Battery arrangement and battery pack

Abstract

Battery arrangement comprising the following: a plurality of cylindrical batteries (10), each cylindrical battery (10) having a peripheral surface and an end surface; a first cooling plate (20) and a second cooling plate (30), wherein a plate surface of the second cooling plate (30) is perpendicular to a plate surface of the first cooling plate (20) and two second cooling plates (30) are arranged on both sides of the first cooling plate (20), wherein a main surface of the first cooling plate (20) faces the end surface of each of the plurality of cylindrical batteries and is thermally coupled to it, wherein a main surface of the second cooling plate (30) faces the peripheral surface of each of the plurality of cylindrical batteries and is thermally coupled to it, wherein the cylindrical batteries (10) form a cylindrical battery group on a surface of the second cooling plate (30), wherein a first medium flow channel (21) is arranged within the first cooling plate (20) and a second medium flow channel (32) is arranged within the second cooling plate (30); a liquid collecting tube (40) designed to fluidically connect the second medium flow channels (32) of the two second cooling plates (30), wherein the liquid collecting tube (40) is arranged at one end of the second cooling plate (30) in a longitudinal direction and the liquid collecting tube (40) connects two ends of the two second cooling plates (30) on the same side; a liquid inlet (50) and a liquid outlet (60), each arranged on the two second cooling plates (30), wherein the liquid collecting tube (40) is arranged longitudinally at one end of the second cooling plate (30) and the liquid inlet (50) and the liquid outlet (60) are arranged longitudinally at the other end of the second cooling plate (30), wherein the ratio of the length of the second cooling plate (30) in a direction perpendicular to an axis of the cylindrical battery (10) to the width of the second cooling plate (30) in a direction parallel to the axis of the cylindrical battery (10) lies within a range of 4 to 23.

Description

TECHNICAL AREA

[0001] The present application relates to the field of new energy battery technology and in particular to a battery arrangement and a battery pack. BACKGROUND

[0002] A battery pack is a core component of a new energy vehicle. The batteries within the battery pack include prismatic, cylindrical, or bladed batteries, among others. Cylindrical batteries typically use a serpentine cooling plate for cooling due to their cylindrical peripheral surface. However, a serpentine cooling plate can only cool the peripheral surface of a cylindrical battery and cannot achieve good heat dissipation in the axial direction of the battery, resulting in poor overall heat dissipation for cylindrical batteries. SUMMARY

[0003] The technical problem to be solved by the present application is to overcome the deficiency of the poor heat dissipation effect of serpentine cooling plates for cylindrical batteries in the prior art and thereby to provide a battery arrangement and a battery pack.

[0004] To solve the above problem, the present application provides a battery arrangement comprising: a plurality of cylindrical batteries, each cylindrical battery having a peripheral surface and an end surface;a first cooling plate and a second cooling plate, wherein a plate surface of the second cooling plate is perpendicular to a plate surface of the first cooling plate and two second cooling plates are arranged on both sides of the first cooling plate, wherein a main surface of the first cooling plate faces the end surface of each of the plurality of cylindrical batteries and is thermally coupled to it, wherein a main surface of the second cooling plate faces the peripheral surface of each of the plurality of cylindrical batteries and is thermally coupled to it, wherein a plurality of cylindrical batteries on a surface of the second cooling plate form a cylindrical battery group, wherein a first medium flow channel is arranged within the first cooling plate and a second medium flow channel is arranged within the second cooling plate;a liquid collecting tube configured to fluidically connect the second medium flow channels of the two second cooling plates, wherein the liquid collecting tube is arranged longitudinally at one end of the second cooling plate and connects two ends of the two second cooling plates on the same side; a liquid inlet and a liquid outlet, each arranged on the two second cooling plates, wherein the liquid collecting tube is arranged longitudinally at one end of the second cooling plate, the liquid inlet and the liquid outlet are arranged longitudinally at the other end of the second cooling plate, and the ratio of the length of the second cooling plate in a direction perpendicular to an axis of the cylindrical battery to the width of the second cooling plate in a direction parallel to the axis of the cylindrical battery is within a range of 4 to 23.

[0005] The present application offers the following advantages: According to the technical solution of the present application, the battery arrangement uses a combination of the first and second cooling plates to cool the cylindrical batteries. The first cooling plate cools the end faces of the cylindrical batteries, and the second cooling plate cools the peripheral surfaces of the cylindrical batteries, thus ensuring heat dissipation from the cylindrical batteries in both axial and radial directions. By optimizing the relationship between the length and width of the second cooling plate, the temperature difference between the heat exchange medium at the liquid inlet and the heat exchange medium at the liquid outlet can be reduced, thereby ensuring heat exchange at both second cooling plates and reducing uneven heat exchange in the cylindrical batteries.Therefore, the technical solution of the present application eliminates the deficiency of the poor heat dissipation effect of serpentine cooling plates for cylindrical batteries in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] To more clearly illustrate the technical solutions according to the specific embodiments of the present application or in the prior art, the drawings used in the description of the specific embodiments or the prior art are briefly presented below. Obviously, the drawings described below represent some embodiments of the present application, and it is also possible for a person skilled in the art to derive other drawings from these without any creative effort. Fig. Figure 1 shows a schematic graphical structural representation of a battery arrangement of the present application; Fig. Figure 2 shows a schematic graphical representation of a first cooling plate and a second cooling plate of the battery arrangement in Fig. 1. Seen from below; Fig. Figure 3 shows a schematic graphical structural representation of a high-voltage bridging rail of the battery arrangement in Fig. 1; Fig. Figure 4 shows a schematic graphical structural representation of a second medium flow channel of a second cooling plate of the battery arrangement in Fig. 1; Fig. Figure 5 shows a schematic enlarged view of the branch flow channel in Fig. 4; Fig. Figure 6 shows a schematic graphical representation of a first medium flow channel of a first cooling plate of the battery arrangement in Fig. 1; and Fig. Figure 7 shows a schematic graphical structural representation, which depicts one side of a first cooling plate of the battery assembly in Fig. 1 shows. Reference symbol:

[0007] 10 - cylindrical battery; 20 - first cooling plate; 21 - first medium flow channel; 211 - inlet flow channel; 212 - outlet flow channel; 30 - second cooling plate; 31 - arc-shaped recess; 32 - second medium flow channel; 321 - branch flow channel; 40 - liquid collection pipe; 50 - liquid inlet; 60 - liquid outlet; 70 - high-voltage bridging rail; S1 - first area; S2 - second area. DETAILED DESCRIPTION

[0008] The technical solutions of the present application are clearly and completely described in conjunction with the drawings. Obviously, the described embodiments are only a subset of the embodiments of the present application and not all embodiments. Based on the embodiments of the present invention, all other embodiments that could be obtained by those skilled in the art in the field, provided they do not make any creative efforts, are intended to fall within the scope of protection of the present application.

[0009] The description of this application should state that terms such as "middle", "top", "bottom", "left", "right", "vertical", "horizontal", "inner", and "outer", which indicate orientation or positional relationships, are based on the orientation or positional relationships shown in the drawings and serve only to facilitate the description of this application. They do not indicate or imply that the device or element in question must have a specific orientation or be designed or operated in a specific orientation. Therefore, they should not be understood as limitations to this application. Furthermore, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying any relative importance.

[0010] It should be noted that in the description of this application, the terms "attached," "connected," and "coupled" should be understood broadly unless expressly specified and limited otherwise. They can mean, for example, a permanent or detachable connection or a one-piece connection; a mechanical or electrical connection; a direct connection or an indirect connection via intermediate media or the internal communication between two elements. Those skilled in the field can understand the specific meanings of these terms in this application according to the specific situations.

[0011] Moreover, the technical features included in the various embodiments of the present application, which is described below, can be combined with each other as long as they do not conflict with each other.

[0012] As in the Fig. As shown in Figures 1 to 7, an embodiment of the battery arrangement according to the present application comprises a plurality of cylindrical batteries 10, a first cooling plate 20, a second cooling plate 30, a liquid collecting tube 40, a liquid inlet 50, and a liquid outlet 60. The cylindrical battery 10 comprises a peripheral surface and an end surface. The surface of the second cooling plate 30 is perpendicular to the surface of the first cooling plate 20, with two second cooling plates 30 arranged on either side of the first cooling plate 20.The cylindrical batteries 10 are arranged on the second cooling plate 30, wherein the main surface of the first cooling plate 20 faces the end surface of each of the cylindrical batteries and is thermally coupled to it, the main surface of the second cooling plate 30 faces the peripheral surface of each of the cylindrical batteries and is thermally coupled to it, and a plurality of cylindrical batteries 10 on a surface of the second cooling plate 30 form a cylindrical battery group.

[0013] Furthermore, a first medium flow channel 21 is arranged within the first cooling plate 20, while a second medium flow channel 32 is arranged within the second cooling plate 30. The liquid collector pipe 40 is designed to fluidically connect the second medium flow channels 32 of the two second cooling plates 30, with the liquid collector pipe 40 being arranged longitudinally at one end of the second cooling plate 30. The liquid inlet 50 and the liquid outlet 60 are each arranged on the two second cooling plates 30, with the liquid collector pipe 40 being arranged longitudinally at one end of the second cooling plate 30 and the liquid inlet 50 and the liquid outlet 60 being arranged longitudinally at the other end of the second cooling plate 30.

[0014] Furthermore, the ratio of the length of the second cooling plate 30 in a direction perpendicular to an axis of the cylindrical battery 10 to the width of the second cooling plate 30 in a direction parallel to the axis of the cylindrical battery 10 lies within a range of 4 to 23.

[0015] According to the technical solution of this embodiment, the battery arrangement employs a combination of the first cooling plate 20 and the second cooling plate 30 to cool the cylindrical batteries 10. The first cooling plate 20 cools the end faces of the cylindrical batteries 10, while the second cooling plate 30 cools the peripheral surfaces of the cylindrical batteries 10, thus ensuring heat dissipation from the cylindrical batteries 10 in both the axial and radial directions. By optimizing the relationship between the length and width of the second cooling plate 30, the temperature difference between the heat exchange medium of the liquid inlet 50 and the heat exchange medium of the liquid outlet 60 can be reduced, thereby ensuring heat exchange at both second cooling plates 30 and reducing uneven heat exchange within the cylindrical batteries 10.Therefore, the technical solution of this embodiment eliminates the deficiency of the poor heat dissipation effect of a serpentine cooling plate for the cylindrical battery in the prior art.

[0016] As in Fig. Figure 1 shows two groups of battery arrangements connected in parallel. In combination with Fig. Figure 1 shows that cylindrical batteries 10 are arranged on the right side of the battery assembly. To better illustrate the specific structures of the first cooling plate 20 and the second cooling plate 30, no cylindrical batteries 10 are arranged on the left side of the battery assembly.

[0017] According to this embodiment, the cylindrical battery 10 has a cylindrical structure comprising a peripheral surface and two end surfaces, wherein the shape of the cylindrical battery 10 is a cylindrical shape.

[0018] As in Fig. As shown in Figure 2, both the first cooling plate 20 and the second cooling plate 30 have thin plate structures, meaning they both have main surfaces. The first cooling plate 20 is arranged vertically, meaning its main surface faces horizontally, and it has a height and a length. The second cooling plate 30 is arranged horizontally, meaning its main surface faces vertically, and it has a longitudinal and a transverse direction. The second cooling plates 30 are arranged on both sides of the first cooling plate 20; therefore, one first cooling plate 20 and two second cooling plates 30 form a "cross-shaped" structure. That is, the plate surface of the first cooling plate 20 and the plate surface of the second cooling plate 30 are perpendicular to each other.

[0019] As in connection with Fig. As can be seen in Figure 2, the cross-section of the second cooling plate 30 has a wavy shape, i.e., several spaced arc-shaped recesses 31 are formed in both the upper and lower main surfaces of the second cooling plate 30, with the arc-shaped recesses 31 extending along the longitudinal direction of the first cooling plate 20.

[0020] As from Fig. As can be seen in Figure 1, the cylindrical batteries 10 are placed on the second cooling plate 30, with the axis of the cylindrical battery 10 extending along the width direction of the second cooling plate 30. This means that the peripheral surface of the cylindrical battery 10 is thermally coupled to the arc-shaped recess 31. The end surface of the cylindrical battery 10 is thermally coupled to the main surface of the first cooling plate 20. That is, the first cooling plate 20 performs heat exchange with the end surface of the cylindrical battery 10, while the second cooling plate 30 performs heat exchange with the peripheral surface of the cylindrical battery 10.

[0021] It should be noted that the expression "the main surface of the first cooling plate 20 faces the end surface of the cylindrical battery and is thermally coupled to it" means that the end surface of the cylindrical battery can exchange heat with the main surface of the first cooling plate 20, including direct or indirect contact between the end surface of the cylindrical battery and the main surface of the first cooling plate 20. According to this embodiment, the end surface of the cylindrical battery is attached to the main surface of the first cooling plate 20 via an adhesive (indirect contact).

[0022] It should be noted that the expression "the main surface of the second cooling plate 30 faces the peripheral surface of the cylindrical battery and is thermally coupled to it" means that the peripheral surface of the cylindrical battery can exchange heat with the main surface of the second cooling plate 30, including direct or indirect contact between the main surface of the second cooling plate 30 and the peripheral surface of the cylindrical battery. According to this embodiment, the peripheral surface of the cylindrical battery is attached to the main surface of the second cooling plate 30 via an adhesive (indirect contact).

[0023] Furthermore, one of the two second cooling plates 30 is provided with a liquid inlet 50, while the other is provided with a liquid outlet 60, with both the liquid inlet 50 and the liquid outlet 60 being located on one side of the second cooling plates 30, namely the left side. Fig. 1. The liquid collecting tube 40 is located on another side of the second cooling plate 30, which is opposite the liquid inlet 50 and the liquid outlet 60, namely the right side in Fig. 1. The liquid collection tube 40 has a strip-like structure and covers the outside of the ends of the two second cooling plates 30. A flow channel is provided inside the liquid collection tube 40, wherein the liquid collection tube 40 can fluidically connect the second medium flow channels 32 of the two second cooling plates 30.

[0024] Therefore, the flow mode of the heat exchange medium in the two second cooling plates 30 is as follows: entry through the liquid inlet 50, flow to the second medium flow channel 32 of one second cooling plate 30, flow to the liquid collector pipe 40 and then to the second medium flow channel 32 of the other second cooling plate 30, and exit from the liquid outlet 60. Those skilled in the art can recognize that the flow direction of the heat exchange medium forms approximately a "U"-shaped path.

[0025] Furthermore, the flow path of the heat exchange medium is relatively long, with the heat exchange medium continuously exchanging heat with the cylindrical batteries 10 during its flow. Therefore, the heat exchange capacity of the heat exchange medium is better near the liquid inlet 50 than near the liquid outlet 60. If a cooling fluid is used as an example to cool the cylindrical batteries 10, the temperature of the heat exchange medium near the liquid inlet 50 is lower than near the liquid outlet 60. This can lead to uneven heat exchange for the multiple cylindrical batteries 10, necessitating further optimization of the above structure.

[0026] Specifically, the length of the second cooling plate 30 cannot be too long; if the length of the second cooling plate 30 is too long, this causes an increase in the flow path of the heat exchange medium, an increase in the temperature difference between the upstream and downstream heat exchange medium, and a further deterioration of the uneven heat exchange for the plurality of cylindrical batteries 10.

[0027] Furthermore, the width of the second cooling plate 30 cannot be too small, since the width of the second cooling plate 30 determines the cross-sectional area and the flow velocity (or flow rate) of the heat exchange medium in the second medium flow channel 32.

[0028] Regarding the length-to-width ratio of the second cooling plate 30, this ratio cannot be too small, as a ratio that is too small would result in a shorter length for the second cooling plate 30. If it is desired to keep the first cooling plate 20 as small as possible, the cylindrical batteries 10 would have to be arranged in a direction perpendicular to the longitudinal direction of the battery pack, which would increase the number of high-voltage transition components between the cylindrical battery groups and consequently would not be conducive to ensuring the reliability of the battery pack.

[0029] Optionally, the ratio of the length to the width of the second cooling plate 30 is within a range of 4 to 23.

[0030] The ratio of the length to the width of the second cooling plate 30 can be selected from 4, 10, 15, 20 or 23, for example.

[0031] Preferably, the ratio of the length to the width of the second cooling plate 30 lies within a range of 4.5 to 11.4.

[0032] The ratio of the length to the width of the second cooling plate 30 can be selected from 4.5, 5, 10, 11 or 11.4, for example.

[0033] As in Fig. As shown in Figure 3, according to the technical solution of this embodiment, the battery arrangement also includes a high-voltage bridging rail 70, wherein the high-voltage bridging rail 70 is configured to connect different cylindrical battery groups or to carry electrical energy out of the cylindrical battery group. The high-voltage bridging rail 70 is arranged on the second cooling plate 30 and is located on the side of the second cooling plate 30 that is opposite the liquid inlet 50 and the liquid outlet 60.

[0034] That is, the high-voltage bridging rail 70 is arranged on the second cooling plate 30 and is located on the side of the second cooling plate 30 on which the liquid collecting tube 40 is arranged.

[0035] According to this embodiment, the water channel and the electrical circuit are separated to ensure the safe use of the battery assembly.

[0036] According to the technical solution of this embodiment, the ratio of the width of the second medium flow channel 32 to the width of the liquid collecting pipe 40 lies within a range of 0.0003 to 8.

[0037] If the ratio of the width of the second medium flow channel 32 to the width of the liquid collection pipe 40 is too large, it specifically indicates that the width of the second medium flow channel 32 is relatively large and the width of the liquid collection pipe 40 is relatively small, resulting in a relatively high flow resistance of the heat exchange medium at the liquid collection pipe 40, which increases the degree of turbulence. An increased degree of turbulence is detrimental to the temperature uniformity of the heat exchange medium at the liquid inlet 50 and the liquid outlet 60.If the ratio of the width of the second medium flow channel 32 to the width of the liquid collection pipe 40 is too small, this indicates that the width of the second medium flow channel 32 is relatively small and the width of the liquid collection pipe 40 is relatively large, whereby a small width of the second medium flow channel 32 is also unfavorable for reducing the flow resistance of the heat exchange medium.

[0038] Optionally, the ratio of the width of the second medium flow channel 32 to the width of the liquid collection pipe 40 can be selected from 0.0003, 0.001, 0.01, 0.1, 1, 5 or 8.

[0039] Preferably, the ratio of the width of the second medium flow channel 32 to the width of the liquid collecting pipe 40 lies within a range of 0.025 to 1.

[0040] Optionally, the ratio of the width of the second medium flow channel 32 to the width of the liquid collection pipe 40 can be selected from 0.03, 0.04, 0.1, 0.5, 0.7, 0.9 or 1.

[0041] According to this embodiment, the width of the liquid collecting tube 40 lies within a range of 3 mm to 70 mm.

[0042] Optionally, the width of the liquid collection pipe 40 can be selected from 3 mm, 5 mm, 10 mm, 20 mm, 40 mm, 60 mm or 70 mm, etc.

[0043] As in Fig. As shown in Figure 2, according to the technical solution of this embodiment, the width of the second cooling plate 30 in a direction parallel to the axis of the cylindrical battery 10 lies within a range of 70 mm to 131 mm.

[0044] Optionally, the width of the second cooling plate 30 in a direction parallel to the axis of the cylindrical battery 10 can be 70 mm, 80 mm, 90 mm, 100 mm, 110 mm, 120 mm, 130 mm or 131 mm.

[0045] Preferably, the width of the second cooling plate 30 lies in the direction parallel to the axis of the cylindrical battery 10 within a range of 90 mm to 121 mm.

[0046] Optionally, the width of the second cooling plate 30 in the direction parallel to the axis of the cylindrical battery 10 can be 90 mm, 100 mm, 110 mm, 120 mm or 121 mm.

[0047] As in the Fig. 4 and Fig. As shown in Figure 5, according to the technical solution of this embodiment, the widths of the two second cooling plates 30 in the direction parallel to the axis of the cylindrical battery 10 are the same, wherein the second medium flow channel 32 contains a plurality of branch flow channels 321.

[0048] Specifically, the branch flow channel 321 extends along the longitudinal direction of the second cooling plate 30, wherein the multiple branch flow channels 321 are arranged parallel along the width direction of the second cooling plate 30.

[0049] The aforementioned width of the second medium flow channel 32 refers to the width of a single branch flow channel 321. If the widths of the multiple branch flow channels 321 are different, the width of the second medium flow channel 32 additionally refers to the width of the branch flow channel 321 with the smallest width among the multiple branch flow channels 321.

[0050] According to the technical solution of this embodiment, the number of branch flow channels 321 of the second cooling plate 30 connected to the liquid outlet 60 is less than the number of branch flow channels 321 of the second cooling plate 30 connected to the liquid inlet 50.

[0051] If the widths of the two second cooling plates 30 are the same, the flow rate of the heat exchange medium is specifically greater and the convective heat transfer capacity of the heat exchange medium is stronger the smaller the number of flow channels 321 is.By making the number of branch flow channels 321 of the second cooling plate 30 connected to the liquid outlet 60 smaller than the number of branch flow channels 321 of the second cooling plate 30 connected to the liquid inlet 50, the convective heat transfer capacity of the heat exchange medium at the liquid outlet 60 can be made greater than the convective heat transfer capacity of the heat exchange medium at the liquid inlet 50, thereby compensating for the insufficient heat exchange after the heat exchange medium has traveled a certain distance, so that the temperature of the respective cylindrical batteries 10 in the battery pack is more uniform.

[0052] According to the technical solution of this embodiment, the ratio of the number of branch flow channels 321 of the second cooling plate 30 connected to the liquid outlet 60 to the number of branch flow channels 321 of the second cooling plate 30 connected to the liquid inlet 50 is within a range of 0.026 to 1.

[0053] Optionally, this ratio can be selected from 0.026, 0.03, 0.05, 0.1, 0.5 or 1.

[0054] Preferably, the ratio of the number of branch flow channels 321 of the second cooling plate 30 connected to the liquid outlet 60 to the number of branch flow channels 321 of the second cooling plate 30 connected to the liquid inlet 50 is within a range of 0.5 to 0.8.

[0055] Optionally, this ratio can be selected from 0.5, 0.6, 0.7 or 0.8.

[0056] As in Fig. As shown in Figure 6, according to the technical solution of this embodiment, the first medium flow channel 21 includes an inlet flow channel 211 and an outlet flow channel 212, wherein the inlet flow channel 211 and the outlet flow channel 212 divide the main area of ​​the first cooling plate 20 into a first area S1 and a second area S2, and the projection of the second cooling plate 30 onto the main area of ​​the first cooling plate 20 is located within the first area S1.

[0057] Specifically, the inlet flow channel 211 and the outlet flow channel 212 also contain a plurality of branch flow channels, the respective branch flow channels being arranged parallel along the longitudinal direction of the first cooling plate 20.

[0058] According to this embodiment, the side of the first cooling plate 20 is also provided with a liquid inlet and a liquid outlet, wherein this liquid inlet and the liquid outlet are arranged on the same side of the first cooling plate 20 as the liquid inlet 50 and the liquid outlet 60 of the second cooling plate 30, the liquid inlet and the liquid outlet of the first cooling plate 20 being arranged along the vertical direction of the first cooling plate 20. The liquid inlet of the first cooling plate 20 is fluidically connected to the inlet flow channel 211, the liquid outlet of the first cooling plate 20 is fluidically connected to the outlet flow channel 212, and the inlet flow channel 211 and the outlet flow channel 212 are fluidically connected on the other side of the first cooling plate 20 (i.e., the side on which the liquid collection tube 40 is arranged).

[0059] Furthermore, the aforementioned inlet flow channel 211 refers to the channel through which the heat exchange medium enters the inlet flow channel 211 from the liquid inlet and flows along the inlet flow channel 211 in a direction away from the liquid inlet and liquid outlet of the first cooling plate 20. The aforementioned outlet flow channel 212 refers to the channel from which the heat exchange medium can flow from the outlet flow channel 212 to the liquid outlet to be drained, with the heat exchange medium flowing along the outlet flow channel 212 in a direction towards the liquid inlet and liquid outlet of the first cooling plate 20.

[0060] This means that the flow path of the heat exchange medium in the inlet flow channel 211 and the outlet flow channel 212 forms an approximately "U"-shaped trajectory.

[0061] As from Fig. As can be seen in Figure 7, the section of the main surface of the first cooling plate 20, which corresponds to the inlet flow channel 211, forms the first area S1, which is the area above the dashed line in Fig. 7 is. The section of the main surface of the first cooling plate 20, which corresponds to the outlet flow channel 212, forms the second area S2, which is the area below the dashed line in Fig. 7 is.

[0062] As mentioned above, the flow path of the heat exchange medium within the first cooling plate 20 also forms an approximately "U"-shaped structure. As mentioned above, there is also a case in the first cooling plate 20 where the heat exchange capacity of the heat exchange medium in the inlet flow channel 211 is higher than the heat exchange capacity of the heat exchange medium in the outlet flow channel 212.

[0063] If the second cooling plate 30 is arranged at the interface between the first region S1 and the second region S2 of the main surface of the first cooling plate 20, this would cause the cylindrical batteries 10, which are arranged above the second cooling plate 30, to only be able to come into contact with the heat exchange medium with high heat exchange capacity, while the cylindrical batteries 10, which are arranged below the second cooling plate 30, could only come into contact with the heat exchange medium with low heat exchange capacity, which would lead to an unbalanced temperature between the cylindrical batteries 10 on the top and bottom of the second cooling plate 30.

[0064] Therefore, according to the technical solution of this embodiment, the projection of the second cooling plate 30 onto the main surface of the first cooling plate 20 is located within the first area S1. This allows the cylindrical batteries 10, which are arranged above the second cooling plate 30, to come into contact with the heat exchange medium with high thermal exchange capacity, and allows the cylindrical batteries 10, which are arranged below the second cooling plate 30, to come into contact with a portion of the heat exchange medium with high thermal exchange capacity, which consequently makes the temperatures of the respective cylindrical batteries 10 in the battery pack more uniform.

[0065] Optionally, the distance between the lower edge of the projection of the second cooling plate 30 onto the main surface of the first cooling plate 20 and the interface between the first area S1 and the second area S2 lies within a range of 0.05 mm to 0.5 mm.

[0066] This distance can be, for example, 0.05 mm, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm or 0.5 mm.

[0067] Preferably, the distance between the lower edge of the projection of the second cooling plate 30 onto the main surface of the first cooling plate 20 and the interface between the first area S1 and the second area S2 lies within a range of 0.1 mm to 0.3 mm.

[0068] This distance can be, for example, 0.1 mm, 0.2 mm or 0.3 mm.

[0069] Optionally, the total cross-sectional area of ​​the inlet flow channel 211 is larger than the total cross-sectional area of ​​the outlet flow channel 212.

[0070] As from Fig.As can be seen in Figure 7, along the vertical direction of the first cooling plate 20, the height of the area S1 (i.e., the size of the area S1 along the vertical direction of the first cooling plate 20) is slightly greater than the height of the area S2 (i.e., the size of the area S2 along the vertical direction of the first cooling plate 20), and therefore the total cross-sectional area of ​​the inlet channel 211 (the sum of the cross-sectional areas of the respective branch flow channels) is greater than the total cross-sectional area of ​​the outlet flow channel 212 (the sum of the cross-sectional areas of the respective branch flow channels).This allows the cylindrical batteries 10, which are arranged above the second cooling plate 30, to come into contact with the heat exchange medium with high heat exchange capacity in the inlet flow channel 211, and allows the cylindrical batteries 10, which are arranged below the second cooling plate 30, to come into contact with a part of the heat exchange medium with high heat exchange capacity in the inlet flow channel 211, which consequently makes the temperatures of the cylindrical batteries 10 in the battery pack more uniform.

[0071] According to the technical solution of this embodiment, on one side of the first cooling plate 20, the area of ​​the main surface of the first cooling plate 20, the area of ​​the main surface of the second cooling plate 30 and the size of the cylindrical battery 10 satisfy the following relationship: The value of (A / (B * n)) / (C / (D * n)) lies in a range from 0.013 to 14.8, where A represents the area of ​​the main surface of the first cooling plate 20, B represents the area of ​​the end surface of the cylindrical battery 10, C represents the area of ​​the main surface of the second cooling plate 30, D represents the area of ​​the peripheral surface of the cylindrical battery 10, and n represents the number of cylindrical batteries 10 on one side of the first cooling plate (20).

[0072] The numerator (A / (B * n)) represents the area of ​​the first cooling plate 20 for cooling in the axial direction, which is assigned to each cylindrical battery 10, while the denominator (C / (D * n)) represents the area of ​​the second cooling plate 30 for cooling in the radial direction, which is assigned to each cylindrical battery 10.

[0073] Considering that the heat transfer efficiency in the axial direction and the heat transfer efficiency in the radial direction of the cylindrical battery 10 are different, the above ratio should be within a reasonable range to balance the heat transfer efficiency in the two directions.

[0074] Optionally, this ratio can be 0.013, 0.02, 0.1, 1, 5, 10, 14 or 14.8.

[0075] Preferably, this ratio lies within a range of 0.8 to 4.

[0076] This ratio can be, for example, 0.8, 1, 2, 3 or 4.

[0077] The present application also provides a battery pack comprising a housing and a battery assembly arranged within the housing. The battery assembly is the aforementioned battery assembly; the housing includes a base plate, the first cooling plate is perpendicular to the base plate, and the second cooling plate is parallel to the base plate.

[0078] Obviously, the embodiments described above are merely examples for illustrative purposes and do not represent limitations on the implementations. A person skilled in the art could easily imagine other various modifications or variations based on the above description. There is neither the need nor the possibility to list all possible implementation modes here. Nevertheless, any obvious modifications or variations derived therefrom are within the scope of protection of the present invention.

Claims

[1] Battery arrangement comprising the following: a plurality of cylindrical batteries (10), each cylindrical battery (10) having a peripheral surface and an end surface; a first cooling plate (20) and a second cooling plate (30), wherein a plate surface of the second cooling plate (30) is perpendicular to a plate surface of the first cooling plate (20) and two second cooling plates (30) are arranged on both sides of the first cooling plate (20), wherein a main surface of the first cooling plate (20) faces the end surface of each of the plurality of cylindrical batteries and is thermally coupled to it, wherein a main surface of the second cooling plate (30) faces the peripheral surface of each of the plurality of cylindrical batteries and is thermally coupled to it, wherein the cylindrical batteries (10) form a cylindrical battery group on a surface of the second cooling plate (30), wherein a first medium flow channel (21) is arranged within the first cooling plate (20) and a second medium flow channel (32) is arranged within the second cooling plate (30); a liquid collecting tube (40) designed to fluidically connect the second medium flow channels (32) of the two second cooling plates (30), wherein the liquid collecting tube (40) is arranged at one end of the second cooling plate (30) in a longitudinal direction and the liquid collecting tube (40) connects two ends of the two second cooling plates (30) on the same side; a liquid inlet (50) and a liquid outlet (60), each arranged on the two second cooling plates (30), wherein the liquid collecting tube (40) is arranged longitudinally at one end of the second cooling plate (30) and the liquid inlet (50) and the liquid outlet (60) are arranged longitudinally at the other end of the second cooling plate (30), wherein the ratio of the length of the second cooling plate (30) in a direction perpendicular to an axis of the cylindrical battery (10) to the width of the second cooling plate (30) in a direction parallel to the axis of the cylindrical battery (10) lies within a range of 4 to 23. [2] Battery arrangement according to claim 1, wherein the battery arrangement further comprises a high-voltage bridging rail (70), and wherein the high-voltage bridging rail (70) is configured to connect different cylindrical battery groups or to carry out electrical energy from the cylindrical battery group, and the high-voltage bridging rail (70) is arranged on the second cooling plate (30) and is located on another side of the second cooling plate (30) opposite the liquid inlet (50) and the liquid outlet (60). [3] Battery arrangement according to claim 1 or 2, wherein the ratio of the width of the second medium flow channel (32) to the width of the liquid collection tube (40) is within a range of 0.0003 to 8. [4] Battery arrangement according to one of claims 1 to 3, wherein the width of the second cooling plate (30) in the direction parallel to the axis of the cylindrical battery (10) is in a range of 70 mm to 131 mm. [5] Battery arrangement according to one of claims 1 to 4, wherein the widths of the two second cooling plates (30) are equal in the direction parallel to the axis of the cylindrical battery (10), the second medium flow channel (32) has a plurality of branch flow channels (321) and the number of branch flow channels (321) of the second cooling plate (30) connected to the liquid outlet (60) is less than the number of branch flow channels (321) of the second cooling plate (30) connected to the liquid inlet (50). [6] Battery arrangement according to claim 5, wherein the ratio of the number of branch flow channels (321) of the second cooling plate (30) connected to the liquid outlet (60) to the number of branch flow channels (321) of the second cooling plate (30) connected to the liquid inlet (50) is within a range of 0.026 to 1. [7] Battery arrangement according to claim 5 or 6, wherein the first medium flow channel (21) has an inlet flow channel (211) and an outlet flow channel (212), the inlet flow channel (211) and the outlet flow channel (212) divide the main area of ​​the first cooling plate (20) into a first area (S1) and a second area (S2), and a projection of the second cooling plate (30) onto a side surface of the first cooling plate (20) is located within the first area (S1). [8] Battery arrangement according to claim 7, wherein a distance between a lower edge of a projection of the second cooling plate (30) onto the main surface of the first cooling plate (20) and an interface between the first area (S1) and the second area (S2) is within a range of 0.05 mm to 0.5 mm. [9] Battery arrangement according to claim 7 or 8, wherein the total cross-sectional area of ​​the inlet flow channel (211) is larger than the total cross-sectional area of ​​the outlet flow channel (212). [10] Battery arrangement according to one of claims 7 to 9, wherein on one side of the first cooling plate (20) an area of ​​the main surface of the first cooling plate (20), an area of ​​the main surface of the second cooling plate (30) and a size of the cylindrical battery (10) satisfy the following relationship: A value of (A / (B * n)) / (C / (D * n)) lies within a range of 0.013 to 14.8, where A represents the area of ​​the main surface of the first cooling plate (20), B represents the area of ​​the end surface of the cylindrical battery (10), C represents the area of ​​the main surface of the second cooling plate (30), D represents the area of ​​the peripheral surface of the cylindrical battery (10), and n is the number of cylindrical batteries (10) on one side of the first cooling plate (20). [11] Battery pack comprising a housing and a battery arrangement arranged in the housing, wherein the battery arrangement is the battery arrangement according to any one of claims 1 to 10, the housing has a base plate and the second cooling plate is arranged parallel to the base plate.

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