Battery module

1. A battery module, comprising:

a plurality of battery units arranged side by side in a thickness direction, each battery unit comprising:

at least one pouch-type secondary battery; and

a fixture securely mounting the at least one pouch-type secondary battery;

two side plates respectively positioned at two ends of the plurality of battery units in a length direction;

wherein

a first engaging portion is formed between the fixtures of every two adjacent battery units at each end in the length direction;

each side plate has a plurality of second engaging portions, each second engaging portion is engaged with the corresponding first engaging portion to securely connect each side plate and the every two adjacent battery units;

each fixture comprises:

a first cover plate;

a second cover plate facing the first cover plate in the thickness direction; and

two brackets respectively positioned at two sides of the first cover plate and the second cover plate in the length direction and detachably fixed to the first cover plate and the second cover plate;

wherein at least two pouch-type secondary batteries are received in a receiving space formed by the first cover plate, the second cover plate and the two brackets.

2. The battery module according to claim 1 , wherein

each first engaging portion is a recessed groove, and the second engaging portion is a protrusion engaged with the recessed groove by concave-convex fit; or

each first engaging portion is a protrusion, and the second engaging portion is a recessed groove engaged with the protrusion by concave-convex fit.

3. The battery module according to claim 1 , wherein the battery module further comprises: two end plates respectively positioned at two ends of the plurality of battery units in the thickness direction.

4. The battery module according to claim 1 , wherein

each pouch-type secondary battery has two electrode tabs opposite in polarity;

each bracket has:

a body portion provided with a first through hole, the first through hole passes through the body portion in the length direction and allows the electrode tab of the corresponding pouch-type secondary battery to pass through;

two supporting portions formed on the body portion, spaced apart from each other in the thickness direction and extending toward an inner side of the body portion; and

two extending portions formed on the body portion, spaced apart from each other in a height direction and extending toward an outer side of the body portion;

the two adjacent extending portions of every two adjacent brackets in the thickness direction are arranged side by side and together form the first engaging portion.

5. The battery module according to claim 4 , wherein two ends of each extending portion of each bracket in the thickness direction are provided with draft angles, the two adjacent draft angles of every two adjacent extending portions arranged side by side in the thickness direction together form the first engaging portion.

6. The battery module according to claim 4 , wherein each side plate further has:

a first inner platform surface pressing one extending portion of each bracket downwardly; and

a second inner platform surface pressing the other one extending portion of each bracket upwardly.

7. The battery module according to claim 6 , wherein the second engaging portions of each side plate are formed on the first inner platform surface and/or the second inner platform surface.

8. The battery module according to claim 4 , wherein each bracket further has:

a second through hole passing through one supporting portion of each bracket; and

a first column formed on the other one supporting portion of each bracket;

the first column of one of every two adjacent brackets in the thickness direction is inserted into the second through hole of the other one of every two adjacent brackets in the thickness direction to assemble every two adjacent battery units.

9. The battery module according to claim 8 , wherein each end plate has:

a mounting hole formed at one end of each end plate in the length direction and allowing the corresponding first column of one bracket which is outermost in the thickness direction to insert therein; and

a guide column formed at the other end of each end plate in the length direction and inserting the corresponding second through hole of one bracket which is outermost in the thickness direction.

10. The battery module according to claim 4 , wherein

the first cover plate has two first edges respectively positioned at two ends of the first cover plate in the length direction, and each first edge is provided with a first latching groove passing through the first edge in the thickness direction;

the second cover plate has two second edges respectively positioned at two ends of the second cover plate in the length direction, and each second edge is provided with a second latching groove passing through the second edge in the thickness direction;

each bracket is provided with a first latching protrusion and a second latching protrusion respectively protruding inwardly from two sides of the bracket in the thickness direction, and the first latching protrusion and the second latching protrusion are respectively formed in the corresponding supporting portions of each bracket, and the first latching protrusion is latched with the first latching groove, the second latching protrusion is latched with the second latching groove.