CN214585665U - Multi-shunt current sampling circuit, current measuring device and battery pack - Google Patents
Multi-shunt current sampling circuit, current measuring device and battery pack Download PDFInfo
- Publication number
- CN214585665U CN214585665U CN202120366345.4U CN202120366345U CN214585665U CN 214585665 U CN214585665 U CN 214585665U CN 202120366345 U CN202120366345 U CN 202120366345U CN 214585665 U CN214585665 U CN 214585665U
- Authority
- CN
- China
- Prior art keywords
- shunt
- current
- sampling circuit
- resistance
- sampling
- 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.)
- Active
Links
Images
Classifications
-
- 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
Abstract
The utility model discloses a many shunts current sampling circuit, current measurement device and battery package, including a plurality of parallelly connected reposition of redundant personnel branch roads, every reposition of redundant personnel branch road includes shunt resistance and 1 at least sampling compensation resistance, wherein shunt resistance in every reposition of redundant personnel branch road connects in parallel and on a power branch road with the shunt resistance in other reposition of redundant personnel branch roads respectively, and sampling compensation resistance in every reposition of redundant personnel branch road has the same resistance value and is greater than the wire resistance by the wire contribution in the reposition of redundant personnel branch road for when carrying out voltage sampling to this every reposition of redundant personnel branch road, voltage on the wire resistance approaches to zero. The matching resistor with larger resistance is arranged on each shunt branch, so that the current in the sampling circuit is reduced, the influence caused by the resistance of the wire in the circuit is reduced, the error is reduced, and the precision is improved.
Description
Technical Field
The utility model belongs to the technical field of the battery package management technique and specifically relates to a many shunts current sampling circuit and current measurement device and battery package.
Background
With the development of new energy industry, battery systems are widely applied in the fields of automobiles and energy storage. How to more accurately monitor the change of each index in the working process of the battery becomes the main direction of the development of new energy technology; however, current measurement is used as the operation input of the battery energy storage system in a plurality of key indexes such as the state of charge (SOC), the maximum output power (SOP), the service life (SOH) of the battery and the like, so that the improvement of the measurement accuracy of the working current of the battery energy storage system is of great significance.
The battery energy storage system usually adopts a Hall element as a front-end sensor for current measurement, and although the battery energy storage system has the characteristics of good electrical isolation characteristic and wide measurement range, the Hall sensor has the defect of large volume and is not beneficial to the light weight of the system structure, and the Hall sensor has the characteristic of magnetic saturation so as to increase the nonlinear error of large current measurement.
Because hall sensors have some defects which cannot be overcome, a current divider resistor with high cost performance and high measurement accuracy is considered to be used as a current sensor in many current measurement schemes at present; based on ohm's law, the shunt resistance converts the current signal passing through it into a voltage signal, and since the shunt resistance is a linear element, the linearity of the output voltage signal is good, and the signal bandwidth is large.
In the application of small battery packs, the current of the small battery packs is different from dozens of A to hundreds of A, and an on-board patch type shunt is often adopted as a current sampling resistor. However, in the case of large current (> 30A), the power of a single shunt cannot meet the use requirement.
In the existing solutions:
1: selecting a plug-in high-power shunt or an external high-power shunt;
2: the overcurrent capacity of the shunt is increased by adopting a mode of connecting a plurality of small patch type shunts in parallel.
For the selected plug-in high-power shunt or the external high-power shunt; the disadvantages are large volume, high material cost and complex processing technology.
To adopting the parallelly connected mode of a plurality of small-size SMD shunts to increase the ability of overflowing of shunt, the shortcoming is: because of the difference of the shunt routing on the PCB board, the actual over current of each shunt is not consistent, and the precision is reduced during the whole sampling.
Referring to fig. 1, fig. 1 is a schematic diagram of a conventional multi-shunt current sampling circuit. As shown in fig. 1, when current sampling is performed, in order to increase the overcurrent capacity of the shunt, after a plurality of shunts are connected in parallel, the voltage value U is read as a whole, and the system current is calculated as follows:
wherein R1-R4 are generally the same in resistance. But actually due to the routing of each shunt on the PCB boardThe diameters are different, the currents passed by the shunts are different, so that voltages at two ends of R1-R4 are different, when sampling lines are connected in parallel to sample U, large currents can flow on the sampling lines, equivalent resistances of the sampling lines are different, and large sampling errors can be introduced when the currents are calculated.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model aims at providing a new shunt current sampling circuit can reduce the error among the current many shunt sampling circuits, improves the sampling precision, ensures the safe in utilization of battery. Meanwhile, the invention also provides a current measuring device with the current sampling circuit and a battery pack.
According to the utility model discloses a many shunts current sampling circuit that purpose provided, including a plurality of parallelly connected reposition of redundant personnel branch roads, every reposition of redundant personnel branch road includes shunt resistance and 1 at least sampling compensating resistor, wherein shunt resistance in every reposition of redundant personnel branch road is parallelly connected and is on a power branch road with the shunt resistance in other reposition of redundant personnel branch roads respectively, and sampling compensating resistor in every reposition of redundant personnel branch road has the same resistance value and is greater than the wire resistance by the wire contribution in the reposition of redundant personnel branch road for when carrying out voltage sampling to this every reposition of redundant personnel branch road, voltage on the wire resistance is close to zero.
Preferably, each shunt branch includes 2 sampling compensation resistors, and the 2 sampling compensation resistors are distributed on two sides of the shunt resistor.
Preferably, the two sampling compensation resistors have equal resistance values.
Preferably, the power supply branch comprises a constant current source, a negative electrode of the constant current source is grounded, and a positive electrode of the constant current source is connected to a parallel circuit formed by a plurality of shunt resistors.
Preferably, two ends of each shunt branch constitute a voltage acquisition end of the multi-shunt current sampling circuit.
According to the utility model discloses a purpose has still provided a current measuring device, include as above many shunts current sampling circuit, connect voltage acquisition unit on many shunts current sampling circuit's voltage acquisition end is connected voltage acquisition unit is used for with the voltage signal conversion that voltage acquisition unit gathered becomes current signal's signal processing unit.
Preferably, the device also comprises a control unit which is connected with and sends control signals to the voltage acquisition unit and the signal processing unit so as to drive the voltage acquisition unit and the signal processing unit to work and receive processing results fed back by the signal processing unit.
According to the purpose of the invention, the invention also provides a battery pack, and the output end of the battery pack is provided with the current measuring device.
Compared with the prior art, the utility model discloses owing to set up the matching resistance who has great resistance on every reposition of redundant personnel branch road for electric current diminishes in the sampling circuit, thereby reduces the influence that wire resistance produced in the circuit, reduces the error, improves the precision.
Drawings
Fig. 1 is a schematic diagram of a conventional multi-shunt current sampling circuit.
Fig. 2 is a schematic diagram of the multi-shunt current sampling circuit of the present invention.
Fig. 3 is a schematic diagram of the current measuring device of the present invention.
Detailed Description
The present invention will be described in detail with reference to the specific embodiments shown in the drawings, but the embodiments are not limited to the present invention, and structural, methodological, or functional changes made by those skilled in the art according to the embodiments are included in the scope of the present invention.
The technical solution of the present invention will be described in detail with reference to the following embodiments. It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the word "/", herein, generally indicates that the objects associated therewith are in an "or" relationship.
The word "if," as used herein, may be interpreted to mean "when a. Similarly, the phrases "if determined" or "if detected (a stated condition or event)" may be construed as "when determined" or "in response to a determination" or "when detected (a stated condition or event)" or "in response to a detection (a stated condition or event)", depending on the context.
Referring to fig. 2, fig. 2 is a schematic diagram of the multi-shunt current sampling circuit of the present invention. As shown, the current sampling circuit includes a plurality of shunt branches 11 connected in parallel, and each shunt branch 11 includes a shunt resistor R1 and at least 1 sampling compensation resistor R2. In the illustrated embodiment, 4 shunt branches 11 are illustrated, so there are 4 shunt resistors R1 in total, in practical application, the number of the shunt branches 11 may be determined according to requirements, and the number of the shunt resistors R1 may be matched with that of the shunt branches 11, or may be more than that of the shunt branches 11, for example, each shunt branch 11 may be provided with 2 or more than 2 shunt resistors R1. In the illustrated embodiment, the number of the sampling compensation resistors R2 in each shunt branch 11 is 2, and the sampling compensation resistors R2 are distributed on two sides of the shunt resistor R1, and actually, the number of the sampling compensation resistors R2 may be 1 or multiple.
The shunt resistor R1 in each shunt branch 11 is connected in parallel to the shunt resistors in other shunt branches in the power supply branch 12, and the sampling compensation resistor R2 in each shunt branch 11 has the same resistance value and is larger than the wire resistance contributed by the wire in the shunt branch, so that when sampling the voltage of each shunt branch 11, since the sampling compensation resistor R2 is much larger than the wire resistance, on one hand, the current on the shunt branch is limited, on the other hand, the divided voltage on the wire resistance is almost zero compared with the shunt resistor R1 and the sampling compensation resistor R2, the influence of the difference on the wire resistance in each shunt branch 11 is eliminated, and the total current formula is still suitable for the current calculation formula in the parallel circuit of 4 shunt resistors R1.
Preferably, when the shunt resistor R1 has the sampling compensation resistor R2 on both sides, the 2 sampling compensation resistors R2 have equal resistance values, so that the error caused by the wire resistors on both sides can be reduced.
Referring to fig. 2 again, the power supply branch 12 includes a constant current source, the negative electrode of which is grounded, and the positive electrode of which is connected to a parallel circuit formed by a plurality of shunt resistors. In an actual application, a voltage acquisition unit may be disposed at the voltage acquisition end, and the voltage acquisition unit acquires voltages at two ends of the shunt resistors R1, and then converts the voltages into current values, so as to obtain a sampling result.
Referring to fig. 3, fig. 3 is a schematic diagram of a current measuring device according to the present invention, as shown in the figure, the current measuring device includes the above-mentioned multi-shunt current sampling circuit 10, a voltage collecting unit 20 connected to a voltage collecting terminal of the multi-shunt current sampling circuit, a signal processing unit 30 connected to the voltage collecting unit 20 for converting a voltage signal collected by the voltage collecting unit 20 into a current signal, and a control unit 40 connected to and sending a control signal to the voltage collecting unit 20 and the signal processing unit 30 to drive the voltage collecting unit 20 and the signal processing unit 30 to operate and receive a processing result fed back by the signal processing unit. The final measurement result can be displayed through a display device or fed back through an integrated battery management unit, so that the battery management unit generates processing strategies under different measurement results, for example, when the measured current is too small, the reason that damage or insufficient electric quantity exists in the battery assembly of the dog is judged.
And finally, the utility model discloses a current measurement device uses on the battery package, through setting up on the output of battery package, is used for the working condition of control or measurement battery package.
To sum up, the utility model provides a many shunts current sampling circuit through set up the matching resistance who has great resistance on every reposition of redundant personnel branch road for current diminishes in the sampling circuit, thereby reduces the influence that wire resistance produced in the circuit, reduces the error, improves the precision.
Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.
Claims (8)
1. A multi-shunt current sampling circuit is characterized in that: the sampling compensation resistor in each shunt branch has the same resistance value and is larger than the wire resistance contributed by the wire in the shunt branch, so that when the voltage sampling is carried out on each shunt branch, the voltage on the wire resistance approaches to zero.
2. The multi-shunt current sampling circuit of claim 1, wherein: each shunt branch comprises 2 sampling compensation resistors, and the 2 sampling compensation resistors are distributed on two sides of each shunt resistor.
3. The multi-shunt current sampling circuit of claim 2, wherein: the two sampling compensation resistors have equal resistance values.
4. The multi-shunt current sampling circuit of claim 1, wherein: the power supply branch comprises a constant current source, the negative electrode of the constant current source is grounded, and the positive electrode of the constant current source is connected to a parallel circuit formed by a plurality of shunt resistors.
5. The multi-shunt current sampling circuit of claim 1, wherein: and the two ends of each shunt branch form a voltage acquisition end of the multi-shunt current sampling circuit.
6. A current measuring device, characterized by: the multi-shunt current sampling circuit comprises the multi-shunt current sampling circuit as claimed in any one of claims 1 to 4, a voltage acquisition unit connected to a voltage acquisition end of the multi-shunt current sampling circuit, and a signal processing unit connected to the voltage acquisition unit and used for converting a voltage signal acquired by the voltage acquisition unit into a current signal.
7. The current measuring apparatus of claim 6, wherein: the control unit is connected with and sends control signals to the voltage acquisition unit and the signal processing unit so as to drive the voltage acquisition unit and the signal processing unit to work and receive processing results fed back by the signal processing unit.
8. A battery pack, comprising: the current measuring device according to claim 6 or 7 is provided on the output end of the battery pack.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120366345.4U CN214585665U (en) | 2021-02-08 | 2021-02-08 | Multi-shunt current sampling circuit, current measuring device and battery pack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120366345.4U CN214585665U (en) | 2021-02-08 | 2021-02-08 | Multi-shunt current sampling circuit, current measuring device and battery pack |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214585665U true CN214585665U (en) | 2021-11-02 |
Family
ID=78350816
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120366345.4U Active CN214585665U (en) | 2021-02-08 | 2021-02-08 | Multi-shunt current sampling circuit, current measuring device and battery pack |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214585665U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116449064A (en) * | 2023-03-12 | 2023-07-18 | 深圳市开步电子有限公司 | Shunt, electric equipment and energy storage equipment thereof |
-
2021
- 2021-02-08 CN CN202120366345.4U patent/CN214585665U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116449064A (en) * | 2023-03-12 | 2023-07-18 | 深圳市开步电子有限公司 | Shunt, electric equipment and energy storage equipment thereof |
| CN116449064B (en) * | 2023-03-12 | 2023-10-31 | 深圳市开步电子有限公司 | Shunt, electric equipment and energy storage equipment thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107942251B (en) | Current detection system, method and current detection device | |
| EP1247304B1 (en) | Shunt resistance device for monitoring battery state of charge | |
| CN101256204B (en) | Current detecting device and calibration method | |
| DE102018103310A1 (en) | SENSOR SYSTEM FOR MEASURING THE INTERNAL BATTERY CONDITION | |
| JP2002343445A (en) | Voltage detecting circuit for battery pack | |
| KR20080022486A (en) | Assembled battery total voltage detection and leak detection apparatus | |
| CN214585665U (en) | Multi-shunt current sampling circuit, current measuring device and battery pack | |
| CN103293355B (en) | A kind of tension measuring circuit | |
| CN1168992C (en) | D.C. current sensing device | |
| CN212410750U (en) | Data acquisition device suitable for single-phase earth fault line selection | |
| CN205384360U (en) | BMS current parameter calibrating device | |
| US20230080813A1 (en) | Insulation resistance detection device and forklift truck | |
| KR20230162253A (en) | Battery diagnosis method, battery diagnosis apparatus and battery system providing the same | |
| CN212988630U (en) | Temperature acquisition circuit, control panel and electrical equipment | |
| CN210835070U (en) | Bus duct impedance measuring device | |
| US20110279124A1 (en) | Float current monitor | |
| CN2583682Y (en) | Direct current sensor | |
| CN100570379C (en) | The method of a resistance and converter in the digital multi-purpose meter on-line measurement for loop | |
| CN2563585Y (en) | Electronic meter head pointer indication insulation resistance measurer | |
| CN217787278U (en) | Insulation fault detection device | |
| CN208520923U (en) | Contact impedance measuring device | |
| CN209894872U (en) | Alternating current voltage sampling circuit structure and alternating current voltage detection device | |
| CN218546861U (en) | Voltage detection circuit and energy storage equipment | |
| CN108919141A (en) | A kind of electric car power supply monitoring system | |
| CN212988631U (en) | Temperature acquisition circuit, control panel and electrical equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |