CN113922445A - Current acquisition circuit and method, battery management system, battery pack and electric equipment - Google Patents
Current acquisition circuit and method, battery management system, battery pack and electric equipment Download PDFInfo
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- 238000007599 discharging Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 4
- 238000005070 sampling Methods 0.000 description 15
- 238000010586 diagram Methods 0.000 description 7
- 238000012544 monitoring process Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
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- 238000004364 calculation method Methods 0.000 description 1
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- 238000004590 computer program Methods 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/00714—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery charging or discharging current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
- H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
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Abstract
The embodiment of the application relates to the technical field of battery management, and discloses a current acquisition circuit and a method, a battery management system, a battery pack and electric equipment, wherein the circuit comprises a first current acquisition module and a second current acquisition module, the first current acquisition module is configured to acquire current of a first working state of the current acquisition circuit, the second current acquisition module is configured to acquire current of a second working state of the current acquisition circuit, the current of the first working state is larger than the current of the second working state, and a first switch in the first current acquisition module and a second switch in the second current acquisition module respond to a control signal to execute switching operation so that the current acquisition circuit is in the first working state or the second working state. The current acquisition circuit provided by the embodiment of the application can realize current acquisition under two current working states, and when the current acquisition circuit is applied to a battery pack and a battery management system, the accurate measurement of the current of the battery under different working states can be realized.
Description
Technical Field
The embodiment of the application relates to the technical field of battery management, in particular to a current acquisition circuit and method, a battery management system, a battery pack and electric equipment.
Background
In a battery management system, sampling, monitoring and management of current in a battery pack are necessary, the current sampling is mainly divided into two types according to different principles, one type is to directly acquire the current in a loop by connecting a sampling resistor in series in the loop, and the other type is to use an electromagnetic induction principle, such as detection and measurement by using a mutual inductor.
In the process of implementing the embodiment of the present application, the inventors found that at least the following problems exist in the above related art: at present, a current collection circuit arranged in a battery pack can normally collect current when the battery pack normally works, but under the condition that a battery management system is dormant, if a battery pack does not supply power to a load, the current value obtained by sampling under the influence of zero drift of a sampling resistor is inaccurate when the system is in a low-current working state.
Disclosure of Invention
The embodiment of the application provides a current acquisition circuit and method, a battery management system, a battery pack and electric equipment, which can improve the accuracy of small current sampling.
The purpose of the embodiment of the application is realized by the following technical scheme:
in order to solve the above technical problem, in a first aspect, an embodiment of the present application provides a current collecting circuit, where the current collecting circuit includes a first current collecting module and a second current collecting module. The first current collection module is configured to collect the current of the current collection circuit in a first working state, the second current collection module is configured to collect the current of the current collection circuit in a second working state, and the current of the current collection circuit in the first working state is larger than the current of the current collection circuit in the second working state. The first current collection module comprises a first switch, the second current collection module comprises a second switch, and the first switch and the second switch respond to a control signal to execute switching operation so that the current collection circuit is in the first working state or the second working state respectively.
In some embodiments, when the first switch is turned on in response to the control signal, the second switch is turned off, and the current collection circuit is in the first working state, and when the second switch is turned on in response to the control signal, the first switch is turned off, and the current collection circuit is in the second working state.
In some embodiments, the first acquisition module further comprises a first resistor and a first voltage acquisition unit, and the second acquisition module further comprises a second resistor and a second voltage acquisition unit. The first voltage acquisition unit and the second voltage acquisition unit are used for acquiring the voltage of the first resistor and the voltage of the second resistor, and the first switch and the second switch are electrically connected in the current acquisition circuit in parallel.
In some embodiments, the first voltage acquisition unit and the second voltage acquisition unit comprise analog-to-digital converters. The precision of the analog-to-digital converter of the first voltage acquisition unit is higher than that of the analog-to-digital converter of the second voltage acquisition unit; and/or the resistance value of the first resistor is smaller than that of the second resistor, and the precision of the first resistor is higher than that of the second resistor.
In some embodiments, the current acquisition circuit further comprises a control module. The second voltage acquisition unit is arranged in the control module, and the first voltage acquisition module is electrically connected with the control module; or, the first voltage acquisition unit and the second voltage acquisition unit are both arranged in the control module, and the control module is respectively electrically connected with the first resistor and the second resistor. The first voltage acquisition unit is used for acquiring the voltage of the first resistor, and the first voltage acquisition unit and the second voltage acquisition unit are used for acquiring the voltage of the second resistor.
In some embodiments, the first switch comprises any one of a field effect transistor, an insulated gate bipolar transistor, and a relay, and the second switch comprises any one of a field effect transistor, an insulated gate bipolar transistor, and a relay.
In order to solve the above technical problem, in a second aspect, an embodiment of the present application provides a battery management system, including the current collecting circuit as described in the first aspect.
In order to solve the above technical problem, in a third aspect, an embodiment of the present application provides a battery pack, which includes a battery module and a battery management system as described in the second aspect. The battery module is electrically connected with the battery management system, the battery management system is used for controlling the charging and discharging of the battery module, and the battery module is configured to supply power to the battery management system.
In order to solve the technical problem, in a fourth aspect, an embodiment of the present application further provides an electrical device, including a load and the battery pack as described in the third aspect, where the battery pack is configured to supply power to the load.
In order to solve the above technical problem, in a fifth aspect, an embodiment of the present application further provides a current collecting method, which is applied to the current collecting circuit according to the first aspect. The method comprises the following steps: collecting the current of the current collection circuit through the first current collection module in response to the current collection circuit being in a first working state; or responding to the second working state of the current acquisition circuit, and acquiring the current of the current acquisition circuit through the second current acquisition module.
In some embodiments, the method further comprises: and determining the residual electric quantity of the battery module according to the current acquired by the current acquisition circuit.
Compared with the prior art, the beneficial effect of this application includes: different from the prior art, the embodiment of the present application provides a current collection circuit and a method, a battery management system, a battery pack, and an electric device, where the circuit includes a first current collection module and a second current collection module, the first current collection module is configured to collect a current in a first working state of the current collection circuit, the second current collection module is configured to collect a current in a second working state of the current collection circuit, the current in the first working state is greater than the current in the second working state, and a first switch in the first current collection module and a second switch in the second current collection module execute a switching operation in response to a control signal, so that the current collection circuit is in the first working state or the second working state. The current acquisition circuit provided by the embodiment of the application can realize current acquisition under two current working states, and when the current acquisition circuit is applied to a battery pack and a battery management system, the accurate measurement of the current of the battery under different working states can be realized.
Drawings
One or more embodiments are illustrated by the accompanying figures in the drawings that correspond thereto and are not to be construed as limiting the embodiments, wherein elements/modules and steps having the same reference numerals are represented by like elements/modules and steps, unless otherwise specified, and the drawings are not to scale.
Fig. 1 is a schematic structural diagram of a current collecting circuit according to an embodiment of the present disclosure;
fig. 2 is a schematic circuit structure diagram of a current collecting circuit according to an embodiment of the present disclosure;
fig. 3 is a schematic circuit structure diagram of another current collecting circuit according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of a battery management system according to a second embodiment of the present application;
fig. 5 is a schematic structural diagram of a battery pack according to a third embodiment of the present application;
fig. 6 is a schematic structural diagram of an electric device according to a fourth embodiment of the present application;
fig. 7(a) is a schematic flowchart of a current collection method according to a fifth embodiment of the present application;
fig. 7(b) is a schematic flowchart of a current collection method provided in the fifth embodiment of the present application;
fig. 8 is a schematic flow chart of another current collection method according to the fifth embodiment of the present application.
Detailed Description
The present application will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the present application, but are not intended to limit the present application in any way. It should be noted that various changes and modifications can be made by one skilled in the art without departing from the spirit of the application. All falling within the scope of protection of the present application.
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
It should be noted that, if not conflicted, the various features of the embodiments of the present application may be combined with each other within the scope of protection of the present application. Additionally, while functional block divisions are performed in apparatus schematics, with logical sequences shown in flowcharts, in some cases, steps shown or described may be performed in sequences other than block divisions in apparatus or flowcharts. Further, the terms "first," "second," and the like, as used herein, do not limit the data and the execution order, but merely distinguish the same items or similar items having substantially the same functions and actions. It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may be present.
As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Specifically, the embodiments of the present application will be further explained below with reference to the drawings.
Example one
Referring to fig. 1, which shows a schematic structural diagram of a current collection circuit provided in an embodiment of the present application, the current collection circuit 100 includes a first current collection module 110 and a second current collection module 120.
The first current collection module 110 is configured to collect the current of the current collection circuit 100 in the first working state, the second current collection module 120 is configured to collect the current of the current collection circuit 100 in the second working state, the current of the current collection circuit 100 in the first working state is larger than the current of the current collection circuit 100 in the second working state, the first current collection module 110 includes a first switch S1, the second current collection module 120 includes a second switch S2, and the first switch S1 and the second switch S2 perform a switching operation in response to a control signal to make the current collection circuit 100 in the first working state or the second working state, respectively.
In particular, the current collection circuit 100 provided by the embodiment of the present application can be applied to a current collection circuit in a battery pack. The first working state comprises a working state when the battery pack supplies power for the load, and the second working state comprises a working state when the battery pack does not supply power for the load and is dormant. When the battery pack is in the second working state, part of devices in the battery pack are still in the working state, the battery pack is self-powered, and the current required at the moment is smaller than that in the first working state and is in a low-current working state.
Wherein the first switch S1 includes any one of a field effect transistor, an insulated gate bipolar transistor and a relay, and the second switch S2 includes any one of a field effect transistor, an insulated gate bipolar transistor and a relay.
In some embodiments, when the first switch S1 is turned on in response to the control signal, the second switch S2 is turned off, and the current collection circuit 100 is in the first operating state, and when the second switch S2 is turned on in response to the control signal, the first switch S1 is turned off, and the current collection circuit 100 is in the second operating state.
In some embodiments, please refer to fig. 2, which shows a circuit structure of a current collecting circuit provided in an embodiment of the present application, in which the first collecting module 110 further includes a first resistor R1 and a first voltage collecting unit U1, and the second collecting module 120 further includes a second resistor R2 and a second voltage collecting unit U2. The first voltage collecting unit U1 and the second voltage collecting unit U2 are configured to collect the voltage of the first resistor R1 and the voltage of the second resistor R2, and the first switch S1 and the second switch S2 are electrically connected in parallel to the current collecting circuit 100.
In some embodiments, with continued reference to fig. 2, the first voltage acquisition unit U1 and the second voltage acquisition unit U2 include analog-to-digital converters. The precision of the analog-to-digital converter of the first voltage acquisition unit U1 is higher than that of the analog-to-digital converter of the second voltage acquisition unit U2; and/or the resistance value of the first resistor R1 is smaller than that of the second resistor R2, and the precision of the first resistor R1 is higher than that of the second resistor R2.
As shown in fig. 2, when the battery pack B + is a lithium-ion battery pack, the resistance value of the first resistor R1 may be set to be in a range of 0.1 to 10 milliohms, and the resistance value of the second resistor R2 may be set to be in a range of 10 to 100 ohms. For example, when the first resistor R1 is a high-precision current sampling Sensor (Sensor) resistor (precision ± 1%) and the resistance is 10m Ω, the Analog-to-Digital Converter (ADC) in the first voltage acquisition unit U1 is a 16-bit high-precision Analog-to-Digital Converter, the reference voltage is 5V, and the current acquisition range is: the identification precision is 5000 mV/10 m omega-500A, the identification precision is 5000mV/2^16 ^ 0.0763mV, the current sampling precision is 0.0763mV/5000mV 500A ^ 1000 ^ 7.63mA, and when the actual small current is 10mA, the final collection value is 10mA +/-7.6 mA; the second resistor R2 is a pre-charge resistor with a precision of 5%, when the resistance is 50 Ω, the Analog-to-Digital Converter in the second voltage acquisition unit U2 is a 12-bit high-precision Analog-to-Digital Converter (ADC), the reference voltage is 5V, and the current acquisition range is as follows: the identification precision is 5000mV/2^12 ^ 1.2207mV, and the current sampling precision is 1.2207mV/5000mV 0.1A ^ 1000 ^ 0.0244 mA; assuming that the resistance deviation of the second resistor R2 is 5% at most, taking the actual small current of 10mA as an example, the deviation of the collected voltage is: 10mA 5% 50 Ω 25mV, the corresponding current deviation is: 25mV/1.2207mV 0.0244mA 0.5mA, i.e. when the actual small current is 10mA, even with a maximum 5% deviation of the second resistance R2, the final collection value is 10mA ± 0.5 mA.
Specifically, the system current is equal to the ratio of the differential voltage to the resistance value, referring to fig. 2, the first voltage acquisition unit U1 is configured to acquire the voltage at the right end of the first resistor R1, wherein an analog-to-digital converter in the first voltage acquisition unit U1 is capable of converting an analog signal of the acquired voltage into a digital signal; then, the first voltage acquisition unit U1 sends the detected voltage at the right end of the first resistor R1 to the second voltage sampling unit U2 through the clock line SCL; next, the second voltage acquisition unit U2 is configured to acquire a voltage at the right end of the second resistor R2, where an analog-to-digital converter in the second voltage acquisition unit U2 is capable of converting an analog signal of the acquired voltage into a digital signal; finally, the second voltage acquisition unit U2 can obtain a difference between the voltage at the right end of the first resistor R1 and the voltage at the right end of the second resistor R2, thereby obtaining a differential voltage of the second resistor R2, and calculate a system current in the second working state according to the differential voltage of the second resistor R2 and the resistance value of the second resistor R2.
The first voltage acquisition Unit U1 and the second voltage acquisition Unit U2 may be microprocessors, which are an operation core and a control core with calculation capability and control capability, and may include a memory and a controller, for example, a Micro Control Unit (MCU), which is also called a Single Chip Microcomputer (Single Chip Microcomputer), or a Single Chip Microcomputer (MCU), and may be specifically selected according to actual needs.
In some embodiments, with continued reference to fig. 2, the current collection circuit 100 further includes a control module 130; the second voltage acquisition unit U2 is arranged in the control module 130, and the first voltage acquisition unit U1 is electrically connected with the control module 130; or, please refer to fig. 3, which shows another circuit structure of the current collecting circuit provided in the embodiment of the present application, wherein the first voltage collecting unit U1 and the second voltage collecting unit U2 are both disposed in the control module 130, the control module 130 is electrically connected to the first resistor R1 and the second resistor R2, respectively, the first voltage collecting unit U1 is configured to collect the voltage of the first resistor R1, and the first voltage collecting unit U1 and the second voltage collecting unit U2 are configured to collect the voltage of the second resistor R2.
The control module 130 is configured to control on and off of the first switch S1 and the second switch S2. When the first voltage acquisition unit U1 and the second voltage acquisition unit U2 are electrically connected, the electrical connection may be achieved through a communication bus, for example, as shown in fig. 2, the connection may be achieved through an Inter-Integrated Circuit (I2C) bus, in some other embodiments, the connection may be achieved through another communication bus, or through another electrical connection method such as a socket, and specifically, may be set according to actual needs.
Example two
Referring to fig. 4, which shows a structure of a battery management system provided in an embodiment of the present application, the battery management system 200 includes the current collecting circuit 100 according to the first embodiment.
The battery management system 200 is configured to control the current sampling circuit 100 according to the operating state of the battery or the battery pack or the battery module, so as to realize the current collection of the battery through the current sampling circuit 100 in different operating states of the battery.
Further, the battery management system 200 may also be configured to perform other data collection and monitoring management on the battery or the battery pack or the battery module, for example, insulation resistance, voltage data, electric quantity data, and the like, which may be specifically set according to actual needs.
EXAMPLE III
Referring to fig. 5, a structure of a battery pack provided in an embodiment of the present application is shown, where the battery pack 300 includes a battery module 310 and a battery management system 200 as described in the second embodiment, where the battery module 310 is electrically connected to the battery management system 200, the battery management system 200 is used for controlling charging and discharging of the battery module 310, and the battery module 310 is configured to supply power to the battery management system 200.
The battery module 310 includes a positive electrode and a negative electrode, the battery module 310 includes at least one battery, and the battery module 310 may be a lithium battery, a lead-acid battery, or the like, and may be specifically selected according to actual needs. The battery module 310 is configured to supply power to a load 410, and the battery management system 200 is connected between the battery pack 310 and the load 410 and configured to sample the current of the battery module 310 in various operating states.
Example four
Referring to fig. 6, which shows a structure of an electric device provided in an embodiment of the present application, the electric device 400 includes a load 410 and a battery pack 300 as described in the third embodiment, where the battery pack 300 is used to supply power to the load 410.
The electric device 400 is a device using the battery pack 300 as a power source, and the load 410 is driven by the battery pack 300.
EXAMPLE five
An embodiment of the present application provides a current collection method, which can be applied to a current collection circuit as described in the first embodiment, please refer to fig. 7(a) and fig. 7(b), which illustrate a flow of the current collection method provided in the embodiment of the present application, where the method includes, but is not limited to, the following steps:
step S1: collecting the current of the current collection circuit through the first current collection module in response to the current collection circuit being in a first working state;
in the embodiment of the application, the current sampling circuit can switch different current collection modes according to different working states, and when the current collection circuit is in a first working state, the current of the current collection circuit is collected through a first current sampling module in the current collection circuit. Specifically, the first operating state may be a current operating state in which the load normally operates.
Step S2: and responding to the second working state of the current acquisition circuit, and acquiring the current of the current acquisition circuit through the second current acquisition module.
And when the current acquisition circuit is in a second working state, acquiring the current of the current acquisition circuit through a second current sampling module in the current acquisition circuit. Specifically, the second operating state is a current operating state in a non-load connected and sleep state.
In some embodiments, please refer to fig. 8, which illustrates a flow of another current collecting method provided in the embodiments of the present application, the method further includes:
step S3: and determining the residual electric quantity of the battery module according to the current acquired by the current acquisition circuit.
In the embodiment of the application, the current data acquired by the current acquisition module is used for monitoring and managing the battery module, for example, the electric quantity of the battery module can be managed, and specifically, the state of charge of the battery module in the system can be determined by an ampere-hour integration method according to the change condition of the current along with time.
The embodiment of the application provides a current acquisition circuit and method, a battery management system, a battery pack and electric equipment, the circuit comprises a first current acquisition module and a second current acquisition module, the first current acquisition module comprises a first resistance unit and a first voltage acquisition unit, the first current acquisition module is configured to acquire current of a first working state of the current acquisition circuit, the second current acquisition module is configured to acquire current of a second working state of the current acquisition circuit, the current of the first working state is larger than the current of the second working state, and a first switch in the first current acquisition module and a second switch in the second current acquisition module respond to a control signal to execute switching operation so that the current acquisition circuit is in the first working state or the second working state. The current acquisition circuit provided by the embodiment of the application can realize current acquisition under two current working states, and when the current acquisition circuit is applied to a battery pack and a battery management system, the accurate measurement of the current of the battery under different working states can be realized.
It should be noted that the above-described device embodiments are merely illustrative, where the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a general hardware platform, and certainly can also be implemented by hardware. It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware related to instructions of a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; within the context of the present application, where technical features in the above embodiments or in different embodiments can also be combined, the steps can be implemented in any order and there are many other variations of the different aspects of the present application as described above, which are not provided in detail for the sake of brevity; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Claims (11)
1. A current acquisition circuit is characterized by comprising a first current acquisition module and a second current acquisition module,
the first current acquisition module is configured to acquire the current of the current acquisition circuit in a first working state, the second current acquisition module is configured to acquire the current of the current acquisition circuit in a second working state, and the current of the current acquisition circuit in the first working state is larger than the current of the current acquisition circuit in the second working state;
the first current collection module comprises a first switch, the second current collection module comprises a second switch, and the first switch and the second switch respond to a control signal to execute switching operation so that the current collection circuit is in the first working state or the second working state respectively.
2. The current-collecting circuit of claim 1, wherein when said first switch is turned on in response to said control signal, said second switch is turned off, said current-collecting circuit is in a first operating state, and when said second switch is turned on in response to said control signal, said first switch is turned off, said current-collecting circuit is in a second operating state.
3. The current collection circuit of claim 1 or 2, wherein the first collection module further comprises a first resistor and a first voltage collection unit, the second collection module further comprises a second resistor and a second voltage collection unit,
the first voltage acquisition unit and the second voltage acquisition unit are used for acquiring the voltage of the first resistor and the voltage of the second resistor, and the first switch and the second switch are electrically connected in the current acquisition circuit in parallel.
4. The current acquisition circuit of claim 3, wherein the first voltage acquisition unit and the second voltage acquisition unit comprise analog-to-digital converters,
the precision of the analog-to-digital converter of the first voltage acquisition unit is higher than that of the analog-to-digital converter of the second voltage acquisition unit; and/or the presence of a gas in the gas,
the resistance value of the first resistor is smaller than that of the second resistor, and the precision of the first resistor is higher than that of the second resistor.
5. The current acquisition circuit of claim 3, further comprising a control module;
the second voltage acquisition unit is arranged in the control module, and the first voltage acquisition module is electrically connected with the control module; or the first voltage acquisition unit and the second voltage acquisition unit are both arranged in the control module, the control module is respectively electrically connected with the first resistor and the second resistor,
the first voltage acquisition unit is used for acquiring the voltage of the first resistor, and the first voltage acquisition unit and the second voltage acquisition unit are used for acquiring the voltage of the second resistor.
6. The current collection circuit of claim 3, wherein the first switch comprises any one of a field effect transistor, an insulated gate bipolar transistor, and a relay, and wherein the second switch comprises any one of a field effect transistor, an insulated gate bipolar transistor, and a relay.
7. A battery management system comprising a current acquisition circuit according to any of claims 1 to 6.
8. A battery pack comprising battery modules and the battery management system of claim 7, wherein the battery modules are electrically connected to the battery management system, the battery management system is configured to control charging and discharging of the battery modules, and the battery modules are configured to supply power to the battery management system.
9. An electrical device comprising a load and the battery pack of claim 8, wherein the battery pack is configured to power the load.
10. A current collection method applied to the current collection circuit according to any one of claims 1 to 6, the method comprising:
collecting the current of the current collection circuit through the first current collection module in response to the current collection circuit being in a first working state; or the like, or, alternatively,
and responding to the second working state of the current acquisition circuit, and acquiring the current of the current acquisition circuit through the second current acquisition module.
11. The method of current collection according to claim 10, further comprising:
and determining the residual electric quantity of the battery module according to the current acquired by the current acquisition circuit.
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| CN202111123843.7A CN113922445A (en) | 2021-09-24 | 2021-09-24 | Current acquisition circuit and method, battery management system, battery pack and electric equipment |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009150762A (en) * | 2007-12-20 | 2009-07-09 | Fujitsu Telecom Networks Ltd | Current measuring device |
| CN207067227U (en) * | 2017-08-03 | 2018-03-02 | 深圳市昂盛达电子有限公司 | Sample circuit and current measurement circuit |
| WO2020155068A1 (en) * | 2019-01-31 | 2020-08-06 | 华为技术有限公司 | Current measuring device, method, and apparatus |
| CN212134804U (en) * | 2020-03-12 | 2020-12-11 | 深圳市昂盛达电子有限公司 | Current double-circuit sampling circuit |
| CN212965126U (en) * | 2020-07-23 | 2021-04-13 | 北京罗克维尔斯科技有限公司 | Two-gear current detection circuit |
-
2021
- 2021-09-24 CN CN202111123843.7A patent/CN113922445A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009150762A (en) * | 2007-12-20 | 2009-07-09 | Fujitsu Telecom Networks Ltd | Current measuring device |
| CN207067227U (en) * | 2017-08-03 | 2018-03-02 | 深圳市昂盛达电子有限公司 | Sample circuit and current measurement circuit |
| WO2020155068A1 (en) * | 2019-01-31 | 2020-08-06 | 华为技术有限公司 | Current measuring device, method, and apparatus |
| CN212134804U (en) * | 2020-03-12 | 2020-12-11 | 深圳市昂盛达电子有限公司 | Current double-circuit sampling circuit |
| CN212965126U (en) * | 2020-07-23 | 2021-04-13 | 北京罗克维尔斯科技有限公司 | Two-gear current detection circuit |
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