Battery cell
By covering the insulating paint layer on the outer shell and electrode body of the battery cell, the problem of short circuit between the battery cell and the internal components of the electronic product is solved, and the effect of reducing the risk of short circuit and reducing manufacturing costs is achieved.
Patent Information
- Application Number
- CN202420860430.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-24
- Publication Date
- 2025-02-28
- Estimated Expiration
- 2034-04-24
AI Technical Summary
When traditional battery cells are loaded into electronic products, they are prone to short-circuiting with the components inside electronic products, resulting in damage.
The insulating paint layer is covered with the outer shell and electrode body of the battery cell. The insulating paint layer has excellent insulation properties and has a thickness of between 0.02mm and 0.08mm.
Through the insulating effect of the insulating paint layer, the risk of short-circuiting of the battery cell with other electronic components is effectively reduced, the reliability of the battery cell is improved, and the manufacturing cost and volume are reduced.
Smart Images
Figure CN222546489U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of new energy technology, and in particular to a battery cell. Background Art
[0002] With the increasing attention paid to renewable resources around the world, the research and development of battery technology is of great significance for achieving energy transformation and reducing carbon emissions. Steel-shell batteries and other battery cells are usually lithium-ion batteries with steel as the packaging shell. Steel-shell batteries have the advantages of good physical properties, strong pressure resistance, high energy density, safety and reliability. They are widely used in medical devices, smart wearable devices, mobile power supplies and new energy vehicles. However, for traditional battery cells, when the battery cells are installed inside electronic products, there is a short circuit between the battery cells and the internal components of the electronic products. Summary of the invention
[0003] A technical problem solved by the present application is how to reduce the risk of short circuit of battery cells while saving manufacturing costs.
[0004] A battery cell, comprising:
[0005] A battery cell, the battery cell comprising a shell made of a metal material;
[0006] an electrode body connected to the housing and used for conducting electricity; and
[0007] The insulating paint layer has insulating properties and covers the outer shell and the electrode body at the same time.
[0008] In one embodiment, the thickness of the insulating paint layer is 0.02 mm to 0.08 mm.
[0009] In one embodiment, the thickness of the insulating paint layer is 0.05 mm.
[0010] In one embodiment, the electrode body is connected to the shell by welding.
[0011] In one embodiment, the electrode body includes a positive electrode sheet, the positive electrode sheet includes a positive electrode mounting portion and a positive electrode conduction portion, the outer shell includes a first surface, a second surface and an outer peripheral surface, the first surface and the second surface are located at two ends of the outer shell in the axial direction, the outer peripheral surface is connected between the first surface and the second surface, the positive electrode mounting portion is attached to the first surface, and the positive electrode conduction portion is bent and connected to the positive electrode mounting portion and attached to the outer peripheral surface.
[0012] In one embodiment, the positive electrode conductive portion is disposed to protrude relative to the second surface along the axial direction of the shell.
[0013] In one embodiment, the electrode body also includes a negative electrode sheet, the negative electrode sheet includes a negative electrode mounting portion and a negative electrode conducting portion, the negative electrode mounting portion and the negative electrode conducting portion are bent and connected, the negative electrode mounting portion is attached to the second surface, and the negative electrode conducting portion is protruded relative to the second surface.
[0014] In one embodiment, both the first surface and the second surface are circular, the area of the first surface is larger than the area of the second surface, and the outer peripheral surface is cylindrical.
[0015] In one embodiment, the electrode body includes a positive electrode sheet, the positive electrode sheet has a positive electrode insulating region and a positive electrode conductive region, the area of the positive electrode conductive region is smaller than the area of the positive electrode insulating region, the positive electrode insulating region is connected to the outer shell and covered with the insulating paint layer, and the positive electrode conductive region is used for conduction.
[0016] In one embodiment, the electrode body includes a negative electrode sheet having a negative electrode insulating region and a negative electrode conductive region, the area of the negative electrode conductive region is smaller than the area of the negative electrode insulating region, the negative electrode insulating region is covered with the insulating paint layer, and the negative electrode conductive region is used for conduction.
[0017] A technical effect of an embodiment of the present application is: in view of the fact that the outer shell and the electrode body are covered with an insulating paint layer, and the insulating paint layer has excellent insulating properties, when the battery cell contacts other conductors, the insulating effect of the insulating paint layer can effectively reduce the risk of short circuit between the battery cell and other electronic components, avoid the battery cell and other electronic components from being damaged due to short circuit, thereby improving the reliability of the battery cell during use. In addition, on the one hand, the material cost of the insulating paint layer is relatively low, thereby reducing the manufacturing cost of the battery cell. On the other hand, the insulating paint layer can be formed by spraying or brushing, which can simplify the molding process and molding time of the insulating paint layer, thereby improving the production efficiency of the battery cell, and finally further reducing the manufacturing cost of the battery cell. On the other hand, the thickness of the insulating paint layer is relatively low, which will not have much impact on the volume of the battery cell, thereby realizing the miniaturization design of the battery cell, so the battery cell can reduce the risk of short circuit on the basis of reducing manufacturing cost and volume. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] FIG. 1 is a schematic diagram of a three-dimensional structure of a battery cell provided in an embodiment.
[0019] FIG. 2 is a schematic diagram of the three-dimensional structure of the battery cell shown in FIG. 1 at another viewing angle.
[0020] FIG. 3 is a schematic diagram of a three-dimensional cross-sectional structure of the battery cell shown in FIG. 1 .
[0021] Reference numerals: battery cell 10 , battery cell 100 , housing 110 , first surface 111 , second surface 112 , outer peripheral surface 113 , core body 120 , electrode body 200 , positive electrode sheet 210 , positive electrode mounting portion 211 , positive electrode conductive portion 212 , negative electrode sheet 220 , negative electrode mounting portion 221 , negative electrode conductive portion 222 . DETAILED DESCRIPTION
[0022] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.
[0023] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.
[0024] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.
[0025] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.
[0026] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.
[0027] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.
[0028] 1, 2 and 3, a battery cell 10 provided in an embodiment of the present application includes a battery cell 100, an electrode body 200 and an insulating paint layer. The electrode body 200 is disposed on the battery cell 100, and the insulating paint layer is disposed on the battery cell 100 and the electrode body 200.
[0029] Referring to FIG. 1 , FIG. 2 and FIG. 3 , in some embodiments, the battery cell 100 may include a shell 110 and a core 120. The core 120 is placed in the shell 110, and an electrolyte solution is passed into the shell 110. The core 120 can generate electric energy under the action of the electrolyte solution. The shell 110 can be made of a metal material, for example, the shell 110 can be made of a steel material, so the shell 110 has a conductive property. In order to prevent the shell 110 from contacting other conductive materials and causing a short circuit, an insulating paint layer can be coated on the shell 110. The insulating paint layer has good conductive properties. The shell 110 includes a first surface 111, a second surface 112 and an outer peripheral surface 113. The first surface 111 and the second surface 112 are located at two ends of the shell 110 in the axial direction, that is, the first surface 111 and the second surface 112 are two end surfaces of the shell 110 in the axial direction. Obviously, the first surface 111 and the second surface 112 are arranged at intervals along the axial direction of the shell 110 and face opposite directions. The area of the first surface 111 may be greater than the area of the second surface 112. The first surface 111 may be substantially circular, and the second surface 112 may also be substantially circular. The outer peripheral surface 113 is connected between the first surface 111 and the second surface 112. The outer peripheral surface 113 may be substantially cylindrical, so the first surface 111 and the second surface 112 are planar, and the outer peripheral surface 113 is three-dimensional.
[0030] In some embodiments, the electrode body 200 is connected to the housing 110, and the electrode body 200 can be electrically connected to an external product, so that the battery cell 10 supplies power to the external product through the electrode body 200. The electrode body 200 can include a positive electrode sheet 210 and a negative electrode sheet 220, and obviously, the polarities of the positive electrode sheet 210 and the negative electrode sheet 220 are opposite.
[0031] Referring to FIG. 1 , FIG. 2 and FIG. 3 , in some embodiments, the positive electrode sheet 210 may be made of nickel material, and the positive electrode sheet 210 may include a positive electrode mounting portion 211 and a positive electrode conducting portion 212, and the positive electrode mounting portion 211 and the positive electrode conducting portion 212 are bent and connected to each other, so that the positive electrode mounting portion 211 and the positive electrode conducting portion 212 extend in different directions respectively. The positive electrode mounting portion 211 is attached to the first surface 111 of the housing 110, for example, the positive electrode mounting portion 211 may be attached to the first surface 111 by welding. The positive electrode conducting portion 212 is attached to the outer peripheral surface 113 of the housing 110, for example, the positive electrode conducting portion 212 may be attached to the outer peripheral surface 113 by welding. During the installation process, the positive electrode mounting portion 211 can be first attached to the first surface 111, and the positive electrode conducting portion 212 can be extended from the first surface 111 through the outer peripheral surface 113 to the second surface 112 for a certain length, and then the positive electrode conducting portion 212 can be attached to the outer peripheral surface 113. After the entire positive electrode sheet 210 is installed, the positive electrode conducting portion 212 protrudes a certain length relative to the second surface 112 along the axial direction of the shell 110, that is, from the first surface 111 to the second surface 112, and the positive electrode conducting portion 212 is protruded relative to the second surface 112. The protruding portion of the positive electrode conducting portion 212 relative to the second surface 112 can be electrically connected to an external product, and the positive electrode mounting portion 211 attached to the first surface 111 can be electrically connected to the core 120 in the shell 110 through the shell 110.
[0032] In some embodiments, the positive electrode sheet 210 has a positive electrode insulating region and a positive electrode conductive region. The positive electrode insulating region can be located on the positive electrode mounting portion 211 and the positive electrode conductive portion 212, and the positive electrode conductive region can be located at the tail end of the positive electrode conductive portion 212, thereby making the area of the positive electrode insulating region much larger than the area of the positive electrode conductive region. The positive electrode insulating region is covered with an insulating paint layer, thereby preventing the positive electrode sheet 210 from contacting with an external conductor and causing a short circuit. It can be understood that the insulating paint layer covers the surface of the positive electrode insulating region that is set back from the outer shell 110. The surface of the positive electrode insulating region that is set toward the outer shell 110 may not be covered with an insulating paint layer, so that the positive electrode sheet 210 forms a good electrical connection relationship with the outer shell 110. The positive electrode conductive region is no longer covered with an insulating paint layer, thereby making the positive electrode conductive region form a good electrical connection relationship with external products.
[0033] Referring to FIG. 1 , FIG. 2 and FIG. 3 , in some embodiments, the negative electrode sheet 220 may be made of nickel material, and the negative electrode sheet 220 may include a negative electrode mounting portion 221 and a negative electrode conducting portion 222, and the negative electrode mounting portion 221 and the negative electrode conducting portion 222 are bent and connected to each other, so that the negative electrode mounting portion 221 and the negative electrode conducting portion 222 extend in different directions respectively. The negative electrode mounting portion 221 is attached to the second surface 112 of the housing 110, for example, the negative electrode mounting portion 221 may be attached to the second surface 112 by welding. The negative electrode conducting portion 222 protrudes a certain length relative to the second surface 112 along the axial direction of the housing 110, that is, from the first surface 111 to the direction of the second surface 112, and the negative electrode conducting portion 222 is protruded relative to the second surface 112. The portion of the negative electrode conductive portion 222 protruding relative to the second surface 112 can be electrically connected to an external product, and the negative electrode mounting portion 221 attached to the second surface 112 can be electrically connected to the core 120 in the outer shell 110 through the outer shell 110 .
[0034] In some embodiments, the negative electrode sheet 220 has a negative electrode insulating region and a negative electrode conductive region. The negative electrode insulating region can be located on the negative electrode mounting portion 221 and the negative electrode conductive portion 222, and the negative electrode conductive region can be located at the tail end of the negative electrode conductive portion 222, thereby making the area of the negative electrode insulating region much larger than the area of the negative electrode conductive region. The negative electrode insulating region is covered with an insulating paint layer, thereby preventing the negative electrode sheet 220 from contacting with an external conductor and causing a short circuit. It can be understood that the insulating paint layer covers the surface of the negative electrode insulating region that is set back from the outer shell 110. The surface of the negative electrode insulating region that is set toward the outer shell 110 may not be covered with the insulating paint layer, so that the negative electrode sheet 220 forms a good electrical connection relationship with the outer shell 110. The negative electrode conductive region is no longer covered with an insulating paint layer, thereby making the negative electrode conductive region form a good electrical connection relationship with external products.
[0035] In some embodiments, the insulating paint can be attached to the housing 110 and the electrode body 200 by spraying or brushing. After the insulating paint is cured, the viscous insulating paint is converted into a solid insulating paint layer. In order to improve the adhesion between the insulating paint layer and the housing 110 and the electrode body 200, the surface of the housing 110 and the electrode body 200 can be pre-treated first. The pre-treatment process can be performed in a physical and / or chemical manner to remove dust or stains on the surface of the housing 110 and the electrode body 200, and finally effectively improve the adhesion between the insulating paint layer and the housing 110 and the electrode body 200, so as to prevent the insulating paint layer from detaching from the housing 110 and the electrode body 200 in a short time and losing the insulating performance and causing a short circuit. The value range of the thickness of the insulating paint layer can be 0.02mm to 0.08mm, for example, the specific value of the thickness of the insulating paint layer can be 0.02mm, 0.05mm or 0.08mm, etc. By determining the thickness of the insulating paint layer as above, the thickness of the insulating paint layer can be reduced as much as possible while ensuring that the insulating paint layer has reasonable insulating properties.
[0036] To sum up, given that the outer shell 110 and the electrode body 200 are covered with an insulating paint layer, and the insulating paint layer has excellent insulation properties, when the battery cell 10 contacts other conductors, the insulating effect of the insulating paint layer can effectively reduce the risk of short circuit between the battery cell 10 and other electronic components, avoid damage to the battery cell 10 and other electronic components due to short circuit, thereby improving the reliability of the battery cell 10 during use.
[0037] If PI tape or PET heat shrink film is used to cover the shell 110 and the electrode body 200 for insulation, on the one hand, the manufacturing cost of PI tape or PET heat shrink film is relatively high, thereby increasing the manufacturing cost of the battery cell 10. On the other hand, the shell 110 and the electrode body 200 are three-dimensional structures. In order to ensure the flatness of the coating, a long working time and a covering coating process are required, thereby reducing the production efficiency of the battery cell 10 and ultimately increasing the manufacturing cost of the battery cell 10. On the other hand, the thickness of PI tape or PET heat shrink film is relatively large, thereby increasing the volume of the battery cell 10, which is ultimately not conducive to the miniaturization design of the battery cell 10.
[0038] Referring to FIG. 1 , FIG. 2 and FIG. 3 , for the battery cell 10 in the above embodiment, in view of the insulating paint layer covering the outer shell 110 and the electrode body 200, on the one hand, the material cost of the insulating paint layer is relatively low, thereby reducing the manufacturing cost of the battery cell 10. On the other hand, the insulating paint layer can be formed by spraying or brushing, which can simplify the molding process and molding time of the insulating paint layer, thereby improving the production efficiency of the battery cell 10, and finally further reducing the manufacturing cost of the battery cell 10. On the other hand, the thickness of the insulating paint layer is relatively low, which will not have much impact on the volume of the battery cell 10, thereby realizing the miniaturization design of the battery cell 10. Therefore, the battery cell 10 in the above embodiment meets the important development trend of miniaturization design and low manufacturing cost design.
[0039] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0040] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.
Claims
1. A battery cell, characterized in that: include: A battery cell, the battery cell comprising a shell made of a metal material; An electrode body, the electrode body being connected to the housing and used for conducting electricity; and The insulating paint layer has insulating properties and covers the outer shell and the electrode body at the same time.
2. The battery cell according to claim 1, characterized in that: The thickness of the insulating paint layer is 0.02 mm to 0.08 mm.
3. The battery cell according to claim 2, characterized in that: The thickness of the insulating paint layer is 0.05 mm.
4. The battery cell according to claim 1, characterized in that: The electrode body is connected to the shell by welding.
5. The battery cell according to claim 1, characterized in that: The electrode body includes a positive electrode sheet, and the positive electrode sheet includes a positive electrode mounting portion and a positive electrode conduction portion. The outer shell includes a first surface, a second surface and an outer peripheral surface. The first surface and the second surface are located at two ends of the outer shell in the axial direction. The outer peripheral surface is connected between the first surface and the second surface. The positive electrode mounting portion is attached to the first surface, and the positive electrode conduction portion is bent and connected to the positive electrode mounting portion and attached to the outer peripheral surface.
6. The battery cell according to claim 5, characterized in that: The positive electrode conducting portion is disposed protrudingly relative to the second surface along the axial direction of the shell.
7. The battery cell according to claim 5, characterized in that: The electrode body also includes a negative electrode sheet, which includes a negative electrode mounting portion and a negative electrode conducting portion, the negative electrode mounting portion and the negative electrode conducting portion are bent and connected, the negative electrode mounting portion is attached to the second surface, and the negative electrode conducting portion is protruded relative to the second surface.
8. The battery cell according to claim 5, characterized in that: Both the first surface and the second surface are circular, the area of the first surface is larger than the area of the second surface, and the outer peripheral surface is cylindrical.
9. The battery cell according to claim 1, characterized in that: The electrode body includes a positive electrode sheet having a positive electrode insulating region and a positive electrode conductive region, the area of the positive electrode conductive region is smaller than that of the positive electrode insulating region, the positive electrode insulating region is connected to the shell and covered with the insulating paint layer, and the positive electrode conductive region is used for conduction.
10. The battery cell according to claim 1, characterized in that: The electrode body comprises a negative electrode sheet having a negative electrode insulating region and a negative electrode conductive region, the area of the negative electrode conductive region is smaller than that of the negative electrode insulating region, the negative electrode insulating region is covered with the insulating paint layer, and the negative electrode conductive region is used for conduction.