Preparation method of electrode assembly, battery monomer, battery, electric equipment and energy storage equipment

Abstract

The invention relates to the technical field of energy storage, in particular to a preparation method of an electrode assembly, a battery monomer, a battery, electric equipment and energy storage equipment. The preparation method comprises the following steps: respectively forming a cathode pole piece film roll and an anode pole piece film roll; cutting the cathode pole piece and the anode pole piece to obtain a plurality of cathode pole pieces and anode pole pieces with first sizes; the cathode pole pieces and the anode pole pieces are subjected to staggered stacking treatment through a lamination process to form a lamination structure; carrying out isostatic pressing treatment on the laminated structure; and the lamination structure subjected to isostatic pressing treatment is subjected to slitting treatment, an electrode assembly of a second size is obtained, and the second size is smaller than the first size. According to the preparation method, redundant pole pieces can be prevented from existing at the edge of the electrode assembly, so that the abnormality of cathode and anode lap joint short circuit caused by collapse and deformation of the edge of the electrode assembly due to isostatic pressing is solved, and the production yield of the electrode assembly is improved.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to a method for preparing an electrode assembly, a battery cell, a battery, an electrical device, and an energy storage device. Background Art

[0002] This section merely provides background information related to the present application and is not necessarily prior art.

[0003] Solid-state batteries have advantages such as high safety and high energy density. However, there are still many problems in the battery manufacturing process. Solid-state batteries require high pressure to press the cathode, electrolyte membrane, and anode due to high interface impedance. Isostatic pressing is suitable for the pressing process of solid-state batteries because of its uniform pressure and the advantage of ultra-high pressure pressing. Therefore, studying the isostatic pressing process of solid-state batteries is an important topic.

[0004] When stacking multiple layers of solid-state batteries, due to the inconsistent sizes of the cathode plates (positive plates) and anode plates (negative plates), generally the size of the anode plates is slightly larger than the size of the cathode plates. Therefore, there will be extra anode plates at the edge of the battery cells after stacking. During the isostatic pressing process, these extra plates are prone to collapse and deformation, causing the battery to short-circuit, thus easily causing battery failure. Summary of the invention

[0005] In view of the above problems, the present application provides a method for preparing an electrode assembly, a battery cell, a battery, an electrical device and an energy storage device. The preparation method can avoid the existence of redundant pole pieces at the edge of the electrode assembly, solve the abnormality of short circuit between the positive and negative electrodes caused by collapse and deformation of the edge of the electrode assembly due to isostatic pressing, and improve the production yield of the electrode assembly.

[0006] The first aspect of the present application proposes a method for preparing an electrode assembly, comprising: forming a cathode electrode sheet film roll and an anode electrode sheet film roll respectively; cutting the cathode electrode sheet film roll and the anode electrode sheet film roll to obtain a plurality of cathode electrode sheets and anode electrode sheets of a first size; stacking the cathode electrode sheets and the anode electrode sheets alternately through a lamination process to form a lamination structure; isostatically pressing the lamination structure; and cutting the isostatically pressed lamination structure to obtain the electrode assembly of a second size, wherein the second size is smaller than the first size.

[0007] In the technical solution of the embodiment of the present application, the size of the anode and cathode pole pieces are increased during stacking, and then the anode and cathode pole pieces after stacking are subjected to isostatic pressing. Finally, the excess material on the edges of the anode and cathode pole pieces after static pressing is cut off according to the required size, and the remaining parts can obtain the required electrode assembly. In this way, the existence of excess pole pieces at the edge of the electrode assembly can be avoided, thereby solving the abnormality of anode and cathode overlap short circuit caused by collapse and deformation of the edge of the electrode assembly due to isostatic pressing, thereby improving the production yield of the electrode assembly.

[0008] In certain embodiments, the first dimension includes a first length dimension L1 along a first direction and a first width dimension W1 along a second direction, the second dimension includes a second length dimension L2 along the first direction and a second width dimension W2 along the second direction, the first direction is the length direction of the electrode assembly, the second direction is the width direction of the electrode assembly, and the first direction is coplanar and intersects with the second direction; L1 is greater than or equal to 1.05 times of L2 and less than or equal to 1.2 times of L2; W1 is greater than or equal to 1.05 times of W2 and less than or equal to 1.2 times of W2.

[0009] In this embodiment, L1 is greater than or equal to 1.05 times of L2, which can avoid the length of the laminated structure after isostatic pressing being less than the second length dimension L2 due to dense shrinkage during the isostatic pressing process, and L1 is less than or equal to 1.2 times of L2 to reduce the length waste of the electrode assembly, W1 is greater than or equal to 1.05 times of W2, which can avoid the width of the laminated structure after isostatic pressing being less than the second width dimension W2 due to dense shrinkage during the isostatic pressing process, and W1 is less than or equal to 1.2 times of W2 to reduce the width waste of the electrode assembly.

[0010] In certain embodiments, the laminated structure after isostatic pressing is cut into pieces to obtain the electrode assembly of a second size, comprising: determining an outline of the electrode assembly in the laminated structure, wherein the outline is within the central range of the laminated structure and the shape of the outline corresponds to the shape of the laminated structure; and cutting the laminated structure according to the outline to obtain the electrode assembly.

[0011] In this embodiment, the contour of the electrode assembly is set in the central range of the laminate structure, which can ensure uniform cutting and the yield of the electrode assembly.

[0012] In some embodiments, the slitting process includes at least one of laser slitting, cutting knife slitting, die punching, blade back and forth cutting, or disc blade rotary cutting.

[0013] In this embodiment, by limiting the cutting method, the size of the electrode assembly after cutting can be ensured to be accurate, thereby improving the reliability of the electrode assembly.

[0014] In certain embodiments, a cathode electrode sheet film roll and an anode electrode sheet film roll are formed separately, including: providing a plurality of cathode substrates and anode substrates respectively; coating a cathode material on the cathode substrate and coating an anode material on the anode substrate, and coating an insulating material on at least one end of the cathode substrate and / or the anode substrate along a second direction; coating a solid electrolyte membrane on the cathode substrate and / or the anode substrate to form the cathode electrode sheet film roll and the anode electrode sheet film roll.

[0015] In this embodiment, by coating cathode material on the cathode substrate and anode material on the anode substrate, the content of active material in the electrode assembly can be increased, thereby improving the energy density of the battery. Insulating material is coated on at least one end of the cathode substrate and / or the anode substrate in the first direction to enhance the insulation effect between the anode electrode sheet and the cathode electrode sheet and reduce the risk of overlap between the anode electrode sheet and the cathode electrode sheet. A solid electrolyte membrane is coated on the cathode substrate or the anode substrate, so that an ion channel can be formed between the anode electrode sheet and the cathode electrode sheet through the solid electrolyte membrane to ensure the transfer and reaction of positive and negative ions.

[0016] In certain embodiments, the cathode substrate includes a cathode current collecting portion and a cathode tab protruding from the cathode current collecting portion along the second direction, the anode substrate includes an anode current collecting portion and an anode tab protruding from the anode current collecting portion along the second direction, a cathode material is coated on the cathode substrate and an anode material is coated on the anode substrate, and an insulating material is coated on at least one end of the cathode substrate and / or the anode substrate along the second direction, including: coating the insulating material on the connection area between the cathode current collecting portion and the cathode tab and / or the connection area between the anode current collecting portion and the anode tab to form an insulating layer; coating the cathode material on the cathode current collecting portion to form a cathode active material layer, and coating the anode material on the anode current collecting portion to form an anode active material layer.

[0017] In this embodiment, by coating the connection area between the cathode current collecting part and the cathode tab and / or the connection area between the anode current collecting part and the anode tab with an insulating material to form an insulating layer, a short circuit between the anode tab and the cathode tab can be avoided, the risk of battery short circuit is reduced, and the safety of the battery is improved.

[0018] In some embodiments, along the second direction, the size of the insulating layer in the cathode tab is greater than or equal to the thickness of the anode tab, and less than or equal to 0.5 times the cathode tab; along the second direction, the size of the insulating layer in the anode tab is greater than or equal to the thickness of the cathode tab, and less than or equal to 0.5 times the anode tab.

[0019] In this embodiment, along the second direction, the size of the insulating layer in the cathode pole ear is greater than or equal to the thickness of the anode pole piece, which can insulate and separate the cathode pole ear and the anode pole ear, reduce the risk of short circuit of the electrode assembly, and improve the reliability of the electrode assembly. The size of the insulating layer in the cathode pole ear is less than or equal to 0.5 times the size of the anode pole piece, which can avoid the insulating layer occupying the welding position of the cathode pole ear, ensuring the reliability of the cathode pole piece during welding. Along the second direction, the size of the insulating layer in the anode pole ear is greater than or equal to the thickness of the cathode pole piece, which can insulate and separate the cathode pole ear and the anode pole ear, reduce the risk of short circuit of the electrode assembly, and improve the reliability of the electrode assembly. The size of the insulating layer in the anode pole ear is less than or equal to 0.5 times the size of the cathode pole piece, which can avoid the insulating layer in the anode pole ear occupying the welding position of the anode pole ear, ensuring the reliability of the anode pole piece during welding.

[0020] In certain embodiments, the cathode substrate and the anode substrate include at least one of a copper substrate, an aluminum substrate, a stainless steel substrate, an alloy substrate, or a composite substrate.

[0021] In this embodiment, by limiting the materials of the cathode substrate and the anode substrate, an anode electrode sheet and a cathode electrode sheet can be formed.

[0022] In some embodiments, the coating method may include one of extrusion coating or transfer coating.

[0023] In this embodiment, by limiting the coating method, it can be ensured that the cathode material, the anode material, the insulating material, etc. can be firmly attached to the cathode current collecting part of the cathode substrate and the anode current collecting part of the anode substrate, respectively.

[0024] In some embodiments, the solid electrolyte membrane is at least one of a sulfide electrolyte membrane, an oxide electrolyte membrane, or a halide electrolyte membrane.

[0025] In this embodiment, by limiting the solid electrolyte membrane, an ion channel is formed between the cathode electrode piece and the anode electrode piece to ensure the transfer and reaction of positive and negative ions.

[0026] A second aspect of the present application provides a battery cell, comprising an electrode assembly prepared by the preparation method described in the above embodiment.

[0027] The battery cell according to the present application has the same beneficial effects as the electrode assembly obtained by the preparation method proposed in any embodiment of the present application.

[0028] A third aspect of the present application provides a battery, comprising the battery cell of the present application.

[0029] The battery according to the present application has the same beneficial effects as the battery cell proposed in any embodiment of the present application.

[0030] The fourth aspect of the present application proposes an electrical device, comprising the battery described above, wherein the battery is used to store or provide electricity.

[0031] The electrical equipment according to the present application has the same beneficial effects as the battery proposed in the present application or any embodiment of the present application.

[0032] The fifth aspect of the present application proposes an energy storage device, comprising the battery described in the present application, wherein the battery is used to store or provide electrical energy.

[0033] The energy storage device according to the present application has the same beneficial effects as the battery proposed in the present application or any embodiment of the present application.

[0034] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings: Figure 1 A schematic diagram of the structure of a vehicle according to some embodiments of the present application; Figure 2 A schematic diagram of the three-dimensional structure of an electrode assembly according to some embodiments of the present application; Figure 3 One of the flow charts of the method for preparing an electrode assembly according to some embodiments of the present application; Figure 4 A schematic diagram of a method for preparing an electrode assembly according to some embodiments of the present application; Figure 5 A schematic diagram of a cathode electrode of some embodiments of the present application; Figure 6 Schematic diagram of anode plates of some embodiments of the present application; Figure 7 A schematic diagram of an electrode assembly according to some embodiments of the present application; Figure 8 This is a second flow chart of a method for preparing an electrode assembly according to some embodiments of the present application; Fig. 9 A schematic diagram of a cathode substrate according to some embodiments of the present application; Fig.10 A schematic diagram of a cathode electrode film roll according to some embodiments of the present application; Fig.11 A schematic diagram of an anode substrate according to some embodiments of the present application; Fig.12 A schematic diagram of an anode electrode film roll according to some embodiments of the present application; Fig.13 Flow chart 3 of the method for preparing an electrode assembly according to some embodiments of the present application; Fig.14 This is a fourth flow chart of a method for preparing an electrode assembly according to some embodiments of the present application.

[0036] Figure Number: 1000-vehicle, 100-battery, 200-controller, 300-motor, 10-electrode assembly, 11-cathode pole piece, 111-cathode substrate, 1111-cathode current collecting part, 1112-cathode pole ear, 112-cathode active material layer, 12-anode pole piece, 121-anode substrate, 1211-anode current collecting part, 1212-anode pole ear, 122-anode active material layer, 13-insulating layer. DETAILED DESCRIPTION

[0037] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0038] If not otherwise specified, all embodiments and optional embodiments of the present application can be combined with each other to form a new technical solution.

[0039] Unless otherwise specified, all technical features and optional technical features of this application can be combined with each other to form a new technical solution.

[0040] If there is no special explanation, all steps of the present application can be performed sequentially or randomly, preferably sequentially. For example, the method includes steps (a) and (b), which means that the method may include steps (a) and (b) performed sequentially, or may include steps (b) and (a) performed sequentially. For example, it is mentioned that the method may also include step (c), which means that step (c) can be added to the method in any order. For example, the method may include steps (a), (b) and (c), or may include steps (a), (c) and (b), or may include steps (c), (a) and (b), etc.

[0041] With the vigorous development of new energy, the demand for batteries as energy sources in various industries is increasing, and the demand for batteries with higher energy density, better cycle characteristics and higher safety characteristics is increasing sharply. Solid-state batteries have the advantages of high safety and high energy density, so the development of solid-state batteries has received more and more attention.

[0042] On the one hand, the electrode assembly in the solid-state battery is mainly formed by lamination or winding. In order to ensure that lithium deposition does not occur during the battery charging and discharging process, the lamination or winding process needs to ensure that the edge of the cathode electrode does not exceed the edge of the anode electrode. To achieve this goal, the Overhang area (OH area) needs to be controlled during lamination or winding. The OH area refers to the part of the anode electrode that exceeds the cathode electrode in the length and width directions, that is, the edge of the anode electrode is controlled to exceed the cathode by 0.2~4mm.

[0043] On the other hand, since solid-state batteries do not contain liquid electrolyte to infiltrate the pole pieces, and the pole pieces in the electrode assembly are solid-solid contact interfaces, the contact effect cannot achieve complete contact, which affects the final electrical performance of the battery. Therefore, during the production of solid-state batteries, it is necessary to apply a large pressure to the electrode assembly to achieve solid-solid interface bonding. The industry currently mainly uses isostatic pressing to apply this large pressure. It can be understood by those skilled in the art that isostatic pressing is to place the object to be processed in a closed container filled with liquid, gradually pressurize it through a booster system, and apply equal pressure to each surface of the object, so that the distance between molecules is reduced and the density is increased without changing the appearance shape, thereby improving the physical properties of the substance. Therefore, in isostatic pressing production, the pole piece in the OH region will collapse and deform due to high pressure, resulting in overlapping short circuits, which can easily cause the risk of failure of the electrode assembly and reduce the production yield of the battery.

[0044] Based on the above considerations, an embodiment of the present application provides a method for preparing an electrode assembly, by increasing the size of the anode and cathode pole sheets during stacking, and then performing isostatic pressing on the anode and cathode pole sheets after stacking, and finally cutting off the excess material on the edges of the anode and cathode pole sheets after the static pressing treatment according to the required size, and the remaining part can obtain the required electrode assembly. In this way, the presence of excess pole sheets at the edge of the electrode assembly can be avoided, thereby solving the abnormality of anode and cathode overlap short circuit caused by collapse and deformation of the edge of the electrode assembly due to isostatic pressing, thereby improving the production yield of the electrode assembly.

[0045] The manufacturing method of the electrode assembly disclosed in the embodiment of the present application can be used to manufacture the electrode assembly in the battery, and the battery can be used in, but not limited to, electrical equipment such as vehicles, ships or aircraft. The power supply system of the electrical equipment can be composed of the battery disclosed in the present application, which is conducive to improving the stability of the battery.

[0046] The embodiment of the present application provides an electric device using a battery as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0047] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device in an embodiment of the present application.

[0048] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle provided for some embodiments of the present application. Vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000, for example, the battery 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0049] In some embodiments of the present application, the battery 100 can be used not only as an operating power source for the vehicle 1000, but also as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000. The battery can include but is not limited to a solid-state battery, and the structure of the battery is described below using a solid-state battery as an example.

[0050] Please refer to Figure 2 , Figure 2 Schematic diagram of the structure of the electrode assembly 10 in the solid-state battery of some embodiments of the present application.

[0051] The electrode assembly 10 includes a cathode electrode piece, an anode electrode piece and a solid electrolyte membrane. The solid electrolyte membrane is located between the cathode electrode piece and the anode electrode piece, and is used to form an ion channel between the cathode electrode piece and the anode electrode piece to ensure the transfer and reaction of positive and negative ions. The material of the solid electrolyte may include oxides, phosphates, silicates, nitrides or sulfides. The cathode electrode piece, the anode electrode piece and the solid electrolyte layer located between the cathode electrode piece and the anode electrode piece are stacked to form a solid-state battery. Figure 21 shows the structure of the electrode assembly 10 formed by stacking the cathode electrode piece, the anode electrode piece and the solid electrolyte. The cathode electrode piece and the anode electrode piece with active material constitute the main body of the electrode assembly 10, and the cathode electrode piece and the anode electrode piece without active material constitute the tabs. The tabs can be located at one end of the main body or at both ends of the main body. The shape of the electrode assembly 10 can be rectangular, cylindrical, etc.

[0052] refer to Figures 3 to 14 , Figure 3 One of the flow charts of the method for preparing an electrode assembly according to some embodiments of the present application; Figure 4 This is one of the schematic diagrams of the method for preparing an electrode assembly according to some embodiments of the present application; Figure 5 Schematic diagram of the cathode electrode 11 in some embodiments of the present application; Figure 6 Schematic diagram of the anode electrode 12 in some embodiments of the present application; Figure 7 Schematic diagram of an electrode assembly 10 according to some embodiments of the present application; Figure 8 This is a second flow chart of a method for preparing an electrode assembly according to some embodiments of the present application; Fig. 9 A schematic diagram of a cathode substrate 111 according to some embodiments of the present application; Fig.10 A schematic diagram of a cathode electrode film roll according to some embodiments of the present application; Fig.11 Schematic diagram of an anode substrate 121 according to some embodiments of the present application; Fig.12 A schematic diagram of an anode electrode film roll according to some embodiments of the present application; Fig.13 Flow chart 3 of the method for preparing an electrode assembly according to some embodiments of the present application; Fig.14 This is a fourth flow chart of a method for preparing an electrode assembly according to some embodiments of the present application.

[0053] See also Figure 3 and Figure 4 The present application embodiment provides a method for preparing an electrode assembly 10, the method comprising the steps of: 01, forming a cathode electrode film roll and an anode electrode film roll respectively; 02, cutting the cathode electrode sheet film roll and the anode electrode sheet film roll to obtain a plurality of cathode electrode sheets 11 and anode electrode sheets 12 of a first size; 03, the cathode electrode sheet 11 and the anode electrode sheet 12 are alternately stacked by a lamination process to form a lamination structure; 04. Static pressing treatment of laminated structure; 05. Cut the laminated structure after isostatic pressing to obtain an electrode assembly 10 of a second size, where the second size is smaller than the first size.

[0054] In the preparation method of the electrode assembly 10 of the present application, by increasing the size of the positive and negative pole pieces 12 during lamination, and then isostatically pressing the positive and negative pole pieces 12 after lamination, and finally cutting off the excess material on the edges of the positive and negative pole pieces 12 after static pressing according to the required size, the remaining part can obtain the required electrode assembly 10. Since the positive and negative pole pieces 12 are tightly adhered together during cutting, it can be ensured that the electrode assembly 10 will not collapse and deform at the edge of the pole piece due to the high pressure of isostatic pressing, thereby causing the positive and negative poles of the battery cell to overlap and short-circuit. In this way, it is possible to avoid the existence of excess pole pieces at the edge of the electrode assembly 10, that is, to achieve the 0OH area, thereby solving the abnormality of the positive and negative poles overlapping and short-circuiting due to the collapse and deformation of the edge of the electrode assembly 10 caused by isostatic pressing, and improving the production yield of the electrode assembly 10.

[0055] It should be noted that the electrode assembly 10 can be applied to a solid-state battery, or in other words, the solid-state battery includes the above-mentioned electrode assembly 10. The cathode electrode film roll and the anode electrode film roll can be one piece or multiple pieces, each cathode electrode film roll can include multiple cathode electrode sheets 11, and each anode electrode film roll can include multiple anode electrode sheets 12.

[0056] It should also be noted that the second size is the design size of the electrode assembly 10, that is, the second size is the size of the electrode assembly 10 in the actual solid-state battery product. Both the first size and the second size include a length dimension along the first direction and a width dimension along the second direction. The length direction of the electrode assembly 10 coincides with the length direction of the anode electrode sheet 12 and the cathode electrode sheet 11, and the width direction of the electrode assembly 10 coincides with the width direction of the cathode electrode sheet 11 and the anode electrode sheet 12. The first direction may be the length direction of the electrode assembly 10, and the second direction is the width direction of the electrode assembly 10. Therefore, the length of the cathode electrode sheet 11 and the anode electrode sheet 12 in the laminated structure is greater than the length of the cathode electrode sheet 11 and the anode electrode sheet 12 in the electrode assembly 10. The width of the cathode electrode sheet 11 and the anode electrode sheet 12 in the laminated structure is greater than the width of the cathode electrode sheet 11 and the anode electrode sheet 12 in the electrode assembly 10. It can be understood that during the isostatic pressing process, the electrode sheet will be densely shrunk due to the high pressure. The size after isostatic pressing will be smaller than the size before isostatic pressing. Therefore, the second size is set smaller than the first size, that is, the size of the cathode electrode piece 11 and the anode electrode piece 12 in the stacked structure is set larger than the size of the cathode electrode piece 11 and the anode electrode piece 12 in the electrode assembly 10. This can ensure that the size of the electrode assembly 10 obtained after isostatic pressing meets the design requirements. In this way, the problem of large size fluctuation of the electrode assembly 10 after isostatic pressing is solved, and the product yield of the electrode assembly 10 is further improved.

[0057] The cutting process may include but is not limited to at least one of laser cutting, cutting with a cutting knife, die cutting, back and forth cutting with a blade, or rotary cutting with a disc blade. For example, in step 02, the cathode electrode sheet film roll and the anode electrode sheet film roll may be cut by die cutting to obtain the cathode electrode sheet 11 and the anode electrode sheet 12 of the first size. Of course, those skilled in the art may also select other suitable cutting processes for cutting according to actual needs, which will not be described in detail here.

[0058] A solid electrolyte film layer may be attached to the cathode electrode piece 11 or the anode electrode piece 12, or in other words, in the present application, the cathode electrode piece 11 or the anode electrode piece 12 includes a solid electrolyte film layer. During the lamination process, the solid electrolyte film layer needs to be located between the anode electrode piece 12 and the cathode electrode piece 11, that is, the solid electrolyte film layer abuts against the anode electrode piece 12 and the cathode electrode piece 11, respectively. The solid electrolyte film layer is used to form an ion channel between the cathode electrode piece 11 and the anode electrode piece 12 to ensure the transfer and reaction of positive and negative ions.

[0059] In step 04, the pressure of the isostatic pressing treatment may be 300-700 MPa, and the treatment time may be 1-30 min.

[0060] In step 05, the slitting method of the slitting process includes at least one of laser slitting, cutting knife slitting, die punching, blade back and forth cutting or disc blade rotary cutting. For example, in some examples, in step 05, the excess parts of the edges of the stacking structure can be stamped and cut off by the die, so as to ensure that the size of the cathode electrode piece 11 and the anode electrode piece 12 in the electrode assembly 10 are consistent. It can be understood that since the cathode electrode piece 11 and the anode electrode piece 12 are tightly adhered to one body during slitting, it can be ensured that the electrode assembly 10 will not collapse and deform due to the high pressure of isostatic pressing, thereby causing the phenomenon of overlapping and short-circuiting of the positive and negative electrodes of the battery cell. In addition, since the cathode electrode piece 11 and the anode electrode piece 12 in the electrode assembly 10 are the same size, the edge of the cathode electrode piece 11 does not exceed the edge of the anode electrode piece 12, so the lithium precipitation phenomenon of the electrode assembly 10 during the charging and discharging process can be avoided, thereby improving the production yield of the electrode assembly 10. In this way, by limiting the slitting method, the size of the electrode assembly 10 after slitting can be guaranteed to be accurate, and the reliability of the electrode assembly 10 can be improved.

[0061] See also Figure 5-7 In some embodiments, the first dimension includes a first length dimension L1 along the first direction and a first width dimension W1 along the second direction, the second dimension includes a second length dimension L2 along the first direction and a second width dimension W2 along the second direction, and the first direction intersects the second direction; L1 is greater than or equal to 1.05 times L2 and less than or equal to 1.2 times L2; ​​W1 is greater than or equal to 1.05 times W2 and less than or equal to 1.2 times W2.

[0062] For example, L1=1.05*L2, 1.06*L2, 1.08*L2, 1.1*L2, 1.12*L2, 1.015*L2, 1.18*L2, 1.2*L2, etc. W1=1.05*W2, 1.06*W2, 1.08*W2, 1.1*W2, 1.12*W2, 1.015*W2, 1.18*W2, 1.2*W2, etc.

[0063] In this embodiment, L1 is greater than or equal to 1.05 times of L2, which can avoid the length of the laminated structure after isostatic pressing being less than the second length dimension L2 due to the dense shrinkage of the laminated structure during the isostatic pressing process, and L1 is less than or equal to 1.2 times of L2 to reduce the waste of the electrode assembly 10 in the length direction, and W1 is greater than or equal to 1.05 times of W2 to avoid the width of the laminated structure after isostatic pressing being less than the second width dimension W2 due to the dense shrinkage of the laminated structure during the isostatic pressing process, and W1 is less than or equal to 1.2 times of W2 to reduce the waste of the electrode assembly 10 in the width direction.

[0064] See also Figure 8-12 In some embodiments, step 01 includes: 011, providing a plurality of cathode substrates 111 and anode substrates 121 respectively; 012, coating a cathode material on the cathode substrate 111 and coating an anode material on the anode substrate 121, and coating an insulating material on at least one end of the cathode substrate 111 and / or the anode substrate 121 along the second direction; 013. A solid electrolyte membrane is coated on the cathode substrate 111 or the anode substrate 121 to form a cathode electrode sheet membrane roll and an anode electrode sheet membrane roll.

[0065] In this embodiment, by coating cathode material on the cathode substrate 111 and coating anode material on the anode substrate 121, the content of active material in the electrode assembly 10 can be increased, thereby improving the energy density of the battery. In the first direction, an insulating material is coated on at least one end of the cathode substrate 111 and / or the anode substrate 121 to enhance the insulation effect between the anode electrode sheet 12 and the cathode electrode sheet 11 and reduce the risk of overlap between the anode electrode sheet 12 and the cathode electrode sheet 11. A solid electrolyte membrane is coated on the cathode substrate 111 or the anode substrate 121, so that an ion channel can be formed between the anode electrode sheet 12 and the cathode electrode sheet 11 through the solid electrolyte membrane to ensure the transfer and reaction of positive and negative ions.

[0066] It should be noted that the cathode substrate 111 and the anode substrate 121 can be conductive materials, and the materials used for the cathode material and the anode substrate 121 can be the same or different. The cathode substrate 111 and the anode substrate 121 may include but are not limited to metals or conductive semiconductor materials, etc. For example, the cathode substrate 111 and the anode substrate 121 include at least one of a copper substrate, an aluminum substrate, a stainless steel substrate, an alloy substrate or a composite substrate. For example, in some examples, the cathode material and the anode substrate 121 are both made of a copper substrate. For example, in some examples, the cathode material is made of a copper substrate and the anode substrate 121 is made of an aluminum substrate. Of course, those skilled in the art can also choose other suitable materials as anode materials according to actual needs, which will not be repeated here. In this way, by limiting the materials of the cathode substrate 111 and the anode substrate 121, the anode pole piece 12 and the cathode pole piece 11 can be formed.

[0067] The anode material can be any one or more of natural graphite, artificial graphite, micron silicon, nano silicon, silicon oxide, silicon monoxide, silicon-carbon mixture, lithium foil, lithium-indium composite sheet, and lithium titanate. Of course, those skilled in the art can also select other suitable materials as anode materials according to actual needs, which will not be repeated here.

[0068] The cathode material may include any one or more of cobalt oxide material, nickel-cobalt-manganese ternary material, nickel-cobalt-aluminum ternary material, lithium iron phosphate material, lithium iron manganese phosphate material, and lithium manganese oxide, which will help improve the synergistic effect between the anode electrode 12, the cathode electrode 11 and the solid electrolyte membrane, and thus improve the electrical performance of the battery. Of course, those skilled in the art can also choose other suitable materials as active negative electrode materials according to actual needs, which will not be repeated here.

[0069] The solid electrolyte membrane is at least one of a sulfide electrolyte membrane, an oxide electrolyte membrane or a halide electrolyte membrane. Preferably, the sulfide system electrolyte membrane is selected from any one or more of LiPSCl, LiPS, LiPSBr, LiPSI, and LiGeSCl, and preferably, the halide system electrolyte membrane is selected from any one or more of LiInCl, LiYCl, LiZrCl, LiTaCl, and LiLaTaCl, so as to help improve the electrical performance of the battery. Of course, those skilled in the art can also select other suitable materials as solid electrolyte membranes according to actual needs, which will not be repeated here. In this way, by limiting the solid electrolyte membrane, an ion channel is formed between the cathode electrode sheet 11 and the anode electrode sheet 12 to ensure the transfer and reaction of positive and negative ions.

[0070] In step 012, when the cathode material is coated on the cathode substrate 111, the cathode material may be coated on one of the surfaces of the cathode substrate 111. Alternatively, the cathode material may be coated on two opposite surfaces of the cathode substrate 111. Similarly, when the anode material is coated on the anode substrate 121, the anode material may be coated on one of the surfaces of the anode substrate 121. Alternatively, the anode material may be coated on two opposite surfaces of the anode substrate 121. When the insulating material is coated, the insulating material may be coated only on the anode substrate 121, or only on the cathode substrate 111, or on both the anode substrate 121 and the cathode substrate 111. When the insulating material is coated on the anode substrate 121 or on the cathode substrate 111, it is necessary to coat the insulating material on the two opposite surfaces of the cathode substrate 111 or the anode substrate 121. When the insulating material is coated on both the anode substrate 121 and the cathode substrate 111, it may be coated on one of the surfaces of the anode substrate 121 and one of the surfaces of the cathode substrate 111. It can also be coated on two opposite surfaces of the anode substrate 121 and two opposite surfaces of the cathode substrate 111. When coating the insulating material, it can be coated only on the cathode substrate 111, only on the anode substrate 121, or on both the cathode substrate 111 and the anode substrate 121.

[0071] In step 013, when the solid electrolyte membrane is coated on the cathode substrate 111, the solid electrolyte membrane is coated on the area of ​​the cathode substrate 111 coated with the cathode material, and when the solid electrolyte membrane is coated on the anode substrate 121, the solid electrolyte membrane is coated on the area of ​​the anode substrate 121 coated with the anode material. In this way, the cathode electrode sheet film roll or the anode electrode sheet film roll contains a solid electrolyte membrane, so that the cathode electrode sheet 11 or the anode electrode sheet 12 can conduct ions through the solid electrolyte membrane, thereby promoting the transmission of charges. The solid electrolyte membrane can be formed on the anode electrode sheet 12 or the cathode electrode sheet 11 by coating, and the solid electrolyte membrane is formed after the slurry solidifies; or the solid electrolyte membrane can be bonded to the anode electrode sheet 12 or the cathode electrode sheet 11.

[0072] In some embodiments, the coating method may include extrusion coating or transfer coating. In this embodiment, by limiting the coating method, it can be ensured that the cathode material, the anode material, the insulating material, etc. can be firmly attached to the cathode current collecting part 1111 of the cathode substrate 111 and the anode current collecting part 1211 of the anode substrate 121.

[0073] For example, in some examples, the cathode material may be coated on the cathode substrate 111 by extrusion coating. Specifically, a coating mechanism may be used to coat the cathode material slurry on the surface of the cathode substrate 111, and the cathode material slurry may be dried to form an initial cathode active material layer 112, and then the initial cathode active material layer 112 may be extruded to form the cathode active material layer 112. It can be understood that the process of coating the anode material and the insulating material by extrusion coating may be the same as the process of coating the cathode material, and will not be described in detail herein.

[0074] See also Fig. 9 and Fig.11 In some embodiments, the cathode substrate 111 includes a cathode current collecting portion 1111 and a cathode tab 1112 protruding from the cathode current collecting portion 1111 along a second direction, and the anode substrate 121 includes an anode current collecting portion 1211 and an anode tab 1212 protruding from the anode current collecting portion 1211 along a second direction. The second direction may be the width direction of the cathode substrate 111 or the anode substrate 121. Fig.10 , Fig.12 and Fig.13 , step 012 comprises: 0121, coating an insulating material on a connection area between the cathode current collecting portion 1111 and the cathode tab 1112 and / or a connection area between the anode current collecting portion and the anode tab 1212 to form an insulating layer 13; 0122 , a cathode material is applied to the cathode current collecting portion 1111 to form a cathode active material layer 112 , and an anode material is applied to the anode current collecting portion 1211 to form an anode active material layer 122 .

[0075] In this embodiment, an insulating material is applied to the connection area between the cathode current collecting portion 1111 and the cathode pole tab 1112 and / or the connection area between the anode current collecting portion and the anode pole tab 1212 to form an insulating layer 13. This can prevent the anode pole tab 1212 from short-circuiting the cathode pole tab 1112, reduce the risk of battery short circuit, and improve battery safety.

[0076] Specifically, it should be noted that steps 0121 and 0122 may be executed simultaneously or sequentially. For example, step 0121 may be executed first and then step 0122, or step 0122 may be executed first and then step 0121. In other words, the execution order of steps 0121 and 0122 is not limited.

[0077] In the cathode substrate 111, the cathode tab 1112 may be located only on one side of the cathode current collecting portion 1111, or on two opposite sides of the cathode current collecting portion 1111. Similarly, in the anode substrate 121, the anode tab 1212 may be located only on one side of the cathode current collecting portion 1111, or on two opposite sides of the cathode current collecting portion 1111. As shown in the figure, in forming the cathode electrode sheet film roll, one side of the cathode current collecting portion 1111 may be connected to a plurality of cathode tabs 1112 arranged at intervals, and in forming the anode electrode sheet film roll, one side of the anode current collecting portion 1211 may be connected to a plurality of anode tabs 1212 arranged at intervals. In the cathode electrode sheet 11 and the anode electrode sheet 12 of the first size formed by shearing the cathode electrode sheet film roll and the anode electrode sheet film roll, one side of the cathode current collecting portion 1111 along the second direction may be connected to or have only one cathode tab 1112, and one side of the anode current collecting portion 1211 along the second direction may have only one anode tab 1212. In the case where the anode electrode sheet 12 and the cathode electrode sheet 11 have only one electrode tab, they can be stacked to form a stacked structure.

[0078] In some embodiments, along the second direction, the size of the insulating layer 13 in the cathode tab 1112 is greater than or equal to the thickness of the anode tab 12, and less than or equal to 0.5 times the cathode tab 1112; along the second direction, the size of the insulating layer 13 in the anode tab 1212 is greater than or equal to the thickness of the cathode tab 11, and less than or equal to 0.5 times the anode tab 1212.

[0079] In this embodiment, along the second direction, the size of the insulating layer 13 in the cathode ear 1112 is greater than or equal to the thickness of the anode electrode sheet 12, which can insulate and separate the cathode ear 1112 and the anode ear 1212, thereby reducing the risk of short circuit of the electrode assembly 10 and improving the reliability of the electrode assembly 10. The size of the insulating layer 13 in the cathode ear 1112 is less than or equal to 0.5 times the size of the anode electrode sheet 12, which can avoid the insulating layer 13 occupying the welding position of the cathode ear 1112 and ensure the reliability of the cathode electrode sheet 11 during welding. Along the second direction, the size of the insulating layer 13 in the anode ear is greater than or equal to the thickness of the cathode electrode sheet 11, which can insulate and separate the cathode ear 1112 and the anode ear 1212, thereby reducing the risk of short circuit of the electrode assembly 10 and improving the reliability of the electrode assembly 10. The size of the insulating layer 13 in the anode tab 1212 is less than or equal to 0.5 times the size of the cathode electrode piece 11 , which can prevent the insulating layer 13 in the anode tab 1212 from occupying the welding position of the anode tab 1212 and ensure the reliability of the anode electrode piece 12 during welding.

[0080] See also Fig.14 In some embodiments, step 05 includes: 051, determining the contour of the electrode assembly 10 in the laminate structure, the contour is in the central range of the laminate structure, and the shape of the contour corresponds to the shape of the laminate structure; 052, the laminated structure is cut according to the contour to obtain the electrode assembly 10.

[0081] In this embodiment, the contour of the electrode assembly 10 is set in the central range of the laminate structure, which can ensure uniform slitting and ensure the yield of the electrode assembly 10. By controlling the size of the electrode sheet before isostatic pressing, the final size of the battery cell is ensured to meet the specified design, thereby solving the problem of being unable to locate production in the later process due to the change in the size of the bare battery cell.

[0082] in, Figure 6 as well as Figure 7 The active material layer in the figure is shown in a form with a certain degree of transparency, so as to facilitate the description of the positional relationship between the active material layer and the coating. In the actual manufacturing method, the active material layer can be a transparent material or an opaque material.

[0083] A second aspect of the present application provides a battery cell, comprising an electrode assembly prepared by the preparation method of the above embodiment.

[0084] The battery cell may also include an end cap, a housing, and other functional components.

[0085] The end cap refers to a component that covers the opening of the shell to isolate the internal environment of the battery cell from the external environment. Functional components such as electrode terminals can be provided on the end cap. The electrode terminal can be used to electrically connect to the electrode assembly to output or input electrical energy of the battery cell.

[0086] The housing is a component used to cooperate with the end caps to form the internal environment of the battery cell.

[0087] The battery cell may be a solid-state battery cell, and in the electrode assembly of the solid-state battery cell, a solid electrolyte membrane is further included between the anode electrode piece and the cathode electrode piece.

[0088] In the battery cell of this embodiment, since the electrode assembly is obtained by increasing the size of the positive and negative pole pieces during lamination, and then isostatically pressing the positive and negative pole pieces after lamination, and finally cutting off the excess material on the edges of the positive and negative pole pieces after static pressing according to the required size, since the positive and negative pole pieces are tightly adhered together during cutting, it can be ensured that the electrode assembly will not collapse and deform at the edge of the pole piece due to the high pressure of isostatic pressing, thereby causing the positive and negative poles of the battery cell to overlap and short-circuit. In this way, it is possible to avoid the existence of excess pole pieces at the edge of the electrode assembly, that is, to achieve the 0OH area, thereby solving the abnormality of the positive and negative poles overlapping and short-circuiting due to the collapse and deformation of the edge of the electrode assembly caused by isostatic pressing, and improving the production yield of the battery cell.

[0089] The third aspect of the present application provides a battery, comprising the battery cell provided in the second aspect of the present application.

[0090] Other structures and operations of the battery according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail here. The fourth aspect of the present application proposes an electrical device, including the battery of the embodiment of the third aspect of the present application, and the battery is used to provide electrical energy to the electrical device.

[0091] Other structures and operations of the electrical equipment according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail here.

[0092] The fifth aspect of the present application proposes an energy storage device, including the battery of the embodiment of the third aspect of the present application, and the battery is used to provide electrical energy to the energy storage device.

[0093] Specifically, the energy storage device includes one or more battery clusters (Battery Cluster) to increase the voltage and capacity of the energy storage device. The battery cluster may include multiple batteries, and the multiple batteries are connected in series through a busbar to increase the voltage of the energy storage device. When the energy storage device includes multiple battery clusters, the multiple battery clusters are connected in parallel to increase the capacity of the energy storage device. Among them, the battery may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly (Battery CellAssembly) may include multiple battery cells, and the multiple battery cells are connected in series, parallel or mixed through a busbar. In some embodiments, the battery cell assembly (Battery Cell Assembly) is generally formed by arranging multiple battery cells.

[0094] Energy storage devices can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems or temporary power supply systems. Energy storage devices can store electrical energy as needed and output electrical energy at the appropriate time. For example, energy storage devices can store electrical energy when electricity consumption is low, and provide electrical energy to relevant users or electrical equipment during peak electricity consumption. The energy storage device provided in the embodiment of the present application can be any power system that requires the use of energy storage devices.

[0095] In some embodiments, the energy storage device is an energy storage container or an energy storage cabinet.

[0096] In some embodiments, the energy storage device may include a cabinet and one or more battery clusters, wherein the battery clusters are accommodated in the cabinet.

[0097] In some embodiments, the energy storage device may include modules such as a thermal management module, a main control module, a master control module, a power distribution module, and a fire protection module.

[0098] As an example, the thermal management module may include a liquid cooling unit that provides cooling liquid for regulating the temperature of the battery cells to each battery through a pipeline.

[0099] As an example, the main control module can be used as a battery management unit of a battery cluster to monitor and manage the battery cluster. The main control module can monitor information such as the current, voltage, power or temperature of the battery cluster. For example, the charging and discharging current and voltage of the battery cluster can be controlled. The main control module includes a slave battery management unit (SBMU), a fusion switch and other modules.

[0100] As an example, the master control module can be used as a battery management unit of an energy storage device to monitor and manage the energy storage device. The master control module can monitor information such as the current, voltage, power, state of charge or temperature of the energy storage device. For example, the charging and discharging current, voltage, etc. of the energy storage device can be controlled. As an example, the master control module includes an insulation monitoring module IMM (Insulation Monitoring Module, abbreviated as IMM), a master battery management unit MBMU (Master Battery Management Unit, MBMU), Ethernet ETH (EtherNet, ETH) and a fiber optic conversion module.

[0101] As an example, the fire protection system includes a control panel, a detector, an alarm device, etc., which are used to detect, alarm or extinguish the energy storage device. As an example, the power distribution device can be used to distribute power to the power consumption module of the energy storage device.

[0102] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application is described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A method for preparing an electrode assembly, characterized in that: The preparation method comprises: Forming cathode electrode film roll and anode electrode film roll respectively; Cutting the cathode electrode sheet film roll and the anode electrode sheet film roll to obtain a plurality of cathode electrode sheets and anode electrode sheets of a first size; The cathode electrode sheet and the anode electrode sheet are stacked alternately by a lamination process to form a lamination structure; subjecting the laminate structure to isostatic pressing; The laminated structure after isostatic pressing is cut into pieces to obtain the electrode assembly of a second size, wherein the second size is smaller than the first size.

2. The preparation method according to claim 1, characterized in that: The first dimension includes a first length dimension L1 along a first direction and a first width dimension W1 along a second direction, the second dimension includes a second length dimension L2 along the first direction and a second width dimension W2 along the second direction, the first direction is the length direction of the electrode assembly, the second direction is the width direction of the electrode assembly, and the first direction and the second direction are coplanar and intersecting; L1 is greater than or equal to 1.05 times L2 and less than or equal to 1.2 times L2; The W1 is greater than or equal to 1.05 times the W2 and less than or equal to 1.2 times the W2.

3. The preparation method according to claim 1 or 2, characterized in that: The lamination structure after isostatic pressing is cut into pieces to obtain the electrode assembly of a second size, comprising: Determine the contour of the electrode assembly in the laminate structure, wherein the contour is in the central range of the laminate structure and the shape of the contour corresponds to the shape of the laminate structure; The laminate structure is cut according to the outline to obtain the electrode assembly.

4. The preparation method according to claim 3, characterized in that: The slitting method of the slitting process includes at least one of laser slitting, cutting knife slitting, die punching, blade back and forth cutting or disc blade rotary cutting.

5. The preparation method according to claim 1, characterized in that: The cathode electrode film roll and the anode electrode film roll are formed respectively, including: Providing a plurality of cathode substrates and anode substrates respectively; Coating a cathode material on the cathode substrate and an anode material on the anode substrate, and coating an insulating material on at least one end of the cathode substrate and / or the anode substrate along the second direction; A solid electrolyte membrane is coated on the cathode substrate or the anode substrate to form the cathode electrode sheet film roll and the anode electrode sheet film roll.

6. The preparation method according to claim 5, characterized in that: The cathode substrate comprises a cathode current collecting portion and a cathode tab protruding from the cathode current collecting portion along a second direction, the anode substrate comprises an anode current collecting portion and an anode tab protruding from the anode collecting portion along a second direction, a cathode material is coated on the cathode substrate and an anode material is coated on the anode substrate, and an insulating material is coated on at least one end of the cathode substrate and / or the anode substrate along the second direction, comprising: Applying the insulating material to the connection area between the cathode current collecting portion and the cathode tab and / or the connection area between the anode current collecting portion and the anode tab to form an insulating layer; The cathode material is applied to the cathode current collecting portion to form a cathode active material layer, and the anode material is applied to the anode current collecting portion to form an anode active material layer.

7. The preparation method according to claim 6, characterized in that: Along the second direction, the size of the insulating layer in the cathode tab is greater than or equal to the thickness of the anode tab, and less than or equal to 0.5 times the thickness of the cathode tab; Along the second direction, the size of the insulating layer in the anode tab is greater than or equal to the thickness of the cathode electrode sheet, and less than or equal to 0.5 times the thickness of the anode tab.

8. The preparation method according to claim 5, characterized in that: The cathode substrate and the anode substrate include at least one of a copper substrate, an aluminum substrate, a stainless steel substrate, an alloy substrate or a composite substrate.

9. The preparation method according to claim 5, characterized in that: The coating method may include extrusion coating or transfer coating.

10. The preparation method according to claim 5, characterized in that: The solid electrolyte membrane is at least one of a sulfide electrolyte membrane, an oxide electrolyte membrane or a halide electrolyte membrane.

11. A battery cell, characterized in that: The battery cell comprises an electrode assembly prepared by the preparation method according to any one of claims 1 to 10.

12. A battery, characterized in that: Comprising the battery cell according to claim 11.

13. An electrical equipment, characterized in that: The battery comprises the battery as claimed in claim 12, wherein the battery is used to provide electrical energy to the electrical device.

14. An energy storage device, characterized in that: Comprising the battery of claim 12.

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