CN214069561U - Battery steady state protection circuit - Google Patents
Battery steady state protection circuit Download PDFInfo
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- CN214069561U CN214069561U CN202023170063.1U CN202023170063U CN214069561U CN 214069561 U CN214069561 U CN 214069561U CN 202023170063 U CN202023170063 U CN 202023170063U CN 214069561 U CN214069561 U CN 214069561U
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- Prior art keywords
- charging
- protection module
- protection
- battery
- charge
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- 238000007599 discharging Methods 0.000 claims abstract description 28
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 8
- 229910052744 lithium Inorganic materials 0.000 claims description 8
- 238000001514 detection method Methods 0.000 claims description 6
- 230000005669 field effect Effects 0.000 claims description 5
- 238000000034 method Methods 0.000 abstract description 11
- 238000010586 diagram Methods 0.000 description 6
- 230000000903 blocking effect Effects 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
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- Battery Mounting, Suspending (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
The utility model discloses a battery steady state protection circuit, the circuit includes battery pack, overcharge protection module, one-time charge-discharge protection module and secondary charge protection module; the circuit is provided with a positive electrode charging and discharging interface, the overcharge protection module is connected with the positive electrode charging and discharging interface, and the overcharge protection module is connected with the secondary charging protection module; the primary charging and discharging protection module is connected with the secondary charging protection module, and the secondary charging protection module is connected with the battery pack. The embodiment of the utility model provides a can realize the basic protect function of battery pack in charge-discharge process, and further ensure battery pack's security performance to improve battery pack's life.
Description
Technical Field
The utility model relates to a battery protection technology field especially relates to a battery steady state protection circuit.
Background
The lithium ion battery has high energy density, so that in an overcharged state, after the temperature of the battery rises, the energy is excessive, the internal electrolyte is decomposed to generate gas, and the internal pressure rises to cause the danger of rupture; on the contrary, in the over-discharged state, the electrolyte is decomposed to deteriorate the battery characteristics, and the number of times of charging is reduced. The existing battery protection circuit has a basic protection function for the battery charging and discharging process, and the battery charging process is not additionally restricted, so that the safety performance of the battery cannot be further guaranteed.
Disclosure of Invention
The utility model aims to overcome the not enough of prior art, the utility model provides a battery steady state protection circuit can realize the basic protect function of battery pack at the charge-discharge in-process, and further ensures battery pack's security performance to improve battery pack's life.
Correspondingly, the utility model provides a battery steady state protection circuit, the circuit includes battery pack, overcharge protection module, once charge-discharge protection module and secondary charge protection module;
the circuit is provided with a positive electrode charging and discharging interface, the overcharge protection module is connected with the positive electrode charging and discharging interface, and the overcharge protection module is connected with the secondary charging protection module; the primary charging and discharging protection module is connected with the secondary charging protection module, and the secondary charging protection module is connected with the battery pack.
In an optional implementation manner, the primary charge and discharge protection module includes a charge and discharge switch controller group and a charge and discharge protection controller, a control end of the charge and discharge switch controller group is connected to a control end of the charge and discharge protection controller, and a detection end of the charge and discharge protection controller is connected to the secondary charge protection module.
In an optional embodiment, the charge and discharge protection controller comprises a lithium battery protection chip with a model number of S-8242 AAX.
In an optional implementation manner, the charge and discharge switch controller group includes two power switch tubes, and the two power switch tubes are connected in parallel.
In an alternative embodiment, each of the two power switches is a field effect transistor model CJS 8810.
In an optional embodiment, the secondary charging protection module includes two battery cell charging detectors, each of the two battery cell charging detectors is connected to the detection end of the charging and discharging protection controller, and each of the two battery cell charging detectors is connected to the battery assembly.
In an optional embodiment, each of the two cell charge detectors includes a lithium battery protection chip of model S-8241 GCL.
In an alternative embodiment, the overcharge protection module includes a PTC thermistor.
In the embodiment of the utility model, the basic protection function of the battery component in the charging and discharging process can be realized by arranging the one-time charging and discharging protection module; the secondary charging protection module is arranged to realize stable regulation and control of the internal voltage of the battery pack, so that the safety performance of the battery pack is further guaranteed, and the service life of the battery pack is prolonged.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic diagram of a battery steady-state protection circuit in an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a primary charging/discharging protection module according to an embodiment of the present invention;
fig. 3 is a schematic circuit diagram of the secondary charging protection module in the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a schematic diagram illustrating a battery steady-state protection circuit according to an embodiment of the present invention.
As shown in fig. 1, a battery steady-state protection circuit includes a battery pack, an overcharge protection module, a primary charge-discharge protection module, and a secondary charge protection module; basically, the circuit is provided with a positive electrode charging and discharging interface, the overcharge protection module is connected with the positive electrode charging and discharging interface, and the overcharge protection module is connected with the secondary charging protection module; the primary charging and discharging protection module is connected with the secondary charging protection module, and the secondary charging protection module is connected with the battery pack.
The utility model discloses in the implementation, overcharge protection module sets up anodal charge and discharge interface side is used for battery pack takes place to charge directly to cut off main charging circuit under the condition of excess temperature, once charge and discharge protection module mainly used is right battery pack's the charging process and the integrated monitoring of discharge process, secondary charge protection module mainly is directed against battery pack's charging process carries out secondary protection monitoring.
Referring to fig. 2 to 3, the modules shown in fig. 1 can be described as follows:
further, fig. 2 shows a circuit schematic diagram of a charge-discharge protection module in the embodiment of the present invention, a charge-discharge protection module includes charge-discharge switch controller group and charge-discharge protection controller, just the control end of charge-discharge switch controller group with the control end of charge-discharge protection controller is connected, the sense terminal of charge-discharge protection controller with the secondary charge protection module is connected. The charging and discharging protection controller comprises a lithium battery protection chip U1 with the model of S-8242AAX, and is mainly used for protection detection of a single lithium battery, and the specific expression is as follows: the VDD terminal of the chip U1 is connected to the precharge 1B + terminal of the battery pack (corresponding to the initial charging terminal of the secondary charging protection module) through a reference supply resistor R1, and resets its CO terminal to a low level (end-of-charge flag) when the voltage signal of the precharge 1B + terminal detected by the chip U1 in a charging state exceeds 4.25V, and resets its DO terminal to a low level (end-of-discharge flag) when the voltage signal of the precharge 1B + terminal detected by the chip U1 in a discharging state is lower than 2.5V; in addition, the VC port of the chip U1 is connected to the precharge 1BM port of the battery pack through a reference supply resistor R2, which is mainly used to detect whether the internal voltage value of the battery pack is within a controllable range of capacity, so as to ensure the basic safety performance of the battery pack.
The charge and discharge switch controller group comprises two power switch tubes (namely a field effect tube Q1 and a field effect tube Q2), and each power switch tube of the two power switch tubes adopts a field effect tube with the model number CJS 8810. In the implementation process, the fet Q1 and the control terminal G1 of the fet Q2 are both connected to the CO port of the chip U1, and can perform a charging control operation in accordance with a level signal of the CO port; the fet Q1 and the control terminal G2 of the fet Q2 are both connected to the DO port of the chip U1, and can perform discharge control according to the level signal of the DO port. Based on the parallel relation between the two power switch tubes, larger current can be allowed to pass in a normal on state, and the power-on and off capacity is enhanced in an off state.
Further, fig. 3 shows a circuit schematic diagram of the secondary charging protection module in the embodiment of the present invention, the secondary charging protection module includes two electric core charging detectors, and each electric core charging detector in the two electric core charging detectors is connected to the detection end of the charging and discharging protection controller, and each electric core charging detector in the two electric core charging detectors is connected to the battery assembly. Each of the two cell charge detectors includes a lithium battery protection chip of type S-8241GCL, which is described with the example of the lithium battery protection chip U2: the VDD terminal of the chip U2 is connected to the B + port of the battery assembly through the reference power supply resistor R16, and the VSS port thereof is connected to the BM port of the battery assembly, so that the voltage difference between the B + port and the BM port can be collected to confirm the voltage balance state inside the battery assembly, and based on the OC port of the chip U2 being connected to the gate of the switching tube Q3 and the switching tube Q3 being connected to the charging line of the precharge 1B + port and the precharge 1BM port, the chip U2 can control the on/off operation of the switching tube Q3 according to the current voltage balance state, and finally stabilize the charging voltage values of the B + port and the BM port of the battery assembly by disconnecting the charging line, thereby improving the service life of the battery assembly.
Specifically, the overcharge protection module includes a PTC thermistor, and as can be seen from fig. 2, the PTC thermistor is disposed on a main charging line between the positive charge-discharge interface (P + port) and the precharge 1B + port, and can cut off the main charging line when charging overheat occurs, and completely block transmission of an electrical signal to the precharge 1B + port according to the dc blocking and ac blocking characteristics of the capacitor C4, at this time, based on the connection relationship between the overcharge protection module and the secondary charge protection module and the connection relationship between the secondary charge protection module and the battery assembly, the battery assembly stops charging, so as to prevent the battery assembly from being damaged badly in a high-temperature environment.
In the embodiment of the utility model, the basic protection function of the battery component in the charging and discharging process can be realized by arranging the one-time charging and discharging protection module; the secondary charging protection module is arranged to realize stable regulation and control of the internal voltage of the battery pack, so that the safety performance of the battery pack is further guaranteed, and the service life of the battery pack is prolonged.
The embodiment of the present invention provides a battery steady-state protection circuit, and a specific example is adopted herein to explain the principle and the implementation of the present invention, and the description of the above embodiment is only used to help understand the method and the core idea of the present invention; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the specific implementation and application scope, to sum up, the content of the present specification should not be understood as the limitation of the present invention.
Claims (8)
1. A battery steady state protection circuit is characterized in that the circuit comprises a battery pack, an overcharge protection module, a primary charge and discharge protection module and a secondary charge protection module;
the circuit is provided with a positive electrode charging and discharging interface, the overcharge protection module is connected with the positive electrode charging and discharging interface, and the overcharge protection module is connected with the secondary charging protection module; the primary charging and discharging protection module is connected with the secondary charging protection module, and the secondary charging protection module is connected with the battery pack.
2. The battery steady-state protection circuit of claim 1, wherein the primary charging and discharging protection module comprises a charging and discharging switch controller group and a charging and discharging protection controller, a control end of the charging and discharging switch controller group is connected with a control end of the charging and discharging protection controller, and a detection end of the charging and discharging protection controller is connected with the secondary charging protection module.
3. The battery steady-state protection circuit of claim 2, wherein the charge-discharge protection controller comprises a lithium battery protection chip of type S-8242 AAX.
4. The battery steady-state protection circuit of claim 2, wherein the charge and discharge switch controller group comprises two power switch tubes, and the two power switch tubes are connected in parallel.
5. The battery steady-state protection circuit of claim 4, wherein each of the two power switches is a field effect transistor model CJS 8810.
6. The battery steady-state protection circuit of claim 2, wherein the secondary charge protection module comprises two cell charge detectors, and each of the two cell charge detectors is connected to the detection terminal of the charge-discharge protection controller, and each of the two cell charge detectors is connected to the battery pack.
7. The battery steady-state protection circuit of claim 6, wherein each of the two cell charge detectors comprises a lithium battery protection chip model S-8241 GCL.
8. The battery steady-state protection circuit of claim 1, wherein the overcharge protection module comprises a PTC thermistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023170063.1U CN214069561U (en) | 2020-12-24 | 2020-12-24 | Battery steady state protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023170063.1U CN214069561U (en) | 2020-12-24 | 2020-12-24 | Battery steady state protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214069561U true CN214069561U (en) | 2021-08-27 |
Family
ID=77387332
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202023170063.1U Expired - Fee Related CN214069561U (en) | 2020-12-24 | 2020-12-24 | Battery steady state protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214069561U (en) |
-
2020
- 2020-12-24 CN CN202023170063.1U patent/CN214069561U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210827 |
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| CF01 | Termination of patent right due to non-payment of annual fee |