Electrochemical device
AssigneeTDK Corporation
InventorsTetsuya Takahashi, Toshinobu Miyakoshi, Tsuyoshi Iijima, Kazuya Ogawa, Satoshi Maruyama
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Abstract
An electrochemical device includes an envelope having a sealable opening and a resin layer on its inner side and an electrochemical element having terminals, wherein the electrochemical element is inserted in the envelope through the opening and sealed therein. A strip of a material different from the resin layer is disposed in the envelope opening and sealed together by thermal fusion so that the strip serves as a pressure relief valve for relieving pressure within the envelope.
Claims23
An electrochemical device comprising
- an envelope having a sealable opening,
- an electrochemical element having terminals, said electrochemical element being inserted in said envelope through the opening which is sealed to form a seal,
- said envelope having a resin layer on its inner side adjacent said electrochemical element, and
- a strip of a material different from the resin layer of said envelope, disposed in at least a portion of the seal, said strip serving as a means for relieving pressure within said envelope.
An electrochemical device comprising
- an envelope,
- an electrochemical element received and sealed in the envelope, and
- a heat-sensitive protective component for protecting the electrochemical element, said heat-sensitive protective component being attached to said envelope substantially outside said electrochemical element.
An electrochemical device comprising
- a flexible envelope,
- an electrochemical element received and sealed in said envelope, said electrochemical element including internal electrodes and external electrodes electrically connected to the internal electrodes and extending outside said envelope, and
- current shut-off means for shutting off either of the electrical connections between the internal electrodes and the external electrodes by detecting the stress created by inflation of said envelope.
The electrochemical device of 16 wherein the internal electrode is attached to the envelope at a tensile strength A, the external electrode is attached to the envelope at a tensile strength B, and the internal electrode is connected to the external electrode at a tensile strength C such that C is lower than A, and C is lower than B.
The electrochemical device of which comprises a lithium secondary battery.
Dependencies are inferred from the claim text.