CN111697170A - Bi-pass single battery, assembling method thereof and battery pack - Google Patents
Bi-pass single battery, assembling method thereof and battery pack Download PDFInfo
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- CN111697170A CN111697170A CN202010579199.3A CN202010579199A CN111697170A CN 111697170 A CN111697170 A CN 111697170A CN 202010579199 A CN202010579199 A CN 202010579199A CN 111697170 A CN111697170 A CN 111697170A
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- battery cell
- fixing portion
- battery
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- 238000003466 welding Methods 0.000 description 7
- 238000002347 injection Methods 0.000 description 5
- 239000007924 injection Substances 0.000 description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 239000011889 copper foil Substances 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
- 239000003792 electrolyte Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
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- 238000007789 sealing Methods 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000004512 die casting Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
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- 230000004048 modification Effects 0.000 description 1
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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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The application discloses a bi-pass single battery, an assembling method thereof and a battery pack, wherein a battery shell comprises a battery core, a first electrode assembly and a second electrode assembly, and the first electrode assembly is electrically connected with one end of the battery core; the second electrode assembly is electrically connected with the opposite end of the battery cell; the casing includes perisporium and end wall, and the perisporium encloses to establish the chamber that holds that forms the bi-pass, and the end wall is connected with the one end of perisporium, and the through-hole has been seted up to the end wall, and during first electrode subassembly, electric core and the whole inserting of second electrode subassembly held the chamber, first electrode subassembly was connected with the end wall and further wears to establish the through-hole, and second electrode subassembly is connected and the cap seal holds the chamber with the perisporium.
Description
Technical Field
The application relates to the technical field of batteries, in particular to a bi-pass single battery, an assembling method thereof and a battery pack.
Background
With the vigorous development of the new energy industry and the further popularization of new energy electric vehicles, the acceptance of people on new energy passenger vehicles is gradually improved. To power electricity core manufacturer, how to further promote the volume space utilization of power electricity core module, in limited lambkin car space, promote the load electric quantity, satisfy long duration requirement to can adopt the system scheme of low-cost high reliability, undoubtedly be the most crucial technical difficulty.
In view of the above, it is desirable to develop a battery pack with high energy density.
Content of application
The application aims to provide a bi-pass single battery, an assembling method thereof and a battery pack to solve the problem of endurance of an electric automobile.
In order to achieve the purpose, the application adopts the following technical scheme: the double-pass single battery comprises a battery cell, a first electrode assembly, a second electrode assembly and a shell, wherein the first electrode assembly is electrically connected with one end of the battery cell; the second electrode assembly is electrically connected with the opposite end of the battery cell; the casing includes perisporium and end wall, and the perisporium encloses to establish the chamber that holds that forms the bi-pass, and the end wall is connected with the one end of perisporium, and the through-hole has been seted up to the end wall, and during first electrode subassembly, electric core and the whole inserting of second electrode subassembly held the chamber, first electrode subassembly was connected with the end wall and further wears to establish the through-hole, and second electrode subassembly is connected and the cap seal holds the chamber with the perisporium.
Furthermore, the first electrode assembly comprises a first end cover, a first connecting sheet and a first pole, the first end cover is connected with the end wall and covers the end wall to form a through hole, the first connecting sheet is electrically connected with one end of the battery core, and the first pole is electrically connected with the first connecting sheet and penetrates through the first end cover.
Further, the through hole is circular, and the first end cover is circular.
Further, electric core is full utmost point ear structure, and first connection piece includes first fixed part, second fixed part and main part, and the relative both ends of main part are provided with first fixed part and second fixed part respectively in order constituting U type structure, first fixed part and second fixed part respectively with electric core electric connection, first utmost point post is worn to establish the main part.
Further, electric core is cross cutting utmost point ear structure, and first connection piece includes first fixed part, second fixed part and main part, and the relative both ends of main part are provided with respectively with the range upon range of first fixed part and the second fixed part that sets up of main part, first fixed part and second fixed part respectively with electric core electric connection, first utmost point post is worn to establish the main part.
Further, the first end cap is provided with a lap joint portion that laps on the inner side face of the end wall.
Further, the medial surface of end wall is provided with the spacing groove, and the overlap joint portion is accomodate in the spacing groove.
Furthermore, the second electrode assembly comprises a second end cover, a second connecting piece and a second pole, the second end cover is connected with the peripheral wall and covers the containing cavity, the second connecting piece is electrically connected with one end, far away from the first electrode assembly, of the battery cell, and the second pole is electrically connected with the second connecting piece and penetrates through the second end cover.
In order to solve the technical problem, the application also provides an assembling method of the bi-pass single battery, which comprises the steps of electrically connecting a first electrode assembly and a second electrode assembly with two opposite ends of a battery cell respectively; providing a shell comprising a peripheral wall and an end wall connected with one end of the peripheral wall, wherein the peripheral wall is surrounded with a double-pass accommodating cavity, and the end wall is provided with a through hole; and integrally inserting the first electrode assembly, the battery core and the second electrode assembly into the accommodating cavity, wherein the first electrode assembly sequentially penetrates through the accommodating cavity and the through hole to be connected with the end wall, and the second electrode assembly is connected with the peripheral wall and covers the accommodating cavity.
In order to solve the technical problem, the present application further provides a battery pack, which includes an outer casing and a plurality of bi-pass unit cells, wherein the plurality of bi-pass unit cells are arranged side by side in the outer casing, and a first electrode assembly and a second electrode assembly of the bi-pass unit cells face the thickness area of the outer casing.
The beneficial effects of the embodiment of the application are as follows: first, the first electrode assembly, the battery core and the second electrode assembly are assembled outside the shell, then the first electrode assembly, the battery core and the second electrode assembly are integrally inserted into the accommodating cavity, the first electrode assembly covers one end of the shell in a sealing mode, and the second electrode assembly covers the opposite end of the shell in a sealing mode to form the double-pass single battery. Because first electrode subassembly and second electrode subassembly link together with the utmost point ear at electric core both ends respectively outside the casing, so can utilize shorter utmost point ear to link together first electrode subassembly and second electrode subassembly respectively with electric core under the prerequisite that does not have the casing to shelter from, avoid too much utmost point ear occupation space, improved casing space utilization.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or earlier developments of the present application, the drawings used in the embodiments or earlier developments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a battery pack provided herein;
FIG. 2 is a schematic diagram of a first state exploded structure of a two-pass cell provided herein;
FIG. 3 is a schematic diagram of a second state exploded structure of a two-pass cell provided herein;
FIG. 4 is a schematic view of an assembly structure of a first electrode assembly provided herein;
FIG. 5 is an exploded view of a first electrode assembly provided herein;
FIG. 6 is a schematic cross-sectional view of a first electrode assembly provided herein;
FIG. 7 is an enlarged, fragmentary, cross-sectional view of area A of FIG. 2 as provided herein;
FIG. 8 is a schematic view of an assembly structure of a second electrode assembly provided herein;
FIG. 9 is an exploded view of a second electrode assembly provided herein;
FIG. 10 is a schematic cross-sectional view of a second electrode assembly provided herein;
FIG. 11 is an exploded schematic view of another embodiment of a two-pass cell provided herein;
fig. 12 is a partially enlarged cross-sectional view of a two-pass cell provided herein, prior to stamping;
fig. 13 is a schematic partial enlarged cross-sectional view of a two-pass cell provided herein after stamping;
fig. 14 is a schematic flow chart of an assembly method of a two-pass cell provided in the present application.
The graphical notation is as follows:
First plastic pad 124, first insulating ring 125, overlapping part 1214, first fixing part 1221
Second fixing part 1223 body part 1225 second electrode assembly 13 second end cap 131
Second connecting piece 132, second pole 133, second plastic pad 134 and second insulating ring 135
Through hole 143 peripheral wall 142 of housing chamber 141 of case 14
Injection hole 145) end wall 144 limiting groove 147 rubber plug 15
Detailed Description
The descriptions in this application referring to "first", "second", etc. are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit indication of the number of technical features indicated.
The description relating to "first", "second", etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicit to the number of technical features indicated.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a battery pack 100 provided in the present application.
The battery pack 100 of the present application is mounted on a chassis of an electric vehicle as an energy storage member. The battery pack 100 includes an outer case 20 and a plurality of double-pass unit cells 10, the plurality of double-pass unit cells 10 being arranged side by side in the outer case 20, the first electrode assembly 12 and the second electrode assembly 13 of the double-pass unit cells 10 facing a thickness region of the outer case 20, i.e., a height region of the ends of the double-pass cells facing the chassis.
Referring to fig. 1 to 3, fig. 2 is a schematic diagram of a first-state exploded structure of a double-pass unit cell 10 provided in the present application, and fig. 3 is a schematic diagram of a second-state exploded structure of the double-pass unit cell 10 provided in the present application. Fig. 2 and 3 are each an exploded structural schematic view of the two-pass unit battery 10, and fig. 3 further separates the first electrode assembly 12 and the second electrode assembly 13 from the battery cell 11, respectively, with respect to fig. 2.
The double-pass single battery 10 comprises a battery cell 11, a first electrode assembly 12, a second electrode assembly 13 and a shell 14, wherein the first electrode assembly 12 is electrically connected with one end of the battery cell 11; the second electrode assembly 13 is electrically connected to an opposite end of the battery cell 11, and the first electrode assembly 12 and the second electrode assembly 13 are positive and negative electrodes respectively for deriving the electric quantity in the battery cell 11; the shell 14 comprises a peripheral wall 142 and an end wall 144, the peripheral wall 142 encloses a double-pass accommodating cavity 141, the end wall 144 is connected with one end of the peripheral wall 142, the end wall 144 is provided with a through hole 143, and the peripheral wall 142 and the end wall 144 can be integrally formed and connected or can be welded and connected; the first electrode assembly 12, the battery cell 11, and the second electrode assembly 13 are assembled outside the case 14, the first electrode assembly 12, the battery cell 11, and the second electrode assembly 13 are integrally inserted into the accommodating cavity 141, the battery cell 11 is accommodated in the accommodating cavity 141, the first electrode assembly 12 is connected to the end wall 144 and further penetrates through the through hole 143 to close the through hole 143, and the second electrode assembly 13 is connected to the peripheral wall 142 and covers the accommodating cavity 141.
In the present embodiment, first, the first electrode assembly 12, the battery cell 11, and the second electrode assembly 13 are assembled outside the case 14, and then the first electrode assembly 12, the battery cell 11, and the second electrode assembly 13 are integrally inserted into the receiving cavity 141, the first electrode assembly 12 covers one end of the case 14, and the second electrode assembly 13 covers the opposite end of the case 14 to form the two-pass unit battery 10. Because the first electrode assembly 12 and the second electrode assembly 13 are respectively connected with the tabs at the two ends of the battery cell 11 outside the casing 14, the first electrode assembly 12 and the second electrode assembly 13 can be respectively connected with the battery cell 11 by using shorter tabs on the premise of no shielding of the casing 14, so that excessive tab occupation space is avoided, and the space utilization rate of the casing 14 is improved.
If the battery cell 11 is first assembled in the accommodating cavity 141 and then the first electrode assembly 12 and the second electrode assembly 13 are connected to the battery cell 11 at both ends of the casing 14, the following disadvantages may occur: 1. the operation difficulty is high, the space is insufficient, and welding and dust removal are difficult; 2. the utilization rate of the height space of the shell 14 is reduced, and the volume energy density is also reduced; 3. the manufacturing cost is high.
In addition, the first electrode assembly 12 and the second electrode assembly 13 are distributed at two ends of the housing 14, so that the double-pass unit cell 10 can be made narrow and long, and the double-pass unit cell 10 is conveniently arranged in the chassis of the electric vehicle in a lying manner, namely, the first electrode assembly 12 and the second electrode assembly 13 face the height part of the chassis, and the double-pass unit cell 10 completely occupies the height space of the chassis, so that the space utilization rate of the height part of the chassis is improved. In addition, after the size of the bi-pass unit cell 10 is increased, the number of unit cells can be reduced, and the occupation of auxiliary materials such as the housing on the chassis space can be reduced.
It should be explained here that, in the field of electric vehicles, the single battery is generally a single-pass battery, that is, the first electrode assembly 12 and the second electrode assembly 13 are respectively disposed at one end of the battery, and in order to accommodate the first electrode assembly 12 and the second electrode assembly 13 at the same time, the end of the single battery is made longer, so that the first electrode assembly 12 and the second electrode assembly 13 are disposed toward the upper end surface of the chassis (if the positive electrode and the negative electrode face the height portion of the chassis, the single battery cannot be disposed), and in order to arrange the leads electrically connected to the first electrode assembly 12 and the second electrode assembly 13, the height space of the chassis is excessively occupied. In fact, because the ride height space is fixed due to electric vehicle manufacturing standards, the increased utilization of the ride height space also increases the energy density of the battery pack 100.
The double-pass single battery 10 further comprises a rubber plug 15, a liquid injection hole 145 for injecting electrolyte into the accommodating cavity 141 is formed in the peripheral wall 142, and the rubber plug 15 is in interference fit with the liquid injection hole 145. At the time of liquid injection, the two-way unit battery 10 is laid down to lower the center of gravity, and the electrolyte is injected into the case 14 from the liquid injection hole 145 in the peripheral wall 142. In addition, the pour hole 145 is provided on the peripheral wall 142 away from the first electrode assembly 12 and the second electrode assembly 13, thereby preventing the first electrode assembly 12 and the second electrode assembly 13 from being contaminated and corroded by the electrolyte overflowing during pouring into the pour hole 145.
Referring to fig. 3 to 7, fig. 4 is an assembly structure diagram of the first electrode assembly 12 provided in the present application, fig. 5 is an exploded structure diagram of the first electrode assembly 12 provided in the present application, fig. 6 is a cross-sectional structure diagram of the first electrode assembly 12 provided in the present application, and fig. 7 is a partially enlarged cross-sectional diagram of a region a in fig. 2 provided in the present application.
The first electrode assembly 12 includes a first end cap 121, a first connection tab 122 and a first terminal post 123, the first end cap 121 is connected to the end wall 144 and covers the through hole 143, the first connection tab 122 is electrically connected to one end of the battery cell 11, and the first terminal post 123 is electrically connected to the first connection tab 122 and penetrates through the first end cap 121 to the outside of the casing 14. The battery cell 11 is electrically connected to the first connecting tab 122, and the first connecting tab 122 is electrically connected to the first pole 123.
It should be explained that, as described in the above embodiment, the first connecting plate 122 is connected to the battery cell 11 outside the casing 14, so that the first connecting plate 122 and the battery cell 11 can be connected together by using a shorter tab without being shielded by the casing 14, thereby avoiding excessive tab occupation space and improving the space utilization rate of the casing 14. The connection mode can be ultrasonic welding and friction welding.
Optionally, the through hole 143 is circular, and correspondingly, the outer contour of the first end cap 121 is also circular. The circular first end cap 121 and the circular through hole 143 are fitted to improve the fault-tolerance.
The first end cap 121 is provided with a bridging portion 1214, the bridging portion 1214 is bridged on the inner side surface of the end wall 144 to limit the first end cap 121, and the first end cap 121 is prevented from passing through the through hole 143 when moving from the accommodating cavity 141 to the through hole 143, so that the positioning effect of the first end cap 121 in the subsequent welding process with the housing 14 is achieved. Further, the end wall 144 defines a limiting groove 147, and the bridging portion 1214 is received in the limiting groove 147.
The first electrode assembly 12 further includes a first plastic pad 124 and a first insulating ring 125. The first plastic pad 124 is disposed between the first end cap 121 and the first connection tab 122 to insulate the first end cap 121 from the first connection tab 122. The first insulating ring 125 is sleeved on the first pole post 123, so that the first pole post 123 is insulated from the first end cap 121.
The length of the first plastic pad 124 is greater than that of the battery cell 11, so that the first plastic pad 124 can prevent the battery cell 11 from scratching the housing 14 and damaging the battery cell 11 during the process of placing the battery cell 11 in the housing 14.
Referring to fig. 3, 8 to 10, fig. 8 is an assembly structure diagram of the second electrode assembly 12 provided in the present application, fig. 9 is an exploded structure diagram of the second electrode assembly 12 provided in the present application, and fig. 10 is a cross-sectional structure diagram of the second electrode assembly 12 provided in the present application.
The second electrode assembly 13 includes a second end cap 131, a second connecting piece 132 and a second pole 133, the second end cap 131 is connected to the peripheral wall 142 and covers the accommodating cavity 141, the second connecting piece 132 is electrically connected to an end of the battery cell 11 away from the first electrode assembly 12, the second pole 133 is electrically connected to the second connecting piece 132 and penetrates through the second end cap 131, and the second pole 133 is used for charging and discharging the battery cell 11.
It should be noted that, as described in the above embodiment, the second connecting piece 132 is connected to the battery cell 11 outside the casing 14, so that the second connecting piece 132 and the battery cell 11 can be connected together by using a shorter tab without being shielded by the casing 14, thereby avoiding excessive tab occupation space and improving the space utilization of the casing 14. The connection mode can be ultrasonic welding and friction welding.
It is noted that in one instance, the first pole 123 is a positive electrode and the second pole 133 is a negative electrode; in another case, first pole post 123 is a negative electrode and second pole post 133 is a positive electrode.
The second electrode assembly 13 further includes a second plastic pad 134 and a second insulating ring 135. The second plastic pad 134 is disposed between the second end cap 131 and the second connection pad 132 to insulate the second end cap 131 from the second connection pad 132. The second insulating ring 135 is disposed on the second pole post 133 to insulate the second pole post 133 from the second end cap 131.
The length of the second plastic pad 134 is greater than that of the battery cell 11, so that the second plastic pad 134 can prevent the battery cell 11 from scratching the housing 14 and damaging the battery cell 11 in the process of placing the battery cell 11 in the housing 14.
Referring to fig. 2, in an embodiment, the battery cell 11 is a full tab structure 112, and the multi-layer copper foil is wound first, and then the end of the winding core is integrally pressed to form the full tab structure serving as a tab. The first connecting piece 122 includes a first fixing portion 1221, a second fixing portion 1223 and a main body portion 1225, two opposite ends of the main body portion 1225 are respectively provided with the first fixing portion 1221 and the second fixing portion 1223 to form a U-shaped structure, the first fixing portion 1221 and the second fixing portion 1223 are respectively electrically connected to the electric core 11, and the main body portion 1225 is penetrated by the first pole 123. Similarly, the second connecting tab 132 may also have the same structure as the first connecting tab 122 for connection with the full tab structure 112.
Referring to fig. 11, in another embodiment, the battery cell 11 is a die-cut tab structure 114. Specifically, referring to fig. 11 to 13, fig. 11 is an exploded structural schematic view of another embodiment of the double-pass unit cell 10 provided in the present application, fig. 12 is a partial enlarged cross-sectional schematic view of the double-pass unit cell 10 provided in the present application before stamping, and fig. 13 is a partial enlarged cross-sectional schematic view of the double-pass unit cell 10 provided in the present application after stamping.
The battery cell 11 is a die-cutting tab structure 114, firstly, the edge of a copper foil is die-cut to form a tab piece, then after a plurality of layers of copper foils are wound, a plurality of tab pieces are overlapped together to form the die-cutting tab structure 114 serving as a tab, and the die-cutting tab structure 114 has the advantages of small area and easy deformation and convenient bending. The first connecting piece 122 includes a first fixing portion 1221, a second fixing portion 1223 and a main body portion 1225, the opposite ends of the main body portion 1225 are respectively provided with a first fixing portion 1221 and a second fixing portion 1223 stacked with the main body portion 1225, the first fixing portion 1221 and the second fixing portion 1223 are respectively electrically connected to the battery cell 11, and the first pole 123 penetrates through the main body portion 1225.
The specific assembling process is as follows: the first fixing portion 1221 and the second fixing portion 1223 are respectively at 90 degrees to the main body portion 1225, the tab is connected to the first fixing portion 1221 and the second fixing portion 1223, and then the first fixing portion 1221 and the second fixing portion 1223 are laterally pushed until the first fixing portion 1221 and the second fixing portion 1223 are respectively stacked on the main body portion 1225, so that the occupancy rate of the tab in space is reduced. Similarly, the second connecting tab 132 may also have the same structure as the first connecting tab 122 for connection with the full tab structure 112.
Referring to fig. 2 and 14, fig. 14 is a flow chart illustrating an assembling method of the two-pass cell 10 according to the present application.
The two-pass unit battery 10 includes a battery cell 11, a first electrode assembly 12, a second electrode assembly 13, and a case 14.
S101: the first electrode assembly 12 and the second electrode assembly 13 are electrically connected to opposite ends of the battery cell 11, respectively.
In one case, the first electrode assembly 12 is a positive electrode, and the second electrode assembly 13 is a negative electrode; in another case, the first electrode assembly 12 is a negative electrode, and the second electrode assembly 13 is a positive electrode, which is not limited herein.
Outside the case 14, the first electrode assembly 12 is first coupled to one end of the cell 11, and then the second electrode assembly 13 is coupled to the opposite end of the cell 11, so that the cell 11, the first electrode assembly 12, and the second electrode assembly 13 are coupled together to form a whole.
S102: a housing 14 is provided which includes a peripheral wall 142 and an end wall 144 connected to one end of the peripheral wall 142, the peripheral wall 142 enclosing a receiving chamber 141 forming a double passage, the end wall 144 being provided with a through hole 143.
The peripheral wall 142 encloses a double-pass accommodating chamber 141, an end wall 144 covers one end of the peripheral wall 142, and the end wall 144 is provided with a through hole 143. The end wall 144 may be integrally formed with the peripheral wall 142, such as by stretch molding, die casting, injection molding, or the like. The end wall 144 may also be welded to the perimeter wall 142. The material of the case 14 may be aluminum, copper, stainless steel, or the like.
S103: the first electrode assembly 12, the battery cell 11, and the second electrode assembly 13 are integrally inserted into the housing cavity 141, the first electrode assembly 12 is connected to the end wall 144 through the housing cavity 141 and the through hole 143 in this order, and the second electrode assembly 13 is connected to the peripheral wall 142 and covers the housing cavity 141.
The first electrode assembly 12 faces the end wall 144, the first electrode assembly 12, the battery cell 11 and the second electrode assembly 13 are integrally inserted into the accommodating cavity 141, the first electrode assembly 12 is connected with the end wall 144 through the accommodating cavity 141 and the through hole 143 in sequence, the connection mode can be welding, and the second electrode assembly 13 is connected with the peripheral wall 142 and covers the accommodating cavity 141.
In the present embodiment, first, the first electrode assembly 12, the battery cell 11, and the second electrode assembly 13 are assembled outside the case 14, and then the first electrode assembly 12, the battery cell 11, and the second electrode assembly 13 are integrally inserted into the receiving cavity 141, the first electrode assembly 12 covers one end of the case 14, and the second electrode assembly 13 covers the opposite end of the case 14 to form the two-pass unit battery 10. Because the first electrode assembly 12 and the second electrode assembly 13 are respectively connected with the tabs at the two ends of the battery cell 11 outside the casing 14, the first electrode assembly 12 and the second electrode assembly 13 can be respectively connected with the battery cell 11 by using shorter tabs on the premise of no shielding of the casing 14, so that excessive tab occupation space is avoided, and the space utilization rate of the casing 14 is improved.
The assembling method of the double-pass single battery 10 of the present application may also be implemented on the basis of the double-pass single battery 10 of any of the above embodiments, which is not described herein in detail.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A bi-pass cell, comprising:
an electric core;
the first electrode assembly is electrically connected with one end of the battery cell;
the second electrode assembly is electrically connected with the opposite end of the battery cell;
the casing, including perisporium and end wall, the perisporium encloses and establishes the chamber that holds that forms the bi-pass, the end wall with the one end of perisporium is connected, the through-hole has been seted up to the end wall, first electrode subassembly the electricity core with second electrode subassembly is whole to be inserted in holding the chamber, first electrode subassembly with the end wall is connected and is further worn to establish the through-hole, second electrode subassembly with the perisporium is connected and the lid seals hold the chamber.
2. Two-pass cell according to claim 1, characterized in that: the first electrode assembly comprises a first end cover, a first connecting sheet and a first pole, the first end cover is connected with the end wall and covers the through hole, the first connecting sheet is electrically connected with one end of the battery cell, and the first pole is electrically connected with the first connecting sheet and penetrates through the first end cover.
3. Two-pass cell according to claim 2, characterized in that: the through hole is circular, and the first end cover is circular.
4. Two-pass cell according to claim 2, characterized in that: the battery cell is of a full-tab structure, the first connecting piece comprises a first fixing portion, a second fixing portion and a main body portion, the first fixing portion and the second fixing portion are arranged at two opposite ends of the main body portion respectively to form a U-shaped structure, the first fixing portion and the second fixing portion are respectively electrically connected with the battery cell, and the main body portion is penetrated by the first pole.
5. Two-pass cell according to claim 2, characterized in that: the battery cell is a die-cutting tab structure, the first connecting piece comprises a first fixing portion, a second fixing portion and a main body portion, the two opposite ends of the main body portion are respectively provided with the first fixing portion and the second fixing portion, which are stacked on the main body portion, the first fixing portion and the second fixing portion are respectively electrically connected with the battery cell, and the main body portion is penetrated by the first pole.
6. Two-pass cell according to claim 2, characterized in that: the first end cap is provided with an overlapping portion that overlaps on the inner side surface of the end wall.
7. Two-pass cell according to claim 6, characterized in that: the inner side surface of the end wall is provided with a limiting groove, and the lap joint part is accommodated in the limiting groove.
8. Two-pass cell according to claim 1, characterized in that: the second electrode assembly comprises a second end cover, a second connecting piece and a second pole column, the second end cover is connected with the peripheral wall and covers the containing cavity, the second connecting piece is electrically connected with one end, far away from the first electrode assembly, of the battery cell, and the second pole column is electrically connected with the second connecting piece and penetrates through the second end cover.
9. A method for assembling a bi-pass single battery is characterized in that: the assembling method comprises the following steps:
electrically connecting the first electrode assembly and the second electrode assembly with two opposite ends of the battery cell respectively;
providing a shell comprising a peripheral wall and an end wall connected with one end of the peripheral wall, wherein the peripheral wall is surrounded with a double-pass accommodating cavity, and the end wall is provided with a through hole;
and integrally inserting the first electrode assembly, the battery cell and the second electrode assembly into the accommodating cavity, wherein the first electrode assembly sequentially penetrates through the accommodating cavity and the through hole to be connected with the end wall, and the second electrode assembly is connected with the peripheral wall and covers the accommodating cavity.
10. A battery pack, comprising: the battery pack comprises an outer casing and a plurality of double-pass unit cells according to any one of claims 1 to 9, wherein the plurality of double-pass unit cells are arranged in the outer casing side by side, and a first electrode assembly and a second electrode assembly of each double-pass unit cell face to the thickness area of the outer casing.
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Address after: 518000 1-2 Floor, Building A, Xinwangda Industrial Park, No. 18 Tangjianan Road, Gongming Street, Guangming New District, Shenzhen City, Guangdong Province Applicant after: Xinwangda Power Technology Co.,Ltd. Address before: 518107 Xinwangda Industrial Park, No.18, Tangjia south, Gongming street, Guangming New District, Shenzhen City, Guangdong Province Applicant before: SUNWODA ELECTRIC VEHICLE BATTERY Co.,Ltd. |
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