TWI440242B - Lithium battery - Google Patents

Description

lithium battery

The present invention relates to a battery, and more particularly to a lithium battery.

As mobile devices continue to grow and the demand for mobile devices continues to increase, the demand for batteries as a source of energy for mobile devices has increased dramatically, with lithium batteries among them. Lithium batteries are favored because of their high energy ratio, long service life, high rated voltage, high power endurance, low self-discharge rate, light weight and high temperature adaptability.

Although the existing lithium battery has a safety valve design, such as the Chinese Patent No. CN2805102 discloses a lithium battery with a safety valve, the solution disclosed in the patent is to draw a 45 degree groove on one side of the battery case as a safety. Valve, but the safety valve described in this scheme is not easy to open in practical applications, and it does not achieve the explosion-proof effect.

In view of this, it is necessary to further improve the existing lithium battery to solve the above problems.

The object of the present invention is to provide a lithium battery having a safety valve which is simple in processing, low in cost, high in sensitivity, and timely in pressure relief.

In order to achieve the above object, the present invention relates to a lithium battery, comprising: a battery core assembly, the battery core assembly being composed of a material such as a positive electrode, a negative electrode, a separator, and the like; and a battery case having a bottom surface and extending upwardly perpendicular to the bottom surface The battery case has a receiving space and a sealing port surrounded by the bottom surface and the plurality of side surfaces, wherein the battery cell assembly is housed in the receiving space, and an electrolyte solution is filled in the battery cell assembly and Between the battery cases; a safety valve, the safety valve is a groove disposed on one side of the battery case; a battery core cover, the battery core cover sealing the battery core assembly and the electrolyte into the battery case Wherein the length of the trench is between one third and one half of the width of the side surface of the trench.

As a further improvement of the present invention, the width of the aforementioned groove is between 3 mm and 5 mm.

As a further improvement of the present invention, the aforementioned safety valve has a residual thickness of between 0.1 mm and 0.15 mm.

As a further improvement of the present invention, the aforementioned safety valve is a linear groove.

As a further improvement of the present invention, the aforementioned safety valve extends in a direction parallel to the aforementioned battery core cover.

As a further improvement of the present invention, the aforementioned safety valve is an S-shaped groove.

As a further improvement of the present invention, the aforementioned safety valve is a wave-shaped groove.

The invention has the beneficial effects that the safety valve has the advantages of simple processing, low cost, high sensitivity, timely pressure relief, etc., and enhances the safety of the lithium battery.

Referring to the first and second figures, the lithium battery 100 of the present invention comprises: a battery case 10, a battery cell assembly 20 housed in the battery case 10, a battery output end 30, a battery cell cover 40, and an electrolyte solution. .

Referring to the third (a) and third (b), the battery case 10 has a bottom surface 11 , a sealing opening 16 , and a first side surface 12 , a second side surface 13 extending perpendicularly to the bottom surface 11 . The three side faces 14 and the fourth side face 15 are parallel to the second side face 13 , and the third side face 14 is parallel to the fourth side face 15 , and the first side face 12 is perpendicular to the third side face 14 . The bottom surface 11 and the first side surface 12, the second side surface 13, the third side surface 14, and the fourth side surface 15 are surrounded by a receiving space (not labeled). The first side surface 12 is provided with a safety valve 121. The safety valve 121 is a groove and is open at a position where the first side surface 12 and the fourth side surface 15 intersect. The second side surface 13 is also provided with a safety valve 131. The safety valve 131 is also a groove and is open at the intersection of the second side surface 13 and the third side surface 14. The distance between the safety valves 121, 131 and the sealing port 16 is less than a quarter of the distance between the sealing port 16 and the bottom surface 11. In the present embodiment, although the battery case 10 is provided with only two safety valves, in other embodiments, the battery case 10 may be provided with one or more safety valves as long as the distance between the aforementioned safety valve and the bottom surface 11 is Or the distance between the safety valve and the sealing port 16 may be less than a quarter of the distance between the bottom surface 11 and the sealing port 16. The safety valve is selected in the above position because the groove in the position is subjected to the maximum strain force when the battery expands, so that the safety valve can be easily opened to achieve the purpose of pressure relief, thereby enhancing battery safety. Sex. In the present embodiment, although the safety valve is opened on both sides, in other embodiments, the safety valve may be opened only on one side.

Referring to the third (a) and third (b), the length of the safety valve 121 is between one third and one half of the width of the first side 12, and the width of the safety valve 121 is Between 3 mm and 5 mm. Similarly, the length of the safety valve 131 is between one third and one half of the width of the second side surface 13, and the width of the safety valve 131 is between 3 mm and 5 mm. The residual thickness of the aforementioned safety valve 121 and safety valve 131 is between 0.1 mm and 0.15 mm.

Referring to the fourth (a) diagram, the safety valve 121 has a U-shaped cross section. At the bottom of the section of the safety valve 121, there are two concave corners 122, and the angle of the concave angle 122 is a right angle. In the present embodiment, although the concave corner 122 is a right angle, in other embodiments, the concave corner 122 may be an acute angle or an obtuse angle. For example, the concave corner 123 shown in the fourth (b) diagram is an obtuse angle. In the embodiment, the safety valve 121 is a linear groove. However, in other embodiments, the safety valve 121 may also be a groove of a different shape such as a wave groove or an S-shaped groove. Referring to the first figure, the safety valve 121 is provided with a chamfer 124, and the chamfer 124 has a circular arc shape. In the present embodiment, although the chamfer 124 has a circular arc shape, in other embodiments, the chamfer 124 may be a 45 degree chamfer, a 30 degree chamfer or the like.

Referring to the second figure, the battery cell assembly 20 includes a positive electrode sheet 21, a negative electrode sheet 22, and a separator 23. The positive electrode sheet 21 and the negative electrode sheet 22 are stacked one on another, and the separator 23 is interposed between the positive electrode sheet 21 and the negative electrode sheet 22 to separate the positive electrode sheet 21 from the negative electrode sheet 22. The battery cell unit 20 is housed in a housing space of the battery case 10 .

Referring to the second figure, the aforementioned battery output terminal 30 includes a positive output terminal 31 and a negative output terminal 32. The positive output terminal 31 and the aforementioned negative output 32 are both composed of a screw and a nut. The positive electrode output end 31 is connected to the positive electrode sheet 21; the negative electrode output end 32 is connected to the negative electrode sheet 22.

The battery cell cover 40 is provided with two electrode holes 41 for accommodating the positive output terminal 31 and the negative output terminal 32. The battery cell cover 40 seals the battery cell assembly 20 and the electrolyte solution to the housing space on the battery case 10.

In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above-mentioned embodiments are merely preferred embodiments of the present invention, and the scope of the present invention is not limited to the above-described embodiments, and those skilled in the art will be able to make equivalent modifications or variations in accordance with the spirit of the present invention. It should be covered by the following patent application.

100. . . lithium battery

10. . . Battery housing

11. . . Bottom

12. . . First side

121. . . Safety valve

122. . . Concave angle

123. . . Concave angle

124. . . Chamfer

13. . . Second side

131. . . Safety valve

14. . . Third side

15. . . Fourth side

16. . . Sealing port

20. . . Battery core assembly

twenty one. . . Positive electrode

twenty two. . . Negative electrode sheet

twenty three. . . Isolation film

30. . . Battery output

31. . . Positive output

32. . . Negative output

40. . . Battery cover

41. . . Electrode hole

The first figure is a perspective view of a lithium battery of the present invention.

The second figure is a perspective view of the battery cell assembly of the lithium battery shown in the first figure.

The third (a) is a front view of the battery case of the lithium battery shown in the first figure.

The third (b) is a perspective view of the battery case of the lithium battery shown in the first figure.

The fourth (a) is a schematic cross-sectional view of the safety valve of the lithium battery shown in the first figure.

The fourth (b) is a schematic cross-sectional view of a safety valve in another embodiment of the lithium battery of the present invention.

100. . . lithium battery

10. . . Battery housing

124. . . Chamfer

30. . . Battery output

40. . . Battery cover

Claims (7)

A lithium battery includes: a battery core assembly, the battery core assembly is composed of a material such as a positive electrode, a negative electrode, a separator, and the like; and a battery case having a bottom surface and a plurality of sides extending upwardly perpendicular to the bottom surface, the battery case The accommodating space and the sealing port which are formed by the bottom surface and the plurality of side surfaces, wherein the battery cell assembly is housed in the accommodating space, and the electrolyte solution is filled between the battery cell assembly and the battery case; a valve, the safety valve is a groove disposed on one side of the battery case; a battery core cover, the battery core cover sealing the battery core assembly and the electrolyte solution in the battery case; wherein the length of the groove is The groove is between one third and one half of the width of the side. The lithium battery of claim 1, wherein the width of the aforementioned groove is between 3 mm and 5 mm. The lithium battery of claim 2, wherein the residual thickness of the aforementioned safety valve is between 0.1 mm and 0.15 mm. The lithium battery of claim 1, wherein the safety valve is a linear groove. The lithium battery of claim 4, wherein the safety valve extends in a direction parallel to the battery core cover. The lithium battery of claim 1, wherein the safety valve is an S-shaped groove. The lithium battery of claim 1, wherein the safety valve is a wave groove.