CN-224218120-U - Energy storage device

CN224218120UCN 224218120 UCN224218120 UCN 224218120UCN-224218120-U

Abstract

The utility model provides an energy storage device which comprises a plurality of battery packs and a plurality of transmission circuits which are correspondingly arranged, wherein each transmission circuit is provided with a voltage conversion module, the battery packs are respectively and electrically connected with a direct current bus through the corresponding voltage conversion modules, a shunt switch is arranged between the transmission circuits, when one transmission circuit is opened, the shunt switch is closed, direct current output by the battery packs on the other transmission circuit is shunted through the shunt switch, one path of direct current flows through the voltage conversion modules on the original transmission circuit to the direct current bus, the other path of direct current flows through the closed shunt switch to the direct current bus through the voltage conversion modules on the opened transmission circuits, and alternating current is output through inversion of a DC/AC module. According to the technical scheme, the power output of the battery pack is split and output to the voltage conversion modules through the split switch to carry out power sharing, each voltage conversion module works with low power, the heating value of the voltage conversion module is reduced, and the temperature rise of a parallel operation circuit of the battery pack is reduced.

Inventors

LI BOCAI

Assignees

宁波伯宝能源科技有限公司

Dates

Publication Date: 20260508
Application Date: 20250118
Priority Date: 20240119

Claims (15)

1. An energy storage device, comprising: a plurality of battery packs adapted to output direct current; The connecting ports are arranged in one-to-one correspondence with the battery packs, are suitable for mechanically and electrically connecting the battery packs and are detachably connected with the battery packs; The DC/AC module is electrically connected with the direct current bus and is suitable for inverting the direct current converged and output by the direct current bus to output alternating current; The battery pack is suitable for supplying power to a first power device through a battery pack parallel circuit and the DC/AC module when any battery pack is connected to the connection port, is also suitable for supplying power to a second power device when any battery pack is detached from the connection port, and comprises the following components: A plurality of transmission circuits arranged in one-to-one correspondence with the plurality of battery packs; each transmission circuit is configured with a voltage conversion module; The battery packs are respectively and electrically connected with the direct current buses through the voltage conversion modules corresponding to the battery packs, And when one transmission circuit is opened, one shunt switch connected with the opened transmission circuit is closed, the direct current output by the battery pack on the other transmission circuit connected with the closed shunt switch is shunted by the closed shunt switch, one path of direct current flows through the voltage conversion module on the original transmission circuit to the direct current bus, and the other path of direct current flows through the voltage conversion module on the opened transmission circuit to the direct current bus.
2. The energy storage device as defined in claim 1, wherein the output of the corresponding battery pack on a single one of said transmission circuits is adapted to be shunted by said shunt switch being closed to meet the maximum power output of the multiple transmission circuits or the maximum power output of the battery pack itself.
3. The energy storage device of claim 1 or 2, further comprising a micro-control unit adapted to control the shunt switch to selectively open or close.
4. The energy storage device of claim 3, wherein the shunt switch is a normally open switch.
5. The energy storage device of claim 4, wherein said shunt switch remains open when said transmission circuits are all on.
6. The energy storage device of claim 1, wherein said voltage conversion module on each of said transmission circuits is adapted to output a consistent voltage or a voltage differing by less than 0.1V.
7. The energy storage device of claim 1, further comprising a power switch disposed between the battery pack and the voltage conversion module.
8. The energy storage device as defined in claim 7, wherein the shunt switch and the power switch are controlled by the micro-control unit to selectively open or close, respectively.
9. The energy storage device as defined in claim 8, wherein said micro-control unit controls said power switch to be turned off when said battery pack is not connected to said transmission circuit or when said battery pack discharge cutoff voltage is below a preset threshold.
10. The energy storage device as claimed in claim 1, 7, 8 or 9, wherein the battery pack includes a built-in discharge switch and a BMS protection board which controls the discharge switch to be turned off when a discharge cutoff voltage of the battery pack is lower than a preset threshold.
11. The energy storage device of claim 1, wherein the voltage conversion module is a DC/DC module or a bi-directional DC/DC module.
12. An energy storage device, comprising: a plurality of battery packs adapted to output direct current; The connecting ports are arranged in one-to-one correspondence with the battery packs, are suitable for mechanically and electrically connecting the battery packs and are detachably connected with the battery packs; The DC/AC module is electrically connected with the direct current bus and is suitable for inverting the direct current converged and output by the direct current bus to output alternating current; The battery pack is suitable for supplying power to a first power device through a battery pack parallel circuit and the DC/AC module when any battery pack is connected to the connection port, is also suitable for supplying power to a second power device when any battery pack is detached from the connection port, and comprises the following components: A plurality of transmission circuits arranged in one-to-one correspondence with the plurality of battery packs; each transmission circuit is configured with a voltage conversion module; The battery packs are respectively and electrically connected with the direct current buses through the voltage conversion modules corresponding to the battery packs; a shunt switch is also arranged between the transmission circuits, wherein, The battery pack parallel circuit comprises at least a first output mode and a second output mode: When each transmission circuit is conducted in the first output mode, the shunt switch is disconnected, and the corresponding battery pack on each transmission circuit is electrically connected with the direct current bus through the corresponding voltage conversion module; When a certain transmission circuit is opened, one shunt switch connected with the opened transmission circuit is closed, direct current output by the battery pack on the other transmission circuit is shunted by the closed shunt switch, one path of direct current flows through the voltage conversion module on the original transmission circuit to the direct current bus, and the other path of direct current flows through the voltage conversion module on the opened transmission circuit to the direct current bus.
13. An energy storage device, comprising: n battery packs adapted to output direct current, N >2, respectively; The connecting ports are arranged in one-to-one correspondence with the battery packs, are suitable for mechanically and electrically connecting the battery packs and are detachably connected with the battery packs; The DC/AC module is electrically connected with the direct current bus and is suitable for inverting the direct current converged and output by the direct current bus to output alternating current; The battery pack is suitable for supplying power to a first power device through a battery pack parallel circuit and the DC/AC module when any battery pack is connected to the connection port, is also suitable for supplying power to a second power device when any battery pack is detached from the connection port, and comprises the following components: the transmission circuits are arranged in one-to-one correspondence with the battery packs; each transmission circuit is configured with a voltage conversion module; The battery packs are respectively and electrically connected with the direct current buses through the voltage conversion modules corresponding to the battery packs, Each of the transmission circuits is configured with a connection node between an output of the battery pack and an input of the voltage conversion module, A shunt switch is arranged between the connecting nodes, when one transmission circuit is disconnected, one of the shunt switches on two sides of the connecting node on the disconnected transmission circuit is controlled to be disconnected by a preset control logic, the other shunt switch is closed, and the other shunt switches are disconnected; And one transmission circuit is communicated with the closed shunt switch, the direct current output by the corresponding battery pack is shunted by the closed shunt switch, one path of direct current flows through the voltage conversion module on the original transmission circuit to the direct current bus, and the other path of direct current flows through the voltage conversion module on the opened transmission circuit to the direct current bus.
14. The energy storage device of claim 13, wherein when only one of the transmission circuits is detected to be on, the shunt switches on both sides of the connection node on the transmission circuit which is controlled to be on are all closed, the direct current output by the corresponding battery pack is shunted by the closed shunt switches, one path of direct current flows through the voltage conversion module on the original transmission circuit to the direct current bus, and the other two paths of the direct current flows through the voltage conversion module on the opened transmission circuit to the direct current bus.
15. An energy storage device, comprising: a plurality of battery packs adapted to output direct current; The connecting ports are arranged in one-to-one correspondence with the battery packs, are suitable for mechanically and electrically connecting the battery packs and are detachably connected with the battery packs; The DC/AC module is electrically connected with the direct current bus and is suitable for inverting the direct current converged and output by the direct current bus to output alternating current; The battery pack is suitable for supplying power to a first power device through a battery pack parallel circuit and the DC/AC module when any battery pack is connected to the connection port, is also suitable for supplying power to a second power device when any battery pack is detached from the connection port, and comprises the following components: A plurality of transmission circuits arranged in one-to-one correspondence with the plurality of battery packs; each transmission circuit is configured with a voltage conversion module; The battery packs are respectively and electrically connected with the direct current buses through the voltage conversion modules corresponding to the battery packs, A first node is configured between the output of the battery pack and the input of the voltage conversion module, and the first node is connected with a first shunt switch and a second shunt switch; The other end of the first shunt switch is connected to a first transmission circuit; the other end of the second shunt switch is connected to a second transmission circuit; When the transmission circuit provided with the first node is detected to be opened, one of the first shunt switch and the second shunt switch is controlled to be opened by a preset control logic, the other one of the first shunt switch and the second shunt switch is closed, direct current output by the battery pack on the first transmission circuit or the second transmission circuit is shunted by the closed shunt switch, one path of direct current flows through the voltage conversion module on the original transmission circuit to the direct current bus, and the other path of direct current flows through the closed shunt switch to the direct current bus.

Description

Energy storage device Technical Field The present utility model relates to an energy storage device. Background The prior art CN102122826A (application day: 2011-01-17; publication day: 2011-07-13) discloses a high-capacity storage battery energy storage bidirectional converter which supports multi-branch DC/DC module unit access, each storage battery branch gathers direct current energy to a direct current bus, and then the storage battery branch is connected with an alternating current power grid through a later-stage DC/AC converter or independently operates in a load mode. Therefore, the characteristic of wide-range change of the voltage of the battery pack terminal can be considered, the two-stage (DC/DC+DC/AC) multi-group access structure is adopted, the capacity of a single-group storage battery branch is reduced, the number of the battery series-parallel connection is reduced, and the problems of circulation and current sharing of the battery series-parallel connection are solved. However, the above solution has the technical problems of high cost and large heat productivity, and needs to be improved. Disclosure of utility model The present utility model is directed to solving the above-mentioned technical problems, and provides an energy storage device. The utility model provides an energy storage device, which comprises: a plurality of battery packs adapted to output direct current; The connecting ports are arranged in one-to-one correspondence with the battery packs, are suitable for mechanically and electrically connecting the battery packs and are detachably connected with the battery packs; The DC/AC module is electrically connected with the direct current bus and is suitable for inverting the direct current converged and output by the direct current bus to output alternating current; The battery pack is suitable for supplying power to a first power device through a battery pack parallel circuit and the DC/AC module when any battery pack is connected to the connection port, is also suitable for supplying power to a second power device when any battery pack is detached from the connection port, and comprises the following components: A plurality of transmission circuits arranged in one-to-one correspondence with the plurality of battery packs; each transmission circuit is configured with a voltage conversion module; The battery packs are respectively and electrically connected with the direct current buses through the voltage conversion modules corresponding to the battery packs, And when one transmission circuit is disconnected, one shunt switch connected with the disconnected transmission circuit is closed, the direct current output by the battery pack on the other transmission circuit connected with the closed shunt switch is shunted by the closed shunt switch, one path of direct current flows through the voltage conversion module on the original transmission circuit to a direct current bus, and the other path of direct current flows through the voltage conversion module on the disconnected transmission circuit to the direct current bus. Further, the output of the corresponding battery pack on a single transmission circuit is suitable for being shunted by the closed shunt switch to meet the maximum power output of the transmission circuit or the maximum power output of the battery pack. Further, a micro-control unit is also included, which is adapted to control the shunt switch to be selectively opened or closed. Further, the shunt switch is a normally open switch. Further, the shunt switch remains open when both of the transmission circuits are on. Further, the voltage conversion module on each of the transmission circuits is adapted to output a consistent voltage or a voltage differing by less than 0.1V. Further, the battery pack also comprises a power switch, wherein the power switch is arranged between the battery pack and the voltage conversion module. Further, the shunt switch and the power switch are controlled by the micro control unit to be selectively opened or closed respectively. Further, when the battery pack is not connected to the transmission circuit or when the discharge cut-off voltage of the battery pack is lower than a preset threshold value, the micro control unit controls the power switch to be turned off. Further, the battery pack includes a built-in discharge switch and a BMS protection plate, and when the discharge cutoff voltage of the battery pack is lower than a preset threshold value, the BMS protection plate controls the discharge switch to be turned off. Further, the voltage conversion module is a DC/DC module or a bidirectional DC/DC module. The present utility model provides yet another energy storage device comprising: a plurality of battery packs adapted to output direct current; The connecting ports are arranged in one-to-one correspondence with the battery packs, are suitable for mechanically and electrically connecting the battery packs and are detachabl