diff --git a/src/main/java/com/alibaba/excel/converters/ConverterKeyBuild.java b/src/main/java/com/alibaba/excel/converters/ConverterKeyBuild.java
index a92f3033..f1068591 100644
--- a/src/main/java/com/alibaba/excel/converters/ConverterKeyBuild.java
+++ b/src/main/java/com/alibaba/excel/converters/ConverterKeyBuild.java
@@ -39,6 +39,6 @@ public class ConverterKeyBuild {
         if (cellDataTypeEnum == null) {
             return key;
         }
-        return key + "-" + cellDataTypeEnum.toString();
+        return key + "-" + cellDataTypeEnum;
     }
 }
diff --git a/src/main/java/com/alibaba/excel/metadata/csv/CsvCell.java b/src/main/java/com/alibaba/excel/metadata/csv/CsvCell.java
index 4898ff2c..6128ebd4 100644
--- a/src/main/java/com/alibaba/excel/metadata/csv/CsvCell.java
+++ b/src/main/java/com/alibaba/excel/metadata/csv/CsvCell.java
@@ -86,6 +86,9 @@ public class CsvCell extends CellBase {
         this.csvRow = csvRow;
         this.columnIndex = columnIndex;
         this.cellType = cellType;
+        if (this.cellType == null) {
+            this.cellType = CellType._NONE;
+        }
     }
 
     @Override
@@ -98,6 +101,7 @@ public class CsvCell extends CellBase {
         FormulaData formulaData = new FormulaData();
         formulaData.setFormulaValue(formula);
         this.formulaData = formulaData;
+        this.cellType = CellType.FORMULA;
     }
 
     @Override
@@ -108,6 +112,7 @@ public class CsvCell extends CellBase {
     @Override
     protected void setCellValueImpl(double value) {
         numberValue = BigDecimal.valueOf(value);
+        this.cellType = CellType.NUMERIC;
     }
 
     @Override
@@ -116,11 +121,13 @@ public class CsvCell extends CellBase {
             return;
         }
         this.dateValue = LocalDateTime.ofInstant(value.toInstant(), ZoneId.systemDefault());
+        this.cellType = CellType.NUMERIC;
     }
 
     @Override
     protected void setCellValueImpl(LocalDateTime value) {
         this.dateValue = value;
+        this.cellType = CellType.NUMERIC;
     }
 
     @Override
@@ -129,16 +136,19 @@ public class CsvCell extends CellBase {
             return;
         }
         this.dateValue = LocalDateTime.ofInstant(value.toInstant(), ZoneId.systemDefault());
+        this.cellType = CellType.NUMERIC;
     }
 
     @Override
     protected void setCellValueImpl(String value) {
         this.stringValue = value;
+        this.cellType = CellType.STRING;
     }
 
     @Override
     protected void setCellValueImpl(RichTextString value) {
         richTextString = value;
+        this.cellType = CellType.STRING;
     }
 
     @Override
@@ -241,11 +251,13 @@ public class CsvCell extends CellBase {
     @Override
     public void setCellValue(boolean value) {
         this.booleanValue = value;
+        this.cellType = CellType.BOOLEAN;
     }
 
     @Override
     public void setCellErrorValue(byte value) {
         this.numberValue = BigDecimal.valueOf(value);
+        this.cellType = CellType.ERROR;
     }
 
     @Override
diff --git a/src/main/java/com/alibaba/excel/metadata/data/WriteCellData.java b/src/main/java/com/alibaba/excel/metadata/data/WriteCellData.java
index 82231e5f..4c54b6fa 100644
--- a/src/main/java/com/alibaba/excel/metadata/data/WriteCellData.java
+++ b/src/main/java/com/alibaba/excel/metadata/data/WriteCellData.java
@@ -40,7 +40,7 @@ public class WriteCellData<T> extends CellData<T> {
      */
     private HyperlinkData hyperlinkData;
     /**
-     * sytle
+     * style
      */
     private WriteCellStyle writeCellStyle;
 
diff --git a/src/main/java/com/alibaba/excel/write/executor/AbstractExcelWriteExecutor.java b/src/main/java/com/alibaba/excel/write/executor/AbstractExcelWriteExecutor.java
index 9f32153e..44ba04ee 100644
--- a/src/main/java/com/alibaba/excel/write/executor/AbstractExcelWriteExecutor.java
+++ b/src/main/java/com/alibaba/excel/write/executor/AbstractExcelWriteExecutor.java
@@ -269,6 +269,10 @@ public abstract class AbstractExcelWriteExecutor implements ExcelWriteExecutor {
             converter = excelContentProperty.getConverter();
         }
         if (converter == null) {
+            // csv is converted to string by default
+            if (writeContext.writeWorkbookHolder().getExcelType() == ExcelTypeEnum.CSV) {
+                targetType = CellDataTypeEnum.STRING;
+            }
             converter = currentWriteHolder.converterMap().get(ConverterKeyBuild.buildKey(clazz, targetType));
         }
         if (converter == null) {