A battery having a tubular packaging film structure and a semi-finished battery

Abstract

This utility model discloses a battery and a semi-finished battery with a tubular packaging film structure, relating to the field of batteries. By placing the positive and negative electrode tabs on the first side of the battery cell and setting the packaging body as a tubular film structure, the packaging body can form a cavity on the second side of the battery cell to accommodate the gas generated during electrolyte liquefaction. Furthermore, the packaging body can tightly wrap the outside of the battery cell, and the first and second sealing edges achieve a sealed encapsulation of the battery cell, thus eliminating the need for a stamping process to form a concave cavity structure. The upper and lower corners of the packaging body can disperse the deformation stress, improving the corner strength of the packaging body and allowing for the design and manufacture of thicker batteries. Overall, the battery structure of this utility model simplifies the manufacturing process, increases the strength, sealing performance, and lifespan of the packaging, increases the design space for battery thickness, and improves the energy density of the battery.

Description

Technical Field

[0001] This utility model relates to the field of batteries, and in particular to a battery and a semi-finished battery with a tubular packaging film structure. Background Technology

[0002] Pouch lithium-ion batteries are widely used in consumer electronics, new energy vehicles, and other fields due to their advantages such as high energy density, lightweight, and flexible shape design. The core structure of a traditional pouch battery consists of the cell, electrode tabs, electrolyte, and aluminum-plastic film. Among them, the aluminum-plastic film, as the encapsulation shell, plays a crucial role in preventing water and oxygen intrusion and preventing internal electrolyte leakage.

[0003] The typical manufacturing process for existing soft-pack batteries is as follows: An aluminum-plastic film is stamped using a mold to form a concave structure to accommodate the battery cell. The battery cell is placed inside the concave cavity of the aluminum-plastic film, and then the aluminum-plastic film is folded along the center line of the bottom of the battery to wrap the battery cell. The aluminum-plastic film edge at the battery head and one side is heat-sealed, while the aluminum-plastic film on the other side extends outwards and is then heat-sealed, forming a three-sided encapsulation structure with a partial air bladder. The air bladder can accommodate the gas generated by the battery cell during the formation stage. After processes such as degassing and electrolyte replenishment, the sides of the battery are re-heat-sealed, the extended portion is removed, and finally, the left and right sides of the battery are trimmed and folded to form the finished battery.

[0004] Existing technologies suffer from the following problems: the aluminum foil layer thinning process during aluminum-plastic film stamping leads to damage at the four corners of the recessed cavity structure. Thinning of the aluminum foil layer can cause battery leakage, releasing toxic gases and posing safety hazards. Furthermore, the limited stamping depth of the aluminum-plastic film makes it difficult to manufacture batteries with greater thickness. Existing processes require multiple steps, including stamping and cutting, making the process complex. Utility Model Content

[0005] To address the problems existing in the prior art, the main objective of this utility model is to provide a battery and a semi-finished battery with a tubular packaging film structure, which can simplify the processing steps, improve the corner strength of the packaging body, accommodate batteries with greater thickness, reduce the side width of the battery, and increase the energy density of the battery.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] In a first aspect, the present invention provides a battery with a tubular packaging film structure, comprising a battery cell and a packaging body, wherein the battery cell has a first side and a second side opposite to each other, and the first side of the battery cell is connected to two tabs for positive and negative electrodes;

[0008] The packaging body is configured as a tubular membrane structure, which is sleeved outside the battery cell and wraps around the outside of the battery cell between the first side and the second side. A first sealing edge is provided at one end of the packaging body near the first side of the battery cell. The first sealing edge seals two tabs with tab adhesive, and the ends of the two tabs are exposed outside the first sealing edge. A second sealing edge is provided at one end of the packaging body near the second side of the battery cell.

[0009] Preferably, the first sealing edge has a first protruding portion on both sides relative to the battery cell, and the first protruding portion of the first sealing edge is configured as a folded edge structure.

[0010] Preferably, the second sealing edge has a second protruding portion on both sides relative to the battery cell, and the second sealing edge is configured as a folded edge structure that folds towards the second side of the battery cell.

[0011] Preferably, the second sealing edge has a second protruding portion on both sides relative to the battery cell, and the second protruding portion of the second sealing edge is configured as a folded edge structure.

[0012] Preferably, the width of the first edge sealing is equal to or greater than the width of the second edge sealing.

[0013] Preferably, the packaging body is composed of an outer layer, a middle layer and an inner layer in sequence to form a tubular membrane structure.

[0014] Preferably, the outer layer is made of nylon or polyester, the middle layer is made of aluminum foil, and the inner layer is made of polypropylene.

[0015] Preferably, each tab is provided with tab adhesive on its front and back sides, and the first sealing edge is sealed to the tab adhesive on the front and back sides. The material of the tab adhesive is the same as the material of the inner layer of the packaging body.

[0016] Preferably, the width of the tab adhesive is greater than the width of the tab, and the outer end of the tab adhesive extends beyond the first sealing edge.

[0017] In a second aspect, the present invention provides a semi-finished battery with a tubular packaging film structure, comprising a battery cell and a packaging body, characterized in that the battery cell has a first side and a second side opposite to each other, and the first side of the battery cell is connected to two tabs for positive and negative electrodes;

[0018] The packaging body is configured as a tubular film structure, which is sleeved over the battery cell and wraps around the outside of the battery cell between the first side and the second side. The end of the packaging body near the first side of the battery cell is provided with a first sealing edge. The first sealing edge seals two tabs with tab adhesive, and the ends of the two tabs are exposed outside the first sealing edge. The other end of the packaging body extends outward from the second side of the battery cell to form an unsealed section, and the end of the unsealed section is provided with a third sealing edge.

[0019] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0020] (1) The battery of this utility model sets the two tabs of the positive and negative electrodes on the first side of the cell body and sets the packaging body as a tubular membrane structure. This allows the packaging body to set a cavity on the second side of the cell body to accommodate the gas generated during the formation process. At the same time, the packaging body tightly wraps the outside of the cell body through its tubular wall. The cell body is sealed by setting the first and second sealing edges at both ends of the tubular membrane structure, avoiding the process of stamping the packaging body to form a concave cavity structure. When sealing the first and second sides, the deformation stress at the corners of the packaging body is dispersed, thereby giving it higher strength at the corners and making it more suitable for thicker batteries. Overall, the battery of this utility model can simplify the process, improve the strength, sealing performance and life of the packaging body, expand the design space for battery thickness, and improve the energy density of the battery.

[0021] (2) The semi-finished battery of this utility model sets the packaging body as a tubular film structure. By setting the two tabs of the positive and negative poles on the first side of the cell body, and putting the packaging body on the outside of the cell body, a first sealing edge is set on the first side for sealing; the other end of the packaging body extends outward from the second side of the cell body to form an unsealed section. The end of the unsealed section is provided with a third sealing edge. This allows the gas generated during the formation stage to fill the unsealed section of the packaging body. The finished battery can be formed by subsequent processes such as gas extraction, liquid replenishment, cutting and sealing, thereby replacing the traditional method of using aluminum-plastic film three-sided encapsulation process to set up an airbag. Attached Figure Description

[0022] Figure 1 This is a cross-sectional structural diagram of a battery with a tubular packaging film structure according to an embodiment of the present invention;

[0023] Figure 2 This is a three-dimensional structural diagram of a battery cell component with a tubular packaging film structure according to an embodiment of the present invention.

[0024] Figure 3 This is a three-dimensional structural diagram of a packaging component in a battery with a tubular packaging film structure according to an embodiment of the present invention.

[0025] Figure 4 This is a three-dimensional structural schematic diagram of a battery with a tubular packaging film structure according to a first example of an embodiment of the present invention.

[0026] Figure 5 This is a three-dimensional structural schematic diagram of a battery with a tubular packaging film structure according to a second example of an embodiment of the present invention;

[0027] Figure 6 This is a three-dimensional structural diagram of a battery with a tubular packaging film structure according to a third example of an embodiment of the present invention.

[0028] Figure 7 This is a schematic cross-sectional view of a semi-finished battery with a tubular packaging film structure in an unsealed state according to an embodiment of the present invention.

[0029] Figure 8 This is a cross-sectional structural diagram of a semi-finished battery with a tubular packaging film structure in the sealed state according to an embodiment of the present invention.

[0030] Reference numerals: 10, battery cell; A, first side; B, second side; 20, packaging; 21, first sealing edge; 22, first protruding part; 23, second sealing edge; 24, second protruding part; 25, outer layer; 26, middle layer; 27, inner layer; 28, unsealed section; 29, third sealing edge; 30, tab; 31, tab adhesive. Detailed Implementation

[0031] To better illustrate the purpose, technical solution, and advantages of this utility model, the specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0032] It should be noted that when a component / part is referred to as being "set on" another component / part, it can be directly set on the other component / part or there may be an intervening component / part. When a component / part is referred to as being "connected / linked" to another component / part, it can be directly connected / linked to the other component / part or there may be an intervening component / part. The term "connected / linked" as used herein can include electrical and / or mechanical physical connections / links. The term "including / comprises" as used herein means the presence of a feature, step, or component / part, but does not exclude the presence or addition of one or more other features, steps, or components / parts. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of this application. Furthermore, in the description of this application, the terms "first," "second," etc., are used for descriptive purposes and to distinguish similar objects only; there is no order between them, nor should they be construed as indicating or implying relative importance. Additionally, in the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0034] The features described herein may be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein have been provided merely to illustrate some of the many feasible ways of implementing the methods, apparatus, and / or systems described herein that will be apparent upon understanding the disclosure of this application.

[0035] As used herein, the term “and / or” includes any one of the relevant items listed and any combination of any two or more items.

[0036] The terminology used herein is for the purpose of describing various examples only and is not intended to limit this disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms “comprising,” “including,” and “having” enumerate the stated features, quantities, operations, components, elements, and / or combinations thereof, but do not exclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0037] Variations in the shapes shown in the accompanying drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the accompanying drawings, but include changes in shape that may occur during manufacturing.

[0038] like Figures 1 to 6 The image shown illustrates a battery with a tubular packaging film structure according to an embodiment of the present invention. (Reference) Figures 1 to 4 The battery includes a cell 10 and a package 20. The cell 10 is composed of multiple layers of positive electrode plates, negative electrode plates, and separators. Exemplarily and without limitation, in this embodiment, the cell 10 is approximately rectangular.

[0039] refer to Figure 2To achieve the purpose of this utility model, the battery cell 10 has a first side A and a second side B facing each other. In other words, the first side A and the second side B are at a 180° angle. The first side A of the battery cell 10 is provided with two tabs 30 for positive and negative electrodes. Specifically, the electrode handles of all positive electrodes are welded to one of the tabs 30 on the first side A, and the electrode handles of all negative electrodes are also welded to the other tab 30 on the first side A. Typically, the two tabs 30 are parallel to each other and perpendicular to the first side A, and have a predetermined spacing.

[0040] refer to Figure 1 and Figure 3 To achieve the purpose of this utility model, the packaging body 20 is configured as a tubular film structure, that is, a through shape with openings at both ends. The tubular film structure packaging body 20 is fitted over the battery cell 10 and wraps around the outside of the battery cell 10 between the first side A and the second side B. The end of the packaging body 20 near the first side A is provided with a first sealing edge 21. The first sealing edge 21 seals two tabs 30 with tab adhesive 31, and the ends of the two tabs 30 protrude outside the first sealing edge 21. Thus, one end opening of the tubular film structure packaging body 20 is sealed through the first sealing edge 21. At the same time, the packaging body 20 fixes the two tabs 30 and further fixes the battery cell 10 through the first sealing edge 21. The end of the packaging body 20 near the second side B is provided with a second sealing edge 23, so that the other end opening of the tubular film structure packaging body 20 is also sealed through the second sealing edge 23. The packaging body 20 is filled with electrolyte, and the battery cell 10 and the electrolyte are sealed within the first sealing edge 21 and the second sealing edge 23 of the packaging body 20.

[0041] It is worth noting that, since the packaging body 20 is set as a tubular membrane structure and the two tabs 30 of the positive and negative electrodes are set on the first side A of the cell body 10, the packaging body 20 can be set in the second side B to accommodate the gas generated during the formation process. At the same time, the tube wall tightly wraps the outside of the cell body 10, and the sealing is achieved by setting the first sealing edge 21 and the second sealing edge 23 at both ends. This avoids the process of forming a concave cavity structure by stamping. When sealing the edges, the deformation stress of the packaging body 20 at the corners is dispersed, giving it higher strength, thus adapting to batteries with larger thicknesses.

[0042] Therefore, the battery of this utility model can reduce the punching process, improve the strength of the packaging body 20 at the corners, expand the design space for battery thickness, and eliminate the need for left and right side sealing, thereby improving the battery energy density.

[0043] refer to Figure 4In the first specific example of this embodiment, the tubular membrane structure packaging body 20 is fitted over the battery cell 10, with a first sealing edge 21 and a second sealing edge 23 at both ends. To ensure that the tube wall tightly wraps around the outside of the battery cell 10, the inner circumference of the packaging body 20 is slightly greater than or equal to the sum of the widths of the top, bottom, left, and right sides of the battery cell 10. Furthermore, the first sealing edge 21 and the second sealing edge 23 are formed by heat-sealing the openings at both ends of the packaging body 20 together, and the lengths of the first sealing edge 21 and the second sealing edge 23 are approximately equal to half the circumference of the tubular membrane structure packaging body 20. Thus, the length of the first sealing edge 21 is greater than the width of the top and bottom surfaces of the battery cell 10, and the two sides of the first sealing edge 21 have first protruding portions 22 relative to the battery cell 10. Similarly, the length of the second sealing edge 23 is greater than the width of the top and bottom surfaces of the battery cell 10, and the two sides of the second sealing edge 23 have second protruding portions 24 relative to the battery cell 10.

[0044] refer to Figure 5 In the second specific example of this embodiment, the first protruding portions 22 on both sides of the first sealing edge 21 are bent upwards to form a folded edge structure, and the second sealing edge 23 is configured as a folded edge structure that folds towards the second side B of the cell body 10. This reduces the battery length, saving assembly space in the length direction. The second protruding portions 24 on both sides of the second sealing edge 23 are not bent. During battery assembly, the second protruding portions 24 are appropriately bent due to space constraints.

[0045] refer to Figure 6 In the third specific example of this embodiment, the first protruding portions 22 on both sides of the first sealing edge 21 are bent upward to form a folded edge structure, and the second protruding portion 24 of the second sealing edge 23 is set as a folded edge structure. Thus, the lengths of the first sealing edge 21 and the second sealing edge 23 are consistent with the width of the battery, and combined with the fact that no sealing edge is provided on the left and right sides, space in the width direction can be saved.

[0046] Specifically, in this embodiment, refer to Figure 1 and Figure 4 The width of the first sealing edge 21 is equal to the width of the second sealing edge 23, so that the sealing edge width of the packaging body 20 is consistent, thus improving the sealing stability.

[0047] Specifically, in this embodiment, refer to Figure 3 The packaging body 20 forms a tubular film structure, consisting of an outer layer 25, a middle layer 26, and an inner layer 27 connected in sequence. The outer layer 25 is made of nylon (PA), the middle layer 26 is made of aluminum foil, and the inner layer 27 is made of polypropylene (PP). The outer layer 25 and the middle layer 26, as well as the middle layer 26 and the inner layer 27, are connected by adhesive layers.

[0048] Specifically, in this embodiment, refer to Figure 1 and Figure 4Each tab 30 has tab adhesive 31 on its front and back sides. The first sealing edge 21 is sealed to the tab adhesive 31 on both sides. The material of the tab adhesive 31 is the same as that of the inner layer 27 of the packaging body 20, thus achieving a seal between the two tabs 30. Furthermore, the width of the tab adhesive 31 is greater than the width of the tab 30. When the first sealing edge 21 is formed, the inner walls on both sides of the opening of the packaging body 20 are fused with the tab adhesive 31 on both sides. The extended portions of the tab adhesive 31 on both sides relative to the width of the tab 30 are fused together. The tab adhesive 31 on both sides are bonded to the front and back sides of the tab 30 under heat fusion, thereby better achieving the sealing of the hot melt adhesive. The outer end of the tab adhesive 31 extends beyond the first sealing edge 21, thereby better sealing the boundary between the exposed tab 30 and the packaging body 20.

[0049] like Figure 7 and Figure 8 The diagram shows a semi-finished battery with a tubular packaging film structure according to an embodiment of the present invention. The semi-finished battery includes a cell 10 and a packaging body 20. The cell 10 has a first side A and a second side B facing each other. The first side A of the cell 10 has two tabs 30, one for positive and one for negative electrodes. The packaging body 20 is configured as a tubular film structure, i.e., a through shape with openings at both ends. The tubular film structure of the packaging body 20 is fitted over the cell 10 and wraps around the outside of the cell 10 between the first side A and the second side B. A first sealing edge 21 is provided at one end of the packaging body 20 near the first side A. The first sealing edge 21 seals the two tabs 30 with tab adhesive 31, and the ends of the two tabs 30 protrude outside the first sealing edge 21. The other end of the packaging body 20 extends outward from the second side B to form an unsealed section 28, i.e., the length of the tubular film structure of the packaging body 20 is greater than the sum of the width of the first sealing edge 21, the length of the cell 10, and the width of the second sealing edge 23. The unsealed section 28 has a third sealing edge 29 at its end, so that the unsealed section 28 of the packaging body 20 can form a sealed cavity. The packaging body 20 is filled with electrolyte, and the battery cell 10 and the electrolyte are sealed inside the packaging body 20.

[0050] It is worth noting that during the processing of the semi-finished battery in this embodiment, the battery cell 10 with the welded tab 30 can be inserted into the near end opening of the tubular aluminum-plastic film profile, the profile can be cut off at the reserved unsealed section 28 to form the packaging body 20, and liquid can be injected at the far end and heat-sealed to form the third seal 29 to obtain the above-mentioned semi-finished battery.

[0051] It is worth noting that in the subsequent processing of the semi-finished battery in this embodiment, formation is carried out by standing for 24-72 hours at room temperature or under controlled temperature to promote uniform electrolyte wetting of the cell 10. During this time, the gas generated during the formation process will collect in the unsealed section 28 of the packaging body 20 to prevent the emission of harmful gases. After formation, the semi-finished battery is placed in a vacuum environment, and a pressure relief channel is set in the unsealed section 28 of the packaging body 20 to extract harmful gases through negative pressure. After completion, the second side B of the packaging body 20 near the cell 10 is heat-sealed to form a second sealing edge 23, the unsealed section 28 is cut off, and subsequent steps such as molding and testing are performed to prepare the battery of this embodiment.

[0052] Therefore, it can be seen that semi-finished batteries with tubular packaging film structures can replace the traditional aluminum-plastic film three-sided encapsulation process used to set up airbags, and further limit the emission of harmful gases during formation while avoiding the aluminum-plastic film molding process.

[0053] The above embodiments mainly describe the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A battery having a tubular packaging film structure, comprising a cell (10) and a packaging body (20), characterized in that, The battery cell (10) has a first side (A) and a second side (B) opposite to each other. The first side (A) of the battery cell (10) is connected to two tabs (30) for positive and negative electrodes. The packaging body (20) is configured as a tubular membrane structure. The tubular membrane structure of the packaging body (20) is fitted over the battery cell (10) and wraps around the outside of the battery cell (10) between the first side (A) and the second side (B). The packaging body (20) has a first sealing edge (21) at one end of the first side (A) near the battery cell (10). The first sealing edge (21) seals two tabs (30) with tab adhesive (31), and the ends of the two tabs (30) protrude outside the first sealing edge (21). A second sealing edge (23) is provided at one end of the second side (B) of the package (20) near the battery cell (10).

2. A battery with a tubular packaging film structure according to claim 1, characterized in that: The first sealing edge (21) has a first protruding portion (22) on both sides relative to the battery cell (10), and the first protruding portion (22) of the first sealing edge (21) is configured as a folded edge structure.

3. A battery with a tubular packaging film structure according to claim 1, characterized in that: The second sealing edge (23) has a second protruding portion (24) on both sides relative to the battery cell (10), and the second sealing edge (23) is configured as a folded edge structure that folds towards the second side (B) of the battery cell (10).

4. A battery with a tubular packaging film structure according to claim 1, characterized in that: The second edge seal (23) has a second protrusion (24) on both sides relative to the battery cell (10), and the second protrusion (24) of the second edge seal (23) is configured as a folded edge structure.

5. A battery with a tubular packaging film structure according to claim 1, characterized in that: The width of the first edge seal (21) is equal to or greater than the width of the second edge seal (23).

6. A battery with a tubular packaging film structure according to claim 1, characterized in that: The packaging body (20) is composed of an outer layer (25), a middle layer (26) and an inner layer (27) that are sequentially laminated to form a tubular membrane structure.

7. A battery with a tubular packaging film structure according to claim 6, characterized in that: The outer layer (25) is made of nylon or polyester, the middle layer (26) is made of aluminum foil, and the inner layer (27) is made of polypropylene.

8. A battery with a tubular packaging film structure according to claim 6, characterized in that: Each tab (30) has tab adhesive (31) on its front and back sides respectively. The first sealing edge (21) is sealed to the tab adhesive (31) on the front and back sides. The material of the tab adhesive (31) is the same as the material of the inner layer (27) of the packaging body (20).

9. A battery with a tubular packaging film structure according to claim 1, characterized in that: The width of the tab adhesive (31) is greater than the width of the tab (30), and the outer end of the tab adhesive (31) extends beyond the first sealing edge (21).

10. A semi-finished battery having a tubular packaging film structure, comprising an electrode core (10) and a packaging body (20), characterized by, The battery cell (10) has a first side (A) and a second side (B) opposite to each other. The first side (A) of the battery cell (10) is connected to two tabs (30) for positive and negative electrodes. The packaging body (20) is configured as a tubular membrane structure. The tubular membrane structure of the packaging body (20) is fitted over the battery cell (10) and wraps around the outside of the battery cell (10) between the first side (A) and the second side (B). The packaging body (20) has a first sealing edge (21) at one end of the first side (A) near the battery cell (10). The first sealing edge (21) seals two tabs (30) with tab adhesive (31), and the ends of the two tabs (30) protrude outside the first sealing edge (21). The other end of the packaging body (20) extends outward from the second side (B) of the battery cell (10) to form an unsealed section (28), and the end of the unsealed section (28) is provided with a third sealing edge (29).

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