CN214848698U

CN214848698U - Negative-electrode-end double-tab current collector and lithium battery

Info

Publication number: CN214848698U
Application number: CN202120329274.0U
Authority: CN
Inventors: 吴传官; 曾严; 陈浩峰; 唐罗
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 bipolar ear current collector of negative pole end 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 a subtend on the edge of current collection dish and keep away from the utmost point ear that the current collection dish direction extends, it is a pair of utmost point ear sets up relatively. 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 double-tab current collector and lithium battery

[ technical field ] A method for producing a semiconductor device

The utility model relates to a lithium battery technology field, in particular to negative pole end both ends utmost point ear current collector piece and use this negative pole end both ends utmost point ear current collector piece's lithium cell.

[ 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 bipolar tab current collector and a lithium battery using the same to overcome the above-mentioned drawbacks.

[ Utility model ] content

The utility model aims at providing a two utmost point ear current collectors of negative pole end 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 bipolar lug 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 a subtend on the edge of current collector dish and keep away from the utmost point ear that the current collector dish direction extends, it is a pair of utmost point ear sets up relatively.

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 each pair of the tabs 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 each pair of the tabs far away from the current collecting disc is bent towards the direction far away from the current collecting disc.

In a preferred embodiment, the device 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 pair of pole lugs.

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, which comprises any one of the above embodiments, wherein the negative electrode terminal and the current collector are provided with two tabs.

Compared with the prior art, the utility model provides a negative pole end bipolar lug current collector, 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 perspective view of the present invention;

fig. 2 is a schematic plan view 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 bipolar lug current collector 100 of negative pole end, mainly used reduce the heat that the lithium cell produced at the discharge 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. 1-2, the negative-end bipolar 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 one subtend on the edge of collecting disc 10 and keep away from the utmost point ear 104 that the collecting disc 10 direction extends, it is a pair of utmost point ear 104 sets up relatively.

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 pair of tabs 104 extending outwards are arranged on the edge of the current collecting disc 10, the tabs 104 are respectively arranged on two sides of the current collecting disc and are oppositely arranged, and the tabs 104 are used for connecting the current collecting disc 10 with the outside to form a negative end.

In this embodiment, the negative-end bipolar tab collector sheet 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 fits 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 ends of the pair of tabs 104 close to the current collecting disk 10 are respectively bent toward a surface of the current collecting disk 10 away from the folding edge 103, and one ends of the tabs 104 far from the current collecting disk 10 are respectively bent toward a direction far from the current collecting disk 10.

Furthermore, one end of each tab 104 close to the current collecting disk 10 is bent towards the side of the current collecting disk 10 away from the folding edge 103, and one end of each tab 104 far from the current collecting disk 10 is bent towards the direction far from the current collecting disk 10, so that the tab 104 is S-shaped, in the embodiment of the utility model, the utility model also comprises a shell 12, the casing 12 is a cylinder with one open end, the open end is connected with the outer wall of the current collecting disc 10, the pole connecting sheet 121 is arranged inside the other end of the casing 12, the pole connecting pieces 121 are respectively connected with one ends of the pole lugs 104 far away from the current collecting disc 10, so that the shell 12 and the current collecting pieces are connected together to form a negative end, when the battery cell works at a high multiplying power, the heat in the battery cell can be timely transferred to the end surface of the battery cell, heat is transferred to the shell through the pole lugs 104 and the electrolyte and is rapidly dissipated, so that the phenomenon that the temperature inside the battery cell is too high and the battery cell is ignited and exploded is avoided.

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 single-pole lug 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 a pair of utmost point ear on the current collector dish, a pair of utmost point ear is connected with the shell, make the inside heat of electric core pass through utmost point ear and electrolyte transmission to casing, can fine dispersion current density, reduce utmost point ear heat production, and accelerateing thermal giving off, moreover, the steam generator is simple in structure, the manufacturing process is simple, and 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 bipolar tab 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 of connecing on 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 a subtend on the edge of current collection dish and keep away from the utmost point ear that the current collection dish direction extends, it is a pair of utmost point ear sets up relatively.

2. The negative-end double-tab current collecting plate according to claim 1, further comprising a winding core, wherein one end of the winding core is connected with the current collecting disc, and a winding core hole is formed in the winding core and corresponds to and is matched with the through hole.

3. The negative-end double-tab current collecting plate according to claim 1, wherein one end of each of the pair of tabs close to the current collecting plate is bent toward the surface of the current collecting plate away from the folded edge, and one end of each of the pair of tabs away from the current collecting plate is bent toward the direction away from the current collecting plate.

4. The negative-end bipolar tab current collector according to claim 3, further comprising a housing, wherein one end of the housing is connected to the current collecting plate, and a terminal connecting piece is disposed inside the other end of the housing and connected to one end of the pair of tabs away from the current collecting plate.

5. The negative-end double-tab current collector plate according to claim 1, wherein the current collector plate is made of a metal material.

6. The negative-end double-tab current collector as claimed in claim 5, wherein the metal material is copper.

7. The negative-end double-tab current collector plate according to claim 1, wherein a plating layer is further provided on the outer surface of the current collecting disk.

8. A lithium battery comprising the negative-end double-tab current collector of any one of claims 1 to 7.