Battery pack and vehicle

Abstract

The utility model discloses a battery pack and a vehicle. The battery pack comprises a shell, a plurality of battery cell groups, a plurality of heat exchange devices and a heat management device, the plurality of battery cell groups are arranged in the shell, and each battery cell group comprises a plurality of battery cells; the plurality of heat exchange devices and the plurality of battery cells are alternately arranged along the thickness direction of the battery cells; the heat management device is arranged in the shell, the heat management device is electrically connected with the plurality of battery cell groups respectively, and the heat management device is independently connected with the plurality of heat exchange devices respectively. Therefore, the plurality of heat exchange devices are respectively contacted with the plurality of battery cell groups, the heat exchange of the battery cells is increased, and the heat conduction capability of the battery cells is improved. Meanwhile, the heat management device is connected with the plurality of heat exchange devices, so that each heat exchange device can be independently and dynamically adjusted, the dynamic adjustment of the temperature of the battery cells is realized, the temperature difference between the battery cells is further reduced, and the cycle service life of the battery pack is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery pack and a vehicle. Background Art

[0002] In the prior art, when the battery cells are placed in the battery pack, the side surface of the battery cell, that is, one side surface in the width direction of the battery cell, contacts the tray included in the battery pack, where the heat exchange device is placed. The heat exchange device contacts the side surfaces of multiple battery cells, which affects the heat exchange of the battery cells and results in low reliability and cycle life of the battery pack. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to provide a battery pack with good battery core temperature balance and long service life.

[0004] The second objective of the present invention is to provide a vehicle, comprising the above-mentioned battery pack.

[0005] According to the battery pack of the first aspect of the utility model, the battery pack includes: a shell, a plurality of battery cell groups, a plurality of heat exchange devices, and a thermal management device, wherein the plurality of battery cell groups are arranged in the shell, and each of the battery cell groups includes a plurality of battery cells; the plurality of heat exchange devices and the plurality of battery cells are alternately arranged along the thickness direction of the battery cells; the thermal management device is arranged in the shell, the thermal management device is electrically connected to the plurality of battery cell groups, and the thermal management device is independently connected to the plurality of heat exchange devices.

[0006] According to the battery pack of the embodiment of the utility model, multiple heat exchange devices are respectively in contact with multiple battery cell groups, which increases the heat exchange of the battery cells and improves the thermal conductivity of the battery cells. At the same time, by connecting the thermal management device with multiple heat exchange devices, each heat exchange device can be dynamically adjusted separately to achieve dynamic adjustment of the battery cell temperature, further reduce the temperature difference between the battery cells, and improve the cycle life of the battery pack.

[0007] In some embodiments, each of the battery cell groups includes a plurality of battery cells that are laid flat, and the plurality of battery cell groups are arranged along a thickness direction of the battery cells.

[0008] In some embodiments, the plurality of battery cells of the battery cell group are arranged along a width direction of the battery cells, and side surfaces of two adjacent battery cells are in contact with each other.

[0009] In some embodiments, the heat exchange device is provided between two adjacent battery cell groups.

[0010] In some embodiments, the heat exchange device is in contact with surfaces of the plurality of battery cells in adjacent battery cell groups.

[0011] In some embodiments, the heat exchange device includes: a cold plate and a heating element, wherein the cold plate is arranged between two adjacent battery cell groups; the heating element is arranged on a side of the battery cell group adjacent to the cold plate along the thickness direction of the battery cell; and / or the heating element is arranged on a side of the battery cell group away from the cold plate along the thickness direction of the battery cell.

[0012] In some embodiments, each of the battery cell groups includes a plurality of battery cells placed upright, the plurality of battery cells in the battery cell group are arranged along a thickness direction of the battery cell, and the plurality of battery cell groups are arranged along a width direction of the battery cell.

[0013] In some embodiments, a heat exchange device is provided between two adjacent battery cells in each battery cell group.

[0014] In some embodiments, the heat exchange device includes: a cold plate and a heating element, wherein the cold plate is arranged between two adjacent battery cells in the battery cell group; the heating element is arranged on a side of the battery cell adjacent to the cold plate along the thickness direction of the battery cell; and / or the heating element is arranged on a side of the battery cell away from the cold plate along the thickness direction of the battery cell.

[0015] In some embodiments, the heating element is a heating film.

[0016] In some embodiments, the thermal management device is disposed at one end of the plurality of battery cells in the battery cell group in the length direction.

[0017] In some embodiments, the plurality of battery cells of the battery cell group extend along the length direction of the shell, the plurality of battery cells of the battery cell group are arranged along the width direction of the shell, and the plurality of battery cell groups are arranged along the height direction of the shell.

[0018] In some embodiments, the shell includes: a tray and a sealing cover, wherein the sealing cover is disposed on the top of the tray, and the sealing cover and the tray define a accommodating space, and the plurality of battery cell groups, the plurality of heat exchange devices and the thermal management device are all disposed in the accommodating space.

[0019] The vehicle according to the second aspect of the present invention comprises the battery pack described in any one of the above embodiments.

[0020] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0022] Figure 1 It is a three-dimensional disassembly schematic diagram of a battery pack according to an embodiment of the utility model.

[0023] Figure 2 It is a schematic diagram of the arrangement of battery cells according to an embodiment of the utility model.

[0024] Figure 3 It is a schematic diagram of the arrangement of battery cells according to another embodiment of the utility model.

[0025] Figure 4 yes Figure 3 Schematic diagram of the enlarged P region.

[0026] Reference numerals:

[0027] 100. Battery pack;

[0028] 11. Tray; 12. Sealing cover;

[0029] 20. Battery cell group; 21. Battery cell;

[0030] 30. Heat exchange device;

[0031] 40. Thermal management device. DETAILED DESCRIPTION

[0032] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Figure 1-Figure 4 A battery pack 100 according to an embodiment of the present invention is described. The battery pack 100 includes: a housing, a plurality of battery cell groups 20 , a plurality of heat exchange devices 30 , and a thermal management device 40 .

[0033] Specifically, if Figure 1 As shown, multiple battery cell groups 20 are arranged in the shell, each battery cell group 20 includes multiple battery cells 21, and multiple heat exchange devices 30 and multiple battery cells 21 are alternately arranged along the thickness direction of the battery cells 21; the thermal management device 40 is arranged in the shell, the thermal management device 40 is electrically connected to the multiple battery cell groups 20, and the thermal management device 40 is independently connected to the multiple heat exchange devices 30.

[0034] In this embodiment, the battery cell 21 is a rectangular parallelepiped structure, and the two surfaces of the battery cell 21 along the thickness direction are the "large surfaces" of the battery cell 21, that is, the two side surfaces of the battery cell 21 in the thickness direction are the largest surfaces among the several surfaces of the battery cell 21. When multiple battery cells 21 are arranged to form each battery cell group 20, multiple battery cells 21 are arranged along the width direction of the battery cell 21, and the large surface of the battery cell 21 faces the bottom of the shell, that is, the battery cell 21 is placed horizontally. Among them, the area of ​​the two opposite surfaces in the thickness direction of the battery cell 21 is greater than the area of ​​the two opposite surfaces in the width direction of the battery cell 21, and the area of ​​the two opposite surfaces in the length direction of the battery cell 21. When multiple battery cells 21 form multiple battery cell groups 20, multiple battery cell groups 20 are arranged along the thickness direction of the battery cell 21, and the heat exchange device 30 and the battery cell group 20 are alternately arranged in the thickness direction of the battery cell 21, so that at least one side surface of each battery cell 21 along the thickness direction is in contact with the heat exchange device 30.

[0035] Alternatively, the multiple battery cells 21 in each battery cell group 10 are arranged along the thickness direction of the battery cell 21, the multiple battery cell groups 20 are arranged along the width direction of the battery cell 21, the heat exchange device 30 is located on at least one side in the thickness direction of the battery cell 21, and the multiple heat exchange devices 30 are all connected to the thermal management device 40, and the thermal management device 40 can independently control the multiple heat exchange devices 30.

[0036] According to the battery pack 100 of the embodiment of the utility model, the multiple heat exchange devices 30 are respectively in contact with the multiple battery cell groups 20, so as to increase the heat exchange of the battery cells 21 and improve the thermal conductivity of the battery cells 21. At the same time, by connecting the thermal management device 40 with the multiple heat exchange devices 30, each heat exchange device 30 can be dynamically adjusted separately to achieve dynamic adjustment of the temperature of the battery cells 21, further reduce the temperature difference between the battery cells 21, and improve the cycle life of the battery pack 100.

[0037] In some embodiments, Figure 1 As shown, each battery cell group 20 includes a plurality of battery cells 21 laid flat, and the plurality of battery cell groups 20 are arranged along the thickness direction of the battery cell 21. Here, laying the battery cell 21 flat means that the large surface of the battery cell 21, that is, the surface defined in the length direction and width direction of the battery cell 21, is placed along the height direction of the shell, that is, the surface defined in the length direction and width direction of the battery cell 21 is opposite to the bottom of the shell, and the plurality of battery cell groups 20 are stacked in the height direction of the shell. Therefore, laying the plurality of battery cells 21 flat in the battery cell group 20 can increase the stability of the installation of the battery cell 21, facilitate the setting of the heat exchange device 30 in the thickness direction of the battery cell 21, and facilitate the increase of the contact area between the battery cell 21 and the heat exchange device 30, thereby improving the heat exchange capacity of the battery cell 21, and facilitating the heat exchange device 30 to regulate the temperature of the battery cell 21.

[0038] In some embodiments, Figure 2As shown, the multiple cells 21 of the cell group 20 are arranged along the width direction of the cell 21, and the sides of two adjacent cells 21 are in contact with each other. That is, the multiple cells 21 in the cell group 20 are arranged along the width direction, and the surfaces defined by the length direction and thickness direction of two adjacent cells 21 are in close contact with each other, which can reduce the contact area between two adjacent cells 21 in the cell group 20, reduce the heat conduction between the cells 21, and reduce the temperature difference between the cells 21, which can effectively avoid the phenomenon of thermal runaway caused by the high temperature of some cells 21.

[0039] In some embodiments, Figure 1 As shown, a heat exchange device 30 is provided between two adjacent battery cell groups 20. For example, in this embodiment, the heat exchange device 30 can be provided between two adjacent battery cell groups 20 along the height direction of the shell, so as to increase the contact area between the battery cell group 20 and the heat exchange device 30, ensure that each battery cell 21 is in contact with the heat exchange device 30, increase the speed of adjusting the temperature of the battery cell 21, and make the temperature balance of the battery cell 21 better.

[0040] Optionally, among the multiple battery cell groups 20 arranged along the height direction of the shell, a heat exchange device 30 is arranged between every two battery cell groups 20, that is, after the multiple battery cell groups 20 are arranged, one side of each battery cell group 20 along the height direction is in contact with the heat exchange device 30 to realize heat exchange. While satisfying the heat exchange to realize the temperature regulation of the battery cell group 20, the setting of the heat exchange device 30 is reduced, and the space occupied by the heat exchange device 30 in the battery pack 100 is reduced, the number of battery cell groups 20 set can be increased, and the capacity of the battery pack 100 can be increased.

[0041] In some embodiments, the heat exchange device 30 contacts the surfaces of multiple battery cells 21 of adjacent battery cell groups 20. That is, the battery cell group 20 includes multiple battery cells 21 arranged along the width direction of the battery cells 21, and the heat exchange device 30 is arranged between two adjacent battery cell groups 20. The heat exchange device 30 contacts the multiple battery cells 21 included in the same battery cell group 20 to achieve synchronous heat exchange of the multiple battery cells 21, so as to improve the reliability of the battery pack 100.

[0042] In some embodiments, the heat exchange device 30 includes: a cold plate and a heating element, wherein the cold plate is disposed between two adjacent battery cell groups 20; and the heating element is disposed on one side of the battery cell group 20 adjacent to the cold plate along the thickness direction of the battery cell 21. When arranging multiple battery cell groups 20 and the heat exchange device 30, the heating element is laid on the battery cell group 20 and then the cold plate is laid, and the battery cell group 20 is laid on the cold plate after a layer of the heating element is laid, that is, heating elements are provided on both sides of the cold plate along the height direction of the shell, and the cold plate and the heating element are both disposed between two adjacent battery cell groups 20, so that the two adjacent battery cell groups 20 can be heated or cooled, the temperature of the battery cell 21 can be quickly adjusted, and the temperature of the battery cell 21 can be balanced.

[0043] Optionally, the heating element is disposed on a side of the cell group 20 away from the cold plate along the thickness direction of the cell 21. For example, for two adjacent cell groups 20, the cold plate is disposed between the two adjacent cell groups 20, and the heating element is disposed on a side of the two cell groups 20 away from the cold plate, that is, the cold plate and the heating element are respectively disposed on both sides of the cell group 20 along the thickness direction of the cell 21 to adjust the temperature of the cell 21.

[0044] In other embodiments, Figure 3 and Figure 4 As shown, each battery cell group 20 includes multiple battery cells 21 placed upright, and the multiple battery cells 21 of the battery cell group 20 are arranged along the thickness direction of the battery cell 21, and multiple battery cell groups 20 are arranged along the width direction of the battery cell 21. That is, the multiple battery cells 21 included in the same battery cell group 20 are arranged along the thickness direction of the battery cell 21, and the surface defined by the length direction and thickness direction of the battery cell 21 is opposite to the bottom of the shell, and the surface defined by the length direction and width direction of the battery cell 21 is opposite to the side wall of the shell, that is, the large surface of the battery cell 21 is distributed along the length direction or width direction of the shell.

[0045] In addition, a heat exchange device 30 is provided between two adjacent battery cells 21 of each battery cell group 20. The heat exchange device 30 is provided between two adjacent battery cells 21, that is, at this time, a plurality of heat exchange devices 30 are provided in each battery cell group 20, and at least one surface of the battery cells 21 in the battery cell group 20 along the thickness direction of the battery cells 21 is in contact with the heat exchange device 30.

[0046] In this embodiment, the heat exchange device 30 also includes a cold plate and a heating element, the cold plate is arranged between two adjacent battery cells 21 of the battery cell group 20, and the heating element is arranged on one side of the battery cell 21 adjacent to the cold plate along the thickness direction of the battery cell 21. For example, for two adjacent battery cells 21 of the same battery cell group 20, the cold plate is arranged between the two adjacent battery cells 21, the heating element is also arranged between the two adjacent battery cells 21, and the heating element is arranged between the cold plate and the battery cell 21 on the corresponding side.

[0047] Alternatively, the heating element is disposed on the side of the battery cell 21 away from the cold plate along the thickness direction of the battery cell 21. For example, for two adjacent battery cells 21, the cold plate is disposed between the two adjacent battery cells 21, and the heating element is disposed on the side of the two battery cells 21 away from the cold plate. That is, the cold plate and the heating element are disposed on both sides of the battery cell 21 along the thickness direction of the battery cell 21. Optionally, the heating element is a heating film. In this way, the thickness of the arrangement between the battery cell groups 20 can be reduced, the utilization of the space in the battery pack 100 can be improved, and the miniaturized design of the battery pack 100 is facilitated.

[0048] In some embodiments, Figure 2As shown, the thermal management device 40 is disposed at one end of the length direction of the plurality of battery cells 21 of the battery cell group 20. Therefore, the thermal management device 40 is conveniently connected to the plurality of battery cells 21 to monitor the plurality of battery cells 21, thereby independently controlling the cold plate and the heating element to perform temperature management control, thereby ensuring the temperature balance of the battery cell group 20. At the same time, it is convenient to reasonably distribute the battery cell group 20 and the thermal management device 40 in the battery pack 100, thereby improving the utilization rate of the space in the battery pack 100.

[0049] In some embodiments, Figure 1 and Figure 2 As shown, the multiple cells 21 of the cell group 20 extend along the length direction of the shell, the multiple cells 21 of the cell group 20 are arranged along the width direction of the shell, and the multiple cell groups 20 are arranged along the height direction of the shell. That is, the multiple cells 21 are arranged along the width direction of the shell to form the cell group 20, and the multiple cell groups 20 are arranged along the height direction of the shell, which can increase the density of the cells 21 arranged in the shell, increase the contact area between the cells 21 and the heat exchange device 30, and improve the heat exchange capacity of the cells 21.

[0050] In some embodiments, Figure 1 As shown, the housing includes: a tray 11, a sealing cover 12, the sealing cover 12 is arranged on the top of the tray 11, the sealing cover 12 and the tray 11 define a storage space, and multiple battery cell groups 20, multiple heat exchange devices 30 and thermal management devices 40 are all arranged in the storage space. That is, the sealing cover 12 and the tray 11 define a storage space for accommodating multiple battery cell groups 20, when multiple battery cells 21 in the battery cell group 20 are placed horizontally, the multiple battery cell groups 20 and the heat exchange devices 30 are alternately arranged in the storage space along the height direction of the housing, and when multiple battery cells 21 in the battery cell group 20 are placed vertically, the multiple battery cell groups 20 and the heat exchange devices 30 are alternately arranged in the storage space along the length direction or width direction of the housing.

[0051] The thermal management device 40 is arranged at one end of the length direction of the shell, that is, the length direction of the battery cell 21, and the thermal management device 40 and the sealing cover 12 are placed at the end to seal the battery pack 100. The thermal management device 40 is electrically connected to the multiple heat exchange devices 30 respectively, and can monitor the temperature or pressure of the multiple battery cells 21 and adjust the corresponding heat exchange device 30 according to the preset temperature threshold or pressure threshold range to keep the corresponding battery cell 21 within the preset temperature or pressure range, so as to maintain the performance of the battery cell 21 and the safety of the battery pack 100.

[0052] A vehicle according to an embodiment of the second aspect of the utility model comprises a battery pack 100 according to any one of the above embodiments.

[0053] According to the vehicle of the embodiment of the utility model, by rearranging the multiple battery cells 21 in the battery pack 100 set in the vehicle, so that the surface in the thickness direction is opposite to the heat exchange device 30, the contact area between the battery cell 21 and the heat exchange device 30 is increased, and the heat exchange is improved. At the same time, the contact area between two adjacent battery cells 21 can be reduced, and the heat conduction between two adjacent battery cells 21 in the battery cell group 20 is reduced, so that the temperature between the battery cells 21 and the battery cells 21 is more balanced. And through the setting of the thermal management device 40, the temperature of the battery cell 21 can be actively adjusted. For example, the battery pack 100 has a self-checking function after startup. After detecting the temperature of each battery cell 21, the thermal management device 40 dynamically adjusts the heat exchange device 30 to increase the speed of balancing the temperature of the battery cell 21, thereby improving the safety of vehicle use while improving the safety of battery pack 100.

[0054] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0055] In the description of the present utility model, "first feature" and "second feature" may include one or more of the features. In the description of the present utility model, "plurality" means two or more. In the description of the present utility model, the first feature "above" or "below" the second feature may include the first and second features being in direct contact, or the first and second features being in contact not directly but through another feature between them. In the description of the present utility model, the first feature "above", "above" and "above" the second feature include the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature.

[0056] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example.

[0057] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery pack, characterized in that: include: case; A plurality of battery cell groups, wherein the plurality of battery cell groups are arranged in the housing, and each of the battery cell groups includes a plurality of battery cells; A plurality of heat exchange devices, wherein the plurality of heat exchange devices and the plurality of battery cells are alternately arranged along a thickness direction of the battery cells; A thermal management device is disposed in the housing, the thermal management device is electrically connected to the plurality of battery cell groups, and the thermal management device is independently connected to the plurality of heat exchange devices.

2. The battery pack according to claim 1, characterized in that: The multiple battery cells included in each battery cell group are laid flat, and the multiple battery cell groups are arranged along the thickness direction of the battery cells.

3. The battery pack according to claim 2, characterized in that: The plurality of cells in the cell group are arranged along a width direction of the cells, and side surfaces of two adjacent cells are in contact with each other.

4. The battery pack according to claim 1, characterized in that: The heat exchange device is provided between two adjacent battery core groups.

5. The battery pack according to claim 1, characterized in that: The heat exchange device contacts surfaces of the plurality of battery cells in the adjacent battery cell groups.

6. The battery pack according to claim 2, characterized in that: The heat exchange device comprises: A cold plate, the cold plate being arranged between two adjacent battery cell groups; A heating element, the heating element being arranged on a side of the battery cell group adjacent to the cold plate along the thickness direction of the battery cell; and / or The heating element is arranged on a side of the battery cell group away from the cold plate along the thickness direction of the battery cell.

7. The battery pack according to claim 1, characterized in that: Each of the battery cell groups comprises a plurality of battery cells which are placed upright, the plurality of battery cells in the battery cell group are arranged along a thickness direction of the battery cell, and the plurality of battery cell groups are arranged along a width direction of the battery cell.

8. The battery pack according to claim 1, characterized in that: A heat exchange device is provided between two adjacent battery cells in each battery cell group.

9. The battery pack according to claim 7, characterized in that: The heat exchange device comprises: A cold plate, the cold plate being arranged between two adjacent cells of the cell group; a heating element, the heating element being arranged on a side of the battery core adjacent to the cold plate along the thickness direction of the battery core; and / or The heating element is arranged on a side of the battery core away from the cold plate along the thickness direction of the battery core.

10. The battery pack according to claim 6 or 9, characterized in that: The heating element is a heating film.

11. The battery pack according to claim 1, characterized in that: The thermal management device is disposed at one end of the plurality of battery cells in the battery cell group in the length direction.

12. The battery pack according to claim 1, characterized in that: The plurality of battery cells of the battery cell group extend along the length direction of the shell, the plurality of battery cells of the battery cell group are arranged along the width direction of the shell, and the plurality of battery cell groups are arranged along the height direction of the shell.

13. The battery pack according to claim 1, characterized in that: The housing comprises: tray; A sealing cover is arranged on the top of the tray, and the sealing cover and the tray define a containing space, and the plurality of battery cell groups, the plurality of heat exchange devices and the thermal management device are all arranged in the containing space.

14. A vehicle, characterized in that: A battery pack comprising any one of claims 1-13.

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