CN113169401B - Battery, battery module, battery pack, electric vehicle, energy storage device and electric tool - Google Patents
Battery, battery module, battery pack, electric vehicle, energy storage device and electric tool Download PDFInfo
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- CN113169401B CN113169401B CN202080006467.0A CN202080006467A CN113169401B CN 113169401 B CN113169401 B CN 113169401B CN 202080006467 A CN202080006467 A CN 202080006467A CN 113169401 B CN113169401 B CN 113169401B
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- 238000004146 energy storage Methods 0.000 title claims description 6
- 210000004027 cell Anatomy 0.000 claims description 177
- 239000007788 liquid Substances 0.000 claims description 39
- 238000002347 injection Methods 0.000 claims description 35
- 239000007924 injection Substances 0.000 claims description 35
- 125000006850 spacer group Chemical group 0.000 claims description 26
- 230000000712 assembly Effects 0.000 claims description 13
- 238000000429 assembly Methods 0.000 claims description 13
- 210000004460 N cell Anatomy 0.000 claims description 7
- 230000005540 biological transmission Effects 0.000 claims description 6
- 238000005452 bending Methods 0.000 claims description 3
- 239000008358 core component Substances 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 8
- 238000002955 isolation Methods 0.000 description 5
- 238000007789 sealing Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 230000004308 accommodation Effects 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 210000005056 cell body Anatomy 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000005429 filling process Methods 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
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
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
-
- 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
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/258—Modular batteries; Casings provided with means for assembling
-
- 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
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/298—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by the wiring of battery packs
-
- 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
- H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
- H01M50/503—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the shape of the interconnectors
-
- 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
- H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
- H01M50/509—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the type of connection, e.g. mixed connections
- H01M50/512—Connection only in parallel
-
- 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
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The application provides a battery, which comprises a shell and a battery cell assembly arranged in the shell, wherein the battery cell assembly comprises N battery cells, and N is a positive integer greater than or equal to 2; n electric cores in the electric core component are sequentially connected along the length direction of the electric core; in the battery cell assembly, a first electrode lead-out part arranged on the second end face of an n-1 battery cell is connected with a first electrode lead-out part arranged on the first end face of the n-1 battery cell, and a second electrode lead-out part arranged on the second end face of the n-1 battery cell is connected with a second electrode lead-out part arranged on the first end face of the n-1 battery cell, so that the n-1 battery cell and the n-th battery cell are electrically connected in parallel and structurally connected in series. The application also provides electric equipment with the battery.
Description
Technical Field
The application relates to the field of batteries, in particular to a battery, a battery module, a battery pack, an electric vehicle, an energy storage device and an electric tool.
Background
Along with the continuous popularization and expansion of application scenes of new energy products, especially new energy vehicles, the safety of battery packs and the improvement requirement on energy volume density are great, and the increase of the length of single batteries is a method for improving the energy volume density. How to increase the length of the single battery without increasing the total voltage of the single battery is a difficulty facing the industry at present.
Disclosure of Invention
In view of the above, according to an aspect of the present application, a plurality of cells connected in series in a space structure connection manner are provided in a casing of one single cell, so that it is solved how to implement a cell design in which a plurality of cells are connected in parallel and connected in series in a space structure without increasing or greatly increasing the voltage of the single cell, and the energy volume density of the single cell and the cell pack is improved. In addition, the isolating piece is arranged between the adjacent electric cores, and the connecting part of the electrode leading-out parts between the adjacent electric cores is arranged in the groove of the isolating piece, so that the electric cores can be isolated independently, and meanwhile, the connecting strength between the electrode leading-out parts is increased.
In an alternative embodiment, a single battery comprises a shell and a cell assembly arranged in the shell, wherein the cell assembly comprises N cells, and N is a positive integer greater than or equal to 2; n electric cores are sequentially connected along the length direction of the electric core; each electric core comprises a first end face and a second end face, the first end faces and the second end faces are arranged oppositely along the length direction of the electric core, the first end faces and the second end faces are provided with a first electrode leading-out part and a second electrode leading-out part, and the polarities of the first electrode leading-out part and the second electrode leading-out part are opposite; in the battery cell assembly, the first electrode lead-out part arranged on the second end face of the (n-1) th battery cell is connected with the first electrode lead-out part arranged on the first end face of the (n-1) th battery cell, and the second electrode lead-out part arranged on the second end face of the (n-1) th battery cell is connected with the second electrode lead-out part arranged on the first end face of the (n-1) th battery cell. The battery also comprises a separator which is arranged between two adjacent electric cores, a groove is further formed in the separator, and the connecting parts of the two adjacent electrode lead-out parts are arranged in the groove.
In an alternative embodiment, in the single electric core, the first electrode lead-out part of the first end face and the second electrode lead-out part of the second end face are arranged in the same position, and the second electrode lead-out part of the first end face and the first electrode lead-out part of the second end face are arranged in the same position.
Further, in the cell assembly, the arrangement positions of the first electrode lead-out part and the second electrode lead-out part on the first end face of the n-1 th cell are opposite to the arrangement positions of the first electrode lead-out part and the second electrode lead-out part on the first end face of the n-th cell; the arrangement positions of the first electrode lead-out part and the second electrode lead-out part on the second end face of the (n-1) th electric core are opposite to the arrangement positions of the first electrode lead-out part and the second electrode lead-out part on the second end face of the (n-1) th electric core.
In an alternative embodiment, the battery cell comprises a first pole piece, a second pole piece and an isolating film arranged between the first pole piece and the second pole piece, the first pole piece, the isolating film and the second pole piece are wound to form the battery cell, the first electrode leading-out part is connected with the first pole piece, and the second electrode leading-out part is connected with the second pole piece.
Further, the first electrode lead-out member includes a plurality of first electrode units, and the plurality of first electrode units located at the first end face are stacked in a thickness direction of the battery cell to form the first electrode lead-out member of the first end face, and the plurality of first electrode units located at the second end face are stacked in a thickness direction of the battery cell to form the first electrode lead-out member of the second end face.
Further, the plurality of first electrode units and the first pole piece are integrally formed.
In an alternative embodiment, the second electrode lead-out member includes a plurality of second electrode units, and the plurality of second electrode units located at the first end face are stacked in a thickness direction of the electric core to form the second electrode lead-out member of the first end face, and the plurality of second electrode units located at the second end face are stacked in a thickness direction of the electric core to form the second electrode lead-out member of the second end face.
Further, the plurality of second electrode units and the second electrode sheet are integrally formed.
In an alternative embodiment, the spacer has a first side and a second side that are disposed opposite to each other, and along the length direction of the cell, the first side abuts against the second end face of the n-1 th cell, and the second side abuts against the first end face of the n-th cell.
Further, the separator comprises a first separator and a second separator, and the electrode leading-out part between two adjacent electric cores is clamped between the first separator and the second separator.
Further, the groove is formed in one side, facing the second isolation block, of the first isolation block, and the connecting portions of the two adjacent electrode lead-out parts are arranged in the groove.
Further, along the length direction of the battery cell, the width of the groove is smaller than the width of the first isolation block.
In an alternative embodiment, the casing includes a main body portion, a first cover plate and a second cover plate, the battery cell assembly is disposed in the main body portion, the first cover plate and the second cover plate are respectively disposed at two ends of the main body portion, an outer circumference side of the spacer abuts against an inner circumferential surface of the main body portion, the N-1 spacer divides an inner cavity of the main body portion into N independent and sealed accommodating cavities, and each accommodating cavity accommodates one battery cell.
Further, the first cover plate and the second cover plate are respectively provided with a liquid injection port, the first liquid injection port is respectively communicated with the accommodating cavity and the N-th liquid injection port, the separator is provided with a liquid injection channel, the side surface of the main body part is provided with a liquid injection port corresponding to the liquid injection channel, one end of the liquid injection channel is connected with the accommodating cavity at one non-end part, and the other end of the liquid injection channel is connected with the outside through the liquid injection port at the side surface of the main body part.
In an alternative embodiment, the first electrode lead-out part on the first end face of the first cell is connected with the first electrode adapter, the second electrode lead-out part on the second end face of the nth cell is connected with the second electrode adapter, and the first electrode adapter and the second electrode adapter extend out of the shell from the first cover plate and the second cover plate respectively.
In an alternative embodiment, the housing is a cuboid, and has a length L, a width H and a thickness D, wherein the length L is greater than the width H, the width H is greater than the thickness D, and the length L is 300-2400 mm.
Further, the thickness D is greater than or equal to 5mm and less than or equal to 20mm.
In an alternative embodiment, the length L and the width H satisfy: l/h=3 to 20.
In an alternative embodiment, the number of the electric core components is M, M is an integer greater than or equal to 2, and M electric core components are stacked along the thickness direction of the electric core components.
The application provides a battery module, which comprises a circuit board and a battery, wherein the battery is any one of the batteries, and the circuit board is electrically connected with the battery.
The application provides a battery pack, which comprises a package body and a battery, wherein the battery is any one of the batteries, a plurality of batteries are accommodated in the package body, and the batteries are electrically connected in parallel or in series.
An electric vehicle comprises an engine and the battery pack, wherein the engine is electrically connected with the battery pack.
The application also provides an energy storage device comprising an energy converter and the battery in any embodiment, wherein the energy converter is electrically connected with the battery.
The application provides an electric tool, which comprises a transmission assembly, a driver and a battery in any embodiment, wherein the transmission assembly is connected with the driver, and the driver is electrically connected with the battery.
According to the battery provided by the technical scheme, the plurality of electric cores are arranged in the single battery shell, each electric core is provided with at least two electrode leading-out parts with opposite polarities, the plurality of electric cores are connected in series in a space structure, and the plurality of electric cores are connected in parallel through the electrode leading-out parts, so that at least two electric cores in the shell form a structure of serial connection and electric parallel connection of the space structure, the technical problem that electric parallel connection cannot be performed between the plurality of electric cores of which the inner structure of the single battery shell is connected in series is solved, the purpose that the length of the battery is increased, but the total voltage is not increased is achieved under the condition that the total voltage is kept constant, and the plurality of electric cores in the single battery are in a structure of being connected in series in the space structure is achieved. In addition, the isolating piece is arranged between the adjacent electric cores, and the connecting part of the electrode leading-out parts between the adjacent electric cores is arranged in the groove of the isolating piece, so that the electric cores can be isolated independently, and meanwhile, the connecting strength between the electrode leading-out parts is increased.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic perspective view of a battery in an embodiment.
Fig. 2 is a schematic structural view of a cell assembly of the battery of fig. 1.
Fig. 3 is a schematic diagram of the structure of a single cell of the cell assembly of fig. 2.
Fig. 4 is a schematic diagram of a connection structure of a plurality of the cells shown in fig. 3.
Fig. 5 is a schematic diagram of the structure of a single cell in another embodiment.
Fig. 6 is a schematic diagram of a connection structure of a plurality of the cells shown in fig. 5.
Fig. 7 is a schematic perspective view of a single cell in an embodiment.
Fig. 8 is an exploded view of the cell assembly of fig. 2.
Fig. 9 is an exploded view of the battery shown in fig. 1.
Fig. 10 is a schematic perspective view of the cell assembly after being mounted in a housing.
Fig. 11 is a schematic cross-sectional structure of the battery shown in fig. 1.
Fig. 12 is a schematic diagram of a connection structure of a plurality of cells in a cell assembly electrically connected in series.
Fig. 13 is a schematic structural view of a stack of a plurality of cell assemblies.
Fig. 14 is a side view of the stacked structure of fig. 13.
Fig. 15 is a block diagram illustrating a structure of a battery module in an embodiment.
Fig. 16 is a block diagram of a battery pack in an embodiment.
Fig. 17 is a block diagram of an electric vehicle in an embodiment.
Description of main reference numerals:
battery 100
Housing 10
Body 11
First cover plate 12
Second cover plate 13
Accommodation chamber 14
Liquid filling port 15
Cell assembly 20
Cell 21
First end surface 211
Second end face 212
First electrode lead-out member 22
First electrode unit 221
Second electrode lead-out member 23
Second electrode unit 231
First pole piece 24
Second pole piece 25
Separator 26
First electrode adapter 27
Second electrode adapter 28
Spacer 30
First spacer 31
Groove 311
Second spacer 32
First side edge 33
Second side edge 34
Liquid injection passage 35
Adapter 40
Battery module 200
Circuit board 201
Battery pack 300
Package 301
Electric vehicle 400
Engine 401
The specific embodiment is as follows:
the following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments.
It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "or/and" as used herein includes any and all combinations of one or more of the associated listed items.
The application provides a battery, which comprises a shell and a battery cell assembly arranged in the shell, wherein the battery cell assembly comprises N battery cells, and N is a positive integer greater than or equal to 2; the N electric cores are sequentially connected along the length direction of the electric core; each electric core comprises a first end face and a second end face, the first end faces and the second end faces are arranged oppositely along the length direction of the electric core, the first end faces and the second end faces are provided with a first electrode leading-out part and a second electrode leading-out part, and the polarities of the first electrode leading-out part and the second electrode leading-out part are opposite; in the battery cell assembly, the first electrode lead-out part arranged on the second end face of the (n-1) th battery cell is connected with the first electrode lead-out part arranged on the first end face of the (n-1) th battery cell, and the second electrode lead-out part arranged on the second end face of the (n-1) th battery cell is connected with the second electrode lead-out part arranged on the first end face of the (n-1) th battery cell.
According to the battery provided by the technical scheme, the plurality of electric cores are arranged in the single battery shell, each electric core is provided with at least two electrode leading-out parts with opposite polarities, the plurality of electric cores are connected in series in a space structure, and the plurality of electric cores are connected in parallel through the electrode leading-out parts, so that at least two electric cores in the shell form a structure of serial connection and electric parallel connection of the space structure, the technical problem that electric parallel connection cannot be performed between the plurality of electric cores of which the inner structure of the single battery shell is connected in series is solved, the purpose that the length of the battery is increased, but the total voltage is not increased is achieved under the condition that the total voltage is kept constant, and the plurality of electric cores in the single battery are in a structure of being connected in series in the space structure is achieved.
Some embodiments of the application are described in detail. The following embodiments and features of the embodiments may be combined with each other without collision.
Referring to fig. 1 and 2, a battery 100 includes a housing 10 and a cell assembly 20 disposed within the housing 10. The cell assembly 20 includes N cells 21, where N is a positive integer greater than or equal to 2. The N cells 21 are sequentially connected along the first direction to form a spatial series connection. The first direction may be a length direction of the battery cell 21, i.e., a transverse direction of the view of fig. 2. Each of the cells 21 includes a first end surface 211 and a second end surface 212, and the first end surface 211 is disposed opposite to the second end surface 212 along the first direction. In the embodiment of the present application, the first end surface 211 and the second end surface 212 are the two surfaces farthest from each other in the length direction of the cell 21. The first end surface 211 and the second end surface 212 are each provided with a first electrode lead-out member 22 and a second electrode lead-out member 23 for leading out a current, and the polarity of the first electrode lead-out member 22 is opposite to that of the second electrode lead-out member 23. In the cell assembly 20, the first electrode lead-out member 22 provided on the second end face 212 of the n-1 th cell 21 is connected to the first electrode lead-out member 22 provided on the first end face 211 of the n-1 th cell 21, and the second electrode lead-out member 23 provided on the second end face 212 of the n-1 th cell 21 is connected to the second electrode lead-out member 23 provided on the first end face 211 of the n-1 th cell 21 so that the n-1 th cell 21 and the n-th cell 21 are electrically connected in parallel.
Referring to fig. 3, in one embodiment of the present application, in the single cell 21, the first electrode lead-out member 22 of the first end surface 211 and the first electrode lead-out member 22 of the second end surface 212 are disposed at the same position, and the second electrode lead-out member 23 of the first end surface 211 and the second electrode lead-out member 23 of the second end surface 212 are disposed at the same position. The first electrode lead-out member 22 of the first end surface 211 is a positive electrode, the second electrode lead-out member 23 of the first end surface 211 is a negative electrode, the first electrode lead-out member 22 of the second end surface 212 is a positive electrode, and the second electrode lead-out member 23 of the second end surface 212 is a negative electrode.
Referring to fig. 4, when the plurality of electric cells 21 are connected to form the electric cell assembly 20, the plurality of first electrode lead-out members 22 respectively disposed on the end surfaces of the electric cells 21 are disposed at the same positions, and the plurality of second electrode lead-out members 23 respectively disposed on the end surfaces of the electric cells are disposed at the same positions. With the view of fig. 4, the first electrode lead-out members 22 of the plurality of cells 21 are flush with each other and arranged in the upper half of the cell assembly 20, and the second electrode lead-out members 23 of the plurality of cells 21 are flush with each other and arranged in the lower half of the cell assembly 20.
Referring to fig. 5, in another embodiment of the present application, for a single cell 21, the first electrode lead-out member 22 of the first end surface 211 and the second electrode lead-out member 23 of the second end surface 212 are disposed at the same position, and the second electrode lead-out member 23 of the first end surface 211 and the first electrode lead-out member 22 of the second end surface 212 are disposed at the same position. The first electrode lead-out member 22 of the first end surface 211 is a positive electrode, the second electrode lead-out member 23 of the first end surface 211 is a negative electrode, the first electrode lead-out member 22 of the second end surface 212 is a positive electrode, and the second electrode lead-out member 23 of the second end surface 212 is a negative electrode.
Referring to fig. 6, when a plurality of electric cells 21 are connected to form an electric cell assembly 20, the arrangement positions of the first electrode lead-out member 22 and the second electrode lead-out member 23 on the first end surface 211 of the n-1 th electric cell 21 are opposite to the arrangement positions of the first electrode lead-out member and the second electrode lead-out member 23 on the first end surface 211 of the n-th electric cell 21; the arrangement positions of the first electrode lead-out member 22 and the second electrode lead-out member 23 on the second end face 212 of the n-1 th cell 21 are opposite to the arrangement positions of the first electrode lead-out member 22 and the second electrode lead-out member 23 on the second end face 212 of the n-1 th cell 21. In other words, the first electrode lead-out member 22 and the second electrode lead-out member 23 on the adjacent two first end surfaces 211 are disposed at opposite positions, and the first electrode lead-out member 22 and the second electrode lead-out member 23 on the adjacent two second end surfaces 212 are disposed at opposite positions. In the embodiment of the present application, N cells 21 are identical, and when the cells 21 shown in fig. 5 are used to connect into the cell assembly 20, the cells connected after the first cell 21 need to be properly turned 180 ° to meet the parallel requirement, the N-th cell and the n+1th cell are arranged in opposite directions, and the N-th cell and the n+2th cell are arranged in the same direction. In other embodiments, the N cells 21 may be different, specifically, the nth cell and the n+2th cell are the same, and the nth cell and the n+1th cell are different. In other words, the odd-numbered cells are the same type of cells and the even-numbered cells are another type of cells.
Referring to fig. 7, the battery cell 21 includes a first pole piece 24, a second pole piece 25, and a separation film 26 disposed between the first pole piece 24 and the second pole piece 25, wherein the polarities of the first pole piece 24 and the second pole piece 25 are opposite, and the first pole piece 24, the separation film 26, and the second pole piece 25 are wound to form the battery cell 21. The first electrode lead-out member 22 is connected to the first electrode tab 24 and has the same polarity as the first electrode tab 24, and the second electrode lead-out member 23 is connected to the second electrode tab 25 and has the same polarity as the second electrode tab 25.
In one embodiment of the present application, the first electrode drawing member 22 includes a plurality of first electrode units 221, and the second electrode drawing member 23 includes a plurality of second electrode units 231. In the second direction, the plurality of first electrode units 221 located at the first end face 211 are stacked to form the first electrode lead-out member 22 of the first end face 211, the plurality of first electrode units 221 located at the second end face 212 are stacked to form the first electrode lead-out member of the second end face 212, the plurality of second electrode units 231 located at the first end face 211 are stacked to form the second electrode lead-out member 23 of the first end face 211, and the plurality of second electrode units 231 located at the second end face 212 are stacked to form the second electrode lead-out member 23 of the second end face 212. The second direction may be a thickness direction of the battery cell 21, and the first direction and the second direction are perpendicular to each other.
The plurality of first electrode units 221 are integrally formed with the first electrode sheet 24, and in particular, the plurality of first electrode units 221 are formed by cutting a raw material of a current collector of the first electrode sheet 24. The plurality of second electrode units 231 are integrally formed with the second electrode sheet 25, and in particular, the plurality of second electrode units 231 are formed by cutting a raw material of a current collector of the second electrode sheet 25.
It will be appreciated that in other embodiments, the battery cell 21 is a laminated battery cell, and is formed by laminating a plurality of first pole pieces 24, a plurality of second pole pieces 25, and a separator 26.
Referring to fig. 1, 8 and 9, the battery 100 further includes a separator 30, and one separator 30 is disposed between two adjacent cells 21. The spacer 30 has a first side 33 and a second side 34 disposed opposite to each other, and along the first direction, the first side 33 abuts against the second end face 212 of the n-1 th cell 21, and the second side 34 abuts against the first end face 211 of the n-1 th cell 21. The separator 30 includes a first separator 31 and a second separator 32, and an electrode lead-out member between two adjacent cells 21 is sandwiched between the first separator 31 and the second separator 32. The spacers 30 serve to space the individual unit cells 21 while increasing the connection strength between the electrode lead-out members. A groove 311 is formed in a surface of the first isolation block 31 facing the second isolation block 32, and a connection portion of two adjacent electrode lead-out members is disposed in the groove 311. When the second spacer 32 is engaged with the first spacer 31, the connection portions of the adjacent two electrode lead-out members are sealed in the spacers. The width of the groove 311 is smaller than the width of the first spacer 31 along the first direction, which is beneficial to improving the sealing performance of the spacer 30. In the embodiment of the application, the number of the grooves 311 is the same as the number of the electrode lead-out parts on each end surface, so that the connection part of each electrode lead-out part can be sealed independently, and the possibility of liquid leakage is reduced.
The housing 10 is generally rectangular and has a length L, a width H, and a thickness D, the length L being greater than the width H and the width H being greater than the thickness D. The length L is 400-2500 mm, the thickness D is more than 10mm, and the dimensional relation between the length L and the width H satisfies the formula: l/h=3 to 20.
The housing 10 includes a main body 11, a first cover 12 and a second cover 13, the main body 11 is a rectangular housing with two open ends, the battery cell assembly 20 is inserted into the main body 11 in the arrow direction shown in fig. 9, and the first cover 12 and the second cover 13 are respectively disposed at two ends of the main body 11 to seal the battery cell assembly 20 in the main body 11. With continued reference to fig. 10, after the battery cell assembly 20 is assembled into the housing 10, the outer peripheral side of the spacer 30 abuts against the inner peripheral surface of the main body 11, and the N-1 spacers 30 divide the inner cavity of the main body 11 into N independent and sealed accommodating cavities 14, and each accommodating cavity 14 accommodates one single battery cell 21 therein. Along the length direction of the battery 100, the first cell 21 is accommodated in the first accommodating chamber 14, and the first electrode lead-out member 22 on the first end surface 211 of the first cell 21 protrudes out of the case 10; the nth cell 21 is accommodated in the nth accommodation chamber 14, and the second electrode extraction member 23 on the second end face 212 of the nth cell 21 protrudes from the case 10. Further, the first electrode lead-out member 22 on the first end surface 211 of the first cell 21 is connected to the first electrode adapter 27, the second electrode lead-out member 23 on the second end surface 212 of the nth cell 21 is connected to the second electrode adapter 28, and the first electrode adapter 27 and the second electrode adapter 28 respectively extend out of the housing 10 from the first cover plate 12 and the second cover plate 13.
It will be appreciated that in other embodiments of the present application, the first electrode lead-out member 22 and the second electrode lead-out member 23 on the first end surface 211 of the first cell 21, and the first electrode lead-out member 22 and the second electrode lead-out member 23 on the second end surface 212 of the nth cell 21 may extend out of the housing 10 at the same time, so as to simplify the parallel circuit structure between the plurality of batteries 100, and complete the parallel and spatial serial connection of the plurality of batteries 100 without additional connection leads or patch cords.
The first cover plate 12 and the second cover plate 13 are respectively provided with a liquid injection port 15, the first accommodating cavity 14 and the Nth accommodating cavity 14 are respectively communicated, and electrolyte is filled into the first accommodating cavity 14 and the Nth accommodating cavity 14 from the liquid injection ports 15. With continued reference to fig. 11, the spacer 30 is provided with a liquid injection channel 35, the sidewall of the main body 11 is provided with a liquid injection port corresponding to the liquid injection channel 35, one end of the liquid injection channel 35 is connected with a non-end containing cavity 14, and the other end of the liquid injection channel is connected with the outside through the liquid injection port of the main body 11, so as to facilitate the injection of electrolyte into the containing cavity 14 located in the middle area. After the filling process is completed, the filling port 15 and the filling channel 35 are filled with sealing plugs, so as to complete the sealing of the housing 10. In the embodiment of the present application, the liquid injection channel 35 is substantially linear and is opened obliquely downward from the end of the separator 30, so that the liquid injection channel 35 communicates with the accommodating cavity 14 from the side of the separator 30. In other words, one end of the liquid injection passage 35 is opened from the end of the separator 30, and the other end of the liquid injection passage 35 is opened from the side of the separator 30. In other alternative embodiments, the liquid injection channel 35 may have other shapes, such as an "L" shape, an "S" shape, a "T" shape, etc., which is not limited thereto.
Referring to fig. 12, in another embodiment of the present application, the plurality of electric cells 21 in the electric cell assembly 20 may be electrically connected in series, the first electrode lead-out member 22 disposed on the second end surface 212 of the n-1 th electric cell 21 is connected with the second electrode lead-out member 23 disposed on the first end surface 211 of the n-1 th electric cell 21, and the second electrode lead-out member 23 disposed on the second end surface 212 of the n-1 th electric cell 21 is connected with the first electrode lead-out member 22 disposed on the first end surface 211 of the n-1 th electric cell 21, so that the n-1 th electric cell 21 and the n-th electric cell 21 are electrically connected in series and structurally connected in series.
Referring to fig. 13 and 14, in other embodiments of the present application, the number of the battery modules 20 is M, where M is an integer greater than or equal to 2. Along the thickness direction of the cell assemblies 20, M cell assemblies 20 are stacked to form one cell body, which may be contained in the case 10 or in a packaging bag to make a soft pack battery. The M cell assemblies 20 arranged in a stacked manner are electrically connected in parallel or in series. The two electrode lead-out members to be joined may be connected by an adapter 40, the adapter 40 being substantially perpendicular to the first electrode lead-out member 22 or the second electrode lead-out member 23. In other alternative embodiments, the connection between two adjacent cell assemblies 20 may be achieved by bending the ends of the electrode lead members and then joining the bent portions of the two electrode lead members.
Specifically, along the length direction of the battery cell assembly 20, the battery cell assembly 20 includes a first end and a second end that are disposed opposite to each other, and in the embodiment of the present application, the first end and the second end are two ends that are farthest from each other in the length direction of the battery cell assembly 20. The first electrode lead-out part 22 at the second end of the M-1-th cell assembly 20 is connected with the first electrode lead-out part 22 at the first end of the M-th cell assembly 20, and the second electrode lead-out part 23 at the second end of the M-1-th cell assembly 20 is connected with the second electrode lead-out part 23 at the first end of the M-th cell assembly 20, so that the M cell assemblies 20 are electrically connected in parallel. In another embodiment, the first electrode lead-out member 22 at the second end of the M-1 th cell assembly 20 is connected to the second electrode lead-out member 23 at the first end of the M-1 th cell assembly 20, and the second electrode lead-out member 23 at the second end of the M-1 th cell assembly 20 is connected to the first electrode lead-out member 22 at the first end of the M-th cell assembly 20, so as to realize the electrical series connection of the M cell assemblies 20.
Referring to fig. 15, the present application provides a battery module 200, which includes a circuit board 201 and the battery 100 in any one of the embodiments or the combination of the embodiments, wherein the circuit board 201 is electrically connected to the battery 100.
Referring to fig. 16, the present application provides a battery pack 300, which includes a package 301 and a plurality of batteries 100, wherein the batteries 100 are the batteries 100 in any one of the embodiments or the combination of the embodiments, the plurality of batteries 100 are accommodated in the package 301, and the plurality of batteries 100 are electrically connected in parallel or in series.
Referring to fig. 17, the present application further provides an electric vehicle 400, which includes an engine 401 and the battery pack 300 in the above embodiment, wherein the battery pack 300 is electrically connected to the engine 401 to provide electric energy to the engine 401.
In an alternative embodiment, the instant application further provides an energy storage device comprising an energy converter electrically connected to the battery 100 of any one or combination of the embodiments described above.
In another embodiment, the present application provides a power tool comprising a transmission assembly, a driver, and a battery 100 in any one or combination of the above embodiments, the transmission assembly being connected to the driver, the driver being electrically connected to the battery.
The above embodiments are only for illustrating the technical solution of the present application and not for limiting the same, and although the present application has been described in detail with reference to the above preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present application.
Claims (14)
1. A battery, comprising:
a housing; and
the battery cell assembly is arranged in the shell;
the battery cell assembly is characterized by comprising N battery cells, wherein N is a positive integer greater than or equal to 2;
n electric cores are sequentially connected along the length direction of the electric core;
each electric core comprises a first end face and a second end face, the first end face and the second end face are arranged opposite to each other along the length direction of the electric core, the first end face and the second end face are respectively provided with a first electrode lead-out part and a second electrode lead-out part, the polarities of the first electrode lead-out parts and the second electrode lead-out parts are opposite, the arrangement position of the first electrode lead-out parts of the second end face of an n-1 electric core is the same as the arrangement position of the first electrode lead-out parts arranged on the first end face of an n-1 electric core, and the arrangement position of the second electrode lead-out parts arranged on the second end face of the n-1 electric core is the same as the arrangement position of the second electrode lead-out parts arranged on the first end face of the n-1 electric core;
in the battery cell assembly, the first electrode lead-out part arranged on the second end face of the (n-1) th battery cell is connected with the first electrode lead-out part arranged on the first end face of the (n-1) th battery cell, and the second electrode lead-out part arranged on the second end face of the (n-1) th battery cell is connected with the second electrode lead-out part arranged on the first end face of the (n-1) th battery cell;
the battery also comprises a spacer, wherein the spacer is provided with a first side and a second side which are oppositely arranged, the first side is abutted against the second end face of the n-1 th battery cell along the length direction of the battery cell, the second side is abutted against the first end face of the n-1 th battery cell, the spacer comprises a first spacer block and a second spacer block, an electrode leading-out part between two adjacent battery cells is clamped between the first spacer block and the second spacer block, a groove is formed in one side of the first spacer block, which faces the second spacer block, along the length direction of the battery cell, the width of the groove is smaller than that of the first spacer block, and the connecting parts of the two adjacent electrode leading-out parts are arranged in the groove.
2. The battery of claim 1, wherein in the cell assembly, the first electrode lead-out member and the second electrode lead-out member on the first end face of the n-1 th cell are disposed at opposite positions from the first electrode lead-out member and the second electrode lead-out member on the first end face of the n-th cell; the arrangement positions of the first electrode lead-out part and the second electrode lead-out part on the second end face of the (n-1) th electric core are opposite to the arrangement positions of the first electrode lead-out part and the second electrode lead-out part on the second end face of the (n-1) th electric core.
3. The battery of claim 1, wherein in each of the cells, the first electrode lead-out member of the first end face is disposed at the same position as the second electrode lead-out member of the second end face, and the second electrode lead-out member of the first end face is disposed at the same position as the first electrode lead-out member of the second end face.
4. The battery of claim 1, wherein the N cells are identical cells, the N-th cell is disposed in a direction opposite to the n+1-th cell, and the N-th cell is disposed in a direction identical to the n+2-th cell.
5. The battery of claim 1, wherein the N cells are different cells, the nth cell being different from the n+1th cell, the nth cell being the same as the n+2th cell.
6. The battery of claim 1, wherein the housing comprises a main body portion, a first cover plate and a second cover plate, the cell assembly is disposed in the main body portion, and the first cover plate and the second cover plate are disposed at two ends of the main body portion, respectively; the outer circumference side of the isolating piece is abutted against the inner circumferential surface of the main body part, N-1 isolating pieces divide the inner cavity of the main body part into N mutually independent and sealed accommodating cavities, and each accommodating cavity accommodates one battery cell.
7. The battery of claim 6, wherein the first cover plate and the second cover plate are respectively provided with a liquid injection port which is respectively communicated with the first accommodating cavity and the Nth accommodating cavity; the liquid injection device comprises a main body part, a liquid injection port, a liquid storage cavity, a liquid injection channel, a liquid storage cavity and a liquid injection port, wherein the liquid injection channel is formed in the isolating piece, the liquid injection port corresponding to the liquid injection channel is formed in the side face of the main body part, one end of the liquid injection channel is connected with the liquid storage cavity, and the other end of the liquid injection channel is connected with the outside through the liquid injection port in the side face of the main body part.
8. The battery of claim 1, wherein the number of the cell assemblies is M, M is an integer greater than or equal to 2, and M of the cell assemblies are stacked in a thickness direction of the cell assemblies and electrically connected in series.
9. The battery of claim 8, wherein the electrode lead-out members of M said cell assemblies are connected by an adapter; or M cell assemblies are connected with two adjacent cell assemblies by bending the electrode leading-out part and combining the bending parts.
10. A battery module comprising a circuit board and a battery, wherein the battery is the battery of any one of claims 1-9, and the circuit board is electrically connected to the battery.
11. A battery pack comprising a package body and a battery, wherein the battery is the battery according to any one of claims 1 to 9, and a plurality of the batteries are accommodated in the package body.
12. An electric vehicle comprising an engine and a battery pack, wherein the battery pack is the battery pack of claim 11, and wherein the battery pack is electrically connected.
13. An energy storage device comprising an energy converter and a battery, wherein the battery is a battery as claimed in any one of claims 1 to 9, the energy converter being electrically connected to the battery.
14. A power tool comprising a transmission assembly, a driver and a battery, wherein the battery is a battery as claimed in any one of claims 1 to 9, the transmission assembly being connected to the driver, the driver being electrically connected to the battery.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2020/077505 WO2021174403A1 (en) | 2020-03-02 | 2020-03-02 | Battery, battery module, battery pack, electric vehicle, energy storage apparatus, and electric-powered tool |
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| Publication Number | Publication Date |
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| CN113169401A CN113169401A (en) | 2021-07-23 |
| CN113169401B true CN113169401B (en) | 2023-11-21 |
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| WO (1) | WO2021174403A1 (en) |
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| CN116706441A (en) * | 2022-02-25 | 2023-09-05 | 宁德时代新能源科技股份有限公司 | Battery monomer, battery and electric equipment |
| WO2023173428A1 (en) * | 2022-03-18 | 2023-09-21 | 宁德时代新能源科技股份有限公司 | Battery cell and manufacturing method and manufacturing apparatus therefor, battery, and power consuming apparatus |
| CN114639904B (en) * | 2022-03-31 | 2024-03-15 | 东莞新能德科技有限公司 | Battery cell, battery and electronic equipment |
| CN115882114B (en) * | 2023-02-10 | 2023-07-14 | 比亚迪股份有限公司 | Battery module, battery pack and automobile |
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| CN113169401A (en) | 2021-07-23 |
| WO2021174403A1 (en) | 2021-09-10 |
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