Heat dissipation structure of lithium iron phosphate battery

Abstract

The utility model discloses a heat dissipation structure of a lithium iron phosphate battery, which belongs to the technical field of lithium iron phosphate batteries and comprises a box body, heat dissipation boxes are fixedly connected to two sides of the box body, vent holes are formed in the side surfaces of the heat dissipation boxes, and a plurality of battery units are fixedly mounted in the box body. A plurality of battery units in the same row are jointly sleeved with fixed rows, and a soaking block is arranged between every two adjacent fixed rows. According to the heat dissipation structure of the lithium iron phosphate battery, fixation and heat conduction of the battery units are achieved through the fixing rows, the fixing rows conduct heat of the battery units to the soaking blocks on the two sides, then the heat is conducted to the heat dissipation fins on the two sides through the heat pipes, circulating air blows through the heat dissipation fins to take away the heat, and uniform heat dissipation of the battery units is achieved. Compared with an existing device, the problem that the temperature of the central battery unit is too high due to the fact that the central battery unit in the battery module is difficult to dissipate heat is avoided, the stability of the battery is improved, and the service life of the battery is prolonged.

Description

Technical Field

[0001] This utility model belongs to the field of lithium iron phosphate battery technology, and in particular relates to a heat dissipation structure for lithium iron phosphate batteries. Background Technology

[0002] Lithium iron phosphate (LFP) batteries are lithium-ion batteries that use lithium iron phosphate as the positive electrode material and carbon as the negative electrode material. During use, LFP batteries generate heat. When the temperature is too high, it can cause the battery to explode, affecting its use. Therefore, it is necessary to dissipate heat from LFP batteries.

[0003] Existing lithium iron phosphate batteries are broadly classified into water-cooled and air-cooled types. Water-cooled batteries have better heat dissipation but are more expensive. Existing air-cooled batteries mostly achieve heat dissipation by adding heat sinks to the outside of the battery module. In actual use, it is difficult to dissipate heat from the battery cells in the center of the battery module, resulting in excessively high temperatures in the central battery cells, which affects battery stability and lifespan.

[0004] To address this issue, we propose a heat dissipation structure for lithium iron phosphate batteries. Utility Model Content

[0005] The purpose of this invention is to solve the problem of uneven heat dissipation in the prior art by proposing a heat dissipation structure for lithium iron phosphate batteries.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A heat dissipation structure for a lithium iron phosphate battery includes a housing, with heat dissipation boxes fixedly connected to both sides of the housing, and ventilation holes provided on the sides of the heat dissipation boxes;

[0008] Multiple battery units are fixedly installed inside the box. A fixed row is provided between the multiple battery units in the same row. A heat dissipation block is provided between two adjacent fixed rows. A heat pipe is fixedly installed through the heat dissipation block. The two ends of the heat pipe extend into the heat dissipation box. A heat dissipation fin is connected between the multiple heat pipes located in the heat dissipation box.

[0009] Preferably, a first thermal pad is provided between the fixed row and the battery unit.

[0010] Preferably, a second thermally conductive pad is provided between the fixed row and the heat spreader block.

[0011] Preferably, the plurality of battery cells inside the housing are arranged in an alternating pattern.

[0012] Preferably, each heat spreader block is provided with two heat pipes, and the two heat pipes are respectively located at the upper and lower parts of the heat spreader block.

[0013] Preferably, one side of the two most distant fixed rows of heat-equalizing blocks is attached to the inner wall of the box.

[0014] Preferably, a heat dissipation plate that fits the top surface of the battery is fixedly connected to the inner top wall of the box, and a conductive groove is opened on the bottom surface of the heat dissipation plate for inserting and electrically connecting the battery terminals.

[0015] In summary, the technical effects and advantages of this utility model are as follows: This lithium iron phosphate battery heat dissipation structure uses a fixed array to fix and conduct heat to the battery cells. The fixed array conducts heat from the battery cells to the heat dissipation blocks on both sides, and then from the heat pipes to the heat dissipation fins on both sides. Circulating air blows across the heat dissipation fins and carries away the heat, thus achieving uniform heat dissipation from the battery cells. Compared with existing devices, this avoids the problem of difficulty in dissipating heat from the central battery cells within the battery module, which can lead to excessively high temperatures in the central battery cells, thereby improving battery stability and lifespan. Attached Figure Description

[0016] Figure 1 This is a schematic cross-sectional view of the present invention.

[0017] Figure 2 for Figure 1 Top view;

[0018] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0019] Figure 5 This is a cross-sectional front view of the present invention;

[0020] Figure 4 This is a cross-sectional structural diagram of the heat sink in this utility model.

[0021] In the diagram: 1. Box body; 2. Heat sink box; 3. Ventilation hole; 4. Battery unit; 5. Fixing bar; 6. Heat spreader; 7. Heat pipe; 8. Heat dissipation fins; 9. First thermal pad; 10. Second thermal pad; 11. Heat sink plate; 12. Conductive groove. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0023] Reference Figure 1-2 A heat dissipation structure for a lithium iron phosphate battery includes a housing 1, with heat dissipation boxes 2 fixedly connected to both sides of the housing 1, and ventilation holes 3 opened on the side of the heat dissipation boxes 2.

[0024] Multiple battery units 4 are fixedly installed inside the box 1. Multiple battery units 4 in the same row are fitted together with a fixed row 5. A heat dissipation block 6 is provided between two adjacent fixed rows 5. A heat pipe 7 is fixedly installed through the heat dissipation block 6. The two ends of the heat pipe 7 extend into the heat dissipation box 2. Multiple heat pipes 7 located in the heat dissipation box 2 are connected together with heat dissipation fins 8.

[0025] In this lithium iron phosphate battery heat dissipation structure, if the battery temperature is low during use, it is only necessary to heat the heat dissipation fins 8, and the heat pipe 7 achieves uniform heating of the heat spreader block 6. The heat spreader block 6 then conducts heat to the fixed row 5, and the fixed row 5 conducts heat to the battery unit 4, which can ensure the stability of the battery when the ambient temperature is low.

[0026] After the battery has been running for a period of time, the battery temperature continues to rise. The airflow blows into the ventilation holes 3 of the heat sink box 2, and the temperature of the heat sink 8 drops accordingly. The heat pipe 7 achieves uniform heat dissipation of the heat dissipation block 6. The heat dissipation block 6 conducts heat to the heat dissipation fixing row 5, and the fixing row 5 conducts heat to the heat dissipation battery unit 4, which can ensure the uniform heat dissipation of the battery unit 4 when the car is running and improve the stability of battery operation.

[0027] Reference Figure 2-3 A first thermal pad 9 is provided between the fixed row 5 and the battery unit 4. The first thermal pad 9 fills the gap between the fixed row 5 and the battery unit 4, thereby improving the heat transfer efficiency between the battery unit 4 and the fixed row 5.

[0028] A second thermal pad 10 is provided between the fixed row 5 and the heat spreader 6. The second thermal pad 10 fills the gap between the fixed row 5 and the heat spreader 6, thereby improving the heat transfer efficiency between the heat spreader 6 and the fixed row 5.

[0029] Reference Figure 1-2 Since the battery unit 4 is cylindrical, the conventional rectangular array arrangement of the battery units 4 may cause uneven temperature of the heat spreader 6. To solve the above problem, the multiple battery units 4 inside the housing 1 are arranged in an alternating manner, so as to avoid the problem that uneven temperature on the heat spreader 6 will affect the heat dissipation effect of the heat pipe 7 on the battery unit 4, thereby improving the heat dissipation effect of the battery unit 4.

[0030] Reference Figure 4 Each heat spreader block 6 is equipped with two heat pipes 7, which are respectively located at the top and bottom of the heat spreader block 6. This improves the uniformity of heat dissipation from the heat pipes 7 to the heat spreader block 6, thereby improving the heat dissipation effect on the battery unit 4.

[0031] Reference Figure 2 The two fixed rows 5 that are furthest apart are attached to the inner side wall of the box body 1 on the side facing away from the heat spreader 6. In this way, heat dissipation is achieved by attaching the fixed rows 5 to the side wall of the box body 1 while reducing the manufacturing cost of the heat pipe 7 and the heat spreader 6, thereby reducing the cost of use.

[0032] Reference Figure 4-5 The inner top wall of the box 1 is fixedly connected to a heat dissipation plate 11 that fits the top surface of the battery. The bottom surface of the heat dissipation plate 11 has a conductive groove 12 for inserting and electrically connecting the battery terminals. The heat dissipation plate 11 can evenly dissipate heat from the top surface of the battery, while the conductive groove 12 can prevent the heat dissipation plate 11 from affecting the electrical connection of the battery terminals.

[0033] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A heat dissipation structure for a lithium iron phosphate battery, comprising a housing (1), characterized in that, The box body (1) is fixedly connected to heat dissipation boxes (2) on both sides, and the heat dissipation boxes (2) have ventilation holes (3) on their sides; Multiple battery units (4) are fixedly installed inside the box (1). A fixed row (5) is provided between the multiple battery units (4) in the same row. A heat dissipation block (6) is provided between two adjacent fixed rows (5). A heat pipe (7) is fixedly installed through the heat dissipation block (6). The two ends of the heat pipe (7) extend into the heat dissipation box (2). A heat dissipation fin (8) is connected between the multiple heat pipes (7) located in the heat dissipation box (2).

2. The heat dissipation structure for a lithium iron phosphate battery according to claim 1, characterized in that, A first thermal pad (9) is provided between the fixed row (5) and the battery unit (4).

3. The heat dissipation structure for a lithium iron phosphate battery according to claim 2, characterized in that, A second heat-conducting pad (10) is provided between the fixed row (5) and the heat-spreading block (6).

4. The heat dissipation structure for a lithium iron phosphate battery according to claim 1, characterized in that, The multiple battery cells (4) inside the box (1) are arranged in an alternating pattern.

5. The heat dissipation structure for a lithium iron phosphate battery according to claim 1, characterized in that, Each heat spreader block (6) is provided with two heat pipes (7), and the two heat pipes (7) are respectively located on the upper and lower parts of the heat spreader block (6).

6. The heat dissipation structure for a lithium iron phosphate battery according to claim 1, characterized in that, The two fixed rows (5) that are furthest apart are attached to the inner wall of the box body (1) on one side facing away from the heat spreader (6).

7. The heat dissipation structure for a lithium iron phosphate battery according to claim 1, characterized in that, The inner top wall of the box (1) is fixedly connected to a heat sink plate (11) that fits the top surface of the battery. The bottom surface of the heat sink plate (11) has a conductive groove (12) for inserting and electrically connecting the battery terminals.

Images