67 results about "Lithium-ion flow battery" patented technology

The invention provides a lithium ion flow redox battery, belonging to the technical field of lithium ion batteries. The lithium ion flow redox battery comprises a positive electrode suspension tank, a negative electrode suspension tank and a battery reactor, wherein the positive electrode suspension tank contains the mixture of positive electrode composite material particles and an electrolyte; the negative electrode suspension tank contains negative electrode composite material particles and an electrolyte; the battery reactor comprises a positive electrode current collector, a negative electrode current collector and one layer or a plurality of layers of microporous separators; the microporous separators separate the positive electrode current collector from the negative electrode current collector in an insulation mode so as to respectively form a positive electrode chamber and a negative electrode chamber; the positive electrode chamber is communicated with the positive electrode suspension tank through a seal pipeline; and the negative electrode chamber is communicated with the negative electrode suspension tank through a seal pipeline. Compared with a full vanadium flow redox battery, the lithium ion flow redox battery has the advantage of high energy density, the adoption of the environmentally-friendly and non-toxic electrolyte and low cost, and is applicable to large-scale energy storage of power grids.

The invention discloses a separator and a lithium ion battery. The separator comprises a separator substrate and an organic coating, wherein the organic coating is formed by distributing a cohesive organic polymer on a single surface or double surfaces of the separator substrate in a form of space dispersed and coated strips with specified thickness. Uniformly distributed concave and convex interval zones are shown on the surface of the separator in a manner of multi-space dispersed and coated strip-shaped organic coatings, a certain buffer space is reserved between a positive pole and a negative pole, stress produced by positive and negative pole pieces because of swelling in the charge-discharge process is released, and the probability of distortion in the cycle process of the lithium ion battery is greatly reduced; the internal resistance of the battery is reduced while the better adhesion effect with the positive and negative poles is guaranteed; besides, a channel is provided forinfiltration and circulation of an electrolyte, and the cycle life of the lithium ion battery is prolonged.

The invention, which relates to the field of cathode materials for a lithium battery, discloses a method for determining the performance of a cathode material for a lithium ion battery. The method comprises: taking a cathode material of a lithium ion battery and making a battery by using the cathode material; carrying out charging-discharging circulation; after completion of the charging-discharging circulation, measuring a capacity retention ratio; taking out a pole piece of the battery, detecting a metal dissolution substance on the pole piece and thus measuring contents of all metal components in the metal dissolution substance conveniently; and on the basis of the measuring result, carrying out analysis by combining the capacity retention ratio of the battery after charging-dischargingcirculation completion to determine the performance of the cathode material of the lithium ion battery. The method is simple, efficient and accurate; the metal dissolution substance amount after charging-discharging circulation of the battery can be detected accurately; the result error is small and the accuracy is high; and thus the powerful base is provided for determining the performance of the cathode material of the lithium ion battery accurately.

The invention discloses a method for detecting the electrical property consistency of lithium ion battery. The method comprises the following steps of: performing formation storage and ageing storage on a plurality of monomer batteries for a long time one by one and selecting the battery with large self discharge; performing capacity grading treatment on the rest of qualified monomer batteries toobtain the actual battery volume C of the plurality of monomer batteries, charging the plurality of monomer batteries to the same charging state and classifying the plurality of batteries according to the volume difference standard; performing low-temperature direct-current internal resistance test on the plurality of batteries with the same volume difference standard grade and reclassifying the battery according to the direct-current internal resistance of the battery; and selecting and matching the plurality of batteries in the same direct-current internal resistance grade to form the battery pack. The invention can detect the electrical property consistency of the lithium ion battery under the low-temperature condition, effectively solve the problem that the battery has good electricalproperty consistency under the normal-temperature condition and differed electrical property consistency under the low-temperature condition and is suitable for detecting a batch of batteries and selecting qualified monomer batteries to form a battery pack.