Battery thermal management device

Abstract

The utility model relates to the technical field of battery management, in particular to a battery heat management device which comprises a base and a first low-temperature heating assembly arranged at the upper end of the base, the first low-temperature heating assembly comprises a plurality of battery modules which are sequentially arranged from front to back, and a vapor chamber is arranged between every two adjacent battery modules. First heating pieces are respectively arranged at two ends of the battery module; the battery module comprises a battery core and two first phase change materials arranged on the front side and the rear side of the battery core respectively, and the two ends of the battery core and the two ends of the first phase change materials are connected with the side faces of the two first heating pieces respectively. The battery heat management device is simple in structure, small in occupied area and low in energy consumption, and the first phase change material is used for conducting and absorbing part of heat, so that the temperature of the corresponding battery core is conveniently controlled; the vapor chamber is used for keeping the temperature consistency between the battery modules; the three parts cooperate with each other, so that the battery is in a reasonable temperature range, the performance of the battery is improved, and the service life of the battery is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of battery management, in particular to a battery thermal management device. Background Art

[0002] Both the materials and the operation process of the battery are affected by the low-temperature environment. Under low-temperature environment, the conduction ability of charged ions inside the battery is poor, and the transfer and embedding ability of charges inside the negative electrode material structure is also poor, which is manifested as an increase in the internal resistance of the battery, a decrease in the discharged capacity, and difficulty in charging. When an electric vehicle is used in a low-temperature environment, its performance usually deteriorates greatly, and even the battery may short-circuit and malfunction. Therefore, it is necessary to keep the power vehicle battery at a reasonable temperature, not too low.

[0003] The prior art discloses a battery thermal management device and a battery box with the application number 202023219054.7. Through the cooperative setting of a temperature control board assembly, sponge and heat-conducting oil, the battery thermal management device and the battery box have the effects of simple temperature regulation structure and outstanding effect. A lot of heat-conducting holes are opened inside the temperature control board assembly. Circulating heat-conducting oil in the heat-conducting holes can quickly increase the temperature of the temperature control board assembly, and circulating air cooled by the sponge in the heat-conducting holes can quickly cool down the temperature control board assembly. The temperature control board assembly is directly inserted into the battery box assembly and separates the main power supply batteries layer by layer, which also plays the role of heating or cooling layer by layer. The battery temperature control method of the above device adopts the liquid heating method and the active heat dissipation method through the circulation of coolant, but these methods have problems such as high energy consumption, large volume and low efficiency. Summary of the Invention

[0004] In order to overcome the disadvantages and deficiencies existing in the prior art, the purpose of the utility model is to provide a battery thermal management device, which has a simple structure, is convenient to use, occupies a small area, has low energy consumption, effectively controls the battery temperature, and improves the battery performance and service life.

[0005] In order to solve the above technical problems, the utility model adopts the following technical scheme:

[0006] A battery thermal management device includes a base and a first low-temperature heating component arranged at the upper end of the base. The first low-temperature heating component includes a plurality of battery modules arranged in sequence from front to back. A heat dissipation plate is arranged between two adjacent battery modules. First heating elements are respectively arranged at both ends of the battery module. The battery module includes a battery core and two first phase change materials respectively arranged on the front side and the back side of the battery core. Both ends of the battery core and both ends of the first phase change materials are respectively connected to the side surfaces of the two first heating elements.

[0007] Further, the number of the first low-temperature heating components is multiple, and the multiple first low-temperature heating components are arranged in sequence from top to bottom, and the battery cell at the upper end is connected to the battery cell at the lower end.

[0008] Further, the battery thermal management device further includes a second low-temperature heating component, the second low-temperature heating component includes a second heating element and a second phase change material disposed on the upper end of the second heating element, the upper end surface of the base is connected to the lower end surface of the second heating element, and the lower ends of the multiple battery modules are all connected to the upper end surface of the second phase change material.

[0009] Further, the first heating element is a PTC heating film or a PI heating film.

[0010] Further, the second heating element is a PTC heating film or a PI heating film.

[0011] Further, the heat pipe is a copper heat pipe.

[0012] Further, both the first phase change material and the second phase change material are phase change materials with insulation functions.

[0013] Further, the base is an aluminum base.

[0014] Advantages of the present utility model: The battery thermal management device of the present utility model has a simple structure, is convenient to use, occupies a small area, has low energy consumption, and effectively controls the battery temperature. The first phase change material can undergo a physical phase change when the temperature changes, and has the advantages of large phase change latent heat and small volume change during phase change, so as to conduct and absorb part of the heat, facilitating the control of the temperature of the corresponding battery cell. The heat pipe has the advantages of fast, uniform, and stable heat conduction, and can quickly conduct the heat of the first phase change material on one side of the heat pipe uniformly to the first phase change material on the other side of the heat pipe, maintaining the temperature consistency of two adjacent battery modules. The first heating element is used to heat the battery module at low temperature, providing a low-temperature heating heat source for the battery, and the first heating elements are respectively arranged at both ends of the battery module, improving the heating speed of the battery module. The mutual cooperation of the first phase change material, the heat pipe, and the first heating element has a fast heat conduction speed and a good temperature control effect, enabling the battery to be in a reasonable temperature range, improving the battery performance and service life. Description of the Drawings

[0015] Figure 1 is a three-dimensional structural schematic diagram of the battery thermal management device;

[0016] Figure 2 is a front view of the battery thermal management device;

[0017] Figure 3 is a side view of the battery thermal management device;

[0018] Figure 4 It is a top view of the battery thermal management device;

[0019] Figure 5 It is a three-dimensional structure schematic diagram of the first low-temperature heating component;

[0020] Figure 6 It is a partial exploded structure schematic diagram of the first low-temperature heating component.

[0021] Reference numerals include:

[0022] 1. Battery module; 11. Battery cell; 12. First phase change material; 2. Heat sink; 3. First heating element; 4. Base; 5. Second heating element; 6. Second phase change material. Specific embodiments

[0023] For the convenience of those skilled in the art to understand, the following further describes the present utility model in conjunction with embodiments and drawings. The content mentioned in the embodiments does not limit the present utility model.

[0024] Embodiment 1

[0025] As Figures 1-6 shown, a battery thermal management device includes a base 4 and a first low-temperature heating component disposed at the upper end of the base 4. The first low-temperature heating component includes two first heating elements 3 and a plurality of battery modules 1 arranged in sequence from front to back. A heat sink 2 is disposed between two adjacent battery modules 1. The front side and the rear side of the heat sink 2 are respectively connected to the first phase change material 12 of an adjacent battery module. The two ends of the battery module 1 are respectively provided with a first heating element 3. The battery module 1 includes a battery cell 11 and two first phase change materials 12 respectively disposed on the front side and the rear side of the battery cell 11. The two ends of the battery cell 11 and the two ends of the first phase change material 12 are respectively connected to the sides of the two first heating elements 3.

[0026] The battery thermal management device of the present utility model has a simple structure, is convenient to use, occupies a small area, has low energy consumption, effectively controls the battery temperature, and improves the battery performance and service life. The first phase change material 12 can undergo a physical phase change when the temperature changes, and has the advantages of large latent heat of phase change and small volume change during phase change, so as to conduct and absorb part of the heat, facilitating the control of the temperature of the corresponding battery cell 11. The heat spreader 2 has the advantages of fast, uniform, and stable heat conduction, and can quickly conduct the heat of the first phase change material 12 on one side of the heat spreader 2 evenly to the first phase change material 12 on the other side of the heat spreader 2, maintaining the temperature consistency of two adjacent battery modules 1. The first heating element 3 is used to heat the battery module 1 at low temperature, providing a low-temperature heating heat source for the battery, and the first heating elements 3 are respectively arranged at both ends of the battery module 1, improving the heating speed of the battery module 1. The mutual cooperation of the first phase change material 12, the heat spreader 2, and the first heating element 3 has a fast heat conduction speed and good temperature control effect, enabling the battery to be in a reasonable temperature range and improving the battery performance and service life.

[0027] During use, the heat generated by the first heating element 3 is conducted to the end face of the battery module 1, that is, the heat generated by the first heating element 3 is conducted to the end face of the battery cell 11 and the end face of the first phase change material 12. After the first phase change material 12 absorbs the heat, one side face of the first phase change material 12 conducts the heat to the adjacent heat spreader 2, and the other side face of the first phase change material 12 conducts the heat to the adjacent battery cell 11. During this process, the heat spreader 2 can absorb the heat of the adjacent first phase change material 12 with a higher temperature and release heat to the adjacent first phase change material 12 with a lower temperature. The heat conduction speed is fast, which is beneficial to the temperature consistency of multiple battery cells 11, and multiple batteries are all in a reasonable temperature range, improving the battery performance and service life.

[0028] In this embodiment, the number of the battery modules 1 can be set as required, and the multiple battery cells 11 of the first low-temperature heating assembly are connected in series.

[0029] Further, the battery thermal management device further includes a second low-temperature heating component disposed at the lower end of the first low-temperature heating component. The second low-temperature heating component includes a second heating element 5 and a second phase change material 6 disposed on the upper end of the second heating element 5. The upper end surface of the base 4 is connected to the lower end surface of the second heating element 5, and the lower ends of the plurality of battery modules 1 are all connected to the upper end surface of the second phase change material 6, that is, the lower ends of the plurality of battery cores 11 and the first phase change material 12 are all connected to the upper end surface of the second phase change material 6. The base 4 is used to fix the battery thermal management device. The second heating element 5 is used to heat the plurality of battery modules 1 at low temperature to provide a low-temperature heating heat source for the battery. The second phase change material 6 can undergo a physical phase change when the temperature changes, and has the advantages of large latent heat of phase change and small volume change during phase change, so as to conduct and absorb part of the heat, facilitating the control of the temperature of the entire first low-temperature heating component. During use, the heat generated by the second heating element 5 is conducted to the second phase change material 6. After the second phase change material 6 absorbs the heat, the second phase change material 6 conducts the heat to the plurality of battery modules 1 of the first low-temperature heating component, that is, conducts to the lower ends of the plurality of battery cores 11 and the first phase change material 12. The second phase change material 6 prevents the battery cores 11 from heating up too quickly, facilitating the adjustment of the temperature in each of the battery modules 1 in the first low-temperature heating component, being beneficial to the temperature consistency of the plurality of battery cores 11, and multiple batteries are all within a reasonable temperature range, improving the battery performance and lifespan.

[0030] Further, the first heating element 3 is a PTC heating film or a PI heating film. The PTC heating film has the advantages of fast heating, high safety performance, and power saving. The PI heating film has excellent insulation strength, dielectric strength, heat conduction efficiency, and resistance stability, and can obtain a quite high temperature control accuracy. It has strong practicability. In this embodiment, the first heating element 3 is a PI heating film.

[0031] Further, the second heating element 5 is a PTC heating film or a PI heating film. In this embodiment, the second heating element 5 is a PTC heating film. The structure is simple.

[0032] Further, the heat sink 2 is a copper heat sink to improve the heat dissipation efficiency of the battery thermal management device.

[0033] Further, both the first phase change material 12 and the second phase change material 6 are phase change materials with insulation functions, avoiding electrical short circuits formed between the battery cores 11 through contact with the phase change material, and having strong practicability. In this embodiment, both the first phase change material 12 and the second phase change material 6 adopt phase change materials with insulation functions in the prior art, which is used as an application here.

[0034] Further, the base 4 is an aluminum base. The aluminum is light in weight, reducing the weight of the battery thermal management device and facilitating handling.

[0035] Embodiment 2

[0036] Compared with Embodiment 1, the number of the first low-temperature heating components in this Embodiment 2 is multiple, and the multiple first low-temperature heating components are arranged in sequence from top to bottom. The battery cell 11 at the upper end is connected to the battery cell 11 at the lower end, that is, the battery cell 11 in the first low-temperature heating component at the upper end is connected in parallel with the battery cell 11 in the first low-temperature heating component at the lower end, and two adjacent battery cells 11 in the same first low-temperature heating component are connected in series, which expands the application range of the battery thermal management device.

[0037] In this embodiment, the number of the second low-temperature heating components is one, and the lower end of the first low-temperature heating component at the lowermost end is connected to the upper end surface of the second low-temperature heating component.

[0038] The above content is only a preferred embodiment of the present invention. For those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. The content of this specification should not be construed as a limitation to the present invention.

Claims

1. A battery thermal management device, characterized in that: It includes a second low-temperature heating component, a base (4), and a first low-temperature heating component disposed at the upper end of the base (4). The first low-temperature heating component includes a plurality of battery modules (1) arranged in sequence from front to back. A heat pipe (2) is provided between two adjacent battery modules (1). First heating elements (3) are respectively provided at both ends of the battery module (1). The battery module (1) includes battery cells (11) and two first phase change materials (12) respectively disposed on the front side and the rear side of the battery cells (11). Both ends of the battery cells (11) and both ends of the first phase change materials (12) are respectively connected to the sides of the two first heating elements (3). The second low-temperature heating component includes a second heating element (5) and a second phase change material (6) disposed at the upper end of the second heating element (5). The upper end surface of the base (4) is connected to the lower end surface of the second heating element (5). The lower ends of the plurality of battery modules (1) are all connected to the upper end surface of the second phase change material (6).

2. The battery thermal management device according to claim 1, characterized in that: The number of the first low-temperature heating components is multiple. The multiple first low-temperature heating components are arranged in sequence from top to bottom. The battery cells (11) located at the upper end are connected to the battery cells (11) located at the lower end.

3. The battery thermal management device according to claim 1, characterized in that: The first heating element (3) is a PTC heating film or a PI heating film.

4. The battery thermal management device according to claim 1, wherein: The second heating element (5) is a PTC heating film or a PI heating film.

5. The battery thermal management device according to claim 1, wherein: The heat pipe (2) is a copper heat pipe.

6. The battery thermal management device according to claim 1, wherein: Both the first phase change material (12) and the second phase change material (6) are phase change materials with insulation functions.

7. The battery thermal management device according to claim 1, wherein: The base (4) is an aluminum base.

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