CN210640334U - Soft package lithium ion battery organizes overcurrent protection device - Google Patents
Soft package lithium ion battery organizes overcurrent protection device Download PDFInfo
- Publication number
- CN210640334U CN210640334U CN201921417381.8U CN201921417381U CN210640334U CN 210640334 U CN210640334 U CN 210640334U CN 201921417381 U CN201921417381 U CN 201921417381U CN 210640334 U CN210640334 U CN 210640334U
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- Prior art keywords
- lithium ion
- ion battery
- battery pack
- charging
- protection device
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 96
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 96
- 230000007246 mechanism Effects 0.000 claims abstract description 18
- 238000007599 discharging Methods 0.000 claims abstract description 12
- 230000002457 bidirectional effect Effects 0.000 claims description 3
- 238000007086 side reaction Methods 0.000 abstract description 4
- 238000001514 detection method Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000001960 triggered effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
Images
Classifications
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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
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- Battery Mounting, Suspending (AREA)
- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The utility model discloses a soft package lithium ion battery pack overcurrent protection device, which belongs to the field of lithium ion batteries, and has the technical scheme that the soft package lithium ion battery pack overcurrent protection device comprises a shell and a lithium ion battery pack formed by connecting a plurality of lithium ion batteries in series, wherein the lithium ion battery pack is arranged inside the shell, and the soft package lithium ion battery pack overcurrent protection device also comprises a control circuit board which is arranged inside the shell and is electrically connected with the lithium ion battery pack; the control circuit board comprises a protection chip and a charging control switch, the charging control switch is connected in series in a charging and discharging main circuit of the lithium ion battery pack, and the protection chip is connected in parallel with the charging control switch to control the on and off of the charging control switch; and the shunt mechanism is connected with the single lithium ion battery in parallel, and the triggering shunt voltage of the shunt mechanism is greater than the rated voltage of the single lithium ion battery. The problem that when a single lithium ion battery is charged to a voltage exceeding a rated voltage, chemical side reactions of the battery are intensified, and the battery is damaged or the safety problem is solved.
Description
Technical Field
The utility model relates to a lithium ion battery technical field particularly, relates to a soft packet of lithium ion battery organizes overcurrent protection device.
Background
The soft package battery has the advantages of small volume, light weight, high specific energy, relatively flexible design and the like, and is favored by vast power battery manufacturers. The power device of the electric automobile is a lithium ion battery pack with high power and large capacity formed by connecting a plurality of single lithium ion batteries in series and in parallel.
When the battery pack is charged, the single lithium ion batteries are respectively charged, so that when the battery pack is completely charged, the single lithium ion battery which is small in capacity and can be charged fastest easily generates an overcharge phenomenon, chemical side reactions of the lithium ion battery pack are aggravated, and the battery can be damaged or the safety problem can be caused.
Therefore, the soft package lithium ion battery pack overcurrent protection device is provided.
Disclosure of Invention
A primary object of the present invention is to provide a soft-packaged lithium ion battery overcurrent protection device to solve the problems in the above background art.
In order to achieve the above object, the utility model provides a soft-package lithium ion battery pack overcurrent protection device, which comprises a shell and a lithium ion battery pack formed by a plurality of lithium ion batteries connected in series, wherein the lithium ion battery pack is arranged inside the shell, and the soft-package lithium ion battery pack overcurrent protection device also comprises a control circuit board which is arranged inside the shell and is electrically connected with the lithium ion battery pack; the control circuit board comprises a protection chip and a charging control switch, the charging control switch is connected in series in a charging and discharging main circuit of the lithium ion battery pack, and the protection chip is connected in parallel with the charging control switch to control the on and off of the charging control switch; the shunt mechanism is connected with the single lithium ion battery in parallel, the trigger shunt voltage of the shunt mechanism is greater than the rated voltage of the single lithium ion battery, and the trigger shunt voltage is greater than the rated voltage of the single lithium ion battery by 0.2V.
Further, the control circuit board further comprises a positive thermistor, and the positive thermistor is electrically connected with the protection chip and is communicated with a charging and discharging main circuit.
Further, the control circuit board further comprises a negative thermistor, and the negative thermistor is electrically connected with the protection chip and is communicated with a charging and discharging main circuit.
Further, the protection chip is a multi-section lithium ion battery protection IC.
Further, the shunt mechanism is a bidirectional trigger diode.
Further, the charge control switch is a MOS switch.
Use the technical scheme of the utility model, beneficial effect is: this kind of soft packet of lithium ion battery organizes overcurrent protection device can shunt corresponding single lithium ion battery through reposition of redundant personnel mechanism to the realization keeps the effect of single lithium ion battery voltage maintenance at rated voltage, solved single lithium ion battery voltage and charged when exceeding rated voltage, the chemical side reaction of battery will aggravate, can lead to the battery to damage or the safety problem appears, reposition of redundant personnel mechanism is with low costs moreover, soft packet of lithium ion battery organizes overcurrent protection device's manufacturing cost has been reduced effectively.
Drawings
The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 shows an overall structure of the present invention;
fig. 2 shows a structure view of the inside of the case of the present invention;
fig. 3 shows a lithium ion battery pack charging circuit diagram of the present invention;
fig. 4 shows a charging overcurrent protection circuit diagram of the present invention;
fig. 5 shows a lithium ion battery pack protection and keep-away diagram of the present invention.
Wherein the figures include the following reference numerals:
10. a housing; 20. a control circuit board; 21. protecting the chip; 22. a charge control switch; 23. a positive thermistor; 24. a negative thermistor; 30. a lithium ion battery pack; 40. a flow dividing mechanism.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
As shown in fig. 1 to 5, the utility model provides a soft-package lithium ion battery pack overcurrent protection device, which comprises a casing 10 and a lithium ion battery pack 30 formed by a plurality of lithium ion batteries connected in series, wherein the lithium ion battery pack 30 is arranged inside the casing 10, and the soft-package lithium ion battery pack overcurrent protection device further comprises a control circuit board 20, and the control circuit board 20 is arranged inside the casing 10 and is electrically connected with the lithium ion battery pack 30; the control circuit board 20 comprises a protection chip 21 and a charging control switch 22, the charging control switch is connected in series in a charging and discharging main circuit of the lithium ion battery pack 30, and the protection chip 21 is connected in parallel with the charging control switch 22 to control the on and off of the charging control switch 22; the shunt mechanism 40 is connected with the single lithium ion battery in parallel, and the trigger shunt voltage of the shunt mechanism 40 is greater than the rated voltage of the single lithium ion battery, wherein the trigger shunt voltage exceeds the rated voltage of the single lithium ion battery by 0.2V.
By applying the technical scheme of the embodiment, the charging mode required by the lithium ion battery is constant current/constant voltage, the lithium ion battery is charged with the constant current at the initial charging stage, the voltage can rise to the rated voltage of the lithium ion battery along with the charging process, namely, the lithium ion battery is charged with the constant voltage until the current is smaller and smaller, the voltage at two ends of the lithium ion battery continues to rise to exceed the rated voltage of the lithium ion battery by +0.2V when the lithium ion battery is charged and overcharged, at the moment, the trigger shunt voltage of the shunt mechanism 40 is reached, so that the shunt mechanism 40 can shunt the corresponding single lithium ion battery, the effect of maintaining the voltage of the single lithium ion battery at the rated voltage is realized, and the problem that when the voltage of the single lithium ion battery is charged to exceed the rated voltage, the chemical side reaction of the battery is;
when the lithium ion battery pack 30 finishes charging, when the voltage of the lithium ion battery pack 30 is higher than the overcharge detection voltage and the state lasts for the overcharge detection delay time, the control circuit of the protection chip 21 outputs a low level, the charge control switch 22 is turned off, and charging is forbidden;
when discharging, the lithium ion battery outputs current, and the trigger shunt voltage is higher than the rated voltage of the lithium ion battery, so that shunt cannot be triggered.
Specifically, the protection chip 21 is a multi-section lithium ion battery protection IC, and its model number is HM 8254-AAK.
Alternatively, the charge control switch 22 is a MOS switch.
As shown in fig. 5, the control circuit board 20 further includes a positive thermistor 23, the positive thermistor 23 is electrically connected to the protection chip 21 and is connected to the main charging and discharging circuit, when the temperature inside the lithium ion battery pack 30 is too high, the resistance of the positive thermistor 23 is rapidly increased, so that the current change in the circuit is fed back to the protection chip 21, the protection chip 21 synchronously turns off the charging control switch 22 to stop charging, and after the temperature inside the lithium ion battery pack 30 is reduced, the resistance of the positive thermistor 23 is recovered, so that the protection chip 21 synchronously turns on the charging control switch 22 to perform charging, thereby effectively avoiding the problem of burning of the lithium ion battery pack 30 due to high temperature during the charging process.
As shown in fig. 5, the control circuit board 20 further includes a negative thermistor 24, the negative thermistor 24 is electrically connected to the protection chip 21 and is connected to the charging and discharging main circuit, when the temperature inside the lithium ion battery pack 30 is too low, the resistance of the negative thermistor 24 is rapidly increased, so that the current change in the circuit is fed back to the protection chip 21, the protection chip 21 synchronously turns off the charging control switch 22 to stop charging, after the temperature inside the lithium ion battery pack 30 is raised, the resistance of the negative thermistor 24 is recovered, so that the protection chip 21 synchronously turns on the charging control switch 22 to perform charging, thereby effectively avoiding the problem of damage to the lithium ion battery pack 30 caused by too low temperature during the charging process.
The shunt mechanism 40 is a bidirectional trigger diode, which can reduce the production cost of the overcurrent protection device.
From the above description, it can be seen that the specific using method and operation principle of the above-mentioned embodiments of the present invention are as follows: firstly, when the lithium ion battery is charged and overcharged, the voltage at two ends of the lithium ion battery continuously rises to exceed the rated voltage of the lithium ion battery by +0.2V, at the moment, the triggering shunt voltage of the shunt mechanism 40 is reached, so that the shunt mechanism 40 can shunt corresponding single lithium ion battery, then, when the lithium ion battery pack 30 finishes charging, when the voltage of the lithium ion battery pack 30 is higher than the overcharge detection voltage and the state lasts for the overcharge detection delay time, the protection chip 21 control circuit outputs a low level, the charge control switch 22 is turned off, charging is forbidden, and then, when discharging is carried out, the lithium ion battery outputs current, and the triggering shunt voltage is higher than the rated voltage of the lithium ion battery, so that shunt cannot be triggered.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. The utility model provides a soft packet of lithium ion battery organizes overcurrent protection device, includes lithium ion battery group (30) that casing (10) and a plurality of lithium ion battery establish ties and constitute, lithium ion battery group (30) set up the inside at casing (10), its characterized in that: also comprises
The control circuit board (20), the said control circuit board (20) is set up in the inside of the body (10) and electrically connected with lithium ion battery pack (30);
the control circuit board (20) comprises a protection chip (21) and a charging control switch (22), the charging control switch is connected in series in a charging and discharging main circuit of the lithium ion battery pack (30), and the protection chip (21) is connected in parallel with the charging control switch (22) to control the on and off of the charging control switch (22);
the shunt mechanism (40) is connected with the single lithium ion battery in parallel, and the trigger shunt voltage of the shunt mechanism (40) is greater than the rated voltage of the single lithium ion battery;
and the trigger shunt voltage exceeds the rated voltage of a single lithium ion battery by 0.2V.
2. The over-current protection device of the soft package lithium ion battery pack according to claim 1, characterized in that: the control circuit board (20) further comprises a positive thermistor (23), and the positive thermistor (23) is electrically connected with the protection chip (21) and is communicated with a charging and discharging main circuit.
3. The over-current protection device of the soft package lithium ion battery pack according to claim 1, characterized in that: the control circuit board (20) further comprises a negative thermistor (24), and the negative thermistor (24) is electrically connected with the protection chip (21) and is communicated with a charging and discharging main circuit.
4. The over-current protection device of the soft-package lithium ion battery pack according to any one of claims 1 to 3, characterized in that: the protection chip (21) is a multi-section lithium ion battery protection IC.
5. The over-current protection device of the soft package lithium ion battery pack according to claim 1, characterized in that: the shunt mechanism (40) is a bidirectional trigger diode.
6. The over-current protection device of the soft package lithium ion battery pack according to claim 1, characterized in that: the charging control switch (22) is an MOS switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921417381.8U CN210640334U (en) | 2019-08-29 | 2019-08-29 | Soft package lithium ion battery organizes overcurrent protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921417381.8U CN210640334U (en) | 2019-08-29 | 2019-08-29 | Soft package lithium ion battery organizes overcurrent protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210640334U true CN210640334U (en) | 2020-05-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921417381.8U Active CN210640334U (en) | 2019-08-29 | 2019-08-29 | Soft package lithium ion battery organizes overcurrent protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210640334U (en) |
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2019
- 2019-08-29 CN CN201921417381.8U patent/CN210640334U/en active Active
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Effective date of registration: 20231226 Granted publication date: 20200529 |
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