981 results about "Electric Capacitance" patented technology

The invention relates to the technical field of SOC estimation, in particular to an SOC estimation method and system for a lithium battery pack. The method comprises the following steps: collecting basic parameters and voltage data of a lithium battery pack, generating steady-state voltage data by using singular value decomposition and time domain reconstruction, further performing multi-level feature mapping and performance reconstruction to obtain basic discharge data, calculating battery energy efficiency and deducing normal power consumption based on the data, and calculating the energy efficiency of the lithium battery pack. Discharging simulation is carried out to evaluate the temperature rise condition, discharging capacity attenuation is predicted in combination with working environment parameters, relative errors are calculated, finally, the charge state is corrected, electric quantity self-calibration is carried out, and intelligent state estimation of the lithium battery pack is achieved. According to the invention, a more efficient SOC estimation method is realized.

The invention provides an optical storage parallel network control method, which comprises the following steps: calculating the current load rate percentage of each residual unit according to the connection relation and electrical path information of the residual units after isolation; evaluating the available margin capacity and the frequency regulation bearing capacity of the remaining units, matching the available margin capacity and the frequency regulation bearing capacity with a specific power value and a frequency regulation requirement which need to be compensated, and determining a feasible unit combination scheme for fault recovery; generating a power redistribution list and a frequency adjustment responsibility distribution table according to the direct current bus connection mode of the optimal unit recombination, and obtaining an output power set value and a frequency adjustment parameter of each unit after adjustment; and extracting the continuous power supply time value of the optical storage parallel network, updating the total power supply capacity value of the optical storage parallel network, and maintaining the continuous power output and frequency stability after the fault of the optical storage parallel network.

The invention provides a lithium battery full-temperature-range DCR fitting test method and system based on multi-factor coupling, and relates to the technical field of lithium batteries, and the method comprises the steps: obtaining a to-be-tested lithium battery, carrying out the charge-discharge cycle under a set condition, and measuring the average discharge capacity as an initial capacity reference; the method comprises the following steps: carrying out multi-state-of-charge calibration on a lithium battery cell, adjusting the lithium battery cell to a set target SOC point, sequentially placing the lithium battery cell in different temperature environments to be stable, measuring the DCR value at each temperature, then carrying out cyclic aging on the lithium battery cell to different health states, and measuring the DCR values at each temperature and in different health states; based on the DCR values in different health states at different temperatures, utilizing an Arrhenius formula to fit the relation between the DCR values and the temperatures, introducing an SOC correction function and an SOH correction function, and constructing a three-dimensional DCR fitting model; and according to the fitting model, inputting the target temperature T, the SOC and the SOH, and outputting an estimated test DCR value.

The utility model discloses a silicon capacitor electrode structure and a silicon capacitor, which can further improve the capacitance of a capacitor in a limited space by nesting, combining and arranging a plurality of groups of element arrays distributed in a triangular grid mode more reasonably and precisely, so that the capacitor can store more charges.

The invention relates to the field of storage battery capacity detection, and provides a method for predicting nuclear capacity discharge of a storage battery. The method comprises the following steps: firstly, sampling by adopting a traditional static discharge test method to obtain actual discharge capacity time sequence data of a storage battery pack, and preprocessing the time sequence data; then, constructing a hyper-parameter-based long short-term memory (LSTM) network model, and exploring global optimal hyper-parameters of the LSTM algorithm model by adopting a novel particle swarm optimization (PSO) algorithm to obtain an optimized LSTM algorithm model; and finally, carrying out network training and data prediction on the optimized LSTM algorithm model by adopting the obtained training set data and test set data, and verifying the prediction effect of the storage battery nuclear capacity discharge prediction model. Through verification, complete discharge data of the storage battery can be accurately predicted through short-time discharge data of the storage battery, and the problem that traditional storage battery nuclear capacity discharge detection is time-consuming and labor-consuming is solved.

The embodiment of the invention provides a silicon-carbon negative electrode material and a preparation method thereof, a negative electrode plate and a battery, the silicon-carbon negative electrode material comprises a silicon-carbon inner core and a coating layer coating the silicon-carbon inner core, and the silicon-carbon inner core comprises a porous carbon substrate and nanometer silicon arranged on the porous carbon substrate. The test result of the first cyclic volt-ampere test of the silicon carbon negative electrode material meets at least one of the following conditions: (a) the value of dQ / (dV * C) of a discharge differential capacity curve in a voltage interval of 0.45 V + / -0.05 V is less than or equal to 1.7, dQ / dV represents differential capacity, the unit is mAh / V, C represents charge capacity, and the unit is mAh; (b) no sharp peak exists in a discharge differential capacity curve in a voltage interval of 0.45 V + / -0.05 V, the battery can present a smooth and stable discharge process, the capacity retention ratio and the stability of the battery after circulation are improved, and the preparation method is simple, convenient and feasible, and is suitable for industrial production.

The invention discloses an electric bicycle health state evaluation method, system and device and a storage medium, and belongs to the field of lithium battery electric bicycles, and the method comprises the following steps: obtaining historical SOC data and current SOC data of an electric bicycle battery; calculating the current cycle index of the battery, and calculating the habitual charging depth of the user; obtaining the charging nominal capacity of the battery, and calculating to obtain a capacity attenuation empirical model; calculating a mean health state under the current cycle index; the current charging depth and the current charging capacity are calculated, whether the current charging depth meets the calibration condition or not is judged, and if yes, the average health state is calibrated through the charging nominal capacity and the current charging capacity, and the current cycle number is corrected; and if the calibration condition is not met or the calibration is completed, outputting the average health state of the electric bicycle. According to the invention, the battery health state can be monitored in an electric bicycle scene, a user is helped to know the health degree of the battery, and the use safety of the battery is improved.

The invention discloses a biological carbon / graphene composite material as well as a preparation method and application thereof. The method comprises the following steps: impregnating a biomass raw material with a copper salt solution to obtain a precursor; the precursor is pyrolyzed to obtain a copper oxide modified biological carbon material, then under the conditions of reducing atmosphere and high temperature, carbon dioxide serves as a carbon source, graphene is generated on the copper oxide modified biological carbon material in situ, the biological carbon / graphene / copper composite material is obtained, and the biological carbon / graphene / copper composite material is subjected to copper leaching treatment to obtain the graphene / copper composite material. Obtaining a finished product. The composite material has excellent electrochemical performance, and has excellent rate capability, capacitance and long cycle service life when being used for preparing a capacitor. The preparation method is simple, low in cost and suitable for industrial production.

The invention relates to an annular cement-based supercapacitor and a preparation method and application thereof. The supercapacitor comprises a first circular electrode layer, an annular electrolyte layer and a second annular electrode layer which are sequentially arranged from inside to outside. The first circular electrode layer and the second annular electrode layer are composed of the following components in parts by weight: 100-900 parts of a cementing material, 8-95 parts of a conductive material, 1-50 parts of a water reducing agent, 10-60 parts of an early strength agent and 200-800 parts of water; the annular electrolyte layer comprises the following components in parts by weight: 30-400 parts of a cementing material, 0.05-4 parts of a water reducing agent, 1-20 parts of an early strength agent and 10-200 parts of water; and the three layers all contain inorganic metal ions. The defects of a traditional cement-based super capacitor are structurally improved, the electrode / electrolyte contact area, the ion transmission efficiency and the mass capacitance of the capacitor are obviously improved, and meanwhile the capacitor has the excellent mechanical property.

The invention discloses a health assessment method of a vehicle-mounted battery system and a vehicle. The method comprises the following steps: under the condition of determining that a charge state value of a battery system meets a preset discharge condition, discharging the battery system until the voltage of a single battery of the battery system meets a preset calibration condition; calibrating the state-of-charge value of the battery system based on the relation curve of the state-of-charge value and the open-circuit voltage and the open-circuit voltage of the battery system; charging the calibrated battery system until the state-of-charge value of the battery system meets a preset full charge condition; and evaluating the health state of the battery system based on the original capacity and the actual charging capacity of the battery system, and generating a health evaluation result of the battery system. According to the invention, the technical problems of difficult long-term running vehicle battery state capacity test and insufficient test precision in the prior art are solved.

The invention belongs to the technical field of lithium battery materials, and particularly relates to a preparation method of a polyvinylidene fluoride-hexafluoropropylene-based solid-state lithium battery, and the preparation method comprises the steps of preparing a composite solid electrolyte membrane and assembling the battery. Polyvinylidene fluoride hexafluoropropylene, lithium salt and nitrogen-methyl pyrrolidone are used as raw materials, and the plasticizer and the dendritic mesoporous nano silicon dioxide are added to prepare the composite solid electrolyte membrane, so that more conductive channels are provided for migration of lithium ions, and the electric capacity of the electrolyte is improved; according to the preparation method, the interface compatibility between the PVDF-HFP and the dendritic mesoporous nano silicon dioxide is improved, the electrochemical performance is improved, the crystallinity of the PVDF-HFP is reduced, and short circuit and explosion caused by the fact that dendritic crystals pierce the diaphragm are avoided; the invention solves the potential safety hazards caused by the traditional liquid electrolyte, such as leakage, combustion, explosion and the like, and has the advantages of simple preparation method and low cost, and is suitable for industrial large-scale production.

The invention discloses a display panel and a display device. A pixel circuit of the display panel comprises a driving transistor, a compensation transistor and a storage capacitor which are connected, the driving transistor comprises a driving active part and a driving grid electrode, the compensation transistor comprises a compensation active part and a compensation grid electrode, and the compensation active part and the driving active part are made of different materials. The storage capacitor comprises a first pole plate and a second pole plate which are oppositely arranged, the first pole plate and the driving grid are made of the same material, and the second pole plate and the compensation grid are made of the same material; the first polar plate of the storage capacitor is prepared from the material of the driving gate, and the second polar plate of the storage capacitor is prepared from the material of the compensation gate, that is, the materials of the two capacitor polar plates of the storage capacitor are metal materials, so that the technical problem of insufficient conductor of the capacitor polar plates is eliminated, and the capacitance of the storage capacitor is ensured; and the display effect of the display panel is improved.

The invention discloses a charging pile output power limiting method and system based on battery dynamic parameters. The method comprises the steps that the maximum output power Pmax of a charging pile is set based on the power supply capacity Pgrid of a power grid, and a first sampling period T1 is set; acquiring a battery open-circuit voltage Uoc, an initial charging voltage U0 and a charging current I0; obtaining Rbat based on the Uoc, the U0 and the I0; based on the Pmax, the Rbat and the Uoc, the maximum allowable current Imax of the charging pile is determined; a charging request current Ireq is obtained, if Ireq is larger than Imax, I is set to be equal to Imax, and otherwise I is set to be equal to Ireq; and based on T1, collecting a charging voltage U and a charging current I, and updating Uoc and Rbat so as to limit the output power of the charging pile. The method has the advantages that the maximum allowable output current is dynamically adjusted according to the dynamic parameters of the battery, the output power is effectively prevented from exceeding the limit, and the polarization of the battery is prevented from being aggravated.

The invention discloses a method for regulating and controlling a pore structure of a cement-based supercapacitor, and belongs to the technical field of energy storage. The method for regulating and controlling the pore structure of the cement-based supercapacitor comprises the following steps: firstly, preparing foam, then uniformly stirring cement and sand, adding water and a water reducing agent, fully stirring, and finally, doping the foam into slurry, and fully stirring to obtain the slurry. And pouring the stirred slurry into a mold, standing for 24 hours, and demolding to obtain the cement matrix. And packaging the front, back, left and right surfaces of the cement matrix by using epoxy resin, and drying at 60 DEG C for 3 days. And soaking the treated test piece in a 2mol / L KOH solution for 5 days, and then manufacturing the test piece into the cement-based supercapacitor. According to the invention, the regulation and control of the pore structure of the cement-based supercapacitor are realized, the treated cement-based supercapacitor has better pore connectivity, the pores show tropism, the conductivity and the capacitance are better, the specific capacitance can reach 63.3 F / m < 2 > to the maximum, and the compressive strength and the breaking strength are reduced.

The invention belongs to the technical field of flexible transparent energy storage, and discloses a preparation method and application of a flexible stretchable transparent MXene / AgNWs / PDMS composite film electrode, according to the method, a PDMS substrate film, AgNWs and MXene are assembled layer by layer, and a Schottky barrier is formed between one-dimensional AgNWs and two-dimensional MXene, so that the MXene material is firmly attached to the surface of the AgNWs material, corrosion of the AgNWs can be prevented, and the service life of the flexible stretchable transparent MXene / AgNWs / PDMS composite film electrode is prolonged. According to the MXene / AgNWs / PDMS composite film electrode, the cycle stability of the composite electrode is improved, a 1D / 2D heterostructure can be formed, the electrochemical storage capacity of the MXene / AgNWs / PDMS composite film electrode is effectively improved, and a flexible transparent supercapacitor with high light transmittance, high capacitance and mechanical flexibility perfectly unified is expected to be achieved.

A detergent dispenser for a dishwasher comprises a dispenser body (20) having a front portion at which is defined a container (40) delimited by a plurality of walls (40a-40d) for containing a detergent (LD). The dispenser (1) comprises a sensor device (50) having a sensitive portion configured to detect an electrical capacitance. The sensitive portion comprises a single detection electrode (Jd) arranged outside the container (40) in a side-by-side position with respect to a first wall (40b) of the plurality of walls (40b-40d) defining the container (40). The sensor device (50) comprises a control circuit (MC) to which the single detection electrode (Jd) is connected in a signal communication manner, the control circuit (MC) being configured for detecting the presence and / or type of detergent present in the container (40) as a function of a first value representative of an electrical capacity between the single detection electrode (Jb) and the detergent present in the container (40).

The invention relates to the technical field of battery management, in particular to an intelligent charging adjustment method and system based on dynamic monitoring, and the method comprises the steps: determining a tested energy storage battery, determining a target battery based on a charging adjustment instruction, carrying out the feature extraction of a plurality of historical charging data and the previous full capacitance, and obtaining a charging emergency coefficient and a battery aging coefficient; a humidity sensor and a temperature sensor are used for obtaining current humidity and current temperature respectively, particle swarm simulation is carried out on a charging emergency coefficient, a battery aging coefficient, a constant current curve set, a constant voltage curve set, a switching curve set, the current humidity and the current temperature, and target constant current, target constant voltage and a target switching threshold value are obtained; and if the target battery voltage is greater than or equal to the target switching threshold, performing charging adjustment on the target battery according to the target constant voltage and the target switching threshold to obtain a final battery, and completing intelligent charging adjustment. The safety and stability of the charging process can be improved, and the service life of the battery is prolonged.

The invention discloses a modification method of a lithium iron phosphate positive electrode material, which comprises the following steps: (1) mixing lithium iron phosphate with a mixed solution of isopropanol and deionized water, and stirring to obtain a solution I; (2) dissolving a lithium-containing compound, a titanium-containing compound and a phosphorus-containing compound in isopropanol to obtain a solution II; (3) slowly dropwise adding the solution II into the solution I, continuously stirring for 3 hours, and then carrying out spray drying to obtain powder; and (4) finally, carrying out heat treatment on the powder material to obtain the lithium iron phosphate coated with lithium titanium phosphate on the surface. According to the invention, the surface of the lithium iron phosphate is coated with a layer of lithium titanium phosphate through a wet coating method, so that the contradiction problem between the compaction density and the electric capacity exertion of the lithium iron phosphate is solved, the compaction density of the lithium iron phosphate is not influenced, the electric capacity exertion is remarkably improved, and the comprehensive performance of the lithium iron phosphate is improved.

The invention provides a conductive carbon material for a cement-based electrode, a preparation method of the conductive carbon material, the cement-based electrode and a supercapacitor, and relates to the technical field of supercapacitors. The carbon black material with specific pore size distribution is prepared through the chlorination reaction, the specific surface area loss is reduced through surface modification, and the network connectivity of the carbon black is further improved. And the organic electrolyte is used, so that the voltage window is greatly improved, and the capacitance is qualitatively leap.

The invention discloses a control method of a multi-branch energy storage system and a terminal. The control method comprises the following steps: acquiring the number of sub energy storage systems in an energy storage architecture and rated output power of each sub energy storage system; detecting required power, and distributing planned output power according to the capacitance ratio of each sub energy storage system; detecting whether the sub energy storage systems with the planned output power greater than or equal to the rated output power exist or not, and if yes, calculating to obtain additional complement power according to the number of the sub energy storage systems and the rated output power; and controlling the sub-energy storage systems with the rated output power greater than the planned output power to provide additional complement power. According to the method, the power supply capabilities of the sub energy storage systems are compared and analyzed, the sub energy storage systems which cannot meet the power supply requirements are screened out, and other sub energy storage systems are arranged to additionally complement the deficient parts, so that disordered power regulation and control among multiple branch energy storage systems under one EMS system is avoided, and orderly power supply regulation of the multiple sub energy storage systems is realized.

The utility model discloses a silicon capacitor electrode structure and a silicon capacitor, which can further improve the capacitance of a capacitor in a limited space by nesting, combining and arranging a plurality of groups of element arrays distributed in a quadrilateral grid mode more reasonably and precisely, so that the capacitor can store more charges.

The invention relates to the technical field of power testing, in particular to multifunctional comprehensive test conversion integrated equipment which comprises a conversion integrated device and test instrument connecting line, a conversion integrated device and a multifunctional comprehensive test line. The conversion integration device and test instrument connecting line is used for connecting the conversion integration device and a test instrument; the conversion integrated device is used for quickly adapting to different test instruments and tested equipment and discharging before and after a test; and the multifunctional comprehensive test line is used for connecting the conversion integrated device and the tested equipment. Test items supported by the device are insulation resistance, dielectric loss capacitance, direct current resistance, transformation ratio and demagnetization tests, all power failure routine test items of the transformer can be completed without replacing a test line, the time of the power failure routine test of the transformer and the frequency of high-altitude operation can be obviously reduced, the working efficiency is greatly improved, and the test cost is reduced. And the safety risk in the test operation process is reduced.

The invention relates to a multi-region power system capacity configuration determination method considering intra-region and inter-region market joint clearing of a capacity market, and the method comprises the steps: constructing a clearing model for intra-region and inter-region electric energy market joint optimization and a capacity market clearing model, and determining the coupling constraint of the intra-region electric energy market and inter-region power purchase, and establishing a joint clearing model to obtain a double-layer optimization model, and solving the joint clearing model by using a Karush-Kuhn-Tucker condition to obtain a joint optimization scheme of power generation installed capacity configuration of each region, cross-region power transmission capacity distribution and system reserve capacity configuration. According to the method, the capacity market, the intra-regional electric energy market and the inter-regional electric energy market are comprehensively considered, so that combined clearing of the electric energy market and the capacity market is realized on the premise of ensuring the stability of the power system, and optimal configuration of resources and coordinated clearing of the electric energy market and the capacity market are realized in the regional market range; and technical support is provided for combined stable operation of a future capacity market and an electric energy market.

The preparation method comprises the following steps: mixing a sodium source, an iron source, a manganese source, a phosphorus source, a carbon source, water and a polyethylene glycol additive with the weight-average molecular weight of 5000-6000, and carrying out sanding, drying, sintering, crushing and other operations on the obtained mixed slurry to obtain the sodium ferromanganese pyrophosphate positive electrode material. The sodium ferromanganese pyrophosphate positive electrode material is obtained. The sodium ferromanganese pyrophosphate positive electrode material is prepared by adopting a wet ball milling-carbon thermal reduction method, and polyethylene glycol with the weight-average molecular weight of 5000-6000 is added as an additive in the preparation process, so that the prepared sodium ferromanganese pyrophosphate positive electrode material is nano spherical particles which are uniform in size distribution and have an excellent carbon conductive network structure. When the material is applied to a sodium-ion battery, the material has good electronic and ionic conductivity, and the electrochemical performance such as discharge capacity, platform voltage, rate capability and cycle performance can be greatly improved.

The invention discloses a preparation method of high-rate fast-charging graphite from a semi-calcined coke raw material, and belongs to the technical field of batteries, and the preparation method comprises the following steps: S1, crushing and shaping the semi-calcined coke raw material; s2, carrying out graphitization high-temperature treatment on the crushed and shaped semi-calcined coke; s3, mixing and coating the semi-calcined coke subjected to graphitization high-temperature treatment with a coating agent; s4, performing high-temperature carbonization heat treatment on the semi-calcined coke mixed and coated with the coating agent; s5, screening the petroleum coke semi-calcined coke subjected to high-temperature carbonization heat treatment to obtain a semi-calcined coke raw material high-rate fast-charging graphite; the material has the advantages of large discharge capacity, good cycle performance, good electrochemical performance, high discharge plateau and plateau retention rate, good large-current charge-discharge performance, good safety, good adaptability to electrolyte and other additives, stable product properties, almost no difference between batches, simple and feasible preparation method, and suitableness for industrial production.

The invention relates to the technical field of storage battery self-diagnosis evaluation and risk early warning, and particularly discloses an intelligent self-diagnosis evaluation and risk early warning method and system for a storage battery. Comprising the steps of diagnosis window signal generation, transient discharge state starting, current compensation instruction generation, stable compensation current formation, gain load adjustment, performance data packet generation, real-time safety monitoring and storage battery comprehensive health assessment. A transient discharge state is started after a stable load period is identified, actual discharge current is sampled at high frequency, dynamic stable compensation current is generated, discharge duration, a single voltage curve and a temperature change rate are synchronously acquired, a multi-dimensional performance data packet is generated, and a safety threshold value is compared in real time to trigger a diagnosis termination mechanism. And finally, by associating the actual discharge capacity with the voltage dispersion, the drop rate and the temperature rise amplitude, issuing an evaluation report containing a capacity conclusion and predictive risk early warning. Accurate assessment and risk pre-management and control of the health state of the storage battery are realized.

The invention provides a charging strategy lithium precipitation boundary window evaluation method and system, and belongs to the field of lithium ion batteries. The method comprises the following steps: manufacturing a lithium ion battery comprising a positive pole piece, a negative pole piece, a diaphragm and an electrolyte; performing a rate charging test on the lithium ion battery at a set rate to obtain constant-current charging capacity and constant-current and constant-voltage charging capacity of the battery under different rates, and calculating a constant-current charge-in ratio; calculating the maximum SOC when the battery cell reaches the lithium precipitation boundary under different charging rates, and formulating a stepped charging strategy according to the maximum SOC; and according to the obtained stepped charging strategy, carrying out a cell charging and discharging cycle test, and judging the lithium precipitation condition of the cell. The method does not need to depend on a three-electrode tool and a special battery device, the lithium precipitation boundary window can be rapidly and efficiently evaluated, the established charging strategy can ensure that lithium precipitation does not occur in the battery cell under the rapid charging condition, and the rapid charging strategy establishment efficiency and the cycle performance and safety of the battery are remarkably improved.

The utility model discloses a ceramic dielectric capacitor, which comprises a single ceramic dielectric capacitor A, a single ceramic dielectric capacitor B, a bonding pad A, a bonding pad B, a bonding pad C, a flexible lead A, a flexible lead B and a shell, the single ceramic dielectric capacitors A are connected through the bonding pad A to form a ceramic dielectric capacitor bank A, and the single ceramic dielectric capacitors B are connected through the bonding pad C to form a ceramic dielectric capacitor bank B; and the ceramic dielectric capacitor bank A is connected with the ceramic dielectric capacitor bank B. A plurality of ceramic dielectric capacitors are connected in series and in parallel in a series-parallel mode, the welding sheets are welded and assembled in the cuboid shell of the capacitor through soldering tin, and the electrodes are welded and led out through the flexible leads, so that the capacitance and the voltage resistance value of the capacitor are improved, the assembling process is optimized, and the problems that the assembled large-size products of 6560 and above are poor in mechanical stress resistance and poor in reliability are solved. Welding points fall off, and the porcelain body cracks are solved.

The invention provides a medium-voltage alternating-current voltage regulating device and a control method, and relates to the technical field of circuits, and the medium-voltage alternating-current voltage regulating device comprises a transformer, at least one power conversion module, a main controller and at least one bypass module. The power conversion module comprises a first inverter bridge arm, a second inverter bridge arm, a third inverter bridge arm, a first inductor, a second inductor, a third inductor and a capacitor bank. When the voltage of the medium-voltage power grid is too high or too low, the power conversion module automatically compensates the voltage of the power grid, so that the voltage is recovered to a normal range. The medium-voltage alternating-current voltage regulating device is large in regulating range, can effectively stabilize the power supply voltage of a medium-voltage power grid, has the effects of high response speed, low cost, high reliability and convenience in maintenance, and can effectively improve the power transmission capacity of the medium-voltage power distribution network.

The utility model belongs to the technical field of energy storage, and particularly relates to a battery and an energy storage device.The energy storage device comprises a supporting piece, a battery pack and a plurality of bearing pieces, the bearing pieces are installed on the side portion of the supporting piece at intervals in the first direction, and each bearing piece comprises a bearing part; the battery pack comprises a plurality of batteries, the plurality of batteries are sequentially installed on the bearing parts of the bearing pieces in the first direction, and the bearing parts are located between every two adjacent batteries; each battery comprises a box body and a battery monomer arranged in the box body; two adjacent batteries are divided into a first battery and a second battery, the bearing piece for bearing the first battery is a first bearing piece, and the bearing piece for bearing the second battery is a second bearing piece; an avoiding structure for avoiding the bearing part of the second bearing piece is arranged on the side part, facing the second battery, of the box body of the first battery; the bearing part can be avoided by utilizing the avoiding structure, so that the internal space of the box body is improved, the battery monomers with larger sizes and larger capacitance can be adopted, and the capacitance of the battery and the energy storage device is improved.