HK1157504B - Lithium ion battery pack - Google Patents

Abstract

The present invention discloses a lithium-ion battery pack, comprising a lithium-ion battery and a circuit protection board. The lithium-ion battery comprises a housing, which includes a substrate. The substrate is provided with a pole for extracting electrodes, and an insulating member is provided between the substrate and the pole. The positive and negative electrodes of the protection board are electrically connected to the positive and negative electrodes of the lithium-ion battery, respectively. The insulating member around the pole extends along the outer side of the substrate and forms at least two protrusions. The protection board is fixedly set on the protrusions.The lithium-ion battery pack of the present invention simplifies the production process, reduces production costs, shortens the manufacturing cycle, and achieves miniaturization and thinning of the battery pack.

Description

Lithium ion battery pack

Technical Field

The invention relates to the field of lithium batteries, in particular to a lithium ion battery pack.

Background

Portable electronic devices are becoming smaller and thinner, and the trend is to make batteries and battery packs as their power sources smaller, thinner, and higher in capacity. Lithium ion batteries are widely used as small-sized and high-capacity batteries because of their high voltage and high energy density, and among them, flat-square lithium ion secondary batteries are suitable for thinning of devices.

The lithium ion battery is provided with a circuit board constituting a battery protection circuit for protecting the secondary battery from overcharge or overdischarge. The circuit board and the lithium ion battery are arranged in the assembly shell together to form a battery pack which can be directly used for portable equipment. As shown in fig. 1, the positive and negative electrodes of the protection plate 1 'are electrically connected to the rivet 3' and the nickel ribbon 4 'on the substrate 2' of the lithium ion battery, respectively, and the protection plate 1 ', the substrate 2', the battery case 5 ', and the like are housed together in the pack case 6'.

However, since the module case is generally manufactured by resin molding, the manufacturing cost of a mold for molding is high, and thus the cost of the module case increases the cost of the lithium ion battery, resulting in an increase in cost. Further, since the mold development time is long, it is difficult to meet the demand of a short time to market for a new type of battery pack used for electronic devices such as a mobile phone. In addition, the thickness of the resin molding of the module case is limited. However, in contrast, in order to maintain the battery strength, the battery pack needs to be made thicker, and there is a limit to the size reduction and thickness reduction of the battery pack.

Disclosure of Invention

The present invention addresses the above-described problems of the prior art and provides a miniaturized, thin lithium ion battery pack having a high volume density.

In order to solve the technical problem, the invention provides a lithium ion battery pack, which comprises a lithium ion battery and a circuit protection board, wherein the lithium ion battery comprises a shell, the shell comprises a substrate, a pole for leading out an electrode is arranged on the substrate, an insulating part is arranged between the substrate and the pole, the positive electrode and the negative electrode of the protection board are respectively electrically connected with the positive electrode and the negative electrode of the lithium ion battery, the insulating part at the periphery of the pole extends along the outer side of the substrate and forms at least two bulges, and the protection board is fixedly arranged on the.

Preferably, the protrusion is columnar, the tail end of the protrusion is provided with a positioning end, the middle of the protrusion is provided with a positioning table, the protection plate is provided with an opening at the position corresponding to the protrusion, and the positioning end penetrates through the opening on the protection plate to fix the protection plate on the positioning table.

Further preferably, the positioning end surface is flush with the surface of the protection plate.

And the positive electrode and the negative electrode of the protection plate are respectively connected with the positive electrode and the negative electrode of the lithium ion battery through leads. In a specific embodiment of the invention, the positive and negative electrodes of the lithium ion battery are led out through the shell and the pole. Preferably, a metal band, preferably a nickel band, is disposed on the housing to connect the wires.

Due to the adoption of the technical scheme, the invention has the beneficial effects that:

(1) according to the invention, the insulation part extends upwards along the outer side of the substrate to form the protrusion, and the protection plate is directly fixed on the protrusion, so that the step that the protection circuit board and the lithium ion battery are required to be installed in the assembly shell together in the traditional lithium ion battery pack is avoided, and the production process is simplified; the lithium ion battery pack does not need a component shell, and can be directly pasted with labels on the outer sides of the battery shell and the protective plate to be made into a finished product, so that the miniaturization and thinning of the battery pack are realized; the manufacturing cost of a module shell in the traditional battery is avoided, and the battery cost is reduced; the problem of long development time of the module shell mold is avoided, the manufacturing period is shortened, and the requirement of updating and updating of electronic equipment can be quickly met.

(2) Through setting up location platform and location end on protruding, on the one hand can firmly be fixed in the protection shield on protruding, on the other hand the existence of location platform makes can form the space between circuit protection shield and the battery substrate after the fixing, makes the wire of connecting protection shield positive negative pole and rivet, strap on the base plate can be in free extension state, avoids the pressurized bad contact that causes.

(3) The metal belt is arranged on the shell, so that the problem of poor welding between the commonly used aluminum shell and the lead can be solved; the metal strip is preferably a nickel strip to facilitate welding with the nickel wire of the circuit protection board.

Drawings

Fig. 1 is a cross-sectional view of a lithium ion battery pack of the prior art.

Fig. 2 to 5 are sectional views illustrating an assembly process of one embodiment of the lithium ion battery pack according to the present invention.

Fig. 6 to 9 are schematic perspective views illustrating an assembly process of a lithium ion battery pack according to an embodiment of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the following detailed description and accompanying drawings.

The first embodiment is as follows:

please refer to fig. 2 to 9.

The utility model provides a lithium ion battery group, includes lithium ion battery and circuit protection board 1, and lithium ion battery includes casing 5, and the casing includes base plate 2, is provided with rivet 3 on the base plate 2 as the utmost point post of extraction electrode, is provided with insulating part 7 between base plate 2 and the rivet 3. A nickel strip 4 is also provided on the substrate 2. The positive and negative poles of the protective plate 1 are respectively connected with the rivet 3 and the nickel strap 4 on the substrate 2 through leads 10.

The insulator around the rivet 3 extends along the outside of the base plate 2 and forms two projections 8 upwardly, the projections 8 being cylindrical and provided with a positioning table 81 in the middle thereof. The position is equipped with trompil 9 with protruding corresponding on the protection shield 1, and the pitch-row of the relative one side of trompil 9 and base plate is less than the pitch-row of location platform, and the pitch-row of the relative one side of trompil and base plate then enlarges and form constant head tank 91, and protruding end passes behind the trompil 9 through the punching press form with constant head tank 91 assorted location end 82 to be fixed in the protection shield between protruding 8 location platform 81 and the location end 82, and location end 82 is flat mutually with protection shield 1 surface, does not stand out in the protection shield. The lead wire 10 is positioned in a space defined by the positioning table 81 between the protective plate 1 and the substrate 2, and is in a freely extended state, and is not pressed to cause poor contact.

The gold finger 11 is arranged on one side of the surface of the battery pack of the protection plate 1, and the battery label 12 is wrapped on the side face of the shell 5 and the protection plate of the battery pack, so that a gap between the protection plate 1 and the substrate 2 is hidden in the label.

The foregoing is a more detailed description of the present invention that is presented in conjunction with specific embodiments, and the practice of the invention is not to be considered limited to those descriptions. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.

Claims (10)

1. The utility model provides a lithium ion battery group, includes lithium ion battery and circuit protection board, and lithium ion battery includes the casing, and the casing includes the base plate, is provided with the utmost point post that is used for drawing forth the electrode on the base plate, is provided with the insulating part between base plate and the utmost point post, and the positive negative pole of protection board is connected its characterized in that with the positive negative pole electricity of lithium ion battery respectively: the insulating part at the periphery of the pole extends along the outer side of the substrate and forms at least two bulges, and the protective plate is fixedly arranged on the bulges.

2. The lithium ion battery of claim 1, wherein: the protrusion is columnar, the tail end of the protrusion is provided with a positioning end, the middle of the protrusion is provided with a positioning table, the protection plate is provided with a hole at the corresponding position of the protrusion, and the positioning end penetrates through the hole in the protection plate to fix the protection plate on the positioning table.

3. The lithium ion battery pack of claim 2, wherein: the positioning end surface is flush with the surface of the protection plate.

4. The lithium ion battery pack according to any one of claims 1 to 3, wherein: and the positive electrode and the negative electrode of the protection plate are respectively connected with the positive electrode and the negative electrode of the lithium ion battery through leads.

5. The lithium ion battery of claim 4, wherein: the positive and negative electrodes of the lithium ion battery are led out through the shell and the pole.

6. The lithium ion battery of claim 5, wherein: and a metal belt connected with the lead is arranged on the shell.

7. The lithium ion battery of claim 6, wherein: the metal belt is a nickel belt.

8. The lithium ion battery of claim 1, wherein: the positive and negative electrodes of the lithium ion battery are led out through the shell and the pole.

9. The lithium ion battery of claim 8, wherein: and a metal belt for leading out a battery electrode is arranged on the shell.

10. The lithium ion battery of claim 9, wherein: the metal belt is a nickel belt.