CN218005199U - Composite electrode pole piece, battery core and bipolar battery - Google Patents

Abstract

The utility model provides a composite electrode pole piece and electric core, bipolar battery. The composite electrode plate comprises an electrode plate body and an insulating ring, wherein the insulating ring is arranged around the periphery of the electrode plate body; and/or the insulating ring is arranged on the edge of at least one side surface of the electrode pole piece body. The insulating ring is arranged at the preset position of the composite electrode pole piece, and when the composite electrode pole piece is assembled in the bipolar battery, the insulating ring can better separate different electrode pole piece bodies, so that the risk of electronic short circuit of the battery can be remarkably reduced, and the composite electrode pole piece can be used for providing the bipolar battery with stable performance.

Description

Composite electrode pole piece, battery core and bipolar battery

Technical Field

The utility model relates to a battery technology field, concretely relates to combined electrode pole piece and electric core, bipolar battery.

Background

The bipolar electrode pole pieces are formed by respectively coating active substances with different polarities on two opposite surfaces of a bipolar current collector and stacking a plurality of bipolar pole pieces and a plurality of solid electrolytes in series, and the battery structure reduces the invalid assembling space of the battery and reduces the connection resistance, so that the bipolar battery has the advantages of high voltage, high energy density, high overcurrent capacity and the like. The battery has the risk that different bipolar pole pieces contact with each other to cause short circuit of the battery. Therefore, it is necessary to provide the electrodes and the solid electrolyte with structures independent of each other. At present, different bipolar pole pieces are usually separated by a solid electrolyte layer, but this method is liable to cause different (especially adjacent) solid electrolyte layers to contact with each other, so that the battery is subjected to ionic short circuit.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model provides a combined electrode pole piece and electric core, bipolar battery. The preset position of the composite electrode pole piece is provided with the insulating ring, when the composite electrode pole piece is assembled in a battery with a plurality of bipolar pole pieces, the insulating ring can better separate different electrode pole piece bodies, particularly, active electrode active material layers of adjacent electrode pole piece bodies are mutually contacted, and therefore the risk of electronic short circuit of the battery can be remarkably reduced.

The utility model provides a first aspect of a composite electrode plate, which comprises an electrode plate body and an insulating ring, wherein the insulating ring is arranged around the periphery of the electrode plate body; and/or arranging the insulating ring on the edge of at least one side surface of the electrode pole piece body.

This preset position of composite electrode pole piece is provided with the insulating ring, when the assembly of composite electrode pole piece has in the battery on a plurality of superimposed bipolar pole pieces and solid electrolyte layer, not only can separate different (especially adjacent) solid electrolyte layer direct contact effectively, avoid the battery to take place the phenomenon of ionic short circuit, insulating ring on the preset position can also completely cut off different (especially adjacent) electrode pole piece body direct contact more fully, thereby can show and reduce the risk that the electronic short circuit takes place for bipolar battery, improve bipolar battery's stability, be favorable to the full play of battery performance.

The utility model discloses the second aspect provides an electricity core, including a plurality of range upon range of settings the utility model discloses the combined electrode pole piece and solid-state electrolyte layer that the first aspect provided.

This electric core possess a plurality of series connection superimposed composite electrode pole pieces and solid electrolyte layer simultaneously to built-in composite electrode pole piece not only can separate different solid electrolyte layers, can also show the risk that reduces the electron short circuit that different electrode pole piece bodies contacted each other and caused, thereby this electric core can be used to provide structure, stable performance's bipolar battery.

The third aspect of the present invention provides a bipolar battery, which includes the electrical core provided by the second aspect of the present invention.

The bipolar battery has the advantages of higher voltage, higher energy density and higher overcurrent capacity, and has stable performance.

Drawings

Fig. 1 is a top view of a composite electrode sheet according to an embodiment of the present invention;

fig. 2 is a front view of a composite electrode sheet according to an embodiment of the present invention;

fig. 3 is a front view of a composite electrode sheet according to another embodiment of the present invention;

fig. 4 is a top view of an insulation ring disassembled from a composite electrode sheet according to another embodiment of the present invention;

fig. 5 is a top view of a composite electrode sheet according to another embodiment of the present invention;

fig. 6 is a cross-sectional view of a battery cell according to an embodiment of the present invention;

fig. 7 is a cross-sectional view of a battery cell provided by another embodiment of the present invention.

Description of the drawings: 10-a composite electrode sheet; 11-electrode sheet body; 111-positive electrode active material layer; 112-positive current collector; 113-a negative current collector; 114-a negative active material layer; 12-an insulating ring; 20-solid electrolyte layer.

Detailed Description

Please refer to fig. 1-5. The embodiment of the present invention provides a composite electrode plate 10, which includes an electrode plate body 11 and an insulating ring 12, wherein the insulating ring 12 is disposed on an edge of at least one side surface of the electrode plate body 11 (as shown in fig. 1-2); and/or an insulating ring 12 is disposed around the periphery of the electrode pad body 11 (as shown in fig. 3-5).

In the present invention, "the insulating ring 12 is disposed on the edge of at least one side surface of the electrode plate body 11" means that the insulating ring 12 is disposed on at least one surface of the two surfaces of the electrode plate body 11 perpendicular to the thickness direction thereof, and is disposed on the edge of the at least one surface; the phrase "the insulating ring 12 is provided around the periphery of the electrode tab body 11" means that the insulating ring 12 is provided on the outer peripheral wall of the electrode tab body 11 parallel to the thickness direction thereof.

In the present invention, the insulating ring 12 refers to an annular structure made of insulating material, and the inner and outer contours of the annular structure can be square, circular or other curved or polygonal shapes. The outer or inner contour of the insulating ring 12 needs to match the outer contour of the electrode pad body 11.

The utility model discloses in, above-mentioned electrode sheet body 11 is including the positive pole active material layer, the mass flow body and the negative pole active material layer of range upon range of setting. In some embodiments, the current collector may be formed of a single aluminum foil, and the aluminum foil may have positive and negative active material layers disposed on opposite surfaces thereof.

In other embodiments, the current collector is a composite current collector, the composite current collector includes a positive electrode current collector 112 (which may be an aluminum foil), an adhesive layer, and a negative electrode current collector 113 (which may be a copper foil) which are stacked, the positive electrode current collector 112 is disposed near the positive electrode active material layer 111 (as shown in fig. 2-3), and the adhesive layer includes a porous polymer film filled with a conductive adhesive. At this time, the positive part (including the positive active material layer 111 and the positive current collector 112, for convenience of description, the positive part is denoted as a) and the negative part (including the negative current collector 113 and the negative active material layer 114, for convenience of description, the negative part is denoted as B) of the electrode plate body 11 can be processed respectively, so as to avoid mutual influence of different solvents used by the positive and negative active material layers in the drying process, and more importantly, to determine rolling process parameters according to respective materials of the positive and negative active material layers, so as to avoid the phenomenon that when a single current collector is used, the rolling parameters are not in accordance with the characteristics of the active material on one side, and the active material particles are broken due to excessive pressure, or the loss of volume energy density due to small compaction density of the active material layer on one side due to insufficient pressure. In addition, the polymer film is small in mass and has certain structural strength, and the thickness of the positive current collector and the negative current collector can be reduced due to the polymer film, so that the total mass of the current collectors can be reduced, and the energy density of the battery can be improved.

In the utility model, the porosity of the porous polymer film is in the range of 40-70%, and the aperture is in the range of 0.1-20 mm. The thickness of the above porous polymer film is in the range of 1 μm to 10 μm. The porous polymer film may be an insulating polymer film, or may be a common polymer film, and is preferably an insulating polymer film. The utility model discloses in, above-mentioned insulating porous polymer membrane's electronic conductivity and ionic conductivity all are less than 10 ^-9 And (5) S/m. The material of the insulating porous polymer film includes, but is not limited to, polyetheretherketone, polyethylene terephthalate, polyimide, polyphenylene oxide.

When the porous polymer film is an insulating material, the transverse dimension of the porous insulating polymer film can be controlled to be larger than the transverse dimensions of the positive and negative electrode active material layers, the current collector and the solid electrolyte layer 20, so that when the porous insulating polymer film is assembled into a battery, the positive and negative electrode active material layers and the solid electrolyte layer 20 can be effectively prevented from contacting with each other, and the risk of short circuit in the bipolar battery can be further reduced. It should be noted that the portions of the porous insulating polymer films extending outside the positive and negative current collectors may not be filled with conductive paste.

In some embodiments, the insulating ring 12 may be disposed on one side of the electrode sheet body 11 or on the edge of the opposite side surfaces. That is, at least one side surface of the electrode plate body 11 includes a non-insulating region and an insulating region surrounding the non-insulating region, and the insulating region is provided with an insulating ring 12. For example, the insulating ring 12 may be disposed on a surface of the positive electrode active material layer, or a surface of the negative electrode active material layer, or the insulating ring 12 may be disposed on a region of the current collector surface not covered by the positive/negative electrode active material layers.

In the above case, when the composite electrode sheet 10 is assembled into the battery cell, in order to ensure that the composite electrode sheet 10 can be sufficiently attached to the solid electrolyte layer 20 and the battery can work well, the composite electrode sheet 10 or the corresponding region of the solid electrolyte layer 20 may be thinned. For example, when the insulating ring 12 is disposed on the surface of the positive electrode active material layer, the thickness of the insulating region of the positive electrode active material layer may be partially thinned such that the thickness of the positive electrode active material layer of the insulating region is thinner than the thickness of the non-insulating region, so that the upper surface of the insulating ring 12 may be flush with the upper surface of the positive electrode active material layer. For another example, when the insulating ring 12 is disposed in a region of the surface of the current collector that is not covered by the positive electrode active material layer 111 (see fig. 2), the region of the positive electrode active material layer 111 corresponding to the insulating ring 12 may be thinned, for example, the positive electrode active material layer in the region is thinned, so that the upper surface of the insulating ring 12 (the surface perpendicular to the thickness direction thereof and away from the current collector) is flush with the upper surface of the positive electrode active material layer 111.

The insulating ring 12 may be formed by directly coating an insulating material on the insulating region on the surface of the electrode tab body 11 to form a ring-shaped insulating film, or may be formed by adhering a molded ring-shaped insulating film on the insulating region on the surface of the electrode tab body 11. When the composite electrode plate is assembled in a bipolar battery, the insulating ring 12 mainly plays a role in isolating the mutual contact of different electrode plate bodies 11 (especially the electrode active material layers in the adjacent electrode plate bodies 11), so that the phenomenon of electronic short circuit of the battery can be well prevented.

In other embodiments of the present invention, the insulating ring 12 can also surround the periphery of the electrode plate body 11, and the insulating ring 12 itself constitutes an annular structure. At this moment, the insulating rings 12 are all used as the extension parts of the electrode pole piece bodies 11, when the composite electrode pole piece 10 is assembled in the bipolar battery, the insulating rings 12 can play a role in isolating the mutual contact of different solid electrolyte layers, and meanwhile, the risk of direct contact of the different electrode pole piece bodies 11 caused by process errors in the battery preparation process can be obviously reduced, so that the battery can be well prevented from generating electronic and ionic short circuits.

In this case, the insulating ring 12 may be adhesively fixed around the electrode tab body 11 by a dispensing method. The opposite side surfaces (surfaces perpendicular to the thickness direction thereof) of the insulating ring 12 may be continuously extended to any height position of the electrode tab body 11. For example, the insulating ring 12 may be disposed on the periphery of the current collector (a single aluminum foil current collector, or the composite current collector described above), where the thickness of the insulating ring 12 is less than or equal to the thickness of the current collector. For another example, the insulating ring 12 may be disposed only on the periphery of the positive electrode active material layer (or the positive electrode portion) (in this case, the edge of the positive electrode active material layer is flush with the edge of the current collector, and the insulating ring 12 does not fall on the current collector in an orthogonal projection parallel to the surface of the current collector). For another example, the insulating ring 12 may also be provided only on the periphery of the anode active material layer (or the anode portion). Furthermore, an insulating ring 12 can also be provided around the entire electrode sheet body 11.

In still other cases, the insulating ring 12 may be present on both the edge of one or both side surfaces of the electrode pole body and the periphery of the electrode pole piece body 11 (a combination of the two). At this time, the insulating ring 12 formed to include the two oppositely disposed faces and the side faces connecting the two oppositely disposed faces may be fitted around the periphery of the electrode sheet body 11; wherein, the relative two sides that set up of insulating ring 12 are used for setting up at electrode pole piece body 11 both sides surface edge, and insulating ring 12 connects the side of the relative two sides that set up is used for setting up at electrode pole piece body 11 periphery.

In some embodiments of the present invention, the area of the insulation region accounts for 1% -30% of the total area of the composite electrode sheet. Preferably, the area of the insulating region accounts for 2% -20% of the total area of the composite electrode pole piece. Illustratively, the area of the insulating region may account for 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 15%, 20%, 25%, 30%, etc. of the total area of the composite electrode sheet. The area of the insulating region is controlled within a certain proportion, which is beneficial to reducing the production cost.

In the present invention, the electronic conductivity and the ionic conductivity of the insulating ring 12 are both less than 10 ^-9 And (5) S/m. In some embodiments, the insulating ring is made of a material including, but not limited to, alumina, boehmite, silica, polyethylene, and polypropylene.

The embodiment of the utility model provides an electric core is still provided, contain above-mentioned composite electrode pole piece 10.

Specifically, referring to fig. 6-7, the battery cell provided by the present invention includes a plurality of stacked and alternately arranged composite electrode sheets 10 and solid electrolyte layers 20. Specifically, the battery cell simultaneously includes a plurality of composite electrode sheets 10 and a plurality of solid electrolyte layers 20, and the composite electrode sheets 10 and the solid electrolyte layers 20 are alternately arranged.

It should be noted that, in the illustration provided in the present invention, the battery cell, the composite electrode sheet 10 and the solid electrolyte layer 20 are all illustrated as rectangles. In fact, the shapes of the above components may be curved or other polygonal shapes, and the outer contours of the insulating ring 12, the electrode sheet body 11, the composite electrode sheet 10, and the solid electrolyte layer 20 need to match each other.

In some embodiments of the present invention, the surface of the electrode plate body 11 includes a first surface and a second surface oppositely disposed along the stacking direction, the insulating ring 12 is disposed on the first surface, and in the battery cell, the first surface and the second surface of different electrode plate bodies 11 are alternately disposed; wherein, the size of the area of the electrode pole piece body 11 not covered by the insulating ring 12 along the first direction is L ₁ A dimension in the second direction of L ₂ The dimension of the composite electrode sheet 10 along the first direction is L ₁ ' and a dimension in the second direction is L ₂ ', the dimension of the solid electrolyte layer 20 in the first direction is L ₃ A dimension in the second direction of L ₄ (ii) a The first direction is the length or width direction of the composite electrode sheet 10, and the second direction is perpendicular to the first directionIs in the first direction;

at this time, L ₁ ≤L ₃ ≤L ₁ ’，L ₂ ≤L ₄ ≤L ₂ ’。

L ₁ ≤L ₃ 、L ₂ ≤L ₄ The non-insulation area of the electrode plate body 11 is completely covered by the solid electrolyte layer 20, and the non-insulation area is prevented from being directly exposed, so that the phenomena that different (especially adjacent) electrode plate bodies 11 are contacted with each other and electronic short circuit occurs can be avoided. L is ₃ ≤L ₁ ’、L ₄ ≤L ₂ ' making the dimensions of the composite electrode sheet 10 greater than or equal to the dimensions of the solid electrolyte layers 20 ensures that the different (especially adjacent) solid electrolyte layers 20 can be sufficiently separated from each other without contacting each other, avoiding the occurrence of ion short-circuiting. Therefore, the composite electrode pole pieces 10 and the solid electrolyte layers 20 have mutually independent structures, and the battery core can be used for providing a bipolar battery with stable performance.

In other words, when the dimensions of the composite electrode sheet 10 and the solid electrolyte layer 20 satisfy the above requirements, the inside of the battery cell may not only be physically separated by the composite electrode sheet 10 itself, but also the presence of the insulating ring 12 can prevent the electrode active material layer (positive electrode active material layer and/or negative electrode active material layer) from being directly exposed, so as to better avoid the phenomenon of ion and electron short circuit of the battery.

The utility model discloses in, when insulating ring 12 only set up the side surface at electrode pole piece body 11 (with at positive pole active material layer surface, perhaps with at negative pole active material layer surface, perhaps with a side surface at the mass flow body as the setting shown in fig. 2, fig. 6), for the combined electrode pole piece 10 of abundant difference, can be so that in each combined electrode pole piece 10, insulating ring 12 all lies in the first face of electrode pole piece body 11 simultaneously. At this time, the surface of the electrode tab body 11 with the insulating ring 12 is a first surface, and the surface without the insulating ring 12 is a second surface. Illustratively, a cell includes 3 sets of composite electrode pole pieces 10 stacked one on another and a solid electrolyte layer 20 disposed between each composite electrode pole piece 10, where a is a first surface (a surface with an insulating ring 12) and b is a second surface (a surface without the insulating ring 12) of the 3 electrode pole piece bodies 11, and then the 3 electrode pole piece bodies 11 are arranged in ab, ab along the thickness direction of the cell.

The utility model discloses in, also can be that the relative both sides of each electrode sheet body 11 all are equipped with insulating ring 12 on the surface, no longer do the actual differentiation to the first face and the second face of electrode sheet body 11 this moment, each size all satisfy aforementioned relation can.

In some embodiments, the width of the insulating ring 12 is in a range greater than 0cm and less than or equal to 2cm. Preferably, the width of the insulation ring 12 is in the range of more than 0cm and less than or equal to 1cm. Illustratively, the width of the insulating ring 12 may be 0.1cm, 0.2cm, 0.3cm, 0.4cm, 0.5cm, 0.6cm, 0.7cm, 0.8cm, 0.9cm, 1.0cm, 1.2cm, 1.0cm, 1.5cm, 2.0cm, and the like. At this time, the width of the insulating ring 12 specifically refers to the distance from the outer contour of the non-insulating region of the electrode tab body 11 to the outer contour of the insulating ring 12. The width of each part of the insulating ring 12 may be equal or unequal, but the outer contour of the insulating ring 12 needs to match with the outer contour of the electrode sheet body 11. The width of the insulating ring 12 is controlled within the above range, so that a space is reserved for process errors possibly existing in the battery preparation process, the insulating ring 12 can play its fundamental role, the area ratio of a non-insulating area in the composite electrode pole piece 10 is increased as much as possible, and the production cost is reduced.

In some embodiments of the present invention, the insulating ring 12 is disposed around the periphery of the electrode plate body 11 (see fig. 4-5 and 7), and the dimension of the electrode plate body 11 along the first direction is L ₁ ", a dimension in the second direction is L ₂ ", two widths of the insulation ring 12 along the first direction are L respectively ₅ 、L ₅ ', two widths of the insulating ring 12 along the second direction are L respectively ₇ 、L ₇ ', the dimension of the solid electrolyte layer 20 in the first direction is L ₃ A dimension in the second direction of L ₄ (ii) a The first direction is the length or width direction of the electrode tab body 11 (also the length or width direction of the solid electrolyte layer 20), and the second direction is perpendicular to the electrode tab bodyThe first direction;

at this time, L ₁ ”≤L ₃ ≤L ₁ ”+L ₅ +L ₅ ’，L ₂ ”≤L ₄ ≤L ₂ ”+L ₇ +L ₇ '. In this case, the width of the insulating ring 12 specifically refers to the distance from the inner contour of the insulating ring 12 to the outer contour of the insulating ring 12 (as shown in fig. 4). L above ₇ 、L ₇ ’、L ₉ 、L ₉ The values of' may or may not be equal.

Similarly, L ₁ ”≤L ₃ ≤L ₁ ”+L ₅ +L ₅ ’，L ₂ ”≤L ₄ ≤L ₂ ”+L ₇ +L ₇ ' different solid electrolyte layers 20 and different composite electrode sheets 10 can be separated, and will not be described herein.

In some embodiments, the insulating ring 12 has an inner diameter L along the first direction ₆ The inner diameter of the insulating ring 12 along the second direction is L ₈ (see also FIG. 4), L ₁ ”≤L ₆ ≤1.1L ₁ ”，L ₂ ”≤L ₈ ≤1.1L ₂ "; preferably, L ₁ ”≤L ₆ ≤1.05L ₁ ”，L ₂ ”≤L ₈ ≤1.05L ₂ ". Control L ₁ ”≤L ₆ ≤1.1L ₁ ”，L ₂ ”≤L ₈ ≤1.1L ₂ The insulating ring 12 and the electrode pole piece body 11 form clearance fit, so that a certain adjusting space can be provided for process errors, and the size of the composite electrode pole piece 10 can be controlled within a proper range. When L is ₁ ”≤L ₆ ≤1.05L ₁ ”，L ₂ ”≤L ₈ ≤1.05L ₂ And the size of the composite electrode pole piece 10 is further controlled to be smaller, and the production cost is further reduced.

Furthermore, control L ₅ 、L ₅ ’、L ₇ 、L ₇ ' all in the range of more than 0cm and less than or equal to 2cm, preferably, each of the above values in the range of more than 0cm and less than or equal to 1cm, is also advantageous for reducing the size of the composite electrode sheet 10 from being too largeUnnecessary waste is caused, and the problem that the battery cell assembly is not facilitated due to the overlarge area of the outward extension of the insulating ring 12 is avoided. Exemplarily, L ₅ 、L ₅ ’、L ₇ 、L ₇ ' may be independently 0.1cm, 0.2cm, 0.3cm, 0.4cm, 0.5cm, 0.6cm, 0.7cm, 0.8cm, 0.9cm, 1.0cm, 1.2cm, 1.0cm, 1.5cm, 2.0cm, etc.

The utility model discloses in, still include two unipolar pole pieces (positive pole piece, negative pole piece) in the electric core, and above-mentioned a plurality of superimposed composite electrode pole pieces 10 and solid-state electrolyte layer 20 place between above-mentioned two unipolar pole pieces.

The utility model also provides a bipolar battery contains above-mentioned electric core. The bipolar battery has the advantages of higher voltage, higher energy density and higher overcurrent capacity, and the performance of the bipolar battery is stable.

The technical solution of the present invention will be described in detail with reference to the following embodiments.

Example 1

An electric core comprises a positive pole piece, 5 solid electrolyte layers, 4 composite pole pieces and a negative pole piece, wherein the 5 solid electrolyte layers are stacked and alternately arranged. The composite electrode pole piece comprises an electrode pole piece body and an insulating ring arranged on the first surface of the electrode pole piece body. Dimension L of the area of the positive electrode active material layer body not covered by the insulating ring along the first direction ₁ A dimension L of 8cm in the second direction ₂ Is 6cm, and the dimension L of the composite electrode pole piece along the first direction ₁ ' 10cm, dimension L in second direction ₂ ' 8cm, the dimension L of the solid electrolyte layer in the first direction ₃ A dimension L of 9cm along the second direction ₄ Is 7cm; the width of the insulating ring is 1cm everywhere. The first direction is a length or width direction of the positive active material layer body, and the second direction is perpendicular to the first direction.

Example 2

The differences from example 1 are: the insulating ring is arranged on the periphery of the electrode pole piece body. The length L of the electrode sheet body along the first direction ₁ "15 cm, width L in the second direction ₂ "is 10cm in length,two widths L of the insulating ring along the first direction ₅ 、L ₅ Both are 2cm, inner diameter L ₆ 15.2cm, two widths L of the insulating ring along the second direction ₇ 、L ₇ Both are 2cm, inner diameter L ₈ 10.1cm, a dimension L of the solid electrolyte layer in the first direction ₃ A dimension L of 17cm in the second direction ₄ Is 12cm. Wherein, the clearance between insulating ring and the electrode pole piece body has been filled up insulating cement.

The foregoing is illustrative of the present invention, and it should be noted that, for those skilled in the art, without departing from the principles of the present invention, several improvements and embellishments can be made thereto, and these improvements and embellishments are also considered as the protection scope of the present invention.

Claims (14)

1. The composite electrode plate is characterized in that the composite electrode plate (10) comprises an electrode plate body (11) and an insulating ring (12), wherein the insulating ring (12) is arranged around the periphery of the electrode plate body (11); and/or the insulating ring (12) is arranged on the edge of at least one side surface of the electrode pole piece body (11).

2. The composite electrode sheet (10) according to claim 1, wherein at least one side surface of the electrode sheet body (11) comprises a non-insulating region and an insulating region surrounding the non-insulating region, and the insulating region is provided with the insulating ring (12).

3. The composite electrode sheet (10) according to claim 1 or 2, wherein the electrode sheet body (11) comprises a positive electrode active material layer (111), a current collector and a negative electrode active material layer (114) which are arranged in a stacked manner; the current collector comprises a positive current collector (112), a bonding layer and a negative current collector (113) which are arranged in a stacked mode, the positive current collector (112) is arranged close to the positive active material layer (111), and the bonding layer comprises a porous polymer film filled with a conductive binder.

4. The composite electrode sheet according to claim 3, characterized in that the insulating ring (12) has a thickness less than or equal to the thickness of the electrode sheet body (11) when the insulating ring (12) is disposed around the periphery of the electrode sheet body (11).

5. The composite electrode sheet according to claim 3, characterized in that the insulating ring (12) has a thickness less than or equal to the thickness of the current collector.

6. A cell comprising a plurality of stacked and alternating solid electrolyte layers (20) and a composite electrode sheet (10) according to any one of claims 1 to 5.

7. The electric core of claim 6, wherein the surface of the electrode sheet body (11) comprises a first surface and a second surface which are oppositely arranged along the stacking direction, the insulating ring (12) is arranged on the first surface of the electrode sheet body (11), and the first surface and the second surface of different electrode sheet bodies (11) are alternately arranged in the electric core; wherein the size of the area of the electrode pole piece body (11) which is not covered by the insulating ring (12) along the first direction is L ₁ A dimension in the second direction is L ₂ The size of the composite electrode pole piece (10) along the first direction is L ₁ ' and a dimension in the second direction is L ₂ ', the dimension of the solid electrolyte layer (20) in the first direction is L ₃ A dimension in the second direction is L ₄ (ii) a The first direction is the length or width direction of the composite electrode pole piece (10), and the second direction is perpendicular to the first direction;

wherein L is ₁ ≤L ₃ ≤L ₁ ’，L ₂ ≤L ₄ ≤L ₂ ’。

8. The electrical core according to claim 7, wherein the insulating rings (12) each have a width in the range of greater than 0cm and less than or equal to 2cm.

9. The electrical core of claim 8, wherein the insulating rings (12) each have a width in the range of greater than 0cm and less than or equal to 1cm.

10. The electrical core of claim 6, wherein the insulating ring (12) is disposed around the periphery of the electrode sheet body (11), wherein the dimension of the electrode sheet body (11) along the first direction is L ₁ ", the dimension in the second direction is L ₂ ", two widths of the insulation ring (12) along the first direction are respectively L ₅ 、L ₅ ', two widths of the insulating ring (12) along the second direction are respectively L ₇ 、L ₇ ', the dimension of the solid electrolyte layer (20) in the first direction is L ₃ A dimension in the second direction of L ₄ (ii) a The first direction is the length or width direction of the electrode pole piece body (11), and the second direction is perpendicular to the first direction;

wherein L is ₁ ”≤L ₃ ≤L ₁ ”+L ₅ +L ₅ ’，L ₂ ”≤L ₄ ≤L ₂ ”+L ₇ +L ₇ ’。

11. The cell of claim 10, wherein the insulating ring (12) has an inner diameter L in the first direction ₆ The inner diameter of the insulating ring (12) along the second direction is L ₈ ，L ₁ ”≤L ₆ ≤1.1L ₁ ”，L ₂ ”≤L ₈ ≤1.1L ₂ "; said L ₅ 、L ₅ ’、L ₇ 、L ₇ ' are each in the range of greater than 0cm and less than or equal to 2cm.

12. The cell of claim 11, wherein L is L ₁ ”≤L ₆ ≤1.05L ₁ ”，L ₂ ”≤L ₈ ≤1.05L ₂ ”。

13. The method of claim 10Electrical core, characterized in that, L ₅ 、L ₅ ’、L ₇ 、L ₇ ' are each in the range of greater than 0cm and less than or equal to 1cm.

14. A bipolar battery comprising the cell of any of claims 6-13.

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