CN218586054U - Battery cell and battery - Google Patents
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- CN218586054U CN218586054U CN202223028147.0U CN202223028147U CN218586054U CN 218586054 U CN218586054 U CN 218586054U CN 202223028147 U CN202223028147 U CN 202223028147U CN 218586054 U CN218586054 U CN 218586054U
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- 210000005056 cell body Anatomy 0.000 claims abstract description 35
- 239000012528 membrane Substances 0.000 claims description 34
- 238000004804 winding Methods 0.000 claims description 25
- 239000002390 adhesive tape Substances 0.000 claims description 12
- 210000004027 cell Anatomy 0.000 claims description 12
- -1 polyethylene Polymers 0.000 claims description 10
- 239000004698 Polyethylene Substances 0.000 claims description 8
- 229920000573 polyethylene Polymers 0.000 claims description 8
- 239000002131 composite material Substances 0.000 claims description 7
- 239000004642 Polyimide Substances 0.000 claims description 3
- 229920001721 polyimide Polymers 0.000 claims description 3
- 239000010410 layer Substances 0.000 abstract description 35
- 239000011241 protective layer Substances 0.000 abstract description 9
- 238000001125 extrusion Methods 0.000 abstract description 8
- 238000001467 acupuncture Methods 0.000 abstract description 4
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 7
- 229910001416 lithium ion Inorganic materials 0.000 description 7
- 239000004743 Polypropylene Substances 0.000 description 6
- 229920001155 polypropylene Polymers 0.000 description 6
- 238000013461 design Methods 0.000 description 5
- 230000005611 electricity Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 238000004146 energy storage Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000003860 storage Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 239000003792 electrolyte Substances 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000009778 extrusion testing Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000011076 safety test Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 208000032953 Device battery issue Diseases 0.000 description 1
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
Classifications
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- 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
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Secondary Cells (AREA)
Abstract
The utility model discloses an electric core and a battery, wherein the electric core comprises an electric core body and a second diaphragm, and the electric core body comprises a positive plate, a negative plate and a first diaphragm; after wrapping the ending ends of the positive plate and the negative plate, the first diaphragm is wound around the battery cell body so as to form a first diaphragm protective layer on the outermost layer of the battery cell body; one end of the second diaphragm is connected with the ending end of the first diaphragm, and the other end of the second diaphragm is wound around the battery cell body so as to form a second diaphragm protection layer on the outermost layer of the battery cell body; the second separator has a tensile strength in the transverse direction greater than that of the first separator. The utility model discloses an outmost second diaphragm that uses of electric core body that is formed with first diaphragm protective layer reforms second diaphragm protective layer, can improve electric core body tensile strength in horizontal side under the prerequisite that does not influence the electrochemical properties of battery, improved the anti extrusion and the acupuncture intensity of battery simultaneously for the battery has better thermal stability and security performance.
Description
Technical Field
The utility model relates to a lithium ion battery technical field especially relates to an electricity core and battery.
Background
The lithium ion battery has high energy density, high voltage, excellent cycle performance and small self-discharge, and is widely applied in the fields of electric vehicles and energy sources along with the reduction of cost and the further improvement of cycle life.
However, since the lithium ion battery generally uses flammable ethylene carbonate as a solvent, and the chemical activity of the charged graphite is close to that of metallic lithium, there is a possibility of thermal runaway in the case of abuse, for example, in the case of collision and extrusion, the lithium ion battery with insufficient safety design may smoke, fire, and even explode, thereby causing serious consequences on the personal safety and the property safety. The battery capacity of the electric automobile and energy storage is much larger than that of a consumer battery, which reaches hundreds of amperes (Ah), and the use condition is more complex, so the safety performance of the electric automobile and energy storage is more critical.
The diaphragm is an important part of the lithium ion battery, plays an important role in obstructing the electronic conductance of positive and negative electrodes in the battery and allowing an electrolyte example to freely pass so as to realize the ionic conduction, is an important determinant factor of the battery capacity, the cycle capacity and the safety performance, and meanwhile, the cost of the isolating membrane accounts for 15-20% of the total cost of the battery core, and the search for the isolating membrane with low cost and reliable performance is the development trend of the lithium ion battery. The Polyethylene (PE) and polypropylene (PP) diaphragm has higher porosity, lower resistance and better acid and alkali resistance, and is the first choice for the adoption of the current commercial lithium ion battery diaphragm.
The polypropylene (PP) diaphragm has higher melting point (more than 160 ℃), higher air permeability and obvious price advantage, but the polypropylene (PP) diaphragm has lower tensile strength in the transverse direction, and the diaphragm is easy to tear when the battery is transversely extruded, so that the short circuit of a cathode and an anode is caused, and the thermal runaway of the battery is caused.
Therefore, improvements in the prior art are needed.
The above information is given as background information only to aid in understanding the present disclosure, and does not establish or acknowledge whether any of the above is available as prior art to the present disclosure.
SUMMERY OF THE UTILITY MODEL
The utility model provides an electricity core and battery to solve the not enough of prior art.
In order to achieve the above object, the present invention provides the following technical solutions:
in a first aspect, an embodiment of the present invention provides an electrical core, including an electrical core body and a second diaphragm 4, where the electrical core body includes a positive plate 1, a negative plate 2, and a first diaphragm 3 disposed between the positive plate 1 and the negative plate 2; the first diaphragm 3 is wound around the battery cell body after wrapping the ending ends of the positive plate 1 and the negative plate 2, so that a first diaphragm protection layer is formed on the outermost layer of the battery cell body;
one end of the second diaphragm 4 is connected with the ending end of the first diaphragm 3, and the other end of the second diaphragm 4 is wound around the cell body so as to form a second diaphragm protection layer on the outermost layer of the cell body;
the tensile strength of the second separator 4 in the transverse direction is greater than the tensile strength of the first separator 3 in the transverse direction.
Further, in the battery core, the winding direction of the second membrane 4 is the same as that of the first membrane 3;
alternatively, the winding direction of the second separator 4 is opposite to the winding direction of the first separator 3.
Further, in the battery cell, one end of the second membrane 4 is connected with the terminating end of the first membrane 3 through a first adhesive tape 5.
Furthermore, in the battery core, the other end of the second diaphragm 4 is sealed by a second adhesive tape 6 after being wound.
Further, in the battery cell, the battery cell body is of a winding structure;
or the battery cell body is of a laminated structure;
or the battery cell body is of a laminated and wound composite structure.
Further, in the battery core, the number of winding layers of the second diaphragm 4 is 1-20.
Further, in the battery core, the thickness of the second diaphragm 4 is 5-20um.
Further, in the battery core, the width of the second membrane 4 is smaller than that of the first membrane 3;
alternatively, the width of the second membrane 4 is equal to the width of the first membrane 3.
Further, in the battery core, the second diaphragm 4 is made of polyethylene;
or the second diaphragm 4 is made of a polyethylene composite material;
alternatively, the second separator 4 is made of polyimide.
In a second aspect, an embodiment of the present invention provides a battery, including the electrical core as set forth in the above first aspect.
Compared with the prior art, the embodiment of the utility model provides a following beneficial effect has:
the embodiment of the utility model provides a pair of electricity core and battery, through the outmost second diaphragm that uses at the electricity core body that is formed with first diaphragm protective layer reform second diaphragm protective layer, can improve the tensile strength of electricity core body in horizontal side under the prerequisite that does not influence the electrochemical properties of battery, improved the anti extrusion and the acupuncture intensity of battery simultaneously for the battery has better thermal stability and security performance.
Drawings
In order to illustrate the embodiments of the present invention or the technical solutions in the prior art more clearly, the drawings used in the description of the embodiments or the prior art will be briefly introduced, obviously, the drawings in the description below are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an electrical core provided in an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a cell in the prior art;
reference numerals are as follows:
the negative plate comprises a positive plate 1, a negative plate 2, a first diaphragm 3, a second diaphragm 4, a first adhesive tape 5 and a second adhesive tape 6.
Detailed Description
To make the objects, features and advantages of the present invention more obvious and understandable, the embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the embodiments described below are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
In the description of the present invention, it is to be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present.
Furthermore, the terms "long", "short", "inner", "outer", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings, which are merely for convenience of description of the present invention, and do not indicate or imply that the device or element referred to must have the specific orientation, operate in the specific orientation configuration, and thus, should not be construed as limiting the present invention.
The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.
Example one
In view of the above-mentioned defects of the conventional cell structure, the applicant of the present invention is based on practical experience and professional knowledge that are abundant over many years in the design and manufacture of such products, and is engaged in the application of theory to actively make research and innovation, so as to hopefully create a technology capable of solving the defects in the prior art, so that the cell structure has higher practicability. Through continuous research and design, and after repeated trial sample and improvement, the utility model discloses the practical value of utensil is established in the end.
Referring to fig. 1, an embodiment of the present invention provides an electrical core, including an electrical core body and a second separator 4, where the electrical core body includes a positive plate 1, a negative plate 2, and a first separator 3 disposed between the positive plate 1 and the negative plate 2; the first diaphragm 3 is wound around the battery cell body after wrapping the ending ends of the positive plate 1 and the negative plate 2, so that a first diaphragm protection layer is formed on the outermost layer of the battery cell body;
one end of the second diaphragm 4 is connected with the ending end of the first diaphragm 3, and the other end of the second diaphragm 4 is wound around the cell body so as to form a second diaphragm protection layer on the outermost layer of the cell body;
the tensile strength of the second separator 4 in the transverse direction is greater than the tensile strength of the first separator 3 in the transverse direction.
Illustratively, the tensile strength of the second separator 4 in the transverse direction is 100 to 3200MPa.
In this embodiment, one end of the second membrane 4 is connected to the terminating end of the first membrane 3 by a first adhesive tape 5;
the other end of the second separator 4 is sealed by a second tape 6 after being wound.
It should be noted that, although the cell structure in the prior art is shown in fig. 2, it also includes a positive plate 1, a negative plate 2 and a first separator 3 disposed between the positive plate 1 and the negative plate 2, and the first separator 3 is wound around the cell body after wrapping the terminal ends of the positive plate 1 and the negative plate 2, so as to form a first separator protection layer on the outermost layer of the cell body, unlike the present embodiment, after the first separator protection layer is formed, the terminal end of the first separator 3 is sealed by the first adhesive tape 5, but the present embodiment further provides a second separator 4, and then one end of the second separator 4 is connected to the terminal end of the first separator 3 through the first adhesive tape 5, that is, in the present embodiment, the first adhesive tape 5 is not used for sealing the terminal end of the first separator 3, but is used for connecting to one end of the second separator 4, and then the second adhesive tape 4 is used for sealing the terminal end of the second separator 4, like the first adhesive tape 3, and the terminal end of the second separator 4 is used for improving the strength of the battery by extruding the second separator protection layer along the direction of the terminal end of the cell body, and the terminal end of the second separator 4.
In the present embodiment, the winding direction of the second separator 4 is the same as the winding direction of the first separator 3;
alternatively, the winding direction of the second separator 4 is opposite to the winding direction of the first separator 3.
In the present embodiment, the winding direction of the second separator 4 is not limited, and the second separator protection layer may be formed on the outermost layer of the cell body.
Of course, it is understood that, in addition to the above-mentioned case that the winding directions are the same or opposite, the winding direction of the second separator 4 may be changed from the same direction to the opposite direction or from the opposite direction to the same direction or from the same direction to the opposite direction.
In this embodiment, the cell body has a winding structure;
or the battery cell body is of a laminated structure;
or the battery cell body is of a laminated and wound composite structure.
It should be noted that, in this embodiment, there is no unique limitation on the cell body, that is, the composition structures between the positive plate 1, the negative plate 2 and the first diaphragm 3 disposed between the positive plate 1 and the negative plate 2 are not limited, and the cell body may be a winding structure, a laminated structure, or a laminated winding composite structure, as long as it is ensured that the first diaphragm 3 is wound around the cell body after wrapping the trailing ends of the positive plate 1 and the negative plate 2, so as to form the first diaphragm protection layer on the outermost layer of the cell body.
In this embodiment, the number of winding layers of the second separator 4 is 1 to 20.
The number of winding layers of the second separator 4 may be arbitrarily selected within a range of 1 to 20 layers.
For example, the number of winding layers of the second separator 4 may be 6, for example.
In this embodiment, the thickness of the second membrane 4 is 5-20um.
It should be noted that the thickness of the second membrane 4 can be arbitrarily selected within the interval of 5-20um.
Preferably, the thickness of the second membrane 4 may further be optimized in the interval of 5-15um, i.e. the thickness of the second membrane 4 is preferably chosen arbitrarily in the interval of 5-15 um.
Illustratively, the thickness of the second membrane 4 is, for example, 12um.
In the present embodiment, the width of the second membrane 4 is smaller than the width of the first membrane 3;
alternatively, the width of the second membrane 4 is equal to the width of the first membrane 3.
For example, the width of the second membrane 4 can be selected to be equal to the width of the first membrane 3.
In this embodiment, the material of the second diaphragm 4 is polyethylene;
or, the second diaphragm 4 is made of a polyethylene composite material;
alternatively, the second separator 4 is made of polyimide.
In addition to the above materials, other materials having high tensile strength and not reacting with the electrolyte may be selected as the material of the second separator 4.
In order to prove the feasibility of the scheme provided by the embodiment, the battery cells designed as described above are manufactured into batteries, five batteries are taken as experimental examples to perform extrusion safety test, and the test results are recorded. The comparative examples were the batteries in which the cell body was not subjected to secondary winding, i.e., the batteries not including the second separator 4, and five batteries not including the second separator 4 were also subjected to a crush safety test, and the test results were recorded.
The extrusion safety method comprises the following steps: charging to 3.65V at constant current and constant voltage of 0.5C and cutoff current less than or equal to 0.05C at the ambient temperature of 20 +/-5 ℃; and (3) applying pressure in a direction perpendicular to the direction of the battery cell according to the extrusion speed of 1mm/s by using a semi-cylinder with the radius of 75mm, and gradually increasing and maintaining the pressure by 50KN until the pressure is invalid, wherein the initial pressure is 50KN, and each pressure is maintained for 10min. The results of the extrusion test for the five experimental examples and the five comparative examples are shown in table 1 below:
table 1: results of extrusion test of five experimental examples and five comparative examples
In the above table, the results of the tests of the experimental example and the comparative example were obtained that, when the second separator having high tensile strength was wound on the surface of the cell body, the deformation amount of the battery failure in the crush test of the battery was increased by 30%, and the failure pressure was increased by 50KN.
Although the terms of the positive electrode sheet, the negative electrode sheet, the first separator, the second separator, the first tape, the second tape, and the like are used more frequently, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any one of the additional limitations of the present invention.
The embodiment of the utility model provides a pair of electric core, through the outmost second diaphragm that uses at the electric core body that is formed with first diaphragm protective layer reform second diaphragm protective layer, can improve electric core body tensile strength in horizontal side under the prerequisite that does not influence the electrochemical properties of battery, improved the anti extrusion and the acupuncture intensity of battery simultaneously for the battery has better thermal stability and security performance.
Example two
An embodiment of the utility model provides a battery, include as above-mentioned embodiment one electric core.
It should be noted that the battery further includes necessary component designs such as a case, an electrolyte, and a top cover, and the specific functions of these component designs are to ensure that each function of the secondary battery works normally.
In addition, the battery in the present embodiment may be applied to, but not limited to, electronic devices, electric vehicles, or electric power storage systems. The electronic device may be, for example, various computers, mobile phones, display screens, and the like, which use a battery as a driving power source. The electric vehicle may be, for example, an electric vehicle, an electric tricycle, an electric bicycle, or the like, which uses a battery as a driving power source. The power storage system may be, for example, a power storage system that uses a battery as a power storage source.
In these electronic devices, the battery may be electrically connected to the electric element to supply the electric element with electric power. Because the quick charge ability of the battery that this application provided is comparatively excellent, be favorable to like this that electronic equipment is arranged in application scenes such as outdoor energy storage, short-time power reserve and mobile energy storage to make electronic equipment's application scene more extensive.
The embodiment of the utility model provides a pair of battery, through the outmost second diaphragm that uses at the electric core body that is formed with first diaphragm protective layer reform second diaphragm protective layer, can improve electric core body at the ascending tensile strength of horizontal side under the prerequisite that does not influence the electrochemical properties of battery, improved the anti extrusion and the acupuncture intensity of battery simultaneously for the battery has better thermal stability and security performance.
The foregoing description of the embodiments has been presented for the purposes of illustration and description. It is not intended to be exhaustive or to limit the disclosure. Individual elements or features of a particular embodiment are generally not limited to that particular embodiment, but, where applicable, are interchangeable and can be used in a selected embodiment, even if not specifically shown or described. The same elements or features may also vary in many respects. Such variations are not to be regarded as a departure from the disclosure, and all such modifications are intended to be included within the scope of the disclosure.
Example embodiments are provided so that this disclosure will be thorough and will fully convey the scope to those skilled in the art. Numerous details are set forth, such as examples of specific parts, devices, and methods, in order to provide a thorough understanding of embodiments of the present disclosure. It will be apparent to those skilled in the art that specific details need not be employed, that example embodiments may be embodied in many different forms and that neither should be construed to limit the scope of the disclosure. In certain example embodiments, well-known processes, well-known device structures, and well-known technologies are not described in detail.
Terminology is used herein for the purpose of describing particular example embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates to the contrary. The terms "comprises" and "comprising" are intended to be inclusive and therefore specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order discussed and illustrated, unless explicitly indicated as an order of performance. It should also be understood that additional or alternative steps may be employed.
When an element or layer is referred to as being "on," "8230," "over," "with," "8230," "bonding," "connected to," or "coupled to" another element or layer, it can be directly on, bonded to, connected to, or coupled to the other element or layer, or intervening elements or layers may also be present. In contrast, when an element or layer is referred to as being "directly on" \8230; \8230, over "," with "\8230; \8230, directly bonded to", "directly connected to", or "directly coupled to" another element or layer, there may be no intervening elements or layers present. Other words used to describe the relationship of elements should be interpreted in a similar manner (e.g., "on 8230; \8230between" and "directly on 8230; \8230between," "adjacent" and "directly adjacent," etc.). As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items. Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region or section from another element, component, region or section. Unless clearly indicated by the context, use of terms such as the terms "first," "second," and other numerical values herein does not imply a sequence or order. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.
Spatially relative terms, such as "inner," "outer," "underlying," "below," "in 8230," "below," "lower," "above," "upper," etc., may be used herein for ease of description to describe a relationship between one element or feature and another element or feature or elements as illustrated in the figures. Spatially relative terms may be intended to encompass different orientations of the device in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "below" \8230; \8230 "", may encompass both an upward and downward orientation. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors herein interpreted.
Claims (10)
1. An electric core comprises an electric core body, wherein the electric core body comprises a positive plate (1), a negative plate (2) and a first diaphragm (3) arranged between the positive plate (1) and the negative plate (2); the first diaphragm (3) wraps the ending ends of the positive plate (1) and the negative plate (2) and is wound around the battery cell body to form a first diaphragm protection layer on the outermost layer of the battery cell body, and the battery cell is characterized by further comprising a second diaphragm (4);
one end of the second diaphragm (4) is connected with the ending end of the first diaphragm (3), and the other end of the second diaphragm (4) is wound around the cell body so as to form a second diaphragm protection layer on the outermost layer of the cell body;
the tensile strength of the second membrane (4) in the transverse direction is greater than the tensile strength of the first membrane (3) in the transverse direction.
2. The electrical core of claim 1, wherein the winding direction of the second separator (4) is the same as the winding direction of the first separator (3);
or the winding direction of the second membrane (4) is opposite to the winding direction of the first membrane (3).
3. The electrical core according to claim 1, characterized in that one end of the second membrane (4) is connected to the trailing end of the first membrane (3) by means of a first adhesive tape (5).
4. The electrical core according to claim 3, wherein the other end of the second separator (4) is sealed by a second adhesive tape (6) after being wound.
5. The battery cell of claim 1, wherein the cell body is a coiled structure;
or the battery cell body is of a laminated structure;
or, the battery cell body is of a laminated winding composite structure.
6. The electrical core according to claim 1, characterized in that the number of winding layers of the second separator (4) is 1-20.
7. The electrical core according to claim 1, wherein the thickness of the second separator (4) is 5-20um.
8. The electrical core of claim 1, wherein the width of the second membrane (4) is smaller than the width of the first membrane (3);
alternatively, the width of the second membrane (4) is equal to the width of the first membrane (3).
9. The electrical core according to claim 1, wherein the second membrane (4) is made of polyethylene;
or the second diaphragm (4) is made of a polyethylene composite material;
or the second diaphragm (4) is made of polyimide.
10. A battery comprising the cell of any of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223028147.0U CN218586054U (en) | 2022-11-15 | 2022-11-15 | Battery cell and battery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223028147.0U CN218586054U (en) | 2022-11-15 | 2022-11-15 | Battery cell and battery |
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| CN218586054U true CN218586054U (en) | 2023-03-07 |
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| CN202223028147.0U Active CN218586054U (en) | 2022-11-15 | 2022-11-15 | Battery cell and battery |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118763294A (en) * | 2024-09-06 | 2024-10-11 | 宁德时代新能源科技股份有限公司 | Cell molding method and battery manufacturing method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118763294A (en) * | 2024-09-06 | 2024-10-11 | 宁德时代新能源科技股份有限公司 | Cell molding method and battery manufacturing method |
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Address after: 215500 No. 68, Xin'anjiang Road, Southeast street, Changshu, Suzhou, Jiangsu Patentee after: Jiangsu Zhengli New Energy Battery Technology Co.,Ltd. Country or region after: China Address before: 215500 No. 68, Xin'anjiang Road, Southeast street, Changshu, Suzhou, Jiangsu Patentee before: Jiangsu Zenergy Battery Technologies Co.,ltd Country or region before: China |
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