Battery pack and vehicle

Abstract

The utility model relates to the technical field of power batteries, and discloses a battery pack and a vehicle, the battery pack comprises a battery cell, a liquid cooling plate and a heating plate, the liquid cooling plate is arranged below the battery cell, the upper surface of the liquid cooling plate is attached to the lower surface of the battery cell, the heating plate is arranged below the liquid cooling plate, and the liquid cooling plate is arranged below the heating plate. The heating plate is attached to the lower surface of the liquid cooling plate; the heating plate is arranged on the lower surface of the liquid cooling plate, and the lower surface of the battery cell is in direct contact with the liquid cooling plate, so that when the battery cell needs to be heated, the cooling liquid in the liquid cooling plate can be heated through the heating plate, and the liquid cooling plate automatically increases the temperature of the cooling liquid, and the battery cell is heated in two modes together; not only can the heating efficiency of the battery cell be ensured, but also the problem of local overheating of the battery cell caused by direct contact between the heating plate and the battery cell can be avoided; and the gradually heated cooling liquid also can uniformly heat the battery cell.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power batteries, in particular to a battery pack and a vehicle. BACKGROUND

[0002] At present, in order to make the battery pack in a suitable working environment, a liquid cooling plate and a heating plate are usually arranged on the battery cell. When the BMS (English full name: BATTERY MANAGEMENT SYSTEM, Chinese full name: battery management system) detects that the temperature of the battery cell exceeds a certain value, the liquid cooling plate is used to cool the battery cell. When the BMS detects that the temperature of the battery cell is lower than a certain value, the heating plate or the cooling liquid in the heated cooling plate is used to heat the battery cell, so that the temperature of the battery cell is maintained in a certain range.

[0003] However, both of the above-mentioned heating methods for the battery cell have defects. The method of heating the cooling liquid in the liquid cooling plate can make the battery cell uniformly heated, but it takes a period of time to heat the cooling liquid, which increases the time required for the battery cell to heat to the appropriate temperature and reduces the heating efficiency of the battery cell. The method of using the heating plate has high heating efficiency, but it can cause uneven heating of the battery cell and damage to the local battery cell. CONTENT OF THE UTILITY MODEL

[0004] The purpose of the present application is to provide a battery pack and a vehicle which can not only ensure that the battery cell is at a suitable working temperature, but also ensure that the heating efficiency is high and the battery cell is uniformly heated when the battery cell is heated.

[0005] In order to achieve the above-mentioned purpose, the present application provides a battery pack, comprising: a battery cell, a liquid cooling plate and a heating plate, the liquid cooling plate is arranged below the battery cell, and the upper surface of the liquid cooling plate is attached to the lower surface of the battery cell, the heating plate is arranged below the liquid cooling plate, and the heating plate is attached to the lower surface of the liquid cooling plate.

[0006] Optionally, the heating plate comprises a heat-conducting layer and an encapsulating layer, the heat-conducting layer is arranged inside the encapsulating layer, and the encapsulating layer is attached to the lower surface of the liquid cooling plate.

[0007] Optionally, the thickness of the encapsulating layer is M, and 0.01mm≤M≤30mm.

[0008] Optionally, the thermal conductivity of the heat-conducting layer is N, and N<10W / m·k.

[0009] Optionally, it further comprises a box body, and the battery cell, the liquid cooling plate and the heating plate are arranged in the box body.

[0010] Optionally, it further comprises an insulating plate, and the insulating plate is arranged between the heating plate and the bottom of the box body.

[0011] Optionally, the box body comprises a top cover, a frame and a bottom guard plate, the top and bottom of the frame are both provided with openings, the top cover is connected to the top opening of the frame, and the bottom guard plate is connected to the bottom opening of the frame; the battery cell is located in the interior of the frame; the bottom guard plate is provided with a containing groove on one side surface thereof facing the frame, and the liquid cooling plate and the heating plate are both located in the containing groove.

[0012] Optionally, the box body further comprises a mounting piece, the bottom edge of the frame is provided with a first extension part extending horizontally and outwardly, the top edge of the bottom guard plate is provided with a second extension part extending horizontally and outwardly, the first extension part and the second extension part are oppositely arranged, the first extension part is provided with a first mounting hole, the second extension part is provided with a second mounting hole oppositely arranged with the first mounting hole, and the mounting piece sequentially passes through the second mounting hole and the first mounting hole to fix the bottom guard plate on the frame.

[0013] Optionally, the liquid cooling plate comprises a liquid cooling part and a mounting part, the mounting part is arranged on the outer circumferential side of the liquid cooling part, the upper surface of the liquid cooling part is attached to the battery cell, and the mounting part is fixed to the lower surface of the frame.

[0014] In order to achieve the same purpose, the application also provides a vehicle comprising a battery management system and a battery pack as described above, and the battery cell, the liquid cooling plate and the heating plate are electrically connected with the battery management system respectively.

[0015] Compared with the prior art, the battery pack and the vehicle of the application have the beneficial effects that by arranging the heating plate on the lower surface of the liquid cooling plate, the lower surface of the battery cell directly contacts the liquid cooling plate, so that when the battery cell needs to be heated, the cooling liquid in the liquid cooling plate can be heated by the heating plate, and the temperature of the cooling liquid in the liquid cooling plate can be increased by the liquid cooling plate, and the two ways jointly heat the battery cell, which can not only ensure the heating efficiency of the battery cell, but also avoid the direct contact between the heating plate and the battery cell, so as to prevent the local overheating of the battery cell, and the gradually heated cooling liquid can also heat the battery cell uniformly.

[0016] Further, in the vehicle of the application, the battery cell, the liquid cooling plate and the heating plate are electrically connected with the battery management system respectively, so that the temperature conditions of the liquid cooling plate and the heating plate can be detected in real time, so as to control the power of the heating plate, and the battery cell can always be maintained at a suitable working temperature. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a structural schematic view of the battery pack of the application;

[0018] Figure 2is an exploded view of the battery pack of the embodiment of the present application;

[0019] Figure 3 is a top view of the battery pack of the embodiment of the present application;

[0020] Figure 4 is a structure diagram of the battery pack of the embodiment of the present application Figure 3 is a sectional view in the A-A direction;

[0021] Figure 5 is a structure diagram of the battery pack of the embodiment of the present application Figure 4 is an enlarged view of C of the battery pack of the embodiment of the present application;

[0022] Figure 6 is a structure diagram of the battery pack of the embodiment of the present application Figure 3 is a sectional view in the B-B direction;

[0023] Figure 7 is a structure diagram of the battery pack of the embodiment of the present application Figure 6 is an enlarged view of D of the battery pack of the embodiment of the present application;

[0024] Figure 8 is a structure diagram of the frame of the embodiment of the present application;

[0025] Figure 9 is a structure diagram of the bottom shield of the embodiment of the present application;

[0026] Figure 10 is a structure diagram of the liquid cooling plate of the embodiment of the present application.

[0027] In the drawings, 1, battery pack; 11, battery cell; 12, liquid cooling plate; 121, liquid cooling part; 122, mounting part; 13, heating plate; 131, heat-conducting layer; 132, encapsulating layer; 14, box body; 141, top cover; 142, frame; 1421, first extension part; 14211, first mounting hole; 143, bottom shield; 1431, accommodating groove; 1432, second extension part; 14321, second mounting hole; 144, mounting piece; 15, heat insulation plate. DETAILED DESCRIPTION

[0028] The specific embodiments of the present application will be further described in conjunction with the drawings and examples. The following examples are used to illustrate the present application, but are not used to limit the scope of the present application.

[0029] In the description of the present application, it should be understood that the terms "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0030] In addition, the terms "first", "second", etc. are used only for descriptive purposes and are not to be construed as indicating or implying relative importance or a specific number of the technical features indicated. Therefore, the features defined as "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0031] As shown in Figures 1-5 A battery pack 1 according to an embodiment of the present application includes: a battery cell 11, a liquid cooling plate 12, and a heating plate 13. The liquid cooling plate 12 is arranged below the battery cell 11, and the upper surface of the liquid cooling plate 12 is attached to the lower surface of the battery cell 11. The heating plate 13 is arranged below the liquid cooling plate 12, and the heating plate 13 is attached to the lower surface of the liquid cooling plate 12.

[0032] Based on the above scheme, the battery pack 1 can heat the cooling liquid in the liquid cooling plate 12 through the heating plate 13 when the battery cell 11 needs to be heated, and the liquid cooling plate 12 can also increase the temperature of the cooling liquid itself. The two ways of heating the battery cell 11 together can not only ensure the heating efficiency of the battery cell 11, but also avoid the direct contact between the heating plate 13 and the battery cell 11, which can cause local overheating of the battery cell 11. In addition, the gradually heated cooling liquid can also make the battery cell 11 evenly heated.

[0033] As shown in Figure 5 In order to ensure the safety of the battery pack 1, the heating plate 13 includes a heat-conducting layer 131 and an encapsulating layer 132. The heat-conducting layer 131 is arranged inside the encapsulating layer 132, and the encapsulating layer 132 is attached to the lower surface of the liquid cooling plate 12. The encapsulating layer 132 prevents the heat-conducting layer 131 from directly contacting other structures.

[0034] In some embodiments, the heat-conducting layer 131 is made of a conductive material, such as a metal material. The encapsulating layer 132 is made of an insulating material, and can be attached to the outer surface of the heat-conducting layer 131 in the form of a thin film or a thin material, or can be arranged on the outer surface of the heat-conducting layer 131 in the form of a spray.

[0035] Optionally, in order to ensure the insulation and protect the heat-conducting layer 131, the thickness of the encapsulating layer 132 is M, and 0.01mm≤M≤30mm. Preferably, M is 1mm-10mm.

[0036] Optionally, in order to ensure the heating efficiency of the heating plate 13, the thermal conductivity of the heat-conducting layer 131 is N, and N<10W / m·k. Preferably, N is 3W / m·k-7W / m·k.

[0037] As shown in Figure 1 and Figure 2As shown, in order to protect the battery cell 11, the liquid cooling plate 12 and the heating plate 13, the battery pack 1 further comprises a box 14, and the battery cell 11, the liquid cooling plate 12 and the heating plate 13 are all arranged in the box 14.

[0038] As shown in Figure 2 and Figure 5 As shown, since the battery pack 1 is generally connected with the vehicle body through the bottom of the box 14, in order to maintain the temperature of the battery cell 11 and avoid the heat of the heating plate 13, the liquid cooling plate 12 and the battery cell 11 from dissipating through the bottom of the box 14, the battery pack 1 further comprises a heat insulation plate 15 arranged between the heating plate 13 and the bottom of the box 14, so as to avoid the heat of the heating plate 13, the liquid cooling plate 12 and the battery cell 11 from dissipating through the bottom of the box 14.

[0039] As shown in Figure 2 and Figure 5 As shown, in order to facilitate the assembly of the battery pack 1, the box 14 comprises a top cover 141, a frame 142 and a bottom guard plate 143, the top and bottom of the frame 142 are both provided with openings, the top cover 141 is connected to the top opening of the frame 142, and the bottom guard plate 143 is connected to the bottom opening of the frame 142; the battery cell 11 is located in the interior of the frame 142; the bottom guard plate 143 is provided with a receiving groove 1431 on one side surface thereof facing the frame 142, and the liquid cooling plate 12 and the heating plate 13 are both located in the receiving groove 1431; during the assembly of the battery pack 1, the battery cell 11 can be first placed in the frame 142, then the liquid cooling plate 12 and the heating plate 13 are sequentially installed, and finally the bottom guard plate 143 is installed on the frame 142, so that the liquid cooling plate 12 and the heating plate 13 are located in the receiving groove 1431, thereby completing the assembly of the battery pack 1, and the whole assembly process is very simple.

[0040] In some embodiments, the heating plate 13 can be clamped between the liquid cooling plate 12 and the heat insulation plate 15, or be fixed in the receiving groove 1431 of the bottom guard plate 143 by means of bonding and riveting.

[0041] As shown in Figures 6-9As shown, in order to ensure the connection strength of the frame 142 and the bottom guard plate 143, the box body 14 further comprises a mounting piece 144, the bottom edge of the frame 142 has a first extension part 1421 extending horizontally and outwardly, the top edge of the bottom guard plate 143 has a second extension part 1432 extending horizontally and outwardly, the first extension part 1421 and the second extension part 1432 are oppositely arranged, and the first extension part 1421 is provided with a first mounting hole 14211, and the second extension part 1432 is provided with a second mounting hole 14321 oppositely arranged with the first mounting hole 14211, and the mounting piece 144 passes through the second mounting hole 14321 and the first mounting hole 14211 in sequence to fix the bottom guard plate 143 on the frame 142, and the first extension part 1421 of the frame 142 and the second extension part 1432 of the bottom guard plate 143 are connected through the first mounting piece 144, which can not only ensure the connection strength of the frame 142 and the bottom guard plate 143, but also avoid occupying the space in the accommodating groove 1431 and affecting the installation of the liquid cooling plate 12 and the heating plate 13.

[0042] As shown in the Figure 10 In order to facilitate the installation of the liquid cooling plate 12, the liquid cooling plate 12 comprises a liquid cooling part 121 and a mounting part 122, the mounting part 122 is arranged on the outer peripheral side of the liquid cooling part 121, the upper surface of the liquid cooling part 121 is attached to the electric core 11, and the mounting part 122 is fixed to the lower surface of the frame 142. When assembling the liquid cooling plate 12, the liquid cooling plate 12 can be first installed on the lower surface of the frame 142, and then the electric core 11 is installed in the inside of the frame 142, so that the lower surface of the electric core 11 is attached to the upper surface of the liquid cooling plate 12. This arrangement can not only facilitate the installation of the liquid cooling plate 12, but also ensure that the lower surface of the electric core 11 is attached to the upper surface of the liquid cooling plate 12. Preferably, the mounting part 122 is annular structure surrounding the outer peripheral side of the liquid cooling part 121, and the annular mounting part 122 is connected with the frame 142, which can improve the connection strength.

[0043] The vehicle of the embodiment comprises the battery pack 1 and the battery management system (i.e. BMS) as described above, and the electric core 11, the liquid cooling plate 12 and the heating plate 13 are electrically connected with the battery management system.

[0044] Based on the above scheme, the vehicle can detect the temperature change in the battery pack 1 in real time through the battery management system, and can control the power of the heating plate 13 according to the temperature change, so that the electric core 11 can always maintain at a suitable working temperature. In addition, when the vehicle is grounded, the battery management system can timely confirm the grounding loss condition through the insulation resistance of the heating plate 13. For example, if the heating plate 13 functions normally and the insulation resistance of the heating plate 13 is normal, it is judged that the grounding is not serious. If the heating plate 13 functions abnormally and the insulation resistance of the heating plate 13 is abnormal, it is judged that the heating plate 13 has been pierced by foreign matter, and the vehicle grounding is serious.

[0045] In summary, the battery pack 1 and the vehicle provided by the embodiments of the present application can heat the cooling liquid in the liquid cooling plate 12 through the heating plate 13 arranged on the lower surface of the liquid cooling plate 12 of the battery pack 1 when the battery cell 11 needs to be heated, and the liquid cooling plate 12 can also increase the temperature of the cooling liquid itself, so that the battery cell 11 is heated through the two ways, which can not only ensure the heating efficiency of the battery cell 11, but also avoid the direct contact between the heating plate 13 and the battery cell 11, so that the battery cell 11 is locally overheated, and the gradually heated cooling liquid can also heat the battery cell 11 uniformly. In addition, through the battery management system, the temperature of the liquid cooling plate 12 and the heating plate 13 can be detected in real time, so that the power of the heating plate 13 can be controlled, and the battery cell 11 can always be maintained at a suitable working temperature.

[0046] The above is only the preferred embodiment of the present application, and it should be pointed out that for ordinary skilled persons in the technical field, some improvements and replacements can be made without departing from the technical principles of the present application, and these improvements and replacements should also be considered as the protection scope of the present application.

Claims

1. A battery pack, characterized by, The battery pack comprises: an electric core; a liquid cooling plate arranged below the electric core and having an upper surface adhered to a lower surface of the electric core; and a heating plate arranged below the liquid cooling plate and having a lower surface adhered to a lower surface of the liquid cooling plate.

2. The battery pack of claim 1, wherein, The heating plate comprises a heat-conducting layer arranged inside an encapsulating layer, and the encapsulating layer is adhered to the lower surface of the liquid cooling plate.

3. The battery pack of claim 2, wherein, The encapsulating layer has a thickness M, and 0.01mm≤M≤30mm.

4. The battery pack of claim 2, wherein, The heat-conducting layer has a heat-conducting coefficient N, and N<10W / m·k.

5. The battery pack of any one of claims 1-4, wherein, The battery pack further comprises a box, and the electric core, the liquid cooling plate and the heating plate are arranged in the box.

6. The battery pack of claim 5, wherein, The battery pack further comprises a heat-insulating plate arranged between the heating plate and a bottom of the box.

7. The battery pack of claim 5, wherein, The box comprises a top cover, a frame and a bottom plate, the top and bottom of the frame are both open, the top cover is connected to the top opening of the frame, and the bottom plate is connected to the bottom opening of the frame. The electric core is arranged inside the frame. The bottom plate has a receiving groove on a side surface facing the frame, and the liquid cooling plate and the heating plate are arranged in the receiving groove.

8. The battery pack of claim 7, wherein, The box further comprises a mounting member, the bottom edge of the frame has a first extension extending horizontally and outwardly, the top edge of the bottom plate has a second extension extending horizontally and outwardly, the first extension and the second extension are arranged oppositely, the first extension is provided with a first mounting hole, the second extension is provided with a second mounting hole arranged oppositely to the first mounting hole, and the mounting member passes through the second mounting hole and the first mounting hole in sequence to fix the bottom plate to the frame.

9. The battery pack of claim 7, wherein, The liquid cooling plate comprises a liquid cooling portion and a mounting portion, the mounting portion is arranged on a peripheral side of the liquid cooling portion, an upper surface of the liquid cooling portion is adhered to the electric core, and the mounting portion is fixed to a lower surface of the frame.

10. A vehicle characterized by comprising: The battery pack further comprises a battery management system, and the electric core, the liquid cooling plate and the heating plate are electrically connected to the battery management system.

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