Lithium battery module for industrial vehicle

Abstract

The utility model relates to the field of lithium battery module, concretely is a kind of lithium battery module for industrial vehicle, including battery pack, battery pack is made of several electric core, and two end plates are symmetrically fixedly installed in electric core group both sides, further include: heat dissipation part, heat dissipation part is fixedly installed in the lower surface of battery pack, and heat dissipation part at least includes heat-conducting silica gel cover.The utility model in, through No.1 aluminium row and No.2 aluminium row are connected in series-parallel connection to electric core, No.1 aluminium row is responsible for main current transmission, and wiring harness integrated voltage sampling line, temperature sensor line and fan power supply line, and battery management system is gathered the temperature and voltage of electric core by wiring harness, when temperature reaches 40 degrees Celsius, battery management system will start heat dissipation fan by wiring harness control, to reach the purpose of cooling, and heat dissipation part is integrated in battery module bottom as a whole, and heat dissipation fan is automatically started and stopped according to temperature signal, realizes intelligent temperature control, and battery management system is gathered the temperature and voltage of electric core by wiring harness.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery modules, and in particular to a lithium battery module for industrial vehicles. Background Technology

[0002] Due to the increasing demand for energy conservation and environmental protection, the proportion of electric industrial vehicles is gradually surpassing that of diesel vehicles. However, lithium batteries used in industrial vehicles face the requirement of high-power discharge, and currently, battery packs can only meet these requirements through natural cooling. This significantly reduces the frequency of battery use and battery life. A lithium battery module is a standardized, manageable, and scalable energy storage unit formed by combining multiple individual battery cells in series, parallel, or mixed connections, and integrating structural components, thermal management systems, electrical connectors, battery management system data acquisition harnesses, and other components. Excessive lithium battery temperature affects performance and safety. If the cell temperature exceeds the critical point, it may trigger a chain reaction such as SEI film decomposition, electrolyte combustion, and positive and negative electrode reactions, leading to fire and explosion. Effective heat dissipation can prevent this process. During charging and discharging, the internal electrochemical reactions of lithium batteries generate heat, especially during high-current charging and discharging. Ohmic losses and polarization reactions significantly increase heat generation. In high-temperature environments, the heat around the battery module cannot dissipate in time, further exacerbating the temperature rise. Lithium batteries are highly sensitive to temperature. Excessive temperature can lead to electrolyte decomposition, separator melting, and intensified reactions in the positive and negative electrode materials, potentially causing thermal runaway, fire, or even explosion. A good heat dissipation system can control the battery temperature within this range, ensuring efficient and stable operation. High temperatures accelerate battery aging, leading to capacity decay and increased internal resistance. Effective heat dissipation can mitigate electrochemical side reactions and significantly extend battery cycle life. Excessive temperature increases battery internal resistance and reduces energy conversion efficiency. Proper heat dissipation helps maintain a low internal resistance state and improves charge and discharge performance.

[0003] When using lithium battery modules, there is a problem of low heat dissipation efficiency. In view of this, a lithium battery module for industrial vehicles is provided. Utility Model Content

[0004] The main objective of this invention is to provide a lithium battery module for industrial vehicles to solve the problem of low heat dissipation efficiency of lithium battery modules in related technologies.

[0005] To achieve the above objectives, according to one aspect of this utility model, a lithium battery module for industrial vehicles is provided, including a battery pack composed of several battery cells. Two end plates are symmetrically fixedly installed on both sides of the battery cell pack. The module also includes a heat dissipation part, which is fixedly installed on the lower surface of the battery pack. The heat dissipation part includes at least a thermally conductive silicone sleeve. The lower end of the battery pack is fixedly installed inside the battery pack. A heat sink is fixedly installed on the lower surface of the thermally conductive silicone sleeve. A cooling fan is fixedly installed on one side of the heat sink. The heat generated inside the battery pack is transferred to the heat sink through the thermally conductive silicone sleeve, and the cooling fan dissipates heat from the heat sink.

[0006] Furthermore, several aluminum busbars are fixedly installed on the upper surface of the battery pack, and the aluminum busbars are connected to the electrodes of the battery cells.

[0007] Furthermore, a second aluminum busbar is fixedly installed at the edge of the upper surface of the battery cell, and one end of the second aluminum busbar is fixedly installed on the end plate.

[0008] Furthermore, a second aluminum busbar is fixedly installed at the edge of the upper surface of the battery cell, and one end of the second aluminum busbar is fixedly installed on the end plate.

[0009] Furthermore, two packing straps are fixedly installed on the outside of the battery pack to secure the battery cells and end plates.

[0010] Furthermore, a wire harness is fixedly installed on the upper surface of the battery pack, with one end of the wire harness connected to aluminum busbar number one and aluminum busbar number two, and the other end of the wire harness fixedly installed inside the cooling fan.

[0011] Furthermore, the upper surface of the thermally conductive silicone sleeve is provided with an installation groove, the lower end of the battery pack is fixedly installed in the installation groove, a thermally conductive pad is fixedly installed at the bottom of the installation groove, and a number of heat dissipation grooves are provided on the outer wall of the thermally conductive silicone sleeve, the first heat dissipation groove having a concave arc structure.

[0012] Furthermore, the heat sink is made of metal.

[0013] Furthermore, the outer wall of the radiator is provided with several second-order heat dissipation grooves, and several heat dissipation fins are fixedly installed on the lower surface of the radiator.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] In this invention, the battery cells are connected in series and parallel via aluminum busbars No. 1 and No. 2. Aluminum busbar No. 1 is responsible for the main current transmission, while aluminum busbar No. 2 connects to the end plate, which not only enhances the continuity of the structure's conductivity but also serves as a voltage sampling point. Packing straps are used to secure the battery cells and end plates. The packing straps surround the battery pack, providing uniform circumferential preload. The packing straps and end plates form a double constraint system of axial and circumferential forces. The end plates are resistant to compression, while the packing straps are resistant to shearing and lateral loosening. The nylon straps have a certain degree of elasticity and can absorb vibration energy. A wiring harness is fixedly installed on the upper surface of the battery pack. This harness integrates voltage sampling lines, temperature sensor lines, and fan power supply lines. The battery management system (BMS) collects the temperature and voltage of the battery cells through this harness. When the temperature reaches 40 degrees Celsius, the BMS controls the cooling fan to start via the harness, thus achieving cooling. The heat dissipation unit is integrated into the bottom of the battery module. The cooling fan automatically starts and stops based on the temperature signal, achieving intelligent temperature control. The upper surface of the thermally conductive silicone sleeve has a mounting groove. The lower end of the battery pack is fixedly installed in the mounting groove, and a thermal pad is fixedly installed at the bottom of the groove. Several No. 1 heat dissipation grooves are formed on the outer wall of the thermally conductive silicone sleeve. These grooves have a concave arc structure. During installation, the bottom of the battery pack is precisely embedded into the mounting groove of the thermally conductive silicone sleeve. The No. 1 heat dissipation grooves are exposed to the external environment, enhancing natural convection and radiation heat dissipation. Filling the micro-uneven surfaces significantly reduces contact thermal resistance and improves thermal conductivity. The No. 1 heat dissipation groove increases the heat dissipation area of ​​the outer surface of the silicone sleeve. The concave arc structure helps guide airflow, forming micro-turbulence and improving natural convection. It also has a certain stress release function to adapt to thermal expansion and contraction. The thermally conductive silicone sleeve fits tightly against the bottom of the battery pack, absorbing and conducting heat. The heat sink diffuses heat laterally, increasing the effective heat dissipation area. The cooling fan forces airflow over the heat dissipation fins, enhancing convective heat transfer efficiency. The No. 2 heat dissipation groove increases the lateral heat dissipation area and forms a synergistic heat dissipation structure with the No. 1 heat dissipation groove, increasing the contact area between the heat sink and the air, guiding the cooling airflow along the side, and improving edge heat dissipation efficiency. The heat dissipation fins constitute the core area of ​​active and passive heat dissipation. After the cooling fan starts, the airflow passes through the gaps between the fins, greatly enhancing forced convection heat transfer. The heat dissipation fins are arranged vertically to form an airflow channel for the cooling fan to blow. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the lithium battery module in a preferred embodiment of the present invention;

[0017] Figure 2 This is a schematic diagram of the battery pack structure in a preferred embodiment of the present invention;

[0018] Figure 3 This is a schematic diagram of the heat dissipation section structure in a preferred embodiment of the present invention;

[0019] Figure 4This is a schematic diagram of the radiator structure in a preferred embodiment of the present invention;

[0020] Figure 5 This is a schematic diagram of the thermally conductive silicone pad structure in a preferred embodiment of the present invention.

[0021] Figure label:

[0022] 1. Battery pack; 11. Battery cell; 12. End plate; 13. Wiring harness; 111. Aluminum busbar No. 1; 112. Aluminum busbar No. 2; 113. Packing straps;

[0023] 2. Heat dissipation section; 21. Thermal conductive silicone sleeve; 22. Heat sink; 23. Cooling fan; 211. Mounting slot; 212. Thermal pad; 213. No. 1 heat dissipation groove; 221. Heat dissipation fins; 222. No. 2 heat dissipation groove. Detailed Implementation

[0024] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0025] This embodiment provides a lithium battery module for industrial vehicles, including a battery pack 1. The battery pack 1 is composed of a plurality of battery cells 11, and two end plates 12 are symmetrically fixedly installed on both sides of the battery cell group 11. Figure 1 , Figure 2As shown, several aluminum busbars 111 are fixedly mounted on the upper surface of the battery pack 1, and the aluminum busbars 111 connect to the electrodes of the battery cell 11. Aluminum busbars 112 are fixedly mounted at the edge of the upper surface of the battery cell 11, with one end of each aluminum busbar 112 fixedly mounted on the end plate 12. The battery cell 11 is connected in series and parallel via the aluminum busbars 111 and 112. The aluminum busbars 111 are responsible for the main current transmission, and the aluminum busbars 112 connect to the end plate 12, which enhances the structural conductivity continuity and also serves as a voltage sampling point. To prevent the battery pack 1 from... During use, the battery pack 1 may loosen due to vibration. Two cable ties 113 are fixedly installed on the outside of the battery pack 1. The cable ties 113 are used to secure the battery cell 11 and the end plate 12. The cable ties 113 surround the battery pack 1. In this utility model, the cable ties 113 are preferably made of high-strength nylon material, which provides uniform circumferential pre-tightening force. The cable ties 113 and the end plate 12 form an axial and circumferential double constraint system. The end plate 12 is resistant to compression, and the cable ties 113 is resistant to shearing and lateral loosening. The nylon cable ties have a certain degree of elasticity and can absorb vibration energy. A wiring harness 13 is fixedly installed on the upper surface of the battery pack 1. One end of the wiring harness 13 is connected to the first aluminum busbar 111 and the second aluminum busbar 112, and the other end of the wiring harness 13 is fixedly installed inside the cooling fan 23. The wiring harness 13 integrates a voltage sampling line, a temperature sensor line, and a fan power supply line. The battery management system collects the temperature and voltage of the battery cell 11 through the wiring harness 13. When the temperature reaches 40 degrees Celsius, the battery management system will control the cooling fan 23 to start through the wiring harness 13, thereby achieving the purpose of cooling.

[0026] It also includes: a heat dissipation unit 2, which is fixedly installed on the lower surface of the battery pack 1. The heat dissipation unit 2 includes at least a thermally conductive silicone sleeve 21. The lower end of the battery pack 1 is fixedly installed inside the battery pack 1, and a heat sink 22 is fixedly installed on the lower surface of the thermally conductive silicone sleeve 21. Traditional battery pack 1 has low passive heat dissipation efficiency, which is difficult to meet the temperature control requirements under high power scenarios. An active and passive composite heat dissipation mechanism is required to achieve rapid and stable cooling. The heat dissipation unit 2 is integrated into the bottom of the battery module. The cooling fan 23 automatically starts and stops according to the temperature signal to achieve intelligent temperature control. The battery management system collects the temperature and voltage of the cell 11 through the wiring harness 13. Figure 3 , Figure 5As shown, the upper surface of the thermally conductive silicone sleeve 21 has an installation groove 211. The lower end of the battery pack 1 is fixedly installed in the installation groove 211. A thermally conductive pad 212 is fixedly installed at the bottom of the installation groove 211. Several heat dissipation grooves 213 are formed on the outer wall of the thermally conductive silicone sleeve 21. The heat dissipation grooves 213 have a concave arc structure. During installation, the bottom of the battery pack 1 is precisely embedded into the installation groove 211 of the thermally conductive silicone sleeve 21. The heat dissipation grooves 213 are exposed to the external environment, which enhances natural convection and radiation heat dissipation. The thermally conductive pad 212 fills the micro-uneven surface, which significantly reduces the contact thermal resistance and improves the thermal conductivity. The heat dissipation grooves 213 increase the heat dissipation area of ​​the outer surface of the silicone sleeve. The concave arc structure is conducive to guiding airflow, forming micro-turbulence, improving the natural convection effect, and also has a certain stress release function to adapt to thermal expansion and contraction.

[0027] A cooling fan 23 is fixedly installed on one side of the heat sink 22. Heat generated inside the battery pack 1 is transferred to the heat sink 22 via a thermally conductive silicone sleeve 21. The cooling fan 23 dissipates heat from the heat sink 22. When the temperature reaches 40 degrees Celsius, the battery management system controls the cooling fan 23 to start via wiring harness 13, thereby achieving cooling. The thermally conductive silicone sleeve 21 is tightly fitted to the bottom of the battery pack 1, absorbing and conducting heat. The heat sink 22 diffuses heat laterally, increasing the effective heat dissipation area. The cooling fan 23 forces airflow over the heat dissipation fins 221, enhancing convective heat transfer efficiency. Figure 4 As shown, the radiator 22 is made of metal. In this application, the radiator 22 is preferably made of aluminum alloy, which has high thermal conductivity and can achieve rapid lateral heat conduction. Several second heat dissipation grooves 222 are opened on the outer wall of the radiator 22. Several heat dissipation fins 221 are fixedly installed on the lower surface of the radiator 22. The second heat dissipation grooves 222 increase the lateral heat dissipation area and form a synergistic heat dissipation structure with the first heat dissipation groove 213, increasing the contact area between the radiator 22 and the air, guiding the cooling air to flow along the side, and improving the edge heat dissipation efficiency. The heat dissipation fins 221 constitute the core area of ​​active and passive heat dissipation. After the cooling fan 23 is started, the airflow passes through the gaps between the fins, which greatly enhances the forced convection heat transfer. The heat dissipation fins 221 are arranged vertically to form an air duct for the cooling fan 23 to blow.

[0028] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A lithium battery module for industrial vehicles, comprising a battery pack (1), the battery pack (1) being composed of a plurality of battery cells (11), and two end plates (12) symmetrically fixedly mounted on both sides of the battery cell (11) group, characterized in that, Also includes: Heat dissipation part (2) is fixedly installed on the lower surface of battery pack (1). Heat dissipation part (2) includes at least a thermally conductive silicone sleeve (21). The lower end of battery pack (1) is fixedly installed inside battery pack (1). A heat sink (22) is fixedly installed on the lower surface of thermally conductive silicone sleeve (21). A cooling fan (23) is fixedly installed on one side of the heat sink (22). The heat generated inside battery pack (1) is transferred to the heat sink (22) through thermally conductive silicone sleeve (21). The cooling fan (23) dissipates heat from the heat sink (22).

2. The lithium battery module for industrial vehicles according to claim 1, characterized in that, The battery pack (1) has several aluminum busbars (111) fixedly installed on its upper surface. The aluminum busbars (111) are connected to the electrodes of the battery cell (11).

3. The lithium battery module for industrial vehicles according to claim 1, characterized in that, A second aluminum busbar (112) is fixedly installed at the edge of the upper surface of the battery cell (11), and one end of the second aluminum busbar (112) is fixedly installed on the end plate (12).

4. The lithium battery module for industrial vehicles according to claim 1, characterized in that, Two packing straps (113) are fixedly installed on the outside of the battery pack (1), and the packing straps (113) are used to bundle and fix the battery cell (11) and the end plate (12).

5. The lithium battery module for industrial vehicles according to claim 1, characterized in that, A wire harness (13) is fixedly installed on the upper surface of the battery pack (1). One end of the wire harness (13) is connected to the first aluminum busbar (111) and the second aluminum busbar (112), and the other end of the wire harness (13) is fixedly installed inside the cooling fan (23).

6. The lithium battery module for industrial vehicles according to claim 1, characterized in that, The upper surface of the thermally conductive silicone sleeve (21) is provided with an installation groove (211). The lower end of the battery pack (1) is fixedly installed in the installation groove (211). A thermally conductive pad (212) is fixedly installed at the bottom of the installation groove (211). Several heat dissipation grooves (213) are provided on the outer wall of the thermally conductive silicone sleeve (21). The heat dissipation grooves (213) are concave arc-shaped structures.

7. The lithium battery module for industrial vehicles according to claim 1, characterized in that, The radiator (22) is made of metal.

8. The lithium battery module for industrial vehicles according to claim 1, characterized in that, The outer wall of the radiator (22) is provided with several second heat dissipation grooves (222), and several heat dissipation fins (221) are fixedly installed on the lower surface of the radiator (22).

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