Packaging method of soft package battery and soft package battery

Abstract

The invention provides a packaging method of a soft package battery and the soft package battery. The packaging method comprises the steps that a battery cell is placed on an aluminum plastic film, the aluminum plastic film is folded in half in the width direction of the battery cell, the aluminum plastic film is made to form a wrapping part, two first parts to be sealed and a second part to be sealed, the wrapping part and the second part to be sealed are located between the two first parts to be sealed, and the second part to be sealed is arranged opposite to the wrapping part in the width direction of the battery cell; the second to-be-sealed part is subjected to point sealing treatment, a plurality of point sealing heads are formed, the point sealing heads are arranged at intervals in the length direction of the battery cell, and the point sealing heads are arranged close to the wrapping part. The second to-be-sealed part is used for forming an air bag after being subjected to heat sealing, and the air bag is communicated with the coating part; and point sealing is conducted on the side, close to the wrapping part, of the second to-be-sealed part, point sealing heads formed through point sealing are arranged at intervals in the length direction of the battery cell, so that an opening in the gas inlet side of the gas bag is narrowed, gas backflow into the battery cell is reduced, and bubbles on the interface of the battery cell are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of soft-pack battery packaging, and in particular to a soft-pack battery packaging method and a soft-pack battery. Background Art

[0002] As global climate change becomes increasingly serious, the new energy industry has become the focus of global attention. As China is the largest new energy vehicle market, the development trend of its power battery industry has naturally attracted much attention.

[0003] In order to meet the higher requirements of automobiles for driving range, with the continuous increase in energy density and the continuous decrease in the cost of power batteries, the cell interface has an important impact on battery performance. By improving the performance of the cell interface, the battery capacity, cycle stability, rate performance and safety can be effectively improved. At present, the packaging method of soft-pack batteries is prone to cause bubbles to appear on the cell interface, which in turn affects the performance of the battery.

[0004] To address the above-mentioned problems, no effective solution has been proposed yet. Summary of the invention

[0005] The main purpose of the present invention is to provide a packaging method for a soft-pack battery and a soft-pack battery to solve the technical problem of how to reduce bubbles on the interface of a battery cell.

[0006] To achieve the above-mentioned purpose, according to one aspect of the present invention, a packaging method for a soft-pack battery is provided, comprising: placing a battery cell on an aluminum-plastic film, folding the aluminum-plastic film in half along the width direction of the battery cell so that the aluminum-plastic film forms a covering portion, two first portions to be sealed and a second portion to be sealed, the covering portion and the second portion to be sealed are located between the two first portions to be sealed, and the second portion to be sealed is arranged opposite to the covering portion along the width direction of the battery cell; performing a spot sealing process on the second portion to be sealed to form a plurality of spot sealing heads, the plurality of spot sealing heads are arranged at intervals along the length direction of the battery cell, and the spot sealing heads are arranged close to the covering portion.

[0007] Furthermore, before the second portion to be sealed is subjected to the spot sealing treatment, the first portion to be sealed is subjected to the heat sealing treatment along the wide side of the battery cell.

[0008] Furthermore, before the second part to be sealed is point-sealed, the first part to be sealed is heat-sealed along the wide side of the battery cell, and the second part to be sealed is heat-sealed along the opening side of the second part to be sealed.

[0009] Further, the second part to be sealed is subjected to a spot sealing process, including: operating a spot sealing head of a spot sealing machine to move along the length direction of the battery cell to form a plurality of spot sealing heads.

[0010] Furthermore, before the spot sealing head of the spot sealing machine is operated to move along the length direction of the battery cell, a moving interval of the spot sealing head is set, and the moving interval is a fixed value.

[0011] Furthermore, before the spot sealing head of the operating spot sealing machine moves along the length direction of the battery cell, the distance between the spot sealing head and the battery cell is set to L1, wherein the distance between the spot sealing head and the opening side of the second portion to be sealed is L2, and L1≤L2 / 2.

[0012] Furthermore, before operating the spot sealing head of the spot sealing machine to move along the length direction of the battery cell, the spot sealing temperature of the spot sealing machine is set to 85±5°C, the spot sealing pressure is set to 0.1±0.04Mpa, and the spot sealing time is set to 4±2s.

[0013] Furthermore, before placing the battery core on the aluminum-plastic film, a groove matching the battery core is provided on the aluminum-plastic film.

[0014] Furthermore, the packaging method also includes: after the opening side edge of the second part to be sealed is heat-sealed, an air bag is formed in the second part to be sealed, and after the battery cell completes the formation process, the air bag is heat-sealed along the long side of the battery cell to form a first heat-sealed edge; after the first heat-sealed edge is formed, the air bag is heat-sealed along the point sealing head to form a second heat-sealed edge, and a shearing area is formed between the second heat-sealed edge and the first heat-sealed edge; the air bag is cut off along the shearing area.

[0015] According to another aspect of the present invention, a soft-pack battery is provided. The soft-pack battery is packaged using the above-mentioned packaging method.

[0016] By applying the technical solution of the present invention, the covering part of the aluminum-plastic film wraps the battery cell, the two first parts to be sealed are respectively arranged along the wide sides of the battery cell, the second part to be sealed is arranged along the long side of the battery cell, and the second part to be sealed is used to form an air bag after heat sealing, and the air bag is connected to the covering part; the side of the second part to be sealed close to the covering part is point-sealed, and the point-sealed heads formed by the point sealing are arranged at intervals along the length direction of the battery cell to reduce the opening on the air inlet side of the air bag, so as to reduce the reflux of gas in the air bag into the battery cell, reduce bubbles on the interface of the battery cell, improve the consistency and safety of the battery cell, and thus improve the performance of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0018] Figure 1 A schematic diagram showing a packaging process of a first embodiment of a soft-pack battery packaging method according to the present invention is shown;

[0019] Figure 2 A schematic diagram showing a packaging process of a second embodiment of a soft-pack battery packaging method according to the present invention is shown;

[0020] Figure 3 A schematic diagram of the packaging process of a third embodiment of a soft-pack battery packaging method according to the present invention is shown.

[0021] The above drawings include the following reference numerals:

[0022] 1. Coating part;

[0023] 2. The first waiting-to-be-sealed section;

[0024] 3. The second waiting-to-seal section;

[0025] 4. Point seal the head;

[0026] 5. First heat sealing edge;

[0027] 6. Second heat sealing;

[0028] 7. Cut area;

[0029] 8. Third heat sealing;

[0030] 9. The fourth step is heat sealing. DETAILED DESCRIPTION

[0031] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0032] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0033] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0034] Now, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments may be implemented in a variety of different forms and should not be construed as being limited to the embodiments described herein. It should be understood that these embodiments are provided to make the disclosure of the present application thorough and complete, and to fully convey the concepts of these exemplary embodiments to those of ordinary skill in the art. In the accompanying drawings, for the sake of clarity, the thickness of the layers and regions may be enlarged, and the same reference numerals are used to represent the same devices, and thus their descriptions will be omitted.

[0035] Combination Figures 1 to 3 As shown, according to a specific embodiment of the present application, a packaging method for a soft-pack battery is provided.

[0036] Specifically, the packaging method of the soft pack battery includes the following steps:

[0037] Place the battery cell on the aluminum-plastic film, and fold the aluminum-plastic film in half along the width direction of the battery cell to form a covering portion 1, two first portions to be sealed 2 and a second portion to be sealed 3. The covering portion 1 and the second portion to be sealed 3 are located between the two first portions to be sealed 2, and the second portion to be sealed 3 is arranged opposite to the covering portion 1 along the width direction of the battery cell.

[0038] It should be noted that the battery cell is a rectangular structure, the edge of the covering portion 1 is flush with the edge of the battery, two first sealing portions 2 are respectively arranged along the two wide sides of the covering portion 1, and a second sealing portion 3 is arranged along the long side of the covering portion 1. In the process of packaging the battery cell, the second sealing portion 3 is pre-sealed to form an air bag, which is used to contain the gas generated during the battery cell formation process; after the formation is completed, the air bag is heat-sealed along the long side of the covering portion 1, and then the air bag is cut off to complete the packaging of the battery cell.

[0039] The second portion to be sealed 3 is spot-sealed to form a plurality of spot-sealed heads 4 . The plurality of spot-sealed heads 4 are arranged at intervals along the length direction of the battery core, and the spot-sealed heads 4 are arranged close to the covering portion 1 .

[0040] In an embodiment of the present application, the covering portion 1 of the aluminum-plastic film wraps the battery cell, the two first parts to be sealed 2 are respectively arranged along the wide sides of the battery cell, the second part to be sealed 3 is arranged along the long side of the battery cell, and the second part to be sealed 3 is used to form an air bag after heat sealing, and the air bag is connected to the covering portion 1; the second part to be sealed 3 is point-sealed on one side close to the covering portion 1, and the point sealing heads 4 formed by the point sealing are arranged at intervals along the length direction of the battery cell to reduce the opening on the air inlet side of the air bag, so as to reduce the reflux of gas in the air bag into the battery cell, reduce bubbles on the interface of the battery cell, improve the consistency and safety of the battery cell, and thus improve the performance of the battery.

[0041] In an exemplary embodiment of the present application, before the second portion to be sealed 3 is point-sealed, the first portion to be sealed 2 is heat-sealed along the wide side of the battery cell.

[0042] Specifically, Figure 1 As shown, after the two first parts to be sealed 2 are heat-sealed, two fourth heat-sealed edges 9 are formed, and the fourth heat-sealed edges 9 seal the wide side of the covering part 1. At this time, the aluminum-plastic film has only one opening on the opening side of the second part to be sealed 3, that is, at this time, the covering part 1 has only one opening, and the electrolyte can be injected into the battery cell through the opening. Before the opening side of the second part to be sealed 3 is heat-sealed, the second part to be sealed 3 is spot-sealed. Among them, before injecting the electrolyte, the second part to be sealed 3 is spot-sealed to avoid chemical reaction of the electrolyte due to heat generated by the spot sealing.

[0043] In another exemplary embodiment of the present application, before the second portion to be sealed 3 is point-sealed, the first portion to be sealed 2 is heat-sealed along the wide side of the battery cell, and the second portion to be sealed 3 is heat-sealed along the open side of the second portion to be sealed 3.

[0044] Specifically, Figure 2 As shown, after the two first parts to be sealed 2 are heat-sealed, two fourth heat-sealed edges 9 are formed, and the fourth heat-sealed edges 9 seal the wide side of the covering part 1. At this time, the aluminum-plastic film has only one opening on the opening side of the second part to be sealed 3, that is, at this time, the covering part 1 has only one opening, and the electrolyte can be injected into the battery cell through the opening; after the electrolyte injection is completed, the opening side of the second part to be sealed 3 is heat-sealed to form a third heat-sealed edge 8, and the third heat-sealed edge 8 seals the opening side of the second part to be sealed 3 to form an air bag. After the opening side of the second part to be sealed 3 is heat-sealed, the second part to be sealed 3 is spot-sealed to reduce the opening on the air inlet side of the air bag.

[0045] In an exemplary embodiment of the present application, the second portion to be sealed 3 is subjected to a spot sealing process, including: operating a spot sealing head of a spot sealing machine to move along the length direction of the battery cell to form a plurality of spot sealing heads 4 .

[0046] The spot sealing head of the spot sealing machine is operated to move for spot sealing, and the battery cells to be packaged do not move to avoid misalignment between the battery cells and the aluminum-plastic film.

[0047] Specifically, the spot sealing machine includes an upper sealing head and a lower sealing head, the upper sealing head includes a convex portion, and the lower sealing head has a concave portion that matches the convex portion. When spot sealing the second part to be sealed 3, the upper and lower sealing heads are plugged and matched to form a spot sealing head 4. Among them, the shape of the spot sealing head 4 can be adjusted according to actual needs, and can be any shape such as round, rectangular, square, etc.

[0048] Preferably, the point sealing head 4 is circular in shape, and the diameter of the point sealing head 4 is 5 to 10 mm.

[0049] Furthermore, before the spot sealing head of the spot sealing machine is operated to move along the length direction of the battery cell, a moving interval of the spot sealing head is set, and the moving interval is a fixed value.

[0050] The moving interval is a fixed value, that is, the point sealing heads 4 are evenly spaced along the length direction of the battery cell. Compared with the case of non-evenly spaced distribution, the evenly spaced distribution of the point sealing heads 4 can further reduce the opening on the air inlet side of the air bag.

[0051] Specifically, Figure 1 As shown, the distance between two adjacent point-sealed heads 4 is L3. The number of point-sealed heads 4 is a, where a=cell length / 10-1, where a is an integer. L3=cell length / a.

[0052] Furthermore, before the spot sealing head of the operating spot sealing machine moves along the length direction of the battery cell, the distance between the spot sealing head and the battery cell is set to L1, wherein the distance between the spot sealing head and the opening side of the second sealing portion 3 is L2, and L1≤L2 / 2.

[0053] Before spot sealing, the spot sealing head of the spot sealing machine is placed close to the battery cell to further reduce the opening on the gas side of the air bag.

[0054] Furthermore, before operating the spot sealing head of the spot sealing machine to move along the length direction of the battery cell, the spot sealing temperature of the spot sealing machine is set to 85±5°C, the spot sealing pressure is set to 0.1±0.04Mpa, and the spot sealing time is set to 4±2s.

[0055] In an exemplary embodiment of the present application, before placing the battery cell on the aluminum-plastic film, a groove matching the battery cell is provided on the aluminum-plastic film.

[0056] The groove is set so that the battery cell is always located in the groove before packaging the battery cell, so as to ensure that the positioning of the battery cell is more accurate.

[0057] Specifically, the aluminum-plastic film is provided with a groove, and there is one groove. The battery cell is placed in the groove of the aluminum-plastic film, and then the aluminum-plastic film is folded in half. After the aluminum-plastic film is folded in half, the battery cell is still placed in the groove.

[0058] As an alternative embodiment, there are two grooves, which are spaced apart, and the distance between the two grooves is equal to the thickness of the battery cell. The battery cell is placed in one of the grooves of the aluminum-plastic film, and then the aluminum-plastic film is folded in half. After the aluminum-plastic film is folded in half, the battery cell is located between the upper and lower grooves.

[0059] In an exemplary embodiment of the present application, the packaging method further includes the following steps:

[0060] After the open side edge of the second portion to be sealed 3 is heat-sealed, an air bag is formed in the second portion to be sealed 3 . After the battery cell completes the formation process, the air bag is heat-sealed along the long side of the battery cell to form a first heat-sealed edge 5 .

[0061] Specifically, Figure 3 As shown, the open side of the second portion to be sealed 3 is heat-sealed to form a third heat-sealed edge 8, and the third heat-sealed edge 8 seals the open side of the second portion to be sealed 3 to form an air bag. After the battery cell completes the formation process, the air bag is heat-sealed along the long side of the battery cell to form a first heat-sealed edge 5 to seal the long side of the covering portion 1.

[0062] Among them, the role of formation is to activate the battery. It uses a small current charging to activate the positive and negative electrode materials inside the battery, and forms a SEI film on the negative electrode to make the battery performance more stable. The battery can only reflect its true performance after formation.

[0063] In most battery systems, the formation process will cause gas to be generated inside the battery. The generated gas enters the air bag. Before the first heat-sealed edge 5 is formed, the gas in the air bag needs to be extracted, but the gas in the air bag cannot be completely extracted.

[0064] After the first heat-sealed edge 5 is formed, the air bag is heat-sealed along the point-sealing head 4 to form a second heat-sealed edge 6 , and a shearing region 7 is formed between the second heat-sealed edge 6 and the first heat-sealed edge 5 .

[0065] The air bag is heat-sealed along the point-sealing head 4 to encapsulate the gas generated by the formation in the air bag to prevent the gas in the air bag from being discharged into the atmosphere.

[0066] It should be noted that the smaller the width of the shearing area 7 is, the better, that is, the smaller the distance between the second heat-sealed edge 6 and the first heat-sealed edge 5 is, the better.

[0067] The air bag is cut away along the shearing area 7.

[0068] In an exemplary embodiment of the present application, the packaging process of the soft pack battery is as follows:

[0069] Step S1: placing a battery cell on an aluminum-plastic film, and folding the aluminum-plastic film in half along the width direction of the battery cell to form a covering portion 1, two first portions to be sealed 2 and a second portion to be sealed 3. The covering portion 1 and the second portion to be sealed 3 are located between the two first portions to be sealed 2, and the second portion to be sealed 3 is arranged opposite to the covering portion 1 along the width direction of the battery cell.

[0070] Step S2: before spot-sealing the second portion to be sealed 3, heat-sealing the first portion to be sealed 2 along the wide side of the battery cell.

[0071] Step S3: performing spot sealing on the second portion to be sealed 3 to form a plurality of spot sealing heads 4 , wherein the plurality of spot sealing heads 4 are arranged at intervals along the length direction of the battery cell, and the spot sealing heads 4 are arranged close to the covering portion 1 .

[0072] Step S4: injecting electrolyte into the battery cell from the opening side of the second part to be sealed 3. After the electrolyte injection is completed, heat-sealing the opening side of the second part to be sealed 3 to form an air bag.

[0073] Step S5: performing a chemical forming process.

[0074] Step S6: After the battery cell completes the formation process, the air bag is heat-sealed along the long side of the battery cell to form a first heat-sealed edge 5; after the first heat-sealed edge 5 is formed, the air bag is heat-sealed along the point sealing head 4 to form a second heat-sealed edge 6, and a shearing area 7 is formed between the second heat-sealed edge 6 and the first heat-sealed edge 5, and the air bag is cut off along the shearing area 7.

[0075] In another exemplary embodiment of the present application, the packaging process of the soft pack battery is as follows:

[0076] Step S10: placing the battery cell on the aluminum-plastic film, and folding the aluminum-plastic film in half along the width direction of the battery cell to form a covering portion 1, two first portions to be sealed 2 and a second portion to be sealed 3. The covering portion 1 and the second portion to be sealed 3 are located between the two first portions to be sealed 2, and the second portion to be sealed 3 is arranged opposite to the covering portion 1 along the width direction of the battery cell.

[0077] Step S20: heat-seal the first portion to be sealed 2 along the wide side of the battery cell.

[0078] Step S30: injecting electrolyte into the battery cell from the opening side of the second part to be sealed 3. After the electrolyte injection is completed, heat-sealing the opening side of the second part to be sealed 3 to form a first heat-sealed edge 5, and the second part to be sealed 3 forms an air bag.

[0079] Step S40: performing spot sealing on the second portion to be sealed 3 to form a plurality of spot sealing heads 4 , wherein the plurality of spot sealing heads 4 are arranged at intervals along the length direction of the battery cell, and the spot sealing heads 4 are arranged close to the covering portion 1 .

[0080] Step S50: performing a forming process.

[0081] Step S60: After the battery cell has completed the formation process, the air bag is heat-sealed along the point sealing head 4 to form a second heat-sealed edge 6 , a shearing area 7 is formed between the second heat-sealed edge 6 and the first heat-sealed edge 5 , and the air bag is cut off along the shearing area 7 .

[0082] According to another specific embodiment of the present application, a soft-pack battery is provided, and the soft-pack battery is packaged using the packaging method in the above embodiment.

[0083] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0084] In the present invention, the covering part 1 of the aluminum-plastic film wraps the battery cell, the two first parts to be sealed 2 are respectively arranged along the wide sides of the battery cell, the second part to be sealed 3 is arranged along the long side of the battery cell, and the second part to be sealed 3 is used to form an air bag after heat sealing, and the air bag is connected to the covering part 1; the second part to be sealed 3 is spot-sealed on one side close to the covering part 1, and the spot sealing heads 4 formed by the spot sealing are arranged at intervals along the length direction of the battery cell to reduce the opening on the air inlet side of the air bag, so as to reduce the gas in the air bag from flowing back into the battery cell, reduce the bubbles on the interface of the battery cell, improve the consistency and safety of the battery cell, and thus improve the performance of the battery.

[0085] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0086] In addition to the above, it should be noted that "one embodiment", "another embodiment", "embodiment", etc. mentioned in this specification refer to the specific features, structures or characteristics described in conjunction with the embodiment included in at least one embodiment generally described in this application. The same expression appearing in multiple places in the specification does not necessarily refer to the same embodiment. Further, when describing a specific feature, structure or characteristic in conjunction with any embodiment, it is claimed that the realization of such feature, structure or characteristic in conjunction with other embodiments also falls within the scope of the present invention.

[0087] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0088] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A packaging method for a soft pack battery, characterized in that: include: Placing the battery cell on the aluminum-plastic film, folding the aluminum-plastic film in half along the width direction of the battery cell, so that the aluminum-plastic film forms a covering portion (1), two first portions to be sealed (2) and a second portion to be sealed (3), the covering portion (1) wraps the battery cell, the covering portion (1) and the second portion to be sealed (3) are both located between the two first portions to be sealed (2), and the second portion to be sealed (3) is arranged opposite to the covering portion (1) along the width direction of the battery cell; The second portion to be sealed (3) is subjected to a spot sealing process to form a plurality of spot sealing heads (4), wherein the plurality of spot sealing heads (4) are arranged at intervals along the length direction of the battery core, and the spot sealing heads (4) are arranged close to the covering portion (1).

2. The packaging method according to claim 1, characterized in that: Before the second portion to be sealed (3) is subjected to a spot sealing treatment, the first portion to be sealed (2) is subjected to a heat sealing treatment along the wide side of the battery cell.

3. The packaging method according to claim 1, characterized in that: Before the second portion to be sealed (3) is point-sealed, the first portion to be sealed (2) is heat-sealed along the wide side of the battery cell, and the second portion to be sealed (3) is heat-sealed along the open side of the second portion to be sealed (3).

4. The packaging method according to claim 1, characterized in that: Performing a point sealing process on the second portion to be sealed (3), comprising: The spot sealing head of the operating spot sealing machine moves along the length direction of the battery core to form a plurality of spot sealing heads (4).

5. The packaging method according to claim 4, characterized in that: Before operating the spot sealing head of the spot sealing machine to move along the length direction of the battery cell, a moving interval of the spot sealing head is set, and the moving interval is a fixed value.

6. The packaging method according to claim 4, characterized in that: Before operating the spot sealing head of the spot sealing machine to move along the length direction of the battery cell, the distance between the spot sealing head and the battery cell is set to L1, wherein the distance between the spot sealing head and the opening side of the second portion to be sealed (3) is L2, and L1≤L2 / 2.

7. The packaging method according to claim 4, characterized in that: Before operating the spot sealing head of the spot sealing machine to move along the length direction of the battery cell, the spot sealing temperature of the spot sealing machine is set to 85±5° C., the spot sealing pressure is set to 0.1±0.04 MPa, and the spot sealing time is set to 4±2 s.

8. The packaging method according to claim 1, characterized in that: Before placing the battery core on the aluminum-plastic film, a groove matching the battery core is provided on the aluminum-plastic film.

9. The packaging method according to claim 1, characterized in that: The packaging method further comprises: After the opening side edge of the second portion to be sealed (3) is heat-sealed, the second portion to be sealed (3) forms an air bag, and after the battery cell completes the formation process, the air bag is heat-sealed along the long side of the battery cell to form a first heat-sealed edge (5); After the first heat-sealed edge (5) is formed, the air bag is heat-sealed along the point-sealing head (4) to form a second heat-sealed edge (6), and a shearing region (7) is formed between the second heat-sealed edge (6) and the first heat-sealed edge (5); The air bag is cut away along the shearing area (7).

10. A soft pack battery, characterized in that: The soft-pack battery is packaged using the packaging method described in any one of claims 1 to 9.

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