CN114335761A - Battery pack, battery pack power supply method and electric tool - Google Patents

Battery pack, battery pack power supply method and electric tool Download PDF

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Publication number
CN114335761A
CN114335761A CN202011077592.9A CN202011077592A CN114335761A CN 114335761 A CN114335761 A CN 114335761A CN 202011077592 A CN202011077592 A CN 202011077592A CN 114335761 A CN114335761 A CN 114335761A
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China
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electric core
electric
battery pack
core groups
current
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CN202011077592.9A
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Chinese (zh)
Inventor
杨德中
石平波
李靖
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Nanjing Chervon Industry Co Ltd
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Nanjing Chervon Industry Co Ltd
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Priority to CN202011077592.9A priority Critical patent/CN114335761A/en
Publication of CN114335761A publication Critical patent/CN114335761A/en
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Abstract

The embodiment of the invention discloses a battery pack, a battery pack power supply method and an electric tool. The battery pack includes: the battery pack comprises at least two parallel electric core groups, wherein a controllable switch is connected between one end of each electric core group and an electrode of the battery pack in series; the parameter acquisition module is respectively connected with the at least two electric core groups and is used for acquiring the operating parameters of the at least two electric core groups; the control module is respectively connected with the parameter acquisition module and each controllable switch, and the control module is used for: determining the operation state of the electric core groups based on the operation parameters of the electric core groups; according to the running state of the electric core groups, controlling the controllable switches to be alternately conducted according to a preset frequency so as to control the electric core groups to alternately output electric energy, or controlling the at least two controllable switches to be simultaneously conducted so as to control the at least two electric core groups to simultaneously output electric energy. The problem of among the prior art, the battery package after the upgrading appear burning out or can't start when mismatching the electric tool of old money is solved.

Description

Battery pack, battery pack power supply method and electric tool
Technical Field
The embodiment of the invention relates to the technology of electric tools, in particular to a battery pack, a battery pack power supply method and an electric tool.
Background
As the variety of electric tools increases, the output capability of the battery pack required by the electric tools is also increasing. It is necessary to increase the capacity of the battery pack, and a common upgrading method is to increase the number of the parallel-connected battery cells. However, pressure is brought to the old electric tool while the capacity of the battery is upgraded, the internal resistance is reduced after the battery cells are connected in parallel, the output capacity is increased, and the situation that the upgraded battery pack is burnt or cannot be started frequently occurs when the upgraded battery pack is matched with the old electric tool.
Disclosure of Invention
The embodiment of the invention provides a battery pack, a battery pack power supply method and an electric tool, which can improve the adaptability of the battery pack to different electric tools.
In a first aspect, an embodiment of the present invention provides a battery pack, including:
the battery pack comprises at least two parallel electric core groups, wherein a controllable switch is connected between one end of each electric core group and an electrode of the battery pack in series;
the parameter acquisition module is respectively connected with the at least two electric core groups and is used for acquiring the operating parameters of the at least two electric core groups;
the control module is respectively connected with the parameter acquisition module and each controllable switch, and is used for:
determining the operation state of the cell group based on the operation parameters of the cell groups;
and controlling the controllable switches to be alternately switched on according to a preset frequency according to the running state of the electric core groups so as to control the electric core groups to alternately output electric energy, or controlling at least two controllable switches to be simultaneously switched on so as to control at least two electric core groups to form a power supply unit to simultaneously output electric energy.
Optionally, the power supply further comprises at least one adjusting resistor, and the first ends of the adjacent electric core groups are connected in series through the adjusting resistor;
and the electric core group disconnected with the electrodes of the battery pack discharges to the rest electric core groups through the adjusting resistors so as to balance the electric energy among the electric core groups.
Optionally, the number of the controllable switches is greater than or equal to three; the control module is further configured to:
and controlling the controllable switches to conduct and switch according to the preset frequency so as to control the electric core groups to alternately form the power supply unit.
Optionally, the operating parameter is voltage or electric quantity; the control module is further configured to:
determining an initial voltage difference or an initial electric quantity difference between the electric core groups;
determining a current voltage difference between the respective electric core groups based on a current voltage of the respective electric core groups or determining a current electric quantity difference between the respective electric core groups based on a current electric quantity of the respective electric core groups;
and if the absolute value of the difference between the current voltage difference and the initial voltage difference is greater than a voltage threshold, or the absolute value of the difference between the current electric quantity difference and the initial electric quantity difference is greater than an electric quantity threshold, controlling the at least two controllable switches to be simultaneously conducted so as to control the at least two electric core groups to simultaneously output electric energy.
Optionally, the operating parameter is current or power; the control module is further configured to:
acquiring the current of each electric core group or the power of each electric core group, wherein the voltage is used for determining the power of each electric core group;
if the current of any one of the electric core groups is larger than the current threshold value or the power of any one of the electric core groups is larger than the power threshold value, controlling the at least two controllable switches to be simultaneously conducted so as to control the at least two electric core groups to simultaneously output electric energy.
Optionally, the controllable switches are switching tubes, and each switching tube is connected to the control module through a driving module;
the driving module comprises a first control end, a first pole and a second pole, the first control end is connected with the control module, the first pole is connected with a set voltage, and the second pole is grounded;
the switch tube comprises a second control end, a first end and a second end, the second control end is connected with the first pole of the driving module, the first end of the corresponding electric core group is connected with the first end, and the second end is connected with the corresponding output end of the power supply module.
Optionally, the driving module includes a triode, a first resistor, a second resistor, and a third resistor;
the base stage of the triode is connected with the first end of the first resistor, and the second end of the first resistor is used as the first control end of the driving module;
a collector of the triode is used as a first pole of the driving module, and the second resistor is connected in series between the collector and a first end corresponding to the electric core group so as to carry out current limiting through the second resistor;
and the emitter of the triode is used as the second pole of the driving module, the emitter of the triode is connected with the first end of the third resistor, and the second end of the third resistor is connected with the base of the triode.
Optionally, the cell units in each cell group are connected in series.
In a second aspect, an embodiment of the present invention further provides a battery pack power supply method, which is applied to the battery pack according to any embodiment of the present invention, where the method is executed by a control module, and the method includes:
determining the operation state of the cell group based on the operation parameters of the cell groups;
and controlling the controllable switches to be alternately switched on according to a preset frequency according to the running state of the electric core groups so as to control the electric core groups to alternately output electric energy, or controlling at least two controllable switches to be simultaneously switched on so as to control at least two electric core groups to form a power supply unit to simultaneously output electric energy.
Optionally, the operating parameter is voltage or electric quantity; the said running state according to the electric core group, control each said controllable switch switches on according to preset frequency in turn to control each electric core group to export electric energy in turn, or control at least two said controllable switch switches on simultaneously, in order to control at least two said electric core group exports electric energy simultaneously, include:
determining an initial voltage difference or an initial electric quantity difference between the electric core groups;
determining a current voltage difference between the respective electric core groups based on a current voltage of the respective electric core groups or determining a current electric quantity difference between the respective electric core groups based on a current electric quantity of the respective electric core groups;
if the absolute value of the difference between the current voltage difference and the initial voltage difference is greater than a voltage threshold, or the absolute value of the difference between the current electric quantity difference and the initial electric quantity difference is greater than an electric quantity threshold, controlling at least two controllable switches to be simultaneously conducted so as to control at least two electric core groups to simultaneously output electric energy;
if the absolute value of the difference between the current voltage difference and the initial voltage difference is smaller than or equal to a voltage threshold, or the absolute value of the difference between the current electric quantity difference and the initial electric quantity difference is smaller than or equal to an electric quantity threshold, controlling the controllable switches to be alternately conducted according to a preset frequency so as to control the electric core groups to alternately output electric energy; alternatively, the first and second electrodes may be,
the operating parameter is current or power; the said running state according to the electric core group, control each said controllable switch switches on according to preset frequency in turn to control each electric core group to export electric energy in turn, or control at least two said controllable switch switches on simultaneously, in order to control at least two said electric core group exports electric energy simultaneously, include:
acquiring the current of each electric core group or the power of each electric core group, wherein the voltage is used for determining the power of each electric core group;
if the current of any one of the electric core groups is greater than the current threshold value or the power of any one of the electric core groups is greater than the power threshold value, controlling at least two controllable switches to be simultaneously conducted so as to control at least two electric core groups to simultaneously output electric energy;
and if the current of all the electric core groups is less than or equal to the current threshold value or the power of all the electric core groups is less than or equal to the power threshold value, controlling the controllable switches to be alternately conducted according to a preset frequency so as to control all the electric core groups to alternately output electric energy.
In a third aspect, an embodiment of the present invention further provides an electric power tool including the battery pack according to any one of the embodiments of the present invention.
The battery package that this embodiment provided is through carrying out parallelly connected setting with a plurality of electric core groups to set up controllable switch in the parallelly connected branch road of each electric core group, by the break-make of control module control controllable switch, with the realization to correspond electric core group access power supply or disconnection power supply. The operation parameters of each electric core group are collected by the parameter collecting module, the control module determines the operation state of the electric core group based on the operation parameters of each electric core group, the operation state of the electric core group has a corresponding relation with the load condition, therefore, the control module can adjust the number of the electric core groups participating in power supply output based on the operation parameters of each electric core group, and the output capacity of the battery pack is dynamically adjusted. It should be noted that, at the initial stage of the battery pack being powered on, the control module controls each controllable switch to be alternately switched on according to a preset frequency, so that the power supply output is realized only by a single electric core group at the starting stage, thereby reducing the output current of the battery pack at the starting stage, avoiding the situation that the electric tool is burnt out or triggered to enter the overcurrent protection due to overcurrent, and ensuring the smooth starting of the electric tool. In the operation process of the electric tool, the control module dynamically adjusts the number of the electric core groups participating in power supply output based on the operation parameters of each electric core group so as to adapt to load change and improve the output capacity of the battery pack. The battery package that this embodiment provided has solved prior art, and the battery package after the upgrading appears burning or the problem that can't start when mismatching the electric tool of old money.
Drawings
Fig. 1 is a block diagram of a battery pack according to an embodiment of the present invention;
fig. 2 is a block diagram of another battery pack according to an embodiment of the present invention;
fig. 3 is a block diagram of another battery pack according to an embodiment of the present invention;
fig. 4 is a block diagram of another battery pack according to an embodiment of the present invention;
fig. 5 is a flowchart of a method for supplying power to a battery pack according to an embodiment of the present invention;
fig. 6 is a flowchart of another method for supplying power to a battery pack according to an embodiment of the present invention;
fig. 7 is a flowchart of another method for supplying power to a battery pack according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
In the prior art, capacity upgrading of a battery pack is realized by connecting electric cores in parallel, and the internal resistance of the battery pack is reduced by the parallel connection mode, so that the starting current is large, but the following problems exist: one situation is that if the power tool is not manufactured well, it may burn out the main machine at start-up; another situation is that a high current being activated can trigger over-current protection of the power tool, resulting in the power tool being unable to be activated.
The battery packs in the embodiment of the invention are firstly connected in series and then connected in parallel. Because two sets of electric cores switch in according to the equal frequency when starting, only have a set of electric core group power supply when being equivalent to the start, the electric core unit in this a set of electric core group is established ties, and its internal resistance does not diminish, just can not produce big starting current yet, therefore the condition that burn out or can not start can not appear. After the start-up, required electric current grow when the load sudden change increases, the power supply is connected in simultaneously to the two sets of electric core group of the back of control, because two sets of electric core groups are parallelly connected, and its internal resistance has reduced, can satisfy the heavy current demand of instrument. The above is the core idea of the present invention, and the scheme of the present invention is further explained with reference to the accompanying drawings.
Fig. 1 is a block diagram of a battery pack according to an embodiment of the present invention, where the battery pack is applicable to an electric tool to supply power to the electric tool. Referring to fig. 1, the battery pack includes:
at least two parallel electric core groups 10, wherein a controllable switch k is connected between one end of each electric core group 10 and an electrode of the battery pack in series;
the parameter acquisition module 20 is respectively connected with the at least two electric core groups 10, and the parameter acquisition module 20 is used for acquiring the operation parameters of the at least two electric core groups 10;
the control module 30 is connected to the parameter acquisition module 20 and each controllable switch k, and the control module 30 is configured to:
determining the operation state of the electric core groups 10 based on the operation parameters of the electric core groups 10;
according to the running state of the electric core groups 10, controlling the controllable switches k to be alternately conducted according to a preset frequency so as to control the electric core groups 10 to alternately output electric energy, or controlling at least two controllable switches k to be simultaneously conducted so as to control at least two electric core groups 10 to form a power supply unit to simultaneously output electric energy.
Wherein, a plurality of electric core group 10 that the parallelly connected setting is connected through the controllable switch k that connects with the electrode of battery package, and controllable switch k connection control module 30 to control module 30 is through the break-make of control controllable switch k, adjusts the quantity of the electric core group 10 of participating in the power supply in the battery package, realizes adjusting the electric energy output of battery package.
The parameter collecting module 20 collects the operation parameters of each cell group 10 in real time and outputs the operation parameters to the control module 30, so that the control module 30 determines the operation state of the cell group 10 according to the operation parameters of each cell group 10. The operation state of the electric core pack 10 is used to reflect the load state of the battery pack. For example, if the voltage parameter of the electric core group 10 determines that the voltage sudden change condition exists in the operation state of the electric core group 10, it indicates that the current load of the battery pack is large, and the power supply output needs to be increased.
In this embodiment, the cell units in each cell group 10 are connected in series, that is, the structure of the battery pack in the prior art is changed from a parallel-first structure to a parallel-first structure. The benefit that sets up like this lies in, when single electric core group 10 carries out the power consumption output, because the electric core unit in the electric core group 10 establishes ties, therefore the internal resistance of single electric core group 10 does not reduce, and single electric core group 10 just can not produce great start current like this to guarantee in the start-up stage, when being supplied power by single electric core group 10, can not appear big start current and damage electric tool or trigger the condition that electric tool got into start protection.
The control module 30 may be a battery Management system bms (battery Management system) of a battery pack. The control module 30 determines the operation state of the corresponding cell group 10 according to the operation parameters of each cell group 10, and then adjusts the number of the cell groups 10 participating in power supply output based on the operation state of the cell group 10. In some embodiments, the control module 30 divides the operation state of the electric core pack 10 into a plurality of operation levels, and the control module 30 first determines the current operation level of the electric core pack 10 based on the operation parameters of the electric core pack 10, and then switches on the corresponding number of electric core packs 10 to increase the power output of the battery pack to match the current load demand.
In this embodiment, when the battery pack is initially powered on, the control module 30 controls each controllable switch k to conduct and switch at equal frequency, so that the power is supplied to the load only by one electric core group 10 at the same time, at this time, the battery pack is equivalent to a single electric core group 10, and therefore, a large starting current cannot be generated, the situation that the electric tool is damaged by a large starting current or triggered to enter overcurrent protection can be avoided, and the normal starting of the adapted electric tool is ensured.
In the power supply process, if the adapted electric tool needs more supply current because of the load change, at this moment, the control module 30 can determine the load condition of the battery pack according to the operation parameters of the electric core group 10, and the control module 30 controls the plurality of controllable switches k to be simultaneously switched on based on the operation parameters so as to control the plurality of electric core groups 10 to simultaneously supply power to the load, thereby improving the output capacity of the battery pack and matching the increased load demand.
Exemplarily, the battery pack includes two electric core groups 10, and two electric core groups 10 are parallelly connected, and in the power supply process, if control module 30 judges that electric tool is currently in the heavy load state based on the operating parameter of two electric core groups 10, single electric core group 10 output electric energy can't satisfy the load demand, and at this moment, control module 30 controls two controllable switch k to switch on simultaneously for two electric core groups 10 supply power to the load simultaneously, thereby increased the power supply ability of battery pack, satisfied the load demand.
The battery pack provided by the embodiment is provided with a plurality of electric core groups 10 in parallel, a controllable switch k is arranged on a parallel branch of each electric core group 10, and the control module 30 controls the on-off of the controllable switch k so as to realize the connection or disconnection of the corresponding electric core group 10 for power supply. The operation parameters of each electric core group 10 are collected by the parameter collecting module 20, the control module 30 determines the operation state of the electric core group 10 based on the operation parameters of each electric core group 10, the operation state of the electric core group 10 corresponds to the load condition, and therefore the control module 30 can adjust the number of the electric core groups 10 participating in power supply output based on the operation parameters of each electric core group 10, and the output capacity of the battery pack is dynamically adjusted. It should be noted that, at the beginning stage of the power-on of the battery pack, the control module 30 controls each controllable switch k to be alternately turned on according to a preset frequency, so that the power supply output is realized only by a single electric core group 10 at the starting stage, thereby reducing the output current of the battery pack at the starting stage, avoiding the situation that the electric tool is burned or triggered to enter the overcurrent protection due to overcurrent, and ensuring the smooth start of the electric tool. During the operation of the electric tool, the control module 30 dynamically adjusts the number of the electric core groups 10 participating in power supply output based on the operation parameters of each electric core group 10 to adapt to load changes, thereby improving the output capacity of the battery pack. The battery package that this embodiment provided has solved prior art, and the battery package after the upgrading appears burning or the problem that can't start when mismatching the electric tool of old money.
Optionally, on the basis of the above technical scheme, the number of the controllable switches k is greater than or equal to three; the control module 30 is further configured to:
and controlling the controllable switches k to conduct and switch according to a preset frequency so as to control the electric core groups 10 to alternately form a power supply unit.
When the number of the controllable switches k is three or more, if there is a sudden change in the operation state of the electric core group 10, the control module 30 determines that the current load of the battery pack is increasing, and the control module 30 turns on the controllable switches k of the corresponding number to construct a corresponding power supply unit to supply power to the load. Under this operating mode, control module 30 also needs to switch the electric core group 10 that participates in the power supply output according to certain frequency to the electric energy state of each electric core group 10 of control regulation guarantees the battery package normal operating.
Illustratively, the number of the electric core groups 10 is three, which is the electric core group 101, the electric core group 102 and the electric core group 103, the control module 30 determines that the number of the electric core groups 10 that need to participate in the electric energy output is two, at this time, the control module 30 controls the controllable switch k to conduct and switch according to the preset frequency, for example, the electric core group 101 and the electric core group 102 are controlled to form a power supply unit for outputting the electric energy, after the preset time of power supply, the electric core group 102 and the electric core group 103 are controlled to form a power supply unit for outputting the electric energy, after the preset time is reached, the electric core group 101 and the electric core group 103 are controlled to form a power supply unit for outputting the electric energy, so as to conduct and switch, the electric energy balance of each electric core group 10 is realized, and the output capability of the battery pack is ensured to match with the current load condition.
Optionally, fig. 2 is a block diagram of another battery pack according to an embodiment of the present invention. On the basis of the above technical solution, refer to fig. 2. The battery pack also comprises at least one regulating resistor R0, and the first ends of the adjacent electric core groups 10 are connected in series through a regulating resistor R0;
the electric core pack 10 disconnected from the electrodes of the battery pack discharges electricity to the remaining electric core packs 10 through the regulating resistor R0 to perform the balance of the electric power among the electric core packs 10.
Each adjusting resistor R0 is connected in series between adjacent electric core groups 10, and the connection point of the adjusting resistor R0 and the electric core group 10 is located between the controllable switch k and the electric core group 10, so that the adjusting resistor R0 is arranged at the inner side of the controllable switch k. The advantage of this setting lies in, the electric core group 10 that does not participate in the power supply output charges to the electric core group 10 that is in the power supply state through corresponding adjusting resistance R0, makes the pressure differential between each electric core group 10 be close to zero, realizes the electric energy equilibrium between each electric core group 10.
Meanwhile, when all the cell packs 10 are required to participate in power supply output, all the controllable switches k are turned on, and at the moment, the regulating resistor R0 is bypassed, which is equivalent to an off state, so that the power supply output of the battery pack is not affected.
In this embodiment, by setting the adjusting resistor R0, when the electric core assembly 10 does not participate in power output, the electric core assembly 10 charges other electric core assemblies 10 through the adjusting resistor R0, so that the automatic balance among the electric core assemblies 10 can be realized, the condition of each electric core assembly 10 approaches, and obviously, the improvement of the service life and the output reliability of the battery pack is facilitated.
Optionally, on the basis of the above embodiment, reference is continued to fig. 2. The operation parameter is voltage or electric quantity; the control module 30 is further specifically configured to:
determining an initial voltage difference or an initial electric quantity difference between the electric core groups 10;
determining a current voltage difference between the respective electric core groups 10 based on the current voltage of the respective electric core groups 10 or determining a current electric quantity difference between the respective electric core groups 10 based on the current electric quantity of the respective electric core groups 10;
if the absolute value of the difference between the current voltage difference and the initial voltage difference is greater than the voltage threshold, or the absolute value of the difference between the current electric quantity difference and the initial electric quantity difference is greater than the electric quantity threshold, controlling the at least two controllable switches k to be simultaneously switched on so as to control the at least two electric core groups 10 to simultaneously output electric energy.
The current voltage difference and the current electric quantity difference are voltage differences and electric quantity differences among the electric core groups 10 detected in real time in the process that the battery pack is connected with a load to output power supply.
In this embodiment, the control module 30 may calculate the initial electric quantity and the current electric quantity of each electric core group 10 by the electric current of each electric core group 10 collected by the parameter collecting module 20, further determine the initial electric quantity difference between each electric core group 10 based on the initial electric quantity, and calculate the current electric quantity difference between each electric core group 10 based on the current electric quantity.
If the absolute value of the difference between the current voltage difference and the initial voltage difference is greater than the voltage threshold, or the absolute value of the difference between the current electric quantity difference and the initial electric quantity difference is greater than the electric quantity threshold, it indicates that the voltage state or the electric quantity state of the battery pack has a sudden change, and the output of the battery pack is adjusted based on the load state, so that the load of the battery pack at the moment is suddenly increased, and the power demand of the electric tool cannot be met only by outputting electric energy through the single electric core group 10. The control module 30 controls two or more electric core packs 10 to be simultaneously connected so that the two or more electric core packs 10 simultaneously supply power to the load to increase the output capacity of the battery pack.
In some embodiments, a plurality of voltage thresholds (or power thresholds) are preconfigured in the control module 30, the control module 30 compares the absolute value of the difference between the current voltage difference and the initial voltage difference with the plurality of voltage thresholds (or compares the absolute value of the difference between the current power difference and the initial power difference with the plurality of power thresholds) to determine a voltage difference level (or power difference level) corresponding to the absolute value of the difference, and turns on a corresponding number of controllable switches k to switch in a corresponding number of power core groups 10 based on the voltage difference level (or power difference level), so that the battery pack outputs power matched with the load, and the electric power tool operates normally.
Illustratively, the battery pack comprises two battery packs 10, and the two battery packs 10 are respectively connected with the electrodes of the battery pack through controllable switches K1 and K2. The control module 30 detects the total voltage of the two battery packs respectively, records the differential pressure Δ V1 of the two battery packs in the initial power-on state (the value is theoretically 0 in the initial state), and measures the differential pressure Δ V2 of the two battery packs in real time in the discharging process. When the absolute value of Δ V2- Δ V1 is smaller than the voltage threshold, the control module 30 controls the controllable switches K1 and K2 to perform equal frequency switching, and the discharge capacity of the whole battery pack is equivalent to that of one battery pack at this time; when the absolute value of Δ V2- Δ V1 is greater than the voltage threshold, the control module 30 determines that the single-cell discharge capability has not met the tool power requirements for this condition. The control module 30 controls the controllable switches K1, K2 to close simultaneously, at which time the battery pack discharge capacity is equivalent to two battery packs.
Optionally, on the basis of the above embodiment, reference is continued to fig. 2. The operating parameter is current or power; the control module 30 is further configured to:
acquiring the current of each electric core group 10 or the power of each electric core group 10;
if the current of any electric core group 10 is greater than the current threshold value or the power of any electric core group 10 is greater than the power threshold value, at least two controllable switches k are controlled to be simultaneously conducted so as to control at least two electric core groups 10 to simultaneously output electric energy.
Wherein, the power of the electric core assembly 10 is the output power of the electric core assembly 10. The control module 30 can calculate the power of each cell group 10 by the current and voltage of each cell group 10 output by the parameter collecting module 20.
When the electric core groups 10 are dynamically adjusted by the current/power of the electric core groups 10, the control module 30 directly compares the current/power of each electric core group 10 with a set current threshold/power threshold to detect whether there is an electric core group 10 exceeding the current threshold or the voltage threshold. When the current of any one of the electric core groups 10 exceeds the current threshold, or the power of any one of the electric core groups 10 exceeds the power threshold, it indicates that the output of the battery pack is passively increased, and the battery pack is output based on the load, so that the output is increased, which indicates that the load of the battery pack is increased, and the electric energy output by a single electric core group 10 cannot meet the current load requirement at this time, the control module 30 determines the load condition of the current battery pack according to the comparison result of the current of each electric core group 10 and the current threshold at this time, so as to conduct the corresponding number of controllable switches k, so that the corresponding number of electric core groups 10 simultaneously output the electric energy to simultaneously supply power to the load.
Optionally, a plurality of current thresholds or a plurality of power thresholds are preconfigured in the control module 30, and the control module 30 compares the current/power of each electric core pack 10 with the plurality of current thresholds/power thresholds to determine the current level/power level corresponding to the current/power, so as to turn on the corresponding number of controllable switches k, so as to control the corresponding number of electric core packs 10 to output electric energy at the same time.
Optionally, fig. 3 is a block diagram of another battery pack according to an embodiment of the present invention. On the basis of the above embodiment, reference is made to fig. 3. The controllable switches k are switching tubes Q, and each switching tube Q is connected with the control module 30 through a driving module 40;
the driving module 40 includes a first control end, a first pole and a second pole, the first control end is connected to the control module 30, the first pole is connected to the set voltage, and the second pole is grounded;
the switch tube Q includes a second control end, a first end and a second end, the second control end is connected to the first pole of the driving module 40, the first end is connected to the first end of the corresponding cell group 10, and the second end is connected to the corresponding output end of the power supply module.
The switching tube Q may be, for example, a MOS (Metal Oxide Semiconductor) Transistor or an IGBT (Insulated Gate Bipolar Transistor). The control module 30 is connected to the corresponding switching tube Q through the driving module 40 to drive the switching tube Q to be turned on or off.
Illustratively, when the control module 30 outputs a high level, the first control terminal of the driving module 40 is powered on, and at this time, the driving module 40 starts to operate, and the second control terminal of the switching tube Q is powered on, so that the switching tube Q is driven to conduct; when the control module 30 outputs a low level, the first control terminal of the driving module 40 loses power, at this time, the driving module 40 is turned off, and does not output a driving voltage, and the second control terminal of the switching tube Q is in an off state because there is no driving voltage. Thus, the control module 30 controls the on/off state of the switching tube Q through the driving module 40.
Optionally, fig. 4 is a block diagram of another battery pack according to an embodiment of the present invention. On the basis of the above embodiment, reference is made to fig. 4. The driving module 40 comprises a triode T, a first resistor R1, a second resistor R2 and a third resistor R3;
the base of the triode T is connected to the first end of the first resistor R1, and the second end of the first resistor R1 is used as the first control end of the driving module 40;
a collector of the transistor T is used as a first pole of the driving module 40, and the second resistor R2 is connected in series between the collector and a first end of the corresponding electric core group 10 to limit current through the second resistor R2;
the emitter of the transistor T serves as the second pole of the driving module 40, the emitter of the transistor T is connected to the first end of the third resistor R3, and the second end of the third resistor R3 is connected to the base of the transistor T.
When the control module 30 outputs a high level to the base stage of the transistor T, the current is limited by the first resistor R1, and then an adaptive current signal is output to the base stage of the transistor T, so that the transistor T is turned on, and the driving module 40 starts to operate.
The collector of the triode T is connected with the electric core set 10 through the second resistor R2, so that the electric core set 10 provides working current to the triode T after being limited by the second resistor R2. Meanwhile, because the second control end of the switch tube Q is connected with the collector of the triode T, when the triode T is turned on, the electric core group 10 outputs the matched driving voltage to the second control end of the switch tube Q after dividing the voltage by the second resistor R2, so as to drive the switch tube Q to be turned on.
The first end of the switch tube Q is connected to the electric core assembly 10 to provide the operating voltage to the switch tube Q through the electric core assembly 10.
Optionally, an embodiment of the present invention further provides a battery pack power supply method, and fig. 5 is a flowchart of the battery pack power supply method provided in the embodiment of the present invention. The battery pack power supply method is suitable for the condition that the power is supplied to the tool through the battery pack, in particular to the condition that the power tool with high starting current requirement is supplied through the battery pack. By the power supply method provided by the embodiment, the output capacity of the battery pack can be dynamically adjusted, and the load requirement is met. Referring to fig. 5, the battery pack power supply method includes the steps of:
and S510, determining the operation state of the cell groups based on the operation parameters of the cell groups.
The operation parameters of the electric core group can include voltage, current, electric quantity, output power and the like of the electric core group.
The control module determines the running state of the cell group by detecting the change condition of the running parameters of the cell group. And because the operation state of the electric core group is changed along with the load condition of the battery pack, the operation state of the electric core group represents the load condition of the battery pack.
Optionally, the control module can confirm a plurality of operation grades according to the operation parameter of electric core group, and control module switches on the electric core group of corresponding quantity based on the operation grade of electric core group, carries out electric energy output by the electric core group of corresponding quantity simultaneously to make the output capacity of battery package and the load looks adaptation of battery package.
For example, when the current passing through the electric core group suddenly increases, indicating that the output of the electric core group is increasing, the control module judges that the electric core group is being changed from a light load state to a heavy load state, so that the control module controls the two electric core groups to be simultaneously conducted to simultaneously output electric energy through the two electric core groups to adapt to the current heavy load state.
And S520, controlling the controllable switches to be alternately conducted according to a preset frequency according to the running state of the electric core groups so as to control the electric core groups to alternately output electric energy, or controlling at least two controllable switches to be simultaneously conducted so as to control at least two electric core groups to form a power supply unit to simultaneously output electric energy.
After the battery pack is powered on, the control module controls the electric core groups to be alternately conducted according to a preset frequency so as to control the electric core groups to alternately output electric energy, namely, only one electric core group outputs electric energy at the same time in a starting stage. Compared with the existing condition that a plurality of electric core groups are connected in series and output simultaneously, the electric core groups are only powered by a single electric core group in the starting stage, and obviously, large starting current can not occur. Meanwhile, according to the embodiment, the battery cell units in the single battery cell group are connected in series, so that the internal resistance of the single battery cell group is not reduced when the single battery cell group supplies power, and large starting current cannot be output when the single battery cell group supplies power and outputs power, so that the situation that the electric tool is burnt or enters starting protection due to the large starting current can be avoided.
In the power supply process, the control module passes through the operating parameter of each electric core group of parameter acquisition module output, judges the running state of each electric core group, if the running state that judges there is the electric core group appears the sudden change, control module judges the present load of battery package great from this to control a plurality of controllable switch and switch on simultaneously, carry out the electric energy output simultaneously through a plurality of electric core groups, guarantee electric load increase back electric tool's normal operating.
It should be noted that, in this embodiment, when the power supply unit composed of two or more electric core groups outputs electric energy, the control module further switches the electric core groups composing the power supply unit at equal frequency by switching the controllable switch, so as to realize electric energy equalization of each electric core group, control the voltage difference of each electric core group to keep close, and ensure normal and reliable operation of the battery pack.
According to the power supply method for the battery pack provided by the embodiment of the invention, in the starting stage of the adaptive electric tool, the controllable switching lights are controlled to be alternately conducted according to the set frequency, so that the electric core groups in the battery pack are controlled to alternately output electric energy, and only one electric core group outputs electric energy at the same time in the starting stage of the electric tool, so that even if the battery pack is applied to an old electric tool, the battery pack can avoid outputting large starting current in the starting stage of the electric tool, and the condition of machine burning or starting protection of the electric tool is avoided. Meanwhile, in the process of supplying power to the battery pack, the control module judges the running state of the cell pack through the running parameters of the cell pack, and controls the plurality of controllable switches to be simultaneously switched on when the running state of the cell pack is determined to accord with the preset condition, so that the power is supplied to the load through the plurality of cell packs simultaneously. Therefore, the problem that the battery pack is burnt and protected during starting of the electric tool in the prior art is solved, the power supply method for the battery pack provided by the embodiment is suitable for both the old electric tool requiring lower starting current and the new electric tool, and the applicability of the battery pack to different types of electric tools is improved.
Optionally, fig. 6 is a flowchart of another method for supplying power to a battery pack according to an embodiment of the present invention, where on the basis of the above embodiment, the method specifically includes the following steps:
and S610, determining an initial voltage difference or an initial electric quantity difference between the electric core groups.
The initial voltage difference refers to the voltage difference between the electric core groups in the initial power-on state. Similarly, the initial electric quantity difference refers to the electric quantity difference between the electric core groups in the initial power-on state.
The electric quantity in this embodiment can be calculated according to the electric current and the voltage of parameter acquisition module output and obtain, through obtaining the electric current and the voltage of initial power-on state promptly, calculate the initial electric quantity that obtains each electric core group, and then through two liang of comparisons, calculate the initial electric quantity difference between each electric core group.
And S620, determining the current voltage difference between the electric core groups based on the current voltage of the electric core groups or determining the current electric quantity difference between the electric core groups based on the current electric quantity of the electric core groups.
The current voltage difference refers to the voltage difference between the electric core groups determined by the control module in real time in the normal operation process after the electric tool is started. Similarly, the real-time electric quantity difference is the electric quantity difference between the electric core groups calculated by the control module in real time in the power supply process of the battery pack.
And the real-time electric quantity of each electric core group is calculated according to the real-time voltage and the real-time current of each electric core group.
And S630, if the absolute value of the difference between the current voltage difference and the initial voltage difference is greater than the voltage threshold, or the absolute value of the difference between the current electric quantity difference and the initial electric quantity difference is greater than the electric quantity threshold, controlling the at least two controllable switches to be simultaneously conducted so as to control the power supply unit consisting of the at least two electric core groups to simultaneously output electric energy.
If the difference value between the current voltage difference and the initial voltage difference exceeds the voltage threshold value, the difference value is larger when the current voltage of the electric core group is compared with the initial voltage during initial electrification, the output of the battery pack is adaptive to the load change of the battery pack, so that the load of the battery pack is suddenly increased at the moment, the voltage output by a single electric core group cannot meet the load requirement, and at the moment, the control module controls the electric core groups to simultaneously output electric energy and supply power to the load so as to meet the load requirement.
It should be noted that, when the number of the electric core sets is multiple (more than two), the number of the initial voltage differences and the current voltage differences is also multiple, that is, all the electric core sets need to be compared two by two to obtain all the comparison results. For example, when three electric-core groups, i.e., the first electric-core group, the second electric-core group and the third electric-core group, are connected in parallel in the battery pack, the control module needs to determine the voltage difference between the first electric-core group and the second electric-core group, the voltage difference between the first electric-core group and the third electric-core group, and the voltage difference between the second electric-core group and the third electric-core group, i.e., the control module needs to determine three sets of initial voltage differences and three sets of current voltage differences.
Similarly, the initial power difference and the real-time power difference also need to include all the cell groups. The output capacity of the battery pack is adjusted according to a similar method based on the difference between the current electric quantity difference and the actual electric quantity difference, which is not described in detail in this embodiment.
If the absolute value of the difference between the current voltage difference and the initial voltage difference does not exceed the voltage threshold or the absolute value of the difference between the current electric quantity difference and the initial electric quantity difference does not exceed the electric quantity threshold, the control module continues to control the controllable switches to be switched on and off according to the preset frequency so as to control the electric core groups to alternately output electric energy.
In the power supply method for the battery pack provided by this embodiment, the control module determines the initial voltage or the initial electric quantity of each electric core group according to the voltage parameter or the current parameter of each electric core group, so as to obtain the initial voltage difference or the initial electric quantity difference between each electric core group; in the power supply process of the battery pack, the current voltage or current electric quantity of each electric core group is determined in real time, and then the current voltage difference or current electric quantity difference between each electric core group is obtained; the control module further compares the current voltage difference of the corresponding electric core groups with the initial voltage difference, or compares the current electric quantity difference of the corresponding electric core groups with the initial electric quantity difference to detect whether voltage mutation or electric quantity mutation exists in each electric core group, the voltage mutation or electric quantity mutation reflects that great difference exists between the current state and the initial state of each electric core group, the load corresponding to the battery pack is suddenly increased, the control module controls the plurality of electric core groups to simultaneously output electric energy to increase the output capacity of the battery pack, and the output capacity of the battery pack is matched with the current load condition. If the situation that the voltage mutation or the electric quantity mutation does not exist in each electric core group is detected, the control module controls each electric core group to alternately supply power and output according to the preset frequency. Therefore, the purpose of dynamically adjusting the output capacity of the battery pack according to the running condition of the battery pack and meeting the load requirement is achieved.
Optionally, fig. 7 is a flowchart of another method for supplying power to a battery pack according to an embodiment of the present invention, where on the basis of the above embodiment, the method specifically includes the following steps:
and S710, acquiring the current of each electric core group or the power of each electric core group.
Wherein, the power of the electric core group is the output power of the electric core group, and can be calculated by the current and the voltage of the electric core group. And the control module calculates the output power of each electric core group according to the voltage and the current of each electric core group output by the parameter acquisition module.
S720, if the current of any electric core group is larger than the current threshold value or the power of any electric core group is larger than the power threshold value, controlling at least two controllable switches to be simultaneously conducted so as to control at least two electric core groups to form a power supply unit to simultaneously output electric energy.
If the current of any electric core group is larger than the current threshold or the power is larger than the power threshold, the battery pack is indicated to be passively output, and the output increase indicates that the load of the battery pack is increased, so that the control module controls the plurality of electric core groups to simultaneously supply power and output, and the output capacity of the battery pack is increased.
For example, when the number of the electric core groups is two, the two electric core groups are alternately supplied with power and output before the load is increased, so that in the working condition, the current of only one electric core group exceeds the current threshold value or the output power exceeds the power threshold value.
In the power supply method for the battery pack provided by this embodiment, the control module can calculate the output power of the electric core groups by the voltage and the current of each electric core group output by the parameter acquisition module, and the control module compares the voltage of each electric core group with the voltage threshold value, or comparing the output power of each electric core group with a power threshold value, when the voltage of any electric core group exceeds a voltage threshold value, or when the output power of any electric core group exceeds the power threshold value, the electric core group is indicated to increase the output passively, the output of the battery pack corresponds to the load, the passive increase of the output indicates that the load is increased, at the moment, the control module controls the controllable switches to be simultaneously conducted, the battery pack can be used for controlling the plurality of battery pack groups to output electric energy at the same time, so that the output capacity of the battery pack is increased to match the current load demand. Therefore, the output of the battery pack is dynamically adjusted based on the current or power of each battery pack, the battery pack can mismatch electric tools with different requirements, and the applicability of the battery pack is improved.
Optionally, the embodiment of the invention also provides an electric tool, which is not limited to electric drills, grinders, screwdrivers, sanding machines and the like. The electric tool comprises the battery pack according to any of the above embodiments, so that the present embodiment also has the advantages described in any of the above embodiments.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims (10)

1. A battery pack, comprising:
the battery pack comprises at least two parallel electric core groups, wherein a controllable switch is connected between one end of each electric core group and an electrode of the battery pack in series;
the parameter acquisition module is respectively connected with the at least two electric core groups and is used for acquiring the operating parameters of the at least two electric core groups;
the control module is respectively connected with the parameter acquisition module and each controllable switch, and is used for:
determining the operation state of the cell group based on the operation parameters of the cell groups;
and controlling the controllable switches to be alternately switched on according to a preset frequency according to the running state of the electric core groups so as to control the electric core groups to alternately output electric energy, or controlling at least two controllable switches to be simultaneously switched on so as to control at least two electric core groups to form a power supply unit to simultaneously output electric energy.
2. The battery pack according to claim 1, further comprising at least one regulating resistor, wherein the first ends of the adjacent electric core groups are connected in series by the regulating resistor; wherein the content of the first and second substances,
and the electric core group disconnected with the electrodes of the battery pack discharges to the rest electric core groups through the adjusting resistors so as to balance the electric energy among the electric core groups.
3. The battery pack of claim 1, wherein the number of controllable switches is greater than or equal to three; the control module is further configured to:
and controlling the controllable switches to conduct and switch according to the preset frequency so as to control the electric core groups to alternately form the power supply unit.
4. A battery pack according to any one of claims 1 to 3, wherein the operating parameter is voltage or charge; the control module is further configured to:
determining an initial voltage difference or an initial electric quantity difference between the electric core groups;
determining a current voltage difference between the respective electric core groups based on a current voltage of the respective electric core groups or determining a current electric quantity difference between the respective electric core groups based on a current electric quantity of the respective electric core groups;
and if the absolute value of the difference between the current voltage difference and the initial voltage difference is greater than a voltage threshold, or the absolute value of the difference between the current electric quantity difference and the initial electric quantity difference is greater than an electric quantity threshold, controlling the at least two controllable switches to be simultaneously conducted so as to control the at least two electric core groups to simultaneously output electric energy.
5. A battery pack, as recited in any of claims 1-3, wherein the operating parameter is current or power; the control module is further configured to:
acquiring the current of each electric core group or the power of each electric core group;
if the current of any one of the electric core groups is larger than the current threshold value or the power of any one of the electric core groups is larger than the power threshold value, controlling the at least two controllable switches to be simultaneously conducted so as to control the at least two electric core groups to simultaneously output electric energy.
6. The battery pack of claim 1, wherein the controllable switches are switching tubes, and each switching tube is connected to the control module through a driving module;
the driving module comprises a first control end, a first pole and a second pole, the first control end is connected with the control module, the first pole is connected with a set voltage, and the second pole is grounded;
the switch tube comprises a second control end, a first end and a second end, the second control end is connected with the first pole of the driving module, the first end of the corresponding electric core group is connected with the first end, and the second end is connected with the corresponding output end of the power supply module.
7. The battery pack of claim 6, wherein the driving module comprises a transistor, a first resistor, a second resistor, and a third resistor;
the base stage of the triode is connected with the first end of the first resistor, and the second end of the first resistor is used as the first control end of the driving module;
a collector of the triode is used as a first pole of the driving module, and the second resistor is connected in series between the collector and a first end corresponding to the electric core group so as to carry out current limiting through the second resistor;
and the emitter of the triode is used as the second pole of the driving module, the emitter of the triode is connected with the first end of the third resistor, and the second end of the third resistor is connected with the base of the triode.
8. The battery pack according to any one of claims 1 to 3 or 6 to 7, wherein the cell units in each of the cell groups are connected in series.
9. A method for supplying power to a battery pack, applied to the battery pack according to any one of claims 1 to 8, wherein the method is executed by a control module, and the method comprises:
determining the operation state of the cell group based on the operation parameters of the cell groups;
and controlling the controllable switches to be alternately switched on according to a preset frequency according to the running state of the electric core groups so as to control the electric core groups to alternately output electric energy, or controlling at least two controllable switches to be simultaneously switched on so as to control at least two electric core groups to form a power supply unit to simultaneously output electric energy.
10. An electric power tool comprising the battery pack according to any one of claims 1 to 8.
CN202011077592.9A 2020-10-10 2020-10-10 Battery pack, battery pack power supply method and electric tool Pending CN114335761A (en)

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TW427100B (en) * 1997-11-12 2001-03-21 Hubbell Inc Multi-voltage ballast and dimming circuits for a lamp driven voltage transformation and ballasting system
CN103123991A (en) * 2011-11-18 2013-05-29 德龙伟创科技(深圳)有限公司 Lithium-based batteries connected in parallel by modules
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CN208730821U (en) * 2018-08-17 2019-04-12 深圳市铭隆动力科技有限公司 A kind of Multifunctional battery dynamical system
CN109995096A (en) * 2017-12-29 2019-07-09 苏州宝时得电动工具有限公司 More packets are in parallel mutually to fill control circuit, control method and electric tool
CN111106648A (en) * 2019-12-27 2020-05-05 北京兴达智联科技有限公司 System and method for parallel discharge operation of multiple battery packs

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW427100B (en) * 1997-11-12 2001-03-21 Hubbell Inc Multi-voltage ballast and dimming circuits for a lamp driven voltage transformation and ballasting system
CN103123991A (en) * 2011-11-18 2013-05-29 德龙伟创科技(深圳)有限公司 Lithium-based batteries connected in parallel by modules
CN105529771A (en) * 2016-01-04 2016-04-27 深圳天邦达科技有限公司 Lithium battery protection system for electric tool
CN109995096A (en) * 2017-12-29 2019-07-09 苏州宝时得电动工具有限公司 More packets are in parallel mutually to fill control circuit, control method and electric tool
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