97results about How to "Cell balance" patented technology

The invention discloses a battery pack capacity balancing method and system. The method comprises: S1, acquiring first state parameters of a battery pack; S2, determining a capacity balance mode of the battery pack according to a ratio of a current charged value of the battery pack to a current open-loop voltage; S3, calculating second state parameters of battery cells of the battery pack according to the capacity balance mode; S4, judging whether the battery pack requires capacity balance operation according to the second state parameters, and continuing step S5 if yes; S5, determining a target cell that requires balanced capacity and capacity value of the target cell to be balanced, according to the second state parameters; S6, performing capacity balance operation on the target cell according to the capacity value. The battery pack capacity balancing method and system have the advantages that a working region of a whole battery pack can be subjected to capacity balancing, uniformityof the cells in the battery pack can be ensured more accurately to greater extent, and working performance of the battery pack is improved accordingly.

The invention provides a method and a system for equalizing the electric quantity of single batteries, wherein the system comprises a signal acquisition module, a remained electric quantity calculation module, a control module, a two-way isolation direct current conversion circuit and a switch matrix. The signal acquisition module is used for acquiring the performance parameter information of all single batteries in a battery pack; the remained electric quantity calculation module is used for acquiring the remained electric quantity of all single batteries in the battery pack; the control module is used for determining and controlling the switch matrix to select the single batteries required to be subjected to electric quantity equalization according to the remained electric quantity of all single batteries in the battery pack, and transmits the instruction of charging or discharging the selected single batteries required to be subjected to the electric quantity equalization to the direct current isolation transform circuit; and the two-way direct current isolation transform circuit is used for charging or discharging the selected single batteries required to be subjected to the electric quantity equalization according to the instruction transmitted by the control module. By the technical scheme provided by the invention, the problem of inconsistent performance among single batteries in the battery pack can be effectively solved.

The invention provides a battery power equalization circuit which comprises battery packs, a voltage acquisition module, a switching circuit module, power transferring modules and a main control circuit module, wherein the switching circuit module comprises a plurality of group-inner switches and a plurality of driving circuit used for respectively driving the corresponding group-inner switches; the main control circuit module is used for judging whether powers among batteries are equalized according to voltage signals at two ends of each battery; and if not, sending control signals are to the corresponding driving circuits in the switching circuit module, so that the driving circuits can control the corresponding group-inner switches to be conducted/cut off. Therefore, the power equalization among all the battery packs is realized firstly via the two groups of power transferring modules arranged in parallel; and then the power equalization among the batteries in each battery pack is realized respectively via the two groups of power transferring modules arranged in parallel. As a result, the power equalization among all the batteries is realized. The battery power equalization circuit is simple to control, high in equalization precision and rapid in speed.

The invention is applicable to the field of headphones, and provides an intelligent switching method for a main headset and an auxiliary headset, a Bluetooth playing device and a Bluetooth headset. The method comprises the following steps: a left headset sends its battery power to a right headset, and the right headset sends its battery power to the left headset; The left headset saves the batterypower of the right headset, and the right headset saves the battery power of the left headset. The battery power of the left headset and/or the right headset is compared with that of the right headset. A left headset or a right headset with a higher battery power is connected to the Bluetooth playback device as a primary headset, and a left headset or a right headset with a lower battery power isused as a secondary headset. As that left earphone, the main headset, the auxiliary headset role are not ifxed, the left headset and the right headset of the right headset can all be used as the mainheadset, and do not need human operation to realize automatic switching, so that the battery power of the left headset and the right headset can be balanced, the battery service life is prolonged, and the overall endurance capability and the user experience of the Bluetooth headset are improved.

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 provides a battery balancing device, an automobile battery balancing system and a balancing method. The battery balancing device comprises a balancing structure, a display screen and a first harness port, wherein the balancing structure is used for controlling a plurality of single batteries of a battery pack to perform electric quantity balancing, the display screen is used for displaying a working condition of the battery pack, the first harness port is used for connecting the battery pack and a battery management system BMS of an automobile, and the balancing structure and the display screen are respectively connected with the first harness port. The battery balancing device is arranged independent to the automobile, thus, the battery pack of the automobile can be balanced at any time, and the volume of the battery management system in the automobile is reduced; and the balancing structure is used for balancing electric quantity of the plurality of single batteries of the battery pack, thus, the situation that the charging is stopped caused by excessively fast voltage rise of a certain single battery during the charging process is further prevented, more energy is released by the battery pack during the starting process of the automobile, and the travelling range of an electric vehicle is extended.

The invention relates to a battery pack consistency evaluation method and a battery pack equalization strategy. According to the battery pack consistency evaluation method, a relational graph of an initial rated capacity and an initial dischargeable amount of each to-be-tested battery cell can be established through obtaining the initial rated capacity and the initial dischargeable amount after ato-be-tested battery pack undergoes a charge/discharge cycle. After the to-be-tested battery pack is put into use, a relational graph of an actual rated capacity and an actual dischargeable amount canbe established at any time. Furthermore, key battery cell information in the two relational graphs is respectively obtained, so that an initial battery cell distribution area and an actual battery cell distribution area of the to-be-tested battery pack can be divided to obtain quantitative indexes of consistency evaluation, namely, the areas of the battery cell distribution areas. The battery pack consistency evaluation method provided by the invention is simple to operate, less in data acquisition and simple in calculation process, and can realize intuitive evaluation and quantitative evaluation of battery pack consistency.

The invention discloses a battery management system which is used for carrying out electric quantity equalization on at least two groups of battery packs. Each battery pack comprises at least two battery single bodies. The battery management system comprises a central control unit and electric quantity equalization devices corresponding to each battery pack. The central control unit is connected with each electric quantity equalization device through a first bus. The electric quantity equalization devices are mutually connected through a first inter-group power supply bus and a second inter-group power supply bus. The electric quantity equalization devices are used for carrying out within-group electric quantity equalization on the battery single bodies in the corresponding battery packs respectively and furthermore, carrying out inter-group electric quantity equalization on the different battery packs under the control of the central control unit. Through the method above, the battery management system can carry out within-group electric quantity equalization on the battery single bodies needing electric quantity equalization and meanwhile, carry out inter-group electric quantity equalization on the battery packs needing electric quantity equalization, and thus electric quantity equalization effect is effectively improved.

The embodiments of the invention disclose a volume-based master-slave switching method and related products. The volume-based master-slave switching method can be applied to a wearable device. The wearable device includes a master earplug and a slave earplug. The volume-based master-slave switching method includes the following steps: acquiring a first volume of the master earplug and a second volume of the slave earplug; calculating a first power consumption speed of the master earplug according to the first volume, calculating a second power consumption speed of the slave earplug according to the second volume, and determining a master-slave switching policy between the master earplug and the slave earplug according to the first power consumption speed and the second power consumption speed; and transmitting a master-slave switching command to an electronic device connected to the wearable device according to the master-slave switching policy, wherein the master-slave switching command is used to instruct the electronic device to perform switching between the master earplug and the slave earplug. The technical scheme of the volume-based master-slave switching method has the advantage of high user experience degree.

The invention discloses a red toner for color electrostatic development and a preparation method thereof. The red toner is prepared from the following raw materials in parts by weight: 85-95 parts of polyester resins, 3-6 parts of wax, 2-5 parts of red pigments, 1-3 parts of charge control agent, 1-3 parts of fumed silica and 0.5-2 parts of titanium dioxide. The toner product is prepared by carrying out premixing, mixing, cooling, coarse crushing, gas flow crushing and classifying, micropowder classifying, additive premixing, spherical processing, additive post-mixing and finally sieving and packaging procedures on the materials in sequence. The red toner and the preparation method have the following beneficial effects: compared with the traditional physical crushing methods, in the preparation method, a continuous mixer is adopted instead of an intermittent internal mixer or extruder equipment, spherical processing equipment is added, and the additive premixing and spherical processing procedures are added on the process route, thus effectively solving the problems of nonuniform dispersion and spheroidization of particle shapes.

The invention relates to an electric vehicle intelligent charging method supporting phase rotation and equipment thereof, and the method comprises the following steps: obtaining the respective power supply loads of three phases, and calculating and defining the highest power supply load phase and the lowest power supply load phase; when an electric vehicle is connected to a charging pile for charging, switching, by the charging pile, to the lowest power supply load phase, and supplying power to the electric vehicle; under other conditions, obtaining the charging power of each charging pile inreal time, if the standard deviation of the total charging power of each phase of the three phases is larger than a first threshold value, obtaining an equilibrium distribution scheme of the three phases through calculation, and switching the power supply phase corresponding to each charging pile according to the equilibrium distribution scheme. According to the invention, the power supply phase corresponding to each charging pile is switched according to the equilibrium distribution scheme, the impact and damage to a power grid caused by the imbalance of high-power three-phase loads are reduced, and the electric quantity used by the three phases is balanced.

The invention discloses a Bluetooth headset charging path management method and device and a readable storage medium, and the method comprises the steps: obtaining the electric quantity of a chargingbox when an external power supply is detected, and judging whether the electric quantity of the charging box is smaller than a minimum working electric quantity threshold value or not; and if the electric quantity of the charging box is smaller than the minimum working electric quantity threshold value, closing the charging function of the earphone, and charging the charging box through an external power supply. When an external power supply is connected for charging, firstly determining the state of the charging box. In order to avoid that the Bluetooth earphone cannot communicate due to lowelectric quantity of the charging box, when the electric quantity of the charging box is lower than the minimum working electric quantity threshold, namely the electric quantity of the charging box isinsufficient, the charging box is charged preferentially, the charging function of the earphone is turned off, and the earphone is prevented from consuming the electric quantity of the charging box.Therefore, the charging paths of the Bluetooth earphone and the charging box are adjusted in real time based on the electric quantity of the charging box, the electric quantity of the charging box andthe Bluetooth earphone is balanced, the endurance of the Bluetooth earphone is prolonged, and the user experience is improved.

Provided is an alternating current and direct current charging and active equalization circuit for a lithium battery pack. The circuit comprises a cascaded battery unit, the equalization circuit and acontrol circuit; the cascaded battery unit is divided into three bridge arms A, B and C, each bridge arm includes 2 (m+1) batteries, two inductance elements are connected in the middle of each bridgearm, and the connection nodes of the two inductance elements of any one of the three bridge arms A, B and C are respectively connected to the three phases of an alternating current power supply; theequalization circuit includes a full bridge module, and the full bridge module is connected to a battery; the left side of the cascaded battery unit is connected with a large capacitor C and a directcurrent power source Udc; the control circuit is connected to the cascaded battery unit. By adopting the circuit, the battery can be connected by arbitrarily selecting an alternating current grid or adirect current grid, and can be rectified by a full bridge control circuit to be charged when connected to the alternating current grid. The battery pack can be subjected to power balance in the charging process, the rest process and the use process. The service life of the battery pack is effectively prolonged, and the safety of use is ensured.

The embodiments of the invention disclose a box-level battery management system. The box-level battery management system comprises multiple equalization control chips and a box-level controller. The equalization control chips are employed to conduct equalization control on any two adjacent monomer batteries. At the same time, the box-level controller is employed to monitor the work state of each equalization control chip. Therefore, electric quantity equalization between the any two adjacent monomer batteries is realized, and the performance difference between the any two adjacent monomer batteries is reduced; and moreover, the charge and discharge processes of all the monomer batteries in a whole battery pack can be consistent, so that the service life of the battery pack is prolonged, and accordingly, the problems in the prior art are solved.

The invention relates to a battery electric quantity balancing method and device, equipment and a storage medium. The method comprises the following steps: sequentially obtaining a battery module of each phase from a modular multi-level battery energy storage system, wherein the modular multi-level battery energy storage system comprises at least two phases of battery modules; for the battery module of each phase, dividing the battery modules of the same phase into a charging module and a discharging module; and carrying out battery electric quantity equalization processing on the charging module and the discharging module by adopting the battery modules of other phases until the dischargeable electric quantity of the charging module and the dischargeable electric quantity of the discharging module meet a preset condition. According to the technical scheme provided by the embodiment of the invention, the efficiency of balancing the electric quantity of each battery module in the modularized multi-level battery energy storage system can be improved.

The invention discloses an equalization control method, device and system of a battery. The control method comprises the steps of acquiring output voltages and output currents of each battery and eachbattery module, and estimating electric quantity of the battery and the battery module; processing difference between the output voltage of each battery module and a reference voltage by an error regulator to obtain a public reference current; adjusting the public reference current by feeding forward electric quantity of the battery to obtain a current reference value of each battery; and performing feedback regulation on the public reference current, and controlling a charging current of a corresponding battery. The reference current of each battery is changed according to the electric quantity of each battery, the reference current is adjusted by feedback, so that the size of the charging current is controlled, and the electric quantity of each battery is equalized.

The invention discloses a lossless equalization improvement circuit for an energy storage battery pack based on inductors and an equalization method thereof, which reduces the number of energy storageelements in the equalization improvement circuit and simplifies and the equalization improvement circuit. The lossless equalization improvement circuit comprises a battery pack, wherein the battery pack is formed by sequentially connecting batteries B1, B2...Bn in series. The number of energy storage inductors L in the equalization improvement circuit is n/2, and the energy storage inductors L are respectively L1, L3...Ln-1 from top to bottom. Each energy storage inductor L is connected between a negative electrode of the corresponding battery and a source electrode S of an MOSFET (Metal Oxide Semiconductor Field Effect Transistor) at the right end. The lossless equalization improvement circuit adopts the anti-parallel MOSFETs to replace the energy storage elements, the phenomenon of being unbalanced of the battery pack is improved through controlling on-off of the MOSFETs in the equalization improvement circuit and an energy storage effect of the inductors, the available capacity ofthe battery pack is improved, the maintenance and replacement cycle of the battery pack is reduced, and the service life of the battery pack is prolonged.