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CN-122000578-A - Automobile battery pack adopting anti-offset battery cell fixing structure

CN122000578ACN 122000578 ACN122000578 ACN 122000578ACN-122000578-A

Abstract

The invention relates to the technical field of battery pack manufacturing and discloses an automobile battery pack adopting an anti-offset battery cell fixing structure, which comprises a battery module and a constraint piece, wherein the constraint piece comprises a pressing group arranged above a connecting sheet, a buffer plate is arranged in the middle of the top end of the pressing group, the buffer plate adopts a wave-shaped design, a cover plate is arranged at the top end of the buffer plate, springs are symmetrically arranged at four corners of the bottom end of the cover plate, and the bottom end of each spring is elastically connected with four corners of the top end of the pressing group. The invention is provided with the reinforcing plate and the pressing group, the reinforcing plate is in sliding connection with the pressing group and the supporting rod is in transmission connection with the positioning plate, so that the restraint part can drive the reinforcing plate and the side plate to finish the reinforcement of the side frame when being installed in place, the 'one-time assembly and double guarantee' is realized, the battery cell is all-dimensional restrained from the top end and the side, and the offset risk possibly occurring in single-dimensional restraint is avoided.

Inventors

  • YANG QIANG
  • YANG YANG

Assignees

  • 四川溜溜顺出行科技有限公司

Dates

Publication Date
20260508
Application Date
20260206

Claims (8)

  1. 1. An automobile battery pack adopting an anti-offset cell fixing structure, comprising: The battery module (1), battery module (1) is including electric core (11) of placing side by side, and the combination electric core (11) both ends are provided with end plate (12), and the combination electric core (11) both sides are provided with curb plate (13), end plate (12) and curb plate (13) enclose into rectangular frame, electric core (11) top is provided with connection piece (14), connection piece (14) top is provided with restraint (2); the restraint piece (2) comprises a pressing group (23) arranged above the connecting sheet (14), a buffer plate (22) is arranged in the middle of the top end of the pressing group (23), the buffer plate (22) is of a wave-shaped design, a cover plate (21) is arranged at the top end of the buffer plate (22), springs (24) are symmetrically arranged at four corners of the bottom end of the cover plate (21), and the bottom ends of the springs (24) are elastically connected with four corners of the top end of the pressing group (23); wherein, the inner wall of the bottom end of the pressing group (23) is embedded with a reinforcing plate (25) which reinforces the side edge of the rectangular frame surrounded by the end plate (12) and the side plate (13).
  2. 2. The automobile battery pack adopting the anti-offset cell fixing structure according to claim 1, wherein the pressing-down set (23) comprises a pressing plate (231), grooves (232) are formed in four corners of the top end of the pressing plate (231), the inner wall of each groove (232) is connected with the bottom end of a spring (24), and fixing blocks (233) are symmetrically fixed at the bottom end of the pressing plate (231).
  3. 3. The automobile battery pack adopting the anti-offset cell fixing structure according to claim 2, wherein a fixing groove (234) is formed in the side edge of the fixing block (233), a sliding plate is fixedly connected to the middle of the fixing groove (234), and a positioning groove (235) adopting a square design is formed in one end of the fixing groove (234).
  4. 4. The automobile battery pack adopting the anti-offset battery cell fixing structure according to claim 3, wherein a locating frame (236) is embedded in the inner wall of the locating groove (235), a magnetic piece (237) is arranged on one side of the locating frame (236), and a supporting rod (238) is arranged at one end, close to the fixing groove (234), of the magnetic piece (237).
  5. 5. The automobile battery pack adopting the anti-offset cell fixing structure according to claim 3, wherein the two ends of the reinforcing plate (25) are symmetrically provided with the channels (251), the channels (251) are in sliding connection with the sliding plate, one side, close to the joint of the end plate (12) and the side plate (13), of the reinforcing plate (25) is provided with the limit groove, and the inner wall of the limit groove is in sliding connection with the positioning plate (253).
  6. 6. The automobile battery pack adopting the anti-offset cell fixing structure according to claim 5, wherein the other end of the positioning plate (253) is fixedly connected with a side plate (252), an elastic layer is arranged on the outer wall of the side plate (252), the side plate (252) is completely embedded into the inner wall of the reinforcing plate (25) in an initial state, and the side edges of the reinforcing plate (25) and the side plate (252) are flush with the side edges of the fixing groove (234).
  7. 7. The automobile battery pack adopting the anti-offset cell fixing structure according to claim 4, wherein the reinforcing plate (25) is symmetrically provided with a circular groove (254) at one side close to the positioning groove (235), and the axial lead of the circular groove (254) is flush with the axial lead of the supporting rod (238).
  8. 8. The automobile battery pack adopting the anti-offset cell fixing structure according to claim 7, wherein one end of the supporting rod (238) far away from the positioning frame (236) is fixedly connected with one side of the positioning plate (253) close to the positioning groove (235).

Description

Automobile battery pack adopting anti-offset battery cell fixing structure Technical Field The invention relates to the technical field of battery pack manufacturing, in particular to an automobile battery pack adopting an anti-offset battery cell fixing structure. Background The automobile battery pack is a core energy unit of a new energy automobile and mainly comprises an electric core, a module, a battery pack box body, a matched battery management system, a thermal management system, a cooling device, an electric connection assembly and the like. The battery cells are the most basic energy storage carriers, a plurality of battery cells form a module through serial-parallel connection, and are integrated into a battery pack, and each system cooperatively ensures energy output and safe operation. In order to realize accurate positioning of the battery cell, the battery cell is suitable for volume expansion and contraction during charging and discharging of the battery cell, meanwhile, close fitting of the battery cell and a cooling system is guaranteed, and a fixing structure of the battery cell is a key for maintaining stability of the battery pack. In the actual use process, the battery cell can generate continuous uneven stress and repeated pulling, extruding and friction actions on the top constraint structure due to axial movement and transverse deflection generated by continuous vibration of vehicle running and inertial impact of acceleration braking, so that the multiple failure problem of the top constraint structure is caused. The axial float of the battery core can directly pull the top pressure plate and the fastening bolt to cause the attenuation of the pretightening force of the pressure plate and the loosening of the bolt, the joint surface of the pressure plate and the top of the battery core is abraded and sunken, the original tight constraint is changed into clearance fit, the transverse shift of the battery core can lead the busbar and the tab connecting piece to bear torsion and shearing stress, the welding point of the tab and the busbar is cracked, rosin joint and even falls off, and meanwhile, the problem that the clearance is enlarged and the positioning precision is lost due to repeated friction of the matching hole position of the top positioning pin and the pressure plate is also extruded and misplaced and damaged by the shifted battery core. The problems of the structure can directly cause the complete failure of the top constraint function, not only can the effective limit be formed on the battery cell, but also the deviation amplitude of the battery cell can be increased, and finally poor electrical contact and internal short circuit of the battery cell are caused, even thermal runaway is induced due to the breakage of the electrode lugs and the overheating of the battery cell, so that serious potential safety hazard is brought. Disclosure of Invention Aiming at the defects existing in the prior art, the invention provides the automobile battery pack adopting the anti-offset battery cell fixing structure, which can effectively solve the problems of loosening of a top constraint structure, cracking and failure of welding spots, positioning and attenuation of constraint functions caused by axial movement and transverse offset of a battery cell in the prior art. In order to achieve the above purpose, the invention is realized by the following technical scheme: The invention provides an automobile battery pack adopting an anti-offset battery cell fixing structure, which comprises: The battery module comprises cells which are arranged side by side, end plates are arranged at two ends of the combined cells, side plates are arranged at two sides of the combined cells, the end plates and the side plates enclose a rectangular frame, connecting pieces are arranged at the top ends of the cells, and restraining pieces are arranged above the connecting pieces; The restraining piece comprises a pressing group arranged above the connecting sheet, a buffer plate is arranged in the middle of the top end of the pressing group, the buffer plate is in wave-shaped design, a cover plate is arranged at the top end of the buffer plate, springs are symmetrically arranged at four corners of the bottom end of the cover plate, and the bottom ends of the springs are elastically connected with four corners of the top end of the pressing group; Wherein, the inner wall of the bottom end of the pressing group is embedded with a reinforcing plate for reinforcing the side edge of the rectangular frame surrounded by the end plate and the side plate. Further, the pressing group comprises a pressing plate, grooves are formed in four corners of the top end of the pressing plate, the inner walls of the grooves are connected with the bottom end of the spring, and fixing blocks are symmetrically fixed at the bottom end of the pressing plate. Further, the fixed slot has been seted up to the fixed block side, fixed slo