39results about How to "Large balance current" patented technology

The invention relates to a charge-discharge equalizing circuit of a multi-monomer tandem dynamic lithium battery, comprising a master control module and a group of equalizing modules, wherein the group of equalizing modules are communicated with the master control module and correspondingly connected with a group of monomer batteries which are sequentially connected in series; each equalizing module comprises a flyback transformer, two switches and one or more than two parallel capacitor banks; one winding of the flyback transformer of each equalizing module is connected with the positive and negative poles of the corresponding monomer battery; the capacitor banks of each equalizing module are connected with the winding in parallel; the other winding is connected with the positive and negative poles of the monomer battery which is adjacent to and sequentially connected to the above monomer battery; and each winding return circuit is connected with one switch in series. The equalizing circuit realizes energy balance among all the monomer batteries, has the advantages that the equalization is lossless, the equalizing current is large, the equalizing efficiency is high, the expandability is good and the implementation is easy, and the purposes of quick large-current charging, enhancement of battery safety performance, improvement of discharging capacity and service life of the batteries and the like can be realized.

The invention discloses a battery management system and balance method with a parallel balance function. The battery management system comprises a battery pack with 24 lithium ion batteries, six single chip microcomputer-based battery monitoring modules, a main controller, six single battery gating modules, an active balance module, a communication module, a charge-discharge protection apparatus and a battery module. By virtue of the battery management system, monitoring and control for 24 batteries can be realized, and functions of monitoring the working parameters of the single batteries, and performing passive balance, active balance, parallel balance, charge-discharge overcurrent protection and upper computer communication and the like of the battery pack can be realized; meanwhile, the size of a balanced current also can be regulated, and intelligent balance can be realized; by virtue of the system, a switch matrix driver and a common power supply switch controller can be omitted; the driving of an MOSFET transistor of each single battery gating module is completed by the battery monitoring module; and the driving of an MOSFET transistor of the active balance module is completed by the main controller, so that the intelligent charge-discharge function of the balanced current controlled by software is realized.

The invention discloses a power battery pack equalization circuit based on boost conversion and soft switching, and a realization method of the equalization circuit. The equalization circuit mainly comprises a microcontroller, a switching module, a BOOST conversion module and an LC (inductance-capacitance) resonance circuit, wherein the microcontroller gates battery monomers with maximum voltage and minimum voltage in any position of a battery pack on an equalization bus according to battery monomer numbers corresponding to maximum monomer voltage and minimum monomer voltage; and the microcontroller sends a pair of state-complementary PWM (pulse-width modulation) signals to control the LC resonance circuit, so that the LC resonance circuit alternately operates in charging and discharging states. The equalization circuit and the realization method effectively solve the problem that zero voltage difference of the battery monomers cannot be realized easily due to conduction voltage drop of electric and electronic devices; equalization current is increased; the equalization time is shortened; zero current switching equalization is realized; energy waste is reduced; the inconsistency among the battery monomers is improved effectively; and the equalization efficiency is improved.

The invention discloses a relay switching-based lithium battery pack non-dissipative equalizing device, belongs to the technical field of battery protection and aims to provide the relay switching-based lithium battery pack non-dissipative equalizing device which has the advantages of high equalizing current, short equalizing time and high equalizing efficiency. The device comprises a battery pack, a current/current conversion unit, a plurality of double-pole relays and a detection control unit which are connected in series or parallel, wherein an input end of the current/current conversion unit is connected with the positive electrode and the negative electrode of the battery pack, while the output end is a path of isolated direct current power; one end of a normally open contact of each double-pole relay is connected in parallel with the positive electrode and the negative electrode of the output end of the current/current conversion unit respectively; the normally open contact at the other end is correspondingly connected with the positive electrode and the negative electrode of each single battery in the battery pack respectively; and the positive electrode and the negative electrode of each single battery in the battery pack are connected to the detection control unit through voltage detection flat cables respectively. High equalization of each single battery in the battery pack can be ensured by the device.

The invention provides an energy storage system, a balance control method of the energy storage system and a photovoltaic power generation system, and relates to the technical field of energy storage systems. The energy storage system comprises a controller and three power conversion branches. Each power conversion branch comprises a power conversion circuit, or each power conversion branch comprises at least two power conversion circuits which are connected in series. The second end of each power conversion circuit is connected with at least one battery cluster; each battery cluster comprises at least two energy storage modules which are connected in series, and each energy storage module comprises a direct current/direct current conversion circuit and a battery pack; the output end of each battery pack is connected with the input end of the corresponding DC/DC conversion circuit, and the output ends of the DC/DC conversion circuits are connected in parallel with the equalization bus. And the controller controls each DC/DC conversion circuit, so that the electric quantity of each battery pack in the battery cluster is balanced. By means of the scheme, the electric quantity balance capacity of the energy storage system is improved, and the influence of the battery short-plate effect is relieved.

The invention discloses a cell equalization apparatus possessing a heating function. The cell equalization apparatus possessing the heating function comprises a plurality of independent cell module equalization circuits corresponding to a cell module. Each cell module equalization circuit comprises an equalization control switch and an equalization resistor which are connected in series. The equalization resistor is a thin-sheet-type large power heating resistor which can be used to heat a cell. The thin-sheet-type large power heating resistor is formed by an insulation heat conduction thin sheet and a heating wire arranged in the insulation heat conduction thin sheet. The thin-sheet-type large power heating resistor is fixed to a cell module sidewall or a bottom surface and is tightly and uniformly contacted with a monomer cell shell used for forming the cell module. The cell equalization apparatus possessing the heating function can be served as a heating unit of cell system heat management under a low temperature environment and also can be served as the equalization resistor under a normal temperature environment. Equalization resistor power in the equalization apparatus is large, equalization efficiency is high and a temperature rise of the equalization resistor during equalization is small.

The invention discloses a battery pack equalizing circuit and method. The circuit comprises a battery pack, a voltage collecting module used for collecting the voltage of single batteries in the battery pack, a switch switching module, a control module and at least one bidirectional DC-DC module, and the bidirectional DC-DC module is connected with the battery pack. The control module is used for judging whether the single batteries need to be equalized or not according to the collected voltage of the single batteries; when the judgment result is that the single batteries need to be equalized, the switch switching module is controlled to enable the single batteries needing to be equalized to be connected with the bidirectional DC-DC module, and then the bidirectional DC-DC module is controlled to enable energy to flow among the battery pack and the single batteries needing to be equalized. The battery pack equalizing circuit and method have the advantages that the radiating aim is achieved, the equalizing current is large, the equalizing speed is high, and the energy utilization rate is high. The battery pack equalizing circuit and method can be widely applied to the field of battery management.

The invention discloses a welding-free connector electrically connected with a battery cell and a lithium ion battery. The welding-free connector comprises a current collecting bar, the current collecting bar is clamped with a connecting plate, the connecting plate comprises a back plate and clamping columns fixedly arranged on one side of the back plate at intervals, and a groove used for being clamped with the current collecting bar is formed between every two adjacent clamping columns; the periphery of the clamping column or the inner side wall of the groove is coated with a thermal decomposition material layer, and the thermal decomposition material layer is formed by compounding heat-sensitive resin and a modified material; and the back plate and the clamping columns are made of high-thermal-conductivity insulating materials. According to the invention, the electric connection connector assembly composed of the current collecting bar and the connecting plate connected with the current collecting bar in a matched manner is adopted, and has certain mechanical strength and good heat conduction capability at normal temperature. When a short circuit occurs, the heat-sensitive resinin the thermal decomposition material layer coated on the connecting plate is decomposed by heating, so that the pre-tightening force between the battery cell tab and the connecting sheet disappears,the connection between the battery cells is disconnected, the thermal runaway is prevented, and the safety of the battery is greatly improved.

The invention discloses a battery pack equalizing device with a radiating function. The battery pack equalizing device comprises a direct current / direct current conversion module, a detection control module, a plurality of double-pole relays, a radiating fan and a battery pack, wherein two common ends of each double-pole relay are respectively connected with an anode and a cathode of an input end of the direct current / direct current conversion module; two normally-closed ends of each double-pole relay are opened; two normally-open ends of each double-pole relay are respectively connected to the anode and the cathode of each single battery in the battery pack; an output end of the direct current / direct current conversion module is connected with the radiating fan; and the detection control module is connected to the anode and the cathode of each single battery in the battery pack through a voltage detection flat cable. The battery pack equalizing device with the radiating function has the advantages that: by discharging a single battery with the highest voltage in the battery pack through the fan, equalized heating cannot be caused, the radiating function of the battery pack can be realized, equalizing current can be freely regulated, and the equalizing current can be increased by improving the output power of the direct current / direct current conversion module and the power of the fan.

A battery voltage equalization device is used for voltage equalization of batteries in a battery pack, and the respective batteries have an equal charge cutoff voltage U. The battery voltage equalization device comprises N+1 switches, an isolated bidirectional DCDC converter and a battery management system, wherein the isolated bidirectional DCDC converter has an energy storage unit, the input/output voltages of the isolated bidirectional DCDC converter are respectively N*U and U, and the battery management system is configured to monitor the voltage of each battery in real time, further determine whether the voltage of each battery is higher than "U-0.03V" when batteries with unbalanced voltages are detected, stops working if so, otherwise calculating the absolute value (FORMULA referred)of the difference between the voltage U' of each battery with unbalanced voltage and the average voltage (FORMULA referred) of N batteries, arranging all the batteries with unbalanced voltages into asequence S in the order of large to small, and charging or discharging the batteries to be equalized in the sequence S respectively by a battery management system according to the condition of under-voltage or over-voltage.

The invention discloses a quasi-resonant staggered switched capacitor battery equalization circuit and a control method thereof. The equalization circuit comprises a battery pack 1, a battery pack 2,an equalization subcircuit 1, an equalization subcircuit 2 and an equalization subcircuit 3; the battery packs composed of 2n batteries in series connection are divided into the battery pack 1 and thebattery pack 3; the equalization subcircuit 1 is connected with the battery pack 1, the equalization subcircuit 2 is connected with the battery pack 2, and the equalization subcircuit 3 is connectedwith the battery pack 1 and the battery pack 2. A pair of drive signals with fixed frequency, supplementary duty ratio and dead time are used for controlling the connection and disconnection of switchtubes inside the equalization subcircuit 2 and the equalization subcircuit 3 in the equalization subcircuit 1, the energy of high-voltage batteries is transmitted to low-voltage batteries through equalization capacitors, and automatic equalization for the voltage of each battery is realized. The equalization path between any two batteries is shortened, and two equalization passages are provided for any two batteries incapable of direct equalization, so that the influence of battery quantity on equalization speed is eliminated.

The invention relates to an active equalizer circuit of a lithium cell pack. The active equalizer circuit comprises a DC/DC (Direct-Current/Direct-Current) converter and a switch array, wherein the switch array is composed of four groups of switches which are correspondingly connected with monomer cells in the lithium cell pack; one ends of the first group of switches are connected with the positive electrodes of the monomer cells respectively, and the other ends of the first group of switches are in short circuit and are connected with the input positive end of the DC/DC converter; one ends of the second group of switches are connected with the negative electrodes of the monomer cells respectively, and the other ends of the second group of switches are in short circuit and are connected with the input negative end of the DC/DC converter; one ends of the third group of switches are connected with the positive electrode of the monomer cells respectively, and the other ends of the third group of switches are in short circuit and are connected with the output positive end of the DC/DC converter; and one ends of the fourth group of switches are connected with the negative electrodes of the monomer cells respectively, and the other ends of the fourth group of switches are in short circuit and are connected with the output negative end of the DC/DC converter. The active equalizer circuit has the main function that the direct bidirectional energy conversion between any two monomer cells is realized, thereby achieving the purpose of equalizing the electric quantity of all monomers ultimately.

The invention discloses an integrated high-temperature decomposition connector and a lithium ion battery comprising the same. The integrated high-temperature decomposition connector comprises a connecting plate and supporting columns fixedly arranged on one side of the connecting plate at intervals, clamping columns are fixedly connected to the top ends of the supporting columns, and an insertinggroove is formed between every two adjacent clamping columns; the top end face of the clamping column and the inner side wall of the inserting groove are each provided with a conductive layer; the clamping column is made of a high-temperature decomposition material; and the high-temperature decomposition material is formed by mixing heat-sensitive resin and a functional additive. The connector disclosed by the invention is composed of two parts, namely high-temperature-decomposed thermosensitive resin and a conductive layer. The conductive layer can be electrically connected with a battery cell tab, and the thermosensitive resin can be automatically decomposed when the temperature of the battery cell is too high, so that the conductive layer on the surface layer collapses, an electric connection effect is not generated, further thermal runaway of the battery cell can be prevented, and the safety performance of the battery is greatly improved.

The invention relates to a battery charging balance and overvoltage alarm circuit and a control method thereof. The charging balance and overvoltage alarm circuit comprises a plurality of charging balance and overvoltage alarm circuits, and the battery detection end of each charging balance and overvoltage alarm circuit is connected with each single battery connected in series in a battery pack; the charging balance and overvoltage alarm circuit comprises a single-chip microcomputer, a three-terminal voltage-regulator tube, a photoelectric coupler, a light-emitting diode, first to sixth resistors and a field-effect tube. Wherein, the second resistor and the three-terminal voltage stabilizing tube provide reference voltage, the single-chip microcomputer performs battery voltage detection, indication and control functions, the light emitting diode and the third resistor perform balance work state indication, the fourth resistor and the photoelectric coupler perform a battery overvoltagealarm function, and the field effect transistor, the fifth resistor and the sixth resistor perform a balance discharge function. According to the invention, voltage balance of all single batteries inthe battery pack can be completed, it is ensured that all single batteries are not overcharged, the safety is improved, and the overall service life of the battery pack is prolonged.

The invention discloses a two-way no-wear equalization circuit based on a normal shock DC (Direct Current) /DC convertor. The two-way no-wear equalization circuit comprises a battery group, a positive electrode-negative electrode switching circuit, a matrix switch circuit, a voltage collection circuit and a vehicle-mounted 24V lead-acid battery, which are connected in series, wherein the input end of the normal shock DC/DC convertor is connected with the vehicle-mounted 24V lead-acid battery, and the output end of the normal shock DC/DC convertor is connected with the positive electrode-negative electrode switching circuit; one end of the matrix switch circuit is connected with the positive electrode and the negative electrode of each battery monomer of the battery group, and the other end of the matrix switch circuit is connected with the positive electrode-negative electrode switching circuit; and one end of the voltage collection circuit is connected with the corresponding battery monomer of the battery group through a voltage detection flat cable, the other end of the voltage collection circuit is accessed to a main control module, and the control signals of the normal shock DC/DC convertor, the positive electrode-negative electrode switching circuit and the matrix switch are respectively accessed into the main control module. The two-way no-wear equalization circuit provided by the invention has the advantages that the equalization current is high, the equalization time is shortened, the equalization efficiency is improved, the circuit design is simple, the cost is low, the volume is small, and the two-way no-wear equalization circuit is easy to realize.

The invention discloses a two-way distributed power battery equalization management system which comprises a battery pack, a control module, an equalization module, a data acquisition module and an upper computer. The control module comprises a microprocessor and an insulation monitoring unit which are electrically connected, and the equalization module comprises an active equalization circuit. The invention further provides a two-way distributed power battery equalization management method. The method includes the steps that the microprocessor sets a safety threshold value Vs of the voltage difference between single power batteries; the insulation monitoring unit detects whether a bus or a connecting branch of the battery pack leaks electricity or not; the data acquisition module acquirescharging and discharging current and voltage information of the single power batteries; and the microprocessor judges whether the voltage difference of any two single power batteries exceeds the safety threshold value or not and whether the battery pack leaks electricity or not. Equalization management of the multiple single power batteries is achieved, and the equalization management system is small in equalization error and high in equalization efficiency.