CN204389654U - Based on the battery electric quantity detection system that cell resistance is followed the tracks of - Google Patents
Based on the battery electric quantity detection system that cell resistance is followed the tracks of Download PDFInfo
- Publication number
- CN204389654U CN204389654U CN201420839028.XU CN201420839028U CN204389654U CN 204389654 U CN204389654 U CN 204389654U CN 201420839028 U CN201420839028 U CN 201420839028U CN 204389654 U CN204389654 U CN 204389654U
- Authority
- CN
- China
- Prior art keywords
- pin
- battery
- resistance
- electric capacity
- battery core
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Secondary Cells (AREA)
Abstract
The utility model discloses a kind of battery electric quantity detection system of following the tracks of based on cell resistance, relate to the pick-up unit technical field of electric variable.Described detection system comprises battery core and detects IC, CPU and power supervisor, the battery cathode pin that described battery core detects IC is connected with the grounding pin of CPU, described battery core detects the SDA pin of IC and is connected with the SDA pin of CPU, described battery core detects the SCL pin of IC and is connected with the SCL pin of CPU, described battery core detects the HDQ pin of IC and is connected with the HDQ pin of CPU, and the SDA pin of described battery core detection IC, SCL pin and HDQ pin are connected with the voltage output pin of power supervisor through a pull-up resistor respectively.Described detection system incorporates the advantage counting these two kinds of electric quantity detection apparatus based on voltage and coulomb, can provide electric power detection very accurately for new battery and aged battery.
Description
Technical field
The utility model relates to the pick-up unit technical field of electric variable, particularly relates to a kind of battery electric quantity detection system of following the tracks of based on cell resistance.
Background technology
Monitoring cell electricity quantity is a kind of technology for predicting battery capacity under all system cloud gray model and idle condition.The number percent of battery capacity can being predicted, to the time exhausting or be full of, other data for reflecting battery health and security diagnostics can being obtained.At present, application has detection method based on voltage and coulombmeter detection method with the traditional detection method on electronics portable device.
Once, as follows based on the Pros and Cons of the detection method of voltage: advantage: without the need to completely electric discharge can learn, self discharge without the need to correction, very accurate under little load current conditions; Inferior position: due to internal cell impedance, accuracy is not good enough, existence function relation between impedance and temperature, aging and state of charge.Two, the Pros and Cons based on the detection method of coulombmeter is as follows: advantage: not by the impact of voltage measurement distortion, accuracy is determined by current integration hardware, monitor and feedback: 3-10% (depending on condition of work and purposes); Inferior position: need learning cycle to upgrade battery capacity, battery capacity is with aging and decline, and battery capacity reduces amplitude: 3-5% (100 chargings), when not learning, 10 monitor and feedback that often charge will increase by 1%, the necessary modeling of self discharge, otherwise inaccurate.
Utility model content
Technical problem to be solved in the utility model is to provide a kind of battery electric quantity detection system of following the tracks of based on cell resistance, described detection system incorporates the advantage counting these two kinds of electric quantity detection apparatus based on voltage and coulomb, all accurate measurements can be provided when small area analysis (OCV) and large load current, abandon inaccurate self discharge model (adopting OCV to read), can provide electric power detection very accurately for new battery and aged battery, capacity study is without the need to full charge and discharge completely.
For solving the problems of the technologies described above, technical solution adopted in the utility model is: a kind of battery electric quantity detection system of following the tracks of based on cell resistance, it is characterized in that: described detection system comprises battery core and detects IC, CPU and power supervisor, the battery cathode pin that described battery core detects IC is connected with the grounding pin of CPU, described battery core detects the SDA pin of IC and is connected with the SDA pin of CPU, described battery core detects the SCL pin of IC and is connected with the SCL pin of CPU, described battery core detects the HDQ pin of IC and is connected with the HDQ pin of CPU, the anode pin that described battery core detects IC is connected with the power input of power supervisor, described battery core detects the grounding pin of IC and is connected with the grounding pin of power supervisor, the VDD output pin of described power supervisor is connected with the VDD input pin of CPU, described battery core detects the SDA pin of IC, SCL pin and HDQ pin are connected with the voltage output pin of power supervisor through a pull-up resistor respectively.
Further technical scheme is: described battery core detects IC and comprises battery information detection chip and battery protection chip, the SE pin of described battery information detection chip is unsettled, the REG25 pin of described battery information detection chip and VCC draw foot meridian capacitor C3 ground connection, the REGIN pin first via of described battery information detection chip is connected with the positive pole pin of battery core interface J1, and the second tunnel of REGIN pin is through electric capacity C1 ground connection; The BAT pin first via of battery information detection chip is through electric capacity C2 ground connection, and the second tunnel is connected with the positive pole pin of battery core interface J1; The VSS pin of battery information detection chip and PwPd pin ground connection; The SRP pin of battery information detection chip through resistance R3 ground connection, the SRN pin ground connection after resistance R2 resistance R1 successively of battery information detection chip; The one termination SRP pin of electric capacity C7, another termination SRN pin of electric capacity C7, electric capacity C4 and electric capacity C5 is connected in parallel on the two ends of electric capacity C7 after connecting; The TS of battery information detection chip draws foot meridian capacitor C6 and is connected with the VCC pin of battery information detection chip, and thermistor RT1 is in parallel with electric capacity C6; The SDA pin of battery information detection chip is successively through resistance R4, resistance R10 and I
2the SDA pin of C communication interface J2 connects, the plus earth of diode D1, the negative pole connecting resistance R4 of diode D1 and the node of resistance R10, and resistance R7 is in parallel with diode D1; The SCL pin of battery information detection chip is successively through resistance R5, resistance R11 and I
2the SCL pin of C communication interface J2 connects, the negative pole connecting resistance R5 of diode D2 and the node of resistance R11, and resistance R8 is in parallel with diode D2; The HDQ pin of battery information detection chip is connected with the HDQ pin of HDQ communication interface J3 through resistance R6, resistance R12 successively, the negative pole connecting resistance R6 of diode D3 and the node of resistance R12, and resistance R8 is in parallel with diode D3;
The DS pin of battery protection chip is unsettled; the COUT pin of battery protection chip connects the grid of metal-oxide-semiconductor Q2; the V-pin of battery protection chip connects the source electrode of metal-oxide-semiconductor Q2 through resistance R17; the DOUT pin of battery protection chip connects the grid of metal-oxide-semiconductor Q1; the source electrode of metal-oxide-semiconductor Q1 is connected with the drain electrode of metal-oxide-semiconductor Q2; the drain electrode of the one termination metal-oxide-semiconductor Q1 of electric capacity C14; the other end of electric capacity C14 is connected with the source electrode of metal-oxide-semiconductor Q2 after electric capacity C15; the drain electrode connecting resistance R1 of metal-oxide-semiconductor Q1 and the node of resistance R2, the source electrode of metal-oxide-semiconductor Q2 respectively with I
2the battery cathode pin of C communication interface J2 and the battery cathode pin of HDQ communication interface J3 connect, the VDD pin of battery protection chip connects the positive pole pin of battery core interface J1 through resistance R15, the VSS pin of battery protection chip connects the negative pole pin of battery core interface J1, the VDD pin of the one termination battery protection chip of electric capacity C13, the VSS pin of another termination battery protection chip of electric capacity C13; The positive pole pin of battery core interface J1 respectively with I
2the anode pin of C communication interface J2 and the anode pin of HDQ communication interface J3 connect; After electric capacity C11 connects with electric capacity C12, one end is connected with the positive pole pin of battery core interface J1, and the other end is connected with the source electrode of metal-oxide-semiconductor Q2.
Further technical scheme is: described battery information detection chip model is BQ27541, and battery protection chip model is MM3511.
The beneficial effect adopting technique scheme to produce is: described power testing system incorporates and counts these two kinds of electric quantity detection apparatus advantage separately based on voltage and coulomb, all accurate detection can be provided when small area analysis (OCV) and large load current, abandon inaccurate self discharge model (adopting OCV to read), can provide electric quantity monitoring very accurately for new battery and aged battery, capacity study is without the need to full charge and discharge completely.Be applied on hand-held electronic equipment, can the battery information of more accurate detected electrons equipment, can the remaining runtime of report battery exactly, better power management can be provided, obtain longer cell runtime, and change shutoff voltage according to impedance with temperature, discharge rate and aging conditions.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
Fig. 1-2 is theory diagram of the present utility model;
Fig. 3 is the circuit theory diagrams that the utility model battery core detects IC.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only a part of embodiment of the present utility model, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
Set forth a lot of detail in the following description so that fully understand the utility model, but the utility model can also adopt other to be different from alternate manner described here to implement, those skilled in the art can when doing similar popularization without prejudice to when the utility model intension, and therefore the utility model is by the restriction of following public specific embodiment.
As shown in Figure 1-2, the utility model discloses a kind of battery electric quantity detection system of following the tracks of based on cell resistance, described detection system comprises battery core and detects IC, CPU and power supervisor.The battery cathode pin that described battery core detects IC is connected with the grounding pin of CPU, described battery core detects the SDA pin of IC and is connected with the SDA pin of CPU, described battery core detects the SCL pin of IC and is connected with the SCL pin of CPU, described battery core detects the HDQ pin of IC and is connected with the HDQ pin of CPU, the anode pin that described battery core detects IC is connected with the power input of power supervisor, described battery core detects the grounding pin of IC and is connected with the grounding pin of power supervisor, the VDD output pin of described power supervisor is connected with the VDD input pin of CPU, described battery core detects the SDA pin of IC, SCL pin and HDQ pin are connected with the voltage output pin of power supervisor through a pull-up resistor respectively.
Described power testing system is applied in the system on mobile electronic device, has two kinds of connected modes with electronic equipment:
(1) I is passed through
2c communication interface and system enter communication
Battery core is detected the I of IC
2the SDA pin of the SDA pin on C communication interface and SCL pin and CPU and pin SCL pin is corresponding is connected, these two circuits will be increased pull-up voltage on (being connected with corresponding voltage power supply by the resistance of a 4.7K ~ 20K), the size of upper pull-up voltage will detect voltage domain according to the inside of CPU and select, I
2c communication setting will meet I
2c communications protocol.
2) communication is entered by HDQ communication interface and system
Battery core is detected the HDQ pin on the HDQ communication interface of IC is corresponding with the HDQ pin of CPU to be connected, this circuit will be increased pull-up voltage on a 2.5V (being connected with 2.5V voltage source by the resistance of a 4.7K ~ 20K), and HDQ communication setting will meet HDQ communications protocol.
Further as shown in Figure 3, described battery core detects IC and comprises battery information detection chip and battery protection chip, and in the utility model, described battery information detection chip model is BQ27541, and battery protection chip model is MM3511.
The SE pin of described battery information detection chip is unsettled, the REG25 pin of described battery information detection chip and VCC draw foot meridian capacitor C3 ground connection, the REGIN pin first via of described battery information detection chip is connected with the positive pole pin of battery core interface J1, and the second tunnel of REGIN pin is through electric capacity C1 ground connection; The BAT pin first via of battery information detection chip is through electric capacity C2 ground connection, and the second tunnel is connected with the positive pole pin of battery core interface J1; The VSS pin of battery information detection chip and PwPd pin ground connection; The SRP pin of battery information detection chip through resistance R3 ground connection, the SRN pin ground connection after resistance R2 resistance R1 successively of battery information detection chip; The one termination SRP pin of electric capacity C7, another termination SRN pin of electric capacity C7, electric capacity C4 and electric capacity C5 is connected in parallel on the two ends of electric capacity C7 after connecting; The TS of battery information detection chip draws foot meridian capacitor C6 and is connected with the VCC pin of battery information detection chip, and thermistor RT1 is in parallel with electric capacity C6; The SDA pin of battery information detection chip is successively through resistance R4, resistance R10 and I
2the SDA pin of C communication interface J2 connects, the plus earth of diode D1, the negative pole connecting resistance R4 of diode D1 and the node of resistance R10, and resistance R7 is in parallel with diode D1; The SCL pin of battery information detection chip is successively through resistance R5, resistance R11 and I
2the SCL pin of C communication interface J2 connects, the negative pole connecting resistance R5 of diode D2 and the node of resistance R11, and resistance R8 is in parallel with diode D2; The HDQ pin of battery information detection chip is connected with the HDQ pin of HDQ communication interface J3 through resistance R6, resistance R12 successively, the negative pole connecting resistance R6 of diode D3 and the node of resistance R12, and resistance R8 is in parallel with diode D3;
The DS pin of battery protection chip is unsettled; the COUT pin of battery protection chip connects the grid of metal-oxide-semiconductor Q2; the V-pin of battery protection chip connects the source electrode of metal-oxide-semiconductor Q2 through resistance R17; the DOUT pin of battery protection chip connects the grid of metal-oxide-semiconductor Q1; the source electrode of metal-oxide-semiconductor Q1 is connected with the drain electrode of metal-oxide-semiconductor Q2; the drain electrode of the one termination metal-oxide-semiconductor Q1 of electric capacity C14; the other end of electric capacity C14 is connected with the source electrode of metal-oxide-semiconductor Q2 after electric capacity C15; the drain electrode connecting resistance R1 of metal-oxide-semiconductor Q1 and the node of resistance R2, the source electrode of metal-oxide-semiconductor Q2 respectively with I
2the battery cathode pin of C communication interface J2 and the battery cathode pin of HDQ communication interface J3 connect, the VDD pin of battery protection chip connects the positive pole pin of battery core interface J1 through resistance R15, the VSS pin of battery protection chip connects the negative pole pin of battery core interface J1, the VDD pin of the one termination battery protection chip of electric capacity C13, the VSS pin of another termination battery protection chip of electric capacity C13; The positive pole pin of battery core interface J1 respectively with I
2the anode pin of C communication interface J2 and the anode pin of HDQ communication interface J3 connect; After electric capacity C11 connects with electric capacity C12, one end is connected with the positive pole pin of battery core interface J1, and the other end is connected with the source electrode of metal-oxide-semiconductor Q2.
Battery core is the major part of the energy content of battery, for mobile electronic device provides energy.Battery information detection chip: the BAT pin of battery information detection chip receives battery core positive pole, is detected the voltage of battery core, and exports a 2.5V voltage by the LDO of 2.5V, for therein device provides voltage by the ADC of battery information detection chip inside; Between VCC pin and TS pin, be connected in series the NTC thermistor TR1 of a 10K, calculated the temperature of battery by inner ADC; The small resistor R1 in 0.01 Europe is increased (because this resistance meeting loss of energy between battery core and the negative pole of battery, so requirement is very little), receive the electric current SRP pin of battery information detection chip and SRN pin detecting electric current that battery core flows into and outflow, to realize calculating to battery core energy and prediction.The information of battery core energy and battery temperature is by HDQ communication interface or I
2c communication interface passes to CPU, and then the information of acquisition processes by CPU, according to the different corresponding events of condition setting process.
Battery protection chip: the effect of battery protection chip is when the electric current of overtension or output that battery core detected excessive (as occurred battery plus-negative plate dash); by turning off metal-oxide-semiconductor, the both positive and negative polarity of battery core is disconnected; to protect battery, it is very crucial safety device.
Mobile phone cell inner increases battery core and detects IC, is connected with mobile phone by battery connector.IC can be detected by battery core during mobile phone charge or discharge and obtain the electric current flowing into or release, thus calculate the capacity of battery, to logical contrast and the capacity calculating current battery, and the percent capacity bar of logical battery electric quantity icon display battery, the true capacity of battery can be shown more realistically to cellphone subscriber.
Claims (3)
1. a battery electric quantity detection system of following the tracks of based on cell resistance, it is characterized in that: described detection system comprises battery core and detects IC, CPU and power supervisor, the battery cathode pin that described battery core detects IC is connected with the grounding pin of CPU, described battery core detects the SDA pin of IC and is connected with the SDA pin of CPU, described battery core detects the SCL pin of IC and is connected with the SCL pin of CPU, described battery core detects the HDQ pin of IC and is connected with the HDQ pin of CPU, the anode pin that described battery core detects IC is connected with the power input of power supervisor, described battery core detects the grounding pin of IC and is connected with the grounding pin of power supervisor, the VDD output pin of described power supervisor is connected with the VDD input pin of CPU, described battery core detects the SDA pin of IC, SCL pin and HDQ pin are connected with the voltage output pin of power supervisor through a pull-up resistor respectively.
2. battery electric quantity detection system of following the tracks of based on cell resistance according to claim 1, it is characterized in that: described battery core detects IC and comprises battery information detection chip and battery protection chip, the SE pin of described battery information detection chip is unsettled, the REG25 pin of described battery information detection chip and VCC draw foot meridian capacitor C3 ground connection, the REGIN pin first via of described battery information detection chip is connected with the positive pole pin of battery core interface J1, and the second tunnel of REGIN pin is through electric capacity C1 ground connection; The BAT pin first via of battery information detection chip is through electric capacity C2 ground connection, and the second tunnel is connected with the positive pole pin of battery core interface J1; The VSS pin of battery information detection chip and PwPd pin ground connection; The SRP pin of battery information detection chip through resistance R3 ground connection, the SRN pin ground connection after resistance R2 resistance R1 successively of battery information detection chip; The one termination SRP pin of electric capacity C7, another termination SRN pin of electric capacity C7, electric capacity C4 and electric capacity C5 is connected in parallel on the two ends of electric capacity C7 after connecting; The TS of battery information detection chip draws foot meridian capacitor C6 and is connected with the VCC pin of battery information detection chip, and thermistor RT1 is in parallel with electric capacity C6; The SDA pin of battery information detection chip is successively through resistance R4, resistance R10 and I
2the SDA pin of C communication interface J2 connects, the plus earth of diode D1, the negative pole connecting resistance R4 of diode D1 and the node of resistance R10, and resistance R7 is in parallel with diode D1; The SCL pin of battery information detection chip is successively through resistance R5, resistance R11 and I
2the SCL pin of C communication interface J2 connects, the negative pole connecting resistance R5 of diode D2 and the node of resistance R11, and resistance R8 is in parallel with diode D2; The HDQ pin of battery information detection chip is connected with the HDQ pin of HDQ communication interface J3 through resistance R6, resistance R12 successively, the negative pole connecting resistance R6 of diode D3 and the node of resistance R12, and resistance R8 is in parallel with diode D3;
The DS pin of battery protection chip is unsettled; the COUT pin of battery protection chip connects the grid of metal-oxide-semiconductor Q2; the V-pin of battery protection chip connects the source electrode of metal-oxide-semiconductor Q2 through resistance R17; the DOUT pin of battery protection chip connects the grid of metal-oxide-semiconductor Q1; the source electrode of metal-oxide-semiconductor Q1 is connected with the drain electrode of metal-oxide-semiconductor Q2; the drain electrode of the one termination metal-oxide-semiconductor Q1 of electric capacity C14; the other end of electric capacity C14 is connected with the source electrode of metal-oxide-semiconductor Q2 after electric capacity C15; the drain electrode connecting resistance R1 of metal-oxide-semiconductor Q1 and the node of resistance R2, the source electrode of metal-oxide-semiconductor Q2 respectively with I
2the battery cathode pin of C communication interface J2 and the battery cathode pin of HDQ communication interface J3 connect, the VDD pin of battery protection chip connects the positive pole pin of battery core interface J1 through resistance R15, the VSS pin of battery protection chip connects the negative pole pin of battery core interface J1, the VDD pin of the one termination battery protection chip of electric capacity C13, the VSS pin of another termination battery protection chip of electric capacity C13; The positive pole pin of battery core interface J1 respectively with I
2the anode pin of C communication interface J2 and the anode pin of HDQ communication interface J3 connect; After electric capacity C11 connects with electric capacity C12, one end is connected with the positive pole pin of battery core interface J1, and the other end is connected with the source electrode of metal-oxide-semiconductor Q2.
3. battery electric quantity detection system of following the tracks of based on cell resistance according to claim 2, is characterized in that: described battery information detection chip model is BQ27541, and battery protection chip model is MM3511.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420839028.XU CN204389654U (en) | 2014-12-23 | 2014-12-23 | Based on the battery electric quantity detection system that cell resistance is followed the tracks of |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420839028.XU CN204389654U (en) | 2014-12-23 | 2014-12-23 | Based on the battery electric quantity detection system that cell resistance is followed the tracks of |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204389654U true CN204389654U (en) | 2015-06-10 |
Family
ID=53362362
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420839028.XU Expired - Fee Related CN204389654U (en) | 2014-12-23 | 2014-12-23 | Based on the battery electric quantity detection system that cell resistance is followed the tracks of |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204389654U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112557915A (en) * | 2020-11-30 | 2021-03-26 | Oppo广东移动通信有限公司 | Electric quantity detection circuit, electric quantity detection method and electronic equipment |
| WO2021077827A1 (en) * | 2019-10-22 | 2021-04-29 | 华为技术有限公司 | Battery capacity tracking method and apparatus, and electronic device |
| CN113064771A (en) * | 2021-03-04 | 2021-07-02 | 山东英信计算机技术有限公司 | I2C link checking method, system, terminal and storage medium |
-
2014
- 2014-12-23 CN CN201420839028.XU patent/CN204389654U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021077827A1 (en) * | 2019-10-22 | 2021-04-29 | 华为技术有限公司 | Battery capacity tracking method and apparatus, and electronic device |
| CN112557915A (en) * | 2020-11-30 | 2021-03-26 | Oppo广东移动通信有限公司 | Electric quantity detection circuit, electric quantity detection method and electronic equipment |
| CN113064771A (en) * | 2021-03-04 | 2021-07-02 | 山东英信计算机技术有限公司 | I2C link checking method, system, terminal and storage medium |
| CN113064771B (en) * | 2021-03-04 | 2023-02-28 | 山东英信计算机技术有限公司 | I2C link checking method, system, terminal and storage medium |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN204479723U (en) | Charging and discharging lithium battery characteristic marking apparatus | |
| CN102590609B (en) | The method of mobile terminal and measurement mobile terminal power consumption | |
| CN103683348B (en) | There is the electronic installation of power consumption detecting function | |
| CN102005795A (en) | Electric quantity detecting device for rechargeable battery | |
| CN103364619B (en) | The voltage detection method of terminal device and terminal device | |
| CN204389654U (en) | Based on the battery electric quantity detection system that cell resistance is followed the tracks of | |
| CN109217425A (en) | A kind of charger circuit and its intelligent charge control method | |
| CN103954852A (en) | Low-frequency noise testing method of high-voltage high-capacity capacitor | |
| CN102074984B (en) | Mobile terminal for detecting electric quantity of battery on line and detection method thereof | |
| CN102098368B (en) | Mobile phone | |
| CN203587780U (en) | Battery power detecting device | |
| CN103379421B (en) | The working state detecting method of digital microphone channel selecting pin and device | |
| CN104459544A (en) | Device and method used for detecting battery capacity and battery | |
| CN205297996U (en) | Novel charger fan detection circuitry | |
| CN202815193U (en) | Battery test device | |
| CN102157965B (en) | Charging control device and voltage detecting method for eliminating switch internal resistance by voltage clamping | |
| CN203434650U (en) | Battery management device | |
| CN206804840U (en) | Battery data logging device | |
| CN205301539U (en) | Communication computer lab falls behind battery information calibration device based on thing networking | |
| CN204514996U (en) | Alternating current testing circuit | |
| CN104181370A (en) | Load current detection circuit and detection device | |
| CN203759124U (en) | Portable rail seam resistance tester | |
| CN207234519U (en) | Outage detection control circuit and gas meter, flow meter | |
| CN203722293U (en) | Cell management apparatus carrying out management on cell charging and discharging | |
| CN101769954A (en) | Voltage detecting circuit for multiple serial batteries |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150610 Termination date: 20151223 |
|
| EXPY | Termination of patent right or utility model |