# US 10,319,968 B2 · Battery pack > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,319,968 B2 - Document ID: US10319968B2 - Status: Granted - Kind: B2 - Application number: 15/106,646 - Filed: 2014-12-11 - Published: 2017-02-02 - Granted: 2019-06-11 - Earliest claimed: 2013-12-26 - Assignees: Kabushiki Kaisha Toyota Jidoshokki - Applicants: Kabushiki Kaisha Toyota Jidoshokki - Inventors: Yuki Chujo; Takayuki Kato; Hiromi Ueda; Fumihiko Ishiguro - Web page: https://patentgrep.com/patent/US10319968B2 ## CPC - H01M 50/325: comprising deformable valve members, e.g. elastic or flexible valve members - H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries - H01M 10/345: {Gastight metal hydride accumulators} - H01M 50/204: Racks, modules or packs for multiple batteries or multiple cells - H01M 50/262: with fastening means, e.g. locks - H01M 50/271: Lids or covers for the racks or secondary casings - H01M 50/317: Re-sealable arrangements - H01M 50/3425: {in the form of rupturable membranes or weakened parts, e.g. pierced with the aid of a sharp member} - H01M 2200/20: Pressure-sensitive devices - 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 battery pack has a sealed case. Battery modules are housed in the sealed case. Each battery module contains multiple battery cells. The sealed case has a main body having an opening. The opening in the main body is closed by a rectangular plate-shaped lid member. The lid member has a first releasing portion and a second releasing portion, which are opened when the internal pressure of the sealed case increases. The second releasing portion is arranged below the first releasing portion in the vertical direction. ## Claims ### Claim 1 A battery pack comprising: a plurality of battery cells, each of which includes a case having a pressure relief valve and an electrode assembly accommodated in the case; a sealed case, which accommodates the battery cells; and releasing portions, which are provided in the sealed case and release an internal pressure of the sealed case, wherein each of the releasing portions is formed by a lid member, wherein the lid member forms a side wall of the sealed case, and wherein the lid member is attached to an opening edge of the sealed case by a joint portion, wherein the releasing portions include a first releasing portion and a second releasing portion, which is located below the first releasing portion in a vertical direction, wherein the first releasing portion and the second releasing portion are provided at respective ends of the lid member in the vertical direction, and wherein when the first releasing portion and the second releasing portion are opened the first releasing portion and the second releasing portion are not in contact with the opening edge. ### Claim 2 (depends on 1) The battery pack according to claim 1, wherein the first releasing portion and the second releasing portion are provided in a same side wall that constitutes the sealed case. ### Claim 3 (depends on 2) The battery pack according to claim 2, wherein the lid member has a size required for closing the entire opening of the sealed case, wherein the first releasing portion is provided at an upper end of the lid member in the vertical direction, and wherein the second releasing portion is provided at a lower end of the lid member in the vertical direction. ### Claim 4 (depends on 1) The battery pack according to claim 1, wherein the first releasing portion and the second releasing portion are deformable to form a clearance between the lid member and the opening edge, and wherein, after deformation, in an elastic region of the lid member, the first and second releasing portions recover the original shapes of the first and second releasing portions, respectively. ### Claim 5 (depends on 1) The battery pack according to claim 1, wherein the lid member has a first end and a second end, wherein the first end and the second end extend in the vertical direction, and wherein a plurality of bolts are arranged along each of the first end and the second end. ### Claim 6 (depends on 5) The battery pack according to claim 5, wherein an uppermost bolt on the first end and an uppermost bolt on the second end define a first imaginary line connected between the uppermost bolt on the first end and the uppermost bolt on the second end, wherein a lowermost bolt on the first end and a lowermost bolt on the second end define a second imaginary line connected between the lowermost bolt on the first end and the lowermost bolt on the second end, and wherein an area of the lid member between the first imaginary line and the second imaginary line is the joint portion. ### Claim 7 (depends on 1) The battery pack according to claim 1, wherein the lid member is rectangular. ### Claim 8 (depends on 7) The battery pack according to claim 7, further comprising a plurality of bolts on opposite sides of the lid member. ### Claim 9 (depends on 8) The battery pack according to claim 8, wherein the plurality of bolts on opposite sides of the lid member include uppermost bolts and lowermost bolts, and wherein the uppermost bolts and the lowermost bolts define the joint portion of the lid member. ### Claim 10 (depends on 1) The battery pack according to claim 1, wherein the lid member comprises a flexible layer of material, and wherein the first releasing portion, the joint portion, and the second releasing portion are portions of the lid member and together form the lid member. ### Claim 11 (depends on 1) The battery pack according to claim 1, wherein the joint portion is arranged between the first releasing portion and the second releasing portion in the vertical direction. ### Claim 12 (depends on 1) The battery pack according to claim 1, wherein when the first releasing portion and the second releasing portion are opened, a joint between the joint portion and the opening edge is maintained.