Energy storage device with combiner box

Abstract

The invention discloses an energy storage device with a combiner box, and the main points of the technical scheme are that the combiner box comprises a box body and a cover body which are sealed and covered with each other, and also comprises an inner heat-conducting fin arranged on the inner surface of the cover body, the inner heat-conducting fin is located above a component in the box body, and a distance is kept between the inner heat-conducting fin and the component; the frame body is used for inserting the combiner box and supports the bottom of the box body; the elastic heat-conducting fin is fixed on the frame body and abuts against the outer surface of the cover body to vertically clamp and fix the cover body and the box body, and the elastic heat-conducting fin accelerates outward heat dissipation of the cover body, so that the inner heat-conducting fin is arranged at the inner top of the combiner box, heat transfer to the cover body is accelerated, and heat diffusion to the outside is accelerated by matching with the elastic heat-conducting fin abutting against the top; therefore, the purpose that the combiner box rapidly dissipates heat outwards in a sealed environment is improved.

Description

Technical Field

[0001] The present invention relates to an energy storage device, and more specifically, to an energy storage device with a combiner box. Background Technology

[0002] Energy storage devices are used to provide power; it is existing technology for energy storage devices to use two or more battery clusters connected in parallel and connected to a combiner cabinet.

[0003] For example, Chinese patent application CN114079301A, entitled "Energy Storage System and Current Regulation Method," provides a solution that connects two or more parallel battery clusters to a combiner cabinet.

[0004] The heat in a combiner box originates from the power losses of its internal components, which follow Joule's law. The superposition of currents (two inputs and one output) means that the two input currents merge into one output current. This increases the current density in the output side's wires, circuit breakers, and other components, leading to increased power losses and consequently, a rise in the internal temperature of the combiner box. Overheating inside the junction box can cause overheating and arcing, so the junction box needs good heat dissipation performance; However, the junction box must maintain good sealing to protect against dust and particulate matter from intrusion. Impurities will adhere to the surface of components such as contactors, fuses, and terminals, leading to increased contact resistance and reduced heat dissipation efficiency. Long-term accumulation may also cause short circuits or component burnout. Therefore, the existence of junction boxes has a long-standing technical problem: how to improve the heat dissipation performance inside sealed junction boxes. Summary of the Invention

[0005] The purpose of this invention is to provide an energy storage device with a junction box. An inner heat-conducting plate is provided on the inner top of the junction box to accelerate the transfer of heat to the cover. In conjunction with the elastic heat-conducting plate that abuts the top, the heat is accelerated to diffuse to the outside, thereby improving the purpose of the junction box to dissipate heat quickly to the outside in a sealed environment.

[0006] The above-mentioned technical objective of the present invention is achieved through the following technical solution: An energy storage device with a junction box, the junction box including a box body and a cover body that are sealed to each other, and further including: an inner heat-conducting sheet disposed on the inner surface of the cover body, the inner heat-conducting sheet being located above the components inside the box body and maintaining a distance from the components; a frame for inserting the junction box, the frame body supporting the bottom of the box body; and an elastic heat-conducting sheet fixed to the frame body, the elastic heat-conducting sheet abutting against the outer surface of the cover body to achieve upper and lower clamping and fixing of the cover body and the box body, and the elastic heat-conducting sheet accelerating the heat dissipation of the cover body outward.

[0007] Preferably, there are heat dissipation gaps between the elastic heat-conducting sheets.

[0008] Preferably, the frame is equipped with a cooling fan, and the elastic heat-conducting fins are located on the airflow channel of the cooling fan.

[0009] Preferably, the inner heat-conducting sheet consists of a longitudinal heat-conducting sheet and a transverse heat-conducting sheet, which are cross-fixed to the cover to reinforce the cover.

[0010] Preferably, the end of the elastic heat-conducting sheet is provided with an upward-curving arc-shaped piece, which is oriented toward the insertion direction of the junction box to facilitate the insertion of the junction box into the frame.

[0011] Preferably, the box body is provided with air holes, and a memory cover is fixed to the edge of the air holes; when the temperature is greater than or equal to the temperature threshold of the memory cover, the memory cover bends to open the air holes; when the temperature is less than the temperature threshold of the memory cover, the memory cover resets and seals the air holes.

[0012] Preferably, a sealing rubber strip is fixed to the edge of the memory cover; when the memory cover seals the air hole, the sealing rubber strip adheres to the box body.

[0013] Preferably, the vent is located on the side of the box body, and the lower end of the memory cover and the lower edge of the vent are fixed; when the memory cover is opened, the memory cover bends into the box body to form a heat conduction state.

[0014] Preferably, the elastic thermal conductive sheet includes a heat dissipation surface that conforms to the cover.

[0015] Preferably, the junction box connects two battery clusters.

[0016] In summary, the present invention has at least one of the following beneficial effects: The junction box uses an internal heat-conducting plate built into the top to accelerate the dissipation of heat from the top, which, together with the elastic heat-conducting plate of the frame, forms an integrated fast heat conduction channel, improving the heat dissipation performance of the junction box under sealing. Secondly, the built-in internal heat-conducting fins prevent the outer surface of the junction box from maintaining a traditional flatness. If the heat dissipation fins are fixed to the outer surface of the junction box, workers are easily scratched by the external fixed fins during handling and installation. Therefore, this heat dissipation layout improves the efficiency of heat dissipation using heat-conducting plates while ensuring the sealing of the junction box and the flatness of the outer surface of the junction box. It also relies on the elastic compression performance of the elastic heat-conducting plates to form an external force on the junction box of the energy storage device to fix its installation position.

[0017] Furthermore, the memory cover is made of metal, which will deform under temperature changes. In this solution, the memory cover has a temperature threshold. When the temperature of the memory cover is greater than or equal to the temperature threshold, it opens upward to ventilate and dissipate heat. When the hot air flows downward from the top, the inward tilting memory cover accelerates the hot air flow outward. When the temperature of the memory cover is less than the temperature threshold, it closes. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the front of the energy storage device in the embodiment; Figure 2 This is a rear view of the energy storage device in the embodiment; Figure 3 This is a schematic diagram of the junction box and the elastic heat-conducting sheet being mounted in contact with the frame in the embodiment; Figure 4 This is an exploded view of the box and lid in the embodiment. Figure 1 ; Figure 5 This is an exploded view of the box and lid in the embodiment. Figure 2 ; Figure 6 This is a schematic diagram showing the vertical positions of the internal heat-conducting plates and components after the junction box is cut open in the embodiment; Figure 7 This is a schematic diagram showing the distribution of the elastic heat-conducting sheets in the embodiment; Figure 8 This is a schematic diagram of the elastic heat-conducting sheet being fixed to the frame in the embodiment; Figure 9 This is a schematic diagram of the memory cover when it is closed on the side wall of the box in the embodiment; Figure 10 This is a schematic diagram of the memory cover opening on the side wall of the box in the embodiment; Figure 11 This is a schematic diagram of hot air flowing out of the vent in the embodiment; Figure 12 This is a schematic diagram of the electrical connection between the battery cluster and the combiner box in the embodiment.

[0019] In the picture: 01. Cabinet; 1. Combiner box; 11. Box body; 12. Cover; 2. Internal heat-conducting plate; 21. Longitudinal heat-conducting plate; 22. Transverse heat-conducting plate; 3. Components; 4. Frame; 5. Flexible heat-conducting sheet; 51. Arc-shaped sheet; 52. Heat dissipation surface; 6. Heat dissipation gap; 7. Cooling fan; 8. Stomata; 9. Memory cover; 91. Sealing rubber strip; 10. Battery clusters. Detailed Implementation

[0020] The present invention will be further described in detail below with reference to the accompanying drawings.

[0021] Example 1: An energy storage device with a combiner box, referring to... Figure 1It includes cabinet 01, which contains battery units, liquid coolers, PCs, combiner box 1, high voltage box, etc.

[0022] The cabinet 01 is welded with a metal frame 4. The junction box 1 is rectangular in shape. The junction box 1 is inserted into the frame 4 from the front of the cabinet 01, and the frame 4 supports the junction box 1.

[0023] An airflow channel is formed between the top of the manifold 1 and the frame 4, and the airflow generated by the cooling fan 7 can flow along the channel through the elastic heat-conducting sheet 5.

[0024] Reference Figure 2 A cooling fan 7 is installed on the back of the cabinet 01. The cooling fan 7 is fixed on the frame 4 and blows air to cool the junction box 1.

[0025] Reference Figure 3 The installation relationship between frame 4 and junction box 1 is as follows.

[0026] The frame 4 is made of welded metal rods. The frame 4 includes two vertical rods. Ear plates are fixed on both sides of the combiner box 1. The ear plates are placed on the vertical rods to control the insertion depth of the combiner box 1 in the frame 4.

[0027] Secondly, there is a gap between the top of the frame 4 and the junction box 1, and an elastic heat-conducting sheet 5 is welded to the frame 4 at this gap. The elastic heat-conducting sheet 5 is an elastic metal sheet. When the junction box 1 is inserted into the frame 4, the lower end of the elastic heat-conducting sheet 5 abuts against the top of the junction box 1. With this design, the heat inside the junction box 1 is concentrated at the top. The elastic heat-conducting sheet 5 utilizes the good thermal conductivity of metal to quickly diffuse the heat from the top of the junction box 1 outward, achieving a rapid heat dissipation effect.

[0028] Furthermore, the elastic heat-conducting sheets 5 have heat dissipation gaps 6 between them, and the airflow can further accelerate the heat dissipation effect of the elastic heat-conducting sheets 5, thereby further improving the heat dissipation effect of the junction box 1.

[0029] Reference Figures 4-6 The structure of combiner box 1 is as follows.

[0030] The junction box 1 includes a box body 11 and a cover 12 that are sealed to each other. The cover 12 is pressed onto the edge of the box body 11 by a rubber strip, and then the two are locked together by screws to achieve a seal between the box body 11 and the cover 12. A sealing ring is also provided at the wire hole position of box 11. This is a standard design for wire holes and will not be elaborated on further in this case.

[0031] The box 11 contains components such as circuit breakers and fuses 3; An inner heat-conducting sheet 2 is welded to the inner surface of the cover 12. The inner heat-conducting sheet 2 consists of a longitudinal heat-conducting sheet 21 and a transverse heat-conducting sheet 22. The longitudinal heat-conducting sheet 21 and the transverse heat-conducting sheet 22 are cross-fixed to the cover 12 and can reinforce the cover 12.

[0032] When the cover 12 is closed on the box 11, the inner heat-conducting plate 2 and the components 3 maintain sufficient vertical spacing.

[0033] The working principle is: After a large amount of Joule heat is generated inside the box 11, the heat is transferred upwards. The heat can be quickly transferred to the cover 12 through the inner heat-conducting plate 2 arranged on the cover 12. In addition, the heat is quickly diffused outwards by the elastic heat-conducting plate 5 on the outside of the cover 12. The metal heat conduction system of the inner heat-conducting plate 2, the metal cover 12 and the metal elastic heat-conducting plate 5 realizes the path for the heat in the sealed box 11 to be quickly diffused outwards. This relies on the excellent thermal conductivity of the metal. Secondly, the design of the built-in internal heat-conducting plate 2 and the externally contacting elastic heat-conducting plate 5 can maintain the flatness of the outer surface of the box 11, making it easier for workers to move and install the junction box 1. This avoids the existing design of directly using heat dissipation fins on the outer wall of the box 11. The elastic heat-conducting sheet 5 is pressed against the upper part of the junction box 1, and it works with the frame 4 to clamp and fix the junction box 1, making the junction box 1 easy to install. In other embodiments, the user can further fix the junction box 1 and the frame 4 with screws.

[0034] Example 2: An energy storage device with a combiner box, the difference from Example 1 is as follows (see Example 1). Figure 7 and Figure 8 The elastic heat-conducting sheet 5 includes a heat dissipation surface 52 that adheres to the cover 12. The lower edge of the elastic heat-conducting sheet 5 is a flat plate, and the upper surface of the plate is the heat dissipation surface 52. The plate and the cover 12 are attached to each other to increase the contact area between them and improve the heat dissipation effect.

[0035] The end of the elastic heat-conducting sheet 5 is provided with an upward-curved piece 51, which is positioned towards the insertion position of the junction box 1. When the junction box 1 is inserted into the frame 4, the upward-curved piece 51 facilitates the insertion of the junction box 1.

[0036] Example 3: An energy storage device with a combiner box, which differs from Example 1, as described below. Figures 9-11 The side of the box 11 has air holes 8, and there can be multiple air holes 8.

[0037] The edge of the pore 8 is fixed with a Ni-Ti based shape memory alloy cover 9 by laser welding. The cover is preset with a temperature threshold of 40-80℃, and the temperature threshold can be adjusted according to the energy storage scenario.

[0038] In this embodiment, the temperature threshold is 50°C; The memory cover 9 has an integrally vulcanized annular sealing rubber strip 91 along its edge. When the cover is in the sealed state, the rubber strip fits tightly against the side of the box body 11 to ensure sealing performance. Its lower end is rigidly fixed to the lower edge of the vent 8 by laser welding. When the temperature inside the box is greater than or equal to the threshold, the cover plate bends 30-45° towards the inside of the box body 11 along the fixed end, fully opening the vent 8 and forming a flow channel to accelerate heat convection. When the temperature is below the threshold, the cover plate accurately resets due to the shape memory effect and re-seals the vent 8.

[0039] The memory cover 9 can still stably reset after 1000 cycles of hot and cold, with no degradation in sealing performance, balancing heat preservation and timely heat dissipation.

[0040] Working principle: The heat dissipation of the memory cover 9 is used for rapid heat dissipation when the temperature inside the box 11 is too high.

[0041] The combination of the inner heat-conducting sheet 2 and the elastic heat-conducting sheet 5 can meet the heat dissipation requirements for the normal operation of the junction box 1; however, when the outdoor temperature is high, the ambient temperature rises and the overall temperature inside the junction box 1 also rises. At this time, in order to avoid long-term high temperature inside the box 11, the memory cover 9 is designed to open for ventilation to achieve rapid heat dissipation.

[0042] Therefore, ventilation and heat dissipation of the memory cover 9 is not a normal requirement, but a requirement for rapid cooling when the temperature inside the internal heat-conducting plate 1 inside the junction box rises abnormally. At this time, the junction box 1 is ventilated for a short period of time to meet the heat dissipation requirement. After the temperature drops, the memory cover 9 remains closed.

[0043] And through Figure 11 As can be seen, after the hot air rises in the manifold 1, it first flows laterally and diffuses outward. The memory cover 9 bends into the box 11 to form a guide channel. When the hot air is discharged outward along the guide channel, it forms a positive airflow barrier. External impurities are difficult to invade the interior of the manifold 1 due to the airflow resistance and the obstruction of the guide structure, thus ensuring the sealing effect.

[0044] Example 4: An energy storage device with a combiner box, which differs from Example 1, 2, or 3, as described below. Figure 12 Combiner box 1 connects to two battery clusters 10.

[0045] The principle of energy storage devices supplying power to the outside world: The two sets of energy storage battery clusters 10 output DC power, which enters the combiner box 1 through their respective branches ("dual input"). Inside combiner box 1, two DC power lines are combined into one ("one output") via copper busbars / terminals. Simultaneously: The anti-reverse diode prevents "reverse current" from occurring between the two battery clusters 10, thus preventing one battery group from charging the other. As a branch circuit protection, if an overcurrent fault occurs in a certain battery cluster 10, the corresponding fuse will blow to prevent the fault from spreading.

[0046] The combined DC power is then output to the energy storage converter after passing through the main switch and surge protector, where it is converted into AC power and fed into the power grid or supplied to the load.

[0047] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. An energy storage device with a combiner box (1), the combiner box (1) comprising a housing (11) and a cover (12) that are sealed together, characterized in that, it also... include: An inner heat-conducting sheet (2) is provided on the inner surface of the cover (12). The inner heat-conducting sheet (2) is located above the components (3) inside the box (11) and maintains a distance from the components (3). The frame (4) for inserting the junction box (1) supports the bottom of the box body (11); The elastic heat-conducting sheet (5) is fixed to the frame (4). The elastic heat-conducting sheet (5) abuts against the outer surface of the cover (12) to clamp and fix the cover (12) and the box (11) from the top and bottom. The elastic heat-conducting sheet (5) accelerates the heat dissipation of the cover (12) to the outside.

2. The energy storage device with a combiner box according to claim 1, characterized in that: There are heat dissipation gaps (6) between the elastic heat-conducting sheets (5).

3. The energy storage device with a combiner box according to claim 1, characterized in that: The frame (4) is equipped with a heat dissipation fan (7), and the elastic heat-conducting sheet (5) is located on the airflow channel of the heat dissipation fan (7).

4. The energy storage device with a combiner box according to claim 1, characterized in that: The inner heat-conducting sheet (2) consists of a longitudinal heat-conducting sheet (21) and a transverse heat-conducting sheet (22). The longitudinal heat-conducting sheet (21) and the transverse heat-conducting sheet (22) are cross-fixed to the cover (12) to reinforce the cover (12).

5. The energy storage device with a combiner box according to claim 1, characterized in that: The end of the elastic heat-conducting sheet (5) is provided with an upward-curving arc-shaped piece (51), which is set towards the insertion direction of the junction box (1) to facilitate the insertion of the junction box (1) into the frame (4).

6. The energy storage device with a combiner box according to claim 1, characterized in that: The box body (11) is provided with air holes (8), and a memory cover (9) is fixed to the edge of the air holes (8); When the temperature is greater than or equal to the temperature threshold of the memory cover (9), the memory cover (9) bends to open the vent (8); When the temperature is lower than the temperature threshold of the memory cover (9), the memory cover (9) resets and seals the vent (8).

7. The energy storage device with a combiner box according to claim 6, characterized in that: A sealing rubber strip (91) is fixed to the edge of the memory cover (9); When the memory cover (9) seals the air hole (8), the sealing rubber strip (91) adheres to the box body (11).

8. The energy storage device with a combiner box according to claim 6 or 7, characterized in that: The air hole (8) is located on the side of the box body (11), and the lower end of the memory cover (9) and the lower edge of the air hole (8) are fixed. When the memory cover (9) is opened, the memory cover (9) bends into the box (11) to form a heat conduction state.

9. The energy storage device with a combiner box according to claim 1, characterized in that: The elastic heat-conducting sheet (5) includes a heat dissipation surface (52) that fits the cover (12).

10. The energy storage device with a combiner box according to claim 1, characterized in that: The junction box (1) connects two battery clusters (10).

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