A battery pack structure

Abstract

The application discloses a battery Pack structure, comprising: a box assembly composed of a cover plate and a liquid cooling plate, a heat preservation layer is arranged on the inner side of the cover plate, a battery cell module is arranged on the liquid cooling plate, the battery cell module comprises a battery cell group and a CCS assembly which is electrically connected with the battery cell group and covers the top of the battery cell group, an aerosol fire extinguisher is fixed on the cross beam of the liquid cooling plate, and an electrical assembly is detachably installed on the cover plate, wherein the electrical assembly comprises a panel and a functional module which is electrically connected with the CCS assembly and is arranged on the panel; the surface cooling is delayed through the heat preservation layer on the inner side of the cover plate, the condensation phenomenon of the inner wall of the box is eliminated, and the circuit short circuit is avoided; the aerosol fire extinguisher is fixed on the liquid cooling plate, and millisecond fire suppression is realized; the detachable integrated design of the electrical assembly can realize centralized maintenance, and the operation and maintenance efficiency is obviously improved.

Description

Technical Field

[0001] This utility model belongs to the field of battery liquid cooling pack technology, and particularly relates to a battery pack structure. Background Technology

[0002] In the field of battery liquid cooling pack technology, existing liquid cooling heat dissipation structures regulate cell temperature through cooling plates. However, when operating in high humidity environments, the temperature difference between the inside and outside of the pack causes the surface temperature of the casing to easily fall below the dew point temperature, resulting in water vapor in the air condensing into water droplets on the inner wall of the pack, which can cause short circuit faults. At the same time, the electrical components of traditional packs are scattered, requiring disassembly of the entire structure for maintenance, which is inconvenient. Furthermore, there is a lack of a rapid response mechanism for thermal runaway of the cells, which poses technical defects such as fire hazards and low maintenance efficiency. Utility Model Content

[0003] (I) Purpose of the utility model

[0004] To overcome the above shortcomings, the purpose of this utility model is to provide a battery pack structure that solves the technical problems of existing liquid-cooled battery packs, such as water droplets condensing on the inner wall of the box, causing short circuit faults, dispersed electrical components requiring disassembly of the entire structure for maintenance, inconvenient maintenance, lack of a rapid response mechanism for thermal runaway of battery cells, fire hazards, and low maintenance efficiency.

[0005] (II) Technical Solution

[0006] To achieve the above objectives, the technical solution provided in this application is as follows:

[0007] A battery pack structure includes: a box assembly formed by assembling a cover plate and a liquid cooling plate, the cover plate having an insulation layer on its inner side; a battery cell module placed on the liquid cooling plate, including a battery cell assembly and a CCS assembly electrically connected to the battery cell assembly covering the battery cell assembly; an aerosol fire extinguisher fixed on a crossbeam of the liquid cooling plate; and an electrical assembly detachably installed on the cover plate, wherein the electrical assembly includes: a panel and multiple functional modules disposed on the panel and electrically connected to the CCS assembly;

[0008] The inner insulation layer of the cover plate slows down surface cooling, eliminates condensation on the inner wall of the box, and avoids short circuits; the aerosol fire extinguisher is fixed to the liquid cooling plate to achieve millisecond-level fire suppression; the electrical components are designed to be detachable and integrated, allowing for centralized maintenance and significantly improving operation and maintenance efficiency.

[0009] In some embodiments, the multiple functional modules include: positive and negative output power terminals, BMU, communication terminals, and explosion-proof valve;

[0010] The functional modules are highly integrated, enabling "plug-and-play" maintenance.

[0011] In some embodiments, the CCS component includes: a series busbar electrically connected to a plurality of cell terminals of the cell assembly, an output busbar electrically connected to the series busbar, and further includes: a positive output busbar disposed on a liquid cooling plate and electrically connected to the output busbar and a positive output power terminal, and a negative output busbar disposed on a liquid cooling plate and electrically connected to the output busbar and a negative output power terminal, respectively.

[0012] In some embodiments, the electrical components include: a BMU unit, communication terminals, an explosion-proof valve, and positive and negative output power terminals.

[0013] In some embodiments, it further includes: an insulating sheet covering the surface of the CCS component;

[0014] The insulating sheet forms a secondary protective layer, which can still block leakage current even in condensation environments, enhance the safety of the system in humid scenarios, and make up for the limitations of a single enclosure seal.

[0015] In some embodiments, the insulation layer is a thermal insulation structure composed of a polyurethane coating or an aerogel coating.

[0016] Polyurethane or aerogel insulation layers block heat conduction with ultra-low thermal conductivity (<0.03W / m·K), completely eliminating the risk of condensation, and the flexible coating process of the material is compatible with complex box structures.

[0017] In some embodiments, the cover plate has an installation port for installing electrical components, and further includes a panel waterproof ring that surrounds the outside of the installation port and abuts against the electrical components.

[0018] The panel waterproof ring solves the sealing weakness of the removable module.

[0019] In some embodiments, it further includes: a waterproof ring for the housing that is disposed around the liquid cooling plate and abuts against the cover plate;

[0020] The enclosure's waterproof ring compensates for assembly tolerances, achieving IP67 protection and ensuring that the internal circuitry remains absolutely dry in high-humidity environments.

[0021] In some embodiments, it further includes: a lifting component that penetrates the cover plate and is fixedly connected to the liquid cooling plate;

[0022] The lifting components are directly connected to the liquid-cooled plate load-bearing frame, which disperses the vibration stress during transportation, protects the welding points of the battery cell terminals and busbars, and extends the service life; at the same time, it simplifies the lifting process and improves the assembly efficiency of the production line. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the battery pack structure of this utility model;

[0024] Figure 2This is a schematic diagram of the battery pack structure after disassembly and assembly of this utility model;

[0025] Figure 3 This is a schematic diagram of the CCS component in the battery pack structure of this utility model;

[0026] Figure 4 This is a schematic diagram of the electrical components in the battery pack structure of this utility model.

[0027] Figure label:

[0028] 1. Cover plate; 2. CCS assembly; 2-1. Series busbar; 2-2. Output busbar; 3. Insulating sheet; 4. Battery cell module; 5. Liquid cooling plate; 6. Housing waterproof ring; 7. Positive output busbar; 8. Electrical components; 8-1. BMU; 8-2. Communication terminal; 8-3. Explosion-proof valve; 8-4. Positive output power terminal; 8-5. Negative output power terminal; 8-6. Panel; 9. Negative output busbar; 10. Aerosol fire extinguisher; 11. Panel waterproof ring; 12. Lifting components. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this utility model. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of this utility model.

[0030] This utility model provides a battery pack structure, including: a housing assembly, which is assembled from a cover plate 1 and a liquid cooling plate 5. Specifically, the inner side of the cover plate 1 is coated with an insulation layer (e.g., a polyurethane coating), and a cell module is placed on the liquid cooling plate 5. The cell module includes a cell assembly 4 and a CCS component 2 covering it. The CCS component 2 is electrically connected to the terminals of the cell assembly 4 by laser welding. Further, an aerosol fire extinguisher 10 is fixed on the crossbeam of the liquid cooling plate 5, and the fire extinguisher is fastened to the crossbeam by bolts. Preferably, the cover plate 1 has a rectangular mounting opening, and the electrical component 8 is detachably installed in the mounting opening by a snap-fit. It is worth noting that the electrical component 8 includes: a panel 8-6 ​​and multiple functional modules (such as BMU8-1, power terminals, etc.) integrated into the panel 8-6. The functional modules are electrically connected to the CCS component 2 through plug-in terminals.

[0031] On the panel 8-6 ​​of the electrical component 8, a positive output power terminal 8-4, a negative output power terminal 8-5, a BMU unit 8-1, a communication terminal 8-2, and an explosion-proof valve 8-3 are centrally arranged. Preferably, the positive and negative output power terminals 8-5 are made of copper alloy with a nickel-plated surface to reduce contact resistance; the BMU unit 8-1 is connected to the CCS component 2 via a ribbon cable to monitor the cell voltage in real time. In particular, the explosion-proof valve 8-3 is embedded in the central area of ​​the panel 8-6, and its burst pressure threshold is 0.5 MPa, ensuring rapid pressure relief in the event of thermal runaway.

[0032] CCS component 2 includes a series bus 2-1 and an output bus 2-2. The series bus 2-1 connects multiple terminals of the battery cell assembly 4 via laser welding to form a series circuit; the output bus 2-2 is bolted to the series bus 2-1. Based on this, a positive output bus 7 and a negative output bus 9 are provided on the liquid cooling plate 5. One end of the positive output bus 7 is welded to the positive connection point of the output bus 2-2, and the other end is connected to the positive output power terminal 8-4 of the electrical component 8 via a copper nut; one end of the negative output bus 9 is welded to the negative connection point of the output bus 2-2, and the other end is connected to the negative output power terminal 8-5 of the electrical component 8. Preferably, the bus is made of 0.8mm thick copper strip with an insulating coating on the surface.

[0033] Preferably, this application also covers the surface of the CCS module 2 with an insulating sheet 3, which is made of PET material and has a thickness of approximately 0.2 mm. In particular, the edge of the insulating sheet 3 extends to the edge of the liquid cooling plate 5 and is fixed by high-temperature resistant tape to achieve double insulation isolation between the cell module and the metal casing.

[0034] The insulation layer on the inner side of the cover plate 1 is preferably a polyurethane coating (approximately 1 mm thick) or an aerogel coating (approximately 2 mm thick). It is worth noting that the polyurethane coating is formed by a spraying process, while the aerogel coating is cured by a scraping process. Alternatively, ceramic fiber composite materials can also be used, all with thermal conductivity below 0.03 W / m·K.

[0035] Specifically, the aerosol fire extinguisher 10 contains a solid extinguishing agent (such as strontium nitrate compound). When the battery cell thermal runaway causes the ambient temperature to be >150°C, the extinguishing agent decomposes under heat to produce high-density inert aerosol particles, which rapidly dilute oxygen and interrupt the combustion chain reaction, achieving millisecond-level fire suppression.

[0036] Preferably, a panel waterproof ring 11 is provided around the outer side of the mounting opening of the cover plate 1. This waterproof ring is made of silicone and has a hollow O-shaped cross-section. When the electrical components 8 are installed, the panel waterproof ring 11 deforms under pressure to achieve a seal. Furthermore, a housing waterproof ring 6, made of EPDM rubber, is slotted into the edge of the liquid cooling plate 5 and fits tightly against the edge of the cover plate 1 after assembly. In this way, the two waterproof rings form a two-level sealing barrier, which can withstand the IP67 protection level spray test.

[0037] Furthermore, this application includes a lifting component 12, which is a U-shaped stainless steel lifting ring. Its vertical section passes through a pre-reserved hole in the cover plate 1, and its horizontal section is fixed to the load-bearing beam of the liquid cooling plate 5 by bolts. Preferably, a rubber shock-absorbing pad is added at the connection between the lifting component 12 and the liquid cooling plate 5 to disperse the mechanical impact force during transportation.

[0038] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of this utility model and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of this utility model should be included within its protection scope. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. A battery pack structure, characterized in that, include: The box assembly is formed by assembling a cover plate (1) and a liquid cooling plate (5). The cover plate (1) has an insulation layer on its inner side. The battery cell module (4) placed on the liquid cooling plate (5) includes a battery cell group and a CCS component (2) that is electrically connected to the battery cell group and covers the battery cell group. An aerosol fire extinguisher (10) is fixed on the crossbeam of the liquid cooling plate (5). An electrical component (8) is detachably installed on the cover plate (1). The electrical component (8) includes a panel (8-6) and multiple functional modules that are electrically connected to the CCS component (2) and are arranged on the panel (8-6).

2. The battery pack structure according to claim 1, characterized in that, The functional modules include: positive output power terminal (8-4), negative output power terminal (8-5), BMU (8-1), communication terminal (8-2), and explosion-proof valve (8-3).

3. The battery pack structure according to claim 2, characterized in that, The CCS component (2) includes: a series busbar (2-1) electrically connected to a plurality of cell terminals of the cell module (4), an output busbar (2-2) electrically connected to the series busbar (2-1), and further includes: a positive output busbar (7) disposed on the liquid cooling plate (5) and electrically connected to the output busbar (2-2) and the positive output power terminal (8-4) respectively, and a negative output busbar (9) disposed on the liquid cooling plate (5) and electrically connected to the output busbar (2-2) and the negative output power terminal (8-5) respectively.

4. The battery pack structure according to claim 3, characterized in that, The multiple functional modules include: BMU unit (8-1), communication terminal (8-2), explosion-proof valve (8-3), positive output power terminal (8-4), and negative output power terminal (8-5).

5. The battery pack structure according to claim 1, characterized in that, Also includes: An insulating sheet (3) covering the surface of the CCS component (2).

6. The battery pack structure according to any one of claims 1-5, characterized in that, The insulation layer is a heat insulation structure composed of polyurethane coating or aerogel coating.

7. The battery pack structure according to any one of claims 1-5, characterized in that, The cover plate (1) has an installation port for installing the electrical component (8), and also includes a panel waterproof ring (11) that is arranged around the outside of the installation port and abuts against the electrical component (8).

8. The battery pack structure according to any one of claims 1-5, characterized in that, Also includes: A waterproof ring (6) is installed around the liquid cooling plate (5) and abuts against the cover plate (1).

9. The battery pack structure according to any one of claims 1-5, characterized in that, Also includes: A lifting component (12) that penetrates the cover plate (1) and is fixedly connected to the liquid cooling plate (5).

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