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CN118156697B - Battery and battery pack - Google Patents

Battery and battery pack Download PDF

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Publication number
CN118156697B
CN118156697B CN202410573778.5A CN202410573778A CN118156697B CN 118156697 B CN118156697 B CN 118156697B CN 202410573778 A CN202410573778 A CN 202410573778A CN 118156697 B CN118156697 B CN 118156697B
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CN
China
Prior art keywords
battery
shell
requirement
explosion
cover plate
Prior art date
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Active
Application number
CN202410573778.5A
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Chinese (zh)
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CN118156697A (en
Inventor
李金成
周杰
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Svolt Energy Technology Co Ltd
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Svolt Energy Technology Co Ltd
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Priority to CN202410573778.5A priority Critical patent/CN118156697B/en
Publication of CN118156697A publication Critical patent/CN118156697A/en
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Publication of CN118156697B publication Critical patent/CN118156697B/en
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Classifications

    • 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
    • H01M50/147—Lids or covers
    • H01M50/148—Lids or covers characterised by their shape
    • H01M50/152—Lids or covers characterised by their shape for cells having curved cross-section, e.g. round or elliptic
    • 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
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/107—Primary casings; Jackets or wrappings characterised by their shape or physical structure having curved cross-section, e.g. round or elliptic
    • 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
    • H01M50/131—Primary casings; Jackets or wrappings characterised by physical properties, e.g. gas permeability, size or heat resistance
    • 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
    • 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
    • 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)
  • Gas Exhaust Devices For Batteries (AREA)
  • Sealing Battery Cases Or Jackets (AREA)

Abstract

The invention relates to the technical field of batteries, and discloses a battery and a battery pack, wherein the battery comprises: the shell is of a hollow structure with an opening; the cover plate is arranged corresponding to the opening, the cover plate is welded with the shell to form a welding line at the joint of the cover plate and the shell, and the cover plate and the shell are enclosed to form an accommodating space; the pole group is arranged in the accommodating space; the diameter of the outer wall of the shell is k, the tensile strength of the shell is e, the penetration of the welding seam is a along the radial direction of the shell, the upper limit value of the opening pressure of the explosion-proof valve of the battery is p, and the conditions that 2.8xexax (k-a)/k-0.1 is more than or equal to p are met. The invention limits the relation between the penetration of the welding seam and the diameter of the outer wall of the shell, the tensile strength of the shell and the opening pressure of the explosion-proof valve, so that the penetration of the welding seam has proper value, the welding strength of the shell and the cover plate is ensured, the air tightness of the battery is ensured, and the battery can safely run.

Description

Battery and battery pack
Technical Field
The invention relates to the technical field of batteries, in particular to a battery and a battery pack.
Background
The power battery generally comprises a battery internal structure and a battery external structure, wherein the battery internal structure mainly comprises a battery cell pole group, the battery external structure mainly comprises a battery cell cover plate and a battery cell shell, the battery cell shell provides a containing space for the battery cell pole group, and the battery cell cover plate and the battery cell shell form a closed space through welding and matching, so that a complete battery structure is formed. If welding between the battery cell cover plate and the battery cell shell is not firm enough, cracking and breakage easily occur, and especially when the battery generates gas in the charging and discharging process, internal air pressure can form shearing force at a welding gap, and the welding seam is easy to crack, so that the air tightness of the battery is poor and then the leakage condition of the battery occurs, the battery is invalid, and safety accidents occur.
Disclosure of Invention
In view of the above, the invention provides a battery and a battery pack, which are used for solving the problems of poor air tightness, easy failure of the battery and safety accidents caused by the fact that the welding seam is easy to crack due to low welding strength of a battery core cover plate and a battery core shell in the prior art.
In a first aspect, the present invention provides a battery comprising: the shell is of a hollow structure with an opening; the cover plate is arranged corresponding to the opening, the cover plate is welded with the shell to form a welding line at the joint of the cover plate and the shell, and the cover plate and the shell are enclosed to form an accommodating space; the pole group is arranged in the accommodating space; the diameter of the outer wall of the shell is k, the tensile strength of the shell is e, the penetration of the welding seam is a along the radial direction of the shell, the upper limit value of the opening pressure of the explosion-proof valve of the battery is p, the opening pressure of the explosion-proof valve is 2.8xxax (k-a)/k is 0.1-p, the value range of the penetration a is 100 mu m-a-1000 mu m, the value range of the diameter k of the outer wall of the shell is 10 mm-k-100 mm, the value range of the tensile strength e of the shell is 30 MPa-e 2500MPa, and the value range of the opening pressure upper limit value p of the explosion-proof valve is 0.6 MPa-p-2.6 MPa.
The beneficial effects are that: the method has the advantages that the relation between the penetration of the welding seam and the outer wall diameter of the shell, the tensile strength of the shell and the opening pressure of the explosion-proof valve is limited, so that the penetration of the welding seam has proper value, the welding strength of the shell and the cover plate is ensured, the welding seam cracking is avoided, the air tightness of the battery is ensured, the leakage of the battery is avoided, the reliability of the battery is ensured, and the battery can safely run.
In an alternative embodiment, the weld bead has a width b in the axial direction of the housing, satisfying 100 μm.ltoreq.b.ltoreq.3000 μm.
The beneficial effects are that: the welding reliability is ensured, the welding bead phenomenon is avoided, and the welding yield is ensured.
In an alternative embodiment, the cover plate is formed with a connection boss, the connection boss is in abutting connection with the end face of the shell, where the end face of the opening is formed by the shell, and the thickness of the connection boss is t1, so that the thickness of the connection boss is 0.1mm less than or equal to t 1mm less than or equal to 3mm.
The beneficial effects are that: the cover plate structure strength and the welding strength are ensured, and meanwhile, the influence on the energy density of the battery caused by overlarge thickness of the cover plate is avoided.
In an alternative embodiment, the wall thickness of the housing is t2, satisfying 0.1 mm.ltoreq.t2.ltoreq.1 mm.
The beneficial effects are that: the structure strength and the welding strength of the shell are ensured, and meanwhile, the influence of the overlarge wall thickness of the shell on the energy density of the battery is avoided.
In an alternative embodiment, the penetration a and the thickness t1 of the connecting boss satisfy t1.gtoreq.a.
The beneficial effects are that: preventing the welding seam from penetrating the cover plate to burn the electrode group.
In an alternative embodiment, the penetration a and the wall thickness t2 of the housing satisfy t2.gtoreq.a.
The beneficial effects are that: preventing the weld from penetrating the housing and burning the pole group.
In an alternative embodiment, the welding seam forms a first protruding part on the outer peripheral surfaces of the shell and the cover plate, and the height of the first protruding part is c1 along the radial direction of the shell, so that the height of c1 is less than or equal to 100 mu m.
The beneficial effects are that: when the insulation protection sheet is attached to the outer Zhou Tie of the battery, the insulation protection sheet is prevented from tilting, and the flatness of the surface of the battery is ensured.
In an alternative embodiment, the weld joint forms a second protruding part on one surface of the cover plate far away from the shell, and the height of the second protruding part is c2 along the axial direction of the shell, so that c2 is less than or equal to 250 mu m.
The beneficial effects are that: when the insulating protection sheet is attached to the outer surface of the cover plate, the insulating protection sheet is prevented from tilting, and the flatness of the surface of the battery is ensured.
In a second aspect, the invention also provides a battery pack comprising the battery.
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 cross-sectional view of a battery according to an embodiment of the present invention in an axial direction;
fig. 2 is a partial schematic structure of the battery shown in fig. 1;
FIG. 3 is a top view of a cover plate according to an embodiment of the present invention;
FIG. 4 is a cross-sectional view taken along the direction A-A in FIG. 3;
FIG. 5 is an enlarged schematic view of part of B in FIG. 1;
fig. 6 is a schematic structural view of a first protrusion and a second protrusion according to an embodiment of the present invention.
Reference numerals illustrate:
1. A housing; 2. a cover plate; 21. a connecting boss; 22. convex hulls; 3. welding seams; 31. a first projection; 32. a second projection; 4. a pole group.
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 6.
According to an embodiment of the present invention, in one aspect, there is provided a battery including: a housing 1, a cover plate 2 and a pole group 4. The casing 1 is for having open-ended hollow structure, and apron 2 corresponds the opening setting, and apron 2 and casing 1 weld in order to form welding seam 3 in the junction of apron 2 and casing 1, and apron 2 and casing 1 enclose and close and form accommodation space, and utmost point group 4 sets up in accommodation space. The diameter of the outer wall of the shell 1 is k, the tensile strength of the shell 1 is e, the penetration of the welding seam 3 is a along the radial direction of the shell 1, the upper limit value of the opening pressure of the explosion-proof valve of the battery is p, the opening pressure of the explosion-proof valve is 2.8xxax (k-a)/k is more than or equal to 0.1 and equal to p, the range of the penetration a is more than or equal to 100 mu m and less than or equal to 1000 mu m, the range of the diameter k of the outer wall of the shell is more than or equal to 10mm and less than or equal to 100mm, the range of the tensile strength e of the shell is more than or equal to 30MPa and less than or equal to e and less than or equal to 2500MPa, and the range of the upper limit value p of the opening pressure of the explosion-proof valve is more than or equal to 0.6MPa and less than or equal to p and less than or equal to 2.6MPa.
The relation between the penetration of the welding seam 3 and the outer wall diameter of the shell 1, the tensile strength of the shell 1 and the opening pressure of the explosion-proof valve is limited, so that the penetration of the welding seam 3 has proper value, the welding strength of the shell 1 and the cover plate 2 is ensured, the welding seam 3 is prevented from cracking, the air tightness of the battery is ensured, the leakage of the battery is avoided, the reliability of the battery is ensured, and the battery can safely run.
In the formula 2.8XeXaXX (k-a)/k0.1. Gtoreq.p, the outer wall diameter k of the casing 1 is in mm, the tensile strength e of the casing 1 is in MPa, the penetration a of the weld joint 3 is in mm, and the opening pressure upper limit p of the explosion-proof valve is in MPa.
The upper limit p of the opening pressure of the explosion-proof valve is generally 0.6MPa, 1.1MPa, 1.4MPa, 1.7MPa, 2.2MPa, 2.6MPa, or the like, and any value between the above values.
It should be noted that, in this embodiment, the battery is a cylindrical battery.
As shown in FIG. 5, the penetration a is 100 μm.ltoreq.a.ltoreq.1000. Mu.m. The required wall thickness of the shell 1 is prevented from being excessively large to influence the energy density of the battery while the welding reliability is ensured.
It should be noted that if a is smaller than 100 μm, the penetration of the weld 3 is too small, the welding strength between the casing 1 and the cover plate 2 is insufficient, the welding tightness is poor, and the risk of battery leakage exists; if a > 1000 μm, the penetration of the weld 3 is too large, and therefore, a case 1 having a large wall thickness is required, resulting in a decrease in the energy density of the battery.
In one embodiment, as shown in FIG. 5, the weld 3 has a width b in the axial direction of the housing 1, satisfying 100 μm.ltoreq.b.ltoreq.3000 μm. The welding reliability is ensured, the welding bead phenomenon is avoided, and the welding yield is ensured.
It should be noted that if b is smaller than 100 μm, the welding width of the welding seam 3 is too small, the welding strength of the shell 1 and the cover plate 2 is insufficient, the welding tightness is poor, and the risk of battery leakage exists; if b is more than 3000 mu m, the melting width of the welding seam 3 exceeds the thickness of the cover plate 2 (namely the connecting boss 21) at the joint of the cover plate 2 and the shell 1, the welding bead phenomenon is easy to occur, the welding yield is reduced, and the production cost is increased.
Alternatively, the melting width b may take a value of 100 μm, 300 μm, 500 μm, 800 μm, 1200 μm, 1500 μm, 2000 μm, 2300 μm, 2700 μm, 3000 μm, or the like, and any value therebetween.
In one embodiment, as shown in fig. 4 to 6, the cover plate 2 is formed with a connection boss 21, the connection boss 21 is disposed in abutment with an end face of the housing 1 forming an opening, and the thickness of the connection boss 21 is t1, satisfying 0.1 mm.ltoreq.t1.ltoreq.3mm. The structure strength and the welding strength of the cover plate 2 are ensured, and meanwhile, the influence on the energy density of the battery caused by the overlarge thickness of the cover plate 2 is avoided.
It should be noted that, if t1 is less than 0.1mm, the connecting boss 21 is too thin, the structural strength of the cover plate 2 is low, and the connecting boss 21 and the shell 1 are not easy to be welded, so that the welding strength is not easy to be ensured; if t1 > 3mm, the connection boss 21 is excessively thick, resulting in a decrease in the energy density of the battery.
Alternatively, the thickness t1 of the connection boss 21 may take a value of 0.1mm, 0.3mm, 0.6mm, 1mm, 1.5mm, 1.8mm, 2mm, 2.3mm, 2.7mm, 3mm, or the like, and any value therebetween.
In one embodiment, as shown in FIG. 2, the wall thickness of the housing 1 is t2, satisfying 0.1 mm.ltoreq.t2.ltoreq.1 mm. The structural strength and the welding strength of the shell 1 are ensured, and the influence on the energy density of the battery caused by the overlarge wall thickness of the shell 1 is avoided.
It is worth to say that if t2 is less than 0.1mm, the shell 1 is too thin, the structural strength of the shell 1 is low, the shell 1 and the cover plate 2 are not easy to weld, and the welding strength is not easy to ensure; if t2 > 1mm, the case 1 is excessively thick, resulting in a decrease in the energy density of the battery.
Alternatively, the wall thickness t2 of the housing 1 may take on values of 0.1mm, 0.2mm, 0.3mm, 0.5mm, 0.6mm, 0.8mm, 1mm, etc. and any value therebetween.
In one embodiment, the penetration a and the thickness t1 of the connecting boss 21 satisfy t 1. Gtoreq.a. Thereby preventing the weld from penetrating the cover plate and burning the pole group.
Alternatively, t1=0.2 mm a=0.1 mm, t1=1.5 mm a=0.6 mm, t1=3 mm a=1 mm, and so on.
In one embodiment, the penetration a and the wall thickness t2 of the housing 1 satisfy t 2. Gtoreq.a. Thereby preventing the weld from penetrating the housing to burn the pole group.
Alternatively, a=0.1 mm when t2=0.15 mm, a=0.6 mm when t2=0.8 mm, a=1 mm when t2=1 mm, and the like.
In one embodiment, as shown in FIG. 6, the weld 3 forms a first protrusion 31 on the outer peripheral surfaces of the case 1 and the cover plate 2, and the height of the first protrusion 31 is c1 along the radial direction of the case 1, satisfying that c 1. Ltoreq.100. Mu.m. When the insulation protection sheet is attached to the outer Zhou Tie of the battery, the insulation protection sheet is prevented from tilting, and the flatness of the surface of the battery is ensured.
Alternatively, the height c1 of the first projection 31 may take any value of 0 μm, 5 μm, 10 μm, 20 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, etc. and between the above values.
In one embodiment, as shown in FIG. 6, the weld 3 forms a second protrusion 32 on the side of the cover plate 2 away from the housing 1, and the height of the second protrusion 32 is c2 along the axial direction of the housing 1, so that c2 is less than or equal to 250 μm. When the insulating protection sheet is attached to the outer surface of the cover plate 2, the insulating protection sheet is prevented from tilting, and the flatness of the surface of the battery is ensured.
Alternatively, the height c2 of the second protrusion 32 may take a value of 0 μm, 5 μm, 10 μm, 20 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, 120 μm, 150 μm, 200 μm, 250 μm, or the like, and any value therebetween.
It should be noted that, due to the high temperature of the welding, the metallographic structure inside the cover plate 2 is affected, so that the first protrusion 31 and the second protrusion 32 are formed on the outer surfaces of the cover plate 2 and the housing 1.
In one embodiment, as shown in fig. 4, the inner surface of the cover plate 2 is formed with a convex hull 22, the convex hull 22 being disposed adjacent to the connection boss 21, the convex hull 22 being inserted into the inside of the housing 1 through the opening. By arranging the convex hull 22, the cover plate 2 plays a role in positioning and guiding when being assembled with the shell 1, and is convenient to assemble.
The weld 3 strength and the air tightness of the different cells were tested below, and the test results of the examples and comparative examples in which k=46 mm are shown in table 1. Wherein, the examples refer to the batteries satisfying the formula 2.8XeXaXX (k-a)/kN-0.1. Gtoreq.p as presented in the present examples, and the comparative examples are the batteries not satisfying the formula 2.8XeXaX (k-a)/kN-0.1. Gtoreq.p as presented in the present examples.
Table 1 test results of examples and comparative examples
As can be seen from table 1, in example 1, k=46, e=50, a=0.325, and thus, 2.8×e×a× (k-a)/k-0.1=0.88; further, p=0.7 and 0.88 > 0.7, and thus, satisfies the requirement that the formula 2.8xexax (k-a)/kj < 0.1 > p. Through tests, the strength of the battery weld joint 3 meets the requirement, no air leakage exists under 0.7MPa, and the explosion-proof valve can be normally opened.
As can be seen from table 1, in example 2, k=46, e=50, a=0.289, and thus, 2.8×e×a× (k-a)/k-0.1=0.77; further, p=0.7 and 0.77 > 0.7, and thus, satisfies the requirement that the formula 2.8xexax (k-a)/kj-0.1. Gtoreq.p. Through tests, the strength of the battery weld joint 3 meets the requirement, no air leakage exists under 0.7MPa, and the explosion-proof valve can be normally opened.
As can be seen from table 1, in example 3, k=46, e=50.654, a=0.281, and thus, 2.8×e×a× (k-a)/k-0.1=0.76; further, p=0.7 and 0.76 > 0.7, and thus, satisfies the requirement that the formula 2.8xexax (k-a)/kj-0.1. Gtoreq.p. Through tests, the strength of the battery weld joint 3 meets the requirement, no air leakage exists under 0.7MPa, and the explosion-proof valve can be normally opened.
As can be seen from table 1, in example 4, k=46, e=80, a=0.3, and thus, 2.8×e×a× (k-a)/k-0.1=1.35; further, p=0.9 and 1.35 > 0.9, and thus, satisfies the requirement that the formula 2.8xexax (k-a)/kj-0.1. Gtoreq.p. Through tests, the strength of the battery weld joint 3 meets the requirement, no air leakage exists under 0.9MPa, and the explosion-proof valve can be normally opened.
As can be seen from table 1, in example 5, k=46, e=120, a=0.386, and thus, 2.8×e×a× (k-a)/k-0.1=2.70; further, p=0.9 and 2.70 > 0.9, and thus, satisfies the requirement that the formula 2.8xexax (k-a)/kj < 0.1 > p. Through tests, the strength of the battery weld joint 3 meets the requirement, no air leakage exists under 0.9MPa, and the explosion-proof valve can be normally opened.
As can be seen from table 1, in example 6, k=46, e=162, a=0.219, and thus, 2.8×e×a× (k-a)/k-0.1=2.05; further, p=1.4 and 2.05 > 1.4, and thus, satisfies the requirement that the formula 2.8xexax (k-a)/kj < 0.1 > p. Through tests, the strength of the battery weld joint 3 meets the requirement, no air leakage exists under 1.4MPa, and the explosion-proof valve can be normally opened.
As can be seen from table 1, in example 7, k=46, e=196, a=0.159, and thus, 2.8×e×a× (k-a)/k-0.1=1.79; further, p=1.4 and 1.79 > 1.4, and thus, satisfies the requirement that the formula 2.8xexax (k-a)/kj < 0.1 > p. Through tests, the strength of the battery weld joint 3 meets the requirement, no air leakage exists under 1.4MPa, and the explosion-proof valve can be normally opened.
As can be seen from table 1, in example 8, k=46, e=206, a=0.452, and thus, 2.8×e×a× (k-a)/k-0.1=5.51; further, p=2.2 and 5.51 > 2.2, and thus, satisfies the requirement that the formula 2.8xexax (k-a)/kj-0.1. Gtoreq.p. Through tests, the strength of the battery weld joint 3 meets the requirement, no air leakage exists under 2.2MPa, and the explosion-proof valve can be normally opened.
As can be seen from table 1, in example 9, k=46, e=265, a=0.325, and thus, 2.8×e×a× (k-a)/k-0.1=5.11; further, p=2.2 and 5.11 > 2.2, and thus, satisfies the requirement that the formula 2.8xexax (k-a)/kj < 0.1 > p. Through tests, the strength of the battery weld joint 3 meets the requirement, no air leakage exists under 2.2MPa, and the explosion-proof valve can be normally opened.
As can be seen from table 1, in example 10, k=46, e=100, a=0.314, and thus, 2.8×e×a× (k-a)/k-0.1=1.80; further, p=0.8 and 1.80 > 0.8, and thus, satisfies the requirement that the formula 2.8xexax (k-a)/kj < 0.1 > p. Through tests, the strength of the battery weld joint 3 meets the requirement, no air leakage exists under 0.8MPa, and the explosion-proof valve can be normally opened.
As can be seen from table 1, in comparative example 1, k=46, e=120, a=0.085, and thus, 2.8×e×a× (k-a)/k-0.1=0.52; further, p=0.6, and 0.52 < 0.6, i.e., 2.8×e×a× (k-a)/k-0.1 < p, does not satisfy the requirement that the formula 2.8×e×a× (k-a)/k, k-0.1. Gtoreq.p. Through tests, the strength of the battery weld joint 3 does not meet the requirement, and the weld joint 3 is damaged and air leaks before the explosion-proof valve is opened.
As can be seen from table 1, in comparative example 2, k=46, e=25, a=0.324, and thus, 2.8×e×a× (k-a)/k-0.1=0.39; further, p=0.7, and 0.39 < 0.7, i.e., 2.8×e×a× (k-a)/k-0.1 < p, does not satisfy the requirement that the formula 2.8×e×a× (k-a)/k, k-0.1. Gtoreq.p. Through tests, the tensile strength of the battery shell is lower, the strength of the welding line 3 does not meet the requirement, and the welding line 3 is damaged and air leaks before the explosion-proof valve is opened.
The weld 3 strength and the air tightness of the different cells were tested below, and the test results of the examples and comparative examples in which k=18 mm are shown in table 2. Wherein, the examples refer to the batteries satisfying the formula 2.8XeXaXX (k-a)/kN-0.1. Gtoreq.p as presented in the present examples, and the comparative examples are the batteries not satisfying the formula 2.8XeXaX (k-a)/kN-0.1. Gtoreq.p as presented in the present examples.
Table 2 test results of examples and comparative examples
As can be seen from table 2, in example 11, k=18, e=60, a=0.1, and thus, 2.8×e×a× (k-a)/k-0.1=0.83; further, p=0.8 and 0.83 > 0.8, and thus, the requirement that the formula 2.8xexax (k-a)/kj-0.1. Gtoreq.p is satisfied. Through tests, the strength of the battery weld joint 3 meets the requirement, no air leakage exists under 0.8MPa, and the explosion-proof valve can be normally opened.
As can be seen from table 2, in example 12, k=18, e=60, a=0.201, and thus, 2.8×e×a× (k-a)/k-0.1=1.76; further, p=0.8 and 1.76 > 0.8, and thus, satisfies the requirement that the formula 2.8xexax (k-a)/kj < 0.1 > p. Through tests, the strength of the battery weld joint 3 meets the requirement, no air leakage exists under 0.8MPa, and the explosion-proof valve can be normally opened.
As can be seen from table 2, in example 13, k=18, e=60, a=0.315, and thus, 2.8×e×a× (k-a)/k-0.1=2.79; further, p=0.8 and 2.79 > 0.8, and thus, satisfies the requirement that the formula 2.8xexax (k-a)/kj < 0.1 > p. Through tests, the strength of the battery weld joint 3 meets the requirement, no air leakage exists under 0.8MPa, and the explosion-proof valve can be normally opened.
As can be seen from table 2, in example 14, k=18, e=60, a=0.426, and thus, 2.8×e×a× (k-a)/k-0.1=3.78; further, p=0.8 and 3.78 > 0.8, and thus, satisfies the requirement that the formula 2.8xexax (k-a)/kj < 0.1 > p. Through tests, the strength of the battery weld joint 3 meets the requirement, no air leakage exists under 0.8MPa, and the explosion-proof valve can be normally opened.
As can be seen from table 2, in example 15, k=18, e=60, a=0.582, and thus, 2.8×e×a× (k-a)/k-0.1=5.16; further, p=0.8 and 5.16 > 0.8, and thus, satisfies the requirement that the formula 2.8xexax (k-a)/kj < 0.1 > p. Through tests, the strength of the battery weld joint 3 meets the requirement, no air leakage exists under 0.8MPa, and the explosion-proof valve can be normally opened.
As can be seen from table 2, in example 16, k=18, e=60, a=0.768, and thus, 2.8×e×a× (k-a)/k-0.1=6.76; further, p=0.8 and 6.76 > 0.8, and thus, satisfies the requirement that the formula 2.8xexax (k-a)/kj < 0.1 > p. Through tests, the strength of the battery weld joint 3 meets the requirement, no air leakage exists under 0.8MPa, and the explosion-proof valve can be normally opened.
As can be seen from table 2, in example 17, k=18, e=60, a=1, and thus, 2.8×e×a× (k-a)/k-0.1=8.71; further, p=0.8 and 8.71 > 0.8, and thus, satisfies the requirement that the formula 2.8xexax (k-a)/kj-0.1. Gtoreq.p. Through tests, the strength of the battery weld joint 3 meets the requirement, no air leakage exists under 0.8MPa, and the explosion-proof valve can be normally opened.
As can be seen from table 2, in example 18, k=18, e=100, a=0.312, and thus, 2.8×e×a× (k-a)/k-0.1=4.67; further, p=0.8 and 4.67 > 0.8, and thus, satisfies the requirement that the formula 2.8xexax (k-a)/kj < 0.1 > p. Through tests, the strength of the battery weld joint 3 meets the requirement, no air leakage exists under 0.8MPa, and the explosion-proof valve can be normally opened.
As can be seen from table 2, in example 19, k=18, e=250, a=0.3, and thus, 2.8×e×a× (k-a)/k-0.1=11.37; further, p=0.8 and 11.37 > 0.8, and thus, satisfies the requirement that the formula 2.8xexax (k-a)/kj-0.1. Gtoreq.p. Through tests, the strength of the battery weld joint 3 meets the requirement, no air leakage exists under 0.8MPa, and the explosion-proof valve can be normally opened.
As can be seen from table 2, in example 20, k=18, e=450, a=0.305, and thus, 2.8×e×a× (k-a)/k-0.1=20.89; further, p=0.8 and 20.89 > 0.8, and thus, satisfies the requirement that the formula 2.8xexax (k-a)/kj < 0.1 > p. Through tests, the strength of the battery weld joint 3 meets the requirement, no air leakage exists under 0.8MPa, and the explosion-proof valve can be normally opened.
As can be seen from table 2, in example 21, k=18, e=100, a=0.311, and thus, 2.8×e×a× (k-a)/k-0.1=4.65; further, p=1.4 and 4.65 > 1.4, and thus, satisfies the requirement that the formula 2.8xexax (k-a)/kj < 0.1 > p. Through tests, the strength of the battery weld joint 3 meets the requirement, no air leakage exists under 1.4MPa, and the explosion-proof valve can be normally opened.
As can be seen from table 2, in example 22, k=18, e=100, a=0.315, and thus, 2.8×e×a× (k-a)/k-0.1=4.71; further, p=2.2 and 4.71 > 2.2, and thus, satisfies the requirement that the formula 2.8xexax (k-a)/kj < 0.1 > p. Through tests, the strength of the battery weld joint 3 meets the requirement, no air leakage exists under 2.2MPa, and the explosion-proof valve can be normally opened.
As can be seen from table 2, in comparative example 3, k=18, e=60, a=0.05, and thus, 2.8×e×a× (k-a)/k-0.1=0.37; further, p=0.8, and 0.37 < 0.8, i.e., 2.8×e×a× (k-a)/k-0.1 < p, does not satisfy the requirement that the formula 2.8×e×a× (k-a)/k, k-0.1. Gtoreq.p. Through tests, the strength of the battery weld joint 3 does not meet the requirement, and the weld joint 3 is damaged and air leaks before the explosion-proof valve is opened.
As can be seen from table 2, in comparative example 4, k=18, e=25, a=0.21, and thus, 2.8×e×a× (k-a)/k-0.1=0.71; further, p=0.8, and 0.71 < 0.8, i.e., 2.8×e×a× (k-a)/k-0.1 < p, does not satisfy the requirement that the formula 2.8×e×a× (k-a)/k, k-0.1. Gtoreq.p. Through tests, the tensile strength of the battery shell is lower, the strength of the welding line 3 does not meet the requirement, and the welding line 3 is damaged and air leaks before the explosion-proof valve is opened.
The weld 3 strength and the air tightness of the different cells were tested below, and the test results of the examples and comparative examples in which k=60 mm are shown in table 3. Wherein, the examples refer to the batteries satisfying the formula 2.8XeXaXX (k-a)/kN-0.1. Gtoreq.p as presented in the present examples, and the comparative examples are the batteries not satisfying the formula 2.8XeXaX (k-a)/kN-0.1. Gtoreq.p as presented in the present examples.
Table 3 test results of examples and comparative examples
As can be seen from table 3, in example 23, k=60, e=300, a=0.1, and thus, 2.8×e×a× (k-a)/k-0.1=1.3; further, p=0.8 and 1.3 > 0.8, and thus, satisfies the requirement that the formula 2.8xexax (k-a)/kj-0.1. Gtoreq.p. Through tests, the strength of the battery weld joint 3 meets the requirement, no air leakage exists under 0.8MPa, and the explosion-proof valve can be normally opened.
As can be seen from table 3, in example 24, k=60, e=300, a=0.221, and thus, 2.8×e×a× (k-a)/k-0.1=2.98; further, p=0.8 and 2.98 > 0.8, and thus, satisfies the requirement that the formula 2.8xexax (k-a)/kj < 0.1 > p. Through tests, the strength of the battery weld joint 3 meets the requirement, no air leakage exists under 0.8MPa, and the explosion-proof valve can be normally opened.
As can be seen from table 3, in example 25, k=60, e=300, a=0.305, and thus, 2.8×e×a× (k-a)/k-0.1=4.15; further, p=0.8 and 4.15 > 0.8, and thus, satisfies the requirement that the formula 2.8xexax (k-a)/kj < 0.1 > p. Through tests, the strength of the battery weld joint 3 meets the requirement, no air leakage exists under 0.8MPa, and the explosion-proof valve can be normally opened.
As can be seen from table 3, in example 26, k=60, e=300, a=0.418, and thus, 2.8×e×a× (k-a)/k-0.1=5.71; further, p=0.8 and 5.71 > 0.8, and thus, satisfies the requirement that the formula 2.8xexax (k-a)/kj-0.1. Gtoreq.p. Through tests, the strength of the battery weld joint 3 meets the requirement, no air leakage exists under 0.8MPa, and the explosion-proof valve can be normally opened.
As can be seen from table 3, in example 27, k=60, e=300, a=0.568, and thus, 2.8×e×a× (k-a)/k-0.1=7.78; further, p=0.8 and 7.78 > 0.8, and thus, satisfies the requirement that the formula 2.8xexax (k-a)/kj < 0.1 > p. Through tests, the strength of the battery weld joint 3 meets the requirement, no air leakage exists under 0.8MPa, and the explosion-proof valve can be normally opened.
As can be seen from table 3, in example 28, k=60, e=300, a=0.771, and thus, 2.8×e×a× (k-a)/k-0.1=10.56; further, p=0.8 and 10.56 > 0.8, and thus, satisfies the requirement that the formula 2.8xexax (k-a)/kj < 0.1 > p. Through tests, the strength of the battery weld joint 3 meets the requirement, no air leakage exists under 0.8MPa, and the explosion-proof valve can be normally opened.
As can be seen from table 3, in example 29, k=60, e=300, a=1, and thus, 2.8×e×a× (k-a)/k-0.1=13.67; further, p=0.8 and 13.67 > 0.8, and thus, satisfies the requirement that the formula 2.8xexax (k-a)/kj < 0.1 > p. Through tests, the strength of the battery weld joint 3 meets the requirement, no air leakage exists under 0.8MPa, and the explosion-proof valve can be normally opened.
As can be seen from table 3, in example 30, k=60, e=100, a=0.309, and thus, 2.8×e×a× (k-a)/k-0.1=1.33; further, p=0.8 and 1.33 > 0.8, and thus, satisfies the requirement that the formula 2.8xexax (k-a)/kj-0.1. Gtoreq.p. Through tests, the strength of the battery weld joint 3 meets the requirement, no air leakage exists under 0.8MPa, and the explosion-proof valve can be normally opened.
As can be seen from table 3, in example 31, k=60, e=500, a=0.295, and thus, 2.8×e×a× (k-a)/k-0.1=6.75; further, p=1.6 and 6.75 > 1.6, and thus, satisfies the requirement that the formula 2.8xexax (k-a)/kj < 0.1 > p. Through tests, the strength of the battery weld joint 3 meets the requirement, no air leakage exists under 1.6MPa, and the explosion-proof valve can be normally opened.
As can be seen from table 3, in example 32, k=60, e=450, a=0.305, and thus, 2.8×e×a× (k-a)/k-0.1=6.27; further, p=2 and 6.27 > 2, and thus, the requirement that the formula 2.8xexax (k-a)/k-0.1. Gtoreq.p is satisfied. Through tests, the strength of the battery weld joint 3 meets the requirement, no air leakage exists under 2MPa, and the explosion-proof valve can be normally opened.
As can be seen from table 3, in example 33, k=60, e=1500, a=0.311, and thus, 2.8×e×a× (k-a)/k-0.1=21.56; further, p=2.4 and 21.56 > 2.4, and thus, satisfies the requirement that the formula 2.8xexax (k-a)/kj-0.1. Gtoreq.p. Through tests, the strength of the battery weld joint 3 meets the requirement, no air leakage exists under 2.4MPa, and the explosion-proof valve can be normally opened.
As can be seen from table 3, in comparative example 5, k=60, e=25, a=0.556, and thus, 2.8×e×a× (k-a)/k-0.1=0.54; further, p=0.6, and 0.54 < 0.6, i.e., 2.8×e×a× (k-a)/k-0.1 < p, does not satisfy the requirement that the formula 2.8×e×a× (k-a)/k, k-0.1. Gtoreq.p. Through tests, the tensile strength of the battery shell is lower, the strength of the welding line 3 does not meet the requirement, and the welding line 3 is damaged and air leaks before the explosion-proof valve is opened.
As can be seen from table 3, in comparative example 6, k=60, e=300, a=0.05, and thus, 2.8×e×a× (k-a)/k-0.1=0.60; further, p=0.8, and 0.60 < 0.8, i.e., 2.8×e×a× (k-a)/k-0.1 < p, does not satisfy the requirement that the formula 2.8×e×a× (k-a)/k, k-0.1. Gtoreq.p. Through tests, the strength of the battery weld joint 3 does not meet the requirement, and the weld joint 3 is damaged and air leaks before the explosion-proof valve is opened.
The weld 3 strength and the air tightness of the different cells were tested below, and the test results of the examples and comparative examples in which k=10 mm are shown in table 4. Wherein, the examples refer to the batteries satisfying the formula 2.8XeXaXX (k-a)/kN-0.1. Gtoreq.p as presented in the present examples, and the comparative examples are the batteries not satisfying the formula 2.8XeXaX (k-a)/kN-0.1. Gtoreq.p as presented in the present examples.
Table 4 test results of examples and comparative examples
As can be seen from table 4, in example 34, k=10, e=60, a=0.1, and thus, 2.8×e×a× (k-a)/k-0.1=1.56; further, p=0.8 and 1.56 > 0.8, and thus, satisfies the requirement that the formula 2.8xexax (k-a)/kj-0.1. Gtoreq.p. Through tests, the strength of the battery weld joint 3 meets the requirement, no air leakage exists under 0.8MPa, and the explosion-proof valve can be normally opened.
As can be seen from table 4, in example 35, k=10, e=60, a=0.268, and thus, 2.8×e×a× (k-a)/k-0.1=4.28; further, p=0.6 and 4.28 > 0.6, and thus, satisfies the requirement that the formula 2.8xexax (k-a)/kj < 0.1 > p. Through tests, the strength of the battery weld joint 3 meets the requirement, no air leakage exists under 0.6MPa, and the explosion-proof valve can be normally opened.
As can be seen from table 4, in example 36, k=10, e=60, a=0.356, and thus, 2.8×e×a× (k-a)/k-0.1=5.67; further, p=0.8 and 5.67 > 0.8, and thus, satisfies the requirement that the formula 2.8xexax (k-a)/kj < 0.1 > p. Through tests, the strength of the battery weld joint 3 meets the requirement, no air leakage exists under 0.8MPa, and the explosion-proof valve can be normally opened.
As can be seen from table 4, in example 37, k=10, e=60, a=0.486, and thus, 2.8×e×a× (k-a)/k-0.1=7.67; further, p=0.8 and 7.67 > 0.8, and thus, satisfies the requirement that the formula 2.8xexax (k-a)/kj < 0.1 > p. Through tests, the strength of the battery weld joint 3 meets the requirement, no air leakage exists under 0.8MPa, and the explosion-proof valve can be normally opened.
As can be seen from table 4, in example 38, k=10, e=60, a= 0.631, and thus, 2.8×e×a× (k-a)/k-0.1=9.83; further, p=0.8 and 9.83 > 0.8, and thus, satisfies the requirement that the formula 2.8xexax (k-a)/kj < 0.1 > p. Through tests, the strength of the battery weld joint 3 meets the requirement, no air leakage exists under 0.8MPa, and the explosion-proof valve can be normally opened.
As can be seen from table 4, in example 39, k=10, e=60, a=0.812, and thus, 2.8×e×a× (k-a)/k-0.1=12.43; further, p=0.8 and 12.43 > 0.8, and thus, satisfies the requirement that the formula 2.8xexax (k-a)/kj-0.1. Gtoreq.p. Through tests, the strength of the battery weld joint 3 meets the requirement, no air leakage exists under 0.8MPa, and the explosion-proof valve can be normally opened.
As can be seen from table 4, in example 40, k=10, e=60, a=1, and thus, 2.8×e×a× (k-a)/k-0.1=15.02; further, p=0.8 and 15.02 > 0.8, and thus, satisfies the requirement that the formula 2.8xexax (k-a)/kj < 0.1 > p. Through tests, the strength of the battery weld joint 3 meets the requirement, no air leakage exists under 0.8MPa, and the explosion-proof valve can be normally opened.
As can be seen from table 4, in example 41, k=10, e=30, a=0.12, and thus, 2.8×e×a× (k-a)/k-0.1=0.9; further, p=0.8 and 0.9 > 0.8, and thus, satisfies the requirement that the formula 2.8xexax (k-a)/kj < 0.1 > p. Through tests, the strength of the battery weld joint 3 meets the requirement, no air leakage exists under 0.8MPa, and the explosion-proof valve can be normally opened.
As can be seen from table 4, in example 42, k=10, e=250, a=0.3, and thus, 2.8×e×a× (k-a)/k-0.1=20.27; further, p=0.8 and 20.27 > 0.8, and thus, satisfies the requirement that the formula 2.8xexax (k-a)/kj < 0.1 > p. Through tests, the strength of the battery weld joint 3 meets the requirement, no air leakage exists under 0.8MPa, and the explosion-proof valve can be normally opened.
As can be seen from table 4, in example 43, k=10, e=450, a=0.305, and thus, 2.8×e×a× (k-a)/k-0.1=37.16; further, p=0.8 and 37.16 > 0.8, and thus, satisfies the requirement that the formula 2.8xexax (k-a)/kj-0.1. Gtoreq.p. Through tests, the strength of the battery weld joint 3 meets the requirement, no air leakage exists under 0.8MPa, and the explosion-proof valve can be normally opened.
As can be seen from table 4, in example 44, k=10, e=800, a=0.311, and thus, 2.8×e×a× (k-a)/k-0.1=67.4; further, p=1.4 and 67.4 > 1.4, and thus, satisfies the requirement that the formula 2.8xexax (k-a)/kj < 0.1 > p. Through tests, the strength of the battery weld joint 3 meets the requirement, no air leakage exists under 1.4MPa, and the explosion-proof valve can be normally opened.
As can be seen from table 4, in example 45, k=10, e=1500, a=0.315, and thus, 2.8×e×a× (k-a)/k-0.1=128; further, p=2.2 and 128 > 2.2, and thus, satisfies the requirement that the formula 2.8xexax (k-a)/kj-0.1. Gtoreq.p. Through tests, the strength of the battery weld joint 3 meets the requirement, no air leakage exists under 2.2MPa, and the explosion-proof valve can be normally opened.
As can be seen from table 4, in example 46, k=10, e=2500, a=0.325, and thus, 2.8×e×a× (k-a)/k-0.1=220; further, p=2.6 and 220 > 2.6, and thus, satisfies the requirement that the formula 2.8xexax (k-a)/kj-0.1. Gtoreq.p. Through tests, the strength of the battery weld joint 3 meets the requirement, no air leakage exists under 2.6MPa, and the explosion-proof valve can be normally opened.
As can be seen from table 4, in comparative example 7, k=10, e=60, a=0.045, and thus, 2.8×e×a× (k-a)/k-0.1=0.65; further, p=0.8, and 0.65 < 0.8, i.e., 2.8×e×a× (k-a)/k-0.1 < p, does not satisfy the requirement that the formula 2.8×e×a× (k-a)/k, k-0.1. Gtoreq.p. Through tests, the strength of the battery weld joint 3 does not meet the requirement, and the weld joint 3 is damaged and air leaks before the explosion-proof valve is opened.
As can be seen from table 4, in comparative example 8, k=10, e=25, a=0.12, and thus, 2.8×e×a× (k-a)/k-0.1=0.73; further, p=0.8, and 0.73 < 0.8, i.e., 2.8×e×a× (k-a)/k-0.1 < p, does not satisfy the requirement that the formula 2.8×e×a× (k-a)/k, k-0.1. Gtoreq.p. Through tests, the tensile strength of the battery shell is lower, the strength of the welding line 3 does not meet the requirement, and the welding line 3 is damaged and air leaks before the explosion-proof valve is opened.
The weld 3 strength and the air tightness of the different cells were tested below, and the test results of the examples and comparative examples in which k=100 mm are shown in table 5. Wherein, the examples refer to the batteries satisfying the formula 2.8XeXaXX (k-a)/kN-0.1. Gtoreq.p as presented in the present examples, and the comparative examples are the batteries not satisfying the formula 2.8XeXaX (k-a)/kN-0.1. Gtoreq.p as presented in the present examples.
Table 5 test results of examples and comparative examples
As can be seen from table 5, in example 47, k=100, e=300, a=0.1, and thus, 2.8×e×a× (k-a)/k-0.1=0.74; further, p=0.7 and 0.74 > 0.7, and thus, satisfies the requirement that the formula 2.8xexax (k-a)/kj < 0.1 > p. Through tests, the strength of the battery weld joint 3 meets the requirement, no air leakage exists under 0.7MPa, and the explosion-proof valve can be normally opened.
As can be seen from table 5, in example 48, k=100, e=300, a=0.251, and thus, 2.8×e×a× (k-a)/k-0.1=2; further, p=0.6 and 2 > 0.6, and thus, the requirement that the formula 2.8xexax (k-a)/kj-0.1. Gtoreq.p is satisfied. Through tests, the strength of the battery weld joint 3 meets the requirement, no air leakage exists under 0.6MPa, and the explosion-proof valve can be normally opened.
As can be seen from table 5, in example 49, k=100, e=300, a=0.341, and thus, 2.8×e×a× (k-a)/k-0.1=2.75; further, p=0.7 and 2.75 > 0.7, and thus, satisfies the requirement that the formula 2.8xexax (k-a)/kj < 0.1 > p. Through tests, the strength of the battery weld joint 3 meets the requirement, no air leakage exists under 0.7MPa, and the explosion-proof valve can be normally opened.
As can be seen from table 5, in example 50, k=100, e=300, a= 0.481, and thus, 2.8×e×a× (k-a)/k-0.1=3.92; further, p=0.7 and 3.92 > 0.7, and thus, satisfies the requirement that the formula 2.8xexax (k-a)/kj-0.1. Gtoreq.p. Through tests, the strength of the battery weld joint 3 meets the requirement, no air leakage exists under 0.7MPa, and the explosion-proof valve can be normally opened.
As can be seen from table 5, in example 51, k=100, e=300, a=0.612, and thus, 2.8×e×a× (k-a)/k-0.1=5.01; further, p=0.7 and 5.01 > 0.7, and thus, satisfies the requirement that the formula 2.8xexax (k-a)/kj-0.1. Gtoreq.p. Through tests, the strength of the battery weld joint 3 meets the requirement, no air leakage exists under 0.7MPa, and the explosion-proof valve can be normally opened.
As can be seen from table 5, in example 52, k=100, e=300, a=0.834, thus 2.8×e×a× (k-a)/k-0.1=6.85; further, p=0.7 and 6.85 > 0.7, and thus, satisfies the requirement that the formula 2.8xexax (k-a)/kj-0.1. Gtoreq.p. Through tests, the strength of the battery weld joint 3 meets the requirement, no air leakage exists under 0.7MPa, and the explosion-proof valve can be normally opened.
As can be seen from table 5, in example 53, k=100, e=300, a=1, and thus, 2.8×e×a× (k-a)/k-0.1=8.22; further, p=0.7 and 8.22 > 0.7, and thus, satisfies the requirement that the formula 2.8xexax (k-a)/kj < 0.1 > p. Through tests, the strength of the battery weld joint 3 meets the requirement, no air leakage exists under 0.7MPa, and the explosion-proof valve can be normally opened.
As can be seen from table 5, in example 54, k=100, e=30, a=0.986, and thus, 2.8×e×a× (k-a)/k-0.1=0.72; further, p=0.7 and 0.72 > 0.7, and thus, satisfies the requirement that the formula 2.8xexax (k-a)/kj-0.1. Gtoreq.p. Through tests, the strength of the battery weld joint 3 meets the requirement, no air leakage exists under 0.7MPa, and the explosion-proof valve can be normally opened.
As can be seen from table 5, in example 55, k=100, e=150, a=0.3, and thus, 2.8×e×a× (k-a)/k-0.1=1.16; further, p=0.7 and 1.16 > 0.7, and thus, satisfies the requirement that the formula 2.8xexax (k-a)/kj < 0.1 > p. Through tests, the strength of the battery weld joint 3 meets the requirement, no air leakage exists under 0.7MPa, and the explosion-proof valve can be normally opened.
As can be seen from table 5, in example 56, k=100, e=500, a=0.305, and thus, 2.8×e×a× (k-a)/k-0.1=4.16; further, p=0.8 and 4.16 > 0.8, and thus, satisfies the requirement that the formula 2.8xexax (k-a)/kj < 0.1 > p. Through tests, the strength of the battery weld joint 3 meets the requirement, no air leakage exists under 0.8MPa, and the explosion-proof valve can be normally opened.
As can be seen from table 5, in example 57, k=100, e=800, a=0.302, and thus, 2.8×e×a× (k-a)/k-0.1=6.64; further, p=1.5 and 6.64 > 1.5, and thus, satisfies the requirement that the formula 2.8xexax (k-a)/kj < 0.1 > p. Through tests, the strength of the battery weld joint 3 meets the requirement, no air leakage exists under 1.5MPa, and the explosion-proof valve can be normally opened.
As can be seen from table 5, in example 58, k=100, e=1500, a=0.305, and thus, 2.8×e×a× (k-a)/k-0.1=12.67; further, p=2 and 12.67 > 2, and thus, satisfies the requirement that the formula 2.8xexax (k-a)/k-0.1. Gtoreq.p. Through tests, the strength of the battery weld joint 3 meets the requirement, no air leakage exists under 2MPa, and the explosion-proof valve can be normally opened.
As can be seen from table 5, in example 59, k=100, e=2500, a=0.325, and thus, 2.8×e×a× (k-a)/k-0.1=22.58; further, p=2.6 and 22.58 > 2.6, and thus, satisfies the requirement that the formula 2.8xexax (k-a)/kj < 0.1 > p. Through tests, the strength of the battery weld joint 3 meets the requirement, no air leakage exists under 2.6MPa, and the explosion-proof valve can be normally opened.
As can be seen from table 5, in comparative example 9, k=100, e=300, a=0.086, and thus, 2.8×e×a× (k-a)/k-0.1=0.62; further, p=0.7, and 0.62 < 0.7, i.e., 2.8×e×a× (k-a)/k-0.1 < p, does not satisfy the requirement that the formula 2.8×e×a× (k-a)/k, k-0.1. Gtoreq.p. Through tests, the strength of the battery weld joint 3 does not meet the requirement, and the weld joint 3 is damaged and air leaks before the explosion-proof valve is opened.
As can be seen from table 5, in comparative example 10, k=100, e=25, a=0.896, and thus, 2.8×e×a× (k-a)/k-0.1=0.52; further, p=0.7, and 0.52 < 0.7, i.e., 2.8×e×a× (k-a)/k-0.1 < p, does not satisfy the requirement that the formula 2.8×e×a× (k-a)/k, k-0.1. Gtoreq.p. Through tests, the tensile strength of the battery shell is lower, the strength of the welding line 3 does not meet the requirement, and the welding line 3 is damaged and air leaks before the explosion-proof valve is opened.
It is worth noting that the weld joint 3 strength and the air tightness of the battery are tested, comprising the steps of: after the shell and the cover plate are welded, placing the battery in a special gauge, and carrying out helium detection by a helium detection mass spectrometer, wherein the battery leakage rate is OK if the battery leakage rate is less than or equal to 1 multiplied by 10 - 7Pa·m3/s, and the battery leakage rate is NG if the battery leakage rate is more than 1 multiplied by 10 -7Pa·m3/s; after helium detection is finished, the opening pressure of the explosion-proof valve is detected, the inside of the shell is pressurized until the explosion-proof valve is opened, obvious leakage sound can be generated if a welding line is damaged before the explosion-proof valve is opened, and meanwhile, the pressure in the shell can rise slowly or cannot rise.
According to an embodiment of the present invention, in another aspect, there is also provided a battery pack including the above battery.
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 (9)

1. A battery, comprising:
the shell is of a hollow structure with an opening;
the cover plate is arranged corresponding to the opening, the cover plate is welded with the shell to form a welding line at the joint of the cover plate and the shell, and the cover plate and the shell are enclosed to form an accommodating space;
the pole group is arranged in the accommodating space;
The diameter of the outer wall of the shell is k, the tensile strength of the shell is e, the penetration of the welding seam is a along the radial direction of the shell, the upper limit value of the opening pressure of the explosion-proof valve of the battery is p, the opening pressure of the explosion-proof valve is 2.8xxax (k-a)/k is 0.1-p, the value range of the penetration a is 100 mu m-a-1000 mu m, the value range of the diameter k of the outer wall of the shell is 10 mm-k-100 mm, the value range of the tensile strength e of the shell is 30 MPa-e 2500MPa, and the value range of the opening pressure upper limit value p of the explosion-proof valve is 0.6 MPa-p-2.6 MPa.
2. The battery according to claim 1, wherein the weld bead has a width b in the axial direction of the case, satisfying 100 μm.ltoreq.b.ltoreq.3000 μm.
3. The battery according to claim 2, wherein the cover plate is formed with a connection boss, the connection boss is arranged in abutting connection with an end face of the housing forming the opening, the thickness of the connection boss is t1, and the thickness of the connection boss is 0.1 mm-t 1-3 mm.
4. A battery according to claim 3, wherein the wall thickness of the housing is t2, satisfying 0.1mm +.t2 +.1 mm.
5. The cell of claim 3, wherein the penetration a and the thickness t1 of the connecting boss satisfy t1.gtoreq.a.
6. The cell of claim 4, wherein the penetration a and the wall thickness t2 of the housing satisfy t2 ≡a.
7. The battery according to any one of claims 1 to 6, wherein the weld forms a first projection on the outer peripheral surfaces of the case and the cover plate, and a height of the first projection in a radial direction of the case is c1, satisfying c1.ltoreq.100 μm.
8. The battery according to any one of claims 1 to 6, wherein the weld forms a second projection on a side of the cover plate away from the case, and a height of the second projection in an axial direction of the case is c2, satisfying c2.ltoreq.250 μm.
9. A battery pack comprising the battery according to any one of claims 1 to 8.
CN202410573778.5A 2024-05-10 2024-05-10 Battery and battery pack Active CN118156697B (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117559072A (en) * 2023-12-11 2024-02-13 蜂巢能源科技股份有限公司 Battery and battery pack
CN117638336A (en) * 2024-01-24 2024-03-01 蜂巢能源科技股份有限公司 Battery case and power battery

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CN117862716A (en) * 2023-12-28 2024-04-12 惠州锂威新能源科技有限公司 Welding method and battery
CN117878519B (en) * 2024-03-08 2024-05-14 蜂巢能源科技股份有限公司 Battery core

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117559072A (en) * 2023-12-11 2024-02-13 蜂巢能源科技股份有限公司 Battery and battery pack
CN117638336A (en) * 2024-01-24 2024-03-01 蜂巢能源科技股份有限公司 Battery case and power battery

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