CN112186860A - Protection device and power supply system for mixed use of lead-acid battery pack and lithium battery pack - Google Patents
Protection device and power supply system for mixed use of lead-acid battery pack and lithium battery pack Download PDFInfo
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- CN112186860A CN112186860A CN202011149545.0A CN202011149545A CN112186860A CN 112186860 A CN112186860 A CN 112186860A CN 202011149545 A CN202011149545 A CN 202011149545A CN 112186860 A CN112186860 A CN 112186860A
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- battery pack
- lead
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- lithium battery
- acid battery
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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
- H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
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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
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
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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
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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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- 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
- H02J7/36—Arrangements using end-cell switching
Abstract
The invention discloses a protection device for mixed use of a lead-acid battery pack and a lithium battery pack, wherein in the scheme, when a processor receives a cut-off signal, a first switch is controlled to be closed, a second switch is controlled to be opened, and the lithium battery pack supplies power to a load; when the lithium battery pack discharges to a voltage value lower than the voltage threshold value, the processor controls the first switch to be switched off and controls the second switch to be switched on, and the lead-acid battery pack supplies power to the load. Therefore, the mode can be realized by setting the processor and the low-cost switch, the power can be supplied to the load by the lithium battery pack preferentially when the power supply is disconnected, the cost is lower, the circuit of the device is simple, the condition that the interference is more due to the complex circuit does not exist, and the reliability of supplying power to the load when the lead-acid battery pack and the lithium battery pack are used in a mixed mode is improved. The invention also discloses a power supply system which has the same beneficial effects as the protection device for mixed use of the lead-acid battery pack and the lithium battery pack.
Description
Technical Field
The invention relates to the technical field of new energy lead-acid battery and lithium battery pack application, in particular to a protection device and a power supply system for mixed use of a lead-acid battery pack and a lithium battery pack.
Background
At present, lead-acid batteries are widely used in application fields such as communication standby, Power storage and data center UPS (uninterruptible Power System). In recent years, with the increasing maturity of lithium ion battery technology, lithium batteries can replace the original lead-acid batteries in the application fields to play the same functions and roles, and the cost of the lithium batteries is lower than that of the lead-acid batteries, so the trend of replacing the lead-acid batteries by the lithium batteries is obvious.
However, a considerable amount of lead-acid batteries are still kept in the application fields, and a great part of the lead-acid batteries still have great use value due to short use time or infrequent charging and discharging, so that if the lead-acid batteries are directly replaced and discarded, great waste is caused.
Therefore, a lead-acid battery pack and a lithium battery pack are commonly used in the market at present, and in consideration of short cycle life of the lead-acid battery, when the power supply is cut off, short standby power is preferably provided by the lithium battery pack. The voltage that sets up lithium cell group among the prior art is higher than lead acid battery group voltage usually, and when the power was cut off, because lithium cell group voltage was higher than lead acid battery group voltage, lithium cell group can be preferentially to the load power supply. However, in this method, a boost circuit is required, which is usually complex, and thus energy conversion is lost, reliability of supplying power to a load when the lead-acid battery pack and the lithium battery pack are used in a mixed manner is reduced, and cost is high.
Disclosure of Invention
The invention aims to provide a protection device and a power supply system for mixed use of a lead-acid battery pack and a lithium battery pack.
In order to solve the above technical problems, the present invention provides a protection device for a lead-acid battery pack and a lithium battery pack, comprising:
the first switch is connected in series with the lithium battery pack and the load loop;
a second switch connected in series between the lead-acid battery pack and the load circuit;
the processor is respectively connected with the control end of the first switch and the control end of the second switch, and is used for controlling the first switch to be closed and the second switch to be opened when a cut-off signal is received, so that the lithium battery pack supplies power to the load; and when the lithium battery pack discharges to be lower than a voltage threshold value, the first switch is controlled to be switched off, and the second switch is controlled to be switched on, so that the lead-acid battery pack supplies power to the load.
Preferably, the method further comprises the following steps:
the rectifying module is connected with the power supply at the input end and the lithium battery pack and the lead-acid battery pack at the output end respectively and used for rectifying alternating current provided by the power supply into direct current;
the third switch is connected in series with the lithium battery pack and the rectifying module loop, and the control end of the third switch is connected with the processor;
the fourth switch is connected in series with the lead-acid battery pack and the rectifying module loop, and the control end of the fourth switch is connected with the processor;
the processor is further used for controlling the third switch and the fourth switch to be closed when a power supply signal is received, so that the power supply can charge the lithium battery pack and the lead-acid battery pack.
Preferably, the method further comprises the following steps:
the monitoring module is used for sending the cut-off signal to the processor when monitoring that the power supply is cut off, and sending the power supply signal to the processor when monitoring that the power supply is electrified.
Preferably, the method further comprises the following steps:
the rectifying module is connected with the power supply at the input end and the lithium battery pack and the lead-acid battery pack at the output end respectively and used for rectifying alternating current provided by the power supply into direct current;
the third switch is connected in series with the circuit of the lithium battery pack and the rectifying module, and the control end of the third switch is connected with the processor;
the fourth switch is connected in series with the circuit of the lead-acid battery pack and the rectifying module, and the control end of the fourth switch is connected with the processor;
the processor is further configured to determine whether the lead-acid battery pack discharges to the voltage threshold, and if so, control both the third switch and the fourth switch to be closed.
Preferably, the processor is further configured to determine whether the lead-acid battery pack discharges to the voltage threshold, and if so, control both the third switch and the fourth switch to be closed, including:
and judging whether the discharge time of the lead-acid battery pack reaches a preset holding time, if so, judging that the lead-acid battery pack discharges to the voltage threshold, and controlling the third switch and the fourth switch to be closed.
Preferably, the lead-acid battery packs are N groups, the N groups of lead-acid battery packs are connected in parallel, each group of lead-acid battery pack comprises M lead-acid batteries, and the M lead-acid batteries are connected in series, wherein N, M are integers not less than 1.
Preferably, the lithium battery packs are P groups, and the P groups are connected in parallel through dry contacts, wherein P is an integer not less than 1.
Preferably, the method further comprises the following steps:
and the alarm module is connected with the processor and used for giving an alarm when the lithium battery pack discharges to a voltage lower than a voltage threshold value.
Preferably, the processor is a battery management system BMS, wherein the BMS is connected to the first switch and/or the second switch through a dry contact of the lithium battery.
In order to solve the above technical problem, the present invention further provides a power supply system, which includes the protection device for hybrid use of the lead-acid battery pack and the lithium battery pack, and further includes:
the lithium battery pack is connected with a protection device which is used by mixing the lead-acid battery pack and the lithium battery pack;
and the lead-acid battery pack is connected with the protection device which is used by mixing the lead-acid battery pack and the lithium battery pack.
The invention provides a protection device for mixed use of a lead-acid battery pack and a lithium battery pack, which is characterized in that a first switch for controlling the lithium battery pack to supply power to a load and a second switch for controlling the lead-acid battery pack to supply power to the load are arranged, when a processor receives a cut-off signal, the first switch is controlled to be closed, the second switch is controlled to be opened, and the lithium battery pack supplies power to the load; when the lithium battery pack discharges to a voltage value lower than the voltage threshold value, the processor controls the first switch to be switched off and controls the second switch to be switched on, and the lead-acid battery pack supplies power to the load. Therefore, the mode can be realized by setting the processor and the low-cost switch, the power can be supplied to the load by the lithium battery pack preferentially when the power supply is disconnected, the cost is lower, the circuit of the device is simple, the condition that the interference is more due to the complex circuit does not exist, and the reliability of supplying power to the load when the lead-acid battery pack and the lithium battery pack are used in a mixed mode is improved.
The invention also provides a power supply system which has the same beneficial effects as the protection device for mixed use of the lead-acid battery pack and the lithium battery pack.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed in the prior art and 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 to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a protection device for a lead-acid battery pack and a lithium battery pack in hybrid use according to the present invention;
fig. 2 is a schematic structural diagram of another protection device for a lead-acid battery pack and a lithium battery pack which are used in combination according to the present invention;
FIG. 3 is a graph of average discharge voltage versus retention time for a lead acid battery according to the present invention;
fig. 4 is a schematic structural diagram of a power supply system according to the present invention.
Detailed Description
The core of the invention is to provide a protection device and a power supply system for mixed use of a lead-acid battery pack and a lithium battery pack, the protection device and the power supply system are provided with a processor and a low-cost switch, the lithium battery pack can preferentially supply power to a load when a power supply is disconnected, the cost is lower, the circuit of the protection device is simple, the situation of more interference caused by the complex circuit is avoided, and the reliability of supplying power to the load when the lead-acid battery pack and the lithium battery pack are mixed for use is improved.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. 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.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a protection device for a lead-acid battery pack and a lithium battery pack used in combination according to the present invention.
The device includes:
the first switch 1 is connected in series with the lithium battery pack and the load loop;
the second switch 2 is connected in series with the lead-acid battery pack and the load loop;
the processor 3 is respectively connected with the control end of the first switch 1 and the control end of the second switch 2, and is used for controlling the first switch 1 to be closed and the second switch 2 to be opened when receiving the cut-off signal, so that the lithium battery pack supplies power to the load; when the lithium battery pack discharges to be lower than the voltage threshold value, the first switch 1 is controlled to be switched off, and the second switch 2 is controlled to be switched on, so that the lead-acid battery pack supplies power to a load.
The applicant considers that the lead-acid battery and the lithium battery are generally used in a mixed mode in the market at present, and considering that the cycle life of the lead-acid battery is short, when the power supply is cut off, the short-time standby power is preferentially provided by the lithium battery. The voltage that sets up lithium cell group among the prior art is higher than lead acid battery group voltage usually, and when the power was cut off, because lithium cell group voltage was higher than lead acid battery group voltage, lithium cell group can be preferentially to the load power supply. However, in this method, a boost circuit is required, which is usually complex, and thus energy conversion is lost, reliability of supplying power to a load when the lead-acid battery pack and the lithium battery pack are used in a mixed manner is reduced, and cost is high.
In the embodiment, a first switch 1 for controlling the lithium battery pack to supply power to the load and a second switch 2 for controlling the lead-acid battery pack to supply power to the load are arranged, when the processor 3 receives a cut-off signal, the first switch 1 is controlled to be closed, the second switch 2 is controlled to be opened, and the lithium battery pack supplies power to the load; when the lithium battery pack discharges to a voltage lower than the voltage threshold value, the processor 3 controls the first switch 1 to be switched off and controls the second switch 2 to be switched on, and the lead-acid battery pack supplies power to the load.
It should be noted that, the processor 3 is generally a BMS (Battery Management System) disposed inside the lithium Battery pack, the BMS includes a trunk input and a trunk output, and the control logic of the BMS internal software supports the control logic for the hybrid use of the lead-acid lithium Battery, wherein the trunk input and the trunk output of the BMS are the multiplexing of the lithium Battery pack trunk.
Of course, the processor 3 is not limited to the BMS installed in the lithium battery pack, and the processor 3 is not particularly limited in the present application.
It should be further noted that the lithium battery includes a sleep state and an active state, wherein the active state includes a normal operation mode and a maintenance mode. When the lithium battery is in a dormant state, the first switch 1 is switched off and the lithium battery is not controlled by the BMS; when the lithium battery is in a normal working mode, the first switch 1 is closed and the lithium battery is controlled by the BMS; when the lithium battery is in the maintenance mode, the first switch 1 is turned off and the lithium battery is controlled by the BMS. And when the lithium battery pack is discharged to be lower than the voltage threshold value, the lithium battery pack enters a maintenance mode.
In addition, the lead-acid battery pack herein may be a valve-regulated sealed lead-acid battery, such as AGM (absorbed Glass Mat), flat gel, tubular gel battery, lead carbon, pure lead battery, and the like; however, the lead-acid battery pack is not limited to the valve-regulated sealed lead-acid battery, and the present application is not limited thereto.
In addition, the first switch 1 and the second switch 2 are generally configured as relays, but are not limited to relays, and the present application is not limited thereto.
In conclusion, the mode is through setting up treater 3 and low-cost switch, can be when the power disconnection, preferentially by lithium cell group to load power supply, the cost is lower to the device circuit is simple, does not lead to because of the complicated more condition of interference that leads to of circuit, has improved the reliability of supplying power to the load when lead-acid batteries group and lithium cell group mixed use.
Referring to fig. 2 and fig. 3, fig. 2 is a schematic structural diagram of another protection device for a lead-acid battery pack and a lithium battery pack in hybrid use according to the present invention; fig. 3 is a graph of average discharge voltage-holding time of the lead-acid battery provided by the invention, wherein the abscissa is the holding time of the lead-acid battery, and the ordinate is the average discharge voltage of each lead-acid battery.
On the basis of the above-described embodiment:
as a preferred embodiment, further comprising:
the rectifying module 4 is connected with the power supply at the input end and the lithium battery pack and the lead-acid battery pack at the output end respectively and used for rectifying alternating current provided by the power supply into direct current;
the third switch 5 is connected in series on the loop of the lithium battery pack and the rectifying module 4, and the control end of the third switch is connected with the processor 3;
the fourth switch 6 is connected in series on the loop of the lead-acid battery pack and the rectifying module 4, and the control end of the fourth switch is connected with the processor 3;
the processor 3 is further configured to control the third switch 5 and the fourth switch 6 to be closed when receiving the power supply signal, so that the power supply can charge the lithium battery pack and the lead-acid battery pack.
Because the lithium battery pack and the lead-acid battery pack are usually connected in parallel, when the lithium battery pack is discharged to be lower than the voltage threshold, the voltage of the lithium battery pack is obviously lower than the voltage of the lead-acid battery pack, which can cause the lithium battery pack to be reversely charged by the lead-acid battery pack, and has a large influence on the power supply of the lead-acid battery pack to a load, in order to avoid the situation, in the embodiment, a third switch 5 and a fourth switch 6 are arranged, which are connected in series on a loop of the lithium battery pack and a rectifier module 4 and have control ends connected with a processor 3, and when the processor 3 receives a power supply signal, the third switch 5 and the fourth switch 6 are controlled to be closed, at the moment, alternating current provided by a power supply is rectified into direct current through the rectifier module 4 to jointly charge the lithium battery pack and the lead-acid battery pack, even if the lead-acid battery pack, its effect on the lead acid battery is also extremely minimal and negligible.
It should be noted that the third switch 5 and the fourth switch 6 are generally configured as relays, but are not limited to relays, and the present application is not limited thereto.
In addition, after the lithium battery pack and the lead-acid battery pack are fully charged, the floating charge mode is switched to.
As a preferred embodiment, further comprising:
and the monitoring module is used for sending a cut-off signal to the processor 3 when monitoring that the power supply is cut off, and sending a power supply signal to the processor 3 when monitoring that the power supply is electrified.
In order to monitor the state of the power supply in real time, in the embodiment, a monitoring module is provided, an input end of which is connected with the rectifying module 4, and an output end of which is connected with the processor 3, and when the power supply is monitored to be cut off, a cut-off signal is sent to the processor 3; when the city electricity is accessed, the monitoring module monitors the power supply to be electrified and sends a power supply signal to the processor 3, and alternating current provided by the power supply is rectified into direct current through the rectifying module 4 and then is charged to the lithium battery and the lead-acid lithium battery together.
It should be noted that the input end of the monitoring module is usually the dry contact DI of the monitoring module, and the output end of the monitoring module is usually the dry contact DO of the monitoring module, wherein the dry contact DO of the monitoring module is connected with the dry contact of the lithium battery pack.
Of course, the input terminal of the monitoring module is not limited to the dry contact DI of the monitoring module, and the output terminal of the monitoring module is not limited to the dry contact DO of the monitoring module, and the application is not limited thereto.
As a preferred embodiment, further comprising:
the rectifying module 4 is connected with the power supply at the input end and the lithium battery pack and the lead-acid battery pack at the output end respectively and used for rectifying alternating current provided by the power supply into direct current;
the third switch 5 is connected in series on the loop of the lithium battery pack and the rectifying module 4, and the control end of the third switch is connected with the processor 3;
the fourth switch 6 is connected in series on the loop of the lead-acid battery pack and the rectifying module 4, and the control end of the fourth switch is connected with the processor 3;
the processor 3 is further configured to determine whether the lead-acid battery pack discharges to a voltage threshold, and if so, control both the third switch 5 and the fourth switch 6 to be closed.
Because lithium cell group and lead acid battery group are parallelly connected usually, when lithium cell group discharged to being less than the voltage threshold, lithium cell group voltage obviously was less than lead acid battery group voltage, can lead to lithium cell group by lead acid battery group reverse charging, and is great to lead acid battery group to the influence of load power supply, for avoiding this kind of condition, another kind of solution has been proposed to this embodiment. The processor 3 judges whether the lead-acid battery pack discharges to a voltage threshold value, and controls the third switch 5 and the fourth switch 6 to be closed if the lead-acid battery pack discharges to the voltage threshold value, so that the voltages of the lithium battery pack and the lead-acid battery pack are basically consistent, and the lithium battery pack cannot be reversely charged by the lead-acid battery pack.
As a preferred embodiment, determining whether the lead-acid battery pack is discharged to the voltage threshold, and if so, controlling both the third switch 5 and the fourth switch 6 to be closed includes:
and judging whether the discharge time of the lead-acid battery pack reaches the preset holding time, if so, judging that the lead-acid battery pack discharges to a voltage threshold, and controlling the third switch 5 and the fourth switch 6 to be closed.
On the basis of the foregoing embodiments, the present embodiment provides a specific implementation manner of the processor 3 determining whether the lead-acid battery pack is discharged to the voltage threshold.
Note that the preset holding time here is calculated based on the load current and the battery capacity. The lead-acid battery pack is formed by connecting 4 FTA12-190(12V190Ah) lead-acid batteries in series to form a 48V190Ah lead-acid battery pack. If the set value of the voltage threshold of the lithium battery pack is 48V, namely the average discharge voltage of each 12V lead-acid storage battery reaches 11.5V, the average load current of the system is 50A; when the system discharges only by using the lead-acid battery, the discharge rate is 50/190 ═ 0.26C, and the value is close to 0.28C according to the average discharge voltage-holding time curve chart of the lead-acid battery, so that the holding time of the lithium battery maintenance mode is 2.5 hours, namely 150 minutes. By inputting the value into the BMS, the lithium battery pack can be ensured to have enough time to be isolated from the lead-acid battery pack after discharging, and the lead-acid battery pack is prevented from being charged.
Of course, the preset holding time is not limited to be calculated in this way, and the application is not limited thereto.
As a preferable embodiment, the lead-acid battery pack is N groups, the N groups of lead-acid battery packs are connected in parallel, each group of lead-acid battery pack includes M lead-acid batteries, and the M lead-acid batteries are connected in series, wherein N, M are integers not less than 1.
In a preferred embodiment, the lithium battery packs are P groups, and the P groups of lithium battery packs are connected in parallel by dry contacts, wherein P is an integer not less than 1.
In order to enable the protection device used by mixing the lead-acid battery pack and the lithium battery pack to supply power to loads with different sizes, in this embodiment, the lead-acid battery packs may be set into N groups, wherein the N groups of lead-acid battery packs are connected in parallel; each group of lead-acid battery packs comprises M lead-acid batteries which are connected in series, wherein N, M are integers not less than 1; similarly, the lithium battery pack can be set as a P group, and the P group lithium battery packs are connected in parallel through dry contacts, wherein P is an integer not less than 1. Therefore, the lead-acid battery pack and the lithium battery pack with different capacities can be obtained by the method, and the power can be supplied to loads with different sizes.
It should be noted that, when the lithium battery packs are multiple groups, only one first switch 1 and/or one third switch 5 may be used for control on the parallel branches of the multiple groups of lithium battery packs; and similarly, when the lead-acid battery packs are connected in parallel, only one second switch 2 and/or one fourth switch 6 can be used for controlling the parallel branches of the lead-acid battery packs.
As a preferred embodiment, further comprising:
and the alarm module is connected with the processor 3 and used for giving an alarm when the lithium battery pack discharges to a voltage lower than a voltage threshold value.
In order to inform the processor 3 when the lithium battery pack discharges below the voltage threshold, so that the processor 3 performs corresponding control, in this embodiment, an alarm module connected to the processor 3 is provided, and an alarm can be given when the lithium battery pack discharges below the voltage threshold.
As a preferred embodiment, the processor 3 is a BMS, wherein the BMS is connected to the first switch 1 and/or the second switch 2 via dry contacts of a lithium battery.
In this embodiment, the processor 3 adopts a BMS, which is a set of control system for protecting the safety of the power battery, and can constantly monitor the use state of the lithium battery pack and/or the lead-acid battery pack, and the BMS is connected to the first switch 1 and/or the second switch 2 through the dry contact of the lithium battery, thereby realizing the multiplexing of the dry contact of the lithium battery.
Of course, the processor 3 is not limited to the BMS, and the processor 3 is not particularly limited in the present application.
Referring to fig. 4, fig. 4 is a schematic structural diagram of a power supply system according to the present invention.
The invention also provides a power supply system, which comprises the protection device for mixed use of the lead-acid battery pack and the lithium battery pack, and also comprises:
the lithium battery pack is connected with a protection device which is used by mixing the lead-acid battery pack and the lithium battery pack;
and the lead-acid battery pack is connected with a protection device which is used by mixing the lead-acid battery pack and the lithium battery pack.
For the introduction of the power supply system provided by the present invention, please refer to the above embodiments of the present invention, which are not described herein again.
It is to be noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The utility model provides a protection device that lead acid battery group and lithium cell group combined use which characterized in that includes:
the first switch is connected in series with the lithium battery pack and the load loop;
a second switch connected in series between the lead-acid battery pack and the load circuit;
the processor is respectively connected with the control end of the first switch and the control end of the second switch, and is used for controlling the first switch to be closed and the second switch to be opened when a cut-off signal is received, so that the lithium battery pack supplies power to the load; and when the lithium battery pack discharges to be lower than a voltage threshold value, the first switch is controlled to be switched off, and the second switch is controlled to be switched on, so that the lead-acid battery pack supplies power to the load.
2. The protection device of claim 1, wherein the protection device comprises:
the rectifying module is connected with the power supply at the input end and the lithium battery pack and the lead-acid battery pack at the output end respectively and used for rectifying alternating current provided by the power supply into direct current;
the third switch is connected in series with the lithium battery pack and the rectifying module loop, and the control end of the third switch is connected with the processor;
the fourth switch is connected in series with the lead-acid battery pack and the rectifying module loop, and the control end of the fourth switch is connected with the processor;
the processor is further used for controlling the third switch and the fourth switch to be closed when a power supply signal is received, so that the power supply can charge the lithium battery pack and the lead-acid battery pack.
3. The protection device of claim 2, wherein the lead-acid battery is used in combination with a lithium battery, further comprising:
the monitoring module is used for sending the cut-off signal to the processor when monitoring that the power supply is cut off, and sending the power supply signal to the processor when monitoring that the power supply is electrified.
4. The protection device of claim 1, wherein the protection device comprises:
the rectifying module is connected with the power supply at the input end and the lithium battery pack and the lead-acid battery pack at the output end respectively and used for rectifying alternating current provided by the power supply into direct current;
the third switch is connected in series with the circuit of the lithium battery pack and the rectifying module, and the control end of the third switch is connected with the processor;
the fourth switch is connected in series with the circuit of the lead-acid battery pack and the rectifying module, and the control end of the fourth switch is connected with the processor;
the processor is further configured to determine whether the lead-acid battery pack discharges to the voltage threshold, and if so, control both the third switch and the fourth switch to be closed.
5. The protection device for a lead-acid battery pack and a lithium battery pack in hybrid use according to claim 4, wherein the step of judging whether the lead-acid battery pack is discharged to the voltage threshold value, and if so, the step of controlling the third switch and the fourth switch to be closed comprises the steps of:
and judging whether the discharge time of the lead-acid battery pack reaches a preset holding time, if so, judging that the lead-acid battery pack discharges to the voltage threshold, and controlling the third switch and the fourth switch to be closed.
6. The protection device of claim 1, wherein the lead-acid battery pack is composed of N groups of lead-acid battery packs, the N groups of lead-acid battery packs are connected in parallel, each group of lead-acid battery packs comprises M lead-acid batteries, the M lead-acid batteries are connected in series, and N, M is an integer not less than 1.
7. The protection device of claim 1, wherein the lithium battery pack is a P-pack, and the P-pack lithium battery packs are connected in parallel by dry contacts, wherein P is an integer not less than 1.
8. The protection device of claim 1, wherein the protection device comprises:
and the alarm module is connected with the processor and used for giving an alarm when the lithium battery pack discharges to a voltage lower than a voltage threshold value.
9. The protection device of any one of claims 1 to 8, wherein the processor is a Battery Management System (BMS), wherein the BMS is connected to the first switch and/or the second switch via dry contacts of the lithium battery.
10. A power supply system comprising a protection device for a lead-acid battery pack and a lithium battery pack according to any one of claims 1 to 9, further comprising:
the lithium battery pack is connected with a protection device which is used by mixing the lead-acid battery pack and the lithium battery pack;
and the lead-acid battery pack is connected with the protection device which is used by mixing the lead-acid battery pack and the lithium battery pack.
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| CN202011149545.0A CN112186860A (en) | 2020-10-23 | 2020-10-23 | Protection device and power supply system for mixed use of lead-acid battery pack and lithium battery pack |
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| CN202011149545.0A CN112186860A (en) | 2020-10-23 | 2020-10-23 | Protection device and power supply system for mixed use of lead-acid battery pack and lithium battery pack |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11462917B1 (en) | 2021-12-10 | 2022-10-04 | NDSL, Inc. | Methods, systems, and devices for maintenance and optimization of battery cabinets |
| CN115257599A (en) * | 2022-08-19 | 2022-11-01 | 奇瑞汽车股份有限公司 | Power supply method and system for automatic driving vehicle type |
| US11689048B1 (en) | 2021-12-10 | 2023-06-27 | NDSL, Inc. | Methods, systems, and devices for maintenance and optimization of battery cabinets |
-
2020
- 2020-10-23 CN CN202011149545.0A patent/CN112186860A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11462917B1 (en) | 2021-12-10 | 2022-10-04 | NDSL, Inc. | Methods, systems, and devices for maintenance and optimization of battery cabinets |
| US11689048B1 (en) | 2021-12-10 | 2023-06-27 | NDSL, Inc. | Methods, systems, and devices for maintenance and optimization of battery cabinets |
| CN115257599A (en) * | 2022-08-19 | 2022-11-01 | 奇瑞汽车股份有限公司 | Power supply method and system for automatic driving vehicle type |
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