An immersion liquid-cooled battery box

Abstract

The utility model relates to battery cooling technical field, proposes a kind of immersion liquid cooling battery box, including inner box, inner cover, connecting piece, explosion-proof valve and box outer cover;The inner cover is sealed and connected between inner box by inner cover gasket, and the sealed space for accommodating coolant and battery module is formed;The connecting piece includes power connecting piece and communication connecting piece, and the power connecting piece and communication connecting piece are all set in the side of inner cover away from sealed space;The explosion-proof valve is fixed on inner cover, and is communicated with the sealed space of inner box;Power and communication connecting piece in the utility model are all located outside coolant, avoid the corrosion or interference of coolant to connecting portion, reduce the risk of poor contact and temperature rise too high, and the setting of explosion-proof valve improves the security of battery box, adapts to the pressure change under different working conditions, can realize coolant completely sealed, effectively prevent leakage.

Description

Technical Field

[0001] This utility model relates to the field of battery cooling technology, specifically to an immersion liquid-cooled battery box. Background Technology

[0002] Currently, battery energy storage systems generally employ two cooling methods: first, air cooling to control ambient temperature, which suffers from low heat dissipation efficiency and a relatively slow rate of temperature change due to air-based temperature regulation; second, liquid cooling using circulating coolant, requiring the installation of liquid cooling pipes, occupying significant space, and resulting in a complex and costly system. Furthermore, air and water cooling do not offer ideal temperature uniformity. Therefore, a cooling method has emerged that directly immerses battery modules in a battery box filled with coolant. This method rapidly cools the surface of the battery modules by replacing the coolant within the battery box, offering higher cooling efficiency and flame-retardant properties.

[0003] A search revealed that patent CN222953172U discloses an immersion liquid-cooled battery box, comprising a box body with a built-in lithium battery module. The box body is sealed and divided into a large compartment and a small compartment. The large compartment houses the lithium battery module submerged in cooling liquid, and a liquid injection system is connected to the outside of the large compartment. The small compartment houses the lithium battery module and integrates the necessary connectors. A sight glass is provided on the outside of the box body, with its upper and lower ends connected to the large compartment via pipes. The advantages of this immersion liquid-cooled battery box are: it significantly improves the heat exchange capacity of the energy storage box; the sealed and isolated box structure facilitates operation and maintenance; it allows for real-time filling of cooling liquid; and it provides liquid level observation.

[0004] However, the above-mentioned immersion liquid-cooled battery box still has the following problems: First, the existing technology does not clearly define the sealing connection method between the power and communication output of the inner box and the external structure. No explosion-proof valve is installed in the sealed space of the box, which poses certain safety hazards. In addition, the two compartments share a sealing cover, which poses a risk of poor sealing and may lead to problems such as coolant leakage or poor contact of connecting parts. Utility Model Content

[0005] This invention aims to solve the problems of poor coolant sealing and poor contact of connectors caused by coolant in the prior art, and to achieve complete sealing of the submerged coolant by arranging all connectors on the outside of the coolant, thereby improving the safety and stability of the battery box.

[0006] The technical solution of this utility model is as follows: an immersion liquid-cooled battery box, including an inner box, an inner cover, a connector, an explosion-proof valve, and an outer cover; The inner cover and the inner box are sealed together by an inner cover sealing gasket, forming a sealed space for accommodating coolant and battery module. The connector includes a power connector and a communication connector, both of which are located on the side of the inner cover away from the sealed space. The explosion-proof valve is fixed to the inner cover and communicates with the sealed space of the inner box.

[0007] Preferably, the power connector includes a copper busbar, one end of which is connected to the positive and negative terminals of the battery module, and the other end extends through the inner cover to the outside of the sealed space; a sealing structure is provided at the penetration position between the copper busbar and the inner cover, and the sealing structure includes a plastic bracket, a copper busbar sealing gasket, a bracket sealing gasket, and sealant.

[0008] Preferably, the plastic bracket is fitted onto the outside of the copper busbar and is fixedly connected to the inner cover by a nut; the bracket sealing gasket is sandwiched between the plastic bracket and the inner cover, the copper busbar sealing gasket is fitted onto the outside of the copper busbar and placed on the plastic bracket, and the sealant fills the gap between the plastic bracket and the copper busbar and the connecting edge between the plastic bracket and the inner cover.

[0009] Preferably, the communication connector includes a PCB adapter board, which is fixed to the inner cover by a nut and connected to the communication terminal of the battery module by a wire. A PCB sealing gasket is sandwiched between the PCB adapter board and the inner cover.

[0010] Preferably, the connection edge between the PCB adapter board and the inner cover is filled with sealant.

[0011] Preferably, the inner cover is provided with two oil seals, which are used for sealing tests before coolant injection.

[0012] The beneficial effects of this utility model are as follows: In this invention, both the power and communication connectors are located outside the coolant, preventing the coolant from corroding or interfering with the connection, reducing the risk of poor contact and excessive temperature rise. The explosion-proof valve enhances the safety of the battery box, adapts to pressure changes under different operating conditions, and enables complete sealing of the coolant, effectively preventing leakage. Attached Figure Description

[0013] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0014] Figure 1 This is a schematic diagram of the overall structure of an immersion liquid-cooled battery box proposed in this utility model; Figure 2 This is a schematic diagram of the disassembled structure of the outer cover and inner box of the box proposed in this utility model; Figure 3 This is a schematic diagram of the overall structure of the power connection component proposed in this utility model; Figure 4This is a schematic diagram of the disassembled structure of the communication connector proposed in this utility model; Figure 5 This is a schematic diagram of an explosion of an immersion liquid-cooled battery box proposed in this utility model; In the diagram: 1. Inner casing; 2. Inner cover; 3. Explosion-proof valve; 4. Outer cover of the casing; 5. Inner cover sealing gasket; 6. Power connector; 61. Copper busbar; 62. Plastic bracket; 63. Copper busbar sealing gasket; 64. Bracket sealing gasket; 7. Communication connector; 71. PCB adapter board; 72. PCB sealing gasket; 8. Oil seal. Detailed Implementation

[0015] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this utility model.

[0016] Please see Figures 1-5 This utility model provides a technical solution: an immersion liquid-cooled battery box, including an inner box 1, an inner cover 2, connectors, an explosion-proof valve 3, and an outer cover 4. The inner cover 2 and the inner box 1 are sealed together by an inner cover sealing gasket 5 to form a sealed space for accommodating coolant and battery modules. The connectors include a power connector 6 and a communication connector 7, both of which are located on the side of the inner cover 2 away from the sealed space. The explosion-proof valve 3 is fixed to the inner cover 2 and communicates with the sealed space of the inner box 1. When the air pressure in the sealed space is too high, the explosion-proof valve 3 can automatically release pressure to avoid damage to the box.

[0017] Please see Figure 2 and Figure 3 The power connector 6 includes a copper busbar 61. One end of the copper busbar 61 is connected to the positive and negative terminals of the battery module, and the other end extends through the inner cover 2 to the outside of the sealed space. A sealing structure is provided at the penetration position between the copper busbar 61 and the inner cover 2. The sealing structure includes a plastic bracket 62, a copper busbar sealing gasket 63, a bracket sealing gasket 64, and sealant. The positive and negative terminals of the battery module are led out of the inner casing 1 through the copper busbar 61. The position where the copper busbar 61 penetrates the inner cover 2 is sealed multiple times with a plastic bracket 62, a bracket sealing gasket 64, and sealant to ensure that the coolant does not leak.

[0018] Furthermore, the plastic bracket 62 is fitted onto the outside of the copper busbar 61 and is fixedly connected to the inner cover 2 by a nut; the bracket sealing gasket 64 is sandwiched between the plastic bracket 62 and the inner cover 2; the copper busbar sealing gasket 63 is fitted onto the outside of the copper busbar 61 and placed on the plastic bracket 62; and the sealant fills the gap between the plastic bracket 62 and the copper busbar 61 and the connecting edge between the plastic bracket 62 and the inner cover 2.

[0019] Please see Figure 4 and Figure 5 The communication connector 7 includes a PCB adapter board 71, which is fixed to the inner cover 2 by a nut and connected to the communication terminal of the battery module by a wire. A PCB sealing gasket 72 is sandwiched between the PCB adapter board 71 and the inner cover 2. The connection edge between the PCB adapter board 71 and the inner cover 2 is filled with sealant. The communication port is connected internally and externally through the PCB adapter board 71. The PCB adapter board 71 is fixed to the outside of the inner cover 2, and a PCB sealing gasket 72 is provided between it and the inner cover 2. The connection edge is sealed with glue.

[0020] Furthermore, the inner cover 2 is provided with two oil seals 8. The oil seals 8 are used to perform a sealing test before the coolant is injected, and the coolant is injected after the test is passed.

[0021] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. An immersion-type liquid-cooled battery box, characterized in that, Includes inner box (1), inner cover (2), connectors, explosion-proof valve (3) and outer cover (4); The inner cover (2) and the inner box (1) are sealed together by the inner cover sealing gasket (5) to form a sealed space for accommodating coolant and battery module; The connectors include a power connector (6) and a communication connector (7), both of which are located on the side of the inner cover (2) away from the sealed space. The explosion-proof valve (3) is fixed on the inner cover (2) and is connected to the sealed space of the inner box (1).

2. The immersion liquid-cooled battery box according to claim 1, characterized in that, The power connector (6) includes a copper busbar (61), one end of which is connected to the positive and negative terminals of the battery module, and the other end extends through the inner cover (2) to the outside of the sealed space. A sealing structure is provided at the penetration position between the copper busbar (61) and the inner cover (2). The sealing structure includes a plastic bracket (62), a copper busbar sealing gasket (63), a bracket sealing gasket (64), and sealant.

3. The immersion liquid-cooled battery box according to claim 2, characterized in that, The plastic bracket (62) is fitted on the outside of the copper busbar (61) and fixedly connected to the inner cover (2) by a nut; the bracket sealing gasket (64) is sandwiched between the plastic bracket (62) and the inner cover (2); the copper busbar sealing gasket (63) is fitted on the outside of the copper busbar (61) and placed on the plastic bracket (62); the sealant is filled in the gap between the plastic bracket (62) and the copper busbar (61) and the connecting edge between the plastic bracket (62) and the inner cover (2).

4. The immersion liquid-cooled battery box according to claim 1, characterized in that, The communication connector (7) includes a PCB adapter board (71), which is fixed to the inner cover (2) by a nut and connected to the communication terminal of the battery module by a wire. A PCB sealing gasket (72) is sandwiched between the PCB adapter board (71) and the inner cover (2).

5. The immersion liquid-cooled battery box according to claim 4, characterized in that, The connection edge between the PCB adapter board (71) and the inner cover (2) is filled with sealant.

6. The immersion liquid-cooled battery box according to claim 1, characterized in that, The inner cover (2) is provided with two oil seals (8), which are used for sealing tests before coolant is injected.

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