Pouch battery and electric device

Abstract

The utility model provides a kind of soft package battery and electric equipment, soft package battery includes electric core, encapsulation film and double-sided adhesive tape, electric core includes electric core main body, encapsulation film defines cavity, electric core main body is located in cavity, double-sided adhesive tape is located in cavity, double-sided adhesive tape includes substrate layer, first adhesive layer and second adhesive layer, first adhesive layer and second adhesive layer are respectively connected in the two surfaces of substrate layer mutually face away, first adhesive layer back and encapsulation film adhesive, second adhesive layer and electric core main body adhesive, substrate layer includes peripheral part and main part, peripheral part is located in the edge of main part, along the thickness direction of electric core, second adhesive layer and main part overlap, and second adhesive layer and peripheral part do not overlap.For the soft package battery, its double-sided adhesive tape is convenient to tear off in the repair process, and the risk of electric core damage is lower in the repair process.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially, relates to a kind of soft package battery and electrical equipment. BACKGROUND

[0002] Soft package battery adopts aluminum-plastic film to package cell, compared with traditional metal shell battery, soft package battery has the advantages of light weight, small size, high energy density, customizable shape etc. In order to improve the anti-drop performance of soft package battery, the aluminum-plastic film and cell of soft package battery will be bonded by double-sided tape. In this way, after soft package battery drops and collides with the ground, the cell is not easy to move relative to the aluminum-plastic film, and the risk of the aluminum-plastic film being broken by the cell is low.

[0003] In the production process of soft package battery, double-sided tape is usually first attached to the cell, and then the cell is packaged into the aluminum-plastic film. After the double-sided tape is attached to the cell, the tape may have defects such as wrinkles and bubbles. If the tape has the above defects, it needs to be repaired, that is, the tape needs to be torn off and the tape or new tape needs to be attached to the cell. However, in the process of tearing off the double-sided tape from the surface of the cell, the risk of damage to the cell is high, for example, the foil of the outermost layer of the cell is prone to damage and wrinkling. SUMMARY

[0004] The utility model aims at at least solving one of the technical problems existing in the prior art. To this end, the utility model provides a soft package battery, which is convenient to tear off during repair, and the risk of damage to the cell during repair is low.

[0005] The utility model also provides an electrical equipment comprising the above soft package battery.

[0006] According to the soft package battery of the first aspect of the utility model, the cell comprises a cell body; the packaging film defines a cavity, and the cell body is located in the cavity; the double-sided tape is located in the cavity, and the double-sided tape comprises a substrate layer, a first adhesive layer and a second adhesive layer, the first adhesive layer and the second adhesive layer are connected to the mutually opposite two surfaces of the substrate layer respectively, the first adhesive layer is bonded to the packaging film, the second adhesive layer is bonded to the cell body, the substrate layer comprises a peripheral portion and a main body portion, along the thickness direction of the cell, the second adhesive layer overlaps the main body portion along the thickness direction of the cell, and the second adhesive layer does not overlap the peripheral portion.

[0007] The soft package battery has at least the following beneficial effects: for the soft package battery, a part of the base material layer protrudes to outside the second adhesive layer, there is a non-adhesive area on one side of the double-sided adhesive tape facing the cell main body, the non-adhesive area is the peripheral area, and the non-adhesive area is located at the edge of the double-sided adhesive tape. Since the edge area of the double-sided adhesive tape is not bonded with the cell main body, the edge of the double-sided adhesive tape can be easily lifted by a worker with hands or tools, and then the double-sided adhesive tape is torn off. The worker does not need to pry the edge of the double-sided adhesive tape with tools for multiple times, which is beneficial to reducing the risk of damage of the cell and improving the convenience of tearing off the double-sided adhesive tape. Therefore, for the soft package battery, the double-sided adhesive tape is convenient to tear off in the repair process (assuming that repair is needed), and the risk of damage of the cell in the repair process is also relatively low.

[0008] According to some embodiments of the present application, the area of the base material layer is equal to the area of the first adhesive layer, and the edge of the base material layer completely coincides with the edge of the first adhesive layer; or the area of the base material layer is smaller than the area of the first adhesive layer, and the projection of the base material layer completely falls within the edge of the first adhesive layer; or the area of the base material layer is larger than the area of the first adhesive layer, and the projection of the first adhesive layer completely falls within the edge of the base material layer.

[0009] According to some embodiments of the present application, the second adhesive layer is completely located within the edge of the base material layer.

[0010] According to some embodiments of the present application, the cell further comprises a tab, in the first direction, the tab is located at one end of the cell main body, any two of the first direction, the second direction and the thickness direction of the double-sided adhesive tape are perpendicular to each other, and the first direction is the length direction of the double-sided adhesive tape; the edge of the second adhesive layer comprises two first side edges spaced apart in the first direction and two second side edges spaced apart in the second direction; the edge of the base material layer comprises two third side edges spaced apart in the first direction and two fourth side edges spaced apart in the second direction; each first side edge coincides with a part of the same side third side edge, and the second side edge and the fourth side edge satisfy: each second side edge is spaced apart from the same side fourth side edge, and both second side edges are located between the two fourth side edges; or one of the second side edges is spaced apart from the same side fourth side edge, and the other second side edge completely coincides with the same side fourth side edge.

[0011] According to some embodiments of the utility model, the electric core still includes the tab, in the first direction, the tab is located one end of the electric core main body, any two of the first direction, the second direction and the thickness direction of the double-sided tape are perpendicular to each other, and the first direction is the length direction of the double-sided tape;The edge of the second adhesive layer includes two first side edges arranged at intervals in the first direction, and two second side edges arranged at intervals in the second direction;The edge of the substrate layer includes two third side edges arranged at intervals in the first direction, and two fourth side edges arranged at intervals in the second direction;Each second side edge coincides with a part of the fourth side edge on the same side, and the first side edge and the third side edge satisfy: each first side edge is arranged at intervals with the third side edge on the same side, and the two first side edges are located between the two third side edges;Or, one of the first side edges is arranged at intervals with the third side edge on the same side, and the other first side edge is completely coincident with the third side edge on the same side.

[0012] According to some embodiments of the utility model, the area of the first adhesive layer is A, the area of the substrate layer is B, and the area of the second adhesive layer is C, A, B and C satisfy: 1≤A / C≤1.5;And / or, 1

[0013] According to some embodiments of the utility model, the area of the first adhesive layer is A, the area of the second adhesive layer is C, and the weight of the electric core is M, 15mm 2 / g≤(A+C) / M≤50mm 2 / g;And / or, the circumference of the first adhesive layer is Z1, the circumference of the second adhesive layer is Z2, and the weight of the electric core is M, 3mm / g≤(Z1+Z2) / M≤8mm / g.

[0014] According to some embodiments of the utility model, the electric core still includes the tab, in the first direction, the tab is located one end of the electric core main body, any two of the first direction, the second direction and the thickness direction of the double-sided tape are perpendicular to each other;The two end faces of the electric core main body in the thickness direction are two adhesive surfaces, and each adhesive surface is connected with a plurality of double-sided tapes.

[0015] According to some embodiments of the utility model, the first adhesive layer is a hot melt adhesive layer, and the second adhesive layer is a pressure sensitive adhesive layer;And / or, the material of the substrate layer is one of PP, PVC, PET, PE, PI and PTFE.

[0016] According to the electric equipment of the second aspect embodiment of the utility model, it includes the soft package battery of any one in the first aspect embodiment.

[0017] The additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter in the description of the application. BRIEF DESCRIPTION OF DRAWINGS

[0018] The present application will be further described with reference to the drawings and embodiments, wherein:

[0019] Figure 1 is a schematic view of a cross section of a double-sided tape in the prior art;

[0020] Figure 2 is a sectional view of a soft package battery according to the first embodiment of the present application;

[0021] Figure 3 is a plan view of the soft package battery and the double-sided tape in the first embodiment;

[0022] Figure 4 is a schematic view of a cross section of the double-sided tape in the first embodiment;

[0023] Figure 5 is a bottom view of the double-sided tape according to the first embodiment;

[0024] Figure 6 is a bottom view of the double-sided tape according to the second embodiment;

[0025] Figure 7 is a bottom view of the double-sided tape according to the third embodiment;

[0026] Figure 8 is a bottom view of the double-sided tape according to the fourth embodiment;

[0027] Figure 9 is a bottom view of the double-sided tape according to the fifth embodiment;

[0028] Figure 10 is a schematic view of a cross section of the double-sided tape according to the sixth embodiment;

[0029] Figure 11 is a schematic view of a cross section of the double-sided tape according to the seventh embodiment.

[0030] Reference signs: 100 - soft package battery, 101 - encapsulation film, 102 - cavity, 103 - cell, 104 - double-sided tape, 105 - first adhesive layer, 106 - base material layer, 107 - second adhesive layer, 108 - cell main body, 109 - adhesive surface, 110 - positive electrode tab, 111 - negative electrode tab, 112 - peripheral portion, 113 - second side edge, 114 - fourth side edge, 115 - first side edge, 116 - third side edge, 117 - main body portion. DETAILED DESCRIPTION

[0031] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0032] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0033] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0034] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0035] Figure 2 A pouch battery 100 according to a first embodiment of the present invention is shown. The pouch battery 100 includes a battery cell 103, an encapsulation film 101, and double-sided adhesive tape 104. The battery cell 103 can be a wound battery cell 103 or a stacked battery cell 103. The encapsulation film 101 can be an aluminum-plastic film, and the encapsulation film 101 forms a cavity 102 (as shown in the figure). Figure 3 As shown, the battery cell 103 includes a cell body 108 and two tabs, one of which is a positive tab 110 and the other is a negative tab 111. The tabs are connected to the same end of the cell body 108, and both tabs protrude outside the chamber 102. The cell body 108 includes a positive electrode plate, a negative electrode plate, and a separator (not shown), and the cell body 108 is located inside the chamber 102. Double-sided adhesive tape 104 is used to bond and fix the encapsulation film 101 and the battery cell 103 to prevent the battery cell 103 from shaking relative to the encapsulation film 101, reduce the risk of collision between the battery cell 103 and the encapsulation film 101, and thus reduce the risk of damage to the battery cell 103 or the encapsulation film 101.

[0036] like Figure 4As shown, the double-sided tape 104 includes a substrate layer 106, a first adhesive layer 105, and a second adhesive layer 107. The first adhesive layer 105 and the second adhesive layer 107 are respectively connected to two opposing surfaces of the substrate layer 106. The side of the first adhesive layer 105 facing away from the substrate layer 106 is bonded to the encapsulation film 101, and the side of the second adhesive layer 107 facing away from the substrate layer 106 is bonded to the battery cell body 108. The area of ​​the substrate layer 106 is smaller than the area of ​​the second adhesive layer 107, and at least a portion of the second adhesive layer 107 is located inside the edge of the substrate layer 106. The substrate layer 106 includes a main body portion 117 and a peripheral portion 112. Along the thickness direction of the battery cell 103, the second adhesive layer 107 overlaps with the main body portion 117, but does not overlap with the peripheral portion 112. The peripheral portion 112 is not bonded to the battery cell body 108.

[0037] It should be noted that the peripheral portion 112 and the cell body 108 may or may not be in contact. However, the substrate layer 106 is not adhesive, and the second adhesive layer 107 is offset from the cell body 108; that is, no adhesive is provided between the peripheral portion 112 and the cell body 108 (because the second adhesive layer 107 is offset from the peripheral portion 112). Therefore, even if the peripheral portion 112 and the cell body 108 are in contact, there is no adhesion between them, and they can be easily separated. For example, by slightly plucking or teasing the peripheral portion 112, it can be lifted up, thereby separating the peripheral portion 112 from the cell body 108.

[0038] Furthermore, in this invention, the area of ​​a structural layer refers to the area of ​​one end face of it in its thickness direction. For example, the area of ​​the first adhesive layer 105 can refer to the area of ​​its top surface; the area of ​​the second adhesive layer 107 can refer to the area of ​​its top surface; and the area of ​​the substrate layer 106 can also refer to the area of ​​its top surface.

[0039] To facilitate the introduction of the beneficial effects of the soft-pack battery 100 of this utility model, the prior art will be briefly described below.

[0040] like Figure 1 As shown, in the prior art, the area of ​​the second adhesive layer 107 is exactly equal to the area of ​​the substrate layer 106, and their edges completely overlap. This means that the edges of the double-sided tape 104 will adhere firmly to the cell body 108. If, during the manufacturing process of the pouch battery 100, after the double-sided tape 104 is applied to the cell 103, defects such as wrinkles or bubbles appear on the tape, then the tape needs to be removed and reapplied, or a new tape needs to be applied, to the cell 103.

[0041] The process of tearing off the adhesive tape in the prior art is roughly as follows: the worker needs to first pry the edge of the adhesive tape using a blade or other flat and thin tool, then pinch the pricked edge of the adhesive tape by hand or use a tool such as tweezers to clamp the pricked edge of the adhesive tape, and then gradually tear off the adhesive tape. Since the edge of the adhesive tape is bonded to the battery body 108 relatively firmly, the worker may need to try several times in the process of pricking the edge of the adhesive tape, which results in a long time and inconvenient operation required to tear off the adhesive tape. Moreover, in the process of pricking the edge of the adhesive tape several times, the tool such as a blade is easy to scratch or pierce the outermost foil of the battery 103 (for example, the outermost foil of the battery 103 is the positive electrode sheet), and the adhesive tape also frequently pulls the outermost foil of the battery 103, thereby causing the outermost foil of the battery 103 to wrinkle. Whether the battery 103 is damaged or the outermost layer of the battery 103 is wrinkled, it will affect the quality of the battery 103.

[0042] For the soft package battery 100 of the present application, since part of the base material layer 106 protrudes out of the second bonding layer 107, there is an area without adhesion on the side of the double-sided adhesive tape 104 facing the battery body 108, which is the peripheral area, and the area without adhesion is located at the edge of the double-sided adhesive tape 104. Since the edge area of the double-sided adhesive tape 104 is not bonded to the battery body 108, the worker can easily lift the edge of the double-sided adhesive tape 104 by hand or tool, and then tear off the double-sided adhesive tape 104. The worker does not need to pry the edge of the double-sided adhesive tape 104 several times with a tool, which is helpful to reduce the risk of damage to the battery 103 and also helpful to improve the convenience of tearing off the double-sided adhesive tape 104. Therefore, for the soft package battery 100 of the present application, the double-sided adhesive tape 104 is convenient to tear off in the process of repair (assuming that it needs to be repaired), and the risk of damage to the battery 103 is also relatively low in the process of repair.

[0043] The structure of the double-sided adhesive tape 104 will be described in detail below.

[0044] As shown in Figure 5 , in the first embodiment, the second bonding layer 107 is rectangular, and the edge of the second bonding layer 107 includes two first side edges 115 arranged at intervals in a first direction and two second side edges 113 arranged at intervals in a second direction. Among them, the first direction satisfies: in the first direction, the tab is located at one end of the battery body 108; and any two of the first direction, the second direction and the thickness direction of the double-sided adhesive tape 104 are perpendicular to each other. The first direction can be the front-rear direction, and the second direction can be the left-right direction. The thickness direction of the double-sided adhesive tape 104 is the direction in which the two bonding layers are stacked with each other, and the thickness direction can be the up-down direction. Figure 5 In the first embodiment, the thickness direction is the direction perpendicular to the paper surface; in Figure 4In the diagram, the first direction is perpendicular to the paper surface. Furthermore, the second direction is also the length direction of the double-sided tape 104.

[0045] like Figure 5 As shown, the substrate layer 106 is also rectangular. The edge of the substrate layer 106 includes two third side edges 116 spaced apart in a first direction and two fourth side edges 114 spaced apart in a second direction. Each first side edge 115 overlaps with a portion of a third side edge 116 on the same side. More specifically, the middle portion of the third side edge 116 overlaps with the first side edge 115. Each second side edge 113 is spaced apart from a fourth side edge 114 on the same side, and both second side edges 113 are located between the two fourth side edges 114. For a first side edge 115 and a third side edge 116 on the same side, they can both be located on the front or back side of the double-sided tape 104; for a second side edge 113 and a fourth side edge 114 on the same side, they can both be located on the left or right side of the double-sided tape 104.

[0046] This arrangement allows a portion of the substrate layer 106 to be located outside the edge of the second adhesive layer 107. Furthermore, in the first embodiment, the peripheral portion 112 includes two sub-regions, each located on one side of the second adhesive layer 107 in the second direction. These two sub-regions are relatively long and easy for workers to grasp, thus facilitating the removal of the double-sided tape 104.

[0047] Figure 6 A second embodiment of the double-sided tape 104 is shown. The second embodiment is similar to the first embodiment, with the main difference being that in the second embodiment, one second side 113 is spaced apart from a fourth side 114 on the same side, and the other second side 113 completely overlaps with the fourth side 114 on the same side. More specifically, the right second side 113 is spaced apart from the right fourth side 114, and the left second side 113 is spaced apart from the left fourth side 114. In the second embodiment, in the second direction, the peripheral portion 112 is entirely located on one side of the second adhesive layer 107. The second embodiment helps to reduce the manufacturing difficulty of the double-sided tape 104 and improve its manufacturing efficiency.

[0048] In the manufacturing process of double-sided tape 104, an initial adhesive layer can be first formed on the substrate layer 106 through a coating process. Then, a portion of the initial adhesive layer can be removed through a process such as laser cleaning, thereby transforming the initial adhesive layer into a second adhesive layer 107. Since the peripheral portion 112 is entirely located on one side of the second adhesive layer 107 in the second embodiment, only one edge of the initial adhesive layer needs to be cleaned when manufacturing the double-sided tape 104 of the second embodiment. This helps to reduce the manufacturing difficulty of the double-sided tape 104 and improve the manufacturing efficiency of the double-sided tape 104.

[0049] Figure 7 The double-sided tape 104 of the third embodiment is shown. In the third embodiment, each second side edge 113 coincides with a portion of the same-side fourth side edge 114, each first side edge 115 is spaced apart from the same-side third side edge 116, and both first side edges 115 are located between both third side edges 116.

[0050] In the third embodiment, the peripheral portion 112 includes two sub-areas, which are located on both sides of the second adhesive layer 107 in the first direction. In another aspect, the two sub-areas are located at both ends of the double-sided tape 104 in the length direction. In this way, the worker can pinch the end of the double-sided tape 104 in the length direction, and then gradually tear the double-sided tape 104 in the length direction, which is more convenient.

[0051] Figure 8 The double-sided tape 104 of the fourth embodiment is shown, which is similar to the third embodiment, and the main difference between the two is that in the fourth embodiment, one first side edge 115 is spaced apart from the same-side third side edge 116, and the other first side edge 115 is completely coincident with the same-side third side edge 116. More specifically, the rear first side edge 115 is spaced apart from the rear third side edge 116, and the front first side edge 115 is completely coincident with the front third side edge 116. In the fourth embodiment, the peripheral portion 112 is completely located on one side of the second adhesive layer 107 in the first direction, so the fourth embodiment is advantageous to reduce the manufacturing difficulty and improve the manufacturing efficiency of the double-sided tape 104.

[0052] Figure 9 The double-sided tape 104 of the fifth embodiment is shown. In the fifth embodiment, the second adhesive layer 107 is completely located within the edge of the substrate layer 106. That is, none of the portions of the edge of the second adhesive layer 107 coincides with or intersects the edge of the substrate layer 106. In this case, the second adhesive layer 107 can be rectangular (as shown), circular, elliptical, and the like. Figure 9

[0053] In the fifth embodiment, the peripheral portion 112 is frame-shaped, and the peripheral portion 112 surrounds the second adhesive layer 107. Therefore, the worker can choose to pinch any position of the peripheral portion 112, and then tear the double-sided tape 104. Since any position of the peripheral portion 112 can be pinched, the fifth embodiment is advantageous to improve the operational flexibility of the worker in tearing the double-sided tape 104.

[0054] ​In the above embodiments, the first adhesive layer 105 can be configured as a hot melt adhesive layer, and the second adhesive layer 107 can be configured as a pressure-sensitive adhesive layer. Thus, during the manufacturing process of the pouch battery 100, after the encapsulation film 101 wraps the cell body 108, heating and pressing the pouch battery 100 firmly bonds the double-sided tape 104 to the encapsulation film 101 and the cell 103.

[0055] An adhesive layer can be formed by applying an adhesive to the substrate layer 106. The substrate provides an adhesion surface for the adhesive, facilitating the formation of the adhesive layer. The substrate layer 106 can be PP (polypropylene), PVC (polyvinyl chloride), PET (polyethylene terephthalate), PE (polyethylene), PI (polyimide), PTFE (polytetrafluoroethylene), or other materials that facilitate adhesive adhesion.

[0056] like Figure 4 As shown, in the first embodiment, the area of ​​the substrate layer 106 is equal to the area of ​​the first adhesive layer 105, and the edge of the substrate layer 106 completely overlaps with the edge of the first adhesive layer 105. This arrangement helps to reduce the processing difficulty of the first adhesive layer 105.

[0057] like Figure 10 As shown, in the sixth embodiment, the area of ​​the substrate layer 106 is larger than the area of ​​the first adhesive layer 105, and the projection of the first adhesive layer 105 falls entirely within the edge of the substrate layer 106. This arrangement ensures that the side of the peripheral portion 112 facing away from the battery cell body 108 is also exposed outside the first adhesive layer 105, making it easier for workers to visually determine which part of the double-sided tape 104 should be pinched when tearing off the tape.

[0058] like Figure 11 As shown, in the seventh embodiment, the area of ​​the substrate layer 106 is smaller than the area of ​​the first adhesive layer 105, and the projection of the substrate layer 106 falls entirely within the edge of the first adhesive layer 105. This arrangement increases the area of ​​the first adhesive layer 105, thereby enhancing the adhesion between the double-sided tape 104 and the encapsulation film 101.

[0059] like Figure 3 As shown, in some embodiments, the two end faces of the battery cell body 108 in its thickness direction are two adhesive surfaces 109, and each adhesive surface 109 is bonded to multiple double-sided adhesive tapes 104. This arrangement can increase the number of double-sided adhesive tapes 104, thereby enhancing the adhesion between the encapsulation film 101 and the battery cell body 108.

[0060] The size design of each structural layer of the double-sided tape 104 is introduced as follows. If the area of the first adhesive layer 105 is denoted as A, the area of the substrate layer 106 is denoted as B, and the area of the second adhesive layer 107 is denoted as C, in some embodiments, 1 < B / C < 1.5. Specifically, the value of B / C can be 1.1, 1.2, 1.3, 1.4, 1.5, etc. B / C being greater than 1 makes the area of the substrate layer 106 greater than the area of the second adhesive layer 107, so that a part of the substrate layer 106 (i.e., the peripheral portion 112) is exposed outside the edge of the second adhesive layer 107. B / C being no greater than 1.5 can prevent the area of the second adhesive layer 107 from being too small relative to the area of the substrate layer 106, thereby preventing the adhesion of the double-sided tape 104 to the cell body 108 from being insufficient, and reducing the waste of the substrate layer 106.

[0061] In some embodiments, 1 < A / C < 1.5. This can prevent the area of the first adhesive layer 105 from being too different from the area of the second adhesive layer 107, thereby preventing the adhesion of the front and back sides of the double-sided tape 104 from being too different. Specifically, the value of A / C can be 1, 1.1, 1.2, 1.3, 1.4, 1.5, etc. Based on the above setting, after the pouch battery 100 is subjected to formation, the peeling force value between the first adhesive layer 105 and the aluminum-plastic film is a first peeling force value, the peeling force value between the second adhesive layer 107 and the cell body 108 is a second peeling force value, and the ratio of the first peeling force value to the second peeling force value is between 0.7-1.0 (including the end point values), so that the difference in adhesion of the front and back sides of the double-sided tape 104 is not too large.

[0062] In some embodiments, the weight of the cell 103 is M, 15 mm 2 / g < (A+C) / M < 50 mm 2 / g. This setting makes the amount of adhesive substance of the double-sided tape 104 moderate, prevents the double-sided tape 104 from being too adhesive and difficult to tear off, and avoids the outer foil of the cell 103 being torn by the double-sided tape 104 during testing of the cell 103 due to the double-sided tape 104 being too adhesive. In addition, this setting can also prevent the double-sided tape 104 from being too adhesive and unable to firmly fix the packaging film 101 and the cell body 108.

[0063] In some embodiments, the first adhesive layer 105 has a perimeter of Z1, the second adhesive layer 107 has a perimeter of Z2, and 3mm / g≤(Z1+Z2) / M≤8mm / g. This setting makes the amount of adhesive substance of the double-sided tape 104 moderate, preventing the double-sided tape 104 from being too sticky to be easily torn off, while avoiding the outer foil of the test battery 103 being pulled apart by the double-sided tape 104 due to the double-sided tape 104 being too sticky. In addition, this setting can also prevent the double-sided tape 104 from being too weak to firmly fix the encapsulation film 101 and the battery body 108.

[0064] The following shows data of tests on some soft package batteries 100. In the following table, test object 1 adopts the structure design of the prior art, and test objects 2-5 all adopt the structure design of the first embodiment (but the specific parameters are different).

[0065]

[0066] In the above table, the failure rate refers to the number of the test batteries 103 that have adverse conditions such as wrinkles or damage after the tape is torn off, divided by the total number of the test batteries 103. For example, 100 test objects 1 need to be tested by tearing off the tape, and if 30 of the test batteries 103 have adverse conditions after the tape is torn off, the failure rate is 30%. In the above table, the mechanical performance test pass rate refers to the ratio of the number of test objects in which all drop test items pass to the total number of test objects. The multiple drop tests can include light drop, drum drop, directional drop, free drop, etc., and the soft package battery 100 needs to be tested after dropping to see if it can still supply power normally. Assuming that 10 test objects 1 are tested by the above multiple drop tests, and all test objects 1 pass all drop test items, the mechanical performance test pass rate of the test objects 1 is 100%; if only 5 test objects 1 pass all drop test items, the mechanical performance test pass rate of the test objects 1 is 50%. The definition of the mechanical performance test pass rate of test objects 2-5 is similar, and is not described here.

[0067] As can be seen from the experimental results of test objects 2-5 in the above table, the soft package battery 100 of the embodiment of the present application can effectively reduce the risk of the test battery 103 having adverse conditions after the double-sided tape 104 is torn off, and the soft package battery 100 is not easily damaged after dropping.

[0068] The soft package battery 100 described above can be applied in an electrical equipment. The electrical equipment can be an electronic device, a new energy vehicle, an electric tool, etc. The electronic device can be a mobile phone, a tablet computer, a touch pen, a smart watch, etc. The electric tool can be an electric screwdriver, a power drill, etc.

[0069] In the description of the present utility model, the description of the reference terms "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are contained in at least one embodiment or example of the present utility model. In the specification, the illustrative description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

Claims

1. A pouch battery, characterized in that, include: Battery cell, including the battery cell body; An encapsulation film defines a cavity, and the battery cell body is located within the cavity; A double-sided adhesive tape is located within the cavity. The double-sided adhesive tape includes a substrate layer, a first adhesive layer, and a second adhesive layer. The first adhesive layer and the second adhesive layer are respectively connected to two opposing surfaces of the substrate layer. The first adhesive layer is bonded to the encapsulation film, and the second adhesive layer is bonded to the battery cell body. The substrate layer includes a peripheral portion and a main portion. The peripheral portion is located at the edge of the main portion along the thickness direction of the battery cell. The second adhesive layer overlaps with the main portion, but does not overlap with the peripheral portion.

2. The soft-pack battery according to claim 1, characterized in that, The area of ​​the substrate layer is equal to the area of ​​the first adhesive layer, and the edge of the substrate layer completely coincides with the edge of the first adhesive layer. Alternatively, the area of ​​the substrate layer is smaller than the area of ​​the first adhesive layer, and the projection of the substrate layer falls entirely within the edge of the first adhesive layer; Alternatively, the area of ​​the substrate layer is larger than the area of ​​the first adhesive layer, and the projection of the first adhesive layer falls entirely within the edge of the substrate layer.

3. The soft-pack battery according to claim 1, characterized in that, The second adhesive layer is completely within the edge of the substrate layer.

4. The soft-pack battery according to claim 1, characterized in that, The battery cell also includes a tab. In a first direction, the tab is located at one end of the battery cell body. Any two of the first direction, the second direction, and the thickness direction of the double-sided tape are perpendicular to each other, and the first direction is the length direction of the double-sided tape. The edge of the second adhesive layer includes two first side edges spaced apart in the first direction and two second side edges spaced apart in the second direction; the edge of the substrate layer includes two third side edges spaced apart in the first direction and two fourth side edges spaced apart in the second direction. Each of the first side edges coincides with a portion of a third side edge on the same side, and the second side edge and the fourth side edge satisfy the following conditions: each of the second side edges is spaced apart from a fourth side edge on the same side, and both of the second side edges are located between the two fourth side edges; or, one of the second side edges is spaced apart from a fourth side edge on the same side, and the other second side edge completely coincides with a fourth side edge on the same side.

5. The soft-pack battery according to claim 1, characterized in that, The battery cell also includes a tab. In a first direction, the tab is located at one end of the battery cell body. Any two of the first direction, the second direction, and the thickness direction of the double-sided tape are perpendicular to each other, and the first direction is the length direction of the double-sided tape. The edge of the second adhesive layer includes two first side edges spaced apart in the first direction and two second side edges spaced apart in the second direction; the edge of the substrate layer includes two third side edges spaced apart in the first direction and two fourth side edges spaced apart in the second direction. Each of the second side edges coincides with a portion of the fourth side edge on the same side, and the first side edge and the third side edge satisfy the following conditions: each of the first side edges is spaced apart from the third side edge on the same side, and both of the first side edges are located between the two third side edges; or, one of the first side edges is spaced apart from the third side edge on the same side, and the other of the first side edges completely coincides with the third side edge on the same side.

6. The soft-pack battery according to claim 1, characterized in that, The area of ​​the first adhesive layer is A, the area of ​​the substrate layer is B, and the area of ​​the second adhesive layer is C, where A, B, and C satisfy: 1≤A / C≤1.5; and / or, 1 and / or, the perimeter of the first adhesive layer is Z1, the perimeter of the second adhesive layer is Z2, the weight of the battery cell is M, 3mm / g≤(Z1+Z2) / M≤8mm / g.

7. The soft-pack battery according to claim 1, characterized in that, The area of ​​the first adhesive layer is A, the area of ​​the second adhesive layer is C, the weight of the battery cell is M, and the thickness is 15mm. 2 / g≤(A+C) / M≤50mm 2 / g; The battery cell also includes a tab, which is located at one end of the battery cell body in a first direction, and any two of the first direction, the second direction and the thickness direction of the double-sided tape are perpendicular to each other.

8. The soft-pack battery according to claim 1, characterized in that, The two end faces of the battery cell body in its thickness direction are two adhesive surfaces, and each adhesive surface is connected to multiple double-sided tapes. The first adhesive layer is a hot melt adhesive layer, and the second adhesive layer is a pressure-sensitive adhesive layer; 9. The pouch battery according to any one of claims 1 to 8, characterized in that, And / or, the material of the substrate layer is one of PP, PVC, PET, PE, PI, and PTFE. Includes the pouch cell battery as described in any one of claims 1 to 9.

10. Electrical equipment, characterized in that, ​

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