CN110474119B - Lithium ion battery pack thermal management system and thermal management method thereof - Google Patents
Lithium ion battery pack thermal management system and thermal management method thereof Download PDFInfo
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- CN110474119B CN110474119B CN201910743376.4A CN201910743376A CN110474119B CN 110474119 B CN110474119 B CN 110474119B CN 201910743376 A CN201910743376 A CN 201910743376A CN 110474119 B CN110474119 B CN 110474119B
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 28
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 28
- 238000007726 management method Methods 0.000 title claims description 48
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 135
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 135
- 239000007788 liquid Substances 0.000 claims abstract description 120
- 230000017525 heat dissipation Effects 0.000 claims abstract description 97
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 26
- 238000010438 heat treatment Methods 0.000 claims abstract description 13
- 239000012530 fluid Substances 0.000 claims abstract description 10
- 238000001816 cooling Methods 0.000 claims description 26
- 239000000110 cooling liquid Substances 0.000 claims description 19
- 230000001276 controlling effect Effects 0.000 claims description 12
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 9
- 238000011217 control strategy Methods 0.000 claims description 7
- 238000005485 electric heating Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 238000013461 design Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 239000000565 sealant Substances 0.000 claims description 2
- 230000005855 radiation Effects 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 5
- 238000011161 development Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000012994 industrial processing Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/613—Cooling or keeping cold
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/63—Control systems
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/63—Control systems
- H01M10/637—Control systems characterised by the use of reversible temperature-sensitive devices, e.g. NTC, PTC or bimetal devices; characterised by control of the internal current flowing through the cells, e.g. by switching
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/655—Solid structures for heat exchange or heat conduction
- H01M10/6554—Rods or plates
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/655—Solid structures for heat exchange or heat conduction
- H01M10/6554—Rods or plates
- H01M10/6555—Rods or plates arranged between the cells
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Automation & Control Theory (AREA)
- Secondary Cells (AREA)
Abstract
The invention relates to a lithium ion battery pack thermal management system, which comprises a heat radiation aluminum plate, a heat radiation aluminum pipe, a controller, a water pump, a heating and refrigerating device and a temperature sensor, wherein the heat radiation aluminum pipe is arranged on the heat radiation aluminum plate; a group of battery packs are fixed between adjacent heat-dissipating aluminum plates, and one side of each heat-dissipating aluminum plate is provided with a plurality of mounting slots for positioning and placing the heat-dissipating aluminum tubes; the heat dissipation aluminum pipes are bent into an S shape, and one heat dissipation aluminum pipe is correspondingly arranged in the mounting slot holes of the plurality of heat dissipation aluminum plates at the same height; one end of the heat dissipation aluminum pipe is provided with a liquid inlet, and the other end of the heat dissipation aluminum pipe is provided with a liquid outlet; the number of the corresponding heat dissipation aluminum tubes on the outer side of the battery pack is smaller than that of the corresponding heat dissipation aluminum tubes on the inner side of the battery pack; the temperature sensors are respectively arranged on the surfaces of the batteries near the liquid inlet and the liquid outlet of the heat dissipation aluminum pipe, and feed back temperature signals to the controller; the controller adjusts the temperature of the fluid by driving the heating and refrigerating device, and conveys the fluid to each liquid inlet by driving the water pump. The invention can realize temperature control and effectively ensure the consistency of the temperature distribution of the battery pack.
Description
Technical Field
The invention relates to the technical field of battery pack thermal management, in particular to a thermal management system and a thermal management method of a battery pack of a pure electric vehicle.
Background
In recent years, with the rapid development of electric vehicles, the technology of a power battery as a core component of the electric vehicles has also been significantly advanced, and in order to ensure the normal operation of a battery pack, the temperature of the battery pack needs to be controlled. Particularly, in the environment of rapid development of the current fast-charging technology, the control of the temperature of the battery pack is more important. The inconsistent temperature distribution in the high temperature environment and the charge and discharge process for a long time can lead to the performance degradation of the battery pack, even thermal runaway, and cause smoke, fire, combustion and even explosion. It is therefore necessary to perform thermal management of the battery pack.
Most battery boxes of pure electric vehicles are placed at the bottom of the vehicle at present, and due to the limitation of space at the bottom of the electric vehicle and the structure of single batteries, after the batteries are connected in series and parallel in groups, the assembly and the connection occupy a considerable part of space, so that the thermal management design space of the battery pack is limited. Battery materials and fast charging technology are continuously developed, the capacity of a battery pack is continuously improved, the endurance mileage is increased, the conventional air cooling heat dissipation can not meet the heat dissipation and safety requirements, and the thermal management of the battery pack is gradually developed to liquid cooling heat dissipation. However, the existing liquid cooling mode is still relatively single, for example, the liquid flow direction in the liquid cooling pipeline is single, the liquid cooling mode is started only when the temperature reaches a set threshold value, and the thermal management of the battery pack in the liquid cooling mode is still in an attempt and development stage and is not applied on a large scale yet.
Disclosure of Invention
The invention aims to solve the technical problems of heat accumulation of a battery pack, inconsistent temperature distribution in a battery module and relatively single liquid cooling mode in the prior art, and provides a lithium ion battery pack thermal management system and a thermal management method thereof suitable for a pure electric vehicle, which can realize temperature control and effectively ensure consistency of temperature distribution of the battery pack.
The technical scheme adopted by the invention for solving the technical problems is as follows:
A lithium ion battery pack thermal management system comprises a lithium ion battery pack, a heat dissipation aluminum plate, a heat dissipation aluminum pipe, a controller, a water pump, a heating and refrigerating device and a temperature sensor; the heat dissipation aluminum plates are arranged in pairs, a group of battery packs is fixed between every two adjacent pairs of heat dissipation aluminum plates, a plurality of mutually parallel mounting slots are formed in one side of each heat dissipation aluminum plate, the mounting slots are used for positioning and placing the heat dissipation aluminum plates, and the battery packs are arranged on the surfaces of the heat dissipation aluminum plates; the heat dissipation aluminum pipes are bent into an S shape, and one heat dissipation aluminum pipe is correspondingly arranged in the mounting groove holes of the plurality of heat dissipation aluminum plates at the same height; one end of the heat dissipation aluminum pipe is provided with a liquid inlet, and the other end of the heat dissipation aluminum pipe is provided with a liquid outlet; the length of each S-shaped heat dissipation aluminum pipe is determined according to the length and the width of an actual battery pack, and the number of corresponding heat dissipation aluminum pipes on the outer side of the battery pack is smaller than that of corresponding heat dissipation aluminum pipes on the inner side of the battery pack according to a differential design principle; the plurality of temperature sensors are respectively arranged on the surfaces of the batteries near the liquid inlet and the liquid outlet of the heat dissipation aluminum pipe so as to monitor the temperatures of different positions of the battery pack and feed back temperature signals to the controller; the controller is respectively connected with the water pump and the heating and refrigerating device, the temperature of the fluid is regulated by driving the heating and refrigerating device, and the fluid is conveyed to each liquid inlet by driving the water pump, so that the fluid circularly flows.
In the scheme, the mounting slots on the heat dissipation aluminum plate are formed at equal intervals.
In the above scheme, the inlet and the liquid outlet of heat dissipation aluminum pipe all extend beyond outside the heat dissipation aluminum plate, the inlet and the liquid outlet of heat dissipation aluminum pipe respectively through standard connecting piece with the water pump is connected, for avoiding the weeping, the junction is sealed with sealing compound and pyrocondensation pipe.
In the above scheme, the lithium ion battery pack thermal management system further comprises an electromagnetic valve, each heat dissipation aluminum pipe corresponds to one electromagnetic valve, and on-off is controlled; the electromagnetic valve is connected with the controller, and the electromagnetic valve is controlled to adjust the number of the opened cooling pipelines by adopting an interval temperature control strategy according to the temperature rise of the battery pack.
In the above scheme, the battery pack is a square battery or a cylindrical battery.
In the above scheme, the heat dissipation aluminum pipe is a round pipe, a square pipe or a flat pipe, and the shape and the size of the installation slot hole on the heat dissipation aluminum plate are matched with the heat dissipation aluminum pipe.
In the scheme, the shell of the battery pack is covered with the insulating film; an electric heating film is paved in the battery box and used for preheating the battery pack.
In the above scheme, the cooling liquid in the lithium ion battery pack thermal management system is water or a mixture of water and ethylene glycol.
The invention also provides a thermal management method of the lithium ion battery pack thermal management system, which adopts an interval temperature control strategy and specifically comprises the following steps:
Step 1, setting the number of the heat-radiating aluminum pipes on two outer heat-radiating aluminum plates of the battery pack as N1, wherein the N1 heat-radiating aluminum pipes penetrate through all the heat-radiating aluminum plates of the battery pack and are called long pipes; the number of the heat dissipation aluminum pipes on each inner heat dissipation aluminum plate between the two outer heat dissipation aluminum plates is N2, N1 is smaller than N2, N3 = N2-N1, namely the N3 heat dissipation aluminum pipes penetrate through all the inner heat dissipation aluminum plates of the battery pack and are called short pipes; the method comprises the steps that N1 long pipes are arranged as a long pipe liquid inlet and a long pipe liquid outlet respectively, N3 short pipes are arranged as a short pipe liquid inlet and a short pipe liquid outlet respectively, and temperature sensors are respectively arranged on the surfaces of batteries attached to the long pipe liquid inlet, the long pipe liquid outlet, the short pipe liquid inlet and the short pipe liquid outlet, so that the temperature of the battery pack is collected in real time; if the temperature difference between the liquid inlet of the long pipe and the liquid outlet of the long pipe is less than 5 ℃ and the temperature difference between the liquid inlet of the short pipe and the liquid outlet of the short pipe is less than 5 ℃, the liquid belongs to a normal range; if the temperature difference is greater than 5 ℃ and the temperature difference continuously rises, the controller sends CAN information to the charger, charging is stopped, and an alarm is given;
Step 2, if the temperature difference is less than 5 ℃ and the temperature of the battery near the liquid outlet of the long pipe and the liquid outlet of the short pipe is less than 10 ℃, feeding information back to a Battery Management System (BMS) through a controller, and preheating the battery through an electric heating film at the bottom of the battery;
step 3, if the temperature difference is less than 5 ℃ and the temperature of the battery near the liquid outlet of the long pipe and the liquid outlet of the short pipe is more than 10 ℃ and less than 20 ℃, temporarily starting cooling; if the temperature difference is less than 5 ℃ and the temperature of the battery near the liquid outlet of the long pipe and the liquid outlet of the short pipe is more than 20 ℃ and less than 35 ℃, controlling the electromagnetic valve to open N1 long pipes, controlling the cooling liquid flow directions of the N1 long pipes to be crossed, adjusting the duty ratio of the water pump, controlling the flow rate of the cooling liquid, and cooling; if the temperature difference is less than 5 ℃ and the temperature of the battery near the liquid outlet of the long pipe and the liquid outlet of the short pipe is more than 35 ℃ and less than 55 ℃, controlling the electromagnetic valve to simultaneously open N1 long pipes and N3 short pipes, adjusting the duty ratio to control the flow rate of the cooling liquid, and cooling the cooling liquid of the N2 pipes to cross; if the temperature of the battery near the liquid outlet is higher than 55 ℃, stopping charging and giving an alarm.
The invention has the beneficial effects that:
1. The heat dissipation aluminum plate of the heat management system is provided with uniformly distributed mounting slots on one side for positioning and mounting the heat dissipation aluminum plate, and the other side is a plane and is tightly attached to the battery pack; the heat dissipation aluminum pipe is bent into an S shape, and the processing has certain flexibility and durability. The two heat dissipation aluminum plates are symmetrically arranged, the heat dissipation aluminum pipe is arranged in the middle, and the heat dissipation aluminum plate has great flexibility in the process of installing, overhauling and maintaining the battery pack. In addition, the combination of the structures of the heat dissipation aluminum plate and the heat dissipation aluminum pipe has large contact area and good heat transfer effect, and different numbers of heat dissipation aluminum pipes can be arranged at different positions of the battery pack according to the actual condition of the battery pack, so that the consistency of the temperature distribution of the battery pack is more effectively ensured.
2. The heat management system monitors the temperatures of different positions of the battery pack through the temperature sensor to obtain the temperature difference between the inside and the outside and the temperature rise, and then feeds the temperature difference back to the controller, the controller drives the water pump to adjust the flow rate of cooling liquid, and the controller drives the electromagnetic valve to adjust the number and the flow direction of the opened heat dissipation aluminum pipes, so that the cooling and the temperature balance control of the battery pack can be effectively realized.
3. The thermal management method adopts an interval temperature control strategy, and adjusts the quantity of circulating cooling pipelines, the flow velocity of cooling liquid and the flow direction of the cooling liquid according to the temperature of the battery pack during charging. Compared with the conventional heat management mode with fixed flow direction, fixed flow speed, fixed pipeline quantity and high processing cost, the heat management device has the advantages of realizing heating and cooling, balancing the whole temperature, and being less in pipeline interface and not easy to generate liquid leakage. Battery pack liquid cooling is a trend in future battery pack thermal management.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic diagram of the overall structure of a lithium ion battery thermal management system of the present invention;
FIG. 2 is a schematic diagram of a heat dissipating aluminum plate of the thermal management system of the lithium ion battery pack of FIG. 1;
FIG. 3 is a schematic diagram of a heat dissipating aluminum tube of the thermal management system of the lithium ion battery pack of FIG. 1;
FIG. 4 is a schematic diagram of an assembly of a heat dissipating aluminum plate and a heat dissipating aluminum tube;
Fig. 5 is a control flow diagram of a lithium ion battery thermal management system of the invention.
In the figure: 10. a battery pack; 20. a heat-dissipating aluminum plate; 21. a mounting slot; 30. a heat-dissipating aluminum pipe; 40. a controller; 50. a water pump; 60. a heating and refrigerating device; 71. a long tube liquid inlet; 72. a long tube liquid outlet; 81. a liquid inlet of the short pipe; 82. a liquid outlet of the short pipe.
Detailed Description
For a clearer understanding of technical features, objects and effects of the present invention, a detailed description of embodiments of the present invention will be made with reference to the accompanying drawings.
Referring to fig. 1, a thermal management system for a lithium ion battery pack according to an embodiment of the present invention includes a lithium ion battery pack 10, a heat-dissipating aluminum plate 20, a heat-dissipating aluminum tube 30, a controller 40, a water pump 50, a heating and cooling device 60, and a temperature sensor (not shown). The heat radiation aluminum plate 20 is manufactured by industrial processing, has good heat conduction performance, and has certain hardness. There are 5 heat dissipating aluminum plates 20, including 2 outside heat dissipating aluminum plates 20 on both sides and 3 inside heat dissipating aluminum plates between them. The 5 heat-dissipating aluminum plates 20 are placed in pairs, and a group of battery packs 10 is fixed between each adjacent pair of heat-dissipating aluminum plates 20. As shown in fig. 2, one side of the heat-dissipating aluminum plate 20 is provided with 5 mounting slots 21 parallel to each other, the mounting slots 21 are used for positioning and placing the heat-dissipating aluminum tube 30, and the battery pack 10 is disposed on the surface of the heat-dissipating aluminum plate 20. As shown in fig. 3 to 4, the heat-dissipating aluminum tubes 30 are bent into an S shape, and one heat-dissipating aluminum tube 30 is correspondingly installed in the installation slot 21 of the plurality of heat-dissipating aluminum plates 20 at the same height; one end of the heat dissipation aluminum tube 30 is a liquid inlet, and the other end is a liquid outlet. Specifically, the total number of the heat dissipation aluminum tubes 30 is 5, and the heat dissipation aluminum tubes comprise 3 long tubes in the middle and 1 short tube respectively positioned at the upper side and the lower side of the 3 long tubes, the 3 long tubes penetrate through the 5 heat dissipation aluminum plates 20 of the battery pack 10, and the two ends of the 3 long tubes are respectively provided with a long tube liquid inlet 71 and a long tube liquid outlet 72; the 2 short tubes penetrate through the 3 inner side heat dissipation aluminum plates 20 of the battery pack 10, and the two ends of the short tube penetrate through the liquid inlet 81 and the liquid outlet 82 of the short tube respectively. The number of the temperature sensors is 4, and the temperature sensors are respectively fixed on the surfaces of the batteries near the liquid inlet and the liquid outlet of the heat dissipation aluminum pipe 30 through heat conduction glue so as to monitor the temperatures of different positions of the battery pack 10 and feed back temperature signals to the controller 40. The controller 40 is respectively connected with the water pump 50 and the heating and refrigerating device 60, the controller 40 makes a judgment according to the collected information, the heating and refrigerating device 60 is driven to adjust the temperature of the fluid, and the water pump 50 is driven to convey the fluid to each liquid inlet, so that the fluid circularly flows.
Further preferably, in this embodiment, the mounting slots 21 on the heat dissipating aluminum plate 20 are formed at equal intervals.
Further preferably, in this embodiment, the liquid inlet and the liquid outlet of the heat dissipation aluminum tube 30 extend beyond the heat dissipation aluminum plate 20, the liquid inlet and the liquid outlet of the heat dissipation aluminum tube 30 are connected with the water pump 50 through standard connectors respectively, and in order to avoid liquid leakage, the joint is sealed by sealant and heat shrinkage tube.
Further preferably, in this embodiment, the thermal management system of the lithium ion battery pack 10 further includes an electromagnetic valve (not shown), and each heat dissipation aluminum tube 30 corresponds to one electromagnetic valve to control on/off; the solenoid valve is connected with the controller 40, and the solenoid valve is controlled to adjust the number of the opened cooling pipelines according to the temperature rise of the battery pack 10 by adopting an interval temperature control strategy, so that the balance of the whole temperature is achieved.
Further optimized, in this embodiment, the controller 40 can adjust the on-off state of the cooling liquid in the heat dissipation aluminum tube 30 by driving the electromagnetic valve, and the cross flow is formed by matching with different liquid inlets connected by the water pump, so that the uniformity of the cross flow temperature distribution is better, and the temperature difference of the battery pack is smaller.
Further preferably, in this embodiment, the battery pack 10 is a prismatic battery or a cylindrical battery.
Further preferably, in this embodiment, the heat dissipation aluminum tube 30 is a round tube, a square tube or a flat tube, and the shape and the size of the mounting slot 21 on the heat dissipation aluminum plate 20 are adapted to the heat dissipation aluminum tube 30.
Further preferably, in the present embodiment, the casing of the battery pack 10 is covered with an insulating film; an electric heating film is laid in the battery box for preheating the battery pack 10.
Further preferably, in this embodiment, the cooling liquid in the thermal management system of the lithium ion battery pack 10 is water or a mixture of water and ethylene glycol.
As shown in fig. 5, the thermal management method of the thermal management system of the lithium ion battery pack adopts an interval temperature control strategy, and specifically includes the following steps:
Step 1, respectively installing a temperature sensor on the surfaces of batteries near the long pipe liquid inlet 71, the long pipe liquid outlet 72, the short pipe liquid inlet 81 and the short pipe liquid outlet 82, and collecting the temperature of the battery pack 10 in real time; if the temperature difference between the long tube liquid inlet 71 and the long tube liquid outlet 72 is less than 5 ℃, and the temperature difference between the short tube liquid inlet 81 and the short tube liquid outlet 82 is less than 5 ℃, the temperature difference is in the normal range; if the temperature difference is greater than 5 ℃ and the temperature difference continuously rises, the controller 40 sends CAN information to the charger, charging is stopped, and an alarm is given;
Step 2, if the temperature difference is less than 5 ℃ and the temperature of the battery near the long pipe liquid outlet 72 and the short pipe liquid outlet 82 is less than 10 ℃, feeding back information to a Battery Management System (BMS) through the controller 40, and preheating the battery through an electric heating film at the bottom of the battery;
Step 3, if the temperature difference is less than 5 ℃ and the battery temperature near the long pipe liquid outlet 72 and the short pipe liquid outlet 82 is more than 10 ℃ and less than 20 ℃, temporarily starting cooling; if the temperature difference is less than 5 ℃ and the temperature of the battery near the long pipe liquid outlet 72 and the short pipe liquid outlet 82 is greater than 20 ℃ and less than 35 ℃, controlling the electromagnetic valve to open the middle 3 long pipes, controlling the cooling liquid directions of the 3 long pipes to be crossed, adjusting the duty ratio of the water pump 50, controlling the flow rate of the cooling liquid, and cooling; if the temperature difference is less than 5 ℃ and the temperature of the battery near the liquid outlet 72 of the long pipe and the liquid outlet 82 of the short pipe is more than 35 ℃ and less than 55 ℃, controlling the electromagnetic valve to simultaneously open 5 pipelines, adjusting the duty ratio to control the flow rate of the cooling liquid, and cooling the cooling liquid of the 5 pipelines to cross; if the temperature of the battery near the liquid outlet is higher than 55 ℃, stopping charging and giving an alarm.
The above is only one embodiment of the present invention, and the number of cooling pipes is flexibly variable. The liquid cooling mode of the battery pack is not only limited to cylindrical batteries, but also can be applied to heat dissipation of square batteries and soft package batteries.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
The embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those having ordinary skill in the art without departing from the spirit of the present invention and the scope of the claims, which are to be protected by the present invention.
Claims (8)
1. The lithium ion battery pack thermal management system comprises a lithium ion battery pack and is characterized by further comprising a heat dissipation aluminum plate, a heat dissipation aluminum pipe, a controller, a water pump, a heating and refrigerating device and a temperature sensor; the heat dissipation aluminum plates are arranged in pairs, a group of battery packs is fixed between every two adjacent pairs of heat dissipation aluminum plates, a plurality of mutually parallel mounting slots are formed in one side of each heat dissipation aluminum plate, the mounting slots are used for positioning and placing the heat dissipation aluminum plates, and the battery packs are arranged on the surfaces of the heat dissipation aluminum plates; the heat dissipation aluminum pipes are bent into an S shape, and one heat dissipation aluminum pipe is correspondingly arranged in the mounting groove holes of the plurality of heat dissipation aluminum plates at the same height; one end of the heat dissipation aluminum pipe is provided with a liquid inlet, and the other end of the heat dissipation aluminum pipe is provided with a liquid outlet; the length of each S-shaped heat dissipation aluminum pipe is determined according to the length and the width of an actual battery pack, and the number of corresponding heat dissipation aluminum pipes on the outer side of the battery pack is smaller than that of corresponding heat dissipation aluminum pipes on the inner side of the battery pack according to a differential design principle; the plurality of temperature sensors are respectively arranged on the surfaces of the batteries near the liquid inlet and the liquid outlet of the heat dissipation aluminum pipe so as to monitor the temperatures of different positions of the battery pack and feed back temperature signals to the controller; the number of the radiating aluminum pipes on the two outer radiating aluminum plates of the battery pack is N1, and the N1 radiating aluminum pipes penetrate through all the radiating aluminum plates of the battery pack and are called long pipes; the number of the heat dissipation aluminum pipes on each inner heat dissipation aluminum plate between the two outer heat dissipation aluminum plates is N2, N1 is smaller than N2, N3 = N2-N1, namely the N3 heat dissipation aluminum pipes penetrate through all the inner heat dissipation aluminum plates of the battery pack and are called short pipes; the method comprises the steps that N1 long pipes are arranged as a long pipe liquid inlet and a long pipe liquid outlet respectively, N3 short pipes are arranged as a short pipe liquid inlet and a short pipe liquid outlet respectively, and temperature sensors are respectively arranged on the surfaces of batteries attached to the long pipe liquid inlet, the long pipe liquid outlet, the short pipe liquid inlet and the short pipe liquid outlet, so that the temperature of the battery pack is collected in real time; the controller is respectively connected with the water pump and the heating and refrigerating device, the temperature of the fluid is regulated by driving the heating and refrigerating device, and the fluid is conveyed to each liquid inlet by driving the water pump so as to circularly flow; the lithium ion battery pack thermal management system further comprises electromagnetic valves, each radiating aluminum pipe corresponds to one electromagnetic valve, and on-off is controlled; the electromagnetic valve is connected with the controller, and the electromagnetic valve is controlled to adjust the number of the opened cooling pipelines by adopting an interval temperature control strategy according to the temperature rise of the battery pack.
2. The thermal management system of a lithium ion battery pack according to claim 1, wherein the mounting slots on the heat dissipating aluminum plate are provided at equal intervals.
3. The thermal management system of claim 1, wherein the liquid inlet and the liquid outlet of the heat dissipation aluminum pipe extend beyond the heat dissipation aluminum plate, and the liquid inlet and the liquid outlet of the heat dissipation aluminum pipe are respectively connected with the water pump through standard connectors, and the joint is sealed by sealant and heat shrinkage pipes for avoiding liquid leakage.
4. The lithium ion battery pack thermal management system of claim 1, wherein the battery pack is a prismatic battery or a cylindrical battery.
5. The lithium ion battery pack thermal management system according to claim 1, wherein the heat dissipation aluminum pipe is a round pipe, a square pipe or a flat pipe, and the shape and the size of the mounting slot hole on the heat dissipation aluminum pipe are matched with the heat dissipation aluminum pipe.
6. The lithium ion battery pack thermal management system of claim 1, wherein the battery pack housing is wrapped with an insulating film; an electric heating film is paved in the battery box and used for preheating the battery pack.
7. The lithium ion battery pack thermal management system of claim 1, wherein the cooling liquid in the lithium ion battery pack thermal management system is water or a mixture of water and ethylene glycol.
8. The method for thermal management of a lithium ion battery pack thermal management system of claim 1, wherein the thermal management method employs an interval temperature control strategy, comprising the steps of:
Step 1, setting the number of the heat-radiating aluminum pipes on two outer heat-radiating aluminum plates of the battery pack as N1, wherein the N1 heat-radiating aluminum pipes penetrate through all the heat-radiating aluminum plates of the battery pack and are called long pipes; the number of the heat dissipation aluminum pipes on each inner heat dissipation aluminum plate between the two outer heat dissipation aluminum plates is N2, N1 is smaller than N2, N3 = N2-N1, namely the N3 heat dissipation aluminum pipes penetrate through all the inner heat dissipation aluminum plates of the battery pack and are called short pipes; the method comprises the steps that N1 long pipes are arranged as a long pipe liquid inlet and a long pipe liquid outlet respectively, N3 short pipes are arranged as a short pipe liquid inlet and a short pipe liquid outlet respectively, and temperature sensors are respectively arranged on the surfaces of batteries attached to the long pipe liquid inlet, the long pipe liquid outlet, the short pipe liquid inlet and the short pipe liquid outlet, so that the temperature of the battery pack is collected in real time; if the temperature difference between the liquid inlet of the long pipe and the liquid outlet of the long pipe is less than 5 ℃ and the temperature difference between the liquid inlet of the short pipe and the liquid outlet of the short pipe is less than 5 ℃, the liquid belongs to a normal range; if the temperature difference is greater than 5 ℃ and the temperature difference continuously rises, the controller sends CAN information to the charger, charging is stopped, and an alarm is given;
Step 2, if the temperature difference is less than 5 ℃ and the temperature of the battery near the liquid outlet of the long pipe and the liquid outlet of the short pipe is less than 10 ℃, feeding information back to a Battery Management System (BMS) through a controller, and preheating the battery through an electric heating film at the bottom of the battery;
Step 3, if the temperature difference is less than 5 ℃ and the temperature of the battery near the liquid outlet of the long pipe and the liquid outlet of the short pipe is more than 10 ℃ and less than 20 ℃, temporarily starting cooling; if the temperature difference is less than 5 ℃ and the temperature of the battery near the liquid outlet of the long pipe and the liquid outlet of the short pipe is more than 20 ℃ and less than 35 ℃, controlling the electromagnetic valve to open N1 long pipes, controlling the cooling liquid flow directions of the N1 long pipes to be crossed, adjusting the duty ratio of the water pump, controlling the flow rate of the cooling liquid, and cooling; if the temperature difference is less than 5 ℃ and the temperature of the battery near the liquid outlet of the long pipe and the liquid outlet of the short pipe is more than 35 ℃ and less than 55 ℃, controlling the electromagnetic valve to simultaneously open N1 long pipes and N3 short pipes, adjusting the duty ratio to control the flow rate of the cooling liquid, and cooling the cooling liquid of the N2 pipes to cross; if the temperature of the battery near the liquid outlet is higher than 55 ℃, stopping charging and giving an alarm.
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| CN111211377B (en) * | 2020-01-15 | 2021-06-01 | 天能帅福得能源股份有限公司 | System and method for monitoring temperature of cylindrical lithium ion battery |
| CN112883638B (en) * | 2021-02-02 | 2022-08-09 | 同济大学 | Online estimation method for temperature distribution of super capacitor module |
| CN113437388A (en) * | 2021-06-08 | 2021-09-24 | 江苏和网源电气有限公司 | Heat management system for field multisource power supply battery |
| CN113659229B (en) * | 2021-07-02 | 2023-01-31 | 上海轶源动力科技有限公司 | Battery module heat radiation structure for electric vehicle |
| CN115692901A (en) * | 2022-09-07 | 2023-02-03 | 嘉兴方晟电子科技有限公司 | Power battery constant temperature control system, control method and temperature control device |
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