Energy storage device

Abstract

Embodiments of the present disclosure provide an energy storage device, comprising a battery pack and a battery management unit. The battery pack comprises a battery case, a battery module, and a first isolation plate, the first isolation plate is sealedly connected to an opening of the battery case to form a sealed battery cavity, and the battery module is arranged in the sealed battery cavity. The battery management unit comprises a heat dissipation housing and a circuit board assembly arranged in the heat dissipation housing. The heat dissipation housing is connected to the battery case, the circuit board assembly, the first isolation plate, and the battery module are sequentially arranged at intervals, and a first vent port communicated with the sealed battery cavity is formed in the first isolation plate.

Description

Energy storage devices

[0001] Cross-references to related applications

[0002] This disclosure is based on and claims priority to Chinese patent application CN202410945752.9 entitled “Energy Storage Device”, filed on July 15, 2024, and incorporates the entire contents of that patent application by reference. Technical Field

[0003] This disclosure relates to the field of communication equipment, and more specifically, to an energy storage device. Background Technology

[0004] Communication equipment typically incorporates energy storage devices. In the event of unstable mains power supply or power outages, these devices serve as backup power sources, ensuring the normal operation of the communication equipment. This is particularly important in critical communication facilities (such as base stations and data centers), as they require the assurance of continuous and reliable communication services.

[0005] Energy storage devices mainly consist of two parts: the battery pack and the battery management unit. The battery management unit manages and regulates the power of the battery pack. If an unexpected thermal runaway occurs in a battery module within the battery pack, it will generate a large amount of heat, smoke, and electrolyte. Heat, smoke, and electrolyte will all affect the battery management unit, exacerbating the severity of the thermal runaway. If an abnormal short circuit occurs on the power circuit board within the battery management unit, it will produce abnormalities such as smoke, fire, and short-circuit arcing, while simultaneously generating a large amount of heat and radiation. This heat and radiation can cause thermal impact damage to surrounding structures, potentially affecting the safety of the battery pack. Therefore, effectively isolating the battery pack and the battery management unit to prevent mutual impact from thermal runaway is an important research direction in the industry.

[0006] However, communication equipment is often size-constrained and compact, limiting the space available for energy storage devices. For example, many energy storage devices are installed in 19-inch wide racks with strict limitations on depth and height. Therefore, space-saving and compact designs for energy storage devices are particularly important. In related technologies, the isolation between the battery pack and battery management unit in energy storage devices installed in compact spaces is poor, resulting in low safety, requiring further improvement and optimization. Summary of the Invention

[0007] Embodiments of this disclosure provide an energy storage device that achieves secure isolation between a battery pack and a battery management unit within a compact space.

[0008] The energy storage device in this embodiment includes a battery pack and a battery management unit. The battery pack includes a battery box, a battery module, and a first isolation plate. The first isolation plate and the opening of the battery box are sealed together to form a sealed battery cavity. The battery module is disposed in the sealed battery cavity. The battery management unit includes a heat dissipation housing and a circuit board assembly disposed in the heat dissipation housing. The heat dissipation housing is connected to the battery box. The circuit board assembly, the first isolation plate, and the battery module are arranged in sequence at intervals. The first isolation plate is provided with a first vent that communicates with the sealed battery cavity. Attached Figure Description

[0009] Figure 1 shows an exploded view of the energy storage device provided in an embodiment of this disclosure;

[0010] Figure 2 shows the assembly diagram of the battery management unit in Figure 1;

[0011] Figure 3 shows an exploded view of the battery management unit in Figure 2;

[0012] Figure 4 shows an assembly diagram of the battery pack in Figure 1;

[0013] Figure 5 shows a schematic diagram of the internal structure of the energy storage device provided in an embodiment of this disclosure.

[0014] The above-mentioned figures include the following reference numerals: 100, battery pack; 110, battery box; 111, chassis; 112, top cover; 120, battery module; 130, first isolation plate; 140, first vent; 150, wiring harness assembly; 200, battery management unit; 210, heat dissipation housing; 211, front panel; 212, side panel; 220, circuit board assembly; 230, second isolation plate; 240, second vent. Detailed Implementation

[0015] The technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this disclosure or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0016] As shown in Figures 1 to 5, an embodiment of this disclosure provides an energy storage device, including a battery pack 100 and a battery management unit 200. The battery pack 100 includes a battery box 110, a battery module 120, and a first isolation plate 130. The first isolation plate 130 and the opening of the battery box 110 are sealed together to form a sealed battery cavity. The battery module 120 is disposed in the sealed battery cavity. The battery management unit 200 includes a heat dissipation housing 210 and a circuit board assembly 220 disposed in the heat dissipation housing 210. The heat dissipation housing 210 is connected to the battery box 110. The circuit board assembly 220, the first isolation plate 130, and the battery module 120 are arranged sequentially at intervals. The first isolation plate 130 is provided with a first vent 140 communicating with the sealed battery cavity.

[0017] In this embodiment, the first isolation plate 130 serves as a heat insulation layer. When the battery module 120 or circuit board assembly 220 malfunctions and generates a large amount of heat, the first isolation plate 130 can prevent heat from spreading between the battery module 120 and the circuit board assembly 220, reducing mutual interference. Furthermore, by providing a first vent 140 in the first isolation plate 130, the heat, gas, dust, etc., generated when the battery module 120 malfunctions can be released and discharged at specific locations, preventing thermal runaway. This also facilitates the placement of directional thermal management and heat dissipation structures at appropriate locations, thus preventing mutual interference between the battery pack and the battery management unit, improving isolation effectiveness and safety. The first vent 140 can be configured as one or more as needed.

[0018] As shown in Figure 1, the battery management unit 200 also includes a second isolation plate 230. The second isolation plate 230 and the opening of the heat dissipation housing 210 are sealed together to form a sealed management cavity. The circuit board assembly 220 is disposed in the sealed management cavity. The circuit board assembly 220, the second isolation plate 230 and the first isolation plate 130 are arranged in sequence at intervals. The heat dissipation housing 210 and / or the second isolation plate 230 are provided with a second vent 240 that communicates with the sealed management cavity.

[0019] In this way, the first isolation plate 130 and the second isolation plate 230 work together to provide heat insulation. When the battery module 120 or circuit board assembly malfunctions and generates a large amount of heat, the heat can be prevented from spreading between the two, reducing mutual influence. Moreover, by setting multiple vents in the first isolation plate 130 of the battery pack 100 and the heat dissipation shell 210 and the second isolation plate 230 in the battery management unit, the heat, gas, dust and other substances generated when the battery module 120 or circuit board assembly 220 malfunctions can be released and discharged in specific locations to avoid thermal runaway. It also facilitates the setting of directional thermal management heat dissipation structures in corresponding locations, which also avoids mutual influence between the battery pack and the battery management unit, further improving the isolation effect and safety.

[0020] In this embodiment, the heat dissipation housing 210 and the battery box 110 are fixedly connected by bolts or other fasteners, and there is an assembly gap between them after connection. The heat, gas, dust, etc. discharged from the first vent 140 or the second vent 240 can be discharged to the outside of the energy storage device through the assembly gap between the heat dissipation housing 210 and the battery box 110 or other set positions to avoid thermal runaway.

[0021] To further enhance safety, fire-fighting devices can be installed outside the energy storage device. When smoke or fire is detected emanating from the energy storage device, the fire-fighting device can promptly extinguish the fire or isolate the energy storage device to prevent it from affecting other equipment.

[0022] In the battery management unit 200, one or more second discharge ports 240 can be provided, and the location of the second discharge ports 240 can be selected as needed. For example, one or more second discharge ports 240 can be provided on the second isolation plate 230 alone; or one or more second discharge ports 240 can be provided on the heat dissipation housing 210 alone; or one or more second discharge ports 240 can be provided on both the second isolation plate 230 and the heat dissipation housing 210.

[0023] In this embodiment, the circuit board assembly 220 includes a battery management module and a power circuit board. In other embodiments not shown, other functional modules may also be included in the circuit board assembly 220.

[0024] As shown in Figures 2 and 3, an embodiment is provided with a second vent 240 on both the heat dissipation housing 210 and the second isolation plate 230. The second isolation plate 230 has at least one second vent 240 in the middle, for example, two second vents 240 in the middle. The heat dissipation housing 210 has a front panel 211 and a plurality of side plates 212 surrounding the front panel 211. The front panel 211 and the second isolation plate 230 are arranged opposite to each other. The circuit board assembly 220 is located between the front panel 211 and the second isolation plate 230. At least one end of the front panel 211 in the length direction is provided with at least one second vent 240, and at least one side plate 212 is provided with at least one second vent 240.

[0025] By setting multiple second vents 240 at specific locations on the second isolation plate 230 and the heat sink 210, when the power circuit board short-circuits and generates a large amount of heat, the heat, gas, dust, etc. can be released and discharged at specific locations, thus achieving effective thermal management.

[0026] The front panel 211 has multiple fins arranged side by side, which are used to dissipate some of the heat from the battery management unit 200.

[0027] In some embodiments, the length direction of the second isolation plate 230 is horizontal, the width direction of the second isolation plate 230 is vertical, and at least one second vent 240 is provided on each of the two sides along the length direction of the second isolation plate 230, and at least one second vent 240 is provided on the upper edge of the second isolation plate 230, so that heat can be discharged more quickly.

[0028] At least two of the multiple second vent ports 240 have different sizes and / or shapes, such as rectangular, circular, elliptical, semi-circular, or semi-elliptical. Each second vent port 240 can relieve pressure and also serve other functions. For example, one second vent port 240 located in the middle of the second isolation plate 230 also serves as a positive and negative input port for the battery management module, while at least one second vent port 240 located elsewhere also serves as a cable passage. The cables that pass through can be heating wires, dry contact wires, voltage and temperature signal wires, etc.

[0029] As shown in Figure 4, at least one first vent 140 is provided in the middle of the first isolation plate 130, and at least one first vent 140 is provided on the upper edge of the first isolation plate 130. When the battery cell in the battery module 120 burns, heat, gaseous dust, electrolyte, etc. can be released and discharged in specific locations to achieve effective thermal management and improve safety.

[0030] In some embodiments, the length direction of the first isolation plate 130 is horizontal, the width direction of the first isolation plate 130 is vertical, at least one first vent 140 is provided on the lower edge of the first isolation plate 130, and at least one first vent 140 is provided on both sides of the length direction of the first isolation plate 130, so that heat and other substances can be discharged more quickly.

[0031] In one exemplary embodiment, at least two of the plurality of first vent ports 140 have different sizes and / or shapes, such as rectangular, circular, elliptical, semi-circular, semi-elliptical, etc. Each first vent port 140 can relieve pressure and may also serve other functions simultaneously. For example, one first vent port 140 located in the middle of the first isolation plate 130 also serves as a positive and negative output port for the battery module 120, at least one first vent port 140 located at the lower edge of the first isolation plate 130 also serves as a flammable liquid discharge port, and at least one first vent port 140 located at other positions also serves as a cable passage port. The cables that pass through can be heating wires, dry contact wires, voltage and temperature signal wires, etc.

[0032] In one exemplary embodiment, the periphery of the first isolation plate 130 and the periphery of the opening of the battery box 110 are sealed together by adhesive or sealing strip, or the periphery of the first isolation plate 130 and the periphery of the opening of the battery box 110 are interference-fitted; the periphery of the second isolation plate 230 and the periphery of the opening of the heat dissipation housing 210 are sealed together by adhesive or sealing strip, or the periphery of the second isolation plate 230 and the periphery of the opening of the heat dissipation housing 210 are interference-fitted.

[0033] The above assembly method achieves a sealed connection between the first isolation plate 130 and the battery box 110, and a sealed connection between the second isolation plate 230 and the heat dissipation shell 210, which can prevent the passage of combustion flames, gases or dust caused by short circuits, capacitor valve opening, etc.

[0034] In some embodiments, the battery box 110 includes a chassis 111 and a top cover 112, the top cover 112 covering the upper opening of the chassis 111. The battery pack 100 also includes a wiring harness assembly 150, which is located between the top cover 112 and the battery module 120. Multiple cells in the battery module 120 are electrically connected to the wiring harness assembly 150, and the wiring harness assembly 150 is electrically connected to the circuit board assembly 220.

[0035] In one exemplary embodiment, all or part of the first isolation plate 130 is a composite material plate, and / or all or part of the second isolation plate 230 is a composite material plate, wherein the composite material plate has a multi-layer structure.

[0036] That is, the first isolation plate 130 can be entirely or partially made of multi-layer composite material, and the second isolation plate 230 can be a non-composite material plate; or the second isolation plate 230 can be entirely or partially made of multi-layer composite material, and the first isolation plate 130 can be a non-composite material plate; or both the first isolation plate 130 and the second isolation plate 230 can be entirely or partially made of multi-layer composite material. In this case, the materials and thicknesses of the first isolation plate 130 and the second isolation plate 230 can be the same or different.

[0037] The second insulating plate 230 can block the arc heat radiation generated by abnormal short circuits in the battery management module and power circuit board. The thickness of the power circuit board is generally around 2.5mm. Tests have verified that the arc erosion rate of a 200A power circuit short-circuit is between 0.1mm / s and 1mm / s. If the medium 5mm away from the power circuit board can withstand the arc radiation damage within a range of 5-15mm without being broken down, it can effectively block the damage caused by the short circuit arcing of the circuit board. Tests have shown that when the second insulating plate 230 is partially or entirely made of a composite material, arc blocking can be achieved. Using all or part of the first insulating plate 130 as a composite material can also improve the heat insulation effect.

[0038] The composite material panel includes a base layer and a reinforcing layer. At least one side of the base layer has at least one reinforcing layer. The base layer is made of metal or mica, and the reinforcing layer is made of mica, metal oxide, or ceramic. This structural design provides heat insulation and radiation resistance.

[0039] Among them, the mica is dense mica, the metal oxide layer can be laser cladding dense WC coating, etc., and the ceramic layer can be ZrC-SiC-BN / BPR, etc.

[0040] Depending on the application requirements, the reinforcing layers can be set to 1 to 4 layers. For example, a composite material board includes one reinforcing layer, with one reinforcing layer on one side of the base layer; or, a composite material board includes two reinforcing layers, both of which are located on one side of the base layer; or, a composite material board includes two reinforcing layers, with two reinforcing layers located on both sides of the base layer; or, a composite material board includes three reinforcing layers, with two reinforcing layers located on one side of the base layer and one reinforcing layer located on the other side of the base layer; or, a composite material board includes four reinforcing layers, with two reinforcing layers on each side of the base layer.

[0041] In one exemplary embodiment, the thickness of the base layer is 0.5-3mm, and the thickness of the reinforcing layer is 0.5-3mm. If the thickness is less than 0.5mm, the isolation effect is poor; if the thickness is greater than 3mm, it is unnecessary and wastes materials. In this embodiment, the thicknesses of the base layer and the reinforcing layer are set within the above ranges, which can ensure the isolation effect while also taking into account production costs.

[0042] In one exemplary embodiment, in the first isolation plate 130, the base layer is made of metal, which has better heat insulation effect and can block the heat released by the battery module from being transferred to the battery management unit; in the second isolation plate 230, the base layer is made of mica, which has better radiation isolation effect and can block the radiation of the circuit board assembly from being transferred to the battery pack.

[0043] In one exemplary embodiment, the distance between the second isolation plate 230 and the circuit board assembly 220 is 3-8 mm, and the distance between the second isolation plate 230 and the first isolation plate 130 is 5-30 mm. Limiting the distances between the second isolation plate 230 and the circuit board assembly 220, and between the second isolation plate 230 and the first isolation plate 130, to the aforementioned ranges achieves good isolation while avoiding excessively large gaps that would occupy space. The energy storage device provided in this embodiment has a compact structure and can be installed in compact spaces, such as in a 19-inch rack-mount cabinet or a similarly sized rack.

[0044] To clearly understand the content of the embodiments, further explanation is provided below.

[0045] The battery pack in the energy storage module consists of a battery module 120, a chassis 111, a top cover 112, a wiring harness assembly 150, and a first isolation plate 130. The battery management section includes a battery management module and a power circuit board. The wiring harness assembly connects the cells inside the battery module 120 in series and parallel, transferring energy to the battery management module and power circuit board through positive and negative output terminals. The battery management module and power circuit board perform power conversion and then transfer the energy to an external load through a heat sink 210. In the event of accidental thermal runaway of a cell, a large amount of heat, smoke, and electrolyte will be generated. Heat, smoke, and electrolyte will all affect the battery management section, exacerbating the severity of thermal runaway. The power circuit board can perform power conversion on the battery module's voltage—that is, boosting and bucking it before outputting it to the outside of the battery pack. The power circuit board contains power devices, which generate heat during operation and require heat dissipation through the heat sink 210 to ensure the normal operation and reasonable lifespan of the battery pack. When a power circuit board experiences an abnormal short circuit, it may produce abnormalities such as smoke, fire, and short-circuit arcing discharge. At the same time, it will generate a large amount of heat and radiation, which may cause thermal damage to the surrounding structure and affect the safety of the battery cell.

[0046] In the event of thermal runaway of the battery management module, power circuit board, or battery module, the solution of this disclosure embodiment can ensure minimal thermal impact between the battery management module / power circuit board and the battery module 120. When the power circuit board is short-circuited, the heat generated will be released through specific vents, preventing flames or other contaminants from being projected onto the cell area and further causing thermal runaway. When the battery module is short-circuited, the heat generated will be released through specific vents, preventing flames or other contaminants from being projected onto critical areas of the battery management module and power circuit board and further causing thermal runaway.

[0047] The first isolation plate 130 and the second isolation plate 230 are radiation resistant. Through material and thickness design, they can isolate thermal effects and resist arc damage within a specific distance, preventing arc energy from reaching the battery pack. This specific distance effectively ensures efficient space utilization within the battery pack. When thermal runaway occurs at a location within the battery module, a large amount of heat and flammable liquid will be generated in a short time. The directional sealing of the first isolation plate 130 and the second isolation plate 230 effectively isolates the heat and flammable liquid from further damaging the battery management module and power circuit board, effectively ensuring the switching control functions of the battery management module and power circuit board.

[0048] The electric arc generated by a short circuit in the battery management module and power circuit board is a discharge phenomenon characterized by concentrated energy, high temperature, and intense brightness. For example, with a short-circuit current of 20-120A from a 48V DC power supply, the temperature within 5mm of the arc can reach over 2500℃, and within 15mm, it can reach over 1200℃. This causes intense physicochemical changes in the medium and surrounding area, easily burning out other nearby components and triggering system thermal runaway. The second isolation plate 230 is close to the battery management module and power circuit board and needs to withstand the arc damage generated by the circuit board. Experiments have verified that appropriately thick, dense phlogopite, oxide coatings, and nano-ceramics can withstand a certain amount of arc damage within an arc distance of 3-8mm, ensuring that the ionized layer does not penetrate the isolation plate and reach the battery module surface. In this embodiment, the arc thermal effect is weaker in the space beyond 25mm from the circuit board arc, and can be isolated using a regular isolation plate; however, a wider distance would waste product space.

[0049] In circuit board assembly 220, the main functions of the battery management module and power circuit board are generally achieved through the PCB board to control power electronics. PCB products that monitor the status of the battery pack, manage its functions, and perform power conversion need to operate frequently within a specified time to complete their designated functions during normal operation. Instability in the reliability of the PCB will lead to frequent system failures. The DC arc generated when the PCB overheats and its insulation fails cannot be extinguished in the energy storage device by changing the distance of the arc initiation point or by absorbing the arc. Once an arc discharge occurs, the PCB will experience a chain reaction, burning the surrounding components. The battery module 120 will maintain a continuous high-power DC arc discharge, and the radiation generated by the arc core is similar to blackbody radiation. Within a short distance (10mm) of the DC arc core, general insulation or metal materials cannot withstand the damage of the arc and can be quickly melted through. When the PCB is too close to the battery module 120, the arc it generates can easily cause thermal runaway of the battery cells. The above-mentioned settings achieve reliable isolation and short-circuit protection between the battery module 120 and the circuit board assembly 220.

[0050] In this embodiment, the battery module 120 can be a lithium battery. Lithium batteries are excellent energy storage units, characterized by high power and high energy density. Thermal runaway during abnormal operation is characterized by a rapid heat release rate and a wide thermal impact range, accompanied by the release of large amounts of heat, smoke, and flammable liquids. An effective sealing structure and directional vents can control the damage to other devices and structures in the external environment caused by the lithium battery under thermal runaway conditions. Furthermore, the heat released during thermal runaway can be directed in a pre-designed direction, which is beneficial for fire protection arrangements.

[0051] The energy storage device provided in this embodiment has the advantages of small size and good safety protection. It can ensure that the short-circuit discharge heat after the power control circuit fails does not affect the safety of the battery. It provides a safe and reliable solution to the thermal sensitivity of lithium batteries and the vulnerability of power circuits, improves the safety of lithium battery systems and extends the service life of lithium batteries.

[0052] This embodiment significantly improves the thermal safety of the battery system through extreme size design and innovative application of special materials. It can reduce property damage to the cabinet and power distribution environment where the product is located due to misuse.

[0053] In this energy storage device, the battery module 120, composed of one or more cells connected in series and parallel, serves as the energy storage carrier. The battery box 110 is used to fix the battery module 120, providing structural support, electrical protection, and a handling and hoisting point for the battery module 120. Simultaneously, the battery box 110 serves as the heat exchange interface between the battery module 120 and the external environment. In the event of thermal runaway of the battery management module, power circuit board, or battery module 120, this embodiment can ensure minimal thermal impact between the battery management module / power circuit board and the battery module 120.

[0054] When the battery management module is short-circuited, the heat it generates will be released through a specific vent, preventing flames from being sprayed onto the battery module 120 area and causing further thermal runaway of the battery cell. When the battery module 120 is short-circuited, the heat it generates will be released through a specific vent, preventing flames from being sprayed onto the critical areas of the battery management module and power circuit board and causing further thermal runaway of the battery cell.

[0055] The energy storage device provided in this embodiment is mainly used in the battery subsystem within a 19-inch rack-mount power system. The battery subsystem can perform charge / discharge power conversion within a certain range according to the voltage, current, and power requirements of the load and DC source. In power matching applications, it can be used independently or in parallel. The 19-inch rack-mount cabinet has strict limitations on depth and height, resulting in limited internal space. This embodiment achieves mutual isolation between the battery pack 100 and the battery management unit 200 within this limited space.

[0056] The above description is merely an optional embodiment of this disclosure and is not intended to limit this disclosure. For those skilled in the art, various modifications and variations can be made to the embodiments of this disclosure. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the embodiments of this disclosure should be included within the protection scope of this disclosure.

[0057] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0058] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of this disclosure. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as exemplary only and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0059] In the description of the embodiments of this disclosure, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the embodiments of this disclosure and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this disclosure; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0060] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0061] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this disclosure.

Claims

1. An energy storage device, comprising a battery pack (100) and a battery management part (200), the battery pack (100) comprising a battery box (110), a battery module (120) and a first isolation plate (130), the first isolation plate (130) and an opening of the battery box (110) being sealingly connected to form a sealed battery cavity, the battery module (120) being arranged in the sealed battery cavity, the battery management part (200) comprising a heat dissipation shell (210) and a circuit board group (220) arranged in the heat dissipation shell (210); wherein, The heat dissipation shell (210) is connected with the battery box (110), the circuit board group (220), the first isolation plate (130) and the battery module (120) are sequentially and spacedly arranged, and the first isolation plate (130) is provided with the first discharge port (140) communicated with the sealed battery cavity.

2. The energy storage device according to claim 1, wherein the battery management unit (200) further comprises a second isolation plate (230), the second isolation plate (230) and the opening of the heat dissipation shell (210) are sealingly connected to form a sealed management cavity, and the circuit board group (220) is arranged in the sealed management cavity; the circuit board group (220), the second isolation plate (230) and the first isolation plate (130) are sequentially and spacedly arranged, and the heat dissipation shell (210) and / or the second isolation plate (230) is provided with the second discharge port (240) communicated with the sealed management cavity.

3. The energy storage device of claim 2, wherein, In the case that the second discharge port (240) is arranged on the heat dissipation shell (210) and the second isolation plate (230), at least one second discharge port (240) is arranged on the middle part of the second isolation plate (230), the heat dissipation shell (210) has a front panel (211) and a plurality of side panels (212) surrounding the front panel (211), the front panel (211) and the second isolation plate (230) are oppositely arranged, the circuit board group (220) is located between the front panel (211) and the second isolation plate (230), at least one second discharge port (240) is arranged on at least one end of the front panel (211) in the length direction, and at least one second discharge port (240) is arranged on at least one side panel (212).

4. The energy storage device of claim 3, wherein, The length direction of the second isolation plate (230) is the horizontal direction, the width direction of the second isolation plate (230) is the vertical direction, at least one second discharge port (240) is arranged on the two edges of the second isolation plate (230) in the length direction, and at least one second discharge port (240) is arranged on the upper edge of the second isolation plate (230).

5. The energy storage device of claim 4, wherein, The circuit board group (220) comprises a battery management module and a power circuit board, one second discharge port (240) arranged on the middle part of the second isolation plate (230) is also used as a positive / negative electrode input passage of the battery management module, and at least one second discharge port (240) arranged at other positions is also used as a cable passing passage.

6. The energy storage device of claim 1, wherein, At least one first discharge port (140) is arranged on the middle part of the first isolation plate (130), and at least one first discharge port (140) is arranged on the upper edge of the first isolation plate (130).

7. The energy storage device of claim 6, wherein, The length direction of the first isolation plate (130) is horizontal direction, the width direction of the first isolation plate (130) is vertical direction, at least one first discharge port (140) is arranged at the lower edge of the first isolation plate (130), and at least one first discharge port (140) is arranged at the two edges of the length direction of the first isolation plate (130).

8. The energy storage device of claim 7, wherein, One first discharge port (140) located at the middle of the first isolation plate (130) also serves as a positive and negative electrode output port of the battery module (120), at least one first discharge port (140) located at the lower edge of the first isolation plate (130) also serves as a combustible liquid discharge port, and at least one first discharge port (140) located at other positions also serves as a cable passing port.

9. The energy storage device of claim 2, wherein, The periphery of the first isolation plate (130) and the opening periphery of the battery box (110) are connected by glue or sealing strip, or the periphery of the first isolation plate (130) and the opening periphery of the battery box (110) are interference fit; the periphery of the second isolation plate (230) and the opening periphery of the heat dissipation shell (210) are connected by glue or sealing strip, or the periphery of the second isolation plate (230) and the opening periphery of the heat dissipation shell (210) are interference fit.

10. The energy storage device of claim 1, wherein, The battery box (110) comprises a cabinet (111) and an upper cover (112), the upper cover (112) covers the upper opening of the cabinet (111), the battery pack (100) further comprises a wiring board group (150), the wiring board group (150) is located between the upper cover (112) and the battery module (120), a plurality of battery cells in the battery module (120) are electrically connected with the wiring board group (150), and the wiring board group (150) is electrically connected with the circuit board group (220).

11. The energy storage device of claim 2, wherein, All or part of the first isolation plate (130) is a composite material plate, and / or all or part of the second isolation plate (230) is a composite material plate, and the composite material plate is a multi-layer structure.

12. The energy storage device of claim 11, wherein, The composite material plate comprises a base layer and a reinforcing layer, at least one side of the base layer is provided with at least one reinforcing layer, the material of the base layer is metal or mica, and the material of the reinforcing layer is mica or metal oxide or ceramic.

13. The energy storage device of claim 12, wherein, The composite material plate comprises one reinforcing layer, and one side of the reinforcing layer is arranged on one side of the base layer; or the composite material plate comprises two reinforcing layers, and the two reinforcing layers are arranged on one side of the base layer; or the composite material plate comprises two reinforcing layers, and the two reinforcing layers are arranged on two sides of the base layer; or the composite material plate comprises three reinforcing layers, wherein two reinforcing layers are arranged on one side of the base layer, and one reinforcing layer is arranged on the other side of the base layer; or the composite material plate comprises four reinforcing layers, and two reinforcing layers are arranged on two sides of the base layer.

14. The energy storage device of claim 12, wherein, The thickness of the base layer is 0.5-3mm, and the thickness of the reinforcing layer is 0.5-3mm.

15. The energy storage device of claim 12, wherein, In the first isolation plate (130), the material of the base layer is metal; in the second isolation plate (230), the material of the base layer is mica.

16. The energy storage device of claim 2, wherein, The distance between the second isolation plate (230) and the circuit board group (220) is 3-8 mm, and the distance between the second isolation plate (230) and the first isolation plate (130) is 5-30 mm.

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