Energy storage system and safety control method thereof

Abstract

The application relates to an energy storage system and a safety prevention and control method, which comprises two or more liquid cooling plates, one or more battery clusters arranged between the liquid cooling plates, and a multilayer structure formed by assembling the liquid cooling plates and the battery clusters; each battery cluster comprises a battery cluster shell, a battery pack, a battery integrated cover plate and a heat pipe auxiliary heat dissipation system; the battery pack is arranged in the battery cluster shell with an open front; the heat pipe auxiliary heat dissipation system is arranged on the top of the battery pack and is connected with the pipeline of the liquid cooling plate, and is used for liquid cooling heat dissipation of the battery pack; the battery integrated cover plate is arranged in front of the battery pack and is electrically connected with the battery pack, and a control circuit is arranged in the battery integrated cover plate, which is used for collecting temperature and voltage data of the battery pack, and controlling the liquid cooling plate and the heat pipe auxiliary heat dissipation system according to the collection results. The application can be widely applied in the field of energy storage batteries.

Description

Technical Field

[0001] This invention relates to the field of energy storage batteries, specifically to an energy storage system from cell to battery cluster and its safety control method. Background Technology

[0002] In the construction of the new generation of sustainable smart grids, a large amount of renewable energy such as wind and solar power is being integrated into the grid. However, unlike traditional thermal power plants, renewable energy generation is unsustainable and unpredictable, posing a risk of grid instability. To address this issue, lithium-ion battery energy storage systems have demonstrated their potential value, offering rapid energy storage and release capabilities, flexible installation, and high technological maturity. Therefore, configuring energy storage systems in a certain proportion on the renewable energy side can improve grid fluctuations and enhance the absorption capacity of renewable energy generation.

[0003] However, due to cost issues, the current integration process of lithium battery energy storage systems is complex, the standard component sizes vary, and the integration process requires a large number of unnecessary connectors and wiring harnesses, resulting in long integration cycles and low energy density. Therefore, developing a new generation of system-level integration technology is one of the effective ways to reduce costs.

[0004] Furthermore, as market demand for energy storage technology continues to increase, the heat handling capabilities of energy storage systems are somewhat insufficient in various scenarios. This often leads to power regulation capabilities yielding to temperature control, especially since the temperature difference between the top and bottom of the battery cell has a significant impact on the cell's temperature rise and lifespan. Therefore, how to achieve flexible temperature control in highly integrated energy storage systems is also one of the research issues. Summary of the Invention

[0005] To address the aforementioned problems, the present invention aims to provide an energy storage system and its safety control method. By designing a highly integrated flexible battery cluster, the battery cells are integrated into one unit, and liquid cooling is used to improve the problem of uneven heat dissipation between the upper and lower parts of the battery cells.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] In a first aspect, the present invention provides an energy storage system, comprising:

[0008] Two or more liquid cooling plates and one or more battery clusters disposed between each pair of liquid cooling plates, wherein the liquid cooling plates and the battery clusters are assembled to form a multi-layer structure;

[0009] Each of the battery clusters includes a battery cluster housing, a battery pack, a heat pipe-assisted heat dissipation system, and a battery integrated cover plate;

[0010] The battery pack is fixedly installed inside the battery cluster housing with a front opening;

[0011] The heat pipe auxiliary heat dissipation system is arranged on the top of the battery pack and connected with the liquid cooling plate pipeline, and is used for liquid cooling heat dissipation of the battery pack.

[0012] The battery integrated cover plate is arranged in front of the battery pack and electrically connected with the battery pack, and the control circuit is arranged in the battery integrated cover plate, which is used for collecting temperature and voltage data of the battery pack, and controlling the liquid cooling plate and the heat pipe auxiliary heat dissipation system according to the collection results.

[0013] Further, the battery pack comprises at least one cell, and when the battery pack comprises more than two cells, the cells are fixedly connected by adhesion.

[0014] Further, each cell comprises at least one winding core or stacking core and a cell shell, and when the cell comprises more than two winding cores or stacking cores, the winding cores or stacking cores are connected in series or parallel, and the positive and negative terminals of each cell are unified on the side surface of the cell.

[0015] Further, the heat pipe auxiliary heat dissipation system comprises a heat-conducting adhesive sheet and a heat pipe heat exchange sheet, the heat pipe heat exchange sheet is fixedly arranged on the top of the battery pack through the heat-conducting adhesive sheet, and at least one heat pipe connecting interface is arranged in the middle of the heat pipe heat exchange sheet, and each heat pipe connecting interface is connected with the liquid cooling plate pipeline.

[0016] Further, the heat-conducting adhesive sheet is arranged at the middle position of the top of the battery pack, and the area of the heat-conducting adhesive sheet is within 1% to 99% of the area of the upper surface of the battery pack.

[0017] The heat pipe heat exchange sheet is arranged at the middle position of the heat-conducting adhesive sheet, and the area of the heat pipe heat exchange sheet is within 1% to 99% of the area of the heat-conducting adhesive sheet.

[0018] Further, more than one raised heat dissipation particle is arranged on the heat-conducting adhesive sheet, and each raised heat dissipation particle is uniformly arranged on the heat-conducting adhesive sheet outside the heat pipe heat exchange sheet.

[0019] Further, the liquid cooling plate comprises a liquid cooling plate shell, a serpentine liquid cooling pipeline, a liquid cooling plate inlet, a liquid cooling plate outlet, more than one heat pipe heat exchange head, a heat pipe pipeline and an electromagnetic valve, the serpentine liquid cooling pipeline is arranged in the liquid cooling plate shell, and the two ends of the serpentine liquid cooling pipeline are respectively connected with the liquid cooling plate inlet and the liquid cooling plate outlet, one end of each heat pipe pipeline is connected with the serpentine liquid cooling pipeline through each heat pipe heat exchange head which is partially arranged in the liquid cooling plate, and the other end of each heat pipe pipeline is connected with the heat pipe connecting interface in the heat pipe auxiliary heat dissipation system, each heat pipe heat exchange head and heat pipe connecting interface is controlled by the electromagnetic valve, and the electromagnetic valve is controlled by the control circuit.

[0020] Further, the battery integrated cover plate comprises a cover plate shell, a conductive connecting piece, a first polarity interface, a second polarity interface and a control circuit; a part of the cover plate shell corresponding to the connection terminal of each single battery cell in the battery pack is hollowed out, and the series / parallel connection of each single battery cell in the battery pack is realized through the built-in conductive connecting piece; the first polarity interface and the second polarity interface are arranged at two ends of the cover plate shell and are used for leading out the current in the battery pack; the control circuit is used for collecting the surface temperature and voltage of the battery pack, and controlling the on-off state of the battery cluster circuit and the pipeline state of the liquid cooling plate and the heat pipe auxiliary cooling system according to the collected data.

[0021] Further, the control circuit comprises a temperature sensor, a voltage sensor and a CTR battery cluster control unit; the temperature sensor and the voltage sensor are respectively used for collecting the temperature of the surface of the battery pack and the voltage data on the battery terminal and sending to the CTR battery cluster control unit; the CTR battery cluster control unit is used for automatically cutting off the whole battery cluster circuit and alarming when the collected temperature and voltage data meet the alarm condition, and automatically opening the electromagnetic valve in the liquid cooling plate after a preset time to exchange heat with the battery pack by using the refrigerant in the liquid cooling plate.

[0022] In the second aspect, the application provides a safety control method of the energy storage system, comprising the following steps:

[0023] The battery integrated cover plate collects the temperature and voltage data of the battery pack, automatically cuts off the whole battery cluster circuit and alarms when the temperature and voltage data meet the alarm condition;

[0024] After a preset time, if the alarm cannot be solved, the liquid cooling plate and the heat pipe auxiliary cooling system are directly opened to cool the battery cluster by using the refrigerant in the liquid cooling plate to block the heat spread.

[0025] The application has the following advantages due to the above technical scheme:

[0026] 1. The application adopts the CTR technology, directly integrates the battery cell into the battery cluster of the energy storage system, designs the highly integrated flexible assembled battery cluster, integrates the battery cell, reduces a large number of connection and fixing components required for grouping, shortens the process cycle, and improves the space utilization of the battery box by using the flexible assembly technology.

[0027] 2. The application innovatively develops the heat pipe-liquid cooling integrated linkage cooling system, the refrigerant of the heat pipe can quickly release the heat at the top of the battery cell through the upper liquid cooling plate, the liquid cooling mode integrated in the upper and lower cover plates of the battery box further improves the uneven heat dissipation problem of the large-capacity battery cell, effectively suppresses the occurrence of thermal runaway, and reduces the economic loss.

[0028] 3. The application also designs a thermal protection method for the CTR integrated energy storage system, effectively identifies thermal runaway and blocks the spread of heat in the first time.

[0029] Therefore, the application can be widely applied in the field of energy storage batteries. BRIEF DESCRIPTION OF DRAWINGS

[0030] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of the preferred embodiments and are not intended to limit the scope of the application. Throughout the drawings, same reference numerals are used for same components. In the drawings:

[0031] Figure 1 is a schematic diagram of the energy storage system of the application;

[0032] Figure 2 is a schematic diagram of the liquid cooling plate of the energy storage system of the application;

[0033] Figure 3 is a top view of the heat pipe system on the battery pack of the energy storage system of the application;

[0034] Figure 4 is a schematic diagram of the front integrated cover plate of the battery pack of the energy storage system of the application. DETAILED DESCRIPTION

[0035] To make the objects, technical solutions and advantages of the embodiments of the application clearer, the technical solutions of the embodiments of the application will be described clearly and completely below with reference to the drawings of the embodiments of the application. Obviously, the described embodiments are part of the embodiments of the application, rather than all the embodiments of the application. Based on the described embodiments of the application, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the application.

[0036] It should be noted that the terms used herein are only intended to describe specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and it should also be understood that when the terms "comprise" and / or "include" are used in the specification, there is a presence of a feature, step, operation, device, component and / or combination thereof.

[0037] In the field of energy storage, a lithium battery energy storage system generally assembles multiple single cells into a module, assembles the module into a battery pack PACK, and finally integrates multiple battery packs PACK into a battery cluster. The process is complicated, and too many connectors and harnesses are used.

[0038] In some embodiments of the present application, a power storage system from the battery cell to the battery cluster is provided, the battery cell is directly integrated into the power storage system battery cluster, and the battery cell is integrated by designing a highly integrated flexible assembled battery cluster. At the same time, the present application also innovatively develops a heat pipe-liquid cooling integrated linkage cooling system, the refrigerant of the heat pipe can quickly release the heat at the top of the battery cell through the upper liquid cooling plate. The present application adopts CTR technology to directly integrate the power storage battery cell into the flexible assembled steel power storage battery cluster structure, thereby canceling the process from the battery cell to the module, from the module to the battery pack, and from the battery pack to the battery cluster, saving a large number of components including aluminum shell, single cover plate, connecting piece, and packaging tool. The battery cluster is assembled by a plurality of square liquid cooling cabins, the battery is directly integrated onto the liquid cooling plate, and the battery cluster is assembled by the liquid cooling plate. The present application ingeniously designs an integrated heat pipe-liquid cooling plate structure, effectively reduces the heat at the top of the battery cell during continuous operation, and thereby improves the temperature difference between the top and bottom of the battery cell. The present application designs an integrated power storage battery cluster structure, greatly optimizes the temperature control system, simultaneously performs safety protection at the battery box level, slows down the risk of thermal runaway, and improves the space utilization rate of the battery cluster, further expands the design idea of power storage integration, and finally provides a safety protection method of the present power storage system.

[0039] Correspondingly, in some other embodiments of the present application, a safety protection method of a power storage system is also provided, which can effectively identify thermal runaway and block the occurrence of heat spread in the first time.

[0040] Embodiment 1

[0041] As shown in Figure 1 , the present embodiment provides a power storage system, which comprises: one or more battery clusters 1, two or more liquid cooling plates 2, and a battery integrated cover plate 3; wherein each battery cluster 1 is sandwiched between two liquid cooling plates 2 to form a multi-layer structure; each battery cluster 1 comprises a battery cluster shell 11, a battery pack 12, and a heat pipe auxiliary cooling system 13; the battery pack 12 is fixedly arranged in the battery cluster shell 11 with an open front; the heat pipe auxiliary cooling system 13 is arranged at the top of the battery pack 12 and connected with the pipeline of the liquid cooling plate 1, and is used for liquid cooling of the battery pack 12; the battery integrated cover plate 3 is arranged in front of the battery pack 12 and electrically connected with the battery pack 12, and the battery integrated cover plate 3 is provided with a control circuit for collecting temperature and voltage data of the battery pack 12, and controlling the liquid cooling plate 2 and the heat pipe auxiliary cooling system 13 according to the collection results.

[0042] Preferably, the battery pack 12 comprises at least one battery cell. When there are two or more battery cells, the battery cells can be fixedly connected by adhesion. More preferably, in the present embodiment, the number of battery cells in the battery pack 12 is 8.

[0043] Preferably, the shape of the battery cell is square, soft package or cylinder, etc. In the embodiment, the shape of the battery cell is square. Each battery cell comprises at least one winding core or stacking core and a battery cell shell. When two or more winding cores or stacking cores are included, the winding cores or stacking cores are connected in series or parallel, and the connection mode includes but is not limited to laser welding / supersonic welding, and the positive and negative terminals of each battery cell are unified on the side of the battery cell (i.e. the side corresponding to the integrated cover plate of the battery). More preferably, in the embodiment, the battery cell is connected in parallel by laser welding of two stacking cores. The battery cell shell is made of aluminum or steel.

[0044] Preferably, the battery cluster shell 11 is an integrated steel shell, which can have a regular shape including a square shape and an irregular shape, and the shell thickness is 1-10 mm of stainless steel, and the thickness is preferably 5 mm.

[0045] Preferably, as shown in Figure 2 The heat pipe assisted heat dissipation system 13 comprises a heat conductive sheet 131 and a heat pipe heat exchange sheet 132. The heat pipe heat exchange sheet 132 is fixedly arranged on the top of the battery pack 12 through the heat conductive sheet 131, and at least one heat pipe connecting interface 133 is arranged in the middle of the heat pipe heat exchange sheet 132. Each heat pipe connecting interface 133 is connected with the pipeline of the liquid cooling plate 1.

[0046] Preferably, the heat conductive sheet 131 is arranged at the middle part of the battery pack 12, and the area of the heat conductive sheet 131 is 1-99% of the area of the upper surface of the battery pack 12, and the area is preferably 30% of the area of the upper surface of the battery pack 12. The thickness of the heat conductive sheet 131 is 2 mm.

[0047] Preferably, the heat conductive sheet 131 is arranged at the middle part of the battery pack 12, and the area of the heat conductive sheet 131 is 1-99% of the area of the upper surface of the battery pack 12, and the area is preferably 30% of the area of the upper surface of the battery pack 12. The thickness of the heat conductive sheet 131 is 2 mm.

[0048] Preferably, the material of the heat conductive sheet 131 can be a graphite-based heat dissipation pad or a silica gel heat dissipation pad.

[0049] Preferably, the heat conductive sheet 131 is arranged at the middle part of the battery pack 12, and the area of the heat conductive sheet 131 is 1-99% of the area of the upper surface of the battery pack 12, and the area is preferably 30% of the area of the upper surface of the battery pack 12. The thickness of the heat conductive sheet 131 is 2 mm.

[0050] Preferably, the heat pipe heat exchange sheet 132 is arranged at the middle part of the heat conductive sheet 131, and the area of the heat pipe heat exchange sheet 132 is 1-99% of the area of the heat conductive sheet 131, and the area is preferably 30% of the area of the heat conductive sheet 131.

[0051] Preferably, as shown in Figure 3As shown, the liquid cooling plate 2 comprises a liquid cooling plate shell 21, a serpentine liquid cooling pipe 22, a liquid cooling plate inlet 23, a liquid cooling plate outlet 24, one or more heat pipe heat exchange heads 25, heat pipe lines 26, and electromagnetic valves. The serpentine liquid cooling pipe 22 is arranged in the liquid cooling plate shell 21, and the two ends of the serpentine liquid cooling pipe 22 are respectively connected with the liquid cooling plate inlet 23 and the liquid cooling plate outlet 24. The refrigerant enters from the liquid cooling plate inlet 23, passes through the serpentine liquid cooling pipe 22, and then flows out from the liquid cooling plate outlet 24, thereby completing the heat exchange in the battery cluster 5. One end of each heat pipe line 26 is respectively connected with the serpentine liquid cooling pipe 22 through each heat pipe heat exchange head 25 which is partially integrated in the liquid cooling plate 2. The other end of each heat pipe line 26 is connected with the heat pipe connection interface 133 in the heat pipe auxiliary cooling system 13. Each heat pipe heat exchange head 25 and the heat pipe connection interface 133 are controlled by electromagnetic valves, and the electromagnetic valves are controlled by the control circuit in the battery integrated cover plate 3.

[0052] Preferably, the liquid cooling plate shell 21 is made of stainless steel. More preferably, in the present embodiment, the stainless steel with a thickness of 5 mm is used.

[0053] Preferably, the diameter of the serpentine liquid cooling pipe 22 is 1-50 mm, and the present application preferably is 30 mm.

[0054] Preferably, the liquid cooling medium in the serpentine liquid cooling pipe 22 is a mixed solution of ethylene glycol and water with different volume ratios, and the present application does not limit this.

[0055] Preferably, the top of the heat pipe heat exchange head 25 is a hemispherical structure with a diameter of 1-20 mm, and the present application preferably is 10 mm. The heat pipe heat exchange head 25 serves as an electromagnetic valve opening channel and needs to be opened when heat safety is required. When the battery pack is immersed, the fire-fighting mode is realized.

[0056] Preferably, the battery integrated cover plate 3 is designed in an integrated manner, which comprises a cover plate shell 31, a conductive connecting piece 32, a first polarity interface 33, a second polarity interface 34, and a control circuit. The cover plate shell 31 is partially hollowed out corresponding to the terminal of each single cell in the battery pack 12, and the series / parallel connection of each single cell in the battery pack is realized through the built-in conductive connecting piece 32. The first polarity interface 33 and the second polarity interface 34 are arranged at both ends of the cover plate shell 31, and are used to lead out the current in the battery pack 12. The control circuit is used to collect the surface temperature and voltage of the battery pack 12, and to control the on-off state of the battery cluster circuit and the state of the lines of the liquid cooling plate 2 and the heat pipe auxiliary cooling system 13 according to the collected data.

[0057] Preferably, the control circuit comprises a temperature sensor, a voltage sensor, an alarm and a CTR (cell-to-battery cluster integrated mode) battery cluster control unit. The temperature sensor and the voltage sensor are used to collect the temperature of the battery surface and the voltage data on the battery terminal respectively, and send them to the CTR battery cluster control unit; the CTR battery cluster control unit is used to automatically cut off the entire battery cluster circuit and alarm when the collected temperature and voltage data meet the alarm condition, and open the electromagnetic valve in the liquid cooling plate 2 to exchange heat with the battery cluster 1 by using the refrigerant in the liquid cooling plate 2 when the alarm cannot be solved.

[0058] Preferably, the cover plate shell 31 is made of insulating material, for example, polyvinyl chloride (PVC) or polyethylene sulfate (PVS) material.

[0059] Embodiment 2

[0060] Based on the energy storage system provided in Embodiment 1, the safety control method of the energy storage system comprises the following steps:

[0061] S1, the battery integrated cover plate 3 collects the temperature and voltage data of the battery cluster 5, and automatically cuts off the entire battery cluster circuit and alarms when the temperature and voltage data meet the alarm condition.

[0062] S2, if the alarm cannot be solved, directly open the electromagnetic valve on the liquid cooling plate 2 and the heat pipe auxiliary heat dissipation system 13 within the preset time, and the refrigerant in the liquid cooling plate 2 quickly enters the battery cluster 5 to cool and block the heat spread.

[0063] Preferably, the above step S1 specifically comprises the following steps:

[0064] S11, the temperature sensor built-in the battery integrated cover plate 3 collects the temperature of the battery surface in the battery cluster, and the voltage sensor collects the voltage on the battery terminal, and transmits them to the CTR battery cluster control unit;

[0065] S12, the CTR battery cluster control unit judges the collected temperature and voltage data, and if the operating temperature of the battery surface is higher than the preset temperature value and the voltage drop rate is higher than the preset rate, it is automatically judged to cut off the entire battery cluster circuit and alarm.

[0066] Preferably, in the above step S12, when the CTR battery cluster control unit judges the collected temperature and voltage data:

[0067] The normal temperature collection range of the temperature sensor is 10-40℃, and the battery voltage is 3.65V. When the temperature collected by the temperature sensor exceeds 75℃, the temperature rise is ≥6℃ / s; or the voltage drop is ≥0.3V / s, the CTR battery cluster control unit automatically identifies as thermal runaway, and simultaneously opens the cut-off circuit command.

[0068] It should be pointed out finally that the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features therein can be replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An energy storage system, characterized by, include: Two or more liquid cooling plates and one or more battery clusters disposed between each pair of liquid cooling plates, wherein the liquid cooling plates and the battery clusters are assembled to form a multi-layer structure; Each of the battery clusters includes a battery cluster housing, a battery pack, a heat pipe-assisted heat dissipation system, and a battery integrated cover plate; The battery pack is fixedly installed inside the battery cluster housing with a front opening; The heat pipe-assisted heat dissipation system is located on the top of the battery pack and connected to the liquid cooling plate pipeline, and is used to perform liquid cooling heat dissipation on the battery pack. The battery integrated cover is disposed in front of the battery pack and electrically connected to the battery pack. The battery integrated cover is provided with a control circuit for collecting temperature and voltage data of the battery pack and controlling the liquid cooling plate and heat pipe auxiliary heat dissipation system according to the collection results. The heat pipe-assisted heat dissipation system includes a thermally conductive film and a heat pipe heat exchange plate; the heat pipe heat exchange plate is fixedly mounted on the top of the battery pack through the thermally conductive film, and at least one heat pipe connection interface is provided in the middle of the heat pipe heat exchange plate, and each heat pipe connection interface is connected to the liquid cooling plate pipeline above the battery pack. The liquid cooling plate includes a liquid cooling plate shell, a serpentine liquid cooling pipe, a liquid cooling plate inlet, a liquid cooling plate outlet, one or more heat pipe heat exchange heads, heat pipes, and solenoid valves. The serpentine liquid cooling pipe is disposed inside the liquid cooling plate shell, and its two ends are respectively connected to the liquid cooling plate inlet and the liquid cooling plate outlet. One end of each heat pipe is connected to the serpentine liquid cooling pipe via a heat pipe heat exchange head partially integrated inside the liquid cooling plate, and the other end of each heat pipe is connected to a corresponding heat pipe connection interface in the heat pipe auxiliary heat dissipation system. Each heat pipe heat exchange head and heat pipe connection interface is controlled by a solenoid valve, which is controlled by a control circuit within the battery integrated cover plate.

2. An energy storage system according to claim 1, wherein, The battery pack includes at least one battery cell. When it includes two or more battery cells, the battery cells are fixedly connected to each other by adhesive.

3. An energy storage system according to claim 2, wherein, Each of the battery cells includes at least one wound core or stacked core and a battery cell housing. When there are two or more wound cores or stacked cores, the wound cores or stacked cores are connected in series or in parallel, and the positive and negative terminals of each battery cell are uniformly located on the side of the battery cell.

4. The energy storage system of claim 1, wherein, The thermally conductive film is disposed in the middle part of the top of the battery pack, and the area of ​​the thermally conductive film is within 1% to 99% of the upper surface area of ​​the battery pack. The heat pipe heat exchange plate is disposed in the middle part of the thermally conductive film, and the area of ​​the heat pipe heat exchange plate is within 1% to 99% of the area of ​​the thermally conductive film.

5. The energy storage system of claim 1, wherein, The thermally conductive film is also provided with one or more raised heat dissipation particles, and each raised heat dissipation particle is evenly arranged on the thermally conductive film outside the heat pipe heat exchange plate.

6. An energy storage system according to claim 1, wherein, The battery integrated cover plate comprises a cover plate shell, a conductive connecting piece, a first polarity interface, a second polarity interface and a control circuit; a part of the cover plate shell is hollowed out corresponding to the connection terminals of each single battery cell in the battery pack, and the series or parallel connection of each single battery cell in the battery pack is realized through the built-in conductive connecting piece; the first polarity interface and the second polarity interface are arranged at both ends of the cover plate shell and are used for leading out the current in the battery pack; the control circuit is used for collecting the surface temperature and voltage of the battery pack and controlling the on-off state of the battery cluster circuit and the pipeline state of the liquid cooling plate and the heat pipe auxiliary cooling system according to the collected data.

7. An energy storage system according to claim 1, wherein, The control circuit comprises a temperature sensor, a voltage sensor and a CTR battery cluster control unit; the temperature sensor and the voltage sensor are respectively used for collecting the temperature of the surface of the battery pack and the voltage data on the battery terminal and sending to the CTR battery cluster control unit; the CTR battery cluster control unit is used for automatically cutting off the whole battery cluster circuit and alarming when the collected temperature and voltage data meet the alarm condition, and automatically opening the electromagnetic valve in the liquid cooling plate after a preset time to exchange heat with the battery pack by using the refrigerant in the liquid cooling plate.

8. A safety control method for the energy storage system according to any one of claims 1 to 7, characterized in that, The method comprises the following steps: The battery integrated cover plate collects the temperature and voltage data of the battery pack, automatically cuts off the whole battery cluster circuit and alarms when the temperature and voltage data meet the alarm condition; After a preset time, if the alarm cannot be solved, the electromagnetic valves on the liquid cooling plate and the heat pipe auxiliary cooling system are directly opened, and the battery cluster is cooled by using the refrigerant in the liquid cooling plate to block the heat spread.

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