CN219180699U

CN219180699U - Rechargeable lithium battery device

Info

Publication number: CN219180699U
Application number: CN202320020579.2U
Authority: CN
Inventors: 王坤利; 夏涛
Original assignee: Shenzhen Dongfang Xinyuan New Energy Co ltd
Current assignee: Shenzhen Dongfang Xinyuan New Energy Co ltd
Priority date: 2023-01-05
Filing date: 2023-01-05
Publication date: 2023-06-13
Anticipated expiration: 2033-01-05

Abstract

The utility model belongs to the technical field of batteries, and provides a rechargeable lithium battery device which comprises a shell, a battery cell assembly and a circuit board assembly, wherein the circuit board assembly comprises a first circuit board positioned at the outer side and a second circuit board close to the battery cell assembly, a containing space is reserved between the first circuit board and the second circuit board, a lithium battery protection unit is electrically connected to the first circuit board, a charging unit is electrically connected to the second circuit board, the lithium battery protection unit and the charging unit are both positioned in the containing space, the lithium battery protection unit is electrically connected with the charging unit through a first conductive piece, the lithium battery protection unit is electrically connected with the positive electrode end of the battery cell assembly through a second conductive piece, and the charging unit is electrically connected with the negative electrode end of the battery cell assembly. The rechargeable lithium battery device that provides in this embodiment adopts foretell structure, omits the plastic support, adopts the polylith circuit plate structure heat dissipation fast, and charge power is fast, realizes quick charge, promotes user experience.

Description

Rechargeable lithium battery device

Technical Field

The utility model relates to the technical field of batteries, in particular to a rechargeable lithium battery device.

Background

The battery is used as an energy source, has stable and reliable performance due to stable voltage and current, is convenient to carry and simple and convenient to charge and discharge, and is widely applied to various aspects in the life of the modern society.

With the popularization and application of the fast charging technology, the common rechargeable flashlight battery with the USB interface on the market currently has the following defects: only one circuit board is arranged in the battery, the charging unit and the lithium battery protection unit are arranged on the circuit board, and the circuit board and the battery core are required to be isolated by a plastic bracket, so that the internal space of the battery is very narrow, and therefore, the selected power components are small in size, the charging power of the USB port is small, the charging time is long, and the requirements of most consumers cannot be met; and the plastic support occupies too much internal design space, so that the production and storage are not facilitated, the plastic support is not conductive, and when the power device on the circuit board works, a large amount of heat is accumulated on the small circuit board and cannot dissipate heat, and the head of the whole battery is scalded.

Disclosure of Invention

In view of the above, the present utility model provides a rechargeable lithium battery device for solving the problems of poor internal heat dissipation effect, complex structure and large space occupation of the rechargeable lithium battery in the prior art.

In order to achieve one or a part or all of the above objects or other objects, the present utility model provides a rechargeable lithium battery device, which comprises a housing, a battery cell assembly disposed in the housing, and a circuit board assembly disposed at one end of the housing and electrically connected with the battery cell assembly, wherein the circuit board assembly comprises a first circuit board disposed at the outer side and a second circuit board adjacent to the battery cell assembly, the first circuit board and the second circuit board are stacked, a receiving space is provided between the first circuit board and the second circuit board, a lithium battery protection unit is electrically connected to the first circuit board, a charging unit is electrically connected to the second circuit board, the lithium battery protection unit and the charging unit are both disposed in the receiving space, the lithium battery protection unit and the charging unit are electrically connected through a first conductive member, the lithium battery protection unit is electrically connected with the positive terminal of the battery cell assembly through a second conductive member, and the charging unit is electrically connected with the negative terminal of the battery cell assembly.

Further, the circuit board assembly further comprises a heat conducting circuit board, and the heat conducting circuit board is arranged between the second circuit board and the electric core assembly.

Further, one end face of the heat conducting circuit board is welded to the bottom face of the second circuit board, and the other end face of the heat conducting circuit board is connected with the battery cell assembly through a heat conducting film.

Further, the battery cell assembly comprises at least one battery cell and an inner shell for wrapping the battery cell, the positive electrode end of the battery cell protrudes from the center of the end part of the inner shell, the negative electrode end of the battery cell assembly is led out from the wall of the inner shell, the heat conducting circuit board is arranged around the positive electrode end, and the height of the heat conducting circuit board is higher than that of the positive electrode end.

Further, the battery cell assembly further comprises a positive electrode nickel strap, one end of the positive electrode nickel strap is welded with the positive electrode end of the battery cell assembly, and the other end of the positive electrode nickel strap is welded with the second conductive piece.

Further, the battery cell assembly further comprises a negative nickel strap, one end of the negative nickel strap is electrically connected with the negative end of the battery cell assembly, and the other end of the negative nickel strap is electrically connected with the charging unit.

Further, the charging unit comprises a charging positive electrode interface exposed by the shell and a charging negative electrode end, and the negative electrode nickel strap is electrically connected with the charging negative electrode end.

Further, the first conductive member and the second conductive member are conductive pillars.

Further, an electric quantity detection chip is arranged on the first circuit board, and a shaking switch and an electric quantity indicator lamp which are electrically connected with the electric quantity detection chip are arranged on the end face, facing the outer side, of the first circuit board.

Further, the electric quantity indicating lamps are multiple, the electric quantity indicating lamps are arranged side by side, and indication windows capable of being used for emitting the electric quantity indicating lamps are arranged on the end face of the shell.

The implementation of the embodiment of the utility model has the following beneficial effects:

according to the rechargeable lithium battery device provided by the utility model, the two circuit boards are arranged, and the charging unit and the lithium battery protection unit are independently arranged on different circuit boards, so that heat accumulation is reduced, the heat dissipation pressure of each circuit board is reduced, and the heat dissipation effect is better; in addition, the two circuit boards are stacked to form a containing space for placing the charging unit and the lithium battery protection unit, so that the plastic bracket is omitted, and the internal space is saved, and therefore, components with higher power can be selected, and the charging efficiency is greatly improved.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Wherein:

fig. 1 is a schematic structural view of a rechargeable lithium battery device according to an embodiment of the present utility model;

fig. 2 is an exploded side view of a rechargeable lithium battery device in an embodiment of the present utility model;

fig. 3 is an exploded view of a rechargeable lithium battery device according to an embodiment of the present utility model;

reference numerals:

10-a housing; 11-an indication window; 20-cell assembly; 21-an inner shell; 22-positive terminal; 23-negative side; 24-positive nickel strap; 25-negative electrode nickel strips; 30-a circuit board assembly; 31-a first circuit board; 32-a second circuit board; 33-lithium battery protection unit; a 34-charging unit; 341-a charging positive electrode interface; 342-a charge negative terminal; 35-accommodating space; 36-a thermally conductive circuit board; 37-a heat conducting film; 38-a first conductive member; 39-a second conductive member.

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 utility model belongs; the terminology used in the description of the applications herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model; the terms "comprising" and "having" and any variations thereof in the description of the utility model and the claims and the description of the drawings above are intended to cover a non-exclusive inclusion. The terms first, second and the like in the description and in the claims or in the above-described figures, are used for distinguishing between different objects and not necessarily for describing a sequential or chronological order.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the utility model. The appearances of such phrases 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. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.

In order to make the person skilled in the art better understand the solution of the present utility model, the technical solution of the embodiment of the present utility model will be clearly and completely described below with reference to the accompanying drawings.

Referring to fig. 1 to 3, the rechargeable lithium battery device provided by the present utility model has a slim shape as a whole, and is compact and portable. The battery pack comprises a shell 10, a battery cell assembly 20 arranged in the shell 10, and a circuit board assembly 30 arranged at one end of the shell 10 and electrically connected with the battery cell assembly 20. The circuit board assembly 30 is disposed on one side of the battery cell assembly 20 for charging and discharging the battery. The circuit board assembly 30 includes a first circuit board 31 and a second circuit board 32, which are stacked, wherein the first circuit board 31 is located on the outer side, i.e. far from the cell assembly 20, and the second circuit board 32 is located on the inner side, i.e. near the cell assembly 20. The first circuit board 31 and the second circuit board 32 are provided with a containing space, the first circuit board 31 is electrically connected with the lithium battery protection unit 33, the second circuit board 32 is electrically connected with the charging unit 34, the lithium battery protection unit 33 and the charging unit 34 are both positioned in the containing space 35, the lithium battery protection unit 33 and the charging unit 34 are electrically connected through the first conductive piece 38, the lithium battery protection unit 33 is electrically connected with the positive end of the battery cell assembly 20 through the second conductive piece 39, and the charging unit 34 is electrically connected with the negative end of the battery cell assembly 20.

In the utility model, two circuit boards are arranged, and the charging unit 34 and the lithium battery protection unit 33 are independently arranged on different circuit boards, so that heat accumulation is reduced, heat dissipation pressure of each circuit board is reduced, and heat dissipation effect is better; in addition, the two circuit boards are stacked to form the accommodating space 35 for accommodating the charging unit 34 and the lithium battery protection unit 33, so that a plastic bracket is omitted, and the internal space is saved, and therefore, components with higher power can be selected, and the charging efficiency is greatly improved.

Further, referring to fig. 3, in the rechargeable lithium battery device provided in the present embodiment, the circuit board assembly 30 further includes a heat conductive circuit board 36, and the heat conductive circuit board 36 is disposed between the second circuit board 32 and the battery cell assembly 20. Because the second circuit board 32 is provided with the charging unit 34, a large amount of heat is generated in the charging and discharging process, and the heat on the second circuit board 32 can be quickly conducted to the battery cell assembly 20 through the heat conducting circuit board 36, and the battery cell assembly 20 has a large area, so that the heat can be radiated more quickly.

Specifically, one end surface of the heat conducting circuit board 36 is welded to the bottom surface of the second circuit board 32, and the other end surface of the heat conducting circuit board 36 is connected to the electric core assembly 20 through a heat conducting film 37. The heat conducting film 37 is used for connecting the heat conducting circuit board 36 with the battery cell assembly 20, so that the heat conducting effect is better.

In this embodiment, the battery cell assembly 20 includes at least one battery cell (not shown) and an inner housing 21 for enclosing the battery cell. Preferably, at least two of the cells in the inner housing 21 are connected in parallel or in series. The number of the battery cells can be increased or decreased according to actual needs, and can be one, two or more. When the number of the electric cores is multiple, the electric cores can be connected in parallel or in series, and the electric cores are led out through the positive electrode terminal and the negative electrode terminal after being connected in parallel or in series through nickel belts. Specifically, the positive terminal 22 of the battery cell assembly 20 protrudes from the center of the end of the inner casing 21, the negative terminal 23 of the battery cell assembly 20 is led out from the wall of the inner casing 21, the heat conducting circuit board 36 has a C-shaped structure, and is disposed around the positive terminal 22, and the height of the heat conducting circuit board 36 is higher than that of the positive terminal 22. Because the height of the heat conducting circuit board 36 is higher than that of the positive electrode end 22, when the battery falls, even if the battery head falls downwards, the heat conducting circuit board 36 can protect the positive electrode end 22 and protect the positive electrode end 22 from being stressed, and the heat conducting circuit board 36 is stressed, so that the internal battery core is better protected.

Further, in the present embodiment, when the positive electrode terminal 22 and the negative electrode terminal 23 of the battery cell assembly 20 are electrically connected to the outside, they are led out through the nickel strap. Specifically, the battery cell assembly 20 includes a positive nickel strap 24 and a negative nickel strap 25, one end of the positive nickel strap 24 is welded to the positive terminal 22 of the battery cell assembly 20, and the other end of the positive nickel strap 24 is welded to the second conductive member 39 after being bent. One end of the negative nickel strap 25 is electrically connected to the negative terminal 23 of the cell assembly 20, and the other end of the negative nickel strap 25 is electrically connected to the charging unit 34. In this way, the positive electrode terminal 22 and the negative electrode terminal 23 of the battery cell assembly 20 are electrically connected to the charging unit 34 through the nickel strap and the second conductive member 39, respectively, and since the charging unit 34 is electrically connected to the lithium battery protection unit 33 through the first conductive member 38, the lithium battery protection unit 33 is electrically connected to the second conductive member 39, so that the battery cell assembly 20 forms a circulation loop with the lithium battery protection unit 33 and the charging unit 34 for charging and discharging.

Specifically, in the present embodiment, the charging unit 34 includes a charging positive electrode interface 341 exposed by the housing 10 for communicating with an external charging interface, and a charging negative electrode terminal 342, and the negative nickel strap 25 is electrically connected to the charging negative electrode terminal 342 after being bent.

Preferably, in the present embodiment, the first conductive element 38 and the second conductive element 39 are conductive pillars. The arrangement of the two conductive struts not only plays a role in electric connection, but also plays a role in supporting the first circuit board 31 and the second circuit board 32, so that a stable accommodating space 35 is formed between the first circuit board 31 and the second circuit board 32.

Referring to fig. 3, in the present embodiment, an electric quantity detecting chip (not shown in the drawings) is disposed on the first circuit board 31, and a sway switch (not numbered in the drawings) and an electric quantity indicator 311 electrically connected to the electric quantity detecting chip are disposed on an end surface of the first circuit board 31 facing the outside. When the electric quantity is required to be displayed, the user only needs to shake the battery, the electric quantity detection chip detects a signal of the shake switch, electric quantity detection is carried out, and electric quantity indication is carried out through the electric quantity indicator 311. The quantity of electricity pilot lamp 311 is a plurality of, and a plurality of quantity of electricity pilot lamps 311 set up side by side, is equipped with the instruction window 11 that can supply a plurality of quantity of electricity pilot lamps to launch on the terminal surface of shell 10. Thus, the number of the power indicator lamps 311 can be seen through the indication window 11, and the current power is indicated. Such as when the charge indicator 311 is 4, each 1 lamp represents 25% of the charge, and so on.

In this embodiment, the charging loop of the rechargeable lithium battery device is: charging positive electrode interface 341, charging unit 34, first conductive piece 38, lithium battery protection unit 33, second conductive piece 39, positive electrode nickel strap 24, battery cell positive electrode, battery cell negative electrode, negative electrode nickel strap 25 and charging negative electrode terminal 23. The discharge loop is as follows: the battery cell positive electrode end 22, the positive electrode nickel strap 24, the second conductive piece 39, the lithium battery protection unit 33, the load and the negative electrode end 23 of the battery cell.

In summary, the rechargeable lithium battery device provided in this embodiment adopts the above-mentioned structure, omits the plastic support, adopts the heat dissipation of polylith circuit board structure fast, and charge power is fast, realizes quick charge, promotes user experience.

It is apparent that the above-described embodiments are only some embodiments of the present utility model, but not all embodiments, and the preferred embodiments of the present utility model are shown in the drawings, which do not limit the scope of the patent claims. This utility model may be embodied in many different forms, but rather, embodiments are provided in order to provide a thorough and complete understanding of the present disclosure. Although the utility model has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing description, or equivalents may be substituted for elements thereof. All equivalent structures made by the content of the specification and the drawings of the utility model are directly or indirectly applied to other related technical fields, and are also within the scope of the utility model.

Claims

1. The utility model provides a chargeable lithium battery device, includes the shell, set up in the electric core subassembly in the shell, and locate shell one end and with the circuit board subassembly that electric core subassembly is connected, its characterized in that, the circuit board subassembly is including being located the first circuit board in the outside and being close to the second circuit board of electric core subassembly, first circuit board with the second circuit board superposes, and has the accommodation space between the two, the electricity is connected with lithium cell protection unit on the first circuit board, the electricity is connected with the charging unit on the second circuit board, lithium cell protection unit with the charging unit all is located in the accommodation space, just lithium cell protection unit with be connected through first conducting piece electricity between the charging unit, lithium cell protection unit is connected through the second conducting piece electricity the positive terminal of electric core subassembly, the charging unit is connected electrically the negative terminal of electric core subassembly.

2. The rechargeable lithium battery device of claim 1, wherein the circuit board assembly further comprises a thermally conductive circuit board disposed between the second circuit board and the electrical core assembly.

3. The rechargeable lithium battery device of claim 2, wherein one end surface of the heat conducting circuit board is welded to the bottom surface of the second circuit board, and the other end surface of the heat conducting circuit board is connected to the electric core assembly through a heat conducting film.

4. A rechargeable lithium battery device according to claim 2 or 3, wherein said cell assembly comprises at least one cell and an inner casing for enclosing said cell, a positive end of said cell protruding from an end center of said inner casing, a negative end of said cell assembly being led out from said inner casing wall, said heat conducting circuit board being arranged around said positive end, and a height of said heat conducting circuit board being higher than a height of said positive end.

5. The rechargeable lithium battery device of claim 4, wherein the cell assembly further comprises a positive nickel strap, one end of the positive nickel strap being welded to the positive end of the cell assembly, the other end of the positive nickel strap being welded to the second conductive member.

6. The rechargeable lithium battery device of claim 4, wherein the cell assembly further comprises a negative nickel strap, one end of the negative nickel strap being electrically connected to a negative end of the cell assembly, the other end of the negative nickel strap being electrically connected to the charging unit.

7. The rechargeable lithium battery device of claim 6, wherein said charging unit comprises a charging positive electrode interface exposed by said housing, and a charging negative electrode terminal, said negative nickel strap being electrically connected to said charging negative electrode terminal.

8. The rechargeable lithium battery device of claim 1, wherein: the first conductive member and the second conductive member are conductive struts.

9. The rechargeable lithium battery device of claim 1, wherein: the electric quantity detection device is characterized in that an electric quantity detection chip is arranged on the first circuit board, and a shaking switch and an electric quantity indicator lamp which are electrically connected with the electric quantity detection chip are arranged on the end face, facing the outer side, of the first circuit board.

10. The rechargeable lithium battery device of claim 9, wherein: the electric quantity indicating lamps are multiple, the electric quantity indicating lamps are arranged side by side, and indication windows capable of being used for the electric quantity indicating lamps to emit are arranged on the end face of the shell.