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EP-4507095-B1 - BATTERY PACK CASE AND BATTERY PACK

EP4507095B1EP 4507095 B1EP4507095 B1EP 4507095B1EP-4507095-B1

Inventors

  • WEI, Yixing
  • LUO, Zihao
  • ZENG, SIHAN

Dates

Publication Date
20260506
Application Date
20230913

Claims (13)

  1. A battery pack, comprising cells (5), a protection plate (6) and a battery pack case, wherein the battery pack case comprises a frame body (1) and a cover plate (2), the frame body (1) comprises partition strips (11), and the frame body (1) is provided with an accommodating position for a protection plate (13) defined by the partition strips (11); the cover plate (2) is assembled on an upper opening of the accommodating position for the protection plate (13); the partition strips (11) are provided with first protrusions (131) and second protrusions (132) at a top end thereof, and the second protrusions (132) are located on an outer side of the first protrusions (131) and are higher than the first protrusions (131); and an edge of the cover plate (2) is limited to inner sides of the second protrusions (132) and is supported on the first protrusions (131), and a lower end of the edge of the cover plate (2) is fixedly connected to upper ends of the first protrusions (131) in a manner of laser welding; the protection plate (6) is disposed in the accommodating position for the protection plate (13), the cells (5) are disposed in the accommodating positions for the cells (14) of the battery pack case, and the cells (5) are electrically connected to the protection plate (6); characterized in that , the battery pack further comprises a label (3) and a polycarbonate (PC) sheet (4), the label (3) wraps an outer surface of the battery pack case, and the PC sheet (4) is adhered to a bottom surface of the battery pack case.
  2. The battery pack according to claim 1, wherein the first protrusions (131) and/or the second protrusions (132) are continuously disposed on the partition strips (11).
  3. The battery pack according to claim 1, wherein a plurality of the first protrusions (131) and/or a plurality of the second protrusions (132) are discretely disposed on the partition strips (11).
  4. The battery pack according to claim 1, wherein the frame body (11) is further provided with a plurality of accommodating positions for the cells (14), the plurality of the accommodating positions for the cells (14) are arranged in a left-right side-by-side manner, and the accommodating position for the protection plate (13) is located at a rear side of the plurality of accommodating positions for the cells (14) and stretches across the plurality of the accommodating positions for the cells (14).
  5. The battery pack according to claim 4, wherein a front side section of the partition strips (11) is provided with at least one communication groove (134), and the front side section is a portion of the partition strips (11) located between the accommodating position for the protection plate (13) and the plurality of the accommodating positions for the cells (14).
  6. The battery pack according to claim 5, wherein the at least one communication groove (134) comprises N communication grooves (134), the plurality of the accommodating positions for the cells (14) comprise N accommodating positions for the cells (14), and the N communication grooves (134) are in one-to-one correspondence with the N accommodating positions for the cells (14), wherein N is an integer greater than 1.
  7. The battery pack according to claim 5 or claim 6, wherein a portion of the front side section without the communication groove (134) is provided with the first protrusions (131).
  8. The battery pack according to any one of claims 1 to 7, wherein in a case that the cover plate (2) is supported on upper surfaces of the first protrusions (131), before welding, an upper surface of the cover plate (2) is higher than an upper end of the second protrusions (132).
  9. The battery pack according to claim 8, wherein after welding, a height difference between the upper surface of the cover plate (2) and the upper end of the second protrusions (132) is less than 0.02 mm.
  10. The battery pack according to any one of claims 1 to 9, wherein a longitudinal section of the first protrusions (131) is trapezoidal, and a groove (133) is provided between the first protrusions (131) and the second protrusions (132).
  11. The battery pack according to any one of claims 1 to 10, wherein an edge of a rear side of the cover plate (2) is provided with a positioning strip (20) protruding downwards, and a height of the positioning strip (20) is greater than a height of the first protrusions (131); and when the cover plate (2) is supported on an upper surface of the first protrusions (131), the positioning strip (20) abuts against and fits with an inner side of the first protrusions (131).
  12. The battery pack according to any one of claims 1 to 11, wherein at least one partition groove (1311) is provided on the first protrusions (131), so that a sinking depth of the cover plate (2) after the laser welding of the frame body (1) and the cover plate (2) is limited.
  13. The battery pack according to any one of claims 1 to 12, wherein on a side edge section of the partition strips (11), an embedding groove (15) is provided between the first protrusions (131) and the second protrusions (132), the side edge section is a portion of the partition strips (11) located at a left side and a right side of the accommodating position for the protection plate (13), a left side and a right side of the cover plate (2) are provided with ribs (21) in a protruding manner, and the ribs (21) fit with the embedding groove (15), and when the cover plate (2) is assembled on an upper end opening of the accommodating position for the protection plate (13), the ribs (21) are embedded into the embedding groove (15).

Description

TECHNICAL FIELD The present application relates to the field of battery technologies, and in particular, to a battery pack. BACKGROUND In recent years, with the rapid development of mobile communication industries and electronic products, polymer lithium-ion batteries have been widely used due to a variety of obvious advantages such as large capacity, a small volume, high safety, low cost and the like. For example, notebook computers mainly use a lithium-ion polymer battery. A conventional notebook computer battery includes a polymer cell, a battery protection plate, a plastic frame body and a cover plate of a protection plate and the like. The cover plate of the protection plate is fixed to the frame body in a snap-fit manner, and there are some defects in this manner. For example, in this manner, a snap fit force of a simple buckle is insufficient, while a complex buckle will significantly occupy a space of a battery pack case, which requires the battery pack case to be made relatively large to avoid occupying a space of a battery protection plate and other components. In addition, the complex buckle will improve design and processing cost of an injection mold. KR1020220068648A discloses an assembly structure of a battery module casing. The assembly structure of the battery module casing is a box-shaped assembly structure for accommodating a plurality of battery cells by assembling a casing, a cover, and two end plates on both sides together. Two ends of a bottom plate of the casing are bent upward at a right angle to form two side plates. Snap-fit grooves are formed on inner side surfaces of top portions of the two side plates along a longitudinal direction. The cover is snapped into place by inserting both of its side ends into the snap-fit grooves formed on the two side plates of the casing. Assembly is completed by performing laser welding on corner portions between the inner surface of the top portion of each side plate of the casing and an upper surface on the two side ends of the cover. CN212967840U discloses a power battery. The power battery includes a top cover and a housing. The housing has a structure with one end having an opening. A step is provided on an inner wall of the housing. The step is arranged around the inner wall of the housing. A groove is provided on a side of the step close to the inner wall of the housing. The top cover is mounted on the opening. The top cover abuts against the step and covers the groove. The top cover is welded to the housing. In the aforementioned power battery, the step is provided on the inner wall of the housing. The step is arranged around the inner wall of the housing. The groove is provided on the side of the step close to the inner wall of the housing. The top cover is mounted on the opening. The top cover abuts against the step and covers the groove. The top cover is welded to the housing. The step can avoid laser leakage during laser welding of the top cover and the housing, and thereby preventing the laser from reaching internal structures during, thereby preventing an internal structure of the battery from being burned. Simultaneously, the groove on the step can receive welding spatter generated during the laser welding process, thereby preventing the welding spatter from falling into the housing. Consequently, the insulation and safety performance of the battery are effectively enhanced. US 2015/0228936 Al discloses a prismatic secondary battery includes a battery case in a prismatic shape and a battery cover which seals up an opening part of the battery case. The battery cover has a convex part which projects toward the inside of the battery case, faces an inner surface of a side wall part of the battery case, and extends continuously along the entire periphery of the side wall part. Cover thickness of a contact part of the battery cover which is in contact with the upper end of the side wall part of the battery case at a position outside the convex part is greater than 14 of cover thickness of a blockage part blocking up an opening part at a position inside the convex part and is less than the cover thickness of the blockage part. US 2002/182480 A1 discloses a pack for batteries, such as capacitors, is designed for ease of manufacture and installation of components in the case with vertical motions to provide an efficient and cost-effective assembly. An exemplary embodiment has a molded case and cover in which all of the internal components are installed in the case through the open top without requiring fasteners, tools, or additional supporting parts. The components include a flexible circuit on a flexible plastic sheet carrying control and sensor circuitry and temperature sensors together with internal and external connectors. Buss bars and connecting terminals mount in vertical slots and include prongs that extend through flexible flap connectors into guide recesses to provide connections to the flexible circuit. Batteries with vertical bla