Battery module directional flow guide type anti-explosion valve splashing suppression plate and packaging method

Abstract

The invention belongs to the technical field of battery modules, and discloses a battery module directional diversion type anti-explosion valve splashing suppression plate and a packaging method.The battery module directional diversion type anti-explosion valve splashing suppression plate comprises a cover plate covering the battery module, the battery module comprises a battery cell assembly, a bus harness row and a shell, the cover plate is matched with the shell, and the cover plate is a heat-insulation and high-temperature-resistant plate; electrolyte spraying holes are uniformly formed in the cover plate, the electrolyte spraying holes correspond to anti-explosion valves of battery cell assemblies in the battery modules in position, and via holes are formed in the bus wiring harness row corresponding to the anti-explosion valves in position; the cover plate is of a layered composite structure and sequentially comprises a high-temperature-resistant heat conduction layer, a heat insulation buffer layer and a protective wear-resistant layer from bottom to top. According to the scheme, the heat-insulation and high-temperature-resistant cover plate is adopted, high-temperature heat can be effectively blocked, and compared with a common plastic partition plate, the better heat insulation effect is achieved. By reserving the electrolyte spraying hole, the electrolyte is prevented from being directly sprayed on the wire harness, the short circuit risk caused by electrolyte corrosion is reduced, and the safety is higher.

Description

Technical Field

[0001] The present invention relates to the technical field of battery modules, and more specifically, to a directional diversion type explosion-proof valve splash suppression plate for a battery module and a packaging method thereof. Background Art

[0002] With the rapid development of new energy vehicles and energy storage systems, lithium-ion batteries have been widely used due to their advantages such as high energy density and long cycle life. However, under abnormal conditions such as overcharging and overheating, lithium-ion batteries may experience thermal runaway, resulting in a sharp increase in the internal pressure of the battery cells. After the explosion-proof valve ruptures, the electrolyte splashes. In the traditional battery module design, the electrolyte often directly splashes onto the busbar harness row inside the module, causing the following problems: 1. The electrolyte corrodes the insulation layer of the harness, increasing the risk of short circuit; 2. The high-temperature electrolyte contacting the harness may trigger secondary thermal runaway; 3. The electrolyte accumulates inside the module, increasing the risk of thermal runaway propagation.

[0003] In the prior art, battery modules usually use ordinary plastic partitions as protective structures, which have problems such as insufficient heat insulation performance and inability to effectively guide the splashing direction of the electrolyte. Summary of the Invention

[0004] The purpose of the present invention is to solve the disadvantages existing in the prior art, and to propose a directional diversion type explosion-proof valve splash suppression plate for a battery module and a packaging method thereof.

[0005] To solve the above problems in the background art, the present invention adopts the following technical solutions: A directional diversion type explosion-proof valve splash suppression plate for a battery module, including a cover plate covering the battery module. The battery module includes a battery cell assembly, a busbar harness row, and a housing. The cover plate is adapted to the housing, and the cover plate is a heat-insulating and high-temperature-resistant plate; The cover plate is evenly provided with electrolyte spraying holes, and the electrolyte spraying holes correspond to the positions of the explosion-proof valves of the battery cell assembly in the battery module. Through holes are provided at the positions corresponding to the explosion-proof valves on the busbar harness row; The cover plate adopts a layered composite structure, and the cover plate is sequentially composed of a high-temperature-resistant heat-conducting layer, a heat-insulating buffer layer, and a protective wear-resistant layer from bottom to top.

[0006] As a further solution of the present invention: The material of the high-temperature-resistant heat-conducting layer is a high thermal conductivity ceramic material, which is used to quickly conduct the heat generated by the battery cells; The heat-insulating buffer layer is made of aerogel felt material, which is used to block heat transfer and buffer the possible impact generated by the battery cells; The protective wear-resistant layer is a polytetrafluoroethylene coating, which is used to prevent external wear and resist the corrosion of the electrolyte.

[0007] As a further solution of the present invention: an outwardly convex anti-backflow groove is provided on the surface of the cover plate corresponding to each electrolyte spraying hole, and the anti-backflow groove is integrally formed with the cover plate.

[0008] As a further solution of the present invention: the thickness of the high-temperature resistant heat-conducting layer is 0.5 - 2 mm, the thickness of the heat-insulating buffer layer is 2 - 5 mm, and the thickness of the protective wear-resistant layer is 0.1 - 0.5 mm As a further solution of the present invention: the aperture of the electrolyte spraying hole is 2 - 6 mm, and a liquid-repellent coating is provided on the pore wall of the electrolyte spraying hole. The liquid-repellent coating is a fluoropolymer coating, which is used to reduce the contact and adhesion between the electrolyte and the pore wall.

[0009] This solution also provides a packaging method for the directional diversion explosion-proof valve splash suppression plate of the battery module, including the following steps: S1. Install the battery cell assembly inside the housing of the battery module according to a predetermined arrangement method, and ensure that the position of the explosion-proof valve of the battery cell corresponds to the position of the electrolyte spraying hole on the cover plate; S2. Install the busbar harness row on the battery cell assembly and perform electrical connection; S3. Cover the cover plate with an anti-backflow groove above the battery module, and fix the cover plate on the housing of the battery module through a connecting piece; S4. Apply a sealant at the connection between the cover plate and the housing of the battery module to achieve the sealing of the battery module.

[0010] As a further solution of the present invention: the sealant is a silicone sealant that is resistant to high temperature and corrosion by electrolyte.

[0011] Compared with the prior art, the advantages of the present invention are as follows: This solution uses a heat-insulating and high-temperature resistant cover plate, which can effectively block high-temperature heat. Compared with ordinary plastic partitions, it has a better heat-insulating effect. By reserving electrolyte spraying holes, the direct spraying of electrolyte onto the wire harness is avoided, reducing the short-circuit risk caused by electrolyte corrosion and improving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a schematic structural diagram of the present invention; Figure 2 is of the present invention Figure 1 exploded view; Figure 3 is a schematic structural diagram of the anti-backflow groove of the present invention; Figure 4 is a schematic structural diagram of the cover plate of the present invention.

[0013] Explanation of the reference numerals in the drawings: 1. Battery module; 11. Battery cell assembly; 12. Busbar harness row; 121. Via hole; 13. Housing; 2. Cover plate; 21. High-temperature heat-conducting layer; 22. Heat-insulating buffer layer; 23. Protective wear-resistant layer; 3. Electrolyte spraying hole; 4. Anti-backflow groove. Detailed implementation manner

[0014] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention; obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention. Embodiment

[0015] Please refer to Figures 1-4 , the battery module directional diversion type explosion-proof valve splash suppression plate includes a cover plate 2 covering the battery module 1. The battery module 1 includes a battery cell assembly 11, a busbar harness row 12 and a housing 13. The cover plate 2 is adapted to the housing 13, and the cover plate 2 is a heat-insulating and high-temperature-resistant plate; electrolyte spraying holes 3 are evenly opened on the cover plate 2, and the electrolyte spraying holes 3 correspond to the positions of the explosion-proof valves of the battery cell assembly 11 in the battery module 1. Via holes 121 are opened on the busbar harness row 12 corresponding to the positions of the explosion-proof valves. The accurately aligned electrolyte spraying holes 3 cooperate with the explosion-proof valves to ensure the directional ejection of the electrolyte.

[0016] In this embodiment, a heat-insulating and high-temperature-resistant cover plate 2 is provided on the battery module 1 in the battery pack, which can effectively block high-temperature heat and has a better heat-insulating effect compared with ordinary plastic partitions. And electrolyte spraying holes 3 are reserved on the cover plate 2. When the explosion-proof valve of the battery cell bursts due to internal short circuit, the electrolyte will be ejected through the spraying holes instead of directly spraying on the wiring harness inside the battery module 1. This design can effectively prevent the wiring harness from short-circuiting due to electrolyte corrosion, thereby avoiding fires caused by short circuits. In addition, this design can also guide the safe discharge of the electrolyte, reduce the accumulation of the electrolyte inside the module, and further reduce the safety risk.

[0017] Among them, the cover plate 2 adopts a layered composite structure, and the cover plate 2 successively includes a high-temperature heat-conducting layer 21, a heat-insulating buffer layer 22 and a protective wear-resistant layer 23 from bottom to top.

[0018] Specifically, the material of the high-temperature heat-conducting layer 21 is a high heat-conducting ceramic material, which is used to quickly conduct the heat generated by the battery cell. The heat-insulating and buffering layer 22 is made of aerogel felt, which is used to block heat transfer and buffer the possible impact of the battery cell. The protective and wear-resistant layer 23 is a polytetrafluoroethylene coating, which is used to prevent external wear and resist the corrosion of the electrolyte. Among them, the thickness of the high-temperature heat-conducting layer 21 is 0.5 - 2 mm, the thickness of the heat-insulating and buffering layer 22 is 2 - 5 mm, and the thickness of the protective and wear-resistant layer 23 is 0.1 - 0.5 mm.

[0019] In addition, an outwardly convex anti-backflow groove 4 is provided on the surface of the cover plate 2 corresponding to each electrolyte spraying hole 3, and the anti-backflow groove 4 is integrally formed with the cover plate 2. The anti-backflow groove 4 forms a physical barrier to prevent the electrolyte remaining on the surface of the cover plate 2 from flowing back into the battery module 1 through the spraying holes. The aperture of the electrolyte spraying hole 3 is 2 - 6 mm, and a liquid-repellent coating is provided on the hole wall of the electrolyte spraying hole 3. The liquid-repellent coating is a fluoropolymer coating, which is used to reduce the contact and adhesion between the electrolyte and the hole wall. Embodiment

[0020] A packaging method for a directional flow-guiding explosion-proof valve splash suppression plate of a battery module includes the following steps: S1. Install the battery cell assembly 11 inside the housing 13 of the battery module 1 according to a predetermined arrangement method, and ensure that the position of the explosion-proof valve of the battery cell corresponds to the position of the electrolyte spraying hole 3 on the cover plate 2; S2. Install the busbar bundle row 12 on the battery cell assembly 11 and perform electrical connection; S3. Cover the cover plate 2 with the anti-backflow groove 4 above the battery module 1, and fix the cover plate 2 on the housing 13 of the battery module 1 through a connecting member; S4. Apply a sealant at the connection between the cover plate 2 and the housing 13 of the battery module 1 to seal the battery module 1. Among them, the sealant is a silicone sealant that is resistant to high temperature and electrolyte corrosion.

[0021] The above is only a preferred specific embodiment of the present invention; however, the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and its improved concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. The splash suppression plate of the directional flow guiding explosion-proof valve for the battery module includes a cover plate (2) covering the battery module (1). The battery module (1) includes a battery cell assembly (11), a bus bar row (12), and a housing (13), and is characterized in that: The cover plate (2) is adapted to the housing (13), and the cover plate (2) is a heat-insulating and high-temperature resistant plate; The cover plate (2) is evenly provided with electrolyte spraying holes (3), and the electrolyte spraying holes (3) correspond to the positions of the explosion-proof valves of the battery cells (11) in the battery module (1). Through holes (121) are provided in the busbar harness row (12) corresponding to the positions of the explosion-proof valves; The cover plate (2) adopts a layered composite structure. The cover plate (2) sequentially includes a high-temperature resistant and heat-conducting layer (21), a heat-insulating and buffering layer (22), and a protective and wear-resistant layer (23) from bottom to top.

2. The splash suppression plate of the battery module's directional flow explosion-proof valve according to claim 1, wherein: The high-temperature resistant and heat-conducting layer (21) is made of a high heat-conducting ceramic material and is used to quickly conduct the heat generated by the battery cells; The heat-insulating and buffering layer (22) is made of aerogel felt material and is used to block heat transfer and buffer the possible impact generated by the battery cells; The protective and wear-resistant layer (23) is a polytetrafluoroethylene coating and is used to prevent external wear and resist the corrosion of the electrolyte.

3. The splash suppression plate of the battery module's directional flow guiding explosion-proof valve according to claim 1, wherein: An outwardly convex anti-backflow groove (4) is provided on the surface of the cover plate (2) corresponding to each electrolyte spraying hole (3), and the anti-backflow groove (4) is integrally formed with the cover plate (2).

4. The splash suppression plate of the battery module's directional flow explosion-proof valve according to claim 1, characterized in that: The thickness of the high-temperature resistant and heat-conducting layer (21) is 0.5 - 2 mm, the thickness of the heat-insulating and buffering layer (22) is 2 - 5 mm, and the thickness of the protective and wear-resistant layer (23) is 0.1 - 0.5 mm.

5. The splash suppression plate of the battery module's directional flow guiding explosion-proof valve according to claim 3, wherein: The aperture of the electrolyte spraying hole (3) is 2 - 6 mm, and a liquid-repellent coating is provided on the hole wall of the electrolyte spraying hole (3). The liquid-repellent coating is a fluoropolymer coating and is used to reduce the contact and adhesion between the electrolyte and the hole wall.

6. The encapsulation method of the splash suppression plate of the battery module's directional flow guiding explosion-proof valve according to any one of claims 1-5, characterized in that: It includes the following steps: S1. Install the battery cell assembly (11) inside the housing (13) of the battery module (1) according to a predetermined arrangement method, and ensure that the position of the explosion-proof valve of the battery cell corresponds to the position of the electrolyte spraying hole (3) on the cover plate (2); S2. Install the busbar harness row (12) on the battery cell assembly (11) and perform electrical connection; S3. Cover the cover plate (2) with the anti-backflow groove (4) above the battery module (1), and fix the cover plate (2) on the housing (13) of the battery module (1) through a connecting member; S4. Apply a sealant at the connection between the cover plate (2) and the housing (13) of the battery module (1) to seal the battery module (1).

7. The encapsulation method of the splash suppression plate of the battery module directional flow explosion-proof valve according to claim 6, characterized in that: The sealant is a silicone sealant that is high-temperature resistant and resistant to electrolyte corrosion.

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