WO2010124589A1

WO2010124589A1 - A battery and a manufacturing method for the battery

Info

Publication number: WO2010124589A1
Application number: PCT/CN2010/072093
Authority: WO
Inventors: 王伟强; 王春光; 任灿; 陈保同; 刘铭
Original assignee: 深圳市比克电池有限公司
Priority date: 2009-04-29
Filing date: 2010-04-23
Publication date: 2010-11-04
Also published as: CN101877421A

Abstract

A battery and the manufacturing method for the battery, wherein the battery includes a case and a cell unit with positive electrode terminal and negative electrode terminal, the cell unit is sealed inside the case, the case comprises a basic plate and a complex plate. The complex plate is a flat plate, a chamber is formed in the basic plate to hold the cell unit completely, edges of the basic plate and of the complex plate are jointed each other for sealing the chamber. The chamber is only processed on the basic plate of the battery of this invention, so as to form the chamber which can hold the cell unit, and simplify process and save cost. While metal basic plate acts as a part of the case to keep safety performance of anti-blasting of flexible package battery, to improve mechanical strength of the case, so the case of the battery is not broken easily, the mechanical security during using battery and manufacturing battery is improved.

Description

Battery and manufacturing method thereof

Technical field

The present invention relates to flexible packaging batteries and to a method of manufacturing a flexible packaging battery. Background technique

In a lithium ion battery, in addition to the positive and negative electrodes, the electrolyte, and the separator paper, a housing that stores various reaction components of the lithium ion battery is also a very important component. As an effective component, in addition to providing storage functions, the housing also provides electrode extraction for lithium-ion batteries, while also providing some help for the safety of lithium-ion batteries.

At present, the materials used in the battery casing are mainly: stainless steel, nickel-plated steel, aluminum alloy and aluminum plastic film. The aluminum plastic film has the characteristics of softness and softness. Therefore, the battery using the aluminum plastic film as the casing is a flexible packaging battery, and has been highly valued for its superior safety in preventing explosion. Aluminum plastic film, also known as aluminum-plastic composite film, is a flexible packaging battery prepared by cutting a piece of aluminum-plastic composite film of a certain size, folding aluminum-plastic composite film, and high-temperature compounding the opening edge of the aluminum-plastic composite film to make the battery pole The group is sealed in the interior and the like to complete the manufacture. The aluminum-plastic composite film is generally made of multi-layer composite of PP and aluminum foil. Its mechanical strength is low, and it is easy to be pierced by sharp substances during manufacturing and use, resulting in safety hazards caused by scrapping or scratching. In order to solve the above problem of being easily pierced, a metal or plastic case is usually added to the soft packaged battery to improve its puncture resistance. Summary of the invention

The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a flexible packaging battery having a high mechanical strength.

Another technical problem to be solved by the present invention is to provide a method of processing the above battery. The technical problem of the present invention is solved by the following technical solutions:

A battery comprising a housing and a battery unit sealed therein having a positive electrode lead end and a negative electrode lead end, the case comprising a substrate and a composite plate. The composite plate is a flat plate, and the substrate is formed with a cavity for completely accommodating the battery unit, and the composite plate is connected to the periphery of the substrate to seal the cavity.

In the present embodiment, a preferred composite plate and substrate structure are: the composite plate has a layered structure including at least one metal plate, and the substrate includes a metal plate. The substrate is connected to the composite plate by a heat sealing seal.

The composite sheet described above includes an aluminum-plastic composite film.

The substrate includes any one of an aluminum plate, a steel plate, an aluminum foil, or a copper foil.

The above battery is a lithium ion battery.

A battery manufacturing method includes the following steps:

A. preparing a battery unit having a positive electrode lead end and a negative electrode lead end, and cutting a plate-shaped substrate of a certain size and a flat composite plate;

B. stamping the substrate such that the substrate forms a cavity and a periphery that can completely accommodate the battery unit;

c. completely insert the battery unit into the above cavity;

D. The composite board is connected to the periphery of the substrate to seal the battery unit in the cavity, so that the positive electrode lead end and the negative electrode lead end extend beyond the periphery and are fixed between the peripheral edge and the composite plate.

A preferred composite panel and substrate structure is: The composite panel has a layered structure comprising at least one layer of metal, and the substrate comprises a metal sheet.

As an embodiment of the present invention, the above step D further includes the steps of forming a liquid injection channel at a connection between the substrate and the composite plate, injecting the electrolyte into the cavity through the liquid injection channel, and closing the liquid injection channel.

As a second embodiment of the present invention, in assembling the battery unit not impregnated with the electrolyte, the above step B further includes the step of forming a second composite body for discharging the exhaust gas of the cavity by punching the composite plate; The method includes forming a liquid injection channel at a connection between the substrate and the composite plate, the liquid injection channel is connected to the cavity and the second cavity, the second cavity is provided with a second liquid injection channel, and the second liquid injection channel is connected to the second cavity The body and the outside, the step D further includes the step of injecting the electrolyte into the cavity through the second liquid injection channel, the second cavity, and the liquid injection channel, and then closing the liquid injection channel and the second liquid injection channel.

In order to facilitate the exhaust gas discharge, the above steps!) further includes the steps of charging the battery and puncturing the second cavity, so that the gas in the cavity is discharged through the liquid injection channel and the second cavity pierced, and after the exhaust is completed, The process includes closing the above-mentioned liquid injection channel and cutting the second cavity.

The beneficial effects of the present invention compared to the prior art are:

(1) By using a metal substrate as a part of the casing, it not only inherits the high anti-explosion safety performance of the flexible packaging battery, but also improves the mechanical strength of the casing, and the battery casing is not easily pierced, which greatly improves the battery use and manufacture. Mechanical safety in the processing; the substrate is processed to have a cavity for accommodating the battery unit, and the processing is processed, which saves cost; (2) The manufacturing cost of the substrate relative to the composite board is extremely low, and the production cost of the battery can be reduced;

(3) The sealing method of the reserved liquid injection channel is more operability with the way of completely sealing the battery unit, and the production efficiency is greatly improved;

(4) The manufacturing method of exhausting the exhaust gas from the second cavity to the cavity can greatly reduce the probability of the battery expansion of the drum shell;

(5) The method of puncturing the exhaust gas on the second cavity is more conducive to exhaust gas removal. DRAWINGS

The present invention will be further described in detail below with reference to the accompanying drawings. FIG. 1 is a schematic diagram of a structure of a battery according to a specific embodiment of the present invention;

Figure 2 is an enlarged view of C in Figure 1;

3 is a schematic view showing the first step 1 01 of the battery processing method of the present invention;

Figure 4 is an enlarged view of A in Figure 3;

Figure 5 is an enlarged view of B in Figure 3;

6 is a schematic view showing the first step 1 02 of the battery processing method of the present invention;

Figure 7 is a schematic view showing the step 103 of Embodiment 1 of the battery processing method of the present invention. detailed description

A battery, one embodiment of which is a lithium ion battery, as shown in FIG. 1 and FIG. 2, comprising a housing and being sealed therein, having a positive terminal 4 and a negative terminal (with a positive terminal) 4 parallel arrangement, not shown) of the battery unit 3; the housing comprises a substrate 1, a layer of metal layer 11 and a layered structural composite plate 2 composed of a hot melt layer 12 laminated on the front and back of the metal layer 1 1; The positive electrode lead end 4 and the negative electrode lead end are respectively provided with a hot melt layer 10 thereon; the substrate 1 has a C-shaped cross section, and includes a peripheral edge 6 and a cavity 5 having an opening, and the battery unit 3 is disposed in the cavity 5, and the battery unit 3 is disposed. The upper positive terminal 4 and the negative terminal extend beyond the peripheral edge 6 and are sandwiched between the laminated composite panel 2 and the peripheral edge 6. The peripheral edge 6 of the substrate 1 is fused integrally with the laminated composite panel 1 and is positive. The lead end 4 and the negative lead terminal are also fusion-bonded and fixed between the peripheral edge 6 and the layered composite panel 2.

Preferably, the substrate 1 is made of an aluminum plate, a steel plate, an aluminum foil or a copper foil, and the aluminum sheet or the stainless steel is used in a preferred manner, and the A3003 or A3005 annealed 0-state aluminum alloy sheet is used in a preferred manner, and the thickness can be set at 0.18. Between ~0. 35匪, preferably between 0. 22~0. 3mm, in this case, the aluminum alloy sheet with the model A3005 and the thickness of 0.25 inches; the laminated structure composite board 2 uses two layers of PP Middle The interlayer is a layered composite of aluminum foil, and a more preferable method is a sheet of aluminum-plastic composite film of the current flexible packaging battery.

As shown in Tables 1 and 2, Table 1 shows the results of the puncture test of the aluminum-plastic composite film, and Table 2 shows the tensile strength test results of the aluminum-plastic composite film, which shows that the mechanical strength of the aluminum-plastic composite film is low.

Average 54. 93 54. 93 Table 2

In this case, aluminum sheet and aluminum-plastic composite film are used, and the joint portion is made of aluminum sheet and aluminum-plastic composite film, which can improve the mechanical strength of the shell and retain the safety explosion-proof performance of the aluminum-plastic composite film. Table 3 shows the tensile strength test results of aluminum sheets.

table 3

An embodiment of the battery manufacturing method of the present invention is a method for manufacturing a lithium ion battery, comprising the steps of:

Example 1

Step 101, as shown in FIG. 3, FIG. 4 and FIG. 5, a battery unit 3 having a positive electrode terminal 4 and a negative electrode terminal (not shown in parallel with the positive electrode terminal) is prepared, and a thin plate structure having a certain size is cut. The aluminum plate of the model A3003 is used as the layered structural composite board 2 as the substrate 1 and the aluminum-plastic composite film (also referred to as aluminum-plastic composite film) having the laminar structure composite plate of the thin plate structure;

Step 102, as shown in FIG. 6, FIG. 7, the stamped substrate 1 forms a cavity 5 and a peripheral edge 6 which can accommodate the battery unit 3, and then presses the layered structural composite plate 2, so that the second cavity 7 is formed;

Step 103, as shown in FIG. 7, the battery unit 3 is placed in the cavity 5 such that the positive electrode terminal 4 and the negative electrode terminal extend beyond the periphery 6; the laminated composite plate 2 and the periphery 6 of the substrate 1 are thermally fused. Connecting, the positive electrode terminal 4 and the negative electrode terminal are fixed between the layered composite plate 2 and the periphery 6 of the substrate 1, and the battery unit 3 is enclosed inside the cavity 5, and the substrate 1 and the layered structure are simultaneously The junction of the composite plate 2 forms a liquid injection channel 8 and a second liquid injection channel 9, wherein the liquid injection channel 8 communicates with the cavity 5 and the second cavity 7, and the second liquid injection channel 9 communicates the second cavity 7 with the outside; Due to the presence of PP material in the aluminum plastic film, the melting temperature of the PP material is about 150 ° C, considering the machine fluctuation, the temperature of the hot melt composite connection is 90 ° C, and the composite pressure is 3 MPa;

Step 104: The electrolyte is injected into the cavity 5 through the second liquid injection channel 9, the second cavity 7, and the liquid injection channel 8, and then the second liquid injection channel 9 is closed;

Step 105: charging the battery;

Step 106: Piercing the second cavity 7 to exhaust the exhaust gas generated in the cavity 5 through the liquid injection channel 8 and the second cavity 7;

Step 107: Finally, the liquid injection channel 7 is closed, and the second cavity 7 is cut off to produce a battery as shown in FIG.

The battery processed in this example passes the shell connection peel strength test, and the test results are shown in Table 4.

Table 4

Example 2: This example is basically the same as Example 1, except that the compounding temperature in the step 103 is 120 °C.

The processed battery was tested for peel strength by shell connection, and the test results are shown in Table 5.

table 5

Example 3: This example is substantially the same as Example 1, except that the compounding temperature in the step 103 is 140 °C. The processed battery was tested by the shell connection peel strength, and the test results are shown in Table 6. Maximum force of sample (N) Maximum deformation (mm) Test time (S)

601 63. 578 4. 0898 5. 4

602 63. 505 15. 5629 19. 0

603 58. 651 11. 6142 14. 4

Table 6

Example 4: This example is basically the same as Example 1, except that the composite temperature in step 103 is 140 ° C, the composite pressure is IMP, and the processed battery is tested by the shell connection peel strength test. 7 is shown.

Table 7

Example 5: This example is basically the same as Example 3, except that the composite temperature in step 103 is 120 ° C, the composite pressure is 5 MPa, and the processed battery is tested by the shell connection peel strength test. 8 is shown.

Table 8

Comparative Example: The peel strength test results of a conventional composite aluminum-plastic composite film are shown in Table 9.

Table 9

It can be seen from the peel strength comparison test that the pressure is 3MPa and the thermal compound strength at 120 °C is strong. The pressure is 5MPa at a temperature of 120 °C, but it is limited to the long-term use of the equipment, preferably using a pressure of 3 MPa. Compared with the composite strength of the aluminum-plastic composite film, it can be seen that the material of the present invention is used. The composite strength can meet the needs of normal production.

Scanning electron microscopy (SEM) test of the composite position of the present invention shows that the composite layer is relatively tight, and the aluminum sheet and the aluminum-plastic composite film are mutually infiltrated, and the composite effect is good.

Another embodiment of the method of fabricating a battery of the present invention for use in nickel-hydrogen battery processing includes the following steps:

Example 6

Step 601, preparing a battery unit having a positive electrode terminal 4 and a negative electrode terminal, and cutting a certain size of an aluminum plate of the type A3005 having a thin plate structure as the substrate 1 and an aluminum-plastic composite film (also referred to as an aluminum plastic film) having a thin plate structure as Layered composite panel 2;

Step 602, stamping the substrate 1 to form a cavity 5 having a peripheral edge 6 and accommodating the battery unit 3;

Step 603, the battery unit 3 is placed into the cavity 5, so that the positive terminal 4 and the negative terminal extend beyond the periphery 6;

Step 604, the peripheral edge 6 and the layered structural composite plate 2 are thermally fused, so that the positive electrode lead end and the negative electrode lead end are fixed between the layered composite plate 1 and the peripheral edge 6, and the battery unit 3 is sealed inside the cavity 5 to form Complete battery.

In this example, the battery unit 3 has been impregnated with the electrolyte so that the battery unit can be completely sealed in the chamber 5 at one time.

The above is a further detailed description of the present invention in connection with the specific preferred embodiments, and the specific embodiments of the present invention are not limited to the description. It is to be understood by those skilled in the art that the present invention can be delineated or substituted without departing from the spirit and scope of the invention.

Claims

Claim

A battery comprising a housing and a battery unit sealed therein having a positive electrode lead end and a negative electrode lead end, the case comprising a substrate and a composite plate, wherein: the composite plate is a flat plate, The substrate is formed with a cavity that can completely accommodate the battery unit, and the composite plate is connected to the periphery of the substrate to seal the cavity.

2. The battery according to claim 1, wherein: the composite board has a layered structure including at least one metal plate, and the substrate comprises a metal plate.

3. The battery according to claim 2, wherein: the substrate and the composite board are connected by a heat sealing seal.

The battery according to any one of claims 2 or 3, wherein the composite panel comprises an aluminum-plastic composite film.

The battery according to any one of claims 2 to 3, wherein the substrate comprises any one of an aluminum plate, a steel plate, an aluminum foil or a copper foil.

The battery according to any one of claims 1 to 3, wherein the battery is a lithium ion battery.

A battery manufacturing method, comprising the steps of:

A. preparing a battery unit having a positive electrode lead end and a negative electrode lead end, cutting a plate-shaped substrate of a certain size and a flat composite plate;

C. completely insert the battery unit into the cavity;

D. The composite plate is connected to the periphery of the substrate to seal the battery unit in the cavity such that the positive electrode lead end and the negative electrode lead end extend beyond the periphery and are fixed between the peripheral edge and the composite plate.

8. The method of manufacturing a battery according to claim 7, wherein the composite plate has a layered structure including at least one metal plate, and the substrate comprises a metal plate.

The method of manufacturing a battery according to claim 7 or 8, wherein the step D further comprises forming a liquid injection channel at a junction of the substrate and the composite plate, and injecting the electrolyte into the cavity through the liquid injection channel, The step of closing the injection channel.

The battery manufacturing method according to claim 7 or 8, wherein: Step B further includes the step of forming a second cavity for discharging the exhaust gas of the cavity by stamping the composite plate; the step D further comprising forming a liquid injection channel at a junction of the substrate and the composite plate, the liquid injection channel communicating with the cavity And a second cavity, the second cavity is provided with a second liquid injection channel, and the second liquid injection channel communicates with the second cavity and the outside, the step! The method further includes the steps of injecting the electrolyte into the cavity through the second injection channel, the second cavity, and the injection channel, and then closing the injection channel and the second injection channel.

11. The battery manufacturing method according to claim 10, wherein: the step D further comprises: charging the battery, and puncturing the second cavity, so that the gas in the cavity passes through the liquid injection channel and the puncture The second cavity is discharged, and after the exhausting is completed, the process of closing the liquid injection channel and cutting the second cavity is further included.