CN218448066U

CN218448066U - Battery core and nickel-hydrogen battery

Info

Publication number: CN218448066U
Application number: CN202222298644.6U
Authority: CN
Inventors: 陈能志; 刘金锁; 唐彬; 张海波
Original assignee: Shenzhen Highpower Technology Co Ltd
Current assignee: Shenzhen Highpower Technology Co Ltd
Priority date: 2022-08-30
Filing date: 2022-08-30
Publication date: 2023-02-03
Anticipated expiration: 2032-08-30

Abstract

The utility model belongs to the technical field of battery manufacturing, and relates to a battery cell and a nickel-hydrogen battery, wherein the battery cell comprises a positive plate, a negative plate and a diaphragm, wherein the positive plate is provided with a positive active material layer, and the negative plate is provided with a negative active material layer; the number of one of the positive plates and the negative plates is two, the number of the other one of the positive plates and the negative plates is one, and the positive plates and the negative plates are alternately arranged; the diaphragm is arranged between the positive plate and the negative plate and is wound with the positive plate and the negative plate to form the battery cell. The battery core can separate two different active substances, and the problems of mutual interference and mutual influence of the different active substances are avoided, so that the performance of the nickel-metal hydride battery is improved.

Description

Battery core and nickel-hydrogen battery

Technical Field

The utility model relates to a battery manufacturing technical field especially relates to a battery electricity core and nickel-hydrogen battery.

Background

The nickel-hydrogen battery is a green secondary new energy, and is very popular with consumers in the civil market and the electric automobile market due to the advantages of high energy, low density, small environmental pollution, no obvious memory effect and the like. The nickel-hydrogen battery is usually manufactured by winding a positive plate, a negative plate and a diaphragm into a cylindrical winding, then putting the cylindrical winding into a steel shell, and then carrying out processes of liquid injection, welding a positive cap, rolling a groove, sealing and the like.

However, the conventional nickel-metal hydride battery generally only includes a positive plate and a negative plate, and in practical applications, in order to meet multiple performance requirements of high and low temperature, long service life, and high quality and specific capacity, two active materials with different performances are generally mixed uniformly in a certain ratio and then filled into a substrate to form a pole piece. Thus, there is a problem that active materials having different performances interfere with each other, thereby affecting the performance of the battery.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at, it has different performance active material mutual interference to solve current nickel-hydrogen battery, reduces the technical problem of nickel-hydrogen battery performance.

In order to solve the technical problem, an embodiment of the utility model provides a battery electric core has adopted following technical scheme:

the battery cell comprises a positive plate, a negative plate and a diaphragm, wherein the positive plate is provided with a positive active substance layer, and the negative plate is provided with a negative active substance layer;

one of the positive plate and the negative plate is provided with two, the other one is provided with one, and the positive plate and the negative plate are alternately arranged;

the diaphragm is arranged between the positive plate and the negative plate and wound between the positive plate and the negative plate to form the battery cell.

Further, in a preferable scheme of some embodiments, the number of the positive electrode plates is two, the number of the negative electrode plates is one, and the negative electrode plate is disposed between the two positive electrode plates.

Further, in a preferable scheme of some embodiments, the number of the positive electrode plates is one, the number of the negative electrode plates is two, and the positive electrode plate is disposed between the two negative electrode plates.

Further, in a preferable mode of some embodiments, the positive electrode sheet further includes a first substrate, and the positive electrode active material layer is disposed on the first substrate; wherein the first matrix is foamed nickel.

Further, in a preferable aspect of some embodiments, the negative electrode sheet further includes a second substrate on which the negative electrode active material layer is disposed; wherein the second substrate is nickel-plated steel.

Further, in a preferred aspect of some embodiments, the battery cell is cylindrical.

In order to solve the above technical problem, an embodiment of the present invention further provides a nickel-metal hydride battery, which adopts the following technical scheme: the nickel-metal hydride battery includes:

the steel shell comprises a bottom wall and a side wall connected with the bottom wall, and the bottom wall and the side wall jointly enclose an accommodating cavity with an opening;

the battery cap is arranged on the top of the steel shell to close the accommodating cavity;

an electrolyte stored within the containment chamber; and

in the battery cell, the battery cell is soaked in the electrolyte.

Further, in a preferred version of some embodiments, the steel shell is adapted to the shape of the battery cell.

Further, in a preferred aspect of some embodiments, the nickel-metal hydride battery further includes an insulating gasket disposed at a lower end of the battery cell to protect the battery cell.

Further, in a preferable mode of some embodiments, the insulating spacer has a disk-shaped structure.

Compared with the prior art, the embodiment of the utility model provides a battery electricity core and nickel-hydrogen battery mainly have following beneficial effect:

this battery electricity core sets up the negative pole active material layer on the negative plate through setting up anodal active material layer in the positive plate that corresponds, and positive plate and negative plate fill different active material separately promptly for two kinds of different active material separation avoid appearing different active material mutual interference problem of influencing each other, thereby improve nickel-hydrogen battery's performance.

Drawings

In order to illustrate the solution of the present invention more clearly, the drawings needed for describing the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts. Wherein:

fig. 1 is a schematic perspective view of a battery cell according to an embodiment of the present invention;

fig. 2 is a schematic cross-sectional view of a battery cell according to an embodiment of the present invention, wherein there are two positive electrode plates and one negative electrode plate;

fig. 3 is a schematic cross-sectional view of a battery cell according to an embodiment of the present invention, wherein there are one positive electrode tab and two negative electrode tabs;

fig. 4 is a schematic cross-sectional view of a nickel-metal hydride battery according to an embodiment of the present invention.

The reference numbers in the drawings are as follows:

1. a nickel-metal hydride battery;

100. a battery cell; 110. a positive plate; 120. a negative plate; 130. a diaphragm;

200. a steel shell; 210. an accommodating chamber;

300. and a battery cap.

Detailed Description

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs; the terms used herein in the specification are for the purpose of describing particular embodiments only and are not intended to limit the present invention, for example, the terms "length," "width," "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or position based on the orientation or position shown in the drawings, for convenience of description only, and should not be construed as limiting the present disclosure.

The terms "including" and "having," and any variations thereof, in the description and claims of this invention and the description of the above figures are intended to cover non-exclusive inclusions; the terms "first," "second," and the like in the description and claims of the present invention or in the above-described drawings are used for distinguishing between different objects and not for describing a particular sequential order. The meaning of "plurality" is two or more unless specifically limited otherwise.

In the description and claims of the present invention and in the above description of the drawings, when an element is referred to as being "fixed" or "mounted" or "disposed" or "connected" to another element, it can be directly or indirectly located on the other element. For example, when an element is referred to as being "connected to" another element, it can be directly or indirectly connected to the other element.

Furthermore, reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the invention. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

An embodiment of the present invention provides a battery cell 100, where the battery cell 100 is used in the manufacturing of a battery, and the battery can be but is not limited to a nickel-metal hydride battery 1.

As shown in fig. 1 to 4, the battery cell 100 includes a positive electrode tab 110, a negative electrode tab 120, and a separator 130. The positive electrode sheet 110 is provided with a positive electrode active material layer (not shown), and the negative electrode sheet 120 is provided with a negative electrode active material layer (not shown). It should be noted that the positive electrode active material layer (not shown) and the negative electrode active material layer (not shown) herein respectively contain active materials with different performances, so as to avoid the problem that the performances of the active materials with different performances are affected by the interference of the active materials with each other, thereby improving the performance of the nickel-hydrogen battery 1.

In addition, in order to further improve the performance of the nickel-hydrogen battery 1, one of the positive electrode tabs 110 and the negative electrode tabs 120 is provided in number of two, and the other is provided in number of one, and the positive electrode tabs 110 and the negative electrode tabs 120 are alternately provided. It can be understood that, when an electrochemical reaction occurs on the battery cell 100, the electrode sheet disposed in the middle (specifically, the positive electrode sheet 110 or the negative electrode sheet 120) and the electrode sheets disposed at both sides may simultaneously perform an electrochemical reaction, that is, the electrode sheet disposed in the middle and the electrode sheets disposed at both sides may simultaneously perform ion conduction, so as to implement dual-path ion conduction of the battery cell 100, thereby improving the performance of the nickel-hydrogen battery 1.

It should be noted that the circulation process of the ions during the charging and discharging process of the nickel-metal hydride battery 1 is clear and obvious to those skilled in the art, and is not described in detail herein.

In addition, in order to prevent the positive electrode sheet 110 and the negative electrode sheet 120 from directly contacting and causing a short circuit, the separator 130 is disposed between the positive electrode sheet 110 and the negative electrode sheet 120, and a user winds the positive electrode sheet 110, the negative electrode sheet 120, and the separator 130 to form the battery cell 100. The separator 130 can isolate the positive electrode tab 110 and the negative electrode tab 120 from each other, and prevent contact therebetween, but ions in the electrolyte can flow through the separator 130.

It should be noted that the diaphragm 130 may be an existing diaphragm 130, or a diaphragm 130 with an innovative structure, which is not limited by the present invention and can be selected by those skilled in the art according to the actual situation.

To sum up, compare prior art, this battery electricity core 100 has following beneficial effect at least: in the battery cell 100, the positive electrode active material layer (not shown) is disposed on the corresponding positive electrode sheet 110, and the negative electrode active material layer (not shown) is disposed on the negative electrode sheet 120, that is, the positive electrode sheet 110 and the negative electrode sheet 120 are respectively filled with different active materials, so that two different active materials are separated, the problem of mutual interference and mutual influence of different active materials is avoided, and the performance of the nickel-hydrogen battery 1 is improved.

In order to make the technical solution of the present invention better understood, the technical solution of the embodiment of the present invention will be clearly and completely described below with reference to fig. 1 to 4.

Embodiment one of the battery cell 100 of the present invention

In the present embodiment, as shown in fig. 1, 2 and 4, the number of positive electrode tabs 110 is two, the number of negative electrode tabs 120 is one, and the negative electrode tabs 120 are disposed between the two positive electrode tabs 110. As can be understood, when manufacturing the battery cell 100, first, one positive electrode sheet 110, the separator 130, and the negative electrode sheet 120 are sequentially stacked in this order, and are wound together, and then, after one positive electrode sheet 110, the separator 130, and the negative electrode sheet 120 are partially wound, another positive electrode sheet 110 is wound from the periphery of the semi-finished product, so as to finally manufacture the battery cell 100.

It should be noted that when the battery cell 100 performs a chemical reaction, the negative electrode tab 120 may perform an electrochemical reaction simultaneously with the positive electrode tabs 110 on both sides, that is, the negative electrode tab 120 may perform an ionic conduction simultaneously with the positive electrode tabs 110 on both sides, so as to implement a dual ionic conduction of the battery cell 100.

Further, as a specific embodiment of the battery electric core 100 provided by the present invention, the positive electrode sheet 110 further includes a first substrate (not shown), and the positive electrode active material layer (not shown) is disposed on the first substrate (not shown), wherein the first substrate (not shown) is foamed nickel. Specifically, in this embodiment, the first substrate (not shown) is foamed nickel with an areal density of 320-380g/m 2.

In the present embodiment, the manufacturing process of the positive electrode sheet 110 is roughly as follows: the method comprises the steps of sequentially adding a binder, a conductive agent, an additive, a positive active substance (specifically NiOH) and pure water into a stirrer, stirring and dispersing, controlling the stirring speed and time to uniformly disperse the active substances to prepare positive slurry, coating the positive slurry on foamed nickel by continuous wet-process slurry drawing, powdering, compacting by a roller, slitting, weighing, and performing ultrasonic end face welding or ultrasonic tab welding to prepare the positive plate 110.

Further, as a specific embodiment of the battery electric core 100 provided by the present invention, the negative electrode sheet 120 further includes a second substrate (not shown), and the negative electrode active material layer (not shown) is disposed on the second substrate (not shown), wherein the second substrate (not shown) is nickel-plated steel. Specifically, in this embodiment, the second substrate (not shown) is annealed nickel-plated steel.

In this embodiment, the process of manufacturing the negative electrode sheet 120 is roughly as follows: firstly, sequentially adding a binder, a conductive agent, an additive, a negative active substance (specifically AB5 type high-temperature alloy or AB5 type low-temperature alloy) and pure water into a stirrer, stirring and dispersing, adding 1-2% of SBR emulsion after slurry is formed, stirring at a low speed of 200-400r/min for 10-30min, controlling the solid content of the slurry to be 82-86% to prepare negative slurry, and then carrying out wet-method slurry drawing by using the negative slurry, wherein the tape moving speed is controlled to be 2.0-3.5m/min; the temperature of the slurry drawing furnace is controlled to be 85-135 ℃, the negative plate 120 is dried in different temperature areas, the water content of the dried negative plate 120 is kept at 0.3-0.8%, and then the negative plate 120 is obtained through the processes of roller compaction and slitting.

Of course, in other embodiments, other methods may be adopted for manufacturing the positive electrode tab 110 and the negative electrode tab 120, which is not limited by the present invention and can be selected by a person skilled in the art according to actual situations.

Further, as a specific implementation manner of the battery electric core 100 provided by the present invention, the battery electric core 100 is cylindrical. Of course, in other embodiments, the battery cell 100 may also have other shapes, which is not limited by the present invention, and those skilled in the art may select the shape according to actual situations.

Embodiment two of the battery cell 100 of the present invention

Referring to fig. 3, the main technical features of the present embodiment are substantially the same as those of the first embodiment, and the main differences from the first embodiment are as follows:

in this embodiment, the number of the positive electrode tabs 110 is one, the number of the negative electrode tabs 120 is two, and the positive electrode tabs 110 are disposed between the two negative electrode tabs 120. As can be understood, when the battery cell 100 is manufactured, first, one negative electrode sheet 120, the separator 130 and the positive electrode sheet 110 are sequentially stacked in this order, and are wound together, and then, after one negative electrode sheet 120, the separator 130 and the positive electrode sheet 110 are wound partially, another negative electrode sheet 120 is wound from the periphery of the semi-finished product, so as to finally manufacture the battery cell 100.

It should be noted that, when the battery cell 100 performs a chemical reaction, the positive electrode tab 110 may perform an electrochemical reaction simultaneously with the negative electrode tabs 120 on both sides, that is, the positive electrode tab 110 may perform an ionic conduction simultaneously with the negative electrode tabs 120 on both sides, so as to implement a dual ionic conduction of the battery cell 100.

Based on the above battery electric core 100, the embodiment of the present invention further provides a nickel-hydrogen battery 1, wherein, as shown in fig. 4, the nickel-hydrogen battery 1 includes a steel shell 200, a battery cap 300, an electrolyte and the above battery electric core 100, the steel shell 200 includes a bottom wall (not shown) and a side wall (not shown) connected to the bottom wall, the bottom wall (not shown) and the side wall (not shown) enclose an accommodating cavity 210 having an opening, the electrolyte is stored in the accommodating cavity 210, the battery electric core 100 is soaked in the electrolyte (not shown), so that the battery electric core 100 can generate a chemical reaction, thereby realizing charging and discharging of the nickel-hydrogen battery 1.

In addition, in order to safely operate the nickel-hydrogen battery 1 and extend the service life thereof, a battery cap 300 is mounted on the top of the steel can 200 to close the receiving cavity 210. It can be understood that, the battery cap 300 can prevent foreign objects from falling into the accommodating cavity 210 to contaminate the electrolyte, thereby affecting the rate of the chemical reaction of the battery electric core 100 and reducing the performance of the nickel-hydrogen battery 1, so as to ensure the safe use of the nickel-hydrogen battery 1 and prolong the service life.

In the present embodiment, the assembly process of the nickel-metal hydride battery 1 is roughly as follows: firstly, a positive plate 110, two negative plates 120 and a diaphragm 130 are wound into a battery cell 100 which is approximately cylindrical, then the battery cell 100 is implanted into a steel shell 200, electrolyte with the OH-concentration of 7.5mol/L-8.0mol/L which is formed by potassium hydroxide/sodium hydroxide/lithium hydroxide/pure water is injected, and finally, the battery cap 300 is sealed to be formed and detected.

In summary, compared with the prior art, the nickel-metal hydride battery 1 has at least the following beneficial effects: by adopting the battery cell 100, the nickel-metal hydride battery 1 can avoid the problems of mutual interference and mutual influence of different active substances, thereby improving the performance of the nickel-metal hydride battery 1.

Further, as a specific embodiment of the nickel-metal hydride battery 1 provided by the present invention, the steel shell 200 is adapted to the shape of the battery cell 100, so as to install the battery cell 100 in the accommodation of the steel shell 200. In the present embodiment, the steel shell 200 has a cylindrical shape.

Further, as a specific embodiment of the nickel-metal hydride battery 1 provided by the present invention, the nickel-metal hydride battery 1 further includes an insulating gasket (not shown), and the insulating gasket (not shown) is disposed at the lower end of the battery electric core 100 to protect the battery electric core 100. In the present embodiment, the insulating spacer (not shown) is a disk-shaped structure.

It can be understood that, before the battery cell 100 is installed in the steel case 200, a layer of adhesive is coated on the surface of the insulating spacer (not shown), then the insulating spacer (not shown) is bonded to the bottom of the battery cell 100, and then the battery cell 100 and the insulating spacer are installed in the accommodating cavity 210 of the steel case 200 together. By adopting the structure, the problems of fragmentation and deformation caused by the extrusion of the wall of the steel shell 200 on the battery cell 100 in the installation process can be prevented, so that the safe use of the battery cell 100 is ensured.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A battery cell is characterized by comprising a positive plate, a negative plate and a diaphragm, wherein the positive plate is provided with a positive active material layer, and the negative plate is provided with a negative active material layer;

the number of one of the positive plates and the negative plates is two, the number of the other one of the positive plates and the negative plates is one, and the positive plates and the negative plates are alternately arranged;

2. The battery cell of claim 1, wherein the number of positive plates is two, the number of negative plates is one, and the negative plate is disposed between the two positive plates.

3. The battery cell of claim 1, wherein the number of positive plates is one, the number of negative plates is two, and the positive plate is disposed between the two negative plates.

4. The battery cell of any of claims 1 to 3, wherein the positive electrode sheet further comprises a first substrate, the positive electrode active material layer being disposed on the first substrate; wherein the first matrix is foamed nickel.

5. The battery cell of any of claims 1 to 3, wherein the negative electrode sheet further comprises a second substrate, the negative electrode active material layer being disposed on the second substrate; wherein the second substrate is nickel-plated steel.

6. The battery cell of claim 1, wherein the battery cell is cylindrical.

7. A nickel-metal hydride battery, characterized in that it comprises:

an electrolyte stored in the accommodating chamber; and

the battery cell of any of claims 1 to 6, immersed in the electrolyte.

8. The nickel-metal hydride battery of claim 7, wherein the steel can conforms to the shape of the battery cell.

9. The nickel-metal hydride battery of claim 7, further comprising an insulating gasket disposed at a lower end of the battery cell to protect the battery cell.

10. The nickel-metal hydride battery of claim 9, wherein the insulating spacer is a disk-like structure.