CN113904410A - Low-cost storage battery pack equalization circuit and method - Google Patents
Low-cost storage battery pack equalization circuit and method Download PDFInfo
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- CN113904410A CN113904410A CN202111198852.2A CN202111198852A CN113904410A CN 113904410 A CN113904410 A CN 113904410A CN 202111198852 A CN202111198852 A CN 202111198852A CN 113904410 A CN113904410 A CN 113904410A
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- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000004804 winding Methods 0.000 claims abstract description 71
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical group [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 claims description 16
- 230000003071 parasitic effect Effects 0.000 claims description 5
- 239000004065 semiconductor Substances 0.000 claims description 4
- 230000005669 field effect Effects 0.000 claims description 3
- 238000007599 discharging Methods 0.000 abstract description 21
- 230000005611 electricity Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000010248 power generation Methods 0.000 description 3
- 230000032683 aging Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
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Classifications
-
- 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
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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
- H02J7/0019—Circuits for equalisation of charge between batteries using switched or multiplexed charge circuits
-
- 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
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
Abstract
The invention discloses a low-cost storage battery pack equalization circuit and a low-cost storage battery pack equalization method. Each single battery is connected with an equalizing unit. The balancing units are composed of MOSFETs and transformer windings which are connected in series between the positive electrode and the negative electrode of the single battery, and the transformer windings in each balancing unit are from the same shared multi-tap transformer; when the MOSFET is conducted, the single battery in the equalizing unit where the MOSFET is located discharges to the corresponding transformer winding; when the MOSFET is disconnected, the transformer in the other equalizing unit except the equalizing unit where the MOSFET is located charges the corresponding single battery through the winding on the common magnetic core. The method achieves the real efficient and safe dynamic active equalization charging and discharging of the battery pack, can protect the battery to the maximum extent, and fully exerts the energy of the battery pack. And only one multi-winding transformer is adopted, so that the hardware cost is greatly reduced.
Description
Technical Field
The invention relates to a storage battery pack equalization circuit, in particular to a low-cost storage battery pack equalization circuit and a low-cost storage battery pack equalization method, and belongs to the technical field of battery protection systems of storage batteries.
Background
The storage battery is widely used in various industries of society as an energy storage medium, and particularly in the industries of communication power supplies, UPS power supplies, various power vehicles, solar power generation, wind power generation, national smart grid and the like in recent years, the lithium iron phosphate battery is regarded as one of the most critical components in a system for storing power or power. The battery system charges and discharges a battery pack operating in a series, and characteristics of the respective unit cells in the battery pack, such as terminal voltage, internal resistance, aging degree, remaining capacity (SOC), battery health (SOH), and the like, may be different after each charge and discharge, and may further increase the difference between the unit cells over time. How to ensure that the battery pack is subjected to rapid and efficient dynamic active balance control in the charging and discharging processes is a key technology for ensuring the safety and reliability of the lithium iron phosphate battery and fully exerting the chemical efficiency of the lithium iron phosphate battery.
With the use of lithium iron phosphate batteries becoming more and more widespread, in recent years, devices and methods for charging and discharging series lithium iron phosphate batteries have been continuously improved, so as to try to achieve faster and more efficient protection and equalization of the batteries connected in series. In the traditional passive equalization method of the lithium iron phosphate battery, a discharge matrix network formed by a semiconductor switch device and a power resistor is utilized, the matrixes are applied to two ends of each single battery, and the single batteries with higher terminal voltage during charging are discharged in a proper amount, so that the voltage of each single battery in a battery pack is uniformly increased at the same speed as much as possible and is sufficient at the same time, and the purpose of passive equalization of series batteries is achieved; because the adopted power resistor can achieve the purpose of balancing only by discharging the single batteries, and the heating value of the resistor is large, the energy utilization rate of a charger at the front end of the battery pack is low, and the heat loss of the power generation by the resistor is large.
In the conventional battery pack discharging method, when one of the battery cells reaches the minimum terminal voltage required to be protected, the whole battery pack is forced to stop discharging, but at this time, a lot of residual energy may be left in other battery cells in good state, and therefore, the energy utilization rate of the battery pack is greatly influenced.
In the conventional lithium iron phosphate battery pack discharging method seen at present, the total voltage of battery packs connected in series is collected, and the terminal voltage of each single battery is not monitored; although this is simple, the electric quantity of each single battery is not uniform during the use process, and if the single battery is recycled for a long time, the difference of the electric quantity will become larger, so the single battery with smaller electric quantity will generate over-discharge, so that the recycling service life of the single battery is greatly reduced, and the use of the battery pack will be affected. The discharging method described above is often to set a battery discharging termination voltage, and when the total voltage of the collected battery is lower than the set value, the discharging of the battery is terminated. Because the end voltage cannot reflect the real end voltage of all the single batteries in the battery pack, some single batteries may have an over-discharge phenomenon when the discharge is ended, some single batteries may have a lot of residual electric quantity unused, and the utilization rate of the battery energy will be greatly reduced.
In the conventional lithium iron phosphate battery pack discharging method seen at present, the terminal voltage of the battery is taken as a judgment basis, when the terminal voltage of the battery reaches a certain value, the discharging is forcibly stopped, but under different practical use environments, such as higher environmental temperature, a great amount of residual electric quantity in the battery may not be released, and when the environmental temperature is lower, the battery is overdischarged, thereby causing damage to the battery.
In the traditional dynamic active equalization method for the lithium iron phosphate battery, the final voltage consistency of all the single batteries connected in series is used as the condition for ending the equalization work. This is not accurate. The actual amount of electricity stored in the battery is actually influenced by the temperature of the battery itself, the number of accumulated charge and discharge cycles, the degree of aging, the degree of health, the chemical characteristics of the battery itself, and the like. Under different temperatures and charge-discharge cycle times, the energy which can be stored and released when the lithium iron phosphate battery pack is fully charged is different, and the terminal voltages of the batteries are also different when the lithium iron phosphate battery pack is fully charged. For example, in a low-temperature environment, the amount of energy that can be stored in the battery pack is small, the terminal voltage at the time of full charge is high, and the like. In order to utilize the amount of electricity stored in the battery pack to the maximum, it is necessary that the charging and discharging device be able to fully charge the maximum amount of electricity storable in the battery and be able to release all the amount of electricity stored in the battery pack to supply the external load under different environments. It is worth mentioning that due to the manufacturing process error of each single battery in the lithium iron phosphate battery pack and the like, when the lithium iron phosphate battery pack is charged in series, the electric quantity of the battery pack has certain difference, and the difference can be gradually increased in the using process, which affects the normal operation of the whole battery pack, so that the charging and discharging device is required to eliminate the difference, and the battery pack is always kept in a balanced state in the charging and discharging processes.
Disclosure of Invention
The present invention is directed to a battery pack equalization circuit and method with low cost.
The invention realizes the purpose through the following technical scheme: a low-cost battery pack equalization circuit includes
The storage battery pack comprises a plurality of single batteries connected in series;
the balancing module comprises a plurality of balancing units with the same number as the single batteries, and each single battery is connected with an independent balancing unit; the balancing unit consists of an MOSFET and a transformer winding which are connected in series between the anode and the cathode of the single battery; the transformer winding in each equalizing unit is from different windings of the same multi-winding transformer;
the external control circuit is used for controlling the conduction of the MOSFET;
when the MOSFET is conducted, the single battery in the equalizing unit where the MOSFET is located discharges to the corresponding transformer winding; when the MOSFET is disconnected, the transformer windings in other equalizing units except the equalizing unit where the MOSFET is located charge the corresponding single batteries.
As a still further scheme of the invention: the MOSFET is a P-MOSFET, the S pole of the MOSFET is connected with the anode of the single battery, the D pole of the MOSFET is connected with the dotted terminal of the transformer winding, and the G pole of the MOSFET is used as a control terminal and connected with the external control circuit.
As a still further scheme of the invention: the MOSFET is an N-MOSFET, the D pole of the MOSFET is connected with the anode of the single battery, the S pole of the MOSFET is connected with the dotted terminal of the transformer winding, and the G pole of the MOSFET is used as a control terminal and connected with the external control circuit.
As a still further scheme of the invention: the number of turns of the transformer winding in each equalizing unit is the same.
As a still further scheme of the invention: the multi-winding transformer is a multi-tap high-frequency power transformer.
A low-cost equalizing method for an equalizing circuit of a storage battery pack comprises the following steps:
step one, arranging an independent balancing unit on each single battery, wherein each balancing unit consists of an MOSFET (metal-oxide-semiconductor field effect transistor) and a transformer winding which are connected between the anode and the cathode of each single battery in series, and the transformer winding in each balancing unit is from a plurality of windings of the same multi-winding transformer;
step two, controlling the conduction of the MOSFET by using an external control circuit;
when the electric quantity difference between the single batteries in the storage battery pack is larger than a set value, the MOSFET in the balancing unit where the single battery with higher electric quantity is located is conducted through the external control circuit, and the excess electric quantity in the single battery is transferred to the corresponding transformer winding; the previously conducting MOSFET is then turned off, at which point the transformer windings in the other equalizing cells will charge their corresponding cells through the parasitic reverse body diode inside the MOSFET.
As a still further scheme of the invention: in the third step, when the storage battery pack is charged, the electric quantity value and the voltage value of each single battery are always controlled not to be larger than the maximum allowable rated value; when the storage battery pack is discharged by switching on a load, the electric quantity value and the voltage value of each single battery are always controlled to be not less than the minimum allowable rated value.
As a still further scheme of the invention: the single battery is a lithium iron phosphate battery.
The invention has the beneficial effects that: the dynamic electric quantity and voltage of each single battery are used as judgment bases, when the difference between the electric quantity and the voltage of the single batteries is large in the charging process of the storage battery pack, the single batteries with the high electric quantity and voltage are discharged in a proper amount, the discharged electric quantity is transferred to other single batteries, other backward batteries are charged, and dynamic balance in the charging process is realized; similarly, in the process that the storage battery pack is connected with a load to discharge, the single batteries with high electric quantity and voltage transfer the excessive electric quantity to the single batteries with low electric quantity and voltage through the discharging circuit and the charging circuit, so that dynamic balance in the discharging process is realized, the real efficient and safe dynamic active balance charging and discharging of the storage battery pack are finally realized, the batteries can be protected to the maximum extent, and the energy of the storage battery pack is fully exerted.
Drawings
FIG. 1 is a schematic diagram of a connection structure of an equalizing circuit in which n single batteries are connected in series according to the present invention;
FIG. 2 is a schematic diagram of an equalizing unit connected to a single battery according to the present invention;
FIG. 3 is a schematic diagram of the operation timing sequence of the CELL CELL-1 for transferring energy to the CELL-2-CELL-n balancing circuits.
In the figure: 11. transformer winding, 21, MOSFET, 30, multi-winding transformer, 1, G pole, 2, D pole and 3, S pole.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
Referring to fig. 1 to 3, a low-cost equalizing circuit for a battery pack includes
The storage battery pack comprises a plurality of single batteries connected in series;
the balancing module comprises a plurality of balancing units with the same number as the single batteries, and each single battery is connected with an independent balancing unit; the equalizing unit consists of a MOSFET21 and a transformer winding 11 which are connected in series between the anode and the cathode of the single battery; and the transformer winding 11 in each equalizing unit is from different windings of the same multi-winding transformer 30;
an external control circuit for controlling the conduction of the MOSFET 21;
when the MOSFET21 is turned on, the single battery in the equalizing unit where the MOSFET21 is located discharges to the corresponding transformer winding 11; when the MOSFET21 is turned off, the transformer winding 11 in the equalization unit other than the equalization unit in which the MOSFET21 is located charges the corresponding battery cell.
In the embodiment of the present invention, the MOSFET21 is a P-MOSFET, the S-pole 3 of the MOSFET is connected to the positive pole of the battery cell, the D-pole 2 of the MOSFET is connected to the end of the transformer winding 11 with the same name, and the G-pole 1 of the MOSFET is used as a control end and is connected to the external control circuit.
In the embodiment of the present invention, the MOSFET21 is an N-MOSFET, the D pole 2 of the MOSFET is connected to the positive pole of the battery cell, the S pole 3 of the MOSFET is connected to the end of the transformer winding 11 with the same name, and the G pole 1 of the MOSFET is connected to the external control circuit as a control end.
In the embodiment of the present invention, the number of turns of the transformer winding 11 in each of the equalizing units is the same.
In the embodiment of the present invention, the multi-winding transformer 30 is a multi-tap high-frequency power transformer.
Example two
Referring to fig. 1 to 3, an equalizing method of an equalizing circuit of a low-cost battery pack includes the following steps:
step one, arranging an independent balancing unit on each single battery, wherein each balancing unit consists of an MOSFET (metal-oxide-semiconductor field effect transistor) and a transformer winding which are connected between the anode and the cathode of each single battery in series, and the transformer winding in each balancing unit is from a plurality of windings of the same multi-winding transformer;
step two, controlling the conduction of the MOSFET by using an external control circuit;
when the electric quantity difference between the single batteries in the storage battery pack is larger than a set value, the MOSFET in the balancing unit where the single battery with higher electric quantity is located is conducted through the external control circuit, and the excess electric quantity in the single battery is transferred to the corresponding transformer winding; the previously conducting MOSFET is then turned off, at which point the transformer windings in the other equalizing cells will charge their corresponding cells through the parasitic reverse body diode inside the MOSFET.
In the embodiment of the invention, in the third step, when the storage battery pack is charged, the electric quantity value and the voltage value of each single battery are always controlled not to be larger than the maximum allowable rated value; when the storage battery pack is discharged by switching on a load, the electric quantity value and the voltage value of each single battery are always controlled to be not less than the minimum allowable rated value.
In the embodiment of the invention, the single battery is a lithium iron phosphate battery.
EXAMPLE III
Referring to fig. 1 to 3, a low-cost equalizing circuit for a battery pack, taking an equalizing circuit formed by connecting n single batteries in series as an example, each single battery is provided with an independent equalizing unit, and n P-MOSFETs and n transformer tap windings are shared, taking a first single battery CELL-1 as an example: the equalizing unit connected with the single battery consists of an MOSFET21 and a transformer winding 11 which are connected in series between the anode and the cathode of the single battery CELL-1; the MOSFET21 has its S pole 3 connected to the positive pole of the CELL CELL-1, its D pole 2 connected to the end of the transformer winding 11, and its G pole 1 as the control end connected to the external control circuit, and the external circuit gives control signals to turn ON/OFF the battery. The equalization units connected to each cell are identical, except that the transformer windings in each equalization unit are from different windings on a common multi-tap high frequency power transformer 30.
The working principle is as follows: in the using process, the dynamic electric quantity in the charging and discharging process of the single batteries is calculated by using the charging current of the storage battery pack or the discharging current of the storage battery pack to the outside and the time, when the difference value of the dynamic electric quantity and the terminal voltage between the single batteries is larger than a set value, the dynamic active equalization of the electric quantity and the voltage is carried out, and the MOSFET connected with the single battery with higher electric quantity is conducted through an external control circuit. The positive pole of the single battery which is gated, a P-MOSFET and a side winding of a high-frequency power transformer form a series loop, when the corresponding MOSFET is conducted, the connected transformer winding is charged, the current rises and starts to store energy, and the corresponding battery CELL is discharged because the winding of the transformer and the connection of the power device are in a forward excitation mode; in the case of a transformer that is not saturated, the joule energy P stored by the transformer winding is: p ═ I × L/2 (where I is the maximum current to which the transformer winding inductance rises in amperes; L is the inductance of the transformer winding inductance in henry). After the transformer winding is charged, the MOSFET which is turned on before needs to be turned off immediately, at the moment when the transformer winding is charged, because the MOSFET, the transformer winding and the like which are connected in series on each other single battery also form a series loop, because a parasitic reverse body diode is arranged in the power MOSFET and the connection framework of the whole circuit is a forward excitation structure, the winding which is connected in series on other single batteries forms a charging loop through the parasitic reverse body diode of the MOSFET which is connected in series, the winding starts to be charged, the current rises, and the corresponding single battery is charged; finally, the discharged energy of the battery is transferred to other batteries, and dynamic active equalization is completed. And in the whole using process, the dynamic electric quantity value and the voltage value of the single battery are always controlled to be not more than the maximum allowable rated value during charging and not less than the minimum allowable rated value during discharging.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (8)
1. A low cost battery pack equalization circuit, characterized by: comprises that
The storage battery pack comprises a plurality of single batteries connected in series;
the balancing module comprises a plurality of balancing units with the same number as the single batteries, and each single battery is connected with an independent balancing unit; the balancing unit consists of an MOSFET (21) and a transformer winding (11) which are connected in series between the anode and the cathode of the single battery; and the transformer windings (11) in each equalizing unit are from different windings of the same multi-winding transformer (30);
an external control circuit for controlling the conduction of the MOSFET (21);
when the MOSFET (21) is conducted, the single battery in the equalizing unit where the MOSFET (21) is located discharges to the corresponding transformer winding (11); when the MOSFET (21) is switched off, the transformer winding (11) in the other equalizing unit except the equalizing unit where the MOSFET (21) is located charges the corresponding single battery.
2. A low cost battery pack equalization circuit as claimed in claim 1, wherein: the MOSFET (21) is a P-MOSFET, the S pole (3) of the MOSFET is connected with the anode of the single battery, the D pole (2) of the MOSFET is connected with the dotted terminal of the transformer winding (11), and the G pole (1) of the MOSFET is used as a control terminal and is connected with the external control circuit.
3. A low cost battery pack equalization circuit as claimed in claim 1, wherein: the MOSFET (21) is an N-MOSFET, the D pole (2) of the MOSFET is connected with the anode of the single battery, the S pole (3) of the MOSFET is connected with the dotted terminal of the transformer winding (11), and the G pole (1) of the MOSFET is used as a control terminal and connected with the external control circuit.
4. A low cost battery pack equalization circuit as claimed in claim 1, wherein: the number of turns of the transformer winding (11) in each equalizing unit is the same.
5. A low cost battery pack equalization circuit as claimed in claim 1, wherein: the multi-winding transformer (30) is a multi-tap high-frequency power transformer.
6. A low-cost equalizing method for a battery pack equalizing circuit according to any one of claims 1 to 5, wherein: the equalizing method comprises the following steps
Step one, arranging an independent balancing unit on each single battery, wherein each balancing unit consists of an MOSFET (metal-oxide-semiconductor field effect transistor) and a transformer winding which are connected between the anode and the cathode of each single battery in series, and the transformer winding in each balancing unit is from a plurality of windings of the same multi-winding transformer;
step two, controlling the conduction of the MOSFET by using an external control circuit;
when the electric quantity difference between the single batteries in the storage battery pack is larger than a set value, the MOSFET in the balancing unit where the single battery with higher electric quantity is located is conducted through the external control circuit, and the excess electric quantity in the single battery is transferred to the corresponding transformer winding; the previously conducting MOSFET is then turned off, at which point the transformer windings in the other equalizing cells will charge their corresponding cells through the parasitic reverse body diode inside the MOSFET.
7. The equalizing method for a low-cost equalizing circuit for secondary batteries according to claim 6, wherein: in the third step, when the storage battery pack is charged, the electric quantity value and the voltage value of each single battery are always controlled not to be larger than the maximum allowable rated value; when the storage battery pack is discharged by switching on a load, the electric quantity value and the voltage value of each single battery are always controlled to be not less than the minimum allowable rated value.
8. The equalizing method for a low-cost equalizing circuit for secondary batteries according to claim 6, wherein: the single battery is a lithium iron phosphate battery.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111198852.2A CN113904410A (en) | 2021-10-14 | 2021-10-14 | Low-cost storage battery pack equalization circuit and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111198852.2A CN113904410A (en) | 2021-10-14 | 2021-10-14 | Low-cost storage battery pack equalization circuit and method |
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| CN113904410A true CN113904410A (en) | 2022-01-07 |
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| CN202111198852.2A Pending CN113904410A (en) | 2021-10-14 | 2021-10-14 | Low-cost storage battery pack equalization circuit and method |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202309117U (en) * | 2011-10-08 | 2012-07-04 | 上海锂曜能源科技有限公司 | Balanced system for storage battery pack |
| CN103036258A (en) * | 2011-10-08 | 2013-04-10 | 上海锂曜能源科技有限公司 | Battery pack balancing system and method |
| CN103036256A (en) * | 2011-10-08 | 2013-04-10 | 上海锂曜能源科技有限公司 | Transformer scan chain type storage battery equalizing circuit and method |
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2021
- 2021-10-14 CN CN202111198852.2A patent/CN113904410A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202309117U (en) * | 2011-10-08 | 2012-07-04 | 上海锂曜能源科技有限公司 | Balanced system for storage battery pack |
| CN103036258A (en) * | 2011-10-08 | 2013-04-10 | 上海锂曜能源科技有限公司 | Battery pack balancing system and method |
| CN103036256A (en) * | 2011-10-08 | 2013-04-10 | 上海锂曜能源科技有限公司 | Transformer scan chain type storage battery equalizing circuit and method |
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Application publication date: 20220107 |