CN220797023U - Battery cell - Google Patents
Battery cell Download PDFInfo
- Publication number
- CN220797023U CN220797023U CN202322071731.2U CN202322071731U CN220797023U CN 220797023 U CN220797023 U CN 220797023U CN 202322071731 U CN202322071731 U CN 202322071731U CN 220797023 U CN220797023 U CN 220797023U
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- Prior art keywords
- tab
- layer
- battery
- area
- battery cell
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- 238000004806 packaging method and process Methods 0.000 claims abstract description 23
- 239000010410 layer Substances 0.000 claims description 169
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
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- DVATZODUVBMYHN-UHFFFAOYSA-K lithium;iron(2+);manganese(2+);phosphate Chemical compound [Li+].[Mn+2].[Fe+2].[O-]P([O-])([O-])=O DVATZODUVBMYHN-UHFFFAOYSA-K 0.000 description 1
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Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Landscapes
- Sealing Battery Cases Or Jackets (AREA)
Abstract
The utility model provides a battery, which comprises a battery core and a packaging body for packaging the battery core, wherein the battery core is provided with a first tab, the first tab comprises a first tab part extending out of the packaging body, and the ratio of the cross section area of the first tab part parallel to the thickness direction of the first tab part to the capacity of the battery core is greater than or equal to 0.6mm 2 /Ah. The utility model can realize the performances of high power, long service life and the like of the battery.
Description
Technical Field
The utility model relates to the field of electrochemical energy storage devices, in particular to a battery.
Background
Currently, higher and higher requirements are put on the power performance, service life and other performances of a battery, for example, an automobile low-voltage (such as 12V and 48V) system has the advantages of low cost and the like, fuel consumption can be reduced for a fuel oil vehicle, better safety guarantee can be provided for a new energy vehicle, and the battery (such as a lithium ion secondary battery) used by the low-voltage system generally needs excellent service life (such as service life of more than 8 years) and other performances. However, with the increase of storage and use time, the power performance and other performances of the battery are seriously attenuated, and the service life is low.
Disclosure of Invention
The utility model provides a battery, which at least solves the technical problems of serious power performance attenuation, low service life and the like of the battery in the prior art.
The utility model provides a battery, which comprises a battery core and a packaging body for packaging the battery core, wherein the battery core is provided with a first tab, the first tab comprises a first tab part extending out of the packaging body, and the ratio of the cross section area of the first tab part parallel to the thickness direction of the first tab part to the capacity of the battery core is greater than or equal to 0.6mm 2 /Ah。
According to an embodiment of the present utility model, the battery cell is further provided with a second tab including a second tab protruding from the package, a ratio of a cross-sectional area of the second tab parallel to a thickness direction of the second tab to a capacity of the battery cell being greater than or equal to 0.6mm 2 /Ah。
According to an embodiment of the present utility model, the first tab is a positive tab, and a ratio of a cross-sectional area of the first tab parallel to a thickness direction of the first tab to a capacity of the battery cell is greater than or equal to 0.7mm 2 /Ah。
According to an embodiment of the present utility model, the package includes a first support layer, a third adhesive layer, a second support layer, a second adhesive layer, a metal layer, a first adhesive layer, and a heat seal layer that are stacked; the packaging body comprises a containing area and a sealing area for sealing the containing area, and the battery cell is positioned in the containing area; the package has a first side and a second side, the heat seal layer of the first side of the seal area being connected to the heat seal layer of the second side of the seal area.
According to an embodiment of the utility model, the heat seal layer of the first side of the seal area is integrated with the heat seal layer of the second side of the seal area; and/or, the first adhesive layer comprises an acid-modified polypropylene layer; and/or, the heat seal layer comprises a polypropylene layer; and/or, the first support layer comprises a polyester layer; and/or, the second support layer comprises a nylon layer; and/or, the metal layer comprises an aluminum layer; and/or the roughness of the side of the metal layer facing the second bonding layer is greater than the roughness of the side of the metal layer facing the first bonding layer.
According to one embodiment of the present utility model, the thickness of the seal area is 210 μm to 260 μm; and/or the width of the seal area is greater than or equal to 2mm.
According to an embodiment of the utility model, the thickness of the package is greater than 90 μm.
According to an embodiment of the present utility model, the battery cell is a battery cell with a capacity of less than 30 Ah.
According to an embodiment of the utility model, the ratio of the thickness of the cell to the capacity of the cell is less than 4mm/Ah.
According to an embodiment of the utility model, the volume of the battery cell is 240cm 3 ～302cm 3 The method comprises the steps of carrying out a first treatment on the surface of the And/or the length of the battery cell is 100-250 mm, and/or the width of the battery cell is 80-150 mm, and/or the thickness of the battery cell is 3-15 mm.
In the battery provided by the utility model, the ratio of the cross-sectional area of the first tab part extending out of the packaging body to the capacity of the battery core is greater than or equal to 0.6mm 2 In the high-power working process of the battery under high current, the Ah can reduce side reaction,the heat generation is reduced, the higher power performance and other performances of the battery can be maintained after the battery is used for a long time, the service life of the battery is prolonged, the service life of the battery can be particularly prolonged to more than 8 years, and the power performance attenuation rate of the battery is not higher than 15% after the battery is used for more than 8 years, so that the high power and long service life are realized.
Drawings
Fig. 1 is a schematic view of a battery structure according to an embodiment of the utility model;
fig. 2 is the region Q in fig. 1 1 Is a schematic cross-sectional view of (a);
FIG. 3 is a schematic diagram of a battery cell structure of a battery according to an embodiment of the utility model;
FIG. 4 is a schematic cross-sectional view of a connection structure between a first inner tab and a first tab portion of a battery according to an embodiment of the utility model;
fig. 5 is a region Q in fig. 1 2 Is a schematic cross-sectional view of (a);
fig. 6 is a schematic diagram showing a stacked structure of a positive electrode sheet, a separator and a negative electrode sheet of a battery according to an embodiment of the present utility model;
Fig. 7 is a schematic view of a battery structure of an embodiment of the present utility model when the package is not heat sealed;
fig. 8 is a schematic view of a battery structure of a package body after heat sealing according to an embodiment of the present utility model;
FIG. 9 is a structural electron microscope view of a package according to an embodiment of the present utility model.
Reference numerals illustrate: 11: top edge banding; 12: side edge sealing; 101: a heat-sealing layer; 102: a first adhesive layer; 103: a metal layer; 104: a second adhesive layer; 105: a second support layer; 106: a third adhesive layer; 107: a first support layer; 108: a connection layer; 110: a receiving area; 10: a seal area; 20: a non-seal area; 111: a first side portion; 1111: a first body region; 1112: a first fusion zone; 112: a second side portion; 1121: a second body region; 1122: a second fusion region; 2: a battery cell; 21: a first tab portion; 211: a first built-in portion; 212: a first epitaxial portion; 100: a first inner tab; 2011: a first sub-tab; 210: the connection part of the first tab part 21 and the first inner tab part 100; 22: a second pole ear; 200: a second inner tab; 2021: a second sub-tab; 220:the connection part of the second electrode lug 22 and the second inner electrode lug 200; 23: a protective layer; 201: a first pole piece; 202: a second pole piece; 3: a diaphragm; 31: a third side portion; 32: a bending part; 310: a first region; 320: a second region; 30: a notch; t (T) 1 、T 2 、T 3 : thickness; t (T) 10 : the thickness of the seal area; t (T) 0 : the thickness of the package; w (w) 10 : the width of the seal area; q (Q) 1 、Q 2 : an area.
Detailed Description
The present utility model will be described in further detail below for the purpose of better understanding of the aspects of the present utility model by those skilled in the art. The following detailed description is merely illustrative of the principles and features of the present utility model, and examples are set forth for the purpose of illustration only and are not intended to limit the scope of the utility model. All other embodiments, which can be made by those skilled in the art based on the examples of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "disposed," "connected," "coupled," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; the connection may be mechanical connection, electrical connection, or communication connection (network connection); the components can be directly connected, or indirectly connected through an intermediate medium, or the two components are internally communicated. The above-described specific meanings belonging to the present utility model will be understood in detail by those skilled in the art. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only, such as distinguishing between components, and not necessarily for describing/interpreting the claims, but rather for indicating or implying a number of features or order of substantial significance in what is indicated.
The embodiment of the utility model provides a battery, as shown in fig. 1 to 8, the battery comprises a battery cell 2 and a packaging body for packaging the battery cell 2, the battery cell 2 is provided with a first tab, and the first tab comprises a protrusionA first tab portion 21 of the package, a cross-section of the first tab portion 21 parallel to a thickness direction of the first tab portion (i.e., the cross-section is parallel to the thickness direction of the first tab portion) having an area to capacity ratio of the battery cell 2 of 0.6mm or more 2 /Ah。
In this way, in the high-power working process of the battery under high current, side reaction can be reduced, heat generation is reduced, the higher power performance and other performances of the battery can be maintained after the battery is used for a long time, the service life of the battery is prolonged, the service life of the battery can be prolonged to more than 8 years, and the power performance decay rate of the battery is not higher than 15% after the battery is used for more than 8 years.
Further, the battery may have a charge rate of more than 10C and a discharge rate of more than 20C.
Specifically, the first tab may be a positive tab or a negative tab, and in some preferred embodiments, the first tab is a positive tab, and the ratio of the cross-sectional area of the first tab 21 parallel to the thickness direction of the first tab 21 to the capacity of the battery cell is greater than or equal to 0.7mm 2 /Ah, which facilitates further reducing the rate of decay of the power performance of the battery.
In addition, as shown in fig. 1 and 3, the above-mentioned battery cell 2 is further provided with a second tab, and the polarity of the second tab is opposite to that of the first tab, that is, the first tab is a positive tab, the second tab is a negative tab, or the first tab is a negative tab, and the second tab is a positive tab.
In some preferred embodiments, the second tab includes a second tab portion 22 protruding from the package, the ratio of the cross-sectional area of the second tab portion 22 parallel to the thickness direction of the second tab portion 22 to the capacity of the battery cell being greater than or equal to 0.6mm 2 Ah, i.e. the positive and negative tabs of the battery meet a ratio of their cross-sectional area to the capacity of the cell 2 of greater than or equal to 0.6mm 2 and/Ah, thus being beneficial to further reducing the attenuation rate of the power performance of the battery and prolonging the service life of the battery.
The thickness direction of the first tab portion 21, the thickness direction of the second tab portion 22, and the thickness direction of the battery or cell 2 (parallel to the third direction in fig. 2, 4, 5, 7, and 8) are parallel to each other.
In addition, as shown in fig. 1, 2 and 8, the package body includes a receiving area 110 and a sealing area 10 for sealing the receiving area 110, and the battery cell 2 is located in the receiving area 110; the package comprises a first adhesive layer 102 and a heat-sealing layer 101 which are connected, the package has a first side 111 and a second side 112, the heat-sealing layer 101 of the first side 111 of the seal zone 10 is connected with the heat-sealing layer 101 of the second side 112 of the seal zone 10, and the thickness of the first adhesive layer 102 of the first side 111 of the seal zone 10 is T 1 The first adhesive layer 102 of the second side 112 of the seal area 10 has a thickness T 2 The sum of the thicknesses of the heat-seal layer 101 of the first side 111 of the seal area 10 and the heat-seal layer 101 of the second side 112 of the seal area 10 is T 3 That is, the distance from the side of the heat seal layer 101 of the first side portion 111 of the seal area 10 facing the first adhesive layer 102 of the first side portion 111 to the side of the heat seal layer 101 of the second side portion 112 of the seal area 10 facing the first adhesive layer 102 of the second side portion 112 is T 3 ，T 3 ＜T 1 +T 2 。
In this way, the connecting portion (connecting layer 108) of the heat seal layer 101 of the first side 111 and the second side 112 of the seal area 10 can be made to have a relatively small cross-sectional area, and moisture and the like can be reduced from entering the accommodating area 110 while closing the accommodating area 110 by the heat seal layer 101; meanwhile, the first adhesive layers 102 on two opposite sides of the connection layer 108 have relatively large cross-sectional areas, the connection layer 108 is combined with the first adhesive layers 102 on two opposite sides of the connection layer 108, so that the packaging strength and structural stability of the seal area 10 are improved, the long-term excellent power performance, the cycle performance, the safety and other performances of the battery are kept, the service life of the battery is prolonged, the service life of the battery can be prolonged to more than 8 years, the packaging strength, the power performance and other performance attenuation degree of the battery are reduced after the battery is stored and used for more than 8 years, and the power performance attenuation rate is not higher than 15% after the battery is stored for 8 years through simulation.
Specifically, fig. 7 is a schematic structural diagram of a package body when not heat sealed, fig. 8 is a schematic structural diagram of a battery after heat sealing of the package body, as shown in fig. 7 and 8, the first side 111 includes a first body region 1111 and a first fusion region 1112 connected to each other, the first body region 1111 is a region corresponding to the first side 111 of the receiving region 110 (i.e., the first body region 1111 is a portion of the first side 111 corresponding to the receiving region 110), the first fusion region 1112 is the first side 111 of the sealing region 10 (i.e., the first fusion region 1112 is a portion of the first side 111 located at the sealing region 10), the second side 112 includes a second body region 1121 and a second fusion region 1122 connected to each other, the second body region 1121 is a second side 112 corresponding to the receiving region 110 (i.e., the second body region 1121 is a portion of the second side 112 corresponding to the receiving region 110), the second fusion region 1122 is a second side 112 of the sealing region 10 (i.e., the second fusion region 1122 is a portion of the second side 112 located at the sealing region 10), the second body region 1111 is a portion of the second side layer of the sealing region 101 opposite to the second side 101 and the second side of the second body region 101 is a portion of the second side layer of the sealing region 101 and the second side region 101 is connected to the second fusion region 101.
Fig. 2 is the region Q in fig. 1 1 The heat-seal layer 101 of the first side 111 of the seal area 10 and the heat-seal layer 101 of the second side 112 of the seal area 10 may be bonded together, typically as a composite, i.e., as a single layer (hereinafter referred to as the tie layer 108), as shown in the schematic cross-sectional view of the area where no tab protrudes.
In particular, the heat seal layer 101 may be used to heat seal the package to form an edge seal. In specific implementation, the first fusion area 1112 and the second fusion area 1122 can be heat-sealed at a high temperature, and in the heat-sealing process, the heat-sealing layer 101 of the first fusion area 1112 and the heat-sealing layer 101 of the second fusion area 1122 are fused with each other after being melted, so that the first fusion area 1112 and the second fusion area 1122 are combined into one layer (i.e. combined into a whole to form the connecting layer 108), so as to seal the accommodating area 110, and realize the packaging of the battery.
Wherein the thickness of the connection layer 108 is T 3 By controlling T 3 ＜T 1 +T 2 The heat sealing can be performed to close the receiving area 110 while the formed connection layer 108 has a relatively small thickness, i.e., a relatively small cross-sectional area (a cross-sectional area parallel to the thickness direction of the connection layer 108), so as to reduce infiltration of moisture and other components into the receiving area 110, while bonding the sitesThe first adhesive layer 102 (i.e., the first adhesive layer 102 of the first side portion 111 and the first adhesive layer 102 of the second side portion 112) on opposite sides of the connection layer 108 can improve the packaging strength and structural stability of the seal area 10, thereby improving the performance such as the service life of the battery.
The thickness direction of the connection layer 108, the thickness direction of the sealing region 10, the direction from the first side 111 of the sealing region 10 to the second side 112 of the sealing region 10, and the thickness direction of the battery or cell 2 are parallel to each other.
Specifically, as shown in fig. 1, the package includes a sealing edge, which may generally include a top sealing edge 11 located on one side of the cell 2 in a first direction, and side sealing edges 12 located on opposite sides of the cell 2 in a second direction. The seal area 10 is an effective seal area of the seal edge, that is, the seal area 10 is an area where the heat seal layer 101 of the first side portion 111 and the heat seal layer 101 of the second side portion 112 are connected, the seal area 10 is substantially overlapped with the orthographic projection of the connecting layer 108 formed by fusing the heat seal layer 101 of the first side portion 111 and the heat seal layer 101 of the second side portion 112, the orthographic projection refers to the projection of the seal area 10 and the connecting layer 108 along the third direction, that is, the orthographic projection of the seal area 10 and the connecting layer 108 is perpendicular to the third direction, that is, the projection of the seal area and the heat seal layer 101 of the second side portion 112 are substantially overlapped, and the plane a is perpendicular to the third direction.
The first direction, the second direction and the third direction are intersected in pairs, and may be perpendicular to each other, that is, the first direction is perpendicular to the second direction, the second direction is perpendicular to the third direction, and the first direction is perpendicular to the third direction. As illustrated in fig. 2, 4, 5, 7 and 8, the third direction is the thickness direction of the battery or the battery cell 2, one of the first direction and the second direction is the length direction of the battery or the battery cell 2, the other is the width direction of the battery or the battery cell 2, that is, the first direction is the length direction of the battery or the battery cell 2, the second direction is the width direction of the battery or the battery cell 2, or the first direction is the width direction of the battery or the battery cell 2, and the second direction is the length direction of the battery or the battery cell 2.
Specifically, the thickness T of the seal area 10 10 May be 210 μm to 260 μm, for example 210 μm, 220 μm, 230 μm, 240 μm, 250 μm, 260 μm or any two of themRanges are made. The thickness of the sealing region 10 is equal to the distance (distance in the third direction) from the side of the first side 111 of the sealing region 10 facing away from the second side 112 to the side of the second side 112 of the sealing region facing away from the first side 111.
That is, the seal area T of the top seal 11 10 The thickness T of the seal area 10 of the side seal 12 may be in the range of 210 μm to 260 μm, for example 210 μm, 220 μm, 230 μm, 240 μm, 250 μm, 260 μm or any two of these 10 The thickness T of the seal area 10 of the top sealing edge 11 may be in the range of 210 μm to 260 μm, for example 210 μm, 220 μm, 230 μm, 240 μm, 250 μm, 260 μm or any two thereof 10 Thickness T of seal area 10 with side seal 12 10 May be the same or different.
In addition, the width w of the seal area 10 10 May be greater than or equal to 2mm, i.e. the width w of the sealing zone 10 of the top sealing edge 11 10 Width w of seal area 10 with side seal 12 10 Greater than or equal to 2mm, respectively. Width w of seal area 10 of top seal 11 10 Width w of seal area 10 with side seal 12 10 May be the same or different (generally substantially the same).
Specifically, as shown in fig. 1, the width direction of the seal area 10 of the top seal 11 is substantially parallel to the first direction, and the length direction is substantially parallel to the second direction; the seal area 10 of the side seal 12 has a width direction substantially parallel to the second direction and a length direction substantially parallel to the first direction.
As shown in fig. 1, 2 and 8, the sealing edge may include, in addition to the sealing region 10, an unsealed region 20 where the first side 111 and the second side 112 are not connected, i.e., the first side 111 and the second side 112 of the unsealed region 20 are independent of each other, are not connected, and the heat-seal layers 101 thereof are not fused with each other. Wherein the non-sealing region 20 is located at a side of the sealing region 10 facing away from the receiving region 110.
In some embodiments, (T) 1 +T 2 )-T 3 Is in the range of 10 μm to 60 μm (i.e., 10 μm.ltoreq.T 1 +T 2 )-T 3 ≤60μm)，(T 1 +T 2 )-T 3 For example, 10 μm, 13 μm, 15 μm, 18 μm, 20 μm, 23 μm, 25 μm, 28 μmm, 30 μm, 32 μm, 35 μm, 38 μm, 40 μm, 43 μm, 45 μm, 48 μm, 50 μm, 53 μm, 55 μm, 58 μm, 60 μm or a range between any two of them, thus facilitating further improvement of the package strength and structural stability of the seal area 10 and improving the service life of the battery.
In some embodiments, T 1 The composition may be in a range of 18 μm to 66 μm, for example 18 μm, 20 μm, 25 μm, 30 μm, 33 μm, 36 μm, 38 μm, 40 μm, 42 μm, 44 μm, 47 μm, 50 μm, 55 μm, 60 μm, 66 μm or any two thereof.
In some embodiments, T 2 The composition may be in a range of 18 μm to 66 μm, for example, 18 μm, 20 μm, 25 μm, 30 μm, 33 μm, 36 μm, 38 μm, 40 μm, 42 μm, 44 μm, 47 μm, 50 μm, 55 μm, 60 μm, 66 μm, or any two thereof, respectively.
Wherein T is 1 And T 2 May be equal or unequal.
In some embodiments, T 3 The composition may be in a range of 20 μm to 90 μm, for example, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 43 μm, 45 μm, 48 μm, 50 μm, 53 μm, 55 μm, 58 μm, 60 μm, 65 μm, 70 μm, 75 μm, 80 μm, 85 μm, 90 μm or any two thereof.
Specifically, the package body may be a multi-layer structure, and may further include a first supporting layer 107, a third bonding layer 106, a second supporting layer 105, a second bonding layer 104, and a metal layer 103, where the first supporting layer 107, the third bonding layer 106, the second supporting layer 105, the second bonding layer 104, the metal layer 103, the first bonding layer 102, and the heat sealing layer 101 are sequentially stacked, and by adopting the package body with the multi-layer structure, the package effect can be further improved, components such as water vapor are prevented from entering the accommodating area 110, and the service life and other performances of the battery are improved.
The heat-sealing layer 101 is used for packaging the battery cell 2 by the package body, for example, by a heat-sealing process, so as to seal the accommodating area 110. In some embodiments, the heat seal layer 101 may include a Polypropylene layer (PP layer), that is, a Polypropylene (PP) layer.
Illustratively, the thickness of the heat seal layer 101 may be in the range of 36 μm to 44 μm, for example 36 μm, 38 μm, 40 μm, 42 μm, 44 μm, or any two of these. It is understood that the thickness (36 μm to 44 μm) of the heat-seal layer 101 herein refers to the thickness of the heat-seal layer 101 in the region of the package not involved in heat-sealing (i.e., the portion where the first side portion 111 and the second side portion 112 are not bonded), such as the portion of the package corresponding to the receiving region 110 (the first body region 1111 and the second body region 1121), and the non-seal region 20 not involved in heat-sealing.
In addition, the first adhesive layer 102 may include an acid-modified polypropylene layer (APP layer), that is, the material is mainly acid-modified polypropylene (Acid modified Polypropylene, APP), and the acid-modified polypropylene is a material formed by modifying polypropylene with an acid, and by modifying the acid, a carboxyl group, an aldehyde group, a hydroxyl group, or the like can be introduced into the acid-modified polypropylene, thereby improving the adhesive force of the acid-modified polypropylene layer. The acid-modified polypropylene layer may be formed using acid-modified polypropylene materials conventional in the art in the embodiments of the present utility model, which are not particularly limited.
Specifically, the roughness of the surface of the metal layer 103 facing the second adhesive layer 104 is greater than the roughness of the surface of the metal layer 103 facing the first adhesive layer 102, the surface of the metal layer 103 facing the second adhesive layer 104 is a rough surface (Mat surface), the surface of the metal layer 103 facing the first adhesive layer 102 is a smooth surface (mirrorsurface), and when the first adhesive layer 102 is an acid modified polypropylene layer, the adhesion between the smooth surface of the metal layer 103 and the heat seal layer 101 can be improved, and the service life and other performances of the battery can be further improved.
Specifically, the metal layer 103 may include an aluminum layer, typically a soft aluminum layer (Soft Aluminum foil, ALM), such as a commercial 8021 aluminum foil, 8071 aluminum foil, or the like. The package is an aluminum plastic film.
Specifically, the thickness of the metal layer 103 may be in a range of 35 μm to 45 μm, for example, 35 μm, 36 μm, 38 μm, 40 μm, 42 μm, 44 μm, 45 μm, or any two of them.
In addition, the second supporting layer 105 may include a Nylon layer, i.e., nylon (Oriented Nylon), but is not limited thereto. The thickness of the second support layer 105 may be in the range of 13 μm to 17 μm, for example 13 μm, 13.5 μm, 14 μm, 14.5 μm, 15 μm, 15.5 μm, 16 μm, 16.5 μm, 17 μm, or any two of these.
In addition, the first supporting layer 107 may include a polyester layer, and specifically may include a PET layer, that is, a material of polyethylene terephthalate (Polyethylene Telephtarte, PET), but is not limited thereto. The thickness of the first support layer 107 may be in the range of 10 μm to 14 μm, for example 10 μm, 10.5 μm, 10.8 μm, 11 μm, 11.5 μm, 12 μm, 12.5 μm, 13 μm, 13.2 μm, 13.5 μm, 14 μm, or any two thereof.
In addition, the second Adhesive layer 104 is used to adhere the metal layer 103 and the second supporting layer 105, the third Adhesive layer 106 is used to adhere the first supporting layer 107 and the second supporting layer 105, and the first Adhesive layer 102 and the second Adhesive layer 104 may be Adhesive layers (Adhesive layers) which are conventional in the art, and the thickness thereof may also be conventional in the art.
Illustratively, the ratio of the mass of the third adhesive layer 106 to the area of the first support layer 107 or the second support layer 105 facing the third adhesive layer 106 may be (3.3-4.8) g/m 2 For example 3.3g/m 2 、3.5g/m 2 、3.8g/m 2 、4g/m 2 、4.3g/m 2 、4.5g/m 2 、4.8g/m 2 Or a range of any two of these.
Illustratively, the ratio of the mass of the second adhesive layer 104 to the area of the side of the second support layer 105 (or the metal layer 103) facing the second adhesive layer 104 may be (3.3-4.8) g/m 2 ) For example 3.3g/m 2 、3.5g/m 2 、3.8g/m 2 、4g/m 2 、4.3g/m 2 、4.5g/m 2 、4.8g/m 2 Or a range of any two of these.
In addition, thickness T of the package 0 The composition may be greater than 90 μm, for example, in the range of 90 μm, 100 μm, 110 μm, 120 μm, 130 μm, 140 μm, 150 μm, 160 μm, 170 μm, 180 μm, 190 μm, 200 μm, or any two thereof, but is not limited thereto. Therefore, the water vapor permeation can be better prevented, and the safety, the service life and other performances of the battery are further improved.
As shown in fig. 7 and 8, the thickness T of the package body 0 Refers to the thickness of one side of the area of the packaging body which does not participate in heat sealing, namely the thickness T of the packaging body 0 Equal to the thickness of the first body region 1111 or the thickness of the second body region 1121.
Specifically, the volume of the cell 2 may be 240cm 3 ～302cm 3 For example 240cm 3 、250cm 3 、260cm 3 、270cm 3 、280cm 3 、290cm 3 、300cm 3 、302cm 3 Or a range of any two of these.
In some embodiments, the length of the cell 2 may be in the range of 100mm to 250mm, such as 100mm, 120mm, 150mm, 180mm, 200mm, 220mm, 250mm, or any two of these.
In some embodiments, the width of the cells 2 may be 80mm to 150mm, such as 80mm, 90mm, 100mm, 110mm, 120mm, 130mm, 140mm, 150mm, or a range of any two of these.
In some embodiments, the thickness of the cell 2 may be in the range of 3mm to 15mm, such as 3mm, 5mm, 8mm, 10mm, 13mm, 15mm, or any two of these.
In addition, the ratio of the thickness of the battery cell 2 to the capacity of the battery cell 2 can be smaller than 4mm/Ah, so that the battery cell 2 has better heat dissipation effect, and the safety and other performances of the battery are further improved.
The cell 2 may be a cell having a capacity of less than 30Ah, and the capacity of the cell 2 may be, for example, 2Ah, 5Ah, 8Ah, 10Ah, 13Ah, 15Ah, 18Ah, 20Ah, 23Ah, 25Ah, 28Ah, 30Ah, or a range of any two of them.
In contrast, with the small cell, the cell 2 is convenient to suck electrolyte, the liquid retention amount (the liquid retention amount is equal to the ratio of the mass of the electrolyte injected into the accommodating area 110 to the capacity of the cell 2) is improved, that is, more electrolyte is retained, and the battery performance is further optimized.
The embodiment of the utility model can measure the capacity of the battery cell by adopting a conventional method in the field, for example, adopting a conventional charge-discharge cabinet and other equipment, fully charging the battery at a 1C multiplying power under normal temperature, and then discharging the battery at the 1C multiplying power (namely, 100% DOD (depth of discharge is 100%), thereby measuring the capacity of the battery cell.
Specifically, the cell 2 may be square, such as rectangle or square, but not limited thereto, and may be of other regular or irregular structures.
Further, the battery cell 2 may be a wound battery cell or a laminated battery cell, and is not particularly limited. Specifically, as shown in fig. 6, the battery cell 2 includes a first electrode slice 201, a second electrode slice 202, and a separator 3 between the first electrode slice 201 and the second electrode slice 202, wherein the polarities of the first electrode slice 201 and the second electrode slice 202 are opposite, i.e. one of them is a positive electrode slice, the other is a negative electrode slice, for example, the first electrode slice 201 is a positive electrode slice, and the second electrode slice 202 is a negative electrode slice.
In specific implementation, the first pole piece 201, the diaphragm 3 and the second pole piece 202 may be sequentially stacked and wound to form a winding structure, so as to obtain the winding type battery cell 2, or sequentially stacked according to the sequence of the first pole piece 201, the diaphragm 3 and the second pole piece 202, so as to form the laminated type battery cell 2.
As shown in fig. 6, the first tab is connected to the first pole piece 201, and the second tab is connected to the second pole piece 202.
As shown in fig. 1, 3-5, the first and second tab portions 21 and 22 may specifically extend from a sealed edge (e.g., the top sealed edge 11) where the first and second tab portions 21 and 22 are located between the first and second side portions 111 and 112.
Specifically, as shown in fig. 1 and fig. 3 to 5, the first tab further includes a first inner tab 100, one end of the first inner tab 100 is connected to the battery cell 2, the other end of the first inner tab 100 is connected to the first tab 21, the second tab further includes a second inner tab 200, one end of the second inner tab 200 is connected to the battery cell 2, and the other end of the second inner tab 200 is connected to the second tab 22.
Specifically, FIG. 5 is region Q of FIG. 1 2 A schematic cross-sectional view (i.e., the region from which the tab extends), see fig. 5, the first tab portion 21 includes a first built-in portion 211 and a first extension The portion 212, the battery core 2 (the first pole piece 201), the first inner tab 100, the first inner portion 211 and the first outer portion 212 are sequentially connected, the first inner portion 211 is located in the seal area 10, the first side portion 111 of the seal area 10, the first inner portion 211 and the second side portion 112 of the seal area 10 are sequentially stacked, and the first outer portion 212 is a portion of the first tab portion 21 extending out of the package body, that is, the first outer portion 212 is located outside the package body, that is, the first outer portion 212 is located on one side, away from the accommodating area 110, of the seal area 10.
Specifically, the second tab portion 22 includes a second inner portion and a second outer portion (not shown in the drawing), where the battery cell 2 (the second pole piece 202), the second inner tab 200, the second inner portion and the second outer portion are sequentially connected, the second inner portion is located in the seal area 10, the second side 111 of the seal area 10, the second inner portion and the second side 112 of the seal area 10 are sequentially stacked, and the second outer portion is a portion of the second tab portion 22 extending out of the package body, that is, the second outer portion is located outside the package body, that is, the second outer portion is located on a side of the seal area 10 facing away from the accommodating area 110.
As shown in fig. 1, 3 and 6, the first inner tab 100 and the second inner tab 200 may be located on the same side of the battery core 2, for example, on the side of the battery core 2 facing the top sealing edge 11, so that the first tab portion 21 and the second tab portion 22 extend out of the package body from the top sealing edge 11 respectively.
Specifically, the first inner tab 100 and the first tab 21 may be welded (specifically, welded to the first inner portion 221 of the first tab 21) so that the first inner tab 100 and the first tab 21 are electrically connected, that is, the first tab 21 may be a first adaptor welded to the first inner tab 100, and as a joint between the battery and an electronic product using the battery, the first adaptor may be connected to the electronic product through the first outer portion 212 of the first tab 21.
Specifically, the second inner tab 200 and the second tab 22 may be welded (specifically, welded to the second built-in portion of the second tab 22) so that the second inner tab 200 and the second tab 22 are electrically connected, that is, the second tab 22 is a second adaptor welded to the second inner tab 200, and the second adaptor is used as a joint for connecting the battery and an electronic product using the battery, and specifically, the second adaptor can be connected to the electronic product through the second extension portion of the second tab 22.
In addition, the extending directions of the first inner tab 100 and the first tab portion 21 may be the same, and the first inner tab 100 and the first tab portion 21 may specifically extend along the direction from the battery core 2 to the seal area 10, that is, the first inner tab 100, the first tab portion 21, and the first tab formed by the two are respectively in a flat structure and are not bent basically. In particular, the first inner tab 100 and the first tab portion 21 may be directly welded, i.e. both are not bent, so as to form a first tab with a flat structure.
The length direction of the first tab, the length direction of the first inner tab 100, the length direction of the first tab 21, the direction from the first built-in portion 211 to the first outer portion 212, the direction from the battery cell 2 to the seal area 10, and the first direction are substantially parallel to each other.
In addition, the extending directions of the second inner tab 200 and the second tab portion 22 may be the same, and the second inner tab 200 and the second tab portion 22 may specifically extend along the direction from the battery cell 2 to the seal area 10, that is, the second inner tab 200, the second tab portion 22, and the second tab formed by the two are respectively in a flat structure and are not bent basically. In particular, the second inner tab 200 and the second tab 22 may be welded directly, i.e. both are not bent, to form a second tab with a flat structure.
The length direction of the second tab, the length direction of the second inner tab 200, the length direction of the second tab 22, the direction from the second built-in portion to the second outer portion, the direction from the battery cell 2 to the seal area 10, and the first direction are substantially parallel to each other.
In addition, as shown in fig. 3 and 4, a protective adhesive layer 23 is provided on the surface of a connection portion 210 between the first tab portion 21 (first built-in portion 211) and the first inner tab 100, and at the connection portion 210, a protective adhesive layer 23 is provided on each of a surface of the first inner tab 100 facing away from the first tab portion 21 and a surface of the first tab portion 21 facing away from the first inner tab 100. The connection portion 210 may be specifically a welding portion between the first tab portion 21 and the first inner tab portion 100, and is generally formed with a welding mark (such as a bump, etc.), and by providing the surface of the connection portion with the protective layer 23, the generated welding mark structure such as a bump, etc. can be prevented from damaging the battery assembly such as the package, etc., thereby further improving the performance such as the safety and the service life of the battery.
In addition, the surface of the connection part 220 between the second inner tab 200 and the second tab 22 (second built-in part) is also provided with a protective adhesive layer 23, and at the connection part 220, one surface of the second inner tab 200 facing away from the second tab 22 and one surface of the second tab 22 facing away from the second inner tab 200 are respectively provided with a protective adhesive layer 23. The connection portion 220 may be specifically a welding portion between the second electrode lug 22 and the second inner electrode lug 200, and is generally formed with a welding mark (such as a bump, etc.), and by providing the surface of the connection portion with the protective layer 23, the generated welding mark structure such as a bump, etc. can be prevented from damaging the battery assembly such as the package, etc., thereby further improving the safety and the service life of the battery.
The protective layer 23 may be made of a conventional adhesive material in the art, such as a conventional tab adhesive.
Generally, as shown in fig. 6, the battery core 2 may include a plurality of first pole pieces 201 and a plurality of second pole pieces 202, where each first pole piece 201 is provided with a first sub-tab 2011, the first sub-tabs 2011 of the first pole pieces 201 are connected together to form a first inner tab 100, and each second pole piece 202 is provided with a second sub-tab 2021, and the second sub-tabs 2021 of the second pole pieces 202 are connected together to form a second inner tab 200.
The separator 3 is used for spacing the first pole piece 201 and the second pole piece 202 to prevent the first pole piece 201 and the second pole piece 202 from being in contact with a short circuit, and as shown in fig. 6, the separator 3 includes at least two third side portions 31, and a bent portion 32 connecting every two adjacent third side portions 31, each third side portion 31 being located between the first pole piece 201 and the second pole piece 202 to space the first pole piece 201 and the second pole piece 202, thereby forming the battery cell 2 in a Z-shaped lamination manner. The diaphragm 3 may be specifically folded to form the third side portion 31 and the bending portion 32, where the third side portion 31 may be specifically a straight portion (i.e. a flat structure), the bending portion 32 is a curved structure, the third side portion 31 and the bending portion 32 of the diaphragm 3 are distributed along a third direction, and the first pole piece 201, the third side portion 31 of the diaphragm 3, and the second pole piece 202 are distributed along the third direction.
Specifically, as shown in fig. 6, the separator 3 includes at least one repeating unit including three third side portions 31 and two bending portions 32, wherein the first third side portion 31, the first bending portion 32, and the second third side portion 31 are sequentially connected and surrounded to form a first region 310, and the second third side portion 31, the second bending portion 32, and the third side portion 31 are sequentially connected and surrounded to form a second region 320, in the order of distribution along the third direction; the first pole piece 201 is positioned within the first region 310 (generally not beyond the opening of the first region 310) and the second pole piece 202 is positioned within the second region 320 (generally not beyond the opening of the second region 320) to achieve spacing of the first pole piece 201 and the second pole piece 202 through the third side 31.
Wherein when the separator 3 includes a plurality of repeating units distributed in the third direction, two adjacent repeating units share one third side portion 31, i.e., the third side portion 31 of the previous repeating unit is the first third side portion 31 of the next repeating unit in the order of distribution in the third direction.
As shown in fig. 6, the first sub-tab 2011 of the first pole piece 201 located in the first area 310 extends from the first bending portion 32, that is, the first sub-tab 2011 penetrates through the bending portion 32, the bending portion 32 has a notch 30 through which the first sub-tab 2011 penetrates, and the second sub-tab 2021 of the second pole piece 202 located in the second area 320 extends from the opening of the second area 320, so that the first sub-tab 2011 and the second sub-tab 2021 are located on the same side of the battery cell 2.
The material of the positive electrode tab may be aluminum (i.e., the positive electrode tab is an aluminum electrode tab), and the material of the negative electrode tab may be a copper nickel plating material (i.e., the negative electrode tab is a copper nickel plating electrode tab), but is not limited thereto.
In addition, the battery may include a lithium ion battery, but is not limited thereto.
Specifically, the positive electrode sheet includes a positive electrode current collector and a positive electrode active layer provided on at least one surface of the positive electrode current collector, wherein the positive electrode active layer includes a positive electrode active material, a first conductive agent, and a first binder, the positive electrode active material may be in a range of 90% to 98% by mass, for example, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98% or any two thereof, the first conductive agent may be in a range of 1% to 5% by mass, for example, 1%, 2%, 3%, 4%, 5% or any two thereof, and the first binder may be in a range of 1% to 5% by mass, for example, 1%, 2%, 3%, 4%, 5% or any two thereof.
The positive electrode active layer is arranged on one surface of the positive electrode current collector, or the positive electrode active layer is arranged on both the front surface and the back surface of the positive electrode current collector. The positive electrode current collector may include aluminum foil, and the positive electrode active material may include one or more of lithium iron phosphate (LFP), lithium cobaltate, lithium manganate, lithium nickelate, lithium nickel cobalt manganate, lithium manganese iron phosphate, lithium vanadium phosphate, lithium vanadyl phosphate, lithium-rich manganese-based material, and lithium nickel cobalt aluminate.
In addition, the above-described anode sheet includes an anode current collector and an anode active layer provided on at least one surface of the anode current collector, the anode active layer includes an anode active material, a second conductive agent, and a second binder, wherein the mass percentage of the anode active material may be 86% to 98%, for example, 86%, 88%, 90%, 93%, 95%, 98%, or a range composed of any two of them, the mass percentage of the second conductive agent may be 1% to 7%, for example, 1%, 2%, 3%, 4%, 5%, 6%, 7%, or a range composed of any two of them, and the mass percentage of the second binder may be 1% to 7%, for example, 1%, 2%, 3%, 4%, 5%, 6%, 7%, or a range composed of any two of them.
Wherein, it can be that a negative electrode active layer is arranged on one surface of the negative electrode current collector, or negative electrode active layers are arranged on both negative and opposite surfaces of the negative electrode current collector. The negative electrode current collector may include a copper foil, the negative electrode active material may include one or more of graphite, mesophase carbon microspheres, soft carbon, hard carbon, silicon material, silicon oxygen material, silicon carbon material, and the graphite may include artificial graphite and/or natural graphite.
In addition, the anode active layer may further include a thickener including, for example, sodium carboxymethyl cellulose.
Illustratively, the first and second conductive agents may include one or more of conductive carbon black, acetylene black, carbon nanotubes, conductive graphite, graphene, etc., respectively, and the first and second binders may include one or more of polyvinylidene fluoride (PVDF), a copolymer of vinylidene fluoride-hexafluoropropylene, polyamide, polyacrylonitrile, polyacrylate, polyacrylic acid, polyacrylate, polyvinylpyrrolidone, polyvinyl ether, polymethyl methacrylate, polytetrafluoroethylene, polyhexafluoropropylene, and Styrene Butadiene Rubber (SBR), respectively.
The battery may further include an electrolyte solution, which may include an organic solvent including one or more of ethylene carbonate, dimethyl carbonate, and 1, 2-propylene carbonate, and a lithium salt including lithium hexafluorophosphate, for example, in a concentration of the lithium salt in the electrolyte solution ranging from about 1mol/L to 1.5mol/L, for example, 1mol/L, 1.2mol/L, 1.3mol/L, 1.4mol/L, 1.5mol/L, or any two thereof, but is not limited thereto.
The electrode sheet and the battery of the utility model can be prepared by a conventional method in the art, for example, a coating method is adopted to prepare the positive electrode sheet and the negative electrode sheet, namely, corresponding active materials, conductive agents, binders and other materials are mixed with solvents to prepare slurry, and then the slurry is coated on a current collector, and the corresponding electrode sheet is prepared through procedures of drying, rolling and the like. Then, the bare cell 2 may be formed in the Z-type lamination manner, or the wound bare cell 2 may be formed by winding, then the adaptor (the first tab portion 21) is welded on the positive electrode tab (the first inner tab portion 100) of the positive electrode sheet, the second adaptor (the second tab portion 22) is welded on the negative electrode tab (the second inner tab portion 200)) may be welded, so as to rotate out the positive electrode tab and the negative electrode tab, the battery cell 2 may be packaged by the package, and the electrolyte may be injected into the accommodating area 110, and then the battery may be manufactured through the steps of formation, aging, and the like.
The present application is further described by way of specific examples below.
(1) Preparation of positive plate
Mixing lithium iron phosphate, PVDF and conductive carbon black, and uniformly stirring and dispersing at a high speed to prepare a first mixture; in the first mixture, the mass percent of lithium iron phosphate is 95wt%, the mass percent of PVDF is 2wt%, and the mass percent of conductive carbon black is 3wt%;
Mixing the first mixture with N-methylpyrrolidone (NMP) to prepare a positive electrode slurry, wherein the solid content of the positive electrode slurry is 50wt%;
the positive electrode slurry is uniformly coated on the front and back surfaces of an aluminum foil, and the positive electrode plate (the thickness of the positive electrode plate is within 140 mu m) is obtained through drying and roller press compaction.
(2) Preparation of negative electrode sheet
Mixing artificial graphite, PVDF, aziridine (cross-linking agent), sodium carboxymethylcellulose and conductive carbon black, and uniformly stirring and dispersing at a high speed to obtain a second mixture; in the second mixture, the mass percentage of the artificial graphite is 95 percent, the mass percentage of the sodium carboxymethyl cellulose is 1.5 percent, the mass percentage of the conductive carbon black is 1.5 percent, and the mass percentage of the PVDF is 2 percent;
mixing the second mixture with water to prepare a negative electrode slurry, wherein the solid content of the negative electrode slurry is 50wt%;
and uniformly coating the negative electrode slurry on the front and back surfaces of the copper foil, and drying and compacting by a roller press to obtain a negative electrode plate (the thickness of the negative electrode plate is within 90 mu m).
(3) Battery assembly
The battery structure is shown in fig. 1 to 9, and the preparation process is as follows:
the positive electrode plate (the first electrode plate 201), the diaphragm 3 and the negative electrode plate (the second electrode plate 202) are manufactured into a bare cell 2 (or wound to form the bare cell 2) in a Z-shaped lamination mode;
Welding first sub-tabs (aluminum tabs) 2011 of positive electrode plate(s) in the battery cell 2 together to form a first inner tab 100, and welding second sub-tabs (copper nickel plated tabs) 2021 of negative electrode plate(s) in the battery cell 2 together to form a second inner tab 200; welding the first inner tab 100 with the first tab portion 21 to form a first tab, and welding the second inner tab 200 with the second tab portion 22 (width about 20mm, thickness about 0.2 mm) to form a second tab, so as to rotate out the positive tab and the negative tab, respectively; wherein the first tab portion (first adapter) 21A width of about 20mm, a thickness of about 0.2mm, and a cross-sectional area parallel to the thickness direction of the first tab portion 21 of about 4mm 2 (i.e. 20mm x 0.2mm = 4 mm) 2 ) A width of the second electrode ear (second adapter) 22 is about 20mm, a thickness is about 0.2mm, and a cross-sectional area parallel to a thickness direction of the second electrode ear 22 is about 4mm 2 (i.e. 20mm x 0.2mm = 4 mm) 2 ))；
Clamping the bare cell 2 by using a glass clamp with the strength of 100MPa/m 2 Baking at 85 ℃ for 24 hours in vacuum, packaging by using an aluminum plastic film with the thickness of 153 mu m, and injecting electrolyte into a containing area 110 containing the battery cell 2, wherein the electrolyte consists of an organic solvent and lithium hexafluorophosphate, the organic solvent is formed by mixing ethylene carbonate, dimethyl carbonate and 1,2 propylene glycol carbonate according to the volume ratio of 1:1:1, and the concentration of the lithium hexafluorophosphate in the electrolyte is 1.1mol/L;
Wherein, the length of the battery cell is about 130mm, the width is about 110mm, and the thickness is about 4.5mm; the capacity of the cell was about 5Ah, and the ratio of the cross-sectional area of the first tab portion 21 parallel to the thickness direction of the first tab portion 21 to the capacity of the cell was about 0.8mm 2 /Ah, the ratio of the cross-sectional area of the second electrode lug 22 parallel to the thickness direction of the second electrode lug 22 to the capacity of the battery cell is about 0.8mm 2 /Ah；
Wherein the aluminum plastic film comprises a PET layer with a thickness of about 12 μm and a third bonding layer 106 (the ratio of the mass of the third bonding layer 106 to the area of the PET layer (or nylon layer) facing the third bonding layer 106 is about 3.3 g/m) 2 ) A nylon layer having a thickness of about 15 μm, a second adhesive layer 104 (the ratio of the mass of the second adhesive layer 104 to the area of the nylon layer (or aluminum layer) facing the second adhesive layer 104 is about 3.3 g/m) 2 ) A soft aluminum layer having a thickness of about 38.43 μm, an APP layer (PPa) having a thickness of about 40 μm, and a PP layer (heat seal layer 101) having a thickness of about 40 μm, wherein a surface of the soft aluminum layer facing the second adhesive layer 104 (a surface thereof facing the nylon layer) is a rough surface, and a surface of the soft aluminum layer facing the APP layer (a surface thereof facing the PP layer) is a smooth surface;
specifically, fig. 9 is a Scanning Electron Microscope (SEM) image of the plastic-aluminum film used, and it can be seen that the distance from the side of the PET layer facing away from the Nylon layer (Nylon) to the side of the Nylon layer facing away from the PET layer is about 35.4 μm (the distances between two different areas are 35.52 μm and 35.30 μm, respectively), the distance from the side of the APP layer facing the soft aluminum layer to the side of the PP layer facing away from the APP layer is about 80.96 μm, and the distance from the side of the PET layer facing away from the Nylon layer to the side of the PP layer facing away from the APP layer (package thickness) is about 152.62 μm.
Packaging by heat sealing to close the accommodating area 110, wherein the heat sealing layer 101 of the first side 111 and the heat sealing layer 101 of the second side 112 of the sealing area 10 are combined into a whole (i.e. form the connecting layer 108 as shown in fig. 2); wherein the thickness T of the connection layer 108 3 Thickness T of APP layer (first adhesive layer 102) of the first side portion of about 50 μm 1 Thickness T of APP layer (first adhesive layer 102) of second side portion of about 40 μm 2 About 40 μm, the thickness of the seal area 10 is about 235 μm, the width of the seal area 10 (effective seal area) of the top seal 11 is 2mm, and the width of the seal area 10 of the side seal 12 is 2mm;
and then carrying out treatments such as formation, aging and the like to obtain the square soft package battery, wherein the length of the battery is 140mm, the width of the battery is 145mm, and the thickness of the battery is 14mm.
The high-temperature high-humidity acceleration test result shows that the battery can meet the service life of more than 8 years, namely, after the battery is used for more than 8 years, the battery can still keep higher power performance and other performances. The high-temperature high-humidity acceleration test process comprises the following steps: at normal temperature, the battery cell is charged to full charge (100% soc), and the battery cell is placed in a high-temperature (65 ℃) high-humidity (relative humidity 95%) box body to perform an acceleration test, and the package life (equivalent factor af=40.83) of the battery cell at normal temperature is calculated according to the high-temperature storage time, for example: storage at 60 ℃ for 71.6 days under a Relative Humidity (RH) of 95% corresponds to storage at normal temperature for 71.6x40.83++365=8 years;
According to the accelerated experimental process, the battery is stored for 71.6 days under the conditions of 60 ℃ and 95% Relative Humidity (RH), then is charged to 50% SOC at-30 ℃, the impedance DCR increase rate is calculated after 10 seconds of discharge, and the measured DCR increase rate is less than 5%, which is equivalent to the power performance decay rate of the battery within 15% after 8 years of storage.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.
Claims (11)
1. A battery is characterized by comprising a battery cell and a packaging body for packaging the battery cell, wherein the battery cell is provided with a first tab, the first tab comprises a first tab part extending out of the packaging body, and the ratio of the cross section area of the first tab part parallel to the thickness direction of the first tab part to the capacity of the battery cell is greater than or equal to 0.6mm 2 /Ah。
2. The battery according to claim 1, wherein the battery cell is further provided with a second electrode tab including a second electrode tab protruding from the package body, a ratio of a cross-sectional area of the second electrode tab parallel to a thickness direction of the second electrode tab to a capacity of the battery cell being greater than or equal to 0.6mm 2 /Ah。
3. The battery according to claim 2, wherein the first tab is a positive electrode tab, and a ratio of a cross-sectional area of the first tab parallel to a thickness direction of the first tab to a capacity of the battery cell is greater than or equal to 0.7mm 2 /Ah。
4. The battery according to claim 1, wherein the first tab is a positive electrode tab, and a ratio of a cross-sectional area of the first tab parallel to a thickness direction of the first tab to a capacity of the battery cell is greater than or equal to 0.7mm 2 /Ah。
5. The battery of claim 1, wherein the package comprises a first support layer, a third adhesive layer, a second support layer, a second adhesive layer, a metal layer, a first adhesive layer, and a heat seal layer that are stacked; the packaging body comprises a containing area and a sealing area for sealing the containing area, and the battery cell is positioned in the containing area; the package has a first side and a second side, the heat seal layer of the first side of the seal area being connected to the heat seal layer of the second side of the seal area.
6. The battery of claim 5, wherein the heat seal layer of the first side of the seal area is integral with the heat seal layer of the second side of the seal area; and/or the number of the groups of groups,
the first adhesive layer comprises an acid modified polypropylene layer; and/or the number of the groups of groups,
the heat seal layer comprises a polypropylene layer; and/or the number of the groups of groups,
the first support layer comprises a polyester layer; and/or the number of the groups of groups,
the second support layer comprises a nylon layer; and/or the number of the groups of groups,
the metal layer comprises an aluminum layer; and/or the number of the groups of groups,
the roughness of the side of the metal layer facing the second adhesive layer is greater than the roughness of the side of the metal layer facing the first adhesive layer.
7. The battery of claim 5, wherein the battery is configured to provide the battery with a battery cell,
the thickness of the seal area is 210-260 mu m; and/or the number of the groups of groups,
the width of the seal area is more than or equal to 2mm.
8. The battery of any of claims 1-7, wherein the thickness of the encapsulant is greater than 90 μιη.
9. The battery of any of claims 1-7, wherein the cell is a cell having a capacity of less than 30 Ah.
10. The battery of claim 1, wherein a ratio of a thickness of the cell to a capacity of the cell is less than 4mm/Ah.
11. The battery according to claim 1 or 10, wherein,
the volume of the battery cell is 240cm 3 ～302cm 3 ；
And/or the length of the battery cell is 100-250 mm, and/or the width of the battery cell is 80-150 mm, and/or the thickness of the battery cell is 3-15 mm.
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| CN202322071731.2U CN220797023U (en) | 2023-08-02 | 2023-08-02 | Battery cell |
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| CN202322071731.2U CN220797023U (en) | 2023-08-02 | 2023-08-02 | Battery cell |
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