CN117937039A - Battery cell - Google Patents
Battery cell Download PDFInfo
- Publication number
- CN117937039A CN117937039A CN202410165417.7A CN202410165417A CN117937039A CN 117937039 A CN117937039 A CN 117937039A CN 202410165417 A CN202410165417 A CN 202410165417A CN 117937039 A CN117937039 A CN 117937039A
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- China
- Prior art keywords
- battery
- equal
- explosion
- housing
- proof valve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000000463 material Substances 0.000 claims description 22
- 239000011149 active material Substances 0.000 claims description 20
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 14
- 238000013022 venting Methods 0.000 claims description 14
- 239000007787 solid Substances 0.000 claims description 11
- 229910052759 nickel Inorganic materials 0.000 claims description 10
- QSNQXZYQEIKDPU-UHFFFAOYSA-N [Li].[Fe] Chemical group [Li].[Fe] QSNQXZYQEIKDPU-UHFFFAOYSA-N 0.000 claims description 7
- DVATZODUVBMYHN-UHFFFAOYSA-K lithium;iron(2+);manganese(2+);phosphate Chemical group [Li+].[Mn+2].[Fe+2].[O-]P([O-])([O-])=O DVATZODUVBMYHN-UHFFFAOYSA-K 0.000 claims description 5
- 238000007711 solidification Methods 0.000 claims description 4
- 230000008023 solidification Effects 0.000 claims description 4
- 238000004880 explosion Methods 0.000 description 20
- 238000010586 diagram Methods 0.000 description 8
- 238000003466 welding Methods 0.000 description 8
- 230000006835 compression Effects 0.000 description 5
- 238000007906 compression Methods 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 3
- 229910001416 lithium ion Inorganic materials 0.000 description 3
- 239000000126 substance Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- CPSYWNLKRDURMG-UHFFFAOYSA-L hydron;manganese(2+);phosphate Chemical compound [Mn+2].OP([O-])([O-])=O CPSYWNLKRDURMG-UHFFFAOYSA-L 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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
- H01M50/30—Arrangements for facilitating escape of gases
- H01M50/342—Non-re-sealable arrangements
- H01M50/3425—Non-re-sealable arrangements in the form of rupturable membranes or weakened parts, e.g. pierced with the aid of a sharp member
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- 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
-
- 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
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Gas Exhaust Devices For Batteries (AREA)
Abstract
The application discloses a battery, which comprises a shell and an explosion-proof valve arranged on the shell; the shell has structural strength value A, satisfies: a=a+b+d× 9 +c×e; wherein a is the tensile strength value of the shell; b is the yield strength value of the shell; c is the compressive strength value of the shell, d is the leakage rate value of the shell; and e is the opening pressure value of the explosion-proof valve. The battery shell and the parameter index of the explosion-proof valve are combined, so that the overall structural strength of the battery can be balanced.
Description
The application is a divisional application of patent application with the application number 202311347551.0, the application date 2023, the 10 th month and the 18 th day and the name of 'a battery, a battery module and a battery pack'.
Technical Field
The application belongs to the technical field of batteries, and particularly relates to a battery.
Background
Along with the increasing maturity of lithium ion battery technology, lithium ion batteries are used as power batteries to be widely applied to electric automobiles and energy storage fields, the structural strength and the safety performance of the battery core of the lithium ion batteries are extremely important for the safe operation of the battery core, however, the structural strength and the safety performance of the conventional battery core cannot be considered, and safety accidents are easy to cause.
Disclosure of Invention
The application provides a battery, which aims to solve the problems that the cell structure of the existing battery cannot achieve both structural strength and safety performance and safety accidents are easy to cause.
The application provides a battery, which comprises a shell and an explosion-proof valve arranged on the shell; the shell has a structural strength value A, satisfying:
A＝a+b+d×109+c×e；
Wherein a is the tensile strength value of the shell; b is the yield strength value of the shell; c is the compressive strength value of the shell, d is the leak rate value of the shell; and e is the opening pressure value of the explosion-proof valve.
In some embodiments, the cracking pressure e of the explosion proof valve satisfies: e is more than or equal to 0.4MPa and less than or equal to 1.2MPa.
In some embodiments, the battery satisfies any of the following features:
g) When the active material of the battery is an iron lithium system, e is more than or equal to 0.4MPa and less than or equal to 0.8MPa;
h) When the active material of the battery is a middle nickel ternary system, e is more than or equal to 0.55MPa and less than or equal to 1.0MPa;
i) When the active material of the battery is a high-nickel ternary system, e is more than or equal to 0.7MPa and less than or equal to 1.1MPa;
j) When the active material of the battery is a sodium-electricity system, e is more than or equal to 0.8MPa and less than or equal to 1.3MPa;
k) When the active material of the battery is a lithium iron manganese phosphate system, e is more than or equal to 0.7MPa and less than or equal to 1.2MPa;
l) when the active material of the battery is a solidification state system, a semi-solid state system or an all-solid state system, e is more than or equal to 0.6MPa and less than or equal to 1.0MPa.
In some embodiments, the explosion proof valve has a venting area S that satisfies:
S＝γC；
wherein C is the capacity of the battery; gamma is the material coefficient, gamma=1.6 to 6.6.
In some embodiments, the battery satisfies any of the following features:
m) when the active material of the battery is an iron lithium system, gamma=1.6-1.8;
n) when the active material of the battery is any one of a middle-nickel ternary system, a high-nickel ternary system, a sodium-electricity system, a lithium iron manganese phosphate system, a solidification state system, a semi-solid system and an all-solid system, gamma=5.6-6.6.
In some embodiments, the leak rate d of the housing satisfies: 0.1X10 -9Pa·m3/s≤d≤100×10-9Pa·m3/s.
In some embodiments, the tensile strength a of the housing satisfies: a is more than or equal to 135MPa and less than or equal to 175MPa.
In some embodiments, the yield strength b of the housing satisfies: b is more than or equal to 125MPa and less than or equal to 200MPa.
In some embodiments, the compressive strength c of the housing satisfies: c is more than or equal to 1.2MPa and less than or equal to 2.5MPa.
In some embodiments, the housing comprises a large face, a side face connecting the large face, and a bottom face connecting the large face and the side face, the large face, the side face, and the bottom face enclosing a receiving cavity;
The ratio of the air leakage area S 1 of the explosion-proof valve to the area of the large surface, the side surface and the bottom surface to the ratio of S 2 is as follows: s 1/S2% or more and 6% or less.
The application has the beneficial effects that a battery, a shell and an explosion-proof valve arranged on the shell are provided; the shell has structural strength value A, satisfies: a=a+b+d× 9 +c×e; wherein a is the tensile strength value of the shell; b is the yield strength value of the shell; c is the compressive strength value of the shell, d is the leakage rate value of the shell; and e is the opening pressure value of the explosion-proof valve. The tensile strength refers to the maximum stress that the material can bear under the action of tensile force, and the higher the tensile strength is, the stronger the tensile failure resistance of the material is; the yield strength refers to a critical point at which plastic deformation of a material begins in the stretching process, and determines the plasticity and stability of the material; compressive strength refers to the ability of a material to resist compression when subjected to pressure, and it refers to the maximum pressure that the material can withstand, the higher the compressive strength, the greater the ability of the material to resist compression failure. The leak rate of the case means the degree of leakage of gas or liquid of the battery case under certain conditions, and is used to evaluate the sealing performance of the battery. If the sealing performance of the battery case is not good, gas or liquid inside the battery may leak out, thereby affecting the normal operation and safety of the battery. By combining the parameter indexes, the overall structural strength of the battery can be balanced.
Drawings
The technical solution and other advantageous effects of the present application will be made apparent by the following detailed description of the specific embodiments of the present application with reference to the accompanying drawings.
Fig. 1 is a schematic diagram of a housing structure of a battery according to an embodiment of the present application;
fig. 2 is a schematic diagram of a cover plate structure of a battery according to an embodiment of the present application;
fig. 3 is a schematic diagram of a state before an explosion-proof valve of a battery is opened according to an embodiment of the present application;
Fig. 4 is a schematic diagram of a state of an explosion-proof valve of a battery after opening the valve according to an embodiment of the present application;
fig. 5 is a schematic diagram showing a state of rupture of a battery case according to an embodiment of the present application;
fig. 6 is a schematic view of a housing structure of a battery according to another embodiment of the present application;
fig. 7 is a schematic diagram of a state after an explosion-proof valve of a battery is opened according to another embodiment of the present application;
fig. 8 is a schematic view of a housing structure of a battery according to another embodiment of the present application;
Fig. 9 is a schematic diagram of a state after an explosion-proof valve of a battery is opened according to another embodiment of the present application;
fig. 10 is a schematic diagram of a cover plate structure of a battery according to another embodiment of the application.
Reference numerals:
10-shell, 101-large face, 102-side face, 103-bottom face, 104-containing cavity, 11-third edge, 12-fourth edge, 20-cover plate, 21-first edge, 22-second edge, 30-explosion-proof valve.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. It will be apparent that the described embodiments are only some, but not all, embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to fall within the scope of the application.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "connected," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically connected, electrically connected or can be communicated with each other; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more features.
The following disclosure provides many different embodiments, or examples, for implementing different features of the application. In order to simplify the present disclosure, components and arrangements of specific examples are described below. They are, of course, merely examples and are not intended to limit the application.
Referring to fig. 1 and 2, an embodiment of the present application provides a battery, a case 10, the case 10 including a large face 101, a side face 102 connecting the large face 101, and a bottom face 103 connecting the large face 101 and the side face 102, the large face 101, the side face 102, and the bottom face 103 enclosing a housing chamber 104;
A cover plate 20, wherein the cover plate 20 is connected with the shell 10 and covers the accommodating cavity 104;
An explosion-proof valve 30, wherein the explosion-proof valve 30 is arranged on the cover plate 20 and/or the bottom surface 103;
The battery satisfies the following conditions: 43.7.ltoreq.A.times.S 2/100S1.ltoreq. 121.7;
Wherein A is the structural strength value of the shell 10; s 1 is the air leakage area of the explosion-proof valve 30; s 2 is the sum of the areas of the large face 101, the side face 102 and the bottom face 103.
The relief area of the explosion proof valve 30 refers to a passage area through which gas or liquid is allowed to pass when the explosion proof valve 30 is opened within a safe pressure range. The size of the venting area of the explosion proof valve 30 directly affects the venting capability of the explosion proof valve.
In a conventional state, as shown in fig. 3, when the cover plate 20 covers the accommodating chamber 104, the explosion-proof valve 30 is in a closed state. When the thermal runaway of the battery occurs, as shown in fig. 4, the explosion-proof valve 30 is opened, and the internal substances and heat are dissipated outward through the explosion-proof valve 30; when the stability of the case 10 is insufficient or heat dissipation is hindered, as shown in fig. 5, the case 10 receives an internal impact and is easily broken.
It will be appreciated that the value of (A x S 2)/100S1) may be any one or a range between any two of 43.7, 50, 60, 70, 80, 90, 100, 110, 120, 121.7. The overall structural strength of the housing 10 may affect the stability of the housing 10 when the battery cell is operated, and the greater the venting area of the explosion-proof valve 30, the easier it is to release internal substances and heat when thermal runaway or the like occurs, but may affect the stability of the housing 10. When the value of (A x S 2)/100S1) satisfies the above range, the housing 10 may not collapse in the battery cell, and the normal opening of the explosion-proof valve 30 may be ensured.
In some embodiments, the structural strength of the housing 10 is calculated from equation 1:
Formula 1: a=a+b+d× 9 +c×e;
Where a is the tensile strength value of the housing 10; b is the yield strength value of the housing 10; c is the compressive strength value of the casing 10, d is the leakage rate value of the casing 10; e is the opening pressure value of the explosion proof valve 30.
The tensile strength refers to the maximum stress that the material can bear under the action of tensile force, and the higher the tensile strength is, the stronger the tensile failure resistance of the material is; the yield strength refers to a critical point at which plastic deformation of a material begins in the stretching process, and determines the plasticity and stability of the material; compressive strength refers to the ability of a material to resist compression when subjected to pressure, and it refers to the maximum pressure that the material can withstand, the higher the compressive strength, the greater the ability of the material to resist compression failure.
The leak rate of the case 10, which refers to the degree of gas or liquid leakage of the battery case under certain conditions for evaluating the sealing performance of the battery, depends on various factors including material properties, manufacturing process, and packaging design, etc. If the sealing performance of the battery case is not good, gas or liquid inside the battery may leak out, thereby affecting the normal operation and safety of the battery.
By combining the above-described parameter indexes in the form of equation 1, the overall structural strength of the housing 10 can be evaluated appropriately.
In some embodiments, the leak rate d of the housing 10 satisfies: 0.1X10 -9Pa·m3/s≤d≤100×10-9Pa·m3/s. It is understood that the value of d (unit: pa.m 3/s) may be any one or a range between any two of 0.1×10-9、0.3×10-9、0.6×10-9、0.9×10-9、2×10-9、4×10-9、5×10-9、7×10-9、15×10-9、25×10-9、35×10-9、80×10-9、100×10-9. When d is taken to be in the above range, the battery has good sealability and safety.
In some embodiments, the opening pressure e of the explosion proof valve 30 satisfies: e is more than or equal to 0.4MPa and less than or equal to 1.2MPa. It is understood that the value of e (unit: MPa) may be any one value or a range between any two values of 0.4, 0.6, 0.8, 1.0 and 1.2.
Further, the value of e can be changed according to different active material systems in the battery, and the specific value range is as follows:
iron lithium system: 0.4-0.8 MPa;
Ternary system (medium nickel): 0.55-1.0 MPa;
Ternary system (high nickel): 0.7-1.1 MPa;
sodium-electric system: 0.8-1.3 MPa;
solid, semi-solid or all solid systems: 0.7-1.2 MPa;
Lithium iron manganese phosphate (M3P) system: 0.6-1.0 MPa.
In the whole life cycle of the battery cell, under the condition that the utilization rate of the cut-off capacity is more than or equal to 80%, the final gas production rate of 52148/54173 standard-size lithium iron is about 0.1-0.2 MPa, so that the gas production state is achieved when the battery cell reaches the service life limit, and the risk of leakage of an explosion-proof valve or a shell is avoided.
In some embodiments, the ratio f of the vent area of the explosion protection valve 30 to the area of the large face 101, the side face 102, and the bottom face 103 and S 2 satisfies: f is more than or equal to 3% and less than or equal to 6%. It is understood that the value of f may be any one of 3%, 4%, 5%, 6%, or a range between any two values.
In some embodiments, the tensile strength a of the housing 10 satisfies: 135-a-175. It is understood that the value of a (in MPa) may be any one or a range between any two of 135, 140, 145, 148, 150, 155, 160, 170, 200, 250.
In some embodiments, the yield strength b of the housing 10 satisfies: b is more than or equal to 125MPa and less than or equal to 200MPa. It is understood that the value of b (in MPa) may be any one or a range between any two of 125, 128, 130, 135, 140, 145, 148, 150, 155, 160, 170, 200.
In some embodiments, the compressive strength c of the housing 10 satisfies: c is more than or equal to 1.2MPa and less than or equal to 2.5MPa. It is understood that the value of c (unit: MPa) may be any one of 1.2, 1.3, 1.4, 1.7, 1.9, 2.1, 2.5 or a range between any two values. When the values of a, b and c respectively meet the above-mentioned value ranges, the housing 10 has a good overall strength.
In some embodiments, the venting area S of the explosion proof valve 30 satisfies the relationship shown in equation 2:
Formula 2: s=yc;
wherein C is the battery capacity; gamma is the material coefficient, gamma=1.6 to 6.6.
The venting area of the explosion protection valve 30 is closely related to the active material system in the battery cell and the battery capacity. Wherein, the material coefficient gamma changes with different materials, and is specifically as follows:
when the active material is an iron lithium system, gamma=1.6 to 1.8;
when the active material is a ternary system, and other systems: gamma=5.6 to 6.6.
In some embodiments, the cover 20 includes a first edge 21 and a second edge 22 connected to the first edge, the first edge 21 has a length greater than that of the second edge 22, and at least one explosion-proof valve 30 is disposed on the cover 20, and a shortest distance between the explosion-proof valve 30 and the first edge 21 is 5-10 mm.
In some embodiments, the bottom surface 103 includes a third edge 11 and a fourth edge 12 connected to the third edge 11, the third edge 11 having a length greater than the fourth edge 12, the bottom surface 103 having at least one explosion-proof valve 30, the shortest distance between the explosion-proof valve 30 and the third edge 11 being 5-10 mm.
Further, the number of explosion-proof valves 30 in the cells under different material systems varies based on the gas production rate of the battery cells of the different material systems.
In some embodiments, for the LFP system battery, only one explosion-proof valve 30 is required, the position is not limited to the cover plate 20 or the case 10, as shown in fig. 6, the case 10 is composed of two large faces 101 and two bottom faces 103 connecting the large faces 101, the explosion-proof valve 30 is provided on the bottom face 103 of the case 10, and when thermal runaway occurs, the explosion-proof valve 30 of the bottom face 103 is in an open valve state, as shown in fig. 7.
In some embodiments, for batteries other than LFP systems, not limited to two or more explosion proof valves 30 may be provided. As shown in fig. 8, the casing 10 is composed of two large faces 101 and two bottom faces 103 connecting the large faces 101, and two explosion-proof valves 30 are axially symmetrically provided on the bottom face 103 of the casing 10. When thermal runaway occurs, the explosion-proof valve 30 is in the valve-opened state, as shown in fig. 9.
In some embodiments, the explosion proof valve 30 is located at a central symmetrical position of the cover plate 20 or the housing 10, but is not limited to a central symmetrical position. As shown in fig. 10, an explosion-proof valve 30 is provided at one end of the top of the cap plate 20.
The explosion-proof valve 30 is stably matched with the cover plate or the shell by adopting a top welding mode (laser welding). The shortest distance is an avoidance distance, and considering factors such as welding surface width, welding eccentric tolerance, welding position stability and the like, aiming at 52148 sizes, under the condition of 0.5MPa internal air pressure, structural stability simulation (simulating the practical constraint condition of a battery cell in a module) is carried out on two states of 2-3mm shortest distance between the explosion-proof valve 30 and the first edge 21 and 5-10mm shortest distance between the explosion-proof valve 30 and the first edge 21 respectively, wherein the welding position deformation (warping 2-4 mm) of the explosion-proof valve 30 exists in a structure with an edge distance of 2-3mm, and the welding failure risk exists; in the structure with the edge distance of 5-10mm, the welding position of the explosion-proof valve 30 is small in deformation (warping is 0.3-0.5 mm), and the stability is high.
The embodiment of the application also provides a battery module, which comprises the battery.
The embodiment of the application also provides a battery pack, which comprises the battery module.
The following description is made on the pressure release channel design method provided by the application by combining specific embodiments:
Example 1
The embodiment provides a battery, specifically including:
the housing 10, as shown in fig. 1, the housing 10 includes a large surface 101, a side surface 102 connecting the large surface 101, and a bottom surface 103 connecting the large surface 101 and the side surface 102, the large surface 101, the side surface 102, and the bottom surface 103 enclosing a housing chamber 104;
The bottom surface 103 includes a third edge 11 and a fourth edge 12 connected to the third edge 11, the third edge 11 having a length greater than the fourth edge 12;
A cover 20, as shown in fig. 2, the cover 20 being connected to the housing 10 and covering the receiving chamber 104, the cover 20 having a set of longer first edges 21 and a set of shorter second edges 22;
The explosion-proof valve 30 is provided at a central symmetrical position on the housing 10 as shown in fig. 2, and the shortest distance between the explosion-proof valve 30 and the first edge 21 is 5mm.
The structural parameters of the design housing 10 are as follows:
tensile strength a=125 MPa, yield strength b=135 MPa, compressive strength c=1.2 MPa;
leak rate d=10 -10Pa·m3/s.
The parameters for designing the explosion protection valve 30 are as follows:
the opening pressure e=0.4 MPa of the explosion-proof valve 30;
The ratio f=s 1/S2 =6% of the venting area of the explosion-proof valve 30 to the surface area of the housing 10.
The overall structural strength of the housing 10 is calculated according to equation 1 as follows:
A＝a+b+d×109+c×e＝270.5；
At this time (a×s 2)/100S1 =45.08), the battery formed has a good structural strength and high safety.
Example 2
The embodiment provides a battery, specifically including:
the housing 10, as shown in fig. 1, the housing 10 includes a large surface 101, a side surface 102 connecting the large surface 101, and a bottom surface 103 connecting the large surface 101 and the side surface 102, the large surface 101, the side surface 102, and the bottom surface 103 enclosing a housing chamber 104;
The bottom surface 103 includes a third edge 11 and a fourth edge 12 connected to the third edge 11, the third edge 11 having a length greater than the fourth edge 12;
A cover 20, as shown in fig. 2, the cover 20 being connected to the housing 10 and covering the receiving chamber 104, the cover 20 having a set of longer first edges 21 and a set of shorter second edges 22;
The explosion-proof valve 30 is provided at a central symmetrical position on the housing 10 as shown in fig. 2, and the shortest distance between the explosion-proof valve 30 and the first edge 21 is 5mm.
The structural parameters of the design housing 10 are as follows:
tensile strength a=125 MPa, yield strength b=135 MPa, compressive strength c=2 MPa;
leak rate d=10 -7Pa·m3/s.
The parameters for designing the explosion protection valve 30 are as follows:
The opening pressure e=0.6 MPa of the explosion-proof valve 30;
The ratio f=s 1/S2 =4% of the venting area of the explosion-proof valve 30 to the surface area of the housing 10.
The overall structural strength of the housing 10 is calculated according to equation 1 as follows:
A＝a+b+d×109+c×e＝361.2；
At this time (a×s 2)/100S1 =90.3, the battery formed has a good structural strength and high safety.
Example 3
The embodiment provides a battery, specifically including:
The housing 10, the housing 10 includes a large surface 101, a side surface 102 connecting the large surface 101, and a bottom surface 103 connecting the large surface 101 and the side surface 102, the large surface 101, the side surface 102, and the bottom surface 103 enclosing a housing chamber 104;
The bottom surface 103 includes a third edge 11 and a fourth edge 12 connected to the third edge 11, the third edge 11 having a length greater than the fourth edge 12;
A cover plate 20, the cover plate 20 being connected to the housing 10 and covering the receiving cavity 104, the cover plate 20 having a set of longer first edges 21 and a set of shorter second edges 22;
the explosion-proof valve 30 is arranged at a central symmetrical position on the shell 10, and the shortest distance between the explosion-proof valve 30 and the first edge 21 is 5mm.
The structural parameters of the design housing 10 are as follows:
Tensile strength a=135 MPa, yield strength b=125 MPa, compressive strength c=1.2 MPa;
leak rate d=0.1×10 -9Pa·m3/s.
The parameters for designing the explosion protection valve 30 are as follows:
the opening pressure e=0.4 MPa of the explosion-proof valve 30;
the ratio f=s 1/S2 =3% of the venting area of the explosion-proof valve 30 to the surface area of the housing 10.
The overall structural strength of the housing 10 is calculated according to equation 1 as follows:
A＝a+b+d×109+c×e＝260.58；
at this time (a×s 2)/100S1 =86.86), the battery constructed has a good structural strength and high safety.
Example 4
The embodiment provides a battery, specifically including:
The housing 10, the housing 10 includes a large surface 101, a side surface 102 connecting the large surface 101, and a bottom surface 103 connecting the large surface 101 and the side surface 102, the large surface 101, the side surface 102, and the bottom surface 103 enclosing a housing chamber 104;
The bottom surface 103 includes a third edge 11 and a fourth edge 12 connected to the third edge 11, the third edge 11 having a length greater than the fourth edge 12;
A cover plate 20, the cover plate 20 being connected to the housing 10 and covering the receiving cavity 104, the cover plate 20 having a set of longer first edges 21 and a set of shorter second edges 22;
the explosion-proof valve 30 is arranged at a central symmetrical position on the bottom surface 103, and the shortest distance between the explosion-proof valve 30 and the third edge 11 is 5mm.
The structural parameters of the design housing 10 are as follows:
Tensile strength a=175 MPa, yield strength b=200 MPa, compressive strength c=2.5 MPa;
leak rate d=10 -9Pa·m3/s.
The parameters for designing the explosion protection valve 30 are as follows:
The opening pressure e=1.2 MPa of the explosion-proof valve 30;
The ratio f=s 1/S2 =6% of the venting area of the explosion-proof valve 30 to the surface area of the housing 10.
The overall structural strength of the housing 10 is calculated according to equation 1 as follows:
A＝a+b+d×109+c×e＝379；
at this time (a×s 2)/100S1 = 63.17), the battery formed has a good structural strength and high safety.
Example 5
The embodiment provides a battery, specifically including:
the housing 10, as shown in fig. 1, the housing 10 includes a large surface 101, a side surface 102 connecting the large surface 101, and a bottom surface 103 connecting the large surface 101 and the side surface 102, the large surface 101, the side surface 102, and the bottom surface 103 enclosing a housing chamber 104;
The bottom surface 103 includes a third edge 11 and a fourth edge 12 connected to the third edge 11, the third edge 11 having a length greater than the fourth edge 12;
A cover 20, as shown in fig. 2, the cover 20 being connected to the housing 10 and covering the receiving chamber 104, the cover 20 having a set of longer first edges 21 and a set of shorter second edges 22;
The explosion-proof valve 30 is provided at a central symmetrical position on the housing 10 as shown in fig. 2, and the shortest distance between the explosion-proof valve 30 and the first edge 21 is 5mm.
The structural parameters of the design housing 10 are as follows:
Tensile strength a=175 MPa, yield strength b=200 MPa, compressive strength c=2.5 MPa;
leak rate d=10 -7Pa·m3/s.
The parameters for designing the explosion protection valve 30 are as follows:
The opening pressure e=1.2 MPa of the explosion-proof valve 30;
The ratio f=s 1/S2 =4% of the venting area of the explosion-proof valve 30 to the surface area of the housing 10.
The overall structural strength of the housing 10 is calculated according to equation 1 as follows:
A＝a+b+d×109+c×e＝478；
at this time (a×s 2)/100S1 =119.5, the constructed battery has a good structural strength and high safety.
Comparative example 1
The embodiment provides a battery, specifically including:
the housing 10, as shown in fig. 1, the housing 10 includes a large surface 101, a side surface 102 connecting the large surface 101, and a bottom surface 103 connecting the large surface 101 and the side surface 102, the large surface 101, the side surface 102, and the bottom surface 103 enclosing a housing chamber 104;
The bottom surface 103 includes a third edge 11 and a fourth edge 12 connected to the third edge 11, the third edge 11 having a length greater than the fourth edge 12;
A cover 20, as shown in fig. 2, the cover 20 being connected to the housing 10 and covering the receiving chamber 104, the cover 20 having a set of longer first edges 21 and a set of shorter second edges 22;
The explosion-proof valve 30 is provided at a central symmetrical position on the housing 10 as shown in fig. 2, and the shortest distance between the explosion-proof valve 30 and the first edge 21 is 3mm.
The structural parameters of the design housing 10 are as follows:
Tensile strength a=125 MPa, yield strength b=135 MPa, compressive strength c=1.3 MPa;
leak rate d=10 -9Pa·m3/s.
The parameters for designing the explosion protection valve 30 are as follows:
The opening pressure e=1.2 MPa of the explosion-proof valve 30;
The ratio f=s 1/S2 =8% of the venting area of the explosion-proof valve 30 to the surface area of the housing 10.
The overall structural strength of the housing 10 is calculated according to equation 1 as follows:
A＝a+b+d×109+c×e＝261.56；
at this time (a×s 2)/100S1 =32.7, less than the lower limit of the formula), the explosion-proof valve is excessively large in duty ratio, the edge distance is less than 5mm, the problem of low strength of the battery cell occurs, and the large-surface compression explosion-proof valve of the battery cell is compressed and tilted.
Comparative example 2
The embodiment provides a battery, specifically including:
the housing 10, as shown in fig. 1, the housing 10 includes a large surface 101, a side surface 102 connecting the large surface 101, and a bottom surface 103 connecting the large surface 101 and the side surface 102, the large surface 101, the side surface 102, and the bottom surface 103 enclosing a housing chamber 104;
The bottom surface 103 includes a third edge 11 and a fourth edge 12 connected to the third edge 11, the third edge 11 having a length greater than the fourth edge 12;
A cover 20, as shown in fig. 2, the cover 20 being connected to the housing 10 and covering the receiving chamber 104, the cover 20 having a set of longer first edges 21 and a set of shorter second edges 22;
The explosion-proof valve 30 is provided at a central symmetrical position on the housing 10 as shown in fig. 2, and the shortest distance between the explosion-proof valve 30 and the first edge 21 is 5mm.
The structural parameters of the design housing 10 are as follows:
tensile strength a=125 MPa, yield strength b=135 MPa, compressive strength c=2.5 MPa;
leak rate d=10 -7Pa·m3/s.
The parameters for designing the explosion protection valve 30 are as follows:
The opening pressure e=1.2 MPa of the explosion-proof valve 30;
The ratio f=s 1/S2 =2% of the venting area of the explosion-proof valve 30 to the surface area of the housing 10.
The overall structural strength of the housing 10 is calculated according to equation 1 as follows:
A＝a+b+d×109+c×e＝463；
At this time (a×s 2)/100S1 =231.5, this value is greater than the formula upper limit value the explosion-proof valve is too low in duty ratio, and the explosion-proof valve cannot timely discharge the product when exhausting, resulting in tearing of the casing and ejection of the pole group (pole piece).
The cell design parameters and the design results of examples 1 to 5 and comparative examples 1 to 2 are shown in table 1.
TABLE 1
According to the design parameters and the design results of the embodiments 1 to 5 and the comparative examples 1 to 2 in table 1, it can be seen that the design parameters of the battery are designed by using the scheme provided by the application, so that the battery cell can be ensured not to collapse in the operation process of the housing 10, the explosion-proof valve 30 can be ensured to be normally opened, the housing 10 is prevented from being torn, and meanwhile, the structural strength and the safety performance of the battery cell are both considered.
The battery, the battery module and the battery pack provided by the embodiment of the application are described in detail, and the application applies specific examples to explain the principle and the implementation mode of the application, and the description of the above embodiments is only used for helping to understand the technical scheme and the core idea of the application; those of ordinary skill in the art will appreciate that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application.
Claims (10)
1. A battery, comprising a housing and an explosion-proof valve disposed on the housing; the shell has a structural strength value A, satisfying:
A＝a+b+d×109+c×e；
Wherein a is the tensile strength value of the shell; b is the yield strength value of the shell; c is the compressive strength value of the shell, d is the leak rate value of the shell; and e is the opening pressure value of the explosion-proof valve.
2. A battery according to claim 1, wherein the opening pressure e of the explosion-proof valve satisfies: e is more than or equal to 0.4MPa and less than or equal to 1.2MPa.
3. A battery according to claim 2, wherein the battery meets any of the following characteristics:
g) When the active material of the battery is an iron lithium system, e is more than or equal to 0.4MPa and less than or equal to 0.8MPa;
h) When the active material of the battery is a middle nickel ternary system, e is more than or equal to 0.55MPa and less than or equal to 1.0MPa;
i) When the active material of the battery is a high-nickel ternary system, e is more than or equal to 0.7MPa and less than or equal to 1.1MPa;
j) When the active material of the battery is a sodium-electricity system, e is more than or equal to 0.8MPa and less than or equal to 1.3MPa;
k) When the active material of the battery is a lithium iron manganese phosphate system, e is more than or equal to 0.7MPa and less than or equal to 1.2MPa;
l) when the active material of the battery is a solidification state system, a semi-solid state system or an all-solid state system, e is more than or equal to 0.6MPa and less than or equal to 1.0MPa.
4. A battery according to claim 3, wherein the explosion-proof valve has a venting area S that satisfies:
S＝γC；
wherein C is the capacity of the battery; gamma is the material coefficient, gamma=1.6 to 6.6.
5. The battery of claim 4, wherein the battery meets any of the following characteristics:
m) when the active material of the battery is an iron lithium system, gamma=1.6-1.8;
n) when the active material of the battery is any one of a middle-nickel ternary system, a high-nickel ternary system, a sodium-electricity system, a lithium iron manganese phosphate system, a solidification state system, a semi-solid system and an all-solid system, gamma=5.6-6.6.
6. A battery according to claim 1, wherein the leakage rate d of the casing satisfies: 0.1X10 -9Pa·m3/s≤d≤100×10-9Pa·m3/s.
7. A battery according to claim 1, wherein the tensile strength a of the casing satisfies: a is more than or equal to 135MPa and less than or equal to 175MPa.
8. A battery according to claim 1, wherein the yield strength b of the housing satisfies: b is more than or equal to 125MPa and less than or equal to 200MPa.
9. A battery according to claim 1, wherein the compressive strength c of the casing satisfies: c is more than or equal to 1.2MPa and less than or equal to 2.5MPa.
10. A battery according to claim 1, wherein the housing comprises a large face, a side face connecting the large face and/or a bottom face connecting the large face, the side face and/or the bottom face enclosing a receiving cavity.
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| CN202311347551.0A CN117096543B (en) | 2023-10-18 | 2023-10-18 | Battery, battery module and battery pack |
| CN202410165417.7A CN117937039A (en) | 2023-10-18 | 2023-10-18 | Battery cell |
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| CN117374508B (en) * | 2023-12-07 | 2024-03-01 | 蜂巢能源科技股份有限公司 | Battery and battery pack |
| CN117438655A (en) * | 2023-12-20 | 2024-01-23 | 宁德时代新能源科技股份有限公司 | Battery cell, battery and electricity utilization device |
| CN117638394B (en) * | 2024-01-25 | 2024-04-12 | 蜂巢能源科技股份有限公司 | Single battery and battery pack |
| CN117712612A (en) * | 2024-02-04 | 2024-03-15 | 蜂巢能源科技股份有限公司 | Battery cell |
| CN117748049A (en) * | 2024-02-06 | 2024-03-22 | 蜂巢能源科技股份有限公司 | Explosion-proof valve and battery |
| CN118693418A (en) * | 2024-08-26 | 2024-09-24 | 蜂巢能源科技股份有限公司 | Battery cover plate and battery |
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| JP5872256B2 (en) * | 2011-11-11 | 2016-03-01 | 株式会社Uacj | Aluminum alloy sheet for lithium ion battery sealing material and method for producing the same |
| JP5806641B2 (en) * | 2012-05-22 | 2015-11-10 | 株式会社神戸製鋼所 | Method for forming explosion-proof valve for battery case lid |
| JP2014022129A (en) * | 2012-07-17 | 2014-02-03 | Shin Kobe Electric Mach Co Ltd | Lithium ion battery |
| JP6991748B2 (en) * | 2017-06-27 | 2022-02-03 | 三洋電機株式会社 | Battery module |
| CN111446388A (en) * | 2020-04-20 | 2020-07-24 | 欣旺达电动汽车电池有限公司 | Battery top cap subassembly and battery cell |
| CN213878326U (en) * | 2020-09-27 | 2021-08-03 | 欣旺达电动汽车电池有限公司 | Single battery and power battery |
| CN115832596A (en) * | 2021-10-19 | 2023-03-21 | 宁德时代新能源科技股份有限公司 | Battery monomer |
| CN216120517U (en) * | 2021-10-29 | 2022-03-22 | 蜂巢能源科技有限公司 | Battery shell and battery with same |
| CN217426914U (en) * | 2022-03-18 | 2022-09-13 | 蜂巢能源科技股份有限公司 | Battery core, battery module and battery pack |
| CN218274965U (en) * | 2022-06-13 | 2023-01-10 | 欣旺达惠州动力新能源有限公司 | Battery and battery module |
| CN217655975U (en) * | 2022-06-17 | 2022-10-25 | 蜂巢能源科技股份有限公司 | Battery cell, battery module and vehicle |
| CN219017847U (en) * | 2022-12-12 | 2023-05-12 | 厦门海辰储能科技股份有限公司 | Battery, battery pack and electric equipment |
| CN219371261U (en) * | 2023-03-22 | 2023-07-18 | 中创新航科技集团股份有限公司 | Battery cell |
| CN219419224U (en) * | 2023-03-29 | 2023-07-25 | 江苏正力新能电池技术有限公司 | Battery, battery module and power utilization device |
| CN116613459A (en) * | 2023-06-28 | 2023-08-18 | 蜂巢能源科技股份有限公司 | Battery and battery pack |
| CN116706416B (en) * | 2023-08-07 | 2023-10-13 | 蜂巢能源科技股份有限公司 | Power battery and battery pack |
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