Partition plate, tray, battery case, battery pack, and cooling method for battery pack

Abstract

Disclosed in the present application are a partition plate, a tray, a battery case, a battery pack, and a cooling method for a battery pack. The partition plate is applied to a battery case and comprises a first body and a first flow guide assembly, wherein a backflow hole and a plurality of mounting holes are provided in the first body in a manner of penetrating therethrough and in a first direction, the mounting holes are configured to mount battery cells of a battery module, a liquid output region is formed on one side face of the first body in the first direction, the liquid output region is configured to be in communication with a liquid outlet of the battery case, the liquid output region and the backflow hole are respectively adjacent to two ends of the first body in a second direction, the mounting holes are located between the liquid output region and the backflow hole, and the first direction and the second direction are arranged at an included angle; and the first flow guide assembly is located on the same side face of the first body as the liquid output region, the first flow guide assembly comprises a plurality of first flow guide grooves, first ends of all the first flow guide grooves being in communication with the liquid output region, and second ends of all the first flow guide grooves being in communication with a region where the battery module is located, and the first flow guide assembly is configured to guide to the liquid output region a cooling liquid in the region where the battery module is located.

Description

Partition, tray, battery box, battery pack and battery pack cooling method

[0001] TECHNICAL FIELD

[0002] The present application relates to the field of battery technology, for example, to a partition, a tray, a battery box and a battery pack including the battery box, and also to a cooling method for the battery pack.

[0003] Background

[0004] A battery pack generally includes a battery case and a battery module disposed in the battery case. The battery module is formed by a number of battery cells arranged in a set manner. The heat dissipation of the battery pack is extremely important. The quality of the heat dissipation effect directly affects the service life of the battery pack. Currently, the battery pack adopts air cooling, water cooling plate cooling and immersion in coolant cooling to dissipate heat. For the immersion in coolant heat dissipation method, the coolant is directly sent into the battery case to contact the battery cell shell for heat exchange. At present, this heat dissipation method generally provides a liquid inlet at one end of the length direction of the battery case and a liquid outlet at the other end. The coolant is introduced into the liquid inlet, and the coolant immerses the battery cell and then flows out from the liquid outlet. The coolant is cooled on the outside of the battery case and then transported to the liquid inlet after cooling. This cycle is repeated to cool the battery cell of the battery module.

[0005] The related technology has the following situation: after the coolant enters the battery case, the position close to the liquid inlet can be exposed to more coolant with lower temperature, while the position far from the liquid inlet has less contact or even no contact with the coolant with lower temperature, resulting in some battery cells in the battery case not being immersed in the coolant with lower temperature. These battery cells are prone to poor heat exchange, and battery cells with poor heat exchange effect will age prematurely and reduce capacity, thereby reducing the service life of the battery pack.

[0006] Technical Problem

[0007] The embodiment of the present application provides a partition, which can increase the guiding effect of the coolant in the battery box, improve the heat exchange effect of each battery cell, and extend the service life of the battery cell.

[0008] An embodiment of the present application provides a tray that can disperse the coolant entering the battery box so that each battery cell can be more evenly immersed in the coolant with a lower temperature, reducing the chance of the coolant flowing back to the battery cells that have already been heated, thereby extending the service life of the battery cells.

[0009] The embodiments of the present application provide a battery box and a battery pack, which have a simple structure, uniform heat exchange of battery cells, and a long service life of the battery pack.

[0010] An embodiment of the present application provides a cooling method for a battery pack, which can effectively improve the uniformity of heat dissipation of each battery cell in the battery pack, thereby extending the service life of the battery pack.

[0011] Technical Solution

[0012] In a first aspect, an embodiment of the present application provides a separator applied to a battery box, comprising:

[0013] a first body, wherein a return hole and a plurality of mounting holes are formed on the first body along a first direction, the mounting holes being configured to mount battery cells of a battery module, a liquid outlet area being formed on one side surface of the first body along the first direction, the liquid outlet area being configured to be a liquid outlet connected to the battery case, the liquid outlet area and the return hole being respectively adjacent to two ends of the first body along a second direction, the mounting holes being located between the liquid outlet area and the return hole, and the first direction being arranged at an angle to the second direction;

[0014] A first flow guide component, wherein the first flow guide component and the liquid outlet area are located on the same side of the first body, the first flow guide component includes a plurality of first flow guide grooves, the first ends of all the first flow guide grooves are connected to the liquid outlet area, and the second ends of all the first flow guide grooves are connected to the area where the battery module is located, and the first flow guide component is configured to introduce the coolant in the area where the battery module is located into the liquid outlet area.

[0015] In a second aspect, an embodiment of the present application provides a tray, which is applied to a battery box, comprising:

[0016] A second body, wherein the second body is provided with a liquid inlet area, the liquid inlet area is configured to be connected to the liquid inlet of the battery box, and the liquid inlet area is provided on one side surface of the second body along the first direction;

[0017] a third flow guide assembly, the third flow guide assembly and the liquid inlet area being located on the same side of the second body, the third flow guide assembly comprising a plurality of third flow guide grooves, the first ends of all the third flow guide grooves being in communication with the liquid inlet area, the second ends of all the third flow guide grooves being in communication with the area where the battery modules are located, the third flow guide assembly being configured to disperse and guide the coolant in the liquid inlet area to the battery modules;

[0018] The guide plate and the third guide component are located on the same side of the second body along the first direction, and the guide plate and the third guide component are respectively adjacent to the two ends of the second body along the second direction, and a guide surface is provided on a side of the guide plate close to the third guide component.

[0019] In a third aspect, an embodiment of the present application provides a battery box, comprising:

[0020] A box body, wherein a liquid inlet and a liquid outlet are provided on the box body at intervals, and a receiving cavity for receiving a battery module is provided in the box body;

[0021] A partition, the partition is arranged in the accommodating cavity, the partition divides the accommodating cavity into a first chamber and a second chamber distributed along a first direction, the partition is provided with a plurality of mounting holes for installing the battery cells of the battery module, the two ends of the battery cells extend into the first chamber and the second chamber respectively, a reflux hole is provided on the partition, the partition has a liquid outlet area connected to the liquid outlet, the liquid outlet area is located in the first chamber, the liquid outlet area and the reflux hole are respectively adjacent to the two ends of the partition along the second direction, the liquid outlet is connected to the liquid outlet area, the second chamber has a liquid inlet area, the liquid inlet area and the liquid outlet area are respectively adjacent to the same end of the box body along the second direction, the liquid inlet is connected to the liquid inlet area, wherein the first direction and the second direction are arranged at an angle.

[0022] In a fourth aspect, an embodiment of the present application provides a battery pack, comprising a battery module and a battery case, wherein the battery module is sealed and installed in the battery case, and the battery case is the battery case described in the third aspect.

[0023] In a fifth aspect, an embodiment of the present application provides a battery pack cooling method, which is applied to the battery pack described in the fourth aspect and includes the following steps:

[0024] Providing a coolant so that the coolant enters the second chamber from the liquid inlet of the battery case and immerses the portion of the battery cell located in the second chamber along a second direction from an end of the second chamber where the liquid inlet area is provided toward an end away from the liquid inlet area;

[0025] The coolant in the second chamber enters the first chamber through the reflux hole on the partition plate, and immerses the portion of the battery cell located in the first chamber along the second direction from the end of the first chamber where the reflux hole is provided toward the end where the liquid outlet area is located;

[0026] The coolant is collected in the liquid outlet area and discharged through the liquid outlet of the battery box.

[0027] Beneficial Effect

[0028] The beneficial effects of the present application are as follows: by providing a reflux hole through the first body, the coolant on the side of the first body away from the liquid outlet area can be introduced into the side of the first body where the liquid outlet area is located through the reflux hole, and the reflux hole and the liquid outlet area are respectively arranged at both ends of the first body along the second direction, so that the coolant can be immersed in the battery cells protruding from the first body in sequence from the position where the reflux hole is located, and then collected in the liquid outlet area after heat exchange, and discharged from the liquid outlet, thereby increasing the heat exchange effect of the battery cells. In addition, a first guide component is provided between the liquid outlet area and the battery module, so that all the coolant that has completed heat exchange at the battery cells can be collected to the liquid outlet area as soon as possible, thereby accelerating the discharge of the higher temperature coolant after heat exchange and improving the cooling effect.

[0029] The beneficial effects of the present application are as follows: by arranging a liquid inlet area and a third guide component on the tray, the liquid inlet area is configured to receive coolant from the liquid inlet of the battery box, and the third guide component disperses the coolant in the liquid inlet area and guides it to the battery module, so that the battery module can be more evenly immersed in the coolant for heat exchange and heat dissipation, thereby improving the heat dissipation effect of the battery module, and a guide plate is provided, which can guide the coolant after heat exchange with the battery module to other areas for heat exchange or to the outside of the battery box, ensuring that heat exchange in other areas can proceed smoothly and reducing the chance of coolant flowing back to the battery module that has already been heat exchanged.

[0030] The beneficial effects of the present application are as follows: by setting a partition, the partition divides the accommodating cavity in the box body into an independent first chamber and a second chamber. After the partition is installed with the battery cell, the two chambers are relatively sealed. The coolant first enters the liquid inlet area of ​​the second chamber from the liquid inlet, and then immerses the part of the battery cell located in the second chamber in sequence along the second direction from the end close to the liquid inlet area toward the end away from the liquid inlet area, and performs heat exchange and heat dissipation on the battery cell. Then, it enters the first chamber again through the reflux hole on the partition, and immerses the part of the battery cell located in the first chamber in sequence from the side where the reflux hole is located toward the liquid outlet area, and performs heat exchange and heat exchange on the remaining part of the battery cell. The coolant after the heat exchange is completed is collected in the liquid outlet area and then discharged through the liquid outlet. During the whole process, the coolant performs step-by-step heat exchange on the battery cells of the battery module. The special infiltration path of the coolant increases the probability of each battery cell contacting the coolant, improves the heat exchange uniformity and effect of all battery cells, and extends the service life of the battery cell.

[0031] BRIEF DESCRIPTION OF THE DRAWINGS

[0032] FIG1 is a schematic front view of a partition according to an embodiment of the present application.

[0033] FIG2 is a perspective schematic diagram of a partition according to an embodiment of the present application.

[0034] FIG3 is a three-dimensional schematic diagram of the partition according to the embodiment of the present application from another perspective.

[0035] FIG4 is an enlarged schematic diagram of point A in FIG1 .

[0036] FIG5 is an enlarged schematic diagram of point B in FIG1 .

[0037] FIG6 is a schematic front view of a tray according to an embodiment of the present application.

[0038] FIG. 7 is a perspective view of a tray according to an embodiment of the present application.

[0039] FIG8 is a three-dimensional view of the tray according to the embodiment of the present application from another perspective.

[0040] FIG9 is an enlarged schematic diagram of point C in FIG6 .

[0041] FIG10 is a perspective view of the tray and the box body as an integrated structure according to an embodiment of the present application.

[0042] FIG11 is a three-dimensional view from another perspective showing the tray and the box body as an integrated structure in an embodiment of the present application.

[0043] FIG12 is a top view of the battery case according to an embodiment of the present application.

[0044] FIG13 is a perspective view of a battery box according to an embodiment of the present application.

[0045] FIG14 is a three-dimensional view of the battery box according to an embodiment of the present application from another perspective.

[0046] FIG15 is a top view of the battery case according to an embodiment of the present application (the second sealing plate is not shown).

[0047] FIG16 is a three-dimensional view of the battery box according to an embodiment of the present application (showing the second sealing plate).

[0048] FIG17 is a top view of the battery pack according to an embodiment of the present application (the second sealing plate is not shown).

[0049] FIG18 is a three-dimensional view of the battery pack according to an embodiment of the present application (the second sealing plate is not shown).

[0050] FIG19 is an exploded view of the battery pack according to an embodiment of the present application.

[0051] FIG20 is a perspective three-dimensional view of the box body according to an embodiment of the present application.

[0052] FIG21 is a three-dimensional view of the box body from another perspective of the embodiment of the present application.

[0053] Figure 22 is a cross-sectional view of the battery pack of an embodiment of the present application (the direction of the arrow is the direction of coolant flow).

[0054] FIG23 is a partial cross-sectional view of the partition according to an embodiment of the present application.

[0055] FIG24 is a schematic cross-sectional view of the diverter according to an embodiment of the present application.

[0056] In the picture:

[0057] 100. Battery box;

[0058] 1. Box body;

[0059] 101, liquid inlet; 102, liquid outlet; 103, first chamber; 104, second chamber; 105, first side plate; 106, second side plate; 107, third groove; 108, protrusion structure; 109, groove structure; 1010, mounting portion; 1011, sealing groove; 1012, step; 1013, second pressure relief hole; 1014, opening;

[0060] 2. Partition;

[0061] 201, first body; 2011, reflux hole; 20111, arc-shaped hole wall; 20112, plane hole wall; 2012, mounting hole; 2013, liquid outlet area; 2014, first protrusion; 2015, immersion hole; 2016, first groove; 2017, through hole; 2018, collecting tank; 202, first guide assembly; 2021, first guide groove; 2022, first guide plate; 20221, first outer guide plate; 20222, first inner guide plate; 203, second guide assembly; 2031, second guide groove; 2032, second guide plate; 204, liquid inlet pipe; 205, blocking plate; 2051, blocking plate guide surface;

[0062] 3. Pallet;

[0063] 301, second body; 3011, liquid inlet area; 3012, mounting groove; 3013, first pressure relief hole; 3014, second groove; 3015, pressure relief groove; 3016, second protrusion; 302, third guide assembly; 3021, third guide groove; 3022, third guide plate; 30221, third outer guide plate; 30222, third inner guide plate; 303, guide plate; 3031, guide surface; 304, diverter; 3041, diverter top surface; 3042, diverter outer peripheral surface; 30421, connecting surface; 30422, diverter guide surface; 3043, diverter bottom surface; 305, connecting protrusion; 3051, slot; 306, support;

[0064] 4. First sealing plate; 5. Second sealing plate; 6. Liquid inlet connector; 7. Liquid outlet connector;

[0065] 200, battery module; 210, battery cell group; 211, battery cell; 220, flow guide gap.

[0066] DETAILED DESCRIPTION

[0067] As shown in Figures 1 to 3 (refer to Figures 15 to 17, Figure 19 and Figure 22), an embodiment of the present application provides a partition 2, which is applied to the battery case 100 of the battery pack. In this embodiment, the first direction is the vertical direction (the height direction of the battery case 100, that is, the height direction of the partition 2), the second direction is the length direction of the battery case 100, that is, the length direction of the partition 2, and the third direction is the width direction of the battery case 100, that is, the width direction of the partition 2.

[0068] In this embodiment, the partition 2 includes a first body 201 and a first flow guide component 202, wherein the first body 201 is provided with a return hole 2011 and a plurality of mounting holes 2012 along the first direction, and the mounting hole 2012 is configured to install the battery cell 211 of the battery module 200 in the battery box 100, and the upper side surface of the first body 201 along the first direction is formed with a liquid outlet area 2013, and this liquid outlet area 2013 is configured to be connected to the liquid outlet 102 of the battery box 100, and the coolant collected in the liquid outlet area 2013 will be discharged to the outside of the battery box 100 through the liquid outlet 102, and the liquid outlet area 2013 is adjacent to the return hole 2011 respectively. At the two ends of the first body 201 along the second direction, that is, the two ends of the liquid outlet area 2013 and the return hole 2011 in the length direction of the partition 2, the mounting hole 2012 is located between the liquid outlet area 2013 and the return hole 2011, and the first guide component 202 and the liquid outlet area 2013 are both located on the upper side of the first body 201. The first guide component 202 includes multiple first guide grooves 2021, and one end of all the first guide grooves 2021 is connected to the liquid outlet area 2013, and the other end is connected to the area where the battery module 200 is located. The first guide component 202 is configured to introduce the cooling liquid in the area where the battery module 200 is located into the liquid outlet area 2013.

[0069] The partition 2 of this embodiment is provided with a reflux hole 2011 on the first body 201, so that the cooling liquid on the side of the first body 201 away from the liquid outlet area 2013 (i.e., the lower side of the partition 2) can be introduced into the side of the first body 201 where the liquid outlet area 2013 is located (i.e., the upper side of the partition 2) through the reflux hole 2011. The reflux hole 2011 and the liquid outlet area 2013 are respectively adjacent to the two ends of the first body 201 along the second direction, so that the cooling liquid can be discharged from the reflux hole 2011. The position of 2011 is sequentially immersed in the battery cells 211 protruding from the first body 201, and then collected in the liquid outlet area 2013 after heat exchange and discharged from the liquid outlet 102, thereby increasing the heat exchange effect of the battery cells 211. In addition, a first guide component 202 is arranged between the liquid outlet area 2013 and the battery module 200, which can quickly collect all the coolant that has completed the heat exchange at the battery cells 211 to the liquid outlet area 2013, accelerate the discharge of the higher temperature coolant after the heat exchange, and improve the cooling effect.

[0070] In one embodiment, the battery module 200 has multiple rows of battery cell groups 210 arranged along a third direction, each row of battery cell groups 210 includes multiple battery cells 211 arranged along a second direction, the third direction is set at an angle to the first direction and the second direction, and a guide gap 220 is formed between at least two adjacent rows of battery cell groups 210, and multiple first guide grooves 2021 correspond one-to-one to the multiple guide gaps 220. By arranging the guide gaps 220 between the battery cell groups 210 in one-to-one correspondence with the first guide grooves 2021, after the coolant is introduced into the reflux hole 2011, the coolant will be diverted through multiple guide gaps 220, increasing the chance of each battery cell 211 in each row of battery cell groups 210 coming into contact with the coolant. After the first guide grooves 2021 are correspondingly connected to the guide gaps 220, most of the coolant after heat exchange between the two adjacent rows of battery cell groups 210 is collected to the liquid outlet area 2013 through the first guide grooves 2021, and then discharged to the outside of the battery case 100 as quickly as possible through the liquid outlet 102, thereby reducing the backflow or mixed flow of the coolant after heat exchange between the two adjacent rows of battery cell groups 210 to other rows of battery cell groups 210, thereby avoiding the situation of low local heat exchange efficiency of the battery cells 211.

[0071] In one embodiment, both end surfaces of the first body 201 along the third direction are spaced from the walls of the mounting hole 2012, thereby forming a flow-guiding gap 220 on both sides of the battery module 200 along the third direction. In one embodiment, because the mounting hole 2012 is spaced from both end surfaces of the first body 201 along the third direction, the battery cells 211 can be spaced from the end surfaces of the first body 201 (i.e., the partition 2) after installation. After the partition 2 is installed in the battery case 100, a gap is formed between the battery cells 211 and the inner wall of the battery case 100. This gap also serves as a flow-guiding gap 220 for the coolant to pass through. A first flow-guiding groove 2021 is also provided corresponding to the flow-guiding gap 220 at this location. This ensures that the battery cells 211 on both sides of the battery module 200 along the third direction are exposed to the coolant at a lower temperature, ensuring uniform heat exchange for the battery cells 211 at this location.

[0072] In one embodiment, the first flow guide assembly 202 includes a plurality of spaced-apart first flow guide plates 2022, with a first flow guide groove 2021 formed between adjacent first flow guide plates 2022. One end of the first flow guide plate 2022 extends to the liquid outlet area 2013, and the other end extends to an area adjacent to the battery module 200. The outwardly projecting first flow guide plates 2022 can reduce the overall thickness of the first body 201, thereby reducing the space occupied by the entire separator 2 within the battery case 100, thereby improving the energy density of the entire battery pack. Furthermore, the area of ​​the battery cells 211 blocked by the first body 201 is reduced, thereby allowing more area of ​​the battery cells 211 to be immersed in the coolant for heat dissipation.

[0073] In one embodiment, the first deflector 2022 and the first body 201 are integrally molded by plastic injection molding. This integral injection molding method can reduce the difficulty of installing and manufacturing the first deflector 2022, reduce the number of parts, and lower costs. Of course, the first deflector 2022 can also be manufactured separately and then secured to the first body 201 by bonding, welding, screwing, clamping, or other methods.

[0074] In other embodiments, the separate first guide plate 2022 may not be provided, and the thickness of the first body 201 may be increased, and the first guide groove 2021 may be formed by cutting a groove in the first body 201 .

[0075] In one embodiment, as shown in FIG4 (see also FIG1 to FIG3, FIG15 to FIG17, FIG19, and FIG22), the width of the first guide plate 2022 at the end adjacent to the liquid outlet region 2013 is L1, and the width of the first guide plate 2022 at the end adjacent to the battery cell 211 is L2, where L1 is smaller than L2. By widening the portion of the first guide plate 2022 adjacent to the battery cell 211, the flow of coolant within the guide gap 220 into other areas can be minimized. The narrowing of the end of the first guide plate 2022 adjacent to the liquid outlet region 2013 is intended to create a convergence effect. Because the liquid outlet region 2013 is generally designed to be smaller than the width of the battery module 200 (i.e., the dimension of the battery module 200 along the third direction), the first guide assembly 202 needs to be tightened.

[0076] The shape of the end face of the first guide plate 2022 adjacent to one end of the battery cell 211 matches the outer shape of the battery cell 211. This design is to enable the first guide plate 2022 to fit the shape of the battery cell 211 more closely, thereby forming a better guide effect and allowing the coolant in the guide gap 220 to enter the first guide groove 2021 with less resistance.

[0077] In this embodiment, the battery cell 211 is a cylindrical battery cell, and the end surface of the first guide plate 2022 near the battery cell 211 is a curved surface. Of course, the battery cell 211 is not limited to a cylindrical shape, and can also be square, polygonal, or irregularly shaped. In this case, the shape of the end surface of the first guide plate 2022 near the battery cell 211 can be adjusted according to the shape of the battery cell 211.

[0078] In addition, the end surface of the first guide plate 2022 adjacent to one end of the battery cell 211 is spaced from the outer wall of the battery cell 211. This design can prevent the first guide plate 2022 from directly abutting against the outer wall of the battery cell 211, thereby preventing the first guide plate 2022 from blocking the battery cell 211, allowing the battery cell 211 to be in contact with the coolant for heat exchange as much as possible.

[0079] In one embodiment, as shown in FIG23 (see FIG1 to FIG22 ), a collection groove 2018 is recessed in the liquid outlet region 2013 of the first body 201, and all first guide grooves 2021 are connected to the collection groove 2018. The recessed collection groove 2018 improves the collection effect, accelerating the collection of coolant within the first guide grooves 2021 into the collection groove 2018 and reducing the chance of coolant within the first guide grooves 2021 flowing back into the guide gap 220 of the battery module 200.

[0080] In this embodiment, the collecting groove 2018 is an arc-shaped groove. This design can reduce the resistance of the coolant when it collects in the collecting groove 2018, accelerate the collection of the coolant in the collecting groove 2018, and quickly transport the coolant to the outside of the battery box 100 through the liquid outlet 102.

[0081] In one embodiment, the two first guide plates 2022 located on the outermost sides of the first guide assembly 202 along the third direction are first outer guide plates 20221. The two first outer guide plates 20221 are connected at one end away from the battery cells 211. The remaining first guide plates 2022 are first inner guide plates 20222. The ends of the first inner guide plates 20222 that are closer to the first outer guide plates 20221 are spaced apart from the inner sidewalls of the first outer guide plates 20221 to form a liquid outlet area 2013. By arranging the liquid outlet area 2013 within the first guide assembly 202 and shielding the liquid outlet area 2013 with the two first outer guide plates 20221, the coolant introduced into the first guide grooves 2021 is effectively prevented from entering the exterior of the liquid outlet area 2013.

[0082] Of course, the two first outer guide plates 20221 can also be disconnected, and the first outer guide plate 20221 can be extended. After the partition 2 is installed on the box body 1 of the battery box 100, the end of the first outer guide plate 20221 away from the battery cell 211 can be pressed against the inner wall of the box body 1, which can also achieve the same effect.

[0083] In one embodiment, an immersion hole 2015 is formed through the first body 201 along a first direction. The immersion hole 2015 is located between adjacent mounting holes 2012 and is formed corresponding to the gap between adjacent battery cells 211. The size of the immersion hole 2015 is smaller than the size of the return hole 2011. By providing the immersion hole 2015, before the coolant reaches the return hole 2011, some coolant with a lower temperature can be immersed from the lower area of ​​the first body 201 to perform heat exchange and heat dissipation on the battery cells 211 in the upper area of ​​the first body 201, thereby improving the cooling effect. After the coolant introduced through the return hole 2011 enters the guide gap 220 of the battery module 200 located above the first body 201, it is mixed with the coolant that has passed through the immersion hole 2015 to perform heat exchange and heat dissipation on the battery cells 211. The temperature of the coolant in the upper area of ​​the first body 201 will be higher than that in the lower area. In order to achieve consistent heat dissipation effects in the upper and lower parts of the battery cell 211, the immersion hole 2015 has the effect of supplementing the coolant with a lower temperature, mixing the coolant introduced from the return hole 2011, and lowering the temperature of the coolant in the area above the first body 201; by setting the size of the immersion hole 2015 to be smaller than the size of the return hole 2011, the amount of coolant passing through the immersion hole 2015 can be reduced, avoiding affecting the amount of coolant at the return hole 2011, so that the battery cell 211 adjacent to the return hole 2011 can maintain a normal heat exchange and heat dissipation effect.

[0084] In this embodiment, the sum of the areas of all the immersion holes 2015 on the first body 201 is S1, and the area of ​​the first body 201 is S2. The relationship ratio between S1 and S2 can satisfy: 1:25000-3:50000. For example, the relationship ratio between S1 and S2 can be 1:25000, 1:20000, 3:50000, etc. After the sum of the areas of the immersion holes 2015 S1 satisfies the above relationship ratio, a reasonable immersion amount can be maintained, and the situation where the immersion amount is too large and affects the flow rate of the coolant at the return hole 2011 can be avoided.

[0085] The area of ​​a single immersion hole 2015 is S3, and the area of ​​a single return hole 2011 is S4. The relationship ratio between S3 and S4 can satisfy: 2:25-1:8. For example, the relationship ratio between S3 and S4 can be 2:25, 2:23, 2:20, 2:18, 2:17 or 1:8, etc. The area of ​​a single immersion hole 2015 needs to be much smaller than the area of ​​a single return hole 2011, which is conducive to most of the coolant flowing through the return hole 2011 to the area above the first body 201, and pushing the coolant to flow to the liquid outlet area 2013, thereby reducing turbulence.

[0086] The sum of the areas of all the immersion holes 2015 on the first body 201 is S1, and the sum of the areas of all the return holes 2011 on the first body 201 is S5. The relationship ratio between S1 and S5 can satisfy: 1:2-2:3. For example, the relationship ratio between S1 and S5 can be 1:2, 1:1.92, 1:1.85, 1:1.79, 1:1.72, 1:1.67, 1:1.61, 1:1.56 or 2:3. The immersion holes 2015 are configured to allow the infiltration of coolant to exchange heat with the battery cells 211, thereby improving the cooling uniformity of the entire battery cells 211 and reducing the temperature difference. The total area of ​​the immersion holes 2015 needs to be smaller than the total area of ​​the return holes 2011, which is conducive to the coolant returning to the area above the first body 201 through the return holes 2011 and pushing the coolant to flow to the liquid outlet area 2013, thereby reducing turbulence.

[0087] In this embodiment, the immersion hole 2015 is a circular hole. In other embodiments, the immersion hole 2015 can also be at least one of a semicircular hole, an elliptical hole, a square hole, a polygonal hole, and a special-shaped hole. For example, the first body 201 may have both a circular immersion hole 2015 and a semicircular immersion hole 2015.

[0088] In this embodiment, the return hole 2011 is a semicircular hole, and the arc-shaped hole wall 20111 of the return hole 2011 is located on the side of the plane hole wall 20112 facing the battery cell 211 .

[0089] In one embodiment, a plurality of return holes 2011 are provided on the first body 201 at intervals along the third direction. The number of return holes 2011 matches the number of guide gaps 220 in the battery module 200, and the positions are also arranged in a one-to-one correspondence, i.e., one guide gap 220 corresponds to one return hole 2011. This design ensures that when the return holes 2011 introduce coolant from the bottom of the first body 201 to the top of the first body 201, the coolant can be evenly distributed to the corresponding guide gaps 220 as much as possible, thereby improving the heat exchange and heat dissipation effect of the coolant on each battery cell 211.

[0090] A blocking plate 205 is also provided on the first body 201. The blocking plate 205 is located between the return hole 2011 and the end face of the first body 201 adjacent to the return hole 2011 along the second direction. The length of the blocking plate 205 extends along the third direction, and the blocking plate 205 protrudes from a side surface of the first body 201 where the first guide component 202 is provided (that is, the blocking plate 205 protrudes from the upper side surface of the first body 201). The return hole 2011 is a certain distance away from the end of the first body 201. After the partition 2 is installed on the box body 1, there is still space between the return hole 2011 and the box body 1. If the blocking plate 205 is not provided, when the coolant enters the top of the first body 201 from the return hole 2011, some of the coolant is likely to accumulate in this space and cannot smoothly enter the guide gap 220 of the battery module 200 for heat exchange. Therefore, the provision of the blocking plate 205 can effectively prevent the coolant from stagnating in the space between the hole wall of the return hole 2011 and the box body 1, so that the coolant that enters the top of the first body 201 through the return hole 2011 from the bottom of the first body 201 can all enter the guide gap 220 of the battery module 200 for heat exchange. In one embodiment, the two ends of the blocking plate 205 along the third direction respectively press against the two inner walls of the box body 1 along the third direction. This design is to reduce the phenomenon of coolant stagnating in the areas at the two ends of the blocking plate 205 along the third direction.

[0091] In one embodiment, an inclined blocking plate guide surface 2051 is provided on a side of the blocking plate 205 near the return hole 2011. The blocking plate guide surface 2051 is inclined from an end near the first body 201 toward an end away from the first body 201 and toward the side where the first guide component 202 is located (i.e., an inclined blocking plate guide surface 2051 is provided on a side of the blocking plate 205 near the return hole 2011. The blocking plate guide surface 2051 extends in a first direction from an end near the first body 201 to an end away from the first body 201 and is inclined in a second direction toward a direction near the first guide component 202). The inclined blocking plate guide surface 2051 can guide the coolant drawn out of the return hole 2011 toward the side where the first guide component 202 and the battery module 200 are located, thereby accelerating the entry of the coolant into the guide gap 220. In one embodiment, the side edge of the blocking plate guide surface 2051 near the first body 201 is flush with the planar hole wall 20112 of the return hole 2011. This design ensures that the coolant drawn from the return hole 2011 is fully guided by the blocking plate guide surface 2051, and reduces the resistance to the coolant on the blocking plate 205, thereby accelerating the flow of the coolant.

[0092] Of course, the return hole 2011 is not limited to being a semicircular hole, and can also be at least one of a circular hole, an elliptical hole, a square hole, a polygonal hole, and a special-shaped hole. For example, the first body 201 is provided with both a semicircular return hole 2011 and a circular return hole 2011. In addition, the return hole 2011 is not limited to being multiple, and can also be provided with only one. When only one return hole 2011 is provided, the length of the return hole 2011 can be set to extend along the third direction so that the return hole 2011 can transport coolant to all the guide gaps 220.

[0093] The blocking plate 205 is manufactured separately from the first body 201, with the lower surface of the blocking plate 205 abutting against the upper side of the first body 201. To prevent coolant from entering the abutment area between the blocking plate 205 and the first body 201, a sealing gasket may be provided between the blocking plate 205 and the first body 201. In other embodiments, the blocking plate 205 and the first body 201 may be integrally injection molded, thereby reducing manufacturing difficulty.

[0094] In addition, the blocking plate 205 may also be provided with a hollow structure, and the hollow structure may reduce the weight of the blocking plate 205 and thereby reduce the weight of the entire partition 2 .

[0095] In one embodiment, a second flow guide assembly 203 is provided on the first body 201. The second flow guide assembly 203 is adjacent to the return hole 2011 and is located on the same side of the first body 201 as the first flow guide assembly 202, i.e., the second flow guide assembly 203 is also located on the upper side of the first body 201. The second flow guide assembly 203 includes a plurality of second flow guide grooves 2031, each of which connects the return hole 2011 to the area where the battery module 200 is located. By providing the second flow guide assembly 203, the second flow guide assembly 203 can provide directionality to the coolant drawn from the return hole 2011, maximizing the amount of coolant directed from the return hole 2011 to the battery module 200 for heat dissipation. The provision of the plurality of second flow guide grooves 2031 also serves to disperse the coolant, ensuring that the battery cells 211 at various locations in the battery module 200 are cooled as evenly as possible.

[0096] In this embodiment, the plurality of second guide grooves 2031 correspond one-to-one with the plurality of guide gaps 220. By aligning the positions and numbers of the second guide grooves 2031 with the guide gaps 220, the coolant introduced into the return hole 2011 can be sequentially collected through the second guide grooves 2031, the guide gaps 220, and the first guide grooves 2021 to the liquid outlet area 2013, thereby minimizing the mixing of the coolant in the second guide assembly 203 and thus preventing low local heat exchange efficiency in the battery cell 211.

[0097] In one embodiment, each second guide groove 2031 is connected to a return hole 2011. This design is intended to achieve uniform flow distribution, ensuring a balanced flow rate and temperature of the coolant within each guide gap 220, thereby ensuring uniform heat dissipation of the battery cells 211 within each row of battery cell groups 210. Of course, each second guide groove 2031 is not limited to being connected to only one return hole 2011; each second guide groove 2031 can also be connected to two or more return holes 2011. For all the second guide grooves 2031, the same number of return holes 2011 can be set to connect with each second guide groove 2031, or a different number of return holes 2011 can be set to correspond to the second guide grooves 2031. If the heat generated by the battery cell 211 in the middle of the battery module 200 along the third direction is higher than the battery cells 211 on both sides, the number of return holes 2011 corresponding to the battery cell 211 in the middle can be increased, so that the second guide groove 2031 at this position is connected to more return holes 2011, thereby increasing the coolant flow at this position.

[0098] In this embodiment, the second flow guide assembly 203 includes a plurality of spaced-apart second flow guide plates 2032, with second flow guide grooves 2031 formed between adjacent second flow guide plates 2032. One end of the second flow guide plate 2032 extends to an area adjacent to the battery cell 211. The outwardly projecting second flow guide plates 2032 reduce the overall thickness of the first body 201, reducing the space occupied by the entire separator 2 within the battery case 100, thereby increasing the energy density of the entire battery pack. Furthermore, the area of ​​the battery cell 211 obscured by the first body 201 is reduced, thereby allowing more area of ​​the battery cell 211 to be immersed in the coolant for heat dissipation.

[0099] In one embodiment, the second deflector 2032 and the first body 201 are integrally molded by plastic injection molding. This integral injection molding method can reduce the difficulty of assembling and manufacturing the second deflector 2032, reduce the number of parts, and lower costs. Of course, the second deflector 2032 can also be manufactured separately and then secured to the first body 201 by bonding, welding, screwing, clamping, or other methods.

[0100] In other embodiments, the second guide plate 2032 may not be provided separately, but the thickness of the first body 201 may be increased, and the second guide groove 2031 may be formed by cutting a groove in the first body 201 .

[0101] In one embodiment, as shown in FIG5 (see also FIG1 to FIG3, FIG15 to FIG17, FIG19, and FIG22), the width of the second guide plate 2032 at the end away from the liquid outlet region 2013 is L3, and the width of the second guide plate 2032 at the end adjacent to the liquid outlet region 2013 is L4, where L3 is smaller than L4. By widening the portion of the second guide plate 2032 near the battery cell 211, the flow of coolant within the guide gap 220 into other areas can be minimized. The width of the second guide plate 2032 at the end away from the liquid outlet region 2013 is narrowed to avoid obstruction of the return hole 2011.

[0102] The end face shape of the second guide plate 2032 adjacent to the liquid outlet area 2013 matches the shape of the battery cell 211. This design is to enable the second guide plate 2032 to fit the shape of the battery cell 211 more closely, thereby forming a better guide effect and allowing the coolant in the second guide groove 2031 to enter the guide gap 220 with less resistance.

[0103] In this embodiment, the end surface of the second guide plate 2032 close to the battery cell 211 is an arc surface. Of course, when the battery cell 211 is of other shapes, the shape of the end surface of the second guide plate 2032 close to the battery cell 211 is adjusted according to the shape of the battery cell 211.

[0104] In addition, the end surface of the second guide plate 2032 adjacent to one end of the battery cell 211 is spaced from the outer wall of the battery cell 211. This design can prevent the second guide plate 2032 from directly abutting against the outer wall of the battery cell 211, thereby preventing the second guide plate 2032 from blocking the battery cell 211, allowing the battery cell 211 to be in contact with as much coolant as possible for heat exchange.

[0105] In one embodiment, a liquid inlet pipe 204 is provided on the first body 201. The liquid inlet pipe 204 is fixed to the liquid outlet area 2013. The liquid outlet area 2013 is provided with a through hole 2017 that communicates with the liquid inlet pipe 204. The through hole 2017 extends through the first body 201. The provision of the liquid inlet pipe 204 facilitates the introduction of liquid from the liquid inlet 101 into the area below the first body 201, preventing mixing of the coolant from the liquid inlet 101 and the coolant from the liquid outlet area 2013. After the partition 2 is installed in the box body 1, the area below the partition 2 is first introduced with coolant for heat exchange and heat dissipation. The coolant then enters the area above the partition 2 through the return hole 2011, and then moves from a position near the return hole 2011 to a position near the liquid outlet area 2013 to immerse the battery cells 211 for heat exchange and heat dissipation.

[0106] Of course, the liquid inlet pipe 204 is not limited to being fixed in the liquid outlet area 2013, and can also directly pass through the through hole 2017 and partially extend into the lower area of ​​the first body 201. Alternatively, the liquid inlet pipe 204 may not be provided, and the liquid inlet port 101 may be directly provided in the lower area of ​​the first body 201, that is, the liquid inlet port 101 is directly connected to the lower area of ​​the first body 201.

[0107] Furthermore, the first body 201, first guide plate 2022, second guide plate 2032, and liquid inlet pipe 204 are integrally molded using plastic injection molding. This integral injection molding method offers low manufacturing costs, a reduced number of parts, and ease of assembly. Alternatively, individual components of the first body 201, such as the first guide plate 2022, second guide plate 2032, and liquid inlet pipe 204, can be manufactured separately and then secured to the first body 201 via welding, gluing, screwing, or clamping.

[0108] In one embodiment, first groove groups are provided on both end surfaces of the first body 201 along the third direction. Each first groove group includes a plurality of first grooves 2016 spaced apart along the second direction. The first grooves 2016 are recessed toward the area between two adjacent mounting holes 2012. The provision of the first grooves 2016 can reduce the space at both ends of the first body 201 along the third direction. This is because the width of the guide gaps 220 between adjacent battery cell groups 210 is uniform when the battery cells 211 are the same size. However, if the guide gaps 220 on both sides of the battery module 200 along the third direction are not provided with the first grooves 2016, the guide gaps 220 will have inconsistent widths. This will result in inconsistent cooling effects on the battery cells 211 on both sides of the battery module 200 and the battery cell 211 in the middle. In one embodiment, the first groove 2016 is an arc-shaped groove, and two adjacent first grooves 2016 are connected by the arc-shaped first protrusion 2014, so that the end surface of the first body 201 along the third direction forms a wavy surface.

[0109] 12 to 16 (some of the reference numerals are the same as those in FIG1 to 3 and FIG17 to 22), the embodiment of the present application further provides a battery case 100, which includes a case body 1, a receiving cavity is provided in the case body 1, and the battery case 100 further includes a partition 2 provided in the embodiment of the present application, the partition 2 is provided in the case body 1, and divides the receiving cavity into a first chamber 103 and a second chamber 104 that are independent of each other. The first guide component 202, the second guide component 203, and the blocking plate 205 on the partition 2 are all located in the first chamber 103, the liquid inlet 101 is connected to the second chamber 104, the battery cell 211 is fixed in the mounting hole 2012 of the first body 201, and one end of the battery cell 211 extends into the mounting hole 2012 of the first body 201. To the first chamber 103, the other end extends into the second chamber 104, the liquid inlet 101 sends the coolant into the second chamber 104, and the coolant flows from the end of the second chamber 104 where the first guide component 202 is located close to the partition 2 to the end where the return hole 2011 is located to immerse the battery cell 211 for heat exchange and heat dissipation, and then enters the first chamber 103 through the return hole 2011. Under the guidance of the blocking plate guide surface 2051 of the blocking plate 205, the coolant is diverted to the second guide groove 2031 of each second guide component 203, and then passes through the guide gap 220 of the battery module 200 and the first guide groove 2021 after being collected in the liquid outlet area 2013, and finally discharged through the liquid outlet 102.

[0110] This battery box 100 is separated by the partition 2 to form an independent first chamber 103 and a second chamber 104. Under the joint action of the first guide component 202, the second guide component 203, the blocking plate 205 and the return hole 2011 on the partition 2, the battery cell 211 is effectively heat-exchanged and dissipated, thereby avoiding aging of local battery cells 211 due to uneven heat dissipation and extending the service life of the entire battery module 200.

[0111] In addition, when the battery cell 211 is installed in the mounting hole 2012, it is fixed and sealed by sealant to prevent the battery cell 211 from shifting on the partition 2. It can also prevent the coolant in the area above the partition 2 (i.e., the coolant in the first chamber 103) from entering the area below the partition 2 (i.e., the second chamber 104) through the gap between the battery cell 211 and the hole wall of the mounting hole 2012, effectively preventing the coolant from mixing.

[0112] In other embodiments, the first direction is not limited to being a vertical direction, and the first direction may also be set to a horizontal direction, that is, when the battery case 100 is placed upright, the first direction is the horizontal direction. Moreover, it is not limited to setting the second direction to be the length direction of the battery case 100 and the third direction to be the width direction of the battery case 100. The second direction may also be set to the width direction of the battery case 100 and the third direction to be the length direction of the battery case 100. The specific direction limitations are not repeated here.

[0113] 17 to 22 , an embodiment of the present application further provides a battery pack, including a battery case 100 and a battery module 200 . The battery case 100 is provided with a receiving cavity, and the battery module 200 is disposed within the receiving cavity. The specific structure of the battery case 100 is not further described.

[0114] As shown in Figures 6 to 8 (refer to Figures 15 to 17, Figure 19 and Figure 22), an embodiment of the present application provides a tray 3, which is applied to the battery box 100. In this embodiment, the first direction is the vertical direction, the second direction is the length direction of the battery box 100, that is, the length direction of the tray 3, and the third direction is the width direction of the battery box 100, that is, the width direction of the tray 3.

[0115] In this embodiment, the tray 3 includes a second body 301, a third guide assembly 302 and a guide plate 303, wherein the second body 301 is provided with a liquid inlet area 3011, the liquid inlet area 3011 is provided to be connected to the liquid inlet 101 of the battery box 100, the liquid inlet area 3011 is provided on the upper side of the second body 301 along the first direction, the third guide assembly 302 is also located on the upper side of the second body 301 along the first direction, the third guide assembly 302 includes a plurality of third guide grooves 3021, all of the third guide grooves 3021 are provided. One end of the guide groove 3021 is connected to the liquid inlet area 3011, and the other end is connected to the area where the battery module 200 is located. The third guide component 302 is configured to disperse and guide the coolant in the liquid inlet area 3011 to the battery module 200. The guide plate 303 is also located on the upper side of the second body 301 along the first direction, and the guide plate 303 and the third guide component 302 are respectively adjacent to the two ends of the second body 301 along the second direction. A guide surface 3031 is provided on one side of the guide plate 303 close to the third guide component 302.

[0116] The tray 3 of this embodiment is provided with a liquid inlet area 3011 and a third guide component 302. The liquid inlet area 3011 is configured to receive coolant from the liquid inlet 101 of the battery case 100. The third guide component 302 disperses the coolant in the liquid inlet area 3011 and guides it to the battery module 200, so that the battery module 200 can be more evenly immersed in the coolant for heat exchange and heat dissipation, thereby improving the heat dissipation effect of the battery module 200. A guide plate 303 is provided, and the guide plate 303 can guide the coolant after heat exchange with the battery module 200 to other areas for heat exchange or to the outside of the battery case 100, thereby ensuring that heat exchange in other areas can proceed smoothly and reducing the probability of coolant flowing back to the battery module 200 that has already been heat exchanged.

[0117] In this embodiment, the drainage surface 3031 is a curved surface that is concave toward the side away from the third flow guide component 302. By setting the drainage surface 3031 as a concave curved surface, the resistance of the coolant at the drainage surface 3031 can be reduced, ensuring that the coolant can be quickly drained to other areas for heat exchange or drained to the outside of the battery case 100. Of course, the drainage surface 3031 is not limited to being a concave curved surface, but can also be a slope. In one embodiment, the drainage surface 3031 is inclined from the end close to the second body 301 toward the end away from the second body 301 and toward the side away from the third flow guide component 302, that is, the drainage surface 3031 is inclined from bottom to top toward the side away from the third flow guide component 302. The inclined drainage surface 3031 can also reduce the resistance of the coolant.

[0118] In one embodiment, the battery module 200 has multiple rows of battery cell groups 210 arranged along the third direction, each row of battery cell groups 210 includes multiple battery cells 211 arranged along the second direction, and a guide gap 220 is formed between at least two adjacent rows of battery cell groups 210. The multiple third guide grooves 3021 correspond one-to-one to the multiple guide gaps 220. By arranging the guide gaps 220 between the battery cell groups 210 in one-to-one correspondence with the third guide grooves 3021, when the externally cooled coolant enters the liquid inlet area 3011, it can be diverted through the third guide grooves 3021, and the guide gaps 220 corresponding to and connected to the third guide grooves 3021 can receive the diverted coolant, thereby increasing the chance of each battery cell 211 in each row of battery cell groups 210 coming into contact with the coolant, and the cooling temperature is also more uniform. The coolant after heat exchange is then guided to other areas through the guide surface 3031 for heat exchange or diversion to the outside of the battery case 100, thereby reducing the backflow or mixed flow of the coolant after heat exchange between two adjacent rows of battery cell groups 210 to other rows of battery cell groups 210, thereby avoiding the situation where the battery cell 211 has low local heat exchange efficiency.

[0119] In one embodiment, both end surfaces of the second body 301 along the third direction are spaced from the outer sidewalls of the battery module 200, so that a guide gap 220 is also formed on both sides of the battery module 200 along the third direction. In one embodiment, during installation, the two sides of the battery module 200 along the third direction do not directly abut the inner sidewalls of the battery case 100. This is because it is necessary to avoid the situation where the battery cells 211 are partially unable to be immersed in the coolant and thus have poor heat dissipation. The guide gap 220 formed on both sides of the battery module 200 along the third direction also corresponds to a third guide groove 3021. The coolant entering the liquid inlet area 3011 can also enter the guide gap 220 on both sides of the battery module 200 along the third direction through the third guide groove 3021 at this position, ensuring that each battery cell 211 can be immersed in the coolant for heat exchange and heat dissipation, thereby ensuring uniform heat exchange among all battery cells 211.

[0120] In one embodiment, the third guide assembly 302 includes a plurality of spaced-apart third guide plates 3022, with third guide grooves 3021 formed between adjacent third guide plates 3022. One end of the third guide plate 3022 extends to the liquid inlet area 3011, and the other end extends to an area adjacent to the battery module 200. The outwardly projecting third guide plates 3022 can reduce the overall thickness of the second body 301, thereby reducing the space occupied by the entire tray 3 within the battery case 100 and improving the energy density of the entire battery pack.

[0121] In one embodiment, the third deflector 3022 and the second body 301 are integrally molded by plastic injection molding. This integral injection molding method can reduce the difficulty of assembling and manufacturing the third deflector 3022, reduce the number of parts, and lower costs. Of course, the third deflector 3022 can also be manufactured separately and then secured to the second body 301 by bonding, welding, screwing, clamping, or other methods.

[0122] In other embodiments, a separate third guide plate 3022 may not be provided, and the thickness of the second body 301 may be increased, and a groove 3021 may be formed on the second body 301. This design requires that the battery cell 211 be at least partially embedded in the second body 301 so that the third guide groove 3021 can effectively disperse and drain the coolant.

[0123] In one embodiment, as shown in FIG9 (see also FIG6 to FIG8 , FIG15 to FIG17 , FIG19 , and FIG22 ), the width of the third guide plate 3022 at the end adjacent to the liquid inlet region 3011 is L5, and the width of the third guide plate 3022 at the end adjacent to the battery cell 211 is L6, where L5 is smaller than L6. By widening the portion of the third guide plate 3022 adjacent to the battery cell 211, the flow of coolant from the guide gap 220 into other areas can be minimized. The narrowing of the end of the third guide plate 3022 adjacent to the liquid inlet region 3011 is intended to create a convergence effect. Because the liquid inlet region 3011 is generally designed to be smaller than the width of the battery module 200 (i.e., the dimension of the battery module 200 along the third direction), the third guide assembly 302 needs to be tightened to facilitate smooth flow of coolant from the liquid inlet region 3011 into all third guide grooves 3021.

[0124] The shape of the end face of the third guide plate 3022 adjacent to the battery cell 211 matches the outer shape of the battery cell 211. This design allows the third guide plate 3022 to more closely conform to the shape of the battery cell 211, resulting in a better diversion effect and allowing the coolant in the third guide groove 3021 to enter the diversion gap 220 with less resistance. In this embodiment, the battery cell 211 is a cylindrical battery cell, and the end face of the third guide plate 3022 adjacent to the battery cell 211 is a curved surface. Of course, the battery cell 211 is not limited to a cylindrical shape and can also be square, polygonal, or irregularly shaped. In this case, the shape of the end face of the third guide plate 3022 adjacent to the battery cell 211 can be adjusted according to the outer shape of the battery cell 211.

[0125] In addition, the end surface of the third guide plate 3022 adjacent to one end of the battery cell 211 is spaced from the outer wall of the battery cell 211. This design can prevent the third guide plate 3022 from directly abutting against the outer wall of the battery cell 211, thereby preventing the third guide plate 3022 from blocking the battery cell 211, allowing the battery cell 211 to be in contact with the coolant as much as possible for heat exchange.

[0126] In one embodiment, a diverter 304 is protruding from the second body 301 and is located in the liquid inlet area 3011. The diverter 304 can divert the coolant delivered from the liquid inlet 101, preventing the coolant from being locally accelerated and flowing toward a particular third guide groove 3021. The diverter 304 first diverts the coolant, and the diverted coolant is then substantially evenly delivered to each third guide groove 3021. This ensures that each guide gap 220 receives coolant at the same temperature and with a substantially consistent flow rate, ensuring the same cooling effect for each battery cell 211, reducing temperature differences within the battery cells 211, and extending the service life of the entire battery module 200.

[0127] In this embodiment, the outer wall of the diverter 304 is at least partially curved, and the cross-sectional dimensions of the end of the diverter 304 away from the second body 301 are smaller than the cross-sectional dimensions of the end of the diverter 304 connected to the second body 301. Providing a curved outer wall of the diverter 304 can reduce splashing of coolant delivered from the liquid inlet 101 at the diverter 304, ensuring that the coolant adheres to the outer wall of the diverter 304 for diversion. The structure of a smaller upper end and a larger lower end achieves a better diversion effect, and the lower end of the diverter 304 forms a dispersed structure, ensuring uniform diversion of the coolant.

[0128] In one embodiment, as shown in FIG24 (referring to FIG1 to FIG22 ), the two outermost third guide plates 3022 along the third direction are third outer guide plates 30221, and the two third outer guide plates 30221 are connected at one end away from the battery cell 211, and the remaining third guide plates 3022 are third inner guide plates 30222, and the end of the third inner guide plate 30222 away from the battery cell 211 is separated from the inner side wall of the third outer guide plate 30221 to form a liquid inlet area 3011, and the diverter 304 includes a diverter outer peripheral surface 3042, a diverter bottom surface 3043 and a diverter top surface 3041, and the diverter top surface The diverter 3041 and the diverter bottom surface 3043 are spaced apart along a first direction. The diverter outer peripheral surface 3042 connects the diverter top surface 3041 and the diverter bottom surface 3043. The diverter bottom surface 3043 is connected to the second body 301. The diverter top surface 3041 is smaller than the diverter bottom surface 3043. The diverter outer peripheral surface 3042 includes a connecting surface 30421 and a diverter guide surface 30422 that are interconnected along the circumference of the diverter 304. The connecting surface 30421 is connected to the inner side surface of the third outer guide plate 30221. The diverter guide surface 30422 is a conical surface and faces the third inner guide plate 30222. The structure of the diverter 304 is actually the structure of half of a cone cut in half along its own central axis. By setting the diversion outer peripheral surface 3042 of the diverter member 304 as a structure connecting the connecting surface 30421 and the diversion guide surface 30422, the connecting surface 30421 can be connected to the third outer guide plate 30221 (the connecting surface 30421 is not exposed after the connection), and the diversion guide surface 30422 of the conical structure is exposed on the diverter member 304, and the conical structure is used to divert the coolant from top to bottom. The conical structure minimizes the resistance and splashing of the coolant, ensuring that the coolant gradually disperses along the conical structure from the smaller diversion top surface 3041 to the larger diversion bottom surface 3043, and the dispersed coolant then enters the third guide groove 3021. At this time, the coolant will be more evenly distributed in each third guide groove 3021.

[0129] In one embodiment, the second body 301 is provided with a plurality of mounting grooves 3012 for securing the battery cells 211. The mounting grooves 3012 facilitate securing the lower ends of the battery cells 211 to the tray 3, simplifying securing the battery cells 211 and preventing displacement of the battery cells 211. In one embodiment, the battery cells 211 are bonded to the mounting grooves 3012 using a sealant.

[0130] A first pressure relief hole 3013 is provided at the bottom of the mounting groove 3012, and the first pressure relief hole 3013 extends through the second body 301. By providing the first pressure relief hole 3013 at the bottom of the mounting groove 3012, when a battery cell 211 fails, the electrolyte and other substances ejected from the battery cell 211 during pressure relief can be discharged through the first pressure relief hole 3013 to the bottom of the tray 3, that is, the side of the tray 3 away from the coolant. This prevents the electrolyte and other substances from contaminating the coolant and prevents the failed battery cell 211 from affecting the remaining adjacent battery cells 211. In this embodiment, since the battery cell 211 is bonded to the mounting groove 3012 by sealant, the sealant bonding position also serves as a seal, preventing the coolant from leaking from the upper area of ​​the tray 3 to the lower area of ​​the tray 3.

[0131] In one embodiment, a second groove group is provided on both end surfaces of the second body 301 along the third direction. Each second groove group includes a plurality of second grooves 3014 spaced apart along the second direction. The second grooves 3014 are recessed into the area between two adjacent mounting grooves 3012. The provision of the second grooves 3014 reduces the space required at both ends of the second body 301 along the third direction. This is because the width of the flow-guiding gaps 220 between adjacent battery cell groups 210 is uniform when the battery cells 211 are of the same size. However, if the flow-guiding gaps 220 on either side of the battery module 200 along the third direction are not provided with the second grooves 3014, the widths of the flow-guiding gaps 220 would be inconsistent. This would result in inconsistent cooling effects on the battery cells 211 on both sides of the battery module 200 and the center. In one embodiment, the second grooves 3014 are arc-shaped, with two adjacent second grooves 3014 connected by an arc-shaped second protrusion 3016, thereby forming a wavy surface on the end surface of the second body 301 along the third direction.

[0132] In one embodiment, a circle of connecting protrusions 305 protrude in an annular manner around the circumference of the second body 301. The connecting protrusions 305 and the third guide assembly 302 are located on the same side of the second body 301, that is, the connecting protrusions 305 protrude from the upper side of the second body 301. The connecting protrusions 305 are recessed with a card slot 3051 configured to snap onto the case body 1 of the battery case 100. By providing the connecting protrusions 305 and the card slot 3051, the tray 3 and the case body 1 can be manufactured separately and then connected by assembly, which can reduce the difficulty of manufacturing. During the specific assembly, a sealant can be provided in the card slot 3051, and the lower end of the case body 1 can be inserted into the card slot 3051 and bonded and fixed by the sealant. After bonding, the case body 1 and the tray 3 are also sealed by the sealant to prevent leakage of the coolant.

[0133] In other embodiments, the connection between the box body 1 and the connecting protrusion 305 and the card slot 3051 is not limited. As shown in Figures 10 and 11, the tray 3 can also be directly welded to the box body 1, or the tray 3 and the box body 1 can be integrally injection molded or integrally cast.

[0134] Referring to Figures 12 to 16 (some figure numbers are the same as Figures 6 to 8 and Figures 17 to 22), an embodiment of the present application also provides a battery case 100, which includes a case body 1, and a accommodating cavity is arranged in the case body 1. The battery case 100 also includes a tray 3 provided in an embodiment of the present application, and an opening 1014 is provided at the lower end of the case body 1, and the tray 3 blocks the opening 1014. The liquid inlet area 3011, the third guide component 302, the guide plate 303, and the diverter 304 on the tray 3 are all arranged in the accommodating cavity. A liquid inlet 101 and a liquid outlet 102 are also provided on the case body 1, and the liquid inlet 101 and the liquid outlet 102 are both connected to the accommodating cavity, wherein the liquid inlet 101 is arranged opposite the diverter 304 of the tray 3. After the coolant enters the body 1 of the battery box 100 from the liquid inlet 101, it is first diverted through the diverter 304, and then diverted through multiple third guide grooves 3021. The coolant entering the third guide groove 3021 enters the guide gap 220 of the battery module 200 and then gathers at the guide plate 303. Finally, it is drained to other areas of the box body 1 through the guide surface 3031 or directly discharged through the liquid outlet 102.

[0135] This battery box 100 can effectively exchange and dissipate heat for each battery cell 211 of the battery module 200 through the diversion, diversion and drainage of the tray 3, avoiding aging of local battery cells 211 due to uneven heat dissipation, and extending the service life of the entire battery module 200.

[0136] In other embodiments, the first direction is not limited to being a vertical direction, and the first direction may also be set to a horizontal direction, that is, when the battery case 100 is placed upright, the first direction is the horizontal direction. Moreover, it is not limited to setting the second direction to be the length direction of the battery case 100 and the third direction to be the width direction of the battery case 100. The second direction may also be set to the width direction of the battery case 100 and the third direction to be the length direction of the battery case 100. The specific direction limitations are not repeated here.

[0137] 17 to 22 , an embodiment of the present application further provides a battery pack, including a battery case 100 and a battery module 200 . The battery case 100 is provided with a receiving cavity, and the battery module 200 is disposed within the receiving cavity. The specific structure of the battery case 100 is not further described.

[0138] As shown in Figures 12 to 16 (refer to Figures 1 to 3, Figures 6 to 8, and Figures 17 to 22), an embodiment of the present application provides a battery case 100. In this embodiment, the first direction is the vertical direction, the second direction is the length direction of the battery case 100, and the third direction is the width direction of the battery case 100.

[0139] The following is an example of a cylindrical battery cell 211 of a battery module 200 installed in a battery case 100. The battery cell 211 is not limited to a cylindrical battery cell 211, but can also be square, polygonal or irregularly shaped. The specific structure of the battery cell 211 is not limited, and part of the structure of the battery case 100 is adaptively adjusted according to the shape of the battery cell 211, which will not be repeated here.

[0140] In this embodiment, the battery box 100 includes a box body 1 and a partition 2, wherein the box body 1 is provided with a liquid inlet 101 and a liquid outlet 102 at intervals, and the box body 1 is provided with a receiving cavity configured to accommodate the battery module 200, and the partition 2 is provided in the receiving cavity, and the partition 2 divides the receiving cavity into a first chamber 103 and a second chamber 104 distributed along a first direction, wherein the first chamber 103 is located above the second chamber 104, and the partition 2 is provided with a plurality of mounting holes 2012 configured to install the battery cell 211 of the battery module 200, and the two ends of the battery cell 211 extend to the first chamber 1 respectively. 03 and the second chamber 104, a reflux hole 2011 is opened on the partition 2, the partition 2 has a liquid outlet area 2013 connected with the liquid outlet 102, the liquid outlet area 2013 is located in the first chamber 103, the liquid outlet area 2013 and the reflux hole 2011 are respectively adjacent to the two ends of the partition 2 along the second direction, the liquid outlet 102 is connected to the liquid outlet area 2013, the second chamber 104 has a liquid inlet area 3011, the liquid inlet area 3011 and the liquid outlet area 2013 are located at the same end of the box body 1 along the second direction, the liquid inlet 101 is connected to the liquid inlet area 3011, and the first direction and the second direction are set at an angle.

[0141] The battery box 100 of the embodiment of the present application uses a partition 2 to separate the accommodating cavity in the box body 1 into an independent first chamber 103 and a second chamber 104. After the partition 2 is installed with the battery cell 211, the two chambers are relatively sealed. The coolant first enters the liquid inlet area 3011 of the second chamber 104 from the liquid inlet 101, and then immerses the portion of the battery cell 211 located in the second chamber 104 in sequence from the end close to the liquid inlet area 3011 toward the end away from the liquid inlet area 3011 along the second direction, performs heat exchange and heat dissipation on the battery cell 211, and then enters the first chamber 103 through the reflux hole 2011 on the partition 2, and then flows out of the reflux hole 2011. The side where 2011 is located faces the liquid outlet area 2013 and immerses the part of the battery cell 211 located in the first chamber 103 in turn, and performs heat exchange on the remaining part of the battery cell 211. The coolant after the heat exchange is completed is collected in the liquid outlet area 2013 and then discharged through the liquid outlet 102. During the whole process, the coolant performs step-by-step heat exchange on the battery cell 211 of the battery module 200. The special infiltration path of the coolant (similar to the U-shaped infiltration path, that is, the path indicated by the arrow in Figure 22) increases the probability of each battery cell 211 contacting the coolant, thereby improving the heat exchange uniformity and effect of all battery cells 211 and extending the service life of the battery cell 211.

[0142] In this embodiment, the battery module 200 has multiple rows of cell groups 210 arranged along the third direction. Each row of cell groups 210 includes multiple cells 211 arranged along the second direction, and adjacent rows of cell groups 210 are staggered. This design allows for a more compact arrangement of the battery modules 200, ensuring greater space utilization within the battery case 100. The resulting battery pack, formed by assembling the battery modules 200, has a higher energy density.

[0143] The battery box 100 may be provided with only a partition 2 . The specific structure of the partition 2 is the same as that described in the embodiment of the present application, and the specific structure of the partition 2 will not be repeated here.

[0144] The battery box 100 can also be provided with both a partition 2 and a tray 3. In one embodiment, the tray 3 is connected to the box body 1, and the tray 3 is separated from the partition 2 to form a second chamber 104 therebetween, that is, the tray 3 is installed at the bottom of the second chamber 104, and the specific structure of the partition 2 is the same as that described in the embodiment of the present application, and the specific structure of the tray 3 is the same as that described in the embodiment of the present application. The specific structures of the partition 2 and the tray 3 are not repeated here.

[0145] The following description will be made by taking the battery box 100 provided with both the partition plate 2 and the tray 3 as an example.

[0146] The partition 2 is fixed to the middle of the battery cell 211 along the first direction (ie, the middle in the vertical direction). At this time, the lengths of the battery cell 211 in the first chamber 103 and the second chamber 104 are the same.

[0147] In this embodiment, the height of the second chamber 104 along the first direction is H1, the liquid level of the coolant in the accommodating chamber along the first direction is H2, and the size of the battery cell 211 along the first direction is H3. The relationship ratio of H1, H2, and H3 can satisfy 2:5:5 or 1:4:4. This relationship ratio design makes the height of the second chamber 104 lower than the height of the first chamber 103, which is conducive to accelerating the flow rate of the coolant in the second chamber 104, thereby accelerating the flow of coolant to the first chamber 103 to cool the battery cell 211, and improving the overall heat exchange efficiency of the battery cell 211. In other embodiments, it is not limited to setting the height of the second chamber 104 to be less than the height of the first chamber 103. The height of the second chamber 104 can also be set to be the same as the height of the first chamber 103, that is, the partition 2 is located in the middle of the box body 1 along the first direction, so that the height of the first chamber 103 and the second chamber 104 are consistent.

[0148] The liquid inlet 101 and the liquid outlet 102 are located on the same side of the case body 1 along the first direction and are close to the first chamber 103. Furthermore, the liquid inlet 101 and the liquid outlet 102 are both adjacent to the end where the liquid outlet area 2013 is located. By arranging the liquid inlet 101 and the liquid outlet 102 on the same side of the case body 1 along the first direction, that is, by arranging them on the upper or lower side of the battery case 100, the liquid inlet 101 and the liquid outlet 102 are prevented from occupying the horizontal space of the battery case 100, making the battery case 100 more compact and improving space utilization. By arranging both the liquid inlet 101 and the liquid outlet 102 at the end adjacent to the liquid outlet area 2013, the length of the piping within the battery case 100 can be shortened, saving costs and reducing the space occupancy within the battery case 100. In one embodiment, the liquid inlet 101 and the liquid outlet 102 are located on the upper side of the battery case 100. This design enables the liquid to flow downstream into the second chamber 104 located below. After the coolant in the second chamber 104 fills the entire second chamber 104, it is immersed into the first chamber 103 through the reflux hole 2011.

[0149] In other embodiments, the liquid inlet 101 and the liquid outlet 102 are not limited to being arranged on the same side of the box body 1, but can also be arranged on different sides. For example, the liquid inlet 101 is arranged on the lower side of the battery box 100, and the liquid outlet 102 is arranged on the upper side of the battery box 100, or the liquid inlet 101 and the liquid outlet 102 are arranged on the left and right or front and back sides of the battery box 100.

[0150] In one embodiment, the battery case 100 further includes a first sealing plate 4 and a second sealing plate 5, and openings 1014 are provided at both ends of the case body 1 along the first direction, wherein the lower end of the case body 1 along the first direction is sealed by the tray 3, and a pressure relief groove 3015 is recessed on the side of the tray 3 away from the partition 2, and a plurality of mounting grooves for clamping the battery cells are provided on the tray, and a first pressure relief hole 3013 is provided at the bottom of the mounting groove (that is, a first pressure relief hole 3013 is provided on each battery cell 211 on the tray 3), and the first pressure relief hole 3013 is communicated with the pressure relief groove 3015, and a first sealing plate 4 is connected to the side of the tray away from the partition, and the first sealing plate 4 blocks the notch of the pressure relief groove 3015, and the opening 1014 at the upper end of the case body 1 along the first direction is sealed by the second sealing plate 5 to form a sealed battery case 100. By setting the pressure relief groove 3015, the first pressure relief hole 3013 of the tray 3 can be connected, and the first pressure relief hole 3013 corresponds to the position of the battery cell 211. When the battery cell 211 fails and needs pressure relief, the electrolyte and other substances sprayed from the battery cell 211 can enter the pressure relief groove 3015 through the first pressure relief hole 3013. The first sealing plate 4 is set to avoid the pressure relief groove 3015 from being exposed, to ensure that the pressure relief groove 3015 can store and seal the electrolyte and other substances sprayed from the battery cell 211, thereby preventing adjacent battery boxes 100 from affecting each other and avoiding environmental pollution. By setting the opening 1014 and the second sealing plate 5, the installation of components such as the partition 2 and the battery module 200 is facilitated, and the later maintenance of components in the battery box 100 is also facilitated.

[0151] In one embodiment, a plurality of struts 306 are provided protruding from the bottom of the pressure relief groove 3015. The struts 306 are located between adjacent first pressure relief holes 3013. The ends of the struts 306, which are away from the bottom of the pressure relief groove 3015, abut against the inner side of the first sealing plate 4. The struts 306 support the first sealing plate 4 and prevent deformation of the first sealing plate 4.

[0152] The upper end of the box body 1 along the first direction is provided with an opening 1014 that communicates with the accommodating cavity. A mounting portion 1010 is formed at the end of the box body, extending toward the center of the opening 1014. The second sealing plate 5 is connected to the mounting portion 1010 to seal the opening 1014. The provision of the mounting portion 1010 creates a convenient location for the installation of the second sealing plate 5 on the upper side of the box body 1. In one embodiment, the mounting portion 1010 includes a sealing groove 1011 formed around the perimeter of the opening 1014. Sealant is disposed within the sealing groove 1011, and the second sealing plate 5 is connected to the mounting portion 1010 via the sealant. In one embodiment, a circle of steps 1012 is provided in an annular manner on the inner side wall of the mounting portion 1010, and the steps 1012 are spaced apart from a side surface of the mounting portion 1010 away from the accommodating cavity (i.e., the steps 1012 are recessed, and the upper side surface of the steps 1012 is spaced apart from the upper side surface of the mounting portion 1010), and the second sealing plate 5 abuts against the steps 1012, and the sealing groove 1011 is provided on the steps 1012. By providing the steps 1012, the installation position of the second sealing plate 5 can be limited to ensure that the second sealing plate 5 can accurately seal the opening 1014, and can also effectively prevent the second sealing plate 5 from shifting. In addition to fixing the second sealing plate 5 by bonding, the second sealing plate 5 can also be fixed by screws in combination with a sealing ring, or by a snap-on structure in combination with a sealing ring. The detachable connection facilitates the disassembly of the second sealing plate 5, thereby facilitating the installation and maintenance of the battery module 200 in the battery case 100.

[0153] In this embodiment, the liquid inlet 101 and the liquid outlet 102 are arranged on the mounting portion 1010, and a liquid inlet connector 6 is provided on the mounting portion 1010 corresponding to the liquid inlet 101, and a liquid outlet connector 7 is provided corresponding to the liquid outlet 102. The liquid inlet connector 6 and the liquid outlet connector 7 are used to connect external pipes to achieve cooling by coolant circulation. Moreover, the liquid inlet 101 and the liquid outlet 102 are both provided on the mounting portion 1010, which can also avoid obstruction and pulling of the pipes when disassembling and assembling the second sealing plate 5. The liquid inlet connector 6 and the liquid outlet connector 7 can be in the form of quick-disconnect connectors to achieve rapid disassembly and assembly of the pipes. In other embodiments, the liquid inlet 101 and the liquid outlet 102 can also be provided on the second sealing plate 5, or the liquid inlet 101 and the liquid outlet 102 can be provided on the mounting portion 1010 and the second sealing plate 5, respectively.

[0154] Furthermore, the liquid inlet 101 communicates with the second chamber 104 via a liquid inlet pipe 204, which is disposed within the first chamber 103. A through-hole 2017 is provided on the partition 2, communicating with the liquid inlet pipe 204. The through-hole 2017 extends through the partition 2. To facilitate maintenance and prevent leakage, the liquid inlet pipe 204 can be directly secured to the partition 2. In other embodiments, the liquid inlet pipe 204 can be provided separately. After the partition 2 is installed, the ends of the liquid inlet pipe 204 are respectively secured to the mounting portion 1010 and the partition 2. In addition, the liquid inlet pipe 204 can also be directly passed through the through hole 2017, that is, a part of the liquid inlet pipe 204 is located in the first chamber 103 and is tightly pressed against the position of the liquid inlet 101 corresponding to the mounting portion 1010, and the other part extends into the second chamber 104. At this time, it is necessary to seal the outer wall of the liquid inlet pipe 204 and the hole wall of the through hole 2017 to prevent the coolant in the first chamber 103 from entering the second chamber 104 through the gap between the outer wall of the liquid inlet pipe 204 and the hole wall of the through hole 2017.

[0155] In one embodiment, the box body 1 has a first side plate 105 and a second side plate 106 distributed along a third direction, and the inner sides of the first side plate 105 and the second side plate 106 are provided with a plurality of third grooves 107 spaced along the second direction. The shape of the third groove 107 matches the shape of the outer wall of the battery cell 211 on the outer side of the battery module 200 along the third direction, and the outer wall of the battery cell 211 is spaced from the groove wall of the third groove 107. A protruding structure 108 is formed between two adjacent third grooves 107. The protruding structure 108 is inserted in the area between two adjacent battery cells 211 along the second direction, and the protruding structure 108 is spaced from the outer wall of the battery cell 211. The two end faces of the partition 2 along the third direction are respectively pressed against and sealed against the inner walls of the first side plate 105 and the second side plate 106. Therefore, the shape of the two end faces of the partition 2 along the third direction matches the shape of the first side plate 105 and the second side plate 106. In one embodiment, a first protrusion 2014 is provided on the end surface of the partition 2 along the third direction corresponding to the third groove 107, and a first groove 2016 is provided on the end surface of the partition 2 along the third direction corresponding to the protrusion structure 108. The outer wall of the first protrusion 2014 presses against the groove wall of the third groove 107, and the outer wall of the protrusion structure 108 presses against the groove wall of the first groove 2016, forming a fitting and tight structure to ensure the sealing of the connection position between the partition 2 and the first side plate 105 and the second side plate 106 of the box body 1.

[0156] The first and second side panels 105, 106 are corrugated plates, with grooves 109 formed on their outer surfaces corresponding to the protrusions 108. The partition 2 has corrugated surfaces at both ends along the third direction. By configuring the first and second side panels 105, 106 as corrugated plates, space within the battery case 100 in the third direction can be reduced.

[0157] In order to facilitate the assembly of the battery cell 211, in addition to utilizing the restriction of the partition 2, an installation groove 3012 can also be set on the tray 3. The number and layout of the installation grooves 3012 are opened according to the number and layout of the battery cells 211 of the battery module 200. The lower end of the battery cell 211 is inserted into this installation groove 3012, and the first pressure relief hole 3013 is opened at the bottom of the installation groove 3012 and penetrates the second body 301 of the tray 3 along the first direction (that is, penetrates the thickness direction of the second body 301). In order to prevent the coolant from leaking from the outer wall of the battery cell 211 and the groove wall of the installation groove 3012 to the side of the tray 3 away from the second chamber 104 after the battery cell 211 is assembled with the tray 3 (that is, to prevent the coolant from leaking to the outer bottom of the tray 3), a sealant is set between the groove wall of the installation groove 3012 and the outer wall of the battery cell 211.

[0158] The housing body 1 is provided with a second pressure relief hole 1013, which connects the pressure relief groove 3015 with the exterior of the housing body 1. The provision of the second pressure relief hole 1013 allows electrolyte and other substances generated by the pressure relief of the battery cells 211 within the pressure relief groove 3015 to be discharged to the exterior of the housing body 1. In one embodiment, the second pressure relief hole 1013 is provided on one of the side surfaces of the housing body 1 along the second direction. In other embodiments, the second pressure relief hole 1013 is not limited to being provided on the side surface of the housing body 1 along the second direction; it may also be provided on the side surface of the housing body 1 along the third direction (i.e., on the first side panel 105 and / or the second side panel 106).

[0159] In one embodiment, the projection of the return holes 2011 on the partition 2 along the first direction at least partially overlaps with the drainage surface 3031 of the drainage plate 303 of the tray 3. This design allows the coolant directed upward from the drainage surface 3031 to pass through the return holes 2011 as quickly as possible into the first chamber 103, reducing the time the coolant remains in the second chamber 104 and accelerating the circulation of the coolant. In one embodiment, the projection of the return holes 2011 along the first direction completely overlaps with the drainage surface 3031.

[0160] In one embodiment, the tray 3 is fixedly connected to the box body 1. This fixed connection reduces assembly difficulty and prevents coolant leakage at the connection between the tray 3 and the box body 1. In one embodiment, the tray 3 and the box body 1 are integrally formed. This integral molding method is simple to operate, eliminates joint gaps, and effectively prevents leakage. In one embodiment, the tray 3 and the box body 1 are integrally injection molded.

[0161] Of course, the tray 3 is not limited to being fixedly connected to the box body 1; the tray 3 and the box body 1 can also be detachably connected. In one embodiment, a slot 3051 is provided on the tray 3, and one end of the box body 1 along the first direction is inserted into the slot 3051. A sealant is provided in the slot 3051, which bonds the box body 1 and the tray 3 and seals the connection between the box body 1 and the tray 3. The sealant is selected to not only achieve a fixed connection but also a good seal. In one embodiment, a ring of connecting protrusions 305 is provided on the upper surface of the tray 3, and the slots 3051 are provided on the connecting protrusions 305.

[0162] As shown in Figures 17 to 22 (some figure numbers are the same as Figures 1 to 3, Figures 6 to 8, and Figures 12 to 16), an embodiment of the present application also provides a battery pack, including a battery module 200 and a battery case 100, wherein the battery module 200 is sealed and installed in the battery case 100, wherein the battery case 100 is the battery case 100 provided in an embodiment of the present application.

[0163] In one embodiment, after the battery module 200 is installed in the battery case 100, the lower end of the battery cell 211 of the battery module 200 is pressed against the tray 3 in the battery case 100, and the upper end of the battery cell 211 is spaced from the second sealing plate 5 to form a space for installing components such as a bus bar. The partition 2 is stuck in the middle of the length direction of the battery cell 211, that is, the middle of the battery cell 211 along the first direction, so that the length of the battery cell 211 in the first chamber 103 and the second chamber 104 is consistent, thereby ensuring uniform heat dissipation.

[0164] The present invention also provides a method for cooling a battery pack, comprising the following steps:

[0165] Step S100: providing cooling liquid so that the cooling liquid enters the second chamber 104 through the liquid inlet 101 of the battery case 100 and immerses the portion of the battery cell 211 located in the second chamber 104 along a second direction from an end of the second chamber 104 where the liquid inlet area 3011 is provided toward an end away from the liquid inlet area 3011;

[0166] In step S200, the coolant in the second chamber 104 enters the first chamber 103 through the reflux hole 2011 on the partition 2, and flows along the second direction from the end of the first chamber 103 where the reflux hole 2011 is provided toward the end where the liquid outlet area 2013 is located, submerging the portion of the battery cell 211 located in the first chamber 103;

[0167] In step S300 , the coolant is collected in the liquid outlet area 2013 and then discharged through the liquid outlet 102 .

[0168] In one embodiment, step S100 includes:

[0169] Step S110: Coolant enters the battery case 100 through the liquid inlet 101 and enters the second chamber 104 through the liquid inlet pipe 204;

[0170] Step S120: The coolant first contacts the diverter 304 to achieve diversion, and the coolant is evenly distributed to each third guide groove 3021 of the third guide assembly 302;

[0171] In step S130, the coolant in the third guide groove 3021 is transported to the guide gap 220 corresponding to the battery module 200 to perform heat exchange with the lower half of each battery cell 211 on one or both sides of the guide gap 220. The coolant is transported in the second direction from the end of the second chamber 104 where the liquid inlet area 3011 is provided toward the end away from the liquid inlet area 3011.

[0172] Step S200 includes:

[0173] S210, the coolant heat-exchanged from the guide gap 220 contacts the guide surface 3031 of the guide plate 303, and is guided to the reflux hole 2011 on the partition plate 2 through the guide surface 3031;

[0174] S220, the cooling liquid enters the first chamber 103 through the reflux hole 2011, and flows toward the side where the liquid outlet area 2013 is located along the guide surface 2051 of the blocking plate 205;

[0175] S230: The coolant flows through the second guide groove 2031 of the second guide assembly 203 into the corresponding guide gap 220, and performs heat exchange with the upper half of each battery cell 211 on one side or both sides of the guide gap 220;

[0176] S240 , the coolant in the guide gap 220 enters the first guide groove 2021 of the first guide component 202 , and all the first guide grooves 2021 collect the coolant to the liquid outlet area 2013 .

[0177] In addition, after the coolant is discharged into the battery case 100 , it can be cooled by an external refrigeration device. The cooled coolant is then recirculated to the liquid inlet 101 to cool the battery module 200 in the battery case 100 again.

[0178] The partitions 2 and trays 3 in the battery box 100 are not limited to being distributed vertically, but can also be distributed horizontally, that is, the first direction is the horizontal direction, and the second direction is not limited to being the length direction of the battery box 100, and the third direction is not limited to being the width direction of the battery box 100. The second direction can also be set to be the width direction of the battery box 100, and the third direction can be set to be the length direction of the battery box 100. When the first direction is the horizontal direction, the first chamber 103 and the second chamber 104 can be arranged left and right or right and left.

[0179] The flow direction of the coolant is shown in Figure 22 (in the direction of the arrow). After entering from the second chamber 104, it is immersed from bottom to top to cool the part of the battery cell 211 located in the second chamber 104. When the coolant reaches the top of the second chamber 104, it then enters the first chamber 103 through the reflux hole 2011, flows from the top to the bottom of the first chamber 103, and is immersed in the part of the battery cell 211 located in the first chamber 103 to cool it. Finally, it is discharged from the liquid outlet 102 below the first chamber 103 to the outside of the battery box 100.

[0180] Of course, the first direction is not limited to the horizontal direction, and can also form a certain angle with the horizontal direction. The specific cooling path of the coolant can refer to the previous example and will not be repeated here.

Claims

1. A separator, applied to a battery box, comprising: A first body, wherein a return hole and a plurality of mounting holes are formed through the first body along a first direction, wherein the mounting holes are configured to mount the battery cells of the battery module, wherein a liquid outlet area is formed on one side surface of the first body along the first direction, wherein the liquid outlet area is configured to be a liquid outlet connected to the battery box, wherein the liquid outlet area and the return hole are respectively adjacent to two ends of the first body along a second direction, wherein the mounting hole is located between the liquid outlet area and the return hole, and wherein the first direction and the second direction are configured to form an angle; A first flow guide component, wherein the first flow guide component and the liquid outlet area are located on the same side of the first body, the first flow guide component comprises a plurality of first flow guide grooves, the first ends of all the first flow guide grooves are connected to the liquid outlet area, the second ends of all the first flow guide grooves are connected to the area where the battery module is located, and the first flow guide component is configured to guide the coolant in the area where the battery module is located to the liquid outlet area.

2. The separator according to claim 1, wherein The battery module has multiple rows of battery cell groups arranged along a third direction, each row of the battery cell groups includes multiple battery cells arranged along the second direction, the third direction is set at an angle to the first direction and the second direction respectively, and a flow guide gap is formed between at least two adjacent rows of the battery cell groups, and the multiple first flow guide grooves correspond one-to-one to the multiple flow guide gaps.

3. The separator according to claim 2, wherein: Along the third direction, two side edges of the first body are spaced apart from the hole walls of the mounting hole respectively, so that the flow guide gap is formed on both sides of the battery module along the third direction.

4. The separator according to claim 2, wherein: The first guide assembly includes a plurality of first guide plates spaced apart from each other, a first guide groove is formed between two adjacent first guide plates, a first end of the first guide plate extends to the liquid outlet area, and a second end of the first guide plate extends to an area adjacent to the battery module.

5. The separator according to claim 4, wherein The width of the first end of the first guide plate is L1, the width of the second end of the first guide plate is L2, and L1 is smaller than L2; and / or, The end surface shape of the second end of the first guide plate matches the shape of the battery core; and / or, An end surface of the second end of the first guide plate is spaced apart from an outer side wall of the battery core.

6. The separator according to claim 1, wherein A collecting groove is provided on the first body and is located in the liquid outlet area, and all the first guide grooves are respectively connected to the collecting groove.

7. The separator according to claim 1, wherein The first flow guide assembly includes a plurality of first flow guide plates arranged at intervals, and the first flow guide groove is formed between two adjacent first flow guide plates; The two first guide plates located at the outermost sides of the first guide assembly along the third direction are first outer guide plates, the two first outer guide plates are connected at one end away from the battery cell, the first guide plates other than the two first outer guide plates are first inner guide plates, and the end of the first inner guide plate close to the first outer guide plate is spaced from the inner side wall of the first outer guide plate to form the liquid outlet area.

8. The separator according to any one of claims 1 to 7, wherein: An immersion hole is formed through the first body along the first direction, the immersion hole is located between adjacent mounting holes, and the immersion hole is formed corresponding to the gap between adjacent battery cells, and the size of the immersion hole is smaller than the size of the return hole.

9. The separator according to claim 8, wherein The sum of the areas of all the immersion holes on the first body is S1, the area of ​​the first body is S2, and the relationship ratio between S1 and S2 satisfies: 1:25000-3:50000; and / or, The area of ​​a single immersion hole is S3, the area of ​​a single reflow hole is S4, and the relationship ratio between S3 and S4 satisfies: 2:25-1:8; and / or, The sum of the areas of all the immersion holes on the first body is S1, the sum of the areas of all the reflow holes on the first body is S5, and the relationship ratio between S1 and S5 satisfies: 1:2-2:

3.

10. The separator according to claim 8, wherein The immersion hole is at least one of a semicircular hole, a circular hole, an elliptical hole, a square hole, a polygonal hole and a special-shaped hole; and / or, The reflux hole is at least one of a semicircular hole, a circular hole, an elliptical hole, a square hole, a polygonal hole and a special-shaped hole.

11. The separator according to any one of claims 1 to 7, wherein: A second flow guide component is disposed on the first body, the second flow guide component is adjacent to the return hole, the second flow guide component and the first flow guide component are located on the same side of the first body, the second flow guide component includes a plurality of second flow guide grooves, and all of the second flow guide grooves are respectively connected to the return hole and the area where the battery module is located.

12. The separator according to claim 11, wherein The battery module has multiple rows of battery cell groups arranged along a third direction, each row of the battery cell groups includes multiple battery cells arranged along the second direction, the third direction is set at an angle to the first direction and the second direction, respectively, and a flow guide gap is formed between at least two adjacent rows of the battery cell groups, and the multiple second flow guide grooves correspond one-to-one to the multiple flow guide gaps.

13. The separator according to claim 12, wherein The second guide assembly includes a plurality of second guide plates spaced apart from each other, a second guide groove is formed between two adjacent second guide plates, a first end of the second guide plate extends to a region adjacent to the battery cell, and at least one return hole is arranged between two adjacent second guide plates.

14. The separator according to claim 13, wherein The width of the second guide plate at the second end away from the liquid outlet area is L3, the width of the second guide plate at the first end adjacent to the liquid outlet area is L4, and L3 is smaller than L4; and / or, The end surface shape of the first end of the second guide plate matches the shape of the battery core; and / or, An end surface of the first end of the second guide plate is spaced apart from an outer side wall of the battery core.

15. The separator according to any one of claims 1 to 7, wherein: The first body is provided with a liquid inlet pipe, the liquid inlet pipe is fixed to the liquid outlet area, the liquid outlet area is provided with a through hole connected with the liquid inlet pipe, and the through hole runs through the first body.

16. The separator according to any one of claims 1 to 7, wherein: A plurality of the reflow holes are arranged on the first body at intervals along the third direction, or the reflow holes extend along the third direction; A blocking plate is also provided on the first body, and the blocking plate is located between the return hole and an end surface of the first body adjacent to the return hole along the second direction. The length of the blocking plate extends along the third direction, and the blocking plate protrudes from a side surface of the first body where the first flow guide component is provided.

17. The separator according to claim 16, wherein An inclined blocking plate guide surface is provided on one side of the blocking plate close to the return hole. The blocking plate guide surface extends from an end close to the first body to an end away from the first body in the first direction, and is inclined in the second direction toward a direction close to the first guide component.

18. The separator according to any one of claims 1 to 7, wherein: First groove groups are respectively arranged on both end surfaces of the first body along the third direction, and each group of the first groove groups includes a plurality of first grooves spaced apart along the second direction, and the first grooves are recessed toward the area between two adjacent mounting holes.

19. A tray, applied to a battery box, comprising: A second body, wherein a liquid inlet area is provided on the second body, the liquid inlet area is arranged to be connected to the liquid inlet of the battery box, and the liquid inlet area is arranged on one side surface of the second body along the first direction; a third flow guide component, the third flow guide component and the liquid inlet area are located on the same side of the second body, the third flow guide component comprises a plurality of third flow guide grooves, the first ends of all the third flow guide grooves are connected to the liquid inlet area, the second ends of all the third flow guide grooves are connected to the area where the battery module is located, and the third flow guide component is configured to disperse and guide the coolant in the liquid inlet area to the battery module; The guide plate and the third guide component are located on the same side of the second body along the first direction, and the guide plate and the third guide component are respectively adjacent to the two ends of the second body along the second direction, and a guide surface is provided on a side of the guide plate close to the third guide component.

20. The pallet according to claim 19, wherein: The flow guiding surface is a curved surface that is concave toward a side away from the third flow guiding component; or, The guide surface is an inclined surface, which extends from an end close to the second body to an end away from the second body in the first direction, and is inclined in the second direction toward a direction away from the third guide component.

21. The pallet of claim 19, wherein: The battery module has multiple rows of battery cell groups arranged along a third direction, each row of the battery cell groups includes multiple battery cells arranged along the second direction, the third direction is set at an angle to the first direction and the second direction respectively, and a flow guide gap is formed between at least two adjacent rows of the battery cell groups, and the multiple third flow guide grooves correspond one-to-one to the multiple flow guide gaps.

22. The pallet according to claim 21, wherein The third guide assembly includes a plurality of third guide plates arranged at intervals, and the third guide groove is formed between two adjacent third guide plates. The first end of the third guide plate extends to the liquid inlet area, and the second end of the third guide plate extends to an area adjacent to the battery module.

23. The pallet according to claim 22, wherein: The width of the first end of the third guide plate is L5, the width of the second end of the third guide plate is L6, and L5 is smaller than L6; and / or, The end surface shape of the second end of the third guide plate matches the shape of the battery core; and / or, An end surface of the second end of the third guide plate is spaced apart from an outer side wall of the battery core.

24. A pallet according to any one of claims 19 to 23, wherein: A flow divider is protruding from the second body and is located in the liquid inlet area.

25. The pallet of claim 24, wherein: The outer side wall of the diverter is at least partially an arc surface, and the cross-sectional dimension of one end of the diverter away from the second body in the first direction is smaller than the cross-sectional dimension of one end of the diverter connected to the second body in the first direction.

26. The pallet of claim 24, wherein: The third flow guide assembly includes a plurality of third flow guide plates arranged at intervals, wherein the third flow guide groove is formed between two adjacent third flow guide plates, wherein the first end of the third flow guide plate extends to the liquid inlet area, and the second end of the third flow guide plate extends to an area adjacent to the battery module; The two third guide plates located at the outermost sides are third outer guide plates, and the two third outer guide plates are connected at one end away from the battery core, and the third guide plates other than the two third outer guide plates are third inner guide plates, and the end of the third inner guide plate away from the battery core is spaced from the inner side wall of the third outer guide plate to form the liquid inlet area; The diverter member includes a diverter outer peripheral surface, a diverter bottom surface and a diverter top surface, the diverter top surface and the diverter bottom surface are arranged at intervals along the first direction, the diverter outer peripheral surface connects the diverter top surface and the diverter bottom surface, the diverter bottom surface is connected to the second body, the size of the diverter top surface is smaller than the size of the diverter bottom surface, the diverter outer peripheral surface includes a connecting surface and a diverter guide surface that are interconnected along the periphery of the diverter member, the connecting surface is connected to the inner side surface of the third outer guide plate, the diverter guide surface is a conical surface, and the diverter guide surface faces the third inner guide plate.

27. A pallet according to any one of claims 19 to 23, wherein: The second body is provided with a plurality of mounting grooves for clamping the battery cells in the battery module.

28. The pallet of claim 27, wherein: A first pressure relief hole is formed at the bottom of the installation groove, and the first pressure relief hole passes through the second body.

29. The pallet of claim 27, wherein: Second groove groups are respectively arranged on both end surfaces of the second body along the third direction, each of the second groove groups includes a plurality of second grooves spaced apart along the second direction, and the second grooves are recessed toward the area between two adjacent mounting grooves.

30. A pallet according to any one of claims 19 to 23, wherein: The second body has a circle of connecting protrusions protruding in an annular manner around it. The connecting protrusions and the third guide assembly are located on the same side of the second body. The connecting protrusions are recessed with a card slot configured to card-engage the box body of the battery box.

31. A battery box, comprising: A box body, wherein a liquid inlet and a liquid outlet are arranged at intervals on the box body, and a receiving cavity for receiving a battery module is arranged in the box body; A partition, wherein the partition is arranged in the accommodating cavity, the partition divides the accommodating cavity into a first chamber and a second chamber distributed along a first direction, the partition is provided with a plurality of mounting holes configured to mount the battery cells of the battery module, the two ends of the battery cells in the first direction respectively extend into the first chamber and the second chamber, the partition is provided with a reflux hole, the partition has a liquid outlet area connected to the liquid outlet, the liquid outlet area is located in the first chamber, the liquid outlet area and the reflux hole are respectively adjacent to the two ends of the partition along the second direction, the liquid outlet is connected to the liquid outlet area, the second chamber has a liquid inlet area, the liquid inlet area and the liquid outlet area are respectively adjacent to the same end of the box body along the second direction, the liquid inlet is connected to the liquid inlet area, wherein the first direction and the second direction are arranged at an angle.

32. The battery case according to claim 31, wherein: The separator is the separator according to any one of claims 1 to 18.

33. The battery case according to claim 32, wherein: The tray is the tray according to any one of claims 19 to 30, the tray is connected to the box body, the tray is separated from the partition, and the second chamber is formed between the tray and the partition.

34. The battery case according to claim 33, wherein: The tray is fixedly connected to the box body; or, The tray is provided with a slot, one end of the box body along the first direction is inserted into the slot, and sealant is provided in the slot. The sealant bonds the box body and the tray and seals the connection position between the box body and the tray.

35. The battery case according to claim 33, wherein: A pressure relief groove is recessed on a side of the tray away from the partition, a plurality of mounting grooves for clamping the battery cells are provided on the tray, a first pressure relief hole is provided at the bottom of the mounting groove, and the first pressure relief hole is connected to the pressure relief groove; A first sealing plate is connected to a side of the tray away from the partition plate, and the first sealing plate blocks the notch of the pressure relief groove.

36. The battery case according to claim 35, wherein: The box body is provided with a second pressure relief hole, and the second pressure relief hole communicates with the pressure relief groove and the outside of the box body.

37. The battery case according to claim 33, wherein: The projection of the reflow hole along the first direction at least partially overlaps with the drainage surface.

38. The battery case according to any one of claims 31 to 37, wherein: The height of the second chamber along the first direction is H1, the liquid level of the coolant in the accommodating cavity along the first direction is H2, the size of the battery cell along the first direction is H3, and the relationship ratio of H1, H2 and H3 satisfies: 2:5:5 or 1:4:

4.

39. The battery case according to any one of claims 31 to 37, wherein: The first direction is a vertical direction, and the first chamber is located above the second chamber.

40. The battery case according to any one of claims 31 to 37, wherein: The liquid inlet and the liquid outlet are located on the same side of the box body along the first direction and close to the first chamber, and the liquid inlet and the liquid outlet are respectively adjacent to one end where the liquid outlet area is located.

41. The battery case according to claim 40, wherein: The liquid inlet is connected to the second chamber via a liquid inlet pipe, and the liquid inlet pipe is at least partially disposed in the first chamber; The liquid inlet pipe passes through the partition and communicates with the second chamber; or, the liquid inlet pipe is connected to the partition, the partition is provided with a through hole communicated with the liquid inlet pipe, and the through hole passes through the partition.

42. The battery case according to any one of claims 31 to 37, wherein: An opening communicating with the accommodating cavity is provided at one end of the box body along the first direction, and a mounting portion is formed by extending the end of the box body toward the middle of the opening, and a second sealing plate is installed on the mounting portion to block the opening, and the liquid inlet and the liquid outlet are provided on the mounting portion and / or the second sealing plate.

43. The battery case according to any one of claims 31 to 37, wherein: The box body has a first side plate and a second side plate distributed along a third direction, and the inner side surfaces of the first side plate and the second side plate are respectively provided with a plurality of third grooves spaced along the second direction, the shape of the third grooves matches the shape of the outer side walls of the battery cells on the outer side of the battery module along the third direction, and the outer side walls of the battery cells are spaced from the groove walls of the third grooves, a convex structure is formed between two adjacent third grooves, the convex structure is inserted in the area between two adjacent battery cells along the second direction, and the convex structure is spaced from the outer side walls of the battery cells; The shape of the end surface of the partition along the third direction matches the shapes of the first side plate and the second side plate.

44. The battery case according to claim 43, wherein: The first side plate and the second side plate are corrugated plates respectively, and groove structures are formed on the outer sides of the first side plate and the second side plate corresponding to the protruding structures.

45. A battery pack, comprising a battery module and a battery case, wherein the battery module is sealed and installed in the battery case, and the battery case is the battery case as claimed in any one of claims 31 to 44.

46. ​​The battery pack according to claim 45, wherein: The battery module has multiple rows of battery cell groups arranged along the third direction, each row of the battery cell groups includes multiple battery cells arranged along the second direction, and two adjacent rows of the battery cell groups are staggered.

47. The battery pack according to claim 46, wherein: The battery cell is a cylindrical battery cell.

48. The battery pack according to claim 46, wherein: The partition of the battery box is located in the middle of the battery core along the first direction.

49. A method for cooling a battery pack, applied to the battery pack according to any one of claims 45 to 48, comprising: Providing a cooling liquid, so that the cooling liquid enters the second chamber from the liquid inlet of the battery box, and immerses the portion of the battery cell located in the second chamber along a second direction from an end of the second chamber where the liquid inlet area is provided toward an end away from the liquid inlet area; The coolant in the second chamber enters the first chamber through the reflux hole on the partition plate, and immerses the portion of the battery cell located in the first chamber along the second direction from the end of the first chamber where the reflux hole is provided toward the end where the liquid outlet area is located; The cooling liquid is collected in the liquid outlet area and discharged through the liquid outlet of the battery box.

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