The application belongs to the technical field of
direct current substation, and particularly relates to a battery
internal resistance detection device. The application comprises an embedded monitoring host module for receiving and displaying battery
internal resistance data, having an alarm and a background monitoring
communication interface, the embedded monitoring host module being connected with a communication module, the embedded monitoring host module being connected with an information convergence module through the communication module, the information convergence module being connected with a single-section
internal resistance sampling module, the single-section internal resistance sampling module being connected with a battery module; wherein the number of the single-section internal resistance sampling modules is the same as the number of the battery modules, each single-section internal resistance sampling module is directly connected with each corresponding battery module through a short connecting line, and is connected in parallel to the information convergence module through a pressure contact
crystal head connecting line. The application has the advantages of efficient expansion,
adaptation to different sizes of battery groups, short sampling line distance, simple installation process, high detection precision, low cost and good adaptability of the device.