A lithium battery heating device

Abstract

This utility model claims protection for a lithium battery heating device, which is disposed within a housing containing several parallel battery cells. The heating film is a sheet-like, vertically positioned piece that is curved within the housing to accommodate the battery cells. Both ends of the heating film are electrically connected to a circuit board within the housing. The circuit board is electrically connected to the electrodes of the battery cells via several conductive busbars. The circuit board provides electrical energy to the heating film, thereby heating the battery cells. This utility model uses the heating film wound around the battery cells as a heat source, combined with a heat transfer method dominated by thermal radiation, to achieve uniform heating of the battery cells. It generates heat on the surface of the battery cells, resulting in uniform heating of the entire battery pack and effectively improving battery performance and lifespan in cold environments.

Description

Technical Field

[0001] This utility model relates to a battery device, and more specifically, to a lithium battery heating device. Background Technology

[0002] Lithium-ion batteries are common power supply components in the two-wheeled vehicle industry. Compared to battery packs in electric vehicles, battery packs in two-wheeled vehicles lack a complete thermal management system. Due to cost limitations, they lack active heating devices, leading to the safety risk of lithium plating during low-temperature charging. The battery management system can control the charging and discharging circuit to apply a high-frequency alternating current to the battery, utilizing the internal resistance of the cells to achieve self-heating. Although this method is highly efficient and provides uniform heating, technical difficulties and cost issues prevent its widespread adoption in the two-wheeled vehicle industry. In existing technologies, an additional heating box is installed around the battery pack to raise the temperature. However, in actual use, it has been found that the outer cells can heat up quickly, while the inner cells heat up slowly or not at all, still posing a safety risk of lithium plating. Therefore, a lithium battery heating device is needed that can generate heat on the surface of the cells, thereby ensuring uniform heating of the entire battery pack.

[0003] For the reasons mentioned above, how to generate heat on the surface of the battery cell is the problem that this application addresses. Utility Model Content

[0004] To address the shortcomings of existing technologies, a lithium battery heating device is provided, which can generate heat on the surface of the battery cell, thereby ensuring uniform heating of the entire battery pack.

[0005] To achieve the above objectives, the following technical solution is provided: a lithium battery heating device, disposed within a housing, wherein a plurality of parallel battery cells are installed within the housing, including a heating film, the heating film being a sheet-like body, vertically arranged, the heating film being curved within the housing to adapt to the position of the battery cells, the two ends of the heating film being electrically connected to a circuit board within the housing, the circuit board being electrically connected to the electrodes of the battery cells through a plurality of conductive busbars; the circuit board is used to provide electrical energy to the heating film, thereby realizing the heating film heating the battery cells.

[0006] Furthermore, the width of the heating film corresponds to the height of the battery cell.

[0007] Furthermore, the battery cells are arranged in rows, and the heating film extends into the gap between two adjacent rows of battery cells, with the heating film in contact with the outer peripheral surface of the battery cells.

[0008] Furthermore, the circuit board is a BMS protection board.

[0009] Furthermore, the heating film is a PI heating film.

[0010] Furthermore, a number of foams are provided on the outer surface of the heating film, which are positioned corresponding to the inner side of the housing, and the outer surface of the foams is used to abut against the inner side of the housing.

[0011] Furthermore, the foam is in strip shape, extending along the length of the heating film, and there are multiple foam strips, which are spaced apart along the width of the heating film.

[0012] Furthermore, an installation area is formed inside the casing, where all the battery cells are installed, and the circuit board is vertically installed on the outside of the installation area.

[0013] In summary, the above technical solution has the following beneficial effects: This utility model uses a heating film wrapped around the battery cell as a heat source, combined with a heat transfer method dominated by thermal radiation to achieve uniform heating of the battery cell. It can generate heat on the surface of the battery cell, thereby making the battery pack as a whole uniformly heated, effectively improving the battery's performance and lifespan in cold environments. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of a lithium battery heating device.

[0015] Figure 2 This is a three-dimensional structural diagram of the heating film in this utility model.

[0016] Reference numerals: 1. Battery cell; 2. Heating film; 3. Connecting wire; 4. Circuit board; 5. Foam; 6. Installation area. Detailed Implementation

[0017] Reference Figure 1-2 As shown, a lithium battery heating device is disposed within a housing, in which several parallel battery cells 1 are installed. The device includes a heating film 2, which is a sheet-like material and is vertically arranged. The heating film 2 is curved within the housing to adapt to the position of the battery cells. The two ends of the heating film 2 are electrically connected to a circuit board 4 within the housing. The circuit board 4 is electrically connected to the electrodes of the battery cells 1 through several conductive bars. The circuit board 4 is used to provide electrical energy to the heating film 2, thereby enabling the heating film 2 to heat the battery cells 1.

[0018] The core principle of this utility model is to use the heating film 2 as a heat source and transfer heat evenly and controllably to multiple cylindrical lithium battery cells 1 through thermal radiation, so that they can quickly and safely heat up to the optimal operating temperature range in low-temperature environments. This invention uses a heating film 2 wrapped around the battery cell 1 as a heat source. Through a curved arrangement and a heat transfer method dominated by thermal radiation, the battery cell 1 is heated evenly. Heat is generated on the surface of the battery cell 1, so that the battery pack is heated evenly as a whole, which effectively improves the performance and life of the battery in cold environments.

[0019] The heating film 2 is wound between multiple battery cells 1. The battery cells 1 provide power to the heating film 2 through the large conductive busbar on the circuit board 4. The sheet-like heating film 2 is wound and shuttled between the battery cells 1 by utilizing the gaps created after the cylindrical battery cells 1 are arranged. At the same time, the width of the heating film 2 corresponds to the height of the battery cells 1. In this way, the heating film 2 can be as close as possible to the surface of each battery cell 1, thereby shortening the distance between the heat source and the battery cell 1, reducing the heat loss in the air, and making the heat energy utilization rate higher.

[0020] The battery will undergo volume changes due to thermal expansion and contraction. The heating film 2 is a PI heating film 2. Polyimide (PI) material has excellent flexibility, high temperature resistance and insulation. The installation method of fixing the ends and suspending the middle allows the heating film 2 to have a certain degree of freedom and elasticity, avoiding damage due to stress tension. In addition, after being powered on, the heating film 2 emits heat in the form of a ring around the battery cell 1. Its heat is dissipated in the form of infrared radiation to the surroundings, thereby achieving the purpose of uniform heating.

[0021] Several foams 5 are provided on the outer surface of the heating film 2. These foams 5 are positioned corresponding to the inner side of the housing. The outer surface of the foams 5 is used to abut against the inner side of the housing. The foams 5 are strip-shaped and extend along the length of the heating film 2. There are multiple foams 5, which are spaced apart in the width direction of the heating film. By setting multiple foams 5, the heating film 2 can be divided into multiple independent heating circuits. The temperature of these zones can be controlled or collected separately. For example, the area with a lower temperature can be heated more intensely, further optimizing the temperature uniformity of the entire battery pack. In addition, the foams 5 can also act as a pad to protect the heating film 2.

[0022] The heating film 2 is electrically connected to the connecting wire 3, and the connecting wire 3 is electrically connected to the BMS protection board 4. The heating film 2 is connected to the battery management system (BMS) through the connecting wire 3. The BMS monitors the temperature of the battery pack in real time, thereby realizing intelligent control to turn the heating circuit on or off to ensure safety. Moreover, the required power comes directly from the charging end or external power source, rather than consuming the battery's own power. In order to facilitate the installation of components, an installation area 6 is formed inside the housing. All the battery cells 1 are set in the installation area 6, and the circuit board 4 is set vertically on the outside of the installation area.

Claims

1. A lithium battery heating device, which is arranged in a shell, and a plurality of parallel arranged battery cells are installed in the shell, characterized in that, It includes a heating film, which is a sheet-like body and is vertically arranged. The heating film is curved inside the housing to adapt to the position of the battery cell. The two ends of the heating film are electrically connected to the circuit board inside the housing. The circuit board is electrically connected to the electrodes of the battery cell through several conductive bars. The circuit board is used to provide power to the heating film, so as to realize the heating film heating the battery cell.

2. The lithium battery heating device of claim 1, wherein, The width of the heating film corresponds to the height of the battery cell.

3. The lithium battery heating device of claim 1, wherein, The battery cells are arranged in rows, and the heating film extends into the gap between two adjacent rows of battery cells, with the heating film in contact with the outer peripheral surface of the battery cells.

4. The lithium battery heating device of claim 1, wherein, The circuit board is a BMS protection board.

5. A lithium battery heating device according to any one of claims 1-4, characterized in that, The heating film is a PI heating film.

6. A lithium battery heating device according to any one of claims 1-4, characterized in that, The outer surface of the heating film is provided with a plurality of foams, which are positioned corresponding to the inner side of the shell, and the outer surface of the foams is used to abut against the inner side of the shell.

7. A lithium battery heating device according to claim 6, wherein, The foam is in the form of strips, extending along the length of the heating film. There are multiple strips of foam, which are spaced apart along the width of the heating film.

8. A lithium battery heating device according to any one of claims 1-4, wherein, An installation area is formed inside the housing, and all the battery cells are installed in the installation area. The circuit board is vertically installed on the outside of the installation area.

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