# US 8,785,026 B2 · Protection structure forthermal dissipation and preventing thermal runaway diffusion in battery system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,785,026 B2 - Document ID: US8785026B2 - Status: Granted - Kind: B2 - Application number: 12/967,002 - Filed: 2010-12-13 - Published: 2011-06-30 - Granted: 2014-07-22 - Earliest claimed: 2009-12-25 - Assignees: Industrial Technology Research Institute - Applicants: Hsien-Lin Hu; Jenn-Dong Hwang; Cheng-Chou Wong; Chin-Chuan Chang; Sheng-Fa Yeh; Bing-Ming Lin; Yu-Min Peng - Inventors: Hsien-Lin Hu; Jenn-Dong Hwang; Cheng-Chou Wong; Chin-Chuan Chang; Sheng-Fa Yeh; Bing-Ming Lin; Yu-Min Peng - Web page: https://patentgrep.com/patent/US8785026B2 ## CPC - H01M 10/613: Cooling or keeping cold - H01M 10/617: for achieving uniformity or desired distribution of temperature - H01M 10/625: Vehicles - H01M 10/643: Cylindrical cells - H01M 10/6554: Rods or plates - H01M 10/6555: arranged between the cells - H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries - H01M 50/209: adapted for prismatic or rectangular cells (H01M50/216 takes precedence) - Y02E 60/10: Energy storage using 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 ## Abstract A protection structure for preventing thermal dissipation and thermal runaway diffusion in battery system is provided. The protection structure includes a battery module casing and at least one composite heat conduction plate. There is a plurality of unit cells disposed in the battery module casing. The composite heat conduction plate is located within the battery module casing, contacted with the battery module casing, and sandwiched between at least two of the unit cells as a heat transmission medium between the cells and the casing to control heat transmission among the cells. The composite heat conduction plate is a multilayer anisotropic heat conduction structure constituted by at least one heat conduction layer and at least one heat insulation layer. ## Claims ### Claim 1 A protection structure configured to thermal dissipation and prevent thermal runaway diffusion in a battery system, the protection structure comprising: a battery module casing disposed with a plurality of unit cells; and at least one composite heat conduction plate, located within the battery module casing, contacted with the battery module casing, and sandwiched between at least two of the unit cells, wherein the composite heat conduction plate is a multilayer anisotropic heat conduction structure, and the composite heat conduction plate comprises: two layers of the heat conduction layer; a plurality of structural supports disposed between the heat conduction layers to support the heat conduction layers and form a plurality of internal spaces; and a heat insulation material filled in the internal spaces as the heat insulation layer. ### Claim 2 (depends on 1) The protection structure configured to thermal dissipation and prevent thermal runaway diffusion in the battery system as claimed in claim 1, wherein the structural supports comprise linear strips, trellis strips, square dot structures, diamond dot structures, or circular dot structures. ### Claim 3 (depends on 1) The protection structure configured to thermal dissipation and prevent thermal runaway diffusion in the battery system as claimed in claim 1, wherein the heat conduction layer is a casing of the unit cells. ### Claim 4 (depends on 1) The protection structure configured to thermal dissipation and prevent thermal runaway diffusion in the battery system as claimed in claim 1, wherein a thermal conductivity coefficient k of the heat conduction layer is at least 50 W/m·K. ### Claim 5 (depends on 4) The protection structure configured to thermal dissipation and prevent thermal runaway diffusion in the battery system as claimed in claim 4, wherein a material of the heat conduction layer comprises gold, silver, aluminum, an aluminum alloy, copper, a copper alloy, magnesium, a magnesium alloy, a metal oxide, or a composite material having one of the above materials mixed with a plastic material. ### Claim 6 (depends on 4) The protection structure configured to thermal dissipation and prevent thermal runaway diffusion in the battery system as claimed in claim 4, wherein a material of the heat conduction layer comprises a composite material having high heat conduction ceramic powder mixed with a plastic material. ### Claim 7 (depends on 1) The protection structure configured to thermal dissipation and prevent thermal runaway diffusion in the battery system as claimed in claim 1, wherein a thermal conductivity coefficient k of the heat insulation layer is at most 2 W/m·K. ### Claim 8 (depends on 7) The protection structure configured to thermal dissipation and prevent thermal runaway diffusion in the battery system as claimed in claim 7, wherein the heat insulation layer comprises a foaming polymer material. ### Claim 9 (depends on 7) The protection structure configured to thermal dissipation and prevent thermal runaway diffusion in the battery system as claimed in claim 7, wherein the heat insulation layer comprises a low melting point polymer material having a melting point ranging from 40° C. to 80° C., a liquid, or air. ### Claim 10 (depends on 1) The protection structure configured to thermal dissipation and prevent thermal runaway diffusion in the battery system as claimed in claim 1, wherein a total thickness of the composite heat conduction plate ranges from 2.0 cm to 0.05 cm, a thickness of the heat conduction layer occupies 3% to 70% of the total thickness, and a thickness of the heat insulation layer occupies 30% to 97% of the total thickness. ### Claim 11 (depends on 1) The protection structure configured to thermal dissipation and prevent thermal runaway diffusion in the battery system as claimed in claim 1, wherein a total thickness of the composite heat conduction plate ranges from 1.0 cm to 0.05 cm, a thickness of the heat conduction layer occupies 5% to 70% of the total thickness, and a thickness of the heat insulation layer occupies 30% to 95% of the total thickness. ### Claim 12 (depends on 1) The protection structure configured to thermal dissipation and prevent thermal runaway diffusion in the battery system as claimed in claim 1, wherein a total thickness of the composite heat conduction plate ranges from 0.5 cm to 0.05 cm, a thickness of the heat conduction layer occupies 10% to 70% of the total thickness, and a thickness of the heat insulation layer occupies 30% to 90% of the total thickness. ### Claim 13 (depends on 1) The protection structure configured to thermal dissipation and prevent thermal runaway diffusion in the battery system as claimed in claim 1, wherein the battery module casing comprises a heat dissipation fin. ### Claim 14 (depends on 13) The protection structure configured to thermal dissipation and prevent thermal runaway diffusion in the battery system as claimed in claim 13, wherein the composite heat conduction plate and the heat dissipation fin are connected to each other through a physical or a soldering bonding method. ### Claim 15 (depends on 1) The protection structure configured to thermal dissipation and prevent thermal runaway diffusion in the battery system as claimed in claim 1, further comprising: a control circuit board disposed within the battery module casing; and the composite heat conduction plate being disposed between the control circuit board and the unit cells. ### Claim 16 (depends on 1) The protection structure configured to thermal dissipation and prevent thermal runaway diffusion in the battery system as claimed in claim 1, further comprising: a circuit disposed within the battery module casing; and the composite heat conduction plate being disposed between the circuit and the unit cells. ### Claim 17 A protection structure configured to thermal dissipation and prevent thermal runaway diffusion in a battery system, the protection structure comprising: a battery pack casing disposed with a plurality of battery modules; and at least one composite heat conduction plate, located within the battery pack casing, contacted with the battery pack casing, and sandwiched between at least two of the battery modules, wherein the composite heat conduction plate is a multilayer anisotropic heat conduction structure, and the composite heat conduction plate comprises: two layers of the heat conduction layer; a plurality of structural supports disposed between the heat conduction layers to support the heat conduction layers and form a plurality of internal spaces; and a heat insulation material filled in the internal spaces as the heat insulation layer. ### Claim 18 (depends on 17) The protection structure configured to thermal dissipation and prevent thermal runaway diffusion in the battery system as claimed in claim 17, wherein the structural supports comprise linear strips, trellis strips, square dot structures, diamond dot structures, or circular dot structures. ### Claim 19 (depends on 17) The protection structure configured to thermal dissipation and prevent thermal runaway diffusion in the battery system as claimed in claim 17, wherein the heat conduction layer is a casing of the battery modules. ### Claim 20 (depends on 17) The protection structure configured to thermal dissipation and prevent thermal runaway diffusion in the battery system as claimed in claim 17, wherein a thermal conductivity coefficient k of the heat conduction layer is at least 50 W/m·K. ### Claim 21 (depends on 20) The protection structure configured to thermal dissipation and prevent thermal runaway diffusion in the battery system as claimed in claim 20, wherein a material of the heat conduction layer comprises gold, silver, aluminum, an aluminum alloy, copper, a copper alloy, magnesium, a magnesium alloy, a metal oxide, or a composite material having one of the above materials mixed with a plastic material. ### Claim 22 (depends on 20) The protection structure configured to thermal dissipation and prevent thermal runaway diffusion in the battery system as claimed in claim 20, wherein a material of the heat conduction layer comprises a composite material having high heat conduction ceramic powder mixed with a plastic material. ### Claim 23 (depends on 17) The protection structure configured to thermal dissipation and prevent thermal runaway diffusion in the battery system as claimed in claim 17, wherein a thermal conductivity coefficient k of the heat insulation layer is at most 2 W/m·K. ### Claim 24 (depends on 23) The protection structure configured to thermal dissipation and prevent thermal runaway diffusion in the battery system as claimed in claim 23, wherein the heat insulation layer comprises a foaming polymer material. ### Claim 25 (depends on 23) The protection structure configured to thermal dissipation and prevent thermal runaway diffusion in the battery system as claimed in claim 23, wherein the heat insulation layer comprises a low melting point polymer material having a melting point ranging from 40° C. to 80° C., a liquid, or air. ### Claim 26 (depends on 17) The protection structure configured to thermal dissipation and prevent thermal runaway diffusion in the battery system as claimed in claim 17, wherein a total thickness of the composite heat conduction plate ranges from 2.0 cm to 0.05 cm, a thickness of the heat conduction layer occupies 3% to 70% of the total thickness, and a thickness of the heat insulation layer occupies 30% to 97% of the total thickness. ### Claim 27 (depends on 17) The protection structure configured to thermal dissipation and prevent thermal runaway diffusion in the battery system as claimed in claim 17, wherein a total thickness of the composite heat conduction plate ranges from 1.0 cm to 0.05 cm, a thickness of the heat conduction layer occupies 5% to 70% of the total thickness, and a thickness of the heat insulation layer occupies 30% to 95% of the total thickness. ### Claim 28 (depends on 17) The protection structure configured to thermal dissipation and prevent thermal runaway diffusion in the battery system as claimed in claim 17, wherein a total thickness of the composite heat conduction plate ranges from 0.5 cm to 0.05 cm, a thickness of the heat conduction layer occupies 10% to 70% of the total thickness, and a thickness of the heat insulation layer occupies 30% to 90% of the total thickness. ### Claim 29 (depends on 17) The protection structure configured to thermal dissipation and prevent thermal runaway diffusion in the battery system as claimed in claim 17, wherein the battery pack casing comprises a heat dissipation fin. ### Claim 30 (depends on 29) The protection structure configured to thermal dissipation and prevent thermal runaway diffusion in the battery system as claimed in claim 29, wherein the composite heat conduction plate and the heat dissipation fin are connected to each other through a physical or a soldering bonding method. ### Claim 31 (depends on 17) The protection structure configured to thermal dissipation and prevent thermal runaway diffusion in the battery system as claimed in claim 17, further comprising: a control circuit board disposed within the battery pack casing; and the composite heat conduction plate being disposed between the control circuit board and the battery modules. ### Claim 32 (depends on 17) The protection structure configured to thermal dissipation and prevent thermal runaway diffusion in the battery system as claimed in claim 17, further comprising: a circuit disposed within the battery pack casing; and the composite heat conduction plate being disposed between the circuit and the battery modules.