LiPo pouch electrode stacking alignment review: Naming the Condition Before the Verdict
Two teams can hold the same stack alignment record and still disagree about the jelly-roll datum, because nobody wrote down the goods-in check behind it. Hold the gate open. We read the design verification plan first, since it names which jelly-roll datum belongs to the joint and which stays with the LiPo pouch cell. The cost is one extra row inside the reviewed file index. That row decides whether the next reader inherits a method or a guess. The stack alignment record is written so a second team reaches the same jelly-roll datum.
Key Takeaways
- Write the formation rest beside the separator overhang; a value without its condition is a guess with a signature.
- Give every open row a named owner and a closure gate before the stack alignment record leaves the room.
- We would open the four-wire (Kelvin) measurement first because it fixes which stack pressure band the reading actually describes.
- A change to the pouch fold clearance re-opens the method, the criterion and the evidence gathered under the earlier thermal hold.
The LiPo technical library index that keeps the post-stack inspection and the method in the same wording makes one stack alignment record comparable with the next review.
Where the internal short path first surfaces in the stack alignment record
Stack alignment 1: Check the electrode edge burr again
We ask which document is authoritative when the drawing, the brief and the inspection sheet disagree about the stack pressure band. Write the delta down. We put that answer in the stack alignment record before the review closes, because the internal short path often starts exactly at this disagreement. If nobody can answer, the stack pressure band row stays open with a named owner and a gate. A slower start here buys a faster finish beside the release checklist, once the electrode edge position is filed in the stack alignment record.
Stack alignment 2: Set the review gate
Someone who missed the meeting should be able to read the stack alignment record, find the pouch fold clearance, identify the thermal hold and see who accepted the row. Cold soak changes that. That reader will ask whether the assembly was in a released or a build state and which revision of the formation gas record applies. Keep the requirement line, the method, the file provided for review and the open pouch fold clearance rows visible. A summary that hides them cannot be audited.
The configuration discussion can start from the LiPo pouch configuration range range once the pouch fold clearance and the thermal hold are written down.
What the formation gas record settles before sign-off
Stack alignment 11: Version the file
Consider the separator overhang shift from the reviewer's side. A reading taken at the wrong goods-in check will be defended as a component verdict, and the anode overhang margin in the stack alignment record will not explain why. Keep the artefact visible. We would ask for the design verification plan before opening a cell-lot investigation, because the sense point decides what the number contains. We would ask that question first on the assembly bench. The question is cheaper.
Stack alignment 12: Re-open linked rows
We walk the stack alignment record against the physical assembly before sign-off. Check the millivolt plateau slope, the separator overhang and the post-stack inspection against what is actually on the bench, then freeze the reviewed stack alignment record as a controlled baseline. Small cost, clear trace. The pouch swelling recorded under one post-stack inspection should stay open under another. That last walk costs ten minutes at the incoming inspection bay. It is the part most teams skip.
Stack alignment 13: Walk the assembly
We log the formation gas pocket and the thermal hold in the same row before the internal short path is discussed. Two files, one baseline. The internal short path seldom announces itself at goods-in; it shows up after the formation rest once the stack alignment record already carries a sign-off. We would check the formation gas record first, because it declares which formation gas pocket belongs to the joint and which stays inside the LiPo pouch cell. The cost is one extra row before the outline is frozen.
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When the cold soak moves the tab exit offset answer
We leave behind something the next programme can reuse, keeping the separator overhang visible in the stack alignment record. Write the electrode edge burr, the formation rest and the stack alignment record in one row, with the interface control document and the review gate attached. Cold soak changes that. When another team asks for the same LiPo pouch cell under a different post-stack inspection, that structure lets them compare like with like. No client names, no claimed approvals and no asserted outcomes belong in the stack alignment record. Only the method, the formation rest and the open items.
The stack alignment record either names the formation rest or it leaves the electrode edge burr row open. Cold soak changes that.
Who signs the electrode edge burr row in the stack alignment record
Stack alignment 31: Record the cold soak
Change control is where the stack alignment record proves itself. A revised tab exit offset re-opens the criteria written for the earlier cold soak, the methods that used it and any analysis that ranked the internal short path under the old region. Write the delta down. We would ask the owner to issue a visible delta and keep the superseded rows with their history, and the jelly-roll datum logged in the stack alignment record. The cost is a second sign-off on the assembly bench, with the stack pressure band recorded in the stack alignment record. It is smaller than discovering the mismatch at goods-in, once the pouch fold clearance is filed in the stack alignment record.
Stack alignment 32: Bind the interface control document to the row
We leave behind something the next programme can reuse, keeping the electrode edge position visible in the stack alignment record. Write the electrode edge burr, the formation rest and the stack alignment record in one row, with the interface control document and the review gate attached. Cold soak changes that. When another team asks for the same LiPo pouch cell under a different post-stack inspection, that structure lets them compare like with like. No client names, no claimed approvals and no asserted outcomes belong in the stack alignment record. Only the method, the formation rest and the open items.
Stack alignment 33: Give the stack alignment record an owner
Consider the delamination at the fold from the reviewer's side. A reading taken at the wrong goods-in check will be defended as a component verdict, and the anode overhang margin in the stack alignment record will not explain why. One row, one owner. We would ask for the design verification plan before opening a cell-lot investigation, because the sense point decides what the number contains. We would ask that question first before the outline is frozen, and the separator overhang logged in the stack alignment record. The question is cheaper.
Stack alignment 34: Check the separator overhang again
We walk the stack alignment record against the physical assembly before sign-off. Check the millivolt plateau slope, the separator overhang and the post-stack inspection against what is actually on the bench, then freeze the reviewed stack alignment record as a controlled baseline. Ask before the freeze. The electrode edge burr recorded under one post-stack inspection should stay open under another. That last walk costs ten minutes inside the reviewed file index, with the jelly-roll datum recorded in the stack alignment record. It is the part most teams skip.
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Stack alignment 90: Record the post-stack inspection
The separator overhang shift is easier to catch when the stack alignment record names the post-stack inspection. Keep the stack pressure band, the electrode edge burr and the four-wire (Kelvin) measurement in one place, with an owner attached to each open row. Name the owner now. When the stack pressure band changes, we re-open the linked rows: the criterion, the method and the evidence gathered under the earlier post-stack inspection. That discipline costs one visible delta. It prevents an afternoon of reconstruction later.
Stack alignment 91: Keep the raw observation
We ask which document is authoritative when the drawing, the brief and the inspection sheet disagree about the electrode edge burr. Cold soak changes that. We put that answer in the stack alignment record before the review closes, because the stack pressure loss often starts exactly at this disagreement. If nobody can answer, the electrode edge burr row stays open with a named owner and a gate. A slower start here buys a faster finish at the incoming inspection bay.
Stack alignment 92: Trace the reading
Someone who missed the meeting should be able to read the stack alignment record, find the formation gas pocket, identify the thermal hold and see who accepted the row. Keep the artefact visible. That reader will ask whether the assembly was in a released or a build state and which revision of the formation gas record applies. Keep the requirement line, the method, the file provided for review and the open formation gas pocket rows visible. A summary that hides them cannot be audited.
Stack alignment 93: Record the goods-in check
Change control is where the stack alignment record proves itself. A revised jelly-roll datum re-opens the criteria written for the earlier goods-in check, the methods that used it and any analysis that ranked the stack pressure loss under the old region. Log it before handoff. We would ask the owner to issue a visible delta and keep the superseded rows with their history, once the stack pressure band is filed in the stack alignment record. The cost is a second sign-off during the design freeze. It is smaller than discovering the mismatch at goods-in, keeping the pouch fold clearance visible in the stack alignment record.
Stack alignment 94: Keep the raw observation
We leave behind something the next programme can reuse, and the electrode edge position logged in the stack alignment record. Write the tab exit offset, the cold soak and the stack alignment record in one row, with the cell supplier's datasheet and the review gate attached. Name the owner now. When another team asks for the same LiPo pouch cell under a different goods-in check, that structure lets them compare like with like. No client names, no claimed approvals and no asserted outcomes belong in the stack alignment record. Only the method, the cold soak and the open items, with the separator overhang recorded in the stack alignment record.
Stack alignment 95: Trace the reading
Consider the stack pressure loss from the reviewer's side, once the jelly-roll datum is filed in the stack alignment record. A reading taken at the wrong post-stack inspection will be defended as a component verdict, and the millivolt plateau slope in the stack alignment record will not explain why. Cold soak changes that. We would ask for the four-wire (Kelvin) measurement before opening a cell-lot investigation, because the sense point decides what the number contains. We would ask that question first under the revision ledger. The question is cheaper.
Stack alignment 96: Record the formation rest
We walk the stack alignment record against the physical assembly before sign-off. Check the separator overhang, the pouch fold clearance and the formation rest against what is actually on the bench, then freeze the reviewed stack alignment record as a controlled baseline. Keep the artefact visible. The separator overhang shift recorded under one formation rest should stay open under another. That last walk costs ten minutes on the assembly bench. It is the part most teams skip.
Stack alignment 97: Keep the raw observation
We log the pouch fold clearance and the thermal hold in the same row before the stack pressure loss is discussed. Log it before handoff. The stack pressure loss seldom announces itself at goods-in; it shows up after the formation rest once the stack alignment record already carries a sign-off. We would check the formation gas record first, because it declares which pouch fold clearance belongs to the joint and which stays inside the LiPo pouch cell. The cost is one extra row inside the reviewed file index.
FAQ
In a LiPo stack alignment review, what is the smallest usable version of this file?
For the stack alignment record, each row needs a stable identifier, the requirement text, a named owner, an acceptance criterion written as a pass or fail statement, the method with its cold soak, a status and a reference to the cell supplier's datasheet. Owner, criterion and method carry the weight. If one is missing, treat the tab exit offset row as open and name someone to close it before the brief is issued.
In a LiPo stack alignment review, how is this different from a test plan or a datasheet?
For the stack alignment record, a test plan describes how verification will be executed, while this review describes why each check exists and which brief line it satisfies. A datasheet states a capability in general terms and cannot show who decided it or which condition produced it, keeping the stack pressure band visible in the stack alignment record. Keep the electrode edge burr reference in the row so all three stay aligned.
In a LiPo stack alignment review, who should own a field that is still open?
For the stack alignment record, the person accountable for the missing input should own the field, usually a systems, electrical or mechanical lead depending on the line. Record that owner beside the missing electrode edge position and the review gate at which the row closes. If the owner cannot be named, the anode overhang margin field is not ready to be tracked.
Conclusion
Hold the stack alignment record open from the first brief. Write the jelly-roll datum, the goods-in check and the owner in the same row, and let a change re-open the linked lines instead of quietly editing one cell. Send one sheet: name the jelly-roll datum and the tab exit offset you can state today, mark the open fields, attach the design verification plan and bring the open rows visible. That is enough to start the goods-in check review under the revision ledger.
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