A soft-package lithium-ion battery without electromagnetic interference and a manufacturing method thereof

Abstract

The invention discloses a soft-package lithium-ion battery without electromagnetic interference, comprising a winding core body, wherein the winding core body is formed by stacking and winding a rectangular first diaphragm, a positive electrode sheet, a second diaphragm, a negative electrode sheet and a third diaphragm, and the winding core body is reversely wound at least 0.1 turns at the end when the end is closed, one end of the positive electrode sheet is connected to a positive electrode ear, and the connection between the positive electrode sheet and the positive electrode ear is coated with ear glue, and the positive electrode ear is vertically led out from the positive electrode sheet, and one end of the negative electrode sheet is connected to a negative electrode ear, and the connection between the negative electrode sheet and the negative electrode ear is coated with ear glue, and the negative electrode ear is vertically led out from the negative electrode sheet. The invention provides a soft-package lithium-ion battery without electromagnetic interference and a manufacturing method thereof, which has a simple structure and a manufacturing method, can reduce or offset the electromagnetic field generated during charging and discharging, and avoid affecting the normal operation and accuracy of precision components that are sensitive to electromagnetic fields.

Description

Technical Field

[0001] The present invention relates to the technical field of soft-package lithium-ion batteries, and in particular to a soft-package lithium-ion battery without electromagnetic interference and a manufacturing method thereof. Background Art

[0002] The outer packaging materials of lithium batteries are divided into soft packaging and hard packaging. Compared with hard packaging materials such as steel shells and aluminum shells, soft packaging materials made of multi-layer films have the advantages of light weight, large capacity, high safety, and free choice of packaging shape.

[0003] Soft-packaged lithium-ion batteries are generally installed inside small, high-precision components with strict space constraints, such as mice, mobile phones and Bluetooth headsets.

[0004] During the charging and discharging process of soft-packaged lithium-ion batteries, the lithium-ion batteries themselves will generate weak electromagnetic fields. Under normal circumstances, the interference caused to the equipment is not strong and can be ignored. However, if installed in precision components that are sensitive to electromagnetic fields, such as Bluetooth headsets, the lithium-ion batteries will cause certain interference and influence on the speaker magnetic field in the Bluetooth headsets during the charging and discharging process, thereby affecting the playback quality of the Bluetooth headsets and forming noise or murmurs. Therefore, it is of positive significance to manufacture a soft-packaged lithium-ion battery without electromagnetic interference. Summary of the invention

[0005] The purpose of the present invention is to overcome the above-mentioned defects in the prior art and provide a soft-package lithium-ion battery without electromagnetic interference and a method for manufacturing the same. The structure and manufacturing method are simple, and the electromagnetic field generated during the charging and discharging process can be reduced or offset to avoid affecting the normal operation and accuracy of precision components that are sensitive to the electromagnetic field.

[0006] To achieve the above-mentioned purpose, the present invention provides a soft-package lithium-ion battery without electromagnetic interference, including a core body, wherein the core body is formed by stacking and winding a rectangular first diaphragm, a positive electrode sheet, a second diaphragm, a negative electrode sheet and a third diaphragm, and the end of the core body is reversely wound at least 0.1 turns when it is finished. One end of the positive electrode sheet is connected to the positive electrode ear, and the connection between the positive electrode sheet and the positive electrode ear is coated with ear glue, and the positive electrode ear is vertically led out from the positive electrode sheet. One end of the negative electrode sheet is connected to the negative electrode ear, and the connection between the negative electrode sheet and the negative electrode ear is coated with ear glue, and the negative electrode ear is vertically led out from the negative electrode sheet.

[0007] Preferably, the length and width of the first separator, the second separator, the third separator, the positive electrode sheet and the negative electrode sheet are equal, the width is set to 3 to 8 mm, and the length is set to 50 to 1000 mm.

[0008] Preferably, the positive electrode tab is an aluminum-to-nickel tab, the negative electrode tab is a nickel tab, the positive electrode tab is connected to the positive electrode sheet by welding, riveting or punching, and the negative electrode tab is connected to the negative electrode sheet by welding, riveting or punching.

[0009] Preferably, the angle between the positive electrode tab and the negative electrode tab is between 0° and 180°.

[0010] Preferably, the surface of the core body is covered with a circle of first aluminum-plastic film, and the core body is covered with a second aluminum-plastic film and a third aluminum-plastic film from top to bottom and then hot-pressed and sealed to form a battery cell body, and a sealing edge is formed between the second aluminum-plastic film and the third aluminum-plastic film, and the positive electrode tab and the negative electrode tab are both vertically bent multiple times and extend from the inside of the battery cell body.

[0011] Preferably, the sealing edge is attached to the battery cell body, the angle between the positive electrode tab and the axis of the battery cell body is between 0°-90°, and the angle between the negative electrode tab and the axis of the battery cell body is between 0°-90°.

[0012] The present invention also provides a method for manufacturing the above-mentioned soft-package lithium-ion battery without electromagnetic interference, comprising the following steps:

[0013] Step S1: making pole pieces and welding pole tabs, cutting out rectangular positive pole pieces and negative pole pieces, vertically welding the positive pole tab at one end of the positive pole piece, and vertically welding the negative pole tab at one end of the negative pole piece;

[0014] Step S2: manufacturing a winding core body, wherein the winding core body is formed by stacking and winding a rectangular first separator, a positive electrode sheet, a second separator, a negative electrode sheet, and a third separator, and the winding core body is reversely wound at least 0.1 turns at the end;

[0015] Step S3: The core body is fixed, and a circle of the first aluminum-plastic film is wrapped around the surface of the wound core body;

[0016] Step S4: bending the tabs, bending the positive tabs and the negative tabs to the same height on both sides of the winding core body, and making them close to the winding core body;

[0017] Step S5: Aluminum-plastic film sealing, placing the core body between the second aluminum-plastic film and the third aluminum-plastic film and subjecting the core body to hot-pressing sealing to form a battery body, and forming a sealing edge between the second aluminum-plastic film and the third aluminum-plastic film;

[0018] Step S6: injecting electrolyte, activating and resealing, injecting electrolyte into the core body, activating the core body, and then resealing the package;

[0019] Step S7: shaping and folding, trimming the shape of the battery body through punching and cutting tools, removing excess aluminum-plastic film, and bending the sealing edge axially, wherein the sealing edge is closely attached to the surface of the battery body.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The winding core body of the present invention is formed by stacking and winding a rectangular first diaphragm, a positive electrode sheet, a second diaphragm, a negative electrode sheet and a third diaphragm. The end of the winding core body is reversely wound at least 0.1 turns, so that the current direction at the reverse turning point during charging or discharging of the lithium battery is opposite to the previous current direction, so that the electromagnetic field formed by the lithium battery during charging or discharging can be reduced or offset each other, avoiding affecting the normal operation and accuracy of precision components that are sensitive to the electromagnetic field.

[0022] 2. The present invention adopts a stacking and then winding method to form a roll core body, which has a simple structure and manufacturing method and can effectively improve the energy density of the lithium battery so as to be suitable for assembly in more flexible wearable electronic products. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 It is a schematic cross-sectional view of a roll core body of a soft-package lithium-ion battery without electromagnetic interference provided by the present invention;

[0025] Figure 2 This is a top view of a roll core body of a soft-package lithium-ion battery without electromagnetic interference provided by the present invention;

[0026] Figure 3 It is a schematic diagram of the winding structure of a core body of a soft-package lithium-ion battery without electromagnetic interference provided by the present invention;

[0027] Figure 4 yes Figure 3 The enlarged schematic diagram of middle Ⅰ;

[0028] Figure 5 It is a schematic diagram of a flexible package lithium-ion battery without electromagnetic interference provided by the present invention after bending the tab of the winding core body;

[0029] Figure 6 This is a schematic diagram of the main structure of a battery cell of a soft-package lithium-ion battery without electromagnetic interference provided by the present invention;

[0030] Figure 7 This is a front view of a battery cell body of a soft-package lithium-ion battery without electromagnetic interference provided by the present invention;

[0031] Figure 8 It is a schematic structural diagram of a soft-package lithium-ion battery without electromagnetic interference provided by the present invention after its cell body is shaped and folded.

[0032] Included in the figure are:

[0033] 31-first diaphragm, 1-positive electrode sheet, 32-second diaphragm, 2-negative electrode sheet, 33-third diaphragm, 4-winding core body, 5-positive electrode ear, 9-ear glue, 6-negative electrode ear, 81-first aluminum-plastic film, 82-second aluminum-plastic film, 83-third aluminum-plastic film, 10-sealing edge, 7-battery cell body, 84-winding turning point, 85-end of the winding core body. DETAILED DESCRIPTION

[0034] The technical scheme in this embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in this embodiment of the present invention. Obviously, the described embodiment is one embodiment of the present invention, not all embodiments of the present invention. Based on this embodiment of the present invention, all other embodiments of the present invention obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] Embodiment 1

[0036] Please refer to Figures 1 to 8 , Embodiment 1 of the present invention provides a soft-package lithium-ion battery without electromagnetic interference, including a winding core body 4, such as Figure 1 As shown, the core body 4 is formed by stacking and winding a rectangular first diaphragm 31, a positive electrode sheet 1, a second diaphragm, a negative electrode sheet 2 and a third diaphragm 33. The core body 4 is made by stacking and then winding. The structure and manufacturing method of the core body 4 are simple, and the energy density of the lithium battery can be effectively improved, so that it is suitable for assembly on more flexible wearable electronic products.

[0037] like Figure 3 and 4 As shown, the winding core body 4 is reversely wound at least 0.1 turns at the end, so that the current direction at the reverse turning point when the lithium battery is charged or discharged is opposite to the previous current direction, so that the electromagnetic field formed by the lithium battery when charging or discharging can be reduced or offset each other, avoiding affecting the normal operation and accuracy of precision components that are sensitive to the electromagnetic field. The number of reverse winding turns can be selected according to actual needs to meet actual product requirements. In this embodiment, as shown in FIG. Figure 4As shown, the winding core body 4 is reversely wound at the winding turning point 84 . In this embodiment, the reverse winding is nearly one circle, and the end 85 of the winding core body is close to the winding turning point 84 .

[0038] One end of the positive electrode sheet 1 is connected to the positive electrode tab 5, and the connection between the positive electrode sheet 1 and the positive electrode tab 5 is coated with a tab glue 9, and the positive electrode tab 5 is vertically led out from the positive electrode sheet 1. One end of the negative electrode sheet 2 is connected to the negative electrode tab 6, and the connection between the negative electrode sheet 2 and the negative electrode tab 6 is coated with a tab glue 9, and the negative electrode tab 6 is vertically led out from the negative electrode sheet 2. The positive electrode tab 5 and the negative electrode tab 6 can be in the same direction or in opposite directions, which can be selected according to actual conditions and is not limited to this embodiment.

[0039] The length and width of the first diaphragm 31, the second diaphragm 32, the third diaphragm 33, the positive electrode sheet 1 and the negative electrode sheet 2 are equal. The width is set to 3 to 8 mm, and the length is set to 50 to 1000 mm, which can be selected according to actual conditions and is not limited to this embodiment.

[0040] The positive electrode tab 5 is an aluminum-to-nickel tab, the negative electrode tab 6 is a nickel tab, the positive electrode tab 5 is connected to the positive electrode sheet 1 by welding, riveting or punching, and the negative electrode tab 6 is connected to the negative electrode sheet 2 by welding, riveting or punching.

[0041] The angle between the positive electrode tab 5 and the negative electrode tab 6 is between 0° and 180°. Figure 3 As shown, the angle between the positive electrode tab 5 and the negative electrode tab 6 is 90°. Figure 5 As shown, the angle between the positive electrode tab 5 and the negative electrode tab 6 is 180°, which can be selected according to actual conditions and is not limited to this embodiment.

[0042] The outer packaging of the present invention is an aluminum-plastic film outer packaging, which effectively reduces the overall weight of the lithium battery. The surface of the core body 4 is covered with a circle of the first aluminum-plastic film 81. The core body 4 is covered with the second aluminum-plastic film 82 and the third aluminum-plastic film 83 from top to bottom and then hot-pressed and sealed to form a battery cell body 7. A sealing edge 10 is formed between the second aluminum-plastic film 82 and the third aluminum-plastic film 83. The positive electrode tab 5 and the negative electrode tab 6 are both vertically bent multiple times and extend from the inside of the battery cell body 7.

[0043] The sealing edge 10 is attached to the battery cell body 7 , and the sealing edge 10 and the battery cell body 7 are tightly fitted together, thereby reducing the volume of the lithium battery and increasing the unit density of the lithium battery.

[0044] The angle between the positive electrode tab 5 and the axis of the battery cell body 7 is between 0°-90°, and the angle between the negative electrode tab 6 and the axis of the battery cell body 7 is between 0°-90°, so that the positive electrode tab 5 and the negative electrode tab 6 can have greater freedom to adapt to smaller precision components, making it more widely used.

[0045] Embodiment 2

[0046] Embodiment 2 of the present invention provides a method for manufacturing a soft-package lithium-ion battery without electromagnetic interference, comprising the following steps:

[0047] Step S1: making pole pieces and welding pole tabs, cutting out rectangular positive pole pieces 1 and negative pole pieces 2, vertically welding the positive pole tab 5 at one end of the positive pole piece 1, and vertically welding the negative pole tab 6 at one end of the negative pole piece 2;

[0048] Step S2: manufacturing a winding core body 4, wherein the winding core body 4 is formed by stacking and winding a rectangular first separator 31, a positive electrode sheet 1, a second separator, a negative electrode sheet 2 and a third separator 33, and the winding core body 4 is reversely wound at least 0.1 turns at the end;

[0049] Step S3: The winding core body 4 is fixed, and the surface of the wound winding core body 4 is covered with a circle of the first aluminum-plastic film 81;

[0050] Step S4: bending the tabs, bending the positive tab 5 and the negative tab 6 to the two sides of the winding core body 4 to the same height, and making them close to the winding core body 4;

[0051] Step S5: Aluminum-plastic film sealing, placing the core body 4 between the second aluminum-plastic film 82 and the third aluminum-plastic film 83 and subjecting the core body 4 to hot-pressing and sealing molding to form the battery body 7, and forming a sealing edge 10 between the second aluminum-plastic film 82 and the third aluminum-plastic film 83;

[0052] Step S6: injecting electrolyte, activating and resealing, injecting electrolyte into the core body 4, activating the core body 4, and then resealing the package;

[0053] Step S7: shaping and folding, trimming the shape of the battery body 7 through a punching tool, removing the excess aluminum-plastic film, and bending the sealing edge 10 axially, wherein the sealing edge 10 is closely attached to the surface of the battery body 7.

[0054] The above-mentioned manufacturing method is simple to operate, greatly improves the manufacturing efficiency of lithium batteries, and improves the production quality of lithium batteries.

[0055] In summary, the beneficial effects of the present invention are:

[0056] The core body 4 described in the present invention is formed by stacking and winding a rectangular first diaphragm 31, a positive electrode sheet 1, a second diaphragm 32, a negative electrode sheet 2 and a third diaphragm 33. The core body 4 is reversely wound at least 0.1 turns at the end, so that the current direction at the reverse turning point when the lithium battery is charged or discharged is opposite to the previous current direction, so that the electromagnetic field formed by the lithium battery when charging or discharging can be reduced or offset each other, avoiding affecting the normal operation and accuracy of precision components that are sensitive to the electromagnetic field; the present invention adopts the stacking and then winding method to make the core body 4, the structure and manufacturing method are simple, and can effectively improve the energy density of the lithium battery, so that it is suitable for assembly on more flexible wearable electronic products.

Claims

1. A soft-package lithium-ion battery without electromagnetic interference, characterized in that: The invention comprises a winding core body (4), wherein the winding core body (4) is formed by stacking and winding a rectangular first diaphragm (31), a positive electrode sheet (1), a second diaphragm, a negative electrode sheet (2) and a third diaphragm (33); the winding core body (4) is reversely wound for at least 0.1 turns at the end; one end of the positive electrode sheet (1) is connected to a positive electrode tab (5); the connection between the positive electrode sheet (1) and the positive electrode tab (5) is coated with a tab glue (9); the positive electrode tab (5) is vertically led out from the positive electrode sheet (1); one end of the negative electrode sheet (2) is connected to a negative electrode tab (6); the connection between the negative electrode sheet (2) and the negative electrode tab (6) is coated with a tab glue (9); the negative electrode tab (6) is vertically led out from the negative electrode sheet (2).

2. The electromagnetic interference-free soft-package lithium-ion battery according to claim 1, characterized in that: The length and width of the first separator (31), the second separator (32), the third separator (33), the positive electrode sheet (1) and the negative electrode sheet (2) are equal, the width is set to 3 to 8 mm, and the length is set to 50 to 1000 mm.

3. The electromagnetic interference-free soft-package lithium-ion battery according to claim 1, characterized in that: The positive electrode tab (5) is an aluminum-to-nickel tab, and the negative electrode tab (6) is a nickel tab. The positive electrode tab (5) is connected to the positive electrode sheet (1) by welding, riveting, or punching, and the negative electrode tab (6) is connected to the negative electrode sheet (2) by welding, riveting, or punching.

4. The soft-package lithium-ion battery without electromagnetic interference according to claim 1, characterized in that: The angle between the positive electrode tab (5) and the negative electrode tab (6) is between 0° and 180°.

5. The electromagnetic interference-free soft-package lithium-ion battery according to claim 1, characterized in that: The surface of the winding core body (4) is coated with a circle of the first aluminum-plastic film (81), and the winding core body (4) is coated with the second aluminum-plastic film (82) and the third aluminum-plastic film (83) from top to bottom and then hot-pressed and sealed to form a battery cell body (7), a sealing edge (10) is formed between the second aluminum-plastic film (82) and the third aluminum-plastic film (83), and the positive electrode tab (5) and the negative electrode tab (6) are both vertically bent multiple times and extend out from the inside of the battery cell body (7).

6. The electromagnetic interference-free soft-package lithium-ion battery according to claim 5, characterized in that: The sealing edge (10) is attached to the battery cell body (7), the angle between the positive electrode tab (5) and the axis of the battery cell body (7) is between 0° and 90°, and the angle between the negative electrode tab (6) and the axis of the battery cell body (7) is between 0° and 90°.

7. A method for manufacturing a soft-package lithium-ion battery without electromagnetic interference as claimed in any one of claims 1 to 6, characterized in that: The following steps are involved: Step S1: manufacturing pole pieces and welding pole tabs, cutting out rectangular positive pole pieces (1) and negative pole pieces (2), vertically welding the positive pole tab (5) at one end of the positive pole piece (1), and vertically welding the negative pole tab (6) at one end of the negative pole piece (2); Step S2: manufacturing a winding core body (4), wherein the winding core body (4) is formed by stacking and winding a rectangular first separator (31), a positive electrode sheet (1), a second separator, a negative electrode sheet (2) and a third separator (33), and the winding core body (4) is reversely wound at least 0.1 turns at the end; Step S3: the winding core body (4) is fixed, and the surface of the wound winding core body (4) is covered with a circle of the first aluminum-plastic film (81); Step S4: bending the tabs, bending the positive tab (5) and the negative tab (6) to the same height on both sides of the winding core body (4) and making them close to the winding core body (4); Step S5: aluminum-plastic film sealing, placing the core body (4) between the second aluminum-plastic film (82) and the third aluminum-plastic film (83) and performing hot-pressing sealing to form a battery body (7), and forming a sealing edge (10) between the second aluminum-plastic film (82) and the third aluminum-plastic film (83); Step S6: injecting electrolyte, activating and resealing, injecting electrolyte into the core body (4), activating the core body (4), and then resealing the package; Step S7; Shaping and folding are performed by punching and cutting tools to trim the shape of the battery cell body (7), remove excess aluminum-plastic film, and bend the sealing edge (10) axially, wherein the sealing edge (10) is tightly attached to the surface of the battery cell body (7).

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