Battery thermal management system based on bidirectional thermal management path and battery pack

Abstract

The utility model relates to a kind of battery thermal management system and battery pack based on two-way thermal management path, belong to the technical field of battery.It is set up heat insulation layer and heating film in the bottom of vertical direction, upper part is set up heat conduction layer and radiating backplate, heat insulation layer is formed one-way thermal barrier, heat of heating film is guided to be transmitted efficiently upward to heat battery at low temperature, battery heat is rapidly dissipated upward through heat conduction layer and radiating backplate at high temperature, physically realizes the separation and cooperation of heating and radiating path, effectively solve the problem of mutual interference of thermal management function in traditional scheme, with the advantages of high energy efficiency, reliable structure and low cost.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery thermal management system and battery pack based on a bidirectional thermal management path. Background Technology

[0002] With the development of battery thermal management technology, a variety of battery thermal management solutions have emerged. These solutions aim to maintain the battery's ideal operating range (usually 15°C to 35°C) by actively controlling the battery temperature in order to cope with the performance degradation and charging difficulties caused by excessively low temperatures, as well as the accelerated aging and thermal runaway risks caused by excessively high temperatures. This has led to the development of related methods or devices such as independent heat dissipation devices and combined heating and heat dissipation devices.

[0003] In related technologies, battery thermal management issues are mainly addressed through independent heat dissipation schemes or simple combinations of heating and heat dissipation. Meanwhile, some technologies simply superimpose heating elements and heat dissipation paths to form a combined thermal management system.

[0004] However, the aforementioned independent heat dissipation methods have the problem of not being able to provide heating function in low-temperature environments, and the heat dissipation system may actually exacerbate the drop in battery temperature during cold starts; while the simple combination method has the problem of mutual interference between different thermal management paths, such as the large amount of heat loss through the heat dissipation path during heating, resulting in low heating efficiency and high energy consumption, and the defect that the heating layer may become a heat insulation layer during heat dissipation, hindering heat transfer. Utility Model Content

[0005] To address the shortcomings of the existing production technologies mentioned above, the applicant provides a battery thermal management system and battery pack based on a bidirectional thermal management path, which can optimize the heat transfer path according to the actual temperature state of the battery, enabling the heating and heat dissipation functions to work together rather than interfere with each other.

[0006] The technical solution adopted in this utility model is as follows: A battery thermal management system based on a bidirectional thermal management path includes, from bottom to top, the following components: Sheet metal chassis serves as the structural foundation and mounting platform; A heat insulation layer is attached to the bottom of the inner sheet metal of the chassis to form a heat insulation layer in the vertical direction; A heating film is attached to the upper surface of the heat insulation layer to generate heat when electricity is applied. The battery module is positioned above the heating film; A thermally conductive layer is attached to the upper surface of the battery module to conduct heat. A heat dissipation backplate is attached to the upper surface of the heat-conducting layer to dissipate heat to the external environment or coolant.

[0007] As a further improvement to the above technical solution: In one embodiment, the projected area of ​​the insulation layer in the vertical direction at least covers the upper surface of the bottom inner bottom of the chassis sheet metal.

[0008] In one embodiment, the thermal conductivity of the insulation layer is lower than that of the thermal conductivity of the thermally conductive layer.

[0009] In one embodiment, the insulation layer is constructed using insulating foam.

[0010] In one embodiment, the thermally conductive layer is structured using a thermally conductive silicone pad, which is elastic and capable of filling gaps.

[0011] In one embodiment, the heat dissipation backplate has a liquid cooling channel inside for heat dissipation through coolant circulation; the heat dissipation backplate has heat dissipation fins on the outside to increase the heat dissipation surface area.

[0012] In one embodiment, the heat dissipation backplate is made of a thermally conductive metal material, such as an aluminum alloy or a copper alloy.

[0013] In one embodiment, the heating film is a PTC heating film.

[0014] On the other hand, this application also provides a battery pack, including the aforementioned battery thermal management system based on a bidirectional thermal management path.

[0015] In one embodiment, the battery pack further includes a control system electrically connected to the heating film, the control system controlling the on / off state of the heating film based on the battery temperature.

[0016] The beneficial effects of this utility model are as follows: This utility model has a compact structure. It sets a heat insulation layer at the bottom of the battery module and a heat conduction layer and a heat dissipation backplate at the top. In low-temperature mode, the heating film is activated, and the heat insulation layer prevents heat from dissipating downward through the chassis sheet metal to the external environment. Instead, the heat is directed to the battery module. In high-temperature mode, the heat is directed to the heat dissipation backplate, which fundamentally solves the problem of mutual interference between heating and heat dissipation in traditional solutions.

[0017] This utility model also has the following advantages: In heating mode, the bottom insulation layer effectively blocks the ineffective downward loss of heat, allowing the heat generated by the heating layer to be concentrated and transferred upward, which greatly improves heating efficiency and reduces energy consumption. In heat dissipation mode, the same insulation layer not only prevents the entry of ambient heat, but also promotes the preferential discharge of battery heat through the high-efficiency heat dissipation path at the top, thereby improving heat dissipation efficiency. Attached Figure Description

[0018] Figure 1 This is an exploded structural diagram of the battery thermal management system of this utility model.

[0019] Figure 2 This is a schematic diagram of the cross-sectional structure of the assembled present invention (arrows indicate the direction of heat flow at low temperatures).

[0020] Figure 3 This is a cross-sectional view of the assembled structure of this utility model (arrows indicate the direction of heat flow at high temperatures).

[0021] The components include: 1. Chassis sheet metal; 2. Heat insulation layer; 3. Heating film; 4. Battery module; 5. Thermal conductive layer; 6. Heat dissipation backplate. Detailed Implementation

[0022] The specific embodiments of this utility model are described below with reference to the accompanying drawings.

[0023] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of this utility model are shown in the drawings. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0025] When using the terms “including,” “having,” and “comprising” as described herein, another component may be added unless explicitly qualifying terms such as “only,” “consisting of,” etc. are used. Unless otherwise stated, singular terms may include plural forms and should not be construed as having a quantity of one.

[0026] It should be understood that although the terms "first," "second," etc., may be used herein to describe various elements, these elements should not be limited by these terms. These terms are used only to distinguish one element from another. For example, without departing from the scope of this invention, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element.

[0027] Furthermore, the accompanying drawings are not drawn to a 1:1 scale, and the relative dimensions of the components are shown in the drawings only as examples and not necessarily to actual scale.

[0028] like Figures 1-3 The accompanying drawing shows a schematic diagram of the structure of a battery thermal management system based on a bidirectional thermal management path according to an embodiment of the present invention; for ease of description, the drawing only shows the structure related to the embodiment of the present invention.

[0029] This application provides a battery thermal management system based on a bidirectional thermal management path, which guides the thermal management path through a layered structure layout.

[0030] In this embodiment, the sheet metal chassis 1 serves as the basic structural component and mounting carrier of the entire system, forming an internal accommodating space. This sheet metal component is typically formed by stamping metal sheets and possesses sufficient structural strength to support the various functional layers above it; Furthermore, a heat insulation layer 2 is laid flat on the inner bottom of the chassis sheet metal 1; The insulation layer 2 is preferably made of heat-insulating foam material and is tightly attached to the upper surface of the chassis sheet metal 1 by means of adhesive bonding or mechanical fixing; The projected area of ​​the insulation layer 2 in the vertical direction should at least completely cover the upper surface of the bottom of the chassis sheet metal 1 to ensure the formation of a complete thermal insulation barrier.

[0031] In this embodiment, a heating film 3 is attached to the upper surface of the heat insulation layer 2; The heating film 3 is preferably a PTC heating film, which can be connected to the upper surface of the heat insulation layer 2 by an adhesive; The size of the heating film 3 matches the bottom area of ​​the battery module 4, ensuring that the heating area can effectively cover the battery module 4 above.

[0032] In this embodiment, the battery module 4 is disposed above the heating film 3, and the bottom surface of the battery module 4 is in close contact with the upper surface of the heating film 3 to ensure heat conduction efficiency.

[0033] In this embodiment, a heat-conducting layer 5 is provided on the upper surface of the battery module 4; The thermal conductive layer 5 preferably uses an elastic thermally conductive silicone pad, which not only has good thermal conductivity, but can also fill the assembly gap between the upper surface of the battery module 4 and the lower surface of the heat dissipation backplate 6 through elastic deformation, thereby eliminating air thermal resistance.

[0034] In this embodiment, the heat dissipation backplate 6 is disposed on the upper surface of the heat conduction layer 5 and is fixedly connected to the chassis sheet metal 1 by bolts, while ensuring that appropriate preload is applied to the heat conduction layer 5 and the battery module 4. The heat dissipation backplate 6 is made of a high thermal conductivity metal material (such as aluminum alloy or copper alloy); In the preferred embodiment, the heat dissipation backplate 6 is provided with a liquid cooling channel inside for active heat dissipation through coolant circulation; at the same time, it is provided with heat dissipation fins on the outside to increase the contact area with the air and enhance the natural convection heat dissipation effect.

[0035] In practical applications, the working process of the thermal management system of this utility model is as follows: When in low-temperature operating conditions (such as...) Figure 2 As shown, when the battery management system detects that the battery temperature is lower than the set threshold, it controls the heating film 3 to be powered on. The heat generated by the heating film 3 is mainly transferred upward to the battery module 4 by the insulation layer 2, effectively preventing heat loss downward through the chassis sheet metal 1; When under high-temperature operating conditions (such as...) Figure 3 As shown in the diagram, when the battery management system detects that the battery temperature is higher than a set threshold, it activates the heat dissipation function of the heat sink backplate 6. The heat generated by the battery module 4 is efficiently conducted upwards through the thermal conductive layer 5 to the heat sink backplate 6, and finally dissipated into the environment through liquid cooling circulation or natural convection.

[0036] In other embodiments, this application provides a battery pack including the battery thermal management system described above.

[0037] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0038] The embodiments described above merely illustrate the implementation of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A battery thermal management system based on a bidirectional thermal management path, characterized in that, Including those set from bottom to top: The chassis sheet metal (1) serves as the structural foundation and mounting carrier; A heat insulation layer (2) is attached to the bottom of the inner side of the chassis sheet metal (1) to form a heat insulation layer in the vertical direction; A heating film (3) is attached to the upper surface of the heat insulation layer (2) and is used to generate heat when electricity is applied; The battery module (4) is disposed above the heating film (3); A heat-conducting layer (5) is attached to the upper surface of the battery module (4) for conducting heat. A heat dissipation backplate (6) is attached to the upper surface of the heat-conducting layer (5) to dissipate heat to the external environment or coolant.

2. The battery thermal management system according to claim 1, characterized in that, The heat insulation layer (2) has a vertical projection area that covers at least the upper surface of the bottom of the inner bottom of the chassis sheet metal (1).

3. The battery thermal management system based on a bidirectional thermal management path according to claim 2, characterized in that, The thermal conductivity of the insulation layer (2) is lower than that of the thermal conductivity of the thermal conductive layer (5).

4. The battery thermal management system according to claim 3, characterized in that, The structure of the insulation layer (2) is made of insulation foam.

5. The battery thermal management system according to claim 3, characterized in that, The structure of the thermal conductive layer (5) adopts a thermally conductive silicone pad, which is elastic.

6. The battery thermal management system based on a bidirectional thermal management path according to claim 1, characterized in that, The heat dissipation backplate (6) has a liquid cooling channel inside for heat dissipation through coolant circulation; the heat dissipation backplate (6) has heat dissipation fins on the outside to increase the heat dissipation surface area.

7. The battery thermal management system based on a bidirectional thermal management path according to claim 6, characterized in that, The heat dissipation backplate (6) is made of a thermally conductive metal material, which is an aluminum alloy or a copper alloy.

8. The battery thermal management system based on a bidirectional thermal management path according to claim 1, characterized in that, The heating film (3) is a PTC heating film.

9. A battery pack, characterized in that, Includes a battery thermal management system based on a bidirectional thermal management path as described in any one of claims 1 to 8.

10. The battery pack according to claim 9, characterized in that, It also includes a control system, which is electrically connected to the heating film (3), and the control system controls the on / off state of the heating film (3) according to the battery temperature.

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