Abstract: Provided is a bipolar lead-acid battery relating to the technical filed of battery. The bipolar lead-acid battery includes a housing with a battery cavity inside and a plurality of single cells provided in the battery cavity, each of the single cells has an inner cavity for electrolyte injection, and the inner cavity of each single cell is independent of one another, and the housing has a plurality of air-distributing chambers communicating with the inner cavity of the each of the single cells in one-to-one correspondence above the battery cavity, wherein the housing further has a common pressure chamber, the air-distributing chambers communicate with the common pressure chamber through vents, respectively. The bipolar lead-acid battery has the advantages that it can be successfully manufactured and can be used normally, and solves the problems of short service life and unsuccessful manufacture of the existing battery.

Abstract: A high efficiency electric motor stator manufactured with grain-oriented silicon steel sheets. It comprises a grain-oriented silicon steel sheet group, and fixation sheets for the stator core secured on both sides of the grain-oriented silicon steel sheet group. The grain-oriented silicon steel sheet group is formed by stagger-stacking the forward oriented silicon steel sheet layers and the reverse oriented silicon steel sheet layers alternatingly. The forward oriented silicon steel sheet layers and the reverse oriented silicon steel sheet layers are both formed by arranging and enclosing the grain-oriented silicon steel sheets in a circular manner, with the grain orientation being in the radial direction. The present invention changes the conventional grain-oriented silicon steel sheets of a high magnetic induction and a low core loss, into small sized stamping parts, and then takes advantage of a specific structure to arrange them, so as to greatly improve the motor's efficiency.