Electrode substrate, battery cover plate, battery case and manufacturing method therefor

Abstract

An electrode substrate (101), a battery cover plate (100), a battery case and a manufacturing method therefor. The electrode substrate (101) is used for assembling an electrode pole (120) of a battery, and comprises a substrate body (110) and side plates (112) arranged around the substrate body (110), wherein the side plates (112) are attached to or close to an inner side wall or an outer side wall of a battery case (200) and are welded to the battery case (200). The side plates (112) are arranged around the substrate body (110) such that the electrode substrate (101) can be conveniently welded to the battery case (200), the rigidity of the electrode substrate (101) is improved, the electrode substrate (101) has a strong bending resistance capability, and the thickness of the electrode substrate (101) can be reduced without changing the bending resistance capability.

Description

Electrode substrate, battery cover, battery shell and manufacturing method thereof Technical Field

[0001] The present invention belongs to the technical field of batteries and relates to an electrode substrate, a battery cover, a battery shell and a manufacturing method thereof. Background Art

[0002] The substrates of the covers of existing secondary batteries such as blade batteries are generally made of aluminum to reduce weight, but due to the low rigidity of aluminum, the thickness of the aluminum material generally needs to reach 2mm to meet the bending resistance and welding requirements of the battery cover. Since a large number of blade batteries need to be installed in electrical equipment such as new energy vehicles, it is necessary to reduce the thickness of the material to reduce material costs and reduce the weight of the battery. In addition, the battery shell also needs to reduce the thickness of the material to reduce material costs and reduce weight. Please refer to Figure 1, the direction indicated by the arrow is the irradiation direction of the laser, and the area between the two dotted lines is the irradiation area allowed by the laser during the welding process. Since the battery cover is flat, there are generally two welding methods when welding the battery cover to the battery shell:

[0003] As shown in Figure 1(a), one method is to use a laser to weld the battery cover to the shell from just above the shell side wall. During welding, the laser needs to be aligned directly above the shell side wall, and the laser irradiation range cannot exceed the area between the two dotted lines in Figure 1(a) during the welding process. If the shell wall thickness d1 is too thin, the laser is difficult to align, and the laser irradiation direction will inevitably vibrate slightly during the welding process, making it difficult to keep the laser irradiation range within the narrow area between the two dotted lines. This can easily cause welding deviation, resulting in a weak weld. As shown in Figure 1(b), another method is to use a laser to weld horizontally from the gap formed by the contact between the shell and the battery cover. If the shell wall thickness is too thin, the shell in the area between the two dotted lines in Figure 1(b) can easily be welded through, resulting in product scrapping. Therefore, when the shell is thin, it is difficult to weld a flat battery cover to the shell.

[0004] Summary of the Invention

[0005] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is to provide an electrode substrate, a battery cover, a battery housing and a manufacturing method thereof.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] An electrode substrate for assembling an electrode column of a battery comprises a substrate body and side plates arranged around the substrate body. The side plates are attached to or close to the inner or outer wall of a battery shell and are welded to the battery shell.

[0008] A battery cover comprises an electrode substrate and an electrode assembly mounted on the electrode substrate; the electrode substrate has a front side and a back side arranged opposite to each other, the electrode substrate is provided with an electrode through-hole running through the front side and the back side thereof, the electrode assembly comprises an electrode column passing through the electrode through-hole, an upper isolating member for isolating the front side of the electrode substrate from the electrode column, a sealing ring for isolating the hole wall of the electrode through-hole from the electrode column, and a lower isolating member for isolating the back side of the electrode substrate from the electrode column.

[0009] A method for manufacturing a battery casing, for manufacturing a battery casing, comprising the following steps:

[0010] S1. Form a circle of side plates bent upward or downward around the substrate body by a stamping process to obtain an electrode substrate;

[0011] S2. Installing an electrode assembly on an electrode substrate to obtain a battery cover;

[0012] S3. Take a shell, place the battery cover on the opening of the shell, make the side panels fit or close to the inner wall or outer wall of the shell, and weld the shell and the side panels of the battery cover together by laser welding.

[0013] In the present invention, side plates are arranged around the substrate body, which can facilitate the welding of the electrode substrate and the battery shell, and can increase the rigidity of the electrode substrate, so that the electrode substrate has stronger anti-bending performance. The thickness of the electrode substrate can be thinned while the anti-bending performance remains unchanged. It is suitable for the cover plate of the battery shell of secondary batteries such as blade batteries that have higher requirements on the shell performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] 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:

[0015] FIG1(a) and FIG1(b) are schematic diagrams of two battery cover and shell welding methods in the prior art.

[0016] FIG2 is a schematic structural diagram of an embodiment of a battery housing according to the present invention.

[0017] FIG3 is a schematic structural diagram of the second narrow side surface of the housing.

[0018] FIG4 is a top view of the battery cover.

[0019] FIG5 is a schematic cross-sectional view of the section AA in FIG4 .

[0020] FIG6 is an enlarged view of point B in FIG5.

[0021] FIG7 is a schematic diagram of a method for welding a battery cover and a battery shell after adopting the structure of this embodiment.

[0022] Figure 8 and Figure 9 are exploded views of the battery cover.

[0023] 10 and 11 are schematic structural diagrams of the electrode substrate after the first boss is provided.

[0024] FIG12 is a schematic structural diagram of the electrode retaining frame after the second boss is provided.

[0025] 13 and 14 are schematic structural diagrams of the electrode substrate after the third boss is provided.

[0026] FIG15 is a schematic structural diagram of the electrode stop frame after the substrate positioning groove is provided.

[0027] FIG16 is a flow chart of an embodiment of a method for manufacturing a battery casing according to the present invention.

[0028] The meanings of the reference numerals in the accompanying drawings are:

[0029] Battery cover plates 100, 100a, 100b; electrode substrate 101; front surface 102; back surface 103; substrate body 110; electrode through-hole 111; side plate 112; overlap 113; first liquid injection hole 114; first convex bump 115; first boss 116; first groove 117; third boss 118; third groove 119; electrode column 120; electrode column base 121; columnar portion 122; sealing ring 130; large ring 131; small ring 132; electrode retainer 140; first clearance hole 141; Second liquid injection hole 142; second boss 143; pole positioning groove 144; substrate positioning groove 145; isolation plate 150; second clearance hole 151; pressure plate positioning groove 152; second convex bump 153; isolation plate positioning hole 154; electrode pressure plate 160; third clearance hole 161; pressure plate positioning hole 162; shell 200; first opening 201; second opening 202; first weld 203; wide side 210; first narrow side 220; second weld 221; second narrow side 230; explosion-proof notch 231. DETAILED DESCRIPTION

[0030] 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 unless there is any conflict.

[0031] Example 1

[0032] Referring to FIG. 2 , the present invention discloses an embodiment of a battery casing. The battery casing of this embodiment includes a cylindrical shell 200 . The shell 200 can be made of stainless steel with a thickness of 0.1 mm to 0.3 mm and has explosion-proof notches formed thereon by laser etching. In this embodiment, the shell 200 is made of stainless steel with a thickness of 0.18 mm and is a thin, rectangular cylindrical shape. The shell 200 includes two opposing wide sides 210 and an opposing first narrow side 220 and a second narrow side 230 . A second weld 221 is provided on the first narrow side 220 .

[0033] Referring to Figure 3 , in this embodiment, the explosion-proof notch 231 is provided on the second narrow side surface 230 . Of course, the explosion-proof notch 231 can also be provided on other sides of the housing 200 . The notch residual value of the explosion-proof notch 231 is 0.01 mm to 0.08 mm (the notch residual value of the explosion-proof notch 231 is defined as the thickness of the housing 200 remaining after etching and thinning at the explosion-proof notch 231 ). For example, the notch residual value of the explosion-proof notch 231 can be 0.06 mm. The explosion-proof notch 231 is shaped like a curve with a notch formed by cutting off a section of a closed curve. The linear width of the notch is generally 1 mm to 5 mm.

[0034] The housing 200 is provided with an opening at each of its upper and lower ends, with a battery cover 100 fixedly mounted at each opening. Specifically, the upper end of the housing 200 is provided with a first opening 201, with the battery cover 100a mounted thereon; the lower end of the housing 200 is provided with a second opening 202, with the battery cover 100b mounted thereon. The battery covers (100a, 100b) include an electrode substrate 101 and an electrode assembly mounted on the electrode substrate 101.

[0035] Referring to Figures 4, 5, and 6, the electrode substrate 101 includes a substrate body 110. To reduce the thickness of the electrode substrate 101, the substrate body 110 can be made of stainless steel, with a thickness d2 of stainless steel typically ranging from 0.2 mm to 0.5 mm. In the prior art, the substrate body 110 is typically made of aluminum with a thickness of 2 mm. In this embodiment, the substrate body 110 is made of stainless steel with a thickness d2 of 0.3 mm, significantly reducing the thickness of the electrode substrate 101. This helps reduce the weight of the housing 200, saves material, and reduces costs.

[0036] The electrode substrate 101 further includes a side panel 112 formed by a stamping process around the substrate body 110 and bent outward (i.e., away from the housing). The angle θ between the side panel 112 and the substrate body 110 is generally 90°≤θ≤95°. In this embodiment, the angle θ is 91°≤θ≤92°. The wall thickness of the side panel 112 can be the same as that of the substrate body 110. The overall size of the side panel 112 is adapted to the size of the internal cavity of the housing 200. The side panel 112 is in contact with or close to the inner wall of the housing 200 and is welded to the housing 200.

[0037] Of course, the side panel 112 can also be formed by bending and extending the four sides of the substrate body 110 inward (i.e., toward the shell) through a stamping process. The size of the cavity formed by the inner wall of the side panel 112 is adapted to the overall size of the shell 200, so that the side panel 112 can be assembled on the outer wall of the shell 200 and welded to the shell 200.

[0038] Continuing with FIG6 , a horizontally outwardly bent and extended lap 113 can be formed at the end of the side panel 112 away from the housing 200 through a stamping process. The lap 113 is parallel to the substrate body 110. The side panel 112 and the lap 113 can be simultaneously formed on the substrate body 110 through a single stamping process. During welding, the lap 113 can be placed on the upper edge of the side wall of the housing 200 to facilitate positioning of the battery cover plates (100a, 100b). The width L1 of the lap 113 is adapted to the wall thickness of the housing 200, and the vertical spacing L2 between the lap 113 and the substrate body 110 is 0.2 mm to 0.5 mm. The spacing L2 between the lower end surface of the lap 13 and the upper end surface of the substrate body 10 is consistent with the thickness d2 of the substrate body 10. In this embodiment, the width L1 of the overlap 113 is 0.2 mm, which is slightly larger than the wall thickness of the shell 200 of 0.18 mm; the spacing L2 is 0.3 mm, which facilitates the alignment of the laser with the welding position during welding, so that the laser irradiation range during welding is within the weldable area. In addition, the outer edge of the overlap 113 can also be welded to the outer wall of the shell 200 to form a first weld 203, thereby sealing the seam between the overlap 113 and the shell 200 to achieve an aesthetic effect. Of course, the lower end of the overlap 113 can also be directly welded to the upper side wall of the shell 200 through a laser welding process to form a whole, which not only achieves an aesthetic effect, but also increases the welding strength between the battery cover (100a, 100b) and the shell 200.

[0039] Referring to Figure 7 , welding the side panels 112 to the housing 200 increases the weldable area, facilitating process implementation. It also increases the distance required for the laser to penetrate the housing 200, thereby preventing melting of the housing 200 due to excessively thin walls. Furthermore, forming the side panels 112 around the substrate body 110 increases the rigidity of the electrode substrate 101, providing it with greater resistance to bending and flexing, thereby overcoming the reduced rigidity associated with using thinner materials.

[0040] Referring to Figures 8 and 9 , the electrode substrate 101 has a front surface 102 and a back surface 103 that are oppositely disposed, with the back surface 103 facing the housing 200. The electrode substrate 101 is provided with an electrode through-hole 111 that passes through both the front surface 102 and the back surface. The electrode assembly includes an electrode column 120 that passes through the electrode through-hole 111, an upper isolator that isolates the front surface 102 of the electrode substrate 101 from the electrode column 120, a sealing ring 130 that isolates the hole wall of the electrode through-hole 111 from the electrode column 120, and a lower isolator that isolates the back surface 103 of the electrode substrate 101 from the electrode column 120. The sealing ring 130 is generally made of a rubber material (e.g., fluororubber), and the electrode column 120 is disposed within the sealing ring 130. The upper isolating member is defined as an isolating plate 150. An electrode pressing plate 160 is pressed against the front surface of the isolating plate 150 (i.e., the end surface of the isolating plate 150 facing the same direction as the front surface 102 of the electrode substrate 101). The electrode pressing plate 160 is used to press-fit the electrode column 120 onto the electrode substrate 101. The lower isolating member is defined as an electrode retaining frame 140. The electrode retaining frame 140 is attached to the back surface 103 of the electrode substrate 101. The electrode retaining frame 140 is generally made of polyurethane through an injection molding process, while the electrode pressing plate 160 is generally made of aluminum through a stamping process.

[0041] The electrode column 120 of the battery cover 100a is the positive electrode of the battery. The electrode column 120 is generally made of aluminum through a stamping process. The separator 150 of the battery cover 100a can be made of a plastic material with weak conductivity (e.g., conductive PPS) through an injection molding process. The electrode column 120 of the battery cover 100b is the negative electrode of the battery. The electrode column 120 is generally made of copper through a stamping process. The separator 150 of the battery cover 100b is made of an insulating plastic material (e.g., insulating PPS) through an injection molding process.

[0042] The electrode substrate 101 is attached to the front surface of the electrode stopper 140 (i.e., the end surface of the electrode stopper 140 facing the same direction as the front surface 102 of the electrode substrate 101). The electrode stopper 140 is provided with a first clearance hole 141 at a position corresponding to the electrode through hole 111. The isolation plate 150 is attached to the front surface 102 of the electrode substrate 101. The isolation plate 150 is provided with a second clearance hole 151 at a position corresponding to the electrode through hole 111. The electrode pressure plate 160 is provided with a third clearance hole 161 at a position corresponding to the second clearance hole 151. The first clearance hole 141, the electrode through hole 111, and the second clearance hole 151 form a cavity for mounting the sealing ring 130, within which the sealing ring 130 is mounted. The electrode column 120 includes a pole base 121 and a cylindrical portion 122 provided on the pole base 121. The cylindrical portion 122 passes through the sealing ring 130 from the outside to the inside and extends into the third clearance hole 161, and is riveted to the electrode pressure plate 160. The sealing ring 130 generally has a stepped structure, including a large ring 131 and a small ring 132. The large ring 131 is located in the first clearance hole 141, one end of the large ring 131 is tightly abutted against the pole base 121, and the other end of the large ring 131 is tightly abutted against the substrate body 110. The small ring 132 is located in the electrode through hole 111 and the second clearance hole 151, and one end of the small ring 132 is tightly abutted against the electrode pressure plate 160.

[0043] The battery cover 100a also has a first liquid injection hole 114 defined on the substrate body 110, and a second liquid injection hole 142 defined on the electrode retainer 140 of the battery cover 100a at a position corresponding to the first liquid injection hole 114. Liquid can be injected into the housing 200 through the through-hole formed by the first liquid injection hole 114 and the second liquid injection hole 142. The battery cover 100b does not have the first liquid injection hole 114 or the second liquid injection hole 142 defined on the substrate body 110 and the electrode retainer 140.

[0044] To facilitate positioning of the electrode pressure plate 160, the front surface of the isolation plate 150 is generally provided with a pressure plate positioning groove 152. The electrode pressure plate 160 extends into the pressure plate positioning groove 152, thereby preventing the electrode pressure plate 160 from rotating or shifting. To facilitate positioning of the electrode column 120, the back surface of the electrode stopper 140 (i.e., the end surface of the electrode stopper 140 facing the same direction as the back surface 103 of the electrode substrate 101) is generally provided with a pole positioning groove 144. The shape of the pole positioning groove 144 matches the shape of the pole base 121. The pole base 121 is positioned in the pole positioning groove 144, thereby preventing the electrode column 120 from rotating or shifting. To prevent the electrode stopper 140 from being too thick, the depth of the pole positioning groove 144 is generally less than the thickness of the pole base 121, thereby allowing the pole base 121 to protrude outward from the back surface of the electrode stopper 140.

[0045] The substrate body 110 also has a protruding structure formed upward or downward around the electrode through-hole 111 through a stamping process. In this embodiment, the protruding structure includes two outwardly protruding first bumps 115 formed through a stamping process on the front surface 102 of the substrate body 110; the two first bumps 115 are symmetrically arranged on either side of the electrode through-hole 111. Of course, more first bumps 115 may be provided on the substrate body 110. A respective isolation plate positioning hole 154 is provided on the back surface of the isolation plate 150 (i.e., the end surface of the isolation plate 150 facing in the same direction as the back surface 103 of the electrode substrate 101), corresponding to each first bump 115. The two first bumps 115 extend into the two isolation plate positioning holes 154, respectively. Thus, the two first bumps 115 and the two isolation plate positioning holes 154 form an anti-torsion structure that prevents the isolation plate 150 from rotating, thereby preventing rotational displacement of the isolation plate 150.

[0046] The isolation plate positioning holes 154 are blind holes. To avoid increasing the thickness of the isolation plate 150 due to the provision of the isolation plate positioning holes 154, a second convex bump 153 can be provided on the front surface of the isolation plate 150 at a position corresponding to each isolation plate positioning hole 154. At the same time, a pressure plate positioning hole 162 is provided on the back surface of the electrode pressure plate 160 (i.e., the end surface of the electrode pressure plate 160 that is in the same direction as the back surface 103 of the electrode substrate 101) at a position corresponding to each second convex bump 153. The pressure plate positioning holes 162 are blind holes, and each second convex bump 153 extends into the corresponding pressure plate positioning hole 162. The provision of the second convex bump 153 allows the isolation plate 150 to maintain its previous thickness (excluding the thickness of the second convex bump 153) after the isolation plate positioning holes 154 are provided, and the second convex bump 153 can further position the electrode pressure plate 160.

[0047] Referring to Figures 10, 11, and 12, the raised structure may also include a first boss 116 protruding outward from the front surface 102 of the substrate body 110. The first boss 116 is formed by stamping the entire area surrounding the electrode through-hole 111 of the substrate body 110 outward from the front surface 102. The first bumps 115 are all located on the first bosses 116. Specifically, the first bosses 116 are first formed by stamping, and then the first bumps 115 are stamped on the first bosses 116. Forming the first bosses 116 on the substrate body 110 significantly increases the thickness of the battery substrate cross-section, thereby increasing the rigidity of the electrode substrate 101. While the first bosses 116 are being stamped, the back surface 103 of the substrate body 110 corresponding to the first bosses 116 is also recessed inward to form a first groove 117. The dimensions of the first groove 117 are larger than those of the terminal base 121. A second, outwardly protruding boss 143 is provided on the front of the electrode retaining frame 140 at a position corresponding to the first groove 117. A pole positioning groove 144 is formed on the back of the electrode retaining frame 140 at a position corresponding to the second boss 143. The shape of the pole positioning groove 144 matches the shape of the pole base 121. The second boss 143 extends into the first groove 117, and the pole base 121 is located in the pole positioning groove 144, with the end surface of the pole base 121 flush with the back of the electrode retaining frame 140. Since the front surface of the electrode stop frame 140 is provided with a second protruding boss 143, the thickness at the second boss 143 is increased. Therefore, the pole positioning groove 144 provided at the position corresponding to the second boss 143 on the back surface of the electrode stop frame 140 can have a greater depth, so that the pole base 121 can be located in the pole positioning groove 144 as a whole, thereby moving the pole base 121 outward as a whole, increasing the volume of the internal cavity of the shell 200, and being able to accommodate more battery cells.

[0048] In this embodiment, the shell 200 is made of stainless steel, which can significantly reduce the thickness of the shell 200, reduce the weight of the shell 200, and facilitate etching to form the explosion-proof notch 231, thereby simplifying the structure of the explosion-proof notch 231. Side panels 112 and overlaps 113 are formed around the substrate body 110. The overlaps 113, side panels 112, and substrate body 110 form a Z-shaped structure, which can facilitate welding of the shell 200 to the side panels 112 of the electrode substrate 101; it can also increase the rigidity of the electrode substrate 101. By forming a first boss 116 around the electrode through-hole 111, the rigidity of the electrode substrate 101 can be further enhanced, thereby making the electrode substrate 101 have a strong anti-bending performance. The thickness of the electrode substrate 101 can be significantly reduced without changing the anti-bending performance, so that the electrode substrate 101 can be made of a thinner material to save costs. In addition, although the density of stainless steel is greater than that of aluminum, the weight of the battery cover is still reduced because the thickness of the material is greatly reduced. It can be used as a battery shell for secondary batteries such as blade batteries that have higher requirements on shell performance.

[0049] Example 2

[0050] Referring to Figures 13, 14, and 15, the battery housing of this embodiment differs from that of Example 1 only in the protrusion structures (i.e., first protrusion 115, first boss 116, first groove 117) and the associated structures (i.e., second protrusion 153, separator plate positioning hole 154, pressure plate positioning hole 162, second boss 143, and electrode positioning groove 144) of the battery cover plates 100a and 100b. In this embodiment, the protrusion structure includes a third boss 118 protruding outward from the back surface 103 of the substrate body 110. The third boss 118 is formed by a stamping process so that the entire area surrounding the electrode through-hole 111 of the substrate body 110 protrudes outward from the back surface 103 thereof. While the third boss 118 is formed by stamping, the front surface 102 of the substrate body 110 is recessed inward at a location corresponding to the third boss 118 to form a third groove 119. The shape of the third groove 119 matches the shape of the isolation plate 150, which is positioned within the third groove 119. A substrate positioning groove 145 is provided on the front surface of the electrode stopper 140 at a location corresponding to the third boss 118. The third boss 118 extends into the substrate positioning groove 145. Thus, the third boss 118, substrate positioning groove 145, and third groove 119 form an anti-torsion structure that prevents the electrode stopper 140 and isolation plate 150 from rotating. This anti-torsion structure positions the electrode stopper 140 and isolation plate 150, preventing them from rotating and shifting. To prevent the electrode stopper 140 from being too thin at the substrate positioning groove 145, the pole positioning groove 144 is omitted in this embodiment. Of course, the electrode positioning groove 144 may be retained and the overall thickness of the electrode stopper 140 may be increased, which can also prevent the electrode stopper 140 from being too thin at the substrate positioning groove 145 .

[0051] In this embodiment, by using a stamping process to form a third boss 118 on the substrate body 110, the rigidity of the electrode substrate 101 can also be enhanced, so that the electrode substrate 101 has better anti-bending performance, and the isolation plate 150 can be positioned without setting the first convex bump 115, and the structure is simpler.

[0052] The present invention further discloses an electrode substrate, the structure of which may be the structure of the electrode substrate 101 in the battery cover of any embodiment of the battery housing.

[0053] The present invention further discloses a battery cover, the structure of which may be the structure of the battery cover 100a or the battery cover 100b in any of the above-mentioned embodiments of the battery housing.

[0054] Please refer to FIG16, which is a flow chart of a method for manufacturing a battery casing according to an embodiment of the present invention. The method for manufacturing a battery casing according to this embodiment includes the following steps:

[0055] S1. Continuing to refer to Figures 4, 5, and 6, a circle of upwardly or downwardly bent side panels 112 are formed around the substrate body 110 by a stamping process to obtain an electrode substrate 101. The electrode substrate 101 has a front surface 102 and a back surface 103 that are oppositely disposed. In this step, to facilitate the installation of the electrode assembly, an electrode through-hole 111 may be further provided on the electrode substrate 101, penetrating the front surface 102 and the back surface.

[0056] Please continue to refer to Figure 6. In this step, the upper end of the side panel 112 can be bent outward and extended to form a lap 113 through a stamping process, and the lap 113 is parallel to the substrate body 110. The side panel 112 and the lap 113 can be formed simultaneously on the substrate body 110 through a single stamping process.

[0057] S2. Install the electrode assembly on the electrode substrate 101 to obtain the battery cover 100. The method of installing the electrode assembly on the electrode substrate 101 is a conventional technology and will not be described in detail here.

[0058] Continuing to refer to Figures 8 and 9, the electrode assembly includes an electrode column 120 for passing through the electrode through-hole 111, an upper isolator for isolating the front surface 102 of the electrode substrate 101 from the electrode column 120, a sealing ring 130 for isolating the hole wall of the electrode through-hole 111 from the electrode column 120, and a lower isolator for isolating the back surface 103 of the electrode substrate 101 from the electrode column 120. The electrode column 120 is passed through the sealing ring 130. The upper isolator is defined as an isolation plate 150, on which an electrode pressing plate 160 is pressed. The electrode pressing plate 160 is used to press the electrode column 120 onto the electrode substrate 101. The lower isolator is defined as an electrode stopper 140, which is disposed on the lower side of the electrode substrate 101.

[0059] The substrate body 110 also has upwardly or downwardly projecting protrusions formed around the electrode through-hole 111 through a stamping process. In this embodiment, the protrusions include two upwardly projecting first bumps 115 formed through a stamping process on the substrate body 110; the two first bumps 115 are symmetrically positioned on either side of the electrode through-hole 111. The lower end surface of the isolation plate 150 is provided with an isolation plate positioning hole 154 at a position corresponding to each first bump 115. The two first bumps 115 extend into the two isolation plate positioning holes 154, forming a torsion-resistant structure that prevents the isolation plate 150 from rotating and shifting.

[0060] Referring to Figures 10, 11, and 12, the protrusion structure may further include a first boss 116 protruding upward from the upper end surface of the substrate body 110, with the first bumps 115 located on the first boss 116. The lower end surface of the substrate body 110, at a position corresponding to the first boss 116, may further be recessed upward to form a first groove 117, with the size of the first groove 117 being larger than the size of the terminal base 121. An upwardly protruding second boss 143 is provided on the upper end surface of the electrode stopper 140 at a position corresponding to the first groove 117, and a pole positioning groove 144 is formed on the lower end surface of the electrode stopper 140 at a position corresponding to below the second boss 143. The shape of the pole positioning groove 144 is adapted to the shape of the pole base 121; the second boss 143 extends into the first groove 117; the pole base 121 is located in the pole positioning groove 144, and the lower end surface of the pole base 121 is flush with the lower end surface of the electrode stopper 140.

[0061] Referring to Figures 13, 14, and 15, in another embodiment, the protrusion structure and its associated structures may also employ another configuration. For example, the protrusion structure may be a third boss 118 projecting downward from the lower end surface of the substrate body 110. The third boss 118 is formed by stamping the entire area surrounding the electrode through-hole 111 of the substrate body 110 downwardly. While the third boss 118 is being formed by stamping, the upper end surface of the substrate body 110 corresponding to the third boss 118 is also recessed downward to form a third groove 119. The shape of the third groove 119 matches that of the isolation plate 150, which is disposed within the third groove 119. A substrate positioning groove 145 is provided on the upper end surface of the electrode stop frame 140 at a position corresponding to the third boss 118, and the third boss 118 extends into the substrate positioning groove 145; thereby, an anti-torsion structure is formed by the third boss 118, the substrate positioning groove 145 and the third groove 119 to prevent the electrode stop frame 140 and the isolation plate 150 from rotating.

[0062] The housing 200 in this embodiment is cylindrical, with a first opening at the upper end and a second opening at the lower end. Therefore, two battery cover plates 100 are required, which are welded to the first and second openings of the housing 200, respectively. The battery cover plate 100a is welded to the first opening of the housing 200, and the battery cover plate 100b is welded to the second opening of the housing 200.

[0063] S3. Please continue to refer to Figure 2. Take a shell 200 and place the battery cover 100 at the opening of the shell 200 so that the side plate 112 is in contact with or close to the inner wall of the shell 200. The shell 200 and the side plate 112 of the battery cover 100 are welded and bonded together by a laser welding process, thereby forming a sealed cavity inside the shell 200. The shell 200 can be cylindrical, with a first opening 201 provided at the upper end of the shell 200 and a second opening 202 provided at the lower end. The shell 200 can be made of stainless steel with a thickness of 0.1mm to 0.3mm, and explosion-proof notches are formed on the shell 200 by laser etching.

[0064] Please continue to refer to Figure 7. When using the laser welding process, the shell 200 is placed vertically, and the laser is irradiated obliquely upward to align the laser irradiation direction with the position on the shell 200 corresponding to the side plate 112. The use of the laser irradiation method can increase the distance required for the laser to penetrate the shell 200, thereby preventing the shell 200 from melting during the welding process due to the thin wall thickness. The angle between the laser irradiation direction and the horizontal direction is 45°±20°, preferably The distance between the light exit hole of the laser device and the welding point of the housing 200 is 1 mm to 15 mm, preferably 8 mm to 10 mm.

[0065] In this embodiment, the housing 200 is made of stainless steel with a thickness of 0.18 mm (i.e., the wall thickness of the housing 200 is d1 = 0.18 mm); correspondingly, the width of the overlap 113 is L1 = 0.2 mm, slightly larger than the wall thickness of the housing 200. As can be seen from Figure 7, if welding is performed at the overlap 113 to the housing 200, the width of the weldable area is L1, i.e., 0.2 mm. The corresponding angle of the laser irradiation range is β, which is relatively small, making it difficult to consistently control the laser irradiation range within this range during the welding process. If welding is performed at the side panel 112 to the housing 200, the width of the weldable area is L2 + d2 = 0.6 mm, thereby increasing the angular range of the laser irradiation during the welding process. Continuing with Figure 7, in this case, the angular range of the laser irradiation during the welding process is α, which is relatively large and can easily control the laser irradiation range within this range, facilitating process implementation. Of course, in this step, the outer edge of the overlap 113 can also be welded to the outer side wall of the shell 200 by a laser welding process to form a first weld 203, so that the seam between the overlap 113 and the shell 200 can be closed to achieve an aesthetic effect. Of course, the lower end of the overlap 113 and the upper side wall of the shell 200 can also be welded as a whole by a laser welding process using a laser irradiation method that is still inclined upward, that is, the laser irradiation range during the welding process includes the range corresponding to the β angle and part of the α angle range adjacent to the β angle. This not only achieves an aesthetic effect, but also increases the welding strength between the battery cover (100a, 100b) and the shell 200, and except for the laser irradiation angle, the other process parameters of the two laser weldings can be consistent, making the process implementation more convenient.

[0066] Since two battery cover plates 100 need to be welded to the housing 200 in this embodiment, in this step, the battery cover plate 100a is first placed on the first opening of the housing 200, and the side plate 112 of the battery cover plate 110a is welded and fixed to the housing 200 using a laser welding process. Then, the housing 200 is turned over so that its second opening faces upward, and the battery cover plate 100b is placed on the second opening of the housing 200, and the side plate 112 of the battery cover plate 100b is welded and fixed to the housing 200 using a laser welding process.

[0067] In this embodiment, the four sides of the substrate body 110 are bent to form side panels 112 and overlapping edges 113, thereby forming a Z-shaped structure, which can facilitate welding of the shell 200 and the side panels 112 of the electrode substrate 101; it can also increase the rigidity of the electrode substrate 101. By forming a first boss 116 or a third boss 118 around the electrode through hole 111, the rigidity of the electrode substrate 101 can be further enhanced, so that the electrode substrate 101 has a strong anti-bending performance, and the thickness of the electrode substrate 101 can be greatly reduced, so that the electrode substrate 101 can be made of thinner materials.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions, which should all be included in the scope of the claims of the present invention.

Claims

1. An electrode substrate for assembling an electrode column of a battery, comprising a substrate body, characterized in that: It also includes side plates arranged around the base body, the side plates are attached to or close to the inner wall or outer wall of the battery shell and are welded to the battery shell.

2. The electrode substrate according to claim 1, characterized in that: The side plate is formed by bending and extending from the outer periphery of the substrate body; the upper end surface of the side plate is higher than the upper side surface of the substrate body and / or the lower end surface of the side plate is lower than the lower side surface of the substrate body.

3. The electrode substrate according to claim 2, characterized in that: The side plate is used to be assembled on the inner side wall of the battery housing, and the side plate is formed by bending and extending upward from the outer side surface of the substrate body.

4. The electrode substrate according to claim 3, characterized in that: The upper end of the side plate is bent outward and extends to form a lap edge, and the distance between the lower end surface of the lap edge and the upper end surface of the base plate body is 0.2 mm to 0.5 mm.

5. The electrode substrate according to claim 1, wherein: The substrate body is made of stainless steel with a thickness of 0.2 mm to 0.5 mm.

6. The electrode substrate according to claim 1, wherein: The included angle between the side plate and the base plate body is 90° to 95°.

7. The electrode substrate according to claim 6, characterized in that: The included angle between the side plate and the base plate body is 91° to 92°.

8. The electrode substrate according to any one of claims 1 to 7, characterized in that: The substrate body is provided with a protruding structure protruding upward and / or downward.

9. A battery cover, characterized in that: It comprises an electrode substrate as described in any one of claims 1 to 8 and an electrode assembly assembled on the electrode substrate; the electrode substrate has a front side and a back side arranged opposite to each other, the electrode substrate is provided with an electrode through hole penetrating the front side and the back side thereof, the electrode assembly comprises an electrode column penetrating the electrode through hole, an upper isolating member for isolating the front side of the electrode substrate from the electrode column, a sealing ring for isolating the hole wall of the electrode through hole from the electrode column, and a lower isolating member for isolating the back side of the electrode substrate from the electrode column.

10. The battery cover as claimed in claim 9, 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 arranged on the lower side of the electrode substrate; 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 first clearance through hole, the electrode through hole and the second clearance through hole form a sealing ring installation cavity, and the sealing ring is arranged in the sealing ring installation cavity; the electrode column includes a pole base and a columnar portion arranged on the pole base, and the columnar portion passes through the sealing ring from bottom to top and extends into the third clearance through hole, and is fixedly connected to the electrode pressing plate.

11. The battery cover as claimed in claim 10, characterized in that: The electrode column is the positive electrode of the battery, and the separator is made of a weakly conductive material; or The electrode column is the negative electrode of the battery, and the isolation plate is made of insulating material.

12. The battery cover as claimed in claim 10, characterized in that: At least two first bulges protruding upward are formed on the substrate body by a stamping process, and at least two of the first bulges are located below the isolation plate; an isolation plate positioning hole is respectively provided on the lower end surface of the isolation plate corresponding to each first bulge, and each of the first bulges extends into the corresponding isolation plate positioning hole.

13. The battery cover as claimed in claim 12, characterized in that: The upper end surface of the substrate body is provided with a first boss protruding upward, and the first convex bump is located on the first boss; the first boss is formed by a stamping process so that the surrounding area of ​​the electrode through hole of the substrate body protrudes upward as a whole, and the stamping process simultaneously causes the position of the lower end surface of the substrate body corresponding to the first boss to be recessed upward to form a first groove; the size of the first groove is larger than the size of the pole base, and the position of the upper end surface of the electrode stop frame corresponding to the first groove is provided with a second boss protruding upward, and the second boss extends into the first groove; and a pole positioning groove is formed at a position below the lower end surface of the electrode stop frame corresponding to the second boss, and the shape of the pole positioning groove is adapted to the shape of the pole base; the pole base is located in the pole positioning groove, and the lower end surface of the pole base is flush with the lower end surface of the electrode stop frame.

14. The battery cover as claimed in claim 10, characterized in that: The anti-torsion structure includes a third boss protruding downward from the lower end surface of the substrate body, and the third boss is formed by a stamping process to make the area around the electrode through hole of the substrate body protrude downward as a whole; the stamping process simultaneously causes the upper end surface of the substrate body to be recessed downward at a position corresponding to the third boss to form a third groove; the shape of the third groove is adapted to the shape of the isolation plate, and the isolation plate is arranged in the third groove; a substrate positioning groove is arranged at a position on the upper end surface of the electrode stop frame corresponding to the third boss, and the third boss extends into the substrate positioning groove.

15. A battery housing, characterized in that: It comprises a cylindrical shell, wherein at least one opening is arranged on the shell, and a battery cover plate as claimed in any one of claims 9 to 14 is fixedly arranged at each of the openings.

16. The battery housing according to claim 15, characterized in that: The side plate is assembled on the inner side wall of the shell, and is formed by bending and extending from the outer side surface of the substrate body in a direction away from the shell.

17. The battery housing according to claim 16, wherein: The width of the overlapped edge is adapted to the wall thickness of the shell, and the outer edge of the overlapped edge is welded to the outer side wall of the shell to form a first weld; and / or The lower end of the overlapped edge is welded to the upper side wall of the shell.

18. The battery housing according to claim 15, characterized in that: The shell is made of stainless steel with a thickness of 0.1 mm to 0.3 mm, and explosion-proof notches are formed on the shell by laser etching.

19. The battery case according to any one of claims 15 to 18, characterized in that: The shell is a thin rectangular tube as a whole, and an opening is provided at the upper and lower ends of the shell respectively; the shell includes two wide sides arranged opposite to each other and a first narrow side and a second narrow side arranged opposite to each other; a second weld is provided on the first narrow side; and an explosion-proof notch is provided on the second narrow side.

20. A method for manufacturing a battery shell, used for manufacturing the battery shell according to any one of claims 15 to 19, characterized in that: The following steps are involved: S1. Form a circle of side plates bent upward or downward around the substrate body by a stamping process to obtain an electrode substrate; S2, installing an electrode assembly on an electrode substrate to obtain a battery cover; S3. Take a shell, place the battery cover plate on the opening of the shell, make the side plate fit or be close to the inner wall or outer wall of the shell, and weld and bond the shell and the side plate of the battery cover plate by laser welding process.

21. The method for manufacturing a battery casing according to claim 20, characterized in that: In the step S1, the side plate is formed by bending and extending upward from the outer side surface of the substrate body through a stamping process, and the upper end of the side plate is bent and extended outward to form a lap edge through a stamping process; the width of the lap edge is adapted to the wall thickness of the battery housing; In the step S3, when the battery cover is placed at the opening of the shell, the overlap is in contact with the upper end of the shell, and the side plate is assembled on the inner wall of the shell; and the outer edge of the overlap is welded to the outer wall of the shell by a laser welding process to form a first weld; and / or The lower end of the overlapped edge is welded to the upper side wall of the shell by laser welding process.

22. The method for manufacturing a battery casing according to claim 20, characterized in that: In the S3 step, when the laser welding process is adopted, the shell is placed vertically, and the irradiation direction of the laser is aligned with the position on the shell corresponding to the side panel. The angle between the irradiation direction of the laser and the horizontal direction is 45°±20°, and the distance between the light outlet hole of the laser device and the welding point of the shell is 1mm~15mm.

23. The method for manufacturing a battery casing according to claim 22, characterized in that: In the step S3, when the laser welding process is adopted, the distance between the light outlet hole of the laser device and the welding point of the shell is 8 mm to 10 mm.

24. The method for manufacturing a battery casing according to claim 20, characterized in that: The shell is cylindrical, with a first opening at the upper end of the shell and a second opening at the lower end of the shell; in the step S3, a battery cover is first placed at the first opening of the shell, and the shell is welded and fixed to the side plate of the battery cover by a laser welding process; then the shell is turned over so that its second opening faces upward, another battery cover is placed at the second opening of the shell, and the shell is welded and fixed to the side plate of the battery cover by a laser welding process.

25. The method for manufacturing a battery casing according to claim 20, characterized in that: In the S1 step, an electrode through hole is also opened on the electrode substrate, passing through the front and back surfaces thereof; the electrode assembly includes an electrode column for passing through the electrode through hole, an upper insulating member for isolating the front surface of the electrode substrate from the electrode column, a sealing ring for isolating the hole wall of the electrode through hole from the electrode column, and a lower insulating member for isolating the back surface of the electrode substrate from the electrode column.

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