Rapid test device and method for insulation internal resistance of unit battery cell

Abstract

The invention provides a rapid test device for an insulation internal resistance of a unit battery cell. A bidirectional AC (Alternating Current) / DC (Direct Current) module, a bidirectional DC / DC module and an energy storage filtration module are adopted; an alternating current is converted in to a direct current; after filtering, the direct current is supplied to the bidirectional DC / DC modulein a next level so as to provide a charging power source for a battery; the discharge energy of the battery is inverted through the bidirectional AC / DC module and is fed back to a power grid, therebyimplementing bidirectional flowing of the energy and high-quality electric energy feedback in a battery testing process; a full-wave bridge type circuit is adopted by the system, the volume and weightof the equipment are reduced and the power density of the equipment is enhanced.

Description

technical field [0001] The invention relates to the technical field of resistance testing, in particular to a device and method for quickly testing the insulation internal resistance of a single cell. Background technique [0002] With the rapid development of the new energy vehicle industry, the demand for power batteries has shown explosive growth. As the verification test equipment for power batteries, single cell test equipment has been widely used in the production, process testing and factory testing of power batteries. [0003] Existing battery internal resistance testing methods include: [0004] 1. Density method: The density method mainly estimates the internal resistance of the battery by measuring the density of the battery electrolyte. It is often used to measure the internal resistance of open-type lead-acid batteries. It cannot measure the internal resistance of sealed batteries, so the scope of application is extremely narrow. [0005] 2. Open circuit voltag...

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Problems solved by technology

[0004] 1. Density method: The density method mainly estimates the internal resistance of the battery by measuring the density of the battery electrolyte. It is often used to measure the internal resistance of open-type lead-acid batteries. It cannot measure the internal resistance of sealed batteries, so the scope of application is extremely narrow

[0005] 2. Open circuit voltage method: The open circuit voltage method is to estimate the internal resistance of the battery by measuring the battery terminal voltage. Since the terminal voltage of a battery with a small capacity will still be normal in the floating charge state, the open circuit voltage method measurement accuracy is poor and may even give erroneous results

[0008] Existing test equipment has defects such as low test accuracy, slow current response time, and inflexible configuration, which cannot meet the needs of different test needs of users. Therefore, the test accuracy is improved, the current dynamic response time is improved, flexible configuration schemes, big data analysis and management And other technologies are the development trend of single cell test equipment in the large-scale production and testing application in the field of new energy

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