CN113471637A - Battery, battery module and electronic device - Google Patents
Battery, battery module and electronic device Download PDFInfo
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- CN113471637A CN113471637A CN202110744967.0A CN202110744967A CN113471637A CN 113471637 A CN113471637 A CN 113471637A CN 202110744967 A CN202110744967 A CN 202110744967A CN 113471637 A CN113471637 A CN 113471637A
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- 230000004308 accommodation Effects 0.000 claims abstract description 14
- 239000010410 layer Substances 0.000 claims description 44
- -1 polypropylene Polymers 0.000 claims description 20
- 239000012790 adhesive layer Substances 0.000 claims description 14
- 239000004677 Nylon Substances 0.000 claims description 5
- 239000004698 Polyethylene Substances 0.000 claims description 5
- 239000004642 Polyimide Substances 0.000 claims description 5
- 239000004743 Polypropylene Substances 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- 229920001778 nylon Polymers 0.000 claims description 5
- 229920003207 poly(ethylene-2,6-naphthalate) Polymers 0.000 claims description 5
- 229920000573 polyethylene Polymers 0.000 claims description 5
- 239000011112 polyethylene naphthalate Substances 0.000 claims description 5
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 5
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 5
- 229920001721 polyimide Polymers 0.000 claims description 5
- 229920001155 polypropylene Polymers 0.000 claims description 5
- 229920005989 resin Polymers 0.000 claims description 5
- 239000011347 resin Substances 0.000 claims description 5
- 238000004804 winding Methods 0.000 description 28
- 238000005452 bending Methods 0.000 description 25
- 238000000034 method Methods 0.000 description 10
- 230000008569 process Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000004080 punching Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000005549 size reduction Methods 0.000 description 2
- 239000013585 weight reducing agent Substances 0.000 description 2
- 239000002390 adhesive tape Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/528—Fixed electrical connections, i.e. not intended for disconnection
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/572—Means for preventing undesired use or discharge
- H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
- H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
- H01M50/597—Protection against reversal of polarity
-
- 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
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The embodiment of the application provides a battery, a battery module and an electronic device. The battery includes an electrode assembly and a case. Electrode assembly includes main part and the first utmost point ear of being connected with the main part, and first utmost point ear of portion buckle to set up, defines out first space between main part and the first utmost point ear, and first utmost point ear of portion defines out the second space, and second space and first space are located the different sides of first utmost point ear. The case forms an accommodation space in which the electrode assembly is disposed. The case at one side of the electrode assembly includes a first part and a second part connected to the first part in a thickness direction of the battery, at least a portion of the first part is disposed in the second space, and a thickness of the first part is less than a thickness of the second part.
Description
Technical Field
The present disclosure relates to electrochemical devices, and particularly to a battery, a battery module and an electronic device.
Background
This section provides background information related to the present disclosure only and is not necessarily prior art.
The existing battery adopting the folded tab structure comprises a flexible package shell (such as an aluminum-plastic composite film shell and the like) and an electrode assembly packaged in the shell, wherein the electrode assembly comprises a main body and a tab part with a large bending structure, the tab part is further connected with an adapter, and the adapter extends out of the shell.
In the battery, the tab part and the main body of the electrode assembly are in the same space, so that the main body and the tab part have a large short circuit risk under extreme working conditions. Some manufacturers add adhesive tape between the main body of the electrode assembly and the tab part to cover a part of the structure of the tab part in order to solve the above-mentioned short circuit risk problem. The use of the adhesive paper not only increases the manufacturing cost of the battery, but also the adhesive paper is easy to fall off under the soaking of the electrolyte, and once the adhesive paper falls off, the short circuit risk can not be reduced.
Disclosure of Invention
The embodiment of the application provides a battery, a battery module and an electronic device, which can effectively reduce the risk of short circuit between a tab part and a main body of an electrode assembly.
Embodiments of a first aspect of the present application provide a battery including an electrode assembly and a case. The electrode assembly comprises a main body part and a first pole lug part connected with the main body part, and the first pole lug part is arranged in a bending mode. The main body portion and the first tab portion define a first space therebetween, and the first tab portion defines a second space therebetween. The case forms an accommodation space in which the electrode assembly is disposed. The case at one side of the electrode assembly includes a first portion and a second portion connected to the first portion in a thickness direction of the battery. At least one part of the first part is arranged in the second space, and the thickness of the first part is smaller than that of the second part.
According to the battery of the embodiment of the application, the electrode assembly comprises the main body part and the first pole ear part connected with the main body part, wherein the main body part and the first pole ear part define a first space therebetween, and the first pole ear part defines a second space in the shape of the first pole ear part. In addition, the case located at one side of the electrode assembly in the thickness direction of the battery includes a first portion and a second portion connected to the first portion. Wherein at least a part of the first portion is arranged in the second space and the thickness of the first portion is smaller than that of the second portion, which means that, for the housing on that side, the first portion is extended to a certain extent during the formation, which extension occurs during the extension of at least part of the structure of the first portion into the second space. Because the at least partial structure of first portion extends to the second space, first portion will form limiting displacement to first utmost point ear in the direction of being close to or keeping away from the main part so to reduce the risk that first utmost point ear inserts in the main part, and then reduce the short circuit risk between first utmost point ear and the main part.
In some embodiments, the first tab portion includes a plurality of sub-tabs respectively connected with the body portion.
In some embodiments, the case includes a first case part on which an accommodation groove for accommodating the electrode assembly is formed, and a second case part defining an accommodation space together.
In some embodiments, the first tab part includes a first bent section, a first section, a second bent section, and a second section connected in sequence. The first bending section is connected with the main body part, a first space is defined among the first section, the first bending section and the main body part, and a second space is defined among the first section, the second bending section and the second section.
In some embodiments, the battery further includes an adaptor coupled to the first tab, the adaptor extending from the receiving space outside the housing.
In some embodiments, the battery further includes a first adhesive layer disposed at the junction of the first pole ear and the interposer and adhered to the housing.
The first adhesive layer can cover the joint of the first pole lug part and the adapter, so that the risk that the joint pierces the shell is reduced; also can improve the effort between first utmost point ear and adaptor and the casing, improve stability.
In some embodiments, the housing includes a first layer, a metal layer, and a second layer disposed in a stack, the first layer being closer to the receiving space than the second layer. In some embodiments, the first layer comprises at least one of polypropylene or polyethylene. In some embodiments, the second layer comprises at least one of polyethylene terephthalate, polyethylene naphthalate, nylon resin, or polyimide.
In some embodiments, the main body portion is wound, and the first tab portion is connected to a portion of the main body portion on one side of the winding center plane.
In some embodiments, the electrode assembly further includes a second pole ear portion connected to the main body portion, the second pole ear portion being connected to the same side of the main body portion as the first pole ear portion, the first pole ear portion and the second pole ear portion having opposite polarities.
Embodiments of a second aspect of the present application provide a battery including an electrode assembly and a case. The electrode assembly comprises a main body part and a first tab part connected with the main body part, the first tab part is bent, and a first space is defined between the main body part and the first tab part. The case forms an accommodation space in which the electrode assembly is disposed, and the case at one side of the electrode assembly includes a first portion and a second portion connected to the first portion in a thickness direction of the battery, at least a portion of the first portion being disposed in the first space, and a thickness of the first portion being less than a thickness of the second portion. In some embodiments, the first tab portion includes a plurality of sub-tabs respectively connected with the body portion.
In some embodiments, the case includes a first case part on which an accommodation groove for accommodating the electrode assembly is formed, and a second case part defining an accommodation space together.
In some embodiments, the first tab portion includes a first section and a first bent section connected in sequence, the first bent section is connected to the main body portion, and a first space is defined between the first section, the first bent section and the main body portion.
In some embodiments, the battery further includes an adaptor coupled to the first tab, the adaptor extending from the receiving space outside the housing.
In some embodiments, the battery further includes a first adhesive layer disposed at the junction of the first pole ear and the interposer and adhered to the housing.
In some embodiments, the housing includes a first layer, a metal layer, and a second layer disposed in a stack, the first layer being closer to the receiving space than the second layer. In some embodiments, the first layer comprises at least one of polypropylene or polyethylene. In some embodiments, the second layer comprises at least one of polyethylene terephthalate, polyethylene naphthalate, nylon resin, or polyimide.
In some embodiments, the main body portion is wound, and the first tab portion is connected to a portion of the main body portion on one side of the winding center plane.
In some embodiments, the electrode assembly further includes a second pole ear portion connected to the main body portion, the second pole ear portion being connected to the same side of the main body portion as the first pole ear portion, the first pole ear portion and the second pole ear portion having opposite polarities.
An embodiment of the third aspect of the present application proposes a battery module including at least two batteries of any one of the above embodiments, a plurality of the batteries being stacked in a thickness direction of the batteries.
In some embodiments, the battery module further includes a buffer member disposed between two adjacent batteries.
An embodiment of a fourth aspect of the present application provides an electronic device, including the battery module in any one of the above embodiments.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related art, the drawings used in the description of the embodiments of the present application or the related art are briefly introduced below. It is apparent that the drawings in the following description are only some embodiments of the present application, and that other drawings may be derived from those drawings by those skilled in the art.
Fig. 1 is a schematic structural diagram of a battery according to an embodiment of the present application;
FIG. 2 is an enlarged view of portion B of FIG. 1;
FIG. 3 is a schematic view of a housing of an embodiment of the present application in an expanded state;
fig. 4 is a schematic structural view of a main body portion of an electrode assembly according to an embodiment of the present application;
FIG. 5 is a schematic diagram of a layer structure of a housing according to an embodiment of the present disclosure;
FIG. 6 is a schematic diagram of a battery according to another embodiment of the present application;
fig. 7 is a schematic structural diagram of a battery module according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present disclosure.
As shown in fig. 1 to 3, an embodiment of a first aspect of the present application proposes a battery 10. The battery 10 includes an electrode assembly 100 and a case 200. The electrode assembly 100 includes a main body portion 110 and a first tab portion 120 connected to the main body portion 110, the first tab portion 120 is bent, a first space S1 is defined between the main body portion 110 and the first tab portion 120, and a second space S2 is defined by the first tab portion 120. The case 200 forms an accommodation space in which the electrode assembly 100 is disposed. In the thickness direction of battery 10, case 200 located at one side of electrode assembly 100 includes first portion 201 and second portion 202 connected to first portion 201, at least a portion of first portion 201 is disposed in second space S2 to define first pole ear portion 120 in a direction approaching or separating from main body portion 110, and the thickness of first portion 201 is smaller than the thickness of second portion 202.
It should be understood that the first space S1 and the second space S2 are both open spaces (may be also understood as virtual spaces), and do not refer to closed spaces surrounded by solid structures.
According to the battery 10 of the embodiment of the present application, the electrode assembly 100 thereof includes the main body part 110 and the first tab part 120 connected to the main body part 110, wherein the main body part 110 and the first tab part 120 define a first space S1 therebetween, and the first tab part 120 defines a second space S2 on a different side from the first tab part 120 with respect to the first space S1 in its own shape. In addition, the case 200 located at one side of the electrode assembly 100 in the thickness direction of the battery 10 includes a first portion 201 and a second portion 202 connected to the first portion 201. Wherein at least a part of the first portion 201 is disposed in the second space S2 and the thickness of the first portion 201 is smaller than that of the second portion 202, which means that, for the case 200 of this side, the first portion 201 undergoes a certain degree of extension during formation, which occurs during at least a part of the structure of the first portion 201 extends to the second space S2. Since at least a part of the structure of the first portion 201 extends to the second space S2, the first portion 201 can limit the first pole ear portion in a direction approaching to or departing from the main body portion 110, so as to reduce the risk of the first pole ear portion 120 (especially the position of a in fig. 1) being inserted backwards into the main body portion 110, and further reduce the risk of short circuit between the first pole ear portion 120 and the main body portion 110.
Further, as shown in fig. 4, the main body portion 110 is formed by sequentially winding or stacking a first pole piece 1101, a separator 1102, and a second pole piece 1103, wherein the polarities of the first pole piece 1101 and the second pole piece 1103 are opposite. Specifically, the first pole piece 1101 may be a cathode pole piece, and may also be an anode pole piece, and accordingly, the second pole piece 1103 may be an anode pole piece or a cathode pole piece. It is understood that, when the main body part 110 of the electrode assembly 100 is formed by sequentially winding the first pole piece 1101, the separator 1102, and the second pole piece 1103, the main body part 110 is in a winding type structure; when the main body part 110 of the electrode assembly 100 is formed by sequentially stacking the first pole piece 1101, the separator 1102, and the second pole piece 1103, the main body part 110 is a stacked structure. That is, the body portion 110 of the electrode assembly 100 in the embodiment of the present application may be wound or stacked, which is not limited in the present application.
In some embodiments of the present application, the first pole ear portion 120 includes a plurality of sub-tabs 1201, and the plurality of sub-tabs 1201 are respectively connected to the main body portion 110. The first pole ear portion 120 may be a tab connected to the first pole piece 1101 and having the same polarity as the first pole piece 1101, or may be a tab connected to the second pole piece 1103 and having the same polarity as the second pole piece 1103. Taking the main body 110 of the electrode assembly 100 in a winding structure as an example, the electrode assembly 100 is formed by sequentially winding the first pole piece 1101, the separator 1102 and the second pole piece 1103. The first pole piece portion 120 may be connected to the first pole piece 1101 or the second pole piece 1103, in the former case, each sub-tab 1201 of the first pole piece portion 120 is connected to a different winding layer of the first pole piece 1101, and in the latter case, each sub-tab 1201 of the first pole piece portion 120 is connected to a different winding layer of the second pole piece 1103. Further, a plurality of sub-tabs 1201 may be arranged in sequence in the thickness direction of the cell 10.
In some embodiments of the present application, the first portion 201 may be a recess formed by performing a punching process on the surface of the case 200, and the recess protrudes in a direction of the case 200 located at the other side of the electrode assembly 100 after the battery 10 is assembled. The mode of extending the partial structure of the housing 200 through the punching process to form the first portion 201 is convenient to implement, and the processed first portion 201 can meet the limit requirement on the first tab portion 120, so that the risk of short circuit between the first tab portion 120 and the main body portion 110 is reduced.
In some embodiments of the present application, the case 200 includes a first case part 210 and a second case part 220 connected to the first case part 210, a receiving part 211 for receiving the electrode assembly 100 is formed on the first case part 210, and the receiving part 211 and the second case part 220 together define a receiving space for receiving the electrode assembly 100.
In some embodiments of the present application, the first pole ear portion 120 includes a first bending portion 121, a first segment 122, a second bending portion 123 and a second segment 124, which are sequentially connected, the first bending portion 121 is connected to the main body portion 110, a first space S1 is defined between the first segment 122, the first bending portion 121 and the main body portion 110, and a second space S2 is defined between the first segment 122, the second bending portion 123 and the second segment 124. In this embodiment, the first pole ear portion 120 includes a first bending section 121, a first section 122, a second bending section 123 and a second section 124 connected in sequence, a second space S2 is defined between the first section 122, the second bending section 123 and the second section 124, and at least a portion of the first portion 201 is disposed in the second space S2. Because the existence of second bending segment 123 for formed great bending structure between first section 122 and the second section 124, from this, first portion 201 extends to in this bending structure, thereby forms limiting displacement to first utmost point ear portion 120, thereby guarantees that battery 10 under extreme operating mode, also can reduce the risk that first utmost point ear portion 120 fall and insert into main part 110, and then reduces the short circuit risk between first utmost point ear portion 120 and the main part 110.
In some embodiments of the present application, battery 10 further includes an adaptor 300 coupled to first electrode tab portion 120, adaptor 300 extending from the receiving space to the outside of case 200, adaptor 300 for leading first electrode tab portion 120 out of case 200 so as to electrically connect electrode assembly 100 with components outside case 200.
In some embodiments of the present application, battery 10 further includes a first adhesive layer 400, where first adhesive layer 400 is disposed at the junction of first pole ear portion 120 and interposer 300 and adheres to housing 200. In assembling battery 10 into battery module 1, the first tab portion 120 may be bent, for example, by changing the size of the bending angle (the bending angle of second bending section 123), or by bending the connection portion between adaptor 300 and first tab portion 120 to adjust the lead-out angle of adaptor 300. In this embodiment, a first adhesive layer 400 is further disposed at the joint of the first tab portion 120 and the adaptor 300, and the first adhesive layer 400 is adhered to the housing 200, the arrangement of the first adhesive layer 400 can increase the connection firmness between the adaptor 300 and the first tab portion 120, and is favorable for maintaining the relative position relationship between the first tab portion 120 and the housing 200, so as to further reduce the risk of short circuit between the first tab portion 120 and the main body portion 110, and furthermore, the top sealing region of the housing 200 (the region where the adaptor 300 is led out from the housing 200) can be bent at will, so as to conveniently assemble the battery 10 into the battery module 1.
In some embodiments of the present application, as shown in fig. 5, the housing 200 includes a first layer 260, a metal layer 270, and a second layer 280, which are stacked, the first layer 260 being closer to the accommodating space than the second layer 280. In some embodiments, the first layer 260 comprises at least one of polypropylene or polyethylene. In some embodiments, the second layer 280 comprises at least one of polyethylene terephthalate, polyethylene naphthalate, nylon resin, or polyimide.
In some embodiments of the present application, the main body portion 110 is disposed in a winding manner (i.e., the main body portion 110 is formed by sequentially winding the first pole piece 1101, the separator 1102 and the second pole piece 1103), and the first pole ear portion 120 is connected to a portion of the main body portion 110 on one side of the winding center plane P1. That is, the sub-tab 1201 included in the first pole ear portion 120 is connected to the main body portion 110 on the side of the winding center plane P1, which is advantageous in reducing the thickness of the first pole ear portion 120, thereby being advantageous in satisfying the design requirements of the battery 10 for weight reduction and size reduction. Here, the winding center plane P1 is a plane passing through the winding center of the winding structure and perpendicular to the thickness direction of the battery 10.
In some embodiments of the present application, electrode assembly 100 further includes a second pole ear portion 130 coupled to main body portion 110, second pole ear portion 130 coupled to the same side of main body portion 110 as first pole ear portion 120, first pole ear portion 120 and second pole ear portion 130 being of opposite polarity. Specifically, if the first pole ear portion 120 is connected to the second pole piece 1103 of the main body portion 110, the second pole ear portion 130 is connected to the first pole piece 1101 of the main body portion 110, and at this time, the first pole ear portion 120 is an anode in polarity and the second pole ear portion 130 is a cathode in polarity. Conversely, if the first pole ear portion 120 is connected to the first pole piece 1101 of the main body portion 110, the second pole ear portion 130 is connected to the second pole piece 1103 of the main body portion 110, and at this time, the first pole ear portion 120 is a cathode in polarity and the second pole ear portion 130 is an anode in polarity.
It is understood that second pole ear 130 can also include a first bend, a first segment, a second bend, and a second segment, that is, second pole ear 130 can be of similar construction to first pole ear 120. On this basis, the first space may be defined between the second pole ear portion 130 and the main body portion 110, the second pole ear portion 130 may define a second space, and at least a portion of the first portion 201 of the housing 200 may be disposed in the second space defined by the second pole ear portion 130.
Further, the second pole ear portion 130 may include a plurality of sub-tabs 1301, and the plurality of sub-tabs 1301 are respectively connected to the main body portion 110. Taking the main body 110 of the electrode assembly 100 in a winding structure as an example, the electrode assembly 100 is formed by sequentially winding the first pole piece 1101, the separator 1102 and the second pole piece 1103. Second pole ear portion 130 is connected to second pole piece 1103 when first pole ear portion 120 is connected to first pole piece 1101, and conversely, second pole ear portion 130 is connected to first pole piece 1101 when first pole ear portion 120 is connected to second pole piece 1103. In the former case, the sub-tabs 1301 of the second pole ear portion 130 are connected to different winding layers of the second pole piece 1103, and in the latter case, the sub-tabs 1301 of the second pole ear portion 130 are connected to different winding layers of the first pole piece 1101. Further, a plurality of sub-tabs 1301 may be arranged in sequence in the thickness direction of the cell 10.
As shown in fig. 6, the embodiment of the second aspect of the present application proposes a battery 10, which is different from the battery of the first aspect of the present application in that the first portion 201 is disposed at a different position. Specifically, the battery 10 of the embodiment of the present application includes an electrode assembly 100 and a case 200. The electrode assembly 100 includes a main body portion 110 and a first tab portion 120 connected to the main body portion 110, the first tab portion 120 is bent, and a first space S1 is defined between the main body portion 110 and the first tab portion 120. The case 200 forms an accommodation space in which the electrode assembly 100 is disposed. In the thickness direction of battery 10, case 200 located at one side of electrode assembly 100 includes first portion 201 and second portion 202 connected to first portion 201, at least a portion of first portion 201 is disposed in first space S1 to space first pole ear portion 120 from main body portion 110, and the thickness of first portion 201 is smaller than the thickness of second portion 202.
According to the battery 10 of the embodiment of the present application, the electrode assembly 100 thereof includes the main body portion 110 and the first tab portion 120 connected to the main body portion 110, wherein the main body portion 110 and the first tab portion 120 define a first space S1 therebetween. In addition, in the thickness direction of the battery 10, the case 200 located at one side of the electrode assembly 100 includes the first portion 201 and the second portion 202 connected to the first portion 201, wherein at least a portion of the first portion 201 is disposed in the first space S1 and the thickness of the first portion 201 is smaller than that of the second portion 202, which means that, with respect to the case 200 at the one side, the first portion 201 undergoes a certain degree of extension during the formation, which occurs during at least a part of the structure of the first portion 201 extends to the first space S1. Since at least a part of the structure of the first portion 201 extends to the first space S1, the first portion 201 can separate the first pole ear portion 120 from the main body portion 110, so that the risk of the first pole ear portion 120 (especially, the position a in fig. 1) being inserted into the main body portion 110 in a reversed manner can be reduced, and the risk of short circuit between the first pole ear portion 120 and the main body portion 110 can be reduced.
In some embodiments of the present application, the first pole ear portion 120 includes a first segment 122 and a first bent segment 121 connected in series, wherein the first bent segment 121 is connected with the main body portion 110. A first space S1 is defined between the first segment 122, the first bending segment 121 and the main body 110. Thus, when at least a part of the structure of the first portion 201 extends to the first space S1, the first pole ear portion 120 and the main body portion 110 can be spaced apart, thereby reducing the risk of the first pole ear portion 120 being inserted upside down into the main body portion 110.
Further, as shown in fig. 4, the main body portion 110 is formed by sequentially winding or stacking a first pole piece 1101, a separator 1102, and a second pole piece 1103, wherein the polarities of the first pole piece 1101 and the second pole piece 1103 are opposite. Specifically, the first pole piece 1101 may be a cathode pole piece, and may also be an anode pole piece, and accordingly, the second pole piece 1103 may be an anode pole piece or a cathode pole piece. It is understood that, when the main body part 110 of the electrode assembly 100 is formed by sequentially winding the first pole piece 1101, the separator 1102, and the second pole piece 1103, the main body part 110 is in a winding type structure; when the main body part 110 of the electrode assembly 100 is formed by sequentially stacking the first pole piece 1101, the separator 1102, and the second pole piece 1103, the main body part 110 is a stacked structure. That is, the body portion 110 of the electrode assembly 100 in the embodiment of the present application may be wound or stacked, which is not limited in the present application.
In some embodiments of the present application, the first pole ear portion 120 includes a plurality of sub-tabs 1201, and the plurality of sub-tabs 1201 are respectively connected to the main body portion 110. The first pole ear portion 120 may be a tab connected to the first pole piece 1101 and having the same polarity as the first pole piece 1101, or may be a tab connected to the second pole piece 1103 and having the same polarity as the second pole piece 1103. Taking the main body 110 of the electrode assembly 100 in a winding structure as an example, the electrode assembly 100 is formed by sequentially winding the first pole piece 1101, the separator 1102 and the second pole piece 1103. The first pole piece portion 120 may be connected to the first pole piece 1101 or the second pole piece 1103, in the former case, each sub-tab 1201 of the first pole piece portion 120 is connected to a different winding layer of the first pole piece 1101, and in the latter case, each sub-tab 1201 of the first pole piece portion 120 is connected to a different winding layer of the second pole piece 1103. Further, a plurality of sub-tabs 1201 may be arranged in sequence in the thickness direction of the cell 10.
In some embodiments of the present application, the first portion 201 is a recess formed by performing a punching process on the surface of the case 200, and the recess protrudes in a direction of the case 200 located at the other side of the electrode assembly 100 after the battery 10 is assembled. This kind of mode that makes the local structure of casing 200 take place to extend through the processing of dashing the pit to form first portion 201 is relatively convenient for implementation, and the first portion 201 that processes can satisfy the spacing demand to first utmost point ear portion 120, thereby reduces the short circuit risk between first utmost point ear portion 120 and the main part 110.
In some embodiments of the present application, the case 200 includes a first case part 210 and a second case part 220 connected to the first case part 210, a receiving part 211 for receiving the electrode assembly 100 is formed on the first case part 210, and the receiving part 211 and the second case part 220 together define a receiving space for receiving the electrode assembly 100.
In some embodiments of the present application, battery 10 further includes an adaptor 300 coupled to first electrode tab portion 120, adaptor 300 extending from the receiving space to the outside of case 200, adaptor 300 for leading first electrode tab portion 120 out of case 200 so as to electrically connect electrode assembly 100 with components outside case 200.
In some embodiments of the present application, battery 10 further includes a first adhesive layer 400, where first adhesive layer 400 is disposed at the junction of first pole ear portion 120 and interposer 300 and adheres to housing 200. In assembling battery 10 into battery module 1, the first tab portion 120 may be bent, for example, by changing the size of the bending angle (the bending angle of second bending section 123), or by bending the connection portion between adaptor 300 and first tab portion 120 to adjust the lead-out angle of adaptor 300. In this embodiment, the first adhesive layer 400 is further disposed at the joint of the first pole ear portion 120 and the adaptor 300, and the first adhesive layer 400 is adhered to the housing 200, so that the first adhesive layer 400 can increase the connection firmness between the adaptor 300 and the first pole ear portion 120, and is favorable for maintaining the relative position relationship between the first pole ear portion 120 and the housing 200, thereby further reducing the risk of short circuit between the first pole ear portion 120 and the main body portion 110.
In some embodiments of the present application, as shown in fig. 5, the housing 200 includes a first layer 260, a metal layer 270, and a second layer 280, which are stacked, the first layer 260 being closer to the accommodating space than the second layer 280. In some embodiments, the first layer 260 comprises at least one of polypropylene or polyethylene. In some embodiments, the second layer 280 comprises at least one of polyethylene terephthalate, polyethylene naphthalate, nylon resin, or polyimide.
In some embodiments of the present application, the main body portion 110 is disposed in a winding manner (i.e., the main body portion 110 is formed by sequentially winding the first pole piece 1101, the separator 1102 and the second pole piece 1103), and the first pole ear portion 120 is connected to a portion of the main body portion 110 on one side of the winding center plane P1. That is, the sub-tab 1201 included in the first pole ear portion 120 is connected to the main body portion 110 on the side of the winding center plane P1, which is advantageous in reducing the thickness of the first pole ear portion 120, thereby being advantageous in satisfying the design requirements of the battery 10 for weight reduction and size reduction. Here, the winding center plane P1 is a plane passing through the winding center of the winding structure and perpendicular to the thickness direction of the battery 10.
In some embodiments of the present application, electrode assembly 100 further includes a second pole ear portion 130 coupled to main body portion 110, second pole ear portion 130 coupled to the same side of main body portion 110 as first pole ear portion 120, first pole ear portion 120 and second pole ear portion 130 being of opposite polarity. Specifically, if the first pole ear portion 120 is connected to the second pole piece 1103 of the main body portion 110, the second pole ear portion 130 is connected to the first pole piece 1101 of the main body portion 110, and at this time, the first pole ear portion 120 is an anode in polarity and the second pole ear portion 130 is a cathode in polarity. Conversely, if the first pole ear portion 120 is connected to the first pole piece 1101 of the main body portion 110, the second pole ear portion 130 is connected to the second pole piece 1103 of the main body portion 110, and at this time, the first pole ear portion 120 is a cathode in polarity and the second pole ear portion 130 is an anode in polarity.
It is understood that second pole ear portion 130 can also include a first bend segment and a first segment, that is, second pole ear portion 130 can be of similar construction to first pole ear portion 120. In addition, a first space may be defined between the second pole ear portion 130 and the main body portion 110, and at least a part of the structure of the first portion 201 of the housing 200 may be disposed in the first space defined by the second pole ear portion 130 and the main body portion 110.
Further, the second pole ear portion 130 may include a plurality of sub-tabs 1301, and the plurality of sub-tabs 1301 are respectively connected to the main body portion 110. Taking the main body 110 of the electrode assembly 100 in a winding structure as an example, the electrode assembly 100 is formed by sequentially winding the first pole piece 1101, the separator 1102 and the second pole piece 1103. Second pole ear portion 130 is connected to second pole piece 1103 when first pole ear portion 120 is connected to first pole piece 1101, and conversely, second pole ear portion 130 is connected to first pole piece 1101 when first pole ear portion 120 is connected to second pole piece 1103. In the former case, the sub-tabs 1301 of the second pole ear portion 130 are connected to different winding layers of the second pole piece 1103, and in the latter case, the sub-tabs 1301 of the second pole ear portion 130 are connected to different winding layers of the first pole piece 1101. Further, a plurality of sub-tabs 1301 may be arranged in sequence in the thickness direction of the cell 10.
As shown in fig. 7, the embodiment of the third aspect of the present application proposes a battery module 1, and the battery module 1 includes the battery 10 in the embodiment of the first aspect described above, and/or the battery 10 in the embodiment of the second aspect described above. Also, in the thickness direction of the battery 10, a plurality of batteries 10 are stacked.
According to the battery module 1 of the embodiment of the present application, since the same inventive concept as that of the battery 10 in the embodiment of the first aspect or the second aspect described above is applied, all the advantageous effects of the battery 10 in the embodiment of the first aspect described above can be obtained, or all the advantageous effects of the battery 10 in the embodiment of the second aspect described above can be obtained.
Further, when the battery 10 is the battery in the embodiment of the first aspect described above, at least a portion of the first portion 201 of the case 200 is disposed in the second space S2, a seal region for leading out the adaptor 300 connected to the first pole ear portion 120 is formed between the first portion 201 and the case 200 on the other side of the electrode assembly 100, and the seal region can be bent relatively easily. Under the condition that a plurality of batteries 10 are stacked in the thickness direction, the top sealing area can be bent, so that the adaptor 300 is as close as possible to the center position of the batteries 10 in the thickness direction, and the risk of short circuit caused by too small distance between the adaptors 300 of different batteries 10 is favorably reduced.
In some embodiments of the present application, the battery module 1 further includes a buffer member 20 disposed between two adjacent batteries 10. Therefore, the vibration resistance of the battery module 1 can be increased, and the battery module 1 can be protected from damage under the condition of external force impact.
In some embodiments of the present application, the battery module 1 further includes an insulating foam 30 disposed between the adjacent batteries 10, and the insulating foam 30 separates the adaptors 300 of different batteries 10, thereby ensuring that no contact occurs between the adjacent adaptors 300.
An embodiment of a fourth aspect of the present application provides an electronic device, including the battery module 1 in any of the above embodiments.
Further, the electronic device may be, for example, a mobile phone, a tablet computer, an electronic reader, a notebook computer, a power device, an energy storage device, a wearable device, and the like.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
All the embodiments in the present specification are described in a related manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments.
The above description is only for the preferred embodiment of the present application, and is not intended to limit the scope of the present application. Any modification, equivalent replacement, improvement and the like made within the principle of the present application are included in the protection scope of the present application.
Claims (14)
1. A battery, comprising:
the electrode assembly comprises a main body part and a first tab part connected with the main body part, wherein the first tab part is bent, a first space is defined between the main body part and the first tab part, and a second space is defined between the first tab part and the main body part;
and a case forming an accommodation space, the electrode assembly being disposed in the accommodation space, the case including a first portion and a second portion connected to the first portion on one side of the electrode assembly in a thickness direction of the battery, at least a portion of the first portion being disposed in the second space, a thickness of the first portion being less than a thickness of the second portion.
2. A battery, comprising:
the electrode assembly comprises a main body part and a first tab part connected with the main body part, wherein the first tab part is bent, and a first space is defined between the main body part and the first tab part;
a case forming an accommodation space, the electrode assembly being disposed in the accommodation space, the case including a first portion and a second portion connected to the first portion on one side of the electrode assembly in a thickness direction of the battery, at least a portion of the first portion being disposed in the first space, a thickness of the first portion being less than a thickness of the second portion.
3. The battery according to claim 1 or 2, wherein the first tab portion includes a plurality of sub-tabs respectively connected with the main body portion.
4. The battery according to claim 1 or 2, wherein the case includes first and second case portions, and a receiving groove for receiving the electrode assembly is formed on the first case portion, the receiving groove and the second case portion together defining the receiving space.
5. The battery according to claim 2, wherein the first tab portion includes a first section and a first bent section connected in series, the first bent section being connected to the main body portion, the first space being defined between the first section, the first bent section, and the main body portion.
6. The battery according to claim 1, wherein the first tab portion includes a first bent section, a first section, a second bent section, and a second section connected in sequence, the first bent section being connected to the main body portion to define the first space between the first section, the first bent section, and the main body portion, and the second space between the first section, the second bent section, and the second section.
7. The battery of claim 1 or 2, further comprising an adaptor connected to the first tab, the adaptor extending from the receiving space outside the housing.
8. The battery of claim 7, further comprising a first adhesive layer disposed at the junction of the first pole ear and the interposer and adhered to the housing.
9. The battery according to claim 1 or 2, wherein the case includes a first layer, a metal layer, and a second layer that are arranged in a stack, the first layer being closer to the accommodation space than the second layer;
the first layer comprises at least one of polypropylene or polyethylene;
the second layer includes at least one of polyethylene terephthalate, polyethylene naphthalate, nylon resin, or polyimide.
10. The battery according to claim 3, wherein the main body portion is wound, and the first tab portion is connected to a portion of the main body portion on one side of a winding center plane.
11. The battery according to claim 1 or 2, wherein the electrode assembly further comprises a second pole ear portion connected to the main body portion, the second pole ear portion being connected to the same side of the main body portion as the first pole ear portion, the first pole ear portion being opposite in polarity to the second pole ear portion.
12. A battery module comprising at least two cells according to any one of claims 1 to 11, wherein a plurality of the cells are stacked in the thickness direction of the cells.
13. The battery module according to claim 12, further comprising a buffer member disposed between two adjacent batteries.
14. An electronic device characterized by comprising the battery module according to claim 12 or 13.
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| CN202110744967.0A CN113471637B (en) | 2021-06-30 | 2021-06-30 | Battery, battery module and electronic device |
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| CN113471637B (en) | 2024-01-09 |
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