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Portable Traction Battery – PTB - for cheap electric vehicle
Authors: Liviu Giurca, Virgil Profeanu, Adrian Laculiceanu
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One of the reasons is that battery pack is not standardized due to its shape and capacity among auto-
industry. The seco...
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The illustration below describes the practical solution of the invention.
The number of PTBs embarked in the car corresp...
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When the PTB is mounted is also clipped in the vehicle interface. The vehicle interface can be a
retractable drawer as c...
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Type B PTB, beside the wheels, presents a retractable handle which is retired after PTB takes its place on
the vehicle.
...
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Return for customer
Tesla Li-ion battery, made in its Gigafactory, costs around 300$/kW but is an exception. Usually pri...
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-Extension of the electrification to new vehicle classes;
-Scalability of the battery structure;
-Adaptability to differ...
of 7

Portable taction battery_for_cheap_electric_vehicles

Sooner or later the traction batteries for vehicles will finish to be standardized as they were the batteries used for home portable devices. That will influence positively the manufacturing cost, one of the most critical aspects of these batteries. The electric vehicles found in the same yard, having same owner, will use same batteries, which will only be easy moved from one vehicle to the other. The total vehicle cost will be also dramatically reduced. In emergency case, the traction battery will be used as a back-up source of power at home. The present work describes a possible solution for the major issues of the electric vehicles.
Published on: Mar 4, 2016
Published in: Automotive      
Source: www.slideshare.net


Transcripts - Portable taction battery_for_cheap_electric_vehicles

  • 1. 1 Portable Traction Battery – PTB - for cheap electric vehicle Authors: Liviu Giurca, Virgil Profeanu, Adrian Laculiceanu VP Holding Management System Abstract: Sooner or later the traction batteries for vehicles will finish to be standardized as they were the batteries used for home portable devices. That will influence positively the manufacturing cost, one of the most critical aspects of these batteries. The electric vehicles found in the same yard, having same owner, will use same batteries, which will only be easy moved from one vehicle to the other. The total vehicle cost will be also dramatically reduced. In emergency case, the traction battery will be used as a back-up source of power at home. INTRODUCTION Consumers purchase cars based on how they value multiple attributes. Cost is an important consideration, but not the only one. Electric vehicle (EV) manufacturers must work hard to ensure that electric cars are comparable over a wide range of attributes, but EVs are plagued by limited range (the number of miles they can be driven before they need to be recharged), and consumers remain worried about the reliability of EVs relative to conventional vehicles. Regardless, the bottom line is that the range issue will significantly affect consumer choice and is a major barrier to the penetration of electric vehicles. The present work describes a possible solution for all these major issues of EVs. STATE OF THE ART Architecturally, an electric vehicle battery pack is comprised of multi-battery modules, fuses, BMS and safety circuitry system which are combined into one large battery enclosure. Combining all the parts in one package makes the battery pack very heavy. Due to the size and weight of the battery pack, the electric vehicle has limited range of travel. And in case of traveling a long distance journey, normally a driver has to stop at several charging stations to recharge the battery, and recharging the battery is time consuming for drivers and some don't have that much time to waste. The idea of swappable large battery pack with a fresh battery pack was proposed many times before, and seems to solve the problem neatly. A company named Better Place already experienced such concept, but, unfortunately for them, with catastrophic result.
  • 2. 2 One of the reasons is that battery pack is not standardized due to its shape and capacity among auto- industry. The second issue is the actual battery packs are heavy and usually weights around 150 kg to 300 kg and exchanging these batteries are huge tasks. The third problem is the high cost associated with maintaining a huge standing store of fresh packs at battery station. A more spreading solution can be this proposed by Matra and AllCell Technologies for an electric scooter. This scooter uses a manually swappable 48V Li-ion battery with no active cooling system. For scooters and e-bikes can be a good answer. Unfortunately in this case the battery capacity is limited by the battery size/weight and this solution cannot be a convenient solution for bigger four wheels vehicles. If the weight will be bigger the battery cannot be easy raised to this height and mounted by a single person. DEVELOPMENT GOALS The use of small/medium modulated battery packs is an important factor for auto-industry to standardized EV battery. For example electric and electronic devices uses standard batteries (e.g. AAA, AA, C, D batteries, etc.), the electric vehicle's battery packs can also be standardized for E-scooters, EV cars, small EV tracks or tractors, and etc. Such standards will advances electric vehicle into next level for more practical use. There are enormous benefits to standardizing battery packs: engineers know where to locate them; the interconnections are defined; the unit cost will drop dramatically as the volume increases; technological progress is not tied to the vehicle, it just gives you more performance. You wouldn't necessarily have to buy the battery – currently a major cost factor in such vehicles. THE NEW SOLUTION This invention overcomes the shortcomings and solving some of the problems associated with large battery pack that exist today. The new vehicle's system replaces the huge battery pack with several standardized Portable Traction Batteries - PTB. Each PTB contains smaller/medium modulated electric energy source. The relatively small size and weight of these PTBs, allow driver to quickly exchange by himself the depleted PTB with charged ones at home or at gas station (which can have a small PTB exchange corner), in stand to charge the battery pack for few hours.
  • 3. 3 The illustration below describes the practical solution of the invention. The number of PTBs embarked in the car corresponds to the dally range. It is not necessary for the car owner to buy the vehicle with more batteries than necessary, because for long trips he can rent additional PTB from the gas station. We propose two PTB size: -Type A which can be transported and raised by hand having around 10 kg and 2 kWh of capacity (in this stage of development). -Type B which can be transported by some integrated wheels having around 25 kg and 5 kWh. Type A PTB and its vehicle interface are so designed to be mounted in seconds on the vehicle without to raise two much the battery from the ground: The three phases of mounting process are described In the pictures bellow:
  • 4. 4 When the PTB is mounted is also clipped in the vehicle interface. The vehicle interface can be a retractable drawer as can be sow in the upper picture or can be integrated on the lateral side of the vehicle, see the picture bellow. An anti theft measure are necessary and this can be ensured with an entire lockable cover or with a simple lockable straightedge (in red). This design is very cheap when compare with Matra or Gogoro solution to keep the costs as lower as possible. On the other hand the PTB can be raised only a little from the ground when is mounted and this require the most reduced effort on the market. Type B PTB can have the size twice larger than type A and can be used for larger vehicles as is presented in the picture bellow. The vehicle interface can be located anywhere around the vehicle and can be closed with a lockable cover. The opened cover is used also as an incline to raise easy the PTB on the vehicle by pushing.
  • 5. 5 Type B PTB, beside the wheels, presents a retractable handle which is retired after PTB takes its place on the vehicle. If the electric vehicle will be sold with a small number of PTBs, it will have an acceptable cost. In other case, one family can use a plurality of vehicles for different works (in case of a small farms) or for recreational purpose. If all these vehicles are with electric propulsion, several PTBs are sufficient for the entire family needs. The global cost of these vehicles can be with 30% lower than the current vehicle package cost. On the other hand, the farm or recreational vehicles are season vehicles. If a battery is permanently mounted and included in such vehicle, it remains in stand by for a long period and consequently can be deteriorated without using. In the case of the new solution the PTB can be moved from one vehicle to the other and the rate of utilization doesn’t depend from season succession. It can also be used as an auxiliary power unit at home, when is not employed to drive a vehicle. The charging of the PTB can be made from clean and renewable sources.
  • 6. 6 Return for customer Tesla Li-ion battery, made in its Gigafactory, costs around 300$/kW but is an exception. Usually price is around 500 $/kW. With the proposed standardization PTB can arrive easy at 200$/kW in today’s time. A small vehicle as a quadcycle, ATV, motorcycle, scooter, mini truck, mini tractor, electric boat, ski jet, snowboard, etc. can have a medium mass of around 500 kg. A big part of these vehicles are season vehicles and are not recommended for an electric propulsion because of battery degradation in the long period when is not used. On the other hand if each of these vehicles has its own battery becomes very expensive. So to use a standard movable battery of around 2 kWh having around 10 kg can be a good solution. The cost of this battery will be maximum 400 $. For a reasonable daily autonomy of between 30 and 50 km will be necessary around 4 kWh so are necessary two batteries having a cost of 800 $. We will compare the case when a customer or a small community (from emerging countries) holds three electric vehicles having the battery included in the vehicle and in the second case when the two batteries are bought for three vehicles sold without batteries. First case: Cost of vehicle 1 = 5.500 $ (2.000 $ for batteries) Cost of vehicle 2 = 5.500 $ (2.000 $ for batteries) Cost of vehicle 3 = 5.500 $ (2.000 $ for batteries) TOTAL COST = 16.500 $ Second case: Cost of vehicle 1 = 3.500 $ Cost of vehicle 2 = 3.500 $ Cost of vehicle 3 = 3.500 $ Cost of batteries = 800 $ TOTAL COST = 11.300 $ This means with 32 % less than in the first case. CNCLUSIONS The presented solutions have a number of benefits for both customer and manufacturer: -Easy to handle and transport; -Mounting and dismounting in seconds; -Very simple and cheap mounting adapter on the vehicle side; -High reliability construction and easy to be stored; -Decreases dramatically the total vehicle cost;
  • 7. 7 -Extension of the electrification to new vehicle classes; -Scalability of the battery structure; -Adaptability to different vehicles as well as for home usage. A new type of profitable business can be developed around this innovative concept. Also a new marketing concept can be associated with the future development. The invention is registered to the patent office. Contact e-mail: lgiurca@hybrid-engine-hope.com Phone: 0040731015778