Box body applied to battery pack, battery pack and energy storage system

Abstract

The embodiment of the invention relates to the field of energy storage, and provides a box body applied to a battery pack, the battery pack and an energy storage system.The box body comprises a liquid cooling flow channel arranged in the box body, and the liquid cooling flow channel comprises a liquid inlet area, a liquid outlet area and a steering area communicating the liquid inlet area with the liquid outlet area; the flow dividing pieces are arranged in the liquid inlet area, the liquid outlet area and the steering area in a penetrating manner; in the first direction, the first width of the liquid inlet area is smaller than the second width of the liquid outlet area; the steering area comprises a first area and a second area, the first area directly faces the liquid inlet area in the second direction, and the second area directly faces the liquid outlet area in the second direction; the liquid outlet area comprises a third area and a fourth area, the third area directly faces the liquid inlet area in the first direction, the fourth area directly faces the steering area in the first direction, and in the second direction, the width of the first area is larger than that of the second area. The embodiment of the invention is at least beneficial to integrating the liquid cooling flow channel in the box body, and is beneficial to improving the cooling performance of the box body.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application is a divisional application of the Chinese invention patent application with the application date of May 16, 2024, application number 202410611933.8, and invention name “Casing, battery pack and energy storage system for battery pack”. Technical Field

[0003] The embodiments of the present disclosure relate to the field of energy storage, and in particular to a box used for a battery pack, a battery pack, and an energy storage system. Background Art

[0004] In current liquid cooling technology, the most common liquid cooling method is to arrange the liquid cooling plate or liquid cooling tube inside the box and install it independently from the module and the box. The liquid cooling plate is mostly formed by aluminum alloy extrusion process. After the liquid cooling plate extrude the flow channel, it is welded to form the liquid cooling flow channel. Since the air tightness at the welding position of the liquid cooling flow channel is difficult to control, the air tightness yield is very low, thereby reducing the cooling performance of the liquid cooling plate.

[0005] In addition, the liquid cooling plate separately arranged in the battery pack occupies a large amount of space, increases the weight of the battery pack, and thus causes a decrease in the energy density of the battery pack. Summary of the invention

[0006] The embodiments of the present disclosure provide a box body, a battery pack and an energy storage system applied to a battery pack, which are at least conducive to integrating a liquid cooling channel into the box body and are conducive to improving the cooling performance of the box body.

[0007] According to some embodiments of the present disclosure, on the one hand, an embodiment of the present disclosure provides a box body applied to a battery pack, comprising: a liquid cooling channel arranged inside the box body, the liquid cooling channel comprising a liquid inlet area, a liquid outlet area and a turning area connecting the liquid inlet area and the liquid outlet area; a plurality of diverter parts, interspersed and arranged in the liquid inlet area, the liquid outlet area and the turning area; wherein, along the first direction, the first width of the liquid inlet area is smaller than the second width of the liquid outlet area, and the first direction is the width direction of the box body; the turning area comprises a first area and a second area, the first area is opposite to the liquid inlet area along the second direction, and the second area is opposite to the liquid outlet area along the second direction, and the second direction is the length direction of the box body; the liquid outlet area comprises a third area and a fourth area, the third area is opposite to the liquid inlet area along the first direction, the fourth area is opposite to the turning area along the first direction, and in the second direction, the width of the first area is greater than the width of the second area.

[0008] In some embodiments, the diverter arranged in the liquid inlet area is a first diverter, the diverter arranged in the turning area is a second diverter, and the diverter arranged in the liquid outlet area is a third diverter; along the second direction, the maximum length of the first diverter is a first length, the maximum length of the second diverter is a second length, and the maximum length of the third diverter is a third length, the third length is greater than the first length, and the third length is greater than the second length, the first length is greater than the second length of at least a part of the second diverters, and the second direction is the length direction of the box.

[0009] In some embodiments, the path through which the coolant continuously circulates in the liquid inlet area is a first path, the path through which the coolant continuously circulates in the turning area is a second path, and the path through which the coolant continuously circulates in the liquid outlet area is a third path, and the third path is larger than the first path, and the third path is larger than the second path.

[0010] In some embodiments, the diverter arranged in the liquid inlet area is a first diverter; a number of the first diverter members include N groups of first diverter member groups arranged at intervals along the first direction, and any first diverter member group includes multiple first diverter members arranged at intervals along the second direction, and N is a positive integer greater than or equal to 2; wherein, along the first direction, the width of the first diverter member in the Nth group of the first diverter member group is greater than or equal to the width of the first diverter member in the (N-1)th group of the first diverter member group; or, along the second direction, the length of any first diverter member in the Nth group of the first diverter member group is greater than or equal to the length of at least one first diverter member in the (N-1)th group of the first diverter member group.

[0011] In some embodiments, the diverter arranged in the liquid outlet area is a third diverter; partial areas of a portion of the third diverter are also arranged in the turning area; the third diverter includes at least a first diverter portion, the first diverter portion includes a first baffle portion located in the turning area and a first guide portion located in the liquid outlet area, the first guide portion encloses a first groove, and along the second direction, the first groove extends in a direction close to the turning area.

[0012] In some embodiments, the third diverter also includes a second diverter portion, the second diverter portion includes a second baffle portion located in the turning zone, and a second guide portion and a third guide portion that are in contact and connected with different areas of the second baffle portion along the first direction, the second guide portion, the third guide portion and the second baffle portion located between the second guide portion and the third guide portion together form a second groove, and along the second direction, the second groove extends in a direction away from the turning zone.

[0013] In some embodiments, a portion of the second baffle is located in the turning area, and a remaining portion is located in the liquid outlet area.

[0014] In some embodiments, the third diverter also includes a third diverter portion and a fourth diverter portion, the third diverter portion is located between the first diverter portion and the second diverter portion, the third diverter portion is an S-shaped structure, one end of the third diverter portion is opposite to the first groove along the second direction, the other end of the third diverter portion is opposite to the second groove along the second direction, and the third diverter portion forms two third grooves; one of the fourth diverters is located between the first diverter portion and the third diverter portion, and the other fourth diverter portion is located between the second diverter portion and the third diverter portion, wherein the fourth diverter portion is a Z-shaped structure, one end of the fourth diverter portion is located in the first groove or the second groove, and the other end of the fourth diverter portion is located in the third groove.

[0015] According to some embodiments of the present disclosure, another aspect of the embodiments of the present disclosure further provides a battery pack, comprising: a box body as described in any one of the above items.

[0016] According to some embodiments of the present disclosure, on the other hand, an energy storage system is provided, comprising: a box as described in any one of the above items, or a battery pack as described in any one of the above items.

[0017] The technical solution provided by the embodiments of the present disclosure has at least the following advantages:

[0018] On the one hand, the liquid cooling channel is roughly divided into a liquid inlet area, a liquid outlet area and a turning area, so that the flow path of the coolant entering the housing is roughly C-shaped, reducing the number of turns in the coolant flow path to minimize the total length of the coolant flow path in the housing to ensure that the coolant has a high flow velocity in the liquid cooling channel and that the coolant has a high cooling performance; on the other hand, diverters are provided in the liquid inlet area, the liquid outlet area and the turning area, and the diverters are used to increase the flow velocity of the coolant in the liquid cooling channel to improve the cooling performance of the coolant by utilizing the disturbing effect of the diverters on the coolant. The increase in the coolant flow velocity is beneficial to preventing impurities in the coolant from being deposited in the liquid cooling channel, thereby helping to increase the service life of the housing.

[0019] Moreover, the first width of the liquid inlet area is designed to be smaller than the second width of the liquid outlet area, which is beneficial to make the volume of the liquid inlet area mainly used to promote the coolant to flow into the liquid-cooling flow channel smaller than the volume of the liquid outlet area mainly used to promote the coolant to flow out of the liquid-cooling flow channel, thereby facilitating the flow rate of the coolant just entering the liquid-cooling flow channel by limiting the activity space of the coolant flowing into the liquid-cooling flow channel. After the coolant flows into the liquid outlet area, the flow rate of the coolant can be slowly reduced by virtue of the larger volume of the liquid outlet area, and the time for the coolant to stay in the liquid outlet area is increased, so as to further improve the cooling performance of the coolant;

[0020] In addition, the turning zone is designed to include a first zone and a second zone, and the liquid outlet zone includes a third zone and a fourth zone, and in the second direction, the width of the first zone is greater than the width of the second zone, which is beneficial to reserving more layout space in the box for the liquid outlet zone, which is used to layout the specific flow direction of the liquid cooling channel to adjust the flow rate of the coolant in the liquid outlet zone. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] One or more embodiments are exemplarily illustrated by pictures in the corresponding drawings, which do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements, and the figures in the drawings do not constitute a scale limitation unless otherwise stated. In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the traditional technology, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 A schematic diagram of a first partial top view of a box provided in an embodiment of the present disclosure;

[0023] Figure 2 A schematic diagram of a second partial top view of the box provided in one embodiment of the present disclosure;

[0024] Figure 3 A schematic diagram of a third partial top view of the box provided in one embodiment of the present disclosure;

[0025] Figure 4 A schematic diagram of a top view of the structure of a liquid inlet area of ​​a liquid cooling channel in a box provided in an embodiment of the present disclosure;

[0026] Figure 5 A partial top view structural schematic diagram of a turning area and a liquid outlet area of ​​a liquid cooling channel in a box provided in an embodiment of the present disclosure;

[0027] Figure 6 A schematic diagram of a top view of the structure of a first diversion portion in a box provided in an embodiment of the present disclosure;

[0028] Figure 7 A schematic diagram of a top view of the structure of a second diversion portion in a box provided in an embodiment of the present disclosure;

[0029] Figure 8 A schematic diagram of a top view of the structure of a third diverter in a box provided in an embodiment of the present disclosure;

[0030] Fig. 9 A schematic diagram of a partial three-dimensional structure of a battery pack provided in another embodiment of the present disclosure;

[0031] Fig.10 Another partial three-dimensional structural schematic diagram of a battery pack provided in another embodiment of the present disclosure. DETAILED DESCRIPTION

[0032] As can be seen from the background technology, the cooling performance of the liquid cooling plate needs to be improved.

[0033] The present disclosure provides a case, a battery pack and an energy storage system for a battery pack. In the case, on the one hand, the liquid cooling channel is roughly divided into a liquid inlet area, a liquid outlet area and a turning area, so that the flow path of the coolant entering the case is roughly C-shaped, and the number of turns of the coolant flow path is reduced to minimize the total length of the coolant flow path in the case to ensure that the coolant has a high flow rate in the liquid cooling channel and a high cooling performance. On the other hand, diverters are provided in the liquid inlet area, the liquid outlet area and the turning area, and the diverters are used to disturb the coolant to increase the flow rate of the coolant in the liquid cooling channel to improve the cooling performance of the coolant. The increase in the coolant flow rate is beneficial to avoiding the deposition of impurities in the coolant in the liquid cooling channel, thereby helping to increase the service life of the case. Moreover, the first width of the liquid inlet area is designed to be smaller than the second width of the liquid outlet area, which is beneficial for making the volume of the liquid inlet area, which is mainly used to promote the coolant to flow into the liquid-cooling channel, smaller than the volume of the liquid outlet area, which is mainly used to promote the coolant to flow out of the liquid-cooling channel. This is beneficial for limiting the activity space for the coolant to flow into the liquid-cooling channel to increase the flow rate of the coolant just entering the liquid-cooling channel. After the coolant flows into the liquid outlet area, the larger volume of the liquid outlet area can slowly reduce the flow rate of the coolant, increase the time the coolant stays in the liquid outlet area, and further improve the cooling performance of the coolant; in addition, the turning area is designed to include the first area and the second area, and the liquid outlet area includes the third area and the fourth area, and in the second direction, the width of the first area is greater than the width of the second area, which is beneficial for reserving more layout space in the box for the liquid outlet area, which is used to layout the specific flow direction of the liquid cooling channel to adjust the flow rate of the coolant located in the liquid outlet area.

[0034] The following will describe the various embodiments of the present disclosure in detail with reference to the accompanying drawings. However, it will be appreciated by those skilled in the art that in the various embodiments of the present disclosure, many technical details are provided in order to enable the reader to better understand the embodiments of the present disclosure. However, even without these technical details and various changes and modifications based on the following embodiments, the technical solutions claimed in the embodiments of the present disclosure can be implemented.

[0035] An embodiment of the present disclosure provides a box body, which will be described in detail below with reference to the accompanying drawings.

[0036] Combined with reference Figures 1 to 3 The box body 101 is applied to a battery pack, and the box body 101 includes: a liquid cooling channel 102 arranged inside the box body 101, and the liquid cooling channel 102 includes a liquid inlet area 112, a liquid outlet area 132 and a turning area 122 connecting the liquid inlet area 112 and the liquid outlet area 132; a plurality of diverter members 103 are interspersed in the liquid inlet area 112, the liquid outlet area 132 and the turning area 122; wherein, along the first direction X, the first width W1 of the liquid inlet area 112 is smaller than the second width W2 of the liquid outlet area 132, and the first direction X is the width direction of the box body 101.

[0037] Figure 1 A schematic diagram of a first partial top view of a box provided in an embodiment of the present disclosure; Figure 2 A schematic diagram of a second partial top view of the box provided in one embodiment of the present disclosure; Figure 3 This is a schematic diagram of a third partial top view of the box provided in an embodiment of the present disclosure. Figure 3 The positional relationship between the liquid inlet area, liquid outlet area and turning area is as follows: Figure 2 shown.

[0038] It should be noted that, in order to clearly illustrate the positional relationship between the liquid inlet area 112, the liquid outlet area 132 and the turning area 122 in the box body 101, Figure 1 and Figure 2 The specific structure of the liquid cooling channel 102 and the flow divider 103 are not shown. In addition, the first width W1 of the liquid inlet area 112 is the maximum width of the liquid inlet area 112 along the first direction X, and the second width W2 of the liquid outlet area 132 is the maximum width of the liquid outlet area 132 along the first direction X.

[0039] It is worth noting that by designing a liquid cooling channel in the box 101, the box 101 can be used not only as a liquid cooling plate, but also as a shell of a battery pack. In other words, integrating the box 101 used as a battery pack shell and the liquid cooling plate into one component is conducive to reducing the layout space occupied by the battery pack shell and the liquid cooling plate as a whole in the battery pack, so that more accommodation space in the battery pack can be designed to accommodate battery cells, which is conducive to improving the energy density of the battery pack without increasing the overall volume of the battery pack. Moreover, the box 101 with a liquid cooling channel designed inside can cool down the heating devices such as the battery cells in the battery pack to achieve heat dissipation of the heating devices such as the battery cells, which is conducive to improving the service life of the battery pack.

[0040] It should be noted that the cooling performance of the box 101 includes but is not limited to: the cooling effect of the box 101 on the heat-generating devices such as the battery cells in the battery pack. In some cases, the liquid cooling channel in the box 101 can be formed by a blowing process. In other words, the box 101 and the liquid cooling channel designed inside it are an integrated molding structure, which is conducive to improving the air tightness of the liquid cooling channel and avoiding leakage of the coolant in the liquid cooling channel, so as to ensure that there is sufficient coolant in the liquid cooling channel to ensure that the box 101 has a good cooling effect on the heat-generating devices such as the battery cells in the battery pack. In this way, the cooling performance of the box 101 also includes the air tightness of the liquid cooling channel in the box 101.

[0041] On the one hand, the liquid cooling channel 102 is roughly divided into a liquid inlet area 112, a liquid outlet area 132 and a turning area 122, so that the flow path of the coolant entering the housing 101 is roughly C-shaped, and the number of turns of the flow path of the coolant is reduced to minimize the total length of the flow path of the coolant in the housing 101, so as to ensure that the coolant has a higher flow velocity in the liquid cooling channel 102 and ensure that the coolant has a higher cooling performance.

[0042] On the other hand, diverter pieces 103 are provided in the liquid inlet area 112, the liquid outlet area 132 and the turning area 122. The diverter pieces 103 are used to disturb the coolant and increase the flow rate of the coolant in the liquid cooling channel 102 to improve the cooling performance of the coolant. The increase in the coolant flow rate is beneficial to preventing impurities in the coolant from being deposited in the liquid cooling channel 102, thereby helping to increase the service life of the box body 101.

[0043] On the other hand, the first width W1 of the liquid inlet area 112 is designed to be smaller than the second width W2 of the liquid outlet area 132, which is beneficial for making the volume of the liquid inlet area 112, which is mainly used to promote the coolant to flow into the liquid-cooling channel 102, smaller than the volume of the liquid outlet area 132, which is mainly used to promote the coolant to flow out of the liquid-cooling channel 102. This is beneficial for limiting the activity space for the coolant to flow into the liquid-cooling channel 102, that is, limiting the volume of the liquid inlet area 112, so as to increase the flow rate of the coolant just entering the liquid-cooling channel 102. After the coolant flows into the liquid outlet area 132, the larger volume of the liquid outlet area 132 can slowly reduce the flow rate of the coolant, increase the time the coolant stays in the liquid outlet area 132, and further improve the cooling performance of the coolant.

[0044] It is worth noting that the flow paths of the coolant in the liquid cooling channel 102 are the liquid inlet area 112, the turning area 122 and the liquid outlet area 132 in sequence. Therefore, after cooling the heat-generating devices in the battery pack, the coolant in the liquid inlet area 112 will flow through the turning area 122 and finally enter the liquid outlet area 132. The coolant in the liquid inlet area 112 stays in the box body 101 for a shorter time than the coolant in the liquid outlet area 132 stays in the box body 101, and the temperature of the coolant in the liquid inlet area 112 is lower than the temperature of the coolant in the liquid outlet area 132. Based on this, the first width W1 of the liquid inlet area 112 is designed to be smaller than the second width W2 of the liquid outlet area 132, which is beneficial to increase the residence time of the coolant with higher temperature in the liquid outlet area 132 while making the flow rate of the coolant in the liquid inlet area 112 greater than the flow rate of the coolant in the liquid outlet area 132, so as to avoid the phenomenon that the cooling performance of the coolant is reduced due to the increase of its own temperature after flowing into the liquid outlet area 132, so as to reduce the adverse effect of the temperature difference of the coolant in the liquid inlet area 112 and the liquid outlet area 132 on the cooling performance of the coolant, thereby balancing the cooling effect of the coolant in the liquid inlet area 112 and the liquid outlet area 132, and improving the overall cooling performance of the coolant.

[0045] In other words, in order to ensure good cooling performance of the coolant as the temperature of the coolant in the liquid-cooling channel 102 gradually increases, the flow rate of the coolant in different areas of the liquid-cooling channel 102 is adjusted, so that the first width W1 of the liquid inlet area 112 is designed to be smaller than the second width W2 of the liquid outlet area 132.

[0046] It should be noted that the cooling performance of the coolant includes but is not limited to: the cooling effect of the coolant on heat-generating devices such as battery cells in the battery pack.

[0047] An embodiment of the present disclosure will be described in more detail below with reference to the accompanying drawings.

[0048] In some embodiments, reference Figure 1 or Figure 2, the ratio of the second width W2 to the first width W1 is 1.5 to 2.5. If the ratio of the second width W2 to the first width W1 is less than 1.5, it is not conducive to increasing the difference between the volume of the liquid inlet area 112 and the volume of the liquid outlet area 132, which is not conducive to increasing the difference in the flow rate of the coolant in the liquid inlet area 112 and the liquid outlet area 132, and the effect of reducing the adverse effect of the difference in the temperature of the coolant in the liquid inlet area 112 and the liquid outlet area 132 on the cooling performance of the coolant is limited; if the ratio of the second width W2 to the first width W1 is greater than 2.5, the difference between the volume of the liquid inlet area 112 and the volume of the liquid outlet area 132 is too large, and it is easy for the liquid inlet area 112 to be filled with coolant, while the demand for coolant in the liquid outlet area 132 is too large and cannot be filled with coolant, which is easy to cause the liquid cooling channel 102 to be not fully utilized by the coolant, and it is not conducive to improving the cooling performance of the box 101. Therefore, designing the ratio of the second width W2 to the first width W1 to be 1.5-2.5 is beneficial to promoting the flow rate of the coolant in the liquid inlet area 112 and the liquid outlet area 132 to have a suitable difference in size, so as to balance the cooling effect of the coolant in the liquid inlet area 112 and the liquid outlet area 132, and to ensure that different areas of the liquid-cooling channel 102 are filled with coolant, thereby improving the utilization rate of the liquid-cooling channel 102 and enhancing the cooling performance of the box body 101.

[0049] In some examples, the ratio of the second width W2 to the first width W1 may be 1.65, 1.85, 1.96, 2.00, 2.15, 2.36, or the like.

[0050] In some examples, the first width W1 may be 180 mm to 200 mm. For example, the first width W1 may be 182.5 mm, 183 mm, 184.5 mm, 185 mm, 186.5 mm, 188.5 mm, 190 mm, 192 mm, 193 mm, 194 mm, 195 mm, 195.5 mm, 196 mm, 197 mm, 198 mm, 198.5 mm, 199 mm, or 199.5 mm.

[0051] In some examples, the second width W2 may be 400 mm to 430 mm. For example, the second width W2 may be 403 mm, 405 mm, 406 mm, 406.5 mm, 407 mm, 408 mm, 410 mm, 412 mm, 414 mm, 415 mm, 416 mm, 418 mm, 420 mm, 422 mm, 423 mm, 424 mm, 425 mm, 426 mm, 427 mm, 428 mm, or 429 mm.

[0052] The positional relationship among the liquid inlet area 112 , the liquid outlet area 132 and the turning area 122 will be described in detail below.

[0053] In some embodiments, reference Figure 1 or Figure 2 , the turning area 122 may include a first area I and a second area II, the first area I is directly opposite to the liquid inlet area 112 along the second direction Y, and the second area II is directly opposite to the liquid outlet area 132 along the second direction Y, and the second direction Y is the length direction of the box 101. In other words, the first area I is connected to the liquid inlet area 112, and the second area II is connected to the liquid outlet area 132, so that the flow path of the coolant in the box 101, that is, the liquid cooling channel 102 is roughly C-shaped.

[0054] It should be noted that Figure 1 In the figure, three rectangular dotted frames of different sizes are used to roughly illustrate the approximate positions of the liquid inlet area 112, the liquid outlet area 132 and the turning area 122 in the box body 101. In actual applications, the plane formed by the first direction X and the second direction Y is used as the reference plane. The shape of the orthographic projection of any one of the liquid inlet area 112, the liquid outlet area 132 and the turning area 122 on the reference plane can be a rectangle or other regular or irregular polygons. The shapes of the orthographic projections of the liquid inlet area 112, the liquid outlet area 132 and the turning area 122 on the reference plane can be designed according to actual conditions.

[0055] For example, in some cases, reference Figure 2 On the basis that the turning zone 122 includes the first zone I and the second zone II, the liquid outlet zone 132 may include a third zone III and a fourth zone IV, the third zone III is opposite to the liquid inlet zone 112 along the first direction X, and the fourth zone IV is opposite to the turning zone 122 along the first direction X.

[0056] In one example, continue to refer to Figure 2 In the second direction Y, the width of the first area I can be greater than the width of the second area II, so as to reserve more layout space in the box 101 for the liquid outlet area 132, which is used to layout the specific flow direction of the liquid cooling channel 102, so as to adjust the flow rate of the coolant in the liquid outlet area 132. Based on this, the edge of the fourth area IV can be aligned with the edge of the turning area 122.

[0057] It should be noted that Figure 1 and Figure 2 In the figure, the first area I and the second area II in the turning area 122 are divided by dense dotted lines, and Figure 2 The third zone III and the fourth zone IV in the liquid outlet area 132 are divided by denser dotted lines.

[0058] In some embodiments, reference Figure 1 or Figure 2, the interval D between the liquid inlet area 112 and the liquid outlet area 132 in the first direction X is 35 mm to 52 mm. For example, the interval D between the liquid inlet area 112 and the liquid outlet area 132 in the first direction X can be 36 mm, 37 mm, 37.5 mm, 38 mm, 40 mm, 42 mm, 43 mm, 45 mm, 47 mm, 49 mm, 50 mm or 51 mm, etc.

[0059] It is worth noting that if the interval D is less than 35 mm, it will affect the structural stability of the area of ​​the box body 101 that does not constitute the liquid cooling channel. It is worth noting that the area of ​​the box body 101 that does not constitute the liquid cooling channel can be regarded as the reinforcement ribs of the entire box body 101. For example, the diverter 103 and the area of ​​the box body 101 at the interval D can both be regarded as the reinforcement ribs of the box body 101 to support the liquid cooling channel. Therefore, if the interval D is less than 35 mm, it is not conducive to ensuring that the area of ​​the box body 101 at the interval D has a high supporting strength; if the interval D is greater than 52 mm, the distance between the liquid inlet area 112 and the liquid outlet area 132 is relatively far, and the turning area 122 required to be designed is relatively large. It takes a long time for the coolant to flow from the liquid inlet area 112 to the liquid outlet area 132 via the turning area 122, which is not conducive to ensuring that the flow rate of the coolant has a high flow rate, and thus is not conducive to maintaining good temperature management efficiency of the battery cell with the help of the box body 101. Therefore, the interval D between the liquid inlet area 112 and the liquid outlet area 132 in the first direction X is designed to be 35 mm to 52 mm, which is beneficial to improving the supporting effect of the box 101 on the liquid cooling channel and ensuring the overall good structural stability of the box 101, and is also beneficial to maintaining good temperature management efficiency of the battery cell with the help of the box 101.

[0060] In some examples, the interval D between the liquid inlet area 112 and the liquid outlet area 132 in the first direction X may be 40 mm to 50 mm.

[0061] In some embodiments, in conjunction with reference Figure 2 and Figure 3 The arrangement density of the plurality of diverter members 103 arranged in the liquid inlet area 112 is a first arrangement density, the arrangement density of the plurality of diverter members 103 arranged in the turning area 122 is a second arrangement density, and the arrangement density of the plurality of diverter members 103 arranged in the liquid outlet area 132 is a third arrangement density. The second arrangement density is greater than the first arrangement density, and the second arrangement density is greater than the third arrangement density.

[0062] It is worth noting that the flow path of the coolant in the box body 101 is roughly C-shaped. Not only does the connection between the turning area 122 and the liquid inlet area 112 have a corner, but the connection between the turning area 122 and the liquid outlet area 132 also has a corner. The coolant needs to rely on the turning area 122 to flow from the liquid inlet area 112 to the liquid outlet area 132. The coolant is easily obstructed at the above-mentioned corner, so that impurities in the coolant are easily deposited at the corner and further block the flow of the coolant, and even block the liquid cooling channel 102. Based on this, among the three areas of the liquid inlet area 112, the liquid outlet area 132 and the turning area 122, the arrangement density of the diverter 103 in the turning area 122, that is, the second arrangement density is the largest, so that the coolant is affected by the turbulence in the turning area 122 to the greatest extent, which is beneficial to increase the flow velocity of the coolant in the turning area 122, thereby increasing the turbulence of the coolant in the turning area 122, so as to avoid the deposition of the coolant in the turning area 122, so as to ensure that the coolant circulates in the liquid cooling channel 102 for a long time, which is beneficial to improve the service life of the box body 101.

[0063] It should be noted that the arrangement density refers to: the number of diverters 103 that can be arranged in a unit volume, and the first arrangement density refers to: the number of diverters 103 arranged in a unit volume of the liquid inlet area 112; the third arrangement density refers to: the number of diverters 103 arranged in a unit volume of the liquid outlet area 132; the second arrangement density refers to: the number of diverters 103 arranged in a unit volume of the turning area 122. In this way, the second arrangement density is greater than the first arrangement density, which means that: under the premise of the same arrangement volume, the number of diverters 103 arranged in the turning area 122 is greater than the number of diverters 103 arranged in the liquid inlet area 112. Similarly, the second arrangement density is greater than the third arrangement density, which means that: under the premise of the same arrangement volume, the number of diverters 103 arranged in the turning area 122 is greater than the number of diverters 103 arranged in the liquid outlet area 132.

[0064] In addition, regardless of whether the different diverter pieces 103 are located in the same area among the liquid inlet area 112, the liquid outlet area 132 and the turning area 122, or in different areas among the liquid inlet area 112, the liquid outlet area 132 and the turning area 122, the shapes or sizes of the different diverter pieces 103 may be the same or different.

[0065] In some embodiments, reference Figure 3 , the first arrangement density is greater than the third arrangement density.

[0066] So, combined with reference Figure 2 and Figure 3On the basis that the first width W1 of the liquid inlet area 112 is smaller than the second width W2 of the liquid outlet area 132, the number of diverter elements 103 arranged in a unit volume of the liquid inlet area 112 is greater than that of the liquid outlet area 132. Therefore, compared with the liquid outlet area 132, the coolant is more affected by turbulence in the liquid inlet area 112, which is beneficial to further increase the flow rate of the coolant in the liquid inlet area 112.

[0067] In some embodiments, in conjunction with reference Figure 2 and Figure 3 , the diverter 103 arranged in the liquid inlet area 112 is the first diverter 113, the diverter 103 arranged in the turning area 122 is the second diverter 123, and the diverter 103 arranged in the liquid outlet area 132 is the third diverter 133; along the second direction Y, the maximum length of the first diverter 113 is the first length L1, the maximum length of the second diverter 123 is the second length L2, the maximum length of the third diverter 133 is the third length L3, the third length L3 is greater than the first length L1, and the third length L3 is greater than the second length L2, the first length L1 is greater than the second length L2 of at least a part of the second diverter 123, and the second direction Y is the length direction of the box body 101.

[0068] In other words, among the first diverter 113, the second diverter 123 and the third diverter 133, the third diverter 133 has the longest length in the second direction Y. By means of the diversion effect of the third diverter 133 on the coolant, the path for the coolant in the liquid outlet area 132 to continuously flow along the second direction Y is made longer, thereby increasing the residence time of the coolant in the liquid outlet area 132.

[0069] In some examples, the first length L1 may be 86 mm to 960 mm. For example, the first length L1 may be 149 mm, 229 mm, 256 mm, 321 mm, 358 mm, or 835 mm.

[0070] In some examples, the second length L2 may be 24 mm to 102 mm. For example, the second length L2 may be 46 mm, 47 mm, 63 mm, or 64 mm.

[0071] In some examples, the third length L3 may be 1850 mm to 1965 mm. For example, the third length L3 may be 1856 mm, 1900 mm, or 1961 mm.

[0072] It should be noted that the first lengths L1 of different first flow diverters 113 may be different, the second lengths L2 of different second flow diverters 123 may be different, and the third lengths L3 of different third flow diverters 133 may be different. Based on this, the third length L3 being greater than the first length L1 means that the third length L3 of any third flow diverter 133 is greater than the first length L1 of any first flow diverter 113; the third length L3 being greater than the second length L2 means that the third length L3 of any third flow diverter 133 is greater than the second length L2 of any second flow diverter 123.

[0073] It is worth noting that the first length L1 is greater than the second length L2 of at least some of the second flow diverters 123, including at least the following two situations: in some cases, the first length L1 of any first flow diverter 113 is greater than the second length L2 of some of the second flow diverters 123, and the second length L2 of other parts of the second flow diverters 123 can be greater than the first length L1 of at least one first flow diverter 113; in other cases, the first length L1 of any first flow diverter 113 is greater than the second length L2 of any second flow diverter 123. The first flow diverter 113 is described in detail below.

[0074] In some embodiments, reference Figure 4 , Figure 4 A top view structural schematic diagram of the liquid inlet area of ​​the liquid cooling channel in the box provided in one embodiment of the present disclosure, the first diverter 113 can be a long strip structure extending along the second direction Y to promote the cooling liquid located in the liquid inlet area 112 to flow generally along the second direction Y.

[0075] In some embodiments, reference Figure 4 , the diverter 103 arranged in the liquid inlet area 112 is a first diverter 113; a plurality of first diverter 113 include N groups of first diverter groups A arranged at intervals along the first direction X, and any first diverter group A includes multiple first diverter members 113 arranged at intervals along the second direction Y, and N is a positive integer greater than or equal to 2.

[0076] It is worth noting that the N groups of first diverter components A can divide the coolant in the liquid inlet area 112 into (N+1) water inlet branches, and adjacent water inlet branches are connected at the intervals of adjacent first diverter components 113 along the second direction Y, providing more flow paths for the coolant to ensure smooth flow of the coolant in the liquid inlet area 112.

[0077] It should be noted that Figure 4 In the example, N is 3, that is, a plurality of first flow diverter members 113 are divided into three groups of first flow diverter member groups A arranged at intervals along the first direction X. In practical applications, the value of N can be flexibly selected according to needs, for example, N can be 2, 4, 5 or 6. Moreover, Figure 4 In the example, a first flow diverter group A includes 9 first flow diverters 113, and at least some of the first flow diverters 113 have different sizes; another first flow diverter group A includes 7 first flow diverters 113, and at least some of the first flow diverters 113 have different sizes; and another first flow diverter group A includes 2 first flow diverters 113 of different sizes. In actual applications, there is no restriction on the number of first flow diverters 113 included in a single first flow diverter group A, and the size relationship between different first flow diverters 113, which can be adjusted according to actual needs. In addition, Figure 4 A first flow dividing member group A is indicated by a dotted line frame.

[0078] In some embodiments, reference Figure 4 , along the first direction X, the width of the first flow diverter 113 in the Nth first flow diverter group A is greater than or equal to the width of the first flow diverter 113 in the (N-1)th first flow diverter group A. In some cases, along the first direction X, the widths of the first flow diverters 113 in different first flow diverter groups A may gradually increase.

[0079] In some embodiments, reference Figure 4 , along the second direction Y, the length of any first diverter 113 in the Nth group of first diverter groups A is greater than or equal to the length of at least one first diverter 113 in the (N-1)th group of first diverter groups A, so as to make the coolant flow as evenly as possible in the liquid cooling channel 102.

[0080] In some embodiments, reference Figure 4 , the lengths of two adjacent first flow diverters 113 in the same first flow diverter group A in the second direction Y are different. In other embodiments, the lengths of two adjacent first flow diverters in the same first flow diverter group A in the second direction may also be the same.

[0081] The third flow dividing member 133 is described in detail below.

[0082] In some embodiments, reference Figure 5 , Figure 5 A partial top-view structural schematic diagram of the turning area and the liquid outlet area of ​​the liquid cooling flow channel in the box provided in one embodiment of the present disclosure, wherein the diverter 103 arranged in the liquid outlet area 132 is the third diverter 133; partial areas of a part of the third diverter 133 are also arranged in the turning area 122.

[0083] In some embodiments, in conjunction with reference Figure 5 and Figure 6 , Figure 6A schematic diagram of a top view of the structure of the first diverter portion in a box body provided for an embodiment of the present disclosure, wherein the third diverter member 133 includes at least a first diverter portion 133a, the first diverter portion 133a includes a first baffle portion 143a located in the turning area 122 and a first guide portion 153a located in the liquid outlet area 132, the first guide portion 153a encloses a first groove 104, and along the second direction Y, the first groove 104 extends in a direction close to the turning area 122.

[0084] The first baffle 143a located in the turning area 122 is used to turn the coolant flowing through the liquid inlet area 112 to flow into the liquid outlet area 132 , and the first guide 153a is used to form a side wall of the flow channel in the liquid outlet area 132 .

[0085] In some embodiments, in conjunction with reference Figure 5 and Figure 7 , Figure 7 A schematic diagram of a top view of the structure of the second diverter portion in the box provided in an embodiment of the present disclosure, the third diverter member 133 also includes a second diverter portion 133b, the second diverter portion 133b includes a second baffle portion 143b located in the turning area 122, and a second guide portion 153b and a third guide portion 153c that are in contact and connected with different areas of the second baffle portion 143b along the first direction X, the second guide portion 153b, the third guide portion 153c and the second baffle portion 143b located between the second guide portion 153b and the third guide portion 153c together form a second groove 114, and along the second direction Y, the second groove 114 extends in a direction away from the turning area 122.

[0086] Among them, the first baffle portion 143a located in the turning area 122 is used to divert the coolant flowing through the liquid inlet area 112 and the turning area 122 to flow into the liquid outlet area 132, and the second guide portion 153b and the third guide portion 153c are both used to form side walls of the flow channel in the liquid outlet area 132.

[0087] It should be noted that the second baffle 143b can be considered to be partially located in the turning area 122 and the remaining part in the liquid outlet area 132. For example, the second baffle 143b located between the second guide portion 153b and the third guide portion 153c along the first direction X can be considered to be located in the liquid outlet area 132.

[0088] In some embodiments, in conjunction with reference Figures 5 to 8 , Figure 8The third flow diverter 133 is a schematic diagram of a top view of the structure of the third flow diverter in the box provided in an embodiment of the present disclosure. The third flow diverter 133 also includes a third flow diverter 133c, which is located between the first flow diverter 133a and the second flow diverter 133b. The third flow diverter 133c is an S-shaped structure, one end of the third flow diverter 133c is directly opposite to the first groove 104 along the second direction Y, and the other end of the third flow diverter 133c is directly opposite to the second groove 114 along the second direction Y. It can be understood that the third flow diverter 133c is also used to form the side wall of the flow channel in the liquid outlet area 132.

[0089] In some embodiments, reference Figure 8 , the third diverter portion 133c surrounds two third grooves 124; Figure 5 The third flow divider 133 further includes a fourth flow divider 133d, one fourth flow divider 133d is located between the first flow divider 133a and the third flow divider 133c, and another fourth flow divider 133d is located between the second flow divider 133b and the third flow divider 133c; wherein, in combination with reference Figures 5 to 8 One end of the fourth diverter 133d is located in the first groove 104 or the second groove 114, and the other end of the fourth diverter 133d is located in the third groove 124. It can be understood that the fourth diverter 133d is also used to form a side wall of the flow channel in the liquid outlet area 132.

[0090] In one example, refer to Figure 5 The first flow divider 133a, the second flow divider 133b, the third flow divider 133c and the fourth flow divider 133d cooperate with each other to form a path for the circulation of the cooling liquid in the liquid outlet area 132, that is, to form a liquid cooling channel 102 in the liquid outlet area 132. In other embodiments, the third flow divider may include only one, two or three of the first flow divider, the second flow divider, the third flow divider or the fourth flow divider.

[0091] In some embodiments, reference Figure 1 or Figure 2 The box body 101 may further include: a liquid inlet 111, which is arranged on a side of the liquid inlet area 112 away from the turning area 122 along the second direction Y; a liquid outlet 121, which is arranged on a side of the liquid outlet area 132 away from the turning area 122 along the second direction Y, and the second direction Y is the length direction of the box body 101.

[0092] It should be noted that, in order to illustrate the approximate positions of the liquid inlet 111 and the liquid outlet 121 in the box body 101, Figure 1 and Figure 2 In the figure, only circles are used to indicate the liquid inlet 111 and the liquid outlet 121 , and the specific shapes of the liquid inlet 111 and the liquid outlet 121 are not limited.

[0093] In some embodiments, reference Figure 1 or Figure 2 , the average value of the flow rate of the coolant in the liquid inlet area 112 is the first flow rate, the average value of the flow rate of the coolant in the turning area 122 is the second flow rate, and the average value of the flow rate of the coolant in the liquid outlet area 132 is the third flow rate, the first flow rate is less than the second flow rate, and the second flow rate is less than the third flow rate. In other words, the first flow rate of the liquid inlet area 112, the second flow rate of the turning area 122, and the third flow rate of the liquid outlet area 132 increase successively, and as the time the coolant is in the liquid cooling channel increases, the flow rate of the coolant tends to increase as a whole. It is worth noting that as the time the coolant is in the liquid cooling channel increases, the temperature of the coolant itself will rise. Based on this, the box 101 designed in one embodiment of the present disclosure is conducive to making the flow rate of the coolant tend to increase as a whole, and is conducive to compensating for the influence of the increase in the temperature of the coolant on the cooling effect by increasing the flow rate of the coolant, so as to ensure that the coolant in the liquid inlet area 112, the turning area 122 or the liquid outlet area 132 has a good cooling effect on the battery cell.

[0094] In some embodiments, reference Figure 1 or Figure 2 , the average value of the flow resistance encountered by the coolant in the liquid inlet area 112 is the first flow resistance, the average value of the flow resistance encountered by the coolant in the turning area 122 is the second flow resistance, and the average value of the flow resistance encountered by the coolant in the liquid outlet area 132 is the third flow resistance, the first flow resistance is greater than the third flow resistance, and the third flow resistance is greater than the second flow resistance. In other words, the first flow resistance of the liquid inlet area 112, the third flow resistance of the liquid outlet area 132, and the second flow resistance of the turning area 122 decrease in sequence, that is, the second flow resistance of the turning area 122 is the smallest. It is worth noting that the main flow direction of the coolant in the liquid inlet area 112 and the liquid outlet area 132 is the second direction Y, that is, the flow direction of the coolant in the liquid inlet area 112 and the liquid outlet area 132 will not change significantly, but the turning area 122 serves to connect the liquid inlet area 112 and the liquid outlet area 132. The flow direction of the coolant needs to be changed when it flows out of the liquid inlet area 112 to the turning area 122, and the flow direction of the coolant also needs to be changed when it flows out of the turning area 122 to the liquid outlet area 132. Based on this, the box body 101 designed in an embodiment of the present disclosure is conducive to minimizing the second flow resistance of the coolant in the turning area 122, so as to ensure that the flow rate of the coolant in the turning area 122 will not be too low when the coolant needs to turn, so as to ensure that the coolant in the turning area 122 has a good cooling effect on the battery cell.

[0095] In addition, the coolant first enters the liquid inlet area 112, so that compared with the turning area 122 and the liquid outlet area 132, the coolant in the liquid inlet area 112 absorbs the heat emitted by the battery cell for a shorter time, so that the coolant in the liquid inlet area 112 has a lower temperature. Based on this, the box 101 designed in an embodiment of the present disclosure is conducive to making the first flow resistance of the coolant in the liquid inlet area 112 greater than the third flow resistance in the liquid outlet area 132, so that the coolant with a lower temperature can circulate in the liquid inlet area 112 for a longer time to improve the cooling of the battery cell, and the coolant with a higher temperature can circulate in the liquid outlet area 132 for a shorter time to discharge the coolant with a higher temperature out of the box 101 more quickly. Therefore, the first flow resistance is greater than the third flow resistance, and the third flow resistance is greater than the second flow resistance, which is conducive to improving the cooling effect of the coolant on the battery cell as a whole.

[0096] In summary, the flow divider 103 is provided in the liquid inlet area 112, the liquid outlet area 132 and the turning area 122. The flow divider 103 is used to disturb the coolant, so as to increase the flow rate of the coolant in the liquid cooling channel 102 to improve the cooling performance of the coolant. The increase in the flow rate of the coolant is conducive to preventing the impurities in the coolant from being deposited in the liquid cooling channel 102, thereby facilitating the improvement of the service life of the housing 101. Moreover, the first width W1 of the liquid inlet area 112 is designed to be smaller than the second width W2 of the liquid outlet area 132, which is conducive to limiting the activity space of the coolant flowing into the liquid cooling channel 102, that is, limiting the volume of the liquid inlet area 112, so as to increase the flow rate of the coolant just entering the liquid cooling channel 102. After the coolant flows into the liquid outlet area 132, the flow rate of the coolant can be slowly reduced by virtue of the larger volume of the liquid outlet area 132, and the time for the coolant to stay in the liquid outlet area 132 is increased, so as to further improve the cooling performance of the coolant.

[0097] Another embodiment of the present disclosure further provides a battery pack, referring to Fig. 9 or Fig.10 The battery pack 105 includes: a box 101 provided in an embodiment of the present disclosure. It should be noted that the parts that are the same or corresponding to the above embodiments are not described in detail here.

[0098] In some embodiments, reference Fig. 9 or Fig.10 , Fig. 9 A partial three-dimensional structural schematic diagram of a battery pack provided in another embodiment of the present disclosure is shown. Fig.10 Another partial three-dimensional structural schematic diagram of a battery pack provided for another embodiment of the present disclosure, the battery pack 105 may also include: a plurality of battery cells 106, the battery cells 106 include a top surface 116 and a bottom surface 126 facing each other along a third direction Z, and the third direction Z is the thickness direction of the box body 101.

[0099] In some cases, reference Fig. 9The box body 101 is located on the side of the top surface 116 away from the bottom surface 126. In other words, the box body 101 can be used as an upper cover of the battery pack 105, and a liquid cooling channel 102 is provided in the upper cover to cool the battery cell.

[0100] In other cases, reference Fig.10 The box body 101 is located on the side of the bottom surface 126 away from the top surface 116. In other words, the box body 101 can be used as the bottom plate of the battery pack 105, and a liquid cooling channel 102 is provided in the bottom plate to cool the battery cells.

[0101] It should be noted that Fig. 9 and Fig.10 The figure only shows two application scenarios of the box 101 in the battery pack 105. In actual application, the positional relationship between the box 101 and other components in the battery pack 105, such as the battery cell 106, can be flexibly adjusted according to the needs. Fig. 9 and Fig.10 The figure is only an example of an arrangement of several battery cells 106 in the battery pack 105. In actual applications, there is no restriction on the number of battery cells 106 included in the battery pack 105, and the arrangement and connection method between the multiple battery cells 106, which can be designed according to actual needs.

[0102] In summary, based on the design of the cooling channel in the box 101, the cooling performance and service life of the box 101 are improved. Therefore, after the box 101 is applied to the battery pack 105, the heat dissipation effect of the box 101 on the heat generating devices in the battery pack 105, such as the battery cell 106, can be improved, which is conducive to improving the service life of the battery pack 105. In addition, the box 101 used as the outer shell of the battery pack 105 and the liquid cooling plate are integrated into one component, which is conducive to reducing the layout space occupied by the outer shell of the battery pack 105 and the liquid cooling plate as a whole in the battery pack 105, so that more accommodation space in the battery pack 105 is designed to accommodate the battery cell 106, which is conducive to improving the energy density of the battery pack 105 without increasing the overall volume of the battery pack 105.

[0103] Another embodiment of the present disclosure also provides an energy storage system. Figures 1 to 8 , the energy storage system includes a box 101 provided in an embodiment of the present disclosure, or, referring to Fig. 9 or Fig.10 , the energy storage system includes a battery pack 105 provided in another embodiment of the present disclosure. It should be noted that the parts that are the same or corresponding to the above embodiments are not described in detail here.

[0104] In some embodiments, the energy storage system may include a plurality of battery packs 105 electrically connected in sequence.

[0105] It should be noted that another embodiment of the present disclosure does not limit the number of battery packs 105 included in the energy storage system.

[0106] Those skilled in the art can understand that the above-mentioned embodiments are specific examples for implementing the present disclosure, and in practical applications, various changes can be made to them in form and detail without departing from the spirit and scope of the embodiments of the present disclosure. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the embodiments of the present disclosure, so the protection scope of the embodiments of the present disclosure shall be based on the scope defined in the claims.

Claims

1. A box for a battery pack, characterized in that: include: A liquid cooling channel is provided inside the box, wherein the liquid cooling channel comprises a liquid inlet area, a liquid outlet area and a turning area connecting the liquid inlet area and the liquid outlet area; A plurality of flow dividers are interspersed in the liquid inlet area, the liquid outlet area and the turning area; Wherein, along the first direction, the first width of the liquid inlet area is smaller than the second width of the liquid outlet area, and the first direction is the width direction of the box body; The turning area includes a first area and a second area, the first area is directly opposite to the liquid inlet area along a second direction, and the second area is directly opposite to the liquid outlet area along the second direction, and the second direction is the length direction of the box body; The liquid outlet area includes a third area and a fourth area, the third area is opposite to the liquid inlet area along the first direction, the fourth area is opposite to the turning area along the first direction, and in the second direction, the width of the first area is greater than the width of the second area.

2. The box according to claim 1, characterized in that: The flow divider disposed in the liquid inlet area is a first flow divider, the flow divider disposed in the turning area is a second flow divider, and the flow divider disposed in the liquid outlet area is a third flow divider; Along the second direction, the maximum length of the first diverter is the first length, the maximum length of the second diverter is the second length, the maximum length of the third diverter is the third length, the third length is greater than the first length, and the third length is greater than the second length, the first length is greater than the second length of at least a part of the second diverter, and the second direction is the length direction of the box.

3. The box according to claim 2, characterized in that: The path for the coolant to continuously flow in the liquid inlet area is the first path, the path for the coolant to continuously flow in the turning area is the second path, and the path for the coolant to continuously flow in the liquid outlet area is the third path. The third path is larger than the first path, and the third path is larger than the second path.

4. The box according to any one of claims 1 to 3, characterized in that: The flow dividing member arranged in the liquid inlet area is a first flow dividing member; The plurality of first flow diverter members include N groups of first flow diverter members spaced apart and arranged along the first direction, and any first flow diverter member group includes a plurality of first flow diverter members spaced apart and arranged along the second direction, and N is a positive integer greater than or equal to 2; Wherein, along the first direction, the width of the first diverter in the Nth group of the first diverter groups is greater than or equal to the width of the first diverter in the (N-1)th group of the first diverter groups; or, along the second direction, the length of any first diverter in the Nth group of the first diverter groups is greater than or equal to the length of at least one first diverter in the (N-1)th group of the first diverter groups.

5. The box according to any one of claims 1 to 3, characterized in that: The flow divider disposed in the liquid outlet area is a third flow divider; a portion of the third flow divider's partial areas are also disposed in the turning area; The third flow diverter includes at least a first flow diverter portion, the first flow diverter portion includes a first baffle portion located in the turning area and a first guide portion located in the liquid outlet area, the first guide portion encloses a first groove, and along the second direction, the first groove extends in a direction close to the turning area.

6. The box according to claim 5, characterized in that: The third flow diverter also includes a second flow diverter portion, the second flow diverter portion includes a second baffle portion located in the turning area, and a second guide portion and a third guide portion that are in contact and connected with different areas of the second baffle portion along the first direction, the second guide portion, the third guide portion and the second baffle portion located between the second guide portion and the third guide portion together form a second groove, and along the second direction, the second groove extends in a direction away from the turning area.

7. The box according to claim 6, characterized in that: The second baffle portion is partially located in the turning area, and the remaining portion is located in the liquid outlet area.

8. The box according to claim 6, characterized in that: The third flow dividing member further comprises a third flow dividing portion and a fourth flow dividing portion; The third flow splitter is located between the first flow splitter and the second flow splitter, the third flow splitter is an S-shaped structure, one end of the third flow splitter is directly opposite to the first groove along the second direction, the other end of the third flow splitter is directly opposite to the second groove along the second direction, and the third flow splitter forms two third grooves; One of the fourth diverter portions is located between the first diverter portion and the third diverter portion, and the other of the fourth diverter portion is located between the second diverter portion and the third diverter portion, wherein the fourth diverter portion is a Z-shaped structure, one end of the fourth diverter portion is located in the first groove or the second groove, and the other end of the fourth diverter portion is located in the third groove.

9. A battery pack, characterized in that: include: A casing according to any one of claims 1 to 8.

10. An energy storage system, characterized in that: include: A box according to any one of claims 1 to 8, or a battery pack according to claim 9.

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