CN208444887U - A kind of high sensitivity security protection lithium ion battery - Google Patents
A kind of high sensitivity security protection lithium ion battery Download PDFInfo
- Publication number
- CN208444887U CN208444887U CN201820838120.2U CN201820838120U CN208444887U CN 208444887 U CN208444887 U CN 208444887U CN 201820838120 U CN201820838120 U CN 201820838120U CN 208444887 U CN208444887 U CN 208444887U
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- Prior art keywords
- battery
- lithium ion
- security protection
- ion battery
- high sensitivity
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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
Abstract
The utility model discloses a kind of highly sensitive security protection lithium ion batteries, belong to technical field of lithium ion.The highly sensitive security protection lithium ion battery, including shell and the cover board being covered on shell, the cover board is equipped with pressure turnover mechanism, the inner cavity of the shell be provided with outer cover set up defences water bag battery core and low-boiling-point substance for opening the pressure turnover mechanism after gasifying.The utility model is by being added low-boiling-point substance in inside battery, inside battery chemical reaction to a certain extent but not up to thermal runaway state when, battery heat release causes low-boiling-point substance and largely volatilizees, cell internal pressure increases suddenly so that the pressure turnover mechanism on cover board is opened, external short-circuit of battery occurs, and then being electrically connected between pole and battery core is blocked, electrochemical reaction terminates in time.In lower temperature range internal cutting off electrochemical reaction, it is obviously improved the sensitivity of cell safety protection, effectively controls the battery thermal runaway phenomenon under over-charging of battery or hot conditions.
Description
Technical field
The utility model relates to technical field of lithium ion, and in particular to a kind of high sensitivity security protection lithium-ion electric
Pond.
Background technique
Lithium-ion-power cell is close as the continuous improvement that electric car course continuation mileage requires needs constantly to promote its energy
Degree, incident problem is the safety issue of lithium-ion-power cell.In the case where the abuse conditions such as overcharging, puncturing, squeeze, electricity
Pond short circuit occurred inside, battery temperature quickly increase, and when temperature increases to a certain extent, thermal runaway, Jin Eryin occur for battery
Initiate the safety problems such as fire or explosion.
For high energy battery overcharge with the safety problems such as short circuit, more advanced technology path is in lithium battery cap at present
Rotating sheet is set on plate, and when inner pressure of lithium ion battery is more than certain value, rotating sheet is overturn upward, so that lithium battery is just
Between pole and cathode short circuit and by connection sheet fuse mechanism suspension lithium battery interior electrochemical reaction, to ensure high-energy lithium
The safety of ion battery.
As 204809304 U of patent document CN discloses a kind of lithium ion battery with safeguard construction, including the first pole
Column, the second pole, shell and the lamina tecti being covered on shell, further include short board and rotating sheet, and rotating sheet is set to short
The lower section of road plate and be electrically connected with lamina tecti, when inner pressure of lithium ion battery is more than reference pressure rotating sheet can overturn and
It is contacted with short board, short board is electrically connected with the first pole, and the second pole is electrically connected with lamina tecti, and rotating sheet is electrically connected with lamina tecti
It connects, rotating sheet includes contact portion, collateral support part and bending part, and contact portion is equipped with the contact surface parallel with short board, contact surface
Coat bonding agent.
Contact of the above-mentioned lithium ion battery by short board with rotating sheet forms short-circuit loop, to work as by contact surface and turn over
Rotor can sufficiently be connect when overturning with short board, and bonding agent ensure that contact portion contacts securely with short board, effectively avoid lithium
The danger of explosion spontaneous combustion occurs for ion battery, simple and reliable for structure.
Due to high energy battery overcharge to a certain extent or short circuit when, inside battery reaction acutely, cell internal pressure with
Temperature increases rapidly, even if rotating sheet is flipped and connection sheet is made to be fused, but since internal temperature of battery is moment
It rises violently, inside battery reaction not only can not stop and be further exacerbated by immediately, so battery cover board setting rotating sheet is but difficult to fastly
Thermal runaway phenomenon in fast sensitive control over-charging of battery or short-circuit process.
Utility model content
The purpose of this utility model is to provide a kind of lithium ion batteries with highly sensitive security protection, may be implemented
Quickly control the thermal runaway phenomenon in over-charging of battery or short-circuit process.
To achieve the above objectives, the present invention adopts the following technical solutions:
A kind of high sensitivity security protection lithium ion battery, including shell and the cover board being covered on shell, the cover board
Be equipped with pressure turnover mechanism, the inner cavity of the shell be provided with outer cover set up defences water bag battery core and for gasify after open
The low-boiling-point substance of the pressure turnover mechanism.
Since the boiling point of low-boiling-point substance is lower, when inside battery chemically reacts to a certain extent, battery heat release causes low-boiling-point substance
Volatilization, cell internal pressure increases the reference pressure more than pressure turnover mechanism suddenly, starts pressure turnover mechanism, formed external short
Road circuit terminates inside battery chemical reaction, effective prevention and control generation of thermal runaway phenomenon in time.
The boiling point for the low-boiling-point substance that the utility model uses is less than the temperature reached when battery thermal runaway state, then in battery
Not up to thermal runaway state when, low-boiling-point substance largely volatilizees so that cell internal pressure increases sharply, the electricity before thermal runaway generation
Pond internal pressure reaches the reference pressure of pressure turnover mechanism starting.Preferably, the low-boiling-point substance is ethyl alcohol, carbonic acid diformazan
One or more of ester, thiacyclohexane, isopropanol.
Preferably, the low-boiling-point substance is filled between battery core and shell.According to battery concrete model, battery core capacity and electricity
The parameters such as the accommodation space between core and shell adjust the dosage of low-boiling-point substance, and to meet, in battery, low-boiling-point substance is waved before thermal runaway
Hair is so that cell internal pressure reaches the requirement of the reference pressure of pressure turnover mechanism starting, while not influencing the normal work of battery
Make.
The battery core outer cover is set up defences water bag, prevents low-boiling-point substance from entering battery core internal influence electrochemical reaction.The waterproof
Bag uses high temperature-resistant polymer material, preferably, in the material polypropylene of the waterproof bag, polyimides, polyphenylene sulfide
One or more.
Preferably, the waterproof bag with a thickness of 40-60 μm.
The battery core is by positive plate, negative electrode tab and diaphragm lamination or winds, and two or more tabs of battery core are located at
Battery core top side, cell polar ear are electrically connected with the pole on cover board.
The cover board is equipped with the first pole and the second pole, and the pressure turnover mechanism includes short board and rotating sheet,
The short board is electrically connected with first pole, and second pole is electrically connected with the cover board, and the rotating sheet is set to
It the lower section of the short board and is electrically connected with the cover board, the overturning when inner pressure of lithium ion battery is more than reference pressure
Piece can overturn and contact with short board.
Preferably, second pole is connect by fuse metal piece with the tab of the battery core.When pressure tipper
Structure starting, occurs external short-circuit of battery, the fusing of fuse metal piece, and inside battery electrochemical reaction terminates.
Fuse metal piece uses lower melting-point material, preferably, the material of the fuse metal piece is lead, antimony, tin
Or its alloy.
Compared with prior art, the utility model have the utility model has the advantages that
By the way that low-boiling-point substance is added in inside battery, inside battery is chemically reacted to a certain extent but is not up to the utility model
When thermal runaway state, battery heat release causes low-boiling-point substance and largely volatilizees, and cell internal pressure increases suddenly so that the pressure on cover board is overturn
Mechanism is opened, and external short-circuit of battery occurs, and then block being electrically connected between pole and battery core, electrochemical reaction terminates in time.
Lithium ion battery provided by the utility model is obviously improved battery in lower temperature range internal cutting off electrochemical reaction
The sensitivity of security protection effectively controls the battery thermal runaway phenomenon under over-charging of battery or hot conditions.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the utility model.
Specific embodiment
The utility model is described in further detail combined with specific embodiments below.
Embodiment 1
As shown in Figure 1, high sensitivity security protection lithium ion battery provided in this embodiment is rectangular cell, including shell
1 and the cover board 2 that is covered on shell, 1 material of shell be aluminium alloy, with a thickness of 0.8mm, cover board 2 is equipped with positive terminal 21 and negative
Pole 22, positive terminal 21 and cover board 2 have the conductance general character, and 22 side of negative terminal is equipped with pressure turnover mechanism 3.
Pressure turnover mechanism 3 includes rotating sheet and short board, and short board is electrically connected with negative terminal 22, and rotating sheet is set to short
The lower section of road plate and be electrically connected with cover board, when inner pressure of lithium ion battery reaches 0.5MPa rotating sheet can be flipped and with
Short board contact, forms external short-circuit of battery circuit, and specific structure can refer to 204809304 U of Chinese patent publication CN.
The inner cavity of shell 1 is provided with outer cover and sets up defences the battery core 5 of water bag 4, and battery core 5 is multi pole ears winding-structure and positive and negative anodes
Ear is respectively positioned on top side, and positive and negative tab is electrically connected with positive terminal 21, negative terminal 22 respectively.Positive terminal 21 passes through fuse metal piece
6 connect with the tab of battery core 5, and when external short-circuit of battery, the fusing of fuse metal piece occurs, inside battery electrochemical reaction stops.
Fuse metal piece 6 is using lower melting-point materials such as lead, antimony, tin or its alloys.
Low-boiling-point substance 7 is filled between shell 1 and battery core 5, low-boiling-point substance 7 uses ethyl alcohol, and the liquid level of ethyl alcohol is lower than battery core 5
The 2/3 of height.
To prevent low-boiling-point substance 7 from entering 5 internal influence electrochemical reaction of battery core.It sets up defences water bag 4 in 5 outer cover of battery core, waterproof
Bag 4 is the square bag of sealing, and the tab that battery core 5 is exposed on top is connect with the pole on cover board 2.Waterproof bag 4 uses high temperature resistant
High molecular material polypropylene, with a thickness of 60 μm.
When battery overcharges or when the safety problems such as short circuit, inside battery chemical reaction acutely causes temperature to rise violently, second
Alcohol starts largely to volatilize at 78 DEG C, and cell internal pressure is caused to increase rapidly, and causes when battery temperature is not up to 100 DEG C and turn over
Rotor overturning causes battery plus-negative plate short-circuit, so that fuse metal piece 6 fuses, terminates inside battery electrochemical reaction, finally has
Imitate the generation of prevention and control battery thermal runaway phenomenon.
Embodiment 2
High sensitivity security protection lithium ion battery difference from Example 1 provided in this embodiment is that shell 1 is adopted
With stainless steel, with a thickness of 0.6mm, waterproof bag 4 uses polyimides, with a thickness of 40 μm.
Embodiment 3
High sensitivity security protection lithium ion battery difference from Example 1 provided in this embodiment is that battery core 5 is
Lamination, low-boiling-point substance 7 use 5ml thiacyclohexane, start a large amount of volatilizations at 81 DEG C or so.
The foregoing is merely the specific implementation cases of the utility model patent, but the technical characteristic of the utility model patent is simultaneously
Not limited to this, in the field of the utility model, made changes or modifications all cover any those skilled in the relevant art
Among the scope of the patents of the utility model.
Claims (8)
1. a kind of high sensitivity security protection lithium ion battery, including shell and the cover board being covered on shell, on the cover board
Equipped with pressure turnover mechanism, which is characterized in that the inner cavity of the shell be provided with outer cover set up defences water bag battery core and be used for
The low-boiling-point substance of the pressure turnover mechanism is opened after gasification.
2. high sensitivity security protection lithium ion battery as described in claim 1, which is characterized in that the low-boiling-point substance is second
One or more of alcohol, dimethyl carbonate, thiacyclohexane, isopropanol.
3. high sensitivity security protection lithium ion battery as described in claim 1, which is characterized in that the low-boiling-point substance is filled in
Between battery core and shell.
4. high sensitivity security protection lithium ion battery as described in claim 1, which is characterized in that the material of the waterproof bag
For one or more of polypropylene, polyimides, polyphenylene sulfide.
5. high sensitivity security protection lithium ion battery as described in claim 1, which is characterized in that the thickness of the waterproof bag
It is 40-60 μm.
6. high sensitivity security protection lithium ion battery as described in claim 1, which is characterized in that the cover board is equipped with the
One pole and the second pole, the pressure turnover mechanism include short board and rotating sheet, the short board and first pole
Electrical connection, second pole is electrically connected with the cover board, the rotating sheet be set to the lower section of the short board and with it is described
Cover board electrical connection, when inner pressure of lithium ion battery is more than reference pressure, the rotating sheet can overturn and connect with short board
Touching.
7. high sensitivity security protection lithium ion battery as claimed in claim 6, which is characterized in that second pole passes through
Fuse metal piece is connect with the tab of the battery core.
8. high sensitivity security protection lithium ion battery as claimed in claim 7, which is characterized in that the fuse metal piece
Material is lead, antimony, tin or its alloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820838120.2U CN208444887U (en) | 2018-05-31 | 2018-05-31 | A kind of high sensitivity security protection lithium ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820838120.2U CN208444887U (en) | 2018-05-31 | 2018-05-31 | A kind of high sensitivity security protection lithium ion battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208444887U true CN208444887U (en) | 2019-01-29 |
Family
ID=65092740
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201820838120.2U Active CN208444887U (en) | 2018-05-31 | 2018-05-31 | A kind of high sensitivity security protection lithium ion battery |
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| CN (1) | CN208444887U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110261787A (en) * | 2019-07-09 | 2019-09-20 | 哈尔滨工业大学 | A kind of optimum heating power method selected when cylinder ternary lithium ion battery thermal runaway test |
| CN113140837A (en) * | 2020-01-17 | 2021-07-20 | 荣盛盟固利新能源科技有限公司 | High-safety self-destruction lithium ion battery safety device and lithium ion battery |
| CN113829948A (en) * | 2021-08-20 | 2021-12-24 | 合众新能源汽车有限公司 | Lithium ion battery safety assessment method and device and electronic equipment |
| WO2022237068A1 (en) * | 2021-05-11 | 2022-11-17 | 江苏正力新能电池技术有限公司 | Structure for preventing thermal runaway of battery, battery case and battery |
-
2018
- 2018-05-31 CN CN201820838120.2U patent/CN208444887U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110261787A (en) * | 2019-07-09 | 2019-09-20 | 哈尔滨工业大学 | A kind of optimum heating power method selected when cylinder ternary lithium ion battery thermal runaway test |
| CN110261787B (en) * | 2019-07-09 | 2021-04-02 | 哈尔滨工业大学 | Optimal heating power method selected during thermal runaway test of cylindrical ternary lithium ion battery |
| CN113140837A (en) * | 2020-01-17 | 2021-07-20 | 荣盛盟固利新能源科技有限公司 | High-safety self-destruction lithium ion battery safety device and lithium ion battery |
| WO2022237068A1 (en) * | 2021-05-11 | 2022-11-17 | 江苏正力新能电池技术有限公司 | Structure for preventing thermal runaway of battery, battery case and battery |
| CN113829948A (en) * | 2021-08-20 | 2021-12-24 | 合众新能源汽车有限公司 | Lithium ion battery safety assessment method and device and electronic equipment |
| CN113829948B (en) * | 2021-08-20 | 2023-05-12 | 合众新能源汽车股份有限公司 | Lithium ion battery safety assessment method and device and electronic equipment |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 313100, No. 18, Qiao Qiao Road, Changxing County painting industrial park, Zhejiang, Huzhou Patentee after: Tianneng Shuai Fude Energy Co., Ltd Address before: 313100, No. 18, Qiao Qiao Road, Changxing County painting industrial park, Zhejiang, Huzhou Patentee before: Zhejiang energy energy Polytron Technologies Inc |