A battery pack, comprising: a module assembly comprising two or more battery modules , wherein each of the battery modules comprises an end plate and a plurality of battery cores arranged side by side along a length direction (Y) of the battery pack, the end plate is located on at least one side of the plurality of battery cores in the length direction (y), and the two or more battery modules are arranged side by side along a width direction (X) of the battery pack; and a limiting plate disposed on at least one side of the module assembly in the length direction (Y) and correspondingly to the end plates , wherein the limiting plate comprises an inner side surface towards the end plates , two or more first inserting and receiving portions are provided on the inner side surface to correspond to two or more end plates respectively, second inserting and receiving portions are provided on the surface of the end plates towards the limiting plate to correspond to the first inserting and receiving portions , and the two or more battery modules are coupled with the limiting plate via one of the first inserting and receiving portions and one of the second inserting and receiving portions respectively, each of the first inserting and receiving portions is configured as a groove, and each of the second inserting and receiving portions is configured as a convex column fitting to the groove; the groove is configured as a tapered groove, an aperture of the groove is gradually reduced in a direction away from the end plates , and the convex column is configured as a tapered convex column, and a cross section of the convex column is gradually reduced in a direction away from the end plates , and the battery pack further comprises a lower case comprising a bottom wall , a side wall connected to each other, and an accommodating space surrounded by the bottom wall and the side wall , and the module assembly and the limiting plates are both disposed in the accommodating space . a module assembly comprising two or more battery modules , wherein each of the battery modules comprises an end plate and a plurality of battery cores arranged side by side along a length direction (Y) of the battery pack, the end plate is located on at least one side of the plurality of battery cores in the length direction (y), and the two or more battery modules are arranged side by side along a width direction (X) of the battery pack; and a limiting plate disposed on at least one side of the module assembly in the length direction (Y) and correspondingly to the end plates , wherein the limiting plate comprises an inner side surface towards the end plates , two or more first inserting and receiving portions are provided on the inner side surface to correspond to two or more end plates respectively, second inserting and receiving portions are provided on the surface of the end plates towards the limiting plate to correspond to the first inserting and receiving portions , and the two or more battery modules are coupled with the limiting plate via one of the first inserting and receiving portions and one of the second inserting and receiving portions respectively, each of the first inserting and receiving portions is configured as a groove, and each of the second inserting and receiving portions is configured as a convex column fitting to the groove; the groove is configured as a tapered groove, an aperture of the groove is gradually reduced in a direction away from the end plates , and the convex column is configured as a tapered convex column, and a cross section of the convex column is gradually reduced in a direction away from the end plates , and the battery pack further comprises a lower case comprising a bottom wall , a side wall connected to each other, and an accommodating space surrounded by the bottom wall and the side wall , and the module assembly and the limiting plates are both disposed in the accommodating space . <EOS>