A lithium battery module heat dissipation structure

Abstract

The utility model provides a kind of lithium battery module heat dissipation structure, including several orderly arranged and arranged cylindrical battery and heat dissipation metal pipe, the cylindrical battery and the heat dissipation metal pipe are staggered arrangement, and every four the cylindrical battery equal interval with the heat dissipation metal pipe ring around is pasted, this heat dissipation structure is placed heat dissipation metal pipe in the four around cylindrical battery, to accelerate the heat dissipation of cylindrical battery;And improve the heat dissipation area by the radian of heat dissipation metal pipe and cylindrical battery contact, and utilize the flow mode of speed and coolant, further improve the heat dissipation of battery module.

Description

Technical Field

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

[0002] With the rapid development of electric vehicles, the safety issues caused by thermal runaway have received widespread attention. The optimal operating temperature for lithium batteries is between 25 and 40 degrees Celsius, with a temperature difference not exceeding 5 degrees Celsius. However, in actual manufacturing processes, batteries generate a large amount of heat due to high-frequency, high-rate discharge, which is difficult to dissipate, thus easily leading to thermal runaway and affecting the safety of the vehicle and its occupants.

[0003] In addition, there are five main types of heat dissipation methods for lithium batteries: air cooling, liquid cooling, heat pipe cooling, phase change material cooling, and composite cooling. Liquid cooling systems have advantages such as high cooling efficiency and low energy consumption. They can effectively remove heat from both prismatic and cylindrical batteries through the flow of the cooling medium. Furthermore, their regular shape and high integration make them suitable for various driving conditions in electric vehicles, and liquid cooling systems have become the mainstream for lithium battery heat dissipation.

[0004] Therefore, efficiently dissipating heat from lithium battery modules through liquid cooling systems is an urgent problem that needs to be solved. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of the prior art by providing a heat dissipation structure for a lithium battery module, which optimizes the contact angle and the flow direction of the coolant, thereby improving the heat dissipation performance of the lithium battery module.

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

[0007] This utility model provides a heat dissipation structure for a lithium battery module, including a plurality of cylindrical batteries and heat dissipation metal pipes arranged in an orderly manner. The cylindrical batteries and the heat dissipation metal pipes are staggered, and every four cylindrical batteries are equally spaced and attached to the heat dissipation metal pipes.

[0008] Furthermore, the heat dissipation metal pipe includes a cylindrical metal pipe body, one end of which is provided with a cylindrical inlet end, and the other end of which is provided with a cylindrical outlet end.

[0009] Furthermore, the diameters of the inlet and outlet are the same, and both are smaller than the diameter of the metal pipe body.

[0010] Furthermore, the outer peripheral wall of the metal tube is provided with equally spaced arc-shaped grooves.

[0011] Furthermore, the arc-shaped groove is provided along the length direction of the metal tube so as to be in contact with the length direction of the cylindrical battery.

[0012] Furthermore, the arc angle of the arc-shaped groove is 73 degrees.

[0013] Furthermore, the metal tube is hollow.

[0014] Furthermore, each pair of adjacent metal tubes forms a group, and the coolant flows in opposite directions in adjacent groups of metal tubes.

[0015] The beneficial effects of this utility model are as follows: the heat dissipation structure accelerates the heat dissipation of the cylindrical battery by placing heat dissipation metal pipes around the cylindrical battery; the heat dissipation area is increased by the arc of the heat dissipation metal pipes in contact with the cylindrical battery; and the heat dissipation of the battery module is further improved by utilizing speed and the flow mode of coolant. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a heat dissipation structure for a lithium battery module.

[0017] Figure 2 This is a schematic diagram of the installation of a cylindrical battery and a heat dissipation metal tube.

[0018] Figure 3 This is a schematic diagram of the structure of a heat dissipation metal pipe;

[0019] Figure 4 This is a diagram showing the flow direction of the coolant.

[0020] Figure 5 The graph shows the results of the highest temperature and maximum temperature difference of the orthogonal experimental module. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the scope of the present utility model.

[0022] A heat dissipation structure for a lithium battery module includes a plurality of cylindrical batteries 1 and heat dissipation metal pipes 2 arranged in an orderly manner. The cylindrical batteries 1 and the heat dissipation metal pipes 2 are staggered, and every four cylindrical batteries 1 are equally spaced and attached to the heat dissipation metal pipes 2.

[0023] The heat dissipation metal pipe 2 includes a cylindrical metal pipe body 201, one end of which is provided with a cylindrical inlet end 202, and the other end of which is provided with a cylindrical outlet end 203.

[0024] The inlet end 202 and the outlet end 203 have the same diameter, and both are smaller than the diameter of the metal tube body 201.

[0025] The outer peripheral wall of the metal tube 201 is provided with equally spaced arc-shaped grooves 204.

[0026] The arc-shaped groove 204 is arranged along the length direction of the metal tube 201 so as to be in contact with the length direction of the cylindrical battery 1.

[0027] The arc angle of the arc-shaped groove 204 is 73 degrees.

[0028] The metal tube 201 is hollow.

[0029] Each pair of adjacent metal tubes 201 forms a group, and the coolant flows in opposite directions in adjacent groups of metal tubes 201.

[0030] Example 1:

[0031] Please see Figures 1 to 4 There are multiple cylindrical batteries 1, which are arranged in a square shape and are evenly spaced. The gaps between adjacent cylindrical batteries 1 are used to install heat dissipation metal pipes 2. The outer wall of the heat dissipation metal pipes 2 is provided with four arc-shaped grooves 204 at equal intervals. The arc-shaped grooves 204 can be attached to the cylindrical batteries 1 along the length direction of the cylindrical batteries 1, so as to dissipate heat to the maximum extent.

[0032] Depend on Figure 2 As shown, a cylindrical battery 1 has four heat dissipation metal tubes 2 arranged at equal arc intervals attached around its perimeter.

[0033] The heat dissipation metal pipe 2 has a hollow structure and is filled with coolant, which is a 50% ethylene glycol solution.

[0034] The heat dissipation metal pipe 2 is made of aluminum alloy, and the wall thickness of the heat dissipation metal pipe 3 is 1mm, which is conducive to heat exchange between the heat dissipation metal pipe 2 and the battery. During the flow process, a large amount of heat can be carried away, thereby achieving the heat dissipation effect of the battery module.

[0035] The arc angle of the arc-shaped groove 204 is 73 degrees.

[0036] The angle of the arc-shaped groove 204 is the contact range between the metal tube 201 and the heat dissipation metal tube 2.

[0037] In this embodiment, an orthogonal experiment is used, that is, the angle α of the arc groove 204 and the coolant flow direction are selected. p and metal tube body 201 internal coolant flow rate v，These three factors are considered because they are closely related to heat conduction, convection heat transfer, and process uniformity, and are the core variables for heat dissipation. As shown in Table 1, the highest temperature and maximum temperature difference of the battery module are used as evaluation indicators. The temperature is set to 25℃ and the discharge time is 1000s.

[0038] Table 1 Orthogonal Experimental Scheme

[0039]

[0040] Depend on Figure 5 It can be seen that the highest temperature and the maximum temperature difference are the lowest in experiment number 13, making it the optimal solution.

[0041] Depend on Figure 5 It can be seen that the difference between the highest temperature and the maximum temperature difference in test numbers 1 to 4 is small because the angle of the arc groove 204 is small and the flow rate is low, resulting in insufficient heat transfer efficiency.

[0042] That is, when the angle α of the arc groove 204 increases from 58° to 73°, the highest temperature of the module decreases by 3.41° and the maximum temperature difference decreases by 2.40°, indicating that increasing the heat transfer area can significantly improve heat dissipation performance.

[0043] The embodiments described above merely illustrate the implementation of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be defined by the appended claims.

Claims

1. A heat dissipation structure for a lithium battery module, characterized in that: It includes several cylindrical batteries (1) and heat dissipation metal pipes (2) arranged in an orderly manner. The cylindrical batteries (1) and the heat dissipation metal pipes (2) are staggered, and every four cylindrical batteries (1) are equally spaced and attached to the heat dissipation metal pipes (2).

2. The heat dissipation structure for a lithium battery module according to claim 1, characterized in that: The heat dissipation metal pipe (2) includes a cylindrical metal pipe body (201), one end of which is provided with a cylindrical inlet end (202), and the other end of which is provided with a cylindrical outlet end (203).

3. The heat dissipation structure for a lithium battery module according to claim 2, characterized in that: The inlet end (202) and the outlet end (203) have the same pipe diameter, and both are smaller than the pipe diameter of the metal pipe body (201).

4. The heat dissipation structure for a lithium battery module according to claim 2, characterized in that: The outer peripheral wall of the metal tube (201) is provided with arc-shaped grooves (204) at equal intervals.

5. A heat dissipation structure for a lithium battery module according to claim 4, characterized in that: The arc-shaped groove (204) is arranged along the length direction of the metal tube (201) so as to be in contact with the length direction of the cylindrical battery (1).

6. The heat dissipation structure for a lithium battery module according to claim 5, characterized in that: The arc angle of the arc-shaped groove (204) is 73 degrees.

7. A heat dissipation structure for a lithium battery module according to claim 2, characterized in that: The metal tube (201) is hollow.

8. The heat dissipation structure for a lithium battery module according to claim 7, characterized in that: Each pair of adjacent metal tubes (201) forms a group, and the coolant flows in opposite directions in adjacent groups of metal tubes (201).

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