A heat dissipation device for lithium battery

Abstract

This utility model discloses a heat dissipation device for lithium batteries, belonging to the field of lithium battery heat dissipation. It includes a battery box with a sealing cover and a first cooling fan. The first cooling fan is used to dissipate heat from the battery box, and an auxiliary heat dissipation mechanism is used to dissipate heat accumulated in the gaps between the lithium battery modules. The first cooling fan dissipates heat from the top of the battery box as a whole. The second cooling fan of the auxiliary heat dissipation mechanism can be driven by a transmission motor to slide an adjusting plate laterally to the gaps between the lithium battery modules, specifically dissipating accumulated heat. Simultaneously, air guide plates between the battery cells create ventilation channels, forming an orderly airflow path with the help of spacers. Combined with heat-absorbing pads, this quickly absorbs heat from the battery cells and conducts it into the airflow, significantly improving the comprehensiveness and uniformity of heat dissipation, effectively solving the problem of insufficient heat dissipation in large battery packs located far from the fixed fan area.

Description

Technical Field

[0001] This utility model belongs to the field of lithium battery heat dissipation technology, specifically relating to a heat dissipation device for lithium batteries. Background Technology

[0002] Lithium batteries are a type of battery that uses lithium metal or lithium alloy as the positive / negative electrode material and a non-aqueous electrolyte solution. Due to the highly reactive chemical properties of lithium metal, the processing, storage, and use of lithium metal are subject to very high environmental temperature requirements. A lithium battery heat dissipation device is a device specifically designed to control the temperature of lithium batteries during operation. Its core function is to dissipate the heat generated by the lithium battery during charging and discharging in a timely manner through efficient heat dissipation methods, so as to avoid the battery temperature from being too high, which could affect performance, lifespan, or even cause safety risks.

[0003] According to the authorization announcement number CN213124561U, a heat dissipation device for lithium batteries is known to be prior art. Although the patent uses a fan and an air inlet to work together, when the fan is turned on, it can draw air out of the storage compartment and discharge the air inside the storage compartment through the air outlet, while allowing external air to enter the storage compartment through the air inlet, thus circulating the air inside the storage compartment and effectively dissipating heat to protect the lithium battery inside the storage compartment. However, the technical solution of this patent still has the following defects in actual use: the device uses a fan and an air inlet to circulate air, which is a conventional air cooling method. In large battery packs, this method is difficult to ensure that each battery module can be cooled evenly. It is easy for areas near the fan or air duct to have better heat dissipation, while areas far away have insufficient heat dissipation, resulting in large temperature differences within the battery pack, affecting the consistency and overall lifespan of the batteries. Utility Model Content

[0004] The purpose of this invention is to provide a heat dissipation device for lithium batteries to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a heat dissipation device for lithium batteries, comprising a battery box and a lithium battery module, wherein the battery box is provided with a sealing cover plate, and the sealing cover plate is provided with a first cooling fan, the first cooling fan being used to dissipate heat from the battery box; The battery box is also equipped with an auxiliary heat dissipation mechanism, which is used to dissipate the heat accumulated in the gaps between the lithium battery modules. The auxiliary heat dissipation mechanism includes a second cooling fan, an adjustment plate, and a drive motor. The second cooling fan is mounted on the adjustment plate, and the upper end of the adjustment plate is provided with a toothed groove. The output end of the drive motor is provided with drive teeth, which are located above the toothed groove and mesh with each other.

[0006] In a preferred embodiment, the battery box has an assembly cavity, and a connecting door is installed on one side of the assembly cavity. The drive motor and the drive gear are both concealed inside the assembly cavity.

[0007] In a preferred embodiment, a guide cavity is also provided within the assembly cavity, and the adjusting plate is slidably assembled in the guide cavity.

[0008] In a preferred embodiment, a ventilation cavity is provided on the other side of the battery box, the ventilation cavity is arranged opposite to the second cooling fan, and a connecting partition is provided on one side of the ventilation cavity.

[0009] In a preferred embodiment, the lithium battery module is fixed and installed by a fixing frame. Each lithium battery module is composed of multiple sets of battery cells, and a wind guide plate is provided between every two sets of battery cells. The wind guide plate has a ventilation channel, and a set of partition plates is provided in the ventilation channel of the wind guide plate, which divides the ventilation channel into left and right parts.

[0010] In a preferred embodiment, the fixing frame is provided with slots, and each set of air guide plates is embedded in the slots provided on the fixing frame.

[0011] In a preferred embodiment, heat-absorbing pads are provided on both sides of the air guide plate, and the heat-absorbing pads are fitted into the pre-reserved cavities on both sides of the air guide plate.

[0012] Compared with the prior art, the beneficial effects of this utility model are: This lithium battery heat dissipation device uses a first cooling fan to exhaust heat from the top of the battery pack. The second cooling fan of the auxiliary heat dissipation mechanism can be driven by a drive motor to slide the adjustment plate and move laterally to the gaps between each lithium battery module to specifically exhaust the accumulated heat and avoid local overheating. At the same time, the air guide plate between the battery cells opens a ventilation channel, which, together with the spacer plate, forms an orderly airflow path. Combined with the heat-absorbing pads, the heat from the battery cells is quickly absorbed and conducted into the airflow, which greatly improves the comprehensiveness and uniformity of heat dissipation and effectively solves the problem of insufficient heat dissipation in areas far from the fixed fan in large battery packs. The heat dissipation device for lithium batteries has its core components, such as the drive motor and drive gear of the auxiliary heat dissipation mechanism, concealed in the assembly cavity of the battery box. It can be easily maintained through the connecting door. The adjustment plate is slidably assembled in the guide cavity, which not only ensures the stability of the lateral movement of the second cooling fan, but also avoids the components being exposed and occupying extra space. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the internal structure of the battery box of this utility model; Figure 3 This is a schematic diagram of the auxiliary heat dissipation mechanism of the present invention. Figure 4 This is a schematic diagram of the other side of the battery box structure of this utility model.

[0014] Figure 5 This is a schematic diagram of the installation structure of the lithium battery module and the air guide plate of this utility model.

[0015] In the diagram: 1. Battery box; 11. Assembly cavity; 111. Guide cavity; 12. Ventilation cavity; 13. Connecting partition; 2. Sealing cover; 3. First cooling fan; 4. Lithium battery module; 41. Fixing bracket; 411. Slot; 5. Auxiliary heat dissipation mechanism; 51. Second cooling fan; 52. Adjustment plate; 53. Gear groove; 54. Transmission gear; 55. Transmission motor; 6. Air guide plate; 61. Ventilation channel; 62. Spare plate; 63. Heat-absorbing pad. Detailed Implementation

[0016] The present invention will be further described below with reference to the embodiments.

[0017] The following embodiments are used to illustrate the present invention, but should not be used to limit the scope of protection of the present invention. The conditions in the embodiments can be further adjusted according to specific conditions, and simple improvements to the method of the present invention under the premise of the concept of the present invention are all within the scope of protection claimed by the present invention.

[0018] Please see Figures 1-5 This utility model provides a heat dissipation device for lithium batteries, including a battery box 1, a sealing cover 2 on the battery box 1, a first cooling fan 3 on the sealing cover 2, the first cooling fan 3 is used to dissipate the heat in the battery box 1, the battery box 1 is also equipped with an auxiliary heat dissipation mechanism 5, the auxiliary heat dissipation mechanism 5 is used to dissipate the heat accumulated in the gap between each group of lithium battery modules 4, the auxiliary heat dissipation mechanism 5 includes a second cooling fan 51 and a drive motor 55, the second cooling fan 51 is disposed on an adjustment plate 52, a ventilation cavity 12 is provided on the other side of the battery box 1, the ventilation cavity 12 and the second cooling fan 51 are arranged opposite to each other, and a connecting partition 13 is provided on one side of the ventilation cavity 12; The ventilation cavity 12 and the second cooling fan 51 are arranged opposite to each other to form a clear airflow channel. The airflow blown out by the second cooling fan 51 can be directly discharged through the ventilation cavity 12, while driving the hot air in the gap of the lithium battery module 4 to flow quickly, reducing airflow resistance. The upper end of the adjustment plate 52 is provided with a toothed groove 53, and the output end of the drive motor 55 is provided with a drive tooth 54. The drive tooth 54 is located above the toothed groove 53 and meshes with each other. The assembly cavity 11 is also provided with a guide cavity 111, and the adjustment plate 52 is slidably assembled in the guide cavity 111.

[0019] In this embodiment, the auxiliary heat dissipation mechanism 5 drives the transmission gear 54 through the transmission motor 55 to mesh with the tooth groove 53 at the upper end of the adjustment plate 52, thereby causing the adjustment plate 52 to slide in the guide cavity 111, so that the second cooling fan 51 can move laterally to different positions to avoid local overheating.

[0020] In this embodiment, through the combined design of the first cooling fan 3 and the auxiliary cooling mechanism 5, the first cooling fan 3 exhausts the heat inside the battery box 1 from the sealing cover plate 2. The second cooling fan 51 of the auxiliary cooling mechanism 5 can be precisely aligned with the gap between each lithium battery module 4 by sliding the adjustment plate 52, and directly exhaust the heat accumulated in the gap, forming a dual heat dissipation path of overall heat dissipation and local reinforcement, which effectively solves the problem of difficult heat dissipation in the gap in the traditional heat dissipation method and greatly improves the heat dissipation efficiency.

[0021] Please see Figure 1 and Figure 3 The battery box 1 has an assembly cavity 11, and a connecting door is installed on one side of the assembly cavity 11. The drive motor 55 and the drive gear 54 are both concealed inside the assembly cavity 11.

[0022] In this embodiment, the drive motor 55 and the drive gear 54 are concealed inside the assembly cavity 11 of the battery box 1, which can prevent external dust and moisture from directly contacting the core transmission components, reduce wear or failure caused by environmental factors, and prevent the human body or other parts from accidentally touching the transmission structure in motion, thereby improving the overall safety of the device.

[0023] Please see Figure 2 and Figure 5 The lithium battery module 4 is installed by a fixing frame 41. Each lithium battery module 4 is composed of multiple battery cells, and a guide plate 6 is provided between every two battery cells. The guide plate 6 has a ventilation channel 61. A set of partition plates 62 is provided in the ventilation channel 61 of the guide plate 6. The partition plates 62 divide the ventilation channel 61 into left and right parts. Heat-absorbing pads 63 are provided on both sides of the guide plate 6. The heat-absorbing pads 63 are fitted into the pre-reserved cavities on both sides of the guide plate 6. The fixing frame 41 is provided with slots 411. Each set of guide plates 6 is fitted into the slots 411 provided on the fixing frame 41.

[0024] In this embodiment, an air guide plate 6 is provided between every two sets of battery cells in the lithium battery module 4. The ventilation channel 61 opened by the air guide plate 61 is divided into left and right parts by a partition plate 62, which can guide the airflow through the gap between the battery cells and avoid local airflow turbulence. In addition, the heat-absorbing pads 63 on both sides of the air guide plate 6 are directly attached to the battery cells, which can quickly absorb heat and conduct it out through the airflow of the ventilation channel 61, forming an efficient path for heat absorption, flow guidance and heat dissipation, which significantly improves the heat dissipation efficiency and temperature uniformity between the battery cells.

[0025] In the above scheme, it should be noted that the power supply lines of the first cooling fan 3, the second cooling fan 51 and the drive motor 55 are all connected to the internal circuit of the battery box 1. The electrical connection method adopts conventional circuit integration technology, which is widely used and mature and reliable in this field. Therefore, the specific connection method and control logic will not be described in detail here.

[0026] It should also be noted that the heat-absorbing pad 63 uses the existing mature product TCMPGP35 high-performance thermal conductive pad. This material has excellent flexibility and temperature resistance, and can adapt to the bonding requirements of battery cells of different shapes and air guide plate 6. The relevant characteristics are existing technology and will not be elaborated here.

[0027] Working principle and usage process of this utility model: First, the lithium battery module 4 is installed by limiting the slot 411 of the fixing frame 41. A guide plate 6 with heat-absorbing pads 63 is embedded between every two sets of battery cells. The heat-absorbing pads 63 are attached to the battery cells. The ventilation channel 61 of the guide plate 6 is divided into left and right parts by the partition plate 62 to form a regular airflow path. When heat dissipation is required, first open the connecting partition 13. The connecting partition 13 is connected to the ventilation cavity 12 by a rotating shaft. Then, start the first cooling fan 3 to extract and exhaust the heat from the battery box 1. At the same time, the auxiliary cooling mechanism 5 is started. The drive motor 55 drives the drive gear 54 to rotate. Through the meshing with the tooth groove 53 of the adjustment plate 52, the adjustment plate 52 is driven to slide along the guide cavity 111 of the assembly cavity 11. The second cooling fan 51 moves laterally with the adjustment plate 52, aligns with the gaps between each lithium battery module 4, and blows out airflow that is guided by the ventilation channel 61 to carry away the heat between the battery cells. The hot airflow is discharged through the ventilation cavity 12, which is set up opposite to each other, to achieve localized enhanced heat dissipation. When the transmission components need to be repaired, open the connecting door on the side of the assembly cavity 11 to directly maintain the concealed transmission motor 55 and transmission gear 54. When replacing the air guide plate 6, take out the old plate from the slot 411 of the fixing frame 41 and insert the new plate.

[0028] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A heat dissipation device for lithium batteries, comprising a battery case (1) and a lithium battery module (4), characterized in that: The battery box (1) is provided with a sealing cover (2), and the sealing cover (2) is provided with a first cooling fan (3), which is used to dissipate the heat in the battery box (1); The battery box (1) is also equipped with an auxiliary heat dissipation mechanism (5), which is used to dissipate the heat accumulated in the gap between each lithium battery module (4). The auxiliary heat dissipation mechanism (5) includes a second heat dissipation fan (51), an adjustment plate (52), and a drive motor (55). The second heat dissipation fan (51) is located on the adjustment plate (52). The upper end of the adjustment plate (52) is provided with a tooth groove (53). The output end of the drive motor (55) is provided with a drive tooth (54). The drive tooth (54) is located above the tooth groove (53) and meshes with each other.

2. The heat dissipation device for lithium batteries according to claim 1, characterized in that: The battery box (1) has an assembly cavity (11), and a connecting door is installed on one side of the assembly cavity (11). The drive motor (55) and the drive gear (54) are both installed inside the assembly cavity (11).

3. A heat dissipation device for lithium batteries according to claim 2, characterized in that: The assembly cavity (11) is further provided with a guide cavity (111), and the adjustment plate (52) is slidably assembled in the guide cavity (111).

4. A heat dissipation device for lithium batteries according to claim 2, characterized in that: The other side of the battery box (1) is provided with a ventilation cavity (12), which is arranged opposite to the second cooling fan (51). A connecting partition (13) is provided on one side of the ventilation cavity (12).

5. A heat dissipation device for lithium batteries according to claim 1, characterized in that: The lithium battery module (4) is installed by a fixed frame (41). Each lithium battery module (4) is composed of multiple battery cells, and a guide plate (6) is provided between every two sets of battery cells. The guide plate (6) has a ventilation channel (61). A set of partition plates (62) is provided in the ventilation channel (61) of the guide plate (6). The partition plates (62) divide the ventilation channel (61) into left and right parts.

6. A heat dissipation device for a lithium battery according to claim 5, characterized in that: The fixed frame (41) is provided with slots (411), and each set of air guide plates (6) is embedded in the slots (411) provided on the fixed frame (41).

7. A heat dissipation device for a lithium battery according to claim 5, characterized in that: The air guide plate (6) has heat-absorbing pads (63) on both sides, and the heat-absorbing pads (63) are fitted into the pre-reserved cavities on both sides of the air guide plate (6).

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