CN116169438A - Lithium ion battery - Google Patents

Lithium ion battery Download PDF

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Publication number
CN116169438A
CN116169438A CN202310122412.1A CN202310122412A CN116169438A CN 116169438 A CN116169438 A CN 116169438A CN 202310122412 A CN202310122412 A CN 202310122412A CN 116169438 A CN116169438 A CN 116169438A
Authority
CN
China
Prior art keywords
pole
positive
lithium ion
battery
ion battery
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202310122412.1A
Other languages
Chinese (zh)
Inventor
谢东斌
李聪利
李海军
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zhuhai Guangtong Automobile Co Ltd
Gree Altairnano New Energy Inc
Original Assignee
Zhuhai Guangtong Automobile Co Ltd
Gree Altairnano New Energy Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Zhuhai Guangtong Automobile Co Ltd, Gree Altairnano New Energy Inc filed Critical Zhuhai Guangtong Automobile Co Ltd
Priority to CN202310122412.1A priority Critical patent/CN116169438A/en
Publication of CN116169438A publication Critical patent/CN116169438A/en
Pending legal-status Critical Current

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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
    • H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
    • 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
    • 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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/147—Lids or covers
    • H01M50/148—Lids or covers characterised by their shape
    • H01M50/15—Lids or covers characterised by their shape for prismatic or rectangular 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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/183—Sealing members
    • H01M50/186—Sealing members characterised by the disposition of the sealing members
    • H01M50/188—Sealing members characterised by the disposition of the sealing members the sealing members being arranged between the lid and terminal
    • 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
    • H01M50/528—Fixed electrical connections, i.e. not intended for disconnection
    • 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
    • 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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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

The invention discloses a lithium ion battery, which comprises a battery body, a first pole post and a second pole post, wherein the battery body is provided with a positive pole lug and a negative pole lug, the first pole post is fixedly connected with a first switching piece, the second pole post is fixedly connected with a second switching piece, the positive pole lug is in riveting connection with the first switching piece, and the negative pole lug is in riveting connection with the second switching piece, so that the positive pole lug and the negative pole lug are respectively fixedly connected with the first switching piece and the second switching piece. According to the lithium ion battery provided by the invention, the lug and the switching piece are connected in a double-curled-edge riveting mode, so that the effective contact area of the lug and the switching piece is ensured to the greatest extent, the larger overcurrent area and the higher connection strength are more favorably provided under the condition that the sizes of the lugs are the same, and the working condition requirement of high-rate charging and discharging is more favorably adapted.

Description

Lithium ion battery
Technical Field
The invention relates to the technical field of batteries, in particular to a lithium ion battery.
Background
In the growing big data age, environmental protection becomes the trend of future development, wherein new energy is used as a representative of environmental protection development, and more vehicles, electric tools, unmanned aerial vehicles, unmanned boats and the like select lithium batteries.
The safety performance is one of important indexes for measuring the performance of the lithium ion battery. In the prior art, the connection mode between the electrode assembly and the cover plate of the lithium ion battery is mainly that the lug of the electrode assembly and the adapter plate are firstly subjected to ultrasonic welding, and then the adapter plate is assembled on the cover plate in a laser welding mode.
Although the structure is relatively simple and has larger space, the structure is limited by the influences of factors such as length and width of welding spots, welding power focal distance slag splashing and the like, and phenomena such as insufficient welding area or short circuit of cold joint often occur, and when the structure is applied to a battery charged and discharged at a high rate, phenomena such as insufficient overcurrent capacity of the internal structure of the battery, abnormal temperature rise and short circuit and the like are caused, so that the performance of the battery is influenced.
Disclosure of Invention
The invention aims to provide a lithium ion battery to solve the technical problem that low capacity and low voltage caused by lack of welding can occur in a welding mode.
In order to achieve the above purpose, the specific technical scheme of the lithium ion battery of the invention is as follows:
the invention provides a lithium ion battery, which comprises a battery body, a first pole post and a second pole post, wherein the battery body is provided with a positive pole lug and a negative pole lug, the first pole post is fixedly connected with a first switching piece, the second pole post is connected with a second switching piece, the positive pole lug is in riveting connection with the first switching piece, and the negative pole lug is in riveting connection with the second switching piece, so that the positive pole lug and the negative pole lug are respectively fixedly connected with the first switching piece and the second switching piece.
As the preferred embodiment provided by the invention, the battery body comprises a first electric core and a second electric core, the first switching sheet is arranged at the end parts of the first electric core and the second electric core, the two opposite sides of the first switching sheet are provided with first connecting parts, and the positive electrode lugs arranged at the two ends of the battery body are respectively mutually wound and laminated with the first connecting parts so as to ensure that the positive electrode lugs are fixedly connected with the first switching sheet.
As a preferred embodiment provided by the invention, the connecting part comprises a plurality of layers of plate-shaped structures which are stacked, the positive electrode tab and the end face of the battery body are vertically arranged, so that the positive electrode tab and the plurality of layers of plate-shaped structures are alternately arranged, and the positive electrode tab and the first connecting sheet are fixed by riveting and pressing.
As a preferred embodiment provided by the present invention, the connection parts and the positive electrode tabs are alternately arranged in a stacked manner to be horizontally arranged with respect to the end face of the battery body.
As a preferred embodiment provided by the invention, two ends of the first switching sheet are fixedly connected with the positive electrode lug, and two ends of the second switching sheet are fixedly connected with the negative electrode lug.
The invention provides a preferred embodiment, which further comprises a cover plate assembly, wherein the cover plate assembly is welded and fixed with the first pole and the second pole respectively.
As a preferred embodiment provided by the invention, the cover plate assembly comprises a cover plate body, wherein the cover plate body is provided with a positive pole and a negative pole, the positive pole and the first pole are welded and fixed, and the negative pole and the second pole are welded and fixed.
As the preferred embodiment provided by the invention, the cover plate body is provided with the first mounting hole, the first mounting hole is fixed with the positive pole in a sealing way, the positive pole is provided with the mounting hole, the cylindrical surface of the first pole is fixed with the mounting hole of the positive pole in a clamping way, and the positive pole and the end part of the first pole are welded and fixed.
As the preferred embodiment provided by the invention, the surface of the positive pole and the surface of the cover plate body are provided with the isolating ring, the positive pole and the isolating ring are integrally formed by injection molding, and the bottom surface of the cover plate body is provided with the plastic plate.
As a preferred embodiment provided by the invention, the bottom surface of the cover plate body is provided with a plastic plate.
The lithium ion battery has the following advantages:
according to the lithium ion battery provided by the invention, the lug and the adapter piece are connected in a double-curled-edge riveting mode, so that the effective contact area of the lug and the adapter piece is ensured to the greatest extent, and the lithium ion battery is more beneficial to providing a larger overcurrent area and higher connection strength under the condition that the sizes of the lug are the same, and is more beneficial to adapting to a battery charged and discharged at a high multiplying power.
Drawings
Fig. 1 is a schematic diagram of an explosion structure of a lithium ion battery according to the present invention;
fig. 2 is a schematic diagram of an explosion structure of the lithium ion battery provided by the invention;
fig. 3 is a left side view of the lithium ion battery provided by the invention;
FIG. 4 is an enlarged partial schematic view of portion A of FIG. 3;
fig. 5 is a second left side view of the lithium ion battery provided by the invention;
FIG. 6 is an enlarged partial schematic view of portion B of FIG. 5;
fig. 7 is a cross-sectional view of a cover plate assembly in a lithium ion battery provided by the invention;
fig. 8 is a front view of a cover plate body in a lithium ion battery provided by the invention;
fig. 9 is a cross-sectional view of a cover plate and a seal ring in a lithium ion battery provided by the invention;
fig. 10 is a schematic diagram of the overall structure of the positive electrode post in the cap plate assembly provided by the invention;
FIG. 11 is a cross-sectional view of a positive post in a cap plate assembly provided by the present invention;
FIG. 12 is a schematic view of the overall structure of the positive electrode post and separator in the cap plate assembly provided by the present invention;
fig. 13 is a cross-sectional view of the positive electrode post and separator in the cap plate assembly provided by the present invention.
Fig. 14 is a right side view of a lithium ion battery according to the present invention
FIG. 15 is an enlarged partial view of the portion C of FIG. 14
Reference numerals illustrate: 1. a battery body; 11. a positive electrode tab; 2. a cover plate assembly; 21. a positive electrode post; 211. a spacer ring; 22. a negative electrode column; 23. a cover plate body; 231. a first mounting hole; 232. a second mounting hole; 24. a plastic plate; 25. a seal ring; 3. a first pole; 31. a first tab; 311. a first connection portion; 4. a second post; 41. a second switching piece; 411. a second connecting portion; 51. and a negative electrode tab.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention. In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In addition, the technical features of the different embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
As shown in fig. 1 to 11, the lithium ion battery provided in the embodiment of the invention is described in detail below.
The embodiment of the invention provides a lithium ion battery, which comprises a shell, a battery body 1 and a cover plate assembly 2, wherein an accommodating space is formed in the shell, an opening is formed in the top of the shell, and the cover plate assembly 2 is plugged at the opening so that the accommodating space forms a closed space. The cover plate assembly 2 specifically comprises a cover plate body 23, a positive pole column 21, an explosion-proof valve and a negative pole column 22, wherein the positive pole column 21, the explosion-proof valve and the negative pole column 22 are arranged on the cover plate body 23, and the positive pole column 21 and the negative pole column 22 can serve as electric connection terminals of the whole secondary battery so as to conveniently realize energy storage of the secondary battery and output electric energy stored by the secondary battery; the explosion-proof valve is used to prevent the secondary battery from exploding during the charge and discharge processes. The cover plate body 23 can be provided with a liquid injection hole, the sealing nail is sealed in the liquid injection hole, electrolyte can be injected into the secondary battery through the liquid injection hole, after the liquid injection operation is finished, the sealing nail is plugged at the liquid injection hole to prevent the electrolyte from leaking out of the liquid injection hole, and meanwhile, impurities and water vapor in the external environment are prevented from entering the secondary battery.
Further, the battery body 1 includes a first electric core and a second electric core, and the surfaces of the first electric core and the second electric core are attached to each other, so that the first electric core and the second electric core are fixed to form the battery body 1. The first battery cell and the second battery cell are identical in size and structure, and form the battery body 1 together.
The battery body 1 is provided with positive electrode tab 11 and negative electrode tab 51 on one end face, and positive electrode tab 11 and negative electrode tab 51 symmetry set up on the terminal surface of battery body 1, are provided with certain interval in the middle of positive electrode tab 11 and the negative electrode tab 51 to when making apron subassembly 2 and battery body 1 fixed mutually, the intermediate position of positive electrode tab 11 and negative electrode tab 51 can hold explosion-proof valve isotructure.
As a preferred embodiment, two positive electrode tabs 11 and two negative electrode tabs 51 are disposed opposite to each other on the end face of the battery body 1, and only the structure of the positive electrode tab 11 is described below, and the structure of the negative electrode tab 51 and the structure of the positive electrode tab 11 are symmetrically disposed, which will not be described in detail below.
Further, two positive electrode lugs 11 are arranged on the end face of the battery body 1, the two positive electrode lugs 11 are symmetrically arranged on the battery body 1, so that one positive electrode lug 11 is fixed on the first electric core, and the other positive electrode lug 11 is fixed on the second electric core, and therefore the two positive electrode lugs 11 are symmetrically arranged. In a specific embodiment, the positive electrode tab 11 and the negative electrode tab 51 extend along the end face of the battery body 1 toward the end face far from the battery body 1, and generally, the positive electrode tab 11 and the negative electrode tab 51 are provided with a certain length, so as to be convenient for fixation.
Further, a first pole 3 is provided on the end face of the battery body 1, and the first pole 3 and the first switching piece 31 are fixedly connected so that the first pole 3 and the first switching piece 31 are formed integrally. The first tab 31 spans the first and second cells, and the first pole 3 is disposed at the center of the tab, i.e., at the junction of the first and second cells. Of course, it is understood that the second switching piece 41 is disposed at a position corresponding to the negative electrode tab 51, and the fixing manner of the negative electrode tab 51 is the same as that of the positive electrode tab 11.
Further, the positive electrode tab 11 provided at both ends and both sides of the first switching tab 31 are respectively connected, both ends of the first switching tab are provided with connection portions including a multi-layer plate-like structure laminated arrangement, the positive electrode tab 11 and the end face of the battery body 1 are vertically arranged so that the positive electrode tab 11 and the multi-layer plate-like structure are overlapped and pressed by riveting, thereby realizing the fixation of the positive electrode tab 11 and the first switching tab.
Specifically, the adapter part of the first connecting piece is bent upwards in a direction away from the end face of the battery body 1, then is bent downwards continuously along a direction close to the end face of the battery body 1, and is bent downwards along a direction close to the end face of the battery body 1, so that the connecting part forms a three-layer plate-shaped structure, and the positive electrode tab 11 is accommodated between the plate-shaped structures of two adjacent layers. The positive electrode tab 11 is of a multi-layer sheet structure, has certain toughness, and is mutually attached and wound at least one circle, so that the positive electrode tab 11 and the connecting part are mutually fixed.
The positive electrode tab 11 and the first switching tab 31 provided in the above embodiment are connected by crimping and riveting, so that the battery cell and the tab are not welded, and the phenomena of thermal influence of welding on the battery cell, short circuit of the battery cell caused by welding slag splashing during welding and the like are eliminated. The battery is more favorable for providing larger overcurrent area and higher connection strength under the condition that the sizes of the lugs are the same, and is more favorable for adapting to the battery with high-rate charge and discharge. The electrode lugs are connected with the adapter plate in a double-crimping riveting mode, so that the electrode lugs are little damaged, the connection strength is high, all the electrode lugs can be ensured to be connected when the battery core adopts a lamination process, and the low-capacity and low-voltage phenomenon caused by welding process defects (cold welding, fusing or fracturing the electrode lugs and the like) is eliminated.
As a preferred embodiment, the structure in which the positive electrode tab 11 and the first tab 31 are stacked, wound and riveted to each other is perpendicular to the end face of the battery body 1, and projections are formed at both ends of the end face of the battery.
As another embodiment provided by the present invention, the positive electrode tab 11 and the first switching tab 31 may be further fixed by other connection methods, and a second embodiment provided by the present invention will be described below.
The press-riveting of the positive electrode tab 11 and the first tab 31 provided by the present invention is not limited to the above-mentioned upward double-hemming press-riveting method, and may also adopt downward double-hemming press-riveting or other connection methods including a press-riveting process. Of course, it is understood that the connection manner of the positive electrode tab 11 and the first tab 31 may be set to exhibit other directions of press-riveting connection.
Specifically, the positive electrode tab 11 and the first switching tab 31 are connected through press riveting, the negative electrode tab 51 and the second switching tab 41 are connected through press riveting, one ends of the first switching tab 31 and the second switching tab 41 are respectively connected with the positive electrode tab 11 and the negative electrode tab 51, and the other ends of the first switching tab 31 and the second switching tab 41 are respectively welded with the positive electrode post 21 and the negative electrode post 22 arranged on the cover plate assembly 2 in a penetrating manner, so that the positive electrode tab 11 and the negative electrode tab 51 are respectively welded and fixed with the first connecting tab and the second connecting tab. The connection portions and the positive electrode tabs 11 are stacked alternately and horizontally arranged with respect to the end face of the battery body 1. By adopting the press riveting connection mode of the embodiment, the effective contact area of the lug and the switching piece is guaranteed to the greatest extent, the overcurrent area is provided to a greater extent, and the large current is more facilitated to pass through. Of course, it can be understood that the riveting mode is not limited to the above riveting mode, and the tab and the adapter piece are connected by riveting in various crimping riveting modes to obtain a larger overcurrent contact area and higher connection strength.
Further, the cover plate component 2 is welded and fixed with the first pole 3 and the second pole 4 respectively. The cover plate assembly 2 comprises a cover plate body 23, wherein the cover plate body 23 is provided with a positive pole 21 and a negative pole 22, the positive pole 21 and the first pole 3 are welded and fixed, and the negative pole 22 and the second pole 4 are welded and fixed.
Specifically, the cover plate body 23 is provided with a first mounting hole 231 and a second mounting hole 232, and a space is provided between the first mounting hole 231 and the second mounting hole 232, so that the explosion-proof valve and other structures are arranged between the first mounting hole 231 and the second mounting hole 232, thereby forming the cover plate assembly 2.
Further, the first mounting hole 231 and the second mounting hole 232 are fixedly connected with the positive pole post 21 and the negative pole post 22 respectively, and the positive pole post 21 and the negative pole post 22 are welded and fixed with the first pole post 3 and the second pole post 4 respectively, so that the cover plate assembly 2 and the battery body 1 are fixed, the battery body 1 is placed in the shell, the cover plate assembly 2 and the shell are clamped and fixed, and accordingly the power battery is assembled.
Further, the sealing ring 25 is sleeved on the first mounting hole 231 and the second mounting hole 232 which are formed in the cover plate body 23 respectively, and the sealing ring 25 is clamped and fixed with the first mounting hole 231 and the second mounting hole 232 respectively, so that the assembly of the sealing ring 25 and the cover plate body 23 is realized, the electrolyte in the battery body 1 is ensured not to flow outwards, and the sealing of the electrolyte is realized.
Further, the outer walls of the positive electrode post 21 and the negative electrode post 22 are provided with the first connection portion 311, and the first connection portion 311 may be provided as a step, however, it is understood that the first connection portion 311 may be provided in other structures as long as a component can be sleeved on the first connection portion 311.
As a preferred embodiment, a spacer 211 is sleeved on the connecting portion of the positive electrode post 21 and the negative electrode post 22, so that the spacer 211 is sleeved on the end portion of the positive electrode post 21, and the end face of the spacer 211 is lower than the end face of the positive electrode post 21, thereby realizing fixation of the spacer 211.
The positive electrode post 21 and the negative electrode post 22 with the separator 211 are assembled as one body with the cap plate body 23, respectively, which has been assembled. The positive electrode post 21 and the negative electrode post 22 are respectively sealed and fixed with the first mounting holes 231 and the second mounting holes 232, so that the positive electrode post 21 and the negative electrode post 22 are clamped and fixed with the cover plate body 23. The spacer 211 of the assembled positive electrode post 21 and negative electrode post 22 is abutted against the upper surface of the cover plate body 23, so that the positive electrode post 21 and the negative electrode post 22 are clamped on the cover plate body 23.
Further, the positive electrode post 21 and the negative electrode post 22 of the cover plate body 23 are provided with assembly holes for fixedly connecting the first electrode post 3 and the second electrode post 4 on the battery body 1, thereby realizing the fixed connection of the battery body 1 and the cover plate assembly 2.
Further, a plastic ring is arranged at the bottom of the cover plate body 23, and the plastic ring is fixedly connected with the cover plate body 23 through riveting. Whereby the above-described mounting structure forms the cover plate assembly 2.
Further, the cover plate body 23 is provided with a first mounting hole 231, the first mounting hole 231 and the positive pole 21 are fixed in a sealing manner, the positive pole 21 is provided with an assembly hole, the cylindrical surface of the first pole 3 and the assembly hole of the positive pole 21 are clamped and fixed, and the positive pole 21 and the end part of the first pole 3 are welded and fixed.
Specifically, the side wall of the first pole 3 is configured as a stepped structure, the first pole 3 includes a first column and a second column, the first column is connected with the second column, and the diameter of the first column is smaller than that of the second column, so that the first column and the second column are fixedly connected, which is, of course, an integrated structure as a preferred embodiment.
Further, the first column body and the assembly hole of the positive electrode column 21 are fixed in a plugging manner, so that the bottom surface of the positive electrode column 21 and the upper surface of the second column body are in contact in an abutting manner, and the cover plate assembly 2 and the battery body 1 are pre-fixed. After the end face of the first column body is aligned with the end face of the positive electrode column 21, the first column body and the positive electrode column 21 are welded and fixed, so that the cover plate assembly 2 and the battery body 1 are fixedly connected.
Further, the assembled cover plate assembly 2 is welded with the battery body 1 placed in the case, and the welding into the case is completed.
It should be understood that, for the assembly structure on one side of the negative electrode post 22, the assembly structure of the positive electrode post 21 provided in the above embodiment is the same, and the positive electrode post 21 and the negative electrode post 22 are symmetrically disposed, so that the connection structure and the assembly relationship related to the portion of the negative electrode post 22 are not specifically described herein, please refer to the connection relationship and the assembly manner of the related portion of the positive electrode post 21.
Further, the specific installation steps of the lithium ion battery provided by the embodiment of the invention are described in detail below, and the following assembly sequence is adopted in a specific practical process.
First, the first tab 31 and the positive electrode tab 11 are fixed by crimping and the second tab 41 and the negative electrode tab 51 are fixed by crimping through a double-crimping process. Thereby realize that battery body 1 and first tab 31 and anodal utmost point ear 11, battery body 1 and second tab 41 and negative pole tab 51 do not have welded fastening, anodal utmost point ear 11 and negative pole tab 51 and first tab 31 and second tab 41's riveting is fixed can go on simultaneously to improve riveting efficiency. The electrode lug and the switching piece are connected in a double-crimping riveting mode, so that the effective contact area of the electrode lug and the switching piece is guaranteed to the greatest extent, the overcurrent area is provided to a greater extent, and the large current is more facilitated to pass through. The electrode lugs are connected with the adapter plate in a double-crimping riveting mode, so that the electrode lugs are little damaged, the connection strength is high, all the electrode lugs can be ensured to be connected when the battery core adopts a lamination process, and the low-capacity and low-voltage phenomenon caused by welding process defects (cold welding, fusing or fracturing the electrode lugs and the like) is eliminated. The electrode lug is connected with the switching piece in a double-curling riveting mode, so that the electrode lug of the battery cell is not welded, and the phenomena of thermal influence of welding on the battery cell, short circuit of the battery cell caused by welding slag splashing during welding and the like are eliminated.
Next, the cap plate assembly 2 is assembled, and the positive electrode post 21 and the negative electrode post 22 are injection-molded with the separator 211, respectively, so that the separator 211 is provided on the outer walls of the positive electrode post 21 and the negative electrode post 22. The positive electrode post 21 and the negative electrode post 22 before caulking are injection-molded with the separator 211 to form the positive electrode post 21 and the negative electrode post 22 with the separator 211, respectively.
And sealing rings 25 are arranged on the first mounting holes 231 and the second mounting holes 232 arranged on the cover plate body 23, and the sealing rings 25 are sleeved on the first mounting holes 231 and the second mounting holes 232, so that the sealing rings 25, the first mounting holes 231 and the second mounting holes 232 are assembled.
Further, the positive electrode column 21 provided with the spacer ring 211 and the negative electrode column 22 provided with the spacer ring 211 are respectively clamped and fixed with the cover plate body 23 provided with the sealing ring 25, so that the cover plate assembly 2 is assembled. The assembled positive electrode post 21 with the separator 211 and the assembled negative electrode post 22 with the separator 211, and the first and second fitting holes with the seal ring 25 are riveted to form the cap plate assembly 2.
Finally, inserting the double-curled-edge riveting connected battery body 1, the first pole column 3 and the second pole column 4 into assembly holes formed on the positive pole column 21 and the negative pole column 22 to realize pre-fixing of the cover plate assembly 2 and the battery body 1, and then aligning the end face of the first pole column 3 with the end face of the positive pole column 21 and then welding and fixing; similarly, the end face of the second post 4 and the end face of the negative post 22 are aligned and then welded and fixed, thereby forming a fixed connection between the battery body 1 and the cap assembly 2. And then the finished cover plate assembly 2 and the battery body 1 are carried out, so that the lithium ion battery is formed.
According to the lithium ion battery provided by the invention, the lug and the switching piece are connected in a double-curled-edge riveting mode, so that the effective contact area of the lug and the switching piece is ensured to the greatest extent, the overcurrent area is provided to a greater extent, and the large current is more facilitated to pass through. The electrode lugs are connected with the adapter plate in a double-crimping riveting mode, so that the electrode lugs are little damaged, the connection strength is high, all the electrode lugs can be ensured to be connected when the battery core adopts a lamination process, and the low-capacity and low-voltage phenomenon caused by welding process defects, cold welding, fusing or fracturing the electrode lugs and the like is eliminated. The electrode lug is connected with the switching piece in a double-curling riveting mode, so that the electrode lug of the battery cell is not welded, and the phenomena of thermal influence of welding on the battery cell, short circuit of the battery cell caused by welding slag splashing during welding and the like are eliminated.
The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the same, but rather, various modifications and variations may be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.
It will be understood that the invention has been described in terms of several embodiments, and that various changes and equivalents may be made to these features and embodiments by those skilled in the art without departing from the spirit and scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.

Claims (10)

1. The utility model provides a lithium ion battery, its characterized in that includes battery body, first utmost point post and second post, is provided with anodal utmost point ear and negative pole utmost point ear on the battery body, first utmost point post and first changeover piece fixed connection, second post and second changeover piece fixed connection, anodal utmost point ear and first changeover piece riveting are connected, negative pole utmost point ear and second changeover piece riveting are connected to make anodal utmost point ear, negative pole utmost point ear respectively with first changeover piece and second changeover piece fixed connection.
2. The lithium ion battery of claim 1, wherein the battery body comprises a first cell and a second cell, the first switching piece and the second switching piece are respectively arranged at the end parts of the first cell and the second cell, the first connecting part and the second connecting part are respectively arranged at two opposite sides of the first switching piece and the second switching piece, the positive electrode lugs arranged at two ends of the battery body are respectively overlapped with the first connecting part so as to fixedly connect the positive electrode lugs and the first switching piece, and the negative electrode lugs arranged at two ends of the battery body are respectively overlapped with the second connecting part so as to fixedly connect the negative electrode lugs and the second switching piece.
3. The lithium ion battery according to claim 2, wherein the connection portion comprises a single-layer or multi-layer plate-like structure laminated arrangement, the positive and negative electrode tabs are arranged vertically with the end faces of the battery body so that the positive and negative electrode tabs and the first and second connection portions are overlapped and pressed by caulking, thereby achieving the fixation of the positive and negative electrode tabs and the first and second connection pieces.
4. The lithium ion battery of claim 2, wherein the first and second connection portions and the positive and negative electrode tabs are disposed to overlap each other and are disposed horizontally or vertically with respect to the end face of the battery body.
5. The lithium ion battery of claim 4, wherein the first tab is riveted to the positive tab and the second tab is riveted to the negative tab.
6. The lithium ion battery of claim 1, further comprising a cover plate assembly welded to the first and second posts, respectively.
7. The lithium ion battery of claim 6, wherein the cover assembly comprises a cover body, the cover body is provided with a positive pole and a negative pole, the positive pole is welded to the first pole, and the negative pole is welded to the second pole.
8. The lithium ion battery of claim 7, wherein the cover plate body is provided with a first mounting hole, the first mounting hole is sealed and fixed with the positive pole, the positive pole is provided with an assembly hole, the cylindrical surface of the first pole is clamped and fixed with the assembly hole of the positive pole, and the end parts of the positive pole and the first pole are welded and fixed.
9. The lithium ion battery of claim 7, wherein the positive electrode post and the surface of the cover plate body are provided with a spacer, and the positive electrode post and the spacer are integrally injection molded.
10. The lithium ion battery of claim 7, wherein the bottom surface of the cover plate body is provided with a plastic plate, and the plastic plate is arranged at one side close to the tab.
CN202310122412.1A 2023-02-14 2023-02-14 Lithium ion battery Pending CN116169438A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310122412.1A CN116169438A (en) 2023-02-14 2023-02-14 Lithium ion battery

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310122412.1A CN116169438A (en) 2023-02-14 2023-02-14 Lithium ion battery

Publications (1)

Publication Number Publication Date
CN116169438A true CN116169438A (en) 2023-05-26

Family

ID=86417881

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202310122412.1A Pending CN116169438A (en) 2023-02-14 2023-02-14 Lithium ion battery

Country Status (1)

Country Link
CN (1) CN116169438A (en)

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