CN201374361Y - Lithium ion battery - Google Patents

Abstract

The utility model provides a lithium-ion battery, comprising a battery cell, a top cover, a protection circuit board and a bracket, the top cover is arranged on the bracket, the protection circuit board is arranged between the top cover and the bracket, and the bracket is provided with a first mounting hole. A second installation hole communicated with the first installation hole is opened on the battery core, and the bracket is fixed on the battery core through a connecting piece passing through the first and second installation holes. During encapsulation, the connectors are passed through the first and second mounting holes, the bracket is fixed on the battery cell, and then the top cover and the protective circuit board are arranged on the bracket, so as to realize the encapsulation of the lithium-ion battery. Compared with the existing technology, this technical solution simplifies the assembly process and improves production efficiency by fixing the bracket through the connector, and does not need to invest in specific equipment and molds for each specific product, and the investment cost is low. In addition, the connector is packaged in Inside, the structure has a beautiful appearance, and there is no requirement for the polarity position of the protective circuit board, and the structure has better versatility.

Description

A lithium ion battery

technical field

The utility model belongs to a battery, in particular to a lithium ion battery.

Background technique

As a rechargeable battery with high capacity, high output power, safety, environmental protection, and pollution-free, lithium-ion batteries have been more and more widely used in electronic equipment in recent years, and have become the standard configuration of electronic equipment such as mobile phones.

At present, most lithium-ion batteries have omitted the plastic shell, and the upper and lower ends of the battery cell are respectively provided with end covers (ie, top cover and bottom cover). There are four common packaging structures:

Glue filling structure: the end cover is made by integral glue filling, and the battery protection circuit board is glued between the end cover and the battery cell. The disadvantages of this method are: the degree of firmness between the end cap and the cell is low; the processing temperature is high, which has a certain impact on electronic components and cells; if the contact terminal adopts a gold brick structure or increases When the temperature fuse is over, low pressure injection molding cannot be realized;

Laser welding bracket structure: it can overcome the shortcomings of the glue filling structure, but the metal bracket adopts an insert injection molding structure, and the cost is relatively high;

The bracket is fixed by glue: the cost of the bracket is reduced, but because of the need for pressure-holding equipment when gluing, the cost is also high; and the glue structure is easy to dislocate and overflow, and the defect rate is high;

Top cover screw structure: It can overcome the shortcomings of the above structure, but because the screws must be fixed at both ends of the top cover, otherwise the circuit board space will become very narrow and electronic components cannot be placed. If the customer requires the contact terminals to be at both ends of the top cover, it cannot be used.

Utility model content

The technical problem to be solved by the utility model is that the lithium-ion battery packaging process in the above-mentioned prior art is complicated, the cost is high, and the structural versatility is poor.

In order to solve the above technical problems, the embodiment of the utility model provides a lithium-ion battery, including a cell, a top cover, a protection circuit board and a bracket, the top cover is set on the bracket, and the protection circuit board is set on the Between the top cover and the bracket, the bracket is provided with a first mounting hole, and the battery core is provided with a second mounting hole communicating with the first mounting hole, and the bracket is penetrated through a connecting piece in the The first and second mounting holes are fixed on the electric core.

During encapsulation, the connectors are installed in the first and second mounting holes, the bracket is fixed on the battery cell, and then the top cover and the protective circuit board are arranged on the bracket, so as to realize the encapsulation of the lithium-ion battery. Compared with the existing technology, this technical solution uses a simple mechanical fixing method to complete the packaging by fixing the bracket through the connector, without the need for high-temperature glue or glue, which simplifies the assembly process and improves production efficiency, and does not need to be customized for each specific product. Investing in specific equipment, molds or using expensive insert injection molding structures has low investment costs. In addition, the connectors are encapsulated inside, the structure has a beautiful appearance, and there is no requirement for the polarity position of the protective circuit board, and the structure has better versatility.

Description of drawings

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

Figure 2 is an exploded schematic view of Figure 1;

Fig. 3 is a schematic structural diagram of the bracket in Fig. 1 .

Detailed ways

In order to make the technical problems, technical solutions and beneficial effects to be solved by the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

Please refer to Fig. 1 and Fig. 2, the utility model embodiment provides a kind of lithium-ion battery, comprises cell 1, top cover 2, protection circuit board 3 and support 4, and top cover 2 is arranged on support 4, and protection circuit board 3 Set between the top cover 2 and the bracket 4. A first installation hole 41 is opened on the bracket 4, and a second installation hole 42 communicating with the first installation hole 41 is opened on the battery cell 1. The bracket 4 is passed through the first and second installation holes 41, 41 through a connecting piece 43. 42 is internally fixed on the electric core 1.

Specifically, as shown in FIG. 1 , the packaged lithium-ion battery in this embodiment has a substantially square shape, so that the top cover 2 , the bracket 4 and the battery cell 1 also have a square shape.

Wherein, there is a cover plate 11 at the end of the battery cell 1 , and the cover plate 11 defines a second installation hole 42 which is a blind hole. Both left and right ends of the bracket 4 are provided with first installation holes 41 , and two second installation holes 42 are correspondingly provided on the cover plate 11 . The connecting piece 43 may be a screw, and the first and second mounting holes 41 and 42 are threaded holes matching the screw. In this way, both ends of the bracket 4 are locked in the threaded holes by screws, so that they are firmly fixed on the battery cell 1 . The screws can be self-tapping screws to further simplify the assembly process and improve production efficiency.

As shown in Figure 3, in order to ensure the strength of the screw locking and the discharge of the aluminum chips of the battery cell 1 during the screw tightening process, a chip groove 411 communicating with the first mounting hole 41 is provided on one side of the screw head on the bracket 4 , the chip pocket 411 is a circular counterbore, and its diameter is larger than that of the first installation hole 41 .

The bracket 4 is provided with an avoidance space 44 between the two first installation holes 41. In this embodiment, the avoidance space 44 is a square through hole, and a secondary protection device 45 can be arranged in the avoidance space 44. The secondary protection The device 45 is electrically connected with the protection circuit board 3 and the battery cell 1 respectively, so as to realize the secondary protection of the lithium-ion battery. The secondary protection device 45 may be a temperature protector, which protects the circuit board 3 from detecting the temperature of the battery and prevents the battery from being damaged due to excessive temperature.

In this embodiment, the bottom of the secondary protection device 45 is electrically connected to the negative electrode 12 of the battery cell 1 by spot welding, and the negative electrode 12 can be a rivet connected to the battery cell 1, wherein the rivet head is an oval boss, serving as the battery cell 1 negative pole 12 output terminal. In order to prevent the secondary protection device 45 from touching the positive pole of the battery cell 1, the bottom of the bracket 4 is provided with a sheet surface pad 13 for insulation below the avoidance space 44, and the negative pole 12 of the battery cell 1 can pass through the surface pad 13 and contact with the battery cell 1. The secondary protection device 45 is electrically connected. Specifically, the surface pad 13 is provided with an insertion hole 14 matching the shape of the negative electrode 12, and the insertion hole 14 is also oval, so that after the negative electrode 12 is inserted into the insertion hole 14, its top surface is flush with the upper surface of the surface pad 13. . Like this, after the secondary protection device 45 is placed in the avoidance space 44, it can be fixed on the negative pole 12 by spot welding, and is electrically connected with the negative pole 12, and at the same time, due to the insulation protection of the surface pad 13, the secondary protection device 45 is connected to the electric pole. Core 4 is positively isolated.

Of course, the secondary protection device 45 can also be electrically connected to the positive pole of the battery cell 1 and insulated from the negative pole 12 of the battery cell 1, as long as the secondary protection device 45 is electrically connected to the battery cell 1 and can protect the battery cell 1 functions are all within the protection scope of the present utility model.

If the secondary protection device 45 is electrically connected to the protective circuit board 3, and the lead wires on both sides are not long enough, a conductive member can be respectively connected to the ends of the lead wires on both sides of the secondary protection device 45. In this embodiment, The conductive member is a nickel strip 46 , which is in the shape of a "ㄩ", which can be stuck on the side of the protection circuit board 3 and electrically connected with the protection circuit board 3 . If the lead wires on both sides of the secondary protection device 45 are of sufficient length, the nickel strip 46 may not be needed, and they are directly electrically connected to the protection circuit board 3 .

As shown in FIG. 2 , a slot 21 is provided on the top cover 2 , and a buckle 22 matching the slot 21 is provided on the bracket 4 . In this embodiment, there are four card slots 21 , which are respectively arranged on both sides of the top cover 2 . Correspondingly, there are also four buckles 22 , which are respectively arranged on both sides of the bracket 4 . After the buckle 22 is locked in the slot 21, the top cover 2 can be fixed on the bracket 4, and the installation method is fastened and fixed, which is convenient for installation.

In addition, the bottom of the top cover 2 has an inwardly recessed cavity, so that an accommodating space (not shown in the figure) is formed between the top cover 2 and the bracket 4 , and the protective circuit board 3 can be disposed in the accommodating space. Both ends of the protective circuit board 3 are respectively provided with protruding contact terminals 31, and a through hole 23 corresponding to the shape of the contact terminal is opened on the top cover 2. When the top cover 2 is fastened on the bracket 4, the protection circuit The board 3 is located in the accommodating space, and the contact terminal 31 passes through the through hole 23 , and its end surface is flush with the surface of the top cover 2 , so as to be connected with the electronic device through the contact terminal 31 .

The above-mentioned connecting piece 43 and the first and second mounting holes 41, 42 can be installed in addition to threaded connection, and other installation and fixing methods can also be used, as long as the bracket 4 can be fixed on the battery cell 1 through the connecting piece 43. Within the protection scope of the present utility model.

When packaging, the connector 43 is inserted in the first and second installation holes 41 and 42, the bracket 4 is fixed on the battery cell 1, and the top cover 2 and the protective circuit board 3 are arranged on the bracket 4, so as to realize lithium battery life. Encapsulation of ion batteries. Compared with the prior art, this technical solution fixes the bracket 4 through the connecting piece 43, and completes the packaging by a simple mechanical fixing method, without the need for high-temperature glue filling or glue, which simplifies the assembly process and improves production efficiency, and does not need to be repaired for each model. Specific products are invested in specific equipment, molds or expensive insert injection molding structures, and the investment cost is low. In addition, the connector 43 is encapsulated inside, the structure is beautiful, and there is no requirement for the polarity position of the protective circuit board 3, and the structure is universal. Sex is better.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present utility model shall be included in this utility model. within the scope of protection of utility models.

Claims (10)

1, a kind of lithium ion battery; comprise electric core, top cover, protection circuit plate and support; described top cover is arranged on the described support; described protection circuit plate is arranged between described top cover and the support; it is characterized in that: described support offers first installing hole; offer second installing hole that communicates with described first installing hole on the described electric core, described support is arranged in described first, second installing hole internal fixation on described electric core by a connection piece.

2, lithium ion battery as claimed in claim 1 is characterized in that: offer on the described support and dodge the space, be provided with the second class protection device that electrically connects with described protection circuit plate and electric core in the space in described dodging.

3, lithium ion battery as claimed in claim 2 is characterized in that: the bottom of described support is provided with the face pad that is used to insulate in described below of dodging the space, and the negative pole of described electric core passes described pad and described second class protection device electrically connects.

4, lithium ion battery as claimed in claim 2 is characterized in that: electrically connect by a conductive member between described second class protection device and the protection circuit plate.

5, lithium ion battery as claimed in claim 1 is characterized in that: described support is provided with the chip pocket that communicates with described first installing hole.

6, lithium ion battery as claimed in claim 1 is characterized in that: described top cover is provided with draw-in groove, is provided with the buckle that is complementary with described draw-in groove on described support, and described buckle is arranged in the described draw-in groove.

7, lithium ion battery as claimed in claim 1 is characterized in that: have accommodation space between described top cover and the support, described protection circuit plate is arranged in the described accommodation space.

8, lithium ion battery as claimed in claim 1 is characterized in that: have cover plate on the described electric core, described second installing hole is arranged on the described cover plate.

9, lithium ion battery as claimed in claim 8 is characterized in that: described second installing hole is a blind hole.

10, as each described lithium ion battery of claim 1-9, it is characterized in that: described connector is a screw, and described first, second installing hole is the screwed hole that is complementary with described screw.

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