CN218548592U - Electrodeless ear soft-package battery - Google Patents

Abstract

The application discloses electrodeless ear soft-package battery, including electric core, anodal encapsulated film, negative pole encapsulated film, anodal encapsulated film and negative pole encapsulated film include conducting layer and non-conducting layer respectively, have the recess that can expose the conducting layer between the non-conducting layer, and electric core includes positive plate and negative pole piece, and the utmost point ear of positive plate and negative pole piece is connected with the conducting layer electricity of anodal encapsulated film, negative pole encapsulated film respectively through the recess through the mode of buckling inside the battery. The utility model provides an electrodeless ear soft-packet battery, the external utmost point ear of positive plate of electric core is connected with anodal encapsulated film conducting layer electricity inside the battery, and negative pole piece utmost point ear is also connected with the conducting layer electricity of negative pole seal form membrane inside the battery, does not draw forth utmost point ear after the encapsulation, and the battery is whole electrified, saves the shared space of utmost point ear, can improve space utilization when in groups.

Description

Electrodeless ear soft-package battery

Technical Field

The application relates to the field of lithium ion batteries, in particular to an electrodeless ear soft-package battery.

Background

The rapid development of lithium ion batteries is promoted by the current reasons of global ecological environment destruction, energy shortage, new energy policy development of all countries in the world and the like. The lithium ion battery has excellent electrochemical properties such as high power density, high working voltage, long service life and the like, so that the lithium ion battery is widely applied to the fields of information technology, electric automobiles, hybrid electric automobiles, aerospace and the like.

With the rapid development of the electric automobile industry, the demand of lithium ion batteries continues to increase substantially as a power source. And the power density and the energy density are improved, and simultaneously, higher requirements are put forward on the safety of the power lithium ion battery. When a novel composite current collector material (consisting of a metal conducting layer, a polymer supporting layer and a metal conducting layer) is in point contact internal short circuit, the conducting layer is cracked and peeled off under the stress of a short circuit point or is instantly fused under the action of short circuit heavy current, and a short circuit current loop is cut off within millisecond; when the surface contact internal short circuit occurs, the supporting layer is heated, melted and contracted on the short circuit surface to form a current collector structure and locally collapse, and a short circuit current loop is cut off before thermal runaway. And the composite current collector intermediate layer adopts lightweight polymer materials, and the weight and the thickness are reduced compared with those of pure metal current collectors, so that more space in the battery is given to active substances, and the energy density of the battery is improved. The composite current collector technology can solve the problem of out-of-control heating caused by short circuit in the battery and also considers the performances of the energy density, the service life and the like of the battery. In addition, the electrode lug structure does not need to be led out from the electrode core with the electrode lug structure, and two large faces of the battery are used as the positive and negative levels of the battery, so that the space utilization rate of the battery is improved, and the grouping convenience, the grouping efficiency, the grouping reliability and the energy density of the battery are improved.

For example, patent CN206758546U discloses an ultra-thin soft-packaged cell without electrode tab, which adopts a form of providing a notch on a conventional aluminum-plastic film to achieve the purpose of electric conduction between the cell and the outer aluminum-plastic film, and the cell and the outer aluminum-plastic film are welded by a metal sheet. However, because the three-layer structure of the aluminum-plastic film structure is compact and has small thickness, the thickness is generally about 100 μm, and the removal of the upper layer and the lower layer on the structure of the existing aluminum-plastic film is difficult to realize; the thickness of the aluminum-plastic film for removing the protective layer and the heat sealing layer is only about 35 mu m, and the welding is difficult; the anode and the cathode are made of aluminum, so that electrochemical corrosion is caused, and the safety problem is easy to occur. Therefore, it is necessary to provide a high-safety electrodeless ear soft-package battery which has a simple structure and is easy to produce in large quantities.

SUMMERY OF THE UTILITY MODEL

In view of this, the present application provides a high-safety electrodeless ear soft-pack battery, which can improve the convenience of battery grouping, the efficiency of battery grouping, and the reliability of battery grouping while reducing the risk of thermal runaway caused by short circuit in the battery.

Specifically, the following technical scheme is adopted

The application provides an electrodeless ear soft package battery, including electric core, anodal packaging film, negative pole packaging film, anodal packaging film and negative pole packaging film parcel electric core, the edge of anodal packaging film and negative pole packaging film is sealed mutually, anodal packaging film and negative pole packaging film include conducting layer and non-conducting layer respectively, conducting layer and non-conducting layer are through glue layer heat-seal with the bonding the stromatolite has the non-conducting layer on the conducting layer of anodal packaging film and negative pole packaging film, the recess that can expose the conducting layer has on the non-conducting layer, electric core includes positive plate and negative pole piece, positive plate and negative pole piece have utmost point ear, utmost point ear is connected with the conducting layer electricity of anodal packaging film, negative pole packaging film respectively through the recess through the mode of buckling inside the battery.

In a specific embodiment, the conductive layer of the positive electrode packaging film or the negative electrode packaging film is located on a side far away from the battery cell, and the non-conductive layer is located on a side close to the battery cell.

In a specific embodiment, the glue layer is MPP.

In a specific embodiment, the tab is connected to the conductive layers of the positive electrode packaging film and the negative electrode packaging film in a bending manner, that is, after a part of the tab is bent, the bent part is electrically connected to the conductive layer through the groove.

In a specific embodiment, the length of the groove is 20% to 40% of the length of the battery cell.

In a specific embodiment, the positive plate or the negative plate has one or two or more than two tabs, and each tab of the positive plate or the negative plate is connected to the conductive layer in the same manner.

In a specific embodiment, the width of the tab is 35% to 63% of the width of the pole piece.

In a specific embodiment, the tab is electrically connected to the conductive layers of the positive electrode packaging film and the negative electrode packaging film through the groove in the battery by bending, which means that the bent portion is directly contacted with or welded to the conductive layers, or the bent portion is bonded to the conductive layers through a conductive adhesive or a conductive tape.

In one particular embodiment, the method of the present invention,

the conducting layer of the anode packaging film is an aluminum foil or a steel foil; or

The conducting layer of the negative electrode packaging film is a copper foil, a nickel foil or a steel foil; or

The non-conductive layer is PP or PET.

In a specific embodiment, the thickness of the non-conductive layer is 0.03mm to 0.10mm; alternatively, the first and second liquid crystal display panels may be,

the thickness of the glue layer between the conducting layer and the non-conducting layer is 0.003mm-0.015 mm; alternatively, the first and second liquid crystal display panels may be,

the thickness of the conducting layer of the anode packaging film and the conducting layer of the cathode packaging film is 0.01mm-0.07 mm.

Drawings

The drawings are included to provide a further understanding of the application and are not to be construed as limiting the application. Wherein:

FIG. 1 is a schematic sectional view of a positive plate

FIG. 2 is a schematic view of the structure of a positive plate

Fig. 3 is a schematic sectional view of the negative plate

FIG. 4 is a schematic view of a structure of a negative electrode plate

FIG. 5 is a schematic cross-sectional view of an electrode-less ear-soft-pack battery

FIG. 6 is a schematic cross-sectional view of a positive electrode packaging film

FIG. 7 is a schematic cross-sectional view of a negative electrode packaging film

List of reference numerals

1. An electric core; 2. a positive electrode encapsulation film; 3. a negative electrode encapsulating film; 11. a positive plate; 12. a negative plate; 13. a diaphragm; 111. a positive electrode coating layer; 112. an anode uncoated region; 113. a positive first foil layer; 114. a substrate layer; 115. a positive second foil layer; 116. the positive plate is externally connected with a tab; 117. welding spots of the positive plate; 121. a negative electrode coating layer; 122. a negative uncoated region/negative plate tab; 123. a negative foil layer; 21. a first conductive layer; 22. a first glue layer; 23. a first non-conductive layer; 24. a first groove; 31. a second conductive layer; 32. a second glue layer; 33. a second non-conductive layer; 34. a second groove.

Detailed Description

The following description of the exemplary embodiments of the present application, taken in conjunction with the accompanying drawings, includes various details of the embodiments of the application for the understanding thereof, which are to be regarded as merely exemplary. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope and spirit of the present application. Also, descriptions of well-known functions and constructions are omitted in the following description for clarity and conciseness.

The application provides a positive plate which can be used for an electrodeless tab soft-package battery, as shown in fig. 1, the positive plate comprises a composite current collector, a coating layer 111, an external tab 116 and an uncoated area 112, as shown in fig. 2, the composite current collector comprises a substrate layer 114, a first foil layer 113 and a second foil layer 115 which are positioned on two sides of the substrate layer, the coating layer 111 is respectively coated on the first foil layer 113 and the second foil layer 115, one end of the composite current collector is provided with the uncoated area 112, as shown in fig. 2, the external tab 116 is welded on the first foil layer 113 of the composite current collector or the uncoated area 112 of the second foil layer 115 through a welding point 117, and in a preferred embodiment, the number of the external tab 116 is two, and the two external tabs are respectively welded on the area of the first foil layer 113 of the composite current collector and the uncoated area 112 of the second foil layer 115.

In a preferred embodiment of the present application,

the first foil layer 113 is made of aluminum foil, nickel foil or stainless steel;

in further preferred embodiments, the second foil layer 115 is an aluminum foil, a nickel foil, or stainless steel; or alternatively

In a further preferred embodiment, the substrate layer is PET or PP;

in a further preferred embodiment, the external tab 116 is aluminum, nickel or stainless steel.

In a more preferred embodiment, the width of the tab is 35% to 63% of the width of the pole piece, and may be, for example, 40%, 45%, 50%, 55%, 60%.

The present application further provides an electrical core, which may be used in an electrodeless ear soft pack battery, in one configuration, comprising one or more positive plates, the positive plates being as described above; and one or more negative pole pieces, the negative pole piece is as shown in fig. 3 and fig. 4, including foil layer 123, coating layer 121 and external tab 122, coating layer 121 coats in the both sides of foil layer 123 respectively, and the one end of foil layer 123 still has uncoated district 122, negative pole piece tab 122 promptly, foil layer 123 is copper foil or nickel foil, and is located the diaphragm between positive pole piece and the negative pole piece.

The application also provides an electrodeless ear soft-package battery. As shown in fig. 5, the battery cell includes a battery cell 1, a positive electrode encapsulating film 2, and a negative electrode encapsulating film 3, where the edges of the positive electrode encapsulating film 2 and the negative electrode encapsulating film 3 are sealed and the battery cell 1 is wrapped. The battery core 1 is a battery core with any structure as described above, and includes one or more positive plates 11, one or more negative plates 12, and a diaphragm 13 located between the positive plates 11 and the negative plates 12, the external tab 116 of the positive plate and the tab 122 of the negative plate are electrically connected with the conductive layer of the packaging film through the grooves of the negative packaging film and the positive packaging film in the battery by bending, and no exposed tab is arranged outside the soft package battery.

In a preferred embodiment, the tabs are electrically connected with the conductive layers of the positive electrode packaging film and the negative electrode packaging film respectively through the grooves in the battery in a bending mode. In a further preferred embodiment, after a portion of the tab is bent, the bent portion is electrically connected to the conductive layer through the groove.

The electrical connection may be any one of the methods in the art that can achieve electrical conduction after connection, and in a preferred embodiment, the electrical connection means that the bent portion is directly contacted or welded with the conductive layer, or the bent portion is adhered to the conductive layer by applying a conductive adhesive or a conductive tape.

The length of the groove is not affected as long as the positive electrode end or the negative electrode end of the battery cell can be electrically connected with the conductive layer of the isolation assembly through the groove, in a preferred embodiment, the length of the groove is 20% to 40% of the length of the battery cell, and may be, for example, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, and under the preferred length of the groove, the connection area of the tab and the conductive layer of the encapsulation film can be ensured to be large enough, the electrical transmission efficiency can be ensured, and meanwhile, the tab is prevented from being too long to interfere with lamination, so that production and manufacturing are affected.

In a specific structure, as shown in fig. 6, the positive electrode encapsulating film 2 in the present application includes three layers, that is, a first conductive layer 21, a first non-conductive layer 23, and a first glue layer 22 located between the first non-conductive layer 23 and the first conductive layer 21, and a groove 24 is formed on the first non-conductive layer 23; when the battery core is wrapped, the first conductive layer 21 is positioned on the outer layer, and the first non-conductive layer 23 is positioned on the inner layer; the first conductive layer 21 is electrically connected to the positive terminal of the positive electrode tab of the battery cell 1 through the groove 24.

The material of the conductive layer of the positive electrode sealing film may be any material capable of conducting electricity used in batteries in the art, and in a preferred embodiment, the conductive layer of the positive electrode sealing film is an aluminum foil or a steel foil.

As shown in fig. 7, the negative electrode encapsulation film 3 in the present application includes three layers of materials, which are a second conductive layer 31, a second non-conductive layer 33, and a second glue layer 32 located between the second non-conductive layer 33 and the second conductive layer 31, and a groove 34 is formed on the second non-conductive layer 33; in the packaging process, the second conductive layer 31 is positioned on the outer layer, and the second non-conductive layer 33 is positioned on the inner layer; the second conductive layer 31 is electrically connected to the negative electrode terminal of the negative electrode tab of the battery cell 1 through the groove 34.

The material of the conductive layer of the negative electrode encapsulation film can be any conductive material used in the battery in the art, and in a preferred embodiment, the conductive layer of the negative electrode encapsulation film is a copper foil, a nickel foil or a steel foil.

The glue layer may be any material known in the art that is capable of bonding the conductive and non-conductive layers together, and in a preferred embodiment, the glue layer is MPP (metallized polypropylene).

The material of the non-conductive layer can be any non-conductive material used in the battery in the art, and in a preferred embodiment, the material of the non-conductive layer is PP (polypropylene) or PET (polyethylene terephthalate).

The thickness of the non-conductive layer is not affected as long as it can be used in a battery, in a preferred non-polar ear soft-pack battery structure, wherein the thickness of the non-conductive layer is 0.03mm to 0.10mm, and may be, for example, 0.04mm, 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm.

The thickness of the glue layer is not affected as long as it can be used in the battery and can bond the above conductive layer and non-conductive layer together, in a preferred non-polar ear soft-pack battery structure, wherein the glue layer has a thickness of 0.003mm to 0.015mm, and may be, for example, 0.004mm, 0.005mm, 0.006mm, 0.007mm, 0.008mm, 0.009mm, 0.01mm, 0.011mm, 0.012mm, 0.013mm, 0.014mm.

The thickness of the conductive layer is not affected as long as the conductive layer can be used in a battery, and in a preferred electrodeless ear soft package battery structure, the thicknesses of the conductive layer of the positive electrode packaging film and the conductive layer of the negative electrode packaging film are 0.01mm-0.07mm, and can be 0.02mm, 0.03mm, 0.04mm, 0.05mm and 0.06mm, for example.

In a preferred electrodeless ear soft package battery structure, the edge sealing pressure of the positive electrode packaging film and the negative electrode packaging film is 0.2-1.0MPa, such as 0.2MPa, 0.3MPa, 0.4MPa, 0.5MPa, 0.6MPa, 0.7MPa, 0.8MPa and 0.9MPa, the time is 2-6s, such as 3s, 4s and 5s, and the temperature is 170-210 ℃. For example, 175 ℃, 180 ℃, 185 ℃, 190 ℃, 195 ℃, 200 ℃ and 205 ℃ can be used.

In a preferred electrodeless ear soft pack battery configuration, wherein the positive encapsulation film 2 comprises a first conductive layer 21, a first non-conductive layer 23 and a first glue layer 22; wherein, the first conductive layer is an aluminum foil layer, the thickness is 0.04mm, the thickness of the first non-conductive layer 23 is 0.06mm, and the thickness of the first glue layer 22 is 0.009mm; the negative electrode packaging film 3 comprises a second conductive layer 31, a second non-conductive layer 33 and a second glue layer 32, wherein the second conductive layer is originally a copper foil layer and has a thickness of 0.04mm, the second non-conductive layer 33 has a thickness of 0.06mm, and the second glue layer 32 has a thickness of 0.009mm; the composite current collector in the positive plate comprises a substrate layer 114, a positive first foil layer 113 and a positive second foil layer 115, wherein the substrate layer is PET and is 10 μm thick, and the positive first foil layer and the positive second foil layer are aluminum and are 1 μm thick. The edge sealing pressure of the anode packaging film 2 and the cathode packaging film 3 is 0.6MPa, the time is 4s, and the temperature is 190 ℃.

Non-polar ear soft-package battery of embodiment

The high-safety electrodeless ear soft-package battery in the embodiment comprises a battery cell, a positive electrode packaging film and a negative electrode packaging film.

The anode plate coating material is NCM ternary material, external tabs are led out from the uncoated area through welding aluminum foil, the cathode plate coating material is graphite, the anode plate tabs and the cathode plate tabs are placed in opposite directions and are sequentially stacked in a crossed mode, and the anode plate coating material and the cathode plate tabs are separated by a diaphragm.

The positive electrode packaging film comprises three layers of materials, namely a conductive layer aluminum foil and a first non-conductive layer (PP) of the positive electrode packaging film, and a first conductive adhesive layer positioned between the conductive layer and the first non-conductive layer (PP), wherein the conductive layer of the positive electrode packaging film is 0.4mm, the thickness of the first non-conductive layer (PP) is 0.06mm, and the thickness of the first conductive adhesive layer is 0.009mm.

The negative electrode packaging film comprises three layers of materials, namely a conductive layer copper foil and a second non-conductive layer (PP) of the negative electrode packaging film, and a second conductive adhesive layer positioned between the conductive layer and the second non-conductive layer (PP) of the negative electrode packaging film, wherein the conductive layer of the negative electrode packaging film is 0.4mm, the thickness of the second non-conductive layer (PP) is 0.06mm, and the thickness of the second conductive adhesive layer is 0.009mm.

When the battery cell is packaged, the edges of the anode packaging film and the cathode packaging film are sealed to wrap the battery cell. The conducting layer of the positive electrode packaging film is positioned on the outer side, the first non-conducting layer (PP) is positioned on the inner side, and the conducting layer of the positive electrode packaging film is electrically connected with an external tab integrated with the positive plate of the battery cell through conducting resin. The conducting layer of the negative electrode packaging film is positioned on the outer side, the second non-conducting layer (PP) is positioned on the inner side, and the conducting layer of the negative electrode packaging film is electrically connected with the negative electrode of the battery cell through conducting resin. The edge sealing pressure of the anode packaging film and the cathode packaging film is 0.6Mpa, the time is 4s, and the temperature is 190 ℃.

The capacity of the manufactured electrodeless ear battery is 15Ah, after formation is finished, 1C constant-current constant-voltage charging is carried out on 5 batteries, the cut-off current is 0.05C, the battery is placed for 1h, a high-temperature-resistant steel with the diameter of 5mm is used for carrying out needle punching test on the battery, the punching speed is 25mm/s, a battery core body is vertically punched, a needle stays in the battery for 1h, the 5 batteries are not ignited and not exploded, and the surface temperature of the battery is 57 ℃ at most.

The utility model provides an electrodeless ear soft-packet battery, the external utmost point ear of positive plate of electric core is connected with anodal encapsulated film conducting layer electricity inside the battery, and negative pole piece utmost point ear is also connected with the conducting layer electricity of negative pole seal form membrane inside the battery, does not draw forth utmost point ear after the encapsulation, and the battery is whole electrified, saves the shared space of utmost point ear, can improve the space utilization when in groups.

The electrodeless ear soft-package battery further uses the composite current collector as the positive plate current collector, reduces the risk of short circuit in the battery, and improves the safety and reliability of the battery in the use process. The external electrode lug of the positive plate of the battery core is electrically connected with the conducting layer of the positive encapsulation film in the battery, so that the composite current collector is convenient to conduct, the electrode lug of the negative plate is electrically connected with the conducting layer of the negative encapsulation film in the battery, the electrode lug is not led out after the battery is encapsulated, and meanwhile, the composite current collector ensures the safety and reliability of the battery.

Although the embodiments of the present application have been described above with reference to the accompanying drawings, the present application is not limited to the above-described embodiments and application fields, and the above-described embodiments are illustrative, instructive, and not restrictive. Those skilled in the art, having the benefit of this disclosure, may effect numerous modifications to the disclosed embodiments without departing from the scope of the claimed invention, as defined by the appended claims.

Claims (11)

1. The utility model provides an electrodeless ear soft-packet battery, includes electric core, anodal packaging film, negative pole packaging film, anodal packaging film and negative pole packaging film parcel electric core, anodal packaging film and negative pole packaging film's edge is sealed mutually, anodal packaging film and negative pole packaging film include conducting layer and non-conducting layer respectively, conducting layer and non-conducting layer are through the hot-seal of glue layer with the bonding the stromatolite has the non-conducting layer on the conducting layer of anodal packaging film and negative pole packaging film, the recess that can expose the conducting layer has on the non-conducting layer, electric core includes positive plate and negative pole piece, positive plate and negative pole piece have utmost point ear, utmost point ear is connected with the conducting layer electricity of anodal packaging film, negative pole packaging film respectively through the recess through the mode of buckling in battery inside.

2. The battery of claim 1, wherein the conductive layer of the positive or negative encapsulation film is located on a side away from the cell, and the non-conductive layer is located on a side close to the cell.

3. The cell defined in claim 1 or claim 2, wherein the glue layer is MPP.

4. The battery according to claim 1 or 2, wherein the tab is connected to the conductive layers of the positive electrode packaging film and the negative electrode packaging film by bending, that is, after a part of the tab is bent, the bent part is electrically connected to the conductive layer through the groove.

5. The battery of claim 1 or 2, wherein the length of the groove is 20% to 40% of the length of the cell.

6. The battery according to claim 1 or 2, wherein the positive or negative electrode tab has one or two or more tabs, and each tab of the positive or negative electrode tab is connected to the conductive layer in the same manner.

7. The battery according to claim 1 or 2, wherein the positive electrode sheet comprises a composite current collector.

8. The battery of claim 1 or 2, wherein the tab has a width of 35% to 63% of the width of the pole piece.

9. The battery according to claim 4, wherein the tabs are electrically connected to the conductive layers of the positive electrode packaging film and the negative electrode packaging film through the grooves in the battery by bending, which means that the bent portions are directly contacted or welded with the conductive layers, or the bent portions are bonded with the conductive layers through a conductive adhesive or a conductive tape.

10. The battery according to claim 1 or 2,

the conducting layer of the anode packaging film is an aluminum foil or a steel foil; or alternatively

The conducting layer of the negative electrode packaging film is a copper foil, a nickel foil or a steel foil; or alternatively

The non-conductive layer is PP or PET.

11. The battery according to claim 1 or 2, wherein the thickness of the non-conductive layer is 0.03mm to 0.10mm; alternatively, the first and second electrodes may be,

the thickness of the glue layer between the conducting layer and the non-conducting layer is 0.003mm-0.015 mm; alternatively, the first and second electrodes may be,

the thickness of the conducting layer of the anode packaging film and the conducting layer of the cathode packaging film is 0.01mm-0.07 mm.

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