Battery pack, method for producing battery pack and vehicle

1. A battery pack, comprising a battery module and a case;

wherein the case has a containing chamber, and the battery module is located in the containing chamber;

the battery module comprises a plurality of battery units arranged in a horizontal direction, and each battery unit at least comprises one battery cell;

a size of the battery module in the horizontal direction is larger than a size of the battery module in a vertical direction; and

the size of the battery module in the vertical direction is L 1 , and a size of the battery pack in the vertical direction is L 2 , where 70%≤L 1 /L 2 ≤95%;

wherein the battery cell comprises an electrode assembly, a housing and a top cover assembly, the electrode assembly is housed in the housing, and the top cover assembly is connected to the housing; and

the housing comprises two first side walls and two second side walls, the first side walls face each other in the vertical direction, the second side walls face each other in the horizontal direction, and an area of the first side wall is larger than an area of the second side wall;

wherein the case comprises an upper case cover and a lower case arranged in the vertical direction, the upper case cover is connected to the lower case, and the containing chamber is formed between the upper case cover and the lower case; and

the battery module is fixed to the lower case;

wherein in the vertical direction, the battery module and the upper case cover are spaced by a certain distance, and the battery module and the lower case are spaced by a certain distance.

2. The battery pack according to claim 1 , wherein each battery unit comprises a plurality of battery cells stacked in the vertical direction.

3. The battery pack according to claim 1 , wherein

the electrode assembly comprises a first electrode sheet, a second electrode sheet and a diaphragm, and the diaphragm isolates the first electrode sheet from the second electrode sheet;

the first electrode sheet, the diaphragm and the second electrode sheet are coiled into a flat shape, or the first electrode sheet, the diaphragm and the second electrode sheet are stacked in the vertically direction; and

the electrode assembly has two wide surfaces and two narrow surfaces, the wide surface and the first side wall face each other in the vertical direction, and the narrow surface and the second side wall face each other in the horizontal direction.

4. The battery pack according to claim 1 , wherein

the battery pack further comprises a heat exchange member, and the heat exchange member is disposed on one side of the battery module in the vertical direction; and

a size of the heat exchange member in the vertical direction is L 3 , wherein 70%≤(L 1 +L 3 )/L 2 ≤95%.

5. The battery pack according to claim 1 , wherein the battery pack further comprises a heat exchange member, and the heat exchange member is disposed between adjacent battery units.

6. The battery pack according to claim 1 , wherein 80%≤L 1 /L 2 ≤90%.

7. A vehicle, comprising a vehicle body and a battery pack, the battery pack being disposed in the vehicle body, wherein the battery pack comprising a battery module and a case;

wherein the case has a containing chamber, and the battery module is located in the containing chamber;

the battery module comprises a plurality of battery units arranged in a horizontal direction, and each battery unit at least comprises one battery cell;

a size of the battery module in the horizontal direction is larger than a size of the battery module in a vertical direction; and

the size of the battery module in the vertical direction is L 1 , and a size of the battery pack in the vertical direction is L 2 , where 70%≤L 1 /L 2 ≤95%;

wherein the battery cell comprises an electrode assembly, a housing and a top cover assembly, the electrode assembly is housed in the housing, and the top cover assembly is connected to the housing; and

the housing comprises two first side walls and two second side walls, the first side walls face each other in the vertical direction, the second side walls face each other in the horizontal direction, and an area of the first side wall is larger than an area of the second side wall;

wherein the case comprises an upper case cover and a lower case arranged in the vertical direction, the upper case cover is connected to the lower case, and the containing chamber is formed between the upper case cover and the lower case; and

the battery module is fixed to the lower case;

wherein in the vertical direction, the battery module and the upper case cover are spaced by a certain distance, and the battery module and the lower case are spaced by a certain distance.

8. A method for producing a battery pack, comprising:

providing a case, the case being configured to have a containing chamber; and

providing a battery module, the battery module being configured to be located in the containing chamber, the battery module comprising a plurality of battery units arranged in a horizontal direction, and each battery unit at least comprising one battery cell;

wherein a size of the battery module in the horizontal direction is larger than a size of the battery module in a vertical direction; and

the size of the battery module in the vertical direction is L1, and a size of the battery pack in the vertical direction is L2, wherein 70%≤L1/L2≤95%;

wherein the battery cell comprises an electrode assembly, a housing and a top cover assembly, the electrode assembly is housed in the housing, and the top cover assembly is connected to the housing; and

the housing comprises two first side walls and two second side walls, the first side walls face each other in the vertical direction, the second side walls face each other in the horizontal direction, and an area of the first side wall is larger than an area of the second side wall;

wherein the case comprises an upper case cover and a lower case arranged in the vertical direction, the upper case cover is connected to the lower case, and the containing chamber is formed between the upper case cover and the lower case; and

the battery module is fixed to the lower case;

wherein in the vertical direction, the battery module and the upper case cover are spaced by a certain distance, and the battery module and the lower case are spaced by a certain distance.

9. The vehicle according to claim 7 , wherein each battery unit comprises a plurality of battery cells stacked in the vertical direction.

10. The vehicle according to claim 7 , wherein

the electrode assembly comprises a first electrode sheet, a second electrode sheet and a diaphragm, and the diaphragm isolates the first electrode sheet from the second electrode sheet;

the first electrode sheet, the diaphragm and the second electrode sheet are coiled into a flat shape, or the first electrode sheet, the diaphragm and the second electrode sheet are stacked in the vertically direction; and

the electrode assembly has two wide surfaces and two narrow surfaces, the wide surface and the first side wall face each other in the vertical direction, and the narrow surface and the second side wall face each other in the horizontal direction.

11. The vehicle according to claim 7 , wherein

the battery pack further comprises a heat exchange member, and the heat exchange member is disposed on one side of the battery module in the vertical direction; and

a size of the heat exchange member in the vertical direction is L 3 , wherein 70%≤(L 1 +L 3 )/L 2 ≤95%.

12. The vehicle according to claim 7 , wherein the battery pack further comprises a heat exchange member, and the heat exchange member is disposed between adjacent battery units.

13. The vehicle according to claim 7 , wherein 80%≤L 1 /L 2 ≤90%.