A battery and an electric device

Abstract

A battery and an electric device, the battery comprising an electrode assembly, a first shell, a second shell and a first adhesive layer. The first shell is connected with the second shell, and a containing space is formed between the first shell and the second shell, the electrode assembly is arranged in the containing space, the first shell comprises a first circular truncated cone section and a second circular truncated cone section, the second circular truncated cone section is arranged in the second shell; the first adhesive layer is located between the first shell and the second shell, the first adhesive layer comprises a first section, a second section and a third section, the demarcation point of the first section and the second section is from the bottom of the first adhesive layer to 1 / 4H from the second end surface of the battery, the demarcation point of the second section and the third section is the position where one end of the second shell close to the first end surface is located; the thickness of the first section, the thickness of the second section and the thickness of the third section are all different. The first adhesive layer fills the gap between the first shell and the second shell, and improves the sealing performance of the battery.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electrochemical devices, in particular to a battery and an electric device. BACKGROUND

[0002] Due to the advantages of being rechargeable and reusable, secondary batteries such as button batteries are widely used in various electric devices, for example, in portable electric devices. In the related art, a secondary battery usually includes a shell and an electrode assembly arranged in the shell. When the secondary battery is placed in a humid environment, water vapor may enter the shell, which may cause the water vapor to enter the interior of the electrode assembly, thereby possibly causing damage to the electrode assembly or shortening the service life of the electrode assembly, and possibly affecting the product performance of the battery. SUMMARY

[0003] Embodiments of the present application aim to provide a battery and an electric device to improve the sealing performance of the battery and improve the product performance of the battery. The specific technical solutions are as follows:

[0004] The embodiments of the present application provide a battery, which includes an electrode assembly, a first shell and a second shell, the first shell is connected with the second shell, and a containing space is formed between the first shell and the second shell, the electrode assembly is arranged in the containing space, the first shell includes a first circular truncated cone segment and a second circular truncated cone segment, the second circular truncated cone segment is arranged in the second shell, a first adhesive layer is located between the first shell and the second shell, the first adhesive layer includes a first segment, a second segment and a third segment connected in sequence, the first segment and the second segment are divided at a point from the bottom of the first adhesive layer to a position 1 / 4H away from the second end face of the battery, H is the distance between the first end face and the second end face of the battery, the second segment and the third segment are divided at a position where one end of the second shell close to the first end face is located, and the thickness of the first segment, the thickness of the second segment and the thickness of the third segment are all different.

[0005] According to the battery provided by the embodiment of the present application, the first adhesive layer is arranged between the first shell and the second shell to reduce the possibility of electrical connection between the first shell and the second shell. The second frustum segment of the first shell is arranged in the second shell to realize the relative fixation of the first shell and the second shell. The first adhesive layer comprises a first section, a second section and a third section, and the first section, the second section and the third section are arranged at different connection positions of the first shell and the second shell respectively. The thicknesses of the first section, the second section and the third section are different, the first adhesive layer fills the gap between the first shell and the second shell as much as possible, and the possibility of the invasion of external water vapor and the like into the containing space and the damage of the electrode assembly can be reduced, so that the sealing property of the battery can be improved, and the service life and product performance of the battery can be improved.

[0006] In some embodiments, the radius of the lower end surface of the second frustum segment is R1, the radius of the second shell is R2, the wall thickness of the second frustum segment is T1 in the radial direction of the first frustum segment, the second shell is in a cylindrical shape, the thickness of the first section is T2, the thickness of the second section is T3, and the thickness of the third section is T4, wherein T3>(T2+T4) / 2 and T4≥(R2-R1-T1). The thickness T3 of the second section is greater than the average of the thickness T2 of the first section and the thickness T4 of the third section, that is, the thickness of the second section is relatively thick. Since the position of the second section is the main stress position of the first shell and the second shell after the connection of the first shell and the second shell, increasing the thickness of the second section can reduce the deformation rate of the second section, so that the sealing property of the connection position between the first shell and the second shell can be further improved, and the sealing property of the battery and the product performance of the battery can be further improved.

[0007] In some embodiments, the first adhesive layer further comprises a fourth section, and the fourth section at least partially wraps the edge of the second frustum segment and extends into the containing space. In this way, the fourth section can be used to connect the lower edge of the second frustum segment and the second shell, and the fourth section can also be used to improve the sealing property between the second frustum segment and the second shell, reduce the probability of the invasion of water and oxygen and the like into the containing space through the above gap, and improve the sealing property of the battery and the product performance of the battery.

[0008] In some embodiments, the fourth section is in contact with the side surface of the second shell close to the fourth section. In this way, the fourth section fills the gap between the lower edge of the second frustum segment and the second end surface, so that the probability of the invasion of water and oxygen and the like into the containing space from the gap between the second frustum segment and the second end surface and the corrosion of the electrode assembly are reduced, and the sealing property of the battery and the product performance of the battery are further improved.

[0009] In some embodiments, the radius of the lower end surface of the second frustum section is greater than the radius of the lower end surface of the first frustum section. In this way, the second frustum section limits the first shell as a whole, limits the distance of the upward movement of the first shell in the vertical direction, reduces the probability of the upward movement of the first shell being separated from the second shell, and can improve the connection stability of the first shell and the second shell.

[0010] In some embodiments, the thickness of the first section is in the range of 0.08mm to 0.2mm along the radial direction of the first frustum section. In this way, the first adhesive layer can fill the gap between the first shell and the second shell as much as possible, which can reduce the possibility of external water vapor and the like invading the containing space and causing damage to the electrode assembly, thereby improving the sealing performance of the battery, and further improving the service life and product performance of the battery.

[0011] In some embodiments, the radius of the second frustum section is in the range of 4.6mm to 7mm along the radial direction of the first frustum section; and the radius of the first frustum section is in the range of 4.3mm to 6.5mm.

[0012] In some embodiments, the difference between the distance between the first frustum section and the second shell and the distance between the second frustum section and the second shell is in the range of 0.2mm to 0.5mm along the radial direction of the first frustum section.

[0013] In some embodiments, the difference between the height of the first frustum section and the height of the second frustum section is in the range of 3mm to 4mm along the axial direction of the first frustum section.

[0014] In some embodiments, the difference between the length of the third section and the length of the first section is in the range of 2mm to 4mm along the axial direction of the first frustum section.

[0015] In some embodiments, the first adhesive layer covers all surfaces of the first shell and the second shell in contact. In this way, the connection stability between the first shell and the second shell can be further increased, the sealing performance between the first shell and the second shell can be further improved, and the sealing performance and product performance of the battery can be further improved.

[0016] In some embodiments, the first shell and the second shell are connected by snap connection, or the first shell and the second shell are connected by snap connection, or the first shell and the second shell are connected by twist connection. In this way, the connection stability of the first shell and the second shell is high and the connection complexity is low.

[0017] In some embodiments, the electrode assembly comprises a stack, the stack comprising a first conductive layer, a second conductive layer, and a separator layer disposed between the first conductive layer and the second conductive layer, and the electrode assembly further comprises a first tab and a second tab, the first tab being connected to the first conductive layer, and the second tab being connected to the second conductive layer. The separator layer can be used to isolate the positive and negative electrodes and to play an electronic insulation role, and can also be used to ensure that ions in the electrolyte can pass freely to form an electric circuit. The first tab and the second tab are metal conductors that lead the positive and negative electrodes out of the stack, and can complete the charging and discharging of the battery by contacting the positive and negative electrodes on the battery.

[0018] In some embodiments, the first shell and the second shell are connected to the first tab and the second tab, respectively, or the first shell and the second shell are connected to the conductors connected to the first tab and the second tab. Directly connecting the first tab and the second tab to the first shell or the second shell can save space inside the battery and reduce the volume of the battery.

[0019] In some embodiments, the structure of the stack is an axial winding structure.

[0020] In some embodiments, the structure of the stack is a stack structure along a first direction or a stack structure along a second direction, the first direction being perpendicular to the second direction.

[0021] In some embodiments, the material of the first adhesive layer is a high-molecular polymer, and the high-molecular polymer is at least one of rubber, plastic, and resin.

[0022] Embodiments of the second aspect of the application provide a power-using device, which comprises the battery described above.

[0023] In the embodiments of the application, the battery is used to provide electric energy to a power-using device. In the battery included in the power-using device, the first adhesive layer is disposed between the first shell and the second shell to reduce the possibility of electrical connection between the first shell and the second shell. The second frustum segment of the first shell is disposed in the second shell to achieve relative fixation of the first shell and the second shell. The first adhesive layer comprises a first section, a second section, and a third section, wherein the demarcation point between the first section and the second section is from the bottom of the first adhesive layer to a position 1 / 4H away from the second end face of the battery, the demarcation point between the second section and the third section is a position where one end of the second shell close to the first end face is located, the thicknesses of the first section, the second section, and the third section are different, the adhesive layer fills the gap between the first shell and the second shell as much as possible, and the possibility of intrusion of external moisture and the like into the accommodation space and damage to the electrode assembly can be reduced, thereby improving the sealing performance of the battery and further improving the service life and product performance of the battery. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application and the prior art, the accompanying drawings needed to be used in the embodiments and the prior art will be briefly introduced as follows. Obviously, the accompanying drawings in the following description only represent some of the embodiments of the present application.

[0025] Figure 1 A structural schematic diagram of a battery in some embodiments of the present application;

[0026] Figure 2 A sectional view of a battery in some embodiments of the present application;

[0027] Figure 3 A structural schematic diagram of a battery in some embodiments of the present application; Figure 2 An enlarged view of region A in FIG. 6;

[0028] Figure 4 A structural schematic diagram of an electrode assembly in some embodiments of the present application. DETAILED DESCRIPTION

[0029] In order to make the objectives, technical solutions, and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present application.

[0030] The technical solutions in the embodiments of the present application will be described clearly and in detail. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Unless otherwise defined, all the technical and scientific terms used in the present application have the same meanings as those commonly understood by those skilled in the art to which the present application belongs. The terms used in the specification of the present application are only for the purpose of describing the specific embodiments, and are not intended to limit the present application.

[0031] Hereinafter, the embodiments of the present application will be described in detail. However, the present application can be embodied in many different forms, and should not be interpreted as limited to the exemplary embodiments set forth herein. Rather, these exemplary embodiments are provided so that the present application can be thoroughly and completely conveyed to those skilled in the art.

[0032] In addition, for simplicity and clarity, the figures depict the schematic views of various assemblies, layers, or regions in exaggerated proportions. Throughout the specification, like numerals refer to like elements. As used herein, the terms "and / or" and "at least one of" include any and all combinations of one or more of the associated listed items. In addition, it should be understood that if an element A is said to be "connected to" element B, then element A can be directly connected to element B or intervening elements can be present.

[0033] Further, use of "may" when describing embodiments of the application means that one or more embodiments of the application "can" include the recited feature.

[0034] The professional terms used herein are for the purpose of describing the specific embodiments and are not intended to limit the present application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. It should be further understood that the term "comprising" as used in the specification, means that the stated features, numerals, steps, operations, elements, and / or components are present, but does not exclude the presence or addition of one or more other features, numerals, steps, operations, elements, components, and / or combinations thereof.

[0035] Spatially relative terms, such as "upper" and the like, can be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device or apparatus in use or operation in addition to the orientations depicted in the figures. For example, if a device or apparatus in the figures is turned over, elements described as "above" or "up" other elements or features would then be oriented "below" or "down" the other elements or features. Thus, the exemplary term "above" can encompass both an orientation that is above as well as below. It will be understood that, although the terms first, second, third, etc. can be used herein to describe various elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms are used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the exemplary embodiments. In the present application, a first direction can be any one direction in a plane in which a first surface lies.

[0036] Some embodiments of the present application are described in detail below. The following examples and features in the examples can be combined with each other in the case of no conflict.

[0037] To improve the service life of the battery and the product performance, the embodiments of the present application provide a battery and an electric device. The battery is used to provide electric energy to the electric device. The battery includes, but is not limited to, a button cell and the like.

[0038] An embodiment of the first aspect of this application provides a battery 10, such as Figures 1 to 3 As shown, the battery 10 includes an electrode assembly 1, a first housing 2, a second housing 3, and a first adhesive layer 4. The first housing 2 and the second housing 3 are connected by the first adhesive layer 4, and a receiving space 20 is formed between the first housing 2 and the second housing 3, and the electrode assembly 1 is placed in the receiving space 20.

[0039] The first shell 2 is generally cylindrical and has a hollow structure. The first shell 2 includes a first frustum section 21 and a second frustum section 22. For example... Figure 2 As shown, the first housing 2 includes a first side surface 24 in the shape of an arc and a first end surface 25 connected to the first side surface 24 in the shape of an arc. The side of the first housing 2 opposite to the first end surface 25 also has a first opening.

[0040] In the embodiments of this application, such as Figure 2 and Figure 3 As shown, the axial direction of the first frustum segment 21 and the second frustum segment 22 is defined as the z-direction, that is, the axial direction of the first frustum segment 21 is defined as the z-direction, and the two directions perpendicular to the z-direction are defined as the x-direction and the y-direction, and the x-direction and the y-direction are perpendicular to each other.

[0041] The first side surface 24 includes a first frustum segment 21 and a second frustum segment 22. Specifically, the first side surface 24 includes a first region 241 and a second region 242. The first region 241 is adjacent to the first end face 25 in the z-direction, and the first region 241 is the side surface of the first frustum segment 21; the second region 242 is adjacent to the first region 241 in the z-direction, and the second region 242 is the side surface of the second frustum segment 22. Based on this, the first segment 41 covers part of the second region 242, the second segment 42 covers part of the second region 242, and the third segment 43 covers part of the first region 241.

[0042] In addition, such as Figure 3 As shown, the second frustum segment 22 also includes a third side surface 221 disposed opposite to the second region 242 along the x-direction, and a first bottom surface 222 located between the second region 242 and the third side surface 221 and connecting the second region 242 and the third side surface 221.

[0043] In the embodiments of this application, such as Figure 2 As shown, the first frustum segment 21 and the second frustum segment 22 are connected, and when viewed along the z-direction, the radius of the lower end face of the first frustum segment 21 is different from the radius of the lower end face of the second frustum segment 22.

[0044] In the embodiments of this application, such as Figure 2 and Figure 3As shown, the second shell 3 can be substantially cylindrical, and the second shell 3 is a hollow structure, so that the first shell 2 and the second shell 3 can be connected and jointly form the accommodation space 20. Specifically, as shown in Figure 2 As shown, the second shell 3 also has a second side surface 31 in the shape of an arc surface, and a second end surface 32 connected with the second side surface 31. The second end surface 32 is perpendicular to the z direction, and the second end surface 32 is parallel to the first end surface 25, and the second end surface 32 and the first end surface 25 have a parallel tolerance, and the value of the parallel tolerance is about -5° to +5°. The side opposite to the second end surface 32 of the second shell 3 has a second opening, and the first opening of the first shell 2 is arranged opposite to the second opening of the second shell 3 and connected. The second shell 3 includes a third cylindrical segment 33 and a limiting segment 34 connected. The side wall of the limiting segment 34 is inclined along the z direction. The second circular truncated cone segment 22 of the first shell 2 is placed in the second shell 3, and the side surface of the first circular truncated cone segment 21 is clamped with the limiting segment 34 of the second shell 3, so as to realize the connection of the first shell 2 and the second shell 3. Further, as shown in Figure 3 As shown, the side of the limiting segment 34 away from the third cylindrical segment 33 is inclined along the x direction towards the inside of the second shell 3.

[0045] As shown in Figure 2 and Figure 3 As shown, the second side surface 31 can include a third region 311 and a fourth region 312, the third region 311 is adjacent to the second end surface 32 in the z direction and serves as the side surface of the third cylindrical segment 33, and the fourth region 312 is adjacent to the third region 311 in the z direction and serves as the side surface of the limiting segment 34.

[0046] Further, the material of the first shell 2 and the second shell 3 can be copper, aluminum, silver, nickel and the like, and the material of the first shell 2 and the second shell 3 can also be plastic or rubber and the like, which is not limited in the present application.

[0047] In the embodiment of the present application, the first adhesive layer 4 is arranged between the first shell 2 and the second shell 3. The first adhesive layer 4 includes a first segment 41, a second segment 42 and a third segment 43 connected in sequence, the demarcation point of the first segment 41 and the second segment 42 is at a position from the bottom of the first adhesive layer 4 to a position 1 / 4H away from the second end surface 32 of the battery 10, wherein H is the distance between the first end surface 25 and the second end surface 32 of the battery 10, and the demarcation point of the second segment 42 and the third segment 43 is at a position where the second shell 3 is close to the first end surface 25. The thickness of the first segment 41, the thickness of the second segment 42 and the thickness of the third segment 43 are all different.

[0048] Specifically, the first segment 41 of the first adhesive layer 4 is located between the second frustum segment 22 and the second housing 3, and the first segment 41 covers part of the side surface of the second frustum segment 22. The first segment 41 can be used to connect the second frustum segment 22 and the second housing 3. Further, along Figure 2 In either the x or y direction, the first segment 41 can partially fill the gap between the second frustum segment 22 and the second housing 3. The second segment 42 can be inclined along the z direction to match the shape of the limiting segment 34 and fit against the first housing 2 and the second housing 3. The third segment 43 extends out of the second housing 3 and is attached to the side of the first frustum segment 21. The third segment 43 is used to increase the sealing at the connection between the first housing 2 and the second housing 3.

[0049] In some embodiments, such as Figure 3 As shown, the third segment 43 is also located between the first housing 2 and the second housing 3 along the x direction, and extends out of the second housing 3 along the x direction, and partially covers the limiting segment 34 of the second housing 3. The third segment 43 partially covers the fourth region 312 to increase the sealing between the first housing 2 and the second housing 3, and the stability of the connection between the third segment 43 and the first housing 2 and the second housing 3.

[0050] According to the battery provided in this application embodiment, a first adhesive layer 4 is disposed between the first housing 2 and the second housing 3 to reduce the possibility of electrical connection between the first housing 2 and the second housing 3. The second frustum segment 22 of the first housing 2 is placed inside the second housing 3 to achieve relative fixation between the first housing 2 and the second housing 3. The first adhesive layer 4 is attached to the first bottom surface 222 of the second frustum segment 22 and partially attached to the third side surface 221 of the second frustum segment 22. The third side surface 221 is the surface of the second frustum segment 22 that is opposite to the electrode assembly 1 along the x-direction.

[0051] Specifically, the first adhesive layer 4 includes a first segment 41, a second segment 42, and a third segment 43, which are respectively positioned at different connection points between the first housing 2 and the second housing 3. The first segment 41, the second segment 42, and the third segment 43 have varying thicknesses, allowing the shape of the first adhesive layer 4 to better conform to the side profile of the first housing 2. Therefore, the first adhesive layer 4 can fill the gap between the first housing 2 and the second housing 3 as much as possible, reducing the possibility of external moisture intruding into the containment space and damaging the electrode assembly 1. This improves the sealing performance of the battery 10, thereby enhancing its lifespan and overall product performance.

[0052] Further, the distance between the first circular frustum section 21 and the second shell 3 and the second distance between the second circular frustum section 22 and the second shell 3 are not equal in the z direction, so that the first shell and the second shell meet specific rigidity requirements and facilitate the connection and fixation of the first shell and the second shell. Correspondingly, the thicknesses of the first section 41, the second section 42 and the third section 43 are also not equal, so that the respective sections of the first adhesive layer can conform to the different distances between the first shell and the second shell.

[0053] In some embodiments, as shown in Figure 2 and Figure 3 , the lower end surface radius of the second circular frustum section 22 is R1, the radius of the second shell 3 is R2, the wall thickness of the second circular frustum section 22 is T1 in the radial direction of the first circular frustum section 21, the second shell 3 is cylindrical, the thickness of the first section 41 is T2, the thickness of the second section 42 is T3, and the thickness of the third section 43 is T4, wherein T3>(T2+T4) / 2 and T4≥(R2-R1-T1). In this application, T3 can be the thickness of the thickest part of the second section 42, and T4 can be the thickness of the thickest part of the third section 43. Further, as shown in Figure 3 , the distance between the edge of the second shell 3 closest to the first circular frustum section 21 of the first shell 2 and the side wall of the first circular frustum section 21 is T, specifically, the distance between the edge of the limiting section 34 closest to the first side surface 24 and the first side surface is T, wherein T

[0054] In the embodiments of this application, the wall thickness T1 of the second circular frustum section 22 is the thickness of the side wall of the second circular frustum section 22. The thickness T3 of the second section 42 is greater than the average of the thickness T2 of the first section 41 and the thickness T4 of the third section 43, that is, the thickness of the second section 42 is relatively thick. Since the position of the second section 42 is the main force bearing position of the first shell 2 and the second shell 3 after the connection of the first shell 2 and the second shell 3, increasing the thickness of the second section 42 can reduce the deformation rate of the second section 42, thereby further increasing the sealing performance of the connection between the first shell 2 and the second shell 3 and further increasing the sealing performance of the battery and the product performance of the battery.

[0055] Further, the thickness T4 of the third section 43 is greater than or equal to the difference between the radius R2 of the second shell 3 and the radius R1 of the second circular frustum section 22 minus the wall thickness T1 of the second circular frustum section 22, that is, the third section 43 protrudes from the second shell 3 and is attached to the side surface of the first circular frustum section 21, and the third section 43 is used to increase the sealing performance of the connection between the first shell 2 and the second shell 3, thereby further increasing the sealing performance of the battery and the product performance of the battery.

[0056] In some embodiments, as shown in Figure 3As shown, the first adhesive layer further comprises a fourth section 44, which wraps around the edge of the second frustum section 22 and extends into the accommodation space.

[0057] In some embodiments, as shown in FIG. 1, the fourth section 44 is in contact with the second end surface 32 of the second shell 3. Figure 3 As shown, one side of the fourth section 44 is connected to the first section 41, and the other side at least partially wraps around the lower edge of the second frustum section 22 and extends into the accommodation space. Specifically, the fourth section 44 is attached to the first bottom surface 222 of the second frustum section 22 and to part of the third side surface 221. Thus, the fourth section 44 can partially or completely fill the gap between the lower edge of the second frustum section 22 and the second end surface 32 of the second shell 3 in the z direction. The fourth section 44 can be used to connect the lower edge of the second frustum section 22 to the second shell 3, and can also be used to increase the airtightness between the second frustum section 22 and the second shell 3, reduce the probability of impurities such as water and oxygen entering the accommodation space through the above-mentioned gap, and increase the sealing performance of the battery and the product performance of the battery. In addition, the fourth section is located between the second frustum section of the first shell and the bottom surface of the second shell in the z direction, and can play an insulating role between the first shell and the second shell, reducing the probability of short circuit caused by electrical connection between the first shell and the second shell.

[0058] In some embodiments, as shown in FIG. 1, the fourth section 44 is in contact with the second end surface 32 of the second shell 3. Figure 3 As shown, the fourth section 44 is in contact with the second end surface 32 of the second shell 3.

[0059] In some embodiments, as shown in FIG. 1, the fourth section 44 is in contact with the second end surface 32 of the second shell 3. Figure 2 In some embodiments, as shown in FIG. 1, the fourth section 44 is in contact with the second end surface 32 of the second shell 3.

[0060] In some embodiments, as shown in FIG. 1, the fourth section 44 is in contact with the second end surface 32 of the second shell 3. Figure 3 As shown, the fourth section 44 is in contact with the second end surface 32 of the second shell 3.

[0061] For example, the effects of the battery provided in the present application are further illustrated below in combination with a plurality of comparative examples and embodiments. Different batteries are tested by using cycle tests and high temperature and high humidity storage tests, respectively. In the cycle test, the battery is charged at room temperature with a current of 0.2C (rate), and then discharged to the cut-off voltage; then the battery is charged at a constant current and constant voltage to the limit voltage with a current of 0.2C, and discharged at a constant current to the discharge cut-off voltage with a current of 0.2C, and the initial capacity of the battery is recorded. Then the battery is subjected to 700 cycles of charge and discharge at a current of 0.8C / 1C, and the capacity data of the battery after 700 cycles is recorded, and then the electrode assembly is disassembled for observation. In the high humidity storage test, the battery is charged at room temperature with a current of 0.2C to the charge limit voltage, and discharged at a constant current to the discharge cut-off voltage with a current of 0.2C, and the initial capacity of the battery is recorded. Then the battery is charged at a constant current and constant voltage to the limit voltage with a current of 0.2C, and the battery is placed in a test room at 60 degrees Celsius and 90% humidity, and the test period is 14 days. After the test, the battery is discharged at a constant current of 0.2C to the cut-off voltage, and the remaining capacity of the battery is recorded. The battery is charged at room temperature with a current of 0.2C to the charge limit voltage, and discharged at a constant current to the discharge cut-off voltage with a current of 0.2C, and the recovery capacity of the battery is recorded. The experimental results are shown in Table 1:

[0062] Table 1

[0063]

[0064]

[0065] In Table 1, the treatment measure of Comparative Example 1 is to make the thicknesses of the first section, the second section and the third section of the first adhesive layer in the battery equal, the treatment measure of Comparative Example 2 is to make the thicknesses of the first section, the second section and the third section of the first adhesive layer in the battery equal, and the first adhesive layer has a fourth section wrapping the lower edge of the first shell, and the thicknesses of the first section, the second section and the third section of the first adhesive layer in Example 1 are not equal, and the first adhesive layer has a fourth section wrapping the lower edge of the first shell.

[0066] Comparing Comparative Examples 1 and 2 with Example 1 shows that, in the embodiments of the present application, the thicknesses of the first section, the second section and the third section of the first adhesive layer 4 are not equal, the metal oxide generated in the electrode assembly 1 in the battery 10 is less, the oxidation degree of the electrode assembly 1 is weaker, the sealing performance of the battery 10 is better, and the product performance is better. In addition, after the high temperature and high humidity test, the recovery capacity and the remaining capacity of the battery 10 are significantly increased, and the product performance is better.

[0067] By comparing the comparative example 1 and the comparative example 2 with the example 2, it is shown that in the example, the thicknesses of the first section 41, the second section 42 and the third section 43 in the first adhesive layer 4 are not equal, and the fourth section 44 of the first adhesive layer 4 wraps the lower edge of the first shell 2, and there is no oxide on the electrode assembly 1, and the electrode assembly 1 does not generate oxidation phenomenon, and the sealing performance of the battery 10 is excellent. After the high temperature and high humidity test, the recovery capacity and the residual capacity of the battery 10 are obviously increased, and the product performance is better.

[0068] By comparing the example 1 with the example 2, it is shown that the fourth section 44 of the first adhesive layer 4 wraps the lower edge of the first shell 2, and there is no obvious substance on the diaphragm, which indicates that the electrode assembly does not generate obvious oxidation, and the recovery capacity and the residual capacity of the battery 10 are further improved, and the sealing performance and the product performance of the battery 10 can be further improved.

[0069] In some examples, as shown in Figure 2 The radius R1 of the lower end surface of the second frustum section 22 is greater than the radius R3 of the lower end surface of the first frustum section 21.

[0070] In the example, as shown in Figure 2 and Figure 4 , wherein, Figure 4 is observed from the second end surface to the first end surface along the z direction Figure 2 The schematic diagram of the battery in the example, Figure 2 , Figure 4 In the example, L is the axis of the first frustum section 21 and the second frustum section 22, and can also be the center line of the first frustum section 21 and the second frustum section 22 along the z direction. The radius of the lower end surface of the second frustum section 22 is R1, the radius of the lower end surface of the first frustum section 21 is R3, and the radius of the second shell 3 is R2. R1 is greater than R3, and the second frustum section 22 is arranged in the second shell 3. Since R1 is greater than R3, when the second frustum section 22 is arranged in the second shell 3, the second frustum section 22 can limit the first shell 2 as a whole, limit the distance of the first shell 2 moving upward along the z direction, reduce the probability of the first shell 2 moving upward out of the second shell 3, and improve the connection stability of the first shell 2 and the second shell 3.

[0071] In some examples, along the radial direction of the first frustum section, the thickness of the first section is in the range of 0.08mm to 0.2mm. That is, along the x direction in the example, Figure 2 The thickness of the first section is in the range of 0.08mm to 0.2mm.

[0072] In this embodiment, the thicknesses of the first segment 41, the second segment 42, and the third segment 43 are different, making the shape of the first adhesive layer 4 more closely match the side shape of the first housing 2. Therefore, the first adhesive layer 4 can fill the gap between the first housing 2 and the second housing 3 as much as possible, reducing the possibility of external moisture and other substances intruding into the containment space and causing damage to the electrode assembly 1, thereby improving the sealing performance of the battery 10 and thus improving the service life and product performance of the battery 10.

[0073] In some embodiments, along the radial direction of the first frustum segment 21 ( Figure 2 In the x-direction, the radius of the second frustum segment 22 is in the range of 4.6mm to 7mm; the radius of the first frustum segment 21 is in the range of 4.3mm to 6.5mm.

[0074] In some embodiments, along the radial direction of the first frustum segment 21 ( Figure 2 In the x-direction, the difference between the distance between the first frustum segment 21 and the second shell and the distance between the second frustum segment 22 and the second shell is in the range of 0.2 mm to 0.5 mm.

[0075] In some embodiments, along the axial direction of the first frustum segment 21 ( Figure 2 In the z-direction, the height difference between the first frustum segment 21 and the second frustum segment 22 is within the range of 3mm to 4mm.

[0076] In some embodiments, along the axial direction of the first frustum segment 21 ( Figure 2 In the z-direction, the difference between the length of the third segment and the length of the first segment is in the range of 2mm to 4mm.

[0077] In some embodiments, the first adhesive layer 4 covers all surfaces in contact between the first housing 2 and the second housing 3. This further increases the connection stability between the first housing 2 and the second housing 3, further improves the sealing performance between them, and further enhances the sealing performance and overall performance of the battery 10. Furthermore, the first adhesive layer 4 can fill all gaps between the first housing 2 and the second housing 3 to further improve the sealing performance and overall performance of the battery 10.

[0078] Specifically, the effects of the embodiments of the present application will be described below in combination with a plurality of examples and comparative examples. Different batteries are tested by using cycle test and high temperature and high humidity storage test respectively. In the cycle test, the battery is charged at room temperature with a current of 0.2C, and then discharged to the cut-off voltage; then the battery is charged at a constant current and constant voltage to the limit voltage with a current of 0.2C, and discharged at a constant current to the discharge cut-off voltage with a current of 0.2C, and the initial capacity of the battery is recorded. Then the battery is subjected to 700 cycles at a charge-discharge current of 0.8C / 1C, and the capacity data of the battery after 700 cycles is recorded, and then the electrode assembly is disassembled for observation. In the high humidity storage test, the battery is charged at room temperature with a current of 0.2C to the charge limit voltage, and discharged at a constant current to the discharge cut-off voltage with a current of 0.2C, and the initial capacity of the battery is recorded. Then the battery is charged at a constant current and constant voltage to the limit voltage with a current of 0.2C, and the battery is placed in a test room with a temperature of 60 degrees Celsius and a humidity of 90%, and the test period is 14 days. After the test, the battery is discharged at a constant current of 0.2C to the cut-off voltage, and the remaining capacity of the battery is recorded. The battery is charged at room temperature with a current of 0.2C to the charge limit voltage, and discharged at a constant current to the discharge cut-off voltage with a current of 0.2C, and the recovery capacity of the battery is recorded. The experimental results are shown in Table 2.

[0079]

[0080] In Table 2, in the battery provided by Comparative Example 3, the size relationship of T1, T3 and T2 satisfies the above relationship formula (1), and the size relationship of T4, R2, R1 and T1 does not satisfy the above relationship formula (2); in the battery provided by Comparative Example 4, the size relationship of T1, T3 and T2 does not satisfy the above relationship formula (1), and the size relationship of T4, R2, R1 and T1 satisfies the above relationship formula (2); in the battery provided by Comparative Example 5, the size relationship of T1, T3 and T2 does not satisfy the above relationship formula (1), and the size relationship of T4, R2, R1 and T1 does not satisfy the above relationship formula (2).

[0081] Comparing Comparative Example 3 with Examples 3 to 6 shows that when the size relationship of T4, R2, R1 and T1 satisfies the above relationship formula (2) in the embodiments of the present application, the remaining capacity and the recovery capacity in the battery after high temperature and humidity test are higher, and the capacity of the battery after cycle test is also higher. In addition, after disassembling the electrode assembly for observation, there is no obvious substance on the separator of the battery in Examples 3 to 6, but there is a lot of iron oxide on the separator of the battery in Comparative Example 3, that is, when the size relationship of T4, R2, R1 and T1 satisfies the above relationship formula (2), the sealing performance and product performance of the battery are obviously improved.

[0082] By comparing the comparative example 4 with the examples 3 to 6, it is shown that when the size relationship of T1, T3 and T2 satisfies the above relationship (1) in the examples of the present application, the residual capacity and the recovery capacity in the battery after the high temperature humidity test are higher, and the capacity of the battery after the cycle test is also higher. In addition, after disassembling the electrode assembly for observation, there is no obvious substance on the separator of the battery in the examples 3 to 6, while there is more iron oxide on the separator of the battery in the comparative example 4, that is, when the size relationship of T1, T3 and T2 satisfies the above relationship (1), the sealing performance and the product performance of the battery are obviously improved.

[0083] By comparing the comparative example 5 with the examples 3 to 6, it is shown that when the size relationship of T1, T3 and T2 satisfies the above relationship (1), and the size relationship of T4, R2, R1 and T1 satisfies the above relationship (2) in the examples of the present application, the residual capacity and the recovery capacity in the battery after the high temperature humidity test are higher, and the capacity of the battery after the cycle test is also higher. In addition, after disassembling the electrode assembly for observation, there is no obvious substance on the separator of the battery in the examples 3 to 6, while there is more iron oxide on the separator of the battery in the comparative example 5, that is, when the size relationship of T1, T3 and T2 satisfies the above relationship (1), and the size relationship of T4, R2, R1 and T1 satisfies the above relationship (2), the sealing performance and the product performance of the battery are further improved.

[0084] In some embodiments, the first shell 2 and the second shell 3 are snap connected. Specifically, a protruding snap part and a recessed structure or a protruding snap part and a protruding snap claw part can be respectively arranged on the first shell 2 and the second shell 3 to snap connect the first shell 2 and the second shell 3, which is stable and simple to operate.

[0085] In some embodiments, the first shell 2 and the second shell 3 are snap connected. Specifically, a protruding snap part and a recessed structure or a protruding snap part and a protruding snap claw part can be respectively arranged on the first shell 2 and the second shell 3 to snap connect the first shell 2 and the second shell 3, which is stable and simple to operate. Figure 2 As shown in FIG. 6, the diameter of the lower end surface of the second circular frustum segment 22 can be greater than the diameter of the lower end surface of the first circular frustum segment 21. The second circular frustum segment 22 is pressed downward into the second shell 3, and then the second circular frustum segment 22 is limited by the limiting segment on the second shell 3, so as to realize the snap connection of the first shell 2 and the second shell 3. The first shell 2 and the second shell 3 are directly snap connected, without adding an intermediate part between the first shell 2 and the second shell 3, so as to further reduce the connection complexity of the first shell 2 and the second shell 3.

[0086] In some embodiments, the first shell 2 is screw-connected with the second shell 3. Specifically, threads can be arranged on the side of the first shell 2 in contact with the first adhesive layer 4, and threads can also be arranged on the side of the first adhesive layer 4 in contact with the first shell 2. Alternatively, threads can be arranged on the side of the second shell 3 in contact with the first adhesive layer 4, and threads can also be arranged on the side of the first adhesive layer 4 in contact with the second shell 3, so as to realize screw-connection of the first shell 2 and the second shell 3 through thread cooperation, which is simple in connection process and has high connection stability.

[0087] In some embodiments, as shown in Figure 1 and 2 The electrode assembly 1 includes a laminated body 11, the laminated body 11 including a first conductive layer 111, a second conductive layer 112 and a separator layer 113 arranged between the first conductive layer 111 and the second conductive layer 112, and the electrode assembly 1 further includes a first tab 12 and a second tab 13, the first tab 12 being connected with the first conductive layer 111 and the second tab 13 being connected with the second conductive layer 112.

[0088] In the embodiments of the present application, the first conductive layer 111 and the second conductive layer 112 can be positive conductive layers or negative conductive layers, and the polarities of the first conductive layer 111 and the second conductive layer 112 are opposite. That is, the first conductive layer 111 can be a positive conductive layer or a negative conductive layer, and the second conductive layer 112 can be a positive conductive layer or a negative conductive layer, which is not limited in the present application. The separator layer 113 is arranged between the first conductive layer 111 and the second conductive layer 112, that is, between the positive electrode and the negative electrode of the electrode assembly 1. The separator layer 113 can be used to isolate the positive electrode and the negative electrode to play an electronic insulation role, and on the other hand, the separator layer 113 can be used to ensure that ions in the electrolyte can pass freely to form an electric circuit.

[0089] The first tab 12 and the second tab 13 are metallic conductors that lead out the positive and negative electrodes from the laminate 11. By contacting the positive and negative electrodes of the battery 10, the battery 10 can be charged and discharged. The first tab 12 and the second tab 13 are respectively the positive and negative electrodes, and their polarities are opposite. When the first tab 12 is the positive electrode, the second tab 13 is the negative electrode. The first tab 12 is connected to the positive conductive layer, and the second tab 13 is connected to the negative conductive layer; that is, the first conductive layer 111 is the positive conductive layer, and the second conductive layer 112 is the negative conductive layer. When the first tab 12 is the negative electrode, the second tab 13 is the positive electrode. The first tab 12 is connected to the negative conductive layer, and the second tab 13 is connected to the positive conductive layer; that is, the first conductive layer 111 is the negative conductive layer, and the second conductive layer 112 is the positive conductive layer. This application does not impose any particular restrictions on the materials of the first electrode 12 and the second electrode 13, as long as they can achieve the purpose of this application. For example, the positive electrode material includes at least one of aluminum (Al) or aluminum alloy, and the negative electrode material includes at least one of nickel (Ni), copper (Cu), or copper plated with nickel (Ni-Cu).

[0090] Furthermore, this application does not impose any particular restrictions on the connection method between the first tab 12, the second tab 13 and the first conductive layer 111 and the second conductive layer 112, as long as the purpose of this application can be achieved. For example, at least one of laser welding, ultrasonic welding, resistance welding, or conductive adhesive bonding can be used. This application does not impose any particular restrictions on the direction in which the different tabs are led out, as long as the purpose of this application can be achieved. For example, the directions in which the first tab 12 and the second tab 13 are led out can be in the same direction or in opposite directions.

[0091] In some embodiments, the first housing 2 and the second housing 3 are respectively connected to the first tab 12 and the second tab 13, or the first housing 2 and the second housing 3 are respectively connected to conductors connected to the first tab 12 and the second tab 13. The first tab 12 and the second tab 13 can be electrically connected to the positive and negative terminals of the battery 10 through the first housing 2 and the second housing 3, respectively, to achieve charging and discharging of the battery 10. Alternatively, the first tab 12 and the second tab 13 can be indirectly electrically connected to the positive and negative terminals of the battery 10 through conductors on the first housing 2 and the second housing 3 to achieve charging and discharging of the battery 10. Furthermore, direct contact connection between the first tab 12 and the second tab 13 and the first housing 2 or the second housing 3 can save internal space in the battery 10 and reduce its volume.

[0092] In some embodiments, such as Figure 4 As shown, the structure of the laminate 11 is an axially wound structure. Specifically, the first conductive layer 111, the second conductive layer 112, and the separator layer 113 in the laminate 11 rotate together around the axis C to form an axially wound structure.

[0093] In some embodiments, the structure of the stack 11 is a stack structure along a first direction or a stack structure along a second direction, the first direction being perpendicular to the second direction. Specifically, the first conductive layer 111, the diaphragm layer 113 and the second conductive layer 112 in the stack 11 are sequentially stacked along the first direction or the second direction to form the stack. The first direction and the second direction are both perpendicular to each other in the same plane, and the first direction and the second direction are both perpendicular to the axial direction of the first frustum segment 21.

[0094] In some embodiments, the material of the first adhesive layer 4 is a high polymer, and the high polymer is at least one of rubber, plastic and resin.

[0095] The embodiments of the second aspect of the application provide a power-consuming device, wherein the power-consuming device comprises the battery 10 provided by the embodiments of the first aspect.

[0096] The power-consuming device provided by the embodiments of the application includes, but is not limited to, a notebook computer, a pen input computer, a mobile computer, an electronic book player, a portable telephone, a portable facsimile machine, a portable copying machine, a portable printer, a head-mounted stereo headset, a video recorder, a liquid crystal television, a portable cleaner, a portable CD player, a mini disc, a transceiver, an electronic organizer, a calculator, a memory card, a portable recorder, a radio, a backup power supply, an electric motor, an automobile, a motorcycle, a power-assisted bicycle, a bicycle, an illuminating appliance, a toy, a game machine, a clock, an electric tool, a flash, a camera, a household large storage battery and a lithium ion capacitor, etc.

[0097] In the embodiments of the application, the battery 10 is used to provide electric energy to the power-consuming device. In the battery of the power-consuming device provided by the embodiments of the application, the first adhesive layer 4 is arranged between the first shell 2 and the second shell 3 to reduce the possibility of electrical connection between the first shell 2 and the second shell 3. The second frustum segment 22 of the first shell 2 is arranged in the second shell 3 to realize the relative fixation of the first shell 2 and the second shell 3. The first adhesive layer 4 comprises the first section 41, the second section 42 and the third section 43, and the first section 41, the second section 42 and the third section 43 are arranged at different connection positions of the first shell 2 and the second shell 3, respectively. The thicknesses of the first section 41, the second section 42 and the third section 43 are different, so that the shape of the first adhesive layer 4 is more consistent with the shape of the side surface of the first shell 2. Therefore, the first adhesive layer 4 can fill the gap between the first shell 2 and the second shell 3 as much as possible, and can reduce the possibility of invasion of external water vapor and the like into the accommodation space and damage to the electrode assembly 1, so as to improve the sealing performance of the battery 10, and further improve the service life and product performance of the battery 10.

[0098] The above description is only the preferred embodiment of the present application, and is not used to limit the present application, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A battery, wherein, The battery comprises: an electrode assembly; a first shell and a second shell, the first shell being connected with the second shell, and a containing space being formed between the first shell and the second shell, the electrode assembly being arranged in the containing space, the first shell comprising a first frustum segment and a second frustum segment, the second frustum segment being arranged in the second shell; a first adhesive layer being arranged between the first shell and the second shell, the first adhesive layer comprising a first segment, a second segment and a third segment connected in sequence, a demarcation point between the first segment and the second segment being at a position from a bottom of the first adhesive layer to a position 1 / 4H away from a second end surface of the battery, H being a distance between a first end surface and the second end surface of the battery, a demarcation point between the second segment and the third segment being at a position where an end of the second shell close to the first end surface is located; thicknesses of the first segment, the second segment and the third segment are all different; a radius of a lower end surface of the second frustum segment is greater than a radius of a lower end surface of the first frustum segment; the first adhesive layer covers all surfaces where the first shell and the second shell are in contact, and fills all gaps between the first shell and the second shell; The radius of the lower end surface of the second frustum segment is R1, the radius of the second shell is R2, the wall thickness of the second frustum segment is T1 in the radial direction of the first frustum segment, the second shell is cylindrical, the thickness of the first section is T2, the thickness of the second section is T3, and the thickness of the third section is T4, wherein , and .

2. The battery of claim 1, wherein, the first adhesive layer further comprises a fourth segment, the fourth segment at least partially wrapping an edge of the second frustum segment and extending into the containing space.

3. The battery of claim 2, wherein, the fourth segment is in contact with an inner bottom surface of the second shell.

4. The battery of any one of claims 1 to 3, wherein, in a radial direction of the first frustum segment, the thickness of the first segment is in a range of 0.08mm to 0.2mm.

5. The battery of any one of claims 1 to 3, wherein, in the radial direction of the first frustum segment, the radius of the second frustum segment is in a range of 4.6mm to 7mm; the radius of the first frustum segment is in a range of 4.3mm to 6.5mm.

6. The battery of any one of claims 1 to 3, wherein, in the radial direction of the first frustum segment, a difference between a distance between the first frustum segment and the second shell and a distance between the second frustum segment and the second shell is in a range of 0.2mm to 0.5mm.

7. The battery of any one of claims 1 to 3, wherein, in an axial direction of the first frustum segment, a difference between a height of the first frustum segment and a height of the second frustum segment is in a range of 3mm to 4mm.

8. The battery of any one of claims 1 to 3, wherein, in the axial direction of the first frustum segment, a difference between a length of the third segment and a length of the first segment is in a range of 2mm to 4mm.

9. The battery of claim 1, wherein, the first shell and the second shell are snap-connected, snap-fitted or twist-connected.

10. The battery of claim 1, wherein, the electrode assembly comprises a laminate, the laminate comprising a first conductive layer, a second conductive layer and a separator layer arranged between the first conductive layer and the second conductive layer, the electrode assembly further comprising a first tab and a second tab, the first tab being connected with the first conductive layer, and the second tab being connected with the second conductive layer.

11. The battery of claim 10, wherein, the first shell and the second shell are respectively connected with the first tab and the second tab, or the first shell and the second shell are respectively connected with a conductive body connected with the first tab and the second tab.

12. The battery of claim 10, wherein, The structure of the stack is an axial winding structure.

13. The battery of claim 10, wherein, The structure of the stack is a stack structure in a first direction or a stack structure in a second direction, the first direction being perpendicular to the second direction.

14. The battery of claim 1, wherein, The material of the first adhesive layer is a high molecular polymer, and the high molecular polymer is at least one of rubber, plastic, and resin.

15. An electrical device, comprising: The electric device includes the battery of any one of claims 1 to 14.

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