Battery thermal management device and battery pack

Abstract

The utility model discloses a battery thermal management device and a battery pack, the battery thermal management device comprises a cold plate and heat-conducting glue, the cold plate comprises a liquid inlet, and the flowing direction of a medium in the cold plate is in a first direction; the heat-conducting glue is fixed on the cold plates and is used for fitting and connecting the single batteries, a plurality of heat-conducting glue are arranged on each cold plate at intervals along a first direction, and the setting area of the heat-conducting glue on the cold plate is gradually increased along the first direction. According to the application, the cold plate is arranged for the heat exchange medium to pass through and to exchange heat for the single battery, and meanwhile, based on the heat exchange sequence of the medium flowing of the single battery in the cold plate, the plurality of heat-conducting glue on the cold plate is arranged to be of a structure of which the area is gradually increased in the medium flowing direction and is close to the liquid inlet and a medium with relatively high heat exchange capacity; the heat-conducting glue with smaller area exchanges heat with the single battery, and the medium which is far away from the liquid inlet and has weaker heat exchange capacity has larger heat-conducting glue heat exchange area with the single battery, so that the heat exchange capacity change of the heat exchange medium is balanced, and the heat management uniformity of the battery is improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery thermal management device and battery pack. Background Technology

[0002] Battery thermal management devices are used in power batteries to regulate battery temperature to ensure that the battery operates within a safe and efficient temperature range. Currently, commonly used battery thermal management devices employ a cold-plate structure. This structure uses a heat exchange medium flowing through a cold plate to exchange heat with the battery, thus regulating battery temperature. It can adapt to the gaps between batteries, resulting in a compact structure and efficient heat transfer. However, as the energy density requirements of power batteries gradually increase, their size and the number of individual cells also increase. This leads to a significant difference in heat exchange between batteries near and far from the cold plate inlet, due to the temperature change of the heat exchange medium within the cold plate. Consequently, a large temperature difference occurs between the batteries on both sides of the medium flow direction within the cold plate, resulting in poor thermal management and affecting the efficient performance of the battery.

[0003] Therefore, how to improve the uniformity of thermal management of batteries in different locations within a battery pack and optimize battery performance is a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0004] In view of this, the purpose of this application is to provide a battery thermal management device and a battery pack to improve the uniformity of thermal management of batteries in various locations within the battery pack and optimize battery performance.

[0005] To achieve the above objectives, this application provides the following technical solution:

[0006] A battery thermal management device, comprising:

[0007] The cold plate includes a liquid inlet, and the medium flowing inside the cold plate flows in a first direction.

[0008] Thermally conductive adhesive is fixedly disposed on a cold plate. The thermally conductive adhesive is used to bond and connect individual cells. Multiple thermally conductive adhesives are disposed at intervals along a first direction on a single cold plate, and the area of ​​the thermally conductive adhesives on the cold plate increases along the first direction.

[0009] As can be seen from the above technical solution, one aspect of this disclosure provides a battery thermal management device, which mainly includes a cold plate and thermally conductive adhesive. The cold plate includes an inlet for the heat exchange medium to pass through and flow, and the flow direction of the cold plate is set in a single direction, which is defined here as the first direction. The thermally conductive adhesive is fixedly disposed on the cold plate and is used to connect individual cells. The thermally conductive adhesive achieves the connection between the individual cells and the cold plate by bonding, and at the same time, it can realize the heat conduction between the cold plate and the individual cells. In the first direction, multiple thermally conductive adhesives are spaced apart on the cold plate to accommodate the installation of multiple individual cells. Considering the potential for heat exchange attenuation in the heat exchange medium during the heat pipe process, the area of ​​the thermally conductive adhesives on the cold plate increases progressively along the first direction. During battery thermal management, individual cells near the liquid inlet of the cold plate connect and conduct heat to the cold plate through a smaller area of ​​thermally conductive adhesive, and exchange heat with the medium near the liquid inlet, which has a stronger heat exchange capacity. Conversely, individual cells farther from the liquid inlet of the cold plate connect and conduct heat to the cold plate through a larger area of ​​thermally conductive adhesive, and exchange heat with the medium farther from the liquid inlet, which has a weaker heat exchange capacity. By adjusting the heat exchange area between the individual cells and the cold plate, the heat exchange capacity of the medium at different locations on the cold plate is balanced, resulting in a more uniform battery thermal management effect and ensuring optimal battery performance.

[0010] In another aspect, this disclosure also provides a battery pack comprising a battery assembly consisting of multiple individual cells, wherein the battery assembly is provided with the battery thermal management device described in the above embodiments. Since the battery thermal management device has the aforementioned effects, the battery pack also possesses the aforementioned effects. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 A schematic diagram of the battery thermal management device and the assembly structure of multiple individual batteries provided in an embodiment of this utility model;

[0013] Figure 2 A front view of a single cold plate connected to two individual battery cells in an embodiment of this utility model;

[0014] Figure 3 A schematic diagram of the connection structure of thermally conductive adhesive on one side of the cold plate according to an embodiment of the present invention;

[0015] Figure 4 A schematic diagram of the connection structure of thermally conductive adhesive on a single battery according to an embodiment of the present invention;

[0016] Figure 5 An exploded view showing the positional relationship between the thermally conductive adhesive, the battery, and the electrolyte inlet.

[0017] Figure 6 A schematic diagram of the arrangement structure of multiple cold plates in the second direction provided in an embodiment of the present invention;

[0018] Figure 7 A schematic diagram of a single battery cell sandwiched between two cold plates;

[0019] Figure 8 This is a cross-sectional schematic diagram of the surrounding structure of a single battery cell.

[0020] in:

[0021] 10-Cold plate; 110-Liquid inlet; 20-Thermal conductive adhesive; 30-Single cell; 40-Foaming adhesive. Detailed Implementation

[0022] The core of this application is to disclose a battery thermal management device and battery pack, so as to improve the uniformity of thermal management of batteries in various locations in the battery pack and optimize battery performance.

[0023] To enable those skilled in the art to better understand the present application, embodiments of the present application will be described below with reference to the accompanying drawings. Furthermore, the embodiments shown below do not limit the scope of the utility model described in the claims. Additionally, the complete content of the structures represented in the following embodiments is not limited to those necessary for the solution of the utility model described in the claims.

[0024] like Figure 1 and Figure 2 As shown, one aspect of this disclosure provides a battery thermal management device, which mainly includes a cold plate 10 and thermally conductive adhesive 20. The cold plate 10 has internal flow channels for accommodating a heat exchange medium, and a liquid inlet 110 is provided on one side of the cold plate 10. The heat exchange medium enters the flow channels within the cold plate 10 through the liquid inlet 110 and flows along the flow direction of the flow channels, defined in this application as the first direction, enabling heat exchange with the individual battery cells 30 disposed around the cold plate 10.

[0025] Thermally conductive adhesive 20 is fixedly disposed on the cold plate 10 and is used to adhere the individual battery 30 to achieve connection between the individual battery 30 and the cold plate 10. Simultaneously, the thermally conductive adhesive 20 facilitates heat conduction between the individual battery 30 and the cold plate 10, enabling rapid heat exchange between the medium in the individual battery 30 and the cold plate 10. Since the cold plate 10 has a relatively long extension structure, in this embodiment, multiple thermally conductive adhesives 20 are spaced apart along the first direction on a single cold plate 10 to fix multiple individual batteries 30, while avoiding mutual interference between adjacent individual batteries 30. This ensures that the individual battery 30 exchanges heat with the cold plate 10 only through its corresponding thermally conductive adhesive 20, improving the accuracy of thermal management.

[0026] Considering that in the first direction, due to the flow of the medium and the continuous heat exchange effect, the heat exchange capacity of the medium far from the liquid inlet 110 is weaker than that of the medium near the liquid inlet 110, taking a specific working condition as an example, when the thermal management device provided in this embodiment needs to dissipate heat from the battery through the cooling medium, the cooling medium entering the cold plate 10 from the liquid inlet 110 has a lower temperature. As the cooling medium moves along the first direction, it absorbs heat from the individual battery cells 30 along the path, causing a temperature rise. This results in the cooling medium having a higher temperature far from the liquid inlet 110, correspondingly weakening its heat absorption capacity and leading to poor heat dissipation of the individual battery cells 30 far from the liquid inlet 110. The same applies when a heating medium is introduced into the cold plate 10. To balance the thermal management effect of the individual battery cells 30 at various locations, such as... Figure 2 , Figure 3 and Figure 4 As shown, the area of ​​the thermally conductive adhesive 20 on the cold plate 10 increases along the first direction. Based on the characteristics of heat transfer, a smaller area of ​​thermally conductive adhesive 20 is provided near the liquid inlet 110 of the cold plate 10. As the distance from the liquid inlet 110 increases, the area of ​​the thermally conductive adhesive 20 is increased to ensure sufficient heat conduction effect, thereby ensuring that the heat of the single cell 30 can be effectively conducted away on the entire cold plate 10, so as to achieve uniform cooling of the battery.

[0027] It should be noted that the above structure not only improves the cooling efficiency of the battery thermal management device, but also adapts to individual battery cells 30 of different sizes and shapes. It only requires adjusting the design structure of the thermally conductive adhesive 20 on the cold plate 10 to accommodate the installation of the individual battery cells 30, and maintaining the increasing area of ​​the thermally conductive adhesive 20 on the cold plate 10 along the first direction. This ensures that each battery on the cold plate 10 can be effectively cooled, avoiding performance degradation or safety hazards caused by local overheating. In addition, the above structure has high flexibility and can be adjusted and optimized according to the battery pack structure and cooling requirements in actual applications, further improving the practicality and reliability of the battery thermal management device.

[0028] In some embodiments of this disclosure, in order to further improve the uniformity of the battery thermal management process, such as... Figure 5 As shown, the bonding area between a single thermally conductive adhesive 20 and a single battery cell 30 is defined as A1, while the area of ​​the side wall where the single battery cell 30 connects to the thermally conductive adhesive 20 is mounted on the thermally conductive adhesive 20 is defined as A2. By calculating the ratio α = A1 / A2, the coverage of the thermally conductive adhesive 20 on the single battery cell 30 can be more accurately quantified and more precisely controlled, thereby optimizing the heat conduction effect. It should be noted that the ratio α is set based on the principle of heat conduction, that is, the larger the coverage of the thermally conductive adhesive 20 on the single battery cell 30, the higher the heat conduction efficiency. Based on this, for the aforementioned thermally conductive adhesive 20, the distance Lmm from the liquid inlet 110 of the cold plate 10 is given by α=L / 10000+0.0016. It should be noted that the maximum value of L varies depending on the length requirements of the battery module and the size requirements in different battery projects. Based on the design distance requirement of L and the position arrangement of the individual cells 30 within the battery module, the value of α is derived to calculate the coverage area of ​​the thermally conductive adhesive 20 on each individual cell 30 and to perform independent assembly. Based on the formula α=L / 10000+0.0016, as the distance L between the thermally conductive adhesive 20 and the liquid inlet 110 of the cold plate 10 increases, the coverage of the thermally conductive adhesive 20 on the individual cell 30 gradually increases. This results in a lower coverage area for the thermally conductive adhesive 20 closer to the liquid inlet 110, and a higher coverage area for the thermally conductive adhesive 20 farther from the liquid inlet 110. This formula allows for quantitative adjustment of the thermally conductive adhesive 20 setting based on the specific structure of the cold plate 10 and the flow characteristics of the cooling medium, thereby making the heat transfer of the entire battery thermal management device more uniform and efficient. It should be noted that in some embodiments of this disclosure, the axial spacing between adjacent individual cells 30 is designed to be 48mm-50mm, while the value of L is 37-1669, to meet the length design requirements of battery modules with a length range of 1.7m-1.8m.

[0029] It should also be noted that in the above embodiments, α represents the area ratio of the thermally conductive adhesive 20 on the outer wall of the battery. However, in the battery thermal management device provided in this disclosure, the range of α is set to 0.007≤α≤0.3 to provide a benchmark for the placement of the thermally conductive adhesive 20 on the cold plate 10 and its connection with the elevator battery. It should also be noted that in some embodiments of this disclosure, the range of α can be 0.007, 0.1, 0.15, 0.2, 0.25, or 0.3. Furthermore, it should be noted that under actual operating conditions, if the area ratio of the thermally conductive adhesive 20 on the individual battery 30 is too small, it may lead to insufficient heat conduction, failing to effectively reduce the temperature of the individual battery 30, thus affecting the performance and lifespan of the individual battery 30. Conversely, if the area ratio of the thermally conductive adhesive 20 on the individual battery 30 is too large, it will not only increase material costs but also occupy a large space, affecting the installation of the individual battery 30. Therefore, setting the range of α to 0.007≤α≤0.3 allows for the optimization of material usage and cost reduction while ensuring effective heat conduction.

[0030] The above embodiment uses the mating structure of thermally conductive adhesive 20 and single cell 30 as an example for illustration. However, in some specific embodiments disclosed, such as... Figure 6 As shown, the battery thermal management device can be equipped with multiple cold plates 10, which are spaced apart along a second direction. Individual cells 30 are disposed in the area between two cold plates 10 in the second direction. It is important to note that the second direction is the thickness direction of the cold plates 10 and is perpendicular to the first direction. This arrangement of multiple cold plates 10 allows the battery thermal management device to be divided into multiple independent control groups, enabling thermal management of multiple individual cells 30 on a single control group. Simultaneously, multiple control groups can be independently controlled, improving the device's adjustment capacity and ease of adjustment.

[0031] On this basis, such as Figure 7 As shown, thermally conductive adhesive 20 is provided on one side of each of the two adjacent cold plates 10 facing each other, and a single cell 30 is sandwiched between the two adjacent cold plates 10 in the second direction. That is, for a single cell 30, thermally conductive adhesive 20 is connected to both sides of its opposite sides in the second direction to maintain the structural stability of its placement in the battery pack and reduce the risk of shaking and accidental movement. At the same time, the single cell 30 can exchange heat with the two adjacent cold plates 10 in the second direction. By adjusting the medium state of the cold plates 10 and the covering structure of the thermally conductive adhesive 20, uniform heat conduction can be carried out from both sides of the single cell 30 simultaneously, thereby further enhancing the heat conduction effect and the thermal management uniformity of the single cell 30.

[0032] It should be noted that the structure of the multiple cooling plates 10 clamping the single cell 30 not only improves the cooling efficiency, but also makes the overall structure of the battery thermal management device more compact and space-efficient, and can better adapt to battery packs of different sizes and shapes; at the same time, the clamping structure can reduce the vibration and displacement of the single cell 30 during operation, thereby further ensuring the safety and reliability of the battery.

[0033] To further optimize the above technical solution, in some embodiments of this disclosure, for a structure where a single battery 30 simultaneously exchanges heat with two adjacent cold plates 10 in the second direction, the coverage area of ​​the thermally conductive adhesive 20 on both sides of a single battery 30 in the second direction can be arbitrarily set to adapt to different single batteries 30. To improve the ease of adjustment of the battery thermal management device and avoid uneven heat exchange in the single battery 30 caused by differential adjustment, in a specific embodiment of this disclosure, the coverage area of ​​the thermally conductive adhesive 20 on both sides of a single battery 30 in the second direction is equal, and they are arranged symmetrically on both sides of the single battery 30. This makes the heat conduction on both sides of the single battery 30 more uniform, avoiding uneven temperature of the single battery 30 caused by excessively fast heat conduction on one side and insufficient heat conduction on the other side. Specifically, the sum of the coverage areas of the thermally conductive adhesive 20 on both sides of the single battery 30 is defined as B1, and the area of ​​the outer wall surface of the single battery 30 is defined as B2. The ratio β = B1 / B2; Simultaneously, the distance between the thermally conductive adhesive 20 and the liquid inlet 110 of the cold plate 10 is H mm, and a formula relationship β=0.0003H+0.0032 is established between β and the distance H mm between the thermally conductive adhesive 20 and the liquid inlet 110 of the cold plate 10. Unlike the previous embodiment, the formula relationship β=0.0003H+0.0032 provided in this embodiment is for the relationship between the area of ​​the thermally conductive adhesive 20 and the distance between the battery and the liquid inlet 110 when thermally conductive adhesive 20 is provided on both sides of the single cell 30. The maximum distance H can also be selected according to the length design requirements of the battery assembly. For example, in a specific embodiment of this disclosure, the value of H can also be 37-1669. To meet the length design requirements of battery modules with a length range of 1.7m-1.8m, β is derived as the ratio of the coverage area of ​​the thermal conductive adhesive 20 in the two regions to the area of ​​the outer wall surface of the single cell 30. This formula can be used to determine the reasonable area distribution of the thermal conductive adhesive 20 on both sides of the single cell 30. At the same time, when the total area of ​​the thermal conductive adhesive 20 on both sides of the single cell 30 is constant, the thermal conductive adhesive 20 in the two regions can be set with the same area or different areas to meet different assembly requirements. It should be noted that it is preferable that the thermal conductive adhesive 20 areas in the two regions are the same, so that the heat conduction of the entire battery thermal management device is more uniform and efficient.

[0034] Furthermore, in some other embodiments of this disclosure, such as Figure 2 As shown, thermally conductive adhesive 20 is provided on both sides of the cold plate 10 in the thickness direction. That is, for a single cold plate 10, a single cell 30 is connected to both sides in the thickness direction. The thermal management of the single cell 30 is achieved through the structure on both sides, thereby improving the utilization rate of the cold plate 10 and enabling the single cell 30 to be installed in a more compact structure. Meanwhile, the thermally conductive adhesive 20 on either side of the cold plate 10 is spaced apart in the first direction. It should be noted that the thermally conductive adhesive 20 on both sides of the cold plate 10 is defined here as the first adhesive group and the second adhesive group. The thermally conductive adhesive 20 contained in the first adhesive group and the second adhesive group have independent spacing. As long as the area of ​​the thermally conductive adhesive 20 in the first adhesive group and the second adhesive group on the cold plate 10 increases in the first direction, the uniformity of thermal management of the single battery 30 at different positions on the cold plate 10 can be improved. At the same time, the variation range of the thermally conductive adhesive 20 in the first adhesive group and the second adhesive group in the first direction can be the same or different to meet the personalized needs of the single battery 30 on both sides of the cold plate 10. Taking a specific embodiment of this disclosure as an example, if the heat of the single battery 30 is mainly concentrated on one side of the cold plate 10, the area variation range of the thermally conductive adhesive 20 on that side can be increased to make the thermally conductive area of ​​the thermally conductive adhesive 20 change faster in the first direction, so as to adapt to the medium with faster temperature changes. If the heat distribution of a single cell 30 is relatively uniform, thermally conductive adhesive 20 with the same variation range can be used on both sides of the cold plate 10 to ensure that the heat conduction effect on both sides is consistent. With the structure of thermally conductive adhesive 20 set on both sides and with variable area variation, the battery thermal management device can more flexibly adapt to the thermal management needs of different batteries and improve the versatility and adaptability of the device.

[0035] In some embodiments of this disclosure, the battery thermal management device is used to achieve thermal management of the cylindrical battery pack. Specifically, the cold plate 10 adopts a wave-like configuration so that when the length of the cold plate 10 in the first direction is constant, it has a larger surface area, thereby enabling better contact with the thermally conductive adhesive 20 and the individual battery cells 30, and improving the efficiency of heat conduction. At the same time, the thermally conductive adhesive 20 on both sides of the cold plate 10 is disposed at the trough position of the cold plate 10 to better connect the cylindrical individual battery cells 30. The cylindrical batteries are disposed at the trough positions on both sides of the cold plate 10, which allows the projections of the cylindrical batteries on both sides of the cold plate 10 in the first direction to have a certain overlap area, thereby reducing the height space occupied by the cylindrical batteries on both sides in the second direction and increasing the stacking density of the cylindrical batteries in the battery pack. At the same time, the cylindrical batteries disposed at the trough positions on both sides of the cold plate 10 can also be limited by the wave structure of the cold plate 10 and have a uniform spacing, which allows the thermally conductive adhesive 20 to be disposed at intervals on the cold plate 10 with a uniform area variation, thereby improving the uniformity of the battery thermal management by the battery thermal management device.

[0036] Furthermore, it should be noted that the thermally conductive adhesive 20 is the path for heat exchange between the individual battery cell 30 and the cold plate 10. Its area is determined based on the heat exchange within the individual battery cell 30. In the above embodiment, for a cylindrical individual battery cell 30, the ratio between the axial coverage length of the thermally conductive adhesive 20 and the axial height of the individual battery cell 30 is 0.6-1 to ensure the coverage area of ​​the thermally conductive adhesive 20. It should also be noted that the ratio of the axial coverage length of the thermally conductive adhesive 20 to the axial height of the individual battery cell 30 can be 0.6, 0.7, 0.8, 0.9, or 1, all of which can satisfy the requirements of the thermally conductive adhesive. The coverage requirement of thermal conductive adhesive 20 is 20. It should also be noted that if the coverage length of thermal conductive adhesive 20 in the axial direction of the single cell 30 is too long, it will not only lead to material waste, but also affect the stacking flatness of the single cell 30 due to the end glue injection requirements of the single cell 30. On the other hand, if the coverage length of thermal conductive adhesive 20 in the axial direction of the single cell 30 is too short, it will affect the heat conduction effect. Therefore, the ratio between the axial coverage length of thermal conductive adhesive 20 in the single cell 30 and the axial height of the single cell 30 is set to 0.6-1 to balance the heat dissipation and assembly requirements of the single cell 30, and to provide stronger support for the safe and stable operation of the battery.

[0037] As for other areas of the single cell 30, such as Figure 8 As shown, the filling is achieved through expanding foam 40. It should be noted that expanding foam 40 is a material with excellent heat insulation and filling properties. It fills the gaps between adjacent individual cells 30, and through the combined use of expanding foam 40 and thermally conductive adhesive 20, forms a closed, surrounding structure on the outer wall of the individual cell 30, ensuring the stable placement of the individual cell 30. Simultaneously, thanks to the heat insulation properties of expanding foam 40, the individual cell 30 achieves heat conduction only through the thermally conductive adhesive 20 and the cold plate 10, reducing the impact of other factors on the heat exchange of the elevator battery. Furthermore, the increased area gradient of the thermally conductive adhesive 20 enhances the uniformity of heat conduction in the individual cell 30, ensuring effective regulation by the battery thermal management device. In addition, the application of expanding foam 40 further improves the structural strength and stability of the battery pack, effectively reducing the vibration and displacement of the individual cells 30 during operation, thereby extending battery life and improving battery safety and reliability.

[0038] Furthermore, in some other embodiments of this disclosure, a battery pack is also provided, which specifically includes a battery group composed of a plurality of individual cells 30, and the battery group is provided with one or more battery thermal management devices provided in any of the above embodiments. It should also be noted that, since the battery thermal management device has the technical effects provided in any of the above embodiments, the battery pack also has the technical effects provided in any of the above embodiments, and will not be described again here.

[0039] The terms "first," "second," "left side," and "right side," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units may not be defined in the listed steps or units, but may include steps or units not listed.

[0040] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A battery thermal management device, characterized in that, include: A cold plate (10) includes a liquid inlet (110), and the medium flowing in the cold plate (10) is in a first direction; Thermally conductive adhesive (20) is fixedly disposed on the cold plate (10). The thermally conductive adhesive (20) is used to bond and connect individual battery cells (30). Multiple thermally conductive adhesives (20) are disposed at intervals along the first direction on a single cold plate (10), and the area of ​​the thermally conductive adhesive (20) disposed on the cold plate (10) increases along the first direction.

2. The battery thermal management device as described in claim 1, characterized in that, The bonding area between the thermally conductive adhesive (20) and the single cell (30) is A1, and the side wall area of ​​the single cell (30) to be installed connected to the thermally conductive adhesive (20) is A2. The ratio of the two is α = A1 / A2. The distance between the thermally conductive adhesive (20) and the liquid inlet (110) of the cold plate (10) is L mm, then α = L / 10000 + 0.0016.

3. The battery thermal management device as described in claim 2, characterized in that, The range of α is 0.007 ≤ α ≤ 0.

3.

4. The battery thermal management device as described in claim 1, characterized in that, It includes multiple cold plates (10) spaced apart along a second direction, the second direction being perpendicular to the first direction, and thermally conductive adhesive (20) being provided on the side facing each other of two adjacent cold plates (10), and the single cell (30) being sandwiched between two adjacent cold plates (10) in the second direction.

5. The battery thermal management device as described in claim 4, characterized in that, The thermally conductive adhesive (20) covers the same area on both sides of each individual cell (30) in the second direction; The sum of the coverage areas of the thermally conductive adhesive (20) on both sides of the single cell (30) is B1, and the area of ​​the outer wall of the single cell (30) is B2. The ratio of the two is β=B1 / B2. The distance between the thermally conductive adhesive (20) and the liquid inlet (110) of the cold plate (10) is Hmm, then β=0.0003H+0.0032.

6. The battery thermal management device as described in claim 1, characterized in that, The cold plate (10) has thermally conductive adhesive (20) on both sides in its thickness direction, and the thermally conductive adhesive (20) is spaced apart in the first direction. The thermally conductive adhesives (20) respectively disposed on both sides of the cold plate (10) have an area on the cold plate (10) that increases along the first direction with the same or different variation range.

7. The battery thermal management device as described in claim 6, characterized in that, The cold plate (10) has a wave-like configuration, and the thermally conductive adhesive (20) on either side of the cold plate (10) is placed at the trough of the cold plate (10) to connect the cylindrical single cell (30).

8. The battery thermal management device as described in claim 7, characterized in that, The ratio of the axial coverage length of the thermally conductive adhesive (20) to the axial height of the single cell (30) is 0.6-1.

9. The battery thermal management device as described in claim 1, characterized in that, It also includes a foam (40) that fills adjacent individual cells (30), and the foam (40) and the thermally conductive adhesive (20) work together to form a closed surrounding structure on the outer wall of the individual cells (30).

10. A battery pack, characterized in that, The battery pack comprises multiple individual cells, and the battery pack is provided with the battery thermal management device according to any one of claims 1-9.

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