An ultra-narrow battery

Abstract

This utility model discloses an ultra-narrow battery, relating to the field of batteries. This utility model achieves this by configuring two relatively long sides of the battery cell body and two relatively narrow wide sides, and by using a single-film outer packaging structure, applying packaging to one of the long sides and forming a folded edge on the other long side. This allows the ultra-narrow battery to require only a single folded edge, combined with a narrower battery body width. Thus, without changing the thickness, it breaks through the lower limit of lithium-ion battery width, further reducing the minimum feasible width from 6 mm to a theoretical 3 mm, thereby adapting to electronic devices that urgently require smaller power supplies.

Description

Technical Field

[0001] This utility model relates to the field of batteries, and in particular to an ultra-narrow battery. Background Technology

[0002] The current trend towards lightweight consumer electronics has placed higher demands on battery size, especially in the 3C sector, which urgently needs smaller power solutions and smaller batteries to reduce product size and improve user experience.

[0003] In the structure of pouch lithium-ion batteries, to encapsulate the cell, the aluminum-plastic film is heat-sealed together to form a sealed edge after wrapping the cell. Then, the two long sides are folded towards the cell sidewall and heat-sealed to form folded edges, thus creating an airtight barrier to prevent electrolyte leakage and external moisture intrusion, ensuring the battery's chemical stability. To bring out the cell electrodes, positive and negative tabs are welded to one side of the cell. One end of the positive and negative tabs connects to the current collector inside the cell, and the other end extends through the heat-sealed edge to the outside of the battery.

[0004] Currently, the width of mainstream small pouch lithium-ion batteries is generally maintained at over 6 mm. Among the factors limiting the reduction of battery width, one is that the tab width must be at least 2 mm; narrower tabs are difficult to weld later. For a 6 mm wide lithium-ion battery, the distance between the positive and negative tabs is only 1-1.4 mm. Further reduction in tab width or the distance between the positive and negative tabs will increase the risk of battery short circuits, posing a safety hazard. Another limiting factor is that for a 6 mm wide lithium-ion battery, the gap between the folded edges of a typical pouch is already compressed to about 0.1 mm. Further compression of the folded edges towards the battery sidewall can easily lead to deformation of the electrode sheets under pressure, and the aluminum-plastic film is prone to cracking, affecting battery life.

[0005] Therefore, it is evident that under the current battery structure, the battery width is already approaching the design limit. Blindly reducing the size will not only significantly increase the risk of short circuits but also lead to a decrease in cycle life. Utility Model Content

[0006] To address the problems existing in the prior art, the main objective of this utility model is to provide an ultra-narrow battery, which can further reduce the width of the battery by changing its structure.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] An ultra-narrow battery includes an outer packaging body, a cell body disposed within the outer packaging body, and positive and negative tabs connected to the cell body and extending out of the outer packaging body, characterized in that the cell body has a front and a back, as well as two opposing long sides and two opposing wide sides.

[0009] The outer packaging is composed of a single piece of packaging film.

[0010] The outer packaging covers one of the long sides of the battery cell body from the middle;

[0011] After the outer packaging body wraps around the two wide sides of the battery cell body, the edges of the outer packaging body are connected to each other to form a sealed edge.

[0012] After the outer packaging body wraps around another wide side, the edges of the outer packaging body are connected to each other and folded towards the battery cell body to form a folded edge.

[0013] In this utility model, unless otherwise stated, when describing the component structure, the front side refers to the side with the largest battery area, and the back side refers to the opposite side.

[0014] By adopting the above technical solution, a single-piece packaging film is used to package one of the long sides of the battery cell body, forming a sealing edge on two wide sides and a folded edge on the other long side, thereby reducing the width of the battery.

[0015] As an improvement, the cell body includes a positive electrode, a negative electrode, and a separator, wherein the positive electrode and the negative electrode are alternately stacked with the separator in between;

[0016] The positive electrode plate is provided with a positive electrode handle, and the positive electrode handle and the positive electrode tab are welded to one of the wide sides;

[0017] The negative electrode plate is provided with a negative electrode handle, and the negative electrode handle is welded to the negative electrode tab on another wide side.

[0018] By adopting the above technical solution, the positive and negative tabs of the ultra-narrow battery extend from two relatively wide sides, thereby avoiding the risk of short circuit. At the same time, the positive and negative tabs can be set to 1 mm, so that the theoretical width of the ultra-narrow battery can be set to 3 mm.

[0019] As an improvement, two or more positive and negative electrode sheets are each provided, with one more layer of negative electrode sheets than positive electrode sheets. By adopting this technical solution, each positive electrode sheet is sandwiched between two negative electrode sheets, preventing the edge of the positive electrode from directly contacting the electrolyte, suppressing lithium deposition, avoiding the risk of short circuits or thermal runaway, and enhancing battery safety. Simultaneously, the additional negative electrode sheets can release the capacity potential of the positive electrode sheets, effectively improving the battery's energy density.

[0020] As an improved design, the top and bottom negative electrode sheets are composed of a negative electrode current collector coated on one side only, with the negative electrode coating on the bottom side of the top negative electrode sheet and the negative electrode coating on the top side of the bottom negative electrode sheet. The remaining negative electrode sheets are composed of a negative electrode current collector coated on both sides only. By adopting the above technical solution, both the top and bottom negative electrode sheets have a single-sided negative electrode coating structure, thereby effectively reducing the thickness of the battery cell.

[0021] As an improvement, the positive electrode sheet is composed of a positive electrode coating coated on both sides of the positive electrode current collector. By adopting the above technical solution, the double-coated positive electrode sheet and the middle double-sided negative electrode sheet form a symmetrical conductive network, which alleviates the problem of edge current concentration, while the outer single-sided negative electrode sheet can suppress local polarization at the interface between the coating and the current collector.

[0022] As an improvement, the inner ends of the positive and negative tabs are respectively provided with sealing adhesive. The positive tab is connected to one of the sealing edges of the outer packaging through the sealing adhesive, and the negative tab is connected to the other sealing edge of the outer packaging through the sealing adhesive. By adopting the above technical solution, the positive and negative tabs can be sealed to the outer packaging through the sealing adhesive, thereby improving the airtightness of the packaging.

[0023] The width of the positive and negative tabs is 0.9~1.5 mm, and the width of the sealant is greater than the width of the positive and negative tabs. By adopting the above technical solution, the width of the positive and negative tabs is further reduced while ensuring conductivity, and the width of the sealant is increased, thereby further increasing the connection strength between the positive and negative tabs and preventing the tabs from falling off.

[0024] As an improved solution, the two separators are connected by their edges to form a separator bag, and the positive electrode is wrapped inside the separator bag. By adopting the above technical solution, the size of the positive electrode is slightly smaller than that of the negative electrode. Wrapping the positive electrode in the separator bag not only facilitates the stacking process but also makes the overall size of the cell more compact and ensures the safety of the battery.

[0025] As an improvement, the battery cell body has an arc-shaped structure. By adopting the above technical solution, the battery can be used in electronic devices with curved shapes. While maintaining a narrow width, the length is configured to be relatively long, thereby still providing a high battery capacity for the electronic device.

[0026] As an improvement, the width of the wide side of the battery cell body is less than or equal to 4 millimeters. By adopting the above technical solution and based on the above structure, the width of the battery cell body can be set to be narrower than the current conventional 6-millimeter battery, thereby providing a smaller power source for 3C electronic devices.

[0027] As an improvement, the thickness of the battery cell body is less than or equal to 2 mm. By adopting the above technical solution, combined with a narrower battery cell body, the thickness can be further reduced, thereby providing a smaller power supply for 3C electronic devices.

[0028] As an improvement, the thickness of the outer packaging is set to 0.07~0.1 mm. By adopting the above technical solution, the overall width of the folded edge is further reduced while still meeting packaging safety requirements.

[0029] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0030] (1) In this utility model, two of the battery cell bodies are set as longer long sides and two of the other two are set as narrower wide sides. The outer packaging body adopts a single packaging film structure. The packaging is applied to one of the long sides and a folded edge is formed on the other long side. Thus, the ultra-narrow battery only needs to be configured with a single folded edge. Combined with the narrower width of the battery body, the lower limit barrier of the width of lithium-ion batteries is broken without changing the thickness. The lower limit of the width that the battery can be produced is further reduced from 6 mm to the theoretical 3 mm, thus adapting to electronic devices that urgently need smaller power supplies.

[0031] (2) In this utility model, the positive and negative tabs of the battery cell body are extended from two wide sides respectively, so that the width of the tabs can be configured to be narrower, while avoiding the risk of short circuit, and further breaking through the lower limit barrier of the width of lithium-ion batteries.

[0032] The present invention will be further described below with reference to the accompanying drawings. Attached Figure Description

[0033] Figure 1 A three-dimensional structural diagram of an ultra-narrow battery according to an embodiment of the present invention;

[0034] Figure 2 A cross-sectional structural diagram of an ultra-narrow battery according to an embodiment of the present invention;

[0035] Figure 3 A schematic diagram of the stacked three-dimensional structure of the cell body of an ultra-narrow battery according to an embodiment of the present invention.

[0036] Reference numerals: L, long side; W, wide side; 10, outer packaging; 11, sealing edge; 12, folded edge; 20, battery cell body; 31, positive electrode tab; 32, negative electrode tab; 33, sealing compound; 40, positive electrode sheet; 41, positive electrode current collector; 42, positive electrode coating; 43, positive electrode handle; 50, negative electrode sheet; 51, negative electrode current collector; 52, negative electrode coating; 53, negative electrode handle; 61, diaphragm bag. Detailed Implementation

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] As used herein, the term “and / or” includes any one of the relevant items listed and any combination of any two or more items.

[0042] 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.

[0043] 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.

[0044] like Figures 1 to 3 The image shows an ultra-narrow battery according to an embodiment of the present invention. The ultra-thin battery includes an outer packaging body 10, a cell body 20, a positive electrode tab 31, and a negative electrode tab 32. The cell body 20 has a stacked structure and is disposed within the outer packaging body 10. The positive electrode tab 31 and the negative electrode tab 32 are connected to the cell body 20 and extend outside the outer packaging body 10.

[0045] refer to Figure 2 and Figure 3 The battery cell body 20 includes a positive electrode 40, a negative electrode 50, and a separator 60 separating the positive electrode 40 and the negative electrode 50. The positive electrode 40 has four layers, and the negative electrode 50 has five layers, one more layer than the positive electrode 40. The two separators 60 are connected by their edges to form a separator 60 bag, and the positive electrode 40 is wrapped inside the separator 60 bag. Thus, as... Figure 3 As shown, the negative electrode 50, the positive electrode 40 wrapped in the separator 60, and the negative electrode 50 can be alternately stacked to form the cell body 20. Exemplarily, the positive electrode 40 and the negative electrode 50 are configured as rectangles. Thus, the stacked cell body 20 has a pair of front and back surfaces with the largest possible areas. Simultaneously, the stacked cell body 20 also has two opposing long sides L and two opposing wide sides H. The length and width dimensions of the negative electrode 50 are larger than those of the positive electrode 40. The length, width, and thickness dimensions of each positive electrode 40 are consistent, and the length and width dimensions of each negative electrode 50 are consistent.

[0046] To achieve the purpose of this application, the outer packaging 10 is made of a single piece of packaging film. The outer packaging 10 covers one of the long sides L of the battery cell body 20 from the middle. After the outer packaging 10 wraps the two wide sides H of the battery cell body 20, the edges of the outer packaging 10 are heat-sealed together to form a sealing edge 11. After the outer packaging 10 wraps the other wide side H, the edges of the outer packaging 10 are heat-sealed together and folded towards the battery cell body 20 to form a folded edge 12.

[0047] Specifically, the outer packaging 10 is made of aluminum-plastic film. The thickness of the aluminum-plastic film is 0.6 mm. Thus, after packaging, a folded edge 12 is provided only on one long side L, and the width of the folded edge 12 is 0.8 mm. On the other long side L, the outer packaging 10 covers the cell body 20 from the middle, with a width of approximately 0.6 mm, thereby effectively reducing the width of the ultra-narrow battery.

[0048] It can be seen that this utility model breaks through the lower limit barrier of lithium-ion battery width without changing the thickness, further reducing the lower limit of the battery's production width from 6 mm to a theoretical 3 mm, thereby adapting to electronic devices that urgently need smaller power supplies.

[0049] Continue to refer to Figure 3 In this embodiment, specifically, the cell body 20 includes a positive electrode 40, a negative electrode 50, and a separator 60, with the positive electrode 40 and negative electrode 50 alternately stacked at intervals under the separator 60. The positive electrode 40 is provided with a positive electrode handle 43, which is welded to a positive electrode tab 31 on one of its wide sides H; the negative electrode 50 is provided with a negative electrode handle 53, which is welded to a negative electrode tab 32 on the other wide side H. Thus, the positive electrode tab 31 is located on one wide side H of the ultra-narrow battery, and the negative electrode tab 32 is located on the other wide side H of the ultra-narrow battery.

[0050] Further, refer to Figure 1 and Figure 3 The inner ends of the positive tab 31 and the negative tab 32 are respectively provided with sealing gel 33. The positive tab 31 is connected to one of the sealing edges 11 of the outer packaging 10 through the sealing gel 33, and the negative tab 32 is connected to the other sealing edge 11 of the outer packaging 10 through the sealing gel 33. The width of the positive tab 31 and the negative tab 32 is 1 mm, which allows the theoretical width of the ultra-narrow battery to reach 3 mm. The width of the sealing gel 33 is 2.2 mm, which is greater than the width of the positive tab 31 and the negative tab 32. The sealing gel 33 is centrally located on the positive tab 31 and the negative tab 32, which allows the positive tab 31 and the negative tab 32 to be set to a size of less than 2 mm while ensuring the firm fixation between the positive tab 31 and the negative tab 32 and the outer packaging 10. Specifically, the sealing gel 33 is made of PP material, which has the same composition as the aluminum-plastic film material of the outer packaging 10, and can be tightly connected by heat sealing.

[0051] refer to Figure 1 Specifically, the battery in this embodiment is configured as an ultra-narrow battery with an arc shape. To this end, the cell body 20 is hot-pressed into an arc shape after being stacked, and then packaged by the outer packaging body 10.

[0052] refer to Figure 2Specifically, each positive electrode 40 is composed of a positive current collector 41 coated with a positive electrode coating 42 on both sides. The uppermost and lowermost negative electrode 50 are composed of a negative current collector 51 coated with a negative electrode coating 52 on one side, and the remaining negative electrode 50 are composed of a negative current collector 51 coated with a negative electrode coating 52 on both sides. Conventionally but not limited to, each positive electrode 40 has a positive electrode handle 43 on its positive current collector 41, and each negative electrode 50 has a negative electrode handle 53 on its negative current collector 51. The positive electrode handles 43 of each positive electrode 40 are welded to each other and to one tab, and the negative electrode handles 53 of each negative electrode 50 are welded to each other and to the other tab.

[0053] In this embodiment, the width of the wide side H of the cell body 20 can be configured to be less than 4 mm, and the thickness of the cell body 20 is less than 2 mm.

[0054] The ultra-narrow battery of this embodiment can be manufactured using the following processing method, which includes the following steps:

[0055] (1) The positive electrode 40 and the negative electrode 50 are made according to the ultra-thin battery structure in the above embodiment using processes such as material preparation, coating, rolling and sheet making.

[0056] (2) Bag making: The positive electrode 40 is placed between two layers of separator 60. The separator 60 is heated and melted to form a separator 60 bag. The negative electrode 50 only needs to be set to a size that is equivalent to the positive electrode 40 after being wrapped in the separator 60 bag, so that a narrower battery can be produced.

[0057] (3) Stacked packaging: the positive electrode handle 43 and the negative electrode handle 53 are stacked in opposite directions, and then hot-pressed to fix them and form an arc-shaped structure.

[0058] (4) Electrode welding: weld the positive electrode 31 to each positive electrode handle 43 in the cell body 20, and weld the negative electrode 32 to each negative electrode handle 53 in the cell body 20.

[0059] (5) Packaging: The outer packaging body 10, a single-piece packaging film structure, is wrapped around one of the long sides L of the cell body 20 from the middle, forming a fold. On the two wide sides H of the cell body 20, the edges of the folded outer packaging body 10 are wrapped with the connecting adhesive on the tabs, and after heat sealing, a sealing edge 11 is formed. On the other long side L of the cell body 20, the edges of the folded outer packaging body 10 are connected to each other after heat sealing.

[0060] (6) Baking, electrolyte injection and formation are carried out in sequence. After formation, the battery is vacuum-suctioned to remove excess electrolyte and gas generated during formation, making the battery narrower. After completion, excess scraps are cut off and the edge folding 12 is completed.

[0061] After the ultra-narrow battery in this embodiment is manufactured, its width is tested, and the data is shown in the table below.

[0062]

[0063] As can be seen from the table, the width of the ultra-narrow battery of this invention can be less than 4 mm. Through multiple preparations, the width of the ultra-narrow battery of this invention remains stable.

[0064] 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. An ultra-narrow battery, comprising an outer packaging body (10), a cell body (20) disposed within the outer packaging body (10), and a positive electrode tab (31) and a negative electrode tab (32) connected to the cell body (20) and extending outside the outer packaging body (10), characterized in that, The battery cell body (20) has a front and a back, as well as two opposing long sides (L) and two opposing wide sides (W); the outer packaging (10) is composed of a single-piece packaging film, and the outer packaging (10) covers one of the long sides (L) of the battery cell body (20) from the middle. After the outer packaging (10) wraps around the two wide sides (W) of the battery cell body (20), the edges of the outer packaging (10) are connected to each other to form a sealing edge (11); After the outer packaging (10) wraps around another wide side (W), the edges of the outer packaging (10) are connected to each other and folded toward the cell body (20) to form a folded edge (12).

2. The ultra-narrow battery according to claim 1, characterized in that, The cell body (20) includes a positive electrode plate (40), a negative electrode plate (50) and a separator, wherein the positive electrode plate (40) and the negative electrode plate (50) are stacked alternately with the separator between them; the positive electrode plate (40) is provided with a positive electrode handle (43), and the positive electrode handle (43) is welded to a positive electrode tab (31) on one of its wide sides (W); the negative electrode plate (50) is provided with a negative electrode handle (53), and the negative electrode handle (53) is welded to a negative electrode tab (32) on the other wide side (W).

3. The ultra-narrow battery according to claim 2, characterized in that, The positive electrode (40) and the negative electrode (50) are provided in more than two forms, and the number of negative electrode (50) is one more layer than the number of positive electrode (40).

4. The ultra-narrow battery according to claim 3, characterized in that, The uppermost negative electrode (50) and the lowermost negative electrode (50) are composed of a negative electrode current collector (51) coated with a negative electrode coating (52) on one side. The lower side of the uppermost negative electrode (50) is provided with the negative electrode coating (52). The bottommost negative electrode sheet (50) has a negative electrode coating (52) on its upper side, and the remaining negative electrode sheets (50) are composed of a negative electrode current collector (51) coated with a negative electrode coating (52) on both sides. The positive electrode (40) is composed of a positive electrode current collector (41) coated with a positive electrode coating (42) on both sides.

5. The ultra-narrow battery according to claim 2, characterized in that, The inner ends of the positive electrode tab (31) and the negative electrode tab (32) are respectively provided with sealing glue (33). The positive electrode tab (31) is connected to one of the sealing edges (11) of the outer packaging body (10) through the sealing glue (33), and the negative electrode tab (32) is connected to the other sealing edge (11) of the outer packaging body (10) through the sealing glue (33).

6. The ultra-narrow battery according to claim 5, characterized in that, The width of the positive electrode tab (31) and the negative electrode tab (32) is 0.9~1.5 mm, and the width of the sealing colloid (33) is greater than the width of the positive electrode tab (31) and the negative electrode tab (32).

7. The ultra-narrow battery according to claim 3, characterized in that, The two diaphragms are connected by their edges to form a diaphragm bag, and the positive electrode (40) is wrapped in the diaphragm bag.

8. The ultra-narrow battery according to claim 1, characterized in that, The battery cell body (20) has an arc-shaped structure.

9. The ultra-narrow battery according to claim 1, characterized in that, The width of the wide side (W) of the battery cell body (20) is less than or equal to 4 mm, and the thickness of the battery cell body (20) is less than or equal to 2 mm.

10. An ultra-narrow battery according to any one of claims 1 to 9, characterized in that, The thickness of the outer packaging body (10) is set to 0.07~0.1 mm.

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