# US 2023/0411801 A1 · Battery pack > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2023/0411801 A1 - Document ID: US20230411801A1 - Status: Published application - Kind: A1 - Application number: 18/337,642 - Filed: 2023-06-20 - Published: 2023-12-21 - Earliest claimed: 2022-06-21 - Applicants: Milwaukee Electric Tool Corporation - Inventors: Wyatt R. Silha; Carmen J. Castaños; Zachery Meyer; Eli M. Zidel; Jonathan D. Quenzer - Web page: https://patentgrep.com/patent/US20230411801A1 ## CPC - H01M 50/519: comprising printed circuit boards [PCB] - H01M 10/425: {Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing (printed circuits H05K1/00)} - H01M 10/482: {for several batteries or cells simultaneously or sequentially} - H01M 10/486: {for measuring temperature} - H01M 10/653: characterised by electrically insulating or thermally conductive materials - H01M 50/211: adapted for pouch cells - H01M 50/242: adapted for protecting batteries against vibrations, collision impact or swelling - H01M 50/247: specially adapted for portable devices, e.g. mobile phones, computers, hand tools or pacemakers - H01M 50/284: with incorporated circuit boards, e.g. printed circuit boards [PCB] - H01M 50/287: Fixing of circuit boards to lids or covers - H01M 50/289: characterised by spacing elements or positioning means within frames, racks or packs (spacing elements inside cells other than separators, membranes or diaphragms H01M50/471) - H01M 50/296: characterised by terminals of battery packs (terminals of batteries H01M50/543) - H05K 1/056: {the metal substrate being covered by an organic insulating layer} - H01M 2010/4271: {Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing} - H05K 1/0209: {External configuration of printed circuit board adapted for heat dissipation, e.g. lay-out of conductors, coatings} - H05K 1/0271: {Arrangements for reducing stress or warp in rigid printed circuit boards, e.g. caused by loads, vibrations or differences in thermal expansion} - H05K 2201/09063: Holes or slots in insulating substrate not used for electrical connections - H05K 2201/10037: Printed or non-printed battery - Y02E 60/10: Energy storage using batteries - H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY - H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION ## Abstract A battery pack is configured to be coupled to an electrical device. The battery pack includes a battery cell; a printed circuit board (PCB) having a metal base layer; and an intermediate layer positioned between the battery cell and the PCB, the intermediate layer including a first section formed of a first material and a second section formed of a second material, the first material having a lower thermal conductivity than the second material. ## Claims ### Claim 1 A battery pack comprising: a battery cell; a first printed circuit board (PCB) electrically connected to the battery cell, the first PCB including an aluminum base layer; and a second PCB electrically connected to the first PCB, the second PCB disposed on a side of the first PCB opposite that of the battery cell. ### Claim 2 (depends on 1) The battery pack of claim 1, further comprising a thermal insulation layer positioned at least partially between the PCB and the battery cell. ### Claim 3 (depends on 1) The battery pack of claim 1, wherein the second PCB includes no aluminum, and wherein the battery cell is a pouch cell. ### Claim 4 (depends on 1) The battery pack of claim 1, further comprising a terminal that outputs an electrical current, the terminal mounted to the second PCB. ### Claim 5 (depends on 1) The battery pack of claim 1, wherein the battery cell is one of a plurality of battery cells, wherein an inner housing of the battery pack contains the plurality of battery cells, and wherein the first PCB contacts three walls of the inner housing. ### Claim 6 (depends on 5) The battery pack of claim 5, wherein a compressible lining is affixed each of the three walls of the inner housing and in contact with the plurality of battery cells. ### Claim 7 (depends on 5) The battery pack of claim 5, wherein a gap pad is positioned between each of the plurality of battery cells, and wherein the gap pad is affixed to each of the adjacent battery cells. ### Claim 8 (depends on 5) The battery pack of claim 5, wherein a top pad is affixed to a top battery cell of the plurality of battery cells. ### Claim 9 (depends on 5) The battery pack of claim 5, further comprising a coating material covering the first PCB, the second PCB, and the plurality of battery cells, and wherein the coating material includes a polymer. ### Claim 10 (depends on 1) The battery pack of claim 1, wherein the second PCB is mounted to the first PCB, the second PCB is offset from the first PCB by a plurality of posts, and each of the plurality of posts is affix to the first PCB with epoxy. ### Claim 11 (depends on 1) The battery pack of claim 1, further comprising: a positive cell strap electrically connected to the first PCB, wherein the aluminum base layer of the first PCB dissipates heat from the positive cell strap, and a negative cell strap electrically connected to the first PCB, wherein the aluminum base layer of the first PCB dissipates heat from the negative cell strap. ### Claim 12 A battery pack comprising: a battery cell; a printed circuit board (PCB) having a metal base layer; and an intermediate layer positioned between the battery cell and the PCB, the intermediate layer including a first section formed of a first material and a second section formed of a second material, the first material having a lower thermal conductivity than the second material. ### Claim 13 (depends on 12) The battery pack of claim 12, further comprising a sense resistor coupled to the PCB opposite the PCB from the first section of the intermediate layer. ### Claim 14 (depends on 12) The battery pack of claim 12, further comprising a field-effect transistor coupled to the PCB opposite the PCB opposite from the first section of the intermediate layer. ### Claim 15 (depends on 12) The battery pack of claim 12, further comprising a thermistor coupled to the PCB opposite the PCB from the second section of the intermediate layer, wherein the thermistor is one of a plurality of thermistors coupled to the PCB opposite the PCB from the second section of the intermediate layer. ### Claim 16 (depends on 12) The battery pack of claim 12, wherein the PCB further includes a first surface and a second surface opposite the first surface, wherein the second surface is closer to the battery cell than the first surface, wherein the first section of the intermediate layer covers more than half of the second surface of the PCB, and wherein the first section of the intermediate layer covers two-thirds of the second surface of the PCB. ### Claim 17 (depends on 12) The battery pack of claim 12, wherein the PCB further includes a first surface forming an interior portion and a second surface forming a perimeter portion. ### Claim 18 (depends on 12) The battery pack of claim 12, wherein the metal base layer has a thermal conductivity that is in a range of 80 Watts per meter-Kelvin (W/mK) to 260 W/mK. ### Claim 19 (depends on 12) The battery pack of claim 12, wherein the metal base layer includes aluminum. ### Claim 20 (depends on 12) The battery pack of claim 12, further comprising a positive cell strap and a negative cell strap coupled to the PCB opposite the PCB from the first section of the intermediate layer.