Soft package battery
By setting a measurement area at the edge of the aluminum-plastic film and using a design that involves multiple bends to fix the adhesive, the problem of the aluminum-plastic film being difficult to puncture is solved, enabling convenient voltage measurement and maintaining sealing.
Patent Information
- Application Number
- CN202423191733.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-24
- Publication Date
- 2026-02-13
- Estimated Expiration
- 2034-12-24
AI Technical Summary
When testing the voltage between the aluminum-plastic film and the tabs of existing pouch batteries, the aluminum-plastic film is firmly sealed, making it difficult to puncture and easy to damage the seal.
A measurement area is set on the top edge of the aluminum-plastic film without sealing, allowing the aluminum-plastic film to separate. This makes it easy to measure voltage by puncturing only one layer. At the same time, the edge sealing structure is stabilized by multiple bends and fixing adhesive to avoid interference and damage.
It enables convenient voltage measurement, avoids damage to the seal, and ensures the battery's sealing and structural stability.
Smart Images
Figure CN223911685U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to new energy technology field especially relates to a soft package battery. BACKGROUND
[0002] In the related art, the soft package battery is generally used in some intelligent devices, such as mobile phones or watches etc. Among them, since the space left for the soft package battery by the mobile phone is fixed, it is extremely important to make the soft package battery have a high energy density in the limited space. In the manufacturing process of the existing soft package battery, the aluminum plastic film is usually used to package the battery cell. After the aluminum plastic film is packaged, in order to ensure good sealing, the aluminum plastic film is folded, and the aluminum plastic film also needs to be punctured, so as to measure the voltage between the aluminum plastic film and the tab. The aluminum plastic film is usually punctured at the position of the sealing edge of the aluminum plastic film, but the aluminum plastic film at this position is not only relatively firm and not easy to puncture, but also the aluminum plastic film is easy to damage the sealing of the battery cell after puncturing the aluminum plastic film at this position. SUMMARY
[0003] The utility model aims at at least solves one of the technical problems existing in the prior art. For this purpose, the utility model provides a soft package battery, which can detect the voltage between the aluminum plastic film and the tab more conveniently.
[0004] According to the soft package battery of the first aspect of the utility model, the package film includes a main body, a first side sealing edge, a second side sealing edge and a head sealing edge, the first side sealing edge and the second side sealing edge are respectively arranged on the opposite two sides of the main body, the head sealing edge is arranged on one side of the main body, one end of the head sealing edge is connected with the first side sealing edge, and the other end of the head sealing edge is connected with the second side sealing edge; the battery cell includes a body and a tab, the body is arranged in the main body, the tab includes a first part and a second part, the first part is connected to the body, and the second part is connected to the first part and extends out of the package film from the head sealing edge; the head sealing edge includes a first area, a second area and a measurement area, the first area is sealed and sealed, the second area and the measurement area are not sealed and sealed, the first part is arranged in the second area, the first area is arranged between the second area and the edge of the head sealing edge, the measurement area is arranged on the side away from the main body of the first area, and the measurement area is used to measure the voltage between the package film and the tab.
[0005] The soft package battery according to the first aspect of the utility model has at least the following beneficial effects: a measurement area is arranged on the side of the first area away from the main body, and the packaging film of the measurement area is punctured when the voltage between the packaging film and the tab is measured.
[0006] According to some embodiments of the utility model, the head edge is bent into a first fold, a second fold and a third fold in sequence in a first direction, the second fold is bent and attached to the first fold, the third fold is bent and attached to a side of the second fold opposite to the first fold, and the first part is arranged in the first fold.
[0007] According to some embodiments of the utility model, the first fixing glue is arranged between the first fold and the second fold and fixes the second fold on the first fold, and the second fixing glue is arranged between the third fold and the second fold and fixes the third fold on the second fold.
[0008] According to some embodiments of the utility model, the first side edge, the second side edge and the head edge are all connected to the bottom of the side of the main body.
[0009] According to some embodiments of the utility model, the first side edge and the second side edge are bent and attached to the side of the main body.
[0010] According to some embodiments of the utility model, the first side edge and the second side edge do not exceed the top of the main body in a second direction, and the second direction is the direction from the bottom of the side of the main body to the top of the side of the main body.
[0011] According to some embodiments of the utility model, the width of the first side edge and the second side edge in the second direction is not less than 2.8mm.
[0012] According to some embodiments of the utility model, the length of the first fold in the first direction is not less than the length of the second fold in the first direction.
[0013] According to some embodiments of the utility model, the length of the third fold in the first direction is not greater than the length of the second fold in the first direction.
[0014] According to some embodiments of the utility model, when the head edge is unfolded, the interval between the first part and the first area is not less than 1mm.
[0015] The additional aspects and advantages of the utility model will be partly given in the following description, some will become obvious from the following description, or be known by the practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS
[0016] Figure 1 It is a structure schematic view of soft package battery of the utility model;
[0017] Figure 2 It is an unfolding schematic view of soft package battery of the utility model;
[0018] Figure 3 It is a cell structure schematic view of soft package battery of the utility model;
[0019] Figure 4 It is a section schematic view of soft package battery of the utility model;
[0020] Figure 5 It is Figure 4 The local enlarged schematic view of;
[0021] BRIEF DESCRIPTION OF DRAWINGS
[0022] 1, body;2, pole ear;21, first part;22, second part;3, main body;4, head edge;41, first folding edge;42, second folding edge;43, third folding edge;44, first area;45, second area;46, measurement area;5, first side edge;6, second side edge;7, first fixed glue;8, second fixed glue. DETAILED DESCRIPTION
[0023] The embodiments of the utility model are described in detail below, the examples of the embodiments are shown in the drawings, wherein the same or similar signs represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary, only for explaining the utility model, and cannot be understood as the limitation of the utility model.
[0024] In the description of the utility model, it is understood that the orientation description, such as the orientation or position relationship of the indication such as up and down, is based on the orientation or position relationship shown in the drawings, only for the convenience of describing the utility model and simplifying the description, and is not indicated or implied that the indicated device or element must have a particular orientation, a particular orientation and operation, therefore, it cannot be understood as the limitation of the utility model.
[0025] In the description of the utility model, more refers to two or more. If there is a description of first, second, it is only used for distinguishing technical features for the purpose, and can not be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.
[0026] In the description of the utility model, unless otherwise explicitly limited, the words such as setting, installation, connection should be broadly understood, and the person skilled in the art can determine the specific meaning of the above words in the utility model in combination with the specific content of the technical scheme.
[0027] Referring to Figure 1 、 Figure 2 And Figure 3 , the soft package battery in the first embodiment of the utility model, comprising: packaging film and electric core, the packaging film includes main body 3, first side edge 5, second side edge 6 and head edge 4, first side edge 5 and second side edge 6 are respectively arranged in the opposite two sides of main body 3, head edge 4 is arranged in one side of main body 3, one end of head edge 4 is connected with first side edge 5, the other end of head edge 4 is connected with second side edge 6;The electric core includes body 1 and tab 2, body 1 is arranged in main body 3, tab 2 includes first part 21 and second part 22, first part 21 is connected on body 1, second part 22 is connected on first part 21 and extends out of the packaging film from head edge 4.The tab 2 on the electric core needs to extend out of the packaging film, but because the area of the edge on the packaging film is larger, the tab 2 needs to have a longer length to extend out of the packaging film.In order to ensure that the length of the tab 2 is enough to extend out of the packaging film, the tab 2 is set to two parts, wherein the first part 21 is directly connected to the electric core.Usually only the first part 21, the length of the tab 2 is not enough to extend out of the packaging film, therefore, the second part 22 is also provided, and the second part 22 is connected to the first part 21 to form a complete tab 2 with sufficient length.When connecting the second part 22 to the first part 21, the second part 22 is usually welded to the first part 21 by welding method.In the process of welding, welding mark will inevitably be formed, wherein sealing glue can also be arranged at the position of the tab 2 for sealing.
[0028] The head seal 4 includes a first region 44, a second region 45, and a measurement region 46. The first region 44 is sealed, the second region 45 and the measurement region 46 are not sealed, the first part 21 is arranged in the second region 45, and the first region 44 is arranged between the second region 45 and the edge of the head seal 4. The measurement region 46 is arranged on the side of the first region 44 away from the main body 3, and is used to measure the voltage between the packaging film and the tab 2. The first part 21 is arranged in the second region 45, and is not sealed in the second region 45. This is mainly because after the first part 21 and the second part 22 are welded together, a raised welding mark will appear on the first part 21. If the sealing is performed here, the packaging film will be pressed tightly against the raised welding mark, which will not only cause the sealing to fail, but may even pierce the aluminum plastic film. Therefore, the second region 45 is not sealed, and the first region 44 that does not coincide with the first part 21 is sealed.
[0029] The aluminum plastic film used in soft-pack batteries is a composite material, which is usually composed of multiple layers of thin films with different functions. These thin films mainly include an aluminum foil layer, a plastic layer, and an adhesive layer. The main function of the aluminum plastic film is to protect the internal structure of the battery from the adverse effects of the external environment, while maintaining the softness and flexibility of the battery. Specifically, the aluminum foil layer has excellent barrier properties, effectively preventing the penetration of moisture and gas; the plastic layer provides the necessary mechanical strength and good processing performance for the battery; and the adhesive layer ensures the tight combination of the various layers of film, thereby forming a stable and reliable packaging structure. The application of aluminum plastic film in soft-pack batteries significantly improves the overall performance of the battery. It not only enhances the safety of the battery, prolongs the service life of the battery, but also optimizes the electrical performance of the battery. The aluminum plastic film seal of the soft-pack battery is usually achieved through a heat sealing process. First, according to the design requirements of the battery, the aluminum plastic composite film is cut into the required shape and size. Next, the positive and negative electrodes of the battery are extracted and accurately placed on the corresponding positions of the aluminum plastic film. Then, the edges of the aluminum plastic film are heated by a heat sealing machine, causing the heat sealing layer of the aluminum plastic film to melt and bond together at high temperature, thereby forming a sealed seal structure. During the heat sealing process, the temperature and pressure must be accurately controlled to ensure the sealing performance of the seal and the safety of the battery. Finally, after the cooling and solidification stages, the packaging process of the battery is successfully completed.
[0030] In the aluminum plastic film, the aluminum foil layer and the plastic layer are arranged on both sides of the aluminum foil, so when measuring the voltage between the aluminum plastic film and the tab 2, the aluminum plastic film needs to be punctured and connected to the aluminum foil. When forming the head seal 4, two layers of aluminum plastic film need to be laminated, and when forming the first area 44, the two layers of aluminum plastic film need to be laminated and sealed together. At this time, if the first area 44 is punctured, it is difficult, and after the first area 44 is punctured, the structure of the head seal 4 is also damaged. Therefore, the measuring area 46 is arranged on the side of the first area 44 away from the main body 3, and in the measuring area 46, the two layers of aluminum plastic film are separated, and when measuring the voltage between the aluminum plastic film and the tab 2, only one layer of aluminum plastic film needs to be punctured, making it easier to connect to the aluminum foil of the aluminum plastic film, and also without damaging the sealed and sealed area of the packaging film.
[0031] According to some embodiments of the present application, referring to Figure 4 and Figure 5 , the head seal 4 is sequentially bent into the first fold 41, the second fold 42 and the third fold 43 along the first direction, the second fold 42 is bent and laminated on the first fold 41, and the third fold 43 is bent and laminated on the side of the second fold 42 away from the first fold 41, and the first part 21 is arranged in the first fold 41. In order to ensure the sealing effect of the packaging film, the position of the sealing seal needs to exceed a certain width. And the second area 45 and the measuring area 46 need to be arranged on the head seal 4, so the length of the head seal 4 will be longer. In order to avoid the space occupied by the head seal 4 being too large, the head seal 4 is bent and bent into the first fold 41, the second fold 42 and the third fold 43 through two bending points. The two bending processes can make the extension direction of the tab 2 away from the main body 3, avoiding interference between the tab 2 and the main body 3. At the same time, the first part 21 is arranged in the first fold 41, avoiding bending the first part 21. First, it can avoid the position of the weld between the first part 21 and the second part 22, avoiding damaging the weld between the first part 21 and the second part 22. Secondly, when bending, the pressure between the tab 2 and the packaging film is large, avoiding damaging the packaging film by the weld between the first part 21 and the second part 22.
[0032] In the prior art, the soft package battery is generally used in some intelligent devices, such as mobile phones or watches and the like. Among them, since the space left for the soft package battery by the mobile phone is fixed, it is extremely important to make the soft package battery have a higher energy density in the limited space. In the manufacturing process of the existing soft package battery, the aluminum plastic film is usually used to package the battery cell. After the aluminum plastic film is packaged, in order to ensure good sealing, the aluminum plastic film is edge sealed. With the emergence of the demand for ultra-thin batteries, the thickness of the main body 3 of the battery is small, and the edge seal may extend out of the side edge of the main body 3. For example, the thickness of the ultra-thin main body 3 is 3mm, and the length of the head edge seal 4 is greater than 3mm. If the edge seal is pasted on the side edge of the main body 3, the head edge seal 4 will extend upward relative to the main body 3, thereby increasing the thickness of the battery, or the head edge seal 4 is irregularly extruded on the main body 3, causing the contact between the edge seal and the main body 3 to be not flat, and even scratching the main body 3. Therefore, the head edge seal 4 needs to be bent.
[0033] According to some embodiments of the present application, the first fixing glue 7 is arranged between the first folded edge 41 and the second folded edge 42, and fixes the second folded edge 42 on the first folded edge 41. The second fixing glue 8 is arranged between the third folded edge 43 and the second folded edge 42, and fixes the third folded edge 43 on the second folded edge 42. The first folded edge 41, the second folded edge 42 and the third folded edge 43 are fixed and pasted by the first fixing glue 7 and the second fixing glue 8, so that the structure of the head edge seal 4 is more stable, and the second folded edge 42 and the third folded edge 43 are prevented from being warped, thereby affecting the bending of the first side edge seal 5 and the second side edge seal 6.
[0034] According to some embodiments of the present application, the first side edge seal 5, the second side edge seal 6 and the head edge seal 4 are all connected to the bottom of the side of the main body 3, and the first side edge seal 5 and the second side edge seal 6 are bent and pasted on the side of the main body 3. When the first side edge seal 5, the second side edge seal 6 and the head edge seal 4 are all connected to the bottom of the side of the main body 3, the first side edge seal 5 and the second side edge seal 6 are bent to one side to accommodate more sealing edges. When the first side edge seal 5, the second side edge seal 6 and the head edge seal 4 are bent, the head edge seal 4 is bent first, and then the first side edge seal 5 and the second side edge seal 6 are bent, so as to avoid affecting the bending of the head edge seal 4 after the first side edge seal 5 and the second side edge seal 6 are bent. The bent first side edge seal 5 and the second side edge seal 6 can also make the bending of the folded edge on the head edge seal 4 more stable.
[0035] According to some embodiments of the present application, the first side sealing edge 5 and the second side sealing edge 6 do not exceed the top of the main body 3 in the second direction, and the second direction is the direction from the bottom of the side of the main body 3 to the top of the side of the main body 3. If the first side sealing edge 5 and the second side sealing edge 6 exceed the main body 3, more space will be occupied, so that the surface of the battery is not clean enough, and the first side sealing edge 5 and the second side sealing edge 6 of the part exceeding the main body 3 are also easy to scratch other workpieces.
[0036] According to some embodiments of the present application, the width of the first side sealing edge 5 and the second side sealing edge 6 in the second direction is not less than 2.8mm. In order to ensure the sealing effect of the first side sealing edge 5 and the second side sealing edge 6, and avoid sealing failure, the width of the first side sealing edge 5 and the second side sealing edge 6 in the second direction is set to be at least 2.8mm.
[0037] According to some embodiments of the present application, the length of the first folding edge 41 in the first direction is not less than the length of the second folding edge 42 in the first direction. Thus, the second folding edge 42 is avoided from interfering with the main body 3, and further, the length of the first folding edge 41 in the first direction is equal to the length of the second folding edge 42 in the first direction, which can accommodate more first folding edges 41 and second folding edges 42. The space occupied by the head folding edge is smaller.
[0038] According to some embodiments of the present application, the length of the third folding edge 43 in the first direction is not greater than the length of the second folding edge 42 in the first direction. Avoiding the third folding edge 43 from extending too long and causing waste of space.
[0039] According to some embodiments of the present application, when the head sealing edge 4 is unfolded, the interval between the first part 21 and the first area 44 is not less than 1mm. Avoiding the interval between the first part 21 and the first area 44 being too small, so as to avoid the first part 21 colliding with the first area 44, thereby causing damage to the first area 44.
[0040] The welding of the first part 21 and the second part 22 in the tab 2 is also a crucial step, which directly relates to the performance and safety of the battery. Before starting the welding, careful preparation is required. This includes thoroughly cleaning the tab and the surface of the battery sheet to remove any grease, dust or other impurities that may affect the quality of the welding. At the same time, appropriate welding tools and materials such as welding rods, welding wires or welding paste must be selected, which must meet the material characteristics and welding requirements of the battery sheet. In the positioning stage, the tab needs to be accurately placed on the designated welding position of the battery sheet. This is usually done with the help of precise positioning equipment to ensure that the contact area of the tab with the battery sheet is maximized, thereby improving the stability and conductivity of the welding. In some cases, clamps may also be used to fix the tab to prevent displacement during the welding process. The preheating step before welding is essential for some battery sheet materials. Preheating can reduce thermal stress caused by rapid temperature changes during welding, helping to prevent damage to the battery sheet. The control of preheating temperature and time needs to be accurately set according to the specific material of the battery sheet and the metal characteristics of the tab. The next step is the welding process, which requires operators to have certain skills and experience. Spot welding and laser welding are two common welding techniques. Spot welding is usually suitable for mass production, while laser welding is more common in some high-end applications due to its high precision and speed. During the welding process, the welding temperature and time must be strictly controlled to ensure that the strength of the welding point and the integrity of the battery sheet are not damaged. After welding, the battery sheet needs to be properly cooled. Natural cooling is a simple method, but sometimes cooling equipment is used for rapid cooling to improve production efficiency. The control of cooling speed is also important, as too fast cooling may cause cracks inside the battery sheet. The inspection of the welding quality is an indispensable part. Through visual inspection, electrical conductivity test or X-ray detection, etc., it can be ensured that each welding point is firm and reliable, without false welding, missing welding or poor welding. Any welding point that does not meet the standards needs to be re-welded or repaired. Finally, cleaning is also part of the welding process. Remove any residues or splashes generated during the welding process to keep the work environment clean, which is crucial for subsequent battery sheet handling and assembly work. In some cases, insulation treatment or other subsequent treatment may be required after welding to ensure the safety and reliability of the battery sheet during use. These treatment steps need to be determined according to the specific application and safety standards of the battery sheet. The above steps are the basic process of tab welding, but actual operation may need to be adjusted and optimized according to the specific battery sheet and tab material, welding equipment and process requirements. By accurately controlling each step, the quality of the battery sheet welding can be ensured, thereby improving the performance and life of the entire battery product.
[0041] The utility model embodiment makes the detailed explanation in combination with the drawing, but the utility model is not limited to the above -mentioned embodiment, still can make various changes in the knowledge range that the person skilled in the art has possesses without departing from the utility model's tenet under the precondition that the knowledge range that the person skilled in the art has possesses.
Claims
1. A pouch battery, characterized by, The package film comprises a main body, a first side seal, a second side seal and a head seal, the first side seal and the second side seal are respectively arranged on the opposite sides of the main body, and the head seal is arranged on one side of the main body, one end of the head seal is connected with the first side seal, and the other end of the head seal is connected with the second side seal. The electric core comprises a main body and a tab, the main body is arranged in the main body, the tab comprises a first part and a second part, the first part is connected to the main body, and the second part is connected to the first part and extends out of the package film from the head seal. The head seal comprises a first area, a second area and a measurement area, the first area is sealed and sealed, the second area and the measurement area are not sealed and sealed, the first part is arranged in the second area, and the second area and the edge of the head seal are both provided with the first area, the measurement area is arranged on the side away from the main body, and the measurement area is used for measuring the voltage between the package film and the tab. The head seal is sequentially folded into a first fold, a second fold and a third fold along a first direction, the second fold is folded and attached to the first fold, and the third fold is folded and attached to the side of the second fold away from the first fold, and the first part is arranged in the first fold.
2. The pouch battery of claim 1, wherein, Further comprising a first fixing glue and a second fixing glue, the first fixing glue is arranged between the first fold and the second fold and fixes the second fold on the first fold, and the second fixing glue is arranged between the third fold and the second fold and fixes the third fold on the second fold. 3.The pouch battery of claim 2, wherein, The first side seal, the second side seal and the head seal are all connected to the bottom of the side of the main body. 4.The pouch battery of claim 1, wherein, The first side seal and the second side seal are folded and attached to the side of the main body.
5. The pouch battery of claim 4, wherein, The first side seal and the second side seal do not exceed the top of the main body in a second direction, and the second direction is from the bottom of the side of the main body to the top of the side of the main body.
6. The pouch battery of claim 5, wherein, The width of the first side seal and the second side seal in the second direction is not less than 2.8mm.
7. The pouch battery of claim 6, wherein, The length of the first fold in the first direction is not less than the length of the second fold in the first direction. 8.The pouch battery of claim 2, wherein, The length of the third fold in the first direction is not greater than the length of the second fold in the first direction.
9. The pouch battery of claim 8, wherein, When the head seal is unfolded, the interval between the first part and the first area is not less than 1mm. 10.The pouch battery of claim 1, wherein,