Soft package battery, battery pack and electronic device

Abstract

The utility model provides a soft package battery, which comprises a battery cell main body, an electrode assembly packaged by a packaging film, and a lead-out tab arranged in the length direction of the battery cell main body, the packaging film is provided with a first sealing edge for sealing the electrode assembly, the first sealing edge is arranged on at least one side of the battery cell main body in the width direction, and the first sealing edge is bent towards the direction close to the battery cell main body; and along the length direction, the first sealing edge is covered by a first adhesive tape from one end to the other end, so that the first sealing edge is bound on the battery cell main body. The utility model aims to provide a soft package battery, a battery pack and an electronic device so as to at least improve the flatness of the first sealing edge.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of soft package battery, battery pack and electronic device. BACKGROUND

[0002] With the development of new energy industry, lithium ion battery is widely used in life. Among them, due to policy support and environmental protection reasons, power battery is booming in the automotive industry. In order to ensure that electric vehicles and fuel vehicles have the same endurance mileage, the capacity of power battery is getting larger and larger, and the thickness is getting thicker and thicker. Power battery is divided into soft package battery, square can battery and cylindrical battery according to its shape difference. Among them, soft package battery is widely used due to its high energy density, high group rate and other characteristics. SUMMARY

[0003] In view of the problems in the related art, the utility model aims to provide a kind of soft package battery, battery pack and electronic device, to at least realize the flatness of the first sealing edge is improved.

[0004] To achieve the above object, the utility model provides a kind of soft package battery, comprising: the main body of electric core, including the electrode assembly encapsulated by packaging film, the length direction of the main body of electric core is the direction of lead-out tab;The first sealing edge of the packaging film has the electrode assembly, the first sealing edge is at the width direction of the main body of electric core at least one side, the first sealing edge is bent towards the direction close to the main body of electric core;Along the length direction, the first sealing edge is covered from one end to the other end by first adhesive tape, so that the first sealing edge is bound on the main body of electric core.

[0005] In some embodiments, the packaging film includes two layers of plastic insulation layer, and a metal sealing layer sandwiched in the two layers of plastic insulation layer, and the first adhesive tape covers the edge of the first sealing edge to insulate the metal sealing layer exposed by the edge.

[0006] In some embodiments, the packaging film also has a second sealing edge, the first sealing edge and the second sealing edge are located on the opposite sides of the main body of electric core along the width direction, and a plurality of second adhesive tapes bind the second sealing edge to the main body of electric core, the plurality of second adhesive tapes are separated from each other along the length direction.

[0007] In some embodiments, the packaging film also has a second sealing edge, the first sealing edge and the second sealing edge are located on the opposite sides of the main body of electric core along the width direction, and along the length direction, the second sealing edge is covered from one end to the other end by second adhesive tape, so that the second sealing edge is bound on the main body of electric core.

[0008] In some embodiments, the soft package battery further comprises: a positive tab and a negative tab, respectively connected to the positive and negative tabs of the electrode assembly, and the positive and negative tabs extend out from the packaging film, and in the length direction, the positive and negative tabs are located at two ends of the cell body, and in the length direction, the first adhesive tape exceeds and covers at least one of the one end and the other end of the first sealing edge to insulate the exposed metal sealing layer of the at least one of the one end and the other end.

[0009] In some embodiments, in the length direction, the first adhesive tape exceeds and covers one of the one end and the other end corresponding to the negative tab to insulate the exposed metal sealing layer of the one of the one end and the other end.

[0010] In some embodiments, the cell body has two opposite sides in the thickness direction, the first adhesive tape has an extension extending onto the two sides, the extension has a dimension d in the width direction, the cell body has a width w, and 0.01≤d / w≤0.15.

[0011] In some embodiments, the first adhesive tape has a thickness of 20-50 microns, the first adhesive tape comprises a substrate layer and a bonding layer, the bonding layer bonds the substrate layer and the packaging film, and the thickness ratio of the substrate layer and the bonding layer ranges from 1:1 to 1:4.

[0012] Embodiments of the present application also provide a battery pack comprising: a bottom plate; any of the above soft package batteries, the first sealing edge is arranged opposite to the bottom plate; and an adhesive layer, the first sealing edge is fixedly connected to the bottom plate through the adhesive layer.

[0013] Embodiments of the present application also provide an electronic device comprising the above battery pack.

[0014] The beneficial technical effects of the present application are as follows:

[0015] The first adhesive tape of the embodiments of the present application completely covers the first sealing edge in the length direction, which can avoid the first sealing edge from bulging / curving, and ensure the flatness of the first sealing edge, which is conducive to ensuring the uniformity of the thickness of the adhesive layer (which is also the distance between the soft package battery and the bottom plate) when the battery pack is subsequently integrated, and avoiding the adhesive layer from entering the gap between the first sealing edge and the cell body and affecting the insulation performance of the battery pack. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0017] Figure 1 A soft package battery of some embodiments of the prior art is shown.

[0018] Figure 2 A soft package battery of some embodiments of the prior art is shown. Figure 1 The soft package battery shown is fixed on the bottom plate by the adhesive layer.

[0019] Figure 3 A schematic view of the electronic device according to the embodiments of the present application is shown when the electronic device is a vehicle.

[0020] Figure 4 A front view of the soft package battery according to the first embodiment of the present application after the trimming process is shown.

[0021] Figure 5 A cross-sectional view taken along the line a-a of Figure 4 is shown.

[0022] Figure 6 A cross-sectional view of the packaging film is shown.

[0023] Figure 7 A front view of the soft package battery according to the first embodiment of the present application after the edge folding process is shown.

[0024] Figure 8 A cross-sectional view taken along the line b-b of Figure 7 is shown.

[0025] Figure 9 A front view of the soft package battery according to the first embodiment of the present application after the adhesive tape attaching process is shown.

[0026] Figure 10 A cross-sectional view taken along the line c-c of Figure 9 is shown.

[0027] Figure 11 A soft package battery according to the second embodiment of the present application is shown fixed on the bottom plate by the adhesive layer.

[0028] Figure 12 A front view of the soft package battery according to the second embodiment of the present application after the adhesive tape attaching process is shown.

[0029] Figure 13 A cross-sectional view taken along the line d-d of Figure 12 is shown.

[0030] Figure 14 A cross-sectional view taken along line e-e of FIG. 8 is shown.

[0031] Figure 15 A front view of the soft-pack battery according to the third embodiment of the present application after the adhesive tape attaching process is shown.

[0032] Figure 16 A cross-sectional view taken along line e-e of FIG. 8 is shown. Figure 15

[0033] Figure 17 A cross-sectional view taken along line e-e of FIG. 8 is shown. DETAILED DESCRIPTION

[0034] For better understanding of the spirit of the embodiments of the present application, the following further describes the same in conjunction with some preferred embodiments of the present application.

[0035] Embodiments of the present application will be described in detail below. Throughout the specification, the same or similar components and components having the same or similar functions are denoted by like reference numerals. The embodiments described herein with reference to the accompanying drawings are illustrative in nature, diagrammatic and for providing a basic understanding of the present application. The embodiments of the present application should not be construed as limiting the present application.

[0036] As used herein, the terms "approximately", "substantially", "essentially", and "about" are used to describe and account for small variations. When used in connection with an event or circumstance, the terms can refer to instances in which the event or circumstance occurs exactly, and instances in which the event or circumstance occurs approximately or nearly.

[0037] In this specification, unless specifically designated or limited, relative terms such as "central", "longitudinal", "lateral", "forward", "rearward", "rightward", "leftward", "internal", "external", "lower", "upper", "horizontal", "vertical", "higher", "lower", "above", "below", "top", "bottom", and derivatives thereof (e.g., "horizontally", "downwardly", "upwardly", etc.) should be construed to refer to the orientation of the described or depicted direction in the discussion. These relative terms are used only for convenience and do not require the application to be constructed or operated in a particular direction.

[0038] For ease of description, "first", "second", "third", etc. can be used herein to distinguish different components of a figure or a series of figures. "First", "second", "third", etc. are not intended to describe the corresponding components. ​

[0039] With the vigorous development of power batteries, more stringent requirements are put forward for the manufacturing process of power batteries. The manufacturing process of soft package battery is generally divided into: coating, rolling, slitting, die cutting, welding, packaging, baking, liquid injection, formation, high temperature aging, capacity, K (voltage drop of battery in a certain time interval), SOC (state of charge), OCV (open circuit voltage) test, final inspection and offline, wherein the final inspection and offline process includes edge folding (folding the packaging film after edge sealing by using equipment to ensure that it is close to the electrode assembly), thickness measurement and weight measurement.

[0040] Figure 1 A soft package battery 1 of some embodiments of the prior art is shown, Figure 2 A soft package battery 1 of some embodiments of the prior art is shown, Figure 1 The soft package battery 1 shown is fixed on the bottom plate 3 by the adhesive layer 2. After edge folding, the soft package battery 1 needs to be pasted with adhesive tape 4 to ensure that the folded sealing edge 5 is close to the electrode assembly, so as to ensure that the width of the soft package battery 1 fluctuates within a certain range. However, the prior art is to paste the adhesive tape 4 in the length direction L, and the part of the sealing edge 5 not constrained by the adhesive tape 4 will be raised, and the distance between the sealing edge 5 and the electrode assembly will be larger (for example, 1-5mm), which will cause the soft package battery 1 to be unable to pass the insulation and voltage resistance test. Figure 2 During the module assembly process shown, the adhesive layer 2 will enter the gap 6 between the raised sealing edge 5 and the main body part of the packaging film wrapping the electrode assembly, and the adhesive layer 2 will protrude at this position after solidification, thereby causing the thickness of the adhesive layer 2 in the corresponding area to be thin, the distance between the packaging film and the bottom plate 3 to be small, and the packaging film to be easily broken down when a high voltage is applied during the insulation and voltage resistance test, thereby causing the soft package battery 1 to fail the insulation test and affecting the safety performance. In addition, the edge of the sealing edge 5 is a cutting edge, and the metal layer in the packaging film is exposed at the part of the cutting edge not covered by the adhesive tape 4, which will further increase the risk of insulation failure.

[0041] Some embodiments of the prior art do not use adhesive tape 4, but apply adhesive between the folded sealing edge 5 and the main body part of the packaging film wrapping the electrode assembly. However, due to the narrowness of the folded sealing edge 5, the adhesive application process is difficult to control, for example, when the amount of adhesive is too much, it will overflow from the gap between the sealing edge 5 and the main body part of the packaging film wrapping the electrode assembly, and even overflow onto the large face (the side surface opposite to the thickness direction) of the battery; when the amount of adhesive is too small, it will cause the sealing edge 5 to be not firmly adhered. In order to prevent the problems such as adhesive overflow, the edge of the sealing edge 5 is generally not applied with adhesive, and the part without adhesive will be raised, and similar to the embodiment of pasting adhesive tape 4, there is also a risk of insulation failure due to the existence of exposed metal layer at the edge of the sealing edge 5.

[0042] The utility model provides an electronic device 1000, the following embodiment is in order to facilitate the explanation, with electronic device 1000 as vehicle is explained by example. Figure 3This illustration shows an electronic device 1000 in an embodiment of this application when it is a vehicle. A battery pack 1002 is installed inside the vehicle, and the battery pack 1002 can be located at the bottom, front, or rear of the vehicle body 1001. The battery pack 1002 can be used to power the vehicle; for example, it can serve as the vehicle's operating power source. The working part of the electronic device 1000 is electrically connected to the battery pack 1002 to obtain electrical power. The vehicle can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, but are not limited thereto. The battery pack 1002 provides electrical power for the vehicle's operation or the operation of its internal electrical components. However, in other embodiments, the electronic device 1000 can also be a mobile phone, portable device, laptop computer, ship, spacecraft, electric toy, and power tool, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc.; the working part is a unit component that can obtain electrical power from the battery pack 1002 and perform corresponding tasks, such as a fan blade rotation unit or a vacuum cleaner's suction unit. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric boat toys, and electric airplane toys, etc.; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose any special limitations on the aforementioned electronic device 1000.

[0043] Figure 4 This shows a front view of the soft-pack battery 100 according to the first embodiment of this application after the precision cutting process. Figure 5 It shows along Figure 4 A cross-sectional view taken from line aa. Figure 6 A cross-sectional view of the packaging film 20 is shown. Figure 7 The following is a front view of the soft-pack battery 100 according to the first embodiment of this application after the folding process. Figure 8 It shows along Figure 7 A cross-sectional view taken from the bb line. Figure 9 This shows a front view of the soft-pack battery 100 according to the first embodiment of this application after the tape application process. Figure 10 It shows along Figure 9 A cross-sectional view taken from the CC line. Figure 11 The image shows a pouch cell 100 according to a second embodiment of this application being fixed to a base plate 80 by an adhesive layer 82.

[0044] Figure 12 This shows a front view of the soft-pack battery 100 according to the second embodiment of this application after the tape application process. Figure 13 It shows along Figure 12 A cross-sectional view taken from the dd line.Figure 14 The soft package battery 100 according to the second embodiment of the present application is fixed on the bottom plate 80 through the adhesive layer 82.

[0045] Figure 15 The front view of the soft package battery 100 according to the third embodiment of the present application after the adhesive tape sticking process is shown, Figure 16 The cross-sectional view taken along the e-e line of Figure 15 The cross-sectional view taken along the e-e line of Figure 17 The soft package battery 100 according to the third embodiment of the present application is fixed on the bottom plate 80 through the adhesive layer 82.

[0046] In the first to third embodiments, the soft package battery 100 includes the cell body 10, the first adhesive tape 31, the cell body 10 includes the electrode assembly 12 encapsulated by the packaging film 20, the length direction L of the cell body 10 is the direction of the lead-out tab; the packaging film 20 includes the part thereof for wrapping the electrode assembly 12, and the first sealing edge 21 sealing the electrode assembly 12 at least on one side of the width direction W of the cell body 10, for example, see Figure 10 The first sealing edge 21 is bent towards the direction close to the cell body 10, the first sealing edge 21 is very narrow (for example, 2mm to 3mm), and the bent first sealing edge 21 does not exceed the cell body 10, so as to avoid the part exceeding the cell body 10 extending to the large face (the two side faces opposite in the thickness direction T) of the cell body 10 under the constraint of the first adhesive tape 31; for example, see Figure 9 Along the length direction L, the first sealing edge 21 is covered by the first adhesive tape 31 from one end to the other end, so as to bind the first sealing edge 21 to the cell body 10. The first adhesive tape 31 can be one adhesive tape continuously extending from one end to the other end of the first sealing edge 21 along the length direction L, or can be composed of two or more adhesive tapes together, as long as the first sealing edge 21 is completely covered, so as to bind the first sealing edge 21 to the cell body 10 in the manner of covering the first sealing edge 21.

[0047] The embodiments of the present application also provide a battery pack 1002, which includes a bottom plate 80, a soft package battery 100, and an adhesive layer 82. The soft package battery 100 can be selected from the first to third embodiments, the first sealing edge 21 completely covered by the first adhesive tape 31 is arranged opposite to the bottom plate 80, and is fixedly connected to the bottom plate 80 through the adhesive layer 82. The adhesive layer 82 not only realizes the fixation of the soft package battery 100, but also realizes the insulation between the soft package battery 100 and the bottom plate 80.

[0048] The first adhesive tape 31 of the embodiments of the present application completely covers the first sealing edge 21 along the length direction L, which can avoid the first sealing edge 21 from bulging / curving, and guarantees the flatness of the first sealing edge 21, which is conducive to the subsequent processes such as Figure 11The thickness of the adhesive layer 82 (and the distance between the soft pack battery 100 and the bottom plate 80) is uniform, and the adhesive layer 82 (material: structural adhesive or thermal conductive adhesive) does not enter the gap between the first sealing edge 21 and the battery body 10, thereby avoiding affecting the insulation performance of the battery pack 1002.

[0049] In the first to third embodiments, for example, referring to Figure 6 The packaging film 20 includes two plastic insulation layers 26 and a metal sealing layer 28 (for example, the packaging film 20 is an aluminum plastic film, and the metal sealing layer 28 is an aluminum layer) sandwiched between the two plastic insulation layers 26. Around the battery body 10, the adjacent plastic insulation layers 26 of the two packaging films 20 are fused together to obtain the first sealing edge 21 (and the second sealing edge 22). The edge of the first sealing edge 21 is a cutting edge, and the first adhesive tape 31 covers the edge of the first sealing edge 21 to insulate the exposed metal sealing layer 28 of the edge of the first sealing edge 21, which can avoid breaking the packaging film 20 when high voltage is applied, thereby improving the safety of the soft pack battery 100 and the battery pack 1002.

[0050] In the first and second embodiments, the packaging film 20 has the first sealing edge 21 and the second sealing edge 22 on opposite sides of the width direction W of the battery body 10. In the second embodiment, the plurality of second adhesive tapes 32 bind the second sealing edge 22 to the battery body 10, and the plurality of second adhesive tapes 32 are spaced apart from each other along the length direction L. Therefore, the binding schemes of the first sealing edge 21 and the second sealing edge 22 are different, for example, referring to Figure 12 In the appearance of the soft pack battery 100, it is easy to distinguish the upper side and the lower side, and in the assembly process of placing the soft pack battery 100 on the bottom plate 80 by using a mechanical hand, the upper side and the lower side of the soft pack battery 100 can be quickly and accurately identified by using a CCD camera, for example. In addition, the second sealing edge 22 on the side of the soft pack battery 100 opposite to the bottom plate 80 does not need to be applied with an adhesive layer, so the second sealing edge 22 has a low requirement for flatness, and the use of discontinuous second adhesive tapes 32 can save the amount of second adhesive tapes 32.

[0051] In the first embodiment, the second adhesive tape 32 is similar to the first adhesive tape 31, and along the length direction L, the second sealing edge 22 is covered by the second adhesive tape 32 from one end to the other end, so as to bind the second sealing edge 22 to the battery cell body 10. The second adhesive tape 32 can be one strip of adhesive tape continuously extending along the length direction L from one end to the other end of the second sealing edge 22, or can be composed of two or more strips of adhesive tape, as long as the second sealing edge 22 is completely covered, so as to bind the second sealing edge 22 to the battery cell body 10 in a manner of covering the second sealing edge 22. The battery pack further comprises a top cover of metal material, the second sealing edge 22 faces the top cover, and the second adhesive tape 32 completely covers the second sealing edge 22, thus also covering the metal sealing layer 28 of which the edge (cutting edge) of the second sealing edge 22 is exposed, which is conducive to the insulation between the top cover and the second sealing edge 22. In addition, when the integrated pouch battery 100 forms the battery pack 1002, some items require the pouch battery 100 to be able to flexibly turn around (for example, considering that the adjacent pouch battery 100 is connected in series or connected in parallel), and for the first embodiment in which the first sealing edge 21 and the second sealing edge 22 are both completely covered, the first sealing edge 21 and the second sealing edge 22 can both be close to one side of the bottom plate 80, so they can be turned around or upside down at will, which is convenient for the integration of the pouch battery 100.

[0052] In the first to third embodiments, the positive tab 40 and the negative tab 42 are respectively connected to the positive and negative electrode tabs of the electrode assembly 12 and extend out of the packaging film 20, and the positive tab 40 and the negative tab 42 are located at both ends of the battery cell body 10 along the length direction L. The first adhesive tape 31 extends beyond the first sealing edge 21 at least at one end along the length direction L, that is, the first adhesive tape 31 extends beyond and covers at least one end of the first sealing edge 21 along the length direction L, so as to insulate the metal sealing layer 28 exposed at the above-mentioned at least one end of the first sealing edge 21, for example, see Figure 9, the range beyond the distance f is, for example, 1 mm to 10 mm, for example, about 8 mm. The end of the first sealing edge 21 is also a cutting edge, so it is possible to expose the metal sealing layer 28, which is exposed very close to the positive / negative tab 40 / 42, and the positive / negative tab 40 / 42 switches between high and low temperatures due to charging and discharging. When there is a certain humidity inside the battery pack / battery group 1002, condensation will occur, and the condensation will flow towards the low place (i.e. towards the bottom plate 80). Once it flows to the exposed metal sealing layer 28 at the end of the first sealing edge 21, a short circuit will occur (especially on the side of the negative tab 42), and then corrosion will occur. The first adhesive tape 31 at least extends beyond the end of the first sealing edge 21 corresponding to the negative tab 42 in the length direction L to cover the end of the first sealing edge 21 corresponding to the negative tab 42, so as to insulate the exposed metal sealing layer 28, prevent the short circuit caused by condensation, and improve the insulation protection effect. At the same time, the distance by which the first adhesive tape 31 (and the second adhesive tape 32) extends beyond the first sealing edge 21 (and the second sealing edge 22) cannot be too large, so as to avoid interference with the installation of the end wire harness plate assembly and other structural members.

[0053] In the first to third embodiments, the first adhesive tape 31 (and the second adhesive tape 32) extends to the two opposite sides (usually referred to as the large faces of the soft package battery 100) of the cell body 10 in the thickness direction T. For example, see Figure 9 and Figure 10The portion of the first adhesive tape 31 (and the second adhesive tape 32) extending onto the large face is referred to as an extension portion, the two opposite sides of the cell body 10 in the width direction W are generally referred to as the narrow sides of the pouch battery 100, the extension portion of the first adhesive tape 31 (and the second adhesive tape 32) is the portion extending from the narrow side onto the large face, the dimension of the extension portion along the width direction W is d, the width of the cell body 10 (i.e. the distance between the two narrow sides of the cell body 10) is w, and 0.01≤d / w≤0.15, for example, d is in the range of 3mm to 8mm, for example, about 4mm or about 6mm. If d / w is too small, the portion of the first adhesive tape 31 (and the second adhesive tape 32) adhering to the cell body 10 is too small, in which case the adhesive strength of the first adhesive tape 31 (and the second adhesive tape 32) is required to be extremely high, otherwise, the first adhesive tape 31 (and the second adhesive tape 32) is likely to fail to adhere (e.g. to separate from the cell body 10 and curl up, etc.). In the battery pack 102, a plurality of pouch batteries 100 are tightly stacked, if d / w is too large, the thickness of the plurality of pouch batteries 100 at the first adhesive tape 31 (and the second adhesive tape 32) increases, which not only causes a large pressure on the large face of the cell body 10, but also affects the flatness of the large face of the cell body 10, and further affects the cycle life of the pouch battery 100, in addition, the use amount of the first adhesive tape 31 (and the second adhesive tape 32) is large, which also causes an increase in cost. In the second embodiment, the dimension of the portion of the second adhesive tape 32 on the large face is g, g is greater than d, for example, g is about 16mm, and the second adhesive tapes 32 on adjacent pouch batteries 100 can be staggered in the thickness direction to avoid an increase in the thickness accumulation at the second adhesive tape 32.

[0054] In the first to third embodiments, the thickness of the first adhesive tape 31 (and the second adhesive tape 32) is 20μm-50μm, the first adhesive tape 31 (and the second adhesive tape 32) comprises a substrate layer and an adhesive layer adhering the substrate layer and the packaging film 20, and the thickness ratio of the substrate layer and the adhesive layer is in the range of 1:1 to 1:4. If the first adhesive tape 31 (and the second adhesive tape 32) is too thick, the first adhesive tape 31 (and the second adhesive tape 32) is too hard to bend, which will cause the edges of the adhesive to not fit well; the first adhesive tape 31 (and the second adhesive tape 32) is a whole strip along the length direction L, and if it is too thin, wrinkles are likely to occur, which affects the flatness and the insulation and protection effect. In addition, if the substrate layer is too thin, the insulation and protection effect is insufficient; if the substrate layer is too thick, the first adhesive tape 31 (and the second adhesive tape 32) is too hard to fit well.

[0055] The third embodiment differs from the first and second embodiments in that the pouch battery 100 of the third embodiment does not comprise the second sealing edge 22 and the second adhesive tape 32, because when the packaging film 20 is punched to form two recesses for accommodating the electrode assembly 12, the distance between the two recesses is close, and when the packaging film 20 is folded to combine the two recesses to envelope the electrode assembly 12, theFigure 15 and Figure 16 As shown in the upper side, there is no redundant packaging film 20, so there is no need to further perform the edge sealing and fine cutting processes on this side, and there is also no second sealing edge 22.

[0056] The embodiments of the present application improve the consistency of the width of the soft package battery 100 by optimizing at least the first adhesive tape 31 on one side of the soft package battery 100, increase the distance between the packaging film 20 and the bottom plate 80, improve the pressure resistance and insulation of the battery pack 1002, and thus improve the safety during the entire life cycle.

[0057] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A pouch battery, characterized by, The battery cell includes: a cell body including an electrode assembly encapsulated by a packaging film, a length direction of the cell body being a direction in which a tab is drawn out; the packaging film has a first sealing edge sealing the electrode assembly, the first sealing edge being on at least one side of the cell body in a width direction, the first sealing edge being bent toward a direction close to the cell body; in the length direction, the first sealing edge is covered by a first adhesive tape from one end to the other end, so as to bind the first sealing edge to the cell body.

2. The pouch battery of claim 1, wherein, The packaging film includes two plastic insulation layers and a metal sealing layer sandwiched between the two plastic insulation layers, the first adhesive tape covers an edge of the first sealing edge to insulate the metal sealing layer exposed by the edge. 3.The pouch battery of claim 1, wherein, The packaging film also has a second sealing edge, the first sealing edge and the second sealing edge are located on opposite sides of the cell body in the width direction, a plurality of second adhesive tapes bind the second sealing edge to the cell body, and the plurality of second adhesive tapes are spaced apart from each other in the length direction. 4.The pouch battery of claim 1, wherein, The packaging film also has a second sealing edge, the first sealing edge and the second sealing edge are located on opposite sides of the cell body in the width direction, and in the length direction, the second sealing edge is covered by a second adhesive tape from one end to the other end, so as to bind the second sealing edge to the cell body. 5.The pouch battery of claim 2, wherein, Also included are: a positive tab and a negative tab, respectively connected to a positive tab and a negative tab of the electrode assembly, and the positive tab and the negative tab extend out of the packaging film, in the length direction, the positive tab and the negative tab are located at two ends of the cell body, in the length direction, the first adhesive tape exceeds and covers at least one of the one end and the other end of the first sealing edge to insulate the metal sealing layer exposed by the at least one of the one end and the other end.

6. The pouch battery of claim 5, wherein, in the length direction, the first adhesive tape exceeds and covers one of the one end and the other end corresponding to the negative tab to insulate the metal sealing layer exposed by the one of the one end and the other end.

7. The pouch battery according to any one of claims 1-6, wherein The cell body has two opposite sides in a thickness direction, the first adhesive tape has an extension extending onto the two sides, a dimension of the extension in the width direction is d, a width of the cell body is w, and 0.01≤d / w≤0.

15.

8. The pouch battery of claim 7, wherein, The thickness of the first adhesive tape is 20μm-50μm, the first adhesive tape includes a substrate layer and an adhesive layer, the adhesive layer bonds the substrate layer and the packaging film, and the thickness ratio of the substrate layer and the adhesive layer ranges from 1:1 to 1:

4.

9. A battery pack characterized by comprising: The battery cell includes: a bottom plate; the soft package battery of any one of claims 1 to 8, the first sealing edge being arranged opposite to the bottom plate; an adhesive layer, the first sealing edge being fixedly connected to the bottom plate through the adhesive layer.

10. An electronic device, comprising: The battery pack includes the battery of claim 9.

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