Soft package battery

Abstract

The utility model discloses a soft package battery. The soft package battery comprises a soft package shell, the roll core is arranged in the soft package shell, tabs are arranged at two end parts of the roll core in a protruding manner, and the tabs extend to the outside of the soft package shell; and the gas bag is used for collecting gas generated when the battery is charged and discharged for the first time, and the gas bag is arranged on the same side of the tab. Soft package packaging is adopted, the packaging process can be completed by means of hot-pressing edge sealing equipment, the packaging technology is simple, the safety is good, meanwhile, the air bag extends on the side of the electrode lug, so that the side wall of the roll core is well attached to a soft package shell, stress is even in the charging and discharging process of the battery, and stable exertion of the electrical performance of the battery is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a soft-pack battery. Background Art

[0002] Most of the cylindrical batteries manufactured by current battery manufacturers are encapsulated in steel shells. Although steel shell batteries have good pressure resistance and mechanical protection due to their metal shells, and can effectively protect the internal cells of the battery from external physical damage, they still have the following shortcomings:

[0003] 1. Thermal runaway of steel shell battery cells may cause explosion accidents;

[0004] 2. The steel shell has high density and high quality, which reduces the overall energy density of the battery;

[0005] 3. The steel shell packaging process is relatively complicated.

[0006] In order to solve the disadvantages of the above-mentioned steel shell packaging, soft-pack packaging can be selected. However, the air bag extending from the side of the cylindrical battery in the soft-pack packaging will cause uneven force on the side wall of the roll core during the charging and discharging process. In this case, lithium deposition and electrical performance degradation may occur at the least, and the electrode may deteriorate and cause a safety accident at the worst. Utility Model Content

[0007] The technical problem to be solved by the utility model is how to design a cylindrical soft-pack battery.

[0008] In order to solve the above technical problems, the utility model provides a soft pack battery, comprising:

[0009] Soft case shell;

[0010] A winding core is built into the soft-package shell, and pole ears are protruding from both ends of the winding core, and the pole ears extend to the outside of the soft-package shell; and

[0011] An air bag is used to collect the gas generated when the battery is charged and discharged for the first time, and the air bag is arranged on the same side of the pole ear.

[0012] Furthermore, the winding core has a cylindrical structure.

[0013] Furthermore, the soft package shell forms a hot-pressed edge sealing structure on the pole ear side.

[0014] Furthermore, the soft package shell wraps the roll core so that the side wall of the roll core fits with the inner wall of the soft package shell.

[0015] Furthermore, the inner diameter of the soft package shell is 1.01-1.2 times the diameter of the winding core.

[0016] Furthermore, the length of the soft package shell is 1.3-2 times the height of the roll core.

[0017] Furthermore, the thickness of the soft package shell is 0.1-1 mm.

[0018] Furthermore, the soft package shell is an aluminum-plastic composite film or a polyimide film.

[0019] Furthermore, the volume of the air bag is 1 / 3-2 / 3 times the volume of the roll core.

[0020] Compared with the prior art, the utility model has the following beneficial effects:

[0021] The utility model adopts soft-pack packaging for cylindrical batteries, and the packaging process can be completed with the help of hot pressing edge sealing equipment. The packaging process is simple and safe. At the same time, an air bag is extended on the ear side, so that the side wall of the roll core fits well with the soft-pack shell. During the battery charging and discharging process, the force is evenly applied, which is conducive to the stable performance of the battery electrical performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of a finished soft-pack battery package disclosed in an embodiment of the utility model;

[0023] Figure 2 A top view of the soft package shell during the packaging process disclosed in the embodiment of the utility model;

[0024] Figure 3 It is a side view of the soft package shell during the packaging process disclosed in the embodiment of the utility model.

[0025] In the figure: 10, soft package shell; 20, winding core; 21, pole ear; 30, air bag. DETAILED DESCRIPTION

[0026] In order to make the technical scheme and technical effect of the utility model clearer, the technical scheme in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments.

[0027] The utility model provides a soft pack battery to overcome the disadvantages of cylindrical soft pack batteries. Figure 1 , mainly comprising a soft package shell 10, a roll core 20 and an air bag 30. The roll core 20 targeted by the utility model is a cylindrical structure.

[0028] The soft-pack shell 10 wraps the roll core 20 so that the side wall of the roll core 20 fits well with the inner wall of the soft-pack shell 10. Since the battery expands and contracts during the charge and discharge process, the inner diameter of the soft-pack shell 10 in this embodiment is designed to be 1.01-1.2 times the diameter of the roll core 20. Taking into account the length of the external pole ear 21 and the air bag 30, the length of the soft-pack shell 10 is designed to be 1.3-2 times the height of the roll core 20. Since the thickness of the soft-pack shell 10 is too thick, the overall energy density will be reduced, and the thickness of the soft-pack shell 10 is too thin, which may be unstable and cause safety hazards, so the thickness of the soft-pack shell 10 is designed to be 0.1-1mm. Preferably, the soft-pack shell 10 is an aluminum-plastic composite film or a polyimide film.

[0029] The winding core 20 is built into the soft-package shell 10 , and pole tabs 21 , namely, a positive pole tab and a negative pole tab, are protruding from both ends of the winding core 20 ; the pole tabs 21 extend to the outside of the soft-package shell 10 .

[0030] The air bag 30 is arranged on the same side of the pole ear 21 to collect the gas generated when the battery is charged and discharged for the first time. Preferably, the volume of the air bag 30 is 1 / 3-2 / 3 times the volume of the winding core 20.

[0031] The soft package packaging of the present invention is similar to the sleeve form, that is, the side of the core 20 does not need to be heat-sealed, and the soft package shell 10 forms a heat-pressed edge sealing structure on the side of the tab 21. This design can avoid the core 20 from forming an uneven force surface. Figure 2 During the packaging process of the soft package shell 10, the section A is folded toward the section B so that the two sides overlap to form the outlet of the tab 21 of the cylindrical winding core 20. Figure 3 , the cross-sectional distance from section a to section B is 2-6 cm, which is equal to the distance from section b to side A. In the process of folding sections A and B, sections a and b are overlapped, wherein the middle part from section a to section B is cut apart horizontally. After folding and alignment, the side edges C and D are first hot-pressed and packaged, and then the cylindrical winding core 20 is installed. The positive and negative pole tabs of the winding core 20 extend from the overlapping edges of section B and section A, and the pole tabs 21 on both sides are hot-pressed and packaged to obtain Figure 1 Finished packaging product.

[0032] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A soft pack battery, characterized in that: include: Soft package shell (10); A winding core (20) is built into the soft-package shell (10), and pole ears (21) are protrudingly provided at both ends of the winding core (20), and the pole ears (21) extend to the outside of the soft-package shell (10); and An air bag (30) is used to collect gas generated during the first charge and discharge of the battery, and the air bag (30) is arranged on the same side of the pole lug (21).

2. The soft pack battery according to claim 1, characterized in that: The winding core (20) is in a cylindrical structure.

3. The soft pack battery according to claim 1 or 2, characterized in that: The volume of the air bag (30) is 1 / 3 to 2 / 3 times the volume of the winding core (20).

4. The soft pack battery according to claim 1, characterized in that: The soft package shell (10) forms a hot-pressed edge-sealed structure on the side of the pole ear (21).

5. The soft pack battery according to claim 1, characterized in that: The soft package shell (10) wraps the winding core (20) so that the side wall of the winding core (20) fits with the inner wall of the soft package shell (10).

6. The soft pack battery according to claim 1, characterized in that: The inner diameter of the soft package shell (10) is 1.01-1.2 times the diameter of the winding core (20).

7. The soft pack battery according to claim 1 or 2, characterized in that: The length of the soft package shell (10) is 1.3 to 2 times the height of the winding core (20).

8. The soft pack battery according to claim 1, characterized in that: The thickness of the soft package shell (10) is 0.1-1 mm.

9. The soft pack battery according to claim 1, characterized in that: The soft package shell (10) is an aluminum-plastic composite film or a polyimide film.

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