阅读说明：本技术 电芯及具有该电芯的电子装置 (Battery cell and electronic device with same ) 是由 宋传涛 李锐 南海洋 苏义松 于 2020-03-30 设计创作，主要内容包括：一种电芯(100),包括电极组件(10)和包装袋(20),电极组件(10)包括极耳(12),包装袋(20)用于容纳所述电极组件(10),所述包装袋(20)的四周形成有密封区域(30),所述极耳(12)的一端与所述电极组件(10)的主体(11)电连接,其另一端穿出所述密封区域(30)；所述密封区域(30)中设置有薄弱区域(32),在设定的温度区间内,所述薄弱区域(32)与所述包装袋(20)之间的封装拉力下降以将所述电芯(100)内部的气体排至所述电芯(100)外部。一种电子装置,包括电池,所述电池包括电芯(100)和收容所述电芯(100)的壳体,所述电芯(100)包括上述的电芯(100)。(A battery core (100) comprises an electrode assembly (10) and a packaging bag (20), wherein the electrode assembly (10) comprises a tab (12), the packaging bag (20) is used for accommodating the electrode assembly (10), a sealing area (30) is formed around the packaging bag (20), one end of the tab (12) is electrically connected with a main body (11) of the electrode assembly (10), and the other end of the tab penetrates out of the sealing area (30); a weak area (32) is arranged in the sealing area (30), and in a set temperature range, the packaging tension between the weak area (32) and the packaging bag (20) is reduced so as to discharge gas in the battery cell (100) to the outside of the battery cell (100). An electronic device comprises a battery, wherein the battery comprises a battery core (100) and a shell for accommodating the battery core (100), and the battery core (100) comprises the battery core (100).)

1. A cell, comprising:

an electrode assembly including tabs;

the packaging bag is used for accommodating the electrode assembly, a sealing area is formed on the periphery of the packaging bag, one end of the tab is electrically connected with the main body of the electrode assembly, and the other end of the tab penetrates out of the sealing area;

it is characterized in that the preparation method is characterized in that,

and a weak area is arranged in the sealing area, and in a set temperature range, the packaging tension between the weak area and the packaging bag is reduced so as to discharge the gas in the battery cell to the outside of the battery cell.

2. The cell of claim 1, wherein: defining the packaging tension as F and the temperature as T, wherein the F and the T of the weak area satisfy the following relation: f is (0.5-F) T/20+6.5F-2.75, T is more than or equal to 110 ℃ and less than or equal to 130 ℃, and F is more than or equal to 4.5N/6mm and less than or equal to 5.5N/6 mm.

3. The cell of claim 1, wherein: the battery cell comprises a first sealant and a second sealant, wherein the first sealant and the second sealant are arranged between the tab and the packaging bag, the tab is arranged between the first sealant and the second sealant, the first sealant, the second sealant and the packaging bag are fused to form the weak area, and the thickness of the first sealant or the second sealant is larger than 25 micrometers.

4. The cell of claim 3, wherein: first sealed glue includes first glue film and second glue film, first glue film sets up the second glue film with between the wrapping bag, the second glue film sets up first glue film with between the utmost point ear, in the temperature interval of setting for, first glue film with the wrapping bag or encapsulation pulling force between the second glue film is less than the second glue film with encapsulation pulling force between the utmost point ear.

5. The cell of claim 3, wherein: first sealed glue includes first glue film and second glue film, first glue film sets up the second glue film with between the utmost point ear, the second glue film sets up first glue film with between the wrapping bag, in the temperature interval of setting for, first glue film with utmost point ear or encapsulation pulling force between the second glue film is less than the second glue film with encapsulation pulling force between the wrapping bag.

6. The cell of claim 4 or 5, wherein: the sum of the thicknesses of the first adhesive layer and the second adhesive layer is greater than or equal to 25 micrometers and less than or equal to 100 micrometers, and the thickness of the first adhesive layer or the second adhesive layer is greater than 10 micrometers.

7. The cell of claim 3, wherein: first sealed glue is including the first glue film, second glue film and the third glue film that set up according to the preface, first glue film sets up the second glue film with between the wrapping bag, the third glue film sets up the second glue film with between the utmost point ear, in the temperature interval of setting for, first glue film with encapsulation pulling force between the wrapping bag is less than the second glue film with first glue film or encapsulation pulling force between the third glue film, the third glue film with encapsulation pulling force between the utmost point ear is less than the second glue film with first glue film or encapsulation pulling force between the third glue film.

8. The cell of claim 7, wherein: the sum of the thicknesses of the first adhesive layer, the second adhesive layer and the third adhesive layer is greater than or equal to 25 micrometers and less than or equal to 100 micrometers, and the thickness of the first adhesive layer, the second adhesive layer or the third adhesive layer is greater than 10 micrometers.

9. The cell of claim 1, wherein: the weakened area is provided in the sealing area outside the piercing position of the tab.

10. An electronic device comprising a battery comprising a cell and a housing for housing the cell, wherein the cell comprises the cell of any of claims 1-9.

Technical Field

The application relates to the field of batteries, in particular to an electric core and an electronic device with the electric core.

Background

At present, batteries are arranged in a plurality of electronic devices sold in the market to supply power to the electronic devices, and the battery cores used in the market adopt packaging bags to accommodate electrode assemblies. Along with the gradual improvement of the voltage and the energy density of the battery cell, the thermal stability of the battery cell is gradually reduced, and the failure phenomenon can occur in the safety test, which indicates that the battery cell may have safety problems and cause certain danger when the electronic equipment is used at a consumption end.

Disclosure of Invention

In view of the above, it is necessary to provide a battery cell and an electronic device having the battery cell, aiming to improve the safety problem of the battery cell.

An embodiment of the application provides a battery cell, which comprises an electrode assembly and a packaging bag for accommodating the electrode assembly, wherein the electrode assembly comprises a tab; a sealing area is formed around the packaging bag, one end of the tab is electrically connected with the main body of the electrode assembly, and the other end of the tab penetrates out of the sealing area; and a weak area is arranged in the sealing area, and in a set temperature range, the packaging tension between the weak area and the packaging bag is reduced so as to discharge the gas in the battery cell to the outside of the battery cell.

According to some embodiments of the present application, defining the encapsulation pulling force as F (in N/6mm) and the temperature as T, the following relationship is satisfied between F and T of the weak area: f is (0.5-F) multiplied by T/20+6.5 xf-2.75, and all parameters in the relation are calculated by numerical values, T is more than or equal to 110 ℃ and less than or equal to 130 ℃, and F is more than or equal to 4.5N/6mm and less than or equal to 5.5N/6 mm.

According to some embodiments of this application, the electric core is including setting up the utmost point ear with sealed glue of first sealant and second between the wrapping bag, the utmost point ear sets up first sealed glue with sealed glue of second between, first sealed glue the sealed glue of second with the wrapping bag forms through the heat fusion weak area, first sealed glue or the sealed thickness of glue of second is greater than 25 μm.

According to some embodiments of this application, first sealed glue includes first glue film and second glue film, first glue film sets up the second glue film with between the wrapping bag, the second glue film sets up first glue film with between the utmost point ear, in the temperature interval of settlement, first glue film with the wrapping bag or encapsulation pulling force between the second glue film is less than the second glue film with encapsulation pulling force between the utmost point ear.

According to some embodiments of this application, first sealed glue includes first glue film and second glue film, first glue film sets up the second glue film with between the utmost point ear, the second glue film sets up first glue film with between the wrapping bag, in the temperature interval of settlement, first glue film with utmost point ear or encapsulation pulling force between the second glue film is less than the second glue film with encapsulation pulling force between the wrapping bag.

According to some embodiments of the present application, a sum of thicknesses of the first glue layer and the second glue layer is greater than or equal to 25 μm and less than or equal to 100 μm, and a thickness of the first glue layer or the second glue layer is greater than 10 μm.

According to some embodiments of this application, first sealed glue is including the first glue film, second glue film and the third glue film that set up according to the preface, first glue film sets up the second glue film with between the wrapping bag, the third glue film sets up the second glue film with between the utmost point ear, in the temperature interval of settlement, first glue film with encapsulation pulling force between the wrapping bag is less than the second glue film with first glue film or encapsulation pulling force between the third glue film, the third glue film with encapsulation pulling force between the utmost point ear is less than the second glue film with first glue film or encapsulation pulling force between the third glue film.

According to some embodiments of the present application, a sum of thicknesses of the first adhesive layer, the second adhesive layer, and the third adhesive layer is greater than or equal to 25 μm and less than or equal to 100 μm, and a thickness of the first adhesive layer, the second adhesive layer, or the third adhesive layer is greater than 10 μm.

According to some embodiments of the application, the weakened area is provided in the sealing area outside the exit position of the tab.

An embodiment of the present application further provides an electronic device, including a battery, where the battery includes a battery cell and a casing accommodating the battery cell, and the battery cell includes the above battery cell.

Above-mentioned electric core and have electronic device of this electric core set up weak area through the sealed area at the wrapping bag to make the encapsulation pulling force between this weak area and the wrapping bag descend in the temperature interval of settlement, thereby behind the inside heat accumulation of electric core, discharge the high temperature gas that produces inside the electric core to the electric core outside through this weak area, reduced the inside heat accumulation of electric core and the deformation degree of electric core, and then can improve the security performance of electric core by a wide margin.

Drawings

Fig. 1 is a cross-sectional view of a cell in a first embodiment of the present application.

Fig. 2 is a cross-sectional view of the cell of fig. 1 at a tab.

Fig. 3 is a cross-sectional view at a tab of a cell in a second embodiment of the present application.

Fig. 4 is a cross-sectional view at a tab of a cell in a third embodiment of the present application.

Fig. 5 is a cross-sectional view at a tab of a cell in a fourth embodiment of the present application.

Fig. 6 is a cross-sectional view of a battery cell in a fifth embodiment of the present application.

Fig. 7 is a cross-sectional view of a weakened region of the cell of fig. 6.

Description of the main element symbols:

battery cell 100

Electrode assembly 10

Electrode assembly body 11

Tab 12

Positive electrode tab 121

Negative pole tab 122

Packaging bag 20

Sealing area 30

Encapsulation area 31

Weakened area 32

First sealant 321

First adhesive layer 3211

Second adhesive layer 3212

Third adhesive layer 3213

Second sealant 322

The specific implementation mode is as follows:

the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art without any inventive work based on the embodiments in the present application are within the scope of protection of the present application.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.

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 application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "or/and" includes any and all combinations of one or more of the associated listed items.

The application provides a battery core, it includes electrode subassembly and is used for holding electrode subassembly's wrapping bag, electrode subassembly include utmost point ear, be formed with sealed area all around of wrapping bag, the one end of utmost point ear with electrode subassembly's main part electricity is connected, and its other end is worn out sealed area. And a weak area is arranged in the sealing area, and in a set temperature range, the packaging tension between the weak area and the packaging bag is reduced so as to discharge the gas in the battery cell to the outside of the battery cell.

Referring to fig. 1 to fig. 2, a battery cell 100 is provided in a first embodiment of the present disclosure. The battery cell 100 includes an electrode assembly 10 and a packaging bag 20. The electrode assembly 10 is covered by the packing bag 20. The pouch 20 hermetically receives the electrode assembly 10 through a peripheral sealing region 30.

Specifically, the electrode assembly 10 includes an electrode assembly main body 11 and tabs 12 electrically connected to the electrode assembly main body 11. The tab 12 is disposed on one end surface of the electrode assembly main body 11.

The packaging bag 20 is used for accommodating the electrode assembly main body 11, and the tab 12 is arranged at one end of the electrode assembly main body 11 through the sealing area 30, so that the other end of the tab 12 penetrates out of the sealing area 30 to expose the packaging bag 20.

The sealing region 30 includes a weakened region 32. One end of the tab 12 penetrates the weakened area 32. When the temperature rises to a certain range, the packaging strength of the weak region 32 is rapidly reduced, so that the weak region 32 discharges gas generated by the electrode assembly main body 11 to the outside of the packaging bag in the temperature range, the temperature of the electrode assembly main body 11 and the deformation degree of the battery cell are reduced, and safety problems such as short circuit, fire and the like are avoided. In some embodiments, the temperature range is 110 ℃ to 130 ℃, and can be adjusted according to actual requirements.

In some embodiments, the encapsulation pull force F (in N/6mm) of the area of weakness 32 and the temperature T satisfy the following relationship: f ═ 0.5-f.times.T/20 +6.5 xf-2.75, T ≦ 130 ℃ at 110 ℃ and 4.5N/6mm ≦ F ≦ 5.5N/6mm, and each parameter in the above-described relationship is calculated as a numerical value. When the temperature is lower than 110 ℃, the packaging tension of the weak area 32 is approximately the same as that of other packaging areas, and gas cannot be released to the outside through the weak area 32; when the temperature reaches or exceeds 130 ℃, the packaging tension of the weak area 32 is rapidly reduced to almost disappear, and the packaging tension of other packaging areas is approximately kept unchanged, so that the weak area 32 is flushed away by gas in the battery cell to ensure the safety performance of the battery cell.

Specifically, the weakened region 32 includes a first sealant 321 and a second sealant 322. Both sides of the tab 12 are respectively bonded by the first sealant 321 and the second sealant 322, and then the weak region 32 is formed together with a portion of the packaging bag 20 by means of heat pressing.

In some embodiments, the first sealant 321 and the second sealant 322 are a single layer of glue. When the temperature of the adhesive layer rises to 110-130 ℃, the packaging tension between the first sealant 321 and the second sealant 322 and the packaging bags 20 and the tabs 12 on the two sides of the first sealant and the second sealant sharply decreases.

In some embodiments, the thickness of the first sealant 321 and the second sealant 322 are greater than 25 μm. Preferably, the thicknesses of the first sealant 321 and the second sealant 322 are 30 μm, respectively.

Referring to fig. 3, a tab 12 of a battery cell 100 according to a second embodiment of the present disclosure is provided. Unlike the first embodiment, the first sealant 321 and the second sealant 322 are composed of two adhesive layers.

Specifically, the first sealant 321 includes a first adhesive layer 3211 and a second adhesive layer 3212. The first glue film 3211 is arranged between the second glue film 3212 and the packaging bag 20, and the second glue film 3212 is arranged between the first glue film 3211 and the tab 12. The packaging tension of the first adhesive layer 3211 is in accordance with the above-mentioned relationship between the packaging tension and the temperature of the weak area 32. The second adhesive layer 3212 has substantially the same tension variation as other package regions.

When the temperature rises to 110 to 130 ℃, the packaging tension between the first adhesive layer 3211 and the packaging bag 20 or the second adhesive layer 3212 is sharply reduced, and the packaging tension between the second adhesive layer 3212 and the tab 12 is maintained, so that a tension weak area 32 exists between the first adhesive layer 3211 and the packaging bag 20 or the second adhesive layer 3212, and high-temperature gas generated by the electrode assembly main body 11 can be exhausted.

In some embodiments, the second sealant 322 may be identical in structure to the first sealant 321.

In some embodiments, the sum of the thicknesses of the first adhesive layer 3211 and the second adhesive layer 3212 ranges from 25 μm to 100 μm, and the thicknesses of the first adhesive layer 3211 and the second adhesive layer 3212 are both greater than 10 μm. Preferably, the thicknesses of the first adhesive layer 3211 and the second adhesive layer 3212 are 15 μm, respectively.

It will be appreciated that the second sealant 322 may also be the same as the second sealant 322 of the first embodiment. Otherwise, the first sealant 321 is the same as the first sealant 321 in the first embodiment, and the second sealant 322 may include two layers of glue.

Referring to fig. 4, a tab 12 of a battery cell 100 according to a third embodiment of the present disclosure is provided. Unlike the first embodiment, the first sealant 321 and the second sealant 322 are composed of two adhesive layers. And differs from the second embodiment in that the two glue layers are arranged in the reverse order.

Specifically, the first sealant 321 includes a first adhesive layer 3211 and a second adhesive layer 3212. The first glue film 3211 is arranged between the second glue film 3212 and the tab 12, and the second glue film 3212 is arranged between the first glue film 3211 and the packaging bag 20. The packaging tension of the first adhesive layer 3211 is in accordance with the above-mentioned relationship between the packaging tension and the temperature of the weak area 32. The second adhesive layer 3212 has substantially the same tension variation as other package regions.

When the temperature rises to 110 to 130 ℃, the packaging tension between the first adhesive layer 3211 and the tab 12 or the second adhesive layer 3212 is sharply reduced, and the packaging tension between the second adhesive layer 3212 and the packaging bag 20 is maintained, so that a tension weak area 32 exists between the first adhesive layer 3211 and the tab 12 or the second adhesive layer 3212, and high-temperature gas generated from the electrode assembly main body 11 can be exhausted.

In some embodiments, the second sealant 322 may be identical in structure to the first sealant 321.

In some embodiments, the sum of the thicknesses of the first adhesive layer 3211 and the second adhesive layer 3212 ranges from 25 μm to 100 μm, and the thicknesses of the first adhesive layer 3211 and the second adhesive layer 3212 are both greater than 10 μm. Preferably, the thicknesses of the first adhesive layer 3211 and the second adhesive layer 3212 are 15 μm, respectively.

It is understood that the second sealant 322 can also be the same as the second sealant 322 of the first or second embodiments. On the contrary, the first sealant 321 is the same as the first sealant 321 in the first embodiment or the second embodiment, and the second sealant 322 may include two layers of glue.

Referring to fig. 5, a tab 12 of a battery cell 100 according to a fourth embodiment of the present disclosure is provided. Unlike the first embodiment, the first sealant 321 and the second sealant 322 are composed of three layers of glue.

Specifically, the first sealant 321 includes a first adhesive layer 3211, a second adhesive layer 3212, and a third adhesive layer 3213. The first adhesive layer 3211 is disposed between the second adhesive layer 3212 and the packaging bag 20, and the second adhesive layer 3212 is disposed between the first adhesive layer 3211 and the third adhesive layer 3213. The third adhesive layer 3213 is disposed between the second adhesive layer 3212 and the tab 12. The packaging tension of the first adhesive layer 3211 and the third adhesive layer 3213 conforms to the relationship between the packaging tension and the temperature of the weak area 32. The second adhesive layer 3212 has substantially the same tension variation as other package regions.

When the temperature rises to 110 to 130 ℃, the packaging tension between the first adhesive layer 3211 and the packaging bag 20 is sharply reduced, the packaging tension between the third adhesive layer 3213 and the tab 12 is sharply reduced, and the packaging tension between the second adhesive layer 3212 and the first adhesive layer 3211 and the third adhesive layer 3213 is maintained or slightly reduced, so that a tension weak area 32 exists between the first adhesive layer 3211 and the packaging bag 20 or between the third adhesive layer 3213 and the tab 12, and high-temperature gas generated by the electrode assembly main body 11 can be exhausted.

In some embodiments, the second sealant 322 may be identical in structure to the first sealant 321.

In some embodiments, the sum of the thicknesses of the first adhesive layer 3211, the second adhesive layer 3212, and the third adhesive layer 3213 ranges from 25 μm to 100 μm, and the thicknesses of the first adhesive layer 3211, the second adhesive layer 3212, and the third adhesive layer 3213 are all greater than 10 μm. Preferably, the thicknesses of the first adhesive layer 3211, the second adhesive layer 3212, and the third adhesive layer 3213 are 13 μm, respectively.

It will be appreciated that the second sealant 322 may also be the same as the second sealant 322 of the first, second or third embodiments. On the contrary, the first sealant 321 is the same as the first sealant 321 in the first, second or third embodiments, and the second sealant 322 may include three layers of adhesive layers.

It is understood that the packaging tension of the second adhesive layer 3212 can also be in accordance with the above-mentioned relation between the packaging tension of the weak area 32 and the temperature, and accordingly, the packaging tension of the first adhesive layer 3211 and the third adhesive layer 3213 is substantially the same as the tension of other packaging areas.

Referring to fig. 6 and fig. 7, a battery cell 100 according to a fifth embodiment of the present disclosure is provided. In contrast to the first exemplary embodiment, the tab 12 is encapsulated by an encapsulation region 31 of the sealing region 30. And includes a weakened area 32 in the other sealed area 30 of the package 20.

Specifically, the weakened area 32 bonds the sides of the package 20. When the temperature rises to 110 to 130 ℃, the sealing tension between the weak region 32 and the packaging bag 20 on both sides thereof is sharply reduced, so that the sealing of the packaging bag 20 at the portion is failed, so that high-temperature gas generated from the electrode assembly main body 11 can be discharged therefrom.

In some embodiments, the tabs 12 include a positive tab 121 and a negative tab 122, the positive tab 121 may be made of aluminum, and the negative tab 122 may be made of nickel. The positive electrode tab 121 and the negative electrode tab 122 are disposed on the end surface of the electrode assembly 11 main body so as to face each other.

The first sealant 321 and the second sealant in the first embodiment, the first adhesive layer 3211 in the second embodiment and the third embodiment, the first adhesive layer 3211 and the third adhesive layer 3213 in the fourth embodiment, and the weak area 32 in the fifth embodiment can be prepared by adjusting the ratio of polypropylene (PP) to Polyethylene (PE). For example, a PP gum and a PE gum are blended in a mass ratio of 1: 1. The material with larger difference with the expansion coefficient of the PP glue can be blended with the PP glue when the temperature is higher than 110 ℃.

And (3) carrying out packaging tension test on the colloid of the PP glue and the PE glue in a mass ratio of 1:1 and the common packaging glue.

Example (b): and (3) packaging the battery cell tab by using a colloid of PP (polypropylene) glue and PE (polyethylene) glue in a ratio of 1: 1.

Comparative example: a common encapsulation compound encapsulates the electrical core tabs.

And (3) clamping the batteries packaged in the embodiment and the batteries packaged in the comparative example on a tensile machine respectively, and carrying out tensile test after heat preservation for 5min at different temperatures. The test results are: the battery in the embodiment is rapidly reduced in packaging tension at 110-130 ℃; the cell of the comparative example showed a decrease in the sealing tension after a temperature of over 150 c (the conventional sealing adhesive failed at 150 c).

The embodiment of the present application further provides an electronic device, which includes a battery, where the battery includes a battery cell 100 and a casing accommodating the battery cell 100, and the battery cell includes the battery cell in any one of the above embodiments.

Above-mentioned electric core 100 and have this electric core 100's electron device sets up weak area 32 through sealed area 30 at wrapping bag 20, and make the encapsulation pulling force between weak area 32 and the wrapping bag 20 descend in the temperature interval of setting for, thereby after the inside heat accumulation of electric core 100, discharge the high temperature gas that produces inside electric core 100 outside to electric core 100 through this weak area 32, the heat accumulation of electric core inside and the deformation degree of electric core have been reduced, can improve the security performance of electric core by a wide margin, and then avoid taking place safety problems such as short circuit fire.

Although the present application has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the present application.