Heat dissipation structure and gluing method

Abstract

The invention discloses a heat dissipation structure and a gluing method, the heat dissipation structure comprises a heat dissipation plate and a positioning strip, the positioning strip is arranged on the heat dissipation surface of the heat dissipation plate to form a space to be filled with glue, the space to be filled with the glue is glued to form a heat conduction glue layer, and the space to be filled with the glue is filled with the heat conduction glue layer. The heat dissipation structure which is glued by using the gluing method is better in gluing effect and better in heat dissipation performance.

Description

Technical Field

[0001] This application relates to the field of adhesive coating, and more particularly to a heat dissipation structure and adhesive coating method. Background Technology

[0002] In the battery industry, thermally conductive adhesive is typically applied between the heat sink and the cell module to improve heat dissipation. This adhesive transfers heat from the cell module to the heat sink, which then transfers the heat to the outside of the battery pack. However, when applying adhesive to the heat sink, the application is often ineffective, resulting in poor heat dissipation from the cell module. Summary of the Invention

[0003] The purpose of this application is to provide a heat dissipation structure and an adhesive application method to solve the problem of not being able to control the appropriate amount of adhesive.

[0004] This application provides a heat dissipation structure, which includes a heat dissipation plate and a positioning strip. The positioning strip is disposed on the heat dissipation surface of the heat dissipation plate to form a space to be filled with adhesive. Adhesive is applied to the space to be filled with adhesive to form a thermally conductive adhesive layer, which fills the space to be filled with adhesive.

[0005] In some embodiments, the positioning strip includes two first positioning strips and two second positioning strips. The two first positioning strips are arranged at intervals along the length direction of the heat sink. The two second positioning strips are both disposed between the two first positioning strips and are arranged at intervals along the width direction of the heat sink. The two first positioning strips and the two second positioning strips form a space to be filled with adhesive.

[0006] This application also provides a method for applying adhesive to a heat dissipation structure. Adhesive is applied within the space to be filled to form multiple spaced adhesive strips. The distance between the starting point of the adhesive application and the adjacent positioning strip is P, where 0.8d ≤ P ≤ 0.9d, and d is the inner diameter of the dispensing head. The heat dissipation structure is used to dissipate heat from the battery cell module. The battery cell module supports the positioning strips and compresses the multiple adhesive strips, causing the adhesive to completely fill the space to be filled, forming a thermally conductive adhesive layer. By limiting the distance between the starting point of the adhesive application and the adjacent positioning strips, interference between the dispensing head and the positioning strips is avoided, and adhesive overflow is prevented when the end face of the battery cell module is compressed into the adhesive strips. This improves the adhesive application effect of the heat dissipation structure, thereby enhancing the heat dissipation performance of the battery cell module.

[0007] In some embodiments, the glue dispensing head includes a glue conveying section and a glue dispensing section fixedly connected. Both the glue conveying section and the glue dispensing section are cylindrical, and the inner cavity of the glue conveying section is connected to the inner cavity of the glue dispensing section. d is the inner diameter of the glue dispensing section.

[0008] In some embodiments, the spacing between each pair of adjacent adhesive strips is the same, and the spacing between each pair of adjacent adhesive strips is W, 1.2d×(η / v)^0.3≤W≤1.5d×(η / v)^0.3, where η is the viscosity of the adhesive and v is the moving speed of the dispensing head.

[0009] In some embodiments, the positioning strip includes two first positioning strips and two second positioning strips. The two first positioning strips are spaced apart along the length of the heat sink. The two second positioning strips are disposed between the two first positioning strips and spaced apart along the width of the heat sink. The two first positioning strips and the two second positioning strips enclose a space to be filled with adhesive. The multiple adhesive strips are multiple first segments and multiple second segments. The multiple first segments are parallel to the length of the second positioning strips and are spaced apart parallel to each other along the length of the first positioning strips. The multiple second segments are parallel to the length of the first positioning strips and are located at opposite ends of the space to be filled with adhesive along the length of the second positioning strips. The multiple first segments and the multiple second segments are connected end to end alternately. The distance between each pair of adjacent first segments is W, the distance between the adhesive application start point and the adjacent first positioning strip is P, and the distance between each second segment and the adjacent first positioning strip is P.

[0010] In some embodiments, the application of adhesive by the dispensing head includes: moving the dispensing head along a first direction from the adhesive application starting point to a first point to form a first segment, the first direction being the length direction of the second positioning strip, and the distance between the first point and the adjacent first positioning strip being P; moving the dispensing head along a second direction from the first point to a second point to form a second segment, the second direction being perpendicular to the first direction, and the distance between the second point and the adjacent first positioning strip being P; moving the dispensing head along a third direction from the second point to a third point to form an adjacent first segment; the distance between the third point and the adjacent first positioning strip being P, and the third direction being opposite to the first direction; and moving the dispensing head along the second direction from the third point to a fourth point to form an adjacent second segment, the distance between the fourth point and the adjacent first positioning strip being P.

[0011] In some embodiments, the connection between each first segment and the connected second segment is a rounded transition, with the rounded corner size being 0.5d-1.5d.

[0012] In some embodiments, the glue dispensing head includes a glue feeding section and a glue dispensing section fixedly connected. The glue feeding section is a cylindrical cylinder, and the glue dispensing section is a flat cylinder. The inner cavity of the glue feeding section is connected to the inner cavity of the glue dispensing section, and d is the inner diameter of the glue feeding section.

[0013] In some embodiments, in each pair of adjacent adhesive strips, the distance between the center line of one adhesive strip along the width direction and the center line of the other adhesive strip along the width direction is X, where X = L + 2H × tan(θ), L is the width of the adhesive outlet, H is the distance between the adhesive outlet and the heat dissipation surface of the heat sink, and θ is the adhesive outlet angle.

[0014] In some embodiments, the positioning strip includes two first positioning strips and two second positioning strips. The two first positioning strips are arranged at intervals along the length direction of the heat sink. The two second positioning strips are disposed between the two first positioning strips and are arranged at intervals along the width direction of the heat sink. The two first positioning strips and the two second positioning strips form a space to be filled with adhesive. The multiple adhesive strips are two first segments and two second segments. The two first segments are parallel to the length direction of the second positioning strips and are arranged at intervals along the length direction of the first positioning strips. The second segment is located at one end of the space to be filled with adhesive along the length direction of the second positioning strip. The second segment is parallel to the length direction of the first positioning strips. One first segment, the second segment, and the other first segment are connected end to end in sequence. In each pair of adjacent first segments, the distance between the center line of one first segment along the width direction and the center line of the other first segment along the width direction is X. The distance between the adhesive application start point and the adjacent first positioning strip is P. The distance between the second segment and the adjacent first positioning strip is P.

[0015] In some embodiments, the application of adhesive by the dispensing head includes: moving the dispensing head along a first direction from the adhesive application starting point to a first point to form a first segment, the first direction being the length direction of the second positioning strip, and the distance between the first point and the adjacent first positioning strip being P; moving the dispensing head along a second direction from the first point to a second point to form a second segment, the second direction being perpendicular to the first direction; the distance between the second point and the adjacent first positioning strip being P; moving the dispensing head along a third direction from the second point to a third point to form an adjacent first segment; the distance between the third point and the adjacent first positioning strip being P; the third direction being opposite to the first direction.

[0016] In some embodiments, the connection between each first segment and the connected second segment is a rounded transition, with the rounded corner size being 0.5d-1.5d. Attached Figure Description

[0017] To more clearly illustrate the technical solution of this application, the accompanying drawings used in the embodiments will be briefly described below.

[0018] Figure 1 This is a three-dimensional structural diagram of the heat dissipation structure and the battery cell module provided in the first embodiment of this application.

[0019] Figure 2 yes Figure 1 The diagram shows a three-dimensional structure of the heat dissipation structure.

[0020] Figure 3 This is a schematic diagram of the adhesive application of the heat dissipation structure provided in the first embodiment of this application.

[0021] Figure 4 This is a cross-sectional view of the dispensing head provided in the first embodiment of this application.

[0022] Figure 5 This is a schematic diagram of the adhesive application of the heat dissipation structure provided in the second embodiment of this application.

[0023] Figure 6 This is a cross-sectional view of the dispensing head provided in the second embodiment of this application. Detailed Implementation

[0024] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0025] It should be noted that, in this document, the reference to "embodiment" or "implementation" means that a specific feature, structure, or characteristic described in connection with an embodiment or implementation may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0026] The terms "first" and "second" appearing in this application are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified. It should be noted that, unless otherwise explicitly stated and limited, the terms "installed," "connected," "linked," and "set on" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0027] Please refer to Figure 1 and Figure 2The first embodiment of this application provides a heat dissipation structure 100, which includes a heat dissipation plate 10 and a positioning strip 20. The positioning strip 20 is disposed on the heat dissipation surface 11 of the heat dissipation plate 10 to form a space 12 for filling with thermally conductive gel. Adhesive is applied to the space 12 to form a thermally conductive adhesive layer 13, which fills the space 12. The heat dissipation structure 100 is used to dissipate heat from a battery cell module 200. The heat dissipation structure 100 is fixedly connected to the battery cell module 200 by means including but not limited to welding, bonding, or threaded connection. The end face of the battery cell module 200 is in contact with the thermally conductive adhesive layer 13. The thermally conductive adhesive layer 13 can transfer the heat from the battery cell module 200 to the heat dissipation plate 10, and the heat dissipation plate 10 can then transfer the heat to the outside of the battery panel.

[0028] Please refer to Figure 3 and Figure 4 The first embodiment of this application also provides a method for applying adhesive to a heat dissipation structure 100, wherein adhesive is applied in the space to be filled 12 to form multiple adhesive strips 40 spaced apart from each other. The distance between the adhesive application starting point A and the adjacent positioning strip 20, and the distance between any two adjacent adhesive strips 40, need to meet the following conditions:

[0029] The distance between the glue application starting point A and the adjacent positioning strip 20 is P, and P needs to satisfy the following condition: 0.8d ≤ P ≤ 0.9d. Where d is the inner diameter of the glue applicator 300. In this embodiment, the nozzle of the glue applicator 300 is a round nozzle. The glue applicator 300 includes a glue supply section 310 and a glue outlet section 320 fixedly connected. Both the glue supply section 310 and the glue outlet section 320 are cylindrical; specifically, the glue supply section 310 is a cylindrical cylinder, and the glue outlet section 320 is a conical cylinder. The inner cavity of the glue supply section 310 connects to the inner cavity of the glue outlet section 320, and d is the inner diameter of the glue outlet of the glue outlet section 320.

[0030] The spacing between any two adjacent adhesive strips 40 is the same, and the spacing between any two adjacent adhesive strips 40 is W. W needs to satisfy the following condition: 1.2d×(η / v)^0.3≤W≤1.5d×(η / v)^0.3, where η is the viscosity of the adhesive and v is the moving speed of the dispensing head 300. After applying the adhesive according to the above method, the battery cell module 200 is assembled with the heat dissipation structure 100. The battery cell module 200 supports the positioning strip 20 and squeezes multiple adhesive strips 40 to fill the adhesive space 12 with adhesive, thereby forming a thermally conductive adhesive layer 13.

[0031] For example, in this embodiment, the heat dissipation structure 100 is rectangular. In other embodiments, the heat dissipation structure 100 may also be circular or other irregular shapes. The positioning strips 20 include two first positioning strips 21 and five second positioning strips 22. The two first positioning strips 21 are spaced apart along the length of the heat dissipation plate 10, and the five second positioning strips 22 are all disposed between the two first positioning strips 21. The five second positioning strips 22 are spaced apart sequentially along the width of the heat dissipation plate 10. The two first positioning strips 21 and the five second positioning strips 22 form four spaces 12 to be filled with adhesive, and all four spaces 12 are rectangular. In other embodiments, the number of second positioning strips 22 may also be two, with the two second positioning strips 22 and the two first positioning strips 21 forming one space 12 to be filled with adhesive. The two first positioning strips 21 are fixedly connected to both ends of the battery cell module 200 along the X-axis, and the end face of the battery cell module 200 is supported by the five second positioning strips 22 and contacts the thermally conductive adhesive layer 13.

[0032] The multiple adhesive strips 40 consist of multiple first segments 41 and multiple second segments 42. The multiple first segments 41 are all parallel to the length direction of the second positioning strip 22, and are arranged parallel to each other at intervals along the length direction of the first positioning strip 21. The multiple second segments 42 are all parallel to the length direction of the first positioning strip 21, and are located at opposite ends of the adhesive-filled space 12 along the length direction of the second positioning strip 22. The multiple first segments 41 and multiple second segments 42 are alternately connected end-to-end; that is, one first segment 41, one second segment 42, another first segment 41, and another second segment 42 are sequentially connected end-to-end. Understandably, the adhesive application trajectory is a serpentine or rectangular trajectory. In other embodiments, the adhesive application trajectory may also be a circular trajectory or other irregular trajectories.

[0033] The distance between the adhesive application starting point A and the adjacent first positioning strip 21 is P, and the distance between each second segment 42 and the adjacent first positioning strip 21 is P. By limiting the distance between the adhesive application starting point A and the adjacent first positioning strip 21, and by limiting the distance between the second segment 42 and the adjacent first positioning strip 21, interference between the adhesive applicator 300 and the first positioning strip 21 is avoided, and overflow of adhesive is avoided when the end face of the battery cell module 200 is squeezed by the adhesive strip 40. This improves the adhesive application effect of the heat dissipation structure 100, thereby improving the heat dissipation performance of the battery cell module 200. The distance between each pair of adjacent first segments 41 in the same adhesive-filling space 12 is W. By limiting the distance between each pair of adjacent first segments 41 in the same adhesive-filling space 12, the thermally conductive gel can fill the adhesive-filling space 12 when the battery cell module 200 squeezes multiple adhesive strips 40, preventing voids that would affect the heat dissipation effect.

[0034] Optionally, the connection between each first segment 41 and the connected second segment 42 is a rounded corner transition, with the rounded corner size being 0.5d-1.5d. The rounded corner transition design at the connection between each first segment 41 and the connected second segment 42 makes the movement of the glue applicator 300 smoother and prevents the glue applicator 300 from getting stuck at corners, resulting in excessive glue application in some areas.

[0035] In this embodiment, the operator can apply glue by setting the movement trajectory of the glue applicator 300. The glue application process of the round nozzle glue applicator 300 includes: moving the glue applicator 300 from the glue application starting point A to the first point B along a first direction to form a first segment 41. The first direction is the length direction of the second positioning strip 22, and the distance between the first point B and the adjacent first positioning strip 21 is P. Moving the glue applicator 300 from the first point B to the second point C along a second direction to form a second segment 42. The second direction is perpendicular to the first direction, and the distance between the second point C and the adjacent first positioning strip 21 is P, and the distance between the second point C and the first point B is W. Moving the glue applicator 300 from the second point C to the third point D along a third direction to form an adjacent first segment 41. The distance between the third point D and the adjacent first positioning strip 21 is P, and the distance between the third point D and the glue application starting point A is W. The third direction is opposite to the first direction. The glue applicator 300 is moved along the second direction from the third point D to the fourth point E to form an adjacent second segment 42. The distance between the fourth point E and the adjacent first positioning strip 21 is P, and the distance between the third point D and the fourth point E is W.

[0036] When the glue application trajectory reaches point E, one glue application cycle is completed. If it is necessary to increase the quantity of the first segment 41 and the second segment 42, the operator can control the glue application head 300 to continue moving from point E along the above trajectory. It should be noted that the glue application start point A and the glue application end point should avoid areas such as heat sources and electrode terminals. The glue application start point A and the glue application end point can be set at the point where the amount of glue required is the lowest to prevent the thermal conductive gel from accumulating.

[0037] The following example illustrates the verification process of the adhesive application method provided in the first embodiment:

[0038] The length S1 of the space 12 to be filled is 1928 mm, the width S2 is 155 mm, and the depth S3 is 1 mm. The target volume V when the thermally conductive gel uniformly fills one space 12 is... 目 =S1×S2×S3=1928×155×1=298065mm 3 The target weight M when the thermally conductive gel uniformly fills a space to be filled for 12 seconds. 目 =V 目 ×ρ=298065×0.0028=835g. The actual usage correction factor is greater than or equal to 1 and less than or equal to 1.2, then according to formula M...实 =M 目 By multiplying by n, we can obtain the actual usage M. 实 The weight of the adhesive after application must be greater than or equal to 835g and less than or equal to 1002g. In other words, the measured weight of the adhesive after application to each of the 12 spaces to be filled must be greater than or equal to 835g and less than or equal to 1002g.

[0039] In this embodiment, the inner diameter d of the glue outlet 320 of the glue dispensing head 300 is 7.5mm. According to the relationship between P and d: 0.8d≤P≤0.9d, the value of P ranges from 6 to 6.75mm. In this embodiment, P is 6mm. Therefore, the length of the first segment 41 is D1 = S1 - 2P = 1928 - 2 × 6 = 1916mm. The theoretical volume of each first segment 41 is V1 = d × T × D1 = 7.5 × 3.5 × 1916 = 50295mm. 3 Where T is the thickness of the adhesive sprayed by the 300mm nozzle.

[0040] In this embodiment, the viscosity η of the thermally conductive gel is equal to 150 Pa·s, and the moving speed v of the dispensing head 300 is equal to 10 mm / s. The distance between each pair of adjacent first segments 41 is W = 1.2d × (η / v)^0.3 = 1.2 × 7.5 × (150 / 10)^0.3 = 20 mm. Therefore, the length D2 of the second segment 42 is D2 = W = 20 mm, and the theoretical volume of each second segment 42 is V2 = d × T × D2 = 7.5 × 3.5 × 20 = 525 mm². 3 .

[0041] The number of segments in the first section 41 is N1 = S2 / W-1 = 155 / 20-1 = 6. The number of segments in the second section 42 is N2 = N1-1 = 6-1 = 5. Therefore, the theoretical total volume V of the thermally conductive gel in each space 12 to be filled is... 理 =N1×V1+N2×V2=6×50295+5×525=304395mm 3 In this embodiment, the density ρ of the thermally conductive gel is equal to 0.0028 mm². 3 The theoretical weight M of the thermally conductive gel in each 12-cell space to be filled. 理 =V 理 ×ρ=304395×0.0028=852g.

[0042] Table 1 below shows the theoretical and measured values ​​of adhesive application performed by the worker using the round nozzle 300 according to the adhesive application method of the first embodiment. Table 2 shows the target and measured values ​​of adhesive application performed by the worker using the round nozzle 300 according to the adhesive application method of the first embodiment.

[0043] Table 1

[0044]

[0045] Table 2

[0046]

[0047] Table 1 provides the theoretical value V of the adhesive volume for each adhesive-filled space 12. 理 The measured value V of the colloid volume in each space 12 to be filled 实 The deviation is 0.5%, and the theoretical value M of the glue weight in each 12-cell space to be filled is... 理 The measured value M of the glue weight of each glue-filling space 12 实 The deviation is 0.2%. Therefore, the coating equipment itself has high coating accuracy and small error, and the error of the coating equipment itself will not have a significant impact on the experimental results.

[0048] Table 2 shows the target value V of the adhesive volume for each adhesive-filled space 12. 目 The measured value V of the colloid volume in each space 12 to be filled 实 The deviation is 1.5%, and the target value M is the weight of the adhesive in each 12-cell space to be filled. 目 The measured value M of the glue weight of each glue-filling space 12 实 The deviation is 1.7%. Therefore, the deviation of the glue coating equipment using the glue coating method of the first embodiment of this application is less than 8%. Furthermore, after the glue coating equipment uses the glue coating method of the first embodiment of this application, the measured weight of the glue in each glue-to-fill space 12 is 849.7g. This measured value is greater than or equal to 835g and less than or equal to 1002g, which meets the glue application requirements.

[0049] By applying the adhesive using the above method, the amount of adhesive can be reasonably controlled, avoiding excessive adhesive that would waste thermal conductive gel, and also avoiding insufficient adhesive that would cause voids between the battery cell module 200 and the heat dissipation structure 100, thus affecting the heat dissipation performance of the battery cell module 200.

[0050] Please refer to Figure 5 and Figure 6 The adhesive application method provided in the second embodiment of this application is similar to the adhesive application method in the first embodiment of this application, with the main difference being that the adhesive application trajectory in the second embodiment is different from that in the first embodiment. The shape of the adhesive applicator in the second embodiment is also different from that in the first embodiment.

[0051] Specifically, in this embodiment, the glue supply section 310 of the glue applicator 300 is a cylindrical cylinder, and the glue dispensing section 320 is a flat cylinder, where d is the inner diameter of the glue supply section 310. Understandably, the nozzle of the glue applicator 300 is a flat nozzle, and the glue strip is flat. In the glue application method of this embodiment, the center distance between each pair of adjacent glue strips 40 is limited. Specifically, in each pair of adjacent glue strips 40, the distance between the center line of one glue strip 40 along its width direction and the center line of the other glue strip 40 along its width direction is X, where X = L + 2H × tan(θ), L is the width of the glue outlet of the glue dispensing section 320, H is the distance between the glue outlet of the glue dispensing section 320 and the heat dissipation surface 11 of the heat sink 10, and θ is the glue dispensing angle. The ejection angle refers to the angle at which thermally conductive gel, when extruded from a nozzle under pressure, does not spread out in a perfectly straight line due to its viscosity, fluidity, and extrusion pressure. Instead, it diffuses outwards, forming a fan-shaped angle. The value of θ ranges from 25 degrees to 65 degrees.

[0052] In this embodiment, the multiple adhesive strips 40 consist of two first segments 41 and one second segment 42. Both first segments 41 are parallel to the length direction of the second positioning strip 22, and are arranged at intervals along the length direction of the first positioning strip 21. The second segment 42 is located at one end of the adhesive-filling space 12 along the length direction of the second positioning strip 22, and is parallel to the length direction of the first positioning strip 21. One first segment 41, the second segment 42, and the other first segment 41 are connected end-to-end in sequence. Understandably, the adhesive application trajectory in this embodiment is a U-shaped trajectory.

[0053] In this embodiment, in each of the two adjacent first segments 41 located in the same glue-filling space 12, the distance between the center line of one first segment 41 along its width direction and the center line of the other adjacent first segment 41 along its width direction is X, the distance between the glue application starting point A and the adjacent first positioning strip 21 is P, and the distance between the second segment 42 and the adjacent first positioning strip 21 is P.

[0054] Optionally, the connection between each first segment 41 and the connected second segment 42 is a rounded corner transition, with the rounded corner size being 0.5d-1.5d. The rounded corner transition design at the connection between each first segment 41 and the connected second segment 42 makes the movement of the glue applicator 300 smoother and prevents the glue applicator 300 from getting stuck at corners, resulting in excessive glue application in some areas.

[0055] In this embodiment, the worker can apply glue by setting the movement trajectory of the glue applicator 300. The glue application process of the flat-nozzle glue applicator 300 includes: moving the glue applicator 300 from the glue application starting point A to the first point B along a first direction to form a first segment 41, the first direction being the length direction of the second positioning strip 22, and the distance between the first point B and the adjacent first positioning strip 21 being P; moving the glue applicator 300 from the first point B to the second point C along a second direction to form a second segment 42, the second direction being perpendicular to the first direction; the distance between the second point C and the adjacent first positioning strip 21 being P, and the distance between the second point C and the first point B being X; moving the glue applicator 300 from the second point C to the third point D along a third direction to form an adjacent first segment 41; the distance between the third point D and the adjacent first positioning strip 21 being P, and the distance between the third point D and the glue application starting point A being X; the third direction is opposite to the first direction. In other embodiments, if it is necessary to increase the number of the first segment 41 and the second segment 42 in the glue-filling space 12, a new glue-applying starting point A can be selected in the glue-filling space 12 according to the above glue-applying method, and then the glue can be applied again.

[0056] The following example illustrates the verification process of the adhesive application method provided in the second embodiment:

[0057] The length S1 of the space 12 to be filled is 1928 mm, the width S2 is 155 mm, and the depth S3 is 1 mm. The target volume V when the thermally conductive gel uniformly fills one space 12 is... 目标 =S1×S2×S3=1928×155×1=298065mm 3 The target weight M when the thermally conductive gel uniformly fills a space to be filled for 12 seconds. 目 =V 目 ×ρ=298065×0.0028=835g. The actual usage correction factor is greater than or equal to 1 and less than or equal to 1.2, then according to formula M... 实 =M 目 By multiplying by n, we can obtain the actual usage M. 实 The weight of the adhesive after application must be greater than or equal to 835g and less than or equal to 1002g. In other words, the measured weight of the adhesive after application to each of the 12 spaces to be filled must be greater than or equal to 835g and less than or equal to 1002g.

[0058] In this embodiment, the inner diameter d of the glue feeding section 310 of the glue applicator 300 is 7.5 mm. According to the relationship between P and d: 0.8d≤P≤0.9d, the value of P ranges from 6 to 6.75 mm. In this embodiment, P is 6 mm. Therefore, the length of the first segment 41 is D1 = S1 - 2P = 1928 - 2 × 6 = 1916 mm. The width L of the glue outlet of the glue dispensing section 320 is 48 mm, and the glue spraying thickness T of the glue applicator 300 is 1.7 mm. Therefore, the theoretical volume of each first segment 41 is V1 = L × T × D1 = 48 × 1.7 × 1916 = 156345 mm. 3 .

[0059] In this embodiment, the distance H between the glue outlet of the glue applicator 300 and the heat dissipation surface 11 of the heat sink 10 is 3mm, and the glue outlet angle θ is set to 60 degrees. Therefore, in each pair of adjacent first segments within the same glue-filling space, the distance X between the center line of one first segment 41 along the width direction and the center line of the adjacent first segment 41 along the width direction is X = L + 2H × tan(θ) = 48 × 2 × 3 × tan(60) = 65mm. Then, the length D2 of the second segment 42 is D2 = XL = 65 - 48 = 17mm, and the theoretical volume of each second segment 42 is V2 = L × T × D2 = 48 × 1.7 × 17 = 1387mm. 3 .

[0060] The quantity of the first segment 41 is N1 = S2 / L - 1 = 155 / 48 - 1 = 2 segments. The quantity of the second segment 42 is N2 = N1 - 1 = 2 - 1 = 1 segment. Therefore, the theoretical total volume V of the thermally conductive gel in each space 12 to be filled is... 理 =N1×V1+N2×V2=2×156345+1×1387=314077mm 3 In this embodiment, the density ρ of the thermally conductive gel is equal to 0.0028 mm². 3 The theoretical weight M of the thermally conductive gel in each 12-cell space to be filled. 理 =V 理 ×ρ=295603×0.0028=879g.

[0061] Table 3 below shows the theoretical and measured values ​​of adhesive application performed by workers using the flat-nozzle adhesive applicator 300 according to the adhesive application method of the second embodiment. Table 4 shows the target and measured values ​​of adhesive application performed by workers using the flat-nozzle adhesive applicator 300 according to the adhesive application method of the second embodiment.

[0062] Table 3

[0063]

[0064] Table 4

[0065]

[0066] Table 3 provides the theoretical value V of the adhesive volume for each adhesive-filled space 12. 理 The measured value V of the colloid volume in each space 12 to be filled 实 The deviation is 1%, and the theoretical value M of the glue weight in each glue-filling space 12 is... 理 The measured value M of the glue weight of each glue-filling space 12 实 The deviation is 1.7%. Therefore, the coating equipment itself has high coating accuracy and small error, and the error of the coating equipment itself will not have a significant impact on the experimental results.

[0067] Table 4 shows the target value V of the adhesive volume for each adhesive-filled space 12. 目 The measured value V of the colloid volume in each space 12 to be filled 实 The deviation is 6%, and the target value M is the weight of the adhesive in each 12-cell space to be filled. 目 The measured value M of the glue weight of each glue-filling space 12 实 The deviation is 7%. Therefore, the deviation of the glue coating equipment using the glue coating method of the second embodiment of this application is less than 8%. After the glue coating equipment uses the glue coating method of the second embodiment of this application to apply glue, the measured weight of the glue in each glue-to-fill space 12 is 894g. The measured value is greater than or equal to 835g and less than or equal to 1002g, which meets the glue application requirements.

[0068] By applying the adhesive using the above method, the amount of adhesive can be reasonably controlled, avoiding excessive adhesive that would waste thermal conductive gel, and also avoiding insufficient adhesive that would cause voids between the battery cell module 200 and the heat dissipation structure 100, thus affecting the heat dissipation performance of the battery cell module.

[0069] The embodiments of this application have been described in detail above. Specific examples have been used in this article to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application.

Claims

1. A heat dissipation structure, characterized in that, The heat dissipation structure includes a heat dissipation plate and a positioning strip. The positioning strip is disposed on the heat dissipation surface of the heat dissipation plate to form a space to be filled with adhesive. Adhesive is applied to the space to be filled to form a thermally conductive adhesive layer, which fills the space to be filled with adhesive.

2. The heat dissipation structure according to claim 1, characterized in that, The positioning strip includes two first positioning strips and two second positioning strips. The two first positioning strips are arranged at intervals along the length of the heat sink. The two second positioning strips are each disposed between the two first positioning strips and are arranged at intervals along the width of the heat sink. The two first positioning strips and the two second positioning strips form the space to be filled with adhesive.

3. A method for applying adhesive to the heat dissipation structure according to claim 1, characterized in that, Adhesive is applied to the space to be filled to form multiple adhesive strips spaced apart from each other. The distance between the starting point of the adhesive application and the adjacent positioning strip is P, 0.8d≤P≤0.9d, where d is the inner diameter of the adhesive applicator. The heat dissipation structure is used to dissipate heat from the battery cell module. The battery cell module supports the positioning strip and squeezes multiple adhesive strips to fill the space to be filled with adhesive, thereby forming the thermally conductive adhesive layer.

4. The adhesive application method according to claim 3, characterized in that, The glue dispensing head includes a glue feeding section and a glue dispensing section fixedly connected. Both the glue feeding section and the glue dispensing section are cylindrical. The inner cavity of the glue feeding section is connected to the inner cavity of the glue dispensing section, and d is the inner diameter of the glue dispensing section.

5. The adhesive application method according to claim 4, characterized in that, The spacing between any two adjacent adhesive strips is the same, and the spacing between any two adjacent adhesive strips is W, 1.2d×(η / v)^0.3≤W≤1.5d×(η / v)^0.3, where η is the viscosity of the adhesive and v is the moving speed of the dispensing head.

6. The adhesive application method according to claim 5, characterized in that, The positioning strip includes two first positioning strips and two second positioning strips. The two first positioning strips are arranged at intervals along the length of the heat sink. The two second positioning strips are each disposed between the two first positioning strips. The two second positioning strips are arranged at intervals along the width of the heat sink. The two first positioning strips and the two second positioning strips form the space to be filled with glue. The plurality of adhesive strips are comprised of a plurality of first segments and a plurality of second segments. The plurality of first segments are parallel to the length direction of the second positioning strip and are arranged at intervals parallel to each other along the length direction of the first positioning strip. The plurality of second segments are parallel to the length direction of the first positioning strip and are located at opposite ends of the space to be filled along the length direction of the second positioning strip. The plurality of first segments and the plurality of second segments are connected end to end alternately. The distance between each pair of adjacent first segments is W, the distance between the glue application start point and the adjacent first positioning strip is P, and the distance between each second segment and the adjacent first positioning strip is P.

7. The adhesive application method according to claim 6, characterized in that, The glue-applying process of the glue-applying head includes: The glue applicator is moved along the first direction from the glue application start point to the first point to form a first segment, wherein the first direction is the length direction of the second positioning strip, and the distance between the first point and the adjacent first positioning strip is P; The glue-applying head is moved from the first point to the second point along the second direction to form a second segment. The second direction is perpendicular to the first direction, and the distance between the second point and the adjacent first positioning strip is P. The glue-applying head is moved from the second point to the third point along a third direction to form an adjacent first segment; the distance between the third point and the adjacent first positioning strip is P, and the third direction is opposite to the first direction; The glue applicator is moved along the second direction from the third point to the fourth point to form an adjacent second segment, wherein the distance between the fourth point and the adjacent first positioning strip is P.

8. The adhesive application method according to claim 6, characterized in that, The connection between each of the first segment and the connected second segment is a rounded transition, and the size of the rounded corner is 0.5d-1.5d.

9. The adhesive application method according to claim 3, characterized in that, The glue dispensing head includes a glue feeding section and a glue dispensing section fixedly connected. The glue feeding section is a cylindrical cylinder, and the glue dispensing section is a flat cylinder. The inner cavity of the glue feeding section is connected to the inner cavity of the glue dispensing section, and d is the inner diameter of the glue feeding section.

10. The adhesive application method according to claim 9, characterized in that, In each pair of adjacent adhesive strips, the distance between the center line of one adhesive strip along its width direction and the center line of the other adhesive strip along its width direction is X, where X = L + 2H × tan(θ), L is the width of the adhesive outlet, H is the distance between the adhesive outlet and the heat dissipation surface of the heat sink, and θ is the adhesive outlet angle.

11. The adhesive application method according to claim 10, characterized in that, The positioning strip includes two first positioning strips and two second positioning strips. The two first positioning strips are arranged at intervals along the length of the heat sink. The two second positioning strips are each disposed between the two first positioning strips. The two second positioning strips are arranged at intervals along the width of the heat sink. The two first positioning strips and the two second positioning strips form the space to be filled with glue. The multiple adhesive strips are two first segments and two second segments. Both first segments are parallel to the length direction of the second positioning strip, and the two first segments are arranged at intervals along the length direction of the first positioning strip. The second segment is located at one end of the space to be filled along the length direction of the second positioning strip. The second segment is parallel to the length direction of the first positioning strip, and one first segment, the second segment, and the other first segment are connected end to end in sequence. In each pair of adjacent first segments, the distance between the center line of one first segment along the width direction and the center line of the other first segment along the width direction is X, the distance between the glue application start point and the adjacent first positioning strip is P, and the distance between the second segment and the adjacent first positioning strip is P.

12. The adhesive application method according to claim 11, characterized in that, The glue-applying process of the glue-applying head includes: The glue applicator is moved along the first direction from the glue application start point to the first point to form a first segment, wherein the first direction is the length direction of the second positioning strip, and the distance between the first point and the adjacent first positioning strip is P; The glue-applying head is moved from the first point to the second point along the second direction to form a second segment, the second direction being perpendicular to the first direction; the distance between the second point and the adjacent first positioning strip is P; The glue applicator is moved from the second point to the third point along a third direction to form an adjacent first segment; the distance between the third point and the adjacent first positioning strip is P; the third direction is opposite to the first direction.

13. The adhesive application method according to claim 11, characterized in that, The connection between each of the first segment and the connected second segment is a rounded transition, and the size of the rounded corner is 0.5d-1.5d.

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