Pouch type lithium rechargeable battery
AssigneeSamsung SDI Co., Ltd.
InventorsJoongheon Kim, Hyungbok Lee
Life of this patent
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Abstract
A pouch type lithium secondary battery includes an electrode assembly includes a positive electrode plate and a negative electrode plate, wherein disposed facing against each other, and a separator interposed between the positive electrode plate and the negative electrode plate, and a case includes a lower plate wherein a second chamber containing the electrode assembly, and an upper plate seals the second chamber, wherein the upper plate includes a sealing trace formed at the area corresponded to the area where the second chamber sealed.
Claims16
A pouch type lithium secondary battery having an electrode assembly that includes a positive electrode plate and a negative electrode plate facing against each other, and a separator interposed between the positive electrode plate and the negative electrode plate, the pouch type lithium secondary battery comprising:
- a case that includes an upper plate and a lower plate;
- wherein the lower plate includes a first chamber containing the electrode assembly;
- wherein the case is formed by folding a multilayer film pouch so as to form a common portion formed by contacting the first chamber and a second chamber with each other, the second chamber is formed at one upper side of the multilayer film pouch and the first chamber is formed in a diagonal direction to the second chamber at one lower side of the multilayer film pouch, the multilayer-film pouch being folded to form the common portion where the first chamber and the second chamber overlap each other;
- wherein the upper plate seals the first chamber formed at the lower plate, and includes a sealing trace formed at the area where the first chamber is sealed;
- and
- wherein the sealing trace is formed in a shape where unshaped creases are distributed.
A manufacturing method of a pouch-type lithium secondary battery, the method comprising:
- forming a first chamber at one side of a multilayer film pouch and a second chamber at the other side of the multilayer film pouch in a diagonal direction to the first chamber and folding the multilayer film pouch such that an upper plate is formed on which the first chamber is disposed and a lower plate is formed on which the second chamber is disposed so as to form a common portion by overlapping a portion of the first chamber and a portion of the second chamber;
- sealing the lower plate having said second chamber, said second chamber containing an electrode assembly, to the upper plate while forming an opened gangway connecting the first chamber to the outside, said sealing being formed by heating and pressuring the area where the first chamber, the second chamber and gangway are excluded;
- injecting an electrolyte to the first chamber via the opened gangway;
- charging and discharging the electrode assembly;
- and
- sealing the area where the first chamber is formed near the second chamber, and removing the area that includes the first chamber area which has not been sealed.
Dependencies are inferred from the claim text.