Battery pack heat-conducting glue coating device and method

Abstract

The application provides a battery pack heat-conducting glue coating device and a coating method, which are used for coating heat-conducting glue between a battery module and a water-cooling plate. The battery pack heat-conducting glue coating device comprises a track card, and a groove penetrating through the thickness direction of the track card is formed in the track card. The groove comprises a first sub-groove and a second sub-groove. The first sub-groove and the second sub-groove are symmetrical along an a-axis and symmetrical along a b-axis. The depth of the groove is the filling thickness of the heat-conducting glue. The outer contour size of the track card is equal to the size of the effective coverage area on the battery module. The a-axis is the middle axis of the length direction of the track card, and the b-axis is the middle axis of the width direction of the track card. The battery pack heat-conducting glue coating device of the application is used for coating heat-conducting glue, which can meet the coverage requirement and reduce the use amount of the heat-conducting glue, so that the cost is reduced and the benefit is increased.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of battery manufacturing, in particular to a battery pack heat-conducting glue coating device and a coating method. BACKGROUND

[0002] New energy power battery pack will generate heat during charging and discharging process, so the host factory has a heat dissipation system in the design of battery pack product. In order to ensure that the heat of the battery module can be directly and efficiently transferred to the heat dissipation system, the general method is to coat heat-conducting glue between the battery module and the heat dissipation system, to eliminate the air insulation between the battery module and the heat dissipation system, so as to directly transfer the heat to the heat dissipation system, and to achieve the requirement of reducing the heat of the battery module.

[0003] At present, in the 608mm*240mm rectangular cavity, the heat-conducting glue is first coated in the shape of W on the water-cooled plate, and then the module is installed, and the heat-conducting glue is extended between the battery module and the water-cooled plate by pressing the battery module from top to bottom. The coverage rate of the heat-conducting glue must meet 95% or more of the lower surface of the battery module. In order to meet the requirement of 95% or more coverage rate, 245ml of heat-conducting glue is required (less than 245ml cannot reach 95% coverage rate).

[0004] Through research, it is found that the glue coating track adopted by different host factories and battery manufacturers is different, and the optimal glue coating track has not been formed. SUMMARY

[0005] The purpose of the present application is to provide a battery pack heat-conducting glue coating device and a coating method, which can meet the requirement of coverage rate and reduce the amount of heat-conducting glue used, so as to achieve the result of reducing cost and increasing efficiency.

[0006] In order to achieve the above purpose, the present application provides a battery pack heat-conducting glue coating device for coating heat-conducting glue between a battery module and a water-cooled plate, which comprises a track card, a groove penetrating through the thickness direction of the track card is formed on the track card, the groove comprises a first sub-groove and a second sub-groove, the first sub-groove and the second sub-groove are symmetrical along the a-axis and symmetrical along the b-axis, the depth of the groove is the filling thickness of the heat-conducting glue, and the outer contour size of the track card is equal to the size of the effective coverage area on the battery module.

[0007] Wherein, the a-axis is the central axis of the length direction of the track card, and the b-axis is the central axis of the width direction of the track card.

[0008] In one embodiment, the groove is an up-down type groove, the first sub-groove and the second sub-groove are symmetrical along the a-axis, and the first sub-groove and the second sub-groove are distributed on the upper and lower sides of the a-axis, and the first sub-groove and the second sub-groove are symmetrical along the b-axis.

[0009] In one embodiment, the first sub-slot in the upper and lower die slot comprises a first main branch along the length direction, the first main branch comprises a first main sub-branch and a second main sub-branch, the second end of the first main sub-branch is connected to the first end of the second main sub-branch, the first main sub-branch and the second main sub-branch are left-right symmetrical along the b-axis, the first end of the first main sub-branch is provided with a first secondary sub-branch extending along the width direction, the second end of the first main sub-branch is provided with a second secondary sub-branch extending along the width direction, and the angle between the first secondary sub-branch and the second secondary sub-branch and the first main sub-branch is less than 90 degrees.

[0010] In one embodiment, the depth of the upper and lower die slot is 7.8 mm.

[0011] In one embodiment, the slot is a left-right slot, the first sub-slot and the second sub-slot are left-right symmetrical along the b-axis and are distributed on the left and right sides of the b-axis, and the first sub-slot and the second sub-slot are both up-down symmetrical along the a-axis.

[0012] In one embodiment, the first sub-slot in the left-right slot comprises a second main branch along the width direction, the second main branch comprises a third main sub-branch and a fourth main sub-branch, the second end of the third main sub-branch is connected to the first end of the fourth main sub-branch, the third main sub-branch and the fourth main sub-branch are up-down symmetrical along the a-axis, the second end of the third main sub-branch is provided with a third secondary sub-branch extending along the length direction, the third secondary sub-branch is located between the a-axis and the third main sub-branch, the outer end of the third secondary sub-branch is provided with a fourth secondary sub-branch extending along the width direction, and the angle between the fourth secondary sub-branch and the third secondary sub-branch is less than 90 degrees.

[0013] In one embodiment, the depth of the left-right slot is 8.25 mm.

[0014] In one embodiment, the included angle between the side of the third secondary sub-branch close to the a-axis and the a-axis is 13.67 degrees.

[0015] In one embodiment, in the outer contour size of the trajectory card, the length is 540 mm, the width is 225 mm, and the cross-sectional area of the slot accounts for 22% of the cross-sectional area of the trajectory card.

[0016] In one embodiment, the amount of conductive adhesive used to fill the slot is 220 mL.

[0017] In one embodiment, the glue coating device for the battery pack heat-conducting adhesive further comprises a handle, and the handle is arranged at the bottom of the trajectory card.

[0018] The application also provides a glue coating method for a battery pack heat-conducting adhesive, which comprises:

[0019] 3D printing the glue coating device of the battery pack heat-conducting glue as described above, and applying release agent in the groove;

[0020] Placing the glue coating device of the battery pack heat-conducting glue on the water-cooled plate, coating the conductive glue in the groove in the track card, and scraping the upper surface, wherein the amount of glue used is 220 mL;

[0021] Taking out the glue coating device of the battery pack heat-conducting glue, installing the battery module above the heat-conducting glue, and pressing the battery module.

[0022] The battery pack heat-conducting glue coating device of the present application has the beneficial effects that the glue coating track in the glue coating device of the battery pack heat-conducting glue meets the coverage requirement while saving the amount of heat-conducting glue used, reducing the production cost, and reducing the weight of the single vehicle. The glue coating device of the battery pack heat-conducting glue of the present application guarantees the stability of high coverage while guaranteeing the amount of glue used of 220 mL, and is easy to operate. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 The schematic diagram of the upper and lower grooves of the glue coating device of the battery pack heat-conducting glue of an embodiment of the present application;

[0024] Figure 2 The schematic diagram of the left and right grooves of the glue coating device of the battery pack heat-conducting glue of an embodiment of the present application;

[0025] Figure 3 The shape parameter schematic diagram of the upper and lower grooves in the glue coating device of the battery pack heat-conducting glue of an embodiment of the present application;

[0026] Figure 4 The shape parameter schematic diagram of the left and right grooves in the glue coating device of the battery pack heat-conducting glue of an embodiment of the present application;

[0027] Figure 5 The shape schematic diagram of the glue coating track of the upper and lower grooves; Figure 3

[0028] The shape schematic diagram of the glue coating track of the left and right grooves; Figure 6 Figure 4 The shape schematic diagram of the glue coating track of the left and right grooves;

[0029] REFERENCE NUMERALS

[0030] 1, first main branch; 2, second main branch; 3, first auxiliary branch; 4, second auxiliary branch; 5, third main branch; 6, fourth main branch; 7, third auxiliary branch; 8, fourth auxiliary branch; 9, handle. DETAILED DESCRIPTION

[0031] ​In order to make the objectives, technical solutions, and advantages of the present application clearer, further detailed explanations will be given below with reference to the drawings and examples. It should be understood that the specific examples described herein are intended to explain the present application only and are not intended to limit the present application.

[0032] The purpose of the present application is to optimize the glue trajectory of the heat-conducting glue, reduce the glue usage of each battery module from 245 mL to 220 mL, and ensure that the glue coverage rate meets 95% or above. In terms of design method selection, the shape of the glue trajectory design has no hard restrictions, has great freedom, is only designed by experience, has unclear direction, and has high trial-and-error cost. Therefore, digital simulation and genetic algorithm are used to obtain a trajectory that meets the coverage rate and glue usage at the same time, and the optimal glue trajectory is selected through continuous iteration and optimization. The optimal glue trajectory selected by the present application is made into a glue coating device for battery packs, which ensures the stability of high coverage rate while ensuring the usage of 220 mL of glue, and is convenient to operate.

[0033] The present application provides a glue coating device for battery packs, which is used for coating heat-conducting glue on a battery module. The glue coating device for battery packs according to an embodiment of the present application comprises a trajectory card, and a groove penetrating through the thickness direction of the trajectory card is formed on the trajectory card, and the groove is used to fill the heat-conducting glue. The groove comprises a first sub-groove and a second sub-groove, and the first sub-groove and the second sub-groove are symmetrical along the a-axis and symmetrical along the b-axis. The depth of the groove is the filling thickness of the heat-conducting glue. The outer contour size of the trajectory card is equal to the size of the effective coverage area on the battery module. Wherein, the a-axis is the central axis in the length direction of the trajectory card, and the b-axis is the central axis in the width direction of the trajectory card.

[0034] In one embodiment, the groove is an up-down type groove. As shown in Figure 1 and Figure 3 , at this time, the first sub-groove and the second sub-groove are symmetrical along the a-axis, and the first sub-groove and the second sub-groove are distributed on the upper and lower sides of the a-axis. The first sub-groove and the second sub-groove are both symmetrical along the b-axis. Further, in the up-down type groove, the first sub-groove comprises a first main branch in the length direction. The first main branch comprises a first main branch 1 and a second main branch 2, the second end of the first main branch 1 is connected with the first end of the second main branch 2, and the first main branch 1 and the second main branch 2 are symmetrical. The first end of the first main branch 1 is provided with a first auxiliary branch 3 extending in the width direction, and the second end of the first main branch 1 is provided with a second auxiliary branch 4 extending in the width direction. The angle between the first auxiliary branch 3 and the second auxiliary branch 4 and the first main branch 1 is less than 90 degrees. Further, the depth of the up-down type groove is 7.8 mm. In this embodiment, the detailed parameters of the up-down type groove are as shown in Figure 3The thickness of the heat-conducting glue is 7.8 mm, the coverage calculation area is a rectangle of 540 mm x 225 mm (indicated by a dashed line), and the width, length and relative relationship with the coverage area of the glue coating track (indicated by a solid line) of the heat-conducting glue, Figure 3 The glue coating track is shown in detail in Figure 5 .

[0035] In another embodiment, the groove is a left-right type groove. As shown in Figure 2 and Figure 4 , at this time, the first sub-groove and the second sub-groove are left-right symmetrical along the b-axis, and the first sub-groove and the second sub-groove are distributed on the left and right sides of the b-axis. The first sub-groove and the second sub-groove are both vertically symmetrical along the a-axis. Further, in the left-right type groove, the first sub-groove includes a second main branch along the width direction. The second main branch includes a third main branch 5 and a fourth main branch 6, the second end of the third main branch 5 is connected to the first end of the fourth main branch 6, and the third main branch 5 and the fourth main branch 6 are vertically symmetrical. The second end of the third main branch 5 is provided with a third secondary branch 7 extending along the length direction, and the third secondary branch 7 is located between the a-axis and the third main branch 5. The outer end of the third secondary branch 7 is provided with a fourth secondary branch 8 extending along the width direction. The angle between the fourth secondary branch 8 and the third secondary branch 7 is less than 90 degrees. Further, the depth of the left-right type groove is 8.25 mm. Preferably in this embodiment, the angle between the side of the third secondary branch close to the a-axis and the a-axis is 13.67 degrees. Preferably in this embodiment, the detailed parameters of the left-right type groove are shown in Figure 4 . The thickness of the heat-conducting glue is 8.25 mm. The coverage calculation area is a rectangle of 540 mm x 225 mm (indicated by a dashed line), and the width, length and relative relationship with the coverage area of the glue coating track (indicated by a solid line) of the heat-conducting glue, Figure 4 have been detailed. The glue coating track is shown in detail in Figure 6 .

[0036] Preferably in this embodiment, the length of the outer contour size of the track card is 540 mm, and the width is 225 mm. The cross-sectional area of the groove accounts for 22% of the cross-sectional area of the track card. The amount of conductive glue used to fill the groove is 220 mL.

[0037] Further, the glue coating device for the battery pack heat-conducting glue further comprises a handle 3 arranged at the bottom of the track card. As shown in Figure 1 and Figure 2 , the bottom of the track card is provided with two opposite handles 3, which facilitates the taking of the track card.

[0038] The application also provides a glue coating method for a battery pack heat-conducting glue, comprising:

[0039] 3D printing the glue coating device of the battery pack heat-conducting glue as described above, and applying release agent in the groove to reduce the loss caused by the heat-conducting glue being taken away by the clamping plate;

[0040] Place the glue coating device of the battery pack heat-conducting glue on the water-cooled plate, coat the conductive glue along the groove in the clamping plate, and scrape the upper surface to ensure that the amount of glue used is 220 mL;

[0041] Take out the glue coating device of the battery pack heat-conducting glue, install the battery module above the heat-conducting glue, and pressurize the battery module to make the heat-conducting glue spread between the battery module and the shell.

[0042] Two groups of experiments are conducted using the upper and lower grooves, and the coverage of the conductive glue on the lower surface of the battery module is 98.5% and 98%, respectively, which meets the coverage requirement (the coverage of the heat-conducting glue must meet 95% or more of the lower surface of the battery module). Moreover, the optimized new trajectory not only solves the problem of air bubbles, but also meets the use of 220 mL of heat-conducting glue. After 12 test detections for stability, the coverage is counted in Table 1 below.

[0043] Table 1 Coverage statistics table of conductive glue coated by using upper and lower grooves

[0044]

[0045] Two groups of experiments are conducted using the left and right grooves, and the coverage of the conductive glue on the lower surface of the battery module is 99% and 98.5%, respectively, and there is no problem of air bubbles, and the coverage is a little higher than that of the upper and lower grooves. After 12 test detections for stability, the coverage is counted in Table 2 below.

[0046] Table 2 Coverage statistics table of conductive glue coated by using left and right grooves

[0047]

[0048]

[0049] Through the coverage evaluation of the glue coating trajectories of the two grooves, the coverage of the glue coating trajectories in the upper and lower grooves and the left and right grooves can meet the quality requirements, so both of the glue coating trajectories can be used in batches.

[0050] The battery pack heat-conducting glue coating device of the present application has the advantages that the glue coating trajectory in the battery pack heat-conducting glue coating device meets the coverage requirement, saves the amount of heat-conducting glue used, reduces the production cost, and reduces the weight of the single vehicle. The battery pack heat-conducting glue coating device of the present application ensures the stability of high coverage while ensuring the use of 220 mL of glue, and is easy to operate.

[0051] It should be understood that the terms "first", "second", "third", and "fourth" are used herein for descriptive purposes only and are not to be construed as indicating or implying relative importance.

[0052] The above-described embodiments are merely illustrative for the present application and are not intended to limit the present application in other forms. The present application can have other various embodiments. Those skilled in the art can make various corresponding modifications and changes to the present application without departing from the spirit and essence of the present application, and these corresponding modifications and changes should fall within the protection scope of the present application.

Claims

1. A battery pack heat-conducting glue coating device for coating heat-conducting glue between a battery module and a water-cooling plate, characterized in that, The glue coating device of the battery pack thermal conductive glue comprises a track card, a groove penetrating through the thickness direction of the track card is opened on the track card, the groove is an up-down type groove, the groove comprises a first sub-groove and a second sub-groove, the first sub-groove and the second sub-groove are symmetrical along the a-axis up and down, and the first sub-groove and the second sub-groove are distributed on the upper and lower sides of the a-axis, the first sub-groove and the second sub-groove are symmetrical along the b-axis left and right, the first sub-groove comprises a first main branch along the length direction, the first main branch comprises a first main branch and a second main branch, the second end of the first main branch is connected with the first end of the second main branch, the first main branch and the second main branch are symmetrical along the b-axis left and right, the first end of the first main branch is provided with a first auxiliary branch extending along the width direction, the second end of the first main branch is provided with a second auxiliary branch extending along the width direction, and the angle between the first auxiliary branch and the second auxiliary branch and the first main branch is less than 90 degrees; The depth of the groove is the filling thickness of the thermal conductive glue, the outer contour size of the track card is equal to the size of the effective coverage area on the battery module, and the depth of the groove is the filling thickness of the thermal conductive glue. The a-axis is the central axis of the length direction of the track card, and the b-axis is the central axis of the width direction of the track card.

2. The battery pack heat-conducting glue coating device according to claim 1, wherein, The depth of the up-down type groove is 7.8 mm.

3. A battery pack heat-conducting glue coating device for coating heat-conducting glue between a battery module and a water-cooling plate, characterized in that, The glue coating device of the battery pack thermal conductive glue comprises a track card, a groove penetrating through the thickness direction of the track card is opened on the track card, the groove is an up-down type groove, the groove comprises a first sub-groove and a second sub-groove, the first sub-groove and the second sub-groove are symmetrical along the a-axis up and down, and the first sub-groove and the second sub-groove are distributed on the upper and lower sides of the a-axis, the first sub-groove and the second sub-groove are symmetrical along the b-axis left and right, the first sub-groove comprises a first main branch along the length direction, the first main branch comprises a first main branch and a second main branch, the second end of the first main branch is connected with the first end of the second main branch, the first main branch and the second main branch are symmetrical along the b-axis left and right, the first end of the first main branch is provided with a first auxiliary branch extending along the width direction, the second end of the first main branch is provided with a second auxiliary branch extending along the width direction, and the angle between the first auxiliary branch and the second auxiliary branch and the first main branch is less than 90 degrees; The depth of the groove is the filling thickness of the thermal conductive glue, the outer contour size of the track card is equal to the size of the effective coverage area on the battery module, and the depth of the groove is the filling thickness of the thermal conductive glue. The a-axis is the central axis of the length direction of the track card, and the b-axis is the central axis of the width direction of the track card.

4. The battery pack heat-conducting glue coating device according to claim 3, wherein, The depth of the left-right type groove is 8.25 mm.

5. The battery pack heat-conducting glue coating device according to claim 4, wherein, The included angle between the side of the third auxiliary branch close to the a-axis and the a-axis is 13.67 degrees.

6. The battery pack heat-conducting glue coating device according to any one of claims 1-5, wherein, In the outer contour size of the track card, the length is 540 mm, and the width is 225 mm; the cross-sectional area of the groove accounts for 22% of the cross-sectional area of the track card.

7. The battery pack heat-conducting glue coating device according to any one of claims 1-5, wherein, The amount of conductive glue used to fill the groove is 220 mL.

8. The battery pack heat-conducting glue coating device according to any one of claims 1-5, wherein, The glue coating device of the battery pack thermal conductive glue further comprises a handle, and the handle is arranged at the bottom of the track card.

9. A method of applying a battery pack thermal adhesive, characterized by, Comprise: 3D printing the glue coating device of the battery pack thermal conductive glue as claimed in any one of claims 1-5, and applying release agent in the groove; Place the battery pack heat-conducting glue coating device on the water-cooled plate, coat the conductive glue in the groove in the track card plate, and scrape the upper surface flat, wherein the amount of glue used is 220 mL; Remove the battery pack heat-conducting glue coating device, install the battery module above the heat-conducting glue, and pressurize the battery module.

Images