CN216597896U

CN216597896U - Nickel-hydrogen battery

Info

Publication number: CN216597896U
Application number: CN202122558280.6U
Authority: CN
Inventors: 魏园园; 王劲航
Original assignee: LEXEL BATTERY (SHENZHEN) CO Ltd
Current assignee: LEXEL BATTERY (SHENZHEN) CO Ltd
Priority date: 2021-10-22
Filing date: 2021-10-22
Publication date: 2022-05-24
Anticipated expiration: 2031-10-22

Abstract

The application relates to the field of batteries, and provides a nickel-metal hydride battery, which comprises: the steel shell comprises a bottom wall and a side wall connected to the peripheral side of the bottom wall, and an accommodating cavity is defined by the bottom wall and the side wall; the winding core is arranged in the accommodating cavity and comprises a positive plate, a diaphragm and a negative plate which are superposed and wound, and the diaphragm is positioned between the positive plate and the negative plate; and at least one negative pole lug is arranged on the negative pole piece, one end of the negative pole lug is parallel to the side wall of the steel shell, and the roll core is abutted and attached to the side wall of the steel shell. The nickel-metal hydride battery provided by the application can meet the requirement of high-rate discharge, does not need to be provided with key points, is simple in manufacturing mode, and reduces the hidden danger of battery short circuit and poor appearance.

Description

Nickel-hydrogen battery

Technical Field

The application belongs to the technical field of battery manufacturing, and particularly relates to a nickel-metal hydride battery.

Background

The nickel-hydrogen battery is usually made by winding a positive plate, a negative plate and a diaphragm into a cylindrical winding, then loading the cylindrical winding into a steel shell, and then carrying out the processes of liquid injection, welding a positive cap, rolling a groove, sealing and the like. In order to improve the high-rate discharge performance of the nickel-metal hydride battery, the battery is provided with a single or a plurality of tabs besides the positive plate, and the negative plate is also provided with a single or a plurality of negative tabs, so that the current collecting capacity of the negative electrode is enhanced in a point bottom mode. The specific operation is as follows: after winding, sleeving a cathode tab on a hollow insulating gasket, and bending the cathode tab towards the central hole of the winding core to press the insulating gasket; then, the winding is put into a shell, a welding pin is inserted into the central hole of the winding core, and bottom pointing is completed by a welding machine. Fig. 1 illustrates a nickel-metal hydride battery in the prior art, as shown in fig. 1, a negative electrode tab 1 of the nickel-metal hydride battery is bent toward a central hole of a winding core and connected to the bottom of a steel shell 2 by spot welding.

For a medium-high capacity battery or a small-diameter battery, due to the fact that the inner space is limited and the winding core is small, the spot welding pin easily scrapes the diaphragm when being inserted into the winding core, and the diaphragm is collapsed or folded to cause poor short circuit of the battery; since the spot welding pin contains copper, copper impurities may be introduced into the battery; moreover, the welding pins are thin, so that the current density is too high during bottom pointing, so that an explosion point mark is left on the outer bottom surface of the steel shell after point welding, and the appearance of the battery is influenced. And for the structure of a plurality of negative pole lugs, after the lugs are overlapped, the thickness of a weldment is increased, and the phenomenon of insufficient soldering is easy to occur at the bottom of a point.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application aims to provide a welding method for welding a cathode tab of a nickel-metal hydride battery to a steel shell, so that the problems that in the prior art, the separator is easy to scrape, copper impurities are introduced into the battery, and the battery is marked and rosin-welded are solved.

To achieve the above object, the present application provides a nickel-metal hydride battery comprising:

the steel shell comprises a bottom wall and a side wall connected to the bottom wall, and an accommodating cavity is defined by the bottom wall and the side wall;

the winding core is arranged in the accommodating cavity and comprises a positive plate, a diaphragm and a negative plate which are superposed and wound, and the diaphragm is positioned between the positive plate and the negative plate; and at least one negative pole lug is arranged on the negative pole piece, one end of the negative pole lug is parallel to the side wall of the steel shell, and the roll core is abutted and attached to the side wall of the steel shell.

In some embodiments, the negative electrode tab comprises a first attaching portion and a second attaching portion which are connected in a bent mode, the first attaching portion is parallel to and attached to the bottom wall, and the second attaching portion is parallel to and attached to the side wall.

In some embodiments, the negative electrode tab further includes a connection part connected between the negative electrode tab and the first fitting part.

In some embodiments, the side wall of the steel shell is provided with a rolling groove, and the bottom of the rolling groove protrudes towards the accommodating cavity of the steel shell;

and the second joint part of the negative pole lug is positioned between the bottom wall of the steel shell and the rolling groove.

In some embodiments, the middle part of the winding core is provided with a winding core central hole, and the first attaching part extends to the side wall of the steel shell towards the direction far away from the winding core central hole.

In some embodiments, the number of the negative electrode tabs is multiple, and the multiple negative electrode tabs are respectively arranged on two sides of the central hole of the winding core.

In some embodiments, the number of the negative electrode tabs is two, and the two negative electrode tabs are respectively attached to two opposite sides of the side wall.

In some embodiments, the nickel-metal hydride battery further comprises an electrolyte, and the electrolyte is infiltrated in the core.

In some embodiments, the steel shell is cylindrical and the winding core is in the form of a drum.

In some embodiments, the material of the negative electrode tab includes any one of pure nickel, nickel-plated steel, nickel alloy, and nickel-plated stainless steel.

The application provides a nickel-metal hydride battery includes the box hat and locates the book core in the box hat, because the one end of rolling up the negative pole utmost point ear in the core is on a parallel with the lateral wall of box hat just roll up the support of core under the laminating in the lateral wall of box hat need not to fix the negative pole utmost point ear through the mode of spot welding, effectively solved among the prior art because the easy scraping diaphragm that the spot welding caused, introduce the battery with copper impurity and have the problem of impression and rosin joint. The nickel-metal hydride battery can be a medium-high capacity battery or a small-diameter battery, can meet the high-rate discharge requirement of the battery, does not need to be provided with key points, is simple in manufacturing mode, and reduces the hidden danger of short circuit of the battery and poor appearance.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

FIG. 1 is a schematic diagram of a prior art nickel-metal hydride battery;

fig. 2 is a schematic structural diagram of a nickel-metal hydride battery according to an embodiment of the present disclosure;

fig. 3 is a schematic structural diagram of a nickel-metal hydride battery according to another embodiment of the present disclosure.

Wherein, in the figures, the respective reference numerals:

1. a negative electrode tab; 2. a steel shell;

100. a nickel-metal hydride battery;

10. a steel shell; 11. a bottom wall; 12. a side wall; 13. an accommodating chamber; 14. rolling a groove;

20. a winding core; 21. a positive plate; 22. a diaphragm; 23. a negative plate; 24. a central hole of the winding core;

30. a negative electrode tab; 31. a first bonding portion; 32. a second bonding portion; 33. a connecting portion.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings that is solely for the purpose of facilitating the description and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the present application.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

Referring to fig. 2, an embodiment of the present application provides a nickel-metal hydride battery 100, which includes a steel can 10 and a winding core 20 disposed in the steel can 10.

The steel shell 10 comprises a bottom wall 11 and a side wall 12 connected to the bottom wall 11, wherein the bottom wall 11 and the side wall 12 enclose a containing cavity 13.

The winding core 20 is arranged in the accommodating cavity 13, the winding core 20 comprises a positive electrode sheet 21, a diaphragm 22 and a negative electrode sheet 23 which are stacked and wound, and the diaphragm 22 is positioned between the positive electrode sheet 21 and the negative electrode sheet 23.

The negative plate 23 is provided with at least one negative electrode tab 30, and one end of the negative electrode tab 30 is parallel to the side wall 12 of the steel shell 10 and is attached to the side wall 12 of the steel shell 10 under the support of the winding core 20.

When in manufacturing, firstly, the positive plate 21, the diaphragm 22 and the negative plate 23 are superposed and wound into the winding core 20, the negative pole tab 30 is wound around the bottom of the winding core 20 and is bent to one side of the winding core 20, and then the winding core 20 is placed in the accommodating cavity 13 of the steel shell 10; because the assembly elasticity of the roll core 20 is large, the roll core 20 can be slightly loosened after entering the shell, and the roll core 20 can further expand after being activated by the battery, so that the roll core 20 can support the negative pole lug 30 on the side wall 12 of the steel shell 10, and the negative pole lug 30 is guaranteed to be tightly attached to and well contacted with the side wall 12 of the steel shell 10.

As shown in fig. 2, the outermost side of the winding core 20 is the negative electrode sheet 23, and the negative electrode tab 30 and the positive electrode sheet 21 are prevented from being short-circuited. It will be appreciated that the outermost side of the jellyroll 20 can also be the separator.

Optionally, the assembly tightness of the winding core 20 is 88% to 92%, and after the winding core 20 is mounted in the steel can 10, the winding core 20 itself is slightly loosened and further expanded after the battery is activated, so that the winding core 20 and the negative electrode tab can be closely attached to the side wall 12 of the steel can 10.

In this embodiment, the nickel-metal hydride battery 100 includes the steel can 10 and locates the core 20 of rolling up in the steel can 10, because the one end of the negative pole utmost point ear 30 in the core 20 is on a parallel with the lateral wall 12 of the steel can 10 and the lateral wall 12 of laminating in the steel can 10 under the support of rolling up the core 20, need not to fix the negative pole utmost point ear 30 through the mode of pointing the end, effectively solved among the prior art because the easy scratch diaphragm 22 that causes at the end of pointing, introduce the battery with copper impurity, and there is the problem of impression and rosin joint.

The nickel-metal hydride battery 100 can be a medium-high capacity battery or a small-diameter battery, can meet the high-rate discharge requirement of the battery, does not need to be provided with key points, and is simple in manufacturing mode.

In one embodiment, the negative electrode tab 30 includes a first attaching portion 31 and a second attaching portion 32 connected by bending, the first attaching portion 31 is parallel to and attached to the bottom wall 11, and the second attaching portion 32 is parallel to and attached to the side wall 12. Through adopting above-mentioned technical scheme, negative pole utmost point ear 30 is supported by rolling up core 20 and is held in steel-shelled 10, and first laminating portion 31 and the second laminating portion 32 homoenergetic of negative pole utmost point ear 30 can keep the good contact with steel-shelled 10, and stability is better.

Optionally, the first attaching portion 31 is vertically connected to the second attaching portion 32, and it can be understood that the angle between the first attaching portion 31 and the second attaching portion 32 may also be an acute angle or an obtuse angle depending on the shape of the steel shell 10.

In one embodiment, the negative electrode tab 30 further includes a connection part 33, and the connection part 33 is connected between the negative electrode sheet 23 and the first lamination part 31.

As shown in fig. 2, in order to avoid short-circuiting between the positive electrode tab 21 and the negative electrode tab 23, the length of the separator 22 may be greater than the lengths of the positive electrode tab 21 and the negative electrode tab 23. After the winding core 20 is placed in the steel can 10, the connecting portion 33 of the negative electrode tab 30 extends from the negative electrode sheet 23 to the bottom wall 11 of the steel can 10, and the first attaching portion 31 is attached to the bottom wall 11.

In one embodiment, the side wall 12 of the steel shell 10 is provided with a rolling groove 14, the opening of the rolling groove 14 faces outwards, and the bottom of the rolling groove 14 protrudes towards the inside of the accommodating cavity 13 of the steel shell 10; the second attaching part 32 of the negative pole tab 30 is positioned between the bottom wall 11 of the steel shell 10 and the rolling groove 14, and the exposed length of the negative pole tab is less than the height of the rolling groove 14. The "exposed length of the negative electrode tab" is the length of the negative electrode tab 30 exceeding the base of the negative electrode sheet.

As shown in fig. 1, in the prior art, the negative tab 30 is spot-welded to the bottom of the steel can 10, so the exposed length of the negative tab 30 needs to be less than the inner diameter of the steel can 10; as shown in fig. 2, in the nickel-metal hydride battery 100 according to the embodiment of the present invention, since the second bonding portion 32 of the negative electrode tab 30 is bonded to the side wall 12 of the steel can 10, the exposed length of the negative electrode tab 30 may be smaller than the height of the rolling groove 14. Therefore, for the battery model with the steel shell 10 height larger than the inner diameter of the steel shell 10, the cathode tab 30 of the nickel-metal hydride battery 100 provided by the application can adopt a specification with a length longer than that of the prior art, and the current collecting effect of the cathode of the battery is increased, so that the internal resistance of the battery can be further reduced, and the high-rate discharge performance is improved.

As shown in fig. 2, the central portion of the winding core 20 is provided with a core central hole 24, and the first fitting portion 31 extends to the side wall 12 of the steel shell 10 in a direction away from the core central hole 24.

The core center hole 24 is a center hole formed by winding the core 20 and penetrates through the upper end and the lower end of the core 20; in this embodiment, since the negative electrode tab 30 does not need to be connected to the bottom wall 11 of the steel shell 10 by spot welding, the negative electrode tab 30 does not need to extend toward the central hole 24 of the winding core, and the current collecting effect of the battery negative electrode can be effectively increased within a limited length range.

In one embodiment, the nickel-metal hydride battery 100 further includes an electrolyte solution, and the electrolyte solution is soaked in the roll core 20. It can be understood that the electrolyte soaks in the winding core 20 to make the winding core 20 generate a certain expansion, so that the winding core 20 can support the negative electrode tab 30 on the side wall 12 of the steel shell 10, and the fixing effect of the negative electrode tab 30 is better.

In one embodiment, the steel can 10 is cylindrical and the winding core 20 is roll-shaped, so the nickel-metal hydride battery 100 is a cylindrical battery.

Optionally, an insulating gasket is disposed on the bottom wall 11 of the steel shell 10. The insulating spacers serve to insulate between the core 20 and the steel can 10.

In an embodiment, the material of the negative electrode tab 30 includes any one of pure nickel, nickel-plated steel, nickel alloy, and nickel-plated stainless steel.

It will be appreciated that the nickel-metal hydride battery 100 further comprises one or more positive tabs attached to the positive tab 21 on the side of the steel can 10 facing away from the bottom wall 11.

Referring to fig. 3, another embodiment of the present disclosure provides a nickel-metal hydride battery 100 including a steel can 10 and a winding core 20 disposed in the steel can 10. The steel shell 10 includes a bottom wall 11 and a side wall 12 connected to the peripheral side of the bottom wall 11, and the bottom wall 11 and the side wall 12 enclose an accommodating cavity 13. The winding core 20 is arranged in the accommodating cavity 13, the winding core 20 comprises a positive electrode sheet 21, a diaphragm 22 and a negative electrode sheet 23 which are stacked and wound, and the diaphragm 22 is positioned between the positive electrode sheet 21 and the negative electrode sheet 23. The negative pole piece 23 is provided with at least one negative pole tab 30, and one end of the negative pole tab 30 is parallel to the side wall 12 of the steel shell 10 and is attached to the side wall 12 of the steel shell 10 under the abutting of the winding core 20.

In the present embodiment, the number of the negative electrode tabs 30 is plural, and the plural negative electrode tabs 30 are respectively disposed on both sides of the winding core center hole 24. As shown in fig. 3, the number of the negative electrode tabs 30 in the present embodiment is two, and the two negative electrode tabs 30 are respectively attached to opposite sides, i.e., left and right sides in fig. 3, of the side wall 12.

The nickel-metal hydride battery 100 provided by the embodiment of the application can fix a plurality of negative electrode tabs 30 on the side wall 12 of the steel shell 10 respectively, and the negative electrode tabs 30 do not need to be fixed through bottom pointing, so that the negative electrode tabs 30 do not need to be bent towards the central hole 24 of the winding core, and the problem of insufficient soldering existing in the prior art due to spot welding of a plurality of negative electrode tabs 30 is avoided; by providing a large number of negative electrode tabs 30, the current collecting effect of the battery negative electrode can be increased.

The performance of the nickel-metal hydride battery 100 provided by the present application is illustrated by an embodiment.

Taking a 14650 type cylindrical nickel-metal hydride battery 100 with the capacity of 2000mAh as an example, the designed assembly tightness is 90%, the diameter of a central hole 24 of a winding core is 2.0mm, a negative pole tab 30 is a single pole tab, and a pure nickel strap with the width of 4.0mm and the thickness of 0.1mm is selected. On the basis, the nickel-metal hydride battery 100 was manufactured by using the methods of example 1, example 2 and the middle point of the prior art as comparative examples, and the internal resistance and the 3C discharge performance of the battery were tested.

TABLE 1 parameters of nickel-hydrogen battery and 3C discharge performance table

Referring to table 1, the internal resistance and 3C discharge performance of the nickel-metal hydride battery 100 manufactured by the technical scheme in example 1 of the present application are equivalent to those of the prior art in the case that the remaining characteristics are the same as those of the prior art; in example 2, the length of the negative electrode tab 30 was increased to 15mm, and the remaining characteristics of this example were the same as those of example 1, and the internal resistance and 3C discharge performance of the battery were slightly better than those of the prior art.

The nickel-metal hydride battery 100 provided by the application can meet the high-rate discharge requirement of the battery, reduces the operation difficulty, and reduces the hidden danger of battery short circuit and poor appearance.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A nickel-metal hydride battery, comprising:

2. The nickel-metal hydride battery of claim 1, wherein the negative tab includes a first engaging portion and a second engaging portion connected by a bend, the first engaging portion being parallel to and engaging the bottom wall, and the second engaging portion being parallel to and engaging the side wall.

3. The nickel-metal hydride battery of claim 2, wherein the negative electrode tab further comprises a connecting portion connected between the negative electrode tab and the first attaching portion.

4. The nickel-metal hydride battery as claimed in claim 2, wherein the side wall of the steel case is provided with a rolling groove, and the bottom of the rolling groove protrudes towards the accommodating cavity of the steel case;

5. The nickel-metal hydride battery as claimed in claim 2, wherein a central hole of the winding core is formed in the middle of the winding core, and the first engaging portion extends to the side wall of the steel can toward a direction away from the central hole of the winding core.

6. The nickel-metal hydride battery as claimed in claim 5, wherein the number of the negative electrode tabs is plural, and the plural negative electrode tabs are respectively provided on both sides of the center hole of the winding core.

7. The nickel-metal hydride battery of claim 6, wherein the number of the negative electrode tabs is two, and two of the negative electrode tabs are respectively attached to opposite sides of the side wall.

8. The nickel-metal hydride battery of any of claims 1-7, further comprising an electrolyte, wherein the electrolyte is impregnated within the core.

9. The nickel-metal hydride battery of any of claims 1-7, wherein the steel can has a cylindrical shape and the winding core has a roll shape.

10. The nickel-metal hydride battery according to any one of claims 1 to 7, wherein the material of the negative electrode tab comprises any one of pure nickel, nickel-plated steel, nickel alloy and nickel-plated stainless steel.