An electrochemical apparatus (100) and an electrical device. The electrochemical apparatus (100) comprises: a housing (1), a first
feedthrough member (7), an
electrode assembly (2), and a first tab (3). The housing (1) is provided with an
accommodation cavity (14), and the
electrode assembly (2) is accommodated in the
accommodation cavity (14). The housing (1) comprises a first side plate (131), and the first
feedthrough member (7) passes through the first side plate (131) and is insulated from the first side plate (131). The first tab (3) is connected to the
electrode assembly (2). The electrochemical apparatus (100) further comprises a first adapter (5), and the first adapter (5) is accommodated in the
accommodation cavity (14). The first tab (3) is provided with a first bending groove (324). One end of the first adapter (5) is connected to a groove wall of the first bending groove (324), and the other end of the first adapter (5) is electrically connected to the first
feedthrough member (7). In a thickness direction of the first side plate (131), a projection of the first tab (3) does not overlap a projection of the first feedthrough member (7). The above configuration helps to shorten the size of the electrochemical apparatus (100) in the width direction, and if the width of the electrochemical apparatus (100) is unchanged, more space can be allocated for the electrode assembly (2), helping to enhance the
energy density of the electrochemical apparatus (100).