Roll core unit, battery and electronic equipment

Abstract

The utility model discloses a roll core unit, battery and electronic equipment, the roll core unit includes: roll core body, roll core body includes first pole piece and second pole piece, the side face of roll core body has first leading-out foil and second leading-out foil, the first leading-out foil is connected with the first side of first pole piece in width direction, and the second leading-out foil is connected with the second side of second pole piece in width direction. The second leading-out foil is connected with the first side of the second pole piece in the width direction, and the first leading-out foil and the second leading-out foil are spaced in the winding direction of the first pole piece and the second pole piece; the first tab is connected with the first lead-out foil, and the second tab is connected with the second lead-out foil; and the first insulating gummed paper covers the first leading-out foil, the second leading-out foil, the joint of the first tab and the first leading-out foil and the joint of the second tab and the second leading-out foil.

Description

Technical Field

[0001] This utility model belongs to the field of battery technology, specifically relating to a winding unit, a battery, and an electronic device. Background Technology

[0002] In related technologies, the positive and negative lead foils of the core unit are typically stacked. After the tabs are soldered, the positive and negative lead foils are wrapped with insulating tape and then folded to the side of the core. However, during the folding of the first and second lead foils to the side of the core, wrinkles may appear on the inner lead foil due to the thickness difference between the two layers, which increases the risk of battery failure during use.

[0003] Therefore, a new technical solution is needed to solve the above-mentioned technical problems. Utility Model Content

[0004] The first objective of this invention is to provide a new technical solution for a core unit.

[0005] The second objective of this invention is to provide a new technical solution for batteries.

[0006] The third objective of this invention is to provide a new technical solution for electronic devices.

[0007] According to a first aspect of the present invention, a winding core unit is provided, comprising: a winding core body, the winding core body including a first electrode sheet and a second electrode sheet, the side of the winding core body having a first lead-out foil and a second lead-out foil, the first lead-out foil being connected to a first side in the width direction of the first electrode sheet, the second lead-out foil being connected to a first side in the width direction of the second electrode sheet, and the first lead-out foil and the second lead-out foil being spaced apart in the winding direction of the first electrode sheet and the second electrode sheet; a first electrode tab and a second electrode tab, the first electrode tab being connected to the first lead-out foil, and the second electrode tab being connected to the second lead-out foil; a first insulating adhesive paper, the first insulating adhesive paper covering the first lead-out foil and the second lead-out foil, as well as the connection points of the first electrode tab and the first lead-out foil and the second electrode tab and the second lead-out foil.

[0008] Optionally, the core unit further includes an insulating connector that covers the middle section of the first tab and the second tab, wherein the first tab and the second tab are spaced apart along the width direction of the first electrode sheet.

[0009] Optionally, in the thickness direction of the first lead foil, the position of the first tab is offset from the position of the second lead foil.

[0010] Optionally, in the thickness direction of the first lead foil, the position of the second tab is offset from the position of the first lead foil.

[0011] Optionally, the surface of the first lead foil corresponding to the second electrode tab is provided with a second insulating adhesive paper.

[0012] Optionally, the surface of the second lead foil corresponding to the first electrode tab is provided with a third insulating adhesive paper.

[0013] Optionally, the first insulating tape covers the portion of the first tab and the second tab located on the side of the insulating connector closer to the first lead foil.

[0014] Optionally, the core body is configured as a curved flat core or a straight flat core.

[0015] Optionally, the first tab and the second tab located on the side of the insulating connector near the first lead foil are provided with one or more bends that are adapted to one end of the winding core body in the length direction.

[0016] According to a second aspect of the present invention, a battery is provided, comprising the winding unit described in any of the preceding claims.

[0017] According to a third aspect of the present invention, an electronic device is provided, including the aforementioned battery.

[0018] According to the core unit of this utility model, the first insulating adhesive paper can play an insulating role and effectively connect the first lead foil and the second lead foil, making it easy to fold the two lead foils to the side of the core unit at one time; and by spacing the first lead foil and the second lead foil in the winding direction, the first lead foil and the second lead foil can be kept flat, which can effectively avoid wrinkles caused by thickness differences when folding the lead foil, thereby effectively reducing the risk of battery failure during use and improving battery reliability.

[0019] Other features and advantages of the present invention will become clear from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. Attached Figure Description

[0020] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the present invention and, together with their description, serve to explain the principles of the present invention.

[0021] Figure 1 This is a schematic diagram of the structure of the first lead foil of the core body after the second insulating adhesive paper is bonded to it, according to an embodiment of the present invention.

[0022] Figure 2 This is a schematic diagram of the structure of the first lead foil and the second lead foil of the core body according to an embodiment of the present invention after being bonded with the first insulating adhesive paper;

[0023] Figure 3 This is a schematic diagram of the structure of a core unit according to an embodiment of the present invention.

[0024] Figure label:

[0025] 100. Core unit;

[0026] 10. Core body; 11. First lead foil; 111. First lead section; 112. Second lead section; 12. Second lead foil; 20. First tab; 30. Second tab; 40. First insulating tape; 50. Insulating connector; 60. Second insulating tape. Detailed Implementation

[0027] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present invention.

[0028] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0029] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0030] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0031] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0032] The core unit 100 according to an embodiment of the present invention will now be described in detail with reference to the accompanying drawings.

[0033] like Figures 1 to 3 As shown, the core unit 100 according to an embodiment of the present utility model includes a core body 10, a first tab 20, a second tab 30, and a first insulating adhesive paper 40.

[0034] Specifically, the core body 10 includes a first electrode sheet and a second electrode sheet. The side of the core body 10 has a first lead-out foil 11 and a second lead-out foil 12. The first lead-out foil 11 is connected to a first side in the width direction of the first electrode sheet, and the second lead-out foil 12 is connected to a first side in the width direction of the second electrode sheet. The first lead-out foil 11 and the second lead-out foil 12 are spaced apart in the winding direction of the first electrode sheet and the second electrode sheet. A first tab 20 is connected to the first lead-out foil 11, and a second tab 30 is connected to the second lead-out foil 12. A first insulating adhesive paper 40 covers the first lead-out foil 11 and the second lead-out foil 12, as well as the connection between the first tab 20 and the first lead-out foil 11 and the connection between the second tab 30 and the second lead-out foil 12.

[0035] In other words, such as Figures 1 to 3 As shown, the core unit 100 according to an embodiment of the present invention mainly consists of a core body 10, a first electrode tab 20, a second electrode tab 30, and a first insulating adhesive paper 40. The core body 10 includes a first electrode sheet, a second electrode sheet, and a separator. One of the first and second electrode sheets is a positive electrode sheet, and the other is a negative electrode sheet. In this embodiment, the first electrode sheet is a positive electrode sheet, and the second electrode sheet is a negative electrode sheet. During the preparation of the core body 10, the first and second electrode sheets are stacked, and the separator separates the first and second electrode sheets. The length directions of the first electrode sheet, the separator, and the second electrode sheet are the same. The stacked first electrode sheet, the separator, and the second electrode sheet form the core preform. When winding the core body 10, the core preform is wound along its length direction to obtain the core body 10.

[0036] Specifically, such as Figures 1 to 3 As shown, the first electrode has a first lead-out foil 11 (i.e., a current collector without positive electrode material) on its first side in the width direction at the end of the first electrode, and a second lead-out foil 12 (i.e., a current collector without negative electrode material) on its first side in the width direction at the end of the second electrode. When preparing the core body 10, the first lead-out foil 11 and the second lead-out foil 12 are spaced apart along the length direction of the core material. This ensures that after the core body 10 is formed, the first lead-out foil 11 and the second lead-out foil 12 are spaced apart in the winding direction of the first and second electrodes (i.e., the winding direction of the core). This prevents the first lead-out foil 11 and the second lead-out foil 12 from overlapping, effectively avoiding wrinkles after folding.

[0037] like Figures 1 to 3As shown, before the lead foils are soldered to the tabs, the first lead foil 11 and the second lead foil 12 are located on one side of the height direction (i.e., the width direction of the first electrode sheet) of the core body 10. When soldering the tabs, the first tab 20 is soldered to the first lead foil 11, and the second tab 30 is soldered to the second lead foil 12. After the tabs are soldered, the first lead foil 11 and the second lead foil 12, as well as the connection between the first tab 20 and the first lead foil 11 and the second tab 30 and the second lead foil 12, are covered with the first insulating tape 40. Finally, the first lead foil 11 and the second lead foil 12 are folded to the side of the core body 10, so that the first tab 20 and the second tab 30 are led out from the side of the core body 10, and wrinkles can be effectively avoided after the first lead foil 11 and the second lead foil 12 are folded.

[0038] Therefore, according to the embodiment of the present invention, the core unit 100 can provide insulation through the first insulating adhesive paper 40, and effectively connect the first lead foil 11 and the second lead foil 12, making it easy to fold the two lead foils to the side of the core unit 100 at once; and by spacing the first lead foil 11 and the second lead foil 12 in the winding direction, the first lead foil 11 and the second lead foil 12 can be kept flat, which can effectively avoid wrinkles caused by thickness differences when folding the lead foils, thereby effectively reducing the risk of battery failure during use and improving battery reliability.

[0039] According to one embodiment of the present invention, the integral electrode tab further includes an insulating connector 50, which covers the middle section of the first electrode tab 20 and the second electrode tab 30, and the first electrode tab 20 and the second electrode tab 30 are spaced apart along the width direction of the first electrode plate.

[0040] Specifically, such as Figure 3 As shown, the first electrode tab 20 includes a first connecting segment, a first intermediate segment, and a second connecting segment distributed along its length direction, and the second electrode tab 30 includes a third connecting segment, a second intermediate segment, and a fourth connecting segment distributed along its length direction. The first intermediate segment of the first electrode tab 20 and the second intermediate segment of the second electrode tab 30 are connected together by an insulating connector 50. At the same time, the first electrode tab 20 and the second electrode tab 30 are spaced apart in the width direction of the first electrode tab 20.

[0041] In this embodiment, the first electrode 20 and the second electrode 30 are connected by an insulating connector 50 to form a single electrode, which can be welded as a whole. This can effectively reduce the cumulative error that may occur when welding each electrode individually and ensure the positional accuracy of the first electrode 20 and the second electrode 30.

[0042] In some specific embodiments of this utility model, in the thickness direction of the first lead-out foil 11, the position of the first tab 20 is offset from the position of the second lead-out foil 12.

[0043] In other words, the size of the second lead foil 12 is smaller than the size of the first lead foil 11 in the width direction of the first electrode. Specifically, the first lead foil 11 includes a first lead segment 111 and a second lead segment 112 distributed along the width direction of the first electrode. The first lead segment 111 is connected to the first electrode, and its length is the same as the length of the second lead foil 12. The first tab 20 is connected to the second lead segment 112, thereby offsetting the position of the first tab 20 from the position of the second lead foil 12 in the thickness direction of the first lead foil 11, thus preventing contact between the first tab 20 and the second lead foil 12. In this case, even if the insulation structure of the surfaces of the first tab 20 and the second lead foil 12 is damaged, short circuits can be effectively prevented, ensuring the safety and reliability of the battery.

[0044] According to one embodiment of the present invention, in the thickness direction of the first lead-out foil 11, the position of the second tab 30 is offset from the position of the first lead-out foil 11.

[0045] In other words, such as Figure 2 and Figure 3 As shown, the length of the portion of the first tab 20 located on the side of the insulating connector 50 near the first lead foil 11 is d1, and the length of the portion of the second tab 30 located on the side of the insulating connector 50 near the first lead foil 11 is d2, where d2 < d1. This allows the position of the second tab 30 to be offset from the position of the first lead foil 11 along its thickness direction, thus preventing contact between the second tab 30 and the first lead foil 11. In this case, even if the insulation structure of the surfaces of the second tab 30 and the first lead foil 11 is damaged, short circuits can be effectively prevented, ensuring the safety and reliability of the battery.

[0046] In some specific embodiments of this utility model, the surfaces of the first lead-out foil 11 and the second electrode tab 30 are provided with a second insulating adhesive paper 60.

[0047] Specifically, such as Figures 1 to 3 As shown, the first lead-out section 111 of the first lead-out foil 11 corresponds to the position of the second electrode 30. The outer peripheral surface of the first lead-out foil 11 is bonded with a second insulating adhesive paper 60. The second insulating adhesive paper 60 can play a good insulating role between the first lead-out foil 11 and the second electrode 30, which can ensure the safety and reliability of the battery.

[0048] In some optional embodiments of this utility model, the surface of the second lead foil 12 corresponding to the first electrode tab 20 is provided with a third insulating adhesive paper.

[0049] When the first lead foil 11 and the second lead foil 12 have the same length, a portion of the second lead foil 12 corresponds to the position of the first electrode 20 in the thickness direction. In this case, a third insulating paper is adhered to the surface of the portion of the second lead foil 12 corresponding to the position of the first electrode 20. The third insulating paper provides good insulation between the second lead foil 12 and the first electrode 20, ensuring the safety and reliability of the battery.

[0050] According to one embodiment of the present invention, the first insulating adhesive paper 40 covers the portion of the first tab 20 and the second tab 30 located on the side of the insulating connector 50 near the first lead foil 11.

[0051] In this embodiment, the first insulating tape 40 can provide good insulation between the first tab 20 and the second tab 30, which can ensure the safety and reliability of the battery.

[0052] In some specific embodiments of this utility model, the core body 10 is configured as a curved flat core or a straight flat core. When the core body 10 is a curved flat core, it can be applied to curved batteries; when the core body 10 is a straight flat core, it can be applied to prismatic batteries.

[0053] According to one embodiment of the present invention, the portions of the first tab 20 and the second tab 30 near the first lead-out foil 11 are provided with one or more curved portions that are adapted to one end of the core body 10 in the length direction.

[0054] Specifically, the core body 10 is a flat core, and both ends of the core body 10 are bent portions formed by winding. After the first insulating adhesive paper 40 is adhered, the portions of the first tab 20 and the second tab 30 near the first lead foil 11 can be bent once or multiple times, including but not limited to the following situations:

[0055] Case 1: When the lengths of the first pole tab 20 and the second pole tab 30 are relatively short, one end of the first pole tab 20 and the second pole tab 30 in the length direction of the core body 10 can be bent once, so that the first pole tab 20 and the second pole tab 30 form a bent part that matches the end of the core body 10.

[0056] Case 2: When the lengths of the first pole tab 20 and the second pole tab 30 are relatively long, the first pole tab 20 and the second pole tab 30 can be bent multiple times at one end in the length direction of the core body 10, so that the first pole tab 20 and the second pole tab 30 form a bent part that matches the end of the core body 10.

[0057] In this example, by providing bending portions on the first tab 20 and the second tab 30, stress concentration between the tab and the lead foil can be reduced, thus ensuring the reliability of the connection between the tab and the lead foil.

[0058] In summary, the core unit 100 according to this embodiment of the present invention can provide insulation through the first insulating adhesive paper 40, and effectively connect the first lead foil 11 and the second lead foil 12, making it easy to fold the two lead foils to the side of the core unit 100 at once; and by spacing the first lead foil 11 and the second lead foil 12 in the winding direction, the first lead foil 11 and the second lead foil 12 can be kept flat, which can effectively avoid wrinkles caused by thickness differences when folding the lead foils, thereby effectively reducing the risk of battery failure during use and improving battery reliability.

[0059] This utility model also provides a battery, which can be a prismatic battery or a curved battery, and includes the winding core unit 100 described in any of the above embodiments. Since the winding core unit 100 according to the embodiments of this utility model has the above-described technical effects, the battery according to the embodiments of this utility model also has corresponding technical effects, which will not be repeated in this embodiment.

[0060] An embodiment of this utility model also provides an electronic device, including the battery described in the above embodiments. Since the winding unit 100 according to the embodiments of this utility model has the above-described technical effects, the electronic device according to the embodiments of this utility model also has corresponding technical effects, which will not be repeated in this embodiment.

[0061] Although specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A winding core unit, characterized in that, include: The core body (10) includes a first electrode sheet and a second electrode sheet. The side of the core body (10) has a first lead-out foil (11) and a second lead-out foil (12). The first lead-out foil (11) is connected to a first side of the first electrode sheet in the width direction. The second lead foil (12) is connected to the first side of the second electrode in the width direction, and the first lead foil (11) and the second lead foil (12) are spaced apart in the winding direction of the first electrode and the second electrode; A first electrode tab (20) and a second electrode tab (30), wherein the first electrode tab (20) is connected to the first lead foil (11) and the second electrode tab (30) is connected to the second lead foil (12); The first insulating tape (40) covers the first lead foil (11) and the second lead foil (12), as well as the connection between the first tab (20) and the first lead foil (11) and the connection between the second tab (30) and the second lead foil (12).

2. The core unit according to claim 1, characterized in that, Also includes: An insulating connector (50) covers the middle section of the first tab (20) and the second tab (30), and the first tab (20) and the second tab (30) are spaced apart along the width direction of the first electrode sheet.

3. The core unit according to claim 2, characterized in that, In the thickness direction of the first lead foil (11), the position of the first tab (20) is offset from the position of the second lead foil (12).

4. The core unit according to claim 2 or 3, characterized in that, In the thickness direction of the first lead foil (11), the position of the second tab (30) is offset from the position of the first lead foil (11).

5. The core unit according to claim 1, characterized in that, The first lead foil (11) and the second electrode tab (30) have a second insulating adhesive paper (60) on their corresponding surfaces.

6. The core unit according to claim 1, characterized in that, The second lead foil (12) has a third insulating adhesive paper on the surface corresponding to the first electrode tab (20).

7. The core unit according to claim 2, characterized in that, The first insulating tape (40) covers the portion of the first tab (20) and the second tab (30) located on the side of the insulating connector (50) near the first lead foil (11).

8. The core unit according to claim 2, characterized in that, The core body (10) is configured as a curved flat core or a straight flat core.

9. The core unit according to claim 8, characterized in that, The first tab (20) and the second tab (30) located on the side of the insulating connector (50) near the first lead foil (11) have one or more bends that are adapted to one end of the core body (10) in the length direction.

10. A battery, characterized in that, Includes the core unit as described in any one of claims 1 to 9.

11. An electronic device, characterized in that, Includes the battery as described in claim 10.

Images