CN218602525U

CN218602525U - Lithium ion battery

Info

Publication number: CN218602525U
Application number: CN202222949948.4U
Authority: CN
Inventors: 潘玉华; 肖颖
Original assignee: Zhejiang Sunwoda Electronics Co Ltd
Current assignee: Zhejiang Sunwoda Electronics Co Ltd
Priority date: 2022-11-03
Filing date: 2022-11-03
Publication date: 2023-03-10
Anticipated expiration: 2032-11-03

Abstract

The utility model relates to a lithium ion battery, which comprises an electric core and a battery protection plate component, wherein the electric core is provided with a pole ear; the battery protection plate assembly comprises a substrate, electronic components and connectors, wherein the substrate comprises a hard plate and a plurality of groups of soft plates in press fit connection with the substrate, the soft plates extend out of the hard plate, and the plurality of groups of soft plates are respectively connected with the connectors and lugs; the electronic component is arranged on the hard board. The base plate of the battery protection plate component is formed by pressing the hard plate and the soft plate, the lug connecting part is arranged on the soft plate, the contact area of the lug and the battery protection plate is increased, the hard plate cloth space is released, the effects of reducing the internal resistance of the battery and reducing the width of the hard plate are achieved, and therefore the energy loss of the battery is reduced.

Description

Lithium ion battery

Technical Field

The utility model relates to the technical field of batteries, especially, relate to a lithium ion battery.

Background

Currently, lithium ion batteries have become the power source of choice for consumer portable electronic products. The battery protection board on the lithium ion battery is used as an integrated circuit board for preventing the problems of overcharge, overdischarge, short circuit and the like in the battery, and comprises a substrate, and electronic components, a connector and a nickel sheet which are arranged on the substrate. The connector is used for buckling with equipment to be powered and is generally arranged at two ends of the battery protection board.

The nickel sheet is used for connecting with the battery core and is generally attached to one surface of the battery protection plate, so the area of the nickel sheet is generally larger. The nickel sheet has larger area, thereby greatly occupying the area of the protective plate for placing electronic components, not only limiting the width of the battery tab, but also limiting the plate width of the protective plate, and the battery has the problems of large internal resistance and high energy loss.

Disclosure of Invention

To the problem among the above-mentioned prior art, the utility model aims at providing a lithium ion battery, its battery protection board subassembly's base plate is formed by hardboard and soft board pressfitting, sets up utmost point ear connecting portion on the soft board, has increased utmost point ear and battery protection board area of contact, has released hardboard cloth piece space simultaneously, has realized reducing the battery internal resistance, has reduced the wide effect of hardboard to reduce battery energy loss.

In order to achieve the purpose, the utility model adopts the following technical proposal:

a lithium ion battery comprising:

the battery cell is provided with a lug;

the battery protection board assembly comprises a substrate, electronic components and connectors, wherein the substrate comprises a hard board and a plurality of groups of soft boards in press fit connection with the substrate, the soft boards extend out of the hard board, and the plurality of groups of soft boards are respectively connected with the connectors and the lugs; the electronic component is arranged on the hard board.

Preferably, the flexible boards include a first flexible board, a second flexible board, a third flexible board and a fourth flexible board, the first flexible board and the second flexible board are respectively located at the left side and the right side of the hard board, and the extended end regions of the first flexible board and the second flexible board are respectively attached with the connectors; the third soft plate and the fourth soft plate are positioned at the side edge position of the hard plate in the length direction, and the extending end areas of the third soft plate and the fourth soft plate are respectively connected with the two pole lugs.

Preferably, the third flexible board and the fourth flexible board are both provided with a pad, and the third flexible board and the fourth flexible board are connected with the tab through the pad.

Preferably, the first soft board and the second soft board are both L-shaped, one end of the L-shape is connected with the hard board in a pressing manner, and the other end of the L-shape is attached with the connector.

Preferably, the electronic component is attached to one side or both sides of the hard board.

Preferably, the soft board is combined with the hard board, and the soft board is clamped in the hard board.

Preferably, the hard board is sequentially provided with a first hard board ink layer, a first hard board copper plating layer, a first hard board base material, a first hard board semi-cured sheet layer, a second hard board copper plating layer, a central base material, a third hard board copper plating layer, a second hard board semi-cured sheet layer, a second hard board base material, a fourth hard board copper plating layer and a second hard board ink layer.

Preferably, the hard board second copper plating layer, the central substrate and the hard board third copper plating layer extend out of the hard board as a part of the flexible board, the soft board first cover film is arranged on the hard board second copper plating layer, and the soft board second cover film is arranged on the hard board third copper plating layer, so that the flexible board is formed by the above composition structure.

Preferably, the part of the first cover film of the flexible printed circuit board is in press fit connection with the first prepreg layer of the hard printed circuit board, and the part of the second cover film of the flexible printed circuit board is in press fit connection with the second prepreg layer of the hard printed circuit board.

The utility model discloses owing to take above technical scheme, it has following advantage:

1. the utility model provides a lithium ion battery, its battery protection board subassembly's base plate is formed by hardboard and soft board pressfitting, has cancelled the nickel piece on the hardboard, has released the regional space of hardboard, further reduces the board width of battery protection board subassembly base plate, has increased electric core size, and then has increased battery capacity.

2. The utility model provides a lithium ion battery, utmost point ear are connected with the soft board, do not occupy the hardboard space, have widened the size of utmost point ear, have increased utmost point ear and soft board area of contact, have reduced the internal resistance to reduce battery energy loss and temperature rise.

Drawings

Fig. 1 is a schematic structural diagram of a lithium ion battery provided by an embodiment of the present invention.

Fig. 2 is a schematic view of the connection structure of the hard board, the soft board and the combination portion provided in the embodiment of the present invention.

In the drawings, the reference numbers:

1 is electric core, 101 is the utmost point ear, 2 is electronic components, 3 is the connector, 4 is the hardboard, 401 is the first printing ink layer of hardboard, 402 is the first copper layer of hardboard, 403 is the first substrate of hardboard, 404 is the first semi-solid lamella of hardboard, 405 is the second copper layer of hardboard, 406 is central substrate, 407 is the third copper layer of hardboard, 408 is the second semi-solid lamella of hardboard, 409 is the second substrate of hardboard, 410 is the fourth copper layer of hardboard, 411 is the second printing ink layer of hardboard, 5 is first soft board, 6 is the second soft board, 7 is the third soft board, 8 is the fourth soft board, 901 is first cover film, 902 is the second cover film.

Detailed Description

To make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. It is to be understood that the embodiments described are only some of the embodiments of the present invention, and not all of them. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "rear", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the system or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "assembled", "disposed" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The utility model provides a pair of lithium ion battery, its battery protection board subassembly's base plate is formed by hardboard and soft board pressfitting, sets up utmost point ear connecting portion on the soft board, has increased utmost point ear and battery protection board area of contact, has released hardboard cloth spare space simultaneously, has realized reducing the battery internal resistance, has reduced the wide effect of hardboard, has reduced battery energy loss.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Examples

As shown in fig. 1, the lithium ion battery provided in this embodiment includes a battery cell 1 and a battery protection board assembly, where a tab 101 is disposed on the battery cell 1;

the battery protection board assembly comprises a substrate, an electronic component 2 and a connector 3, wherein the substrate is composed of a hard board 4 and a plurality of groups of soft boards which are connected with the substrate in a pressing mode, and the substrate forms a soft and hard combined board; the soft plates extend out of the hard plate, and the multiple groups of soft plates are respectively connected with the connector 3 and the tab 101; the electronic component 2 is disposed on the hard sheet 4.

In this embodiment, the soft boards include a first soft board 5, a second soft board 6, a third soft board 7 and a fourth soft board 8, and the first soft board 5 and the second soft board 6 are respectively located at the left and right sides of the hard board 4 and extend out from the left and right ends of the hard board 4; the connector 3 is respectively attached to the extending end regions of the first soft board 5 and the second soft board 6, the soft boards can be bent, and after the first soft board 5 and the second soft board 6 are bent, the connector 3 is buckled with the equipment to be powered; the third soft plate 7 and the fourth soft plate 8 are positioned at the side positions of the hard plate 4 in the length direction thereof and extend from the side positions of the hard plate 4, and the end regions extending therefrom are connected with two tabs 101, respectively.

The third soft plate 7 and the fourth soft plate 8 are both provided with a bonding pad and are connected with the lug 101 through the bonding pad; in a specific application, the bonding pad and the tab 101 are connected by electric welding.

Because the soft board has the characteristics that can bend, after third soft board 7 and the fourth soft board 8 in the battery protection board subassembly are buckled, the battery protection board subassembly can pile up and place the top at electric core 1.

In the embodiment, the first soft board 5 and the second soft board 6 are both L-shaped, one end of the L-shaped is in press fit connection with the hard board 4, the connector 3 is attached to the other end of the L-shaped, and the L-shaped structure is convenient to install and connect with external equipment to be powered.

In this embodiment, the electronic component 2 is attached to one or both sides of the hard board 4, and specifically may be located in the middle area of the hard board 4, and the electronic component 2 is connected to the tab 101 and the connector 3 through the hard board 4 and the soft board, and since the nickel sheet on the hard board 4 is eliminated, the space in the hard board area is released, and the placement area of the electronic component 2 on the hard board is enlarged.

In this embodiment, as shown in fig. 2, the soft board is clamped in the hard board 4 at the joint of the soft board and the hard board 4, so that the connection is firmer; the hard board 4 is sequentially provided with a hard board first ink layer 401, a hard board first copper plating layer 402, a hard board first base material 403, a hard board first semi-cured layer 404, a hard board second copper plating layer 405, a central base material 406, a hard board third copper plating layer 407, a hard board second semi-cured layer 408, a hard board second base material 409, a hard board fourth copper plating layer 410 and a hard board second ink layer 411, and the central base material 406 is a central layer.

The portions of the hard board second copper plating layer 405, the center base material 406, and the hard board third copper plating layer 407 extend from the hard board 4 as a part of the flexible board, and the flexible board first cover film 901 is provided on the hard board second copper plating layer 405, and the flexible board second cover film 902 is provided on the hard board third copper plating layer 407, thereby forming the flexible board.

At the joint of the flexible board and the hard board 4, the first flexible board cover 901 is in press fit connection with the first hard board prepreg layer 404, and the second flexible board cover 902 is in press fit connection with the second hard board prepreg layer 408. The first cover film 901 and the second cover film 902 for the flexible printed circuit board each include a PI (polyimide resin film) layer and an AD (epoxy glue) layer, and the AD layers are respectively attached to the portions of the second copper plating layer 405 and the third copper plating layer 407 of the rigid printed circuit board extending from the rigid printed circuit board 4.

The first substrate 403 of the hard board comprises an L1 Cu (L1 copper foil) layer and a first FR4 layer (glass fiber substrate), the L1 Cu layer is attached to the first copper plating layer 402 of the hard board, and the FR4 layer is attached to the first semi-cured sheet layer 404 of the hard board;

the central substrate 406 is sequentially provided with an L2 CU (L2 copper foil) layer, a PI (polyimide resin film) layer, and an L3 CU (L3 copper foil) layer, and the L2 CU layer is attached to the third copper plating layer 407 of the hard board;

the second substrate 409 of the hard board comprises an L4 Cu (L4 copper foil) layer and a second FR4 (glass fiber substrate) layer, and the L4 Cu layer is attached to the fourth copper plating layer 410 of the hard board.

According to the lithium ion battery provided by the embodiment, the nickel sheet on the hard board 4 is eliminated, so that the area space of the hard board 4 is released, the board width of the battery protection board assembly substrate is further reduced, the size of the battery core 1 is increased, and the battery capacity is further increased. Meanwhile, the tab 101 is connected with the soft plate, so that the hard plate space is not occupied, the size of the tab 101 can be widened, the contact area is increased, and the internal resistance is reduced, thereby reducing the energy loss and the temperature rise of the battery.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims

1. A lithium ion battery, comprising:

the battery cell is provided with a lug;

2. The lithium ion battery of claim 1, wherein the flexible boards comprise a first flexible board, a second flexible board, a third flexible board and a fourth flexible board, the first flexible board and the second flexible board are respectively located at the left side and the right side of the hard board, and the extended end regions of the first flexible board and the second flexible board are respectively attached with the connectors; the third soft plate and the fourth soft plate are positioned at the side edge position of the hard plate in the length direction, and the extending end regions of the third soft plate and the fourth soft plate are respectively connected with the two pole lugs.

3. The lithium ion battery of claim 2, wherein a bonding pad is disposed on each of the third flexible board and the fourth flexible board, and the bonding pads are connected to the tabs.

4. The lithium ion battery of claim 2, wherein the first flexible board and the second flexible board are both L-shaped, one end of the L-shape is connected with the hard board in a pressing manner, and the other end of the L-shape is attached with the connector.

5. The lithium ion battery of claim 1, wherein the electronic component is attached to one or both sides of the hard sheet.

6. The li-ion battery of claim 1, wherein the soft plate is sandwiched between the hard plate where the soft plate is bonded to the hard plate.

7. The lithium ion battery according to claim 1, wherein the hard board is sequentially provided with a hard board first ink layer, a hard board first copper plating layer, a hard board first base material, a hard board first semi-cured sheet layer, a hard board second copper plating layer, a center base material, a hard board third copper plating layer, a hard board second semi-cured sheet layer, a hard board second base material, a hard board fourth copper plating layer and a hard board second ink layer.

8. The lithium ion battery of claim 7, wherein portions of the rigid second copper plating layer, the central substrate, and the rigid third copper plating layer extend from the rigid board as a portion of the flexible board, the rigid second copper plating layer having the flexible board first cover film disposed thereon, and the rigid third copper plating layer having the flexible board second cover film disposed thereon, the above composition constituting the flexible board.

9. The lithium ion battery of claim 8, wherein a portion of the first cover film of the flexible board is in press fit connection with the first prepreg layer of the hard board, and a portion of the second cover film of the flexible board is in press fit connection with the second prepreg layer of the hard board.