Battery monomer, battery device and electric device

Abstract

The utility model provides a battery monomer, a battery device and a power utilization device. The battery cell comprises: an electrode assembly comprising a tab; the end cover assembly comprises a cover body and an insulating part; the insulating part is arranged between the electrode assembly and the cover body, a containing groove is defined by the insulating part, and an observation window is formed in the side wall of the insulating part; the tab comprises a bent part, the bent part is arranged in the accommodating groove, and at least part of orthographic projection of the bent part on the side wall of the insulating part in the first direction and / or the second direction falls in the observation window. According to the battery monomer, the morphology of the tab extending into the insulating part can be observed through the observation window, so that the reject ratio of the battery monomer is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of battery monomers, in particular to a battery monomer, a battery device and an electric device. Background Art

[0002] At present, judging from the development of the market situation, the application of batteries is becoming more and more extensive. Batteries can be power batteries or energy storage batteries.

[0003] The battery includes a battery case and a battery cell. The battery cell is contained in the battery case; the battery cell includes an electrode assembly, and the electrode assembly includes a tab. During the manufacturing process of the battery cell, whether the tab morphology meets the requirements and is not cracked or redundant can reduce the risk of internal short circuits in the battery and lead to battery safety. However, the existing battery cells cannot effectively detect the tab morphology, and the defective rate of the battery cells is high. Utility Model Content

[0004] The battery cell, battery device and power-consuming device of the present application are intended to solve the problem that the existing battery cells cannot effectively detect the morphology of the tabs and the defective rate of the battery cells is high.

[0005] In order to solve the above technical problems, a technical solution adopted in the present application is: to provide a battery cell, including: an electrode assembly, including a pole ear; an end cover assembly, including a cover body and an insulating member; the insulating member is arranged between the electrode assembly and the cover body, and the insulating member is enclosed to form a receiving groove, and the side wall of the insulating member is provided with an observation window; the pole ear includes a bending portion, the bending portion is arranged in the receiving groove, and at least part of the positive projection of the bending portion on the side wall of the insulating member along the first direction and / or the second direction falls within the observation window.

[0006] The above scheme, by opening an observation window on the side wall of the insulating member, and allowing the pole ear to extend into the bending portion of the accommodating groove, at least a part of the positive projection on the side wall of the insulating member along the first direction and / or the second direction falls within the observation window; in this way, the morphology of the pole ear extending into the insulating member can be observed through the observation window to reduce the defective rate of the battery cell.

[0007] In one embodiment, the observation window is a notch opened on the side wall of the insulating member.

[0008] The above scheme directly opens a notch on the side wall of the insulating member as an observation window, and the observation window can be obtained by removing part of the side wall of the insulating member. The operation is simple and quick, and the existing insulating member can be directly used for improvement, which can save costs.

[0009] In one embodiment, the insulating member includes a first side wall and a second side wall arranged opposite to each other along the first direction; and a third side wall and a fourth side wall arranged opposite to each other along the second direction; wherein the observation window is provided on at least one of the first side wall, the second side wall, the third side wall and the fourth side wall.

[0010] The above scheme can detect the shape of the tab through at least one observation window, effectively improving the accuracy of the detection result and reducing the defective rate of the battery cell.

[0011] In one embodiment, the observation window is provided on the first side wall and / or the second side wall; the orthographic projection of the bent portion along the first direction on the side wall of the insulating member is the first orthographic projection; the ratio of the area of ​​the portion of the first orthographic projection falling within the observation window to the area of ​​the entire first orthographic projection is greater than 80%; and / or the observation window is provided on the third side wall and / or the fourth side wall; the orthographic projection of the bent portion along the second direction on the side wall of the insulating member is the second orthographic projection; the ratio of the area of ​​the portion of the second orthographic projection falling within the observation window to the area of ​​the entire second orthographic projection is greater than 80%.

[0012] The above scheme can expose most of the tab through the observation window, so as to detect the morphology of the tab over a larger area as possible, thereby improving the accuracy of the detection result and further reducing the defective rate of the battery cell.

[0013] In one embodiment, it further includes:

[0014] The pole is arranged on the cover; the insulating member is provided with a through hole;

[0015] An adapter having a first end and a second end opposite to each other, wherein the first end is electrically connected to the pole ear, and a portion of the second end extends into the through hole and is electrically connected to the pole; wherein a stopper is also provided on a surface of the insulating member facing the electrode assembly, and the stopper is located in a rotation path of the first end of the adapter rotating around the through hole.

[0016] In the above scheme, by arranging a stopper in the rotation path of the first end of the adapter rotating around the through hole, the stopper can block the rotation process of the adapter to reduce the risk of the adapter rotating to contact the shell of the battery cell.

[0017] In one embodiment, the insulating member includes a first side wall and a second side wall arranged opposite to each other along the first direction, a portion of the first side wall is located in the rotation path of the adapter along the clockwise rotation, and the first side wall located in the rotation path of the adapter along the clockwise rotation also serves as the stop member; and / or a portion of the second side wall is located in the rotation path of the adapter along the counterclockwise rotation, and the second side wall located in the rotation path of the adapter along the counterclockwise rotation also serves as another stop member.

[0018] The above scheme, by making the side wall of the insulating part also serve as a stopper, in the process of preparing the battery cell, it is only necessary to make the observation window avoid the rotation path of the adapter and ensure that the part of the accommodating groove corresponding to the rotation path of the rotating part is not removed; compared with the scheme of adding a stopper, it can not only save costs but also simplify the process.

[0019] In one embodiment, the edge of the positive projection of the pole ear on the side wall of the insulating member along the first direction falls within the observation window or coincides with the edge of the observation window; and / or the edge of the positive projection of the pole ear on the side wall of the insulating member along the second direction falls within the observation window or coincides with the edge of the observation window.

[0020] The above scheme can observe the entire tab through the observation window, so as to more effectively observe the morphology of the tab.

[0021] In one embodiment, the side wall of the insulating member is a transparent side wall, and the transparent side wall constitutes the observation window; or, the observation window is a hollow structure.

[0022] The above scheme can not only visually and effectively observe the shape of the pole ear in the receiving groove, but also the various positions of the side wall of the insulating member can block the rotation process of the adapter, effectively reducing the risk of contact between the adapter and the shell of the battery cell.

[0023] In order to solve the above technical problem, another technical solution adopted in the present application is: to provide a battery device, including the battery cell involved above.

[0024] In order to solve the above technical problems, another technical solution adopted in the present application is: to provide an electrical device, including the battery device involved above.

[0025] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0027] Figure 1 A schematic diagram of the structure of the electrical equipment provided for this application;

[0028] Figure 2 A schematic diagram of the structure of the battery device provided in this application;

[0029] Figure 3 A schematic diagram of disassembling a battery cell provided in one embodiment of the present application;

[0030] Figure 4 for Figure 3 The schematic diagram of the structure of the battery cell after the battery cell is assembled outside the shell;

[0031] Figure 5 A schematic diagram of the structure of an insulating member provided in one embodiment of the present application;

[0032] Figure 6 A schematic diagram of the positions of the adapter and the insulating member provided in one embodiment of the present application;

[0033] Figure 7 It is a structural schematic diagram of the adapter abutting against the stopper after rotation;

[0034] Figure 8 A schematic diagram of the positions of an adapter and an insulating member provided in another embodiment of the present application.

[0035] Description of Reference Numerals

[0036] 1 battery device; 11 battery case; 111 upper shell; 112 lower shell; 12 battery cell; 120 shell; 121 electrode assembly; 1211 pole ear; 122 end cover assembly; 1221 cover; 1222 insulating member; 1223 through hole; 1224 observation window; 123 pole; 124 adapter; 125 stopper; 2 electrical components. DETAILED DESCRIPTION

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

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0039] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0040] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0041] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0042] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0043] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0044] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0045] At present, the application of battery devices is becoming more and more extensive. Battery devices can be power batteries, which are power sources for tools. Power batteries mostly refer to batteries that provide power for electric vehicles, electric trains, electric bicycles, golf carts and other transportation vehicles, as well as aerospace. Of course, battery devices can also be energy storage batteries, which refer to batteries used to store energy from renewable energy sources such as hydropower, thermal power, wind power and solar power stations. With the continuous expansion of the application fields of battery devices, the market demand is also constantly expanding.

[0046] The battery device includes a battery case and a battery cell, and the battery cell is contained in the battery case. The battery cell includes a shell, an electrode assembly, a cover body and a plastic part. The electrode assembly is arranged in the shell. In addition to the steel shell structure of the cover body, an aluminum shell structure with a lighter material is generally used. The cover body can be connected to the shell and cooperate to form a good closed structure. Plastic parts, such as the following plastic, are arranged between the electrode assembly and the cover body. The plastic parts are arranged to form a receiving groove, that is, the plastic has an annular side wall along its circumferential direction, and the annular side wall is arranged to form a receiving groove. In the manufacturing process of the battery cell, due to the extreme folding ear design, part of the ear will be hidden inside the plastic part, that is, it will be located in the receiving groove. In this way, in the process of using manual visual inspection or CCD (charge coupled device camera) camera to visually detect the shape of the ear, the ear will be blocked by the plastic, the visible space is limited, and the shape of the ear cannot be effectively detected, which will cause the outflow of bad battery cells and bring risks to the use of the battery device. Therefore, it is urgent to increase the inspection space of plastic parts to reduce the risk of tab cracking and missed inspection.

[0047] Among them, manual visual inspection refers to the process in which operators strictly follow the SOP to correctly operate and conduct fixed-station inspections on defects that may occur in the battery cell manufacturing process to prevent defective products from flowing out. CCD inspection refers to a semiconductor device that can convert optical images into electrical signals. It is usually used for visual inspection on wire drawing in factories and is gradually replacing manual visual inspection.

[0048] Based on this, an embodiment of the present application provides a battery cell, by opening an observation window on the side wall of the insulating member, and exposing the portion of the pole ear extending into the insulating member through the observation window, so that the battery cell can observe the morphology of the pole ear extending into the insulating member through the observation window, thereby reducing the defective rate of the battery cell.

[0049] The present application is described in detail below with reference to the accompanying drawings and embodiments.

[0050] See also Figure 1 , Figure 1 A schematic diagram of the structure of an electric device provided in the present application. In one embodiment, an electric device is provided, the electric device comprises an electric device 2 and a battery device 1, and the battery device 1 is electrically connected to the electric device 2. The battery device 1 is used to provide electric energy to the electric device so that the electric device 2 can work.

[0051] Electrical equipment can be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys and electric tools, etc. Vehicles can be fuel vehicles, gas vehicles or new energy vehicles, and new energy vehicles can be pure electric vehicles, hybrid vehicles or extended-range vehicles, etc. Spacecraft include airplanes, rockets, space shuttles and spacecrafts, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc.; electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers, etc. For the convenience of explanation, the following embodiments are described by taking the electric equipment as a vehicle as an example.

[0052] The electrical device 2 may be a component or device that can consume electricity; the electrical device 2 may be a controller and an electronic component, etc. The controller may be a central processing unit (CPU), a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.

[0053] In some examples, the electric device may be a vehicle, and the electric device 2 may be a lamp (such as a headlight, a taillight, etc.), a display screen, a dashboard, a control system (such as a controller), etc. The vehicle may also include a frame, and the battery device 1 and the electric device 2 are both mounted on the vehicle body.

[0054] See also Figure 2 , Figure 2A schematic diagram of the structure of the battery device provided in the present application; in one embodiment, a battery device 1 is also provided, and the battery device 1 includes a battery case 11 and a battery cell 12. The battery case 11 includes an upper shell 111 and a lower shell 112; the upper shell 111 and the lower shell 112 define a chamber, and one or more battery cells 12 are accommodated in the chamber; the battery case 11 can protect the battery cell 12 and facilitate the collection of multiple battery cells 12. The shape of the battery case 11 can be specifically set as needed, for example, the shape of the battery case 11 can be cylindrical, rectangular, etc.

[0055] The battery cell 12 may be a secondary battery, which refers to a battery cell 12 that can be continuously used by activating active materials by charging after the battery cell 12 is discharged. The battery cell 12 may include, but is not limited to, 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 metal hydride battery, a nickel cadmium battery, a lead storage battery, and the like.

[0056] See also Figures 3 to 5 , Figure 3 A schematic diagram of disassembling a battery cell provided in one embodiment of the present application; Figure 4 for Figure 3 The schematic diagram of the structure of the battery cell after the battery cell is assembled outside the shell; Figure 5 A schematic diagram of the structure of an insulating member provided in an embodiment of the present application. In this embodiment, a battery cell 12 is provided, and the battery cell 12 includes an electrode assembly 121 and an end cover assembly 122. The electrode assembly 121 includes a pole ear 1211. The end cover assembly 122 includes a cover body 1221 and an insulating member 1222; the insulating member 1222 is arranged between the electrode assembly 121 and the cover body 1221, and the insulating member 1222 is enclosed to form a receiving groove, and an observation window 1224 is provided on the side wall of the insulating member 1222. The pole ear 1211 includes a bending portion, the bending portion is arranged in the receiving groove, and at least part of the positive projection of the bending portion on the side wall of the insulating member 1222 along the first direction X and / or the second direction Y falls within the observation window 1224.

[0057] like Figure 3 As shown, the battery cell 12 also includes a shell 120, which has a connected cavity and an installation port. The shell 120 is a hollow structure, and the material of the shell 120 can be metal or plastic; for example, the material of the shell 120 can be copper, iron, aluminum, steel, aluminum alloy, etc. The number of electrode assemblies 121 can be one or more; the electrode assembly 121 is installed in the cavity of the shell 120. The cover 1221 is connected to the shell 120 and covers the installation port.

[0058] The insulating member 1222 is used to insulate and isolate the electrode assembly 121 from the cover body 1221. The insulating member 1222 can be a plastic member. The material of the insulating member 1222 includes plastic or rubber. The insulating member 1222 is recessed in the direction away from the electrode assembly 121 and defines a receiving groove. The insulating member 1222 has a bottom wall and a side wall connected to the circumferential edge of the bottom wall, and the bottom wall and the side wall enclose a receiving groove. The bottom wall of the insulating member 1222 is located between the electrode assembly 121 and the cover body 1221, and the side wall of the insulating member 1222 is arranged on the outside of the electrode assembly 121 in the circumferential direction around the electrode assembly 121.

[0059] The thickness of the insulating member 1222 is generally 3 mm to 8 mm, such as 3 mm, 5 mm or 8 mm. The insulating member 1222 is formed by integral injection molding and has extremely high corrosion resistance and high strength compressive and tensile resistance.

[0060] The electrode assembly 121 may include an anode tab and a cathode tab, and a separator disposed between the anode tab and the cathode tab. During the charge and discharge process of the battery cell 12, active ions (such as lithium ions) are embedded and removed back and forth between the anode tab and the cathode tab. The separator can prevent the anode tab and the cathode tab from short-circuiting to a certain extent, while allowing active ions to pass through. Part of the anode tab and part of the cathode tab extend into the insulating member 1222 respectively; that is, part of the anode tab and part of the cathode tab are respectively located in the receiving groove, and the present application defines the part of the tab 1211 located in the receiving groove as a bending portion.

[0061] It should be noted that the "ear lug 1211" involved in the present application can be an anode ear or a cathode ear. As an example, at least part of the positive projection of the bent portion of the anode ear on the side wall of the insulating member 1222 along the first direction X and / or the second direction Y falls within the observation window 1224. As another example, at least part of the positive projection of the bent portion of the cathode ear on the side wall of the insulating member 1222 along the first direction X and / or the second direction Y falls within the observation window 1224. As another example, at least part of the positive projection of the bent portion of the anode ear on the side wall of the insulating member 1222 along the first direction X and / or the second direction Y falls within the observation window 1224; and at least part of the positive projection of the bent portion of the cathode ear on the side wall of the insulating member 1222 along the first direction X and / or the second direction Y falls within the observation window 1224.

[0062] The following embodiments of the present application are all introduced by taking one of the anode and cathode tabs 1211 as an example. As an example, at least part of the positive projection of the bent portion of the tab 1211 on the side wall of the insulating member 1222 along the first direction X falls within the observation window 1224. As another example, at least part of the positive projection of the bent portion of the tab 1211 on the side wall of the insulating member 1222 along the second direction Y falls within the observation window 1224. As yet another example, at least part of the positive projection of the bent portion of the tab 1211 on the side wall of the insulating member 1222 along the first direction X falls within the observation window 1224; and at least part of the positive projection of the bent portion of the tab 1211 on the side wall of the insulating member 1222 along the second direction Y falls within the observation window 1224.

[0063] It can be understood that the orthographic projection of the bent portion along the first direction X or the second direction Y on the side wall of the insulating member 1222 falls within the observation window 1224 , and the tab 1211 in the receiving groove can be visually viewed through the observation window 1224 .

[0064] The battery cell 12 may further include a safety valve; the safety valve may be disposed on the cover 1221, for example, the safety valve is fixed on the cover 1221, and the safety valve is used to actuate to discharge the internal electrolyte when the internal pressure or temperature of the battery cell 12 reaches a threshold value, so as to reduce the internal pressure or temperature of the battery cell 12. For example, the safety valve may be a temperature-sensitive valve, a pressure-sensitive valve, etc.

[0065] The battery cell 12 provided in the present embodiment has an observation window 1224 opened on the side wall of the insulating member 1222, and the pole ear 1211 is extended into the bending portion of the accommodating groove, so that at least a portion of the positive projection on the side wall of the insulating member 1222 along the first direction X and / or the second direction Y falls within the observation window 1224; in this way, the observation window 1224 is convenient for exposing the portion of the pole ear 1211 hidden inside the insulating member 1222, so that the morphology of the pole ear 1211 extending into the insulating member 1222 can be observed through the observation window 1224, thereby increasing the visible space of the pole ear 1211 available for detection, improving the detection effect of manual visual inspection or CCD detection of the morphology of the pole ear 1211, and reducing the defective rate of the battery cell 12.

[0066] In one embodiment, in combination Figure 5 The observation window 1224 is a notch opened on the side wall of the insulating member 1222 .

[0067] Among them, combined Figure 4 and Figure 5, along the direction of the electrode assembly 121 toward the cover 1221, the notch may extend from the side of the side wall of the insulating member 1222 away from the bottom wall of the receiving tank to the bottom wall of the receiving tank. Alternatively, the notch may extend from the side of the side wall of the insulating member 1222 away from the bottom wall of the receiving tank to a position close to the bottom wall of the receiving tank. Alternatively, the notch may also be a through hole opened on the side wall of the insulating member 1222.

[0068] In this embodiment, a notch is directly opened on the side wall of the insulating member 1222 as an observation window 1224; not only can the morphology of the tab 1211 in the insulating member 1222 be detected through the notch; but in the process of preparing the battery cell 12, the observation window 1224 can be obtained by removing part of the side wall of the insulating member 1222, and the operation is simple and quick; the existing insulating member 1222 can be directly used for improvement, which can save costs.

[0069] In one embodiment, in combination Figure 5 The insulating member 1222 includes a first side wall and a second side wall that are oppositely arranged along a first direction X; and a third side wall and a fourth side wall that are oppositely arranged along a second direction Y; wherein at least one of the first side wall, the second side wall, the third side wall and the fourth side wall is provided with an observation window 1224.

[0070] Combination Figure 5 As an example, observation windows 1224 are provided on both the first side wall and the second side wall to expose both sides of the tab 1211 along the first direction X, so as to detect the morphology of both sides of the tab 1211 along the first direction X. The number of the observation windows 1224 provided on the first side wall and the second side wall can be one, two or more, respectively.

[0071] As another example, both the third side wall and the fourth side wall may be provided with observation windows 1224 to expose both sides of the pole lug 1211 along the second direction Y, so as to detect the morphology of both sides of the pole lug 1211 along the second direction Y. Among them, the number of the observation window 1224 provided on the third side wall and the fourth side wall is one, so as to reduce the shielding of the pole lug 1211 by the side wall of the insulating member 1222. Of course, the number of the observation windows 1224 provided on the third side wall and the fourth side wall may also be two or more.

[0072] As another example, observation windows 1224 are provided on both the first side wall and the second side wall; and observation windows 1224 are also provided on both the third side wall and the fourth side wall. The two sides of the pole lug 1211 along the first direction X and the two sides along the second direction Y are observed through these observation windows 1224, so as to detect the morphology of the pole lug 1211 from different angles, increase the visualization space of the pole lug 1211, and improve the detection effect of the pole lug 1211.

[0073] In this embodiment, by opening an observation window 1224 on at least one of the first side wall, the second side wall, the third side wall and the fourth side wall, the morphology of the tab 1211 can be detected along the first direction X or the second direction Y through at least one observation window 1224, thereby effectively reducing the defective rate of the battery cell 12.

[0074] In one embodiment, an observation window 1224 is provided on the first side wall and / or the second side wall; the orthographic projection of the bent portion along the first direction X on the side wall of the insulating member 1222 is the first orthographic projection; the ratio of the area of ​​the portion of the first orthographic projection falling within the observation window 1224 to the area of ​​the entire first orthographic projection is greater than 80%; and / or an observation window 1224 is provided on the third side wall and / or the fourth side wall; the orthographic projection of the bent portion along the second direction Y on the side wall of the insulating member 1222 is the second orthographic projection; the ratio of the area of ​​the portion of the second orthographic projection falling within the observation window 1224 to the area of ​​the entire second orthographic projection is greater than 80%.

[0075] As an example, observation windows 1224 are respectively provided on the first side wall and the second side wall; and the observation window 1224 on the first side wall and the observation window 1224 on the second side wall are arranged opposite to each other along the first direction X, and the size and shape of the observation window 1224 on the first side wall and the observation window 1224 on the second side wall may also be the same. In this example, the ratio of the area of ​​the portion of the first orthographic projection falling within the observation window 1224 to the area of ​​the entire first orthographic projection may be 85%, 90%, 95% or 100%.

[0076] As another example, observation windows 1224 are respectively provided on the third side wall and the fourth side wall; and the observation window 1224 on the third side wall and the observation window 1224 on the fourth side wall are arranged opposite to each other along the second direction Y, and the size and shape of the observation window 1224 on the third side wall and the observation window 1224 on the fourth side wall may also be the same. In this example, the ratio of the area of ​​the portion of the second orthographic projection falling within the observation window 1224 to the area of ​​the entire second orthographic projection may be 85%, 90%, 95% or 100%.

[0077] In this embodiment, by exposing most of the tab 1211 through the observation window 1224 , the morphology of a larger area of ​​the tab 1211 can be detected through the observation window 1224 to improve the accuracy of the detection result and further reduce the defective rate of the battery cell 12 .

[0078] In one embodiment, see Figure 3 , Figure 6 and Figure 7 , Figure 6 A schematic diagram of the positions of the adapter and the insulating member 1222 provided in an embodiment of the present application; Figure 7The schematic diagram is a structural diagram of the adapter abutting against the stopper after rotation; the battery cell 12 also includes a pole 123 and an adapter 124; the pole 123 is arranged on the cover 1221; and a through hole 1223 is provided on the insulating member 1222. The adapter 124 has a first end and a second end opposite to each other, the first end is electrically connected to the pole ear 1211, and a portion of the second end extends into the through hole 1223 to be electrically connected to the pole 123. Among them, a stopper 125 is also provided on the side surface of the insulating member 1222 facing the electrode assembly 121, and the stopper 125 is located in the rotation path of the first end of the adapter 124 rotating around the through hole 1223.

[0079] There are two poles 123 and two adapters 124, and two poles 123 can be arranged on the cover 1221. The two poles 123 are respectively a positive pole and a negative pole, and one pole 123 is connected to one pole lug 1211 through one adapter 124. The adapter 124 includes a pole connection area and a pole lug connection area; the pole connection area of ​​the adapter 124 and the pole 123 on the cover 1221 can be connected by laser welding or the like to provide an overcurrent channel and joint carrying capacity; the pole lug connection area of ​​the adapter 124 and the pole lug 1211 of the electrode assembly 121 can be connected together by ultrasonic welding.

[0080] The stopper 125 may be a protrusion or a convex column or a baffle or other structure provided on the insulating member 1222. The stopper 125 may be optimized in different sizes according to the size of the adapter 124 along the first direction X and the second direction Y, so as to minimize the risk of the adapter 124 overlapping the housing 120 due to the offset of the adapter 124.

[0081] As an example, combining Figure 5 , the length L1 of the observation window 1224 along the second direction Y satisfies formula (1):

[0082] (1) L1=W1+2*S; wherein W1 is the length of the tab 1211 along the second direction Y; S is the offset distance of the tab 1211 relative to the preset position along the second direction Y. The tab 1211 is arranged corresponding to the preset position, and the entire tab extending into the receiving groove can be observed through the observation window 1224. The offset distance S can be less than 20 mm; for example, S is 5 mm, 10 mm, 15 mm or 20 mm, etc. As some examples, the pole lug 1211 has less than 35 layers, and the misalignment distance S is ≤10mm; the pole lug 1211 has 36 to 45 layers, and the misalignment distance S is ≤12mm; the pole lug 1211 has 46 to 55 layers, and the misalignment distance S is ≤14mm; the pole lug 1211 has 56 to 65 layers, and the misalignment distance S is ≤16mm; the pole lug 1211 has 66 to 75 layers, and the misalignment distance S is ≤18mm; the pole lug 1211 has 76 to 85 layers, and the misalignment distance S is ≤20mm.

[0083] In this embodiment, by setting a stopper 125 in the rotation path of the first end of the adapter 124 rotating around the through hole 1223, the rotation process of the adapter 124 can be blocked by the stopper 125 to reduce the risk of the adapter 124 rotating to contact the shell 120 of the battery cell 12.

[0084] In one embodiment, see Figure 7 The insulating member 1222 includes a first side wall and a second side wall that are relatively arranged along the first direction X, a portion of the first side wall is located in the rotation path of the adapter 124 along the clockwise rotation, and the first side wall located in the rotation path of the adapter 124 along the clockwise rotation also serves as a stopper 125; and / or a portion of the second side wall is located in the rotation path of the adapter 124 along the counterclockwise rotation, and the second side wall located in the rotation path of the adapter 124 along the counterclockwise rotation also serves as another stopper 125.

[0085] As an example, see Figure 7 Two observation windows 1224 are arranged at intervals on the first side wall and the second side wall, respectively. The two observation windows 1224 are configured to expose the pole ear 1211 extending into the receiving groove. Part of the first side wall between the two observation windows 1224 arranged at intervals on the first side wall serves as a stopper 125 for the adapter 124 to rotate clockwise, so as to stop the adapter 124 from continuing to rotate clockwise. Part of the second side wall between the two observation windows 1224 arranged at intervals on the second side wall serves as another stopper 125 for the adapter 124 to rotate counterclockwise, so as to stop the adapter 124 from continuing to rotate counterclockwise.

[0086] The length of the two observation windows 1224 on the first side wall and / or the second side wall along the second direction Y is as large as possible and smaller than L1, so as to increase the space of the observation windows 1224 of the insulating member 1222, thereby facilitating the improvement of the crack detection range of the tab 1211.

[0087] The two sides of the stopper 125 along the second direction Y may be arranged obliquely or perpendicularly relative to the bottom wall of the insulating member 1222. The two sides of the stopper 125 along the second direction Y may be straight, arc-shaped, or a combination of straight and arc-shaped. Or one of the two sides of the stopper 125 along the second direction Y may be arranged obliquely relative to the bottom wall of the insulating member 1222, and the other side may be arranged perpendicularly relative to the bottom wall of the insulating member 1222.

[0088] In the present embodiment, by making the side wall of the insulating member 1222 also serve as the stop member 125, in the process of preparing the battery cell 12, it is only necessary to make the observation window 1224 avoid the rotation path of the adapter 124, so that the part of the insulating member 1222 corresponding to the rotation path of the adapter 124 is not removed, that is, it is retained; compared with the solution of adding the stop member 125, it can not only save costs but also simplify the process.

[0089] Of course, in other embodiments, see Figure 8 , Figure 8 A schematic diagram of the positions of the adapter 124 and the insulating member 1222 provided in another embodiment of the present application; Figure 6 to Figure 7 The corresponding embodiment is different in that: if the observation window 1224 is a notch opened on the side wall of the insulating member 1222, the length of the adapter 124 along the second direction Y is long enough, and the side wall of the observation window 1224 along the second direction Y can also serve as a stopper 125 to reduce the risk of the adapter 124 contacting the housing 120. In this embodiment, an observation window 1224 with a larger size along the second direction Y can be formed on the first side wall, and the observation window 1224 exposes most or all of the bent portion of the tab 1211 along the second direction Y. Compared to Figure 6 The insulating member 1222 shown can reduce the number of observation windows 1224 and simplify the process; and increase the visible space of the observation window 1224 to improve the effect of detecting the morphology of the tab 1211.

[0090] In one embodiment, the edge of the orthographic projection of the electrode tab 1211 on the sidewall of the insulating member 1222 along the first direction X falls within the observation window 1224 or coincides with the edge of the observation window 1224 .

[0091] It can be understood that the orthographic projection of the tab 1211 on the side wall of the insulating member 1222 along the first direction X may be smaller than the area of ​​the observation window 1224 , or may be equal to the area of ​​the observation window 1224 .

[0092] In this embodiment, the edge of the positive projection of the pole lug 1211 on the side wall of the insulating member 1222 along the first direction X is made to fall within the observation window 1224 or coincide with the edge of the observation window 1224; thus, the entire pole lug 1211 can be observed through the observation window 1224 to more effectively observe the morphology of the pole lug 1211.

[0093] In one embodiment, the side wall of the insulating member 1222 is a transparent side wall, and the transparent side wall constitutes the observation window 1224; or, the observation window 1224 is a hollow structure.

[0094] The insulating member 1222 may be made of a transparent material. The entire transparent side wall may constitute an observation window 1224. A hollow structure refers to a structure having a plurality of through holes, through which light can pass from one side of the structure to the other side of the structure.

[0095] When the observation window 1224 is a hollow structure, the material of the insulating member 1222 may also be the same as that of the existing plastic member. The hollow structure may be a structure formed by opening a plurality of through holes in a preset area of ​​the side wall of the insulating member 1222 .

[0096] In this embodiment, not only can the shape of the pole ear 1211 in the receiving groove be observed intuitively and effectively, but also the various positions of the side walls of the insulating member 1222 can block the rotation process of the adapter 124, effectively reducing the risk of contact between the adapter 124 and the shell 120 of the battery cell 12.

[0097] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell, characterized in that: include: Electrode assembly, including tabs; An end cap assembly, comprising a cap body and an insulating member; The insulating member is arranged between the electrode assembly and the cover body, and the insulating member encloses a receiving groove, and an observation window is opened on the side wall of the insulating member; the electrode ear includes a bending portion, and the bending portion is arranged in the receiving groove, and at least part of the positive projection of the bending portion on the side wall of the insulating member along the first direction and / or the second direction falls within the observation window.

2. The battery cell according to claim 1, characterized in that: The observation window is a notch opened on the side wall of the insulating member.

3. The battery cell according to claim 2, characterized in that: The insulating member comprises a first side wall and a second side wall disposed opposite to each other along the first direction; and a third side wall and a fourth side wall disposed opposite to each other along the second direction; The observation window is provided on at least one of the first side wall, the second side wall, the third side wall and the fourth side wall.

4. The battery cell according to claim 3, characterized in that: The observation window is provided on the first side wall and / or the second side wall; the orthographic projection of the bent portion along the first direction on the side wall of the insulating member is the first orthographic projection; the ratio of the area of ​​the portion of the first orthographic projection falling within the observation window to the area of ​​the entire first orthographic projection is greater than 80%; and / or The observation window is provided on the third side wall and / or the fourth side wall; the orthographic projection of the bent portion along the second direction on the side wall of the insulating member is the second orthographic projection; the ratio of the area of ​​the portion of the second orthographic projection falling within the observation window to the area of ​​the entire second orthographic projection is greater than 80%.

5. The battery cell according to claim 3 or 4, characterized in that: Also includes: The pole is arranged on the cover; the insulating member is provided with a through hole; The adapter has a first end and a second end opposite to each other, the first end is electrically connected to the pole lug, and a portion of the second end extends into the through hole and is electrically connected to the pole; A stopper is further provided on a surface of one side of the insulating member facing the electrode assembly, and the stopper is located in a rotation path of the first end of the adapter rotating around the through hole.

6. The battery cell according to claim 5, characterized in that: The insulating member includes a first side wall and a second side wall arranged opposite to each other along the first direction, a portion of the first side wall is located in the rotation path of the adapter along the clockwise rotation, and the first side wall located in the rotation path of the adapter along the clockwise rotation also serves as the stop member; and / or a portion of the second side wall is located in the rotation path of the adapter along the counterclockwise rotation, and the second side wall located in the rotation path of the adapter along the counterclockwise rotation also serves as another stop member.

7. The battery cell according to claim 6, characterized in that: The edge of the orthographic projection of the pole tab on the side wall of the insulating member along the first direction falls within the observation window or coincides with the edge of the observation window; and / or The edge of the orthographic projection of the pole tab on the side wall of the insulating member along the second direction falls within the observation window or coincides with the edge of the observation window.

8. The battery cell according to claim 1, characterized in that: The side wall of the insulating member is a transparent side wall, and the transparent side wall constitutes the observation window; or, The observation window is a hollow structure.

9. A battery device, characterized in that: The invention comprises a battery cell as claimed in any one of claims 1 to 8.

10. An electrical device, characterized in that: Comprising the battery device as claimed in claim 9.

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