CN210607464U

CN210607464U - Current collector of capacity type battery

Info

Publication number: CN210607464U
Application number: CN201920934007.9U
Authority: CN
Inventors: 杨辉; 朱志刚; 李东飞; 周军; 钟徐俊; 代江华
Original assignee: WUHAN FUTE TECHNOLOGY CO LTD
Current assignee: WUHAN FUTE TECHNOLOGY CO LTD
Priority date: 2019-06-20
Filing date: 2019-06-20
Publication date: 2020-05-22
Anticipated expiration: 2029-06-20

Abstract

The utility model discloses a mass flow body of volumetric battery, a serial communication port, the mass flow body includes annular main part, be equipped with the opening that the axial runs through in the main part, set up a plurality of through-holes in the main part, the main part upper end is equipped with the utmost point ear of bar and the spacer that the level stretches out outwards. The utility model discloses the utilization has the open-ended main part and makes the mass flow body very easily install, and the mass flow body is packed into after cliping the back power slightly and making its external diameter diminish during the assembly, and the mass flow body can not cause the damage to anodal carbocycle inner wall because the material has certain elasticity, and the internal resistance of reduction battery that can be fine simultaneously ensures that the battery uses later stage internal resistance to amplify less.

Description

Current collector of capacity type battery

Technical Field

The utility model relates to a battery production specifically indicates a mass flow body of capacity type battery.

Background

The existing current collectors are cut into small pieces by using steel mesh or nickel mesh, and then spot-welded to the positive electrode core rod, and the current collectors are generally strip-shaped pieces along the length direction of the core rod, as shown in fig. 1. The structure of the existing lithium secondary battery is as follows: the shell inner wall of lithium sub-battery is hugged closely has annular lithium area, and anodal granule material (for acetylene black more than 90 wt%) compresses tightly and packs in lithium area cavity, and anodal granule material top, bottom, outer wall all are equipped with the diaphragm, have electrolyte in the anodal granule material, when current mass flow body is applied to this lithium sub-battery structure, have following defect:

(1) the area of the net surface of the current collector contacting the positive electrode is relatively small, and the distribution area of the current collector after the positive electrode particles are inserted is limited, so that the current collecting effect is poor, particularly, if the net surface of the current collecting net is exactly in a horizontal state when the battery is in a flat lying state, the upper current is difficult to collect, and the discharge performance of the battery is less ideal;

(2) the core bar and the current collecting net are inserted into the positive electrode granules to damage the positive electrode granules, the ball material under the core bar is very hardened due to the insertion stress of the core bar, the current collecting net is formed by stamping sheet materials, net spines are inevitably formed on the edge of the current collecting net, and the net spines can also damage the spherical structure of the carbon granules when the current collecting net is inserted into the positive electrode;

(3) because the core rod and the current collecting net need to break through the diaphragm (the mask) at the top of the positive electrode particles, the peripheral edge of the mask is easy to tilt, so that the internal positive electrode particles are separated, the carbon positive electrode particles directly contact with the negative electrode lithium belt after flowing due to the liquidity of the electrolyte, and the internal short circuit of the battery is caused, so that the output capacity is reduced or the battery is consumed in advance during actual use.

Therefore, it is required to develop a current collector for a capacity type battery which has a simple structure, a good current collecting effect, and convenience in installation without damaging a positive electrode.

Disclosure of Invention

The utility model aims at solving the defects of the prior art and providing a current collector of a capacity type battery which has simple structure, good current collecting effect, convenient installation and no damage to the anode.

The technical scheme of the utility model is that: the utility model provides a mass flow body of volumetric battery, its characterized in that, the mass flow body includes annular main part, be equipped with the opening that the axial runs through in the main part, set up a plurality of through-holes in the main part, the main part upper end is equipped with the utmost point ear of bar and the spacer that the level stretches out outwards.

Preferably, a plurality of the positioning pieces are arranged at intervals along the circumferential direction of the main body, the positioning pieces are arranged at intervals along the circumferential direction, and a process hole is formed at the joint of each positioning piece and the main body.

Preferably, the tab comprises a connecting strip connected with the main body and a soldering lug positioned at the upper end of the connecting strip, and the horizontal width of the soldering lug is greater than that of the connecting strip.

Preferably, the edges of two opposite sides of the opening are bent towards the inside of the main body to form a first flanging and a second flanging, and the first flanging, the second flanging and the main body are in circular arc transition.

Furthermore, the main part is equipped with first hypotenuse and second hypotenuse that extends each other and keep away from to the bottom down in the opening both sides, first hypotenuse and second hypotenuse correspond with first turn-ups and second turn-ups homonymy respectively.

Preferably, the root of the tab radially corresponds to the opening at the upper end of the main body.

Preferably, the through holes are arranged in a row at intervals in the axial direction on the main body, and a plurality of rows of through holes are arranged in an array at intervals in the circumferential direction.

Preferably, the current collector is integrally formed.

The utility model has the advantages that:

1. the annular current collector is extremely easy to install, the positive pole carbocycle of tube-shape is pressed into to anodal granule material pressure equipment, and the current collector is packed into in the anodal carbocycle after being cliied the atress and making the external diameter diminish during the assembly, and the current collector can not cause the damage to anodal carbocycle inner wall because the material has certain elasticity, and the current collector outer wall is laminated with anodal good after kick-backing, reduces the internal resistance simultaneously, ensures that the battery uses later stage internal resistance to increase amplitude less.

2. With the later consumption of negative lithium, the positive carbon ring is expanded outwards, and the annular current collector is in full contact with the positive carbon ring all the time from the beginning to the end of the use of the battery due to the tension generated by elasticity, so that the increase amplitude of the internal resistance of the battery is far smaller than that of the traditional current collecting net, and the output capacity of the battery is more.

3. Annular mass flow body is because big with anodal carbocycle contact surface, and the contact is tighter, consequently to anodal carbocycle, carbon positive pole utilization ratio also can be higher, and the anodal specific capacity of carbon promptly can be higher, consequently can use a smaller amount of anodal carbon granule material when assembling electric core, the space of saving from this can pour into more electrolyte into, more electrolyte can improve the output capacity of battery, improves the uniformity of product.

4. Because the hollow structure of the current collector, more free electrolyte can be stored in the middle space region of the battery, and more free electrolyte can ensure that the battery can be better supplemented into the carbon anode in the later use stage, so that the stable electrochemical reaction can be continuously maintained, and the higher capacity of the output of the battery can be ensured.

5. The facial mask can be set to the annular according to anodal carbocycle shape, and the diameter size is unanimous, and the locating piece of mass flow body can cooperate to fix the facial mask.

Drawings

FIG. 1 is a schematic view of a current collector structure in the prior art

FIG. 2 is the schematic diagram of the current collector structure of the present invention

FIG. 3 is a top view of the current collector of the present invention

Figure 4 is a perspective view of the current collector of the present invention

FIG. 5 is a schematic view of the connection between the current collector and the upper cover of the present invention

Wherein: 1-main body 2-opening 3-through hole 4-pole ear 5-positioning piece 6-first flanging 7-second flanging 8-first bevel edge 9-second bevel edge 10-current collector 11-upper cover 12-core rod 41-connecting bar 42-welding piece 51-fabrication hole.

Detailed Description

The present invention will be described in further detail with reference to the following drawings and specific embodiments.

Fig. 1 is a schematic diagram of a current collector structure in the prior art, which has been described in detail in the background art and will not be described herein again.

As shown in fig. 2-4, the utility model provides a current collector of capacity type battery, current collector 10 include the main part 1 of cylinder, are equipped with the opening 2 that the axial runs through on the main part 1, set up a plurality of through-holes 3 and main part 1 upper end axial extension on the main part 1 and form utmost point ear 4. The upper end of the main body 1 extends axially to form positioning pieces 5, the positioning pieces 5 are circumferentially arranged at intervals, and process holes 51 are formed at the joints of the positioning pieces 5 and the main body 1. In this embodiment, the axial direction is upward and downward in fig. 2.

The tab 4 includes a connection bar 41 connected with the body 1 and a tab 42 at an upper end of the connection bar 41, the tab 42 having a horizontal width greater than that of the connection bar 41.

The opposite two side edges of the opening 2 are bent towards the inside of the main body 1 to form a first flanging 6 and a second flanging 7, and the first flanging 6 and the second flanging 7 are in circular arc transition with the main body 1. The main part 1 is equipped with the first hypotenuse 8 and the second hypotenuse 9 that extend each other and keep away from to the bottom down in opening 2 both sides, and first hypotenuse 8 and second hypotenuse 9 correspond with first turn-ups 6 and second turn-ups 7 homonymy respectively.

The root of the tab 4 is corresponding to the opening 2 at the upper end of the main body 1 in the radial direction. The tab 4 is positioned between two adjacent positioning sheets 5. The through holes 3 are arranged in rows at intervals in the axial direction on the main body 1, and a plurality of rows of the through holes 3 are arranged in an array at intervals in the circumferential direction. The current collector 10 is formed by integral punch forming, i.e. punching into a sheet shape and then curling, and is made of 304, 306 stainless steel or nickel with certain hardness and elasticity.

The utility model discloses an assembly process does:

pressing the anode particles into a cylindrical anode carbon ring, arranging a surface film at the top of the anode carbon ring, arranging an annular first surface film with an inner diameter and an outer diameter corresponding to those of the anode carbon ring, and putting the current collector 10 into the anode carbon ring by passing through the first surface film: the outer diameter of the current collector 10 is slightly larger than the inner diameter of the anode carbon ring in a normal state, the current collector acts on the first flanging 6 and the second flanging 7 through a clamp during assembly, the outer diameter of the main body 1 is extruded and reduced and then the main body 1 is installed, and the outer wall of the main body 1 is in good contact with the anode after rebounding due to certain elasticity of materials of the main body 1. First turn-ups 6 and second turn-ups 7 have avoided opening 2 edge to produce the burr and have led to the fact the scraping to anodal carbocycle inner wall, and opening 2 both sides bottom is scraped to anodal carbocycle inner wall when first hypotenuse 8 and second hypotenuse 9 effect are for preventing to pack into, and the carbocycle structure that will have moulded destroys or scrapes its carbon particle. The root of the lug 4 is at the radial corresponding position of the opening 2, so that the lug 4 can be far away from the opening 2 as far as possible, and the interference to the clamp installation is avoided.

As shown in fig. 5, the positioning sheet 5 of the rear current collector 10 is pressed down to fix the first surface film, the second surface film is arranged above the first surface film, the second surface film is circular (the outer diameter is slightly larger than the outer diameter of the positive carbon ring), the second surface film directly penetrates through the tab 4 downwards and is pressed and covered above the positioning sheet 5, the first surface film avoids the leakage of the particles on the top surface of the positive carbon ring, the second surface film prevents the particles with the inner wall of the positive carbon ring from leaking from the through hole 3 of the current collector, and the particles flow onto the surface film after flowing into the inside of the current collector cylinder and contact with the negative lithium (the positive carbon ring, the first surface film and the second surface film are not drawn.

Finally, the tab 42 of the tab 4 is welded to the core rod 12 on the upper cover 11 for conducting the current of the current collector 10 to the core rod. The soldering lug 42 has a horizontal width larger than that of the connecting bar 41, so that spot welding with the core rod is facilitated.

Because be provided with the negative pole lithium piece between the limit membrane of anodal carbocycle outer wall and the casing, along with the later stage negative pole lithium consumption back, cause anodal carbocycle external diameter also outwards to enlarge, the mass flow body 10 because the tension that elasticity produced can begin to use the battery to the end stage, the mass flow body 10 is abundant with anodal carbocycle contact all the time, therefore the range that the internal resistance of battery increases will be far less than current mass flow body, consequently its output capacity can be more.

Because the annular hollow structure of the current collector 10, the battery can store more free electrolyte in the middle space region, and the more free electrolyte can also ensure that the output capacity of the battery is higher, so that the inner wall of the anode carbon ring cannot be damaged, the internal resistance can be well reduced, and the increase of the internal resistance of the battery in the later use period is small.

Claims

1. The utility model provides a mass flow body of volumetric battery, its characterized in that, mass flow body (10) include annular main part (1), be equipped with opening (2) that the axial runs through on main part (1), set up a plurality of through-holes (3) on main part (1), main part (1) upper end is equipped with utmost point ear (4) of bar and spacer (5) that the level stretches out outwards.

2. The current collector of the capacity battery as claimed in claim 1, wherein a plurality of the positioning sheets (5) are arranged at intervals along the circumference of the main body (1), and a process hole (51) is arranged at the joint of each positioning sheet (5) and the main body (1).

3. The current collector of a capacity type battery according to claim 1, wherein the tab (4) comprises a connection bar (41) connected to the body (1) and a tab (42) at an upper end of the connection bar (41), the tab (42) having a horizontal width greater than that of the connection bar (41).

4. The current collector of the capacity type battery as claimed in claim 1, wherein the opposite side edges of the opening (2) are bent inwards the main body (1) to form a first flanging (6) and a second flanging (7), and the first flanging (6) and the second flanging (7) are in arc transition with the main body (1).

5. The current collector of a capacity battery according to claim 4, characterized in that the body (1) is provided, on both sides of the opening (2), with a first bevel (8) and a second bevel (9) extending downwards away from each other to the bottom, the first bevel (8) and the second bevel (9) corresponding to the first flanging (6) and the second flanging (7) on the same side, respectively.

6. The current collector of a capacity battery according to claim 1, characterized in that the root of the tab (4) corresponds radially to the opening (2) at the upper end of the body (1).

7. The current collector of a capacity battery according to claim 1, characterized in that the through holes (3) are arranged in rows axially spaced on the body (1), and in that a plurality of rows of through holes (3) are arranged circumferentially spaced in an array.

8. The current collector of the capacity battery according to claim 1, characterized in that the current collector (10) is integrally formed.