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Charge and discharge control device, charge and discharge control method, battery pack, electronic equipment, electric vehicle, electric tool, and power storage system
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A charge-discharge control and battery pack technology, applied in battery/fuel cell control devices, electric vehicles, vehicle energy storage, etc., can solve the problem of energy density reduction and achieve the effect of improving cycle characteristics
Active Publication Date: 2021-08-13
MURATA MFG CO LTD
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However, since there are many reasons for the increase in internal resistance, an increase in internal resistance that is not caused by rapid deterioration is also detected, and as a result, there is a problem that the usable energy density decreases
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no. 1 approach
[0040] (Description of charge control method, manufacturing method, and charge-discharge control device for a secondary battery)
no. 2 approach
[0042] (Explanation about the secondary battery)
[0043] ·Example
[0044] (Description of the charge control method, manufacturing method, and charge-discharge control device for a secondary battery according to the first embodiment of the present invention)
[0045] ・Application example of the charging and discharging control device according to the present invention
[0046] (battery packs, electronic devices, electric vehicles, power tools, power storage systems)
[0047] (first embodiment)
[0048] First, a charge control method, a manufacturing method, and a charge / discharge control device for a secondary battery according to the first embodiment of the present invention will be described.
[0049] [the whole frame]
[0050] figure 1 It is a schematic conceptual diagram schematically showing the first embodiment of the charge and discharge control device 10 according to the present invention. The charge and discharge control device 10 according to the present inve...
Embodiment A
[0158] Figure 6 It is a graph showing an example of calculating the negative electrode overcharge amount using the charge and discharge control method according to the present invention. In this example, the charge-discharge control test was performed using the lithium-ion secondary battery produced by the above-described production method of the secondary battery 4 as a sample. It should be noted that the lithium ion secondary battery has lithium cobaltate as the positive electrode, graphite as the negative electrode, and a polymer unit having a gel electrolyte and a separator between the positive electrode and the negative electrode.
[0159] In this example, a negative electrode having a combination of 94.5 parts by weight of Gr, 3.5 parts by weight of polyvinylidene fluoride, and 2 parts by weight of a conductive additive was used as the negative electrode. In addition, as a positive electrode, a positive electrode having a combination of 98 parts by weight of lithium co...
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Abstract
Provided are a charge and discharge control device and a charge and discharge control method capable of improving cycle characteristics without reducing the volumetric energy density of a secondary battery. In the present invention, a charging and discharging control device (10) is provided, comprising: a determination unit (1), which determines the ion diffusion rate responsible for the electrical conduction in the secondary battery (4), and determines based on the ion diffusion rate and charging conditions The time-integrated value of the overcharge amount of the active material; the evaluation part (2), based on the judgment result obtained by the judgment part (1), evaluates the charging condition of the secondary battery (4); the charge and discharge control part (3), based on the The evaluation result obtained by the evaluation unit (2) controls the state of current application and voltage application to the secondary battery (4) when the secondary battery (4) is charged or discharged.
Description
technical field [0001] The invention relates to a charge and discharge control device and a charge and discharge control method. More specifically, it relates to a charge and discharge control device, a charge and discharge control method, a battery pack, electronic equipment, an electric vehicle, an electric tool, and an electric power storage system. Background technique [0002] Currently, secondary batteries, especially lithium-ion secondary batteries, are required to have higher capacity and higher performance. For this reason, technical developments such as thickening and increasing the density of electrodes, or introducing materials with higher Li storage capacity than existing materials have been carried out. However, batteries using new materials such as thicker electrodes or higher densities have the following problem: With long-term use, deterioration reactions gradually progress inside the battery, and reactions with normal charge and discharge occur predominant...
Claims
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