Battery box body and battery pack

Abstract

The utility model discloses a battery box and a battery pack, the battery box comprises a box body, a first liquid cooling plate and a second liquid cooling plate, an accommodating cavity is arranged in the box body, and the first liquid cooling plate and the second liquid cooling plate are respectively positioned on two sides of the accommodating cavity along a first direction; a plurality of first flow channels are distributed in the first liquid cooling plate, the length of each first flow channel extends in the third direction, and the first liquid cooling plate is provided with a plurality of first immersion holes communicating with the first flow channels and the containing cavity; a plurality of second flow channels are distributed in the second liquid cooling plate, the length of each second flow channel extends in the third direction, and the second liquid cooling plate is provided with a plurality of second immersion holes communicating with the second flow channels and the containing cavity; and a liquid inlet and a liquid outlet are formed in the battery box body and are respectively communicated with the first flow channel and the second flow channel. According to the battery box body, the probability that each battery cell is in contact with cooling liquid can be increased, the heat exchange uniformity and effect of all the battery cells are improved, and the service life of the battery cells is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery box and a battery pack comprising the battery box. Background Art

[0002] A battery pack generally includes a battery case and a battery module disposed in the battery case. The battery module is formed by a number of cells arranged in a set manner. The heat dissipation of the battery pack is extremely important. The heat dissipation effect directly affects the service life of the battery pack. Currently, the battery pack adopts air cooling, water cooling plate cooling and immersion cooling liquid cooling. For the immersion cooling liquid heat dissipation method, the coolant is directly sent into the battery case to contact with the battery cell shell for heat exchange. At present, this heat dissipation method generally sets a liquid inlet at one end of the length direction of the battery case and a liquid outlet at the other end. The coolant is introduced into the liquid inlet, and the coolant immerses the battery cell and then flows out from the liquid outlet. The coolant is cooled on the outside of the battery case and then transported to the liquid inlet after cooling. This cycle is repeated to cool the battery cell of the battery module.

[0003] The prior art has the following defects: after the coolant enters the battery case, the position close to the liquid inlet can be exposed to more coolant with a lower temperature, while the position far from the liquid inlet is less exposed or even cannot be exposed to the coolant with a lower temperature, resulting in some battery cells in the battery case not being immersed in the coolant with a lower temperature. These battery cells are prone to poor heat exchange, and battery cells with poor heat exchange will age prematurely and reduce their capacity, thereby reducing the service life of the battery pack. Utility Model Content

[0004] The purpose of the embodiments of the 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.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] In a first aspect, a battery box is provided, comprising a box body, a first liquid cooling plate and a second liquid cooling plate, wherein the box body has a receiving cavity for receiving a battery module, and the first liquid cooling plate and the second liquid cooling plate are respectively located on both sides of the receiving cavity along a first direction;

[0007] A plurality of first flow channels are distributed along the second direction in the first liquid cooling plate, the length of each first flow channel extends along the third direction, a plurality of first immersion holes are provided on a side of the first liquid cooling plate facing the accommodating cavity, all of the first immersion holes are connected to the first flow channel and the accommodating cavity, and all of the first immersion holes connected to the same first flow channel are arranged at intervals along the third direction;

[0008] A plurality of second flow channels are distributed along the second direction in the second liquid cooling plate, the length of each second flow channel extends along the third direction, a plurality of second immersion holes are provided on a side of the second liquid cooling plate facing the accommodating cavity, all of the second immersion holes are connected to the second flow channel and the accommodating cavity, all of the second immersion holes connected to the same second flow channel are arranged at intervals along the third direction, and the first direction, the second direction and the third direction are arranged at an angle to each other;

[0009] The battery box is also provided with a liquid inlet and a liquid outlet, the liquid outlet is communicated with the first flow channel, and the liquid inlet is communicated with the second flow channel.

[0010] In a second aspect, a battery pack is provided, comprising a battery module and the battery case, wherein the battery module is sealed and installed in the battery case.

[0011] Beneficial effect: by arranging the first liquid cooling plate and the second liquid cooling plate on the opposite sides of the accommodating cavity along the first direction, after the coolant enters the second flow channel from the liquid inlet, it is first diverted, and then enters the accommodating cavity through the second immersion hole to perform immersion heat exchange and heat dissipation on the battery module. Since the second flow channels are distributed in plurality along the second direction, and the length direction of each second flow channel extends along the third direction, the second immersion holes are distributed on the entire surface of the second liquid cooling plate, and the coolant entering the accommodating cavity can be quickly diverted to various positions of the battery module, thereby increasing the probability of each battery cell of the battery module contacting the coolant, improving the uniformity of heat dissipation, and extending the service life of the battery cell. The multiple first immersion holes on the first liquid cooling plate can quickly introduce the coolant that has completed heat exchange at various positions of the battery module into the first flow channel, and finally discharge it to the outside of the battery box through the liquid outlet, thereby reducing the residence time of the high-temperature coolant in the accommodating cavity, and avoiding the problem of low heat dissipation efficiency of the battery module near the first immersion hole due to mixed flow. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The utility model is further described in detail below based on the drawings and embodiments.

[0013] Figure 1 It is a three-dimensional schematic diagram of a battery box according to an embodiment of the utility model.

[0014] Figure 2 It is a schematic diagram of the exploded view of the battery box of an embodiment of the utility model.

[0015] Figure 3 This is a three-dimensional schematic diagram from one perspective of a first liquid cooling plate according to an embodiment of the present invention.

[0016] Figure 4 This is a three-dimensional schematic diagram from another perspective of the first liquid cooling plate of an embodiment of the utility model.

[0017] Figure 5 This is a schematic diagram of an exploded view of the first liquid cooling plate of an embodiment of the present utility model.

[0018] Figure 6 This is a three-dimensional schematic diagram from one perspective of a second liquid cooling plate according to an embodiment of the present invention.

[0019] Figure 7 This is a three-dimensional schematic diagram from another perspective of the second liquid cooling plate of an embodiment of the utility model.

[0020] Figure 8 This is a schematic diagram of an exploded view of the second liquid cooling plate of an embodiment of the present utility model.

[0021] Fig. 9 It is a bottom view schematically showing the second liquid cooling plate of an embodiment of the present utility model (the second sealing plate 37 is not shown).

[0022] Fig.10 This is a schematic structural diagram of a battery pack according to an embodiment of the utility model (the first liquid cooling plate is not shown).

[0023] Fig.11 It is a schematic diagram of an exploded view of a battery pack according to an embodiment of the present utility model.

[0024] Fig.12 It is a bottom view schematic diagram of a battery pack according to an embodiment of the utility model (the second liquid cooling plate is not shown).

[0025] Fig.13 It is a cross-sectional schematic diagram of a battery pack according to an embodiment of the present utility model.

[0026] Fig.14 Another cross-sectional schematic diagram of the battery pack according to the embodiment of the present utility model.

[0027] In the figure:

[0028] 100. Battery box;

[0029] 1. Box body; 11. Accommodation cavity;

[0030] 2. first liquid cooling plate; 21. first flow channel; 22. first immersion hole; 23. first sub-collecting channel; 24. first total collecting channel; 25. first substrate; 26. first sealing plate;

[0031] 3. second liquid cooling plate; 31. second flow channel; 32. second immersion hole; 33. second sub-collecting channel; 34. second total collecting channel; 35. flow dividing member; 351. flow dividing guide surface; 36. second substrate; 37. second sealing plate; 38. liquid inlet member; 381. liquid inlet channel; 39. limiting convex portion;

[0032] 4. Liquid inlet; 5. Liquid outlet; 6. Liquid inlet connector; 7. Liquid outlet connector;

[0033] 200, battery module; 210, battery cell group; 211, battery cell; 220, flow guide gap. DETAILED DESCRIPTION

[0034] In order to make the technical problems solved by the utility model, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the embodiments of the utility model will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0035] like Figure 1 As shown, an embodiment of the utility model provides a battery box 100. In this embodiment, the first direction is the vertical direction, the second direction is the width direction of the battery box 100, and the third direction is the length direction of the battery box 100.

[0036] like Figure 1 As shown (and see the attached Fig.10 and attached Fig.12 ), the following takes the battery cell 211 of the battery module 200 installed in the battery box 100 as a cylindrical battery cell 211 as an example for explanation, the battery cell 211 is not limited to a cylindrical battery cell 211, and can also be square, polygonal or irregular. The specific structure of the battery cell 211 is not limited, and the arrangement of the battery cell 211 is adaptively adjusted according to the specific shape of the battery cell 211, which will not be repeated here.

[0037] In this embodiment, if Figures 1 to 9 As shown (see attached Figures 10 to 14), the battery box 100 includes a box body 1, a first liquid cooling plate 2 and a second liquid cooling plate 3, the box body 1 has a receiving cavity 11 for receiving the battery module 200, and the first liquid cooling plate 2 and the second liquid cooling plate 3 are respectively located on both sides of the receiving cavity 11 along the first direction. Among them, multiple first flow channels 21 are distributed along the second direction in the first liquid cooling plate 2, and the length of each first flow channel 21 extends along the third direction. Multiple first immersion holes 22 are opened on a side of the first liquid cooling plate 2 facing the accommodating cavity 11, all the first immersion holes 22 are connected to the first flow channel 21 and the accommodating cavity 11, and all the first immersion holes 22 connected to the same first flow channel 21 are arranged at intervals along the third direction. Multiple second flow channels 31 are distributed along the second direction in the second liquid cooling plate 3, and the length of each second flow channel 31 extends along the third direction. Multiple second immersion holes 32 are opened on a side of the second liquid cooling plate 3 facing the accommodating cavity 11, all the second immersion holes 32 are connected to the second flow channel 31 and the accommodating cavity 11, and all the second immersion holes 32 connected to the same second flow channel 31 are arranged at intervals along the third direction. The battery box 100 is also provided with a liquid inlet 4 and a liquid outlet 5, the liquid outlet 5 is connected to the first flow channel 21, and the liquid inlet 4 is connected to the second flow channel 31.

[0038] Reference Fig.14 , the direction indicated by the arrow is the direction of the coolant flow. The battery case 100 of the utility model embodiment is provided with a first liquid cooling plate 2 and a second liquid cooling plate 3 on opposite sides of the accommodating cavity 11 along the first direction. After the coolant enters the second flow channel 31 from the liquid inlet 4, it is first divided, and then enters the accommodating cavity 11 through the second immersion hole 32 to perform immersion heat exchange and heat dissipation on the battery module 200. Since the second flow channels 31 are distributed in plurality along the second direction, the length direction of each second flow channel 31 extends along the third direction, so that the second immersion holes 32 are distributed on the entire surface of the second liquid cooling plate 3, and the coolant enters the accommodating cavity 11. The cooling liquid in the first liquid cold plate 2 can be quickly diverted to various positions of the battery module 200, which increases the probability of each battery cell 211 of the battery module 200 contacting the cooling liquid, improves the heat dissipation uniformity, and prolongs the service life of the battery cell 211. The multiple first immersion holes 22 on the first liquid cold plate 2 can quickly introduce the cooling liquid that has completed heat exchange at various positions of the battery module 200 into the first flow channel 21, and finally discharge it to the outside of the battery box 100 through the liquid outlet 5, thereby reducing the residence time of the high-temperature cooling liquid in the accommodating cavity 11 and avoiding the problem of low heat dissipation efficiency of the battery module 200 near the first immersion hole 22 due to mixed flow.

[0039] In this embodiment, the first liquid cooling plate 2 is located above the second liquid cooling plate 3. This design allows the coolant to first enter the second liquid cooling plate 3 below, and then enter the accommodating cavity 11, immersing the battery cell 211 of the battery module 200 from the bottom to the top, dissipating the heat of the battery cell 211, and finally collecting to the first flow channel 21 in the first liquid cooling plate 2 through the first immersion hole 22 on the first liquid cooling plate 2 above, and finally discharged through the liquid outlet 5. The bottom-to-top convection method makes the cooling path length of the battery cell 211 at each position of the battery module 200 that the coolant flows through almost the same, and the uniform length of the path makes the heat dissipation effect of the battery cell 211 more uniform, extending the service life of the entire battery module 200. Of course, it is not limited to setting the first liquid cooling plate 2 above the second liquid cooling plate 3. The positions of the two can also be interchanged, that is, the second liquid cooling plate 3 is set above the first liquid cooling plate 2 to achieve up and down convection, and the heat dissipation effect is consistent with the effect when the first liquid cooling plate 2 is located above the second liquid cooling plate 3.

[0040] Optionally, the liquid inlet 4 and the liquid outlet 5 are located on the same side of the battery case 100 along the first direction. By arranging the liquid inlet 4 and the liquid outlet 5 on the same side of the battery case 100 along the first direction, that is, both are arranged on the upper side or the lower side of the battery case 100, the liquid inlet 4 and the liquid outlet 5 will not occupy the space in the horizontal direction of the battery case 100, and the battery case 100 is arranged more tightly, which increases the space utilization. Preferably, the liquid inlet 4 and the liquid outlet 5 are both arranged on the first liquid cooling plate 2. When the liquid inlet 4 and the liquid outlet 5 are both located on the upper surface of the battery case 100, it is convenient to connect and maintain the external battery case 100, and there is no need to make a avoidance structure at the bottom of the battery case 100, which is simpler in structural design. More preferably, the liquid inlet 4 and the liquid outlet 5 are both adjacent to one end of the battery case 100 along the third direction, which can shorten the length of the pipe in the battery case 100, save costs, and reduce the space occupancy rate in the battery case 100.

[0041] In other embodiments, the liquid inlet 4 and the liquid outlet 5 are not limited to being arranged on the same side of the battery case 100, but may also be arranged on different sides, for example, the liquid inlet 4 is arranged on the lower side of the battery case 100, that is, the liquid inlet 4 is arranged on the second liquid cooling plate 3, and the liquid outlet 5 is arranged on the upper side of the battery case 100, that is, the liquid outlet 5 is arranged on the first liquid cooling plate 2. Alternatively, the liquid inlet 4 and the liquid outlet 5 are arranged on the left and right sides or the front and rear sides of the battery case 100.

[0042] Furthermore, if Figure 2 , Figure 6 , Figures 8 to 10 (Combined with the attached Fig.13 and attached Fig.14), the liquid inlet 4 is connected to the second liquid cooling plate 3 through the liquid inlet channel 381. Since the liquid inlet 4 and the liquid outlet 5 are both arranged on the first liquid cooling plate 2, the second liquid cooling plate 3 cannot be directly connected to the liquid inlet 4, so a liquid inlet channel 381 is provided as a transition to connect the liquid inlet 4 and the second liquid cooling plate 3. Optionally, a liquid inlet member 38 is provided in the accommodating chamber 11, and the liquid inlet member 38 is connected to the first liquid cooling plate 2 and the second liquid cooling plate 3 respectively, and the liquid inlet channel 381 is provided in the liquid inlet member 38, the liquid inlet 4 passes through the first liquid cooling plate 2 and is connected to the liquid inlet channel 381, the liquid inlet 4 is spaced from the first flow channel 21, and the liquid inlet channel 381 is connected to all the second flow channels 31. By providing the liquid inlet 38 and arranging the liquid inlet 38 in the accommodating chamber 11, the length of the liquid inlet 38 can be shortened as much as possible while ensuring that the liquid inlet port 4 is connected to the second flow channel 31, thereby reducing the space occupied by the components. Moreover, the short length of the liquid inlet 38 makes the length of the liquid inlet channel 381 short, thereby reducing the influence of the coolant that has undergone heat exchange in the accommodating chamber 11 on the coolant in the liquid inlet channel 381. In other embodiments, the liquid inlet 38 can also be arranged outside the accommodating chamber 11, that is, the liquid inlet 38 is arranged outside the box body 1, which can further reduce the influence of the coolant that has undergone heat exchange in the accommodating chamber 11 on the coolant in the liquid inlet channel 381.

[0043] Optionally, the liquid inlet 38 is fixedly connected to the second liquid cooling plate 3. The liquid inlet 38 is fixedly connected to the second liquid cooling plate 3, which can reduce the difficulty of assembling the liquid inlet 38 and prevent the liquid inlet 38 from moving in the accommodating chamber 11. Preferably, the liquid inlet 38 and the second liquid cooling plate 3 can be formed in an integral manner, such as integral injection molding or integral casting. The integral molding method can reduce the difficulty of manufacturing, and there is no need to consider the sealing problem at the connection position between the liquid inlet 38 and the second liquid cooling plate 3, which effectively prevents the heat-exchanged coolant in the accommodating chamber 11 from entering the liquid inlet channel 381 of the liquid inlet 38. The upper end of the liquid inlet 38 is pressed against a side surface of the first liquid cooling plate 2 located in the accommodating chamber 11, and a sealing ring can be provided at the pressing position, and the sealing ring surrounds the liquid inlet 4 to ensure that the coolant entering the liquid inlet 4 will not leak into the accommodating chamber 11 from the position where the liquid inlet 38 and the first liquid cooling plate 2 are pressed against each other. In other embodiments, the liquid inlet member 38 may be manufactured separately from the second liquid cooling plate 3 and then assembled with the second liquid cooling plate 3 by means of screws, buckles, bonding, etc.

[0044] In addition, the battery box 100 is also provided with a liquid inlet joint 6 and a liquid outlet joint 7. The liquid inlet joint 6 is provided corresponding to the liquid inlet 4, and the liquid outlet joint 7 is provided corresponding to the liquid outlet 5. The liquid inlet joint 6 and the liquid outlet joint 7 are used to connect the external pipeline to realize the circulation cooling of the coolant. The liquid inlet joint 6 and the liquid outlet joint 7 can be in the form of quick-disconnect joints to realize the quick disassembly and assembly of the external pipeline.

[0045] In one embodiment, the battery module 200 has multiple rows of battery cell groups 210 arranged along the second direction, each row of battery cell groups 210 includes multiple battery cells 211 arranged along the third direction, and a flow guide gap 220 is formed between at least two adjacent rows of battery cell groups 210, wherein each flow guide gap 220 corresponds to a first flow channel 21 and a second flow channel 31. By setting the first flow channel 21 on the first liquid cooling plate 2 and the second flow channel 31 on the second liquid cooling plate 3 to correspond to the guide gap 220 of the battery module 200, after the second immersion hole 32 on the second flow channel 31 introduces the coolant into the accommodating cavity 11, the coolant directly enters each guide gap 220, thereby increasing the chance of each battery cell 211 of each row of battery cell groups 210 contacting the coolant, thereby avoiding the problem of low local heat exchange efficiency of the battery cell 211, and the first immersion hole 22 on the first flow channel 21 can recover the coolant after heat exchange in the guide gap 220, thereby accelerating the discharge of the coolant after heat exchange to the outside of the battery case 100, and reducing the time the coolant stays in the accommodating cavity 11.

[0046] Optionally, a flow guide gap 220 is also formed between the two sides of the battery module 200 along the second direction and the box body 1. Of course, the flow guide gap 220 at this position will also be provided with a first flow channel 21 and a second flow channel 31 corresponding thereto. This design enables the battery cells 211 at both sides of the battery module 200 along the second direction to also be exposed to the coolant at a lower temperature, thereby ensuring uniform heat exchange of the battery cells 211 at this position.

[0047] Preferably, the plurality of first immersion holes 22 and the plurality of second immersion holes 32 are arranged in one-to-one correspondence, that is, the first immersion holes 22 and the second immersion holes 32 are not only the same in number, but also the first immersion holes 22 and the second immersion holes 32 are at least partially overlapped in projection along the first direction. By arranging the plurality of first immersion holes 22 and the plurality of second immersion holes 32 in one-to-one correspondence, the coolant can form a convection effect of downward and upward flow in the guide gap 220, accelerate the heat dissipation and the discharge of the coolant after heat exchange, and improve the heat dissipation effect.

[0048] In this embodiment, the size of the first immersion hole 22 is consistent with the size of the second immersion hole 32, and the two are located opposite each other. This design allows the amount of liquid introduced into the accommodating cavity 11 by the second immersion hole 32 and the amount of liquid discharged from the accommodating cavity 11 by the first immersion hole 22 to be consistent, thereby reducing the disturbance of the coolant in the accommodating cavity 11 and avoiding the phenomenon of mixed flow.

[0049] Optionally, the first immersion hole 22 is a circular hole. In other embodiments, the first immersion hole 22 may also be at least one of a semicircular hole, an elliptical hole, a square hole, a polygonal hole, and a special-shaped hole. For example, the first liquid cooling plate 2 has both a circular hole-shaped first immersion hole 22 and a semicircular hole-shaped first immersion hole 22.

[0050] The second immersion hole 32 is a circular hole. In other embodiments, the second immersion hole 32 may also be at least one of a semicircular hole, an elliptical hole, a square hole, a polygonal hole, and a special-shaped hole. For example, the second liquid cooling plate 3 has both a circular second immersion hole 32 and a semicircular second immersion hole 32.

[0051] In one embodiment, if Figure 5 As shown (the reference numerals are the same as those in the attached Figures 1 to 4 , Attachment Figures 6 to 14 ), a first sub-collecting channel 23 and a first total collecting channel 24 are arranged in the first liquid cooling plate 2, and a plurality of first sub-collecting channels 23 are distributed along the second direction, each first sub-collecting channel 23 is connected to at least two first flow channels 21, all first sub-collecting channels 23 are connected to the first total collecting channel 24, and the first total collecting channel 24 is connected to the liquid outlet 5. By arranging the first sub-collecting channel 23, the coolant in the first flow channel 21 can be collected, and all the first sub-collecting channels 23 are connected to a first total collecting channel 24, and the first total collecting channel 24 can be used to collect the coolant in all the first sub-collecting channels 23, and finally facilitate the coolant to be discharged from the liquid outlet 5. Optionally, the length of the first sub-collecting channel 23 extends along the second direction, and the length of the first total collecting channel 24 also extends along the second direction, so that the first sub-collecting channel 23 can cover the area of ​​all the first flow channels 21 that need to be connected as much as possible, and the first total collecting channel 24 can cover the area of ​​all the first sub-collecting channels 23 that need to be connected. The number of first flow channels 21 connected to each first sub-collecting channel 23 is the same. For example, if the battery module 200 has eight rows of battery cell groups 210, there will be nine flow guide gaps 220, and the number of corresponding first flow channels 21 is also nine. Then three first sub-collecting channels 23 can be set, and each first sub-collecting channel 23 is connected to three first flow channels 21. Finally, the three first sub-collecting channels 23 are connected to the first main collecting channel 24. Try to make each first flow channel 21 connected to only one first sub-collecting channel 23.

[0052] like Figure 8 and Fig. 9 As shown (the reference numerals are the same as those in the attached Figures 1 to 7 , Attachment Figures 10 to 14), a second sub-collecting channel 33 and a second total collecting channel 34 are arranged in the second liquid cooling plate 3, and a plurality of second sub-collecting channels 33 are distributed along the second direction, each second sub-collecting channel 33 is connected to at least two second flow channels 31, and all second sub-collecting channels 33 are connected to the second total collecting channel 34, and the second total collecting channel 34 is connected to the liquid inlet 4. By setting the second total collecting channel 34, the cooling liquid from the liquid inlet 4 can be received, and then the cooling liquid is evenly distributed to each second sub-collecting channel 33 through the second total collecting channel 34 to achieve the first flow diversion, and the second sub-collecting channel 33 will evenly distribute the cooling liquid to each second flow channel 31 connected thereto to achieve the second flow diversion, and the cooling liquid after the two diversions will then evenly enter the accommodating cavity 11 through the second immersion hole 32 to enter the flow guide gap 220 to evenly dissipate the heat of each battery cell 211, thereby improving the uniformity of heat dissipation. Optionally, the length of the second sub-collecting channel 33 extends along the second direction, and the length of the second total collecting channel 34 also extends along the second direction, so that the second sub-collecting channel 33 can cover the area of ​​the second flow channel 31 that needs to be connected as much as possible, and the second total collecting channel 34 can cover the area of ​​all second sub-collecting channels 33 that need to be connected, so as to achieve a uniform flow diversion effect. As in the example above, if the battery module 200 has eight rows of battery cell groups 210, the number of second flow channels 31 is also nine, and three second sub-collecting channels 33 can be set, each second sub-collecting channel 33 is connected to three second flow channels 31, and finally the three second sub-collecting channels 33 are connected to the second total collecting channel 34. Try to make each second flow channel 31 connected to only one second sub-collecting channel 33.

[0053] Of course, the number of first flow channels 21 connected to all first sub-collecting channels 23 is not limited to being consistent, and may also be inconsistent. For example, one first sub-collecting channel 23 connects two first flow channels 21 , and one first sub-collecting channel 23 connects three first flow channels 21 .

[0054] The number of second flow channels 31 connected to all second sub-collecting channels 33 is not limited to being the same, but may be different. For example, one second sub-collecting channel 33 is connected to two second flow channels 31 , and one second sub-collecting channel 33 is connected to three second flow channels 31 .

[0055] The configuration is not limited to the first sub-collecting channel 23 and the second sub-collecting channel 33 . The first total collecting channel 24 may be directly provided to connect all the first flow channels 21 , and the second total collecting channel 34 may be provided to connect all the second flow channels 31 .

[0056] In this embodiment, if Fig.13 As shown (the reference numerals are the same as those in the attached Figures 1 to 12), the second total collecting channel 34 has a liquid inlet area facing the liquid inlet 4, and a diverter 35 is arranged in the liquid inlet area. The outer wall of the diverter 35 is at least partially an arc surface, and the cross-sectional dimension of one end of the diverter 35 close to the liquid inlet 4 is smaller than the cross-sectional dimension of the end of the diverter 35 away from the liquid inlet 4. By setting up the diverter 35, the coolant delivered from the liquid inlet 4 can be diverted to prevent the coolant from accelerating to a certain second sub-collecting channel 33. The diverter 35 first pre-diverts the coolant, and then the diverted coolant can be basically evenly delivered to each second sub-collecting channel 33, ensuring that the amount of coolant at the same temperature in each second flow channel 31 remains consistent, so that each guide gap 220 can obtain coolant with the same temperature and basically the same flow rate, so that the cooling effect of each battery cell 211 is the same, the temperature difference of the battery cell 211 is reduced, and the service life of the entire battery module 200 is extended; by providing the outer wall of the diverter 35 with an arc surface, the splashing of the coolant delivered from the liquid inlet 4 at the diverter 35 can be reduced, ensuring that the coolant can be diverted by adhering to the outer wall of the diverter 35, and the structure with a small upper end and a large lower end can form a better diversion effect, and the lower end of the diverter 35 forms a dispersed structure to ensure that the coolant can be evenly diverted.

[0057] Further, the flow divider 35 includes a flow divider outer peripheral surface, a flow divider bottom surface and a flow divider top surface, the flow divider top surface and the flow divider bottom surface are arranged at intervals along the first direction, the flow divider outer peripheral surface connects the flow divider top surface and the flow divider bottom surface, the flow divider bottom surface connects the bottom surface of the second total collection channel 34, the size of the flow divider top surface is smaller than the size of the flow divider bottom surface, that is, the flow divider top surface is closer to the liquid inlet 4, and the flow divider bottom surface is farther from the liquid inlet 4, the flow divider outer peripheral surface includes a connecting surface and a flow divider guide surface 351 connected to each other along the periphery of the flow divider 35, the connecting surface is connected to the inner side surface of the second total collection channel 34, the flow divider guide surface 351 is a conical surface, and the flow divider guide surface 351 faces the second sub-collection channel 33. The structural form of the flow divider 35 is actually a half structure of a cone cut in half along the direction of its own central axis. By setting a connecting surface on the diverter outer peripheral surface of the diverter 35, this connecting surface can be connected to the inner wall of the second total collecting channel 34 (the connecting surface is not exposed behind the connecting surface, and the structural form of the connecting surface is consistent with the structural form of the inner wall of the second total collecting channel 34, so that this position can fit tightly after the connection), and the diverter guide surface 351 of the conical structure is exposed on the diverter 35, and the conical structure is used to divert the coolant from top to bottom. The conical structure minimizes the resistance and splashing of the coolant, ensuring that the coolant is gradually dispersed from the smaller diverter top surface to the larger diverter bottom surface along the conical structure, and the dispersed coolant then enters the second sub-collecting channel 33. At this time, the coolant will be more evenly distributed in each second sub-collecting channel 33.

[0058] In one embodiment, the box body 1 is provided with a first opening and a second opening on both sides along the first direction, the first liquid cooling plate 2 is connected to the box body 1 and blocks the first opening, and the second liquid cooling plate 3 is connected to the box body 1 and blocks the second opening. Directly providing a liquid cooling plate to block the opening on the box body 1 can save the need to provide an additional top plate and bottom plate to block the opening of the box body 1, reduce the number of parts, save space in the battery box 100, improve the energy density of the battery module 200 in the battery box 100, and save the top plate and bottom plate, and reduce the overall weight of the battery box 100, thereby reducing the weight of the entire battery pack.

[0059] Alternatively, if Figures 3 to 5 (The reference numerals shall remain the same as in the attached Figures 1 to 2 , attached Figures 6 to 14 ), the first liquid cooling plate 2 includes a first substrate 25 and a first sealing plate 26, a first groove is recessed on one side of the first substrate 25, a side of the first substrate 25 provided with the first groove is connected to the first sealing plate 26, the first sealing plate 26 blocks the notch of the first groove to form a first flow channel 21 built into the first liquid cooling plate 2, and the first immersion hole 22 is provided on the first substrate 25 or the first sealing plate 26. By manufacturing the first liquid cooling plate 2 in steps using the first substrate 25 and the first sealing plate 26 and then assembling them, it is convenient to form the first flow channel 21 and the first immersion hole 22, and the manufacturing difficulty can be reduced. Preferably, the first sealing plate 26 is provided on a side of the first substrate 25 facing the inside of the accommodating cavity 11, so that the first immersion hole 22 is provided on the first sealing plate 26.

[0060] like Figures 6 to 9 (The reference numerals shall remain the same as in the attached Figures 1 to 5 , attached Figures 10 to 14 ), the second liquid cooling plate 3 includes a second substrate 36 and a second sealing plate 37, a side of the second substrate 36 is recessed with a second groove, a side of the second substrate 36 provided with the second groove is connected to the second sealing plate 37, the second sealing plate 37 blocks the notch of the second groove to form a second flow channel 31 built into the second liquid cooling plate 3, and the second immersion hole 32 is opened on the second substrate 36 or the second sealing plate 37. By manufacturing the second liquid cooling plate 3 in steps using the second substrate 36 and the second sealing plate 37 and then assembling them, it is convenient to form the second immersion hole 32, and the manufacturing difficulty can be reduced. Preferably, the second sealing plate 37 is arranged on a side of the second substrate 36 away from the inside of the accommodating cavity 11, so that the second immersion hole 32 is opened on the second substrate 36.

[0061] Furthermore, the liquid inlet member 38 , the flow diverter member 35 and the second substrate 36 are integrally manufactured and formed. When the second sealing plate 37 is assembled on the second substrate 36 , the flow diverter bottom surface of the flow diverter member 35 is pressed tightly against a side surface of the second sealing plate 37 close to the second substrate 36 .

[0062] The first substrate 25 is also provided with grooves at positions corresponding to the first sub-collecting channel 23 and the first total collecting channel 24 . After the first sealing plate 26 is installed on the first substrate 25 , the grooves are blocked to form the first sub-collecting channel 23 and the first total collecting channel 24 .

[0063] The second substrate 36 is also provided with a recessed groove at a position corresponding to the second sub-collecting channel 33 and the second total collecting channel 34 . After the second sealing plate 37 is installed on the second substrate 36 , the recessed groove is blocked to form the second sub-collecting channel 33 and the second total collecting channel 34 .

[0064] In addition, a limiting protrusion 39 is also protruded from a side of the second substrate 36 away from the second sealing plate 37. The limiting protrusion 39 and the liquid inlet 38 are located on the same side of the second substrate 36, and the limiting protrusion 39 and the liquid inlet 38 are respectively adjacent to the two ends of the second substrate 36 along the third direction. The setting of this limiting protrusion 39 is mainly to fill the space between the battery module 200 and the inner wall of the box body 1 to prevent the battery module 200 from moving along the third direction in the accommodating cavity 11. In this embodiment, the liquid inlet 38, the second substrate 36 and the limiting protrusion 39 are integrally manufactured and formed. The three are made into an integrated structure for easy installation.

[0065] Optionally, the sum of the areas of all the first immersion holes 22 is S1, the sum of the cross-sectional areas of all the first flow channels 21 along the second direction is S2, and the relationship ratio between S1 and S2 may satisfy 3:50 or 1:10. For example, the relationship ratio between S1 and S2 may be 3:50, 3:43, 3:37.5, 3:33, 1:10, etc.; the sum of the areas of all the second immersion holes 32 is S3, the sum of the cross-sectional areas of all the second flow channels 31 along the second direction is S4, and the relationship ratio between S3 and S4 may satisfy 3:50 or 1:10. For example, the relationship ratio between S1 and S2 may be 3:50, 3:43, 3:37.5, 3:33, 1:10, etc.

[0066] The area of ​​the battery module 200 is S6, wherein the ratio of S1, S2 and S6 can satisfy 13:120:45500 or 13:130:45500, and the ratio of S3, S4 and S6 can also satisfy 13:120:45500 or 13:130:45500. The area of ​​the first immersion hole 22 and the second immersion hole 32 needs to be controlled and cannot be too large, otherwise it will affect the convection effect.

[0067] like Figures 10 to 14 As shown (part of the reference numerals are used in the attached Figures 1 to 9) An embodiment of the utility model further provides a battery pack, including a battery module 200 and a battery case 100, wherein the battery module 200 is sealed and installed in the battery case 100, wherein the battery case 100 is the battery case 100 of any of the above embodiments, and the structure of the battery case 100 is not described in detail herein.

[0068] In this embodiment, the battery module 200 has multiple rows of battery cell groups 210 arranged along the second direction, each row of battery cell groups 210 includes multiple battery cells 211 arranged along the third direction, and two adjacent rows of battery cell groups 210 are arranged in staggered rows. This design can make the battery module 200 more compact, ensure higher space utilization in the battery box 100, and the energy density of the battery pack formed after assembling the battery module 200 will be greater.

[0069] Preferably, the length of the battery cell 211 extends along the first direction.

[0070] The cooling method of the battery pack includes the following steps:

[0071] Step S100, providing cooling liquid, so that the cooling liquid enters the liquid inlet channel 381 of the liquid inlet member 38 from the liquid inlet port 4 of the battery box 100, and flows along the first direction to the diverter member 35 in the second main collecting channel 34, and the diverter member 35 diverts the cooling liquid, and then the cooling liquid enters the second sub-collecting channel 33;

[0072] Step S200, the coolant in the second sub-collecting channel 33 is further divided into each second flow channel 31, and the coolant in the second flow channel 31 enters the accommodating cavity 11 through the second immersion hole 32 and enters each guide gap 220 of the battery module 200, so as to immerse and dissipate heat for each battery cell 211 one by one;

[0073] Step S300, the coolant after heat exchange enters the first flow channel 21 through the first immersion hole 22;

[0074] In step S400 , the coolant in all the first flow channels 21 is first collected into the corresponding first sub-collecting channels 23 , and then the coolant in all the first sub-collecting channels 23 is collected into the first main collecting channel 24 and finally discharged to the outside of the battery box 100 through the liquid outlet 5 .

[0075] In addition, after the coolant is discharged into the battery case 100 , the coolant can be cooled by an external refrigeration device, and the cooled coolant is recirculated to the liquid inlet 4 to cool the battery module 200 in the battery case 100 again.

Claims

1. A battery box, characterized in that: It comprises a box body, a first liquid cooling plate and a second liquid cooling plate, wherein the box body has a receiving cavity for receiving a battery module, and the first liquid cooling plate and the second liquid cooling plate are respectively located on two sides of the receiving cavity along a first direction; A plurality of first flow channels are distributed along the second direction in the first liquid cooling plate, the length of each first flow channel extends along the third direction, a plurality of first immersion holes are provided on a side of the first liquid cooling plate facing the accommodating cavity, all of the first immersion holes are connected to the first flow channel and the accommodating cavity, and all of the first immersion holes connected to the same first flow channel are arranged at intervals along the third direction; A plurality of second flow channels are distributed along the second direction in the second liquid cooling plate, the length of each second flow channel extends along the third direction, a plurality of second immersion holes are provided on a side of the second liquid cooling plate facing the accommodating cavity, all of the second immersion holes are connected to the second flow channel and the accommodating cavity, all of the second immersion holes connected to the same second flow channel are arranged at intervals along the third direction, and the first direction, the second direction and the third direction are arranged at an angle to each other; The battery box is also provided with a liquid inlet and a liquid outlet, the liquid outlet is communicated with the first flow channel, and the liquid inlet is communicated with the second flow channel.

2. The battery box according to claim 1, characterized in that: The battery module has multiple rows of battery cell groups arranged along the second direction, each row of the battery cell groups includes multiple battery cells arranged along the third direction, and a flow-conducting gap is formed between at least two adjacent rows of the battery cell groups; Each of the flow-guiding gaps is correspondingly provided with one first flow channel and one second flow channel.

3. The battery box according to claim 2, characterized in that: The flow guiding gap is also formed between the two sides of the battery module along the second direction and the box body.

4. The battery box according to claim 2, characterized in that: The plurality of first immersion holes and the plurality of second immersion holes are arranged in one-to-one correspondence.

5. The battery case according to any one of claims 1 to 4, characterized in that: The first liquid cooling plate and the second liquid cooling plate are distributed in a vertical direction; The first liquid cooling plate is located above the second liquid cooling plate; or the second liquid cooling plate is located above the first liquid cooling plate.

6. The battery case according to any one of claims 1 to 4, characterized in that: The liquid inlet and the liquid outlet are located on the same side of the battery box along the first direction, the liquid inlet is connected to the second liquid cooling plate through a liquid inlet channel, and the liquid outlet is arranged on the first liquid cooling plate.

7. The battery case according to claim 6, characterized in that: A liquid inlet component is provided in the accommodating cavity, and the liquid inlet component is connected to the first liquid cooling plate and the second liquid cooling plate respectively. The liquid inlet channel is provided in the liquid inlet component, the liquid inlet port passes through the first liquid cooling plate and is connected to the liquid inlet channel, the liquid inlet port is spaced from the first flow channel, and the liquid inlet channel is connected to all the second flow channels.

8. The battery case according to claim 7, characterized in that: The liquid inlet component is fixedly connected to the second liquid cooling plate.

9. The battery case according to any one of claims 1 to 4, characterized in that: A first sub-collecting channel and a first total collecting channel are arranged in the first liquid cooling plate, and a plurality of first sub-collecting channels are distributed along the second direction, each of the first sub-collecting channels is connected to at least two of the first flow channels, all of the first sub-collecting channels are connected to the first total collecting channel, and the first total collecting channel is connected to the liquid outlet; and / or, A second sub-collecting channel and a second total collecting channel are arranged in the second liquid cooling plate, and a plurality of second sub-collecting channels are distributed along the second direction, each of the second sub-collecting channels is connected to at least two of the second flow channels, all of the second sub-collecting channels are connected to the second total collecting channel, and the second total collecting channel is connected to the liquid inlet.

10. The battery case according to claim 9, characterized in that: The first direction is a vertical direction, and the first liquid cooling plate is located above the second liquid cooling plate; The second total collecting channel has a liquid inlet area facing the liquid inlet, and a diverter is arranged in the liquid inlet area. The outer wall of the diverter is at least partially an arc surface, and the cross-sectional dimension of one end of the diverter close to the liquid inlet is smaller than the cross-sectional dimension of the end of the diverter away from the liquid inlet.

11. The battery case according to claim 10, characterized in that: The diverter component includes a diverter outer peripheral surface, a diverter bottom surface and a diverter top surface, the diverter top surface and the diverter bottom surface are spaced apart along a 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 bottom surface of the second total converging channel, 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 component, the connecting surface is connected to the inner side surface of the second total converging channel, the diverter guide surface is a conical surface, and the diverter guide surface faces the second sub-converging channel.

12. The battery case according to any one of claims 1 to 4, characterized in that: The first liquid cooling plate includes a first substrate and a first sealing plate, a side surface of the first substrate is sunken with a first groove, a side surface of the first substrate provided with the first groove is connected to the first sealing plate, the first sealing plate blocks a notch of the first groove to form the first flow channel, and the first immersion hole is provided on the first substrate or the first sealing plate; and / or, The second liquid cooling plate includes a second substrate and a second sealing plate, a side surface of the second substrate is recessed with a second groove, a side surface of the second substrate provided with the second groove is connected to the second sealing plate, the second sealing plate blocks the notch of the second groove to form the second flow channel, and the second immersion hole is opened on the second substrate or the second sealing plate.

13. The battery case according to any one of claims 1 to 4, characterized in that: The box body is provided with a first opening and a second opening on both sides along the first direction respectively, the first liquid cooling plate is connected to the box body and blocks the first opening, and the second liquid cooling plate is connected to the box body and blocks the second opening.

14. The battery case according to any one of claims 1 to 4, characterized in that: The sum of the areas of all the first immersion holes is S1, the sum of the cross-sectional areas of all the first flow channels along the second direction is S2, and the relationship ratio of S1 to S2 satisfies: 3:50 or 1:10; The sum of the areas of all the second immersion holes is S3, the sum of the cross-sectional areas of all the second flow channels along the second direction is S4, and the relationship ratio of S3 to S4 satisfies: 3:50 or 1:10; The area of ​​the battery module is S6; The relationship ratio of S1, S2 and S6 satisfies: 13:120:45500 or 13:130:45500; and / or, The relationship ratio of S3, S4 and S6 satisfies: 13:120:45500 or 13:130:45500.

15. 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 according to any one of claims 1 to 14.

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

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