Soft package battery aluminum plastic film structure and soft package battery

Abstract

The present disclosure provides a soft package battery aluminum plastic film structure and a soft package battery. The soft package battery aluminum plastic film structure comprises an aluminum plastic film body, the aluminum plastic film body is respectively formed with an electric core containing area and a gas pocket area, the electric core containing area is outwardly protruding to form a stamping pit, the stamping pit is used for accommodating an electric core, a first side of the stamping pit and a connecting part of the gas pocket area are formed with a double sealing edge, the gas pocket area is outwardly protruding to form an arched support pit, a top surface of the arched support pit is formed with a narrow channel horizontal support part, a bottom part of the arched support pit is formed with a wide opening, an area of the wide opening is greater than an area of the narrow channel horizontal support part, and the wide opening is parallel to edges of the double sealing edge and is respectively formed with a first round smooth transition surface and a second round smooth transition surface. The structure is beneficial to mechanical shaping and flaring, reduces the phenomenon of the injection needle top breaking the gas pocket area, and can better maintain the stability of the gas pocket area.

Description

Technical Field

[0001] This disclosure relates to the field of pouch battery manufacturing technology, and in particular to a pouch battery aluminum-plastic film structure and a pouch battery. Background Technology

[0002] In the production process of pouch batteries, a gas pocket area is generally reserved inside the aluminum-plastic film to collect gases generated during electrolyte injection or formation. For example, patent CN 217306608 U adds a support part to the gas pocket area, or patent CN216773360U adds a first punch top and a second punch top to the gas pocket area, and then folds along the fold lines of the aluminum-plastic film to form an automatically flared state for subsequent electrolyte injection.

[0003] However, folding the aluminum-plastic film leaves residual creases, which affects the subsequent secondary sealing effect. Therefore, some researchers have attempted a crease-free mechanical shaping and flaring method, but this presents two problems:

[0004] 1. The added support increases the structural strength of the air bag area, resulting in a tighter closure of the air bag area, which is not conducive to mechanical shaping and flaring.

[0005] 2. Since the first and second punch tops produced by stamping are generally square grooves, and the stress on the two vertical sides of the two sealing edges corresponding to the square grooves is relatively large, it is not only not conducive to mechanical shaping and flaring, but also causes the injection needle to rupture the air bag area. Utility Model Content

[0006] The purpose of this disclosure is to overcome the shortcomings of the prior art and provide a soft-pack battery aluminum-plastic film structure and soft-pack battery that is conducive to mechanical shaping and flaring, reduces the phenomenon of injection needle puncturing the air bag area, and can better maintain the stability of the air bag area.

[0007] The purpose of this disclosure is achieved through the following technical solution:

[0008] A soft-pack battery aluminum-plastic film structure includes an aluminum-plastic film body, wherein the aluminum-plastic film body has a cell receiving area and an air bag area respectively formed therein. The cell receiving area protrudes outward to form a stamping pit, which is used to accommodate the cell. Two sealing edges are formed at the connection between the first side of the stamping pit and the air bag area.

[0009] The air bag area protrudes outward to form an arched support pit. A narrow horizontal support section is formed on the top surface of the arched support pit. A wide opening is formed at the bottom of the arched support pit. The area of ​​the wide opening is larger than the area of ​​the narrow horizontal support section. A first smooth transition surface and a second smooth transition surface are formed parallel to the edges of the two sealing edges, respectively.

[0010] In one embodiment, the cross-section of the arched support pit is trapezoidal, narrower at the top and wider at the bottom.

[0011] In one embodiment, the arched support pit further includes a first inclined sidewall, a first vertical sidewall, a second inclined sidewall, and a second vertical sidewall connected end to end;

[0012] The first inclined sidewall is provided correspondingly to the second inclined sidewall and is parallel to the two sealing edges. The first smooth transition surface is connected to the first side of the narrow passage horizontal support part through the first inclined sidewall, and the second smooth transition surface is connected to the second side of the narrow passage horizontal support part through the second inclined sidewall.

[0013] The first vertical sidewall is provided in correspondence with the second vertical sidewall, and the first vertical sidewall and the second vertical sidewall are respectively connected to the third side and the fourth side of the narrow passage horizontal support.

[0014] In one embodiment, the inclination angle of the first inclined sidewall is 1°-20°; and / or,

[0015] The inclination angle of the second inclined sidewall is 1°-20°.

[0016] In one embodiment, the area ratio of the narrow horizontal support to the wide opening is (0.5-2.0):(13-20).

[0017] In one embodiment, the width of the narrow horizontal support is 2mm-5mm; and / or,

[0018] The width of the wide opening is 25mm-40mm.

[0019] In one embodiment, the height of the arched support pit is 1mm-5mm.

[0020] In one embodiment, the area of ​​the first smooth transition surface is greater than the area of ​​the second smooth transition surface.

[0021] In one embodiment, the aluminum-plastic film body is sequentially formed along its length direction with a first air bag area, a first battery cell receiving area, a second battery cell receiving area, a folding area, and a second air bag area;

[0022] The first air bag area and / or the second air bag area protrude outward to form the arched support pit;

[0023] The first and second cell receiving sub-regions respectively protrude outward to form a first stamping indentation and a second stamping indentation. After the first and second cell receiving sub-regions are folded along the folding area, the first and second stamping indentations abut against each other to form the stamping indentation. The first and second air bag regions abut against each other to form the air bag region; and / or

[0024] The second and third sides of the stamping pit are respectively formed with side sealing edges.

[0025] A pouch battery, comprising the pouch battery aluminum-plastic film structure described in any of the above embodiments.

[0026] Compared with the prior art, this disclosure has at least the following advantages:

[0027] 1) Because the air bag area protrudes outward to form an arched support pit, the top surface of the arched support pit forms a narrow horizontal support part, and the bottom of the arched support pit forms a wide opening. The area of ​​the wide opening is larger than the area of ​​the narrow horizontal support part, so as to ensure that an arched support pit that is narrow at the top and wide at the bottom is formed. This not only facilitates mechanical shaping and flaring, but also better maintains the stability of the air bag area when it is opened, which is conducive to the discharge of gas.

[0028] 2) Since the wide opening is parallel to the edges of the two sealing edges and forms a first smooth transition surface and a second smooth transition surface respectively, the stress on the edges of the arched support pit corresponding to the two sealing edges is effectively reduced, and the stress in the air bag area is further reduced, which is more conducive to mechanical shaping and flaring. It also reduces the blocking area on the injection needle, ensuring smooth passage of the injection needle and effectively reducing the phenomenon of the injection needle puncturing the air bag area. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this disclosure and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of one direction of the aluminum-plastic film structure of a soft-pack battery according to an embodiment of the present invention;

[0031] Figure 2 This is a schematic diagram of the folded aluminum-plastic film structure of a soft-pack battery according to an embodiment of the present invention;

[0032] Figure 3 for Figure 2 A cross-sectional view of the aluminum-plastic film structure of the soft-pack battery shown in one direction;

[0033] Figure 4 for Figure 3 The enlarged view shown at point A in the middle;

[0034] Figure 5 for Figure 4 The enlarged view shown at point B in the middle;

[0035] Figure 6 This is a physical image of the aluminum-plastic film structure of a soft-pack battery according to an embodiment of the present invention;

[0036] Reference numerals: 10, Aluminum-plastic film structure of soft-pack battery; 110, Cell receiving area; 111a, First cell receiving sub-area; 111b, Second cell receiving sub-area; 112, Stamping pit; 1121, First stamping sub-pit; 1122, Second stamping sub-pit; 120, Air bag area; 121, First air bag area; 122, Second air bag area; 123, Arched support pit; 1231, Narrow horizontal support section; 1232, Wide opening; 1232a, First smooth transition surface; 1232b, Second smooth transition surface; 1233, First inclined sidewall; 1234, Second inclined sidewall; 1235, First vertical sidewall; 1236, Second vertical sidewall; 130, Second sealing edge; 140, Folding area; 150, Side sealing edge. Detailed Implementation

[0037] To facilitate understanding of this disclosure, a more complete description will be given below with reference to the accompanying drawings, which illustrate preferred embodiments of the present disclosure. However, this disclosure can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure.

[0038] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this disclosure. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0040] To better understand the technical solutions and beneficial effects of this disclosure, the following detailed description is provided in conjunction with specific embodiments:

[0041] Please see Figures 1 to 3 One embodiment of the soft-pack battery aluminum-plastic film structure 10 includes an aluminum-plastic film body. The aluminum-plastic film body has a cell receiving area 110 and an air bag area 120 respectively. The cell receiving area 110 protrudes outward to form a stamping pit 112, which is used to receive the cell. A second sealing edge 130 is formed at the connection between the first side of the stamping pit 112 and the air bag area 120. The second sealing edge 130 forms a liquid injection port, which is used to ensure the normal progress of the liquid injection operation and also facilitates the discharge of gas inside the cell. Within the airbag area 120, an arched support pit 123 protrudes outward from the airbag area 120. A narrow horizontal support section 1231 is formed on the top surface of the arched support pit 123, and a wide opening 1232 is formed at the bottom of the arched support pit 123. The area of ​​the wide opening 1232 is larger than the area of ​​the narrow horizontal support section 1231. The wide opening 1232, parallel to the edges of the two sealing edges 130, forms a first smooth transition surface 1232a and a second smooth transition surface 1232b, respectively. Please refer to both descriptions. Figure 4 and Figure 5 .

[0042] It is understandable that, due to the outward protrusion of the airbag area 120 forming an arched support pit 123, such as Figure 6 As shown, a narrow horizontal support portion 1231 is formed on the top surface of the arched support pit 123, and a wide opening 1232 is formed at the bottom of the arched support pit 123. The area of ​​the wide opening 1232 is larger than the area of ​​the narrow horizontal support portion 1231, so as to ensure that the arched support pit 123 is narrow at the top and wide at the bottom. This not only facilitates mechanical shaping and widening, but also maintains the stability of the air bag area 120 when it is opened, which is conducive to the discharge of gas.

[0043] Since the wide opening 1232 has a first smooth transition surface 1232a and a second smooth transition surface 1232b respectively formed parallel to the edges of the two sealing edges 130, the stress of the arched support pit 123 corresponding to the edges of the two sealing edges 130 is effectively reduced, and the stress of the air bag area 120 is further reduced, which is more conducive to mechanical shaping and flaring. It also reduces the blocking area of ​​the injection needle, ensuring smooth passage of the injection needle and effectively reducing the phenomenon of the injection needle puncturing the air bag area 120.

[0044] like Figure 3As shown, in one embodiment, the aluminum-plastic film body sequentially forms a first air bag region 121, a first battery cell receiving sub-region 111a, a second battery cell receiving sub-region 111b, a folding region 140, and a second air bag region 122 along its length direction; the first air bag region 121 and / or the second air bag region 122 protrude outward to form the arched support pit 123; the first battery cell receiving sub-region 111a and the second battery cell receiving sub-region 111b respectively protrude outward to form the first stamping sub-pit. 1121 and the second stamping pit 1122: When the first cell receiving area 111a and the second cell receiving area 111b are folded along the folding area 140, the first stamping pit 1121 and the second stamping pit 1122 abut against each other to form the stamping pit 112 to accommodate the cell. The first air bag area 121 and the second air bag area 122 abut against each other to form the air bag area 120, so that the liquid injection port of the second sealing edge 130 can discharge the gas in the cell into the air bag area 120.

[0045] like Figure 1 As shown, in one embodiment, since the second and third sides of the stamping pit 112 are respectively formed with side sealing edges 150, the stamping pit 112 is sealed, which is beneficial to completing the subsequent liquid injection and formation operations.

[0046] like Figure 3 and Figure 4 As shown, in one embodiment, the cross-section of the arched support pit 123 is a trapezoidal shape that is narrower at the top and wider at the bottom, so as to ensure that the arched support pit 123 has good structural stability.

[0047] Specifically, such as Figure 1 and Figure 2As shown, in one embodiment, the arched support pit 123 further includes a first inclined sidewall 1233, a first vertical sidewall 1235, a second inclined sidewall 1234, and a second vertical sidewall 1236 connected end to end; and since the first inclined sidewall 1233 and the second inclined sidewall 1234 are correspondingly arranged and parallel to the two sealing edges 130, the first smooth transition surface 1232a is connected to the first side of the narrow passage horizontal support portion 1231 through the first inclined sidewall 1233, and the second smooth transition surface 1232b is connected to the second side of the narrow passage horizontal support portion 1231 through the second inclined sidewall 1234, and the first vertical sidewall 1235... 235 is correspondingly provided with the second vertical sidewall 1236. The first vertical sidewall 1235 and the second vertical sidewall 1236 are respectively connected to the third side and the fourth side of the narrow passage horizontal support 1231, so that the added first smooth transition surface 1232a and the second smooth transition surface 1232b can better buffer the problem of stress concentration of the first inclined sidewall 1233 and the second inclined sidewall 1234. The first vertical sidewall 1235, the second vertical sidewall 1236 and the narrow passage horizontal support 1231 can provide better structural support for the arched support pit 123, so as to ensure that the arched support pit 123 has good structural stability while meeting the requirements of low stress.

[0048] In one embodiment, the inclination angle of the first inclined sidewall 1233 is 1°-20°, especially in conjunction with the inclination angle of the second inclined sidewall 1234 being 1°-20°, the area ratio of the narrow horizontal support portion 1231 to the wide opening 1232 being (0.5-2.0):(13-20), and the height of the arched support pit 123 being 1mm-5mm, to ensure that the arched support pit 123 meets the requirements of low stress while also having good structural stability.

[0049] In a preferred embodiment, the width of the narrow horizontal support portion 1231 is 2mm-5mm and the width of the wide opening 1232 is 25mm-40mm, so as to ensure that the area of ​​the narrow horizontal support portion 1231 and the wide opening 1232 is suitable, so as to ensure that the arched support pit 123 meets the requirements of lower stress while also having better structural stability.

[0050] In one embodiment, the area of ​​the first smooth transition surface 1232a is larger than the area of ​​the second smooth transition surface 1232b. The area of ​​the first smooth transition surface 1232a is located away from the second sealing edge 130, and the area of ​​the second smooth transition surface 1232b is located close to the second sealing edge 130. This arrangement ensures that the first smooth transition surface 1232a is located near the opening of the air bag area 120, and the second smooth transition surface 1232b is located near the bottom of the air bag area 120. This ensures that the stress near the opening of the air bag area 120 is smaller, which is more conducive to mechanical shaping and flaring. The stress at the bottom of the air bag area 120 is larger than that at the opening of the air bag area 120, so as to better maintain the stability of the air bag area 120 when it is opened.

[0051] This disclosure also provides a pouch battery, including the pouch battery aluminum-plastic film structure 10 described in any of the above embodiments.

[0052] Compared with the prior art, this disclosure has at least the following advantages:

[0053] 1) Because the air bag area 120 protrudes outward to form an arched support pit 123, the top surface of the arched support pit 123 forms a narrow horizontal support part 1231, and the bottom of the arched support pit 123 forms a wide opening 1232. The area of ​​the wide opening 1232 is larger than the area of ​​the narrow horizontal support part 1231, so as to ensure that the arched support pit 123 is narrow at the top and wide at the bottom. This not only facilitates mechanical shaping and flaring, but also better maintains the stability of the air bag area 120 when it is opened, which is conducive to the discharge of gas.

[0054] 2) Since the wide opening 1232 has a first smooth transition surface 1232a and a second smooth transition surface 1232b respectively formed parallel to the edges of the two sealing edges 130, the stress of the arched support pit 123 corresponding to the edges of the two sealing edges 130 is effectively reduced, and the stress of the air bag area 120 is further reduced, which is more conducive to mechanical shaping and flaring. It also reduces the blocking area of ​​the injection needle, ensuring smooth passage of the injection needle and effectively reducing the phenomenon of the injection needle puncturing the air bag area 120.

[0055] The embodiments described above are merely illustrative of several implementations of this disclosure, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the disclosed patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this disclosure, and these all fall within the protection scope of this disclosure. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A soft-pack battery aluminum-plastic film structure, comprising an aluminum-plastic film body, wherein the aluminum-plastic film body has a cell receiving area and an air bag area respectively formed therein, the cell receiving area protrudes outward to form a stamping pit, the stamping pit is used to receive the cell, and a second sealing edge is formed at the connection between the first side of the stamping pit and the air bag area, characterized in that, The air bag area protrudes outward to form an arched support pit. A narrow horizontal support section is formed on the top surface of the arched support pit. A wide opening is formed at the bottom of the arched support pit. The area of ​​the wide opening is larger than the area of ​​the narrow horizontal support section. A first smooth transition surface and a second smooth transition surface are formed parallel to the edges of the two sealing edges, respectively.

2. The soft-pack battery aluminum-plastic film structure according to claim 1, characterized in that, The cross-section of the arched support pit is trapezoidal, narrower at the top and wider at the bottom.

3. The soft-pack battery aluminum-plastic film structure according to claim 2, characterized in that, The arched support pit also includes a first inclined sidewall, a first vertical sidewall, a second inclined sidewall, and a second vertical sidewall connected end to end; The first inclined sidewall is provided correspondingly to the second inclined sidewall and is parallel to the two sealing edges. The first smooth transition surface is connected to the first side of the narrow passage horizontal support part through the first inclined sidewall, and the second smooth transition surface is connected to the second side of the narrow passage horizontal support part through the second inclined sidewall. The first vertical sidewall is provided in correspondence with the second vertical sidewall, and the first vertical sidewall and the second vertical sidewall are respectively connected to the third side and the fourth side of the narrow passage horizontal support.

4. The soft-pack battery aluminum-plastic film structure according to claim 3, characterized in that, The inclination angle of the first inclined sidewall is 1°-20°; and / or, The inclination angle of the second inclined sidewall is 1°-20°.

5. The soft-pack battery aluminum-plastic film structure according to claim 1, characterized in that, The area ratio of the narrow horizontal support to the wide opening is (0.5-2.0):(13-20).

6. The soft-pack battery aluminum-plastic film structure according to claim 5, characterized in that, The width of the narrow horizontal support section is 2mm-5mm; and / or, The width of the wide opening is 25mm-40mm.

7. The soft-pack battery aluminum-plastic film structure according to claim 1, characterized in that, The height of the arched support pit is 1mm-5mm.

8. The soft-pack battery aluminum-plastic film structure according to claim 7, characterized in that, The area of ​​the first smooth transition surface is greater than the area of ​​the second smooth transition surface.

9. The soft-pack battery aluminum-plastic film structure according to claim 1, characterized in that, The aluminum-plastic film body is sequentially formed along its length by a first air bag area, a first battery cell receiving area, a second battery cell receiving area, a folding area, and a second air bag area. The first air bag area and / or the second air bag area protrude outward to form the arched support pit; The first and second cell receiving sub-regions respectively protrude outward to form a first stamping indentation and a second stamping indentation. After the first and second cell receiving sub-regions are folded along the folding area, they abut against each other to form the cell receiving area, and the first and second stamping indentations together form the stamping indentation. The first and second air bag areas abut against each other to form the air bag area; and / or, The second and third sides of the stamping pit are respectively formed with side sealing edges.

10. A pouch battery, characterized in that, The soft-pack battery aluminum-plastic film structure includes any one of claims 1-9.

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