Heat exchange device and battery pack

Abstract

The utility model provides a heat exchange device and a battery pack, the heat exchange device comprises a cooling assembly and at least one heating assembly, and the cooling assembly and each heating assembly are respectively arranged on two opposite sides of a corresponding battery cell group and are connected to the battery cell group in a heat conduction manner; the cooling assembly and the heating assembly are arranged on the two sides of the same battery cell group respectively, so that the cooling assembly and the heating assembly independently cool and heat the battery cell group, the cooling assembly and the heating assembly do not interfere with each other, and non-uniform cooling and heating of the battery cells are avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to power battery technical field, concretely relates to a heat exchange device, battery package. BACKGROUND

[0002] In the related art, the cooling and heating of the battery cell are respectively realized by a cooling assembly and a heating assembly, and the heating assembly needs to be adhered between the cooling assembly and the battery cell. In the cooling process, the heating film is cooled first by the cooling assembly, resulting in uneven cooling of the battery cell. When heating, the heating assembly is attached to both sides of the cold plate, so that the temperature rise in the central region is higher than that in the edge region, resulting in a large temperature difference.

[0003] Therefore, the heat exchange device in the related art has the technical problem of mutual interference between the cold plate and the heating film, resulting in uneven cooling and heating. SUMMARY

[0004] The embodiments of the utility model provide a heat exchange device and a battery package, which can solve the technical problem of uneven cooling and heating caused by mutual interference between the cold plate and the heating film in the prior art.

[0005] In a first aspect, the embodiments of the utility model provide a heat exchange device for heat exchange for at least one battery cell group, characterized in that it comprises a cooling assembly and at least one heating assembly, wherein the cooling assembly and each heating assembly are respectively arranged on opposite sides of the corresponding battery cell group and are thermally connected to the battery cell group.

[0006] In an embodiment, the at least one battery cell group comprises two battery cell groups, and the at least one heating assembly comprises two heating assemblies. The cooling assembly is arranged between the two battery cell groups and is thermally connected to the two battery cell groups. Each heating assembly is arranged on a side of the corresponding battery cell group away from the adjacent battery cell group and is thermally connected to the battery cell group.

[0007] In an embodiment, the cooling assembly comprises a cold plate, and each battery cell group comprises a plurality of battery cells. The cold plate is thermally connected to the corresponding battery cell group.

[0008] In an embodiment, along the axial direction of the battery cell, the ratio of the size of the cold plate to the size of the battery cell ranges from 60% to 70%.

[0009] In an embodiment, a gap is provided between the cold plate and the battery cell group to fill a thermally conductive member. The width of the gap ranges from 1 mm to 2 mm.

[0010] In an embodiment, the heating assembly comprises at least one heating row, each of the heating rows comprises a plurality of heating films arranged at intervals; each of the cell groups comprises at least one cell row, each of the cell rows comprises a plurality of cells; wherein the heating films of each of the heating rows are connected to the cells of the corresponding cell row in a heat-conducting manner.

[0011] In an embodiment, along the axial direction of the cell, the ratio of the size of the heating film to the size of the cell ranges from 65% to 75%.

[0012] In an embodiment, at least one of the heating rows comprises two heating rows; wherein along the axial direction of the cell, the spacing between the two adjacent heating rows ranges from 63 mm to 73 mm.

[0013] In an embodiment, the adjacent heating rows are arranged at equal intervals.

[0014] In a second aspect, the embodiments of the utility model provide a battery pack comprising the heat exchange device according to any one of the above embodiments.

[0015] The embodiments of the utility model have the advantages of:

[0016] In the embodiments of the utility model, the cooling assembly and the heating assembly are arranged on the two sides of the same cell group respectively, so that the cooling assembly and the heating assembly independently cool and heat the cell group, and the cooling assembly and the heating assembly do not interfere with each other, thereby relieving the technical problem that the cooling and heating are uneven due to the interference between the cold plate and the heating film in the prior art heat exchange device. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the utility model, the drawings needed in the embodiment description will be briefly introduced, and obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained by those skilled in the art without creative labor.

[0018] Figure 1 is the three-dimensional schematic view of the heat exchange device and the cell group provided by the embodiments of the utility model;

[0019] Figure 2 is the cross-sectional schematic view of the heat exchange device and the cell group provided by the embodiments of the utility model. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative efforts fall within the scope of the present application. In addition, it should be understood that the specific implementation described herein is only used to illustrate and explain the present application, and is not used to limit the present application. In the present application, the orientation words such as "upper" and "lower" generally refer to the upper and lower directions of the device in the actual use or working state, and specifically refer to the drawing direction in the drawings. The "inner" and "outer" refer to the outline of the device.

[0021] In addition, the terms "first", "second", and similar words do not represent any order, quantity, or importance, but are only used to distinguish different technical features. The term "multiple" and similar words represent two or more, unless otherwise explicitly limited.

[0022] Please refer to Figure 1 、 Figure 2 The heat exchange device provided by the embodiments of the present application is used for heat exchange for at least one battery cell group, comprising a cooling assembly 2 and at least one heating assembly 1, wherein the cooling assembly 2 and each heating assembly 1 are respectively arranged on opposite sides of the corresponding battery cell group and are heat-conductively connected to the battery cell group.

[0023] Among them, the cooling assembly 2 and each heating assembly 1 are respectively arranged on opposite sides of the corresponding battery cell group along the thickness direction.

[0024] Among them, the cooling assembly 2 and the heating assembly 1 are not directly connected.

[0025] In the present embodiment, by arranging the cooling assembly 2 and the heating assembly 1 on the two sides of the same battery cell group, the cooling assembly 2 and the heating assembly 1 independently cool and heat the battery cell group, and the cooling assembly 2 and the heating assembly 1 do not interfere with each other, avoiding the interference between the cold plate 21 and the heating film 10 in the heat exchange device, resulting in uneven cooling and heating.

[0026] The technical solutions of the present application will be described in conjunction with specific embodiments.

[0027] In an embodiment, please refer to Figure 1 The cooling assembly 2 and the heating assembly 1 are arranged on the two sides of each layer of battery cell group and do not interfere with each other, and the cooling assembly 2 and the heating assembly 1 independently exchange heat with the battery cell group.

[0028] The mutual non-interference means that when the cooling assembly 2 cools the battery cell group, the battery cell group can be directly cooled without being blocked by the heating assembly 1; and when the heating assembly 1 heats the battery cell group, the battery cell group can be directly heated without being blocked by the cooling assembly 2.

[0029] In the embodiment, by allowing the cooling assembly 2 and the heating assembly 1 to exchange heat with the battery cell group independently, the mutual interference between the cooling assembly 2 and the heating assembly 1 is avoided, so that the cooling and heating are not uniform.

[0030] In an embodiment, the at least one battery cell group includes two battery cell groups; the at least one heating assembly 1 includes two heating assemblies 1; the cooling assembly 2 is arranged between the two battery cell groups and is in thermal conduction connection with the two battery cell groups; and each heating assembly 1 is arranged on a side of the corresponding battery cell group away from the adjacent battery cell group and is in thermal conduction connection with the battery cell group.

[0031] The two battery cell groups are arranged in a stack along the thickness direction, and the heating assembly 1 and the cooling assembly 2 are arranged on two sides of the battery cell group along the thickness direction, respectively.

[0032] The two heating assemblies 1 are arranged on the side surfaces of the two battery cell groups away from the cooling assembly 2, respectively.

[0033] It can be understood that the two battery cell groups, the two heating assemblies 1 and the cooling assembly 2 form a minimum repeating unit; when the number of the battery cell groups is even, the arrangement relationship between the battery cell group, the heating assembly 1 and the cooling assembly 2 is the same as that of the two battery cell groups, i.e., a stack structure of a plurality of the minimum repeating units along the thickness direction.

[0034] It can be understood that when the number of the battery cell groups is odd, the heating assembly 1 and the cooling assembly 2 only need to be arranged on two sides of any battery cell group along the thickness direction, and the heating assembly 1 and the cooling assembly 2 cannot be simultaneously arranged between the adjacent two battery cell groups to avoid mutual interference or obstruction of the heating assembly 1 and the cooling assembly 2 during heating or cooling, so that the heating assembly 1 and the cooling assembly 2 are directly in thermal conduction connection with the battery cell group.

[0035] It should be noted that when the heating assembly 1 can also be shared by two layers of battery cell groups, the heating assembly 1 can also be arranged between the adjacent two layers of battery cell groups, and the cooling assembly 2 can be arranged on the side surface of the two side battery cell groups away from the heating assembly 1.

[0036] In the embodiment, when only two layers of battery cell groups are arranged, the two layers of battery cell groups, the corresponding cooling assembly 2 and the heating assembly 1 form a minimum repeating unit, and a shared cooling assembly 2 or heating assembly 1 can be arranged between the adjacent two layers of battery cell groups, so that one cooling assembly 2 or heating assembly 1 is saved, and the cost is reduced.

[0037] In an embodiment, cooling assemblies 2 or heating assemblies 1 are arranged between two adjacent cell groups, and the cooling assemblies 2 and the heating assemblies 1 are arranged in an alternating manner.

[0038] The arrangement can be: a heating assembly 1, a cell group on one side of the heating assembly 1 in the thickness direction, a cooling assembly 2 on one side of the cell group in the thickness direction, another cell group on one side of the cooling assembly 2 in the thickness direction, and another heating assembly 1 on one side of the another cell group in the thickness direction.

[0039] The arrangement can also be: a cooling assembly 2, a cell group on one side of the cooling assembly 2 in the thickness direction, a heating assembly 1 on one side of the cell group in the thickness direction, another cell group on one side of the heating assembly 1 in the thickness direction, and another cooling assembly 2 on one side of the another cell group in the thickness direction.

[0040] In an embodiment, the cooling assembly 2 comprises a cold plate 21, and each cell group comprises a plurality of cells 3, wherein the cold plate 21 is thermally connected to the corresponding cell group.

[0041] The cell 3 can be a circular cell or a square cell.

[0042] The cooling assembly 2 further comprises a refrigerant pipeline, which is in thermal connection with the cold plate 21, and the refrigerant pipeline comprises a main stem 22 and branches 23 that are in communication with each other, and the cold plate 21 is directly connected to the branches 23.

[0043] The aperture of the main stem 22 is greater than or equal to the aperture of the branches 23.

[0044] The aperture of the main stem 22 ranges from 4 mm to 5 mm.

[0045] The aperture of the main stem 22 can be any one of 4 mm, 4.5 mm, and 5 mm.

[0046] It can be understood that the temperature of the cold plate 21 is reduced by the refrigerant in the refrigerant pipeline absorbing heat, and the temperature of the cell 3 in thermal connection with the cold plate 21 is also reduced, and the refrigerant can be R134a.

[0047] In an embodiment, in the axial direction of the cell 3, the ratio of the size of the cold plate 21 to the size of the cell 3 ranges from 60% to 70%.

[0048] The ratio of the size of the cold plate 21 to the size of the cell 3 can be any one of 60%, 62%, 65%, 68%, and 70%.

[0049] The cold plate 21 is arranged on the outside of the side surface of the cell 3.

[0050] The cold plate 21 can be any one of a cuboid structure, a prism structure, or a square structure.

[0051] It can be understood that, in the range of 60% to 70%, the greater the ratio of the size of the cold plate 21 to the size of the battery cell 3, the better the cooling effect of the cold plate on the battery cell.

[0052] It can be understood that, along the axial direction of the battery cell 3, the thickness ratio of the cold plate 21 to the circular battery cell 3 is about 60% to 70%, and when the ratio of the size of the cold plate 21 to the size of the battery cell 3 is greater than 70%, it will affect the electrical safety, and when the ratio of the size of the cold plate 21 to the size of the battery cell 3 is less than 60%, it will affect the cooling effect.

[0053] In this embodiment, by setting the ratio of the size of the cold plate 21 to the size of the battery cell 3 in the range of 60% to 70%, the cooling effect is improved while ensuring electrical safety.

[0054] In an embodiment, the cold plate 21 and the battery cell group have a gap to fill the heat-conducting member, and the width of the gap ranges from 1 mm to 2 mm.

[0055] The gap refers to the space between the cold plate 21 and the battery cell group, and the width range of the gap refers to the value range of the minimum distance between the cold plate 21 and the battery cell group.

[0056] The width of the gap can be any one of 1 mm, 1.2 mm, 1.5 mm, 1.8 mm, or 2 mm.

[0057] It can be understood that when the width of the gap is less than 1 mm, the heat-conducting glue will be uneven, resulting in heat transfer deviation, and when the width of the gap is greater than 2 mm, the local heat-conducting glue will be too thick, also causing uneven heat conduction.

[0058] In this embodiment, by setting the width of the gap in the range of 1 mm to 2 mm, the uneven heat conduction caused by the heat-conducting glue being too thin or too thick is avoided, thereby avoiding the existence of heat transfer deviation.

[0059] In an embodiment, the heating assembly 1 includes at least one heating row, each heating row including a plurality of heating films 10 arranged at intervals; each battery cell group includes at least one battery cell row, each battery cell row including a plurality of battery cells 3; wherein the heating film 10 of each heating row is thermally connected to the battery cell 3 of the corresponding battery cell row.

[0060] The battery cell group includes a plurality of rows of battery cells 3 arranged along the axial direction of the battery cell 3, and a plurality of columns of battery cells 3 arranged perpendicular to the axial direction of the battery cell 3, and any column of battery cells 3 is a battery cell row.

[0061] The heating assembly 1 comprises a plurality of columns of heating films 10 arranged along the axial direction perpendicular to the battery cell 3, and each column of heating films 10 is a heating row.

[0062] The heating film 10 is attached to the circumferential side surface of the battery cell 3, and the shape of the heating film 10 can be similar to that of the side surface of the battery cell 3.

[0063] The heating film 10 can be connected to the battery cell 3 by thermal compression, and the heating film 10 can also be connected to the battery cell 3 by a glue layer.

[0064] The contact surface between the heating film 10 and the side surface of the battery cell 3 can be an arc surface.

[0065] It can be understood that the heating film 10 is arranged one-to-one corresponding to the battery cell 3, specifically, the heating film 10 can be formed on the outside of the side surface of the battery cell 3 when the battery cell 3 is prepared, so that the heating film 10 is attached to the side surface of the battery cell 3, the contact area between the heating film 10 and the battery cell 3 is increased, and the heat transfer efficiency is enhanced.

[0066] It can be understood that a bonding layer can be formed between the heating film 10 and the side surface of the battery cell 3 by thermal compression, the bonding layer is formed on the surface of the heating film 10 on the side of the battery cell 3 in the thermal compression state, and is used to realize the connection between the heating film 10 and the battery cell 3, and the bonding layer has thermal conductivity.

[0067] In the embodiment, by arranging the heating film 10 as a plurality of columns of battery cell rows, each heating film 10 is arranged corresponding to each battery cell 3, so that each heating film 10 heats each battery cell 3 individually, and the heat transfer efficiency is enhanced.

[0068] In an embodiment, along the axial direction of the battery cell 3, the ratio of the size of the heating film 10 to the size of the battery cell 3 is in the range of 65% to 75%.

[0069] The ratio of the size of the heating film 10 to the size of the battery cell 3 can be any one of 65%, 68%, 70%, 72%, and 75%.

[0070] It can be understood that within the range of 65% to 75%, the greater the ratio of the size of the heating film 10 to the size of the battery cell 3, the higher the temperature conduction efficiency of heating.

[0071] It can be understood that along the axial direction of the battery cell 3, the thickness ratio of the heating film 10 to the battery cell 3 is about 65% to 75%, when the ratio of the size of the heating film 10 to the size of the battery cell 3 is greater than 75%, the electrical safety will be affected, and when the ratio of the size of the heating film 10 to the size of the battery cell 3 is less than 65%, the temperature conduction efficiency of heating will be affected.

[0072] In the embodiment, by setting the ratio of the size of the heating film 10 to the size of the battery cell 3 to be in the range of 65% to 75%, the temperature conduction efficiency of heating is improved without affecting the electrical safety.

[0073] In an embodiment, the heating assembly 1 can also be a heating pipeline.

[0074] In an embodiment, the cooling assembly 2 is a cooling pipeline, and the heating pipeline and the cooling pipeline are not in communication, and the difference between the two is that the medium in the heating pipeline can release heat to increase the temperature, while the coolant in the cooling pipeline can absorb heat to reduce the temperature.

[0075] In an embodiment, the heating pipeline is in thermal contact with the battery cell 3.

[0076] In an embodiment, adjacent battery cell groups can share a heating pipeline.

[0077] In the embodiment, by using a heating pipeline to heat the battery cell groups, adjacent battery cell groups can share the same heating pipeline or cooling pipeline, thereby further simplifying the structure of the heat exchange device to reduce the cost.

[0078] In an embodiment, the at least one heating row includes two heating rows, and the spacing between the adjacent two heating rows in the axial direction of the battery cell 3 is in the range of 63 mm to 73 mm.

[0079] In an embodiment, the spacing between the adjacent two heating rows can be any one of 63 mm, 65 mm, 68 mm, 71 mm, and 73 mm.

[0080] In an embodiment, the sizes of the plurality of heating films 10 can be the same.

[0081] In an embodiment, the heating film 10 is centrally symmetric.

[0082] In an embodiment, the center lines of the plurality of heating films 10 in the row direction coincide, and the row direction is the axial direction of the battery cell 3.

[0083] In an embodiment, the center lines of the plurality of heating films 10 in the column direction coincide, and the column direction is the arrangement direction of the battery cell row or the heating row.

[0084] In an embodiment, the spacing between the two heating rows refers to the minimum distance between the two heating rows.

[0085] In an embodiment, the adjacent heating rows are arranged at equal intervals.

[0086] In the embodiment, the spacing between the adjacent two heating rows is in the range of 63 mm to 73 mm, which improves the temperature conduction efficiency of heating without affecting the electrical safety.

[0087] In the embodiment, the heating effect of the heating assembly 1 is more uniform by arranging the heating rows at equal intervals, so as to maintain the consistency of the temperature of the battery cells 3.

[0088] In an embodiment, each battery cell group comprises at least one battery cell row, each battery cell row comprises a plurality of battery cells 3; the cooling assembly 2 comprises a plurality of cooling plates 21, each cooling plate 21 is connected in heat conduction to the battery cells 3 of the corresponding battery cell row; the heating assembly 1 comprises at least one heating row, each heating row comprises a plurality of heating films 10 arranged at intervals, and the heating films 10 of each heating row are connected in heat conduction to the battery cells 3 of the corresponding battery cell row; wherein the center line of each cooling plate 21, the axis of the corresponding battery cell 3, and the center line of the corresponding heating film 10 are coplanar.

[0089] In a second aspect, the embodiments of the utility model provide a battery pack, comprising the heat exchange device of any one of the above embodiments.

[0090] The battery pack comprises the heat exchange device, and the battery cell group between the cooling assembly 2 and the heating assembly 1 in the heat exchange device.

[0091] The battery pack comprises a plurality of battery cell groups, and each battery cell group is provided with at least one heating assembly 1 and one cooling assembly 2 for cooling and heating respectively.

[0092] The plurality of battery cells 3 are arranged in an array and are electrically connected to each other.

[0093] The application designs the positions of the heating assembly 1 and the cooling assembly 2, so that the heating assembly 1 and the cooling assembly 2 are located on opposite sides of the same battery cell group and do not interfere with each other to heat and cool the battery cell group. Since the heating assembly 1 and the cooling assembly 2 are not directly connected, the heating assembly 1 can directly heat the battery cell group, and the cooling assembly 2 can directly cool the battery cell group, avoiding the interference or obstruction of the heating assembly 1 and the cooling assembly 2, which leads to uneven cooling and heating.

[0094] The embodiments of the utility model are described in detail above, and the principle and implementation mode of the utility model are described by applying specific examples. The above embodiment description is only used to help understand the method and core idea of the utility model; meanwhile, for those skilled in the art, the specific implementation mode and application range will be changed according to the idea of the utility model. In conclusion, the content of the specification should not be understood as a limitation of the utility model.

Claims

1. A heat exchange device for exchanging heat for at least one battery cell group, characterized in that, The cooling assembly and each of the heating assemblies are respectively arranged on opposite sides of the corresponding cell group and are thermally connected to the cell group; The at least one cell group comprises two cell groups, and the cooling assembly is arranged between the two cell groups and is thermally connected to the two cell groups.

2. The heat exchange device according to claim 1, wherein The at least one heating assembly comprises two heating assemblies, and each of the heating assemblies is arranged on a side of the corresponding cell group away from the adjacent cell group and is thermally connected to the cell group.

3. The heat exchange device according to claim 1 or 2, characterized in that The cooling assembly comprises a cold plate, and each of the cell groups comprises a plurality of cells, wherein the cold plate is thermally connected to the corresponding cell group.

4. The heat exchange device according to claim 3, wherein The ratio of the size of the cold plate to the size of the cell along the axial direction of the cell ranges from 60% to 70%.

5. The heat exchange device according to claim 3, wherein The cooling assembly and the cell group have a gap for filling a thermally conductive member, and the width of the gap ranges from 1 mm to 2 mm.

6. The heat exchange device according to claim 1 or 2, wherein The heating assembly comprises at least one heating row, and each of the heating rows comprises a plurality of heating films arranged at intervals; each of the cell groups comprises at least one cell row, and each of the cell rows comprises a plurality of cells; wherein the heating films of each of the heating rows are thermally connected to the cells of the corresponding cell row.

7. The heat exchange device according to claim 6, wherein The ratio of the size of the heating film to the size of the cell along the axial direction of the cell ranges from 65% to 75%.

8. The heat exchange device according to claim 6, wherein The at least one heating row comprises two heating rows, and the spacing between the two adjacent heating rows along the axial direction of the cell ranges from 63 mm to 73 mm.

9. The heat exchange device according to claim 6, wherein The adjacent heating rows are arranged at equal intervals.

10. A battery pack, characterized by, The heat exchange device comprises the heat exchange device according to any one of claims 1 to 9.

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