CN110987210A - Method for detecting internal temperature of lithium ion battery - Google Patents
Method for detecting internal temperature of lithium ion battery Download PDFInfo
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- CN110987210A CN110987210A CN201911069447.3A CN201911069447A CN110987210A CN 110987210 A CN110987210 A CN 110987210A CN 201911069447 A CN201911069447 A CN 201911069447A CN 110987210 A CN110987210 A CN 110987210A
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- temperature
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/02—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/14—Supports; Fastening devices; Arrangements for mounting thermometers in particular locations
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
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Abstract
The invention discloses a method for detecting the internal temperature of a lithium ion battery, which comprises the following steps: firstly, fixing a plurality of temperature probes (5) at preset positions inside a battery 2, wherein each temperature probe (5) is connected with an external temperature recorder (1) through a temperature line (4); and step two, acquiring temperature data of a preset position inside the battery in real time through the external temperature recorder (1), and detecting the temperature inside the battery. The method for detecting the internal temperature of the lithium ion battery can timely and reliably acquire the real temperature of the battery, and has important popularization significance.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a method for detecting the internal temperature of a lithium ion battery.
Background
In the process of charging and discharging of the power battery, a plurality of chemical heat generation processes are formed due to the complex electrochemical reaction inside the power battery, and meanwhile, the physical heat generation processes brought by some impedances are accompanied, and the heat directly influences the cycle life, safety and other important performances of the battery. With the increasing market demand for high power density, low cost, high capacity, fast charge, and other battery products, thermal management of batteries has also become critical.
Currently, real-time monitoring of battery temperature is mostly limited to surface temperature, and the heat distribution of a battery cell is presumed according to the battery surface temperature and serves as an important basis for thermal management of a battery pack.
Therefore, there is an urgent need to develop a technology capable of timely and reliably acquiring the true temperature inside the battery.
Disclosure of Invention
The invention aims to provide a method for detecting the internal temperature of a lithium ion battery, aiming at the technical defects in the prior art.
Therefore, the invention provides a method for detecting the internal temperature of a lithium ion battery, which comprises the following steps:
fixing a plurality of temperature measuring probes at preset positions in a battery, wherein each temperature measuring probe is connected with an external temperature recorder through a temperature line;
and step two, acquiring temperature data of a preset position inside the battery in real time through an external temperature recorder, and detecting the temperature inside the battery.
Wherein, in the first step, the battery comprises a hollow battery case;
the battery shell is internally provided with a plurality of core packages which are arranged in parallel;
the lug on the top of the core bag is connected with the battery cover;
the battery cover is provided with a liquid injection hole;
the temperature measuring probe and the temperature line penetrate through the liquid injection hole on the battery cover and extend into the battery core shell.
Each temperature line and each temperature probe extending into the battery are bonded and fixed with preset different positions on the surface of the core bag through the high-viscosity high-temperature-resistant adhesive tape.
The plurality of temperature lines positioned in the battery are mutually distributed in a non-overlapping and staggered manner.
Wherein, after the temperature line passed the notes liquid hole on the battery cover and stretched into the cell shell inside, adopt to annotate liquid hole rubber buffer extrusion and fill in annotating the liquid hole, realize preliminary sealing through the extrusion deformation with annotating the liquid hole rubber buffer, directly make the temperature line fixed, then reuse battery sealant to carry out double sealing and solidification processing.
Wherein, the surface of the temperature measuring probe is wrapped with a layer of high temperature resistant insulating adhesive tape.
Compared with the prior art, the method for detecting the internal temperature of the lithium ion battery can timely and reliably obtain the real temperature of the battery, and has important popularization significance.
Drawings
Fig. 1 is a flowchart of a method for detecting an internal temperature of a lithium ion battery according to the present invention;
fig. 2 is a schematic diagram of external connection between an external temperature recorder and a battery in the method for detecting the internal temperature of the lithium ion battery according to the present invention;
FIG. 3 is a schematic diagram illustrating the distribution of temperature measuring elements inside a lithium ion battery according to the method for detecting the internal temperature of the lithium ion battery of the present invention;
fig. 4 is a side cross-sectional view of a lithium ion battery according to a method for detecting an internal temperature of the lithium ion battery provided by the present invention;
fig. 5 is a top view of a battery cover of a lithium ion battery in the method for detecting the internal temperature of the lithium ion battery according to the present invention.
In the figure: 1. an external temperature recorder; 2. a battery; 3. a liquid injection hole; 4. a temperature profile; 5. a temperature measuring probe;
6. a core package; 7. a liquid injection hole rubber plug; 8. a battery case; 9. a tab; 10. a battery cover.
Detailed Description
In order that those skilled in the art will better understand the technical solution of the present invention, the following detailed description of the present invention is provided in conjunction with the accompanying drawings and embodiments.
Referring to fig. 1 to 5, the present invention provides a method for detecting an internal temperature of a lithium ion battery, including the steps of:
firstly, fixing a plurality of temperature probes 5 at preset positions inside a battery 2, wherein each temperature probe 5 is connected with an external temperature recorder 1 through a temperature line 4;
and step two, acquiring temperature data of a preset position inside the battery in real time through the external temperature recorder 1, and detecting the temperature inside the battery.
In the present invention, in a first step, as shown in fig. 2, the battery 2 includes a hollow battery case 8;
the battery case 8 has a plurality of core packs 6 arranged in parallel therein;
the lug arranged at the top of the core bag 6 is connected with the battery cover 10;
the battery cover 10 is provided with a liquid injection hole 3;
the temperature measuring probe 5 and the temperature wire 4 penetrate through the liquid injection hole 3 on the battery cover 10 and extend into the electric core shell 8.
The battery 2 includes a battery lid 10, a battery case 8, a core pack 6, and an electrolyte. Each core package 6 is composed of a positive plate, a negative plate and a diaphragm in a winding or laminating mode; the pole piece is connected with the battery pole through a pole ear 9.
In the first step, in the concrete realization, stretch into every temperature line 4 and every temperature probe 5 of battery 2 inside, through high viscosity high temperature resistant sticky tape, bond fixedly with presetting different positions on core package 6 surface.
It should be noted that different preset positions on the surface of the core pack 6 can be arbitrarily set according to the needs of the user. The coordinate positions of the temperature measuring points for installing the temperature measuring probe 5 include, but are not limited to, the middle or inside of the core package, the positions of the tabs, and the positions between the core package and the battery case, and the number of the temperature measuring points can be determined according to actual requirements.
In particular, the plurality of temperature lines 4 located inside the battery 2 are arranged in a non-overlapping and staggered manner.
Referring to fig. 3, after the temperature lines 4 and the temperature probes 5 extend to the temperature measuring plane on the core package 6, the core package 6 is covered and fixed with a high-viscosity high-temperature-resistant adhesive tape, and in order to prevent the overlapping of the temperature lines to cause thickness overlapping, the core package 6 needs to be shunted and fixed.
It should be noted that, referring to fig. 4, fig. 4 is a side sectional view of a battery, in a specific implementation, in the same temperature measurement plane, temperature lines are not overlapped, each layer of temperature measurement line can be thickened by less than or equal to 0.5mm, a temperature measurement area for installing the temperature measurement probe 5 includes, but is not limited to, core packages, and temperature measurement positions and the number of temperature measurement points can be appropriately adjusted according to requirements. In the concrete implementation, before the core package (i.e. the electric core) enters the shell, different temperature measuring point positions of the core package and different wires (i.e. temperature lines) need to be in one-to-one correspondence through different numbers. After the temperature measuring position of the battery core corresponds to the wire number, the core package continues to carry out subsequent battery preparation procedures of shell sealing, drying, liquid injection activation, exhaust and the like in the existing battery production process.
In the first step, the temperature measuring probe 5, as a built-in temperature measuring element, is an ultra-fine thermocouple temperature measuring element which is subjected to insulation treatment.
In the concrete implementation, the temperature probe 5 is a thermocouple temperature measuring element, and the surface of the temperature probe 5 is wrapped with a layer of high-temperature insulating adhesive tape. The invention is characterized in that the surface of the temperature measuring element which already contains the insulating film is continuously wrapped with a layer of high-temperature-resistant insulating adhesive tape so as to achieve double-layer insulation protection.
It should be noted that the temperature probe 5 is a thermocouple temperature measuring element, has insulating, high temperature resistant and electrolyte resistant properties, and theoretically can realize temperature detection in the range of-30 ℃ to 1000 ℃, and the test principle is based on the thermoelectric effect, and the temperature output is realized by the potential difference signal generated at the two ends of the two metal materials according to the change of the temperature.
In the first step, in the concrete implementation, as shown in fig. 5, fig. 5 is a top view of the battery cover, after the temperature line 4 passes through the liquid injection hole 3 on the battery cover 10 and extends into the electric core shell 8, the liquid injection hole rubber plug 7 can be squeezed and plugged into the liquid injection hole 3, preliminary sealing is realized by squeezing deformation of the liquid injection hole rubber plug 7 until the compression amount of the liquid injection hole rubber plug 7 is enough to fix the temperature line, and then the battery sealant is used for double sealing and curing treatment.
The battery filling hole is sealed by adopting an elastically deformable rubber sealing rubber plug and a battery sealant for double sealing treatment, and after sealing, the battery core can be transferred to the formation and aging processes of the existing battery.
It should be noted that the liquid injection hole rubber plug 7 is an elastically deformable rubber plug, the height of which is at least 4mm (for example, the height of the hard rubber plug can be increased properly), and when the number of temperature lines is small and the diameter of the liquid injection hole allows, the temperature line 4 can pass through the liquid injection hole rubber plug 7; when the quantity is more, the temperature lines can be concentrated on one side of the liquid injection hole, then the rubber sealing plug is plugged in, and finally the battery sealant is used for multiple curing and sealing treatment.
In the invention, the external temperature recorder is a multi-signal acquisition device capable of performing cold end compensation.
It should be noted that, the external temperature recorder 1 is connected to the temperature line, and then the temperature is measured online by using a computer, and the host computer can simultaneously measure 40 temperature points, and the configuration of 60 temperature points can be realized at most.
In the present invention, the external thermometer 1 may be a thermometer with a mature technology, for example, a temperature collector manufactured by Nissan (Shanghai) commerce and trade company, model number MR8875-30, may be used. The temperature measuring probe 5 is a temperature collecting probe matched with the temperature collector.
It should be noted that, for the invention, the electric core (core package) to be tested is taken as a carrier, the built-in temperature measuring element (temperature measuring probe) and the external temperature recorder are taken as main temperature measuring devices, the built-in temperature measuring element extends into the middle of the core package or the inner part of the single core package from the liquid injection hole of the battery cover, and the like, and is fixedly bonded according to the coordinate position of a temperature measuring point, after the temperature measuring position of the electric core corresponds to the wire number, the core package is transferred to the shell for sealing, and is dried, liquid injection activation, air exhaust and the like for subsequent preparation, and the temperature of the core package can.
Compared with the prior art, the invention has the following beneficial technical effects:
1. the contact type temperature measuring element with higher measuring precision is adopted, the structure is simple, the operation is flexible, and the temperature detection of a plurality of positions can be realized;
2. the temperature of the inner part and the outer part of the battery under different conditions (temperature, charge state, current and the like) can be monitored, the temperature control of the battery cell can be realized, the reasonable application of the battery can be carried out in a targeted manner, and data support is provided for the optimal design of thermal simulation and the module heat dissipation mode.
In summary, compared with the prior art, the method for detecting the internal temperature of the lithium ion battery provided by the invention can timely and reliably obtain the real temperature of the battery, and has important popularization significance.
It should be understood that the present invention is not limited to the above embodiments, and may be in other forms. For example, the number of the battery pole groups is not limited to 4, and may be 2 or more than 2. For another example, the positions and the number of the temperature measurement points are not limited to the above embodiments, and can be changed appropriately according to actual requirements. For another example, when the number of temperature lines is large and the diameter of the liquid injection hole is small, the rubber sealing plug can be properly cancelled, and the battery sealant is adopted for multiple curing and sealing treatments.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (6)
1. A method for detecting the internal temperature of a lithium ion battery is characterized by comprising the following steps:
firstly, fixing a plurality of temperature probes (5) at preset positions inside a battery 2, wherein each temperature probe (5) is connected with an external temperature recorder (1) through a temperature line (4);
and step two, acquiring temperature data of a preset position inside the battery in real time through the external temperature recorder (1), and detecting the temperature inside the battery.
2. The detection method according to claim 1, wherein in the first step, the battery (2) comprises a hollow battery case (8);
the battery case (8) is internally provided with a plurality of core packages (6) which are arranged in parallel;
the top of the core bag (6) is provided with a lug which is connected with the battery cover (10);
the battery cover (10) is provided with a liquid injection hole (3);
the temperature measuring probe (5) and the temperature line (4) penetrate through the liquid injection hole (3) on the battery cover (10) and extend into the electric core shell (8).
3. The detection method according to claim 2, wherein each temperature line (4) and each temperature probe (5) extending into the battery (2) are fixed to the surface of the core pack (6) at different predetermined positions by high-viscosity high-temperature-resistant adhesive tapes.
4. The detection method according to claim 3, wherein the plurality of temperature lines (4) located inside the battery (2) are arranged in a non-overlapping, staggered manner.
5. The detecting method according to claim 2, wherein after the temperature line (4) is passed through the liquid injecting hole (3) in the battery cover (10) and is extended into the interior of the battery cell case (8), the liquid injecting hole rubber stopper (7) is pressed and inserted into the liquid injecting hole (3), the preliminary sealing is effected by the pressing deformation of the liquid injecting hole rubber stopper (7) until the temperature line is fixed, and then the battery sealant is used for the double sealing and curing treatment.
6. The detection method according to any one of claims 1 to 5, wherein the surface of the temperature probe (5) is coated with a layer of high temperature resistant insulating tape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911069447.3A CN110987210A (en) | 2019-11-05 | 2019-11-05 | Method for detecting internal temperature of lithium ion battery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911069447.3A CN110987210A (en) | 2019-11-05 | 2019-11-05 | Method for detecting internal temperature of lithium ion battery |
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| CN110987210A true CN110987210A (en) | 2020-04-10 |
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| CN201911069447.3A Pending CN110987210A (en) | 2019-11-05 | 2019-11-05 | Method for detecting internal temperature of lithium ion battery |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112162202A (en) * | 2020-09-14 | 2021-01-01 | 欣旺达电动汽车电池有限公司 | Battery internal temperature detection method, system, device and storage medium |
| CN112433166A (en) * | 2020-11-22 | 2021-03-02 | 同济大学 | Multi-dimensional detection method and structure for internal failure reaction of lithium ion power battery |
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| CN203432696U (en) * | 2013-07-19 | 2014-02-12 | 天津力神电池股份有限公司 | Lithium ion battery temperature test tructure |
| CN204167442U (en) * | 2014-11-20 | 2015-02-18 | 深圳出入境检验检疫局工业品检测技术中心 | Lithium battery group temperature monitoring system |
| CN206758597U (en) * | 2017-02-21 | 2017-12-15 | 山东玉皇新能源科技有限公司 | Aluminum-shell battery based on measurable internal temperature of battery device |
| CN209389072U (en) * | 2019-01-17 | 2019-09-13 | 合肥国轩高科动力能源有限公司 | A kind of lithium ion square power battery end cap of detectable interior temperature |
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2019
- 2019-11-05 CN CN201911069447.3A patent/CN110987210A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN203432696U (en) * | 2013-07-19 | 2014-02-12 | 天津力神电池股份有限公司 | Lithium ion battery temperature test tructure |
| CN204167442U (en) * | 2014-11-20 | 2015-02-18 | 深圳出入境检验检疫局工业品检测技术中心 | Lithium battery group temperature monitoring system |
| CN206758597U (en) * | 2017-02-21 | 2017-12-15 | 山东玉皇新能源科技有限公司 | Aluminum-shell battery based on measurable internal temperature of battery device |
| CN209389072U (en) * | 2019-01-17 | 2019-09-13 | 合肥国轩高科动力能源有限公司 | A kind of lithium ion square power battery end cap of detectable interior temperature |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112162202A (en) * | 2020-09-14 | 2021-01-01 | 欣旺达电动汽车电池有限公司 | Battery internal temperature detection method, system, device and storage medium |
| CN112162202B (en) * | 2020-09-14 | 2024-02-20 | 欣旺达动力科技股份有限公司 | Method, system, device and storage medium for detecting internal temperature of battery |
| CN112433166A (en) * | 2020-11-22 | 2021-03-02 | 同济大学 | Multi-dimensional detection method and structure for internal failure reaction of lithium ion power battery |
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Application publication date: 20200410 |