CN203911461U - Multiple lithium battery overvoltage protection circuit - Google Patents
Multiple lithium battery overvoltage protection circuit Download PDFInfo
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- CN203911461U CN203911461U CN201420231506.9U CN201420231506U CN203911461U CN 203911461 U CN203911461 U CN 203911461U CN 201420231506 U CN201420231506 U CN 201420231506U CN 203911461 U CN203911461 U CN 203911461U
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Abstract
The utility model discloses a multiple lithium battery overvoltage protection circuit. The multiple lithium battery overvoltage protection circuit comprises battery substring protection circuits in the same number with the number of battery substrings, an overvoltage output conversion circuit, a high-voltage isolation circuit, and a low-voltage alarm signal processing circuit. The battery substring protection circuits, the overvoltage output conversion circuit, the high-voltage isolation circuit, and the low-voltage alarm signal processing circuit are electrically connected in sequence. The battery substring protection circuits are connected in parallel with each other. The output end of the low-voltage alarm signal processing circuit is electrically connected with the alarm through an ECU. Each battery substring protection circuit is electrically connected with each battery substring. The lithium battery overvoltage protection circuit is characterized by performing overvoltage protection on random series-connected batteries through increasing or decreasing the parallel-connected battery substring protection circuits.
Description
Technical field
The utility model relates to the cell safety technical field of electric automobile, especially relates to a kind of multisection lithium battery overvoltage crowbar that the battery cell of a series connection is arbitrarily carried out to overvoltage protection of realizing.
Background technology
Common battery protecting circuit can carry out voltage monitoring and voltage protection to several default batteries; but; in the time need to carrying out the quantity change of battery of voltage monitoring and voltage protection, need to carry out adaptability reform to the structure of protective circuit, the operation more complicated of transformation.
Chinese patent mandate publication number: CN203299255U, authorize open day on May 27th, 2013, a kind of voltage detecting circuit and battery protection system of multiple battery core units in series are disclosed, described voltage detecting circuit comprises voltage detection module, memory module and logic decision module, voltage detection module detects the voltage of each battery core unit periodically one by one, and the voltage of the each battery core unit detecting and HVT high voltage threshold and/or low pressure threshold are compared, to export whether abnormal voltage detection signal; Memory module was used for storing in the current detection cycle, the voltage detection signal corresponding to each battery core unit of voltage detection module output; Logic decision module is carried out logic decision according to all battery cores unit of described memory module storage at voltage detection signal corresponding to current detection cycle; if when at least one voltage detection signal is abnormal voltage detection signal, logic decision module output protection signal.The weak point of this utility model is, circuit complexity, the operation more complicated that the structure of protective circuit is transformed.
Summary of the invention
Goal of the invention of the present utility model is the deficiency of the transformation operation more complicated in order to overcome battery protecting circuit of the prior art, and a kind of multisection lithium battery overvoltage crowbar that the battery cell of a series connection is arbitrarily carried out to overvoltage protection of realizing is provided.
To achieve these goals, the utility model is by the following technical solutions:
A kind of multisection lithium battery overvoltage crowbar, described multisection lithium battery overvoltage crowbar is located on electric automobile, described electric automobile comprises the battery strings that ECU, alarm and the lithium battery monomer of being connected successively by several form, described battery strings is divided into several battery substrings, and battery strings comprises total positive pole, total negative pole; Described multisection lithium battery overvoltage crowbar comprises battery substring protective circuit, overvoltage output conversion circuit, high pressure buffer circuit and the low pressure alarming signal processing circuit identical with battery substring quantity; Described battery substring protective circuit, overvoltage output conversion circuit, high pressure buffer circuit and low pressure alarming signal processing circuit are electrically connected successively; each battery substring protective circuit is parallel with one another; the output of described low pressure alarming signal processing circuit is electrically connected with alarm by ECU, and each battery substring protective circuit is electrically connected with each battery substring respectively.
Battery substring protective circuit of the present utility model is electrically connected with the battery cell in each battery substring respectively, and operation principle of the present utility model is as follows:
In the overvoltage protection chip of battery substring protective circuit, be provided with overvoltage detection threshold Vov and overvoltage and detect Td time of delay; when overvoltage protective core sheet detects that voltage difference between the both positive and negative polarity of certain batteries is greater than overvoltage thresholding Vov and duration and is greater than overvoltage and detects time of delay when Td; overvoltage protection chip is by overvoltage output conversion circuit, high pressure buffer circuit and low pressure alarming signal processing circuit output alarm signal; ECU collects after low level alarm signal; control alarm equipment alarm, make driver and crew in time to battery cell overvoltage intervene control.
Therefore, the utility model provides a kind of high-precision voltage protection circuit, and circuit safety, reliability are high, can realize the function of a series-connected cell monomer arbitrarily being carried out to overvoltage protection by increasing or reduce battery substring protective circuit in parallel.
As preferably, described battery substring protective circuit comprises filter circuit, S8244-XINZENG overvoltage protection chip and the NMOS pipe Q1200 of electrical connection successively; Described filter circuit is electrically connected with battery substring, and NMOS pipe Q1200 is electrically connected with overvoltage output conversion circuit.
As preferably, described overvoltage output conversion circuit comprises resistance R 1206, R1207 and R1208, diode D1200, capacitor C 1206 and PMOS pipe Q1201; Described R1206 one end is electrically connected with battery substring protective circuit; the R1206 other end is electrically connected with the G utmost point of positive pole, R1207 one end, C1206 one end and the Q1201 of diode D1200 respectively; the S of negative pole, the R1207 other end, the C1206 other end and the Q1201 of diode D1200 is extremely all electrically connected with total positive pole, and the D utmost point of Q1201 is electrically connected with high pressure buffer circuit by resistance R 1208.
As preferably, described high pressure buffer circuit comprises resistance R 1212 and ACPL-M43T-500E light isolating chip; Described resistance R 1212 one end are electrically connected with the output of overvoltage output conversion circuit and 1 pin of light isolating chip respectively, and resistance R 1212 other ends are electrically connected with 3 pins of total negative pole and light isolating chip respectively; 6 pins of light isolating chip are electrically connected with VCC, and 5 pins are electrically connected with low pressure alarming signal processing circuit, 4 pin ground connection.
High pressure buffer circuit is for isolation transmission over voltage alarm signal between overvoltage output conversion circuit and low pressure alarming signal processing circuit, when after the luminous conducting of photodiode between the 1st, 3 pins of light isolating chip, the 5th pin output overvoltage alarm signal of light isolating chip is to low pressure alarming signal processing circuit, Low level effective.
As preferably, described low pressure alarming signal processing circuit comprises capacitor C 1208, C1209, resistance R 1213, R1211, diode D1201 and PMOS pipe Q1202; Described C1208 one end ground connection, the other end is electrically connected with the G utmost point of D1201 negative pole, R1211 one end, R1213 one end and Q1202 respectively; D1201 plus earth, the R1211 other end is electrically connected with alarm; The S of the R1213 other end and Q1202 is extremely all electrically connected with C1209 one end and is electrically connected with VCC; The D utmost point of Q1202 is electrically connected with alarm, C1209 other end ground connection.
Alarm signal is through the over voltage alarm signal of the 5th pin output low level of light isolating chip, and an other road low level over voltage alarm signal is exported in PMOS pipe Q1202 conversion simultaneously; In the time of battery output overvoltage, two-way over voltage alarm signal is low level, alarm equipment alarm, thus make the timely manual intervention of driver and crew.
As preferably, each battery substring comprises 4 lithium batteries of series connection successively, and battery substring is 2 to 5.
Therefore, the utlity model has following beneficial effect: (1) circuit safety, reliability are high; (2), by increasing or reduce battery substring protective circuit in parallel, can realize the battery cell of a series connection is arbitrarily carried out to overvoltage protection; (3) circuit structure is simple, and increase and decrease is convenient.
Brief description of the drawings
Fig. 1 is a kind of theory diagram of the present utility model;
Fig. 2 is a kind of circuit diagram of the 3rd battery substring protective circuit of the present utility model, overvoltage output conversion circuit and high pressure buffer circuit;
Fig. 3 is a kind of circuit diagram of overvoltage output conversion circuit of the present utility model, high pressure buffer circuit and low pressure alarming signal processing circuit;
Fig. 4 is a kind of circuit diagram of the second battery substring protective circuit of the present utility model;
Fig. 5 is a kind of circuit diagram of the first battery substring protective circuit of the present utility model.
In figure: alarm 1, lithium battery substring 2, battery cell 3, battery substring protective circuit 4, overvoltage output conversion circuit 5, high pressure buffer circuit 6, low pressure alarming signal processing circuit 7, the second battery substring protective circuit 8, the first battery substring protective circuit 9, filter circuit 10, the 3rd battery substring protective circuit 11.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is further described.
Embodiment is as shown in Figure 1 a kind of multisection lithium battery overvoltage crowbar, multisection lithium battery overvoltage crowbar is located on electric automobile, electric automobile comprises ECU, alarm 1 and the battery strings that are made up of 12 lithium battery monomers 3 of connecting successively, battery strings is divided into 3 battery substrings 2, and battery strings comprises total positive pole, total negative pole; Multisection lithium battery overvoltage crowbar comprises and electricity 3 battery substring protective circuits 4, overvoltage output conversion circuit 5, high pressure buffer circuit 6 and low pressure alarming signal processing circuits 7; Battery substring protective circuit, overvoltage output conversion circuit, high pressure buffer circuit and low pressure alarming signal processing circuit are electrically connected successively; each battery substring protective circuit is parallel with one another; the output of low pressure alarming signal processing circuit is electrically connected with alarm by ECU, and each battery substring protective circuit is electrically connected with each battery substring respectively.
3 battery substring protective circuits are respectively the 3rd battery substring protective circuit 11 as shown in Figure 2, the second battery substring protective circuit 8 as shown in Figure 4 and the first battery substring protective circuit 9 as shown in Figure 5; In Fig. 1, each battery cell numbering is from the bottom to top followed successively by 1,2 ..., 12.
As shown in Figure 2, battery substring protective circuit comprises filter circuit 10, S8244-XINZENG overvoltage protection chip and the NMOS pipe Q1200 of electrical connection successively; Filter circuit is electrically connected with battery substring, and NMOS pipe Q1200 is electrically connected with overvoltage output conversion circuit.
Overvoltage output conversion circuit comprises resistance R 1206, R1207 and R1208, diode D1200, capacitor C 1206 and PMOS pipe Q1201; R1206 one end is electrically connected with battery substring protective circuit; the R1206 other end is electrically connected with the G utmost point of positive pole, R1207 one end, C1206 one end and the Q1201 of diode D1200 respectively; the S of negative pole, the R1207 other end, the C1206 other end and the Q1201 of diode D1200 is extremely all electrically connected with the total positive pole of battery substring, and the D utmost point of Q1201 is electrically connected with high pressure buffer circuit by resistance R 1208.
As shown in Figure 2 and Figure 3, high pressure buffer circuit comprises resistance R 1212 and ACPL-M43T-500E light isolating chip; Resistance R 1212 one end are electrically connected with the output of overvoltage output conversion circuit and 1 pin of light isolating chip respectively, and resistance R 1212 other ends are electrically connected with 3 pins of total negative pole and light isolating chip respectively; 6 pins of light isolating chip are electrically connected with VCC, and 5 pins are electrically connected with low pressure alarming signal processing circuit, 4 pin ground connection.
Low pressure alarming signal processing circuit comprises capacitor C 1208, C1209, resistance R 1213, R1211, diode D1201 and PMOS pipe Q1202; C1208 one end ground connection, the other end is electrically connected with the G utmost point of D1201 negative pole, R1211 one end, R1213 one end and Q1202 respectively; D1201 plus earth, the R1211 other end is electrically connected with alarm; The S of the R1213 other end and Q1202 is extremely all electrically connected with C1209 one end and is electrically connected with VCC; The D utmost point of Q1202 is electrically connected with alarm, C1209 other end ground connection.
Each battery substring comprises 4 lithium batteries of series connection mutually, and battery substring is 3.
BCB0, IBCB1 ... IBCB12 is the sampled input signal of 12 battery cells, and wherein IBCB0 is that total negative pole of whole battery strings is also the negative pole of the first battery substring simultaneously, and VBATB is total positive pole of whole battery strings, and IBCB1 is the positive pole of first segment battery.
As shown in Fig. 2, Fig. 4 and Fig. 5, filter circuit is by the filter circuit of 4 RC the electric circuit constitutes, and the effect of current limliting is also played in the interference in filtering sample line simultaneously, can prevent that chip from damaging because of overcurrent.
As shown in Figure 2, when overvoltage appears in any road cell voltage, and the duration of overvoltage be greater than the time of setting, the 8th pin CO output high level driving N metal-oxide-semiconductor Q1200 of overvoltage protection chip opens, output overvoltage alarm signal.
After NMOS pipe Q1200 opens, resistance R 1206 and resistance R 1207 produce dividing potential drop, make the base voltage of PMOS pipe Q1201 be less than source voltage, drive PMOS pipe Q1201 source electrode and drain electrode conducting.The source electrode of PMOS pipe Q1201 is directly to connect total positive pole, just can drive the luminous conducting of photodiode of light isolating chip after the conducting of PMOS pipe.
Operation principle of the present utility model is as follows:
The overvoltage detection threshold Vov of overvoltage protection chip is 3.700V～4.500V, can select corresponding overvoltage detection threshold according to different demands.The first battery substring protective circuit detects the 1st voltage to the 4th battery cell, and the second battery substring protective circuit detects the voltage of the 5th to 8 battery cells, and the 3rd battery substring protective circuit detects the 9th voltage to the 12nd battery cell.
As shown in Figure 4, the overvoltage testing process of Section 6 battery cell is:
Be greater than overvoltage and detect time of delay when Td when the voltage difference between the both positive and negative polarity of overvoltage protective core sheet batteries is greater than overvoltage thresholding Vov and duration, overvoltage protection chip U11 output high level is to the base stage of NMOS pipe Q1100, drive drain electrode and source electrode conducting, the resistance R 1106 and the source electrode conducting that cause drain electrode to connect, between R1207 and R1106, form electric resistance partial pressure, base voltage in PMOS pipe Q1201 is less than source voltage, PMOS conducting, light-emitting diode work in light isolating chip, through the interlock circuit processing in low pressure alarming signal processing circuit, ECU collects after low level alarm signal, control alarm equipment alarm, thereby effectively control battery cell overvoltage.
1st, the voltage monitoring process of 2,3,4,5 and 7,8,9,10,11 and 12 batteries monomers and the overvoltage testing process of Section 6 battery cell are similar.
Should be understood that the present embodiment is only not used in restriction scope of the present utility model for the utility model is described.In addition should be understood that those skilled in the art can make various changes or modifications the utility model after having read the content of the utility model instruction, these equivalent form of values fall within the application's appended claims limited range equally.
Claims (6)
1. a multisection lithium battery overvoltage crowbar, described multisection lithium battery overvoltage crowbar is located on electric automobile, the battery strings that described electric automobile comprises ECU, alarm (1) and the lithium battery monomer (3) of being connected successively by several forms, described battery strings is divided into several battery substrings (2), and battery strings comprises total positive pole, total negative pole; It is characterized in that, described multisection lithium battery overvoltage crowbar comprises the battery substring protective circuit (4) identical with battery substring quantity, overvoltage output conversion circuit (5), high pressure buffer circuit (6) and low pressure alarming signal processing circuit (7); Described battery substring protective circuit, overvoltage output conversion circuit, high pressure buffer circuit and low pressure alarming signal processing circuit are electrically connected successively; each battery substring protective circuit is parallel with one another; the output of described low pressure alarming signal processing circuit is electrically connected with alarm by ECU, and each battery substring protective circuit is electrically connected with each battery substring respectively.
2. multisection lithium battery overvoltage crowbar according to claim 1, is characterized in that, described battery substring protective circuit comprises filter circuit (10), S8244-XINZENG overvoltage protection chip and the NMOS pipe Q1200 of electrical connection successively; Described filter circuit is electrically connected with battery substring, and NMOS pipe Q1200 is electrically connected with overvoltage output conversion circuit.
3. multisection lithium battery overvoltage crowbar according to claim 1, is characterized in that, described overvoltage output conversion circuit comprises resistance R 1206, R1207 and R1208, diode D1200, capacitor C 1206 and PMOS pipe Q1201; Described R1206 one end is electrically connected with battery substring protective circuit; the R1206 other end is electrically connected with the G utmost point of positive pole, R1207 one end, C1206 one end and the Q1201 of diode D1200 respectively; the S of negative pole, the R1207 other end, the C1206 other end and the Q1201 of diode D1200 is extremely all electrically connected with total positive pole, and the D utmost point of Q1201 is electrically connected with high pressure buffer circuit by resistance R 1208.
4. multisection lithium battery overvoltage crowbar according to claim 1, is characterized in that, described high pressure buffer circuit comprises resistance R 1212 and ACPL-M43T-500E light isolating chip; Described resistance R 1212 one end are electrically connected with the output of overvoltage output conversion circuit and 1 pin of light isolating chip respectively, and resistance R 1212 other ends are electrically connected with 3 pins of total negative pole and light isolating chip respectively; 6 pins of light isolating chip are electrically connected with VCC, and 5 pins are electrically connected with low pressure alarming signal processing circuit, 4 pin ground connection.
5. multisection lithium battery overvoltage crowbar according to claim 1, is characterized in that, described low pressure alarming signal processing circuit comprises capacitor C 1208, C1209, resistance R 1213, R1211, diode D1201 and PMOS pipe Q1202; Described C1208 one end ground connection, the other end is electrically connected with the G utmost point of D1201 negative pole, R1211 one end, R1213 one end and Q1202 respectively; D1201 plus earth, the R1211 other end is electrically connected with alarm; The S of the R1213 other end and Q1202 is extremely all electrically connected with C1209 one end and is electrically connected with VCC; The D utmost point of Q1202 is electrically connected with alarm, C1209 other end ground connection.
6. according to the multisection lithium battery overvoltage crowbar described in claim 1 or 2 or 3 or 4 or 5, it is characterized in that, each battery substring comprises 4 lithium batteries of series connection successively, and battery substring is 2 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420231506.9U CN203911461U (en) | 2014-05-07 | 2014-05-07 | Multiple lithium battery overvoltage protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420231506.9U CN203911461U (en) | 2014-05-07 | 2014-05-07 | Multiple lithium battery overvoltage protection circuit |
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| Publication Number | Publication Date |
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| CN203911461U true CN203911461U (en) | 2014-10-29 |
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| CN201420231506.9U Expired - Fee Related CN203911461U (en) | 2014-05-07 | 2014-05-07 | Multiple lithium battery overvoltage protection circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104505886A (en) * | 2014-12-19 | 2015-04-08 | 无锡中星微电子有限公司 | Multi-lithium battery protecting circuit and system |
| CN104600675A (en) * | 2015-01-13 | 2015-05-06 | 深圳天邦达科技有限公司 | Lithium battery protection circuit |
-
2014
- 2014-05-07 CN CN201420231506.9U patent/CN203911461U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104505886A (en) * | 2014-12-19 | 2015-04-08 | 无锡中星微电子有限公司 | Multi-lithium battery protecting circuit and system |
| CN104600675A (en) * | 2015-01-13 | 2015-05-06 | 深圳天邦达科技有限公司 | Lithium battery protection circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: WANXIANG A123 SYSTEMS CO., LTD. Free format text: FORMER NAME: ZHEJIANG WANXIANG YINENG POWER BATTERY CO., LTD. |
|
| CP01 | Change in the name or title of a patent holder |
Address after: 311215 Xiaoshan economic and Technological Development Zone, Zhejiang, No. two road, building No. 118, No. Patentee after: Universal A 1 System Co., Ltd Patentee after: Wanxiang Electric Vehicle Co., Ltd. Patentee after: Wanxiang Group Corporation Address before: 311215 Xiaoshan economic and Technological Development Zone, Zhejiang, No. two road, building No. 118, No. Patentee before: ZHEJIANG WANXIANG YINENG POWER BATTERY CO., LTD. Patentee before: Wanxiang Electric Vehicle Co., Ltd. Patentee before: Wanxiang Group Corporation |
|
| C56 | Change in the name or address of the patentee | ||
| CP03 | Change of name, title or address |
Address after: 311215 Xiaoshan economic and Technological Development Zone, Zhejiang District, No. two road, building No. 855, No. Patentee after: Wanxiang 123 Co Ltd Patentee after: Wanxiang Electric Vehicle Co., Ltd. Patentee after: Wanxiang Group Corporation Address before: 311215 Xiaoshan economic and Technological Development Zone, Zhejiang, No. two road, building No. 118, No. Patentee before: Universal A 1 System Co., Ltd Patentee before: Wanxiang Electric Vehicle Co., Ltd. Patentee before: Wanxiang Group Corporation |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141029 Termination date: 20200507 |