Battery packaging structure
The battery packaging structure addresses gas storage and electrolyte retention by incorporating a gas pocket and flow channel, enhancing compatibility and reducing costs through efficient gas management and electrolyte recycling.
Patent Information
- Application Number
- CN202422081812.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-24
- Publication Date
- 2025-07-15
- Estimated Expiration
- 2034-08-24
AI Technical Summary
The gas storage capacity of the traditional soft-pack battery packaging film is insufficient, resulting in gas accumulation in the melting process, increasing material and mold costs, and the electrolyte residue affects the battery cell infiltration and increases electrolyte consumption.
An air pit is provided in the air bag of the packaging film, and a flow guide groove is provided between the storage bag and the gas pit. The flow guide groove is connected to the storage bag and the gas pit. When the gas is generated during the transformation process, the gas pit accommodates gas, and the electrolyte is returned to the storage bag through the drainage tank, saving electrolyte consumption.
It solves the problems of mold incompatibility and increased material costs caused by gas accumulation, reduces electrolyte consumption and production costs, and improves mold compatibility and battery cell wetting effect.
Smart Images
Figure CN223109002U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of batteries, and particularly to a battery packaging structure. Background Art
[0002] During the production process of soft-pack batteries, before the formation process of the soft-pack batteries, the battery cells need to be placed in a packaging film with an airbag, then the electrolyte is injected into the packaging film, and then the packaging bag is transferred to the formation process. However, the airbag of the traditional packaging film has a small gas storage capacity. When the amount of gas generated during the formation process is large, it is necessary to extend the length of the airbag to accommodate more gas, or punch air pits in the airbag to increase the gas storage capacity.
[0003] Among them, the method of extending the length of the airbag requires an increase in the material cost of the packaging film, which is not friendly to the material cost. Moreover, the packaging film with the extended airbag is not compatible with other molds, increasing the mold cost, resulting in poor mold versatility and increased management difficulty.
[0004] The method of punching air pits in the airbag is likely to cause some electrolyte to remain in the small pits due to the encapsulation negative pressure, and the electrolyte cannot flow smoothly into the accommodation bag where the battery cell is located, affecting the infiltration of the battery cell body. In order to ensure that the battery cell is sufficiently infiltrated, it is only possible to increase the injected electrolyte before the formation process, resulting in an increase in the consumption of the electrolyte and an increase in the material cost. Summary of the Utility Model
[0005] To solve or partially solve the problems existing in the related technologies, this application provides a battery packaging structure, which can save the consumption of the electrolyte and reduce the production cost.
[0006] In the first aspect of this application, a battery packaging structure is provided, including a packaging film. The packaging film includes an accommodation bag and an airbag. The accommodation bag is used to place the battery cell, and the airbag is located on one side of the accommodation bag. An air pit for accommodating gas is provided in the airbag. A diversion groove is recessed between the accommodation bag and the air pit on the packaging film, and the diversion groove is respectively communicated with the accommodation bag and the air pit.
[0007] Further, there are at least two diversion grooves. Each accommodation bag is at least communicated with two diversion grooves, and each air pit is at least communicated with two diversion grooves.
[0008] Further, there are at least two air pits. Each accommodation bag is respectively communicated with at least two air pits through the diversion groove.
[0009] Further, the diversion groove is in a long strip shape.
[0010] Further, the air pit includes a diversion part and a main body part. The diversion part is funnel-shaped. The wide opening of the diversion part communicates with the main body part, and the narrow opening of the diversion part communicates with the diversion groove.
[0011] Further, the length of the main body part is greater than the length of the diversion part, and the length of the main body part is less than the length of the accommodation bag.
[0012] Further, the length of the diversion groove is greater than the length of the diversion part.
[0013] Further, the battery packaging structure further includes a first sealing edge and a side sealing edge. The side sealing edge is located on the side of the accommodation bag away from the air bag. The first sealing edge is connected to the side sealing edge. The first sealing edge is located on one side of the air bag and the accommodation bag, and the first sealing edge and the side sealing edge form a 90-degree angle.
[0014] Further, the depth of the air pit is less than the depth of the accommodation bag.
[0015] Further, the packaging film is made of an aluminum-plastic film.
[0016] The technical solution provided by this application may include the following beneficial effects: By providing an air pit in the air bag in this application, during the formation process of the soft-pack battery, the air pit can accommodate more gas, solving the problem of large gas generation during the formation process resulting in deformation of the second seal, and there is no need to lengthen the air bag, saving the use cost of the packaging film; By providing a diversion groove between the accommodation bag and the air pit, after the accommodation bag is evacuated, the electrolyte in the air pit can flow back into the accommodation bag along the diversion groove, thus saving the consumption of the electrolyte and reducing the production cost.
[0017] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit this application. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] By describing the exemplary embodiments of the present application in more detail in conjunction with the drawings, the above and other objects, features, and advantages of the present application will become more obvious. Among them, in the exemplary embodiments of the present application, the same reference numerals generally represent the same components.
[0019] Figure 1 is an expanded structural schematic diagram of the battery packaging structure shown in the embodiment of the present application;
[0020] Figure 2 is a side view of the battery packaging structure shown in the embodiment of the present application.
[0021] Reference numerals: accommodating bag 1; air bag 2; air pit 21; diversion part 211; main body part 212; diversion groove 3; first sealing edge 4; side sealing edge 5; second sealing edge 6; third sealing edge 7; folding line 8. Detailed implementation manners
[0022] The embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the embodiments of the present application are shown in the drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.
[0023] It should be understood that although the terms "first", "second", "third", etc. may be used in the present application to describe various information, such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality" means two or more unless otherwise specifically defined.
[0024] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "length", "width", "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 the present 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 thus should not be construed as a limitation of the present application.
[0025] Unless otherwise clearly defined and limited, the terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.
[0026] In view of the above problems, the embodiment of the present application provides a battery packaging structure, which can save the consumption of electrolyte and reduce the production cost.
[0027] The technical solutions of the embodiments of the present application will be described in detail below with reference to the accompanying drawings.
[0028] Figure 1 It is a schematic diagram of the unfolded structure of the battery packaging structure shown in the embodiments of the present application.
[0029] Refer to Figure 1 , the battery packaging structure includes a packaging film, which is made of an aluminum-plastic film. The packaging film includes a containing bag 1 and an air bag 2. The containing bag 1 is recessed outward from the packaging film, and the shape of the containing bag 1 matches the shape of the battery cell. The containing bag 1 is used to place the battery cell. The air bag 2 is located on one side of the containing bag 1. The air bag 2 is used to store the gas generated during the formation process of the battery cell. An air pit 21 for accommodating the gas is provided in the air bag 2. The packaging film is provided with a diversion groove 3 between the containing bag 1 and the air pit 21. The diversion groove 3 is recessed outward from the packaging film. One end of the diversion groove 3 is communicated with the containing bag 1, and the other end of the diversion groove 3 is communicated with the air pit 21. The gas generated during the formation process of the battery cell can pass through the diversion groove 3 from the containing bag 1 to the air pit 21. During the formation process of the battery cell, since the containing bag 1 needs to be evacuated, part of the electrolyte in the containing bag 1 will enter the air pit 21 under the action of air pressure. When the evacuation is over, the electrolyte in the air pit 21 can flow back into the containing bag 1 along the diversion groove 3.
[0030] By providing the air pit 21 in the air bag 2 in the present application, during the formation process of the soft-pack battery, the air pit 21 can accommodate more gas, solving the problem of large gas generation during the formation process causing the deformation of the second seal, and there is no need to lengthen the air bag 2, saving the use cost of the packaging film; by providing the diversion groove 3 between the containing bag 1 and the air pit 21, after the containing bag 1 is evacuated, the electrolyte in the air pit 21 can flow back into the containing bag 1 along the diversion groove 3, thereby saving the consumption of the electrolyte, reducing the production cost, improving the compatibility of the mold, reducing the management difficulty, saving the rework labor cost for the appearance problem of the second seal edge, and avoiding the risk of poor infiltration of the battery cell caused by the residual electrolyte.
[0031] Refer to Figure 1 , there are at least two diversion grooves 3. Each containing bag 1 is communicated with at least two diversion grooves 3, and each air pit 21 is communicated with at least two diversion grooves 3. There are at least two diversion grooves 3, which is convenient for the electrolyte in the air pit 21 to flow into the containing bag 1 quickly, and the gas in the containing bag 1 can also enter the air pit 21 from the containing bag 1 faster. In addition, when ensuring that one diversion groove 3 is flowing the electrolyte, there are other diversion grooves 3 that can discharge the gas in the containing bag 1, ensuring the smooth gas path between the containing bag 1 and the air pit 21.
[0032] Refer to Figure 1, since the volume of a single air pit 21 is small, to ensure that the gas discharged from the accommodating bag 1 can be stored in the air pit 21, there are at least two air pits 21 corresponding to each accommodating bag 1, and each accommodating bag 1 is respectively connected to at least two air pits 21 through a diversion groove 3. In this embodiment, each accommodating bag 1 is connected to two air pits 21 through a diversion groove 3, each accommodating bag 1 is respectively connected to four diversion grooves 3, and each air pit 21 is respectively connected to two diversion grooves 3.
[0033] Figure 2 is a side view of the battery packaging structure shown in the embodiment of the present application.
[0034] See Figure 1 and Figure 2 , the diversion groove 3 is strip-shaped, which is convenient for the electrolyte or gas to flow in the diversion groove 3, and the strip-shaped diversion groove 3 does not occupy too much volume of the packaging film, which is convenient for the later heat sealing treatment of the part of the packaging film between the air pit 21 and the accommodating bag 1. Specifically, when the packaging film is heat-sealed for the second time, the diversion groove 3 can be heat-sealed. Since the volume of the diversion groove 3 is small, when heat-sealing for the second time, the heat-sealing films where the diversion groove 3 is located can be quickly bonded together, and there is less residual electrolyte in the diversion groove 3, which will not cause excessive waste of the electrolyte.
[0035] See Figure 1 and Figure 2 , the air pit 21 includes a diversion part 211 and a main body part 212. The diversion part 211 is funnel-shaped. The wide opening of the diversion part 211 is connected to the main body part 212, and the narrow opening of the diversion part 211 is connected to the diversion groove 3. The funnel-shaped diversion part 211 is convenient for the electrolyte in the air pit 21 to flow back to the accommodating bag 1, reducing the residual electrolyte in the accommodating bag 1, thereby reducing the consumption of the electrolyte. In some embodiments, the length of the main body part 212 is greater than the length of the diversion part 211 to ensure that the main body part 212 can accommodate more gas. The length of the main body part 212 is less than the length of the accommodating bag 1 to ensure that the air pit 21 does not occupy too much space of the packaging film, thereby saving the use of packaging film materials and production costs. The length of the diversion groove 3 is greater than the length of the diversion part 211. The depth of the air pit 21 is less than the depth of the accommodating bag 1 to avoid the air pit 21 occupying too much volume, saving the use of packaging film, and reducing the residual electrolyte in the air pit 21.
[0036] See Figure 1 , the battery packaging structure further includes a first sealing edge 4 and a side sealing edge 5. The side sealing edge 5 is located on the side of the accommodating bag 1 away from the air bag 2. The first sealing edge 4 is connected to the side sealing edge 5. The first sealing edge 4 is located on one side of the air bag 2 and the accommodating bag 1, and the first sealing edge 4 and the side sealing edge 5 form a 90-degree angle. In the actual packaging process, taking Figure 1For example, a second sealing edge 6 is provided on the side of the airbag 2 away from the accommodating bag 1, a third sealing edge 7 is provided between the airbag 2 and the accommodating bag 1, and the third sealing edge 7 passes through the diversion groove 3. First, the battery cell is placed in the accommodating bag 1, the packaging film is folded along the folding line 8, the first sealing edge 4 and the side sealing edge 5 are heat-sealed. After baking, the electrolyte is injected into the accommodating bag 1, the second sealing edge 6 is heat-sealed, and after formation and grading, the third sealing edge 7 is heat-sealed and the airbag 2 is cut off.
[0037] The solutions of the present application have been described in detail with reference to the accompanying drawings above. In the above embodiments, the descriptions of the various embodiments have their own emphases. For the parts not described in detail in a certain embodiment, reference may be made to the relevant descriptions of other embodiments. Those skilled in the art should also be aware that the actions and modules involved in the specification are not necessarily essential to the present application. In addition, it can be understood that the steps in the method embodiments of the present application can be adjusted, combined, and deleted according to actual needs, and the modules in the device embodiments of the present application can be combined, divided, and deleted according to actual needs.
[0038] The various embodiments of the present application have been described above. The above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations are obvious to those of ordinary skill in the art in the technical field without departing from the scope and spirit of the described embodiments. The choice of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other ordinary skill in the art in the technical field to understand the embodiments disclosed herein.
Claims
1. A battery packaging structure, characterized in that It includes a packaging film, and the packaging film includes a containing bag (1) and an air bag (2). The containing bag (1) is used to place an electric core. The air bag (2) is located on one side of the containing bag (1). An air pit (21) for containing gas is arranged in the air bag (2). A diversion groove (3) is concavely formed between the containing bag (1) and the air pit (21). The diversion groove (3) is respectively communicated with the containing bag (1) and the air pit (21).
2. The battery packaging structure according to claim 1, wherein: There are at least two diversion grooves (3). Each containing bag (1) is at least communicated with two diversion grooves (3). Each air pit (21) is at least communicated with two diversion grooves (3).
3. The battery packaging structure according to claim 1, wherein: There are at least two air pits (21). Each containing bag (1) is respectively communicated with at least two air pits (21) through the diversion groove (3).
4. The battery packaging structure according to claim 1, wherein: The diversion groove (3) is strip-shaped.
5. The battery packaging structure according to claim 1, characterized in that: The air pit (21) includes a diversion part (211) and a main body part (212). The diversion part (211) is funnel-shaped. The wide mouth of the diversion part (211) is communicated with the main body part (212). The narrow mouth of the diversion part (211) is communicated with the diversion groove (3).
6. The battery packaging structure according to claim 5, characterized in that: The length of the main body part (212) is greater than the length of the diversion part (211). The length of the main body part (212) is less than the length of the containing bag (1).
7. The battery packaging structure according to claim 5, wherein: The length of the diversion groove (3) is greater than the length of the diversion part (211).
8. The battery packaging structure according to claim 1, wherein: It further includes a first sealing edge (4) and a side sealing edge (5). The side sealing edge (5) is located on the side of the containing bag (1) away from the air bag (2). The first sealing edge (4) is connected with the side sealing edge (5). The first sealing edge (4) is located on one side of the air bag (2) and the containing bag (1). The first sealing edge (4) and the side sealing edge (5) form a 90-degree angle.
9. The battery packaging structure according to claim 1, wherein: The depth of the air pit (21) is less than the depth of the containing bag (1).
10. The battery packaging structure according to claim 1, wherein: The packaging film is made of an aluminum-plastic film.