CN215644570U - Positive electrode single-lug current collector and lithium battery - Google Patents

Abstract

The utility model discloses a positive electrode single-lug current collecting piece and a lithium battery, which comprise a current collecting disc, wherein the middle part of the current collecting disc is provided with a through hole penetrating through the current collecting disc, one surface of the current collecting disc is provided with a plurality of point connection positions, adjacent point connection positions are arranged at intervals, the point connection positions are arranged around the through hole, the point connection positions are positioned on one surface of the current collecting disc and are concave, one surface of the current collecting disc is provided with a folding edge perpendicular to the current collecting disc, and the edge of the current collecting disc is also provided with a lug extending towards one side. Compared with the prior art, beneficial effect lies in: the current collecting disc is provided with the lug which is connected with the shell, so that heat inside the battery cell is transferred to the shell through the lug and electrolyte, and the emission of heat is accelerated.

Description

Positive electrode single-lug current collector and lithium battery

[ technical field ] A method for producing a semiconductor device

The utility model relates to the technical field of lithium batteries, in particular to a positive electrode unipolar lug current collecting piece and a lithium battery using the same.

[ background of the utility model ]

With the exhaustion of non-renewable resources, the new energy industry is rapidly developed, and various new energy battery cells are produced under the strong support of national policies. With the development of new energy automobiles, endurance and battery pack life become important concerns, and great requirements are also placed on single battery cells. For the current high-rate cylindrical lithium battery, in high-temperature weather and during high-rate discharge, the temperature of the working environment of the battery cell is higher due to the fact that the battery cell generates heat through ohmic internal resistance and chemical internal resistance and accumulates inside the battery cell, and the capacity of the battery cell is attenuated due to high temperature, so that the service life cycle of the battery cell is shortened. And the heat dissipation capacity of the battery core is small because of the small heat dissipation area, and when the battery discharges with large multiplying power, the heat generated by the battery cannot be dissipated in time, so that the active substances in the battery core are decomposed to generate heat, and the battery is seriously ignited and exploded.

In view of the above, it is desirable to provide a positive electrode unipolar collector plate and a lithium battery using the same to overcome the above-mentioned drawbacks.

[ Utility model ] content

The utility model aims to provide a positive electrode single-pole lug current collector, which aims to reduce the heat generated by a lithium battery in the discharging process, increase the heat conduction area, accelerate the heat dissipation, avoid the battery from being ignited and exploded and improve the reliability and the safety of the battery.

In order to achieve the purpose, the utility model provides a positive electrode single-pole lug current collecting piece which is characterized by comprising a current collecting disc, wherein a through hole penetrating through the current collecting disc is formed in the middle of the current collecting disc, a plurality of point connection positions are arranged on one surface of the current collecting disc, the adjacent point connection positions are arranged at intervals, the point connection positions are arranged around the through hole, the point connection positions are arranged on one surface of the current collecting disc and are concave, a folding edge perpendicular to the current collecting disc is arranged on one surface of the current collecting disc, and a lug extending out towards one side is further arranged on the edge of the current collecting disc.

In a preferred embodiment, the water collector is characterized by further comprising a winding core, one end of the winding core is connected with the current collecting disc, a winding core hole is formed in the winding core, and the winding core hole corresponds to and is matched with the through hole.

In a preferred embodiment, one end of the tab close to the current collecting disc is bent towards one side of the current collecting disc, which is far away from the folded edge, and one end of the tab far away from the current collecting disc is bent towards the direction far away from the current collecting disc.

In a preferred embodiment, the pole collecting device is characterized by further comprising a shell, one end of the shell is connected with the current collecting disc, a pole connecting sheet is arranged inside the other end of the shell, and the pole connecting sheet is connected with one end, far away from the current collecting disc, of the pole lug.

In a preferred embodiment, the collecting plate is made of metal.

In a preferred embodiment, the metal material is aluminum.

In a preferred embodiment, the outer surface of the collecting plate is further provided with a coating.

Another aspect of the present invention provides a lithium battery including the positive electrode unipolar collector sheet according to any one of the above embodiments.

Compared with the prior art, the positive electrode single-pole ear collector provided by the utility model has the beneficial effects that: the current collecting disc is provided with the plurality of point connection positions, the point connection positions are connected with the foil area on the winding core, the battery core is divided into the plurality of small battery cores, so that the internal resistance of the battery core is reduced, the heat conduction area is increased, the pole lug is arranged on the current collecting disc and is connected with the shell, the heat inside the battery core is transferred to the shell through the pole lug and the electrolyte, the heat emission is accelerated, the structure is simple, the manufacturing process is simple, and the cost is low.

[ description of the drawings ]

FIG. 1 is a schematic structural view of a current collecting plate according to the present invention;

fig. 2 is a schematic view of the assembly of the current collector and core and housing of the present invention.

In the figure:

10. a current collecting plate; 101. a through hole; 102. point connection; 103. folding edges; 104. a tab; 11. a winding core; 111. a core winding hole; 12. a housing; 121. and (6) connecting the pole with the connecting sheet.

[ detailed description ] embodiments

In order to make the objects, technical solutions and advantageous effects of the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and the detailed description. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the utility model, are intended for purposes of illustration only and are not intended to limit the scope of the utility model.

The utility model provides a positive electrode unipolar lug current collector 100 which is mainly used for reducing heat generated by a lithium battery in a discharging process, increasing the heat conduction area, accelerating the heat dissipation, avoiding the battery from being ignited and exploded, and improving the reliability and the safety of the battery.

In an embodiment of the present invention, as shown in fig. 1 and 2, the positive electrode unipolar tab collector 100 includes: the middle of the current collecting disc 10 is provided with a through hole 101 penetrating through the current collecting disc 10, one surface of the current collecting disc 10 is provided with a plurality of point joint positions 102, adjacent point joint positions 102 are arranged at intervals, the point joint positions 102 surround the through hole 101, the surface of the back of the current collecting disc in a point joint mode is concave, one surface of the current collecting disc 10 is provided with a folding edge 103 perpendicular to the current collecting disc 10, and the edge of the current collecting disc 10 is further provided with a lug 104 extending horizontally towards one side.

Furthermore, the whole of the current collecting disc 10 is made of metal materials, such as aluminum, the aluminum has high electrical conductivity, the heat generation of current is reduced, the thermal conductivity coefficient and the oxidation resistance are high, the heat can be well conducted out, the shaping can be completed through a stamping process, the structure is simple, the difficulty of process production control is reduced, the mass production can be realized under the condition that the equipment requirement is not very high, the production efficiency is improved, the current collecting disc 10 is circular, the center of the current collecting disc 10 is provided with a through hole 101 penetrating through the current collecting disc 10, the through hole 101 is used for enabling electrolyte to flow into the winding core 11 through the through hole 101, the current collecting disc 10 is provided with a plurality of inwards concave spot-joint positions 102 for improving the welding area of the welding material and the spot-joint positions 102 so as to meet the requirement of welding strength when the current collecting disc 10 is welded with the welding material, the welding stability is enhanced, and the arc edge on one side of the current collecting disc 10 is also provided with a folded edge 103 perpendicular to the current collecting disc 10, the flange 103 is used for connecting with the outside, a tab 104 extending to one side is arranged on the edge of the current collecting plate 10, and the tab 104 is used for connecting the current collecting plate 10 with the outside to form a positive terminal.

In this embodiment, the positive electrode unipolar collector plate 100 further includes a winding core 11, one end of the winding core 11 is connected to the collector plate 10, a winding core hole 111 is formed in the winding core 11, and the winding core hole 111 corresponds to and is matched with the through hole 101.

Further, roll up core 11 and current collector 10 looks adaptation, the inside of rolling up core 11 is equipped with one and matches and the core hole 111 that corresponds with through-hole 101, roll up when core 11 places on current collector 10, roll up core hole 111 and insert and locate in through-hole 101, thereby make electrolyte permeate through this through-hole 101 and roll up in core 11, the foil material (not seen in the picture) in rolling up core 11 then welds with point joint 102, the tip edge of rolling up core 11 then passes through laser welding with the inner wall of the hem 103 of current collector 10 and together, make current collector 10 and roll up core 11 become an organic whole, the realization is divided into a plurality of little electric cores with the electric core and is parallelly connected, and then reduce the internal resistance of electric core, thermal conduction area has also been increased simultaneously.

In this embodiment, one end of the tab 104 close to the current collecting disk 10 is bent toward the side of the current collecting disk 10 away from the folding edge 103, and one end of the tab 104 far from the current collecting disk 10 is bent toward the direction far from the current collecting disk 10.

Further, one end of the tab 104 close to the current collecting disc 10 is bent towards a side of the current collecting disc 10 away from the folding edge 103, one end of the tab 104 away from the current collecting disc 10 is bent towards a direction away from the current collecting disc 10, so that the tab 104 is in an S shape.

It should be noted that, a layer of isolating layer (not shown) is coated on the outer wall of the collecting tray 10 connected to the winding core 11 by high temperature glue, so as to avoid short circuit caused by the contact between the casing 12 and the collecting tray 10.

Further, since the electrolyte is corrosive, in order to prevent the current collecting plate 10 from being corroded, a plating layer (not shown) is provided on the outer surface of the current collecting plate 10, and the plating layer is plated with nickel by an electroplating solution, thereby improving the corrosion resistance of the current collecting plate 10.

Another aspect of the present invention provides a lithium battery including the positive electrode unipolar collector sheet according to any one of the above embodiments.

In summary, the positive electrode single-pole lug current collecting plate provided by the utility model divides the battery cell into a plurality of small battery cells by arranging a plurality of point connection positions on the current collecting plate, and the point connection positions are connected with the foil material area on the winding core, so that the internal resistance of the battery cell is reduced, and meanwhile, the heat conduction area is increased.

The utility model is not limited solely to that described in the specification and embodiments, and additional advantages and modifications will readily occur to those skilled in the art, so that the utility model is not limited to the specific details, representative apparatus, and illustrative examples shown and described herein, without departing from the spirit and scope of the general concept as defined by the appended claims and their equivalents.

Claims (8)

1. The utility model provides an anodal monopole ear current collector, its characterized in that, includes the current collection dish, the middle part of current collection dish is equipped with and runs through the through-hole of current collection dish, be equipped with a plurality of point positions of connecing in the one side of current collection dish, it is adjacent the interval sets up between the point position, the point position of connecing centers on the through-hole sets up, the point connects and is located the one side of current collection dish is concave form, the one side of current collection dish is equipped with the perpendicular to the hem of current collection dish, still be equipped with the utmost point ear that extends to one side on the edge of current collection dish.

2. The positive monopolar ear current collector plate according to claim 1, further comprising a winding core, wherein one end of the winding core is connected with the current collector plate, a winding core hole is formed in the winding core, and the winding core hole corresponds to and is matched with the through hole.

3. The positive monopolar and ear current collector plate according to claim 1, wherein the end of said tab adjacent to said current collector plate is bent toward the side of said current collector plate facing away from said folded edge, and the end of said tab remote from said current collector plate is bent toward the direction away from said current collector plate.

4. The positive monopolar ear current collecting plate according to claim 3, further comprising a housing, wherein one end of the housing is connected with the current collecting plate, a pole connecting plate is arranged inside the other end of the housing, and the pole connecting plate is connected with one end of the pole ear far away from the current collecting plate.

5. The positive monopolar ear current collector plate of claim 1, wherein said current collector plate is made of a metal material.

6. The positive monopolar lug current collector of claim 5, wherein said metal material is aluminum.

7. The positive monopolar ear current collector plate of claim 1, further comprising a coating on the outer surface of said current collector plate.

8. A lithium battery comprising the positive electrode unipolar collector sheet according to any one of claims 1 to 7.

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