CN220234253U - Base station multi-battery-pack collaborative discharging system - Google Patents
Base station multi-battery-pack collaborative discharging system Download PDFInfo
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- CN220234253U CN220234253U CN202321835359.1U CN202321835359U CN220234253U CN 220234253 U CN220234253 U CN 220234253U CN 202321835359 U CN202321835359 U CN 202321835359U CN 220234253 U CN220234253 U CN 220234253U
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- 238000007599 discharging Methods 0.000 title claims abstract description 34
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 51
- 238000012544 monitoring process Methods 0.000 claims abstract description 33
- 239000002253 acid Substances 0.000 claims description 17
- QSNQXZYQEIKDPU-UHFFFAOYSA-N [Li].[Fe] Chemical compound [Li].[Fe] QSNQXZYQEIKDPU-UHFFFAOYSA-N 0.000 claims description 11
- 238000000034 method Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 7
- 238000004891 communication Methods 0.000 description 5
- 230000007246 mechanism Effects 0.000 description 5
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 4
- 238000001514 detection method Methods 0.000 description 4
- 229910052744 lithium Inorganic materials 0.000 description 4
- 230000009467 reduction Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 241000271897 Viperidae Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The utility model belongs to the technical field of base station battery packs, and particularly discloses a base station multi-battery pack collaborative discharging system, wherein a battery pack comprises an original battery pack and a new battery pack; the primary battery set is connected with the direct current bus, the control signal output end of the monitoring unit is connected with the rectifying module of the originally configured switching power supply, and the primary battery set is configured with a first voltage sensor; the new battery pack is provided with a bidirectional DC/DC module and a second voltage sensor, and is connected with the direct current bus through the bidirectional DC/DC module; the monitoring unit controls the discharge of the primary battery pack through the rectifying module; the output end of the first voltage sensor and the output end of the second voltage sensor are respectively connected with the corresponding input end of the bidirectional DC/DC module, and the bidirectional DC/DC module controls the discharge of the new battery pack. By adopting the technical scheme, the discharge of the original battery pack and the new battery pack is controlled, the heavy current discharge is avoided so as to control the internal temperature rise of the battery pack and increase the risk of thermal runaway, and the safety of the base station is ensured.
Description
Technical Field
The utility model belongs to the technical field of base station battery packs, and relates to a base station multi-battery pack collaborative discharging system.
Background
In the long-term operation process of the public communication network mobile base station, the battery packs need to be additionally configured at regular intervals along with the attenuation of the battery capacity so as to meet the standby electricity duration of the base station communication equipment after alternating current power failure, or the battery packs need to be additionally configured along with the expansion of the base station load equipment. In the early-stage iron tower company and communication carrier, a large number of lead-acid batteries are adopted in the communication base station, in the later capacity expansion process, according to the capacity requirement of capacity expansion, the lead-acid batteries can be used continuously, or the capacity expansion of the lithium iron phosphate batteries can be adopted, but the combined use of new and old batteries, including the combination of the new and old lead-acid batteries or the combination of the lead-acid batteries and the lithium iron phosphate batteries, is realized by means of a battery combiner.
In order to control the cost, the base station battery may be configured with a combiner for only the newly expanded multiple sets of lead-acid batteries or lithium batteries during the capacity expansion process, as shown in fig. 1. The newly added lead-acid battery pack or lithium battery pack realizes charging voltage and current limiting management through the combiner module, the original lead-acid battery pack is kept unchanged and directly connected into a direct current bus of the switching power supply, and the monitoring unit of the switching power supply is utilized to realize charging voltage and current limiting management. When the base station is powered off and the battery is discharged, the battery combiner generally adopts a discharge management strategy similar to intelligent lithium battery: the newly added lead-acid battery pack or lithium battery pack at the rear end of the combiner module is discharged preferentially, and the smaller value constant current between the maximum discharge current of the combiner module and the base station load current is discharged until the newly added battery pack at the rear end of the combiner module is discharged until the low-voltage protection is achieved, if the battery pack directly connected on the direct current bus can be continuously discharged, the bus battery pack is continuously discharged independently on the base station load again until the discharging protection is achieved.
However, the strategy can lead to the continuous heavy-current independent load discharge of the battery pack at the rear end of the combiner and the direct-current bus end direct-connection battery pack in the discharging process. Under the condition that lead-acid batteries are adopted at any one end or both ends, the maximum discharge capacity and the longest standby time of the lead-acid battery pack of the base station cannot be realized because the battery combiner adopts the control logic of the prior discharge of the battery pack at the rear end after the power failure of the base station because of the electrochemical characteristics that the larger the discharge current of the lead-acid batteries, the smaller the actual effective discharge capacity and the larger the discharge current are, and the larger the actual effective discharge capacity is; under the condition that the iron lithium battery is adopted at any one end or both ends, the internal temperature rise of the iron lithium battery pack is higher under the condition of heavy current discharge, and the risk of thermal runaway is more easily increased, so that the potential safety hazard of the base station is caused.
Disclosure of Invention
The utility model aims to provide a base station multi-battery pack collaborative discharging system, which solves the problem that the internal temperature of the existing battery pack is increased under the condition of heavy current discharging, and the risk of thermal runaway is easily increased to cause potential safety hazard of a base station.
In order to achieve the above purpose, the basic scheme of the utility model is as follows: a base station multi-battery pack collaborative discharging system, wherein the battery pack comprises an original battery pack and a new battery pack;
the primary battery pack is directly connected with the direct current bus, the control signal output end of the monitoring unit is connected with the rectifying module of the originally configured switching power supply, and the primary battery pack is provided with a first voltage sensor;
the new battery pack is provided with a bidirectional DC/DC module and a second voltage sensor, and is connected with the direct current bus through the bidirectional DC/DC module;
the input end of the monitoring unit is respectively connected with the output end of the first voltage sensor and the output end of the second voltage sensor, and the monitoring unit controls the discharge of the primary battery pack through the rectifying module;
the output end of the first voltage sensor and the output end of the second voltage sensor are respectively connected with the corresponding input end of the bidirectional DC/DC module, and the bidirectional DC/DC module controls the discharge of the new battery pack.
The working principle and the beneficial effects of the basic scheme are as follows: and respectively acquiring the voltage change trend of the direct current bus of the base station, namely the discharge voltage of the original battery pack at the direct current bus end and the voltage change trend of the new battery pack at the rear end of the bidirectional DC/DC module by using the first voltage sensor and the second voltage sensor. The voltage values acquired by the first voltage sensor and the second voltage sensor are compared through the monitoring unit and the bidirectional DC/DC module, so that the current of the original battery pack and the current of the new battery pack are dynamically regulated, the convergence and equality of the discharge voltage of the original battery pack, which is directly connected with the bus, of the new battery pack at the rear end of the bidirectional DC/DC module in the discharge process are realized, and finally the discharge voltage is simultaneously reduced to a low-voltage protection threshold value of battery discharge. Thus, the heavy current discharge of the battery pack is avoided, the risks of controlling the internal temperature rise of the battery pack and increasing the thermal runaway are avoided, and the safety of the base station is ensured.
Further, the system also comprises a load current sensor, wherein the load current sensor is arranged at the load end of the direct current bus and is used for collecting the load current of the base station and transmitting the load current to the bidirectional DC/DC module.
And configuring a load current sensor, detecting the total load current of the base station in real time, and informing the bidirectional DC/DC module so that the follow-up bidirectional DC/DC module can control the discharge current of the battery.
Further, the system also comprises an alternating current power supply acquisition module, wherein the input end of the alternating current power supply acquisition module is connected with the mains supply input end of the base station and is used for detecting an external mains supply signal and transmitting the external mains supply signal to the bidirectional DC/DC module, and the control signal output end of the bidirectional DC/DC module is respectively connected with the discharge control ends of the new battery pack and the original battery pack.
And detecting the mains supply information, and judging whether the alternating current is in power failure or not so as to control the discharge of the original battery pack and the new battery pack.
Further, the system also comprises a battery pack capacity detection mechanism, wherein the battery pack capacity detection mechanism respectively collects the capacities of the newly-added battery pack and the directly-connected battery pack and inputs the capacities into the bidirectional DC/DC module.
According to the capacities of the new battery pack and the original battery pack, the bidirectional DC/DC module can distribute respective initial discharge voltages, and the independent load heavy current discharge of one battery pack is avoided.
Further, the monitoring unit comprises a first comparator and a first PWM controller, wherein the input end of the first comparator is respectively connected with the output ends of the first voltage sensor and the second voltage sensor, and the output end of the first comparator is connected with the discharge current control end of the primary battery pack through the first PWM controller.
The first comparator is used for comparing the values of the voltage signals acquired by the first voltage sensor and the second voltage sensor, so that the discharge current of the original battery pack is dynamically adjusted, and the structure is simple.
Further, the bidirectional DC/DC module comprises a second comparator and a second PWM controller, the input end of the second comparator is respectively connected with the output ends of the second voltage sensor and the first voltage sensor, the output end of the second comparator is connected with the discharge current control end of the new battery pack through the second PWM controller, and the bidirectional DC/DC module adjusts the discharge current of the new battery pack and controls the discharge operation of the original battery pack through the monitoring unit.
And the second comparator is used for comparing the values of the voltage signals acquired by the first voltage sensor and the second voltage sensor, so as to control the discharge current of the new battery pack, realize convergence and equality of the discharge voltages of the new battery pack and the original battery pack in the discharge process, and realize simple operation.
Further, the original battery pack and the new battery pack are made of any two of new lead acid, old lead acid, step iron lithium, common iron lithium and retired iron lithium of the battery changing cabinet.
And a proper battery pack is selected according to the requirement, so that the battery pack is convenient to use.
Further, the intelligent monitoring system also comprises a movable ring monitoring unit, wherein the bidirectional DC/DC module and the monitoring unit transmit collected information to the movable ring monitoring unit through an intelligent data interface.
And the movable ring monitoring unit is utilized to collect the collected corresponding information, so that the operator can check the information conveniently.
Drawings
FIG. 1 is a schematic diagram of a capacity expansion structure of a conventional base station battery in the background art of the utility model;
fig. 2 is a schematic structural diagram of a base station multi-battery cooperative discharging system according to the present utility model.
Detailed Description
Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.
In the description of the present utility model, it should be understood that the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present utility model and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.
In the description of the present utility model, unless otherwise specified and defined, it should be noted that the terms "mounted," "connected," and "coupled" are to be construed broadly, and may be, for example, mechanical or electrical, or may be in communication with each other between two elements, directly or indirectly through intermediaries, as would be understood by those skilled in the art, in view of the specific meaning of the terms described above.
The utility model discloses a base station multi-battery pack collaborative discharging system, as shown in figure 2, a battery pack comprises an original battery pack and a new battery pack. Preferably, the original battery pack and the new battery pack are any two combinations of new lead acid, old lead acid, cascade iron lithium, common iron lithium and retired iron lithium of the battery changing cabinet. And a proper battery pack is selected according to the requirement, so that the battery pack is convenient to use.
The primary battery set is directly and electrically connected with the direct current bus, and the control signal output end of the monitoring unit (CSU, channel Service Unit, also called channel service unit) is electrically connected with the rectifying module of the originally configured switching power supply. The primary battery pack is provided with a first voltage sensor, and the input end of the first voltage sensor is electrically connected with the discharge end of the primary battery pack and is used for collecting discharge voltage information of the primary battery pack. The voltage sensor used in the utility model is preferably, but not limited to, an MIK-DZV single-phase direct current voltage sensor.
The new battery pack is provided with a bidirectional DC/DC module and a second voltage sensor, and the new battery pack is electrically connected with the direct current bus through the bidirectional DC/DC module. The input end of the second voltage sensor is electrically connected with the discharge end of the new battery pack and is used for collecting the discharge voltage information of the new battery pack.
The input end of the monitoring unit is electrically connected with the output end of the first voltage sensor and the output end of the second voltage sensor respectively, and the monitoring unit controls the discharge of the primary battery pack through the rectifying module; the voltage values acquired by the first voltage sensor and the second voltage sensor are compared through the monitoring unit, so that the current of the primary battery pack is dynamically adjusted. When the voltage value acquired by the first voltage sensor is larger than the voltage value acquired by the second voltage sensor, the monitoring unit dynamically reduces the discharge current of the original battery pack; otherwise, the discharge current of the primary battery pack is dynamically increased.
The output end of the first voltage sensor and the output end of the second voltage sensor are respectively and electrically connected with the corresponding input end of the bidirectional DC/DC module, and the bidirectional DC/DC module controls the discharge of the new battery pack. And comparing the voltage values acquired by the first voltage sensor and the second voltage sensor through the bidirectional DC/DC module, thereby dynamically adjusting the current of the new battery pack. When the voltage value acquired by the first voltage sensor is larger than the voltage value acquired by the second voltage sensor, the bidirectional DC/DC module dynamically increases the discharge current of the new battery pack; otherwise, the discharge current of the new battery pack is dynamically reduced. Therefore, the discharging voltage of the new battery pack at the rear end of the bidirectional DC/DC module and the discharging voltage of the original battery pack directly connected with the bus are converged and equal in the discharging process, and finally, the discharging voltage is reduced to the low-voltage protection threshold value of battery discharging at the same time. The base station multi-battery-pack collaborative discharging system further comprises a load current sensor (such as a Hall type current sensor of SZ 1K-50), wherein the load current sensor is arranged at a load end of the direct current bus and used for collecting the total load current of the base station in real time and transmitting the total load current to the bidirectional DC/DC module. The total current collected by the load current sensor, namely the self discharge current of the bidirectional DC/DC module, is equal to the discharge current of the original battery of the base station, and the output ratio of the bidirectional DC/DC module to the original battery current is adjusted by outputting the boost or the output buck of the bidirectional DC/DC module. The high-current discharge of the battery pack is avoided, the risks of controlling the internal temperature rise of the battery pack and increasing the thermal runaway are avoided, and the safety of the base station is ensured.
In a preferred embodiment of the present utility model, the monitoring unit includes a first comparator and a first PWM controller, the comparator used in the present utility model is preferably, but not limited to, LM324, LM339, and the PWM controller may use ST viper plus series, etc. The input end of the first comparator is electrically connected with the output ends of the first voltage sensor and the second voltage sensor respectively, and the output end of the first comparator is electrically connected with the discharge current control end of the primary battery pack through the first PWM controller. The output end of the first comparator is directly connected with the discharging current reducing control end of the original battery pack through the first PWM controller, and the output end of the first comparator is electrically connected with the discharging current increasing control end of the original battery pack through the first PWM controller after passing through the NOT gate.
The first comparator compares the magnitude of the voltage signal values acquired by the first voltage sensor and the second voltage sensor, and when the voltage value acquired by the first voltage sensor is larger than the voltage value acquired by the second voltage sensor, the first comparator outputs a high-level reduction control signal to a reduction discharge current control end of the primary battery pack, so that the discharge current of the primary battery pack is reduced. On the contrary, the low level output by the first comparator is high level after passing through the NOT gate, and the high level is transmitted to the discharge current increasing control end of the primary battery pack to increase the discharge current of the primary battery pack.
In a preferred scheme of the utility model, the bidirectional DC/DC module comprises a second comparator and a second PWM controller, wherein the input end of the second comparator is electrically connected with the output ends of the second voltage sensor and the first voltage sensor respectively, and the output end of the second comparator is electrically connected with the discharge current control end of the new battery pack through the second PWM controller. Similarly, the output end of the second comparator is directly electrically connected with the discharge current increasing control end of the original battery pack through the second PWM controller, and the output end of the second comparator is electrically connected with the discharge current decreasing control end of the new battery pack through the second PWM controller after passing through the NOT gate.
When the voltage value acquired by the first voltage sensor is larger than the voltage value acquired by the second voltage sensor, the second comparator outputs a high-level increase control signal to the increase discharge current control end of the new battery pack, and the discharge current of the new battery pack is increased. And on the contrary, the low level output by the second comparator is high level after passing through the NOT gate, and the high level is transmitted to the discharge current reduction control end of the new battery pack, so that the discharge current of the new battery pack is reduced.
The bidirectional DC/DC module regulates the discharge current of the new battery pack, which is opposite to the discharge operation of the original battery pack controlled by the monitoring unit.
In a preferred scheme of the utility model, the base station multi-battery pack collaborative discharging system further comprises an alternating current power supply acquisition module, wherein the input end of the alternating current power supply acquisition module is electrically connected with the mains supply input end of the base station and is used for detecting an external mains supply signal and transmitting the external mains supply signal to the bidirectional DC/DC module. The alternating current power supply acquisition module can also adopt a voltage sensor or a current sensor, and the control signal output end of the bidirectional DC/DC module is respectively and electrically connected with the discharge control ends of the new battery pack and the original battery pack. And detecting the mains supply information, and judging whether the alternating current is in power failure or not so as to control the discharge of the original battery pack and the new battery pack.
More preferably, the base station multi-battery cooperative discharging system further comprises a battery capacity detecting mechanism, wherein the battery capacity detecting mechanism respectively collects the capacities of the newly-added battery and the directly-connected battery and inputs the capacities into a bidirectional DC/DC module, and the bidirectional DC/DC module distributes initial discharging currents of the new battery and the original battery. And according to the capacities of the new battery pack and the original battery pack, the initial discharge current of each battery pack is distributed, and the independent load heavy current discharge of one battery pack is avoided. The specific battery pack capacity detection mechanism may employ a coulometer (e.g., BQ76920 coulometer chip for TI) or an impedance tracking meter detection device. The initial discharge current of the new battery pack and the original battery pack can be set and can be randomly distributed; the initial discharge current may be allocated according to the capacity percentages of the new battery pack and the original battery pack, and the method adopts the prior art, which is not an improvement point of the present utility model and will not be described herein.
In a preferred scheme of the utility model, the base station multi-battery pack collaborative discharging system further comprises a movable ring monitoring unit (FSU), and the bidirectional DC/DC module and the monitoring unit transmit collected information to the movable ring monitoring unit through intelligent data interfaces (such as an RS485 interface, an RS232 interface, an RS422 interface and the like). And the movable ring monitoring unit is utilized to collect the collected corresponding information, so that the operator can check the information conveniently.
According to the technical scheme, through the base station battery combiner (namely the bidirectional DC/DC module), an improved battery discharge control strategy is adopted, a new battery pack at the rear end of the combiner or a primary battery pack directly connected with a direct current bus is realized, the respective maximum effective capacity is discharged as far as possible under the direct current load condition after the alternating current power failure of the base station, and the standby time of the base station is controlled well. Or the new battery pack and the original battery pack are realized, under the direct current load condition after the alternating current power failure of the base station, the heavy current discharge is avoided as much as possible so as to control the internal temperature rise of the battery pack and increase the risk of thermal runaway, and the safety of the base station is ensured.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.
Claims (8)
1. A base station multi-battery cooperative discharging system, which is characterized in that the battery comprises an original battery and a new battery;
the primary battery pack is directly connected with the direct current bus, the control signal output end of the monitoring unit is connected with the rectifying module of the originally configured switching power supply, and the primary battery pack is provided with a first voltage sensor;
the new battery pack is provided with a bidirectional DC/DC module and a second voltage sensor, and is connected with the direct current bus through the bidirectional DC/DC module;
the input end of the monitoring unit is respectively connected with the output end of the first voltage sensor and the output end of the second voltage sensor, and the monitoring unit controls the discharge of the primary battery pack through the rectifying module;
the output end of the first voltage sensor and the output end of the second voltage sensor are respectively connected with the corresponding input end of the bidirectional DC/DC module, and the bidirectional DC/DC module controls the discharge of the new battery pack.
2. The base station multi-battery cooperative discharging system of claim 1, further comprising a load current sensor mounted on a load end of the direct current bus for collecting a load current of the base station and transmitting the load current to the bidirectional DC/DC module.
3. The base station multi-battery cooperative discharging system according to claim 2, further comprising an alternating current power supply acquisition module, wherein an input end of the alternating current power supply acquisition module is connected with a mains supply input end of the base station and is used for detecting an external mains supply signal and transmitting the external mains supply signal to the bidirectional DC/DC module, and a control signal output end of the bidirectional DC/DC module is connected with discharge control ends of the new battery and the original battery respectively.
4. The base station multi-battery cooperative discharging system as recited in claim 3, further comprising a battery capacity detecting means for respectively collecting capacities of the newly added battery and the directly connected battery and inputting the capacities to the bidirectional DC/DC module.
5. The base station multi-battery cooperative discharging system according to claim 1, wherein the monitoring unit comprises a first comparator and a first PWM controller, the input end of the first comparator is connected with the output ends of the first voltage sensor and the second voltage sensor respectively, and the output end of the first comparator is connected with the discharging current control end of the primary battery through the first PWM controller.
6. The base station multi-battery cooperative discharging system as claimed in claim 1, wherein the bidirectional DC/DC module comprises a second comparator and a second PWM controller, wherein the input end of the second comparator is connected with the output ends of the second voltage sensor and the first voltage sensor, respectively, the output end of the second comparator is connected with the discharging current control end of the new battery through the second PWM controller, and the bidirectional DC/DC module adjusts the discharging current of the new battery in reverse to the discharging operation of the monitoring unit controlling the original battery.
7. The base station multi-battery collaborative discharge system according to claim 1, wherein the original battery pack and the new battery pack are any two of new lead acid, old lead acid, step iron lithium, common iron lithium and battery cabinet retired iron lithium.
8. The base station multi-battery cooperative discharging system of claim 1, further comprising a moving ring monitoring unit, wherein the bidirectional DC/DC module and the monitoring unit transmit the collected information to the moving ring monitoring unit through an intelligent data interface.
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| CN202321835359.1U CN220234253U (en) | 2023-07-12 | 2023-07-12 | Base station multi-battery-pack collaborative discharging system |
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| CN202321835359.1U CN220234253U (en) | 2023-07-12 | 2023-07-12 | Base station multi-battery-pack collaborative discharging system |
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| CN220234253U true CN220234253U (en) | 2023-12-22 |
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