CN213546382U

CN213546382U - 9V lithium battery

Info

Publication number: CN213546382U
Application number: CN202022892913.2U
Authority: CN
Inventors: 谢红卫; 吴葆荪
Original assignee: NINGBO GP ENERGY CO Ltd
Current assignee: NINGBO GP ENERGY CO Ltd
Priority date: 2020-12-03
Filing date: 2020-12-03
Publication date: 2021-06-25
Anticipated expiration: 2030-12-03

Abstract

The utility model discloses a 9V lithium battery, which comprises a shell, three 3V single lithium batteries and a PTC element, wherein the upper end of the shell is provided with a positive output terminal and a negative output terminal, and the three 3V single lithium batteries are positioned in the shell and are sequentially connected with each other in series to form a series battery pack, the series battery pack comprises a positive end and a negative end, and the positive end of the series battery pack is electrically connected with the positive output terminal of the shell; the PTC element comprises two nickel sheets and thermosensitive resin between the two nickel sheets, the two nickel sheets are staggered with each other to form a first end part, a second end part and an overlapping part, the thermosensitive resin is positioned in an interlayer of the overlapping part, the first end part is welded at the negative end of the series battery pack, the second end part is connected with the negative output terminal of the shell, the circuit protection function is realized by only using one PTC element, and the production cost is further reduced; the internal space of the battery is saved, and the cost of the nickel strap or the lead is saved.

Description

9V lithium battery

Technical Field

The utility model relates to a lithium metal battery field especially relates to 9V lithium ion battery integrated configuration field.

Background

The 9V battery is widely applied to the market of civil consumer electronics, and the CR9V always takes a leading position in the high-end market due to the technical characteristics of high energy density, high output power, long service life and the like.

For example, in patent document CN10142004913, a 9V lithium battery is disclosed, which includes three single lithium batteries and three battery holders connected with each other, wherein the three single lithium batteries are respectively located in the three battery holders, and the three single lithium batteries are connected with each other in series to form a 9V battery.

When the voltage at two ends of the lithium battery is too high, the dangers of leakage, smoke, combustion and burst of the battery exist, and the series battery pack is easy to generate forced discharge phenomenon due to consistency difference, so that the safety is poorer. For this, as shown in fig. 1, a PTC element 20, i.e., a thermistor, is generally connected within the positive electrode cap 10 of each unit lithium battery. The PTC element 20 can protect against overcharge, overcurrent, short circuit, over-temperature, etc. and ensure that the battery will not have safety problems when misused or abused.

In the actual circuit operation process, the PTC element in one single lithium battery is started to reduce the current intensity, so that the circuit is protected, and the PTC elements in the other two single lithium batteries do not play a role. The price of the PTC elements is high, and the method of arranging the PTC elements in the three single lithium batteries increases the production cost and causes the waste of resources.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a lower 9V lithium cell of manufacturing cost is provided.

The utility model provides a technical scheme that above-mentioned technical problem adopted does: the 9V lithium battery comprises a shell, three sections of 3V single lithium batteries and a PTC element, wherein the upper end of the shell is provided with a positive output terminal and a negative output terminal, the three sections of 3V single lithium batteries are positioned in the shell and sequentially connected in series to form a series battery pack, the series battery pack comprises a positive end and a negative end, and the positive end of the series battery pack is electrically connected with the positive output terminal of the shell;

the PTC element comprises two nickel sheets and heat-sensitive resin between the two nickel sheets, the two nickel sheets are staggered with each other to form a first end part, a second end part and an overlapping part, the heat-sensitive resin is positioned in an interlayer of the overlapping part, the first end part is welded at the negative end of the series battery pack, and the second end part is connected with the negative output terminal of the shell.

The utility model provides a further preferred technical scheme who above-mentioned technical problem adopted is: the single lithium battery is a cylindrical lithium-manganese battery.

The utility model provides a further preferred technical scheme who above-mentioned technical problem adopted is: the three sections of single lithium batteries are longitudinally distributed in the shell side by side after being horizontally laid, and the electrode orientation of each section of single lithium battery is the same.

The utility model provides a further preferred technical scheme who above-mentioned technical problem adopted is: the positive electrode cap of the first section of single lithium battery from top to bottom is connected with the positive electrode output terminal, and the bottom of the negative electrode shell of the third section of single lithium battery is connected with the PTC element.

The utility model provides a further preferred technical scheme who above-mentioned technical problem adopted is: and insulating sheets are attached to the bottoms of the negative electrode shells of the first section of single lithium battery and the second section of single lithium battery.

The utility model provides a further preferred technical scheme who above-mentioned technical problem adopted is: the length of the first end part and the second end part is the same.

The utility model provides a further preferred technical scheme who above-mentioned technical problem adopted is: the width of the nickel sheet is 4-9 mm, the length of the nickel sheet is 25-45 mm, the thickness of the nickel sheet is 0.2-0.4 mm, and the length of the first end part and the second end part is 6-10 mm.

The utility model provides a further preferred technical scheme who above-mentioned technical problem adopted is: the shell is formed by injection molding of high-strength high-flame-retardant modified polyphenyl ether.

The utility model provides a further preferred technical scheme who above-mentioned technical problem adopted is: the casing include the supporting part of rectangle frame and frame internal symmetry distribution, the supporting part constitute by the arc baffle that extends from the frame both sides, the supporting part enclose to close and form three can with monomer lithium cell support location in order to prevent the battery compartment of adjacent monomer lithium cell mutual contact.

The utility model provides a further preferred technical scheme who above-mentioned technical problem adopted is: the supporting part and the inner wall of the outer frame are provided with hollow areas.

Compared with the prior art, the utility model has the advantages that all establish the technology of PTC component in the three section monomer lithium cell among the with prior art and compare, the utility model discloses it is external with the PTC component for every section monomer lithium cell's forming process is simpler, only utilizes a PTC component just to realize circuit protection's function moreover, has further reduced manufacturing cost.

And the utility model discloses two nickel pieces in the well PTC component distribute in a staggered way to form at both ends with two tip of being connected with the electricity, first end is direct to be connected with the monomer lithium cell, need not reuse nickel strap or other lead wires in addition and connect, has both practiced thrift the battery inner space, saves nickel strap or lead wire cost again, has still reduced the resistance of circuit, improves the performance of battery.

Drawings

The present invention will be described in further detail below with reference to the drawings and preferred embodiments, but those skilled in the art will appreciate that the drawings are only drawn for the purpose of explaining the preferred embodiments, and therefore should not be taken as limiting the scope of the present invention. Furthermore, unless specifically stated otherwise, the drawings are merely schematic representations based on conceptual representations of elements or structures depicted and may contain exaggerated displays and are not necessarily drawn to scale.

Fig. 1 is a schematic diagram of a single lithium battery in the background art of the present invention;

fig. 2 is a schematic diagram of a single lithium battery according to a preferred embodiment of the present invention;

fig. 3 is a first schematic view illustrating spot welding of a single lithium battery according to a preferred embodiment of the present invention;

fig. 4 is a schematic diagram of spot welding of a single lithium battery in a preferred embodiment of the present invention;

fig. 5 is a schematic view of an insulating tube sleeve of a single lithium battery according to a preferred embodiment of the present invention;

fig. 6 is a first schematic diagram of a 9V lithium battery according to a preferred embodiment of the present invention;

fig. 7 is a second schematic diagram of a 9V lithium battery according to a preferred embodiment of the present invention;

fig. 8 is a third schematic diagram of a 9V lithium battery according to a preferred embodiment of the present invention;

fig. 9 is a schematic view of a PTC element in a preferred embodiment of the present invention;

fig. 10 is a partial schematic view of a housing in a preferred embodiment of the invention.

Detailed Description

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Those skilled in the art will appreciate that the description is illustrative only, and is not to be construed as limiting the scope of the invention.

It should be noted that: like reference numerals refer to like items in the following figures, and thus, once an item is defined in one figure, it may not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "inside" and "outside" are used for indicating the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship that the utility model is usually placed when using, and are only for convenience of describing the present invention and simplifying the description, but not for indicating or implying that the device or element to be referred must have a specific position, be constructed and operated in a specific position, and thus should not be construed as limiting the present invention.

As shown in fig. 6, the present embodiment provides a 9V lithium battery including a case 200 having a positive output terminal 5 and a negative output terminal 6 at the upper end thereof, three 3V unit lithium batteries 100 disposed in the case 200, and a PTC element 11. Wherein, three sections of single lithium batteries 100 are connected in series in sequence to form a series battery pack. The series battery has a positive terminal F1 and a negative terminal F2, the positive terminal F1 of the series battery being electrically connected to the positive output terminal 5 of the case 200; the negative electrode terminal F2 of the series battery is connected in series with the PTC device 11, and the PTC device 11 is electrically connected to the negative electrode output terminal 6 of the case 200.

As shown in fig. 9, PTC element 11 includes two nickel plates 111 and heat-sensitive resin 112 therebetween, wherein two nickel plates 111 are offset from each other to form first end portion 11a, second end portion 11b, and overlapping portion 11c, wherein heat-sensitive resin 112 is located in the interlayer of overlapping portion 11c, first end portion 11a is welded to negative electrode terminal F2 of the series battery, and second end portion 11b is connected to negative electrode output terminal 6 of case 200.

It should be noted that, in the present embodiment, as shown in fig. 2, the PTC element 11 is not provided between the positive electrode cap 1 and the negative electrode can 2 of each unit lithium battery 100.

In the normal operating state, the external PTC element 11 has a much smaller resistance than the remaining resistors in the circuit. When the current increases rapidly, the PTC reacts to an overcurrent condition, changing from a low resistance to a high resistance to protect the battery. The increase in impedance limits the passage of current, thereby reducing the current in the battery to a value that any circuit element can safely carry, and protecting the battery from damage.

Compared with the process of arranging the PTC elements 11 in the three single lithium batteries 100 in the prior art, the PTC elements 11 are arranged externally, so that the forming process of each single lithium battery 100 is simpler, the circuit protection function is realized by only using one PTC element 11, and the production cost is further reduced.

As shown in fig. 6 and 9, in the PTC element 11 of the present embodiment, two nickel sheets 111 are distributed in a staggered manner, so that two end portions for electrical connection are formed at two ends, and the first end portion 11a is directly connected to the single lithium battery 100 without using a nickel strap 3 or other lead wires, which not only saves the internal space of the battery, but also saves the cost of the nickel strap 3 or lead wires, and also reduces the resistance of the circuit and improves the performance of the battery.

Preferably, as shown in fig. 2, 6-8, the single lithium battery 100 is a cylindrical lithium manganese battery. The three sections of single lithium batteries 100 are longitudinally distributed in the housing 200 side by side after being laid horizontally, and the electrode orientation of each section of single lithium battery 100 is the same.

Further, from top to bottom, the side of the negative electrode casing 2 of the first section of lithium battery cell 100 is connected to the positive electrode cap 1 of the second section of lithium battery cell 100 through the L-shaped nickel strap 3, and the side of the negative electrode casing 2 of the second section of lithium battery cell 100 is connected to the positive electrode cap 1 of the third section of lithium battery cell 100 through the L-shaped nickel strap 3, so as to form a series battery pack. The positive electrode cap 1 of the first section of lithium battery cell 100 is connected to the positive electrode output terminal 5 through the L-shaped nickel strap 3, and the bottom of the negative electrode can 2 of the third section of lithium battery cell 100 is directly connected to the PTC element 11.

The arrangement and the structure selection of the nickel strap 3 enable the structure of the battery and the connecting circuit to be more compact, and the internal space of the battery is saved.

As shown in fig. 6 to 8, the entire PTC element 11 spans the bottom of the negative electrode case 2 of the three-cell lithium battery 100. The first end 11a of the PTC element 11 is welded to the bottom of the negative electrode case 2 of the third unit lithium battery 100, and the second end 11b is welded to the inside of the negative electrode output terminal 6 of the case 200 through the L-shaped nickel strap 3, and thus

It should be noted that the length of the PTC element 11 is adapted to the span of three single lithium batteries 100, so that the second end 11b of the PTC element 11 can be directly welded to the negative output terminal 6 of the housing 200, thereby further saving the internal space of the battery, saving the cost of the nickel strap 3, reducing the resistance of the circuit, and improving the performance of the battery.

Preferably, in order to avoid short circuit caused by the contact between the PTC element 11 and the negative electrode cases 2 of the first two single lithium batteries 100, the insulating sheet 9 is attached to the bottom of the negative electrode cases 2 of the first single lithium battery 100 and the second single lithium battery 100 in this embodiment. In this embodiment, the insulating sheet 9 is made of PC material and has a thickness of 0.25 mm.

In this embodiment, the two nickel sheets 111 of the PTC element 11 have the same width, length and thickness, the width is 4-9 mm, the length is 25-45 mm, and the thickness is 0.2-0.4 mm.

Preferably, the width is 7 mm, the length is 30 mm, and the thickness is 0.25 mm. And the first end portion 11a and the second end portion 11b have the same length, and the first end portion 11a and the second end portion 11b have a length of 6-10 mm.

As shown in the figure, the case 200 of the 9V lithium battery includes a rectangular outer frame 201 and support portions 202 symmetrically distributed in the outer frame 201, and the rectangular outer frame 201 includes a base portion J in the middle and side plates located at both sides of the base portion.

The base J includes a front wall J1, a rear wall J2, a top wall J3, and a bottom wall J4, and the positive output terminal 5 and the negative output terminal 6 are provided on the top wall J3 of the base J.

Support portion 202 is located within base portion J and includes projecting members symmetrically disposed on the inner sides of front wall J1 and rear wall J2, and the projecting members on each side include three interconnected arcuate recesses 12. In this way, the raised members of the front and rear walls enclose three battery compartments 14 that support and position the individual lithium batteries 100 to prevent adjacent individual lithium batteries 100 from contacting each other.

The two ends of the battery compartment 14 are open, and each single lithium battery 100 can be plugged into the battery compartment 14 from the open ends. And the adjacent places of the three battery bins 14 are communicated with each other, so that the whole series battery pack can be integrally placed in the base J, the three single lithium batteries 100 can be firstly connected in series and then integrally placed in the shell 200, and the 9V lithium battery is more convenient to manufacture.

Preferably, the supporting portion 202 is composed of arc-shaped partitions 15 extending from two sides of the outer frame 201, and the arc-shaped partitions 15 and the inner wall of the outer frame 201 form a hollow area 13. This saves material and enhances the impact resistance of the housing 200.

Further preferably, the housing 200 is injection molded from a high strength, high flame retardant modified polyphenylene ether.

In this embodiment, the method for manufacturing a 9V lithium battery specifically includes the following steps:

the method comprises the following steps: as shown in fig. 3-4, two single lithium batteries are taken, and one end of the nickel strap 3 is spot-welded on the side surface of the negative electrode shell 2 of the single lithium battery, which is close to the positive electrode cap 1. Preferably, the nickel strap 3 is L-shaped, and the other end of the nickel strap 3 faces outward. The nickel band 3 for spot welding was 0.10mm in thickness and 3.6mm in width.

Step two: as shown in fig. 5, the insulating sleeve 4 is sleeved on the large body part of the negative electrode shell of the two single lithium batteries welded with the nickel straps 3 in the first step and the other single lithium battery C not welded with the nickel straps 3, so as to prevent short circuit between the single lithium batteries. Preferably, the insulating sleeve 4 is of PET material, with a thickness of 0.25 mm.

Step three: as shown in fig. 6 to 8, three single lithium batteries 100 are loaded into the battery compartment from the opening of the base of the case 200 in the same direction as the positive and negative poles. Two of the lithium battery cells 100(A, B) to which the nickel straps 3 are welded are placed at the upper end of the case 200, i.e., at the end near the positive output terminal 5 and the negative output terminal 6, and the lithium battery cell 100C to which the nickel straps 3 are not welded is placed at the lowermost end.

Step four: the other end of the nickel strap 3(A, B) of the single lithium battery 100 welded with the nickel strap 3 is spot-welded on the positive electrode cap 1 of the next adjacent single lithium battery 100 in sequence, so that three sections of single lithium batteries 100 are connected in series in sequence to form a series battery pack.

Step five: and welding a positive electrode connecting tab 7 of the positive electrode output terminal 5 on the positive electrode cap 1 of the first single lithium battery 100A of the series battery pack.

Step six: the insulating sheet 9 is attached to the bottom of the negative electrode case 2 of the first single lithium battery 100 and the second single lithium battery 100.

Step seven: the second end 11b of the PTC element 11 is welded to the negative connection tab 8 of the negative output terminal 6 of the case 200, and the first end 11a of the PTC element 11 is spot-welded to the bottom of the negative case 2 of the third lithium battery cell 100C.

Step eight: the side plates of the case 200 are connected to both sides of the base by means of ultrasonic welding or glue bonding, etc., thereby closing the entire case 200 and completing the assembly of the 9V lithium battery.

It is right above the utility model provides a 9V lithium cell has carried out detailed introduction, and it is right to have used specific individual example herein the utility model discloses a principle and implementation mode have been elucidated, and the description of above embodiment is only used for helping to understand the utility model discloses and core thought. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.

Claims

The 1.9V lithium battery is characterized by comprising a shell, three sections of 3V single lithium batteries and a PTC element, wherein the upper end of the shell is provided with a positive output terminal and a negative output terminal;

the PTC element comprises two nickel sheets and heat-sensitive resin between the two nickel sheets, the two nickel sheets are staggered with each other to form a first end part, a second end part and an overlapping part, the heat-sensitive resin is positioned in an interlayer of the overlapping part, the first end part is welded at the negative end of the series battery pack, and the second end part is connected with the negative output terminal of the shell.
2. The 9V lithium battery of claim 1 wherein said single cell lithium battery is a cylindrical lithium manganese battery.
3. The 9V lithium battery of claim 2, wherein three sections of the single lithium batteries are longitudinally distributed in the shell side by side after lying, and the electrode orientation of each section of the single lithium battery is the same.
4. A9V lithium battery as claimed in claim 3, wherein the positive electrode cap of the first lithium battery cell from top to bottom is connected to said positive electrode output terminal, and the bottom of the negative electrode can of the third lithium battery cell is connected to said PTC element.
5. The 9V lithium battery of claim 3 wherein the negative electrode casing of the first and second individual lithium batteries have an insulating sheet attached to the bottom thereof.
6. A 9V lithium battery according to claim 1 wherein the first end portion and the second end portion are the same length.
7. The 9V lithium battery of claim 1 wherein said nickel plate has a width of 4 to 9 mm, a length of 25 to 45 mm, a thickness of 0.2 to 0.4 mm, and a length of 6 to 10mm for said first and second end portions.
8. The 9V lithium battery of claim 1 wherein said housing is injection molded from a high strength, high flame retardant modified polyphenylene ether.
9. The 9V lithium battery of claim 8, wherein the housing comprises a rectangular outer frame and support portions symmetrically distributed in the outer frame, the support portions are formed by arc-shaped partition plates extending from two sides of the outer frame, and the support portions surround three battery compartments for supporting and positioning the single lithium batteries to prevent adjacent single lithium batteries from contacting each other.
10. The 9V lithium battery as claimed in claim 9, wherein the supporting portion and the inner wall of the outer frame have a hollow area.