CN114614116A - Dynamic balance repairing method for battery cell - Google Patents
Dynamic balance repairing method for battery cell Download PDFInfo
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- CN114614116A CN114614116A CN202210211491.9A CN202210211491A CN114614116A CN 114614116 A CN114614116 A CN 114614116A CN 202210211491 A CN202210211491 A CN 202210211491A CN 114614116 A CN114614116 A CN 114614116A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
- H02J7/0016—Circuits for equalisation of charge between batteries using shunting, discharge or bypass circuits
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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
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Abstract
The invention provides a dynamic balance repairing method for a battery cell in the technical field of battery cell balance, which comprises the following steps: step S10, connecting each balance module of the battery cell balance equipment to the positive electrode and the negative electrode of each battery cell of the lithium battery pack through a wire harness; step S20, setting a line resistance range, an internal resistance range, a maximum charging current, a maximum discharging current, a target voltage for balance repair and a number of battery cell sections for balance repair; step S30, charging and discharging each battery cell through each balancing module, and calculating the line resistance of each wire harness and the internal resistance of the battery cell; step S40, checking the line resistance and the internal resistance respectively based on the line resistance range and the internal resistance range; step S50, detecting the cell voltage of each cell through cell balancing equipment, and carrying out balanced repair on the cells based on the cell voltage, the target voltage and the cell node number; and step S60, calculating the real-time voltage of each battery cell for balanced repair until balanced repair is completed. The invention has the advantages that: the efficiency, the precision and the security of electric core restoration have greatly been promoted.
Description
Technical Field
The invention relates to the technical field of cell balancing, in particular to a dynamic balancing repair method for a cell.
Background
With the rise of new energy industry, in order to provide sufficient voltage for equipment, the lithium battery pack is usually formed by connecting a plurality of battery cells in series, but the capacity unbalance of the battery cells can directly influence the capacity of the whole lithium battery pack, so that the battery cells need to be repaired in a balanced manner after being used for a period of time.
As the types and the number of the battery cells of the lithium battery pack on the market are complicated, the scenes for balanced repair are very many, and a proper balancing method needs to be adapted in the balanced repair process. Traditionally, the cell is repaired in a balanced manner by adopting an odd-even balancing method, namely, the odd-even channels are repaired alternately, so that the time for repairing in a balanced manner is increased; in addition, the internal resistance and the line resistance of the battery core are not calculated in the prior art, and the calculation of the actual voltage of the battery core is influenced by different charging and discharging states among the battery cores (channels), so that the accuracy of the balance repair of the battery core is poor, and the battery core cannot be effectively protected.
Therefore, how to provide a dynamic balance repairing method for a battery cell to improve the efficiency, accuracy and safety of battery cell repairing becomes a technical problem to be solved urgently.
Disclosure of Invention
The invention aims to solve the technical problem of providing a dynamic and balanced cell repairing method, which can improve the cell repairing efficiency, precision and safety.
The invention is realized by the following steps: a dynamic balance repairing method for a battery cell comprises the following steps:
step S10, connecting each balance module of the battery cell balance equipment to the positive electrode and the negative electrode of each battery cell of the lithium battery pack through a wire harness, and carrying out power-on initialization;
step S20, setting a line resistance range, an internal resistance range, a maximum charging current, a maximum discharging current, a target voltage for balance repair and a number of battery cell sections for balance repair;
step S30, charging and discharging each battery cell through each balancing module, and calculating the line resistance of each wire harness and the internal resistance of the battery cell;
step S40, checking the line resistance and the internal resistance respectively based on the line resistance range and the internal resistance range;
step S50, detecting the cell voltage of each cell through cell balancing equipment, and carrying out balanced repair on the cells based on the cell voltage, the target voltage and the cell node number;
and step S60, calculating the real-time voltage of each battery cell for balanced repair in real time until balanced repair is completed.
Further, the step S30 specifically includes:
step S31, setting each battery cell of the lithium battery pack to be a cell1、cell2...cellnThe internal resistance of each battery cell is Ri1、Ri2...RinThe wire resistance of the wire harness for connecting each electric core is R respectively0、R1...Rn；
Step S32, the cell balancing equipment reads the no-load voltage V of each cellc1、Vc2…Vcn(ii) a The cell balancing equipment charges each cell individually through each balancing module by 1A current, and reads first voltage V when each cell is charged individually1 charger、V2 charging...Vn charger(ii) a The cell balancing equipment simultaneously uses 1A current to two adjacent cells through each balancing moduleCharging is carried out, and the second voltage V 'of each cell during charging is read'1 charger、V′2 charging...V′n charger；
Step S33, obtaining, based on each of the no-load voltage, the first voltage, and the second voltage:
Vn charger-Vcn＝(Rn-1+Rn+Rin)×1A＝Rn-1+Rn+Rin；
V′n charger+V′(n-1) charging-Vcn-Vc(n-1)＝(Rn-2+Ri(n-1)+Rn+Rin)×1A＝Rn-2+Ri(n-1)+Rn+Rin；
Deriving the intermediate line resistance and the intermediate internal resistance according to the two formulas:
Rn-1＝(V(n-1) charging+Vn charger-V′(n-1) charging-V′n charger)/2；
Ri(n-1)＝(2V′(n-1) charging+V′(n-2) charging-V′n charger-2Vc(n-1)-V(n-2) charging-Vn charger)/2；
And further deducing the line resistance and the internal resistance sum of the two ends:
further, the step S40 is specifically:
judging whether the line resistance exceeds the line resistance range or not, or whether the internal resistance exceeds the internal resistance range or not, if so, indicating that the connection of the wiring harness is abnormal or the internal resistance of the battery cell is abnormal, and entering the step S10 for rewiring; if not, the check is passed and the process proceeds to step S50.
Further, the step S50 is specifically:
the cell voltage of each cell is detected through cell balancing equipment, the cell voltage is subtracted from the corresponding target voltage based on the cell node number to obtain a pressure difference delta V, when the pressure difference delta V is larger than 0, the corresponding cell is charged through a balancing module, and when the pressure difference delta V is smaller than 0, the corresponding cell is discharged through the balancing module to start the balanced repair of the cell.
Further, the step S50 further includes:
in the process of carrying out equalization repair on the battery cell, the target voltage is used as a constant voltage value output by an equalization module, and the maximum charging current and the maximum discharging current are used as constant current values charged or discharged by the equalization module.
Further, the step S60 is specifically:
calculating real-time voltage of each battery cell subjected to balanced repair in real time until the real-time voltage is equal to target voltage, the charging current is equal to 0 or the discharging current is equal to 0, so as to finish balanced repair of the battery cells;
the real-time voltage calculation process of the middle cell is as follows:
A. when the (n-2) th cell, the (n-1) th cell and the nth cell are charged:
Vc(n-1)t＝V(n-1) charging-I(n-1) charging×(Rn-2+Rn-1+Ri(n-1))+I(n-2) charging×Rn-2+In charge t×Rn-1；
B. When the (n-2) th electricity-saving core, the (n-1) th electricity-saving core and the nth electricity-saving core are all discharging:
Vc(n-1)t＝V(n-1) placing t+I(n-1) placing t×(Rn-2+Rn-1+Ri(n-1))-I(n-2) placing t×Rn-2-In is put to t×Rn-1；
C. The (n-1) th electricity-saving core is charged, and when the (n-2) th electricity-saving core and the nth electricity-saving core are both discharged:
Vc(n-1)t＝V(n-1) charging-I(n-1) charging×(Rn-2+Rn-1+Ri(n-1))-I(n-2) placing t×Rn-2-In is put to t×Rn-1；
D. When the (n-1) th electricity-saving core discharges and the (n-2) th electricity-saving core and the nth electricity-saving core are charged:
Vc(n-1)t＝V(n-1) placing t+I(n-1) placing t×(Rn-2+Rn-1+Ri(n-1))+I(n-2) charging×Rn-2+In charge t×Rn-1；
E. When the (n-1) th electricity-saving core is charged, the (n-2) th electricity-saving core is discharged, and the nth electricity-saving core is charged:
Vc(n-1)t＝V(n-1) charging-I(n-1) charging×(Rn-2+Rn-1+Ri(n-1))-I(n-2) placing t×Rn-2+In charge t×Rn-1；
F. When the (n-1) th electricity-saving core is charged, the (n-2) th electricity-saving core is charged and the nth electricity-saving core is discharged:
Vc(n-1)t＝V(n-1) charging-I(n-1) charging×(Rn-2+Rn-1+Ri(n-1))+I(n-2) charging×Rn-2-In is put to t×Rn-1；
G. When the (n-1) th electricity-saving core discharges, the (n-2) th electricity-saving core charges and the nth electricity-saving core discharges:
Vc(n-1)t＝V(n-1) placing t+I(n-1) placing t×(Rn-2+Rn-1+Ri(n-1))-I(n-2) charging×Rn-2+In is put to t×Rn-1；
H. When the (n-1) th electricity-saving core discharges, the (n-2) th electricity-saving core discharges and the nth electricity-saving core charges:
Vc(n-1)t＝V(n-1) placing t+I(n-1) placing t×(Rn-2+Rn-1+Ri(n-1))+I(n-2) placing t×Rn-2-In charge t×Rn-1；
The real-time voltage calculation process of the battery cells at the two ends is as follows:
a. when the 1 st electricity-saving core and the 2 nd electricity-saving core are charged:
Vc1t＝V1 charging-I1 charging×(R0+R1+Ri1)+I2 charging×R1；
b. When the 1 st electricity core and the 2 nd electricity core are both discharging:
Vc1t＝V1 putting t+I1 putting t×(R0+R1+Ri1)-I2 charging×R1；
c. When the 1 st electricity-saving core is charged and the 2 nd electricity-saving core is discharged:
Vc1t＝V1 charging-I1 charging×(R0+R1+Ri1)-I2 put t×R1；
d. When the 1 st electricity-saving core discharges and the 2 nd electricity-saving core charges:
Vc1t＝V1 putting t+I1 putting t×(R0+R1+Ri1)+I2 charging×R1；
e. When the nth cell and the (n-1) th cell are charged:
Vcnt＝Vn charge t-In charge t×(Rn-1+Rn+Rin)+I(n-1) charging×Rn-1；
f. When the nth cell and the (n-1) th cell are both discharging:
Vcnt＝Vn is put to t+In is put to t×(Rn-1+Rn+Rin)-I(n-1) charging×Rn-1；
g. When the nth electricity-saving core is charged and the (n-1) th electricity-saving core is discharged:
Vcnt＝Vn charge t-In charge t×(Rn-1+Rn+Rin)-I(n-1) placing t×Rn-1；
h. When the nth electricity-saving core discharges and the (n-1) electricity-saving core charges:
Vcnt＝Vn is put to t+In is put to t×(Rn-1+Rn+Rin)+I(n-1) charging×Rn-1；
Wherein, VcntThe no-load voltage of the nth cell at the time t is represented; vn charge tThe output voltage of the nth equalizing module at the moment t is shown; i isn charge tThe output current of the nth equalizing module at the moment t is shown; vn is put to tThe output voltage of the nth equalizing module at the time t is shown when the equalizing module is discharged; i isn is put to tIndicates time tAnd n balancing output currents of the modules during discharging.
The invention has the advantages that:
the method comprises the steps that through setting a line resistance range, an internal resistance range, a maximum charging current, a maximum discharging current, a target voltage and a cell section number, each cell is charged and discharged through each balancing module to calculate the line resistance and the internal resistance, then the line resistance and the internal resistance are respectively checked based on the line resistance range and the internal resistance range, then the cell is subjected to balanced repair based on the detected cell voltage, the target voltage and the cell section number, and the real-time voltage of each cell subjected to balanced repair is calculated in real time; the method can select the corresponding cell section number to carry out balance repair as required, or carry out balance repair on all the cells simultaneously, and greatly improves the cell repair efficiency compared with the traditional odd-even balance method; real-time voltages of all the uniformly repaired battery cells are calculated in real time according to the charge-discharge states of the adjacent battery cells, and the voltage drop caused by line resistance and internal resistance is compensated in the calculation process, so that the repairing precision of the battery cells is greatly improved; the line resistance range and the internal resistance range are used for checking the line resistance and the internal resistance respectively, balanced repair is further carried out when abnormal wiring harness connection or abnormal internal resistance of the battery cell is avoided, and safety of battery cell repair is greatly improved.
Drawings
The invention will be further described with reference to the following examples with reference to the accompanying drawings.
Fig. 1 is a flowchart of a dynamic cell balancing repair method according to the present invention.
Fig. 2 is a hardware architecture diagram of the present invention.
Detailed Description
The technical scheme in the embodiment of the application has the following general idea: the corresponding cell section number is selected according to the requirement to carry out balanced repair so as to improve the cell repair efficiency; calculating real-time voltage of each cell for balanced repair in real time according to the charge-discharge state of the adjacent cells, and compensating voltage drop caused by line resistance and internal resistance in the calculation process so as to improve the repair precision of the cells; and respectively checking the line resistance and the internal resistance through the line resistance range and the internal resistance range so as to improve the safety of repairing the battery cell.
Referring to fig. 1 to fig. 2, a preferred embodiment of a dynamic cell balancing repair method according to the present invention includes the following steps:
step S10, connecting each balance module of the battery cell balance equipment to the positive electrode and the negative electrode of each battery cell of the lithium battery pack through a wire harness, and carrying out power-on initialization;
step S20, setting a line resistance range, an internal resistance range, a maximum charging current, a maximum discharging current, a target voltage for balance repair and a number of battery cell sections for balance repair; the cell section number can include all cells, namely, all cells are subjected to balanced repair simultaneously, so that the repair efficiency is improved;
step S30, charging and discharging each battery cell through each balancing module, and calculating the line resistance of each wire harness and the internal resistance of the battery cell;
step S40, checking the line resistance and the internal resistance respectively based on the line resistance range and the internal resistance range;
step S50, detecting the cell voltage of each cell through cell balancing equipment, and carrying out balanced repair on the cells based on the cell voltage, the target voltage and the cell node number;
step S60, calculating the real-time voltage of each battery cell for balanced repair in real time until the balanced repair is completed; in the real-time voltage calculation process, the line resistance and the internal resistance are compensated, so that the precision of the balance repair is improved.
The step S30 specifically includes:
step S31, setting each battery cell of the lithium battery pack to be a cell1、cell2...cellnThe internal resistance of each battery cell is Ri1、Ri2...RinThe wire resistance of the wire harness for connecting each electric core is R respectively0、R1...RnEach equalizing module is M1、M2...Mn；
Step S32, the cell balancing equipment reads the no-load voltage V of each cellc1、Vc2…Vcn(ii) a The cell balancing equipment charges each cell individually through each balancing module by 1A current, and reads first voltage V when each cell is charged individually1 charger、V2 charging...Vn charger(ii) a The cell equalization equipment sequentially and simultaneously charges two adjacent cells by using 1A current through each equalization module, and reads second voltage V 'when each cell is charged'1 charger、V′2 charging...V′n chargerFirstly, charging the 1 st electricity core and the 2 nd electricity core, then charging the 2 nd electricity core and the 3 rd electricity core, then charging the 3 rd electricity core and the 4 th electricity core, and so on;
based on the first voltage, one may obtain:
V1 charger-Vc1＝R0+R1+Ri1；
V2 charging-Vc2＝R1+R2+Ri2；
……
Vn charger-Vcn＝Rn-1+Rn+Rin；
Based on the second voltage, it is possible to:
V′2 charging+V′1 charger-Vc2-Vc1＝R0+Ri1+R2+Ri2；
……
V′n charger+V′(n-1) charging-Vcn-Vc(n-1)＝Rn-2+Ri(n-1)+Rn+Rin；
Step S33, obtaining, based on each of the no-load voltage, the first voltage, and the second voltage:
Vn charger-Vcn＝(Rn-1+Rn+Rin)×1A＝Rn-1+Rn+Rin；
V′n charger+V′(n-1) charging-Vcn-Vc(n-1)＝(Rn-2+Ri(n-1)+Rn+Rin)×1A＝Rn-2+Ri(n-1)+Rn+Rin；
Deriving the intermediate line resistance and the intermediate internal resistance according to the two formulas:
Rn-1＝(V(n-1) charging+Vn charger-V′(n-1) Charging device-V′n charger)/2；
The derivation process of the above equation is described by taking the 1 st cell and the 2 nd cell as examples:
V1 charger+V2 charging-V′1 charger-V′2 charging＝2R1；
R1＝(V1 charger+V2 charging-V′1 charger-V′2 charging)/2；
Ri(n-1)＝(2V′(n-1) charging+V′(n-2) charging-V′n charger-2Vc(n-1)-V(n-2) charging-Vn charger)/2；
The derivation process of the above formula is described by taking the 1 st cell, the 2 nd cell, and the 3 rd cell as examples:
and further deducing the line resistance and the internal resistance sum of the two ends:
the step S40 specifically includes:
judging whether the line resistance exceeds the line resistance range or not, or whether the internal resistance exceeds the internal resistance range or not, if so, indicating that the connection of the wire harness is abnormal or the internal resistance of the battery cell is abnormal, and entering the step S10 for rewiring; if not, the check is passed and the process proceeds to step S50.
The step S50 specifically includes:
the cell voltage of each cell is detected through cell balancing equipment, the cell voltage is subtracted from the corresponding target voltage based on the cell node number to obtain a pressure difference delta V, when the pressure difference delta V is larger than 0, the corresponding cell is charged through a balancing module, and when the pressure difference delta V is smaller than 0, the corresponding cell is discharged through the balancing module to start the balanced repair of the cell.
The step S50 further includes:
in the process of carrying out equalization repair on the battery cell, the target voltage is used as a constant voltage value output by an equalization module, and the maximum charging current and the maximum discharging current are used as constant current values charged or discharged by the equalization module.
The step S60 specifically includes:
calculating real-time voltage of each battery cell subjected to balanced repair in real time until the real-time voltage is equal to target voltage, the charging current is equal to 0 or the discharging current is equal to 0, so as to finish balanced repair of the battery cells;
the real-time voltage calculation process of the middle cell is as follows:
A. when the (n-2) th cell, the (n-1) th cell and the nth cell are charged:
Vc(n-1)t＝V(n-1) charging-I(n-1) charging×(Rn-2+Rn-1+Ri(n-1))+I(n-2) charging×Rn-2+In charge t×Rn-1；
B. When the (n-2) th electricity-saving core, the (n-1) th electricity-saving core and the nth electricity-saving core are all discharged:
Vc(n-1)t＝V(n-1) putting+I(n-1) placing t×(Rn-2+Rn-1+Ri(n-1))-I(n-2) placing t×Rn-2-In is put to t×Rn-1；
C. The (n-1) th electricity-saving core is charged, and when the (n-2) th electricity-saving core and the nth electricity-saving core are both discharged:
Vc(n-1)t＝V(n-1) charging-I(n-1) charging×(Rn-2+Rn-1+Ri(n-1))-I(n-2) placing t×Rn-2-In is put to t×Rn-1；
D. When the (n-1) th electricity-saving core discharges and the (n-2) th electricity-saving core and the nth electricity-saving core are charged:
Vc(n-1)t＝V(n-1) placing t+I(n-1) placing t×(Rn-2+Rn-1+Ri(n-1))+I(n-2) charging×Rn-2+In charge t×Rn-1；
E. When the (n-1) th electricity-saving core is charged, the (n-2) th electricity-saving core is discharged, and the nth electricity-saving core is charged:
Vc(n-1)t＝V(n-1) charging-I(n-1) charging×(Rn-2+Rn-1+Ri(n-1))-I(n-2) placing t×Rn-2+In charge t×Rn-1；
F. When the (n-1) th electricity-saving core is charged, the (n-2) th electricity-saving core is charged and the nth electricity-saving core is discharged:
Vc(n-1)t＝V(n-1) charging-I(n-1) charging×(Rn-2+Rn-1+Ri(n-1))+I(n-2) charging×Rn-2-In is put to t×Rn-1；
G. When the (n-1) th electricity-saving core discharges, the (n-2) th electricity-saving core charges and the nth electricity-saving core discharges:
Vc(n-1)t＝V(n-1) placing t+I(n-1) placing t×(Rn-2+Rn-1+Ri(n-1))-I(n-2) charging×Rn-2+In is put to t×Rn-1；
H. When the (n-1) th electricity-saving core discharges, the (n-2) th electricity-saving core discharges and the nth electricity-saving core charges:
Vc(n-1)t＝V(n-1) placing t+I(n-1) putting×(Rn-2+Rn-1+Ri(n-1))+I(n-2) placing t×Rn-2-In is charged with t×Rn-1；
By considering the charging and discharging states of the adjacent electric cores, the actual voltage calculation of the electric cores is not influenced by the charging and discharging of the adjacent electric cores, and the precision of the balance repair is greatly improved;
the real-time voltage calculation process of the battery cells at the two ends is as follows:
a. when the 1 st electricity-saving core and the 2 nd electricity-saving core are charged:
Vc1t＝V1 charging-I1 charging×(R0+R1+Ri1)+I2 fill t×R1；
b. When the 1 st electricity core and the 2 nd electricity core are both discharging:
Vc1t＝V1 putting t+I1 putting t×(R0+R1+Ri1)-I2 charging×R1；
c. When the 1 st electricity-saving core is charged and the 2 nd electricity-saving core is discharged:
Vc1t＝V1 charging-I1 charging×(R0+R1+Ri1)-I2 put t×R1；
d. When the 1 st electricity-saving core discharges and the 2 nd electricity-saving core charges:
Vc1t＝V1 putting t+I1 putting t×(R0+R1+Ri1)+I2 charging×R1；
e. When the nth cell and the (n-1) th cell are charged:
Vcnt＝Vn charge t-In charge t×(Rn-1+Rn+Rin)+I(n-1) charging×Rn-1；
f. When the nth cell and the (n-1) th cell are both discharging:
Vcnt＝Vn is put to t+In is put to t×(Rn-1+Rn+Rin)-I(n-1) charging×Rn-1；
g. When the nth electricity-saving core is charged and the (n-1) th electricity-saving core is discharged:
Vcnt＝Vn charge t-In charge t×(Rn-1+Rn+Rin)-I(n-1) placing t×Rn-1；
h. When the nth electricity-saving core discharges and the (n-1) electricity-saving core charges:
Vcnt＝Vn is put to t+In is put to t×(Rn-1+Rn+Rin)+I(n-1) charging×Rn-1；
Wherein, VcntThe no-load voltage of the nth cell at the time t is represented; vn charge tThe output voltage of the nth equalizing module at the moment t is shown; i isn charge tThe output current of the nth equalizing module during charging at the moment t is represented; vn is put to tThe output voltage of the nth equalizing module at the time t is shown when the equalizing module is discharged; i isn is put to tIndicates the output of the nth equalizing module at the time t when dischargingAnd (6) discharging current.
In conclusion, the invention has the advantages that:
the method comprises the steps that through setting a line resistance range, an internal resistance range, a maximum charging current, a maximum discharging current, a target voltage and a cell section number, each cell is charged and discharged through each balancing module to calculate the line resistance and the internal resistance, then the line resistance and the internal resistance are respectively checked based on the line resistance range and the internal resistance range, then the cell is subjected to balanced repair based on the detected cell voltage, the target voltage and the cell section number, and the real-time voltage of each cell subjected to balanced repair is calculated in real time; the method can select the corresponding cell section number to carry out balance repair as required, or carry out balance repair on all the cells simultaneously, and greatly improves the cell repair efficiency compared with the traditional odd-even balance method; real-time voltages of all the uniformly repaired battery cells are calculated in real time according to the charge-discharge states of the adjacent battery cells, and the voltage drop caused by line resistance and internal resistance is compensated in the calculation process, so that the repairing precision of the battery cells is greatly improved; the line resistance range and the internal resistance range are used for checking the line resistance and the internal resistance respectively, balanced repair is further carried out when abnormal wiring harness connection or abnormal internal resistance of the battery cell is avoided, and safety of battery cell repair is greatly improved.
Although specific embodiments of the invention have been described above, it will be understood by those skilled in the art that the specific embodiments described are illustrative only and are not limiting upon the scope of the invention, and that equivalent modifications and variations can be made by those skilled in the art without departing from the spirit of the invention, which is to be limited only by the appended claims.
Claims (6)
1. A dynamic balance repairing method for a battery core is characterized in that: the method comprises the following steps:
step S10, connecting each balance module of the battery cell balance equipment to the positive electrode and the negative electrode of each battery cell of the lithium battery pack through a wire harness, and carrying out power-on initialization;
step S20, setting a line resistance range, an internal resistance range, a maximum charging current, a maximum discharging current, a target voltage for balance repair and a number of battery cell sections for balance repair;
step S30, charging and discharging each battery cell through each balancing module, and calculating the line resistance of each wire harness and the internal resistance of the battery cell;
step S40, checking the line resistance and the internal resistance respectively based on the line resistance range and the internal resistance range;
step S50, detecting the cell voltage of each cell through cell balancing equipment, and carrying out balanced repair on the cells based on the cell voltage, the target voltage and the cell node number;
and step S60, calculating the real-time voltage of each battery cell for balanced repair in real time until balanced repair is completed.
2. The method for dynamically and uniformly repairing the battery cell according to claim 1, wherein: the step S30 specifically includes:
step S31, setting each battery cell of the lithium battery pack to be a cell1、cell2...cellnThe internal resistance of each battery cell is Ri1、Ri2...RinThe wire resistance of the wire harness for connecting each electric core is R respectively0、R1...Rn；
Step S32, the cell balancing equipment reads the no-load voltage V of each cellc1、Vc2...Vcn(ii) a The cell balancing equipment charges each cell individually through each balancing module by using 1A current, and reads a first voltage V when each cell is charged individually1 charger、V2 charging...Vn charger(ii) a The cell balancing equipment charges two adjacent cells at the same time through each balancing module by using 1A current, and reads second voltage V 'when each cell is charged'1 charger、V′2 charging...V′n charger；
Step S33, obtaining, based on each of the no-load voltage, the first voltage, and the second voltage:
Vn charger-Vcn＝(Rn-1+Rn+Rin)×1A＝Rn-1+Rn+Rin；
V′n charger+V′(n-1) charging-Vcn-Vc(n-1)＝(Rn-2+Ri(n-1)+Rn+Rin)×1A＝Rn-2+Ri(n-1)+Rn+Rin；
Deriving the intermediate line resistance and the intermediate internal resistance according to the two formulas:
Rn-1＝(V(n-1) charging+Vn charger-V′(n-1) charging-V′n charger)/2；
Ri(n-1)＝(2V′(n-1) charging+V′(n-2) charging-V′n charger-2Vc(n-1)-V(n-2) charging-Vn charger)/2；
And further deducing the line resistance and the internal resistance sum of the two ends:
3. the method for dynamically and uniformly repairing the battery cell according to claim 1, wherein: the step S40 specifically includes:
judging whether the line resistance exceeds the line resistance range or not, or whether the internal resistance exceeds the internal resistance range or not, if so, indicating that the connection of the wire harness is abnormal or the internal resistance of the battery cell is abnormal, and entering the step S10 for rewiring; if not, the check is passed and the process proceeds to step S50.
4. The method for dynamically and uniformly repairing the battery cell according to claim 1, wherein: the step S50 specifically includes:
the cell voltage of each cell is detected through cell balancing equipment, the cell voltage is subtracted from the corresponding target voltage based on the cell node number to obtain a pressure difference delta V, when the pressure difference delta V is larger than 0, the corresponding cell is charged through a balancing module, and when the pressure difference delta V is smaller than 0, the corresponding cell is discharged through the balancing module to start the balanced repair of the cell.
5. The method for dynamically and uniformly repairing the battery cell according to claim 1, wherein: the step S50 further includes:
in the process of carrying out equalization repairing on the battery cell, the target voltage is used as a constant voltage value output by an equalization module, and the maximum charging current and the maximum discharging current are used as constant current values of charging or discharging of the equalization module.
6. The method for dynamically and uniformly repairing the battery cell according to claim 1, wherein: the step S60 specifically includes:
calculating real-time voltage of each battery cell subjected to balanced repair in real time until the real-time voltage is equal to target voltage, the charging current is equal to 0 or the discharging current is equal to 0, so as to finish balanced repair of the battery cells;
the real-time voltage calculation process of the middle cell is as follows:
A. when the (n-2) th cell, the (n-1) th cell and the nth cell are charged:
Vc(n-1)t＝V(n-1) charging-I(n-1) charging×(Rn-2+Rn-1+Ri(n-1))+I(n-2) charging×Rn-2+In charge t×Rn-1；
B. When the (n-2) th electricity-saving core, the (n-1) th electricity-saving core and the nth electricity-saving core are all discharging:
Vc(n-1)t＝V(n-1) placing t+I(n-1) placing t×(Rn-2+Rn-1+Ri(n-1))-I(n-2) placing t×Rn-2-In is put to t×Rn-1；
C. The (n-1) th electricity-saving core is charged, and when the (n-2) th electricity-saving core and the nth electricity-saving core are both discharged:
Vc(n-1)t＝V(n-1) charging-I(n-1) charging×(Rn-2+Rn-1+Ri(n-1))-I(n-2) placing t×Rn-2-In is put to t×Rn-1；
D. When the (n-1) th electricity-saving core discharges and the (n-2) th electricity-saving core and the nth electricity-saving core are charged:
Vc(n-1)t＝V(n-1) placing t+I(n-1) placing t×(Rn-2+Rn-1+Ri(n-1))+I(n-2) charging×Rn-2+In is charged with t×Rn-1；
E. When the (n-1) th electricity-saving core is charged, the (n-2) th electricity-saving core is discharged and the nth electricity-saving core is charged:
Vc(n-1)t＝V(n-1) charging-I(n-1) charging×(Rn-2+Rn-1+Ri(n-1))-I(n-2) placing t×Rn-2+In charge t×Rn-1；
F. When the (n-1) th electricity-saving core is charged, the (n-2) th electricity-saving core is charged and the nth electricity-saving core is discharged:
Vc(n-1)t＝V(n-1) charging-I(n-1) charging×(Rn-2+Rn-1+Ri(n-1))+I(n-2) charging×Rn-2-In is put to t×Rn-1；
G. When the (n-1) th electricity-saving core discharges, the (n-2) th electricity-saving core charges and the nth electricity-saving core discharges:
Vc(n-1)t＝V(n-1) putting+I(n-1) placing t×(Rn-2+Rn-1+Ri(n-1))-I(n-2) charging×Rn-2+In is put to t×Rn-1；
H. When the (n-1) th electricity-saving core discharges, the (n-2) th electricity-saving core discharges and the nth electricity-saving core charges:
Vc(n-1)t＝V(n-1) placing t+I(n-1) putting×(Rn-2+Rn-1+Ri(n-1))+I(n-2) placing t×Rn-2-In charge t×Rn-1；
The real-time voltage calculation process of the battery cells at the two ends is as follows:
a. when the 1 st electricity-saving core and the 2 nd electricity-saving core are charged:
Vc1t＝V1 charging-I1 charging×(R0+R1+Ri1)+I2 charging×R1；
b. When the 1 st electricity core and the 2 nd electricity core are both discharging:
Vc1t＝V1 putting t+I1 putting t×(R0+R1+Ri1)-I2 charging×R1；
c. When the 1 st electricity-saving core is charged and the 2 nd electricity-saving core is discharged:
Vc1t＝V1 charging-I1 charging×(R0+R1+Ri1)-I2 put t×R1；
d. When the 1 st electricity-saving core discharges and the 2 nd electricity-saving core charges:
Vc1t＝V1 putting t+I1 putting t×(R0+R1+Ri1)+I2 charging×R1；
e. When the nth cell and the (n-1) th cell are charged:
Vcnt＝Vn charge t-In charge t×(Rn-1+Rn+Rin)+I(n-1) charging×Rn-1；
f. When the nth cell and the (n-1) th cell are both discharging:
Vcnt＝Vn is put to t+In is put to t×(Rn-1+Rn+Rin)-I(n-1) charging×Rn-1；
g. When the nth electricity-saving core is charged and the (n-1) th electricity-saving core is discharged:
Vcnt＝Vn is charged with t-In is charged with t×(Rn-1+Rn+Rin)-I(n-1) placing t×Rn-1；
h. When the nth electricity-saving core discharges and the (n-1) electricity-saving core charges:
Vcnt＝Vn is put to t+In is put to t×(Rn-1+Rn+Rin)+I(n-1) charging×Rn-1；
Wherein, VcntThe no-load voltage of the nth cell at the time t is represented; vn is charged with tThe output voltage of the nth equalizing module at the moment t is shown; i isn charge tThe output current of the nth equalizing module at the moment t is shown; vn is put to tThe output voltage of the nth equalizing module at the time t is shown when the equalizing module is discharged; i isn is put to tWhich represents the output current when the nth equalization module is discharged at time t.
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