Tray, battery box body and battery pack

Abstract

The utility model discloses a tray, battery box and battery pack, the tray includes second body, third diversion subassembly and drainage plate, the second body is provided with the liquid inlet area, the liquid inlet area is set to be communicated with battery box's liquid inlet, the liquid inlet area is set in the one side of second body along the first direction, the liquid inlet area is set to be communicated with the battery box's liquid inlet, the liquid inlet area is set to be communicated with the battery box's liquid inlet. The third flow guide assembly and the liquid inlet area are located on the same side face of the second body, the third flow guide assembly comprises a plurality of third flow guide grooves, the first ends of the third flow guide grooves communicate with the liquid inlet area, the second ends of the third flow guide grooves communicate with the area where the battery module is located, and the third flow guide assembly is arranged to disperse and guide cooling liquid in the liquid inlet area to the battery module; the drainage plate and the third flow guide assembly are located on the same side face of the second body in the first direction and are adjacent to the two ends of the second body in the second direction respectively, and the drainage plate is provided with a drainage face. The tray disclosed by the utility model can disperse the cooling liquid entering the battery box body, so that each battery cell can be uniformly immersed in the cooling liquid with lower temperature, and the service life of the battery cell is prolonged.

Description

[0001] This utility model claims the priority of the patent application with the application number PCT / CN2024 / 094021 (the filing date of the prior application is May 17, 2024, and the patent application title is Partition, Tray, Battery Box, Battery Pack and Cooling Method of Battery Pack). Technical Field

[0002] This utility model relates to the technical field of batteries, and particularly relates to a tray, a battery box and a battery pack including this battery box. Background Art

[0003] A battery pack generally includes a battery box and battery modules disposed in the battery box. The battery modules are formed by arranging a plurality of battery cells in a set manner. The heat dissipation of the battery pack is extremely important, and the quality of the heat dissipation effect directly affects the service life of the battery pack. Currently, the battery pack uses air-cooling, water-cooling plate cooling, and immersion coolant cooling methods for heat dissipation. For the immersion coolant cooling method, the coolant is directly fed into the battery box to contact the outer shell of the battery cells for heat exchange. Currently, this heat dissipation method generally sets an inlet at one end in the length direction of the battery box and an outlet at the other end. The inlet introduces the coolant, and after the coolant submerges the battery cells, it flows out from the outlet. The coolant is cooled outside the battery box and then transported back to the inlet, so as to circulate to cool the battery cells of the battery module.

[0004] The related technology has the following situation: After the coolant enters the battery box, the position closer to the inlet can contact more coolant with a lower temperature, while the position farther from the inlet contacts less or even cannot contact the coolant with a lower temperature, resulting in some battery cells in the battery box not being submerged by the coolant with a lower temperature. These battery cells are prone to poor heat exchange effect, and the battery cells with poor heat exchange effect will age prematurely and the capacity will decrease, thereby reducing the service life of the battery pack. Summary of the Utility Model

[0005] The purpose of the embodiment of this utility model is to provide a tray, which can disperse the coolant entering the battery box, so that each battery cell can be more evenly submerged in the coolant with a lower temperature, reduce the probability of the coolant flowing back to the battery cells that have already undergone heat exchange, and extend the service life of the battery cells.

[0006] The purpose of the embodiment of this utility model is to provide a battery box and a battery pack, which have a simple structure, uniform heat exchange of the battery cells, and a long service life of the battery pack.

[0007] To achieve the above object, this utility model adopts the following technical solutions:

[0008] In the first aspect, a tray is provided, which is applied to a battery box and includes:

[0009] A second body, on which a liquid inlet area is provided. The liquid inlet area is configured to communicate with the liquid inlet of the battery box body, and the liquid inlet area is disposed on one side surface of the second body along a first direction;

[0010] A third diversion component, which is located on the same side surface of the second body as the liquid inlet area. The third diversion component includes a plurality of third diversion grooves. The first ends of all the third diversion grooves communicate with the liquid inlet area, and the second ends of all the third diversion grooves communicate with the area where the battery module is located. The third diversion component is configured to disperse and divert the coolant in the liquid inlet area to the battery module;

[0011] A drainage plate, which is located on the same side surface of the second body along the first direction as the third diversion component, and the drainage plate and the third diversion component are respectively adjacent to two ends of the second body along a second direction. A drainage surface is provided on one side surface of the drainage plate close to the third diversion component.

[0012] In a second aspect, a battery box body is provided, including:

[0013] A box body main body, on which a liquid inlet and a liquid outlet are provided at intervals. A receiving cavity is provided inside the box body main body. One end of the box body main body along the first direction is provided with an opening, and the opening communicates with the receiving cavity. The liquid inlet and the liquid outlet also communicate with the receiving cavity;

[0014] A tray, which seals the opening. The liquid inlet area, the third diversion component and the drainage plate on the tray are all disposed in the receiving cavity. Among them, the liquid inlet is directly opposite to the liquid inlet area of the tray.

[0015] In a third aspect, a battery pack is provided, including a battery module and the battery box body described above, and the battery module is sealed and installed in the battery box body.

[0016] Beneficial effects: The tray in this embodiment, by providing a liquid inlet area and a third diversion component, the liquid inlet area is configured to receive the coolant from the liquid inlet of the battery box body, and the third diversion component disperses and diverts the coolant in the liquid inlet area to the battery module, so that the battery module can be more evenly immersed in the coolant for heat exchange and heat dissipation, improving the heat dissipation effect of the battery module. By providing a drainage plate, the drainage plate can drain the coolant after heat exchange with the battery module to other areas for heat exchange or drain it to the outside of the battery box body, ensuring that the heat exchange in other areas can proceed smoothly and reducing the probability of the coolant flowing back to the battery module that has already undergone heat exchange. Description of the Drawings

[0017] The present invention will be further described in detail below with reference to the drawings and embodiments.

[0018] Figure 1 The front view schematic diagram of the partition board of the embodiment of the present utility model.

[0019] Figure 2 The perspective three-dimensional schematic diagram of one perspective of the partition board of the embodiment of the present utility model.

[0020] Figure 3 The perspective three-dimensional schematic diagram of another perspective of the partition board of the embodiment of the present utility model.

[0021] Figure 4 It is Figure 1 The enlarged schematic diagram at position A of

[0022] Figure 5 It is Figure 1 The enlarged schematic diagram at position B of

[0023] Figure 6 The front view schematic diagram of the tray of the embodiment of the present utility model.

[0024] Figure 7 The perspective three-dimensional diagram of one perspective of the tray of the embodiment of the present utility model.

[0025] Figure 8 The perspective three-dimensional diagram of another perspective of the tray of the embodiment of the present utility model.

[0026] Figure 9 It is Figure 6 The enlarged schematic diagram at position C of

[0027] Figure 10 The perspective three-dimensional diagram of one perspective of the integrated structure of the tray and the box body of the embodiment of the present utility model.

[0028] Figure 11 The perspective three-dimensional diagram of another perspective of the integrated structure of the tray and the box body of the embodiment of the present utility model.

[0029] Figure 12 The top view of the battery box body of the embodiment of the present utility model.

[0030] Figure 13 The perspective three-dimensional diagram of one perspective of the battery box body of the embodiment of the present utility model.

[0031] Figure 14 The perspective three-dimensional diagram of another perspective of the battery box body of the embodiment of the present utility model.

[0032] Figure 15 The top view of the battery box body of the embodiment of the present utility model (the second sealing plate is not shown).

[0033] Figure 16 The three-dimensional diagram of the battery box body of the embodiment of the present utility model (the second sealing plate is not shown).

[0034] Figure 17 Top view of the battery pack according to an embodiment of the present utility model (the second sealing plate is not shown).

[0035] Figure 18 Stereogram of the battery pack according to an embodiment of the present utility model (the second sealing plate is not shown).

[0036] Figure 19 Exploded view of the battery pack according to an embodiment of the present utility model.

[0037] Figure 20 Stereogram of the box body according to an embodiment of the present utility model from one perspective.

[0038] Figure 21 Stereogram of the box body according to an embodiment of the present utility model from another perspective.

[0039] Figure 22 Cross-sectional view of the battery pack according to an embodiment of the present utility model (the arrow direction is the coolant flow direction).

[0040] Figure 23 Partial cross-sectional view of the partition according to an embodiment of the present utility model.

[0041] Figure 24 Cross-sectional schematic view of the flow dividing member according to an embodiment of the present utility model.

[0042] In the figure:

[0043] 100, battery box body;

[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, convex structure; 109, groove structure; 1010, installation part; 1011, sealing groove; 1012, step; 1013, second pressure relief hole; 1014, opening;

[0046] 2, partition;

[0047] 201. First body; 2011. Return hole; 20111. Arc-shaped hole wall; 20112. Flat hole wall; 2012. Mounting hole; 2013. Liquid outlet area; 2014. First protrusion; 2015. Immersion hole; 2016. First groove; 2017. Through hole; 2018. Collection tank; 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. Plug plate; 2051. Plug 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. Shunt part; 3041. Shunt top surface; 3042. Shunt outer peripheral surface; 30421. Connection surface; 30422. Shunt guide surface; 3043. Shunt bottom surface; 305. Connection convex part; 3051. Card slot; 306. Support pillar;

[0050] 4. First sealing plate; 5. Second sealing plate; 6. Liquid inlet joint; 7. Liquid outlet joint;

[0051] 200. Battery module; 210. Battery cell group; 211. Battery cell; 220. Flow guide gap. Detailed implementation mode

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

[0053] In this embodiment, the partition 2 includes a first body 201 and a first flow guiding component 202. Among them, the first body 201 is provided with a reflux hole 2011 and a plurality of mounting holes 2012 penetrating along the first direction. The mounting holes 2012 are configured to mount the battery cells 211 of the battery module 200 in the battery box 100. The upper side surface of the first body 201 along the first direction forms a liquid outlet area 2013, and this liquid outlet area 2013 is configured to communicate with the liquid outlet 102 of the battery box 100. The coolant collected in the liquid outlet area 2013 will be discharged to the outside of the battery box 100 through the liquid outlet 102. The liquid outlet area 2013 and the reflux 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 reflux hole 2011 are located at both ends of the partition 2 in the length direction. The mounting holes 2012 are located between the liquid outlet area 2013 and the reflux hole 2011. The first flow guiding component 202 and the liquid outlet area 2013 are both located on the upper side surface of the first body 201. The first flow guiding component 202 includes a plurality of first flow guiding grooves 2021. One ends of all the first flow guiding grooves 2021 communicate with the liquid outlet area 2013, and the other ends communicate with the area where the battery module 200 is located. The first flow guiding component 202 is configured to introduce the coolant in the area where the battery module 200 is located into the liquid outlet area 2013.

[0054] By penetrating and providing the reflux hole 2011 on the first body 201 of the partition 2 in this embodiment, the coolant on the side surface of the first body 201 facing away from the liquid outlet area 2013 (i.e., the lower side surface of the partition 2) can be introduced into the side surface where the liquid outlet area 2013 is provided on the first body 201 (i.e., the upper side surface of the partition 2) through this reflux hole 2011. The reflux 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 coolant can successively submerge the battery cells 211 protruding from the first body 201 from the position where the reflux hole 2011 is located. After heat exchange, it is then collected in the liquid outlet area 2013 and discharged through the liquid outlet 102, increasing the heat exchange effect of the battery cells 211. In addition, by providing the first flow guiding component 202 between the liquid outlet area 2013 and the battery module 200, the coolant that has completed heat exchange at the battery cells 211 can be quickly collected into the liquid outlet area 2013, accelerating the discharge of the coolant at a higher temperature after heat exchange and improving the cooling effect.

[0055] In one embodiment, the battery module 200 has multiple rows of battery cell groups 210 arranged along a third direction. Each row of battery cell groups 210 includes multiple battery cells 211 arranged along a second direction. The third direction is set at an angle to both the first direction and the second direction. At least a flow guiding gap 220 is formed between adjacent two rows of battery cell groups 210. Multiple first flow guiding grooves 2021 correspond to the multiple flow guiding gaps 220 one by one. By making the flow guiding gaps 220 between the battery cell groups 210 correspond to the first flow guiding grooves 2021 one by one, after the coolant is introduced into the return holes 2011, the coolant will be split through the multiple flow guiding gaps 220, increasing the chance of each battery cell 211 in each row of battery cell groups 210 coming into contact with the coolant. After the first flow guiding grooves 2021 are correspondingly connected to the flow guiding gaps 220, most of the coolant after heat exchange between adjacent two rows of battery cell groups 210 is collected to the liquid outlet area 2013 through the first flow guiding grooves 2021 and then discharged to the outside of the battery box 100 as soon as possible through the liquid outlet 102, reducing the backflow or mixing of the coolant after heat exchange between adjacent two rows of battery cell groups 210 to between other rows of battery cell groups 210, thereby avoiding the situation of low local heat exchange efficiency of the battery cells 211.

[0056] In one embodiment, both end faces of the first body 201 along the third direction are spaced from the hole walls of the mounting holes 2012, so that flow guiding gaps 220 are also formed on both sides of the battery module 200 along the third direction. In one embodiment, since the mounting holes 2012 are spaced from both end faces of the first body 201 along the third direction, after the battery cells 211 are installed, a gap can be formed between the battery cells 211 and the end face of the first body 201 (i.e., the partition 2). After the partition 2 is installed in the battery box 100, a gap can be formed between the battery cells 211 and the inner side wall of the battery box 100. This gap is also a flow guiding gap 220 for the coolant to pass through. A first flow guiding groove 2021 is also provided corresponding to the flow guiding gap 220 at this position, so as to ensure that the battery cells 211 on both sides of the battery module 200 along the third direction can also come into contact with the coolant at a lower temperature, ensuring uniform heat exchange of the battery cells 211 at this position.

[0057] In one embodiment, the first flow guiding assembly 202 includes multiple first flow guiding plates 2022 arranged at intervals. A first flow guiding groove 2021 is formed between adjacent two first flow guiding plates 2022. One end of the first flow guiding plate 2022 extends to the liquid outlet area 2013, and the other end extends to the area adjacent to the battery module 200. The outwardly convex first flow guiding plate 2022 can reduce the overall thickness of the first body 201, reduce the occupied space of the entire partition 2 in the battery box 100, improve the energy density of the entire battery pack, and reduce the area of the battery cells 211 blocked by the first body 201. Furthermore, more areas of the battery cells 211 can be immersed in the coolant for heat dissipation.

[0058] In one embodiment, the first flow guide plate 2022 and the first body 201 are integrally injection-molded with plastic. The integrally injection-molded method can reduce the installation and manufacturing difficulty of the first flow guide plate 2022, reduce the number of components, and reduce costs. Of course, the first flow guide plate 2022 can also be manufactured separately and then fixed to the first body 201 by means such as bonding, welding, screw connection, snap connection, etc.

[0059] In other embodiments, a separate first flow guide plate 2022 may not be provided, but the thickness of the first body 201 may be increased, and a first flow guide groove 2021 may be formed by grooving on the first body 201.

[0060] In one embodiment, as Figure 4 shown (refer to the attached Figures 1 to 3 drawing, the attached Figures 15 to 17 drawing, Figure 19 and Figure 22 ), the width of one end of the first flow guide plate 2022 adjacent to the liquid outlet area 2013 is L1, and the width of one end of the first flow guide plate 2022 adjacent to the battery cell 211 is L2, and L1 is less than L2. By widening the width of the part of the first flow guide plate 2022 close to the battery cell 211, the coolant in the flow guide gap 220 can be minimized from entering other areas, and by making the width of one end of the first flow guide plate 2022 close to the liquid outlet area 2013 smaller, a converging effect is formed. 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 in the third direction), the first flow guide assembly 202 needs to be tightened.

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

[0062] In this embodiment, the battery cell 211 is a cylindrical battery cell, and the end face of one end of the first flow guide plate 2022 close to the battery cell 211 is an arc surface. Of course, the battery cell 211 is not limited to being cylindrical, and can also be square, polygonal or irregular. At this time, the end face shape of one end of the first flow guide plate 2022 close to the battery cell 211 can be adjusted according to the outer shape of the battery cell 211.

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

[0064] In one embodiment, as Figure 23 shown (refer to the attached Figures 1 to 22 figure), a collecting groove 2018 is recessed on the first body 201 and located in the liquid outlet area 2013, and all the first diversion grooves 2021 communicate with the collecting groove 2018. The recessed collecting groove 2018 can improve the collecting effect, accelerate the collection of the coolant in the first diversion groove 2021 into this collecting groove 2018, and reduce the probability of the coolant in the first diversion groove 2021 flowing back into the diversion gap 220 of the battery module 200.

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

[0066] In one embodiment, the two first diversion plates 2022 located on the outermost side of the first diversion assembly 202 along the third direction are the first outer diversion plates 20221, and the ends of the two first outer diversion plates 20221 away from the battery cell 211 are connected. The remaining first diversion plates 2022 are the first inner diversion plates 20222, and a liquid outlet area 2013 is formed at an interval between the ends of the first inner diversion plates 20222 close to the first outer diversion plates 20221 and the inner side walls of the first outer diversion plates 20221. By arranging the liquid outlet area 2013 inside the first diversion assembly 202 and using the two first outer diversion plates 20221 to shield the liquid outlet area 2013, it effectively prevents the coolant introduced by the first diversion groove 2021 from entering the outside of the liquid outlet area 2013.

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

[0068] In one embodiment, a submersion hole 2015 is formed through the first body 201 along the first direction. The submersion hole 2015 is located between adjacent mounting holes 2012 and corresponds to the gap between adjacent battery cells 211. The size of the submersion hole 2015 is smaller than that of the return hole 2011. By providing the submersion hole 2015, before the coolant reaches the return hole 2011, a part of the coolant with a lower temperature can be immersed from the lower region of the first body 201 to exchange heat with the battery cells 211 in the upper region of the first body 201, improving the cooling effect. After the coolant introduced through the return hole 2011 enters the diversion gap 220 of the battery module 200 located above the first body 201, it is mixed with this part of the coolant passing through the submersion hole 2015 to exchange heat with the battery cells 211. The temperature of the coolant in the upper region of the first body 201 is higher than that in the lower region. To make the heat dissipation effects of the upper and lower parts of the battery cells 211 consistent, the submersion hole 2015 has the effect of supplementing the coolant with a lower temperature, mixing the coolant introduced through the return hole 2011, and reducing the temperature of the coolant in the upper region of the first body 201. By setting the size of the submersion hole 2015 to be smaller than that of the return hole 2011, the amount of coolant passing through the submersion hole 2015 can be reduced, avoiding affecting the amount of coolant at the return hole 2011 and enabling the battery cells 211 adjacent to the return hole 2011 to maintain a normal heat exchange and cooling effect.

[0069] In this embodiment, the sum of the areas of all the submersion holes 2015 on the first body 201 is S1, and the area of the first body 201 is S2. The ratio relationship between S1 and S2 can satisfy: 1:25000 - 3:50000. For example, the ratio relationship between S1 and S2 can be 1:25000, 1:20000, 3:50000, etc. After the sum of the areas S1 of the submersion holes 2015 satisfies the above ratio relationship, a reasonable liquid immersion amount can be maintained, and the situation of excessive liquid immersion amount affecting the flow rate of the coolant at the return hole 2011 can be avoided.

[0070] The area of a single submersion hole 2015 is S3, and the area of a single return hole 2011 is S4. The ratio relationship between S3 and S4 can satisfy: 2:25 - 1:8. For example, the ratio 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 submersion hole 2015 needs to be much smaller than that of a single return hole 2011, which is beneficial for most of the coolant to flow through the return hole 2011 to the upper region of the first body 201 and push the coolant towards the liquid outlet region 2013, reducing the turbulence phenomenon.

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

[0072] In this embodiment, the immersion holes 2015 are circular holes. In other embodiments, the immersion holes 2015 can also be at least one of semi-circular holes, elliptical holes, square holes, polygonal holes, and irregular holes. For example, both circular-hole-shaped immersion holes 2015 and semi-circular-hole-shaped immersion holes 2015 are provided on the first body 201.

[0073] In this embodiment, the return holes 2011 are semi-circular holes, and the arc-shaped hole wall 20111 of the return holes 2011 is located on the side facing the battery cell 211 of the flat hole wall 20112.

[0074] In one embodiment, a plurality of return holes 2011 are arranged at intervals along the third direction on the first body 201. The number of the return holes 2011 is the same as the number of the flow guiding gaps 220 of the battery module 200, and the positions are also arranged in one-to-one correspondence, that is, one flow guiding gap 220 corresponds to one return hole 2011. This design enables the coolant introduced below the first body 201 by the return holes 2011 to be evenly divided into the corresponding flow guiding gaps 220 as much as possible when flowing to the upper part of the first body 201, improving the heat exchange and heat dissipation effect of the coolant on each battery cell 211.

[0075] A baffle plate 205 is further provided on the first body 201. The baffle plate 205 is located between the return hole 2011 and the end face of the first body 201 along the second direction adjacent to the return hole 2011. The length of the baffle plate 205 extends along the third direction, and the baffle plate 205 protrudes from the side of the first body 201 where the first flow guiding assembly 202 is provided (that is, the baffle plate 205 protrudes from the upper side of the first body 201). There is a certain distance between the return hole 2011 and the end of the first body 201. After the partition plate 2 is installed on the box body 1, there is still a space between the return hole 2011 and the box body 1. If the baffle plate 205 is not provided, when the coolant enters above the first body 201 from the return hole 2011, part of the coolant is very likely to accumulate in this space and cannot smoothly enter the flow guiding gap 220 of the battery module 200 for heat exchange. Therefore, the baffle plate 205 is provided to effectively prevent the coolant from staying in the space between the hole wall of the return hole 2011 and the box body 1, so that the coolant entering above the first body 201 from below the first body 201 through the return hole 2011 can all enter the flow guiding gap 220 of the battery module 200 for heat exchange. In an embodiment, both ends of the baffle plate 205 along the third direction respectively abut against the two inner side walls of the box body 1 along the third direction. This design is to reduce the phenomenon that the coolant stays in the areas at both ends of the baffle plate 205 along the third direction.

[0076] In an embodiment, an inclined baffle plate flow guiding surface 2051 is provided on the side surface of the baffle plate 205 close to the return hole 2011. The baffle plate flow guiding surface 2051 is inclined from the end close to the first body 201 towards the end far from the first body 201 and towards the side where the first flow guiding assembly 202 is located (that is, an inclined baffle plate flow guiding surface 2051 is provided on the side surface of the baffle plate 205 close to the return hole 2011. The baffle plate flow guiding surface 2051 extends from the end close to the first body 201 towards the end far from the first body 201 in the first direction and is inclined towards the direction close to the first flow guiding assembly 202 in the second direction). The inclined baffle plate flow guiding surface 2051 can guide the coolant led out from the return hole 2011 towards the side where the first flow guiding assembly 202 and the battery module 200 are located, thereby accelerating the coolant to enter the flow guiding gap 220. In an embodiment, the side edge of the baffle plate flow guiding surface 2051 close to the first body 201 is flush with the flat hole wall 20112 of the return hole 2011. This design can ensure that all the coolant led out from the return hole 2011 can be guided by the baffle plate flow guiding surface 2051, and the resistance of the coolant to the baffle plate 205 is reduced, accelerating the flow of the coolant.

[0077] Of course, the return holes 2011 are not limited to semi-circular holes, and can also be at least one of circular holes, elliptical holes, square holes, polygonal holes, and irregular-shaped holes. For example, on the first body 201, return holes 2011 in the form of semi-circular holes and return holes 2011 in the form of circular holes are both provided. In addition, the return holes 2011 are not limited to multiple ones, and only one return hole 2011 can also be provided. When only one return hole 2011 is provided, the length of the return hole 2011 can be set to extend along the third direction, so that the return hole 2011 can deliver the coolant to all the diversion gaps 220.

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

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

[0080] In one embodiment, a second diversion assembly 203 is provided on the first body 201. The second diversion assembly 203 is adjacent to the return hole 2011. The second diversion assembly 203 and the first diversion assembly 202 are located on the same side surface of the first body 201, that is, the second diversion assembly 203 is also located on the upper side surface of the first body 201. The second diversion assembly 203 includes a plurality of second diversion grooves 2031, and all the second diversion grooves 2031 are respectively communicated with the return hole 2011 and the area where the battery module 200 is located. By providing the second diversion assembly 203, the second diversion assembly 203 can conduct a directional guide for the coolant led out from the return hole 2011, and try to guide the coolant in the return hole 2011 to the battery module 200 for heat dissipation. The setting of the plurality of second diversion grooves 2031 is also to disperse the coolant and ensure that the battery cells 211 at various positions of the battery module 200 can be cooled as evenly as possible.

[0081] In this embodiment, the plurality of second diversion grooves 2031 correspond to the plurality of diversion gaps 220 one by one. By corresponding the positions and quantities of the second diversion grooves 2031 and the diversion gaps 220, the coolant introduced by the return hole 2011 can sequentially pass through the second diversion grooves 2031, the diversion gaps 220, and the first diversion groove 2021 and converge to the liquid outlet area 2013, minimizing the situation of the coolant mixing at the second diversion assembly 203, and thus avoiding the situation of low local heat exchange efficiency of the battery cells 211.

[0082] In one embodiment, each second diversion channel 2031 communicates with one return hole 2011. This design is to achieve uniform diversion, ensure the balance of the flow rate and temperature of the coolant in each diversion gap 220, and further ensure uniform heat dissipation of the battery cells 211 in each row of battery cell groups 210. Of course, each second diversion channel 2031 is not limited to communicating with only one return hole 2011, and each second diversion channel 2031 can also communicate with two or more return holes 2011. For all the second diversion channels 2031, return holes 2011 with the same quantity can be provided to communicate with each second diversion channel 2031, or return holes 2011 with different quantities can be provided corresponding to the second diversion channels 2031. If the battery cells 211 in the middle of the battery module 200 along the third direction generate more heat than those on both sides, the quantity of the return holes 2011 corresponding to the battery cells 211 in the middle can be increased, so that the second diversion channels 2031 at this position communicate with more return holes 2011, increasing the coolant flow rate at this position.

[0083] In this embodiment, the second diversion assembly 203 includes a plurality of second diversion plates 2032 arranged at intervals, and a second diversion channel 2031 is formed between two adjacent second diversion plates 2032. One end of the second diversion plate 2032 extends to the area adjacent to the battery cell 211. The outwardly convex second diversion plate 2032 can reduce the overall thickness of the first body 201, reduce the occupied space of the entire partition plate 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. Furthermore, more areas of the battery cell 211 can be immersed in the coolant for heat dissipation.

[0084] In one embodiment, the second diversion plate 2032 and the first body 201 are integrally injection-molded with plastic. The integrally injection-molded method can reduce the installation and manufacturing difficulty of the second diversion plate 2032, reduce the number of components, and reduce costs. Of course, the second diversion plate 2032 can also be manufactured separately and then fixed to the first body 201 by means such as bonding, welding, screw connection, snap connection, etc.

[0085] In other embodiments, a separate second diversion plate 2032 may not be provided, and the thickness of the first body 201 can be increased, and a second diversion channel 2031 is formed by grooving on the first body 201.

[0086] In one embodiment, as Figure 5 shown (refer to the appendix Figures 1 to 3 , appendix Figures 15 to 17 , Figure 19 and Figure 22) The width of one end of the second deflector 2032 away from the liquid outlet area 2013 is L3, and the width of one end of the second deflector 2032 adjacent to the liquid outlet area 2013 is L4, where L3 is less than L4. By widening the width of the part of the second deflector 2032 close to the battery cell 211, the amount of coolant entering other areas within the diversion gap 220 can be minimized. Making the width of one end of the second deflector 2032 away from the liquid outlet area 2013 smaller is to avoid the opening position of the return hole 2011 and prevent blocking the return hole 2011.

[0087] The end face shape of one end of the second deflector 2032 adjacent to the liquid outlet area 2013 matches the outer shape of the battery cell 211. This design is to make the second deflector 2032 fit the shape of the battery cell 211 better, forming a better diversion effect, so that the coolant in the second diversion groove 2031 can enter the diversion gap 220 with less resistance.

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

[0089] In addition, the end face of one end of the second deflector 2032 adjacent to the battery cell 211 is spaced from the outer side wall of the battery cell 211. This design can prevent the second deflector 2032 from directly abutting against the outer side wall of the battery cell 211, thereby preventing the second deflector 2032 from blocking the battery cell 211 and enabling the battery cell 211 to contact and exchange heat with as much coolant as possible.

[0090] In one embodiment, a liquid inlet pipe 204 is provided on the first body 201. The liquid inlet pipe 204 is fixed to the liquid outlet area 2013, and a through hole 2017 communicating with the liquid inlet pipe 204 is provided in the liquid outlet area 2013. The through hole 2017 penetrates the first body 201. By providing the liquid inlet pipe 204, it is convenient to introduce the liquid at the liquid inlet 101 into the lower area of the first body 201, avoiding the mixing of the liquid at the liquid inlet 101 and the coolant in the liquid outlet area 2013. After the partition 2 is installed in the box body 1, the area below the partition 2 will first introduce coolant for heat exchange and heat dissipation, and then the coolant will enter the area above the partition 2 through the return hole 2011, and then immerse the battery cell 211 from the position close to the return hole 2011 to 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 in the liquid outlet area 2013. It can also directly penetrate through the through hole 2017 and then partially extend into the area below the first body 201. It is also possible not to provide the liquid inlet pipe 204 and directly set the liquid inlet 101 in the area below the first body 201, that is, the liquid inlet 101 is directly communicated with the area below 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 from plastic. The integrally injection-molded method has low manufacturing cost, few components, and is convenient for installation. It is also possible to separately manufacture each component 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, and then fix them to the first body 201 by welding, bonding, screw connection, or snap connection.

[0093] In one embodiment, first groove groups are provided on both end faces of the first body 201 along the third direction. Each group of first groove groups includes a plurality of first grooves 2016 spaced along the second direction. The first grooves 2016 are recessed towards the area between two adjacent mounting holes 2012. By providing the first grooves 2016, the space at both ends of the first body 201 along the third direction can be reduced. Because when the sizes of the adjacent battery cell groups 210 are the same, the width of the flow guide gap 220 is consistent. If the first grooves 2016 are not provided for the flow guide gaps 220 on both sides of the battery module 200 along the third direction, then flow guide gaps 220 with inconsistent widths will be formed, which will cause the cooling effects of the battery cells 211 on both sides of the battery module 200 to be inconsistent with the cooling effect of the battery cells 211 in the middle. In one embodiment, the first grooves 2016 are arc-shaped grooves, and two adjacent first grooves 2016 are connected by an arc-shaped first protrusion 2014, so that the end face of the first body 201 along the third direction forms a wavy surface.

[0094] Refer to Figures 12 to 16 (Some of the reference numerals are carried over from the attached Figures 1 to 3 、attached Figures 17 to 22) The present invention also provides a battery case 100, which includes a case body 1, in which a receiving cavity is arranged. The battery case 100 also includes a partition 2 provided in the present invention, which is arranged in the case body 1 and divides the receiving cavity into a first chamber 103 and a second chamber 104 which are independent of each other. The first guide component 202, the second guide component 203 and the blocking plate 205 on the partition 2 are all located in the first chamber 103, the liquid inlet 101 is connected to the second chamber 104, the battery cell 211 is fixed in the mounting hole 2012 of the first body 201, one end of the battery cell 211 extends into the first chamber 103, and the other end Extending into the second chamber 104, the liquid inlet 101 delivers the cooling liquid into the second chamber 104, and the cooling liquid flows from the end of the second chamber 104 where the first guide component 202 is located close to the partition 2 to the end where the reflux hole 2011 is located to immerse the battery cell 211 for heat exchange and heat dissipation, and then enters the first chamber 103 through the reflux hole 2011. Under the guidance of the blocking plate guide surface 2051 of the blocking plate 205, the cooling liquid is diverted to the second guide groove 2031 of each second guide component 203, and then passes through the guide gap 220 of the battery module 200 and the first guide groove 2021, and then gathers in the liquid outlet area 2013, and is finally discharged through the liquid outlet 102.

[0095] This battery box 100 is divided by the partition 2 to form an independent first chamber 103 and a second chamber 104. Under the joint action of the first guide component 202, the second guide component 203, the blocking plate 205 and the reflux hole 2011 on the partition 2, the battery cell 211 is effectively heat-exchanged and dissipated, thereby avoiding aging of local battery cells 211 due to uneven heat dissipation and extending the service life of the entire battery module 200.

[0096] In addition, when the battery cell 211 is installed in the mounting hole 2012, it is fixed and sealed by sealant to prevent the battery cell 211 from shifting on the partition 2. It can also prevent the coolant in the area above the partition 2 (i.e., the coolant in the first chamber 103) from entering the area below the partition 2 (i.e., the second chamber 104) through the gap between the battery cell 211 and the hole wall of the mounting hole 2012, thereby effectively preventing the coolant from mixing.

[0097] In other embodiments, the first direction is not limited to being a vertical direction, and the first direction may be set to a horizontal direction, that is, when the battery case 100 is placed upright, the first direction is a horizontal direction. It is also not limited to setting the second direction to be a length direction of the battery case 100 and the third direction to be a width direction of the battery case 100. The second direction may also be set to be a width direction of the battery case 100 and the third direction to be a length direction of the battery case 100. The specific direction limitation is not repeated here.

[0098] ReferenceFigures 17 to 22 , embodiments of the present utility model further provide a battery pack, which includes a battery box body 100 and a battery module 200. An accommodation cavity is provided in the battery box body 100, and the battery module 200 is arranged in the accommodation cavity. The specific structure of the battery box body 100 will not be elaborated herein.

[0099] As Figures 6 to 8 shown (refer to the attached Figures 15 to 17 、 Figure 19 and Figure 22 ), embodiments of the present utility model provide a tray 3, which is applied to the battery box body 100. In this embodiment, the first direction is the vertical direction, the second direction is the length direction of the battery box body 100, that is, the length direction of the tray 3, and the third direction is the width direction of the battery box body 100, that is, the width direction of the tray 3.

[0100] In this embodiment, the tray 3 includes a second body 301, a third diversion assembly 302, and a drainage plate 303. Among them, a liquid inlet area 3011 is provided on the second body 301. The liquid inlet area 3011 is set to communicate with the liquid inlet 101 of the battery box body 100. The liquid inlet area 3011 is arranged on the upper side surface of the second body 301 along the first direction. The third diversion assembly 302 is also located on the upper side surface of the second body 301 along the first direction. The third diversion assembly 302 includes a plurality of third diversion grooves 3021. One ends of all the third diversion grooves 3021 are communicated with the liquid inlet area 3011, and the other ends are communicated with the area where the battery module 200 is located. The third diversion assembly 302 is set to disperse and divert the coolant in the liquid inlet area 3011 to the battery module 200. The drainage plate 303 is also located on the upper side surface of the second body 301 along the first direction, and the drainage plate 303 and the third diversion assembly 302 are respectively adjacent to both ends of the second body 301 along the second direction. A drainage surface 3031 is provided on the side surface of the drainage plate 303 close to the third diversion assembly 302.

[0101] By providing the liquid inlet area 3011 and the third diversion assembly 302 in the tray 3 of this embodiment, the liquid inlet area 3011 is set to receive the coolant from the liquid inlet 101 of the battery box body 100. The third diversion assembly 302 disperses and diverts the coolant in the liquid inlet area 3011 to the battery module 200, so that the battery module 200 can be more evenly immersed in the coolant for heat exchange and heat dissipation, improving the heat dissipation effect of the battery module 200. By providing the drainage plate 303, the drainage plate 303 can drain the coolant after heat exchange with the battery module 200 to other areas for heat exchange or drain it to the outside of the battery box body 100, ensuring the smooth progress of heat exchange in other areas and reducing the probability of the coolant flowing back to the battery module 200 that has already undergone heat exchange.

[0102] In this embodiment, the drainage surface 3031 is an arc surface that is concave toward the side away from the third diversion component 302. By setting the drainage surface 3031 as an inwardly concave arc surface, the resistance of the coolant at the drainage surface 3031 can be reduced, ensuring that the coolant can be quickly drained to other areas for heat exchange or drained to the outside of the battery box 100. Of course, the drainage surface 3031 is not limited to being an inwardly concave arc surface and can also be an inclined surface. In one embodiment, the drainage surface 3031 is inclined from the end close to the second body 301 toward the end away from the second body 301 and toward the side away from the third diversion component 302, that is, the drainage surface 3031 is inclined upward from bottom to top toward the side away from the third diversion component 302. The inclined drainage surface 3031 can also reduce the resistance of the coolant.

[0103] In one embodiment, the battery module 200 has multiple rows of battery cell groups 210 arranged along the third direction. Each row of battery cell groups 210 includes multiple battery cells 211 arranged along the second direction. At least a diversion gap 220 is formed between adjacent two rows of battery cell groups 210, and multiple third diversion grooves 3021 correspond to the multiple diversion gaps 220 one by one. By making the diversion gaps 220 between the battery cell groups 210 correspond to the third diversion grooves 3021 one by one, when the externally cooled coolant enters the liquid inlet area 3011, it can be diverted through the third diversion grooves 3021, and the diversion gap 220 corresponding to and communicating with the position of the third diversion groove 3021 can receive the diverted coolant, increasing the chance of each battery cell 211 of each row of battery cell groups 210 coming into contact with the coolant, and the temperature drop is relatively uniform. The coolant after heat exchange is then guided to other areas for heat exchange or drained to the outside of the battery box 100 through the drainage surface 3031, reducing the backflow or mixing of the coolant after heat exchange between adjacent two rows of battery cell groups 210 to other rows of battery cell groups 210, thereby avoiding the situation of low local heat exchange efficiency of the battery cells 211.

[0104] In one embodiment, both end faces of the second body 301 along the third direction are spaced from the outer side walls of the battery module 200, so that diversion gaps 220 are also formed on both sides of the battery module 200 along the third direction. In one embodiment, during installation, the two sides of the battery module 200 along the third direction do not directly abut against the inner side walls of the battery box 100 because it is necessary to avoid the situation where the battery cells 211 cannot be wetted by the coolant locally and have poor heat dissipation. The diversion gaps 220 formed on both sides of the battery module 200 along the third direction also correspond to the third diversion grooves 3021, and the coolant entering the liquid inlet area 3011 can also enter the diversion gaps 220 on both sides of the battery module 200 along the third direction through the third diversion grooves 3021 at this position, ensuring that each battery cell 211 can be wetted by the coolant for heat exchange and heat dissipation, and thus ensuring uniform heat exchange of all battery cells 211.

[0105] In one embodiment, the third diversion assembly 302 includes a plurality of third diversion plates 3022 arranged at intervals. A third diversion groove 3021 is formed between two adjacent third diversion plates 3022. One end of the third diversion plate 3022 extends to the liquid inlet area 3011, and the other end extends to an area adjacent to the battery module 200. The outwardly convex third diversion plate 3022 can reduce the overall thickness of the second body 301, reduce the occupied space of the entire tray 3 in the battery box 100, and improve the energy density of the entire battery pack.

[0106] In one embodiment, the third diversion plate 3022 and the second body 301 are integrally injection-molded with plastic. The integrally injection-molded method can reduce the installation and manufacturing difficulty of the third diversion plate 3022, reduce the number of components, and reduce costs. Of course, the third diversion plate 3022 can also be manufactured separately and then fixed to the second body 301 by means such as bonding, welding, screw connection, snap connection, etc.

[0107] In other embodiments, a separate third diversion plate 3022 may not be provided, but the thickness of the second body 301 may be increased, and a third diversion groove 3021 may be formed by grooving on the second body 301. This design requires at least part of the battery cell 211 to be embedded in the second body 301 so that the dispersed diversion of the coolant in the third diversion groove 3021 can achieve the effect.

[0108] In one embodiment, as Figure 9 shown (refer to the attached Figures 6 to 8 , attached Figures 15 to 17 , Figure 19 and Figure 22 ), the width of one end of the third diversion plate 3022 adjacent to the liquid inlet area 3011 is L5, and the width of one end of the third diversion plate 3022 adjacent to the battery cell 211 is L6, and L5 is less than L6. By widening the width of the part of the third diversion plate 3022 close to the battery cell 211, the coolant in the diversion gap 220 can be minimized from entering other areas, and by making the width of one end of the third diversion plate 3022 close to the liquid inlet area 3011 small, a converging effect is formed. 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 in the third direction), it is necessary to tighten the third diversion assembly 302 to facilitate the coolant to be smoothly introduced from the liquid inlet area 3011 into all the third diversion grooves 3021.

[0109] The end face shape of the third flow guide plate 3022 adjacent to one end of the battery cell 211 matches the outer shape of the battery cell 211. This design is to make the third flow guide plate 3022 fit the shape of the battery cell 211 better, forming a better flow guiding effect, so that the coolant in the third flow guide groove 3021 can enter the flow guiding gap 220 with less resistance. In this embodiment, the battery cell 211 is a cylindrical battery cell, and the end face of the third flow guide plate 3022 close to the battery cell 211 is an arc surface. Of course, the battery cell 211 is not limited to being cylindrical, and can also be square, polygonal or irregular. At this time, the end face shape of the third flow guide plate 3022 close to the battery cell 211 can be adjusted according to the outer 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. This design can prevent the third flow guide plate 3022 from directly abutting against the outer side wall of the battery cell 211, thereby preventing the third flow guide plate 3022 from blocking the battery cell 211, so that the battery cell 211 can contact and exchange heat with the coolant as much as possible.

[0111] In one embodiment, a flow dividing member 304 is protrudingly provided on the second body 301, and this flow dividing member 304 is located in the liquid inlet area 3011. By providing the flow dividing member 304, the coolant delivered by the liquid inlet 101 can be divided, avoiding the coolant accelerating locally towards a certain third flow guide groove 3021. The flow dividing member 304 first divides the coolant once, and then the divided coolant can be basically evenly delivered to each third flow guide groove 3021, thereby ensuring that each flow guiding gap 220 can obtain coolant with the same temperature and basically the same flow rate, ensuring the same cooling effect for each battery cell 211, reducing the temperature difference of the battery cells 211, and extending the service life of the entire battery module 200.

[0112] In this embodiment, at least part of the outer side wall of the flow dividing member 304 is an arc surface, and the cross-sectional dimension of the end of the flow dividing member 304 far 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 providing an arc surface on the outer side wall of the flow dividing member 304, the splashing of the coolant delivered by the liquid inlet 101 at the flow dividing member 304 can be reduced, ensuring that the coolant can be divided along the outer side wall of the flow dividing member 304. The structure with a smaller upper end and a larger lower end can form a better flow dividing effect, and a dispersed structure is formed at the lower end of the flow dividing member 304 to ensure that the coolant can be evenly divided.

[0113] In one embodiment, as Figure 24 shown (refer to the appendix Figure 1 to the appendix Figure 22) Among them, the two third flow guiding plates 3022 located on the outermost side along the third direction are the third outer flow guiding plates 30221, and one ends of the two third outer flow guiding plates 30221 away from the battery cell 211 are connected. The remaining third flow guiding plates 3022 are the third inner flow guiding plates 30222. One ends of the third inner flow guiding plates 30222 away from the battery cell 211 are spaced from the inner side walls of the third outer flow guiding plates 30221 to form a liquid inlet area 3011. The flow dividing member 304 includes a flow dividing outer peripheral surface 3042, a flow dividing bottom surface 3043, and a flow dividing top surface 3041. The flow dividing top surface 3041 and the flow dividing bottom surface 3043 are spaced along the first direction. The flow dividing outer peripheral surface 3042 connects the flow dividing top surface 3041 and the flow dividing bottom surface 3043. The flow dividing bottom surface 3043 is connected to the second body 301. The size of the flow dividing top surface 3041 is smaller than the size of the flow dividing bottom surface 3043. The flow dividing outer peripheral surface 3042 includes a connecting surface 30421 and a flow dividing guiding surface 30422 that are connected to each other along the circumference of the flow dividing member 304. The connecting surface 30421 is connected to the inner side surface of the third outer flow guiding plate 30221. The flow dividing guiding surface 30422 is a conical surface, and the flow dividing guiding surface 30422 faces the third inner flow guiding plate 30222. The structural form of the flow dividing member 304 is actually the structure of half of a cone cut along its own central axis direction. By setting the flow dividing outer peripheral surface 3042 of the flow dividing member 304 to a structure where the connecting surface 30421 and the flow dividing guiding surface 30422 are connected, the connecting surface 30421 can be connected to the third outer flow guiding plate 30221 (the connecting surface 30421 is not exposed after connection), while the conical surface-structured flow dividing guiding surface 30422 is exposed outside the flow dividing member 304. The conical surface structure is used to divide the coolant from top to bottom. The conical surface structure minimizes the resistance and splashing of the coolant, ensuring that the coolant gradually disperses from the smaller-sized flow dividing top surface 3041 to the larger-sized flow dividing bottom surface 3043 along the conical surface structure. The dispersed coolant then enters the third flow guiding groove 3021, and at this time, the coolant will be more evenly distributed in each third flow guiding groove 3021.

[0114] In one 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 easily fixed on the tray 3, reducing the fixing difficulty of the battery cell 211 and preventing the battery cell 211 from shifting. In one embodiment, the battery cell 211 is bonded to the mounting groove 3012 with a sealant.

[0115] A first pressure relief hole 3013 is provided at the bottom of the installation groove 3012, and the first pressure relief hole 3013 penetrates through the second body 301. By providing the first pressure relief hole 3013 at the bottom of the installation groove 3012, when the battery cell 211 fails, substances such as the electrolyte ejected by pressure relief of the battery cell 211 can be discharged to the bottom of the tray 3 through the first pressure relief hole 3013, that is, the side of the tray 3 away from the coolant, avoiding contamination of the coolant by substances such as the electrolyte and also preventing the faulty battery cell 211 from affecting the remaining adjacent battery cells 211. In this embodiment, since the battery cell 211 is bonded to the installation groove 3012 by a sealant, the bonding position of the sealant can also play a sealing role to prevent the coolant from leaking from the upper region of the tray 3 to the lower region of the tray 3.

[0116] In one embodiment, second groove groups are provided on both end faces of the second body 301 along the third direction. Each group of second groove groups includes a plurality of second grooves 3014 spaced along the second direction, and the second grooves 3014 are recessed towards the region between two adjacent installation grooves 3012. By providing the second grooves 3014, the space at both ends of the second body 301 along the third direction can be reduced. Because when the sizes of the adjacent battery cell groups 210 are the same, the widths of the flow guiding gaps 220 are consistent. If the second grooves 3014 are not provided in the flow guiding gaps 220 on both sides of the battery module 200 along the third direction, then flow guiding gaps 220 with inconsistent widths will be formed, which will cause the cooling effects of the battery cells 211 on both sides of the battery module 200 to be inconsistent with the cooling effect in the middle. In one embodiment, the second grooves 3014 are arc-shaped grooves, and two adjacent second grooves 3014 are connected by an arc-shaped second protrusion 3016, so that the end face of the second body 301 along the third direction forms a wavy surface.

[0117] In one embodiment, a connecting convex portion 305 protrudes annularly around the circumference of the second body 301. The connecting convex portion 305 and the third flow guiding component 302 are located on the same side of the second body 301, that is, the connecting convex portion 305 protrudes from the upper side of the second body 301. A clamping groove 3051 for clamping the box body body 1 of the battery box 100 is recessed on the connecting convex portion 305. By providing the connecting convex portion 305 and the clamping groove 3051, the tray 3 and the box body body 1 can be separately manufactured and then connected by an assembly method, which can reduce the manufacturing difficulty. During specific assembly, a sealant can be provided in the clamping groove 3051, and the lower end of the box body body 1 is inserted into the clamping groove 3051 and fixed by bonding with the sealant. After bonding, a seal is also achieved between the box body body 1 and the tray 3 through the sealant, avoiding coolant leakage.

[0118] In other embodiments, it is not limited to providing the connecting convex portion 305 and the clamping groove 3051 to connect the box body body 1, such as Figure 10 and11 As shown, the tray 3 can also be directly welded to the box body 1, or the tray 3 and the box body 1 can be integrally injection-molded or integrally cast, etc.

[0119] Referring to Figures 12 to 16 (Some of the reference numerals are carried over from the attached Figures 6 to 8 , attached Figures 17 to 22 ) An embodiment of the present invention also provides a battery box 100. This battery box 100 includes a box body 1. An accommodation cavity is provided inside the box body 1. The battery box 100 also includes the tray 3 provided by the embodiment of the present invention. An opening 1014 is provided at the lower end of the box body 1, and the tray 3 seals this opening 1014. The liquid inlet area 3011, the third diversion assembly 302, the drainage plate 303, and the flow dividing member 304 on the tray 3 are all provided in the accommodation cavity. A liquid inlet 101 and a liquid outlet 102 are also provided on the box body 1. The liquid inlet 101 and the liquid outlet 102 are both communicated with the accommodation cavity. Among them, the liquid inlet 101 is disposed opposite to the flow dividing member 304 of the tray 3. After the coolant enters the box body 1 of the battery box 100 from the liquid inlet 101, it is first divided by the flow dividing member 304, and then further divided by a plurality of third diversion grooves 3021. The coolant entering the third diversion grooves 3021 enters the diversion gap 220 of the battery module 200 and then converges at the drainage plate 303, 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] Through the diversion, diversion, and drainage of the tray 3 of this battery box 100, effective heat exchange and heat dissipation can be carried out on each battery cell 211 of the battery module 200, avoiding phenomena such as aging of local battery cells 211 due to uneven heat dissipation, and extending the service life of the entire battery module 200.

[0121] In other embodiments, it is not limited that the first direction is the vertical direction. The first direction can also be set as the horizontal direction, that is, when the battery box 100 is placed upright, the first direction is the horizontal direction. Moreover, it is not limited that the second direction is set as the length direction of the battery box 100 and the third direction is set as the width direction of the battery box 100. The second direction can also 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. The specific direction limitations will not be elaborated here.

[0122] Referring to Figures 17 to 22 , an embodiment of the present invention also provides a battery pack, including a battery box 100 and a battery module 200. An accommodation cavity is provided inside the battery box 100, and the battery module 200 is disposed in the accommodation cavity. The specific structure of the battery box 100 will not be elaborated here.

[0123] As Figures 12 to 16 shown (refer to the attached Figures 1 to 3 , attachedFigures 6 to 8 , and attached Figures 17 to 22 ), An embodiment of the present utility model provides a battery box body 100. In this embodiment, the first direction is the vertical direction, the second direction is the length direction of the battery box body 100, and the third direction is the width direction of the battery box body 100.

[0124] Hereinafter, taking the battery cell 211 of the battery module 200 installed in the battery box body 100 as a cylindrical battery cell 211 as an example for illustration. The battery cell 211 is not limited to being a cylindrical battery cell 211, and can also be square, polygonal or special-shaped. The specific structure of the battery cell 211 is not limited, and some structures of the battery box body 100 are adaptively adjusted according to the shape of the battery cell 211, which will not be elaborated here.

[0125] In this embodiment, this battery box body 100 includes a box body main body 1 and a partition plate 2. Among them, a liquid inlet 101 and a liquid outlet 102 are arranged at intervals on the box body main body 1. A receiving cavity for receiving the battery module 200 is arranged in the box body main body 1. The partition plate 2 is arranged in the receiving cavity. The partition plate 2 divides the receiving cavity into a first chamber 103 and a second chamber 104 distributed along the first direction. Among them, the first chamber 103 is located above the second chamber 104. A plurality of mounting holes 2012 for mounting the battery cells 211 of the battery module 200 are opened on the partition plate 2. Both ends of the battery cell 211 extend into the first chamber 103 and the second chamber 104 respectively. A return hole 2011 is opened on the partition plate 2. The partition plate 2 has a liquid outlet area 2013 communicated with the liquid outlet 102. The liquid outlet area 2013 is located in the first chamber 103. The liquid outlet area 2013 and the return hole 2011 are respectively adjacent to both ends of the partition plate 2 along the second direction. The liquid outlet 102 communicates with the liquid outlet area 2013. There is a liquid inlet area 3011 in the second chamber 104. The liquid inlet area 3011 and the liquid outlet area 2013 are located at the same end of the box body main 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 body 100 of the embodiment of the present utility model uses a partition plate 2 to divide the accommodation cavity in the box body main body 1 into independent first and second chambers 103 and 104. After installing the battery cells 211 on the partition plate 2, the two chambers are relatively sealed. The coolant first enters the liquid inlet area 3011 of the second chamber 104 from the liquid inlet 101, and then successively submerges the part of the battery cells 211 located in the second chamber 104 from one end close to the liquid inlet area 3011 towards the end far from the liquid inlet area 3011 along the second direction, performing heat exchange and heat dissipation on the battery cells 211. Then, it enters the first chamber 103 through the return holes 2011 on the partition plate 2, and successively submerges the part of the battery cells 211 located in the first chamber 103 from the side where the return holes 2011 are located towards the liquid outlet area 2013, performing heat exchange on the remaining part of the battery cells 211. The coolant after heat exchange converges in the liquid outlet area 2013 and is discharged through the liquid outlet 102. During the whole process, the coolant performs step-by-step heat exchange on the battery cells 211 of the battery module 200. The special infiltration path of the coolant (a U-shaped infiltration path, i.e., Figure 22 the path indicated by the arrow) increases the probability of each battery cell 211 contacting the coolant, improves the heat exchange uniformity and effect of all battery cells 211, and prolongs the service life of the battery cells 211.

[0127] In this embodiment, the battery module 200 has multiple rows of battery cell groups 210 arranged along the third direction. Each row of battery cell groups 210 includes multiple battery cells 211 arranged along the second direction, and adjacent two rows of battery cell groups 210 are arranged in a staggered manner. This design can make the arrangement of the battery module 200 more compact, ensure higher space utilization rate in the battery box body 100, and the energy density of the battery pack formed after assembling the battery module 200 will be greater.

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

[0129] The battery box body 100 can also be provided with both the partition plate 2 and the tray 3. In one embodiment, the tray 3 is connected to the box body main body 1, and the tray 3 is spaced from the partition plate 2, and a second chamber 104 is formed therebetween, that is, the tray 3 is installed at the bottom of the second chamber 104. The specific structure of the partition plate 2 is the same as that described in the embodiment of the present utility model, and the specific structure of the tray 3 is the same as that described in the embodiment of the present utility model. The specific structures of the partition plate 2 and the tray 3 will not be elaborated here.

[0130] The following takes the battery box body 100 provided with both the partition plate 2 and the tray 3 as an example for description.

[0131] The partition plate 2 is fixed in the middle of the battery cells 211 along the first direction (i.e., the middle in the vertical direction). At this time, the lengths of the battery cells 211 located in the first chamber 103 and the second chamber 104 are the same.

[0132] In this embodiment, the height of the second chamber 104 in the first direction is H1, the liquid level height of the coolant in the accommodation chamber in the first direction is H2, and the dimension of the battery cell 211 in the first direction is H3. The relationship ratio of H1, H2, and H3 can satisfy 2:5:5 or 1:4:4. This relationship ratio design makes the height of the second chamber 104 lower than that of the first chamber 103, which is beneficial to accelerating the flow rate of the coolant in the second chamber 104, and then accelerating the flow of the coolant to the first chamber 103 to cool the battery cell 211, improving the overall heat exchange efficiency of the battery cell 211. In other embodiments, it is not limited to setting the height of the second chamber 104 to be less than that of the first chamber 103. The height of the second chamber 104 and the height of the first chamber 103 can also be set to be the same, that is, the partition 2 is located in the middle of the box body 1 in the first direction, so that the heights of the first chamber 103 and the second chamber 104 are the same.

[0133] The liquid inlet 101 and the liquid outlet 102 are located on the same side of the box body 1 in the first direction and close to the first chamber 103, and both 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 in the first direction, that is, both are set on the upper side or the lower side of the battery box body 100, it is avoided that the liquid inlet 101 and the liquid outlet 102 occupy the space in the horizontal direction of the battery box body 100, the battery box bodies 100 are arranged more closely, and the space utilization rate is increased; by setting both the liquid inlet 101 and the liquid outlet 102 at one end adjacent to the liquid outlet area 2013, the length of the pipeline layout in the battery box body 100 can be shortened, the cost can be saved, and the space occupancy rate in the battery box body 100 can be reduced. In one embodiment, the liquid inlet 101 and the liquid outlet 102 are located on the upper side of the battery box body 100. This design enables the liquid to flow down smoothly into the second chamber 104 below when entering the liquid. After the coolant in the second chamber 104 fills the entire second chamber 104, it then immerses into the first chamber 103 through the return hole 2011.

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

[0135] In one embodiment, the battery box body 100 further includes a first sealing plate 4 and a second sealing plate 5. Openings 1014 are provided at both ends of the box body main body 1 along the first direction. The lower end of the box body main body 1 along the first direction is blocked by a tray 3. A pressure relief groove 3015 is recessed on one side of the tray 3 away from the partition plate 2. A plurality of mounting grooves for clamping the battery cells are formed on the tray. A first pressure relief hole 3013 is formed at the bottom of the mounting groove (that is, a first pressure relief hole 3013 is formed on the tray 3 corresponding to each battery cell 211). The first pressure relief hole 3013 communicates with the pressure relief groove 3015. A first sealing plate 4 is connected to the side of the tray away from the partition plate 4. The first sealing plate 4 blocks the notch of the pressure relief groove 3015. The opening 1014 at the upper end of the box body main body 1 along the first direction is blocked by the second sealing plate 5 to form a sealed battery box body 100. By providing the pressure relief groove 3015, the first pressure relief holes 3013 of the tray 3 can be communicated. The first pressure relief holes 3013 correspond to the positions of the battery cells 211. When the battery cells 211 malfunction and need to relieve pressure, substances such as electrolyte ejected from the battery cells 211 can enter the pressure relief groove 3015 through the first pressure relief holes 3013. The setting of the first sealing plate 4 is to prevent the pressure relief groove 3015 from being exposed, ensure that the pressure relief groove 3015 can store and seal substances such as electrolyte ejected from the battery cells 211, thereby preventing adjacent battery box bodies 100 from affecting each other and avoiding environmental pollution. By providing the openings 1014 and the second sealing plate 5, it is convenient to install components such as the partition plate 2 and the battery module 200, and it is also convenient to maintain the components in the battery box body 100 later.

[0136] In one embodiment, a plurality of support columns 306 are protrudingly provided at the bottom of the pressure relief groove 3015. The support columns 306 are located between adjacent first pressure relief holes 3013. One end of the support column 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 columns 306, the first sealing plate 4 can be supported by the support columns 306 to prevent the first sealing plate 4 from deforming.

[0137] The upper end of the box body 1 along the first direction is provided with an opening 1014 communicating with the accommodation cavity. An installation part 1010 is formed by the end part of the box body extending towards the middle of the opening 1014. The second sealing plate 5 is connected to the installation part 1010 to seal the opening 1014. By providing the installation part 1010, a position convenient for installing the second sealing plate 5 can be formed on the upper side surface of the box body 1. In one embodiment, a sealing groove 1011 is annularly formed around the circumference of the opening 1014 on the installation part 1010. A sealing adhesive is arranged in the sealing groove 1011, and the second sealing plate 5 is connected to the installation part 1010 through the sealing adhesive. In one embodiment, a ring of steps 1012 is annularly arranged on the inner side wall of the installation part 1010. The steps 1012 are spaced from the side surface of the installation part 1010 away from the accommodation cavity (that is, the steps 1012 are sunken, and the upper side surface of the steps 1012 is spaced from the upper side surface of the installation part 1010). The second sealing plate 5 abuts against the steps 1012, and the sealing groove 1011 is formed on the steps 1012. By providing the steps 1012, the installation position of the second sealing plate 5 can be limited, ensuring that the second sealing plate 5 can accurately seal the opening 1014 and effectively preventing the second sealing plate 5 from shifting. In addition to fixing the second sealing plate 5 by means of bonding, the second sealing plate 5 can also be fixed by means of screws combined with a sealing ring, or by means of a clamping structure combined with a sealing ring. The detachable connection method 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 this embodiment, the liquid inlet 101 and the liquid outlet 102 are arranged on the installation part 1010. A liquid inlet joint 6 is arranged corresponding to the liquid inlet 101 on the installation part 1010, and a liquid outlet joint 7 is arranged corresponding to the liquid outlet 102. The external pipeline is connected by using the liquid inlet joint 6 and the liquid outlet joint 7 to realize the circulating cooling of the coolant. Moreover, by arranging both the liquid inlet 101 and the liquid outlet 102 on the installation part 1010, it can also avoid obstacles and pulling of the pipeline when disassembling and assembling the second sealing plate 5. The liquid inlet joint 6 and the liquid outlet joint 7 can adopt the form of quick-disassembly joints to realize the quick disassembly and assembly of the pipeline. 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 respectively arranged on the installation part 1010 and the second sealing plate 5.

[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. A through hole 2017 communicated with the liquid inlet pipe 204 is formed in the partition plate 2, and the through hole 2017 penetrates through the partition plate 2. For the convenience of maintenance and to avoid leakage, the liquid inlet pipe 204 can be directly fixed to the partition plate 2. In other embodiments, the liquid inlet pipe 204 can also be separately arranged. After the partition plate 2 is installed, both ends of the liquid inlet pipe 204 are respectively abutted against the installation part 1010 and the partition plate 2. In addition, the liquid inlet pipe 204 can also directly penetrate through the through hole 2017, that is, a part of the liquid inlet pipe 204 is located in the first chamber 103 and abuts against the position of the installation part 1010 corresponding to the liquid inlet 101, 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 coolant 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 one embodiment, the box body 1 has a first side plate 105 and a second side plate 106 distributed along the third direction. A plurality of third grooves 107 spaced along the second direction are arranged on the inner side surfaces of the first side plate 105 and the second side plate 106. The shape of the third groove 107 matches the shape of the outer side wall of the battery cell 211 on the outer side of the battery module 200 along the third direction, and the outer side wall of the battery cell 211 is spaced from the groove wall of the third groove 107. A convex structure 108 is formed between two adjacent third grooves 107. The convex structure 108 is inserted into the area between two adjacent battery cells 211 along the second direction, and the convex structure 108 is spaced from the outer side wall of the battery cell 211. The two end faces 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. Therefore, the shapes of the two end faces of the partition plate 2 along the third direction match the shapes of the first side plate 105 and the second side plate 106. In one embodiment, the partition plate 2 is provided with a first convex 2014 corresponding to the third groove 107 at the end face along the third direction, and the partition plate 2 is provided with a first groove 2016 corresponding to the convex structure 108 at the end face along the third direction. The outer side wall of the first convex 2014 abuts against the groove wall of the third groove 107, and the outer side wall of the convex structure 108 abuts against the groove wall of the first groove 2016, forming a structure of fitting and abutting to ensure the sealing of the connection positions of the partition plate 2 with 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. A 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 convex structure 108. The two end faces of the partition plate 2 along the third direction form a corrugated surface. By setting 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] To facilitate the assembly of the battery cell 211, in addition to utilizing the restriction of the partition plate 2, an installation groove 3012 can be provided on the tray 3. The number and layout of the installation grooves 3012 are opened according to the number and layout of the battery cells 211 of the battery module 200. The lower end of the battery cell 211 is inserted into the installation groove 3012. The first pressure relief hole 3013 is opened at the bottom of the installation groove 3012 and penetrates the second body 301 of the tray 3 along the first direction (i.e., penetrates the thickness direction of the second body 301). To prevent the coolant from leaking from between the outer wall of the battery cell 211 and the groove wall of the installation groove 3012 to the side of the tray 3 away from the second chamber 104 (i.e., to prevent the coolant from leaking to the outer bottom of the tray 3) after the battery cell 211 and the tray 3 are assembled, a sealant is provided between the groove wall of the installation groove 3012 and the outer wall of the battery cell 211.

[0143] A second pressure relief hole 1013 is opened on the box body 1. The second pressure relief hole 1013 communicates with the pressure relief groove 3015 and the outside of the box body 1. By providing the second pressure relief hole 1013, substances such as electrolyte generated by the pressure relief of the battery cell 211 failure in the pressure relief groove 3015 can be discharged to the outside of the box body 1. In one embodiment, the second pressure relief hole 1013 is opened on one side surface of the box body 1 along the second direction. In other embodiments, it is not limited to opening the second pressure relief hole 1013 on the side surface of the box body 1 along the second direction, and it can also be opened on the side surface of the box body 1 along the third direction (i.e., on the first side plate 105 and / or the second side plate 106).

[0144] In one embodiment, the projection of the return hole 2011 on the partition plate 2 along the first direction at least partially coincides with the drainage surface 3031 of the drainage plate 303 of the tray 3. This design can enable the coolant flowing upward on the drainage surface 3031 to enter the first chamber 103 through the return hole 2011 as quickly as possible, reduce the residence time of the coolant in the second chamber 104, and accelerate the circulation of the coolant. In one embodiment, the projection of the return hole 2011 along the first direction completely coincides with the drainage surface 3031.

[0145] In one embodiment, the tray 3 is fixedly connected to the box body 1. The fixed connection method can reduce the assembly difficulty and prevent the coolant from leaking at the connection position between the tray 3 and the box body 1. In one embodiment, the tray 3 and the box body 1 are formed by an integral manufacturing method. The integral forming method is simple to operate, has no butt joints, and has a good anti-leakage effect. In one embodiment, the tray 3 and the box body 1 are integrally injection molded.

[0146] Of course, it is not limited to fixedly connecting the tray 3 to the box body 1. The tray 3 and the box body 1 can also be detachably connected. In one embodiment, a card slot 3051 is provided on the tray 3. One end of the box body 1 along the first direction is inserted into the card slot 3051. A sealant is provided in the card slot 3051. The sealant bonds the box body 1 and the tray 3 and seals the connection position between the box body 1 and the tray 3. The selected sealant can not only achieve connection and fixation but also achieve good sealing. In one embodiment, a connecting convex portion 305 is annularly provided on the upper surface of the tray 3, and the card slot 3051 is opened on the connecting convex portion 305.

[0147] Such as Figures 17 to 22 (Some of the reference numerals are carried over from the attached Figures 1 to 3 attachment Figures 6 to 8 attachment Figures 12 to 16 ) An embodiment of the present invention further provides a battery pack, including a battery module 200 and a battery box body 100. The battery module 200 is hermetically installed in the battery box body 100. Among them, the battery box body 100 is the battery box body 100 provided by the embodiment of the present invention.

[0148] In one embodiment, after the battery module 200 is installed in the battery box body 100, the lower end of the battery cell 211 of the battery module 200 abuts against the tray 3 in the battery box body 100, while the upper end of the battery cell 211 is spaced from the second sealing plate 5, forming a space for installing components such as a bus bar. The partition plate 2 is stuck in the middle of the length direction of the battery cell 211, that is, the middle of the battery cell 211 along the first direction, so that the lengths of the battery cell 211 in the first chamber 103 and the second chamber 104 are the same, ensuring uniform heat dissipation.

[0149] An embodiment of the present invention further provides a cooling method for a battery pack, including the following steps:

[0150] Step S100: Provide a coolant, and make the coolant enter the second chamber 104 from the liquid inlet 101 of the battery box body 100, and submerge the part of the battery cell 211 located in the second chamber 104 from one end of the second chamber 104 provided with the liquid inlet area 3011 towards the end away from the liquid inlet area 3011 along the second direction;

[0151] Step S200: The coolant in the second chamber 104 enters the first chamber 103 through the return hole 2011 on the partition plate 2, and submerges the part of the battery cell 211 located in the first chamber 103 from one end of the first chamber 103 provided with the return hole 2011 towards the end where the liquid outlet area 2013 is located along the second direction;

[0152] Step S300: The coolant converges in the liquid outlet area 2013 and is then discharged through the liquid outlet 102.

[0153] In one embodiment, step S100 includes:

[0154] Step S110: The coolant enters from the liquid inlet 101 of the battery box 100 and enters the second chamber 104 through the liquid inlet pipe 204.

[0155] Step S120: The coolant first contacts the flow dividing member 304 to achieve flow division, and the coolant is evenly distributed to each third flow guiding groove 3021 of the third flow guiding assembly 302.

[0156] Step S130: The coolant in the third flow guiding groove 3021 is delivered to the corresponding flow guiding gap 220 of the battery module 200, and heat exchange is performed with the lower half parts of each battery cell 211 on one side or both sides of the flow guiding gap 220. The delivery direction of the coolant is from one end of the second chamber 104 provided with the liquid inlet area 3011 along the second direction towards the end far from the liquid inlet area 3011.

[0157] Step S200 includes:

[0158] S210: The coolant heat-exchanged from the flow guiding gap 220 contacts the flow guiding surface 3031 of the flow guiding plate 303 and is guided to the return hole 2011 on the partition plate 2 through the flow guiding surface 3031.

[0159] S220: The coolant enters the first chamber 103 from the return hole 2011 and flows on the side of the blocking plate guiding surface 2051 of the blocking plate 205 towards the liquid outlet area 2013.

[0160] S230: The coolant is guided by the second flow guiding groove 2031 of the second flow guiding assembly 203 to the corresponding flow guiding gap 220, and heat exchange is performed with the upper half parts of each battery cell 211 on one side or both sides of the flow guiding gap 220.

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

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

[0163] The partition plate 2 and the tray 3 inside the battery box body 100 are not limited to being distributed vertically up and down, and can also be distributed horizontally, that is, the first direction is the horizontal direction, and the second direction is not limited to the length direction of the battery box body 100, and the third direction is not limited to the width direction of the battery box body 100. The second direction can also be set as the width direction of the battery box body 100, and the third direction can be set as the length direction of the battery box body 100. When the first direction is the horizontal direction, the first chamber 103 and the second chamber 104 can be arranged left and right or right and left.

[0164] The flow direction of the coolant is as Figure 22 shown (in the direction of the arrow). After entering from the second chamber 104, it immerses from bottom to top to cool the part of the battery cell 211 located in the second chamber 104. When the coolant reaches the top of the second chamber 104, it then enters the first chamber 103 through the return hole 2011, flows from the upper part to the lower part of the first chamber 103 to immerse the part of the battery cell 211 located in the first chamber 103 for cooling, and finally is discharged outside the battery box body 100 from the liquid outlet 102 below the first chamber 103.

[0165] Of course, the first direction is not limited to being horizontal, and can also form a certain angle with the horizontal direction. The specific cooling path of the coolant can refer to the previous example and will not be elaborated here.

Claims

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

2. The pallet according to claim 1, characterized in that: The flow guiding surface is a curved surface that is concave toward a side away from the third flow guiding component; or, The guide surface is an inclined surface, which extends from an end close to the second body to an end away from the second body in the first direction, and is inclined in the second direction toward a direction away from the third guide component.

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

4. The pallet according to claim 3, characterized in that: The third guide assembly includes a plurality of third guide plates arranged at intervals, and the third guide groove is formed between two adjacent third guide plates. The first end of the third guide plate extends to the liquid inlet area, and the second end of the third guide plate extends to an area adjacent to the battery module.

5. The pallet according to claim 4, characterized in that: The width of the first end of the third guide plate is L5, the width of the second end of the third guide plate is L6, and L5 is smaller than L6; and / or, The end surface shape of the second end of the third guide plate matches the shape of the battery core; and / or, An end surface of the second end of the third guide plate is spaced apart from an outer side wall of the battery core.

6. The pallet according to any one of claims 1 to 3, characterized in that: A flow divider is protruding from the second body and is located in the liquid inlet area.

7. The pallet according to claim 6, characterized in that: The outer side wall of the diverter is at least partially an arc surface, and the cross-sectional dimension of one end of the diverter away from the second body in the first direction is smaller than the cross-sectional dimension of one end of the diverter connected to the second body in the first direction.

8. The pallet according to claim 6, characterized in that: The third flow guide assembly includes a plurality of third flow guide plates arranged at intervals, wherein the third flow guide groove is formed between two adjacent third flow guide plates, wherein the first end of the third flow guide plate extends to the liquid inlet area, and the second end of the third flow guide plate extends to an area adjacent to the battery module; The two third guide plates located on the outermost sides are third outer guide plates, and the two third outer guide plates are connected to one end of the battery cell of the battery module, and the third guide plates other than the two third outer guide plates are third inner guide plates, and one end of the third inner guide plate away from the battery cell is spaced from the inner side wall of the third outer guide plate to form the liquid inlet area; The diverter member includes a diverter outer peripheral surface, a diverter bottom surface and a diverter top surface, the diverter top surface and the diverter bottom surface are arranged at intervals along the first direction, the diverter outer peripheral surface connects the diverter top surface and the diverter bottom surface, the diverter bottom surface is connected to the second body, the size of the diverter top surface is smaller than the size of the diverter bottom surface, the diverter outer peripheral surface includes a connecting surface and a diverter guide surface that are interconnected along the periphery of the diverter member, the connecting surface is connected to the inner side surface of the third outer guide plate, the diverter guide surface is a conical surface, and the diverter guide surface faces the third inner guide plate.

9. The pallet according to any one of claims 1 to 5, characterized in that: The second body is provided with a plurality of mounting grooves for clamping the battery cells in the battery module.

10. The pallet according to claim 9, characterized in that A first pressure relief hole is formed at the bottom of the installation groove, and the first pressure relief hole penetrates through the second body.

11. The pallet according to claim 9, characterized in that Second groove groups are respectively arranged on both end surfaces of the second body along the third direction, each of the second groove groups includes a plurality of second grooves spaced apart along the second direction, and the second grooves are recessed toward the area between two adjacent mounting grooves.

12. The pallet according to any one of claims 1 to 5, characterized in that: The second body has a circle of connecting protrusions protruding in an annular manner around it. The connecting protrusions and the third guide assembly are located on the same side of the second body. The connecting protrusions are recessed with a card slot configured to card-engage the box body of the battery box.

13. A battery box, characterized in that: include: A box body, wherein a liquid inlet and a liquid outlet are arranged at intervals on the box body, a receiving cavity is arranged in the box body, an opening is arranged at one end of the box body along the first direction, the opening is connected to the receiving cavity, and the liquid inlet and the liquid outlet are also connected to the receiving cavity; A tray, wherein the tray is the tray according to any one of claims 1 to 12, wherein the tray blocks the opening, and the liquid inlet area, the third guide assembly and the guide plate on the tray are all arranged in the accommodating cavity, wherein the liquid inlet is directly opposite to the liquid inlet area of ​​the tray.

14. A battery pack, comprising a battery module and a battery box, wherein the battery module is sealed and installed in the battery box, characterized in that: The battery case is the battery case as claimed in claim 13.

15. The battery pack according to claim 14, characterized in that: The battery module has multiple rows of battery cell groups arranged along the third direction, each row of the battery cell groups includes multiple battery cells arranged along the second direction, two adjacent rows of the battery cell groups are staggered, and the battery cells are cylindrical battery cells.

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