CN117977130B - Battery cell and battery pack - Google Patents

Battery cell and battery pack Download PDF

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Publication number
CN117977130B
CN117977130B CN202410372540.6A CN202410372540A CN117977130B CN 117977130 B CN117977130 B CN 117977130B CN 202410372540 A CN202410372540 A CN 202410372540A CN 117977130 B CN117977130 B CN 117977130B
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China
Prior art keywords
shell
window
length
windows
housing
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CN202410372540.6A
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Chinese (zh)
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CN117977130A (en
Inventor
孙超
李金成
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Svolt Energy Technology Co Ltd
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Svolt Energy Technology Co Ltd
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Priority to CN202410372540.6A priority Critical patent/CN117977130B/en
Publication of CN117977130A publication Critical patent/CN117977130A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
    • H01M50/124—Primary casings; Jackets or wrappings characterised by the material having a layered structure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Battery Mounting, Suspending (AREA)
  • Sealing Battery Cases Or Jackets (AREA)

Abstract

The invention relates to the technical field of batteries, and discloses a battery cell and a battery pack, wherein the battery cell comprises: a housing; an insulating film coated on the outer side of the housing; the insulating film is provided with a plurality of windows, the windows are arranged corresponding to the side surfaces of the shell, the length of the side surfaces of the shell is L, and the length of the plurality of windows occupying areas is a along the length direction of the side surfaces of the shell, so that the length of the windows occupying areas is more than or equal to 0.4 and less than or equal to 0.8. According to the invention, the insulating film is windowed, so that the bonding strength between the battery cell shell and the battery pack is improved when the battery cell is bonded, and the service life and safety of the battery pack are improved; through the control to a plurality of window occupation region length, guarantee not influence the insulating effect of electric core when improving bonding strength.

Description

Battery cell and battery pack
Technical Field
The invention relates to the technical field of batteries, in particular to a battery cell and a battery pack.
Background
The battery generally includes a battery internal structure and a battery external structure, and the battery external structure mainly includes a battery cell cover plate, a battery cell housing, and a battery cell insulating member. The insulating part on the battery cell shell can prevent the metal shell from being short-circuited with the outside, plays an insulating role, and also plays a protective role to prevent the abrasion and scraping of the battery cell shell.
However, when the battery cell and the battery pack are bonded, the connection strength between the battery cell and the battery pack is reduced due to the influence of the insulating member, and the life and safety of the battery pack are affected.
Disclosure of Invention
In view of the above, the present invention provides a battery cell and a battery pack, which solves the problem that the insulation component affects the connection strength between the battery cell and the battery pack.
In a first aspect, the present invention provides a cell comprising: a housing; an insulating film coated on the outer side of the housing; the insulating film is provided with a plurality of windows, the windows are arranged corresponding to the side surfaces of the shell, the length of the side surfaces of the shell is L, and the length of the plurality of windows occupying areas is a along the length direction of the side surfaces of the shell, so that the length of the windows occupying areas is more than or equal to 0.4 and less than or equal to 0.8.
The beneficial effects are that: the insulating film is windowed, so that the bonding strength between the battery cell shell and the battery pack is improved when the battery cells are bonded, and the service life and safety of the battery pack are improved; through the control to a plurality of window occupation region length, guarantee not influence the insulating effect of electric core when improving bonding strength.
In an alternative embodiment, a plurality of the windows are located in a middle region of the side surface of the housing along the length direction of the side surface of the housing; alternatively, the plurality of windows may be located at one side of the side surface of the case in a longitudinal direction of the side surface of the case; or, the plurality of windows are respectively positioned at two sides of the side surface of the shell, the length of the window occupying area positioned at one side of the side surface of the shell is a1 along the length direction of the side surface of the shell, the length of the window occupying area positioned at the other side of the side surface of the shell is a2, and the conditions of a=a1+a2 are satisfied; or, the windows are uniformly distributed on the side surface of the shell.
In an alternative embodiment, a plurality of the windows are positioned in the middle area of the side surface of the shell, and the length a of the window occupying area is 200mm to 1000mm; the plurality of windows are positioned on one side of the side face of the shell, the length a of the plurality of window occupying areas is 200mm to 1000mm, and the distance b from the edge of the plurality of window occupying areas to the edge of the nearest side face of the shell is 5mm to 20mm along the length direction of the side face of the shell; the plurality of windows are respectively positioned at two sides of the side surface of the shell, the length a1 of the window occupying area positioned at one side of the side surface of the shell is 50mm to 250mm, the length a2 of the window occupying area positioned at the other side of the side surface of the shell is 50mm to 250mm, the distance b1 from the edge of the window occupying area positioned at one side of the side surface of the shell to the edge of the nearest side surface of the shell is 5mm to 20mm along the length direction of the side surface of the shell, and the distance b2 from the edge of the window occupying area positioned at the other side of the side surface of the shell to the edge of the nearest side surface of the shell is 5mm to 20mm.
In an alternative embodiment, the center distance m between two adjacent windows is 10mm to 30mm.
In an alternative embodiment, the fenestration is circular, oval, or polygonal.
In an alternative embodiment, the fenestration is circular, and the fenestration radius R is 2mm to 10mm; the window is rectangular, the width of the window is 8mm to 46mm, and the length of the window is 5mm to 20mm.
The beneficial effects are that: the radius of the windowing has proper size, so that the windowing area can be increased, the bonding strength between the battery cell shell and the battery pack is improved, and the insulation effect of the battery cell can be ensured.
In an alternative embodiment, the window is circular, and the distance from the edge of the window to the edge of the side surface of the shell is n along the width direction of the side surface of the shell, so that n is greater than 1mm; the window is rectangular, and along the width direction of the side face of the shell, the distance from the edge of the window to the edge of the side face of the shell is n, so that n is more than 2mm.
In an alternative embodiment, the length Z of the housing is 200mm to 1200mm, the width X of the housing is 50mm to 200mm, and the thickness Y of the housing is 12mm to 50mm.
In an alternative embodiment, the thickness h of the insulating film is 50 μm to 200 μm.
The beneficial effects are that: through the control to the insulating film thickness to satisfy the intensity requirement of insulating film laminating casing surface.
In a second aspect, the invention further provides a battery pack, which comprises the battery cell.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of an explosion structure of a battery cell according to an embodiment of the present invention;
FIG. 2 is a schematic view of a structure in which a plurality of windows are located in the middle of a side surface of a housing according to an embodiment of the present invention;
FIG. 3 is an enlarged schematic view of a portion of FIG. 2A;
fig. 4 is a schematic diagram of the overall structure of a battery cell according to an embodiment of the present invention;
FIG. 5 is a schematic view of a structure in which a plurality of windows are located on one side of a side surface of a housing according to an embodiment of the present invention;
FIG. 6 is a schematic view of a structure in which a plurality of windows are located on both sides of a side surface of a housing according to an embodiment of the present invention;
Fig. 7 is a schematic structural view of a plurality of windows uniformly distributed on a side surface of a housing according to an embodiment of the present invention.
Reference numerals illustrate:
10. a housing; 20. an insulating film; 21. windowing; 30. a pole group; 40. a top cover; 50. and (5) a patch.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Embodiments of the present invention are described below with reference to fig. 1 to 7.
According to an embodiment of the present invention, in one aspect, there is provided a battery cell including: a housing 10 and an insulating film 20, the insulating film 20 being coated on the outside of the housing 10. The insulating film 20 is provided with a plurality of windows 21, the windows 21 are arranged corresponding to the side surface of the shell 10, the length of the side surface of the shell 10 is L, and the length of the area occupied by the windows 21 is a along the length direction of the side surface of the shell 10, so that the ratio of 0.4 to a/L to 0.8 is satisfied.
By applying the battery cell of the embodiment, the insulating film 20 is provided with the window 21, so that the bonding strength between the battery cell shell 10 and the battery pack is improved when the battery cell is bonded, and the service life and the safety of the battery pack are improved; by controlling the length of the area occupied by the plurality of windows 21, the insulation effect of the battery cell is not affected while the bonding strength is improved.
The plurality of windows 21 occupy a portion of the area including between two adjacent windows 21.
In this embodiment, the battery cells are bonded by using a structural adhesive.
It should be noted that, the insulating film 20 is mostly a smooth surface, and the smooth surface makes the adhesion between the structural adhesive and the insulating film 20 lower, which further results in a decrease in the adhesive strength of the adjacent cells. Therefore, by providing the window 21, the case 10 is brought into direct contact with the structural adhesive at the position of the window 21, thereby increasing the adhesive strength.
Specifically, the battery cell in this embodiment is a blade battery cell.
Of course, in other alternative embodiments, the battery cell may be a square-case battery cell, and the window is disposed at the bottom or other side surfaces of the square-case battery cell.
It should be noted that, by providing a plurality of windows 21, the adhesive strength between the battery cell casing 10 and the battery pack is further improved while the insulating effect of the battery cell is satisfied.
In one embodiment, as shown in fig. 2, a plurality of windows 21 are located at a middle region of the side surface of the case 10 in the length direction of the side surface of the case 10; alternatively, the plurality of windows 21 are located on one side of the side surface of the housing 10 along the longitudinal direction of the side surface of the housing 10; alternatively, the plurality of windows 21 are respectively located at two sides of the side surface of the 10 casing, the length of the window 21 occupying area at one side of the side surface of the casing 10 is a1, the length of the window 21 occupying area at the other side of the side surface of the casing 10 is a2, and a=a1+a2 is satisfied; alternatively, the plurality of windows 21 are uniformly distributed on the side surface of the housing 10.
In the present embodiment, as shown in fig. 2, a plurality of fenestrations 21 are located in the middle region of the side face of the housing 10.
It should be noted that, the position of applying the structural adhesive is generally in the middle of the battery cell, and the amount of adhesive applied to the two ends of the battery cell is smaller, so that the plurality of windows 21 are disposed in the middle area of the side surface of the housing 10, which is more beneficial to improving the bonding strength between the battery cell housing 10 and the battery pack.
Of course, referring to fig. 5, in another embodiment, the plurality of windows 21 are located on one side of the side surface of the housing 10.
Of course, referring to fig. 6, in still another embodiment, the plurality of windows 21 are respectively located at two sides of the side surface of the housing 10, along the length direction of the side surface of the housing 10, the length of the occupied area of the window 21 located at one side of the side surface of the housing 10 is a1, the length of the occupied area of the window 21 located at the other side of the side surface of the housing 10 is a2, and a=a1+a2 is satisfied.
Of course, referring to fig. 7, in other alternative embodiments, the plurality of windows 21 are uniformly distributed on the side surface of the housing 10.
In one embodiment, as shown in fig. 2, a plurality of windows 21 are located at a middle region of a side surface of the case 10, and a length a of the region occupied by the plurality of windows 21 is 200mm to 1000mm.
Specifically, in the present embodiment, the length a of the area occupied by the plurality of windows 21 is 250mm, and the distance from the edge of the area occupied by the plurality of windows 21 to the edge of the side of the housing 10 is 125mm along the length direction of the side of the housing 10.
The plurality of windows 21 occupy the distance from the edge of the area to the edge of the side surface of the housing 10, that is, the length of the area where the windows 21 are not opened, along the longitudinal direction of the side surface of the housing 10.
Of course, referring to fig. 5, in another embodiment, the plurality of windows 21 are located at one side of the housing 10, the length a of the area occupied by the plurality of windows 21 is 200mm to 1000mm, and the distance b from the edge of the area occupied by the plurality of windows 21 to the edge of the nearest side of the housing 10 is 5mm to 20mm along the length direction of the side of the housing 10.
Of course, referring to fig. 6, in still another embodiment, the plurality of windows 21 are respectively located at both sides of the side of the housing 10, the length a1 of the window 21 occupying area located at one side of the housing 10 is 50mm to 250mm, the length a2 of the window 21 occupying area located at the other side of the housing 10 is 50mm to 250mm, the distance b1 from the edge of the window 21 occupying area located at one side of the housing 10 to the edge of the side of the nearest housing 10 is 5mm to 20mm along the length direction of the side of the housing 10, and the distance b2 from the edge of the window 21 occupying area located at the other side of the housing 10 to the edge of the side of the nearest housing 10 is 5mm to 20mm.
In one embodiment, as shown in fig. 3, the center-to-center distance m of two adjacent fenestrations 21 is 10mm to 30mm.
Specifically, in the present embodiment, the center distance m of two adjacent fenestrations 21 is 20mm.
It should be noted that, if the value of m is too small, that is, the distance between two adjacent windows 21 is too short, the residual insulating film 20 between two adjacent windows 21 is too small, so that the connection strength between the insulating film 20 and the housing 10 is not easy to be ensured; if the value of m is too large, that is, the distance between two adjacent windows 21 is too long, the adhesion strength of the battery cells to each other or to other components cannot be ensured.
In one embodiment, as shown in fig. 1 and 2, window 21 is circular and window 21 radius R is 2mm to 10mm.
Specifically, in the present embodiment, the radius R of the window 21 is 4mm.
Of course, in another embodiment, window 21 is rectangular, window 21 has a width of 8mm to 46mm, and window 21 has a length of 5mm to 20mm.
Of course, in other alternative embodiments, the fenestration 21 may have other shapes, such as other polygons, ovals, etc.
It should be noted that, when the area of the window 21 is too large, the adhesive strength between the battery cell and the battery pack is improved, but at this time, the insulating performance of the insulating film 20 is not acceptable due to the too large area of the window 21; when the area of the window 21 is too small, the adhesive strength between the battery cell and the battery pack is not sufficiently improved although the insulating performance of the insulating film 20 is still within the range. Therefore, the radius of the window 21 is provided with a proper size, so that the area of the window 21 can be increased, the bonding strength between the battery cell and the battery pack is improved, and the insulation effect of the battery cell can be ensured.
In one embodiment, as shown in fig. 3, the window 21 is circular, and the distance from the edge of the window 21 to the edge of the side of the housing 10 is n along the width direction of the side of the housing 10, satisfying n being greater than 1mm.
Specifically, in the present embodiment, the distance n from the edge of the window 21 to the edge of the side face of the housing 10 is 3.5mm.
In the width direction of the side surface of the case 10, the plurality of windows 21 are located at intermediate positions of the side surface of the case 10, that is, the distance from the upper edge of the window 21 to the upper edge of the side surface of the case 10 is equal to the distance from the lower edge of the window 21 to the lower edge of the side surface of the case 10.
Of course, in another embodiment, the window 21 is rectangular, and the distance from the edge of the window 21 to the edge of the side of the housing 10 is n along the width direction of the side of the housing 10, so that n is greater than 2mm.
It should be noted that, if the value of n is too small, that is, the distance from the edge of the window 21 to the edge of the side of the housing 10 is too short, the residual insulating film 20 between the edge of the window 21 and the edge of the side of the housing 10 is too small, so that the connection strength between the insulating film 20 and the housing 10 is not easy to be ensured; if the value of n is too large, that is, the distance from the edge of the window 21 to the edge of the side face of the housing 10 is too long, the adhesion strength of the battery cells to each other or to other components cannot be ensured.
In one embodiment, as shown in FIG. 4, the length Z of the housing 10 is 200mm to 1200mm, the width X of the housing 10 is 50mm to 200mm, and the thickness Y of the housing 10 is 12mm to 50mm.
Specifically, in the present embodiment, the length Z of the housing 10 is 500mm, the width X of the housing 10 is 120mm, and the thickness Y of the housing 10 is 15mm.
In this embodiment, the facets of the cells (i.e., the Y-Z faces in fig. 4) are bonded to other cells by the structural adhesive, and the window 21 is opened corresponding to the facets of the cells.
It should be further noted that the window 21 may be formed on other side surfaces (for example, the X-Z surface in fig. 4) to further improve the adhesion strength between the battery cell and the battery pack.
In the present embodiment, the length L of the side surface of the housing 10 is equal to the length Z of the housing 10, that is, the length L of the side surface of the housing 10 is also 500mm.
In the present embodiment, the thickness y=2×r+2×n of the case 10.
In one embodiment, the thickness h of the insulating film 20 is 50 μm to 200 μm.
Specifically, in the present embodiment, the thickness h of the insulating film 20 is 110 μm.
It should be noted that, the thickness of the insulating film 20 is controlled so as to meet the strength requirement of the insulating film 20 attached to the surface of the housing 10.
In one embodiment, as shown in fig. 1, the battery cell further includes a pole group 30, a top cover 40 and a patch 50, the top cover 40 is provided with two top covers 40, the two top covers 40 are respectively disposed on two sides of the housing 10 and enclose with the housing 10 to form a containing cavity, the pole group 30 is disposed in the containing cavity, and the patch 50 is disposed on a surface of the top cover 40 to play an insulating role.
The shear adhesion strength test was performed on the cells of different window 21 sizes, and the specific test results are shown in tables 1 to 4.
Table 1 shear bond strength test results one.
The cells of each comparative example and example in table 1 were uniform in size and were each length, width, and thickness=580 mm, 120mm, and 16mm.
In table 1, the plurality of windows 21 of the battery cells of each of the comparative examples and examples are located on one side of the side surface of the case 10.
As can be seen from the test results in Table 1, when a/L is less than 0.4, the bonding strength between the battery cell and the battery pack is less than 8Mpa, and the requirements are not met; when a/L is more than or equal to 0.4, the bonding strength between the battery cell and the battery pack is more than 8Mpa, and the requirement is met.
Table 2 shear adhesion strength test results two.
The cells of each comparative example and example in table 2 were uniform in size and were each length, width, and thickness=460 mm, 100mm, and 15mm.
In table 2, the plurality of windows 21 of the battery cells of each comparative example and example are located on both sides of the side surface of the case 10.
As can be seen from the test results in Table 2, when a/L is less than 0.4, the bonding strength between the battery cell and the battery pack is less than 8Mpa, and the requirements are not met; when a/L is more than or equal to 0.4, the bonding strength between the battery cell and the battery pack is more than 8Mpa, and the requirement is met.
Table 3 shear bond strength test results three.
The cells of each comparative example and example in table 3 were uniform in size and were each length×width×thickness=250 mm×50mm×14mm.
In table 3, the plurality of windows 21 of the battery cells of each comparative example and example are located on both sides of the side surface of the case 10.
As can be seen from the test results in Table 3, when a/L is less than 0.4, the bonding strength between the battery cell and the battery pack is less than 8Mpa, and the requirements are not met; when a/L is more than or equal to 0.4, the bonding strength between the battery cell and the battery pack is more than 8Mpa, and the requirement is met.
Table 4 shear bond strength test results four.
The cells of each comparative example and example in table 4 were uniform in size and were each length, width, and thickness=1200 mm, 200mm, and 50mm.
In table 4, the plurality of windows 21 of the battery cells of each of the comparative examples and examples are located in the middle region of the side surface of the case 10.
As can be seen from the test results in Table 4, when a/L is less than 0.4, the bonding strength between the battery cell and the battery pack is less than 8Mpa, and the requirements are not met; when a/L is more than or equal to 0.4, the bonding strength between the battery cell and the battery pack is more than 8Mpa, and the requirement is met.
The following test was conducted on the cells having different insulating films 20, specifically, the insulating film 20 was tested for the magnitude of the leakage current i of the insulating film 20 by pressing 2500N to 3000N against the surface of the insulating film 20 using a metal plate with conductive silica gel held on the surface of the cell and maintaining the surface for 2s under the energization of high-voltage 2000V alternating current, and the leakage current i of the insulating film 20 should not exceed 30mA. The specific test results are shown in tables 5 to 8.
Table 5 insulation withstand voltage test results one.
The cells of each comparative example and example in table 5 were uniform in size and were each length, width, and thickness=580 mm, 120mm, and 16mm.
In table 5, the plurality of windows 21 of the battery cells of each of the comparative examples and examples are located on one side of the side surface of the case 10.
As can be seen from the test results of Table 5, when a/L is less than or equal to 0.8, the leakage current i of the insulating film 20 is less than 30mA, and the insulating withstand voltage performance of the insulating film 20 meets the requirements; when a/L > 0.8, the leakage current i of the insulating film 20 is greater than 30mA, and the insulating withstand voltage performance of the insulating film 20 does not meet the requirements.
Table 6 insulation withstand voltage test results two.
The cells of each comparative example and example in table 6 were uniform in size and were each length, width, and thickness=460 mm, 100mm, and 15mm.
In table 6, the plurality of windows 21 of the battery cells of each comparative example and example are located on both sides of the side surface of the case 10.
As can be seen from the test results of Table 6, when a/L is less than or equal to 0.8, the leakage current i of the insulating film 20 is less than 30mA, and the insulating withstand voltage performance of the insulating film 20 meets the requirements; when a/L > 0.8, the leakage current i of the insulating film 20 is greater than 30mA, and the insulating withstand voltage performance of the insulating film 20 does not meet the requirements.
Table 7 insulation withstand voltage test results three.
The cells of each comparative example and example in table 7 were uniform in size and were each length, width, and thickness=250 mm, 50mm, and 14mm.
In table 7, the plurality of windows 21 of the battery cells of each comparative example and example are located on both sides of the side surface of the case 10.
As can be seen from the test results of Table 7, when a/L is less than or equal to 0.8, the leakage current i of the insulating film 20 is less than 30mA, and the insulating withstand voltage performance of the insulating film 20 meets the requirements; when a/L > 0.8, the leakage current i of the insulating film 20 is greater than 30mA, and the insulating withstand voltage performance of the insulating film 20 does not meet the requirements.
Table 8 insulation withstand voltage test results four.
The cells of each comparative example and example in table 8 were uniform in size and were each length, width, and thickness=1200 mm, 200mm, and 50mm.
In table 8, the plurality of windows 21 of the battery cells of each of the comparative examples and examples are located in the middle region of the side surface of the case 10.
As can be seen from the test results of Table 8, when a/L is less than or equal to 0.8, the leakage current i of the insulating film 20 is less than 30mA, and the insulating withstand voltage performance of the insulating film 20 meets the requirements; when a/L > 0.8, the leakage current i of the insulating film 20 is greater than 30mA, and the insulating withstand voltage performance of the insulating film 20 does not meet the requirements.
It should be noted that, in combination with the test results of tables 1 to 8, the insulating film 20 is provided with the window 21, and when a/L is not less than 0.4 and not more than 0.8, the adhesive strength between the battery cell and the battery pack can be improved without affecting the insulating effect of the insulating film 20.
According to another aspect of the embodiment of the invention, a battery pack is further provided, which comprises the battery cell.
Although embodiments of the present invention have been described in connection with the accompanying drawings, various modifications and variations may be made by those skilled in the art without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope of the invention as defined by the appended claims.

Claims (6)

1. A cell, comprising:
A housing;
An insulating film coated on the outer side of the housing; the insulating film is provided with a plurality of windows, the windows are arranged corresponding to the side surfaces of the shell, the length of the side surfaces of the shell is L, and the length of the plurality of windows occupying areas is a along the length direction of the side surfaces of the shell, so that the condition that a/L is more than or equal to 0.4 and less than or equal to 0.8 is satisfied;
The window is round, oval or polygonal;
When the window is circular, the radius R of the window is 2mm to 10mm; when the window is rectangular, the width of the window is 8mm to 46mm, and the length of the window is 5mm to 20mm;
When the window is circular, the distance from the edge of the window to the edge of the side surface of the shell is n along the width direction of the side surface of the shell, and n is more than 1mm; when the window is rectangular, the distance from the edge of the window to the edge of the side surface of the shell is n along the width direction of the side surface of the shell, and n is more than 2mm;
the length Z of the shell is 200-1200 mm, the width X of the shell is 50-200 mm, and the thickness Y of the shell is 12-50 mm.
2. The cell of claim 1, wherein a plurality of the fenestrations are located in a middle region of the side of the housing along a length of the side of the housing; or alternatively, the method can be used for processing,
The plurality of windows are positioned on one side of the side surface of the shell along the length direction of the side surface of the shell; or alternatively, the method can be used for processing,
The plurality of windowed windows are respectively positioned at two sides of the side surface of the shell, the length of the windowed window positioned at one side of the side surface of the shell in the occupying area is a1, the length of the windowed window positioned at the other side of the side surface of the shell in the occupying area is a2, and the requirements of a=a1+a2 are met; or alternatively, the method can be used for processing,
The windows are uniformly distributed on the side face of the shell.
3. The cell of claim 2, wherein a plurality of the fenestrations are located in a middle region of a side of the housing, and a length a of a plurality of the fenestrations occupying regions is 200mm to 1000mm;
The plurality of windows are positioned on one side of the side face of the shell, the length a of the plurality of window occupying areas is 200mm to 1000mm, and the distance b from the edge of the plurality of window occupying areas to the edge of the nearest side face of the shell is 5mm to 20mm along the length direction of the side face of the shell;
the plurality of windows are respectively positioned at two sides of the side surface of the shell, the length a1 of the window occupying area positioned at one side of the side surface of the shell is 50mm to 250mm, the length a2 of the window occupying area positioned at the other side of the side surface of the shell is 50mm to 250mm, the distance b1 from the edge of the window occupying area positioned at one side of the side surface of the shell to the edge of the nearest side surface of the shell is 5mm to 20mm along the length direction of the side surface of the shell, and the distance b2 from the edge of the window occupying area positioned at the other side of the side surface of the shell to the edge of the nearest side surface of the shell is 5mm to 20mm.
4. A cell according to any of claims 1-3, wherein the centre-to-centre distance m between two adjacent fenestrations is 10mm to 30mm.
5. A cell according to any of claims 1-3, wherein the insulating film has a thickness h of 50 μm to 200 μm.
6. A battery pack comprising the cell of any one of claims 1 to 5.
CN202410372540.6A 2024-03-29 2024-03-29 Battery cell and battery pack Active CN117977130B (en)

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