The present disclosure relates generally to an electricity supply element group, and particularly to a high-voltage, high-capacity, and three-dimensionalized horizontal composite electricity supply element group.
In recent years, due to the exhaustion of petrochemical fuels and the prevalence of the consciousness of environmental protection, people are forced to rethink how to balance between living convenience and environmental protection for those objects using petrochemical fuels as the power source and exhausting massive greenhouse gases. Cars, as important transportation vehicles, become one of the primary objects to be inspected. Accordingly, under the global trend of energy saving and carbon reduction, many countries worldwide set car electrification as an important target for carbon dioxide reduction. Unfortunately, electric cars face many problems in practical applications. For example, the capacity of electricity supply elements, such as batteries, limits the endurance. Consequently, more batteries should be connected in series or parallelly for increasing the capacity and thus extending the mileage.
To reducing the car weight for extending mileage, the secondary batteries with high energy density and light weight, such as lithium-ion secondary batteries, become the best choice for the battery of electric cars. Nonetheless, how to assemble multiple lithium-ion secondary batteries to form a safe and stable power source has become an urgent challenge for people.
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According to the US patent application No. 2004/0091771, adjacent battery modules share a common electricity collecting layer. By using this method, the problem of electrolyte decomposition as described above can be solved. Unfortunately, owing to the series connection to the common electricity collecting layer, the design will be less flexible. Only internal series connection can be adopted. To form a battery module, external parallel connection of a plurality of battery cells still should be adopted.
Furthermore, according to a composite electricity supply element group of Taiwan patent application No. 106136071, serial and parallel connections of electricity supply element group can be done inside battery cells directly for giving high-voltage and high-unit-capacity battery cells, eliminating the drawbacks of lower performance and reduced capacity density due to external connection according to the prior art. Unfortunately, according to the technology, the electricity supply element achieves high capacity and high voltage by vertically stacking a great number of electricity supply elements for serial and/or parallel connections.
Nonetheless, while facing puncture of metal objects, the high voltage drop caused by puncture is unavoidable extremely dangerous for fully solid, pseudo solid (solid/liquid), or liquid electrolyte systems. It is particularly dangerous for electricity supply element group formed by vertically stacking massive electricity supply elements internally by series connections.
According to the drawbacks, the present disclosure provides a novel horizontal composite electricity supply element group for avoiding safety concerns caused by puncture of battery elements by metal objects.
An objective of the present disclosure is to provide a horizontal composite electricity supply element group, which adopts horizontal series and/or parallel connections to connect electrically multiple electricity supply element groups for reducing the number of vertically stacked electricity supply elements and avoiding safety problems caused by puncture of battery elements by metal objects.
Another objective of the present disclosure is to provide a horizontal composite electricity supply element group. A first insulation layer and a second insulation are disposed at the top and bottom, respectively. Multiple electricity supply element groups extending horizontally and connected serially and/or parallelly are disposed between the first and second insulation layers. By using the first and second insulation layers, the potential damages caused by punctures on the electricity supply elements by external metal objects can be prevented.
Another objective of the present disclosure is to provide a horizontal composite electricity supply element group. There is no electrochemical reaction between adjacent electricity supply elements except charge transfer. Thereby, electricity supply elements will not limit to the maximum voltage of allowance of electrolyte, and could connect in series and/or parallel way. Hence, the capacity density and voltage can be improved.
Still another objective of the present disclosure is to provide a horizontal composite electricity supply element group. Multiple channels are formed between adjacent electricity supply element groups, acting as paths for heat dissipation.
A further objective of the present disclosure is to provide a horizontal composite electricity supply element group. The electricity collecting layers between adjacent electricity supply elements contact directly. The contact area is much larger than the one by nickel plate soldering according to the prior art. Thereby, the internal resistance of the electricity supply element group can be reduced substantially. The performance of the power module formed by the electricity supply element groups hardly loses. In addition, because the reduction of resistance, the charging and discharging speed increase significantly, and the heating problem is reduced significantly. Then the cooling system of the power module can be simplified, and the management and control will be easier. Thereby, the reliability and safety of the overall composite electricity supply element group can be enhanced.
To achieve the above objectives, the present disclosure provides a horizontal composite electricity supply element group, which comprises a first insulation layer, a second insulation layer, a first patterned conductive layer, a second patterned conductive layer, and a plurality of electricity supply element groups. The second insulation layer is disposed opposing to the first insulation layer. The first patterned conductive layer is disposed on a first surface of the first insulation layer. The second patterned conductive layer is disposed on a second surface of the second insulation layer. The first patterned conductive layer is opposing to the second patterned conductive layer. The plurality of electricity supply element groups are disposed between the first insulation layer and the second insulation layer, and connected serially and/or parallelly via the first patterned conductive layer and the second patterned conductive layer. Each electricity supply element comprises an isolation layer, two active material layers, two electricity collecting layers, an electrolyte system, and a package layer. The two active material layers are disposed on both sides of the isolation layer, respectively. The two electricity collecting layers are disposed on the outer sides of the active material layers, respectively. The electrolyte system is disposed in the active material layers. The package layer is disposed on the periphery of the two electricity collecting layers for gluing the electricity collecting layers and encapsulating the electrolyte system between the two electricity collecting layers. In other words, each electricity supply element is an independent module. The electrolyte system does not circulate to one another. There is no electrochemical reaction between adjacent electricity supply elements except charge transfer. Thereby, electricity supply elements will not be limited to the maximum voltage of allowance of electrolyte, and could connect in series and/or parallel at same time.
In the following, concrete embodiment are described in detail for understanding the objective, technologies, feature, and the effects provided by the present disclosure.
Given the safety problem caused by puncture on multiple electricity supply element stacked vertically and connected serially/parallelly by metal sharp objects for the demand of high voltage and high capacity, the present disclosure provides a novel horizontal composite electricity supply element group to solve the puncture problem. The above composite electricity supply unit can be any supply element capable of storing energy and supply external devices, such as batteries or capacitors.
The present disclosure mainly discloses a horizontal composite electricity supply element group, which comprises a plurality of electricity supply element groups. The electricity supply element group comprises one or more vertically serial and or parallel connected electricity supply elements. Then, after the electricity supply element groups are connected serially or parallelly in the horizontal direction via the first and second patterned conductive layers, a first terminal and a second terminal are connected to electricity supply element groups to form the composite electricity supply element group. In other words, inside the composite electricity supply element group, series and parallel connections can be done concurrently. The electricity supply elements forming the electricity supply element group according to the present disclosure are independent and complete electricity supply modules. They don't share electrolyte systems. Figures are used for further description. For convenience, a lithium battery is adopted in the following embodiment for description. A person having ordinary skill in the art knows well that the embodiment is not used to limit the scope of the present disclosure.
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The electricity supply element group 20 as described above is formed by one or more electricity supply elements 22. For example, in
The material of the isolation layer 226 with micro holes allowing ions to passing through can be selected from the group consisting of polymer materials, ceramic materials, and glass fiber materials. The micro holes can be penetrating holes, nonlinear holes, or even made by porous materials. In addition, porous ceramic insulative materials can be distributed inside the micro hole of the substrate. The ceramic insulative materials can be formed by materials such as micrometer- or nanometer-grade titanium dioxide (TiO2), aluminum oxide (Al2O3), silicon dioxide (SiO2), or alkylated ceramic particles. The ceramic insulative material can further include polymer adhesives, such as polyvinylidene fluoride (PVDF), polyvinylidene fluoride-co-hexafluoropropylene (PVDF-HFP), polytetrafluoroethylene (PTFE), acrylic acid glue, epoxy, polyethylene oxide (PEO), polyacrylonitrile (PAN), or polyimide (PI).
The electrolyte system is disposed in the first and second active material layers 225, 227. The form of the electrolyte system can be selected from the group consisting of liquid state, pseudo solid state, gel state, solid state or combinations thereof. The active materials of the active material layers 225, 227 can convert chemical energy to electrical energy for usage (supplying electricity) or electrical energy to chemical energy for storage (charging), and can achieve ion conduction and transport concurrently. The generated electrons can be led outward via the first and second electricity collecting layers 222, 223. The common materials for the first and second electricity collecting layers 222, 223 include copper and aluminum. Alternatively, they can include other metals such as nickel, tin, silver and gold, metal alloys or stainless steel.
The material of the package layer 224 can include epoxy, polyethylene, polypropylene, polyurethane, thermoplastic polyimide, silicone, acrylic resin, or ultraviolet-hardened glue. The material is disposed on the periphery of the two electricity collecting layers 222, 223 for gluing them and sealing the electrolyte system therebetween for avoiding leakage and circulation with the electrolyte system of other electricity supply elements 22. Thereby, the electricity supply element 22 is an independent and complete electricity supply module.
To improve the sealing effect of the package layer 224, the package layer 224 can be designed to have three layers. Please refer to
In addition, for easier description and identification, the electricity supply elements 22 in the figures for illustrating the horizontal composite electricity supply element group use simple positive and negative symbols to identify the positive and negative electrical polarities, instead of plotting the detailed components of the electricity supply element 22 as shown in
As shown in
The top surface electrode (the first electricity collecting layer 222) of the topmost electricity supply element 22 in the electricity supply element group 20 contacts directly the first patterned conductive layer 16 to form electrical connection. The bottom surface electrode (the second electricity collecting layer 223) of the bottommost electricity supply element 22 in the electricity supply element group 20 contact the second patterned conductive layer 18 to form electrical connection. The method of direct contact as described above can be physical contact or chemical contact. More specifically, direct contact can be formed by soldering with or without soldering material or by melting method. Alternatively, conductive silver glue or conductive cloth can be adopted.
The horizontal composite electricity supply element group 10 according to the present disclosure further comprises a first conductive lead 24 and a second conductive lead 26. In
Furthermore, the first conductive lead 24 and the second conductive lead 26 can be formed integrally with the first patterned conductive layer 16 or the second patterned conductive layer 26 connected electrically with them. In other words, during the process of patterning, the patterns of the first conductive lead 24 and the second conductive lead 26 are reserved. When the first and second conductive leads 24, 26 are formed not adopting the integral method, the materials of the first and second conductive leads 24, 26 can be different from those of the first and/or second patterned conductive layers 16, 18. In addition, direct contact can be formed by soldering with or without soldering material, or by melting method. Alternatively, conductive silver glue or conductive cloth can be adopted.
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Under the architecture of the horizontal composite electricity supply element group according to the present disclosure, to increase the total capacity or total voltage of the battery module, the only thing to do is to perform external series/parallel connection of multiple horizontal composite electricity supply element groups 10 by using the first and second conductive leads 24, 26. Then the total capacity or the total voltage of the battery module can be increased. For example, by externally connecting serially multiple horizontal composite electricity supply element groups 10, the total voltage can be increased, as shown in
To increase the voltage of a single horizontal composite electricity supply element group, simply add the electricity supply element group. For example, as shown in
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The benefits of the present disclosure will be further described. For example, according to the composite electricity supply element group of the Taiwan patent application No. 106136071, 24 electricity supply elements are vertically and serially connected to give a voltage value of 24*4.2 volts. By adopting the horizontal composite electricity supply element group according to the present disclosure given the same voltage value and number of electricity supply elements, 24 single electricity supply elements can be connected in opposite polarities in horizontal direction via the first and second patterned conductive layers 16, 18, as the horizontal extension state shown in
Moreover, in addition to blocking puncture effectively, the first and second insulation layers 12, 14 according to the present disclosure can act as the blocking layers for electrical contact between the first and second patterned conductive layers when multiple battery cells 10 are externally connected serially and/or parallelly.
Next, when the electricity supply element group 20 is formed by two or more electricity supply elements 22, the serial and/or parallel configurations of the plurality of electricity supply elements 22 are described.
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To sum up, the present disclosure provides a horizontal composite electricity supply element group, which comprises multiple electricity supply element group arranged side by side. The electricity supply element group are serially and/or parallelly connected internally in a horizontal extension method via the first and second patterned conductive layer for reaching a certain voltage and capacity. In addition, external series and/or parallel connections of multiple horizontal composite electricity supply element groups can be done via the first and second conductive leads of the horizontal composite electricity supply element groups. Furthermore, the horizontal composite electricity supply element group according to the present disclosure comprises a first and second insulation layer at the top and bottom acting as the blocking layer for electrical contact of the first and second patterned conductive layers between battery cells as well as effectively preventing potential damages caused by puncture of metal objects.
Accordingly, the present disclosure conforms to the legal requirements owing to its novelty, nonobviousness, and utility. However, the foregoing description is only embodiments of the present disclosure, not used to limit the scope and range of the present disclosure. Those equivalent changes or modifications made according to the shape, structure, feature, or spirit described in the claims of the present disclosure are included in the appended claims of the present disclosure.
Number | Date | Country | Kind |
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107127704 | Aug 2018 | TW | national |
107135859 | Oct 2018 | TW | national |