heat dissipation efficiency and heat dissipation effect of the cylindrical battery device.

[0039] Alternatively, the inlet 222 and the outlet 223 are disposed at one end of the cold plate 220 away from the inclined portion 221 along the extension direction of the cold plate 220 (i.e., the second direction X). That is, the inclined portion 221 and the inlet 222 (or outlet 223) are disposed at two ends in the extension direction of the cold plate 220. In this way, on the one hand, it facilitates the connection of the inlet 222 and the outlet 223 between multiple cold plates 220. For example, it facilitates the setting of shorter pipes between cold plates 220, reducing material consumption. On the other hand, since the inlet 222 and the outlet 223 are at the same end in the length direction of the cold plate 220, the inclined part 221 will be far away from the inlet 222. This makes the heat exchange efficiency between the inclined part 221 and the end cell 211 lower than the heat exchange efficiency between the cold plate 220 and the middle cell 211. In this embodiment, the inclined part 221 is tilted towards the end cell 211, which can ensure the consistency of the heat exchange efficiency of multiple cells 211, reduce the occurrence of some cells 211 being too hot due to poor heat dissipation, and further improve the thermal safety of the cylindrical battery device.

[0040] For example, such as Figure 5As shown, the inclined portion 221 has a straight section 2211, the length of which is L1, and the value of L1 ranges from 5mm to 50mm. The straight section 2211 prevents the cold plate 220 from being excessively bent, thus avoiding affecting the flow rate of the internal cooling fluid. This ensures that the inclined portion 221 does not excessively increase the flow resistance of the cold plate 220, balancing heat dissipation for the end cells 211 and low resistance of the cold plate 220. For example, the length L1 of the straight section 2211 can be 5mm, 15mm, 20mm, 25mm, 28mm, 30mm, 35mm, 45mm, or 50mm. In this embodiment, the length L1 of the straight section 2211 should not be too long, as excessive length may interfere with other cell components 200 and increase the arrangement space, affecting the improvement of the energy density of the cylindrical battery device.

[0041] In this embodiment, the extension direction of the inclined portion 221 can be the length direction of the straight segment 2211. Of course, it is understood that the extension direction of the inclined portion 221 may not be the length direction of the straight segment 2211, and this embodiment does not limit this.

[0042] It should be noted that the angle between the plane containing the large surface of the inclined portion 221 and the extending direction of the cold plate 220 is specifically the angle between the extending direction of the straight section 2211 and the extending direction of the cold plate 220. In this way, the straight section 2211 can be inclined toward the end cell 211 to ensure the dissipation effect on the end cell 211.

[0043] It is understood that the inclined portion 221 may also include a curved section (not shown in the figure). The curved section can be used to achieve the inclination of the inclined portion 221 relative to the end of the cold plate 220 towards the single cell 211, and the curved section can better fit and contact the outer peripheral surface of the single cell 211 for heat exchange. Of course, it is understood that the inclined portion 221 may also not include the curved section, and this embodiment does not limit this.

[0044] The cylindrical battery device provided in this embodiment has a cold plate 220 with an inclined portion 221, which can improve the heat exchange efficiency between the cold plate 220 and the end cell 211, thereby improving the heat dissipation efficiency and heat dissipation effect of the end cell 211, ensuring that the temperature difference between the end cell 211 and other cell 211s is not too large, and avoiding the "short board effect".

[0045] For example, such as Figure 1 and Figure 2As shown, in each cell assembly 200, multiple individual cells 211 in the two battery rows 210 are staggered in the second direction X. That is, the individual cells 211 in the two battery rows 210 are not symmetrically arranged, but staggered. Furthermore, the multiple individual cells 211 are not symmetrically arranged with the cold plate 220 as the center of symmetry, but staggered. This increases space utilization and improves the energy density of the cylindrical battery device. It should be noted that the staggered arrangement of multiple individual cells 211 in the second direction X in this embodiment can also be understood as the axes of the multiple individual cells 211 being spaced apart in the second direction X.

[0046] Further optionally, when the multiple individual cells 211 of the two battery columns 210 are misaligned in the second direction X, such as Figure 4 and Figure 5 As shown, the cold plate 220 located between the two battery columns 210 is wavy, so that the cold plate 220 has a portion that can be bent toward each individual battery 211 except for the individual battery 211 at the end, so that it has a large contact area with each individual battery 211, increasing the contact area between the cold plate 220 and the two battery columns 210, and further improving the heat dissipation effect.

[0047] In some optional embodiments, a cooling plate may also be provided between two adjacent cell assemblies 200 in the first direction Y. The cooling plate makes heat exchange contact with the individual cells 211 of the battery rows 210 on both sides, further increasing the heat dissipation area of ​​the individual cells 211 and effectively improving the heat dissipation effect.

[0048] Optionally, such as Figure 4 As shown, in a cell assembly 200, the inclined portion 221 on the cold plate 220 between two battery rows 210 is inclined toward a preset single cell 2111. The preset single cell 2111 is the single cell 211 closest to the inclined portion 221 in the second direction X among the multiple single cells 211 in the cell assembly 200. When the inlet 222 and the inclined portion 221 are located at opposite ends of the cold plate 220, the preset single cell 2111 is the single cell 211 farthest from the inlet 222 among the multiple single cells 211. When the end of the cold plate 220 where the inlet 222 is located is called the first end, the preset single cell 2111 is the single cell 211 farthest from the end of the cold plate 220. In this way, the heat exchange area between the preset single cell 2111 and the inclined portion 221 can be increased, thereby increasing the heat exchange area between the preset single cell 2111 and the cold plate 220. By increasing the heat exchange area between the cold plate 220 and the preset single cell 2111, the gap between the heat dissipation efficiency of the preset single cell 2111 and the heat dissipation efficiency of other single cells 211 can be shortened, ensuring the consistency of the heat exchange efficiency of multiple single cells 211.

[0049] It should be noted that since the cell 211 furthest from the inclined section 221 in the two battery rows 210 is closer to the inlet 222 of the cold plate 220, and the temperature of the cooling fluid around the inlet 222 of the cold plate 220 is lower, even if the contact area between the cell 211 and the cold plate 220 is small, the large temperature difference can still ensure the heat dissipation efficiency and effect of the cell 211 furthest from the inclined section 221. Therefore, the inclined section 221 does not need to be provided at the end of the cold plate 220 where the inlet 222 is located, thus not increasing the resistance to the flow of cooling fluid in the cold plate 220.

[0050] Optionally, the distance L2 between the projection of the tail-end single cell along the first direction Y on the cold plate 220 and the inclined end of the cold plate 220 along the arrangement direction of the single cells 211 is L2. The value of L2 ranges from 5mm to 20mm. That is, the length L2 of the end of the cold plate 220 with the inclined portion 221 extends beyond the tail-end single cell. This extended length allows the inclined portion 221 to exchange heat with the tail-end single cell through radiation, further ensuring the heat exchange efficiency between the inclined portion 221 and the tail-end single cell. For example, L2 can be 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 12mm, 15mm, 18mm, or 20mm. The distance L2 between the projection of the tail-end single cell along the first direction Y on the cold plate 220 and the inclined end of the cold plate 220 should not be too long, as an excessively long distance would occupy too much space, which is detrimental to improving the energy density of the cylindrical battery device.

[0051] It should be noted that the arrangement direction of the individual cells 211 is the second direction X in this embodiment. The last individual cell along the arrangement direction of the individual cells 211 is the last individual cell 211 in the second direction X in the two battery columns 210. In some embodiments, the last individual cell is the preset individual cell 2111 in this embodiment.

[0052] In some alternative embodiments, such as Figure 6 As shown, the base plate 100 is provided with at least one positioning member 300, which is correspondingly arranged with the cold plate 220 and is used to limit the cold plate 220 to ensure the state of the cold plate 220 and prevent the cold plate 220 from separating from the individual battery 211 due to vibration or other scenarios. This prevents the contact area between the cold plate 220 and each individual battery 211 from decreasing, allowing the cold plate 220 to fit tightly against the outer peripheral surface of each individual battery 211 to ensure efficient heat exchange with the individual battery 211. When multiple positioning members 300 and multiple cold plates 220 are provided, the multiple positioning members 300 correspond one-to-one with the multiple cold plates 220, and each positioning member 300 is used to limit the cold plate 220 corresponding to it to ensure the state of each cold plate 220.

[0053] For example, the positioning member 300 abuts against the inclined portion 221 to limit the movement of the inclined portion 221 away from the preset single cell 2111. Specifically, as Figure 7 As shown, the inclined portion 221 includes a first surface 2212 facing the single cell 211 (specifically, a preset single cell 2111) and a second surface 2213 disposed opposite to the first surface 2212. The positioning member 300 abuts against the second surface 2213 of the corresponding inclined portion 221, allowing the inclined portion 221 to move towards the preset single cell 2111 but preventing it from moving away from it, thus ensuring a large contact area between the cold plate 220 and the preset single cell 2111.

[0054] Optionally, the positioning element 300 can have various specific structures; this embodiment provides one positioning element 300. For example... Figure 7 As shown, the positioning component 300 includes a positioning plate 310 and a reinforcing plate 320 connected together. The positioning plate 310 is connected to the base plate 100 and is used to limit the corresponding cold plate 220. That is, the positioning plate 310 contacts the second surface 2213 of the inclined portion 221. The reinforcing plate 320 is located on the side of the positioning plate 310 away from the corresponding cold plate 220 and is connected to the base plate 100. The setting of the reinforcing plate 320 improves the connection strength between the positioning plate 310 and the base plate 100, so that the positioning plate 310 can better support the inclined portion 221 and ensure the inclination range of the inclined portion 221.

[0055] In some alternative embodiments, the positioning element 300 is integrally formed with the base plate 100. On the one hand, this facilitates the manufacturing of the positioning element 300, eliminating the need to connect each positioning element 300 to the base plate 100 individually. On the other hand, it improves the connection strength between the positioning element 300 and the base plate 100, reduces the probability of the positioning element 300 failing, and improves the reliability of the limiting cold plate 220.

[0056] It is understandable that the positioning component 300 and the base plate 100 can also be separate structures, and this embodiment does not limit this.

[0057] This embodiment also provides a battery pack, including the cylindrical battery device described above. The battery pack provided in this embodiment has high heat dissipation efficiency and thermal safety.

[0058] This embodiment also provides an electrical device, including the cylindrical battery device or the battery pack described above. The electrical device provided in this embodiment has high heat dissipation efficiency and thermal safety.

[0059] For example, electrical equipment includes, but is not limited to: mobile phones, portable devices, laptops, electric vehicles, electric cars, ships, spacecraft, electric toys, and power tools. For instance, spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc.; electric toys include stationary or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys, and electric airplane toys, etc.; and power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers.

[0060] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A cylindrical battery device, characterized in that, Includes a base plate (100) and at least one cell assembly (200) supported on the base plate (100); The cell assembly (200) includes a cold plate (220) and a battery column (210) stacked in a certain direction. The cold plate (220) is disposed on at least one side of the battery column (210), and the extending direction of the cold plate (220) is consistent with the stacking direction of the battery column (210). The cold plate (220) has an inclined portion (221) facing the battery array (210) at at least one end along the extending direction of the cold plate (220). The plane containing the large surface of the inclined portion (221) is set at an angle to the extending direction of the cold plate (220), and the angle is α, wherein 30°≤α≤90°.

2. The cylindrical battery device according to claim 1, characterized in that, The battery cell assembly (200) includes two battery columns (210), the arrangement direction of the two battery columns (210) is perpendicular to the stacking direction of the battery columns (210), and the cold plate (220) is disposed between the two battery columns (210), with 40°≤a≤80°.

3. The cylindrical battery device according to claim 1, characterized in that, The cold plate (220) is provided with an inlet (222) and an outlet (223), the inlet (222) and the outlet (223) are located at the same end of the cold plate (220) along the extension direction of the cold plate (220), and 45°≤a≤90°.

4. The cylindrical battery device according to claim 1, characterized in that, The cold plate (220) is provided with an inlet (222) and an outlet (223), the inlet (222) and the outlet (223) being located at one end of the cold plate (220) away from the inclined portion (221) along the extending direction of the cold plate (220).

5. The cylindrical battery device according to claim 1, characterized in that, The inclined portion (221) has a straight section (2211) with a length ranging from 5mm to 50mm.

6. The cylindrical battery device according to claim 5, characterized in that, The angle between the plane containing the large surface of the inclined portion (221) and the extension direction of the cold plate (220) is the angle between the extension direction of the straight section (2211) and the extension direction of the cold plate (220).

7. The cylindrical battery device according to any one of claims 2-6, characterized in that, The individual cells (211) in the two battery columns (210) of the cell assembly (200) are staggered in a second direction (X); wherein, the second direction (X) is the stacking direction of the battery columns (210); The inclined portion (221) on the cold plate (220) between the two battery rows (210) is inclined toward a preset single cell (2111), which is the single cell (211) in the two battery rows (210) that is closest to the inclined portion (221) in the second direction (X).

8. The cylindrical battery device according to claim 7, characterized in that, The distance between the projection of the tail end single cell along the first direction (Y) on the cold plate (220) and the inclined end of the cold plate (220) along the arrangement direction of the single cell (211) is 5mm-20mm.

9. The cylindrical battery device according to claim 1, characterized in that, The base plate (100) is provided with at least one positioning member (300), which is correspondingly provided with the cold plate (220) and is used to limit the cold plate (220).

10. The cylindrical battery device according to claim 9, characterized in that, The inclined portion (221) includes a first surface (2212) facing the battery pack (210) and a second surface (2213) opposite to the first surface (2212), and the positioning member (300) abuts against the second surface (2213) of the corresponding inclined portion (221).

11. The cylindrical battery device according to claim 9, characterized in that, The positioning component (300) includes a positioning plate (310) and a reinforcing plate (320) connected together. The positioning plate (310) is connected to the base plate (100) and is used to limit the corresponding cold plate (220). The reinforcing plate (320) is located on the side of the positioning plate (310) away from the corresponding cold plate (220) and is connected to the base plate (100).

12. The cylindrical battery device according to claim 9, characterized in that, The positioning component (300) is integrally formed with the base plate (100).

Images