CN114843644B

CN114843644B - Battery cell, battery and power consumption device

Info

Publication number: CN114843644B
Application number: CN202210781327.1A
Authority: CN
Inventors: 伍强; 胥飞龙; 李后勇; 王伟; 刘济庸; 罗宇
Original assignee: Jiangsu Contemporary Amperex Technology Ltd
Current assignee: Jiangsu Contemporary Amperex Technology Ltd
Priority date: 2022-07-05
Filing date: 2022-07-05
Publication date: 2023-02-28
Anticipated expiration: 2042-07-05
Also published as: CN114843644A

Abstract

The application relates to the technical field of batteries, in particular to a battery monomer, a battery and an electric device, wherein the battery monomer comprises a shell, the shell is provided with an accommodating cavity, the shell comprises a first wall, and one side of the first wall, which is far away from the accommodating cavity, is provided with a base region and an identification region; the first wall is provided with a mark pattern arranged in the mark area, the mark pattern comprises a first sub pattern and a second sub pattern, the second sub pattern is filled in the gap of the first sub pattern, the color depth of the first sub pattern is higher than that of the second sub pattern, and the color depth of the first sub pattern is higher than that of the base area. The battery monomer that this application provided is favorable to improving the success rate of battery monomer identification pattern discernment, is convenient for know each item parameter in the battery monomer manufacturing process and the course of the work more accurately.

Description

Battery cell, battery and power consumption device

Technical Field

The present application relates to the field of battery technologies, and in particular, to a battery cell, a battery, and an electric device.

Background

Batteries are widely used in electronic devices such as mobile phones, notebook computers, battery cars, electric automobiles, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, electric tools, and the like.

In the development of the battery monomer technology, besides improving the performance of the battery monomer, the method provides important basis for the monitoring of the process of the battery monomer, the tracing of the process parameters, the analysis of the whole service life of the process and other parameters, and the related analysis of the performance of the subsequent battery monomer. However, how to accurately track the relevant parameters of the battery cell during the manufacturing and using processes is an urgent problem to be solved by those skilled in the art.

Disclosure of Invention

The embodiment of the application provides a battery monomer, battery and power consumption device, can improve the free identification pattern recognition's of battery success rate, is convenient for track each item data of battery monomer in manufacturing, the course of the work.

In a first aspect, an embodiment of the present application provides a single battery cell, which includes a housing, where the housing has a receiving cavity, and the housing includes a first wall, and a side of the first wall, which is away from the receiving cavity, has a substrate region and a mark region; the first wall is provided with a mark pattern arranged in the mark area, the mark pattern comprises a first sub pattern and a second sub pattern, the second sub pattern is filled in the gap of the first sub pattern, the color depth of the first sub pattern is higher than that of the second sub pattern, and the color depth of the first sub pattern is higher than that of the base area.

According to the single battery provided by the embodiment of the application, the color depth of the first sub-pattern of the identification pattern is higher than that of the second sub-pattern, and the color depth of the first sub-pattern is higher than that of the base region, so that even under the condition that the base region and the identification region are both covered by white electrolyte crystals, the first sub-pattern can be accurately identified due to the fact that the color depth of the first sub-pattern is darker than that of other regions, and the arrangement is favorable for improving the identification success rate of the identification pattern of the single battery, and various parameters in the manufacturing process and the working process of the single battery can be more accurately known.

In some embodiments, the identification pattern includes at least one of a bar code, a two-dimensional code, and text. The arrangement is convenient for writing the information related to the battery cell into the identification pattern, so that the identification pattern can be used as a carrier of the information related to the battery cell.

In some embodiments, the color of the first sub-pattern is black, green, red, purple, or gray. In this way, the color depth of the first sub-pattern layer is higher than that of the second sub-pattern layer, and the color depth of the first sub-pattern layer is higher than that of the base region. The identification of the identification pattern is facilitated.

In some embodiments, the first wall includes a main body portion and a pattern portion, a filling opening is formed on a side of the main body portion facing away from the accommodating cavity, the filling opening covers the identification area, the pattern portion is filled in the filling opening, and the identification pattern is disposed on the pattern portion. In this way, the color and the mechanism of the pattern part are conveniently and specifically arranged according to the color and the structure of the identification pattern, so that the identification pattern is formed on the identification part.

In some embodiments, in the thickness direction of the first wall, the first wall includes a body layer and a pattern layer disposed in the identification area, and the pattern layer is disposed on a side of the body layer facing away from the accommodating cavity; the logo pattern is formed on the pattern layer. Thus, the formation of the identification pattern is facilitated.

In some embodiments, the thickness h of the pattern layer satisfies: h is more than or equal to 20 mu m and less than or equal to 80 mu m. Therefore, the identification pattern can be formed through the laser etching process, so that the production efficiency of the identification pattern preparation process is improved, and the production takt of the battery monomer is shortened.

In some embodiments, the pattern layer is provided with a hollow-out area, the hollow-out area is arranged corresponding to the second sub-pattern along the thickness direction, and the color depth of the pattern layer is higher than that of the body layer. The arrangement is favorable for simplifying the manufacturing process of the identification pattern.

In some embodiments, the pattern layer includes a first sub-portion and a second sub-portion, the first sub-portion is disposed corresponding to the first sub-pattern, the second sub-portion is disposed corresponding to the second sub-pattern, a color depth of the first sub-portion is higher than a color depth of the second sub-portion, and the color depth of the first sub-portion is higher than a color depth of the body layer. So set up, be favorable to keeping the structural integrity of pattern layer, improve the structural stability of identification pattern.

In some embodiments, the pattern layer is applied to the body layer. Therefore, the attaching reliability of the pattern layer and the body layer is guaranteed, the risk that the pattern layer is separated from the body layer is reduced, and the stability of the identification pattern is guaranteed.

In some embodiments, the pattern layer is bonded to the body layer. Therefore, the connection between the pattern layer and the body layer is more convenient and faster.

In some embodiments, the acid resistance of the pattern layer is greater than the acid resistance of the body layer; and/or the pattern layer has an alkali resistance greater than the alkali resistance of the body layer. So set up, be favorable to keeping identification pattern nature stability, reduce because of the unable discernment's of identification pattern risk that causes of electrolyte corruption.

In some embodiments, the pattern layer comprises a varnish layer. Thus, the formation of the identification pattern is facilitated, and the stability of the identification pattern is favorably maintained.

In a second aspect, embodiments of the present application provide a battery including a battery cell for use in any of the embodiments described above.

The battery provided by the embodiment of the application has the same technical effects due to the adoption of the battery cell provided by any one of the above embodiments, and the details are not repeated herein.

In a third aspect, an embodiment of the present application provides an electric device, which includes the battery provided in the foregoing embodiment, where the battery is used to provide electric energy.

The power consumption device provided by the embodiment of the application has the same technical effect due to the adoption of the battery provided by the embodiment of the application, and the details are not repeated.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and it is obvious for a person skilled in the art to obtain other drawings based on the drawings without any creative effort.

FIG. 1 is a schematic structural diagram of a vehicle provided by an embodiment of the present application;

fig. 2 is a schematic structural diagram of a battery provided in an embodiment of the present application;

fig. 3 is a schematic structural diagram of a battery module in a battery provided in an embodiment of the present application;

fig. 4 is a schematic structural diagram of a battery cell provided in an embodiment of the present application;

fig. 5 is a front view of a first wall of a battery cell provided in an embodiment of the present application;

FIG. 6 is an enlarged view of a portion of FIG. 5 at A;

FIG. 7 is a cross-sectional view taken along line B-B of FIG. 5;

FIG. 8 is a schematic cross-sectional view taken along line C-C of FIG. 6 in one embodiment;

FIG. 9 is a schematic cross-sectional view taken along line C-C of FIG. 6 in another embodiment.

In the drawings, the dimensions of the structures are not drawn to scale.

Description of the labeling:

1. a vehicle; 1a, a motor; 1b, a controller;

10. a battery; 11. a first tank portion; 12. a second tank portion;

20. a battery module;

30. a battery cell;

31. a housing; 31a, an accommodating cavity; 311. a housing body; 312. An end cap;

32. an electrode assembly; 321. a main body part; 322. a tab;

33. a first wall; 33a, a base region; 33b, an identification area; 331. a logo pattern; 331a first sub-pattern; 331b, a second sub-pattern; 332. a body portion; 332a, a fill port; 333. a pattern section; 334. a body layer; 335. a pattern layer; 335a and a hollow-out area; 3351. a first sub-section; 3352. a second sub-section;

x, thickness direction.

Detailed Description

Embodiments of the present application will be described in further detail below with reference to the drawings and examples. The following detailed description of the embodiments and the accompanying drawings are provided to illustrate the principles of the application, but are not intended to limit the scope of the application, i.e., the application is not limited to the described embodiments.

In the description of the present application, it is to be noted that, unless otherwise specified, "a plurality" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," and the like, indicate an orientation or positional relationship that is merely for convenience in describing the application and to simplify the description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the application. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. "vertical" is not strictly vertical but is within the tolerance of the error. "parallel" is not strictly parallel but within the tolerance of the error.

Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the specification. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

In the description of the present application, it is also to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present application can be understood as appropriate by one of ordinary skill in the art.

In this application, the battery cell may 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, and the embodiment of the present application is not limited thereto. The battery cell may be a cylinder, a flat body, a rectangular parallelepiped, or other shapes, which is not limited in the embodiments of the present application. The battery cells are generally divided into three types in an encapsulation manner: the cylindrical battery monomer, the square battery monomer and the soft package battery monomer are not limited in the embodiment of the application.

Reference to a battery in embodiments of the present application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in the present application may include a battery module or a battery pack, etc. Batteries generally include a case for enclosing one or more battery cells. The box can avoid liquid or other foreign matters to influence the charging or discharging of battery monomer.

The battery monomer comprises an electrode assembly and electrolyte, wherein the electrode assembly consists of a positive plate, a negative plate and a separator. The single battery mainly depends on metal ions to move between the positive plate and the negative plate to work. The positive plate comprises a positive current collector and a positive active substance layer, wherein the positive active substance layer is coated on the surface of the positive current collector, the current collector which is not coated with the positive active substance layer protrudes out of the current collector which is coated with the positive active substance layer, and the current collector which is not coated with the positive active substance layer is laminated to be used as a positive electrode lug. Taking a lithium ion battery as an example, the material of the positive electrode current collector may be aluminum, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate, or the like. The negative pole piece includes negative pole mass flow body and negative pole active substance layer, and the surface of negative pole mass flow body is scribbled to the negative pole active substance layer, and the mass flow body protrusion in the mass flow body of having scribbled the negative pole active substance layer of not scribbling the negative pole active substance layer is as negative pole utmost point ear after the mass flow body of not scribbling the negative pole active substance layer is range upon range of. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon, silicon, or the like. The material of the separator may be PP, PE, or the like. In addition, the electrode assembly may have a winding structure or a lamination structure, and the embodiment of the present application is not limited thereto.

The inventor scans the identification pattern of the single battery, so as to trace back the parameters of the single battery in the preparation process and the subsequent working process, after the problem that the identification pattern of part of the single battery cannot be scanned normally is found, the structure and the manufacturing process of the single battery are analyzed and researched systematically, and as a result, the single battery needs to be injected with electrolyte into the single battery in the manufacturing process, and in the electrolyte injection process, the electrolyte inevitably has a part to drop into the outer surface of the single battery, and a part of the electrolyte remains in the area where the single battery is provided with the identification pattern. The battery monomer is at the in-process of work, and surface temperature is higher, causes to remain the electrolyte in identification pattern region and produces the crystallization and attach to identification pattern region, and the electrolyte crystallization is similar to white, and identification pattern's partial colour is comparatively close with the colour of electrolyte crystallization, at the in-process of scanning identification pattern, has influenced the normal discernment to identification pattern, causes the phenomenon of scanning identification pattern failure. Therefore, various parameters related to the manufacturing and working processes of the battery cells cannot be accurately obtained.

Based on the above problems discovered by the inventor, the inventor improves the structure of the battery cell, and the technical solution described in the embodiments of the present application is applicable to the battery cell, the battery including the battery cell, and the electric device using the battery.

According to this application embodiment body provided battery monomer includes casing and identification pattern, and the casing has the holding chamber, and the casing includes first wall, and one side that first wall deviates from the holding chamber has base member district and identification area. The mark pattern is arranged in the mark area of the first wall, the mark pattern comprises a first sub-pattern and a second sub-pattern, the second sub-pattern fills a gap between the second sub-pattern and the first sub-pattern, the color depth of the first sub-pattern is higher than that of the second sub-pattern, and the color depth of the first sub-pattern is higher than that of the base area.

The battery monomer that this application embodiment provided, have first sub-pattern and second sub-pattern through the identification pattern, and set up the colour depth of the high second sub-pattern of colour depth of first sub-pattern, and the colour depth of first sub-pattern is higher than the colour depth of base member district, even then there is the electrolyte crystallization on the identification pattern, because the colour of first sub-pattern is higher than the colour depth of other regions, and the electrolyte crystallization is similar to white, then the colour depth of first sub-pattern is higher than the colour depth of electrolyte crystallization, make the identification pattern discern comparatively easily, improve the success rate of battery monomer identification pattern discernment, in order to know battery monomer manufacturing process and each item parameter in the course of the work more accurately.

The electric device can be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy, an electric tool and the like. The vehicle can be a fuel oil vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or a range-extended vehicle and the like; spacecraft include aircraft, rockets, space shuttles, and spacecraft, among others; the electric toys include stationary or mobile electric toys, such as game machines, electric car toys, electric ship toys, electric airplane toys, and the like; the electric power tools include metal cutting electric power tools, grinding electric power tools, assembly electric power tools, and electric power tools for railways, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, electric impact drills, concrete vibrators, and electric planers. The embodiment of the present application does not specifically limit the above-mentioned electric devices.

For convenience of explanation, the following embodiments will be described with an electric device as an example of a vehicle.

As shown in fig. 1, a battery 10 is provided inside a vehicle 1. The battery 10 may be disposed at the bottom or the head or the tail of the vehicle 1. The battery 10 may be used for power supply of the vehicle 1, and for example, the battery 10 may serve as an operation power source of the vehicle 1.

The vehicle 1 may further include a controller 1b and a motor 1a. The controller 1b is used to control the battery 10 to supply power to the motor 1a, for example, for operational power demand at the time of starting, navigation, and traveling of the vehicle 1.

In some embodiments of the present application, the battery 10 may be used not only as an operating power source of the vehicle 1, but also as a driving power source of the vehicle 1, instead of or in part of fuel or natural gas, to provide driving power for the vehicle 1.

Referring to fig. 2, the battery 10 includes a battery cell (not shown in fig. 2). The battery 10 may further include a case for accommodating the battery cells.

The box is used for holding battery monomer, and the box can be various structural style. In some embodiments, the tank may comprise a first tank portion 11 and a second tank portion 12. The first tank portion 11 and the second tank portion 12 are mutually covered. The first case portion 11 and the second case portion 12 together define a receiving space for receiving the battery cells. The second casing part 12 may be a hollow structure with one open end, the first casing part 11 is a plate-shaped structure, and the first casing part 11 covers the open side of the second casing part 12 to form a casing with an accommodating space; the first tank portion 11 and the second tank portion 12 may be both hollow structures with one side open. The open side of the first casing portion 11 covers the open side of the second casing portion 12 to form a casing having an accommodation space. Of course, the first tank portion 11 and the second tank portion 12 may be various shapes, such as a cylinder, a rectangular parallelepiped, and the like.

In order to improve the sealing performance of the connected first box portion 11 and second box portion 12, a sealing member, such as a sealant or a sealing ring, may be disposed between the first box portion 11 and the second box portion 12.

Assuming that the first box portion 11 covers the second box portion 12, the first box portion 11 may also be referred to as an upper box cover, and the second box portion 12 may also be referred to as a lower box body.

In the battery 10, one or more battery cells may be provided. If there are a plurality of battery cells, the plurality of battery cells may be connected in series, in parallel, or in series-parallel. The series-parallel connection means that a plurality of battery monomers are connected in series and in parallel. The plurality of battery cells may be directly connected in series or in parallel or in series-parallel, and then the whole body formed by the plurality of battery cells is accommodated in the case, or the plurality of battery cells may be connected in series or in parallel or in series-parallel to form the battery module 20. The plurality of battery modules 20 are connected in series or in parallel or in series-parallel to form a whole, and are accommodated in the case.

In some embodiments, as shown in fig. 3, fig. 3 is a schematic structural view of the battery module 20 shown in fig. 2. In the battery module 20, there are a plurality of battery cells 30. The plurality of battery cells 30 are connected in series, in parallel, or in series-parallel to form the battery module 20. The plurality of battery modules 20 are connected in series or in parallel or in series-parallel to form a whole, and are accommodated in the case.

In some embodiments, the plurality of battery cells 30 in the battery module 20 may be electrically connected to each other by a bus member, so as to realize parallel connection, series connection or parallel connection of the plurality of battery cells 30 in the battery module 20.

Fig. 4 is an exploded view of the battery cell 30 shown in fig. 3, fig. 5 is a front view of the first wall 33 of the battery cell, and fig. 6 is a partially enlarged view of a portion a of fig. 5.

As shown in fig. 4 to 6, a battery cell 30 provided in the embodiment of the present disclosure includes a case 31, the case 31 has a receiving cavity 31a, the case 31 includes a first wall 33, a side of the first wall 33 facing away from the receiving cavity 31a has a base region 33a and a mark region 33b, the first wall 33 has a mark pattern 331 disposed in the mark region 33b, the mark pattern 331 includes a first sub-pattern 331a and a second sub-pattern 331b, and the second sub-pattern 331b fills gaps of the first sub-pattern 331 a. The color depth of the first sub-pattern 331a is higher than that of the second sub-pattern 331b, and the color depth of the first sub-pattern 331a is higher than that of the base region 33 a.

Optionally, the battery cell 30 further includes an electrode assembly 32, and the electrode assembly 32 is accommodated in the accommodation cavity 31 a. The electrode assembly includes a body portion 321 and tabs 322.

Alternatively, the case 31 may include a case body 311 and an end cap 312, the case body 311 may have a hollow structure with one side open, and the end cap 312 covers the opening of the case body 311 and forms a sealing connection to form a sealed space for accommodating the electrode assembly 32 and the electrolyte.

When assembling the battery cell 30, the electrode assembly 32 may be placed in the case body 311, the end cap 312 may be fitted to the opening of the case body 311, and the electrolyte may be injected into the case 31 through the electrolyte injection port on the end cap 312.

Optionally, the housing 31 may also be used to contain an electrolyte, such as an electrolyte. The housing 31 may take a variety of configurations.

The housing 31 may be in various shapes, such as a cylinder, a rectangular parallelepiped, or the like. The shape of the case 31 may be determined according to the specific shape of the electrode assembly 32. For example, if the electrode assembly 32 has a cylindrical structure, the case 31 may be selected to have a cylindrical structure. If the electrode assembly 32 has a rectangular parallelepiped structure, the case 31 may have a rectangular parallelepiped structure. In fig. 4, the case 31 and the electrode assembly 32 are each exemplarily in a rectangular parallelepiped structure.

The material of the housing 31 may be various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc., and the embodiment of the present invention is not limited thereto.

The electrode assembly 32 accommodated in the case 31 may be one or more. In fig. 4, the number of electrode assemblies 32 accommodated in the case 31 is two.

Optionally, the electrode assembly 32 further includes a positive electrode tab, a negative electrode tab, and a separator. The electrode assembly 32 may be a wound structure formed of a positive electrode tab, a separator, and a negative electrode tab by winding. The electrode assembly 32 may also be a stacked structure formed by a stacking arrangement of a positive electrode tab, a separator, and a negative electrode tab.

The positive electrode tab may include a positive electrode current collector and a positive electrode active material layer. The positive active material layer is coated on the surface of the positive current collector. The negative electrode tab may include a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode current collector. The separator is arranged between the positive pole piece and the negative pole piece and used for separating the positive pole piece from the negative pole piece so as to reduce the risk of short circuit between the positive pole piece and the negative pole piece.

The material of the spacer may be PP (polypropylene) or PE (polyethylene).

The tab 32 of the electrode assembly 32 is divided into a positive tab 32 and a negative tab 32. The positive tab 32 may be a portion of the positive electrode collector that is not coated with the positive active material layer. The negative electrode tab 32 may be a portion of the negative electrode collector that is not coated with the negative electrode active material layer.

Alternatively, the first wall 33 may be a part of the case body 311 of the case 31, or the first wall 33 may be a part of the end cap 312 of the case 31. The method is not limited and can be selected according to actual requirements.

For example, in the embodiment where the battery cell 30 has a square shape, the first wall 33 may be provided as at least a portion of the end cap 312, and in the embodiment where the battery cell 30 has a cylindrical shape, the first wall 33 may be provided as at least a portion of the housing body 311, so that there is a sufficient area for providing the identification region 33b.

Alternatively, the identification pattern 331 may be a bar code, a two-dimensional code, a number, or a letter, etc. The identification pattern 331 is configured to include a first sub-pattern 331a and a second sub-pattern 331b, and the second sub-pattern 331b is configured to fill gaps of the first sub-pattern 331a, the first sub-pattern 331a and the second sub-pattern 331b together form at least a portion of the identification pattern 331, so that the identification pattern 331 is recognized. Of course, the identification pattern 331 may include other portions as long as it can be recognized.

Alternatively, the logo pattern 331 may have a continuous layer structure by arranging the first sub-pattern 331a and the second sub-pattern 331b to have different color depths to form the logo pattern 331. Alternatively, the identification pattern 331 may be configured to have a certain hollow-out area, and visually, the hollow-out area and the non-hollow-out area present different colors, for example, the area corresponding to the second sub-pattern 331b may be configured to be hollow-out in the layer structure related to the identification pattern 331, and thus, the identification pattern 331 may also be formed.

Alternatively, the identification pattern 331 may be a portion of the first wall 33 that is integrally formed with the first wall 33 during the molding of the first wall 33, or the identification pattern 331 may be a separately molded identification region 33b that is attached to the first wall 33.

If the color depth of the first sub-pattern 331a is higher than that of the second sub-pattern 331b, it can be judged by taking the logo pattern 331 as a black-and-white photograph, and if the region in the photograph corresponding to the first sub-pattern 331a is darker than the region in the photograph corresponding to the second sub-pattern 331b, it can be judged that the color depth of the first sub-pattern 331a is higher than that of the second sub-pattern 331 b.

Similarly, the base region 33a and the logo pattern 331 may be photographed as black and white photographs, and the region in the photograph corresponding to the first sub-pattern 331a may be darker than the region in the photograph corresponding to the base region 33a, and it may be determined that the color depth of the first sub-pattern 331a is higher than the color depth of the base region 33 a.

Alternatively, the color depth of different areas may be determined by acquiring images corresponding to the logo pattern 331 and the base area 33a and according to the difference in gray scale of the corresponding images. Specifically, the base area 33a and the mark area 33b may be captured as an image, the image includes a plurality of pixels, and data of each pixel is represented by 8-bit data, that is, each pixel has 256 levels of gray scales from 0 to 255, and the higher the gray scale value is, the higher the corresponding gray scale value is, the higher the color depth of the relevant structure in the corresponding image is. Therefore, in the images of the land region 33a and the mark region 33b, the gray-scale value of each pixel in the image corresponding to the first sub-pattern 331a is higher than the gray-scale value of each pixel in the image corresponding to the second sub-pattern 331b, and it can be determined that the color depth of the first sub-pattern 331a is higher than the color depth of the second sub-pattern 331 b. Similarly, if the gray-scale value of each pixel in the image corresponding to the first sub-pattern 331a is higher than the gray-scale value of each pixel in the image corresponding to the land region 33a, it can be determined that the color depth of the first sub-pattern 331a is higher than the color depth of the land region 33 a.

Alternatively, the first sub-pattern 331a and the second sub-pattern 331b may be the same color or different colors. Illustratively, the colors of both may be set to be the same, the color depth may be adjusted by adjusting the saturation of the color, or both may be set to have different colors.

Similarly, the first sub-pattern 331a and the base region 33a may be the same color or different colors, and may be set to be the same color, the color depth of the first sub-pattern and the base region 33a may be adjusted by adjusting the saturation of the colors, or the first sub-pattern and the base region may be set to have different colors.

It can be understood that setting the color depth of the first sub-pattern 331a to be higher than that of the second sub-pattern 331b and setting the color depth of the first sub-pattern 331a to be higher than that of the base region 33a allows the first sub-pattern 331a to be accurately recognized even if the base region 33a and the marking region 33b are both covered with white electrolyte crystals, since the color depth of the first sub-pattern 331a is darker than that of other regions. Thus, the mark pattern 331 can still be recognized.

Optionally, the identification of the identification pattern 331 of the battery cell 30 may be performed by scanning, or by human eye identification, and is selected according to a specific form of the identification pattern 331, which is not limited herein.

In the battery cell 30 provided in this embodiment of the application, by setting the color depth of the first sub-pattern 331a of the identification pattern 331 to be higher than the color depth of the second sub-pattern 331b, and setting the color depth of the first sub-pattern 331a to be higher than the color depth of the substrate region 33a, even when both the substrate region 33a and the identification region 33b are covered by white electrolyte crystals, because the color depth of the first sub-pattern 331a is darker than the color of other regions, the first sub-pattern 331a can be accurately recognized, and with such a setting, the success rate of recognizing the identification pattern 331 of the battery cell 30 is favorably improved, and each parameter in the manufacturing process and the working process of the battery cell 30 can be more accurately known.

In some embodiments, the identification pattern 331 includes at least one of a bar code, a two-dimensional code, a number, and a letter.

Specifically, an appropriate form of the marker pattern 331 may be selected according to the type of data described in the marker pattern 331. For example, the barcode and the two-dimensional code may record information such as production date of the battery cell 30 or various data parameters in a production process, and may record various parameter information in a working process. And the numbers or characters may record information such as the production date or model number of the battery cell 30.

The identification pattern 331 is configured to include at least one of a bar code, a two-dimensional code, and a character, which facilitates writing information related to the battery cell 30 into the identification pattern 331, so that the identification pattern 331 serves as a carrier of the information related to the battery cell 30.

Alternatively, the words may be numbers, letters, chinese characters, foreign language or symbols, etc. used as carriers for ideas or languages.

The color of the first sub-pattern 331a layer is not limited, and may be black, brown, or gray, or may be red, green, or the like.

In some embodiments, the color of the first sub-pattern 331a is black, green, red, purple, gray, or the like.

Alternatively, the second sub-pattern 331b and the base region 33a may be colored white or silver, respectively, to achieve a higher color depth of the first sub-pattern 331a than the color depth of the second sub-pattern 331b and the base region 33 a. Of course, the second sub-pattern 331b and the substrate region 33a may be set to have a lighter color, so long as the gray scale of the image corresponding to the first sub-pattern 331a is ensured to be higher than the gray scale of the image corresponding to the second sub-pattern 331b and the substrate region 33 a.

This is advantageous in that the color depth of the first sub-pattern 331a is higher than the color depth of the second sub-pattern 331b, and the color depth of the first sub-pattern 331a is higher than the color depth of the land region 33 a. Facilitating recognition of the identification pattern 331.

Alternatively, the identification pattern 331 may be disposed on the outer surface of the first wall 33 facing away from the accommodating cavity 31a and protruding from the outer surface of the first wall 33, or the identification pattern 331 may be disposed flush with the outer surface of the first wall 33. The method is not limited and can be selected according to actual needs.

Fig. 7 shows a schematic sectional structure along B-B in fig. 5.

As shown in fig. 5 and 7, in some embodiments, the first wall 33 includes a main body portion 332 and a pattern portion 333, a filling opening 332a is formed on a side of the main body portion 332 facing away from the accommodating cavity 31a, the filling opening 332a is disposed to cover the identification area 33b, the pattern portion 333 is filled in the filling opening 332a, and the identification pattern 331 is disposed on the pattern portion 333.

Alternatively, the filling port 332a is disposed to cover the identification area 33b, and the edge of the filling port 332a may be disposed flush with the edge of the identification area 33b, or the edge of the filling port 332a is disposed to be spaced apart from the edge of the identification area 33b, and the orthographic projection of the filling port 332a on the identification area 33b covers the identification area 33b.

Alternatively, the filling port 332a may be provided through the body portion 332 in the thickness direction X of the first wall 33, or the filling port 332a may be provided extending along a part of the thickness direction X of the first wall 33.

The pattern part 333 is disposed in the filling opening 332a, the pattern part 333 may be disposed to protrude from the outer surface of the first wall 33, or the outer surface of the pattern part 333 may be flush with the outer surface of the first wall 33, or the pattern part 333 may be completely located in the filling opening 332a and spaced apart from the outer surface of the first wall 33. For example, the surface of the pattern part 333 may be flush with the surface of the first wall 33, so that the surface of the mark region 33b and the surface of the base region 33a are flush, and thus the base region 33a and the mark region 33b may have a smoother surface as a whole, and the risk of scratching other structures is reduced.

Alternatively, the logo pattern 331 may be formed by etching the pattern part 333, or by providing different color depths in regions of the pattern part 333 corresponding to the first sub-pattern 331a and the second sub-pattern 331b, respectively, which is not limited herein.

It can be understood that, a filling opening 332a covering the identification area 33b is formed on a side of the first wall 33 facing away from the accommodating cavity 31a, and the pattern part 333 is filled in the filling opening 332a, so that the color and the structural style of the pattern part 333 are specifically set according to the color and the structure of the identification pattern 331, so as to form the identification pattern 331 on the pattern part 333.

Fig. 8 shows a schematic sectional structure along C-C in fig. 6.

As shown in fig. 6 and 8, in other embodiments, along the thickness direction X of the first wall 33, the first wall 33 includes a body layer 334 and a pattern layer 335 disposed in the identification area 33b, the pattern layer 335 is disposed on a side of the body layer 334 facing away from the receiving cavity 31a, and the identification pattern 331 is formed on the pattern layer 335.

Alternatively, the body layer 334 and the pattern layer 335 may be integrally formed, and the body layer 334 and the pattern layer 335 may be provided with different colors, so as to form the identification pattern 331 on the pattern layer 335 later. Alternatively, after the body layer 334 and the pattern layer 335 are separately molded, the set pattern layer 335 is attached to the body layer 334 by means of adhesion, thermal transfer, or the like.

In embodiments where the body layer 334 and the pattern layer 335 are separately molded, the identification pattern 331 may be formed on the pattern layer 335 and then attached to the body layer 334, or the identification pattern 331 may be formed after the pattern layer 335 is attached to the body layer 334.

The first wall 33 is provided to include a pattern layer 335 and a body layer 334, and the identification pattern 331 is provided to be formed on the pattern layer 335, which is more convenient for the pattern layer 335 to form the identification pattern 331.

In some embodiments, the thickness h of the patterned layer 335 satisfies: h is more than or equal to 20 mu m and less than or equal to 80 mu m.

Alternatively, the thickness h of the pattern layer 335 may be 20 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, or the like.

In this way, after the pattern layer 335 is attached to the body layer 334 by means of adhesion or painting, the identification pattern 331 is formed on the pattern layer 335 by means of laser etching. Thus, the production efficiency of the manufacturing process of the identification pattern 331 can be improved to shorten the tact time of the battery cells 30.

In some embodiments, the pattern layer 335 is provided with a hollow-out region 335a, the hollow-out region 335a is disposed corresponding to the second sub-pattern 331b along the thickness direction X, and a color depth of the pattern layer 335 is higher than a color depth of the body portion 332.

Alternatively, the hollow-out region 335a may be formed by a process of performing laser etching on a region of the pattern layer 335 corresponding to the second sub-pattern 331 b.

The pattern layer 335 is provided with a hollow-out region 335a, and is provided to be corresponding to the second sub-pattern 331b, so that the color corresponding to the second sub-pattern 331b is the color of the substrate region 33a, and thus, it is only necessary to provide the pattern layer 335 with a color depth higher than the color depth of the body layer 334, and the color depth of the first sub-pattern 331a is higher than the color depth of the second sub-pattern 331b, and the color depth of the first sub-pattern 331a is higher than the color depth of the substrate region 33 a. This configuration is advantageous in simplifying the manufacturing process of the logo pattern 331.

Fig. 9 is a schematic sectional view along C-C in fig. 6 in another embodiment.

As shown in fig. 6 and 9, in other embodiments, the pattern layer 335 includes a first sub-portion 3351 and a second sub-portion 3352, the first sub-portion 3351 is disposed corresponding to the first sub-pattern 331a, the second sub-portion 3352 is disposed corresponding to the second sub-pattern 331b, a color depth of the first sub-portion 3351 is higher than a color depth of the second sub-portion 3352, and a color depth of the first sub-portion 3351 is higher than a color depth of the body layer 334.

That is, the pattern layer 335 may be provided in a continuous layer structure throughout, and the logo pattern 331 may be formed by providing the first sub-portion 3351 and the second sub-portion 3352 with different color depths.

Specifically, the first sub-portion 3351 and the second sub-portion 3352 of the pattern layer 335 may have different color depths by etching the corresponding regions of the first sub-portion 3351 and the second sub-portion 3352 and filling the etched regions with materials having the corresponding color depths. Or the first sub-portion 3351 and the second sub-portion 3352 may be integrally formed and have different color depths during the manufacturing process.

It will be appreciated that such an arrangement is beneficial to maintain the structural integrity of the logo pattern 331 and to improve the structural stability of the logo pattern 331.

Alternatively, the pattern layer 335 may be attached to the body layer 334 by a thermal transfer process, an adhesive, or a painting process, among others.

In some embodiments, a pattern layer 335 is applied to the body layer 334.

Alternatively, the pattern layer 335 may be formed by applying a paint, such as paint, to the body layer 334 with a corresponding color depth, and then performing weathering to remove water.

Alternatively, the color depth of the pattern layer 335 may be set to be the same as the color depth of the first sub-portion 3351, and after the pattern layer 335 is entirely coated on the body layer 334, the region of the pattern layer 335 corresponding to the second sub-pattern 331b is removed, and only the region corresponding to the first sub-pattern 331a is remained. Alternatively, coating layers of different color depths are applied to regions of the pattern layer 335 corresponding to the first sub-pattern 331a and the second sub-pattern 331b, respectively.

The pattern layer 335 is coated on the body layer 334, which is beneficial to ensuring the attachment reliability of the pattern layer 335 and the body layer 334, reducing the risk that the pattern layer 335 is separated from the body layer 334, and further ensuring the stability of the identification pattern 331.

In some embodiments, the pattern layer 335 is adhered to the body layer 334.

Optionally, the graphic layer 335 may be a transfer film.

Alternatively, the pattern layer 335 may be adhered to the body layer 334 through a process of thermal transfer, or the pattern layer 335 may be adhered to the body layer 334 through an adhesive glue.

It can be appreciated that the pattern layer 335 is adhered to the body layer 334, and the connection is more convenient and faster.

In some embodiments, the acid resistance of the pattern layer 335 is greater than the acid resistance of the body layer 334.

Set up the acid resistance that pattern layer 335 is greater than body layer 334, more be favorable to guaranteeing pattern layer 335's structural stability, and then guarantee identification pattern 331's stability, reduce the risk that causes identification pattern 331 to be unable to discern because of electrolyte corrodes.

In some embodiments, the pattern layer 335 has a greater alkali resistance than the body layer 334.

So set up, still be favorable to guaranteeing pattern layer 335's structural stability, reduce identification pattern 331 and cause the risk of not being discerned because of the corruption of electrolyte.

In some embodiments, the pattern layer 335 comprises a paint layer.

Alternatively, the patterned layers 335 may be all paint layers, or a portion of the patterned layers 335 may be a paint layer.

It can be appreciated that the paint layer has a certain corrosion resistance, and is easy to brush, and once the painting is completed, the paint layer has stable properties, which is beneficial to maintaining the stability of the identification pattern 331.

Illustratively, a black paint layer may be coated on the body layer 334, and the region corresponding to the second sub-pattern 331b is etched away by etching, so as to expose the color of the body layer 334, while the region corresponding to the first sub-pattern 331a of the paint layer is remained. Thus, the logo pattern 331 can be formed.

The battery 10 provided according to the embodiment of the present application includes the battery cell 30 provided in any one of the above embodiments.

The battery 10 provided in the embodiment of the present application has the same technical effect due to the adoption of the battery cell 30 provided in any one of the above embodiments, and details are not repeated herein.

The power utilization device provided according to the embodiment of the present application includes the battery 10 provided in the above embodiment, and the battery 10 is used for providing electric energy.

The battery 10 provided by the embodiment of the present application, due to the adoption of the battery cell 30 provided by any one of the above embodiments,

while the present application has been described with reference to preferred embodiments, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the present application, and in particular, features shown in the various embodiments may be combined in any manner as long as there is no structural conflict. The present application is not intended to be limited to the particular embodiments disclosed herein but is to cover all embodiments that may fall within the scope of the appended claims.

Claims

1. A battery cell, comprising:

the shell is provided with an accommodating cavity and comprises a first wall, and one side, away from the accommodating cavity, of the first wall is provided with a base area and a mark area;

the electrolyte is accommodated in the accommodating cavity;

the first wall is provided with an identification pattern arranged in the identification area, the identification pattern comprises a first sub-pattern and a second sub-pattern, the second sub-pattern is filled in the gap of the first sub-pattern, the color depth of the first sub-pattern is higher than that of the second sub-pattern, and the color depth of the first sub-pattern is higher than that of the base area;

along the thickness direction of the first wall, the first wall comprises a body layer and a pattern layer arranged in the identification area, and the pattern layer is arranged on one side of the body layer, which is far away from the accommodating cavity; the identification pattern is formed on the pattern layer through an etching process.

2. The battery cell as recited in claim 1 wherein the identification pattern comprises at least one of a bar code, a two-dimensional code, and text.

3. The battery cell according to claim 1, wherein the color of the first sub-pattern is black, green, red, purple, or gray.

4. The battery cell as claimed in claim 1, wherein the first wall includes a body portion and a pattern portion, a filling opening is formed on a side of the body portion facing away from the receiving cavity, the filling opening covers the identification area, the pattern portion is filled in the filling opening, and the identification pattern is disposed on the pattern portion.

5. The battery cell according to claim 1, wherein the thickness h of the pattern layer satisfies: h is more than or equal to 20 mu m and less than or equal to 80 mu m.

6. The battery cell as claimed in claim 1, wherein the pattern layer is provided with a hollowed-out area, the hollowed-out area is disposed corresponding to the second sub-pattern along the thickness direction, and the color depth of the pattern layer is higher than that of the body layer.

7. The battery cell as recited in claim 1 wherein the pattern layer comprises a first sub-portion and a second sub-portion, the first sub-portion being disposed in correspondence with the first sub-pattern and the second sub-portion being disposed in correspondence with the second sub-pattern along the thickness direction, the first sub-portion having a color depth higher than a color depth of the second sub-portion and the first sub-portion having a color depth higher than a color depth of the body layer.

8. The battery cell of claim 1, wherein the pattern layer is applied to the body layer.

9. The battery cell of claim 1, wherein the pattern layer is adhered to the body layer.

10. The battery cell as recited in claim 1 wherein the acid resistance of the pattern layer is greater than the acid resistance of the body layer; and/or the presence of a gas in the gas,

the pattern layer has an alkali resistance greater than that of the body layer.

11. The battery cell of claim 7, wherein the patterned layer comprises a varnish layer.

12. A battery comprising a battery cell according to any one of claims 1 to 11.

13. An electrical device comprising a battery as claimed in claim 12 for providing electrical energy.