Battery and electric equipment

Abstract

The utility model provides a battery and electric equipment, and relates to the technical field of batteries, the battery comprises a middle pole piece group, the middle pole piece group comprises a plurality of middle pole pieces stacked along a first direction, and each middle pole piece comprises a first current collector, a first positive electrode coating, a first negative electrode coating and a first insulation wrapping edge; the first positive electrode coating and the first negative electrode coating are respectively coated on two surfaces of the first current collector in the thickness direction; the periphery of the first current collector is coated with the first insulating wrapping edge, and the first insulating wrapping edge is located on the peripheral sides of the first positive electrode coating and the first negative electrode coating; and the two first insulating covered edges of the two adjacent middle pole pieces are connected. According to the battery provided by the invention, the size of the pole piece is small, the space occupancy rate in the shell can be reduced, and the energy sealing performance of the battery is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery and an electrical device. Background Art

[0002] Batteries are commonly used power supply devices in electrical equipment. For example, they can be used in electric vehicles and serve as the power source of electric vehicles.

[0003] The battery includes a housing and a plurality of pole pieces disposed in the housing, with each adjacent pole piece being insulated by a diaphragm. Each pole piece and diaphragm are disposed between two frames, and the adjacent pole pieces are connected by the frames.

[0004] However, the frame used to connect the multiple pole pieces in the above-mentioned related art will increase the volume of the combined structure of the pole pieces, thereby reducing the space utilization rate in the battery housing. Utility Model Content

[0005] The embodiments of the present application provide a battery and an electrical device for solving the technical problem in the above-mentioned related art that a frame for connecting multiple pole pieces will increase the volume of the combined structure of the pole pieces, thereby reducing the space utilization rate in the battery casing.

[0006] In order to achieve the above objectives, the embodiments of the present application provide the following technical solutions:

[0007] A first aspect of an embodiment of the present application provides a battery, comprising:

[0008] A middle electrode sheet group, comprising a plurality of middle electrode sheets stacked along a first direction, each of the middle electrode sheets comprising a first current collector, a first positive electrode coating, a first negative electrode coating and a first insulating edge;

[0009] The first positive electrode coating and the first negative electrode coating are respectively coated on two surfaces of the first current collector in a thickness direction;

[0010] The first insulating edge is coated on the outer periphery of the first current collector, and the first insulating edge is located on the outer periphery of the first positive electrode coating and the first negative electrode coating;

[0011] The two first insulating edges of two adjacent middle pole pieces are connected.

[0012] The embodiment of the present application provides a battery and an electrical device, in which, in the intermediate sheet group of the battery, the two surfaces of each intermediate sheet in the thickness direction are respectively coated with a first positive electrode coating and a first negative electrode coating, and the periphery of the first current collector is coated with a first insulating edging, the first insulating edging is located on the outer peripheral side of the first positive electrode coating and the first negative electrode coating, and the two adjacent first current collectors are connected by the first insulating edging coated on the periphery of the two first current collectors, thereby realizing the connection and fixation of multiple intermediate sheets, thereby avoiding the use of additional fixing structures to fix the intermediate sheets, and avoiding the use of additional fixing structures to connect adjacent intermediate sheets, thereby reducing the number of components in the battery, and because the thickness of the edging is thin and the volume is small, the volume of the intermediate sheet group after the multiple intermediate sheets are connected can be reduced, thereby reducing the occupied space of the intermediate sheet group and improving the space utilization rate in the battery shell.

[0013] Based on the above technical solution, this application can also be improved as follows.

[0014] In one possible implementation, the battery further includes a first separator;

[0015] The first diaphragm is disposed between each two adjacent first current collectors;

[0016] There is a first gap between the first insulating edge and the outer edge of the first positive electrode coating;

[0017] A second interval is provided between the first insulating edge and the outer edge of the first negative electrode coating.

[0018] In this way, by providing a first gap between the first insulating edge and the outer edge of the first positive electrode coating, and providing a second gap between the first insulating edge and the outer edge of the first negative electrode coating, the first insulating edge can be prevented from covering the first positive electrode coating and the first negative electrode coating, thereby preventing the first positive electrode coating and the first negative electrode coating from falling off the middle electrode sheet under the adhesive force of the first insulating edge.

[0019] In a possible implementation, the first insulating edge wrapping includes:

[0020] a first annular portion, disposed on one side surface of the first current collector in a thickness direction, and spaced apart on an outer circumference of the first positive electrode coating layer;

[0021] a second annular portion, provided on the other side surface of the first current collector in the thickness direction, and the second annular portion is provided at intervals on the outer circumference of the first negative electrode coating;

[0022] The first side portion covers the outer edge of the first current collector, and the first annular portion is connected to the second annular portion through the first side portion.

[0023] In this way, the first insulating edge comprises a first annular portion, a second annular portion and a first edge portion, which can realize covering of partial structures of the two side surfaces in the thickness direction of the first current collector, and can cover the outer edge of the first current collector. On the basis of ensuring the insulation of the outer edge of the first current collector, each intermediate sheet can be connected through the connection of an annular portion and a second annular portion on two adjacent intermediate sheets, which can increase the connection area between the two adjacent intermediate sheets, improve the connection stability between each intermediate sheet, and improve the structural stability of the intermediate sheet group.

[0024] Furthermore, the first annular portion, the second annular portion and the first side portion can completely wrap the outer edge of the first current collector layer, thereby improving the insulation effect between two adjacent intermediate sheets.

[0025] In a possible implementation, the width of the first annular portion and / or the width of the second annular portion is greater than or equal to 5 mm and less than or equal to 10 mm.

[0026] Thus, by ensuring that the width of the first annular portion and / or the width of the second annular portion is greater than or equal to 5 mm and less than or equal to 10 mm, a larger connection area can be provided between the first annular portion on one intermediate sheet and the adjacent second annular portion, thereby ensuring connection stability between the two adjacent intermediate sheets. Furthermore, the first annular portion and the second annular portion can be prevented from occupying the surface area of ​​both surfaces of the first current collector in the thickness direction, ensuring that the first positive electrode coating and the first negative electrode coating on the first current collector have a larger coating area, thereby ensuring the capacity of the assembled battery.

[0027] And / or, the thickness of the first current collector is greater than or equal to 20 μm and less than or equal to 100 μm.

[0028] Thus, by ensuring that the thickness of the first current collector is greater than or equal to 20 μm and less than or equal to 100 μm, on the one hand, sufficient structural strength of the first current collector can be ensured, reducing the risk of damage or tearing during transportation or use, thereby improving the durability of the first current collector. On the other hand, while ensuring the overall structural strength of the first current collector, the volume of the assembled intermediate electrode assembly can be prevented from increasing due to excessive thickness of the first current collector, thereby reducing the space occupied by the intermediate electrode assembly within the battery housing.

[0029] In a possible implementation, the first insulating edge wrapping accounts for less than or equal to 20% of the outer surface area of ​​the first current collector.

[0030] In this way, by making the percentage of the first insulating edge package to the outer surface of the first current collector less than or equal to 20%, it is possible to avoid the first insulating edge package occupying too much area of ​​the two surfaces in the thickness direction of the first current collector, thereby increasing the coating area of ​​the first positive electrode coating and the first negative electrode coating, which can help to increase the capacity of the battery.

[0031] In a possible implementation, the first insulating edge is ceramic insulating coating glue.

[0032] In this way, by setting the first insulating edge to ceramic insulating coating glue, the two connected intermediate sheets can be bonded through two ceramic insulating coating glue brackets, thereby improving the connection efficiency between the intermediate sheets and further improving the assembly efficiency of the intermediate sheet group and the battery.

[0033] In a possible implementation, in the first direction, the orthographic projections of the first positive electrode coating and the first negative electrode coating on each of the intermediate electrode sheets overlap.

[0034] Moreover, in the first direction, the orthographic projections of the first positive electrode coatings on two adjacent intermediate electrode sheets overlap.

[0035] In this way, the first insulating edges on each intermediate sheet can be arranged at almost the same position on the first current collector, thereby ensuring that the intermediate sheets do not become skewed during connection via the first insulating edges and guaranteeing connection stability between the intermediate sheets.

[0036] Furthermore, it can make the electric field more evenly distributed within the electrode, helping to reduce the phenomenon of local electric field enhancement, thereby reducing the probability of internal short circuits in the battery and improving battery safety. It also helps ensure the uniformity of the electrode reaction and reduce the unevenness of the battery during the charge and discharge process, thereby improving the overall electrochemical performance and cycle life of the battery.

[0037] In a possible implementation, the battery further includes a positive electrode lead-out tab and a negative electrode lead-out tab;

[0038] Along the first direction, the positive lead sheet is connected to one of the outermost intermediate electrodes, the negative lead sheet is connected to the other outermost intermediate electrode, and the intermediate electrode group is located between the positive lead sheet and the negative lead sheet.

[0039] In this way, the battery includes positive and negative lead sheets, and the intermediate sheet group is arranged between the positive and negative lead sheets, so that the intermediate sheet group can transmit current through the positive and negative lead sheets.

[0040] In one possible implementation, the positive electrode lead sheet includes:

[0041] Second collector;

[0042] a second positive electrode coating, applied on a side of the second current collector facing the middle electrode assembly;

[0043] a second insulating edge covering, covering the outer periphery of the second current collector, and the second insulating edge covering is located on the outer periphery of the second positive electrode coating, and the second insulating edge covering is connected to the first insulating edge covering of the outermost middle electrode sheet;

[0044] A positive electrode tab passes through the second insulating edge and is electrically connected to one end of the second current collector.

[0045] In this way, by providing a second insulating edge on the second current collector of the positive lead-out sheet, the positive lead-out sheet can be connected to the outermost intermediate sheet of the intermediate sheet group through the connection between the second insulating edge and the first insulating edge, thereby avoiding the second current collector being connected to the intermediate sheet group through additional structural components, reducing the number of components in the battery, and being able to reduce the volume of the positive lead-out sheet, and reduce the space occupancy of the positive lead-out sheet inside the battery shell, thereby improving the utilization rate of the internal space of the battery shell.

[0046] In one possible implementation, the negative electrode lead sheet includes:

[0047] The third set of fluids;

[0048] a second negative electrode coating, coated on a side of the third current collector facing the middle electrode assembly;

[0049] a third insulating edge covering, covering the outer periphery of the third current collector, and the third insulating edge covering is located on the outer periphery of the second negative electrode coating, and the third insulating edge covering is connected to the first insulating edge covering of the outermost middle electrode sheet in the middle electrode sheet group;

[0050] A negative electrode tab passes through the third insulating edge and is electrically connected to one end of the third current collector.

[0051] In this way, by providing a third insulating edge on the third current collector of the negative lead-out sheet, the negative lead-out sheet can be connected to the outermost intermediate sheet of the intermediate sheet group through the connection between the third insulating edge and the first insulating edge, thereby avoiding the third current collector being connected to the intermediate sheet group through additional structural components, reducing the number of components in the battery, and can reduce the volume of the negative lead-out sheet, and reduce the space occupancy of the negative lead-out sheet inside the battery shell, thereby improving the utilization rate of the internal space of the battery shell.

[0052] In a possible implementation, the battery further includes a housing;

[0053] The intermediate electrode assembly, the positive electrode lead-out sheet, and the negative electrode lead-out sheet are all disposed in the housing;

[0054] The shell is provided with a first opening and a second opening communicating with the interior of the shell, the positive electrode tab passes through the first opening and extends to the outside of the shell, and the negative electrode tab passes through the second opening and extends to the outside of the shell;

[0055] A portion of the second insulating edge is located in the first opening and seals the first opening, and a portion of the third insulating edge is located in the second opening and seals the second opening.

[0056] In this way, by arranging the middle electrode plate group, the positive electrode lead-out plate and the negative electrode lead-out plate in the shell, the positive electrode tab on the positive electrode lead-out plate passes through the first opening and extends to the outside of the shell, and the negative electrode tab passes through the second opening and extends to the outside of the shell, thereby realizing the transmission of current by the middle electrode plate group, the positive electrode lead-out plate and the negative electrode lead-out plate through the positive electrode tab and the negative electrode tab.

[0057] Furthermore, by locating a portion of the second insulating edge within the first opening, the second insulating edge, the positive electrode tab and the first opening can be interference fit, the second insulating edge and the positive electrode tab can be pressed tightly within the first opening, and the first opening can be sealed, thereby at least preventing the electrolyte in the shell from leaking from the first opening and preventing external impurities from entering the shell through the first opening.

[0058] Furthermore, by locating a portion of the third insulating edge within the second opening, the third insulating edge, the positive electrode tab and the first opening can be interference fit, the third insulating edge and the positive electrode tab can be pressed tightly within the second opening, and the second opening can be sealed, thereby at least preventing the electrolyte in the shell from leaking from the second opening and preventing external impurities from entering the shell through the second opening.

[0059] In a possible implementation, the first opening and the second opening are arranged opposite to each other in the width direction of the housing;

[0060] Alternatively, the first opening and the second opening are located on the same side of the housing in the width direction, and the first opening and the second opening are arranged at intervals along the length direction of the housing.

[0061] In this way, when the first opening and the second opening are located on the same side in the width direction of the shell, the first opening and the second opening are arranged at intervals along the length direction of the shell, so that the first opening and the second opening can be completely staggered in the length direction of the shell, avoiding electrical connection and contact between the positive electrode tab extending from the first opening and the negative electrode tab extending from the second opening.

[0062] In one possible implementation, the battery further includes a second separator;

[0063] The second diaphragm is disposed between the second current collector and the first current collector;

[0064] A third interval is provided between the second insulating edge and the outer edge of the second positive electrode coating.

[0065] In this way, by using the second separator to stick to the second positive electrode coating, the second positive electrode coating on the positive electrode lead sheet can be prevented from directly contacting the first positive electrode coating or the first negative electrode coating on the outermost intermediate electrode sheet in the intermediate electrode sheet group.

[0066] Furthermore, by providing a third gap between the second insulating edge and the outer edge of the second positive electrode coating, the second insulating edge can be prevented from covering the second positive electrode coating, thereby preventing the second positive electrode coating from falling off the positive electrode lead-out sheet under the adhesive force of the second insulating edge.

[0067] In a possible implementation, a third diaphragm is further included;

[0068] The third diaphragm is disposed between the third current collector and the first current collector;

[0069] A fourth interval is provided between the third insulating edge and the outer edge of the second negative electrode coating.

[0070] In this way, by using the third separator to stick to the second negative electrode coating, the second negative electrode coating on the negative electrode lead sheet can be prevented from directly contacting the first positive electrode coating or the first negative electrode coating on the outermost intermediate electrode sheet in the intermediate electrode sheet group.

[0071] Furthermore, by providing a fourth gap between the third insulating edge and the outer edge of the second negative electrode coating, the third insulating edge can be prevented from covering the second negative electrode coating, thereby preventing the second negative electrode coating from falling off the negative electrode lead-out sheet under the adhesive force of the third insulating edge.

[0072] A second aspect of an embodiment of the present application provides an electric device, which includes an electric device and the battery as described above, wherein the battery is used to supply power to the electric device.

[0073] An embodiment of the present application provides an electric device, which uses the above-mentioned battery to connect with the electric device and provide the function of the electric device, thereby reducing the space occupied by the battery on the electric device, improving the space utilization of the electric device, and thus improving the practicality of the electric device. BRIEF DESCRIPTION OF THE DRAWINGS

[0074] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0075] Figure 1 A schematic diagram of the structure of a battery provided in an embodiment of the present application;

[0076] Figure 2 for Figure 1 A cross-sectional view of a battery in FIG;

[0077] Figure 3 for Figure 2 Local schematic diagram at N in the middle;

[0078] Figure 4 A schematic structural diagram of a middle electrode provided in an embodiment of the present application;

[0079] Figure 5 for Figure 4 Schematic diagram of the cross section of the middle pole piece at AA;

[0080] Figure 6 A schematic structural diagram of a positive electrode lead-out sheet provided in an embodiment of the present application;

[0081] Figure 7 for Figure 6 Schematic diagram of the cross section of the positive electrode lead-out piece at BB;

[0082] Figure 8 A schematic structural diagram of a negative electrode lead-out sheet provided in an embodiment of the present application;

[0083] Figure 9 for Figure 8 Schematic diagram of the cross section of the negative electrode lead at CC.

[0084] Description of reference numerals:

[0085] 10-battery;

[0086] 100-middle pole piece group;

[0087] 110-middle pole piece;

[0088] 111-first current collector; 112-first positive electrode coating; 113-first negative electrode coating;

[0089] 114-first insulating edge; 115-first interval; 116-second interval;

[0090] 1141 - first annular portion; 1142 - second annular portion; 1143 - first side portion;

[0091] 200-electrolyte;

[0092] 300-first diaphragm;

[0093] 400-positive electrode lead sheet;

[0094] 410 - second current collector; 420 - second positive electrode coating; 430 - second insulating edge;

[0095] 440-positive electrode tab; 450-third interval;

[0096] 431 - third annular portion; 432 - fourth annular portion; 433 - second side portion;

[0097] 500-negative electrode lead sheet;

[0098] 510 - third current collector; 520 - second negative electrode coating; 530 - third insulating edge;

[0099] 540-negative electrode tab; 550-fourth interval;

[0100] 531 - fifth annular portion; 532 - sixth annular portion; 533 - third side portion;

[0101] 600-shell;

[0102] 610-first opening; 620-second opening;

[0103] 700-second diaphragm;

[0104] 800-Third diaphragm. DETAILED DESCRIPTION

[0105] As described in the background art, the frame used to connect multiple pole pieces in the related art will increase the volume of the combined structure of the pole pieces, thereby reducing the space utilization rate in the battery housing.

[0106] The reason for this problem is that the pole pieces in the related art are fixed by a frame structure, and the adjacent pole pieces are also fixed by the frame structure. Since the frame structure, as a structural component, has a certain thickness and height, the volume of the assembled pole pieces will increase significantly after the pole pieces are fixed and connected. When the combination of the pole piece and the frame structure is installed in the housing, it will occupy a large space inside the housing, reducing the energy density of the battery. Alternatively, a larger housing is required to accommodate the combination of the pole piece and the frame structure, which further increases the volume of the battery and increases the space occupied by the battery in the electrical device.

[0107] In response to the above technical problems, an embodiment of the present application provides a battery and an electrical device, in which, in the intermediate sheet group of the battery, the two surfaces in the thickness direction of each intermediate sheet are respectively coated with a first positive electrode coating and a first negative electrode coating, and the periphery of the first current collector is coated with a first insulating edging, the first insulating edging is located on the outer peripheral side of the first positive electrode coating and the first negative electrode coating, and the two adjacent first current collectors are connected by the first insulating edging coated on the outer periphery of the two first current collectors, thereby realizing the connection and fixation of multiple intermediate sheets, thereby avoiding the use of additional fixing structures to fix the intermediate sheets, and avoiding the use of additional fixing structures to connect adjacent intermediate sheets, thereby reducing the number of components in the battery, and because the thickness of the edging is thin and the volume is small, the volume of the intermediate sheet group after the multiple intermediate sheets are connected can be reduced, thereby reducing the occupied space of the intermediate sheet group and improving the space utilization rate in the battery shell.

[0108] In order to make the above-mentioned purposes, features and advantages of the embodiments of the present application more obvious and easy to understand, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0109] refer to Figure 1 and Figure 2 An embodiment of the present application provides a battery 10 , which may include a middle electrode assembly 100 , and the middle electrode assembly 100 may be disposed in a housing 600 of the battery 10 .

[0110] The middle electrode assembly 100 may include a plurality of electrodes along a first direction (eg Figure 2 The intermediate electrode sheets 110 are stacked in the middle electrode sheet group 100 (in the middle X direction), and each intermediate electrode sheet 110 may include a first current collector 111, a first positive electrode coating 112, a first negative electrode coating 113, and a first insulating edge 114. The first direction may be the thickness direction of each intermediate electrode sheet 110 in the intermediate electrode sheet group 100.

[0111] In some embodiments, the battery 10 may be a bipolar battery, and each intermediate electrode 110 in the intermediate electrode assembly 100 may be a bipolar electrode.

[0112] refer to Figure 2 and Figure 3 The first current collector 111 can be a metal paddle, and the first positive electrode coating 112 and the first negative electrode coating 113 are respectively coated on the first current collector 111 in the thickness direction (such as Figure 2 Two surfaces in the X direction).

[0113] When multiple intermediate electrode sheets 110 are stacked along a first direction, if each first current collector 111 has a first surface and a second surface, the first positive electrode coating 112 on each intermediate electrode sheet 110 is coated on the first surface of the first current collector 111, and the first negative electrode coating 113 on each intermediate electrode sheet 110 is coated on the second surface of the first current collector 111. The first surfaces of the two first current collectors 111 in each two adjacent intermediate electrode sheets 110 face the same side in the stacking direction.

[0114] The first insulating edge 114 is coated around the outer periphery of the first current collector 111 and is located on the outer periphery of the first positive electrode coating 112 and the first negative electrode coating 113. The two first insulating edges 114 in two adjacent middle electrode sheets 110 are connected.

[0115] It should be noted that the periphery of the first current collector 111 here may include the outer edge of the first current collector 111 and partial areas of the two surfaces in the thickness direction of the first current collector 111, and the partial areas on the two surfaces are close to the outer edge of the first current collector 111.

[0116] In some embodiments, the first insulating edge 114 can be coated on the outer periphery of the first current collector 111. The first insulating edge 114 can have a certain degree of viscosity, so that the middle electrodes 110 can be connected by bonding through the first insulating edge 114.

[0117] By using the first insulating edge 114 to cover the outer periphery of the first current collector 111 , a short circuit connection between two connected first current collectors 111 can be avoided, thereby preventing an internal short circuit in the battery 10 and improving the safety of the battery 10 .

[0118] The embodiment of the present application provides a battery 10. In the intermediate sheet group of the battery 10, the two surfaces of each intermediate sheet in the thickness direction are respectively coated with a first positive electrode coating 112 and a first negative electrode coating 113, and the outer periphery of the first current collector 111 is coated with a first insulating edging 114. The first insulating edging 114 is located on the outer periphery of the first positive electrode coating 112 and the first negative electrode coating 113, and the two adjacent first current collectors 111 are connected by the first insulating edging 114 coated on the outer periphery of the two first current collectors 111, thereby realizing the connection and fixation of multiple intermediate sheets, thereby avoiding the use of additional fixing structures to fix the intermediate sheets, and avoiding the use of additional fixing structures to connect adjacent intermediate sheets, thereby reducing the number of components in the battery 10, and because the thickness of the edging is thin and the volume is small, the volume of the intermediate sheet group after the multiple intermediate sheets are connected can be reduced, thereby reducing the occupied space of the intermediate sheet group 100 and improving the space utilization rate in the battery 10 shell 600.

[0119] In some embodiments, the first current collector 111 can be a copper-aluminum composite foil formed by combining copper foil and aluminum foil, the first positive electrode coating 112 is coated on the aluminum foil surface of the copper-aluminum composite foil, and the first negative electrode coating 113 can be coated on the copper foil surface of the copper-aluminum composite foil.

[0120] Furthermore, the first positive electrode coating 112 and the first negative electrode coating 113 can be coated close to the middle of the first current collector 111, and the outer edges of the first positive electrode coating 112 and / or the first negative electrode coating 113 are approximately the same distance from the outer edge of the first current collector 111 in all directions.

[0121] When the outer edges of the first positive electrode coating 112 and the first negative electrode coating 113 are polygonal, each side of the outer edge of the first positive electrode coating 112 can be parallel to each side of the corresponding first current collector 111, and each side of the outer edge of the first negative electrode coating 113 can also be parallel to each side of the corresponding first current collector 111. In this way, the process of the first insulating edge 114 covering the outer periphery of the first current collector 111 can be improved, thereby improving assembly efficiency.

[0122] refer to Figure 2 and Figure 3 In some embodiments, the battery 10 may further include a plurality of first separators 300. The first separator 300 is disposed between each two adjacent first current collectors 111. The first separator 300 can insulate the adjacent two middle electrode sheets 110 from each other.

[0123] A first gap 115 is defined between the first insulating edge 114 and the outer edge of the first positive electrode coating 112 . The first gap 115 can accommodate a portion of the electrolyte 200 .

[0124] A second gap 116 is provided between the first insulating edge 114 and the outer edge of the first negative electrode coating 113. The second gap 116 can also accommodate a portion of the electrolyte 200. The electrolyte 200 can be in a liquid, semi-solid or solid state.

[0125] In one example, since the first diaphragm 300 is located between two adjacent intermediate electrodes 110, one side of the first diaphragm 300 in the thickness direction can cover the first positive electrode coating 112 and the first spacer 115 of one of the intermediate electrodes 110, and the other side of the first diaphragm 300 in the thickness direction can cover the first negative electrode coating 113 and the second spacer 116 of the other intermediate electrode 110.

[0126] In this way, by providing a first gap 115 between the first insulating edge 114 and the outer edge of the first positive electrode coating 112, and providing a second gap 116 between the first insulating edge 114 and the outer edge of the first negative electrode coating 113, the first insulating edge 114 can be prevented from covering the first positive electrode coating 112 and the first negative electrode coating 113, thereby preventing the first positive electrode coating 112 and the first negative electrode coating 113 from falling off the middle electrode sheet due to the adhesive force of the first insulating edge 114.

[0127] The first diaphragm 300 is made of polypropylene or polyethylene, which is relatively soft and allows the electrolyte to pass through the first diaphragm 300. The function of the first diaphragm 300 is to allow only ion migration to occur between the adjacent first positive electrode coating 112 and the first negative electrode coating 113 while shielding electronic conduction, thereby avoiding the occurrence of battery short circuit. The electrolyte is not only distributed in the first gap 115 and the second gap 116, but can also be distributed between the first positive electrode coating 112 and the first diaphragm 300, and between the first negative electrode coating 113 and the first diaphragm 300. The flow of the electrolyte is only limited to the two adjacent middle electrodes 110 and their first insulating edge 114 areas. The first diaphragm 300 does not play a sealing role.

[0128] refer to Figure 3 、 Figure 4 and Figure 5 In some embodiments, the first insulating edge 114 may include a first annular portion 1141 , a second annular portion 1142 and a first edge portion 1143 .

[0129] The first annular portion 1141 is provided on one side surface of the first current collector 111 in the thickness direction, and is spaced apart from the outer periphery of the first positive electrode coating 112. The second annular portion 1142 is provided on the other side surface of the first current collector 111 in the thickness direction, and is spaced apart from the outer periphery of the first negative electrode coating 113. The first edge portion 1143 wraps around the outer edge of the first current collector 111, and the first annular portion 1141 is connected to the second annular portion 1142 via the first edge portion 1143.

[0130] In some examples, the first annular portion 1141 , the second annular portion 1142 , and the first edge portion 1143 may be an integral structure.

[0131] In this way, the first insulating edge 114 can include a first annular portion 1141, a second annular portion and a first edge portion 1143, so as to cover part of the structure of the two side surfaces in the thickness direction of the first current collector 111, and can cover the outer edge of the first current collector 111. On the basis of ensuring the insulation of the outer edge of the first current collector 111, each intermediate sheet can be connected through the connection of an annular portion and a second annular portion 1142 on two adjacent intermediate sheets, which can increase the connection area between the two adjacent intermediate sheets, improve the connection stability between each intermediate sheet, and improve the structural stability of the intermediate sheet group 100.

[0132] Furthermore, the first annular portion 1141 , the second annular portion 1142 and the first side portion 1143 can completely wrap the outer edge of the first current collector 111 layer, thereby improving the insulation effect between two adjacent intermediate sheets.

[0133] refer to Figure 4 In some embodiments, the width of the first annular portion 1141 (eg Figure 4 h1) and / or the width of the second annular portion 1142 is greater than or equal to 5 mm and less than or equal to 10 mm.

[0134] The width h1 of the first annular portion 1141 may be any value selected from the group consisting of 5 mm, 6 mm, 8 mm, and 9 mm. Alternatively, the width h1 of the first annular portion 1141 may be any value within a range of 5 mm or more and 10 mm or less.

[0135] The width of the second annular portion 1142 can be one of 5 mm, 6 mm, 8 mm, and 9 mm. Alternatively, the width of the second annular portion 1142 can be any value within a range of greater than or equal to 5 mm and less than or equal to 10 mm. The width h1 of the first annular portion 1141 and the width of the second annular portion 1142 can be the same, so that in two adjacent intermediate pole pieces 110, the contact area between the first annular portion 1141 on one intermediate pole piece 110 and the second annular portion 1142 on the other intermediate pole piece 110 can be increased.

[0136] Thus, by ensuring that the width h1 of the first annular portion 1141 and / or the width of the second annular portion 1142 is greater than or equal to 5 mm and less than or equal to 10 mm, a larger connection area can be created between the first annular portion 1141 on one intermediate sheet and the adjacent second annular portion 1142, thereby ensuring connection stability between the two adjacent intermediate sheets. Furthermore, the first annular portion 1141 and the second annular portion 1142 can be prevented from occupying the surface area of ​​both surfaces of the first current collector 111 in the thickness direction, thereby ensuring a larger coating area for the first positive electrode coating 112 and the first negative electrode coating 113 on the first current collector 111, thereby ensuring the capacity of the assembled battery 10.

[0137] refer to Figure 5 In some embodiments, the thickness of the first current collector 111 (eg Figure 5 The thickness h2 of the first current collector 111 may be any value within the range of 20 μm to 100 μm.

[0138] Thus, by ensuring that the thickness of the first current collector 111 is greater than or equal to 20 μm and less than or equal to 100 μm, on the one hand, sufficient structural strength of the first current collector 111 can be ensured, reducing the risk of damage or tearing of the first current collector 111 during transportation or use, thereby improving the durability of the first current collector 111. On the other hand, while ensuring the overall structural strength of the first current collector 111, an increase in the volume of the assembled intermediate electrode assembly 100 due to an excessive thickness of the first current collector 111 can be avoided, thereby reducing the space occupied by the intermediate electrode assembly within the housing 600 of the battery 10.

[0139] refer to Figure 4 In some embodiments, the first insulating edge 114 accounts for less than or equal to 20% of the outer surface area of ​​the first current collector 111 .

[0140] In this way, by making the percentage of the first insulating edge 114 on the outer surface of the first current collector 111 less than or equal to 20%, the first insulating edge 114 can be prevented from occupying too much area of ​​the two surfaces in the thickness direction of the first current collector 111, thereby increasing the coating area of ​​the first positive electrode coating 112 and the first negative electrode coating 113, which can help to increase the capacity of the battery 10.

[0141] refer to Figure 4In some embodiments, the first insulating edge 114 is a ceramic insulating coating adhesive. The ceramic insulating coating adhesive can be a mixture of boehmite and a polymer binder, which can improve the corrosion resistance and insulation performance of the first insulating edge 114.

[0142] In this way, by setting the first insulating edge 114 to ceramic insulating coating glue, the two connected intermediate sheets can be bonded through two ceramic insulating coating glue brackets, thereby improving the connection efficiency between the intermediate sheets and further improving the assembly efficiency of the intermediate sheet group 100 and the battery 10.

[0143] refer to Figure 2 In some embodiments, in the first direction, the orthographic projections of the first positive electrode coating 112 and the first negative electrode coating 113 on each intermediate electrode sheet 110 overlap. In the first direction, the orthographic projections of the first positive electrode coating 112 on two adjacent intermediate electrode sheets 110 overlap.

[0144] In this way, the first insulating edges 114 on each intermediate sheet can be arranged at almost the same position on the first current collector 111, thereby ensuring that the intermediate sheets do not become skewed during connection via the first insulating edges 114 and guaranteeing the connection stability between the intermediate sheets.

[0145] Furthermore, the electric field distribution within the electrode sheet can be made more uniform, which helps reduce the phenomenon of local electric field enhancement, thereby reducing the probability of internal short circuits in the battery 10 and improving the safety of the battery 10. It also helps ensure the uniformity of the electrode reaction and reduces the unevenness of the battery 10 during the charge and discharge process, thereby improving the overall electrochemical performance and cycle life of the battery 10.

[0146] refer to Figure 2 and Figure 3 In some embodiments, the battery 10 may further include a positive electrode lead-out sheet 400 and a negative electrode lead-out sheet 500. Along the first direction, the positive electrode lead-out sheet 400 is connected to one of the outermost intermediate electrode sheets 110, and the negative electrode lead-out sheet 500 is connected to the other outermost intermediate electrode sheet 110. The intermediate electrode sheet assembly 100 is located between the positive electrode lead-out sheet 400 and the negative electrode lead-out sheet 500.

[0147] In this way, the battery 10 can include a positive lead-out sheet 400 and a negative lead-out sheet 500, and the intermediate sheet group 100 is set between the positive lead-out sheet 400 and the negative lead-out sheet 500, so that the intermediate sheet group 100 can transmit current through the positive lead-out sheet 400 and the negative lead-out sheet 500.

[0148] refer to Figure 6 and Figure 7In some embodiments, the positive electrode lead-out sheet 400 may include a second current collector 410 , a second positive electrode coating 420 , a second insulating edge 430 , and a positive electrode tab 440 .

[0149] The second current collector 410 is located on one side of the intermediate electrode assembly 100 along the first direction, and the second positive electrode coating 420 is coated on the side of the second current collector 410 facing the intermediate electrode assembly 100, and the second positive electrode coating 420 is arranged opposite to the first negative electrode coating 113 on the outermost intermediate electrode 110 in the intermediate electrode assembly 100.

[0150] The second insulating edge 430 is coated on the outer periphery of the second current collector 410 and is located on the outer periphery of the second positive electrode coating 420 . The second insulating edge 430 is connected to the first insulating edge 114 of the outermost middle electrode sheet 110 .

[0151] It should be noted that the periphery of the second current collector 410 here may include the outer edge of the second current collector 410 and partial areas of the two surfaces in the thickness direction of the second current collector 410, and the partial areas on the two surfaces are close to the outer edge of the second current collector 410.

[0152] One end of the positive electrode tab 440 is connected to the end of the second current collector 410 , and the other end of the positive electrode tab 440 passes through the second insulating edge 430 and is electrically connected to one end of the second current collector 410 .

[0153] In this way, by providing a second insulating edge 430 on the second current collector 410 of the positive lead-out sheet 400, the positive lead-out sheet 400 can be connected to the outermost intermediate sheet 110 of the intermediate sheet group 100 through the connection between the second insulating edge 430 and the first insulating edge 114, thereby avoiding the second current collector 410 from being connected to the intermediate sheet group 100 through additional structural components, reducing the number of components in the battery 10, and being able to reduce the volume of the positive lead-out sheet 400, and reduce the space occupancy rate of the positive lead-out sheet 400 inside the shell 600 of the battery 10, thereby improving the utilization rate of the internal space of the shell 600 of the battery 10.

[0154] refer to Figure 2 and Figure 3 In some embodiments, the battery 10 may further include a second separator 700 , which is disposed between the second current collector 410 and the first current collector 111 . Specifically, the second separator 700 is disposed between the first insulating edge 114 and the second insulating edge 430 .

[0155] A third space 450 is defined between the second insulating edge 430 and the outer edge of the second positive electrode coating 420 . The third space 450 can accommodate a portion of the electrolyte 200 .

[0156] In this way, by using the second separator 700 to be applied to the second positive electrode coating 420, it is possible to prevent the second positive electrode coating 420 on the positive electrode lead sheet 400 from directly contacting the first positive electrode coating 112 or the first negative electrode coating 113 on the outermost intermediate electrode sheet 110 in the intermediate electrode sheet assembly 100. The second separator 700 is made of polypropylene or polyethylene, which is relatively soft and allows the electrolyte to pass through the second separator 700. The second separator 700 allows only ion migration to occur between the second positive electrode coating 420 and the first positive electrode coating 112 or the first negative electrode coating 113 on the outermost intermediate electrode sheet 110 in the intermediate electrode sheet assembly 100, while shielding electronic conduction, thereby preventing the occurrence of battery short circuits.

[0157] The electrolyte can be distributed not only in the third spacer 450, but also between the second positive electrode coating 420 and the second diaphragm 700. The flow of the electrolyte is limited to the positive electrode lead-out sheet 400, the middle electrode sheet 110 and its second insulating edge 430 area, and the second diaphragm 700 does not play a sealing role.

[0158] Furthermore, by providing a third gap 450 between the second insulating edging 430 and the outer edge of the second positive electrode coating 420, the second insulating edging 430 can be prevented from covering the second positive electrode coating 420, thereby preventing the second positive electrode coating 420 from falling off the positive electrode lead-out sheet 400 under the adhesive force of the second insulating edging 430.

[0159] refer to Figure 6 and Figure 7 In some embodiments, the material of the second insulating edging 430 can be the same as that of the first insulating edging 114, and the second insulating edging 430 can include a third annular portion 431, a fourth annular portion 432 and a second edge portion 433. The third annular portion 431 is arranged on the surface of the second positive electrode coating 420 on the second current collector 410, and the third annular portion 431 is arranged at intervals on the outer peripheral side of the second positive electrode coating 420, the fourth annular portion 432 is arranged on the other side of the second current collector 410 in the thickness direction, and the second edge portion 433 is arranged at the outer edge of the second current collector 410. The third annular portion 431 is connected to the fourth annular portion 432 through the second edge portion 433. The third annular portion 431, the second edge portion 433 and the fourth annular portion 432 can be an integrated structure.

[0160] In some embodiments, the widths of the third annular portion 431 and the fourth annular portion 432 may be the same, and the widths of the third annular portion 431 and the first annular portion 1141 may be the same.

[0161] refer to Figure 2 and Figure 3In some embodiments, the negative electrode lead-out sheet 500 may include a third current collector 510 , a second negative electrode coating 520 , a third insulating edge 530 , and a negative electrode tab 540 .

[0162] The third current collector 510 is located on the side of the intermediate electrode assembly 100 facing away from the second current collector 410. The second negative electrode coating 520 is applied to the side of the third current collector 510 facing the intermediate electrode assembly 100, and the second negative electrode coating 520 is arranged opposite to the first positive electrode coating 112 on the outermost intermediate electrode 110 in the intermediate electrode assembly 100.

[0163] The third insulating edge 530 is coated on the outer periphery of the third current collector 510 and is located on the outer periphery of the second negative electrode coating 520 . The third insulating edge 530 is connected to the first insulating edge 114 of the outermost middle electrode 110 in the middle electrode assembly 100 .

[0164] It should be noted that the periphery of the third current collector 510 here may include the outer edge of the third current collector 510 and partial areas of the two surfaces in the thickness direction of the third current collector 510, and the partial areas on the two surfaces are close to the outer edge of the third current collector 510.

[0165] One end of the negative electrode tab 540 is connected to the end of the third current collector 510 , and the other end of the negative electrode tab 540 passes through the third insulating edge 530 and is electrically connected to one end of the third current collector 510 .

[0166] In this way, by providing a third insulating edge 530 on the third current collector 510 of the negative lead-out sheet 500, the negative lead-out sheet 500 can be connected to the outermost intermediate sheet 110 of the intermediate sheet group 100 through the connection between the third insulating edge 530 and the first insulating edge 114, thereby avoiding the third current collector 510 from being connected to the intermediate sheet group 100 through additional structural components, reducing the number of components in the battery 10, and being able to reduce the volume of the negative lead-out sheet 500, and reducing the space occupancy rate of the negative lead-out sheet 500 inside the shell 600 of the battery 10, thereby improving the utilization rate of the internal space of the shell 600 of the battery 10.

[0167] In some embodiments, the thickness of the third current collector 510, the thickness of the second current collector 410, and the thickness of the first current collector 111 may be the same. For example, the thickness of the first current collector 111, the second current collector 410, and the third current collector 510 may all be 50 μm.

[0168] refer to Figure 2 and Figure 3 In some embodiments, a third diaphragm 800 may also be included.

[0169] The third separator 800 is disposed between the third current collector 510 and the first current collector 111 . Specifically, the third separator 800 is disposed between the first insulating edge 114 and the third insulating edge 530 .

[0170] A fourth space 550 is defined between the third insulating edge 530 and the outer edge of the second negative electrode coating 520 . The fourth space 550 can accommodate a portion of the electrolyte 200 .

[0171] In this way, by using the third separator 800 to adhere to the second negative electrode coating 520, direct contact between the second negative electrode coating 520 on the negative electrode lead sheet 500 and the first positive electrode coating 112 or the first negative electrode coating 113 on the outermost intermediate electrode sheet 110 in the intermediate electrode sheet group 100 can be avoided.

[0172] Furthermore, by providing a fourth gap 550 between the third insulating edge 530 and the outer edge of the second negative electrode coating 520, the third insulating edge 530 can be prevented from covering the second negative electrode coating 520, thereby preventing the second negative electrode coating 520 from falling off from the negative electrode lead-out sheet 500 under the adhesive force of the third insulating edge 530.

[0173] The third diaphragm 800 is made of polypropylene or polyethylene, which is relatively soft and allows the electrolyte to pass through the third diaphragm 800. The third diaphragm 800 allows only ion migration to occur between the second negative electrode coating 520 and the first positive electrode coating 112 or the first negative electrode coating 113 on the outermost intermediate electrode 110 in the intermediate electrode group 100, while shielding electronic conduction, thereby avoiding the occurrence of battery short circuit.

[0174] The electrolyte can be distributed not only in the fourth spacer 550, but also between the second negative electrode coating 520 and the third separator 800. The flow of the electrolyte is limited to the negative electrode lead-out sheet 500, the middle electrode sheet 110 and its third insulating edge 530 area. The third separator 800 does not play a sealing role.

[0175] refer to Figure 7 and Figure 8In some embodiments, the material of the third insulating edging 530 can be the same as that of the first insulating edging 114, and the third insulating edging 530 can include a fifth annular portion 531, a sixth annular portion 532 and a third side portion 533. The fifth annular portion 531 is arranged on the surface of the third current collector 510 where the second negative electrode coating 520 is located, and the fifth annular portion 531 is spaced apart on the outer peripheral side of the second negative electrode coating 520, the sixth annular portion 532 is arranged on the other side in the thickness direction of the third current collector 510, and the third side portion 533 is arranged at the outer edge of the third current collector 510. The fifth annular portion 531 is connected to the sixth annular portion 532 through the third side portion 533. The fifth annular portion 531, the third side portion 533 and the sixth annular portion 532 can be an integrated structure.

[0176] In some embodiments, the fifth annular portion 531 and the sixth annular portion 532 may have the same width, and the fifth annular portion 531 and the first annular portion 1141 may have the same width.

[0177] refer to Figure 1 、 Figure 2 and Figure 3 In some embodiments, the battery 10 may further include a shell 600 , in which the intermediate electrode assembly 100 , the positive electrode lead-out sheet 400 , and the negative electrode lead-out sheet 500 are all disposed.

[0178] The housing 600 is provided with a first opening 610 and a second opening 620 communicating with the interior of the housing 600 . The positive electrode tab 440 passes through the first opening 610 and extends to the outside of the housing 600 . The negative electrode tab 540 passes through the second opening 620 and extends to the outside of the housing 600 .

[0179] A portion of the second insulating edge 430 is located in the first opening 610 and seals the first opening 610 , and a portion of the third insulating edge 530 is located in the second opening 620 and seals the second opening 620 .

[0180] In this way, by arranging the middle electrode plate group 100, the positive electrode lead-out plate 400 and the negative electrode lead-out plate 500 in the shell 600, the positive electrode tab 440 on the positive electrode lead-out plate 400 passes through the first opening 610 and extends to the outside of the shell 600, and the negative electrode tab 540 passes through the second opening 620 and extends to the outside of the shell 600, thereby realizing the transmission of current by the middle electrode plate group 100, the positive electrode lead-out plate 400 and the negative electrode tab 540.

[0181] Furthermore, by positioning a portion of the second insulating edge 430 within the first opening 610, the second insulating edge 430, the positive electrode tab 440 and the first opening 610 can be interference fit, the second insulating edge 430 and the positive electrode tab 440 can be pressed tightly within the first opening 610, and the first opening 610 can be sealed, thereby at least preventing the electrolyte 200 in the shell 600 from leaking from the first opening 610, and preventing external impurities from entering the shell 600 through the first opening 610.

[0182] Furthermore, by positioning a portion of the third insulating edge 530 within the second opening 620, the third insulating edge 530, the positive electrode tab 440 and the first opening 610 can be interference fit, the third insulating edge 530 and the positive electrode tab 440 can be pressed tightly within the second opening 620, and the second opening 620 can be sealed, thereby at least preventing the electrolyte 200 within the shell 600 from leaking from the second opening 620, and preventing external impurities from entering the shell 600 through the second opening 620.

[0183] refer to Figure 1 and Figure 2 In some embodiments, the first opening 610 and the second opening 620 are arranged in the width direction of the housing 600 (eg Figure 1 X direction) relative settings.

[0184] Alternatively, the first opening 610 and the second opening 620 are located on the same side of the housing 600 in the width direction, and the first opening 610 and the second opening 620 are located along the length direction of the housing 600 (eg Figure 1 Y direction) are arranged at intervals.

[0185] In this way, when the first opening 610 and the second opening 620 are located on the same side in the width direction of the shell 600, the first opening 610 and the second opening 620 are arranged at intervals along the length direction of the shell 600, so that the first opening 610 and the second opening 620 can be completely staggered in the length direction of the shell 600, avoiding electrical connection and contact between the positive electrode tab 440 extending from the first opening 610 and the negative electrode tab 540 extending from the second opening 620.

[0186] In some embodiments, the housing 600 may be an aluminum-plastic film housing that covers the outer sides of the intermediate electrode assembly 100, the positive electrode lead sheet 400, and the negative electrode lead sheet 500. The aluminum-plastic film can provide an additional mechanical support layer, wrapped around the outside of the electrode sheets, to help fix and stabilize the stacked intermediate electrode sheet 110, the positive electrode lead sheet 400, and the negative electrode lead sheet 500. The aluminum-plastic film housing can reduce the displacement and deformation of the stacked intermediate electrode assembly 100 under external forces.

[0187] The aluminum-plastic film housing is lighter than a metal housing (such as a steel housing or an aluminum housing), which helps to reduce the overall weight of the battery 10 .

[0188] The aluminum-plastic film housing has a certain degree of flexibility, which can better adapt to changes in the internal structure of the battery 10 and reduce damage caused by thermal expansion or mechanical stress.

[0189] refer to Figure 1 , an embodiment of the present application further provides an electrical device, which may include an electrical device and the battery 10 as described above, wherein the battery 10 is used to supply power to the electrical device.

[0190] An embodiment of the present application provides an electrical device. By using the above-mentioned battery 10 to be connected to the electrical device and providing the functions of the electrical device, the space occupancy rate of the battery 10 on the electrical device can be reduced, the space utilization rate of the electrical device can be improved, and the practicality of the electrical device can be improved.

[0191] In some embodiments, the electrical equipment can be a vehicle or an energy storage device. The vehicle can be a new energy vehicle (New Energy Vehicle), such as a pure electric vehicle (Pure Electric Vehicle / Battery Electric Vehicle; abbreviated as: PEV / BEV), a range extended electric vehicle (Range Extended Electric Vehicle; abbreviated as: REEV), a hybrid electric vehicle (Hybrid Electric Vehicle; abbreviated as: HEV), or a fuel cell electric vehicle. The vehicle can also be any vehicle with a battery.

[0192] The various embodiments or implementation methods in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referenced to each other.

[0193] It should be noted that phrases such as "in a specific implementation," "in some embodiments," "in this embodiment," and "exemplarily" mentioned in the specification indicate that the described embodiment may include a particular feature, structure, or characteristic, but not every embodiment necessarily includes that particular feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Furthermore, when a particular feature, structure, or characteristic is described in conjunction with an embodiment, it is within the knowledge of those skilled in the art to implement such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not.

[0194] Generally speaking, terms should be understood, at least in part, based on the context in which they are used. For example, as used herein, the term "one or more" can be used to describe any feature, structure, or characteristic in the singular sense, or can be used to describe a combination of features, structures, or characteristics in the plural sense, depending at least in part on the context. Similarly, terms such as "a," "an," or "the" can also be understood to convey either singular or plural usage, depending at least in part on the context.

[0195] It should be readily understood that “on,” “above,” and “over” in this disclosure should be interpreted in the broadest manner, such that “on” means not only “directly on something,” but also includes “on something” with intervening features or layers therebetween, and “above” or “over” includes not only the meaning of “above” or “over,” but also includes “above” or “over” with no intervening features or layers therebetween (i.e., directly on something).

[0196] Additionally, spatially relative terms, such as "below," "beneath," "beneath," "above," and the like, may be used herein for ease of description to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. The device may be in other orientations (rotated 90 degrees or at other orientations), and the spatially relative descriptors used herein should be interpreted accordingly.

[0197] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been 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 make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery, characterized in that: include: A middle electrode sheet group, comprising a plurality of middle electrode sheets stacked along a first direction, each of the middle electrode sheets comprising a first current collector, a first positive electrode coating, a first negative electrode coating and a first insulating edge; The first positive electrode coating and the first negative electrode coating are respectively coated on two surfaces of the first current collector in a thickness direction; The first insulating edge is coated on the outer periphery of the first current collector, and the first insulating edge is located on the outer periphery of the first positive electrode coating and the first negative electrode coating; The two first insulating edges of two adjacent middle pole pieces are connected.

2. The battery according to claim 1, characterized in that The battery further includes a first separator; The first diaphragm is disposed between each two adjacent first current collectors; There is a first gap between the first insulating edge and the outer edge of the first positive electrode coating; A second interval is provided between the first insulating edge and the outer edge of the first negative electrode coating.

3. The battery according to claim 1, characterized in that The first insulating edge wrapping includes: a first annular portion, disposed on one side surface of the first current collector in a thickness direction, and the first annular portion is spaced apart and disposed on an outer circumference of the first positive electrode coating layer; a second annular portion, provided on the other side surface of the first current collector in the thickness direction, and the second annular portion is provided at intervals on the outer circumference of the first negative electrode coating; The first side portion covers the outer edge of the first current collector, and the first annular portion is connected to the second annular portion through the first side portion.

4. The battery according to claim 3, characterized in that The width of the first annular portion and / or the width of the second annular portion is greater than or equal to 5 mm and less than or equal to 10 mm; And / or, the thickness of the first current collector is greater than or equal to 20 μm and less than or equal to 100 μm.

5. The battery according to any one of claims 1 to 4, characterized in that: The first insulating edge accounts for less than or equal to 20% of the outer surface area of ​​the first current collector.

6. The battery according to any one of claims 1 to 4, characterized in that: The first insulating edge is ceramic insulating coating glue.

7. The battery according to any one of claims 1 to 4, characterized in that: In the first direction, the orthographic projections of the first positive electrode coating and the first negative electrode coating on each of the intermediate electrodes at least partially overlap; Moreover, in the first direction, the orthographic projections of the first positive electrode coatings on two adjacent intermediate electrode sheets at least partially overlap.

8. The battery according to any one of claims 1 to 4, characterized in that: The battery further comprises a positive electrode lead-out sheet and a negative electrode lead-out sheet; Along the first direction, the positive lead sheet is connected to one of the outermost intermediate electrodes, the negative lead sheet is connected to the other outermost intermediate electrode, and the intermediate electrode group is located between the positive lead sheet and the negative lead sheet.

9. The battery according to claim 8, characterized in that The positive electrode lead-out sheet comprises: Second collector; a second positive electrode coating, applied on a side of the second current collector facing the middle electrode assembly; a second insulating edge covering, covering the outer periphery of the second current collector, and the second insulating edge covering is located on the outer periphery of the second positive electrode coating, and the second insulating edge covering is connected to the first insulating edge covering of the outermost middle electrode sheet; A positive electrode tab passes through the second insulating edge and is electrically connected to one end of the second current collector.

10. The battery according to claim 9, characterized in that The negative electrode lead-out sheet comprises: The third set of fluids; a second negative electrode coating, coated on a side of the third current collector facing the middle electrode assembly; a third insulating edge covering, covering the outer periphery of the third current collector, and the third insulating edge covering is located on the outer periphery of the second negative electrode coating, and the third insulating edge covering is connected to the first insulating edge covering of the outermost middle electrode sheet in the middle electrode sheet group; A negative electrode tab passes through the third insulating edge and is electrically connected to one end of the third current collector.

11. The battery according to claim 10, characterized in that The battery further includes a housing; The intermediate electrode assembly, the positive electrode lead-out sheet, and the negative electrode lead-out sheet are all disposed in the housing; The shell is provided with a first opening and a second opening communicating with the interior of the shell, the positive electrode tab passes through the first opening and extends to the outside of the shell, and the negative electrode tab passes through the second opening and extends to the outside of the shell; A portion of the second insulating edge is located in the first opening and seals the first opening, and a portion of the third insulating edge is located in the second opening and seals the second opening.

12. The battery according to claim 11, characterized in that The first opening and the second opening are arranged opposite to each other in the width direction of the housing; Alternatively, the first opening and the second opening are located on the same side of the housing in the width direction, and the first opening and the second opening are arranged at intervals along the length direction of the housing.

13. The battery according to claim 9, characterized in that The battery further includes a second separator; The second diaphragm is disposed between the second current collector and the first current collector; A third interval is provided between the second insulating edge and the outer edge of the second positive electrode coating.

14. The battery according to claim 10, characterized in that Also included is a third diaphragm; The third diaphragm is disposed between the third current collector and the first current collector; A fourth interval is provided between the third insulating edge and the outer edge of the second negative electrode coating.

15. An electrical device, characterized in that: The invention comprises an electric device and a battery according to any one of claims 1 to 14, wherein the battery is used to supply power to the electric device.

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