Battery and battery module

Abstract

The utility model provides a battery and a battery module. The battery comprises a roll core, a first adhesive tape piece and a second adhesive tape piece, the conductive part of the roll core extends out of the outer side of the roll core, and the conductive part of the roll core is used for being welded on a connecting sheet; the first adhesive tape part is respectively adhered to the side wall of the roll core and one part of the conductive part of the roll core; the first adhesive tape part and the second adhesive tape part jointly cover the outer surface of one side, deviating from the connecting piece, of the conductive part of the roll core; the second adhesive tape piece is adhered to the welding part of the conductive part of the roll core and the connecting piece, and the second adhesive tape piece at least abuts against the first adhesive tape piece. According to the battery, the problem that the tab is easy to damage or tear under the action of non-uniform stress is solved, and the first adhesive tape piece and the second adhesive tape piece are jointly and reliably coated on the tab, so that the problems that welding metal foreign matters enter a battery cell and the battery cell is short-circuited due to the fact that electrolyte washes a diaphragm during liquid injection are prevented, and the use performance of the battery is relatively good.

Description

Technical Field

[0001] The present disclosure relates to the technical field of batteries, and in particular to a battery and a battery module. Background Art

[0002] A battery module is an electrochemical device that converts chemical energy into electrical energy. It is widely used in electric vehicles, smart grids, energy storage, drones, medical equipment, and space satellites. A battery module consists of a battery cell and a module cover, which is connected to the module cover.

[0003] In the related art, a traditional battery includes a battery cell, a tab and a tape. One end of the tab is welded to one end face of the battery cell. The tape is Z-shaped (i.e., Z-shaped tape) and is attached to the battery cell to be glued. To complete the Z-shaped gluing process, the Z-shaped tape is connected to the tab so that the Z-shaped tape covers the welding area between the tab and the battery cell, such as the Chinese patent number CN201811530076.X.

[0004] However, since the Z-shaped tape covers the welding area between the tab and the battery cell, the special shape of the Z-shaped tape makes it easier for the Z-shaped tape to generate uneven stress during the covering process, causing the uneven stress to act more easily on the tab, making the tab more likely to be damaged or torn under the action of the uneven stress, making it easier for connection defects to occur between the battery cell and the tab, and thus making the battery performance poorer. Utility Model Content

[0005] The purpose of the present disclosure is to overcome the deficiencies in the prior art and provide a battery and a battery module with better performance.

[0006] The purpose of this disclosure is achieved through the following technical solutions:

[0007] A battery comprising a winding core, wherein a conductive portion of the winding core extends outside the winding core and is used to be welded to a connecting piece, and the battery further comprises a first tape member and a second tape member;

[0008] The first tape member is respectively adhered to the side wall of the winding core and a portion of the conductive portion of the winding core, and the first tape member and the second tape member jointly cover the outer surface of the conductive portion of the winding core away from the connecting piece;

[0009] The second tape member is adhered to the welding position between the conductive portion of the winding core and the connecting piece, and the second tape member at least abuts against the first tape member.

[0010] In one embodiment, the conductive portion of the battery cell is a tab.

[0011] In one embodiment, the first tape member is bent; and / or,

[0012] The second tape piece is bent.

[0013] In one embodiment, the first tape member includes a first tape body and a first extension portion, the first tape body is adhered to a portion of the conductive portion of the winding core, the first extension portion is adhered to the side wall of the winding core, one end of the first tape body at least abuts against the second tape member, and the other end of the first tape body is connected to the first extension portion.

[0014] In one embodiment, the first tape body and the first extension portion are an integrally formed structure.

[0015] In one embodiment, the second tape member extends to the outer surface of the first tape member; or

[0016] The first tape member extends to an outer surface of the second tape member.

[0017] In one embodiment, one end of the second tape member facing away from the conductive portion of the winding core and the welding portion of the connecting piece at least abuts against the first tape member, and the second tape member is also adhered to a portion of the conductive portion of the winding core.

[0018] In one embodiment, the second tape member includes a second tape body and a second extension portion, the second tape body is adhered to the welding point between the conductive part of the winding core and the connecting piece, the second extension portion is adhered to a part of the conductive part of the winding core, the second tape body is connected to the second extension portion, and the end of the second extension portion facing away from the second tape body at least abuts against the first tape member.

[0019] In one embodiment, the second tape body and the second extension portion are an integrally formed structure.

[0020] A battery module comprises a cover plate, a connecting piece, and the battery described in any of the above embodiments, wherein the connecting piece is welded to the cover plate, the winding core is arranged adjacent to the end face of the cover plate and corresponds to the cover plate, and the conductive part of the winding core is welded to the connecting piece; the end face of the winding core is welded to the bonding surface of the connecting piece.

[0021] Compared with the prior art, the present disclosure has at least the following advantages:

[0022] 1. Since the first tape piece is respectively attached to the side wall of the winding core and a part of the conductive part of the winding core, and the second tape piece is attached to the welding point between the conductive part of the winding core and the connecting piece, the first tape piece and the second tape piece are arranged in sections, completing the segmented adhesive treatment of the battery;

[0023] 2. Since the first tape piece and the second tape piece jointly cover the outer surface of the conductive part of the winding core away from the connecting piece, and the second tape piece at least abuts against the first tape piece, the first tape piece and the second tape piece are in close contact, avoiding a gap between the first tape piece and the second tape piece, solving the problem that the traditional Z-shaped tape is prone to generating uneven stress during the pasting process, and further solving the problem that the tab is prone to damage or tearing under the action of uneven stress, so that the first tape piece and the second tape piece are reliably covered on the tab together to prevent welding metal foreign matter from entering the battery cell and the electrolyte from flushing the diaphragm during injection, causing the battery cell to short-circuit, thereby improving the performance of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present disclosure and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 Schematic diagram of the structure of a battery module according to one embodiment;

[0026] Figure 2 for Figure 1 A structural schematic diagram of the battery module from another perspective;

[0027] Figure 3 for Figure 1 The schematic diagram of the structure of the battery module after the battery segments are glued;

[0028] Figure 4 for Figure 3 An enlarged schematic diagram of point A of the battery module is shown. DETAILED DESCRIPTION

[0029] To facilitate understanding of the present disclosure, a more comprehensive description of the present disclosure will be provided below with reference to the accompanying drawings. The accompanying drawings illustrate preferred embodiments of the present disclosure. However, the present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the disclosure.

[0030] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly attached to the other element or there may be an intermediate element. 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 an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this disclosure pertains. The terms used herein in the specification of this disclosure are intended only to describe specific embodiments and are not intended to limit this disclosure. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0032] The present disclosure provides a battery, including a winding core, wherein a conductive portion of the winding core extends outward from the winding core, and the conductive portion of the winding core is used for welding to a connecting piece.

[0033] Furthermore, the battery also includes a first tape piece and a second tape piece; the first tape piece is respectively adhered to the side wall of the winding core and a part of the conductive part of the winding core, and the first tape piece and the second tape piece jointly cover the outer surface of the conductive part of the winding core away from the connecting piece; the second tape piece is adhered to the welding point between the conductive part of the winding core and the connecting piece, and the second tape piece at least abuts against the first tape piece.

[0034] In the above-mentioned battery, the first tape member is respectively adhered to the side wall of the winding core and a portion of the conductive portion of the winding core, and the second tape member is adhered to the welding point between the conductive portion of the winding core and the connecting piece. Thus, the first tape member and the second tape member are arranged in sections, thereby completing the segmented adhesive application process of the battery.

[0035] Since the first tape piece and the second tape piece jointly cover the outer surface of the conductive part of the winding core away from the connecting piece, and the second tape piece at least abuts against the first tape piece, the first tape piece and the second tape piece are in close contact, avoiding a gap between the first tape piece and the second tape piece, solving the problem that the traditional Z-shaped tape is prone to generating uneven stress during the pasting process, and further solving the problem that the tab is prone to damage or tearing under the action of uneven stress, so that the first tape piece and the second tape piece are reliably covered on the tab together to prevent welding metal foreign matter from entering the battery cell and the electrolyte from flushing the diaphragm during injection, causing the battery cell to short-circuit, thereby improving the battery performance.

[0036] In order to better understand the technical solutions and beneficial effects of the present disclosure, the present disclosure is further described in detail below with reference to specific embodiments:

[0037] like Figures 3 and 4 As shown, a battery 10 a according to an embodiment includes a winding core 100 , wherein a conductive portion 110 of the winding core 100 extends outward from the winding core 100 , and the conductive portion 110 of the winding core 100 is used for welding to the connecting piece 30 a .

[0038] Furthermore, the battery 10a also includes a first tape member 200 and a second tape member 300; the first tape member 200 is respectively adhered to the side wall of the winding core 100 and a portion of the conductive portion 110 of the winding core 100, and the first tape member 200 and the second tape member 300 jointly cover the outer surface of the conductive portion 110 of the winding core 100 facing away from the connecting piece 30a; the second tape member 300 is adhered to the welding point between the conductive portion 110 of the winding core 100 and the connecting piece 30a, and the second tape member 300 at least abuts the first tape member 200.

[0039] In the aforementioned battery 10a, the first tape member 200 is adhered to the sidewall of the winding core 100 and a portion of the conductive portion 110 of the winding core 100, and the second tape member 300 is adhered to the weld between the conductive portion 110 of the winding core 100 and the connecting piece 30a. Thus, the first tape member 200 and the second tape member 300 are arranged in sections, completing the segmented adhesive application process for the battery 10a.

[0040] Since the first tape member 200 and the second tape member 300 jointly cover the outer surface of the conductive portion 110 of the winding core 100 on the side away from the connecting piece 30a, and the second tape member 300 at least abuts against the first tape member 200, the first tape member 200 and the second tape member 300 are in close contact, avoiding the presence of a gap between the first tape member 200 and the second tape member 300, thereby solving the problem that the traditional Z-shaped tape is prone to generating uneven stress during the lamination process, and further solving the problem that the tab is prone to damage or tearing under the action of uneven stress. The first tape member 200 and the second tape member 300 are reliably covered on the tab together to prevent welding metal foreign matter from entering the battery cell and the electrolyte from flushing the diaphragm during liquid injection, causing the battery cell to short-circuit, thereby improving the performance of the battery 10a.

[0041] Furthermore, in this embodiment, the widths of the first tape member 200 and the second tape member 300 are both greater than or equal to the width of the conductive portion 110 of the core 100 , so that the conductive portion of the core is located within both the first tape member and the second tape member.

[0042] like Figures 3 and 4 As shown, in one embodiment, the conductive portion 110 of the winding core 100 is a tab. In this embodiment, the battery 10a has a full tab structure.

[0043] Furthermore, in one embodiment, the conductive portion 100 of the core 100 is welded to one end surface of the core 100 .

[0044] like Figures 3 and 4 As shown, in one embodiment, the first tape member 200 is bent.

[0045] like Figures 3 and 4 As shown, in one embodiment, the second tape member 300 is bent.

[0046] like Figures 3 and 4 As shown, in one embodiment, the first tape member 200 includes a first tape body 210 and a first extension portion 220. The first tape body 210 is adhered to a portion of the conductive portion 110 of the winding core 100, and the first extension portion 220 is adhered to the side wall of the winding core 100. One end of the first tape body 210 at least abuts against the second tape member 300, and the other end of the first tape body 210 is connected to the first extension portion 220.

[0047] In one embodiment, the first tape body 210 and the first extension portion 220 are an integrally formed structure.

[0048] like Figures 3 and 4 As shown, in one embodiment, the second tape member 300 extends to the outer surface of the first tape member 200 so that the second tape member 300 overlaps with the first tape member 200; or,

[0049] The first tape member 200 extends to the outer surface of the second tape member 300 , so that the first tape member 200 and the second tape member 300 are overlapped.

[0050] like Figures 3 and 4 As shown, in one embodiment, one end of the second tape member 300 facing away from the welding point between the conductive portion 110 of the winding core 100 and the connecting piece 30a at least abuts against the first tape member 200, and the second tape member 300 is also adhered to a portion of the conductive portion 110 of the winding core 100.

[0051] like Figures 3 and 4 As shown, in one embodiment, the second tape member 300 includes a second tape body 310 and a second extension portion 320. The second tape body 310 is adhered to the welding point between the conductive portion 110 of the winding core 100 and the connecting piece 30a. The second extension portion 320 is adhered to a portion of the conductive portion 110 of the winding core 100. The second tape body 310 is connected to the second extension portion 320, and the end of the second extension portion 320 facing away from the second tape body 310 at least abuts against the first tape member 200.

[0052] In one embodiment, the second tape body 310 and the second extension portion 320 are an integrally formed structure.

[0053] like Figures 1 to 4As shown, the present disclosure also provides a battery module 10, including a cover plate 20a, a connecting piece 30a and a battery 10a of any of the above embodiments, the connecting piece 30a is welded to the cover plate 20a, the end face of the core 100 adjacent to the cover plate 20a is arranged corresponding to the cover plate 20a, and the conductive part 110 of the core 100 is welded to the connecting piece 30a; the end face of the core 100 and the fitting surface of the connecting piece 30a are welded.

[0054] Compared with the prior art, the present disclosure has at least the following advantages:

[0055] 1. Since the first tape member 200 is adhered to the side wall of the winding core 100 and a portion of the conductive portion 110 of the winding core 100, and the second tape member 300 is adhered to the welding point between the conductive portion 110 of the winding core 100 and the connecting piece 30a, the first tape member 200 and the second tape member 300 are arranged in sections, completing the segmented adhesive application process of the battery 10a.

[0056] 2. Since the first tape member 200 and the second tape member 300 jointly cover the outer surface of the conductive portion 110 of the winding core 100 on the side away from the connecting piece 30a, and the second tape member 300 at least abuts against the first tape member 200, the first tape member 200 and the second tape member 300 are in close contact, avoiding the presence of a gap between the first tape member 200 and the second tape member 300, thereby solving the problem that the traditional Z-shaped tape is prone to generating uneven stress during the lamination process, and further solving the problem that the tab is prone to damage or tearing under the action of uneven stress. The first tape member 200 and the second tape member 300 are reliably covered on the tab together, thereby preventing welding metal foreign matter from entering the battery cell and the electrolyte from flushing the diaphragm during liquid injection, causing the battery cell to short-circuit, thereby improving the performance of the battery 10a.

[0057] The above-described embodiments merely represent several implementation methods of the present disclosure. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the disclosed patent. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the scope of the present disclosure, all of which fall within the scope of protection of the present disclosure. Therefore, the scope of protection of the disclosed patent shall be determined by the appended claims.

Claims

1. A battery comprising a winding core, wherein a conductive portion of the winding core extends outward from the winding core and is used for welding to a connecting piece, characterized in that: The battery further includes a first tape member and a second tape member; The first tape member is respectively adhered to the side wall of the winding core and a portion of the conductive portion of the winding core, and the first tape member and the second tape member jointly cover the outer surface of the conductive portion of the winding core away from the connecting piece; The second tape member is adhered to the welding position between the conductive portion of the winding core and the connecting piece, and the second tape member at least abuts against the first tape member.

2. The battery according to claim 1, characterized in that The conductive part of the winding core is the tab.

3. The battery according to claim 1, characterized in that The first tape piece is bent; and / or, The second tape piece is bent.

4. The battery according to claim 1, characterized in that The first tape member includes a first tape body and a first extension portion, the first tape body is adhered to a part of the conductive part of the winding core, the first extension portion is adhered to the side wall of the winding core, one end of the first tape body at least abuts against the second tape member, and the other end of the first tape body is connected to the first extension portion.

5. The battery according to claim 4, characterized in that The first tape body and the first extension portion are an integrally formed structure.

6. The battery according to claim 1, characterized in that The second tape member extends to the outer surface of the first tape member; or The first tape member extends to an outer surface of the second tape member.

7. The battery according to claim 1, characterized in that One end of the second tape member, which is away from the welding point between the conductive portion of the winding core and the connecting piece, at least abuts against the first tape member, and the second tape member is also adhered to a portion of the conductive portion of the winding core.

8. The battery according to claim 7, characterized in that The second tape piece includes a second tape body and a second extension portion. The second tape body is adhered to the welding point between the conductive part of the winding core and the connecting piece. The second extension portion is adhered to a part of the conductive part of the winding core. The second tape body is connected to the second extension portion. The end of the second extension portion facing away from the second tape body at least abuts against the first tape piece.

9. The battery according to claim 8, characterized in that The second tape body and the second extension portion are an integrally formed structure.

10. A battery module, characterized in that: A battery comprising a cover plate, a connecting piece and any one of claims 1 to 9, wherein the connecting piece is welded to the cover plate, the winding core is arranged adjacent to the end face of the cover plate and corresponds to the cover plate, and the conductive part of the winding core is welded to the connecting piece; the end face of the winding core is welded to the fitting surface of the connecting piece.

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