Battery submodule assembly fixture with multiple actuators

1. A system, comprising:

a first holder that is configured to hold a plurality of layers associated with a battery submodule that is being assembled, wherein the first holder includes a first L-shaped part and a second L-shaped part separated from each other at least by a width of the plurality of layers, wherein an elongated portion of the first L-shaped part or the second L-shaped part extend along a side of the plurality of layers, wherein a short portion of the first L-shaped part or the second L-shaped part is provided at a bottom surface of the plurality of layers, wherein only a portion of the bottom surface of the plurality of layers rest on the short portion;

a first pair of actuators and a second pair of actuators that are configured to, while the plurality of layers is held by the first holder, extend so that the first pair of actuators and the second pair of actuators apply pressure to the plurality of layers, wherein: while the first pair of actuators and the second pair of actuators are extended and applying pressure to the plurality of layers, the first holder retracts by moving the first L-shaped part and the second L-shaped part away from each other and away from the plurality of layers; and

a second holder that is configured to hold a container associated with the battery submodule that is being assembled and extend so that the container gradually surrounds the plurality of layers, wherein: while the container gradually surrounds the plurality of layers, the first pair of actuators and the second pair of actuators sequentially retract.

2. The system recited in claim 1 , wherein:

the first pair of actuators includes a first top actuator and a first bottom actuator;

the second pair of actuators includes a second top actuator and a second bottom actuator; and

the first pair of actuators and the second pair of actuators are configured to extend and retract along a vertical axis.

3. The system recited in claim 1 , wherein:

the first pair of actuators includes a first top actuator and a first bottom actuator;

the second pair of actuators includes a second top actuator and a second bottom actuator;

the first top actuator and the second top actuator are configured to extend and come into contact with a topmost layer in the plurality of layers; and

the first bottom actuator and the second bottom actuator are configured to extend and come into contact with a bottommost layer in the plurality of layers.

4. The system recited in claim 1 , wherein a last pair of actuators that is last to sequentially retract has tips with a strictly larger surface area compared to other pairs of actuators.

5. A method, comprising:

using a first holder to hold a plurality of layers associated with a battery submodule that is being assembled, wherein the first holder includes a first L-shaped part and a second L-shaped part separated from each other at least by a width of the plurality of layers;

using a first pair of actuators and a second pair of actuators to, while the plurality of layers is held by the first holder, extend so that the first pair of actuators and the second pair of actuators apply pressure to the plurality of layers,

retracting the first holder while the first pair of actuators and the second pair of actuators are extended and applying pressure to the plurality of layers, retracting includes:

moving the first L-shaped part and the second L-shaped part away from each other and away from the plurality of layers;

using a second holder to hold a container associated with the battery submodule that is being assembled and extend so that the container gradually surrounds the plurality of layers

sequentially retracting the first pair of actuators and the second pair of actuators while the container gradually surrounds the plurality of layers.

6. The method recited in claim 5 , wherein:

the first pair of actuators includes a first top actuator and a first bottom actuator;

the second pair of actuators includes a second top actuator and a second bottom actuator; and

the first pair of actuators and the second pair of actuators are configured to extend and retract along a vertical axis.

7. The method recited in claim 5 , wherein:

the first pair of actuators includes a first top actuator and a first bottom actuator;

the second pair of actuators includes a second top actuator and a second bottom actuator;

the first top actuator and the second top actuator are configured to extend and come into contact with a topmost layer in the plurality of layers; and

the first bottom actuator and the second bottom actuator are configured to extend and come into contact with a bottommost layer in the plurality of layers.

8. The method recited in claim 5 , wherein a last pair of actuators that is last to sequentially retract has tips with a strictly larger surface area compared to other pairs of actuators.

9. The system recited in claim 1 , wherein the first pair of actuators and the second pair of actuators directly contact a top surface and the bottom surface of the plurality of layers to apply pressure to the plurality of layers.

10. The method recited in claim 5 , wherein the first pair of actuators and the second pair of actuators directly contact a top surface and a bottom surface of the plurality of layers to apply pressure to the plurality of layers.

11. The method recited in claim 5 , wherein an elongated portion of the first L-shaped part or the second L-shaped part extend along a side of the plurality of layers, wherein a short portion of the first L-shaped part or the second L-shaped part is provided at a bottom surface of the plurality of layers, wherein only a portion of the bottom surface of the plurality of layers rest on the short portion.