Field of the Invention
The present invention generally relates to a lithium battery and, in particular to structures and manufacturing processes of a lithium battery cell.
Description of Prior Art
Lithium ion batteries have become a preferred battery for portable electronic products. A lithium battery usually makes use of chemical reactions of electrodes and electrolyte to generate electricity. However, when the battery cell does not work properly (for example, overcharging), the electrolyte and other materials will pyrolysis and produce combustible gas (i.e. hydrogen) during reacting processes. The gas maybe cause a pressure rising inside the cell and that will lead to a deformation of the shell, even an explosion will be occurred.
Therefore, the subject matter of the present invention is that how to design structures of battery cells for improving the safety of the battery cells and discharge combustible gas in the batteries timely in order to avoid explosion of the combustible gas accumulated in the battery cells.
In view of the above drawbacks, the Inventor proposes the present invention based on his expert knowledge and elaborate researches in order to solve the problems of prior art.
Accordingly, an object of the present invention is to provide structures of a lithium battery cell and manufacturing processes thereof, wherein buildup gas can be discharged timely and not to be accumulated inside the batter cell, thus the internal pressure of the lithium battery cell will be maintained, and an explosion can be avoided.
In order to achieve the object mentioned above, the present invention provides structures of a lithium battery cell comprising a flexible pouch and two conductive tabs. The flexible pouch has an accommodating space and a being sealed side located at a periphery of the accommodating space. The two conductive tabs are inserted in the being sealed side and extended to the accommodating space. The being sealed side includes a first sealing area and a second sealing area, the first sealing area and the second sealing area are sealed to form a side seal through a combination means. The first sealing area has a first binding force, and the second sealing area having a second binding force, wherein the second binding force is smaller than the first binding force, and gas buildup in the accommodating space was discharged from the second sealing area.
In order to achieve the object mentioned above, the present invention provides manufacturing processes of a lithium battery cell, comprising: a) providing a flexible pouch and two conductive tabs; b) folding the flexible pouch to form a bag body with a being sealed side, the being sealed side of the bag body includes a first sealing area and a second sealing area; c) inserting the two conductive tabs in the being sealed side; and d)sealing the being sealed side with a combination means, and making a binding force of the seconding area smaller than that of the first sealing area.
Comparing with the prior art, the side seal of the structures of a lithium battery cell of the present invention includes a first sealing area and a second sealing area; the first sealing area and the second sealing area are sealed through a combination means that a binding force of the second sealing area is smaller than that of the first sealing area. Thus gas buildup was discharged from the second sealing area, and the internal pressure of the lithium battery cell will not be exceeded to cause an explosion, and operations of the other lithium battery cells will be performed normally.
The features of the invention believed to be novel are set forth with particularity in the appended claims. The invention itself, however, may be best understood by reference to the following detailed description of the invention, which describes a number of exemplary embodiments of the invention, taken in conjunction with the accompanying drawings, in which:
In cooperation with attached drawings, the technical contents and detailed description of the invention are described thereinafter according to a number of preferable embodiments, being not used to limit its executing scope. Any equivalent variation and modification made according to appended claims is all covered by the claims claimed by the present invention.
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Moreover, the two conductive tabs 20 are inserted in the being sealed side 11′ and extended to the accommodating space 100. The being sealed side 11′ includes a first sealing area 111 and a second sealing area 112; besides, the first sealing area 111 and the second sealing area 112 are sealed to form a side seal 11 through a combination means. In further, the first sealing area 111 has a first binding force, and the second sealing area 112 has a second binding force, wherein the second binding force is smaller than the first binding force.
More specifically, the flexible pouch 10 is folded and has a fold-edge 12 located at a side of the accommodating space 100. The side seal 11 includes two side-sealing edges 11a located at the right and left sides of the fold-edge 12 and an upper-sealing edge 11b located at the opposite side of the fold-edge 12, and the two conductive tabs 20 are inserted in the first sealing area 111 of the upper-sealing edge 11b. In addition, the side seal 11 includes an inner-sealing edge 11c neighboring the accommodating space 100 and an outer-sealing edge 11d in parallel with the inner-sealing edge 11c; preferably, the second sealing area 112 is extended from the inner-sealing edge 11c to the outer-sealing edge lid. Whereas the electrolyte filled in the lithium battery cell 1 and manufacturing processes thereof are well known in the art and will not be described further.
It is worth of noticing that the combination means can be implemented by combining processes such as hot melt, ultrasonic-welding or adhesion etc. In real practice, the first sealing area 111 and the second sealing area 112 have different combination forces through different combination means.
For example, when the combination means is provided with adhesion, the lithium battery cell 1 further includes a first adhesive and a second adhesive (not shown). The first sealing area 111 is sealed through the first adhesive, and the second sealing area 112 is sealed through the second adhesive, wherein the adhesive force of the second adhesive is smaller than that of first adhesive. Therefore, the second binding force of the second sealing area 112 is smaller than the first binding force of the first sealing area 111.
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In the present embodiment, the additive 13 is disposed at the second sealing area 112. In addition, the first sealing area 111 and the second sealing area 112 are provided with the same combination means; the binding force of the second sealing area 112 is smaller than that of the first sealing area 111 by providing the additive 13.
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In summary, the supporting spacer of the present invention can achieve the expected objective and overcome the disadvantages of the prior art. Also it is indeed novel, useful, and non-obvious to be patentable. Please examine the application carefully and grant it as a formal patent for protecting the rights of the inventor.
Number | Date | Country | Kind |
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105105972 | Feb 2016 | TW | national |