Cooling plate assembly and battery pack

Abstract

The utility model provides a kind of cooling plate assembly and battery pack, the cooling plate assembly is used to cool electric core module, the electric core module has opposite top end face and bottom end face along height direction, comprising: first cooling plate assembly, for being close to the top end face of the electric core module;Second cooling plate assembly, for being close to the bottom end face of the electric core module;Wherein, the immersion liquid is set to enter the battery cavity where the electric core module is by the first cooling plate assembly, and it flows to the second cooling plate assembly along the height direction of the electric core module to make the immersion liquid immerse the electric core module.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a cooling plate assembly and a battery pack. Background Technology

[0002] In related technologies, battery packs use immersion liquid to cool the cell modules. The immersion liquid enters from the side of the casing and immerses the cell modules, which results in a longer immersion time for the immersion liquid to submerge all the cell modules, thus affecting the cooling rate of the cell modules. Utility Model Content

[0003] The embodiments of this utility model provide a cooling plate assembly and a battery pack, which can improve the technical problem that the long immersion time of the battery cell module in the immersion liquid affects the cooling efficiency of the battery cell module.

[0004] In a first aspect, embodiments of the present invention provide a cooling plate assembly for cooling a battery cell module, the battery cell module having a top surface and a bottom surface opposite each other along the height direction, comprising: a first cooling plate assembly near the top surface of the battery cell module; and a second cooling plate assembly near the bottom surface of the battery cell module; wherein the immersion liquid is configured to enter the battery cavity where the battery cell module is located through the first cooling plate assembly and flow towards the second cooling plate assembly along the height direction of the battery cell module so that the immersion liquid immerses the battery cell module.

[0005] In one embodiment, the first cooling plate assembly has an inflow cavity and an outflow cavity, the outflow cavity is connected to the battery cavity, the inflow cavity has a main channel, the main channel extends along the length or width direction of the cell module, the main channel has a plurality of inlets spaced apart along the length or width direction of the cell module, and the plurality of inlets are connected to the inflow cavity and the outflow cavity.

[0006] In one embodiment, the inflow cavity and the outflow cavity are arranged along the thickness direction of the first cooling plate assembly.

[0007] In one embodiment, the first cooling plate assembly includes a first flow channel plate, a top plate located on one side of the first flow channel plate, and a first support plate located on the other side of the first flow channel plate. The first flow channel plate and the top plate enclose the inflow cavity, and the first flow channel plate and the first support plate enclose the outflow cavity.

[0008] In one embodiment, the top plate, the first flow channel plate, and the first support plate are separately arranged.

[0009] In one embodiment, the inflow cavity is further provided with a plurality of first branch channels, which are spaced apart along the length or width direction of the cell module. Each inflow inlet is connected to a first branch channel and the main channel, and each first branch channel is provided with at least one outflow outlet to connect to the outflow cavity.

[0010] In one embodiment, the main flow channels include multiple channels, which are spaced apart along the width direction of the battery cell module. The first branch channels include multiple rows, and each row of the first branch channels includes at least two first branch channels. At least two first branch channels in the same row are connected to one of the main flow channels, and adjacent first branch channels in the same row are not connected.

[0011] In one embodiment, the first cooling plate assembly includes a first flow channel plate and a top plate connected to one side of the first flow channel plate. The top plate and the first flow channel plate define the inflow cavity. The first flow channel plate includes an upper surface disposed facing the top plate. The main flow channel includes a first groove disposed on the upper surface of the first flow channel plate. The plurality of first branch flow channels include a plurality of second grooves disposed on the upper surface of the first flow channel plate. The first grooves communicate with the plurality of second grooves through the plurality of flow inlets.

[0012] In one embodiment, the outflow cavity is provided with a plurality of second branch channels, each outflow outlet is connected to a first branch channel and a second branch channel, and each second branch channel is independently connected to the battery cavity.

[0013] In one embodiment, the first cooling plate assembly further includes a first support plate connected to the other side of the first flow channel plate, the first flow channel plate and the first support plate defining the outflow cavity, the first flow channel plate including a lower surface disposed toward the first support plate, and the second flow channel including a second groove disposed on the lower surface of the first flow channel plate.

[0014] In one embodiment, the first support plate is provided with a plurality of first through holes, and each second branch channel is independently connected to the battery cavity through at least one of the first through holes.

[0015] In one embodiment, an inlet is provided on one side of the first cooling plate assembly, and the diameter of a portion of the plurality of first through holes gradually increases in the direction away from the inlet.

[0016] In one embodiment, the second cooling plate assembly includes a second support plate with a plurality of second through holes, and the second cooling plate assembly also has an outlet through which the immersion liquid flows to the outlet.

[0017] In one embodiment, the second cooling plate assembly further includes a second flow channel plate connected to the side of the second support plate opposite to the cell module. The second flow channel plate is provided with a plurality of third flow channels, each of the third flow channels connecting to portions of a plurality of the second through holes and the outlet.

[0018] In one embodiment, the second flow channel plate is provided with a plurality of pressure relief holes for the battery cell module to release pressure. The battery cell module includes a plurality of battery cells, and each pressure relief hole corresponds to one battery cell.

[0019] In one embodiment, the plurality of pressure relief holes include multiple rows, and a second diversion channel is provided between two adjacent rows of pressure relief holes.

[0020] In one embodiment, the second support plate is provided with a plurality of protruding posts, the battery cell module includes a plurality of battery cells, each of the protruding posts extends between two adjacent battery cells, and each of the protruding posts is provided with a second through hole.

[0021] In one embodiment, an inlet is provided on one side of the first cooling plate assembly, and the diameter of a portion of the plurality of second through holes gradually increases in the direction away from the inlet.

[0022] In one embodiment, the second cooling plate assembly includes a second support plate with a plurality of second through holes. The second cooling plate assembly also has an outlet, through which the immersion liquid flows to the outlet. The ratio of the diameter of the first through hole to the diameter of the second through hole is 0.13 to 7.33.

[0023] In one embodiment, the second cooling plate assembly includes a second support plate with a plurality of second through holes. The second cooling plate assembly also has an outlet, through which the immersion liquid flows to the outlet. The center of the plurality of first through holes coincides with the center of the plurality of second through holes.

[0024] Secondly, embodiments of the present invention provide a battery pack, the battery pack comprising: a cell module; a cooling plate assembly, the cooling plate assembly being configured as described above, the cooling plate assembly being configured to cool the cell module.

[0025] The beneficial effects of the embodiments of this utility model are as follows: In an embodiment of this utility model, by setting the flow path of the immersion liquid to enter the battery cavity where the cell module is located through the first cooling plate assembly, and flow to the second cooling plate assembly along the height direction of the cell module, so that the immersion liquid immerses the cell module, the immersion liquid is set such that the flow path of the immersion liquid immersing the cell module is basically set along the height direction of the cell module, thereby shortening the flow path of the immersion liquid and improving the cooling rate of the cell module. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a perspective structural diagram of the battery pack provided in an embodiment of this utility model; Figure 2 This is a three-dimensional structural diagram of the battery pack after the first cooling plate assembly is separated from the housing, according to an embodiment of this utility model. Figure 3 This is a three-dimensional schematic diagram of the first cooling plate assembly and the second cooling plate assembly of the battery pack provided in an embodiment of the present invention after they have been separated from the housing. Figure 4 This is a cross-sectional structural diagram of the first cooling plate assembly provided in an embodiment of the present invention; Figure 5 This is an exploded structural diagram of the first cooling plate assembly provided in an embodiment of the present invention; Figure 6 This is a top view of the first flow channel plate of the first cooling plate assembly provided in an embodiment of the present invention; Figure 7 This is a bottom view of the first flow channel plate of the first cooling plate assembly provided in an embodiment of the present invention; Figure 8 This is an exploded structural diagram of the second cooling plate assembly provided in an embodiment of this utility model; Figure 9 This is a top view of the second flow channel plate of the second cooling plate assembly provided in an embodiment of the present invention; Figure 10 This is a cross-sectional structural diagram of a battery pack provided in another embodiment of this utility model; 100. Battery pack; 1. Housing; 11. Side panel; 12. Battery compartment; 2. Battery cell module; 21. Battery cell; 22. Top surface; 23. Bottom surface; 200. Cooling plate assembly; 3. First cooling plate assembly; 31. Top plate; 32. First flow channel plate; 321. Upper surface; 322. Lower surface; 33. First support plate; 331. First through hole; 30. Inlet; 34. Inflow cavity; 35. Outflow cavity; 36. Main flow channel; 361. Inflow inlet; 37. First branch flow channel; 371. Outflow outlet; 38. Second branch flow channel; 4. Second cooling plate assembly; 40. Outlet; 41. Second support plate; 411. Second through hole; 42. Second flow channel plate; 421. Third flow channel; 43. Pressure relief hole; 44. Protruding hole column. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present utility model and are not intended to limit the present utility model. In the present utility model, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0029] The battery pack uses an immersion liquid to cool the cell modules. Compared to other cooling methods, immersion cooling ensures that all cell modules are in contact with the immersion liquid, resulting in high heat exchange efficiency. In related technologies, the immersion liquid enters from the side of the casing and immerses the cell modules, which leads to a longer immersion time for all cell modules, thus affecting the cooling rate of the cell modules. Furthermore, improper design of the immersion liquid flow path can cause local flow velocity differences, forming "cold zones" and "hot zones."

[0030] Embodiments of this application provide a battery pack 100, such as Figures 1 to 3 As shown, the battery pack 100 includes a housing 1, a cell module 2, and a cooling plate assembly 200.

[0031] The housing 1 includes multiple side panels 11, which enclose a battery cavity 12 to house the battery cell module 2. The battery cell module 2 includes multiple battery cells 21, which may be cylindrical, and these cells are fixed together with potting compound. The battery cell module 2 has a top surface 22 and a bottom surface 23 that are positioned opposite each other along its height direction. Figure 1The z-direction is shown.

[0032] The housing 1 has a top opening and a bottom opening. A cooling plate assembly 200 is used to cool the battery cell module 2. The cooling plate assembly 200 includes a first cooling plate assembly 3 and a second cooling plate assembly 4. The first cooling plate assembly 3 is connected to the top opening of the housing 1 and is positioned towards the top surface 22 of the battery cell module 2. The second cooling plate assembly 4 is connected to the bottom opening of the housing 1 and is positioned towards the bottom surface 23 of the battery cell module 2. The first cooling plate assembly 3 has an inlet 30 (e.g., ...). Figure 6 As shown), inlet 30 supplies immersion liquid, which is configured to enter the battery cavity 12 through the first cooling plate assembly 3 and flow along the height direction of the cell module 2 to the second cooling plate assembly 4 to immerse the cell module 2. Figure 1 The dashed arrows shown indicate the direction of the immersion liquid flow.

[0033] Understandably, if the immersion liquid inlet 30 is located on the side plate 11, the immersion liquid flowing from the left side plate needs to reach the right side plate to immerse the cell module 2, and the flow path of the immersion liquid is equal to the length of the housing 1. Alternatively, if the immersion liquid flowing from the front side plate needs to reach the rear side plate to immerse the cell module 2, the flow path of the immersion liquid is equal to the width of the housing 1. However, in the embodiment of this application, the immersion liquid flows from the first cooling plate assembly 3 located at the top of the housing 1 into the battery cavity 12, and flows along the height direction of the cell module 2 to the second cooling plate assembly 4 to immerse the cell module 2. The flow path of the immersion liquid is equal to the height of the housing 1. In the housing 1, the height of the housing 1 is much smaller than the length or width of the housing 1, thereby shortening the flow path of the immersion liquid and improving the cooling rate of the cell module 2.

[0034] The inlet 30 of the first cooling plate assembly 3 is located at one end of the first cooling plate assembly 3. The end of the cell module 2 near the inlet 30 is defined as the near end, and the end of the cell module 2 away from the inlet 30 is defined as the far end. If only multiple inlets 361 are provided on the first cooling plate assembly 3 so that the immersion liquid enters the battery cavity 12 through multiple inlets 361, the immersion liquid will preferentially cool the cell module at the near end through the inlet 361 near the inlet 30, resulting in a lower temperature for the cell module at the near end. Meanwhile, there is no immersion liquid flowing through the inlet 361 away from the inlet 30, resulting in no immersion liquid flowing through the cell module at the far end, and thus a higher temperature for the cell module. As a result, the maximum temperature of the cell module 2 is difficult to control, affecting the performance of the battery pack 100.

[0035] In some embodiments of this application, such as Figures 1 to 4 As shown, the first cooling plate assembly 3 is provided with an inflow cavity 34 and an outflow cavity 35. A main channel 36 is provided within the inflow cavity 34. The main channel 36 extends along the length or width direction of the cell module 2. The length direction of the cell module 2 is as follows: Figure 1As shown in the x-direction, the width direction of cell module 2 is as follows: Figure 1 y direction shown.

[0036] An inlet 30 is located at one end of the first cooling plate assembly 3. The cell module 2 near the inlet 30 is defined as the near-end cell module, and the cell module 2 far from the inlet 30 is defined as the far-end cell module. By extending the main channel 36 along the length or width of the cell module 2, the immersion liquid can be transported from the near end of the cell module 2 to the far end of the cell module 2.

[0037] Among them, such as Figure 2 , Figure 5 and Figure 6 As shown, the main channel 36 is provided with multiple inlets 361 at intervals along the length of the cell module 2 to connect the inlet cavity 34 and the outlet cavity 35.

[0038] The main channel 36 delivers the immersion liquid from the near end of the cell module 2 to the far end of the cell module 2, and by setting multiple inlets 361, the immersion liquid is delivered to the battery cavity 12 along the length or width direction of the cell module 2, so that the immersion liquid can flow evenly into the battery cavity 12, avoiding the absence of immersion liquid flow at the far end of the cell module 2, thereby effectively reducing the maximum temperature of the cell module 2 and improving the performance of the battery pack 100.

[0039] In some embodiments of this application, such as Figures 4 to 6 As shown, the inflow cavity 34 and outflow cavity 35 of the first cooling plate assembly 3 are arranged along the thickness direction of the first cooling plate assembly 3, wherein the thickness direction of the first cooling plate assembly 3 is the same as the height direction of the cell module 2, as shown. Figure 1 The z-direction is shown. By setting the inflow cavity 34 and the outflow cavity 35 along the thickness direction of the first cooling plate assembly 3, it is beneficial to shorten the flow path of the immersion liquid from the inflow cavity 34 to the outflow cavity 35.

[0040] In some embodiments, the first cooling plate assembly 3 includes a top plate 31, a first flow channel plate 32, and a first support plate 33 connected together. The top plate 31 is connected to one side of the first flow channel plate 32, and the first support plate 33 is connected to the other side of the first flow channel plate 32. The top plate 31 and the first flow channel plate 32 enclose an inflow cavity 34, and the first flow channel plate 32 and the first support plate 33 enclose an outflow cavity 35. By providing the first flow channel plate 32 between the top plate 31 and the first support plate 33, the inflow cavity 34 and the outflow cavity 35 are separated. By optimizing the flow channel structure of the first flow channel plate 32, the flow path of the immersion liquid in the inflow cavity 34 and the flow path of the outflow cavity 35 are optimized respectively.

[0041] In some embodiments, the top plate 31, the first flow channel plate 32, and the first support plate 33 are separately arranged, which facilitates the processing of flow channel paths on the first flow channel plate 32 and the first support plate 33.

[0042] In some embodiments of this application, such as Figures 4 to 6 As shown, the inflow cavity 34 of the first cooling plate assembly 3 is also provided with a plurality of first branch channels 37. The plurality of first branch channels 37 are arranged at intervals along the length or width direction of the cell module 2. Each inlet 361 connects a first branch channel 37 and a main channel 36. Each first branch channel 37 is provided with at least one outlet 371 to connect to the outlet cavity 35.

[0043] Multiple first flow channels 37 are spaced apart along the length or width of the cell module 2 to correspond to the cell modules at different positions. Each flow channel 37 is provided with at least one outlet 371 so that the immersion liquid can enter the outlet cavity 35 through different positions and immerse and cool the cell modules 2 at different positions, thereby improving the overall temperature uniformity of the cell module 2.

[0044] In some embodiments of this application, the width of the outlet 371 of each branch channel 37 is 3mm to 10mm. The width of the outlet 371 is set as the length extending along the length direction x of the housing. When the width of the outlet 371 is less than 3mm, the flow rate of the immersion liquid in each branch channel 37 into the outlet cavity 35 will be slower. When the width of the outlet 371 is greater than 10mm, the structural strength of the first flow channel plate 32 will be poor.

[0045] In some embodiments of this application, the width of the first distribution channel 37 is set to the length extending along the length direction x of the housing. The width of the plurality of first distribution channels 37 can be adjusted according to the length of the first cooling plate assembly 3 to regulate the flow rate of the immersion liquid within the plurality of first distribution channels 37. It is understood that the more first distribution channels 37 arranged along the length direction of the first cooling plate assembly 3, the shorter the width of the first distribution channels 37, which is more conducive to adjusting the temperature difference of the local cells in the cell module 2.

[0046] The depth of the first distribution channel 37 is set to the height extending along the z-direction of the housing. The heights of the multiple first distribution channels 37 are set to 2.0mm~3.0mm. When the depth of the first distribution channel 37 is less than 2.0mm, the flow rate of the immersion liquid into the first distribution channel 37 will be relatively low. When the depth of the first distribution channel 37 is greater than 3.0mm, the structural strength of the first distribution channel plate 32 will be relatively poor. By adjusting the depth of the multiple first distribution channels 37, the flow rate of the immersion liquid in the multiple first distribution channels 37 can be adjusted, thereby adjusting the temperature difference of the local cells in the cell module 2.

[0047] In some embodiments, the first cooling plate assembly 3 includes a top plate 31 and a first flow channel plate 32 connected to each other, the top plate 31 and the first flow channel plate 32 defining an inflow cavity 34, the first flow channel plate 32 including an upper surface 321 disposed toward the top plate, the main flow channel 36 including a first groove disposed on the upper surface 321 of the first flow channel plate 32, and a plurality of first branch channels 37 including a plurality of second grooves disposed on the upper surface 321 of the first flow channel plate 32, the first grooves being connected to the plurality of second grooves through a plurality of inlets 361.

[0048] In some embodiments, the main flow channel 36 includes multiple main flow channels 36, which are spaced apart along the width direction of the cell module 2. The multiple first branch flow channels 37 include multiple rows, and each row of first branch flow channels 37 includes at least two first branch flow channels 37. At least two first branch flow channels 37 located in the same row are connected to the same main flow channel 36, and adjacent first branch flow channels 37 located in the same row are not connected.

[0049] The main channel 36 is configured as a plurality of main channels 36 spaced apart along the width direction of the cell module 2. The plurality of first branch channels 37 include multiple rows, and each row of the first branch channels includes at least two first branch channels, so that the plurality of main channels 36 and the multiple rows of first branch channels 37 correspond to multiple cells in different rows of the cell module 2. Each row of first branch channels 37 includes at least two first branch channels 37 to correspond to multiple cells in the same row of the cell module. By setting two adjacent first branch channels 37 in the same row to be non-connected, the plurality of first branch channels 37 in the same row can supply immersion liquid to multiple cells 21 in different areas of the cell module 2, thereby keeping the temperature of the cells 21 in different areas of the cell module 2 uniform.

[0050] In some embodiments, the width of the main channel 36 is set to the length extending along the length direction x of the housing. The width of the main channel 36 can be adjusted according to the length of the first cooling plate assembly 3 to regulate the flow rate of the immersion liquid within the main channel 36. It is understood that a longer main channel 36 is more conducive to the flow of immersion liquid to the distant battery cell module.

[0051] The depth of the main flow channel 36 is set to the length extending along the height direction z of the housing. The depth of the main flow channel 36 is set to 2mm~3mm. When the depth of the main flow channel 36 is less than 2mm, the flow rate of the immersion liquid within the main flow channel 36 will decrease. When the depth of the main flow channel 36 is greater than 3mm, the structural strength of the first flow channel plate 32 will be insufficient. By adjusting the depth of multiple main flow channels 36, the flow distribution of the immersion liquid within the multiple main flow channels 36 can be adjusted, which is beneficial for regulating the temperature of local cells in the battery cell module.

[0052] In one specific embodiment, the main channel 36 includes a primary main channel and multiple secondary main channels. The primary main channel connects the inlet and the multiple secondary main channels. The primary main channel extends along the width direction of the cell module 2, and the multiple secondary main channels are spaced apart along the width direction of the cell module 2. Each secondary main channel extends along the length direction of the cell module 2. A set of first branch channels is provided between two secondary main channels. A set of first branch channels includes multiple first branch channels 37, or two sets of first branch channels are provided on both sides of the secondary main channel near the end. In one specific embodiment, the main channel includes a primary main channel and four secondary main channels. Each secondary main channel has six flow inlets. The first branch channels include eight sets of second branch channels, and each set of second branch channels includes three second branch channels.

[0053] In some embodiments, such as Figures 4 to 7 As shown, the first cooling plate assembly 3 also includes a first support plate 33 connected to the other side of the first flow channel plate 32. The first flow channel plate 32 and the first support plate 33 define the outflow cavity 35. The first flow channel plate 32 includes a lower surface 322 disposed toward the first support plate 33. The second flow channel 38 includes a second groove disposed on the lower surface 322 of the first flow channel plate 32. The first support plate 33 is provided with a plurality of first through holes 331. Each second flow channel 38 is independently connected to the battery cavity 12 through at least one first through hole 331.

[0054] By providing multiple first through holes 331 on the first support plate 33, the immersion liquid in the same second distribution channel 38 can enter the battery cavity 12 through the multiple first through holes 331 and cool the corresponding multiple battery cells 21. The immersion liquid in the second distribution channel 38 in different regions can enter the battery cavity 12 through the multiple first through holes 331 in different regions and cool the multiple battery cells 21 in different regions. This enables the immersion liquid to flow to multiple battery cells in different regions at the same time, achieving overall temperature uniformity of the battery cell module and avoiding the absence of immersion liquid flow in the far-end battery cell module.

[0055] In some embodiments of this application, the width of the second distribution channel 38 is set to the length extending along the length direction x of the housing. The width of the multiple second distribution channels 38 can be adjusted according to the length of the first cooling plate assembly 3 to regulate the flow rate of the immersion liquid within the multiple second distribution channels 38. It is understood that the more second distribution channels 38 arranged along the length direction of the first cooling plate assembly 3, the shorter the width of the second distribution channels 38, which is more conducive to adjusting the temperature difference of the local cells in the cell module 2.

[0056] The depth of the second distribution channel 38 is set to the height extending along the z-direction of the housing. The heights of the multiple second distribution channels 38 are set to 2.0mm~3.0mm. When the depth of the second distribution channel 38 is less than 2.0mm, the flow rate of the immersion liquid into the second distribution channel 38 will be relatively low. When the depth of the second distribution channel 38 is greater than 3.0mm, the structural strength of the first flow channel plate 32 will be relatively poor. By adjusting the depth of the multiple second distribution channels 38, the flow rate of the immersion liquid in the multiple second distribution channels 38 can be adjusted, thereby adjusting the temperature difference of the local cells in the cell module 2.

[0057] In some embodiments, the plurality of first through holes 331 comprises multiple rows, with multiple first through holes 331 arranged in each row. The multiple first through holes 331 in the same row are spaced apart along the length of the housing, and the aperture of the multiple first through holes 331 in the same row increases in the direction away from the inlet 30. It is understood that after the immersion liquid flows into the first cooling plate assembly 3 from the inlet 30, the immersion liquid near the inlet 30 will preferentially immerse the battery cells near the inlet. By increasing the aperture of the first through holes 331, the flow rate of the immersion liquid away from the inlet 30 increases, thereby keeping the overall cooling rate of the battery cell module the same.

[0058] In a specific embodiment, the diameter of the plurality of first through holes 331 ranges from 1.5mm to 11mm, that is, the diameter of the plurality of first through holes 331 located in the same row can be increased within the range of 1.5mm to 11mm.

[0059] In some embodiments, such as Figure 2 , Figure 3 , Figure 8 and Figure 9 As shown, the second cooling plate assembly 4 includes a second support plate 41, which has a plurality of second through holes 411. The second support plate 41 is disposed close to the bottom end face of the cell module 2 to provide support for the bottom end of the cell module 2. The second cooling plate assembly 4 has an outlet 40, through which the immersion liquid in the battery cavity 12 can flow to the outlet 40 through the plurality of second through holes 411.

[0060] By providing multiple second through holes 411 in the second support plate 41 to correspond to the battery cells 21 in different areas of the battery cell module 2, the immersion liquid can flow out through the multiple second through holes 411 in different areas of the battery cell module 2, thereby increasing the outflow rate.

[0061] In some embodiments, the plurality of second through holes 411 comprises multiple rows, with multiple second through holes 411 arranged in each row. The multiple second through holes 411 in the same row are spaced apart along the length of the housing, and the aperture of the multiple second through holes 411 in the same row increases in the direction away from the inlet 30 or closer to the outlet 40. It is understood that after the immersion liquid flows into the first cooling plate assembly 3 from the inlet 30, the immersion liquid near the inlet 30 will preferentially immerse the battery cells near the inlet. By increasing the aperture of the second through holes 411, the flow rate of the immersion liquid away from the inlet 30 is increased, thereby keeping the overall cooling rate of the battery cell module the same.

[0062] In a specific embodiment, the diameter of the plurality of second through holes 411 ranges from 1.5mm to 11mm, that is, the diameter of the plurality of second through holes 411 located in the same row can be increased within the range of 1.5mm to 11mm.

[0063] In some embodiments, the number of the plurality of first through holes 331 and the plurality of second through holes 411 are the same, and the center of the plurality of first through holes 331 coincides with the center of the plurality of second through holes 411, so that the immersion liquid maintains a uniform flow rate between the cells in the cell module along the height direction of the cell module.

[0064] The ratio of the diameter of the first through hole 331 to the diameter of the second through hole 411 is 0.13 to 7.33. When the ratio of the diameter of the first through hole 331 to the diameter of the second through hole 411 is less than 0.13, the diameter of the first through hole 331 is much smaller than the diameter of the second through hole 411, making the diameter of the first through hole 331 too small to be processed. At the same time, the diameter of the second through hole 411 is too large, making the diameter of the second through hole 411 larger than the spacing between the battery cells, which is not conducive to the support of the second support plate 41 for the battery cell module. When the ratio of the diameter of the first through hole 331 to the diameter of the second through hole 411 is greater than 7.33, the diameter of the first through hole 331 is much larger than the diameter of the second through hole 411, making the diameter of the second through hole 411 too small to be processed. At the same time, the diameter of the first through hole 331 is too large, making the diameter of the first through hole 331 larger than the spacing between the battery cells, which is not conducive to the support of the first support plate 33 for the battery cell module.

[0065] In some embodiments, the second cooling plate assembly 4 further includes a second flow channel plate 42, which is connected to the side of the second support plate 41 away from the cell module 2. The second flow channel plate 42 is provided with a plurality of third flow channels 421, each of which is connected to a portion of a plurality of second through holes 411 and an outlet 40.

[0066] In one specific embodiment, the plurality of third diversion channels 421 include multiple rows, each row of the third diversion channels 421 corresponding to a row of battery cells 21, so that the multiple rows of third diversion channels 421 correspond to battery cell modules in different regions, so that the immersion liquid can flow evenly through the multiple second through holes 411 into the multiple rows of third diversion channels 421, and flow through the third diversion channels 421 to the outlet 40 and be discharged, so that the immersion liquid corresponding to different regions of the battery cell module 2 maintains a relatively uniform flow rate.

[0067] In some embodiments, such as Figure 9 As shown, the second flow channel plate 42 is provided with multiple pressure relief holes 43, which are used to relieve pressure on the battery module 2. The battery module 2 includes multiple battery cells 21, and each pressure relief hole 43 corresponds to one battery cell 21.

[0068] When the bottom end face of the battery cell 21 is provided with a pressure relief valve, the high pressure airflow can be discharged through the multiple second through holes 411 on the second support plate 41 and the pressure relief holes 43 on the second flow channel plate 42 after the pressure relief valve of the battery cell 21 is opened.

[0069] In some embodiments, the plurality of pressure relief holes 43 include multiple rows, and a third diversion channel 421 is provided between two adjacent rows of pressure relief holes 43. The third diversion channel 421 extends in a wave shape along the length direction of the battery cell module 2.

[0070] In some other embodiments of this application, such as Figure 10 As shown, multiple battery cells of the battery cell module 2 are supported on the second cooling plate assembly 4 and fixed by potting compound. The potting compound is disposed on the second cooling plate assembly 4, and the filling height of the potting compound is less than the height of the battery cell module. In order to prevent the potting compound from clogging the multiple second through holes 411 on the second support plate 41, in another embodiment provided in this application, the second support plate 41 is provided with multiple protruding posts 44. The protruding posts 44 penetrate the potting compound and extend into the gap between the two battery cells 21. The protruding posts 44 are provided with multiple second through holes 411, and the immersion liquid flows into the third distribution channel 421 through the second through holes 411. Since the protruding posts 44 penetrate the potting compound, the potting compound is unlikely to clog the second through holes 411 on the protruding posts 44.

[0071] In some embodiments, such as Figure 8 and Figure 9As shown, a plurality of second through holes 411 are provided on the second support plate 41. The plurality of second through holes 411 include multiple rows, and each row of second through holes 411 includes multiple holes. The plurality of second through holes 411 in the same row extend along the length direction of the cell module 2. The aperture of the plurality of second through holes 411 in the same row gradually increases in the direction away from the inlet 30. It can be understood that since the immersion liquid flows in from the inlet 30 near the proximal end of the cell module 2, the temperature of the immersion liquid near the inlet 30 is lower, and the temperature of the immersion liquid away from the inlet 30 is higher. By increasing the aperture of the second through holes 411, the flow rate of the immersion liquid in the cell module 2 at the distal end is greater than the flow rate of the immersion liquid in the cell module 2 at the proximal end, thereby balancing the temperature of the cell module 2 at the proximal end and the cooling effect of the cell module 2 at the distal end, so as to improve the overall temperature uniformity of the cell module 2.

[0072] In some embodiments, the aperture of the plurality of second through holes 411 ranges from 2mm to 20mm. In a specific embodiment, the aperture of the plurality of second through holes 411 located in the same row ranges from 2mm to 20mm, thereby balancing the temperature of the cell module 2 at the near end and the cooling effect of the cell module 2 at the far end.

[0073] The embodiments of this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A cooling plate assembly for cooling a battery cell module, the battery cell module having a top end face and a bottom end face opposite each other along the height direction, characterized in that, include: A first cooling plate assembly is provided near the top surface of the battery cell module; A second cooling plate assembly is provided near the bottom end face of the battery cell module; The immersion liquid used to cool the cell module is configured to enter the battery cavity where the cell module is located through the first cooling plate assembly, and flow to the second cooling plate assembly along the height direction of the cell module so that the immersion liquid immerses the cell module.

2. The cooling plate assembly according to claim 1, characterized in that, The first cooling plate assembly has an inflow cavity and an outflow cavity. The outflow cavity is connected to the battery cavity. The inflow cavity has a main channel that extends along the length or width of the cell module. The main channel has multiple inlets spaced along the length or width of the cell module. The multiple inlets are connected to the inflow cavity and the outflow cavity.

3. The cooling plate assembly according to claim 2, characterized in that, The inflow cavity and the outflow cavity are arranged along the thickness direction of the first cooling plate assembly.

4. The cooling plate assembly according to claim 2, characterized in that, The first cooling plate assembly includes a first flow channel plate, a top plate located on one side of the first flow channel plate, and a first support plate located on the other side of the first flow channel plate. The first flow channel plate and the top plate enclose the inflow cavity, and the first flow channel plate and the first support plate enclose the outflow cavity.

5. The cooling plate assembly according to claim 4, characterized in that, The top plate, the first flow channel plate, and the first support plate are separately configured.

6. The cooling plate assembly according to claim 2, characterized in that, The inflow cavity is further provided with a plurality of first branch channels, which are spaced apart along the length or width direction of the cell module. Each inflow inlet is connected to a first branch channel and the main channel, and each first branch channel is provided with at least one outflow outlet to connect to the outflow cavity.

7. The cooling plate assembly according to claim 6, characterized in that, The main flow channels include multiple channels, which are spaced apart along the width direction of the cell module. The first branch channels include multiple rows, and each row of the first branch channels includes at least two first branch channels. At least two first branch channels in the same row are connected to one of the main flow channels.

8. The cooling plate assembly according to claim 6, characterized in that, The first cooling plate assembly includes a first flow channel plate and a top plate connected to one side of the first flow channel plate. The top plate and the first flow channel plate define the inflow cavity. The first flow channel plate includes an upper surface disposed facing the top plate. The main flow channel includes a first groove disposed on the upper surface of the first flow channel plate. The plurality of first branch flow channels include a plurality of second grooves disposed on the upper surface of the first flow channel plate. The first grooves are connected to the plurality of second grooves through the plurality of flow inlets.

9. The cooling plate assembly according to claim 8, characterized in that, The outflow cavity is provided with multiple second branch channels. Each outflow outlet is connected to a first branch channel and a second branch channel. Each second branch channel is independently connected to the battery cavity.

10. The cooling plate assembly according to claim 9, characterized in that, The first cooling plate assembly further includes a first support plate connected to the other side of the first flow channel plate. The first flow channel plate and the first support plate define the outflow cavity. The first flow channel plate includes a lower surface disposed toward the first support plate. The second flow channel includes a second groove disposed on the lower surface of the first flow channel plate.

11. The cooling plate assembly according to claim 10, characterized in that, The first support plate is provided with a plurality of first through holes, and each second flow channel is independently connected to the battery cavity through at least one of the first through holes.

12. The cooling plate assembly according to claim 11, characterized in that, The first cooling plate assembly has an inlet on one side, and the diameter of a portion of the plurality of first through holes gradually increases in the direction away from the inlet.

13. The cooling plate assembly according to any one of claims 1 to 12, characterized in that, The second cooling plate assembly includes a second support plate with a plurality of second through holes. The second cooling plate assembly also has an outlet through which the immersion liquid flows to the outlet.

14. The cooling plate assembly according to claim 13, characterized in that, The second cooling plate assembly also includes a second flow channel plate connected to the side of the second support plate opposite to the cell module. The second flow channel plate is provided with a plurality of third flow channels, each of which is connected to a portion of a plurality of second through holes and the outlet.

15. The cooling plate assembly according to claim 14, characterized in that, The second flow channel plate is provided with multiple pressure relief holes for the battery cell module to release pressure. The battery cell module includes multiple battery cells, and each pressure relief hole corresponds to one battery cell.

16. The cooling plate assembly according to claim 15, characterized in that, The plurality of pressure relief holes are arranged in multiple rows, and a third diversion channel is provided between two adjacent rows of pressure relief holes.

17. The cooling plate assembly according to claim 13, characterized in that, The second support plate is provided with a plurality of protruding posts, the battery cell module includes a plurality of battery cells, each of the protruding posts extends between two adjacent battery cells, and each of the protruding posts is provided with a second through hole.

18. The cooling plate assembly according to claim 13, characterized in that, The diameter of a portion of the plurality of second through holes gradually increases in the direction away from the inlet of the first cooling plate assembly.

19. The cooling plate assembly according to claim 12, characterized in that, The second cooling plate assembly includes a second support plate with a plurality of second through holes. The second cooling plate assembly also has an outlet, through which the immersion liquid flows to the outlet. The ratio of the diameter of the first through hole to the diameter of the second through hole is 0.13 to 7.

33.

20. The cooling plate assembly according to claim 12, characterized in that, The second cooling plate assembly includes a second support plate with a plurality of second through holes. The second cooling plate assembly also has an outlet, through which the immersion liquid flows to the outlet. The center of the plurality of first through holes coincides with the center of the plurality of second through holes.

21. A battery pack, characterized in that, The battery pack includes: Battery cell module; A cooling plate assembly, wherein the cooling plate assembly is configured as described in any one of claims 1 to 20, the cooling plate assembly being configured to cool the battery cell module.

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