CN118380719A - Battery, charge-discharge module and electronic equipment - Google Patents
Battery, charge-discharge module and electronic equipment Download PDFInfo
- Publication number
- CN118380719A CN118380719A CN202410549197.8A CN202410549197A CN118380719A CN 118380719 A CN118380719 A CN 118380719A CN 202410549197 A CN202410549197 A CN 202410549197A CN 118380719 A CN118380719 A CN 118380719A
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- Prior art keywords
- battery
- separator
- foil
- layer
- coating
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- 239000011888 foil Substances 0.000 claims abstract description 113
- 239000011248 coating agent Substances 0.000 claims abstract description 64
- 238000000576 coating method Methods 0.000 claims abstract description 64
- 239000013543 active substance Substances 0.000 claims abstract description 14
- 238000003487 electrochemical reaction Methods 0.000 claims abstract description 8
- 125000006850 spacer group Chemical group 0.000 claims description 39
- 238000002955 isolation Methods 0.000 claims description 24
- 238000005538 encapsulation Methods 0.000 claims description 23
- 238000004806 packaging method and process Methods 0.000 claims description 21
- 239000011810 insulating material Substances 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 2
- 239000011149 active material Substances 0.000 abstract description 15
- 238000010030 laminating Methods 0.000 abstract 1
- 210000004027 cell Anatomy 0.000 description 92
- 229910052782 aluminium Inorganic materials 0.000 description 12
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 10
- 239000004743 Polypropylene Substances 0.000 description 9
- 239000000463 material Substances 0.000 description 9
- 239000003792 electrolyte Substances 0.000 description 6
- 239000002985 plastic film Substances 0.000 description 6
- 229920006255 plastic film Polymers 0.000 description 6
- 238000003466 welding Methods 0.000 description 5
- 239000010406 cathode material Substances 0.000 description 4
- 239000011257 shell material Substances 0.000 description 4
- 238000007789 sealing Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000005486 organic electrolyte Substances 0.000 description 2
- -1 polypropylene Polymers 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 210000004460 N cell Anatomy 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000010405 anode material Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000007779 soft material Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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
- Connection Of Batteries Or Terminals (AREA)
Abstract
The invention discloses a battery, a charge-discharge module and electronic equipment. The battery comprises a shell, a separator and an electric core; the isolating piece is arranged in the shell, and the edge of the isolating piece is connected with the shell so as to divide a plurality of accommodating cavities in the shell; the battery core is formed by laminating a plurality of pole pieces, and each battery core is respectively positioned in each accommodating cavity; at least one side of the isolating piece is provided with a first coating part, the first coating part is provided with a first active substance, a pole piece which is located at the outermost side of the battery cell and is opposite to the isolating piece is set to be a first pole piece, one side of the first pole piece, which is close to the isolating piece, is provided with a second coating part, the second coating part is provided with a second active substance, and the first active substance and the second active substance can perform electrochemical reaction. The battery further increases the energy density of the battery by providing a foil on the separator and coating the active material to enable the separator to react electrochemically with the cells.
Description
Technical Field
The present invention relates to the field of battery technologies, and in particular, to a battery, a charging/discharging module, and an electronic device.
Background
For some high-power electronic devices, such as unmanned aerial vehicles, notebook computers, cameras and the like, a single battery core cannot meet the power consumption requirement of the high-power electronic devices, and a plurality of batteries are required to be connected in series, in parallel or in series-parallel so as to achieve the output power required by the devices. But series or parallel batteries occupy a larger space and have a lower energy density. For this reason, a scheme of disposing a plurality of battery cells in the same housing and connecting the plurality of battery cells in series or in parallel is widely used.
Wherein the voltage of the inner series of cells is higher than that of the single cells, and when the voltage reaches above a threshold value, the organic electrolyte is decomposed, resulting in failure of the cells. The interior of the inner string of cells is often separated into a plurality of independent chambers by spacers, each chamber for containing a cell and electrolyte. The provision of the separator occupies a space inside the battery case and affects the energy density of the battery.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the invention provides a battery, which can further increase the energy density of the battery by arranging a foil on a separator and coating active substances so that the separator can generate electrochemical reaction with an electric core.
The invention also provides a charge-discharge module with the battery.
The invention also provides electronic equipment with the charge-discharge module.
A battery according to an embodiment of the first aspect of the present invention includes:
A housing;
At least one spacer disposed in the housing, an edge of the spacer being connected with the housing to divide a plurality of receiving chambers in the housing;
the battery cells are formed by a plurality of pole piece laminates, and each battery cell is respectively positioned in each accommodating cavity;
The battery pack comprises a battery cell, a separator and a pole piece, wherein at least one side of the separator is provided with a first coating part, the first coating part is provided with a first active substance, the pole piece which is arranged at the outermost side of the battery cell and is opposite to the separator is set to be a first pole piece, one side of the first pole piece, which is close to the separator, is provided with a second coating part, the second coating part is provided with a second active substance, and the first active substance and the second active substance can undergo electrochemical reaction.
The battery provided by the embodiment of the invention has at least the following beneficial effects:
According to the multi-cell battery, the isolating pieces are arranged among the cells so as to avoid electrolyte decomposition caused by overhigh voltage, and the active substances are arranged on the isolating pieces and can react with the adjacent pole pieces electrochemically, so that the space on the isolating pieces is fully utilized, and the energy density of the battery is improved.
According to some embodiments of the present invention, the spacer includes an isolation layer and foil layers respectively disposed on two sides of the isolation layer, and the first coating portions are disposed on two opposite sides of the two foil layers;
the second coating parts are arranged on the two first pole pieces which are positioned on two sides of the isolating piece and are opposite to the isolating piece.
According to some embodiments of the present invention, two electrical cores located on two sides of the same separator are respectively configured as a first electrical core and a second electrical core, and a foil layer adjacent to the first electrical core is configured as a first foil layer, and a foil layer adjacent to the second electrical core is configured as a second foil layer;
the cathode lug of the first electric core is electrically connected with the first foil layer, and the cathode lug of the second electric core is electrically connected with the second foil layer;
Or the anode lug of the first electric core is electrically connected with the first foil layer, and the anode lug of the second electric core is electrically connected with the second foil layer.
According to some embodiments of the invention, the spacer further comprises an encapsulation made of insulating material, the encapsulation being located at an edge of the spacer for abutment with the housing;
the isolation piece comprises an isolation layer and foil layers which are respectively arranged on two sides of the isolation layer, the first coating part and the packaging part are arranged on each foil layer, and the packaging part is arranged around the first coating part;
Or the isolating piece comprises an isolating layer and foil layers respectively arranged on two sides of the isolating layer, the first coating parts are arranged on the foil layers, the packaging parts are also arranged on two sides of the isolating layer, and the packaging parts are arranged around the foil layers.
According to some embodiments of the present invention, when the spacer includes an isolation layer and foil layers respectively disposed on two sides of the isolation layer, each foil layer is provided with the first coating portion and the encapsulation portion, and the encapsulation portion is disposed around the first coating portion, an avoidance groove is disposed on the encapsulation portion, and the avoidance groove is used for exposing the foil layer under the encapsulation portion;
One tab of the battery cell penetrates through the avoidance groove and is connected with the foil layer, and the other tab is abutted to the packaging part.
According to some embodiments of the present invention, when the spacer includes an isolation layer and foil layers respectively disposed on two sides of the isolation layer, the first coating portion is disposed on the foil layer, and the packaging portion is disposed on the foil layer and surrounds the first coating portion, an avoidance groove is disposed on the packaging portion, and the avoidance groove is used for exposing the foil layer under the packaging portion;
the battery cell is characterized in that the avoidance groove is filled with a conductive part, one tab of the battery cell is connected with the conductive part, so that the conductive part is electrically connected with the foil layer, and the other tab is abutted to the packaging part.
According to some embodiments of the invention, the projection areas of the first coating portion and the second coating portion overlap along the projection in the thickness direction of the battery.
According to some embodiments of the invention, the battery comprises one separator and two electric cores, wherein a pole piece which is arranged at the outermost side of the electric cores and is opposite to the shell is set to be a second pole piece, the first pole piece is coated on two sides, and the second pole piece is coated on one side.
According to a second aspect of the present invention, a charge-discharge module includes a circuit board and a battery according to any one of the above embodiments, the cells in the battery are electrically connected to the circuit board, respectively, so that each of the cells is connected in series or in parallel.
An electronic device according to an embodiment of a third aspect of the present invention includes the charge-discharge module of any one of the above embodiments.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The invention is further described with reference to the accompanying drawings and examples, in which:
Fig. 1 is a schematic view of a battery structure before packaging according to an embodiment of the present invention;
FIG. 2 is a top view of a battery cell placed on a spacer according to an embodiment of the present invention;
FIG. 3 is a schematic cross-sectional view of the spacer of FIG. 2 taken along the direction A-A;
FIG. 4 is a schematic cross-sectional view of the spacer of FIG. 2 taken along the direction B-B;
FIG. 5 is a schematic cross-sectional view of another embodiment of the spacer of FIG. 2 taken along the direction B-B;
fig. 6 is a top view of a spacer according to an embodiment of the present invention.
Reference numerals:
a housing 100;
A spacer 200; an isolation layer 210; foil layer 220; a first foil layer 221; a second foil layer 222; a first coating part 230; a package 240; the avoidance groove 241; a conductive part 250;
A cell 300; a tab 310; a cathode ear 301; an anode ear 302;
A diaphragm 400.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
In the description of the present invention, it should be understood that references to orientation descriptions such as upper, lower, front, rear, left, right, etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description of the present invention and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.
In the description of the present invention, the meaning of a number is one or more, the meaning of a number is two or more, and greater than, less than, exceeding, etc. are understood to exclude the present number, and the meaning of a number is understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present invention can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.
In the description of the present invention, the descriptions of the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
For some high-power electronic devices, such as unmanned aerial vehicles, notebook computers, cameras and the like, a single battery core cannot meet the power consumption requirement of the high-power electronic devices, and a plurality of batteries are required to be connected in series, in parallel or in series-parallel so as to achieve the output power required by the devices. But series or parallel batteries occupy a larger space and have a lower energy density. For this reason, a scheme of disposing a plurality of battery cells in the same housing and connecting the plurality of battery cells in series or in parallel is widely used.
Wherein the voltage of the inner series of cells is higher than that of the single cells, and when the voltage reaches above a threshold value, the organic electrolyte is decomposed, resulting in failure of the cells. The interior of the inner string of cells is often separated into a plurality of independent chambers by spacers, each chamber for containing a cell and electrolyte. The provision of the separator occupies a space inside the battery case and affects the energy density of the battery.
In view of the above problems, the present application provides a foil and an active material on the separator 200 to allow electrochemical reaction between the separator 200 and the battery cell 300, thereby fully utilizing the surface space of the separator 200, improving the space utilization in the battery, and further increasing the energy density of the battery.
Specifically, the embodiment of the first aspect of the present application proposes a battery comprising a case 100, at least one separator 200, and at least two cells 300. The housing 100 may be made of hard materials such as steel shell and aluminum shell, or soft materials such as aluminum plastic film. In the embodiment shown in fig. 1, two grooves for accommodating the battery cells 300 are punched on the upper side and the lower side of the housing 100, respectively, the first battery cell 300 is placed in the groove of the lower side housing 100, then the spacer 200 is laid on the housing 100, then the second battery cell 300 is placed on the spacer 200, and finally the housing 100 is folded, so that the groove of the upper side housing 100 can be covered on the second battery cell 300, and the housing 100 and the spacer 200 are subjected to edge sealing processes such as hot melting and pressing, so that the housing 100 and the spacer 200 are connected to form an integral structure. The peripheral edges of the spacer 200 are sandwiched by the upper and lower cases 100 and 100, so that the spacer 200 closes the openings of the grooves of the upper and lower cases 100, respectively, to divide the two accommodating chambers in the cases 100.
In other embodiments (not shown), the housing 100 is an aluminum plastic film, and the aluminum plastic film is wrapped with N cells 300 and N-1 spacers 200, where N is a positive integer greater than or equal to 2, and the cells 300 and the spacers 200 are alternately arranged. And then the aluminum-plastic film and the separator 200 are pressed together through hot melting, so that the aluminum-plastic film and the separator 200 form an integral structure, the separator 200 divides a cavity in the aluminum-plastic film into N accommodating cavities, and each accommodating cavity is internally provided with one electric core 300.
It should be noted that, in the embodiment of the present application, the battery cells 300 are all laminated battery cells 300, that is, the battery cells 300 include a plurality of stacked pole pieces, the tabs of the pole pieces are stacked together to form tab portions, the tab portions are welded with the tab 310 of the battery cells 300, and the tab 310 of the battery cells 300 is used for leading out the current of each pole piece. In packaging, referring to fig. 1, the tab 310 of the battery cell 300 is disposed between the spacer 200 and the housing 100 and protrudes out of the housing 100.
For the convenience of subsequent understanding, the pole piece disposed at the outermost side of the battery cell 300 opposite to the first coating portion 230 is set as a first pole piece, the pole piece disposed at the outermost side of the battery cell 300 opposite to the housing 100 is set as a second pole piece, for example, in the embodiment shown in fig. 1, two battery cells 300 are included in the housing 100 (one battery cell 300 is located at the lower side of the separator 200), the two battery cells 300 are respectively located at two sides of the separator 200, and each pole piece is disposed parallel to the separator 200. For a single cell 300, one side of the cell 300 is near the separator 200 and the other side is near the housing 100, i.e., in a dual cell 300 battery as shown in fig. 1, each cell 300 has one first pole piece, one second pole piece, and several other pole pieces between the first pole piece and the second pole piece. It will be appreciated that in the cell structure of the other three or more cells 300, two cells 300 located on opposite sides have one first pole piece, one second pole piece, and a plurality of other pole pieces located between the first pole piece and the second pole piece, and a plurality of cells 300 located on opposite sides have two first pole pieces and a plurality of other pole pieces located between the two first pole pieces.
At least one side of the separator 200 is provided with a first coating portion 230, and the first coating portion 230 is coated with a first active material. A second coating portion is provided on the first pole piece disposed opposite to the side of the separator 200 where the first coating portion 230 is disposed, and the second coating portion is disposed on the side of the first pole piece adjacent to the separator 200 (i.e., the first coating portion 230). The second coating portion is coated with a second active material. The first active material and the second active material are materials with different polarities, and can undergo electrochemical reaction after being immersed in the electrolyte to generate electric energy.
In the battery, a first active material and a second active material are coated on pole pieces of different polarities, for example, if the first active material is graphite or the like, it is often coated on an anode pole piece, and if the second active material is lithium cobaltate, lithium iron phosphate or the like, it is often coated on a cathode pole piece. In the present application, if the first electrode sheet is an anode electrode sheet, the separator 200 is coated with a cathode material, and if the first electrode sheet is a cathode electrode sheet, the separator 200 is coated with an anode material.
It is to be appreciated that in some embodiments, a single side of the separator 200 is provided with the first coating portion 230, so that the separator 200 can electrochemically react with the single-sided battery cell 300, improving the energy density of the battery. In other embodiments, as shown in fig. 3 to 5, both sides of the separator 200 may be provided with the first coating part 230, so that the separator 200 can electrochemically react with the battery cells 300 on both sides, further improving the energy density of the battery.
In the related art multi-cell battery, the separator 200 is often made of an insulating material, or the separator 200 is a multi-layered sandwich structure, at least the outermost layer is an insulating layer, for example, in some prior arts, the separator 200 adopts a PP layer-aluminum layer-PP layer structure for separating the electrolytes in the two receiving chambers. The PP layer of such a structure is not suitable for coating, and thus, the first electrode sheet of the battery cell 300 adjacent to the separator 200 is often a single-sided sheet, that is, the first electrode sheet is coated on one side away from the separator 200 to electrochemically react with its corresponding electrode sheet, and is not coated on the side of the first electrode sheet near the separator 200 to avoid wasting active materials. In the present application, the first pole piece is coated on both sides, and electrochemical reaction can be performed on the adjacent pole piece and the adjacent separator 200.
Based on the above, the separator 200 is disposed between the cells 300 of the multi-cell 300 battery of the present application to avoid the electrolyte decomposition caused by the too high voltage, and the active material is further disposed on the separator 200, which can react with the adjacent pole piece electrochemically, thereby fully utilizing the space on the separator 200 and improving the energy density of the battery.
In some embodiments, as shown in fig. 3 to 5, both sides of the separator 200 are provided with the first coating part 230. Specifically, to achieve the collection and transmission of the electrical energy, the first coating portion 230 needs to be disposed on a metal foil, and if the first active material is a cathode material, the foil is usually an aluminum foil, and if the first active material is a cathode material, the foil is usually a copper foil. Thus, the separator 200 includes an isolation layer 210 and two foil layers 220, wherein the two foil layers 220 are respectively disposed on two sides of the isolation layer 210 and connected to the isolation layer 210, the isolation layer 210 is made of an insulating material, and is not conductive, and a common material is PP (polypropylene) or the like. The first coating portions 230 are disposed on the two foil layers 220, and the two first coating portions 230 are disposed on two sides of the two foil layers 220 facing away from each other, that is, on the side of the foil layers 220 facing away from the isolation layer 210. Correspondingly, the second coating parts are arranged on the first pole pieces of the battery cells 300 at the two sides opposite to the separator 200.
Further, for convenience of the following description, two electric cores 300 on two sides of the same separator 200 are respectively set to be a first electric core and a second electric core, and the foil layer 220 adjacent to the first electric core on the separator 200 is set to be a first foil layer 221, and the foil layer 220 adjacent to the second electric core is set to be a second foil layer 222.
If the first foil layer 221 and the second foil layer 222 have cathode polarity, the cathode tab 301 of the first cell is electrically connected to the first foil layer 221, and the cathode tab 301 of the second cell is electrically connected to the second foil layer 222. It should be noted that, the cathode ear 301 of the first electric core is connected with the current collectors of the cathode pieces, so as to collect the current on each cathode piece for export, after the cathode ear 301 of the first electric core is connected with the first foil layer 221, the current on the first foil layer 221 on the separator 200 and the current on the cathode piece of the first electric core are exported together, and the cathode ear 301 of the second electric core is used for exporting the current on the second foil layer 222 and the current on the cathode piece of the second electric core together after the current is collected. It should be noted that the first foil layer 221 and the second foil layer 222 are not directly connected, and the cathode tab 301 of the first cell and the cathode tab 301 of the second cell may be connected in series by connecting with an external circuit.
In the embodiment shown in fig. 3 to 5, the first foil layer 221 and the second foil layer 222 are each made of aluminum foil, the aluminum foils are connected by the separation layer 210, and the separation layer 210 is a PP material, thereby forming an aluminum layer-PP layer-aluminum layer structure, which can be coated on the outermost aluminum layer.
Conversely, if the first foil layer 221 and the second foil layer 222 have anode polarity, the anode tab 302 of the first cell is electrically connected to the first foil layer 221, and the anode tab 302 of the second cell is electrically connected to the second foil layer 222, so that the anode tab 302 of the first cell is used for guiding current to the first foil layer 221 and the anode sheet of the first cell, and the anode tab 302 of the second cell is the same.
It should be noted that, the electrical connection described herein indicates that the current transmission can be achieved between the foil layer 220 on the spacer 200 and the tab 310 of the battery cell 300, but the specific connection relationship is not limited thereto, for example, the tab 310 of the first battery cell and the first foil layer 221 may be switched by an external wire, a connecting piece, or the like, or the tab 310 of the first battery cell may be directly welded on the foil layer 220 as shown in fig. 1.
In some embodiments, as shown in fig. 2 and 6, it should be explained that fig. 2 is a top view of the battery cell 300 after being placed on the spacer 200, and fig. 6 is a top view of the spacer 200. The spacer 200 further includes a sealing portion 240, where the sealing portion 240 is located at an edge of the spacer 200 and is used to abut against the housing 100. The package part 240 is made of an insulating material, which is not conductive, and a common material thereof is PP (polypropylene) or the like. The encapsulation portion 240 is attached to the edge of the spacer 200, and can prevent the case 100 from being electrified due to direct contact between the case 100 and the foil of the spacer 200, and can be thermally fused to connect with the case 100 during encapsulation.
Further, in some embodiments, the encapsulation portion 240 is disposed on the foil layers 220, as shown in fig. 3 to 6, the first coating portion 230 and the encapsulation portion 240 are disposed on both foil layers 220 of the spacer 200, and the encapsulation portion 240 is disposed around the first coating portion 230. In yet other embodiments (not shown), the encapsulation 240 is disposed on the spacer layer 210, such that the encapsulation 240 is disposed around the foil layer 220.
As shown in fig. 4, the encapsulation portion 240 is further provided with a relief groove 241, and the relief groove 241 is used for exposing the foil layer 220 below the encapsulation portion 240. Therefore, the tab 310 of the same polarity as the foil layer 220 on the battery cell 300 can be inserted into the avoiding groove 241 and connected to the foil layer 220 by welding or other means, so as to electrically connect the tab 310 and the foil layer 220. And, after this electric core 300 is connected into overall structure with the separator 200, can prevent effectively that electric core 300 from rocking in the holding chamber, improved the security performance of battery. In addition, it should be noted that the tab 310 of the opposite polarity of the battery cell 300 and the foil layer 220 is not connected to the foil layer 220, but abuts against the package portion 240 to avoid short circuit.
As specifically described with reference to the embodiment shown in fig. 4, if the first active materials on the separator 200 are all cathode materials and the foil layers 220 are all aluminum foils, the first electrode sheet is a double-sided coated anode sheet, and the first electrode sheet and the separator 200 are separated by the separator 400, and lithium ions are transported through the separator 400. The avoidance groove 241 on the spacer 200 is arranged corresponding to the cathode lug 301 of the first electric core, after the first electric core is attached to the spacer 200, the cathode lug 301 is bent downwards, so that the cathode lug 301 penetrates through the avoidance groove 241 to be abutted against the first foil layer 221, the cathode lug 301 is welded on the first foil layer 221, then the cathode lug 301 is bent upwards to be kept on the same plane with the anode lug 302, the cathode lug 301 continues to extend out of the shell 100, and the second electric core on the other side is also bent upwards.
The anode tab 302 of the first cell and the anode tab 302 of the second cell are not welded with the first foil layer 221, the anode tab 302 penetrates through between the casing 100 and the separator 200 and extends out of the casing 100, and after the casing 100 and the separator 200 are packaged, two sides of the anode tab 302 are respectively abutted against the packaging parts 240 of the casing 100 and the separator 200, and are clamped and fixed between the casing 100 and the separator 200. As shown in fig. 1 and 2, the first and second battery cells are rotationally symmetrically arranged, that is, the tabs 310 of the first and second battery cells are symmetrically arranged along the central axis thereof, so that four tabs 310 extend from the case 100 after the battery is packaged.
In other embodiments, as shown in fig. 2,5 and 6, the encapsulation portion 240 is provided with a relief groove 241. The avoidance groove 241 is provided with a conductive part 250, the lower end of the conductive part 250 is connected with the foil layer 220, and the upper end is flush with the packaging part 240, so that the tab 310 of the battery cell 300 can be electrically connected with the foil layer 220 through the conductive part 250. Taking the connection of the cathode ear 301 and the conductive portion 250 as an example, after the battery cell 300 is placed on the separator 200, the cathode ear 301 and the anode ear 302 of the battery cell 300 are bent downward and then attached to the upper surface of the separator 200 to extend out of the housing 100. At this time, the cathode tab 301 is in contact with the upper surface of the conductive portion 250, so that the welding of the cathode tab 301 and the conductive portion 250 is facilitated, and at this time, the cathode tab 301 and the anode tab 302 are in the same plane, and there is no need to bend the cathode tab 301 again. The anode tab 302 contacts the upper surface of the package portion 240 to avoid shorting the electrical connection of the anode tab 302 to the foil layer 220.
It will be appreciated that the conductive portion 250 may be integrally stamped and formed with the foil layer 220, i.e., the foil thickness at the conductive portion 250 is greater than the foil thickness elsewhere, such that the foil at the conductive portion 250 protrudes from the foil arrangement elsewhere. Alternatively, the conductive portion 250 may be manufactured separately and then connected to the foil layer 220 by welding or the like. The material of the conductive portion 250 may be the same as the material of the foil layer 220, or may be another conductive metal material.
It can be understood that the projection in the thickness direction of the battery, i.e., the projection in the direction perpendicular to the plane of either pole piece, the projection areas of the first coating portion 230 and the second coating portion overlap, i.e., the areas of the first coating portion 230 and the second coating portion are equal and the shapes are uniform, to improve the electrochemical reaction efficiency thereof. In the embodiment of the present application, the surface density, the compacted density, etc. of the first coating portion 230 and the second coating portion remain identical except for the coating size.
Further, in some embodiments, the first battery cell, the second battery cell and the spacer 200 may be laminated together and thermally pressed, so as to ensure that the first battery cell, the second battery cell and the spacer 200 are tightly attached together to form a whole, which not only can improve the energy density of the battery cell, but also can prevent the dislocation of the first battery cell and the second battery cell. In other embodiments, the first and second cells are laminated separately and then hot pressed together with the separator 200. It should be noted that, the present application does not limit the lamination hot-pressing process, and the first battery cell, the second battery cell and the separator 200 can be closely attached together to form a whole.
Based on the aforementioned second electrode sheet, it should be noted that the second electrode sheet is provided with a second coating portion on one side, and the second electrode sheet is often a cathode sheet, and the coating area of the second electrode sheet is disposed on the side of the second electrode sheet away from the housing 100.
An embodiment of the second aspect of the present application proposes a charge-discharge module, which includes a circuit board and a battery according to any one of the above embodiments, wherein the battery cells 300 are respectively electrically connected to the circuit board, for example, four tabs 310 extending as shown in fig. 1 are respectively connected to welding points on the circuit board, wherein two cathode tabs 301 are welded to the same welding point so that the two battery cells 300 are externally connected in series through the circuit board. In still other embodiments, the battery cell 300 and the circuit board are connected in parallel by an external circuit.
An embodiment of a third aspect of the present application provides an electronic device, where the electronic device includes the charge-discharge module set described in the foregoing embodiment, and the electronic device may be an unmanned aerial vehicle, a notebook computer, a camera, or the like, and has high requirements on output power and energy density of a battery.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present invention. Furthermore, embodiments of the invention and features of the embodiments may be combined with each other without conflict.
Claims (10)
1. A battery, comprising:
A housing;
At least one spacer disposed in the housing, an edge of the spacer being connected with the housing to divide a plurality of receiving chambers in the housing;
the battery cells are formed by a plurality of pole piece laminates, and each battery cell is respectively positioned in each accommodating cavity;
The battery pack comprises a battery cell, a separator and a pole piece, wherein at least one side of the separator is provided with a first coating part, the first coating part is provided with a first active substance, the pole piece which is arranged at the outermost side of the battery cell and is opposite to the separator is set to be a first pole piece, one side of the first pole piece, which is close to the separator, is provided with a second coating part, the second coating part is provided with a second active substance, and the first active substance and the second active substance can undergo electrochemical reaction.
2. The battery according to claim 1, wherein the separator comprises an isolation layer and foil layers respectively arranged on two sides of the isolation layer, and the first coating parts are arranged on two opposite sides of the two foil layers;
the second coating parts are arranged on the two first pole pieces which are positioned on two sides of the isolating piece and are opposite to the isolating piece.
3. The battery according to claim 2, wherein two cells located on both sides of the same separator are respectively set as a first cell and a second cell, and a foil layer adjacent to the first cell is set as a first foil layer and a foil layer adjacent to the second cell is set as a second foil layer;
the cathode lug of the first electric core is electrically connected with the first foil layer, and the cathode lug of the second electric core is electrically connected with the second foil layer;
Or the anode lug of the first electric core is electrically connected with the first foil layer, and the anode lug of the second electric core is electrically connected with the second foil layer.
4. The battery of claim 1, wherein the separator further comprises a packaging made of an insulating material, the packaging being located at an edge of the separator for abutting with the case;
the isolation piece comprises an isolation layer and foil layers which are respectively arranged on two sides of the isolation layer, the first coating part and the packaging part are arranged on each foil layer, and the packaging part is arranged around the first coating part;
Or the isolating piece comprises an isolating layer and foil layers respectively arranged on two sides of the isolating layer, the first coating parts are arranged on the foil layers, the packaging parts are also arranged on two sides of the isolating layer, and the packaging parts are arranged around the foil layers.
5. The battery according to claim 4, wherein when the separator includes an isolation layer and foil layers respectively disposed on both sides of the isolation layer, the first coating portion and the encapsulation portion are disposed on each of the foil layers, and the encapsulation portion is disposed around the first coating portion, an escape groove is disposed on the encapsulation portion, and the escape groove is used for exposing the foil layer under the encapsulation portion;
One tab of the battery cell penetrates through the avoidance groove and is connected with the foil layer, and the other tab is abutted to the packaging part.
6. The battery according to claim 4, wherein when the separator includes an isolation layer and foil layers respectively provided on both sides of the isolation layer, the first coating portion is provided on the foil layer, the encapsulation portion is provided on the foil layer and surrounds the first coating portion, and an escape groove is provided on the encapsulation portion, the escape groove being used for exposing the foil layer below the encapsulation portion;
the battery cell is characterized in that the avoidance groove is filled with a conductive part, one tab of the battery cell is connected with the conductive part, so that the conductive part is electrically connected with the foil layer, and the other tab is abutted to the packaging part.
7. The battery according to claim 1, wherein projection areas of the first coating portion and the second coating portion overlap in a thickness direction of the battery.
8. The battery according to claim 1, wherein the battery comprises one separator and two electric cells, and a pole piece which is located at the outermost side of the electric cells and is arranged opposite to the shell is set as a second pole piece, wherein the first pole piece is coated on two sides, and the second pole piece is coated on one side.
9. Charging and discharging module, its characterized in that includes:
A circuit board;
The battery of any one of claims 1 to 8, wherein the cells in the battery are electrically connected to the circuit board, respectively, such that each of the cells is connected in series or in parallel.
10. An electronic device comprising the charge-discharge module of claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410549197.8A CN118380719A (en) | 2024-05-06 | 2024-05-06 | Battery, charge-discharge module and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410549197.8A CN118380719A (en) | 2024-05-06 | 2024-05-06 | Battery, charge-discharge module and electronic equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN118380719A true CN118380719A (en) | 2024-07-23 |
Family
ID=91910184
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410549197.8A Pending CN118380719A (en) | 2024-05-06 | 2024-05-06 | Battery, charge-discharge module and electronic equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN118380719A (en) |
-
2024
- 2024-05-06 CN CN202410549197.8A patent/CN118380719A/en active Pending
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