Question: What is the name of the car company founded by Xia Heng that uses an energy storage device that can be recharged by plugging it in to an external source of electric power to power the vehicles?

Context articles: BYD ESS
Battery (electricity)
Flywheel storage power system
Xia Heng
Steam accumulator
Pumped-storage hydroelectricity
Plug-in hybrid
Plug-in electric vehicle
Accumulator (energy)
Hydraulic accumulator

BYD Energy Storage System(BYD ESS) is independently developed by the Chinese company BYD who begun with its battery manufacture business but later expands to diverse fields like new energy, EV etc., including energy type and power type.
 The energy type system can discharge for a long time, while the power type can supply big power for a short time.
 BYD Energy Storage System can realize, as the company announced, the function as below:frequency regulation, substation grid support, distributed energy storage system (DESS), PV/Wind integration, commercial energy management etc.
An electric battery is a device consisting of one or more electrochemical cells with external connections provided to power electrical devices such as flashlights, smartphones, and electric cars.
 When a battery is supplying electric power, its positive terminal is the cathode and its negative terminal is the anode.
 The terminal marked negative is the source of electrons that when connected to an external circuit will flow and deliver energy to an external device.
 When a battery is connected to an external circuit, electrolytes are able to move as ions within, allowing the chemical reactions to be completed at the separate terminals and so deliver energy to the external circuit.
 It is the movement of those ions within the battery which allows current to flow out of the battery to perform work.
 Historically the term "battery" specifically referred to a device composed of multiple cells, however the usage has evolved additionally to include devices composed of a single cell.
A flywheel-storage power system uses a flywheel for energy storage, (see Flywheel energy storage) and can be a comparatively small storage facility with a peak power of up to 20 MW.
 It typically is used to stabilize to some degree power grids, to help them stay on the grid frequency, and to serve as a short-term compensation storage.
 Unlike common storage power plants, such as the pumped storage power plants with capacities up to 1000 MW, the benefits from flywheel storage power plants can be obtained with a facility in the range of a few kW to several 10 MW.
 They are comparable in this application with battery storage power plants.
Henry Xia or Xia Heng (Chinese: 夏珩，born 07 Nov, 1983） is a Chinese entrepreneur.
 He co-founded the Chinese Plug-in gas-electric hybrid car company Xiaopeng Motor.
A steam accumulator is an insulated steel pressure tank containing hot water and steam under pressure.
 It is a type of energy storage device.
 It can be used to smooth out peaks and troughs in demand for steam.
 Steam accumulators may take on a significance for energy storage in solar thermal energy projects.
 An example is the PS10 solar power tower plant near Seville, Spain and one planned for the "solar steam train" project in Sacramento, California.
Pumped-storage hydroelectricity (PSH), or pumped hydroelectric energy storage (PHES), is a type of hydroelectric energy storage used by electric power systems for load balancing.
 The method stores energy in the form of gravitational potential energy of water, pumped from a lower elevation reservoir to a higher elevation.
 Low-cost surplus off-peak electric power is typically used to run the pumps.
 During periods of high electrical demand, the stored water is released through turbines to produce electric power.
 Although the losses of the pumping process makes the plant a net consumer of energy overall, the system increases revenue by selling more electricity during periods of "peak demand", when electricity prices are highest.
A plug-in hybrid electric vehicle (PHEV) is a hybrid electric vehicle that uses rechargeable batteries, or another energy storage device, that can be recharged by plugging it in to an external source of electric power.
 A PHEV shares the characteristics both of a conventional hybrid electric vehicle, having an electric motor and an internal combustion engine (ICE), and of an all-electric vehicle, having a plug to connect to the electrical grid.
 Most PHEVs are passenger cars but there are also PHEV versions of commercial vehicles and vans, utility trucks, buses, trains, motorcycles, scooters, and military vehicles.
A plug-in electric vehicle (PEV) is any motor vehicle that can be recharged from an external source of electricity, such as wall sockets, and the electricity stored in the rechargeable battery packs drives or contributes to drive the wheels.
 PEV is a subset of electric vehicles that includes all-electric or battery electric vehicles (BEVs), plug-in hybrid vehicles (PHEVs), and electric vehicle conversions of hybrid electric vehicles and conventional internal combustion engine vehicles.
 In China, plug-in electric vehicles are called new energy vehicles (NEVs).
An accumulator is an energy storage device: a device which accepts energy, stores energy, and releases energy as needed.
 Some accumulators accept energy at a low rate (low power) over a long time interval and deliver the energy at a high rate (high power) over a short time interval.
 Some accumulators accept energy at a high rate over a short time interval and deliver the energy at a low rate over longer time interval.
 Some accumulators typically accept and release energy at comparable rates.
 Various devices can store thermal energy, mechanical energy, and electrical energy.
 Energy is usually accepted and delivered in the same form.
 Some devices store a different form of energy than what they receive and deliver performing energy conversion on the way in and on the way out.
A hydraulic accumulator is a pressure storage reservoir in which a non-compressible hydraulic fluid is held under pressure that is applied by an external source.
 The external source can be a spring, a raised weight, or a compressed gas.
 An accumulator enables a hydraulic system to cope with extremes of demand using a less powerful pump, to respond more quickly to a temporary demand, and to smooth out pulsations.
 It is a type of energy storage device.