CN217881628U

CN217881628U - Cylindrical battery and unit

Info

Publication number: CN217881628U
Application number: CN202222066759.2U
Authority: CN
Inventors: 王盈来; 郭锋; 徐留扣; 李艳红; 蒋勤虚; 方玲; 黄文�; 陈相档; 曹华燕; 温舒婷
Original assignee: Zhejiang Nandu Hongxin Power Technology Co ltd; Zhejiang Narada Power Source Co Ltd; Hangzhou Nandu Power Technology Co Ltd
Current assignee: Zhejiang Nandu Hongxin Power Technology Co ltd; Zhejiang Narada Power Source Co Ltd; Hangzhou Nandu Power Technology Co Ltd
Priority date: 2022-08-03
Filing date: 2022-08-03
Publication date: 2022-11-22
Anticipated expiration: 2032-08-03

Abstract

The application relates to a cylinder battery and unit thereof, the cylinder battery includes the casing and installs the electric core unit module in the casing, electric core unit module includes N looks interconnect's book core, and N is greater than or equal to 2, and the casing includes roof, shell body and bottom plate, electric core unit module installs in the shell body, and roof and bottom plate are used for sealing to the electric core unit module that is located in the shell body. The cylinder battery unit is foretell a plurality of book core series connection or parallelly connected electric core unit module that forms, and this application has the effect that reduces the shell and roll up the weight proportion of core or electric core unit module.

Description

Cylindrical battery and unit

Technical Field

The present application relates to the field of energy storage, and more particularly, to a cylindrical battery and cell.

Background

The cylindrical lithium ion battery has the advantages of high energy density, high average output voltage, small self-discharge, excellent cycle performance, quick charge and discharge, high charging efficiency, high output power, long service life and the like, and occupies more and more market shares in the field of new energy automobiles.

For example, the existing 4680 type non-pole ear battery is made by dry method electrode making, multi-pole ear die cutting and winding. Compared with the prior cylindrical battery, the battery can greatly improve the battery energy.

However, both the 4680 type non-tab battery and the conventional cylindrical battery are generally manufactured into a single cell and then packaged in a casing. From this, every monomer electricity core all installs the casing when arranging, can separate between electric core and the electric core and have the multilayer casing. Therefore, the weight ratio of the shell in the battery cell is higher.

Disclosure of Invention

In order to reduce the weight ratio of the shell to the roll core, the present application provides a cylindrical battery and cell.

In a first aspect, the present application provides a cylindrical battery, which adopts the following technical scheme:

the utility model provides a cylindrical battery, includes the casing and installs the electric core unit module in the casing, electric core unit module includes N looks interconnect's book core, and N is greater than or equal to 2, and the casing includes roof, shell body and bottom plate, electric core unit module installs in the shell body, and roof and bottom plate are used for sealing to the electric core unit module that lies in the shell body.

By adopting the technical scheme, a plurality of interconnected roll cores constitute the electric core unit module, then install electric core unit module to the casing in, through sharing a shell, make the weight proportion of shell in electric core or unit reduce, promote efficiency in groups. Compared with the method that each battery cell is wrapped by the shell and then integrated into a whole, the energy density can be further improved.

Optionally, the bottom plate has a plurality of soldering lugs.

By adopting the technical scheme, when the bottom plate is welded, the bottom of the battery cell and the bottom plate can be welded together through the soldering lug.

Optionally, adjacent winding cores are connected in parallel.

By adopting the technical scheme, each battery can not be over-discharged, the damage of the battery can be reduced, and the service life of the battery is prolonged.

Optionally, the shell is internally provided with a plurality of first mounting grooves corresponding to the winding core, and the shell is in a honeycomb structure due to the plurality of first mounting grooves.

By adopting the technical scheme, each parallel winding core is placed into the first mounting groove for fixation, the shell of the honeycomb structure is taken as the shell of the winding core, and the winding core is not firstly mounted on the shell and then combined into a honeycomb shape, so that the total weight ratio of the battery shell is reduced, and the energy density is improved.

Optionally, adjacent winding cores are connected in series.

By adopting the technical scheme, the winding core can improve the voltage of the cell unit module in a series connection mode, and can drive an electric appliance with larger rated voltage.

Optionally, the shell has a second mounting groove for accommodating a plurality of winding cores therein, and the shell has a cylindrical structure.

Through adopting above-mentioned technical scheme, in installing a plurality of book cores series connection to a second mounting groove, then wrap up the casing again, compare every book core and all install the mode that the shell carries out integrated series connection again, can reduce the account ratio of battery case total weight, improve energy density.

Optionally, the number of the cell unit modules is M, M is greater than or equal to 2, the winding cores of each cell unit module are connected in parallel, and the cell unit modules are connected in series.

Through adopting above-mentioned technical scheme, earlier roll up every in the unit electric core module and roll up core parallel connection, improve the current capacity in the unit electric core module, then establish ties each unit electric core module again, improve whole voltage, can drive the great electrical apparatus of voltage, can prolong the live time again.

Optionally, the number of the shells is the same as the number of the cell unit modules, each cell unit module is wrapped by one of the shells, and the cell unit modules in the shells are connected in series with the cell unit modules in the adjacent shells.

Through adopting above-mentioned technical scheme, every electric core unit module all is provided with the shell, through this kind of mode for every voltage unit module both can integrate and establish ties together, can use exclusive use to the voltage unit module that has the shell again, and convenient and fast satisfies different demands.

Optionally, a cavity is formed in the shell, and M cell unit modules connected in series are installed in the cavity.

By adopting the technical scheme, after each cell unit module is connected in series, the cell unit modules are installed in the cavity of the shell, M cell unit modules are wrapped by one shell, and each cell unit module is set with the shell and then connected in series, so that the weight proportion of the shell in the cell unit modules can be reduced, and the energy density is improved.

In a second aspect, the present application provides a cylindrical battery cell

A cylindrical battery unit comprises a battery cell unit module formed by connecting a plurality of winding cores in series or in parallel.

Through adopting above-mentioned technical scheme, with a plurality of book cores series connection or parallelly connected constitution electricity core unit module, and then can improve the amperage and/or the voltage of electricity core unit module.

In summary, the present application includes at least one of the following beneficial technical effects:

1. by sharing one shell, the weight proportion of the shell in the battery cell or unit is reduced, and the grouping efficiency is improved. The energy density can be further improved;

2. each winding core in the unit cell modules is connected in parallel, so that the current capacity in the unit cell modules is improved, and then the unit cell modules are connected in series, so that the overall voltage is improved, an electric appliance with higher voltage can be driven, and the service life can be prolonged;

3. each battery cell unit module is provided with a shell, and by the mode, each voltage unit module can be integrated together to be connected in series, and can be used independently for the voltage unit module with the shell, so that the battery cell unit module is convenient and quick to use, and different requirements are met;

4. the M battery cell unit modules are wrapped by one shell, so that the weight proportion of the shell in the battery cell unit modules can be reduced, and the energy density is improved.

Drawings

FIG. 1 is an external view of the first embodiment.

Fig. 2 is a schematic overall exploded structure diagram of the first embodiment.

FIG. 3 is a schematic view of the bottom of the housing according to the first embodiment.

Fig. 4 is a structural schematic diagram of a negative current collecting plate.

FIG. 5 is an external view of the second embodiment.

Fig. 6 is an overall explosion diagram of the second embodiment.

FIG. 7 is an external view of the third embodiment.

FIG. 8 is an external view schematically illustrating a fourth embodiment.

Description of the reference numerals: 1. a housing; 11. a top plate; 12. a shell body; 121. a first mounting groove; 122. a second mounting groove; 13. a base plate; 131. soldering lugs; 2. a cell unit module; 21. a winding core; 22. a negative current collecting plate; 23. a positive current collector; 25. a bus bar; 26. leading out the terminal; 27. a top cover pole column; 28. plastic is arranged; 29. and (4) plastic cement coating.

Detailed Description

The present application is described in further detail below with reference to figures 1-8.

The first embodiment is as follows:

referring to fig. 1 and 2, a cylindrical battery comprises a casing 1 and a battery cell unit module 2 installed in the casing 1, wherein the battery cell unit comprises N winding cores 21, N is greater than or equal to 2, and the winding cores 21 are formed by winding a positive plate, a negative plate and a diaphragm. The positive plate, the negative plate and the diaphragm are made of the existing materials, and are not described in detail. The housing 1 includes a top plate 11, a body 12, and a bottom plate 13. Casing 12 and bottom plate 13 integrated into one piece are the aluminum product, and casing 12 intercommunication has a plurality of first mounting grooves 121, and a plurality of first mounting grooves 121 make casing 12 inside be honeycomb structure. The honeycomb structure is made of a PP material, has an insulation effect and can separate each cell unit module 2. An anode current collecting plate 22 and a cathode current collecting plate 23 are respectively disposed at both ends of the first mounting groove 121.

Referring to fig. 3 and 4, each anode current collecting plate 22 is provided with a bus bar 25, the respective bus bars 25 are welded together by a lead-out 26, and the lead-out 26 is laser-welded to the bottom of a cap post 27. The terminals 26 can be connected in parallel, and in order to prevent the negative current collecting plate 22 from contacting the top cover, a lower plastic is injected between the negative current collecting plate 22 and the top plate 11. Similarly, the top plate 11 and the top cap pole 27 are connected with plastic therebetween, so as to prevent the top plate 11 and the top cap pole 27 from directly contacting with each other. The positive current collecting plate 23 is fixed at the bottom of the first mounting groove 121, the bottom is the bottom plate 13, the bottom plate 13 is provided with the concave petal-shaped soldering lug, and the soldering lug is further provided with a soldering seam.

Step of mounting the winding core 21: winding core 21 after winding is mounted in first mounting groove 121, the positive electrode of winding core 21 is brought into contact with positive current collecting plate 23, then, mounting of negative current collecting plate 22 is started, negative current collecting plate 22 is brought into contact with the negative electrode of winding core 21, and then, welding is performed, and one end of bus bar 25 is welded to negative current collecting plate 22, and the other end is welded to top cap post 27. Finally, the current of the negative current collecting plate is connected with the negative electrode inner pole in a laser welding mode. After the assembly is finished, the top plate 11 and the shell body 12 are welded. The cell unit modules 2 are hermetically disposed in the casing 1.

The second embodiment:

referring to fig. 5 and fig. 6, the difference between the embodiment and the embodiment 1 is that the outer part of the shell 12 is cylindrical, the inner part of the shell is provided with a second mounting groove 122, the diameter of the second mounting groove 122 is slightly larger than the diameter of the winding core 21, the winding core 21 can be mounted in the second mounting groove 122, the second mounting groove 122 can accommodate a plurality of winding cores 21, and a plurality of bus bars 25 are arranged in the second mounting groove 122. Adjacent winding cores 21 are connected in series with each other via a bus bar 25, and an anode current collecting plate 22 and a cathode current collecting plate 23 are fixed to both ends of the second mounting groove 122, respectively, so that the anode of one of the winding cores 21 is abutted against the anode current collecting plate 22 and laser-welded thereto, and the anode of the other winding core 21 is abutted against the cathode current collecting plate 23 and laser-welded thereto. Then, top plate 11 and bottom plate 13 are attached to both ends of case 12, and positive current collecting plate 23 and negative current collecting plate 22 are enclosed in case 1. In other embodiments, the housing 12 and the bottom plate 13 may be integrally formed. The cylindrical battery cell has a higher voltage than the first embodiment.

Example three:

referring to fig. 7, the difference between the present embodiment and the first and second embodiments is that the number of the cell unit modules 2 is M, M ≧ 2, each unit module has N winding cores 21 connected in parallel, and N ≧ 2. Firstly, the winding cores 21 which are connected in parallel form a battery cell unit module 2, each battery cell unit module 2 is wrapped by a shell 1, and the battery cell unit modules 2 in different shells 1 are connected together in series.

Example four:

referring to fig. 8, a difference between the present embodiment and the third embodiment is that N winding cores 21 are connected in parallel to form 1 battery cell unit module 2, and after M battery cell unit modules 2 are connected in series, the M battery cell unit modules are installed in one casing 1.

Example five:

a cylindrical battery unit is a battery cell module 2 formed by connecting a plurality of winding cores 21 in series or in parallel in the first embodiment.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited thereto, so: equivalent changes in structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. A cylindrical battery, characterized in that: including casing (1) and install electric core unit module (2) in casing (1), electric core unit module (2) include N looks interconnect's book core (21), and N is greater than or equal to 2, and casing (1) includes roof (11), shell body (12) and bottom plate (13), electric core unit module (2) are installed in shell body (12), and roof (11) and bottom plate (13) are used for sealing to electric core unit module (2) that lie in shell body (12).

2. The cylindrical battery according to claim 1, wherein: the base plate has a plurality of soldering lugs (131).

3. The cylindrical battery according to claim 1 or 2, wherein: the adjacent winding cores (21) are connected in parallel.

4. The cylindrical battery according to claim 3, wherein: the shell (1) is internally provided with a plurality of first mounting grooves (121) corresponding to the winding core (21), and the shell (1) is in a honeycomb structure due to the plurality of first mounting grooves (121).

5. The cylindrical battery according to claim 1, wherein: the adjacent winding cores (21) are connected in series.

6. The cylindrical battery according to claim 5, wherein: the shell (1) is internally provided with a second mounting groove (122) for accommodating a plurality of winding cores (21), and the shell (1) is of a cylindrical structure.

7. The cylindrical battery according to claim 1, wherein: the battery cell unit modules (2) are M in number, M is larger than or equal to 2, the winding cores (21) of the battery cell unit modules (2) are connected in parallel, and the battery cell unit modules (2) are connected in series.

8. The cylindrical battery according to claim 7, wherein: the number that casing (1) set up is the same with the number that electric core unit module (2) set up, and each electric core unit module (2) is wrapped up by one of them casing (1), and electric core unit module (2) in casing (1) is established ties rather than electric core unit module (2) in adjacent casing (1).

9. The cylindrical battery according to claim 7, wherein: a cavity is formed in the shell (1), and M battery cell unit modules (2) which are connected in series are installed in the cavity.

10. A cylindrical battery cell, characterized by: the battery unit is a battery cell unit module (2) formed by connecting a plurality of winding cores (21) in series or in parallel in claim 1.