Battery box body and battery pack

Abstract

The invention provides a battery box and a battery pack, the battery box comprises a first cooling plate, a shell and a second cooling plate, the first cooling plate is provided with a first cooling flow channel and comprises a cooling medium inlet communicated with the first cooling flow channel; the shell is provided with a cavity, and the cavity is used for accommodating the battery module; the second cooling plate is located in the cavity and is provided with a second cooling flow channel, and the second cooling flow channel communicates with the cavity; the first cooling plate is provided with a plurality of adjusting hole sets, one adjusting hole set comprises at least one flow adjusting hole, the first cooling flow channel is communicated with the cavity through the flow adjusting holes, and the hole diameters of the flow adjusting holes in the different adjusting hole sets are increased along with increasing of the distance between the adjusting hole sets and the cooling medium inlet. According to the battery box body and the battery pack provided by the invention, the flow of the cooling medium at different positions of the first cooling plate tends to be uniform, so that the occurrence probability of a'cold area 'and a'hot area' caused by local flow velocity difference is reduced.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to battery boxes and battery packs. Background Art

[0002] The internal structure of the battery pack is complex, and improper design of the coolant flow path can easily lead to local flow velocity differences, forming "cold zones" and "hot zones". Summary of the Invention

[0003] The embodiments of the present application provide a battery case and a battery pack that can optimize the coolant flow path and reduce the probability of the formation of "cold zones" and "hot zones" due to local flow velocity differences.

[0004] In a first aspect, an embodiment of the present application provides a battery box, the battery box comprising:

[0005] a first cooling plate having a first cooling channel and comprising a cooling medium inlet communicating with the first cooling channel;

[0006] A housing having a cavity for accommodating a battery module; and

[0007] A second cooling plate is located in the cavity and has a second cooling channel, the second cooling channel is connected to the cavity;

[0008] Among them, the first cooling plate has multiple adjustment hole groups, the adjustment hole group includes at least one flow adjustment hole, the first cooling channel is connected to the cavity through the flow adjustment hole, and the aperture size of the flow adjustment holes in different adjustment groups increases with the increase of the distance between the adjustment hole group and the cooling medium inlet.

[0009] In some embodiments of the present application, the second cooling plate further includes a cooling medium outlet, which is connected to the second cooling channel;

[0010] The flow path of the cooling medium entering from the cooling medium inlet is: the cooling medium inlet, the first cooling channel, the flow regulating hole, the cavity, the second cooling channel and the cooling medium outlet.

[0011] In some embodiments of the present application, the cooling medium flows through the cavity along the stacking direction of the first cooling plate and the second cooling plate.

[0012] In some embodiments of the present application, the first cooling plate includes a first cold plate, a second cold plate and a first flow channel plate, and the first flow channel plate is located between the first cold plate and the second cold plate; wherein, the first cooling flow channel is opened in the first flow channel plate, the first cold plate covers the first cooling flow channel, and the flow regulating hole is provided in the second cold plate.

[0013] In some embodiments of the present application, the regulating hole groups are distributed along a first direction, and each regulating hole group includes at least one flow regulating hole; in the first direction, a vertical distance from the cooling medium inlet to the Pth regulating hole group is less than a vertical distance from the cooling medium inlet to the Qth regulating hole group, and P and Q satisfy: 0<P<Q, and P and Q are positive integers;

[0014] The aperture of the flow regulating holes in the Pth regulating hole group is smaller than the aperture of the flow regulating holes in the Qth regulating hole group.

[0015] In some embodiments of the present application, the flow regulating holes in each regulating hole group have the same aperture size.

[0016] In some embodiments of the present application, the plurality of adjustment hole groups include a plurality of adjustment hole columns spaced apart along a first direction, each adjustment hole column includes a plurality of flow adjustment holes spaced apart along a second direction, and the second direction intersects the first direction;

[0017] The aperture D of the flow regulating holes in each regulating hole group depends on the sequence number of the nth regulating hole column farthest from the cooling medium inlet in each regulating hole group. The sequence number of the nth regulating hole column is n, and n is a positive integer.

[0018] In some embodiments of the present application, D=Round(k1*n3-k2*n2+k3*n); wherein k1, k2, and k3 are aperture adjustment coefficients, Round(·) represents rounding operation, and the unit of D is mm.

[0019] In some embodiments of the present application, D=Round(0.0002*n3-0.0097*n2+0.2784*n).

[0020] In some embodiments of the present application, the number of the first cooling plate, the second cooling plate, and the shell are all multiple, and one first cooling plate corresponds to one second cooling plate and one shell;

[0021] The cooling medium inlet is connected to the plurality of first cooling channels through a first pipeline, and / or the cooling medium outlet is connected to the plurality of second cooling channels through a second pipeline.

[0022] In some embodiments of the present application, the battery box further includes a frame having a plurality of fixing grooves, and each shell is fixed in a fixing groove.

[0023] In some embodiments of the present application, the second cooling plate includes a third cold plate and a second flow channel plate, the second flow channel plate is located on the side of the third cold plate away from the first cooling plate, the second cooling channel is opened in the second flow channel plate, and the third cold plate covers the second cooling channel; wherein, the third cold plate has a guide hole, and the guide hole connects the cavity and the second cooling channel.

[0024] In some embodiments of the present application, the distribution of the diameters of the flow guide holes of the third cold plate is the same as the distribution of the flow regulating holes of the second cold plate.

[0025] In some embodiments of the present application, the number of the flow regulating holes increases as the distance between the flow regulating holes and the cooling medium inlet increases.

[0026] In a second aspect, the present application further provides a battery pack, which includes: a battery case as described above; and a battery module housed in the cavity.

[0027] In some embodiments of the present application, each battery module includes a plurality of batteries, the plurality of batteries are arranged at intervals, and the position of the flow regulating hole is opposite to the gap between two adjacent batteries.

[0028] In some embodiments of the present application, each battery includes a pole, and the first cooling plate is arranged on a side of the pole away from the second cooling plate, and the first cooling plate covers the battery.

[0029] The battery case and battery pack provided by the present application, the battery case includes a first cooling plate, a shell and a second cooling plate, the first cooling plate has a first cooling channel and includes a cooling medium inlet connected to the first cooling channel; the shell has a cavity, the cavity is used to accommodate the battery module; the second cooling plate is located in the cavity and has a second cooling channel, the second cooling channel is connected to the cavity; wherein, the first cooling plate has a plurality of adjustment hole groups, one adjustment hole group includes at least one flow adjustment hole, the first cooling channel is connected to the cavity through the flow adjustment hole, and the aperture size of the flow adjustment holes in different adjustment hole groups increases as the distance between the adjustment hole group and the cooling medium inlet increases. If the aperture of the flow adjustment holes is exactly the same, the flow rate of the cooling medium at different positions of the first cooling plate will be large or small, and the farther the distance from the cooling medium inlet, the slower the flow rate of the cooling medium, and the flow rate of the cooling medium will decrease. The present application arranges flow regulating holes connected to the first cooling channel on the first cooling plate, and makes the aperture size of the flow regulating holes in different regulating hole groups increase with the increase of the distance between the cooling medium inlet and the regulating hole group. The flow at the local position can be increased by increasing the aperture of the flow regulating holes at that position, so that the flow of the cooling medium at different positions of the first cooling plate tends to be uniform, thereby reducing the probability of the occurrence of "cold zones" and "hot zones" caused by local flow velocity differences. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 This is a partial exploded view of the battery pack provided in some embodiments of the present application.

[0032] Figure 2 for Figure 1 An exploded view of the first and second cooling plates of the battery pack is shown.

[0033] Figure 3 for Figure 2 A schematic diagram of the first cooling plate from another angle is shown.

[0034] Figure 4 for Figure 3 A partial enlarged view of the second cold plate of the first cold plate is shown.

[0035] Figure 5 for Figure 2 Schematic diagram of the second cooling plate shown.

[0036] Figure 6 for Figure 5 A partial enlarged view of the third cold plate of the second cold plate is shown.

[0037] Figure 7 The flow path of the cooling medium of the battery pack provided in the embodiment of the present application.

[0038] Figure 8A This is a global temperature cloud diagram of the battery pack at the highest temperature moment provided in an embodiment of the present application.

[0039] Figure 8B for Figure 8A The grayscale image of the global temperature cloud map of the battery pack at the moment of maximum temperature is shown.

[0040] Figure 9A This is a temperature cloud diagram of the bottom cross section of the battery cell at the moment of the highest temperature of the battery pack provided by an embodiment of the present application.

[0041] Figure 9B for Figure 9A The grayscale image of the temperature cloud map of the bottom cross section of the battery cell at the moment of the highest temperature of the battery pack is shown.

[0042] Description of reference numerals:

[0043] 1000, battery pack; 100, battery case; 200, battery module; Z, first direction; X, second direction;

[0044] 10. First cooling plate; 20. Second cooling plate; 30. Housing; 41. First pipeline; 42. Second pipeline; 50. Cover plate; 60. Frame;

[0045] 11. First cold plate; 12. Second cold plate; 13. First flow channel plate; 14. Cooling medium inlet;

[0046] 131, first cooling channel; 121, flow regulating hole; 120, regulating hole group; 1201, regulating hole array;

[0047] 21. Third cold plate; 211. Guide hole; 22. Second flow channel plate; 221. Second cooling flow channel; 222. Battery fixing hole;

[0048] 31. Cavity; 61. Fixing groove;

[0049] 71. Battery; 711. Terminal; 72. Busbar; 74. FPC; 75. Connector. DETAILED DESCRIPTION

[0050] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present application. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, unless otherwise specified, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; and "inside" and "outside" refer to the outline of the device.

[0051] In related technologies, the internal structure of the battery pack is complex, and improper design of the coolant flow path can easily lead to local flow velocity differences, forming "cold zones" and "hot zones".

[0052] To improve the above problems, first, please refer to Figures 1 to 6 The embodiment of the present application provides a battery case 100, which includes a first cooling plate 10, a shell 30, and a second cooling plate 20. The first cooling plate 10 has a first cooling channel 131 and includes a cooling medium inlet 14 connected to the first cooling channel 131. The shell 30 has a cavity 31, which is used to accommodate the battery module 200. The second cooling plate 20 is located in the cavity 31 and has a second cooling channel 221, which is connected to the cavity 31. The first cooling plate 10 has a plurality of adjustment hole groups 120, each of which includes at least one flow adjustment hole 121. The first cooling channel 131 is connected to the cavity 31 through the flow adjustment hole 121. The aperture size of the flow adjustment holes 121 in different adjustment hole groups 120 increases as the distance between the adjustment hole group 120 and the cooling medium inlet 14 increases.

[0053] Among them, if the apertures of the flow regulating holes 121 are completely consistent, the flow rates of the cooling medium at different positions of the first cooling plate 10 will be large or small. The farther the distance from the cooling medium inlet 14, the slower the flow rate of the cooling medium, and the smaller the flow rate of the cooling medium. The present application sets a flow regulating hole 121 connected to the first cooling channel 131 on the first cooling plate 10, and makes the aperture size of the flow regulating holes 121 in different regulating hole groups 120 increase with the increase of the distance between the cooling medium inlet 14 and the regulating hole group 120. The flow rate at the local position can be increased by increasing the aperture of the flow regulating hole 121 at the local position, so that the flow rate of the cooling medium at different positions of the first cooling plate tends to be uniform, thereby reducing the probability of the occurrence of "cold zones" and "hot zones" due to local flow rate differences.

[0054] Please continue reading Figure 1 and Figure 7 In some embodiments of the present application, the second cooling plate 20 further includes a cooling medium outlet (not shown), which is connected to the second cooling channel 221 .

[0055] In this embodiment, the cooling medium outlet is located on a side of the second flow channel plate 22 (see below) away from the third cold plate 21 (see below).

[0056] The cooling medium outlet of the present application is connected to the second cooling channel 221. Combined with the connection between the first cooling channel 131 and the cavity 31 through the flow regulating hole 121, the cooling medium can have a flow path consisting of the cooling medium inlet 14, the first cooling channel 131, the flow regulating hole 121, the cavity 31, the second cooling channel 221, and the cooling medium outlet. Compared with the horizontal U-shaped flow in the prior art (cooling medium inlet and outlet reuse), the flow path of the cooling medium of the present application is shortened, and the temperature difference between the cooling medium inlet and outlet is reduced, thereby enhancing the controllability of the maximum temperature at the top of the battery cell.

[0057] In some embodiments of the present application, the cooling medium flows through the cavity 31 along the stacking direction (first direction Z) of the first cooling plate 10 and the second cooling plate 20. That is, the cooling medium flows vertically downward through the battery, and the flow path of the cooling medium can be further shortened, thereby further enhancing the controllability of the maximum temperature at the top of the battery cell.

[0058] See also Figure 2 and Figure 3In some embodiments of the present application, the first cooling plate 10 includes a first cold plate 11, a second cold plate 12, and a first flow channel plate 13, wherein the first flow channel plate 13 is located between the first cold plate 11 and the second cold plate 12. A first cooling channel 131 is provided on the first flow channel plate 13, the first cold plate 11 covers the first cooling channel 131, and the flow regulating hole 121 is provided on the second cold plate 12. By separately providing the first cooling channel 131 and the flow regulating hole 121 on the first flow channel plate 13 and the second cold plate 12, the provision of the flow regulating hole 121 (including the number, aperture, etc.) will not be limited to the first cooling channel 131, and the difficulty of providing the flow regulating hole 121 can be reduced.

[0059] See also Figure 3 and Figure 4 In some embodiments of the present application, the first cooling plate 10 has a plurality of adjustment hole groups 120 distributed along a first direction Z, and each adjustment hole group 120 includes at least one flow adjustment hole 121. In the first direction Z, the vertical distance from the cooling medium inlet 14 to the Pth adjustment hole group 120 is smaller than the vertical distance from the cooling medium inlet 14 to the Qth adjustment hole group 120, and P and Q satisfy: 0<P<Q, and P and Q are positive integers. Among them, the aperture of the flow adjustment hole 121 in the Pth adjustment hole group 120 is smaller than the aperture of the flow adjustment hole 121 in the Qth adjustment hole group 120. That is, the farther away from the cooling medium inlet 14, the larger the aperture of the flow adjustment hole 121 in the adjustment hole group 120.

[0060] In this embodiment, the flow velocity of the cooling medium at the flow regulating holes 121 in the same regulating hole group 120 does not change much, which can also be understood as the flow rate of the cooling medium in the same regulating hole group 120 does not change much.

[0061] In some embodiments of the present application, the flow regulating holes 121 within each regulating hole group 120 have the same aperture size. By dividing the flow regulating holes 121 into multiple regulating hole groups 120 and ensuring that the flow regulating holes 121 within each regulating hole group 120 have the same aperture size, the difficulty of creating the flow regulating holes 121 can be reduced.

[0062] In other embodiments, the flow regulating holes 121 in each regulating hole group 120 may have different apertures. The farther away from the cooling medium inlet 14 , the larger the aperture of the flow regulating holes 121 .

[0063] In some embodiments of the present application, the plurality of adjustment hole groups 120 have a plurality of adjustment hole columns 1201 spaced apart along a first direction Z, and each adjustment hole column 1201 includes a plurality of flow adjustment holes 121 spaced apart along a second direction X, where the second direction X intersects the first direction Z. The aperture D of the flow adjustment holes 121 within each adjustment hole group 120 depends on the sequence number of the nth adjustment hole column 1201 farthest from the cooling medium inlet 14 within each adjustment hole group 120, where the sequence number of the nth adjustment hole column 1201 is n, where n is a positive integer. The sequence numbers of the adjustment hole columns 1201 are sorted together based on all the adjustment hole columns 1201 within all the adjustment hole groups 120. For example, the sequence number of the adjustment hole column 1201 closest to the cooling medium inlet 14 is 1, the next closest can be 2, and so on. The sequence number of the adjustment hole column 1201 within the adjustment hole group 120 closest to the cooling medium inlet 14 can start from 1.

[0064] This application uses the serial number of the nth regulating hole column 1201 in an regulating hole group 120 to calculate the aperture D of the flow regulating hole 121 in each regulating hole group 120. Before the aperture of the flow regulating hole is adjusted (that is, the apertures of all flow regulating holes are the same), the cooling medium at the regulating hole group corresponding to the flow regulating hole 121 of the nth regulating hole column 1201 of the same regulating hole group 120 flows the slowest. The aperture design of the flow regulating hole 121 of the nth regulating hole column 1201 is performed based on the serial number of the flow regulating hole 121 of the nth regulating hole column 1201, and the calculated aperture of the flow regulating hole 121 is more reasonable.

[0065] In some embodiments of the present application, D = Round(k1*n3-k2*n2+k3*n). Here, k1, k2, and k3 are aperture adjustment coefficients, Round(·) indicates rounding to the nearest integer, and D is expressed in mm. This also means that the tolerance of D is ±0.5 mm.

[0066] In some embodiments of the present application, D = Round(0.0002*n3 - 0.0097*n2 + 0.2784*n). That is, k1 = 0.0002, k2 = 0.0097, and k3 = 0.2784. The specific values of k1, k2, and k3 are obtained through multiple simulation calculations.

[0067] In other embodiments, the specific values of k1, k2 and k3 are not limited to the specific values of k1, k2 and k3, and may also be other values according to actual needs.

[0068] Please continue reading Figure 1In some embodiments of the present application, the number of flow regulating holes 121 increases as the distance between the flow regulating holes 121 and the cooling medium inlet 14 increases. In other words, the density of the flow regulating holes 121 increases as the distance between the flow regulating holes 121 and the cooling medium inlet 14 increases. By simultaneously adjusting the number and aperture of the flow regulating holes 121, the present application can further make the flow of the cooling medium at different locations of the first cooling plate 10 more uniform, thereby further reducing the probability of the occurrence of "cold zones" and "hot zones" caused by local flow velocity differences.

[0069] Of course, in other embodiments, the technical solution of adjusting the flow rate of the cooling medium at different positions of the first cooling plate 10 by adjusting the number of flow regulating holes 121 can also be set in parallel with the technical solution of adjusting the flow rate of the cooling medium at different positions of the first cooling plate 10 by adjusting the aperture of the flow regulating holes 121. Both technical solutions can solve the technical problems of "cold zones" and "hot zones" caused by local flow velocity differences to a certain extent.

[0070] Please continue reading Figure 1 In some embodiments of the present application, the number of the first cooling plate 10, the second cooling plate 20, the shell 30 and the battery module 200 is multiple, and one first cooling plate 10 corresponds to one second cooling plate 20, one shell 30 and one battery module 200.

[0071] In some embodiments of the present application, the cooling medium inlet 14 is connected to the plurality of first cooling channels 131 through the first pipeline 41 .

[0072] In some embodiments of the present application, the cooling medium outlet is connected to the plurality of second cooling channels 221 through the second pipeline 42 .

[0073] In some embodiments of the present application, the battery case 100 further includes a frame 60 having a plurality of fixing slots 61 therein, and each housing 30 is fixed in a fixing slot 61. The frame 60 is used to fix the plurality of battery modules 200.

[0074] In some embodiments of the present application, the battery case 100 further includes a cover plate 50 , which is located on a side of the first cooling plate 10 away from the shell 30 and covers the first cooling plate 10 . The cover plate 50 is fixedly connected to the frame 60 to protect the battery module 200 .

[0075] See also Figure 2 、 Figure 5 and Figure 6In some embodiments of the present application, the second cooling plate 20 includes a third cold plate 21 and a second flow channel plate 22. The second flow channel plate 22 is located on the side of the third cold plate 21 away from the first cooling plate 10. The second cooling channel 221 is provided in the second flow channel plate 22, and the third cold plate 21 covers the second cooling channel 221. The third cold plate 21 has a guide hole 211, which connects the cavity 31 and the second cooling channel 221.

[0076] In some embodiments of the present application, the aperture distribution of the guide holes 211 of the third cold plate 21 is the same as the distribution of the flow regulating holes 121 of the second cold plate 12. This allows the coolant to flow smoothly into the second cooling channel 221 from different locations of the second cooling plate 20 and out from the cooling medium outlet.

[0077] In some embodiments of the present application, a battery fixing hole 222 is further formed on the third cold plate 21 , and one end of the battery 71 away from the pole 711 is fixed to the battery fixing hole 222 . The second cooling channel 221 is located between adjacent battery fixing holes 222 .

[0078] Please refer again Figure 1 In a second aspect, the present application further provides a battery pack 1000 , which includes the battery case 100 and the battery module 200 as described above, and the battery module 200 is housed in the cavity 31 .

[0079] The specific structure of the battery case 100 refers to the above embodiments. Since the battery case 100 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0080] In some embodiments of the present application, there are multiple battery modules 200, and the multiple battery modules 200 can be electrically connected in series or in parallel.

[0081] In some embodiments of the present application, each battery module 200 includes a plurality of batteries 71 , the plurality of batteries 71 are arranged at intervals, and the position of the flow regulating hole 121 is opposite to the gap between two adjacent batteries 71 .

[0082] In some embodiments of the present application, each battery 71 includes a pole 711 , and the first cooling plate 10 is disposed on a side of the pole 711 away from the second cooling plate 20 , and the first cooling plate 10 covers the battery 71 .

[0083] In some embodiments of the present application, different battery modules 200 are connected via connecting pieces 75 .

[0084] Each battery module 200 further includes a busbar 72, an FPC 74, and the like. The batteries 71 within each battery module 200 are connected in series or in parallel via the busbar 72, and the FPC 74 connects to the busbar 72. The busbar 72 and FPC 74 are common components in batteries and will not be described in detail here.

[0085] See also Figure 8A 、 Figure 8B 、 Figure 9A and Figure 9B , Figure 8A and Figure 8B This is a global temperature cloud diagram of the battery pack at the highest temperature moment provided in the embodiment of the present application. Figure 9A and Figure 9B This is a temperature cloud diagram of the bottom cross section of the battery cell at the highest temperature moment of the battery pack provided by the embodiment of the present application. Figure 8A 、 Figure 8B 、 Figure 9A and Figure 9B It can be seen that when the temperature of the cooling medium inlet 14 is 20°C, the time for fast charging at room temperature to the maximum temperature is 265s, the maximum temperature at the bottom of the battery cell is 31.8°C, the maximum temperature at the bottom of the battery cell is 45.63°C, the maximum temperature difference at the bottom of the battery cell is 13.8°C, the global maximum temperature is 26.94°C, the global maximum temperature is 47.65°C, and the temperature difference is 20.71°C. The maximum temperature difference at the bottom of the battery cell of the battery pack using the horizontal liquid cooling method mentioned in the background technology is 26.5°C. It can be seen that the flow rate of the cooling medium at different positions of the first cooling plate 10 of the battery pack in this case tends to be uniform, which can reduce the probability of the occurrence of "cold zones" and "hot zones" caused by local flow rate differences to a certain extent.

[0086] In addition, the present invention also provides an electrical device, which includes a battery pack 1000. The specific structure of the battery pack 1000 is similar to that of the above embodiments. Since the present electrical device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be detailed here.

[0087] It is understood that electrical equipment includes, but is not limited to, electric toys, power tools, electric vehicles, cars, ships, spacecraft, and the like. Electric toys may include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. Spacecraft may include airplanes, rockets, space shuttles, and spacecraft. Cars may include gasoline-powered cars, gas-powered cars, and new energy vehicles.

[0088] The above is a detailed introduction to the embodiments of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of the present application. At the same time, for those skilled in the art, based on the ideas of the present application, there may be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A battery box, characterized in that: include: a first cooling plate having a first cooling channel and comprising a cooling medium inlet communicating with the first cooling channel; A housing having a cavity for accommodating a battery module; and a second cooling plate, located in the cavity and having a second cooling channel, the second cooling channel being connected to the cavity; Among them, the first cooling plate has multiple adjustment hole groups, one of the adjustment hole groups includes at least one flow adjustment hole, the first cooling channel is connected to the cavity through the flow adjustment hole, and the aperture size of the flow adjustment holes in different adjustment hole groups increases with the increase of the distance between the adjustment hole group and the cooling medium inlet.

2. The battery box according to claim 1, wherein: The second cooling plate further includes a cooling medium outlet, the cooling medium outlet being in communication with the second cooling channel; The flow path of the cooling medium entering from the cooling medium inlet is: the cooling medium inlet, the first cooling channel, the flow regulating hole, the cavity, the second cooling channel and the cooling medium outlet.

3. The battery box according to claim 2, characterized in that: The cooling medium flows through the cavity along a stacking direction of the first cooling plate and the second cooling plate.

4. The battery case according to claim 1, wherein: The first cooling plate comprises: First cold plate; a second cold plate; and a first flow channel plate, located between the first cold plate and the second cold plate; The first cooling channel is opened on the first channel plate, the first cold plate covers the first cooling channel, and the flow regulating hole is provided on the second cold plate.

5. The battery case according to claim 1, wherein: The regulating hole groups are distributed along the first direction, and each regulating hole group includes at least one flow regulating hole; In the first direction, a vertical distance d1 from the cooling medium inlet to the Pth regulating hole group is less than a vertical distance d2 from the cooling medium inlet to the Qth regulating hole group, and P and Q satisfy: 0<P<Q, and P and Q are positive integers; Among them, the aperture of the flow regulating holes in the Pth regulating hole group is smaller than the aperture of the flow regulating holes in the Qth regulating hole group.

6. The battery case according to claim 5, wherein: The flow regulating holes in each regulating hole group have the same aperture size.

7. The battery case according to claim 6, wherein: The plurality of adjustment hole groups include a plurality of adjustment hole columns spaced apart along the first direction, each of the adjustment hole columns includes a plurality of the flow adjustment holes spaced apart along a second direction, and the second direction intersects the first direction; Among them, the aperture D of the flow regulating hole in each regulating hole group depends on the serial number of the nth regulating hole column farthest from the cooling medium inlet in each regulating hole group, and the serial number of the nth regulating hole column is n, where n is a positive integer.

8. The battery case according to claim 7, wherein: D=Round(k1*n3-k2*n2+k3*n); Wherein, k1, k2, and k3 are aperture adjustment coefficients, Round(·) indicates rounding to the nearest integer, and the unit of D is mm.

9. The battery case according to claim 8, wherein: D=Round(0.0002*n3-0.0097*n2+0.2784*n).

10. The battery case according to claim 2, wherein: There are multiple first cooling plates, multiple second cooling plates, and multiple shells, and one first cooling plate corresponds to one second cooling plate and one shell; The cooling medium inlet is connected to the first cooling channels via a first pipeline; and / or the cooling medium outlet is connected to the second cooling channels via a second pipeline.

11. The battery case according to claim 10, wherein: The battery box further comprises a frame having a plurality of fixing grooves, and each of the shells is fixed in one of the fixing grooves.

12. The battery case according to any one of claims 1 to 11, characterized in that: The second cooling plate comprises: third cold plate; and a second flow channel plate, located on a side of the third cold plate away from the first cooling plate, the second cooling flow channel being opened in the second flow channel plate, and the third cold plate covering the second cooling flow channel; The third cold plate has a guide hole, and the guide hole is connected to the cavity and the second cooling channel.

13. The battery case according to claim 12, wherein: The distribution of the diameters of the guide holes of the third cold plate is the same as the distribution of the flow regulating holes of the second cold plate.

14. The battery case according to any one of claims 1 to 11, characterized in that: The number of the flow regulating holes increases as the distance between the flow regulating holes and the cooling medium inlet increases.

15. A battery pack, characterized in that: include: The battery box according to any one of claims 1 to 14; and The battery module is housed in the cavity.

16. The battery pack according to claim 15, wherein: Each of the battery modules includes a plurality of batteries, the batteries are spaced apart, and the flow regulating holes are positioned opposite to the gaps between two adjacent batteries.

17. The battery pack according to claim 16, wherein: Each of the batteries includes a pole, the first cooling plate is arranged on a side of the pole away from the second cooling plate, and the first cooling plate covers the battery.

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