Electric vehicle lithium battery bag
Technical field
The present invention relates to a kind of power supply on vehicle, especially a kind of electric vehicle lithium battery bag.
Background technology
2012, global electric automobile (comprising PHEV and EV) sales volume reached 12.96 ten thousand, was almost doubled compared with 6.8 ten thousand of this electric automobile commercialization first year in 2011.Although still not worth mentioning compared with orthodox car up to tens million of amount sales volumes, for these new things of electric automobile, within 2 years, can obtain such achievement or all well and good.A few years from now on whole world electric automobile market will be shown greatly the speed of doubling every year and up increase, to global electric automobile year in 2015 sales volume will break through 1,000,000.
Existing electric vehicle lithium battery bag, can select power lithium battery module or capacity type lithium battery module conventionally, for power lithium battery module, have compared with large current discharging capability, but specific energy is little, and difficulty meets the requirement of electric motor car distance travelled to capacity; For capacity type lithium battery module, there is higher specific energy, but difficulty is born heavy-current discharge, and battery easily generates heat, affect the life-span of battery, be prone to potential safety hazard.
If select electric vehicle power lithium battery module, especially ultracapacitor, its specific energy is low, and cost is high, can not meet the requirement of the distance travelled of electric motor car.
If select electric vehicle capacity type lithium battery module, because of large current discharging capability relative mistake, be prone to battery pack temperature and rise, and inhomogeneous, cause the problems such as the short and potential safety hazard of battery life; .
If select the lithium battery module of power in electric vehicle, though take into account power and capacity characteristic, difficulty meets the distance travelled of electric motor car, the requirement of power and cost at present.
Summary of the invention
The deficiency requiring in order to overcome the current discharge ability of cannot taking into account, specific energy and the distance travelled of existing electric vehicle lithium battery bag, the invention provides one and take into account current discharge ability and specific energy, effectively meet the electric vehicle lithium battery bag that distance travelled requires.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of electric vehicle lithium battery bag, comprise power-type module and the jumbo capacity type lithium battery group of low capacity, the positive pole of described power-type module is connected with the positive pole of described capacity type lithium battery group, and the negative pole of described power-type module is connected with the negative pole of described capacity type lithium battery group; The nominal voltage of described power-type module is not less than the nominal voltage of capacity type lithium battery module, and described power-type module can be born the maximum charging voltage that the ceiling voltage of charging can bear higher than capacity type module; Described power-type module is in parallel with equalizing circuit, and described capacity type lithium battery group is connected with current-limiting circuit.
Further, described power-type module is super capacitor module or power lithium battery module.
Further again, described negative or positive electrode is connected in series successively with circuit breaker, relay.
Further, described capacity type lithium battery module is connected with protective circuit.
Described power-type module be connected in order to the first Acquisition Circuit that gathers voltage and temperature signal.
Described capacity type lithium battery group be connected in order to the second Acquisition Circuit that gathers voltage and temperature signal.
Beneficial effect of the present invention is mainly manifested in: 1) adopt the power-type module of low capacity and the lithium battery bag of jumbo capacity type lithium battery module formation in parallel, take into account power and capacity characteristic, meet applying working condition and the cost requirement of electric motor car; 2) employing power-type module, all the time in underfill state in charging process, improves charge efficiency, temperature rise while reducing charging; 3) capacity type lithium battery module gathers and voltage balance circuit with signal (voltage and temperature), and major loop is with threshold currents device and circuit, and controlled discharge electric current extends life-span of lithium battery bag; 4) lithium battery band has relay and fuse unit, improves the fail safe of lithium battery bag.
Accompanying drawing explanation
Fig. 1 is a kind of schematic diagram of electric vehicle lithium battery bag.
Fig. 2 is the schematic diagram of another kind of electric vehicle lithium battery bag.
Fig. 3 is the schematic diagram of another electric vehicle lithium battery bag.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
With reference to Fig. 1 ~ Fig. 3, a kind of electric vehicle lithium battery bag, comprise power-type module 2 and the jumbo capacity type lithium battery group 1 of low capacity, the positive pole of described power-type module 2 is connected with the positive pole of described capacity type lithium battery group 1, and the negative pole of described power-type module 2 is connected with the negative pole of described capacity type lithium battery group 1; The nominal voltage of described power-type module 2 is not less than the nominal voltage of capacity type lithium battery module 1, and the described power-type module 2 charging ceiling voltage that can the bear maximum charging voltage that can bear higher than capacity type module 1; Described power-type module 2 is connected with equalizing circuit, and described capacity type lithium battery group 1 is connected with current-limiting circuit.
Further, described power-type module 2 is super-capacitor module or power lithium battery module, and wherein Fig. 1 and Fig. 2 are super-capacitor module, and Fig. 3 is power lithium battery module.
Further again, described negative or positive electrode is connected in series successively with circuit breaker, relay.
Further, described capacity type lithium battery module 1 is connected with protective circuit.
Described power-type module 2 be connected in order to the first Acquisition Circuit that gathers voltage and temperature signal.
Described capacity type lithium battery group 1 be connected in order to the second Acquisition Circuit that gathers voltage and temperature signal.
In the present embodiment, a power-type module 2 jumbo capacity type lithium battery module 1 in parallel of low capacity, forms an electric vehicle lithium battery bag;
Power-type module 2 possesses good large current density power and the resistance to exoergic power of crossing;
The nominal voltage of power-type module 2 is not less than the nominal voltage of capacity type lithium battery module 1, and the charging voltage that can bear higher than capacity type module 1 of the charging voltage that can bear of power-type module 2.In the charging later stage, allow power-type module in underfill state, improve the charge efficiency of lithium battery bag, reduce the temperature in charging process.
Capacity type lithium battery module 1 has high-energy-density and safety features, meets the requirement of electric motor car distance travelled to discharge energy.
Power-type module 2 is with first signal Acquisition Circuit and equalizing circuit in order to gather voltage and temperature; Capacity type lithium battery module 1, with secondary signal Acquisition Circuit and protective circuit in order to gather voltage and temperature, with major loop threshold currents device and circuit, is controlled its discharging current size.
Whole electric vehicle lithium battery band has circuit breaker, relay and fuse unit, improves the fail safe of lithium battery bag.