Packaging structure, battery production line and battery production method

Abstract

The invention discloses a packaging structure, a battery production line and a battery production method, and belongs to the technical field of batteries. The packaging structure comprises a packaging film, a plurality of containing cavities used for containing pole cores and at least one air bag used for collecting air from the containing cavities are formed, and the containing cavities are distributed on the two sides of the air bag in the first direction. The side, deviating from the air bag in the first direction, of the containing cavity and the two ends, in the second direction, of the containing cavity are each provided with a pre-sealing area, the side, close to the air bag in the first direction, of the containing cavity is provided with a second sealing area, and the first direction intersects with the second direction. Through the layout design of the plurality of accommodating cavities and the at least one air bag, multiple battery cells can be produced at a time, the production efficiency is improved, the manpower and equipment cost is reduced, meanwhile, the multiple battery cells share one air bag, the use number of the air bags is reduced, the consumption of aluminum plastic films is reduced, and the production cost is further reduced.

Description

Technical Field

[0001] The present application belongs to the field of battery technology, and in particular relates to a packaging structure, a battery production line and a battery production method. Background Art

[0002] In the traditional manufacturing process of soft-pack batteries, the assembly and testing process usually adopts the method of producing one battery cell at a time, including aluminum-plastic film punching, pre-sealing, liquid injection, formation, secondary sealing and other processes are all single-cell operations. However, this model not only has low production efficiency, but also increases production costs. In addition, each battery cell uses a separate air bag in the formation and exhaust stage, which is cut and scrapped after completing its function, which not only causes a huge waste of aluminum-plastic film, but also further pushes up production costs. Summary of the invention

[0003] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a packaging structure, a battery production line and a battery production method, which realizes the production of multiple cells at a time, improves production efficiency, and realizes that multiple cores share one air bag, reducing production costs.

[0004] In a first aspect, the present application provides a packaging structure, including:

[0005] A packaging film is provided to form a plurality of accommodating cavities for accommodating the pole core and at least one air bag for collecting gas from the accommodating cavities, wherein the plurality of accommodating cavities are distributed on both sides of the air bag along a first direction, the accommodating cavity has a pre-sealed area on the side away from the air bag along the first direction and on both ends along a second direction, and the accommodating cavity has a second sealed area on the side close to the air bag along the first direction, wherein the first direction and the second direction intersect.

[0006] According to the packaging structure of the present application, through the layout design of the above-mentioned multiple accommodating cavities and at least one air bag, it is possible to achieve a single production of multiple battery cells. Compared with the traditional single battery cell production method, it greatly improves the production efficiency, shortens the production cycle, and reduces the cost of manpower and equipment. At the same time, it achieves multiple pole cores sharing one air bag, reducing the number of air bags used and the consumption of aluminum-plastic film, thereby greatly reducing material costs and further reducing production costs.

[0007] According to an embodiment of the present application, two groups of the accommodating cavities located on both sides of the airbag are arranged opposite to each other along the first direction.

[0008] According to one embodiment of the present application, the plurality of accommodating cavities located on either side of the airbag are arranged relatively to each other along the second direction, and the two pre-sealed areas located between two adjacent accommodating cavities along the second direction are spaced apart and distributed along the second direction.

[0009] According to an embodiment of the present application, the encapsulation structure has an ear tab lead-out area and a liquid injection area. The ear tab lead-out area is connected to at least one end of the accommodation cavity along the second direction. At least one end of the air bag along the second direction is provided with the liquid injection area, and the liquid injection area communicates with at least a part of the accommodation cavity located on both sides of the air bag. Both sides of the liquid injection area along the first direction are connected to the pre-sealing area, and the ear tab lead-out area and the pre-sealing area have an overlapping area.

[0010] According to the encapsulation structure of the present application, through the layout design of the above-mentioned pre-sealing area, ear tab lead-out area and liquid injection area, the ear tab and the encapsulation structure are synchronously sealed during the pre-sealing process, without affecting the subsequent liquid injection process, maintaining the smooth progress of the encapsulation process. Moreover, the design that the liquid injection area communicates with multiple accommodation cavities reduces the number of reserved liquid injection ports required compared with the design where each accommodation cavity is matched with a liquid injection area, thereby significantly reducing the encapsulation difficulty, simplifying the encapsulation steps, and then greatly accelerating the encapsulation efficiency.

[0011] According to an embodiment of the present application, the packaging film includes two layers of film pieces stacked vertically. The accommodation cavity and the air bag are formed between the two layers of film pieces, and both layers of film pieces have the pre-sealing area, the second sealing area, the ear tab lead-out area and the liquid injection area.

[0012] According to an embodiment of the present application, the packaging film further includes a folding section connecting the two layers of film pieces. The folding section is provided with a first avoidance opening and a second avoidance opening penetrating along the second direction. The ear tab lead-out area close to the folding section is arranged opposite to the first avoidance opening along the second direction, and the liquid injection area close to the folding section is arranged opposite to the second avoidance opening along the second direction.

[0013] In a second aspect, the present application provides a battery production line, which includes:

[0014] An aluminum-plastic film processing device for preparing the encapsulation structure as described in any one of the above;

[0015] An encapsulation device including a pre-sealing mechanism and a second-sealing mechanism. The pre-sealing mechanism is used to thermally press the pre-sealing area of the encapsulation structure, and the second-sealing mechanism is used to thermally press the second-sealing area of the encapsulation structure.

[0016] According to the battery production line of the present application, through the automated design of the above-mentioned aluminum-plastic film processing device and encapsulation device, the time and labor intensity of manual operation are reduced, the rapid preparation and encapsulation of the encapsulation structure are realized, and at the same time, equipment support is provided for producing multiple battery cores at a time, greatly shortening the production cycle, increasing the output per unit time, and thus improving the production efficiency of the entire battery production line.

[0017] According to an embodiment of the present application, the pre-sealing mechanism includes pre-sealing heads arranged in pairs and used for clamping the packaging structure, and the second-sealing mechanism includes second-sealing heads arranged in pairs and used for clamping the packaging structure; wherein, the pre-sealing heads form an opening penetrating along the second direction, the opening is used for avoiding the liquid injection area of the packaging structure, grooves are provided on the lower surface of the upper pre-sealing head and the upper surface of the lower pre-sealing head, and the bottom wall of the groove is suitable for pressing on the tab lead-out area of the packaging structure.

[0018] According to the battery production line of the present application, by providing the opening and the groove on the pre-sealing head as described above, the liquid injection area is effectively protected, which helps to smoothly form a liquid injection port in the liquid injection area after pre-sealing, enabling the battery cell to be normally injected with liquid in subsequent processes. At the same time, the groove can match the thickness of the tab stacked with the aluminum-plastic film, and without damaging the tab, the sealing at the tab is achieved, maximizing the packaging effect at the tab, reducing the risk of liquid leakage at the tab of the battery cell, thereby improving the performance and safety of the battery. Moreover, the pre-sealing heads and the second-sealing heads are arranged in pairs and can provide stable and uniform pressure, optimizing the packaging effect. At the same time, by adjusting the structures of the pre-sealing heads and the second-sealing heads, the battery production line can adapt to different sizes and specifications of packaging requirements.

[0019] According to an embodiment of the present application, the battery production line further includes:

[0020] A loading device for loading a plurality of battery cores to corresponding positions of the aluminum-plastic film;

[0021] A slitting device for splitting a plurality of packaged battery cells.

[0022] In a third aspect, the present application provides a battery production method, which is applied to the battery production line according to any one of the above, and the battery production method includes:

[0023] Controlling an aluminum-plastic film processing device to punch the aluminum-plastic film so that a plurality of first pits and at least one second pit are formed on the aluminum-plastic film;

[0024] Controlling the loading device to place a plurality of battery cores into some of the first pits;

[0025] Controlling the aluminum-plastic film processing device to fold the aluminum-plastic film along the folding line so that the plurality of first pits form a plurality of accommodating cavities, and the at least one second pit forms at least one air bag, obtaining a packaging structure.

[0026] According to the battery production method of the present application, through the design of the preparation process of the above-mentioned packaging structure, the automated pit punching and folding operations of the aluminum-plastic film processing device, and the efficient feeding of the feeding device, the time and complexity of manual operations are reduced, rapid pit punching, feeding, and the formation of the packaging structure are achieved, and the continuous operation and automated control of each process are realized, significantly shortening the production cycle, increasing the output per unit time of the entire battery production line, and at the same time realizing the processing and forming of multiple accommodating cavities and at least one air bag, providing a preliminary structural basis for producing multiple battery cores at a single time and sharing one air bag by multiple electrode cores during the formation process.

[0027] According to an embodiment of the present application, after controlling the aluminum-plastic film processing device to fold the aluminum-plastic film along the folding line, so that the multiple first pits form multiple accommodating cavities, and the at least one second pit forms at least one air bag to obtain a packaging structure, it further includes:

[0028] Controlling the pre-sealing mechanism of the packaging device to hot-press the pre-sealing area of the packaging structure, so that the liquid injection area of the packaging structure forms a liquid injection port, and leaving an unsealed side between each accommodating cavity and the air bag;

[0029] Injecting electrolyte into each accommodating cavity through the liquid injection port and the unsealed side;

[0030] Performing a formation operation on the electrode cores in each accommodating cavity, and collecting the gas generated by the electrode cores from the unsealed side through the air bag;

[0031] Controlling the second-sealing mechanism of the packaging device to hot-press the second-sealing area of the packaging structure and seal the unsealed side;

[0032] Controlling the slitting device to cut the packaging structure along the separation line to separate each battery core after packaging.

[0033] According to an embodiment of the present application, in the case where the packaging film of the packaging structure is provided with a first avoidance opening and a second avoidance opening, after controlling the aluminum-plastic film processing device to punch pits in the aluminum-plastic film so that multiple first pits and at least one second pit are formed on the aluminum-plastic film, it further includes:

[0034] Controlling the aluminum-plastic film processing device to cut out multiple reserved openings at the folding line of the aluminum-plastic film, so that the multiple reserved openings form the first avoidance opening and the second avoidance opening after the aluminum-plastic film is folded.

[0035] Additional aspects and advantages of the present application will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present application. Description of the Drawings

[0036] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, where:

[0037] Figure 1 is a schematic structural diagram of the encapsulation structure provided by an embodiment of the present application;

[0038] Figure 2 is one of the partial structural schematic diagrams of the packaging film provided by an embodiment of the present application;

[0039] Figure 3 is another partial structural schematic diagram of the packaging film provided by an embodiment of the present application;

[0040] Figure 4 is a schematic diagram of the processing position of the aluminum-plastic film provided by an embodiment of the present application;

[0041] Figure 5 is a schematic diagram of the processing position of the pre-sealing of the encapsulation structure provided by an embodiment of the present application;

[0042] Figure 6 is a schematic diagram of the processing position of the second sealing of the encapsulation structure provided by an embodiment of the present application;

[0043] Figure 7 is one of the structural schematic diagrams of the pre-sealing mechanism provided by an embodiment of the present application;

[0044] Figure 8 is another structural schematic diagram of the pre-sealing mechanism provided by an embodiment of the present application;

[0045] Figure 9 is a schematic diagram of the cooperation between the pre-sealing mechanism and the encapsulation structure provided by an embodiment of the present application;

[0046] Figure 10 is a structural schematic diagram of the second-sealing mechanism provided by an embodiment of the present application;

[0047] Figure 11 is a schematic diagram of the cooperation between the second-sealing mechanism and the encapsulation structure provided by an embodiment of the present application;

[0048] Figure 12 is a schematic flowchart of the battery production method provided by an embodiment of the present application.

[0049] Reference numerals:

[0050] Encapsulation structure 10;

[0051] Packaging film 11, accommodation cavity 111, air bag 112, film piece 113, folding section 114, first avoidance opening 1141, second avoidance opening 1142;

[0052] Pre-sealing area 12, second-sealing area 13, tab lead-out area 14, liquid injection area 15;

[0053] Aluminum-plastic film 20, first pit 21, second pit 22, reserved opening 23;

[0054] A pole core 30, a first pole ear 31, and a second pole ear 32;

[0055] Pre-sealed head 40, opening 41, groove 42;

[0056] Second seal head 50. DETAILED DESCRIPTION

[0057] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0058] The present application provides a packaging structure 10 .

[0059] Reference below Figures 1 - 12 A package structure 10 according to an embodiment of the present application is described.

[0060] In some embodiments, Figure 1 As shown, the packaging structure 10 includes: a packaging film 11.

[0061] like Figure 1 , Figure 5 and Figure 6 As shown, the packaging film 11 forms a plurality of accommodating cavities 111 for accommodating the pole core 30 and at least one air bag 112 for collecting gas from the accommodating cavity 111, the plurality of accommodating cavities 111 are distributed on both sides of the air bag 112 along a first direction, the accommodating cavity 111 has a pre-sealed area 12 on the side away from the air bag 112 along the first direction and at both ends along the second direction, the accommodating cavity 111 has a second sealed area 13 on the side close to the air bag 112 along the first direction, wherein the first direction and the second direction intersect.

[0062] The packaging film 11 is usually made of an aluminum-plastic film 20 material. The aluminum-plastic film 20 can be processed into a plurality of accommodating cavities 111 and at least one air bag 112 by a process such as stamping, wherein the term "plurality" means two or more.

[0063] For example, in one embodiment, Figure 1 , Figure 5 and Figure 6As shown, the packaging film 11 can form four accommodating cavities 111 and one air bag 112, that is, the four accommodating cavities 111 share one air bag 112. Specifically, two accommodating cavities 111 can be set on either side of the air bag 112 along the first direction to form two pairs of accommodating cavities 111 distributed on both sides of the air bag 112 along the first direction.

[0064] For example, in another embodiment, the packaging film 11 can form four accommodating cavities 111 and two air bags 112, that is, every two accommodating cavities 111 share one air bag 112. Specifically, with two accommodating cavities 111 and one air bag 112 as a group, the four accommodating cavities 111 and two air bags 112 can be divided into two groups, and the two accommodating cavities 111 in each group are distributed on both sides of a corresponding air bag 112 along the first direction.

[0065] For example, in yet another embodiment, the packaging film 11 may form two accommodating cavities 111 and one air bag 112 , that is, the two accommodating cavities 111 share one air bag 112 , and the two accommodating cavities 111 are distributed on both sides of the air bag 112 along the first direction.

[0066] The main function of the air bag 112 is to collect the gas from the accommodating cavity 111. These gases are mainly byproducts generated by the pole core 30 during the chemical formation process, such as hydrogen, oxygen, etc. By collecting these gases in the air bag 112, the accumulation of gas in the accommodating cavity 111 can be reduced, thereby reducing the risk of the packaging film 11 ruptured due to excessive internal pressure. Specifically, the air bag 112 can usually be designed as an independent cavity, and the volume of the air bag 112 can be designed according to the amount of gas released by the corresponding multiple pole cores 30, so that the air bag 112 can have enough space to accommodate the expansion of the gas without taking up too much material.

[0067] It can be understood that, based on the fact that each accommodating cavity 111 is provided with a pre-sealed area 12 on one side away from the air bag 112 along the first direction and at both ends along the second direction, the pre-sealed area 12 is used to partially seal the periphery of each accommodating cavity 111, so as to facilitate the subsequent complete sealing operation. Before being completely sealed, the pole core 30 is isolated from the outside world to a certain extent, and an unpackaged pressure relief side is reserved, so that the subsequent gas can only escape from the pressure relief side to the air bag 112. Specifically, the pre-sealing process can be performed in a heat-sealing manner, and the pre-sealed area 12 of the packaging film 11 is partially melted and bonded together by heating. Based on the fact that the accommodating cavity 111 has a second sealing area 13 on one side close to the air bag 112 along the first direction, the second sealing area 13 is the final sealing area performed after the pole core 30 completes the pre-sealing, liquid injection and formation processes, and the above-mentioned pressure relief side is finally sealed by the second sealing area 13. Specifically, the second sealing can also be performed in a heat-sealing manner, and the second sealing area 13 of the packaging film 11 is partially melted and bonded together by heating.

[0068] It should be noted that the first direction and the second direction are two orthogonal dimensions for describing the layout of the encapsulation structure 10. Specifically, the first direction and the second direction can be two orthogonal directions on a horizontal plane. In this embodiment, as Figure 1 , Figure 5 and Figure 6 show, the first direction can be the width direction of the electrode core 30, that is, the transverse direction, and the second direction can be the length direction of the electrode core 30, that is, the longitudinal direction.

[0069] In actual implementation, after respectively placing multiple electrode cores 30 into multiple accommodating cavities 111, a pre-sealing operation is performed on the encapsulation structure 10, that is, the pre-sealing area 12 of the packaging film 11 is pre-sealed, so that a top sealing edge, a bottom sealing edge, and an outer sealing edge are respectively formed on the top, bottom, and the outer side of each electrode core 30 facing away from the air bag 112. In this way, the inner side of each electrode core 30 close to the air bag 112 is reserved to form the above-mentioned pressure relief side for gas circulation. Then, processes such as liquid injection and formation are performed on the encapsulation structure 10. During the formation process, the gas generated by each electrode core 30 enters the corresponding air bag 112 through its respective pressure relief side for collection. Since multiple accommodating cavities 111 complete the collection through at least one air bag 112, in other words, each air bag 112 collects the gas generated by at least two electrode cores 30 during formation, enabling the gas generated by all electrode cores 30 during formation to be collected as concentrated as possible, reducing the number of air bags 112 used and reducing the waste of the aluminum-plastic film 20. When the formation process is completed, final sealing is performed through the second sealing area 13, and the encapsulation work of multiple electrode cores 30 is completed synchronously. Therefore, using this encapsulation structure 10 can realize the production of multiple battery cells at one time, improve production efficiency, and reduce production costs at the same time.

[0070] The encapsulation structure 10 provided by the embodiment of the present application, through the layout design of the above-mentioned multiple accommodating cavities 111 and at least one air bag 112, can realize the production of multiple battery cells in a single time. Compared with the traditional single-battery cell production method, it greatly improves production efficiency, shortens the production cycle, reduces the costs of labor and equipment, and at the same time realizes the sharing of one air bag 112 by multiple electrode cores 30, reduces the number of air bags 112 used, reduces the consumption of the aluminum-plastic film 20, thereby greatly reducing the material cost and further reducing the production cost.

[0071] In some embodiments, as Figure 1 , Figure 5 and Figure 6 show, two groups of accommodating cavities 111 located on both sides of the air bag 112 are arranged opposite to each other along the first direction.

[0072] As Figure 1 , Figure 5 and Figure 6As shown, from a top-down perspective, the encapsulation structure 10 can be regarded as a planar figure. The airbag 112 can be located at the central position of this planar figure in the first direction. In other words, the centerline of the airbag 112 in the second direction is parallel to the centerline of this planar figure in the second direction, while the accommodating cavities 111 on both sides are symmetrically distributed with respect to the centerline of the airbag 112 in the second direction, and the distances between the accommodating cavities 111 on both sides and the middle airbag 112 are equal. When there are multiple accommodating cavities 111 on either side of each airbag 112, any one of the accommodating cavities 111 on one side can maintain a facing position relationship with the corresponding accommodating cavity 111 on the other side.

[0073] In this embodiment, as Figure 1 、 Figure 5 and Figure 6 shown, two accommodating cavities 111 can be provided on either side of the airbag 112 in the first direction, and the two accommodating cavities 111 on one side and the two accommodating cavities 111 on the other side can be arranged opposite to each other one by one in the first direction.

[0074] In some other embodiments, one accommodating cavity 111 is provided on either side of the airbag 112 in the first direction, and the two accommodating cavities 111 on both sides can be arranged opposite to each other in the first direction.

[0075] For the encapsulation structure 10 provided by the embodiments of the present application, through the layout design in which the two groups of accommodating cavities 111 located on both sides of the airbag 112 are arranged opposite to each other one by one in the first direction, on the one hand, each accommodating cavity 111 receives the pressure and gas collection effect from the same direction of the airbag 112, which helps to maintain the stability and consistency of the electrode core 30 during the encapsulation process. On the other hand, this layout makes the distribution of gas in the airbag 112 more uniform, and the airbag 112 can collect the gas from the accommodating cavities 111 on both sides more effectively, improving the efficiency of gas collection.

[0076] In some embodiments, as Figure 1 、 Figure 5 and Figure 6 shown, the multiple accommodating cavities 111 located on either side of the airbag 112 are arranged at intervals in the second direction, and the two pre-sealing areas 12 between two adjacent accommodating cavities 111 in the second direction are distributed at intervals in the second direction.

[0077] As Figure 1 、 Figure 5 and Figure 6As shown, a plurality of receiving cavities 111 located on either side of the airbag 112 are arranged in a straight line along the second direction, and the plurality of receiving cavities 111 on the same side can be arranged opposite to each other. In other words, the centerlines of the plurality of receiving cavities 111 on the same side along the second direction are collinear. Combining the above, the two groups of receiving cavities 111 located on both sides of the airbag 112 are arranged opposite to each other one by one along the first direction. In this way, the plurality of receiving cavities 111 are arranged in an array, making the force on the encapsulation structure 10 more uniform in all directions, reducing the risk of structural damage caused by excessive local stress, and at the same time making the encapsulation structure 10 more symmetrical and regular, improving the accuracy and consistency of encapsulation, and further improving the encapsulation quality.

[0078] As Figure 5 shown, two pre-sealing areas 12 are distributed between two adjacent receiving cavities 111 along the second direction. After encapsulation, the two pre-sealing areas 12 respectively form the bottom sealing edges of the corresponding two pole cores 30. In actual design, the bottom sealing edges of two adjacent pole cores 30 are spaced apart by a certain distance, so as to reduce the mutual interference between two adjacent pole cores 30 during pre-sealing, and thus optimize the encapsulation effect of each pole core 30 as much as possible.

[0079] Among them, as Figure 5 shown, the distance h between the two pre-sealing areas 12 located between two adjacent receiving cavities 111 along the second direction can satisfy: h≥10mm.

[0080] Specifically, h can be 10mm, 12.5mm, 18.657mm, 25mm, 26.36mm, 30mm or other values greater than 10mm. In actual design, the requirements of encapsulation effect and material cost need to be considered, and the embodiments of the present application do not limit this.

[0081] For the encapsulation structure 10 provided by the embodiments of the present application, through the above layout design of the receiving cavities 111 and the pre-sealing areas 12, the force on the encapsulation structure 10 is more uniform in all directions, reducing the risk of structural damage caused by excessive local stress, and at the same time making the encapsulation structure 10 more symmetrical and regular, improving the accuracy and consistency of encapsulation, further improving the encapsulation quality, and reducing the mutual interference between two adjacent pole cores 30 during pre-sealing, so as to optimize the encapsulation effect of each pole core 30 as much as possible.

[0082] In some embodiments, as Figure 5 shown, the encapsulation structure 10 has an ear lead-out area 14 and a liquid injection area 15. The ear lead-out area 14 is connected to at least one end of the receiving cavity 111 along the second direction. At least one end of the airbag 112 along the second direction is provided with a liquid injection area 15, and the liquid injection area 15 is communicated with at least part of the receiving cavities 111 located on both sides of the airbag 112. Both sides of the liquid injection area 15 along the first direction are connected to the pre-sealing area 12, and the ear lead-out area 14 and the pre-sealing area 12 have an overlapping area.

[0083] It can be understood that the pole core 30 has a first pole ear 31 and a second pole ear 32 , the first pole ear 31 and the second pole ear 32 have opposite polarities, the first pole ear 31 and the second pole ear 32 can be led out on the same side or on different sides, and each pole ear lead-out area 14 is used to lead out the first pole ear 31 and / or the second pole ear 32 .

[0084] In this embodiment, if Figure 5 and Figure 6 As shown, the first pole lug 31 and the second pole lug 32 of each pole core 30 are both led out on the same side, that is, each accommodating cavity 111 matches a pole lug lead-out area 14, and the pole lug lead-out areas 14 matched by the two adjacent accommodating cavities 111 along the second direction are both arranged on the outside, that is, the first pole lug 31 and the second pole lug 32 of the two adjacent pole cores 30 are both led out to the ends away from each other. In this case, the distance between the two adjacent accommodating cavities 111 along the second direction can be minimized, minimizing the interference between the two adjacent pole cores 30.

[0085] In other embodiments, the first pole lug 31 and the second pole lug 32 of each pole core 30 are led out to opposite sides, that is, each accommodating cavity 111 matches the two pole lug lead-out areas 14 arranged on the opposite sides.

[0086] like Figure 5 As shown, both sides of the injection area 15 along the first direction are connected to the pre-sealing area 12, that is, the pre-sealing area 12 avoids the injection area 15. In other words, after the pre-sealing area 12 is packaged, the injection area 15 can form an injection port for subsequent injection operations. Based on the overlapping area between the tab lead-out area 14 and the pre-sealing area 12, in this way, during the pre-sealing process, the pole core 30 is first placed in the accommodating cavity 111, and after the first tab 31 and the second tab 32 extend out of the packaging film 11 from at least one tab lead-out area 14, the pre-sealing area 12 begins to be hot-pressed and pre-sealed. After the pre-sealing is completed, while the top edge, bottom edge and outer edge are formed around the pole core 30, the part of the packaging film 11 corresponding to the overlapping area between the tab lead-out area 14 and the pre-sealing area 12 is fused with the self-adhesive on the first tab 31 and / or the second tab 32, so that the overlapping area is sealed, and the original tab lead-out area 14 disappears to prevent leakage there. Both sides of the liquid injection area 15 along the first direction can also be closed accordingly to form a liquid injection port, and the liquid injection device can complete the liquid injection by extending the liquid injection nozzle from the liquid injection port into the accommodating cavity 111.

[0087] In this embodiment, if Figure 5 As shown, the packaging film 11 forms four accommodating cavities 111 , and both ends of the air bag 112 along the second direction have injection areas 15 , one injection area 15 is connected to two of the accommodating cavities 111 , and the other injection area 15 is connected to the other two accommodating cavities 111 .

[0088] In some other embodiments, the packaging film 11 forms two accommodating cavities 111, and either end of the airbag 112 along the second direction may have a liquid injection area 15, which communicates with the two accommodating cavities 111.

[0089] In actual implementation, taking Figure 5 as an example, the packaging film 11 may form four accommodating cavities 111 and one airbag 112. Specifically, two accommodating cavities 111 may be provided on either side of the airbag 112 along the first direction, forming two pairs of accommodating cavities 111 distributed on both sides of the airbag 112 along the first direction. According to the number of liquid injection nozzles of the on-site liquid injection equipment, the four accommodating cavities 111 are injected with liquid. For example, when the liquid injection equipment has four liquid injection nozzles, the four accommodating cavities 111 can be injected with liquid simultaneously; or, when the liquid injection equipment has two liquid injection nozzles, two of the accommodating cavities 111 connected to the same liquid injection port can be injected with liquid first, and then the other two accommodating cavities 111 connected to the same liquid injection port can be injected with liquid; or, when the liquid injection equipment has only one liquid injection nozzle, the four accommodating cavities 111 can be injected with liquid in sequence. In the actual production process, in the path where the liquid injection nozzle extends from the liquid injection port into the accommodating cavity 111, it can bypass the airbag 112 or pass through the airbag 112, depending on the actual distribution of the airbag 112, and the present application does not limit this.

[0090] It should be noted that as Figure 5 shown, in actual design, the distances between the liquid injection ports and the corresponding two accommodating cavities 111 are equal to achieve a stable and uniform liquid injection effect for each electrode core 30.

[0091] The encapsulation structure 10 provided by the embodiments of the present application, through the layout design of the above-mentioned pre-sealing area 12, ear lead-out area 14 and liquid injection area 15, synchronously seals between the ear and the encapsulation structure 10 during the pre-sealing process, without affecting the subsequent liquid injection process, maintaining the smooth progress of the encapsulation process, and the design that the liquid injection area 15 communicates with multiple accommodating cavities 111 reduces the number of liquid injection ports that need to be reserved compared with the design where each accommodating cavity 111 is matched with a liquid injection area 15, thereby significantly reducing the encapsulation difficulty, simplifying the encapsulation steps, and further greatly accelerating the encapsulation efficiency.

[0092] In some embodiments, as Figure 2 、 Figure 3 and Figure 5 shown, the packaging film 11 includes two film sheets 113 stacked vertically, and an accommodating cavity 111 and an airbag 112 are formed between the two film sheets 113, and both of the two film sheets 113 have a pre-sealing area 12, a second-sealing area 13, an ear lead-out area 14 and a liquid injection area 15.

[0093] In actual implementation, multiple pits can be processed on each diaphragm 113. When two diaphragms 113 are stacked and bonded vertically, the multiple pits are joined or closed to form multiple accommodation cavities 111 and at least one air bag 112. The pre-sealing area 12, secondary sealing area 13, tab lead-out area 14, and liquid injection area 15 on each diaphragm 113 can be marked in advance by physical means, or the encapsulation device can be positioned and calibrated in advance. When two diaphragms 113 are stacked and bonded vertically, the pre-sealing area 12, secondary sealing area 13, tab lead-out area 14, and liquid injection area 15 on the two diaphragms 113 coincide one by one. During the lamination process, methods such as vacuum adsorption and positioning pins can be used to ensure that there are no air bubbles, wrinkles, or misalignments between the two diaphragms 113, improving the accuracy and quality of lamination.

[0094] It should be noted that in this embodiment, the vertical direction is perpendicular to the horizontal plane. In other words, the vertical direction is perpendicular to both the first direction and the second direction.

[0095] The encapsulation structure 10 provided by the embodiment of the present application forms the encapsulation structure 10 by laminating the two diaphragms 113 as described above, providing a structural basis for the formation of the accommodation cavities 111 and the air bags 112. At the same time, the clear functional area division can simplify the encapsulation process, reduce operation errors and repetitive operations, thereby improving the encapsulation efficiency.

[0096] In some embodiments, such as Figure 2 、 Figure 3 and Figure 5 shown, the packaging film 11 further includes a folding section 114 connecting the two diaphragms 113. The folding section 114 is provided with a first avoidance opening 1141 and a second avoidance opening 1142 penetrating along the second direction. The tab lead-out area 14 close to the folding section 114 is arranged opposite to the first avoidance opening 1141 along the second direction, and the liquid injection area 15 close to the folding section 114 is arranged opposite to the second avoidance opening 1142 along the second direction.

[0097] In this embodiment, as Figure 2 shown, the folding section 114 can be curved. Specifically, the cross-section of the folding section 114 can be circular arc-shaped.

[0098] In other embodiments, such as Figure 2 shown, the folding section 114 can be straight. Specifically, the cross-section of the folding section 114 can be linear.

[0099] It can be understood that when at least some of the multiple electrode cores 30 have the first tab 31 and / or the second tab 32 led out towards the folding section 114, the folding section 114 needs to be provided with a first avoidance opening 1141 to allow the corresponding first tab 31 or second tab 32 to pass through smoothly. When the encapsulation structure 10 is provided with a liquid injection area 15 at the edge close to the folding section 114, the folding section 114 needs to be provided with a second avoidance opening 1142 to allow the liquid injection nozzle to pass through smoothly.

[0100] Among them, the shape and size of the first avoidance opening 1141 and the second avoidance opening 1142 can be customized according to actual needs, and the present application does not limit this.

[0101] The encapsulation structure 10 provided by the embodiment of the present application, through the structural design of the above-mentioned packaging film 11 composed of two film sheets 113 and the folding section 114, simplifies the preparation process of the encapsulation structure 10, reduces the preparation difficulty, thereby improving the production efficiency. At the same time, by providing the first avoidance opening 1141 and the second avoidance opening 1142 on the folding section 114, a smooth channel is provided for the tab to be led out, enabling the liquid injection nozzle to pass through the second avoidance opening 1142 for liquid injection operation, facilitating the injection of the electrolyte, providing a structural basis for producing multiple battery cells in a single production, and increasing the use width of the encapsulation structure 10.

[0102] The present application also provides a battery production line.

[0103] In some embodiments, the battery production line includes: an aluminum plastic film processing device and an encapsulation device.

[0104] The aluminum plastic film processing device is used to prepare the encapsulation structure 10 according to any of the above solutions; the encapsulation device includes a pre-sealing mechanism and a secondary sealing mechanism. The pre-sealing mechanism is used to thermally press the pre-sealing area 12 of the encapsulation structure 10, and the secondary sealing mechanism is used to thermally press the secondary sealing area 13 of the encapsulation structure 10.

[0105] In actual implementation, the aluminum-plastic film processing device can perform operations such as stamping and folding on the aluminum-plastic film 20 to prepare the above-mentioned packaging structure 10. During this process, the loading operation of multiple electrode cores 30 can be completed. For the packaging structure 10 loaded with multiple electrode cores 30, it can be transported to the packaging device. The pre-sealing mechanism can hot-press the pre-sealing area 12 of the two film pieces 113. The pre-sealing area 12 of the two film pieces 113 is fused together under the combined action of a certain temperature, pressure, and time, so that top sealing edges, bottom sealing edges, and outer sealing edges are respectively formed at the top, bottom, and outer side of each electrode core 30 facing away from the air bag 112. After processes such as liquid injection and formation, the second-sealing mechanism can hot-press the second-sealing area 13 of the two film pieces 113. The second-sealing area 13 of the two film pieces 113 is fused together under the combined action of a certain temperature, pressure, and time, so that inner sealing edges are formed on the inner side of each electrode core 30 close to the air bag 112, thereby realizing the complete isolation of the electrode core 30 from the external environment.

[0106] The battery production line provided by the embodiment of the present application, through the automated design of the above-mentioned aluminum-plastic film processing device and packaging device, reduces the time and labor intensity of manual operation, realizes the rapid preparation and packaging of the packaging structure 10, and at the same time provides equipment support for producing multiple battery cores at a single time, greatly shortening the production cycle, increasing the output per unit time, and thus improving the production efficiency of the entire battery production line.

[0107] In some embodiments, as Figure 5 and Figures 7 - 10 shown, the pre-sealing mechanism includes pre-sealing heads 40 arranged in pairs and used for clamping the packaging structure 10, and the second-sealing mechanism includes second-sealing heads 50 arranged in pairs and used for clamping the packaging structure 10; wherein, the pre-sealing head 40 forms an opening 41 penetrating along the second direction, and the opening 41 is used to avoid the liquid injection area 15 of the packaging structure 10. The lower surface of the upper pre-sealing head 40 and the upper surface of the lower pre-sealing head 40 are both provided with grooves 42, and the bottom wall of the groove 42 is suitable for pressing on the ear lead-out area 14 of the packaging structure 10.

[0108] In other words, when the pre-sealing head 40 hot-presses the pre-sealing area 12 of the packaging structure 10, the vertical projection of the opening 41 coincides with the liquid injection area 15, and the vertical projection of the groove 42 coincides with the ear lead-out area 14.

[0109] Among them, the width difference between the groove 42 and the corresponding ear can be 2.5 mm to 3.5 mm; the depth of the groove 42 can be 150 μm to 170 μm.

[0110] Specifically, the width difference between the groove 42 and the corresponding tab can be 2.5 mm, 2.74 mm, 3 mm, 3.358 mm, 3.5 mm, or other values between 2.5 mm and 3.5 mm; the depth of the groove 42 can be 150 μm, 155 μm, 160 μm, 166.7 μm, 170 μm, or other values between 150 μm and 170 μm, and there is no limitation here.

[0111] The shape and size of the opening 41 can be customized according to actual needs, and this application does not limit this.

[0112] In actual implementation, the encapsulation structure 10 is placed on the workbench of the pre-sealing mechanism. The two pre-sealing heads 40 clamp the packaging film 11 of the encapsulation structure 10 under the drive of the fixture. When the pre-sealing operation is started, the heating element of the pre-sealing mechanism heats the pre-sealing area 12 and applies a certain pressure to make the pre-sealing area 12 achieve a high-strength sealing effect. Due to the existence of the opening 41 and the groove 42, during the process of hot-pressing the pre-sealing area 12, the liquid injection area 15 will not be covered by the pre-sealing head 40. Therefore, after the pre-sealing area 12 is encapsulated, both sides of the liquid injection area 15 in the first direction can be correspondingly closed to form a liquid injection port. The tab passes through the tab lead-out area 14 before heat sealing, and the pre-sealing head 40 will cover the tab lead-out area 14 during heat sealing. Specifically, the groove 42 is set to match the thickness of the tab stacked with the aluminum-plastic film 20, that is, during hot pressing, part of the upper film 113 and part of the tab are accommodated in this groove, and the bottom wall of the groove 42 appropriately presses the tab and the encapsulation structure 10 here. In this way, the tab can also be heat-sealed accordingly, so that the sealing effect at the tab reaches the expectation while not causing excessive damage to the tab. After the encapsulation structure 10 completes processes such as pre-sealing, liquid injection, and formation, the encapsulation structure 10 is placed on the workbench of the second-sealing mechanism. The two second-sealing heads 50 clamp the packaging film 11 of the encapsulation structure 10 under the drive of the fixture. When the second-sealing operation is started, the heating element of the second-sealing mechanism heats the second-sealing area 13 and applies a certain pressure to make the second-sealing area 13 achieve a high-strength sealing effect.

[0113] The battery production line provided by the embodiment of the present application, by providing the opening 41 and the groove 42 on the pre-sealing head 40 as described above, effectively protects the liquid injection area 15, helps the liquid injection area 15 to smoothly form a liquid injection port after pre-sealing, enables the battery core to be normally injected with liquid in the subsequent processes, and at the same time, the groove 42 can match the thickness of the stacked aluminum-plastic film 20 of the tab, realizing the sealing at the tab without damaging the tab, maximizing the packaging effect at the tab, reducing the risk of liquid leakage at the tab of the battery core, thereby improving the performance and safety of the battery. Moreover, the pre-sealing head 40 and the second-sealing head 50 are provided in pairs and can provide stable and uniform pressure, optimizing the packaging effect. At the same time, by adjusting the structures of the pre-sealing head 40 and the second-sealing head 50, the battery production line can adapt to different sizes and specifications of packaging requirements.

[0114] In some embodiments, the battery production line further includes: a loading device and a slitting device.

[0115] The loading device is used to load a plurality of battery cores 30 to the corresponding positions of the aluminum-plastic film 20; the slitting device is used to divide the packaged plurality of battery cores.

[0116] The loading device can adopt equipment such as an automated robotic arm, a vibrating bowl, or a precision conveyor belt, and the slitting device can adopt equipment such as a blade, a laser cutter, or a water cutter, which is not limited here.

[0117] In actual execution, the loading device can transport the grasped battery core 30 from the storage area to the aluminum-plastic film processing device. When the battery core 30 reaches above the aluminum-plastic film 20, according to the preset coordinates and angles, the battery core 30 is accurately placed into the accommodation cavity 111 to maintain the smooth progress of the subsequent packaging operation. After the packaging structure 10 completes the packaging operation, the packaged plurality of battery cores are transported to the slitting device. The slitting device can start the cutting operation according to the preset slitting path and size, and separately slit out the plurality of battery cores with the outer shells connected as a whole.

[0118] The battery production line provided by the embodiment of the present application, through the above settings of the loading device and the slitting device, the loading device can accurately place the battery core 30 at the corresponding position of the aluminum-plastic film 20, reducing the packaging defects caused by inaccurate positions. The slitting device can accurately divide the battery cores, reducing the defective rate caused by inaccurate slitting, thereby improving the product quality. At the same time, the battery production line can achieve automated and continuous production, significantly improving the production efficiency, and reducing manual intervention and waiting time.

[0119] The present application also provides a battery production method, which is applied to the battery production line in any of the above solutions.

[0120] In some embodiments, such as Figure 12As shown, the battery production method includes: step 610, step 620, and step 630.

[0121] Step 610: Control the aluminum-plastic film processing device to punch the aluminum-plastic film 20 to form a plurality of first pits 21 and at least one second pit 22 on the aluminum-plastic film 20.

[0122] According to the size, shape, and quantity of the required accommodation cavity 111 and airbag 112, precisely set the punching parameters of the aluminum-plastic film processing device. These parameters may include, but are not limited to, the shape and size of the punch, the depth of the pit, the spacing between the pits, and the arrangement pattern of the pits, etc. During the punching process, use a high-precision punching die. By controlling the movement trajectory and force of the punching die, form a plurality of first pits 21 and at least one second pit 22 on the aluminum-plastic film 20. Specifically, the first pits 21 are used to form the accommodation cavity 111 of the encapsulation structure 10, and the second pits 22 are used to form the airbag 112 of the encapsulation structure 10.

[0123] Step 620: Control the feeding device to place a plurality of electrode cores 30 into some of the first pits 21.

[0124] The feeding device can grasp a plurality of electrode cores 30 and place them in sequence at one time, or it can grasp one electrode core 30 at a time. This application does not make any limitations in this regard.

[0125] It can be understood that, as Figure 4 shown, taking the folding line shown in the figure as the demarcation line, the entire aluminum-plastic film 20 is divided into two parts. Each part is provided with a plurality of first pits 21. The number of first pits 21 on the two parts is equal. At least one of the two parts is provided with a second pit 22. The feeding device can transport a plurality of electrode cores 30 to the first pits 21 of one of the parts.

[0126] Step 630: Control the aluminum-plastic film processing device to fold the aluminum-plastic film 20 along the folding line, so that a plurality of first pits 21 form a plurality of accommodation cavities 111, and at least one second pit 22 forms at least one airbag 112, obtaining the encapsulation structure 10.

[0127] In actual execution, as Figure 4 and Figure 5 shown, according to the predetermined folding line, the folding line is usually the midline of the aluminum-plastic film 20, that is, control the aluminum-plastic film processing device to perform a folding operation on the aluminum-plastic film 20, so that the aforementioned two layers of film pieces 113 can be accurately aligned, minimizing the occurrence of wrinkles, misalignment, or deviation. After folding, a plurality of first pits 21 form a plurality of accommodation cavities 111, and at least one second pit 22 forms at least one airbag 112, obtaining a preliminary encapsulation structure 10.

[0128] Among them, the accommodation cavity 111 can be formed in the following manner:

[0129] Taking the folding line shown in the figure as the dividing line, the entire aluminum-plastic film 20 is divided into two parts, and each part is provided with a plurality of first pits 21. The number of first pits 21 on each part is equal to the number of accommodating cavities 111. In this way, after folding, a plurality of first pits 21 are covered with each other in pairs to form a plurality of accommodating cavities 111.

[0130] The air bag 112 can be at least one of the following structural forms:

[0131] One is Figure 4 Taking the folding line shown in the figure as the dividing line, the entire aluminum-plastic film 20 is divided into two parts. One part forms a second pit 22, and after folding, the other part seals the opening of the second pit 22, thereby forming the air bag 112.

[0132] The other is Figure 4 Taking the folding line shown in the figure as the dividing line, the entire aluminum-plastic film 20 is divided into two parts, and each part is provided with at least one second pit 22. The number of second pits 22 on each part is equal to the number of air bags 112. In this way, after folding, a plurality of second pits 22 are covered with each other in pairs to form at least one air bag 112.

[0133] The battery production method provided by the embodiment of the present application, through the design of the preparation process of the above-mentioned packaging structure 10, the automatic pit punching and folding operations of the aluminum-plastic film processing device, and the efficient feeding of the feeding device, reduces the time and complexity of manual operations, realizes rapid pit punching, feeding and the formation of the packaging structure 10, the continuous operation and automatic control of each process, greatly shortens the production cycle, improves the output per unit time of the entire battery production line, and at the same time realizes the processing and forming of a plurality of accommodating cavities 111 and at least one air bag 112, providing a preliminary structural basis for producing multiple battery cores at one time and sharing one air bag 112 by multiple electrode cores 30 in the formation process.

[0134] In some embodiments, as shown in Figure 5 and Figure 6 , after step 630, controlling the aluminum-plastic film processing device to fold the aluminum-plastic film 20 along the folding line, so that a plurality of first pits 21 form a plurality of accommodating cavities 111, and at least one second pit 22 forms at least one air bag 112 to obtain the packaging structure 10, it further includes:

[0135] Controlling the pre-sealing mechanism of the packaging device to thermally press the pre-sealing area 12 of the packaging structure 10, so that the liquid injection area 15 of the packaging structure 10 forms a liquid injection port, and leaving an unsealed side between each accommodating cavity 111 and the air bag 112;

[0136] Injecting electrolyte into each accommodating cavity 111 through the liquid injection port and the unsealed side;

[0137] Perform formation operations on the electrode cores 30 in each accommodation cavity 111, and collect the gases generated by the electrode cores 30 from the unsealed side through the air bag 112;

[0138] Control the second sealing mechanism of the encapsulation device to thermally press and encapsulate the second sealing area 13 of the encapsulation structure 10, and encapsulate the unsealed side;

[0139] Control the slitting device to cut the encapsulation structure 10 along the separation line, so that the encapsulated battery cells are separated.

[0140] Among them, the effective sealing width of the pre-sealing area 12 can be 2 mm to 3 mm, and the effective sealing width of the second sealing area 13 can be 2 mm to 3 mm.

[0141] Specifically, the effective sealing width of the pre-sealing area 12 can be 2 mm, 2.25 mm, 2.5 mm, 2.736 mm, 3 mm or other values between 2 mm and 3 mm, and the effective sealing width of the second sealing area 13 can be 2 mm, 2.25 mm, 2.5 mm, 2.736 mm, 3 mm or other values between 2 mm and 3 mm, which are not limited here.

[0142] It should be noted that the unsealed side left between each accommodation cavity 111 and the air bag 112 after pre-sealing is the aforementioned pressure relief side, and the unsealed side can serve as a gas channel between the accommodation cavity 111 and the air bag 112. The separation line can be the cutting movement track line of the slitting device, and the distribution position of the separation line can include but is not limited to between the ends of two adjacent electrode cores 30 along the second direction, between each electrode core 30 and the air bag 112, or other positions.

[0143] Exemplarily, taking Figure 6 as an example, the packaging film 11 can form four accommodation cavities 111 and one air bag 112, that is, four accommodation cavities 111 share one air bag 112. This encapsulation structure 10 can be designed with three separation lines, namely a separation line extending along the first direction and two separation lines extending along the second direction. Among them, the separation line extending along the first direction can be located at the midline between two pre-sealing areas 12 between two adjacent accommodation cavities 111 along the second direction, that is, the midline between two adjacent bottom sealing edges, and the separation line extending along the second direction can be the midline between the air bag 112 and the second sealing area 13, that is, the midline between the air bag 112 and the inner sealing edge.

[0144] The battery production method provided by the embodiments of the present application, through the above design of pre-sealing, liquid injection, formation, second sealing, and slitting operations, matches the self-structure of the encapsulation structure 10, further optimizes the production process of multiple battery cells at one time, reduces the repeated processes, improves the production efficiency of multiple battery cells at one time, and at the same time uses the staged encapsulation design of pre-sealing and second sealing to provide encapsulation support for the realization of multiple electrode cores 30 sharing one air bag 112.

[0145] In some embodiments, as Figures 2 - 4 shown, when the packaging film 11 of the encapsulation structure 10 is provided with a first avoidance opening 1141 and a second avoidance opening 1142, after step 610 of controlling the aluminum-plastic film processing device to punch the aluminum-plastic film 20 to form a plurality of first pits 21 and at least one second pit 22 on the aluminum-plastic film 20, it further includes:

[0146] Controlling the aluminum-plastic film processing device to cut out a plurality of reserved openings 23 at the folding line of the aluminum-plastic film 20, so that after the aluminum-plastic film 20 is folded, the plurality of reserved openings 23 form the first avoidance opening 1141 and the second avoidance opening 1142.

[0147] In actual implementation, as Figures 2 - 4 shown, considering the situation that the edge of the encapsulation structure 10 near the folding section 114 has an ear extraction area 14 and a liquid injection area 15, in order not to affect the ear extraction and normal liquid injection, during the preparation process of the encapsulation structure 10, after the punching operation is completed, according to the design requirements and the position of the folding line, control the aluminum-plastic film processing device to perform a cutting operation at the folding line to cut out a plurality of reserved openings 23. The positions, shapes and sizes of these reserved openings 23 need to be accurately set according to the design of the first avoidance opening 1141 and the second avoidance opening 1142. According to the predetermined folding line, use the aluminum-plastic film processing device to fold the aluminum-plastic film 20. After folding, the plurality of reserved openings 23 can accurately form the first avoidance opening 1141 and the second avoidance opening 1142 on the folding section 114, so that the first avoidance opening 1141 and the second avoidance opening 1142 respectively correspond to the ear extraction area 14 and the liquid injection area 15, providing a smooth channel for the ear extraction and liquid injection operations.

[0148] The battery production method provided by the embodiments of the present application improves the formation quality of the first avoidance opening 1141 and the second avoidance opening 1142 through the reasonable cutting design of the above-mentioned reserved openings 23. When the edge of the encapsulation structure 10 near the folding section 114 has an ear extraction area 14 and a liquid injection area 15, it enables the reserved openings 23 to be well adapted to the positions and sizes of the ear extraction area 14 and the liquid injection area 15 after folding, realizes the normal extraction of the ears and the smooth progress of the subsequent liquid injection process, enables the production method to adapt to the requirements of different encapsulation structures 10, and expands the applicable range of the battery production line.

[0149] The terms "first", "second", etc. in the description and claims of this application are used to distinguish similar objects, rather than to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of this application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are usually of the same type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the description and claims means at least one of the connected objects, and the character " / " generally means that the associated objects before and after are in an "or" relationship.

[0150] In the description of this application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0151] In the description of this application, the "first feature", "second feature" may include one or more of such features.

[0152] In the description of this application, the meaning of "a plurality" is two or more.

[0153] In the description of this application, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through additional features therebetween.

[0154] In the description of this application, the first feature being "above", "over" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature.

[0155] Other configurations of... according to the embodiments of this application, such as... and... etc., as well as operations, are known to those of ordinary skill in the art and will not be described in detail here.

[0156] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0157] Although the embodiments of the present application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and purposes of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. An encapsulation structure, characterized in that, include: A packaging film is provided to form a plurality of accommodating cavities for accommodating the pole core and at least one air bag for collecting gas from the accommodating cavities, wherein the plurality of accommodating cavities are distributed on both sides of the air bag along a first direction, the accommodating cavity has a pre-sealed area on the side away from the air bag along the first direction and on both ends along a second direction, and the accommodating cavity has a second sealed area on the side close to the air bag along the first direction, wherein the first direction and the second direction intersect.

2. The encapsulation structure according to claim 1, wherein The two groups of accommodating cavities located on both sides of the air bag are arranged opposite to each other along the first direction.

3. The encapsulation structure according to claim 1, characterized in that, The plurality of accommodating cavities located on either side of the air bag are arranged relatively to each other along the second direction, and the two pre-sealed areas located between two adjacent accommodating cavities along the second direction are spaced apart and distributed along the second direction.

4. The encapsulation structure according to any one of claims 1-3, characterized in that, The packaging structure has a tab lead-out area and a liquid injection area, the tab lead-out area is connected to at least one end of the accommodating cavity along the second direction, the liquid injection area is provided at at least one end of the air bag along the second direction, and the liquid injection area is connected to at least part of the accommodating cavity located on both sides of the air bag, both sides of the liquid injection area along the first direction are connected to the pre-sealed area, and the tab lead-out area and the pre-sealed area have an overlapping area.

5. The encapsulation structure according to claim 4, wherein The packaging film comprises two layers of film sheets stacked vertically, the accommodating cavity and the air bag are formed between the two layers of film sheets, and both the two layers of film sheets have the pre-sealing area, the second sealing area, the tab lead-out area and the liquid injection area.

6. The encapsulation structure according to claim 5, wherein The packaging film also includes a folding section connecting the two layers of film, the folding section is provided with a first avoidance opening and a second avoidance opening penetrating along the second direction, the tab lead-out area close to the folding section is arranged opposite to the first avoidance opening along the second direction, and the liquid injection area close to the folding section is arranged opposite to the second avoidance opening along the second direction.

7. A battery production line, characterized in that, include: An aluminum-plastic film processing device for preparing a packaging structure as claimed in any one of claims 1 to 6; The packaging device comprises a pre-sealing mechanism and a secondary sealing mechanism, wherein the pre-sealing mechanism is used for hot pressing the pre-sealing area of ​​the packaging structure, and the secondary sealing mechanism is used for hot pressing the secondary sealing area of ​​the packaging structure.

8. The battery production line according to claim 7, characterized in that, The pre-sealing mechanism includes pre-sealing heads arranged in pairs and used to clamp the packaging structure, and the double-sealing mechanism includes double-sealing heads arranged in pairs and used to clamp the packaging structure; wherein, the pre-sealing head forms an opening that passes through along the second direction, and the opening is used to avoid the liquid injection area of ​​the packaging structure, and the lower surface of the pre-sealing head located above and the upper surface of the pre-sealing head located below are both provided with grooves, and the bottom wall of the groove is suitable for pressing the tab lead-out area of ​​the packaging structure.

9. The battery production line according to claim 7, wherein, Also includes: A feeding device, used to feed multiple pole cores to corresponding positions of the aluminum-plastic film; The cutting device is used to separate multiple battery cells after packaging.

10. A battery production method, applied to the battery production line as described in any one of claims 7-9, characterized in that, include: Controlling the aluminum-plastic film processing device to punch the aluminum-plastic film, so that a plurality of first pits and at least one second pit are formed on the aluminum-plastic film; Controlling the loading device to place a plurality of pole cores into some of the first pits; Control the aluminum-plastic film processing device to fold the aluminum-plastic film along the folding line, so that the multiple first pits form multiple accommodating cavities, and the at least one second pit forms at least one air bag, obtaining a packaging structure.

11. The battery production method according to claim 10, wherein, After controlling the aluminum-plastic film processing device to fold the aluminum-plastic film along the folding line, so that the multiple first pits form multiple accommodating cavities, and the at least one second pit forms at least one air bag, obtaining a packaging structure, it further includes: Control the pre-sealing mechanism of the packaging device to hot-press the pre-sealing area of the packaging structure, so that the liquid injection area of the packaging structure forms a liquid injection port, and leave an unsealed side between each of the accommodating cavities and the air bag; Inject electrolyte into each of the accommodating cavities through the liquid injection port and the unsealed side; Perform a forming operation on the electrode cores in each of the accommodating cavities, and collect the gas generated by the electrode cores from the unsealed side through the air bag; Control the second-sealing mechanism of the packaging device to hot-press the second-sealing area of the packaging structure and seal the unsealed side; Control the slitting device to cut the packaging structure along the separation line, so that each of the battery cells after packaging is separated.

12. The battery production method according to claim 10, characterized in that, When the packaging film of the packaging structure is provided with a first avoidance opening and a second avoidance opening, after controlling the aluminum-plastic film processing device to punch pits in the aluminum-plastic film so that multiple first pits and at least one second pit are formed on the aluminum-plastic film, it further includes: Control the aluminum-plastic film processing device to cut out multiple reserved openings at the folding line of the aluminum-plastic film, so that the multiple reserved openings form the first avoidance opening and the second avoidance opening after the aluminum-plastic film is folded.

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