CN211045591U

CN211045591U - Battery cell and battery

Info

Publication number: CN211045591U
Application number: CN201921862579.7U
Authority: CN
Inventors: 邹邦坤; 屈长明; 杨帆
Original assignee: Ningde Amperex Technology Ltd
Current assignee: Ningde Amperex Technology Ltd
Priority date: 2019-10-31
Filing date: 2019-10-31
Publication date: 2020-07-17
Anticipated expiration: 2029-10-31

Abstract

The utility model discloses an electricity core and battery, electricity core includes: the pole piece comprises a current collector, a first substance layer and a second substance layer, wherein the first substance layer is coated on the first surface of the current collector, the second substance layer is coated on the second surface of the current collector, the first surface and the second surface are oppositely arranged, and the first substance layer is provided with a first groove; the tab is arranged in the first groove and is electrically connected with the current collector; and the electrolyte layer is arranged above the lug to prevent the lug from being electrically connected with other conductive substances. From this, through first recess, utmost point ear and electrolyte layer cooperation, can avoid the inside short circuit that takes place of electric core, can promote the security performance of electric core to, through with utmost point ear embedded in first recess, can reduce the electric core thickness of occupying because of utmost point ear leaks outward, thereby can promote the volume energy density of electric core.

Description

Battery cell and battery

Technical Field

The utility model belongs to the technical field of the battery and specifically relates to a battery of electricity core and having this electricity core is related to.

Background

Lithium ion batteries have a series of advantages of large energy density per unit volume mass, high average output voltage, long service life, wide working temperature range and the like in the existing energy storage equipment, and are widely applied.

In the related art, in order to make the battery have higher energy density, more active substances are carried under a limited size space, but an area which is not coated with the active substances is generally reserved at the head of the pole piece for welding a pole lug so as to be connected with an external circuit.

Welded utmost point ear department has usually to weld and prints highly higher and welding burr scheduling problem, can bring and impale the risk that barrier film 8 leads to short circuit in the electric core, among the prior art, in order to avoid the inside short circuit that takes place of electric core, pastes thick adhesive tape in negative pole utmost point ear department, pastes thick adhesive tape on the positive pole diaphragm that corresponds simultaneously, the volume energy density of the extra loss electric core of like this.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, an object of the present invention is to provide an electrical core, which can avoid short circuit inside the electrical core, and can also improve the volume energy density of the electrical core.

The utility model discloses a battery is further proposed.

According to the utility model discloses an electricity core includes: the pole piece comprises a current collector, a first substance layer and a second substance layer, wherein the first substance layer is coated on the first surface of the current collector, the second substance layer is coated on the second surface of the current collector, the first surface and the second surface are oppositely arranged, and the first substance layer is provided with a first groove; the tab is arranged in the first groove and is electrically connected with the current collector; and the electrolyte layer is arranged above the lug to prevent the lug from being electrically connected with other conductive substances.

According to the utility model discloses an electric core, through first recess, utmost point ear and electrolyte layer cooperation, can avoid the inside short circuit that takes place of electric core, can promote the security performance of electric core to, through with utmost point ear embedded in first recess, can reduce the electric core thickness of occupying because of utmost point ear leaks outward, thereby can promote the volume energy density of electric core.

In some examples of the invention, the electrolyte layer has a projected area on the first substance layer.

In some examples of the present invention, the electrolyte layer is disposed on a surface of the tab, and there is no projected area on the first material layer.

In some examples of the invention, the current collector is further formed with a first empty foil area not coated with the first substance layer, the first empty foil area being provided with the electrolyte layer.

In some examples of the invention, the electrolyte layer is connected to the first substance layer, or the electrolyte layer has a projected area on the first substance layer.

In some examples of the present invention, the second material layer is provided with a second groove opposite to the first groove, and the electrolyte layer is provided in the second groove, or the electrolyte layer partially or completely covers the second groove.

In some examples of the present invention, the current collector is further formed with a second empty foil region not coated with the second material layer, the second empty foil region being provided with the electrolyte layer.

In some examples of the present invention, the electrolyte layer is connected to the second material layer, or the electrolyte layer has a projected area on the second material layer.

In some examples of the present invention, the ionic conductivity of the electrolyte layer is 10 or more^-5s/cm, the material of the electrolyte layer comprises at least one of crystalline lithium ion solid electrolyte, glassy solid electrolyte or organic polymer solid electrolyte.

In some examples of the present disclosure, the crystalline lithium ion solid electrolyte has at least one of an L ISICON structure, an NASICON structure, or a perovskite-type structure, and the glassy solid electrolyte includes at least one of an oxide or a sulfide.

According to the utility model discloses a battery, include electric core and accept the packaging shell of electric core, electric core is foretell electric core.

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

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic view of a winding structure of a battery cell according to an embodiment of the present invention;

fig. 2 is a schematic view of a winding structure in which a tab of a battery cell is disposed at another position according to an embodiment of the present invention;

figure 3 is a cross-sectional view of one embodiment of a pole piece, tab, and electrolyte layer of a battery cell according to an embodiment of the present invention;

FIG. 4 is a top view of FIG. 3;

figure 5 is a cross-sectional view of another embodiment of a pole piece, tab and electrolyte layer of a battery cell according to an embodiment of the present invention;

FIG. 6 is a top view of FIG. 5;

figure 7 is a cross-sectional view of another embodiment of a pole piece, tab and electrolyte layer of a battery cell according to an embodiment of the present invention;

fig. 8 is a top view of fig. 7.

Reference numerals:

an electric core 10;

a pole piece 1; a current collector 11;

first substance layer 12; a first groove 121;

a second substance layer 13; a second groove 131;

2, a tab; an electrolyte layer 3; a first empty foil area 4; a second empty foil area 5; a cathode plate 6; an anode plate 7; and a barrier film 8.

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 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 drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

The following describes the battery cell 10 according to an embodiment of the present invention with reference to fig. 1 to 8.

As shown in fig. 1 to 8, the battery cell 10 according to the embodiment of the present invention includes: pole piece 1, tab 2 and electrolyte layer 3. The electrode sheet 1 may be a cathode electrode sheet (or a positive electrode sheet) 6, or an anode electrode sheet (or a negative electrode sheet) 7, for example, the electrode sheet 1 may be the cathode electrode sheet 6, the electrode sheet 1 includes a current collector 11, a first material layer 12 and a second material layer 13, the first material layer 12 is coated on a first surface of the current collector 11, the second material layer 13 is coated on a second surface of the current collector 11, the first surface and the second surface are oppositely disposed, it should be noted that, when the upper surface of the current collector 11 is the first surface, the lower surface of the current collector 11 is the second surface, and when the upper surface of the current collector 11 is the second surface, the lower surface of the current collector 11 is the first surface, for example: the upper surface of the current collector 11 is a first surface, the lower surface of the current collector 11 is a second surface, and the first material layer 12 is provided with a first groove 121. Utmost point ear 2 sets up in first recess 121, and the welding position of utmost point ear 2 can be adjusted, and utmost point ear 2 can be located the head of pole piece 1, also can be located the middle part of pole piece 1, and utmost point ear 2 is connected with mass flow body 11 electricity moreover, and electrolyte layer 3 sets up in utmost point ear 2 top, and electrolyte layer 3 can prevent that utmost point ear 2 from taking place to be connected with other conducting material electricity.

Specifically, the lithium ion battery includes a battery cell 10, the battery cell 10 may be formed by sequentially winding or stacking a cathode plate 6, an isolation film 8, and an anode plate 7, and the isolation film 8 is used to realize electronic insulation and ion conduction between the cathode and the anode, thereby ensuring that the battery cell 10 can be charged and discharged safely and effectively.

The electrolyte layer 3 is arranged above the tab 2 to replace the original rubberizing mode (such as rubberizing paper is pasted above the tab 2), and because the electrolyte layer 3 has the characteristics of conducting lithium ions but not conducting ions, the cathode active substances at the original rubberizing paper bonding position can be effectively utilized, and the energy density of the battery cell 10 can be improved; in addition, the electrolyte layer 3 also has the characteristics of high strength, high temperature, high voltage, oxidation resistance and the like, so that the risk of piercing the diaphragm due to welding mark height exceeding the specification and welding mark burrs during welding can be avoided, short circuit between the aluminum foil current collector and the anode diaphragm due to shrinkage of the isolating film 8, oxidation of adhesive paper and the like in the battery core under the high-temperature condition can be avoided, and the safety and reliability can be greatly improved; meanwhile, the high requirements of the size precision of the rubberizing and the detection of the missing rubberizing on equipment can be avoided, and the production efficiency of the battery is improved.

In addition, through setting up utmost point ear 2 in first recess 121, can cancel the empty foil district of welding utmost point ear among the prior art (if set up at the initiating terminal of mass flow body or receive the tail end), can reduce utmost point ear 2 and leak the electric core 10 thickness that occupies outward, thereby can further promote the volume energy density of electric core 10, and, through setting up electrolyte layer 3, can avoid the inside short circuit that takes place of electric core 10, can reduce the internal resistance of electric core 10 and the temperature rise when charging and discharging, can prevent electric core 10 high temperature, thereby can avoid electric core 10 to burn, and further can further promote the security performance of electric core 10.

In some embodiments of the present invention, as shown in fig. 3, in the up-down direction, the electrolyte layer 3 has a projection area on the first material layer 12, that is, in the up-down direction shown in fig. 3, the projection of the electrolyte layer 3 and the projection of the first material layer 12 have a coincidence area, so that the arrangement can ensure that the tab 2 and the empty foil area where the tab 2 is welded are all covered, and the tab 2 can be prevented from being electrically connected with other conductive materials, so as to better prevent the short circuit of the battery cell 10.

In some embodiments of the present invention, as shown in fig. 5-7, the electrolyte layer 3 may be disposed on the surface of the tab 2, and the electrolyte layer 3 has no projection area on the first material layer 12, and it can also be understood that, in the up-down direction, the projection of the electrolyte layer 3 and the projection of the first material layer 12 do not have an overlapping area (or no connection area exists between the electrolyte layer 3 and the first material layer 12), at this time, the electrolyte layer 3 may cover the opening of the first groove 121, so that the tab 2 can be prevented from being electrically connected with other conductive materials, and the short circuit of the battery cell 10 can be further prevented.

In some embodiments of the present invention, as shown in fig. 3, the current collector 11 may also be formed with a first empty foil region 4 not coated with the first substance layer 12, and the first empty foil region 4 may be provided with an electrolyte layer 3, for example: first empty foil district 4 can coat or paste electrolyte layer 3, electrolyte layer 3 can be partly coated or the coating is on first empty foil district 4 entirely, lithium ion can be led to this electrolyte layer 3, it is not conductive, can make the negative pole active material of adhesive tape bonding department obtain effective utilization, thereby can further promote the energy density of electric core 10, and electrolyte layer 3 possesses high strength, characteristics such as oxidation resistance, the welding mark height is surpassed specification and the risk that the welding mark burr leads to impaling barrier film 8 when can avoiding welding, electric core 10 is inside to take place the short circuit between aluminium foil collector 11 and the anode plate 71.

In some embodiments of the present invention, as shown in fig. 3, the electrolyte layer 3 is connected to the first material layer 12, at this time, in the up-down direction, the projection of the electrolyte layer 3 does not have a coincidence region with the projection of the first material layer 12, or the electrolyte layer 3 has a projection region on the first material layer 12, so that the risk that the welding mark height exceeds the specification and the welding mark burr causes piercing the isolation film 8 during welding can be further avoided, the short circuit between the anode plate 71 and the cathode plate 61 inside the electric core 10 can be further avoided, and the safety of the electric core 10 can be further ensured.

In some embodiments of the present invention, as shown in fig. 3 and fig. 5, the second material layer 13 may be provided with a second groove 131 opposite to the first groove 121, the electrolyte layer 3 may be disposed in the second groove 131, or the electrolyte layer 3 partially covers or completely covers the second groove 131, such arrangement can avoid the pole piece 1 from being electrically connected with other conductive materials, and can avoid the electrical core 10 from being short-circuited, so as to ensure the working reliability of the electrical core 10. Of course, as shown in fig. 8, the electrolyte layer 3 may not be provided at the second groove 131.

In some embodiments of the present invention, as shown in fig. 3, the current collector 11 may further be formed with a second empty foil area 5 without coating the second material layer 13, the second empty foil area 5 may be provided with an electrolyte layer 3, so as to better utilize the cathode active material of the original adhesive tape bonding part, thereby further improving the volumetric energy density of the battery cell 10, and further avoiding the risk that the solder mark height exceeds the specification and the solder mark burr causes piercing the isolation film 8 during the welding, thereby further avoiding the short circuit inside the battery cell 10.

In some embodiments of the present invention, the electrolyte layer 3 is connected to the second material layer 13, at this time, as shown in fig. 3, in the up-down direction, the projection of the electrolyte layer 3 does not have an overlapping region with the projection of the second material layer 13, or the electrolyte layer 3 has a projection region on the second material layer 13, at this time, in the up-down direction, the projection of the electrolyte layer 3 and the projection of the second material layer 13 have an overlapping region, so that the risk that the welding height exceeds the specification and the welding burr causes piercing the isolation film 8 during welding can be further avoided, and the short circuit between the anode plate 7 and the cathode plate 6 inside the electric core 10 can be further avoided, so as to further ensure the safety in use of the electric core 10.

The thickness of the first material layer 12 and the second material layer 13 may be in the range of 0.1 μm to 500 μm, and the material layer on the tab 2 side needs to be thicker than the tab 2 to be welded, and the material layer on the non-tab 2 side needs to be thicker than 0.1 μm. The length dimension of each of the first and

second grooves

121 and 131 is in the range of 3mm to 100mm, and the width dimension of each of the first and

second grooves

121 and 131 is in the range of 3mm to 100 mm.

In some embodiments of the present invention, the electrolyte layer 3 may be a lithium ion solid electrolyte, and the ionic conductivity of the electrolyte layer 3 is 10 or more^-5s/cm, the material of the electrolyte layer 3 comprises crystalline lithiumThe ionic conductivity test method can use an alternating current impedance method for testing after electrolyte tabletting, and a voltage stability window of a cyclic voltammetry test meets 3.5V vs, L i + or more.

In some embodiments of the present disclosure, the crystalline lithium ion solid electrolyte may have at least one of an L ISICON (lithium fast ion conductor) structure, an NASICON (sodium fast ion conductor) structure, or a perovskite-type structure, and the glassy solid electrolyte may include at least one of an oxide or a sulfide.

According to the utility model discloses battery, including electric core 10 and the packaging shell of acceping electric core 10, electric core 10 is the electric core 10 of above-mentioned arbitrary embodiment, and electric core 10 sets up in the packaging shell, replaces original adhesive tape through adopting electrolyte layer 3, can improve the volume energy density of battery and promote the security performance of battery.

Specifically, when a battery is prepared, the cathode plate 6, the separator 8 and the anode plate 7 are wound or stacked according to production requirements, the separator 8 is used for separating the cathode plate 6 and the anode plate 7, the wound or stacked battery cell 10 is accommodated in an aluminum-plastic film, then electrolyte is injected, a finished battery cell 10 is obtained after vacuum baking and formation, and the battery can be obtained after the battery cell 10 is processed.

In summary, compared with the battery cell 10 in the prior art, the battery cell 10 of the present application uses the electrolyte layer 3 to replace the original adhesive tape, and the electrolyte layer 3 has the characteristics of lithium ion conduction, non-electron conduction, high strength, high voltage oxidation resistance, no shrinkage at high temperature, higher safety and the like, so that the active material layer at the adhesive position of the adhesive tape can be effectively utilized, the energy density of the battery cell 10 can be improved, and the safety performance of the battery cell 10 can also be improved; in addition, the high requirements of the size precision of the rubberizing and the detection of the missing rubberizing on the equipment can be avoided, and the production efficiency of the battery is improved.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like 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 present invention. In this specification, the schematic representations of the terms used above do not necessarily 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.

While embodiments of the present 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 pole piece comprises a current collector, a first substance layer and a second substance layer, wherein the first substance layer is coated on the first surface of the current collector, the second substance layer is coated on the second surface of the current collector, the first surface and the second surface are oppositely arranged, and the first substance layer is provided with a first groove;

the tab is arranged in the first groove and is electrically connected with the current collector; and

and the electrolyte layer is arranged above the lug to prevent the lug from being electrically connected with other conductive substances.

2. The cell of claim 1, wherein the electrolyte layer has a projected area on the first substance layer.

3. The cell of claim 1, wherein the electrolyte layer is disposed on a surface of the tab and has no projected area on the first substance layer.

4. The cell of claim 1, wherein the current collector is further formed with a first empty foil region that is not coated with the first substance layer, the first empty foil region being provided with the electrolyte layer.

5. The electrical core of claim 4, wherein the electrolyte layer is coupled to the first substance layer or has a projected area on the first substance layer.

6. The cell of claim 1, wherein the second material layer is provided with a second groove opposite the first groove, wherein the electrolyte layer is disposed within the second groove, or wherein the electrolyte layer partially or completely covers the second groove.

7. The electrical core of claim 1, wherein the current collector is further formed with a second empty foil region that is not coated with the second layer of material, the second empty foil region being provided with the electrolyte layer.

8. The electrical core of claim 7, wherein the electrolyte layer is connected to the second material layer, or wherein the electrolyte layer has a projected area on the second material layer.

9. The battery cell of claim 1, wherein the ionic conductivity of the electrolyte layer is 10 "5 s/cm or greater, and the material of the electrolyte layer comprises at least one of a crystalline lithium ion solid electrolyte, a glassy solid electrolyte, or an organic polymer solid electrolyte.

10. The cell of claim 9, wherein the crystalline lithium ion solid electrolyte has at least one of an L ISICON structure, an NASICON structure, or a perovskite structure, and the glassy solid electrolyte comprises at least one of an oxide or a sulfide.

11. A battery comprising a cell and a package housing containing the cell, the cell being according to any one of claims 1-10.