CN115642668A - High-voltage battery pack device and charge-discharge control method - Google Patents
High-voltage battery pack device and charge-discharge control method Download PDFInfo
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Abstract
The invention provides a high-voltage battery pack device and a charge-discharge control method, wherein the device comprises a high-voltage battery pack module, a charging module, a discharging module and a collection control module; the high-voltage battery pack module comprises a plurality of battery cells; the charging module is arranged between the direct-current high-voltage power supply and the high-voltage battery pack module and comprises a charging unit and a correcting unit; the discharging module is arranged between the high-voltage battery pack module and electric equipment; the acquisition control module is used for acquiring signals of the charging module, the high-voltage battery pack module and the discharging module in real time, performing real-time analysis on the signals, generating a control command and sending the control command to the charging module and the discharging module; the electric quantity of the high-voltage battery pack is improved to a certain extent, and the safety and the reliability of the high-voltage battery pack are improved.
Description
Technical Field
The invention belongs to the technical field of automatic control, and particularly relates to a high-voltage battery pack device and a charge and discharge control method.
Background
With the popularization of the green energy-saving concept, various high-voltage battery pack devices become the key point for the development of new energy industries. The high voltage battery refers to a battery having a higher battery voltage than that of a general battery. Generally, when the voltage is increased, the time for discharging the battery with the normal voltage is shorter than that of the battery with the high voltage within the same capacity and the same discharge time. This indicates that the high voltage battery can prolong the service life of the battery; it also means that the high voltage battery has the characteristics of high energy density and high discharge plateau. The high-voltage battery can discharge more capacity under the same using condition, so the endurance time is longer, and the power is stronger.
However, the high voltage battery also has the disadvantages of poor stability and poor safety. Theoretically, the smaller the pressure difference between the cells, the higher the cell consistency, i.e., the higher the battery stability and safety. However, even in the same batch of battery cells, the voltage difference and the capacity difference due to the voltage difference are more or less problematic in the manufacturing process. Particularly, the higher the cell voltage of the high-voltage battery is, the more easily the voltage difference is too large, which affects the storage capacity of the battery device and the stability of the battery pack, thereby resulting in poor safety of the battery pack.
On the other hand, most of the battery packs of various high-voltage battery pack devices existing at home and abroad are assembled by connecting battery boxes in series, and if any one of the battery boxes has a problem, the battery device cannot output power. In addition, the high-voltage battery pack device also has the problems of low reliability caused by imperfect control device, poor safety caused by the adoption of ternary batteries as the high-voltage battery core and the like.
Disclosure of Invention
Aiming at the defects or improvement requirements of the prior art, the invention provides a high-voltage battery pack device and a charging and discharging method, which can correct the pressure difference of the high-voltage battery pack and increase the stability and reliability of a battery by adopting a mode of connecting battery boxes in parallel; besides, the battery information can be collected in real time, the charging and discharging of the battery can be automatically controlled, a protection area is added, and the battery cell material is replaced to increase the safety of the battery.
In order to achieve the purpose, the invention adopts the following technical scheme.
A high voltage battery pack apparatus, the apparatus comprising:
a high voltage battery module including a plurality of battery cells;
the charging module is arranged between the direct-current high-voltage power supply and the high-voltage battery pack module and comprises a charging unit and a correcting unit;
the discharging module is arranged between the high-voltage battery pack module and electric equipment;
the acquisition control module is used for acquiring signals of the charging module, the high-voltage battery pack module and the discharging module in real time, performing real-time analysis on the signals, generating a control command and sending the control command to the charging module and the discharging module;
the charging unit receives the command of the acquisition and control module to charge the high-voltage battery pack module when all the signals acquired by the acquisition and control module are normal;
and the correction unit receives the command of the acquisition and control module to execute the charging correction of the corresponding battery monomer when the voltage difference signal of the battery monomer in the signal acquired by the acquisition and control module is greater than a threshold value, so that the voltage difference signal is less than the threshold value, and returns a command to the charging unit.
Further, the high-voltage battery pack module comprises a plurality of parallel battery boxes, and each battery box comprises a plurality of battery cells connected in series; each battery cell is connected with one correction unit.
Furthermore, the battery monomer is a lithium titanate battery.
Further, the charging module and/or the discharging module are provided with an insurance area.
Further, the signal further includes a charging current, a discharging current, a cell capacity, and a cell temperature.
According to another aspect of the present invention, the present invention also provides a charge and discharge control method of a high voltage battery pack, the method including:
s1: acquiring signals of all battery monomers in a high-voltage battery pack in real time, and analyzing the signals in real time;
s2: generating different control instructions according to the real-time analysis result;
when all the signals are judged to be normal, generating corresponding charge and discharge instructions for all the single batteries;
when the signal is judged to be abnormal, a power-off instruction of the single battery corresponding to the abnormal signal is generated, and then the step S3 is executed;
s3: analyzing whether the abnormal signals comprise pressure difference abnormal signals or not;
if yes, generating a voltage difference correction charging instruction for the corresponding battery monomer, and executing the step S1 after the voltage difference of the corresponding battery monomer is recovered to be normal;
and if not, generating a corresponding power-off isolation instruction of the battery box consisting of the battery monomers.
Further, the high-voltage battery pack comprises a plurality of identical battery boxes connected in parallel; the battery box comprises a plurality of identical battery cells connected in series; and each single battery is connected with a differential pressure correction unit.
Furthermore, the battery monomer is a lithium titanate battery.
Furthermore, the charging end and the discharging end of the battery box are provided with safety areas.
Further, the signal further includes a charging current, a discharging current, a cell capacity, and a cell temperature.
In summary, compared with the prior art, the present invention provides a high-voltage battery pack apparatus and a charge/discharge control method, which have the following advantages:
(1) According to the high-voltage battery pack device and the charge-discharge control method, the pressure difference correction unit is additionally arranged, when the pressure difference of the battery box exceeds a threshold value or the pressure difference of the battery monomer exceeds the threshold value, the battery monomer can be respectively charged and corrected through the pressure difference correction unit, the voltage reaches a fixed value through charging, and after the voltage of the battery monomer reaches balance, namely the pressure difference is smaller than the threshold value, the battery box is respectively charged through the charging unit, so that the voltage of each battery box is basically consistent, and the stability and the safety of the high-voltage battery pack are ensured;
(2) The invention provides a high-voltage battery pack device and a charge-discharge control method.A mode that a plurality of battery monomers are connected in series to form a battery box and then the battery boxes are connected in parallel to form a high-voltage battery pack is adopted, a charging module is provided with a safe area for isolating a charging unit, and a discharging module is also provided with a safe area for isolating the battery boxes; when one battery box has a problem, other battery boxes can continue to output work, the use of the whole battery device cannot be influenced, the electric quantity of the battery box is improved to a certain extent, and the reliability of the device and the method is improved;
(3) According to the high-voltage battery pack device and the charge and discharge control method, a perfect control strategy is adopted, so that the information acquisition, the automatic charge and discharge control and the pressure difference correction of the high-voltage battery pack device can be realized, and when the problems of undervoltage, overvoltage, overcurrent, overtemperature and the like occur to a high-voltage battery pack module, the charge and discharge can be automatically cut off, so that the high-voltage battery pack is protected;
(4) In addition, according to the high-voltage battery pack device and the charge-discharge control method, the lithium titanate battery is adopted as a battery monomer, the high-voltage battery pack device can be rapidly charged, can provide 10C high discharge current, has cycle times higher than those of a conventional lithium ion battery, has higher safety and excellent low-temperature discharge characteristics, and improves safety and reliability to a certain extent.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a general frame schematic diagram of a high-voltage battery pack apparatus and a charge/discharge control method according to the present invention;
fig. 2 is a schematic diagram of a charging module and a high-voltage battery pack module of a high-voltage battery pack apparatus and a charging/discharging control method according to 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 further described in 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 invention and do not limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Fig. 1 is a general block diagram of a high-voltage battery pack apparatus and a charge and discharge control method according to the present invention, the apparatus including:
a high voltage battery module including a plurality of battery cells; for storing electric quantity;
the charging module is arranged between the direct-current high-voltage power supply and the high-voltage battery pack module and comprises a charging unit and a correcting unit; the high-voltage battery pack module is used for charging the high-voltage battery pack module to finish energy storage or correcting the high-voltage battery pack module;
the discharging module is arranged between the high-voltage battery pack module and the electric equipment; the power supply system is used for supplying the electric quantity stored by the high-voltage battery pack module to electric equipment;
the acquisition control module is used for acquiring signals of the charging module, the high-voltage battery pack module and the discharging module in real time, performing real-time analysis on the signals, generating a control command and transmitting the control command to the charging module and the discharging module;
specifically, the acquisition module acquires signals such as current, voltage and temperature of the charging module and the discharging module in real time; signals such as current, voltage, electric quantity and temperature of a battery box of the high-voltage battery pack module and a battery monomer are collected in real time, then related signals are analyzed in real time through an internal processor, and then a control instruction is generated to control the charging module and the discharging module.
The charging module comprises a charging unit and a correcting unit;
the charging unit receives the instruction of the acquisition and control module to charge the high-voltage battery pack module when all the signals acquired by the acquisition and control module are normal;
and the correction unit receives the command of the acquisition and control module to execute charging correction on the corresponding battery monomer when the voltage difference signal of the battery monomer acquired by the acquisition and control module is greater than the threshold value, so that the voltage difference signal is less than the threshold value, and returns the command to the charging unit.
The charging unit receives a charging instruction to charge the high-voltage battery pack module, and the charging unit receives a disconnection instruction to stop charging; the correction unit receives a correction instruction and carries out charging correction on the high-voltage battery pack module; the discharging module receives a discharging instruction and provides the electric quantity stored by the high-voltage battery pack module for the electric equipment, and the discharging module receives a disconnecting instruction and stops discharging.
It should be noted that even in the same batch of battery cells, the voltage difference and the capacity difference caused by the voltage difference are more or less different during the manufacturing process. In particular, the high-voltage battery pack includes a plurality of battery cells, and the voltage of the battery pack is higher than that of a common battery, so that the voltage difference is more likely to be too large.
Therefore, when the voltage difference of the single battery exceeds the threshold, the high-voltage battery pack module needs to be charged and corrected, so that the voltage difference is smaller than the threshold; and then the acquisition control module issues a charging instruction to the charging unit and a discharging instruction to the discharging module.
It needs to be provided that in the whole charging and discharging process, signals are collected and analyzed in real time, and as long as the signals are abnormal, the collecting and controlling module can issue a disconnection command to the charging unit and the discharging module to automatically disconnect charging and discharging, so as to protect the battery device and avoid fire explosion; if the abnormal signals comprise the pressure difference, the device automatically disconnects the charging module and then performs pressure difference correction, after the correction is completed, the acquisition and control module acquires and analyzes the signals in real time, and when all the signals are in a normal state, the charging is continued.
The charging current and voltage of the high-voltage battery packs with different capacities are different from the output current and voltage, so that the high-voltage battery pack module needs to be controlled to perform accurate charging and discharging. Because the charging unit and the discharging module both have CAN bus communication functions, the charging unit and the discharging module CAN communicate with the acquisition and control module to accurately control charging current and voltage and discharging voltage and current, thereby meeting the requirements of different electric equipment.
As a further improvement of the present invention, the high voltage battery module comprises a plurality of parallel battery boxes, each battery box comprising a plurality of battery cells connected in series; each cell is connected to a correction unit.
Therefore, when the voltage difference of the single battery exceeds the threshold value or the voltage difference of the battery box exceeds the threshold value due to the fact that the single battery exists, the single battery is charged and corrected through the correction unit, the voltage of the single battery reaches a fixed value through charging, namely the voltage difference is smaller than the threshold value, then the battery box is charged through the charging unit, the voltage of each battery box is basically consistent, and therefore the stability and the reliability of the battery pack are guaranteed.
As a further improvement of the invention, the battery monomer adopts a lithium titanate battery. The lithium titanate battery adopts lithium manganate oxide or NMC as a positive electrode and adopts titanate as a negative electrode. Lithium titanate batteries can be charged rapidly, provide a high discharge current of 10C, have a cycle number higher than that of conventional lithium ion batteries, provide 80% of capacity at-30 ℃, have high safety, and excellent low-temperature discharge characteristics.
As a further improvement of the invention, the charging unit is provided with a safety area, when one charging unit fails, the charging unit can be isolated, and the work of other charging units is not influenced; the discharging module is also provided with a safe area which can isolate the output voltage of the battery boxes and prevent the battery boxes from charging and discharging; in short, the safe areas of the charging unit and the discharging module are both used for improving the safety and reliability of the device.
As a further improvement of the invention, the signals acquired by the acquisition module further comprise charging current, discharging current, battery monomer capacity and battery monomer temperature.
Only when all the signals collected are normal, the device can be charged and discharged. If the collected signals are abnormal, namely, overvoltage, undervoltage, overcurrent, short circuit, high temperature, low temperature, overcharge, overdischarge and other states occur, the acquisition and control module sends a disconnection command to the charging unit and the discharging module to automatically disconnect charging electricity, so that the high-voltage battery pack module is protected, the fire explosion is avoided, and the whole device is safer, more reliable and more stable.
In order to clearly and completely describe the technical scheme in the embodiment of the present invention, a high voltage battery pack apparatus provided by the present invention will be further explained with reference to fig. 2. Fig. 2 is a schematic diagram of a charging module and a high-voltage battery pack module of a high-voltage battery pack apparatus and a charging/discharging control method according to the present invention.
As an embodiment of the invention, the charging unit is formed by connecting 2 chargers in parallel for redundancy and then charging the high-voltage battery pack module; namely, the charger is connected in parallel with the high-voltage bus to charge and store energy for the high-voltage battery pack device. The correction unit is a power module, and 6 correction units are sequentially connected in series and are used for respectively performing charging correction on corresponding single batteries. More specifically, the input voltage range of the charger is 400V-750V, the output voltage range of the charger is 0V-590V, and the output power of the charger can be adjusted according to the electric quantity of the battery box. The charger has a CAN bus communication function and CAN communicate with the control circuit, and the charger CAN accurately output voltage and current required by the battery box; the charger has the protection functions of input overvoltage and undervoltage, output overvoltage and overcurrent and the like, and the safety of the charger and the safety of the battery pack are ensured. And the input end of each charger is provided with a safety, and the output port of each charger is connected with a diode in series, so that when one charger fails, the chargers can be isolated, the normal work of other chargers is not influenced, and the reliability of the device is improved.
In addition, the discharging module is also provided with a safety area which mainly comprises a high-voltage contactor, a fuse, an isolation diode and the like, wherein the high-voltage contactor plays a discharging control role, the fuse plays a discharging overcurrent protection role, and the isolation diode can isolate the output voltage of the battery box to prevent the battery box from charging and discharging each other. In short, the safe areas of the charging unit and the discharging module are both used for improving the safety and reliability of the device.
The high-voltage battery pack module is formed by connecting 3 same battery boxes in parallel, and is used for increasing energy storage and discharging. Each battery box is formed by connecting 6 same battery monomers in series, the rated capacity is 25Ah, the rated voltage is 540V, the float charging voltage is 590V, and the discharge multiplying power is 10C.
More specifically, the battery box is connected with a charger for charging, and each battery cell is connected with a power supply module for correction. Namely, the charger corresponds to the battery box; the power modules correspond to the battery monomers one to one. The charger receives a charging instruction to charge the battery box; and the power supply module receives the correction instruction to perform charging correction on the single battery.
The reason why the voltage difference is corrected to keep the voltages of the battery cells or the power supply module basically consistent is to ensure that the battery cells can be fully charged and can be completely released. In a batch of batteries, the charging is based on the highest voltage, and the charging is stopped after a certain battery monomer reaches the highest voltage; the discharge is based on the lowest voltage, and the discharge is stopped when a certain battery cell reaches the lowest voltage. Therefore, the voltage of all the battery monomers is guaranteed to be consistent, and the purposes of simultaneously charging and discharging, enabling the battery core to reach a full-charge state and completely releasing electric energy are achieved. Therefore, when the voltage difference exceeds the threshold value when the battery is single or the battery box is replaced, the power module can ensure the parallel connection safety of the battery boxes through charging correction.
As an embodiment of the present invention, a lithium titanate battery is used as the battery cell. Currently, common lithium ion batteries mainly include lithium cobaltate, lithium manganate, lithium nickel cobalt aluminate, lithium iron phosphate, and lithium titanate. The lithium cobalt oxide is used as the anode of the lithium cobalt oxide lithium battery, and the graphite is used as the cathode of the lithium cobalt oxide lithium battery, so that the lithium cobalt oxide lithium battery has high specific energy, safety and general cycle life performance. Lithium manganate oxide is adopted as a positive electrode of the lithium manganate battery, and graphite is adopted as a negative electrode of the lithium manganate battery, but the characteristic parameters of the lithium manganate battery are not ideal, and the lithium manganate battery is not generally applied. The nickel-cobalt-manganese-cobalt oxide is adopted as the anode of the nickel-cobalt-manganese lithium manganate battery, and the graphite is adopted as the cathode, so that the nickel-cobalt-manganese lithium manganate battery has better economical efficiency and comprehensive performance, but the cobalt resource is increasingly deficient and the price is expensive. The nickel-cobalt lithium aluminate battery adopts nickel-cobalt lithium aluminate as a positive electrode and graphite as a negative electrode, has higher specific energy and longer service life, but has poorer safety and higher cost. The lithium iron phosphate battery adopts lithium iron phosphate as a positive electrode and graphite as a negative electrode, has good electrochemical performance, low resistance, high rated current, long cycle life and good thermal stability and safety, but has low specific energy due to the nominal voltage, poor low-temperature performance and high self-discharge, and can cause the balance problem due to aging. The lithium titanate battery adopts lithium manganate oxide or NMC as a positive electrode and titanate as a negative electrode, can be quickly charged, provides 10C high discharge current, has cycle times higher than those of conventional lithium ion batteries, can provide 80% of capacity at-30 ℃, and has high safety and excellent low-temperature discharge characteristics. In a word, the lithium cobaltate battery and the lithium nickel cobalt manganese oxide have low thermal runaway temperature and poor safety, and cannot meet the safety requirement. The cycle life of lithium cobalt oxide batteries, lithium manganate batteries and lithium nickel cobalt aluminate batteries is short, and the service life requirements can not be met. And the low-temperature performance of the lithium iron phosphate battery is poor. Therefore, the lithium titanate battery is adopted as the battery monomer by comprehensively considering the comprehensive factors of safety, cycle life, specific energy and the like.
As another aspect of the present invention, the present invention also provides a charge and discharge control method of a high voltage battery pack, the method including:
s1: acquiring signals of all single batteries in the high-voltage battery pack in real time, and analyzing the signals in real time;
specifically, signals such as current, voltage, electric quantity and temperature of all the battery cells are collected in real time, and then the signals are analyzed in real time through an internal processor.
S2: generating different control instructions according to the real-time analysis result;
when all the signals are judged to be normal, generating corresponding charge and discharge instructions for all the battery monomers;
specifically, when all the signals collected are normal: generating a charging instruction to charge the battery monomer to finish energy storage; generating a discharge instruction to discharge the battery monomer and providing the stored electric quantity for the electric equipment;
when the signal is judged to be abnormal, a power-off instruction of the battery monomer corresponding to the abnormal signal is generated, and then the step S3 is executed;
when the states such as excessive pressure, undervoltage, overcurrent, short circuit, high temperature, low temperature, overcharge, overdischarge appear promptly unusually, need provide that in whole charge-discharge process, the signal all is real-time collection and real-time analysis, as long as there is signal anomaly, will generate outage instruction automatic shutdown charge-discharge to play the guard action to the high-voltage battery group, avoid taking place to catch fire the explosion, make the high-voltage battery group safer, reliable and stable.
S3: analyzing whether the abnormal signals comprise pressure difference abnormal signals or not;
if yes, generating a differential pressure correction charging instruction for the corresponding battery monomer, and executing the step S1 after the differential pressure of the corresponding battery monomer is recovered to be normal;
and if not, generating a corresponding power-off isolation instruction of the battery box consisting of the battery cells.
It should be noted that even in the same batch of battery cells, the voltage difference and the capacity difference caused by the voltage difference are more or less different during the manufacturing process. In particular, the high-voltage battery pack includes a plurality of battery cells, and the voltage of the battery pack is higher than that of a common battery, so that the voltage difference is more likely to be too large.
Therefore, when the abnormal signal comprises a differential pressure abnormal signal in the signals collected in real time, namely the differential pressure is smaller than the threshold value; a differential pressure correction charging instruction is generated to perform charging correction on the corresponding battery monomer, so that the differential pressure of the battery monomer is recovered to a normal state; then acquiring signals of all the single batteries in the high-voltage battery pack in real time, and analyzing the signals in real time; generating different control instructions according to the real-time analysis result;
if all the signals are normal, generating corresponding charge and discharge instructions for all the battery monomers; if the signal is abnormal, and the abnormal signal does not comprise a differential pressure abnormal signal, generating a power-off command of the single battery corresponding to the abnormal signal to automatically stop charging and discharging; and a corresponding power-off isolation instruction of the battery box consisting of the battery monomers is generated, so that the normal work of other battery boxes cannot be influenced even if one battery box has a problem.
As a further improvement of the invention, the high-voltage battery pack comprises a plurality of identical battery boxes which are connected in parallel; the battery box comprises a plurality of same battery monomers which are connected in series; and each battery cell is connected with one differential pressure correction unit. .
Therefore, when the voltage difference of the single battery exceeds the threshold value or the voltage difference of the battery box exceeds the threshold value due to the fact that the single battery exists, the single battery is charged and corrected through the voltage difference correction unit, the voltage of the single battery reaches a fixed value through charging, namely the voltage difference is smaller than the threshold value, then the battery box is charged, the voltage of each battery box is basically consistent, and therefore the charging and discharging stability and reliability of the high-voltage battery pack are guaranteed.
As a further improvement of the invention, the battery monomer adopts a lithium titanate battery. The lithium titanate battery adopts lithium manganate oxide or NMC as a positive electrode and titanate as a negative electrode, can be quickly charged, provides 10C high discharge current and has cycle times higher than that of the conventional lithium ion battery; and can provide 80% of capacity at-30 ℃, and has higher safety and excellent low-temperature discharge characteristic.
As a further improvement of the invention, the charging end and the discharging end of the battery box are provided with safe areas. When a battery box breaks down, can keep apart it, prevent that the battery box from charging and discharging each other, do not influence the work of other battery boxes, in a word, the safety zone is also in order to improve the security and the reliability of high-voltage battery group charging and discharging.
As a further improvement of the invention, the collected signals further comprise charging current, discharging current, battery cell capacity and battery cell temperature.
When all the acquired signals are normal, a charging instruction can be generated to charge the battery monomer to finish energy storage; and generating a discharge instruction to discharge the battery cell and providing the stored electric quantity for the electric equipment. In case when abnormal conditions such as overvoltage, undervoltage, overcurrent, short circuit, high temperature, low temperature, overcharge, overdischarge and the like occur, a power-off instruction is generated to automatically stop charging and discharging, so that the high-voltage battery pack is protected, the fire explosion is avoided, and the high-voltage battery pack is safer, more reliable and more stable.
In order to clearly and completely describe the technical scheme in the embodiment of the present invention, the charge and discharge control method of the high-voltage battery pack provided by the present invention will be further explained according to the above-mentioned high-voltage battery pack device.
The high-voltage battery pack module is formed by connecting 3 same battery boxes in parallel, and energy storage is increased and used for energy storage and discharge. Each battery box is formed by connecting 6 same battery monomers in series, the rated capacity is 25Ah, the rated voltage is 540V, the float charge voltage is 590V, and the discharge multiplying power is 10C.
More specifically, the battery box is connected with a charger for charging, and each battery cell is connected with a power supply module for correction. Namely, the charger corresponds to the battery box; the power modules correspond to the battery monomers one to one. The charger receives a charging instruction to charge the battery box; and the power supply module receives the correction instruction to perform charging correction on the single battery.
The voltage difference correction unit is a power module and is used for performing charging correction on the corresponding single battery. More specifically, the input voltage range of the charger is 400V-750V, the output voltage range of the charger is 0V-590V, and the output power of the charger can be adjusted according to the electric quantity of the battery box.
And the charging end and the discharging end of the battery box are provided with safe areas. The input of end that charges has set up the insurance, the diode has been established ties to the output port, in addition, the end that discharges has also set up safe district, mainly include high-voltage contactor, the fuse, keep apart diode etc. high-voltage contactor plays the discharge control effect, the fuse plays the discharge overcurrent protection effect, keep apart the diode and can keep apart the output voltage of battery box, when a battery box breaks down, can keep apart it, prevent battery box charge-discharge each other, do not influence the normal work of other battery boxes.
As an embodiment of the present invention, a lithium titanate battery is used as the battery cell. Currently, common lithium ion batteries mainly include lithium cobaltate, lithium manganate, lithium nickel cobalt aluminate, lithium iron phosphate, and lithium titanate. The lithium cobalt oxide is used as the anode of the lithium cobalt oxide lithium battery, and the graphite is used as the cathode of the lithium cobalt oxide lithium battery, so that the lithium cobalt oxide lithium battery has high specific energy, safety and general cycle life performance. The lithium manganate battery adopts lithium manganate oxide as a positive electrode and graphite as a negative electrode, but the characteristic parameters are not ideal and the application is not common. The nickel-cobalt-manganese-cobalt oxide is adopted as the anode of the nickel-cobalt-manganese lithium manganate battery, and the graphite is adopted as the cathode, so that the nickel-cobalt-manganese lithium manganate battery has better economical efficiency and comprehensive performance, but the cobalt resource is increasingly deficient and the price is expensive. The nickel-cobalt lithium aluminate battery adopts nickel-cobalt lithium aluminate as a positive electrode and graphite as a negative electrode, has higher specific energy and longer service life, but has poorer safety and higher cost. The lithium iron phosphate battery adopts lithium iron phosphate as a positive electrode and graphite as a negative electrode, has good electrochemical performance, low resistance, high rated current, long cycle life and good thermal stability and safety, but has low specific energy due to the nominal voltage, poor low-temperature performance and high self-discharge, and can cause the balance problem due to aging. The lithium titanate battery adopts lithium manganate oxide or NMC as a positive electrode and titanate as a negative electrode, can be quickly charged, provides 10C high discharge current, has cycle times higher than that of a conventional lithium ion battery, can provide 80% of capacity at-30 ℃, and has high safety and excellent low-temperature discharge characteristics. In a word, the lithium cobaltate battery and the lithium nickel cobalt manganese oxide have low thermal runaway temperature and poor safety, and cannot meet the safety requirement. The cycle life of lithium cobalt oxide batteries, lithium manganate batteries and lithium nickel cobalt aluminate batteries is short, and the service life requirements can not be met. And the low-temperature performance of the lithium iron phosphate battery is poor. Therefore, the lithium titanate battery is adopted as the battery monomer by comprehensively considering the comprehensive factors of safety, cycle life, specific energy and the like.
In summary, the invention provides a high-voltage battery pack device and a charge-discharge control method, wherein a correction unit is added, and the output voltage of each battery box is basically consistent by adopting a mode of connecting a plurality of battery monomers in series to form a battery box and connecting a plurality of battery boxes in parallel to form a high-voltage battery pack; the safety areas are arranged at the charging end and the discharging end of the battery box, so that the stability and the reliability of the whole high-voltage battery pack are improved to a certain extent; in addition, by adopting a perfect control strategy, charging and discharging and power-off can be automatically controlled, and the method is more convenient and reliable.
While, for purposes of simplicity of explanation, the methodologies are shown and described as a series of acts, it will be appreciated by those skilled in the art that the claimed subject matter is not limited by the order of acts, as some steps may, in accordance with the claimed subject matter, occur in other orders and/or concurrently. Further, those skilled in the art should also appreciate that the embodiments described in the specification are preferred embodiments and that the acts and modules referred to are not necessarily required by the invention.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus may be implemented in other manners. For example, the above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units is only one type of division of logical functions, and there may be other divisions when actually implementing, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or not implemented. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection of some service interfaces, devices or units, and may be an electrical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one position, or may be distributed on multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit may be implemented in the form of hardware, or may also be implemented in the form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable memory. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a memory and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned memory comprises: various media capable of storing program codes, such as a usb disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic disk, or an optical disk.
Those skilled in the art will appreciate that all or part of the steps in the methods of the above embodiments may be implemented by a program, which is stored in a computer-readable memory, and the memory may include: flash disks, read-Only memories (ROMs), random Access Memories (RAMs), magnetic or optical disks, and the like.
The above description is only an exemplary embodiment of the present disclosure, and the scope of the present disclosure should not be limited thereby. That is, all equivalent changes and modifications made in accordance with the teachings of the present disclosure are intended to be included within the scope of the present disclosure. Embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
All possible combinations of the technical features in the above embodiments may not be described for the sake of brevity, but should be considered as being within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.
It will be understood by those skilled in the art that the foregoing is only an exemplary embodiment of the present invention, and is not intended to limit the invention to the particular forms disclosed, since various modifications, substitutions and improvements within the spirit and scope of the invention are possible and within the scope of the appended claims.
Claims (10)
1. A high voltage battery pack apparatus, comprising:
a high voltage battery module including a plurality of battery cells;
the charging module is arranged between the direct-current high-voltage power supply and the high-voltage battery pack module and comprises a charging unit and a correcting unit;
the discharging module is arranged between the high-voltage battery pack module and electric equipment;
the acquisition control module is used for acquiring signals of the charging module, the high-voltage battery pack module and the discharging module in real time, performing real-time analysis on the signals, generating a control instruction and sending the control instruction to the charging module and the discharging module;
the charging unit receives the command of the acquisition and control module to charge the high-voltage battery pack module when all the signals acquired by the acquisition and control module are normal;
and the correction unit receives the command of the acquisition and control module to execute the charging correction of the corresponding battery monomer when the voltage difference signal of the battery monomer in the signal acquired by the acquisition and control module is greater than a threshold value, so that the voltage difference signal is less than the threshold value, and returns a command to the charging unit.
2. A high voltage battery pack apparatus as claimed in claim 1, wherein said high voltage battery pack module comprises a plurality of parallel battery cases, each of said battery cases comprising a plurality of cells connected in series; each of the battery cells is connected to one of the correction units.
3. A high voltage battery pack apparatus as claimed in claim 1 or 2, wherein said battery cell is a lithium titanate battery.
4. A high voltage battery arrangement according to claim 1, characterized in that the charging module and/or the discharging module are provided with a safety area.
5. A high voltage battery pack apparatus as claimed in claim 1, wherein said signals further include charge current, discharge current, cell capacity, and cell temperature.
6. A method of controlling charging and discharging of a high voltage battery, the method comprising:
s1: acquiring signals of all single batteries in the high-voltage battery pack in real time, and analyzing the signals in real time;
s2: generating different control instructions according to the real-time analysis result;
when all the signals are judged to be normal, generating corresponding charge and discharge instructions for all the battery monomers;
when the signal is judged to be abnormal, a power-off instruction of the single battery corresponding to the abnormal signal is generated, and then the step S3 is executed;
s3: analyzing whether the abnormal signals comprise pressure difference abnormal signals or not;
if yes, generating a voltage difference correction charging instruction for the corresponding battery monomer, and executing the step S1 after the voltage difference of the corresponding battery monomer is recovered to be normal;
and if not, generating a corresponding power-off isolation instruction of the battery box consisting of the battery monomers.
7. The charge and discharge control method of a high voltage battery pack according to claim 6, wherein said high voltage battery pack includes a plurality of identical said battery boxes connected in parallel; the battery box comprises a plurality of identical battery cells connected in series; and each single battery is connected with a differential pressure correction unit.
8. The charge and discharge control method of a high-voltage battery pack according to claim 6 or 7, wherein the battery cells are lithium titanate batteries.
9. The method for controlling charging and discharging of a high voltage battery according to claim 6 or 7, wherein the charging terminal and the discharging terminal of the battery box are provided with a safe area.
10. The method according to claim 6, wherein the signal further comprises a charging current, a discharging current, a cell capacity, and a cell temperature.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211346688.XA CN115642668A (en) | 2022-10-31 | 2022-10-31 | High-voltage battery pack device and charge-discharge control method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211346688.XA CN115642668A (en) | 2022-10-31 | 2022-10-31 | High-voltage battery pack device and charge-discharge control method |
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| CN115642668A true CN115642668A (en) | 2023-01-24 |
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| CN202211346688.XA Pending CN115642668A (en) | 2022-10-31 | 2022-10-31 | High-voltage battery pack device and charge-discharge control method |
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