Lithium ion battery and electronic product

Abstract

The utility model relates to the field of lithium ion batteries, and discloses a lithium ion battery and an electronic product. The battery comprises a steel shell, a shell opening, a side wall surrounding the shell opening and a shell bottom opposite to the shell opening, an annular step is arranged on the side, close to the shell opening, of the inner wall of the side wall, the annular step surrounds the side wall and is in a continuous closed ring shape, a battery cell body is sealed in a cavity of the steel shell, a negative electrode is electrically connected with the steel shell, and the steel shell serves as a negative electrode. The outer edge of the bottom face is attached to the top face of the annular step, metal of the two attaching faces is fused, sealed and combined, the cover plate seals a shell opening, the cover plate is further provided with a positive electrode hole part, the positive electrode end plate is thermally compounded to the outer surface of the cover plate through an insulating glue layer, glue layers on the two surfaces of the insulating glue layer are combined with the cover plate and the positive electrode end plate in a sealed mode, and the insulating glue layer seals the positive electrode hole part. The positive electrode of the battery cell body is connected to the end face, exposed out of the cavity of the steel shell, of the positive electrode hole part, and the positive electrode end plate serves as the positive electrode. By adopting the technical scheme, the heat dissipation performance of the battery is improved, and the battery is easier to disassemble and recycle.

Description

Technical Field

[0001] The utility model relates to the field of battery manufacturing, in particular to a lithium ion battery and an electronic product. Background Art

[0002] As the application of smart wearable products becomes more and more widespread, people's demand for secondary rechargeable batteries is also increasing.

[0003] Soft-pack batteries sealed with aluminum-plastic film are widely used due to their mature preparation process. However, the inventors found in the process of conducting the present invention that soft-pack lithium-ion batteries have the following defects:

[0004] The space at the folded edge in the width direction of the soft-pack battery and the sealing part of the tab cannot be effectively utilized, resulting in low volume energy density of the battery.

[0005] The heat dissipation is poor, especially with the development and promotion of fast charging technology, its heat dissipation effect cannot meet the increasingly higher heat dissipation requirements.

[0006] The positive and negative electrodes of soft-pack lithium-ion batteries are soft ears heat-sealed between aluminum-plastic films, which are poorly replaceable and cannot meet the requirements of the new version of the battery regulation (EU) 2023 / 1542 that the battery must be removable and replaceable. Summary of the invention

[0007] One of the purposes of the embodiments of the utility model is to provide a lithium-ion battery and an electronic product. The adoption of the technical solution is conducive to improving the heat dissipation of the battery and making it easier to disassemble and recycle.

[0008] In a first aspect, this embodiment provides a lithium-ion battery, comprising:

[0009] A steel shell, comprising a shell opening, a side wall surrounding the shell opening, and a shell bottom facing the shell opening.

[0010] An annular step is provided on the inner wall of the side wall near the shell opening, and the annular step surrounds the side wall to form a continuous closed ring.

[0011] The battery core is sealed in the cavity of the steel shell, the negative electrode is electrically connected to the steel shell, and the steel shell is used as the negative electrode.

[0012] The outer edge of the bottom surface of the steel cover plate is in contact with the top surface of the annular step, and the metals of the two surfaces are melted and sealed. The cover plate seals the shell opening.

[0013] A positive electrode hole is also provided on the cover plate, and the positive terminal plate is thermally composited to the inner surface of the cover plate through an insulating adhesive layer, and the adhesive layers on both surfaces of the insulating adhesive layer are sealed and combined with the cover plate and the positive terminal plate. The insulating adhesive layer seals the positive electrode hole, and insulates and separates the cover plate and the positive terminal plate. The positive electrode of the battery cell is connected to the bottom surface of the positive terminal plate, and part of the top surface of the positive terminal plate is exposed from the positive electrode hole to the outside of the steel shell, and the positive terminal plate is used as the positive electrode.

[0014] Optionally, the outer shell formed by the steel shell and the cover plate is a closed figure with a bottom surface and a top surface having three sides.

[0015] Optionally, the bottom surface and the top surface of the outer shell formed by the steel shell and the cover plate are pentagonal.

[0016] Optionally, the insulating adhesive layer has a through hole with a hole diameter equal to or smaller than that of the positive electrode hole portion, the insulating adhesive layer is closely attached to the inner surface of the cover plate, and the through hole is directly opposite to the center of the positive electrode hole portion.

[0017] The positive terminal plate is closely attached to the bottom surface of the insulating rubber layer, and the positive electrode of the battery cell is welded to the bottom surface of the positive terminal plate.

[0018] A boss with a diameter smaller than that of the positive electrode hole is provided on the top surface of the positive terminal plate. The boss passes through the through hole of the insulating rubber layer and is exposed on the outer surface of the cover plate to serve as the positive electrode of the lithium-ion battery.

[0019] The boss is higher than the top surface of the cover plate.

[0020] A liquid injection hole is also provided on one side wall of the steel shell, and a sealing sheet is provided on the liquid injection hole. The bottom surface of the sealing sheet is in contact with the outer surface of the side wall outside the liquid injection hole, and the metal of the contacting surfaces is molten and sealed, and the sealing sheet seals the liquid injection hole.

[0021] Optionally, an explosion-proof portion is further provided on the steel shell and / or the cover plate.

[0022] The wall thickness at the location of the explosion-proof portion is thinner than the wall thickness of the steel shell and / or the cover plate.

[0023] Optionally, the explosion-proof portion is located on the outer surface of the steel shell and / or the cover plate.

[0024] Optionally, the explosion-proof portion is located on the cover plate.

[0025] In a second aspect, an electronic product provided by an embodiment of the utility model includes a power supply compartment,

[0026] The power supply compartment is provided with any of the above-mentioned lithium-ion batteries.

[0027] The positive electrode and the negative electrode of the lithium ion battery are electrically connected to the positive electrode and the negative electrode of the driving circuit of the electronic product respectively.

[0028] As can be seen from the above, the application of the technical solution of this embodiment has the following beneficial effects:

[0029] On the one hand, it is beneficial to improve the volume energy density of lithium-ion batteries;

[0030] On the other hand, compared with the soft-pack lithium-ion battery, the shell of this embodiment adopts a steel shell structure, which has better heat dissipation and is particularly suitable for fast charging and high current discharge;

[0031] Moreover, compared with soft-pack lithium-ion batteries, the lithium-ion batteries of this solution are easy to disassemble and recycle, easy to replace, and their application is more in line with environmental protection requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The drawings described herein are used to provide a further understanding of the present invention, constitute a part of this application, and do not constitute an improper limitation of the present invention.

[0033] Figure 1 A schematic diagram of the three-dimensional structure of a lithium-ion battery provided in Example 1 of the utility model;

[0034] Figure 2 A schematic diagram of a top view of a lithium-ion battery provided in Embodiment 1 of the present utility model;

[0035] Figure 3 A bottom view structural diagram of a lithium-ion battery provided in Embodiment 1 of the present utility model;

[0036] Figure 4 A schematic diagram of a side view of a lithium-ion battery provided in Embodiment 1 of the present utility model;

[0037] Figure 5 A schematic diagram of the three-dimensional structure of a steel shell of a lithium-ion battery provided in Example 1 of the utility model;

[0038] Figure 6 A schematic diagram of a top view of a steel shell of a lithium-ion battery provided in Example 1 of the utility model;

[0039] Figure 7 A bottom view structural diagram of a steel shell of a lithium-ion battery provided in Embodiment 1 of the utility model;

[0040] Figure 8 A schematic diagram of the three-dimensional structure of a cover plate of a lithium-ion battery provided in Embodiment 1 of the present utility model;

[0041] Fig. 9 A schematic diagram of a top view of a cover plate of a lithium-ion battery provided in Embodiment 1 of the present utility model;

[0042] Fig.10 A bottom view structural schematic diagram of a cover plate of a lithium-ion battery provided in Embodiment 1 of the utility model;

[0043] Fig.11 A schematic diagram of the side structure of a cover plate of a lithium-ion battery provided in Embodiment 1 of the present utility model;

[0044] Fig.12 for Fig.10 AA cross-sectional structural diagram;

[0045] Fig.13 for Fig.10 Schematic diagram of the decomposition structure.

[0046] 1: steel shell; 11: shell bottom; 12: side wall; 13: annular step;

[0047] 2: cover plate; 21: positive electrode hole; 3: insulating rubber layer; 31: through hole;

[0048] 4: positive terminal plate; 41: boss; 5: welding track; 7: injection hole; 8: sealing sheet;

[0049] 10: Explosion-proof department. DETAILED DESCRIPTION

[0050] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. The schematic embodiments and descriptions of the present invention are used to explain the present invention but are not intended to limit the present invention.

[0051] Examples of embodiments of the present invention described in detail below are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions.

[0052] The embodiments described below with reference to the drawings attached to this specification are exemplary and are intended to be used to explain the present invention, but should not be construed as limiting the present invention. In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

[0053] In addition, the terms "second" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "second" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0054] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. Example

[0055] See also Figure 1-13 .

[0056] The present embodiment provides a steel shell lithium ion battery, which includes a steel shell 1, a cover plate 2, and a battery cell (not shown in the figure, and the specific preparation can refer to the prior art), wherein the steel shell 1 is made of a stainless steel plate, one end of the steel shell 1 is a shell opening, and the closed end opposite to the shell opening is a shell bottom 11, and the shell wall surrounded by the shell bottom 11 and extending from the shell bottom 11 to the shell opening is a side wall 12.

[0057] The inner wall of the side wall 12 is also formed with a 13 of a certain width. The annular step 13 surrounds the side wall 12 on all sides and is in a continuous closed ring shape. It is parallel to the end face of the side wall 12 at the shell opening. The top surface of the annular step 13 is lower than the shell opening. The area of ​​the closed figure surrounded by the inner edge of the annular step 13 is smaller than the area of ​​the closed figure surrounded by the inner edge of the shell opening. The preparation of the steel shell 1 can be, but is not limited to, stamping by a stamping process. A stamping part with the same shape as the shell bottom 11 of the steel shell 1 is used to stamp a steel plate to form a cavity. The stamping end of the stamping part of the cavity forms the shell opening. A stamping part with an area larger than the original stamping part is further stamped to make the side wall 12 of the steel shell 1 near the shell opening bend outward to form an annular step 13 near the shell opening. In the battery preparation process, the steel shell 1 with the annular step 13 formed is pre-stamped as a preparation.

[0058] As an illustration of this embodiment, the width of the top surface of the annular step 13 is the same at all places. The height of the annular step 13 to the end surface of the shell opening is equal to the thickness of the cover plate 2. The closed figure surrounded by the outer edge of the annular step 13 is consistent with the shape of the cover plate 2. The annular step 13 is the bearing platform of the cover plate 2. When the cover plate 2 is sealed on the top surface of the annular step 13, the circle of the bottom surface of the cover plate 2 close to the outer edge is face-to-face with the top surface of the annular step 13, and the end surface of the outer edge of the cover plate 2 is in contact with the inner wall of the side wall 12. The cover plate 2 is immersed and sealed on the inner side of the shell opening, and there is a seamless design between the cover plate 2 and the shell opening.

[0059] The cover plate 2 can be, but is not limited to, a sheet-shaped steel plate. A vertical welding machine is used to weld along the edge of the top surface of the cover plate 2. The metals of the two surfaces of the cover plate 2 and the annular step 13 are melted and fully sealed. The structure of welding the cover plate 2 with the annular step 13 of this embodiment is conducive to accurately positioning the cover plate 2, avoiding displacement of the cover plate 2 and affecting the welding effect of the cover plate 2, ensuring the sealing of the cover plate 2 and the steel shell 1, and relative to the solution of welding the cover plate 2 to the end surface of the side wall 12 of the shell opening, the design of this solution can design the width of the top surface of the annular step 13 as the welding area of ​​the cover plate 2, and the welding area of ​​the cover plate 2 is not limited to the thickness of the shell wall of the steel shell 1, which is conducive to the ultra-thin design of the steel shell 1 and the cover plate 2, so as to make full use of the volume of the lithium-ion battery and improve the volume energy density.

[0060] As an illustration of this embodiment, it is preferred that the distance between the top surface of the annular step 13 located on the inner wall of the side wall 12 and the shell opening is equal to the thickness of the cover plate 2, so that after the cover plate 2 is welded to the annular step 13, the top surface of the cover plate 2 is flush with the end surface of the shell opening. This design makes the shape of the lithium-ion battery have good flatness and consistency, which is conducive to fully utilizing the space of the shell and increasing the capacity of the lithium-ion battery.

[0061] A through hole is also provided on the steel shell 1 or the cover plate 2 , which is referred to as a positive hole 21 . The positive terminal plate 4 is thermally bonded to the positive hole 21 through an insulating adhesive layer 3 to seal the positive hole 21 .

[0062] In this embodiment, the positive electrode hole 21 is designed on the cover plate 2 as an illustration, the insulating rubber layer 3 has a through hole with a hole diameter equal to or smaller than the positive electrode hole 14, the insulating rubber layer 3 is tightly attached to the inner surface of the cover plate, the through hole of the insulating rubber layer 3 is directly opposite to the center of the positive electrode hole 14, the insulating rubber layer 3 is at least flush with the edge of the positive electrode hole 14, and preferably the inner edge exceeds a certain width inside the positive electrode hole 14, the positive terminal plate 4 and the insulating rubber layer 3 face to face and tightly attached to the bottom surface of the insulating rubber layer 3, and the bottom surface of the positive terminal plate 4 is used as the fixed-point welding position for welding the positive electrode of the battery cell.

[0063] A boss 41 having a diameter smaller than that of the positive electrode hole is disposed on the top surface of the positive terminal plate 4 . The cross-sectional shape of the boss 41 is not limited, and may be circular, square, triangular, or quadrilateral.

[0064] The height of the boss 41 of the positive terminal plate 4 is equal to or greater than the sum of the thicknesses of the insulating rubber layer 3 and the cover plate, so that the boss 41 passes through the through hole of the insulating rubber layer 3 and the positive electrode hole of the cover plate, and is exposed on the outer surface of the cover plate, serving as the positive electrode of the lithium-ion battery for external connection.

[0065] As an illustration of this embodiment, the top surface of the boss 41 can be made flush with the top surface of the cover plate, or the top surface of the boss 41 can be made slightly higher than the top surface of the cover plate.

[0066] During preparation, the insulating rubber layer 3 and the positive terminal plate 4 are stacked on the bottom surface of the cover plate, and the stack is pressed by hot pressing equipment. Under the action of heat and pressure, the colloids on both surfaces of the insulating rubber layer 3 melt and are fully combined with the surfaces of the cover plate and the positive terminal plate 4 facing it. After fixing for a predetermined time and cooling and shaping, the cover plate 2 with the positive terminal plate 4 preset is obtained as a preparation.

[0067] When assembling the battery cell, the positive electrode of the battery cell is welded to the bottom end of the positive terminal plate 4 of the cover plate, and the negative electrode of the battery cell is connected to any point of the inner wall of the steel shell 1. The positive terminal plate 4 is used as the positive electrode of the lithium ion battery, and the steel shell 1 is used as the negative electrode of the lithium ion battery.

[0068] This embodiment uses a laminated lithium-ion battery cell, and the shapes of the pole pieces of the laminated battery cell are respectively consistent with the shapes of the shell bottom 11 of the steel shell 1. The thickness of the laminated battery cell is the same or substantially the same as the height from the shell bottom 11 of the steel shell 1 to the annular step 13, so that the space in the cavity of the steel shell 1 is fully utilized to improve the volume energy density of the lithium-ion battery.

[0069] Especially when applied to square batteries or special-shaped steel shell batteries, compared with cylindrical wound battery cells, the laminated lithium-ion battery using the above solution can fully utilize the space in the shell and improve the volume energy density of the battery.

[0070] As can be seen from the above, the application of the technical solution of this embodiment has the following beneficial effects:

[0071] On the one hand, it is beneficial to improve the volume energy density of lithium-ion batteries;

[0072] On the other hand, compared with the soft-pack lithium-ion battery, the steel shell 1 structure of this embodiment has better heat dissipation and is particularly suitable for fast charging and high current discharge;

[0073] Moreover, compared with soft-pack lithium-ion batteries, the lithium-ion batteries of this solution are easy to disassemble and recycle, easy to replace, and their application is more in line with environmental protection requirements.

[0074] As an illustration of this embodiment, a liquid injection hole 7 may be further provided on the steel shell 1, preferably but not limited to, the liquid injection hole 7 is provided on the side wall 12. When assembling the battery cell, after the positive and negative electrodes of the battery cell and the steel shell 1 are welded, and the cover plate 2 is welded, the electrolyte is injected, which can avoid the electrolyte contaminating the welding surface and affecting the welding effect, resulting in a cold weld.

[0075] In addition, compared with the solution in which the injection hole 7 is arranged on the cover plate 2 or the shell bottom 11, the injection hole 7 is arranged on the side wall 12, and the electrolyte penetrates from the side of the laminated battery cell, which is more conducive to improving the penetration efficiency of the electrolyte, improving the injection effect and improving work efficiency.

[0076] After the liquid is injected, a metal sheet with a larger area than the injection hole 7 is covered on the injection hole 7 as a sealing sheet 8. The top surface of the sealing sheet 8 is laser welded at a predetermined distance around the outer circumference of the injection hole 7 to form a welding track 5 surrounding the outside of the injection hole 7. In the area of ​​the welding track 5, the metal of the contact surface between the sealing sheet 8 and the side wall 12 is melted and sealed to seal the injection hole 7.

[0077] As an illustration of this embodiment, the liquid injection hole 7 and the positive terminal plate 4 can be arranged on the same side wall 12 of the steel shell 1 .

[0078] As an illustration of this embodiment, a negative terminal plate 9 may be further provided on the steel shell 1 or the cover plate so as to be connected to a fixed point of an external power source.

[0079] As an illustration of this embodiment, an explosion-proof portion 10 may be provided at any position of the shell wall of the steel shell 1 (or cover plate 2 ), and the wall thickness at the location of the explosion-proof portion 10 is thinner than the wall thickness at other positions of the steel shell 1 (or cover plate 2 ).

[0080] For example, but not limited to, the explosion-proof part 10 is arranged on the shell bottom 11 of the steel shell 1, or on the cover plate 2 opposite to the shell bottom 11. The thinned position of the explosion-proof part 10 can be arranged on the outer surface of the battery for user identification, or on the inner surface of the battery.

[0081] The lithium-ion battery of this embodiment can be used in electronic products. The lithium-ion battery is installed in the power supply compartment of the electronic product, so that the positive and negative electrodes of the lithium-ion battery are respectively electrically connected to the positive and negative electrodes of the driving circuit of the electronic product. The battery is used as the power supply for the driving circuit to drive the circuit of the electronic product.

[0082] As an illustration of this embodiment, the shapes of the positive terminal plate 4 and the negative terminal plate 9 may be designed to be different, but not limited to, to improve the identification of the positive and negative electrodes and avoid reverse connection.

[0083] As an illustration of this embodiment, it is possible but not limited to setting a power contact opposite to the positive terminal plate 4 and the negative terminal plate 9 of the steel shell 1 battery in the power compartment, and setting a spring at the rear end of the power terminal. Through the elastic force, the power contact with the drive circuit is respectively pressed against the positive terminal plate 4 and the negative terminal plate 9 of the steel shell 1 battery with a certain pressure, so that the connection of the power supply is simple and convenient.

[0084] As an illustration of this embodiment, the outer shell composed of a steel shell 1 and a cover plate 2 of this embodiment can be flexibly designed according to the shape of the power supply compartment of the electronic product. For example, when the power supply compartment has a pentagonal structure, the outer shell can be designed as a columnar structure with a closed figure having a pentagonal cross-section. Similarly, when the power supply compartment has other special-shaped structures, the outer shell of the battery is designed to be a matching special shape, which is conducive to making full use of the space in the power supply compartment and improving the volume energy density of the lithium-ion battery.

[0085] The above-described implementation methods do not constitute a limitation on the protection scope of the technical solution. Any modification, equivalent replacement and improvement made within the spirit and principle of the above-described implementation methods shall be included in the protection scope of the technical solution.

Claims

1. A lithium ion battery, characterized in that: include, A steel shell, comprising a shell opening, a side wall surrounding the shell opening, and a shell bottom facing the shell opening. An annular step is provided on the inner wall of the side wall near the shell opening, and the annular step surrounds the side wall to form a continuous closed ring. The battery cell is sealed in the cavity of the steel shell, the negative electrode is electrically connected to the steel shell, and the steel shell is used as the negative electrode. The outer edge of the bottom surface of the steel cover plate is in contact with the top surface of the annular step, and the metals of the two surfaces are melted and sealed. The cover plate seals the shell opening. A positive electrode hole is also provided on the cover plate, and the positive terminal plate is thermally composited to the inner surface of the cover plate through an insulating adhesive layer, and the adhesive layers on both surfaces of the insulating adhesive layer are sealed and combined with the cover plate and the positive terminal plate. The insulating adhesive layer seals the positive electrode hole, and insulates and separates the cover plate and the positive terminal plate. The positive electrode of the battery cell is connected to the bottom surface of the positive terminal plate, and part of the top surface of the positive terminal plate is exposed from the positive electrode hole to the outside of the steel shell, and the positive terminal plate is used as the positive electrode.

2. The lithium-ion battery according to claim 1, characterized in that: The outer shell formed by the steel shell and the cover plate is a closed figure with a bottom surface and a top surface having three sides.

3. The lithium-ion battery according to claim 1, characterized in that: The bottom surface and the top surface of the outer shell formed by the steel shell and the cover plate are pentagonal.

4. The lithium-ion battery according to claim 1, characterized in that: The insulating adhesive layer has a through hole with a hole diameter equal to or smaller than that of the positive electrode hole portion, the insulating adhesive layer is closely attached to the inner surface of the cover plate, and the through hole is directly opposite to the center of the positive electrode hole portion. The positive terminal plate is closely attached to the bottom surface of the insulating rubber layer, and the positive electrode of the battery cell is welded to the bottom surface of the positive terminal plate. A boss with a diameter smaller than that of the positive electrode hole is provided on the top surface of the positive terminal plate. The boss passes through the through hole of the insulating rubber layer and is exposed on the outer surface of the cover plate to serve as the positive electrode of the lithium-ion battery.

5. The lithium-ion battery according to claim 4, characterized in that: The boss is higher than the top surface of the cover plate.

6. The lithium-ion battery according to claim 4, characterized in that: A liquid injection hole is also provided on one side wall of the steel shell, and a sealing sheet is provided on the liquid injection hole. The bottom surface of the sealing sheet is in contact with the outer surface of the side wall outside the liquid injection hole, and the metal of the contacting surfaces is molten and sealed, and the sealing sheet seals the liquid injection hole.

7. The lithium-ion battery according to claim 1, characterized in that: An explosion-proof portion is also provided on the steel shell and / or the cover plate. The wall thickness at the location of the explosion-proof portion is thinner than the wall thickness of the steel shell and / or the cover plate.

8. The lithium-ion battery according to claim 7, characterized in that: The explosion-proof portion is located on the outer surface of the steel shell and / or the cover plate.

9. The lithium-ion battery according to claim 8, characterized in that: The explosion-proof portion is located on the cover plate.

10. An electronic product, characterized in that: Including power supply compartment, A lithium-ion battery according to any one of claims 1 to 9 is arranged in the power supply compartment. The positive electrode and the negative electrode of the lithium ion battery are electrically connected to the positive electrode and the negative electrode of the driving circuit of the electronic product respectively.

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