40results about How to "Uniform charge and discharge" patented technology

Disclosed is a device carrying out whole-course, real-time and comprehensive monitoring, such as parameter detection, analysis, learning, control, display, external communication and the like, for the charging-discharging process of a lithium battery pack, namely an intelligent management system for power lithium batteries, which mainly comprises a voltage detection device, a current detection device for detecting electric current in the process of charging and discharging of the lithium battery pack, a temperature detection device, a control device, a charging-discharging state judgment device, a computing device, a data storage device, a parameter correction device, an automatic learning device, a data display device, a communication device, a protection device, a system automatic diagnosis device and an alarm display device. Further disclosed is a device (instrument) for detecting the performance of the lithium battery, which mainly comprises a voltage detection device, a current detection device, a temperature detection device, a control device, a computing device, a data storage device, a parameter correction device, a residual capacity judgment device, a data display device, a communication device, a protection device, a system automatic diagnosis device and an alarm display device.

The invention discloses a control method and a device for achieving equalizing charge of a battery pack and a battery box. The control method for achieving the equalizing charge of the battery pack comprises periodically checking battery status signals of the battery pack, wherein the battery status signals comprise a battery state of charge (SOC), internal resistance, a voltage, a current and / or temperature, judging whether batteries in the battery pack need conducting equalizing charge or not according to the battery status signals, and if the batteries need conducting the equalizing charge, then the equalizing charge is conducted to the batteries through an equalization unit connected with the batteries. According to the control method and the device for achieving the equalizing charge of the battery pack and the battery box, the battery status signals such as the battery SOC, the internal resistance, the voltage, the current, the temperature and the like can be combined, the actual state equilibrium of the batteries is achieved, a switch topological structure and control are high in efficient and stability, the size of a magnetic element is greatly reduced, and achieving by using an integrated circuit can be easily achieved.

The invention provides a charge and discharge active equalization circuit of a lithium-ion power battery pack, and belongs to the technical field of battery charge and discharge. The charge and discharge active equalization circuit comprises a charge and discharge active equalization circuit body between battery cells and a charge and discharge active equalization circuit body among a battery module, the battery cells and an external power source. The two charge and discharge active equalization circuit bodies are based on a supercapacitor. A battery cell selection circuit is used for selecting the battery cells about to be subjected to voltage equalization. A reversing circuit and the supercapacitor are used for carrying out voltage equalization management on the selected battery cells. The charge and discharge active equalization circuit body among the battery module, the battery cells and the external power source is used for achieving charge and discharge active equalization management among the battery module and the battery cells, charge and discharge active equalization management among the external power source and the battery cells and charge and discharge active equalization management between the external power source and the battery module. The equalization circuit is simple and reliable in equalization process, easy to control and fast and efficient in active equalization process, the charge state and the discharge state of a battery can be effectively managed, and then the service life of the battery is prolonged.

The invention provides a charge-discharge system and a charge-discharge method for a mobile power supply. The charge-discharge system comprises a load detection unit, a charge unit, a discharge unit and a control unit, wherein the load detection unit is used for detecting whether the mobile power supply is connected with a load or not; the charge unit is used for outputting a charge current to charge the battery of the mobile power supply; the discharge unit is used for outputting a discharge current to discharge to the load; and the control unit is used for receiving an input current and adjusting the charge current output by the charge unit and the discharge current output by the discharge unit according to the magnitude of the input current and the discharge current. Therefore, a beneficial effect of synchronous charging and discharging, and the balancing of the charge-discharge currents is realized.

The invention relates to a battery pack balance protecting system and method. The battery pack balance protecting system comprises a lithium battery pack, a control circuit, a main circuit and shunt discharging subcircuits. The main circuit is connected with the control circuit through a charging control switching element and a discharging control switching element. The shunt discharging subcircuits are connected to the control circuit. Single lithium batteries in the lithium battery pack are in series connection. The control circuit comprises over-current detection protecting resistors, lithium battery protecting chips, an MOS (metal oxide semiconductor) used for charging control and an MOS used for discharging control. Pins CO of the single lithium battery protecting chips of the lithium battery pack are connected to the MOS used for charging control, respectively. Pins DO of the lithium battery protecting chips are connected to the MOS used for discharging control, respectively. Pins VM of the lithium battery protecting chips are connected to the main circuit through the over-current detection protecting resistors. Shunt discharging subcircuits of the lithium batteries are in series connection to pins VDD and pins VSS of the corresponding lithium battery protecting chips.

An automatic testing system for battery equalization module packing comprises a PC (personal computer), an automatic test main control panel, at least one direct-current programmable power supply and a test table for holding equalization module packing panels, wherein multiple equalization modules are connected with the inside of the test table, the automatic test main control panel is electrically connected with the PC, the at least one direct-current programmable power supply and the test table for holding the equalization module packing panels respectively, the automatic test main control panel controls control connection lines used for connection with the test table to be connected and disconnected, whether each equalization module passes a test is judged by testing changes of voltage and currents of each control connection line, and accordingly whether performance of the equalization modules on the packing panels is qualified in different states is tested. The measurement accuracy and efficiency of the automatic testing system in voltage, current and other data are multiplied compared with a traditional manual testing mode, and the quality of ex-factory products can be improved.

The invention relates to preparation method and application of a stainless steel net-loaded SnO2/SnS2 nanosheet potassium ion battery negative electrode composite material. The preparation method comprises the steps of dissolving sodium hydroxide in certain mass into deionized water to obtain a solution A; adding tin chloride into the solution A to obtain a solution or emulsion B under stirring ofa magnetic force; transferring the solution B to a hydrothermal reaction kettle, placing a stainless steel net which is cleaned in advance in the solution B, performing hydrothermal reaction, performing cooling after reaction is ended, and cleaning the stainless steel net with the deionized water and ethyl alcohol to obtain a stainless steel net-loaded tin oxide nanometer-structure precursor; andplacing the stainless steel net-loaded tin oxide nanometer-structure precursor in a solution containing a sulfur source, performing reaction for certain time under a certain temperature, cleaning with the deionized water and the ethyl alcohol, and drying under the certain temperature to obtain the stainless steel net-loaded SnO2/SnS2 nanosheet-shaped structure. By the preparation, the conductivity of a potassium ion battery is improved, meanwhile, the error of paste mixing and coating processes is omitted, and the situation that the test performance of the battery is affected by application of a binding agent is prevented.

The invention provides an online distributed storage battery pack monitoring device which comprises a battery gathering module, a dynamic environment monitoring center, battery modules and a Hall sensor. The input end of the Hall sensor is connected to a charging and discharging loop of a storage battery pack in series, and the output end of the is connected to a current collecting input end of the battery gathering module; the input ends of the battery modules are connected to the positive and negative ends of tested batteries of the storage battery pack correspondingly, and the output ends of the battery modules are connected to the input end of the battery gathering module via a communication and control bus; and a voltage collecting input end of the battery gathering module is connected to a terminal voltage detection line of the storage battery pack, and the output end of the battery gathering module is connected to the input end of the dynamic environment monitoring center. The monitoring device can monitor the voltage, internal resistance and temperature of tested batteries in an integrated way, and the problem that hidden fault troubles of the lead acid batteries cannot bediscovered and solved timely is solved via an unmanned and onsite networking manner.

The invention discloses a series battery pack direct equalization method based on a converter. An equalization circuit on which the direct equalization method is based comprises a series battery pack,2n + 3 MOS transistors, 2n + 5 diodes, two flyback converters and an RCD buffer circuit. The series battery pack is composed of n single batteries. The circuit is characterized in that: (1) the wholeequalization circuit only needs two flyback converters for energy transfer, and the size is small; (2) the expansion is easy, and when the number of the single batteries included in the series battery pack is changed, only the corresponding MOS transistors need to be added; and (3) equalization control strategies of the charging and discharging processes of the series battery pack are combined into one, and in the charging and discharging processes, discharging equalization of the single battery with the maximum terminal voltage and charging equalization of the single battery with the minimumterminal voltage are realized simultaneously.

The invention discloses a balanced output system based on a multi-winding transformer. The system comprises a battery unit module, a multi-winding transformer, two groups of switch tubes, a controller and a filter module, and when the output is carried out, the controller generates a PWM signal with a fixed duty ratio to drive a primary side switch tube and control a secondary side switch tube to be in an off state; equalization of the battery pack is achieved through forward excitation, and a secondary side output function is achieved through flyback excitation; and when the battery unit module is charged, the controller generates the PWM signal with the fixed duty ratio to drive the secondary side switch tube, the primary side switch tube is controlled to be in an off state, and the function of charging the primary side battery unit module is achieved through flyback. The multi-winding transformer is used for balancing the battery unit modules, the secondary side of the transformer is used for achieving external output, the available capacity of the battery pack is improved, the service life of the battery pack is prolonged, and meanwhile the integration level of a balance system is improved.

The present application discloses a container energy storage joint operation system and method. The system comprises a plurality of energy storage terminals, and each of the energy storage terminals comprises an energy management system, a first power conversion system, a second power conversion system and an energy storage unit. The energy management system is communicably connected to the firstpower conversion system and the second power conversion system, respectively, wherein the DC side of the first power conversion system is respectively connected to the energy storage unit and the DC side of the second power conversion system. The energy storage unit at least comprises a storage battery, wherein each AC side of the second power conversion systems is respectively connected to a common AC grid through a circuit breaker, and the energy management systems of all the energy storage terminals are in communication connection. The system of the invention can realize balanced charging and discharging and uniform load on a plurality of container energy storage terminals, thereby making the system more flexible and more convenient, and improving economic benefits.

The invention provides an energy storage battery charging and discharging method considering the balance of a battery pack of a distributed energy storage system and a charging and discharging control system. The energy storage battery charging and discharging method comprises the following steps: collecting current and voltage data of each node of a distributed energy storage system, and calculating power needing to be absorbed/emitted by the energy storage system and SOC of each battery pack; according to the SOC of each battery pack, calculating the maximum power borne by the battery pack during balanced charging and discharging; after the BMS cuts off or accesses part of the battery packs, enabling the battery packs to realize balanced charging and discharging, wherein the designed control flow has a certain refresh frequency; and enabling the control flow to return to the first step to collect data again and circulate the operation. Balanced charging and discharging of the battery pack are spontaneously achieved according to the required power absorbed/emitted by the energy storage system, system shutdown operation is not needed, an additional balanced charging and discharging circuit is not relied on, energy can be fully utilized, and the system has the advantages of being simple in structure, easy to achieve, free of energy waste and capable of prolonging the service life of the battery pack.

The invention discloses an energy storage system BMS control system which comprises a system detection module, a system evaluation module, a system equalization module, a system analysis module and alogic control module. The system detection module detects an energy storage system and a control system in a BMS system. The detection results are respectively sent to other modules in the system; thesystem evaluation module is used for evaluating the BMS system according to the detection results provided by the system detection module; the system equalization module performs equalization mode selection according to the detection result of the system detection module and the evaluation result of the system evaluation module; the energy storage system and the control module in the control system are dynamically analyzed by the system analysis module to obtain a control strategy of the BMS system, and various devices in the BMS system are controlled by the logic control module according tothe control strategy obtained by the system analysis module. The beneficial effects of the system are that high efficiency and accuracy can be realized, and good reference value can be provided for the application and popularization of the BMS system in new energy.

The invention discloses a charge and discharge circuit for a three-level battery pack. A first shunting unit and a second shunting unit are arranged at two ends of a positive electrode group between apositive electrode and a neutral electrode of a lithium battery pack and a negative electrode group between the neutral electrode and a negative electrode in parallel separately; a BMS control unit monitors voltage of the positive electrode group and the negative electrode group; when the voltage of the positive electrode group is higher than that of the negative electrode group, a first switch is controlled to be closed and a second switch is controlled to be opened; and when the voltage of the positive electrode group is lower than that of the negative electrode group, the first switch is controlled to be opened and the second switch is controlled to be closed, thereby achieving balance of charging voltage at a positive end and a negative end of the lithium battery pack. According to the charge and discharge circuit disclosed by the invention, balanced charging of the three-level battery pack is achieved by adopting a single-level charger and matching with an inter-group equalization circuit, and the discharge time and the service life of the battery pack are effectively prolonged.

The invention provides a battery pack equalizing charging and discharging device in the technical field of charge and discharge. The battery pack equalizing charging and discharging device comprises acontrol module, a group charging and discharging module, an independent discharging module and a display alarm module, wherein a voltage division circuit in a peripheral circuit of the control moduledivides the voltage of each battery into the range acceptable by the control module; the control module receives the voltage value of each battery and controls the charging and discharging module tocharge and discharge the battery according to the received battery voltage; the independent discharging module is connected with all batteries, when the batteries are charged, the control module controls the independent discharging module to enable the batteries to enter a discharging state or not, and the control module sends real-time voltage to the display alarm module and controls the alarm action of the display alarm module. The efficiency of the battery pack is improved, and the service life of the battery pack is prolonged.