CN217085218U - High-capacity cylindrical battery cycle life testing system - Google Patents
High-capacity cylindrical battery cycle life testing system Download PDFInfo
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- CN217085218U CN217085218U CN202123216060.1U CN202123216060U CN217085218U CN 217085218 U CN217085218 U CN 217085218U CN 202123216060 U CN202123216060 U CN 202123216060U CN 217085218 U CN217085218 U CN 217085218U
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Abstract
The utility model relates to a battery test technical field, concretely relates to large capacity cylinder battery cycle life test system, including small-scale range test system, current amplification system, electric current minification system and large capacity battery, small-scale range test system's current output end with the current input end electricity of current amplification system is connected, current amplification system's current output end with large capacity battery's current input end electricity is connected, large capacity battery's current output end with the current input end electricity of current minification system is connected, current minification system's current output end with small-scale range test system's current input end electricity is connected, current amplification system to the magnification of electric current with the current minification system equals to the reduction multiple of electric current. The test system has the characteristics of low cost, good safety and capability of accurately testing the cycle life of the large-capacity cylindrical battery.
Description
Technical Field
The utility model relates to a battery test technical field, concretely relates to large capacity cylinder battery cycle life test system.
Background
The lithium ion battery has the advantages of high energy density, good rate capability, high working voltage, no memory effect, long cycle life and the like, and is widely applied to various fields in human production and life. In recent years, the popularization of new energy automobiles greatly increases the demand on cylindrical lithium ion batteries, a typical case is a 18650 small cylindrical battery carried on a Tesla electric automobile, the 18650 small cylindrical battery is a cylindrical battery with the most mature technology, and the Tesla electric automobile has the advantages of high structural standardization degree, good monomer consistency and high yield, so that the Tesla electric automobile is most widely applied. However, 18650 small cylindrical battery capacity is lower, internal resistance is great, and this makes electric automobile power battery system very big to the quantity requirement of monomer cylinder electricity core to increased the complexity of battery package battery management system, and under the inhomogeneous condition of ambient temperature change, monomer cylinder electricity core specificity grow leads to the group battery capacity to exert incompletely, causes the potential safety hazard easily.
At present, the cylindrical battery is developing towards a large size, typical models are 21700, 32131, 34160 and the like, the large-size cylindrical battery has high space utilization rate, low production cost, low requirement on a battery management system, small resistance and good performance, and has great advantages compared with the small-size cylindrical battery. However, since the capacity of the large-sized cylindrical battery is large, taking 20Ah as an example, a 3C charge-discharge cycle requires a large-range device with a range of 60A or more for testing, the cost is high, and a large potential safety hazard exists. The prior art CN113466719A proposes an alternative test method, in which a small-capacity battery test similar to the SOC curve (> 95%) of a large-capacity battery is used to replace the actual test condition of the large-capacity battery, and because the size difference between the large-capacity battery and the small-capacity battery is relatively large, even under the premise of ensuring the consistency of other conditions, the small-capacity battery test is difficult to truly reflect the cycle condition of the actual large-capacity battery.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to prior art not enough, provide a low cost, the security is good and can accurate test large capacity cylinder battery cycle life's test system.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a cycle life test system of a large-capacity cylindrical battery comprises a small-range test system, a current amplification system, a current reduction system and a large-capacity battery, wherein a current output end of the small-range test system is electrically connected with a current input end of the current amplification system, a current output end of the current amplification system is electrically connected with a current input end of the large-capacity battery, a current output end of the large-capacity battery is electrically connected with a current input end of the current reduction system, a current output end of the current reduction system is electrically connected with a current input end of the small-range test system, and the current amplification times of the current amplification system to the current are equal to the current reduction times of the current reduction system to the current.
In the technical scheme, the small-range test system comprises a charge-discharge tester and a computer electrically connected with the charge-discharge tester.
In the above technical solution, the current amplification system and the current reduction system are electrically connected to the computer, and the computer controls the current amplification factor of the current amplification system to be equal to the current reduction factor of the current reduction system.
In the above technical solution, the current amplification system is a voltage follower, and the current reduction system is a reverse follower.
In the technical scheme, the high-capacity battery is placed in the constant-temperature explosion-proof box.
The utility model has the advantages that:
the utility model discloses a test system, after software engineer's programming, the electric current reachs the current amplification system from small-scale test system, enlargies to the required electric current of large capacity battery and flow through the large capacity battery by the current amplification system, then reduces the system by the electric current again and falls to original electric current, so reciprocal circulation, falls to the specified value until the capacity of large capacity battery, and the cycle number during this is the cycle life of large capacity battery promptly. The test system does not need large-scale test equipment, has low cost and good safety, and can accurately test the cycle life of the large-capacity cylindrical battery.
Drawings
Fig. 1 is a schematic diagram of a test system of the present embodiment.
Fig. 2 is a detailed schematic diagram of the test system of the present embodiment.
Reference numerals:
the device comprises a small-range test system 1, a current amplification system 2, a current reduction system 3, a large-capacity battery 4, a charge and discharge tester 5, a computer 6, a voltage follower 7 and a reverse follower 8.
Detailed Description
In order to make the technical problem, technical scheme and beneficial effect that the utility model solved more clearly understand, combine the embodiment below, it is right the utility model discloses further detailed description proceeds. It should be understood, however, that the description herein of specific embodiments is for the purpose of illustration only and is not intended to limit the invention.
Cycle life of the battery: during the charge and discharge cycle of the battery, when the capacity of the battery is reduced to a specified value (generally 80% of the original capacity, which can be specifically selected according to the actual application), the number of cycles in the period is the cycle life.
The cycle life testing system of the large-capacity cylindrical battery in the embodiment is shown in fig. 1 and comprises a small-range testing system 1, a current amplifying system 2, a current reducing system 3 and a large-capacity battery 4, wherein a current output end of the small-range testing system 1 is electrically connected with a current input end of the current amplifying system 2, a current output end of the current amplifying system 2 is electrically connected with a current input end of the large-capacity battery 4, a current output end of the large-capacity battery 4 is electrically connected with a current input end of the current reducing system 3, a current output end of the current reducing system 3 is electrically connected with a current input end of the small-range testing system 1, and the current amplifying times of the current amplifying system 2 are equal to the current reducing times of the current reducing system 3. In the embodiment, the current amplification system 2 and the current reduction system 3 are arranged between the small-scale test system and the large-capacity battery, so that the amplified current flows through the large-capacity battery 4 and then the current is reduced to the initial value and returned to the small-scale test system 1, the cycle is repeated until the capacity of the large-capacity battery 4 is reduced to the specified value, and the cycle number in the period is the cycle life of the large-capacity battery 4. The test system does not need large-scale test equipment, has low cost and good safety, and can accurately test the cycle life of the large-capacity cylindrical battery.
In order to further ensure the accuracy of the test and avoid the influence of the temperature change on the test result, the large-capacity battery 4 of the embodiment is placed in the constant-temperature explosion-proof box for testing.
Specifically, the small-scale test system 1 of the present embodiment includes a charge and discharge tester 5 and a computer 6 electrically connected to the charge and discharge tester, the current amplification system 2 and the current reduction system 3 are both electrically connected to the computer 6, the current amplification system 2 is a voltage follower 7, and the current reduction system 3 is a reverse follower 8. As shown in fig. 2, after being programmed by a software engineer, the voltage follower 7, the reverse follower 8, and the charge and discharge tester 5 are all electrically connected to the computer 6, parameters such as current, capacity, voltage, and charge and discharge time are set on the computer 6, then the charge and discharge tester 5, the voltage follower 7, the large-capacity battery 4, the reverse follower 8, and the charge and discharge tester 5 are electrically connected in sequence, and then the test is started, and the cycle number is the cycle life of the large-capacity battery 4 when the capacity is reduced to a specified value.
In the above, the manner that the computer 6 changes the currents of the voltage follower 7 and the reverse follower 8 is implemented by changing the resistance of the follower feedback resistor, wherein the resistance electric control technology of the resistor belongs to the prior art, for example, the electric control of the resistance can be adjusted by controlling the access of the resistors with different resistances through a switch, or other existing manners are adopted, which is not described herein again.
The charging and discharging tester 5, the voltage follower 7 and the reverse follower 8 used in this embodiment are all common products on the market, for example, the charging and discharging tester 5 may be a common tester with a model number DCLT-4805 on the market.
It should be finally noted that the above embodiments are only intended to illustrate the technical solutions of the present invention, and not to limit the scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present invention can be modified or replaced with equivalents without departing from the spirit and scope of the technical solutions of the present invention.
Claims (5)
1. The utility model provides a large capacity cylinder battery cycle life test system which characterized in that: the current output end of the small-scale test system is electrically connected with the current input end of the current amplification system, the current output end of the current amplification system is electrically connected with the current input end of the large-capacity battery, the current output end of the large-capacity battery is electrically connected with the current input end of the current reduction system, the current output end of the current reduction system is electrically connected with the current input end of the small-scale test system, and the current amplification times of the current amplification system are equal to the current reduction times of the current reduction system.
2. The cycle life test system of the large-capacity cylindrical battery as claimed in claim 1, wherein: the small-range test system comprises a charge-discharge tester and a computer electrically connected with the charge-discharge tester.
3. The cycle life test system of the large-capacity cylindrical battery as claimed in claim 2, wherein: the current amplification system and the current reduction system are electrically connected with the computer, and the computer controls the current amplification times of the current amplification system to be equal to the current reduction times of the current reduction system.
4. The cycle life test system of the large-capacity cylindrical battery as claimed in claim 1, wherein: the current amplification system is a voltage follower, and the current reduction system is an inverse follower.
5. The cycle life test system of the large-capacity cylindrical battery as claimed in claim 1, wherein: the high-capacity battery is placed in the constant-temperature explosion-proof box.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123216060.1U CN217085218U (en) | 2021-12-17 | 2021-12-17 | High-capacity cylindrical battery cycle life testing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123216060.1U CN217085218U (en) | 2021-12-17 | 2021-12-17 | High-capacity cylindrical battery cycle life testing system |
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| Publication Number | Publication Date |
|---|---|
| CN217085218U true CN217085218U (en) | 2022-07-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202123216060.1U Active CN217085218U (en) | 2021-12-17 | 2021-12-17 | High-capacity cylindrical battery cycle life testing system |
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| CN (1) | CN217085218U (en) |
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2021
- 2021-12-17 CN CN202123216060.1U patent/CN217085218U/en active Active
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