Battery cell, battery device and electric device

Abstract

The utility model discloses a battery monomer, a battery device and a power utilization device, the battery monomer comprises a shell, an electrode assembly and a first adhesive tape, and the shell is provided with an electrode terminal; the electrode assembly comprises a main body part and a tab led out from the end part of the main body part, the tab is connected with the electrode terminal, and a welding mark is formed on one side, far away from the electrode terminal, of the tab; the first adhesive tape comprises a first section, a second section and a third section which are connected in sequence, the first section is adhered to the main body part, at least part of the second section covers the welding mark, and the third section is adhered to the tab; wherein the light transmittance of the second section is greater than or equal to 80%. The reliability of the battery monomer is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery monomer, a battery device and a power utilization device. BACKGROUND

[0002] In recent years, with the rapid development of new energy technology, new energy vehicles are increasingly widely used and gradually replace traditional fuel vehicles to become one of the mainstream transportation tools. As the power source of new energy vehicles, power batteries are one of the core equipment of new energy vehicles, and therefore, the safety performance of power batteries has become the focus of attention.

[0003] In the development of battery technology, how to improve the reliability of the battery monomer is a research direction in the battery technology. CONTENT OF THE INVENTION

[0004] The embodiments of the present application provide a battery monomer, a battery device and a power utilization device, which can improve the reliability of the battery monomer.

[0005] In a first aspect, the embodiments of the present application provide a battery monomer, which comprises a shell, an electrode assembly and a first adhesive tape, the shell is provided with an electrode current guide structure; the electrode assembly comprises a main body part and a tab led out from an end of the main body part, the tab is welded with the electrode current guide structure and forms a welding mark on a side of the tab away from the electrode current guide structure, and the electrode current guide structure is used for conducting current between the electrode assembly and a component located outside the shell; the first adhesive tape comprises a first section, a second section and a third section connected in sequence, the first section is bonded with the main body part, at least part of the second section covers the welding mark, and the third section is bonded with the tab; and the light transmittance of the second section is greater than or equal to 80%.

[0006] In the above scheme, the first section and the third section are used to realize the folding and bonding of the tab, and at least part of the second section covers the welding mark, and the light transmittance of the second section is greater than or equal to 80%, which can facilitate the observation of the welding mark with the naked eye, and if there is an abnormality at the welding mark, it can be found in time, thereby improving the abnormal detection capability of visual inspection and the reliability of the battery monomer.

[0007] In some embodiments, the adhesion of the second section is less than that of the first section and the third section, respectively.

[0008] In the above scheme, since the adhesion of the second section is smaller, the cracking phenomenon of the tab caused by the resilience of the first adhesive tape can be improved.

[0009] In some embodiments, the tab comprises a plurality of tab layers, the plurality of tab layers are stacked, each tab layer comprises a connecting end and a free end, the connecting end is connected with the main body part, and the free end is arranged away from the main body part; the first section covers the connecting end of at least one tab layer on the side away from the electrode current guide structure.

[0010] In the above scheme, by adopting the first section to bond the connecting section of at least one tab layer away from the switching component side, at least part of the tab can be fixed, the stability of the tab can be improved, and the deformation of the tab can be reduced.

[0011] In some embodiments, in the direction along the first section pointing to the second section, the width of the first section covering the tab is L1, and L1 satisfies: 1mm≤L1≤5mm.

[0012] In the above scheme, by limiting the range of the width of the first section covering the tab, the stability of the tab can be ensured to a certain extent, and the cracking phenomenon of the tab can be improved.

[0013] In some embodiments, L1 satisfies: 2mm≤L1≤4mm.

[0014] In the above scheme, by further narrowing the range of the width of the first section covering the tab, the stability of the tab and the ability to improve the cracking phenomenon of the tab can be further balanced.

[0015] In some embodiments, the projection of the welding mark is located within the projection of the second section, which can facilitate the observation of the entire welding mark from the outside with the naked eye, and further improve the abnormal detection ability of visual inspection.

[0016] In some embodiments, the light transmittance of the second section is greater than or equal to 90%, which can further improve the abnormal detection ability of visual inspection, thereby improving the reliability of the battery monomer.

[0017] In some embodiments, the light transmittance of the first section and / or the third section is less than or equal to 30%, which can make the first section and / or the third section opaque, thereby being able to improve the bonding strength at this position by coating the first section and / or the third section with an opaque adhesive material.

[0018] In some embodiments, in the direction along the thickness of the tab, the projection of the third section partially overlaps the projection of the welding mark, the width of the overlapping area of the projection of the third section and the projection of the welding mark is L2, and L2 satisfies: L2≤3mm.

[0019] In the above scheme, by limiting the width range of the third section overlapping the welding mark, the third section can be reduced to shield the welding mark, thereby further improving the abnormal detection ability of visual inspection.

[0020] In some embodiments, L2 satisfies: L2≤2mm.

[0021] In the above scheme, by further narrowing the width range of the third section overlapping the welding mark, the shielding of the third section to the welding mark is further reduced.

[0022] In some embodiments, a gap exists between the projection of the third section and the projection of the welding mark in the thickness direction of the tab, which can ensure that the third section does not block the welding mark to some extent, thereby further improving the abnormal detection capability of visual inspection.

[0023] In some embodiments, the distance between the third section and the welding mark is L3, and L3 satisfies: L3≤3mm.

[0024] In the above scheme, when the third section does not block the welding mark, by limiting the distance between the third section and the welding mark, the third section can be as close to the tab root as possible, thereby ensuring the stability of the tab to some extent.

[0025] In some embodiments, L3 satisfies: L3≤2mm.

[0026] In the above scheme, by further reducing the distance between the third section and the welding mark, the stability of the tab is further improved.

[0027] In some embodiments, the light transmittance of the first section and / or the third section is greater than or equal to 80%. By setting the first section and / or the third section to be transparent, the range of visual inspection can be increased.

[0028] In some embodiments, the edge of the third section is beyond the side of the tab away from the main body.

[0029] In the above scheme, by setting the edge of the third section to be beyond the side of the tab away from the main body, the third section can cover the end of the tab to some extent, and the adhesion is stable.

[0030] In some embodiments, the main body includes a side surface and an end surface connected to each other, the tab is arranged on the end surface, and a part of the first section is attached to the side surface of the main body.

[0031] In the above scheme, by attaching a part of the first section to the side surface of the main body, the adhesion of the first adhesive tape can be improved.

[0032] In some embodiments, in a direction perpendicular to the end surface, the width of the first section covering the side surface is L4, and L4 satisfies: 1mm≤L4≤20mm.

[0033] In the above scheme, by limiting the width range of the first section covering the side surface of the main body, the adhesion of the first adhesive tape can be improved, and the material is not wasted, and the cost is reduced.

[0034] In some embodiments, L4 satisfies: 8mm≤L4≤15mm.

[0035] In the above scheme, by further reducing the width range of the first section covering the side surface of the main body, the adhesion of the first adhesive tape and the cost are further considered.

[0036] In some embodiments, the electrode assembly further comprises a second adhesive tape, the second adhesive tape is arranged on the side of the tab facing the adapter component, and the second adhesive tape is located between the tab and the end cover.

[0037] In the above scheme, the second adhesive tape insulates and separates the tab from the end cover on the side of the tab facing the adapter component, thereby reducing the short circuit phenomenon.

[0038] In some embodiments, the electrode drainage structure comprises an electrode terminal arranged on the shell and an adapter component, the tab is welded to the adapter component, the adapter component is connected to the electrode terminal, and the welding mark is located on the side of the tab away from the adapter component.

[0039] In the above scheme, the adapter component can increase the connection area to reduce the contact resistance. In the case of high current charging and discharging, the lower contact resistance can reduce energy loss and improve the charging and discharging efficiency of the battery.

[0040] In some embodiments, the electrode drainage structure is an electrode terminal, and the tab is welded to the electrode terminal.

[0041] In the above scheme, by directly welding the tab to the electrode terminal, the space inside the battery monomer can be reduced, thereby improving the energy density of the battery.

[0042] In a second aspect, the embodiments of the present application further provide a battery device comprising the battery monomer of any of the above embodiments.

[0043] In a third aspect, the embodiments of the present application further provide a power consuming device comprising the battery device, and the battery device is used to provide electric energy.

[0044] The above description is only a summary of the technical solutions of the present application. In order to more clearly understand the technical means of the present application, the following specific embodiments of the present application can be implemented according to the content of the specification, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0045] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of these drawings.

[0046] Figure 1 The structure schematic diagram of the vehicle of some embodiments of the present application;

[0047] Figure 2An exploded view of a battery device according to some embodiments of the present application;

[0048] Figure 3 A structural view of a battery module according to some embodiments of the present application;

[0049] Figure 4 An exploded structural view of a battery cell according to some embodiments of the present application;

[0050] Figure 5 A structural view of a first gel according to some embodiments of the present application;

[0051] Figure 6 A partial view of a battery device according to some embodiments of the present application;

[0052] Figure 7 An assembly view of a tab and a switching member according to some embodiments of the present application;

[0053] Figure 8 A partial top view of a battery device according to some embodiments of the present application;

[0054] Figure 9 A partial side view of a battery cell according to some embodiments of the present application;

[0055] Figure 10 An enlarged view of A portion in FIG. 1; Figure 9

[0056] An overlapping view of a second non-second section and a tab according to some embodiments of the present application; Figure 11

[0057] An enlarged view of B portion in FIG. 1; Figure 12 Figure 8 An enlarged view of C portion in FIG. 1;

[0058] Figure 13 Figure 9 A partial side view of a battery cell according to some embodiments of the present application;

[0059] Figure 14 Another partial side view of a battery cell according to some embodiments of the present application;

[0060] Figure 15 A partial side view of a battery cell according to some other embodiments of the present application.

[0061] Explanation of Reference Numerals:

[0062] ​​1000, vehicle; 100, battery device; 200, controller; 300, motor; 10, upper cover; 30, box body; 400, battery module; 20, battery cell; 22, shell; 21, end cover; 24, housing; 23, electrode assembly; 26, electrode terminal; 25, adapter component; 231, main body; 232, tab; 233, tab layer; 234, connection end; 235, free end; 236, side surface; 237, end surface; 27, electrode drainage structure; 50, first adhesive tape; 51, first section; 52, second section; 53, third section; 60, welding mark; 70, second adhesive tape. DETAILED DESCRIPTION

[0063] The embodiments of the present application will be further described in conjunction with the drawings and examples. The detailed description and drawings of the following examples are intended to illustrate the principles of the present application, but should not be used to limit the scope of the present application, i.e., the present application is not limited to the described examples.

[0064] In the description of the present application, it should be noted that, unless otherwise specified, the meaning of "a plurality of" is more than two; the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer" and the like merely indicates or suggests the orientation or positional relationship in the drawings and simplifies the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance. "Vertical" is not strictly vertical, but within the allowable error range. "Parallel" is not strictly parallel, but within the allowable error range.

[0065] In the present application, the phrase "embodiment" means that the specific features, structures or characteristics described in conjunction with the embodiment can be included in at least one embodiment of the present application. The appearance of this phrase 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. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in the present application can be combined with other embodiments.

[0066] The orientation words appearing in the following description are the directions shown in the drawings, and are not limited to the specific structure of the present application. In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0067] In the present application, the battery cell can include a lithium-ion secondary battery cell, a lithium-ion primary battery cell, a lithium-sulfur battery cell, a sodium lithium-ion battery cell, a sodium-ion battery cell, or a magnesium-ion battery cell, etc. The present application embodiments are not limited thereto. The battery cell can be in the shape of a cylinder, a flat body, a cuboid, or other shapes, etc. The present application embodiments are not limited thereto. The battery cell is generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells, and soft-pack battery cells, etc. The present application embodiments are not limited thereto.

[0068] The battery device mentioned in the embodiments of the present application can include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly can include a plurality of battery cells connected in series, in parallel, or in a mixed connection through a busbar component.

[0069] In some embodiments, the battery cell assembly is generally formed by arranging a plurality of battery cells; as an example, the battery cell assembly can be a battery module formed by arranging and fixing a plurality of battery cells into an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells with a cable tie.

[0070] In some embodiments, the battery device can be a battery pack including a box body and one or more battery cell assemblies accommodated in the box body.

[0071] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be accommodated in the box body by fixing the battery module in the box body.

[0072] As an example, the battery cell assembly can also be accommodated in the box body by directly fixing a plurality of battery cells in the box body.

[0073] The present application embodiments provide a power consumption device using a battery as a power source. The power consumption device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric car, a ship, a spacecraft, etc. Among them, the electric toy can include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric plane toy, etc. The spacecraft can include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0074] At present, the tab tape of the battery cell stacked in layers is gathered and fixed by using adhesive tape. However, the adhesive tape is generally a non-transparent blue adhesive tape, which completely blocks the welding mark. If the welding mark is abnormal, it cannot be found, which reduces the reliability of the battery cell.

[0075] In order to solve the above technical problems, the application provides a battery monomer, which comprises a shell, an adapter component, an electrode assembly and a first adhesive tape, the shell is provided with an electrode drainage structure; the electrode assembly comprises a main body part and a tab led out from an end of the main body part, the tab is welded with the electrode drainage structure and forms a welding mark on a side of the tab away from the electrode drainage structure, and the drainage structure is used for conducting current between the electrode assembly and a component located outside the shell; the first adhesive tape comprises a first section, a second section and a third section connected in sequence, the first section is bonded with the main body part, at least part of the second section covers the welding mark, and the third section is bonded with the tab; and the light transmittance of the second section is greater than or equal to 80%. In the above scheme, the first section and the third section are used to realize the folding and bonding of the tab, the second section can facilitate the naked eye to observe the welding mark, if there is an abnormality at the welding mark, it can be found in time, the abnormal detection capability of visual inspection is improved, and the reliability of the battery monomer is improved.

[0076] The following embodiments take a vehicle 1000 as an example for convenience of description.

[0077] Please refer to Figure 1 , Figure 1 The vehicle structure schematic diagram provided by some embodiments of the application. The vehicle 1000 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 1000 is internally provided with a battery device 100, which can be arranged at the bottom, head or tail of the vehicle 1000. The battery device 100 can be used for power supply of the vehicle 1000, for example, the battery device 100 can be used as the operating power supply of the vehicle 1000. The vehicle 1000 can further comprise a controller 200 and a motor 300, the controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, for the working power demand of the vehicle 1000 during starting, navigation and driving.

[0078] In some embodiments of the application, the battery device 100 can not only be used as the operating power supply of the vehicle 1000, but also be used as the driving power supply of the vehicle 1000, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle 1000.

[0079] Please refer to Figure 2 , Figure 2An exploded view of a battery device according to some embodiments of the present application. The battery device 100 includes a battery case and battery cells 20. In some embodiments, the battery case can include a top cover 10 and a case 30, the top cover 10 and the case 30 are coupled to each other, and the top cover 10 and the case 30 together define a receiving cavity for receiving the battery cells 20. The case 30 can be a hollow structure with one end open, and the top cover 10 can be a plate structure, which is coupled to the open end of the case 30 to make the top cover 10 and the case 30 together define the receiving cavity; or the top cover 10 and the case 30 can both be hollow structures with one side open, and the open side of the top cover 10 is coupled to the open side of the case 30. Of course, the battery case formed by the top cover 10 and the case 30 can have various shapes, such as a cylinder, a cuboid, etc.

[0080] Figure 3 A structural schematic diagram of a battery module according to some embodiments of the present application. In the battery device 100, the battery cells 20 can be multiple, and the multiple battery cells 20 can be connected in series, in parallel, or in a mixed connection, where the mixed connection means that some of the multiple battery cells 20 are connected in series and some are connected in parallel. The multiple battery cells 20 can be directly connected in series, in parallel, or in a mixed connection, and then the whole of the multiple battery cells 20 is received in the case; of course, the battery device 100 can also be in the form that the multiple battery cells 20 are first connected in series, in parallel, or in a mixed connection to form a battery module 400, and then the multiple battery modules 400 are connected in series, in parallel, or in a mixed connection to form a whole, which is received in the case. The battery device 100 can also include other structures, for example, the battery device 100 can also include a current combiner for realizing the electrical connection between the multiple battery cells 20.

[0081] Each of the battery cells 20 can be a secondary battery cell or a primary battery cell; it can also be a lithium-sulfur battery cell, a sodium-ion battery cell, or a magnesium-ion battery cell, but is not limited thereto. The battery cell 20 can be in the shape of a cylinder, a flat body, a cuboid, or other shapes, etc.

[0082] Please refer to Figure 4 , Figure 4 A disassembled structural schematic diagram of a battery cell according to some embodiments of the present application. The battery cell 20 refers to the smallest unit that constitutes a battery. The battery cell 20 includes an end cover 21, a shell 22, an electrode assembly 23, and other functional components.

[0083] The end cover 21 refers to a component that covers the opening of the shell 22 to isolate the internal environment of the battery monomer 20 from the external environment. Without limitation, the shape of the end cover 21 can be adapted to the shape of the shell 22 to fit the shell 22. Optionally, the end cover 21 can be made of a material with certain hardness and strength, such as aluminum alloy, so that the end cover 21 is not easily deformed when subjected to extrusion collision, so that the battery monomer 20 can have higher structural strength, and the safety performance can also be improved. The end cover 21 can be provided with functional components such as electrode terminals 26. The electrode terminals 26 can be used to electrically connect with the electrode assembly 23 for outputting or inputting the electrical energy of the battery monomer 20. In some embodiments, the end cover 21 can also be provided with a pressure relief mechanism for relieving the internal pressure when the internal pressure or temperature of the battery monomer 20 reaches a threshold value. The material of the end cover 21 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the present application does not make special limitations on this. In some embodiments, an insulating piece can also be provided on the inner side of the end cover 21, which can be used to isolate the electrical connection components in the shell 22 from the end cover 21 to reduce the risk of short circuit. Exemplarily, the insulating piece can be plastic, rubber, etc.

[0084] Figure 5 is a structural schematic diagram of a first adhesive tape according to some embodiments of the present application; Figure 6 is a partial schematic diagram of a battery device according to some embodiments of the present application; Figure 7 is an assembly schematic diagram of a tab and an adapter component according to some embodiments of the present application.

[0085] In the first aspect, please refer to Figures 5-7 The battery monomer 20 provided by the embodiments of the present application includes a shell 24, an adapter component 25, an electrode assembly 23 and a first adhesive tape 50, the shell 24 is provided with an electrode drainage structure 27; the electrode assembly 23 includes a main body part 231 and a tab 232 extending from the end of the main body part 231, the tab 232 is welded with the electrode drainage structure 27 and forms a welding mark 60 on the side of the tab 232 away from the electrode drainage structure 27, the electrode drainage structure 27 is used to conduct current between the electrode assembly 23 and the components located outside the shell 24; the first adhesive tape 50 includes a first section 51, a second section 52 and a third section 53 connected in sequence, the first section 51 is bonded with the main body part 231, at least part of the second section 52 covers the welding mark 60, and the third section 53 is bonded with the tab 232; wherein the light transmittance of the second section 52 is greater than or equal to 80%.

[0086] The shell 24 can include a housing 22 having an opening and an end cover 21 covering the opening. Alternatively, the shell 24 can be a one-piece structure. The shell 24 can be a cuboid, a cylinder, a hexagonal prism, etc. The electrode lead structure 27 can include an electrode terminal 26 and an adapter component 25. The electrode terminal 26 can be provided on the shell 24, and the tab 232 can be connected to the adapter component 25 by ultrasonic welding, and then the adapter component 25 is connected to the electrode terminal 26 by laser welding, so as to output the electric energy of the battery monomer 20 to the outside. One adapter component can be welded with the tab 232 of only one battery monomer 20, or one adapter component 25 can be welded with the tabs 232 of two battery monomers 20 at the same time. After the tab 232 is welded to the adapter component 25, a welding mark 60 is formed on the surface away from the adapter component 25. The shape of the welding mark 60 is different due to different welding methods. Alternatively, the tab 232 can be directly welded with the electrode terminal 26. The welding mark 60 can be rectangular, trapezoidal, etc.

[0087] The body part 231 can be stacked or wound by the pole piece. The tab 232 can be a positive tab 232 or a negative tab 232. The positive tab 232 is connected to the positive electrode terminal 26, and the negative tab 232 is connected to the negative electrode terminal 26. The positive tab 232 and the negative tab 232 can be located on different sides of the body part 231, or on the same side.

[0088] The body part 231 can be coated with an active material, and the tab 232 is a part not coated with the active material. For example, the body part 231 of the positive electrode can be made of an aluminum foil, and the body part 231 of the negative electrode can be made of a copper foil. The body part 231 of the positive electrode can be coated with a positive active material such as lithium cobaltate, lithium manganate, lithium iron phosphate, etc., and the body part 231 of the negative electrode can be coated with a negative active material such as graphite, silicon-carbon material, lithium titanate, etc. It should be noted that the positive tab 232 and the negative tab 232 are both bonded by the first adhesive tape 50. For ease of understanding, the tab 232 is described below.

[0089] It should be noted that the light transmittance refers to the percentage of light passing through the adhesive tape, which is a key physical index for measuring the transparency of the adhesive tape. The light transmittance can be tested by optical testing, in which light is irradiated onto the adhesive tape, and the light intensity received by a light detector after passing through the adhesive tape is the light transmittance. For example, the prepared adhesive tape sample is placed between the light source and the detector of the spectrophotometer, and the light is ensured to pass through the adhesive tape sample vertically. The light intensity after passing through the sample is measured by the spectrophotometer and recorded. At the same time, the incident light intensity without placing the adhesive tape sample is measured as a reference value under the same side viewing condition. According to the measured light transmittance and incident light intensity, the light transmittance of the adhesive tape is calculated. The calculation formula of the light transmittance is: light transmittance = transmittance light intensity / incident light intensity x 100%.

[0090] The first section 51 and / or the third section 53 of the first adhesive tape 50 can be non-transparent, with a light transmittance less than or equal to 30%; or the first section and / or the third section can be transparent, with a light transmittance greater than or equal to 80%. The first section 51 is attached to the main body part 231, and the third section 53 can be partially attached to the tab 232 and partially attached to the adapter part 25. The first section 51 and the third section 53 can be adhesive sections coated with blue adhesive or black adhesive. The second section 52 is transparent, with a light transmittance greater than or equal to 80%, and the condition of the welding mark 60 can be observed from the outside by the naked eye.

[0091] The first adhesive tape 50 is made of insulating material, thereby playing an insulating role and preventing the tab 232 from contacting the outside and causing a short circuit phenomenon to a certain extent.

[0092] In the above scheme, the tab 232 is folded and attached by the first section 51 and the third section 53, and the second section 52 corresponding to the welding mark 60 can facilitate the observation of the welding mark 60 by the naked eye. If there is an abnormality at the welding mark 60, it can be found in time, thereby improving the abnormal detection capability of visual inspection and the reliability of the battery monomer 20.

[0093] In some embodiments, the adhesion of the second section 52 is less than that of the first section 51 and the third section 53, respectively.

[0094] The adhesion of the first non-second section 52, the second non-second section 52, and the second section can be tested by the rolling ball plane stop method. The testing principle of the rolling ball plane stop method is that a steel ball with a diameter of 1.127 centimeters is rolled down from the top end of an inclined plate with a height of 6.1275 centimeters and an inclination of 21 degrees and 30 minutes with the horizontal plane. The steel ball stops on the adhesive surface of the high-temperature-resistant adhesive tape placed horizontally. The distance L rolled by the steel ball on the adhesive tape is a measure of the initial adhesion performance of the adhesive tape, with the unit being millimeters. The smaller the distance L, the better the initial adhesion performance.

[0095] The second section 52 can not be bonded with the tab 232, or the bonding strength is less than the bonding strength of the first section 51 and the third section 53 with the tab 232 respectively. When the first adhesive tape 50 rebounds, since the second section 52 corresponds to the middle of the welding mark 60, that is, the middle region of the tab 232, the second section 52 has no adhesion or less adhesion, and the tab 232 will not be easily torn.

[0096] In the above scheme, since the adhesion of the second section 52 is less, the cracking phenomenon of the tab 232 caused by the rebound of the first adhesive tape 50 can be improved.

[0097] Figure 8 is a partial top view of a battery device of some embodiments of the present application; Figure 9 is a partial side view of a battery cell of some embodiments of the present application.

[0098] Please refer to Figure 8 and Figure 9 In some embodiments, the tab 232 includes a plurality of tab layers 233, and the plurality of tab layers 233 are stacked, each tab layer 233 includes a connecting end 234 and a free end 235, the connecting end 234 is connected with the main body part 231, and the free end 235 is arranged away from the main body part 231; the first section 51 covers the connecting end 234 of at least one tab layer 233 away from the electrode drainage structure 27.

[0099] Each pole piece has a tab layer 233, and these tab layers 233 are sequentially stacked and folded towards the adapter component 25. The tab layer 233 close to the adapter component 25 is the inner tab layer 233, and the tab layer 233 away from the adapter component 25 is the outer tab layer 233. Among them, “at least one tab layer 233 away from the electrode drainage structure 27” refers to at least one tab layer 233 away from the electrode drainage structure 27 in the tab 232, which can be the outermost tab layer 233, or a plurality of stacked tab layers 233 on the outside.

[0100] “the first section 51 covers the connecting end 234 of at least one tab layer 233 away from the electrode drainage structure 27” refers to that the first section 51 covers the root of at least one outer tab layer 233, and the root of these tab layers 233 is pasted on the main body part 231.

[0101] In the above scheme, by using the first section 51 to bond the connecting section of at least one tab layer 233 away from the electrode drainage structure 27, at least part of the tab 232 can be fixed, the stability of the tab 232 can be improved, and the deformation of the tab 232 can be reduced.

[0102] Figure 10 is an enlarged schematic view of part A in Figure 9 .

[0103] In some embodiments, as shown in FIG. 1, the first section 51 covers the width of the tab 232 in a direction pointing from the first section 51 to the second section 52. Figure 10 The width of the first section 51 covering the tab 232 in the direction pointing from the first section 51 to the second section 52 is L1, which satisfies: 1mm≤L1≤5mm.

[0104] The direction in which the first section 51 points to the second section 52 refers to the extension direction of the first adhesive tape 50.

[0105] The width L1 of the first section 51 covering the tab 232 can be any value within the range of 1mm-5mm. For example, L1 can be 1mm, 2mm, 3mm, 4mm or 5mm.

[0106] In the above scheme, by limiting the range of the width of the first section 51 covering the tab 232, the stability of the tab 232 can be ensured to a certain extent, and the cracking phenomenon of the tab 232 can be improved.

[0107] In some embodiments, L1 satisfies: 2mm≤L1≤4mm.

[0108] The width L1 of the first section 51 covering the tab 232 can be any value within the range of 2mm-4mm. For example, L1 can be 2mm, 2.5mm, 3.2mm, 3.5mm or 4mm.

[0109] In the above scheme, by further narrowing the range of the width of the first section 51 covering the tab 232, the ability to balance the stability of the tab 232 and improve the cracking phenomenon of the tab 232 can be further improved.

[0110] As shown in FIG. 1, in some embodiments, the projection of the welding mark 60 is located within the projection of the second section 52. Figure 8 The projection of the welding mark 60 and the projection of the second section 52 respectively refer to the projection in the direction perpendicular to the welding mark 60. The projection of the welding mark 60 is located within the projection of the second section 52, that is, the welding mark 60 is completely covered by the second section 52, and the entire welding mark 60 can be observed with the naked eye.

[0111] In the above scheme, the entire welding mark 60 can be observed with the naked eye from the outside, and the abnormal detection ability of visual inspection can be further improved.

[0112] In some embodiments, the light transmittance of the second section 52 is greater than or equal to 90%, which can further improve the abnormal detection ability of visual inspection, thereby improving the reliability of the battery monomer.

[0113] In some embodiments, the light transmittance of the second section 52 is greater than or equal to 90%, which can further improve the abnormal detection ability of visual inspection, thereby improving the reliability of the battery monomer.

[0114] In some embodiments, the first segment 51 and / or the third segment 53 has a light transmittance less than or equal to 30%, which can make the first segment 51 and / or the third segment 53 opaque, so that the bonding strength can be improved by coating the first segment 51 and / or the third segment 53 with an opaque adhesive material.

[0115] Figure 11 is a schematic view of the overlap between the second non-second segment and the welding mark in some embodiments of the present application.

[0116] As shown in Figure 11 some embodiments, the third segment 53 has a light transmittance less than or equal to 30%, and the projection of the third segment 53 partially overlaps with the projection of the welding mark 60 in the thickness direction of the tab 232, and the width of the overlap region between the projection of the third segment 53 and the projection of the welding mark 60 is L2, which satisfies: L2≤3mm.

[0117] The projection of the third segment 53 refers to the orthographic projection of the third segment 53 on the end cover 21, and the projection of the welding mark 60 refers to the orthographic projection of the welding mark 60 on the end cover 21. Part of the third segment 53 covers the welding mark 60, and the other part is bonded to the adapter component 25 and / or the end cover 21.

[0118] In some embodiments, the width L2 of the tab 232 of the third segment 53 can be any value less than or equal to 3mm. For example, L2 can be 1mm, 1.5mm, 2.2mm, 2.5mm or 3mm.

[0119] In the above scheme, by limiting the width range of the overlap between the third segment 53 and the welding mark 60, the shielding of the welding mark 60 by the third segment 53 can be reduced, thereby further improving the abnormal detection capability of visual inspection.

[0120] In some embodiments, L2 satisfies: L2≤2mm.

[0121] In some embodiments, the width L2 of the tab 232 of the third segment 53 can be any value less than or equal to 3mm. For example, L2 can be 0.8mm, 1.1mm, 1.6mm, 1.8mm or 2mm.

[0122] In the above scheme, by further reducing the width range of the overlap between the third segment 53 and the welding mark 60, the shielding of the welding mark 60 by the third segment 53 is further reduced.

[0123] Figure 12 is a schematic view of the overlap between the second non-second segment and the welding mark in some embodiments of the present application. Figure 8

[0124] As shown in Figure 12 ​As shown, in some embodiments, the third section 53 has a light transmittance less than or equal to 30%, and a gap between the projection of the third section 53 and the projection of the welding mark 60, which can ensure that the third section 53 does not block the welding mark to some extent, thereby further improving the abnormal detection capability of visual inspection.

[0125] In some embodiments, the distance between the third section 53 and the welding mark 60 is L3, and L3 satisfies: L3≤3mm.

[0126] The third section 53 does not block the welding mark 60, and there is a certain gap between the welding mark, and the welding mark 60 can be fully exposed through the second section 52.

[0127] In some embodiments, the distance between the third section 53 and the welding mark 60 is L3, and L3 satisfies: L3≤3mm.

[0128] In the above scheme, when the third section 53 does not block the welding mark 60, by limiting the distance between the third section 53 and the welding mark 60, the third section 53 can be as firm as possible to paste the root of the tab 232, thereby ensuring the stability of the tab 232 to some extent.

[0129] In some embodiments, L3 satisfies: L3≤2mm.

[0130] In some embodiments, the distance between the third section 53 and the welding mark 60 is L3, and L3 satisfies: L3≤3mm.

[0131] In the above scheme, by further reducing the distance between the third section 53 and the welding mark 60, the stability of the tab 232 is further improved.

[0132] In some embodiments, the light transmittance of the first section 51 and / or the third section 53 is greater than or equal to 80%. By setting the first section 51 and / or the third section 53 to be transparent, the range of visual inspection can be increased.

[0133] Figure 13 is Figure 9 a magnified schematic view of the C part in FIG.

[0134] As Figure 13 shown, in some embodiments, the edge of the third section 53 exceeds the side of the tab 232 away from the main body part 231.

[0135] The edge of the third section 53 exceeds the outer edge of the tab 232, so that the third section 53 can completely cover the side of the tab 232 away from the main body 231 and bond it.

[0136] In the above scheme, by making the edge of the third section 53 exceed the side of the tab 232 away from the main body 231, it can be ensured to some extent that the third section 53 can cover the end of the tab 232 and stably bond it.

[0137] Figure 14 is another part of the side view of the battery cell in some embodiments of the present application.

[0138] As shown in Figure 14 In some embodiments, the main body 231 includes a side surface 236 and an end surface 237 connected to each other, the tab 232 is arranged on the end surface 237, and part of the first section 51 is attached to the side surface 236 of the main body 231.

[0139] Part of the first section 51 is attached to the side surface 236, and the other part is bent to the end surface 237 to attach the root of the tab 232, and part of the first section 51 is attached to the end surface 237 of the main body 231.

[0140] In the above scheme, by attaching part of the first section 51 to the side surface 236 of the main body 231, the bonding firmness of the first adhesive tape 50 can be improved.

[0141] In some embodiments, in a direction perpendicular to the end surface 237, the width of the first section 51 covering the side surface 236 is L4, and L4 satisfies: 1mm≤L4≤20mm.

[0142] In the above scheme, by limiting the width range of the first section 51 covering the side surface 236 of the main body 231, the bonding firmness of the first adhesive tape 50 can be improved, and material waste can be reduced and cost can be reduced.

[0143] In the above scheme, by limiting the width range of the first section 51 covering the side surface 236 of the main body 231, the bonding firmness of the first adhesive tape 50 can be improved, and material waste can be reduced and cost can be reduced.

[0144] In some embodiments, L4 satisfies: 8mm≤L4≤15mm.

[0145] In the above scheme, by limiting the width range of the first section 51 covering the side surface 236 of the main body 231, the bonding firmness of the first adhesive tape 50 can be improved, and material waste can be reduced and cost can be reduced.

[0146] In the above scheme, by further reducing the width range of the first section 51 covering the side surface 236 of the main body 231, the adhesion firmness of the first adhesive tape 50 and the cost are further considered.

[0147] Figure 15 is a partial side view of a battery cell according to some embodiments of the present application.

[0148] As shown in Figure 15 In some embodiments, the electrode assembly 23 further comprises a second adhesive tape 70, which is arranged on the side of the tab 232 facing the adapter component 25, and is located between the tab 232 and the end cover 21.

[0149] The structure of the second adhesive tape 70 can be the same as or different from that of the first adhesive tape 50. For example, the second adhesive tape 70 is a blue or black adhesive tape that is entirely non-transparent.

[0150] The second adhesive tape 70 is an insulating member that separates the tab 232 from the end cover 21.

[0151] In the above scheme, by arranging the second adhesive tape 70 on the side of the tab 232 facing the adapter component 25, the tab 232 is insulated and separated from the end cover 21, thereby reducing the short circuit phenomenon.

[0152] In some embodiments, the electrode lead structure 27 comprises an electrode terminal 26 arranged on the housing 24, and an adapter component 25, the tab 232 is welded to the adapter component 25, the adapter component 25 is connected to the electrode terminal 26, and the welding mark 60 is located on the side of the tab 232 away from the adapter component 25.

[0153] In the above scheme, the adapter component 25 can increase the connection area to reduce the contact resistance. In the case of high-current charging and discharging, lower contact resistance can reduce energy loss and improve the charging and discharging efficiency of the battery.

[0154] In some embodiments, the electrode lead structure 27 is an electrode terminal, and the tab 232 is welded to the electrode terminal 26.

[0155] In the above scheme, by directly welding the tab 232 to the electrode terminal 26, the space inside the battery cell 20 can be reduced, thereby improving the energy density of the battery.

[0156] In a second aspect, the embodiments of the present application further provide a battery device 100, comprising the battery cell 20 according to any of the above embodiments.

[0157] In a third aspect, the embodiments of the present application further provide a power consumption device, comprising the battery device 100 described above, and the battery device is used to provide electric energy.

[0158] According to some embodiments of the present application, the present application provides a battery cell 20, a battery cell shell 24, an adapter component 25, an electrode assembly 23 and a first adhesive tape 50, the shell 24 is provided with an electrode drainage structure 27; the electrode assembly 23 comprises a main body part 231 and a tab 232 extending from an end of the main body part 231, the tab 232 is welded with the electrode drainage structure 27 and forms a welding mark 60 on a side of the tab 232 away from the electrode drainage structure 27, the electrode drainage structure 27 is used to conduct current between the electrode assembly 23 and components located outside the shell 24; the first adhesive tape 50 comprises a first section 51, a second section 52 and a third section 53 connected in sequence, the first section 51 is bonded with the main body part 231, at least part of the second section 52 covers the welding mark 60, and the third section 53 is bonded with the tab 232; wherein the light transmittance of the second section 52 is greater than or equal to 80%. The adhesion of the second section 52 is less than the adhesion of the first section 51 and the third section 53 respectively.

[0159] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the specification of the present application. Especially, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized by, The application relates to an electrode assembly and a manufacturing method thereof. The application relates to an electrode assembly and a manufacturing method thereof. The application relates to an electrode assembly and a manufacturing method thereof. The application relates to an electrode assembly and a manufacturing method thereof.

2. The battery cell of claim 1, wherein, The application relates to an electrode assembly and a manufacturing method thereof.

3. The battery cell of claim 2, wherein, The application relates to an electrode assembly and a manufacturing method thereof. The application relates to an electrode assembly and a manufacturing method thereof.

4. The battery cell of claim 3, wherein, The application relates to an electrode assembly and a manufacturing method thereof.

5. The battery cell of claim 4, wherein, The application relates to an electrode assembly and a manufacturing method thereof.

6. The battery cell of claim 1, wherein, The application relates to an electrode assembly and a manufacturing method thereof.

7. The battery cell of any one of claims 1-6, wherein, The application relates to an electrode assembly and a manufacturing method thereof.

8. The battery cell of any one of claims 1-7, wherein, The application relates to an electrode assembly and a manufacturing method thereof.

9. The battery cell of claim 8, wherein, The application relates to an electrode assembly and a manufacturing method thereof.

10. The battery cell of claim 9, wherein, The application relates to an electrode assembly and a manufacturing method thereof.

11. The battery cell of claim 8, wherein, The application relates to an electrode assembly and a manufacturing method thereof.

12. The battery cell of claim 11, wherein, The application relates to an electrode assembly and a manufacturing method thereof.

13. The battery cell of claim 12, wherein, The application relates to an electrode assembly and a manufacturing method thereof.

14. The battery cell of any one of claims 1-7, wherein, The application relates to an electrode assembly and a manufacturing method thereof.

15. The battery cell of any one of claims 1-14, wherein, The application relates to an electrode assembly and a manufacturing method thereof.

16. The battery cell of any one of claims 1-15, wherein, The application relates to an electrode assembly and a manufacturing method thereof.

17. The battery cell of claim 16, wherein, The application relates to an electrode assembly and a manufacturing method thereof.

18. The battery cell of claim 17, wherein, The application relates to an electrode assembly and a manufacturing method thereof.

19. The battery cell of any one of claims 1-18, wherein, The application relates to an electrode assembly and a manufacturing method thereof.

20. The battery cell of any one of claims 1-19, wherein, The application relates to an electrode assembly and a manufacturing method thereof. The application relates to an electrode assembly and a manufacturing method thereof. The application relates to an electrode assembly and a manufacturing method thereof. The application relates to an electrode assembly and a manufacturing method thereof. The application relates to an electrode assembly and a manufacturing method thereof. The application relates to an electrode assembly and a manufacturing method thereof. The application relates to an electrode assembly and a manufacturing method thereof. The application relates to an electrode assembly and a manufacturing method thereof. The application relates to an electrode assembly and a manufacturing method thereof. The application relates to an electrode assembly and a manufacturing method thereof. The application relates to an electrode assembly and a manufacturing method thereof. 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The application relates to an electrode assembly and a manufacturing method thereof. The application relates to an electrode assembly and a manufacturing method thereof. The application relates to an electrode assembly 21. The battery cell of any one of claims 1-19, wherein, The electrode lead structure is an electrode terminal, and the tab is welded to the electrode terminal.

22. A battery device, characterized by A battery cell comprising the battery cell according to any one of claims 1 to 21.

23. An electrical device, comprising: A battery device comprising the battery device according to claim 22, the battery device being configured to provide electrical energy.

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