CN220456483U - Direct-current side output circuit of battery stack and container energy storage system - Google Patents
Direct-current side output circuit of battery stack and container energy storage system Download PDFInfo
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- 238000012544 monitoring process Methods 0.000 description 6
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Abstract
The present disclosure proposes a direct current side output circuit of a battery stack and a container energy storage system, wherein the direct current side output circuit of the battery stack includes: and a confluence unit including: the first bus is respectively connected with the anodes of the battery clusters in the battery stack, and the second bus is respectively connected with the cathodes of the battery clusters in the battery stack; an output unit including: the first branch line is connected with the first bus, and the second branch line is connected with the second bus; a detection unit including: the detection end of the current detection module is arranged on the first branch line, and the detection end of the voltage detection module is arranged on the first branch line and the second branch line. In the direct-current side output circuit and the integrated energy storage system of the battery stack, the acquisition cost of the direct-current side output electric energy of the battery stack is effectively reduced, and the acquisition accuracy of the direct-current side output electric energy of the battery stack is improved.
Description
Technical Field
The disclosure relates to the field of energy storage technologies, and in particular relates to a direct-current side output circuit of a battery stack and a container energy storage system.
Background
Along with the continuous development of new energy, the demand for energy storage systems is more and more, especially container energy storage systems with characteristics of large electric quantity, centralized type, movable and the like, wherein the container energy storage systems need to monitor the output electric energy of the direct current side of the container energy storage systems in use, the current and the voltage of each battery cluster are respectively collected in the current mode, but because more battery clusters exist in the container energy storage systems, the collection cost of electric energy is higher, and larger errors are easy to occur when the whole output electric energy is calculated, so that the collection accuracy of electric energy is poor, and the use requirement is difficult to meet.
Disclosure of Invention
The present disclosure aims to solve, at least to some extent, one of the technical problems in the related art.
To this end, it is an object of the present disclosure to provide a direct current side output circuit of a battery stack and a container energy storage system.
To achieve the above object, a first aspect of the present disclosure provides a dc side output circuit of a battery stack, including: a confluence unit, the confluence unit comprising: the first bus bar is respectively connected with positive poles of a plurality of battery clusters in the battery stack, and the second bus bar is respectively connected with negative poles of a plurality of battery clusters in the battery stack; an output unit, the output unit comprising: a first branch line and a second branch line, wherein the first branch line is connected with the first bus bar, and the second branch line is connected with the second bus bar; a detection unit comprising: the current detection module and the voltage detection module, the detection end of the current detection module is arranged on the first branch line, and the detection end of the voltage detection module is arranged on the first branch line and the second branch line.
Optionally, the output unit further includes: an isolating switch, the isolating switch comprising: the first switch assembly is connected in series with the first branch line, and the second switch assembly is connected in series with the second branch line; the isolating switch is located at one end, far away from the converging unit, of the detecting unit.
Optionally, the first switch assembly includes: the first switch and the second switch are sequentially connected in series on the first branch line; the second switch assembly includes: the third switch and the fourth switch are sequentially connected in series on the second branch line; the first switch, the second switch, the third switch and the fourth switch are linked, and the first switch, the second switch, the third switch and the fourth switch are synchronously switched on and off.
Optionally, the output unit further includes: the positive pole of lightning protection device with first branch line links to each other, the negative pole of lightning protection device with the second branch line links to each other, the ground connection of lightning protection device, just the lightning protection device is located isolator keeps away from detecting element's one end.
Optionally, the output unit further includes: a first fuse connected in series between the positive pole of the lightning protection device and the first branch line; and the second fuse is connected in series between the negative electrode of the lightning protection device and the second branch line.
Optionally, the output unit further includes: and a third fuse connected in series between the first branch line and the first bus bar.
Optionally, the current detection module includes: the detection end of the Hall sensor is sleeved on the first branch line, and the output end of the Hall sensor outputs a current analog signal.
Optionally, the voltage detection module includes: the positive pole of the voltage sensor is connected with the first branch line, the negative pole of the voltage sensor is connected with the second branch line, and the output end of the voltage sensor outputs a voltage analog signal.
A second aspect of the present disclosure provides a container energy storage system comprising: at least one energy storage device, the energy storage device comprising: a cell stack and a direct current side output circuit of the cell stack as provided in the first aspect of the present disclosure; the electric energy processing unit, the electric current input of electric energy processing unit respectively with all in the energy storage device direct current side output circuit's current detection module output links to each other, the electric energy processing unit's voltage input respectively with all in the energy storage device direct current side output circuit's voltage detection module output links to each other.
Optionally, the at least one energy storage device includes: the output end of the voltage detection module in the first energy storage device is connected with the first voltage input end of the electric energy processing unit; the output end of the current detection module in the second energy storage device is connected with the second current input end of the electric energy processing unit, and the output end of the voltage detection module in the second energy storage device is connected with the second voltage input end of the electric energy processing unit.
The technical scheme provided by the disclosure can comprise the following beneficial effects:
the plurality of battery clusters in the battery stack respectively converge electric energy on a first bus and a second bus, and the first bus and the second bus intensively convey the electric energy on a first branch line and a second branch line, so that the electric energy output of the direct current side of the battery stack is realized; the current detection module detects the current on the first branch line, so that the current detection of the plurality of battery clusters is realized, the voltage detection module detects the voltage between the first branch line and the second branch line, so that the current detection of the plurality of battery clusters is realized, and therefore, the current detection module can calculate the current collection electric energy of the plurality of battery clusters by utilizing the detected current collection electric energy and the current collection voltage, and the monitoring requirement of the output electric energy of the direct current side is met; the current detection module detects the current after the plurality of battery clusters are converged, and the voltage detection module detects the voltage after the plurality of battery clusters are converged, so that the number of the current detection module and the number of the voltage detection module are greatly reduced, the acquisition cost of the output electric energy of the direct current side of the battery stack is effectively reduced, and the data size of the output electric energy of the direct current side of the battery stack is also greatly reduced along with the reduction of the number of the current detection module and the voltage detection module, so that the calculation error is effectively reduced, and the acquisition accuracy of the output electric energy of the direct current side of the battery stack is further improved.
Additional aspects and advantages of the disclosure will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the disclosure.
Drawings
The foregoing and/or additional aspects and advantages of the present disclosure will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a schematic circuit diagram of a DC side output circuit of a battery stack according to an embodiment of the present disclosure;
FIG. 2 is a schematic circuit diagram of a DC side output circuit of a battery stack according to an embodiment of the present disclosure;
FIG. 3 is a schematic circuit diagram of a container energy storage system according to an embodiment of the present disclosure;
FIG. 4 is a schematic circuit diagram of a container energy storage system according to an embodiment of the present disclosure;
as shown in the figure: 1. an energy storage device;
11. a stack, 111, a cluster;
12. a DC side output circuit;
121. a busbar unit 1211, a first busbar, 1212, a second busbar;
122. an output unit;
1221. a first leg 1222, a second leg;
1223. isolation switch, 12231, first switch, 12232, second switch, 12233, third switch, 12234, fourth switch;
1224. a lightning protection device 1225, a first fuse, 1226, a second fuse, 1227, a third fuse;
123. a detection unit;
1231. the current detection module is 12311 and the Hall sensor;
1232. a voltage detection module 12321 and a voltage sensor;
2. the device comprises an electric energy processing unit 3, a first energy storage device 4 and a second energy storage device.
Detailed Description
Embodiments of the present disclosure are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present disclosure and are not to be construed as limiting the present disclosure. On the contrary, the embodiments of the disclosure include all alternatives, modifications, and equivalents as may be included within the spirit and scope of the appended claims.
As shown in fig. 1 and 2, the embodiment of the disclosure proposes a dc side output circuit 12 of a battery stack 11, including a bus unit 121, an output unit 122 and a detection unit 123, where the bus unit 121 includes a first bus 1211 and a second bus 1212, the first bus 1211 is respectively connected to anodes of a plurality of battery clusters 111 in the battery stack 11, the second bus 1212 is respectively connected to cathodes of the plurality of battery clusters 111 in the battery stack 11, the output unit 122 includes a first branch line 1221 and a second branch line 1222, the first branch line 1221 is connected to the first bus 1211, the second branch line 1222 is connected to the second bus 1212, the detection unit 123 includes a current detection module 1231 and a voltage detection module 1232, a detection end of the current detection module 1231 is disposed on the first branch line 1221, and a detection end of the voltage detection module 1232 is disposed on the first branch line 1221 and the second branch line 1222.
As can be appreciated, the plurality of clusters 111 in the stack 11 sink electrical energy onto the first and second bus bars 1211 and 1212, respectively, the first and second bus bars 1211 and 1212 focus the electrical energy onto the first and second legs 1221 and 1222, thereby enabling a dc side electrical energy output of the stack 11; and, the current detection module 1231 detects the current on the first branch line 1221, thereby realizing the detection of the bus current of the plurality of battery clusters 111, and the voltage detection module 1232 detects the voltage between the first branch line 1221 and the second branch line 1222, thereby realizing the detection of the bus voltage of the plurality of battery clusters 111, and therefore, the bus electric energy of the plurality of battery clusters 111 can be calculated by using the detected bus current and bus voltage, and the monitoring requirement of the output electric energy of the direct current side is satisfied.
Wherein, because the current detection module 1231 detects the current after the multiple battery clusters 111 converge, the voltage detection module 1232 detects the voltage after the multiple battery clusters 111 converge, so that the number of the current detection module 1231 and the voltage detection module 1232 is greatly reduced, thereby effectively reducing the acquisition cost of the output electric energy of the direct current side of the battery stack 11, and the data size of the output electric energy of the direct current side of the battery stack 11 is greatly reduced as the number of the current detection module 1231 and the voltage detection module 1232 is reduced, thereby effectively reducing the calculation error and further improving the acquisition accuracy of the output electric energy of the direct current side of the battery stack 11.
It should be noted that, the stack 11 includes a plurality of battery clusters 111, and the battery clusters 111 include a plurality of cells connected in series and/or parallel, where the number of battery clusters 111 may be set according to actual needs, which is not limited thereto, and the number of battery clusters 111 may be 2, 3, 5, 6, 8, or the like, by way of example.
The first bus 1211 is used for the positive electrode confluence of the plurality of battery clusters 111, and a specific type of the first bus 1211 may be set according to actual needs, which is not limited thereto, and the first bus 1211 may be a positive electrode bus copper bar, for example.
The second bus bar 1212 is used for the negative electrode bus bars of the plurality of battery clusters 111, and the specific type of the second bus bar 1212 may be set according to actual needs, which is not limited thereto, and the second bus bar 1212 may be a negative electrode bus bar copper bar, for example.
The first branch line 1221 is used for outputting the positive current after the current is converged on the first busbar 1211, and the specific type of the first branch line 1221 may be set according to actual needs, which is not limited, and the first branch line 1221 may be a positive branch line copper bar, for example.
The second branch 1222 is used for outputting the cathode current after the second bus 1212 is converged, and the specific type of the second branch 1222 may be set according to actual needs, which is not limited thereto, and the second branch 1222 may be a cathode branch copper bar, for example.
The first branch 1221 and the second branch 1222 may be connected to a dc side input of a PCS (Power Conversion System, energy storage converter) to form a dc side output loop of the cell stack 11.
The current detection module 1231 is configured to detect the current on the first branch 1221, and the specific type of the current detection module 1231 can be set according to actual needs, which is not limited.
The voltage detection module 1232 is configured to detect the current on the first branch 1221, and the specific type of the voltage detection module 1232 may be set according to actual needs, which is not limited.
The dc side output circuit 12 of the battery stack 11 may be applied to a container energy storage system, or may be applied to other energy storage systems, without limitation.
As shown in fig. 2, in some embodiments, the output unit 122 further includes a isolation switch 1223, the isolation switch 1223 including a first switch 12231 component and a second switch 12232 component, the first switch 12231 component being connected in series on the first branch line 1221, the second switch 12232 component being connected in series on the second branch line 1222, wherein the isolation switch 1223 is located at an end of the detection unit 123 remote from the junction unit 121.
It will be appreciated that when the first switch 12231 assembly and the second switch 12232 assembly are both turned on, the output loop formed by the first branch 1221 and the second branch 1222 is turned on, so as to realize that the electric power output of the plurality of battery clusters 111 in the battery stack 11 is turned on, and when the first switch 12231 assembly and/or the second switch 12232 assembly is turned off, the output loop formed by the first branch 1221 and the second branch 1222 is turned off, so as to realize that the electric power output of the plurality of battery clusters 111 in the battery stack 11 is turned off, thereby realizing the on-off control of the electric power output of the battery stack 11 by using the cooperation of the first switch 12231 assembly and the second switch 12232 assembly, and ensuring that the electric power output of the battery stack 11 has higher flexibility.
Meanwhile, due to the isolation function of the isolation switch 1223, when the first switch 12231 component and/or the second switch 12232 component are/is disconnected, the output circuit formed by the first branch line 1221 and the second branch line 1222 has a reliable insulation gap, and when the first switch 12231 component and/or the second switch 12232 component are/is conducted, the output circuit formed by the first branch line 1221 and the second branch line 1222 has a reliable current carrying capacity, so that the direct current side output circuit of the battery stack 11 has higher reliability and safety.
It should be noted that the isolating switch 1223 is used for controlling on/off of the path, and provides a reliable insulation gap when opening and a reliable current carrying capability when closing, where the specific types of the first switch 12231 component and the second switch 12232 component may be set according to actual needs, which is not limited.
As shown in fig. 2, in some embodiments, the first switch 12231 assembly includes a first switch 12231 and a second switch 12232, the first switch 12231 and the second switch 12232 are sequentially connected in series on the first branch 1221, the second switch 12232 assembly includes a third switch 12233 and a fourth switch 12234, and the third switch 12233 and the fourth switch 12234 are sequentially connected in series on the second branch 1222, wherein the first switch 12231, the second switch 12232, the third switch 12233 and the fourth switch 12234 are linked, and the first switch 12231, the second switch 12232, the third switch 12233 and the fourth switch 12234 are synchronously turned on and off.
It will be appreciated that when both the first switch 12231 and the second switch 12232 are on, the path of the first leg 1221 is on, and when the first switch 12231 and/or the second switch 12232 are off, the path of the first leg 1221 is off; when the third switch 12233 and the fourth switch 12234 are both on, the path of the second branch 1222 is on, and when the third switch 12233 and/or the fourth switch 12234 are off, the path of the second branch 1222 is off.
The first switch 12231, the second switch 12232, the third switch 12233 and the fourth switch 12234 are linked, and the first switch 12231, the second switch 12232, the third switch 12233 and the fourth switch 12234 are synchronously turned on and off, so that when the first switch 12231, the second switch 12232, the third switch 12233 and the fourth switch 12234 are simultaneously turned on, an output loop formed by the first branch line 1221 and the second branch line 1222 is turned on, thereby realizing that the electric energy output of the plurality of battery clusters 111 in the battery stack 11 is turned on, and the first switch 12231, the second switch 12232, the third switch 12233 and the fourth switch 12234 are integrated to have reliable current carrying capacity after being matched, so that the stable output of the electric energy of the plurality of battery clusters 111 in the battery stack 11 is ensured; when the first switch 12231, the second switch 12232, the third switch 12233 and the fourth switch 12234 are simultaneously turned off, the output loop formed by the first branch line 1221 and the second branch line 1222 is turned off, so that the electric energy output of the plurality of battery clusters 111 in the battery stack 11 is turned off, and the first switch 12231, the second switch 12232, the third switch 12233 and the fourth switch 12234 are matched and integrally provided with reliable insulation gaps, so that the electric energy of the plurality of battery clusters 111 in the battery stack 11 is stably turned off.
Note that the specific types and linkage manners of the first switch 12231, the second switch 12232, the third switch 12233, and the fourth switch 12234 may be set as needed, which is not limited.
As shown in fig. 2, in some embodiments, the output unit 122 further includes a lightning protection device 1224, the positive electrode of the lightning protection device 1224 is connected to the first branch line 1221, the negative electrode of the lightning protection device 1224 is connected to the second branch line 1222, the ground of the lightning protection device 1224 is grounded, and the lightning protection device 1224 is located at an end of the isolating switch 1223 away from the detecting unit 123.
It will be appreciated that when the voltage between the first leg 1221 and the second leg 1222 is in the normal range, a high impedance is presented between the lightning protection device 1224 and ground to ensure normal power transfer between the first leg 1221 and the second leg 1222, and when the voltage between the first leg 1221 and the second leg 1222 is too high, a low impedance is presented between the lightning protection device 1224 and ground to enable excessive transient energy transfer from the first leg 1221 and the second leg 1222 to ground to effect protection of the dc side output loop of the stack 11.
It should be noted that, the lightning protection device 1224 is used for discharging the transient overvoltage in the circuit, and the specific type of the lightning protection device 1224 may be set according to the actual needs, which is not limited.
As shown in fig. 2, in some embodiments, the output unit 122 further includes a first fuse 1225 and a second fuse 1226, the first fuse 1225 being connected in series between the positive pole of the lightning protection device 1224 and the first branch 1221, the second fuse 1226 being connected in series between the negative pole of the lightning protection device 1224 and the second branch 1222.
It can be appreciated that, since the first fuse 1225 is connected in series between the positive pole of the lightning protection device 1224 and the first branch line 1221, and the second fuse 1226 is connected in series between the negative pole of the lightning protection device 1224 and the second branch line 1222, when the current on the first branch line 1221 and the second branch line 1222 is too high, the first fuse 1225 and the second fuse 1226 can disconnect the paths of the first branch line 1221 and the second branch line 1222, thereby implementing double protection of the first branch line 1221 and the second branch line 1222 in cooperation with the lightning protection device 1224, and further ensuring stable operation of the dc side output circuit of the cell stack 11.
Note that, when the current exceeds a predetermined value, the first fuse 1225 and the second fuse 1226 are both fuses, and the fuses are an electric appliance that fuses a melt by using heat generated by the fuses to open a circuit, and the specific types of the first fuse 1225 and the second fuse 1226 may be set according to actual needs, which is not limited, and the specifications of the first fuse 1225 and the second fuse 1226 may be 1500V/50A, for example.
When the voltage between the first branch line 1221 and the second branch line 1222 is too high, the current on the first branch line 1221 and the second branch line 1222 is too high, and the first fuse 1225 and the second fuse 1226 are opened.
As shown in fig. 1 and 2, in some embodiments, the output unit 122 further includes a third fuse 1227, the third fuse 1227 being connected in series between the first branch 1221 and the first bus 1211.
It will be appreciated that since the third fuse 1227 is connected in series between the first branch 1221 and the first busbar 1211, the third fuse 1227 is able to disconnect the path between the first branch 1221 and the first busbar 1211 when the current on the first branch 1221 and the first busbar 1211 is too high, thereby protecting the first branch 1221 and the first busbar 1211 and ensuring stable operation of the dc side output circuit of the cell stack 11.
Note that, the third fuse 1227 is also a fuse, and a specific type of the third fuse 1227 may be set according to actual needs, which is not limited.
As shown in fig. 1 and 2, in some embodiments, the current detection module 1231 includes a hall sensor 12311, where a detection end of the hall sensor 12311 is sleeved on the first branch 1221, and an output end of the hall sensor 12311 outputs a current analog signal.
It can be appreciated that, since the detecting end of the hall sensor 12311 is sleeved on the first branch line 1221, the current change on the first branch line 1221 can cause the magnetic field change of the hall sensor 12311, so that the hall sensor 12311 outputs a corresponding current analog signal according to the changed magnetic field, current detection is realized, and further, the detected current is used to calculate the electric energy, so as to meet the monitoring requirement of the output electric energy of the direct current side.
It should be noted that the hall sensor 12311 is a magnetic field sensor manufactured according to the hall effect, and the specific type of the hall sensor 12311 may be set according to actual needs, which is not limited.
As shown in fig. 1 and 2, in some embodiments, the voltage detection module 1232 includes a voltage sensor 12321, where a positive electrode of the voltage sensor 12321 is connected to the first branch 1221, a negative electrode of the voltage sensor 12321 is connected to the second branch 1222, and an output of the voltage sensor 12321 outputs a voltage analog signal.
It can be appreciated that, since the positive electrode of the voltage sensor 12321 is connected to the first branch line 1221 and the negative electrode of the voltage sensor 12321 is connected to the second branch line 1222, the voltage sensor 12321 can detect the voltage change between the first branch line 1221 and the second branch line 1222 and output a corresponding voltage analog signal, thereby realizing voltage detection, further calculating the electric energy by using the detected voltage, and meeting the monitoring requirement of the output electric energy of the dc side.
It should be noted that, the voltage sensor 12321 refers to a sensor that can sense the measured voltage and convert the sensed voltage into an available output signal, and the specific type of the voltage sensor 12321 may be set according to actual needs, which is not limited thereto.
As shown in fig. 3 and fig. 4, the embodiment of the disclosure further provides a container energy storage system, which includes at least one energy storage device 1 and an electric energy processing unit 2, where the energy storage device 1 includes a battery stack 11 and a dc side output circuit 12 of the battery stack 11 according to the embodiment of the disclosure, current input ends of the electric energy processing unit 2 are respectively connected to output ends of the current detection modules 1231 of the dc side output circuits 12 in all the energy storage devices 1, and voltage input ends of the electric energy processing unit 2 are respectively connected to output ends of the voltage detection modules 1232 of the dc side output circuits 12 in all the energy storage devices 1.
As can be appreciated, the plurality of battery clusters 111 in the stack 11 sink electrical energy onto the first and second buses 1211 and 1212, respectively, the first and second buses 1211 and 1212 focus the electrical energy onto the first and second legs 1221 and 1222, thereby enabling a dc side electrical energy output of the container energy storage system; and, the current detection module 1231 detects the current on the first branch line 1221, thereby realizing the detection of the current of the multiple battery clusters 111, and the voltage detection module 1232 detects the voltage between the first branch line 1221 and the second branch line 1222, thereby realizing the detection of the voltage of the multiple battery clusters 111, and therefore, the current and the voltage of the detected current can be used to calculate the current of the multiple battery clusters 111, and the monitoring requirement of the output electric energy of the direct current side in the container energy storage system is satisfied.
The current detection module 1231 detects the current after the plurality of battery clusters 111 converge, and the voltage detection module 1232 detects the voltage after the plurality of battery clusters 111 converge, so that the number of the current detection module 1231 and the number of the voltage detection module 1232 are greatly reduced, thereby effectively reducing the acquisition cost of the output electric energy of the direct current side in the container energy storage system, and the data size of the output electric energy of the calculated direct current side is greatly reduced along with the reduction of the number of the current detection module 1231 and the voltage detection module 1232, thereby effectively reducing the calculation error, and further improving the acquisition accuracy of the output electric energy of the direct current side of the container energy storage system.
Meanwhile, the current input ends of the electric energy processing units 2 are respectively connected with the output ends of the current detection modules 1231 of the direct current side output circuits 12 in all the energy storage devices 1, and the voltage input ends of the electric energy processing units 2 are respectively connected with the output ends of the voltage detection modules 1232 of the direct current side output circuits 12 in all the energy storage devices 1, so that at least one energy storage device 1 can share one electric energy processing unit 2 to collect electric energy, and the collection cost of the direct current side output electric energy is further reduced.
It should be noted that the specific number of the energy storage devices 1 may be set according to actual needs, which is not limited to this, and when the number of the battery clusters 111 is twelve, for example, twelve battery clusters 111 may be divided into two battery stacks 11, that is, each battery stack 11 has six battery clusters 111, that is, the energy storage devices 1 are provided in two, each energy storage device 1 has six battery clusters 111 and one dc side output circuit 12.
The specific type of the power processing unit 2 may be set according to actual needs, which is not limited thereto, and the power processing unit 2 may be a dc power meter, which may be controlled by a BMS (Energy Management System ) or the like, for example.
As shown in fig. 4, in some embodiments, the at least one energy storage device 1 includes a first energy storage device 3 and a second energy storage device 4, an output end of the current detection module 1231 in the first energy storage device 3 is connected to a first current input end of the electric energy processing unit 2, an output end of the voltage detection module 1232 in the first energy storage device 3 is connected to a first voltage input end of the electric energy processing unit 2, an output end of the current detection module 1231 in the second energy storage device 4 is connected to a second current input end of the electric energy processing unit 2, and an output end of the voltage detection module 1232 in the second energy storage device 4 is connected to a second voltage input end of the electric energy processing unit 2.
It can be appreciated that the current detection module 1231 of the first energy storage device 3 detects the current on the corresponding first branch line 1221 and sends a first current analog signal to the first current input end of the electric energy processing unit 2, and the voltage detection module 1232 of the first energy storage device 3 detects the voltage between the corresponding first branch line 1221 and the second branch line 1222 and sends a first voltage analog signal to the first voltage input end of the electric energy processing unit 2; the current detection module 1231 of the second energy storage device 4 detects the current on the corresponding first branch line 1221 and sends a second current analog signal to the second current input end of the electric energy processing unit 2, and the voltage detection module 1232 of the second energy storage device 4 detects the voltage between the corresponding first branch line 1221 and the second branch line 1222 and sends a second voltage analog signal to the second voltage input end of the electric energy processing unit 2; thus, the electric energy processing unit 2 calculates the output electric energy of the first energy storage device 3 on the direct current side according to the first current analog signal and the first voltage analog signal, and calculates the output electric energy of the second energy storage device 4 on the direct current side according to the second current analog signal and the second voltage analog signal, thereby realizing the monitoring of the output electric energy of the first energy storage device 3 and the second energy storage device 4 on the direct current side.
It should be noted that, the power supply modes of the current detection module 1231 and the voltage detection module 1232 in the first energy storage device 3 and the current detection module 1231 and the voltage detection module 1232 in the second energy storage device 4 may be set according to actual needs, which is not limited to this, and the power supply of the current detection module 1231 and the voltage detection module 1232 in the first energy storage device 3 and the current detection module 1231 and the voltage detection module 1232 in the second energy storage device 4 may be from an external power source, and if the electric energy processing unit 2 has a larger electric energy output capability, the power supply of the current detection module 1231 and the voltage detection module 1232 in the first energy storage device 3 and the current detection module 1231 and the voltage detection module 1232 in the second energy storage device 4 may also be from the electric energy processing unit 2.
In the description of the present disclosure, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Furthermore, in the description of the present disclosure, unless otherwise indicated, the meaning of "a plurality" is two or more.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and further implementations are included within the scope of the preferred embodiment of the present disclosure in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present disclosure.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present disclosure have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the present disclosure, and that variations, modifications, alternatives, and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the present disclosure.
Claims (10)
1. A direct current side output circuit of a battery stack, comprising:
a confluence unit, the confluence unit comprising: the first bus bar is respectively connected with positive poles of a plurality of battery clusters in the battery stack, and the second bus bar is respectively connected with negative poles of a plurality of battery clusters in the battery stack;
an output unit, the output unit comprising: a first branch line and a second branch line, wherein the first branch line is connected with the first bus bar, and the second branch line is connected with the second bus bar;
a detection unit comprising: the current detection module and the voltage detection module, the detection end of the current detection module is arranged on the first branch line, and the detection end of the voltage detection module is arranged on the first branch line and the second branch line.
2. The direct-current side output circuit of the battery stack according to claim 1, wherein the output unit further comprises:
an isolating switch, the isolating switch comprising: the first switch assembly is connected in series with the first branch line, and the second switch assembly is connected in series with the second branch line;
the isolating switch is located at one end, far away from the converging unit, of the detecting unit.
3. The direct-current side output circuit of a battery stack according to claim 2, wherein,
the first switch assembly includes: the first switch and the second switch are sequentially connected in series on the first branch line;
the second switch assembly includes: the third switch and the fourth switch are sequentially connected in series on the second branch line;
the first switch, the second switch, the third switch and the fourth switch are linked, and the first switch, the second switch, the third switch and the fourth switch are synchronously switched on and off.
4. The direct-current side output circuit of the battery stack according to claim 2, wherein the output unit further comprises:
the positive pole of lightning protection device with first branch line links to each other, the negative pole of lightning protection device with the second branch line links to each other, the ground connection of lightning protection device, just the lightning protection device is located isolator keeps away from detecting element's one end.
5. The direct current side output circuit of the battery stack according to claim 4, wherein the output unit further comprises:
a first fuse connected in series between the positive pole of the lightning protection device and the first branch line;
and the second fuse is connected in series between the negative electrode of the lightning protection device and the second branch line.
6. The direct-current side output circuit of the battery stack according to claim 1, wherein the output unit further comprises:
and a third fuse connected in series between the first branch line and the first bus bar.
7. The direct current side output circuit of the battery stack according to claim 1, wherein the current detection module includes:
the detection end of the Hall sensor is sleeved on the first branch line, and the output end of the Hall sensor outputs a current analog signal.
8. The direct current side output circuit of the battery stack according to claim 1, wherein the voltage detection module comprises:
the positive pole of the voltage sensor is connected with the first branch line, the negative pole of the voltage sensor is connected with the second branch line, and the output end of the voltage sensor outputs a voltage analog signal.
9. A container energy storage system, comprising:
at least one energy storage device, the energy storage device comprising: a cell stack and a direct current side output circuit of the cell stack according to any one of claims 1 to 8;
the electric energy processing unit, the electric current input of electric energy processing unit respectively with all in the energy storage device direct current side output circuit's current detection module output links to each other, the electric energy processing unit's voltage input respectively with all in the energy storage device direct current side output circuit's voltage detection module output links to each other.
10. The container energy storage system of claim 9, wherein said at least one energy storage device comprises:
the output end of the voltage detection module in the first energy storage device is connected with the first voltage input end of the electric energy processing unit;
the output end of the current detection module in the second energy storage device is connected with the second current input end of the electric energy processing unit, and the output end of the voltage detection module in the second energy storage device is connected with the second voltage input end of the electric energy processing unit.
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