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] This application relates to the technical field of batteries, for example, to separators, battery cases, and battery packs including such battery cases.

Background Art

[0002] A battery pack generally includes a battery case and a battery module provided in the battery case. The battery module is formed by arranging several battery cells in a set manner. Heat dissipation of the battery pack is extremely important. The quality of the heat dissipation effect directly affects the service life of the battery pack. Currently, the battery pack adopts heat dissipation methods such as air cooling, heat dissipation by a water cooling plate, and heat dissipation by immersion in a coolant. In the heat dissipation method by immersion in a coolant, a method is adopted in which the coolant is directly sent into the battery case and contacts the battery cell housing for heat exchange. Currently, in such a heat dissipation method, generally, an inlet is provided at one end in the length direction of the battery case, and an outlet is provided at the other end. The coolant is drawn into the inlet, immerses the battery cells, and then flows out from the outlet, is cooled outside the battery case, and is transported to the inlet after cooling to circulate so as to cool the battery cells of the battery module.

[0003] In related technologies, after the coolant enters the battery case, it can contact more coolant with a lower temperature at a position closer to the inlet, but at a position farther from the inlet, there is less contact with the coolant with a lower temperature, and thus it cannot contact the coolant with a lower temperature. Therefore, some battery cells in the battery case cannot be immersed in the coolant with a lower temperature, and it is easy for a poor heat exchange effect to occur in this part of the battery cells. The battery cells with a poor heat exchange effect are prone to aging over time and the capacity decreases early, so there is a situation where the service life of the battery pack decreases.

Summary of the Invention

Problems to be Solved by the Invention

[0004] The embodiment of the present invention provides a separator that can increase the flow effect of the cooling liquid in the battery case, improve the heat exchange effect of each battery cell, and extend the service life of the battery cells.

[0005] An embodiment of the present invention provides a tray that can extend the service life of battery cells by dispersing the coolant inside the battery case so that each battery cell can be uniformly immersed in the coolant at a low temperature, thereby reducing the probability of the coolant flowing back to battery cells that have already completed heat exchange.

[0006] The embodiments of this invention provide a battery case with a simple structure, uniform heat exchange of battery cells, and a battery pack with a long service life.

[0007] The embodiment of the present invention provides a method for cooling a battery pack that can effectively improve the uniformity of the heat dissipation effect of each battery cell in the battery pack, thereby extending 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 that is applied to a battery case and comprises a first body and a first flow guide assembly, The first body has a recirculation hole and a plurality of mounting holes configured for mounting battery cells of a battery module, which are provided through the first body along a first direction, and the first body has a liquid outlet region formed on one of its sides along the first direction, which is configured to communicate with the liquid outlet of the battery case, and the liquid outlet region and the recirculation hole are close to both ends of the first body along a second direction, and the mounting holes are located between the liquid outlet region and the recirculation hole, and the first direction and the second direction are provided at a narrow angle. The first flow guide assembly and the liquid outlet region are located on the same side surface of the first body, and the first flow guide assembly is provided with a plurality of first flow guide grooves, all of which have first ends communicating with the liquid outlet region and second ends communicating with the region where the battery module is located, and is configured to introduce the coolant in the region where the battery module is located into the liquid outlet region.

[0009] In a second aspect, an embodiment of the present application is applied to a battery case and provides a tray comprising a second body, a third flow guide assembly, and a flow guide plate. The second body is provided with an electrolyte inlet area configured to communicate with the electrolyte inlet of the battery case, and is located on one of the sides of the second body along the first direction. The third flow guide assembly and the fluid inlet region are located on the same side of the second body, and the third flow guide assembly is provided with a plurality of third flow guide grooves, all of which have first ends communicating with the fluid inlet region and second ends communicating with the region where the battery module is located, and is configured to disperse the coolant in the fluid inlet region and guide it to the battery module. The flow guide plate and the third flow guide assembly are located on the same side surface of the second body along the first direction, and are close to both ends of the second body along the second direction, and a flow guide surface is provided on one side surface of the flow guide plate that is close to the third flow guide assembly.

[0010] In a third aspect, the embodiment of the present application provides a battery case comprising a case body and a separator. The case body is provided with an inlet and an outlet at a distance from each other, and the case body is provided with a housing chamber configured to house a battery module. The separator is provided within the housing chamber and divides the housing chamber into a first chamber and a second chamber distributed along a first direction. The separator has a plurality of mounting holes configured for mounting the battery cells of the battery module, with both ends of the battery cells extending into the first chamber and the second chamber, respectively. The separator has a recirculation hole, and the separator has a liquid outlet region that communicates with the liquid outlet, the liquid outlet region located within the first chamber, the liquid outlet region and the recirculation hole being close to both ends of the separator along a second direction, the liquid outlet communicating with the liquid outlet region. The second chamber has an inlet region, the inlet region and the liquid outlet region being close to the same end of the case body along a second direction, the inlet communicating with the inlet region, and the first direction and the second direction are provided at a narrow angle.

[0011] In the fourth aspect, an embodiment of the present application provides a battery pack comprising a battery module and a battery case, wherein the battery module is sealed within the battery case, and the battery case is the battery case described in the third aspect.

[0012] In the fifth aspect, the embodiment of the present application is applied to the battery pack described in the fourth aspect. A step of providing a coolant, such that the coolant enters the second chamber from the inlet of the battery case, and immerses the portion of the battery cell located in the second chamber, from one end of the second chamber where the inlet area is provided toward the end furthest from the inlet area, along the second direction, The cooling liquid in the second chamber enters the first chamber through the reflux holes in the separator, and the portion of the battery cell located in the first chamber is immersed in the second direction, moving from one end of the first chamber where the reflux holes are provided toward the other end where the liquid discharge area is located. The present invention provides a method for cooling a battery pack, which includes the step of having the cooling liquid merge with the outlet region and be discharged through the outlet of the battery case. [Effects of the Invention]

[0013] The beneficial effects of this invention are as follows: By providing a recirculation hole through the first body, the coolant on one side of the first body that is separated from the outlet region can be drawn into the side of the first body where the outlet region is provided through this recirculation hole. Furthermore, since the recirculation hole and the outlet region are provided at both ends of the first body along the second direction, the coolant sequentially immerses the battery cells protruding from the first body from the position where the recirculation hole is located, undergoes heat exchange, and then merges with the outlet region and can be discharged from the outlet, thereby increasing the heat exchange effect of the battery cells. In addition, since a first flow guide assembly is provided between the outlet region and the battery module, all of the coolant that has completed heat exchange in the battery cells can be merged with the outlet region as quickly as possible, accelerating the discharge of the high-temperature coolant after heat exchange and improving the cooling effect.

[0014] The beneficial effects of this invention are as follows: By providing an inlet region configured to receive coolant from the battery case inlet, and a third flow guide assembly in the tray that disperses the coolant in the inlet region before guiding it to the battery module, the battery module can be uniformly immersed in the coolant and dissipate heat through heat exchange, thereby improving the heat dissipation effect of the battery module. Furthermore, by providing a flow guide plate that can guide the coolant, after heat exchange with the battery module, to another region or to the outside of the battery case, heat exchange in other regions can be carried out smoothly, and the probability of the coolant flowing back to the battery module, which has already completed heat exchange, is reduced.

[0015] The beneficial effects of the present application are as follows. A separator is provided to partition the accommodation chamber in the case body into an independent first chamber and a second chamber. After the battery cells are attached to the separator, the two chambers are relatively sealed. The cooling liquid enters from the liquid inlet, first enters the liquid inlet area of the second chamber, and then, along the second direction, from the end closer to the liquid inlet area to the end farther from the liquid inlet area, sequentially immerses the part of the battery cell located in the second chamber of the battery cell, exchanges heat with the battery cell to dissipate heat, and then enters the first chamber through the reflux hole in the separator, and from the side where the reflux hole is located towards the liquid outlet area, sequentially immerses the part of the battery cell located in the first chamber of the battery cell, exchanges heat with the remaining part of the battery cell for heat exchange. After the cooling liquid that has completed heat exchange converges at the liquid outlet area, it is discharged through the liquid outlet. In the whole process, the cooling liquid gradually exchanges heat with the battery cells of the battery module, and the special infiltration path of the cooling liquid increases the probability of contact between the cooling liquid and each battery cell, improves the uniformity and effect of heat exchange of all battery cells, and extends the service life of the battery cells.

Brief Description of Drawings

[0016] [Figure 1] It is a front schematic diagram of the separator of the embodiment of the present application. [Figure 2] It is a perspective schematic diagram of one perspective of the separator of the embodiment of the present application. [Figure 3] It is a perspective schematic diagram of another perspective of the separator of the embodiment of the present application. [Figure 4] It is an enlarged schematic diagram of the location A in FIG. 1. [Figure 5] It is an enlarged schematic diagram of the location B in FIG. 1. [Figure 6] It is a front schematic diagram of the tray of the embodiment of the present application. [Figure 7] It is a perspective view of one perspective of the tray of the embodiment of the present application. [Figure 8] It is a perspective view of another perspective of the tray of the embodiment of the present application. [[ID=3I]] [Figure 9] It is an enlarged schematic diagram of the location C in FIG. 6. [Figure 10]It is a perspective view from one angle where the tray and the case body of the embodiment of the present application have an integrated structure. [Figure 11] It is a perspective view from another angle where the tray and the case body of the embodiment of the present application have an integrated structure. [Figure 12] It is a top view of the battery case of the embodiment of the present application. [Figure 13] It is a perspective view from one angle of the battery case of the embodiment of the present application. [Figure 14] It is a perspective view from another angle of the battery case of the embodiment of the present application. [Figure 15] It is a top view of the battery case of the embodiment of the present application (the second closing plate is not shown). [Figure 16] It is a perspective view of the battery case of the embodiment of the present application (the second closing plate is not shown). [Figure 17] It is a top view of the battery pack of the embodiment of the present application (the second closing plate is not shown). [Figure 18] It is a perspective view of the battery pack of the embodiment of the present application (the second closing plate is not shown). [Figure 19] It is an exploded view of the battery pack of the embodiment of the present application. [Figure 20] It is a perspective view from one angle of the case body of the embodiment of the present application. [Figure 21] It is a perspective view from another angle of the case body of the embodiment of the present application. [Figure 22] It is a cross-sectional view of the battery pack of the embodiment of the present application (the direction of the arrow is the flow direction of the coolant). [Figure 23] It is a partial cross-sectional view of the separator of the embodiment of the present application. [Figure 24] It is a schematic cross-sectional view of the flow-dividing member of the embodiment of the present application.

Embodiments for Carrying Out the Invention

[0017] As shown in Figures 1-3 (see Figures 15-17, 19 and 22), an embodiment of the present invention provides a separator 2 applied to a battery case 100 of a battery pack, in which the first direction is the vertical direction (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 comprises a first body 201 and a first flow guide assembly 202, the first body 201 having a recirculation 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, which penetrate through the first direction, and a liquid outlet region 2013 is formed on the upper surface of the first body 201 along the first direction, configured to communicate with the liquid outlet 102 of the battery case 100, the coolant that has merged into the liquid outlet region 2013 is discharged to the outside of the battery case 100 by the liquid outlet 102, and the liquid outlet region 2013 and the recirculation hole 2011 The mounting holes 2012 are located near both ends of the first body 201 along the second direction, that is, at both ends in the longitudinal direction of the separator 2, and the first flow guide assembly 202 and the liquid outlet region 2013 are both located on the upper side of the first body 201, and the first flow guide assembly 202 comprises a plurality of first flow guide grooves 2021, with one end of each first flow guide groove 2021 communicating with the liquid outlet region 2013 and the other end communicating with the region where the battery module 200 is located, and the first flow guide assembly 202 is configured to introduce the coolant in the region where the battery module 200 is located into the liquid outlet region 2013.

[0019] In this embodiment, the separator 2 has a recirculation hole 2011 that penetrates the first body 201, allowing the coolant on one side of the first body 201 that is away from the outlet region 2013 (i.e., the lower side of the separator 2) to be drawn into the side of the first body 201 where the outlet region 2013 is located (i.e., the upper side of the separator 2) via the recirculation hole 2011. Furthermore, since the recirculation hole 2011 and the outlet region 2013 are located close to both ends of the first body 201 along the second direction, the coolant is drawn to the area where the recirculation hole 2011 is located. From the base, the battery cells 211 protruding from the first main body 201 are sequentially immersed, undergo heat exchange, and then merge into the outlet region 2013, where they can be discharged from the outlet port 102. This increases the heat exchange effect of the battery cells 211. Furthermore, because the first flow guide assembly 202 is provided between the outlet region 2013 and the battery module 200, all of the coolant that has completed heat exchange in the battery cells 211 can be merged into the outlet region 2013 as quickly as possible, accelerating the discharge of the high-temperature coolant after heat exchange and improving the cooling effect.

[0020] In one embodiment, the battery module 200 has a plurality of rows of battery cell groups 210 arranged along a third direction, each row of battery cell group 210 comprising a plurality of battery cells 211 arranged along a second direction, the third direction is provided at an angle to both the first and second directions, a flow guide gap 220 is formed between at least two adjacent rows of battery cell groups 210, and there is a one-to-one correspondence between a plurality of first flow guide grooves 2021 and a plurality of flow guide gaps 220. By creating a one-to-one correspondence between the flow guide gaps 220 between the battery cell groups 210 and the first flow guide groove 2021, after the coolant is drawn in by the return hole 2011, the coolant passes through multiple flow guide gaps 220 and is divided, increasing the opportunities for the coolant to come into contact with each battery cell 211 of each row of battery cell groups 210. Furthermore, after connecting the first flow guide groove 2021 and the flow guide gaps 220 in correspondence, the coolant that has exchanged heat with two adjacent rows of battery cell groups 210 mostly merges into the outlet region 2013 via the first flow guide groove 2021, and is then discharged to the outside of the battery case 100 as quickly as possible through the outlet port 102. This reduces the amount of coolant that has exchanged heat with two adjacent rows of battery cell groups 210 that recirculates or mixes with other rows of battery cell groups 210, and further prevents situations where the localized heat exchange efficiency of the battery cells 211 is low.

[0021] In one embodiment, both end faces of the first body 201 are spaced apart from the holes of the mounting holes 2012 along the third direction, thereby forming flow guide gaps 220 on both sides of the battery module 200 along the third direction. In one embodiment, since the mounting holes 2012 are spaced apart from both end faces of the first body 201 along the third direction, the battery cell 211 can form a gap with the end face of the first body 201 (i.e., separator 2) after it is mounted, and after the separator 2 is mounted inside the battery case 100, a gap can be formed between the battery cell 211 and the inner wall of the battery case 100. This gap is also a flow gap 220 through which the coolant passes, and the first flow groove 2021 is provided in accordance with the flow gap 220 at this position, thereby ensuring that the battery cells 211 on both sides along the third direction of the battery module 200 can also come into contact with the coolant at a lower temperature, and ensuring uniform heat dissipation of the battery cell 211 at this position.

[0022] In one embodiment, the first flow guide assembly 202 comprises 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 the first flow guide plates 2022 extend at one end to the liquid outlet region 2013 and at the other end to a region close to the battery module 200. The outwardly protruding first flow guide plates 2022 reduce the overall thickness of the first body 201, reduce the space occupied by the entire separator 2 in the battery case 100, improve the overall energy density of the battery pack, reduce the area of ​​the battery cell 211 obstructed by the first body 201, and further allow more of the battery cell 211 to be immersed in the coolant for heat dissipation.

[0023] In one embodiment, the first flow guide plate 2022 and the first body 201 are integrally injection-molded from plastic. This integral injection molding method reduces the difficulty of mounting and manufacturing the first flow guide plate 2022, reduces the number of parts, and lowers costs. Of course, the first flow guide plate 2022 may also be manufactured separately and then fixed to the first body 201 by methods such as bonding, welding, screw connection, or fastening.

[0024] In other embodiments, instead of providing a separate first flow guide plate 2022, the thickness of the first body 201 may be increased, and a groove may be made in the first body 201 to form the first flow guide groove 2021.

[0025] In one embodiment, as shown in Figure 4 (see Figures 1-3, 15-17, 19 and 22), the first flow guide plate 2022 has a width of L1 at one end adjacent to the liquid outlet region 2013 and a width of L2 at the other end adjacent to the battery cell 211, with L1 being smaller than L2. By widening the portion of the first flow guide plate 2022 closer to the battery cell 211, the amount of coolant in the flow guide gap 220 entering other regions can be reduced as much as possible. On the other hand, by narrowing the width of the portion of the first flow guide plate 2022 closer to the liquid outlet region 2013, a convergence effect is formed. Since the size of the liquid outlet 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 along the third direction), it is necessary to reduce the size of the first flow guide assembly 202.

[0026] The shape of the end face of the first flow guide plate 2022 that is close 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, forming a better flow guide effect and enabling 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 cell 211 is a cylindrical battery cell, and the end face of the first flow guide plate 2022 closest to the battery cell 211 is an arc-shaped surface. Of course, the battery cell 211 is not limited to a cylindrical shape; it 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 cell 211 can be adjusted according to the external shape of the battery cell 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, and also prevents the first flow guide plate 2022 from obstructing the battery cell 211, allowing the battery cell 211 to contact the coolant as much as possible for heat exchange.

[0029] In one embodiment, as shown in Figure 23 (see Figures 1 to 22), a confluence groove 2018 is recessed in the first body 201 where it is located in the liquid outlet region 2013, and all first flow guide grooves 2021 communicate with the confluence groove 2018. The recessed confluence groove 2018 improves the confluence effect, speeds up the confluence of the coolant in the first flow guide grooves 2021 into the confluence groove 2018, and reduces the probability that the coolant in the first flow guide grooves 2021 will recirculate into the flow guide gap 220 of the battery module 200.

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

[0031] In one embodiment, the two first flow guide plates 2022 located on the outermost side of the first flow guide assembly 202 along the third direction are first outer flow guide plates 20221, with the ends of the two first outer flow guide plates 20221 furthest from the battery cell 211 connected, and the remaining first flow guide plates 2022 are first inner flow guide plates 20222, with a gap between the end of the first inner flow guide plate 20222 closest to the first outer flow guide plate 20221 and the inner wall of the first outer flow guide plate 20221 to form a liquid outlet region 2013. By providing the liquid outlet region 2013 within the first flow guide assembly 202 and using the two first outer flow guide plates 20221 to block the liquid outlet region 2013, the coolant introduced by the first flow guide groove 2021 is effectively prevented from entering the outside of the liquid outlet region 2013.

[0032] Of course, the first external flow guide plate 20221 may be extended without connecting the two first external flow guide plates 20221, and after the separator 2 is attached to the case body 1 of the battery case 100, the end of the first external flow guide plate 20221 furthest from the battery cell 211 will be in close contact with the inner wall of the case body 1, which will also achieve a similar effect.

[0033] In one embodiment, the first body 201 has an immersion hole 2015 that penetrates through it in a first direction, the immersion hole 2015 is located between adjacent mounting holes 2012 and is provided in accordance with the gap between adjacent battery cells 211, and the size of the immersion hole 2015 is smaller than the size of the recirculation hole 2011. By providing the immersion holes 2015, some of the cooler liquid at a lower temperature can be introduced from the lower region of the first body 201 before the cooler liquid reaches the recirculation holes 2011, allowing it to exchange heat with the battery cells 211 in the upper region of the first body 201 and dissipate heat, thereby improving the cooling effect. The cooler liquid drawn in from the recirculation holes 2011 enters the flow guide gap 220 of the battery module 200 located above the first body 201, and then mixes with this portion of the cooler liquid that has passed through the immersion holes 2015, exchanging heat with the battery cells 211 and dissipating heat, so that the temperature of the cooler liquid in the upper region of the first body 201 is lower than the temperature of the cooler liquid in the lower region. As the temperature rises, the immersion holes 2015 have the effect of replenishing the coolant at a lower temperature so that the heat dissipation effect of the upper and lower parts of the battery cell 211 can be matched. Mixing this with the coolant drawn in from the recirculation holes 2011 lowers the temperature of the coolant in the upper region of the first body 201. By setting the size of the immersion holes 2015 to be smaller than the size of the recirculation holes 2011, the amount of coolant that passes through the immersion holes 2015 is reduced, avoiding affecting the amount of coolant in the recirculation holes 2011, and allowing the battery cell 211 in the vicinity of the recirculation holes 2011 to maintain normal heat exchange and heat dissipation effects.

[0034] In this embodiment, the sum of the areas of all immersion holes 2015 in the first body 201 is S1, the area of ​​the first body 201 is S2, and the ratio between S1 and S2 can satisfy 1:25000 to 3:50000. For example, the ratio between S1 and S2 may be 1:25000, 1:20000, 3:50000, etc. When the sum of the areas of the immersion holes 2015, S1, satisfies the above ratio, a reasonable amount of liquid immersion can be maintained, and a situation in which the amount of liquid immersion is too large and affects the flow rate of the coolant in the reflux hole 2011 can be avoided.

[0035] The area of ​​the single immersion hole 2015 is S3, and the area of ​​the single reflux hole 2011 is S4. The ratio between S3 and S4 can satisfy 2:25 to 1:8, for example, the ratio between S3 and S4 may be 2:25, 2:23, 2:20, 2:18, 2:17, or 1:8. The area of ​​the single immersion hole 2015 must be much smaller than the area of ​​the single reflux hole 2011. This is advantageous because most of the coolant flows through the reflux hole 2011 to the upper region of the first body 201, pushing the coolant to flow to the outlet region 2013, thereby reducing turbulence.

[0036] The sum of the areas of all immersion holes 2015 in the first body 201 is S1, and the sum of the areas of all reflux holes 2011 in the first body 201 is S5. The ratio between S1 and S5 can satisfy 1:2 to 2:3, for example, the ratio between S1 and S5 may be 1:2, 1:1.92, 1:1.85, 1:1.79, 1:1.72, 1:1.67, 1:1.61, 1:1.56, or 2:3. The immersion holes 2015 are configured to improve the uniformity of cooling throughout the battery cell 211 and reduce temperature differences by allowing the coolant to permeate and exchange heat with the battery cell 211. Furthermore, the total area of ​​the immersion holes 2015 must be smaller than the total area of ​​the recirculation holes 2011. This is advantageous because the coolant is recirculated by the recirculation holes 2011 to the upper region of the first body 201, pushing the coolant to flow into the outlet 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 the following: a semicircular hole, an elliptical hole, a rectangular hole, a polygonal hole, and an irregularly shaped hole. For example, the first body 201 may have both circular and semicircular immersion holes 2015.

[0038] In this embodiment, the reflux hole 2011 is a semicircular hole, and the arc-shaped hole wall 20111 of this reflux hole 2011 is located on the side where the battery cell 211 is located, with the planar hole wall 20112 facing it.

[0039] In one embodiment, the first body 201 is provided with a plurality of recirculation holes 2011 spaced apart along a third direction, the number of recirculation holes 2011 matching the number of flow guide gaps 220 of the battery module 200, and their positions are also arranged in a one-to-one correspondence, that is, one flow guide gap 220 corresponds to one recirculation hole 2011. With this design, when the recirculation holes 2011 draw the coolant from below the first body 201 to above the first body 201, they distribute it as uniformly as possible within the corresponding flow guide gaps 220, thereby improving the heat exchange and heat dissipation effect of the coolant on each battery cell 211.

[0040] The first body 201 is further provided with a sealing plate 205 located between the recirculation hole 2011 and the end face of one end of the first body 201 adjacent to the recirculation hole 2011 along the second direction, the length of the sealing plate 205 extending along the third direction, and the sealing plate 205 protruding from the side surface of the first body 201 on which the first flow guide assembly 202 is provided (i.e., the sealing plate 205 protrudes from the upper side surface of the first body 201). The recirculation hole 2011 is still at 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 space between the recirculation hole 2011 and the case body 1. If the blocking plate 205 is not provided, when the coolant enters the first body 201 from the recirculation hole 2011, there is a high possibility that some of the coolant will accumulate in this space and will not be able to smoothly enter the flow gap 220 of the battery module 200 for heat exchange. Therefore, by providing the blocking plate 205, it is possible to effectively prevent the coolant from accumulating in the space between the hole wall of the recirculation hole 2011 and the case body 1, and to enable all of the coolant that enters the first body 201 from below through the recirculation hole 2011 to the top of the first body 201 to enter the flow gap 220 of the battery module 200 for heat exchange. In one embodiment, both ends of the blocking plate 205 along the third direction are in close contact with the two inner walls of the case body 1 along the third direction. This design is intended to reduce the occurrence of stagnation when coolant enters the regions at both ends of the sealing plate 205 along the third direction.

[0041] In one embodiment, an inclined sealing plate flow guide surface 2051 is provided on one side of the sealing plate 205 near the recirculation hole 2011, and the sealing plate flow guide surface 2051 is inclined toward the side where the first flow guide assembly 202 is located, from one end closer to the first body 201 toward the other end, and toward the side where the first flow guide assembly 202 is located (that is, an inclined sealing plate flow guide surface 2051 is provided on one side of the sealing plate 205 near the recirculation hole 2011, and the sealing plate flow guide surface 2051 extends toward the side where the first body 201 is located toward the other end, and is inclined toward the side closer to the first flow guide assembly 202, in the first direction). The inclined blocking plate flow guide surface 2051 guides the coolant drawn out from the recirculation hole 2011 toward the side where the first flow guide assembly 202 and the battery module 200 are located, thereby accelerating the coolant's entry into the flow gap 220. In one embodiment, one side of the blocking plate flow guide surface 2051 closest to the first body 201 is flush with the planar hole wall 20112 of the recirculation hole 2011. This design ensures that all of the coolant drawn out from the recirculation hole 2011 can be guided by the blocking plate flow guide surface 2051, and reduces the resistance the coolant experiences from the blocking plate 205, resulting in a faster coolant flow.

[0042] Of course, the reflux holes 2011 are not limited to semicircular holes, but may be at least one of circular holes, elliptical holes, rectangular holes, polygonal holes, and irregularly shaped holes. For example, the first body 201 may have both semicircular reflux holes 2011 and circular reflux holes 2011. In addition, there may be only one reflux hole 2011, and if only one reflux hole 2011 is provided, the length of the reflux hole 2011 may be extended along the third direction so that the reflux hole 2011 can transport coolant for all of the guide gaps 220.

[0043] The sealing plate 205 and the first body 201 are manufactured and molded separately, with the lower surface of the sealing plate 205 in close contact with the upper surface of the first body 201. A gasket may be provided between the sealing plate 205 and the first body 201 to prevent the coolant from entering the position where the sealing plate 205 contacts the first body 201. In other embodiments, the sealing plate 205 and the first body 201 may be integrally injection molded, thereby reducing the difficulty of manufacturing.

[0044] Furthermore, the inside of the sealing plate 205 may be hollow, and this hollow structure can reduce the weight of the sealing plate 205 and further reduce the overall weight of the separator 2.

[0045] In one embodiment, the first body 201 is provided with a second flow guide assembly 203 adjacent to the recirculation hole 2011, and the second flow guide assembly 203 and the first flow guide assembly 202 are located on the same side surface of the first body 201, that is, the second flow guide assembly 203 is also located on the upper side surface of the first body 201, and the second flow guide assembly 203 is provided with a plurality of second flow guide grooves 2031, all of which connect the recirculation hole 2011 to the area where the battery module 200 is located. By providing a second flow guide assembly 203 that can guide the coolant drawn out from the reflux hole 2011 in a directional manner, it is possible to guide as much of the coolant from the reflux hole 2011 to the battery module 200 as possible to dissipate heat from the battery module 200. Furthermore, the installation of multiple second flow guide grooves 2031 is also to disperse the coolant and ensure that the battery cells 211 at each position of the battery module 200 can dissipate heat as uniformly as possible.

[0046] In this embodiment, there is a one-to-one correspondence between the multiple second flow guide grooves 2031 and the multiple flow guide gaps 220. By arranging the positions and number of the second flow guide grooves 2031 and flow guide gaps 220 accordingly, the coolant drawn in from the return hole 2011 can sequentially pass through the second flow guide grooves 2031, flow guide gaps 220, and first flow guide grooves 2021 to merge into the outlet region 2013. This minimizes the mixing of the coolant in the second flow guide assembly 203, thereby avoiding situations where the heat exchange efficiency in a localized area of ​​the battery cell 211 is low.

[0047] In one embodiment, each second flow guide groove 2031 communicates with a recirculation port 2011. This design ensures uniform flow distribution, balances the flow rate and temperature of the coolant within each flow guide gap 220, and further ensures uniform heat dissipation of the battery cells 211 within each row of battery cell groups 210. Of course, each second flow guide groove 2031 is not limited to communicating with only one recirculation port 2011; each second flow guide groove 2031 may communicate with two or more recirculation ports 2011. Each of the second flow guide grooves 2031 may be connected to the same number of recirculation holes 2011, or they may be connected to different numbers of recirculation holes 2011. If the heat generated by the central battery cells 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 recirculation holes 2011 corresponding to the central battery cells 211 can be increased, and the second flow guide grooves 2031 at this location can be connected to more recirculation holes 2011 to increase the flow rate of the coolant at this location.

[0048] In this embodiment, the second flow guide assembly 203 comprises a plurality of spaced-apart second flow guide plates 2032, with a second flow guide groove 2031 formed between two adjacent second flow guide plates 2032, and one end of the second flow guide plate 2032 extending to an area close to the battery cell 211. The outwardly protruding second flow guide plates 2032 reduce the overall thickness of the first body 201, reduce the space occupied by the separator 2 in the battery case 100, improve the overall energy density of the battery pack, reduce the area of ​​the battery cell 211 obstructed by the first body 201, and allow 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. This integral injection molding method reduces the difficulty of mounting and manufacturing the second flow guide plate 2032, reduces the number of parts, and lowers costs. Of course, the second flow guide plate 2032 may also be manufactured separately and fixed to the first body 201 by methods such as bonding, welding, screw connection, or fastening.

[0050] In other embodiments, instead of providing a separate second flow guide plate 2032, the thickness of the first body 201 may be increased, and a groove may be made in the first body 201 to form the second flow guide groove 2031.

[0051] In one embodiment, as shown in Figure 5 (see Figures 1-3, 15-17, 19 and 22), the second flow guide plate 2032 has a width of L3 at one end farther from the liquid outlet region 2013 and a width of L4 at the other end close to the liquid outlet region 2013, with L3 being smaller than L4. By widening the width of the portion of the second flow guide plate 2032 closer to the battery cell 211, the amount of coolant in the flow guide gap 220 entering other regions can be reduced as much as possible. On the other hand, by narrowing the width of the end of the second flow guide plate 2032 farther from the liquid outlet region 2013, the purpose is to avoid the opening position of the recirculation hole 2011 and to avoid obstructing the recirculation hole 2011.

[0052] The shape of the end face of the second flow guide plate 2032 adjacent to the liquid outlet region 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, forming a better flow guide effect and enabling the coolant in the second flow guide groove 2031 to enter the flow 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 curved. 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 will be adjusted according to the external shape of the battery cell 211.

[0054] Furthermore, there is a gap between the end face of the second flow guide plate 2032 that is close 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, and also prevents the second flow guide plate 2032 from obstructing the battery cell 211, allowing the battery cell 211 to come into contact with the coolant as much as possible for heat exchange.

[0055] In one embodiment, the first body 201 is provided with an inlet pipe 204 fixed to the outlet region 2013, and a via hole 2017 communicating with the inlet pipe 204 is provided in the outlet region 2013, with the via hole 2017 penetrating the first body 201. By providing the inlet pipe 204, it is made easier to draw the liquid from the inlet port 101 into the lower region of the first body 201, and mixing of the coolant inlet port 101 and the outlet region 2013 is avoided. After the separator 2 is attached to the case body 1, the coolant is first drawn into the region below the separator 2 to exchange heat and dissipate heat, and then the coolant passes through the recirculation hole 2011 and enters the region above the separator 2, and the battery cell 211 is immersed from a position close to the recirculation hole 2011 to a position close to the outlet region 2013 to exchange heat and dissipate heat.

[0056] Of course, the inlet pipe 204 is not limited to being fixed to the outlet region 2013; it may also penetrate the via hole 2017 directly and have a portion of it enter the lower region of the first main body 201. Alternatively, the inlet port 101 may be provided directly in the lower region of the first main body 201 without the inlet pipe 204, that is, the inlet port 101 may be directly connected to the lower region of the first main body 201.

[0057] Furthermore, the first main body 201, the first flow guide plate 2022, the second flow guide plate 2032, and the inlet pipe 204 are integrally injection-molded from plastic. The integral injection molding method has low manufacturing costs, fewer parts, and is easy to install. Each component of the first main body 201, for example, the first flow guide plate 2022, the second flow guide plate 2032, and the inlet pipe 204, may be manufactured separately and then fixed to the first main body 201 by welding, bonding, screw connection, or locking.

[0058] In one embodiment, both end faces of the first body 201 along the third direction are provided with a first groove group, and each group of first grooves comprises a plurality of first grooves 2016 spaced apart along the second direction, with the first grooves 2016 recessed toward the area between two adjacent mounting holes 2012. By providing the first grooves 2016, the space at both ends of the first body 201 along the third direction can be reduced. This is because, if the size of the battery cells 211 is the same, the width of the flow guide gap 220 between adjacent battery cell groups 210 will match. If these first grooves 2016 are not provided in the flow guide gaps 220 located on both sides of the battery module 200 along the third direction, flow guide gaps 220 with matching widths will be formed, and in this way the cooling effect of the battery cells 211 on both sides of the battery module 200 will not match the cooling effect of the intermediate battery cell 211. In one embodiment, the first groove 2016 is an arc-shaped groove, and two adjacent first grooves 2016 are connected by an arc-shaped first protrusion 2014, thereby causing the end face of the first body 201 along the third direction to form a corrugated surface.

[0059] Referring to Figures 12-16 (some reference numerals are reused from Figures 1-3 and 17-22), the embodiment of the present application further provides a battery case 100, which comprises a case body 1 having a housing chamber inside, and the battery case 100 further comprises a separator 2 according to the embodiment of the present application, the separator 2 is provided inside the case body 1 and divides the housing chamber into upper and lower independent first chambers 103 and second chambers 104, the first flow guide assembly 202, the second flow guide assembly 203 and the sealing plate 205 in the separator 2 are all located inside the first chamber 103, the liquid inlet 101 communicates with the second chamber 104, and the battery cell 211 is fixed inside the mounting hole 2012 of the first body 201, with one end being One end enters the first chamber 103, and the other end enters the second chamber 104. The inlet 101 sends the coolant into the second chamber 104. The coolant flows from one end of the second chamber 104, where the first flow guide assembly 202 is located near the separator 2, to the other end where the recirculation hole 2011 is located, immersing the battery cell 211 for heat exchange and heat dissipation. Then, through the recirculation hole 2011, it enters the first chamber 103. The coolant is then divided into the second flow guide grooves 2031 of each second flow guide assembly 203 by the guiding action of the sealing plate flow guide surface 2051 of the sealing plate 205. After passing through the flow guide gap 220 and the first flow guide groove 2021 of the battery module 200, it merges in the outlet region 2013 and is finally discharged through the outlet 102.

[0060] In this battery case 100, a first chamber 103 and a second chamber 104 are formed by the partition of the separator 2. Through the combined action of the first flow guide assembly 202, the second flow guide assembly 203, the sealing plate 205, and the recirculation holes 2011 in the separator 2, heat exchange is effectively performed with respect to the battery cells 211, dissipating heat and preventing phenomena such as deterioration over time caused by uneven heat dissipation in localized battery cells 211, thereby extending the service life of the entire battery module 200.

[0061] Furthermore, when the battery cell 211 is installed in the mounting hole 2012, it is fixed and sealed with sealant, preventing the battery cell 211 from shifting position in the separator 2. In addition, it 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 hole wall of the mounting hole 2012 and entering the lower region of the separator 2 (i.e., the second chamber 104), thereby effectively preventing the coolant from mixing.

[0062] In other embodiments, the first direction is not limited to being vertical, but may also be horizontal. That is, when the battery case 100 is placed vertically, the first direction is horizontal. Furthermore, the second direction is not limited to being the length direction of the battery case 100 and the third direction to being the width direction of the battery case 100. The second direction may also be the width direction of the battery case 100 and the third direction may be the length direction of the battery case 100. The specific directional limitations will not be explained repeatedly.

[0063] Referring to Figures 17-22, the embodiment of the present invention further provides a battery pack comprising a battery case 100 having a housing chamber inside, and a battery module 200 provided inside the housing 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 invention provides a tray 3 applied to a battery case 100, in which 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 comprises a second body 301, a third flow guide assembly 302, and a flow guide plate 303. The second body 301 is provided with an inlet area 3011, which is configured to communicate with the inlet port 101 of the battery case 100 and is located on the upper side of the second body 301 along the first direction. The third flow guide assembly 302 is also located on the upper side of the second body 301 along the first direction and comprises a plurality of third flow guide grooves 3021, one of which The third flow guide assembly 302 is configured such that one end communicates with the input fluid region 3011 and the other end communicates with the region where the battery module 200 is located, and the third flow guide assembly 302 disperses the coolant in the input fluid region 3011 and guides 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 close 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 that is close to the third flow guide assembly 302.

[0066] In this embodiment, tray 3 is provided with an inlet region 3011 configured to receive coolant from the inlet port 101 of the battery case 100, and a third flow guide assembly 302 that disperses the coolant in the inlet region 3011 before guiding it to the battery module 200. This enables the battery module 200 to be more uniformly immersed in the coolant and dissipate heat through heat exchange, thereby improving the heat dissipation effect of the battery module 200. Furthermore, by providing a flow guide plate 303 that can guide the coolant after heat exchange with the battery module 200 to another region for heat exchange, or to the outside of the battery case 100, heat exchange in other regions is ensured to proceed smoothly, and the probability of the coolant flowing back to the battery module 200, which has already completed heat exchange, is reduced.

[0067] In this embodiment, the flow guide surface 3031 is an inwardly curved surface that curves toward the side furthest from the third flow guide assembly 302. By making the flow guide surface 3031 an inwardly curved surface, the resistance of the coolant on the flow guide surface 3031 is reduced, ensuring that the coolant can be quickly guided to other areas 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 curved surface, but may also be a sloped surface. In one embodiment, the flow guide surface 3031 is inclined toward the side furthest from the second body 301 from one end closer to the second body 301, and toward the side furthest from the third flow guide assembly 302. That is, the flow guide surface 3031 is inclined from bottom to top toward the side furthest from the third flow guide assembly 302. A sloped flow guide surface 3031 can also reduce the resistance of the coolant.

[0068] In one embodiment, the battery module 200 has a plurality of rows of battery cell groups 210 arranged along a third direction, each row of battery cell group 210 comprises a plurality of battery cells 211 arranged along a second direction, and a flow guide gap 220 is formed between at least two adjacent rows of battery cell groups 210, with a one-to-one correspondence between a plurality of third flow guide grooves 3021 and a plurality of flow guide gaps 220. By creating a one-to-one correspondence between the flow guide gap 220 and the third flow guide groove 3021 between the battery cell groups 210, the coolant that has been cooled externally can be diverted by the third flow guide groove 3021 upon entering the input liquid region 3011. The flow guide gap 220, which corresponds to and communicates with the third flow guide groove 3021, can receive the diverted coolant. This increases the opportunities for each battery cell 211 in each row of battery cell groups 210 to come into contact with the coolant, resulting in a more uniform cooling temperature. The coolant after heat exchange is guided to other regions by the flow guide surface 3031 to exchange heat, or guided to the outside of the battery case 100. This reduces the amount of coolant that has exchanged heat with two adjacent rows of battery cell groups 210 and then flows back or mixes with other rows of battery cell groups 210, thus preventing situations where the localized heat exchange efficiency of the battery cells 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 contact the inner wall of the battery case 100. This is to avoid a situation where the coolant cannot penetrate to a localized area of ​​the battery cell 211, resulting in poor heat dissipation. The third flow guide groove 3021 also corresponds to the flow guide gaps 220 formed on both sides of the battery module 200 along the third direction. The coolant that has entered the liquid inlet area 3011 can also enter the flow guide gaps 220 on both sides of the battery module 200 along the third direction via the third flow guide groove 3021 at this position, ensuring that the coolant penetrates to each battery cell 211, allowing for heat exchange and heat dissipation, and further ensuring uniform heat exchange for all battery cells 211.

[0070] In one embodiment, the third flow guide assembly 302 comprises a plurality of spaced-apart third flow guide plates 3022, with a third flow guide groove 3021 formed between two adjacent third flow guide plates 3022. Each third flow guide plate 3022 extends at one end to the electrolyte input area 3011 and at the other end to an area close to the battery module 200. The outwardly protruding third flow guide plates 3022 reduce 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 overall energy density of the battery pack.

[0071] In one embodiment, the third flow guide plate 3022 and the second body 301 are integrally injection-molded from plastic. This integral injection molding method reduces the difficulty of mounting and manufacturing the third flow guide plate 3022, reduces the number of parts, and lowers costs. Of course, the third flow guide plate 3022 may also be manufactured separately and fixed to the second body 301 by methods such as bonding, welding, screw connection, or fastening.

[0072] In other embodiments, instead of providing a separate third flow guide plate 3022, the thickness of the second body 301 may be increased and a groove may be made in the second body 301 to form the third flow guide groove 3021. This design requires that at least a portion of the battery cell 211 be fitted inside the second body 301; otherwise, the dispersion and guidance of the coolant by the third flow guide groove 3021 cannot be achieved effectively.

[0073] In one embodiment, as shown in Figure 9 (see Figures 6-8, 15-17, 19 and 22), the third flow guide plate 3022 has a width of L5 at one end adjacent to the fluid inlet area 3011 and a width of L6 at the other end adjacent to the battery cell 211, with L5 being smaller than L6. By widening the portion of the third flow guide plate 3022 closer to the battery cell 211, the amount of coolant in the flow guide gap 220 entering other areas can be reduced as much as possible. On the other hand, the width of the portion of the third flow guide plate 3022 closer to the fluid inlet area 3011 is reduced to form a convergence effect. Since the size of the fluid inlet area 3011 is generally designed to be smaller than the width of the battery module 200 (i.e., the size of the battery module 200 along the third direction), it is necessary to reduce the size of the third flow guide assembly 302 so that the coolant can be smoothly introduced from the fluid inlet area 3011 into all of the third flow guide grooves 3021.

[0074] The shape of the end face of the third flow guide plate 3022 that is close 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, forming a better flow guide effect and enabling the coolant in the third flow guide groove 3021 to enter the flow gap 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 that is close to the battery cell 211 is an arc-shaped surface. Of course, the battery cell 211 is not limited to a cylindrical shape, but may be rectangular, polygonal, or irregularly shaped, in which case the shape of the end face of the third flow guide plate 3022 that is close to the battery cell 211 should be adjusted according to the outer shape of the battery cell 211.

[0075] Furthermore, 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, and also prevents the third flow guide plate 3022 from obstructing the battery cell 211, allowing the battery cell 211 to contact the coolant as much as possible for heat exchange.

[0076] In one embodiment, the second body 301 is provided with a flow divider 304 protruding from the inlet region 3011. By providing the flow divider 304, the coolant transported from the inlet port 101 is divided, preventing a localized portion of the coolant from being accelerated and rushing into a single third flow guide groove 3021. The flow divider 304 first divides the coolant once, and the divided coolant can then be transported uniformly to each third flow guide groove 3021. This ensures that each flow guide gap 220 can obtain coolant with nearly identical flow rates at the same temperature, guaranteeing that the cooling effect on each battery cell 211 is the same, reducing temperature differences among the battery cells 211, and extending the overall service life of the battery module 200.

[0077] In this embodiment, at least a portion of the outer wall of the flow divider 304 is curved, and the size of the cross-section at one end of the flow divider 304 furthest from the second body 301 is smaller than the size of the cross-section at the end connected to the second body 301. By providing a curved surface on the outer wall of the flow divider 304, the scattering of the coolant transported from the inlet 101 across the flow divider 304 is reduced, and it is possible to ensure that the coolant can be divided according to the outer wall of the flow divider 304. Furthermore, the structure with a small upper end and a large lower end creates a good flow division effect, and the lower end of the flow divider 304 has a dispersed structure, ensuring that the coolant can be divided uniformly.

[0078] In one embodiment, as shown in Figure 24 (see Figures 1 to 22), the two outermost third guide plates 3022 located along the third direction are third outer guide plates 30221, and the ends of the two third outer guide plates 30221 furthest from the battery cells 211 are connected, and the remaining third guide plate 3022 is a third inner guide plate 30222, and the end of the third inner guide plate 30222 furthest from the battery cells 211 and the inner wall of the third outer guide plate 30221 are spaced apart to form an inlet region 3011, and the flow divider 304 comprises a flow divider outer surface 3042, a flow divider bottom surface 3043, and a flow divider top surface 3041, and the flow divider top surface 3041 and the diversion bottom surface 3043 are spaced apart along the first direction, the diversion outer periphery surface 3042 connects the diversion top surface 3041 and the diversion bottom surface 3043, the diversion bottom surface 3043 is connected to the second body 301, the size of the diversion top surface 3041 is smaller than the size of the diversion bottom surface 3043, the diversion outer periphery surface 3042 includes a connecting surface 30421 and a diversion guide surface 30422 that are connected to each other along the periphery of the diversion member 304, the connecting surface 30421 is connected to the inner surface of the third outer guide plate 30221, and the diversion guide surface 30422 is a tapered surface and faces the third inner guide plate 30222. The structural form of the diversion member 304 is practically a half-structure in which a cone is cut in half along its central axis. By structuring the flow-dividing outer surface 3042 of the flow-dividing material 3044 so that it is connected to the connecting surface 30421 and the flow-dividing guide surface 30422, the connecting surface 30421 can be connected to the third outer guide plate 30221 (the connecting surface 30421 is not exposed after connection), the tapered flow-dividing guide surface 30422 is exposed from the flow-dividing material 304, the tapered surface structure is used to divide the coolant from top to bottom, the tapered surface structure reduces the resistance and scattering of the coolant as much as possible, and ensures that the coolant gradually disperses along the tapered surface structure from the smaller flow-dividing top surface 3041 to the larger flow-dividing bottom surface 3043, and when the dispersed coolant enters the third guide groove 3021, the coolant is distributed relatively uniformly within each of the third guide grooves 3021.

[0079] In one embodiment, the second main body 301 has a plurality of mounting grooves 3012 into which the battery cells 211 are attached. By providing the mounting grooves 3012, the lower end of the battery cell 211 can be easily fixed to the tray 3, the difficulty of fixing the battery cell 211 is reduced, and displacement of the battery cell 211 can be avoided. In one embodiment, the battery cell 211 is adhered to the mounting grooves 3012 with sealant.

[0080] A first pressure relief hole 3013 is provided at the bottom of the mounting groove 3012, penetrating the second main body 301. By providing the first pressure relief hole 3013 at the bottom of the mounting groove 3012, if a battery cell 211 fails, the pressure from the battery cell 211 is released through the first pressure relief hole 3013, and any substances such as electrolyte that are ejected are discharged to the bottom of the tray 3, that is, to one side of the tray 3 that is far from the coolant, thereby preventing contamination of the coolant by substances such as electrolyte, and also preventing the failed battery cell 211 from affecting the remaining adjacent battery cells 211. In this embodiment, since the battery cell 211 is adhered to the mounting groove 3012 by sealant, the adhesion position of the sealant further plays a sealing role, 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, a second groove group is provided on both end faces of the second body 301 along the third direction, and each second groove group comprises a plurality of second grooves 3014 spaced apart along the second direction, with the second grooves 3014 recessed toward the area between two adjacent mounting grooves 3012. By providing the second grooves 3014, the space at both ends of the second body 301 along the third direction can be reduced. This is because, if the size of the battery cells 211 is the same, the width of the flow guide gap 220 between adjacent battery cell groups 210 will match. If these second grooves 3014 are not provided in the flow guide gaps 220 located on both sides of the battery module 200 along the third direction, flow guide gaps 220 with mismatched widths will be formed, and in this way the cooling effect of the battery cells 211 on both sides of the battery module 200 will not match the cooling effect of the intermediate battery cells 211. In one embodiment, the second groove 3014 is an arc-shaped groove, and two adjacent second grooves 3014 are connected by an arc-shaped second protrusion 3016, thereby causing the end face of the second body 301 along the third direction to form a corrugated surface.

[0082] In one embodiment, a connecting projection 305 protrudes in an annular shape around the periphery of the second body 301, and the connecting projection 305 and the third flow guide assembly 302 are located on the same side surface of the second body 301, that is, the connecting projection 305 protrudes from the upper side surface of the second body 301, and the connecting projection 305 has a recessed engaging groove 3051 configured to engage with the case body 1 of the battery case 100. By providing the connecting projection 305 and the engaging groove 3051, the tray 3 and the case body 1 can be manufactured separately and then assembled to connect them, thereby reducing the difficulty of manufacturing. Specifically, during assembly, sealant is placed in the engaging groove 3051, and the lower end of the case body 1 can be inserted into the engaging groove 3051 to achieve adhesion and fixation with the sealant. After adhesion, the space between the case body 1 and the tray 3 is also sealed with sealant, preventing leakage of coolant.

[0083] In other embodiments, the connection projection 305 and the engagement groove 3051 are not limited to being connected to the case body 1. As shown in Figures 10 and 11, the tray 3 may be directly welded to the case body 1, or the tray 3 and the case body 1 may be formed integrally by injection molding or integral casting.

[0084] Referring to Figures 12-16 (some reference numerals are reused from Figures 6-8 and 17-22), the embodiment of the present application further provides a battery case 100, which comprises a case body 1 having a storage chamber inside, and the battery case 100 further comprises a tray 3 according to the embodiment of the present application, with an opening 1014 provided at the lower end of the case body 1, the tray 3 closing this opening 1014, and the liquid inlet area 3011, third flow guide assembly 302, flow guide plate 303, and flow divider 304 in the tray 3 all being provided within the storage chamber, and the case body 1 further comprises a liquid inlet 101 and a liquid outlet 102, both communicating with the storage chamber, of which the liquid inlet 101 is provided facing the flow divider 304 of the tray 3. The coolant enters the case body 1 of the battery case 100 from the inlet 101, then passes through the flow divider 304 to divide once, and then passes through multiple third flow guide grooves 3021 to divide again. The coolant that enters the third flow guide grooves 3021 enters the flow guide gap 220 of the battery module 200, then merges with the flow guide plate 303, and finally is guided to other areas of the case body 1 by the flow guide surface 3031, or discharged directly through the outlet 102.

[0085] This battery case 100 effectively exchanges and dissipates heat to each battery cell 211 of the battery module 200 through the diversion, guidance, and induction of the tray 3, thereby preventing phenomena such as deterioration over time caused by uneven heat dissipation in localized battery cells 211, and extending the overall service life of the battery module 200.

[0086] In other embodiments, the first direction is not limited to being vertical, but may also be horizontal. That is, when the battery case 100 is placed vertically, the first direction is horizontal. Furthermore, the second direction is not limited to being the length direction of the battery case 100 and the third direction to being the width direction of the battery case 100. The second direction may also be the width direction of the battery case 100 and the third direction may be the length direction of the battery case 100. The specific directional limitations will not be explained repeatedly.

[0087] Referring to Figures 17-22, the embodiment of the present invention further provides a battery pack comprising a battery case 100 having a housing chamber inside, and a battery module 200 provided inside the housing chamber. The specific structure of the battery case 100 will not be described repeatedly.

[0088] As shown in Figures 12-16 (see Figures 1-3, 6-8, and 17-22), an embodiment of the present invention provides a battery case 100 in which 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 explanation will exemplify the case where the battery cell 211 of the battery module 200 installed inside the battery case 100 is a cylindrical battery cell 211. The battery cell 211 is not limited to a cylindrical battery cell 211; it may be rectangular, polygonal, or irregularly shaped, and the specific structure of the battery cell 211 is not limited. Some parts of the structure of the battery case 100 are adaptively adjusted according to the shape of the battery cell 211 and will not be explained repeatedly here.

[0090] In this embodiment, the battery case 100 comprises a case body 1 and a separator 2. The case body 1 has an inlet 101 and an outlet 102 spaced apart, and a storage chamber configured to house the battery module 200 is provided inside the case body 1. The separator 2 is provided inside the storage chamber and divides the storage chamber into a first chamber 103 and a second chamber 104 distributed along a first direction, with the first chamber 103 located above the second chamber 104. The separator 2 has a plurality of mounting holes 2012 configured to accommodate the battery cells 211 of the battery module 200. Both ends of 1 extend into the first chamber 103 and the second chamber 104, respectively. Separator 2 has a reflux hole 2011, and separator 2 has a liquid outlet region 2013 that communicates with a liquid outlet 102. The liquid outlet region 2013 is located inside the first chamber 103, and the liquid outlet region 2013 and the reflux hole 2011 are close to both ends of separator 2 along the second direction. The liquid outlet 102 communicates with the liquid outlet region 2013. Inside the second chamber 104 is an inlet region 3011, and the inlet region 3011 and the liquid outlet region 2013 are located at the same end of case body 1 along the second direction. The inlet 101 communicates with the inlet region 3011, and the first and second directions are arranged at a narrow angle.

[0091] In the embodiment of the present invention, the battery case 100 divides the housing chamber within the case body 1 into two independent chambers, a first chamber 103 and a second chamber 104, using a separator 2. After the battery cell 211 is attached to the separator 2, the two chambers are sealed relative to each other. Cooling liquid enters first into the inlet area 3011 of the second chamber 104 from the inlet port 101, and then sequentially immerses the portion of the battery cell 211 located in the second chamber 104 along the second direction, from one end closer to the inlet area 3011 to the other end further away from the inlet area 3011, thereby exchanging heat with the battery cell 211 and dissipating heat. The cooling liquid then enters the first chamber 103 through the reflux holes 2011 in the separator 2. The portion of the battery cell 211 located in the first chamber 103 is sequentially immersed in the cooling liquid from the side where the reflux hole 2011 is located toward the outlet region 2013, exchanging heat with the remaining portion of the battery cell 211 and converting heat. The cooled liquid, after heat exchange is complete, merges with the outlet region 2013 and is then discharged through the outlet port 102. Throughout the entire process, the cooled liquid gradually converts heat from the battery cells 211 of the battery module 200. The special infiltration path of the cooled liquid (an infiltration path similar to a U shape, i.e., the path indicated by the arrow in Figure 22) increases the probability that each battery cell 211 comes into contact with the cooled liquid, 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 a third direction, with each row of battery cell group 210 comprising multiple battery cells 211 arranged along a second direction, and two adjacent rows of battery cell groups 210 arranged alternately. This design makes the arrangement of the battery module 200 more compact, ensuring a higher utilization rate of space within the battery case 100 and a higher energy density of the battery pack formed after the battery module 200 is assembled.

[0093] The battery case 100 may be provided only with a separator 2, and the specific structure of the separator 2 is as described in the embodiment of this application, so the specific structure of the separator 2 will not be repeatedly explained 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 there is a gap between the tray 3 and the separator 2, with a second chamber 104 formed between them. 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 embodiment of this application, and the specific structure of the tray 3 is as described in the embodiment of this application. The specific structures of the separator 2 and the tray 3 will not be described again here.

[0095] The following explanation will use the example where both the separator 2 and the tray 3 are provided in the battery case 100.

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

[0097] In this embodiment, the height of the second chamber 104 along the first direction is H1, the liquid level height of the coolant in the containment chamber along the first direction is H2, and the size of the battery cell 211 along the first direction is H3. The relationship ratio of H1, H2, and H3 can satisfy 2:5:5 or 1:4:4. This relationship ratio design is advantageous because the height of the second chamber 104 is lower than the height of the first chamber 103, which increases the flow velocity of the coolant in the second chamber 104 and further speeds up 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; the heights of the second chamber 104 and the first chamber 103 may be made the same, that is, the separator 2 is located in the middle of the case body 1 along the first direction, thereby making the heights of the first chamber 103 and the second chamber 104 the same.

[0098] The inlet 101 and outlet 102 are located on the same side of the case body 1 along the first direction, close to the first chamber 103, and both are close to one end where the outlet region 2013 is located. By providing the inlet 101 and outlet 102 on the same side of the case body 1 along the first direction, i.e., on the upper or lower side of the battery case 100, it is possible to avoid the inlet 101 and outlet 102 occupying horizontal space in the battery case 100, making the arrangement of the battery cases 100 more compact and increasing the space utilization rate. Furthermore, by providing both the inlet 101 and outlet 102 at one end close to the outlet region 2013, the length of the piping inside the battery case 100 can be shortened, costs can be saved, and the space occupancy rate inside the battery case 100 can be reduced. In one embodiment, the inlet 101 and outlet 102 are located on the upper side of the battery case 100. This design allows the coolant to flow down along the flow path as it enters, reaching the second chamber 104 located below, and after the coolant in the second chamber 104 has filled the entire chamber, it can then enter the first chamber 103 through the reflux holes 2011.

[0099] In other embodiments, the electrolyte inlet 101 and the electrolyte outlet 102 are not limited to being provided on the same side of the case body 1, but may be provided on different sides. For example, the electrolyte inlet 101 may be provided on the lower side of the battery case 100 and the electrolyte outlet 102 on the upper side of the battery case 100, or the electrolyte inlet 101 and the electrolyte outlet 102 may be 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 comprises a first closing plate 4 and a second closing plate 5, and openings 1014 are provided at both ends of the case body 1 along the first direction, the lower end of the case body 1 along the first direction being closed by a tray 3, a pressure relief groove 3015 is recessed on one side of the tray 3 furthest from the separator 2, the tray has a plurality of mounting grooves into which the battery cells are attached, and a first pressure relief hole is provided at the bottom of the mounting groove A 3013 is provided (i.e., a first pressure relief hole 3013 is provided in the tray 3 corresponding to each battery cell 211), the first pressure relief hole 3013 is in communication with this pressure relief groove 3015, and a first closing plate 4 is connected to the side of the tray furthest from the separator to close the groove opening of this pressure relief groove 3015, and the opening 1014 at the upper end of the case body 1 along the first direction is closed by the second closing plate 5, thereby forming a sealed battery case 100. By providing the pressure relief groove 3015, communication with the first pressure relief hole 3013 of the tray 3 is made possible. The first pressure relief hole 3013 corresponds to the position of the battery cell 211. If the battery cell 211 malfunctions and pressure needs to be released, substances such as electrolyte ejected from inside the battery cell 211 can enter the pressure relief groove 3015 through the first pressure relief hole 3013. The installation of 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 ejected from the battery cell 211, and also prevents adjacent battery cases 100 from influencing each other and avoids environmental pollution. By providing the opening 1014 and the second closing plate 5, the installation of components such as the separator 2 and battery module 200 becomes easier, and later maintenance of components inside the battery case 100 also becomes easier.

[0101] In one embodiment, a plurality of support columns 306 are provided protruding from the bottom of the pressure relief groove 3015. The support columns 306 are located between adjacent first pressure relief holes 3013, and one end furthest from the bottom of the pressure relief groove 3015 is in close contact with the inside of the first closing plate 4. By providing the support columns 306, the first closing plate 4 can be supported using the support columns 306, and deformation of the first closing plate 4 can be avoided.

[0102] The case body 1 has an opening 1014 at its upper end along a first direction that communicates with the storage chamber. At its end, a mounting portion 1010 is formed extending into the middle of the opening 1014, and the opening 1014 is closed by connecting the second closing plate 5 to the mounting portion 1010. By providing the mounting portion 1010, a position can be formed on the upper surface of the case body 1 that is easily accessible for mounting the second closing plate 5. In one embodiment, a sealing groove 1011 is formed in an annular shape around the periphery of the opening 1014 in the mounting portion 1010, and sealant is provided in the sealing groove 1011. The second closing plate 5 is connected to the mounting portion 1010 by the sealant. In one embodiment, a ring-shaped step 1012 is provided on the inner wall of the mounting portion 1010, with a gap between the step 1012 and the side of the mounting portion 1010 furthest from the housing chamber (i.e., the step 1012 is recessed inward, and there is a gap between the upper side of the step 1012 and the upper side of the mounting portion 1010), the second closing plate 5 is in contact with the step 1012, and the sealing groove 1011 is provided in the step 1012. By providing the step 1012, the position of the second closing plate 5 can be restricted with respect to its mounting position, ensuring that the second closing plate 5 can accurately seal the opening 1014, and also effectively preventing displacement of the second closing plate 5. In addition to fixing the second closing plate 5 by adhesive fastening, the second closing plate 5 may also be fixed by a combination of screws and a sealing ring, or by a combination of a locking structure and a sealing ring. The detachable connection method facilitates the attachment and detachment of the second blocking plate 5, thereby facilitating the installation and maintenance of the battery module 200 inside the battery case 100.

[0103] In this embodiment, the inlet 101 and outlet 102 are provided on the mounting portion 1010, and an inlet fitting 6 is provided on the mounting portion 1010 corresponding to the inlet 101, and an outlet fitting 7 is provided on the mounting portion 1010 corresponding to the outlet 102. By connecting to an external duct using the inlet fitting 6 and outlet fitting 7, circulating cooling of the coolant is achieved. Furthermore, by providing both the inlet 101 and outlet 102 on the mounting portion 1010, obstruction and pulling on the duct when attaching or detaching the second closing plate 5 can be avoided. To enable quick attachment and detachment of the duct, the inlet fitting 6 and outlet fitting 7 can be of the type of quick-attachment fitting. In other embodiments, both the inlet 101 and outlet 102 may be provided on the second closing plate 5, or both the inlet 101 and outlet 102 may be provided on the mounting portion 1010 and the second closing plate 5, respectively.

[0104] Furthermore, the inlet port 101 is connected to the second chamber 104 by an inlet pipe 204, which is located inside the first chamber 103. A via hole 2017 is provided in the separator 2, which communicates with the inlet pipe 204 and penetrates the separator 2. To facilitate maintenance and avoid leakage, the supply pipe 204 may be directly fixed to the separator 2. In other embodiments, the inlet pipe 204 may be provided independently, and after the separator 2 is installed, both ends of the inlet pipe 204 are in close contact with the mounting portion 1010 and the separator 2, respectively. Alternatively, the inlet pipe 204 may directly penetrate the via hole 2017, so that a portion of the inlet pipe 204 is located inside the first chamber 103 and tightly abuts against the position corresponding to the inlet port 101 of the mounting portion 1010, and the other portion extends into the second chamber 104. In this case, it is necessary to seal the outer wall of the 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 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 a third direction, and both the inner surfaces of the first side plate 105 and the second side plate 106 are 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 wall of the battery cell 211 on the outside of the battery module 200 along the third direction, and there is a gap between the outer wall of the battery cell 211 and the groove wall of the third groove 107, with two adjacent third grooves A protruding structure 108 is formed between the grooves 107, and the protruding structure 108 is inserted in the region 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. Since the two end faces of the separator 2 along the third direction are tightly in contact with the inner walls of the first side plate 105 and the second side plate 106, respectively, and are sealed, 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 at the connection position between the separator 2 and the first side plate 105 and second side plate 106 of the case body 1, a first protrusion 2014 is provided on the end face 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. The outer wall of the first protrusion 2014 is in close contact with the groove wall of the third groove 107, and the outer wall of the protrusion structure 108 is in close contact with the groove wall of the first groove 2016, forming a structure that is tightly in contact with each other.

[0106] The first side plate 105 and the second side plate 106 are corrugated sheets, and corresponding to the convex structure 108, a groove structure 109 is formed on the outer surface of the first side plate 105 and the second side plate 106, so that the two end faces of the separator 2 along the third direction form a corrugated surface. By making the first side plate 105 and the second side plate 106 corrugated sheets, space in the third direction of the battery case 100 can be saved.

[0107] To facilitate the assembly of the battery cells 211, mounting grooves 3012 can be provided in the tray 3, except by utilizing the limitations of the separator 2. The number and arrangement of the mounting grooves 3012 are determined according to the number and arrangement of the battery cells 211 of the battery module 200. The lower end of the battery cell 211 is inserted into these mounting grooves 3012. A first pressure relief hole 3013 is provided at the bottom of the mounting groove 3012 and penetrates the second body 301 of the tray 3 along a first direction (i.e., penetrates the thickness direction of the second body 301). After the battery cells 211 are assembled in the tray 3, sealant is provided between the groove walls of the mounting grooves 3012 and the outer wall of the battery cell 211 to prevent coolant from leaking from between the outer wall of the battery cell 211 and the groove walls of the mounting grooves 3012 to the side far from the second chamber 104 of the tray 3 (i.e., to prevent coolant from leaking to the bottom outside 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 released when the battery cell 211 in the pressure relief groove 3015 malfunctions and releases pressure can be discharged to the outside of the case body 1. In one embodiment, the second pressure relief hole 1013 is provided on one of the sides of the case body 1 along the second direction. In other embodiments, the second pressure relief hole 1013 is not limited to being provided on the side of the case body 1 along the second direction, but may also be provided on the side of the case body 1 along the third direction (i.e., the first side plate 105 and / or the second side plate 106).

[0109] In one embodiment, the projection of the reflux hole 2011 in the separator 2 along the first direction overlaps at least a portion with the flow guide surface 3031 of the flow guide plate 303 of the tray 3. This design allows the coolant guided upward by the flow guide surface 3031 to pass through the reflux hole 2011 as quickly as possible into the first chamber 103, reducing the time the coolant remains in the second chamber 104 and accelerating the circulation of the coolant. In another embodiment, the projection of the reflux hole 2011 along the first direction overlaps entirely 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 point between the tray 3 and the case body 1. In one embodiment, the tray 3 and the case body 1 are molded by an integral manufacturing method, which is easy to operate, has no joint gaps, and has a good leak prevention effect. In one embodiment, the tray 3 and the case body 1 are integrally injection molded.

[0111] Of course, the tray 3 and the case body 1 are not limited to being fixedly connected; they may also be detachably connected. In one embodiment, the tray 3 is provided with a locking groove 3051, one end of the case body 1 along the first direction is inserted into the locking groove 3051, and sealant is provided in the locking groove 3051, thereby bonding the case body 1 and the tray 3 together and sealing the connection point between the case body 1 and the tray 3. By selectively using sealant, not only can connection and fixation be achieved, but good sealing can also be achieved. In one embodiment, a connecting projection 305 is provided in an annular shape on the upper surface of the tray 3, and the locking groove 3051 is opened in the connecting projection 305.

[0112] As shown in Figures 17-22 (some reference numerals are reused from Figures 1-3, 6-8, and 12-16), the embodiment of the present application further provides a battery pack comprising a battery module 200 sealedly mounted inside a battery case 100, and a battery case 100, the battery case 100 being the battery case 100 according to the embodiment of the present application.

[0113] In one embodiment, after the battery module 200 is attached to the battery case 100, the lower end of the battery cell 211 of the battery module 200 is in close contact with the tray 3 inside the battery case 100, and a space is formed between the upper end of the battery cell 211 and the second closing plate 5 for components such as busbars to be attached, and the separator 2 is locked to the middle of the battery cell 211 in the longitudinal direction, that is, the middle of the battery cell 211 along the first direction, so that the lengths of the battery cell 211 in the first chamber 103 and the second chamber 104 are the same, and uniform heat dissipation is guaranteed.

[0114] The embodiments of this application are as follows: Step S100 provides a coolant, and the coolant enters the second chamber 104 from the inlet 101 of the battery case 100, and along the second direction, from one end of the second chamber 104 where the inlet area 3011 is provided toward the other end furthest from the inlet area 3011, immersing the portion of the battery cell 211 located in the second chamber 104, Step S200 involves the cooling liquid in the second chamber 104 entering the first chamber 103 through the reflux holes 2011 in the separator 2, and immersing the portion of the battery cell 211 located in the first chamber 103 along the second direction, from one end of the first chamber 103 where the reflux holes 2011 are provided toward the other end where the liquid discharge region 2013 is located. The present invention further provides a method for cooling a battery pack, which includes step S300, in which the coolant merges with the outlet region 2013 and is then discharged through the outlet port 102.

[0115] In one embodiment, step S100 is, Step S110 involves the coolant entering the battery case 100 through the inlet 101, passing through the inlet tube 204, and entering the second chamber 104. Step S120 involves the coolant first coming into contact with the flow divider 304 to achieve flow division, and then being uniformly distributed to each of the third flow guide grooves 3021 of the third flow guide assembly 302. Step S130 includes transporting the coolant in the third flow guide groove 3021 into the corresponding flow guide gap 220 of the battery module 200, exchanging heat with the lower half portions of each battery cell 211 on one or both sides of the flow guide gap 220, wherein the direction of transport of the coolant is from one end of the second chamber 104, where the inlet area 3011 is provided, to the other end, which is further from the inlet area 3011, along the second direction. Step S200 is, Step S210 involves the cooling liquid, which has been heated and released from the guide gap 220, coming into contact with the flow guide surface 3031 of the flow guide plate 303, and being guided by the flow guide surface 3031 to the recirculation hole 2011 in the separator 2, Step S220 involves the cooling liquid entering the first chamber 103 through the reflux hole 2011 and flowing toward the side where the outlet region 2013 is located, guided by the flow surface 2051 of the sealing plate 205. Step S230 involves the coolant being guided through the second flow groove 2031 of the second flow assembly 203 into the corresponding flow gap 220, and exchanging heat with the upper half portion of each battery cell 211 on one or both sides of the flow gap 220, The process includes step S240, in which the coolant in the flow guide gap 220 enters the first flow guide groove 2021 of the first flow guide assembly 202 and merges with the outlet region 2013 through all of the first flow guide grooves 2021.

[0116] Alternatively, 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 back to the inlet 101 to cool the battery module 200 inside the battery case 100 again.

[0117] The separators 2 and trays 3 within the battery case 100 are not limited to being distributed vertically, but may also be distributed horizontally; that is, the first direction may be horizontal, and the second direction is not limited to being the length direction of the battery case 100, nor is the third direction 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 (along the arrows), entering from the second chamber 104, then moving upward from bottom to top to cool the portion of the battery cell 211 located inside the second chamber 104. Once the coolant reaches the top of the second chamber 104, it passes through the recirculation port 2011 and enters the first chamber 103. It flows downward from the top of the first chamber 103, entering the portion of the battery cell 211 located inside the first chamber 103 to cool it down, and finally is discharged to the outside of the battery case 100 from the outlet port 102 at the bottom of the first chamber 103.

[0118] Of course, the first direction is not limited to horizontal; it may also form a certain angle with the horizontal direction. For specific details on the cooling path of the coolant, please refer to the previous example, and we will not explain it again here. [Explanation of symbols]

[0119] 100... Battery case, 1. Case body, 101...Inlet, 102...Outlet, 103...First chamber, 104...Second chamber, 105...First side plate, 106...Second side plate, 107...Third groove, 108...Protruding structure, 109...Recessed groove structure, 1010...Mounting part, 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...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 internal guide plate, 303...Flow guide plate, 3031...Flow guide surface, 304...Flow divider, 3041...Flow divider top surface, 3042...Flow divider outer surface, 30421...Connecting surface, 30422...Flow divider guide surface, 3043...Flow divider bottom surface, 305...Connecting protrusion, 3051...Engagement groove, 306...Support column, 4...First closure plate, 5...Second closure plate, 6...Inlet fitting, 7...Outlet fitting, 200...Battery module, 210...Battery cell group, 211...Battery cell, 220...Flow guide gap.

Claims

1. Applied to a battery case, comprising a first body and a first flow guide assembly, The first body has a recirculation hole and a plurality of mounting holes configured for mounting battery cells of a battery module, which are provided through the first direction, and the first body has a liquid outlet region formed on one of its sides along the first direction, which is configured to communicate with the liquid outlet of the battery case, and the liquid outlet region and the recirculation hole are close to both ends of the first body along the second direction, and the mounting holes are located between the liquid outlet region and the recirculation hole, and the recirculation hole is configured to draw the coolant from the side of the first body away from the liquid outlet region to the side of the first body where the liquid outlet region is provided, so that the coolant sequentially immerses the battery cells protruding from the first body from the position where the recirculation hole is located, and the first direction and the second direction are provided at a narrow angle, The first flow guide assembly and the liquid outlet region are located on the same side surface of the first body, and the first flow guide assembly comprises a plurality of first flow guide grooves, all of which have first ends communicating with the liquid outlet region and second ends communicating with the region where the battery module is located, and is configured to introduce the coolant in the region where the battery module is located into the liquid outlet region. Separator.

2. The battery module has a plurality of rows of battery cells arranged along a third direction, each row of the battery cell group comprises a plurality of the battery cells arranged along the second direction, the third direction is provided at an angle with the first and second directions, a flow guide gap is formed between at least two adjacent rows of the battery cell group, and there is a one-to-one correspondence between the plurality of first flow guide grooves and the plurality of flow guide gaps. The separator according to claim 1.

3. Along the third direction, there is a gap between each of the sides of the first body and the wall of the mounting hole, thereby forming the flow 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 comprises a plurality of spaced-apart first flow guide plates, with a first flow guide groove formed between two adjacent first flow guide plates, and the first flow guide plates extending from a first end to the liquid discharge region and from a second end to a region adjacent to the battery module. The separator according to claim 2.

5. The first 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. In the first body, in the area located in the liquid discharge region, a confluence groove is provided that communicates with each of the first flow guide grooves. The separator according to claim 1.

7. The first flow guide assembly comprises a plurality of first flow guide plates spaced apart, with the first flow guide groove formed between two adjacent first flow guide plates. The two first flow guide plates located on the outermost side of the first flow guide assembly along the third direction are first outer flow guide plates, and the ends of the two first outer flow guide plates furthest from the battery cell are connected, and the first flow guide plates other than the two first outer flow guide plates are first inner flow guide plates, and the end of the first inner flow guide plate closest to the first outer flow guide plate and the inner wall of the first outer flow guide plate are spaced apart to form the liquid outlet region. The separator according to claim 1.

8. The first body has an immersion hole that penetrates it along the first direction, the immersion hole is located between adjacent mounting holes and is provided in accordance with the gap between adjacent battery cells, and its size is smaller than the size of the recirculation hole. A separator according to any one of claims 1 to 7.

9. The sum of the areas of all the immersion holes in the first body is S1, the area of ​​the first body is S2, and the ratio between S1 and S2 satisfies 1:25000 to 3:50000. and / or, the area of ​​a single immersion hole is S3, the area of ​​a single recirculation hole is S4, and the ratio between S3 and S4 satisfies 2:25 to 1:

8. and / or, the sum of the areas of all the immersion holes in the first body is S1, and the sum of the areas of all the recirculation holes in the first body is S5, and the ratio of S1 to S5 satisfies 1:2 to 2:

3. The separator according to claim 8.

10. The immersion hole is at least one of the following: semicircular hole, circular hole, elliptical hole, rectangular hole, polygonal hole, and irregularly shaped hole. and / or, the reflux pore is at least one of the following: semicircular pore, circular pore, elliptical pore, rectangular pore, polygonal pore, and irregularly shaped pore. The separator according to claim 8.

11. The first body is provided with a second flow guide assembly that is adjacent to the recirculation hole, located on the same side surface as the first flow guide assembly and the first body, and each of which has a plurality of second flow guide grooves that connect the recirculation hole and the region where the battery module is located. A separator according to any one of claims 1 to 7.

12. The battery module has a plurality of rows of battery cells arranged along a third direction, each row of the battery cell group comprises a plurality of the battery cells arranged along the second direction, the third direction is provided at an angle with the first and second directions, a flow guide gap is formed between at least two adjacent rows of the battery cell group, and there is a one-to-one correspondence between the plurality of second flow guide grooves and the plurality of flow guide gaps. The separator according to claim 11.

13. The second flow guide assembly comprises a plurality of spaced second flow guide plates, the second flow guide groove is formed between two adjacent second flow guide plates, the second flow guide plates extend to a region where the first end is close to the battery cell, and at least one recirculation hole is disposed between two adjacent second flow guide plates. The separator according to claim 12.

14. The second guide plate is, The width of the second end, which is farther from the liquid discharge region, is L3, and the width of the first end, which is close to the liquid discharge 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 main body is provided with an inlet pipe fixed to the outlet region, and a via hole is provided in the outlet region that communicates with the inlet pipe and penetrates the first main body. A separator according to any one of claims 1 to 7.

16. The first body is provided with a plurality of recirculation holes spaced apart along the third direction, or the recirculation holes are provided extending along the third direction. The first body is further provided with a sealing plate located between the recirculation hole and the end face of one end of the first body adjacent to the recirculation hole along the second direction, the length of the sealing plate extending along the third direction, and the sealing plate protruding from the side surface of the first body on which the first flow guide assembly is provided. A separator according to any one of claims 1 to 7.

17. A sloping flow guide surface is provided on one side of the blocking plate near the return hole, and the flow guide surface extends in the first direction from one end closer to the first body to one end further away from the first body, and slopes in the second direction toward the first flow guide assembly. The separator according to claim 16.

18. Each of the end faces of the first body along the third direction is provided with a group of first grooves, each of which is recessed toward the region between two adjacent mounting holes spaced apart along the second direction. A separator according to any one of claims 1 to 7.

19. Equipped with a case body and separator, The case body is provided with an inlet and an outlet at a distance from each other, and the case body is provided with a housing chamber configured to house a battery module. The separator is provided within the containment chamber and divides the containment chamber into a first chamber and a second chamber distributed along a first direction. The separator has a plurality of mounting holes configured for mounting the battery cells of the battery module, with both ends of the battery cells in the first direction extending into the first chamber and the second chamber, respectively. The separator has a recirculation hole, and the separator has a liquid outlet region communicating with the liquid outlet, the liquid outlet region located within the first chamber, and the liquid outlet region and the recirculation hole are each along the second direction of the separator. The return holes are located close to both ends of the separator and are configured to draw the coolant from the side of the separator away from the outlet region to the side of the separator where the outlet region is provided. As a result, the coolant sequentially immerses the battery cells protruding from the separator from the position where the return holes are located, the outlet communicates with the outlet region, there is an inlet region in the second chamber, the inlet region and the outlet region are located close to the same end of the case body along the second direction, the inlet communicates with the inlet region, and the first direction and the second direction are provided at a narrow angle. Battery case.

20. Equipped with a battery module and a battery case, The battery module is sealed inside the battery case, and the battery case is the battery case described in claim 19. Battery pack.

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