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
Transcripts - Portable taction battery_for_cheap_electric_vehicles
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.
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
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.
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
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.
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
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.
Type B PTB, beside the wheels, presents a retractable handle which is retired after PTB takes its place on
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.
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.
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 $
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.
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;
-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: firstname.lastname@example.org