CN111081914A - Lithium battery - Google Patents
Lithium battery Download PDFInfo
- Publication number
- CN111081914A CN111081914A CN201911211768.2A CN201911211768A CN111081914A CN 111081914 A CN111081914 A CN 111081914A CN 201911211768 A CN201911211768 A CN 201911211768A CN 111081914 A CN111081914 A CN 111081914A
- Authority
- CN
- China
- Prior art keywords
- circuit board
- lithium battery
- flexible circuit
- battery cell
- battery
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 35
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 35
- 238000002347 injection Methods 0.000 claims abstract description 30
- 239000007924 injection Substances 0.000 claims abstract description 30
- 239000003292 glue Substances 0.000 claims abstract description 15
- 239000000084 colloidal system Substances 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 15
- 238000012858 packaging process Methods 0.000 abstract description 4
- 238000000465 moulding Methods 0.000 description 35
- SZUVGFMDDVSKSI-WIFOCOSTSA-N (1s,2s,3s,5r)-1-(carboxymethyl)-3,5-bis[(4-phenoxyphenyl)methyl-propylcarbamoyl]cyclopentane-1,2-dicarboxylic acid Chemical compound O=C([C@@H]1[C@@H]([C@](CC(O)=O)([C@H](C(=O)N(CCC)CC=2C=CC(OC=3C=CC=CC=3)=CC=2)C1)C(O)=O)C(O)=O)N(CCC)CC(C=C1)=CC=C1OC1=CC=CC=C1 SZUVGFMDDVSKSI-WIFOCOSTSA-N 0.000 description 31
- 229940126543 compound 14 Drugs 0.000 description 31
- 238000005452 bending Methods 0.000 description 9
- 238000003466 welding Methods 0.000 description 6
- 150000001875 compounds Chemical class 0.000 description 5
- 239000008393 encapsulating agent Substances 0.000 description 4
- 238000001746 injection moulding Methods 0.000 description 3
- 238000004806 packaging method and process Methods 0.000 description 3
- 238000005476 soldering Methods 0.000 description 3
- 238000004382 potting Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/172—Arrangements of electric connectors penetrating the casing
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Battery Mounting, Suspending (AREA)
Abstract
The invention discloses a lithium battery, which comprises a battery cell, a battery cell lug extending from the end part of the battery cell, a printed circuit board connected with the battery cell lug, a flexible circuit board connected with the printed circuit board, and a glue injection body used for encapsulating the battery cell lug, the printed circuit board and the flexible circuit board; the injection colloid is provided with at least one concave part, the first connecting end of the flexible circuit board is connected with the printed circuit board, and the second connecting end of the flexible circuit board passes through the concave part and protrudes out of the injection colloid. The lithium battery has a simple structure, simplifies the packaging process, improves the production efficiency, finally reduces the production cost, and is suitable for wide popularization and application.
Description
Technical Field
The invention relates to the field of lithium batteries, in particular to a structure and a package of a lithium battery.
Background
With the application and popularization of various high-end portable electronic devices, the requirements of people on the capacity, safety performance and humanization of a battery are continuously improved, and the existing lithium battery packaging method usually adopts low-pressure injection molding packaging.
A common method for encapsulating a lithium battery includes welding a Printed Circuit Board (PCB) and a flexible printed circuit board (FPC), welding the PCB and the FPC to a battery cell tab, and encapsulating the PCB, the FPC, and the battery cell tab together by using a specific mold. Specifically, one end of the FPC is packaged after being connected with the PCB, and the other end of the FPC is a protruding end which directly protrudes out of the battery cell and is connected with an external electronic product. However, since the types and models of electronic products are numerous, the positions of the welding points on the electronic products connected with the lithium battery are different, and particularly, two FPCs are used for reducing heat generation of the quick-charging battery, so that the shape arrangement and the wiring of the FPCs need to be changed according to different electronic products in order to adapt to different welding positions of electronic products of different types and different models. Naturally, the specific mold for packaging also needs to be modified in conformity with the FPC. Often, the number of different FPCs that a manufacturer of a lithium battery needs to be equipped with is hundreds, which results in that the manufacturer needs to design hundreds of different molds to be matched and packaged with the different FPCs, so that the cost is very high, and the manufacturing and enterprise benefits are not favorable.
Therefore, it is desirable to provide a lithium battery with simple structure, simple injection molding, simplified process, and low production cost, so as to overcome the above drawbacks.
Disclosure of Invention
The invention aims to provide an improved lithium battery which is simple in structure, simplifies the packaging process, improves the production efficiency and finally reduces the production cost.
In order to achieve the above object, the lithium battery provided by the present invention includes a battery cell, a battery cell tab extending from an end of the battery cell, a printed circuit board connected to the battery cell tab, a flexible circuit board connected to the printed circuit board, and a glue injection body for encapsulating the battery cell tab, the printed circuit board, and the flexible circuit board; the injection colloid is provided with at least one concave part, the first connecting end of the flexible circuit board is connected with the printed circuit board, and the second connecting end of the flexible circuit board passes through the concave part and protrudes out of the injection colloid.
The concave part is arranged on the glue injection body of the lithium battery, so that the FPC with welding ends at different positions can penetrate out, and therefore the shape of the injection mold corresponding to the glue injection body does not need to be configured with each FPC one to one, so that the manufacturing process is simplified, the working efficiency is improved, and the production and manufacturing cost is finally reduced.
Preferably, the flexible circuit board includes a first layer having the first connection end, a second layer having the second connection end and forming a height difference with the first layer, and a bending portion connecting the first layer and the second layer, the first layer is at least partially encapsulated by the glue injection body, and the bending portion and the second layer protrude outward from the concave portion.
Preferably, the bent portion of the flexible circuit board is accommodated in the recess.
Preferably, the concave part is a step, and the step is arranged at one end of the injection colloid.
Preferably, the concave part is a groove, and the groove is arranged at one end of the injection colloid.
Preferably, the encapsulant has a first surface parallel to the upper surface of the battery cell and a second surface attached to the deep pit surface of the battery cell.
Preferably, the second connecting end of the flexible circuit board is higher than the first surface of the injection colloid.
Preferably, the recess is opened on the first surface and/or the second surface.
Preferably, the second layer and the second connecting end are connected in an L shape.
Preferably, the flexible circuit board is flat along the length or width direction of the battery core.
Preferably, the flexible circuit board is bent along the deep pit surface of the battery cell and extends out along the tail end of the battery cell.
Preferably, the flexible circuit board is bent along the upper surface of the gel injection body and extends out along the front end of the battery core.
Drawings
Fig. 1 is a perspective view of a first embodiment of a lithium battery of the present invention.
Fig. 2 is a partially enlarged view of fig. 1.
Fig. 3 is an exploded view of fig. 1.
Fig. 4a-4b are enlarged views of the detail elements of fig. 3.
Fig. 5 is a perspective view of a second embodiment of a lithium battery of the present invention.
Fig. 6 is a partially enlarged view of fig. 5.
Fig. 7 is an exploded view of fig. 5.
Fig. 8a-8b are enlarged views of a detail of fig. 7.
Fig. 9 is a perspective view of a third embodiment of a lithium battery of the present invention.
Fig. 10 is a partially enlarged view of fig. 9.
Fig. 11 is an exploded view of fig. 9.
Fig. 12a-12b are enlarged views of a portion of the elements of fig. 11.
Fig. 13 is a perspective view of a fourth embodiment of a lithium battery of the present invention.
Fig. 14 is a partially enlarged view of fig. 13.
Fig. 15 is an exploded view of fig. 13.
Fig. 16a-16c are enlarged views of a detail of fig. 15.
Fig. 17 is a perspective view of a fifth embodiment of a lithium battery of the present invention.
Fig. 18a-18b are enlarged views of a portion of fig. 17.
Fig. 19 is an exploded view of fig. 17.
Fig. 20 is an enlarged view of a portion of the elements of fig. 19.
Detailed Description
In order to explain technical contents, structural features, and effects achieved by the present invention in detail, the following detailed description is given with reference to the embodiments and the accompanying drawings.
As shown in fig. 1 to 3, a lithium battery 1 of the present invention includes a battery cell 10, a cell tab 11, a Printed Circuit Board (PCB)12, a flexible circuit board (FPC)13, and an encapsulant 14. The battery core tab 11 extends from the end of the battery core and is located at the bottom of the pit surface 11a of the battery core 11, the PCB12 is connected with the battery core tab 11, and the potting compound 14 is located on one side of the pit surface 10a of the battery core 10 to encapsulate the PCB12, the battery core tab 11 and the FPC 13. The molding compound 14 is provided with a concave portion 141a (see fig. 4a), the first connection terminal 13a (see fig. 4b) of the FPC13 is connected with the PCB12, and the second connection terminal 13b of the FPC13 passes through the concave portion 141a of the molding compound 14 and protrudes out of the molding compound 14 to be connected with an external electronic product (not shown).
Since the concave portion 141a is formed on the molding compound 14 of the lithium battery 1 of the present invention for the FPC13 having the soldering terminal at various positions to pass through, the shape of the injection mold corresponding to the molding compound 14 does not need to be set one-to-one with each FPC, thereby simplifying the manufacturing process, improving the working efficiency, and finally reducing the manufacturing cost.
Specifically, in the first embodiment, the concave portion 141a of the molding compound 14 is stepped and is disposed at an end of the molding compound 14, as shown in fig. 4a, the molding compound 14 has a first surface 14a parallel to the upper surface of the battery cell 10, a second surface (not labeled) attached to the pit surface 10a of the battery cell 10, and an outer side surface 14c opposite to the second surface. The stepped recess 141a is opened on the first surface 14a, and the second connection terminal 13b of the FPC13 passes through the recess 141a to protrude outside the encapsulant 14.
As shown in fig. 4b, the FPC13 in this embodiment includes a first layer 131 having a first connection end 13a, a second layer 132 having a second connection end 13b and forming a height difference with the first layer 131, and a bending portion 133 connecting the first layer 131 and the second layer 132, the first layer 131 is at least partially encapsulated by the molding compound 14, and the bending portion 133 and the second layer 132 protrude from the recess 141. In this embodiment, the first layer 131 is I-shaped, and the second layer 132 is L-shaped and located on the first layer 131, that is, the second layer 132 and the second connection end are L-shaped. Specifically, the first layer 131 is at least partially encapsulated in the molding compound 14, the bending portion 133 is accommodated in the recess 141a, as shown in the figure, more specifically, the partial first layer 131 and the bending portion 133 extend out from the molding compound 14 and are located in the recess 141a without contacting the recess 141a, and the second layer 132 and the second connecting end of the FPC13 are located above the first surface 14a of the molding compound 14, as shown in fig. 2.
As a second embodiment, as shown in fig. 5 to 8b, the recess 141b of the potting body 14 is provided in a groove shape, unlike the first embodiment. Specifically, as shown in fig. 8a, the groove 141b is opened at the junction of the first surface 14a and the outer side surface 14c of the molding compound 14, the groove 141b serves as an outlet of the FPC13, the bending portion 133 of the FPC13 is accommodated by the groove 141b, the second layer 132 and the second connection end 13b extend outward from the groove 141b, and the first layer 131 and the first connection end 13a are encapsulated in the molding compound 14, as shown in fig. 6.
As a third embodiment, as shown in fig. 9 to 12b, unlike the first embodiment, the recess in the molding compound 14 is provided in the form of a groove, and the groove is opened in the second surface of the molding compound, i.e., the surface that is in contact with the deep pit surface 10a (side surface) of the cell, i.e., the inner surface of the molding compound (so the recess in this embodiment is not shown in the drawings). The groove serves as an outlet of the FPC13, the bent portion 133 of the FPC13 is received by the groove, the second layer 132 and the second connection end 13b extend outward from the groove, and the first layer 131 and the first connection end 13a are encapsulated in the encapsulant 14, as shown in fig. 10.
As a fourth embodiment, as shown in fig. 13 to 16c, unlike the first embodiment, the concave portion 141d of the molding compound 14 is provided in a groove shape, and two grooves 141d are opened on the first surface 14a of the molding compound 14 and are located at both ends of the molding compound 14, as shown in fig. 16 a. Specifically, the groove 141d serves as an outlet of the two FPCs 13, 13', for example, as shown in fig. 16b, the bending portion 133 of the left FPC13 is received by the left groove 141d, the second layer 132 and the second connection end 13b thereof extend outward from the groove 141d, and the first layer 131 and the first connection end 13a are encapsulated in the molding compound 14, as shown in fig. 13; as shown in fig. 16c, the bent portion 133 'of the FPC 13' on the right side is received by the groove 141d on the right side, the lower layer 131 'of the FPC 13' is encapsulated in the molding compound 14, the bent portion 133 'is received by the groove 141d, and the upper layer 132' extends outward and is located above the first surface 14a of the molding compound 14, as shown in fig. 14.
As a fifth embodiment, as shown in fig. 17 to 20, unlike the first embodiment, the recess (not shown) of the molding compound 14 is provided in a groove shape, and two grooves are formed on the second surface of the molding compound, i.e., the surface that is in contact with the deep pit surface 10a (side surface) of the cell, i.e., the inner side surface of the molding compound 14 (so the recess of the present embodiment is not shown in the drawings). And the two grooves are respectively positioned at the two ends of the glue injection body 14. The two grooves are used as outlets of the FPCs 13, 13' on the left and right sides, wherein, referring to fig. 17 and 20, the bending part 133 of the left FPC13 is accommodated by the left groove, the second layer 132 and the second connection end 13b extend outwards from the groove, and the first layer 131 and the first connection end 13a are encapsulated in the glue, as shown in fig. 18 a; referring to fig. 17 and 20, the bent portion 133 'of the FPC 13' on the right is received by the groove on the right, the lower layer 131 'of the FPC 13' is encapsulated within the molding compound 14, the bent portion 133 'is received on the groove, and the upper layer 132' extends outwardly and over the first surface 14a of the molding compound 14, see fig. 18 b.
It should be noted that the second connection terminals 13b of the FPC 13/13', i.e. the connection terminals connected to the external electronic product, are higher than the first surface 14a of the glue injection body 14 after extending from the concave parts 141a,141b,141 d. In addition, as shown in the above embodiments, in the present invention, the number of the FPCs 13/13' is not limited, and the extending direction of the FPCs may be various, for example, the FPCs may be flat along the length direction or the width direction of the battery cell 10, or may be bent along the pit surface 11a of the battery cell 10 and extended along the tail end of the battery cell 10, or may be bent along the upper surface of the molding compound 14 and extended along the front end of the battery cell 10.
Since the concave portions 141a,141b,141d are formed in the molding compound 14, and the second connecting terminals 13b of the FPC 13/13' extend to protrude outside the molding compound 14, accordingly, in the injection molding packaging process, the mold for forming the molding compound 14 can be adapted to the wiring requirements of various FPCs, for example, when FPCs with different second connecting terminal positions are required to be adopted to adapt to soldering points of different products, the mold for the molding compound does not need to be replaced, and a mold with concave portions, such as a mold with a consistent molding compound, can still be adopted. Therefore, the investment of the production manufacturer on the injection mold is greatly reduced, thereby simplifying the production and manufacturing process and reducing the production cost. In addition, since the second layer 132/132 ' and the second connecting terminals 13b of the FPC13/13 ' extend outward from the concave portions 141a,141b,141d of the molding compound 14, it can be seen that, for electronic products with different soldering positions, the length of the second layer 132/132 ' of the FPC can be adjusted, so as to adjust the positions of the second connecting terminals 13 b. That is, for electronic products with different welding positions, only the corresponding FPC needs to be replaced, and the whole injection mold does not need to be replaced.
Specifically, in the packaging process of the lithium battery 1, the FPC13/13 ' having a specific shape is first welded to the PCB12, then the FPC13/13 ' and the PCB12 are welded to the cell tab 11 as a whole, and then the PCB12, the FPC13/13 ' and the cell tab 11 are packaged at one end of the deep pit surface 10a of the lithium battery by low pressure injection using a mold having the above-mentioned concave portion to form the glue injection body 14 having the concave portions 141a,141b,141d, and the second layer body and the second connection end of the FPC extend outward from the concave portions 141a,141b,141d, so as to facilitate connection with external electronic products.
The above disclosure is only a preferred embodiment of the present invention, and certainly should not be taken as limiting the scope of the present invention, which is therefore intended to cover all equivalent changes and modifications within the scope of the present invention.
Claims (12)
1. A lithium battery comprises a battery cell, a battery cell lug extending from the end part of the battery cell, a printed circuit board connected with the battery cell lug, a flexible circuit board connected with the printed circuit board, and a glue injection body used for encapsulating the battery cell lug, the printed circuit board and the flexible circuit board; the method is characterized in that: the injection colloid is provided with at least one concave part, the first connecting end of the flexible circuit board is connected with the printed circuit board, and the second connecting end of the flexible circuit board passes through the concave part and protrudes out of the injection colloid.
2. A lithium battery as claimed in claim 1, characterized in that: the flexible circuit board comprises a first layer body with the first connecting end, a second layer body with the second connecting end and forming a height difference with the first layer body, and a bent part connecting the first layer body and the second layer body, wherein the first layer body is at least partially packaged by the glue injection body, and the bent part and the second layer body protrude outwards from the concave part.
3. A lithium battery as claimed in claim 1, characterized in that: the bent part of the flexible circuit board is accommodated in the concave part.
4. A lithium battery as claimed in claim 1, characterized in that: the concave part is a step which is arranged at one end of the glue injection body.
5. A lithium battery as claimed in claim 1, characterized in that: the concave part is a groove which is arranged at one end of the glue injection body.
6. A lithium battery as claimed in claim 1, characterized in that: the gel injection body is provided with a first surface parallel to the upper surface of the battery cell and a second surface attached to the deep pit surface of the battery cell.
7. A lithium battery as claimed in claim 6, characterized in that: the second connecting end of the flexible circuit board is higher than the first surface of the glue injection body.
8. A lithium battery as claimed in claim 6, characterized in that: the recess is opened on the first surface and/or the second surface.
9. A lithium battery as claimed in claim 1, characterized in that: the second layer body and the second connecting end are connected in an L shape.
10. A lithium battery as claimed in claim 1, characterized in that: the flexible circuit board is flat along the length direction or the width direction of the battery core.
11. A lithium battery as claimed in claim 10, characterized in that: the flexible circuit board is bent along the pit surface of the battery cell and extends out along the tail end of the battery cell.
12. A lithium battery as claimed in claim 10, characterized in that: the flexible circuit board is bent along the upper surface of the glue injection body and extends out of the front end of the battery core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911211768.2A CN111081914A (en) | 2019-11-28 | 2019-11-28 | Lithium battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911211768.2A CN111081914A (en) | 2019-11-28 | 2019-11-28 | Lithium battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111081914A true CN111081914A (en) | 2020-04-28 |
Family
ID=70312313
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911211768.2A Withdrawn CN111081914A (en) | 2019-11-28 | 2019-11-28 | Lithium battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111081914A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113921999A (en) * | 2020-07-07 | 2022-01-11 | 东莞新能德科技有限公司 | Battery, battery wire outlet method and electronic device |
-
2019
- 2019-11-28 CN CN201911211768.2A patent/CN111081914A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113921999A (en) * | 2020-07-07 | 2022-01-11 | 东莞新能德科技有限公司 | Battery, battery wire outlet method and electronic device |
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|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20200428 |