Battery thermal management device based on thermoelectric water cooling technology

Abstract

A battery thermal management device based on a thermoelectric water cooling technology comprises a first thermal insulation layer connected with a first power battery and a second thermal insulation layer connected with a second power battery, at least one fixing hole is formed in each of the first heat insulation layer and the second heat insulation layer, a thermoelectric refrigeration sheet group is arranged in each fixing hole, a first thermoelectric refrigeration sheet group is arranged on the first heat insulation layer, and a second thermoelectric refrigeration sheet group is arranged on the second heat insulation layer; and a water-cooling heat dissipation module is arranged between the first thermoelectric refrigeration sheet group and the second thermoelectric refrigeration sheet group. According to the battery thermal management device, the thermoelectric refrigeration technology and the liquid cooling heat transfer technology are combined, the power is adjusted by changing the magnitude of the current, and refrigeration / heating is flexibly controlled by changing the positive and negative of the current, so that the advantages of compact structure, small size, long service life, rapid refrigeration, simple operation, no environmental pollution and the like of the thermoelectric refrigeration sheet are exerted; the defect that a traditional heat management module can only refrigerate but not heat is overcome.

Description

Technical Field

[0001] The utility model belongs to a battery heat management device based on thermoelectric water cooling technology. Background Art

[0002] Power lithium batteries are an important part of new energy vehicles. Their performance determines the vehicle's mileage and safety performance. Extending the life of power lithium batteries is of great significance to reducing the cost of new energy vehicles and protecting the environment. The optimal operating temperature range of power lithium batteries is 20-45°C, and the maximum temperature difference is less than 5°C. If this temperature range is exceeded, the performance, life and safety of the power lithium battery pack will be reduced.

[0003] Currently, commonly used technologies use air cooling, liquid cooling, phase change materials and heat pipes to dissipate heat from battery packs. However, these technologies suffer from low heating efficiency and large size. At the same time, such thermal management methods can only cool the battery, but cannot heat and insulate the battery in low temperature environments. Utility Model Content

[0004] The technical problem to be solved by the utility model is: in view of the problem of poor thermal management of power batteries in the prior art, the utility model provides a battery thermal management device based on thermoelectric water cooling technology.

[0005] The technical solution of the utility model is specifically as follows:

[0006] A battery thermal management device based on thermoelectric water cooling technology comprises a first thermal insulation layer connected to a first power battery, and a second thermal insulation layer connected to a second power battery; the first thermal insulation layer and the second thermal insulation layer are each provided with at least one fixing hole, a thermoelectric cooling sheet group is arranged in each fixing hole, a first thermoelectric cooling sheet group is arranged on the first thermal insulation layer, a second thermoelectric cooling sheet group is arranged on the second thermal insulation layer, and a water cooling heat dissipation module is arranged between the first thermoelectric cooling sheet group and the second thermoelectric cooling sheet group.

[0007] The first thermal insulation layer and the second thermal insulation layer are both made of thermal insulation cotton.

[0008] Six fixing holes are opened on the first heat insulation layer and the second heat insulation layer, and the six fixing holes are arranged in a matrix.

[0009] The first thermoelectric cooling sheet group and the second thermoelectric cooling sheet group, each thermoelectric cooling sheet group is composed of a plurality of cooling sheets, and each thermoelectric cooling sheet is in direct contact with the surface of the power lithium battery.

[0010] The water-cooling heat dissipation module uses a copper tube with a square cross-section, and the copper tube circulates the coolant through a water pump.

[0011] The beneficial effects of the utility model are as follows: the battery thermal management device in the utility model combines thermoelectric refrigeration technology with liquid cooling heat transfer technology, adjusts power by changing the current size, and flexibly controls cooling / heating by changing the positive and negative current, giving full play to the advantages of the thermoelectric cooling sheet, such as compact structure, small size, long life, rapid cooling, simple operation, and no environmental pollution, and overcomes the defect that traditional thermal management modules can only cool but not heat. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is the overall structure diagram of the utility model;

[0013] Figure 2 This is a schematic diagram of the water cooling module. DETAILED DESCRIPTION

[0014] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0015] like Figure 1 As shown, a battery thermal management device based on thermoelectric water cooling technology includes a first insulation layer 3 connected to a first power battery 1, and a second insulation layer 4 connected to a second power battery 2; the first insulation layer 3 and the second insulation layer 4 are each provided with at least one fixing hole, and a thermoelectric cooling sheet group is arranged in each fixing hole, that is, a first thermoelectric cooling sheet group 5 is arranged on the first insulation layer 3, a second thermoelectric cooling sheet group 6 is arranged on the second insulation layer 4, and a water-cooling heat dissipation module 7 is arranged between the first thermoelectric cooling sheet group 5 and the second thermoelectric cooling sheet group 6.

[0016] Furthermore, the first insulation layer 3 and the second insulation layer 4 are both made of insulation cotton, and fixed holes are opened inside for placing the cooling fins in the thermoelectric cooling fin group, which is convenient for fixing the position of the cooling fins, reducing heat transfer and lowering energy consumption.

[0017] Furthermore, six fixing holes are opened on the first heat insulation layer 3 and the second heat insulation layer 4, and the six fixing holes are arranged in a matrix.

[0018] Furthermore, each of the first thermoelectric cooling sheet group 5 and the second thermoelectric cooling sheet group 6 is composed of a plurality of cooling sheets, and each thermoelectric cooling sheet is in direct contact with the surface of the power lithium battery to cool the battery.

[0019] Furthermore, the water-cooled heat dissipation module 7 uses a copper tube 8 with a square cross section, and the copper tube 8 circulates the coolant through a water pump. And the positions contacting the thermoelectric cooling sheet groups on both sides are welded with square copper sheets of the same size as the cooling sheet, which facilitates contact and heat exchange with the thermoelectric cooling sheet, thereby enhancing the heat dissipation capacity of the water-cooled heat dissipation module.

[0020] In this way, with the water-cooled heat dissipation module 7 as the center, a heat insulation layer and a thermoelectric refrigeration sheet group on the left and right constitute an integral thermoelectric water-cooled heat dissipation group, which is placed between two automotive power batteries and stacked according to the actual number of batteries.

[0021] The automotive battery thermal management device can be operated in cooling mode or heating mode according to demand, so as to keep the automotive battery in the optimal operating temperature range of 20 to 45°C, with the maximum temperature difference being less than 5°C, thereby reducing battery energy consumption and extending battery life.

[0022] Cooling mode: In a high temperature environment, current is passed through the first thermoelectric cooling sheet group 5 and the second thermoelectric cooling sheet group 6 respectively, so that the end of the thermoelectric cooling sheet in the device that contacts the vehicle power battery is cooled, and the end that contacts the water-cooled heat dissipation module 7 is heated. The coolant in the copper tube of the water-cooled heat dissipation module 7 is circulated through a water pump to dissipate the heat at the hot end of the cooling sheet, thereby reducing the temperature of the vehicle power battery. The cooling power of the thermoelectric cooling sheet can be flexibly controlled by changing the current size, so the temperature of the vehicle power battery can be flexibly controlled. At the same time, combining liquid cooling to dissipate the heat at the hot end of the thermoelectric cooling sheet can improve the cooling efficiency of the thermoelectric cooling sheet and enhance the cooling capacity.

[0023] Heating mode: In a low temperature environment, current is passed through the first thermoelectric cooling sheet group 5 and the second thermoelectric cooling sheet group 6 respectively, so that the end of the thermoelectric cooling sheet in the device that contacts the vehicle power battery is heated, and the end that contacts the water cooling module 7 is cooled. The waste heat recovery device recovers the waste heat of the vehicle drive motor to heat the coolant, and the heated coolant enters the water cooling module 7 to heat the cold end of the cooling sheet, so as to keep the temperature of the vehicle power battery in the optimal operating temperature range.

[0024] The working principle of the utility model is:

[0025] The automotive battery thermal management device in the utility model is composed of two layers of heat insulation, two layers of thermoelectric cooling sheet groups, and a water cooling module as a unit, and the structure is as follows Figure 2 It can be placed between two automotive power batteries, and the required number of thermoelectric water-cooled automotive battery thermal management devices can be installed according to actual needs. Figure 1 ,The modular design gives it great flexibility in application.

[0026] Compared with general mechanical refrigeration, semiconductor thermoelectric cooling chips do not require mechanical moving parts, nor do they require refrigerants such as ammonia and Freon, refrigerants and their transmission pipelines. They have the advantages of compact structure, small size, long life, rapid refrigeration, fast hot and cold conversion, simple operation, and no environmental pollution. The conversion between cooling and heating can be achieved by changing the direction of the positive and negative electrodes, and the hot and cold conversion is fast and easy to operate.

[0027] The above is only a preferred embodiment of the present invention. It should be pointed out that those skilled in the art can make several changes and improvements without departing from the overall concept of the present invention, and these should also be regarded as the protection scope of the present invention.

Claims

1. A battery thermal management device based on thermoelectric water cooling technology, characterized in that: The invention comprises a first heat insulation layer (3) connected to a first power battery (1), and a second heat insulation layer (4) connected to a second power battery (2); the first heat insulation layer (3) and the second heat insulation layer (4) are each provided with at least one fixing hole, a thermoelectric cooling sheet group is provided in each fixing hole, a first thermoelectric cooling sheet group (5) is provided on the first heat insulation layer (3), a second thermoelectric cooling sheet group (6) is provided on the second heat insulation layer (4), and a water cooling heat dissipation module (7) is provided between the first thermoelectric cooling sheet group (5) and the second thermoelectric cooling sheet group (6).

2. A battery thermal management device based on thermoelectric water cooling technology according to claim 1, characterized in that: The first heat insulation layer (3) and the second heat insulation layer (4) are both made of heat insulation cotton.

3. A battery thermal management device based on thermoelectric water cooling technology according to claim 1, characterized in that: Six fixing holes are provided on the first heat insulation layer (3) and the second heat insulation layer (4), and the six fixing holes are arranged in a matrix.

4. The battery thermal management device based on thermoelectric water cooling technology according to claim 1, characterized in that: The first thermoelectric cooling sheet group (5) and the second thermoelectric cooling sheet group (6), each thermoelectric cooling sheet group is composed of a plurality of cooling sheets, and each thermoelectric cooling sheet is in direct contact with the surface of the power lithium battery.

5. The battery thermal management device based on thermoelectric water cooling technology according to claim 1, characterized in that: The water-cooling heat dissipation module (7) uses a copper tube (8) with a square cross section, and the copper tube (8) circulates coolant through a water pump.

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