CN213425035U

CN213425035U - Tab-free battery

Info

Publication number: CN213425035U
Application number: CN202022879493.4U
Authority: CN
Inventors: 潘青海
Original assignee: Doxter Tianjin New Energy Technology Co ltd
Current assignee: Doxter Tianjin New Energy Technology Co ltd
Priority date: 2020-12-05
Filing date: 2020-12-05
Publication date: 2021-06-11
Anticipated expiration: 2030-12-05

Abstract

The utility model provides an electrodeless ear battery, including casing, positive plate, negative pole piece and diaphragm, the casing includes the main casing body and battery cover, the battery cover is including setting up sealing washer, upper portion and lower part, the sealing washer sets up in the casing upper end, and the both ends tip of upper portion and lower part all with sealing washer fixed connection. The utility model discloses the battery cover needs to have CID (Current Interrupt Device) function, and when the battery became invalid, inside produced a lot of gases, during pressure increase, the solder joint of welding the battery cover can break off and drop, and the upset makes the inside circuit break of battery, plays the guard action promptly. And meanwhile, the liquid injection hole is formed, and by utilizing the rivet principle, when riveting, the rivet can rivet the white current collector of the anode or the cathode at the same end with the battery shell, so that the connection strength of the battery core and the shell is enhanced, and the internal resistance of the battery is reduced.

Description

Tab-free battery

Technical Field

The utility model relates to and the battery field, concretely relates to electrodeless ear battery.

Background

With the rapid increase of the demand of the current market for batteries, the requirements for the batteries are higher and higher, especially the requirements for the power batteries are continuously reduced, the manufacturing cost of the power batteries is improved, the quick charging capability and the high-rate discharging capability of the batteries are improved, the service life of the power batteries is prolonged, and the like.

The most common design is that the battery is designed to have no electrode lug or all electrode lugs, and the core design concept is that the positive and negative current collectors are directly connected or welded with a cover plate (current collecting disc), and then the cover plate (current collecting disc) is connected with a battery shell, so that the effect of greatly reducing the internal resistance of the battery is achieved. But in the mode, the cover plate (current collecting disc) is additionally connected with the positive and negative electrode current collecting plates, so that the production process steps are increased; meanwhile, the cover plate (current collecting plate) is added to occupy the space inside the battery, so that a part of the battery capacity is lost; furthermore, the connection of the cover plate (current collecting plate) and the battery shell has certain connection area limitation, so that the probability of increasing the internal resistance of the battery is increased, and the advantage of no electrode lug is greatly reduced.

Because of the design of 'no pole ear' or 'full pole ear', the positive and negative current collectors and the shell are directly welded with certain technical difficulties and process problems, and a part of the technology is to directly provide a mode without 'cover plate' (current collecting disc), and realize the point contact of the positive and negative current collectors and the shell by adopting a mechanical contact mode or directly connect the positive and negative current collectors and the shell through some conductive bonding materials without welding process. The method has the disadvantages that the risk of untight contact is easily caused in the production and manufacturing process, and the complex use environment of the battery can cause a gap between the positive and negative current collectors and the shell which are in good contact originally in the subsequent use process of the battery due to no welding, so that the internal resistance of the battery is unstable, the service life of the battery is shortened, and the performance of the battery is influenced. If the positive and negative current collectors of the battery are in mechanical contact with the shell, the complete disconnection of the battery conduction cannot be realized when the inside of the battery is out of control, and certain potential safety hazards exist.

In order to solve the above problems, how to ensure the safety of the battery, increase the internal space of the battery, increase the capacity and energy density of the battery, enhance the welding effect, reduce the internal welding resistance of the battery, improve the large current charging and discharging capability of the battery, reduce the production cost of the battery, and optimize the production process steps is the main improvement direction of the problem.

SUMMERY OF THE UTILITY MODEL

The utility model provides an electrodeless ear battery aims at solving prior art and adopts the potential safety hazard that many utmost points ear, full utmost point ear and electrodeless ear structure exist, occupy battery inner space, internal resistance big or unstable, a series of problems such as the complicated difficulty of technology and with high costs about the battery. Simultaneously because the utility model discloses when involving in the preparation anodal mass flow body and battery cover direct weld, because welding energy is too big, electrolyte can not pour into in advance, otherwise can arouse the safety problem, and electrolyte can only pour into again after anodal mass flow body and the welding of battery cover again, and the mouth is annotated in the design of battery cover department to conventional technology, and technology operation degree of difficulty coefficient is bigger like this, and the leakproofness is unstable, for solving these problems simultaneously, still design out with the utility model discloses the scheme of relevant battery cover design, bottom notes liquid mode design.

Realize the technical scheme of the utility model is that:

the utility model provides an electrodeless ear battery, includes casing, positive plate, negative pole piece and diaphragm, the casing includes main casing body and battery cover, the battery cover is including setting up sealing washer, upper portion and lower part, the sealing washer sets up in the casing upper end, and the both ends tip of upper portion and lower part all with sealing washer fixed connection.

Preferably, the main housing (battery case) is cylindrical or square.

Main casing body bottom is equipped with annotates the liquid mouth, and it has electrolyte to annotate the interior injection of liquid mouth, utilizes the sealing member to seal annotating the liquid mouth, including but not limited to rivet, silica gel stopper etc..

Furthermore, when the battery case is finally sealed by using the rivet, the rivet made of metal materials such as copper, nickel, aluminum and the like or alloy materials with better conductivity can be adopted, and by using the rivet principle, the rivet can rivet the pole piece blank current collector at the same end with the battery case together when riveting; thereby the joint strength of electric core and casing has been strengthened and the internal resistance of battery has been reduced.

The battery is characterized in that a positive electrode material area and a positive electrode blank foil are arranged on the positive electrode plate, a negative electrode material area and a negative electrode blank foil are arranged on the negative electrode plate, the diaphragm, the positive electrode plate and the negative electrode plate are sequentially stacked to form a battery cell in a winding or stacking mode, and the negative electrode blank foil is connected with the bottom end of the main shell.

The lower part comprises a straight overturning area, arc-shaped buffer areas are upwards arranged at two ends of the straight overturning area, and fixed ends are arranged at the end parts of the arc-shaped buffer areas.

Furthermore, the connecting shell (battery cover) has a CID (Current Interrupt Device) function, that is, when the battery fails, a large amount of gas is generated inside, and when the pressure is increased, a welding point welded to the lower part (flat overturning area) of the battery cover is overturned after being broken and separated, so that the inside of the battery is broken, and a protection effect is achieved. The design of the battery cover is reasonable, when the battery fails and generates a large amount of gas, the battery cover is ensured to have enough space for turning over and breaking, and meanwhile, enough vent holes can release the gas instantly when the battery is exploded.

The lower end face of the straight overturning area is fixedly connected with the positive blank foil, and the straight overturning area and the central area of the battery cell are arranged in an up-and-down corresponding mode.

Preferably, the exposed positive and negative electrodes of the electrode assembly (cell) may have various structures, including a vertical structure, a spiral winding, a flat-folded structure, a cross structure, and the like.

Preferably, the material-free regions (blank) of the positive plate and the negative plate can be all or part, and the shape can be any shape, including a linear shape, a triangular shape, a rectangular shape, a sawtooth shape, and the like, and the shape can also be combined by one or more than one different shapes.

The battery cell is characterized in that an insulating gasket is further arranged at the upper end of the battery cell, foil holes are formed in the insulating gasket, and the insulating gasket is arranged below the arc-shaped buffer area.

The preparation method of the battery without the pole ear comprises the following steps:

(a) coating active substances on a metal foil according to the process proportion of positive and negative electrodes, and rolling, molding and cutting to obtain a positive plate and a negative plate, wherein the positive plate is provided with a positive electrode material area and a positive electrode blank foil, and the negative plate is provided with a negative electrode material area and a negative electrode blank foil;

(b) the diaphragm, the positive plate and the negative plate are sequentially stacked to form a battery cell in a winding or stacking mode, and the battery cell is arranged in the main shell;

(c) directly contacting the negative blank foil with the bottom of the main shell;

(d) performing a roll groove process on the main shell, and arranging an insulating gasket above the battery core;

(e) directly contacting the blank foil of the positive electrode with the flat overturning area, and mechanically sealing the battery cover on the opening side of the main shell;

(f) arranging a liquid injection port at the bottom of the main shell, injecting electrolyte into the liquid injection port, and pre-sealing the liquid injection port by using a sealing element;

(g) after cleaning the housing, the housing is formed, and after the formation, the sealing member is pulled out, and after the exhaust, the housing is sealed with a rivet.

The utility model has the advantages that: the utility model discloses the battery cover needs to have CID (Current Interrupt Device) function, and when the battery became invalid, inside produced a lot of gases, during pressure increase, the solder joint of welding the battery cover can break off and drop, and the upset makes the inside circuit break of battery, plays the guard action promptly. And meanwhile, the liquid injection hole is formed, and by utilizing the rivet principle, when riveting, the rivet can rivet the white current collector of the anode or the cathode at the same end with the battery shell, so that the connection strength of the battery core and the shell is enhanced, and the internal resistance of the battery is reduced.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic diagram of the structure of the tab-free battery of the present invention.

Fig. 2 is the structural schematic diagram of the battery cell without the tab of the present invention.

Fig. 3 is a schematic view of the bottom of the main housing (battery case) of the present invention.

Fig. 4 is a schematic view of the lower part of the present invention.

Fig. 5 is a schematic side sectional view and a structural view of the middle connection housing (battery cover) of the present invention.

Fig. 6 is the schematic diagram of the utility model after the plate is disposed to the electric core collection without electrode ear.

Fig. 7 is a schematic diagram of positive and negative electrode plates of the tab-less battery of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without any creative effort belong to the protection scope of the present invention.

As shown in fig. 1, the electrodeless ear battery comprises a casing, a positive plate 13-1, a negative plate 13-3 and a diaphragm 13-2, wherein the casing comprises a main casing body 11-1 and a connecting casing (battery cover) mechanically sealed at the top opening of the main casing body, the battery cover comprises a sealing ring 12-2 (insulating part), an upper part 12-1 (metal part) and a lower part 12-3 (metal part), the sealing ring 12-2 is arranged at the upper end of the casing, and the end parts of the two ends of the upper part 12-1 and the lower part 12-3 are fixedly connected with the sealing ring 12-2.

Preferably, as shown in fig. 3, the bottom of the main housing 11-1 is provided with a liquid injection port 11-2, the liquid injection port 11-2 is injected with electrolyte, and the liquid injection port 11-2 is sealed by a sealing member 11-3.

As shown in fig. 2, the positive plate 13-1 is provided with a positive material area 13-12 and a positive blank foil 13-11, and the negative plate 13-3 is provided with a negative material area 13-32 and a negative blank foil 13-31, wherein the positive blank foil 13-11 and the negative blank foil 13-31 are non-material areas (blank), the separator 13-2, the positive plate 13-1 and the negative plate 13-3 are sequentially stacked and then form an electric core 13 by winding or stacking, the negative blank foil 13-31 is connected with the bottom end of the main housing 11-1, and then welding is performed to electrically connect the positive and negative plates with the housing. The edges of the positive blank foil 13-11 and the negative blank foil 13-31 both exceed the separator 13-2.

As shown in FIG. 4, the lower portion 12-3 includes a flat turning region 12-31, the two ends of the flat turning region 12-31 are upwardly provided with arc-shaped buffer regions 12-32, and the ends of the arc-shaped buffer regions 12-32 are provided with fixed ends 12-33. The lower end face of the straight overturning area 12-31 is fixedly connected (welded) with the positive blank foil 13-11, and the straight overturning area 12-31 and the central area of the battery cell 13 are arranged in an up-and-down corresponding mode.

As shown in fig. 5c, an insulating spacer 14 is further disposed at the upper end of the battery cell 13, a foil hole 14-1 is disposed on the insulating spacer 14, and the insulating spacer 14 is disposed below the arc buffer area 12-32. And an insulating gasket (insulating gasket 14) is additionally arranged between the main shell (battery shell) and the roller groove in order to ensure that the battery shell does not contact with the exposed white of the anode.

Example 1

The steps for making a tab-less cell are as follows, and are described in detail in connection with the figures:

1. coating active substances on the metal foil in other areas except the edges of the two sides of the metal foil to form a material area and a material-free area (blank), wherein the material-free area (blank) is generally only arranged on one side, and then rolling, forming and cutting the material-free area into an electrode slice;

2. the positive plate adopts the structure 7d in fig. 7, the positive plate is left blank by the length of 2/3 pole pieces from the first section of the winding core, and the negative plate adopts the structure 7a in fig. 7;

3. forming an electrode assembly (electric core) by winding a porous insulating film (diaphragm) and positive and negative plates, and respectively arranging one ends of a positive electrode material-free area and a negative electrode material-free area (blank) at the outer sides of two long sides of the porous insulating film, wherein the blank (blank) is exposed at the edge of the porous insulating film; see FIG. 2

4. Cutting the exposed margins (material-free areas) of the positive and negative electrodes to make the table surfaces of the positive and negative electrode foils smoother;

5. preparing a cylindrical main shell (battery shell), and placing a battery cell in the battery shell, wherein the negative end of the battery cell is placed towards the bottom of the battery shell;

6. after the negative electrode exposed white is directly contacted with the bottom of the main shell (battery shell), welding is carried out in a laser welding mode, and welding firmness is guaranteed;

7. an insulating backing ring 14 is additionally arranged above the positive end of the battery cell, and a positive blank foil 13-11 penetrates through a foil hole 14-1;

8. then, performing roller grooving on the battery case, namely mechanically compressing the battery case to form an arc-shaped groove, limiting the battery core and the insulating gasket in the bottom area of the groove, and placing the battery cover on the upper part of the battery case to be limited in the upper area of the groove;

9. the structure of the battery cover is shown in fig. 5, wherein the sealing ring of the battery cover is selected from fig. 5b-2, and the upper part is selected from fig. 5 c-1.

9. Directly contacting the exposed anode white with a battery cover, and welding in a laser welding mode to ensure welding firmness;

10. sealing, mechanically sealing the battery cover on the opening side of the battery case;

11. injecting electrolyte into the position of the bottom of the outer shell where the hole (injection port) is reserved, and pre-sealing the hole (injection port) by using a silicon rubber plug;

12. cleaning the shell and then carrying out chemical treatment;

13. and pulling out the silica gel plug at the hole at the bottom of the outer shell after formation, and sealing by using a rivet after exhausting.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An electrode-free ear battery comprises a shell, a positive plate (13-1), a negative plate (13-3) and a diaphragm (13-2), wherein the shell comprises a main shell (11-1) and a battery cover, and is characterized in that: the battery cover comprises a sealing ring (12-2), an upper part (12-1) and a lower part (12-3), wherein the sealing ring (12-2) is arranged at the upper end of the shell, and the end parts of the two ends of the upper part (12-1) and the lower part (12-3) are fixedly connected with the sealing ring (12-2).

2. The electrodeless ear cell as defined in claim 1, wherein: the bottom of the main shell (11-1) is provided with a liquid injection port (11-2), electrolyte is injected into the liquid injection port (11-2), and the liquid injection port (11-2) is sealed by a sealing element (11-3).

3. Electrodeless ear cell as claimed in claim 1 or 2, characterized in that: the battery is characterized in that a positive electrode material area (13-12) and a positive electrode blank foil (13-11) are arranged on the positive electrode plate (13-1), a negative electrode material area (13-32) and a negative electrode blank foil (13-31) are arranged on the negative electrode plate (13-3), the diaphragm (13-2), the positive electrode plate (13-1) and the negative electrode plate (13-3) are sequentially stacked and then form a battery cell (13) in a winding or stacking mode, and the negative electrode blank foil (13-31) is connected with the bottom end of the main casing body (11-1).

4. The tab-less battery of claim 3, wherein: the lower part (12-3) comprises a straight overturning area (12-31), arc-shaped buffer areas (12-32) are arranged at two ends of the straight overturning area (12-31) upwards, and fixed ends (12-33) are arranged at the end parts of the arc-shaped buffer areas (12-32).

5. The tab-less battery of claim 4, wherein: the lower end faces of the straight overturning areas (12-31) are fixedly connected with the positive blank foils (13-11), and the straight overturning areas (12-31) are arranged corresponding to the central area of the battery cell (13) up and down.

6. The tab-less battery of claim 3, wherein: the battery cell is characterized in that an insulating gasket (14) is further arranged at the upper end of the battery cell (13), foil holes (14-1) are formed in the insulating gasket (14), and the insulating gasket (14) is arranged below the arc-shaped buffer areas (12-32).