9results about How to "Guaranteed cycle life" patented technology

The invention relates to the technical field of batteries, and discloses a battery, a battery box and an electric automobile, and the battery comprises a battery cell which comprises a body part and a battery cell output part, and one end, connected with the body part, of the battery cell output part is a root part of the battery cell output part; the electrode terminal assembly is welded with the battery cell output part and forms a first connecting area, and the first connecting area is provided with a first edge close to the body part and a second edge far away from the body part in the first direction; wherein in the state that the battery cell output part is leveled in the first direction, the distance between the root part and the second edge is a, the distance between the root part and the first edge is b, the fault rate of the battery cell output part in the first connection area is c, and b / (a * c) is larger than or equal to 0.003 and smaller than or equal to 0.04. The over-current capability between the electrode terminal assembly and the battery core output part is ensured, the voltage jump of the battery is avoided, the reliability of the battery is ensured, the safety problems of thermal runaway of the battery and the like are avoided, and the safety performance of the battery is ensured.

This utility model relates to the field of battery cell technology and discloses a novel soft-pack PACK structure, including a housing. A cover is fixedly connected to the outer wall of the housing, and a sealing ring is fixedly connected to the inner wall of the cover. A support is installed inside the housing, and an epoxy board is fixedly connected to the outer wall of the support. Copper-aluminum composite busbars are installed on the left and right outer walls of the epoxy board, with threaded rods threaded into the interior of the copper-aluminum composite busbars. An aluminum busbar is fixedly connected inside the epoxy board, and a pressure strip is provided on the outer wall of the aluminum busbar. In this utility model, the housing and cover house the battery cells to protect them from external impact damage. An epoxy board is placed on the side of the support, and then an aluminum busbar is installed inside the epoxy board. A pressure strip is then fixed to one side of the aluminum busbar, and a data acquisition line is placed between the pressure strip and the aluminum busbar. This achieves the effects of ensuring battery cell overcurrent, welding strength, and stable data acquisition.

The invention discloses a battery module and a battery pack. The battery module comprises a battery pack, and the battery pack comprises a plurality of battery cells which are sequentially arranged along a first direction; the end plate assemblies are arranged at the two ends of the battery pack in the first direction, each end plate assembly comprises an end plate and a buffer layer, the buffer layers are arranged on the sides, close to the battery pack, of the end plates, and the buffer layers are attached to the corresponding battery cells; a concave part is arranged in the middle area of the side, facing the buffer layer, of the end plate, a convex part is arranged in the middle area of the side, facing the end plate, of the buffer layer, and the concave part and the convex part are correspondingly arranged in a matched mode. The battery pack comprises a box body, a mounting cavity is formed in the box body, and supporting beams are arranged at the two ends of the mounting cavity in the first direction; the battery pack is mounted in the adaptive mounting cavity, one side, far away from the battery pack, of the end plate is connected with the supporting beam, and the other side, in the third direction, of the battery module is fixed in the box body through heat-conducting glue. Through the buffer structure, the expansion uniformity of the battery cell is improved, and local stress concentration is reduced, so that the performance of the battery cell is ensured, and the long cycle life of the battery module and the battery pack is maintained.

This invention relates to the field of lithium battery technology, and in particular to a method for preparing a lithium-ion battery cell. The invention discloses a method for preparing a lithium-ion battery cell, comprising: first, preparing a positive electrode slurry containing modified titanium aluminum carbide, graphene oxide, etc., and a negative electrode slurry containing aminated carbon nanotubes, zinc aluminum spinel, etc., both processed according to specific proportions and processes; second, coating the positive and negative electrode slurries separately onto a current collector, and obtaining positive and negative electrode sheets through drying, coating with a coating agent, etc.; next, preparing a composite separator coated with a separator coating agent and curing it; finally, winding the separator in a positive-separator-negative-separator sequence, and obtaining a lithium-ion battery cell through drying, encapsulation, electrolyte injection, formation, etc.

This invention relates to an intelligent thermal management control method for power batteries, comprising: acquiring real-time operational monitoring data of the power battery, including battery temperature distribution, current, voltage, SOC, power, and vehicle operating conditions; constructing and continuously updating an adaptive dynamic thermal characteristic model of the power battery based on the real-time operational monitoring data, used to describe the mapping relationship between battery heat generation, heat dissipation, and temperature changes under the current battery aging level and vehicle operating conditions; dynamically adjusting the adaptive dynamic thermal characteristic model and combining it with predicted battery usage needs through a model predictive control algorithm to predict battery temperature changes within a preset time period and calculate the optimal thermal management control sequence; and dynamically executing thermal management actions based on the optimal thermal management control sequence, the vehicle operating conditions, and the initial temperature range of the battery, to manage battery temperature more efficiently.

The invention provides a front edge beam structure for a battery pack, the battery pack and a vehicle, and belongs to the technical field of battery packs, the battery pack comprises a first shell, an electrical assembly and a second shell which are sequentially arranged in the first direction, and the front edge beam structure comprises an edge beam body and a connecting piece; the boundary beam body is used for being connected with one of the first shell piece and the second shell piece, one side of the connecting part of the connecting piece is used for being connected with the end, in the second direction, of the other one of the first shell piece and the second shell piece, the second direction is perpendicular to the first direction, and the other side of the connecting part is connected with part of the boundary beam body. A distance is formed between the bearing part of the connecting piece and the boundary beam body in the second direction; a first distance between one side, deviating from the connecting part, of the bearing part and one of the first shell part and the second shell part is smaller than or equal to a second distance between a battery cell in the electrical assembly and one of the first shell part and the second shell part; the front edge beam structure is good in structural stability and beneficial to prolonging the service life of the battery pack.

This application discloses a method for preparing lithium manganese iron phosphate, a cathode material, and a lithium-ion battery, relating to the field of battery technology. This application uses a manganese source and an iron source to obtain manganese iron oxide through solid-state sintering, wherein at least one of the manganese source and the iron source is an oxide. The manganese iron oxide is then mixed with a lithium source and a phosphorus source in a solid-state mixture, and solid-state sintering is performed at 350–900°C to obtain lithium manganese iron phosphate. The preparation method provided by this application can reduce the use of sulfate, thereby reducing the generation of toxic sulfur dioxide gas. Furthermore, it facilitates the synthesis of high-purity, high-tap-density lithium manganese iron phosphate materials, reduces process costs, and improves the performance of the obtained lithium manganese iron phosphate materials. The cathode material and lithium-ion battery provided by this application include lithium manganese iron phosphate prepared by the above method.

The invention relates to the technical field of lithium battery manufacturing, in particular to a winding needle assembly and battery cell manufacturing equipment. The winding needle assembly comprises a first winding needle and a second winding needle which are matched with each other and are oppositely arranged; the first winding needle comprises a first plane, a second plane and a first cambered surface, the first plane and the second plane are parallel to each other, and the first cambered surface is located on the side, away from the second winding needle, of the first winding needle; the second winding needle comprises a third plane, a fourth plane and a second cambered surface, the third plane and the fourth plane are parallel to each other, and the second cambered surface is located on the side, away from the first winding needle, of the second winding needle; when the first winding needle and the second winding needle are combined together, the third plane and the first plane are located on the same plane, and the fourth plane and the second plane are located on the same plane. The service life of the battery cell can be effectively prolonged, and the use safety of the battery cell can be effectively improved.

The invention discloses a positive active material for a power battery and a production process thereof, the positive active material for the power battery comprises major materials and auxiliary additives, the major materials comprise 80-85% of lead powder; 4%-9% of sulfuric acid; 7.5%-11.5% of pure water; the auxiliary additive comprises the following components in percentage by weight: 0.1%-0.20% of graphite; 0.08%-0.12% of short fibers; 0.08% to 0.1% of antimony trioxide; 0.09% to 0.14% of stannous mono-sulphate; 0.3%-0.7% of glass fiber; and 0.2%-0.5% of lithium hydroxide. Medium-long glass fibers are arranged to construct a macroscopic framework to provide millimeter-level support, the overall deformation resistance of the lead plaster is effectively improved, microcosmic pores of the lead plaster are accurately filled with superfine short fibers, microcosmic bonding among particles is effectively enhanced, the superfine short fibers and the microcosmic pores are combined to form a continuous'micro-medium-macro 'three-level reinforced network, and the microcosmic bonding is effectively enhanced. The contradiction that traditional fibers are difficult to disperse if being long and weak in support if being short is solved, so that the bonding force between the adjusted lead paste and the grid is greatly improved, the falling rate of active substances is reduced, and the lead paste is more suitable for being used in a high-frequency vibration scene.