Soft package battery structure with fusing structure

Abstract

The utility model discloses a soft package battery structure with a fusing structure. The soft package battery structure comprises an aluminum plastic film shell wrapped outside, and a positive tab and a negative tab, the positive tab and the negative tab are connected with a pole piece in the battery; the lower part of the positive tab is processed to form a fusing part, and the sectional area of the fusing part is smaller than that of other positions of the positive tab; tab insulation paste is arranged at the fusing part of the positive tab and covers the whole fusing part; and the aluminum-plastic film shell is connected with the tab insulation paste through heat sealing and hot melting. The soft package battery structure disclosed by the utility model solves the problem that in a high-energy-density battery cell system, when the battery is subjected to high-rate charging and discharging or an internal short circuit occurs, the current is sharply increased to possibly cause overheating of the battery, so that the risk of fire and explosion of the battery cell is reduced.

Description

Technical Field

[0001] This utility model relates to the field of soft-pack lithium-ion battery technology, and in particular to a soft-pack battery structure with a fusible structure. Background Technology

[0002] With the rapid growth of lithium-ion battery applications in power and energy storage, the industry's safety requirements for lithium batteries are also increasing. To avoid safety risks caused by internal short circuits in lithium batteries, appropriate fusing structures (such as fuse structures or circuit breaker structures) need to be designed inside the lithium battery to prevent thermal runaway caused by internal short circuits, which could lead to battery fires and explosions.

[0003] Therefore, based on the above-mentioned technical problems, those skilled in the art urgently need to develop a soft-pack battery structure with a fusible structure. Utility Model Content

[0004] The purpose of this invention is to provide a soft-pack battery structure with a fusible link structure. This soft-pack battery structure effectively solves the problem that existing soft-pack batteries do not have a fusible link structure, and also solves the problem that in high-energy-density cell systems, when the battery is charged and discharged at high rates or when an internal short circuit occurs, the current may rise sharply and cause the battery to overheat, thereby reducing the risk of cell fire and explosion.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] This utility model discloses a soft-pack battery structure with a fusible structure, the soft-pack battery structure comprising:

[0007] An aluminum-plastic film casing encased in the exterior; and

[0008] Positive and negative electrodes;

[0009] The positive electrode tab and the negative electrode tab are connected to the electrode plates inside the battery;

[0010] The lower part of the positive electrode tab is formed with a fusible portion, and the cross-sectional area of ​​the fusible portion is smaller than the cross-sectional area of ​​other parts of the positive electrode tab;

[0011] The positive electrode tab is provided with electrode insulating adhesive at the fused portion, and the electrode insulating adhesive covers the entire fused portion;

[0012] The aluminum-plastic film shell and the electrode insulating adhesive are connected by heat sealing and heat fusion.

[0013] Furthermore, the lower part of the positive electrode tab is formed as the fuse portion by machining at least one notch or through hole.

[0014] Furthermore, the opening of the notch or through hole is formed as a circle or a polygon.

[0015] Furthermore, the lower sides of the positive electrode tab are formed into the fuse portion by machining two notches;

[0016] The width N of the fuse portion is smaller than the width L of the positive electrode tab;

[0017] The length of the electrode tab insulating adhesive is greater than the width L of the positive electrode tab, and both ends of the electrode tab insulating adhesive extend outward.

[0018] Furthermore, the lower central region of the positive electrode tab is formed as the fuse portion by machining one or more through holes;

[0019] The sum of the widths of the remaining portions of the fuse section is less than the width L of the positive electrode tab;

[0020] The length of the electrode tab insulating adhesive is greater than the width L of the positive electrode tab, and both ends of the electrode tab insulating adhesive extend outward.

[0021] In the above technical solution, the soft-pack battery structure with a fusible structure provided by this utility model has the following beneficial effects:

[0022] The soft-pack battery structure of this utility model creates a fusible part by machining a notch or through hole at the bottom of the positive electrode tab, and then wraps the fusible part of the positive electrode tab with electrode tab insulating glue. The cross-sectional area of ​​the fusible part is the smallest part in the entire cell circuit. Therefore, in the event of thermal runaway, the soft-pack battery can be protected by the fracture of the fusible part. This solves the problem that in high-energy-density cell systems, when the battery is charged and discharged at high rates or when an internal short circuit occurs, the current may rise sharply and cause the battery to overheat, thereby reducing the risk of cell fire and explosion. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0024] Figure 1 This is a schematic diagram of a soft-pack battery structure with a fusible structure disclosed in an embodiment of this application.

[0025] Figure 2 This is a schematic diagram of the positive electrode tab of a soft-pack battery structure with a fusible structure disclosed in an embodiment of this application.

[0026] Figure 3This is a schematic diagram of the fuse portion of a first embodiment of the soft-pack battery structure with a fuse structure disclosed in this application.

[0027] Figure 4 This is a schematic diagram showing a through hole in the fuse portion of a second embodiment of the soft-pack battery structure with a fuse structure disclosed in this application.

[0028] Figure 5 This is a schematic diagram showing the opening of multiple through holes in the fuse portion of a second embodiment of the soft-pack battery structure with a fuse structure disclosed in this application.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1. Aluminum-plastic film casing;

[0031] 201. Positive tab; 202. Negative tab; 203. Tab insulating adhesive; 204. Fusible part; 205. Notch; 206. Through hole. Detailed Implementation

[0032] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0033] See Figures 1 to 5 As shown;

[0034] This embodiment discloses a soft-pack battery structure with a fusible structure, the soft-pack battery structure comprising:

[0035] The aluminum-plastic film casing 1 encased in the outer layer; and

[0036] Positive electrode 201 and negative electrode 202;

[0037] The positive tab 201 and the negative tab 202 are connected to the electrode plates inside the battery;

[0038] A fusible portion 204 is formed at the lower part of the positive electrode tab 201, and the cross-sectional area of ​​the fusible portion 204 is smaller than the cross-sectional area at other positions of the positive electrode tab 201.

[0039] A tab insulating adhesive 203 is provided at the fuse portion 204 of the positive tab 201, and the tab insulating adhesive 203 covers the entire fuse portion 204;

[0040] The aluminum-plastic film housing 1 and the electrode tab insulating adhesive 203 are connected by heat sealing and heat fusion.

[0041] Specifically, this embodiment discloses a soft-pack battery structure with a fusible link structure, which includes an aluminum-plastic film shell 1 wrapped around the outside, a positive electrode tab 201, and a negative electrode tab 202. Simultaneously, this embodiment processes a fusible link 204 at the lower part of the positive electrode tab 201. This fusible link 204 of the positive electrode tab 201 itself addresses the problem that in high-energy-density cell systems, during high-rate charging and discharging or when an internal short circuit occurs, the rapid increase in current may cause battery overheating, thereby reducing the risk of cell fire and explosion. This design simplifies the battery structure and avoids the drawbacks of needing to add separate fuse structures, circuit breakers, or other fusible link components. Furthermore, the negative electrode tab 202 in this embodiment does not have the aforementioned structure; the improvement is only made to the positive electrode tab 201. The soft-pack battery of this embodiment is externally covered by the aforementioned aluminum-plastic film shell 1, and the edges of the aluminum-plastic film shell 1 are sealed by heat pressing.

[0042] Preferably, in this embodiment, the lower part of the positive electrode tab 201 is formed as a fusible portion 204 by machining at least one notch 205 or through hole 206.

[0043] More preferably, the opening of the notch 205 or the through hole 206 in this embodiment is formed as a circle or a polygon.

[0044] Example 1:

[0045] Preferably, as the first embodiment of this application, the lower two sides of the positive electrode tab 201 of this embodiment are formed as a fusible part 204 by processing two notches 205;

[0046] The width N of the fuse section 204 is smaller than the width L of the positive electrode tab 201;

[0047] The length of the tab insulating adhesive 203 is greater than the width L of the positive tab 201, and both ends of the tab insulating adhesive 203 extend outward.

[0048] First, in this embodiment, the fusible portion 204 is formed by machining one or two notches on the side of the positive electrode tab 201. Because of the notches, the overall cross-sectional area of ​​the fusible portion 204 is smaller than the cross-sectional area of ​​other parts; specifically, the width N of the fusible portion 204 is smaller than the width L of the positive electrode tab 201. The dimensional relationship in this embodiment is: N = 3 / L, N = 1 / 2L, or N = 1 / 3L, etc.

[0049] Example 2:

[0050] Preferably, as a second embodiment of this application, the lower middle region of the positive electrode tab 201 in this second embodiment is formed as a fusible part by processing one or more through holes 206;

[0051] The sum of the widths of the remaining portions of the fuse section 204 is less than the width L of the positive electrode tab 201;

[0052] The length of the tab insulating adhesive 203 is greater than the width L of the positive tab 201, and both ends of the tab insulating adhesive 203 extend outward.

[0053] Secondly, in this second embodiment, the fusible portion 204 is formed by machining one or more through holes 206 in the lower middle region of the positive electrode tab 201. Other features are the same as in the first embodiment, and will not be repeated here.

[0054] More preferably, in this embodiment, the positive electrode tab 201 is made of aluminum, and the negative electrode tab 202 is made of copper plated with nickel.

[0055] The fuse 204 of the positive tab 201 in this embodiment can effectively prevent the battery from overheating and causing thermal runaway when the current rises sharply during an internal short circuit, thereby protecting the battery.

[0056] In this embodiment, the tab insulating adhesive 203 wraps the fuse part 204 to prevent the electric arc generated during the fuse from breaking through the aluminum-plastic film and reduce the risk of battery leakage.

[0057] In this embodiment, the tab insulating adhesive 203 fills the groove of the fusible part 204, increases the adhesion between the adhesive and the metal conductor, improves the encapsulation strength, reduces the risk of electrolyte leakage during use, and extends the service life of the soft-pack battery.

[0058] In the above technical solution, the soft-pack battery structure with a fusible structure provided by this utility model has the following beneficial effects:

[0059] The soft-pack battery structure of this utility model has a fusible part 204 formed by machining a notch 205 or a through hole 206 at the lower part of the positive tab 201, and the fusible part 204 of the positive tab 201 is wrapped with tab insulating glue 203. The cross-sectional area of ​​the fusible part 204 is the smallest part in the entire cell circuit. Therefore, the soft-pack battery can be protected by the fracture of the fusible part 204 in the event of thermal runaway. This solves the problem that in a high-energy-density cell system, when the battery is charged and discharged at a high rate or when an internal short circuit occurs, the current may rise sharply and cause the battery to overheat, thereby reducing the risk of cell fire and explosion.

[0060] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A pouch battery structure with a fusible link, the pouch battery structure comprising: An aluminum-plastic film casing (1) is wrapped around the outside; as well as Positive electrode (201) and negative electrode (202); The positive electrode tab (201) and the negative electrode tab (202) are connected to the electrode plates inside the battery; Its features are: The lower part of the positive electrode tab (201) is formed with a fusible part (204), and the cross-sectional area of ​​the fusible part (204) is smaller than the cross-sectional area of ​​other positions of the positive electrode tab (201); The positive electrode tab (201) is provided with electrode insulating adhesive (203) at the fuse portion (204), and the electrode insulating adhesive (203) covers the entire fuse portion (204); The aluminum-plastic film shell (1) and the electrode insulating adhesive (203) are connected by heat sealing and heat fusion.

2. The soft-pack battery structure with a fusible structure according to claim 1, characterized in that, The lower part of the positive electrode tab (201) is formed as the fuse portion (204) by machining at least one notch (205) or through hole (206).

3. The soft-pack battery structure with a fusible link structure according to claim 2, characterized in that, The opening of the notch (205) or through hole (206) is formed as a circle or a polygon.

4. The soft-pack battery structure with a fusible structure according to claim 2, characterized in that, The lower sides of the positive electrode tab (201) are formed into the fuse portion (204) by machining two notches (205); The width N of the fuse section (204) is smaller than the width L of the positive electrode tab (201); The length of the electrode insulating adhesive (203) is greater than the width L of the positive electrode (201), and both ends of the electrode insulating adhesive (203) extend outward.

5. A soft-pack battery structure with a fusible link structure according to claim 2, characterized in that, The lower central region of the positive electrode tab (201) is formed as the fuse portion (204) by machining one or more through holes (206); The sum of the widths of the remaining portions of the fuse section (204) is less than the width L of the positive electrode tab (201); The length of the electrode insulating adhesive (203) is greater than the width L of the positive electrode (201), and both ends of the electrode insulating adhesive (203) extend outward.

6. A soft-pack battery structure with a fusible structure according to any one of claims 1 to 5, characterized in that, The positive electrode tab (201) is made of aluminum, and the negative electrode tab (202) is made of copper plated with nickel.

Images