CN103072488B - Composite power source - Google Patents

The invention relates to a composite power source, which is applied to a new-energy automobile. A super capacitor group is serially connected with a secondary battery group. When the discharging voltage of a power source system reaches the lower limit of the starting voltage of a motor, the electricity in the super capacitors is almost completely discharged, so the utilization rate of super capacitors is improved, and the cost of the power source system is reduced. Since the super capacitors are used, the usage amount of batteries is reduced, and the safety of the system is improved. The batteries are serially connected with the super capacitors in use, so the batteries can work in an optimum SOC (system-on-chip) area through the management of a power source management system, and the service life of each battery is prolonged.

A kind of composite power source

Technical field

The present invention relates to a kind of composite power source, can be used in new-energy automobile.

Background technology

The correlative study of ultracapacitor and greatly developing in recent years have complied with the demand of the mankind to novel energy, ultracapacitor is a kind of novel high-power energy storage device, compares battery, has larger power density values, compare traditional electrostatic condenser, there is higher energy density; There is abrupt release ultrahigh current characteristic simultaneously, charge discharge efficiency be high, have extended cycle life, performance that safety etc. is excellent, be widely used in new forms of energy industry in recent years, especially new-energy automobile and wind-powered electricity generation, photoelectricity store up defeated field.Existing new forms of energy car uses super capacitor or uses secondary battery or use super capacitor and cell parallel as car load propulsion source or auxiliary power source.

Use super capacitor as the new-energy automobile of propulsion source or auxiliary power source, because the specific energy of super capacitor is lower than battery, car load motor has again certain operating range requirement, when super-capacitor voltage is lower than electric motor starting voltage, the energy stored in super capacitor is not used and is wasted, have to again increase electric capacity quantity to meet car load energy requirement, integral vehicle cost is increased; Use battery as the new-energy automobile of propulsion source or auxiliary power source, owing to using number of batteries numerous, battery with two side terminals, safety, heat management, life-span etc. can not be guaranteed, and can not be widely used; Use super capacitor and cell parallel as the new-energy automobile of car load propulsion source or auxiliary power source, although played the advantage of the two, but the quantity of the two does not reduce, and safety etc. still can not be guaranteed, and car load power-supply system cost becomes higher.

Summary of the invention

The object of this invention is to provide a kind of composite power source, to solve because capacitive strike voltage drop is too fast in prior art, stored energy is not fully utilized, and causes power-supply system high cost, and battery use amount is too much, the power-supply system potential safety hazard caused becomes problem that the is large and lost of life.

For achieving the above object, the solution of the present invention is: a kind of composite power source, comprise one to be connected the super capacitor group formed by super capacitor, the secondary battery that a secondary battery or two or more secondary battery are in series, a secondary battery is connected with described super capacitor group; Or total secondary battery that plural secondary battery parallel connection is formed is connected with described super capacitor group.

Described composite power source also comprises power-supply management system, and for gathering the sampling setup of each monomer super-capacitor voltage and monomer secondary battery voltage, described sampling setup communication connects described power-supply management system.

Described composite power source comprise in parallel with described secondary battery, be the charging paths that super capacitor group is charged separately, in this charging paths, string is provided with the high-voltage relay that charges separately, and charge separately described in described power-supply management system control linkage high-voltage relay.

Described each secondary battery is all in series with corresponding control high-voltage relay, controls high-voltage relay described in described power-supply management system control linkage.

Described sampling setup is connected with power-supply management system communication by CAN.

The present invention adopts super capacitor group to connect with secondary battery, when power-supply system sparking voltage reaches electric motor starting lower voltage limit, make the electricity in super capacitor close to releasing completely, improve the degree of utilization of super capacitor, reduce the cost of power-supply system, decrease the use amount of battery owing to employing super capacitor, improve the safety of system.Battery is connected with super capacitor and is used, and can be made battery operated in best SOC district, extend the service life of battery by the management of power-supply management system.

Secondary battery can but to be not limited to be lead-acid battery, Ni-MH battery, lithium ion battery, lithium polymer battery etc., in order to coordinate the horsepower characteristic of super capacitor, above-mentioned secondary battery can adopt larger capacity batteries, also can adopt the mode that small-capacity cells is connected in parallel.

Not used time composite power source long period of super capacitor and serial battery, because super capacitor self-discharge is comparatively large, the electricity in super capacitor may not mate with the carrying capacity of battery, does not mate when power-supply management system detects, when car load charges to power-supply system, power-supply management system controls to charge separately high-voltage relay, switches charge circuit, charges separately to super capacitor, when super capacitor electricity reaches requirement, commutation circuit, super capacitor works together with battery, forms composite power source.

Accompanying drawing explanation

Fig. 1 is the schematic circuit diagram of embodiment 1;

The schematic circuit diagram of Fig. 2 embodiment 2.

Detailed description of the invention

Below in conjunction with accompanying drawing, the present invention will be further described in detail.

Embodiment 1

A kind of composite power source as shown in Figure 1, comprise one and to be connected the secondary battery formed by secondary battery by the connect super capacitor group that formed and one of super capacitor, secondary battery is connected with super capacitor group.Composite power source also comprises power-supply management system, and for gathering the sampling setup of each monomer super capacitor and monomer secondary battery voltage, sampling setup is connected by CAN communication with power-supply management system, power-supply management system can not only monitoring super capacitance voltage, secondary battery voltage, can also monitoring temperature, SOC, electric current etc.Secondary battery is in parallel with a charging paths, and this charging paths can bypass secondary battery, and for super capacitor group is charged separately, in this charging paths, string is provided with the high-voltage relay that charges separately.Power-supply management system control linkage is charged separately high-voltage relay.The main line of composite power source is also provided with control high-voltage relay, and when charging high-voltage relay disconnection separately, control high-voltage relay adhesive, composite power source discharges to external world as a whole or accepts charging.

Various operating modes below in conjunction with automobile illustrate the mode of operation of composite power source.

Operating mode 1: system does not use for a long time, use for the first time, by inner CAN line, power-supply management system detects that super-capacitor voltage group is too low, the SOC of secondary battery is moderate, power-supply management system sends charge request, car load charges to composite power source, after reaching regulation charging valtage, power-supply management system sends stopping charge request, and composite power source is in dormant state; When by inner CAN line, power-supply management system detects that secondary battery SOC is in upper control limit and super capacitor group voltage below level, power-supply management system controls high-voltage relay and disconnects, charging high-voltage relay is connected separately simultaneously, send charge request, the rechargeable energy that car load provides only is supplied to super capacitor group, super capacitor group voltage reaches in limited time, and power-supply management system sends stopping charge request, and composite power source is in dormant state.

Operating mode 2: when car load starts, composite power source exports electrical energy drive starter motor, drives driving engine or mair motor, car load is started.

Operating mode 3: during car load low cruise, composite power source drives mair motor, under pure motoring condition, car load is run, when power-supply management system detects that composite power source voltage is lower in limited time lower than setting, send charge request, engine starting, drive electrical generators generating is composite power source charging, composite power source voltage reaches and stops charging in limited time, continues to drive car load by composite power source.

Operating mode 4: when car load travels at the uniform speed, car load by engine drive, when power-supply management system detects composite power source low voltage, send charge request, driven by engine battery charger is the charging of whole composite power source, and after being charged to suitable voltage, composite power source is in dormant state.

Operating mode 5: when car load accelerates or climbing runs, composite power source drives mair motor to drive car load to accelerate together with driving engine or climbing.

Operating mode 6: when car load slows down or brakes, the electric energy that electrical generator produces is filled with in whole composite power source, reclaims energy.

Embodiment 2

As Fig. 2, when secondary battery does not mate with the self-discharge rate of super capacitor, in composite power source, multiple secondary battery can be set, connect with super capacitor group after secondary battery parallel connection.Each secondary battery is all in series with corresponding control high-voltage relay, and each high-voltage relay that controls all is controlled by power-supply management system.By controlling the opening and closing array mode that these control high-voltage relay, secondary battery and the super capacitor that can realize varying number combine; Also be conducive to maintenance, make can carry out a certain group of secondary battery separately during maintenance, system still can be powered.Multiple secondary battery is in parallel to improve the power out-put characteristic of secondary battery, avoids causing secondary battery to generate heat and the lost of life because electric current is excessive.

As other embodiments, if there is not self-discharge difference between super capacitor and secondary battery, then the composite power source high-voltage relay that can be unworthy of stand by power source management system and be controlled by power-supply management system.