CN221009184U - Pole piece and battery - Google Patents

Abstract

The application discloses a pole piece and a battery. The current collector comprises a first side edge and a second side edge which are oppositely arranged along the direction perpendicular to the length direction of the current collector; the tab is connected to the first side edge; the conductive sheet is connected to the second side edge; the second side edge is configured to be spiral when the current collector is in a winding state and forms a plurality of spiral coils distributed from inside to outside, and the conductive sheet is configured to be capable of being bent to be electrically connected with at least two spiral coils when the current collector is in the winding state. The conductive sheet disclosed by the application is configured to be capable of being bent to be electrically connected with at least two spiral coils when the current collector is in a winding state, so that the electrode lugs and the current collector can be discharged through the conductive sheet, thereby reducing the transmission distance of ions on the electrode sheet, reducing the internal resistance of the electrode sheet and improving the conductivity of the electrode sheet.

Description

Pole piece and battery

Technical Field

The application relates to the field of electrochemical energy storage, in particular to a pole piece and a battery.

Background

In modern society, the use of energy and the development of storage field are rapid, especially including electrochemical energy storage, and lithium ion battery is as a novel secondary battery, has energy density and power density big, work voltage is high, light in weight, small, cycle life is long, the security is good, green, and the like advantage, has wide application prospect in portable electrical apparatus, electric tool, large-scale energy storage, electric traffic power supply etc.. The internal resistance of a lithium battery refers to the resistance inside the battery. The excessive internal resistance of the lithium battery may cause a decrease in charge and discharge efficiency of the battery. Since electrons cannot flow rapidly when the internal resistance of the battery is excessively large, the charge and discharge efficiency of the battery may be lowered.

Disclosure of utility model

The application mainly aims to provide a pole piece and a battery, so as to reduce the transmission distance of ions on the pole piece, reduce the internal resistance of the pole piece and improve the conductivity of the pole piece.

In order to solve the technical problems, the application provides a pole piece, which comprises:

the current collector comprises a first side edge and a second side edge which are oppositely arranged along the direction perpendicular to the length direction of the current collector;

The electrode lug is connected to the first side edge;

the conducting plate is connected to the second side edge;

The second side edge is configured to be spiral when the current collector is in a winding state and forms a plurality of spiral coils distributed from inside to outside, and the conductive sheet is configured to be capable of being bent to be electrically connected with at least two spiral coils when the current collector is in the winding state.

In some embodiments, the tab is located at a first end of the first side, and a length a of the first end and a length B of the current collector satisfy: A/B is more than or equal to 0 and less than or equal to 0.3.

In some embodiments, the conductive sheet is configured to be bendable to be electrically connected to each of the spiral turns when the current collector is in a wound state.

In some embodiments, the current collector includes an outer wall and an inner wall that are oppositely disposed perpendicular to a thickness direction thereof, the outer wall being configured to be positioned outside the current collector when the current collector is in a wound state, the inner wall being configured to be positioned inside the current collector, and the conductive sheet being configured to be bendable to be connected to the outer wall when the current collector is in a wound state.

In some embodiments, the conductive sheet is connected to the inner wall, the conductive sheet is located at a second end of the second side, and a length C of the second end and a length B of the current collector satisfy: C/B is more than or equal to 0 and less than or equal to 0.3.

In some embodiments, the conductive sheet is integrally formed with the current collector.

In some embodiments, the pole piece includes two conductive pieces, and each conductive piece is bent outward to opposite sides when the current collector is in a winding state.

In some embodiments, the pole piece is an anode pole piece.

The second aspect of the present application also provides a pole piece comprising:

the current collector comprises a first side edge and a second side edge which are oppositely arranged along the direction perpendicular to the length direction of the current collector;

The electrode lug is connected to the first side edge;

the conducting strip is connected to the first side edge;

The second side edge is configured to be spiral when the current collector is in a winding state and forms a plurality of spiral coils distributed from inside to outside, and the conductive sheet is configured to be capable of being bent to be electrically connected with at least two spiral coils when the current collector is in the winding state.

The third aspect of the present application also provides a battery comprising:

The pole piece of any of the embodiments above;

a housing defining an interior cavity to house the pole piece.

Compared with the prior art, the application has the beneficial effects that:

In the technical scheme of the application, the conductive sheet is configured to be capable of being bent to be electrically connected with at least two spiral rings when the current collector is in a winding state, so that discharge can be carried out between the tab and the current collector through the conductive sheet. In the prior art, discharge can be carried out only through the current collector between each spiral ring and the tab, and the transmission distance of ions on the current collector is the distance from the discharge position to the tab along the current collector. Compared with the prior art, in the embodiment of the application, the transmission distance of ions on the current collector can be the distance from the discharge position to the tab along the current collector, or the distance from the discharge position to the conductive sheet along the current collector plus the distance from the conductive sheet to the tab and the distance from the conductive sheet to the tab, and the ions can be transmitted through a path with lower resistance. In the application, the transmission distance of ions on the pole piece is reduced, so that a path with lower resistance is selected, the resistance of the ion in discharge is changed, the effect of reducing the internal resistance of the pole piece is achieved, and the conductivity of the pole piece is improved.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a side view of a pole piece according to a first embodiment of the present application; the pole piece is positioned on the second side edge, and the length A of the first end part, the length B of the current collector and the length C of the second end part are marked;

FIG. 2 is a side view of a pole piece according to a first embodiment of the present application; wherein, the pole piece is in a winding state;

FIG. 3 is a side view of a second side of a pole piece according to a first embodiment of the present application; wherein, the pole piece is in a winding state, and the broken line divides the current collector into a plurality of spiral rings;

FIG. 4 is a side view of a second side edge of a pole piece according to a second embodiment of the present application; the pole piece is in a winding state, the current collector is divided into a plurality of spiral rings by a dotted line, and the spiral rings are polygonal with a plurality of fillets;

FIG. 5 is a side view of a third embodiment of the present application providing a second side of a pole piece; wherein, the pole piece is in a winding state, and the conductive sheet is bent to be electrically connected with each spiral ring;

FIG. 6 is a side view of a fourth embodiment of the present application providing a second side of a pole piece; wherein, the pole piece is in a winding state, and the conductive sheet is bent to be electrically connected with each spiral ring;

FIG. 7 is a side view of a pole piece according to a fifth embodiment of the present application; the distance F from the conductive sheet to the inner end of the second side edge and the width G of the conductive sheet are marked;

FIG. 8 is a side view of a pole piece according to a fifth embodiment of the present application; wherein, the pole piece is in a winding state, and the conductive sheet is bent to be connected with the outer wall;

FIG. 9 is a side view of a pole piece according to a sixth embodiment of the present application; wherein the pole piece comprises two conductive pieces;

FIG. 10 is a side view of a pole piece according to a sixth embodiment of the present application; the pole piece is in a winding state and comprises two conductive sheets, and the conductive sheets are spaced;

FIG. 11 is a side view of a seventh embodiment of the present application providing pole pieces; the pole piece is in a winding state and comprises two conductive sheets which are connected with each other;

FIG. 12 is a side view of a seventh embodiment of the present application providing a second side of a pole piece; the pole piece is in a winding state and comprises two conductive sheets which are connected with each other;

FIG. 13 is a side view of a zebra coating of a plurality of pole pieces provided in accordance with an eighth embodiment of the present application; wherein there are uncoated areas between the current collectors;

FIG. 14 is a side view of a pole piece according to a ninth embodiment of the present application; wherein the conductive sheet is positioned at the first side edge;

FIG. 15 is a side view of a pole piece according to a ninth embodiment of the present application; the pole piece is in a winding state, and the conducting strip is positioned on the first side edge.

Reference numerals illustrate:

a pole piece 10;

Current collector 100;

a first side 110;

a first end 111;

A second side 120;

a spiral turn 121;

a second end 122;

An inner wall 130;

An outer wall 140;

A tab 200;

Conductive sheet 300.

The achievement of the objects, functional features and advantages of the present application will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

It should be noted that, if a directional indication (such as up, down, left, right, front, and rear … …) is included in the embodiment of the present application, the directional indication is merely used to explain a relative positional relationship, a movement condition, and the like between the components in a specific posture, and if the specific posture is changed, the directional indication is correspondingly changed.

In addition, when an element is referred to as being "fixed to" another element, it can be directly on the other element or one or more intervening elements may be present therebetween. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or one or more intervening elements may be present therebetween.

In addition, if there is a description of "first", "second", etc. in the embodiments of the present application, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, if "and/or", "and/or" and/or "are used throughout, the meaning includes three parallel schemes, for example," a and/or B ", including a scheme, or B scheme, or a scheme where a and B meet simultaneously. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present application.

In modern society, the use of energy and the development of storage field are rapid, especially including electrochemical energy storage, and lithium ion battery is as a novel secondary battery, has energy density and power density big, work voltage is high, light in weight, small, cycle life is long, the security is good, green, and the like advantage, has wide application prospect in portable electrical apparatus, electric tool, large-scale energy storage, electric traffic power supply etc.. The internal resistance of a lithium battery refers to the resistance inside the battery. The excessive internal resistance of the lithium battery may cause a decrease in charge and discharge efficiency of the battery. Since electrons cannot flow rapidly when the internal resistance of the battery is excessively large, the charge and discharge efficiency of the battery may be lowered.

In order to solve the above-mentioned problems, referring to fig. 1 to 12, the present application proposes a pole piece 10, wherein the pole piece 10 includes a current collector 100, a tab 200 and a conductive sheet 300. The pole piece 10 may be wound to form a battery core by winding the pole piece 10 with the other opposite polarity. In some embodiments, the wound profile of pole piece 10 may take on a variety of columnar configurations. In some embodiments, current collector 100 may be cylindrical. In other embodiments, current collector 100 may be a polygonal body including a plurality of rounded corners. The rectangular parallelepiped current collector 100 is taken as an example in the embodiment of the present application, depending on the actual situation. The current collector 100 includes a first side 110 and a second side 120 that are oppositely disposed in a direction perpendicular to a length direction thereof.

The profile of current collector 100 may take on a variety of configurations. In some embodiments, current collector 100 may be rectangular parallelepiped. In other embodiments, current collector 100 may be polygonal, etc. The rectangular parallelepiped current collector 100 is taken as an example in the embodiment of the present application, depending on the actual situation. The current collector 100 includes a first side 110 and a second side 120 that are oppositely disposed in a direction perpendicular to a length direction thereof.

The tab 200 is connected to the first side 110 and the current collector 100, and the tab 200 is used for outputting the current generated by the current collector 100. The specific number of the tabs 200 may depend on the actual situation, and the tabs 200 may be exemplarily set to one, two, three, four, etc., which is an example of the embodiment of the present application.

The conductive sheet 300 may have a variety of contours. In some embodiments, the conductive sheet 300 may have a rectangular parallelepiped shape. In other embodiments, the conductive sheet 300 may be polygonal, etc. In other embodiments, the conductive sheet 300 may be in the form of a cylinder or the like. In particular, the embodiment of the present application takes the rectangular conductive sheet 300 as an example, depending on the actual situation. One end of the conductive sheet 300 is connected to the second side 120 and to the current collector 100.

When the current collector 100 is in a wound state, referring to fig. 5 and 6, the second side 120 is configured to be spiral and form a plurality of spiral turns 121 distributed from inside to outside. The specific number of the spiral turns 121 may depend on the actual situation, and the spiral turns 121 may be exemplarily provided as two, three, four, etc. The outline of the spiral turn 121 may take on a variety of configurations. In some embodiments, the spiral turn 121 may be spiral in the width direction of the current collector 100. In other embodiments, the spiral turn 121 may be a polygonal body including a plurality of rounded corners, etc., along the width direction of the current collector 100, as the case may be. The conductive sheet 300 is configured to be capable of being bent to be electrically connected to at least two spiral turns 121 when the current collector 100 is in a wound state, so that discharge between the tab 200 and the current collector 100 can be performed through the conductive sheet 300. In the embodiment of the present application, the transmission distance of the ions on the current collector 100 may be the distance from the discharge position to the tab 200 along the current collector 100, or may be the distance from the discharge position to the conductive sheet 300 along the current collector 100 plus the distance moved on the conductive sheet 300 and the distance from the conductive sheet 300 to the tab 200, and the ions may be transmitted through a path with lower resistance. By reducing the transmission distance of ions on the pole piece 10, a path with lower resistance is selected to change the resistance of the ions during discharge, so as to achieve the effect of reducing the internal resistance of the pole piece 10 and improve the conductivity of the pole piece 10.

Referring to fig. 3 and 4, the second side 120 includes two ends, one of which is an inner end, the other is an outer end, and the other is an outer end of the current collector 100 when the current collector 100 is in a wound state. When the current collector 100 is in a wound state, the current collector 100 is wound 360 degrees around the current collector 100 with the outer end of the second side 120 as an end point to form one spiral turn 121. And the current collector 100 wound 360 degrees along the end of the previous spiral turn 121 forms the next spiral turn 121, thereby forming a plurality of spiral turns 121 by the current collector 100. When wound to the outer end, the current collector 100 from the end of the last spiral turn 121 to the outer end forms the next spiral turn 121, whether or not 360 degrees are wound.

Referring to fig. 1, tab 200 is located at the end of first side 110 to facilitate processing during the coating process of pole piece 10. In some embodiments, tab 200 is located at first end 111 of first side 110, and length a of first end 111 and length B of current collector 100 satisfy: A/B is more than or equal to 0 and less than or equal to 0.3. Illustratively, the ratio a/B of the length a of the first end 111 to the length B of the current collector 100 may be 0, 0.05, 0.1, 0.15, 0.2, 0.25, 0.3, and so forth. Further, the tab 200 is located at the first end 111 of the first side 110, and the length a of the first end 111 and the length B of the current collector 100 satisfy: A/B is more than or equal to 0 and less than or equal to 0.2. Illustratively, the ratio a/B of the length a of the first end 111 to the length B of the current collector 100 may be 0, 0.05, 0.1, 0.15, 0.2, and so forth. Through locating the tab 200 at the first end 111, the positioning of the placement position of the tab 200 is reduced, and the processing of the pole piece 10 is not required to reserve a groove for placing the tab 200, so that the processing cost is reduced, the production efficiency is improved, and the economic benefit of the tab 200 is improved. Due to the electrical connection of the conductive sheet 300, the tab 200 is disposed at the first end 111, which does not increase the internal resistance of the pole piece 10, further ensures the conductivity of the pole piece 10, and ensures the economic benefit of the pole piece 10.

In some embodiments, the conductive sheet 300 is configured to be capable of being bent to be electrically connected to each spiral coil 121 when the current collector 100 is in a wound state, so that the distance of the ions on each spiral coil on the current collector 100 may be the distance from the discharge position to the tab 200 along the current collector 100, or the distance from the discharge position to the conductive sheet 300 along the current collector 100 plus the distance of the conductive sheet 300 moving along the conductive sheet 300 and the distance of the conductive sheet 300 to the tab 200, and each winding part is connected with the conductive sheet 300, so that the distance from the discharge position to the conductive sheet 300 is less than or equal to 180 degrees of the wound current collector 100, and the ions may be transmitted through a path with lower resistance. By further reducing the transmission distance of ions on the pole piece 10, a path with lower resistance is selected to change the resistance of the ions during discharge, so as to achieve the effect of further reducing the internal resistance of the pole piece 10 and further improve the conductivity of the pole piece 10.

Referring to fig. 2, the current collector 100 includes an outer wall 140 and an inner wall 130 which are oppositely disposed perpendicular to a thickness direction thereof, the outer wall 140 is configured to be positioned at an outer side of the current collector 100 when the current collector 100 is in a wound state, the inner wall 130 is configured to be positioned at an inner side of the current collector 100, and the conductive sheet 300 is configured to be bendable to be connected to the outer wall 140 when the current collector 100 is in a wound state, so as to ensure that the conductive sheet 300 is connected to each winding, thereby improving stability of connection. In other embodiments, the conductive sheet 300 is configured to be capable of being bent to be connected to the inner wall 130 when the current collector 100 is in a wound state, so as to improve the connection stability of the conductive sheet 300.

In some embodiments, referring to fig. 1, the conductive sheet 300 is connected to the inner wall 130, the conductive sheet 300 is located at the second end 122 of the second side 120, and the length C of the second end 122 and the length B of the current collector 100 satisfy: C/B is more than or equal to 0 and less than or equal to 0.3. Illustratively, the ratio C/B of the length C of the second end 122 to the length B of the current collector 100 may be 0, 0.05, 0.1, 0.15, 0.2, 0.25, 0.3, and so forth. Further, the conductive sheet 300 is located at the second end 122 of the second side 120, and the length C of the second end 122 and the length B of the current collector 100 satisfy: C/B is more than or equal to 0 and less than or equal to 0.2. Illustratively, the ratio C/B of the length C of the second end 122 to the length B of the current collector 100 may be 0, 0.05, 0.1, 0.15, 0.2, and so forth. By arranging the conductive sheet 300 at the second end 122, positioning of the placement position of the conductive sheet 300 is reduced, and processing of the pole piece 10 is not needed to reserve a groove for placing the conductive sheet 300, so that processing cost is reduced, production efficiency is improved, and economic benefits of the tab 200 are improved. In some embodiments, the first end 111 is disposed below the second end 122 in the direction from the first side 110 to the second side 120. The distance between the conducting strips 300 and the tabs 200 along the current collector 100 is reduced, and the transmission distance of ions on the pole piece 10 is further reduced, so that a path with lower resistance is selected, the resistance of the ions during discharge is changed, the effect of further reducing the internal resistance of the pole piece 10 is achieved, and the conductivity of the pole piece 10 is further improved. Further, the conductive sheet 300 is disposed under the tab 200 along the direction from the first side 110 to the second side 120. The distance between the conductive sheet 300 and the tab 200 along the current collector 100 is further reduced, and the transmission distance of ions on the pole piece 10 is further reduced, so that a path with lower resistance is selected, and the resistance of the ions during discharge is changed, thereby achieving the effect of further reducing the internal resistance of the pole piece 10 and further improving the conductivity of the pole piece 10.

The conductive sheet 300 and the current collector 100 are integrally formed, and the conductive sheet 300 and the current collector 100 do not need to be connected, so that the resistance of the current collector 100 and the conductive sheet 300 piece is reduced, and the loss of communication between the current collector 100 and the conductive sheet 300 is reduced. In some embodiments, one end of the conductive sheet 300 is integrally formed with the current collector 100, and the other end of the conductive sheet 300 is connected to the current collector 100 after the current collector 100 is in a wound state. It should be noted that the specific connection manner between the conductive sheet 300 and the current collector 100 may be determined according to practical situations. In some embodiments, conductive sheet 300 is connected to current collector 100 by welding. In other embodiments, conductive sheet 300 is bonded to current collector 100 by adhesive bonding. The present embodiment takes welding as an example. In some embodiments, referring to fig. 13, the plurality of current collectors 100 are formed by zebra coating. During the coating process, a plurality of uncoated areas remain between each current collector 100. When the current collectors 100 are cut and separated, the first side 110 of each current collector 100 is cut from the uncoated areas, so that the separation is completed, and each uncoated area corresponds to each current collector 100 one by one and is integrally formed. Then, each of the coated areas is cut, and each of the uncoated areas is processed to form the conductive sheet 300, so as to ensure that the conductive sheet 300 and the current collector 100 are integrally formed. The current collectors 100 are tightly connected with the conductive sheets 300 by performing processing molding through zebra coating, and uncoated areas among the current collectors 100 in the zebra coating are utilized, so that the conductive sheets 300 are generated without processing redundant materials, the processing cost is reduced, and the processing economic benefit is improved.

The pole piece 10 comprises two conductive strips 300. In some embodiments, the specific number of conductive sheets 300 may depend on the actual situation. Illustratively, the conductive sheet 300 may be provided as two, three, four, etc. In some embodiments, referring to fig. 9, 10, 11, and 12, each conductive tab 300 is located at a third end and a fourth end of the second side 120, respectively. The third end length D satisfies the length B of the current collector 100: D/B is more than or equal to 0 and less than or equal to 0.3; and/or, the fourth end length E and the length B of the current collector 100 satisfy: E/B is more than or equal to 0 and less than or equal to 0.3. Illustratively, the ratio D/B of the length D of the third end to the length B of the current collector 100 may be 0, 0.05, 0.1, 0.15, 0.2, 0.25, 0.3, and so forth. Illustratively, the ratio E/B of the length E of the third end to the length B of the current collector 100 may be 0, 0.05, 0.1, 0.15, 0.2, 0.25, 0.3, and so forth. Further, the conductive sheet 300 is located at the second end 122 of the second side 120, and the third end length D and the length B of the current collector 100 satisfy: D/B is more than or equal to 0.1 and less than or equal to 0.2; and/or, the fourth end length E and the length B of the current collector 100 satisfy: E/B is more than or equal to 0.1 and less than or equal to 0.2. Illustratively, the ratio D/B of the third end length D to the length B of the current collector 100 may be 0.1, 0.15, 0.2, and so on. Illustratively, the ratio E/B of the fourth end length E to the length B of the current collector 100 may be 0.1, 0.15, 0.2, and so on. Further, each conductive sheet 300 is located on the inner wall 130; or each conductive tab 300 is located on the outer wall 140. In other embodiments, referring to fig. 7 and 8, each conductive sheet 300 is located on the outer wall 140 and the inner wall 130, and the distance F from each conductive sheet 300 to the inner end of the second side 120 and the length B of the current collector 100 are as follows: F/B is 0.3.ltoreq.F/B is 0.7-G/B, where G is the width of the conductive sheet 300. Illustratively, the ratio F/B of the distance F of each conductive sheet 300 to the inner end of the second side 120 to the length B of the current collector 100 may be 0.3, 0.4, 0.5, etc. In some embodiments, each conductive sheet 300 is bent outward to opposite sides when the current collector 100 is in a wound state, so that the current collectors 100 in opposite directions are connected by the conductive sheets 300.

In some embodiments, the electrode sheet 10 is a cathode electrode sheet, wherein the material of the current collector 100 may be aluminum foil. In some embodiments, pole piece 10 is an anode pole piece, wherein current collector 100 material may be copper foil. For processes such as pole lug placement and the like requiring cutting of cathode pole pieces for reducing resistance, as the aluminum foil is low in hardness and high in ductility, the coating coated on the surface of the aluminum foil is difficult to remove, so that the coating remains on the aluminum foil to interfere with ion discharge, the resistance reduction amplitude during ion discharge is low, and the improvement amplitude of the conductivity of the pole pieces is low. In this embodiment, the anode pole piece is directly processed, and the copper foil has higher hardness and lower ductility, so that the coated paint on the surface of the copper foil is easy to remove, and the residual paint on the surface of the copper foil is lower, so that the resistance reduction amplitude during ion discharge is higher, the conductivity of the pole piece 10 is higher, and the economic benefit of the pole piece 10 is improved.

The second aspect of the application also provides a pole piece 10, see fig. 14 and 15. The pole piece 10 includes a current collector 100, a tab 200, and a conductive sheet 300. The pole piece 10 may be wound to form a battery core by winding the pole piece 10 with the other opposite polarity. In some embodiments, the wound profile of pole piece 10 may take on a variety of columnar configurations. In some embodiments, current collector 100 may be cylindrical. In other embodiments, current collector 100 may be a polygonal body including a plurality of rounded corners. The rectangular parallelepiped current collector 100 is taken as an example in the embodiment of the present application, depending on the actual situation. The current collector 100 includes a first side 110 and a second side 120 that are oppositely disposed in a direction perpendicular to a length direction thereof.

The profile of current collector 100 may take on a variety of configurations. In some embodiments, current collector 100 may be rectangular parallelepiped. In other embodiments, current collector 100 may be polygonal, etc. The rectangular parallelepiped current collector 100 is taken as an example in the embodiment of the present application, depending on the actual situation. The current collector 100 includes a first side 110 and a second side 120 that are oppositely disposed in a direction perpendicular to a length direction thereof.

The tab 200 is connected to the first side 110 and the current collector 100, and the tab 200 is used for outputting the current generated by the current collector 100. The specific number of the tabs 200 may depend on the actual situation, and the tabs 200 may be exemplarily set to one, two, three, four, etc., which is an example of the embodiment of the present application.

The conductive sheet 300 may have a variety of contours. In some embodiments, the conductive sheet 300 may have a rectangular parallelepiped shape. In other embodiments, the conductive sheet 300 may be polygonal, etc. In other embodiments, the conductive sheet 300 may be in the form of a cylinder or the like. In particular, the embodiment of the present application takes the rectangular conductive sheet 300 as an example, depending on the actual situation. One end of the conductive sheet 300 is connected to the first side 110 and to the current collector 100.

When the current collector 100 is in a winding state, the second side 120 is configured to be spiral and form a plurality of spiral coils 121 distributed from inside to outside. The specific number of the spiral turns 121 may depend on the actual situation, and the spiral turns 121 may be exemplarily provided as two, three, four, etc. The conductive sheet 300 is configured to be capable of being bent to be electrically connected to at least two spiral turns 121 when the current collector 100 is in a wound state, so that discharge between the tab 200 and the current collector 100 can be performed through the conductive sheet 300. In the embodiment of the present application, the transmission distance of the ions on the current collector 100 may be the distance from the discharge position to the tab 200 along the current collector 100, or may be the distance from the discharge position to the conductive sheet 300 along the current collector 100 plus the distance moved on the conductive sheet 300 and the distance from the conductive sheet 300 to the tab 200, and the ions may be transmitted through a path with lower resistance. By reducing the transmission distance of ions on the pole piece 10, a path with lower resistance is selected to change the resistance of the ions during discharge, so as to achieve the effect of reducing the internal resistance of the pole piece 10 and improve the conductivity of the pole piece 10.

A third aspect of the application also provides a battery comprising a pole piece 10 and a housing according to any of the embodiments described above. The housing is used for defining an inner cavity to accommodate the pole piece 10 so as to protect the pole piece 10 from normal operation and isolate the inner cavity from the outside.

It should be noted that the zebra coating and other contents of the housing disclosed in the present application can be referred to the prior art, and will not be described herein.

Furthermore, it should be noted that the description of the present application and the accompanying drawings show preferred embodiments of the present application, but the present application can be embodied in many different forms and is not limited to the embodiments described in the present specification, which are not to be construed as additional limitations on the content of the present application, but are provided for the purpose of making a thorough understanding of the present disclosure. The above-described features are further combined with each other to form various embodiments not listed above, and are considered to be the scope of the present application described in the specification; further, modifications and variations of the present application may be apparent to those skilled in the art in light of the foregoing teachings, and all such modifications and variations are intended to be included within the scope of this application as defined in the appended claims.

Claims (10)

1. A pole piece, comprising:

the current collector comprises a first side edge and a second side edge which are oppositely arranged along the direction perpendicular to the length direction of the current collector;

The electrode lug is connected to the first side edge;

the conducting plate is connected to the second side edge;

The second side edge is configured to be spiral when the current collector is in a winding state and forms a plurality of spiral coils distributed from inside to outside, and the conductive sheet is configured to be capable of being bent to be electrically connected with at least two spiral coils when the current collector is in the winding state.

2. A pole piece as claimed in claim 1, wherein,

The tab is located at a first end of the first side, and the length A of the first end and the length B of the current collector satisfy the following conditions: A/B is more than or equal to 0 and less than or equal to 0.3.

3. A pole piece as claimed in claim 1, wherein,

The conductive sheet is configured to be bendable to be electrically connected to each of the spiral turns when the current collector is in a wound state.

4. A pole piece as claimed in claim 1, wherein,

The current collector comprises an outer wall and an inner wall which are oppositely arranged in the direction perpendicular to the thickness direction of the current collector, when the current collector is in a winding state, the outer wall is configured to be positioned on the outer side of the current collector, the inner wall is configured to be positioned on the inner side of the current collector, and the conducting strip is configured to be capable of being bent to be connected with the outer wall when the current collector is in the winding state.

5. The pole piece of claim 4, wherein the pole piece comprises a plurality of pole pieces,

The conducting strip connect in the inner wall, the conducting strip is located the second tip of second side, the length C of second tip with the length B of mass flow body satisfies: C/B is more than or equal to 0 and less than or equal to 0.3.

6. A pole piece as claimed in claim 1, wherein,

The conductive sheet and the current collector are integrally formed.

7. The pole piece of claim 4, wherein the pole piece comprises a plurality of pole pieces,

The pole piece comprises two conductive pieces, and when the current collector is in a winding state, each conductive piece is outwards bent to two opposite sides.

8. A pole piece as claimed in claim 1, wherein,

The pole piece is an anode pole piece.

9. A pole piece, comprising:

the current collector comprises a first side edge and a second side edge which are oppositely arranged along the direction perpendicular to the length direction of the current collector;

The electrode lug is connected to the first side edge;

the conducting strip is connected to the first side edge;

The second side edge is configured to be spiral when the current collector is in a winding state and forms a plurality of spiral coils distributed from inside to outside, and the conductive sheet is configured to be capable of being bent to be electrically connected with at least two spiral coils when the current collector is in the winding state.

10. A battery, comprising:

The pole piece of any one of claims 1 to 9;

a housing defining an interior cavity to house the pole piece.