CN214848703U

CN214848703U - Negative electrode end single-pole lug current collector and lithium battery

Info

Publication number: CN214848703U
Application number: CN202120329306.7U
Authority: CN
Inventors: 吴传官; 梁向龙; 陈浩峰; 胡万军
Original assignee: Dongguan Wotaitong New Energy Co ltd
Current assignee: Dongguan Langtaitong Technology Co.,Ltd.
Priority date: 2021-02-04
Filing date: 2021-02-04
Publication date: 2021-11-23
Anticipated expiration: 2031-02-04

Abstract

The utility model discloses a negative pole end single-pole ear current collector and lithium cell, including 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, 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. Compared with the prior art, beneficial effect lies in: 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

Negative electrode end single-pole lug current collector and lithium battery

[ technical field ] A method for producing a semiconductor device

The utility model relates to a lithium cell technical field, in particular to negative pole end unipolar ear current collector piece and use lithium cell of this negative pole end unipolar ear current collector piece.

[ background of the invention ]

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 negative-end unipolar tab current collector sheet and a lithium battery using the same to overcome the above-mentioned drawbacks.

[ Utility model ] content

The utility model aims at providing a negative pole end unipolar ear current collector aims at reducing the heat that the lithium cell produced at the discharge process, increases thermal conduction area simultaneously, and thermal giving off with higher speed avoids the battery to catch fire and explode, promotes reliability, the security of battery.

In order to realize above-mentioned purpose, the utility model provides a negative pole end unipolar ear current collector, a serial communication port, including the current collector dish, the middle part of current collector dish is equipped with and runs through the through-hole of current collector dish, be equipped with a plurality of point positions of connecing in the one side of current collector dish, it is adjacent the interval sets up between the position of point, the point position of connecing centers on the through-hole, the one side of current collector dish is equipped with the perpendicular to the hem of current collector dish, still be equipped with the utmost point ear that extends to one side on the edge of current collector dish.

In a preferred embodiment, the water collecting device further comprises a winding core, one end of the winding core is connected with the water 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 bends towards one surface of the current collecting disc, which is far away from the folded edge, and one end of the tab, which is far away from the current collecting disc, bends towards the direction far away from the current collecting disc.

In a preferred embodiment, the pole collector further comprises 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 current collecting plate is made of a metal material.

In a preferred embodiment, the metal material is copper.

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 any one of the above embodiments, the negative electrode terminal unipolar tab current collector.

Compared with the prior art, the utility model provides a negative pole end monopole ear current collector piece, beneficial effect lies in: 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 the current collecting plate of the present invention;

fig. 2 is a schematic structural view of the tab of the present invention;

fig. 3 is the assembly schematic diagram of the current collecting disc, the winding core and the 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 technical effects of the present invention more clearly understood, the present invention is further described in detail with reference to the accompanying drawings and the following detailed description. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration only and not by way of limitation.

The utility model provides a negative pole end unipolar ear current collector 100, mainly used reduce the heat that the lithium cell produced at the discharge in-process, increase thermal conduction area simultaneously, thermal giving off with higher speed avoids the battery to catch fire and explode, promotes reliability, the security of battery.

In an embodiment of the present invention, as shown in fig. 1 to 3, the negative end unipolar tab current collector 100 includes: the collecting disc 10, the middle part of collecting disc 10 is equipped with the through-hole 101 that runs through collecting disc 10, be equipped with a plurality of point positions 102 on the one side of collecting disc 10, it is adjacent the interval sets up between the point position 102, point position 102 centers on through-hole 101, the one side of collecting disc 10 is equipped with the perpendicular to the hem 103 of collecting disc 10, still be equipped with the utmost point ear 104 that extends out to one side level on the edge of collecting disc 10.

Furthermore, the whole of the current collecting disc 10 is made of metal materials, such as copper, the copper has high electrical conductivity, the heat generation of current is reduced, the heat conductivity coefficient is 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 upwards-protruding point-connecting positions 102 for improving the welding area of welding materials and the point-connecting positions 102 so as to meet the requirement of welding strength when the current collecting disc is welded with the welding materials, the welding stability is enhanced, the arc edge on one side of the current collecting disc 10 is also provided with a folding edge 103 perpendicular to the current collecting disc 10, the folded edge 103 is used for connecting with the outside, a tab 104 extending towards 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 negative electrode end.

In this embodiment, the negative-end unipolar tab current collecting plate 100 further includes a winding core 11, one end of the winding core 11 is connected to the current collecting 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, the one end that utmost point ear 104 is close to current collecting disc 10 is buckled towards the one side that current collecting disc 10 deviates from hem 103, the one end that current collecting disc 10 was kept away from to utmost point ear 104 is buckled towards the direction of keeping away from current collecting disc 10, make utmost point ear 104 be "S" type in the embodiment of the utility model, still include shell 12, this shell 12 is one end open-ended cylinder, open-ended one end and current collecting disc 10' S outer wall connection, the inside utmost point post connection piece 121 that is equipped with of the other end of shell 12, this utmost point post connection piece 121 is connected with the one end that utmost point ear 104 kept away from current collecting disc 10, thereby make shell 12 and current collecting piece be connected and form the negative pole end together, the terminal surface of electric core can in time be transmitted to the inside heat of electric core when electric core is in high rate work, through utmost point ear 104, electrolyte transmits the casing fast giving off with the heat, thereby avoid the inside high temperature of electric core, and lead to the explosion of catching a fire.

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.

To sum up, the utility model provides a negative pole end monopole ear current collector is connected with roll up the core on the foil district through setting up a plurality of point joint positions on the current collector dish, falls into a plurality of little electric cores with electric core to reduce the internal resistance of electric core, increase thermal conduction area simultaneously, set up an utmost point ear on the current collector dish, utmost point ear is connected with the shell, makes the inside heat of electric core transmit to the casing through utmost point ear and electrolyte, thermal giving off with higher speed, and simple structure, preparation simple process, it is with low costs.

The invention is not limited solely to that described in the specification and the embodiments, and additional advantages and modifications will readily occur to those skilled in the art, and it is not intended to be 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

1. The utility model provides a negative pole end unipolar ear current collector, its characterized in that, includes the current collection dish, the middle part of current collection dish is equipped with the through-hole that runs through the current collection dish, be equipped with a plurality of point positions on the one side of current collection dish, it is adjacent the interval sets up between the point position, the point position centers on the through-hole, 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 negative-end unipolar collector plate according to claim 1, further comprising a winding core, wherein one end of the winding core is connected with the collector plate, and a winding core hole is formed in the winding core and corresponds to and fits the through hole.

3. The negative-end unipolar current collector according to claim 1, wherein one end of the tab close to the current collector disc is bent toward a surface of the current collector disc facing away from the folded edge, and one end of the tab away from the current collector disc is bent toward a direction away from the current collector disc.

4. The negative-end unipolar current collector according to claim 3, further comprising an outer shell, wherein one end of the outer shell is connected with the current collecting disc, a pole connecting sheet is arranged inside the other end of the outer shell, and the pole connecting sheet is connected with one end of the pole lug, which is far away from the current collecting disc.

5. The negative-end unipolar current collector of claim 1, wherein said current collector disk is made of a metal material.

6. The negative-end unipolar current collector according to claim 5, wherein the metal material is copper.

7. The negative-end unipolar current collector of claim 1, wherein said current collector disk further comprises a coating on an outer surface thereof.

8. A lithium battery comprising the negative-end unipolar current collector as recited in any one of claims 1 to 7.