Battery thermal management device, battery module and battery box

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery heat management device, a battery module and a battery box, the battery heat management device comprises a liquid cooling plate, a heat insulation assembly and a heat conduction assembly, the liquid cooling plate is arranged on one side of a battery cell, the heat insulation assembly comprises a first heat insulation piece, and the first heat insulation piece is arranged between the battery cell and the liquid cooling plate; the battery cell, the first heat insulation piece and the liquid cooling plate are sequentially arranged in the first direction; the heat conduction assembly comprises a first heat conduction piece, a first part of the first heat conduction piece is in heat conduction connection with the battery cell in the second direction, and a second part of the first heat conduction piece is arranged between the liquid cooling plate and the first heat insulation piece in the first direction. A heat conduction path from the bottom of the liquid cooling plate to the battery cell is blocked through the first heat insulation part, and the heat conduction path is conducted from the liquid cooling plate to the first heat conduction part and then conducted to the large surface of the battery cell through the first heat conduction part, so that the battery cell is uniformly cooled, and the temperature difference is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially relates to a battery heat management device, battery module and battery box. BACKGROUND

[0002] Super fast charging greatly relieves the public's energy supplement anxiety. The power battery pack generates a lot of heat during the process of large current fast charging and discharging. In order to avoid heat accumulation, a liquid cooling plate is usually configured at the bottom of the battery pack, and the gap between the battery pack and the liquid cooling plate is filled with heat-conducting gel. When the battery pack is charging and discharging, the heat generated by the battery pack is transferred to the liquid cooling plate through the heat-conducting gel, realizing the cooling of the battery pack.

[0003] However, since the liquid cooling plate only contacts one side of the battery pack, the temperature of the side of the battery pack contacting the liquid cooling plate is lower during the heat dissipation process, and the temperature of the side not contacting the liquid cooling plate is higher, thereby generating a large temperature difference. The non-uniformity of the temperature of the battery pack will cause the non-uniformity of the current distribution, and the current density is high in the overheated area, which is easy to cause lithium precipitation phenomenon, thereby affecting the overall life and safety performance of the battery pack. SUMMARY

[0004] The utility model aims at providing a battery heat management device, battery module and battery box to solve the problem of uneven cooling and large temperature difference of the battery pack.

[0005] To achieve this purpose, the utility model adopts the following technical scheme:

[0006] In a first aspect, a battery heat management device includes: a liquid cooling plate arranged on one side of a battery cell; a heat insulation assembly including a first heat insulation member arranged between the battery cell and the liquid cooling plate, the battery cell, the first heat insulation member and the liquid cooling plate being arranged in sequence along a first direction; and a heat conduction assembly including a first heat conduction member, a first part of the first heat conduction member being in heat conduction connection with the battery cell in a second direction, and a second part of the first heat conduction member being arranged between the liquid cooling plate and the first heat insulation member in the first direction.

[0007] Preferably, the first part and the second part of the first heat conduction member are arranged on the outer wall of the battery cell.

[0008] Preferably, a plurality of battery cells are arranged along the second direction, the heat insulation assembly further includes a second heat insulation member, the battery heat management device further includes a buffer member, one of the side walls of two adjacent battery cells is connected with the second heat insulation member, and the other adjacent side wall is connected with the buffer member.

[0009] Preferably, the first thermal insulation member has a thermal conductivity ranging from 0.001 W / (m*K) to 0.024 W / (m*K); and / or, the second thermal insulation member has a thermal conductivity ranging from 0.001 W / (m*K) to 0.024 W / (m*K).

[0010] Preferably, the first thermal insulation member is attached to the first thermal conduction member; or, the first thermal insulation member is spaced apart from the first thermal conduction member.

[0011] Preferably, the thermal conduction assembly further comprises a second thermal conduction member, which is attached to the side wall of the liquid cooling plate facing the first thermal conduction member and the side wall of the first thermal conduction member facing the liquid cooling plate in the first direction.

[0012] Preferably, the first thermal conduction member has a thermal conductivity ranging from 500 W / (m*K) to 2000 W / (m*K); and / or, the second thermal conduction member has a thermal conductivity ranging from 1 W / (m*K) to 50 W / (m*K).

[0013] Preferably, the first thermal conduction member has a thickness ranging from 0.05 mm to 1 mm.

[0014] In a second aspect, a battery module comprises a plurality of the battery cells, a module housing, and the battery thermal management device as described above, wherein the battery cells are arranged in the module housing.

[0015] In a third aspect, a battery box comprises a box body and the battery module as described above, wherein the battery module is arranged in the box body; or, a box body, a plurality of the battery cells, and the battery thermal management device as described above, wherein the battery cells are arranged in the box body.

[0016] The battery thermal management device has the following beneficial effects:

[0017] By arranging the first thermal insulation member, the heat conduction path from the bottom of the liquid cooling plate to the battery cells is blocked, and the heat conduction path is guided to conduct from the liquid cooling plate to the first thermal conduction member, and then to the large surface of the battery cells through the first thermal conduction member, thereby achieving uniform cooling of the battery cells, making the temperature of the battery pack more uniform, and prolonging the overall life and safety performance of the battery pack. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a cross-sectional view of the battery thermal management device in the first embodiment of the utility model.

[0019] In the drawings:

[0020] 1, cell; 2, liquid cooling plate; 3, thermal insulation assembly; 31, first thermal insulation piece; 32, second thermal insulation piece; 4, heat conduction assembly; 41, first heat conduction piece; 42, second heat conduction piece; 5, buffer piece; X, first direction; Y, second direction. DETAILED DESCRIPTION

[0021] The utility model will be described in further detail below in combination with the drawings and examples. It can be understood that the specific examples described herein are only used to explain the utility model and are not limited to the utility model. In addition, it should be noted that only the parts related to the utility model are shown in the drawings for ease of description, not all the structures.

[0022] In the description of the utility model, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0023] In the utility model, unless otherwise explicitly specified and limited, the first feature "on" or "below" the second feature can include that the first and second features are in direct contact, or the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0024] In the description of the embodiment, the terms "up", "down", "right", etc. orientation or position relationship is based on the orientation or position relationship shown in the drawings, only for the convenience of description and simplification of operation, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" are only used to distinguish in description and have no special meaning.

[0025] Example 1

[0026] The utility model provides a kind of battery thermal management device, battery thermal management device includes liquid cooling plate 2, heat insulation component 3 and heat conduction component 4, liquid cooling plate 2 is set to the side of electric core 1;Heat insulation component 3 includes first heat insulating piece 31, first heat insulating piece 31 is set between electric core 1 and liquid cooling plate 2, electric core 1, first heat insulating piece 31, liquid cooling plate is sequentially arranged in first direction X;Heat conduction component 4 includes first heat conducting piece 41, the first part of first heat conducting piece 41 is in second direction Y and electric core heat conduction connection, the second part of first heat conducting piece 41 is set between liquid cooling plate 2 and first heat insulating piece 31 in first direction X.

[0027] Wherein, liquid cooling plate 2 is set to the bottom of electric core 1, the cross-sectional area of first heat insulating piece 31 is compatible with the bottom area of electric core 1, first heat insulating piece 31 is set to the side of first heat conducting piece 41 deviating from liquid cooling plate 2 and is set with first heat conducting piece 41 to adhere, to block the heat conduction path of liquid cooling plate 2 from bottom to electric core 1, first heat conducting piece 41 is heat conduction connection with the side wall of electric core 1.

[0028] Since first heat insulating piece 31 is set between electric core 1 and liquid cooling plate 2, the heat conduction path of liquid cooling plate 2 to electric core 1 can be blocked, and the heat conduction path is guided to conduct from liquid cooling plate 2 to first heat conducting piece 41, and then from first heat conducting piece 41 to the large surface of the side wall of electric core 1, preventing liquid cooling plate 2 from directly cooling the bottom of electric core 1, which causes uneven heating, achieving uniform cooling of electric core 1, reducing the temperature difference of electric core 1, so that the temperature of electric core 1 is more uniform, prolonging the overall life of the battery and improving safety performance.

[0029] Referring to Figure 1 In some embodiments, the first part and the second part of the first heat conducting piece 41 are wrapped around the outer wall of the electric core 1. Further, the first heat conducting piece 41 is a heat conducting film, which is wrapped around the outer wall of the electric core 1, and the thermal conductivity of the first heat conducting piece 41 ranges from 500 W / (m·K) to 2000 W / (m·K).

[0030] It should be noted that when assembling the battery thermal management device, the first heat insulating piece 31 should be attached to the bottom of the electric core 1 first, and then the first heat conducting piece 41 should be wrapped around the electric core 1 and the first heat insulating piece 31.

[0031] Under the wrapping of the first heat conducting piece 41, the heat conduction path can be guided to conduct from the bottom of the liquid cooling plate 2 to the first heat conducting piece 41, and then from the first heat conducting piece 41 to the large surface of the electric core, making the overall temperature of the electric core more uniform, avoiding the accumulation of heat on the side wall and the top of the electric core 1 caused by the direct cooling of the bottom of the electric core 1 by the liquid cooling plate 2, improving the temperature uniformity of each part of the electric core 1, and further improving the safety performance of the battery.

[0032] It can be understood that the material of the heat-conducting film can be adjusted according to actual needs. In the embodiment, the heat-conducting film is a graphene heat-conducting film, which not only has good heat-conducting performance, corrosion resistance and insulation, but also can reduce the weight and thickness of the heat-conducting film, so that the first heat-conducting member 41 can have a larger heat flux in a thinner size, realizing efficient heat transfer. Since the first heat-insulating member 31 can block the heat-conducting path of the liquid cooling plate 2 from the bottom to the battery cell 1, the first heat-conducting member 41 can be made of a material with a higher heat-conducting coefficient, which can have a better heat-conducting effect when the heat-conducting path reaches the large surface of the battery cell, thereby improving the heat-conducting efficiency and making the temperature of the battery pack more uniform, which is more conducive to the rapid heat dissipation of the large surface of the battery cell.

[0033] Referring to Figure 1 In some embodiments, the battery cell 1 is provided in a plurality along the second direction Y, the heat-insulating assembly 3 further comprises a second heat-insulating member 32, and the battery thermal management device further comprises a buffer member 5. The side wall of one of the two adjacent battery cells 1 is connected with the second heat-insulating member 32, and the adjacent side wall of the other is connected with the buffer member 5.

[0034] The second heat-insulating member 32 is arranged in abutment with the side wall of the battery cell 1 away from the first heat-conducting member 41, that is, the top and bottom of the battery cell 1 are not provided with the second heat-insulating member 32, and the longitudinal cross-sectional area of the second heat-insulating member 32 is adapted to the side area of the battery cell 1. The buffer member 5 is arranged in abutment with the first heat-conducting member 41. The buffer member 5 is made of a porous foamed adhesive material, and the longitudinal cross-sectional area of the buffer member 5 is adapted to the side wall area of the battery cell 1.

[0035] Further, in some embodiments, the first heat-insulating member 31 and the second heat-insulating member 32 are both made of aerogel material, and the heat-conducting coefficient of the first heat-insulating member 31 and the second heat-insulating member 32 ranges from 0.001 W / (m·K) to 0.024 W / (m·K).

[0036] When a plurality of battery cells 1 are arranged side by side, a buffer 5 and a heat insulation member are arranged between adjacent battery cells 1, and by arranging the second heat insulation member 32, the first heat conduction members 41 connected to adjacent battery cells 1 can be prevented from contacting each other, thereby avoiding heat accumulation and guiding the heat conduction path from the bottom of the liquid cooling plate 2 to the first heat conduction member 41, and then to the large surface of the battery cell 1 through the first heat conduction member 41, so that the heat is transferred along a fixed heat conduction path, the risk of heat diffusion is reduced, and when one battery cell 1 experiences thermal runaway, the adjacent battery cells 1 will not be affected, the temperature difference between the battery cells 1 is reduced, the overall life and safety performance of the battery are prolonged, and the buffer 5 is arranged on the side wall of the battery cell 1, which can ensure that there is a safe distance between adjacent battery cells 1 when the battery cell 1 expands, and also has certain heat insulation performance, reduces the risk of heat diffusion, avoids heat accumulation between battery cells 1, thereby making the temperature of each part of the battery cell 1 uniform, and improving the safety performance of the battery. Since the first heat insulation member 31 is arranged, not only is the uneven cooling of the battery cell avoided, but also fast and efficient large-area cooling can be achieved, the risk of local overheating of the battery cell 1 is reduced, and the second heat insulation member 32 and the buffer 5 are prevented from being affected by high temperature.

[0037] In some embodiments, each battery cell 1 can also be provided with a second heat insulation member 32 and a buffer 5, or each battery cell 1 can be provided with a second heat insulation member 32 on both sides, or each battery cell 1 can be provided with a buffer 5 on both sides. The arrangement of the second heat insulation member 32 and the buffer 5 can be flexibly adjusted according to actual needs, and will not be listed here.

[0038] It can be understood that the material of the first heat insulation member 31 and the material of the second heat insulation member 32 can also be different, and the materials of the first heat insulation member 31 and the second heat insulation member 32 can be flexibly adjusted according to actual needs. In the present embodiment, the first heat insulation member 31 and the second heat insulation member 32 are both made of aerogel material, which can make the first heat insulation member 31 and the second heat insulation member 32 have better heat insulation performance and high temperature resistance. The material of the buffer 5 can be adjusted according to actual needs, and can also be other elastic materials, which can absorb the expansion of the battery cell 1, and will not be listed here.

[0039] Referring to Figure 1 In some embodiments, the thickness of the first heat conduction member 41 ranges from 0.05mm to 1mm. For example, the thickness of the first heat conduction member 41 can be 0.05mm, 0.1mm, 0.2mm, 0.4mm, 0.6mm, 0.8mm or 1mm.

[0040] Referring to Figure 1 In some embodiments, the heat conduction assembly 4 further comprises a second heat conduction member 42, and the second heat conduction member 42 is arranged in abutment with the side wall of the first heat conduction member 41 facing the liquid cooling plate 2 and the side wall of the liquid cooling plate 2 facing the first heat conduction member 41 in the first direction X, that is, the second heat conduction member 42 is arranged between the bottom of the first heat conduction member 41 and the liquid cooling plate 2.

[0041] In the embodiment, the second heat-conducting member 42 is made of a heat-conducting structural adhesive material, and the heat-conducting coefficient of the second heat-conducting member 42 ranges from 1 W / (m·K) to 50 W / (m·K).

[0042] The second heat-conducting member 42 is attached to the liquid cooling plate 2 and the first heat-conducting member 41 on both sides, which not only guides the heat-conducting path from the liquid cooling plate 2 to the second heat-conducting member 42, from the second heat-conducting member 42 to the first heat-conducting member 41, and from the first heat-conducting member 41 to the large surface of the battery cell 1, but also fills the gap between the liquid cooling plate 2 and the first heat-conducting member 41, improves the heat-conducting efficiency, further reduces the temperature difference of each part of the battery cell 1, prolongs the service life of the battery, and improves the safety performance of the battery.

[0043] It can be understood that the material of the second heat-conducting member 42 can also be an elastic material such as a heat-conducting gel, and is not limited to a heat-conducting structural adhesive, which will not be repeated here.

[0044] The utility model also provides a battery module, including a plurality of battery cell 1, module shell (not shown in the drawing) and battery thermal management device, battery cell 1 is arranged in module shell.

[0045] Referring to Figure 1 In some embodiments, the utility model also provides a battery box, including a box body (not shown in the drawing) and a battery module, and the battery module is arranged in the box body, or including a box body, a plurality of battery cell 1 and a battery thermal management device, and the battery cell 1 is arranged in the box body.

[0046] Embodiment 2

[0047] The utility model provides a battery thermal management device, battery module and battery box, the difference lies in:

[0048] In embodiment 1, the cross-sectional area of the first heat-insulating member 31 is equal to the bottom area of the battery cell 1. In the embodiment, the cross-sectional area of the first heat-insulating member 31 is less than the bottom area of the battery cell 1, and the first heat-insulating member 31 is arranged at the middle part of the bottom surface of the battery cell 1, which not only saves space, but also makes the overall structure of the battery thermal management device more compact. The first heat-insulating member 31 can separate the bottom of the battery cell 1 from the first heat-conducting member 41, thereby blocking the direct cooling of the liquid cooling plate 2 to the bottom of the battery cell 1.

[0049] It can be understood that the cross-sectional area of the first heat-insulating member 31 can also be slightly larger than the bottom area of the battery cell 1, which can achieve the purpose of blocking the direct contact of the bottom of the battery cell 1 with the liquid cooling plate 2, and the utility model will not be repeated here. The rest of the structures of the battery thermal management device, the battery module and the battery box provided in the embodiment are the same as those in embodiment 1, and will not be repeated here.

[0050] Embodiment 3

[0051] The embodiment provides a battery thermal management device, a battery module and a battery box, and the difference lies in that:

[0052] In the embodiment 1, the first heat insulation piece 31 is attached to the bottom of the battery cell 1 and the first heat conduction piece 41. In the embodiment, the first heat insulation piece 31 is spaced apart from the first heat conduction piece 41. That is, the first heat insulation piece 31 and the first heat conduction piece 41 have a gap, which can further block the heat conduction path of the liquid cooling plate 2 and the bottom of the battery cell 1.

[0053] The remaining structure of the battery thermal management device, the battery module and the battery box provided by the embodiment are the same as those of the embodiment 1, and details are not repeated here.

[0054] Obviously, the above embodiments of the utility model are only examples for clearly illustrating the utility model, and are not the limitation of the embodiments of the utility model. For ordinary skilled in the art, various obvious changes, readjustment and replacement can be made without departing from the protection scope of the utility model. Here, it is not necessary and impossible to enumerate all the embodiments. Any modification, equivalent replacement and improvement within the spirit and principle of the utility model should be included in the protection scope of the utility model claim.

Claims

1. A battery thermal management device, characterized in that, The battery thermal management device includes: Liquid cooling plate (2), the liquid cooling plate (2) is disposed on one side of the battery cell (1); The heat insulation component (3) includes a first heat insulation element (31), which is disposed between the battery cell (1) and the liquid cooling plate (2). The battery cell (1), the first heat insulation element (31), and the liquid cooling plate (2) are arranged sequentially along a first direction. The heat-conducting component (4) includes a first heat-conducting element (41), a first part of the first heat-conducting element (41) is thermally connected to the battery cell (1) in a second direction, and a second part of the first heat-conducting element (41) is disposed between the liquid cooling plate (2) and the first heat insulation element (31) in the first direction.

2. The battery thermal management device according to claim 1, characterized in that, The first portion and the second portion of the first heat-conducting element (41) are covered and disposed on the outer wall of the battery cell (1).

3. The battery thermal management device according to claim 1, characterized in that, The battery cell (1) is provided in multiple ways along the second direction. The heat insulation component (3) also includes a second heat insulation element (32). The battery thermal management device also includes a buffer element (5). The sidewall of one of two adjacent battery cells (1) is connected to the second heat insulation element (32), and the adjacent sidewall of the other is connected to the buffer element (5).

4. The battery thermal management device according to claim 3, characterized in that, The thermal conductivity of the first thermal insulation element (31) ranges from 0.001 W / (m·K) to 0.024 W / (m·K); and / or the thermal conductivity of the second thermal insulation element (32) ranges from 0.001 W / (m·K) to 0.024 W / (m·K).

5. The battery thermal management device according to claim 1, characterized in that, The first heat insulation element (31) is attached to the first heat conduction element (41); or, the first heat insulation element (31) and the first heat conduction element (41) are spaced apart.

6. The battery thermal management device according to any one of claims 1-5, characterized in that, The heat-conducting component (4) further includes a second heat-conducting element (42), which is respectively attached to the side wall of the first heat-conducting element (41) facing the liquid cooling plate (2) and the side wall of the liquid cooling plate (2) facing the first heat-conducting element (41) in the first direction.

7. The battery thermal management device according to claim 6, characterized in that, The thermal conductivity of the first thermal conductive element (41) ranges from 500 W / (m·K) to 2000 W / (m·K); and / or the thermal conductivity of the second thermal conductive element (42) ranges from 1 W / (m·K) to 50 W / (m·K).

8. The battery thermal management device according to any one of claims 1-5, characterized in that, The thickness of the first heat-conducting element (41) ranges from 0.05 mm to 1 mm.

9. A battery module, characterized in that, It includes a plurality of battery cells (1), a module housing, and a battery thermal management device as described in any one of claims 1-8, wherein the battery cells (1) are disposed within the module housing.

10. A battery box, characterized in that, The battery module is disposed within the housing as described in claim 9; or, the battery module is disposed within the housing as described in any one of claims 1-8, including the housing, a plurality of the battery cells (1), and a battery thermal management device as described in any one of claims 1-8.

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