CN114336805A - Battery pack charging device and charging method - Google Patents
Battery pack charging device and charging method Download PDFInfo
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- CN114336805A CN114336805A CN202011062507.1A CN202011062507A CN114336805A CN 114336805 A CN114336805 A CN 114336805A CN 202011062507 A CN202011062507 A CN 202011062507A CN 114336805 A CN114336805 A CN 114336805A
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Abstract
The application discloses a battery pack charging device and a charging method, comprising a battery management system, a charging module and a charging module, wherein the battery management system is used for detecting the state of each battery unit in a battery pack; the charging device has a voltage charging operation mode and a current charging operation mode, and the charging device is selectively in the current charging operation mode according to the state of each battery unit and is used for charging the battery pack through the first charging branch circuit, or in the voltage charging operation mode and is used for charging each battery unit through the second charging branch circuit in a one-to-one manner. According to the technical scheme provided by the embodiment of the application, the charging equipment can charge the battery pack through two charging modes, the current charging working mode or the voltage charging working mode charges the battery pack, one-to-one charging can be carried out on each battery unit in the battery pack under the voltage charging working mode, and the battery units in the battery pack can be ensured to be in a full-charge state.
Description
Technical Field
The present invention relates generally to the field of battery technology, and more particularly to a battery pack charging apparatus and method.
Background
In a battery pack obtained by connecting a plurality of battery units in series (each battery unit may be formed by connecting a single battery with a large capacity or a plurality of single batteries with a small capacity in parallel), the equilibrium state and the consistent state of the performance of each battery unit are of great significance to the normal operation of the whole battery pack. The voltage of any battery unit deviates from the average state of other units in the battery pack too much, or the difference between the main performance state such as the chargeable capacity of any battery unit and the average state of other units in the battery pack is too much, which also leads to the obvious reduction of the chargeable and dischargeable capacity of the battery pack.
In order to avoid the occurrence of a fault that the charge and discharge amount of the battery is reduced, a technical scheme adopted generally is to perform equalization processing on a battery unit with a larger difference between the electric state and other battery units, for example, a discharge circuit is used for consuming electric energy in a battery unit with a larger electric quantity; timely identification is also needed for abnormal situations where the performance state of the battery cells differs too much from the average state in the battery pack.
However, the existing identification schemes usually require the evaluation of the lighting of each battery cell and the precise control of the equalizing current thereof, so that more complicated current regulation and distribution circuits are required, resulting in high overall cost of the system for implementing the method, and the circuit complexity causes the reliability to be reduced.
Disclosure of Invention
In view of the above-mentioned drawbacks and deficiencies of the prior art, it is desirable to provide a battery pack charging device and a charging method.
In a first aspect, there is provided a battery pack charging apparatus comprising:
a battery management system for detecting a state of each battery cell in a battery pack, the state including at least a voltage of each battery cell;
the charging device comprises a first charging branch and a second charging branch;
the charging device has a voltage charging operation mode and a current charging operation mode, and the charging device is selectively used for charging the battery pack through the first charging branch in the current charging operation mode according to the voltage of each battery unit, or used for charging each battery unit through the second charging branch in a one-to-one mode in the voltage charging operation mode;
the second charging branch is provided with a DC-AC conversion module and a plurality of AC-DC conversion modules, the input end of the DC-AC conversion module is connected to the charging equipment, the output end of the DC-AC conversion module is connected in parallel with a plurality of first induction coils, each first induction coil is coupled with a second induction coil in a one-to-one correspondence manner, each second induction coil is connected with the input end of each AC-DC conversion module in a one-to-one correspondence manner, and the output end of each AC-DC conversion module is connected with each battery unit in a one-to-one correspondence manner.
Further, the DC-AC conversion module is further configured to detect an output voltage of the charging device, and when the output voltage reaches a first voltage threshold, the DC-AC conversion module is configured to provide power to each of the first induction coils.
Further, the AC-DC conversion module is also used for detecting the output voltage of the second induction coil and the voltage of the battery unit connected with the second induction coil,
when the output voltage of the second induction coil reaches a second voltage threshold value, the AC-DC conversion module charges a battery unit connected with the AC-DC conversion module,
when the voltage of the battery unit reaches a charge cut-off voltage, the AC-DC conversion module stops operating for a first set time.
Furthermore, a switch element is arranged on the first charging branch, and the contactor is used for being closed when the charging equipment is in a current charging working mode and being disconnected when the charging equipment is in a voltage charging working mode.
Further, the battery management system is further configured to detect a voltage of each battery cell in the battery pack when the charging device is in a current charging operating mode, and control the charging device to switch from the current charging operating mode to the voltage charging operating mode when any one of the detected voltages reaches a charging cut-off voltage.
Furthermore, the battery management system is further configured to detect a voltage of each battery cell in the battery pack when the charging device is in a voltage charging operating mode, and control the charging device, the DC-AC conversion module, and the AC-DC conversion module to stop operating when any one of the detected voltages reaches an alarm voltage.
Further, the battery management system is further configured to detect a voltage of each battery cell in the battery pack when the charging device is in a voltage charging operation mode, and control the charging device, the DC-AC conversion module, and the AC-DC conversion module to stop operating when all detected voltages reach a charging cutoff voltage.
Further, the battery management system is further configured to detect whether a voltage charging operation mode exists in the last charging after the charging module outputs the current, and detect the remaining capacity of the battery pack;
if the process of equalizing charging does not exist in the last charging, the battery management system controls the charging module to continue charging;
if the voltage charging working mode process exists in the last charging and the residual electric quantity of the battery pack is in the set range, the battery management system controls the charging module to continue charging;
and if the process of the voltage charging working mode existing in the last charging is judged and the residual electric quantity of the battery pack is not in the set range, the battery management system controls the output current of the charging module to be 0 and detects the open-circuit voltage of each battery unit in the battery pack after a second set time.
Further, the battery management system is also used for judging whether the open-circuit voltage of each battery unit is in a preset average voltage range,
if yes, the battery management system controls the charging unit to continue charging in a current charging working mode;
otherwise, the battery management system gives an alarm and controls the charging unit to continue charging in a current charging working mode.
In a second aspect, a battery pack charging method is provided, and the battery pack charging device is used for charging.
According to the technical scheme provided by the embodiment of the application, the charging equipment can charge the battery pack through two charging modes, a current charging working mode or a voltage charging working mode charges the battery pack, and one-to-one charging can be carried out on each battery unit in the battery pack in the voltage charging working mode, so that the battery units in the battery pack can be in a full-charge state; meanwhile, each battery unit is controlled by the independent AC-DC conversion module, so that on one hand, each battery unit can be respectively charged one by one in a voltage charging working mode, and on the other hand, the independently controlled AC-DC conversion module can avoid the occurrence of a battery overcharge fault caused by voltage detection failure of one battery unit.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
fig. 1 is a schematic structural diagram of a battery pack charging apparatus according to the present embodiment;
fig. 2 is a charging mode of the battery charging apparatus according to the present embodiment;
FIG. 3 is a schematic view of another charging mode of the general battery charging apparatus according to the present embodiment;
FIG. 4 is a flowchart illustrating a method for charging a battery pack according to the present embodiment;
FIG. 5 is a flowchart illustrating the equalizing charge of the battery pack according to the present embodiment;
fig. 6 is a flow chart of battery pack detection before charging in the present embodiment.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
Referring to fig. 1, the present embodiment provides a battery pack charging apparatus, including:
a battery management system 8, the battery management system 8 being configured to detect a state of each battery cell 1 in the battery pack, the state including at least a voltage of each battery cell;
the charging device 2 comprises a first charging branch and a second charging branch;
the charging device 2 has a voltage charging operation mode and a current charging operation mode, and the charging device 2 is selectively used for charging the battery pack through the first charging branch in the current charging operation mode or charging each battery unit through the second charging branch in a one-to-one manner in the voltage charging operation mode according to the voltage of each battery unit 1;
the second charging branch is provided with a DC-AC conversion module 3 and a plurality of AC-DC conversion modules 4, the input end of the DC-AC conversion module 3 is connected to the charging device 2, the output end of the DC-AC conversion module is connected in parallel with a plurality of first induction coils 6, the first induction coils 6 are coupled with second induction coils 5 in a one-to-one correspondence manner, the second induction coils 5 are connected with the input end of each AC-DC conversion module 4 in a one-to-one correspondence manner, and the output end of each AC-DC conversion module 4 is connected with each battery unit 1 in a one-to-one correspondence manner.
In this embodiment, the charging device can charge the battery pack through two charging modes, wherein the battery pack is charged through a current charging working mode or a voltage charging working mode, and each battery unit in the battery pack can be guaranteed to be charged one-to-one in the voltage charging working mode, so that the battery units in the battery pack can be guaranteed to be in a fully charged state; meanwhile, each battery unit is controlled by the independent AC-DC conversion module, so that on one hand, each battery unit can be respectively charged one by one in a voltage charging working mode, and on the other hand, the independently controlled AC-DC conversion module can avoid the occurrence of a battery overcharge fault caused by voltage detection failure of one battery unit.
Fig. 1 is a schematic diagram of the battery pack charging apparatus, where a battery pack includes N battery cells connected in series, where N is an integer greater than 1, and a battery management system detects a state of each battery cell in the battery pack, including detecting a voltage, a temperature, a current, and the like of the battery cell, and performs control such as changing a charging mode of a charging device and stopping the entire apparatus according to the state of the battery cell, and specifically determines the state by the voltage of each battery cell; the charging device in the embodiment comprises two charging modes, namely a current charging working mode and a voltage charging working mode, the whole battery pack, namely the battery units connected in series, is directly charged in the current charging working mode, one-to-one charging is carried out on the current units through the voltage conversion module in the voltage charging working mode, each current unit can be charged to a cut-off voltage, each current unit in the battery pack can be fully charged, the voltage charging working mode is called equalizing charging, and the equalizing charging refers to the charging of each battery unit in the battery pack; the battery pack charging device in this embodiment includes two charging branches, as shown in fig. 2, which is a structural diagram of charging through a first charging branch, and when the battery pack is charged through the first charging branch, the battery pack is in a current charging mode, and the charging device directly charges the battery pack;
in this embodiment, the second charging branch is provided with an electrical DC-AC conversion module and a plurality of AC-DC conversion modules, and the voltages output by the charging unit are converted and then charged into the battery units, where the number of the AC-DC conversion modules is the same as that of the battery units, and each battery unit is connected with one AC-DC conversion module, and the battery units can be individually controlled by the AC-DC conversion modules, so that each battery unit can be fully charged when charged, and meanwhile, the occurrence of a battery overcharge fault due to voltage detection failure of the AC-DC conversion module that charges the battery units individually can be avoided. As shown in fig. 3, the structure diagram of charging through the second charging branch is a voltage charging mode when the battery pack is charged through the second charging branch, and in the voltage charging mode, the DC-AC conversion module obtains power from the DC power output terminal of the charging device; and each battery unit is provided with a unique AC-DC conversion module corresponding to the unique AC-DC conversion module.
Further, the DC-AC conversion module 3 is further configured to detect an output voltage of the charging device 2, and when the output voltage reaches a first voltage threshold, the DC-AC conversion module 3 is configured to provide power to each of the first induction coils 6.
In this embodiment, the second branch charges each battery unit through a voltage charging mode, and requires the charging device to charge the DC-AC conversion module in a voltage control mode according to the working voltage required by the DC-AC conversion module, and when the DC-AC conversion module detects that the input voltage reaches the first voltage threshold for starting, the module automatically starts to operate.
Further, the AC-DC conversion module 4 is also used for detecting the output voltage of the second induction coil 5 and the voltage of the battery unit 1 connected with the second induction coil,
when the output voltage of the second induction coil 5 reaches a second voltage threshold, the AC-DC conversion module 4 charges the battery cell connected thereto,
when the voltage of the battery unit reaches a charge cut-off voltage, the AC-DC conversion module stops operating for a first set time.
In the voltage charging working mode, when the AC-DC conversion module detects that the input voltage reaches a set second voltage threshold value of starting, the module automatically starts to operate, detects the voltage of the battery units connected with the module, and when the voltage of one battery unit reaches a charging cut-off voltage, the voltage of the current battery unit is fully charged, the AC-DC conversion module connected with the battery unit stops operating and is not started within a first set time.
Further, a switch element 7 is arranged on the first charging branch, and the switch element 7 is configured to be closed when the charging device 2 is in the current charging operating mode and to be opened when the charging device is in the voltage charging operating mode.
As shown in fig. 1, in this embodiment, a switching element is disposed between the battery pack and the charging device, and the switching element is closed when the charging device performs the charging operation in the current charging operation mode, and is preferably a contactor, and when the charging device switches the operation mode to the voltage charging operation mode, the switching element is opened, and the charging device charges the battery pack by going through the second branch.
Further, the battery management system is further configured to detect a voltage of each battery cell in the battery pack when the charging device is in the current charging operating mode, and control the charging device to switch from the current charging operating mode to the voltage charging operating mode when any one of the detected voltages reaches a charging cut-off voltage.
In this embodiment, the battery management system performs real-time detection on the voltage of each battery unit, as shown in fig. 4, when charging is started, the charging device charges the battery units in a current charging operation mode, and when it is detected that any one of the detected voltages reaches a charging cut-off voltage, the charging device is required to suspend power supply, the contactor is turned off, and the charging device is switched to a voltage charging operation mode for charging, where the voltage charging operation mode is an equalizing charging mode, so as to ensure that each battery unit in the battery pack can be charged to the cut-off voltage.
Furthermore, the battery management system is further configured to detect a voltage of each battery cell in the battery pack when the charging device is in a voltage charging operating mode, and control the charging device, the DC-AC conversion module, and the AC-DC conversion module to stop operating when any one of the detected voltages reaches an alarm voltage.
When the battery management system enters a voltage charging working mode, the battery management system detects the voltage of the battery units in real time, when the detection of any battery unit reaches the alarm voltage, the charging equipment needs to be stopped to charge, and at the moment, the charging is finished.
Further, the battery management system is further configured to detect a voltage of each battery cell in the battery pack when the charging device is in a voltage charging operation mode, and control the charging device, the DC-AC conversion module, and the AC-DC conversion module to stop operating when all detected voltages reach a charging cutoff voltage.
In this embodiment, each battery power supply is charged through a voltage charging mode, so that it is ensured that each battery unit can be fully charged to a charging cut-off voltage, and when the voltages of all the battery units reach the charging cut-off voltage, the charging is completed, and the charging device stops outputting.
Further, the battery management system is further configured to detect whether a voltage charging operation mode exists in the last charging after the charging module outputs the current, and detect the remaining capacity of the battery pack;
if the last charging is judged to have no voltage charging working mode process, the battery management system controls the charging module to continue charging;
if the voltage charging working mode process exists in the last charging and the residual electric quantity of the battery pack is in the set range, the battery management system controls the charging module to continue charging;
and if the process of the voltage charging working mode existing in the last charging is judged and the residual electric quantity of the battery pack is not in the set range, the battery management system controls the output current of the charging module to be 0 and detects the open-circuit voltage of each battery unit in the battery pack after a second set time.
In this embodiment, the purpose of charging each battery cell in the battery pack in the voltage charging mode is to ensure that each battery cell can be fully charged, and after the equalizing charging process is completed, the stable voltage states of the battery cells should be theoretically equal to each other, so that the consistency of the voltage of the battery cells can be further determined by using the consistency state determination process of the battery cells, and an effective reference basis is provided for maintaining the battery pack in time. Specifically, after each charging is started, a series of detections are performed, and the battery management system judges whether a voltage charging working mode exists in the last charging process and detects the residual electric quantity of the battery pack;
if the last charging has no voltage charging working mode, namely equalizing charging is not carried out, directly entering a charging process;
if the battery pack is subjected to equalizing charge, further judgment is needed according to the residual capacity of the battery pack, the residual capacity of the battery pack and the open-circuit voltage of the battery pack are in a certain relation, the relation curve has a stable curve, for example, the residual capacity is 60% -90%, and when the residual capacity is not in the stable curve, the battery pack is directly charged; if the remaining capacity is within the stable curve and the remaining capacity is 60% -90%, the battery pack needs to be stopped to be charged for a period of time, the open-circuit voltage is measured after a period of time, and the measured open-circuit voltage is judged so as to determine the consistency of each battery unit.
Further, the battery management system is also used for judging whether the open-circuit voltage of each battery unit is in a preset average voltage range,
if yes, the battery management system controls the charging unit to continue charging in a current charging working mode;
otherwise, the battery management system gives an alarm and controls the charging unit to continue charging in a current charging working mode.
Specifically, when the measured change value of the open-circuit voltage is within a predetermined average voltage range, that is, the change value of the voltage is in accordance with an expectation, it is determined that the consistency of the battery cells in the battery pack is good, the charging is continued, and when the measured open-circuit voltage exceeds the average voltage range, it is determined that the consistency of the battery cells is poor, an alarm needs to be given first, and then the normal charging is performed.
The embodiment also provides a battery pack charging method, and the battery pack charging device is used for charging.
The battery pack charging method includes: the charging equipment charges the battery pack in a current charging working mode;
and detecting the voltage of each battery unit in the battery pack, and if any one detected voltage reaches a charging cut-off voltage, controlling the charging equipment to be switched from the current charging working mode to the voltage charging working mode by the battery management system.
In this embodiment, the above battery pack charging apparatus is used for charging, as shown in fig. 4, which is a charging flowchart, first, a switching element, that is, a contactor is closed, a charging device charges in a current output operating mode, and a battery management system detects voltages of battery cells in a battery pack, when a voltage of one battery cell reaches a charging cut-off voltage, the charging device suspends power supply to switch the operating mode, the contactor is disconnected, the charging device switches to the voltage output operating mode to charge, and after charging is completed, charging is ended.
Further, the method comprises the following steps:
when the charging device charges the battery pack in the voltage charging mode of operation,
the DC-AC conversion module detects the output voltage of the charging equipment, and if the output voltage reaches a first voltage threshold value, the DC-AC conversion module provides electric energy for the first induction coil;
the AC-DC conversion module detects the output voltage of the second induction coil and the voltage of the battery unit connected with the second induction coil, if the output voltage reaches a second voltage threshold value, the AC-DC conversion module charges the battery unit, and if the voltage of the battery unit reaches a charging cut-off voltage, the AC-DC conversion module stops running for a first set time.
Further, the method comprises the following steps: detecting a voltage of each battery cell in the battery pack;
if any one detection voltage reaches an alarm voltage, the battery management system controls the charging equipment, the DC-AC conversion module and the AC-DC conversion module to stop working;
and if all the detected voltages reach the charging cut-off voltage, the battery management system controls the charging equipment, the DC-AC conversion module and the AC-DC conversion module to stop working.
Fig. 5 shows a process diagram of equalizing charging, that is, charging equipment performs charging in a voltage output operation mode, after charging starts, the charging equipment charges the battery pack in the voltage output operation mode, at this time, both the AC-DC conversion module and the DC-AC conversion module start to charge, when the voltage of any one battery unit reaches a charging cut-off voltage, the AC-DC conversion module connected to the current battery unit stops operating and is not started any more within a period of time, when the voltage of any one battery unit reaches an alarm voltage, charging is controlled to be finished, otherwise, the voltage of each battery unit is waited to be charged to the charging cut-off voltage, all battery units are fully charged, and charging is finished at this time.
Further, the method comprises the following steps: after the charging module outputs current, the battery management system detects whether a voltage charging working mode exists in the last charging and detects the residual electric quantity of the battery pack;
if the process of the voltage charging working mode does not exist in the last charging, the battery management system controls the charging module to continue charging;
if the voltage charging working mode process exists in the last charging and the residual electric quantity of the battery pack is in the set range, the battery management system controls the charging module to continue charging;
and if the process of the voltage charging working mode existing in the last charging is judged and the residual electric quantity of the battery pack is not in the set range, the battery management system controls the output current of the charging module to be 0 and detects the open-circuit voltage of each battery unit in the battery pack after a second set time.
Further, the method also comprises the following steps:
the battery management system is further configured to determine whether the open circuit voltage of each cell is within a predetermined average voltage range,
if yes, the battery management system controls the charging unit to continue charging in a current charging working mode;
otherwise, the battery management system gives an alarm and controls the charging unit to continue charging in a current charging working mode.
Fig. 6 shows that after charging, consistency of each battery unit in the battery pack is detected, the battery management system detects whether there is an equalizing charge process in the last charging, if not, the battery management system directly enters a charging process, if there is an equalizing charge process, the battery pack remaining capacity is further detected, if the detected remaining capacity is within a set range, a specific range has been described in the above embodiments, and no further description is given herein, the battery management system directly enters the charging process, if the detected remaining capacity is not within the set range, charging current of the charging device needs to be adjusted to 0, after a period of time, open-circuit voltage Ui of the battery unit is detected, whether a variation range of Ui is within a predetermined average voltage range is determined, if yes, the charging process is entered, it is described that consistency of the battery units in the battery pack is not affected, if not, consistency of the battery units in the battery pack is determined to be poor, an alarm is required first, and then a charging process is started.
The charging equipment can charge the battery pack through two charging modes, a current charging working mode or a voltage charging working mode charges the battery pack, and each battery unit in the battery pack can be charged one by one in the voltage charging working mode, so that the battery units in the battery pack can be in a full-charge state; meanwhile, each battery unit is controlled by the independent AC-DC conversion module, so that on one hand, each battery unit can be respectively charged one by one in a voltage charging working mode, and on the other hand, the independently controlled AC-DC conversion module can avoid the occurrence of a battery overcharge fault caused by voltage detection failure of one battery unit. After the equalizing charge is completed, the stable voltage states of the battery units should be equal to each other in theory, so the battery units with poor voltage consistency can be distinguished by adopting the battery unit consistency state judgment sub-process, and an effective reference basis is provided for timely maintaining the battery pack.
The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.
Claims (14)
1. A battery pack charging apparatus, comprising:
a battery management system for detecting a state of each battery cell in a battery pack, the state including at least a voltage of each battery cell;
the charging device comprises a first charging branch and a second charging branch;
the charging device has a voltage charging operation mode and a current charging operation mode, and the charging device is selectively used for charging the battery pack through the first charging branch in the current charging operation mode according to the voltage of each battery unit, or used for charging each battery unit through the second charging branch in a one-to-one mode in the voltage charging operation mode;
the second charging branch is provided with a DC-AC conversion module and a plurality of AC-DC conversion modules, the input end of the DC-AC conversion module is connected to the charging equipment, the output end of the DC-AC conversion module is connected in parallel with a plurality of first induction coils, each first induction coil is coupled with a second induction coil in a one-to-one correspondence manner, each second induction coil is connected with the input end of each AC-DC conversion module in a one-to-one correspondence manner, and the output end of each AC-DC conversion module is connected with each battery unit in a one-to-one correspondence manner.
2. The battery pack charging apparatus of claim 1, wherein the DC-AC conversion module is further configured to detect an output voltage of the charging device, and the DC-AC conversion module is configured to provide power to each of the first induction coils when the output voltage reaches a first voltage threshold.
3. The battery pack charging apparatus according to claim 2, wherein the AC-DC conversion module is further configured to detect an output voltage of the second induction coil and a voltage of a battery cell connected thereto,
when the output voltage of the second induction coil reaches a second voltage threshold value, the AC-DC conversion module charges a battery unit connected with the AC-DC conversion module,
when the voltage of the battery unit reaches a charge cut-off voltage, the AC-DC conversion module stops operating for a first set time.
4. A battery charging apparatus according to any of claims 1 to 3, wherein the first charging branch is provided with a switching element, the switching element being adapted to be closed when the charging device is in a current charging mode of operation and to be open when the charging device is in a voltage charging mode of operation.
5. The battery pack charging apparatus according to any one of claims 1 to 3, wherein the battery management system is further configured to detect a voltage of each battery cell in the battery pack when the charging device is in a current charging operation mode, and to control the charging device to switch from the current charging operation mode to the voltage charging operation mode when any one of the detected voltages reaches a charge cut-off voltage.
6. The battery pack charging apparatus according to any one of claims 1 to 3, wherein the battery management system is further configured to detect a voltage of each battery cell in the battery pack when the charging device is in a voltage charging operation mode, and to control the charging device and the DC-AC conversion module and the AC-DC conversion module to stop operating when any one of the detected voltages reaches an alarm voltage.
7. The battery pack charging apparatus according to any one of claims 1 to 3, wherein the battery management system is further configured to detect a voltage of each battery cell in the battery pack when the charging device is in the voltage charging operation mode, and to control the charging device and the DC-AC conversion module and the AC-DC conversion module to stop operating when all detected voltages reach a charge cut-off voltage.
8. The battery pack charging apparatus according to any one of claims 1 to 3, wherein the battery management system is further configured to detect whether a voltage charging operation mode is performed during a last charging after the charging module outputs a current, and detect a remaining capacity of the battery pack;
if the process of the voltage charging working mode does not exist in the last charging, the battery management system controls the charging module to continue charging;
if the voltage charging working mode process exists in the last charging and the residual electric quantity of the battery pack is in the set range, the battery management system controls the charging module to continue charging;
and if the process of the voltage charging working mode existing in the last charging is judged and the residual electric quantity of the battery pack is not in the set range, the battery management system controls the output current of the charging module to be 0 and detects the open-circuit voltage of each battery unit in the battery pack after a second set time.
9. The battery pack charging apparatus of claim 8, wherein the battery management system is further configured to determine whether the open circuit voltage of each battery cell is within a predetermined average voltage range,
if yes, the battery management system controls the charging unit to continue charging in a current charging working mode;
otherwise, the battery management system gives an alarm and controls the charging unit to continue charging in a current charging working mode.
10. A battery pack charging method, comprising: the charging equipment charges the battery pack in a current charging working mode;
and detecting the voltage of each battery unit in the battery pack, and if any one detected voltage reaches a charging cut-off voltage, controlling the charging equipment to be switched from the current charging working mode to the voltage charging working mode by the battery management system.
11. The battery pack charging method according to claim 10, comprising:
when the charging device charges the battery pack in the voltage charging mode of operation,
the DC-AC conversion module detects the output voltage of the charging equipment, and if the output voltage reaches a first voltage threshold value, the DC-AC conversion module provides electric energy for the first induction coil;
the AC-DC conversion module detects the output voltage of the second induction coil and the voltage of the battery unit connected with the second induction coil, if the output voltage reaches a second voltage threshold value, the AC-DC conversion module charges the battery unit, and if the voltage of the battery unit reaches a charging cut-off voltage, the AC-DC conversion module stops running for a first set time.
12. The battery pack charging method according to claim 10, comprising: detecting a voltage of each battery cell in the battery pack;
if any one detection voltage reaches an alarm voltage, the battery management system controls the charging equipment, the DC-AC conversion module and the AC-DC conversion module to stop working;
and if all the detected voltages reach the charging cut-off voltage, the battery management system controls the charging equipment, the DC-AC conversion module and the AC-DC conversion module to stop working.
13. The battery pack charging method according to claim 11, comprising: after the charging module outputs current, the battery management system detects whether a voltage charging working mode exists in the last charging and detects the residual electric quantity of the battery pack;
if the process of the voltage charging working mode does not exist in the last charging, the battery management system controls the charging module to continue charging;
if the voltage charging working mode process exists in the last charging and the residual electric quantity of the battery pack is in the set range, the battery management system controls the charging module to continue charging;
and if the process of the voltage charging working mode existing in the last charging is judged and the residual electric quantity of the battery pack is not in the set range, the battery management system controls the output current of the charging module to be 0 and detects the open-circuit voltage of each battery unit in the battery pack after a second set time.
14. The battery pack charging method according to claim 13, further comprising:
the battery management system is further configured to determine whether the open circuit voltage of each cell is within a predetermined average voltage range,
if yes, the battery management system controls the charging unit to continue charging in a current charging working mode;
otherwise, the battery management system gives an alarm and controls the charging unit to continue charging in a current charging working mode.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104578316A (en) * | 2015-01-28 | 2015-04-29 | 深圳市良益实业有限公司 | Battery pack distribution multi-mode equalizing charge method and equalizing charge circuit |
| CN110212609A (en) * | 2019-06-19 | 2019-09-06 | 北京市亿微科技有限公司 | Battery pack equilibrium method and device based on wireless charging |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104578316A (en) * | 2015-01-28 | 2015-04-29 | 深圳市良益实业有限公司 | Battery pack distribution multi-mode equalizing charge method and equalizing charge circuit |
| CN110212609A (en) * | 2019-06-19 | 2019-09-06 | 北京市亿微科技有限公司 | Battery pack equilibrium method and device based on wireless charging |
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