Battery monomer, battery device and electric device

Abstract

The utility model discloses a battery monomer, battery device and power utilization device, the battery monomer includes: shell and electrode subassembly, electrode subassembly includes electrode main part and tab portion, the tab portion is connected to the end portion of electrode main part along the first direction, the tab portion includes a plurality of superposing tab piece, the tab piece is in the first direction. The plurality of tab pieces in the tab part comprise a first tab piece, a second tab piece and at least one third tab piece, and the third tab piece is positioned between the first tab piece and the second tab piece; wherein the surface, deviating from the third tab piece, of the first tab piece is a first surface, the surface, deviating from the third tab piece, of the second tab piece is a second surface, the first surface and the second surface form at least part of the outer surface of the tab part, and at least part of the first surface faces the electrode main body; a first insulating layer is arranged on the part, facing the electrode main body, in the first surface; and the whole surface of each third tab piece is a conductive surface. According to the battery monomer provided by the utility model, the volume energy density of the battery monomer is favorably improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially is related to a battery monomer, battery device and electric device. BACKGROUND

[0002] The electrode assembly of the battery monomer includes the electrode main body and the tab part connected, and the insulating layer is formed on the tab part to avoid short circuit or other electrical faults of the battery monomer. In the related art, the overall thickness of the tab part of the electrode assembly is large, which leads to that the tab part needs to occupy a large space in the shell of the battery monomer, and thus the volumetric energy density of the battery monomer is low. SUMMARY

[0003] In view of the above problems, the battery monomer, the battery device and the electric device are provided, which are beneficial to improve the volumetric energy density of the battery monomer.

[0004] In the first aspect, the utility model provides a kind of battery monomer, comprising: shell, with accommodating cavity;Electrode assembly, is located in the accommodating cavity and includes electrode main body and tab part, the tab part is connected in the end of the electrode main body along first direction, the tab part includes multiple tab pieces of superposition, multiple the tab piece in the tab part includes first tab piece, second tab piece and at least one third tab piece, the third tab piece is between the first tab piece and the second tab piece;Wherein, the surface of the first tab piece away from the third tab piece is first surface, the surface of the second tab piece away from the third tab piece is second surface, the first surface and the second surface constitute at least part of outer surface of the tab part, at least part of the first surface is towards the electrode main body, the part of the first surface towards the electrode main body is provided with first insulating layer, the entire surface of each third tab piece is conductive surface.

[0005] In the above technical solution, by making the part of the first surface of the first tab piece towards the electrode main body be provided with the first insulating layer, so that the first insulating layer can form effective insulation effect between the tab part and the electrode main body, and the first insulating layer can effectively avoid the tab part from being short-circuited due to accidental contact with the electrode main body or other conductive components during the assembly or use of the battery monomer;In addition, by making the entire surface of each third tab piece be conductive surface, so that the surface of the third tab piece is not coated with the first insulating layer, which is beneficial to reduce the overall thickness of the tab part and the space occupied by the tab part in the shell, and thus is beneficial to improve the volumetric energy density of the battery monomer.

[0006] In some embodiments, the first insulating layer is an insulating adhesive layer.

[0007] In the technical solution, the first insulating layer is an insulating adhesive layer, which has good flexibility and can maintain its insulating performance when being bent or slightly deformed. The insulating adhesive layer has good adhesion with the first tab, so that it can be closely attached to the first surface and provide uniform and reliable insulation effect. In addition, the insulating adhesive layer can be quickly formed on the first electrode tab by coating or spraying, which is simple to operate and suitable for mass production.

[0008] In some embodiments, the first insulating layer is a UV adhesive layer.

[0009] In the technical solution, the first insulating layer is a UV adhesive layer. The UV adhesive is a light-cured adhesive that can be quickly cured by light irradiation, which helps to improve production efficiency. The UV adhesive layer has excellent insulation, which helps to further improve the insulation protection effect of the first insulating layer. In addition, the UV adhesive layer has good adhesion with the tab and good flexibility.

[0010] In some embodiments, the projection of the third tab on a reference plane is located within the projection of the first tab on the reference plane, and the reference plane is a plane perpendicular to the first direction.

[0011] In the technical solution, the projection of the third tab on the reference plane is located within the projection of the first tab on the reference plane. In the battery cell, the first tab can wrap the third tab, so that the first insulating layer can form an effective insulation between the entire tab and the electrode body, avoiding the electrode body contacting the conductive surface of the third tab and causing short circuit and other electrical faults.

[0012] In some embodiments, the electrode body includes a tab body, an active material layer disposed on the tab body, and a second insulating layer. The second insulating layer is located on the side of the active material layer adjacent to the tab portion along the first direction, and the second insulating layer is located on the edge portion of the tab body along the first direction. The first insulating layer extends to the root of the first tab.

[0013] In the technical solution, the second insulating layer is provided on the edge portion of the tab body along the first direction. This helps to avoid the distortion and wrinkles of the tab and reduces or avoids the generation of excessive burrs and other defects during the die cutting process of the tab. In addition, the insulating layer also plays an insulating role in the electrode body, which helps to improve the safety performance of the battery cell.

[0014] In some embodiments, in the first direction, the first insulating layer and the second insulating layer are adjacent; or the first insulating layer and the second insulating layer have a first overlapping region, and the size of the first overlapping region along the first direction is less than or equal to 1 mm.

[0015] In the technical solution, the first insulating layer and the second insulating layer are adjacent or have the first overlapping region, so as to avoid the area without the insulating material between the first insulating layer and the second insulating layer and the short circuit risk caused thereby, further improve the reliability of the insulation protection of the first insulating layer and the second insulating layer, and improve the safety performance of the battery cell; the size of the first overlapping region along the first direction is less than or equal to 1 mm, which can reduce or avoid the waste of the insulating material under the premise of ensuring the insulation effect.

[0016] In some embodiments, in the first direction, the active material layer and the second insulating layer are adjacent; or, the active material layer and the second insulating layer have a second overlapping region, and the size of the second overlapping region along the first direction is less than or equal to 0.5 mm.

[0017] In the technical solution, the active material layer and the second insulating layer are adjacent or have the second overlapping region, which is conducive to improving the reliability of the insulation protection of the second insulating layer; the size of the second overlapping region along the first direction is less than or equal to 0.5 mm, which can reduce or avoid the waste of the insulating material under the premise of ensuring the insulation effect.

[0018] In some embodiments, the first insulating layer and the second insulating layer are respectively independently formed; and / or, the first insulating layer and the second insulating layer are respectively insulating layers formed by different insulating materials.

[0019] In the technical solution, the first insulating layer and the second insulating layer are respectively independently formed, so that the first insulating layer and the second insulating layer can each flexibly select a suitable insulating material and process, and the coverage areas of the first insulating layer and the second insulating layer can be flexibly designed and adjusted, and the processing sequence of the first insulating layer and the second insulating layer can be flexibly adjusted.

[0020] In some embodiments, the first insulating layer and the second insulating layer are respectively insulating layers formed by different insulating materials.

[0021] In the technical solution, the first insulating layer and the second insulating layer are respectively insulating layers formed by different insulating materials, so that in the production process of the battery cell, a suitable insulating material and a suitable process can be selected according to the setting area and function of the first insulating layer and the second insulating layer, so as to optimize the performance and production process of the battery cell.

[0022] In some embodiments, the second insulating layer is a metal oxide layer.

[0023] In the technical scheme, the second insulating layer is a metal oxide layer, which is beneficial to strengthen the infiltration effect of the electrolyte in the battery monomer on the pole piece body, and the metal oxide layer has excellent insulation performance, high temperature resistance and chemical stability, thereby being beneficial to improve the performance of the battery monomer.

[0024] In some embodiments, the second surface is provided with a third insulating layer.

[0025] In the technical scheme, the second surface also constitutes at least part of the outer surface of the tab part, so that the second surface also has a risk of causing electrical faults such as short circuit, and the third insulating layer is beneficial to avoid contact between the second tab piece and other conductive components to cause electrical faults such as short circuit, thereby being beneficial to further improve the insulation protection performance of the tab part and improve the performance of the battery monomer.

[0026] In some embodiments, the third insulating layer and the first insulating layer are made of the same insulating material.

[0027] In the technical scheme, the third insulating layer and the first insulating layer are made of the same insulating material, which is beneficial to simplify the processing and production process of the electrode assembly, thereby being beneficial to improve the production efficiency of the battery monomer.

[0028] In some embodiments, the tab part has a bending structure, and in a direction from a root of the tab part to a free end of the tab part, the tab part includes a plurality of bending parts connected in sequence, the plurality of bending parts are arranged in the first direction, and the first insulating layer is arranged on the bending part closest to the electrode body in the first direction.

[0029] In the technical scheme, the tab part has a bending structure, which is beneficial to improve the structural strength of the tab part, and the first insulating layer is arranged on the bending part closest to the electrode body, which can effectively avoid the tab part from accidentally contacting the electrode body during assembly or use to cause electrical faults such as short circuit, thereby improving the reliability of electrical connection.

[0030] In a second aspect, the utility model provides a kind of battery device, comprising: battery box, with installation cavity;Battery monomer assembly is located in the installation cavity and includes multiple battery monomers, and the battery monomer is the battery monomer of the first aspect of the utility model.

[0031] In the technical scheme, the battery box supports and protects the plurality of battery monomers, and by arranging the above battery monomer, it is beneficial to reduce or avoid electrical faults such as short circuit of the battery device, improve the safety performance of the battery device, and also beneficial to improve the volume energy density of the battery device.

[0032] In a third aspect, the utility model provides a kind of electric device, comprising: the battery device according to the second aspect of the utility model.

[0033] In the above technical solution, by setting the battery device, the battery device is set by the above-mentioned battery monomer, which is beneficial to reduce or avoid short circuit and other electrical faults of the battery device, improve the safety performance of the battery device, and also beneficial to improve the volumetric energy density of the battery device, thereby beneficial to improve the performance of the electric device.

[0034] Additional aspects and advantages of the utility model will be partially given in the following description, some will become obvious from the following description, or be understood by the practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0035] The above and / or additional aspects and advantages of the utility model will become apparent and easy to understand from the description of embodiments in conjunction with the following drawings, in which:

[0036] Figure 1 It is the schematic diagram of the battery monomer according to some embodiments of the utility model;

[0037] Figure 2 It is the schematic diagram of the electrode assembly according to some embodiments of the utility model;

[0038] Figure 3 It is Figure 2 The schematic diagram of the tab portion in it;

[0039] Figure 4 It is Figure 2 The schematic diagram of the partial structure of the electrode assembly in it;

[0040] Figure 5 It is Figure 2 The schematic diagram of another partial structure of the electrode assembly in it;

[0041] Figure 6 It is the schematic diagram of the tab body according to some embodiments of the utility model;

[0042] Figure 7 It is the schematic diagram of the partial structure of the electrode assembly according to some embodiments of the utility model;

[0043] Figure 8 It is the side view of the electrode assembly according to some embodiments of the utility model;

[0044] Figure 9 It is the schematic diagram of the battery device according to some embodiments of the utility model;

[0045] Figure 10 It is the schematic diagram of the electric device according to some embodiments of the utility model.

[0046] Reference signs:

[0047] 100, battery cell;

[0048] 10, electrode assembly; 20, case;

[0049] 1, electrode body; 11, tab body; 12, active material layer; 13, second insulating layer;

[0050] 2, tab portion; 21, first tab; 211, first surface; 22, second tab; 221, second surface; 23, third tab; 24, bent portion;

[0051] 3, first insulating layer;

[0052] 200, battery device;

[0053] 1000, power consuming device. DETAILED DESCRIPTION

[0054] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without making creative efforts fall within the scope of protection of the present application.

[0055] Unless otherwise defined, all the technical and scientific terms used in the present application have the same meanings as those commonly understood by those skilled in the art to which the present application belongs; the terms used in the specification of the present application are only for the purpose of describing the specific embodiments of the present application, and are not intended to limit the present application; the terms “include” and “have” in the specification and claims of the present application and the above description of drawings are intended to cover the non-exclusive inclusion. The terms “first”, “second” and the like in the specification and claims of the present application or the above description of drawings are used to distinguish different objects, and are not intended to describe a specific order or primary and secondary relationship.

[0056] In the present application, “embodiment” means that the specific features, structures or characteristics described in combination with the embodiments can be included in at least one embodiment of the present application. The phrase appears at various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment to other embodiments.

[0057] In the description of the utility model, it is necessary to explain that, unless there is definite stipulation and limitation, the term "installation", "connection", "connection", "attachment" should be broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected;It can be directly connected, or indirectly connected through an intermediate medium, it can be the communication inside two elements.For ordinary skilled person in the art, the specific meaning of the above-mentioned term in the utility model can be understood according to the specific circumstances.

[0058] In the utility model, the term "and / or" is merely a description of the association relationship of the associated object, which represents that there can be three kinds of relationships, for example, A and / or B can represent that there are three kinds of situations, such as A alone, A and B exist simultaneously and B alone.In addition, the character " / " in the utility model generally represents that the front and rear associated objects are a kind of "or" relationship.

[0059] In the embodiments of the utility model, the same reference signs represent the same parts, and for brevity, the detailed description of the same parts is omitted in different embodiments.It should be understood that the thickness, length and width of various components in the embodiments of the utility model shown in the drawings, and the overall thickness, length and width of the integrated device are only exemplary, and should not constitute any limitation on the utility model.

[0060] In the utility model, "multiple" refers to two or more (including two).

[0061] In the embodiments of the utility model, if there is no special description, all the embodiments and optional embodiments of the utility model can be combined to form new technical solutions.

[0062] In the embodiments of the utility model, if there is no special description, all the technical features and optional technical features of the utility model can be combined to form new technical solutions.

[0063] In the embodiments of the utility model, the battery device (Battery Apparatus) can include one or more battery cell assemblies for providing voltage and capacity.The battery cell assembly (Battery Cell Assembly) can include a plurality of battery cells, and the plurality of battery cells are connected in series, parallel or mixed connection through the bus component.For example, the battery cell assembly (Battery Cell Assembly) is usually formed by arranging a plurality of battery cells;The battery cell assembly can be a battery module (Battery Module), and the battery module is formed by arranging and fixing a plurality of battery cells to form an independent module.As an example, the battery module can be bundled by a cable tie to form a plurality of battery cells.

[0064] The battery device can be a battery pack including a case and one or more battery cell assemblies housed in the case. The battery cell assembly can be a battery module housed in the case by fixing the battery module in the case, or the battery cell assembly can be housed in the case by fixing a plurality of battery cells directly to the case.

[0065] In an embodiment of the utility model, the battery case can include a first case and a second case. The first case and the second case are fastened to form a closed space inside the case to accommodate the battery cell assembly. Here, closed means covered or closed, which can be sealed or unsealed. The first case can be a top cover or a bottom plate. For example, the battery case can include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame to form a closed space inside the case to accommodate the battery cell assembly.

[0066] In an embodiment of the utility model, the battery case can be part of the chassis structure of the vehicle. For example, part of the battery case can be at least part of the floor of the vehicle, or part of the battery case can be at least part of the cross beam and the longitudinal beam of the vehicle.

[0067] In an embodiment of the utility model, the battery cell can be a secondary battery, which means that the battery cell can be activated by charging after discharging. The battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead-acid battery, etc. The embodiment of the utility model is not limited in this regard. The battery cell can be in the shape of a cylinder, a flat body, a cuboid, or other shapes, and the embodiment of the utility model is not limited in this regard. The battery cell is generally divided into three types according to the packaging method: cylindrical battery cell, square battery cell, and soft pack battery cell, and the embodiment of the utility model is not limited in this regard.

[0068] At present, from the development of market situation, the application of battery is more and more widely. The battery is not only applied to the energy storage power supply system of hydropower, thermal power, wind power and solar power station, but also widely used in electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power battery, the market demand is also increasing.

[0069] The electrode assembly of the battery cell includes an electrode body and a tab portion connected thereto, and an insulating layer is formed on the tab portion to prevent short circuit or other electrical faults of the battery cell. In related technologies, the overall thickness of the tab portion of the electrode assembly is large, which requires a large space in the shell of the battery cell, thereby reducing the volume energy density of the battery cell.

[0070] And, in the related art, in the production process of the electrode assembly, a continuous insulating layer is first coated on the edge portion of the electrode sheet, and then the tab is obtained by die cutting the area of the electrode sheet with the insulating layer, so that the tab portion has the insulating layer. However, this production method will cause waste of insulating material during die cutting, and the insulating layer is provided on each tab of the tab portion, and the overall thickness of the tab portion is also large.

[0071] Therefore, the utility model discloses a battery monomer, battery monomer includes: casing and electrode assembly, electrode assembly is located in the containing cavity of casing, electrode assembly includes electrode main part and tab portion, tab portion is connected to the end portion of electrode main part along the first direction, and tab portion includes a plurality of tab pieces of superimposed, and the plurality of tab pieces in tab portion includes first tab piece, second tab piece and at least one third tab piece, and the third tab piece is located between first tab piece and second tab piece.

[0072] Wherein, the surface of first tab piece away from third tab piece is first surface, the surface of second tab piece away from third tab piece is second surface, first surface and second surface constitute at least partial outer surface of tab portion, at least partial of first surface is towards electrode main part, and the portion of first surface towards electrode main part is provided with first insulating layer, and the whole surface of each third tab piece is conductive surface.

[0073] In the above battery monomer, by making the portion of the first surface of the first tab piece towards the electrode main part provided with the first insulating layer, so that the first insulating layer can form effective insulation between the tab portion and the electrode main part, and the first insulating layer can effectively avoid the tab portion from being accidentally contacted with the electrode main part or other conductive components to cause electrical faults such as short circuit during the assembly or use of the battery monomer. In addition, by making the whole surface of each third tab piece be conductive surface, so that the surface of the third tab piece is not coated with the first insulating layer, which is conducive to reducing the overall thickness of the tab portion and the space occupied by the tab portion in the casing, and further conducive to improving the volumetric energy density of the battery monomer.

[0074] The battery device disclosed in the embodiments of the utility model can be used in various energy storage systems using the battery device as a power source or as an energy storage element. In addition to being used in vehicles, the battery device can also be used in, but not limited to, mobile phones, tablets, notebook computers, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Among them, the electric toys can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric plane toys, etc. The spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0075] The electric device disclosed in the embodiments of the utility model can be a fuel automobile, a gas automobile or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid automobile or a range extended automobile. The vehicle is internally provided with a battery device, which can be arranged at the bottom, the head or the tail of the vehicle. The battery device can be used for power supply of the vehicle, for example, the battery device can be used as the operating power supply of the vehicle. The vehicle can further include a controller and a motor, and the controller is used for controlling the battery device to supply power to the motor, for example, for the working power demand of the vehicle during starting, navigation and driving. In some embodiments of the utility model, the battery device can not only be used as the operating power supply of the vehicle, but also be used as the driving power supply of the vehicle, to replace or partially replace fuel or natural gas to provide driving power for the vehicle.

[0076] Reference will be made to Figures 1-10 The battery monomer 100, the battery device 200 and the electric device 1000 according to the embodiments of the utility model are described below.

[0077] Reference Figures 1-6 In a first aspect, the utility model provides a kind of battery monomer 100, battery monomer 100 includes: shell 20 and electrode assembly 10, shell 20 has accommodating cavity, electrode assembly 10 is located in accommodating cavity, and electrode assembly 10 includes electrode main body 1 and tab portion 2, tab portion 2 is connected to the end of electrode main body 1 along the first direction, tab portion 2 includes multiple stacked tab sheet, multiple tab sheet in tab portion 2 includes first tab sheet 21, second tab sheet 22 and at least one third tab sheet 23, third tab sheet 23 is located between first tab sheet 21 and second tab sheet 22.

[0078] Wherein, the surface of first tab sheet 21 away from third tab sheet 23 is first surface 211, the surface of second tab sheet 22 away from third tab sheet 23 is second surface 221, first surface 211 and second surface 221 constitute at least part of the outer surface of tab portion 2, at least part of first surface 211 is towards electrode main body 1, first surface 211 in the part towards electrode main body 1 is provided with first insulating layer 3, the entire surface of each third tab sheet 23 is conductive surface.

[0079] First surface 211 in the part towards electrode main body 1 is provided with first insulating layer 3, first insulating layer 3 can play the insulating role between tab portion 2 and electrode main body 1, in the process of assembling or using of battery monomer 100, first insulating layer 3 can effectively avoid tab portion 2 to cause short circuit and other electrical faults due to accidental contact to electrode main body 1 or other conductive components.

[0080] The first surface 211 of the first tab of the tab portion 2 is provided with the first insulating layer 3, the entire surface of each third tab 23 is a conductive surface, and the third tab 23 is not provided with a corresponding insulating layer, so that the thickness of the third tab 23 is smaller than that of the third tab 23 provided with the insulating layer, thereby reducing the overall thickness of the tab portion 2 formed by the plurality of tabs stacked, and facilitating the reduction of the space occupied by the tab portion 2 in the battery monomer 100, thereby facilitating the improvement of the volume energy density of the battery monomer 100.

[0081] For example, the electrode body 1 includes a first tab, and the first tab 21 is connected to the end of the first tab in the first direction. In the production process of the battery monomer 100, the following steps can be included: first, the first tab 21 is obtained by die cutting the end of the first tab, and then the first insulating layer 3 is sprayed on the surface of the first tab 21. In this way, in the production process of the battery monomer 100, the first insulating layer 3 can be separately provided on the first tab 21 after the tab die cutting is completed, which can avoid waste of insulating material during the die cutting process, thereby facilitating the reduction of the production cost of the battery monomer 100.

[0082] For example, the plurality of tabs in the tab portion 2 includes the first tab 21, the second tab 22, and one third tab 23; for example, the plurality of tabs in the tab portion 2 includes the first tab 21, the second tab 22, and a plurality of third tabs 23.

[0083] The first surface 211 and the second surface 221 constitute at least part of the outer surface of the tab portion 2, which can include the following cases: for example, the first surface 211 and the second surface 221 constitute part of the outer surface of the tab portion 2; for example, the first surface 211 and the second surface 221 constitute the entire outer surface of the tab portion 2.

[0084] The first surface 211 is at least partially directed towards the electrode body 1, and the portion of the first surface 211 directed towards the electrode body 1 is provided with the first insulating layer 3, which can include the following cases: for example, part of the first surface 211 is directed towards the electrode body 1, and the first insulating layer 3 is provided on the part of the first surface 211 directed towards the electrode body 1; for example, part of the first surface 211 is directed towards the electrode body 1, and the first insulating layer 3 is provided on the first surface 211 directed towards the electrode body 1; for example, the entire first surface 211 is directed towards the electrode body 1, and the first insulating layer 3 is provided on part of the first surface 211.

[0085] Optionally, the electrode body 1 includes a first tab and a second tab, and the polarities of the first tab and the second tab are opposite, for example, the first tab is a cathode tab, and the second tab is an anode tab. A separator is further provided between the first tab and the second tab to separate them, and the separator has good insulating properties.

[0086] Optionally, the first insulating layer 3 can be a metal oxide layer or an insulating adhesive layer; optionally, the first insulating layer 3 can be formed by coating, spraying or the like.

[0087] Optionally, the second surface 221 of the second tab 22 can also be provided with an insulating layer, for example, the insulating layer is formed of the same insulating material as the first insulating layer 3.

[0088] In the above technical solution, by providing the first insulating layer 3 on the first surface 211 of the first tab 21 facing the electrode body 1, the first insulating layer 3 can form an effective insulation effect between the tab portion 2 and the electrode body 1, and during the assembly or use of the battery monomer 100, the first insulating layer 3 can effectively avoid the tab portion 2 from being accidentally contacted with the electrode body 1 or other conductive components to cause electrical faults such as short circuit; in addition, by making the entire surface of each third tab 23 be a conductive surface, the surface of the third tab 23 is not coated with the first insulating layer 3, which is conducive to reducing the overall thickness of the tab portion 2 and reducing the space occupied by the tab portion 2 in the shell 20, thereby improving the volumetric energy density of the battery monomer 100.

[0089] In some embodiments, the first insulating layer 3 is an insulating adhesive layer.

[0090] In the above technical solution, by making the first insulating layer 3 be an insulating adhesive layer, the insulating adhesive layer has good flexibility and can maintain its insulating performance when being bent or slightly deformed, and the adhesion between the insulating adhesive layer and the first tab 21 is good, so that it is closely attached to the first surface 211, which can provide uniform and reliable insulation effect. In addition, the insulating adhesive layer can be quickly formed on the first electrode sheet by coating, spraying or the like, which is simple to operate and suitable for large-scale production.

[0091] In some embodiments, the first insulating layer 3 is a UV adhesive layer.

[0092] Optionally, the first insulating layer 3 is formed by spraying a UV adhesive layer on the first tab 21 using a UV spraying device, and then irradiating with an infrared light to cure the UV adhesive layer.

[0093] In the above technical solution, by making the first insulating layer 3 be a UV adhesive layer, the UV adhesive is a light-cured adhesive which can be quickly cured by light irradiation, which is conducive to improving the production efficiency, and the UV adhesive layer has excellent insulation, which is conducive to further improving the insulation protection effect of the first insulating layer 3; in addition, the adhesion between the UV adhesive layer and the tab and the flexibility of the material are good.

[0094] Reference Figure 7In some embodiments, the projection of the third tab 23 on the reference plane is located within the projection of the first tab 21 on the reference plane, and the reference plane is a plane perpendicular to the first direction.

[0095] Optionally, during the production of the battery monomer 100, the size of the first tab 21 in the flat state is greater than or equal to the size of the third tab 23 in the flat state, for example, in the flat state, the width of the first tab 21 is greater than the width of the third tab 23, and the height of the first tab 21 is greater than the height of the third tab 23.

[0096] In the above technical solution, by making the projection of the third tab 23 on the reference plane located within the projection of the first tab 21 on the reference plane, so that in the battery monomer 100, the first tab 21 can wrap the third tab 23, so that the first insulation layer 3 can form an effective insulation effect between the whole tab part 2 and the electrode body 1, to avoid the electrode body 1 contacting the conductive surface of the third tab 23 and other areas to cause short circuit and other electrical faults.

[0097] Reference Figure 4 In some embodiments, the electrode body 1 includes a tab body 11, and an active material layer 12 and a second insulation layer 13 provided on the tab body 11, the second insulation layer 13 is located on the side of the active material layer 12 adjacent to the tab part 2 along the first direction, and the second insulation layer 13 is located on the edge of the tab body 11 along the first direction, and the first insulation layer 3 extends to the root of the first tab 21.

[0098] Among them, the root of the first tab 21 refers to the position of the first tab 21 connected with the tab body 11.

[0099] The second insulation layer 13 is provided on the edge of the tab body 11 along the first direction, so that the thickness difference of the region of the tab body 11 provided with the active material layer 12 and the second insulation layer 13 is small.

[0100] By making the first insulation layer 3 extend to the root of the first tab 21, the first insulation layer 3 better covers the part of the first tab 21 towards the electrode body 1, which is conducive to improving the insulation protection performance of the first insulation layer 3.

[0101] In the above technical solution, by providing the second insulation layer 13 on the edge of the tab body 11 along the first direction, it is conducive to avoiding the distortion and wrinkle of the tab during the production of the battery monomer 100, and reducing or avoiding the generation of too much burr and other defects during the die cutting process of the tab, in addition, the insulation layer also plays an insulation role in the electrode body 1, which helps to improve the safety performance of the battery monomer 100.

[0102] Optionally, the active material layer 12 and the second insulating layer 13 are arranged along the first direction, the active material layer 12 is located at the center part of the pole piece body 11, and the second insulating layer 13 is located at both sides of the active material layer 12 along the first direction and at the edge part of the pole piece body 11.

[0103] Optionally, the first insulating layer 3 and the second insulating layer 13 can be formed of the same insulating material, or the first insulating layer 3 and the second insulating layer 13 can be formed of different insulating materials.

[0104] Reference Figure 4 In some embodiments, the first insulating layer 3 and the second insulating layer 13 are adjacent to each other along the first direction, or the first insulating layer 3 and the second insulating layer 13 have a first overlapping area, and a size of the first overlapping area along the first direction is less than or equal to 1 mm.

[0105] In the above technical solution, by making the first insulating layer 3 and the second insulating layer 13 adjacent to each other or having the first overlapping area, the risk of short circuit caused by the area without insulating material between the first insulating layer 3 and the second insulating layer 13 is avoided, and the reliability of the insulation protection of the first insulating layer 3 and the second insulating layer 13 and the safety performance of the battery cell 100 are further improved; by making the size of the first overlapping area along the first direction less than or equal to 1 mm, the waste of insulating material is reduced or avoided under the premise of ensuring the insulation effect.

[0106] Reference Figure 4 In some embodiments, the active material layer 12 and the second insulating layer 13 are adjacent to each other along the first direction, or the active material layer 12 and the second insulating layer 13 have a second overlapping area, and a size of the second overlapping area along the first direction is less than or equal to 0.5 mm.

[0107] In the above technical solution, by making the active material layer 12 and the second insulating layer 13 adjacent to each other or having the second overlapping area, the reliability of the insulation protection of the second insulating layer 13 is improved; by making the size of the second overlapping area along the first direction less than or equal to 0.5 mm, the waste of insulating material is reduced or avoided under the premise of ensuring the insulation effect.

[0108] In some embodiments, the first insulating layer 3 and the second insulating layer 13 are independently formed.

[0109] In the above technical solution, by making the first insulating layer 3 and the second insulating layer 13 independently formed, the first insulating layer 3 and the second insulating layer 13 can each flexibly select a suitable insulating material and process, the coverage areas of the first insulating layer 3 and the second insulating layer 13 can be flexibly designed and adjusted, and the processing sequence of the first insulating layer 3 and the second insulating layer 13 can be flexibly adjusted.

[0110] In some embodiments, the first insulating layer 3 and the second insulating layer 13 are respectively formed of different insulating materials.

[0111] In the above technical solution, by making the first insulating layer 3 and the second insulating layer 13 respectively formed of different insulating materials, the appropriate insulating materials and the appropriate process can be selected according to the setting area and the function of the first insulating layer 3 and the second insulating layer 13 during the production process of the battery monomer 100, so as to optimize the performance and production process of the battery monomer 100.

[0112] In some embodiments, the second insulating layer 13 is a metal oxide layer. Optionally, the metal oxide layer can be an aluminum oxide layer, a titanium oxide layer, a zirconium oxide layer, a magnesium oxide layer, etc.

[0113] In the above technical solution, by making the second insulating layer 13 a metal oxide layer, it is conducive to strengthening the infiltration effect of the electrolyte in the battery monomer 100 on the pole body 11, and the metal oxide layer has excellent insulating properties, high temperature resistance and chemical stability, thereby facilitating the improvement of the performance of the battery monomer 100.

[0114] In some embodiments, the second surface 221 is provided with a third insulating layer. Optionally, the third insulating layer is an insulating adhesive layer, for example, the third insulating layer is a UV adhesive layer.

[0115] For example, the electrode body 1 includes a first pole piece, and the first tab piece 21 and the second tab piece 22 are connected to the end of the first pole piece in the first direction. In the production process of the battery monomer 100, the following steps can be included: first, the first tab piece 21 and the second tab piece 22 are obtained by die cutting the end of the first pole piece, then the first insulating layer 3 is sprayed on the first surface 211 of the first tab piece 21, and the third insulating layer is sprayed on the second surface 221 of the second tab piece 22. In this way, in the production process of the battery monomer 100, the first insulating layer 3 can be set on the first tab piece 21 and the third insulating layer can be set on the second tab piece 22 after the tab die cutting is completed, which can avoid waste of insulating materials during the die cutting process, thereby facilitating the reduction of the production cost of the battery monomer 100.

[0116] In the above technical solution, the second surface 221 also constitutes at least part of the outer surface of the tab part 2, so that the second surface 221 also has a certain risk of causing electrical faults such as short circuit. The setting of the third insulating layer is conducive to avoiding the contact between the second tab piece 22 and other conductive components to cause electrical faults such as short circuit, thereby facilitating the further improvement of the insulating protection performance of the tab part 2 and the performance of the battery monomer 100.

[0117] In some embodiments, the third insulating layer is made of the same insulating material as the first insulating layer 3.

[0118] In the above technical solution, by making the third insulating layer and the first insulating layer 3 of the same insulating material, the processing and production process of the electrode assembly 10 is simplified, thereby improving the production efficiency of the battery monomer 100.

[0119] In some embodiments, the electrode body 1 includes the tab body 11, the active material layer 12 and the second insulating layer 13 provided on the tab body 11, the second insulating layer 13 is located on the side of the active material layer 12 adjacent to the tab ear part 2 along the first direction, and the second insulating layer 13 is located on the edge part of the tab body 11 along the first direction, and the third insulating layer extends to the root of the first tab ear 21.

[0120] Among them, the root of the first tab ear 21 refers to the position of the first tab ear 21 connected with the tab body 11.

[0121] The second insulating layer 13 is arranged on the edge part of the tab body 11 along the first direction, so that the thickness difference of the region of the tab body 11 where the active material layer 12 and the second insulating layer 13 are arranged is small.

[0122] By making the third insulating layer extend to the root of the first tab ear 21, the third insulating layer better covers the part of the first tab ear 21 towards the electrode body 1, which is conducive to improving the insulation and protection performance of the third insulating layer.

[0123] In the above technical solution, by arranging the second insulating layer 13 on the edge part of the tab body 11 along the first direction, it is conducive to avoiding the occurrence of distortion and wrinkles in the tab and reducing or avoiding the occurrence of excessive burrs and other defects in the die-cutting process of the tab ear during the production process of the battery monomer 100. In addition, the insulating layer also plays an insulating role in the electrode body 1, which helps to improve the safety performance of the battery monomer 100.

[0124] In some embodiments, in the first direction, the third insulating layer and the second insulating layer 13 are adjacent; or the third insulating layer and the second insulating layer 13 have a first overlapping region, and the size of the first overlapping region along the first direction is less than or equal to 1mm.

[0125] In the technical scheme, the third insulating layer and the second insulating layer 13 are adjacent or have the first overlapping area, so that the area without the insulating material between the third insulating layer and the second insulating layer 13 is avoided, and the risk of short circuit caused by the area is avoided, the reliability of the insulation protection of the third insulating layer and the second insulating layer 13 is further improved, and the safety performance of the battery monomer 100 is improved; the size of the first overlapping area in the first direction is less than or equal to 1 mm, so that the waste of the insulating material is reduced or avoided under the premise of ensuring the insulation effect.

[0126] Reference Figures 7-8 In some embodiments, the tab portion 2 has a bending structure, and in the direction from the root of the tab portion 2 to the free end of the tab portion 2, the tab portion 2 includes a plurality of bending portions 24 connected in sequence, and the plurality of bending portions 24 are arranged in the first direction, and the bending portion 24 closest to the electrode body 1 is provided with the first insulating layer 3 in the first direction.

[0127] Optionally, the bending structure of the tab portion 2 is in a C shape or an S shape.

[0128] In the technical scheme, the tab portion 2 has a bending structure, which is beneficial to improve the structural strength of the tab portion 2; the bending portion 24 closest to the electrode body 1 is provided with the first insulating layer 3, which can effectively avoid the tab portion 2 from accidentally contacting the electrode body 1 during assembly or use to cause short circuit and other electrical faults, and improve the reliability of electrical connection.

[0129] Next, the battery monomer 100 according to some embodiments of the utility model will be described with reference to the accompanying drawings. Figures 1-8 The battery monomer 100 according to some embodiments of the utility model will be described.

[0130] Reference Figures 1-8 In this embodiment, the battery monomer 100 includes a shell 20 and an electrode assembly 10, the shell 20 has a receiving cavity, the electrode assembly 10 is arranged in the receiving cavity, and the electrode assembly 10 includes an electrode body 1 and a tab portion 2, the tab portion 2 is connected to the end portion of the electrode body 1 in the first direction, the tab portion 2 includes a plurality of stacked tab pieces, the plurality of tab pieces in the tab portion 2 include a first tab piece 21, a second tab piece 22 and at least one third tab piece 23, and the third tab piece 23 is located between the first tab piece 21 and the second tab piece 22.

[0131] The projection of the third tab piece 23 on the reference surface is located in the projection of the first tab piece 21 on the reference surface, and the reference surface is a plane perpendicular to the first direction.

[0132] The surface of the first tab sheet 21 away from the third tab sheet 23 is a first surface 211, the surface of the second tab sheet 22 away from the third tab sheet 23 is a second surface 221, the first surface 211 and the second surface 221 constitute at least part of the outer surface of the tab part 2, at least part of the first surface 211 faces the electrode body 1, the part of the first surface 211 facing the electrode body 1 is provided with the first insulating layer 3, and the second surface 221 is provided with the third insulating layer.

[0133] The electrode body 1 includes a tab body 11, an active material layer 12 and a second insulating layer 13 provided on the tab body 11, the second insulating layer 13 is located on the side of the active material layer 12 adjacent to the tab part 2 along the first direction, the active material layer 12 and the second insulating layer 13 have a second overlapping area, and the size of the second overlapping area along the first direction is less than or equal to 0.5mm. The second insulating layer 13 is located at the edge of the tab body 11 along the first direction, the first insulating layer 3 extends to the root of the first tab sheet 21, the first insulating layer 3 and the second insulating layer 13 have a first overlapping area, and the size of the first overlapping area along the first direction is less than or equal to 1mm.

[0134] The first insulating layer 3, the second insulating layer 13 and the third insulating layer are independently formed, the first insulating layer 3 and the second insulating layer 13 are respectively formed by different insulating materials, and the third insulating layer is made of the same insulating material as the first insulating layer 3. The first insulating layer 3 is a UV glue layer, the second insulating layer 13 is a metal oxide layer, and the third insulating layer is a UV glue layer.

[0135] The tab part 2 has a bending structure, and in the direction from the root of the tab part 2 to the free end of the tab part 2, the tab part 2 includes a plurality of bending parts 24 connected in sequence, the plurality of bending parts 24 are arranged along the first direction, and in the first direction, the first insulating layer 3 is arranged on the bending part 24 closest to the electrode body 1.

[0136] Reference Figure 9 In the second aspect, the utility model provides a kind of battery device 200, battery device 200 includes battery box and battery monomer assembly, battery box has installation cavity, battery monomer assembly is located in installation cavity and includes multiple battery monomers 100, and battery monomer 100 is above-mentioned battery monomer 100.

[0137] In the above technical solution, the battery box supports and protects the multiple battery monomers 100, and by providing the above-mentioned battery monomer 100, it is beneficial to reduce or avoid electrical faults such as short circuit of the battery device 200, improve the safety performance of the battery device 200, and also beneficial to improve the volume energy density of the battery device 200 and reduce material waste in the production process of the battery device 200.

[0138] Reference Figure 10 In a third aspect, the utility model provides a kind of electric device 1000, including above-mentioned battery device 200.

[0139] In the above technical solution, by setting above-mentioned battery device 200, battery device 200 by setting above-mentioned battery monomer 100, it is favorable to reduce or avoid short circuit and other electrical faults of battery device 200, improve the safety performance of battery device 200, also be favorable to improve the volumetric energy density of battery device 200, and reduce material waste in the production process of battery device 200, to improve the performance of electric device 1000 and reduce its cost advantageously.

[0140] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example" 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 the present specification, the illustrative description 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.

[0141] Although the embodiments of the utility model have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the utility model, and the scope of the utility model is defined by the claims and their equivalents.

Claims

1. A battery cell, characterized by, The battery device comprises: a housing having a receiving cavity; an electrode assembly arranged in the receiving cavity and comprising an electrode body and a tab portion connected to an end of the electrode body in a first direction, the tab portion comprising a plurality of stacked tab pieces, the plurality of tab pieces in the tab portion comprising a first tab piece, a second tab piece, and at least one third tab piece, the third tab piece being located between the first tab piece and the second tab piece; wherein a surface of the first tab piece facing away from the third tab piece is a first surface, a surface of the second tab piece facing away from the third tab piece is a second surface, the first surface and the second surface constitute at least part of an outer surface of the tab portion, at least part of the first surface faces the electrode body, and a portion of the first surface facing the electrode body is provided with a first insulating layer, and the entire surface of each third tab piece is a conductive surface.

2. The battery cell of claim 1, wherein, The first insulating layer is an insulating adhesive layer.

3. The battery cell of claim 2, wherein, The first insulating layer is a UV adhesive layer.

4. The battery cell of claim 1, wherein, A projection of the third tab piece on a reference plane is located within a projection of the first tab piece on the reference plane, and the reference plane is a plane perpendicular to the first direction.

5. The battery cell of claim 1, wherein, The electrode body comprises a tab body and an active material layer and a second insulating layer arranged on the tab body, the second insulating layer is located on a side of the active material layer adjacent to the tab portion in the first direction, and the second insulating layer is located on an edge portion of the tab body in the first direction, and the first insulating layer extends to a root portion of the first tab piece.

6. The battery cell of claim 5, wherein, In the first direction, the first insulating layer and the second insulating layer are adjacent; or the first insulating layer and the second insulating layer have a first overlapping region, and a dimension of the first overlapping region in the first direction is less than or equal to 1 mm.

7. The battery cell of claim 5, wherein, In the first direction, the active material layer and the second insulating layer are adjacent; or the active material layer and the second insulating layer have a second overlapping region, and a dimension of the second overlapping region in the first direction is less than or equal to 0.5 mm.

8. The battery cell of claim 5, wherein, The first insulating layer and the second insulating layer are independently formed; and / or the first insulating layer and the second insulating layer are respectively insulating layers formed of different insulating materials.

9. The battery cell of claim 5, wherein, The second insulating layer is a metal oxide layer.

10. The battery cell of claim 1, wherein, The second surface is provided with a third insulating layer.

11. The battery cell of claim 10, wherein, The third insulating layer and the first insulating layer are made of the same insulating material.

12. The battery cell of any one of claims 1-11, wherein, The tab portion has a bending structure, and in a direction from a root portion of the tab portion to a free end of the tab portion, the tab portion comprises a plurality of bending portions connected in sequence, the plurality of bending portions are arranged in the first direction, and the first insulating layer is arranged on the bending portion closest to the electrode body in the first direction.

13. A battery device characterized by comprising: The battery device comprises: a battery box having a mounting cavity; a battery monomer assembly arranged in the mounting cavity and comprising a plurality of battery monomers, the battery monomers being the battery monomers according to any one of claims 1-12.

14. An electrical device, comprising: The battery device comprises: the battery device according to claim 13.

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