Composite battery thermal management system

Abstract

The utility model discloses a composite battery thermal management system, which comprises an air conditioner condensate water recovery system and a battery pack system, and the air conditioner condensate water recovery system comprises an automobile air conditioner evaporator, a condensate water collection pipe, a water storage tank, a low-power pump, a filter and pipelines for connecting all equipment, the battery pack system comprises a fan, a battery pack support, single batteries, a liquid storage tank, hydrophilic fiber strips and rivets. The air conditioner condensate water recovery system can convey recovered automobile air conditioner condensate water into the liquid storage tank in the battery pack system, the condensate water is adsorbed to the position near the surface of a battery through the capillary action of the hydrophilic fiber strips, then the wetted hydrophilic fiber strips can evaporate and absorb heat under the action of the fan, and the battery pack system is used for recovering the condensate water. And the temperature uniformity of the battery is improved while the heat generated by the battery is taken away. The composite battery thermal management system provided by the utility model can recycle the condensate water of the automobile air conditioner, can improve the heat dissipation capability and temperature uniformity of the battery pack, and is energy-saving and environment-friendly.

Description

Technical Field

[0001] The present invention relates to the field of battery thermal management technology, and in particular to a composite battery thermal management system, which aims to provide a novel, efficient and energy-saving battery thermal management technology, and in particular to a battery thermal management system that is a composite of active air cooling and hydrophilic fiber liquid cooling. Background Art

[0002] At present, the demand for new energy vehicles, including pure electric vehicles and hybrid vehicles, is increasing. As the core component of this type of new energy vehicles, lithium-ion batteries will quickly heat up and increase in temperature over time when they are working continuously or at high charge and discharge rates. The charge and discharge efficiency, capacity and safety of the battery pack are greatly affected by temperature. Battery pack temperatures that are too low, too high, or have poor temperature uniformity will affect the battery's performance and even cause safety accidents such as fires and explosions. Therefore, a reliable battery thermal management system is needed to maintain the safe and efficient operation of the battery pack. Common battery thermal management system cooling strategies mainly include: air cooling, liquid cooling, phase change material cooling, heat pipe cooling, and composite cooling.

[0003] In recent years, liquid cooling methods based mainly on liquid cooling plates have been widely used in new energy vehicle battery thermal management systems due to their efficient heat transfer capabilities. However, this also generates additional power consumption to drive the flow of coolant, and the cooling capacity is poor when the battery pack is running at high load and under extreme operating conditions. Summary of the invention

[0004] In view of the problems and shortcomings in the prior art, the present invention provides a composite battery thermal management system which uses automobile air-conditioning condensate as coolant and has high heat exchange efficiency and low system energy consumption.

[0005] The technical solution adopted by the present invention is as follows: The present invention mainly includes:

[0006] A composite battery thermal management system includes an air conditioning condensate recovery system and a battery pack system. The air conditioning condensate recovery system includes an automobile air conditioning evaporator and a condensate collection pipe, a water storage tank, a low-power pump, a filter, and pipes connecting various devices. The battery pack system includes a fan, a battery pack bracket, a single cell, a liquid storage tank, a hydrophilic fiber strip, and a rivet.

[0007] The condensed water collection pipe is connected to the water storage tank by a pipeline, so that the water storage tank can recover the condensed water generated when the automobile air-conditioning evaporator exchanges heat with the outside air. The low-power pump can drive the condensed water recovered in the water storage tank to flow. The low-power pump is connected to the filter by a pipeline, and the condensed water can flow through the filter and the battery pack system under the drive of the low-power pump.

[0008] Preferably, the water storage tank is provided with a drain outlet so that excess recovered condensed water can be directly discharged to the environment.

[0009] Among them, the preferred low-power pump includes but is not limited to an electronic water pump for new energy vehicles, and the requirements for the selection head, flow rate, etc. of the low-power pump can be reduced by adjusting the piping layout of the air-conditioning condensate water recovery system.

[0010] Among them, the preferred filters include but are not limited to filter screens, filter cartridge filters, magnetic filters, cyclone separators, etc., which are used to remove sludge, oil stains, solid impurities, etc. mixed in the condensed water.

[0011] The air conditioning condensate water recovery system transports the collected and filtered condensate to the liquid storage tank in the battery pack system through a pipeline. The liquid storage tank is located directly below the single battery. The liquid storage tank includes a tank body and a tank cover. The tank body is directly connected to the bottom end of the battery pack bracket. Both ends of the tank cover are connected to the left and right sides of the tank body and are provided with a plurality of small through holes. The hydrophilic fiber strips are slender and fluffy and can pass through the small through holes to contact the condensate in the tank body. Under the action of the tank cover, the battery pack bracket is not in direct contact with the condensate in the tank body.

[0012] The battery pack bracket fixes the single cell from the upper and lower ends, and large through holes are provided at the upper and lower ends of the central axis of the single cell for connecting the single cell in series / parallel. The battery pack bracket forms a channel with an inlet and an outlet to allow fluid to flow through. Small through holes are provided at the upper and lower ends of the battery pack bracket respectively. The small through holes and the small through holes of the liquid storage tank cover are located on the same axis and are of the same size. The hydrophilic fiber strips can pass through the small through holes at the upper and lower ends of the battery pack bracket. The upper end of the battery pack bracket protrudes upward, and the protrusion has horizontal rivet holes so that the rivets can be installed and fixed on the protrusion at the upper end of the battery pack bracket.

[0013] The number of the small through holes on the liquid storage tank cover and the number of the small through holes at the upper and lower ends of the battery pack bracket depend on the number of the hydrophilic fiber strips.

[0014] By fixing the battery pack bracket with rivets and small through holes at the upper end, the hydrophilic fiber strip will not have a large displacement in the axial direction and the direction perpendicular to the axial direction.

[0015] The hydrophilic fiber strips will not be broken due to the fixation of the rivets before or after absorbing water.

[0016] After being saturated and wetted, the hydrophilic fiber strips will not break due to gravity and the action of the fan.

[0017] The hydrophilic fiber strips can contact the condensed water in the liquid storage tank body and can make the condensed water wet the hydrophilic fiber strips under the capillary action.

[0018] Preferably, the liquid storage tank body and tank cover are made of insulating and fireproof materials.

[0019] Preferably, a plurality of said single cells or battery packs may share one liquid storage tank.

[0020] Preferably, the liquid storage tank may be provided with an inlet / outlet, so that cooling water can be introduced from the inlet or excess condensed water can be discharged when the recovered condensed water is insufficient.

[0021] Preferably, the battery pack bracket is made of insulating and fireproof material.

[0022] Preferably, the large through holes at the upper and lower ends of the battery pack bracket can be opened into different calibers according to the size, shape and wiring requirements of the single battery.

[0023] Preferably, the single cell is a cylindrical cell or a square cell, and the surface of the single cell may be waterproofed.

[0024] Preferably, the hydrophilic fiber strips are made of thermally conductive super-hydrophilic fiber materials, including but not limited to natural fiber cotton, linen, silk, wool, etc.

[0025] Preferably, the hydrophilic fiber strips are evenly distributed around the single battery, and adjacent hydrophilic fiber strips are spaced 5 to 10 mm apart. The hydrophilic fiber strips can be in direct contact with the surface of the single battery or maintain a distance of 3 to 5 mm.

[0026] Preferably, the hydrophilic fiber strip can be squeezed and tightened, or a thin rope / steel wire can be inserted into the center of the hydrophilic fiber strip.

[0027] Preferably, the wind direction of the fan should be perpendicular to the central axis of the single battery.

[0028] Compared with the existing battery thermal management technology, the present invention has the following characteristics:

[0029] The present invention proposes a battery thermal management system that uses recycled automobile air conditioning condensate as a coolant and combines active air cooling with hydrophilic fiber liquid cooling. By using recycled automobile air conditioning condensate as a coolant, the cost of battery thermal management can be reduced. The hydrophilic fiber strips made of hydrophilic fiber materials can drive the flow of condensate through the surface tension (capillary effect) between water and fiber to wet the hydrophilic fiber strips. Then, under the action of the air flow generated by the fan, the condensate on the hydrophilic fiber strips can evaporate and absorb heat, which can effectively take away the heat generated by the battery pack and improve the temperature uniformity of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0031] Figure 1 This is a schematic diagram of the composite battery thermal management system proposed by the present invention;

[0032] Figure 2 This is a schematic diagram of the battery pack structure proposed by the present invention. DETAILED DESCRIPTION

[0033] In order to more clearly illustrate the technical solution proposed by the present invention, the drawings required for use in the description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present utility model. For ordinary technicians in this field, other embodiments can be obtained based on these drawings without paying creative work.

[0034] like Figure 1 As shown:

[0035] A composite battery thermal management system consists of an air conditioning condensate recovery system and a battery pack system. The air conditioning condensate recovery system includes an automobile air conditioning evaporator and a condensate collection pipe 1, a water storage tank 2, a low-power pump 3, a filter 4 and pipelines connecting various devices.

[0036] The condensed water collection pipe 12 is connected to the water tank 2 by a pipeline, so that the water tank 2 can recover the condensed water generated when the automobile air-conditioning evaporator 11 exchanges heat with the outside air. The low-power pump 3 can drive the condensed water recovered in the water tank 2 to flow. The low-power pump 3 is connected to the filter 4 by a pipeline, and the condensed water can flow through the filter 4 and the battery pack system under the drive of the low-power pump 3.

[0037] The water storage tank 2 may be provided with a drain outlet so that the excess recovered condensed water can be directly discharged to the environment.

[0038] The requirements for the selection head, flow rate, etc. of the low-power pump 3 can be reduced by adjusting the pipeline layout of the air-conditioning condensate water recovery system.

[0039] like Figure 2 As shown:

[0040] The battery pack system includes a fan 5, a battery pack bracket 8, a single cell 6, a liquid storage tank 7, a hydrophilic fiber strip 9, and a rivet 10, wherein the liquid storage tank 7 is composed of a tank body 72 and a tank cover 71, the liquid storage tank 7 is located directly below the single cell 6, the tank body 72 is directly connected to the bottom end of the battery pack bracket 8, the two ends of the tank cover 71 are connected to the left and right sides of the tank body 72 and are provided with a plurality of small through holes, and the hydrophilic fiber strip 9 is slender and fluffy.

[0041] The hydrophilic fiber strips 9 can pass through the small through holes to contact the condensed water in the trough body 72 . Under the action of the trough cover 71 , the battery pack bracket 8 does not directly contact the condensed water in the trough body 72 .

[0042] The battery pack support 8 can fix the single battery 6 and form a channel with an inlet and an outlet to allow fluid to pass through.

[0043] The battery support 8 has large through holes at the upper and lower ends of the central axis of the single battery 6 for connecting the single battery in series / parallel. The size of the large through holes depends on the size of the single battery 6 and the wiring requirements.

[0044] Small through holes with the same axis and size as the small through holes on the slot cover 71 are formed at the upper and lower ends of the battery pack bracket 8, so that the hydrophilic fiber strips 9 can pass through and be fixed laterally.

[0045] The upper end of the battery pack bracket 8 protrudes upward at the axis position of the small through hole and is provided with a rivet hole. The rivet 10 can fix the hydrophilic fiber strip 9 through the rivet hole so that it will not be displaced in the axial direction.

[0046] Under the action of the low-power pump 3 and the filter 4, the air-conditioning condensate water recovery system filters the air-conditioning condensate and transports it to the liquid storage tank 7. After encountering the condensate water, the hydrophilic fiber strips 9 in the battery pack system can naturally absorb the condensate water into the hydrophilic fiber strips 9 and moisten it due to the surface tension (capillary effect) between the hydrophilic fiber and water. The hydrophilic fiber strips can maintain a distance of 3 to 5 mm or direct contact with the surface of the single battery 6.

[0047] Under the action of the fan 5, the condensed water in the wetted hydrophilic fiber strips can evaporate and absorb heat, thereby taking away the heat generated by the single battery 6, while improving the temperature uniformity of the battery pack. The condensed water in the hydrophilic fiber strips 9 can automatically absorb the condensed water after evaporation.

[0048] The hydrophilic fiber strips 9 are evenly distributed on the surface of the single battery 6. The number, size and position of the hydrophilic fiber strips 9 can be determined according to the type of the single battery (including cylindrical battery and square battery). The distance between two adjacent hydrophilic fiber strips is 5 to 10 mm.

[0049] The liquid storage tank 7 may be provided with an inlet / outlet, so that cooling water can be introduced from the inlet or excess condensed water can be discharged when the recovered condensed water is insufficient.

[0050] In this way, the air conditioning condensate recovery system can provide air conditioning condensate to the battery pack system, and the condensate is adsorbed to the battery surface through the capillary effect of the hydrophilic fiber material. Under the action of the fan, the condensate evaporates and absorbs the heat generated by the battery, and at the same time, the temperature uniformity of the battery can be further improved. Due to the capillary effect of the hydrophilic fiber, there is no need for other power consumption to drive the condensate flow, thus achieving the purpose of energy saving.

[0051] The above descriptions are merely embodiments of the present invention, but the implementation methods of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A composite battery thermal management system, characterized in that: It includes an air-conditioning condensate recovery system and a battery pack system. The air-conditioning condensate recovery system includes an automobile air-conditioning evaporator and a condensate collection pipe, a water storage tank, a low-power pump, a filter and pipes connecting various devices. The battery pack system includes a fan, a battery pack bracket, a single cell, a liquid storage tank, a hydrophilic fiber strip and a rivet.

2. The composite battery thermal management system according to claim 1, characterized in that: The condensed water collection pipe is connected to the water storage tank by a pipeline, so that the water storage tank can recover the condensed water generated when the automobile air-conditioning evaporator exchanges heat with the outside air. The low-power pump can drive the condensed water recovered in the water storage tank to flow. The low-power pump is connected to the filter by a pipeline, and the condensed water can flow through the filter and the battery pack system under the drive of the low-power pump.

3. The composite battery thermal management system according to claim 1, characterized in that: The air conditioning condensate water recovery system transports the collected and filtered condensate through a pipeline to a liquid storage tank in the battery pack system. The liquid storage tank is located directly below the single cell. The liquid storage tank includes a tank body and a tank cover. The tank body is directly connected to the bottom end of the battery pack bracket. Both ends of the tank cover are connected to the left and right sides of the tank body and are provided with a plurality of small through holes. The hydrophilic fiber strips are slender and fluffy and can pass through the small through holes to contact the condensate in the tank body. Under the action of the tank cover, the battery pack bracket is not in direct contact with the condensate in the tank body. The liquid storage tank can be used for single or multiple single cells.

4. The composite battery thermal management system according to claim 1, characterized in that: The battery pack bracket fixes the single cell from the upper and lower ends, and large through holes are provided at the upper and lower ends of the central axis of the single cell for connecting the single cell in series / parallel. The battery pack bracket forms a channel with an inlet and an outlet to allow fluid to flow through. Small through holes are provided at the upper and lower ends of the battery pack bracket respectively. The small through holes and the small through holes of the liquid storage tank cover are located on the same axis and are of the same size. The hydrophilic fiber strips can pass through the small through holes at the upper and lower ends of the battery pack bracket, and the rivets can be installed and fixed on the protrusions at the upper end of the battery pack bracket.

5. The composite battery thermal management system according to claim 1, characterized in that: Through the rivet fixation and small through-hole fixation at the upper end of the battery pack bracket, the hydrophilic fiber strip will not produce a large displacement in the axial direction and the vertical axial direction, the hydrophilic fiber strip will not break due to the fixation of the rivet before and after absorbing water and wetting, the hydrophilic fiber strip will not break due to gravity problems and the action of the fan after saturation and wetting, the hydrophilic fiber strip can contact the condensed water of the liquid storage tank body and can make the condensed water wet the hydrophilic fiber strip under capillary action, the hydrophilic fiber strip can be squeezed and tightened, or a thin rope / steel wire can be inserted into the center of the hydrophilic fiber strip to make it not easy to break.

Images