Battery

Abstract

To provide a battery capable of easily and effectively improving the drop performance of the battery without affecting the energy density or a production process of the battery.SOLUTION: The present invention provides a battery including a package bag, an electrode assembly 10, an adapter 20, and a sealing material 40. The electrode assembly is provided inside the package bag. The electrode assembly includes a first electrode piece 11, and a first electrode lug 110 electrically connected to the first electrode piece. A first end 21 of the adapter is connected to the first electrode lug, and a second end 22 of the adapter stretches out of the package bag. The sealing material is provided between the adapter and the package bag. Along a width direction of the battery, a width of the first electrode lug is more than or equal to a width of the sealing material. By improving a size relation between the first electrode lug and the sealing material, the penetration of the sealing material to the electrode piece in a drop process of the battery can be effectively prevented.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a battery. [Background technology]

[0002] When a battery is dropped, the electrode assembly installed in the battery packaging bag is susceptible to impact, causing the sealing structure of the packaging bag to be pierced by the tab, resulting in an internal short circuit of the electrode assembly. Conventional designs address this issue by attaching insulating rubber to the electrode assembly. However, the installation of insulating rubber reduces the battery's energy density, and the process of attaching the insulating rubber also increases production steps, affecting production efficiency. Summary of the Invention [Problem to be solved by the invention]

[0003] In view of this situation, the present invention provides a battery that can effectively prevent the sealing material from piercing the pole piece when the battery is dropped by improving the dimensional relationship between the first tab and the sealing material, without affecting the energy density or production process of the battery, and can simply and effectively improve the drop performance of the battery.

[0004] An embodiment of the present invention provides a battery comprising a packaging bag, an electrode assembly, an adapter, and a sealing material. The electrode assembly is provided within the packaging bag. The electrode assembly includes a first pole piece and a first pole lug electrically connected to the first pole piece. A first end of the adapter is connected to the first pole lug, and a second end of the adapter protrudes from the packaging bag. The sealing material is provided between the adapter and the packaging bag. Along the width direction of the battery, the width of the first pole lug is greater than or equal to the width of the sealing material. The first pole tab is accommodated in the packaging bag in a folded state.

[0005] In some embodiments, the first pole ear includes a first portion and a second portion electrically connected to the first portion, the width of the first portion being greater than or equal to the width of the sealant, and the width of the second portion being less than or equal to the width of the sealant.

[0006] In some embodiments, the first portion is electrically connected to the first pole piece and the first end of the adapter is electrically connected to the second portion.

[0007] In some embodiments, the first electrode lug includes a plurality of first electrode lug units, and the plurality of first electrode lug units are stacked along the thickness direction of the battery.

[0008] In some embodiments, along the thickness direction of the battery, the battery includes opposing first and second surfaces, and the width of a first electrode lug unit near the first surface or the second surface is greater than or equal to the width of the sealing material.

[0009] In some embodiments, a vertical distance between a side edge of the electrode assembly and a side edge of the packaging bag along a width direction of the battery is a first distance D, a width of the first electrode tab is W, and a width of the sealing material is L, and a relational expression among the first distance D, the width W of the first electrode tab, and the width L of the sealing material is: JPEG2025169412000002.jpg16170

[0010] In some embodiments, the first electrode lug is provided coaxially with the sealing material along the longitudinal direction of the battery.

[0011] In some embodiments, the ratio of the width W of the first pole ear to the width L of the seal is 1. <W / L≦1.2である。

[0012] In some embodiments, the sealing material includes a first side and a second side that face each other along the longitudinal direction of the battery, the first side being located inside the packaging bag and the second side being located outside the packaging bag.

[0013] In some embodiments, the electrode assembly further comprises a second pole piece, wherein a plurality of the first pole pieces and a plurality of the second pole pieces are alternately stacked to form the electrode assembly, or the first pole pieces and the second pole pieces are stacked and wound to form the electrode assembly, and the first pole piece protrudes beyond the second pole piece along the longitudinal direction of the battery.

[0014] In some embodiments, along the longitudinal direction of the battery, the vertical distance between the first pole piece and the packaging bag is a second distance P, the vertical distance between the sealing material and the first pole piece is a third distance S, the length by which the first pole piece extends beyond the second pole piece is a fourth distance A, and the relationship between the second distance P, the third distance S, and the fourth distance A is S+A≧P.

[0015] In some embodiments, the second distance P ranges from 1.0 to 3.8 mm, the third distance S ranges from 1.0 to 4.3 mm, and the fourth distance A ranges from 0.1 to 1.2 mm.

[0016] In some embodiments, the edges of the seal are rounded.

[0017] In some embodiments, the folded state of the first pole lug comprises one of a "V" shape or a "U" shape.

[0018] In some embodiments, at least a portion of the projection of the adapter is within the projection range of the first pole tab in a projection plane perpendicular to the longitudinal direction of the battery.

[0019] In some embodiments, the projected area of ​​the adapter is within the projected area of ​​the first pole tab in the width direction of the battery.

[0020] In some embodiments, the battery further comprises an insulating material provided between the main body of the electrode assembly and the first electrode lug in a folded state.

[0021] By improving the dimensional relationship between the first electrode tab and the sealing material, the above battery can effectively prevent the sealing material from piercing the electrode piece when the battery is dropped, which does not affect the energy density of the battery or the production process, and simultaneously can simply and effectively improve the drop performance of the battery. [Brief explanation of the drawings]

[0022] [Figure 1] 1 is a schematic diagram of a battery according to an embodiment of the present invention with a packaging bag removed. [Figure 2] FIG. 2 is a schematic diagram of the structure of the battery shown in FIG. 1 with the tabs folded. [Figure 3] FIG. 3 is a schematic diagram of a side configuration of one embodiment of the battery shown in FIG. 2. [Figure 4] FIG. 3 is a schematic diagram of a side configuration of one embodiment of the battery shown in FIG. 2. [Figure 5] FIG. 3 is a schematic diagram of a side configuration of one embodiment of the battery shown in FIG. 2. [Figure 6] 3 is a schematic diagram of a front configuration of the battery shown in FIG. 2 after a packaging bag is placed on the battery. [Figure 7] 7 is a schematic diagram of the battery shown in FIG. 6 with a portion of the packaging bag cut away. DETAILED DESCRIPTION OF THE INVENTION

[0023] Hereinafter, the technical solutions related to the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0024] It should be noted that when an element is referred to as being "fixed" to another element, it may be directly fixed to the other element, or there may be a central assembly. When an element is referred to as being "connected" to another element, it may be directly connected to the other element, or there may be a central assembly.

[0025] When one element is referred to as being "set" to another element, it may be set directly to the other element or there may be a central assembly present at the same time. As used herein, the terms "vertical," "horizontal," "left," "right," and similar terms are for descriptive purposes only.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art of the present invention. The terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "or / and" used herein includes any and all combinations of one or more associated listed items.

[0027] An embodiment of the present invention provides a battery comprising a packaging bag, an electrode assembly, an adapter, and a sealing material. The electrode assembly is provided within the packaging bag. The electrode assembly comprises a first pole piece and a first pole lug electrically connected to the first pole piece. A first end of the adapter is connected to the first pole lug, and a second end of the adapter protrudes from the packaging bag. The sealing material is provided between the adapter and the packaging bag. Along the width direction of the battery, the width of the first pole lug is greater than or equal to the width of the sealing material.

[0028] By improving the dimensional relationship between the first electrode tab and the sealing material, the above battery can effectively prevent the sealing material from piercing the electrode piece when the battery is dropped, thereby providing a battery that can simply and effectively improve the drop performance of the battery without affecting the energy density or production process of the battery.

[0029] Some embodiments of the present invention will be described in detail below. If there is no conflict, the following embodiments and features in the embodiments can be combined with each other.

[0030] 1 to 3, in an embodiment of the present invention, a battery 100 includes an electrode assembly 10, an adapter 20, a packaging bag 30, and a sealing material 40. The electrode assembly 10 is provided within the packaging bag 30, the adapter 20 is electrically connected to the electrode assembly 10, and one end of the adapter 20 protrudes from the packaging bag 30. The sealing material 40 is provided between the adapter 20 and the packaging bag 30 and connects the adapter 20 to the packaging bag 30.

[0031] The electrode assembly 10 includes a first pole piece 11, a second pole piece 12, and a separator 13. According to one embodiment of the present invention, the electrode assembly 10 includes a plurality of alternately stacked first pole pieces 11 and second pole pieces 12. In another embodiment of the present invention, the first pole pieces 11 and second pole pieces 12 are stacked and wound to form the electrode assembly 10. The first pole piece 11 and the second pole piece 12 have opposite polarities, and the separator 13 is disposed between the first pole piece 11 and the second pole piece 12. The electrode assembly 10 further includes a first pole lug 110 and a second pole lug 120. The first pole lug 110 is electrically connected to the first pole piece 11. The second pole lug 120 is electrically connected to the second pole piece 12.

[0032] The adapter 20 includes opposing first and second ends 21 and 22. The first end 21 of one adapter 20 is connected to a first electrode lug 110, and the second end 22 protrudes from the packaging bag 30. The first end 21 of the other adapter 20 is connected to a second electrode lug 120, and the second end 22 protrudes from the packaging bag 30. The widths of the first electrode lug 110 and the second electrode lug 120 along the width direction of the battery 100, i.e., the direction indicated by arrow X in FIG. 1 , are both greater than or equal to the width of the sealing material 40. When the battery 100 is dropped, the relatively larger widths of the first electrode lug 110 and the second electrode lug 120 prevent the sealing material 40 from colliding with the electrode pieces, avoiding the problem of the electrode pieces being punctured and causing a short circuit inside the battery 100.

[0033] According to one embodiment of the present invention, the first electrode tab 110 includes a first portion 111 and a second portion 112 electrically connected to the first portion 111. The first portion 111 is electrically connected to the first electrode piece 11, and the second portion 112 is electrically connected to the first end 21 of the adapter 20. The width of the first portion 111 may be greater than or equal to the width of the sealant 40, and the width of the second portion 112 may be less than or equal to the width of the sealant 40, so that the first electrode tab 110 is connected to one end of the adapter 20 and does not affect the sealing effect of the packaging bag 30. Methods of electrical connection include, but are not limited to, soldering and conductive adhesive.

[0034] The top edge of the first pole piece 11 protrudes beyond the top edge of the second pole piece 12 in the longitudinal direction of the battery 100, i.e., along the direction indicated by the arrow Y in FIG. 1 . Therefore, even if the corner of the bottom edge of the sealing material 40 accidentally breaks through the top edge region of the first pole piece 11 while the battery 100 is being dropped, this region does not overlap with the second pole piece 12, and therefore no internal short circuit problem occurs, further preventing the internal short circuit problem from occurring while the battery 100 is being dropped.

[0035] 2 and 3, one end of the electrode assembly 10 where the first electrode tab 110 is provided along the longitudinal direction of the battery 100 includes a first end face 14. In order to increase the energy density of the battery 100 and reduce the length dimension, the second portion 112 of the first electrode tab 110 is folded toward the first end face 14 and is housed in the packaging bag 30 in a folded state. When the battery 100 is dropped, the wider first portion 111 serves to block the sealing material 40. The folding shape of the second portion 112 includes, but is not limited to, a "V" shape, a "U" shape, an "L" shape, an "N" shape, and the like.

[0036] In an embodiment of the present invention, on a projection plane perpendicular to the longitudinal direction of the battery 100, at least a portion of the projection of the adapter 20 falls within the projection range of the first pole ear 110. Specifically, referring to Figure 3, in the width direction of the battery 100, the projection area of ​​the adapter 20 falls within the projection area of ​​the first pole ear 110.

[0037] In some embodiments, the first electrode lug 110 further includes a plurality of first electrode lug units 1101 for reducing the internal resistance of the battery and improving the charge / discharge rate performance of the battery 100. The plurality of first electrode lug units 1101 are stacked to form a first portion 111 of the first electrode lug 110 along the thickness direction of the battery 100, i.e., the direction indicated by arrow Z in FIG. 3. According to one embodiment of the present invention, the width of each first electrode lug unit 1101 is greater than or equal to the width of the sealing material 40.

[0038] 3 and 4, in another embodiment, the battery 100 includes a first surface 101 and a second surface 102 facing each other along the thickness direction of the battery 100. Along the width direction of the battery 100, the projection of the sealant 40 is flush with the projection of the first surface 101 or the second surface 102, or the projection of the sealant 40 is located between the first surface 101 and the second surface 102. When the battery 100 is dropped, the sealant 40 collides with a first electrode lug unit 1101 whose projection position is higher than the sealant 40. To save materials and reduce the manufacturing cost of the battery 100, the width of one or more of the first electrode lug units 1101 whose projection position is higher than the sealant 40 may be greater than or equal to the width of the sealant 40, while the widths of the first electrode lug units 1101 at other positions may be smaller than the width of the sealant 40.

[0039] Referring to FIG. 5, in some embodiments, the battery 100 further includes an insulating material 50, which is provided between the main body of the electrode assembly 10 and the second portion 112 in the folded state, to prevent the second portion 112 from coming into contact with the pole piece and causing a short circuit when folded.

[0040] 2 and 6, in some embodiments, the first electrode tab 110 is disposed coaxially with the sealing material 40 along the longitudinal direction of the battery 100. Along the width direction of the battery 100, the vertical distance between the side edge of the electrode assembly 10 and the side edge of the packaging bag 30 is a first distance D, the width of the first electrode tab 110 is W, and the width of the sealing material 40 is L. The first distance D is the maximum movement distance of the electrode assembly 10 along the width direction of the battery while the battery 100 is being dropped. To prevent the sealing material 40 from piercing the pole piece after the electrode assembly 10 has moved, the relationship between the first distance D, the width W of the first electrode tab 110, and the width L of the sealing material 40 is JPEG2025169412000003.jpg16170

[0041] Specifically, in some embodiments, the ratio of the width W of the first pole ear 110 to the width L of the seal material 40 is 1. <W / L≦1.2である。

[0042] 7, along the longitudinal direction of the battery 100, the sealing material 40 includes opposing first and second side portions 41 and 42. To better seal the connection points between the first electrode tab 110 and the second electrode tab 120 and the packaging bag 30, the first side portion 41 is located inside the packaging bag 30, and the second side portion 42 is located outside the packaging bag 30.

[0043] Along the longitudinal direction of the battery 100, the vertical distance between the top edge of the first pole piece 11 and the packaging bag 30 is a second distance P, the vertical distance between the bottom edge of the sealing material 40 and the top edge of the first pole piece 11 is a third distance S, and the length by which the first pole piece 11 extends beyond the second pole piece 12 is a fourth distance A. The third distance S is the maximum movement distance of the sealing material 40 along the longitudinal direction of the battery. To prevent the sealing material 40 from piercing the first pole piece 11 and the second tab 12 simultaneously and causing a short circuit, the relationship between the second distance P, the third distance S, and the fourth distance A is S+A≧P.

[0044] In some embodiments, the second distance P ranges from 1.0 to 3.8 mm, the third distance S ranges from 1.0 to 4.3 mm, and the fourth distance A ranges from 0.1 to 1.2 mm.

[0045] In the embodiment of the present invention, the sealant 40 has a substantially rectangular shape, but in other embodiments, the sealant 40 may have an oval, polygonal, or other shape, and the present invention is not limited thereto. The edges of the sealant 40 may be rounded to further reduce damage to the electrode assembly 10 by the sealant 40 when the battery is dropped.

[0046] The above embodiments have only described the technical solution of the present invention and do not limit it. Although the present invention has been described in detail with reference to the above preferred embodiments, those skilled in the art will understand that the technical solution of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solution of the present invention. [Explanation of symbols]

[0047] 100 batteries 101 1st surface 102 Second surface 10 Electrode assembly 11 First pole piece 110 1st polar ear 111 Part 1 112 Part 2 1101 1st pole ear unit 12 Second pole piece 120 2nd polar ear 13 Separator 14 First end surface 20 Adapter 21 1st end 22 2nd end 30 packaging bags 40 Sealing material 41 First side 42 Second side 50 Insulation

Claims

1. Packaging bags and an electrode assembly provided in the packaging bag, the electrode assembly including a first pole piece and a first pole lug electrically connected to the first pole piece; an adapter having a first end connected to the first pole lug and a second end extending from the packaging bag; The battery is provided with a sealant between the adapter and the packaging bag, Along the width direction of the battery, the width of the first electrode tab is greater than or equal to the width of the sealing material; The battery is characterized in that the first electrode tab is accommodated in the packaging bag in a folded state.

2. the first pole lug includes a first portion and a second portion electrically connected to the first portion; the width of the first portion is greater than or equal to the width of the seal; 2. The battery according to claim 1, wherein the width of the second portion is smaller than or equal to the width of the sealing material.

3. 3. The battery of claim 2, wherein the first end of the adapter is electrically connected to the second portion.

4. the first pole lug includes a plurality of first pole lug units; The battery according to claim 1 , wherein a plurality of the first electrode lug units are stacked along the thickness direction of the battery.

5. Along a thickness direction of the battery, the battery includes opposing first and second surfaces; 5. The battery of claim 4, wherein the width of the first electrode lug unit near the first surface or the second surface is greater than or equal to the width of the sealing material.

6. A vertical distance between a side edge of the electrode assembly and a side edge of the packaging bag along a width direction of the battery is a first distance D, a width of the first electrode tab is W, and a width of the sealing material is L, and the relational expression among the first distance D, the width W of the first electrode tab, and the width L of the sealing material is:

2. The battery according to claim 1 .

7. 7. The battery according to claim 6, wherein the first electrode tab is provided coaxially with the sealing material along the longitudinal direction of the battery.

8. 2. The battery according to claim 1, wherein a ratio of a width W of the first electrode tab to a width L of the sealing material satisfies 1<W / L≦1.

2.

9. The electrode assembly further includes a second pole piece, A plurality of the first pole pieces and a plurality of the second pole pieces are alternately stacked to form the electrode assembly, or the first pole pieces and the second pole pieces are stacked and wound to form the electrode assembly, 2. The battery according to claim 1, wherein the first pole piece protrudes beyond the second pole piece along the longitudinal direction of the battery.

10. The battery of claim 9, wherein a vertical distance between the first pole piece and the packaging bag along the longitudinal direction of the battery is a second distance P, a vertical distance between the sealing material and the first pole piece is a third distance S, a length by which the first pole piece extends beyond the second pole piece is a fourth distance A, and the relationship between the second distance P, the third distance S, and the fourth distance A is S+A≧P.

11. The battery according to claim 10, wherein the second distance P is in the range of 1.0 to 3.8 mm, the third distance S is in the range of 1.0 to 4.3 mm, and the fourth distance A is in the range of 0.1 to 1.2 mm.

12. 2. The battery according to claim 1, wherein the edges of the sealant are rounded.

13. 2. The battery of claim 1, wherein the first pole lug has a bent shape that includes one of a "V" shape or a "U" shape.

14. 2. The battery according to claim 1, wherein at least a portion of the projection of the adapter is within a projection range of the first pole tab on a projection plane perpendicular to the longitudinal direction of the battery.

15. The battery according to claim 14, wherein the projected area of ​​the adapter is within the range of the projected area of ​​the first pole tab in the width direction of the battery.

16. The battery according to claim 1 , further comprising an insulating material provided between the body of the electrode assembly and the first electrode lug in the folded state.

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