The embodiment of the invention discloses a protection device for a battery pack of a new energy truck. The device comprises three supporting sliding rails, a first primary energy absorption protection structure, a second primary energy absorption protection structure, a third primary energy absorption protection structure, a fourth primary energy absorption protection structure, a first secondary energy absorption protection structure, a second secondary energy absorption protection structure, three left battery pack supports, three right battery pack supports, six ranging radars and a vehicle-mounted ECU. A plurality of energy-absorbing protection structures are arranged between a longitudinal beam and the battery pack supports, and each battery pack support is connected with a corresponding supporting slide rail through a shearing bolt, so that when the side surface of a battery pack is impacted, the shearing bolt below the impact position of the impacted battery pack is sheared off, the corresponding battery pack support moves along the corresponding supporting slide rail and extrudes the corresponding energy absorption protection structure, the corresponding energy absorption protection structure is subjected to compression deformation to absorb energy generated by external force to achieve the effect of protecting the battery pack, and the safety performance of the battery pack in the collision process of the side face of the new energy truck is improved.

本发明实施例公开一种新能源货车电池包的保护装置。该装置包括三个支撑滑轨、第一一级吸能保护结构、第二一级吸能保护结构、第三一级吸能保护结构、第四一级吸能保护结构、第一二级吸能保护结构、第二二级吸能保护结构、三个左电池包支架、三个右电池包支架、六个测距雷达和车载ECU，通过在纵梁和电池包支架之间设置多个吸能保护结构，且每个电池包支架与对应的支撑滑轨通过剪切螺栓连接的方式，使电池包的侧面受到撞击时，被撞击的电池包的撞击位置下方的剪切螺栓被剪断，电池包支架沿着支撑滑轨移动并挤压吸能保护结构，吸能保护结构发生压缩变形吸收外力产生的能量达到保护电池包的作用，提高电池包在新能源货车侧面发生碰撞过程中的安全性能。