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F.10.2.1 Design of the Accumulator Container must be documented in the SES.
Documentation includes materials used, drawings/images, fastener locations, cell/segment weight and cell/segment position.
F.10.2.2 Accumulator Container design requirements:
a. The floor or bottom must be constructed of steel 1.25 mm minimum thickness or aluminum 3.2 mm minimum thickness.
b. The external vertical walls must be constructed of steel 0.9 mm minimum thickness or aluminum 2.3 mm minimum thickness.
c. Internal vertical walls separating cells and/or segments must be:
Minimum of 75 percent of the height of the external vertical walls
Constructed of steel 0.9 mm minimum thickness or aluminum 2.3 mm minimum thickness
d. The floor and walls must be joined by welds and/or fasteners. Any fasteners must be 6
mm or 1/4” minimum diameter Critical Fasteners, see T.8.2
e. Internal vertical walls divide the Accumulator Container into “Sections”:
A maximum of 12 kg is allowed in any Section
Fastened connections between the floor and any vertical wall of each Section must have minimum of two fasteners.
Fastened connections between internal vertical walls and external vertical walls must be located in the top half of the internal vertical wall.
Sections containing 8 kg or less must have a minimum of two fasteners connecting any two vertical walls.
Sections containing between 8 kg and 12 kg must have a minimum of three fasteners connecting any two vertical walls.
Folding or bending plate material to create flanges or to eliminate joints between walls is recommended.
Example: An Accumulator Container with 2 internal walls has 3 Sections. Each Section contains less than 8 kg. Therefore 18 floor to wall joints are required in total with minimum two fasteners per joint.
f. Covers and lids must be constructed of steel 0.9 mm minimum thickness or aluminum
2.3 mm minimum thickness.
g. Covers and lids must be fastened with a minimum of one fastener for each external vertical wall per section.
h. Alternate / Composite materials are allowed with proof of equivalency per F.4.3.
i. Substituting one 6 mm or 1/4” bolt with two 5 mm or #12 bolts or three 4 mm or #10
bolts is allowed.
The Accumulator Container design guidelines are intended to generate a structure that does not fail under the following accelerations:
40 g in the longitudinal direction (forward/aft) 40 g in the lateral direction (left/right)
20 g in the vertical direction (up/down)
F.10.2.3 The cells and/or segments must be appropriately secured against moving inside the Container.
a. This mounting system must be designed to withstand the following accelerations: 40 g in the longitudinal direction (forward/aft)
40 g in the lateral direction (left/right) 20 g in the vertical direction (up/down)
b. Calculations and/or tests proving these requirements are met must be included in the SES.
c. Any fasteners must be 6 mm or 1/4” minimum diameter Critical Fasteners, see T.8.2
F.10.2.5 Composite Accumulator Containers must satisfy the following requirements:
a. Data obtained from laminate perimeter shear strength and 3 point bending tests (F.4.3) must be used for any strength calculations.
b. The calculations and physical test results must be included in the SES.