CN110712561B - Battery management system and electric automobile - Google Patents
Battery management system and electric automobile Download PDFInfo
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- CN110712561B CN110712561B CN201910979919.2A CN201910979919A CN110712561B CN 110712561 B CN110712561 B CN 110712561B CN 201910979919 A CN201910979919 A CN 201910979919A CN 110712561 B CN110712561 B CN 110712561B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
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- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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Abstract
The invention belongs to the technical field of battery management, and relates to a battery management system and an electric automobile. Wherein, battery management system includes: the device comprises a front-end current acquisition module, a front-end voltage acquisition module and a controller. The front-end current acquisition module and the front-end voltage acquisition module are connected with the controller through data transmission interfaces. The front-end current acquisition module is used for acquiring current data according to a preset current acquisition cycle. The front end voltage acquisition module is used for acquiring voltage data according to a preset voltage acquisition cycle. The controller is used for storing the latest updating current data acquired from the front-end current acquisition module and the updating voltage data in a correlation mode when receiving the updating voltage data acquired and transmitted by the front-end voltage acquisition module. Therefore, the method and the device can ensure that the initial acquisition time corresponding to the update voltage data and the update current data which are stored in a correlated manner is synchronous, so that the method and the device can ensure the calculation accuracy of each parameter of the power battery.
Description
Technical Field
The invention relates to the technical field of battery management, in particular to a battery management system and an electric automobile.
Background
The electric automobile is a new direction for future automobile development, wherein the battery management technology is an important component of the core technology of the electric automobile. In the battery management technology of the electric vehicle, the collection of current data and the collection of voltage data are indispensable operations. The reliability of the current data acquisition and calculation and/or the reliability of the voltage data acquisition and calculation can directly influence the accuracy of the battery SOC (State of Charge) and the driving safety of the electric vehicle.
At present, the conventional battery management system acquires current data periodically from the current acquisition front end through the CVS module and stores the current data in its memory, the BMU (or called, battery management controller) periodically acquires the current data from the memory of the CVS module by Can communication, however, in the conventional battery management system, the BMU acquires the voltage data from the voltage acquisition front end by SPI communication directly, therefore, the reference time of the conventional battery management system is not consistent when acquiring the voltage data and the current data, and in addition, because the current update cycle and the voltage update cycle of the power battery are usually inconsistent, the problem that the update voltage data and the update current data of the power battery acquired by a traditional battery management system are not synchronous in time exists, and the accuracy of calculation of each parameter of the power battery is influenced.
In view of the above problems, those skilled in the art have sought solutions.
The foregoing description is provided for general background information and is not admitted to be prior art.
Disclosure of Invention
The invention provides a battery management system and an electric automobile, and aims to solve the problem that time is asynchronous between update voltage data and update current data of a power battery acquired by a BMU (battery management unit), and guarantee the accuracy of calculation of each parameter of the power battery.
The invention provides a battery management system, comprising: the device comprises a front-end current acquisition module, a front-end voltage acquisition module and a controller. The front-end current acquisition module and the front-end voltage acquisition module are connected with the controller through data transmission interfaces. The front-end current acquisition module is used for acquiring current data according to a preset current acquisition cycle. The front end voltage acquisition module is used for acquiring voltage data according to a preset voltage acquisition cycle. The controller is used for storing the latest updating current data acquired from the front-end current acquisition module and the updating voltage data in a correlation mode when receiving the updating voltage data acquired and transmitted by the front-end voltage acquisition module.
Further, still include power battery. The power battery is connected with the front-end current acquisition module and the front-end voltage acquisition module. The current updating period of the power battery, the voltage updating period of the power battery, the preset current collecting period and the preset voltage collecting period are all multiples of the preset duration.
Further, the preset current collection period is 5ms, and the preset voltage collection period is 10 ms. The current updating period of the power battery connected with the front-end current acquisition module and the front-end voltage acquisition module is 10ms, and the voltage updating period of the power battery is 100 ms.
Further, the data transmission interface is an SPI interface.
Furthermore, the front-end current collection module comprises a current divider and a current collector. The current collector comprises a first current collecting channel and a second current collecting channel, and the first current collecting channel and the second current collecting channel are both connected with the current divider.
Further, the front-end current collection module further comprises a processor. The processor is used for acquiring current data according to the current value acquired by the first current acquisition channel and the current value acquired by the second current acquisition channel.
Further, the processor includes a computing unit. The calculating unit is used for calculating the average value of the current value acquired by the first current acquisition channel and the current value acquired by the second current acquisition channel so as to acquire current data.
Furthermore, the front-end voltage acquisition module comprises a plurality of voltage acquisition units, each voltage acquisition unit supports an external loop of the communication line and an internal loop of the communication line, and the plurality of voltage acquisition units are connected in a daisy chain manner. The controller is connected with the voltage acquisition unit at the head end of the front end voltage acquisition module in a daisy chain mode, and is also used for controlling the voltage acquisition units on the daisy chain to carry out communication fault point inspection in a mode of switching the external loop and the internal loop one by one when communication faults occur on the daisy chain.
Further, the controller is configured to, when a communication fault occurs on the daisy chain, control an nth voltage acquisition unit on the daisy chain to perform internal loop switching, send a test command to the voltage acquisition unit at the head end, determine that a communication fault point exists on the daisy chain after the nth voltage acquisition unit when a return result corresponding to the test command is received, determine that a communication fault point exists on the daisy chain before the nth voltage acquisition unit when the return result is not received, control the voltage acquisition units before the nth voltage acquisition unit one by one to switch to the internal loop, and send a retest command to perform a communication test until a specific position of the communication fault point is determined, where N is the number of the plurality of voltage acquisition modules.
The invention also provides an electric automobile comprising the battery management system.
The invention provides a battery management system and an electric automobile, wherein the battery management system comprises: the device comprises a front-end current acquisition module, a front-end voltage acquisition module and a controller. The front-end current acquisition module and the front-end voltage acquisition module are connected with the controller through data transmission interfaces. The front-end current acquisition module is used for acquiring current data according to a preset current acquisition cycle. The front end voltage acquisition module is used for acquiring voltage data according to a preset voltage acquisition cycle. The controller is used for storing the latest updating current data acquired from the front-end current acquisition module and the updating voltage data in a correlation mode when receiving the updating voltage data acquired and transmitted by the front-end voltage acquisition module. Therefore, the front-end current acquisition module and the front-end voltage acquisition module are directly connected with the controller through the data transmission interface, so that the consistency of reference time when the front-end current acquisition module and the front-end voltage acquisition module acquire data can be guaranteed, and the acquired latest updating current data can be stored in a correlated manner when the controller receives the updating voltage data, so that the synchronization of the initial acquisition time corresponding to the updated voltage data and the updated current data stored in a correlated manner can be guaranteed, and the accuracy of calculation of each parameter of the power battery can be guaranteed.
Drawings
Fig. 1 is a schematic structural diagram of a battery management system according to a first embodiment of the present invention;
fig. 2 is a schematic structural diagram of a front-end current collecting module according to a second embodiment of the present invention;
fig. 3 is a schematic diagram of a daisy chain configuration of a battery management system according to a third embodiment of the present invention. .
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiments of the present invention will be described in detail with reference to the accompanying drawings.
The first embodiment:
fig. 1 is a schematic structural diagram of a battery management system according to a first embodiment of the present invention. For a clear description of the battery management system according to the first embodiment of the present invention, please refer to fig. 1.
A battery management system according to a first embodiment of the present invention includes: the device comprises a front-end current acquisition module A, a front-end voltage acquisition module B and a controller C.
The front-end current acquisition module A and the front-end voltage acquisition module B are connected with the controller C through data transmission interfaces.
In an embodiment, the data transmission interface may include, but is not limited to, a wired data transmission interface and a wireless data transmission interface. The wired data transmission interface may include, but is not limited to, an SPI interface, an SSI interface, and the like.
In an embodiment, the data transmission interface in the battery management system provided in this embodiment is preferably an SPI interface.
The front-end current acquisition module A is used for acquiring current data according to a preset current acquisition cycle.
In one embodiment, the front end current collection module a may include, but is not limited to, a shunt a1 and a current collector a 2. The current collector A2 includes a first current collecting channel a201 and a second current collecting channel a202, both the first current collecting channel a201 and the second current collecting channel a202 being connected to the shunt a 1. Therefore, the shunt a1 can ensure that the current flowing through the first current collecting channel a201 is equal to or close to equal to the current flowing through the second current collecting channel a202, and further, when the first current collecting channel a201 or the second current collecting channel a202 in the front-end current collecting module a fails or fails, the battery management system provided by this embodiment can still ensure that the controller C obtains reliable current data.
In an embodiment, the front-end current collecting module a may transmit the current value collected by the first current collecting channel a201 and the current value collected by the second current collecting channel a202 to the controller C, so that the controller C calculates an average value of the current value collected by the first current collecting channel a201 and the current value collected by the second current collecting channel a202 to obtain the current data. Therefore, the present embodiment can secure the reliability of the current data acquired by the controller C.
In one embodiment, the front-end current collecting module a includes a current collector a2 including a current collecting chip. The type of the current collecting chip can be but is not limited to LTC 2949.
The front end voltage acquisition module B is used for acquiring voltage data according to a preset voltage acquisition cycle.
In an embodiment, the front end voltage acquisition module B may include, but is not limited to, a plurality of voltage acquisition units, the voltage acquisition units are connected in a daisy chain manner, and the voltage acquisition unit at the front end of the front end voltage acquisition module B is connected in a daisy chain manner with the controller C.
In one embodiment, the front-end voltage module may include, but is not limited to, a voltage acquisition chip. The type of the voltage acquisition chip can be but is not limited to M17853.
In one embodiment, the data acquisition operations of the front-end voltage acquisition module B and the front-end current acquisition module a may be triggered by the controller C.
The controller C is configured to perform associated storage on the latest update current data acquired from the front-end current acquisition module a and the update voltage data when receiving the update voltage data acquired and transmitted by the front-end voltage acquisition module B.
In an embodiment, controller C may include, but is not limited to including, a BMU. The BMU may include a main control chip therein. The model of the master control chip may be, but is not limited to, MPC 5746R.
In an embodiment, the battery management system provided in this embodiment may further include a power battery. The power battery is connected with the front-end current acquisition module A and the front-end voltage acquisition module B. The current updating period of the power battery, the voltage updating period of the power battery, the preset current collecting period and the preset voltage collecting period are all multiples of the preset duration.
In one embodiment, the preset time period may be 5 ms. Specifically, the preset current collection period may be 5ms, and the preset voltage collection period may be 10 ms. The current update cycle of the power battery connected with the front-end current acquisition module a and the front-end voltage acquisition module B may be 10ms, and the voltage update cycle of the power battery may be 100 ms.
In an embodiment, specifically, since the preset current collection period is 5ms and the current update period of the power battery is 10ms, when the front-end current collection module a collects current data, the current data is collected every two preset current collection periods, so that the front-end current collection module a can transmit the current data to the controller C.
In one embodiment, specifically, since the preset voltage acquisition period is 10ms and the voltage update period of the power battery is 100ms, the update voltage data is acquired every ten preset voltage acquisition periods when the front-end voltage acquisition module B acquires the voltage data, so that the front-end voltage acquisition module B can transmit the update voltage data to the controller C.
In one embodiment, the controller C may send the update voltage data and the update current data stored in association to the application layer, so that the software of the application layer can acquire the update current data associated therewith while reading the update voltage data.
A battery management system according to a first embodiment of the present invention includes: the device comprises a front-end current acquisition module A, a front-end voltage acquisition module B and a controller C. The front-end current acquisition module A and the front-end voltage acquisition module B are both connected with the controller C through a data transmission interface. The front-end current acquisition module A is used for acquiring current data according to a preset current acquisition cycle. The front end voltage acquisition module B is used for acquiring voltage data according to a preset voltage acquisition cycle. And the controller C is used for storing the latest updated current data acquired from the front-end current acquisition module A and the updated voltage data in a correlation manner when receiving the updated voltage data acquired and transmitted by the front-end voltage acquisition module B. Therefore, the front-end current collection module a and the front-end voltage collection module B in the battery management system provided in the first embodiment of the present invention are both directly connected to the controller C through the data transmission interface, which can ensure that the reference time of the front-end current collection module a and the reference time of the front-end voltage collection module B during data collection are consistent, and when the controller C receives the updated voltage data, the obtained latest updated current data can be stored in an associated manner, so that the initial collection time corresponding to the updated voltage data and the updated current data stored in an associated manner can be ensured to be synchronous, and therefore, the battery management system provided in the first embodiment of the present invention can ensure the accuracy of calculation of each parameter of the power battery.
Second embodiment:
fig. 2 is a schematic structural diagram of a front-end current collection module according to a second embodiment of the present invention. For a clear description of the battery management system according to the second embodiment of the present invention, please refer to fig. 2.
A battery management system according to a second embodiment of the present invention includes: the device comprises a front-end current acquisition module A, a front-end voltage acquisition module B and a controller C.
Specifically, for the specific implementation and beneficial effects of the front-end voltage acquisition module B and the controller C, reference may be made to the battery management system according to the first embodiment of the present invention, which will not be described herein again.
The front-end current acquisition module A is used for acquiring current data according to a preset current acquisition cycle.
In one embodiment, the front end current collection module a includes a shunt a1 and a current collector a 2. The current collector A2 includes a first current collecting channel a201 and a second current collecting channel a202, both the first current collecting channel a201 and the second current collecting channel a202 being connected to the shunt a 1. Therefore, the shunt a1 can ensure that the current flowing through the first current collecting channel a201 is equal to or close to equal to the current flowing through the second current collecting channel a202, and further, when the first current collecting channel a201 or the second current collecting channel a202 in the front-end current collecting module a fails or fails, the battery management system provided by this embodiment can still ensure that the controller C obtains reliable current data.
In one embodiment, the first end of the first current collecting channel a201 is connected to the positive terminal of the shunt a1, the second end of the first current collecting channel a201 is connected to the negative terminal of the shunt a1, the first end of the second current collecting channel a202 is connected to the negative terminal of the shunt a1, and the second end of the second current collecting channel a202 is connected to the positive terminal of the shunt a 1.
In one embodiment, the first end of the first current collecting channel a201 may be an input end, and the second end of the first current collecting channel a201 may be an output end. The first end of the second current collecting channel a202 may be an output end, and the second end of the second current collecting channel a202 may be an input end.
In other embodiments, the first end of the first current collection channel a201 may be an input end, and the second end of the first current collection channel a201 may be an output end. The first end of the second current collecting channel a202 may be an input end, and the second end of the second current collecting channel a202 may be an output end. Therefore, the second current collecting channel a202 is connected with the shunt a1 in a positive and negative reverse connection manner, so that under normal conditions, the current collected by the first current collecting channel a201 is the same as or similar to the current collected by the second current collecting channel a202, and the current directions are opposite, and further, which current collecting channel is in fault or failure can be conveniently determined through the positive and negative reverse connection manner.
In an embodiment, the front-end current collecting module a may transmit the current value collected by the first current collecting channel a201 and the current value collected by the second current collecting channel a202 to the controller C, so that the controller C calculates an average value according to the current value collected by the first current collecting channel a201 and the current value collected by the second current collecting channel a202 to obtain the current data. Therefore, the present embodiment can secure the reliability of the current data acquired by the controller C.
In other embodiments, the front-end current collection module a may further include, but is not limited to, a processor. The processor is used for acquiring current data according to the current value acquired by the first current acquisition channel A201 and the current value acquired by the second current acquisition channel A202.
In other embodiments, the processor includes a computational unit. The calculating unit is used for calculating the average value of the current value acquired by the first current acquisition channel A201 and the current value acquired by the second current acquisition channel A202 to acquire current data. Therefore, in other embodiments of the present embodiment, the reliability of the current data acquired by the controller C can be ensured.
The current collector A2 in the battery management system according to the second embodiment of the present invention includes the first current collection channel a201 and the second current collection channel a202, which can ensure the reliability and stability of current data, and therefore, the battery management system according to the second embodiment of the present invention can ensure that the initial collection time corresponding to the update voltage data and the update current data stored in association with each other is synchronous, and therefore, the battery management system according to the first embodiment of the present invention can ensure the accuracy of calculation of each parameter of the power battery.
The third embodiment:
fig. 3 is a schematic diagram of a daisy chain configuration of a battery management system according to a third embodiment of the present invention. For a clear description of the battery management system according to the third embodiment of the present invention, please refer to fig. 3. It should be noted that the dotted line portion inside the voltage acquisition unit B101 in fig. 3 represents an internal communication link.
A battery management system according to a third embodiment of the present invention includes: the device comprises a front-end current acquisition module A, a front-end voltage acquisition module B and a controller C.
Specifically, the battery management system according to the third embodiment of the present invention is different from the battery management system according to the first embodiment of the present invention or the battery management system according to the second embodiment of the present invention in that it further has a communication failure point check function.
Specifically, the front-end voltage acquisition module B may include a plurality of voltage acquisition units B101, each of the voltage acquisition units B101 supporting an outer loop of the communication line and an inner loop of the communication line, and the plurality of voltage acquisition units B101 are connected in a daisy chain manner. The controller C is connected with the voltage acquisition unit B101 at the head end of the front end voltage acquisition module B in a daisy chain manner.
Specifically, the controller C may be further configured to control the voltage acquisition units B101 on the daisy chain to perform communication fault point check in a manner of switching between the outer loop and the inner loop one by one when a communication fault occurs on the daisy chain.
In an embodiment, the voltage acquisition unit B101 supports an external loop of a communication line and an internal loop of the communication line, that is, during data communication, an internal link of the voltage acquisition unit B101 may perform signal transmission, or two serial ports corresponding to the voltage acquisition unit B101 may be connected by a communication line to form an external loop for communication.
It should be noted that, when a communication fault is caused by a single-point failure or a multi-point failure at a certain position on a daisy chain formed by the controller C and the voltage acquisition unit B101, the controller C cannot acquire voltage data of the power battery due to the communication fault, and at this time, the system will take an operation of disconnecting the relay to cause power loss. Thus, even if a certain part on the communication line fails, the battery management system of the embodiment can still communicate with the voltage acquisition unit B101 before the failure point, acquire voltage data of the relevant single battery cell to determine whether to turn off the relay or to select to reduce power, and meanwhile, can also quickly locate the position of the communication failure point.
In an embodiment, the controller C may be further configured to, when a communication fault occurs on the daisy chain, control the nth voltage acquisition unit B101 on the daisy chain to perform internal loop switching, and then send a test command to the voltage acquisition unit B101 at the head end, determine that a communication fault point exists on the daisy chain after the nth voltage acquisition unit B101 when a return result corresponding to the test command is received, determine that a communication fault point exists on the daisy chain before the nth voltage acquisition unit B101 when the return result is not received, and send a retest command to perform a communication test after the voltage acquisition units B101 before the nth voltage acquisition unit B101 are controlled one by one to switch to the internal loop until a specific position of the communication fault point is determined, where N is the number of the plurality of voltage acquisition modules.
Specifically, the embodiment expresses that the detection of the communication fault point may be started from any position on the daisy chain, for example, when there are 8 voltage acquisition units B101, when fault communication occurs, the controller C controls the 5 th voltage acquisition unit B101 in the middle to perform internal loop switching, at this time, the communication line is transmitted through the internal communication link of the 5 th voltage acquisition unit B101 at the 5 th voltage acquisition unit B101, and does not continue to go through the external communication line after the 5 th voltage acquisition unit B101, on one hand, if the communication is normal at this time, it means that the external communication line before the controller C to the 5 th voltage acquisition unit B101 is normal, that is, the communication fault point appears on the external communication line after the 5 th voltage acquisition unit B101, at this time, when next detection is performed, the internal loop setting of the 5 th voltage acquisition unit B101 needs to be cleared first, then, the same setting is performed on the other voltage acquisition units B101 after the 5 th voltage acquisition unit B101, and it should be noted that, of course, the subsequent detection may be sequentially checked one by one, or may be performed in a jump manner, that is, the detection is not limited to be performed in the order of 6 th to 7 th to 8 th. On the other hand, if the controller C does not receive the return result corresponding to the test command after performing the internal loop setting on the 5 th voltage acquisition unit B101 and when performing the communication test by sending the test command, it indicates that there is a communication fault point on the external communication line before the 5 th voltage acquisition unit B101, and then performs the same setting on the other voltage acquisition units B101 before the 5 th voltage acquisition unit B101 until the specific position of the communication fault point can be determined, where in the subsequent detection process, it is not required to clear the internal loop setting of the 5 th voltage acquisition unit B101 first, because the communication fault point is before the communication fault point, the internal loop setting of the voltage acquisition unit B101 after the fault point does not affect the subsequent detection, and certainly, after the communication fault point is recovered, the clearing is required. It should be noted that the test in the detection process is generally performed by checking the number of the voltage acquisition units B101, and the value returned by the test command is the number of the corresponding voltage acquisition units B101, for example, when the 5 th voltage acquisition unit B101 performs the test, the value returned by the test command is 5.
The battery management system provided by the third embodiment of the invention not only can ensure the calculation accuracy of each parameter of the power battery, but also can have the function of detecting a communication fault point of the front-end voltage acquisition module.
The fourth embodiment:
the fourth embodiment of the present invention also provides an electric vehicle including the battery management system described in the first, second, or third embodiment.
According to the electric automobile provided by the fourth embodiment of the invention, the calculation accuracy of each parameter of the power battery can be ensured through the battery management system, so that the safety of the electric automobile can be ensured.
As used herein, the ordinal adjectives "first", "second", etc., used to describe an element are merely to distinguish between similar elements and do not imply that the elements so described must be in a given sequence, either temporally, spatially, in ranking, or in any other manner.
As used herein, the meaning of "a plurality" or "a plurality" is two or more unless otherwise specified.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
As used herein, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, including not only those elements listed, but also other elements not expressly listed.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (9)
1. A battery management system, comprising: the device comprises a front-end current acquisition module, a front-end voltage acquisition module, a controller and a power battery;
the front-end current acquisition module and the front-end voltage acquisition module are connected with the controller through data transmission interfaces, so that the controller directly controls the front-end current acquisition module and the front-end voltage acquisition module to have consistent reference time during data acquisition;
the front-end current acquisition module comprises a shunt and a current collector, wherein two current acquisition channels of the current collector are both connected with the shunt, and one of the two current acquisition channels is connected with the shunt in a positive-negative reverse connection mode so as to acquire current data of the power battery according to a preset current acquisition cycle;
the front end voltage acquisition module is used for acquiring voltage data of the power battery according to a preset voltage acquisition cycle;
the preset current acquisition period is shorter than the preset voltage acquisition period, and the preset current acquisition period and the preset voltage acquisition period are set based on the characteristic that the current update period of the power battery is shorter than the voltage update period;
and the controller is used for storing the latest updating current data acquired from the front-end current acquisition module and the updating voltage data in a correlation manner when receiving the updating voltage data acquired and transmitted by the front-end voltage acquisition module.
2. The battery management system of claim 1,
the power battery is connected with the front-end current acquisition module and the front-end voltage acquisition module;
the current updating period of the power battery, the voltage updating period of the power battery, the preset current collecting period and the preset voltage collecting period are all multiples of preset duration.
3. The battery management system according to claim 1 or 2, wherein the preset current collection period is 5ms, and the preset voltage collection period is 10 ms;
the current updating period of the power battery connected with the front-end current acquisition module and the front-end voltage acquisition module is 10ms, and the voltage updating period of the power battery is 100 ms.
4. The battery management system of claim 1, wherein the data transmission interface is an SPI interface.
5. The battery management system of claim 1, wherein the front-end current acquisition module further comprises a processor, and the two current acquisition channels of the current collector are a first current acquisition channel and a second current acquisition channel, respectively;
the processor is used for acquiring current data according to the current value acquired by the first current acquisition channel and the current value acquired by the second current acquisition channel.
6. The battery management system of claim 5, wherein the processor comprises a computing unit;
the calculating unit is used for calculating the average value of the current value acquired by the first current acquisition channel and the current value acquired by the second current acquisition channel so as to acquire current data.
7. The battery management system of claim 1, wherein the front end voltage acquisition module comprises a plurality of voltage acquisition units, each voltage acquisition unit supporting an outer loop of the communication line and an inner loop of the communication line, the plurality of voltage acquisition units being daisy-chained;
the controller is connected with the voltage acquisition unit at the head end of the front end voltage acquisition module in a daisy chain manner, and is also used for controlling the voltage acquisition units on the daisy chain to carry out communication fault point inspection in a manner of switching between an external loop and an internal loop one by one when communication faults occur on the daisy chain.
8. The battery management system of claim 7, wherein the controller is configured to, upon a communication failure on the daisy chain, after controlling the Nth voltage acquisition unit on the daisy chain to carry out internal loop switching, sending a test command to the voltage acquisition unit at the head end, and determining that a communication fault point exists on the daisy chain circuit after the Nth voltage acquisition unit when a return result corresponding to the test command is received, and when the return result is not received, determining that a communication fault point exists on the daisy chain circuit before the Nth voltage acquisition unit, and after the voltage acquisition units before the Nth voltage acquisition unit are controlled to be switched into the internal loop one by one, and sending a retest command to perform communication test until the specific position of the communication fault point is determined, wherein N is the number of the plurality of voltage acquisition modules.
9. An electric vehicle characterized by comprising the battery management system according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910979919.2A CN110712561B (en) | 2019-10-15 | 2019-10-15 | Battery management system and electric automobile |
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| CN201910979919.2A CN110712561B (en) | 2019-10-15 | 2019-10-15 | Battery management system and electric automobile |
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