# US 2021/0175480 A1 · Serviceable battery pack assembly > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0175480 A1 - Document ID: US20210175480A1 - Status: Published application - Kind: A1 - Application number: 16/709,031 - Filed: 2019-12-10 - Published: 2021-06-10 - Earliest claimed: 2019-12-10 - Assignees: GM Global Technology Operations LLC - Applicants: GM Global Technology Operations LLC - Inventors: Andrew W. White; Terry A. Swartzell; James A. Rochon; Terry J. Short; Charles E. Jensen - Web page: https://patentgrep.com/patent/US20210175480A1 ## CPC - H01M 50/209: adapted for prismatic or rectangular cells (H01M50/216 takes precedence) - H01M 50/249: specially adapted for aircraft or vehicles, e.g. cars or trains (constructional details of batteries specially adapted for electric vehicles B60L50/64) - H01M 50/10: Primary casings; Jackets or wrappings - Y02E 60/10: Energy storage using batteries - Y02T 10/70: Energy storage systems for electromobility, e.g. batteries - H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract An serviceable battery pack and assembly method may include a battery pack having a stanchion extending through a wall of the battery pack, a first battery pack seal between the stanchion and the wall of the battery pack, attachment of the battery pack at the exterior of a floor pan of a vehicle at the stanchion, and a second battery pack seal between the exterior of the floor pan and the wall of the battery pack surrounding the stanchion. ## Claims ### Claim 1 An attachment system for a serviceable battery pack, comprising: a battery pack comprising a first enclosure wall having a respective inner side, a respective outer side and defining a respective opening therethrough; a stanchion comprising an interior portion inside the battery pack and a first exterior portion extending from the interior portion through the first enclosure wall opening to outside the battery pack, the interior portion including a first flange larger than the first enclosure wall opening, the stanchion including a first set of threads on the first exterior portion; a first gasket trapped between the first flange and the inner side of the first enclosure wall; a first nut engaging the first set of threads and configured to compress the first enclosure wall between the first nut and the first flange; a battery pack attachment structure comprising a first surface facing the outer side of the first enclosure wall and defining a respective opening therethrough, the first enclosure wall opening and the battery pack attachment structure opening being substantially concentric; a threaded attachment fastener configured to draw the stanchion and the battery pack attachment structure together; and a first seal disposed between the first enclosure wall and the battery pack attachment structure. ### Claim 2 (depends on 1) The system of claim 1, comprising: the first seal disposed between the first enclosure wall and the battery pack attachment structure comprising a compressible gasket surrounding the first nut. ### Claim 3 (depends on 1) The system of claim 1, comprising: the battery pack comprising a second enclosure wall opposite to and spaced from the first enclosure wall and having a respective inner side, a respective outer side and defining a respective opening therethrough; the stanchion comprising a second exterior portion, the interior portion of the stanchion being intermediate the first and second exterior portions, the second exterior portion extending through the second enclosure wall opening to outside the battery pack, the interior portion including a second flange larger than the second enclosure wall opening, the stanchion including a second set of threads on the second exterior portion; a second gasket trapped between the second flange and the inner side of the second enclosure wall; and a second nut engaging the second set of threads and configured to compress the second enclosure wall between the second nut and the second flange. ### Claim 4 (depends on 1) The system of claim 1, comprising: the stanchion comprising a bore through at least a part of the first exterior portion and a set of threads at the interior of the bore; and the threaded attachment fastener comprising a bolt extending through the battery pack attachment structure opening and engaging the set of threads at the interior of the bore to draw the stanchion and the battery pack attachment structure together. ### Claim 5 (depends on 3) The system of claim 3, comprising: the stanchion comprising a bore through at least a part of the first exterior portion and a set of threads at the interior of the bore; and the threaded attachment fastener comprising a bolt extending through the battery pack attachment structure opening and engaging the set of threads at the interior of the bore to draw the stanchion and the battery pack attachment structure together. ### Claim 6 (depends on 3) The system of claim 3, comprising: the stanchion comprising a first bore through at least a part of the first exterior portion and a first set of threads at the interior of the first bore, a second bore through at least a part of the second exterior portion and a second set of threads at the interior of the second bore; the threaded attachment fastener comprising a first bolt extending through the battery pack attachment structure opening and engaging the first set of threads at the interior of the first bore to draw the stanchion and the battery pack attachment structure together; a second seal disposed between the outer side of the second enclosure wall and a washer; and a second bolt extending through the washer and the second enclosure wall opening and engaging the second set of threads at the interior of the second bore. ### Claim 7 (depends on 3) The system of claim 3, comprising: the stanchion comprising a longitudinal bore therethrough; and the threaded attachment fastener comprising a bolt having a head and an opposite threaded end, the bolt inserted completely through the stanchion bore and battery pack attachment structure opening and terminating at a third nut. ### Claim 8 (depends on 7) The system of claim 7, comprising: the bolt inserted with the head proximate the second exterior portion of the stanchion; and the third nut proximate the first exterior portion of the stanchion. ### Claim 9 (depends on 7) The system of claim 7, comprising: the bolt inserted with the head proximate the first exterior portion of the stanchion; and the third nut proximate the second exterior portion of the stanchion. ### Claim 10 (depends on 8) The system of claim 8, comprising: a second seal disposed between the outer side of the second enclosure wall and a washer; and the washer disposed between the second seal and the head of the bolt. ### Claim 11 (depends on 1) The system of claim 1, comprising: the battery pack comprising a second enclosure wall opposite to and spaced from the first enclosure wall and having a respective inner side, a respective outer side and defining a respective opening therethrough; the stanchion extending from the first exterior portion at least to the second enclosure wall, the stanchion further including a longitudinal bore therethrough substantially concentric with the second enclosure wall opening; the stanchion sealably affixed to the second enclosure wall; and the threaded attachment fastener comprising a bolt having a head and an opposite threaded end, the bolt inserted completely through the stanchion bore, the battery pack attachment structure opening, the second enclosure wall opening, and terminating at a second nut. ### Claim 12 An attachment system for a serviceable battery pack, comprising: a battery pack comprising an enclosure wall having an inner side, an outer side and defining a respective opening therethrough; a stanchion comprising an interior portion inside the battery pack and an exterior portion extending from the interior portion through the enclosure wall opening to outside the battery pack, the interior portion including a flange larger than the enclosure wall opening, the stanchion including a first set of external threads on the exterior portion and a second set of threads; a gasket trapped between the flange and the inner side of the enclosure wall; a first nut engaging the first set of external threads and configured to compress the enclosure wall between the first nut and the flange; a battery pack attachment structure comprising a first surface facing the outer side of the enclosure wall and defining a respective opening therethrough, the enclosure wall opening and the battery pack attachment structure opening being substantially concentric; a threaded attachment fastener engaging the second set of threads and configured to draw the stanchion and the battery pack attachment structure together; and a seal disposed between the enclosure wall and the battery pack attachment structure. ### Claim 13 (depends on 12) The system of claim 12, comprising: the stanchion comprising a bore through at least a part of the exterior portion, the second set of threads comprising internal threads at the interior of the bore; and the threaded attachment fastener comprising a bolt extending through the battery pack attachment structure opening and engaging the second set of threads to draw the stanchion and the battery pack attachment structure together. ### Claim 14 (depends on 13) The system of claim 13, comprising: the seal disposed between the enclosure wall and the battery pack attachment structure comprising a compressible gasket surrounding the first nut. ### Claim 15 (depends on 12) The system of claim 12, comprising: the exterior portion of the stanchion further having a part thereof extending through the battery pack attachment structure opening; the second set of threads comprising a portion of the first set of external threads on the part of the exterior portion extending through the battery pack attachment structure opening; and the threaded attachment fastener comprising a second nut engaging the second set of threads and configured to compress the battery pack attachment structure between the second nut and the first nut. ### Claim 16 (depends on 12) The system of claim 12, comprising: the exterior portion of the stanchion further having a part extending through the battery pack attachment structure opening, the part of the exterior portion extending through the battery pack attachment structure opening comprising a stepped diameter providing a shoulder; the second set of threads comprising a second set of external threads on the part of the exterior portion extending through the battery pack attachment structure opening; and the threaded attachment fastener comprising a second nut engaging the second set of threads and configured to compress the battery pack attachment structure between the second nut and the shoulder. ### Claim 17 An assembly method for a serviceable battery pack, comprising: providing a battery pack including a stanchion extending through a wall of the battery pack; providing a first battery pack seal between the stanchion and the wall of the battery pack; attaching the battery pack at the exterior of a floor pan of a vehicle at the stanchion; and providing a second battery pack seal between the exterior of the floor pan and the wall of the battery pack surrounding the stanchion. ### Claim 18 (depends on 17) The assembly method of claim 17, comprising: providing the first battery pack seal between the stanchion and the wall of the battery pack, comprising: providing the stanchion comprising a shoulder inside the battery pack; providing external threads on a part of the stanchion outside the battery pack; and compressing the wall of the battery pack toward the shoulder with a nut engaging with the external threads. ### Claim 19 (depends on 17) The assembly method of claim 17, comprising: attaching the battery pack at the exterior of the floor pan of the vehicle at the stanchion, comprising: providing the stanchion comprising a bore through at least a part of the stanchion extending through the wall of the battery pack; providing internal threads at the interior of the bore; and providing a bolt extending through the floor pan of the vehicle and engaging with the internal threads. ### Claim 20 (depends on 18) The assembly method of claim 18, comprising: attaching the battery pack at the exterior of the floor pan of the vehicle at the stanchion, comprising: providing the stanchion comprising a bore through at least a part of the stanchion extending through the wall of the battery pack; providing internal threads at the interior of the bore; and providing a bolt extending through the floor pan of the vehicle and engaging with the internal threads; providing the second battery pack seal between the exterior of the floor pan and the wall of the battery pack surrounding the stanchion, comprising: providing a compressible gasket between the exterior of the floor pan and the wall of the battery pack surrounding the nut; and compressing the compressible gasket between the exterior of the floor pan and the wall of the battery pack surrounding the nut with the bolt extending through the floor pan of the vehicle and engaging with the internal threads.