Application system for prolonging service life of storage battery

Abstract

The invention discloses a storage battery life prolonging application system, and relates to the technical field of storage batteries, and the system comprises a storage battery pack which is electrically connected to a load and is used for supplying power to the load; the step-up / step-down power module is electrically connected to the storage battery pack and the normal power supply network; the single trickle charging module is electrically connected to the storage battery pack and the step-up / step-down power module; the controller is electrically connected to the step-up / step-down power module and the single trickle charging module; wherein the storage battery pack comprises a plurality of single batteries which are connected in series, the step-up / step-down power module is used for adjusting voltage and charging the storage battery pack in a series charging mode, and the single trickle charging module carries out trickle charging on each single battery of the storage battery pack based on the output of the controller. The service life of the battery pack of the communication base station can be prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of storage batteries, and in particular to a storage battery life extension application system. Background Art

[0002] Currently, most communication base stations have backup batteries, most of which have capacities ranging from 100AH ​​to 800AH. Many batteries are in floating charge for a long time, and the battery packs are very polarized. In many cases, they begin to show varying degrees of capacity attenuation within less than two years of use.

[0003] Due to the capacity differences of the battery cells in the battery pack, the battery cell voltage is directly unbalanced during charging and discharging, with some battery cells having high voltages and some having low voltages. In this way, cells with too high voltages will be damaged due to high voltages, and cells with too low voltages will slowly sulfide due to being in an undervoltage state for a long time, thereby aggravating the attenuation of the capacity of the entire battery pack. Therefore, after less than three years of use, the capacity of the battery packs of many base stations has decayed to the point where they can no longer be used. Therefore, this application provides a new technical solution. Summary of the invention

[0004] In order to extend the service life of the battery pack of a communication base station, the present application provides a battery life extension application system.

[0005] The present application provides a battery life extension application system, which adopts the following technical solutions:

[0006] A battery life extension application system, comprising:

[0007] A battery pack, which is electrically connected to the load and is used to supply power to the load;

[0008] a step-up / step-down power module electrically connected to a battery pack and a normal power supply network; and

[0009] A single-cell trickle charging module electrically connected to the battery pack and the step-up / step-down power module;

[0010] A controller electrically connected to the step-up / step-down power module and the single-cell trickle charging module;

[0011] The battery pack includes a plurality of battery cells connected in series, the step-up / step-down power module is used to adjust the voltage and charge the battery pack in a series charging manner, and the cell trickle charging module performs trickle charging on each battery cell of the battery pack based on the output of the controller.

[0012] Optionally, the step-up / step-down power module includes:

[0013] An inductor L, which is connected in series to the positive electrode of the battery pack;

[0014] MOS tube Q1 is selected as N-channel enhancement type, its source is connected to one end of the inductor L, the drain is used to connect to the positive electrode of the load, and the gate is connected to the controller;

[0015] MOS tube 2 Q2 is selected as an N-channel enhancement type, with its source connected to the ground, its drain connected to the connection point of the inductor L and the source of MOS tube 1 Q1, and its gate connected to the controller;

[0016] A capacitor C1, one end of which is connected to the connection point between the inductor L and the positive electrode of the battery pack, and the other end is grounded;

[0017] Capacitor 2 C2 has one end connected to the connection point between the drain of MOS tube Q1 and the positive electrode of the load, and the other end connected to the ground.

[0018] Optionally, the single-cell trickle charging module includes:

[0019] MOS tube 3 Q3 is selected as N-channel depletion type, with its drain connected to the drain of MOS tube 1 Q1, its source grounded, and its gate connected to the controller;

[0020] Diode 1 D1, with its anode connected to the drain of MOS tube 3 Q3, and its cathode connected to the drain of MOS tube 1 Q1;

[0021] A resistor R is connected in series between the cathode of the diode D1 and the drain of the MOS tube Q1;

[0022] Capacitor three C3 is arranged in parallel with resistor R;

[0023] The adjustable transformer T has one end of the primary winding connected to the connection point of the resistor R and the drain of the MOS tube Q1, the other end of the primary winding connected to the connection point of the positive electrode of the diode D1 and the drain of the MOS tube Q3, one end of the secondary winding connected to the positive electrode of the battery pack, and the other end of the secondary winding grounded;

[0024] Diode 2 D2, its anode is connected to one end of the secondary winding of the adjustable transformer T, and its cathode is connected to the positive electrode of the battery pack;

[0025] The inductor LC is connected in series between the cathode of the diode D2 and the anode of the battery pack;

[0026] The trickle charge switching circuit has an input side electrically connected to the inductor LC, and an output side electrically connected to the battery pack.

[0027] Optionally, the trickle charge switching circuit includes a relay K1 and a split relay K2;

[0028] The relay K1 is a double-pole double-throw relay, and the clamp is connected in series with the secondary winding of the adjustable transformer T, the knife is connected to the split relay K2, and the coil is connected to the controller;

[0029] The split relay K2 is multiple and arranged in parallel, and the two ends of the parallel connection are respectively connected to the knife of the relay K1 and the battery pack;

[0030] The split relay K2 is a single-pole single-throw relay, the coil of which is connected to the controller, and each clamping plate of the split relay K2 is connected in series with a battery cell, and the knife of each split relay K2 is connected to the knife of the relay K1.

[0031] Optionally, a diode D3 is further included, wherein the positive electrode of the diode D3 is connected to one end of the secondary winding of the adjustable transformer T, and the negative electrode is connected to the connection point between the negative electrode of the diode D2 and the inductor LC.

[0032] Optionally, it also includes capacitor C4 and capacitor C5, both of which are polarized capacitors, the positive electrode of capacitor C4 is connected to the connection point between the inductor L and the positive electrode of the battery, and the negative electrode is grounded; the positive electrode of capacitor C5 is connected to the connection point between the drain of MOS tube Q1 and the positive electrode of the load, and the negative electrode is grounded.

[0033] Optionally, the controller is configured as:

[0034] If the predefined mains power outage condition is met and the battery pack output voltage is less than the preset load requirement voltage, the step-up / step-down power module is controlled to step up the voltage;

[0035] If the predefined charging conditions are met, the step-up / step-down power module is controlled to step down the charging until the voltage of the battery pack meets the preset series charging termination conditions; wherein the series charging termination conditions include: when the series charging voltage reaches the preset series charging voltage value, the charging current is controlled to drop to zero, and the maximum voltage of each battery cell is not higher than the preset cell nominal voltage value;

[0036] If the preset series charging end condition is met, the cell voltage value of each battery cell is obtained;

[0037] Based on the voltage value of each monomer, control the monomer trickle charging module to execute the preset monomer supplementary charging process;

[0038] The single-cell supplementary charging process includes: trickle charging the battery cells whose cell voltage values ​​are lower than the preset cell charging voltage values;

[0039] When the charging voltage of a battery cell reaches a preset single cell charging voltage value, the current is controlled to drop to zero, and the trickle charging is switched to the next battery cell until the charging voltage of all battery cells in the battery pack reaches the preset single cell charging voltage value and then stops.

[0040] Optionally, the controller is further configured as:

[0041] Obtain and record the actual charging time of each battery cell;

[0042] Based on the theoretical charging time of each battery cell obtained from the designated cloud, the factory capacity of the battery cell and the actual charging time, the capacity attenuation of each battery cell is estimated;

[0043] If the capacity attenuation of a battery cell is lower than a preset threshold, a preset battery cell replacement prompt is output.

[0044] To summarize, the present application includes the following beneficial technical effects: when the AC power is restored, the battery pack is first charged in series through the step-up / step-down power module. When the series charging voltage reaches the preset voltage and ensures that the charging current drops to zero, the series charging of the entire battery pack is completed; then the single cell trickle charging module is started to trickle charge each battery cell in turn until all cells in the entire battery pack reach the preset charging voltage before charging can be stopped, that is, the function of replenishing all cells is completed, thereby achieving the effect of fully charging the entire battery pack, solving the problem of inconsistent capacity between cells in the battery pack, and still enabling each battery cell to obtain sufficient charging voltage. At the same time, it also reduces the situation where the single cell voltage is too high during series charging and accelerates battery damage, thereby extending the service life of the battery pack of the communication base station. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 is a system block diagram of an embodiment of the present application;

[0046] Figure 2 Schematic diagram of the circuit structure of the step-up / step-down power module in the embodiment of the present application;

[0047] Figure 3 It is a schematic diagram of the circuit structure of a single-cell trickle charging module in an embodiment of the present application. DETAILED DESCRIPTION

[0048] The following is combined with Figure 1-3 This application is described in further detail.

[0049] The embodiment of the present application discloses a battery life extension application system.

[0050] Reference Figure 1The battery life extension application system includes a battery pack, a step-up / step-down power module, a single-cell trickle charging module, and a controller, wherein the battery pack is electrically connected to the load for supplying power to the load (communication base station), and the step-up / step-down power module is electrically connected to the battery pack and the normal power supply network. In this embodiment, the normal power supply network includes a DC panel system that converts the AC input from the power grid into DC power. In other embodiments, it may also include an AC distribution unit, a DC distribution unit, and a rectifier transformer. The single-cell trickle charging module is electrically connected to the battery pack and the step-up / step-down power module, and the controller is electrically connected to the step-up / step-down power module and the single-cell trickle charging module.

[0051] Among them, the battery pack includes multiple battery cells connected in series, for example, BT0-BT4 respectively, the step-up / step-down power module is used to adjust the voltage and charge the battery pack in a series charging manner, and the single cell trickle charging module trickle charges each battery cell of the battery pack based on the output of the controller.

[0052] Through the above arrangement, when the AC power is restored, the battery group is first charged in series through the step-up / step-down power module. When the series charging voltage reaches the preset voltage and ensures that the charging current drops to zero, the series charging of the entire battery group is completed; then the single cell trickle charging module is started to trickle charge each battery cell in turn until all cells of the entire battery group reach the preset charging voltage before stopping the charging, that is, completing the charging function of all cells, so as to achieve the effect of fully charging the entire battery group, solving the problem of inconsistent capacity between cells of the battery group, and still enabling each battery cell to obtain sufficient charging voltage. At the same time, it also reduces the situation where the single cell voltage is too high during series charging and accelerates the damage to the battery, thereby extending the service life of the battery group of the communication base station.

[0053] The following is a detailed explanation:

[0054] The step-up / step-down power module includes:

[0055] Inductor L is a hollow inductor connected in series to the positive electrode of the battery pack;

[0056] MOS tube Q1, its source is connected to one end of the inductor L, its drain is used to connect to the positive electrode of the load, and its gate is connected to the controller through a protection resistor;

[0057] MOS tube 2 Q2, with its source connected to the ground, its drain connected to the connection point of the inductor L and the source of MOS tube 1 Q1, and its gate connected to the controller;

[0058] Capacitor 1 C1, which is a non-polar capacitor, one end of which is connected to the connection point between the inductor L and the positive electrode of the battery pack, and the other end is grounded;

[0059] The capacitor C2 is a non-polar capacitor, one end of which is connected to the connection point between the drain of the MOS tube Q1 and the positive electrode of the load, and the other end is grounded.

[0060] Through the above settings, when the city power is cut off, when the output voltage of the entire battery group is insufficient, that is, when it cannot reach the normal load required voltage, the load is boosted to obtain a normal supply voltage, thereby maintaining normal operation of the load. When the AC power is restored, the battery group is charged in series through the boost / buck power module.

[0061] The single-cell trickle charging module includes:

[0062] MOS tube three Q3, its drain is connected to the drain of MOS tube one Q1, its source is grounded, and its gate is connected to the controller (PWM drive output end);

[0063] Diode 1 D1, with its anode connected to the drain of MOS tube 3 Q3, and its cathode connected to the drain of MOS tube 1 Q1;

[0064] A resistor R is connected in series between the cathode of the diode D1 and the drain of the MOS tube Q1;

[0065] Capacitor three C3 is arranged in parallel with resistor R;

[0066] The adjustable transformer T has one end of the primary winding connected to the connection point between the resistor R and the drain of the MOS tube Q1, i.e., CHG_Vcc, the other end of the primary winding connected to the connection point between the positive electrode of the diode D1 and the drain of the MOS tube Q3, one end of the secondary winding connected to the positive electrode of the battery pack, and the other end of the secondary winding connected to the ground;

[0067] Diode 2 D2, its anode is connected to one end of the secondary winding of the adjustable transformer T, and its cathode is connected to the positive electrode of the battery pack;

[0068] The inductor LC is a magnetic core inductor, which is connected in series between the cathode of the diode D2 and the anode of the battery pack;

[0069] The trickle charge switching circuit has an input side electrically connected to the inductor LC, and an output side electrically connected to the battery pack.

[0070] Among them, the trickle charge switching circuit includes a relay K1 and a split relay K2;

[0071] Relay K1 is a double-pole double-throw relay, and the clamp is connected in series with the secondary winding of the adjustable transformer T, the knife is connected to the split relay K2, and the coil is connected to the controller (the relay output end), that is, RLY-DRV;

[0072] The split relay K2 is multiple and is arranged in parallel, and the two ends of the parallel connection are respectively connected to the knife of the relay K1 and the battery pack;

[0073] The split relay K2 is a single-pole single-throw relay, the coil is connected to the controller, namely RLY-C1 / 2 / 3 / 4, and each split relay K2's clamp is connected in series with a battery cell, and each split relay K2's knife is connected to the knife of relay K1.

[0074] It can be understood that the function of the relay K1 is to conduct the power supply circuits of the multiple split relays K2, thereby controlling whether to recharge the battery pack, and the function of the split relay K2 is to recharge each battery cell in turn.

[0075] In this embodiment, there are three battery cells in the battery pack, so four split relays K2 are set, and the knives of two split relays K2 are set in parallel. Since the relay K1 is a double-pole double-throw, the connection points of the knives of two split relays K2 are connected in parallel in series with the two knives of the relay K1 respectively; the positive and negative poles of each battery cell are connected to the clamping plates of two split relays K2 respectively.

[0076] Through the above arrangement, the two split relays K2 are controlled to be turned on to supplement the power of a certain battery cell.

[0077] In another embodiment of the present application, a diode D3 is further included, wherein the positive electrode of the diode D3 is connected to one end of the secondary winding of the adjustable transformer T, and the negative electrode is connected to the connection point between the negative electrode of the diode D2 and the inductor LC.

[0078] Through the above settings, the voltage is stabilized.

[0079] In another embodiment of the present application, capacitor C4 and capacitor C5 are also included. Both capacitor C4 and capacitor C5 are polarized capacitors. The positive electrode of capacitor C4 is connected to the connection point between the inductor L and the positive electrode of the battery, and the negative electrode is grounded. The positive electrode of capacitor C5 is connected to the connection point between the drain of MOS tube Q1 and the positive electrode of the load, and the negative electrode is grounded. The above configuration is used to suppress high-frequency noise and peak voltage of MOS tube Q1 and MOS tube Q2, and protect circuit components.

[0080] In another embodiment of the present application, the controller is configured as:

[0081] If the predefined city power outage condition is met (no AC input), and the battery pack output voltage is less than the preset load requirement voltage (the voltage required for the communication base station to operate), the step-up / step-down power module is controlled to step up the voltage;

[0082] If the predefined charging conditions are met (mains power is restored, there is AC input), the step-up / step-down power module is controlled to step down and charge until the voltage of the battery pack meets the preset series charging termination conditions; wherein the series charging termination conditions include: when the series charging voltage reaches the preset series charging voltage value, the charging current is controlled to drop to zero, and the maximum voltage of each battery cell is not higher than the preset cell nominal voltage value (to prevent overcharging);

[0083] If the preset series charging end condition is met, the cell voltage value of each battery cell (the current voltage value of the battery cell) is obtained;

[0084] Based on the voltage value of each monomer, control the monomer trickle charging module to execute the preset monomer supplementary charging process;

[0085] The single-cell supplementary charging process includes: trickle charging the battery cells whose single-cell voltage value is lower than the preset single-cell charging voltage value;

[0086] When the charging voltage of a battery cell reaches a preset single cell charging voltage value, the current is controlled to drop to zero, and the trickle charging is switched to the next battery cell until the charging voltage of all battery cells in the battery pack reaches the preset single cell charging voltage value and then stops.

[0087] Through the above settings, when the city power is cut off, when the output voltage of the whole battery group is not enough, that is, when it cannot reach the normal load required voltage, the load is provided with a normal supply voltage by boosting, so as to maintain the normal operation of the load. When the AC power is restored, the battery group is first charged in series through the boost / step-down power module. When the series charging voltage reaches the preset voltage and ensures that the charging current drops to zero, and the maximum voltage of the battery cell cannot be higher than the preset single cell nominal voltage value, the series charging of the whole battery group is completed. Then, the single cell trickle charging module is started to trickle charge the battery whose current battery cell voltage is lower than the preset single cell charging voltage value. For 2V batteries, the charging voltage is generally 2.35V to 2.37V. When the charging voltage reaches the preset charging voltage value, the current is dropped to zero, and then the next battery cell is switched to continue trickle charging. Charging can be stopped only after all cells of the whole battery group reach the preset charging voltage, that is, the supplementary power function of all cells is completed, so as to achieve the effect that the whole battery group can be fully charged, and the service life of the battery group of the communication base station is extended.

[0088] In another embodiment of the present application, the controller is further configured to:

[0089] Obtain and record the actual charging time of each battery cell;

[0090] By comparing the theoretical charging time of each battery cell obtained from the specified cloud, the factory capacity of the battery cell, and the actual charging time, the capacity attenuation of each battery cell is estimated;

[0091] If the capacity attenuation of a battery cell is lower than a preset threshold, a preset battery cell replacement prompt is output.

[0092] It is understandable that the designated cloud can be a third-party battery manufacturer platform, from which the theoretical charging time and factory capacity of the battery cells can be obtained. By comparing with the actual charging time, the capacity attenuation of each battery cell compared to the factory capacity can be estimated, which can be expressed in the form of a percentage. If it is lower than the preset threshold, the relevant management party will be reminded to replace it.

[0093] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A battery life extension application system, characterized in that: include: A battery pack, which is electrically connected to the load and is used to supply power to the load; a step-up / step-down power module electrically connected to a battery pack and a normal power supply network; and A single-cell trickle charging module electrically connected to the battery pack and the step-up / step-down power module; A controller electrically connected to the step-up / step-down power module and the single-cell trickle charging module; The battery pack includes a plurality of battery cells connected in series, the step-up / step-down power module is used to adjust the voltage and charge the battery pack in a series charging manner, and the cell trickle charging module performs trickle charging on each battery cell of the battery pack based on the output of the controller.

2. The battery life extension application system according to claim 1, characterized in that: The step-up / step-down power module comprises: An inductor L, which is connected in series to the positive electrode of the battery pack; MOS tube Q1, its source is connected to one end of the inductor L, its drain is used to connect to the positive electrode of the load, and its gate is connected to the controller; MOS tube 2 Q2, with its source connected to the ground, its drain connected to the connection point of the inductor L and the source of MOS tube 1 Q1, and its gate connected to the controller; A capacitor C1, one end of which is connected to the connection point between the inductor L and the positive electrode of the battery pack, and the other end is grounded; Capacitor 2 C2 has one end connected to the connection point between the drain of MOS tube Q1 and the positive electrode of the load, and the other end connected to the ground.

3. The battery life extension application system according to claim 2, characterized in that: The single-cell trickle charging module comprises: MOS tube three Q3, its drain is connected to the drain of MOS tube one Q1, its source is grounded, and its gate is connected to the controller; Diode 1 D1, with its anode connected to the drain of MOS tube 3 Q3, and its cathode connected to the drain of MOS tube 1 Q1; A resistor R is connected in series between the cathode of the diode D1 and the drain of the MOS tube Q1; Capacitor three C3 is arranged in parallel with resistor R; The adjustable transformer T has one end of the primary winding connected to the connection point of the resistor R and the drain of the MOS tube Q1, the other end of the primary winding connected to the connection point of the positive electrode of the diode D1 and the drain of the MOS tube Q3, one end of the secondary winding connected to the positive electrode of the battery pack, and the other end of the secondary winding grounded; Diode 2 D2, its anode is connected to one end of the secondary winding of the adjustable transformer T, and its cathode is connected to the positive electrode of the battery pack; The inductor LC is connected in series between the cathode of the diode D2 and the anode of the battery pack; The trickle charge switching circuit has an input side electrically connected to the inductor LC, and an output side electrically connected to the battery pack.

4. The battery life extension application system according to claim 3, characterized in that: The trickle charge switching circuit includes a relay K1 and a split relay K2; The relay K1 is a double-pole double-throw relay, and the clamp is connected in series with the secondary winding of the adjustable transformer T, the knife is connected to the split relay K2, and the coil is connected to the controller; The split relay K2 is multiple and arranged in parallel, and the two ends of the parallel connection are respectively connected to the knife of the relay K1 and the battery pack; The split relay K2 is a single-pole single-throw relay, the coil of which is connected to the controller, and each clamping plate of the split relay K2 is connected in series with a battery cell, and the knife of each split relay K2 is connected to the knife of the relay K1.

5. The battery life extension application system according to claim 3, characterized in that: It also includes a diode D3, wherein the positive electrode of the diode D3 is connected to one end of the secondary winding of the adjustable transformer T, and the negative electrode is connected to the connection point of the negative electrode of the diode D2 and the inductor LC.

6. The battery life extension application system according to claim 2, characterized in that: It also includes capacitor C4 and capacitor C5, both of which are polarized capacitors. The positive electrode of capacitor C4 is connected to the connection point between the inductor L and the positive electrode of the battery, and the negative electrode is grounded; the positive electrode of capacitor C5 is connected to the connection point between the drain of MOS tube Q1 and the positive electrode of the load, and the negative electrode is grounded.

7. The battery life extension application system according to claim 1, characterized in that: The controller is configured as follows: If the predefined mains power outage condition is met and the battery pack output voltage is less than the preset load requirement voltage, the step-up / step-down power module is controlled to step up the voltage; If the predefined charging conditions are met, the step-up / step-down power module is controlled to step down the charging until the voltage of the battery pack meets the preset series charging termination conditions; wherein the series charging termination conditions include: when the series charging voltage reaches the preset series charging voltage value, the charging current is controlled to drop to zero, and the maximum voltage of each battery cell is not higher than the preset cell nominal voltage value; If the preset series charging end condition is met, the cell voltage value of each battery cell is obtained; Based on the voltage value of each monomer, control the monomer trickle charging module to execute the preset monomer supplementary charging process; The single-cell supplementary charging process includes: trickle charging the battery cells whose single-cell voltage value is lower than the preset single-cell charging voltage value; When the charging voltage of a battery cell reaches a preset single cell charging voltage value, the current is controlled to drop to zero, and the trickle charging is switched to the next battery cell until the charging voltage of all battery cells in the battery pack reaches the preset single cell charging voltage value and then stops.

8. The battery life extension application system according to claim 7, characterized in that: The controller is also configured to: Obtain and record the actual charging time of each battery cell; Based on the theoretical charging time of each battery cell obtained from the designated cloud, the factory capacity of the battery cell and the actual charging time, the capacity attenuation of each battery cell is estimated; If the capacity attenuation of a battery cell is lower than a preset threshold, a preset battery cell replacement prompt is output.

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