Search

CN-224217562-U - Battery shell, battery and battery pack

CN224217562UCN 224217562 UCN224217562 UCN 224217562UCN-224217562-U

Abstract

The utility model relates to the technical field of batteries, and particularly discloses a battery shell, a battery and a battery pack. The battery shell comprises a shell body and a blue film, wherein the blue film is coated on the outer side wall of the shell body, the outer side wall of the shell body is provided with a plurality of shell planes, each two shell planes are connected through a transition curved surface, one of all the transition curved surfaces is defined as a corner curved surface, the head end of the blue film and the tail end of the blue film are overlapped to form an overlapped part, the overlapped part is arranged on the corner curved surface, and the overlapped part does not exceed the adjacent shell plane. The battery shell limits the overlapping part to the corner curved surface so as to improve the energy density of the battery, enhance the reliability of blue film coating, improve the production yield, simplify the coating process and improve the structure and mode of the blue film coating of the battery shell.

Inventors

  • HAN BO
  • CHEN KAI
  • LI ZHENG
  • FENG YUCHUAN

Assignees

  • 苏州清陶新能源科技有限公司

Dates

Publication Date
20260508
Application Date
20250430

Claims (10)

  1. 1. The battery shell is characterized by comprising a shell body (100) and a blue film (200), wherein the blue film (200) is coated on the outer side wall of the shell body (100), the outer side wall of the shell body (100) is provided with a plurality of shell planes, every two shell planes are connected through a transition curved surface, one of the transition curved surfaces is defined as a corner curved surface (101), the head end of the blue film (200) and the tail end part of the blue film (200) are overlapped to form an overlapped part, the overlapped part is arranged on the corner curved surface (101), and the overlapped part does not exceed the adjacent shell planes.
  2. 2. The battery case according to claim 1, wherein an end face of a leading end of the blue film (200) is provided obliquely, a thickness of the leading end of the blue film (200) increases first and then remains unchanged in a direction toward a trailing end of the blue film (200), and the trailing end of the blue film (200) is bonded to the end face of the leading end of the blue film (200).
  3. 3. The battery case according to claim 2, wherein the inclination angle of the leading end face of the blue film (200) is θ,60 ° < θ <80 °.
  4. 4. The battery case according to claim 1, wherein the case body (100) is rectangular, the radius of the transition curved surface other than the corner curved surface (101) is R1, and the radius of the corner curved surface (101) is R2, R1< R2.
  5. 5. The battery case according to claim 4, wherein R2 is 0.5w or less, w being the width of the case main body (100).
  6. 6. The battery case according to any one of claims 1 to 5, wherein an outer surface of the case body (100) is provided with a roughened layer.
  7. 7. The battery is characterized by comprising a battery core (300) and the battery shell according to any one of claims 1-6, wherein the thicknesses of the side walls of the battery shell are equal everywhere, the battery core (300) is arranged in the battery shell, and the inner wall surface corresponding to the corner curved surface (101) is partially fit and attached with the battery core (300).
  8. 8. The battery according to claim 7, wherein the battery cell (300) is a winding battery cell (301), the winding battery cell (301) comprises a straight section (3011) and two circular arc sections (3012), the two circular arc sections (3012) are respectively arranged at two ends of the straight section (3011), and the inner wall surface corresponding to the corner curved surface (101) is partially fit and attached to one circular arc section (3012).
  9. 9. The battery according to claim 8, wherein the corner curved surface (101) has a radius R2, R2 being half the thickness of the wound cell (301).
  10. 10. Battery pack, characterized in that it comprises a plurality of batteries according to any one of claims 7-9, all of said batteries being arranged in a matrix.

Description

Battery shell, battery and battery pack Technical Field The utility model relates to the technical field of batteries, in particular to a battery shell, a battery and a battery pack. Background In the field of battery manufacturing, insulating protection of batteries is critical. At present, it is common practice to coat a blue film on the casing of the battery, so as to prevent the battery from being electrically connected with other structures to cause short circuit. As shown in fig. 1 and 2, a loop-type coating method is widely used in the industry to coat the blue film 200 'on the housing main body 100', and this method is to make the two ends of the blue film 200 'end to end form an overlapping portion, so as to realize the overall coating of the side wall of the housing main body 100'. However, this approach has significant drawbacks. Since the overall size of the battery is required to meet the production requirements, when the length and width of the case main body 100' are fixed, the overlapping portion of the blue film 200' from the beginning to the end occupies a certain space in the width direction of the case main body 100 '. This not only limits the size of the housing body 100', but also affects the size of the cells within the housing body 100', ultimately resulting in a reduction in the energy density of the battery. Disclosure of utility model The utility model aims to provide a battery shell, a battery and a battery pack, so as to improve the energy density of the battery, enhance the reliability of blue film coating, improve the production yield, simplify the coating process and improve the structure and mode of the blue film coating of the battery shell. To achieve the purpose, the utility model adopts the following technical scheme: The battery shell comprises a shell body and a blue film, wherein the blue film is coated on the outer side wall of the shell body, the outer side wall of the shell body is provided with a plurality of shell planes, each two shell planes are connected through a transition curved surface, one of the transition curved surfaces is defined as a corner curved surface, the head end of the blue film and the tail end of the blue film are overlapped to form an overlapped part, the overlapped part is arranged on the corner curved surface, and the overlapped part does not exceed the adjacent shell planes. As an alternative technical scheme of the battery shell, the end face of the head end of the blue film is obliquely arranged, the thickness of the head end of the blue film is increased first along the direction towards the tail end of the blue film and then is kept unchanged, and the tail end of the blue film is attached to the end face of the head end of the blue film. As an alternative technical scheme of the battery shell, the inclination angle of the end face of the head end of the blue film is theta, and the angle is 60 degrees < theta <80 degrees. As an alternative solution of the battery case, the case body is rectangular, the radius of the transition curved surface other than the corner curved surface is R1, and the radius of the corner curved surface is R2, where R1< R2. As an alternative technical scheme of the battery shell, R2 is less than or equal to 0.5W, and W is the width of the shell body. As an alternative solution of the battery case, the outer surface of the case body is provided with a roughened layer. The battery comprises a battery cell and the battery shell, wherein the thickness of the side wall of the battery shell is equal everywhere, the battery cell is arranged in the battery shell, and the inner wall surface corresponding to the curved surface of the corner is fit with the battery cell in a fit mode. As an alternative technical scheme of the battery, the battery core is a winding battery core, the winding battery core comprises a straight section and two arc sections, the two arc sections are respectively arranged at two ends of the straight section, and the inner wall surface corresponding to the curved surface of the corner is fit with one arc section in a part fitting manner. As an alternative technical scheme of the battery, the radius of the corner curved surface is R2, and R2 is half of the thickness of the winding electric core. The battery pack comprises a plurality of batteries, and all the batteries are arranged in a matrix. The utility model has the beneficial effects that: According to the battery shell, the overlapped part of the blue film is limited on the corner curved surface and does not exceed the limit of the adjacent shell plane, so that the blue film is prevented from occupying extra space on the surface of the battery, the effective volume of the battery cell arranged in the shell is ensured, the space is optimally designed, the size of the battery cell which can be accommodated in the shell is ensured to be maximized, and the energy density of the battery applying the battery shell is improved. The corner curved s