# US 12,009,542 B2 · Battery pack and electric vehicle > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,009,542 B2 - Document ID: US12009542B2 - Status: Granted - Kind: B2 - Application number: 17/281,358 - Filed: 2020-06-18 - Published: 2022-06-23 - Granted: 2024-06-11 - Earliest claimed: 2020-06-18 - Assignees: Dongguan Poweramp Technology Limited - Applicants: Dongguan Poweramp Technology Limited - Inventors: Haifei Zhang - Web page: https://patentgrep.com/patent/US12009542B2 ## CPC - 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 50/30: Arrangements for facilitating escape of gases - B60L 50/64: Constructional details of batteries specially adapted for electric vehicles - H01M 10/425: {Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing (printed circuits H05K1/00)} - H01M 50/186: characterised by the disposition of the sealing members - H01M 50/209: adapted for prismatic or rectangular cells (H01M50/216 takes precedence) - 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 50/293: characterised by the material - H01M 50/3425: {in the form of rupturable membranes or weakened parts, e.g. pierced with the aid of a sharp member} - H01M 50/242: adapted for protecting batteries against vibrations, collision impact or swelling - H01M 2010/4271: {Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing} - H01M 2220/20: Batteries in motive systems, e.g. vehicle, ship, plane - Y02E 60/10: Energy storage using batteries - H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY - B60L: PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES (arrangements or mounting of electrical propulsion units or of plural diverse prime-movers for mutual or common propulsion in vehicles B60K1/00, B60K6/20; arrangements or mounting of electrical gearing in vehicles B60K17/12, B60K17/14; preventing wheel slip by reducing power in rail vehicles B61C15/08; dynamo-electric machines H02K; control or regulation of electric motors H02P); SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES (electric coupling devices combined with mechanical couplings of vehicles B60D1/64; electric heating for vehicles B60H1/00); ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL (control or regulation of electric motors H02P); MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION ## Abstract A battery pack includes a housing, a battery cell assembly, a first separator, a pressure relief portion, and glue. The first separator is disposed between the housing and a first side of the battery cell assembly, and is deformed when a temperature is higher than a first threshold. The glue fills a clearance between the housing and at least a partial area outside the first side of the battery cell assembly and is configured to fasten the battery cell assembly to the housing. When thermal runaway occurs in the battery pack, the first separator is thermally deformed to form a first pressure relief channel between the housing and the first side of the battery cell assembly. Then, high-temperature gas can smoothly escape from the battery pack through the first pressure relief channel and the pressure relief portion. ## Claims ### Claim 1 A battery pack, comprising: a housing provided with an accommodating cavity; a battery cell assembly comprising a plurality of battery cells and accommodated in the accommodating cavity; a first separator disposed between the housing and a first side of the battery cell assembly, the first separator thermally deforms at a temperature higher than a first threshold so that a first pressure relief channel is formed between the first side of the battery cell assembly and the housing; a pressure relief portion disposed in the housing, wherein the pressure relief portion is in contact with the first separator or an air channel is provided between the pressure relief portion and the first separator; and a glue filling a clearance between the housing and at least a partial area outside the first side of the battery cell assembly to fasten the battery cell assembly to the housing; wherein a battery cell comprises an electrode assembly, a packaging bag, and a first tab; the electrode assembly is disposed inside the packaging bag, the first tab extends from the packaging bag, the packaging bag is provided with a weakness portion, strength of the weakness portion is less than strength of other portions of the packaging bag, and the weakness portion is disposed between the first separator and the electrode assembly. ### Claim 2 (depends on 1) The battery pack according to claim 1, wherein the packaging bag is provided with a sealing portion, the sealing portion comprises a first sealing portion, the first tab extends out of the packaging bag from the first sealing portion, and the weakness portion comprises a first weakness portion disposed at the first sealing portion, strength of the first weakness portion is less than strength of other portions of the packaging bag. ### Claim 3 (depends on 1) The battery pack according to claim 1, wherein the housing comprises a bottom wall and a plurality of side walls, the bottom wall and the plurality of side walls form the accommodating cavity, and the first separator is disposed between the battery cell assembly and one of the plurality of side walls. ### Claim 4 (depends on 1) The battery pack according to claim 1 wherein the first separator is configured to shrink when the temperature of the first separator is higher than the first threshold. ### Claim 5 (depends on 4) The battery pack according to claim 4, wherein the glue comprises potting glue. ### Claim 6 (depends on 4) The battery pack according to claim 4, wherein the first threshold is lower than a thermal runaway temperature of the battery cell assembly. ### Claim 7 (depends on 4) The battery pack according to claim 4, wherein the battery pack further comprises a circuit board and a mounting bracket that are accommodated in the accommodating cavity, the circuit board is fixed to the mounting bracket, and the air channel comprises a first air channel disposed on the mounting bracket. ### Claim 8 (depends on 7) The battery pack according to claim 7, wherein the mounting bracket comprises a first bracket and a second bracket, both the circuit board and the second bracket are fixed to the first bracket, a clearance is provided between the first bracket and the second bracket; the battery pack further comprises a flexible circuit board connected to the battery cell, the flexible circuit board passes through the clearance and is fixed to the circuit board, and the first air channel is disposed on the first bracket and/or the second bracket. ### Claim 9 (depends on 8) The battery pack according to claim 8, further comprising copper bars, the second bracket is configured to mount the copper bars; one end of the copper bars located away from the second bracket is connected to a positive electrode or a negative electrode of the battery cell assembly. ### Claim 10 (depends on 4) The battery pack according to claim 4, wherein the battery cell assembly comprises a separator disposed between the plurality of battery cells, to prevent passage of the glue. ### Claim 11 (depends on 4) The battery pack according to claim 4, wherein the first separator comprises an elastic piece and an air-permeable structure. ### Claim 12 (depends on 1) The battery pack according to claim 1, wherein the pressure relief portion is a pressure relief hole provided in or an explosion-proof structure disposed in the housing, and the explosion-proof structure comprises an explosion-proof piece. ### Claim 13 (depends on 12) The battery pack according to claim 12, wherein the pressure relief hole comprises a display light hole and/or a key hole provided in the housing and communicating with the accommodating cavity. ### Claim 14 (depends on 1) An electric vehicle, comprising the battery pack according to claim 1. ### Claim 15 A battery pack, comprising: a housing provided with an accommodating cavity; a battery cell assembly comprising a plurality of battery cells and accommodated in the accommodating cavity; a first separator disposed between the housing and a first side of the battery cell assembly, the first separator thermally deforms at a temperature higher than a first threshold so that a first pressure relief channel is formed between the first side of the battery cell assembly and the housing; a pressure relief portion disposed in the housing, wherein the pressure relief portion is in contact with the first separator or an air channel is provided between the pressure relief portion and the first separator; and a battery cell comprises an electrode assembly, a packaging bag, and a first tab; the electrode assembly is disposed inside the packaging bag, the first tab extends from the packaging bag, the packaging bag is provided with a weakness portion, strength of the weakness portion is less than strength of other portions of the packaging bag, and the weakness portion is disposed between the first separator and the electrode assembly. ### Claim 16 (depends on 15) The battery pack according to claim 15, wherein the packaging bag is provided with a sealing portion, the sealing portion comprises a first sealing portion, the first tab extends out of the packaging bag from the first sealing portion, and the weakness portion comprises a first weakness portion disposed at the first sealing portion, strength of the first weakness portion is less than strength of other portions of the packaging bag. ### Claim 17 (depends on 16) The battery pack according to claim 16, wherein the first separator is configured to shrink when the temperature of the first separator is higher than the first threshold. ### Claim 18 (depends on 17) The battery pack according to claim 17, further comprising a circuit board and a mounting bracket accommodated in the accommodating cavity, the circuit board is fixed to the mounting bracket, and the air channel comprises a first air channel disposed on the mounting bracket. ### Claim 19 (depends on 18) The battery pack according to claim 18, wherein the mounting bracket comprises a first bracket and a second bracket, both the circuit board and the second bracket are fixed to the first bracket, a clearance is provided between the first bracket and the second bracket, the battery pack further comprises a flexible circuit board connected to the battery cell, the flexible circuit board passes through the clearance and is fixed to the circuit board, and the first air channel is disposed on the first bracket and/or the second bracket.