阅读说明：本技术 电芯及用电装置 (Battery cell and power utilization device ) 是由 吴顺和 许虎 宋华冰 于 2021-08-20 设计创作，主要内容包括：本申请实施例涉及电池技术领域,公开了电芯与用电装置。该电芯包括壳体、电极组件以及极耳。极耳包括第一部分、第二部分以及第三部分。其中,第一部分位于壳体内,并安装于电极组件。第二部分位于电极组件之外,第二部分的一端与第一部分连接。第三部分的一端与第二部分连接,另一端延伸出壳体。第二部分与第一部分之间厚度的比值介于1.1～1.6之间。该电芯中极耳在第二部分的截面积有所增加,所以该极耳在第二部分处的抗冲击性能更佳；即是,本申请实施例提供的电芯可降低目前电芯的极耳在电极组件与壳体之间的部分容易发生断裂的风险。(The embodiment of the application relates to the technical field of batteries and discloses a battery core and an electric device. The battery cell comprises a shell, an electrode assembly and a tab. The tab includes a first portion, a second portion, and a third portion. Wherein the first portion is located within the housing and mounted to the electrode assembly. The second portion is located outside the electrode assembly, and one end of the second portion is connected to the first portion. One end of the third part is connected with the second part, and the other end extends out of the shell. The ratio of the thickness of the second part to the first part is 1.1-1.6. The sectional area of the lug in the battery cell at the second part is increased, so that the impact resistance of the lug at the second part is better; that is, the cell provided by the embodiment of the application can reduce the risk that the part of the tab of the current cell between the electrode assembly and the casing is easy to break.)

1. An electricity core, includes casing, electrode subassembly and utmost point ear, electrode subassembly accept in the casing, its characterized in that, utmost point ear includes:

a first portion located within the case and mounted to the electrode assembly;

a second portion located outside the electrode assembly, one end of the second portion being connected to the first portion; and

one end of the third part is connected with the other end of the second part, and the other end of the third part extends out of the shell;

the thickness of the second part is larger than that of the first part, and the ratio of the thicknesses of the second part and the first part is between 1.1 and 1.6.

2. The cell of claim 1, wherein the first portion has a thickness of between 70 μ ι η and 90 μ ι η and the second portion has a thickness of between 90 μ ι η and 110 μ ι η.

3. The cell of claim 1, wherein the thickness of the third portion is greater than the thickness of the first portion; and/or the presence of a gas in the gas,

the second portion is of a thickness corresponding to the third portion.

4. The cell of claim 1, wherein, in a thickness direction of the tab, both end faces of the first portion are located between both end faces of the second portion.

5. The cell of claim 1, wherein the width of the second portion is greater than the width of the third portion.

6. The battery cell of claim 5, wherein a width ratio between the second portion and the third portion is between 1.1 and 1.6.

7. The cell of claim 1, wherein the width between the second portion and the first portion is the same.

8. The electrical core of claim 1, wherein a surface of the second portion is provided with a fluorocarbon coating.

9. The cell of any of claims 1 to 8, wherein the casing comprises:

a main body portion in which the electrode assembly is housed; and

and a sealing part formed by extending from the edge of the main body part, wherein the tab extends out of the shell through the sealing part.

10. The battery cell of claim 9, further comprising a sealant at least partially disposed on the sealing portion to seal a connection between the sealing portion and the tab;

the sealant is arranged around the tab and covers at least part of the second portion, and/or the sealant is arranged around the tab and covers at least part of the third portion.

11. The cell of claim 9, wherein at least a portion of the second portion is disposed in the seal.

12. An electrical device comprising the cell of any of claims 1 to 11.

[ technical field ] A method for producing a semiconductor device

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

[ background of the invention ]

The battery cell is a device which converts external energy into electric energy and stores the electric energy in the battery cell so as to supply power to external equipment (such as portable electronic equipment) at a required moment. At present, the battery cell is widely applied to electronic products such as mobile phones, flat panels, notebook computers and the like. Generally, a battery cell includes a case, an electrode assembly, tabs, and an electrolyte filled in the case. Wherein one end of the tab is fixed to the electrode assembly and the other end of the tab protrudes out of the case.

When the electric core or the electronic equipment comprising the electric core falls and other accidents happen, the stress of the part of the lug between the electrode assembly and the shell is concentrated, and then the part is easy to break, so that the electric core cannot normally work and other defects are caused.

[ summary of the invention ]

The embodiment of the application aims at providing a battery cell and an electric device so as to reduce the risk that the part of a tab of the battery cell between an electrode assembly and a shell is easy to break at present.

The embodiment of the application solves the technical problem, and adopts the following technical scheme:

a battery cell comprises a shell, an electrode assembly and a tab. The electrode assembly is housed in the case. The tab includes a first portion, a second portion, and a third portion. Wherein the first portion is located within the housing and mounted to the electrode assembly. The second portion is located outside the electrode assembly, and one end of the second portion is connected to the first portion. One end of the third part is connected with the other end of the second part, and the other end of the third part extends out of the shell. The thickness of the second part is larger than that of the first part, and the ratio of the thicknesses of the second part and the first part is between 1.1 and 1.6.

Some electric cores on the existing market increase the thickness of utmost point ear through whole to promote the holistic shock resistance of utmost point ear, and then reduce above-mentioned risk. However, the thickness of the part of the tab on the electrode assembly is increased by the scheme, so that the overall energy density of the battery cell is influenced; in addition, the scheme can also lead the local parts of the pole pieces or the isolating films adjacent to the pole lugs in the electrode assembly to be extruded and deformed, thereby further leading the surfaces of the pole pieces to be damaged. Compared with the prior art, the battery cell provided by the embodiment of the application has the advantages that the area of the longitudinal section (i.e. the section in the direction perpendicular to the extending direction of the tab) of the tab at the second part is increased, so that the impact resistance of the tab at the second part is better; meanwhile, the thickness of the tab at the first part is not required to be increased, so that on one hand, the integral energy density of the battery cell can be prevented from being reduced, and on the other hand, the risk of damaging the surface of the pole piece can be reduced. That is, the cell provided by the embodiment of the application can reduce the risk that the part of the tab of the current cell between the electrode assembly and the casing is easy to break, and meanwhile, the energy density of the cell is not affected.

As a further improvement of the scheme, the thickness ratio of the second part to the first part is between 1.2 and 1.5.

As a further improvement of the above, the thickness of the first part is between 70 and 90 μm, and the thickness of the second part is between 90 and 110 μm.

As a further improvement of the above, the thickness of the third portion is greater than the thickness of the first portion; and/or the second portion conforms to the thickness of the third portion.

As a further improvement of the above aspect, both end faces of the first portion are located between both end faces of the second portion in the thickness direction of the tab. The symmetrical structure design can improve the mechanical property of the pole lug to a certain extent.

As a further improvement of the above, the width of the second portion is greater than the width of the third portion. Therefore, the area of the cross section of the second part is further increased, so that the impact force borne by the second part can be better dispersed, and the overall impact resistance of the tab is improved.

As a further improvement of the scheme, the width ratio of the second part to the third part is between 1.1 and 1.6.

As a further improvement of the scheme, the width ratio of the second part to the third part is between 1.2 and 1.5.

As a further improvement of the above, the width between the second portion and the first portion is the same.

As a further improvement of the above, the width of the second portion is greater than the width of the first portion.

As a further improvement of the above solution, the surface of the second part is provided with a fluorocarbon coating to further improve the impact resistance of the second part. The fluorocarbon coating can be obtained by fluorocarbon spraying treatment.

As a further improvement of the above, the housing includes a main body portion and a sealing portion. The electrode assembly is accommodated in the main body part, a sealing part is formed by extending outwards from the edge of the main body part, and the tab extends out of the shell through the sealing part.

As a further improvement of the above scheme, the tab connector further comprises a sealant at least partially arranged on the sealing portion to seal the connection between the sealing portion and the tab. The sealant is arranged around the tab and covers at least part of the second portion, and/or the sealant is arranged around the tab and covers at least part of the third portion.

As a further development of the above, at least part of the second portion is arranged in the seal.

Another embodiment of this application still provides an electric device, includes any kind of above-mentioned electric core.

[ description of the drawings ]

One or more embodiments are illustrated in drawings corresponding to, and not limiting to, the embodiments, in which elements having the same reference number designation may be represented as similar elements, unless specifically noted, the drawings in the figures are not to scale.

Fig. 1 is a schematic perspective view of a battery cell according to an embodiment of the present disclosure;

fig. 2 is a schematic cross-sectional view of the battery cell of fig. 1 along line a-a;

FIG. 3 is a schematic view of FIG. 2 with the sealant hidden;

fig. 4 is a front view of the tab of fig. 1;

fig. 5 is a side view of the tab of fig. 4;

fig. 6 is a front view of a tab provided by another embodiment of the present application;

fig. 7 is a side view of the tab of fig. 6;

fig. 8 is a front view of a tab provided in accordance with yet another embodiment of the present application;

fig. 9 is a side view of the tab of fig. 8;

fig. 10 is a schematic view of an electric device according to an embodiment of the present disclosure.

In the figure:

1. an electric core;

100. a housing; 110. a main body portion; 120. a sealing part;

200. an electrode assembly;

300. a tab; 310. a first portion; 320. a second portion; 330. a third portion; 340. sealing glue;

300b, pole lugs; 310b, a first portion; 320b, a second portion; 330b, a third portion;

300c, pole lugs; 310c, a first portion; 320c, a second portion; 330c, a third portion;

2. and (4) a power utilization device.

[ detailed description ] embodiments

In order to facilitate an understanding of the present application, the present application is described in more detail below with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is referred to as being "fixed to"/"mounted to" another element, it can be directly on the other element or one or more intervening elements may be present therebetween. 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 be present. The terms "vertical," "horizontal," "left," "right," "inner," "outer," and the like as used herein are for descriptive 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 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 "and/or" includes any and all combinations of one or more of the associated listed items.

In addition, the technical features mentioned in the different embodiments of the present application described below may be combined with each other as long as they do not conflict with each other.

In this specification, the term "mount" includes welding, screwing, clipping, adhering, etc. to fix or restrict a certain element or device to a specific position or place, the element or device may be fixed or movable in a limited range in the specific position or place, and the element or device may be dismounted or not dismounted after being fixed or restricted to the specific position or place, which is not limited in the embodiment of the present application.

Referring to fig. 1 to fig. 5, a schematic perspective view of a battery cell 1, two cut-away schematic views of the battery cell 1 along a line a-a, and schematic front and side views of a tab 300 according to an embodiment of the present disclosure are respectively shown, where the battery cell 1 includes a casing 100, an electrode assembly 200, and a tab 300. The electrode assembly 200 is housed in the case 100; one end of the tab 300 is fixed to the electrode assembly 200 and the other end protrudes out of the case 100.

Referring to fig. 1 to 3, the casing 100 is a flat rectangular parallelepiped, and a cavity (not shown) is disposed inside the casing 100 and is used for accommodating the electrode assembly 200 and the electrolyte. In this embodiment, the battery cell 1 is a soft-package battery cell, that is, the casing 100 is an aluminum-plastic film. Specifically, the housing 100 includes a main body portion 110 and a sealing portion 120. The receiving cavity is formed in the body 110, and the electrode assembly 200 is received in the receiving cavity. The sealing part 120 is a sheet structure formed to extend outward from the edge of the body part 110; the sealing part 120 is a sealing part in the process of molding the case 100, and the tab 300 is protruded out of the case 100 through the sealing part 120. It is understood that in other embodiments of the present application, the battery cell 1 may also be a hard shell battery cell.

Referring to fig. 2 and 3, the electrode assembly 200 is accommodated in the accommodating cavity, and includes a first pole piece (not shown), a second pole piece (not shown) and an isolation film (not shown) stacked in layers. The first pole piece and the second pole piece are opposite in polarity and are arranged at intervals, one of the first pole piece and the second pole piece is a positive pole piece, and the other one of the first pole piece and the second pole piece is a negative pole piece; the isolating film is arranged between the two and is used for separating the two. The first pole piece, the second pole piece and the isolating film are arranged in a laminated mode and wound into a columnar structure with an oval or elliptical cross section, and therefore the pole piece can be accommodated in the accommodating cavity conveniently. It is to be understood that even though the electrode assembly 200 in the present embodiment is a winding type electrode assembly, the present application is not limited thereto; in other embodiments of the present application, the electrode assembly 200 may also be a laminated electrode assembly. The casing 100 is further filled with an electrolyte, the electrode assembly 200 is soaked in the electrolyte, and the electrolyte is used for providing an environment for lithium ion conduction, so that lithium ions can be timely embedded into the first pole piece or the second pole piece, thereby realizing the charge and discharge process of the battery cell 1.

Referring to fig. 4 and 5 in detail, and in conjunction with fig. 1 to 3, the tab 300 is integrally formed as a sheet structure, and includes a first portion 310, a second portion 320, and a third portion 330; the above-mentioned portions are represented by different oblique lines in the drawings for distinguishing the portions, which does not mean that the portions are formed separately, and generally, the first portion 310, the second portion 320 and the third portion 330 are formed integrally, but in some embodiments, the three portions may be formed separately and fixed together by welding or the like. Wherein the first portion 310 is located within the case 100 and mounted to the electrode assembly 200. Specifically, the first portion 310 has a strip-shaped sheet structure, one end of which is fixed to a pole piece of the electrode assembly 200 and the other end of which extends to an edge of the pole piece or out of the electrode assembly 200.

The second portion 320 is located outside the electrode assembly 200 with one end connected to the first portion 310 and the other end extending away from the first portion 310, and the second portion 320 has a thickness greater than that of the first portion 310. In this embodiment, an end of the second portion 320 facing away from the first portion 310 is disposed on the sealing portion 120 to be clamped and fixed by the sealing portion 120; it is understood that in other embodiments of the present application, the second portion 320 may be completely suspended between the electrode assembly 200 and the case 100. Since the second portion 320 of the tab 300 has the largest portion thereof suspended between the electrode assembly 200 and the case 100, the second portion 320 is easily broken due to the concentrated impact stress when an accident such as dropping of the battery cell 1 occurs. In the embodiment of the present application, the thickness of the second portion 320 is increased to increase the cross-sectional area thereof, so as to dissipate the impact force applied to the second portion 320; thus, the impact resistance of the tab 300 may be improved. Optionally, the ratio of the thicknesses of the second portion 320 and the first portion 310 is between 1.1 and 1.6, so that the second portion 320 has sufficient strength and the thickness of the second portion 320 is small, which avoids wasting material and avoids increasing difficulty in sealing with the sealing portion 120 due to too large thickness. Further optionally, the thickness ratio between the second portion 320 and the first portion 310 is between 1.2 and 1.5. Still further alternatively, the thickness of the first portion 310 is between 70 μm and 90 μm; accordingly, the thickness of the second portion 320 is between 77 μm and 144 μm, and preferably, the thickness of the second portion 320 is between 90 μm and 110 μm. For example, in some embodiments, the first portion 310 has a thickness of 80 μm and the second portion 320 has a thickness of 100 μm.

Preferably, the surface of the second portion 320 is provided with a fluorocarbon coating, and the fluorocarbon coating can be obtained by fluorocarbon spraying treatment to further improve the impact resistance of the second portion 320. In addition, the fluorocarbon coating can improve the mechanical strength and corrosion resistance of the second portion 320. Of course, in other embodiments of the present application, the surface of the first portion 310 and/or the third portion 330 may also be subjected to fluorocarbon spraying. It should be noted that, in the present embodiment, along the thickness direction X of the tab 300 (see fig. 5), both end surfaces of the first portion 310 are located between both end surfaces of the second portion, and the symmetric structural design can improve the mechanical property of the tab 300 to a certain extent; it should be understood that the relative position relationship between the first portion 310 and the second portion 320 is not limited thereto, and in other embodiments of the present application, one end surface of the first portion 310 may be flush with one end surface of the second portion 320.

The third portion 330 is connected to the second portion 320 at an end away from the first portion 310, and the other end extends out of the casing 100 through the sealing part 120 to form an external terminal of the battery cell 1. In this embodiment, an end of the second portion 320 facing away from the first portion 310 is disposed on the sealing portion 120 to maintain the fixation under the clamping action of the sealing portion 120; accordingly, the end of the third portion 330 that is connected to the second portion 320 is also provided at the seal 120, as shown in particular in FIG. 3. It is worth mentioning that the thickness of the third portion 330 is not limited in the present application; for example, in some embodiments, the third portion 330 is of a thickness consistent with the first portion 310; in this way, in the manufacturing process of the tab 300, both ends of the raw material of the tab 300 need to be processed respectively, and then the tab 300 is molded. For another example, in other embodiments, the thickness of the third portion 330 is greater than the thickness of the first portion 310. For example, in other embodiments, the thickness of the third portion 330 is greater than the thickness of the first portion 310 and corresponds to the thickness of the second portion 320; therefore, only one end of the raw material of the tab 300 needs to be processed in the manufacturing process of the tab 300, and the forming process of the tab 300 can be simplified. The thickness of the third portion 330 may also be less than the thickness of the first portion 310.

In this embodiment, the battery cell 1 includes two tabs 300, and the two tabs 300 have the same shape and are respectively connected to different pole pieces; it is understood that, in other embodiments of the present application, the battery cell 1 may further include only one tab 300 and one conventional tab, or include more than three tabs 300, and the number of the tabs is not specifically limited in the present application.

Further, in order to seal the joint between the tab 300 and the sealing portion 120 to prevent the electrolyte from overflowing to the outside of the casing 100 through the joint, the battery cell 1 further includes a sealant 340; at least a portion of the sealant 340 is disposed at the sealing part 120 to seal the connection between the tab 300 and the sealing part 120. In this embodiment, the sealant 340 is disposed around the tab 300 and covers at least a portion of the second portion 320 and at least a portion of the third portion 330 to seal the tab 300 to the housing 100. Preferably, along the extending direction of the tab 300, two ends of the sealant 340 are respectively disposed beyond two corresponding ends of the sealing portion 120, which is beneficial to increase the contact area between the sealant 340 and the tab 300 and the housing 100, thereby ensuring better sealing effect. It is understood that even though the sealant 340 covers at least portions of the second portion 320 and the third portion 330 at the same time in the embodiment, the application is not limited thereto; in other embodiments of the present application, the sealant 340 may cover only at least a portion of one of the second portion 320 and the third portion 330. In other embodiments, the connection between the second portion 320 and the third portion 330 is located between the outer edge of the sealing part 120 and the third portion 330 in the extending direction of the tab 300.

Even though the above embodiment is based on improving the impact resistance of the second portion 320 only by increasing the thickness thereof to improve the impact resistance of the entire tab 300, the present application is not limited thereto. For example, fig. 6 and 7 respectively show a front view and a side view of a tab 300b provided in another embodiment of the present application, where the tab 300b includes a first portion 310b, a second portion 320b and a third portion 330b, which are different from the tab 300 in the above embodiments in that: the width of the second portion 320b is greater than the width of the third portion 330 b. In this way, the cross-sectional area of the second portion 320b is further increased, so that the impact force applied to the second portion 320b can be better dispersed, and the overall impact resistance of the tab 300b can be improved. Optionally, the ratio of the width of the second portion 320 to the width of the third portion 330 is between 1.1 and 1.6. Further optionally, the ratio of the width of the second portion 320 to the width of the third portion 330 is between 1.2 and 1.5. For another example, fig. 8 and 9 respectively show a front view and a side view of a tab 300c provided in another embodiment of the present application, where the tab 300c includes a first portion 310c, a second portion 320c and a third portion 330c, which are different from the tab 300b described above mainly in that: the width of the second portion 320b of the tab 300b is greater than the width of the first portion 310 b; and the width between the second portion 320c and the first portion 310b of the tab 300c is the same. Since the increase in the width of the first portion 310 does not result in an increase in the thickness of the electrode assembly 200, and thus in a decrease in the energy density of the battery cell 1, the arrangement can further improve the impact resistance of the tab without decreasing the energy density of the battery cell 1. It is understood that, in other embodiments of the present application, the battery cell 1 may also improve the impact resistance of the tab 300 by only increasing the widths of the second portion 320 and the first portion 310 without changing the thickness of the second portion 320.

The battery cell 1 provided by the embodiment of the present application includes a casing 100, an electrode assembly 200, and tabs 300. The tab 300 includes a first portion 310 mounted to the electrode assembly 200, a second portion 320 received in the case 100 and located outside the electrode assembly 200, and a third portion 330 connected to the second portion 320 and extending out of the case 100. The ratio of the thickness of the second portion 320 to the thickness of the first portion 310 is between 1.1 and 1.6.

Some electric cores on the existing market increase the thickness of utmost point ear through whole to promote the holistic shock resistance of utmost point ear, and then reduce above-mentioned risk. However, the thickness of the tab on the electrode assembly is increased, which affects the energy density of the whole cell; in addition, the scheme can also lead the pole piece or the isolating film adjacent to the pole ear in the electrode component to be locally extruded and deformed, thereby leading the surface of the pole piece to be damaged. Compared with the prior art, the sectional area of the tab 300 in the second portion 320 in the battery cell 1 provided by the embodiment of the application is increased, so that the impact resistance of the tab 300 at the second portion 320 is better; meanwhile, the thickness of the tab 300 at the first portion 310 is not required to be increased, so that on one hand, the overall energy density of the battery cell 1 can be prevented from being reduced, and on the other hand, the risk of damaging the surface of the pole piece is reduced. That is, the battery cell 1 provided by the embodiment of the present application can reduce the risk that the part of the tab of the battery cell between the electrode assembly and the casing is easily broken at present.

Based on the same inventive concept, another embodiment of the present application further provides an electrical apparatus 2, specifically referring to fig. 10 in combination with fig. 1 to 9, where the electrical apparatus 2 includes the battery cell in the above embodiment. In this embodiment, the power consumption device 2 is a mobile phone; it is understood that, in other embodiments of the present application, the electric device 2 may also be a tablet computer, a drone or other electric devices that need to be driven by electricity.

Due to the inclusion of the battery cell 1 in the above embodiment, the electrical device 2 may also reduce the risk that the current portion of the tab of the battery cell between the electrode assembly and the casing is easily broken.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; within the context of the present application, where technical features in the above embodiments or in different embodiments can also be combined, the steps can be implemented in any order and there are many other variations of the different aspects of the present application as described above, which are not provided in detail for the sake of brevity; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.