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CN-115360473-B - Base of battery module protector, end plate and battery pack

CN115360473BCN 115360473 BCN115360473 BCN 115360473BCN-115360473-B

Abstract

The invention relates to a base of a battery module protecting device, a protecting device, an end plate and a battery pack, wherein the base is used for being matched with a protective cover to form the protecting device capable of insulating and protecting an output electrode of the battery module; the battery module output pole and the base can be penetrated by a fixing piece, and the battery module output pole is characterized in that the base comprises a cover matching seat, a fixing matching piece is arranged in the cover matching seat, the fixing matching piece is limited by the cover matching seat in the horizontal direction and can move upwards relative to the cover matching seat, a screw hole for being in threaded connection with the fixing piece is formed in the fixing matching piece, the fixing piece abuts against the battery module output pole, and when the fixing piece penetrates into the fixing matching piece and rotates axially along the fixing height, the fixing matching piece can apply acting force to the cover matching seat through the threaded connection relation between the fixing piece and the fixing piece, and can move upwards relative to the cover matching seat under the action of the reactive force applied by the cover matching seat.

Inventors

  • GUAN HUIPING
  • DONG LINA
  • LIN WEIFANG
  • Wu Hanhai

Assignees

  • 浙江极氪智能科技有限公司
  • 威睿电动汽车技术(宁波)有限公司
  • 浙江吉利控股集团有限公司

Dates

Publication Date
20260505
Application Date
20220902

Claims (10)

  1. 1. A base of a battery module protection device is used for being matched with a protective cover (2) to form a protection device capable of insulating and protecting a battery module output electrode, the battery module output electrode and the base (3) can be penetrated by a fixing piece (4), and the battery module protection device is characterized in that the base (3) comprises a cover matching seat (31), a fixing matching piece (5) is arranged in the cover matching seat (31), the fixing matching piece (5) is limited by the cover matching seat (31) in the horizontal direction and can move upwards relative to the cover matching seat (31), a threaded connection hole (50) used for being in threaded connection with the fixing piece (4) is formed in the fixing matching piece (5), the fixing piece (4) abuts against the battery module output electrode, and when the fixing piece (4) penetrates into the fixing matching piece (5) and rotates axially along the fixing height, the fixing matching piece (5) can exert acting force on the cover matching seat (31) through the threaded connection relation between the fixing matching piece and the fixing piece (4) and exert the acting force on the cover matching seat (31) under the action of the acting force of the counter acting force of the cover matching seat (31).
  2. 2. The base of a battery module protection device according to claim 1, wherein the screw hole (50) is arranged along the up-down direction, the cover matching seat (31) is provided with a containing groove (311) capable of containing the cover matching seat (31), the base (3) further comprises a limiting piece (6), the limiting piece (6) is arranged on the cover matching seat (31) and can be clamped with the fixed matching piece (5) to limit the upward movement stroke of the fixed matching piece (5), the battery module output pole comprises a diversion row, and the upward movement stroke of the fixed matching piece (5) is configured to enable the upward movement stroke to be abutted with the diversion row.
  3. 3. The base of the battery module protection device according to claim 2, wherein the receiving groove (311) includes a groove body (3111), a plurality of ribs (3112) are formed protruding from an inner wall of the groove body (3111) toward a center of the groove body (3111), the ribs (3112) are spaced apart from each other, and the plurality of ribs (3112) enclose a structure capable of restricting the fixing fitting (5) in a horizontal direction.
  4. 4. The base of a battery module protection device according to claim 2, wherein the limiting piece (6) comprises a pin handle (61) and a pin rod (60) which are connected with each other, the pin rod (60) extends along the horizontal direction, the cover matching seat (31) is provided with a matching inlet (313) communicated with the accommodating groove (311) and a jack (312) positioned at one side of the fixed matching piece (5), the fixed matching piece (5) is provided with a long hole (51) horizontally penetrating through the fixed matching piece, the pin handle (61) can be matched with the matching inlet (313), and the pin rod (60) can extend into the long hole (51) through the matching inlet (313) and is clamped into the jack (312), so that the fixed matching piece (5) can move up and down relative to the cover matching seat (31) and cannot be separated from the cover matching seat (31).
  5. 5. The base of a battery module protection device according to claim 2, wherein the accommodating groove (311) can form an opening in the cover matching seat (31), the opening is used for allowing the fixed matching piece (5) to be placed in the cover matching seat (31) along the horizontal direction, the fixed matching piece (5) comprises at least two screwing units (522), a matching groove (521) which is sunken relative to the screwing units (522) is arranged between the screwing units (522), the screwing units (522) are provided with the screwing holes (50), the cover matching seat (31) is provided with a matching hole (3113) which can be used for the screwing units (522) to pass through, the matching hole (3113) is arranged along the up-down direction and communicated with the accommodating groove (311), the limiting piece (6) is arranged between the matching holes (3113), the limiting piece (6) can be matched with the matching groove (521), and the matching hole (3113) and the limiting piece (6) can be matched with the fixed piece (5) along the horizontal direction.
  6. 6. The base of the battery module protection device according to claim 5, further comprising a plug member (33), the plug member (33) comprising a plate-like portion (331) and a closing portion (332) connected to each other, the plate-like portion (331) being located under the fixing mating member (5), the closing portion (332) being capable of closing an opening in the cover mating seat (31) into which the fixing mating member (5) is placed.
  7. 7. The base of the battery module protecting device according to claim 5, wherein the receiving groove (311) has a convex-shaped cross section, the fixing engaging member (5) includes a body (52) and a flange (53) protruding outwardly from front and rear surfaces of a lower portion of the body (52), a third gap (9) is provided between a bottom wall of the engaging groove (521) and a bottom surface of the stopper (6), a fourth gap (10) is provided between a top surface of the flange (53) and the receiving groove (311), and one of the third gap (9) and the fourth gap (10) having a smaller value in an up-down direction is a stroke in which the fixing engaging member (5) can move upward.
  8. 8. A protective device, characterized by comprising a base (3) of a battery module protective device according to any one of claims 1-7.
  9. 9. End plate, characterized in that it is integrated with the base (3) of a battery module protection device according to any one of claims 1-7.
  10. 10. Battery pack, characterized by comprising a base (3) of a battery module protection device according to any of claims 1-7.

Description

Base of battery module protector, end plate and battery pack Technical Field The invention relates to the field of battery pack preparation, in particular to a base of a battery module protecting device, a protecting device, an end plate and a battery pack. Background The minimum unit in the power battery system is an electric core, a plurality of electric cores can form a battery module, and a plurality of battery modules can form a battery pack. The battery module comprises a battery module body, a plurality of battery cells, a pair of end plates, at least one guide bar and a plurality of metal guide bars, wherein the end plates are positioned on the outer sides of the battery cells positioned at the end parts of the battery module body, the metal guide bars are welded on positive and negative poles of the battery cells, the battery cells are electrically connected through the guide bars, at least one guide bar protruding out of the battery cells is arranged on the battery cell closest to the end plates, part of the guide bar protruding out of the battery cells extends to the position of the end plates, one end of each guide bar is electrically connected with one end of each bar-shaped copper bar to form an output pole of the battery module body, and meanwhile, the other end of each bar-shaped copper bar is electrically connected with the guide bars in other battery module bodies, so that an electrical connection relation between the battery module bodies is constructed. In the related art, the guide bar and the copper bar are conductors and belong to high-voltage devices, so that a protective device mainly made of insulating materials (such as plastics) is arranged at the joint of the guide bar and the copper bar, the protective device can be covered on the outer side of the joint of the guide bar and the copper bar to insulate and protect the joint, a supporting platform can be provided for the joint of the guide bar and the copper bar, and after the protective device, the guide bar and the copper bar are assembled with the guide bar and the copper bar, and the guide bar and the copper bar are penetrated in the protective device and have partial structures extending into the protective device and partial structures extending out of the protective device. In view of the above, the protection device generally includes a protection cover and a base, which are detachably connected, wherein a fixing matching piece capable of being in threaded connection with a fixing piece such as a bolt is embedded in the base, and when the protection cover is connected with the base, a protection cover is arranged on the outer side of a connection part of the guide bar and the copper bar, the base provides a supporting platform for the connection part of the guide bar and the copper bar, the assembly steps of the guide bar, the copper bar and the base generally include that the guide bar extends onto the base and is attached to the base, the copper bar is stacked on the part of the guide bar, and the fixing piece such as a bolt sequentially penetrates the copper bar, the guide bar and the fixing matching piece from top to bottom and is screwed, so that the fixing piece is in threaded connection with the copper bar, the guide bar and the fixing matching piece at different parts of the fixing piece, and therefore the connection part of the copper bar and the guide bar can be ensured to be positioned in the protection device, and covered by the protection device. In the assembly steps, the guide bar is attached to the base, so that the guide bar cannot deform unacceptably in the process of tightening the fixing piece, and the copper bar and the guide bar are tightly and firmly connected by tightening the fixing piece, so that the reliability of assembly connection between the copper bar and the guide bar is guaranteed, and the method is an extremely important key point in the battery pack assembly process. Based on this, this arrangement has a disadvantage in that since the fixing fitting is generally fixed to the base by a method such as insert molding, the position of the fixing fitting within the base is fixed, and when the guide bar cannot be well fitted to the fixing fitting by itself due to the manufacturing tolerance and the assembly tolerance, the arrangement easily causes difficulty in assembling the guide bar and the copper bar, and affects the reliability of the assembly connection between the guide bar and the copper bar. As described in more detail, in the related art, when the portion of the current bar protruding from the battery cell is generally short, and the current bar can extend onto the base but cannot be well attached to the base, but there is still a millimeter (e.g., 1-3 mm) gap between them, if the assembly steps of the copper bar, the current bar and the base are performed as usual, in order to screw the fixing member, the worker needs to exert more force to complete the operation action, so that th