CN219436091U - Battery cell - Google Patents

Abstract

The utility model relates to the technical field of batteries, and provides a battery, which comprises: a battery lead-out end; the coil core is provided with a first tab area at least one end; a current collector electrically connecting the battery lead-out terminal and the first tab region such that the current collector has a tab connection region and a battery lead-out terminal connection region connected; the battery leading-out end connecting area comprises a first part and a second part, a buffer part is formed between the first part and the second part, the first part is connected with the tab connecting area, and the second part is spaced from the tab connecting area, so that the buffer part can provide buffer for the first part and the second part, and the first part and the second part are broken when the battery is prevented from being vibrated, thereby improving the safe use performance of the battery.

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 area of the winding core needs to be electrically connected with the battery case or the pole through the current collector, and the current collector has a risk of weak local strength due to the structural limitation of the current collector, so that there is a risk of structural failure.

Disclosure of Invention

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

The present utility model provides a battery comprising:

a battery lead-out end;

the coil core is provided with a first tab area at least one end;

a current collector electrically connecting the battery lead-out terminal and the first tab region such that the current collector has a tab connection region and a battery lead-out terminal connection region connected;

the battery leading-out end connecting region comprises a first part and a second part, a buffer part is formed between the first part and the second part, the first part is connected with the tab connecting region, and the second part is spaced from the tab connecting region.

The battery of the embodiment of the utility model comprises a battery leading-out end, a winding core and a current collecting piece, wherein the winding core is electrically connected with the battery leading-out end through the current collecting piece. At least one end of the winding core extends out of the first tab area, and the tab connection area and the battery lead-out end connection area of the current collector are respectively connected with the first tab area and the battery lead-out end. Through setting up battery terminal connection zone into first portion and second portion to be formed with buffer portion between first portion and the second portion, first portion is connected with the utmost point ear connection zone, and the second portion is spaced apart with the utmost point ear connection zone, thereby can make buffer portion can provide the buffering for first portion and second portion, when avoiding the battery to receive the vibration, first portion and second portion take place the fracture, thereby improved the safe handling ability of battery.

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 schematic view showing a structure of a battery according to an exemplary embodiment;

fig. 2 is a partially exploded structural schematic view of a battery according to an exemplary embodiment;

fig. 3 is a schematic view showing the structure of a winding core of a battery according to an exemplary embodiment;

fig. 4 is a schematic structural view illustrating a current collector of a battery according to an exemplary embodiment;

fig. 5 is a schematic cross-sectional structure of a current collector of a battery according to an exemplary embodiment.

The reference numerals are explained as follows:

10. a winding core; 11. a winding core main body; 12. a first tab region; 13. a second ear region; 20. a current collector; 21. a tab connection region; 211. a connection portion; 212. a transition portion; 22. a battery lead-out terminal connection region; 221. a first portion; 222. a second portion; 223. a buffer section; 224. a notch; 30. a battery case; 40. a pole.

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 battery lead-out end; the coil core 10, at least one end of the coil core 10 is provided with a first tab area 12; a current collector 20, the current collector 20 electrically connecting the battery lead-out terminal and the first tab region 12 such that the current collector 20 has a tab connection region 21 and a battery lead-out terminal connection region 22 connected to each other, the tab connection region 21 and the battery lead-out terminal connection region 22 respectively connecting the first tab region 12 and the battery lead-out terminal; the battery terminal connection region 22 includes a first portion 221 and a second portion 222, a buffer portion 223 is formed between the first portion 221 and the second portion 222, the first portion 221 is connected with the tab connection region 21, and the second portion 222 is spaced from the tab connection region 21.

The battery of one embodiment of the present utility model includes a battery terminal, a winding core 10, and a current collector 20, the winding core 10 being electrically connected to the battery terminal through the current collector 20. At least one end of the winding core 10 extends out of the first tab region 12, and a tab connection region 21 and a battery terminal connection region 22 of the current collector 20 are connected to the first tab region 12 and the battery terminal, respectively. By arranging the battery terminal connection region 22 as the first portion 221 and the second portion 222, and forming the buffer portion 223 between the first portion 221 and the second portion 222, the first portion 221 is connected with the tab connection region 21, and the second portion 222 is spaced from the tab connection region 21, so that the buffer portion 223 can provide buffer for the first portion 221 and the second portion 222, and when the battery is prevented from being vibrated, the first portion 221 and the second portion 222 are broken, thereby improving the safe use performance of the battery.

It should be noted that, when the first portion 221 is connected to the tab connection region 21, the tab connection region 21 may also form structural reinforcement on the first portion 221, while the second portion 222 is spaced from the tab connection region 21, and the second portion 222 cannot be reinforced by the tab connection region 21, by forming the buffer portion 223 between the first portion 221 and the second portion 222, when the battery is vibrated, for example, when the winding core 10 pulls the tab connection region 21 through the first tab region 12, the first portion 221 and the second portion 222 are also stressed, and the buffer portion 223 may effectively absorb the external force received due to the buffer portion 223 formed between the first portion 221 and the second portion 222, thereby reducing the risk of breakage of the second portion 222 and improving the safety performance of the current collector 20 to a certain extent.

A buffer portion 223 is formed between the first portion 221 and the second portion 222, i.e., the buffer portion 223 can avoid the first portion 221 and the second portion 222 from directly pulling each other, for example, the buffer portion 223 can be deformed; alternatively, the buffer portion 223 may achieve absorption of the force transmitted from the first portion 221 and the second portion 222 to each other, for example, the buffer portion 223 may be formed by providing a shock absorbing space.

In one embodiment, as shown in fig. 4, a gap 224 is formed between the first portion 221, the buffer portion 223 and the second portion 222, so that the gap 224 can be used as a vibration absorbing space, thereby absorbing the external force applied to the current collector 20, avoiding the risk of breaking the current collector 20, and improving the safety performance of the current collector 20.

A buffer portion 223 is formed between the first portion 221 and the second portion 222, further, a gap 224 is formed between the first portion 221 and the second portion 222, the gap 224 actually forms a space between the first portion 221 and the second portion 222, the risk that the battery lead-out terminal connecting region 22 and the battery lead-out terminal break due to tearing of the first tab region 12 and the tab connecting region 21 in the battery charging and discharging process is avoided, that is, the gap 224 can realize vibration absorption.

In one embodiment, the buffer portion 223 may be of a bent structure, for example, the buffer portion 223 may be substantially W-shaped, thereby enabling the buffer portion 223 to form a buffer, or the buffer portion 223 may be substantially V-shaped, or the buffer portion 223 may be substantially U-shaped, or the like.

In one embodiment, the first portion 221 is a first straight plate segment, the second portion 222 is a second straight plate segment, and the buffer portion 223 is a third straight plate segment, so that not only the structure of the battery terminal connection region 22 can be simplified, but also the connection of the battery terminal connection region 22 and the battery terminal can be conveniently achieved.

The battery terminal connection region 22 and the battery terminal can be welded, the first portion 221 is a first straight plate section, the second portion 222 is a second straight plate section, and the buffer portion 223 is a third straight plate section, so that the battery terminal connection region 22 is smoother, good welding quality between the battery terminal connection region 22 and the battery terminal can be ensured, and connection capability between the battery terminal connection region 22 and the battery terminal is improved.

In one embodiment, as shown in fig. 4, two buffer portions 223 are provided, and two ends of the first portion 221 and two ends of the second portion 222 are respectively connected by the two buffer portions 223, so that the protection effect on the battery terminal connection region 22 can be further improved by the two buffer portions 223, thereby improving the structural safety performance of the current collector 20 and further improving the safety service performance of the battery.

In one embodiment, the width of the first portion 221 is smaller than the width of the second portion 222 in the radial direction of the winding core 10, i.e., the structural strength of the second portion 222 may be greater than that of the first portion 221, and the first portion 221 may be structurally reinforced by the tab connection region 21, which may increase the overall strength of the battery terminal connection region 22 to some extent.

The width of the first portion 221 is smaller than the width of the second portion 222, which may increase the surface flatness of the second portion 222 from a structural fabrication standpoint, and increase the overall strength of the second portion 222 from a structural performance standpoint.

In one embodiment, the ratio of the width of the first portion 221 and the second portion 222 in the same plane to the width of the second portion 222 is 1.2-5, so that not only the structural strength of the second portion 222 can be ensured, but also the overcurrent capacity of the battery terminal connection region 22 can be ensured, thereby improving the safety use performance of the current collector 20.

When the ratio of the width of the first portion 221 to the width of the second portion 222 is too small, current transmission may be blocked, and heat generation inside the battery may be serious; when the ratio of the width of the first portion 221 to the width of the second portion 222 is too large, the structural strength of the second portion 222 may be difficult to be ensured.

As shown in connection with fig. 4 and 5, at least part of the first portion 221 and at least part of the second portion 222 may be in the same plane. The ratio of the width of the first portion 221 in the same plane as the second portion 222 to the width of the second portion 222 may be 1.2, 1.3, 1.4, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 4.8, or 5, etc.

In one embodiment, the width of the buffer portion 223 is smaller than the width of the second portion 222 or the width of the buffer portion 223 is smaller than the width of the first portion 221 along the radial direction of the winding core 10, so that the buffer portion 223 can be used for realizing buffering, ensuring the structural strength of the first portion 221 and the second portion 222, avoiding the problem of structural damage, and improving the safety performance of the battery to a certain extent.

In one embodiment, the width of the buffer portion 223 is 1mm-5mm along the radial direction of the winding core 10, so that not only can the buffer portion 223 absorb vibration be ensured, but also the risk of fusing caused by too small width of the buffer portion 223 can be avoided, and the flatness and structural strength of the first portion 221 and the second portion 222 can be ensured.

The width of the buffer 223 may be 1mm, 1.2mm, 1.5mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 4.8mm, 4.9mm, 5mm, or the like.

In one embodiment, the size of the buffer portion 223 is 1mm-5mm along the circumferential direction of the winding core 10, so that the buffer portion 223 can have enough buffer capacity, and the risk of structural failure caused by overlong buffer portion 223 can be avoided, so that the buffer portion 223 can have reliable overcurrent capacity to a certain extent, further the current collector 20 can have enough overcurrent capacity, and the safe service performance of the battery is improved.

The size of the buffer 223 in the circumferential direction of the winding core 10 may be 1mm, 1.2mm, 1.5mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 4.8mm, 4.9mm, 5mm, or the like.

It should be noted that, the radial direction of the winding core 10 may be considered to extend outward from the center point of the winding core 10, and as shown in fig. 3, the radial direction of the winding core 10 may be denoted as a; while the circumferential direction of the winding core 10 may be regarded as the direction of extension of a circle formed around the circumferential outer surface of the winding core 10, as shown in fig. 3, the circumferential direction of the winding core 10 may be denoted B.

In one embodiment, as shown in fig. 1 and 2, the battery terminal includes a battery case 30 and a post 40, the post 40 is disposed on the battery case 30, and the winding core 10 and the current collector 20 are disposed in the battery case 30; the current collector 20 is electrically connected to the battery case 30 so that the battery case 30 can serve as an electrode output of the first tab region 12.

In one embodiment, the battery terminal includes a battery housing 30 and a post 40, the post 40 is disposed on the battery housing 30, and the winding core 10 and the current collector 20 are disposed within the battery housing 30; the current collector 20 is electrically connected to the post 40 such that the post 40 serves as the electrode output for the first tab region 12.

In one embodiment, as shown in fig. 2 and 4, at least one end of the winding core 10 is provided with a second tab region 13, one of the first tab region 12 and the second tab region 13 is electrically connected with the battery case 30, and the other is electrically connected with the post 40, so that the battery case 30 and the post 40 can be used as two electrode outlets of the battery, thereby facilitating charge and discharge of the battery.

The battery shell 30 is used as one electrode leading-out end of the battery, so that the number of components of the battery can be reduced, and each position of the battery shell 30 can be used as an electric connection position, thereby improving the electric connection selectivity when the batteries are grouped.

In one embodiment, the first tab area 12 and the second tab area 13 extend from the same end of the winding core 10, so that the problem of excessive accumulation of height space caused by the first tab area 12 and the second tab area 13 extending from opposite sides of the winding core main body 11 can be avoided.

As shown in fig. 3, the winding core 10 may include a winding core body 11, a first tab area 12, and a second tab area 13, and the first tab area 12 and the second tab area 13 may extend from the same end of the winding core body 11. One of the first tab region 12 and the second tab region 13 may be copper foil, and the other may be aluminum foil.

It should be noted that, in some embodiments, the first tab area 12 and the second tab area 13 extend from opposite ends of the winding core 10, so that not only the electron transmission path is shortest, the transmission rate is fast, and the heat generation is low, thereby improving the safety performance of the battery.

In one embodiment, the battery terminal connection region 22 is electrically connected with the battery case 30, so that the battery case 30 can be used as one electrode terminal of a battery, and connection of the battery terminal connection region 22 with the battery case 30 can be conveniently accomplished.

The battery terminal connection region 22 and the battery case 30 may be welded or the battery terminal connection region 22 and the battery case 30 may be connected by conductive paste, which is not limited herein.

It should be noted that, one of the first tab area 12 and the second tab area 13 is electrically connected to the battery case 30, and the other is electrically connected to the post 40, for example, the first tab area 12 may be electrically connected to the battery case 30 through the current collector 20, and the second tab area 13 may also be electrically connected to the post 40 through the current collector structure, which is not limited herein.

In one embodiment, the battery case 30 may be a steel case, an aluminum case, a copper case, or a composite metal case.

The current collector 20 may be a metal member, the current collector 20 may be an aluminum material, or the current collector 20 may be a copper material, etc.

The battery terminal connection region 22 has a substantially circular ring-like structure in shape, so that reliable connection of the battery terminal connection region 22 with the battery case 30 can be conveniently achieved. The tab connection region 21 has a fan-shaped structure, so that the tab connection region 21 is electrically connected with the first tab region 12, and the structural form of the tab connection region 21 can be adapted to the structural form of the first tab region 12.

In one embodiment, the battery terminal connection region 22 is disposed around the tab connection region 21, so that the structural strength of the current collector 20 can be ensured, the overcurrent capability of the current collector 20 can be improved, the battery terminal connection region 22 can have a reliable contact area with the battery case 30, and the tab connection region 21 can have a reliable insulation distance from the second tab region 13.

In one embodiment, as shown in fig. 4, the tab connection region 21 includes a connection portion 211 and a transition portion 212, opposite ends of the transition portion 212 are respectively connected with the first portion 221 and the connection portion 211, the connection portion 211 is connected with the first tab region 12, the transition portion 212 can effectively connect the first portion 221 and the connection portion 211, and a certain buffering effect can be achieved, so that the tab connection region 21 is prevented from excessively pulling the first portion 221, and thus the structural performance of the current collector 20 can be effectively improved.

As shown in fig. 5, the tab connection region 21 includes a connection portion 211 and a transition portion 212, the transition portion 212 may connect the first portion 221 and the connection portion 211, the connection portion 211 may include two portions having different thicknesses, and a thickness of a portion of the connection portion 211 connected to the transition portion 212 needs to be greater than that of other portions of the connection portion 211.

It is to be noted that the battery includes a winding core and an electrolyte, and a minimum unit capable of performing an electrochemical reaction such as charge/discharge. The winding core refers to a unit formed by winding or laminating a stacked portion including 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 wound battery, i.e., a first pole piece, a second pole piece opposite in electrical property to the first pole piece, and a separator sheet disposed between the first pole piece and the second pole piece are wound to obtain a wound winding core.

In one embodiment, the battery may be a cylindrical battery, thereby facilitating quick-charge after battery grouping.

In some embodiments, it is not excluded that the battery may be a quadrangular-type battery, and a quadrangular-type battery mainly refers to a prismatic shape, but it is not strictly limited whether each side of the prism is necessarily a strictly defined straight line, and corners between sides are not necessarily right angles, and may be arc transitions.

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

The battery of the battery pack according to one embodiment of the present utility model includes a battery terminal, a winding core 10, and a current collector 20, and the winding core 10 is electrically connected to the battery terminal through the current collector 20. At least one end of the winding core 10 extends out of the first tab region 12, and a tab connection region 21 and a battery terminal connection region 22 of the current collector 20 are connected to the first tab region 12 and the battery terminal, respectively. By arranging the battery terminal connection region 22 as the first portion 221 and the second portion 222, and forming the buffer portion 223 between the first portion 221 and the second portion 222, the first portion 221 is connected with the tab connection region 21, and the second portion 222 is spaced from the tab connection region 21, so that the buffer portion 223 can provide buffer for the first portion 221 and the second portion 222, and when the battery is prevented from being vibrated, the first portion 221 and the second portion 222 are broken, thereby improving the safety 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 (14)

1. A battery, comprising:

a battery lead-out end;

the coil core (10), at least one end of the coil core (10) is provided with a first tab area (12);

a current collector (20), the current collector (20) electrically connecting the battery terminal and the first tab region (12) such that the current collector (20) has a tab connection region (21) and a battery terminal connection region (22) connected;

the battery leading-out end connecting region (22) comprises a first part (221) and a second part (222), a buffer part (223) is formed between the first part (221) and the second part (222), the first part (221) is connected with the tab connecting region (21), and the second part (222) is spaced from the tab connecting region (21).

2. The battery according to claim 1, wherein a gap (224) is formed between the first portion (221), the buffer (223), and the second portion (222).

3. The battery according to claim 2, wherein the first portion (221) is a first straight plate section, the second portion (222) is a second straight plate section, and the buffer (223) is a third straight plate section.

4. The battery according to claim 1, wherein the buffer parts (223) are two, and both ends of the first portion (221) and both ends of the second portion (222) are connected by the two buffer parts (223), respectively.

5. The battery according to claim 1, characterized in that the width of the first portion (221) is smaller than the width of the second portion (222) in the radial direction of the winding core (10).

6. The battery according to claim 5, characterized in that the ratio of the width of the first portion (221) to the width of the second portion (222) in the same plane is 1.2-5.

7. The battery according to claim 5, wherein the width of the buffer (223) is smaller than the width of the second portion (222) or the width of the buffer (223) is smaller than the width of the first portion (221) in the radial direction of the winding core (10).

8. The battery according to claim 7, wherein the width of the buffer portion (223) is 1mm-5mm.

9. The battery according to any one of claims 1 to 8, characterized in that the buffer (223) has a size of 1mm-5mm in the circumferential direction of the winding core (10).

10. The battery according to any one of claims 1 to 8, wherein the battery terminal includes a battery case (30) and a post (40), the post (40) being provided on the battery case (30);

wherein the current collector (20) is electrically connected with the battery case (30), or the current collector (20) is electrically connected with the post (40).

11. The battery according to claim 10, characterized in that at least one end of the winding core (10) is provided with a second tab region (13), one of the first tab region (12) and the second tab region (13) being electrically connected to the battery case (30), the other being electrically connected to the post (40);

the first tab area (12) and the second tab area (13) are arranged at the same end of the winding core (10).

12. The battery according to claim 10, wherein the battery terminal connection region (22) is electrically connected with the battery case (30);

wherein the battery terminal connection region (22) is disposed around the tab connection region (21).

13. The battery according to any one of claims 1 to 8, wherein the tab connection region (21) includes a connection portion (211) and a transition portion (212), opposite ends of the transition portion (212) being connected to the first portion (221) and the connection portion (211), respectively, the connection portion (211) being connected to the first tab region (12).

14. The battery according to any one of claims 1 to 8, wherein the battery is a cylindrical battery.