Battery pack and vehicle

Abstract

The invention discloses a battery pack and a vehicle. The battery pack comprises a battery module and a cooling device, each battery direct-connection group layer in the battery module at least comprises two battery direct-connection groups which are arranged side by side at intervals; the battery direct connection group comprises a battery cell stacking body, wherein the battery cell stack body comprises a plurality of soft package battery cells formed by series pole core groups, first pole lug brackets are arranged at two ends of each battery direct connection group, two adjacent battery direct connection groups which are arranged side by side are connected with the first pole lug brackets at the same end, and an accommodating space is defined between the two battery direct connection groups and the first pole lug brackets at the two ends; wherein the liquid cooling plate is attached to the battery direct connection group layer, the liquid cooling plate is arranged on the upper surface and/or the lower surface of the battery module, the liquid cooling plate and the accommodating space define an accommodating groove, the heat conduction plate is connected with the liquid cooling plate and inserted into the accommodating groove, the accommodating groove is sealed by another liquid cooling plate or protection plate, and heat conduction glue is arranged between the battery directconnection group and the heat conduction plate. The battery pack is simple in internal structure, high in unit volume capacity density, high in heat conduction efficiency and easy to adjust in height.

Description

technical field [0001] The invention belongs to the field of power batteries, and in particular relates to battery packs and vehicles. Background technique [0002] The performance of the liquid-cooled battery module directly determines the performance of the equipment that uses the liquid-cooled battery module as the power source. However, the design of the liquid cooling system for the pouch battery is difficult, and heat-conducting plates are often used to contact the pouch battery. The plate contacts one cell or two cells share a heat conduction plate, and the heat conduction plate conducts the heat of the cell from the thickness direction of the cell. This method not only has low heat conduction efficiency, but also increases the weight of the battery, and the more cells there are , the more the number of heat conduction plates, the more complicated the assembly. Moreover, the height of the battery pack is expected to be continuously reduced in the industry at present,...

AI Technical Summary

Problems solved by technology

[0002] The performance of the liquid-cooled battery module directly determines the performance of the equipment that uses the liquid-cooled battery module as the power source. However, the design of the liquid cooling system for the pouch battery is difficult, and heat-conducting plates are often used to contact the pouch battery. The plate contacts one cell or two cells share a heat conduction plate, and the heat conduction plate conducts the heat of the cell from the thickness direction of the cell. This method not only has low heat conduction efficiency, but also increases the weight of the battery, and the more cells there are , the more heat conducting plates, the more complex the assembly

Moreover, the industry expects the height of the battery pack to be continuously reduced, but the traditional pouch battery is often assembled vertically, so the height of the module is often high, and due to various requirements such as the manufacturing process and cost of the pouch battery, it cannot Reduced height, it is difficult to adapt to the requirement of reduced height of the battery system

In addition, since the length of the battery cell currently on the market is generally about 0.3 meters, there are many battery modules in the existing power battery pack, and each battery module needs to be added with a fixed structure, which is complicated to assemble. Power connections need to be made through peripheral power connectors, resulting in more battery installation structures, not only high cost, but also the overall weight of the battery pack is large and the space utilization rate is low, resulting in a low volume capacity density of the battery pack

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