Module cover plate equipment for power battery

Abstract

The utility model relates to the field of power battery equipment, in particular to module cover plate equipment for a power battery, which comprises a module cover plate fixedly arranged at the top end of a power battery module, a cavity is formed in the module cover plate, and inert gas is filled in the cavity; a through hole is formed in one side, facing the battery module, of the cavity, a plurality of balance valves are arranged in the through hole, and an exhaust space with a preset height is arranged between the bottom of the module cover plate and the top of the battery module. Inert gas is automatically sprayed out to extinguish fire, fire extinguishment is faster and more reliable, the safety accident that a whole vehicle is burnt out due to thermal runaway is reduced, and the safety of a power battery is improved.

Description

Technical Field

[0001] The utility model relates to the field of power battery equipment, in particular to module cover equipment for power batteries. Background Art

[0002] Power batteries are an important source of power for electric vehicles, electric trains, electric bicycles, etc. Power batteries are generally formed by combining multiple cells in series or in parallel, packaging them into battery modules, and then combining multiple battery modules into battery packs. During the use of power batteries, some abnormalities or failures may occur due to the use conditions, use environment, etc., so some module protection measures need to be designed during the production and manufacturing process of power batteries.

[0003] The protection measures for power batteries are usually set from the aspects of protection location and materials of protection structure. However, the heat loss of battery modules is fast under low temperature conditions, which greatly reduces the power battery's performance such as power and charge and discharge capacity at low temperatures, greatly inhibits the performance of batteries, and reduces user experience; uneven temperature distribution and poor module temperature distribution will shorten the life of lithium batteries, inhibit the battery capacity, and increase the difficulty of thermal management; in order to reliably fix the battery cell to the module cover, structural adhesive is usually used for bonding, which greatly increases the difficulty of module repair; in terms of thermal safety of power batteries, there is no reliable fire extinguishing measure for power battery packs after thermal runaway occurs. Although it can ensure the safety of the driver, it cannot avoid the loss of vehicles and batteries. Utility Model Content

[0004] The utility model aims to provide a module cover device for a power battery, so as to solve the problem that there is no reliable fire extinguishing measure in the case of thermal runaway of the power battery.

[0005] The module cover plate device for a power battery in this solution comprises a module cover plate fixedly mounted on the top of the power battery module, wherein a cavity is formed in the module cover plate, and the cavity is filled with an inert gas;

[0006] A through hole is provided on the side of the cavity facing the battery module, a plurality of balancing valves are provided in the through hole, and an exhaust space of a preset height is provided between the bottom of the module cover plate and the top of the battery module.

[0007] The beneficial effects of this program are:

[0008] By filling the cavity in the module cover with inert gas and allowing the module cover to sense the heat conditions of the battery module, when thermal runaway occurs, the inert gas in the cavity expands due to heat, prompting the balancing valve to open, allowing the inert gas to automatically spray out to extinguish the fire. This makes fire extinguishing faster and more reliable, reduces safety accidents caused by thermal runaway and burning of the entire vehicle, and improves the safety of the power battery.

[0009] Furthermore, an adhesive area with a preset width is provided around the module cover plate, the adhesive area is staggered with the cavity area, and the adhesive area is aligned with the upper edge of the power battery module.

[0010] The beneficial effect is that, by setting the adhesive area, the stability of the module cover plate fixation can be improved without blocking the cavity area.

[0011] Furthermore, the preset width is greater than 10 mm.

[0012] The beneficial effect is that the adhesive area has a certain width, which can achieve stable fixation of the module cover and improve the stability of the overall equipment.

[0013] Furthermore, the preset height is 2.5-3.2 mm.

[0014] The beneficial effect is that the preset height will not be too large, ensuring the rapid and complete conduction of heat under thermal runaway conditions. At the same time, a certain conduction space is formed to ensure that heat can be conducted.

[0015] Furthermore, the module cover is provided with a plurality of bolts that can be fixed to the box side beams, and the bolts are located at the corners of the module cover.

[0016] The beneficial effect is that the reliability of the overall structure is enhanced through the fixing method of structural adhesive and bolts.

[0017] Furthermore, a heat-insulating layer is provided at the bottom of the module cover plate, and a rubber blocking strip for separation is provided between the heat-insulating layer and the adhesive area.

[0018] The beneficial effect is that the thermal insulation layer can play a role in thermal insulation, and the inert gas also has a thermal insulation effect, which strengthens the thermal insulation and temperature uniformity of the module as a whole.

[0019] Furthermore, two balancing valves are provided, and the balancing valves are located at two sides of the cavity area.

[0020] The beneficial effect is that the setting of the two balancing valves can accurately and quickly supply the inert gas to extinguish the fire, and the fire is extinguished more quickly and timely. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a front view of an embodiment of a module cover device for a power battery according to the utility model. DETAILED DESCRIPTION

[0022] The following is further explained in detail through specific implementation methods.

[0023] The reference numerals in the drawings of the specification include: module cover 1, cavity 2, balancing valve 3, insulation layer 4, battery module 5, bolt 6, adhesive area 7, box side beam 8.

[0024] Example

[0025] Module cover equipment for power batteries, such as Figure 1 As shown: it includes a module cover plate 1 fixed on the top of the power battery module 5. The battery module 5 is designed as a large module structure. The soft-pack battery cells are stacked along the X direction of the whole vehicle, and the tabs are extended in the Y direction on both sides. After the tabs are welded, the FPCs on both sides are sampled to guide the battery cells to exhaust toward the module and the top.

[0026] A cavity 2 is provided in the module cover 1, and the cavity 2 is filled with an inert gas. The filling amount of the inert gas is set according to actual needs. A through hole is provided on the side of the cavity 2 facing the battery module 5, and a plurality of balancing valves 3 are installed in the through hole. The balancing valve 3 can use an existing small air pressure valve, such as a balancing valve of the VV-M062-00-111 model. Two balancing valves 3 are provided, and the balancing valves 3 are located on both sides of the cavity 2 area. An exhaust space of a preset height is formed between the bottom of the module cover 1 and the top of the battery module 5, that is, the exhaust space is located between the module cover 1 and the battery module 5, and the preset height is 2.5-3.2 mm. The preset height of this embodiment is set to 3 mm.

[0027] The module cover 1 is bonded with an adhesive area 7 of a preset width, which is greater than 10 mm. The adhesive area 7 is offset from the cavity 2 area, that is, the adhesive area 7 does not overlap with the cavity 2 area. The adhesive area 7 is aligned with the upper edge of the power battery module 5, that is, it is connected to the upper edge of the battery module with structural adhesive. The bottom of the module cover 1 is bonded with a thermal insulation layer 4, and a separation strip is bonded between the thermal insulation layer 4 and the adhesive area 7.

[0028] The module cover plate 1 is equipped with a plurality of bolts 6 that can be fixed to the box side beams 8 . The bolts 6 are located at the corners of the module cover plate 1 . For example, four bolts 6 are provided and located at the four corners of the module cover plate 1 .

[0029] The specific implementation process is as follows:

[0030] On the actual battery module 5, the module cover 1 is fixed to the upper edge of the power battery module 5 by the double-sided adhesive in the adhesive area 7, and then the module cover 1 is fastened to the box side beam 8 by bolts 6. The box is the external structure that supports the battery module 5. The box processing technology is aluminum profile extrusion and cross beam stamping. The module cover 1 is fastened to retain the feasibility of cell repair. The inert gas in the cavity 2 in the module cover 1 also has a heat preservation effect, which strengthens the heat preservation and temperature uniformity of the module as a whole. Compared with ordinary air, the inert gas has a greater density and a smaller thermal conductivity. This characteristic enables the inert gas to slow down the flow of heat from the high temperature area to the low temperature area, thereby achieving the purpose of heat preservation. The module cover 1 as a whole can optimize the thermal field around the module to achieve the purpose of temperature uniformity. When the battery module 5 produces thermal runaway, the heat is conducted to the module cover 1, causing the inert gas in the cavity 2 in the module cover 1 to expand due to the heat, thereby opening the balancing valve 3 and ejecting the inert gas to extinguish the fire. The fire extinguishing is faster and more reliable, reducing the safety accidents caused by thermal runaway and burning of the whole vehicle, and improving the safety of the power battery.

[0031] The above is only an embodiment of the utility model, and the common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the utility model, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A module cover plate device for power batteries, characterized in that: It includes a module cover plate fixedly mounted on the top of the power battery module, wherein a cavity is formed in the module cover plate, and the cavity is filled with an inert gas; A through hole is provided on the side of the cavity facing the battery module, a plurality of balancing valves are provided in the through hole, and an exhaust space of a preset height is provided between the bottom of the module cover plate and the top of the battery module.

2. The module cover plate device for power batteries according to claim 1, characterized in that: An adhesive area with a preset width is arranged around the module cover plate, the adhesive area is staggered with the cavity area, and the adhesive area is aligned with the upper edge of the power battery module.

3. The module cover plate device for power batteries according to claim 2, characterized in that: The preset width is greater than 10 mm.

4. The module cover plate device for power batteries according to claim 1, characterized in that: The preset height is 2.5-3.2 mm.

5. The module cover plate device for power batteries according to claim 2, characterized in that: The module cover is provided with a plurality of bolts that can be fixed to the box body side beams, and the bolts are located at the corners of the module cover.

6. The module cover plate device for power batteries according to claim 5, characterized in that: A heat-insulating layer is arranged at the bottom of the module cover plate, and a rubber blocking strip for separation is arranged between the heat-insulating layer and the adhesive area.

7. The module cover plate device for power batteries according to claim 1, characterized in that: Two balancing valves are provided, and the balancing valves are located at two sides of the cavity area.

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