CN109599640B - Liquid heat management scheme for cylindrical power battery module - Google Patents
Liquid heat management scheme for cylindrical power battery module Download PDFInfo
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- CN109599640B CN109599640B CN201811470246.XA CN201811470246A CN109599640B CN 109599640 B CN109599640 B CN 109599640B CN 201811470246 A CN201811470246 A CN 201811470246A CN 109599640 B CN109599640 B CN 109599640B
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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
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/613—Cooling or keeping cold
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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
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/615—Heating or keeping warm
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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
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/617—Types of temperature control for achieving uniformity or desired distribution of temperature
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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
- H01M10/60—Heating or cooling; Temperature control
- H01M10/64—Heating or cooling; Temperature control characterised by the shape of the cells
- H01M10/643—Cylindrical cells
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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
- H01M10/60—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
- H01M10/6556—Solid parts with flow channel passages or pipes for heat exchange
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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
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
- H01M10/6567—Liquids
- H01M10/6568—Liquids characterised by flow circuits, e.g. loops, located externally to the cells or cell casings
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- 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
Abstract
The invention discloses a liquid heat management scheme for a cylindrical power battery module, belonging to the technical field of power battery heat management, wherein a cylindrical battery is positioned in the hollow interior of a cylindrical shell; a spiral coil is arranged on the outer side of the cylindrical shell; the spiral coil is wound on the cylindrical shell by different branch coils; the inlet and the outlet of each branch coil pipe are arranged in a staggered manner; the inlet and outlet of each branch coil pipe are designed symmetrically or asymmetrically, and each branch coil pipe in the spiral coil pipe is respectively connected with a manifold for leading in the refrigerant and the heat medium and a manifold for leading out the refrigerant and the heat medium through a hose connecting pipe and then connected with a cooling system and a heating system of the battery module; adopt serpentine coil winding on the cylindrical casing of battery, the battery is arranged in the heat transfer mode of casing, introduces the manifold and provides refrigerant, heat medium for each battery simultaneously to this reduces the temperature rise between the battery in the battery module, improves the temperature uniformity between the battery.
Description
Technical Field
The invention relates to the technical field of power battery heat management, in particular to a cylindrical power battery module liquid heat management scheme.
Background
The lithium ion battery is a recyclable new energy source with the most development prospect at present, is a hotspot of research in academic circles and industrial circles, and is widely applied to the fields of pure electric vehicles, hybrid electric vehicles, portable electronic equipment and the like. However, lithium ion batteries are very sensitive to temperature, 20-40 ℃ is a suitable working temperature range, too low temperature can cause the diffusion rate of lithium ions at the interface of an anode and an electrolyte to be slow and the polarization resistance to be high, and too high temperature can cause the SEI film at the interface of the anode and the electrolyte to be degraded, thereby causing the capacity and power of the batteries to be greatly reduced. In addition, the lithium ion battery generates a large amount of heat during high-temperature high-rate discharge, which in turn accelerates chemical reactions of the lithium ion battery, further causing overheating of the battery, and if any, may cause fire or explosion. Therefore, thermal management is not only important for lithium ion battery performance, but also for its safety. Generally, the optimum operating temperature range of lithium ion batteries is 20-40 ℃, with a temperature difference within 5 ℃.
The purpose of battery thermal management is to enable the temperature of the batteries to be within an optimal temperature range, and simultaneously improve the temperature consistency among the batteries, and different thermal management methods comprise air thermal management, liquid thermal management, phase-change material thermal management, heat pipe thermal management and the like. In general, liquid thermal management is gaining increasing attention due to its high thermal conductivity. The square battery usually adopts a liquid cooling plate, liquid is not circulated in the liquid cooling plate or one end of the liquid cooling plate is imported, and the other end of the liquid cooling plate is circulated, while the cylindrical battery usually adopts a snakelike flat tube, the flat tube is close to the battery, and the heating medium or the cooling medium enters from one end and exits from the other end. The flow of the refrigerant or the heat medium is long, and the temperature of the battery can generate large temperature difference along with the flow as the heat exchange temperature of the fluid is increased or reduced in the flowing process.
Disclosure of Invention
The invention aims at the problems in the prior art and discloses a liquid heat management scheme for a cylindrical power battery module.
The invention is realized by the following steps:
a liquid heat management scheme for a cylindrical power battery module comprises a cylindrical battery, wherein the cylindrical battery is positioned in the hollow interior of a cylindrical shell; a spiral coil is arranged on the outer side of the cylindrical shell; the spiral coil is wound on the cylindrical shell by different branch coils; adopt serpentine coil winding on cylindrical shell, cylindrical battery is arranged in the heat transfer mode of cylindrical shell, introduces the manifold and provides refrigerant, heat medium for each battery simultaneously to this reduces the temperature rise between the battery in the battery module, improves the temperature uniformity between the cylindrical battery. The inlet and the outlet of each branch coil pipe are arranged in a staggered manner; the inlet and outlet of each branch coil pipe adopt a symmetrical or asymmetrical design, namely all the inlets or outlets are positioned at the positive end or the negative end of the cylindrical battery at the same time; or the inlet (outlet) of one part of the branch coil pipe in the spiral coil pipe is positioned at the positive end of the cylindrical battery, and the inlet (outlet) of the other part of the branch coil pipe is positioned at the negative end of the cylindrical battery; the inlet and outlet branches of each coil can adopt an asymmetric design, so that the phenomenon that the temperature distribution of a single battery is inconsistent along the axial direction can be solved, and particularly, the temperature difference between the positive end and the negative end of the battery is large under the condition of high-rate charging and discharging (under the condition of high-rate discharging, the temperature difference can reach more than 5 ℃).
Each branch coil pipe in the spiral coil pipes is respectively connected with a manifold for leading in a refrigerant and a heat medium and a manifold for leading out the refrigerant and the heat medium through a hose connecting pipe; and the manifold for introducing the refrigerant and the heat medium, the manifold for leading out the refrigerant and the heat medium are connected with the cooling system and the heating system of the battery module. Spiral coil one end on the casing is the import of refrigerant, heat medium, and the other end is the export of refrigerant, heat medium, and spiral coil can have a plurality of branches, can avoid refrigerant, heat medium flow overlength like this, increases the drawback of battery difference in temperature.
The battery pack is internally provided with a temperature sensor, and the cooling and heating system can receive a control temperature signal. When the temperature is higher than the set value, the system works and is introduced with a refrigerant medium, and when the temperature is lower than the set value, the system works and is introduced with a heat medium.
Further, cylindrical shell and cylindrical battery between adopt clearance fit, adopt interference fit to assemble between clearance packing heat conduction material or cylindrical shell and the cylindrical battery.
Furthermore, the cylindrical batteries are provided with a plurality of cylindrical batteries which are arranged in rows and columns to form a battery module.
Furthermore, the spiral coil pipes are adjacent or not adjacent, and the temperature difference between the anode and the cathode of the battery can be improved and reduced by adopting a mode that the spiral coil pipes are not adjacent, for example, 3 coil pipes are adopted, 2 inlets are fed from the top, and 1 inlet is fed from the bottom. By adopting the mode that 5 coil pipes, 3 inlets are fed from the top and 2 inlets are fed from the bottom, the temperature of the battery can be further reduced, and the temperature difference between the anode and the cathode is reduced.
Furthermore, the spiral coil arrangement adopts a fluid backflow flowing mode, the coil pipes with the semicircular sections are separated by the partition plates, and fluid media enter one cavity, flow through the other end, flow around and flow back and exit from the other cavity. The specific heat exchange process is as follows: the cooling medium and the heat medium from the cooling system and the heating system are distributed to the manifold for leading in the cooling medium and the heat medium through the manifold, heat exchange is carried out through the spiral coil and the cylindrical battery, and the heat exchanged cooling medium or heat medium manifold is collected to the manifold for leading out the cooling medium and the heat medium. When the temperature of the cylindrical power battery is too high, the cold medium from the cooling system is distributed into the coil pipe through the manifold for introducing the cold medium and the heat medium, and after the heat exchange is carried out on the cold medium through the coil pipe and the battery, the cold medium is collected to the manifold for leading out the cold medium and the heat medium and returns to the cooling system. When the temperature of the cylindrical power battery is too low, the heat medium from the heating system is distributed into the coil pipe through the manifold for introducing the refrigerant and the heat medium, and after the heat medium exchanges heat with the battery through the coil pipe, the heat medium is collected to the manifold for introducing the refrigerant and the heat medium and returns to the heating system.
Furthermore, the section of the coil pipe is similar to a semicircular section or a rectangular section.
Furthermore, the manifold for introducing the refrigerant and the heat medium, and the manifold for leading out the refrigerant and the heat medium are positioned in the gaps among the plurality of cylindrical batteries, so that the space occupancy rate of the heat management assembly can be reduced. And airtight and waterproof sealing rings are arranged at the connecting joints of the manifold for introducing the refrigerant and the heat medium, the connecting joints of the manifold for leading out the refrigerant and the heat medium and the cooling system and the heating system of the battery module and the connecting joints of the spiral coil.
Further, the cylindrical battery includes, but is not limited to, 18650, 26650 cylindrical lithium battery.
The cylindrical shell for placing the cylindrical battery can be integrally formed or connected into a whole in other modes, so that the assembly complexity can be reduced, and in addition, the cylindrical shell can be made of materials with good heat conductivity coefficients and small density so as to improve the heat exchange efficiency and reduce the weight of the heat management system. The cell and the cylindrical housing are assembled using a small clearance fit filled with a thermally conductive material or a small interference fit.
The beneficial effects of the invention and the prior art are as follows:
1) the invention arranges a plurality of spiral coils on the outer side of the cylindrical shell, wherein the coils are internally flowed with refrigerant and heating medium, each spiral coil is collected to a manifold by a connecting pipe, and the manifold is positioned in a gap between batteries and is connected with a cooling/heating system. When the temperature of the battery is too high, the coolant in the spiral coil circularly flows to reduce the temperature of the battery, and when the temperature of the battery is too low, the coolant in the spiral coil circularly flows to increase the temperature of the battery so as to control the temperature of the battery within a proper temperature range;
2) in the heat management scheme of the invention, because the refrigerant and the heat medium only exist in the spiral coil, the weight occupied by the fluid medium is correspondingly reduced compared with the sandwich type liquid cooling heat management scheme; in addition, the introduction of the manifold can also disperse inlets of cold and hot fluids, so that the defects of one inlet, one outlet, too long fluid flow and increased temperature difference in the fluid flowing process are avoided, and the space occupied by a thermal management system can also be reduced due to the manifold positioned between the batteries;
3) compared with the existing heat dissipation method of the cylindrical battery, the heat management scheme of the invention has the advantages that when the fluid in the coil pipe flows in a whirling manner, the fluid inlet and outlet flows are adjacent, heat conduction is realized between the fluid inlet and outlet flows, and the temperature of the fluid in the flows is basically kept consistent, so that the temperature difference inconsistency caused by the flows in the flowing process of the fluid can be eliminated.
Drawings
FIG. 1 is a schematic illustration of a plurality of branch coils of the present invention with a simulated temperature rise;
FIG. 2 is a schematic diagram and a simulation temperature rise diagram of the present invention in which the inlet and outlet of the coil are respectively located at the upper and lower ends;
FIG. 3 is a schematic diagram and a simulation temperature rise diagram of the present invention in which different numbers of inlets and outlets of the coil pipe are respectively located at the upper and lower ends;
FIG. 4 is a schematic diagram of a cylindrical power battery module thermal management method according to the present invention;
FIG. 5 illustrates a semi-circular interface coil arrangement with a convoluted flow pattern;
FIG. 6 illustrates a rectangular interface coil arrangement with a convoluted flow pattern;
FIG. 7 is a schematic diagram of a battery thermal management temperature control system;
FIG. 8 is a graph of a plurality of branch coil temperature profiles for different settings;
FIG. 9 is a temperature distribution diagram of the inlet and outlet of the coil at the upper and lower ends, respectively;
FIG. 10 is a temperature distribution diagram of different numbers of inlets and outlets of the coil pipes respectively located at the upper and lower ends;
the battery comprises a cylindrical shell 1, a manifold for introducing a refrigerant and a heat medium 2, a hose connecting pipe 3, a spiral coil 4, a manifold for leading out a refrigerant and a heat medium 5, a battery module 6 and a cylindrical battery 7.
Detailed Description
In order to make the objects, technical solutions and effects of the present invention more clear, the present invention is further described in detail by the following examples. It should be noted that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1 (a), the cylindrical battery 7 is located inside the hollow of the cylindrical case 1; a spiral coil (4) is arranged on the outer side of the cylindrical shell (1); as shown in fig. 1 (b), the spiral coil 4 is wound on the cylindrical housing 1 by different branch coils, wherein the spiral coil is wound on the cylindrical housing by different branches, for example, 3, 4, 5, etc., each spiral coil may be adjacent or non-adjacent, the cylindrical battery is located in the hollow cylindrical housing, the inlet and outlet of the spiral coil may be located at the upper and lower sides of the battery respectively or located at the upper and lower sides separately, as shown in fig. 2 to 3, fig. 2 (a) is a schematic diagram of the inlet and outlet of the coil being located at the upper and lower ends respectively, and fig. 3 (a) is a schematic diagram of the inlet and outlet of the coil in different numbers being located at the upper and lower ends respectively.
As shown in fig. 4, a plurality of cylindrical batteries 7 are arranged, and the plurality of cylindrical batteries 7 are arranged in rows and columns to form a battery module 6, wherein 4 (a) is a layout diagram of two branch coils; 4 (b) shows a layout of three branch coils; 4 (d) shows a layout of four branch coils; 4 (e) shows a layout of five branching coils. The inlet and the outlet of the spiral coil 4 are respectively connected with a manifold, the manifold is divided into a manifold 2 for leading in the refrigerant and the heat medium and a manifold 5 for leading out the refrigerant and the heat medium, and the manifold is connected with a cooling system and a heating system of the battery module. The cooling medium and the heat medium from the cooling system and the heating system are distributed to the manifold for leading in the cooling medium and the heat medium through the manifold, heat exchange is carried out through the spiral coil 4 and the battery, and the heat exchanged cooling medium or heat medium manifold is collected to the manifold for leading out the cooling medium and the heat medium.
As shown in fig. 7, the temperature range for thermal management is set to (a, b), and the temperature detected by the temperature sensor is received. When the temperature of the cylindrical power battery is too high, namely the temperature is higher than a, the cooling system works, the cold medium from the cooling system is distributed into the coil pipe through the manifold for leading in the refrigerant and the heat medium, and after the cold medium exchanges heat with the battery through the coil pipe, the cold medium is collected to the manifold for leading out the refrigerant and the heat medium and returns to the cooling system. When the temperature of the cylindrical power battery is too low, namely the temperature is less than b, the heating system works, the heat medium from the heating system is shunted into the coil pipe through the manifold for leading in the refrigerant and the heat medium, after the heat medium exchanges heat with the battery through the coil pipe, the heat medium is collected to the manifold for leading out the refrigerant and the heat medium and returns to the heating system.
As shown in figure 5, the spiral coil 4 is arranged in a fluid backflow mode, the middle of the coil with the semicircular section is separated by a partition plate, and fluid media enter one cavity, flow through the other end, flow around and flow back and exit from the other cavity. FIG. 5 (a) is a schematic view of a semi-circular cross-section coil convoluted flow mode coil arrangement; FIG. 5 (b) is a schematic view of the upper inlet and outlet of the battery; fig. 5 (c) is a schematic view showing the swirling flow in the lower part of the cell, and fig. 5(d) is a schematic view showing the bottom of the cell.
The section of the coil pipe is similar to a semicircular section and a rectangular section. A convoluted flow rectangular cross-section coil arrangement is shown in figure 6. FIG. 6 (a) shows a rectangular cross-section coil convoluted flow mode coil arrangement; 6(b) is a schematic diagram of the inlet and outlet at the upper part of the battery; 6(c) is a schematic view showing the swirling flow in the lower part of the cell; FIG. 6(d) is a schematic bottom view.
The invention can control the temperature rise of the battery module within a reasonable temperature range and reduce the temperature difference between batteries by combining a specific simulation temperature diagram. The method comprises the following specific steps:
when the temperature of the cylindrical battery 7 is over-high or over-low, a refrigerant or a heat medium from a cooling system or a heating system enters a manifold, the refrigerant or the heat medium flows through the manifold, then is shunted to flow through each hose connecting pipe 3, then flows into each branch coil of the spiral coil at the upper end of the shell and the battery with over-high or over-low temperature rise to exchange heat, then flows through each hose connecting pipe 3 from each outlet at the lower end of each branch coil, enters the manifold, namely a manifold 2 for introducing the refrigerant and the heat medium and a manifold 5 for leading out the refrigerant and the heat medium, and returns to the cooling system or the heating system after being converged.
Example 1
The arrangement of the spiral coils 4 on the cylindrical shell 1 is as shown in fig. 1, when the temperature of the battery is lower than the reasonable temperature range, the heat medium enters from the upper part of each branch coil, and the heat medium exchanges heat with the battery in the flowing process and then flows out from the lower part of each branch coil. When the temperature of the battery is higher than a reasonable temperature range, the refrigerant medium enters from the upper part of each branch coil pipe, and flows out from the lower part of each branch coil pipe after exchanging heat with the cylindrical battery 7 in the flowing process.
When the battery is at 5C discharge rate, the inlet refrigerant medium is water, the inlet temperature is 298.15K, and the inlet mass flow is 1 × 10-5In kg/s, the temperature rise curves of the batteries (2, 3, 4 and 5) under different numbers of branch coils are shown in fig. 1 (c), and it can be seen that the temperature rise and the temperature difference of the batteries can be effectively reduced by increasing the number of the branch coils.
8 (a) is a simulated temperature diagram provided with two branch coils, which is shown in simulated temperature diagrams 8 (a) to 8 (d); 8 (b) is a simulated temperature diagram of the three branch coils; 8 (c) is a simulated temperature diagram of the four branch coils; and 8 (d) is a simulation temperature diagram of the five branch coils, and the simulation temperature diagram can show that the maximum temperature of the battery can be effectively reduced and the temperature difference of the battery can be controlled by increasing the branch number of the coils. Meanwhile, the inlet position of each branch coil pipe greatly influences the distribution of the temperature of the battery, and when the branch coil pipes are close to the positive electrode part, the temperature of the upper end of the battery is obviously lower than that of the lower end of the battery.
Example 2
According to the arrangement mode of the coils on the shell, as shown in fig. 2, in the process of the flow, the temperature of the fluid is increased or decreased due to heat exchange with the battery, and the inlets and the outlets of the coils are arranged in a staggered mode, so that the temperature difference of the fluid medium in different flows can be offset to cause the temperature inconsistency of different positions of a single battery for the same transverse cross section position of the battery.
When the battery is at 5C discharge rate, the inlet refrigerant medium is water, the inlet temperature is 298.15K, and the inlet mass flow is set to 5 multiplied by 10-5In kg/s, the temperature rise curves of the batteries under different numbers of branch coil pipes are shown in fig. 2 (b), and it can be seen that the temperature rise of the batteries can be effectively reduced and the temperature difference can be controlled within 5K by adopting the mode of staggered arrangement of the inlet and the outlet of the coil pipes.
FIG. 9 is a temperature profile of the coil inlet and outlet at the upper and lower ends, respectively; FIG. 9 (a) is a temperature distribution diagram of two coils with their inlets and outlets at the upper and lower ends, respectively; FIG. 9 (b) is a graph showing the temperature distribution of the inlet and outlet of four coils at the upper and lower ends, respectively; as can be seen from the simulation temperature diagram, the phenomenon of uneven battery temperature distribution when only one end enters and the other end exits can be effectively changed by adopting the mode of staggered arrangement of the inlet and the outlet. When the number of the coils is 4, the temperature distribution uniformity is better.
Example 3
The coil arrangement on the cylindrical shell 1 is as shown in fig. 3, and takes into account the phenomenon that the temperature distribution of a single battery along the axial direction is inconsistent, especially the phenomenon that the temperature difference between the positive electrode end and the negative electrode end of the battery is large (the temperature difference can reach more than 5 ℃ under the condition of large-rate discharge) under the condition of large-rate charge and discharge. The inlet and outlet branches of each coil can adopt asymmetric design. For example, if there are 3 coils, the number of inlets of the positive-end coil may be set to 2, and the number of inlets of the negative-end coil may be set to 1. When there are 5 coils, the number of inlets of the coil at the positive end can be set to 3 or 4, and the number of inlets of the coil at the negative end can be set to 2 or 1. Fig. 10 shows the temperature distribution diagram of different numbers of inlets and outlets of the coil pipes respectively positioned at the upper end and the lower end. Fig. 10 (a) shows a temperature distribution diagram in which the number of inlets of the positive-end coil is set to 2 and the number of inlets of the negative-end coil is set to 1, for 3 coils; fig. 10 (b) shows a temperature distribution diagram in which the number of inlets of the positive-end coil is set to 3 and the number of inlets of the negative-end coil is set to 2, when there are 5 coils.
When the battery is at 5C discharge rate, the inlet refrigerant medium is water, the inlet temperature is 298.15K, and the inlet mass flow is set to 5 multiplied by 10-5kg/s. The number of the inlets of the coil pipes at the positive ends of the 3 coil pipes can be set to be 2, while the number of the inlets of the coil pipes at the negative ends can be set to be 1 and 5 coil pipes, the number of the inlets of the coil pipes at the positive ends can be set to be 3, the temperature rise curve of the battery is shown in fig. 3 (b), and it can be seen that the mode of staggered arrangement of the inlets and the outlets of the coil pipes can effectively reduce the temperature rise of the battery and control the temperature difference within 3K.
As can be seen from the simulation temperature diagram, the temperature difference between the anode and the cathode of the battery can be improved and reduced by adopting a mode that 3 coil pipes are adopted, 2 inlets enter from the top and 1 inlet enters from the bottom, and the temperature difference of the battery is within 2 ℃. By adopting a mode that 5 coil pipes, 3 inlets are fed from the top and 2 inlets are fed from the bottom, the temperature of the battery can be further reduced, the temperature difference between the anode and the cathode is reduced, and the temperature difference of the battery is within 1 ℃.
Example 4
As shown in fig. 5 and 6, in order to further eliminate the temperature variation of the fluid medium caused by the flow in the flowing process of the fluid medium, the temperature of each position of the battery is not consistent. The coil pipe arrangement on the shell can adopt a fluid backflow flowing mode, the coil pipes with semicircular sections are separated by partition plates, fluid media enter one cavity, flow through the other end, flow around and flow back and exit the other cavity. Wherein the section of the coil pipe can be a semi-circular-like section, a rectangular-like section and the like. The present invention is effective in dissipating heat from a battery pack having a cylindrical shape, such as 18650 type cylindrical battery or 26650,42110 type cylindrical battery in the present invention.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that modifications can be made by those skilled in the art without departing from the principle of the present invention, and these modifications should also be construed as the protection scope of the present invention.
Claims (8)
1. The cylindrical power battery module liquid heat management scheme comprises a cylindrical battery (7), and is characterized in that the cylindrical battery (7) is positioned in the hollow interior of a cylindrical shell (1); a spiral coil (4) is arranged on the outer side of the cylindrical shell (1); the spiral coil (4) is wound on the cylindrical shell (1) by different branch coils; the inlet and the outlet of each branch coil pipe are arranged in a staggered manner; the inlet and the outlet of each branch coil pipe are designed symmetrically or asymmetrically, namely all the inlets or outlets are positioned at the positive end or the negative end of the cylindrical battery (7) at the same time; or the inlet or the outlet of one part of the branched coil pipe in the spiral coil pipe (4) is positioned at the positive end of the cylindrical battery (7), and the inlet or the outlet of the other part of the branched coil pipe is positioned at the negative end of the cylindrical battery (7);
each branch coil pipe in the spiral coil pipes (4) is respectively connected with a manifold (2) for leading in a refrigerant and a heat medium and a manifold (5) for leading out the refrigerant and the heat medium through a hose connecting pipe (3); the manifold (2) for leading in the refrigerant and the heat medium and the manifold (5) for leading out the refrigerant and the heat medium are connected with the cooling system and the heating system of the battery module;
the spiral coil is arranged in a fluid backflow mode, the middle of the coil with the semicircular section is separated by a partition plate, and fluid media enter one cavity, flow through the other end, flow around and flow back and exit from the other cavity; the specific heat exchange process is as follows: the cooling medium and the heating medium from the cooling system and the heating system are distributed to a manifold for leading in the cooling medium and the heating medium through the manifold, heat exchange is carried out through the spiral coil and the cylindrical battery, and the heat-exchanged cooling medium or heating medium manifold is collected to the manifold for leading out the cooling medium and the heating medium; when the temperature of the cylindrical power battery is too high, cold media from a cooling system are distributed into the coil pipe through the manifold for introducing the refrigerant and the heat medium, and after the cold media exchange heat with the battery through the coil pipe, the cold media are collected to the manifold for leading out the refrigerant and the heat medium and return to the cooling system; when the temperature of the cylindrical power battery is too low, the heat medium from the heating system is distributed into the coil pipe through the manifold for introducing the refrigerant and the heat medium, and after the heat medium exchanges heat with the battery through the coil pipe, the heat medium is collected to the manifold for introducing the refrigerant and the heat medium and returns to the heating system.
2. The cylindrical power battery module liquid thermal management scheme according to claim 1, wherein the cylindrical shell (1) and the cylindrical battery (7) are in clearance fit, and the gap filling heat conduction material or the cylindrical shell (1) and the cylindrical battery (7) are assembled in interference fit.
3. The cylindrical power battery module liquid heat management scheme according to claim 2, characterized in that a plurality of cylindrical batteries (7) are arranged, and the cylindrical batteries (7) are arranged in rows and columns to form the battery module (6).
4. The cylindrical power battery module liquid thermal management scheme of claim 1, characterized in that the spiral coils (4) are adjacent or not.
5. The cylindrical power battery module liquid thermal management scheme according to claim 1, characterized in that the spiral coil (4) is arranged in a fluid backflow mode, the middle of the coil with the semicircular section is separated by a partition plate, and fluid media enter one cavity, flow through the other end, flow around and flow back and exit from the other cavity.
6. The cylindrical power battery module liquid thermal management scheme of claim 5, wherein the cross section of the coil is a semi-circular-like cross section or a rectangular-like cross section.
7. The cylindrical power battery module liquid heat management scheme is characterized in that the manifold (2) for introducing the refrigerant and the heat medium and the manifold (5) for leading out the refrigerant and the heat medium are positioned in gaps among a plurality of cylindrical batteries (7); and airtight and waterproof sealing rings are arranged at the connecting joints of the manifold (2) for leading in the refrigerant and the heat medium, the manifold (5) for leading out the refrigerant and the heat medium, the cooling system and the heating system of the battery module and the connecting joints of the spiral coil (4).
8. The cylindrical power battery module liquid thermal management scheme of claim 1, characterized in that, cylindrical battery (7) include but not limited to 18650, 26650 cylindrical lithium cell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811470246.XA CN109599640B (en) | 2018-11-27 | 2018-11-27 | Liquid heat management scheme for cylindrical power battery module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811470246.XA CN109599640B (en) | 2018-11-27 | 2018-11-27 | Liquid heat management scheme for cylindrical power battery module |
Publications (2)
| Publication Number | Publication Date |
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| CN109599640A CN109599640A (en) | 2019-04-09 |
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| JP2888016B2 (en) * | 1992-02-20 | 1999-05-10 | 株式会社豊田自動織機製作所 | Spiral battery |
| JP2966292B2 (en) * | 1994-09-08 | 1999-10-25 | 日本碍子株式会社 | Heating apparatus for assembled battery comprising sodium-sulfur battery, assembled battery provided therewith, and heating method |
| CN201789051U (en) * | 2010-09-21 | 2011-04-06 | 许佑正 | Charging battery having heat radiation function |
| CN202474052U (en) * | 2012-03-23 | 2012-10-03 | 浙江南博电源科技有限公司 | High-capacity cylindrical lithium ion battery housing |
| CN202712372U (en) * | 2012-07-26 | 2013-01-30 | 华南理工大学 | Battery cooling device for electric vehicle |
| CN202817140U (en) * | 2012-09-07 | 2013-03-20 | 华南理工大学 | Air cooling and liquid cooling mixed type electric car battery heat managing device |
| JP6233781B2 (en) * | 2014-01-23 | 2017-11-22 | 睦月電機株式会社 | Cooling system |
| CN204668430U (en) * | 2015-06-16 | 2015-09-23 | 湖北文理学院 | A kind of spiral A shape fin heat-dissipating casing for cylinder type lithium battery monomer |
| CN105609895A (en) * | 2016-03-07 | 2016-05-25 | 宁德时代新能源科技股份有限公司 | battery pack thermal management system |
| CN105977426B (en) * | 2016-07-12 | 2019-04-26 | 河南森源重工有限公司 | A kind of electric automobile power battery and its liquid cooling case with liquid cooling case |
| CN106340696A (en) * | 2016-11-10 | 2017-01-18 | 天津御道津欣科技有限公司 | New energy automobile battery heat dissipating and cooling device |
| CN206276363U (en) * | 2016-12-16 | 2017-06-27 | 浙江德远化工有限公司 | Reactor heat-exchanger rig |
| CN108134147A (en) * | 2017-12-21 | 2018-06-08 | 苏州精控能源科技有限公司 | The automobile batteries of capillary network heat dissipation |
| CN108539307B (en) * | 2018-08-08 | 2018-11-16 | 江苏大学 | A kind of high power density power battery cooling system |
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