Electric vehicle with more efficient range extension

Abstract

An electric vehicle with more efficient range extension, characterized in that instead of just one electric motor drive with its associated battery, two different electric motors, each with a different battery, drive the vehicle on a single drive shaft. The asynchronous motor, powered by a sodium-ion battery (without braking torque), is constantly in operation as the primary motor. The second motor is a permanent magnet synchronous motor, driven by, for example, fast-charging silicon-dominated battery cells. This second motor is engaged via a power control system during acceleration and uphill driving, and is always put into recuperation mode during braking and downhill driving. The continuously running primary motor only assists the secondary motor when driving downhill, thus increasing recuperation. Drawing labels: 1 car wheels 2 Drive shaft 3 double power transmission 4 Electric first motor 5 Electric second motor 6 sodium-ion battery 7 Silicon-dominated battery 8. Recuperation / Drive Control 9 Power supply pedal 10 Clutch Secondary Engine

Description

[0001] According to the current state of the art, electric vehicles achieve up to 30 percent energy savings through recuperation in city traffic, but less on highways and longer distances (see Appendix A1). The present invention enables significantly higher energy savings through recuperation. The rationale for this is the latest state of the art regarding the rapidly rechargeable, silicon-dominated battery cells from the Israeli company "StoreDot" (see A2a+b): “The batteries were charged to 80 percent within 15 minutes and then discharged for one hour.” In 10 years, “StorDot” will be able to supply battery cells that can recharge energy for a range of 160 kilometers in just two minutes.

[0002] This development provides unprecedented possibilities for the optimal application of recuperation, e.g. to charge an electric vehicle while driving through recuperation.

[0003] The faster the corresponding battery cells can be charged and the higher the charging pressure, e.g. due to intensive downhill driving supported by a primary engine, the more electricity is stored for the range extension.

[0004] It should be noted that the lithium-ion batteries commonly used in the current state of the art are expensive. While they can be charged relatively quickly, they only deliver optimal performance in the medium temperature range compared to, for example, sodium-ion batteries. (see A3a+b).

[0005] The above-mentioned silicon-dominated battery cells are most likely also expensive and should therefore be used in hybrid form, e.g. with a sodium-ion battery, which is much more cost-effective.

[0006] The present patent application is intended to contribute to an optimal interaction of the latter two battery types with a suitable electric motor, resulting in the advantages and disadvantages of both drive types being balanced out, characterized in that the first motor, powered by a sodium-ion battery, runs continuously and the second motor with the silicon-dominated battery cells is switched on during acceleration and when driving uphill, and is always put into recuperation mode when braking and when driving downhill, with the help of a clutch.

[0007] Since, according to the company “StorDot” (see A2), the energy supplied during recuperation is absorbed very quickly by its battery cells, it could be achieved that only the sodium-ion battery needs to be charged externally from the charging boxes.

[0008] An embodiment of the invention is shown in the accompanying drawing and is described below: Name of the figures: 1 car wheels 2 drive shaft 3 double power transmission 4 Electric first motor 5 Second electric motor 6 Sodium-ion battery 7 Silicon-dominated battery 8 Regenerative braking / drive assistance control 9 Power supply pedal 10 Coupling second engine

[0009] The car wheels (1) and the drive shaft (2) shown in the drawing show the double power transmission of the hybrid drive (3) to the drive shaft by the two electric motors (4+5).

[0010] The permanently running first motor (4) is an asynchronous motor driven by a sodium-ion battery, which, although heavier than that of the second motor, is less expensive to manufacture; it is environmentally friendly to dispose of and less prone to overheating and other safety problems (see A3a+b).

[0011] The secondary motor (5), powered by a rapidly rechargeable, e.g., silicon-dominated battery (see A2), is connected to the drive shaft (2) by a coupling (10) that interrupts the connection to the drive shaft when, on a level road surface, the primary motor (4) keeps the electric car running with sufficient power transmission; when accelerating and driving uphill, the secondary motor (5) is engaged via the coupling.

[0012] This coupling is necessary because, unlike the asynchronous motor, the second motor (5) is a permanent magnet synchronous motor, which, unlike the asynchronous motor, has no braking torque when idling. It is used less frequently in hybrid operation and is deactivated by the coupling (10), but it provides intensive support to the first motor (4) when driving uphill and accelerating.

[0013] The recuperation control (8) operates the clutch (on / off) at the push of a button.

[0014] The power supply (9) is controlled via a standard accelerator pedal.

[0015] When a "vector-controlled frequency converter" is switched on when the current supply (9) increases, the asynchronous motor (4) offers an even wider speed range and simultaneously high starting torque with relatively high efficiency. Additionally, the second motor (5) is switched on via the control system (8) in such a way that it adapts to the increase in current supply, thus preventing mechanical overload of the drive shaft due to different speeds of the two electric motors.

[0016] The primary motor is powered by a sodium-ion battery (6), which is more cost-effective than commercially available lithium-ion batteries or silicon-dominated battery cells, but cannot be charged as quickly as, in particular, the silicon-dominated battery of the secondary motor. Due to the charging speed and the different acquisition costs, the power supply of the two electric motors was distributed across two different drive systems: the primary motor (4) with a sodium-ion battery (6) and the secondary motor (5) with a silicon-dominated battery (7).

[0017] The advantages of this patent application are that there is a highly efficient range extension through highly efficient recuperation, which always takes place when the corresponding battery cells that absorb the generated power also store it as quickly as possible in order to absorb the boost pressure to the full extent, e.g. when the primary engine intensively supports downhill driving.

[0018] Furthermore, the highest possible efficiency of the overall system is possible through the mutual support of the two motors (first and second motor).

[0019] Last but not least, the overall cost of battery assembly is reduced by selecting and integrating the sodium-ion battery.

Claims

[] Electric vehicle with more efficient range extension, characterized by Instead of just one electric motor with its associated battery, two different electric motors, each with different batteries, drive the vehicle on a drive shaft. The asynchronous motor (without braking torque), powered by a sodium-ion battery, is constantly in operation as the first motor. The second motor is a permanent magnet synchronous motor, powered by, for example, fast-charging silicon-dominated battery cells. It is switched on via a power control system during acceleration and when driving uphill, and is always put into recuperation mode when braking and driving downhill. The constantly running first motor supports the second motor when driving downhill, thereby increasing recuperation.

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