CN115483512B

CN115483512B - Energy storage device

Info

Publication number: CN115483512B
Application number: CN202211261079.4A
Authority: CN
Inventors: 黄英雄
Original assignee: Xiamen Hithium Energy Storage Technology Co Ltd
Current assignee: Xiamen Hithium Energy Storage Technology Co Ltd
Priority date: 2022-10-14
Filing date: 2022-10-14
Publication date: 2023-09-08
Anticipated expiration: 2042-10-14
Also published as: CN115483512A

Abstract

The application provides an energy storage device. The energy storage device includes: a power circuit, a battery cluster, a back plate, a connecting piece and an expansion body. The battery cluster comprises a battery module, the battery module comprises a battery module body and a module connector, and the module connector is electrically connected with the battery module body. The connecting piece comprises a main connecting part and a main clamping part, and the main connecting part is electrically connected with the main clamping part. The expansion body is arranged on the surface of the backboard, and the volume of the expansion body is increased when the expansion body is heated. The battery cluster is arranged side by side with the backboard and is opposite to the expansion body, the module connecting piece is positioned between the backboard and the battery module body, the main connecting part is fixedly connected with the backboard and is electrically connected with the power circuit through the backboard, and the main clamping part clamps the module plug-in piece and is electrically connected with the module plug-in piece. When the expansion body expands due to heating, the battery cluster is pushed away from the back plate, and the battery cluster is disconnected from the connecting piece to disconnect the electric connection between the battery cluster and the power circuit. The energy storage device provided by the application can solve the technical problem that the energy storage device in the prior art is not timely in fire extinguishing.

Description

Energy storage device

Technical Field

The application relates to the technical field of energy equipment, in particular to an energy storage device.

Background

The energy storage device is a high-integration energy storage device and mainly comprises a battery cluster and a bus cabinet. The fire-fighting status of the container is judged by the fire-fighting host according to the received sensor signal, the signal is output to the battery management system, and then the battery management system turns off the main power switch and releases the fire-fighting gas to realize fire-fighting. However, when the battery management system fails or the communication between the battery management system and the fire-fighting host fails, the power supply cannot be disconnected in time to achieve the aim of fire extinguishment, so that the battery in the energy storage device is damaged, and even a safety accident is caused.

Disclosure of Invention

The application provides an energy storage device, which aims to solve the technical problem that the energy storage device in the prior art is not timely in fire extinguishing.

In order to solve the above problems, the present application provides an energy storage device, comprising: a power circuit, a battery cluster, a back plate, a module connector and an expansion body. The battery cluster comprises a battery module, wherein the battery module comprises a battery module body and a module plug connector, and the module plug connector is electrically connected with the battery module body. The module connecting piece comprises a main connecting part and a main clamping part, wherein the main connecting part is electrically connected with the main clamping part. The expansion body is arranged on the surface of the backboard, and the volume of the expansion body becomes large when the expansion body is heated. The battery cluster and the backboard are arranged side by side and are opposite to the expansion body, the module connecting piece is located between the backboard and the battery module body, the main connecting portion is fixedly connected with the backboard and is electrically connected with the power circuit through the backboard, and the main clamping portion clamps the module plug-in connector and is electrically connected with the module plug-in connector. When the expansion body is heated and expanded, the battery cluster is pushed away from the back plate, and the battery cluster is disconnected from the module connecting piece so as to disconnect the electric connection between the battery cluster and the power supply circuit.

In a possible embodiment, the expansion body is a thermal expansion coating coated on the surface of the back plate by using a thermal expansion material or an expansion alloy arranged on the surface of the back plate.

In a possible implementation manner, the battery cluster comprises a castor, wherein the castor is fixed at the bottom end of the battery cluster, and the castor can drive the battery cluster to move when rolling.

In one possible embodiment, the battery pack further includes a high voltage case stacked in a vertical direction and electrically connected with the battery module.

In one possible embodiment, the high-voltage cartridge comprises a high-voltage cartridge body and a high-voltage plug. The high-voltage plug connector comprises a high-voltage positive plug component and a high-voltage negative plug component which are fixedly connected and electrically connected, and the high-voltage positive plug component and the high-voltage negative plug component are arranged at intervals along the vertical direction. The module plug connector comprises a module positive plug component and a module negative plug component, wherein the module positive plug component and the module negative plug component are arranged at intervals along the vertical direction. The module positive plug-in component, the module negative plug-in component, the high-voltage positive plug-in component and the high-voltage negative plug-in component are all located on one side of the battery cluster, the module negative plug-in component and the high-voltage positive plug-in component are adjacently arranged in the vertical direction, and the high-voltage box is connected with the battery module in series.

In one possible embodiment, the energy storage device further includes a high voltage box connector, the high voltage box connector includes a secondary connection portion and a secondary clamping portion, and the secondary connection portion is electrically connected with the secondary clamping portion. The module connecting pieces and the high-voltage box connecting pieces are two, and the main connecting parts of the module connecting pieces and the auxiliary connecting parts of the high-voltage box connecting pieces are fixedly connected with the backboard. One module connecting piece and one high-voltage box connecting piece are adjacently arranged and electrically connected, the main clamping part of the module connecting piece clamps and electrically connects with the module negative plug-in component, and the auxiliary clamping part of the high-voltage box connecting piece clamps and electrically connects with the high-voltage positive plug-in component. The main connecting part of the other module connecting piece is electrically connected with the power circuit, the main clamping part is clamped and electrically connected with the positive module plugging component, the auxiliary connecting part of the other high-voltage box connecting piece is electrically connected with the power circuit, and the auxiliary clamping part is clamped and electrically connected with the negative high-voltage plugging component.

In one possible embodiment, the plurality of battery modules are stacked in the vertical direction and connected in series.

In one possible embodiment, each battery module is provided with one module positive plug-in component and one module negative plug-in component, and the module positive plug-in components of two adjacent battery modules are arranged adjacent to the module negative plug-in components. Two module connecting pieces are arranged between every two adjacent battery modules, the main connecting parts of the two module connecting pieces are electrically connected, the main clamping part of one module connecting piece is clamped and electrically connected with the adjacent two module positive plug-in components and the module positive plug-in components in the module negative plug-in components, and the main clamping part of the other module connecting piece is clamped and electrically connected with the adjacent two module positive plug-in components and the module negative plug-in components in the module negative plug-in components.

In one possible embodiment, the energy storage device further includes a plurality of module copper bars, and the module copper bars are fixed on the surface of the back plate. The main connection parts of the two module connection members disposed between the adjacent two battery modules are electrically connected through the module copper bars disposed between the adjacent two battery modules.

In a possible implementation manner, the energy storage device further comprises two high-voltage copper bars, and the two high-voltage copper bars are fixed on the surface of the backboard; the main connecting part of the module connecting piece is electrically connected with the auxiliary connecting part of the high-voltage box connecting piece clamped in the high-voltage positive plug-in component through one of the high-voltage copper bars, and the auxiliary connecting part of the high-voltage box connecting piece clamped in the high-voltage negative plug-in component is electrically connected with the power circuit through the other high-voltage copper bar.

In one possible embodiment, the energy storage device further comprises a sensor, a fire-fighting host and a battery management system, wherein the sensor is electrically connected with the fire-fighting host, the fire-fighting host is electrically connected with the battery management system, and the battery management system is electrically connected with the power circuit. The fire control system comprises a sensor, a fire control host and an energy storage device, wherein the sensor is used for detecting the state of the battery cluster and generating a detection signal, and the fire control host is used for receiving the detection signal generated by the sensor and judging the fire control state of the energy storage device according to the signal; when the fire-fighting host judges that the energy storage device is in a fire-fighting state, the fire-fighting host outputs an indication signal indicating that the energy storage device is in the fire-fighting state to the battery management system, so that the battery management system disconnects a power supply circuit, and the power supply circuit is disconnected from the battery cluster.

In a possible implementation manner, the energy storage device further comprises a gas release device, wherein the gas release device is electrically connected with the battery management system and is used for releasing fire extinguishing gas, and the battery management system is further used for controlling the gas release device to release the fire extinguishing gas when receiving an indication signal sent by the fire-fighting host machine and indicating that the energy storage device is in the fire-fighting state.

In summary, the expansion body is arranged on the back plate, and the electric connection between the battery cluster and the power supply circuit is realized through the module connecting piece, so that the battery cluster can be pushed out when the expansion body expands, the battery cluster can be disconnected from the electric connection with the power supply circuit in time, the action is rapid, and thermal runaway and fire spreading to other battery modules can be avoided in time, thereby playing roles of fire prevention and fire extinguishment. In addition, the communication failure between the battery management system and the fire-fighting host computer can be avoided, or when the battery management system fails, the battery management system cannot disconnect the power supply circuit in time, so that the thermal runaway of the battery cluster or the fire disaster cannot be controlled in time. Meanwhile, the situation that the battery management system receives the fire-fighting host signal and delays the signal sending time of the battery management system, so that a power circuit cannot be disconnected in time to cause fire spread can be avoided.

Drawings

In order to more clearly describe the embodiments of the present application or the technical solutions in the background art, the following description will describe the drawings that are required to be used in the embodiments of the present application or the background art.

Fig. 1 is a schematic view of a part of a structure of an energy storage device according to an embodiment of the present application;

FIG. 2 is a schematic diagram of a battery cluster in the energy storage device of FIG. 1;

fig. 3 is a schematic view illustrating the structure of a battery module in the battery cluster shown in fig. 2;

FIG. 4 is a schematic view of a portion of the energy storage device of FIG. 1;

fig. 5 is an enlarged schematic view of a module connector in the energy storage device of fig. 1.

Reference numerals: the energy storage device-1000, the box body-110, the battery stack-100, the top wall-1101, the bottom wall-1102, the side wall-1103, the accommodating space-1104, the battery cluster-10, the bracket-11, the bottom end-111, the top end-112, the battery module-12, the first battery module-12 a, the second battery module-12 b, the third battery module-12 c, the fourth battery module-12 d, the fifth battery module-12 e, the sixth battery module-12 f, the seventh battery module-12 g, the eighth battery module-12 h, the battery module body-121, the module positive plug-in component-122, the module negative plug-in component-123, the high-voltage box-13, the moving part-14, the backboard-20, the novel high-voltage module comprises a top surface-21, a bottom surface-22, a mounting surface-23, a reinforcing rib-24, a copper bar-1, a module copper bar-30, a first module copper bar-31, a second module copper bar-32, a third module copper bar-33, a fourth module copper bar-34, a fifth module copper bar-35, a sixth module copper bar-36, a seventh module copper bar-37, an eighth module copper bar-38, a high-voltage box copper bar-40, a first high-voltage box copper bar-41, a second high-voltage box copper bar-42, a module connector-50, a main connector-51, an electric connector-511, a fixing sleeve-512, a main clamping part-52, a clamping body-521, a spring piece-522 and a clamping groove-523.

Detailed Description

Embodiments of the present application are described below with reference to the accompanying drawings.

Referring to fig. 1, fig. 1 is a schematic diagram illustrating a portion of an energy storage device 1000 according to an embodiment of the application.

The energy storage device 1000 includes a case 110, a battery stack 100, sensors, a fire host, a Battery Management System (BMS), a gas release device, and a power circuit (not shown).

The housing 110 includes a top wall 1101, a bottom wall 1102, and side walls 1103. The side wall 1103 is connected between the top wall 1101 and the bottom wall 1102, and the top wall 1101, the bottom wall 1102 and the side wall 1103 together enclose a containing space 1104. The sensors, fire host, battery Management System (BMS), gas release device, and power circuit are all located within the receiving space 1104. In this embodiment, the number of the cell stacks 100 is two. In other embodiments, the stack 100 may be one, three, or more than four. The sensor is electrically connected with a fire engine, the fire engine is electrically connected with a battery management system, the battery management system is electrically connected with a power circuit and a gas release device, and the power circuit is electrically connected with the battery stack 100.

The sensor may be a temperature sensor, a current-voltage sensor or a smoke sensor. When the sensor is a temperature sensor, the sensor is fixedly connected with the cell stack 100 and is used for detecting the temperature of the cell stack 100. The sensor is a current-voltage sensor, and the sensor is electrically connected to the cell stack 100 and is used for detecting the current voltage of the cell stack 100. When the sensor is a smoke sensor, the sensor may be mounted on the battery stack 100 or may be mounted at other positions in the housing 110 for detecting the smoke concentration in the housing 110.

The sensor transmits the detected signal to the fire host, and the fire host judges the fire condition of the energy storage device 1000 according to the received signal. When the fire-fighting host computer judges that the energy storage device 1000 is in the fire-fighting state, the fire-fighting host computer outputs a signal to the battery management system, and the battery management system disconnects the power circuit, so that the power circuit is disconnected from the battery stack 100, and the fire spread of the battery stack 100 is prevented. Meanwhile, the battery management system controls the gas release device to release fire-extinguishing gas so as to achieve the aim of extinguishing fire. When the fire host determines that the energy storage device 1000 is in a non-fire state, the fire host continues to receive the signal transmitted from the sensor.

Referring to fig. 2, fig. 2 is a schematic diagram illustrating a portion of a battery cluster 10 in the energy storage device 1000 shown in fig. 1.

The stack 100 includes a cell cluster 10, a back plate 20, copper bars 1 (shown in fig. 3), module connectors 50 (shown in fig. 4), and an expansion body (not shown). The copper bar 1 is fixedly connected with the back plate 20. The battery cluster 10 is arranged side by side with the back plate 20, and the expansion body is arranged on the back plate 20 and is positioned between the back plate 20 and the battery cluster 10. The module connector 50 is fixedly and electrically connected with the copper bar 1, and simultaneously the module connector 50 is clamped and electrically connected with the battery cluster 10. When the expansion body expands due to heat, the battery cluster 10 is pushed, and the module connecting piece 50 is disconnected from the battery cluster 10, so that the battery cluster 10 is disconnected from the power circuit.

The battery pack 10 includes a bracket 11, a battery module 12, a high voltage case 13, and a moving member 14. The bracket 11 includes a bottom end 111 and a top end 112. The bottom end 111 and the top end 112 are disposed opposite to each other and are located on opposite sides of the stand 11 in the Z direction. The bracket 11 is provided with an installation space.

For convenience of description, in the present application, the height direction of the battery cluster 10 is defined as the Z direction, the length direction of the battery module 12 is defined as the Y direction, and the width direction of the battery module 12 is defined as the X direction. The X direction, the Y direction and the Z direction are perpendicular to each other. It is understood that the Z direction is a vertical direction, and the X direction and the Y direction are parallel to the horizontal direction.

Referring to fig. 3 together, fig. 3 is a schematic diagram illustrating a structure of a battery module 12 in the battery pack 10 shown in fig. 2.

The battery modules 12 are plural. In the present embodiment, the number of battery modules 12 is 8. In other embodiments, the number of battery modules 12 may be 6, 7, or 9 or more. From the top end 112 to the bottom end 111, the 8 battery modules 12 are a first battery module 12a, a second battery module 12b, a third battery module 12c, a fourth battery module 12d, a fifth battery module 12e, a sixth battery module 12f, a seventh battery module 12g, and an eighth battery module 12h, respectively. Each battery module 12 includes a battery module body 121 and a module connector. The modular plug includes a modular positive plug 122 and a modular negative plug 123. The module positive and negative insertion members 122 and 123 are fixed to the same side of the battery module body 121 and protrude from the surface of the battery module body 121. The module positive plug member 122 and the module negative plug member 123 are electrically connected with the battery module body 121. The plurality of battery modules 12 are all installed in the support 11 and fixedly connected with the support 11, and the plurality of battery modules 12 are stacked along the Z direction. Wherein, the module positive plug-in part 122 of each battery module 12 is disposed adjacent to the module negative plug-in part 123 of the adjacent battery module 12, and the module negative plug-in part 123 is disposed adjacent to the module positive plug-in part 122 of another adjacent battery module 12. For example, the module positive insertion member 122 of the second battery module 12b is disposed adjacent to the module negative insertion member 123 of the first battery module 12a, and the module negative insertion member 123 of the second battery module 12b is disposed adjacent to the module positive insertion member 122 of the third battery module 12 c.

The high-voltage cartridge 13 includes a high-voltage cartridge body, a high-voltage positive plug member, and a high-voltage negative plug member (not shown). The high-voltage positive plug-in component and the high-voltage negative plug-in component are fixed on the same side of the high-voltage box body and protrude out of the surface of the high-voltage box body. The high-voltage positive plug-in component and the high-voltage negative plug-in component are electrically connected with the high-voltage box body. The high-voltage case 13 is mounted between the bottom end 111 of the bracket 11 and the battery module 12, and is stacked in the Z direction with the battery module 12. That is, the high voltage case 13 is located between the eighth battery module 12h and the bottom end 111. When the battery module 12 adjacent to the high voltage case 13, i.e., the eighth battery module 12h, is the module positive plug member 122 on the side close to the high voltage case 13, the high voltage negative plug member of the high voltage case 13 is located on the side close to the battery module 12. When the side of the eighth battery module 12h close to the high-voltage case 13 is the module negative plug member 123, the high-voltage positive plug member of the high-voltage case 13 is located at the side close to the battery module 12. That is, the module negative plug member 123 is disposed adjacent to the high-voltage positive plug member in the vertical direction so that the high-voltage cartridge 13 is connected in series with the battery module 12. The high voltage box 13 is connected in series with the battery module 12 for outputting and distributing electric power in the battery module 12.

In this embodiment, the moving member 14 is a caster. The castor is installed at the bottom 111 of the bracket 11 and is fixedly connected with the bracket 11. The number of the casters can be 4 or 6 or 8. The number of casters may be adjusted according to the weight of the battery pack 10, and is not limited herein. The rotation of the casters moves the entire battery pack 10 to reduce friction between the casters and the horizontal surface.

Referring to fig. 4, fig. 4 is a schematic diagram illustrating a portion of the energy storage device 1000 shown in fig. 1.

The back plate 20 has a rectangular plate-like structure. The back plate 20 includes a top surface 21, a bottom surface 22, and a mounting surface 23. The bottom surface 22 and the top surface 21 are disposed opposite to each other and are located on opposite sides of the back plate 20 in the Z direction. The mounting surface 23 is connected between the top surface 21 and the bottom surface 22. The mounting surface 23 is provided with reinforcing ribs 24. The number of the reinforcing ribs 24 is plural. The plurality of reinforcing ribs 24 are arranged at intervals along the longitudinal direction (Z direction) of the back plate 20. In this embodiment, the number of the reinforcing ribs 24 is 8. The 8 ribs 24 divide the mounting surface 23 into 9 mounting areas. The 9 mounting areas are provided corresponding to the battery module 12 and the high voltage case 13, respectively.

In this embodiment, the expansion body is an expansion coating. The intumescent coating is formed by coating the surface of the backing plate 20 with a thermally expandable material. A thermal expansion material is a material that can cause volumetric expansion by a physical and chemical reaction, and upon an increase in temperature, the expansion material volumetric expands. The expansion body is arranged on the mounting surface 23 of the backboard 20 and is fixedly connected with the backboard 20. In other embodiments, the expansion body may also be an expansion alloy. The expansion alloy contains at least two metals, and the expansion coefficients of the two metals are different. When the temperature of the expansion alloy increases, the expansion alloy expands due to the difference in expansion coefficients of the different metals.

The copper bar 1 includes a module copper bar 30 and a high voltage box copper bar 40. In this embodiment, the number of the module copper bars 30 is 8, and the number of the high-voltage box copper bars 40 is two. From top end 112 to bottom end 111, 8 module copper bars 30 are respectively a first module copper bar 31, a second module copper bar 32, a third module copper bar 33, a fourth module copper bar 34, a fifth module copper bar 35, a sixth module copper bar 36, a seventh module copper bar 37 and an eighth module copper bar 38, and two high-voltage box copper bars 40 are a first high-voltage box copper bar 41 and a second high-voltage box copper bar 42. The modular copper bars 30 are identical in construction to the high voltage box copper bars 40. The high voltage box copper bars 40 and the 8 module copper bars 30 are fixed on the mounting surface 23 and are arranged at intervals along the Z direction. The 8 module copper bars 30 are arranged in one-to-one correspondence with the 8 battery modules 12, and the module copper bars 30 are used for electrically connecting with the battery modules 12. The high-voltage box copper bar 40 is disposed corresponding to the high-voltage box 13, and the high-voltage box copper bar 40 is used to electrically connect the high-voltage box 13 with the battery module 12.

Referring to fig. 5, fig. 5 is an enlarged schematic view of a module connector 50 in the energy storage device 1000 shown in fig. 1.

The module connector 50 is a high current terminal. Each module connector 50 includes a main connecting portion 51 and a main clamping portion 52. The main connecting portion 51 is fixedly connected to the main holding portion 52, and the main holding portion 52 is vertically connected to the main connecting portion 51. The main connection part 51 includes an electrical connector 511 and a fixing sleeve 512. The electrical connector 511 is a metal sheet. The fixing sleeve 512 is a plastic member. The electrical connector 511 is mounted on the fixing sleeve 512 and is fixedly connected with the fixing sleeve 512. And, one surface and both ends of the electric connector 511 are exposed out of the fixing sleeve 512. The electrical connector 511 is used for fixedly and electrically connecting with the module copper bar 30. The main holding portion 52 includes a holding body 521 and a spring 522. The clamping body 521 is a plastic member. The clamping body 521 is U-shaped. The clamping body 521 is provided with a clamping groove 523. The clamping body 521 is fixedly connected with the fixing sleeve 512, and the opening of the clamping groove 523 faces to one side far away from the fixing sleeve 512. Specifically, the clamping body 521 may be integrally formed with the fixing sleeve 512. The spring 522 is made of metal. In this embodiment, there are a plurality of spring plates 522. The elastic pieces 522 are fixed to the inner wall of the slot 523, and are arranged side by side and spaced along the inner wall of the slot 523, and each elastic piece 522 passes through the clamping body 521 and the fixing sleeve 512 to be electrically connected with the electrical connector 511.

The energy storage device 1000 also includes a high voltage cartridge connector (not shown). The structure of the high voltage box connector is the same as that of the module connector 50, and the high voltage box connector is a high current terminal. The high-pressure box connecting piece comprises a secondary connecting part and a secondary clamping part. The auxiliary connecting part comprises an auxiliary electric connector and an auxiliary fixing sleeve. The auxiliary clamping part comprises an auxiliary clamping body and an auxiliary elastic piece.

The number of module connectors 50 is plural. In this embodiment, there are 16 module connectors 50, and two high-voltage box connectors. The module positive mating member 122 and the module negative mating member 123 of each battery module 12 are connected to one module connector 50. The high-voltage positive plug-in part and the high-voltage negative plug-in part of the high-voltage box 13 are each connected to a high-voltage box connection.

Referring to fig. 2 to 5, the battery pack 10 is located on a side of the back plate 20 near the mounting surface 23 and is disposed side by side with the back plate 20. The 1 st to 16 th module connectors 50 to 50 are arranged in order along the direction from the top surface 21 to the bottom surface 22. The first module connector 50 is mounted on the first module copper bar 31, and is electrically and fixedly connected with the first module copper bar 31. The electrical connector 511 contacts the first module copper bar 31 and is fixedly connected with the first module copper bar 31 through a bolt. In other embodiments, the electrical connector 511 may also be soldered to the first module copper bar 30. The module positive insertion member 122 of the first battery module 12a is positioned in the locking groove 523 of the locking body 521 of the first module connector 50 and locked with the locking body 521. The module positive plug member 122 of the first battery module 12a is electrically connected to the elastic piece 522, so that the module positive plug member 122 of the first battery module 12a is electrically connected to the first module copper bar 31.

The 2 nd module connector 50 and the 3 rd module connector 50 are both mounted to the second module copper bar 32 and are both electrically and fixedly connected to the second module copper bar 32. The electrical connector 511 of the 2 nd module connector 50 is fixedly connected and electrically connected to the second module copper bar 32, the module negative plug member 123 of the first battery module 12a is located in the clamping slot 523 of the clamping body 521 of the 2 nd module connector 50 and is clamped with the clamping body 521 of the 2 nd module connector 50, and the module negative plug member 123 of the first battery module 12a is electrically connected to the elastic sheet 522, so that the module negative plug member 123 of the first battery module 12a is electrically connected to the second module copper bar 32. The electrical connector 511 of the 3 rd module connector 50 is fixedly connected and electrically connected with the second module copper bar 32, the module positive plugging member 122 of the second battery module 12b is located in the clamping groove 523 of the clamping body 521 of the 3 rd module connector 50 and clamped with the clamping body 521 of the third module connector 50, and the module positive plugging member 122 of the second battery module 12b is electrically connected with the elastic sheet 522, so that the module positive plugging member 122 of the second battery module 12b is electrically connected with the second module copper bar 32, and the first battery module 12a is connected with the second battery module 12b in series.

A module connector 50 is disposed between each module copper bar 30 and the corresponding module positive plug member 122, and between each module copper bar 30 and the corresponding module negative plug member 123. The main clamping portion 52 of each module connector 50 is clamped and electrically connected with the corresponding module positive or negative plug member 122 or 123 of the battery module 12. The 4 th module connector 50 and the 5 th module connector 50 are electrically and fixedly connected with the third module copper bar 33, and the 4 th module connector 50 clamps the module negative plug-in component 123 of the second battery module 12b, and the 5 th module connector 50 clamps the module positive plug-in component 122 of the third battery module 12 c. The 6 th module connecting member 50 and the 7 th module connecting member 50 are electrically and fixedly connected with the fourth module copper bar 34, and the 6 th module connecting member 50 clamps the module negative plug-in part 123 of the third battery module 12c, and the 5 th module connecting member 50 clamps the module positive plug-in part 122 of the fourth battery module 12 d. By this inward pushing, the 14 th module connecting member 50 and the 15 th module connecting member 50 are electrically and fixedly connected with the 8 th module copper bar 38, and the 14 th module connecting member 50 clamps the module negative plug-in component 123 of the seventh battery module 12g, and the 15 th module connecting member 50 clamps the module positive plug-in component 122 of the eighth battery module 12h, so that the series connection between the 8 battery modules 12 is realized. The 16 th module connector 50 is fixedly and electrically connected to the first high voltage box copper bar 41, and the 16 th module connector 50 holds the module negative plug member 123 of the eighth battery module 12h.

The high-voltage box connecting piece is installed in the high-voltage box copper bar 40 and is fixedly connected and electrically connected with the high-voltage box copper bar 40, and meanwhile, the high-voltage box connecting piece is electrically connected and clamped with the high-voltage box 13. The auxiliary electrical connector of the first high-voltage box connector is fixedly connected and electrically connected with the first high-voltage box copper bar 41, the high-voltage positive plug-in component of the high-voltage box 13 is located in the clamping groove of the auxiliary clamping body of the first high-voltage box connector and clamped with the auxiliary clamping body, and the high-voltage positive plug-in component is electrically connected with the auxiliary elastic piece, so that the high-voltage positive plug-in component is electrically connected with the first high-voltage box copper bar 41, and the high-voltage box 13 is serially connected with the eighth battery module 12h. The auxiliary electric connector of the second high-voltage box connector is fixedly connected and electrically connected with the second high-voltage box copper bar 42, the high-voltage negative plug-in component of the high-voltage box 13 is positioned in the clamping groove of the auxiliary clamping body of the second high-voltage box connector and clamped with the auxiliary clamping body, and the high-voltage negative plug-in component is electrically connected with the auxiliary elastic piece, so that the high-voltage negative plug-in component is electrically connected with the second high-voltage box copper bar 42.

That is, 8 battery modules 12 are sequentially connected in series, and then connected in series with the high voltage case 13. The positive electrode of the battery pack 10 is led out from the module positive plug-in part 122 of the first battery module 12a and is electrically connected to the power supply circuit. Specifically, the module positive plug member 122 of the first battery module 12a may be directly electrically connected to the power circuit, or the first module copper bar 31 may be electrically connected to the power circuit, so that the module positive plug member 122 of the first battery module 12a is electrically connected to the power circuit. The negative electrode of the battery cluster 10 is led out by the high-voltage negative plug-in component of the high-voltage box 13 and is electrically connected with the power circuit, so that the battery cluster 10 and the power circuit form a current loop. Specifically, the high voltage negative plug component may be directly electrically connected to the power circuit, or the second high voltage box copper bar 42 may be electrically connected to the power circuit, thereby implementing the electrical connection between the high voltage box 13 and the power circuit.

Referring to fig. 1, a cell stack 100 is mounted in a case 110. The back plate 20 is fixedly connected with the side wall 1103, and the moving member 14 of the battery pack 10 is located on the bottom wall 1102 and can roll along the bottom wall 1102. When the battery cluster 10 is out of control or is on fire, the temperature of the battery cluster 10 is increased, the back plate 20 and the expansion body are heated to expand, the volume is increased, and an acting force towards the direction away from the back plate 20 is applied to the battery cluster 10, so that the moving piece 14 drives the battery cluster 10 to move towards the direction away from the back plate 20. Simultaneously, the module positive plug-in component 122 and the module negative plug-in component 123 of the battery module 12 move towards the main clamping part 52 away from the corresponding module connecting piece 50, are unlocked with the main clamping part 52, and are disconnected electrically with the elastic sheet 522; the high-voltage positive plug-in component and the high-voltage negative plug-in component of the high-voltage box 13 move towards the connecting piece of the high-voltage box far away from the corresponding high-voltage box, are unlocked with the auxiliary clamping part and are electrically disconnected with the auxiliary elastic piece, so that the battery cluster 10 is pushed away towards the direction far away from the backboard 20, the battery cluster 10 is electrically disconnected with the power supply circuit, the battery cluster 10 is prevented from continuously generating thermal runaway, the fire spreading is controlled, and the effects of fire prevention and fire extinguishment are achieved.

Meanwhile, when the battery cluster 10 is out of control or is on fire, the sensor can also be used for detecting a parameter signal corresponding to the battery cluster 10 and transmitting the signal to the fire-fighting host, the fire-fighting host outputs the signal to the battery management system, and the battery management system breaks off the power supply circuit, so that the power supply circuit is electrically disconnected from the battery stack 100, and the fire spread of the battery stack 100 is prevented. And the battery management system controls the gas release device to release the fire-extinguishing gas so as to achieve the aim of extinguishing fire.

In this embodiment, the large current terminal with the main connection portion 51 and the main clamping portion 52 is adopted as the module connection member 50, so that when the battery cluster 10 is pushed in towards the back plate 20, the fixed connection between the battery cluster 10 and the back plate 20 can be realized, the fixing mode is simplified, and the operation is simple and flexible.

Meanwhile, in this embodiment, the expansion body is disposed on the back plate 20, and the electrical connection between the battery cluster 10 and the power supply circuit is realized through the module connector 50, and the battery cluster 10 can be pushed out when the expansion body expands, so that the battery cluster 10 can be disconnected from the electrical connection with the power supply circuit in time, the operation is rapid, and the thermal runaway and the fire spreading to other battery modules 12 or to other battery stacks 100 can be avoided in time, thereby playing roles in fire prevention and fire extinguishment. In addition, the communication failure between the battery management system and the fire-fighting host computer can be avoided, or when the battery management system fails, the battery management system cannot timely disconnect the power supply circuit, so that the thermal runaway of the battery cluster 10 or the fire disaster cannot be timely controlled. Meanwhile, the situation that the battery management system receives the fire-fighting host signal and delays the signal sending time of the battery management system, so that a power circuit cannot be disconnected in time to cause fire spread can be avoided.

In addition, in this embodiment, on the one hand, the battery cluster 10 can be pushed out through the expansion of the expansion body to realize power failure, and on the other hand, the power failure and fire extinguishment can also be realized through the cooperation among the fire-fighting host, the battery management system and the gas release device, that is, the physical action fire extinguishment and the electrical action fire extinguishment are mutually matched, so that the fire safety of the energy storage device 1000 is further improved.

The above is only a part of examples and embodiments of the present application, and the scope of the present application is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present application, and the changes and substitutions are covered in the scope of the present application. Therefore, the protection scope of the application is subject to the protection scope of the claims.

Claims

1. An energy storage device, comprising: the device comprises a power circuit, a battery cluster, a back plate, a module connecting piece and an expansion body;

the battery cluster comprises a battery module, wherein the battery module comprises a battery module body and a module plug connector, and the module plug connector is electrically connected with the battery module body;

the module connecting piece comprises a main connecting part and a main clamping part, and the main connecting part is electrically connected with the main clamping part;

the expansion body is arranged on the surface of the backboard, and the volume of the expansion body becomes large when the expansion body is heated;

the battery clusters are arranged side by side with the back plate and are opposite to the expansion body, and the module connecting piece is positioned between the back plate and the battery module body;

the module plug-in component comprises a module positive plug-in component and a module negative plug-in component which are arranged at intervals along the vertical direction;

the plurality of battery modules are stacked along the vertical direction and connected in series;

each battery module is provided with one module positive plug-in component and one module negative plug-in component, and the module positive plug-in components of two adjacent battery modules are arranged adjacent to the module negative plug-in components;

two module connecting pieces are arranged between two adjacent battery modules, main connecting parts of the two module connecting pieces are electrically connected, a main clamping part of one module connecting piece is clamped and electrically connected with the adjacent module positive plug-in component and the adjacent module negative plug-in component, and a main clamping part of the other module connecting piece is clamped and electrically connected with the adjacent module positive plug-in component and the adjacent module negative plug-in component; the battery modules are electrically connected with the power supply circuit through the main connecting part of one of the module connecting pieces, and when the expansion body expands due to heating, the battery cluster is pushed to be far away from the back plate, and the module connecting piece connected with the power supply circuit is disconnected with the battery cluster to disconnect the electric connection of the battery cluster and the power supply circuit.

2. The energy storage device of claim 1, wherein the expansion body is a thermal expansion coating coated on the surface of the back plate with a thermal expansion material or an expansion alloy provided on the surface of the back plate.

3. The energy storage device of claim 1, wherein the battery pack comprises casters, the casters are fixed to the bottom ends of the battery pack, and the casters roll to drive the battery pack to move.

4. The energy storage device of claim 2 or 3, wherein the battery cluster further comprises a high voltage cartridge, the high voltage cartridge being stacked in the vertical direction and electrically connected to the battery module.

5. The energy storage device of claim 4, wherein the high voltage cartridge comprises a high voltage cartridge body and a high voltage plug, the high voltage plug comprising a high voltage positive plug component and a high voltage negative plug component, the high voltage positive plug component and the high voltage negative plug component being electrically connected, the high voltage positive plug component and the high voltage negative plug component being spaced apart along the vertical direction;

the module positive plug-in components, a plurality of module negative plug-in components, high pressure positive plug-in components and high pressure negative plug-in components all are located the same side of battery cluster, one of them module negative plug-in components with high pressure positive plug-in components is followed vertical direction is adjacent to be set up, high pressure box with battery module series connection.

6. The energy storage device of claim 5, further comprising a high voltage cartridge connector comprising a secondary connection portion and a secondary clamping portion, the secondary connection portion being electrically connected to the secondary clamping portion;

the number of the high-voltage box connecting pieces is two, and the auxiliary connecting parts of the two high-voltage box connecting pieces are fixedly connected with the backboard;

the main clamping part of the module connecting piece which is electrically connected with the power circuit is clamped and electrically connected with the module positive plug-in component, the auxiliary connecting part of one high-voltage box connecting piece is electrically connected with the power circuit, and the auxiliary clamping part is clamped and electrically connected with the high-voltage negative plug-in component;

one of the plurality of module connecting pieces is adjacent to and electrically connected with the other high-voltage box connecting piece, and the main clamping part of the module connecting piece adjacent to the high-voltage box is clamped and electrically connected with the module negative plug-in component, and the auxiliary clamping part of the other high-voltage box connecting piece is clamped and electrically connected with the high-voltage positive plug-in component.

7. The energy storage device of claim 6, further comprising a plurality of module copper bars, wherein the module copper bars are fixed on the surface of the back plate, and the main connection parts of the two module connection members disposed between two adjacent battery modules are electrically connected through the module copper bars disposed between two adjacent battery modules.

8. The energy storage device of claim 6, further comprising two high voltage copper bars, the two high voltage copper bars being secured to a surface of the back plate; the main connecting part of the module connecting piece, which is arranged adjacent to the high-voltage box, is electrically connected with the auxiliary connecting part of the high-voltage box connecting piece, which is clamped on the high-voltage positive plug-in component, through one of the high-voltage copper bars, and the auxiliary connecting part of the high-voltage box connecting piece, which is clamped on the high-voltage negative plug-in component, is electrically connected with the power circuit through the other high-voltage copper bar.

9. The energy storage device of claim 1, further comprising a sensor, a fire host, and a battery management system, the sensor being electrically connected to the fire host, the fire host being electrically connected to the battery management system, the battery management system being electrically connected to the power circuit; the fire control system comprises a sensor, a fire control host and an energy storage device, wherein the sensor is used for detecting the state of the battery cluster and generating a detection signal, and the fire control host is used for receiving the detection signal generated by the sensor and judging the fire control state of the energy storage device according to the signal; when the fire-fighting host judges that the energy storage device is in a fire-fighting state, the fire-fighting host outputs an indication signal indicating that the energy storage device is in the fire-fighting state to the battery management system, so that the battery management system disconnects the power supply circuit, and the power supply circuit is disconnected from the battery cluster.

10. The energy storage device of claim 9, further comprising a gas release device electrically connected to the battery management system and configured to release fire suppressing gas, the battery management system further configured to control the gas release device to release the fire suppressing gas upon receipt of an indication signal sent by the fire host indicating that the energy storage device is in the fire condition.