CN207781748U

CN207781748U - Wind battery core

Info

Publication number: CN207781748U
Application number: CN201721469582.3U
Authority: CN
Inventors: 江静; 肖良针
Original assignee: Ningde Amperex Technology Ltd
Current assignee: Ningde Amperex Technology Ltd
Priority date: 2017-11-07
Filing date: 2017-11-07
Publication date: 2018-08-28
Anticipated expiration: 2027-11-07

Abstract

The application provides a kind of winding battery core, it includes the first pole piece with the first collector and the second pole piece with the second collector, first pole piece has empty foil section, empty foil section includes the region that the first pole piece is bent for the first time, second pole piece has the second pole piece head sections, the both sides of the second collector in second pole piece head sections are coated with active material, and initiating terminal and the end of empty foil section are fallen in the projection in the directions T on the second pole piece head sections.The application's is designed to provide a kind of winding battery core, while improving the utilization rate and battery energy density of battery material, Li dendrite is effectively prevented from, to improve the security performance of battery.

Description

Wind battery core

Technical field

This application involves field of batteries, and more particularly, to a kind of winding battery core.

Background technology

With the development of science and technology, each electronic product emerges one after another, in recent years, to battery energy density and safety Requirement it is also higher and higher.

The prior art is in order to improve efficiency, and the pole piece in roll core structure of battery is passed through frequently with continuous coating process, this is caused The waste of core inner pole piece surface reactive material, and there is the risk of analysis lithium short circuit in the first corner of core inner pole piece, Battery energy density and safety are seriously affected.

Utility model content

For problems of the prior art, the application's is designed to provide a kind of winding battery core, to improve electricity While the utilization rate and battery energy density of pond material, it is effectively prevented from Li dendrite, to improve the security performance of battery.

According to the one side of the application, a kind of winding battery core is provided comprising the first pole piece with the first collector With the second pole piece with the second collector, there is the first pole piece empty foil section, empty foil section to occur for the first time including the first pole piece curved There are the second pole piece head sections, the both sides of the second collector in the second pole piece head sections to be coated with for the region of folding, the second pole piece Active substance, initiating terminal and the end of empty foil section are fallen in the projection in the directions T on the second pole piece head sections.

According to one embodiment of the application, in the directions T, the both sides of the second pole piece head sections are the first pole piece.

According to one embodiment of the application, in empty foil section, the first collector back on the second pole piece head sections Side is coated with active material, and the side for being intended for the second pole piece head sections is not coated with active material.

According to one embodiment of the application, the first pole piece includes setting parallel with the second pole piece head sections and spaced apart First pole piece head sections, empty foil section are connect with the first pole piece head sections.

According to one embodiment of the application, empty foil section includes the first extension of bending segment and the both ends extension by bending segment Section and the second extended segment, wherein throwing of the end of the end of the first extended segment and the second extended segment on the second pole piece head sections Shadow is spaced apart with the initiating terminal of the second pole piece head sections.

According to one embodiment of the application, the end of the end of the first extended segment and the second extended segment is in the second pole piece head Projection in section is spaced apart the first distance with the initiating terminal of the second pole piece head sections, and the first distance is not less than 4mm.

According to one embodiment of the application, the first pole piece is cathode sheets, and the second pole piece is anode strip.

According to one embodiment of the application, winding battery core further includes：Multiple first poles being electrically connected with the first collector Ear；And multiple second lugs being electrically connected with the second collector.

According to one embodiment of the application, one the first lug is set in each circle of the first collector, and the Second lug is arranged in each circle of two collectors；Or one the first lug is set in every half-turn of the first collector, and And one the second lug is set in every half-turn of the second collector.

According to one embodiment of the application, the first lug and the second lug respectively with the first collector and the second collector It is integrally formed；Or first lug and the second lug be respectively welded to the first collector and the second collector.

According to one embodiment of the application, the first lug and the second lug are connect by switching piece with external equipment.

According to one embodiment of the application, in the first pole piece, in addition to empty foil section, the both sides of the first collector apply It is covered with active material.

According to one embodiment of the application, the both sides of entire second collector of the second pole piece are coated with active matter Matter, wherein the endpiece for the diaphragm being arranged between the first pole piece and the second pole piece is enclosed in the outside of winding battery core.

According to one embodiment of the application, the second pole piece includes the second empty foil section, wherein the second empty foil section is centered around the The outside of one pole piece, and in the second empty foil section, the side of the first pole piece of direction of the second collector is coated with active material, First collector further includes the extension collector section extended by the end of the first pole piece, wherein extends the both sides of collector section Uncoated active material and the outside for being centered around the second empty foil section.

The advantageous effect of the application is：

In the winding battery core of the application, the first pole piece and the second pole piece form a kind of mutual-inserting type structure in winding center, Therefore the active material on the first pole piece head sections and the second pole piece head sections is relative to each other, not extra active material wave Take, this winding method of the first pole piece and the second pole piece improves the utilization rate and battery energy density of battery material；And

Due to facing the second pole piece in the empty foil section and empty foil section of the second pole piece head sections of setting encirclement on the first pole piece The uncoated active material in side, therefore will not cause the first pole piece initiating terminal analyse lithium, be effectively prevented from Li dendrite, significantly Ground improves the security performance of battery.

Description of the drawings

In order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, below will be to institute in embodiment Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the application Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings Obtain other attached drawings.

Fig. 1 instantiates the schematic diagram of the winding battery core of the prior art；

Fig. 2 is the schematic diagram according to the winding battery core of one embodiment of the application；

Fig. 3 is the schematic diagram according to the winding battery core of another embodiment of the application；

Fig. 4 is the schematic diagram according to the winding battery core of another embodiment of the application；

Fig. 5 is the schematic diagram according to the winding battery core of another embodiment of the application；

Fig. 6 is the schematic diagram according to the winding battery core of another embodiment of the application；

Fig. 7 is the stereogram according to the winding battery core of one embodiment of the application；

Fig. 8 instantiates the connection type of the first lug and switching piece；And

Fig. 9 instantiates another connection type of the first lug and switching piece.

Specific implementation mode

Below with reference to attached drawing, embodiments herein is specifically described.It should be noted that following each implementation Example can be combined with each other in any possible manner or partial replacement.

With reference first to Fig. 2 to Fig. 6, this application provides a kind of winding battery cores 10.Specifically, winding battery core 10 includes the Winding forms winding battery core 10 shown in Fig. 7 mutually for one pole piece 14 and the second pole piece 18, the first pole piece 14 and the second pole piece 18.Its In, the first pole piece 14 is including the first collector 12 and coated in the active material 24 on the first collector 12；Similarly, the second pole Piece 18 is including the second collector 16 and coated in the active material 24 on the second collector 16.First pole piece 14 has empty foil section 22, as shown in figure 3, empty foil section 22 has initiating terminal 220 and end 222 comprising the first time of the first pole piece 14 occurs curved The region of folding, that is to say, that first bent area of the first pole piece 14 is a part for empty foil section 22.Second pole piece 18 has the Two pole piece head sections 20, the second pole piece head sections 20 refer to the initiating terminal by the second pole piece 18 to first of the second pole piece 18 Section between bending segment, wherein the both sides of the second collector 16 in the second pole piece head sections 20 are coated with active material 24, and the initiating terminal 220 of empty foil section 22 is fallen with projection of the end 222 on the thickness direction T of winding battery core 10 second On pole piece head sections 20；In other words, there is empty foil section 22 opening, the second pole piece head sections 20 to be extended to by empty foil section by opening In 22 regions surrounded.

In the above-described embodiments, due to the second pole piece head sections 20 of the second pole piece 18 of setting encirclement on the first pole piece 14 Empty foil section 22 and empty foil section 22 in face the uncoated active material 24 in side of the second pole piece 18, therefore will not cause first The initiating terminal of pole piece 14 analyses lithium, is effectively prevented from Li dendrite, considerably improves the security performance of battery.

In one embodiment of the application, as shown in figure 3, the winding center of winding battery core 10 forms a kind of mutual-inserting type knot Structure, in this configuration, the both sides of the second pole piece head sections 20 are the first pole piece 14 so that the both sides of the second pole piece head sections 20 It is directly opposite with the empty foil section 20 of the first pole piece 14, with the prior art shown in FIG. 1 and the embodiment of the present application shown in Fig. 2 In the second pole piece head have more the first pole piece head one circle winding method compare, winding battery core 10 this mutual-inserting type winding in The heart can save significantly on material lift battery core energy density and improve space availability ratio.

According to one embodiment of the application, as shown in Figures 2 to 6, in empty foil section 22, the first collector 12 is backwards It is coated with active material 24, and court in the side (that is, towards surface of the outside of winding battery core 10) of the second pole piece head sections 20 To side (that is, towards the surface at the center of winding battery core 10) uncoated active material 24 of the second pole piece head sections 20.

In addition, in one embodiment of the application, as shown in Figures 3 to 6, the first pole piece 14 includes connecting with empty foil section 22 The the first pole piece head sections 26 connect, wherein the first pole piece head sections 26 refer to the initiating terminal by the first pole piece 14 to empty foil section Section between 22 initiating terminal, and the first pole piece head sections 26 and the second pole piece head sections 20 are parallel and spaced apart.

Further, according to one embodiment of the application, as shown in Figures 3 to 6, empty foil section 22 include bending segment 28, The first extended segment 30 extended by the initiating terminal of bending segment 28 and the second extended segment 32 extended by the end of bending segment 28, Wherein, the first extended segment 30 and the first pole piece head sections 26 of the first pole piece 14 are continuously joined one to the other, that is to say, that empty foil section 22 bending segment 28 be the first pole piece 14 first bending segment, 22 and first pole piece head sections 26 of empty foil section be directly connected to without It is connect with the first pole piece head sections 26 via any additional winding section of the first pole piece 14.In addition, the first extended segment 30 (end 50 herein is equivalent to for the end 50 of end 48 (end 48 herein is equivalent to initiating terminal 220) and the second extended segment 32 End 222) projection on the second pole piece head sections 20 is spaced apart with the initiating terminal 52 of the second pole piece head sections 20, that is, edge Wind the thickness direction T of battery core 10, the end 50 of the end 48 of the first extended segment 30 and the second extended segment 32 not with the second pole The initiating terminal 52 of head section 20 is aligned, and in order to realize that empty foil section 22 surrounds the second pole piece head sections 20, the second pole piece head The initiating terminal 52 of section 20 is relative to the end 48 of the first extended segment 30 and the end 50 of the second extended segment 32 closer to bending segment 28, so that the second pole piece head sections 20 extend in sky foil section 22.Illustratively, in one embodiment of the application, first The end 50 of the end 48 of extended segment 30 and the second extended segment 32 along winding battery core 10 thickness direction T alignment and with the second pole piece W is spaced apart the first distance D to the initiating terminal 52 of head sections 20 in the width direction, for example, the first distance D is 4mm, in such case Under, the initiating terminal 52 of the second pole piece head sections 20 extends to the distance of 4mm in the areas Kong Bo 22.

In the various embodiments described above of the application and other possible embodiments, the first pole piece 14 is cathode sheets, and Second pole piece 18 is anode strip.

In addition, as shown in Fig. 4 to Fig. 9, the winding battery core 10 of the application may also include to be electrically connected with the first collector 12 Multiple first lugs 34 and multiple second lugs 36 being electrically connected with the second collector 16.Wherein, in embodiments herein, As shown in figure 4, first lug 34 is arranged in each circle in the first collector 12, and in each circle of the second collector 16 One the second lug 36 can be set；Alternatively, as shown in figure 5, first lug can be arranged in every half-turn in the first collector 12 34, and one the second lug 36 is set in every half-turn of the second collector 16.It should be noted herein that in the winding electricity of the application In core 10, the setting frequency of the first lug 34 and the second lug 36 can change according to practical application, and the application is not limited thereto. In addition, in this application, the first lug 34 and the second lug 36 respectively with the first collector 12 and 16 one of the second collector at Type, that is, the first lug 34 and the first collector 12 belong to same foil, for example, can be by by the first of uncoated active material Collector 12 cuts and forms the first lug 34, and the second lug 36 can also be made with the second collector 16 of identical method；Or Person, in other embodiments, the first lug 34 and the second lug 36 can be respectively welded to the first collector 12 and the second collector 16。

In one embodiment of application, the first lug 34 and the second lug 36 can be set by switching piece 38 and external electricity consumption Standby connection.Specifically, as shown in figure 8, multiple first pole pieces 34 of the first pole piece 14 towards winding battery core 10 thickness direction T mono- Side is stacked together and extends one section of jointing 46 with flushing, wherein switching piece 38 welds in the same direction with jointing 46, institute Meaning welding in the same direction, i.e., the extending direction of the welding ends of jointing 46 is identical as the extending direction of the welding ends of switching piece 38, example Such as, in the embodiment shown in fig. 8, the extending direction of the two is straight down.It is different from welding manner shown in Fig. 8, In embodiment shown in Fig. 9, jointing 46 and 38 incorgruous welding of switching piece, so-called incorgruous welding, the i.e. weldering of jointing 46 The extending direction for connecing end is different from the extending direction of the welding ends of switching piece 38, for example, in the embodiment shown in fig. 9, connection The extending direction of the welding ends of section 46 is straight down that and the extending direction of the welding ends of switching piece 38 is straight up.Due to Second lug 36 is identical as the first lug 34 as the connection type of switching piece 38, is not described in detail herein.

As shown in Figures 3 to 6, in one embodiment of the application, in the first pole piece 14, in addition to empty foil section 22, The both sides of first collector 12 are coated with active material 24, and the first pole piece 14 extends not more than the second pole piece 18, i.e., and One pole piece 14 is surrounded by the second pole piece 18 always.

As shown in figure 5, in one embodiment of the application, the both sides of entire second collector 16 of the second pole piece 18 are equal Coated with active material 24, and the endpiece for the diaphragm 40 being arranged between the first pole piece 14 and the second pole piece 18 is enclosed in winding The mode of continuous coating active material 24 can be used in the outside of battery core 10, in this embodiment, the second pole piece 18, and technique is relatively simple It is single.

In addition, as shown in fig. 6, in one embodiment of the application, the second pole piece 18 includes the second empty foil section 42, In, the second empty foil section 42 is centered around the outside of the first pole piece 14, and in the second empty foil section 42, the direction of the second collector 16 The side of first pole piece 14 is coated with active material 24, and back on the uncoated active material 24 in the side of the first pole piece 14, In the embodiment, by the empty foil section 42 of setting second, the active material of the outer diaphragm number of plies and invalid first pole piece can be saved, The energy density of battery is improved while cost-effective.

With further reference to Fig. 6, in one embodiment of the application, the first collector 12 further includes by the first pole piece 14 The extension collector section 44 that end is extended, wherein extend the uncoated active material 24 in both sides of collector section 44 and enclose It is wound on the outside of the second empty foil section 42.

In the above-described embodiments, when the second pole piece 18 is there are when the second empty foil section 42, empty foil section 42 can be at least one circle, empty Foil section 42, which wraps up the first pole piece 14, prevents sky copper foil from directly contacting to form galvano-cautery initiation safety problem with aluminum plastic film, is formed simultaneously Radiating rate can be improved in vest area, the problem of effectivelying prevent abusing explosion as on fire such as drift bolt process initiation battery core.

The foregoing is merely the preferred embodiments of the application, are not intended to limit this application, for the skill of this field For art personnel, the application can have various modifications and variations.Within the spirit and principles of this application, any made by repair Change, equivalent replacement, improvement etc., should be included within the protection domain of the application.

Claims

Include the first pole piece with the first collector and the second pole piece with the second collector 1. a kind of winding battery core, It is characterized in that,

It includes the region that first pole piece is bent for the first time, institute that first pole piece, which has empty foil section, the sky foil section, Stating the second pole piece, there are the second pole piece head sections, the both sides of second collector in the second pole piece head sections to be coated with Active substance, the side that the sky foil section is intended for the second pole piece head sections are not coated with active material, the sky foil The initiating terminal of section is fallen in the projection in the directions T on the second pole piece head sections with end.
2. winding battery core according to claim 1, which is characterized in that in the directions T, the second pole piece head sections Both sides are first pole piece.
3. winding battery core according to claim 1, which is characterized in that in the empty foil section, first collector It is coated with active material back on the side of the second pole piece head sections.
4. winding battery core according to claim 1, which is characterized in that first pole piece includes and the second pole piece head Section is parallel and the first pole piece head sections of setting spaced apart, the sky foil section are connect with the first pole piece head sections.
5. winding battery core according to claim 1, which is characterized in that the sky foil section includes bending segment and by the bending The first extended segment and the second extended segment that the both ends of section extend, wherein the end of first extended segment and described second extends Projection of the end of section on the second pole piece head sections is spaced apart with the initiating terminal of the second pole piece head sections.
6. winding battery core according to claim 5, which is characterized in that prolong the end of first extended segment and described second It stretches projection of the end of section on the second pole piece head sections and is spaced apart the with the initiating terminal of the second pole piece head sections One distance, first distance are not less than 4mm.
7. winding battery core according to claim 1, which is characterized in that first pole piece is cathode sheets, and described the Two pole pieces are anode strip.
8. winding battery core according to claim 1, which is characterized in that further include：

Multiple first lugs being electrically connected with first collector；And

Multiple second lugs being electrically connected with second collector.
9. winding battery core according to claim 8, which is characterized in that

One first lug is set in each circle of first collector, and in each circle of second collector One second lug is set；Or

One first lug is set in every half-turn of first collector, and in every half-turn of second collector One second lug is set.
10. winding battery core according to claim 8, which is characterized in that first lug and second lug difference With first collector and the second afflux body by integral forming；Or

First lug and second lug are respectively welded to first collector and second collector.
11. winding battery core according to claim 8, which is characterized in that first lug and second lug pass through Switching piece is connect with external equipment.
12. winding battery core according to claim 1, which is characterized in that in first pole piece, except the empty foil section it Outside, the both sides of first collector are coated with active material.
13. winding battery core according to claim 12, which is characterized in that entire second afflux of second pole piece The both sides of body are coated with active material, wherein the tail for the diaphragm being arranged between first pole piece and second pole piece Section is enclosed in the outside of the winding battery core.
14. winding battery core according to claim 12, which is characterized in that second pole piece includes the second empty foil section, In, the described second empty foil section is centered around the outside of first pole piece, and in the described second empty foil section, second afflux The side of direction first pole piece of body is coated with active material, and first collector further includes by first pole piece The extension collector section that end is extended, wherein it is described extend collector section the uncoated active material in both sides and surround In the outside of the described second empty foil section.