Secondary battery, secondary battery manufacturing method, and electronic device

Abstract

The application relates to the technical field of batteries, in particular to a secondary battery, a secondary battery manufacturing method and an electronic device. The secondary battery comprises a battery can, a battery core, a first adapter sheet and a cover plate, the battery core is arranged in the battery can, the first adapter sheet comprises an adapter part and a first connecting part, the first connecting part is arranged on the side of the adapter part, and the adapter part is electrically connected with the battery core; the cover plate covers the opening of the battery can, the adapter part is arranged between the cover plate and the battery core, and the first connecting part is at least partially arranged between the cover plate and the side wall; the connecting strength of the three parts can be ensured by fixedly connecting the first connecting part with the cover plate and the side wall, laser welding fixation is not needed, laser burn of the battery can is avoided, and the stability of the secondary battery is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a secondary battery, a secondary battery manufacturing method and an electronic device. BACKGROUND

[0002] The secondary battery is also called a rechargeable battery or a storage battery, which refers to a battery that can be activated by charging after discharging and can continue to be used. The secondary battery can be applied to power batteries of electric vehicles, batteries of electronic products, etc. The cylindrical battery gradually becomes the main battery scheme of the power battery due to its high energy density. The cylindrical battery mainly includes a battery can, a battery core, a cover plate and a pole, wherein the first end of the battery can is in an open shape, a through hole is arranged on the end face of the second end of the battery can; the battery core is arranged in the battery can, the first tab of the battery core faces the first end of the battery can, and the second tab of the battery core faces the second end of the battery can; the cover plate is arranged on the first end of the battery can; part of the pole extends into the through hole and is electrically connected with the second tab of the battery core.

[0003] At present, the existing cylindrical battery production process mainly includes the following steps: the pole is connected and fixed with the through hole of the battery can through riveting, and the positive pole of the battery core is connected with the positive pole adapter plate; the battery can and the negative tab of the battery core are electrically connected through the negative pole adapter plate, and the battery can itself serves as the negative pole of the cylindrical battery. In this process, the negative pole adapter plate is first connected with the battery can through laser welding, and then the battery can is sealed with the cover plate. However, when the negative pole adapter plate and the battery can are laser welded, the laser may burn through the battery can, causing battery leakage, and thus affecting the stability of the cylindrical battery.

[0004] Therefore, there is an urgent need for a secondary battery to solve the above problems. SUMMARY

[0005] The first object of the present application is to provide a secondary battery, which can ensure the connection strength between the side wall of the battery can and the adapter plate, avoid laser damage to the battery can, and improve the stability of the secondary battery.

[0006] The second object of the present application is to provide a manufacturing method of a secondary battery, which has simple process steps and can improve the stability of the secondary battery.

[0007] The third object of the present application is to provide an electronic device, which has more stable performance by using the above-mentioned secondary battery.

[0008] To achieve the above objects, the following technical solutions are provided:

[0009] In a first aspect, a secondary battery is provided, comprising:

[0010] A battery can includes a side wall, one end of the side wall includes an opening;

[0011] an electric core, the electric core is arranged in the battery can;

[0012] a first adapter, the first adapter is arranged at the opening end of the sidewall, the first adapter comprises an adapter part and a first connecting part, the first connecting part is arranged at the periphery of the adapter part, the adapter part is electrically connected with the electric core;

[0013] a cover plate, the cover plate covers the opening, the adapter part is arranged between the cover plate and the electric core, the first connecting part is at least partially arranged between the cover plate and the sidewall, and the first connecting part is fixedly connected with the cover plate and the sidewall.

[0014] As an optional solution of the secondary battery, the cover plate comprises a cover part and a second connecting part, the second connecting part is arranged at the periphery of the cover part, and the first connecting part is fixedly connected with the second connecting part and the sidewall.

[0015] As an optional solution of the secondary battery, the sidewall comprises a third connecting part, the third connecting part is located at the opening end of the sidewall, and the first connecting part is fixedly connected with the second connecting part and the third connecting part.

[0016] As an optional solution of the secondary battery, the first connecting part and the second connecting part are wound and fixed outside the third connecting part.

[0017] As an optional solution of the secondary battery, the first connecting part and the third connecting part are wound and fixed outside the second connecting part.

[0018] As an optional solution of the secondary battery, the sidewall further comprises a step surface and a main body part, the step surface is connected between the third connecting part and the main body part, and the step surface extends in the axial direction of the battery can.

[0019] As an optional solution of the secondary battery, the step surface is an annular surface, and the difference between the inner diameter and the outer diameter of the annular surface is 0.6mm-6mm.

[0020] As an optional solution of the secondary battery, a sealing layer is arranged between the second connecting part and the first connecting part.

[0021] As an optional solution of the secondary battery, the sealing layer is sealing glue or a sealing ring.

[0022] In a second aspect, a secondary battery manufacturing method is provided for processing the secondary battery according to any one of the above solutions, the first adapter to be assembled comprises an adapter part and a first flange, the first flange is arranged at the periphery of the adapter part; the secondary battery manufacturing method comprises:

[0023] The first adapter plate is assembled on the battery cell in the battery can, and the adapter part is fixedly connected with the tab of the battery cell.

[0024] The cover plate is assembled on the first adapter plate to be assembled.

[0025] The side wall of the battery can, the first crimping part and the second crimping part are crimped to fixedly connect the first crimping part with the cover plate and the side wall.

[0026] As an optional solution of the secondary battery manufacturing method, in the cover plate assembling step, the cover plate to be assembled comprises a cover part and a second crimping part, the second crimping part is protruded on the circumferential side of the cover part, and a sealing layer is arranged between the second crimping part and the first crimping part.

[0027] As an optional solution of the secondary battery manufacturing method, in the cover plate assembling step, the sealing layer is arranged by applying sealing glue on the surface of the second crimping part facing the first crimping part, or applying sealing glue on the surface of the first crimping part facing the second crimping part, or applying sealing glue on the two opposite surfaces of the first crimping part and the second crimping part, or arranging a sealing ring between the second crimping part and the first crimping part.

[0028] As an optional solution of the secondary battery manufacturing method, after the cover plate assembling step, before the crimping step, the secondary battery manufacturing method further comprises: battery can necking, necking the second end of the side wall of the battery can to make the second end of the side wall fit the first crimping part.

[0029] In a third aspect, an electronic device is provided, comprising the secondary battery according to any one of the above solutions.

[0030] Compared with the prior art, the secondary battery has the following advantages:

[0031] The secondary battery comprises a battery can, a battery cell, a first adapter plate and a cover plate. The battery cell is arranged in the battery can. The first adapter plate comprises an adapter part and a first connecting part. The first connecting part is arranged on the circumferential side of the adapter part. The adapter part is electrically connected with the battery cell. The cover plate covers the opening of the battery can. The adapter part is arranged between the cover plate and the battery cell. The first connecting part is at least partially arranged between the cover plate and the side wall. The first connecting part is fixedly connected with the opening side of the cover plate and the side wall. The connection strength of the three parts is guaranteed. Laser welding is not needed. The battery can is not burned by laser. The stability of the secondary battery is improved.

[0032] The manufacturing method of the secondary battery is simple in process steps and can improve the stability of the secondary battery.

[0033] The electronic device provided by the application has more stable performance by using the secondary battery. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments of the present application will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of the contents of the embodiments of the present application and the drawings.

[0035] Figure 1 The first secondary battery provided by the embodiments of the present application is shown in the structural diagram.

[0036] Figure 2 The first secondary battery provided by the embodiments of the present application is shown in the structural diagram. Figure 1 The enlarged view of A in FIG. 1;

[0037] Figure 3 The second secondary battery provided by the embodiments of the present application is shown in the structural diagram.

[0038] Figure 4 The second secondary battery provided by the embodiments of the present application is shown in the structural diagram. Figure 3 The enlarged view of B in FIG. 2;

[0039] Figure 5 The first adapter provided by the embodiments of the present application is shown in the structural diagram.

[0040] Figure 6 The cover plate provided by the embodiments of the present application is shown in the structural diagram.

[0041] Figure 7 The first adapter provided by the embodiments of the present application is shown in the structural diagram.

[0042] Figure 8 The cover plate provided by the embodiments of the present application is shown in the structural diagram.

[0043] Figure 9 The battery can provided by the embodiments of the present application is shown in the structural diagram.

[0044] Figure 10 The battery can provided by the embodiments of the present application is shown in the structural diagram.

[0045] REFERENCE NUMERALS:

[0046] 100, battery can; 101, side wall; 1011, third connecting part; 1012, step surface; 1013, main body part; 102, end wall;

[0047] 200, battery cell;

[0048] 300, first adapter sheet; 301, adapter portion; 302, first connecting portion; 303, first crimping edge;

[0049] 400, cover plate; 401, cover portion; 402, second connecting portion; 403, second crimping edge;

[0050] 500, second adapter sheet;

[0051] 600, pole;

[0052] 700, sealing layer. DETAILED DESCRIPTION

[0053] In order to make the technical problems solved by the present application, the technical solutions adopted and the technical effects achieved more clear, the technical solutions of the present application will be further described below in combination with the drawings and through specific embodiments.

[0054] In the description of the present application, unless explicitly defined and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0055] In the present application, unless explicitly defined and limited, the first feature "on" or "under" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0056] In the description of the present application, the terms "up", "down", "left", "right" and other orientation or position relationships are based on the orientation or position relationship shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.

[0057] Figure 1 The structure of the first secondary battery provided by the present application is shown. As shown in FIG. 1, the first secondary battery comprises a first adapter sheet 300, a second adapter sheet 500, a cover plate 400 and a sealing layer 700. Figure 1As shown, the secondary battery comprises a battery can 100, a battery cell 200, a first adapter tab 300, a cover plate 400, a second adapter tab 500 and a pole 600. The battery can 100 comprises a side wall 101 and an end wall 102, the side wall 101 is provided with an opening at one end, and the end wall 102 is connected to the other end of the side wall 101; the battery cell 200 is arranged in the battery can 100 from the opening end of the side wall 101; and the cover plate 400 is sealingly connected to the opening end of the side wall 101. The first adapter tab 300 is arranged in the battery can 100, and a part of the first adapter tab 300 is connected to a first tab of the battery cell 200, so as to ensure that the first adapter tab 300 is electrically connected to the first tab of the battery cell 200, and a part of the first adapter tab 300 is connected to the opening end of the side wall 101. The second adapter tab 500 is arranged in the battery can 100, and a part of the second adapter tab 500 is connected to a second tab of the battery cell 200, so as to ensure that the second adapter tab 500 is electrically connected to the second tab of the battery cell 200. The pole 600 is fixedly connected to the end wall 102 of the battery can 100, and a part of the pole 600 extends into the battery can 100 and is connected to the second adapter tab 500. Exemplarily, the pole 600 is fixed to the end wall 102 by riveting.

[0058] Optionally, the battery can 100 can be in a cylindrical structure. Of course, in other embodiments, the battery can 100 can also be in a rectangular block structure, which will not be exemplified one by one. Exemplarily, the first tab of the battery cell 200 is a negative electrode, and the second tab of the battery cell 200 is a positive electrode. The side wall 101 of the battery can 100 is connected to the negative electrode of the battery cell 200 through the first adapter tab 300, and the pole 600 is connected to the positive electrode of the battery cell 200 through the second adapter tab 500, so that the positive and negative electrodes of the secondary battery are the same.

[0059] Figure 2 An enlarged view of A in FIG. 1 is shown. Figure 1 As shown in FIG. 2, the first adapter tab 300 is connected to the negative electrode of the battery cell 200, and the second adapter tab 500 is connected to the positive electrode of the battery cell 200. Figure 2 In combination with Figure 1As shown, in the secondary battery, the first adapter piece 300 comprises an adapter portion 301 and a first connecting portion 302, the first connecting portion 302 is arranged around the periphery of the adapter portion 301, and the adapter portion 301 is connected with the first tab of the battery cell 200. The cover plate 400 comprises a cover portion 401 and a second connecting portion 402, the second connecting portion 402 is arranged around the periphery of the cover portion 401, the first connecting portion 302 is located between the second connecting portion 402 and the open end of the side wall 101, and the first connecting portion 302 is fixedly connected with the second connecting portion 402 and the open end of the side wall 101. Exemplarily, the open end of the side wall 101, the first connecting portion 302 and the second connecting portion 402 are roll-woundly connected. By roll-woundly connecting the second end of the side wall 101, the first connecting portion 302 and the second connecting portion 402, the connection strength between the second end of the side wall 101 and the first connecting portion 302 of the first adapter piece 300 can be ensured, and it is not necessary to be fixed by laser welding, so as to avoid burning the battery can 100 or the cover plate 400 by laser welding, and meanwhile the stability of the secondary battery can be improved.

[0060] Continuing to refer to Figure 2 , the side wall 101 comprises a third connecting portion 1011, and the first connecting portion 302, the second connecting portion 402 and the third connecting portion 1011 are fixedly connected. Exemplarily, the first connecting portion 302 and the second connecting portion 402 are roll-woundly fixed to the outside of the third connecting portion 1011 of the side wall 101. Specifically, the first connecting portion 302 of the first adapter piece 300 is wrapped outside the third connecting portion 1011, and the second connecting portion 402 of the cover plate 400 is wrapped outside the first connecting portion 302. In this way, the first adapter piece 300, the cover plate 400 and the side wall 101 of the battery can 100 can be stably fixedly connected, and the sealing effect of the connection portion is good, so as to prevent the electrolyte from leaking.

[0061] Continuing to refer to Figure 2 , a sealing layer 700 is arranged between the second connecting portion 402 and the first connecting portion 302, so as to ensure the sealing property of the connection between the cover plate 400 and the first adapter piece 300 and the third connecting portion 1011 of the side wall 101, and prevent the electrolyte from leaking. Optionally, the sealing layer 700 is sealing glue. Exemplarily, the sealing glue can be coated on the surface of the second connecting portion 402 facing the first connecting portion 302, or the sealing glue can be coated on the surface of the first connecting portion 302 facing the second connecting portion 402, or the sealing glue can be coated on the opposite surfaces of the first connecting portion 302 and the second connecting portion 402, so as to ensure the sealing between the first connecting portion 302 and the second connecting portion 402. In other embodiments, the sealing layer 700 can also be a sealing ring. Exemplarily, a sealing ring can be sleeved outside the second connecting portion 402 of the cover plate 400, and then the sealing ring is extruded during the roll-wound sealing process, so as to realize the sealing connection between the second connecting portion 402 of the cover plate 400 and the first connecting portion 302 of the first adapter piece 300.

[0062] In an embodiment, the first connecting part 302 is in direct contact with the third connecting part 1011 of the side wall 101, and the two are kept in electrical connection to realize the positive and negative same polarity of the secondary battery. In order to facilitate the contact connection between the first connecting part 302 and the third connecting part 1011, Figure 2 In an embodiment, the side wall 101 further comprises a step surface 1012 and a main body part 1013, the step surface 1012 is connected between the third connecting part 1011 and the main body part 1013, and the step surface 1012 extends towards the axis direction of the battery can 100. In this way, the third connecting part 1011 is close to the first connecting part 302, thereby ensuring the stability of the electrical connection between the two, and facilitating the winding and fixing of the first connecting part 302, the second connecting part 402 and the third connecting part 1011. Exemplarily, the step surface 1012 is an annular surface, and the difference between the diameter and the outer diameter of the annular surface is 0.6mm-6mm. In this way, the movement of the battery cell in the shell can be prevented. If the value of the step surface 1012 is too small, it cannot play a supporting effect, and if the value is too large, it is difficult to manufacture. In addition, since the electrolyte is injected at the opening end, a too small opening will affect the efficiency of the battery liquid injection. Of course, in other embodiments, an insulating sealing layer can be arranged between the first connecting part 302 and the third connecting part 1011 of the side wall 101 to realize the insulating connection between the first adapter piece 300 and the battery can 100.

[0063] Preferably, the first connecting part 302 is at least partially perpendicular to the adapter part 301, the third connecting part 1011 of the side wall 101 is at least partially perpendicular to the step surface 1012, and the part of the first connecting part 302 perpendicular to the adapter part 301 is in close contact with the part of the third connecting part 1011 of the side wall 101 perpendicular to the step surface 1012. In this way, the contact area between the first connecting part 302 and the third connecting part 1011 of the side wall 101 can be ensured to be large enough, and the first connecting part 302 and the third connecting part 1011 of the side wall 101 will not be separated due to the distortion force generated during the crimping and sealing, thereby ensuring the stability of the secondary battery. Further, the second connecting part 402 is at least partially perpendicular to the cover part 401, and the part of the second connecting part 402 perpendicular to the cover part 401 is sealingly connected with the part of the first connecting part 302 perpendicular to the adapter part 301, so as to ensure the sealing property of the cover plate 400 and avoid electrolyte leakage.

[0064] Figure 3 A structure schematic diagram of a second secondary battery provided by the application is shown. Figure 4 A structure schematic diagram of a second secondary battery provided by the application is shown. Figure 3 An enlarged view of B in the above figure is shown. Figure 4 The application is further illustrated by the following examples. Figure 3As shown, the secondary battery comprises a battery can 100, an electric core 200, a first adapter piece 300, a cover plate 400, a second adapter piece 500 and a pole 600. The battery can 100 comprises a side wall 101 and an end wall 102, the side wall 101 is provided with an opening at one end, and the end wall 102 is connected to the other end of the side wall 101; the electric core 200 is arranged in the battery can 100 from the opening end of the side wall 101; and the cover plate 400 is sealingly connected to the opening end of the side wall 101. The first adapter piece 300 is arranged in the battery can 100, and a part of the first adapter piece 300 is connected to a first tab of the electric core 200, so as to ensure that the first adapter piece 300 is electrically connected to the first tab of the electric core 200, and a part of the first adapter piece 300 is connected to the opening end of the side wall 101. The second adapter piece 500 is arranged in the battery can 100, and the second adapter piece 500 is connected to a second tab of the electric core 200, so as to ensure that the second adapter piece 500 is electrically connected to the second tab of the electric core 200. The pole 600 is fixedly connected to the end wall 102 of the battery can 100, and a part of the pole 600 extends into the battery can 100 and is connected to the second adapter piece 500. Exemplarily, the pole 600 is fixed to the end wall 102 by riveting. The second secondary battery is basically the same as the first secondary battery in structure, and details are not repeated here. The main difference between the two is that:

[0065] Referring to Figure 4 , the first connecting part 302 is wound outside the second connecting part 402, and a sealing layer 700 is arranged between the first connecting part 302 and the inner and outer parts of the second connecting part 402. Further, the third connecting part 1011 of the side wall 101 is wound outside the first connecting part 302, and the third connecting part 1011 directly contacts the first connecting part 302 and maintains electrical connection. In this way, the contact area of the adapter part 301 of the first adapter piece 300 and the third connecting part 1011 of the side wall 101 of the battery can 100 can be increased, the overcurrent capacity between the first adapter piece 300 and the side wall 101 of the battery can 100 can be improved, the stability of electrical connection between the two can be ensured, and the stability of electrical connection of the secondary battery can be ensured. It should be noted that, Figure 3 and Figure 4 are shown, the winding part of the first connecting part 302 and the third connecting part 1011 is vertically bent and wound, however, in practice, the winding part of the third connecting part 1011, the first connecting part 302 and the sealing layer 700 is generally circularly bent and wound when being fixed to the second connecting part 402, Figure 3 and Figure 4 The structures shown in the figures cannot be regarded as a limitation on the secondary battery structure provided by the present application.

[0066] The present invention also provides a first method for manufacturing a secondary battery, used to process the aforementioned first type of secondary battery. The components required for this manufacturing method include: a battery canister 100 to be assembled, a first adapter plate 300 to be assembled, a cover plate 400 to be assembled, terminals 600 to be assembled, a battery cell 200 to be assembled, and a second adapter plate 500 to be assembled. The secondary battery manufacturing method includes: assembling the terminals 600, the second adapter plate 500, and the battery cell 200; assembling the first adapter plate; assembling the cover plate; narrowing the battery canister opening; and sealing the edges.

[0067] It is worth noting that the assembly of the pole 600, the second adapter plate 500, and the battery cell 200 can use common assembly processes in existing technologies, which will not be elaborated here.

[0068] Figure 5 A schematic diagram of the structure of the first adapter piece 300 to be assembled according to the present invention is shown. Figure 5 As shown, the first adapter piece 300 to be assembled includes an adapter portion 301 and a first rolled edge 303. The first rolled edge 303 protrudes from the periphery of the adapter portion 301, and forms a first connecting portion 302 after assembly and sealing. Exemplarily, the first rolled edge 303 is perpendicular to the adapter portion 301. Figure 5 Combination Figure 2 It can be seen that the main structural difference between the first adapter piece 300 to be assembled and the first adapter piece 300 after assembly and sealing is as follows: before assembly and sealing, the first rolled edge 303 is perpendicular to the adapter part 301; after assembly and sealing, the first rolled edge 303 is wound and fixed to the third connecting part 1011 of the side wall 101. The structure of the adapter part 301 of the first adapter piece 300 does not change significantly before and after assembly and sealing. Therefore, for ease of understanding, the first adapter piece 300 to be assembled and the first adapter piece 300 in the finished secondary battery after assembly and sealing use the same designation, and the adapter part 301 in the first adapter piece 300 also uses the same designation, while the first rolled edge 303 and the first connecting part 302 use different designations.

[0069] Figure 6 A schematic diagram of the structure of the cover plate 400 to be assembled according to the present invention is shown. For example... Figure 6 As shown, the cover plate 400 to be assembled includes a sealing portion 401 and a second rolled edge 403. The second rolled edge 403 protrudes from the periphery of the sealing portion 401, and forms a second connecting portion 402 after the sealing is assembled. Exemplarily, the second connecting portion 402 is perpendicular to the sealing portion 401. Figure 6 Combination Figure 2It can be seen that the main difference between the to-be-assembled cover plate 400 and the cover plate 400 after assembly and sealing in structure is that before assembly and sealing, the second edge 403 is perpendicular to the cover portion 401 as a whole, and after assembly and sealing, the second edge 403 is wrapped and fixed on the first connecting portion 302; and before and after assembly and sealing, the structure of the cover portion 401 of the cover plate 400 changes little. Therefore, in order to facilitate understanding, the to-be-assembled cover plate 400 and the cover plate 400 in the finished product secondary battery after assembly and sealing adopt the same reference numerals, and the cover portion 401 in the cover plate 400 also adopts the same reference numerals, while the second edge 403 and the second connecting portion 402 adopt different reference numerals.

[0070] Figure 7 A structure schematic diagram of the first adapter sheet 300 after being assembled into the battery can 100 is shown. As shown in Figure 7 The to-be-assembled first adapter sheet 300 is arranged on the battery cell 200 in the battery can 100, and the adapter portion 301 is fixedly connected with the first tab of the battery cell 200. Figure 8 A structure schematic diagram of the cover plate 400 after being assembled into the battery can 100 is shown. As shown in Figure 8 The to-be-assembled cover plate 400 is arranged on the to-be-assembled first adapter sheet 300. Figure 9 A structure schematic diagram of the battery can after necking is shown. As shown in Figure 9 The opening end of the side wall 101 of the battery can 100 is necked to form a stepped surface 1012, so that the third connecting portion 1011 of the side wall 101 is attached to the first edge 303. Figure 10 A structure schematic diagram after edge sealing is shown. As shown in Figure 10 The third connecting portion 1011 of the side wall 101 of the battery can 100, the first edge 303 and the second edge 403 are wrapped and connected, so that the third connecting portion 1011 of the side wall 101 of the battery can 100, the first edge 303 and the second edge 403 are fixedly connected to form a finished product secondary battery. The manufacturing method ensures that the first adapter sheet 300 is tightly attached to the side wall 101 of the battery can 100 to realize electrical connection through the battery can necking process, and realizes the tight connection of the cover plate 400, the first adapter sheet 300 and the side wall 101 of the battery can 100 through the edge sealing process. Compared with the problems such as poor welding caused by the welding and fixing of the first adapter sheet 300 and the side wall 101 in the prior art, the process steps of the manufacturing method are simpler, and the electrical connection effect is better.

[0071] It is worth noting that during the necking process of the battery can 100, the second end of the battery can 100 is necked, which facilitates the electrolyte injection operation, so that the battery can 100 and the injection tooling can better cooperate, thereby improving the injection efficiency.

[0072] Preferably, in the cover plate assembling step, a sealing layer 700 is arranged between the second crimping edge 403 and the first crimping edge 303, which can ensure the sealing of the connecting part of the cover plate 400 and the first adapter piece 300, and avoid the leakage of electrolyte.

[0073] For example, in the cover plate assembling step, the sealing layer 700 can be arranged by applying sealing glue on the surface of the second crimping edge 403 facing the first crimping edge 303, or by applying sealing glue on the surface of the first crimping edge 303 facing the second crimping edge 403, or by applying sealing glue on both surfaces of the first crimping edge 303 and the second crimping edge 403, or by arranging a sealing ring between the second crimping edge 403 and the first crimping edge 303, which can be sleeved on the second crimping edge 403. Of course, the sealing layer 700 can also be arranged by other methods such as pasting sealing material on the first crimping edge 303, which will not be illustrated one by one here.

[0074] The application also provides a second secondary battery manufacturing method for processing the above-mentioned second secondary battery, which comprises the steps of assembling the pole 600, the second adapter piece 500 and the battery cell 200, assembling the first adapter piece, assembling the cover plate, necking the battery can, and crimping and sealing. The secondary battery manufacturing method is similar to the process steps of the above-mentioned secondary battery manufacturing method, which will not be repeated here, and the main difference lies in the different crimping and sealing step. Specifically as follows:

[0075] In the crimping and sealing step of the first manufacturing method, the first crimping edge 303 and the second crimping edge 403 are crimped and fixed together, and the first crimping edge 303 is crimped and fixed outside the third connecting part 1011 of the side wall 101 to form the first connecting part 302 as shown in Figure 2 , and the second crimping edge 403 is crimped and fixed outside the first connecting part 302 to form the second connecting part 402 as shown in Figure 2 ; while in the crimping and sealing step of the second manufacturing method, the opening end of the side wall 101 and the first crimping edge 303 are crimped and fixed together, and the first crimping edge 303 is crimped and fixed outside the second crimping edge 403 to form the first connecting part 302 as shown in Figure 4 , and the opening end of the side wall 101 is crimped and fixed outside the first connecting part 302 to form the third connecting part 1011.

[0076] The embodiment also provides an electronic device comprising the above-mentioned secondary battery. The electronic device has more stable performance by applying the above-mentioned secondary battery.

[0077] Optionally, the electronic device can be a power battery or an energy storage device or other electronic products, which will not be illustrated one by one here.

[0078] It is noted that, in this description and in the following claims, the terms "some embodiments," "other embodiments," etc. do not necessarily refer to the same embodiments, although they can. The starting point of the embodiments will now be described in further detail, with reference to the attached drawings, in which:

[0079] The above descriptions are only the preferred embodiment of the present application and the applied technical principles. It is understood by those skilled in the art that the present application is not limited to the specific embodiments described herein, and various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of the present application. Therefore, although the present application has been described in detail through the above embodiments, the present application is not limited to the above embodiments, and can include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the scope of the appended claims.

Claims

1. A secondary battery, characterized in that, include: A battery canister, including a sidewall, one end of which includes an opening; The battery cell is disposed inside the battery canister; The first adapter piece is disposed at the open end of the side wall. The first adapter piece includes an adapter portion and a first connecting portion. The first connecting portion is disposed around the adapter portion and is electrically connected to the battery cell. A cover plate covers the opening, the adapter is disposed between the cover plate and the battery cell, and the first connecting part is at least partially disposed between the cover plate and the side wall, and the first connecting part is fixedly connected to both the cover plate and the side wall. The cover plate includes a sealing part and a second connecting part. The second connecting part is disposed on the periphery of the sealing part, and the first connecting part is fixedly connected to the second connecting part and the side wall. The sidewall includes a third connecting portion, which is located at the open end of the sidewall. The first connecting portion is fixedly connected to both the second connecting portion and the third connecting portion. The first connecting portion and the second connecting portion are wound and fixed to the outside of the third connecting portion; or The first connecting portion and the third connecting portion are wound and fixed to the outside of the second connecting portion.

2. The secondary battery according to claim 1, characterized in that, The sidewall also includes a stepped surface and a main body, the stepped surface being connected between the third connecting part and the main body, and the stepped surface extending in a direction perpendicular to the axial direction of the battery can.

3. The secondary battery according to claim 2, characterized in that, The stepped surface is an annular surface, and the difference between the inner diameter and the outer diameter of the annular surface is 0.6mm-6mm.

4. The secondary battery according to claim 1, characterized in that, A sealing layer is provided between the second connecting part and the first connecting part.

5. The secondary battery according to claim 4, characterized in that, The sealing layer is a sealant or a sealing ring.

6. The secondary battery according to any one of claims 1-5, characterized in that, The first connecting part is electrically connected to the side wall.

7. A method for manufacturing a secondary battery, characterized in that, For processing a secondary battery as described in any one of claims 1-6, the first adapter piece to be assembled includes an adapter portion and a first rolled edge, wherein the first rolled edge protrudes from the periphery of the adapter portion; The secondary battery manufacturing method includes: First adapter assembly: The first adapter to be assembled is placed on the battery cell inside the battery can, and the adapter is electrically connected to the battery cell; Cover plate assembly: Place the cover plate to be assembled onto the first adapter piece to be assembled; Edge rolling and sealing: The open end of the side wall of the battery can, the first rolled edge, and the cover plate are rolled and connected together so that the first rolled edge is fixedly connected to both the cover plate and the open end of the side wall.

8. The method for manufacturing a secondary battery according to claim 7, characterized in that, In the cover plate assembly step, the cover plate to be assembled includes a sealing part and a second rolled edge, the second rolled edge protruding from the periphery of the sealing part; a sealing layer is provided between the second rolled edge and the first rolled edge.

9. The method for manufacturing a secondary battery according to claim 8, characterized in that, In the cover plate assembly step, the sealing layer is set by applying sealant to the surface of the second rolled edge facing the first rolled edge. or Apply sealant to the surface of the first rolled edge facing the second rolled edge; or Sealant is applied to both the first and second rolled edges on their opposing surfaces; or A sealing ring is provided between the second rolled edge and the first rolled edge.

10. The method for manufacturing a secondary battery according to claim 7, characterized in that, After the cover plate is assembled and before the edge sealing is performed, the secondary battery manufacturing method further includes: Battery can narrowing: The open end of the side wall of the battery can is narrowed so that the open end of the side wall fits against the first rolled edge.

11. An electronic device, characterized in that, Includes the secondary battery as described in any one of claims 1-6.

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