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CN0510 development kit shows unexplainable values on LFP LiFePO cell, impedance and battery impedance SensorPal

		
	
				

			

									
					    BdeWit
					
							

            
            			
				
									
											
			
			
				
			
			
			    	
			                    
                
				                on Aug 19, 2024 
				
			
			
		

		
		                     
				
        		

		    
		    		    

		      		            		        
Category: Hardware

    		        		            		    
Product Number:  CN0510 

    		        		    		    

		    		    
		    			

			    
Hello, 




For a battery management system project I started off with the AD CN0510 development board as I wanted to check how well this chipset works for EIS. 


When trying the devkit with the SensorPal environment I get to a set of results that I do not expect, and I cannot get the values I do expect.




Boards:
- CN0510
- EVAL–ADICUP3029


Software:


- Sensorpal ver. 2.5.2.10
-  firmware ver 2.5.2.7




Used battery cell:


- LFP/LiFePO4


- 3.65V when full, currently ~3.23V


- 6700mAh


Black terminals 1&3 combined and 2&4 combined. 


Red terminals 1&3 to battery neg, red terminals 2&4 to battery pos


Impedance:


When I use the Impedance functionality at a static frequency, the response is "NAN" at the moment:
 
In previous runs I did manage to get values, however they were very unstable (large range of resistance values, 100-600 ohms)




Battery Impedance:
At a static value this already seems to be noisy:
 


At a sweep it does not get much better:


 




I have the feeling I am doing something wrong, but with the manuals and forum replies I don't know what my mistake is.

			

			
									
		                             
                        

    

                                            
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