A passive heat dissipation battery box

Abstract

The present application discloses a non-passive heat dissipation battery box, comprising a box body, the box body comprising a base and an inner box body and an outer box body arranged on the base, a phase change material being arranged between the inner box body and the outer box body, a battery pack being arranged in the inner box body, the battery pack comprising two parallel rows of battery cells, the electrodes of the two rows of battery cells being arranged opposite to each other; a baffle being arranged between the two rows of battery cells, and an explosion relief channel being arranged between the battery cells and the baffle. The present application utilizes a cylindrical structure of a solid phase change material such as paraffin wax and a material such as aluminum alloy that is conducive to heat dissipation, and can absorb and release the heat generated by the battery cells in the battery box during charging and discharging without providing additional cooling equipment, so that the temperature of the battery cell body is controlled within a certain range, which is beneficial to the series design of the battery cells, the heat dissipation of the battery, the release and collection of explosion relief gas, the modular design and application of the battery box, and the modular design of the energy storage system.

Description

Technical Field

[0001] The present application relates to the field of batteries, and in particular to an energy storage battery box. Background Art

[0002] Currently, energy storage batteries are typically used in power supply systems in centralized cabinets, which typically contain battery cells, inverters, and control units. Due to the high power consumption of energy storage cabinets, all battery cells are centrally located, making fires prone to complex problems such as secondary combustion and explosion. Furthermore, to dissipate heat from the batteries and control components within the cabinets, the cabinet's heat dissipation system must be kept on 24 / 7, consuming significant energy. Against the backdrop of carbon peak and carbon neutrality, the energy storage industry is expected to experience significant growth, and ensuring that energy storage batteries are safe, energy-efficient, and efficient is imperative.

[0003] Phase change materials, as cooling media, offer high energy storage density, easy process control, and high energy efficiency. They also consume no external energy when absorbing and releasing heat, making them ideal for battery thermal management applications. Replacing large energy storage battery cabinets with small, discrete outdoor battery boxes allows for independent cooling, fire protection, and energy management functions, providing significant value for on-site safety and routine maintenance.

[0004] Patent application CN206340590U discloses a lithium-ion battery case with a thermal blocking function. The case comprises an inner case and an outer case, a heat-absorbing layer disposed between the inner and outer cases, a pressure relief valve disposed on the outer case shell, and a heat-absorbing material addition port disposed on the outer case shell. When thermal runaway occurs in the battery within the case, the heat released by the battery is absorbed by the internal filling material, thereby improving the safety performance of the lithium-ion battery module and system. This patent only utilizes phase change materials as a means of cooling the battery during thermal runaway, but fails to address how to release the heat absorbed by the phase change materials, nor does it address how to handle the gas ejected during battery explosion.

[0005] Patent applications CN205810969U and CN208723043U propose solutions where the battery is directly in contact with a phase-change material, utilizing the latent heat of the phase-change material to absorb the battery's heat. This solution only provides a simple partial fixation of the battery, making it unusable for batteries requiring a certain degree of compression during installation. Furthermore, the solution fails to address the gasses emitted during battery explosions.

[0006] Therefore, this application proposes a discrete passive heat dissipation battery box that differs from the traditional method of using phase change materials to cool batteries. Its heat dissipation, fire protection, and energy management functions all operate independently. It can absorb heat from the batteries while they are operating and release heat through natural heat dissipation. During battery installation, it can apply a certain clamping force to the entire battery to prevent swelling. In the event of thermal runaway, the exhaust gas is collected through the explosion venting channel, thus achieving the battery box's battery safety, energy saving, and high efficiency requirements. Summary of the Invention

[0007] In order to solve the above problems, the present application proposes a passive heat dissipation battery box, which solves the shortcomings of existing equipment.

[0008] In order to solve the above problems, this application proposes the following technical solutions:

[0009] An embodiment of the present application provides a passive heat dissipation battery box, comprising a box body, the box body comprising a base, an inner box body and an outer box body disposed on the base, a phase change material disposed between the inner and outer boxes, and the inner box body being provided with a battery pack. The battery pack comprises two parallel rows of battery cells, the electrodes of the two rows of battery cells being disposed opposite each other; a baffle is disposed between the two rows of battery cells, and an explosion relief channel is disposed between the battery cells and the baffle. The battery cells comprise a plurality of single cells. A compressible thermally conductive gasket is disposed between the battery pack and the inner wall of the inner box body.

[0010] Furthermore, the inner box is provided with a plurality of partitions for placing single cells.

[0011] Furthermore, the inner box includes a clamping plate and an end plate;

[0012] The clamping plate is connected to the partition plate through bolts.

[0013] Furthermore, rollers for moving the box are provided under the base.

[0014] Furthermore, it includes a connection control unit arranged above or below the box body; the connection control unit includes a connection busbar for connecting the power and signal cables of the battery box to the outside, an external plug, a BMS, and an inverter module. Furthermore, it includes a gas collection unit arranged above or below the connection control unit;

[0015] The gas collection unit comprises an adsorption layer and a collection layer for collecting gas ejected when the battery explodes.

[0016] Beneficial effects of this application:

[0017] This application discloses a passive heat dissipation battery box. This battery box utilizes a box structure made of solid phase change materials such as paraffin wax and heat-dissipating materials such as aluminum alloy. Without the need for additional cooling equipment, it can absorb and release the heat generated by the battery cells in the battery box during charging and discharging, thereby controlling the temperature of the battery cells within a certain range. This application facilitates the design of series-connected battery cells, the heat dissipation of batteries, the release and collection of explosion-proof gases, the modular design and application of battery boxes, and the modular design of energy storage systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] For ease of explanation, this application is described in detail with the following specific implementations and drawings.

[0019] Figure 1 This is a schematic diagram of the overall structure of the battery box of this application.

[0020] Figure 2 This is a schematic diagram of the decomposed structure of the battery box of this application.

[0021] Figure 3 This is a schematic diagram of the side panel structure of the battery box outer body of this application.

[0022] Figure 4 This is a schematic cross-sectional view of the battery box of this application.

[0023] Figure 5 This is a schematic diagram of the battery pack and its fixing structure of this application.

[0024] Explanation of the reference numerals: 1- housing; 2- connection control unit; 3- gas collection unit; 11- side panel; 112- mounting strip; 113- sealing strip; 12- panel; 13- splint; 14- end plate; 15- base; 16- caster; 17- baffle; 18- channel; 19- partition; 4- battery pack; 5- thermal pad; 6- paraffin. DETAILED DESCRIPTION

[0025] The technical solution of this application is described in detail below with reference to the accompanying drawings.

[0026] like Figures 1 to 3 As shown, the battery box body 1 is composed of a connection control unit 2, a gas collection unit 3 and the like. The connection control unit 2 can be located above the battery box body 1 or below the battery box body 1.

[0027] Specifically, the box body includes an outer box body, an inner box body, and a base.

[0028] The outer box body is composed of panels 12 arranged at the front and rear and side panels 11 arranged on both sides. Each panel is fixedly connected to the base 15 by mounting strips 112 and bolts. A sealing strip 113 is installed between each panel and the mounting strip to play a sealing role and prevent the paraffin filled inside from leaking out.

[0029] The inner box body is also composed of front and rear end plates 14 and battery clamps 13 arranged on both sides. The end plates 14 and the battery clamps 13 are fastened together by screws. A sealing strip is installed between the end plates and the battery clamps to prevent paraffin from penetrating into the inner box body.

[0030] The inner box and the outer box are fixed to the same base 15 by bolts. The tops of the inner box and the outer box are connected together by a top plate or an upper frame assembly. The two layers of cylinders can be connected together by rigid connectors to play a role of fixation and reinforcement.

[0031] Similarly, sealing strips are installed between the inner box body, the outer box body and the base to achieve sealing.

[0032] In order to improve the heat dissipation efficiency of the battery box, the box material of the inner box and the outer box is aluminum alloy material, which facilitates the heat dissipation of the battery box.

[0033] Furthermore, the inner box and the outer box can be made of sheet metal splicing or aluminum extrusion profiles with heat dissipation teeth.

[0034] Furthermore, the inner cylinder and the outer cylinder may be treated with anodizing or the like to enhance the radiation heat exchange capacity of the battery box.

[0035] In order to facilitate the movement of the battery box, movable casters 16 are provided on the base.

[0036] Furthermore, the battery box is equipped with a variety of connecting and fixing parts, and the base is provided with mounting holes. Different connecting and fixing parts can be used to fix the battery box to the ground and other fixed objects, and different battery boxes can be connected at the same time.

[0037] like Figure 4As shown, a battery pack 4 is placed inside the inner box, and a compressible thermally conductive gasket 5 is provided between the battery pack and the inner wall of the inner box to fill the assembly gap caused by the uneven surface of the battery and improve the thermal conductivity. The phase change material paraffin 6 is filled between the inner box and the outer box. Since the density of paraffin 6 in solid and liquid states is different, a certain amount of space must be left when refilling to ensure that the paraffin has room to expand. The heat generated by the battery during charging and discharging is transferred to the paraffin 6 through the thermally conductive gasket 5 and the inner box. Since the latent heat of paraffin 6 at the phase change temperature point is very large, it can absorb a large amount of heat while the temperature of the paraffin itself is maintained at the phase change temperature point. This point is used to control the temperature of the battery pack 4 itself to around the phase change temperature point of paraffin 6. At the same time, the radiant heat from the outside world transmitted to the paraffin 6 through the outer box is also absorbed by the latent heat of the paraffin. When the temperature is lower in the morning and evening, the principle of natural heat dissipation is used to dissipate the heat generated by the battery absorbed by the paraffin and the external radiation heat through the surface of the outer box panel 12 and the outer box side panel assembly 11, so as to ensure that the heat dissipation system of the entire battery box is in a stable circulation state.

[0038] like Figure 5 As shown, the battery pack includes two rows of battery cells arranged in parallel, the electrodes of the two rows of battery cells are arranged opposite to each other, and the batteries are connected by connecting bars. The channel 18 between the two rows of batteries is both a wiring space and a gas explosion venting channel.

[0039] A baffle 17 is installed between the two rows of batteries to prevent the venting gas from affecting the batteries on the opposite side. Inside the inner box, corresponding partitions 19 are installed according to the number of batteries. The batteries are placed on the partitions 19, which are connected to the battery clamps 13 by bolts. When the bolts connecting the outer side of the battery clamps 13 to the partitions 19 are tightened, the battery pack 4 is tightly clamped between the two battery clamps 13, ensuring the battery installation requirements are compressed.

[0040] The battery box also includes a gas collection unit and a connection control unit located above or below the battery cylinder. The gas collection unit includes an adsorption layer and a collection layer to collect gas emitted when the battery explodes. The connection control unit internally includes a busbar, external plug, BMS, inverter module, and other components for connecting the battery box's external power and signal cables.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and not to limit them. Although the present application has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present application can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present application should be included in the scope of protection of the claims of the present application.

[0042] It is understood from common technical knowledge that the present application may be implemented by other embodiments that do not deviate from its spirit or essential features. Therefore, the embodiments disclosed above are merely illustrative in all respects and are not intended to be exclusive. All modifications that come within the scope of this application or are equivalent to the scope of this application are intended to be included in this application.

Claims

1. A passive heat dissipation battery box, comprising a box body, the box body comprising a base and an inner box body and an outer box body arranged on the base, characterized in that: The inner box is provided with a battery pack, which includes two parallel rows of battery cells, with electrodes of the two rows of battery cells facing each other; the batteries are connected by a connecting bar; A baffle is provided between the two rows of battery cells, and an explosion relief channel is provided between the battery cells and the baffle; Phase change material is provided between the inner box and the outer box; The battery unit includes a plurality of single cells; A compressible thermally conductive gasket is provided between the battery pack and the inner wall of the inner box; The inner box body is provided with a plurality of partitions for placing single cells. The inner box body includes a clamping plate and an end plate; the clamping plate and the partitions are connected by bolts.

2. A passive heat dissipation battery box according to claim 1, characterized in that: Rollers for moving the box body are provided under the base.

3. The passive heat dissipation battery box according to claim 1, characterized in that: It includes a connection control unit arranged above or below the box; The connection control unit includes a connection busbar for connecting the battery box to external power and signal cables, an external plug, a BMS, and an inverter module.

4. A passive heat dissipation battery box according to claim 3, characterized in that: comprising a gas collecting unit disposed above or below the connection control unit; The gas collection unit comprises an adsorption layer and a collection layer for collecting gas ejected when the battery explodes.

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