Cylindrical battery collector plate and assembly method thereof

Abstract

The invention discloses a cylindrical battery collector plate, and relates to the technical field of cylindrical batteries, the cylindrical battery collector plate comprises a cross-shaped metal sheet and a boss used for being connected with a pole, one end face of the metal sheet is provided with a plurality of pits, the other end face of the metal sheet is provided with convex hulls corresponding to the pits, the pits are used for being coated with conductive adhesive, and the convex hulls are used for being coated with conductive adhesive. The metal sheet is provided with a reinforcing rib at the convex hull; the metal sheet and the boss are subjected to laser welding; original collector plate welding and pole column welding are replaced with the conductive adhesive, collector plate bending and welding heat influence are not likely to be caused, assembly is more convenient and faster under the condition that the electrifying capacity is guaranteed, the cross-shaped metal sheets serve as the collector plates, the area of the collector plates can be reduced, the electrolyte infiltration effect of the roll core is improved, and the service life of the roll core is prolonged. Through the mutual cooperation of the conductive adhesive and the metal sheet, the overcurrent rate is improved, and the performance of the roll core is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field related to cylindrical battery collector plates, and in particular to a cylindrical battery collector plate and an assembly method thereof. Background Art

[0002] The existing cylindrical battery is composed of a winding core formed by winding positive and negative electrode separators, positive and negative electrode covers, a shell and an electrolyte package. The whole is cylindrical, and the shell can be made of aluminum or steel.

[0003] There are currently two types of covers for cylindrical cells, one is a soft connection cover and the other is a hard connection cover. The soft connection cover uses a connecting piece with a collector plate, and the collector plate is welded to the winding core pole ear by laser welding, resistance welding or ultrasonic welding. The hard connection cover removes the connecting piece and directly welds the pole column collector plate and the winding core pole ear together, saving space.

[0004] However, existing cylindrical cells have the following problems:

[0005] 1) After the welding of the soft connection collector is completed, the connecting piece needs to be bent. If the bending angle is wrong, it will lead to poor assembly concentricity, affecting the subsequent welding of the cover and the shell, and even making it impossible to close the cover

[0006] 2) The welding position of the hard-connected collector plate is often close to the electrode piece of the core diaphragm. It is necessary to pay attention to the heat effect of the welding process that shrinks the diaphragm and causes the positive and negative electrodes of the core to be short-circuited. Summary of the invention

[0007] Purpose of the invention: The purpose of the present invention is to provide a cylindrical battery collector and an assembly method thereof to solve the problem of connecting the collector and the battery cell in the cylindrical battery.

[0008] Technical solution:

[0009] A cylindrical battery collector plate comprises a cross-shaped metal sheet and a boss for connecting a pole, wherein one end face of the metal sheet is provided with a plurality of pits, and the other end face of the metal sheet is provided with convex bumps corresponding to the pits, wherein the pits are used for coating conductive adhesive, and the metal sheet is provided with reinforcing ribs at the convex bumps; the metal sheet and the boss are laser welded.

[0010] Preferably, the metal sheet and the boss are both made of metal aluminum, metal copper, metal nickel, or copper-plated nickel.

[0011] Preferably, the conductive glue includes conductive carbon-doped adhesive, conductive silver glue, and conductive copper glue.

[0012] Preferably, the pit has a depth greater than 0.5 mm, and the pit surface is corrugated or rough.

[0013] Preferably, the center of the boss is a corrugated or rough surface.

[0014] Preferably, there are four pits, and the pit array is arranged on the metal sheet.

[0015] Preferably, the boss is located at the center of the metal sheet, and the convex bump and the reinforcing rib are located on the peripheral side of the boss.

[0016] A method for assembling a cylindrical battery collector disk, comprising the cylindrical battery collector disk, a winding core and a cover plate as described above, and the steps are:

[0017] Applying conductive glue to the concave part of the current collecting plate;

[0018] Attaching a current collecting plate coated with conductive adhesive to the pole ear of the winding core;

[0019] Squeeze the convex bumps on the surface of the collector plate to fully combine and adhere the conductive glue to the tab;

[0020] Apply conductive glue to the boss;

[0021] Adhere the cover plate pole to the glued area;

[0022] Squeeze the surface of the cover to ensure that the conductive glue is fully bonded and adhered to the pole.

[0023] Beneficial effects: By replacing the original collector plate welding and pole welding with conductive adhesive, it is not easy to cause the collector plate to bend or be affected by welding heat. While ensuring the power-carrying capacity, the assembly is more convenient and quicker. By using a cross metal sheet as the collector plate, the collector plate area can be reduced and the electrolyte infiltration effect of the winding core can be improved. The mutual cooperation of the conductive adhesive and the metal sheet can improve the flow rate and ensure the performance of the winding core. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the front structure of the metal sheet of the present invention;

[0025] Figure 2 It is a schematic diagram of the back structure of the metal sheet of the present invention;

[0026] Figure 3 It is a schematic diagram of the side structure of the metal sheet of the present invention;

[0027] Figure 4 It is an assembly schematic diagram of the present invention.

[0028] Figure numerals: 11, metal sheet; 12, pit; 13, convex bump; 14, reinforcing rib; 15, boss; 21, winding core; 22, cover plate. DETAILED DESCRIPTION

[0029] In order to make the technical solution of the present invention clearer, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] Example 1

[0031] refer to Figures 1 to 3 A cylindrical battery collector disk includes a cross-shaped metal sheet 11 and a boss 15 for connecting a pole. The metal sheet 11 and a winding core 21 are connected by conductive adhesive, and the boss 15 and the pole are connected by conductive adhesive. The metal sheet 11 is the main body of the collector disk, and the boss 15 and the metal sheet 11 are laser welded together to ensure the connection strength.

[0032] The metal sheet 11 is cross-shaped and smaller in area than a conventional disc-shaped current collector. When the metal sheet 11 is connected to the winding core 21 through conductive glue, less conductive glue is used and only glued in some areas, which does not hinder the infiltration of the electrolyte.

[0033] The metal sheet 11 and the boss 15 can be made of conductive metal sheets such as metal aluminum, metal copper, metal nickel, or copper-plated nickel. The thickness of the metal sheet 11 serving as the main body of the current collecting plate in the present application can be further increased than the thickness of an ordinary welded current collecting plate. An overly thick current collecting plate will affect the number of laser welding penetration layers. In the present application, no welding is required. The metal sheet 11 and the winding core 21 are connected by conductive glue, and the thickness of the current collecting plate can be increased to increase the flow area.

[0034] Among them, the conductive glue uses conductive carbon mixed with adhesives, conductive silver glue, conductive copper glue and other conductive glues with strong adhesion and low resistivity. The mixture of conductive carbon and conductive metal needs to ensure sufficiently low resistivity conditions, and the adhesive material used must ensure the structural tensile strength and corrosion resistance of the connection, so that the conductivity of the assembled battery cell is close to the performance of the core after laser welding.

[0035] Furthermore, in order to facilitate the connection between the metal sheet 11 and the winding core, a pit 12 is provided on one end face of the metal sheet 11, and a corresponding bulge 13 is formed on the other end face of the metal sheet 11 due to the pit 12. The pit 12 is in contact with the winding core 21, and the pit 12 is used to coat the conductive adhesive. The upper end face of the winding core 21 is provided with a pole ear for connection. When the metal sheet 11 and the winding core 21 are connected, the pole ear will extend into the pit 12, and the pole ear will contact the conductive adhesive.

[0036] There are four pits 12 corresponding to the four corners of the cross metal sheet 11 . The array arrangement of the pits 12 facilitates the connection between the metal sheet 11 and the winding core 21 .

[0037] The depth of the pit 12 is greater than 0.5 mm. The pit 12 can ensure the amount of conductive glue applied to ensure the conductive connection between the winding core 21 and the metal sheet 11. The depth of the pit 11 can be changed according to the actual glue coating demand. If the demand is large, the pit depth can be increased, and if the demand is small, the pit depth can be reduced. The surface of the pit 11 can be corrugated or roughened to increase the contact area between the conductive glue and the metal sheet, thereby increasing the adhesion area of ​​the conductive glue, and increasing the bonding force and flow area between the conductive glue and the metal sheet.

[0038] The convex bump 13 can be squeezed and deformed. During assembly, by pressing the convex bump 13, the conductive adhesive in the concave pit 12 can be fully contacted with the winding core and diffused, so that the contact part of the metal sheet 11 and the winding core 21 can be fully penetrated by the conductive adhesive, thereby increasing the close adhesion between the conductive adhesive and the winding core. Alternatively, the convex bump 13 can be locally heated to shape the conductive adhesive, which can also achieve the adhesion effect between the conductive adhesive and the winding core.

[0039] Among them, the metal sheet 11 is provided with a reinforcing rib 14 at the bulge 13, and the position of the reinforcing rib 14 corresponds to the position of the bulge 13. The circular collector plate with a cross-shaped collector plate wall is more easily deformed. The use of the reinforcing rib 14 can improve the strength of the collector plate, i.e., the metal sheet 11, ensure the flatness of the metal sheet 11, and facilitate assembly, clamping, and installation positioning.

[0040] The boss 15 and the metal sheet 11 are connected by laser welding. The boss 15 is installed at the center of the metal sheet 11 to facilitate installation and connection. The center of the boss 15 can be treated with corrugations and rough surfaces. The center of the boss 15 is used to coat conductive glue and connect with the pole. The corrugated or rough surface treatment can increase the adhesion area and flow area of ​​the conductive glue and the pole.

[0041] After being coated with glue, the boss 15 is used to adhere the metal pole of the cover plate 22. The lower end surface of the cover plate 22 is provided with a pole for connection. When the whole is assembled and installed, the pole of the cover plate 22 and the boss 15 are connected to avoid the heat shrinkage of the diaphragm or plastic parts caused by the heat effect during the laser welding of the pole.

[0042] like Figure 4 As shown, the assembly method of the cylindrical battery collector plate in the present application is mainly used for the combined connection between the cylindrical battery collector plate, the winding core 21 and the cover plate 22. First, the conductive glue is coated on the pit 12 of the metal sheet 11, and the metal sheet 11 coated with the conductive glue is attached to the pole ear of the winding core 21. The convex bump 13 on the surface of the metal sheet 11 is squeezed to make the conductive glue and the pole ear fully combined and adhered. Conductive glue is coated on the boss 15, and the pole of the cover plate 22 is adhered to the glue-coated place, and the surface of the cover plate 22 is squeezed to make the conductive glue and the pole fully combined and adhered.

[0043] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A cylindrical battery collector plate, characterized in that: The invention comprises a cross-shaped metal sheet (11) and a boss (15) for connecting a pole, wherein one end surface of the metal sheet (11) is provided with a plurality of pits (12), and the other end surface of the metal sheet (11) is provided with convex hulls (13) corresponding to the pits (12), and the pits (12) are used for coating conductive adhesive, and the metal sheet (11) is provided with reinforcing ribs (14) at the convex hulls (13); the metal sheet (11) and the boss (15) are laser welded.

2. A cylindrical battery collector according to claim 1, characterized in that: The metal sheet (11) and the boss (15) are both made of metal aluminum, metal copper, metal nickel, or copper-plated nickel.

3. A cylindrical battery collector according to claim 1, characterized in that: The conductive glue includes conductive carbon-doped adhesive, conductive silver glue, and conductive copper glue.

4. A cylindrical battery collector according to claim 1, characterized in that: The depth of the pit (12) is greater than 0.5 mm, and the surface of the pit (12) is a corrugated or rough surface.

5. A cylindrical battery collector according to claim 1, characterized in that: The center of the boss (15) is a corrugated or rough surface.

6. A cylindrical battery collector according to claim 1, characterized in that: There are four recesses (12), and an array of the recesses (12) is arranged on the metal sheet (11).

7. A cylindrical battery collector according to claim 6, characterized in that: The boss (15) is located at the center of the metal sheet (11), and the convex bulge (13) and the reinforcing rib (14) are located on the peripheral side of the boss (15).

8. A method for assembling a cylindrical battery collector plate, characterized in that: The method comprises a cylindrical battery current collector, a winding core (21) and a cover plate (22) as described in claims 1 to 7, and the steps are as follows: S1: Applying conductive glue to the concave pit (12) of the current collecting plate; S2: attaching a current collecting plate coated with a conductive adhesive to the pole ear of the winding core (21); S3: squeezing the convex bump (13) on the surface of the current collecting plate so that the conductive adhesive is fully combined and adhered to the electrode ear; S4: Applying conductive glue on the boss (15); S5: Adhere the cover plate (22) and the pole to the glued area; S6: Press the surface of the cover plate (22) to allow the conductive adhesive to fully bond and adhere to the pole.

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