Lithium ion battery charge state and parameter adaptive joint estimation method

The invention discloses a lithium ion battery charge state and parameter adaptive joint estimation method in the technical field of lithium ion battery management. The lithium ion battery charge state and parameter adaptive joint estimation method includes the steps of determining key coefficients having influences on the SOC estimation accuracy of the lithium ion battery charge state, identifying basic parameters for estimating the lithium ion battery charge state, calculating a terminal voltage estimated value of a lithium ion battery at the moment k with the battery state equation, measuring a terminal voltage actual value of the lithium ion battery at the moment k at the same time, updating the key coefficients at the moment k according to the key coefficient updating equation, getting the state of the lithium ion battery at the moment k+1, and calculating a terminal voltage estimated value of the lithium ion battery at the moment k+1 according to the updated key coefficients and the state of the lithium ion battery at the moment k+1. By means of the lithium ion battery charge state and parameter adaptive joint estimation method, estimation to the terminal voltage of the lithium ion battery at any moment is high in accuracy, and the lithium ion battery charge state and parameter adaptive joint estimation method is easy to implement.