Battery cover plate, battery shell, secondary battery and electric equipment

Abstract

The utility model discloses a battery cover plate, a battery shell, a secondary battery and electric equipment. The battery cover plate comprises an electrode substrate and an electrode column assembled on the electrode substrate, a step structure is formed on the outer edge of the electrode substrate and comprises a horizontal step surface and a vertical step surface; at least one through electrode through hole is formed in the electrode substrate, an electrode column is arranged in each electrode through hole in a penetrating manner, and each electrode column is isolated from the upper end face of the electrode substrate through an upper isolation piece, isolated from the corresponding electrode through hole through a sealing ring and isolated from the lower end face of the electrode substrate through a lower isolation piece. According to the utility model, the step structure is arranged at the outer edge of the lower end surface of the electrode substrate, so that the battery shell and the electrode substrate can be conveniently welded, and the battery cover plate can be prevented from shifting in the welding process; the structure is simple and practicability is high.

Description

Technical Field

[0001] The utility model belongs to the technical field of secondary batteries, and in particular relates to a battery cover, a battery shell, a secondary battery and electrical equipment. Background Art

[0002] The outer shell of a secondary battery usually includes a shell and a battery cover plate welded and fixed at the shell opening. The battery cover plate is usually in the shape of a flat plate. When welding, the battery cover plate is first placed at the shell opening, and then fixed by laser welding. In the past, there were two main welding methods for the battery cover plate:

[0003] 1. Make the laser weld vertically downward from just above the side wall of the shell. When using this welding method, if the wall thickness of the shell is too thin, it is difficult to ensure that the laser is aligned with just above the side wall of the shell during welding, so it is easy to cause welding deviation, resulting in loose welding of the battery cover.

[0004] Second, the laser is used to perform horizontal welding at the position where the shell and the battery cover contact. When this welding method is used, if the wall thickness of the battery shell is too thin, it is easy to weld through the side wall of the shell, causing the battery shell to be scrapped.

[0005] Therefore, when the battery shell wall thickness is relatively thin, it is difficult to weld the battery cover plate to the shell using the existing structure. Utility Model Content

[0006] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is to provide a battery cover, a battery housing, a secondary battery and an electrical device.

[0007] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0008] A battery cover comprises an electrode substrate and an electrode column mounted on the electrode substrate; a step structure is formed on the outer edge of the electrode substrate, and the step structure comprises a horizontal step surface and a vertical step surface; at least one through-hole is provided on the electrode substrate, and an electrode column is passed through each of the electrode through holes, and the electrode column is isolated from the upper end surface of the electrode substrate by an upper isolating member, isolated from the electrode through hole by a sealing ring, and isolated from the lower end surface of the electrode substrate by a lower isolating member.

[0009] Furthermore, the step structure is formed on the electrode substrate by stamping and upsetting or CNC milling.

[0010] Furthermore, the width of the horizontal step surface is adapted to the wall thickness of the assembled shell.

[0011] Furthermore, the thickness of the electrode substrate is 0.3 mm to 1.5 mm; the height of the vertical step surface is greater than or equal to 0.15 mm and less than the thickness of the electrode substrate; and the width of the horizontal step surface is 0.2 mm to 0.5 mm.

[0012] Furthermore, the upper isolating member is defined as an isolating plate, on which an electrode pressing plate is pressed, and the electrode pressing plate is used to press the electrode column onto the electrode substrate; the lower isolating member is defined as an electrode stop frame, and the electrode stop frame is provided with a first clearance through hole at the position corresponding to the electrode through hole, and the isolating plate is provided with a second clearance through hole at the position corresponding to the electrode through hole; the electrode pressing plate is provided with a third clearance through hole at the position corresponding to the second clearance through hole; the sealing ring passes through the first clearance through hole, the electrode through hole and the second clearance through hole in sequence, and abuts against the hole walls of the first clearance through hole, the electrode through hole and the second clearance through hole; the electrode column includes a pole base and a columnar portion arranged on the pole base, the columnar portion passes through the sealing ring from bottom to top and extends into the third clearance through hole, and the columnar portion is fixedly connected to the electrode pressing plate.

[0013] Furthermore, the electrode column is a positive electrode of the battery, and the separator is a positive electrode weak conductor made of a weakly conductive material; and / or

[0014] The electrode column is the negative electrode of the battery, and the separator is a negative electrode insulating plate made of insulating material.

[0015] Furthermore, at least two first bulges protruding upward are arranged on the electrode substrate, and at least two of the first bulges are located below the isolation plate; the lower end surface of the isolation plate is provided with an isolation plate positioning hole corresponding to each first bulge, and each of the first bulges extends into the corresponding isolation plate positioning hole; the upper end surface of the isolation plate is provided with a second bulge at a position directly above each isolation plate positioning hole, and the lower end surface of the electrode pressure plate is provided with a pressure plate positioning hole corresponding to the position of each second bulge, and each of the second bulges extends into the corresponding pressure plate positioning hole.

[0016] Furthermore, the upper end surface of the isolation plate is provided with a pressure plate positioning groove, the shape of which is adapted to the electrode pressure plate, and the lower part of the electrode pressure plate is arranged in the pressure plate positioning groove; the lower end surface of the electrode stop frame is provided with a pole positioning groove, the shape of which is adapted to the shape of the pole base, and the pole base is arranged in the pole positioning groove.

[0017] A battery shell comprises a shell, the shell is cylindrical, the upper end and the lower end of the shell are respectively provided with an opening, and each of the openings is respectively provided with a battery cover as described in any one of the above; the electrode substrate is provided with a through electrode through hole, wherein the electrode column penetrating the electrode through hole of the electrode substrate at the opening of the upper end of the shell is a positive electrode, and the electrode column penetrating the electrode through hole of the electrode substrate at the opening of the lower end of the shell is a negative electrode.

[0018] A battery shell comprises a shell, the upper end of which is provided with an opening, and a battery cover is provided in the shell; the electrode substrate is provided with two through-holes, the electrode column passing through one of the electrode through holes is a positive electrode, and the electrode column passing through the other electrode through hole is a negative electrode.

[0019] A secondary battery includes a battery casing.

[0020] An electric device includes a secondary battery.

[0021] In the utility model, a step structure is provided at the outer edge of the lower end surface of the electrode substrate, which can facilitate the welding of the battery housing and the electrode substrate and avoid the displacement of the battery cover during the welding process; by providing a first convex bump on the electrode substrate, providing a second convex bump and a pressure plate positioning groove on the isolation plate, and providing a pole positioning groove on the electrode stop frame, accurate positioning between the components of the battery cover can be achieved, and rotational displacement between the components can be avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0023] Figure 1 It is a top view of an embodiment of a battery cover of the present utility model.

[0024] Figure 2 for Figure 1 AA section view.

[0025] Figure 3 for Figure 2 Enlarged view of point B in the middle.

[0026] Figure 4 The figure is a schematic diagram of a battery cover and shell welding method in the prior art.

[0027] Figure 5 It is a schematic diagram of another battery cover and shell welding method in the prior art.

[0028] Figure 6It is a schematic diagram of welding the battery cover and the shell of the utility model in the horizontal direction.

[0029] Figure 7 It is a schematic diagram of welding the battery cover and the shell of the utility model at an inclined angle.

[0030] Figure 8 This is the exploded view of the battery cover when it is placed forward.

[0031] Fig. 9 This is the exploded view of the battery cover when it is placed upside down.

[0032] Fig.10 This is an exploded view of an embodiment of a battery housing of the present utility model.

[0033] The accompanying drawings in the specification are numeraled as follows:

[0034] Electrode substrate-100; electrode through hole-110; first convex bump-120; notch-130; horizontal step surface-131; vertical step surface-132; first liquid injection hole-140;

[0035] Isolation plate-200; second through hole-210; second convex bump-221; isolation plate positioning hole-222; pressure plate positioning groove-230;

[0036] Electrode pressing plate-300; third yielding through hole-310; pressing plate positioning hole-320;

[0037] Sealing ring - 400;

[0038] Electrode stop frame-500; first clearance through hole-510; second liquid injection hole-520; pole positioning groove-530;

[0039] Electrode column-600; electrode base-610; columnar portion-620;

[0040] Shell-700; opening-710; explosion-proof notch-720. DETAILED DESCRIPTION

[0041] The following describes the implementation of the present invention through specific examples. The illustrations provided in the following embodiments are only used to schematically illustrate the basic concept of the present invention. The following embodiments and features in the embodiments may be combined with each other without conflict.

[0042] See also Figure 1The utility model discloses a battery cover. The battery cover of this embodiment includes an electrode substrate 100 and an electrode column 600 assembled on the electrode substrate 100. The thickness of the electrode substrate 100 is generally 0.3mm to 1.5mm. In this embodiment, the electrode substrate 100 is made of a 0.6mm thick SUS304 O-state stainless steel plate by punching. The tensile and yield strength of the material is greater than 515Mpa, which is much greater than the strength of the AL3003H14 aluminum alloy material commonly used in the existing electrode substrate 100.

[0043] See also Figure 2 and Figure 3 , a ring-shaped notch 130 is provided at the outer edge of the lower end surface of the electrode substrate 100, so that a step structure including a horizontal step surface 131 and a vertical step surface 132 is formed on the outer edge of the electrode substrate 100; the step structure is formed by stamping and upsetting or CNC milling on the electrode substrate 100. The height d1 of the vertical step surface 132 is ≥ 0.15 mm, and the height d1 of the vertical step surface 132 (i.e., the height of the notch 130) is less than the thickness d2 of the electrode substrate 100; generally, the height d1 of the vertical step surface 132 is not greater than half of the thickness d2 of the electrode substrate 100. In this embodiment, the height d1 of the vertical step surface 132 is 0.15 mm to 0.3 mm. The width L of the horizontal step surface 131 (i.e., the width of the notch 130) is adapted to the wall thickness d3 of the assembled shell 700, and generally 0.2 mm ≤ L ≤ 0.5 mm. For example, when the electrode substrate 100 is used to be assembled on a stainless steel housing 700 with a wall thickness of d3 = 0.18 mm, the width L of the horizontal step surface 131 is generally 0.2 mm to 0.23 mm.

[0044] See also Figure 4 , is a schematic diagram of using laser to weld the electrode substrate 100 to the housing 700 from just above the side wall of the housing 700. During welding, the laser needs to be aimed at just above the side wall of the housing 700, and the irradiation range of the laser cannot exceed Figure 4 If the wall thickness d3 of the housing 700 is too thin, it is difficult to align the laser, and the irradiation direction of the laser will inevitably vibrate slightly during the welding process, making it difficult to ensure that the irradiation range of the laser is always within the narrow area between the two dotted lines. This can easily lead to welding deviation, resulting in a weak weld. Figure 5 FIG. 1 is a schematic diagram of laser welding horizontally from the gap formed by the contact between the housing 700 and the electrode substrate 100. If the wall thickness d3 of the housing 700 is too thin, Figure 5 The shell 700 in the area between the two dotted lines can be easily welded through, resulting in product failure.

[0045] See also Figure 6 If the structure of forming a ring-shaped notch 130 at the outer edge of the lower end surface of the electrode substrate 100 in this embodiment is adopted, when laser welding is performed horizontally from the gap formed by the contact between the shell 700 and the horizontal step surface 131 at the notch 130, the shell 700 will not be welded through because the shell 700 in the area between the two dotted lines is in contact with the vertical step surface 132 at the notch 130. Please refer to Figure 7 , the laser can also be moved downward to weld the contact area between the shell 700 and the notch 130 obliquely upward, and the shell 700 will not be welded through. In addition, after the battery cover is placed on the notch 130 of the shell 700, the vertical step surface 132 at the notch 130 abuts against the inner wall of the shell 700, which can also play a role in positioning the battery cover and prevent the battery cover from shifting during the welding process.

[0046] See also Figure 8 and Fig. 9 , at least one through electrode through hole 110 is provided on the electrode substrate 100, and the number of electrode through holes 110 is determined by the number of electrodes to be installed on the electrode substrate 100. For example, when only one positive electrode or one negative electrode needs to be installed on the electrode substrate 100, only one through electrode through hole 110 is provided on the electrode substrate 100; when one positive electrode and one negative electrode need to be installed on the electrode substrate 100 at the same time, two through electrode through holes 110 need to be provided on the electrode substrate 100.

[0047] An electrode column 600 is respectively passed through each of the electrode through holes 110. The electrode column 600 is isolated from the upper end surface of the electrode substrate 100 by an upper isolating member, isolated from the electrode through hole 110 by a sealing ring 400, and isolated from the lower side surface of the electrode substrate 100 by a lower isolating member. The sealing ring 4003 is generally made of rubber material (e.g., fluororubber).

[0048] In this embodiment, the upper isolating member is an isolating plate 200. When the electrode column 600 is used as the positive electrode of the battery, the electrode column 600 can be made of aluminum material through a stamping process; the isolating plate 200 is a positive electrode weak conductor made of a weakly conductive material, for example, the positive electrode weak conductor can be made of a conductive PPS material. When the electrode column 600 is used as the negative electrode of the battery, the electrode column 600 can be made of copper material through a stamping process; the isolating plate 200 is a negative electrode insulating plate made of an insulating material, for example, the negative electrode insulating plate can be made of insulating PPS plastic. An electrode pressing plate 300 is pressed on the isolating plate 200, and the electrode pressing plate 300 is used to press the electrode column 600 onto the electrode substrate 100; the electrode pressing plate 300 is generally made of aluminum material through a stamping process.

[0049] In this embodiment, the lower isolating member is an electrode stop frame 500, and the electrode stop frame 500 can be made of polyurethane material through an injection molding process. The electrode stop frame 500 is provided with a first clearance through hole 510 at the position corresponding to the electrode through hole 110, the isolation plate 200 is provided with a second clearance through hole 210 at the position corresponding to the electrode through hole 110, and the electrode pressing plate 300 is provided with a third clearance through hole 310 at the position corresponding to the second clearance through hole 210. The sealing ring 400 passes through the first clearance through hole 510, the electrode through hole 110, and the second clearance through hole 210 in sequence, and abuts against the hole walls of the first clearance through hole 510, the electrode through hole 110, and the second clearance through hole 210. The electrode column 600 includes an electrode base 610 and a columnar portion 620 disposed on the electrode base 610 . The columnar portion 620 passes through the sealing ring 400 from bottom to top and extends into the third clearance through hole 310 . The columnar portion 620 is fixedly connected to the electrode pressing plate 300 .

[0050] To facilitate positioning of the electrode pressing plate 300, the upper end surface of the isolation plate 200 may be provided with a pressing plate positioning groove 230, the shape of which matches that of the electrode pressing plate 300, and the lower part of the electrode pressing plate 300 is arranged in the pressing plate positioning groove 230, thereby preventing the electrode pressing plate 300 from rotating and shifting. To facilitate positioning of the electrode column 600, the lower end surface of the electrode stop frame 500 may be provided with a pole positioning groove 530, the shape of which matches that of the pole base 610, and the pole base 610 is arranged in the pole positioning groove 530, thereby preventing the electrode column 600 from rotating and shifting. To prevent the electrode stop frame 500 from being too thick, the depth of the pole positioning groove 530 is generally not greater than the thickness of the pole base 610, so that the lower end surface of the pole base 610 is flush with the lower end surface of the electrode stop frame 500, or the lower part of the pole base 610 protrudes downward from the lower end surface of the electrode stop frame 500.

[0051] Two first convex bumps 120 protruding upward are formed on the electrode substrate 100 by a stamping process, and the two first convex bumps 120 are both located below the isolation plate 200. The two first convex bumps 120 are generally symmetrically arranged on both sides of the electrode through hole 110; of course, more first convex bumps 120 can also be arranged on the electrode substrate 100. The lower end surface of the isolation plate 200 is respectively provided with an isolation plate positioning hole 222 corresponding to the two first convex bumps 120, and the isolation plate positioning hole 222 is a blind hole, and the two first convex bumps 120 extend into the corresponding isolation plate positioning hole 222 respectively; thus, an anti-torsion structure is formed by the two first convex bumps 120 and the two isolation plate positioning holes 222 to prevent the isolation plate 200 from rotating, and the anti-torsion structure prevents the isolation plate 200 from rotating and shifting. The upper end surface of the isolation plate 200 is respectively provided with a second convex bump 221 at a position directly above the two isolation plate positioning holes 222, and the lower end surface of the electrode pressing plate 300 is respectively provided with a pressing plate positioning hole 320 at a position corresponding to the two second convex bumps 221. The pressing plate positioning hole 320 is a blind hole, and the two second convex bumps 221 extend into the corresponding pressing plate positioning hole 320. By providing the two second convex bumps 221, the isolation plate 200 can still maintain the previous thickness (excluding the thickness of the second convex bumps 221) after the isolation plate positioning holes 222 are provided, and the electrode pressing plate 300 can be further positioned by the second convex bumps 221.

[0052] When the battery cover is a battery upper cover for closing the top opening 710 of the battery housing 700, the electrode substrate 100 is further provided with a first injection hole 140, and the first injection hole 140 is located on one side of the isolation plate 200. The electrode stopper 500 is provided with a second injection hole 520 at a position corresponding to the first injection hole 140, so that liquid can be injected into the battery housing 700 through the through hole formed by the first injection hole 140 and the second injection hole 520. When the battery cover is a battery lower cover for closing the bottom opening 710 of the battery housing 700, the electrode substrate 100 and the electrode stopper 500 are not provided with the first injection hole 140 and the second injection hole 520.

[0053] In this embodiment, a circle of notches 130 is provided at the outer edge of the lower end surface of the electrode substrate 100, which can facilitate welding of the battery housing 700 and the electrode substrate 100, and can prevent the battery cover from shifting during the welding process; at the same time, the electrode substrate 100 as a whole is still in a flat structure, which is convenient for film protection of the surface of the electrode substrate. By providing a first convex bump 120 on the electrode substrate 100, a second convex bump 221 and a pressure plate positioning groove 230 on the isolation plate 200, and a pole positioning groove 530 on the electrode stop frame 500, accurate positioning between the various components of the battery cover can be achieved to prevent rotational displacement between the components.

[0054] See also Fig.10 The utility model also discloses a battery shell. The battery shell of this embodiment includes a shell 700. The shell 700 is cylindrical. An explosion-proof notch 720 for forming an explosion-proof valve is provided on one side of the shell 700. An opening 710 is provided at the upper end and the lower end of the shell 700, respectively. A battery cover plate of any of the above-mentioned embodiments is provided in each of the openings 710. An electrode through hole 110 is provided on the electrode substrates 100 of the two battery covers, respectively. The electrode column 600 passing through the electrode through hole 110 of the electrode substrate 100 at the opening 710 at the upper end of the shell 700 is a positive electrode, and the electrode column 600 passing through the electrode through hole 110 of the electrode substrate 100 at the opening 710 at the lower end of the shell 700 is a negative electrode.

[0055] Of course, when the positive electrode and the negative electrode of the battery need to be arranged on one electrode substrate 100, only the opening 710 can be arranged at the upper end of the shell 700, so that only one battery cover is arranged at the opening 710 at the upper end of the shell 700. The electrode substrate 100 of the battery cover is provided with two through electrode through holes 110, and the electrode column 600 passing through one of the electrode through holes 110 is a positive electrode, and the electrode column 600 passing through the other electrode through hole 110 is a negative electrode.

[0056] In this embodiment, the battery casing adopts an electrode substrate 100 with a circle of notches 130 at the outer edge of the lower end surface, which can ensure that the electrode substrate 100 and the shell 700 are firmly welded and avoid the shell 700 being welded through during welding and causing leakage of the battery casing.

[0057] The utility model also discloses a secondary battery, which is provided with the battery casing of any one of the above embodiments.

[0058] The utility model also discloses an electric device, which is provided with a secondary battery according to any one of the above embodiments.

[0059] The above embodiments only express the preferred implementation of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A battery cover, characterized in that: It includes an electrode substrate and an electrode column mounted on the electrode substrate; a step structure is formed on the outer edge of the electrode substrate, and the step structure includes a horizontal step surface and a vertical step surface; a through electrode through hole is provided on the electrode substrate, and the electrode column is passed through the electrode through hole, and the electrode column is isolated from the upper end surface of the electrode substrate by an upper isolating member, isolated from the electrode through hole by a sealing ring, and isolated from the lower end surface of the electrode substrate by a lower isolating member.

2. The battery cover according to claim 1, characterized in that: The step structure is formed on the electrode substrate by stamping and upsetting or CNC milling.

3. The battery cover according to claim 1, characterized in that: The width of the horizontal step surface is adapted to the wall thickness of the assembled housing.

4. The battery cover according to claim 1, characterized in that: The thickness of the electrode substrate is 0.3 mm to 1.5 mm; the height of the vertical step surface is greater than or equal to 0.15 mm and less than the thickness of the electrode substrate; and the width of the horizontal step surface is 0.2 mm to 0.5 mm.

5. The battery cover according to any one of claims 1 to 4, characterized in that: The upper isolating member is defined as an isolating plate, on which an electrode pressing plate is pressed, and the electrode pressing plate is used to press the electrode column onto the electrode substrate; the lower isolating member is defined as an electrode stop frame, and the electrode stop frame is provided with a first clearance through hole at a position corresponding to the electrode through hole, and the isolating plate is provided with a second clearance through hole at a position corresponding to the electrode through hole; the electrode pressing plate is provided with a third clearance through hole at a position corresponding to the second clearance through hole; the sealing ring passes through the first clearance through hole, the electrode through hole and the second clearance through hole in sequence, and abuts against the hole walls of the first clearance through hole, the electrode through hole and the second clearance through hole; the electrode column includes a pole base and a columnar portion provided on the pole base, the columnar portion passes through the sealing ring from bottom to top and extends into the third clearance through hole, and the columnar portion is fixedly connected to the electrode pressing plate.

6. The battery cover according to claim 5, characterized in that: The electrode column is the positive electrode of the battery, and the separator is a positive electrode weak conductor made of a weakly conductive material; and / or The electrode column is the negative electrode of the battery, and the separator is a negative electrode insulating plate made of insulating material.

7. The battery cover according to claim 5, characterized in that: At least two first convex bumps protruding upward are arranged on the electrode substrate, and at least two of the first convex bumps are located below the isolation plate; the lower end surface of the isolation plate is respectively provided with an isolation plate positioning hole corresponding to each first convex bump, and each first convex bump extends into the corresponding isolation plate positioning hole; the upper end surface of the isolation plate is provided with a second convex bump at a position directly above each isolation plate positioning hole, and the lower end surface of the electrode pressure plate is respectively provided with a pressure plate positioning hole corresponding to the position of each second convex bump, and each second convex bump extends into the corresponding pressure plate positioning hole.

8. The battery cover according to claim 5, characterized in that: The upper end surface of the isolation plate is provided with a pressure plate positioning groove, the shape of which is adapted to the electrode pressure plate, and the lower part of the electrode pressure plate is arranged in the pressure plate positioning groove; the lower end surface of the electrode stop frame is provided with a pole positioning groove, the shape of which is adapted to the shape of the pole base, and the pole base is arranged in the pole positioning groove.

9. A battery housing, characterized in that: It comprises a shell, wherein the upper and lower ends of the shell are respectively provided with an opening, and each of the openings is respectively provided with a battery cover plate as described in any one of claims 1 to 8; the electrode substrate is provided with a through electrode through hole, wherein the electrode column penetrating the electrode through hole of the electrode substrate at the opening of the upper end of the shell is a positive electrode, and the electrode column penetrating the electrode through hole of the electrode substrate at the opening of the lower end of the shell is a negative electrode.

10. A battery housing, characterized in that: It comprises a shell, the upper end of which is provided with an opening, and the shell is provided with a battery cover as described in any one of claims 1 to 8; the electrode substrate is provided with two through-holes, the electrode column passing through one of the electrode through holes is a positive electrode, and the electrode column passing through the other electrode through hole is a negative electrode.

11. A secondary battery, characterized in that: Comprising a battery casing as claimed in claim 9 or claim 10.

12. An electrical equipment, characterized in that: Comprising the secondary battery as claimed in claim 11.

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