Battery box, battery pack and cooling method of battery pack

Abstract

The application discloses a battery box, a battery pack and a cooling method of the battery pack. The battery box comprises a box body and a partition plate. The box body is provided with a liquid inlet and a liquid outlet at intervals, and is provided with an accommodating cavity. The partition plate is arranged in the accommodating cavity. The partition plate divides the accommodating cavity into a first chamber and a second chamber which are distributed along a first direction. A plurality of mounting holes for mounting battery cells of a battery module are formed in the partition plate. Two ends of the battery cells in the first direction extend into the first chamber and the second chamber respectively. A backflow hole is formed in the partition plate. The partition plate has a liquid outlet area which is communicated with the liquid outlet. The liquid outlet area is located in the first chamber. The liquid outlet area and the backflow hole are adjacent to two ends of the partition plate along a second direction respectively. The liquid outlet is communicated with the liquid outlet area. The second chamber has a liquid inlet area. The liquid inlet area and the liquid outlet area are adjacent to the same end of the box body along the second direction respectively. The liquid inlet is communicated with the liquid inlet area. The battery box can make the heat exchange of the battery cells mounted therein uniform.

Description

[0001] The present application claims priority to patent application No. PCT / CN2024 / 094021 (the filing date of the prior application is May 17, 2024, and the patent application name is Partition, Tray, Battery Box, Battery Pack and Cooling Method of Battery Pack). TECHNICAL FIELD

[0002] The present application relates to the technical field of batteries, in particular to a battery box and a battery pack comprising the battery box, and a cooling method of the battery pack. BACKGROUND

[0003] The battery pack generally comprises a battery box and a battery module arranged in the battery box, and the battery module is formed by arranging a plurality of battery cells in a set manner. Heat dissipation of the battery pack is extremely important, and the heat dissipation effect directly affects the service life of the battery pack. At present, the battery pack adopts air cooling, water cooling plate and immersion cooling liquid for heat dissipation. For the immersion cooling liquid heat dissipation mode, the cooling liquid is directly sent into the battery box to contact the battery cell shell for heat exchange. At present, this heat dissipation mode generally sets a liquid inlet at one end of the length direction of the battery box and sets a liquid outlet at the other end. The cooling liquid is introduced through the liquid inlet, and after the cooling liquid immerses the battery cell, it flows out from the liquid outlet. The cooling liquid is cooled outside the battery box, and then is transported to the liquid inlet for circulation to cool the battery cell of the battery module.

[0004] In the related art, after the cooling liquid enters the battery box, more cooling liquid with lower temperature can be contacted near the liquid inlet, while less or even no cooling liquid with lower temperature can be contacted far from the liquid inlet, resulting in that part of the battery cells in the battery box cannot be immersed by the cooling liquid with lower temperature. This part of the battery cells is prone to poor heat exchange effect, and the battery cells with poor heat exchange effect will be prematurely aged and have reduced capacity, thereby reducing the service life of the battery pack. SUMMARY

[0005] The purpose of the embodiments of the present application is to provide a battery box and a battery pack, which have simple structure, uniform heat exchange of battery cells and long service life of the battery pack.

[0006] The purpose of the embodiments of the present application is to provide a cooling method of a battery pack, which can effectively improve the uniformity of the heat dissipation effect of each battery cell in the battery pack to prolong the service life of the battery pack.

[0007] To achieve the above purpose, the present application adopts the following technical solutions:

[0008] In a first aspect, a battery box is provided, comprising:

[0009] A box body, a liquid inlet and a liquid outlet are arranged on the box body at intervals, and a containing cavity for containing a battery module is arranged in the box body;

[0010] A partition plate is arranged in the containing cavity, the containing cavity is divided into a first chamber and a second chamber along a first direction by the partition plate, a plurality of mounting holes for mounting battery cells of the battery module are arranged on the partition plate, two ends of the battery cells extend into the first chamber and the second chamber respectively, a backflow hole is arranged on the partition plate, the partition plate has a liquid outlet area in communication with the liquid outlet, the liquid outlet area is located in the first chamber, the liquid outlet area and the backflow hole are adjacent to two ends of the partition plate along a second direction respectively, the liquid outlet is in communication with the liquid outlet area, the second chamber has a liquid inlet area, the liquid inlet area and the liquid outlet area are adjacent to the same end of the box body along the second direction respectively, and the liquid inlet is in communication with the liquid inlet area, wherein the first direction and the second direction are arranged at an angle.

[0011] In a second aspect, a battery pack is provided, comprising a battery module and a battery box, and the battery module is sealedly mounted in the battery box.

[0012] In a third aspect, a cooling method of a battery pack is provided, and the method is applied to the battery pack, comprising the following steps:

[0013] Cooling liquid is provided, and the cooling liquid enters the second chamber from the liquid inlet of the battery box, and the part of the battery cell located in the second chamber is immersed from one end of the second chamber provided with the liquid inlet area to the other end away from the liquid inlet area along the second direction;

[0014] The cooling liquid in the second chamber enters the first chamber through the backflow hole on the partition plate, and the part of the battery cell located in the first chamber is immersed from one end of the first chamber provided with the backflow hole to the other end where the liquid outlet area is located along the second direction;

[0015] The cooling liquid is collected in the liquid outlet area and discharged through the liquid outlet of the battery box.

[0016] Beneficial effects: the battery box body of the application is provided with a partition plate, the accommodating cavity in the box body is divided into independent first and second chambers by the partition plate, the two chambers are relatively sealed after the partition plate is installed with the battery cell, the cooling liquid first enters the liquid inlet area of the second chamber from the liquid inlet, then sequentially immerses the part of the battery cell in the second chamber from one end close to the liquid inlet area to the end far from the liquid inlet area along the second direction, exchanges heat with the battery cell, then enters the first chamber through the backflow hole on the partition plate, sequentially immerses the part of the battery cell in the first chamber from the side where the backflow hole is located to the liquid outlet area, exchanges heat with the remaining part of the battery cell, and the cooling liquid collected in the liquid outlet area is discharged through the liquid outlet after the heat exchange is completed. The whole process exchanges heat with the battery cell of the battery module in steps, the special immersion path of the cooling liquid increases the probability of each battery cell contacting the cooling liquid, improves the uniformity and effect of heat exchange of all battery cells, and prolongs the service life of the battery cell. BRIEF DESCRIPTION OF DRAWINGS

[0017] The application will be further described in detail below according to the drawings and embodiments.

[0018] Figure 1 It is a front view schematic diagram of the partition plate of the embodiment of the application.

[0019] Figure 2 It is a perspective view schematic diagram of the partition plate of the embodiment of the application.

[0020] Figure 3 It is another perspective view schematic diagram of the partition plate of the embodiment of the application.

[0021] Figure 4 It is an enlarged schematic diagram of A of Figure 1

[0022] Figure 5 It is an enlarged schematic diagram of B of Figure 1

[0023] Figure 6 It is a front view schematic diagram of the tray of the embodiment of the application.

[0024] Figure 7 It is a perspective view schematic diagram of the tray of the embodiment of the application.

[0025] Figure 8 It is another perspective view schematic diagram of the tray of the embodiment of the application.

[0026] Figure 9 It is an enlarged schematic diagram of C of Figure 6

[0027] Figure 10 It is a perspective view schematic diagram of the tray and the box body of the embodiment of the application being an integrated structure.

[0028] ​​​Figure 11 Another perspective view of the tray and the box body of the embodiment of the present application.

[0029] Figure 12 A top view of the battery box of the embodiment of the present application.

[0030] Figure 13 A perspective view of the battery box of the embodiment of the present application.

[0031] Figure 14 Another perspective view of the battery box of the embodiment of the present application.

[0032] Figure 15 A top view of the battery box of the embodiment of the present application (the second sealing plate is not shown).

[0033] Figure 16 A perspective view of the battery box of the embodiment of the present application (the second sealing plate is not shown).

[0034] Figure 17 A top view of the battery pack of the embodiment of the present application (the second sealing plate is not shown).

[0035] Figure 18 A perspective view of the battery pack of the embodiment of the present application (the second sealing plate is not shown).

[0036] Figure 19 An exploded view of the battery pack of the embodiment of the present application.

[0037] Figure 20 A perspective view of the box body of the embodiment of the present application.

[0038] Figure 21 Another perspective view of the box body of the embodiment of the present application.

[0039] Figure 22 A sectional view of the battery pack of the embodiment of the present application (the arrow direction is the flow direction of the cooling liquid).

[0040] Figure 23 A partial sectional view of the partition plate of the embodiment of the present application.

[0041] Figure 24 A sectional view of the flow distribution member of the embodiment of the present application.

[0042] In the drawings:

[0043] 100, battery box;

[0044] 1, box body;

[0045] 101, liquid inlet; 102, liquid outlet; 103, first chamber; 104, second chamber; 105, first side plate; 106, second side plate; 107, third groove; 108, protruding structure; 109, recessed structure; 1010, mounting portion; 1011, sealing groove; 1012, step; 1013, second pressure relief hole; 1014, opening;

[0046] 2, partition plate;

[0047] 201, first body; 2011, backflow hole; 20111, arc-shaped hole wall; 20112, planar hole wall; 2012, mounting hole; 2013, liquid outlet area; 2014, first protrusion; 2015, immersion hole; 2016, first groove; 2017, via hole; 2018, collection groove; 202, first flow guide assembly; 2021, first flow guide groove; 2022, first flow guide plate; 20221, first outer flow guide plate; 20222, first inner flow 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;

[0048] 3, tray;

[0049] 301, second body; 3011, liquid inlet area; 3012, mounting groove; 3013, first pressure relief hole; 3014, second groove; 3015, pressure relief groove; 3016, second protrusion; 302, third flow guide assembly; 3021, third flow guide groove; 3022, third flow guide plate; 30221, third outer flow guide plate; 30222, third inner flow guide plate; 303, drainage plate; 3031, drainage surface; 304, flow distribution piece; 3041, flow distribution top surface; 3042, flow distribution outer peripheral surface; 30421, connecting surface; 30422, flow distribution guide surface; 3043, flow distribution bottom surface; 305, connecting protrusion; 3051, clamping groove; 306, support column;

[0050] 4, first sealing plate; 5, second sealing plate; 6, liquid inlet connector; 7, liquid outlet connector;

[0051] 200, battery module; 210, group of battery cells; 211, battery cell; 220, flow guide gap. DETAILED DESCRIPTION

[0052] As Figures 1 to 3 shown (see Figures 15 to 17 , Figure 19 and Figure 22), the embodiment of the present application provides a partition plate 2, which is applied to a battery box 100 of a battery pack, in the embodiment, a first direction is a vertical direction (a height direction of the battery box 100, that is, a height direction of the partition plate 2), a second direction is a length direction of the battery box 100, that is, a length direction of the partition plate 2, and a third direction is a width direction of the battery box 100, that is, a width direction of the partition plate 2.

[0053] In the embodiment, the partition plate 2 comprises a first body 201 and a first flow guide assembly 202, wherein the first body 201 is provided with a plurality of installation holes 2012 and a backflow hole 2011 penetratingly formed along the first direction, the installation holes 2012 are arranged to install the battery cells 211 of the battery module 200 in the battery box 100, the first body 201 is formed with a liquid outlet area 2013 on the upper side along the first direction, the liquid outlet area 2013 is arranged to communicate with the liquid outlet 102 of the battery box 100, the cooling liquid collected to the liquid outlet area 2013 will be discharged to the outside of the battery box 100 through the liquid outlet 102, the liquid outlet area 2013 and the backflow hole 2011 are respectively adjacent to both ends of the first body 201 along the second direction, that is, the liquid outlet area 2013 and the backflow hole 2011 are located at both ends of the length direction of the partition plate 2, the installation holes 2012 are located between the liquid outlet area 2013 and the backflow hole 2011, and the first flow guide assembly 202 and the liquid outlet area 2013 are located on the upper side of the first body 201, the first flow guide assembly 202 comprises a plurality of first flow guide grooves 2021, one end of all the first flow guide grooves 2021 communicates with the liquid outlet area 2013, and the other end communicates with the area where the battery module 200 is located, and the first flow guide assembly 202 is arranged to guide the cooling liquid in the area where the battery module 200 is located to the liquid outlet area 2013.

[0054] The partition plate 2 of the embodiment can guide the cooling liquid on the side (that is, the lower side of the partition plate 2) of the first body 201 away from the liquid outlet area 2013 into the side (that is, the upper side of the partition plate 2) of the first body 201 provided with the liquid outlet area 2013 through the backflow hole 2011 penetratingly formed on the first body 201, and the backflow hole 2011 and the liquid outlet area 2013 are respectively adjacent to both ends of the first body 201 along the second direction, so that the cooling liquid can sequentially immerse the battery cells 211 protruding from the first body 201 from the position of the backflow hole 2011, and then be collected to the liquid outlet area 2013 after heat exchange and be discharged through the liquid outlet 102, thereby increasing the heat exchange effect of the battery cells 211, and in addition, the first flow guide assembly 202 arranged between the liquid outlet area 2013 and the battery module 200 can collect all the cooling liquid of the battery cells 211 after heat exchange to the liquid outlet area 2013 as soon as possible, accelerate the discharge of the cooling liquid at a higher temperature after heat exchange, and improve the cooling effect.

[0055] In an embodiment, the battery module 200 has a plurality of rows of cell groups 210 arranged along a third direction, each row of cell groups 210 includes a plurality of cells 211 arranged along a second direction, the third direction is arranged at an angle with respect to the first direction and the second direction, at least a flow guide gap 220 is formed between adjacent two rows of cell groups 210, and a plurality of first flow guide grooves 2021 correspond to the plurality of flow guide gaps 220 one by one. By corresponding the flow guide gap 220 between the cell groups 210 and the first flow guide groove 2021 one by one, after the cooling liquid is introduced through the backflow hole 2011, the cooling liquid will be distributed through the plurality of flow guide gaps 220, increasing the opportunity for each cell 211 of each row of cell groups 210 to contact the cooling liquid, and after the cooling liquid of the adjacent two rows of cell groups 210 exchanges heat, most of the cooling liquid is collected through the first flow guide groove 2021 to the liquid outlet area 2013, and then is discharged to the outside of the battery box 100 through the liquid outlet 102 as soon as possible, reducing the backflow or mixing of the cooling liquid after the heat exchange of the adjacent two rows of cell groups 210 to other rows of cell groups 210, thereby avoiding the situation that the local heat exchange efficiency of the cell 211 is low.

[0056] In an embodiment, the two end faces of the first body 201 along the third direction are spaced apart from the hole wall of the mounting hole 2012, so that the flow guide gap 220 is also formed on both sides of the battery module 200 along the third direction. In an embodiment, since the mounting hole 2012 is spaced apart from the two end faces of the first body 201 along the third direction, the cell 211 can be spaced apart from the end face of the first body 201 (i.e. the separator 2) after installation. After the separator 2 is installed in the battery box 100, a space can be formed between the cell 211 and the inner side wall of the battery box 100, which is also a flow guide gap 220 for the cooling liquid. The flow guide gap 220 corresponding to this position is also provided with a first flow guide groove 2021 corresponding thereto, so that the cells 211 on both sides of the battery module 200 along the third direction can also contact the cooling liquid with lower temperature, ensuring uniform heat exchange of the cells 211 at this position.

[0057] In an embodiment, the first flow guide assembly 202 includes a plurality of first flow guide plates 2022 arranged at intervals, a first flow guide groove 2021 is formed between adjacent two first flow guide plates 2022, one end of the first flow guide plate 2022 extends to the liquid outlet area 2013, and the other end extends to a region adjacent to the battery module 200. The first flow guide plate 2022 arranged outward can reduce the overall thickness of the first body 201, reduce the occupied space of the entire separator 2 in the battery box 100, improve the energy density of the entire battery pack, and reduce the area of the cell 211 blocked by the first body 201, thereby allowing the cell 211 to be soaked in the cooling liquid for heat dissipation.

[0058] In one embodiment, the first guide vane 2022 and the first body 201 are integrally injection molded from plastic. This integral injection molding method reduces the difficulty of installing and manufacturing the first guide vane 2022, reduces the number of parts, and lowers costs. Alternatively, the first guide vane 2022 can be manufactured separately and then fixed to the first body 201 by bonding, welding, screw connection, snap-fitting, or other methods.

[0059] In other embodiments, instead of providing a separate first guide plate 2022, the thickness of the first body 201 can be increased, and a groove can be cut into the first body 201 to form a first guide groove 2021.

[0060] In one embodiment, such as Figure 4 As shown (see attached) Figures 1 to 3 Appendix Figures 15 to 17 , Figure 19 and Figure 22 The width of the first guide plate 2022 near the liquid outlet area 2013 is L1, and the width of the first guide plate 2022 near the cell 211 is L2, where L1 is smaller than L2. By widening the width of the portion of the first guide plate 2022 near the cell 211, the amount of coolant entering other areas within the guide gap 220 can be minimized. Conversely, the width of the end of the first guide plate 2022 near the liquid outlet area 2013 is reduced to create a converging effect. Since the size of the liquid outlet area 2013 is generally designed to be smaller than the width of the battery module 200 (i.e., the dimension of the battery module 200 along a third direction), the first guide assembly 202 needs to be tightened.

[0061] The end face shape of the first guide plate 2022 adjacent to the end of the battery cell 211 matches the shape of the battery cell 211. This design is to make the first guide plate 2022 fit the shape of the battery cell 211 better, forming a better flow guiding effect, so that the coolant in the flow guiding gap 220 can enter the first flow guiding groove 2021 with less resistance.

[0062] In this embodiment, the battery cell 211 is a cylindrical battery cell, and the end face of the first guide plate 2022 near the battery cell 211 is an arc surface. Of course, the battery cell 211 is not limited to being cylindrical, but can also be square, polygonal, or irregularly shaped. In this case, the shape of the end face of the first guide plate 2022 near the battery cell 211 can be adjusted according to the shape of the battery cell 211.

[0063] In addition, the end face of the first guide plate 2022 adjacent to one end of the cell 211 is spaced apart from the outer wall of the cell 211. This design can prevent the first guide plate 2022 from directly abutting against the outer wall of the cell 211, thereby preventing the first guide plate 2022 from blocking the cell 211 and allowing the cell 211 to have as much contact and heat exchange as possible with the coolant.

[0064] In an embodiment, as shown (see attached drawings) Figure 23 Figures 1 to 22 The first body 201 is provided with a collection groove 2018 in the recessed position of the liquid outlet area 2013, and all the first flow guide grooves 2021 are in communication with the collection groove 2018. The recessed collection groove 2018 can improve the collection effect, accelerate the collection of the cooling liquid in the first flow guide groove 2021 into the collection groove 2018, and reduce the probability of the cooling liquid in the first flow guide groove 2021 flowing back into the flow guide gap 220 of the battery module 200.

[0065] In this embodiment, the collection groove 2018 is an arc-shaped groove. This design can reduce the resistance of the cooling liquid when it is collected in the collection groove 2018, accelerate the collection of the cooling liquid in the collection groove 2018, and quickly transport the cooling liquid to the outside of the battery box 100 through the liquid outlet 102.

[0066] In an embodiment, the two first flow guide plates 2022 located at the outermost side of the first flow guide assembly 202 in the third direction are first outer flow guide plates 20221, and the two first outer flow guide plates 20221 are connected away from the end of the battery cell 211. The remaining first flow guide plates 2022 are first inner flow guide plates 20222, and the end of the first inner flow guide plate 20222 close to the first outer flow guide plate 20221 is spaced from the inner side wall of the first outer flow guide plate 20221 to form a liquid outlet area 2013. By setting the liquid outlet area 2013 in the first flow guide assembly 202 and shielding the liquid outlet area 2013 with the two first outer flow guide plates 20221, the cooling liquid introduced by the first flow guide groove 2021 can be effectively prevented from entering the outside of the liquid outlet area 2013.

[0067] Of course, the two first outer flow guide plates 20221 can also be not connected, and the first outer flow guide plate 20221 can be extended. After the partition plate 2 and the box body 1 of the battery box 100 are installed, the end of the first outer flow guide plate 20221 away from the battery cell 211 abuts against the inner side wall of the box body 1, and the same effect can also be achieved.

[0068] ​In an embodiment, the immersion hole 2015 is formed through the first body 201 in the first direction, is located between the adjacent mounting holes 2012, and is formed corresponding to the gap between the adjacent battery cells 211. The size of the immersion hole 2015 is smaller than the size of the backflow hole 2011. By arranging the immersion hole 2015, the part of the cooling liquid with lower temperature from the lower area of the first body 201 can be used to exchange heat with the battery cells 211 in the upper area of the first body 201, so as to improve the cooling effect. After the cooling liquid introduced by the backflow hole 2011 enters the flow guide gap 220 of the battery module 200 located above the first body 201, the cooling liquid is mixed with the part of the cooling liquid passing through the immersion hole 2015 to exchange heat with the battery cells 211. The temperature of the cooling liquid in the upper area of the first body 201 is higher than the temperature of the cooling liquid in the lower area. In order to make the cooling effect of the upper and lower parts of the battery cells 211 consistent, the immersion hole 2015 has the effect of supplementing the cooling liquid with lower temperature, mixing the cooling liquid introduced by the backflow hole 2011, and reducing the temperature of the cooling liquid in the upper area of the first body 201. By arranging the size of the immersion hole 2015 to be smaller than the size of the backflow hole 2011, the amount of the cooling liquid passing through the immersion hole 2015 can be reduced, so as to avoid affecting the amount of the cooling liquid at the backflow hole 2011, and make the battery cells 211 adjacent to the backflow hole 2011 maintain normal heat exchange and cooling effect.

[0069] In the embodiment, the sum of the areas of all the immersion holes 2015 in the first body 201 is S1, the area of the first body 201 is S2, and the relationship between S1 and S2 satisfies the ratio of 1:25000-3:50000. For example, the relationship between S1 and S2 can be 1:25000, 1:20000, 3:50000, etc. After the sum of the areas of the immersion holes 2015 satisfies the above ratio, a reasonable amount of immersion liquid can be maintained, and the situation that the amount of immersion liquid is too large to affect the flow of the cooling liquid at the backflow hole 2011 can be avoided.

[0070] The area of a single immersion hole 2015 is S3, and the area of a single backflow hole 2011 is S4. The relationship between S3 and S4 satisfies the ratio of 2:25-1:8. For example, the relationship between S3 and S4 can be 2:25, 2:23, 2:20, 2:18, 2:17, or 1:8, etc. The area of a single immersion hole 2015 needs to be much smaller than the area of a single backflow hole 2011, which is beneficial to make most of the cooling liquid flow to the upper area of the first body 201 through the backflow hole 2011, and push the cooling liquid to the liquid outlet area 2013, so as to reduce the turbulence phenomenon.

[0071] The sum of the areas of all the immersion holes 2015 on the first body 201 is S1, the sum of the areas of all the backflow holes 2011 on the first body 201 is S5, and the relationship between S1 and S5 can satisfy: 1:2-2:3, for example, the relationship between S1 and S5 can be 1:2, 1:1.92, 1:1.85, 1:1.79, 1:1.72, 1:1.67, 1:1.61, 1:1.56, or 2:3, etc. The immersion holes 2015 are arranged to penetrate the cooling liquid to exchange heat with the battery cell 211, improve the overall cooling uniformity of the battery cell 211, and reduce the temperature difference. However, the total area of the immersion holes 2015 needs to be smaller than the total area of the backflow holes 2011, which is conducive to the backflow of the cooling liquid to the area above the first body 201 through the backflow holes 2011, and promotes the flow of the cooling liquid to the liquid outlet area 2013, reducing the turbulence phenomenon.

[0072] In this embodiment, the immersion hole 2015 is a circular hole. In other embodiments, the immersion hole 2015 can also be at least one of a semicircular hole, an elliptical hole, a square hole, a polygonal hole, and a special-shaped hole, for example, the first body 201 is provided with both circular immersion holes 2015 and semicircular immersion holes 2015.

[0073] In this embodiment, the backflow hole 2011 is a semicircular hole, and the arc-shaped hole wall 20111 of the backflow hole 2011 is located on the side of the planar hole wall 20112 facing the battery cell 211.

[0074] In an embodiment, a plurality of backflow holes 2011 are arranged on the first body 201 along the third direction, the number of backflow holes 2011 is consistent with the number of flow guide gaps 220 of the battery module 200, and the positions are also one-to-one corresponding arrangement, that is, one flow guide gap 220 corresponds to one backflow hole 2011. This design enables the backflow hole 2011 to introduce the cooling liquid below the first body 201 to the upper side of the first body 201 as evenly as possible into the corresponding flow guide gap 220, thereby improving the heat exchange and heat dissipation effect of the cooling liquid on each battery cell 211.

[0075] The first body 201 is further provided with a baffle plate 205 located between the backflow hole 2011 and an end face of the first body 201 adjacent to the backflow hole 2011 in the second direction. The baffle plate 205 extends in the third direction, and the baffle plate 205 protrudes from an upper side of the first body 201 (i.e., the baffle plate 205 protrudes from the upper side of the first body 201). The backflow hole 2011 is a certain distance away from the end of the first body 201. After the partition plate 2 is installed in the cabinet body 1, there is still space between the backflow hole 2011 and the cabinet body 1. If the baffle plate 205 is not provided, when the cooling liquid enters the upper side of the first body 201 from the backflow hole 2011, part of the cooling liquid is likely to accumulate in this space and cannot smoothly enter the flow guide gap 220 of the battery module 200 for heat exchange. Therefore, the baffle plate 205 can effectively prevent the cooling liquid from staying in the space between the hole wall of the backflow hole 2011 and the cabinet body 1, so that the cooling liquid entering the upper side of the first body 201 from the backflow hole 2011 below the first body 201 can all enter the flow guide gap 220 of the battery module 200 for heat exchange. In an embodiment, the two ends of the baffle plate 205 in the third direction are respectively abutted against the two inner side walls of the cabinet body 1 in the third direction. This design is to reduce the phenomenon of the cooling liquid staying in the area of the two ends of the baffle plate 205 in the third direction.

[0076] In an embodiment, an inclined baffle plate flow guide surface 2051 is arranged on a side of the baffle plate 205 close to the backflow hole 2011. The baffle plate flow guide surface 2051 is inclined from an end close to the first body 201 to an end away from the first body 201 and towards a side where the first flow guide assembly 202 is located (i.e., the baffle plate flow guide surface 2051 extends from an end close to the first body 201 to an end away from the first body 201 in the first direction, and is inclined towards the side close to the first flow guide assembly 202 in the second direction). The inclined baffle plate flow guide surface 2051 can guide the cooling liquid led out of the backflow hole 2011 towards the first flow guide assembly 202 and the side where the battery module 200 is located, thereby accelerating the flow of the cooling liquid into the flow guide gap 220. In an embodiment, a side edge of the baffle plate flow guide surface 2051 close to the first body 201 is flush with the planar hole wall 20112 of the backflow hole 2011. This design can ensure that the cooling liquid led out of the backflow hole 2011 can all be guided by the baffle plate flow guide surface 2051, and the resistance of the cooling liquid to the baffle plate 205 is reduced, thereby accelerating the flow of the cooling liquid.

[0077] Of course, the backflow hole 2011 is not limited to a semicircular hole, but can also be at least one of a circular hole, an oval hole, a square hole, a polygonal hole, and a special-shaped hole. For example, the first body 201 is provided with both a backflow hole 2011 in the form of a semicircular hole and a backflow hole 2011 in the form of a circular hole. In addition, the backflow hole 2011 is not limited to a plurality of holes, but can also be only one hole. When the backflow hole 2011 is only one hole, the length of the backflow hole 2011 can be set to extend in the third direction, so that the backflow hole 2011 can transport cooling liquid to all the flow guide gaps 220.

[0078] The blocking plate 205 is manufactured separately from the first body 201, and the lower surface of the blocking plate 205 abuts against the upper side of the first body 201. In order to prevent cooling liquid from entering the position where the blocking plate 205 abuts against the first body 201, a sealing gasket can also be arranged between the blocking plate 205 and the first body 201. In other embodiments, the blocking plate 205 and the first body 201 can also be integrally injection molded, which can reduce the manufacturing difficulty.

[0079] In addition, the blocking plate 205 can also be provided with a hollow structure, which can reduce the weight of the blocking plate 205 and the weight of the entire partition plate 2.

[0080] In an embodiment, the first body 201 is provided with a second flow guide assembly 203 adjacent to the backflow hole 2011. The second flow guide assembly 203 is located on the same side of the first body 201 as the first flow guide assembly 202, that is, the second flow guide assembly 203 is also located on the upper side of the first body 201. The second flow guide assembly 203 includes a plurality of second flow guide grooves 2031, and all the second flow guide grooves 2031 are respectively connected to the backflow hole 2011 and the area where the battery module 200 is located. By arranging the second flow guide assembly 203, the second flow guide assembly 203 can guide the cooling liquid introduced by the backflow hole 2011 in a directional manner, so as to guide the cooling liquid of the backflow hole 2011 to the battery module 200 for heat dissipation as much as possible. The arrangement of the plurality of second flow guide grooves 2031 is also to disperse the cooling liquid and ensure that the battery cells 211 at each position of the battery module 200 can be cooled as evenly as possible.

[0081] In the present embodiment, the plurality of second flow guide grooves 2031 correspond one-to-one to the plurality of flow guide gaps 220. By corresponding the positions and the number of the second flow guide grooves 2031 to the flow guide gaps 220, the cooling liquid introduced by the backflow hole 2011 can pass through the second flow guide grooves 2031, the flow guide gaps 220, and the first flow guide grooves 2021 in sequence to gather in the liquid outlet area 2013, so as to reduce the mixing of the cooling liquid at the second flow guide assembly 203 as much as possible, thereby avoiding the situation that the battery cells 211 have low local heat exchange efficiency.

[0082] In an embodiment, each second flow guide groove 2031 is communicated with one return hole 2011. This design is to achieve uniform distribution, ensure the flow and temperature of the cooling liquid in each flow guide gap 220 are balanced, and then ensure the heat dissipation of the battery cells 211 in each row of battery cell groups 210 is uniform. Of course, each second flow guide groove 2031 is not limited to be communicated with only one return hole 2011, and each second flow guide groove 2031 can also be communicated with two or more return holes 2011. For all second flow guide grooves 2031, the same number of return holes 2011 can be set to be communicated with each second flow guide groove 2031, or different numbers of return holes 2011 can be set to correspond to the second flow guide grooves 2031. If the heat dissipation of the battery cells 211 in the middle of the battery module 200 along the third direction is higher than that of the battery cells 211 on both sides, the number of return holes 2011 corresponding to the battery cells 211 in the middle can be increased, so that the second flow guide groove 2031 in this position is communicated with more return holes 2011, and the flow of the cooling liquid in this position is increased.

[0083] In the embodiment, the second flow guide assembly 203 includes a plurality of second flow guide plates 2032 arranged at intervals, and a second flow guide groove 2031 is formed between two adjacent second flow guide plates 2032. One end of the second flow guide plate 2032 extends to the area adjacent to the battery cell 211. The second flow guide plate 2032 arranged outwardly can reduce the overall thickness of the first body 201, reduce the occupied space of the entire separator 2 in the battery box 100, improve the energy density of the entire battery pack, and reduce the area of the battery cell 211 blocked by the first body 201, so that more areas of the battery cell 211 can be soaked in the cooling liquid for heat dissipation.

[0084] In an embodiment, the second flow guide plate 2032 and the first body 201 are integrally injection molded by plastic. The integrally injection molding method can reduce the installation and manufacturing difficulty of the second flow guide plate 2032, reduce the number of parts, and reduce the cost. Of course, the second flow guide plate 2032 can also be manufactured separately, and then fixed on the first body 201 by bonding, welding, screw connection, clamping and the like.

[0085] In other embodiments, a separate second flow guide plate 2032 can not be provided, and the thickness of the first body 201 can be increased, and the second flow guide groove 2031 can be formed by slotting the first body 201.

[0086] In an embodiment, as shown in Figure 5 the accompanying drawings Figures 1 to 3 , the accompanying drawings Figures 15 to 17 , Figure 19 and Figure 22), the width of the second flow guide plate 2032 away from one end of the liquid outlet area 2013 is L3, and the width of the second flow guide plate 2032 adjacent to one end of the liquid outlet area 2013 is L4, L3 is less than L4. By making the width of the part of the second flow guide plate 2032 close to the battery cell 211 wider, the cooling liquid in the flow guide gap 220 can be minimized to enter other areas, and the width of the second flow guide plate 2032 away from the opening position of the return flow hole 2011 is made small, so as to avoid shielding the return flow hole 2011.

[0087] The end face shape of the second flow guide plate 2032 adjacent to one end of the liquid outlet area 2013 matches the shape of the battery cell 211, which is designed to make the second flow guide plate 2032 more conform to the shape of the battery cell 211, form a better flow guide effect, and make the cooling liquid in the second flow guide groove 2031 enter the flow guide gap 220 with smaller resistance.

[0088] In this embodiment, the end face of the second flow guide plate 2032 close to one end of the battery cell 211 is an arc face. Of course, when the battery cell 211 is of other shapes, the end face shape of the second flow guide plate 2032 close to one end of the battery cell 211 is adjusted according to the shape of the battery cell 211.

[0089] In addition, the end face of the second flow guide plate 2032 adjacent to one end of the battery cell 211 is spaced from the outer side wall of the battery cell 211, which can avoid the second flow guide plate 2032 directly abutting against the outer side wall of the battery cell 211, thereby preventing the second flow guide plate 2032 from shielding the battery cell 211, so that the battery cell 211 can contact more cooling liquid for heat exchange.

[0090] In an embodiment, the first body 201 is provided with a liquid inlet pipe 204, the liquid inlet pipe 204 is fixed to the liquid outlet area 2013, the liquid outlet area 2013 is provided with a through hole 2017 in communication with the liquid inlet pipe 204, and the through hole 2017 penetrates the first body 201. By providing the liquid inlet pipe 204, the liquid of the liquid inlet 101 can be introduced into the area below the first body 201, avoiding mixing of the cooling liquid of the liquid inlet 101 and the liquid outlet area 2013. After the partition plate 2 is installed on the box body 1, the area below the partition plate 2 will first introduce cooling liquid for heat exchange and heat dissipation, and then the cooling liquid will pass through the return flow hole 2011 to enter the area above the partition plate 2, and then the battery cell 211 close to the return flow hole 2011 will be immersed towards the position close to the liquid outlet area 2013 for heat exchange and heat dissipation.

[0091] Of course, the liquid inlet pipe 204 is not limited to being fixed to the liquid outlet area 2013, but can also directly extend into the lower area of the first body 201 after penetrating through the hole 2017. The liquid inlet pipe 204 can also be omitted, and the liquid inlet 101 can be directly arranged in the lower area of the first body 201, i.e., the liquid inlet 101 directly communicates with the lower area of the first body 201.

[0092] In addition, the first body 201, the first flow guide plate 2022, the second flow guide plate 2032, and the liquid inlet pipe 204 are integrally injection molded by plastic. The integrally injection molded mode has low manufacturing cost, few parts, and is convenient to install. Alternatively, the various components on the first body 201, such as the first flow guide plate 2022, the second flow guide plate 2032, and the liquid inlet pipe 204, can be separately manufactured, and then fixed to the first body 201 by welding, bonding, screw connection, or clamping.

[0093] In an embodiment, the first body 201 is provided with a first groove group at each end along the third direction, and each first groove group includes a plurality of first grooves 2016 spaced along the second direction, which are recessed towards the area between the adjacent two mounting holes 2012. By arranging the first grooves 2016, the space at the two ends of the first body 201 along the third direction can be reduced. Since the flow guide gaps 220 between the adjacent cell groups 210 have the same width when the sizes of the cells 211 are the same, if the flow guide gaps 220 at the two sides of the battery module 200 along the third direction are not provided with the first grooves 2016, the flow guide gaps 220 will have different widths, which will cause the cooling effect of the cells 211 at the two sides of the battery module 200 to be inconsistent with that of the cells 211 in the middle. In an embodiment, the first grooves 2016 are arc-shaped grooves, and the adjacent two first grooves 2016 are connected by arc-shaped first protrusions 2014, so as to form a wavy surface at the end surface of the first body 201 along the third direction.

[0094] Referring to Figures 12 to 16 (some reference signs are used in the Figures 1 to 3 , the Figures 17 to 22The battery box 100 provided by the embodiment of the present application comprises a box body 1, wherein a containing cavity is arranged in the box body 1, and the battery box 100 further comprises the partition plate 2 provided by the embodiment of the present application, the partition plate 2 is arranged in the box body 1 and separates the containing cavity into the first chamber 103 and the second chamber 104 which are independent from each other, the first flow guide assembly 202, the second flow guide assembly 203 and the baffle plate 205 on the partition plate 2 are all located in the first chamber 103, the liquid inlet 101 is communicated with the second chamber 104, the battery cell 211 is fixed in the mounting hole 2012 of the first body 201, one end of the battery cell 211 extends into the first chamber 103, and the other end of the battery cell 211 extends into the second chamber 104, the liquid inlet 101 sends the cooling liquid into the second chamber 104, the cooling liquid flows from the one end of the second chamber 104 close to the first flow guide assembly 202 on the partition plate 2 to the one end of the second chamber 104 close to the backflow hole 2011, immerses the battery cell 211 to exchange heat, and then enters the first chamber 103 through the backflow hole 2011, the cooling liquid is guided to the second flow guide groove 2031 of each second flow guide assembly 203 under the guidance of the baffle plate flow guide surface 2051 of the baffle plate 205, and then is collected in the liquid outlet area 2013 after passing through the flow guide gap 220 of the battery module 200 and the first flow guide groove 2021, and finally is discharged through the liquid outlet 102.

[0095] The battery box 100 is separated into the first chamber 103 and the second chamber 104 by the partition plate 2, and the battery cell 211 is effectively exchanged heat under the joint action of the first flow guide assembly 202, the second flow guide assembly 203, the baffle plate 205 and the backflow hole 2011 on the partition plate 2, so that the local battery cell 211 is prevented from aging due to uneven heat dissipation, and the service life of the entire battery module 200 is prolonged.

[0096] In addition, the battery cell 211 is fixed and sealed by the sealing glue when being mounted in the mounting hole 2012, so that the displacement of the battery cell 211 on the partition plate 2 is avoided, and the cooling liquid in the upper region of the partition plate 2 (i.e. the cooling liquid in the first chamber 103) is prevented from entering the lower region of the partition plate 2 (i.e. the second chamber 104) through the gap between the battery cell 211 and the hole wall of the mounting hole 2012, so that the mixing of the cooling liquid is effectively prevented.

[0097] In other embodiments, the first direction is not limited to the vertical direction, but can also be set as the horizontal direction, that is, when the battery box 100 is vertically placed, the first direction is the horizontal direction, and the second direction is not limited to the length direction of the battery box 100, and the third direction is not limited to the width direction of the battery box 100, but the second direction can be set as the width direction of the battery box 100, and the third direction can be set as the length direction of the battery box 100, and the specific direction is not described herein.

[0098] Refer toFigures 17 to 22 This invention also provides a battery pack, including a battery housing 100 and a battery module 200. The battery housing 100 has a receiving cavity, and the battery module 200 is disposed within the receiving cavity. The specific structure of the battery housing 100 will not be described in detail here.

[0099] like Figures 6 to 8 As shown (see attached) Figures 15 to 17 , Figure 19 and Figure 22 This invention provides a tray 3, which is applied to a battery box 100. In this embodiment, the first direction is the vertical direction, the second direction is the length direction of the battery box 100, which is the length direction of the tray 3, and the third direction is the width direction of the battery box 100, which is the width direction of the tray 3.

[0100] In this embodiment, the tray 3 includes a second body 301, a third flow guiding assembly 302, and a flow guiding plate 303. The second body 301 has a liquid inlet area 3011, which is configured as a liquid inlet 101 communicating with the battery housing 100. The liquid inlet area 3011 is located on the upper side of the second body 301 along the first direction. The third flow guiding assembly 302 is also located on the upper side of the second body 301 along the first direction. The third flow guiding assembly 302 includes multiple third flow guiding channels 3021. One end of the flow channel 3021 is connected to the liquid inlet area 3011, and the other end is connected to the area where the battery module 200 is located. The third flow guide component 302 is configured to disperse and guide the coolant in the liquid inlet area 3011 to the battery module 200. The flow guide plate 303 is also located on the upper side of the second body 301 along the first direction. The flow guide plate 303 and the third flow guide component 302 are respectively adjacent to the two ends of the second body 301 along the second direction. The flow guide plate 303 is provided with a flow guide surface 3031 on the side near the third flow guide component 302.

[0101] In this embodiment, the tray 3 is equipped with a liquid inlet area 3011 and a third flow guiding component 302. The liquid inlet area 3011 is configured to receive coolant from the liquid inlet 101 of the battery housing 100. The third flow guiding component 302 disperses the coolant in the liquid inlet area 3011 and guides it to the battery module 200, so that the battery module 200 can be more evenly immersed in coolant for heat exchange and heat dissipation, thereby improving the heat dissipation effect of the battery module 200. The flow guiding plate 303 is provided so that the coolant after heat exchange with the battery module 200 can be guided to other areas for heat exchange or to the outside of the battery housing 100, ensuring that heat exchange in other areas can proceed smoothly and reducing the probability of coolant flowing back to the battery module 200 that has already been heat-exchanged.

[0102] In the embodiment, the flow guide surface 3031 is an arc surface recessed towards the side away from the third flow guide assembly 302. By setting the flow guide surface 3031 as an arc surface recessed inward, the resistance of the cooling liquid at the flow guide surface 3031 can be reduced, so that the cooling liquid can be quickly guided to other areas for heat exchange or guided to the outside of the battery box 100. Of course, the flow guide surface 3031 is not limited to an arc surface recessed inward, but can also be an inclined surface. In an embodiment, the flow guide surface 3031 is inclined from the end close to the second body 301 towards the end away from the second body 301 and towards the side away from the third flow guide assembly 302, i.e. the flow guide surface 3031 is inclined from bottom to top towards the side away from the third flow guide assembly 302. The inclined flow guide surface 3031 can also reduce the resistance of the cooling liquid.

[0103] In an embodiment, the battery module 200 has a plurality of rows of cell groups 210 arranged along the third direction, each row of cell groups 210 includes a plurality of cells 211 arranged along the second direction, at least a flow guide gap 220 is formed between adjacent two rows of cell groups 210, and a plurality of third flow guide grooves 3021 correspond to the plurality of flow guide gaps 220 one by one. By corresponding the flow guide gap 220 between the cell groups 210 and the third flow guide groove 3021 one by one, when the cooling liquid enters the external cooling area 3011, the cooling liquid can be divided by the third flow guide groove 3021, and the flow guide gap 220 corresponding to the position of the third flow guide groove 3021 can receive the divided cooling liquid, increasing the opportunity for each cell 211 of each row of cell groups 210 to contact the cooling liquid, and the temperature of the cooling liquid after heat exchange is also relatively uniform. The cooling liquid after heat exchange is guided to other areas for heat exchange or guided to the outside of the battery box 100 through the flow guide surface 3031, reducing the backflow or mixing of the cooling liquid after heat exchange of the adjacent two rows of cell groups 210 to other rows of cell groups 210, thereby avoiding the situation that the local heat exchange efficiency of the cells 211 is low.

[0104] In an embodiment, the two end surfaces of the second body 301 along the third direction are spaced apart from the outer side wall of the battery module 200, so that the flow guide gap 220 is also formed on both sides of the battery module 200 along the third direction. In an embodiment, during installation, the two sides of the battery module 200 along the third direction do not directly abut against the inner side wall of the battery box 100, because it is necessary to avoid the situation that the cells 211 cannot be immersed in the cooling liquid and thus cannot dissipate heat well. The flow guide gap 220 formed on both sides of the battery module 200 along the third direction also corresponds to the third flow guide groove 3021, and the cooling liquid entering the external cooling area 3011 can also enter the flow guide gap 220 on both sides of the battery module 200 along the third direction through the third flow guide groove 3021 at this position, so that each cell 211 can be immersed in the cooling liquid for heat exchange and dissipation, thereby ensuring that all cells 211 can be uniformly heat exchanged.

[0105] In one embodiment, the third flow guiding assembly 302 includes a plurality of spaced-apart third flow guiding plates 3022, with a third flow guiding groove 3021 formed between two adjacent third flow guiding plates 3022. One end of each third flow guiding plate 3022 extends to the liquid inlet area 3011, and the other end extends to the area adjacent to the battery module 200. The protruding third flow guiding plates 3022 can reduce the overall thickness of the second body 301, reduce the space occupied by the entire tray 3 within the battery housing 100, and improve the energy density of the entire battery pack.

[0106] In one embodiment, the third guide vane 3022 and the second body 301 are integrally injection molded from plastic. This integral injection molding method reduces the difficulty of installing and manufacturing the third guide vane 3022, reduces the number of parts, and lowers costs. Alternatively, the third guide vane 3022 can be manufactured separately and then fixed to the second body 301 by bonding, welding, screw connection, snap-fitting, or other methods.

[0107] In other embodiments, a separate third guide plate 3022 may not be provided. Instead, the thickness of the second body 301 may be increased, and a groove may be cut into the second body 301 to form a third guide groove 3021. This design requires the battery cell 211 to be at least partially embedded in the second body 301 so that the third guide groove 3021 can effectively disperse and guide the coolant.

[0108] In one embodiment, such as Figure 9 As shown (see attached) Figures 6 to 8 Appendix Figures 15 to 17 , Figure 19 and Figure 22 The width of the third guide plate 3022 near the liquid inlet area 3011 is L5, and the width of the third guide plate 3022 near the cell 211 is L6, where L5 is smaller than L6. By widening the width of the portion of the third guide plate 3022 near the cell 211, the amount of coolant entering other areas within the guide gap 220 can be minimized. Conversely, the width of the end of the third guide plate 3022 near the liquid inlet area 3011 is reduced to create a converging effect. Since the size of the liquid inlet area 3011 is generally designed to be smaller than the width of the battery module 200 (i.e., the dimension of the battery module 200 along a third direction), the third guide assembly 302 needs to be tightened to facilitate the smooth flow of coolant from the liquid inlet area 3011 into all the third guide channels 3021.

[0109] The end face of the third flow guide plate 3022 adjacent to one end of the battery cell 211 matches the shape of the battery cell 211. This design is to make the third flow guide plate 3022 more conform to the shape of the battery cell 211, form a better flow guide effect, and make the cooling liquid in the third flow guide groove 3021 enter the flow guide gap 220 with smaller resistance. In this embodiment, the battery cell 211 is a cylindrical battery cell, and the end face of the third flow guide plate 3022 adjacent to one end of the battery cell 211 is an arc face. Of course, the battery cell 211 is not limited to be cylindrical, but can also be square, polygonal or special-shaped, and at this time, the shape of the end face of the third flow guide plate 3022 adjacent to one end of the battery cell 211 is adjusted according to the shape of the battery cell 211.

[0110] In addition, the end face of the third flow guide plate 3022 adjacent to one end of the battery cell 211 is spaced from the outer side wall of the battery cell 211, which can avoid the third flow guide plate 3022 directly abutting against the outer side wall of the battery cell 211, thereby preventing the third flow guide plate 3022 from shielding the battery cell 211, so that the battery cell 211 can contact and exchange heat with the cooling liquid as much as possible.

[0111] In an embodiment, the second body 301 is provided with a flow dividing member 304 protruding therefrom, and the flow dividing member 304 is located in the liquid inlet area 3011. By arranging the flow dividing member 304, the cooling liquid delivered by the liquid inlet 101 can be divided, and the cooling liquid is prevented from locally accelerating and flowing to a certain third flow guide groove 3021. The flow dividing member 304 first divides the cooling liquid, and then the divided cooling liquid can be uniformly delivered to each third flow guide groove 3021, thereby ensuring that each flow guide gap 220 can obtain cooling liquid with the same temperature and substantially consistent flow, ensuring that the cooling effects of the battery cells 211 are the same, reducing the temperature difference of the battery cells 211, and prolonging the service life of the entire battery module 200.

[0112] In this embodiment, the outer side wall of the flow dividing member 304 is at least partially arc-shaped, and the cross-sectional dimension of the end of the flow dividing member 304 away from the second body 301 is smaller than the cross-sectional dimension of the end of the flow dividing member 304 connected to the second body 301. By arranging the arc-shaped outer side wall of the flow dividing member 304, the splashing of the cooling liquid delivered by the liquid inlet 101 at the flow dividing member 304 can be reduced, and the cooling liquid can be ensured to adhere to the outer side wall of the flow dividing member 304 for division. The structure of the upper end being smaller than the lower end can form a better flow dividing effect, and the lower end of the flow dividing member 304 forms a dispersed structure to ensure that the cooling liquid can be uniformly divided.

[0113] In an embodiment, as shown in FIG. 8 (see FIGS. 8A and 8B), the flow dividing member 304 is provided with a plurality of flow dividing grooves 3041. Figure 24 Figure 1 Figure 22 ​​), two third guide plates 3022 located at the outermost along the third direction are third outer guide plates 30221, the ends of the two third outer guide plates 30221 away from the battery cell 211 are connected, the rest of the third guide plates 3022 are third inner guide plates 30222, the end of the third inner guide plate 30222 away from the battery cell 211 is spaced from the inner side wall of the third outer guide plate 30221 to form a liquid inlet area 3011, the flow distribution piece 304 includes a flow distribution outer peripheral surface 3042, a flow distribution bottom surface 3043 and a flow distribution top surface 3041, the flow distribution top surface 3041 and the flow distribution bottom surface 3043 are spaced along the first direction, the flow distribution outer peripheral surface 3042 connects the flow distribution top surface 3041 and the flow distribution bottom surface 3043, the flow distribution bottom surface 3043 is connected to the second body 301, the size of the flow distribution top surface 3041 is smaller than the size of the flow distribution bottom surface 3043, the flow distribution outer peripheral surface 3042 includes a connecting surface 30421 and a flow distribution guide surface 30422 connected to each other along the peripheral portion of the flow distribution piece 304, the connecting surface 30421 is connected to the inner side surface of the third outer guide plate 30221, the flow distribution guide surface 30422 is a tapered surface, and the flow distribution guide surface 30422 faces the third inner guide plate 30222. The structure of the flow distribution piece 304 is actually half of a cone cut along the central axis of the cone. By setting the flow distribution outer peripheral surface 3042 of the flow distribution piece 304 as a structure connected by the connecting surface 30421 and the flow distribution 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), and the flow distribution guide surface 30422 of the tapered surface structure is exposed to the flow distribution piece 304. The tapered surface structure distributes the cooling liquid from top to bottom, and reduces the resistance and splashing of the cooling liquid as much as possible, so that the cooling liquid is gradually dispersed from the flow distribution top surface 3041 with a smaller size to the flow distribution bottom surface 3043 with a larger size along the tapered surface structure, and then enters the third guide groove 3021. At this time, the cooling liquid is distributed more evenly in each third guide groove 3021.

[0114] In an embodiment, a plurality of mounting grooves 3012 for clamping the battery cell 211 are formed on the second body 301. By providing the mounting grooves 3012, the lower end of the battery cell 211 can be fixed to the tray 3, the difficulty of fixing the battery cell 211 is reduced, and displacement of the battery cell 211 is avoided. In an embodiment, the battery cell 211 is bonded to the mounting groove 3012 by sealing glue.

[0115] The bottom of the installation groove 3012 is provided with a first pressure relief hole 3013 penetrating the second body 301. When the battery cell 211 fails, the electrolyte and other substances discharged from the first pressure relief hole 3013 can be discharged to the bottom of the tray 3, that is, the side of the tray 3 away from the cooling liquid, thereby avoiding pollution of the cooling liquid by the electrolyte and other substances, and avoiding the influence of the failed battery cell 211 on the adjacent remaining battery cells 211. In this embodiment, since the battery cell 211 is bonded to the installation groove 3012 by sealing glue, the sealing glue bonding position also plays a sealing role to prevent the cooling liquid from leaking from the upper area of the tray 3 to the lower area of the tray 3.

[0116] In an embodiment, the second body 301 is provided with a second groove group at each end in the third direction, and each group of second groove groups includes a plurality of second grooves 3014 spaced apart in the second direction, and the second grooves 3014 are recessed towards the area between the adjacent two installation grooves 3012. By providing the second grooves 3014, the space at the two ends of the second body 301 in the third direction can be reduced. When the sizes of the battery cells 211 are the same, the widths of the flow guide gaps 220 between the adjacent battery cell groups 210 are consistent. If the flow guide gaps 220 on the two sides of the battery module 200 in the third direction are not provided with the second grooves 3014, the widths of the flow guide gaps 220 will be inconsistent, which will cause the cooling effect of the battery cells 211 on the two sides of the battery module 200 to be inconsistent with the cooling effect of the battery cells 211 in the middle. In an embodiment, the second grooves 3014 are arc-shaped grooves, and adjacent two second grooves 3014 are connected by an arc-shaped second protrusion 3016 to form a wavy surface at the end face of the second body 301 in the third direction.

[0117] In an embodiment, the periphery of the second body 301 is annularly protruded with a connecting protrusion 305, and the connecting protrusion 305 is located on the same side of the second body 301 as the third flow guide assembly 302, that is, the connecting protrusion 305 protrudes from the upper side of the second body 301, and a clamping groove 3051 for clamping the battery box body 1 is recessed on the connecting protrusion 305. By providing the connecting protrusion 305 and the clamping groove 3051, the tray 3 and the battery box body 1 can be manufactured separately and then connected by assembly, which can reduce the manufacturing difficulty. During assembly, sealing glue can be provided in the clamping groove 3051, and the lower end of the battery box body 1 is inserted into the clamping groove 3051 and fixed by the sealing glue. After bonding, the battery box body 1 and the tray 3 are also sealed by the sealing glue, which can prevent the cooling liquid from leaking.

[0118] In other embodiments, the connecting protrusion 305 and the clamping groove 3051 are not limited to connecting the battery box body 1, for example, Figure 10 and11 As shown, the tray 3 can also be directly welded with the box body 1, or the tray 3 and the box body 1 are integrally injection molded or integrally cast formed, etc.

[0119] Referring to Figures 12 to 16 (portion of the figure mark follows the Figures 6 to 8 , attached Figures 17 to 22 )The embodiment of the present application also provides a battery box 100, the battery box 100 includes a box body 1, the box body 1 is provided with a containing cavity, the battery box 100 also includes the tray 3 provided by the embodiment of the present application, the lower end of the box body 1 is provided with an opening 1014, and the tray 3 blocks the opening 1014, the liquid inlet area 3011, the third flow guide assembly 302, the drainage plate 303 and the flow divider 304 on the tray 3 are all arranged in the containing cavity, and the box body 1 is also provided with a liquid inlet 101 and a liquid outlet 102, both the liquid inlet 101 and the liquid outlet 102 communicate with the containing cavity, and the liquid inlet 101 is arranged opposite the flow divider 304 of the tray 3. After the cooling liquid enters the box body 1 of the battery box 100 from the liquid inlet 101, it is first divided by the flow divider 304, and then divided by the plurality of third flow grooves 3021, the cooling liquid entering the third flow grooves 3021 is collected at the drainage plate 303 after entering the flow gap 220 of the battery module 200, and finally is drained to other areas of the box body 1 through the drainage surface 3031 or directly discharged through the liquid outlet 102.

[0120] The battery box 100 can effectively exchange heat and dissipate heat for each cell 211 of the battery module 200 through the division, flow guide and drainage of the tray 3, avoid the local cell 211 from aging due to uneven heat dissipation, and prolong the service life of the entire battery module 200.

[0121] In other embodiments, the first direction is not limited to the vertical direction, and can also be set as the horizontal direction, that is, when the battery box 100 is placed vertically, the first direction is the horizontal direction, and the second direction is not limited to the length direction of the battery box 100, and the third direction is not limited to the width direction of the battery box 100, and the second direction can also be set as the width direction of the battery box 100, and the third direction can also be set as the length direction of the battery box 100, and the specific direction is not described again.

[0122] Referring to Figures 17 to 22 , the embodiment of the present application also provides a battery pack, which includes a battery box 100 and a battery module 200, the battery box 100 is provided with a containing cavity, and the battery module 200 is arranged in the containing cavity. The specific structure of the battery box 100 is not described again.

[0123] As Figures 12 to 16 shown (referring to attached Figures 1 to 3 , attachedFigures 6 to 8 and the accompanying drawings, which are incorporated herein by reference in their entirety, and wherein: Figures 17 to 22 In the embodiments of the present application, the first direction is the vertical direction, the second direction is the length direction of the battery box 100, and the third direction is the width direction of the battery box 100.

[0124] The battery cell 211 installed in the battery box 100 is taken as a cylindrical battery cell 211 for example, and the battery cell 211 is not limited to be a cylindrical battery cell 211, but can also be a square, polygonal or irregular shape. The specific structure of the battery cell 211 is not limited, and the part of the structure of the battery box 100 is adjusted adaptively according to the shape of the battery cell 211, which will not be described here.

[0125] In the embodiments of the present application, the battery box 100 includes a box body 1 and a partition plate 2. The box body 1 is provided with a liquid inlet 101 and a liquid outlet 102 at intervals, and is provided with an accommodation cavity for accommodating the battery module 200. The partition plate 2 is arranged in the accommodation cavity, and divides the accommodation cavity into a first chamber 103 and a second chamber 104 distributed along the first direction. The first chamber 103 is located above the second chamber 104. The partition plate 2 is provided with a plurality of mounting holes 2012 for mounting the battery cell 211 of the battery module 200. The two ends of the battery cell 211 extend into the first chamber 103 and the second chamber 104, respectively. The partition plate 2 is provided with a backflow hole 2011. The partition plate 2 has a liquid outlet area 2013 communicating with the liquid outlet 102. The liquid outlet area 2013 is located in the first chamber 103. The liquid outlet area 2013 and the backflow hole 2011 are adjacent to the two ends of the partition plate 2 along the second direction, respectively. The liquid outlet 102 communicates with the liquid outlet area 2013. The second chamber 104 has a liquid inlet area 3011. The liquid inlet area 3011 and the liquid outlet area 2013 are located at the same end of the box body 1 along the second direction. The liquid inlet 101 communicates with the liquid inlet area 3011. The first direction and the second direction are arranged at an angle.

[0126] The battery box 100 of the embodiment of the present application utilizes the partition plate 2 to separate the containing cavity in the box body 1 into independent first chamber 103 and second chamber 104, after the partition plate 2 is installed with the battery cell 211, the two chambers are relatively sealed, the cooling liquid enters the liquid inlet area 3011 of the second chamber 104 from the liquid inlet 101 first, then sequentially immerses the part of the battery cell 211 in the second chamber 104 from one end close to the liquid inlet area 3011 to the end far from the liquid inlet area 3011 along the second direction, exchanges heat with the battery cell 211, then enters the first chamber 103 again through the backflow hole 2011 on the partition plate 2, sequentially immerses the part of the battery cell 211 in the first chamber 103 from the side where the backflow hole 2011 is located to the liquid outlet area 2013, exchanges heat with the remaining part of the battery cell 211, and the cooling liquid collected in the liquid outlet area 2013 is discharged through the liquid outlet 102, the whole process exchanges heat with the battery cell 211 of the battery module 200 in steps, the special immersion path (similar to the U-shaped immersion path, i.e. Figure 22 the path indicated by the arrow) of the cooling liquid increases the probability of each battery cell 211 contacting the cooling liquid, improves the uniformity and effect of heat exchange of all battery cells 211, and prolongs the service life of the battery cell 211.

[0127] In the embodiment, the battery module 200 has a plurality of rows of battery cell groups 210 arranged along the third direction, each row of battery cell groups 210 includes a plurality of battery cells 211 arranged along the second direction, and adjacent two rows of battery cell groups 210 are arranged in staggered manner. This design can make the battery module 200 more closely arranged, ensure that the space utilization rate in the battery box 100 is higher, and the energy density of the battery pack formed after the battery module 200 is assembled will be larger.

[0128] The battery box 100 can be provided with only the partition plate 2, and the specific structure of the partition plate 2 is as described in the embodiment of the present application, and the specific structure of the partition plate 2 will not be described here.

[0129] The battery box 100 can be provided with both the partition plate 2 and the tray 3, in an embodiment, the tray 3 is connected with the box body 1, the tray 3 is spaced from the partition plate 2, and the second chamber 104 is formed between the tray 3 and the partition plate 2, that is, the tray 3 is installed at the bottom of the second chamber 104, the specific structure of the partition plate 2 is as described in the embodiment of the present application, and the specific structure of the tray 3 is as described in the embodiment of the present application, and the specific structures of the partition plate 2 and the tray 3 will not be described here.

[0130] The following will be described taking the battery box 100 provided with both the partition plate 2 and the tray 3 as an example.

[0131] The partition plate 2 is fixed to the middle part of the battery cell 211 along the first direction (i.e. the middle part in the vertical direction), at this time, the lengths of the battery cell 211 in the first chamber 103 and the second chamber 104 are consistent.

[0132] In the embodiment, the height of the second chamber 104 along the first direction is H1, the liquid level of the cooling liquid in the accommodating cavity along the first direction is H2, and the size of the battery cell 211 along the first direction is H3. The relationship of H1, H2 and H3 can satisfy 2:5:5 or 1:4:4. The relationship is designed to be that the height of the second chamber 104 is lower than the height of the first chamber 103, which is beneficial to accelerate the flow rate of the cooling liquid in the second chamber 104, and in turn accelerate the cooling liquid flowing to the first chamber 103 to cool the battery cell 211, and improve the overall heat exchange efficiency of the battery cell 211. In other embodiments, the height of the second chamber 104 is not limited to be set to be lower than the height of the first chamber 103, but can also be set to be consistent with the height of the first chamber 103, that is, the partition plate 2 is located at the middle of the box body 1 along the first direction, so that the height of the first chamber 103 and the height of the second chamber 104 are consistent.

[0133] The liquid inlet 101 and the liquid outlet 102 are located on the same side of the box body 1 along the first direction and close to the first chamber 103, and the liquid inlet 101 and the liquid outlet 102 are adjacent to one end where the liquid outlet area 2013 is located. By setting the liquid inlet 101 and the liquid outlet 102 on the same side of the box body 1 along the first direction, that is, on the upper side or the lower side of the battery box 100, the liquid inlet 101 and the liquid outlet 102 are avoided to occupy the space in the horizontal direction of the battery box 100, the battery box 100 is arranged more closely, and the space utilization is increased. By setting the liquid inlet 101 and the liquid outlet 102 on the end adjacent to the liquid outlet area 2013, the length of the pipe arranged in the battery box 100 can be shortened, the cost is saved, and the space utilization in the battery box 100 is reduced. In an embodiment, the liquid inlet 101 and the liquid outlet 102 are located on the upper side of the battery box 100. This design can make the liquid flow downward into the second chamber 104 located below when the liquid is filled, and then the cooling liquid in the second chamber 104 is immersed into the first chamber 103 through the backflow hole 2011 after the cooling liquid fills the entire second chamber 104.

[0134] In other embodiments, the liquid inlet 101 and the liquid outlet 102 are not limited to be arranged on the same side of the box body 1, but can also be arranged on different sides, for example, the liquid inlet 101 is arranged on the lower side of the battery box 100, and the liquid outlet 102 is arranged on the upper side of the battery box 100, or the liquid inlet 101 and the liquid outlet 102 are arranged on the left and right sides or the front and back sides of the battery box 100.

[0135] In an embodiment, the battery box 100 further comprises a first sealing plate 4 and a second sealing plate 5, and the box body 1 is provided with an opening 1014 at both ends in the first direction, wherein the lower end of the box body 1 in the first direction is sealed by the tray 3, and the side of the tray 3 away from the partition plate 2 is recessed to provide a pressure relief groove 3015, the tray is provided with a plurality of mounting grooves for clamping the battery cell, the bottom of the mounting groove is provided with a first pressure relief hole 3013 (i.e. the tray 3 is provided with a first pressure relief hole 3013 corresponding to each battery cell 211), the first pressure relief hole 3013 is in communication with the pressure relief groove 3015, and the side of the tray away from the partition plate is connected with the first sealing plate 4, the first sealing plate 4 seals the opening of the pressure relief groove 3015, and the opening 1014 at the upper end of the box body 1 in the first direction is sealed by the second sealing plate 5 to form a sealed battery box 100. By providing the pressure relief groove 3015, the first pressure relief hole 3013 of the tray 3 can be communicated, and the first pressure relief hole 3013 is in position correspondence with the battery cell 211. When the battery cell 211 fails and needs to be relieved, the electrolyte and other substances sprayed from the battery cell 211 can enter the pressure relief groove 3015 through the first pressure relief hole 3013, and the first sealing plate 4 is provided to avoid the pressure relief groove 3015 being exposed, so as to ensure that the pressure relief groove 3015 can store and seal the electrolyte and other substances sprayed from the battery cell 211, thereby preventing mutual influence between adjacent battery boxes 100 and environmental pollution; by providing the opening 1014 and the second sealing plate 5, the installation of the partition plate 2, the battery module 200 and other components is facilitated, and the components in the battery box 100 are also convenient for later maintenance.

[0136] In an embodiment, the bottom of the pressure relief groove 3015 is provided with a plurality of supports 306, the supports 306 are located between adjacent first pressure relief holes 3013, and the end of the support 306 away from the bottom of the pressure relief groove 3015 abuts against the inner side of the first sealing plate 4. By providing the support 306, the first sealing plate 4 can be supported by the support 306 to avoid deformation of the first sealing plate 4.

[0137] The upper end of the box body 1 along the first direction is provided with an opening 1014 communicating with the accommodating cavity, and the end of the box body extends towards the middle of the opening 1014 to form a mounting portion 1010, and the second sealing plate 5 is connected with the mounting portion 1010 to seal the opening 1014. By arranging the mounting portion 1010, a position for mounting the second sealing plate 5 can be formed on the upper side of the box body 1. In an embodiment, a sealing groove 1011 is annularly arranged around the opening 1014 on the mounting portion 1010, and sealing glue is arranged in the sealing groove 1011, and the second sealing plate 5 is connected with the mounting portion 1010 through the sealing glue. In an embodiment, a step 1012 is annularly arranged on the inner side wall of the mounting portion 1010, the step 1012 is spaced from the side of the mounting portion 1010 away from the accommodating cavity (i.e. the step 1012 is recessed, and the upper side of the step 1012 is spaced from the upper side of the mounting portion 1010), the second sealing plate 5 abuts against the step 1012, and the sealing groove 1011 is arranged on the step 1012. By arranging the step 1012, the mounting position of the second sealing plate 5 can be limited, so that the second sealing plate 5 can accurately seal the opening 1014, and the displacement of the second sealing plate 5 can also be effectively prevented. In addition to the bonding method for fixing the second sealing plate 5, the second sealing plate 5 can also be fixed by the screw combined with the sealing ring, or the second sealing plate 5 can also be fixed by the clamping structure combined with the sealing ring. The detachable connection facilitates the disassembly of the second sealing plate 5, and further facilitates the installation and maintenance of the battery module 200 in the battery box 100.

[0138] In the present embodiment, the liquid inlet 101 and the liquid outlet 102 are arranged on the mounting portion 1010, and the liquid inlet connector 6 is arranged on the mounting portion 1010 corresponding to the liquid inlet 101, and the liquid outlet connector 7 is arranged on the mounting portion 1010 corresponding to the liquid outlet 102, and the liquid inlet connector 6 and the liquid outlet connector 7 are used to connect external pipelines to realize the circulation cooling of the cooling liquid. Moreover, the liquid inlet 101 and the liquid outlet 102 are arranged on the mounting portion 1010, which can avoid the obstruction and pulling of the pipelines when the second sealing plate 5 is disassembled. The liquid inlet connector 6 and the liquid outlet connector 7 can adopt a quick disassembly connector to realize the quick disassembly of the pipelines. In other embodiments, the liquid inlet 101 and the liquid outlet 102 can also be arranged on the second sealing plate 5, or the liquid inlet 101 and the liquid outlet 102 can be arranged on the mounting portion 1010 and the second sealing plate 5 respectively.

[0139] In addition, the liquid inlet 101 is communicated with the second chamber 104 through a liquid inlet pipe 204, the liquid inlet pipe 204 is arranged in the first chamber 103, the through hole 2017 communicated with the liquid inlet pipe 204 is arranged on the partition plate 2, and the through hole 2017 penetrates the partition plate 2. In order to facilitate maintenance and avoid leakage, the liquid inlet pipe 204 can be directly fixed with the partition plate 2. In other embodiments, the liquid inlet pipe 204 can be separately arranged, and after the partition plate 2 is installed, the two ends of the liquid inlet pipe 204 are respectively abutted against the mounting portion 1010 and the partition plate 2. In addition, the liquid inlet pipe 204 can also directly penetrate the through hole 2017, that is, a part of the liquid inlet pipe 204 is located in the first chamber 103 and abutted against the position of the liquid inlet 101 corresponding to the mounting portion 1010, and the other part extends into the second chamber 104. At this time, the outer side wall of the liquid inlet pipe 204 and the hole wall of the through hole 2017 need to be sealed to prevent the cooling liquid in the first chamber 103 from entering the second chamber 104 through the gap between the outer side wall of the liquid inlet pipe 204 and the hole wall of the through hole 2017.

[0140] In an embodiment, the box body 1 has a first side plate 105 and a second side plate 106 distributed along the third direction, the inner side surfaces of the first side plate 105 and the second side plate 106 are respectively provided with a plurality of third grooves 107 spaced along the second direction, the shape of the third grooves 107 matches the shape of the outer side wall of the battery cell 211 along the outer side of the battery module 200, and the outer side wall of the battery cell 211 is spaced from the groove wall of the third groove 107, and the protruding structure 108 is formed between the adjacent two third grooves 107 and is inserted into the region between the adjacent two battery cells 211 along the second direction, and the protruding structure 108 is spaced from the outer side wall of the battery cell 211. The two end surfaces of the partition plate 2 along the third direction are respectively abutted against and sealed with the inner side walls of the first side plate 105 and the second side plate 106, and therefore the shape of the two end surfaces of the partition plate 2 along the third direction matches the shape of the first side plate 105 and the second side plate 106. In an embodiment, the end surface of the partition plate 2 along the third direction is provided with a first protrusion 2014 corresponding to the third groove 107, and the end surface of the partition plate 2 along the third direction is provided with a first groove 2016 corresponding to the protruding structure 108, the outer side wall of the first protrusion 2014 is abutted against the groove wall of the third groove 107, the outer side wall of the protruding structure 108 is abutted against the groove wall of the first groove 2016, and a structure of abutment is formed to ensure the sealing of the connection position of the partition plate 2 and the first side plate 105 and the second side plate 106 of the box body 1.

[0141] The first side plate 105 and the second side plate 106 are corrugated plates, and the groove structure 109 is formed on the outer side surfaces of the first side plate 105 and the second side plate 106 corresponding to the protruding structure 108, and the two end surfaces of the partition plate 2 along the third direction form corrugated surfaces. By arranging the first side plate 105 and the second side plate 106 as corrugated plates, the space of the battery box 100 in the third direction can be saved.

[0142] In order to facilitate the assembly of the battery cell 211, in addition to the restriction of the partition plate 2, a mounting groove 3012 can also be arranged on the tray 3, the number and layout of the mounting groove 3012 are arranged according to the number and layout of the battery cell 211 of the battery module 200, the lower end of the battery cell 211 is inserted into the mounting groove 3012, and the first pressure relief hole 3013 is arranged at the groove bottom of the mounting groove 3012 and penetrates the second body 301 of the tray 3 in the first direction (i.e., penetrates the thickness direction of the second body 301). In order to avoid the leakage of the cooling liquid from the outer wall of the battery cell 211 and the groove wall of the mounting groove 3012 to the side of the tray 3 away from the second cavity 104 (i.e., to avoid the leakage of the cooling liquid to the outside bottom of the tray 3) after the assembly of the battery cell 211 and the tray 3, therefore, a sealing glue is arranged between the groove wall of the mounting groove 3012 and the outer wall of the battery cell 211.

[0143] The second pressure relief hole 1013 is arranged on the box body 1, and the second pressure relief hole 1013 communicates the pressure relief groove 3015 and the outside of the box body 1. By arranging the second pressure relief hole 1013, the electrolyte and other substances generated by the pressure relief of the battery cell 211 can be discharged to the outside of the box body 1. In an embodiment, the second pressure relief hole 1013 is arranged on one side of the box body 1 in the second direction. In other embodiments, the second pressure relief hole 1013 is not limited to being arranged on the side of the box body 1 in the second direction, but can also be arranged on the side of the box body 1 in the third direction (i.e., on the first side plate 105 and / or the second side plate 106).

[0144] In an embodiment, the projection of the backflow hole 2011 on the partition plate 2 in the first direction at least partially overlaps the drainage surface 3031 of the drainage plate 303 of the tray 3. This design can make the cooling liquid drained upward by the drainage surface 3031 pass through the backflow hole 2011 into the first cavity 103 as quickly as possible, reduce the residence time of the cooling liquid in the second cavity 104, and accelerate the circulation of the cooling liquid. In an embodiment, the projection of the backflow hole 2011 in the first direction fully overlaps the drainage surface 3031.

[0145] In an embodiment, the tray 3 is fixedly connected with the box body 1. The fixed connection can reduce the assembly difficulty and avoid the leakage of the cooling liquid at the connection position of the tray 3 and the box body 1. In an embodiment, the tray 3 and the box body 1 are formed by one-piece molding. The one-piece molding is simple to operate, has no joint gap, and has good leakage prevention effect. In an embodiment, the tray 3 and the box body 1 are formed by one-piece injection molding.

[0146] Of course, the tray 3 is not limited to be fixedly connected with the box body 1, but can be detachably connected with the box body 1. In an embodiment, the tray 3 is provided with a clamping groove 3051, the box body 1 is inserted into the clamping groove 3051 along one end in the first direction, and the clamping groove 3051 is provided with sealing glue, which bonds and seals the connection position of the box body 1 and the tray 3. The sealing glue is selected from a sealing glue, which can not only achieve connection and fixation, but also achieve good sealing. In an embodiment, the upper surface of the tray 3 is annularly provided with a ring of connecting protrusions 305, and the clamping groove 3051 is formed on the connecting protrusions 305.

[0147] As Figures 17 to 22 (portion of the reference signs is used in the Figures 1 to 3 , the Figures 6 to 8 , the Figures 12 to 16 Embodiments of the present application also provide a battery pack, comprising a battery module 200 and a battery box 100, and the battery module 200 is sealingly installed in the battery box 100, wherein the battery box 100 is the battery box 100 provided by the embodiments of the present application.

[0148] In an embodiment, after the battery module 200 is installed in the battery box 100, the lower end of the battery cell 211 of the battery module 200 abuts against the tray 3 in the battery box 100, and the upper end of the battery cell 211 is spaced from the second sealing plate 5 to form a space for installing bus bars and the like, and the separator 2 is clamped at the middle part of the battery cell 211 in the length direction, i.e., the middle part of the battery cell 211 in the first direction, so that the length of the battery cell 211 in the first cavity 103 and the second cavity 104 is consistent, and the uniformity of heat dissipation is ensured.

[0149] Embodiments of the present application also provide a cooling method of the battery pack, comprising the following steps:

[0150] Step S100, providing cooling liquid, and making the cooling liquid enter the second cavity 104 from the liquid inlet 101 of the battery box 100, and immerse the part of the battery cell 211 located in the second cavity 104 from one end of the second cavity 104 provided with the liquid inlet area 3011 in the second direction to the end away from the liquid inlet area 3011;

[0151] Step S200, the cooling liquid in the second cavity 104 enters the first cavity 103 through the backflow hole 2011 on the separator 2, and immerses the part of the battery cell 211 located in the first cavity 103 from one end of the first cavity 103 provided with the backflow hole 2011 in the second direction to the end where the liquid outlet area 2013 is located;

[0152] Step S300, the cooling liquid is collected in the liquid outlet area 2013, and then is discharged through the liquid outlet 102.

[0153] In an embodiment, the step S100 comprises:

[0154] Step S110, the cooling liquid enters the battery box 100 from the liquid inlet 101, and enters the second chamber 104 through the liquid inlet pipe 204;

[0155] Step S120, the cooling liquid first contacts the flow divider 304 to achieve flow division, and the cooling liquid is evenly divided to each third flow guide groove 3021 of the third flow guide assembly 302;

[0156] Step S130, the cooling liquid in the third flow guide groove 3021 is transported to the corresponding flow guide gap 220 of the battery module 200, and exchanges heat with the lower half of each battery cell 211 on one side or both sides of the flow guide gap 220, and the transport direction of the cooling liquid is from one end of the second chamber 104 provided with the liquid inlet area 3011 to the end far away from the liquid inlet area 3011 along the second direction;

[0157] Step S200 includes:

[0158] S210, the cooling liquid exchanged by the flow guide gap 220 contacts the drainage surface 3031 of the drainage plate 303, and is guided to the backflow hole 2011 on the separator 2 through the drainage surface 3031;

[0159] S220, the cooling liquid is immersed in the first chamber 103 from the backflow hole 2011, and flows on the side of the baffle flow guide surface 2051 of the baffle plate 205 facing the liquid outlet area 2013;

[0160] S230, the cooling liquid is guided to the corresponding flow guide gap 220 through the second flow guide groove 2031 of the second flow guide assembly 203, and exchanges heat with the upper half of each battery cell 211 on one side or both sides of the flow guide gap 220;

[0161] S240, the cooling liquid in the flow guide gap 220 enters the first flow guide groove 2021 of the first flow guide assembly 202, and all the first flow guide grooves 2021 collect the cooling liquid to the liquid outlet area 2013.

[0162] In addition, after the cooling liquid is discharged to the battery box 100, an external refrigeration device can also be used to cool the cooling liquid, and the cooled cooling liquid is recirculated to the liquid inlet 101 to cool the battery module 200 in the battery box 100 again.

[0163] The partitions 2 and trays 3 within the battery housing 100 are not limited to being distributed vertically, but can also be distributed horizontally. That is, the first direction is horizontal, and the second direction is not limited to the length of the battery housing 100. The third direction is not limited to the width of the battery housing 100; the second direction can be set to the width of the battery housing 100, and the third direction can be set to the length of the battery housing 100. When the first direction is horizontal, the first chamber 103 and the second chamber 104 can be arranged horizontally or right-left-right.

[0164] The flow direction of the coolant is as follows Figure 22 As shown (in the direction of the arrow), after entering from the second chamber 104, the coolant is immersed from bottom to top to cool the portion of the battery cell 211 located in the second chamber 104. When the coolant reaches the top of the second chamber 104, it enters the first chamber 103 through the return hole 2011 and flows from the top to the bottom of the first chamber 103 to cool the portion of the battery cell 211 located in the first chamber 103. Finally, it is discharged from the outlet 102 at the bottom of the first chamber 103 to the outside of the battery case 100.

[0165] Of course, the first direction is not limited to the horizontal; it can also be at a certain angle to the horizontal direction. For the specific cooling path of the coolant, please refer to the previous example, which will not be repeated here.

Claims

1. A battery housing, characterized in that, include: The housing body has an inlet and an outlet spaced apart on it, and a cavity for accommodating the battery module is provided inside the housing body. A partition is disposed within the receiving cavity, dividing the receiving cavity into a first chamber and a second chamber distributed along a first direction. The partition has multiple mounting holes for mounting the battery cells of the battery module. The battery cells extend into the first chamber and the second chamber at both ends along the first direction, respectively. A reflux hole is provided on the partition. The partition has a liquid outlet area communicating with the liquid outlet, located within the first chamber. The liquid outlet area and the reflux hole are adjacent to both ends of the partition along a second direction, respectively. The liquid outlet communicates with the liquid outlet area. The second chamber has a liquid inlet area, with the liquid inlet area and the liquid outlet area adjacent to the same end of the housing body along the second direction, respectively. The liquid inlet communicates with the liquid inlet area. The first direction and the second direction are arranged at an angle. The partition includes: A first body has a reflux hole and a plurality of mounting holes extending through it along the first direction. The first body has a liquid outlet area formed on one side along the first direction, and the mounting holes are located between the liquid outlet area and the reflux hole. A first flow guiding component is located on the same side of the first body as the liquid outlet area. The first flow guiding component includes a plurality of first flow guiding channels. The first end of all the first flow guiding channels is connected to the liquid outlet area, and the second end of all the first flow guiding channels is connected to the area where the battery module is located. The first flow guiding component is configured to guide the coolant in the area where the battery module is located into the liquid outlet area. The first direction is vertical, and the first chamber is located above the second chamber.

2. The battery housing according to claim 1, characterized in that, The battery module has multiple rows of cell groups arranged along a third direction. Each row of cell groups includes multiple cells arranged along the second direction. The third direction is set at an angle to the first direction and the second direction, respectively. At least two adjacent rows of cell groups are formed with a flow guide gap. Multiple first flow guide grooves correspond one-to-one with multiple flow guide gaps.

3. The battery housing according to claim 2, characterized in that, Along the third direction, the two sides of the first body are respectively spaced from the hole wall of the mounting hole, so that the battery module forms the flow guiding gap on both sides along the third direction.

4. The battery housing according to claim 2, characterized in that, The first flow guiding component includes a plurality of spaced first flow guiding plates, with a first flow guiding groove formed between two adjacent first flow guiding plates. The first end of the first flow guiding plate extends to the liquid outlet area, and the second end of the first flow guiding plate extends to the area adjacent to the battery module.

5. The battery housing according to claim 4, characterized in that, The width of the first end of the first guide vane is L1, and the width of the second end of the first guide vane is L2, where L1 is less than L2; and / or, The end face shape of the second end of the first guide plate matches the shape of the battery cell; and / or, The end face of the second end of the first guide plate is spaced apart from the outer wall of the battery cell.

6. The battery housing according to claim 1, characterized in that, A collection trough is recessed on the first body and located in the liquid outlet area, and all the first guide troughs are respectively connected to the collection trough.

7. The battery housing according to claim 1, characterized in that, The first flow guiding component includes a plurality of spaced-apart first flow guiding plates, and a first flow guiding groove is formed between two adjacent first flow guiding plates; The two first guide plates located on the outermost side of the first guide assembly along a third direction are the first outer guide plates. The ends of the two first outer guide plates away from the battery cell are connected. The first guide plate other than the two first outer guide plates is the first inner guide plate. The end of the first inner guide plate near the first outer guide plate is spaced apart from the inner sidewall of the first outer guide plate to form the liquid outlet area.

8. The battery housing according to claim 1, characterized in that, An immersion hole is formed through the first body along the first direction. The immersion hole is located between adjacent mounting holes and is formed corresponding to the gap between adjacent battery cells. The size of the immersion hole is smaller than the size of the return hole.

9. The battery housing according to claim 8, characterized in that, The sum of the areas of all the immersion holes on the first body is S1, the area of ​​the first body is S2, and the ratio between S1 and S2 satisfies: 1:25000-3:50000; and / or, The area of ​​a single immersion orifice is S3, the area of ​​a single return orifice is S4, and the ratio of S3 to S4 satisfies: 2:25-1:8; and / or, The sum of the areas of all the immersion holes on the first body is S1, and the sum of the areas of all the return holes on the first body is S5. The ratio between S1 and S5 satisfies: 1:2-2:

3.

10. The battery housing according to claim 1, characterized in that, A second flow guiding component is provided on the first body. The second flow guiding component is adjacent to the return hole. The second flow guiding component and the first flow guiding component are located on the same side of the first body. The second flow guiding component includes a plurality of second flow guiding grooves. All the second flow guiding grooves are respectively connected to the return hole and the area where the battery module is located.

11. The battery housing according to claim 10, characterized in that, The battery module has multiple rows of cell groups arranged along a third direction. Each row of cell groups includes multiple cells arranged along the second direction. The third direction is set at an angle to the first direction and the second direction, respectively. At least two adjacent rows of cell groups are formed with a flow guide gap. Multiple second flow guide grooves correspond one-to-one with multiple flow guide gaps.

12. The battery housing according to claim 11, characterized in that, The second flow guiding assembly includes a plurality of spaced second flow guiding plates, a second flow guiding groove is formed between two adjacent second flow guiding plates, a first end of the second flow guiding plate extends to a region adjacent to the battery cell, and at least one return hole is arranged between two adjacent second flow guiding plates.

13. The battery housing according to claim 12, characterized in that, The width of the second guide plate at its second end away from the liquid outlet area is L3, and the width of the second guide plate at its first end adjacent to the liquid outlet area is L4, where L3 is less than L4; and / or, The end face shape of the first end of the second guide plate matches the shape of the battery cell; and / or, The end face of the first end of the second guide plate is spaced apart from the outer wall of the battery cell.

14. The battery housing according to claim 1, characterized in that, The first body is provided with a liquid inlet pipe, which is fixed to the liquid outlet area. The liquid outlet area has a through hole that communicates with the liquid inlet pipe and penetrates the first body.

15. The battery housing according to claim 1, characterized in that, A plurality of reflux holes are spaced apart along a third direction on the first body, or the reflux holes extend along the third direction; a blocking plate is also provided on the first body, the blocking plate is located between the reflux holes and the end face of the first body adjacent to the reflux holes along the second direction, the length of the blocking plate extends along the third direction, and the blocking plate protrudes from the side of the first body on which the first flow guiding component is provided.

16. The battery housing according to claim 15, characterized in that, An inclined flow guide surface is provided on one side of the block plate near the return hole. The flow guide surface extends from one end close to the first body to the end away from the first body in the first direction, and is inclined towards the first flow guide component in the second direction.

17. The battery housing according to claim 1, characterized in that, The first body has a first groove group on each of its two end faces along the third direction. Each first groove group includes a plurality of first grooves spaced apart along the second direction. The first grooves are recessed toward the area between two adjacent mounting holes.

18. The battery housing according to any one of claims 1 to 17, characterized in that, It also includes a tray, which is connected to the box body and spaced apart from the partition, forming a second chamber between the tray and the partition, wherein the tray includes: The second body has the liquid inlet area disposed on one side of the second body along the first direction; The third flow guiding component is located on the same side of the second body as the liquid inlet area. The third flow guiding component includes multiple third flow guiding channels. The first end of all the third flow guiding channels is connected to the liquid inlet area, and the second end of all the third flow guiding channels is connected to the area where the battery module is located. The third flow guiding component is configured to disperse and guide the coolant in the liquid inlet area to the battery module. A flow guide plate is provided on the same side of the second body along the first direction, and the flow guide plate and the third flow guide component are respectively adjacent to the two ends of the second body along the second direction. A flow guide surface is provided on the side of the flow guide plate near the third flow guide component.

19. The battery housing according to claim 18, characterized in that, The drainage surface is an arc-shaped surface that is concave towards the side away from the third drainage component; or, The drainage surface is an inclined surface, which extends from one end close to the second body to the end away from the second body in the first direction, and is inclined in the second direction away from the third flow guiding component.

20. The battery housing according to claim 18, characterized in that, The battery module has multiple rows of cell groups arranged along a third direction. Each row of cell groups includes multiple cells arranged along the second direction. The third direction is set at an angle to the first direction and the second direction, respectively. At least two adjacent rows of cell groups are formed with a flow guide gap. Multiple third flow guide grooves correspond one-to-one with multiple flow guide gaps.

21. The battery housing according to claim 20, characterized in that, The third flow guiding component includes a plurality of spaced third flow guiding plates, with a third flow guiding groove formed between two adjacent third flow guiding plates. The first end of the third flow guiding plate extends to the liquid inlet area, and the second end of the third flow guiding plate extends to the area adjacent to the battery module.

22. The battery housing according to claim 21, characterized in that, The width of the first end of the third guide plate is L5, and the width of the second end of the third guide plate is L6, where L5 is less than L6; and / or, The end face shape of the second end of the third guide plate matches the shape of the battery cell; and / or, The end face of the second end of the third guide plate is spaced apart from the outer wall of the battery cell.

23. The battery housing according to claim 18, characterized in that, The second body has a protruding diverter located in the liquid inlet area.

24. The battery housing according to claim 23, characterized in that, The outer wall of the diverter is at least partially arc-shaped, and the cross-sectional dimension of the end of the diverter away from the second body in the first direction is smaller than the cross-sectional dimension of the end of the diverter connected to the second body in the first direction.

25. The battery housing according to claim 23, characterized in that, The third flow guiding component includes a plurality of spaced third flow guiding plates, with a third flow guiding groove formed between two adjacent third flow guiding plates. The first end of the third flow guiding plate extends to the liquid inlet area, and the second end of the third flow guiding plate extends to the area adjacent to the battery module. The two outermost third guide plates are the third outer guide plates, and the ends of the two third outer guide plates away from the battery cell are connected. The third guide plates other than the two third outer guide plates are the third inner guide plates, and the ends of the third inner guide plates away from the battery cell are spaced apart from the inner sidewall of the third outer guide plates to form the liquid inlet area. The diverter includes a diverter outer peripheral surface, a diverter bottom surface, and a diverter top surface. The diverter top surface and the diverter bottom surface are spaced apart along the first direction. The diverter outer peripheral surface connects the diverter top surface and the diverter bottom surface. The diverter bottom surface connects to the second body. The size of the diverter top surface is smaller than the size of the diverter bottom surface. The diverter outer peripheral surface includes a connecting surface and a diverter guide surface that are interconnected along the periphery of the diverter. The connecting surface is connected to the inner side surface of the third outer guide plate. The diverter guide surface is a conical surface and faces the third inner guide plate.

26. The battery housing according to claim 18, characterized in that, The second body has multiple mounting slots for securing the battery cells in the battery module.

27. The battery housing according to claim 26, characterized in that, The bottom of the mounting groove is provided with a first pressure relief hole, which penetrates the second body.

28. The battery housing according to claim 26, characterized in that, The second body has a second groove group on each of its two end faces along the third direction. Each second groove group includes a plurality of second grooves spaced apart along the second direction. The second grooves are recessed toward the area between two adjacent mounting slots.

29. The battery housing according to claim 18, characterized in that, The second body has a ring-shaped connecting protrusion around its periphery. The connecting protrusion and the third flow guiding component are located on the same side of the second body. The connecting protrusion has a recessed groove for engaging with the battery housing body.

30. The battery housing according to claim 18, characterized in that, The tray is fixedly connected to the box body; or... The tray is provided with a slot, and one end of the box body along the first direction is inserted into the slot. The slot is provided with sealant, which bonds the box body and the tray and seals the connection between the box body and the tray.

31. The battery housing according to claim 18, characterized in that, The tray has a pressure relief groove recessed on one side away from the partition. The tray has multiple mounting slots for securing the battery cells. The bottom of the mounting slot has a first pressure relief hole, which is connected to the pressure relief groove. A first sealing plate is connected to the side of the tray away from the partition, and the first sealing plate blocks the opening of the pressure relief groove.

32. The battery housing according to claim 31, characterized in that, The box body is provided with a second pressure relief hole, which connects the pressure relief groove and the outside of the box body.

33. The battery housing according to claim 18, characterized in that, The projection of the return hole along the first direction at least partially coincides with the drainage surface.

34. The battery housing according to any one of claims 1-17 or any one of claims 19-33, characterized in that, The height of the second chamber along the first direction is H1, the height of the coolant in the receiving cavity along the first direction is H2, and the dimension of the battery cell along the first direction is H3. The ratio of H1, H2 and H3 satisfies either 2:5:5 or 1:4:

4.

35. The battery housing according to any one of claims 1-17 or any one of claims 19-33, characterized in that, The inlet and outlet are located on the same side of the housing body along the first direction and close to the first chamber, and the inlet and outlet are respectively adjacent to the end where the outlet area is located.

36. The battery housing according to claim 35, characterized in that, The liquid inlet is connected to the second chamber via a liquid inlet pipe, and the liquid inlet pipe is at least partially disposed within the first chamber. The inlet pipe passes through the partition and communicates with the second chamber; or, the inlet pipe is connected to the partition, and the partition has a through hole communicating with the inlet pipe, the through hole passing through the partition.

37. The battery housing according to any one of claims 1-17 or any one of claims 19-33, characterized in that, The box body has an opening communicating with the receiving cavity at one end along the first direction. The end of the box body extends toward the center of the opening to form a mounting part. The mounting part is equipped with a second sealing plate that blocks the opening. The liquid inlet and the liquid outlet are disposed on the mounting part and / or the second sealing plate.

38. The battery housing according to any one of claims 1-17 or any one of claims 19-33, characterized in that, The housing body has a first side plate and a second side plate distributed along a third direction. The inner surfaces of the first side plate and the second side plate are respectively provided with a plurality of third grooves spaced apart along the second direction. The shape of the third groove matches the shape of the outer wall of the battery cell on the outer side of the battery module along the third direction, and the outer wall of the battery cell is spaced apart from the groove wall of the third groove. A protrusion structure is formed between two adjacent third grooves. The protrusion structure is inserted in the area between two adjacent battery cells along the second direction, and the protrusion structure is spaced apart from the outer wall of the battery cell. The shape of the end face of the partition along the third direction matches the shapes of the first side plate and the second side plate.

39. The battery housing according to claim 38, characterized in that, The first side plate and the second side plate are both corrugated plates, and groove structures are formed on the outer surfaces of the first side plate and the second side plate corresponding to the protruding structure.

40. A battery pack, comprising a battery module and a battery housing, wherein the battery module is sealed and installed within the battery housing, characterized in that, The battery housing is as described in any one of claims 1 to 39.

41. The battery pack according to claim 40, characterized in that, The battery module has multiple rows of cell groups arranged along a third direction. Each row of cell groups includes multiple cells arranged along a second direction, and adjacent rows of cell groups are staggered.

42. The battery pack according to claim 41, characterized in that, The battery cell is a cylindrical battery cell.

43. The battery pack according to claim 41, characterized in that, The partition of the battery box is located at the middle of the battery cell along the first direction.

44. A method for cooling a battery pack, applied to the battery pack as described in any one of claims 40 to 43, comprising: Coolant is provided so that it enters the second chamber through the inlet of the battery box and immerses the portion of the battery cell located in the second chamber along a second direction from one end of the second chamber where the inlet area is provided toward the end away from the inlet area. The coolant in the second chamber enters the first chamber through the return hole on the partition, and the portion of the battery cell located in the first chamber is immersed in the second direction from the end of the first chamber with the return hole toward the end where the liquid outlet area is located. The coolant is collected in the outlet area and discharged through the outlet of the battery housing.

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