CN219778943U - Battery cell - Google Patents

Abstract

The utility model relates to the technical field of batteries and provides a battery, which comprises a winding type battery core, wherein the winding type battery core comprises a main body and a first tab extending from one side of the main body, the main body is provided with a central area, the first tab comprises a plurality of tab layers, a first area and a second area are formed on the plurality of tab layers along the central area of the main body in the direction of the outer surface of the main body, the plurality of tab layers are folded along the direction of the central area to form the first tab, a supporting part is arranged between the first area and the main body and used for supporting the folded first area, so that the heights of the tab layers of the first area and the tab layers of the second area are basically consistent, the flatness of the end face of the first tab away from the main body is ensured, the welding of the first tab and an electrode lead-out structure can be facilitated, and the welding quality of the first tab and the electrode lead-out structure is improved, and the safe use performance of the battery is improved.

Description

Battery cell

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery.

Background

In the related art, the tab of the battery core can be formed by bending and folding a plurality of tab layers, and the height of the inner ring tab layer and the outer ring tab layer is not easy to control after lodging, so that the welding quality of the follow-up tab and the current collector can be affected.

Disclosure of Invention

The utility model provides a battery, which is used for improving the service performance of the battery.

The utility model provides a battery, which comprises a winding type battery core, wherein the winding type battery core comprises a main body and a first tab extending from one side of the main body, the main body is provided with a central area, the first tab comprises a plurality of tab layers in the direction from the central area of the main body to the outer surface of the main body, a first area and a second area are formed in the direction from the central area of the main body to the outer surface of the main body, the first area is close to the central area, and the second area is positioned on one side of the first area, which is away from the central area;

the plurality of tab layers are bent and folded along the direction towards the central area to form a first tab, and a supporting part is arranged between the first area and the main body and used for supporting the bent and folded first area.

The battery comprises a winding type battery core, wherein the winding type battery core comprises a main body and a first tab, the first tab is formed by bending and folding a plurality of tab layers along the direction facing the central area in the direction facing the outer surface of the main body, the plurality of tab layers are provided with a first area close to the central area and a second area far away from the central area, and a supporting part is arranged below the first area, so that the supporting part supports the bent and folded first area, the heights of the tab layers of the first area and the tab layers of the second area are basically consistent, the flatness of the end face of the first tab, away from the main body, is ensured, the welding of the first tab and an electrode lead-out structure is facilitated, the welding quality of the first tab and the electrode lead-out structure is improved, and the safe use performance of the battery is improved.

Drawings

For a better understanding of the present disclosure, reference may be made to the embodiments illustrated in the following drawings. The components in the drawings are not necessarily to scale and related elements may be omitted in order to emphasize and clearly illustrate the technical features of the present disclosure. In addition, the relevant elements or components may have different arrangements as known in the art. Furthermore, in the drawings, like reference numerals designate identical or similar parts throughout the several views.

Wherein:

fig. 1 is a partial schematic structure of a battery according to an exemplary embodiment;

fig. 2 is a partial schematic structure of a battery according to an exemplary embodiment;

fig. 3 is a partial schematic structure of a battery according to another exemplary embodiment;

fig. 4 is a partial schematic structure of a winding type cell of a battery according to an exemplary embodiment.

The reference numerals are explained as follows:

10. a coiled electrical core; 11. a main body; 111. a central bore; 112. a groove; 113. a first pole piece layer; 114. a separator layer; 115. a second pole piece layer; 12. a first tab; 121. a tab layer; 122. a first region; 123. a second region; 13. a second lug; 20. an insulating spacer; 21. and a through hole.

Detailed Description

The technical solutions in the exemplary embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings in the exemplary embodiments of the present disclosure. The example embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the present disclosure, and it is therefore to be understood that various modifications and changes may be made to the example embodiments without departing from the scope of the present disclosure.

In the description of the present disclosure, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance unless explicitly specified or limited otherwise; the term "plurality" refers to two or more than two; the term "and/or" includes any and all combinations of one or more of the associated listed items. In particular, references to "the/the" object or "an" object are likewise intended to mean one of a possible plurality of such objects.

Unless specified or indicated otherwise, the terms "connected," "fixed," and the like are to be construed broadly and are, for example, capable of being fixedly connected, detachably connected, or integrally connected, electrically connected, or signally connected; "coupled" may be directly coupled or indirectly coupled through intermediaries. The specific meaning of the terms in the present disclosure may be understood by those skilled in the art according to the specific circumstances.

Further, in the description of the present disclosure, it should be understood that the terms "upper", "lower", "inner", "outer", and the like, as described in the example embodiments of the present disclosure, are described with the angles shown in the drawings, and should not be construed as limiting the example embodiments of the present disclosure. It will also be understood that in the context of an element or feature being connected to another element(s) "upper," "lower," or "inner," "outer," it can be directly connected to the other element(s) "upper," "lower," or "inner," "outer," or indirectly connected to the other element(s) "upper," "lower," or "inner," "outer" via intervening elements.

An embodiment of the present utility model provides a battery, referring to fig. 1 to 4, the battery includes a rolled battery cell 10, the rolled battery cell 10 includes a main body 11 and a first tab 12 extending from one side of the main body 11, the main body 11 has a central region, the first tab 12 includes a plurality of tab layers 121 in a direction from the central region of the main body 11 toward an outer surface of the main body 11, the plurality of tab layers 121 are formed with a first region 122 and a second region 123 in a direction from the central region of the main body 11 toward the outer surface of the main body 11, the first region 122 is disposed near the central region, and the second region 123 is located at one side of the first region 122 facing away from the central region; the tab layers 121 are folded along a direction towards the central area to form the first tab 12, and a supporting portion is disposed between the first area 122 and the main body 11, so as to be used for supporting the folded first area 122.

The battery according to one embodiment of the utility model comprises a winding type battery core 10, the winding type battery core 10 comprises a main body 11 and a first tab 12, the first tab 12 is formed by bending and folding a plurality of tab layers 121 along the direction facing the central area in the direction facing the outer surface of the main body 11, the plurality of tab layers 121 are formed with a first area 122 close to the central area and a second area 123 far away from the central area, a supporting part is arranged below the first area 122, so that the supporting part supports the bent and folded first area 122, the heights of the tab layers 121 of the first area 122 and the tab layers 121 of the second area 123 are basically consistent, the flatness of the end face of the first tab 12 far away from the main body 11 is ensured, the welding of the first tab 12 and an electrode lead-out structure is facilitated, the welding quality of the first tab 12 and the electrode lead-out structure is improved, and the safety use performance of the battery is improved.

It should be noted that, the heights of the tab layer 121 in the first area 122 and the tab layer 121 in the second area 123 are basically consistent, that is, the end surface of the first tab 12 has higher flatness, and the subsequent electrode lead-out structure can reliably contact with the end surface, so as to ensure the contact area between the first tab 12 and the electrode lead-out structure, for example, the electrode lead-out structure may be a current collecting disc, the current collecting disc is welded with the first tab 12, so that not only the connection stability between the current collecting disc and the first tab 12 can be ensured, but also the overcurrent capability between the current collecting disc and the first tab 12 can be ensured. The electrode lead-out structure may also be a post assembly, or the electrode lead-out structure may also be a battery case.

The winding type battery cell 10 may be a cylindrical battery cell, in which case, the central region of the main body 11 is the central hole 111 of the cylindrical battery cell, and the direction of the central region of the main body 11 toward the outer surface of the main body 11 is the radial direction of the main body 11.

Alternatively, the winding type battery cell 10 may be a quadrangular type battery cell, that is, a cylindrical battery cell is flattened, so as to form a quadrangular type battery cell, and at this time, a central area of the main body 11 is an area formed by a central hole of the flattened cylindrical battery cell, and a direction of the central area of the main body 11 toward an outer surface of the main body 11 is a direction perpendicular to a large surface of the winding type battery cell 10.

In one embodiment, the winding type battery cell 10 may be a cylindrical battery cell, the cylindrical battery cell includes a main body 11 and a first tab 12 extending from one side of the main body 11, the first tab 12 includes a plurality of tab layers 121 along a radial direction of the main body 11, the plurality of tab layers 121 are formed with a first region 122 and a second region 123 along the radial direction of the main body 11, the main body 11 is formed with a central hole 111, the first region 122 is disposed around the central hole 111, and the second region 123 is located at one side of the first region 122 facing away from the central hole 111; the tab layers 121 are folded along a direction toward the central hole 111 to form the first tab 12, and a supporting portion is disposed below the first region 122, that is, a supporting portion is disposed between the first region 122 and the main body 11, so as to be used for supporting the folded first region 122.

The winding type battery cell 10 comprises a main body 11 and a first tab 12, the first tab 12 is formed by bending and folding a plurality of tab layers 121 along the direction facing a central hole 111 along the radial direction of the main body 11, a first area 122 close to the central hole 111 and a second area 123 far away from the central hole 111 are formed on the plurality of tab layers 121 along the radial direction of the main body 11, and a supporting part is arranged below the first area 122, so that the supporting part supports the bent and folded first area 122, the heights of the tab layers 121 of the first area 122 and the tab layers 121 of the second area 123 are basically consistent, the flatness of the end face of the first tab 12, away from the main body 11, can be conveniently welded with the electrode lead-out structure, and the welding quality of the first tab 12 and the electrode lead-out structure is improved, and the safe use performance of the battery is improved.

In the related art, the winding type battery core has a central hole 111, which results in inconsistent heights of the outer ring tab and the inner ring tab after lodging, and in the welding process with the current collecting disc, due to inconsistent heights of the tabs, the problem that a hole explosion or poor welding contact of the inner ring tab occurs when the current collecting disc and the inner ring tab are welded, for example, the welding of the inner ring tab cannot affect the battery performance. In this embodiment, the supporting portion is disposed below the first area 122, so as to be used for supporting the folded first area 122, thereby solving the problem of large height difference between the inner and outer ring tabs, effectively solving the problem of welding and fixing the current collecting disc and the tab, and ensuring the overcurrent capability between the current collecting disc and the first tab 12.

In one embodiment, as shown in fig. 1, the supporting portion is an insulating spacer 20, the insulating spacer 20 is independent from the coiled electrical core 10, and the insulating spacer 20 is disposed on the main body 11 to support the first region 122, so as to ensure that the first tab 12 has a reliable flatness.

In the battery mounting process, after the winding-type battery cell 10 is formed by winding, the insulating spacer 20 may be disposed on the main body 11, and then the plurality of tab layers 121 may be folded in a direction toward the central hole 111 to form the first tab 12, and at this time, the insulating spacer 20 forms a support for the first region 122, so that the tab layers 121 of the first region 122 and the tab layers 121 of the second region 123 may be substantially uniform in height.

The insulating spacer 20 may be a plastic spacer, or the insulating spacer 20 may be a rubber spacer, or the insulating spacer 20 may be a conductive spacer having an insulating coating, or the like.

As shown in fig. 1, the plurality of tab layers 121 of the first tab 12 are formed with a first region 122 near the center hole 111 and a second region 123 distant from the center hole 111 in the radial direction of the main body 11.

In one embodiment, as shown in fig. 1, the insulating spacer 20 is provided with a through hole 21, where the through hole 21 may be opposite to the central area, and when the central area is the central hole 111, the through hole 21 is opposite to the central hole 111, so that the overall weight of the insulating spacer 20 can be reduced, and the through hole 21 can be used for circulating electrolyte, so as to improve the wettability of the electrolyte, and further improve the manufacturing efficiency of the battery.

The area of the through hole 21 on the insulating spacer 20 may be equal to the area of the central hole 111, or the area of the through hole 21 may be greater than the area of the central hole 111, or the area of the through hole 21 may be smaller than the area of the central hole 111.

In one embodiment, the thickness of the insulating spacer 20 is 0.03mm-2mm, and on the basis of ensuring that the insulating spacer 20 can form a support for the tab layer 121, the influence of the excessive thickness of the insulating spacer 20 on the overall energy density of the battery can be avoided.

The thickness of the insulating spacer 20 may be 0.03mm, 0.04mm, 0.05mm, 0.1mm, 0.15mm, 0.18mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.2mm, 1.4mm, 1.5mm, 1.8mm, 1.9mm, 2mm, or the like.

In one embodiment, the insulating spacer 20 contacts with the end of the main body 11, so that the main body 11 supports the insulating spacer 20, so that the installation stability of the insulating spacer 20 can be ensured, the insulating spacer 20 can form a reliable support for the tab layer 121, and the end face of the first tab 12 can have higher flatness, so that the subsequent welding of the first tab 12 and the electrode lead-out structure can be facilitated.

In one embodiment, a groove 112 is formed between the side of the first region 122 facing the central region and the end of the body 11, and at least a portion of the insulating spacer 20 is disposed within the groove 112.

As shown in fig. 4, a groove 112 is formed between the end of the main body 11 and the side of the first region 122 facing the central hole 111, and at least a portion of the insulating spacer 20 is disposed in the groove 112, so that not only can the mounting of the insulating spacer 20 be facilitated, but also the reliable positioning of the insulating spacer 20 can be formed, thereby improving the manufacturing efficiency of the battery, and ensuring the stability of the insulating spacer 20.

In one embodiment, the main body 11 includes a first pole piece, a diaphragm, and a second pole piece, the diaphragm is located between the first pole piece and the second pole piece, the first tab 12 extends from the first pole piece, the central area of the main body 11 faces the direction of the outer surface of the main body 11, for example, the central area is a central hole 111, that is, in the radial direction of the main body 11, the first pole piece is formed with a plurality of first pole piece layers 113, the number of tab layers 121 is smaller than that of the first pole piece layers 113, and at least one first pole piece layer 113, close to the central area, of the plurality of first pole piece layers 113 does not extend out of the tab layers 121 to form a groove 112, so that the insulating spacer 20 can be installed in the groove 112, installation stability of the insulating spacer 20 is improved, and reliable support of the insulating spacer 20 on the tab layers 121 is ensured.

The main body 11 includes a first pole piece, a diaphragm, and a second pole piece, the diaphragm is located between the first pole piece and the second pole piece, the first tab 12 extends from the first pole piece, and the winding type battery cell 10 can be formed by winding the first pole piece, the diaphragm, and the second pole piece.

By making at least one first pole piece layer 113 of the plurality of first pole piece layers 113 close to the central hole 111 not extend out of the tab layer 121, that is, during the winding process of the winding type battery cell 10, the first pole piece which is wound first may not extend out of the tab layer 121, so that after the winding of the winding type battery cell 10 is completed, the portion where the tab layer 121 does not extend out may form the groove 112.

The first pole piece is formed with a plurality of first pole piece layers 113, the diaphragm comprises a plurality of diaphragm layers 114, the second pole piece is formed with a plurality of second pole piece layers 115, at least one first pole piece layer 113 close to the center hole 111 in the plurality of first pole piece layers 113 is not extended with a pole lug layer 121, and the left first pole piece layer 113 is not extended with a pole lug layer 121 as shown in fig. 2.

In one embodiment, the main body 11 includes a first pole piece, a diaphragm, and a second pole piece, the diaphragm is located between the first pole piece and the second pole piece, the diaphragm is located in a direction from a central area of the main body 11 towards an outer surface of the main body 11, the diaphragm includes a plurality of diaphragm layers 114, an inner ring portion and an outer ring portion are formed on the plurality of diaphragm layers 114 along the direction from the central area of the main body 11 towards the outer surface of the main body 11, for example, the central area is a central hole 111, that is, along a radial direction of the main body 11, the diaphragm includes a plurality of diaphragm layers 114, an inner ring portion and an outer ring portion are formed on the plurality of diaphragm layers 114 along the radial direction of the main body 11, along a height direction of the main body 11, the height of the inner ring portion is greater than the height of the outer ring portion, and the support portion is the inner ring portion, so that the inner ring portion formed by the diaphragm layers 114 can support the tab layer 121, and the tab layer 121 of the first area 122 and the tab layer 121 of the second area 123 are substantially consistent, thereby ensuring flatness of the end face of the first tab 12.

As shown in fig. 3, the first pole piece is formed with a plurality of first pole piece layers 113, the diaphragm includes a plurality of diaphragm layers 114, the second pole piece is formed with a plurality of second pole piece layers 115, the plurality of diaphragm layers 114 are formed with an inner ring portion and an outer ring portion along the radial direction of the main body 11, and the diaphragm layer 114 of the inner ring portion is higher than the diaphragm layer 114 of the outer ring portion, so that the diaphragm layer 114 of the inner ring portion can form a supporting portion, thereby realizing the support of the tab layer 121.

In one embodiment, the difference between the height of the inner ring portion and the height of the outer ring portion is 0.5mm-8mm, so that the separator layer 114 of the inner ring portion can effectively form a supporting portion, reliable supporting of the tab layer 121 is achieved, and safe use performance of the battery is improved.

The height difference of the inner ring portion and the outer ring portion may be 0.5mm, 0.8mm, 1mm, 1.2mm, 1.5mm, 1.8mm, 2mm, 2.2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm or 8mm, etc.

In one embodiment, the heights of the tab layers 121 after being straightened are identical along the height direction of the main body 11, so that the forming of the tab layers 121 can be facilitated, the manufacturing efficiency of the winding type battery cell 10 can be improved, and the manufacturing efficiency of the battery can be improved.

As shown in connection with fig. 2 and 3, the height direction of the main body 11 may be denoted as B.

In one embodiment, as shown in fig. 1 and 4, the coiled electrical core 10 further includes a second tab 13, and the first tab 12 and the second tab 13 with opposite polarities extend from the same side of the main body 11, so that the height space utilization of the battery can be effectively improved, and the overall height of the battery can be reduced, thereby improving the energy density of the battery.

The specific structure of the second tab 13 is not limited herein, and the structure of the second tab 13 may be similar to that of the first tab 12, for example, the second tab 13 may also be supported by a support portion. The first tab 12 and the second tab 13 may be supported by the same support portion.

In one embodiment, the first tab 12 and the second tab 13, which are opposite in polarity, may extend from opposite sides of the body 11.

The battery includes a cell and an electrolyte, and is a minimum unit capable of performing an electrochemical reaction such as charge/discharge. The battery cell refers to a unit formed by winding or laminating a stacked portion, wherein the stacked portion comprises a first pole piece, a separator and a second pole piece. When the first pole piece is a positive pole piece, the second pole piece is a negative pole piece. Wherein the polarities of the first pole piece and the second pole piece can be interchanged. The first and second pole pieces are coated with an active substance.

The battery may be a cylindrical battery, or the battery may be a hexagonal-prism-type battery. And winding the first pole piece, the second pole piece opposite to the first pole piece and the diaphragm arranged between the first pole piece and the second pole piece to obtain the winding type battery cell.

In certain embodiments, the battery may be a quadrangular type battery.

An embodiment of the present utility model also provides a battery pack including the above battery.

The battery of the battery pack according to an embodiment of the utility model includes a rolled battery core 10, the rolled battery core 10 includes a main body 11 and a first tab 12, the first tab 12 is formed by bending and folding a plurality of tab layers 121 along a direction facing the central area in a direction facing the outer surface of the main body 11, the plurality of tab layers 121 are formed with a first area 122 close to the central area and a second area 123 far away from the central area, and a supporting part is arranged below the first area 122, so that the supporting part supports the bent and folded first area 122, thereby ensuring that the heights of the tab layers 121 of the first area 122 and the tab layers 121 of the second area 123 are basically consistent, thereby ensuring the flatness of the end surface of the first tab 12 far away from the main body 11, thereby facilitating the welding of the first tab 12 and an electrode lead-out structure, and improving the welding quality of the first tab 12 and the electrode lead-out structure, thereby improving the safety use performance of the battery pack.

In one embodiment, the battery pack is a battery module or a battery pack.

The battery module comprises a plurality of batteries, the battery module can further comprise a bracket, and the batteries can be fixed on the bracket.

The battery pack comprises a plurality of batteries and a box body, wherein the box body is used for fixing the plurality of batteries.

It should be noted that the battery pack includes a plurality of batteries, and a plurality of batteries are disposed in the case. Wherein, a plurality of batteries can be installed in the box after forming the battery module. Or, a plurality of batteries can be directly arranged in the box body, namely, the plurality of batteries do not need to be grouped, and the plurality of batteries are fixed by the box body.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the utility model disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the utility model following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. The specification and example embodiments are to be considered exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

It is to be understood that the present disclosure is not limited to the precise arrangements and instrumentalities shown in the drawings, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims (12)

1. A battery comprising a rolled cell (10), the rolled cell (10) comprising a main body (11) and a first tab (12) extending from one side of the main body (11), the main body (11) having a central region, the first tab (12) comprising a plurality of tab layers (121) in a direction from the central region of the main body (11) towards the outer surface of the main body (11), a plurality of tab layers (121) being formed with a first region (122) and a second region (123) in a direction from the central region of the main body (11) towards the outer surface of the main body (11), the first region (122) being disposed adjacent to the central region, the second region (123) being located on a side of the first region (122) facing away from the central region;

the tab layers (121) are folded along the direction towards the central area to form the first tab (12), and a supporting part is arranged between the first area (122) and the main body (11) and used for supporting the folded first area (122).

2. The battery according to claim 1, wherein the wound cell (10) is a cylindrical cell, the central region is a central hole (111), the direction of the central region of the main body (11) toward the outer surface of the main body (11) is the radial direction of the main body (11), and the first region (122) is disposed around the central hole (111).

3. The battery according to claim 1 or 2, characterized in that the support is an insulating spacer (20).

4. A battery according to claim 3, characterized in that the insulating spacer (20) is provided with a through hole (21), the through hole (21) being arranged opposite the central area.

5. A battery according to claim 3, characterized in that the thickness of the insulating spacer (20) is 0.03mm-2mm.

6. A battery according to claim 3, characterized in that the insulating spacer (20) is in contact with the end of the main body (11) so that the main body (11) supports the insulating spacer (20).

7. The battery according to claim 6, characterized in that a groove (112) is formed between the side of the first region (122) facing the central region and the end of the main body (11), at least part of the insulating spacer (20) being arranged in the groove (112).

8. The battery according to claim 7, wherein the body (11) comprises a first pole piece, a membrane and a second pole piece, the membrane is located between the first pole piece and the second pole piece, the first tab (12) extends from the first pole piece, a plurality of first pole piece layers (113) are formed on the first pole piece in a direction from a central area of the body (11) towards an outer surface of the body (11), the number of tab layers (121) is smaller than the number of first pole piece layers (113), and the tab layers (121) do not extend from at least one first pole piece layer (113) close to the central area among the plurality of first pole piece layers (113) for forming the groove (112).

9. The battery according to claim 1 or 2, characterized in that the main body (11) comprises a first pole piece, a diaphragm and a second pole piece, the diaphragm is located between the first pole piece and the second pole piece, the diaphragm is located in a direction from a central area of the main body (11) toward an outer surface of the main body (11), the diaphragm comprises a plurality of diaphragm layers (114), an inner ring portion and an outer ring portion are formed in a direction from the central area of the main body (11) toward the outer surface of the main body (11), a height of the inner ring portion is larger than a height of the outer ring portion in a height direction of the main body (11), and the support is the inner ring portion.

10. The battery of claim 9, wherein a difference in height between the inner ring portion and the outer ring portion is 0.5mm-8mm.

11. The battery according to claim 1 or 2, characterized in that the winding cell (10) further comprises a second tab (13), the first tab (12) and the second tab (13) of opposite polarity extending from the same side of the body (11).

12. The battery according to claim 1 or 2, wherein the battery is a cylindrical battery.