CN113140830B - Temperature-equalizing plate element with heating function and power battery module applying same - Google Patents
Temperature-equalizing plate element with heating function and power battery module applying same Download PDFInfo
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- CN113140830B CN113140830B CN202010063952.3A CN202010063952A CN113140830B CN 113140830 B CN113140830 B CN 113140830B CN 202010063952 A CN202010063952 A CN 202010063952A CN 113140830 B CN113140830 B CN 113140830B
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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
- H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
- H01M10/625—Vehicles
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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
- H01M10/63—Control systems
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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
- H01M10/6554—Rods or plates
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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
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- Battery Mounting, Suspending (AREA)
Abstract
A temperature-equalizing plate element with a heating function and a power battery module applying the same are provided. The first metal sheet has a first inner surface and a first outer surface, and the first inner surface has a first groove structure provided with a first capillary structure layer. The second metal sheet has a second outer surface. The thick film circuit is disposed on at least one of the first outer surface of the first metal sheet and the second outer surface of the second metal sheet. The thick film circuit is used for converting electric energy into heat energy to heat the temperature-uniforming plate element.
Description
Technical Field
The present invention relates to a temperature equalization plate element with a heating function, and more particularly, to a thermal management element for maintaining the temperature of a power battery module of an electric vehicle at an optimal operating temperature during charging and discharging of the battery of the power battery module, and a power battery module using the temperature equalization plate element with a heating function.
Background
With the rising of environmental awareness, in order to improve the problem of air pollution in the global environment, electric vehicles with clean characteristics have become an important layout in the automobile industry. Electric vehicles use power batteries as driving power, i.e. the stack of battery modules is the main power source for many modern electric vehicles. The battery module is composed of a plurality of modules, and each module is composed of a plurality of single batteries, so that each single battery is a basic unit of the power supply of the electric automobile. The overall performance, operating range, and operation of an electric vehicle are all affected by the performance of the battery modules, and cells.
Lithium ion batteries have high specific power and specific energy density and low discharge rate when not in use, and thus have a longer shelf life, a longer charge-discharge life cycle, and a faster charging capacity than other kinds of batteries, and thus are used as a power source for driving electric vehicles. The purpose of temperature control of the power battery is to keep the power battery in a good working state all the time, and a temperature range of 25 ℃ to 40 ℃ is generally considered as an advantageous condition for operation of the power battery. At extreme temperatures, the capacity of lithium ion batteries decreases in terms of capacity fade, power fade, and self-discharge, all of which indicate that temperature has a tremendous effect on power batteries. At lower temperatures, the reduction in power of the power cell is due to the higher internal resistance; at higher temperatures, the life of the power cell is reduced due to thermal degradation. In the absence of an effective cooling system, the heat storage will cause the temperature of the power cell to rise and may lead to a thermal runaway condition, which may damage the entire battery power source. In the case of thermal runaway, a large number of chain chemical reactions will continue to occur, thereby causing short circuits and possibly causing fires. Therefore, the safety of the power battery in the electric vehicle is one of the main obstacles, which makes the thermal management of the power battery a very important issue in the development of the electric vehicle.
As the endurance of the electric vehicle is required to be higher and higher, the high integration, high-density packaging and thermal management of the single power battery with high energy density become the problems that the power battery module of the electric vehicle must solve. The invention aims to solve the problems of reducing the thickness of a heat dissipation system and a heating system in a power battery and increasing the integration level of a power battery module. Conventional isothermal board devices are used as heat conducting and soaking devices for Hot spots (Hot spots) of electronic devices. If the temperature equalization plate element is applied to a power battery module of an electric vehicle in the charging and discharging process, the temperature equalization plate element is usually arranged between two adjacent single power batteries and the condenser is coupled to two sides of the temperature equalization plate element, so that the function of cooling the battery temperature can be provided. However, when the temperature of the power battery is low, an additional heating mechanism is required to heat the power battery, and therefore, the system integration of the whole power battery module becomes more complicated and the integration density is poor.
Disclosure of Invention
In view of this, the present invention provides a temperature equalization plate element with a heating function and a power battery module using the same, which have a simple structure and are convenient to operate and maintain, and can provide a better temperature management function, effectively improve the working efficiency and the service life of the temperature equalization plate and the battery module, and avoid the influence of high temperature or low temperature.
In order to achieve the above object, the present invention discloses a temperature equalization plate element with heating function, which is characterized by comprising:
a first metal sheet having a first inner surface and a first outer surface, the first inner surface having a first groove structure;
a first capillary structure layer arranged in the first groove structure;
a second metal sheet having a second inner surface and a second outer surface, wherein the periphery of the first metal sheet and the periphery of the second metal sheet are hermetically sealed to form a vacuum chamber;
a working fluid contained in the vacuum cavity; and
the thick film circuit is arranged on at least one of the first outer surface of the first metal sheet and the second outer surface of the second metal sheet and is used for receiving electric energy and converting the electric energy into heat energy so as to heat the temperature equalizing plate element.
The thick film circuit comprises a resistor circuit, one end of the resistor circuit is connected with a positive electrode of a power supply, and the other end of the resistor circuit is connected with a negative electrode of the power supply, so that when a potential difference exists between the positive electrode and the negative electrode to provide electric energy, the resistor circuit receives the electric energy and converts the electric energy into the heat energy.
The resistor circuit further comprises an upper dielectric circuit and a lower dielectric circuit, and the resistor circuit is wrapped between the upper dielectric circuit and the lower dielectric circuit.
When the thick film circuit covers the first outer surface, the coverage area of the thick film circuit is not more than 30% of the area of the first outer surface, and when the thick film circuit covers the second outer surface, the coverage area of the thick film circuit is not more than 30% of the area of the second outer surface.
The second inner surface is provided with a second groove structure, the temperature equalizing plate element with the heating function further comprises a second capillary structure layer arranged in the second groove structure, and the thick film circuit is arranged on the first outer surface and the second outer surface.
Wherein, further include a thick film temperature sensing circuit, set up in at least one in this first surface of this first sheet metal and this second surface of this second sheet metal, this thick film temperature sensing circuit measures the surface temperature of this temperature-uniforming plate element with heating function.
Still disclose a power battery module with samming board spare, its characterized in that contains:
a plurality of unit cells coupled to each other; and
the temperature equalizing plate component with the heating function is arranged and attached between two adjacent single batteries and comprises:
a first metal sheet having a first inner surface and a first outer surface, the first inner surface having a first groove structure;
a first capillary structure layer arranged in the first groove structure;
a second metal sheet having a second inner surface and a second outer surface, wherein the periphery of the first metal sheet and the periphery of the second metal sheet are hermetically sealed to form a vacuum chamber;
a working fluid contained in the vacuum cavity; and
the thick film circuit is arranged on at least one of the first outer surface of the first metal sheet and the second outer surface of the second metal sheet and is used for receiving electric energy and converting the electric energy to provide heat energy to heat the single batteries.
Wherein, the battery further comprises a thermal interface material arranged on a joint interface between the first outer surface and the single battery.
The single battery is provided with a battery section parallel to the first metal sheet, and the area of the first metal sheet is larger than that of the battery section.
Wherein, the groove direction of the first groove structure is vertical to the circuit arrangement direction of the thick film circuit.
Compared with the prior art, the temperature equalizing plate element with the heating function is applied to the power battery module, and the temperature of the power battery module can be controlled to be maintained between 25 ℃ and 40 ℃ by the aid of the heat dissipation structure of the element and the thick film circuit, so that the power battery module can be maintained in the optimal working state. Therefore, when the power battery module of the electric vehicle is used in the charging and discharging processes, the influence caused by high-temperature and low-temperature environments can be avoided, and the working efficiency and the service life of the power battery module are not influenced by high temperature in summer or low temperature in winter.
Drawings
FIG. 1: a schematic cross-sectional view of a thermal plate element with heating function according to an embodiment of the present invention is shown.
FIG. 2: a schematic cross-sectional view of a thermal equalization plate element with heating function according to another embodiment of the present invention is shown.
FIG. 3: a thick film circuit layout diagram of the first outer surface of the first metal sheet of the thermal equalization element with heating function according to an embodiment of the present invention is shown.
FIG. 4: a schematic view of a first groove structure of a first inner surface of a first metal sheet of a temperature equalization plate element with heating function according to another embodiment of the present invention is shown.
FIG. 5: the cross-sectional view of the thick film circuit with the element of the thermal equalization board having the heating function according to an embodiment of the present invention is shown.
FIG. 6: the structure of the power battery module with the temperature equalization plate element having the heating function according to an embodiment of the present invention is schematically illustrated.
FIG. 7: a cross-sectional view along the line A-A' of FIG. 6 is shown.
Detailed Description
In order that the advantages, spirit and features of the invention will be readily understood and appreciated, embodiments thereof will be described in detail hereinafter with reference to the accompanying drawings. It is noted that these embodiments are merely representative of the present invention, and the particular methods, devices, conditions, materials, etc., recited herein are not intended to limit the present invention or the corresponding embodiments. Also, the devices shown in the drawings are merely for relative positional representation and are not drawn to scale as they are actually drawn.
Referring to fig. 1, fig. 1 is a schematic cross-sectional view illustrating a structure of a temperature equalizing plate element 1 with a heating function according to an embodiment of the present invention. As shown in fig. 1, the temperature equalization plate element 1 with heating function of the present invention comprises a first metal sheet 11, a first capillary structure layer 12, a second metal sheet 13, a working fluid (not shown) and a thick film circuit 16. The first metal sheet 11 has a first inner surface 111 and a first outer surface 114, and the first inner surface 111 has a first groove structure 112. The first capillary structure layer 12 is disposed in the first trench structure 112. The second metal sheet 13 has a second inner surface 131 and a second outer surface 134. The periphery of the first metal sheet 11 is hermetically sealed to the periphery of the second metal sheet 13 to form a vacuum chamber 15. The working fluid is contained in the vacuum chamber 15. In practical applications, the liquid working fluid mostly flows in the first capillary structure layer 12, and the gaseous working fluid mostly flows in the air channel 151 between the first capillary structure 12 and the second inner surface 131. The thick film circuit 16 is disposed on at least one of the first outer surface 114 of the first metal sheet 11 and the second outer surface 134 of the second metal sheet 13. The thick film circuit 16 is used for receiving electric energy and converting the electric energy into heat energy so as to heat the temperature equalization board element.
Referring to fig. 2, fig. 2 is a schematic cross-sectional view illustrating a structure of a temperature equalizing plate element 1 with a heating function according to another embodiment of the present invention. Besides the single-sided capillary structure layer shown in fig. 1, the temperature equalization plate element 1 with heating function of the present invention can also be a temperature equalization plate element 1 with heating function with double-sided capillary structure layer. As shown in fig. 2, in addition to the aforementioned elements in the embodiment of fig. 1, the second inner surface 131 may have a second groove structure 132, and the temperature equalization plate element 1 with heating function further includes a second capillary structure layer 14 disposed in the second groove structure 132. And the thick film circuit 16 is disposed on the first outer surface 114 and the second outer surface 134.
In order to prevent the vacuum chamber 15 from deforming, in the embodiment shown in fig. 1, the temperature equalizing plate element 1 with heating function further includes a plurality of first supporting structures 113 disposed in the first groove structures 112, and the first supporting structures 113 are pressed against the second inner surface 131 of the second metal sheet 13. In one embodiment, the periphery of the first inner surface 111 of the first metal sheet 11 may be coupled to the periphery of the second inner surface 131 of the second metal sheet 13 by the bonding layer 17. In practical applications, the bonding layer 17 may be a brazing paste for sealing the periphery of the first inner surface 111 and the periphery of the second inner surface 131 by a brazing process. While the intermediate first support structure 113 is only held against the second inner surface 131 and is not brazed. In the embodiment shown in fig. 2, the temperature-equalizing plate element 1 with heating function further includes a plurality of second supporting structures 133 disposed in the second groove structures 132, and the second supporting structures 133 and the first supporting structures 113 are abutted against each other and are not soldered and sealed. This is to prevent the solvent and polymer in the brazing material paste from contaminating the first capillary structure layer 12 and the second capillary structure layer 14 in the closed space of the vacuum chamber 15 during the high temperature soldering process during brazing.
In practical applications, the first supporting structure 113 and the second supporting structure 133 are at least one of a bar-shaped structure, a pillar-shaped structure, and a combination thereof. In one embodiment, the first and second trench structures 112 and 132, the first and second support structures 113 and 133, and the first and second capillary structure layers 12 and 14 are symmetrical to each other. When the first and second trench structures 112 and 132, the first and second support structures 113 and 133, and the first and second capillary structure layers 12 and 14 are symmetrical to each other, and the support structures are strip-shaped structures, the temperature equalization Plate structure can be regarded as a flat micro-heating tube Plate (Heat Pipe Plate) formed by connecting a plurality of flat micro-heating tube structures side by side.
In practical applications, when the first outer surface 114 and the second outer surface 134 of the temperature equalization plate element 1 with heating function are simultaneously contacted with a heat source, the liquid working fluid in the first capillary structure layer 12 and the second capillary structure layer 14 is heated in the heat absorption region (Evaporator) and changes phase to gas state. The gaseous working fluid moves along the air channel 151 in the vacuum chamber 15 formed between the first trench structure 112 and the second trench structure 132 to the condensation area (Condensor), and the latent heat is dissipated in the condensation area and is transformed into the liquid working fluid again. The liquid working fluid enters the first capillary structure layer 12 and the second capillary structure layer 14, and then is carried to the heat absorption region from the condensation zone through the capillary force of the first capillary structure layer 12 and the second capillary structure layer 14. By the heat dissipation mechanism of the working fluid, the heat generated by the heat source can be efficiently dissipated, so that the temperature-uniforming plate element 1 with the heating function achieves good heat conduction and heat dissipation effects.
Referring to fig. 3 to 5, fig. 3 is a schematic diagram illustrating the layout of the thick film circuit 16 on the first outer surface 114 of the first metal sheet 11 of the isothermal plate element 1 with heating function according to an embodiment of the present invention, fig. 4 is a schematic diagram illustrating the first trench structure 112 on the first inner surface 111 of the first metal sheet 11 of the isothermal plate element 1 with heating function according to another embodiment of the present invention, and fig. 5 is a schematic diagram illustrating the cross-sectional structure of the thick film circuit 16 of the isothermal plate element 1 with heating function according to an embodiment of the present invention. As shown in fig. 3 and 4, the area covered by the thick film circuit 16 on both the first outer surface 114 and the second outer surface 134 is not more than 30% of the area of the first outer surface 114 and the second outer surface 134. This is because if the coverage area of the thick film circuit 16 exceeds 30%, the contact area between the first metal sheet 11 and the second metal sheet 13 and the heat source will be reduced, and the heat dissipation efficiency of the temperature equalization plate member 1 having the heating function will be affected.
When the thick film circuit 16 includes the resistor circuit 161, one end of the resistor circuit 161 is connected to a positive electrode of the power supply, and the other end is connected to a negative electrode of the power supply, and the battery management system controls the power supply of the resistor circuit 161. Fig. 3 shows a covering manner of the same-side power source, but it is understood that the thick film circuit 16 may also be a covering manner of the different-side power source. The material of the first metal sheet 11 and the second metal sheet 13 of the temperature equalizing plate element 1 with the heating function is copper or copper alloy, and the surface material of the single battery is usually aluminum. Since copper has a higher thermal conductivity than aluminum, the resistive circuit 161 receives electrical energy when a potential difference is applied between the positive and negative electrodes to provide electrical energy, causing the thick film circuit 16 to generate thermal energy. The heat energy generated by the thick film circuit 16 is preferentially conducted to the temperature equalizing plate element 1 with higher heat conductivity coefficient and heating function, and then the temperature equalizing plate element 1 with heating function uniformly conducts the heat energy to the surface of the single battery so as to improve the temperature of the single battery.
The resistor circuit 161 further includes an upper dielectric circuit 162 and a lower dielectric circuit 163, and the resistor circuit 161 is enclosed between the upper dielectric circuit 162 and the lower dielectric circuit 163. The upper dielectric circuit 162 and the lower dielectric circuit 163 can be used to block the resistance circuit 161 and the copper metal on the surface of the uniform temperature plate element 1 with heating function and the aluminum metal on the surface of the single battery from being electrically conducted. In addition, in practical applications, the thick film circuit 16 may also be an inductor circuit.
Referring to fig. 6 and 7, fig. 6 isbase:Sub>A schematic structural diagram ofbase:Sub>A power battery module B ofbase:Sub>A thermal equalization plate element 1 withbase:Sub>A heating function according to an embodiment of the present invention, and fig. 7 isbase:Sub>A schematic sectional diagram ofbase:Sub>A section linebase:Sub>A-base:Sub>A' according to fig. 6. As shown in fig. 2, fig. 6 and fig. 7, the Battery Module B (Battery Module) of the present invention may have the temperature equalizing plate element 1 with the heating function, which includes a plurality of Battery cells 2 (Battery cells) and a plurality of temperature equalizing plate elements 1 with the heating function. The unit cells 2 are coupled to each other in series or in parallel. The temperature equalization plate element 1 with the heating function is arranged and attached between two adjacent single batteries 2 and comprises a first metal sheet 11, a first capillary structure layer 12, a second metal sheet 13, a working fluid (not shown) and a thick film circuit 16. The first metal sheet 11 has a first inner surface 111 and a first outer surface 114, and the first inner surface 111 has a first groove structure 112. The first capillary structure layer 12 is disposed in the first trench structure 112. The second metal sheet 13 has a second inner surface 131 and a second outer surface 134. The periphery of the first metal sheet 11 is in a gas-tight fit with the periphery of the second metal sheet 13 forming a vacuum cavity 15. The working fluid is contained in the vacuum chamber 15. The thick film circuit 16 is disposed on at least one of the first outer surface 114 of the first metal sheet 11 and the second outer surface 134 of the second metal sheet 13. The thick film circuit 16 is used for receiving electric energy and converting the electric energy into heat energy. Therefore, the thick film circuit 16 heats the temperature equalizing plate element 1 with the heating function and uniformly provides heat energy to the single battery 2 so as to raise the temperature of the single battery 2 to a proper charging and discharging operation temperature.
In practical applications, the power received by the thick film circuit 16 can be provided by the battery management system, or can be provided by the adjacent single battery 2.
Referring to fig. 2, 3, 4 and 7, the first outer surface 114 and the adjacent single battery 2, and the second outer surface 134 and the adjacent single battery 2 have the bonding interface 18 (dashed area). The bonding interface 18 includes a portion of the first outer surface 114 and the second outer surface 134 not covered by the thick film circuit 16, and may also include a portion of the upper dielectric circuit 162 coupled to the adjacent unit cell 2. In order to prevent the temperature of the single battery 2 from being higher than the working temperature range of the optimal operation, it is necessary to ensure that the heat energy of the single battery 2 is conducted to the temperature equalizing plate element 1 with the heating function to dissipate the heat; furthermore, in order to keep the temperature of the single battery 2 below the optimum operating temperature range, it is necessary to ensure that the heat generated by the thick film circuit 16 is supplied to the single battery 2. Accordingly, the thermal interface material 3 can be bonded or coated on the bonding interface 18 to fill up the height difference between the thick film circuit 16 and the structures on the surfaces of the first metal sheet 11 and the second metal sheet 13 of the isothermal plate element 1 with heating function. Therefore, the heat energy generated by the temperature equalizing plate element 1 with the heating function can be conducted to the surface of the single battery 2; meanwhile, the heat energy on the surface of the single battery 2 can be conducted to the temperature equalizing plate element 1 with the heating function to dissipate heat, so that the actuating efficiency of the temperature equalizing plate element 1 with the heating function is improved.
In practical applications, the power battery module B may further include a heating device, which includes a temperature detecting component and a temperature control component. The temperature detecting part may be used to detect the temperature of the single battery 2, and the temperature control part may be used to selectively control the thick film circuit 16 to provide heat energy to the single battery 2. When the temperature detecting component detects that the temperature of the single battery 2 is lower than the working temperature range of the optimal operation, the temperature control component controls the power supply to provide the electric energy to the thick film circuit 16, so that the thick film circuit 16 converts the electric energy into heat energy to heat the single battery 2. On the contrary, when the temperature detecting component detects that the temperature of the single battery 2 is higher than the working temperature range of the optimal operation, the temperature control component stops providing the electric energy to the thick film circuit 16, so that the temperature equalizing plate component 1 with the heating function starts a liquid-gas two-phase circulation mechanism to dissipate the heat energy of the single battery 2.
In the embodiment of fig. 3, the temperature detecting component can dispose the thick film temperature sensing circuit 19 on the first outer surface 114 of the first metal sheet 11 or the second outer surface 134 of the second metal sheet 13 of the temperature equalizing element 1 with heating function in the manner of disposing the thick film circuit 16. In practical applications, the thick film temperature sensing circuit 19 can be directly attached to the surface of the single battery 2 to detect the temperature of the single battery 2.
As shown in fig. 3, fig. 4 and fig. 7, fig. 3 is a thick film circuit 16 on a first outer surface 114 of the first metal sheet 11, and fig. 4 is a first groove structure 112 on a first inner surface 111 of the first metal sheet 11, wherein the dotted bonding interface 18 is a portion where the first outer surface 114 overlaps with the single cell 2 when the temperature equalization plate element 1 with heating function and the single cell are stacked. Comparing fig. 3 and fig. 4, the circuit layout of the thick film circuit 16 of fig. 3 is arranged longitudinally, while the first trench structure 112 and the first supporting structure 113 of fig. 4 are arranged transversely. This arrangement is because the thick film circuit 16 mainly functions to provide heat energy at low temperature, and the first trench structure 112 and the first supporting structure 113 mainly serve to guide the operation direction of the working fluid for heat dissipation, and if the thick film circuit 16 is wired to cover the first capillary structure layer 12 in the first trench structure 112, the boiling of the liquid working fluid and the heat transfer efficiency of the gaseous working fluid are affected.
The wiring of the thick film circuit 16 is mostly arranged in a direction perpendicular to the arrangement direction of the first capillary structure layer 12 and the first supporting structure 113, so that the coverage of the thick film circuit 16 on the first capillary structure layer 12 is reduced, and the influence of the thick film circuit on the function of the temperature equalization plate is reduced. Therefore, the efficiency of the heating function and the heat dissipation function of the temperature-uniforming plate element 1 with the heating function can be in the best state by adopting the non-overlapping arrangement mode.
In addition, the wiring of the thick film circuit 16 in fig. 3 is mainly within the dotted line, that is, at the position overlapping the single cell 2, because the thick film circuit 16 is mainly arranged at the position where the thick film circuit 16 overlaps the single cell 2 for heating the single cell 2 most effectively. The first trench structure 112 and the first support structure 113 in fig. 4 cover the range beyond the dotted line. This arrangement is so because the unit cells 2 are parallel to the cell cross section of the first metal sheet 11, and the area of the first metal sheet 11 is larger than the area of the cell cross section.
The temperature equalizing element 1 has a heat absorbing region and a condensing region, and in the embodiment of fig. 6 and 7, the heat absorbing region is a central portion (dotted line region) attached to the single battery 2, and the condensing region is a portion (non-dotted line region) protruding from the single battery 2. In practical applications, the condensation area can be coupled to the heat dissipation module 4 to enhance the heat dissipation effect. The heat dissipation module 4 may be a heat dissipation fin or a water cooling device system. It should be noted that the second metal sheet 13 having the second trench structure 132, the second support structure 133 and the second capillary structure layer 14 may also have the same configuration as the first metal sheet 11, and will not be described herein again.
Compared with the prior art, the temperature equalizing plate element 1 with the heating function and the power battery module B with the temperature equalizing plate 1 with the heating function can control the temperature of the power battery module B to be maintained in the optimal working temperature range of 25 ℃ to 40 ℃ by the aid of the heat dissipation structure of the temperature equalizing plate element and the thick film circuit 16, so that the power battery module B is maintained in the optimal working state. Therefore, the electric vehicle using the power battery module B of the invention can be suitable for any severe temperature environment, and the working efficiency of the power battery module B is not influenced by high temperature in summer or low temperature in winter.
The above detailed description of the preferred embodiments is intended to more clearly illustrate the features and spirit of the present invention, and is not intended to limit the scope of the present invention by the preferred embodiments disclosed above. On the contrary, it is intended to cover various modifications and equivalent arrangements included within the scope of the claims. The scope of the invention should, therefore, be determined with reference to the above description as interpreted in the broadest possible manner, and in all possible variations and equivalent arrangements.
Claims (9)
1. A temperature equalization plate element with heating function, characterized by comprising:
a first metal sheet having a first inner surface and a first outer surface, wherein the first inner surface has a plurality of elongated first groove structures;
a first capillary structure layer arranged in the first groove structure;
a second metal sheet having a second inner surface and a second outer surface, the periphery of the first metal sheet and the periphery of the second metal sheet being hermetically sealed to form a vacuum chamber;
a working fluid contained in the vacuum cavity; and
the thick film circuit is arranged on at least one of the first outer surface of the first metal sheet and the second outer surface of the second metal sheet, the circuit arrangement direction of the thick film circuit is perpendicular to the groove direction of the first groove structures, and the thick film circuit is used for receiving electric energy and converting the electric energy into heat energy to heat the temperature equalizing plate element.
2. The temperature-uniforming plate element with heating function of claim 1, wherein the thick film circuit comprises a resistor circuit, one end of the resistor circuit is connected to a positive electrode of a power supply, and the other end is connected to a negative electrode of the power supply, so that when a potential difference exists between the positive electrode and the negative electrode to provide an electric energy, the resistor circuit receives the electric energy and converts the electric energy into the heat energy.
3. The device of claim 2, wherein the resistor circuit further comprises an upper dielectric circuit and a lower dielectric circuit, and the resistor circuit is disposed between the upper dielectric circuit and the lower dielectric circuit.
4. The device of claim 1, wherein when the thick film circuit is applied to the first outer surface, the thick film circuit covers no more than 30% of the area of the first outer surface, and when the thick film circuit is applied to the second outer surface, the thick film circuit covers no more than 30% of the area of the second outer surface.
5. The temperature equalizing plate member as claimed in claim 1, wherein the second inner surface has a second groove structure, the temperature equalizing plate member further comprises a second capillary structure layer disposed in the second groove structure, and the thick film circuit is disposed on the first outer surface and the second outer surface.
6. The device as claimed in claim 1, further comprising a thick film temperature sensing circuit disposed on at least one of the first outer surface of the first metal sheet and the second outer surface of the second metal sheet, wherein the thick film temperature sensing circuit measures a surface temperature of the device.
7. A power battery module with a temperature equalization plate element is characterized by comprising:
a plurality of unit cells coupled to each other; and
the temperature equalizing plate component with the heating function is arranged and attached between two adjacent single batteries and comprises:
a first metal sheet having a first inner surface and a first outer surface, wherein the first inner surface has a plurality of elongated first groove structures;
a first capillary structure layer arranged in the first groove structure;
a second metal sheet having a second inner surface and a second outer surface, the periphery of the first metal sheet and the periphery of the second metal sheet being hermetically sealed to form a vacuum chamber;
a working fluid contained in the vacuum cavity; and
the thick film circuit is arranged on at least one of the first outer surface of the first metal sheet and the second outer surface of the second metal sheet, the circuit arrangement direction of the thick film circuit is perpendicular to the groove direction of the first groove structures, and the thick film circuit is used for receiving electric energy and converting the electric energy to provide heat energy to heat the single batteries.
8. The power battery module of claim 7, further comprising a thermal interface material disposed at a compliant interface between the first outer surface and the battery cells.
9. The power battery module as claimed in claim 7, wherein the single battery has a battery cross section parallel to the first metal sheet, and the area of the first metal sheet is larger than that of the battery cross section.
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