CN218472006U

CN218472006U - Button cell of foil cladding epilogue

Info

Publication number: CN218472006U
Application number: CN202221822056.1U
Authority: CN
Inventors: 赵裕锋
Original assignee: Guangdong Vdl New Energy Co ltd
Current assignee: Guangdong Vdl New Energy Co ltd
Priority date: 2022-07-15
Filing date: 2022-07-15
Publication date: 2023-02-10
Anticipated expiration: 2032-07-15

Abstract

The utility model discloses a button cell of foil cladding epilogue, it relates to coiling formula steel-clad button cell field, it includes the positive plate, negative pole piece and barrier film are around the electric core body of book formation, the positive plate includes anodal foil and the anodal active material of coating on anodal foil, the negative pole piece includes negative pole foil and the negative pole active material of coating on the negative pole foil, and be provided with the battery case of holding tank, one side of anodal foil is provided with first no material district, one side of negative pole foil is provided with the no material district of second, all do not coat anodal active material or negative pole active material on first no material district and the no material district of second, first no material district or the cladding of no material district of second are in the outmost and laminating of electric core body in the holding tank, battery case be with first no material district or the no material district polarity assorted anodal shell or negative pole shell, the utility model discloses can reduce battery direct current impedance DCR, reduce battery alternating current impedance ACR, thereby can improve the fast performance of battery.

Description

Button cell of foil cladding epilogue

Technical Field

The utility model relates to a coiling formula box hat button cell technical field especially relates to a button cell of foil cladding epilogue.

Background

At present, a winding type steel shell button cell generally adopts a diaphragm cathode double-film winding mode, and is assembled into a shell after being manufactured into a winding core. Because the mode of coating the diaphragm on the negative electrode double-film is adopted, 2 layers of diaphragms and 1 layer of negative electrode active substances are added on the outmost layer of the winding core, the space volume in the battery is easily occupied, and the improvement of energy density is not facilitated. And the mode of welding a single lug by adopting the positive and negative pole pieces is adopted, and because the contact area of the welding spot between the lug welding part and the shell cover is limited, the battery has high reaction activity of the pole piece close to the lug area and low reaction activity of the pole piece far away from the lug area in the charging and discharging process, so that the polarization effect of the battery is large, and the battery is not beneficial to high-rate discharging and quick charging.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome the above-mentioned defect among the prior art, provide a button cell of foil cladding epilogue, its this technical scheme can reduce battery direct current impedance DCR, reduce battery alternating current impedance ACR to can improve the battery and fill the performance soon, improve battery multiplying power discharge performance and can also promote inner space utilization.

In order to realize the above purpose, the utility model provides a button cell of foil cladding epilogue, including positive plate, negative pole piece and barrier film around the electric core body of rolling up formation, the barrier film will positive plate and negative pole piece separate, the positive plate includes anodal foil and the anodal active material of coating on anodal foil, the negative pole piece includes negative pole foil and the negative pole active material of coating on the negative pole foil to and be provided with the battery case of holding tank, and one side of anodal foil is provided with first no material district, and one side of negative pole foil is provided with the second and does not have anodal active material of coating or negative pole active material on first no material district and the second no material district, and the cladding of first no material district or second no material district is outmost at electric core body, and the outmost laminating of first no material district or second no material district is in the holding tank, battery case be with first no material district or second no material district polarity assorted anodal shell or negative pole shell.

In the above technical scheme, the battery further comprises an anode single film connected with the anode foil and a cathode single film connected with the cathode foil, wherein the anode single film or the cathode single film is coated on the outermost layer of the battery cell body.

In the above technical scheme, the lithium battery further comprises a positive electrode tab led out from the positive electrode foil and a negative electrode tab led out from the negative electrode foil.

In the technical scheme, the first material-free area is provided with a welding point welded with the anode tab, and the second material-free area is provided with a welding point welded with the cathode tab.

In the above technical scheme, the connection mode of the positive electrode tab or the negative electrode tab and the outside is laser welding, resistance welding or ultrasonic welding.

In the above technical scheme, the negative foil is a copper foil.

In the above technical scheme, the anode foil is an aluminum foil.

Compared with the prior art, the beneficial effects of the utility model reside in that:

1. this technical scheme adopts the ending mode of anodal foil or negative pole foil or anodal simple membrane or negative pole simple membrane, and be provided with first no material district on the anodal foil, be provided with the second no material district on the negative pole foil, first no material district or second no material district mainly used cladding are outmost at electric core body, when assembling electric core body into battery case's holding tank, electric core body's outmost foil and homopolar battery case's holding tank inner wall ability in close contact with, increase homopolar pole piece and homopolar casing metal contact area, this technical scheme can reduce battery direct current impedance DCR, reduce battery alternating current impedance ACR, thereby can improve battery fast-charging performance, improve battery multiplying power discharge performance, reduce battery charge-discharge polarization effect.

2. Because the outermost layer of this technical scheme's electric core body can laminate on the inner wall of battery case holding tank to can show and promote inside space utilization, thereby can make the volume of battery littleer.

3. Regardless of whether the coating is the positive foil or the negative foil on the outermost layer of the battery cell body, the battery can be assembled by changing the polarity of the battery shell, so that the production efficiency of the battery can be greatly improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a foil-coated terminal button cell adopting a positive foil termination manner according to the present invention;

fig. 2 is a schematic structural diagram of a foil-coated button cell adopting a negative foil ending mode;

fig. 3 is a schematic structural view of a foil-coated button cell adopting a positive single-film ending mode;

fig. 4 is a schematic structural diagram of a foil-coated button cell adopting a negative electrode single-film terminating manner;

fig. 5 is a schematic structural diagram of a cell body provided by the present invention;

fig. 6 is an assembly schematic diagram of a button cell with foil covering ending provided by the present invention.

The reference numbers of the figures are: 10. a cell body; 20. a battery case; 1. a positive plate; 11. a first material-free zone; 2. a negative plate; 21. a second material-free zone; 4. a positive electrode tab; 5. and a negative electrode tab.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that all the directional indicators (such as up, down, left, right, front, back \8230;) in the embodiments of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the attached drawings), and if the specific posture is changed, the directional indicator is changed accordingly.

In the present application, unless expressly stated or limited otherwise, the terms "connected" and "fixed" are to be construed broadly, e.g., "fixed" may be fixedly connected or detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" appearing throughout includes three juxtapositions, exemplified by "A and/or B" including either A or B or both A and B. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory to each other or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

As shown in fig. 1 to 6, the present embodiment provides a foil-covered terminal button cell, which includes a cell body 10 and a battery case 20 provided with a receiving groove.

Referring to fig. 5, the cell body 10 is formed by winding the positive electrode sheet 1, the negative electrode sheet 2, and the separator. The isolating membrane is used for isolating the positive plate 1 and the negative plate 2, the positive plate 1 comprises a positive foil and a positive active substance coated on the positive foil, and the corresponding negative plate 2 comprises a negative foil and a negative active substance coated on the negative foil. Preferably, the negative electrode foil is a copper foil, and the positive electrode foil is an aluminum foil. In addition, a first non-material region 11 is arranged on one side of the positive foil, a second non-material region 21 is arranged on one side of the negative foil, neither the first non-material region 11 nor the second non-material region 21 is coated with a positive active material or a negative active material, the first non-material region 11 or the second non-material region 21 is coated on the outermost layer of the cell body 10, the outermost layer of the first non-material region 11 or the second non-material region 21 is attached in the accommodating groove, and the battery case 20 is a positive electrode case or a negative electrode case with the polarity matched with that of the first non-material region 11 or the second non-material region 21. Referring to fig. 4-5, the present embodiment preferably further includes a positive electrode single film connected to the positive electrode foil and a negative electrode single film connected to the negative electrode foil, wherein the positive electrode single film or the negative electrode single film is coated on an outermost layer of the battery cell body.

Specifically, when the positive electrode active material or the negative electrode active material is coated on the positive electrode foil or the negative electrode foil, a first material-free area 11 and a second material-free area 21 at the tail part or an area of a positive electrode single film or a negative electrode single film at the tail part are reserved, the positive electrode plate 1 and the negative electrode plate 2 are obtained after the coating is finished, then the positive electrode plate 1 or the negative electrode plate 2 is cut, and a positive electrode tab 4 and a negative electrode tab 5 are correspondingly spot-welded in the first material-free area 11 and the second material-free area 21, as shown in fig. 1 and fig. 2. Then, the positive plate 1, the negative plate 2 and the isolation film are wound and molded to obtain the battery cell body 10, and at this time, the outermost layer of the battery cell body 10 is the second non-material region 21 on the negative foil or the first non-material region 11 on the positive foil. Then assemble electric core body 10 into battery case 20's holding tank, it is corresponding, if electric core body 10 is negative pole foil ending mode then assemble into the negative pole casing, if electric core body 10 is positive pole foil ending mode then assemble into the positive pole casing. The battery cell body 10 of this embodiment adopts the ending mode of the positive foil or the negative foil or the positive single film or the negative single film, and the positive foil is provided with the first non-material area 11, and the negative foil is provided with the second non-material area 21, no matter the coating is the first non-material area 11 or the second non-material area 21 at the outmost layer of the battery cell body 10, please refer to fig. 6, when the battery cell body 10 is assembled into the holding tank of the battery case 20, the outmost layer foil of the battery cell body 10 and the inner wall of the holding tank of the battery case 10 with the same polarity can be in close contact, the metal contact area of the pole piece with the same polarity and the metal contact area of the battery case are increased, the battery impedance is reduced, the SEI film forming quality is improved, the quick charging performance of the battery is improved, the multiplying power discharging performance of the battery is improved, the charging and discharging polarization effect of the battery is reduced, the utilization ratio of the internal space is improved, the energy density is improved, and the battery cycle electrical performance is improved.

The present embodiment also preferably includes a positive electrode tab 4 extending from the positive electrode foil and a negative electrode tab 5 extending from the negative electrode foil. The first material-free area 11 is provided with a welding point welded with the positive electrode tab 4, and the second material-free area 21 is provided with a welding point welded with the negative electrode tab 5, so that the positive electrode tab 4 or the negative electrode tab 5 can be conveniently led out from the positive electrode foil or the negative electrode foil. In addition, the connection mode of the positive electrode tab 4 or the negative electrode tab 5 and the outside can be laser welding, resistance welding or ultrasonic welding.

The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be equivalent replacement modes, and all should be included in the protection scope of the present invention.

Claims

1. The utility model provides a button cell of foil material cladding epilogue, includes positive plate (1), negative pole piece (2) and barrier film and winds electric core body (10) of formation, the barrier film will positive plate (1) and negative pole piece (2) separate, positive plate (1) includes positive foil material and the anodal active material of coating on positive foil material, negative pole piece (2) include negative foil material and the negative pole active material of coating on the negative foil material to and be provided with battery case (20) of holding tank, its characterized in that, one side of positive foil material is provided with first no material district (11), and one side of negative foil material is provided with second no material district (21), and first no material district (11) and second no material are distinguished and all do not coat anodal active material or negative pole active material, and first no material district (11) or second no material district (21) cladding are outermost at electric core body, and the outermost laminating of first no material district (11) or second no material district (21) is in the holding tank, battery case (20) is the anodal polarity of first no material district (11) or second no material district (21) phase-match.

2. The foil-coated terminal button cell of claim 1, further comprising a positive electrode single film disposed on the first material-free zone (11) or a negative electrode single film disposed on the second material-free zone (21), wherein the positive electrode single film or the negative electrode single film is coated on the outermost layer of the cell body.

3. The foil-coated button cell battery as claimed in claim 1, further comprising a positive tab (4) extending from the positive foil and a negative tab (5) extending from the negative foil.

4. A foil-clad button cell as in claim 3, wherein the first material-free zone is provided with a weld to the positive tab (4) and the second material-free zone is provided with a weld to the negative tab (5).

5. The foil-coated terminal button cell as claimed in claim 3, wherein the positive electrode tab (4) or the negative electrode tab (5) is connected to the outside by laser welding, resistance welding or ultrasonic welding.

6. The foil-coated button cell battery as claimed in claim 1, wherein the negative foil is copper foil.

7. The foil-coated button cell battery as claimed in claim 1, wherein the positive foil is aluminum foil.