CN114649651A - Battery welded without electrode lug and preparation method - Google Patents
Battery welded without electrode lug and preparation method Download PDFInfo
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- CN114649651A CN114649651A CN202210211682.5A CN202210211682A CN114649651A CN 114649651 A CN114649651 A CN 114649651A CN 202210211682 A CN202210211682 A CN 202210211682A CN 114649651 A CN114649651 A CN 114649651A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
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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
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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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
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
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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 invention discloses a battery welded without electrode lugs, which relates to the field of laminated lithium ion batteries and comprises a negative electrode shell provided with an accommodating groove, and a battery stack core arranged in the accommodating groove, wherein the battery stack core consists of a positive plate, a negative plate and a diaphragm; the invention also provides a preparation method of the battery without the electrode lugs, which solves the technical problems that in the prior art, the welding is carried out inside the battery without the electrode lugs, the materials of the electrode lugs of the positive electrode and the negative electrode are saved, and the space utilization rate of the battery is improved.
Description
Technical Field
The invention relates to the technical field of laminated lithium ion batteries, in particular to a battery welded without electrode lugs and a preparation method thereof.
Background
With the rapid increase of the demand of the current market for batteries, the requirements for batteries are higher and higher, and various large battery manufacturers at home and abroad are continuously meeting the market demands, so that the batteries are designed and modified from the aspects of improving the energy density of the batteries, reducing the cost of the batteries, improving the large-current charging and discharging capacity of the batteries and the like.
When the traditional laminated lithium ion battery is manufactured, the battery adopts a structure with a pole lug. Positive and negative pole pieces in the battery are respectively connected into a pole lug group, then one end of a pole lug connecting piece is welded with the pole lug group, and the other end of the pole lug connecting piece is connected to the shell. The tab group of the positive plate on the laminated lithium ion battery and the positive conductive shell are welded, and the tab group of the negative plate and the negative conductive shell are welded in an internal welding connection mode, so that the materials of the positive and negative tabs can be greatly saved, but the internal welding of the battery is difficult due to the absence of the tabs.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a non-polar lug welded battery, which solves the technical problems that the welding is carried out inside the non-polar lug battery in the prior art, the anode and cathode lug materials are saved, and the space utilization rate of the battery is improved.
In order to achieve the purpose, the invention provides a battery welded without electrode lugs, which comprises a negative electrode shell provided with an accommodating groove, a battery stack core arranged in the accommodating groove, a positive electrode cover plate arranged at the top of the negative electrode shell, a positive electrode terminal arranged in the accommodating groove and insulated from the positive electrode cover plate and the negative electrode shell, and a liquid injection hole arranged on the positive electrode cover plate, wherein the battery stack core consists of a positive electrode plate, a negative electrode plate and a diaphragm; the positive pole pieces are connected to form a positive pole lug group and a plurality of negative pole pieces are connected to form a negative pole lug group, the positive pole lug group is welded and fixed with the positive pole terminal, and the negative pole lug group is welded and fixed with the negative pole shell.
When using this technical scheme, all positive plates welding obtain anodal utmost point ear crowd, and all negative pole piece welding obtain negative pole utmost point ear crowd, then anodal utmost point ear crowd spot welds to the positive terminal on, and the core was folded to the battery negative pole utmost point ear crowd welds with negative pole casing, folds the core with the battery again and positive terminal places in the holding tank, then covers at the holding tank top with the positive plate, the positive terminal sets up the top of folding the core at the battery, anodal utmost point ear crowd is located the top of one side in the holding tank with the welding point of positive terminal, negative pole utmost point ear crowd is located the bottom of opposite side in the holding tank with the welding point of negative pole casing, annotate the liquid hole and be located the top of the welding point of negative pole utmost point ear crowd and negative pole casing, annotate the welded connection of the position in liquid hole in the utmost point ear crowd and the negative pole casing of being convenient for.
In the above technical scheme, an insulating pad is arranged between the positive terminal and the positive cover plate.
In the above technical solution, the positive terminal is provided with a conductive portion, the positive cover plate is provided with a through hole, and the conductive portion protrudes from the through hole.
Among the above-mentioned technical scheme, the core is folded to the battery is by one deck negative pole piece and the range upon range of formation in proper order of one deck positive plate, every layer all be provided with the diaphragm between positive plate and the negative pole piece, the battery is folded the bottommost of core and is the negative pole piece, and the topmost is positive plate, and the installation of core and negative pole casing, positive terminal and anodal apron is folded to the battery of being convenient for.
The embodiment also provides a preparation method of the battery welded without the electrode lug, which is characterized by comprising the following steps:
(a) the negative plate, the diaphragm and the positive plate are sequentially stacked to form a battery stack core;
(b) connecting all positive plates on the battery stack core to form a positive electrode tab group, connecting all negative plates to form a negative electrode tab group, and respectively arranging the positive electrode tab group and the negative electrode tab group on two sides of the battery stack core;
(c) welding and fixing the positive pole lug group and the positive pole terminal, placing the battery stack core and the positive pole terminal into a negative pole shell, and directly contacting a negative pole piece at the bottom of the battery stack core with the negative pole shell;
(d) a positive cover plate is arranged at the top of the negative shell, and an insulating pad is arranged between the positive cover plate and the positive terminal;
(e) a welding needle penetrates through the liquid injection hole to fixedly weld the negative pole tab group and the negative pole shell;
(f) (ii) a And injecting electrolyte into the injection hole, and sealing the injection hole by using a sealing piece.
Compared with the prior art, the invention has the beneficial effects that:
when the technical scheme is used, all positive plates and all negative plates on the battery stack core are respectively welded to obtain a positive electrode lug group and a negative electrode lug group, then the positive electrode lug group is spot-welded to a positive electrode terminal, the negative electrode lug group of the battery stack core is welded with a negative electrode shell, the liquid injection hole of the technical scheme is positioned right above the welding point of the negative electrode lug group and the negative electrode shell, after the negative electrode shell and a positive electrode cover plate are installed, a welding needle can penetrate through the liquid injection hole to weld the negative electrode lug group and the negative electrode shell inside the battery, moreover, the welding point of the positive electrode lug group and the positive electrode terminal and the welding point of the negative electrode lug group and the negative electrode shell are respectively arranged on the top of one side of the battery and on the bottom of one side of the battery, thus being convenient to process and install, solving the internal welding problem of the battery without the positive electrode lug and the negative electrode lugs, saving the lug materials, the space utilization rate of the battery is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a no-lug welded battery provided by the present invention;
fig. 2 is a schematic view of a non-tab welded battery provided by the invention with the positive terminal and the insulating pad removed.
The reference numbers of the figures are: 1. a battery stack core; 11. a positive plate; 111. a positive electrode tab group; 12. a negative plate; 121. a negative electrode tab group; 13. a diaphragm; 2. a negative electrode case; 21. accommodating a tank; 3. a positive terminal; 31. a conductive portion; 5. welding pins; 6. a positive electrode cover plate; 61. a liquid injection hole; 62. a through hole; 7. an insulating pad.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
As shown in fig. 1-2, the present embodiment provides a tab-less welded battery, which includes a battery stack core 1, a negative electrode case 2, a positive electrode terminal 3, and a positive electrode cover plate 6.
The negative electrode case 2 is provided with a housing groove 21. The battery stack core 1 is composed of a positive electrode sheet 11, a negative electrode sheet 12, and a separator 13, and the battery stack core 1 is disposed in the accommodation groove 21. The bottom layer of the battery stack core 1 is the negative plate 12, so that the bottom of the battery stack core 1 is placed in the negative casing 2 and directly contacts the negative casing 2. The top of the cell stack 1 is the positive electrode tab 11, and then the positive electrode terminal 3 is placed on top of the cell stack 1. In the battery stack core 1 of the present embodiment, a plurality of positive plates 11 are connected to form a positive electrode tab group 111, and a plurality of negative plates 12 are connected to form a negative electrode tab group 121. The positive electrode tab group 111 is welded and fixed to the positive electrode terminal 3 so that the plurality of positive electrode tabs 11 are connected to the positive electrode terminal 3, and the negative electrode tab group 121 is welded and fixed to the negative electrode case 2 so that the plurality of negative electrode tabs 12 are connected to the negative electrode case 2. Finally, the positive electrode cap plate 6 is disposed on the top of the negative electrode case 2 so that the battery stack 1 and the positive electrode terminal 3 are fixed in the receiving groove 21. The positive electrode terminal 3 of the present embodiment is disposed in the accommodation groove 21 and insulated from the positive electrode cover 6 and the negative electrode case 2, wherein the insulating gasket 7 is disposed between the positive electrode terminal 3 and the positive electrode cover 6, and no direct contact is made between the positive electrode terminal 3 and the negative electrode case 2. The positive electrode terminal 3 is provided with a conductive portion 31, the positive electrode cover 6 is provided with a through hole 62, and the conductive portion 31 protrudes from the through hole 62. In this way, the positive electrode terminal 3 positioned in the housing groove 21 communicates with all the positive electrode tabs 11 of the battery stack 1 through the positive electrode tab group 111, and the conductive portion 31 of the positive electrode terminal 3 protrudes from the through hole 62 so that the battery stack 1 communicates with the outside. Wherein, even if the insulating pad 7 insulates between the positive terminal 3 and the positive cover plate 6, and the conductive portion 31 protrudes from the through hole 62, the insulating pad 7 will be sleeved on the conductive portion 31 and abut against the through hole 62, so as to seal the accommodating groove 21. The positive electrode cover plate 6 of the present embodiment is provided with the liquid injection hole 61, and after the battery is mounted, the electrolyte can be injected into the accommodating groove 21 through the liquid injection hole 61. The electrode-less lug welded battery does not need lug parts, so that the anode and cathode lug materials are greatly saved, the space utilization rate in the battery can be improved, and the energy density of the battery is improved.
The battery laminated core 1 of the present embodiment is formed by sequentially laminating a layer of negative electrode sheets and a layer of positive electrode sheets 11, a separator 13 is disposed between each layer of positive electrode sheets 11 and each layer of negative electrode sheets 12, and preferably, the bottom layer of the battery laminated core 1 is the negative electrode sheet 12, and the top layer is the positive electrode sheet 11. Therefore, the bottom of the battery stack core 1 can be directly contacted with the negative electrode shell 2, and the top of the battery stack core 1 can be directly provided with the positive electrode terminal 3, so that the battery stack core 1 is greatly convenient to install.
Core 1's top is folded at the battery to positive terminal 3 setting, and the welding point of anodal utmost point ear crowd 111 and positive terminal 3 is located the top of one side in holding tank 21, the welding point of negative pole utmost point ear crowd 121 and negative pole casing 2 is located the bottom of holding tank 21 internal opposite side, annotates the top that liquid hole 61 is located the welding point of negative pole utmost point ear crowd 121 and negative pole casing 2. In this way, after the battery stack core 1, the positive terminal 3 and the positive cover plate 6 are mounted, the welding pin 5 can penetrate through the liquid injection hole 61 to weld and fix the negative electrode tab group 121 and the negative electrode shell 2 together, and in this embodiment, by means of the position design of the liquid injection hole 61 and the negative electrode tab group 121, the internal welding connection of the negative electrode tab group 121 and the negative electrode shell 2 is realized, and the welding problem during the design of the electrode-free tab is solved.
Example two
Referring to fig. 1-2, the present embodiment provides a method for manufacturing a battery without electrode tab welding, which includes the following steps:
(a) firstly, a layer of negative plate 12, a layer of diaphragm 13 and a layer of positive plate 11 are sequentially laminated to form a battery laminated core 1, the bottom of the prepared battery laminated core 1 is the negative plate 12, and the top of the prepared battery laminated core 1 is the positive plate 11. The battery stack 1 thus constructed facilitates the next mounting and fixing of the battery stack 1.
(b) All the positive plates 11 on the battery stack core 1 are connected by conduction to form a positive electrode tab group 111, all the negative plates 12 are connected by a lead to form a negative electrode tab group 121, and the positive electrode tab group 111 and the negative electrode tab group 121 are respectively arranged on two sides of the battery stack core 1.
(c) The positive electrode tab group 111 and the positive electrode terminal 3 are welded and fixed, and then the battery stack 1 and the positive electrode terminal 3 are placed in the negative electrode case 2, and at this time, the positive electrode terminal 3 is not directly contacted with the negative electrode case 2. Since the bottom of the battery stack 1 is the negative electrode sheet 12, the bottom of the battery stack 1 can be in direct contact with the negative electrode can 2.
(d) An insulating mat 7 is mounted on the positive terminal 3, and then a positive cover plate 6 is mounted on top of the negative casing 2, at this time, the positive cover plate 6 will abut against the insulating mat 7, so that the battery stack core 1 is fixed in the negative casing 2, and the positive terminal 3 located in the negative casing 2 will not be in direct contact with the negative casing 2.
(e) Subsequently, the negative electrode tab group 121 and the negative electrode case 2 are welded and fixed by the welding pin 5 through the injection hole 61, so that the negative electrode tab 12 of the battery stack 1 and the negative electrode case 2 are connected together.
(f) Then, electrolyte is injected into the negative electrode shell 2 through the liquid injection hole 61, and finally the liquid injection hole 61 is sealed by a sealing element, so that the preparation of the battery without the pole ear can be completed.
The positive electrode tab group 111 and the negative electrode tab group 121 of the present embodiment are respectively disposed on two sides of the battery stack core 1, such that the welding point between the positive electrode tab group 111 and the positive electrode terminal 3 and the welding point between the negative electrode tab group 121 and the negative electrode casing 2 are respectively disposed on two sides of the battery stack core 1, the welding point between the positive electrode tab group 111 and the positive electrode terminal 3 is disposed on the top of the negative electrode casing 2, and the welding point between the negative electrode tab group 121 and the negative electrode casing 2 is disposed on the bottom of the negative electrode casing 2. The battery of this embodiment leaves the position spot-welded with the positive electrode tab group 111 on the positive electrode cover plate 6, the positive electrode tab group 111 after the super-welding is directly spot-welded to the positive electrode terminal 3, the positive electrode terminal 3 and the positive electrode of the battery stack core 1 are put into the accommodating groove 21 of the negative electrode shell 2 after being connected well, the position of the negative electrode tab group 121 of the battery stack core 1 after entering the shell is located under the liquid injection hole 61, the welding needle 5 presses the negative electrode tab group 121 through the liquid injection hole 61 to perform spot-welding, and finally the assembly of the battery is completed. In the embodiment, the position of the liquid injection hole 61 and the welding position of the positive terminal 3 are comprehensively designed according to the characteristics of the battery, and the battery assembly between the positive and negative electrodes of the electrode-less lug and the shell is realized by adopting an internal welding mode, so that the electrode lug materials of the positive and negative electrodes can be saved, and the space utilization rate of the battery can be improved.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (5)
1. The battery welded without the electrode lug is characterized by comprising a negative electrode shell (2) provided with an accommodating groove (21), a battery stack core (1) arranged in the accommodating groove (21), wherein the battery stack core (1) consists of a positive plate (11), a negative plate (12) and a diaphragm (13), a positive electrode cover plate (6) arranged at the top of the negative electrode shell (2), a positive electrode terminal (3) arranged in the accommodating groove (21) and insulated from the positive electrode cover plate (6) and the negative electrode shell (2), and a liquid injection hole (61) is formed in the positive electrode cover plate (6);
a plurality of positive plate (11) are connected and are formed anodal utmost point ear crowd (111), a plurality of negative pole piece (12) are connected and are formed negative pole utmost point ear crowd (121), anodal utmost point ear crowd (111) and positive terminal (3) welded fastening, negative pole utmost point ear crowd (121) and negative pole casing (2) welded fastening, positive terminal (3) set up the top of folding core (1) at the battery, the welding point of anodal utmost point ear crowd (111) and positive terminal (3) is located the top of one side in holding tank (31), the welding point of negative pole utmost point ear crowd (121) and negative pole casing (2) is located the bottom of holding tank (31) interior opposite side, annotate liquid hole (61) and be located the top of the welding point of negative pole utmost point ear crowd (121) and negative pole casing (2).
2. A non-lug welded battery according to claim 1, wherein an insulating gasket (7) is provided between the positive terminal (3) and the positive cover plate (6).
3. A non-lug welded battery according to claim 1, wherein the positive terminal (3) is provided with a conductive portion (31), the positive cover plate (6) is provided with a through hole (62), and the conductive portion (31) protrudes from the through hole (62).
4. The electrode-free ear welded battery according to claim 1, wherein the battery stack core (1) is formed by sequentially laminating a negative electrode sheet and a positive electrode sheet (11), a separator (13) is arranged between each positive electrode sheet (11) and each negative electrode sheet (12), the bottommost layer of the battery stack core (1) is the negative electrode sheet (12), and the topmost layer is the positive electrode sheet (11).
5. A method for preparing a non-lug welded battery according to any of claims 1 to 4, characterized by the following steps:
(a) the negative electrode sheet (12), the diaphragm (13) and the positive electrode sheet (11) are sequentially laminated to form a battery stack core (1);
(b) connecting all positive plates (11) on the battery stack core (1) to form a positive electrode tab group (111), connecting all negative plates (12) to form a negative electrode tab group (121), and respectively arranging the positive electrode tab group (111) and the negative electrode tab group (121) on two sides of the battery stack core (1);
(c) welding and fixing the positive electrode lug group (111) and the positive electrode terminal (3), placing the battery stack core (1) and the positive electrode terminal (3) into the negative electrode shell (2), and directly contacting the negative electrode sheet (12) at the bottom of the battery stack core (1) with the negative electrode shell (2);
(d) an anode cover plate (6) is arranged at the top of the cathode shell (1), and an insulating pad (7) is arranged between the anode cover plate (6) and the anode terminal (3);
(e) a welding needle (5) penetrates through the liquid injection hole (61) to weld and fix the negative pole tab group (121) and the negative pole shell (1);
(f) (ii) a The electrolyte is poured into the pouring hole (61), and the pouring hole (61) is sealed with a sealing material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210211682.5A CN114649651A (en) | 2022-03-04 | 2022-03-04 | Battery welded without electrode lug and preparation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210211682.5A CN114649651A (en) | 2022-03-04 | 2022-03-04 | Battery welded without electrode lug and preparation method |
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| Publication Number | Publication Date |
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| CN114649651A true CN114649651A (en) | 2022-06-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210211682.5A Pending CN114649651A (en) | 2022-03-04 | 2022-03-04 | Battery welded without electrode lug and preparation method |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112072007A (en) * | 2020-09-27 | 2020-12-11 | 广东幺正科技有限公司 | Metal round button cell and sealing method thereof |
| CN212848600U (en) * | 2020-06-15 | 2021-03-30 | 宁德新能源科技有限公司 | Battery with a battery cell |
| CN213401330U (en) * | 2020-09-29 | 2021-06-08 | 广东维都利新能源有限公司 | Button cell with high safety and high energy density |
| CN213520130U (en) * | 2020-12-04 | 2021-06-22 | 珠海冠宇电池股份有限公司 | Button cell and electronic equipment |
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2022
- 2022-03-04 CN CN202210211682.5A patent/CN114649651A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN212848600U (en) * | 2020-06-15 | 2021-03-30 | 宁德新能源科技有限公司 | Battery with a battery cell |
| CN112072007A (en) * | 2020-09-27 | 2020-12-11 | 广东幺正科技有限公司 | Metal round button cell and sealing method thereof |
| CN213401330U (en) * | 2020-09-29 | 2021-06-08 | 广东维都利新能源有限公司 | Button cell with high safety and high energy density |
| CN213520130U (en) * | 2020-12-04 | 2021-06-22 | 珠海冠宇电池股份有限公司 | Button cell and electronic equipment |
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