Battery, charging and discharging module and electronic equipment

Abstract

The utility model discloses a battery, a charging and discharging module and electronic equipment. The battery provided by the utility model comprises a shell, a separator and a battery cell, the separator is arranged in the shell, and the edge of the separator is connected with the shell, so that the shell is divided into a plurality of accommodating cavities; each battery cell is formed by laminating a plurality of pole pieces, and the battery cells are respectively positioned in the accommodating cavities; at least one side of the separator is provided with a first coating part, the first coating part is provided with a first active substance, the pole piece which is positioned on the outermost side of the battery cell and is arranged opposite to the separator is set as a first pole piece, one side, close to the separator, of the first pole piece is provided with a second coating part, and the second coating part is provided with a second active substance; the first active material and the second active material can be subjected to electrochemical reaction. According to the battery, the foil is arranged on the separator and is coated with the active substance, so that electrochemical reaction can be generated between the separator and the battery cell, and the energy density of the battery is further increased.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a battery, a charging and discharging module and an electronic device. Background Art

[0002] For some high-power electronic devices, such as drones, laptops, and cameras, a single battery cell cannot meet their power consumption requirements, and multiple batteries need to be connected in series, parallel, or mixed to achieve the output power required by the device. However, batteries connected in series or parallel will take up a large space and have a low energy density. For this reason, a solution of arranging multiple batteries in the same housing and connecting multiple batteries in series or parallel is widely used.

[0003] Among them, the voltage of the inner series battery is higher than that of a single battery, and when the voltage reaches a limit value, the organic electrolyte will decompose, causing the battery to fail. Therefore, the inner series battery is often divided into multiple independent chambers by separators, and each chamber is used to accommodate battery cells and electrolytes. However, the setting of the separator will occupy the space inside the battery casing, affecting the energy density of the battery. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a battery that can further increase the energy density of the battery by arranging a foil material on the separator and coating an active substance so that the separator can generate an electrochemical reaction with the battery core.

[0005] The utility model also provides a charging and discharging module having the battery.

[0006] The utility model also provides an electronic device having the charging and discharging module.

[0007] A battery according to a first embodiment of the present invention includes:

[0008] case;

[0009] At least one isolating member, the isolating member is disposed in the shell, and an edge of the isolating member is connected to the shell to separate a plurality of accommodating cavities in the shell;

[0010] At least two battery cells, each of which is formed by a plurality of electrode stacks, and each of the battery cells is located in each of the accommodating cavities;

[0011] Among them, a first coating portion is provided on at least one side of the isolation member, and the first coating portion is provided with a first active substance. The pole piece located at the outermost side of the battery cell and arranged opposite to the isolation member is set as the first pole piece. A second coating portion is provided on the side of the first pole piece close to the isolation member, and the second coating portion is provided with a second active substance. The first active substance and the second active substance can undergo an electrochemical reaction.

[0012] The battery according to the embodiment of the utility model has at least the following beneficial effects:

[0013] An isolation member is provided between each cell of the multi-cell battery of the present application to prevent electrolyte decomposition caused by excessive voltage. In addition, an active substance is also provided on the isolation member, which can undergo electrochemical reaction with adjacent electrodes, thereby making full use of the space on the isolation member and improving the energy density of the battery.

[0014] According to some embodiments of the present invention, the isolation member includes an isolation layer and foil layers respectively arranged on both sides of the isolation layer, and the first coating portion is arranged on two opposite sides of the two foil layers;

[0015] Wherein, the second coating portion is provided on both of the two first pole pieces located on both sides of the isolation member and arranged opposite to the isolation member.

[0016] According to some embodiments of the present invention, the two battery cells located on both sides of the same separator are respectively set as the first battery cell and the second battery cell, the foil layer adjacent to the first battery cell is set as the first foil layer, and the foil layer adjacent to the second battery cell is set as the second foil layer;

[0017] Wherein, the cathode ear of the first battery cell is electrically connected to the first foil layer, and the cathode ear of the second battery cell is electrically connected to the second foil layer;

[0018] Alternatively, the anode lug of the first battery cell is electrically connected to the first foil layer, and the anode lug of the second battery cell is electrically connected to the second foil layer.

[0019] According to some embodiments of the present utility model, the isolating member further comprises a packaging portion made of insulating material, the packaging portion is located at an edge of the isolating member and is used to abut against the housing;

[0020] Wherein, the isolation member comprises an isolation layer and foil layers respectively arranged on both sides of the isolation layer, each of the foil layers is provided with the first coating portion and the packaging portion, and the packaging portion is arranged around the first coating portion;

[0021] Alternatively, the isolation member includes an isolation layer and foil layers respectively arranged on both sides of the isolation layer, each of the foil layers is provided with the first coating portion, and the packaging portions are further provided on both sides of the isolation layer, and the packaging portions are arranged around the foil layers.

[0022] According to some embodiments of the present invention, when the isolation member includes an isolation layer and foil layers respectively arranged on both sides of the isolation layer, each of the foil layers is provided with the first coating portion and the packaging portion, and the packaging portion is arranged around the first coating portion, an avoidance groove is provided on the packaging portion, and the avoidance groove is used to expose the foil layer below the packaging portion;

[0023] Among them, one of the pole tabs of the battery cell is inserted into the avoidance groove and connected to the foil layer, and the other pole tab is in contact with the packaging part.

[0024] According to some embodiments of the present invention, when the isolation member includes an isolation layer and foil layers respectively arranged on both sides of the isolation layer, the first coating portion is arranged on the foil layer, and the packaging portion is arranged on the foil layer and surrounds the first coating portion, an avoidance groove is arranged on the packaging portion, and the avoidance groove is used to expose the foil layer below the packaging portion;

[0025] The avoidance groove is filled with a conductive part, one of the pole ears of the battery cell is connected to the conductive part so as to be electrically connected to the foil layer through the conductive part, and the other pole ear is in contact with the packaging part.

[0026] According to some embodiments of the present invention, along the projection of the thickness direction of the battery, the projection areas of the first coating portion and the second coating portion overlap.

[0027] According to some embodiments of the utility model, the battery includes one insulating member and two battery cells, and the pole piece located at the outermost side of the battery cell and arranged opposite to the shell is set as the second pole piece, the first pole piece is coated on both sides, and the second pole piece is coated on one side.

[0028] The charging and discharging module according to the second aspect of the present invention comprises a circuit board and a battery as described in any one of the above embodiments, wherein the battery cells in the battery are respectively electrically connected to the circuit board so that the battery cells are connected in series or in parallel.

[0029] An electronic device according to an embodiment of the third aspect of the utility model comprises the charging and discharging module described in any one of the above embodiments.

[0030] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The present invention is further described below with reference to the accompanying drawings and embodiments, wherein:

[0032] Figure 1 This is a schematic diagram of the structure of a battery before packaging according to an embodiment of the utility model;

[0033] Figure 2 A top view of a battery cell placed on an isolating member according to an embodiment of the utility model;

[0034] Figure 3 for Figure 2 A schematic cross-sectional view of the middle isolator along the AA direction;

[0035] Figure 4 for Figure 2 A schematic cross-sectional view of the middle isolator along the BB direction;

[0036] Figure 5 for Figure 2 A schematic cross-sectional view of another embodiment of the isolating member along the BB direction;

[0037] Figure 6 It is a top view of the isolation member according to an embodiment of the utility model.

[0038] Reference numerals:

[0039] Housing 100;

[0040] Isolation member 200; isolation layer 210; foil layer 220; first foil layer 221; second foil layer 222; first coating portion 230; packaging portion 240; avoidance groove 241; conductive portion 250;

[0041] Battery cell 300; pole ear 310; cathode ear 301; anode ear 302;

[0042] Diaphragm 400. DETAILED DESCRIPTION

[0043] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0044] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0045] In the description of the present utility model, "several" means more than one, "many" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used to distinguish the technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0046] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0047] In the description of the utility model, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0048] For some high-power electronic devices, such as drones, laptops, and cameras, a single battery cell cannot meet their power consumption requirements, and multiple batteries need to be connected in series, parallel, or mixed to achieve the output power required by the device. However, batteries connected in series or parallel will take up a large space and have a low energy density. For this reason, a solution of arranging multiple batteries in the same housing and connecting multiple batteries in series or parallel is widely used.

[0049] Among them, the voltage of the inner series battery is higher than that of a single battery, and when the voltage reaches a limit value, the organic electrolyte will decompose, causing the battery to fail. Therefore, the inner series battery is often divided into multiple independent chambers by separators, and each chamber is used to accommodate battery cells and electrolytes. However, the setting of the separator will occupy the space inside the battery casing, affecting the energy density of the battery.

[0050] In response to the above problems, the present application arranges a foil on the isolation member 200 and coats the active material so that the isolation member 200 can produce an electrochemical reaction with the battery cell 300, thereby fully utilizing the surface space of the isolation member 200, improving the space utilization rate within the battery, and further increasing the energy density of the battery.

[0051] Specifically, the first embodiment of the present application provides a battery, which includes a housing 100, at least one isolating member 200 and at least two battery cells 300. The housing 100 can be made of a hard material such as a steel shell or an aluminum shell, or a soft material such as an aluminum-plastic film. The isolating member 200 is disposed in the housing 100. Figure 1 In the embodiment shown, two grooves for accommodating the battery cell 300 are punched out on the upper side and the lower side of the shell 100, respectively. The first battery cell 300 is placed in the groove of the lower shell 100, and then the separator 200 is laid flat on the shell 100, and then the second battery cell 300 is placed on the separator 200. Finally, the shell 100 is folded so that the groove of the upper shell 100 can cover the second battery cell 300, and the shell 100 and the separator 200 are subjected to edge sealing processes such as hot melt pressing, so that the shell 100 and the separator 200 are connected to form an integral structure. The edges of the separator 200 are all clamped by the upper shell 100 and the lower shell 100, so that the separator 200 respectively closes the openings of the grooves on the upper and lower shells 100 to separate two accommodating cavities in the shell 100.

[0052] In other embodiments (not shown in the figure), the housing 100 is an aluminum-plastic film, which wraps N battery cells 300 and N-1 separators 200, where N is a positive integer greater than or equal to 2, and the battery cells 300 and the separators 200 are alternately arranged. Then, the aluminum-plastic film and the separators 200 are hot-melt pressed together to form an integral structure, and the separators 200 divide the chamber in the aluminum-plastic film into N accommodating cavities, each of which is provided with a battery cell 300.

[0053] It should be noted that in the embodiment of the present application, the battery cell 300 is a laminated battery cell 300, that is, the battery cell 300 includes a plurality of stacked pole pieces, the pole ears of each pole piece are stacked together to form a pole ear portion, and the pole ear portion is welded to the pole ear 310 of the battery cell 300, and the pole ear 310 of the battery cell 300 is used to lead the current of each pole piece. Figure 1 As shown, the tab 310 of the battery cell 300 is inserted between the isolating member 200 and the housing 100 , and extends out of the housing 100 .

[0054] For the convenience of subsequent understanding, the outermost electrode of the battery cell 300 and arranged opposite to the first coating portion 230 is set as the first electrode, and the outermost electrode of the battery cell 300 and arranged opposite to the housing 100 is set as the second electrode. Figure 1 In the embodiment shown, the housing 100 includes two battery cells 300 (one of the battery cells 300 is located at the lower side of the separator 200), the two battery cells 300 are located at both sides of the separator 200, and each electrode is arranged parallel to the separator 200. For a single battery cell 300, one side of the battery cell 300 is close to the separator 200, and the other side is close to the housing 100, that is, in the case Figure 1 In the battery of the dual-cell 300 shown, each cell 300 has a first pole piece, a second pole piece, and several other pole pieces located between the first pole piece and the second pole piece. It is understandable that in the battery structure of three or more cells 300, the two cells 300 located on the relatively outer sides have a first pole piece, a second pole piece, and several other pole pieces located between the first pole piece and the second pole piece, and the several cells 300 located on the relatively inner sides have two first pole pieces and several other pole pieces located between the two first pole pieces.

[0055] A first coating portion 230 is provided on at least one side of the separator 200, and a first active material is coated on the first coating portion 230. A second coating portion is provided on the first pole piece that is arranged opposite to the side of the separator 200 on which the first coating portion 230 is provided, and the second coating portion is arranged on the side of the first pole piece that is close to the separator 200 (that is, the first coating portion 230). The second coating portion is coated with a second active material. It should be noted that the first active material and the second active material are materials of different polarities, and can undergo electrochemical reactions after being immersed in the electrolyte to generate electrical energy.

[0056] In a battery, the first active material and the second active material are coated on pole pieces of different polarities. For example, if the first active material is graphite, it is often coated on the anode pole piece, and if the second active material is lithium cobalt oxide, lithium iron phosphate, etc., it is often coated on the cathode pole piece. In the present application, if the first pole piece is an anode pole piece, the separator 200 is coated with a cathode material, and if the first pole piece is a cathode pole piece, the separator 200 is coated with an anode material.

[0057] It should be understood that, in some embodiments, the first coating portion 230 is disposed on one side of the separator 200, so that the separator 200 can undergo an electrochemical reaction with the battery cell 300 on one side, thereby improving the energy density of the battery. Figures 3 to 5 As shown, the first coating portion 230 may be provided on both sides of the separator 200 , so that the separator 200 can undergo electrochemical reaction with the battery cells 300 on both sides, further improving the energy density of the battery.

[0058] In the multi-cell battery of the related art, the separator 200 is often made of an insulating material, or the separator 200 is a multi-layer sandwich structure, at least the outermost layer is an insulating layer. For example, in some prior arts, the separator 200 adopts a PP layer-aluminum layer-PP layer structure to separate the electrolyte in the two accommodating chambers. The PP layer of this structure is not suitable for coating, so the first pole piece of the battery cell 300 adjacent to the separator 200 is often a single-sided piece, that is, the first pole piece is coated on one side away from the separator 200 to perform an electrochemical reaction with the corresponding pole piece, and the first pole piece is not coated on the side close to the separator 200 to avoid wasting active substances. In the present application, the first pole piece is coated on both sides, and can undergo electrochemical reactions with the adjacent pole piece and the adjacent separator 200 respectively.

[0059] Based on the above, an isolation member 200 is provided between each battery cell 300 of the multi-cell 300 battery of the present application to prevent electrolyte decomposition caused by excessive voltage, and active substances are also provided on the isolation member 200, which can undergo electrochemical reactions with adjacent electrodes, thereby making full use of the space on the isolation member 200 and improving the energy density of the battery.

[0060] In some embodiments, Figures 3 to 5 As shown, both sides of the separator 200 are provided with a first coating portion 230. Specifically, in order to realize the collection and transmission of electric energy, the first coating portion 230 needs to be provided on a metal foil. If the first active substance is a cathode material, the foil is often an aluminum foil. If the first active substance is a cathode material, the foil is often a copper foil. Thus, the separator 200 includes an isolation layer 210 and two foil layers 220. The two foil layers 220 are respectively provided on both sides of the isolation layer 210 and connected to the isolation layer 210. The isolation layer 210 is made of an insulating material and is not conductive. Its commonly used materials include PP (polypropylene) and the like. The first coating portion 230 is provided on both foil layers 220, and the two first coating portions 230 are provided on two opposite sides of the two foil layers 220, that is, provided on the side of the foil layer 220 away from the isolation layer 210. Correspondingly, the second coating portion is disposed on the first pole pieces of the battery cells 300 on both sides opposite to the isolation member 200 .

[0061] Furthermore, to facilitate subsequent description, the two battery cells 300 on both sides of the same isolation member 200 are respectively set as the first battery cell and the second battery cell, and the foil layer 220 adjacent to the first battery cell on the isolation member 200 is set as the first foil layer 221, and the foil layer 220 adjacent to the second battery cell is set as the second foil layer 222.

[0062] Wherein, if the first foil layer 221 and the second foil layer 222 are of cathode polarity, the cathode ear 301 of the first battery cell is electrically connected to the first foil layer 221, and the cathode ear 301 of the second battery cell is electrically connected to the second foil layer 222. It should be noted that the cathode ear 301 of the first battery cell is connected to the current collector of each cathode sheet, so as to collect the current on each cathode sheet for extraction. After the cathode ear 301 of the first battery cell is connected to the first foil layer 221, it is used to collect the current of the first foil layer 221 on the separator 200 and the current on the cathode sheet of the first battery cell and then extract them together. The cathode ear 301 of the second battery cell is used to collect the current of the second foil layer 222 and the current on the cathode sheet of the second battery cell and then extract them together. It should be noted that the first foil layer 221 and the second foil layer 222 are not directly connected, and the cathode ear 301 of the first battery cell and the cathode ear 301 of the second battery cell can be connected in series by being connected to an external circuit.

[0063] In such Figures 3 to 5 In the illustrated embodiment, the first foil layer 221 and the second foil layer 222 are both made of aluminum foil, which are connected by an isolation layer 210, and the isolation layer 210 is a PP material, thereby forming an aluminum layer-PP layer-aluminum layer structure, which can be coated on the outermost aluminum layer.

[0064] On the contrary, if the first foil layer 221 and the second foil layer 222 are of anode polarity, the anode ear 302 of the first battery cell is electrically connected to the first foil layer 221, and the anode ear 302 of the second battery cell is electrically connected to the second foil layer 222, so that the anode ear 302 of the first battery cell is used to conduct current to the first foil layer 221 and the anode sheet of the first battery cell, and the same applies to the anode ear 302 of the second battery cell.

[0065] It should be noted that the electrical connection described here means that current transmission can be achieved between the foil layer 220 on the separator 200 and the tab 310 of the battery cell 300, but does not limit the specific connection relationship. For example, the tab 310 of the first battery cell and the first foil layer 221 can be connected by an external wire, a connecting sheet, etc., or can be connected by a Figure 1 The tab 310 of the first battery cell is directly welded to the foil layer 220 .

[0066] In some embodiments, Figure 2 and Figure 6 As shown, it needs to be explained that Figure 2 It is a top view of the battery cell 300 after being placed on the isolation member 200. Figure 62 is a top view of the isolating member 200. The isolating member 200 also includes a packaging portion 240, which is located at the edge of the isolating member 200 and is used to abut against the shell 100. The packaging portion 240 is made of an insulating material and is not conductive. Commonly used materials include PP (polypropylene) and the like. The packaging portion 240 is attached to the edge of the isolating member 200. On the one hand, it can prevent the shell 100 from being charged due to direct contact between the foil of the shell 100 and the isolating member 200. On the other hand, it can be hot-melted during packaging to connect with the shell 100.

[0067] Furthermore, in some embodiments, the packaging portion 240 is disposed on the foil layer 220, such as Figures 3 to 6 As shown, the first coating portion 230 and the packaging portion 240 are disposed on both foil layers 220 of the isolation member 200, and the packaging portion 240 is disposed around the first coating portion 230. Alternatively, in some other embodiments (not shown in the figure), the packaging portion 240 is disposed on the isolation layer 210, so that the packaging portion 240 is disposed around the foil layer 220.

[0068] like Figure 4 As shown, the packaging part 240 is also provided with an avoidance groove 241, and the avoidance groove 241 is used to expose the foil layer 220 below the packaging part 240. Thus, the pole ear 310 on the battery cell 300 with the same polarity as the foil layer 220 can be inserted into the avoidance groove 241, and connected to the foil layer 220 by welding or the like, so as to realize the electrical connection between the pole ear 310 and the foil layer 220. In addition, after the battery cell 300 and the separator 200 are connected as an integral structure, the battery cell 300 can be effectively prevented from shaking in the accommodating cavity, thereby improving the safety performance of the battery. In addition, it should be noted that the pole ear 310 of the battery cell 300 with the opposite polarity to the foil layer 220 is not connected to the foil layer 220, but abuts against the packaging part 240 to avoid short circuit.

[0069] As Figure 4 The embodiment shown is specifically described. If the first active materials on the separator 200 are all cathode materials and the foil layer 220 are all aluminum foil, the first pole piece is a double-sided coated anode piece, and the first pole piece and the separator 200 are separated by the diaphragm 400, and the transmission of lithium ions is achieved through the diaphragm 400. The avoidance groove 241 on the separator 200 is set corresponding to the cathode ear 301 of the first battery cell. When the first battery cell is fitted with the separator 200, the cathode ear 301 is bent downward so that the cathode ear 301 passes through the avoidance groove 241 and abuts against the first foil layer 221, so that the cathode ear 301 is welded to the first foil layer 221, and then the cathode ear 301 is bent upward to maintain the same plane as the anode ear 302 and the cathode ear 301 continues to extend outside the shell 100, and the second battery cell on the other side is also the same.

[0070] The anode ear 302 of the first cell and the second cell is not welded to the first foil layer 221. The anode ear 302 is inserted between the shell 100 and the separator 200 and extends out of the shell 100. When the shell 100 and the separator 200 are packaged, the two sides of the anode ear 302 are respectively in contact with the packaging part 240 of the shell 100 and the separator 200, and are clamped and fixed between the shell 100 and the separator 200. Figure 1 and Figure 2 As shown, the first battery cell and the second battery cell are rotationally symmetrically arranged, that is, the tabs 310 of the first battery cell and the second battery cell are symmetrically arranged along their central axis, so that after the battery is packaged, four tabs 310 extend from the shell 100 .

[0071] In other embodiments, Figure 2 , Figure 5 and Figure 6 As shown, an avoidance groove 241 is provided on the packaging part 240. A conductive part 250 is provided in the avoidance groove 241, and the lower end of the conductive part 250 is connected to the foil layer 220, and the upper end is flush with the packaging part 240, so that the pole ear 310 of the battery cell 300 can be electrically connected to the foil layer 220 through the conductive part 250. Taking the connection between the cathode ear 301 and the conductive part 250 as an example, after the battery cell 300 is placed on the separator 200, the cathode ear 301 and the anode ear 302 of the battery cell 300 are bent downward, and then attached to the upper surface of the separator 200 and extend out of the shell 100. At this time, the cathode ear 301 contacts the upper surface of the conductive part 250 to facilitate the welding of the cathode ear 301 and the conductive part 250. At this time, the cathode ear 301 and the anode ear 302 are in the same plane, and there is no need to bend the cathode ear 301 again. The anode ear 302 contacts the upper surface of the packaging portion 240 to avoid an electrical short circuit between the anode ear 302 and the foil layer 220 .

[0072] It is understood that the conductive part 250 can be stamped integrally with the foil layer 220, that is, the thickness of the foil at the conductive part 250 is greater than the thickness of the foil at other places, so that the foil at the conductive part 250 protrudes from the foil at other places. Alternatively, the conductive part 250 can also be manufactured separately and then connected to the foil layer 220 by welding or the like. The material of the conductive part 250 can be consistent with the material of the foil layer 220, or it can be other conductive metal materials.

[0073] It can be understood that the projection along the thickness direction of the battery, that is, the projection along the plane direction perpendicular to any pole piece, the projection area of ​​the first coating part 230 and the second coating part overlap, that is, the first coating part 230 and the second coating part have equal areas and consistent shapes to improve their electrochemical reaction efficiency. In the embodiment of the present application, in addition to the consistent coating size, the first coating part 230 and the second coating part have the same surface density, compaction density, etc.

[0074] Furthermore, in some embodiments, the first battery cell, the second battery cell, and the separator 200 can be stacked and hot-pressed together to ensure that the first battery cell, the second battery cell, and the separator 200 are tightly fitted together to form a whole, which can not only improve the energy density of the battery cell, but also prevent the first battery cell and the second battery cell from being misaligned. In other embodiments, the first battery cell and the second battery cell are stacked separately and then hot-pressed together with the separator 200. It should be noted that the present application does not limit the hot-pressing process of stacking, and it is sufficient to enable the first battery cell, the second battery cell, and the separator 200 to fit tightly together to form a whole.

[0075] Based on the aforementioned second pole piece, it should be noted that the second pole piece is provided with a second coating portion on one side, the second pole piece is often a cathode piece, the second pole piece is coated on one side, and its coating area is provided on the side of the second pole piece away from the shell 100.

[0076] The embodiment of the second aspect of the present application provides a charging and discharging module, which includes a circuit board and a battery mentioned in any of the above embodiments, and the battery cells 300 in the battery are electrically connected to the circuit board respectively, for example, Figure 1 The four extended pole ears 310 are respectively connected to the soldering points on the circuit board, wherein the two cathode ears 301 are soldered to the same soldering point so that the two battery cells 300 are externally connected in series through the circuit board. Alternatively, in other embodiments, the battery cells 300 and the circuit board are connected in parallel through an external circuit.

[0077] An embodiment of the third aspect of the present application proposes an electronic device, which includes the charging and discharging module described in the above embodiment. The electronic device may be a drone, a laptop computer, a camera, etc., which has high requirements on battery output power and battery energy density. The battery of the embodiment of the first aspect of the present application can better meet its needs.

[0078] The embodiments of the utility model are described in detail above in conjunction with the accompanying drawings, but the utility model is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in the relevant technical field without departing from the purpose of the utility model. In addition, the embodiments of the utility model and the features in the embodiments can be combined with each other without conflict.

Claims

1. A battery, characterized in that include: case; At least one isolating member, the isolating member is disposed in the shell, and an edge of the isolating member is connected to the shell to separate a plurality of accommodating cavities in the shell; At least two battery cells, each of which is formed by a plurality of electrode stacks, and each of the battery cells is located in each of the accommodating cavities; Among them, a first coating portion is provided on at least one side of the isolation member, and the first coating portion is provided with a first active substance. The pole piece located at the outermost side of the battery cell and arranged opposite to the isolation member is set as the first pole piece. A second coating portion is provided on the side of the first pole piece close to the isolation member, and the second coating portion is provided with a second active substance. The first active substance and the second active substance can undergo an electrochemical reaction.

2. The battery according to claim 1, characterized in that The isolating member comprises an isolating layer and foil layers respectively arranged on both sides of the isolating layer, and the first coating portion is arranged on two opposite sides of the two foil layers; Wherein, the second coating portion is provided on both of the two first pole pieces located on both sides of the isolation member and arranged opposite to the isolation member.

3. The battery according to claim 2, characterized in that The two battery cells located on both sides of the same separator are respectively set as a first battery cell and a second battery cell, the foil layer adjacent to the first battery cell is set as a first foil layer, and the foil layer adjacent to the second battery cell is set as a second foil layer; Wherein, the cathode ear of the first battery cell is electrically connected to the first foil layer, and the cathode ear of the second battery cell is electrically connected to the second foil layer; Alternatively, the anode lug of the first battery cell is electrically connected to the first foil layer, and the anode lug of the second battery cell is electrically connected to the second foil layer.

4. The battery according to claim 1, characterized in that The isolating member further comprises a packaging portion made of insulating material, the packaging portion being located at an edge of the isolating member and being used for abutting against the housing; Wherein, the isolation member comprises an isolation layer and foil layers respectively arranged on both sides of the isolation layer, each of the foil layers is provided with the first coating portion and the packaging portion, and the packaging portion is arranged around the first coating portion; Alternatively, the isolation member includes an isolation layer and foil layers respectively arranged on both sides of the isolation layer, each of the foil layers is provided with the first coating portion, and the packaging portions are further provided on both sides of the isolation layer, and the packaging portions are arranged around the foil layers.

5. The battery according to claim 4, characterized in that When the isolating member includes an isolating layer and foil layers respectively arranged on both sides of the isolating layer, each of the foil layers is provided with the first coating portion and the packaging portion, and the packaging portion is arranged around the first coating portion, an avoidance groove is provided on the packaging portion, and the avoidance groove is used to expose the foil layer below the packaging portion; Among them, one of the pole tabs of the battery cell is inserted into the avoidance groove and connected to the foil layer, and the other pole tab is in contact with the packaging part.

6. The battery according to claim 4, characterized in that When the isolating member includes an isolating layer and foil layers respectively arranged on both sides of the isolating layer, the first coating portion is arranged on the foil layer, the packaging portion is arranged on the foil layer and surrounds the first coating portion, an avoidance groove is arranged on the packaging portion, and the avoidance groove is used to expose the foil layer below the packaging portion; The avoidance groove is filled with a conductive part, one of the pole ears of the battery cell is connected to the conductive part so as to be electrically connected to the foil layer through the conductive part, and the other pole ear is in contact with the packaging part.

7. The battery according to claim 1, characterized in that Along the projection in the thickness direction of the battery, the projection areas of the first coating portion and the second coating portion overlap.

8. The battery according to claim 1, characterized in that The battery includes one isolating member and two battery cells. The pole piece located at the outermost side of the battery cell and arranged opposite to the shell is set as the second pole piece. The first pole piece is coated on both sides, and the second pole piece is coated on one side.

9. A charging and discharging module, characterized in that: include: Circuit boards; The battery according to any one of claims 1 to 8, wherein the battery cells in the battery are respectively electrically connected to the circuit board so that the battery cells are connected in series or in parallel.

10. An electronic device, characterized in that Comprising the charging and discharging module as described in claim 9.

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