CN115911774A

CN115911774A - Battery monomer and consumer

Info

Publication number: CN115911774A
Application number: CN202310089318.0A
Authority: CN
Inventors: 罗金树
Original assignee: Xiamen Hithium Energy Storage Technology Co Ltd
Current assignee: Xiamen Hithium Energy Storage Technology Co Ltd
Priority date: 2023-02-08
Filing date: 2023-02-08
Publication date: 2023-04-04
Anticipated expiration: 2043-02-08

Abstract

The invention discloses a battery monomer and electric equipment. The battery cell includes: the winding type electrode assembly is formed by winding a pole piece and a diaphragm which are arranged in a laminated mode, the pole piece comprises a main body part, the main body part comprises two opposite first sides and second sides connected between the two first sides, each second side comprises a first subsection, the pole piece comprises a plurality of first pole lugs arranged on the first subsection, and each first pole lug comprises a first portion arranged in the axial direction of the winding type electrode assembly in an extending mode; and a current collecting member located at one axial end of the wound electrode assembly, the current collecting member having an outer circumferential surface and being coupled to the first portion of the first tab, or the current collecting member having an inner circumferential surface and being coupled to the first portion of the first tab. According to the battery cell, the first tab extends along the axial direction of the winding type electrode assembly, metal scraps are not easy to generate, the diaphragm is not easy to be damaged, and the safety is improved.

Description

Battery monomer and consumer

Technical Field

The invention relates to the technical field of secondary batteries, in particular to a battery monomer and electric equipment.

Background

In the prior art, the tabs of the secondary battery are generally formed on the end surfaces of the wound electrode assembly in a way of flattening the end surfaces or in a way of falling the end surfaces, and are welded with the current collecting piece on the end surfaces of the wound electrode assembly.

However, in the end face flattening mode, when the flattening wheel is used for flattening the pole lug, metal fragments are easy to generate and are not easy to remove, and the short circuit and self-discharge of the battery are easy to cause; in the lodging scheme, because the tab layer is thin, the tab is easy to be damaged when the tab is connected, even a diaphragm is damaged, and the short circuit and self-discharge of the secondary battery are easy to cause.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the battery monomer provided by the invention has the advantages that metal scraps are not easy to generate during the processing of the pole lug, the diaphragm is not easy to be damaged, and the safety is improved.

The invention also aims to provide electric equipment with the battery cell.

A battery cell according to an embodiment of the first aspect of the invention includes: the winding type electrode assembly is formed by winding a pole piece and a diaphragm which are arranged in a laminated mode, the pole piece comprises a main body part, the main body part comprises two opposite first sides and a second side connected between the two first sides, each second side comprises a first subsection, the pole piece comprises a plurality of first pole lugs arranged on the first subsections, and each first pole lug comprises a first part arranged along the axial direction of the winding type electrode assembly in an extending mode; a current collecting member at one axial end of the wound electrode assembly, the current collecting member having an outer circumferential surface and being coupled to the first portion of the first tab, or the current collecting member having an inner circumferential surface and being coupled to the first portion of the first tab.

According to the single battery, the winding type electrode assembly is equivalent to a column section and a leading-out section which are distributed along the axial direction, the coating area of the pole piece and the diaphragm are positioned on the column section, and the first pole ear of the pole piece is positioned on the leading-out section. The first tab is axially arranged at least in the first part at the lead-out section, and the first tab does not need to be laid down to the end face. First utmost point ear is difficult for producing metal piece in the plastic process, even there is metal piece, because first utmost point ear no longer falls down the piece and clears away easily. The connection position of first utmost point ear has avoided the column segment of coiling formula electrode subassembly, just also can avoid the diaphragm, and difficult damage diaphragm during the connection has improved the free safety in utilization of battery. The current collecting piece is connected with the first pole lug for conduction, so that the connection reliability of the current collecting piece and the first pole lug is high through connection, and the conductivity can be guaranteed. And the first tab is connected to the inner circumferential surface or the outer circumferential surface of the current collecting piece, so that the connection area is large, the resistance is favorably reduced, and the power consumption is reduced.

In some embodiments, the area where the first sub-segment is located is a first annular area, the area where the first portion of the first tab is located is a second annular area, the radial width of the first annular area is greater than the radial width of the second annular area, and the radial width of the annular area is half of the difference between the outer diameter and the inner diameter of the annular area. That is to say, with at least part of first utmost point ear along radially flattening in the second ring district, make first utmost point ear arrange more densely, conveniently improve connection quality.

In some embodiments, the two first edges of the pole piece are a first inner edge and a first outer edge, respectively, the first inner edge being located at the innermost layer of the wound electrode assembly, and the first outer edge being located at the outermost layer of the wound electrode assembly; each second edge further comprises a second subsection, the second subsection is connected with the first inner edge, and the first subsection is connected with the first outer edge. Therefore, in the leading-out section of the winding type electrode assembly, the first tab is not arranged in the central area of the leading-out section, so that a space is reserved. The space can be used flexibly as desired, for example it can be used for accommodating other parts, such as a collector, a support mentioned below, etc. Or the space may form a flow path for moisture and electrolyte.

In some embodiments, the size of the first tab in the direction from the first inner edge to the first outer edge is the width of the first tab, and the widths of the plurality of first tabs gradually increase in the direction from the first inner edge to the first outer edge. Therefore, when the first tab is shaped, the first tab with the small curvature radius is small in width, and the first tab with the large curvature radius is large in width, so that the first tab at different positions is kept consistent in load during shaping. And the larger the diameter is, the larger the width of the first tab is, so that the reshaping efficiency is improved.

In some embodiments, the pole piece further comprises a second tab disposed along the second edge, the first tab being connected to the second tab. That is, the tabs are not coated with an active layer along the second edge, where a second tab is formed that may or may not be selectively in contact with the current collector. The second tab can support the parts in the central area of the leading-out section, so that the connection between the current collecting piece and the first tab is facilitated.

In some embodiments, the current collector includes a current collecting plate, and the first tab is attached to an outer circumferential surface of the current collecting plate. The whole collector plate is an electric conductor, so that the collector plate has high structural strength, strong deformation resistance and simpler assembly.

In other embodiments, the current collector includes a cylindrical current collector ring, and the first tab is attached to an outer or inner circumferential surface of the current collector ring. By arranging the collectors as collector rings, a central region of the collector can be freed for the installation of further components or for flow through.

In still other embodiments, the manifold includes a manifold cover, the manifold cover includes a cover plate and a ring-shaped side plate, the cover plate is connected to one end of the side plate; the first tab is connected to the outer circumferential surface or the inner circumferential surface of the side plate of the current collecting cover, and the cover plate is located at one end of the side plate, which is far away from the winding type electrode assembly. Through the arrangement of the current collecting cover, the connection position of the current collecting piece and the first tab is flexible, and the inner circumferential surface and the outer circumferential surface of the side plate can be selected. The flow collecting cover can improve the strength of the whole structure by arranging the cover plate, and is convenient for connecting the flow collecting piece with other parts (such as a terminal and an end cover).

Optionally, at least one of the cover plate and the side plate is provided with a lightening hole. The weight can be reduced by the arrangement of the lightening holes. In some embodiments, at least part of the lightening holes are through holes, which is beneficial to forming a flow path for water vapor and electrolyte.

In some embodiments, the battery cell further comprises: an insulating support located at one axial end of the wound electrode assembly, the support abutting against the second edge of the pole piece, the first portion of the first tab being located radially outward of the support; at least a portion of the current collector is located between the support and the first portion, or at least a portion of the current collector is located radially outward of the first portion. The support piece is arranged, welding with the pole lug is not needed, and a supporting effect on the first pole lug and the current collecting piece is provided.

Specifically, the battery cell further includes: an end cap positioned on a side of the current collector remote from the wound electrode assembly, the end cap being connected to the current collector; or an insulating part is arranged between the end cover and the current collecting piece, and a terminal on the end cover penetrates through the insulating part and is connected with the current collecting piece. With the mass flow piece so be connected with the end cover, the integrated level is high, has improved assembly efficiency.

In some embodiments, the first tab further includes a second portion connected between the first portion and the body portion, the second portion being disposed to extend in a radial direction of the wound electrode assembly. Therefore, the second part can be tightly attached to the column section part of the wound electrode assembly, and the first parts of the plurality of first tabs can be conveniently attached.

The electric device according to the second aspect of the present invention includes the battery cell in the above embodiments, and the battery cell supplies power to the electric device. According to the electric equipment provided by the embodiment of the invention, the use safety of the electric equipment is improved by adopting the single battery.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

FIG. 1 is a schematic structural view of a wound electrode assembly with current collectors and supports according to some embodiments of the present invention;

FIG. 2 is an expanded view of a coiled electrode assembly according to some embodiments of the invention;

FIG. 3 is an expanded view of a pole piece of further embodiments of the present invention;

FIG. 4 is a schematic view of the coiled electrode assembly of some embodiments of the present invention in the first annular region and the second annular region;

fig. 5 is a plan view of a lead out section of a wound electrode assembly according to an embodiment of the present invention when a first tab is not shaped;

fig. 6 is a cross-sectional view of a lead out section of a wound electrode assembly according to an embodiment of the present invention when a first tab is not shaped;

FIG. 7 is a top view of one way of shaping the lead-out section of a wound electrode assembly in accordance with an embodiment of the present invention;

FIG. 8 is a cross-sectional view of one way of shaping the lead-out section of a coiled electrode assembly according to an embodiment of the invention;

fig. 9 is a top view of one manner of assembling the lead out section and current collector of a wound electrode assembly according to an embodiment of the present invention;

fig. 10 is a cross-sectional view of one manner of assembling the lead-out section and the current collector of the wound electrode assembly according to the embodiment of the present invention;

FIG. 11 is a top view of another way of shaping the lead-out section of a wound electrode assembly according to an embodiment of the present invention;

FIG. 12 is a cross-sectional view of another way of shaping the lead-out section of a coiled electrode assembly according to an embodiment of the invention;

FIG. 13 is a top view of yet another way of reshaping the lead-out section of a wound electrode assembly in accordance with an embodiment of the invention;

FIG. 14 is a cross-sectional view of yet another way of shaping the lead-out section of a coiled electrode assembly according to an embodiment of the invention;

FIG. 15 is a top view of one manner of assembling the lead out section with the current collector and support of a wound electrode assembly in accordance with an embodiment of the present invention;

fig. 16 is a cross-sectional view of one assembly of a lead out section with a current collector, support of a wound electrode assembly in accordance with an embodiment of the present invention;

fig. 17 is a cross-sectional view of another assembly of the lead out section with current collector and support of a wound electrode assembly in accordance with an embodiment of the present invention;

fig. 18 is a cross-sectional view of yet another assembly of the lead out section with the current collector and support of the wound electrode assembly in accordance with an embodiment of the present invention;

fig. 19 is a block diagram of a manifold cap according to an embodiment of the present invention;

fig. 20 is a top view of another manifold cap according to an embodiment of the present invention;

fig. 21 is a top view of yet another manifold cap in accordance with an embodiment of the present invention;

fig. 22 is a top view of yet another manifold cover according to an embodiment of the present invention;

fig. 23 is a side view of a manifold cover according to an embodiment of the present invention;

fig. 24 is a side view of another manifold cover according to an embodiment of the present invention;

fig. 25 is a block diagram of an assembly of a manifold cap and end cap according to an embodiment of the present invention;

fig. 26 is another assembled block diagram of a manifold cap and end cap according to an embodiment of the present invention;

fig. 27 is a schematic diagram of a battery cell according to an embodiment of the invention;

FIG. 28 is a schematic illustration of an energy storage device according to an embodiment of the invention;

fig. 29 is a schematic diagram of a powered device according to an embodiment of the invention.

Reference numerals:

a battery cell 100,

Wound electrode assembly 1, pole piece 11, body 111,

A first tab 112, a width L1 of the first tab, a first portion 112a, a second portion 112b,

Second pole ear 113, pitch 114, axis U,

A first edge 11a, a first inner edge 11a1, a first outer edge 11a2,

A second edge 11b, a first subsection 11b1, a second subsection 11b2,

A first annular region Q1, a radial width w1 of the first annular region, an inner diameter d11 of the first annular region Q1, an outer diameter d12 of the first annular region Q1, a second annular region Q2, a radial width w2 of the second annular region, an inner diameter e21 of the second annular region Q2, an outer diameter e22 of the second annular region Q2,

A column section 101, a lead-out section 102,

A diaphragm 15,

Collector 2, collector plate 21, collector ring 22, collector cap 23, cover plate 231, side plate 232, lightening hole 233, welding zone 234,

A support member 3,

End cap 4, terminal 41,

An insulating member 5,

A shell 108,

Energy storage device 1000, consumer 2000.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

The following disclosure provides many different embodiments, or examples, for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize the applicability of other processes and/or the use of other materials.

The battery cell 100 and the electric device 2000 according to the embodiment of the present invention are described below with reference to the accompanying drawings.

As shown in fig. 27, a battery cell 100 according to an embodiment of the present invention includes: a housing 108 and a wound electrode assembly 1, wherein the housing 108 has a cavity therein, and the housing 108 has an opening. The wound electrode assembly 1 may be placed in the receiving cavity through the opening, which may be closed by the end cap 4.

Referring to fig. 1 and 2, a battery cell 100 according to an embodiment of the first aspect of the present invention includes a wound electrode assembly 1 and a current collector 2, the wound electrode assembly 1 being formed by winding a pole piece 11 and a separator 15 that are stacked. The pole piece 11 includes a main body portion 111, the main body portion 111 includes two opposite first sides 11a and a second side 11b connected between the two first sides 11a, each second side 11b includes a first subsection 11b1, the pole piece 11 further includes a plurality of first tabs 112 disposed on the first subsection 11b1, the plurality of first tabs 112 are sequentially distributed at intervals along a length direction of the first subsection 11b1, and the first tabs 112 include first portions 112a disposed along an axial extension direction of the wound electrode assembly 1.

That is, the wound electrode assembly 1 corresponds to the column section 101 and the lead section 102 that are distributed in the axial direction, the main body 111 of the pole piece 11 and the separator 15 are located in the column section 101, and the tab on the pole piece 11 is located in the lead section 102. The battery cell 100 needs to be connected to other parts (such as the current collector 2, the housing 108 of the battery cell 100, and the end cap 4) by welding at the lead-out section 102.

As shown in fig. 2, the wound electrode assembly 1 is in an expanded state, and the wound electrode assembly 1 includes a pole piece 11 and a separator 15 which are stacked. Usually, the pole pieces 11 and the diaphragm 15 are respectively sheet-shaped as a whole, and the pole pieces 11 of different layers are separated by the diaphragm 15 after winding.

Specifically, since the pole piece 11 includes the main body 111 and the active material is provided on the main body 111, the region of the main body 111 of the pole piece 11 having the active material may be referred to as a coating region, and the portion of the pole piece 11 not having the active material may be referred to as a tab. The pole piece 11 is generally at least two pieces, namely a positive pole piece and a negative pole piece, which are respectively provided with a positive active material and a negative active material. The wound electrode assembly 1 may have a cylindrical shape formed by stacking and winding two or more electrode sheets 11, for example, two, four, five, six, or the like.

The pole piece 11 is generally in a shape of a long strip, two sides of the pole piece 11 are called as a first side 11a, and the other two sides are called as a second side 11b. At least one of the second sides 11b is connected with a first tab 112, and the first tabs 112 are arranged at intervals along the length direction of the second sides 11b.

For convenience of description, the gap between two adjacent first tabs 112 on the pole piece 11 is referred to as a space 114, that is, the first tabs 112 and the space 114 are alternately arranged on the second side 11b. The portion of the second side 11b on which the alternating first tabs 112 and spacings 114 are provided is referred to as the first subsection 11b1. As shown in fig. 2, the second side 11b may have alternating first tabs 112 and spaces 114 throughout. As also shown in fig. 3, the second side 11b may be provided with alternating first tabs 112 and spaces 114 only in sections, which are referred to as first subsections 11b1. And the other part, for the sake of distinction, referred to as the second subsection 11b2.

It should be added here that the processing of the first tab 112 on the pole piece 11 may be to cut the first tab 112 first, and then to superpose and wind the pole piece 11 and the diaphragm 15. The first tab 112 may be cut from the pole piece 11 by first winding the pole piece 11 and the separator 15 in a stacked manner and then cutting the wound electrode assembly 1.

The first tabs 112 are located at the lead-out section 102 for connecting with the current collecting element 2 or other parts, the first tabs 112 are multiple, when the pole piece 11 is unfolded, as shown in fig. 2 and 3, the multiple first tabs 112 are sequentially arranged at intervals along the length direction of the second side 11b, after winding, as shown in fig. 4, the multiple first tabs 112 are distributed in the circumferential direction of the wound electrode assembly 1, the first tabs 112 may be uniformly distributed on each layer, or may be randomly distributed on multiple layers, the multiple first tabs 112 may be distributed at intervals along the circumferential direction of the wound electrode assembly 1, or may be sequentially distributed in the radial direction of the wound electrode assembly 1.

Referring to fig. 1, the current collector 2 is located at one axial end of the wound electrode assembly 1, and the outer or inner circumferential surface of the current collector 2 is coupled to the first portion 112a of the first tab 112. The battery cell 100 is electrically connected to the first portion 112a of the first tab 112 via the current collector 2, so that electrical conductivity can be ensured. The first portion 112a of the first tab 112 is connected to the inner or outer circumferential surface of the current collector 2, and therefore, the contact area is large, the resistance is low, and the power consumption is low.

According to the battery cell 100, the first part 112a of the first tab 112 extends along the axial direction on the leading-out section 102, and metal chips are not easily generated in the shaping process of the first tab 112. Even with metal debris, the debris is relatively easy to remove because the first tab 112 is no longer totally lodged. The connection position of the first tab 112 avoids the column section 101 of the wound electrode assembly 1, and also can avoid the diaphragm 15, so that the diaphragm 15 is not easy to damage during connection, and the use safety of the battery cell 100 is improved.

In some embodiments, as shown in fig. 4, the first subsection 11b1 is located in a first annular region Q1, the first portion 112a of the first tab 112 is located in a second annular region Q2, a radial width W1 of the first annular region Q1 is greater than a radial width W2 of the second annular region Q2, and the radial width of the annular region is half of a difference between an outer diameter and an inner diameter of the annular region.

Specifically, as shown in fig. 4, the first sub-segment 11b1 is located in a first annular region Q1, the inner diameter of the first annular region Q1 is d11, the outer diameter of the first annular region Q1 is d12, and the radial width W1= (d 12-d 11)/2 of the first annular region Q1. The area where the first portion 112a of the first tab 112 is located is a second annular ring zone Q2, the inner diameter of the second annular ring zone Q2 is e21, the outer diameter of the second annular ring zone Q2 is e22, and the radial width W2= (e 22-e 21)/2 of the second annular ring zone Q2.

That is, the first tab 112 needs to be radially shaped after the winding of the wound electrode assembly 1 is completed. If not shaped, the second annular region Q2 of the first tab 112 in the area of the first portion 112a should coincide with the first annular region Q1 of the first subsection 11b1. However, by shaping the first tab 112 in the radial direction, the plurality of first tabs 112 can be made more dense in the radial direction, and the second annular area Q2 occupied by the first portion 112a of the first tab 112 is reduced.

And the first part 112a of the first tab 112 is flattened in the second circular ring area Q2 along the radial direction, so that the first part 112a of the first tab 112 is arranged more densely, thereby being beneficial to reducing cold joint and improving the connection quality. In addition, the first part 112a of the first tab 112 is arranged more densely, which is beneficial to improving the strength of the whole structure, and can leave a space for circulation or assembling other parts, thereby improving the energy density.

A partial process of the battery cell 100 will be described below with reference to fig. 5-10, and it can be further understood how the first tab 112 is shaped to facilitate assembly.

Fig. 5 and 6 show the state of the lead-out section 102 of the coiled electrode assembly 1 when the coiled electrode assembly 1 has not been reshaped in one embodiment. The pole piece 11 is wound to form a multi-layer structure, and a first tab 112 is disposed on a first subsection 11b1 of a second side 11b of the pole piece 11. When the electrode tab is not shaped, the entire first tab 112 is the first portion 112a, that is, the entire first tab 112 is disposed along the axial extension of the wound electrode assembly 1, and the first annular region Q1 occupied by the first subsection 11b1 is overlapped with the second annular region Q2 where the first portion 112a of the first tab 112 is located.

Fig. 7 and 8 show the state of the lead-out section 102 of the wound electrode assembly 1 after the wound electrode assembly 1 is shaped in this embodiment. In this case, the first tab 112 is pressed and reshaped toward the outer edge of the second annular ring region Q2, which causes local deformation of at least a portion of the first tab 112. As shown in fig. 8, it has a length flattened at the end portion referred to as a second portion 112b, and the second portion 112b is arranged to extend in the radial direction of the wound electrode assembly 1. And a further length extending in the axial direction of the wound electrode assembly 1 is referred to as a first portion 112a. The first tab 112, which is not deformed entirely, is a first portion 112a extending axially. Therefore, the second annular region Q2 occupied by the first part 112a of the first tab 112 becomes smaller, the first tab 112 in the inner and outer layers is more densely arranged, and w2< w1. After the electrode assembly is compact, the first portion 112a of the first tab 112 is stably extended along the axial direction of the wound electrode assembly 1, and the first portion 112a is not easy to collapse, soften and deform due to vibration during subsequent assembly, so that the overall assembly quality is conveniently improved. For example, the first portion 112a of the first tab 112 is not easily softened and deformed to cause cold joint when subsequently welded.

Fig. 9 and 10 show the connection state of the wound electrode assembly 1 and the current collector 2 after the wound electrode assembly 1 is reshaped in this embodiment. Since the first tab 112 is shaped, a fitting space is left in the center of the lead-out section 102, so that the current collector 2 can be fitted, and the first tab 112 can be connected to the circumferential surface of the current collector 2. When the current collecting piece 2 is connected with the first tab 112, the membrane is not easy to be damaged, the battery short circuit and self-discharge are not easy to be caused, and the use safety of the battery monomer 100 is improved.

Specifically, only one end of the wound electrode assembly 1 in the axial direction may be the shaped lead-out section 102, or both ends of the wound electrode assembly may be the shaped lead-out section 102. In the lead-out section 102 of the wound electrode assembly 1, the region surrounded by the second annular region Q2 is referred to as a central region, and the central region may be used for mounting parts or for gas-liquid flow.

In the present application, when the wound electrode assembly 1 includes at least two pole pieces 11, and one of the pole pieces 11 includes a main body portion 111 and a first tab 112, the other pole piece 11 may include the main body portion 111 and the first tab 112, and may also include the main body portion 111 and other types of tabs.

In some embodiments, as shown in fig. 1-3, the main portion 111 of the pole piece 11 includes a second pole tab 113 disposed along the second edge 11b, and the first pole tab 112 is attached to the second pole tab 113. That is, the pole piece 11 is not coated with active material in the edge region that is machined adjacent the second side 11b, such that the pole piece 11 forms a second pole ear 113 in the edge region along the second side 11b.

As shown in fig. 1 and 2, the second tab 113 is connected to the main body 111 and is disposed on the same side as the first tab 112, the second tab 113 is located in the central region, and the height of the second tab 113 in the axial direction of the wound electrode assembly 1 is smaller than the height of the first tab 112 in the axial direction of the wound electrode assembly 1. The height of the second tab 113 in the axial direction of the wound electrode assembly 1 is smaller than the height of the first tab 112 in the axial direction of the wound electrode assembly 1, and when the current collector 2 or other parts are located in the central region, as shown in fig. 8, the second tab 113 may support the current collector 2 or other parts located in the central region. After being unfolded, as shown in fig. 3, it can be understood that the height of the first tab 112 before being shaped is greater than that after being shaped.

In some embodiments, the height of the first tab 112 is H2, and the value of H2 may be adaptively designed according to the height of the current collector 2. The first tabs 112 have the same height after being shaped. The height of the second tab 113 is H1, and H1 is 0mm-5mm. As shown in fig. 3, the length of the second tab 113 along the length direction of the pole piece 11 is L0, and the second tab 113 is wound to form 5 to 30 layers.

In some embodiments of the present invention, as shown in fig. 1, the second tab 113 has a long bar shape extending along the length direction of the second side 11b. By forming the second tab 113 in a strip shape extending in the longitudinal direction of the second side 11b, the second tab 113 is wound to form a continuous multi-layer structure, which can improve the support stability of the current collector 2.

In some embodiments, the number of the second tabs 113 may also be multiple, the multiple second tabs 113 are arranged at intervals along the length direction of the tabs, when the pole piece 11 is wound into the wound electrode assembly 1, the multiple second tabs 113 form multiple sets of tab pairs in the circumferential direction of the wound electrode assembly 1, the multiple second tabs 113 on each tab pair are arranged in one-to-one correspondence in the radial direction of the wound electrode assembly 1, and the multiple sets of tab pairs are uniformly distributed along the circumferential direction of the wound electrode assembly 1.

In some embodiments of the present application, after the first tab 112 is shaped, as shown in fig. 8 and 7, an inner diameter d11 of the first circular ring area Q1 may be smaller than an inner diameter e21 of the second circular ring area Q2. Optionally, the outer diameter d12 of the first annular ring area Q1 is equal to the outer diameter e22 of the second annular ring area Q2.

In other embodiments of the present application, after the first tab 112 is shaped, as shown in fig. 11 and 12, an outer diameter d12 of the first circular ring area Q1 is greater than an outer diameter e22 of the second circular ring area Q2. Optionally, the inner diameter d11 of the first circular ring area Q1 is equal to the inner diameter e21 of the second circular ring area Q2.

In still other embodiments of the present application, after shaping the first tab 112, as shown in fig. 13 and 14, the inner diameter d11 of the first circular ring area Q1 is smaller than the inner diameter e21 of the second circular ring area Q2, and the outer diameter d12 of the first circular ring area Q1 is larger than the outer diameter e22 of the second circular ring area Q2.

Specifically, when the inner diameter of the second circular ring region Q2 is equal to the outer diameter of the central region, the first tab 112 is flattened from the outer side to the center along the radial direction of the wound electrode assembly 1 during shaping, and at this time, the current collector 2 may be located at the outer side or the central region of the second circular ring region Q2; when the inner diameter of the second circular ring area Q2 is larger than the outer diameter of the central area, at least a portion of the first tab 112 is flattened from the center to the outer side in the radial direction of the wound electrode assembly 1 during the shaping, for example, when the first tab 112 is flattened from the center to the outer side in the radial direction of the wound electrode assembly 1 during the shaping, the current collecting member 2 is located inside the second circular ring area Q2, or a portion of the first tab is flattened from the center to the outer side, and another portion of the first tab is flattened from the outer side to the center, and at this time, the current collecting member 2 may be located inside the second circular ring area Q2 or outside the second circular ring area Q2.

In some embodiments of the present invention, as shown in fig. 9, 10, 11 and 12, the wound electrode assembly 1 further includes an outer ring area at the lead-out section 102, the outer ring area surrounding the second circular ring area Q2 radially outward, the outer diameter of the outer ring area being equal to the diameter of the wound electrode assembly 1. By providing the outer ring region at the lead-out section 102 of the wound electrode assembly 1, the current collector 2 can be connected to the first tab 112 at the outer ring region, which facilitates the connection operation.

Specifically, when the wound electrode assembly 1 further includes an outer annular region at the lead-out section 102, at least a portion of the first tab 112 is flattened from the outer side to the center in the radial direction of the wound electrode assembly 1 during the reshaping, for example, the first tab 112 is flattened from the outer side to the center in the radial direction of the wound electrode assembly 1 during the reshaping, in which case the current collecting member 2 may be located in the central region or the outer annular region, or a portion of the first tab may be flattened from the center to the outer side and another portion may be flattened from the outer side to the center, in which case the current collecting member 2 may be located in the outer annular region or the inner side of the second annular region Q2.

In some embodiments, as shown in fig. 2 and 3, the two first sides 11a of the pole piece 11 are a first inner side 11a1 and a first outer side 11a2, respectively, the first inner side 11a1 is located at the innermost layer of the wound electrode assembly 1, and the first outer side 11a2 is located at the outermost layer of the wound electrode assembly 1. Each second side 11b further comprises a second sub-section 11b2, the second sub-section 11b2 being connected to the first inner side 11a1 and the first sub-section 11b1 being connected to the first outer side 11a2. Therefore, in the lead-out section 102 of the wound electrode assembly 1, the first tab 112 is not provided in the central region of the lead-out section 102, and a space is left in this position. This space is used either for accommodating other parts, such as the collector 2, the support 3, etc. And a space 114 is formed between the adjacent first tabs 112, and the space 114 can be communicated with the central area of the lead-out section 102 to form a circulation channel, which is beneficial to forming a circulation path of moisture and electrolyte.

In some embodiments, the size of the first tab 112 in a direction from the first inner edge 11a1 to the first outer edge 11a2 is a width L1 of the first tab 112, and the widths L1 of the plurality of first tabs 112 in the direction from the first inner edge 11a1 to the first outer edge 11a2 are gradually increased. Therefore, when the first tab 112 is shaped, the first tab 112 with a small curvature radius has a small width, and the first tab 112 with a large curvature radius has a large width, which is beneficial for keeping the loads of the first tab 112 at different positions consistent when the first tab is shaped. And the width of the first tab 112 is larger at the position where the diameter is larger, which is beneficial to improving the shaping efficiency.

In some embodiments, the width of the first tab 112 along the length of the pole piece 11 is L1, and the width of the gap 114 along the length of the pole piece 11 is L2. Alternatively, the widths L2 of the plurality of spaces 114 may be gradually increased in a direction from the first inner edge 11a1 to the first outer edge 11a2 to match the diameter variation of the jelly-roll type electrode assembly 1.

In some embodiments, the channels are scalloped, with a 5-30 ° scallop. Is convenient for processing and is beneficial to the circulation of electrolyte and water vapor. Optionally, the number of channels is 1-3.

In some embodiments, as shown in fig. 9 and 10, the current collector 2 includes a current collecting plate 21, and the first tab 112 is attached to an outer circumferential surface of the current collecting plate 21. The collector plate 21 is an electric conductor as a whole, and has high structural strength, strong deformation resistance and simple assembly.

In other embodiments, as shown in fig. 15 and 16, the current collector 2 includes a cylindrical slip ring 22, and the first tab 112 is attached to the outer or inner circumferential surface of the slip ring 22. By arranging the collector piece 2 as a collector ring 22, a central region of the collector piece 2 can be freed for the installation of further components or for flow through.

In still other embodiments, as shown in fig. 17 and 18, the manifold 2 includes a manifold cover 23, and the manifold cover 23 includes a cover plate 231 and a ring-shaped side plate 232, and the cover plate 231 is connected to one end of the side plate 232. The first tab 112 is attached to the outer or inner circumferential surface of the side plate 232 of the current collecting cap 23, and the cap plate 231 is located at one end of the side plate 232 remote from the jelly-roll type electrode assembly 1.

That is, the shape of collector cap 23 is the same as that of collector ring 22, except that cover plate 231 is added to the shape of collector ring 22, so that collector cap 23 and collector ring 22 can be assembled in the same manner. As shown in fig. 17, the header 23 may be located in the central region of the lead out section 102, i.e., surrounded by the second annular ring region Q2. As also shown in fig. 18, the manifold cap 23 may be located radially outward of the second annular ring Q2.

In some embodiments, as shown in fig. 19 and 20, a cover plate 231 may be provided on the manifold cap 23 to increase structural strength and torsion resistance, and another welding region 234 may be provided on the cover plate 231 on the manifold cap 23.

For example, in the embodiment shown in fig. 25 and 26, the battery cell 100 further includes: end cap 4, end cap 4 is located on the side of current collector 2 away from wound electrode assembly 1, and end cap 4 is connected to current collector 22. Alternatively, an insulating member 5 is provided between the end cap 4 and the current collector 22, and the terminal 41 on the end cap 4 is connected to the current collector 22 through the insulating member 5. Where current collector 2 is current collecting cap 23, it may be welded at weld area 234 to end cap 4 or terminal 41 on end cap 4. With collecting piece 2 so be connected with end cover 4, the integrated level is high, has improved assembly efficiency.

Alternatively, as shown in fig. 21 to 24, at least one of the cover plate 231 and the side plate 232 is provided with a lightening hole 233. Therefore, the weight of the current collecting piece 2 can be reduced, and the overall rigidity of the current collecting piece 2 is reduced after the hole is formed, thereby being beneficial to assembly.

Here, the lightening holes 233 may be through holes or blind holes. When the lightening holes 233 are through holes, a flow passage may be formed, which is advantageous to form a flow path of moisture and electrolyte.

In some embodiments, as shown in fig. 15-18, the battery cell 100 further includes: and an insulating support 3, wherein the support 3 is positioned at one axial end of the wound electrode assembly 1, the support 3 abuts against the second side 11b of the pole piece 11, and the first part 112a of the first tab 112 is positioned at the radial outer side of the support 3. At least part of the current collector member 22 is located between the support member 3 and the first portion 112a of the first tab 112 or at least part of the current collector member 22 is located radially outward of the first portion 112a of the first tab 112. The support member 3 is arranged without welding with the tab, and provides a support function for the first tab 112 and the current collecting member 2.

In the present embodiment, the battery cell 100 itself is an energy storage device 1000, and the battery cell 100 may also form other structural forms of the energy storage device 1000. As shown in fig. 28, a plurality of battery cells 100 may be assembled into another energy storage device 1000, such as a battery pack, a charging box, or the like.

The electric device 2000 according to the second embodiment of the present invention includes the battery cell 100 in the above embodiments, and the battery cell 100 supplies power to the electric device 2000. According to the electric equipment 2000 of the embodiment of the invention, the use safety of the electric equipment 2000 is improved by adopting the battery cell 100.

In the present embodiment, the structure of the electric device 2000 is not limited. For example, the electric device 2000 may be a mobile device such as a vehicle, a ship, a small airplane, etc., and includes a power source including the above battery cell 100. The electric energy provided by the battery cell 100 provides driving force for the electric device 2000. The mobile device may be a pure electric device, that is, the driving force of the electric device 2000 is all electric energy, and the power source only includes the battery cell 100. The mobile device may also be a hybrid device, and the power source includes the battery cell 100 and other power devices such as an engine. Taking the vehicle shown in fig. 29 as an example, in some embodiments, the electric device 2000 is a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid electric vehicle, an extended range vehicle, an electric tricycle, or a two-wheeled electric vehicle.

According to the electric equipment 2000 of the embodiment of the invention, the use safety of the electric equipment 2000 is improved by adopting the battery cell 100.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", and the like, indicate orientations and positional relationships based on the orientations and positional relationships shown in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; the connection can be mechanical connection, electrical connection or communication; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature "under," "beneath," and "under" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Moreover, various embodiments or examples and features of various embodiments or examples described in this specification can be combined and combined by one skilled in the art without being mutually inconsistent.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery cell, comprising:

the winding type electrode assembly (1) is formed by winding a pole piece (11) and a diaphragm (15) which are arranged in a laminated mode, the pole piece (11) comprises a main body part (111), the main body part (111) comprises two opposite first sides (11 a) and a second side (11 b) connected between the two first sides (11 a), each second side (11 b) comprises a first subsection (11 b 1), the pole piece (11) further comprises a plurality of first tabs (112) arranged on the first subsections (11 b 1), and the first tabs (112) comprise first portions (112 a) arranged along the axial direction of the winding type electrode assembly (1);

a current collecting member (2), the current collecting member (2) being located at one axial end of the wound electrode assembly (1), the current collecting member (2) having an outer circumferential surface and being attached to the first portion (112 a) of the first tab (112), or the current collecting member (2) having an inner circumferential surface and being attached to the first portion (112 a) of the first tab (112).

2. The battery cell according to claim 1, wherein the first sub-segment (11 b 1) is located in a first circular ring area (Q1), the first portion (112 a) of the first tab (112) is located in a second circular ring area (Q2), the radial width (w 1) of the first circular ring area (Q1) is greater than the radial width (w 2) of the second circular ring area (Q2), and the radial width of the circular ring area is half of the difference between the outer diameter and the inner diameter of the circular ring area.

3. The battery cell according to claim 1, wherein the two first sides (11 a) of the pole piece (11) are a first inner side (11 a 1) and a first outer side (11 a 2), respectively, the first inner side (11 a 1) being located at the innermost layer of the wound electrode assembly (1), and the first outer side (11 a 2) being located at the outermost layer of the wound electrode assembly (1);

each of said second edges (11 b) further comprises a second sub-section (11 b 2) connected to said first sub-section (11 b 1), said second sub-section (11 b 2) being connected to said first inner edge (11 a 1), said first sub-section (11 b 1) being connected to said first outer edge (11 a 2).

4. The battery cell according to claim 3, wherein the size of the first tab (112) in the direction from the first inner edge (11 a 1) to the first outer edge (11 a 2) is a width (L1) of the first tab (112), and the widths (L1) of the plurality of first tabs (112) gradually increase in the direction from the first inner edge (11 a 1) to the first outer edge (11 a 2).

5. The battery cell according to claim 1, characterized in that the main body (111) of the pole piece (11) comprises a second tab (113) arranged along the second edge (11 b), the first tab (112) being connected to the second tab (113).

6. The battery cell according to any of claims 1 to 5, characterised in that the current collector (2) comprises a current collector plate (21), the first tab (112) being attached to the outer circumferential surface of the current collector plate (21).

7. The battery cell according to any of claims 1-5, characterized in that the current collector (2) comprises a cylindrical current collector ring (22), and the first tab (112) is attached to the outer or inner circumferential surface of the current collector ring (22).

8. The battery cell according to any one of claims 1-5, wherein the current collecting member (2) comprises a current collecting cover (23), the current collecting cover (23) comprises a cover plate (231) and a ring-shaped side plate (232), and the cover plate (231) is connected to one end of the side plate (232);

the first tab (112) is connected to the outer or inner peripheral surface of the side plate (232) of the current collecting cover (23), and the cover plate (231) is located at one end of the side plate (232) far away from the coiled electrode assembly (1).

9. The battery cell according to claim 8, wherein at least one of the cover plate (231) and the side plate (232) is provided with a lightening hole (233).

10. The battery cell of any of claims 1-5, further comprising: an insulating support (3), the support (3) being located at one axial end of the wound electrode assembly (1), the support (3) abutting on the second side (11 b) of the pole piece (11), the first portion (112 a) of the first tab (112) being located radially outside the support (3);

at least part of the collector (2) is located between the support (3) and the first portion (112 a), or at least part of the collector (2) is located radially outside the first portion (112 a).

11. The battery cell of any of claims 1-5, further comprising: an end cap (4), wherein the end cap (4) is positioned on one side of the current collector (2) far away from the wound electrode assembly (1), and the end cap (4) is connected with the current collector (2);

or an insulating part (5) is arranged between the end cover (4) and the current collecting piece (2), and a terminal (41) arranged on the end cover (4) penetrates through the insulating part (5) and is connected with the current collecting piece (2).

12. A battery cell according to any of claims 1-5, characterized in that the first tab (112) further comprises a second portion (11 b 2) connected between the first portion (11 b 1) and the main body portion (111), the second portion (11 b 2) being arranged to extend in a radial direction of the wound electrode assembly (1).

13. An electric consumer, characterized in that it comprises a battery cell (100) according to any of claims 1-12, said battery cell (100) supplying power to said electric consumer (2000).