TWI437751B - Can automatically add the electrolyte lithium battery core - Google Patents

Description

Lithium battery core that can automatically replenish electrolyte

The invention relates to a lithium battery core, in particular to a lithium battery core capable of automatically replenishing an electrolyte.

A generalized lithium ion secondary battery (hereinafter referred to as a lithium battery) is mainly composed of a positive electrode, a negative electrode, a separator interposed between the positive and negative electrodes, and an electrolytic solution. Among them, the separator separates the positive and negative electrodes from each other and does not contact each other. At the same time, the separator and the positive and negative electrodes have extremely small pores, allowing the electrolyte to circulate between the positive and negative electrodes. The amount of current that a lithium battery can supply is limited by the "capacity" of the lithium battery, and the capacity of the lithium battery is closely related to the availability of the electrolyte.

After the lithium battery is used "on time", the electrolyte will be sucked away by the expansion of the positive and negative electrodes, resulting in insufficient charged lithium ion moving medium (electrolyte) circulating between the two poles, resulting in local exhaustion of the positive electrode (Dry Out) phenomenon. The lithium ion is precipitated into a lithium atom to lower the capacity of the lithium battery. Once the cathode is exhausted to a certain extent, the lithium battery will fail. Therefore, the life of the lithium battery can be extended by means of replenishing the electrolyte. However, since the lithium battery is completely sealed, it cannot be replenished with water from the outside when the liquid level of the electrolyte is too low, like a battery.

The present invention has been made to solve the above problems, and an object thereof is to provide a lithium battery cell capable of automatically replenishing an electrolyte, ensuring that the lithium battery is still close to its original capacity after a period of use, and prolonging the life of the lithium battery.

Specifically, the lithium battery cell of the present invention comprises a package bag, the inner space of the package bag is separated into a core chamber and at least one liquid storage chamber by at least one partition, the core chamber and the liquid storage chamber being disposed on the partition portion. The channels are connected to each other, and a positive electrode, a negative electrode, a separator separating the positive and negative electrodes, and an electrolytic solution are accommodated in the core chamber, and a supplementary electrolyte solution is stored in the liquid storage chamber.

The liquid storage chamber may be formed on one side, two sides or both sides of the core chamber.

The utility model has the advantages that the conventional technology of the present invention can replenish the electrolyte which is sucked away by the expansion of the positive and negative electrodes after the use of the lithium battery "on time", ensuring that the lithium battery is still close to its original capacity after a period of use, and prolonging the lithium battery. Pool life.

The technical contents and other objects and features of the present invention will be fully understood from the following description of the embodiments.

The first figure is the front side of the "lithium battery core capable of automatically replenishing electrolyte" 10a, the second figure is a cross section thereof, and the third figure is the appearance of some components thereof, which can explain the technical content of the present invention, wherein The directions of the down, left, and right are based on the first figure. The lithium battery cell 10a includes a package bag 12, which is formed by heat-sealing three layers of the inner layer 12a, the middle layer 12b and the outer layer 12c. The three layers of material are generally made of polypropylene (PP), aluminum foil, and Nylon, but other suitable materials, are not limited by the above materials. The inner space of the package bag 12 is partitioned into a core chamber 16 and a liquid storage chamber 18 by a partition portion 14, and the partition portion 14 has a passage 20 for communicating the core chamber 16 and the liquid storage chamber 18. In the core chamber 16, a positive electrode 22, a negative electrode 24, a separator 26 separating the positive and negative electrodes, and an electrolytic solution (not shown) are housed. The positive electrode 22 is composed of a plurality of positive electrode plates 22a. The negative electrode 24 is composed of a plurality of negative electrode plates 24a. In the preferred embodiment, the number of negative plates 24a is one more than the number of positive plates 22a to provide sufficient space for lithium ions to reciprocate in the electrolyte during chemical reactions. When the number of the positive electrode plates 22a and the negative electrode plates 24a is the same, it may be difficult to achieve an optimum matching of the lithium battery capacity and reduce the partial capacity. The positive electrode tab 22b of the positive electrode plate 22a and the negative electrode tab 24b of the negative electrode plate 24a are protruded outward from the upper side of the package bag 12, and are electrically connected. The separator 26 and the positive electrode plate 22a and the negative electrode plate 24a have extremely small pores (not shown) which allow the electrolyte to circulate between the positive electrode 22 and the negative electrode 24.

The invention is characterized in that a liquid storage chamber 18 is provided on the right side of the core chamber 16 of the package bag 12. The liquid storage chamber 18 stores a supplementary electrolyte (not shown), and the supplementary electrolyte is permeable. The capillary phenomenon automatically replenishes the electrolyte solution that is sucked away by the expansion of the positive electrode 22 and the negative electrode 24 after the use of the lithium battery "via time" via the passage 20. It is understood that since the positive electrode plate 22a, the negative electrode plate 24a, and the separator 26 are filled with pores (corresponding to a capillary), the supplementary electrolyte can be absorbed into the core chamber 16 by the positive electrode 22, the negative electrode 24, and the separator 26, and the replenishment is insufficient. The electrolyte ensures that the lithium battery is still close to its original capacity after a period of use, achieving the purpose of extending the life of the lithium battery.

A plurality of lithium battery cells 10a are connected in series or in parallel to achieve a desired voltage and capacity, and a battery management system (BMS) and necessary circuits are attached, and then the housing is fixed and protected. Commercially used lithium batteries, including energy storage and driving power supplies for electric vehicles, hybrid electric vehicles, electric motor vehicles, electric bicycles, ships, aircraft, uninterruptible power systems (UPS), electric hand tools, etc. High current) use. In the case of indoor safe area, it can also be open type, that is, it is not fixed and protected by the outer casing to facilitate heat dissipation.

It should be noted that the present invention is not limited to the above embodiments, and may be of other different types. For example, the lithium battery cell 10b as shown in the fourth and fifth figures may be provided with the liquid storage chamber 18 on the bottom side of the core chamber 16, or the lithium battery cell 10c as shown in the sixth figure, so that the liquid storage The chamber 18 is formed on the left side of the core chamber 16.

Further, the liquid storage chamber 18 is not limited to be formed on the bottom side, the left side, or the right side of the core chamber 16, and may be formed on both sides or both sides of the core chamber 16 at the same time. For example, in the lithium battery cell 10d disclosed in the seventh embodiment, the liquid storage chamber 18 is simultaneously formed on the left and right sides of the core chamber 16. In the lithium battery cell 10e disclosed in the eighth embodiment, the liquid storage chamber 18 is simultaneously disposed on the right side and the bottom side of the core chamber 16. The lithium battery cell 10f disclosed in the ninth embodiment has a liquid storage chamber 18 formed simultaneously on the left and bottom sides of the core chamber 16. In the lithium battery cell 10g disclosed in the tenth embodiment, the liquid storage chamber 18 is simultaneously disposed on the left side, the right side, and the bottom side of the core chamber 16.

Since the positive electrode tab 22b and the negative electrode tab 24b protrude from the upper side of the package bag 12, the liquid storage chamber 18 is not preferably provided on the upper side of the core chamber 16.

The lithium battery cells 10b to 10g disclosed in the second to seventh embodiments are different from the lithium battery cells 10a disclosed in the first embodiment only in the position of the liquid storage chamber 18 with respect to the core chamber 16, and the remaining portions are identical. The same portions as those of the first embodiment are denoted by the same reference numerals, and the descriptions of the first embodiment are also applicable to the embodiments, and are not repeated.

Of course, the above embodiments may be modified without departing from the scope of the invention, and all the matters included in the above description and the drawings are to be considered as illustrative and not limiting the scope of the invention. .

10a~10g. . . Lithium battery

12. . . Packaging bag

12a. . . Inner layer

12b. . . Middle layer

12c. . . Outer layer

14. . . Separator

16. . . Core chamber

18. . . Liquid storage chamber

20. . . aisle

twenty two. . . positive electrode

22a. . . Positive plate

22b. . . Positive pole

twenty four. . . negative electrode

24a. . . Negative plate

24b. . . Negative pole

26. . . Isolation film

The first figure is a front view of the first embodiment of the present invention.

The second figure is an enlarged cross-sectional view taken along line 2-2 of the first figure.

The third figure is a partial view of the components of the first figure.

The fourth figure is a front view of a second embodiment of the present invention.

The fifth figure is an enlarged cross-sectional view taken along line 5-5 of the fourth figure.

Figure 6 is a front elevational view of a third embodiment of the present invention.

Figure 7 is a front elevational view of a fourth embodiment of the present invention.

Figure 8 is a front elevational view of a fifth embodiment of the present invention.

Figure 9 is a front elevational view of a sixth embodiment of the present invention.

Figure 11 is a front elevational view of a seventh embodiment of the present invention.

10a. . . Lithium battery

12. . . Packaging bag

12a. . . Inner layer

12b. . . Middle layer

12C. . . Outer layer

14. . . Separator

16. . . Core chamber

18. . . Liquid storage chamber

20. . . aisle

twenty two. . . positive electrode

22a. . . Positive plate

twenty four. . . negative electrode

24a. . . Negative plate

26. . . Isolation film

Claims (2)

A lithium battery core capable of automatically replenishing an electrolyte, comprising a package bag, the inner space of the package bag being separated by at least one partition into a core chamber and at least one liquid storage chamber, wherein the core chamber and the liquid storage chamber are disposed at the partition The channels in the upper portion are connected to each other, and a positive electrode, a negative electrode, a separator separating the positive and negative electrodes, and an electrolytic solution are accommodated in the core chamber, and a supplementary electrolyte solution is stored in the liquid storage chamber. The lithium battery cell according to claim 1, wherein the liquid storage chamber is formed on one side, two sides or both sides of the core chamber.