CN111431232A - Retired battery module protected by flexible connection - Google Patents
Retired battery module protected by flexible connection Download PDFInfo
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- CN111431232A CN111431232A CN202010248018.9A CN202010248018A CN111431232A CN 111431232 A CN111431232 A CN 111431232A CN 202010248018 A CN202010248018 A CN 202010248018A CN 111431232 A CN111431232 A CN 111431232A
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- 238000004891 communication Methods 0.000 claims description 13
- 230000000903 blocking effect Effects 0.000 claims description 10
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- 238000001514 detection method Methods 0.000 claims description 6
- 238000012545 processing Methods 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 description 9
- 238000007726 management method Methods 0.000 description 5
- 230000002457 bidirectional effect Effects 0.000 description 4
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- 239000004020 conductor Substances 0.000 description 2
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- 238000004146 energy storage Methods 0.000 description 2
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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
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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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
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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 relates to a retired battery module protected by flexible connection, which is used for grouping differentiated retired battery modules and realizing echelon battery utilization. The battery module flexible connection module is provided with an execution and monitoring unit, can detect the voltage and the temperature of the battery and the module and uploads the voltage and the temperature. In the battery charging and discharging process, when the battery voltage exceeds the normal working voltage range of the battery, the battery is withdrawn, the battery is protected, and meanwhile, the differentiated retired battery modules are grouped and the gradient battery utilization is realized through the uniform charging control function. The invention also relates to a battery pack which is formed by sequentially connecting a plurality of battery modules in series by using the battery module flexible connecting device.
Description
Technical Field
The invention relates to the field of new energy, in particular to a retired battery module protected by flexible connection.
Background
According to the development and planning of electric vehicles, the production capacity of pure electric vehicles and plug-in hybrid electric vehicles reaches 200 thousands of vehicles and the accumulated production and sales volume exceeds 500 thousands of vehicles by 2020. These electric vehicles will produce a large number of retired power batteries. Although the retired battery is not suitable for being used on an electric automobile, the retired battery still has energy storage with the rated capacity of about 80%, and can be applied to other fields, and serious energy waste is caused if the retired battery is directly discarded. Therefore, in order to fully utilize the value of the power battery and save social resources, the retired power battery needs to be utilized in a graded manner.
Whether new batteries or retired power batteries, battery grouping technology is the key to the large-scale application of power batteries. When constructing a power battery assembly of an electric automobile or an energy storage device, firstly, a plurality of single battery cores are fixed in series-parallel connection in a welding mode to form a battery module, and then the plurality of battery modules are connected in series-parallel connection through conductors to form the whole battery assembly. Although different manufacturers define different capacities and voltage levels for battery modules and may define a plurality of layers of battery modules, the battery modules are generally understood as basic units constituting a battery, which are easily physically separated from the battery. Generally, the voltage level of the battery module is several tens of volts, and the capacity is several hundreds of ampere hours.
The primary factor affecting the echelon utilization economy of a retired power battery is the degree of disassembly of the battery assembly (battery pack). According to the existing production practice, if the battery packs welded into a whole in the retired power battery are disassembled into single battery cells one by one, then screening, matching and recombination are carried out, and the recovery cost is close to the purchase of a new battery due to the complex process, the echelon utilization of the technical route is determined to be uneconomical and scientific. But flexible grouping for battery modules is a reasonable way to retire the power battery echelon utilization if the connection conductors are simply removed. Therefore, flexible group connection is carried out to the nonconformity of battery module, has just become the key problem that retired power battery echelon utilized.
In the grouping use of power batteries, the problem of differential management caused by the inconsistency of battery modules needs to be solved. During use of a battery, the consistency of the battery is constantly deteriorating over time, depending on a number of factors, including: production consistency, use environment, charge and discharge intensity, instantaneous discharge and the like. Especially for the retired batteries, the problems of increased pressure difference among the batteries in groups, serious heating of single batteries and the like are often caused due to the difference of materials, processes and transportation working conditions, flexible connection is needed, and the normal operation of the whole battery pack is ensured by a uniform control protection means.
In summary, the above solutions have problems of high cost, complicated circuit structure, lack of over-voltage and over-current protection functions, or lack of uniform charge control. Therefore, there is a need for a flexible connection protection device with low cost, simple circuit structure, low price, and capable of realizing overvoltage and overcurrent protection and equalization control functions, so as to realize grouping of differentiated retired battery modules and realize utilization of stepped batteries.
Disclosure of Invention
The application provides a can realize overvoltage and overcurrent protection simultaneously to battery module flexonics protection device who has homogeneous charge control function, thereby realize that differentiated retired battery module is in groups and realize echelon battery and utilize.
In a first aspect, the present application provides a retired battery module flexible connection module, including: the charging and discharging control system comprises a charging and discharging switch (K1), a charging diode (D1), a bypass switch (K2), a bypass diode (D2) and a monitoring control unit;
wherein the content of the first and second substances,
the charging and discharging switch (K1) and the bypass switch (K2) should be mechanically or logically interlocked;
one end of the charge and discharge switch (K1) is connected with the "+" of the battery interface, and the other end of the charge and discharge switch is connected with the "+" of the charge and discharge interface, so that the charge and discharge of the battery module are realized;
one end of the bypass switch (K2) is connected with the "+" of the charge-discharge interface, and the other end of the bypass switch is connected with the "-" of the charge-discharge interface, so that the bypass of the battery module is realized;
the anode of the charging diode (D1) is connected with the "+" of the charging and discharging interface, and the cathode of the charging diode is connected with the "-" of the battery interface, so that the follow current during the action of the charging and discharging switch (K1) and the blocking during the bypass of the battery module are realized;
the cathode of the bypass diode (D2) is connected with the "+" of the charge-discharge interface, the anode of the bypass diode is connected with the "-" of the charge-discharge interface, the follow current when the bypass switch (K2) acts and the blocking of the battery module from the bypass state to the access state are realized by only four switch elements, the integral function of the circuit is realized, the redundant design is avoided, the circuit response is more sensitive, and the cost is lower.
Simultaneously, this application still provides the retired battery module who adopts the flexonics protection, and it includes: the system comprises a plurality of groups of retired battery modules and a master control device, wherein the retired battery modules and the master control device are connected in series by flexible connecting devices, the master control device is used for collecting voltage, current and temperature information of the plurality of groups of retired battery modules and realizing centralized control of the single retired battery modules so as to avoid over-current and over-voltage and realize uniform charging, the master control device detects whether the voltage difference between the single retired battery modules in a low-voltage area is smaller than a set threshold value or not when the voltage difference between the single retired battery modules in the low-voltage area is not smaller than the set threshold value, the master control device controls to start a uniform charging means in a lower-voltage area when the detection result is negative, the single voltage of the retired battery modules at the moment is lower, the set uniform starting threshold value is larger, and;
if the result of the search is negative, starting a uniform means for charging the upper voltage area and then continuing charging until the result of the detection is positive, and further directly detecting whether the voltage of the single body of the retired battery module is larger than the overcharge threshold value, and if the result of the search is positive, finishing the charging of the retired battery module.
An ① th port of the monitoring control unit in the single retired battery module is connected with a voltage and temperature acquisition interface of the battery module, a ② th port is an external communication interface, and a ③ th port controls the actions of a charging and discharging switch (K1) and a bypass switch (K2);
the input of the monitoring control unit is the voltage and the temperature of the battery module;
the output of the monitoring control unit is control and power driving signals of a charging and discharging switch (K1) and a bypass switch (K2). The communication interface of the monitoring control unit is responsible for an external communication interface;
the monitoring control unit realizes the monitoring of the voltage and the temperature of the battery module, controls the actions of the charge and discharge switch (K1) and the bypass switch (K2) and is responsible for external communication.
Preferably, the charge and discharge switch (K1) and the bypass switch (K2) are magnetic latching relays;
the charging diode (D1) and the bypass diode (D2) are power diodes;
the monitoring control unit is realized based on a digital circuit or an analog logic circuit.
Further, the monitoring control unit is realized based on a digital processing chip.
The flexible connection module of the battery module has the following working states:
and (3) charging and discharging states: the charging and discharging switch (K1) is closed, and other switches are all opened;
a bypass state: the bypass switch (K2) is closed, and other switches are all opened;
further, the monitoring control unit includes the following functions:
the battery voltage and temperature acquisition and uploading device is used for a battery management system BMS of an upper computer to estimate the SOC and SOH of the battery and judge the voltage threshold of the battery;
communication chips such as RS485 or CAN are adopted for realizing communication with superior control and BMS;
the control signal is converted into a driving signal with certain power to drive the charging and discharging switch (K1) or the bypass switch (K2) to act.
When the monitoring control unit receives the bypass command, the monitoring control unit sends the bypass command, executes the process of converting the charging and discharging state into the bypass state and quits the battery; and when the monitoring control unit receives a battery access command, the monitoring control unit sends the access command, executes the process of converting the bypass state into the charge-discharge state and accesses the battery.
In a second aspect, the present application provides a battery pack, including a plurality of battery modules, a plurality of battery module flexible connection module and a DC/AC bidirectional converter, a plurality of battery modules pass through a plurality of battery module flexible connection modules establish ties in proper order, and the output of the battery module combination that obtains after establishing ties passes through DC/AC bidirectional converter converts the commercial power into.
Compared with the prior art, the application has the technical effects that:
(1) the circuit of the invention has simple structure, realizes the whole function of the circuit only by four switch elements, avoids redundant design, and ensures that the circuit has more sensitive response and lower cost; for a single retired battery module, flexible connection of the battery module is realized by controlling the state conversion of the bypass exit and the access (charge and discharge) state, so that the battery module can be replaced without stopping the whole machine;
(2) the invention realizes the overcurrent and overvoltage protection of the battery module by controlling the conversion into a bypass exit mechanism;
(3) the general control device can integrally adopt a specific uniform charging control strategy to realize a uniform control function; the flexible connection can be compatible with different types of battery modules for use in groups; the standard structure, the control is simple, and the cost is low; grouping of differentiated retired battery modules can be achieved, and echelon battery utilization is achieved;
(4) the scheme can well solve the problem of flexible connection of the battery module, and is a better scheme for solving the problem of how to convert a 12V or 48V standard battery module into mains supply alternating current 380V.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a circuit diagram of a flexible connection device for a single retired battery module according to an embodiment of the present invention;
fig. 2 is a schematic view of connecting a plurality of battery modules using the battery module flexible connecting apparatus of fig. 1.
Detailed Description
For further explanation of the various embodiments, the drawings are provided as part of the present disclosure and serve primarily to illustrate embodiments which may be combined or consolidated and which, in conjunction with the description given herein, explain the principles of operation of the embodiments and, with reference thereto, will enable those skilled in the art to understand other possible embodiments and advantages of the present disclosure, wherein elements are not drawn to scale and wherein like reference numerals are generally used to refer to like elements. Specific embodiments of the inventive concept will now be described in detail with reference to the accompanying drawings.
Embodiment 1, referring to fig. 1, a device for flexibly connecting and protecting a single retired battery module includes a charge and discharge switch (K1), a charge diode (D1), a bypass switch (K2), a bypass diode (D2), and a monitoring control unit, where the charge and discharge switch (K1) and the bypass switch (K2) should be mechanically or logically interlocked, where one end of the charge and discharge switch (K1) is connected to the "+" of the battery interface, and the other end is connected to the "+" of the charge and discharge interface to achieve charging and discharging of the battery module, one end of the bypass switch (K2) is connected to the "+" of the charge and discharge interface, and the other end is connected to the "-" of the charge and discharge interface to achieve bypassing of the battery module, an anode of the charge diode (D1) is connected to the "+" of the charge and discharge interface, a cathode is connected to the "-" of the battery interface, and a blocking of the battery module is achieved when the bypass switch (K1) operates, a freewheeling is disconnected from a cathode of the bypass diode (D2) is connected to the "+" of the charge and anode of the charge and the bypass interface is connected to the bypass switch (K9685) to achieve blocking of the bypass control unit connected to the bypass switch (K9636) and the bypass switch control unit connected to the bypass interface.
In one embodiment, the flexible connection device for battery module in fig. 1 has two working states during operation, which are: the charging and discharging states and the bypass state, and the state combination of each circuit element under different working states is shown in table 1.
And (3) charging and discharging states: k1 is closed, other switches are all opened, and the battery is in a charging and discharging state. When the battery is in a charging state, current flows into the battery end. When the battery is in a discharged state, current flows out of the battery.
A bypass state: k2 is closed and the other switches are open. The bypass state may be used to protect the battery or to replace the battery.
TABLE 1
| K1 | K2 | Status of state |
| Closure is provided | Disconnect | Charge and discharge |
| Disconnect | Closure is provided | Bypass path |
In one embodiment, the flexible connection device for the battery module can also be switched between a charge-discharge state and a bypass state, and the switching process is as follows:
1. transition from bypass state to charge state:
opening K2 → D1 freewheel → closing K1, and the conversion process is completed. During the conversion process, D1 is conducted for a short time (tens of milliseconds), and a radiator is not needed;
2. transition from bypass state to discharge state:
opening K2 → D2 freewheeling → closing K1 → D2 blocking, and the conversion process is completed. During the transition, D2 was on for a short time (tens of milliseconds) without the need for a heat sink.
3. The conversion process between the charge and discharge states:
since the K1 is in the closed state during charging (discharging), the charging and discharging conversion is naturally performed.
4. The charging state is converted into a bypass state:
opening K1 → D1 freewheeling → closing K2 → D1 blocking, and the conversion process is completed.
5. The discharge state is converted into a bypass state:
opening K1 → D2 freewheeling → closing K2 → D2 blocking, and the conversion process is completed.
In one embodiment, the monitoring control unit collects and uploads a battery voltage signal and a temperature signal, and the battery voltage signal and the temperature signal are used for estimating the SOC and the SOH of a battery by a battery management system BMS of an upper computer and judging a battery voltage threshold; communication chips such as RS485 or CAN are adopted for realizing communication with superior control and BMS; the control signal is converted into a driving signal with certain power to drive the charging and discharging switch (K1) or the bypass switch (K2) to act.
In one embodiment, after the monitoring control unit receives the bypass command, the monitoring control unit sends out the bypass command, executes the process of converting the charging and discharging state into the bypass state, and quits the battery; and when the monitoring control unit receives a battery access command, the monitoring control unit sends the access command, executes the process of converting the bypass state into the charge-discharge state and accesses the battery.
Preferably, the main components of the flexible connection protection device are:
relays K1, K2, which adopt 100A magnetic latching relays;
diodes D1 and D2, power diodes of greater than 40A, 200V are used;
the monitoring control unit adopts a measurement control unit based on a digital processing chip.
In one embodiment, fig. 2 is a schematic diagram of a plurality of battery modules connected by using the flexible connection protection device for a single retired battery module of fig. 1. For example, there are 16 (2 redundant) retired battery modules with a dc voltage of 48V per port. 14 retired battery modules are connected in series through 16 flexible connecting devices, 2 redundant battery modules are bypassed, a direct-current voltage port of 0-672 can be formed, and then the direct-current voltage port is converted into AC380V commercial power through a DC/AC bidirectional converter. The bidirectional converter of DC 672V/AC380V is a conventional product in the industry market.
Generally speaking, adopt the retired battery module of flexonics protection, it includes: the retired battery modules and the master control device are connected in series by the flexible connecting devices, the master control device is used for collecting voltage, current and temperature information of the retired battery modules, centralized control of the single retired battery modules is achieved, overcurrent and overvoltage are avoided, and uniform charging is achieved.
When the master control device is configured, normal charging is started in a charging state, the master control device detects whether the voltage difference between the retired battery modules of the single low-voltage area is smaller than a set threshold value, if not, the master control device controls to start a uniform charging means of the lower voltage area, at the moment, the voltage of the retired battery modules is lower, the set uniform starting threshold value is larger, and the voltage value of the retired battery modules is rapidly charged to be higher so as to shorten the whole charging time;
if the result of the search is negative, starting a uniform means for charging the upper voltage area and then continuing charging until the result of the detection is positive, and further directly detecting whether the voltage of the single body of the retired battery module is larger than the overcharge threshold value, and if the result of the search is positive, finishing the charging of the retired battery module.
In embodiment 2, referring to fig. 2 again, before the start of charging (discharging), the battery cluster control and management unit (i.e., the master control device) selects n battery modules with smaller (larger) terminal voltages from the n + k battery modules to be used according to the dc bus voltage, and the other k battery modules exit the bypass. With such selection, the terminal voltages of the m battery clusters are made the same (within a set error range, for example, Δ U is 1.0V). Then, each battery cluster is sequentially connected to a direct current bus to start charging (discharging). Wherein n battery modules are the number necessary for establishing DC bus voltage, and k battery modules are redundant
Setting the rotation interval time to be delta T (for example, 10min), and after every delta T, withdrawing the battery module with the maximum (small) end voltage in charging (discharging), putting the battery module with the minimum (large) end voltage in k bypass states, and circulating the steps until each battery module is fully charged (discharged).
When the battery module is fully charged and needs to be charged by a small current, in order to save time, the voltage of a direct current bus can be increased, and meanwhile, the number of input modules is increased for each battery cluster. This speeds up the charging without increasing the charging power.
When the battery module discharges more and the terminal voltage drops more, in order to maintain the output power, the number of input modules can be increased in each battery cluster, the voltage of the direct-current bus is increased, and the output power is basically not influenced.
For heterogeneous batteries, because the terminal voltages of the battery modules are different, the battery cluster control management unit only needs to control the number of the battery modules to be put into the battery cluster, so that the terminal voltage of the battery cluster is matched with the voltage of the direct-current bus.
And (3) permanently quitting a certain battery module and reporting the battery module once the battery module is detected to be faulty or damaged.
And selecting the values of n and k.
The value of n is determined by the dc bus voltage and the terminal voltage of the battery module. If the dc bus voltage is 1000V and the terminal voltage of the battery module is nominally 48V, n is 1000/48 is 20.8, and 21 is obtained. The value of k is determined by the battery rest time and the alternate time. If the battery standing time is 30min and the alternate time is 15min, k is 30/15 is 2, and the minimum value of k is 2. Similarly, if the rotation interval time is 10min, k is 3. The larger the k value, the larger the number of strings, the larger the capacity of the battery cluster.
In the case of the example 3, the following examples are given,
battery module and estimation of single SOC and SOH
The battery architecture provides conditions and means for estimating the SOC and SOH of the battery module and the single battery by using the battery terminal voltage after standing. The SOC and SOH of the battery module and the single battery can be more accurately estimated by combining with other methods such as a charge accumulation method and the like. The terminal voltage of the battery after standing for 30min can basically reflect the state of charge of the battery and can be used for estimating SOC and SOH. In the operation process, the battery modules are put into and withdrawn in turn, and if the turn interval is 10min and the redundancy number is 3, the standing time of the batteries which are withdrawn from the bypass is 30 min. The greater the number of redundancies, the longer the battery module can stand.
The above embodiments are only for illustrating the invention and are not to be construed as limiting the invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention, therefore, all equivalent technical solutions also belong to the scope of the invention, and the scope of the invention is defined by the claims.
Claims (9)
1. The utility model provides an adopt retired battery module of flexonics protection which characterized in that includes: the system comprises a plurality of groups of retired battery modules and a master control device, wherein the retired battery modules and the master control device are connected in series through flexible connecting devices, the master control device collects voltage, current and temperature information of the plurality of groups of retired battery modules, and each retired battery module comprises a charge-discharge switch (K1), a charge diode (D1), a bypass switch (K2), a bypass diode (D2) and a monitoring control unit;
the charging and discharging switch (K1) and the bypass switch (K2) are mechanically or logically interlocked;
one end of the charge and discharge switch (K1) is connected with the "+" of the battery interface, and the other end of the charge and discharge switch is connected with the "+" of the charge and discharge interface, so that the charge and discharge of the battery module are realized;
one end of the bypass switch (K2) is connected with the "+" of the charge-discharge interface, and the other end of the bypass switch is connected with the "-" of the charge-discharge interface, so that the bypass of the battery module is realized;
the anode of the charging diode (D1) is connected with the "+" of the charging and discharging interface, and the cathode of the charging diode is connected with the "-" of the battery interface, so that the follow current during the action of the charging and discharging switch (K1) and the blocking during the bypass of the battery module are realized;
the cathode of the bypass diode (D2) is connected with the "+" of the charge-discharge interface, and the anode of the bypass diode is connected with the "-" of the charge-discharge interface, so that the follow current and the blocking of the battery module from the bypass state to the access state during the action of the bypass switch (K2) are realized; each detection control unit is connected with a master control device;
meanwhile, in a charging state, when normal charging is started, the master control device detects whether the voltage difference between the retired battery modules of the single cells in the low-voltage area is smaller than a set threshold value, and if the detection result is negative, the master control device controls to start a uniform charging means of the low-voltage area, at the moment, the voltage of the retired battery modules is lower, the set uniform starting threshold value is larger, so that the voltage value of the retired battery modules is rapidly charged to be higher, and the whole charging time is shortened;
if the result of the search is negative, starting a uniform means for charging the upper voltage area and then continuing charging until the result of the detection is positive, and further directly detecting whether the voltage of the single body of the retired battery module is larger than the overcharge threshold value, and if the result of the search is positive, finishing the charging of the retired battery module.
2. The retired battery module protected by flexible connection of claim 1, wherein the ① th port of the monitoring and control unit is connected to the voltage and temperature acquisition interface of the battery module, the ② th port is an external communication interface, and the ③ th port controls the actions of the charge/discharge switch (K1) and the bypass switch (K2);
the input of the monitoring control unit is the voltage and the temperature of the battery module;
the output of the monitoring control unit is control and power driving signals of a charging and discharging switch (K1) and a bypass switch (K2). The communication interface of the monitoring control unit is responsible for an external communication interface;
the monitoring control unit realizes the monitoring of the voltage and the temperature of the battery module, controls the actions of the charge and discharge switch (K1) and the bypass switch (K2) and is responsible for external communication.
3. The decommissioned battery module protected by flexible connection according to claim 1, wherein:
the charge and discharge switch (K1) is a magnetic latching relay;
the bypass switch (K2) is a magnetic latching relay;
the charging diode (D1) is a power diode;
the bypass diode (D2) is a power diode.
4. The decommissioned battery module protected by flexible connection according to claim 1, wherein:
the monitoring control unit is realized based on a digital circuit or an analog logic circuit.
5. The decommissioned battery module protected by flexible connection according to claim 1, wherein:
the monitoring control unit is realized based on a digital processing chip.
6. The decommissioned battery module protected by flexible connection according to claim 1, wherein: the flexible connection module of the battery module has the following working states:
and (3) charging and discharging states: the charging and discharging switch (K1) is closed, and other switches are all opened;
a bypass state: the bypass switch (K2) is closed and the other switches are open.
7. The decommissioned battery module protected by flexible connection according to claim 6, wherein: when the charge and discharge switch (K1) and the bypass switch (K2) act, the charging diode (D1) and the bypass diode (D2) have freewheeling and unidirectional blocking functions, so that the complete communication of the flexible connection module loop is ensured without the danger of the loop being opened.
8. The decommissioned battery module protected by flexible connection according to claim 7, wherein: when the monitoring control unit receives the bypass command, the monitoring control unit sends the bypass command, executes the process of switching from the charging and discharging state to the bypass state and quits the battery; and when the monitoring control unit receives a battery access command, the monitoring control unit sends the access command, executes the process of converting the bypass state into the charge-discharge state and accesses the battery.
9. A battery pack comprising a decommissioned battery module protected by flexible connection according to any of claims 1-8 and a DC/AC bi-directional converter, wherein the output of the decommissioned battery module combination is converted into commercial power by the DC/AC bi-directional converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010248018.9A CN111431232B (en) | 2020-03-31 | 2020-03-31 | Retired battery module adopting flexible connection protection |
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| CN112234818A (en) * | 2020-09-29 | 2021-01-15 | 晶科能源有限公司 | Converter and charging equipment |
| CN116388345A (en) * | 2023-06-01 | 2023-07-04 | 西安为光能源科技有限公司 | Battery PACK circuit system and control method |
| CN116505632A (en) * | 2023-06-30 | 2023-07-28 | 西安为光能源科技有限公司 | Battery charging and discharging circuit and control system and method |
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| CN116388345A (en) * | 2023-06-01 | 2023-07-04 | 西安为光能源科技有限公司 | Battery PACK circuit system and control method |
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| CN116505632A (en) * | 2023-06-30 | 2023-07-28 | 西安为光能源科技有限公司 | Battery charging and discharging circuit and control system and method |
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| CN111431232B (en) | 2024-04-26 |
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