Battery

A battery includes: a curved cell, having a first and second surfaces; a tab unit, connected to the cell and comprises a curved portion and a flat portion, the cell is curved along a direction perpendicular to an extending direction of the tab unit; and a package, including: a receiving portion and a flat encapsulating edge, the cell and the curved portion are received in the receiving portion, the receiving portion comprises a first receiving unit and a second receiving unit, radians of the first receiving unit and the second receiving unit are respectively matched with radian of the first surface and the second surface, and the flat portion is sealingly attached to the edge and penetrates outward from the edge. The battery provided by the embodiments of the present application has good cell reliability, and can realize the sealing attachment of the tab unit to the edge.

BACKGROUND

1. Technical Field

Embodiments of the present application relate to the field of batteries, and more particularly to a curved battery.

Secondary lithium batteries have been widely used in various electronic devices, and the demand for lithium batteries of various shapes is also increasing. For example, curved batteries have been used in a variety of devices such as human smart wearable devices, medical devices, mobile devices, and streamlined drones designed to reduce wind resistance. Accordingly, for a curved battery with an arc structure, a battery packaging bag with an arc structure is required to package the curved battery.

Therefore, regarding how to obtain a well-packaged curved battery by a simple and efficient process, there are still many technical problems to be solved in the industry.

SUMMARY

One of the objectives of the embodiments of the present application is to provide a battery that may be packaged conveniently and efficiently and has good cell reliability.

A battery according to one embodiment of the present application includes: a curved cell, having a first surface and a second surface opposite to the first surface; a tab unit, connected to the cell including a curved portion and a flat portion; and a package, including: a receiving portion including a first receiving unit and a second receiving unit opposite to the first receiving unit and a flat encapsulating edge surrounding the receiving portion; wherein the cell is curved along a direction perpendicular to an extending direction of the tab unit; the cell and the curved portion are received in the receiving portion. A radians of the first receiving unit and a radians of the second receiving unit are respectively matched with a radian of the first surface of the cell and a radian of the second surface of the cell, and the flat portion of the tab unit is sealingly attached to the flat encapsulating edge of the package and penetrates outward from the flat encapsulating edge.

In some embodiments of the present application, the first receiving unit has a first depth that varies depending on its position in a height direction of the battery, the second receiving unit has a second depth at the position corresponding to the first depth, a sum of the first depth and the corresponding second depth is equal to a thickness of the cell, wherein dimensions of the first receiving unit and the second receiving unit in their length direction, width direction and height direction are respectively greater than dimensions of the cell in its length direction, width direction and height direction.

In some embodiments of the present application, the flat encapsulating edge includes a first seal edge along a width direction of the battery, a second seal edge sealingly attached to the first seal edge, a third seal edge intersecting the first seal edge along a length direction of the battery, and a fourth seal edge sealingly attached to the third seal edge, wherein the flat portion of the tab unit is sealingly attached between the first seal edge and the second seal edge and penetrates outward from between the first seal edge and the second seal edge.

In some embodiments of the present application, each of the first seal edge and the second seal edge has a width of about 0.8 mm to 3 mm.

In some embodiments of the present application, each of the third seal edge and the fourth seal edge has a width of about 4 mm to 6 mm.

In some embodiments of the present application, the flat encapsulating edge is located in a plane between the first surface and the second surface.

In some embodiments of the present application, the first receiving unit and the second receiving unit are integrally formed.

In some embodiments of the present application, the first receiving unit and the second receiving unit are separated.

In some embodiments of the present application, the cell includes a first electrode plate, a second electrode plate and an isolation film located between the first electrode plate and the second electrode plate, the first electrode plate is provided with a first tab, and the second electrode plate is provided with a second tab.

In some embodiments of the present application, the flat encapsulating edge includes a first seal edge along a width direction of the battery, a second seal edge sealingly attached to the first seal edge, a third seal edge parallel to the first seal edge along the width direction of the battery, and a fourth seal edge sealingly attached to the third seal edge, wherein the flat portion of the tab unit is sealingly attached between the first seal edge and the second seal edge and penetrates outward from between the first seal edge and the second seal edge.

In some embodiments of the present application, each of the first seal edge, the second seal edge, the third seal edge and the fourth seal edge has a width of about 0.8 mm to 3 mm.

In some embodiments of the present application, the flat encapsulating edge includes a first seal edge along a width direction of the battery, a second seal edge sealingly attached to the first seal edge, a third seal edge parallel to the first seal edge along the width direction of the battery, a fourth seal edge sealingly attached to the third seal edge, a fifth seal edge intersecting the first seal edge and the third seal edge along a length direction of the battery, and a sixth seal edge sealingly attached to the fifth seal edge, a portion of the flat portion of the tab unit is sealingly attached between the first seal edge and the second seal edge and penetrates outward from between the first seal edge and the second seal edge, and a portion of the flat portion of the tab unit is sealingly attached between the third seal edge and the fourth seal edge and penetrates outward from between the third seal edge and the fourth seal edge.

In some embodiments of the present application, each of the first seal edge, the second seal edge, the third seal edge and the fourth seal edge has a width of about 0.8 mm to 3 mm.

In some embodiments of the present application, each of the fifth seal edge and the sixth seal edge has a width of about 4 mm to 6 mm.

In some embodiments of the present application, the package further includes a first portion connected to the first receiving unit and the first seal edge, and a second portion connected to the second receiving unit and the second seal edge.

In some embodiments of the present application, the first portion and the second portion are air bags, a dimension of the first portion in the width direction of the battery and a dimension of the second portion in the width direction of the battery are substantially equal.

In some embodiments of the present application, the package further includes a first portion connected to the first receiving unit, the first seal edge and the third seal edge, and a second portion connected to the second receiving unit, the second seal edge and the fourth seal edge.

In some embodiments of the present application, the first portion and the second portion are air bags, a dimension of the first portion in the width direction of the battery and a dimension of the second portion in the width direction of the battery are substantially equal.

In some embodiments of the present application, the package further includes a first portion connected to the first receiving unit, the first seal edge and the third seal edge, and a second portion connected to the second receiving unit.

In some embodiments of the present application, the first portion and the second portion are air bags, a dimension of the first portion in the width direction of the battery and a dimension of the second portion in the width direction of the battery are substantially equal.

According to the battery provided by the embodiments of the present application, the tab unit of the battery may be sealingly attached to the flat encapsulating edge of the package, and it is not necessary to manufacture the encapsulation edge of the package to be in arc shape, thereby realizing the simple and efficient packaging of the curved battery. Moreover, the battery provided by the embodiments of the present application also has good cell reliability.

DETAILED DESCRIPTION

Embodiments of this application are described below in detail. Throughout the entire specification of this application, the same or similar components or components having the same or similar functions are represented by using similar reference numerals. The embodiments related to the accompanying drawings that are described herein are illustrative and schematic, and are used to provide basic understanding for this application. The embodiments of this application should not be construed as limitations to this application.

In this specification, unless otherwise particularly indicated or limited, relativistic wordings such as “central”, “longitudinal”, “lateral”, “front”, “back”, “right”, “left”, “inner”, “outer”, “relatively low”, “relatively high”, “horizontal”, “vertical”, “higher than”, “lower than”, “above”, “below”, “top”, “bottom”, and derived wordings thereof (such as “horizontally”, “downward”, and “upward”) should be construed as referenced directions described in discussion or shown in the accompanying drawings. These relativistic wordings are merely for ease of description, and require constructing or operating this application in a particular direction.

As used in this application, terms “about”, “roughly”, “substantially”, “essentially”, and “approximately” are used for describing and explaining a small variation. When being used in combination with an event or a case, the terms may refer to an example in which the event or case exactly occurs, or an example in which the event or case similarly occurs. For example, when being used in combination with a value, the terms may refer to a variation range being less than or equal to ±10% of the value, for example, less than or equal to ±5%, less than or equal to ±4%, less than or equal to ±3%, less than or equal to ±2%, less than or equal to ±1%, less than or equal to ±0.5%, less than or equal to ±0.1%, or less than or equal to ±0.05%. For example, if a difference between two values is less than or equal to ±10% of an average value of the values (for example, less than or equal to ±5%, less than or equal to ±4%, less than or equal to ±3%, less than or equal to ±2%, less than or equal to ±1%, less than or equal to ±0.5%, less than or equal to ±0.1%, or less than or equal to ±0.05%), it could be considered that the two values are “substantially” the same or “approximate”.

Furthermore, in order to facilitate description, “first”, “second”, “third” and the like may be used herein for distinguishing different components of one figure or a series of figures. “First”, “second”, “third” and the like are not intended to describe corresponding components.

In the present application, otherwise specifically assigned or limited, “dispose”, “connect”, “couple”, “fix” and words similar to them are wide in use, and those skilled in the art may understand the above words according to specific conditions, such as, fixed connection, detachable connection or integrated connection; it may also be mechanical connection or electrical connection; it may also be direct connection or indirect connection through an intermediary structure; and it may also be inner communication of two components.

In order to adapt to the arc shape of a curved cell, a packaging bag with an arc structure may be manufactured to receive the curved cell, wherein a sealing surface of the packaging bag also needs to be manufactured into a corresponding arc shape to adapt to a tab in an arc shape. However, in an actual manufacturing process, it is not easy to shape the sealing surface of the packaging bag to adapt to the arc shape of the tab. Such a forming process has low production efficiency and low product yield.

In view of the above, the present application designs a special structure of the tab unit so that the tab unit can be hermetically attached to the flat sealing surface of the packaging bag, thereby obtaining a curved battery in a convenient packaging process.

FIG.1ashows a structural schematic diagram of a cell100according to an embodiment of the present application. As shown inFIG.1a, the cell100according to an embodiment of the present application includes: a first surface101and a second surface103opposite to the first surface101. Each of the first surface101and the second surface103is a curved surface having a radian.

The cell100has a length direction X, a width direction Y perpendicular to the length direction X, and a thickness direction Z perpendicular to a plane where the length direction X and the width direction Y are located. The cell100has a length L along the length direction X, a width W along the width direction Y, and a thickness H along the thickness direction Z. The cell100is formed by winding a first electrode plate (not shown in the figures) and a second electrode plate (not shown in the figures). An isolation film (not shown in the figures) is provided between the first electrode plate and the second electrode plate. The first electrode plate is provided with a first tab105, and the second electrode plate is provided with a second tab107. The first tab105includes a curved portion105aand a flat portion105b. The second tab107includes a curved portion107aand a flat portion107b. The first tab105and the second tab107together form a tab unit109connected to the cell100.

The cell100is curved along a direction perpendicular to an extending direction of the tab unit109. That is, the cell100is curved along the width direction Y. Curving the cell100along the width direction Y has more significant advantages than curving the cell100along the length direction X. Since the cell100is formed by winding the electrode plates along the width direction Y, the plurality of electrode plates of the cell100are structurally looser in the width direction Y and provides larger flexibility. Curving the cell100along the longitudinal direction X needs to curve a plurality of electrode plates in the longitudinal direction X, which requires strong force because the curving direction is different from the winding direction of the electrode plates. Such a curving manner easily causes damage to the electrode plates, and thus decreases the reliability of the cell. In addition, if the tensile strength is greater than the ductility of the electrode plates, the electrode plates tend to break. In order to improve the reliability of the cell, in the embodiment of the present application, the cell100is curved along a winding direction of the electrode plates. That is, the curving direction is in a direction perpendicular to the extending direction of the tab unit109. Such a curving manner in the embodiment may not only reduce or even avoid the breakage of the electrode plates, but also improves the reliability of the cell100.

In order to match the curved cell100, a receiving portion of the package that encapsulates the cell is also generally manufactured to be in a curved shape, and the packaging edge of the package is also manufactured to be curved. However, forming process of the packaging edge of the curved package is very complicated and has lower reliability. In this application, an arc-shaped package of which the encapsulation edge is horizontal and a receiving portion matches the curved cell is used to facilitate battery cell packaging.

However, curving the cell100along the width direction Y shown inFIG.1awill cause the first tab105and the second tab107on the cell100to be curved accordingly. This makes the first tab105and the second tab107incapable of being sealingly attached to the flat encapsulating edge of the package of the cell100.

FIG.1bshows a schematic diagram at the time of forming the cell100shown inFIG.1a. As shown inFIG.1b, after the cell100is curved along the width direction Y shown inFIG.1a, the first tab105and the second tab107are also curved accordingly to exhibit an arc shape.

By adopting a curving process according to the embodiment of the present application, the first tab105and the second tab107are curved so that the first tab105includes a curved portion105aand a flat portion105bas shown inFIG.1a, and the second tab107includes a curved portion107aand a flat portion107bas shown inFIG.1a. Therefore, the flat portion105bof the first tab105and the flat portion107bof the second tab107may be sealingly attached to the horizontal encapsulation edge of the package of the cell100, thereby meeting the requirements for the sealing attachment of the horizontal encapsulation edge of the package of the cell100.

Therefore, the cell100provided by the embodiment of the present application may realize the sealing attachment of the tab unit109of the cell100to the flat encapsulating edge of the package while having good cell reliability, and avoids the process of manufacturing the horizontal encapsulation edge of the package into an arc, thereby realizing convenient and efficient packaging of the curved battery.

FIG.2ashows a front schematic diagram of a package200according to an embodiment of the present application.FIG.2bshows a rear schematic diagram of the package200shown inFIG.2a. As shown inFIG.2aandFIG.2b, the package200includes a receiving portion201and a flat encapsulating edge203surrounding the receiving portion201.

The material of the package200is a material of a packaging bag of a cell commonly used in the field, such as polypropylene, polyphthalamide, polyamide, or the like.

The receiving portion201includes a first receiving unit201aand a second receiving unit201bopposite to the first receiving unit201a. The radians of the first receiving unit201aand the radians of the second receiving unit201bare respectively matched with the radian of the first surface101of the cell100and the radian of the second surface103of the cell100. The first receiving unit201ahas a first depth that varies depending on its position in the thickness direction Z of the cell100, the second receiving unit201bhas a second depth at the position corresponding to the first depth, and the sum of the first depth and the corresponding second depth is equal to the thickness H of the cell100. The first receiving unit201aand the second receiving unit201brespectively have widths W1and W2in the width direction Y, and W1=W2. The first receiving unit201aand the second receiving unit201brespectively have lengths L1and L2in the length direction X, and L1=L2. The first receiving unit201aand the second receiving unit201brespectively have thicknesses in the thickness direction Z. The dimensions of the first receiving unit201aand the dimensions of the second receiving unit201bin the length direction X, the width direction Y and the thickness direction Z are respectively greater than dimensions of the cell100in the length direction X, the width direction Y and the thickness direction Z. The length L1of the first receiving unit201aand the length L2of the second receiving unit201bare respectively greater than the length L of the cell100by about 0.6 mm. The width W1of the first receiving unit201aand the width W2of the second receiving unit201bare respectively greater than the width W of the cell100by about 0.6 mm. In other embodiments of the present application, the length L1of the first receiving unit201aand the length L2of the second receiving unit201bare respectively greater than the length L of the cell100by any suitable dimension. The width W1of the first receiving unit201aand the width W2of the second receiving unit201bare respectively greater than the width W of the cell100by any suitable dimension. The first receiving unit201aand the second receiving unit201bare integrally formed. In other embodiments of the present application, the first receiving unit201aand the second receiving unit201bare separated.

The flat encapsulating edge203includes a first seal edge203aalong the width direction Y, a second seal edge203bsealingly attached to the first seal edge203a, a third seal edge203cintersecting the first seal203aalong the length direction X, and a fourth seal edge203dsealingly attached to the third seal edge203c. The first receiving unit201aand/or the second receiving unit201bmay be folded along a fold line205, such that by a thermocompression bonding sealing process, the first seal edge203ais sealingly attached to the second seal edge203b, and the third seal edge203cis sealingly attached to the fourth seal edge203d. The first seal edge203ahas a width B1, the second seal edge203bhas a width B2, and B1=B2=about 0.8 mm. The third seal edge203chas a width B3, the fourth seal edge203dhas a width B4, and B3=B4=about 4 mm. In other embodiments of the present application, the first seal edge203aand the second seal edge203bhave a width dimension ranging from about 0.8 mm to about 3 mm, and the third seal edge203cand the fourth seal edge203dhave a width dimension ranging from about 4 mm to about 6 mm.

The package200further includes a first portion207aconnected to the first receiving unit201aand the first seal edge203a, and a second portion207bconnected to the second receiving unit201band the second seal edge203b. The first portion207aand the second portion207bmay be air bags. The dimension C1of the first portion207ain the width direction Y and the dimension C2of the second portion207bin the width direction Y are substantially equal, and the values of the dimension C1and the dimension C2are set according to the amount of exhaust of the cell100. The first receiving unit201aand/or the second receiving unit201bmay be folded along the fold line205, and by a thermocompression bonding sealing process, the first portion207ais sealingly attached to the second portion207b. Further, after the thermocompression bonding sealing of the first portion207aand the second portion207b, at least a portion of the first portion207aand at least a portion of the second portion207bmay be cut away, such that the dimension C1of the remaining first portion207ain the width direction Y and the dimension C2of the remaining second portion207bin the width direction Y are substantially equal, and the dimension C1and the dimension C2range from about 0.8 mm to about 6 mm. In other embodiments of the present application, the first portion207aand the second portion207bmay be flat encapsulating edges, the dimension C1of the first portion207ain the width direction Y and the dimension C2of the second portion207bin the width direction Y are substantially equal, and the dimension C1and the dimension C2range from about 0.8 mm to about 6 mm.

FIG.3ashows a schematic diagram when the cell100shown inFIG.1ais ready to be placed in the package200shown inFIG.2a.FIG.3bshows a schematic diagram when the package shown inFIG.2ais curved after the cell100shown inFIG.1ais placed in the package200shown inFIG.2a.FIG.3cshows a schematic diagram of a battery300obtained after the cell100shown inFIG.1ais placed in the package200shown inFIG.2a.

As shown inFIG.3a, the cell100is placed in the first receiving unit201aof the receiving portion201of the package200, and the radian of the first surface101of the cell100is matched with that of the first receiving unit201aof the receiving portion201of the package200.

As shown inFIG.3b, the second receiving unit201bis folded along the fold line205.

As shown inFIG.3c, by a thermocompression bonding sealing process, the first seal edge203aof the package200is sealingly attached to the second seal edge203bof the package200, the third seal edge203cof the package200is sealingly attached to the fourth seal edge203dof the package200, and the first portion207aand the second portion207bare sealingly attached to obtain the packaged battery300. The flat portions105band107bof the tab unit109are sealingly attached between the first seal edge203aand the second seal edge203b, and penetrate outward from between the first seal edge203aand the second seal edge203b. The cell100and the curved portions105aand107aof the tab unit109are received in the receiving portion201. The flat encapsulating edge203is located in a plane between the first surface101and the second surface103of the cell100. The first surface101of the cell100is substantially completely fitted with the first receiving unit201aof the receiving portion201of the package200. The second surface103of the cell100is substantially completely fitted with the second receiving unit201bof the receiving portion201of the package200.

Next, after the battery300as shown inFIG.3cis obtained, at least a portion of the first portion207aas one air bag and at least a portion of the second portion207bas one air bag may be cut away, such that the dimension C1of the remaining first portion207aalong the width direction Y and the dimension C2of the remaining second portion207balong the width direction Y are substantially equal, and the dimension C1and the dimension C2range from about 0.8 mm to about 6 mm.

Since the cell100of the battery300provided by the embodiment of the present application is curved along a direction perpendicular to the extending direction of the tab unit109, it has better cell reliability. Moreover, the tab unit109of the cell100may be sealingly attached to the flat encapsulating edge of the package200, and it is not necessary to manufacture the encapsulation edge of the package200to be in arc shape, thereby realizing the simple and efficient packaging of the curved battery. Therefore, the battery300provided by the embodiment of the present application has many advantages such as high cell reliability, simple packaging process, high productivity and the like.

FIG.4shows a schematic diagram when the cell100shown inFIG.1ais ready to be placed in a package400according to another embodiment of the present application to obtain a battery300′ according to another embodiment of the present application. The battery300′ includes the package400and the cell100.

The material of the package400is a material of a packaging bag of a cell commonly used in the field, such as polypropylene, polyphthalamide, polyamide, or the like.

The package400includes a receiving portion401and a flat encapsulating edge403surrounding the receiving portion401.

The receiving portion401includes a first receiving unit401aand a second receiving unit401bopposite to the first receiving unit401a. The radians of the first receiving unit401aand the radians of the second receiving unit401bare respectively matched with the radian of the first surface101of the cell100and the radian of the second surface103of the cell100. The first receiving unit401ahas a first depth that varies depending on its position in the thickness direction Z of the cell100. The second receiving unit401bhas a second depth at the position corresponding to the first depth. The sum of the first depth and the corresponding second depth is equal to the thickness H of the cell100. The first receiving unit401aand the second receiving unit401brespectively have widths W1′ and W2′ in the width direction Y, and WP=W2′. The first receiving unit401aand the second receiving unit401brespectively have lengths L1′ and L2′ in the length direction X, and L1′=L2′. The first receiving unit401aand the second receiving unit401brespectively have thicknesses in the thickness direction Z. The dimensions of the first receiving unit401aand the dimensions of the second receiving unit401bin the length direction X, the width direction Y and the thickness direction Z are respectively greater than dimensions of the cell100in the length direction X, the width direction Y and the thickness direction Z. The length L1′ of the first receiving unit401aand the length L2′ of the second receiving unit401bare respectively greater than the length L of the cell100by about 0.6 mm. The width W1′ of the first receiving unit401aand the width W2′ of the second receiving unit401bare respectively greater than the width W of the cell100by about 0.6 mm. In other embodiments of the present application, the length L1′ of the first receiving unit401aand the length L2′ of the second receiving unit401bare respectively greater than the length L of the cell100by any suitable dimension. The width W1′ of the first receiving unit401aand the width W2′ of the second receiving unit401bare respectively greater than the width W of the cell100by any suitable dimension. The first receiving unit401aand the second receiving unit401bare integrally formed. In other embodiments of the present application, the first receiving unit401aand the second receiving unit401bare separated.

The flat encapsulating edge403includes a first seal edge403aalong the width direction Y, a second seal edge403bsealingly attached to the first seal edge403a, a third seal edge403cparallel to the first seal403aalong the width direction Y, and a fourth seal edge403dsealingly attached to the third seal edge403c. The first receiving unit401aand/or the second receiving unit401bmay be folded along a fold line405, such that by a thermocompression bonding sealing process, the first seal edge403ais sealingly attached to the second seal edge403b, and the third seal edge403cis sealingly attached to the fourth seal edge403d. The first seal edge403ahas a width B1′, the second seal edge403bhas a width B2′, the third seal edge403chas a width B3′, the fourth seal edge403dhas a width B4′, and B1′=B2′=B3′=B4′=about 0.8 mm. In other embodiments of the present application, the first seal edge403a, the second seal edge403b, the third seal edge403c, and the fourth seal edge403dhave a width dimension ranging from about 0.8 mm to about 3 mm.

The package400further includes a first portion407aconnected to the first receiving unit401a, the first seal edge403aand the third seal edge403c, and a second portion407bconnected to the second receiving unit401b, the second seal edge403band the fourth seal edge403d. The first portion407aand the second portion407bmay be air bags. The dimension C1′ of the first portion407aalong the width direction Y and the dimension C2′ of the second portion407balong the width direction Y are substantially equal, and the values of the dimension C1′ and the dimension C2′ are set according to the amount of exhaust of the cell100. The first receiving unit401aand/or the second receiving unit401bmay be folded along the fold line405, such that by a thermocompression bonding sealing process, the first portion407ais sealingly attached to the second portion407b. Further, after the thermocompression bonding sealing of the first portion407aand the second portion407b, at least a portion of the first portion407aand at least a portion of the second portion407bmay be cut away, such that the dimension C1′ of the remaining first portion407aalong the width direction Y and the dimension C2′ of the remaining second portion407bin along the width direction Y are substantially equal, and the dimension C1′ and the dimension C2′ range from about 0.8 mm to about 6 mm. In other embodiments of the present application, the first portion407aand the second portion407bmay be flat encapsulating edges, the dimension C1′ of the first portion407aalong the width direction Y and the dimension C2′ of the second portion407balong the width direction Y are substantially equal, and the dimension C1′ and the dimension C2′ range from about 0.8 mm to about 6 mm.

By a thermocompression bonding sealing process, the first seal edge403aof the package400is sealingly attached to the second seal edge403bof the package400, the third seal edge403cof the package400is sealingly attached to the fourth seal edge403dof the package400, and the first portion407aand the second portion407bare sealingly attached to obtain the packaged battery300′. The flat portions105band107bof the tab unit109are sealingly attached between the first seal edge403aand the second seal edge403band penetrate outward from between the first seal edge403aand the second seal edge403b, and the cell100and the curved portions105aand107aof the tab unit109are received in the receiving portion401. The flat encapsulating edge403is located in a plane between the first surface101and the second surface103of the cell100. The first surface101of the cell100is substantially completely fitted with the first receiving unit401aof the receiving portion401of the package400, and the first surface103of the cell100is substantially completely fitted with the second receiving unit401bof the receiving portion401of the package400.

At least a portion of the first portion407aas one air bag and at least a portion of the second portion407bas one air bag may be cut away, such that the dimension C1′ of the remaining first portion407aalong the width direction Y and the dimension C2′ of the remaining second portion407balong the width direction Y are substantially equal, and the dimension C1′ and the dimension C2′ range from about 0.8 mm to about 6 mm.

Since the cell100of the battery300′ provided by the embodiment of the present application is curved along a direction perpendicular to the extending direction of the tab unit109, it has better cell reliability. Moreover, the tab unit109of the cell100may be sealingly attached to the flat encapsulating edge of the package400, and it is not necessary to manufacture the encapsulation edge of the package400to be in arc shape, thereby realizing the simple and efficient packaging of the curved battery. Therefore, the battery300′ provided by the embodiment of the present application has many advantages such as high cell reliability, simple packaging process, high productivity and the like.

FIG.5shows a structural schematic diagram of a cell500according to another embodiment of the present application. As shown inFIG.5, the cell500shown inFIG.5is different from the cell100shown inFIG.1in that: a first tab505and a second tab507of the cell500are respectively located on two opposite sides.

FIG.6shows a schematic diagram when the cell500shown inFIG.5is ready to be placed in a package600according to another embodiment of the present application to obtain a battery300″ according to another embodiment of the present application. The battery300″ includes the package600and the cell500.

The material of the package600is a material of a packaging bag of a cell commonly used in the field, such as polypropylene, polyphthalamide, polyamide, or the like.

The package600includes a receiving portion601and a flat encapsulating edge603surrounding the receiving portion601.

The receiving portion601includes a first receiving unit601aand a second receiving unit601bopposite to the first receiving unit601a. The radians of the first receiving unit601aand the radians of the second receiving unit601bare respectively matched with the radian of a first surface501of the cell500and the radian of a second surface503of the cell500. The first receiving unit601ahas a first depth that varies depending on its position in the thickness direction Z of the cell500, the second receiving unit601bhas a second depth at the position corresponding to the first depth. The sum of the first depth and the corresponding second depth is equal to the thickness H′ of the cell500. The first receiving unit601aand the second receiving unit601brespectively have lengths L1″ and L2″ in the length direction X, and L1″=L2″. The first receiving unit601aand the second receiving unit601brespectively have widths W1″ and W2″ in the width direction Y, and W1″=W2″. The first receiving unit601aand the second receiving unit601brespectively have thicknesses in the thickness direction Z. The dimensions of the first receiving unit601aand the dimensions of the second receiving unit601bin the length direction X, the width direction Y and the thickness direction Z are respectively greater than dimensions of the cell500in the length direction X, the width direction Y and the thickness direction Z. The length L1″ of the first receiving unit601aand the length L2″ of the second receiving unit601bare respectively greater than the length L′ of the cell500by about 0.6 mm. The width W1″ of the first receiving unit601aand the width W2″ of the second receiving unit601bare respectively greater than the width W′ of the cell500by about 0.6 mm. In other embodiments of the present application, the length L1″ of the first receiving unit601aand the length L2″ of the second receiving unit601bare respectively greater than the length L′ of the cell500by any suitable dimension. The width W1′ of the first receiving unit601aand the width W2″ of the second receiving unit601bare respectively greater than the width W′ of the cell600by any suitable dimension. The first receiving unit601aand the second receiving unit601bare separated. In other embodiments of the present application, the first receiving unit601aand the second receiving unit601bare integrally formed.

The flat encapsulating edge603includes a first seal edge603aalong the width direction Y, a second seal edge603bsealingly attached to the first seal edge603a, a third seal edge603cparallel to the first seal edge603aalong the width direction Y, a fourth seal edge603dsealingly attached to the third seal edge603c, a fifth seal edge603eintersecting the first seal edge603aand the third seal edge603calong the length direction X, and a sixth seal edge603fsealingly attached to the fifth seal edge603e. By a thermocompression bonding sealing process, the first seal edge603ais sealingly attached to the second seal edge603b, the third seal edge603cis sealingly attached to the fourth seal edge603d, and the fifth seal edge603eis sealingly attached to the sixth seal edge603fThe first seal edge603ahas a width B1″, the second seal edge603bhas a width B2″, the third seal edge603chas a width B3″, the fourth seal edge603dhas a width B4″, and B1′=B2″=B3″=B4″=about 0.8 mm. The fifth seal edge603eand the sixth seal edge603fhave widths B5and B6, and B5=B6=about 4 mm. In other embodiments of the present application, the first seal edge603a, the second seal edge603b, the third seal edge603c, and the fourth seal edge603dhave a width dimension ranging from about 0.8 mm to about 3 mm, and the fifth seal edge603eand the sixth seal edge603fhave a width dimension ranging from about 4 mm to about 6 mm.

The package600further includes a first portion607aconnected to the first receiving unit601a, the first seal edge603aand the third seal edge603c, and a second portion607bconnected to the second receiving unit601b, the second seal edge603band the fourth seal edge603d. The dimension C1″ of the first portion607ain the width direction Y and the dimension C2″ of the second portion607bin the width direction Y are substantially equal, and the values of the dimension C1″ and the dimension C2″ are set according to the amount of exhaust of the cell500. By a thermocompression bonding sealing process, the first portion607amay be sealingly attached to the second portion607b. Further, after the thermocompression bonding sealing of the first portion607aand the second portion607b, at least a portion of the first portion607aand at least a portion of the second portion607bmay be cut away, such that the dimension C1″ of the remaining first portion607aalong the width direction Y and the dimension C2″ of the remaining second portion607balong the width direction Y are substantially equal, and the dimension C1″ and the dimension C2″ range from about 0.8 mm to about 6 mm. In other embodiments of the present application, the first portion607aand the second portion607bmay be flat encapsulating edges, the dimension C1″ of the first portion607aalong the width direction Y and the dimension C2″ of the second portion607balong the width direction Y are substantially equal, and the dimension C1″ and the dimension C2″ range from about 0.8 mm to about 6 mm.

By a thermocompression bonding sealing process, the first seal edge603aof the package600is sealingly attached to the second seal edge603bof the package600, the third seal edge603cof the package600is sealingly attached to the fourth seal edge603dof the package600, the fifth seal edge603eof the package600is sealingly attached to the sixth seal edge603fof the package600, and the first portion607aof the package600is sealingly attached to the second portion607bof the package600to obtain the packaged battery300″. A flat portion505bof a tab unit509composed of the first tab505and the second tab507is sealingly attached between the first seal edge603aand the second seal edge603band penetrates outward from between the first seal edge603aand the second seal edge603b, and a flat portion507bof the tab unit509composed of the first tab505and the second tab507is sealingly attached between the third seal edge603cand the fourth seal edge603dand penetrates outward from between the third seal edge603cand the fourth seal edge603d. The cell500and curved portions505aand507aof the tab unit509are received in the receiving portion601. The flat encapsulating edge603is located in a plane between the first surface501and the second surface503of the cell500, the first surface501of the cell500is substantially completely fitted with the first receiving unit601aof the receiving portion601of the package600, and the first surface503of the cell500is substantially completely fitted with the second receiving unit601bof the receiving portion601of the package600.

At least a portion of the first portion607aas one air bag and at least a portion of the second portion607bas one air bag may be further cut away, such that the dimension C1″ of the remaining first portion607aalong the width direction Y and the dimension C2″ of the remaining second portion607balong the width direction Y are substantially equal, and the dimension C1″ and the dimension C2″ range from about 0.8 mm to about 6 mm.

Since the cell500of the battery300″ provided by the embodiment of the present application is curved along a direction perpendicular to the extending direction of the tab unit509, it has better cell reliability. In addition, the tab unit509of the cell500may be sealingly attached to the flat encapsulating edge of the package600, and it is not necessary to manufacture the encapsulation edge of the package600to be in arc shape, thereby realizing the simple and efficient packaging of the curved battery. Therefore, the battery300″ provided by the embodiment of the present application has many advantages such as high cell reliability, simple packaging process, high productivity and the like.

The technical content and technical features of this application are disclosed above. However, persons skilled in the art may still make replacements and modifications based on the teachings and the disclosure of this application without departing from the spirit of this application. Therefore, the protection scope of this application should not be limited to the content disclosed in the embodiments, and should include various replacements and modifications without departing from this application, and is covered by the claims of this patent.