Separator, battery case, and battery pack

Abstract

To provide a battery case that effectively improves a uniformity of a heat dissipation effect of each battery cell in a battery pack and prolongs the service life of the battery pack.SOLUTION: In a battery case 100, a return hole 2011 and a plurality of mounting holes 2012 through which a battery cell 211 of a battery module 200 are mounted are formed in a first main body so as to penetrate in a first direction. A liquid outlet region communicating with a liquid outlet port 102 of the battery case is formed in one of a side surface along the first direction, the liquid outlet region and the return hole are respectively close to both ends along a second direction of the first main body. The mounting hole is located between the liquid outlet region and the return hole, and the first direction and the second direction are provided at an angle. A first flow-conducting assembly and the liquid outlet region are located on the same side of the first main body, and the first flow-conducting assembly includes a plurality of first flow-conducting grooves 2021 whose a first end is in communication with the liquid outlet and whose a second end is in communication with the region where the battery module is located, so as to introduce a coolant in the region where the battery module is located into the liquid outlet region.SELECTED DRAWING: Figure 19

Description

[Technical Field]

[0001] The present application relates to the technical field of batteries, for example, to a separator, a battery case, and a battery pack including the battery case. [Background technology]

[0002] A battery pack typically includes a battery case and a battery module arranged within the battery case, with the battery module being formed by arranging several battery cells in a set pattern. Heat dissipation in a battery pack is extremely important, and the quality of heat dissipation directly affects the service life of the battery pack. Currently, battery packs employ a variety of heat dissipation methods, including air cooling, water cooling plates, and immersion in a coolant. The immersion method involves direct cooling of the coolant into the battery case, where it comes into contact with the battery cell housings for heat exchange. Currently, this type of heat dissipation method typically has an inlet port at one end of the battery case's length and an outlet port at the other end. The coolant is drawn into the inlet port, immerses the battery cells, then flows out the outlet port, is cooled outside the battery case, and is then transported back to the inlet port, circulating to cool the battery cells of the battery module.

[0003] In related technology, after the coolant enters the battery case, it is able to come into contact with more cooler coolant at positions close to the inlet, but it comes into contact with less cooler coolant at positions farther from the inlet, and ultimately cannot come into contact with cooler coolant at all. As a result, some battery cells in the battery case cannot be immersed in the cooler coolant, which makes it more likely that poor heat exchange effects will occur in these battery cells. Battery cells with poor heat exchange effects will deteriorate quickly over time and lose capacity, shortening the service life of the battery pack. Summary of the Invention [Problem to be solved by the invention]

[0004] The embodiments of the present application provide a separator that can increase the flow-directing effect of the coolant inside the battery case, improve the heat exchange effect of each battery cell, and extend the service life of the battery cells.

[0005] The embodiments of the present application provide a tray that distributes the coolant contained in the battery case so that each battery cell can be more uniformly immersed in the coolant at a low temperature, reduces the probability of the coolant returning to battery cells that have already undergone heat exchange, and extends the service life of the battery cells.

[0006] The embodiments of the present application provide a battery case with a simple structure, in which the heat exchange between the battery cells is uniform, and a battery pack with a long service life.

[0007] The embodiments of the present application provide a battery pack cooling method that can effectively improve the uniformity of the heat dissipation effect of each battery cell in the battery pack and extend the service life of the battery pack. [Means for solving the problem]

[0008] In a first aspect, an embodiment of the present application provides a separator for use in a battery case, the separator comprising a first body and a first flow guide assembly; the first body has a return hole and a plurality of mounting holes formed along a first direction and configured to mount battery cells of a battery module; a liquid outflow region formed on one of the side surfaces along the first direction and configured to communicate with a liquid outflow port of the battery case; the liquid outflow region and the return hole are respectively adjacent to both ends of the first body along a second direction; the mounting hole is located between the liquid outflow region and the return hole; and the first direction and the second direction form an angle; The first flow guide assembly and the outflow area are located on the same side of the first body, and the first flow guide assembly has a plurality of first flow guide grooves, all of whose first ends communicate with the outflow area and whose second ends communicate with the area where the battery modules are located, and is configured to introduce coolant in the area where the battery modules are located into the outflow area.

[0009] In a second aspect, an embodiment of the present application provides a tray adapted to a battery case, the tray comprising a second body, a third flow guide assembly, and a flow guide plate; the second body has a liquid inlet region that is configured to communicate with the liquid inlet port of the battery case and is provided on one of the side surfaces of the second body along the first direction; the third flow guide assembly and the liquid inlet area are located on the same side of the second body, the third flow guide assembly has a plurality of third flow guide grooves, all of which have first ends communicating with the liquid inlet area and second ends communicating with an area where the battery modules are located, and is configured to distribute the coolant in the liquid inlet area and guide it to the battery modules; The flow guide plate and the third flow guide assembly are located on the same side of the second body in the first direction, and are respectively adjacent to both ends of the second body in the second direction, with a flow guide surface provided on one side of the flow guide plate close to the third flow guide assembly.

[0010] In a third aspect, an embodiment of the present application provides a battery case including a case body and a separator; the case body is provided with a liquid inlet and a liquid outlet at an interval, and a housing chamber configured to house a battery module is provided within the case body; The separator is disposed within the storage chamber and divides the storage chamber into a first chamber and a second chamber distributed along a first direction. The separator has a plurality of mounting holes configured to allow battery cells of the battery module to be attached, and both ends of the battery cells extend into the first chamber and the second chamber, respectively. The separator has a return hole. The separator has a liquid outflow region communicating with the liquid outflow port. The liquid outflow region is located within the first chamber, and the liquid outflow region and the return hole are respectively close to both ends of the separator along the second direction. The liquid outflow port is connected to the liquid outflow region. The second chamber has a liquid inflow region, and the liquid inflow region and the liquid outflow region are respectively close to the same end of the case body along the second direction. The liquid inflow port is connected to the liquid inflow region, and the first direction and the second direction form an angle.

[0011] In a fourth aspect, an embodiment of the present application provides a battery pack including a battery module and a battery case, the battery module being hermetically mounted within the battery case, the battery case being the battery case described in the third aspect.

[0012] In a fifth aspect, an embodiment of the present application is applied to the battery pack according to the fourth aspect, providing a coolant, the coolant entering the second chamber through the liquid inlet of the battery case, and immersing the portion of the battery cell located in the second chamber along a second direction from one end of the second chamber where the liquid inlet area is provided toward one end farther from the liquid inlet area; the coolant in the second chamber enters the first chamber through the return hole in the separator, and flows in a second direction from the end of the first chamber where the return hole is provided toward the end where the liquid bleeding region is located, immersing the portion of the battery cell located in the first chamber; and a step of allowing the coolant to join the liquid outflow area and be discharged through a liquid outflow port of the battery case. [Effects of the Invention]

[0013] The beneficial effects of the present invention are as follows: By opening a return hole through the first body, the coolant on one side of the first body away from the outflow area can be drawn into the side of the first body where the outflow area is provided through the return hole; since the return hole and the outflow area are provided at both ends of the first body in the second direction, the coolant flows from the position of the return hole to successively immerse the battery cells protruding from the first body, exchange heat, then join the outflow area and can be discharged through the outflow port, thereby increasing the heat exchange effect of the battery cells; and since the first flow guide assembly is provided between the outflow area and the battery module, all the coolant that has completed heat exchange with the battery cells can join the outflow area as quickly as possible, accelerating the discharge of high-temperature coolant after heat exchange and improving the cooling effect.

[0014] The beneficial effects of the present invention are as follows: The tray is provided with a liquid inlet area configured to receive the coolant from the liquid inlet port of the battery case, and a third flow guide assembly that distributes the coolant in the liquid inlet area before directing it to the battery modules, allowing the battery modules to be more uniformly immersed in the coolant and dissipate heat through heat exchange, improving the heat dissipation effect of the battery modules; and the provision of a flow guide plate that can guide the coolant after heat exchange with the battery modules to other areas for heat exchange or to the outside of the battery case ensures that heat exchange in other areas can be carried out smoothly and reduces the probability that the coolant will return to battery modules that have already exchanged heat.

[0015] The beneficial effects of the present invention are as follows: A separator is provided to divide the storage chamber within the case body into independent first and second chambers. After the battery cells are attached to the separator, the two chambers are sealed relative to one another. The coolant first enters the inlet region of the second chamber through the inlet port and then flows in a second direction, from the end closest to the inlet region toward the end furthest from the inlet region, successively immersing the portions of the battery cells located in the second chamber, thereby exchanging heat with the battery cells and dissipating heat. The coolant then enters the first chamber through the return holes in the separator and successively immerses the portions of the battery cells located in the first chamber from the return hole side toward the outlet region, thereby exchanging heat with the remaining portions of the battery cells. After heat exchange, the coolant merges with the outlet region and is discharged through the outlet port. During this process, the coolant gradually exchanges heat with the battery cells of the battery module. The special infiltration path of the coolant increases the probability of contact with each battery cell, improving the uniformity and effectiveness of heat exchange among all battery cells and extending the service life of the battery cells. [Brief explanation of the drawings]

[0016] [Figure 1] FIG. 2 is a front view of a separator according to an embodiment of the present invention. [Figure 2] FIG. 2 is a perspective schematic view of a separator according to an embodiment of the present invention at one viewing angle. [Figure 3] FIG. 2 is a perspective schematic view of a separator according to an embodiment of the present invention at another viewing angle. [Figure 4] FIG. 2 is an enlarged schematic view of a portion A in FIG. [Figure 5] FIG. 2 is an enlarged schematic view of a portion B in FIG. [Figure 6] FIG. 2 is a front view of a tray according to an embodiment of the present invention. [Figure 7] FIG. 2 is a perspective view of one viewing angle of a tray according to an embodiment of the present application. [Figure 8] FIG. 10 is a perspective view of the tray of the embodiment of the present application from another viewing angle. [Figure 9] FIG. 7 is an enlarged schematic view of a portion C in FIG. 6. [Figure 10]1 is a perspective view of an embodiment of the present invention in which the tray and the case body are of an integral structure, taken from one viewing angle; FIG. [Figure 11] FIG. 10 is a perspective view of another embodiment of the present invention in which the tray and the case body are integrally formed, viewed from one viewing angle. [Figure 12] FIG. 2 is a top view of a battery case according to an embodiment of the present invention. [Figure 13] FIG. 2 is a perspective view of one viewing angle of a battery case according to an embodiment of the present application. [Figure 14] FIG. 10 is a perspective view of the battery case of the embodiment of the present application from another viewing angle. [Figure 15] FIG. 2 is a top view of the battery case of the embodiment of the present application (the second closing plate is not shown). [Figure 16] FIG. 2 is a perspective view of a battery case according to an embodiment of the present invention (a second closing plate is not shown). [Figure 17] FIG. 2 is a top view of the battery pack according to the embodiment of the present application (the second closing plate is not shown). [Figure 18] 1 is a perspective view of a battery pack according to an embodiment of the present application (a second closing plate is not shown). [Figure 19] FIG. 2 is an exploded view of the battery pack according to the embodiment of the present application. [Figure 20] FIG. 2 is a perspective view of one viewing angle of the case body of the embodiment of the present application. [Figure 21] FIG. 10 is a perspective view of the case body of the embodiment of the present application from another viewing angle. [Figure 22] 1 is a cross-sectional view of a battery pack according to an embodiment of the present invention (the arrow direction indicates the flow direction of a coolant). [Figure 23] FIG. 2 is a partial cross-sectional view of a separator according to an embodiment of the present invention. [Figure 24] FIG. 2 is a cross-sectional schematic diagram of a flow diverter according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0017] As shown in Figures 1 to 3 (see Figures 15 to 17, Figure 19 and Figure 22), an embodiment of the present application provides a separator 2 applied to a battery case 100 of a battery pack, and in this embodiment, the first direction is the vertical direction (the height direction of the battery case 100, i.e., the height direction of the separator 2), the second direction is the length direction of the battery case 100, i.e., the length direction of the separator 2, and the third direction is the width direction of the battery case 100, i.e., the width direction of the separator 2.

[0018] In this embodiment, the separator 2 includes a first body 201 and a first flow guide assembly 202, in which the first body 201 is provided with a return hole 2011 and a plurality of mounting holes 2012 configured to mount the battery cells 211 of the battery module 200 in the battery case 100, and the return hole 2011 is formed in the first direction and penetrates the first body 201. The return hole 2011 is formed on the upper surface of the first body 201 in the first direction, and the liquid outflow area 2013 is formed to communicate with the liquid outflow port 102 of the battery case 100. The liquid outflow area 2013 and the return hole 2011 are formed in .... The mounting holes 2012 are located near both ends of the first body 201 in the second direction, i.e., at both ends of the separator 2 in the longitudinal direction, the mounting holes 2012 are located between the outflow area 2013 and the return hole 2011, the first flow-conducting assembly 202 and the outflow area 2013 are both located on the upper surface of the first body 201, the first flow-conducting assembly 202 has a plurality of first flow-conducting grooves 2021, one end of each of the first flow-conducting grooves 2021 is connected to the outflow area 2013 and the other end is connected to the area where the battery module 200 is located, and the first flow-conducting assembly 202 is configured to introduce the coolant in the area where the battery module 200 is located into the outflow area 2013.

[0019] In the separator 2 of this embodiment, the return hole 2011 is opened through the first body 201, so that the cooling liquid on one side of the first body 201 that is away from the outflow region 2013 (i.e., the lower side of the separator 2) can be drawn by the return hole 2011 to the side of the first body 201 where the outflow region 2013 is provided (i.e., the upper side of the separator 2). In addition, since the return hole 2011 and the outflow region 2013 are respectively close to both ends of the first body 201 in the second direction, the cooling liquid can flow to the position where the return hole 2011 is located. The battery cells 211 protruding from the first body 201 are successively immersed in the liquid, and after heat exchange, the liquid joins the liquid outflow area 2013 and can be discharged from the liquid outflow port 102, thereby increasing the heat exchange effect of the battery cells 211. Furthermore, since the first flow guide assembly 202 is provided between the liquid outflow area 2013 and the battery module 200, all the coolant that has completed heat exchange in the battery cells 211 can join the liquid outflow area 2013 as quickly as possible, accelerating the discharge of high-temperature coolant after heat exchange and improving the cooling effect.

[0020] In one embodiment, the battery module 200 has multiple rows of battery cell groups 210 arranged along the third direction, each row of the battery cell groups 210 having multiple battery cells 211 arranged along the second direction, the third direction being arranged at an angle with both the first direction and the second direction, and current guide gaps 220 being formed between at least two adjacent rows of the battery cell groups 210, with multiple first current guide grooves 2021 and multiple current guide gaps 220 in one-to-one correspondence. By arranging the flow guide gaps 220 between the battery cell groups 210 in a one-to-one correspondence with the first flow guide grooves 2021, after the coolant is drawn in through the return holes 2011, it passes through the multiple flow guide gaps 220 and branches, increasing the opportunity for the coolant to come into contact with the coolant in each battery cell 211 in each row of battery cell groups 210. Furthermore, after the first flow guide grooves 2021 and the flow guide gaps 220 are connected to each other, most of the coolant after exchanging heat with the two adjacent rows of battery cell groups 210 flows through the first flow guide grooves 2021 to join the liquid outflow area 2013 and is then discharged as quickly as possible to the outside of the battery case 100 through the liquid outflow openings 102. This reduces the chance of the coolant after exchanging heat with the two adjacent rows of battery cell groups 210 returning or mixing with the battery cell groups 210 in other rows, and further prevents the occurrence of situations where the heat exchange efficiency of a battery cell 211 is low.

[0021] In one embodiment, both end surfaces of the first body 201 are spaced apart from the wall of the mounting hole 2012 along the third direction, thereby forming a current guide gap 220 on both sides of the battery module 200 along the third direction. In one embodiment, the mounting holes 2012 are spaced apart from both end surfaces of the first body 201 in the third direction, so that the battery cells 211 can form a gap between them and the end surfaces of the first body 201 (i.e., the separator 2) after being mounted. After the separator 2 is mounted in the battery case 100, a gap can be formed between the battery cells 211 and the inner wall of the battery case 100. This gap also serves as a flow guide gap 220 through which the coolant passes. A first flow guide groove 2021 is also provided corresponding to the flow guide gap 220 at this position. This ensures that the battery cells 211 on both sides of the battery module 200 in the third direction can also come into contact with the coolant at a lower temperature, and ensures uniform heat exchange for the battery cells 211 at this position.

[0022] 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 two adjacent first flow guide plates 2022, and one end of each first flow guide plate 2022 extending to the liquid outflow region 2013 and the other end extending to a region adjacent to the battery module 200. The outwardly protruding first flow guide plate 2022 reduces the overall thickness of the first body 201, reducing the overall space occupied by the separator 2 in the battery case 100, improving the energy density of the entire battery pack, and reducing the area of ​​the battery cells 211 blocked by the first body 201, allowing more of the battery cells 211 to be immersed in the coolant and dissipate heat.

[0023] In one embodiment, the first flow guide plate 2022 and the first body 201 are integrally injection molded from plastic. The integral injection molding method reduces the difficulty of attaching and manufacturing the first flow guide plate 2022, reduces the number of parts, and reduces costs. Of course, the first flow guide plate 2022 may be manufactured separately and then fixed to the first body 201 by adhesive bonding, welding, screw connection, fastening, etc.

[0024] In another embodiment, instead of providing a separate first flow guide plate 2022, the thickness of the first body 201 may be increased and grooves may be formed in the first body 201 to form the first flow guide grooves 2021.

[0025] 4 (see FIGS. 1 to 3, 15 to 17, 19, and 22), the first flow guide plate 2022 has a width L1 at one end adjacent to the outflow region 2013 and a width L2 at one end adjacent to the battery cell 211, where L1 is smaller than L2. By widening the width of the portion of the first flow guide plate 2022 adjacent to the battery cell 211, it is possible to minimize the intrusion of the coolant in the flow guide gap 220 into other regions. On the other hand, the narrow width of the end of the first flow guide plate 2022 adjacent to the outflow region 2013 is intended to create a converging effect. Since the size of the outflow region 2013 is generally designed to be smaller than the width of the battery module 200 (i.e., the size of the battery module 200 in the third direction), it is necessary to narrow the first flow guide assembly 202.

[0026] The shape of the end face of the first flow guide plate 2022 at one end closest to the battery cell 211 matches the outer shape of the battery cell 211. This design allows the first flow guide plate 2022 to better fit the shape of the battery cell 211, creating a better flow guide effect and allowing the coolant in the flow guide gap 220 to enter the first flow guide groove 2021 with less resistance.

[0027] In this embodiment, the battery cells 211 are cylindrical battery cells, and the end face of the first flow guide plate 2022 closest to the battery cells 211 is an arcuate surface. Of course, the shape of the battery cells 211 is not limited to cylindrical, and they may be rectangular, polygonal, or irregularly shaped. In this case, the shape of the end face of the first flow guide plate 2022 closest to the battery cells 211 can be adjusted according to the outer shape of the battery cells 211.

[0028] Furthermore, there is a gap between the end face of the first flow guide plate 2022 closest to the battery cell 211 and the outer wall of the battery cell 211. This design prevents the first flow guide plate 2022 from directly contacting the outer wall of the battery cell 211, allowing as much of the battery cell 211 as possible to come into contact with the coolant and exchange heat, and also prevents the first flow guide plate 2022 from blocking the battery cell 211.

[0029] 23 (see FIGS. 1 to 22), a confluence groove 2018 is recessed in the first body 201 at the liquid outflow region 2013, and all of the first guide grooves 2021 communicate with the confluence groove 2018. The recessed confluence groove 2018 improves the confluence effect, speeding up the confluence of the coolant in the first guide groove 2021 into the confluence groove 2018, and reducing the probability of the coolant in the first guide groove 2021 flowing back into the guide gap 220 of the battery module 200.

[0030] In this embodiment, the confluence groove 2018 is an arc-shaped groove, which reduces the resistance when the coolant flows into the confluence groove 2018, speeds up the confluence of the coolant into the confluence groove 2018, and allows the coolant to be transported to the outside of the battery case 100 through the outlet 102 as quickly as possible.

[0031] In one embodiment, the two first flow guide plates 2022 located outermost in the first flow guide assembly 202 in the third direction are first outer flow guide plates 20221, and the ends of the two first outer flow guide plates 20221 far from the battery cells 211 are connected, and the remaining first flow guide plates 2022 are first inner flow guide plates 20222, and an end of the first inner flow guide plate 20222 close to the first outer flow guide plate 20221 is spaced apart from the inner wall of the first outer flow guide plate 20221 to form an outflow region 2013. The outflow region 2013 is provided within the first flow guide assembly 202, and the two first outer flow guide plates 20221 are used to block the outflow region 2013, thereby effectively preventing the coolant introduced through the first flow guide grooves 2021 from leaking out of the outflow region 2013.

[0032] Of course, the two first outer flow guide plates 20221 may not be connected, but may be extended, and after the separator 2 is attached to the case body 1 of the battery case 100, one end of the first outer flow guide plate 20221 farther from the battery cell 211 may be tightly abutted against the inner wall of the case body 1, which can also achieve the same effect.

[0033] In one embodiment, the first body 201 has a dip hole 2015 extending through it in the first direction, the dip hole 2015 being located between adjacent mounting holes 2012 and corresponding to the gap between adjacent battery cells 211, and the size of the dip hole 2015 being smaller than the size of the return hole 2011. By providing the soaking holes 2015, before the coolant reaches the return holes 2011, some coolant at a lower temperature is allowed to seep in from the lower region of the first body 201, and heat is exchanged with and dissipated from the battery cells 211 in the upper region of the first body 201, thereby improving the cooling effect. The coolant drawn in from the return holes 2011 enters the flow guide gaps 220 of the battery module 200 located above the first body 201, and mixes with the part of the coolant that has passed through the soaking holes 2015, and heat is exchanged with and dissipated from the battery cells 211, thereby making the temperature of the coolant in the upper region of the first body 201 higher than the temperature of the coolant in the lower region. The soaking holes 2015 have the effect of replenishing coolant at a low temperature, so that the temperature of the coolant in the upper region of the first body 201 is increased and the heat dissipation effects of the upper and lower parts of the battery cell 211 can be matched. By mixing this with the coolant drawn in through the return holes 2011, the temperature of the coolant in the upper region of the first body 201 is reduced. By setting the size of the soaking holes 2015 smaller than the size of the return holes 2011, the amount of coolant passing through the soaking holes 2015 can be reduced, avoiding affecting the amount of coolant in the return holes 2011, and allowing the battery cells 211 close to the return holes 2011 to maintain normal heat exchange and heat dissipation effects.

[0034] In this embodiment, the sum of the areas of all the submerged holes 2015 in the first body 201 is S1, the area of ​​the first body 201 is S2, and the relationship ratio between S1 and S2 can satisfy 1:25000 to 3:50000, for example, the relationship ratio between S1 and S2 can be 1:25000, 1:20000, 3:50000, etc. When the sum S1 of the areas of the submerged holes 2015 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 in the return hole 2011 can be avoided.

[0035] The area of ​​the single submerged hole 2015 is S3, and the area of ​​the single return hole 2011 is S4. The ratio between S3 and S4 can be 2:25 to 1:8, for example, the ratio between S3 and S4 can be 2:25, 2:23, 2:20, 2:18, 2:17, or 1:8. The area of ​​the single submerged hole 2015 should be much smaller than the area of ​​the single return hole 2011, which is beneficial for most of the coolant to flow to the upper region of the first body 201 through the return hole 2011, and for pushing the coolant to flow to the outflow region 2013, thereby reducing turbulence.

[0036] The sum of the areas of all the submerged holes 2015 in the first body 201 is S1, and the sum of the areas of all the reflux holes 2011 in the first body 201 is S5, and the relationship ratio between S1 and S5 can satisfy 1:2 to 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, etc.; The soaking holes 2015 are configured to allow the coolant to penetrate and exchange heat with the battery cells 211, thereby improving the cooling uniformity of the entire battery cells 211 and reducing the temperature difference. In addition, the total area of ​​the soaking holes 2015 must be smaller than the total area of ​​the return holes 2011, which is advantageous for the coolant to return to the upper region of the first body 201 through the return holes 2011 and push the coolant to flow to the outflow region 2013, thereby reducing turbulence.

[0037] In this embodiment, the immersion hole 2015 is a circular hole. In other embodiments, the immersion hole 2015 may be at least one of a semicircular hole, an elliptical hole, a square hole, a polygonal hole, and an irregular-shaped hole. For example, the first body 201 has both a circular immersion hole 2015 and a semicircular immersion hole 2015.

[0038] 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 where the battery cell 211 is located, and the flat hole wall 20112 faces.

[0039] In one embodiment, the first body 201 is provided with a plurality of return holes 2011 spaced apart along the third direction, and the number and positions of the return holes 2011 correspond to the number of the flow guiding gaps 220 of the battery module 200, i.e., one flow guiding gap 220 corresponds to one return hole 2011. With this design, when the return holes 2011 draw the coolant below the first body 201 to above the first body 201, they can be diverted as evenly as possible into the corresponding flow guiding gaps 220, thereby improving the heat exchange and heat dissipation effect of the coolant with each battery cell 211.

[0040] The first body 201 is further provided with a blocking plate 205 positioned between the return hole 2011 and one end face of the first body 201 that is close to the return hole 2011 along the second direction, the length of the blocking plate 205 extending along the third direction, and the blocking plate 205 protrudes from one side of the first body 201 on which the first flow guide assembly 202 is provided (i.e., the blocking plate 205 protrudes from the upper side of the first body 201). The return hole 2011 is still a certain distance from the end of the first body 201, and after the separator 2 is attached to the case body 1, there is still a space between the return hole 2011 and the case body 1. Without the closing plate 205, when the coolant enters the upper part of the first body 201 through the return hole 2011, some of the coolant would likely accumulate in this space, preventing it from smoothly entering the flow guiding gaps 220 of the battery module 200 for heat exchange. Therefore, by providing the closing plate 205, the coolant can be effectively prevented from accumulating in the space between the hole wall of the return hole 2011 and the case body 1, and all of the coolant that enters the upper part of the first body 201 through the return hole 2011 from below can enter the flow guiding gaps 220 of the battery module 200 for heat exchange. In one embodiment, both ends of the closing plate 205 in the third direction are in close contact with the two inner walls of the case body 1 in the third direction, respectively. This design is intended to reduce the occurrence of stagnation of the coolant due to the coolant entering the regions at both ends of the closing plate 205 in the third direction.

[0041] In one embodiment, a sloping blocking plate flow guide surface 2051 is provided on one side of the blocking plate 205 near the return hole 2011, and the blocking plate flow guide surface 2051 extends from one end near the first body 201 to one end far from the first body 201, and is inclined toward the side where the first flow guide assembly 202 is located (i.e., a sloping blocking plate flow guide surface 2051 is provided on one side of the blocking plate 205 near the return hole 2011, and the blocking plate flow guide surface 2051 extends in a first direction from one end near the first body 201 to one end far from the first body 201, and is inclined in a second direction toward the direction near the first flow guide assembly 202). The inclined closing plate flow directing surface 2051 can guide the coolant drawn out from the return holes 2011 toward the side where the first flow directing assembly 202 and battery module 200 are located, accelerating the coolant's entry into the flow directing gap 220. In one embodiment, one side of the closing plate flow directing surface 2051 close to the first body 201 is flush with the flat hole wall 20112 of the return holes 2011. This design ensures that all the coolant drawn out from the return holes 2011 can be guided by the closing plate flow directing surface 2051, and reduces the resistance the coolant experiences from the closing plate 205, resulting in a faster flow of the coolant.

[0042] Of course, the return hole 2011 is not limited to a semicircular hole, but may be at least one of a circular hole, an elliptical hole, a rectangular hole, a polygonal hole, and an irregular-shaped hole, and for example, the first body 201 is provided with both a semicircular return hole 2011 and a circular return hole 2011. In addition, the number of return holes 2011 is not limited to a plurality, and only one return hole 2011 may be provided, and when only one return hole 2011 is provided, the length of the return hole 2011 may extend along the third direction so that the return hole 2011 can transport the coolant to all of the flow guiding gaps 220.

[0043] The closing plate 205 and the first body 201 are manufactured and molded separately, and the lower surface of the closing plate 205 is in close contact with the upper surface of the first body 201. A gasket may be provided between the closing plate 205 and the first body 201 to prevent coolant from entering the position where the closing plate 205 is in contact with the first body 201. In another embodiment, the closing plate 205 and the first body 201 may be integrally injection molded, which reduces the manufacturing difficulty.

[0044] Furthermore, the inside of the closing plate 205 may be hollow, and the hollow structure reduces the weight of the closing plate 205, and further reduces the weight of the separator 2 as a whole.

[0045] In one embodiment, the first body 201 is provided with a second flow guide assembly 203 adjacent to the return hole 2011, and the second flow guide assembly 203 and the first flow guide assembly 202 are located on the same side of the first body 201, i.e., the second flow guide assembly 203 is also located on the upper side of the first body 201, and the second flow guide assembly 203 has a plurality of second flow guide grooves 2031, and all of the second flow guide grooves 2031 respectively connect the return hole 2011 to the area where the battery module 200 is located. By providing the second guide assembly 203, which can guide the coolant drawn out from the return hole 2011 in a direction as far as possible, the coolant from the return hole 2011 can be guided to the battery module 200 as much as possible, allowing the battery module 200 to dissipate heat. Furthermore, the provision of multiple second guide grooves 2031 also serves to distribute the coolant, ensuring that the battery cells 211 at each position in the battery module 200 can dissipate heat as evenly as possible.

[0046] In this embodiment, there is a one-to-one correspondence between the plurality of second flow guide grooves 2031 and the plurality of flow guide gaps 220. By arranging the second flow guide grooves 2031 and the flow guide gaps 220 in a corresponding position and number, the coolant drawn in from the return hole 2011 can sequentially pass through the second flow guide grooves 2031, the flow guide gaps 220, and the first flow guide grooves 2021 to join the outflow area 2013, thereby minimizing the mixing of the coolant in the second flow guide assembly 203 and preventing localized low heat exchange efficiency in the battery cells 211.

[0047] In one embodiment, each second flow guide groove 2031 communicates with a return hole 2011. This design is intended to achieve uniform flow distribution, ensure balance in the flow rate and temperature of the coolant in each flow guide gap 220, and ensure uniform heat dissipation from the battery cells 211 in each row of battery cell groups 210. Of course, each second flow guide groove 2031 is not limited to communicating with only one return hole 2011, and each second flow guide groove 2031 may communicate with two or more return holes 2011. All the second guide grooves 2031 may be connected to the same number of return holes 2011, or may correspond to different numbers of return holes 2011. If the heat generation amount of the central battery cell 211 along the third direction of the battery module 200 is higher than that of the battery cells 211 on either side, the number of return holes 2011 corresponding to the central battery cell 211 can be increased, and the second guide grooves 2031 at this position can be connected to more return holes 2011, thereby increasing the flow rate of the coolant at this position.

[0048] In this embodiment, the second flow guide assembly 203 includes a plurality of spaced-apart second flow guide plates 2032, with a second flow guide groove 2031 formed between each pair of adjacent second flow guide plates 2032, and one end of the second flow guide plate 2032 extending to an area adjacent to the battery cell 211. The outwardly protruding second flow guide plate 2032 reduces the overall thickness of the first body 201, reducing the overall space occupied by the separator 2 in the battery case 100, improving the energy density of the entire battery pack, and reducing the area of ​​the battery cell 211 blocked by the first body 201, allowing more of the battery cell 211 to be immersed in the coolant for heat dissipation.

[0049] In one embodiment, the second flow guide plate 2032 and the first body 201 are integrally injection molded from plastic. The integral injection molding method reduces the difficulty of attaching and manufacturing the second flow guide plate 2032, reduces the number of parts, and lowers costs. Of course, the second flow guide plate 2032 can also be manufactured separately and then fixed to the first body 201 by adhesive bonding, welding, screw connection, fastening, etc.

[0050] In another embodiment, instead of providing a separate second flow guide plate 2032, the thickness of the first body 201 may be increased and grooves may be formed in the first body 201 to form the second flow guide grooves 2031.

[0051] 5 (see also FIGS. 1 to 3, 15 to 17, 19, and 22), the second flow guide plate 2032 has a width L3 at one end remote from the liquid outflow region 2013 and a width L4 at one end close to the liquid outflow region 2013, where L3 is smaller than L4. By widening the width of the portion of the second flow guide plate 2032 close to the battery cell 211, it is possible to minimize the amount of coolant in the flow guide gap 220 entering other regions. On the other hand, the width of the end remote from the liquid outflow region 2013 of the second flow guide plate 2032 is narrowed to avoid the opening position of the return hole 2011 and to avoid blocking the return hole 2011.

[0052] The shape of one end face of the second flow guide plate 2032 adjacent to the outflow area 2013 matches the outer shape of the battery cell 211. This design allows the second flow guide plate 2032 to better fit the shape of the battery cell 211, creating a better flow guide effect and allowing the coolant in the second flow guide groove 2031 to enter the flow guide gap 220 with less resistance.

[0053] In this embodiment, the end face of the second flow guide plate 2032 closest to the battery cell 211 is an arcuate surface. Of course, if the battery cell 211 has a different shape, the shape of the end face of the second flow guide plate 2032 closest to the battery cell 211 can be adjusted according to the outer shape of the battery cell 211.

[0054] In addition, there is a gap between the end face of the second flow guide plate 2032 at one end closest to the battery cell 211 and the outer wall of the battery cell 211. This design prevents the second flow guide plate 2032 from directly contacting the outer wall of the battery cell 211, allowing as much of the battery cell 211 as possible to come into contact with the coolant and exchange heat, and also prevents the second flow guide plate 2032 from blocking the battery cell 211.

[0055] In one embodiment, the first body 201 is provided with a liquid inlet pipe 204 fixed to the liquid outflow region 2013, and the liquid outflow region 2013 is provided with a via hole 2017 communicating with the liquid inlet pipe 204, the via hole 2017 penetrating the first body 201. The provision of the liquid inlet pipe 204 facilitates drawing the liquid from the liquid inlet port 101 into the lower region of the first body 201 and prevents the coolant from the liquid inlet port 101 and the liquid outflow region 2013 from mixing. After the separator 2 is attached to the case body 1, the coolant is first drawn into the lower region of the separator 2 to exchange heat and dissipate heat, and then the coolant passes through the return hole 2011 and enters the upper region of the separator 2, where it then immerses the battery cells 211 from a position closer to the return hole 2011 toward a position closer to the liquid outflow region 2013 to exchange heat and dissipate heat.

[0056] Of course, the liquid inlet pipe 204 is not limited to being fixed to the liquid outlet region 2013, but may directly pass through the via hole 2017 and then have a portion thereof enter the lower region of the first main body 201. Without providing the liquid inlet pipe 204, the liquid inlet port 101 may be provided directly in the lower region of the first main body 201, that is, the liquid inlet port 101 may be directly connected to the lower region of the first main body 201.

[0057] The first body 201, first flow guide plate 2022, second flow guide plate 2032, and liquid inlet pipe 204 are integrally injection molded from plastic. The integral injection molding method has low manufacturing costs, a small number of parts, and is easy to install. Each component of the first body 201, such as the first flow guide plate 2022, second flow guide plate 2032, and liquid inlet pipe 204, may be manufactured separately and then fixed to the first body 201 by welding, adhesive bonding, screw connection, or fastening.

[0058] In one embodiment, a first groove group is provided on both end surfaces of the first body 201 in the third direction, and each first groove group includes a plurality of first grooves 2016 spaced apart in the second direction, and 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 in the third direction. This is because the widths of the current guide gaps 220 between adjacent battery cell groups 210 are the same when the battery cells 211 are the same size. However, if the first grooves 2016 are not provided in the current guide gaps 220 located on both sides of the battery module 200 in the third direction, current guide gaps 220 with different widths will be formed, resulting in a mismatch between the temperature-reducing effects of the battery cells 211 on both sides of the battery module 200 and the middle battery cell 211. In one embodiment, the first grooves 2016 are arc-shaped grooves, and two adjacent first grooves 2016 are connected by an arc-shaped first protrusion 2014, so that the end surface of the first body 201 along the third direction forms a wavy surface.

[0059] 12 to 16 (some reference numerals are used from FIGS. 1 to 3 and 17 to 22), an embodiment of the present application further provides a battery case 100, which includes a case main body 1 having a storage chamber therein, and a separator 2 according to an embodiment of the present application, which is provided within the case main body 1 and divides the storage chamber into a first chamber 103 and a second chamber 104 that are independent of each other above and below, and a first flow guide assembly 202, a second flow guide assembly 203, and a closing plate 205 of the separator 2 are all located within the first chamber 103, and the liquid inlet 101 communicates with the second chamber 104, and the battery cell 211 is fixed within a mounting hole 2012 of the first main body 201, and one end of the battery cell 211 is connected to a first The coolant flows from one end of the second chamber 104, where the first flow guide assembly 202 is located, close to the separator 2, to the other end where the return hole 2011 is located, immersing the battery cells 211 and dissipating heat therefrom, before entering the first chamber 103 through the return hole 2011. The guide action of the blocking plate flow guide surface 2051 of the blocking plate 205 causes the coolant to flow into the second flow guide grooves 2031 of each second flow guide assembly 203, before passing through the flow guide gaps 220 and the first flow guide grooves 2021 of the battery modules 200 before joining the outflow area 2013 and finally being discharged through the outflow port 102.

[0060] In this battery case 100, a first chamber 103 and a second chamber 104 are formed independently by the partition of the separator 2, and the first current guide assembly 202, the second current guide assembly 203, the blocking plate 205, and the return hole 2011 in the separator 2 work together to effectively exchange heat with and dissipate heat from the battery cells 211, thereby preventing phenomena such as deterioration over time caused by uneven heat dissipation in local battery cells 211 and extending the service life of the entire battery module 200.

[0061] In addition, when the battery cell 211 is mounted in the mounting hole 2012, it is fixed and sealed by the sealant, which prevents the battery cell 211 from shifting position in the separator 2, and further prevents the coolant in the upper region of the separator 2 (i.e., the coolant in the first chamber 103) from passing through the gap between the battery cell 211 and the wall of the mounting hole 2012 and entering the lower region of the separator 2 (i.e., the second chamber 104), effectively preventing the coolant from mixing.

[0062] In other embodiments, the first direction is not limited to being the vertical direction, but may be the horizontal direction, i.e., when the battery case 100 is placed vertically, the first direction is the horizontal direction, and further, the second direction is not limited to being the length direction of the battery case 100, and the third direction is not limited to being the width direction of the battery case 100, but may be the width direction of the battery case 100, and the third direction is the length direction of the battery case 100, and the specific direction limitations will not be repeated.

[0063] 17 to 22, an embodiment of the present application further provides a battery pack including a battery case 100 having a storage chamber therein, and a battery module 200 provided in the storage chamber. The specific structure of the battery case 100 will not be described repeatedly.

[0064] As shown in Figures 6 to 8 (see Figures 15 to 17, 19 and 22), an embodiment of the present application provides a tray 3 that is applied to a battery case 100, and in this embodiment, the first direction is the vertical direction, the second direction is the length direction of the battery case 100, i.e., the length direction of the tray 3, and the third direction is the width direction of the battery case 100, i.e., the width direction of the tray 3.

[0065] In this embodiment, the tray 3 includes a second body 301, a third flow guide assembly 302, and a flow guide plate 303. The second body 301 includes a liquid inlet area 3011, which is configured to communicate with the liquid inlet port 101 of the battery case 100 and is provided on the upper surface of the second body 301 along the first direction. The third flow guide assembly 302 is also located on the upper surface of the second body 301 along the first direction. The third flow guide assembly 302 includes a plurality of third flow guide grooves 3021, and one of all the third flow guide grooves 3021 is The third flow guide assembly 302 has one end connected to the liquid inlet area 3011 and the other end connected to the area where the battery module 200 is located, and is configured to disperse the coolant in the liquid inlet area 3011 and guide it to the battery module 200, and the flow guide plate 303 is also located on the upper side of the second body 301 along the first direction, and the flow guide plate 303 and the third flow guide assembly 302 are respectively adjacent to both ends of the second body 301 along the second direction, and a flow guide surface 3031 is provided on one side of the flow guide plate 303 close to the third flow guide assembly 302.

[0066] The tray 3 of this embodiment is provided with a liquid inlet area 3011 configured to receive the coolant from the liquid inlet port 101 of the battery case 100, and a third flow guide assembly 302 that disperses the coolant in the liquid inlet area 3011 before directing it to the battery modules 200. This allows the battery modules 200 to be more uniformly immersed in the coolant and dissipate heat through heat exchange, improving the heat dissipation effect of the battery modules 200. In addition, the tray 3 is provided with a flow guide plate 303 that can guide the coolant after heat exchange with the battery modules 200 to other areas for heat exchange or to the outside of the battery case 100, ensuring smooth heat exchange in other areas and reducing the probability of the coolant returning to battery modules 200 that have already completed heat exchange.

[0067] In this embodiment, the flow guide surface 3031 is an arcuate surface concave toward the side away from the third flow guide assembly 302. By making the flow guide surface 3031 an inwardly concave arcuate surface, the resistance of the coolant at the flow guide surface 3031 can be reduced, ensuring that the coolant can be quickly guided to another area for heat exchange or to the outside of the battery case 100. Of course, the flow guide surface 3031 is not limited to an inwardly concave arcuate surface and can also be an inclined surface. In one embodiment, the flow guide surface 3031 is inclined from one end closer to the second body 301 toward the end farther from the second body 301 and toward the side farther from the third flow guide assembly 302. That is, the flow guide surface 3031 is inclined from bottom to top toward the side farther from the third flow guide assembly 302. The inclined flow guide surface 3031 can also reduce the resistance of the coolant.

[0068] In one embodiment, the battery module 200 has multiple rows of battery cell groups 210 arranged along the third direction, and each row of the battery cell groups 210 has multiple battery cells 211 arranged along the second direction, and a current guide gap 220 is formed between at least two adjacent rows of the battery cell groups 210, and the multiple third current guide grooves 3021 and the multiple current guide gaps 220 correspond one-to-one. By arranging the flow guide gaps 220 between the battery cell groups 210 in a one-to-one correspondence with the third flow guide grooves 3021, the coolant that has been cooled externally can be diverted by the third flow guide grooves 3021 when it enters the liquid inlet area 3011. The flow guide gaps 220, which correspond to and communicate with the third flow guide grooves 3021, can receive the diverted coolant, increasing the opportunities for each battery cell 211 in each row of battery cell groups 210 to come into contact with the coolant and ensuring a uniform temperature drop. The coolant after heat exchange is guided by the flow guide surfaces 3031 to other areas for heat exchange or to the outside of the battery case 100, reducing the chance of the coolant after heat exchange with two adjacent rows of battery cell groups 210 returning or mixing between the battery cell groups 210 in the other rows, and further preventing the occurrence of situations where the heat exchange efficiency of a battery cell 211 is low.

[0069] In one embodiment, both end faces of the second body 301 along the third direction are spaced apart from the outer wall of the battery module 200, thereby forming flow guide gaps 220 on both sides of the battery module 200 along the third direction. In one embodiment, when installed, both sides of the battery module 200 along the third direction do not directly abut against the inner wall of the battery case 100 to avoid a situation in which the coolant is unable to infiltrate into certain parts of the battery cells 211, resulting in poor heat dissipation. The flow guide gaps 220 formed on both sides of the battery module 200 along the third direction also correspond to the third flow guide grooves 3021, so that the coolant that enters the liquid inlet region 3011 can also enter the flow guide gaps 220 on both sides of the battery module 200 along the third direction through the third flow guide grooves 3021 at this position, ensuring that the coolant infiltrates each battery cell 211 and performs heat exchange to dissipate heat, and further ensuring uniform heat exchange among all the battery cells 211.

[0070] In one embodiment, the third flow guide assembly 302 includes a plurality of spaced-apart third flow guide plates 3022, with a third flow guide groove 3021 formed between each pair of adjacent third flow guide plates 3022, one end of each third flow guide plate 3022 extending to the liquid inlet region 3011 and the other end extending to a region adjacent to the battery module 200. The outwardly protruding third flow guide plate 3022 reduces the overall thickness of the second body 301, thereby reducing the overall space occupied by the tray 3 in the battery case 100 and improving the energy density of the entire battery pack.

[0071] In one embodiment, the third flow guide plate 3022 and the second body 301 are integrally injection molded from plastic. The integral injection molding method reduces the difficulty of installing and manufacturing the third flow guide plate 3022, reduces the number of parts, and reduces costs. Of course, the third flow guide plate 3022 can also be manufactured separately and then fixed to the second body 301 by adhesive bonding, welding, screw connection, clasping, etc.

[0072] In another embodiment, instead of providing a separate third guide plate 3022, the thickness of the second body 301 may be increased and grooves may be drilled in the second body 301 to form the third guide grooves 3021. In this design, at least a portion of the battery cell 211 must be embedded within the second body 301; otherwise, the third guide grooves 3021 will not be able to effectively distribute and guide the coolant.

[0073] 9 (see also FIGS. 6-8, 15-17, 19, and 22), the third flow guide plate 3022 has a width L5 at one end adjacent to the liquid inlet region 3011 and a width L6 at one end adjacent to the battery cells 211, where L5 is smaller than L6. By widening the width of the third flow guide plate 3022 at the portion adjacent to the battery cells 211, it is possible to minimize the intrusion of the coolant in the flow guide gaps 220 into other regions. Meanwhile, the narrowing of the end adjacent to the liquid inlet region 3011 of the third flow guide plate 3022 is intended to achieve a converging effect. Because the liquid inlet region 3011 is generally designed to be smaller than the width of the battery module 200 (i.e., the size of the battery module 200 in the third direction), it is necessary to narrow the third flow guide assembly 302 so that the coolant can smoothly flow from the liquid inlet region 3011 into all of the third flow guide grooves 3021.

[0074] The shape of the end face of the third flow guide plate 3022 closest to the battery cell 211 matches the outer shape of the battery cell 211. This design allows the third flow guide plate 3022 to better fit the shape of the battery cell 211, providing a better flow guide effect and allowing the coolant in the third flow guide grooves 3021 to enter the flow guide gaps 220 with less resistance. In this embodiment, the battery cell 211 is a cylindrical battery cell, and the end face of the third flow guide plate 3022 closest to the battery cell 211 is an arcuate surface. Of course, the battery cell 211 is not limited to a cylindrical shape, and may be rectangular, polygonal, or irregular in shape. In this case, the shape of the end face of the third flow guide plate 3022 closest to the battery cell 211 can be adjusted according to the outer shape of the battery cell 211.

[0075] In addition, there is a gap between the end face of the third flow guide plate 3022 closest to the battery cell 211 and the outer wall of the battery cell 211. This design prevents the third flow guide plate 3022 from directly contacting the outer wall of the battery cell 211, allowing as much of the battery cell 211 as possible to come into contact with the coolant and exchange heat, and also prevents the third flow guide plate 3022 from blocking the battery cell 211.

[0076] In one embodiment, the second body 301 is provided with a protruding flow diverter 304 located in the liquid inlet region 3011. The flow diverter 304 diverts the coolant delivered through the liquid inlet 101, preventing a localized portion of the coolant from accelerating and rushing into one of the third flow guiding grooves 3021. The flow diverter 304 first diverts the coolant once, and the diverted coolant can be uniformly delivered to each of the third flow guiding grooves 3021. This ensures that each flow guiding gap 220 can provide coolant with the same temperature and flow rate, ensuring that each battery cell 211 has the same cooling effect, reducing the temperature difference between the battery cells 211, and extending the service life of the entire battery module 200.

[0077] In this embodiment, at least a portion of the outer wall of the flow diverting member 304 is an arcuate surface, and the cross-sectional size of the end of the flow diverting member 304 farther from the second body 301 is smaller than the cross-sectional size of the end of the flow diverting member 304 connected to the second body 301. The arcuate surface on the outer wall of the flow diverting member 304 reduces the splashing of the coolant transported from the liquid inlet 101 by the flow diverting member 304 and ensures that the coolant can be diverted along the outer wall of the flow diverting member 304. In addition, the small upper end and large lower end structure provides a good flow diverting effect, and the lower end of the flow diverting member 304 has a dispersed structure, ensuring that the coolant can be diverted evenly.

[0078] In one embodiment, as shown in FIG. 24 (see FIGS. 1 to 22), the two third flow guide plates 3022 positioned outermost along the third direction are third outer flow guide plates 30221, and one end of the two third outer flow guide plates 30221 that is far from the battery cells 211 is connected, and the remaining third flow guide plate 3022 is a third inner flow guide plate 30222, and one end of the third inner flow guide plate 30222 that is far from the battery cells 211 and the inner wall of the third outer flow guide plate 30221 are spaced apart to form a liquid inlet region 3011, and the flow diverting member 304 has a flow diverting outer peripheral surface 3042, a flow diverting bottom surface 3043, and a flow diverting top surface 3041, and the flow diverting top surface 3041 and the flow diverting bottom surface 3043 are spaced apart in the first direction, the flow diverting outer surface 3042 connects the flow diverting top surface 3041 and the flow diverting bottom surface 3043, and the flow diverting bottom surface 3043 is connected to the second body 301, the size of the flow diverting top surface 3041 is smaller than the size of the flow diverting bottom surface 3043, and the flow diverting outer surface 3042 has a connecting surface 30421 and a flow diverting guide surface 30422 which are connected to each other along the periphery of the flow diverting material 304, the connecting surface 30421 is connected to the inner surface of the third outer flow guide plate 30221, and the flow diverting guide surface 30422 is a tapered surface facing the third inner flow guide plate 30222. The structural form of the flow diverting material 304 is actually a half structure obtained by cutting a cone in half along its central axis. The flow diverting outer surface 3042 of the flow diverting member 304 is designed so that the connecting surface 30421 and the flow diverting guide surface 30422 are connected, so that the connecting surface 30421 can be connected to the third outer flow guide plate 30221 (the connecting surface 30421 is not exposed after connection), and the flow diverting guide surface 30422 has a tapered surface structure and is exposed from the flow diverting member 304. The tapered surface structure is used to divert the coolant from top to bottom, and the tapered surface structure minimizes the resistance and splashing of the coolant. This ensures that the coolant gradually disperses along the tapered surface structure from the smaller flow diverting top surface 3041 to the larger flow diverting bottom surface 3043. When the dispersed coolant enters the third flow guide grooves 3021, the coolant is distributed relatively evenly within each of the third flow guide grooves 3021.

[0079] In one embodiment, the second body 301 is provided with a plurality of mounting grooves 3012 into which the battery cells 211 are fitted. The provision of the mounting grooves 3012 makes it easier to secure the lower ends of the battery cells 211 to the tray 3, reducing the difficulty of securing the battery cells 211 and preventing the battery cells 211 from shifting out of position. In one embodiment, the battery cells 211 are secured in the mounting grooves 3012 with a sealant.

[0080] A first pressure relief hole 3013 is formed at the bottom of the mounting groove 3012, penetrating the second body 301. By providing the first pressure relief hole 3013 at the bottom of the mounting groove 3012, in the event of a battery cell 211 failure, the first pressure relief hole 3013 allows pressure from the battery cell 211 to be released and any spilled electrolyte or other substances to be discharged to the bottom of the tray 3, i.e., to one side of the tray 3 farther from the coolant, thereby preventing contamination of the coolant by electrolyte or other substances and preventing the failed battery cell 211 from affecting the remaining adjacent battery cells 211. In this embodiment, the battery cells 211 are secured in the mounting groove 3012 by a sealant, and the sealant's position at which the sealant is secured also serves as a seal, preventing the coolant from leaking from the upper region of the tray 3 to the lower region of the tray 3.

[0081] In one embodiment, second groove groups are provided on both end surfaces of the second body 301 in the third direction, and each second groove group includes a plurality of second grooves 3014 spaced apart in the second direction, with the second grooves 3014 recessed toward the area between two adjacent mounting grooves 3012. The provision of the second grooves 3014 can reduce the space at both ends of the second body 301 in the third direction. This is because, when the battery cells 211 of adjacent battery cell groups 210 have the same size, the widths of the current guide gaps 220 are the same. However, if the second grooves 3014 are not provided in the current guide gaps 220 located on both sides of the battery module 200 in the third direction, current guide gaps 220 with different widths will be formed, resulting in a mismatch in the temperature-reducing effect between the battery cells 211 on both sides of the battery module 200 and the middle battery module 200. In one embodiment, the second grooves 3014 are arc-shaped grooves, and two adjacent second grooves 3014 are connected by an arc-shaped second protrusion 3016, so that the end surface of the second body 301 along the third direction forms a wavy surface.

[0082] In one embodiment, a connecting protrusion 305 protrudes annularly from the periphery of the second body 301. The connecting protrusion 305 and the third inlet assembly 302 are located on the same side of the second body 301; that is, the connecting protrusion 305 protrudes from the upper side of the second body 301. The connecting protrusion 305 is recessed with a locking groove 3051 configured to lock onto the case body 1 of the battery case 100. The provision of the connecting protrusion 305 and the locking groove 3051 allows the tray 3 and the case body 1 to be manufactured separately and then connected by assembly, thereby reducing manufacturing difficulty. Specifically, during assembly, a sealant is disposed in the locking groove 3051, and the lower end of the case body 1 is inserted into the locking groove 3051 to achieve bonding and fixation with the sealant. After bonding, the sealant also seals the case body 1 and the tray 3, preventing leakage of coolant.

[0083] In other embodiments, the connecting protrusion 305 and the engaging groove 3051 are not limited to being connected to the case body 1, but may be directly welded to the case body 1, as shown in Figures 10 and 11, or the tray 3 and the case body 1 may be molded by integral injection or integral casting, etc.

[0084] 12 to 16 (some symbols are reused from those in FIGS. 6 to 8 and 17 to 22), an embodiment of the present application further provides a battery case 100, which includes a case body 1 having a storage chamber therein, and a tray 3 according to an embodiment of the present application, in which an opening 1014 is provided at the lower end of the case body 1 and the tray 3 closes this opening 1014, and the liquid inlet area 3011, third flow guide assembly 302, flow guide plate 303 and flow diverter 304 in the tray 3 are all provided within the storage chamber, and the case body 1 is further provided with a liquid inlet port 101 and a liquid outlet port 102, all of which communicate with the storage chamber, and of these, the liquid inlet port 101 is provided directly opposite the flow diverter 304 of the tray 3. After entering the case body 1 of the battery case 100 through the inlet 101, the coolant first passes through the diverting material 304 to be diverted once, and then passes through the multiple third guiding grooves 3021 to be diverted again. The coolant that enters the third guiding grooves 3021 enters the guiding gaps 220 of the battery module 200 and then merges with the flow guide plate 303, and is finally guided to other areas of the case body 1 by the flow guide surface 3031 or directly discharged through the outlet 102.

[0085] This battery case 100 effectively exchanges heat with and dissipates heat from each battery cell 211 in the battery module 200 through the current shunting, current conduction, and induction of the tray 3, thereby preventing phenomena such as deterioration over time caused by uneven heat dissipation in local battery cells 211 and extending the service life of the entire battery module 200.

[0086] In other embodiments, the first direction is not limited to being the vertical direction, but may be the horizontal direction, i.e., when the battery case 100 is placed vertically, the first direction is the horizontal direction, and further, the second direction is not limited to being the length direction of the battery case 100, and the third direction is not limited to being the width direction of the battery case 100, but may be the width direction of the battery case 100, and the third direction is the length direction of the battery case 100, and the specific direction limitations will not be repeated.

[0087] 17 to 22, an embodiment of the present application further provides a battery pack including a battery case 100 having a storage chamber therein, and a battery module 200 provided in the storage chamber. The specific structure of the battery case 100 will not be described repeatedly.

[0088] As shown in Figures 12 to 16 (see Figures 1 to 3, 6 to 8, and 17 to 22), an embodiment of the present application provides a battery case 100, and 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.

[0089] The following description will be given by way of example, taking the battery cells 211 of the battery module 200 mounted in the battery case 100 as cylindrical battery cells 211. The battery cells 211 are not limited to cylindrical battery cells 211, and may be rectangular, polygonal, or irregularly shaped. The specific structure of the battery cells 211 is not limited, and some structures of the battery case 100 are adaptively adjusted according to the shape of the battery cells 211, and will not be described again here.

[0090] In this embodiment, the battery case 100 includes a case body 1 and a separator 2, of which the case body 1 is provided with a liquid inlet 101 and a liquid outlet 102 spaced apart, a storage chamber configured to store a battery module 200 is provided within the case body 1, the separator 2 is provided within the storage chamber and divides the storage chamber into a first chamber 103 and a second chamber 104 distributed along a first direction, of which the first chamber 103 is located above the second chamber 104, and the separator 2 is provided with a plurality of mounting holes 2012 configured to mount battery cells 211 of the battery module 200, The separator 1 has two ends extending into the first chamber 103 and the second chamber 104, respectively, a return hole 2011 opened in the separator 2, the separator 2 has a liquid outflow area 2013 communicating with the liquid outflow port 102, the liquid outflow area 2013 is located in the first chamber 103, the liquid outflow area 2013 and the return hole 2011 are respectively close to both ends of the separator 2 along the second direction, the liquid outflow port 102 communicates with the liquid outflow area 2013, a liquid inflow area 3011 is located in the second chamber 104, the liquid inflow area 3011 and the liquid outflow area 2013 are located at the same end of the case body 1 along the second direction, the liquid inlet port 101 communicates with the liquid inlet area 3011, and the first direction and the second direction form an angle.

[0091] In the battery case 100 of the present embodiment, the separator 2 is used to divide the storage compartment within the case body 1 into an independent first chamber 103 and a second chamber 104. After the battery cells 211 are attached to the separator 2, the two chambers are sealed relative to each other. The coolant first enters the liquid inlet region 3011 of the second chamber 104 from the liquid inlet port 101, and then flows in the second direction from one end closest to the liquid inlet region 3011 to the other end furthest from the liquid inlet region 3011, successively immersing the portions of the battery cells 211 located in the second chamber 104, and dissipating heat through heat exchange with the battery cells 211. The coolant then enters the first chamber 103 through the return holes 2011 in the separator 2, and The coolant is gradually immersed in the battery cells 211 located in the first chamber 103 from the side where the return hole 2011 is located toward the liquid outflow area 2013, exchanging heat with the remaining parts of the battery cells 211 to exchange heat. After heat exchange, the coolant merges with the liquid outflow area 2013 and is then discharged through the liquid outflow port 102. Throughout the process, the coolant gradually exchanges heat with the battery cells 211 of the battery module 200. The special infiltration path of the coolant (similar to a U-shape, i.e., the path indicated by the arrows in FIG. 22 ) increases the probability of contacting the coolant with each battery cell 211, improving the uniformity and effectiveness of heat exchange for all battery cells 211 and extending the service life of the battery cells 211.

[0092] In this 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 including multiple battery cells 211 arranged along the second direction, with the battery cell groups 210 of two adjacent rows being staggered. This design allows the battery modules 200 to be arranged more tightly, resulting in higher space utilization within the battery case 100 and ensuring a higher energy density for the battery pack formed after the battery modules 200 are assembled.

[0093] The battery case 100 may be provided with only the separator 2, and the specific structure of the separator 2 is as described in the examples of the present application, and the specific structure of the separator 2 will not be described again here.

[0094] The battery case 100 may be provided with both a separator 2 and a tray 3. In one embodiment, the tray 3 is connected to the case body 1, and the tray 3 and the separator 2 are spaced apart, forming a second chamber 104 therebetween; that is, the tray 3 is attached to the bottom of the second chamber 104. The specific structure of the separator 2 is as described in the examples of the present application, and the specific structure of the tray 3 is as described in the examples of the present application. Therefore, the specific structures of the separator 2 and the tray 3 will not be described again here.

[0095] The following description will be given taking as an example a battery case 100 provided with both a separator 2 and a tray 3.

[0096] The separator 2 is fixed to the center of the battery cell 211 in the first direction (i.e., the center in the vertical direction), and in this case, the lengths of the battery cell 211 located in the first chamber 103 and the second chamber 104 are the same.

[0097] In this embodiment, the height of the second chamber 104 in the first direction is H1, the liquid level of the coolant in the accommodating chamber in the first direction is H2, and the size of the battery cell 211 in the first direction is H3. The ratio of H1, H2, and H3 can be 2:5:5 or 1:4:4. This ratio design is advantageous because the height of the second chamber 104 is lower than the height of the first chamber 103, which increases the flow rate of the coolant in the second chamber 104 and further accelerates the flow of the coolant into the first chamber 103 to cool the battery cell 211, thereby improving the overall heat exchange efficiency of the battery cell 211. In other embodiments, the height of the second chamber 104 is not limited to being smaller than the height of the first chamber 103, and the heights of the second chamber 104 and the first chamber 103 may be the same. That is, the separator 2 is located in the center of the case body 1 in the first direction, so that the heights of the first chamber 103 and the second chamber 104 are the same.

[0098] The liquid inlet 101 and the liquid outlet 102 are located on the same side of the case body 1 in the first direction, close to the first chamber 103, and both are close to one end where the liquid outflow region 2013 is located. By providing the liquid inlet 101 and the liquid outlet 102 on the same side of the case body 1 in the first direction, i.e., on the upper or lower side of the battery case 100, the liquid inlet 101 and the liquid outlet 102 do not occupy space in the horizontal direction of the battery case 100, allowing the battery case 100 to be arranged more closely and increasing space utilization rate. By providing the liquid inlet 101 and the liquid outlet 102 at one end close to the liquid outflow region 2013, the length of piping within the battery case 100 can be shortened, saving costs and reducing the space occupation rate within the battery case 100. In one embodiment, the inlet 101 and outlet 102 are located on the upper side of the battery case 100, and this design allows the coolant to flow down along the flow when it enters and reach the second chamber 104 located below, and then the coolant in the second chamber 104 fills the entire second chamber 104 before flowing into the first chamber 103 through the return hole 2011.

[0099] In other embodiments, the liquid inlet port 101 and the liquid outlet port 102 do not have to be provided on the same side of the case body 1, but may be provided on different sides. For example, the liquid inlet port 101 is provided on the lower side of the battery case 100, and the liquid outlet port 102 is provided on the upper side of the battery case 100, or the liquid inlet port 101 and the liquid outlet port 102 are provided on the left and right or front and rear sides of the battery case 100.

[0100] In one embodiment, the battery case 100 further includes a first closing plate 4 and a second closing plate 5. An opening 1014 is provided at both ends of the case body 1 in the first direction, of which the lower end of the case body 1 in the first direction is closed by a tray 3. A pressure relief groove 3015 is recessed into one side of the tray 3 that is farther from the separator 2. The tray has a plurality of mounting grooves in which the battery cells are fitted, and a first pressure relief hole 3015 is provided at the bottom of the mounting groove. 3013 is opened (i.e., a first pressure relief hole 3013 is opened in the tray 3 corresponding to each battery cell 211), the first pressure relief hole 3013 is connected to this pressure relief groove 3015, and a first closure plate 4 is connected to the side of the tray farther from the separator to close the groove opening of this pressure relief groove 3015, and an opening 1014 at the upper end along the first direction of the case body 1 is closed by a second closure plate 5, thereby forming a sealed battery case 100. The pressure relief groove 3015 allows communication with the first pressure relief hole 3013 of the tray 3, and the first pressure relief hole 3013 corresponds to the position of the battery cell 211. If a battery cell 211 malfunctions and pressure needs to be released, substances such as electrolyte that have leaked from the battery cell 211 can enter the pressure relief groove 3015 through the first pressure relief hole 3013. The first closing plate 4 prevents the pressure relief groove 3015 from being opened and exposed, ensures that the pressure relief groove 3015 can store and seal substances such as electrolyte that have leaked from the battery cell 211, and prevents adjacent battery cases 100 from affecting each other and causing environmental pollution. The opening 1014 and second closing plate 5 facilitate the installation of components such as the separator 2 and battery modules 200, and also facilitates later maintenance of the components inside the battery case 100.

[0101] In one embodiment, a plurality of support posts 306 are provided protruding from the bottom of the pressure relief groove 3015, and the support posts 306 are located between adjacent first pressure relief holes 3013, and one end of the pressure relief groove 3015 far from the bottom is in close contact with the inside of the first blocking plate 4. By providing the support posts 306, the support posts 306 can be used to support the first blocking plate 4, and deformation of the first blocking plate 4 can be prevented.

[0102] The case body 1 has an opening 1014 communicating with the storage chamber at its upper end along the first direction, and an attachment portion 1010 formed at its end so as to extend to the center of the opening 1014, and the opening 1014 is closed by connecting the second closure plate 5 to the attachment portion 1010. By providing the attachment portion 1010, a position at the upper side of the case body 1 at which the second closure plate 5 can be easily attached can be formed. In one embodiment, the attachment portion 1010 has a ring-shaped sealing groove 1011 formed around the periphery of the opening 1014, a sealant is provided in the sealing groove 1011, and the second closure plate 5 is connected to the attachment portion 1010 by the sealant. In one embodiment, a step 1012 is formed in an annular shape on the inner wall of the mounting portion 1010, with a gap between the step 1012 and one side of the mounting portion 1010 facing away from the receiving chamber (i.e., the step 1012 is recessed inward, with a gap between the upper surface of the step 1012 and the upper surface of the mounting portion 1010). The second closure plate 5 abuts against the step 1012, and a sealing groove 1011 is formed in the step 1012. The step 1012 regulates the mounting position of the second closure plate 5, ensuring that the second closure plate 5 can accurately seal the opening 1014 and effectively preventing the second closure plate 5 from shifting. In addition to using adhesive bonding to secure the second closure plate 5, it may also be secured by combining screws and a seal ring, or by combining a fastening structure and a seal ring. The detachable connection method makes it easy to attach and detach the second closure plate 5, and facilitates installation and maintenance of the battery module 200 inside the battery case 100.

[0103] In this embodiment, the inlet port 101 and the outlet port 102 are provided on the mounting portion 1010. The mounting portion 1010 is also provided with an inlet joint 6 corresponding to the inlet port 101 and an outlet joint 7 corresponding to the outlet port 102. The inlet joint 6 and the outlet joint 7 are used to connect to an external duct, thereby achieving circulating cooling of the coolant. Furthermore, by providing both the inlet port 101 and the outlet port 102 on the mounting portion 1010, it is possible to prevent the duct from being obstructed or pulled when the second closure plate 5 is attached or detached. The inlet joint 6 and the outlet joint 7 may be quick-detachable joints to enable quick attachment and detachment of the duct. In other embodiments, both the inlet port 101 and the outlet port 102 may be provided on the second closure plate 5, or both the inlet port 101 and the outlet port 102 may be provided on the mounting portion 1010 and the second closure plate 5, respectively.

[0104] Furthermore, liquid inlet 101 communicates with second chamber 104 via liquid inlet pipe 204, which is provided within first chamber 103, and separator 2 has via hole 2017 formed therein that communicates with liquid inlet pipe 204, which passes through separator 2. To facilitate maintenance and prevent leakage, liquid supply pipe 204 may be fixed directly to separator 2. In another embodiment, liquid inlet pipe 204 may be provided separately, and after separator 2 is attached, both ends of liquid inlet pipe 204 tightly contact mounting portion 1010 and separator 2, respectively. In addition, the liquid inlet pipe 204 may be designed to pass directly through the via hole 2017, i.e., a portion of the liquid inlet pipe 204 is located within the first chamber 103 and tightly abuts against a position corresponding to the liquid inlet port 101 of the mounting portion 1010, and another portion extends into the second chamber 104.In this case, it is necessary to seal the outer wall of the liquid inlet pipe 204 and the hole wall of the via hole 2017 to prevent the coolant in the first chamber 103 from passing through the gap between the outer wall of the liquid inlet pipe 204 and the hole wall of the via hole 2017 and entering the second chamber 104.

[0105] In one embodiment, the case body 1 has a first side plate 105 and a second side plate 106 distributed along the third direction, and the inner surfaces of the first side plate 105 and the second side plate 106 are each provided with a plurality of third grooves 107 spaced apart along the second direction. The shape of the third grooves 107 matches the shape of the outer walls of the battery cells 211 on the outer side of the battery module 200 along the third direction, and there is a gap between the outer walls of the battery cells 211 and the groove walls of the third grooves 107. A protruding structure 108 is formed between the grooves 107. The protruding structure 108 is inserted into the area between two adjacent battery cells 211 along the second direction, and there is a gap between the protruding structure 108 and the outer wall of the battery cell 211. The two end faces of the separator 2 along the third direction are tightly abutted and sealed against the inner walls of the first side plate 105 and the second side plate 106, respectively, so that the shapes of the two end faces of the separator 2 along the third direction match the shapes of the first side plate 105 and the second side plate 106. In one embodiment, in order to ensure sealing of the connection position between the separator 2 and the first side plate 105 and the second side plate 106 of the case body 1, a first protrusion 2014 is provided on the end surface of the separator 2 along the third direction corresponding to the third groove 107, and a first groove 2016 is provided corresponding to the protrusion structure 108, and the outer wall of the first protrusion 2014 is closely abutted against the groove wall of the third groove 107, and the outer wall of the protrusion structure 108 is closely abutted against the groove wall of the first groove 2016, forming a tight and tight abutment structure.

[0106] The first side plate 105 and the second side plate 106 are corrugated plates, and groove structures 109 are formed on the outer surfaces of the first side plate 105 and the second side plate 106 corresponding to the protruding structures 108, so that the two end faces of the separator 2 along the third direction form corrugated surfaces. By making the first side plate 105 and the second side plate 106 corrugated plates, it is possible to save space in the third direction of the battery case 100.

[0107] To facilitate the assembly of the battery cells 211, in addition to utilizing the limitations of the separators 2, mounting grooves 3012 may be formed on the tray 3. The number and arrangement of the mounting grooves 3012 are determined according to the number and arrangement of the battery cells 211 in the battery module 200. The lower ends of the battery cells 211 are inserted into the mounting grooves 3012. First pressure relief holes 3013 are formed at the bottoms of the mounting grooves 3012 and penetrate the second body 301 of the tray 3 in a first direction (i.e., penetrate the thickness of the second body 301). After the battery cells 211 are assembled on the tray 3, a sealant is provided between the groove walls of the mounting grooves 3012 and the outer walls of the battery cells 211 to prevent the coolant from leaking from between the outer walls of the battery cells 211 and the groove walls of the mounting grooves 3012 to the side away from the second chamber 104 of the tray 3 (i.e., to prevent the coolant from leaking to the outside bottom of the tray 3).

[0108] The case body 1 is provided with a second pressure relief hole 1013 that connects the pressure relief groove 3015 to the outside of the case body 1. By providing the second pressure relief hole 1013, substances such as electrolyte that are released when a battery cell 211 in the pressure relief groove 3015 fails and pressure is released can be discharged to the outside of the case body 1. In one embodiment, the second pressure relief hole 1013 is provided in one of the side surfaces of the case body 1 that are aligned in the second direction. In another embodiment, the second pressure relief hole 1013 is not limited to being provided in a side surface of the case body 1 that is aligned in the second direction, and may also be provided in a side surface of the case body 1 that is aligned in the third direction (i.e., the first side panel 105 and / or the second side panel 106).

[0109] In one embodiment, the projections of the return holes 2011 in the separator 2 along the first direction at least partially overlap with the flow guide surface 3031 of the flow guide plate 303 of the tray 3, and this design allows the coolant guided upward by the flow guide surface 3031 to pass through the return holes 2011 and enter the first chamber 103 as quickly as possible, reducing the time the coolant spends in the second chamber 104 and accelerating the circulation of the coolant. In one embodiment, the projections of the return holes 2011 along the first direction all overlap with the flow guide surface 3031.

[0110] In one embodiment, the tray 3 and the case body 1 are fixedly connected. This fixed connection method reduces the difficulty of assembly and prevents the occurrence of coolant leakage at the connection position between the tray 3 and the case body 1. In one embodiment, the tray 3 and the case body 1 are molded by a one-piece manufacturing molding method, which is easy to operate, has no joint gaps, and has a good leakage prevention effect. In one embodiment, the tray 3 and the case body 1 are molded by a one-piece injection molding method.

[0111] Of course, the tray 3 and the case body 1 are not limited to being fixedly connected, but may also be detachably connected. In one embodiment, the tray 3 is provided with a locking groove 3051, and one end of the case body 1 along the first direction is inserted into the locking groove 3051. A sealant is provided in the locking groove 3051, and the sealant adhesively bonds the case body 1 and the tray 3 to seal the connection position between the case body 1 and the tray 3. The selective use of the sealant not only achieves connection and fixation, but also provides good sealing. In one embodiment, a ring-shaped connection protrusion 305 is provided on the upper surface of the tray 3, and the locking groove 3051 is opened in the connection protrusion 305.

[0112] As shown in Figures 17 to 22 (some symbols are reused from Figures 1 to 3, 6 to 8, and 12 to 16), an embodiment of the present application further provides a battery pack comprising a battery case 100 and a battery module 200 hermetically mounted within the battery case 100, wherein the battery case 100 is the battery case 100 according to an embodiment of the present application.

[0113] In one embodiment, after the battery module 200 is installed in the battery case 100, the lower ends of the battery cells 211 of the battery module 200 are in close contact with the tray 3 inside the battery case 100, and there is a gap between the upper ends of the battery cells 211 and the second closure plate 5 to form a space in which components such as bus bars can be installed. The separator 2 is engaged in the middle of the length of the battery cells 211, i.e., the middle of the battery cells 211 along the first direction. As a result, the lengths of the battery cells 211 in the first chamber 103 and the second chamber 104 are the same, ensuring uniform heat dissipation.

[0114] The present embodiment is Step S100 of providing a coolant, the coolant entering the second chamber 104 through the liquid inlet 101 of the battery case 100, and immersing the portion of the battery cell 211 located in the second chamber 104 in a second direction from one end of the second chamber 104 where the liquid inlet region 3011 is provided toward one end farther from the liquid inlet region 3011; Step S200: the coolant in the second chamber 104 enters the first chamber 103 through the return hole 2011 in the separator 2, and flows in the second direction from one end of the first chamber 103 where the return hole 2011 is provided toward one end where the liquid outflow region 2013 is located, immersing the portion of the battery cell 211 located in the first chamber 103; The cooling method further includes a step S300 in which the cooling liquid joins the outflow area 2013 and is then discharged through the outflow port 102.

[0115] In one embodiment, step S100 includes: Step S110 in which the coolant enters through the inlet 101 of the battery case 100, passes through the inlet pipe 204, and enters the second chamber 104; Step S120: the coolant first contacts the flow diverting member 304 to achieve flow diverting and then uniformly distributes the coolant to each of the third flow diverting grooves 3021 of the third flow diverting assembly 302; step S130, in which the coolant in the third guide groove 3021 is transported into the corresponding guide gap 220 of the battery module 200, and exchanges heat with the lower half of each battery cell 211 on one or both sides of the guide gap 220, and the transport direction of the coolant is from one end of the second chamber 104 where the liquid inlet region 3011 is provided to one end farther from the liquid inlet region 3011 along the second direction; Step S200 is Step S210: the coolant that has been heat-exchanged and exited from the flow guide gap 220 comes into contact with the flow guide surface 3031 of the flow guide plate 303, and is guided by the flow guide surface 3031 to the return hole 2011 in the separator 2; Step S220: the coolant enters the first chamber 103 through the return hole 2011 and flows toward the liquid outflow region 2013 by the flow guide of the blocking plate flow guide surface 2051 of the blocking plate 205; Step S230: the coolant is guided through the second guide grooves 2031 of the second guide assembly 203 into the corresponding guide gaps 220, and exchanges heat with the upper half of each battery cell 211 on one or both sides of the guide gaps 220; Step S240 includes the coolant in the guide gap 220 entering the first guide grooves 2021 of the first guide assembly 202, and joining into the outflow area 2013 through all the first guide grooves 2021.

[0116] In addition, after the coolant is discharged into the battery case 100, the coolant may be cooled using external refrigeration equipment, and the cooled coolant may be circulated again to the liquid inlet 101, thereby cooling the battery module 200 inside the battery case 100 again.

[0117] The separators 2 and trays 3 in the battery case 100 are not limited to being distributed vertically, but may be distributed horizontally; that is, the first direction may be horizontal; the second direction is not limited to being the length direction of the battery case 100; the third direction is not limited to being the width direction of the battery case 100; the second direction may be the width direction of the battery case 100, and the third direction may be the length direction of the battery case 100. When the first direction is horizontal, the first chamber 103 and the second chamber 104 may be arranged left and right or right and left, The coolant flows in the direction shown in Figure 22 (in the direction of the arrow), entering from the second chamber 104 and then seeping from bottom to top, lowering the temperature of the portion of the battery cell 211 located within the second chamber 104. When the coolant reaches the top of the second chamber 104, it passes through the return hole 2011 and enters the first chamber 103, flows from top to bottom in the first chamber 103, and seeps into the portion of the battery cell 211 located within the first chamber 103, lowering its temperature, and is finally discharged to the outside of the battery case 100 from the outlet 102 at the bottom of the first chamber 103.

[0118] Of course, the first direction is not limited to horizontal, and may form a certain angle with the horizontal. For specific cooling paths of the coolant, please refer to the previous example, and the description will not be repeated here. [Explanation of symbols]

[0119] 100···Battery case, 1. Case body, 101... liquid inlet, 102... liquid outlet, 103... first chamber, 104... second chamber, 105... first side plate, 106... second side plate, 107... third groove, 108... protruding structure, 109... groove structure, 1010... mounting portion, 1011... sealing groove, 1012... step, 1013... second pressure relief hole, 1014... opening, 2. Separator, 201...1st body, 2011...reflux hole, 20111...arc shaped hole wall, 20112...plane hole wall, 2012...installation hole, 2013...liquid outflow area area, 2014...1st convexity, 2015...immersion hole, 2016...1st groove, 2017...via hole, 2018...merging groove, 202...1st channel Flow assembly, 2021...First guide groove, 2022...First guide plate, 20221...First outer guide plate, 20222...First inner guide plate, 203... Second flow guide assembly, 2031...Second flow guide groove, 2032...Second flow guide plate, 204...Liquid inlet pipe, 205...Blocking plate, 2051...Blocking plate flow guide surface, 3···tray, 301... Second body, 3011... Liquid inlet area, 3012... Mounting groove, 3013... First pressure relief hole, 3014... Second recessed groove, 3015... Pressure relief groove, 3016... Second protrusion, 302... Third flow guide assembly, 3021... Third flow guide groove, 3022... Third flow guide plate, 30221... Third outer flow guide plate, 30222···Third inner flow guide plate, 303···Flow guide plate, 3031···Flow guide surface, 304···Flow diverter material, 3041···Flow diverter top surface, 3042···Flow diverter outer peripheral surface, 30421···Connection surface, 30422···Flow diverter guide surface, 3043···Flow diverter bottom surface, 305···Connection protrusion, 3051···Engagement groove, 306···Support column, 4... First blocking plate, 5... Second blocking plate, 6... Inlet joint, 7... Outlet joint, 200: Battery module, 210: Battery cell group, 211: Battery cell, 220: Current conduction gap.

Claims

1. The battery case includes a first body and a first current-directing assembly, the first body has a return hole and a plurality of mounting holes formed along a first direction and configured to mount battery cells of a battery module; the first body has a liquid outflow region formed on one of its side surfaces along the first direction and configured to communicate with a liquid outflow port of the battery case; the liquid outflow region and the return hole are respectively adjacent to both ends of the first body along a second direction; the mounting hole is located between the liquid outflow region and the return hole; and the first direction and the second direction form an angle; the first flow guide assembly and the outflow area are located on the same side of the first body, and the first flow guide assembly has a plurality of first flow guide grooves, all of whose first ends communicate with the outflow area and whose second ends communicate with the area where the battery modules are located, and is configured to introduce the coolant in the area where the battery modules are located into the outflow area; Separator.

2. the battery module has a plurality of rows of battery cell groups arranged along a third direction, each row of the battery cell groups including a plurality of the battery cells arranged along the second direction, the third direction being arranged at an angle with each of the first direction and the second direction, a current guide gap being formed between at least two adjacent rows of the battery cell groups, and the plurality of first current guide grooves and the plurality of current guide gaps being in one-to-one correspondence; The separator according to claim 1 .

3. a gap is formed between each of the two side edges of the first body and the hole wall of the mounting hole along the third direction, thereby forming the current guide gap on both sides of the battery module along the third direction; The separator according to claim 2 .

4. the first flow guide assembly includes a plurality of first flow guide plates spaced apart from one another, the first flow guide grooves being formed between two adjacent first flow guide plates, and the first ends of the first flow guide plates extending to the liquid outflow region and the second ends extending to a region adjacent to the battery modules; The separator according to claim 2 .

5. The first flow guide plate is The width of the first end is L1, the width of the second end is L2, and L1 is smaller than L2; and / or the shape of the end face of the second end matches the outer shape of the battery cell; and / or the end face of the second end is spaced apart from the outer wall of the battery cell; The separator according to claim 4.

6. A joining groove communicating with each of the first guide grooves is recessed in a portion of the first body located in the liquid outflow region. The separator according to claim 1 .

7. the first flow guide assembly includes a plurality of first flow guide plates spaced apart from one another, and the first flow guide groove is formed between two adjacent first flow guide plates; two first flow guide plates positioned outermost of the first flow guide assembly along the third direction are first outer flow guide plates, one end of each of the first outer flow guide plates farther from the battery cells is connected to the other first flow guide plate, and one end of each of the first inner flow guide plates closer to the first outer flow guide plate is spaced apart from an inner wall of the first outer flow guide plate to form the outflow region; The separator according to claim 1 .

8. The first body has a dip hole formed therethrough along the first direction, the dip hole being located between adjacent mounting holes and corresponding to a gap between adjacent battery cells, and the size of the dip hole being smaller than the size of the return hole. The separator according to any one of claims 1 to 7.

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

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

11. The first body is provided with a second flow guide assembly, the second flow guide assembly being adjacent to the return hole and located on the same side of the first body as the first flow guide assembly, and including a plurality of second flow guide grooves, each of which connects the return hole with an area where the battery module is located. The separator according to any one of claims 1 to 7.

12. the battery module has a plurality of rows of battery cell groups arranged along a third direction, each row of the battery cell groups including a plurality of the battery cells arranged along the second direction, the third direction being arranged at an angle with each of the first direction and the second direction, a current guide gap being formed between at least two adjacent rows of the battery cell groups, and the second current guide grooves and the current guide gaps being in one-to-one correspondence with each other; The separator according to claim 11.

13. the second flow guide assembly includes a plurality of second flow guide plates spaced apart from one another, the second flow guide groove being formed between two adjacent second flow guide plates, a first end of each second flow guide plate extending to a region adjacent to the battery cell, and at least one return hole being disposed between two adjacent second flow guide plates; The separator according to claim 12.

14. The second flow guide plate is a width of a second end far from the liquid outflow region is L3, a width of a first end close to the liquid outflow region is L4, and L3 is smaller than L4; and / or the shape of the end face of the first end matches the outer shape of the battery cell; and / or the end face of the first end is spaced apart from the outer wall of the battery cell; The separator according to claim 13.

15. The first body is provided with a liquid inlet pipe fixed to the liquid outlet region, and a via hole is opened in the liquid outlet region and communicates with the liquid inlet pipe and passes through the first body. The separator according to any one of claims 1 to 7.

16. The first body has a plurality of return holes spaced apart along a third direction, or the return holes are provided to extend along the third direction, the first body further includes a closing plate located between the return hole and an end face of the first body adjacent to the return hole along the second direction, the closing plate having a length extending along the third direction, and the closing plate protruding from one side of the first body on which the first flow guide assembly is provided; The separator according to any one of claims 1 to 7.

17. a slanted blocking plate flow guide surface is provided on one side of the blocking plate close to the return hole, the blocking plate flow guide surface extending in the first direction from one end close to the first body to one end far from the first body, and slanting in the second direction toward the first flow guide assembly; The separator of claim 16.

18. a first groove group including a plurality of first grooves recessed toward a region between two adjacent mounting holes spaced apart along the second direction is provided on each of both end surfaces of the first body along the third direction; The separator according to any one of claims 1 to 7.

19. A case body and a separator are provided. the case body is provided with a liquid inlet and a liquid outlet at an interval, and a housing chamber configured to house a battery module is provided within the case body; the separator is provided within the storage chamber and divides the storage chamber into a first chamber and a second chamber distributed along a first direction, the separator has a plurality of mounting holes configured to allow battery cells of the battery module to be mounted therein, both ends of the battery cell in the first direction extend into the first chamber and the second chamber, respectively, the separator has a return hole, the separator has a liquid outflow region communicating with the liquid outflow port, the liquid outflow region is located within the first chamber, the liquid outflow region and the return hole are respectively close to both ends of the separator in the second direction, the liquid outflow port communicates with the liquid outflow region, a liquid inflow region is provided within the second chamber, the liquid inflow region and the liquid outflow region are respectively close to the same end of the case body in the second direction, the liquid inflow port communicates with the liquid inflow region, and the first direction and the second direction form an angle. Battery case.

20. A battery module and a battery case are provided. The battery module is hermetically mounted in the battery case, and the battery case is the battery case according to claim 19. Battery pack.

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